1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71
72 #include "nfs4trace.h"
73
74 #define NFSDBG_FACILITY NFSDBG_PROC
75
76 #define NFS4_BITMASK_SZ 3
77
78 #define NFS4_POLL_RETRY_MIN (HZ/10)
79 #define NFS4_POLL_RETRY_MAX (15*HZ)
80
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 | ATTR_UID \
84 | ATTR_GID \
85 | ATTR_SIZE \
86 | ATTR_ATIME \
87 | ATTR_MTIME \
88 | ATTR_CTIME \
89 | ATTR_ATIME_SET \
90 | ATTR_MTIME_SET)
91
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 struct nfs_fattr *fattr, struct inode *inode);
98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
99 struct nfs_fattr *fattr, struct iattr *sattr,
100 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 const struct cred *cred,
104 struct nfs4_slot *slot,
105 bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, const nfs4_stateid *,
107 const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
109 const struct cred *, bool);
110 #endif
111
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
115 struct iattr *sattr, struct nfs4_label *label)
116 {
117 int err;
118
119 if (label == NULL)
120 return NULL;
121
122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
123 return NULL;
124
125 label->lfs = 0;
126 label->pi = 0;
127 label->len = 0;
128 label->label = NULL;
129
130 err = security_dentry_init_security(dentry, sattr->ia_mode,
131 &dentry->d_name, NULL,
132 (void **)&label->label, &label->len);
133 if (err == 0)
134 return label;
135
136 return NULL;
137 }
138 static inline void
nfs4_label_release_security(struct nfs4_label * label)139 nfs4_label_release_security(struct nfs4_label *label)
140 {
141 if (label)
142 security_release_secctx(label->label, label->len);
143 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
145 {
146 if (label)
147 return server->attr_bitmask;
148
149 return server->attr_bitmask_nl;
150 }
151 #else
152 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
154 struct iattr *sattr, struct nfs4_label *l)
155 { return NULL; }
156 static inline void
nfs4_label_release_security(struct nfs4_label * label)157 nfs4_label_release_security(struct nfs4_label *label)
158 { return; }
159 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
161 { return server->attr_bitmask; }
162 #endif
163
164 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)165 static int nfs4_map_errors(int err)
166 {
167 if (err >= -1000)
168 return err;
169 switch (err) {
170 case -NFS4ERR_RESOURCE:
171 case -NFS4ERR_LAYOUTTRYLATER:
172 case -NFS4ERR_RECALLCONFLICT:
173 case -NFS4ERR_RETURNCONFLICT:
174 return -EREMOTEIO;
175 case -NFS4ERR_WRONGSEC:
176 case -NFS4ERR_WRONG_CRED:
177 return -EPERM;
178 case -NFS4ERR_BADOWNER:
179 case -NFS4ERR_BADNAME:
180 return -EINVAL;
181 case -NFS4ERR_SHARE_DENIED:
182 return -EACCES;
183 case -NFS4ERR_MINOR_VERS_MISMATCH:
184 return -EPROTONOSUPPORT;
185 case -NFS4ERR_FILE_OPEN:
186 return -EBUSY;
187 case -NFS4ERR_NOT_SAME:
188 return -ENOTSYNC;
189 default:
190 dprintk("%s could not handle NFSv4 error %d\n",
191 __func__, -err);
192 break;
193 }
194 return -EIO;
195 }
196
197 /*
198 * This is our standard bitmap for GETATTR requests.
199 */
200 const u32 nfs4_fattr_bitmap[3] = {
201 FATTR4_WORD0_TYPE
202 | FATTR4_WORD0_CHANGE
203 | FATTR4_WORD0_SIZE
204 | FATTR4_WORD0_FSID
205 | FATTR4_WORD0_FILEID,
206 FATTR4_WORD1_MODE
207 | FATTR4_WORD1_NUMLINKS
208 | FATTR4_WORD1_OWNER
209 | FATTR4_WORD1_OWNER_GROUP
210 | FATTR4_WORD1_RAWDEV
211 | FATTR4_WORD1_SPACE_USED
212 | FATTR4_WORD1_TIME_ACCESS
213 | FATTR4_WORD1_TIME_METADATA
214 | FATTR4_WORD1_TIME_MODIFY
215 | FATTR4_WORD1_MOUNTED_ON_FILEID,
216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
217 FATTR4_WORD2_SECURITY_LABEL
218 #endif
219 };
220
221 static const u32 nfs4_pnfs_open_bitmap[3] = {
222 FATTR4_WORD0_TYPE
223 | FATTR4_WORD0_CHANGE
224 | FATTR4_WORD0_SIZE
225 | FATTR4_WORD0_FSID
226 | FATTR4_WORD0_FILEID,
227 FATTR4_WORD1_MODE
228 | FATTR4_WORD1_NUMLINKS
229 | FATTR4_WORD1_OWNER
230 | FATTR4_WORD1_OWNER_GROUP
231 | FATTR4_WORD1_RAWDEV
232 | FATTR4_WORD1_SPACE_USED
233 | FATTR4_WORD1_TIME_ACCESS
234 | FATTR4_WORD1_TIME_METADATA
235 | FATTR4_WORD1_TIME_MODIFY,
236 FATTR4_WORD2_MDSTHRESHOLD
237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
238 | FATTR4_WORD2_SECURITY_LABEL
239 #endif
240 };
241
242 static const u32 nfs4_open_noattr_bitmap[3] = {
243 FATTR4_WORD0_TYPE
244 | FATTR4_WORD0_FILEID,
245 };
246
247 const u32 nfs4_statfs_bitmap[3] = {
248 FATTR4_WORD0_FILES_AVAIL
249 | FATTR4_WORD0_FILES_FREE
250 | FATTR4_WORD0_FILES_TOTAL,
251 FATTR4_WORD1_SPACE_AVAIL
252 | FATTR4_WORD1_SPACE_FREE
253 | FATTR4_WORD1_SPACE_TOTAL
254 };
255
256 const u32 nfs4_pathconf_bitmap[3] = {
257 FATTR4_WORD0_MAXLINK
258 | FATTR4_WORD0_MAXNAME,
259 0
260 };
261
262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
263 | FATTR4_WORD0_MAXREAD
264 | FATTR4_WORD0_MAXWRITE
265 | FATTR4_WORD0_LEASE_TIME,
266 FATTR4_WORD1_TIME_DELTA
267 | FATTR4_WORD1_FS_LAYOUT_TYPES,
268 FATTR4_WORD2_LAYOUT_BLKSIZE
269 | FATTR4_WORD2_CLONE_BLKSIZE
270 | FATTR4_WORD2_CHANGE_ATTR_TYPE
271 | FATTR4_WORD2_XATTR_SUPPORT
272 };
273
274 const u32 nfs4_fs_locations_bitmap[3] = {
275 FATTR4_WORD0_CHANGE
276 | FATTR4_WORD0_SIZE
277 | FATTR4_WORD0_FSID
278 | FATTR4_WORD0_FILEID
279 | FATTR4_WORD0_FS_LOCATIONS,
280 FATTR4_WORD1_OWNER
281 | FATTR4_WORD1_OWNER_GROUP
282 | FATTR4_WORD1_RAWDEV
283 | FATTR4_WORD1_SPACE_USED
284 | FATTR4_WORD1_TIME_ACCESS
285 | FATTR4_WORD1_TIME_METADATA
286 | FATTR4_WORD1_TIME_MODIFY
287 | FATTR4_WORD1_MOUNTED_ON_FILEID,
288 };
289
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
291 struct inode *inode, unsigned long flags)
292 {
293 unsigned long cache_validity;
294
295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
296 if (!inode || !nfs_have_read_or_write_delegation(inode))
297 return;
298
299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
300
301 /* Remove the attributes over which we have full control */
302 dst[1] &= ~FATTR4_WORD1_RAWDEV;
303 if (!(cache_validity & NFS_INO_INVALID_SIZE))
304 dst[0] &= ~FATTR4_WORD0_SIZE;
305
306 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
307 dst[0] &= ~FATTR4_WORD0_CHANGE;
308
309 if (!(cache_validity & NFS_INO_INVALID_MODE))
310 dst[1] &= ~FATTR4_WORD1_MODE;
311 if (!(cache_validity & NFS_INO_INVALID_OTHER))
312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
313
314 if (nfs_have_delegated_mtime(inode)) {
315 if (!(cache_validity & NFS_INO_INVALID_ATIME))
316 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
317 if (!(cache_validity & NFS_INO_INVALID_MTIME))
318 dst[1] &= ~FATTR4_WORD1_TIME_MODIFY;
319 if (!(cache_validity & NFS_INO_INVALID_CTIME))
320 dst[1] &= ~FATTR4_WORD1_TIME_METADATA;
321 } else if (nfs_have_delegated_atime(inode)) {
322 if (!(cache_validity & NFS_INO_INVALID_ATIME))
323 dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
324 }
325 }
326
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)327 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
328 struct nfs4_readdir_arg *readdir)
329 {
330 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
331 __be32 *start, *p;
332
333 if (cookie > 2) {
334 readdir->cookie = cookie;
335 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
336 return;
337 }
338
339 readdir->cookie = 0;
340 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
341 if (cookie == 2)
342 return;
343
344 /*
345 * NFSv4 servers do not return entries for '.' and '..'
346 * Therefore, we fake these entries here. We let '.'
347 * have cookie 0 and '..' have cookie 1. Note that
348 * when talking to the server, we always send cookie 0
349 * instead of 1 or 2.
350 */
351 start = p = kmap_atomic(*readdir->pages);
352
353 if (cookie == 0) {
354 *p++ = xdr_one; /* next */
355 *p++ = xdr_zero; /* cookie, first word */
356 *p++ = xdr_one; /* cookie, second word */
357 *p++ = xdr_one; /* entry len */
358 memcpy(p, ".\0\0\0", 4); /* entry */
359 p++;
360 *p++ = xdr_one; /* bitmap length */
361 *p++ = htonl(attrs); /* bitmap */
362 *p++ = htonl(12); /* attribute buffer length */
363 *p++ = htonl(NF4DIR);
364 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
365 }
366
367 *p++ = xdr_one; /* next */
368 *p++ = xdr_zero; /* cookie, first word */
369 *p++ = xdr_two; /* cookie, second word */
370 *p++ = xdr_two; /* entry len */
371 memcpy(p, "..\0\0", 4); /* entry */
372 p++;
373 *p++ = xdr_one; /* bitmap length */
374 *p++ = htonl(attrs); /* bitmap */
375 *p++ = htonl(12); /* attribute buffer length */
376 *p++ = htonl(NF4DIR);
377 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
378
379 readdir->pgbase = (char *)p - (char *)start;
380 readdir->count -= readdir->pgbase;
381 kunmap_atomic(start);
382 }
383
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)384 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
385 {
386 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
387 fattr->pre_change_attr = version;
388 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
389 }
390 }
391
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)392 static void nfs4_test_and_free_stateid(struct nfs_server *server,
393 nfs4_stateid *stateid,
394 const struct cred *cred)
395 {
396 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
397
398 ops->test_and_free_expired(server, stateid, cred);
399 }
400
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)401 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
402 nfs4_stateid *stateid,
403 const struct cred *cred)
404 {
405 stateid->type = NFS4_REVOKED_STATEID_TYPE;
406 nfs4_test_and_free_stateid(server, stateid, cred);
407 }
408
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)409 static void nfs4_free_revoked_stateid(struct nfs_server *server,
410 const nfs4_stateid *stateid,
411 const struct cred *cred)
412 {
413 nfs4_stateid tmp;
414
415 nfs4_stateid_copy(&tmp, stateid);
416 __nfs4_free_revoked_stateid(server, &tmp, cred);
417 }
418
nfs4_update_delay(long * timeout)419 static long nfs4_update_delay(long *timeout)
420 {
421 long ret;
422 if (!timeout)
423 return NFS4_POLL_RETRY_MAX;
424 if (*timeout <= 0)
425 *timeout = NFS4_POLL_RETRY_MIN;
426 if (*timeout > NFS4_POLL_RETRY_MAX)
427 *timeout = NFS4_POLL_RETRY_MAX;
428 ret = *timeout;
429 *timeout <<= 1;
430 return ret;
431 }
432
nfs4_delay_killable(long * timeout)433 static int nfs4_delay_killable(long *timeout)
434 {
435 might_sleep();
436
437 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
438 schedule_timeout(nfs4_update_delay(timeout));
439 if (!__fatal_signal_pending(current))
440 return 0;
441 return -EINTR;
442 }
443
nfs4_delay_interruptible(long * timeout)444 static int nfs4_delay_interruptible(long *timeout)
445 {
446 might_sleep();
447
448 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
449 schedule_timeout(nfs4_update_delay(timeout));
450 if (!signal_pending(current))
451 return 0;
452 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
453 }
454
nfs4_delay(long * timeout,bool interruptible)455 static int nfs4_delay(long *timeout, bool interruptible)
456 {
457 if (interruptible)
458 return nfs4_delay_interruptible(timeout);
459 return nfs4_delay_killable(timeout);
460 }
461
462 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)463 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
464 {
465 if (!stateid)
466 return NULL;
467 switch (stateid->type) {
468 case NFS4_OPEN_STATEID_TYPE:
469 case NFS4_LOCK_STATEID_TYPE:
470 case NFS4_DELEGATION_STATEID_TYPE:
471 return stateid;
472 default:
473 break;
474 }
475 return NULL;
476 }
477
478 /* This is the error handling routine for processes that are allowed
479 * to sleep.
480 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)481 static int nfs4_do_handle_exception(struct nfs_server *server,
482 int errorcode, struct nfs4_exception *exception)
483 {
484 struct nfs_client *clp = server->nfs_client;
485 struct nfs4_state *state = exception->state;
486 const nfs4_stateid *stateid;
487 struct inode *inode = exception->inode;
488 int ret = errorcode;
489
490 exception->delay = 0;
491 exception->recovering = 0;
492 exception->retry = 0;
493
494 stateid = nfs4_recoverable_stateid(exception->stateid);
495 if (stateid == NULL && state != NULL)
496 stateid = nfs4_recoverable_stateid(&state->stateid);
497
498 switch(errorcode) {
499 case 0:
500 return 0;
501 case -NFS4ERR_BADHANDLE:
502 case -ESTALE:
503 if (inode != NULL && S_ISREG(inode->i_mode))
504 pnfs_destroy_layout(NFS_I(inode));
505 break;
506 case -NFS4ERR_DELEG_REVOKED:
507 case -NFS4ERR_ADMIN_REVOKED:
508 case -NFS4ERR_EXPIRED:
509 case -NFS4ERR_BAD_STATEID:
510 case -NFS4ERR_PARTNER_NO_AUTH:
511 if (inode != NULL && stateid != NULL) {
512 nfs_inode_find_state_and_recover(inode,
513 stateid);
514 goto wait_on_recovery;
515 }
516 fallthrough;
517 case -NFS4ERR_OPENMODE:
518 if (inode) {
519 int err;
520
521 err = nfs_async_inode_return_delegation(inode,
522 stateid);
523 if (err == 0)
524 goto wait_on_recovery;
525 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
526 exception->retry = 1;
527 break;
528 }
529 }
530 if (state == NULL)
531 break;
532 ret = nfs4_schedule_stateid_recovery(server, state);
533 if (ret < 0)
534 break;
535 goto wait_on_recovery;
536 case -NFS4ERR_STALE_STATEID:
537 case -NFS4ERR_STALE_CLIENTID:
538 nfs4_schedule_lease_recovery(clp);
539 goto wait_on_recovery;
540 case -NFS4ERR_MOVED:
541 ret = nfs4_schedule_migration_recovery(server);
542 if (ret < 0)
543 break;
544 goto wait_on_recovery;
545 case -NFS4ERR_LEASE_MOVED:
546 nfs4_schedule_lease_moved_recovery(clp);
547 goto wait_on_recovery;
548 #if defined(CONFIG_NFS_V4_1)
549 case -NFS4ERR_BADSESSION:
550 case -NFS4ERR_BADSLOT:
551 case -NFS4ERR_BAD_HIGH_SLOT:
552 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
553 case -NFS4ERR_DEADSESSION:
554 case -NFS4ERR_SEQ_FALSE_RETRY:
555 case -NFS4ERR_SEQ_MISORDERED:
556 /* Handled in nfs41_sequence_process() */
557 goto wait_on_recovery;
558 #endif /* defined(CONFIG_NFS_V4_1) */
559 case -NFS4ERR_FILE_OPEN:
560 if (exception->timeout > HZ) {
561 /* We have retried a decent amount, time to
562 * fail
563 */
564 ret = -EBUSY;
565 break;
566 }
567 fallthrough;
568 case -NFS4ERR_DELAY:
569 nfs_inc_server_stats(server, NFSIOS_DELAY);
570 fallthrough;
571 case -NFS4ERR_GRACE:
572 case -NFS4ERR_LAYOUTTRYLATER:
573 case -NFS4ERR_RECALLCONFLICT:
574 case -NFS4ERR_RETURNCONFLICT:
575 exception->delay = 1;
576 return 0;
577
578 case -NFS4ERR_RETRY_UNCACHED_REP:
579 case -NFS4ERR_OLD_STATEID:
580 exception->retry = 1;
581 break;
582 case -NFS4ERR_BADOWNER:
583 /* The following works around a Linux server bug! */
584 case -NFS4ERR_BADNAME:
585 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
586 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
587 exception->retry = 1;
588 printk(KERN_WARNING "NFS: v4 server %s "
589 "does not accept raw "
590 "uid/gids. "
591 "Reenabling the idmapper.\n",
592 server->nfs_client->cl_hostname);
593 }
594 }
595 /* We failed to handle the error */
596 return nfs4_map_errors(ret);
597 wait_on_recovery:
598 exception->recovering = 1;
599 return 0;
600 }
601
602 /*
603 * Track the number of NFS4ERR_DELAY related retransmissions and return
604 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
605 * set by 'nfs_delay_retrans'.
606 */
nfs4_exception_should_retrans(const struct nfs_server * server,struct nfs4_exception * exception)607 static int nfs4_exception_should_retrans(const struct nfs_server *server,
608 struct nfs4_exception *exception)
609 {
610 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
611 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
612 return -EAGAIN;
613 }
614 return 0;
615 }
616
617 /* This is the error handling routine for processes that are allowed
618 * to sleep.
619 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)620 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
621 {
622 struct nfs_client *clp = server->nfs_client;
623 int ret;
624
625 ret = nfs4_do_handle_exception(server, errorcode, exception);
626 if (exception->delay) {
627 int ret2 = nfs4_exception_should_retrans(server, exception);
628 if (ret2 < 0) {
629 exception->retry = 0;
630 return ret2;
631 }
632 ret = nfs4_delay(&exception->timeout,
633 exception->interruptible);
634 goto out_retry;
635 }
636 if (exception->recovering) {
637 if (exception->task_is_privileged)
638 return -EDEADLOCK;
639 ret = nfs4_wait_clnt_recover(clp);
640 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
641 return -EIO;
642 goto out_retry;
643 }
644 return ret;
645 out_retry:
646 if (ret == 0)
647 exception->retry = 1;
648 return ret;
649 }
650
651 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)652 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
653 int errorcode, struct nfs4_exception *exception)
654 {
655 struct nfs_client *clp = server->nfs_client;
656 int ret;
657
658 ret = nfs4_do_handle_exception(server, errorcode, exception);
659 if (exception->delay) {
660 int ret2 = nfs4_exception_should_retrans(server, exception);
661 if (ret2 < 0) {
662 exception->retry = 0;
663 return ret2;
664 }
665 rpc_delay(task, nfs4_update_delay(&exception->timeout));
666 goto out_retry;
667 }
668 if (exception->recovering) {
669 if (exception->task_is_privileged)
670 return -EDEADLOCK;
671 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
672 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
673 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
674 goto out_retry;
675 }
676 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
677 ret = -EIO;
678 return ret;
679 out_retry:
680 if (ret == 0) {
681 exception->retry = 1;
682 /*
683 * For NFS4ERR_MOVED, the client transport will need to
684 * be recomputed after migration recovery has completed.
685 */
686 if (errorcode == -NFS4ERR_MOVED)
687 rpc_task_release_transport(task);
688 }
689 return ret;
690 }
691
692 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)693 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
694 struct nfs4_state *state, long *timeout)
695 {
696 struct nfs4_exception exception = {
697 .state = state,
698 };
699
700 if (task->tk_status >= 0)
701 return 0;
702 if (timeout)
703 exception.timeout = *timeout;
704 task->tk_status = nfs4_async_handle_exception(task, server,
705 task->tk_status,
706 &exception);
707 if (exception.delay && timeout)
708 *timeout = exception.timeout;
709 if (exception.retry)
710 return -EAGAIN;
711 return 0;
712 }
713
714 /*
715 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
716 * or 'false' otherwise.
717 */
_nfs4_is_integrity_protected(struct nfs_client * clp)718 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
719 {
720 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
721 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
722 }
723
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)724 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
725 {
726 spin_lock(&clp->cl_lock);
727 if (time_before(clp->cl_last_renewal,timestamp))
728 clp->cl_last_renewal = timestamp;
729 spin_unlock(&clp->cl_lock);
730 }
731
renew_lease(const struct nfs_server * server,unsigned long timestamp)732 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
733 {
734 struct nfs_client *clp = server->nfs_client;
735
736 if (!nfs4_has_session(clp))
737 do_renew_lease(clp, timestamp);
738 }
739
740 struct nfs4_call_sync_data {
741 const struct nfs_server *seq_server;
742 struct nfs4_sequence_args *seq_args;
743 struct nfs4_sequence_res *seq_res;
744 };
745
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)746 void nfs4_init_sequence(struct nfs4_sequence_args *args,
747 struct nfs4_sequence_res *res, int cache_reply,
748 int privileged)
749 {
750 args->sa_slot = NULL;
751 args->sa_cache_this = cache_reply;
752 args->sa_privileged = privileged;
753
754 res->sr_slot = NULL;
755 }
756
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)757 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
758 {
759 struct nfs4_slot *slot = res->sr_slot;
760 struct nfs4_slot_table *tbl;
761
762 tbl = slot->table;
763 spin_lock(&tbl->slot_tbl_lock);
764 if (!nfs41_wake_and_assign_slot(tbl, slot))
765 nfs4_free_slot(tbl, slot);
766 spin_unlock(&tbl->slot_tbl_lock);
767
768 res->sr_slot = NULL;
769 }
770
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)771 static int nfs40_sequence_done(struct rpc_task *task,
772 struct nfs4_sequence_res *res)
773 {
774 if (res->sr_slot != NULL)
775 nfs40_sequence_free_slot(res);
776 return 1;
777 }
778
779 #if defined(CONFIG_NFS_V4_1)
780
nfs41_release_slot(struct nfs4_slot * slot)781 static void nfs41_release_slot(struct nfs4_slot *slot)
782 {
783 struct nfs4_session *session;
784 struct nfs4_slot_table *tbl;
785 bool send_new_highest_used_slotid = false;
786
787 if (!slot)
788 return;
789 tbl = slot->table;
790 session = tbl->session;
791
792 /* Bump the slot sequence number */
793 if (slot->seq_done)
794 slot->seq_nr++;
795 slot->seq_done = 0;
796
797 spin_lock(&tbl->slot_tbl_lock);
798 /* Be nice to the server: try to ensure that the last transmitted
799 * value for highest_user_slotid <= target_highest_slotid
800 */
801 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
802 send_new_highest_used_slotid = true;
803
804 if (nfs41_wake_and_assign_slot(tbl, slot)) {
805 send_new_highest_used_slotid = false;
806 goto out_unlock;
807 }
808 nfs4_free_slot(tbl, slot);
809
810 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
811 send_new_highest_used_slotid = false;
812 out_unlock:
813 spin_unlock(&tbl->slot_tbl_lock);
814 if (send_new_highest_used_slotid)
815 nfs41_notify_server(session->clp);
816 if (waitqueue_active(&tbl->slot_waitq))
817 wake_up_all(&tbl->slot_waitq);
818 }
819
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)820 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
821 {
822 nfs41_release_slot(res->sr_slot);
823 res->sr_slot = NULL;
824 }
825
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)826 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
827 u32 seqnr)
828 {
829 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
830 slot->seq_nr_highest_sent = seqnr;
831 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)832 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
833 {
834 nfs4_slot_sequence_record_sent(slot, seqnr);
835 slot->seq_nr_last_acked = seqnr;
836 }
837
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)838 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
839 struct nfs4_slot *slot)
840 {
841 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
842 if (!IS_ERR(task))
843 rpc_put_task_async(task);
844 }
845
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)846 static int nfs41_sequence_process(struct rpc_task *task,
847 struct nfs4_sequence_res *res)
848 {
849 struct nfs4_session *session;
850 struct nfs4_slot *slot = res->sr_slot;
851 struct nfs_client *clp;
852 int status;
853 int ret = 1;
854
855 if (slot == NULL)
856 goto out_noaction;
857 /* don't increment the sequence number if the task wasn't sent */
858 if (!RPC_WAS_SENT(task) || slot->seq_done)
859 goto out;
860
861 session = slot->table->session;
862 clp = session->clp;
863
864 trace_nfs4_sequence_done(session, res);
865
866 status = res->sr_status;
867 if (task->tk_status == -NFS4ERR_DEADSESSION)
868 status = -NFS4ERR_DEADSESSION;
869
870 /* Check the SEQUENCE operation status */
871 switch (status) {
872 case 0:
873 /* Mark this sequence number as having been acked */
874 nfs4_slot_sequence_acked(slot, slot->seq_nr);
875 /* Update the slot's sequence and clientid lease timer */
876 slot->seq_done = 1;
877 do_renew_lease(clp, res->sr_timestamp);
878 /* Check sequence flags */
879 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
880 !!slot->privileged);
881 nfs41_update_target_slotid(slot->table, slot, res);
882 break;
883 case 1:
884 /*
885 * sr_status remains 1 if an RPC level error occurred.
886 * The server may or may not have processed the sequence
887 * operation..
888 */
889 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
890 slot->seq_done = 1;
891 goto out;
892 case -NFS4ERR_DELAY:
893 /* The server detected a resend of the RPC call and
894 * returned NFS4ERR_DELAY as per Section 2.10.6.2
895 * of RFC5661.
896 */
897 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
898 __func__,
899 slot->slot_nr,
900 slot->seq_nr);
901 goto out_retry;
902 case -NFS4ERR_RETRY_UNCACHED_REP:
903 case -NFS4ERR_SEQ_FALSE_RETRY:
904 /*
905 * The server thinks we tried to replay a request.
906 * Retry the call after bumping the sequence ID.
907 */
908 nfs4_slot_sequence_acked(slot, slot->seq_nr);
909 goto retry_new_seq;
910 case -NFS4ERR_BADSLOT:
911 /*
912 * The slot id we used was probably retired. Try again
913 * using a different slot id.
914 */
915 if (slot->slot_nr < slot->table->target_highest_slotid)
916 goto session_recover;
917 goto retry_nowait;
918 case -NFS4ERR_SEQ_MISORDERED:
919 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
920 /*
921 * Were one or more calls using this slot interrupted?
922 * If the server never received the request, then our
923 * transmitted slot sequence number may be too high. However,
924 * if the server did receive the request then it might
925 * accidentally give us a reply with a mismatched operation.
926 * We can sort this out by sending a lone sequence operation
927 * to the server on the same slot.
928 */
929 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
930 slot->seq_nr--;
931 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
932 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
933 res->sr_slot = NULL;
934 }
935 goto retry_nowait;
936 }
937 /*
938 * RFC5661:
939 * A retry might be sent while the original request is
940 * still in progress on the replier. The replier SHOULD
941 * deal with the issue by returning NFS4ERR_DELAY as the
942 * reply to SEQUENCE or CB_SEQUENCE operation, but
943 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
944 *
945 * Restart the search after a delay.
946 */
947 slot->seq_nr = slot->seq_nr_highest_sent;
948 goto out_retry;
949 case -NFS4ERR_BADSESSION:
950 case -NFS4ERR_DEADSESSION:
951 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
952 goto session_recover;
953 default:
954 /* Just update the slot sequence no. */
955 slot->seq_done = 1;
956 }
957 out:
958 /* The session may be reset by one of the error handlers. */
959 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
960 out_noaction:
961 return ret;
962 session_recover:
963 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
964 nfs4_schedule_session_recovery(session, status);
965 dprintk("%s ERROR: %d Reset session\n", __func__, status);
966 nfs41_sequence_free_slot(res);
967 goto out;
968 retry_new_seq:
969 ++slot->seq_nr;
970 retry_nowait:
971 if (rpc_restart_call_prepare(task)) {
972 nfs41_sequence_free_slot(res);
973 task->tk_status = 0;
974 ret = 0;
975 }
976 goto out;
977 out_retry:
978 if (!rpc_restart_call(task))
979 goto out;
980 rpc_delay(task, NFS4_POLL_RETRY_MAX);
981 return 0;
982 }
983
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)984 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
985 {
986 if (!nfs41_sequence_process(task, res))
987 return 0;
988 if (res->sr_slot != NULL)
989 nfs41_sequence_free_slot(res);
990 return 1;
991
992 }
993 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
994
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)995 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
996 {
997 if (res->sr_slot == NULL)
998 return 1;
999 if (res->sr_slot->table->session != NULL)
1000 return nfs41_sequence_process(task, res);
1001 return nfs40_sequence_done(task, res);
1002 }
1003
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1004 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1005 {
1006 if (res->sr_slot != NULL) {
1007 if (res->sr_slot->table->session != NULL)
1008 nfs41_sequence_free_slot(res);
1009 else
1010 nfs40_sequence_free_slot(res);
1011 }
1012 }
1013
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1014 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1015 {
1016 if (res->sr_slot == NULL)
1017 return 1;
1018 if (!res->sr_slot->table->session)
1019 return nfs40_sequence_done(task, res);
1020 return nfs41_sequence_done(task, res);
1021 }
1022 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1023
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)1024 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1025 {
1026 struct nfs4_call_sync_data *data = calldata;
1027
1028 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1029
1030 nfs4_setup_sequence(data->seq_server->nfs_client,
1031 data->seq_args, data->seq_res, task);
1032 }
1033
nfs41_call_sync_done(struct rpc_task * task,void * calldata)1034 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1035 {
1036 struct nfs4_call_sync_data *data = calldata;
1037
1038 nfs41_sequence_done(task, data->seq_res);
1039 }
1040
1041 static const struct rpc_call_ops nfs41_call_sync_ops = {
1042 .rpc_call_prepare = nfs41_call_sync_prepare,
1043 .rpc_call_done = nfs41_call_sync_done,
1044 };
1045
1046 #else /* !CONFIG_NFS_V4_1 */
1047
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1048 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1049 {
1050 return nfs40_sequence_done(task, res);
1051 }
1052
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1053 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1054 {
1055 if (res->sr_slot != NULL)
1056 nfs40_sequence_free_slot(res);
1057 }
1058
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1059 int nfs4_sequence_done(struct rpc_task *task,
1060 struct nfs4_sequence_res *res)
1061 {
1062 return nfs40_sequence_done(task, res);
1063 }
1064 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1065
1066 #endif /* !CONFIG_NFS_V4_1 */
1067
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1068 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1069 {
1070 res->sr_timestamp = jiffies;
1071 res->sr_status_flags = 0;
1072 res->sr_status = 1;
1073 }
1074
1075 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1076 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1077 struct nfs4_sequence_res *res,
1078 struct nfs4_slot *slot)
1079 {
1080 if (!slot)
1081 return;
1082 slot->privileged = args->sa_privileged ? 1 : 0;
1083 args->sa_slot = slot;
1084
1085 res->sr_slot = slot;
1086 }
1087
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1088 int nfs4_setup_sequence(struct nfs_client *client,
1089 struct nfs4_sequence_args *args,
1090 struct nfs4_sequence_res *res,
1091 struct rpc_task *task)
1092 {
1093 struct nfs4_session *session = nfs4_get_session(client);
1094 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1095 struct nfs4_slot *slot;
1096
1097 /* slot already allocated? */
1098 if (res->sr_slot != NULL)
1099 goto out_start;
1100
1101 if (session)
1102 tbl = &session->fc_slot_table;
1103
1104 spin_lock(&tbl->slot_tbl_lock);
1105 /* The state manager will wait until the slot table is empty */
1106 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1107 goto out_sleep;
1108
1109 slot = nfs4_alloc_slot(tbl);
1110 if (IS_ERR(slot)) {
1111 if (slot == ERR_PTR(-ENOMEM))
1112 goto out_sleep_timeout;
1113 goto out_sleep;
1114 }
1115 spin_unlock(&tbl->slot_tbl_lock);
1116
1117 nfs4_sequence_attach_slot(args, res, slot);
1118
1119 trace_nfs4_setup_sequence(session, args);
1120 out_start:
1121 nfs41_sequence_res_init(res);
1122 rpc_call_start(task);
1123 return 0;
1124 out_sleep_timeout:
1125 /* Try again in 1/4 second */
1126 if (args->sa_privileged)
1127 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1128 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1129 else
1130 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1131 NULL, jiffies + (HZ >> 2));
1132 spin_unlock(&tbl->slot_tbl_lock);
1133 return -EAGAIN;
1134 out_sleep:
1135 if (args->sa_privileged)
1136 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1137 RPC_PRIORITY_PRIVILEGED);
1138 else
1139 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1140 spin_unlock(&tbl->slot_tbl_lock);
1141 return -EAGAIN;
1142 }
1143 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1144
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1145 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1146 {
1147 struct nfs4_call_sync_data *data = calldata;
1148 nfs4_setup_sequence(data->seq_server->nfs_client,
1149 data->seq_args, data->seq_res, task);
1150 }
1151
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1152 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1153 {
1154 struct nfs4_call_sync_data *data = calldata;
1155 nfs4_sequence_done(task, data->seq_res);
1156 }
1157
1158 static const struct rpc_call_ops nfs40_call_sync_ops = {
1159 .rpc_call_prepare = nfs40_call_sync_prepare,
1160 .rpc_call_done = nfs40_call_sync_done,
1161 };
1162
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1163 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1164 {
1165 int ret;
1166 struct rpc_task *task;
1167
1168 task = rpc_run_task(task_setup);
1169 if (IS_ERR(task))
1170 return PTR_ERR(task);
1171
1172 ret = task->tk_status;
1173 rpc_put_task(task);
1174 return ret;
1175 }
1176
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1177 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1178 struct nfs_server *server,
1179 struct rpc_message *msg,
1180 struct nfs4_sequence_args *args,
1181 struct nfs4_sequence_res *res,
1182 unsigned short task_flags)
1183 {
1184 struct nfs_client *clp = server->nfs_client;
1185 struct nfs4_call_sync_data data = {
1186 .seq_server = server,
1187 .seq_args = args,
1188 .seq_res = res,
1189 };
1190 struct rpc_task_setup task_setup = {
1191 .rpc_client = clnt,
1192 .rpc_message = msg,
1193 .callback_ops = clp->cl_mvops->call_sync_ops,
1194 .callback_data = &data,
1195 .flags = task_flags,
1196 };
1197
1198 return nfs4_call_sync_custom(&task_setup);
1199 }
1200
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1201 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1202 struct nfs_server *server,
1203 struct rpc_message *msg,
1204 struct nfs4_sequence_args *args,
1205 struct nfs4_sequence_res *res)
1206 {
1207 unsigned short task_flags = 0;
1208
1209 if (server->caps & NFS_CAP_MOVEABLE)
1210 task_flags = RPC_TASK_MOVEABLE;
1211 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1212 }
1213
1214
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1215 int nfs4_call_sync(struct rpc_clnt *clnt,
1216 struct nfs_server *server,
1217 struct rpc_message *msg,
1218 struct nfs4_sequence_args *args,
1219 struct nfs4_sequence_res *res,
1220 int cache_reply)
1221 {
1222 nfs4_init_sequence(args, res, cache_reply, 0);
1223 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1224 }
1225
1226 static void
nfs4_inc_nlink_locked(struct inode * inode)1227 nfs4_inc_nlink_locked(struct inode *inode)
1228 {
1229 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1230 NFS_INO_INVALID_CTIME |
1231 NFS_INO_INVALID_NLINK);
1232 inc_nlink(inode);
1233 }
1234
1235 static void
nfs4_inc_nlink(struct inode * inode)1236 nfs4_inc_nlink(struct inode *inode)
1237 {
1238 spin_lock(&inode->i_lock);
1239 nfs4_inc_nlink_locked(inode);
1240 spin_unlock(&inode->i_lock);
1241 }
1242
1243 static void
nfs4_dec_nlink_locked(struct inode * inode)1244 nfs4_dec_nlink_locked(struct inode *inode)
1245 {
1246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1247 NFS_INO_INVALID_CTIME |
1248 NFS_INO_INVALID_NLINK);
1249 drop_nlink(inode);
1250 }
1251
1252 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1253 nfs4_update_changeattr_locked(struct inode *inode,
1254 struct nfs4_change_info *cinfo,
1255 unsigned long timestamp, unsigned long cache_validity)
1256 {
1257 struct nfs_inode *nfsi = NFS_I(inode);
1258 u64 change_attr = inode_peek_iversion_raw(inode);
1259
1260 if (!nfs_have_delegated_mtime(inode))
1261 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1262 if (S_ISDIR(inode->i_mode))
1263 cache_validity |= NFS_INO_INVALID_DATA;
1264
1265 switch (NFS_SERVER(inode)->change_attr_type) {
1266 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1267 if (cinfo->after == change_attr)
1268 goto out;
1269 break;
1270 default:
1271 if ((s64)(change_attr - cinfo->after) >= 0)
1272 goto out;
1273 }
1274
1275 inode_set_iversion_raw(inode, cinfo->after);
1276 if (!cinfo->atomic || cinfo->before != change_attr) {
1277 if (S_ISDIR(inode->i_mode))
1278 nfs_force_lookup_revalidate(inode);
1279
1280 if (!nfs_have_delegated_attributes(inode))
1281 cache_validity |=
1282 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1283 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1284 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1285 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1286 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1287 }
1288 nfsi->attrtimeo_timestamp = jiffies;
1289 nfsi->read_cache_jiffies = timestamp;
1290 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1291 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1292 out:
1293 nfs_set_cache_invalid(inode, cache_validity);
1294 }
1295
1296 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1297 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1298 unsigned long timestamp, unsigned long cache_validity)
1299 {
1300 spin_lock(&dir->i_lock);
1301 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1302 spin_unlock(&dir->i_lock);
1303 }
1304
1305 struct nfs4_open_createattrs {
1306 struct nfs4_label *label;
1307 struct iattr *sattr;
1308 const __u32 verf[2];
1309 };
1310
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1311 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1312 int err, struct nfs4_exception *exception)
1313 {
1314 if (err != -EINVAL)
1315 return false;
1316 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1317 return false;
1318 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1319 exception->retry = 1;
1320 return true;
1321 }
1322
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1323 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1324 {
1325 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1326 }
1327
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1328 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1329 {
1330 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1331
1332 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1333 }
1334
1335 static u32
nfs4_fmode_to_share_access(fmode_t fmode)1336 nfs4_fmode_to_share_access(fmode_t fmode)
1337 {
1338 u32 res = 0;
1339
1340 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1341 case FMODE_READ:
1342 res = NFS4_SHARE_ACCESS_READ;
1343 break;
1344 case FMODE_WRITE:
1345 res = NFS4_SHARE_ACCESS_WRITE;
1346 break;
1347 case FMODE_READ|FMODE_WRITE:
1348 res = NFS4_SHARE_ACCESS_BOTH;
1349 }
1350 return res;
1351 }
1352
1353 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1354 nfs4_map_atomic_open_share(struct nfs_server *server,
1355 fmode_t fmode, int openflags)
1356 {
1357 u32 res = nfs4_fmode_to_share_access(fmode);
1358
1359 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1360 goto out;
1361 /* Want no delegation if we're using O_DIRECT */
1362 if (openflags & O_DIRECT) {
1363 res |= NFS4_SHARE_WANT_NO_DELEG;
1364 goto out;
1365 }
1366 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1367 if (server->caps & NFS_CAP_DELEGTIME)
1368 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1369 if (server->caps & NFS_CAP_OPEN_XOR)
1370 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1371 out:
1372 return res;
1373 }
1374
1375 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1376 nfs4_map_atomic_open_claim(struct nfs_server *server,
1377 enum open_claim_type4 claim)
1378 {
1379 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1380 return claim;
1381 switch (claim) {
1382 default:
1383 return claim;
1384 case NFS4_OPEN_CLAIM_FH:
1385 return NFS4_OPEN_CLAIM_NULL;
1386 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1387 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1388 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1389 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1390 }
1391 }
1392
nfs4_init_opendata_res(struct nfs4_opendata * p)1393 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1394 {
1395 p->o_res.f_attr = &p->f_attr;
1396 p->o_res.seqid = p->o_arg.seqid;
1397 p->c_res.seqid = p->c_arg.seqid;
1398 p->o_res.server = p->o_arg.server;
1399 p->o_res.access_request = p->o_arg.access;
1400 nfs_fattr_init(&p->f_attr);
1401 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1402 }
1403
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1404 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1405 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1406 const struct nfs4_open_createattrs *c,
1407 enum open_claim_type4 claim,
1408 gfp_t gfp_mask)
1409 {
1410 struct dentry *parent = dget_parent(dentry);
1411 struct inode *dir = d_inode(parent);
1412 struct nfs_server *server = NFS_SERVER(dir);
1413 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1414 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1415 struct nfs4_opendata *p;
1416
1417 p = kzalloc(sizeof(*p), gfp_mask);
1418 if (p == NULL)
1419 goto err;
1420
1421 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1422 if (IS_ERR(p->f_attr.label))
1423 goto err_free_p;
1424
1425 p->a_label = nfs4_label_alloc(server, gfp_mask);
1426 if (IS_ERR(p->a_label))
1427 goto err_free_f;
1428
1429 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1430 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1431 if (IS_ERR(p->o_arg.seqid))
1432 goto err_free_label;
1433 nfs_sb_active(dentry->d_sb);
1434 p->dentry = dget(dentry);
1435 p->dir = parent;
1436 p->owner = sp;
1437 atomic_inc(&sp->so_count);
1438 p->o_arg.open_flags = flags;
1439 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1440 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1441 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1442 fmode, flags);
1443 if (flags & O_CREAT) {
1444 p->o_arg.umask = current_umask();
1445 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1446 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1447 p->o_arg.u.attrs = &p->attrs;
1448 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1449
1450 memcpy(p->o_arg.u.verifier.data, c->verf,
1451 sizeof(p->o_arg.u.verifier.data));
1452 }
1453 }
1454 /* ask server to check for all possible rights as results
1455 * are cached */
1456 switch (p->o_arg.claim) {
1457 default:
1458 break;
1459 case NFS4_OPEN_CLAIM_NULL:
1460 case NFS4_OPEN_CLAIM_FH:
1461 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1462 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1463 NFS4_ACCESS_EXECUTE |
1464 nfs_access_xattr_mask(server);
1465 }
1466 p->o_arg.clientid = server->nfs_client->cl_clientid;
1467 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1468 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1469 p->o_arg.name = &dentry->d_name;
1470 p->o_arg.server = server;
1471 p->o_arg.bitmask = nfs4_bitmask(server, label);
1472 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1473 switch (p->o_arg.claim) {
1474 case NFS4_OPEN_CLAIM_NULL:
1475 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1476 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1477 p->o_arg.fh = NFS_FH(dir);
1478 break;
1479 case NFS4_OPEN_CLAIM_PREVIOUS:
1480 case NFS4_OPEN_CLAIM_FH:
1481 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1482 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1483 p->o_arg.fh = NFS_FH(d_inode(dentry));
1484 }
1485 p->c_arg.fh = &p->o_res.fh;
1486 p->c_arg.stateid = &p->o_res.stateid;
1487 p->c_arg.seqid = p->o_arg.seqid;
1488 nfs4_init_opendata_res(p);
1489 kref_init(&p->kref);
1490 return p;
1491
1492 err_free_label:
1493 nfs4_label_free(p->a_label);
1494 err_free_f:
1495 nfs4_label_free(p->f_attr.label);
1496 err_free_p:
1497 kfree(p);
1498 err:
1499 dput(parent);
1500 return NULL;
1501 }
1502
nfs4_opendata_free(struct kref * kref)1503 static void nfs4_opendata_free(struct kref *kref)
1504 {
1505 struct nfs4_opendata *p = container_of(kref,
1506 struct nfs4_opendata, kref);
1507 struct super_block *sb = p->dentry->d_sb;
1508
1509 nfs4_lgopen_release(p->lgp);
1510 nfs_free_seqid(p->o_arg.seqid);
1511 nfs4_sequence_free_slot(&p->o_res.seq_res);
1512 if (p->state != NULL)
1513 nfs4_put_open_state(p->state);
1514 nfs4_put_state_owner(p->owner);
1515
1516 nfs4_label_free(p->a_label);
1517 nfs4_label_free(p->f_attr.label);
1518
1519 dput(p->dir);
1520 dput(p->dentry);
1521 nfs_sb_deactive(sb);
1522 nfs_fattr_free_names(&p->f_attr);
1523 kfree(p->f_attr.mdsthreshold);
1524 kfree(p);
1525 }
1526
nfs4_opendata_put(struct nfs4_opendata * p)1527 static void nfs4_opendata_put(struct nfs4_opendata *p)
1528 {
1529 if (p != NULL)
1530 kref_put(&p->kref, nfs4_opendata_free);
1531 }
1532
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1533 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1534 fmode_t fmode)
1535 {
1536 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1537 case FMODE_READ|FMODE_WRITE:
1538 return state->n_rdwr != 0;
1539 case FMODE_WRITE:
1540 return state->n_wronly != 0;
1541 case FMODE_READ:
1542 return state->n_rdonly != 0;
1543 }
1544 WARN_ON_ONCE(1);
1545 return false;
1546 }
1547
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1548 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1549 int open_mode, enum open_claim_type4 claim)
1550 {
1551 int ret = 0;
1552
1553 if (open_mode & (O_EXCL|O_TRUNC))
1554 goto out;
1555 switch (claim) {
1556 case NFS4_OPEN_CLAIM_NULL:
1557 case NFS4_OPEN_CLAIM_FH:
1558 goto out;
1559 default:
1560 break;
1561 }
1562 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1563 case FMODE_READ:
1564 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1565 && state->n_rdonly != 0;
1566 break;
1567 case FMODE_WRITE:
1568 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1569 && state->n_wronly != 0;
1570 break;
1571 case FMODE_READ|FMODE_WRITE:
1572 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1573 && state->n_rdwr != 0;
1574 }
1575 out:
1576 return ret;
1577 }
1578
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1579 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1580 enum open_claim_type4 claim)
1581 {
1582 if (delegation == NULL)
1583 return 0;
1584 if ((delegation->type & fmode) != fmode)
1585 return 0;
1586 switch (claim) {
1587 case NFS4_OPEN_CLAIM_NULL:
1588 case NFS4_OPEN_CLAIM_FH:
1589 break;
1590 case NFS4_OPEN_CLAIM_PREVIOUS:
1591 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1592 break;
1593 fallthrough;
1594 default:
1595 return 0;
1596 }
1597 nfs_mark_delegation_referenced(delegation);
1598 return 1;
1599 }
1600
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1601 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1602 {
1603 switch (fmode) {
1604 case FMODE_WRITE:
1605 state->n_wronly++;
1606 break;
1607 case FMODE_READ:
1608 state->n_rdonly++;
1609 break;
1610 case FMODE_READ|FMODE_WRITE:
1611 state->n_rdwr++;
1612 }
1613 nfs4_state_set_mode_locked(state, state->state | fmode);
1614 }
1615
1616 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1617 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1618 {
1619 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1620 return true;
1621 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1622 return true;
1623 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1624 return true;
1625 return false;
1626 }
1627 #endif /* CONFIG_NFS_V4_1 */
1628
nfs_state_log_update_open_stateid(struct nfs4_state * state)1629 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1630 {
1631 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1632 wake_up_all(&state->waitq);
1633 }
1634
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1635 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1636 {
1637 struct nfs_client *clp = state->owner->so_server->nfs_client;
1638 bool need_recover = false;
1639
1640 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1641 need_recover = true;
1642 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1643 need_recover = true;
1644 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1645 need_recover = true;
1646 if (need_recover)
1647 nfs4_state_mark_reclaim_nograce(clp, state);
1648 }
1649
1650 /*
1651 * Check for whether or not the caller may update the open stateid
1652 * to the value passed in by stateid.
1653 *
1654 * Note: This function relies heavily on the server implementing
1655 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1656 * correctly.
1657 * i.e. The stateid seqids have to be initialised to 1, and
1658 * are then incremented on every state transition.
1659 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1660 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1661 const nfs4_stateid *stateid)
1662 {
1663 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1664 /* The common case - we're updating to a new sequence number */
1665 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1666 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1667 return true;
1668 return false;
1669 }
1670 /* The server returned a new stateid */
1671 }
1672 /* This is the first OPEN in this generation */
1673 if (stateid->seqid == cpu_to_be32(1))
1674 return true;
1675 return false;
1676 }
1677
nfs_resync_open_stateid_locked(struct nfs4_state * state)1678 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1679 {
1680 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1681 return;
1682 if (state->n_wronly)
1683 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1684 if (state->n_rdonly)
1685 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1686 if (state->n_rdwr)
1687 set_bit(NFS_O_RDWR_STATE, &state->flags);
1688 set_bit(NFS_OPEN_STATE, &state->flags);
1689 }
1690
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1691 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1692 nfs4_stateid *stateid, fmode_t fmode)
1693 {
1694 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1695 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1696 case FMODE_WRITE:
1697 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1698 break;
1699 case FMODE_READ:
1700 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1701 break;
1702 case 0:
1703 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1704 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1705 clear_bit(NFS_OPEN_STATE, &state->flags);
1706 }
1707 if (stateid == NULL)
1708 return;
1709 /* Handle OPEN+OPEN_DOWNGRADE races */
1710 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1711 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1712 nfs_resync_open_stateid_locked(state);
1713 goto out;
1714 }
1715 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1716 nfs4_stateid_copy(&state->stateid, stateid);
1717 nfs4_stateid_copy(&state->open_stateid, stateid);
1718 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1719 out:
1720 nfs_state_log_update_open_stateid(state);
1721 }
1722
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1723 static void nfs_clear_open_stateid(struct nfs4_state *state,
1724 nfs4_stateid *arg_stateid,
1725 nfs4_stateid *stateid, fmode_t fmode)
1726 {
1727 write_seqlock(&state->seqlock);
1728 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1729 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1730 nfs_clear_open_stateid_locked(state, stateid, fmode);
1731 write_sequnlock(&state->seqlock);
1732 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1733 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1734 }
1735
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1736 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1737 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1738 __must_hold(&state->owner->so_lock)
1739 __must_hold(&state->seqlock)
1740 __must_hold(RCU)
1741
1742 {
1743 DEFINE_WAIT(wait);
1744 int status = 0;
1745 for (;;) {
1746
1747 if (nfs_stateid_is_sequential(state, stateid))
1748 break;
1749
1750 if (status)
1751 break;
1752 /* Rely on seqids for serialisation with NFSv4.0 */
1753 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1754 break;
1755
1756 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1757 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1758 /*
1759 * Ensure we process the state changes in the same order
1760 * in which the server processed them by delaying the
1761 * update of the stateid until we are in sequence.
1762 */
1763 write_sequnlock(&state->seqlock);
1764 spin_unlock(&state->owner->so_lock);
1765 rcu_read_unlock();
1766 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1767
1768 if (!fatal_signal_pending(current)) {
1769 if (schedule_timeout(5*HZ) == 0)
1770 status = -EAGAIN;
1771 else
1772 status = 0;
1773 } else
1774 status = -EINTR;
1775 finish_wait(&state->waitq, &wait);
1776 rcu_read_lock();
1777 spin_lock(&state->owner->so_lock);
1778 write_seqlock(&state->seqlock);
1779 }
1780
1781 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1782 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1783 nfs4_stateid_copy(freeme, &state->open_stateid);
1784 nfs_test_and_clear_all_open_stateid(state);
1785 }
1786
1787 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1788 nfs4_stateid_copy(&state->stateid, stateid);
1789 nfs4_stateid_copy(&state->open_stateid, stateid);
1790 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1791 nfs_state_log_update_open_stateid(state);
1792 }
1793
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1794 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1795 const nfs4_stateid *open_stateid,
1796 fmode_t fmode,
1797 nfs4_stateid *freeme)
1798 {
1799 /*
1800 * Protect the call to nfs4_state_set_mode_locked and
1801 * serialise the stateid update
1802 */
1803 write_seqlock(&state->seqlock);
1804 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1805 switch (fmode) {
1806 case FMODE_READ:
1807 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1808 break;
1809 case FMODE_WRITE:
1810 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1811 break;
1812 case FMODE_READ|FMODE_WRITE:
1813 set_bit(NFS_O_RDWR_STATE, &state->flags);
1814 }
1815 set_bit(NFS_OPEN_STATE, &state->flags);
1816 write_sequnlock(&state->seqlock);
1817 }
1818
nfs_state_clear_open_state_flags(struct nfs4_state * state)1819 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1820 {
1821 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1822 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1823 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1824 clear_bit(NFS_OPEN_STATE, &state->flags);
1825 }
1826
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1827 static void nfs_state_set_delegation(struct nfs4_state *state,
1828 const nfs4_stateid *deleg_stateid,
1829 fmode_t fmode)
1830 {
1831 /*
1832 * Protect the call to nfs4_state_set_mode_locked and
1833 * serialise the stateid update
1834 */
1835 write_seqlock(&state->seqlock);
1836 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1837 set_bit(NFS_DELEGATED_STATE, &state->flags);
1838 write_sequnlock(&state->seqlock);
1839 }
1840
nfs_state_clear_delegation(struct nfs4_state * state)1841 static void nfs_state_clear_delegation(struct nfs4_state *state)
1842 {
1843 write_seqlock(&state->seqlock);
1844 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1845 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1846 write_sequnlock(&state->seqlock);
1847 }
1848
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1849 int update_open_stateid(struct nfs4_state *state,
1850 const nfs4_stateid *open_stateid,
1851 const nfs4_stateid *delegation,
1852 fmode_t fmode)
1853 {
1854 struct nfs_server *server = NFS_SERVER(state->inode);
1855 struct nfs_client *clp = server->nfs_client;
1856 struct nfs_inode *nfsi = NFS_I(state->inode);
1857 struct nfs_delegation *deleg_cur;
1858 nfs4_stateid freeme = { };
1859 int ret = 0;
1860
1861 fmode &= (FMODE_READ|FMODE_WRITE);
1862
1863 rcu_read_lock();
1864 spin_lock(&state->owner->so_lock);
1865 if (open_stateid != NULL) {
1866 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1867 ret = 1;
1868 }
1869
1870 deleg_cur = nfs4_get_valid_delegation(state->inode);
1871 if (deleg_cur == NULL)
1872 goto no_delegation;
1873
1874 spin_lock(&deleg_cur->lock);
1875 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1876 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1877 (deleg_cur->type & fmode) != fmode)
1878 goto no_delegation_unlock;
1879
1880 if (delegation == NULL)
1881 delegation = &deleg_cur->stateid;
1882 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1883 goto no_delegation_unlock;
1884
1885 nfs_mark_delegation_referenced(deleg_cur);
1886 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1887 ret = 1;
1888 no_delegation_unlock:
1889 spin_unlock(&deleg_cur->lock);
1890 no_delegation:
1891 if (ret)
1892 update_open_stateflags(state, fmode);
1893 spin_unlock(&state->owner->so_lock);
1894 rcu_read_unlock();
1895
1896 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1897 nfs4_schedule_state_manager(clp);
1898 if (freeme.type != 0)
1899 nfs4_test_and_free_stateid(server, &freeme,
1900 state->owner->so_cred);
1901
1902 return ret;
1903 }
1904
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1905 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1906 const nfs4_stateid *stateid)
1907 {
1908 struct nfs4_state *state = lsp->ls_state;
1909 bool ret = false;
1910
1911 spin_lock(&state->state_lock);
1912 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1913 goto out_noupdate;
1914 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1915 goto out_noupdate;
1916 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1917 ret = true;
1918 out_noupdate:
1919 spin_unlock(&state->state_lock);
1920 return ret;
1921 }
1922
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1923 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1924 {
1925 struct nfs_delegation *delegation;
1926
1927 fmode &= FMODE_READ|FMODE_WRITE;
1928 rcu_read_lock();
1929 delegation = nfs4_get_valid_delegation(inode);
1930 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1931 rcu_read_unlock();
1932 return;
1933 }
1934 rcu_read_unlock();
1935 nfs4_inode_return_delegation(inode);
1936 }
1937
nfs4_try_open_cached(struct nfs4_opendata * opendata)1938 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1939 {
1940 struct nfs4_state *state = opendata->state;
1941 struct nfs_delegation *delegation;
1942 int open_mode = opendata->o_arg.open_flags;
1943 fmode_t fmode = opendata->o_arg.fmode;
1944 enum open_claim_type4 claim = opendata->o_arg.claim;
1945 nfs4_stateid stateid;
1946 int ret = -EAGAIN;
1947
1948 for (;;) {
1949 spin_lock(&state->owner->so_lock);
1950 if (can_open_cached(state, fmode, open_mode, claim)) {
1951 update_open_stateflags(state, fmode);
1952 spin_unlock(&state->owner->so_lock);
1953 goto out_return_state;
1954 }
1955 spin_unlock(&state->owner->so_lock);
1956 rcu_read_lock();
1957 delegation = nfs4_get_valid_delegation(state->inode);
1958 if (!can_open_delegated(delegation, fmode, claim)) {
1959 rcu_read_unlock();
1960 break;
1961 }
1962 /* Save the delegation */
1963 nfs4_stateid_copy(&stateid, &delegation->stateid);
1964 rcu_read_unlock();
1965 nfs_release_seqid(opendata->o_arg.seqid);
1966 if (!opendata->is_recover) {
1967 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1968 if (ret != 0)
1969 goto out;
1970 }
1971 ret = -EAGAIN;
1972
1973 /* Try to update the stateid using the delegation */
1974 if (update_open_stateid(state, NULL, &stateid, fmode))
1975 goto out_return_state;
1976 }
1977 out:
1978 return ERR_PTR(ret);
1979 out_return_state:
1980 refcount_inc(&state->count);
1981 return state;
1982 }
1983
1984 static void
nfs4_process_delegation(struct inode * inode,const struct cred * cred,enum open_claim_type4 claim,const struct nfs4_open_delegation * delegation)1985 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
1986 enum open_claim_type4 claim,
1987 const struct nfs4_open_delegation *delegation)
1988 {
1989 switch (delegation->open_delegation_type) {
1990 case NFS4_OPEN_DELEGATE_READ:
1991 case NFS4_OPEN_DELEGATE_WRITE:
1992 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
1993 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
1994 break;
1995 default:
1996 return;
1997 }
1998 switch (claim) {
1999 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2000 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2001 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
2002 "returning a delegation for "
2003 "OPEN(CLAIM_DELEGATE_CUR)\n",
2004 NFS_SERVER(inode)->nfs_client->cl_hostname);
2005 break;
2006 case NFS4_OPEN_CLAIM_PREVIOUS:
2007 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
2008 &delegation->stateid,
2009 delegation->pagemod_limit,
2010 delegation->open_delegation_type);
2011 break;
2012 default:
2013 nfs_inode_set_delegation(inode, cred, delegation->type,
2014 &delegation->stateid,
2015 delegation->pagemod_limit,
2016 delegation->open_delegation_type);
2017 }
2018 if (delegation->do_recall)
2019 nfs_async_inode_return_delegation(inode, &delegation->stateid);
2020 }
2021
2022 /*
2023 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
2024 * and update the nfs4_state.
2025 */
2026 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)2027 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2028 {
2029 struct inode *inode = data->state->inode;
2030 struct nfs4_state *state = data->state;
2031 int ret;
2032
2033 if (!data->rpc_done) {
2034 if (data->rpc_status)
2035 return ERR_PTR(data->rpc_status);
2036 return nfs4_try_open_cached(data);
2037 }
2038
2039 ret = nfs_refresh_inode(inode, &data->f_attr);
2040 if (ret)
2041 return ERR_PTR(ret);
2042
2043 nfs4_process_delegation(state->inode,
2044 data->owner->so_cred,
2045 data->o_arg.claim,
2046 &data->o_res.delegation);
2047
2048 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2049 if (!update_open_stateid(state, &data->o_res.stateid,
2050 NULL, data->o_arg.fmode))
2051 return ERR_PTR(-EAGAIN);
2052 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2053 return ERR_PTR(-EAGAIN);
2054 refcount_inc(&state->count);
2055
2056 return state;
2057 }
2058
2059 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2060 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2061 {
2062 struct inode *inode;
2063
2064 switch (data->o_arg.claim) {
2065 case NFS4_OPEN_CLAIM_NULL:
2066 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2067 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2068 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2069 return ERR_PTR(-EAGAIN);
2070 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2071 &data->f_attr);
2072 break;
2073 default:
2074 inode = d_inode(data->dentry);
2075 ihold(inode);
2076 nfs_refresh_inode(inode, &data->f_attr);
2077 }
2078 return inode;
2079 }
2080
2081 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2082 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2083 {
2084 struct nfs4_state *state;
2085 struct inode *inode;
2086
2087 inode = nfs4_opendata_get_inode(data);
2088 if (IS_ERR(inode))
2089 return ERR_CAST(inode);
2090 if (data->state != NULL && data->state->inode == inode) {
2091 state = data->state;
2092 refcount_inc(&state->count);
2093 } else
2094 state = nfs4_get_open_state(inode, data->owner);
2095 iput(inode);
2096 if (state == NULL)
2097 state = ERR_PTR(-ENOMEM);
2098 return state;
2099 }
2100
2101 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2102 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2103 {
2104 struct nfs4_state *state;
2105
2106 if (!data->rpc_done) {
2107 state = nfs4_try_open_cached(data);
2108 trace_nfs4_cached_open(data->state);
2109 goto out;
2110 }
2111
2112 state = nfs4_opendata_find_nfs4_state(data);
2113 if (IS_ERR(state))
2114 goto out;
2115
2116 nfs4_process_delegation(state->inode,
2117 data->owner->so_cred,
2118 data->o_arg.claim,
2119 &data->o_res.delegation);
2120
2121 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2122 if (!update_open_stateid(state, &data->o_res.stateid,
2123 NULL, data->o_arg.fmode)) {
2124 nfs4_put_open_state(state);
2125 state = ERR_PTR(-EAGAIN);
2126 }
2127 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2128 nfs4_put_open_state(state);
2129 state = ERR_PTR(-EAGAIN);
2130 }
2131 out:
2132 nfs_release_seqid(data->o_arg.seqid);
2133 return state;
2134 }
2135
2136 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2137 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2138 {
2139 struct nfs4_state *ret;
2140
2141 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2142 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2143 else
2144 ret = _nfs4_opendata_to_nfs4_state(data);
2145 nfs4_sequence_free_slot(&data->o_res.seq_res);
2146 return ret;
2147 }
2148
2149 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2150 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2151 {
2152 struct nfs_inode *nfsi = NFS_I(state->inode);
2153 struct nfs_open_context *ctx;
2154
2155 rcu_read_lock();
2156 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2157 if (ctx->state != state)
2158 continue;
2159 if ((ctx->mode & mode) != mode)
2160 continue;
2161 if (!get_nfs_open_context(ctx))
2162 continue;
2163 rcu_read_unlock();
2164 return ctx;
2165 }
2166 rcu_read_unlock();
2167 return ERR_PTR(-ENOENT);
2168 }
2169
2170 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2171 nfs4_state_find_open_context(struct nfs4_state *state)
2172 {
2173 struct nfs_open_context *ctx;
2174
2175 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2176 if (!IS_ERR(ctx))
2177 return ctx;
2178 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2179 if (!IS_ERR(ctx))
2180 return ctx;
2181 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2182 }
2183
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2184 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2185 struct nfs4_state *state, enum open_claim_type4 claim)
2186 {
2187 struct nfs4_opendata *opendata;
2188
2189 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2190 NULL, claim, GFP_NOFS);
2191 if (opendata == NULL)
2192 return ERR_PTR(-ENOMEM);
2193 opendata->state = state;
2194 refcount_inc(&state->count);
2195 return opendata;
2196 }
2197
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2198 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2199 fmode_t fmode)
2200 {
2201 struct nfs4_state *newstate;
2202 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2203 int openflags = opendata->o_arg.open_flags;
2204 int ret;
2205
2206 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2207 return 0;
2208 opendata->o_arg.fmode = fmode;
2209 opendata->o_arg.share_access =
2210 nfs4_map_atomic_open_share(server, fmode, openflags);
2211 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2212 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2213 nfs4_init_opendata_res(opendata);
2214 ret = _nfs4_recover_proc_open(opendata);
2215 if (ret != 0)
2216 return ret;
2217 newstate = nfs4_opendata_to_nfs4_state(opendata);
2218 if (IS_ERR(newstate))
2219 return PTR_ERR(newstate);
2220 if (newstate != opendata->state)
2221 ret = -ESTALE;
2222 nfs4_close_state(newstate, fmode);
2223 return ret;
2224 }
2225
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2226 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2227 {
2228 int ret;
2229
2230 /* memory barrier prior to reading state->n_* */
2231 smp_rmb();
2232 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2233 if (ret != 0)
2234 return ret;
2235 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2236 if (ret != 0)
2237 return ret;
2238 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2239 if (ret != 0)
2240 return ret;
2241 /*
2242 * We may have performed cached opens for all three recoveries.
2243 * Check if we need to update the current stateid.
2244 */
2245 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2246 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2247 write_seqlock(&state->seqlock);
2248 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2249 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2250 write_sequnlock(&state->seqlock);
2251 }
2252 return 0;
2253 }
2254
2255 /*
2256 * OPEN_RECLAIM:
2257 * reclaim state on the server after a reboot.
2258 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2259 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2260 {
2261 struct nfs_delegation *delegation;
2262 struct nfs4_opendata *opendata;
2263 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2264 int status;
2265
2266 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2267 NFS4_OPEN_CLAIM_PREVIOUS);
2268 if (IS_ERR(opendata))
2269 return PTR_ERR(opendata);
2270 rcu_read_lock();
2271 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2272 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2273 switch(delegation->type) {
2274 case FMODE_READ:
2275 delegation_type = NFS4_OPEN_DELEGATE_READ;
2276 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2277 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2278 break;
2279 case FMODE_WRITE:
2280 case FMODE_READ|FMODE_WRITE:
2281 delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2282 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2283 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2284 }
2285 }
2286 rcu_read_unlock();
2287 opendata->o_arg.u.delegation_type = delegation_type;
2288 status = nfs4_open_recover(opendata, state);
2289 nfs4_opendata_put(opendata);
2290 return status;
2291 }
2292
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2293 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2294 {
2295 struct nfs_server *server = NFS_SERVER(state->inode);
2296 struct nfs4_exception exception = { };
2297 int err;
2298 do {
2299 err = _nfs4_do_open_reclaim(ctx, state);
2300 trace_nfs4_open_reclaim(ctx, 0, err);
2301 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2302 continue;
2303 if (err != -NFS4ERR_DELAY)
2304 break;
2305 nfs4_handle_exception(server, err, &exception);
2306 } while (exception.retry);
2307 return err;
2308 }
2309
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2311 {
2312 struct nfs_open_context *ctx;
2313 int ret;
2314
2315 ctx = nfs4_state_find_open_context(state);
2316 if (IS_ERR(ctx))
2317 return -EAGAIN;
2318 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2319 nfs_state_clear_open_state_flags(state);
2320 ret = nfs4_do_open_reclaim(ctx, state);
2321 put_nfs_open_context(ctx);
2322 return ret;
2323 }
2324
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2325 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2326 {
2327 switch (err) {
2328 default:
2329 printk(KERN_ERR "NFS: %s: unhandled error "
2330 "%d.\n", __func__, err);
2331 fallthrough;
2332 case 0:
2333 case -ENOENT:
2334 case -EAGAIN:
2335 case -ESTALE:
2336 case -ETIMEDOUT:
2337 break;
2338 case -NFS4ERR_BADSESSION:
2339 case -NFS4ERR_BADSLOT:
2340 case -NFS4ERR_BAD_HIGH_SLOT:
2341 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2342 case -NFS4ERR_DEADSESSION:
2343 return -EAGAIN;
2344 case -NFS4ERR_STALE_CLIENTID:
2345 case -NFS4ERR_STALE_STATEID:
2346 /* Don't recall a delegation if it was lost */
2347 nfs4_schedule_lease_recovery(server->nfs_client);
2348 return -EAGAIN;
2349 case -NFS4ERR_MOVED:
2350 nfs4_schedule_migration_recovery(server);
2351 return -EAGAIN;
2352 case -NFS4ERR_LEASE_MOVED:
2353 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2354 return -EAGAIN;
2355 case -NFS4ERR_DELEG_REVOKED:
2356 case -NFS4ERR_ADMIN_REVOKED:
2357 case -NFS4ERR_EXPIRED:
2358 case -NFS4ERR_BAD_STATEID:
2359 case -NFS4ERR_OPENMODE:
2360 nfs_inode_find_state_and_recover(state->inode,
2361 stateid);
2362 nfs4_schedule_stateid_recovery(server, state);
2363 return -EAGAIN;
2364 case -NFS4ERR_DELAY:
2365 case -NFS4ERR_GRACE:
2366 ssleep(1);
2367 return -EAGAIN;
2368 case -ENOMEM:
2369 case -NFS4ERR_DENIED:
2370 if (fl) {
2371 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2372 if (lsp)
2373 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2374 }
2375 return 0;
2376 }
2377 return err;
2378 }
2379
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2380 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2381 struct nfs4_state *state, const nfs4_stateid *stateid)
2382 {
2383 struct nfs_server *server = NFS_SERVER(state->inode);
2384 struct nfs4_opendata *opendata;
2385 int err = 0;
2386
2387 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2388 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2389 if (IS_ERR(opendata))
2390 return PTR_ERR(opendata);
2391 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2392 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2393 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2394 if (err)
2395 goto out;
2396 }
2397 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2398 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2399 if (err)
2400 goto out;
2401 }
2402 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2403 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2404 if (err)
2405 goto out;
2406 }
2407 nfs_state_clear_delegation(state);
2408 out:
2409 nfs4_opendata_put(opendata);
2410 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2411 }
2412
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2413 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2414 {
2415 struct nfs4_opendata *data = calldata;
2416
2417 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2418 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2419 }
2420
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2421 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2422 {
2423 struct nfs4_opendata *data = calldata;
2424
2425 nfs40_sequence_done(task, &data->c_res.seq_res);
2426
2427 data->rpc_status = task->tk_status;
2428 if (data->rpc_status == 0) {
2429 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2430 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2431 renew_lease(data->o_res.server, data->timestamp);
2432 data->rpc_done = true;
2433 }
2434 }
2435
nfs4_open_confirm_release(void * calldata)2436 static void nfs4_open_confirm_release(void *calldata)
2437 {
2438 struct nfs4_opendata *data = calldata;
2439 struct nfs4_state *state = NULL;
2440
2441 /* If this request hasn't been cancelled, do nothing */
2442 if (!data->cancelled)
2443 goto out_free;
2444 /* In case of error, no cleanup! */
2445 if (!data->rpc_done)
2446 goto out_free;
2447 state = nfs4_opendata_to_nfs4_state(data);
2448 if (!IS_ERR(state))
2449 nfs4_close_state(state, data->o_arg.fmode);
2450 out_free:
2451 nfs4_opendata_put(data);
2452 }
2453
2454 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2455 .rpc_call_prepare = nfs4_open_confirm_prepare,
2456 .rpc_call_done = nfs4_open_confirm_done,
2457 .rpc_release = nfs4_open_confirm_release,
2458 };
2459
2460 /*
2461 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2462 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2463 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2464 {
2465 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2466 struct rpc_task *task;
2467 struct rpc_message msg = {
2468 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2469 .rpc_argp = &data->c_arg,
2470 .rpc_resp = &data->c_res,
2471 .rpc_cred = data->owner->so_cred,
2472 };
2473 struct rpc_task_setup task_setup_data = {
2474 .rpc_client = server->client,
2475 .rpc_message = &msg,
2476 .callback_ops = &nfs4_open_confirm_ops,
2477 .callback_data = data,
2478 .workqueue = nfsiod_workqueue,
2479 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2480 };
2481 int status;
2482
2483 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2484 data->is_recover);
2485 kref_get(&data->kref);
2486 data->rpc_done = false;
2487 data->rpc_status = 0;
2488 data->timestamp = jiffies;
2489 task = rpc_run_task(&task_setup_data);
2490 if (IS_ERR(task))
2491 return PTR_ERR(task);
2492 status = rpc_wait_for_completion_task(task);
2493 if (status != 0) {
2494 data->cancelled = true;
2495 smp_wmb();
2496 } else
2497 status = data->rpc_status;
2498 rpc_put_task(task);
2499 return status;
2500 }
2501
nfs4_open_prepare(struct rpc_task * task,void * calldata)2502 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2503 {
2504 struct nfs4_opendata *data = calldata;
2505 struct nfs4_state_owner *sp = data->owner;
2506 struct nfs_client *clp = sp->so_server->nfs_client;
2507 enum open_claim_type4 claim = data->o_arg.claim;
2508
2509 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2510 goto out_wait;
2511 /*
2512 * Check if we still need to send an OPEN call, or if we can use
2513 * a delegation instead.
2514 */
2515 if (data->state != NULL) {
2516 struct nfs_delegation *delegation;
2517
2518 if (can_open_cached(data->state, data->o_arg.fmode,
2519 data->o_arg.open_flags, claim))
2520 goto out_no_action;
2521 rcu_read_lock();
2522 delegation = nfs4_get_valid_delegation(data->state->inode);
2523 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2524 goto unlock_no_action;
2525 rcu_read_unlock();
2526 }
2527 /* Update client id. */
2528 data->o_arg.clientid = clp->cl_clientid;
2529 switch (claim) {
2530 default:
2531 break;
2532 case NFS4_OPEN_CLAIM_PREVIOUS:
2533 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2534 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2535 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2536 fallthrough;
2537 case NFS4_OPEN_CLAIM_FH:
2538 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2539 }
2540 data->timestamp = jiffies;
2541 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2542 &data->o_arg.seq_args,
2543 &data->o_res.seq_res,
2544 task) != 0)
2545 nfs_release_seqid(data->o_arg.seqid);
2546
2547 /* Set the create mode (note dependency on the session type) */
2548 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2549 if (data->o_arg.open_flags & O_EXCL) {
2550 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2551 if (clp->cl_mvops->minor_version == 0) {
2552 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2553 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2554 * because ACCESS will return permission denied for
2555 * all bits until close */
2556 data->o_res.access_request = data->o_arg.access = 0;
2557 } else if (nfs4_has_persistent_session(clp))
2558 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2559 }
2560 return;
2561 unlock_no_action:
2562 trace_nfs4_cached_open(data->state);
2563 rcu_read_unlock();
2564 out_no_action:
2565 task->tk_action = NULL;
2566 out_wait:
2567 nfs4_sequence_done(task, &data->o_res.seq_res);
2568 }
2569
nfs4_open_done(struct rpc_task * task,void * calldata)2570 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2571 {
2572 struct nfs4_opendata *data = calldata;
2573
2574 data->rpc_status = task->tk_status;
2575
2576 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2577 return;
2578
2579 if (task->tk_status == 0) {
2580 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2581 switch (data->o_res.f_attr->mode & S_IFMT) {
2582 case S_IFREG:
2583 break;
2584 case S_IFLNK:
2585 data->rpc_status = -ELOOP;
2586 break;
2587 case S_IFDIR:
2588 data->rpc_status = -EISDIR;
2589 break;
2590 default:
2591 data->rpc_status = -ENOTDIR;
2592 }
2593 }
2594 renew_lease(data->o_res.server, data->timestamp);
2595 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2596 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2597 }
2598 data->rpc_done = true;
2599 }
2600
nfs4_open_release(void * calldata)2601 static void nfs4_open_release(void *calldata)
2602 {
2603 struct nfs4_opendata *data = calldata;
2604 struct nfs4_state *state = NULL;
2605
2606 /* If this request hasn't been cancelled, do nothing */
2607 if (!data->cancelled)
2608 goto out_free;
2609 /* In case of error, no cleanup! */
2610 if (data->rpc_status != 0 || !data->rpc_done)
2611 goto out_free;
2612 /* In case we need an open_confirm, no cleanup! */
2613 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2614 goto out_free;
2615 state = nfs4_opendata_to_nfs4_state(data);
2616 if (!IS_ERR(state))
2617 nfs4_close_state(state, data->o_arg.fmode);
2618 out_free:
2619 nfs4_opendata_put(data);
2620 }
2621
2622 static const struct rpc_call_ops nfs4_open_ops = {
2623 .rpc_call_prepare = nfs4_open_prepare,
2624 .rpc_call_done = nfs4_open_done,
2625 .rpc_release = nfs4_open_release,
2626 };
2627
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2628 static int nfs4_run_open_task(struct nfs4_opendata *data,
2629 struct nfs_open_context *ctx)
2630 {
2631 struct inode *dir = d_inode(data->dir);
2632 struct nfs_server *server = NFS_SERVER(dir);
2633 struct nfs_openargs *o_arg = &data->o_arg;
2634 struct nfs_openres *o_res = &data->o_res;
2635 struct rpc_task *task;
2636 struct rpc_message msg = {
2637 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2638 .rpc_argp = o_arg,
2639 .rpc_resp = o_res,
2640 .rpc_cred = data->owner->so_cred,
2641 };
2642 struct rpc_task_setup task_setup_data = {
2643 .rpc_client = server->client,
2644 .rpc_message = &msg,
2645 .callback_ops = &nfs4_open_ops,
2646 .callback_data = data,
2647 .workqueue = nfsiod_workqueue,
2648 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2649 };
2650 int status;
2651
2652 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2653 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2654
2655 kref_get(&data->kref);
2656 data->rpc_done = false;
2657 data->rpc_status = 0;
2658 data->cancelled = false;
2659 data->is_recover = false;
2660 if (!ctx) {
2661 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2662 data->is_recover = true;
2663 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2664 } else {
2665 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2666 pnfs_lgopen_prepare(data, ctx);
2667 }
2668 task = rpc_run_task(&task_setup_data);
2669 if (IS_ERR(task))
2670 return PTR_ERR(task);
2671 status = rpc_wait_for_completion_task(task);
2672 if (status != 0) {
2673 data->cancelled = true;
2674 smp_wmb();
2675 } else
2676 status = data->rpc_status;
2677 rpc_put_task(task);
2678
2679 return status;
2680 }
2681
_nfs4_recover_proc_open(struct nfs4_opendata * data)2682 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2683 {
2684 struct inode *dir = d_inode(data->dir);
2685 struct nfs_openres *o_res = &data->o_res;
2686 int status;
2687
2688 status = nfs4_run_open_task(data, NULL);
2689 if (status != 0 || !data->rpc_done)
2690 return status;
2691
2692 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2693
2694 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2695 status = _nfs4_proc_open_confirm(data);
2696
2697 return status;
2698 }
2699
2700 /*
2701 * Additional permission checks in order to distinguish between an
2702 * open for read, and an open for execute. This works around the
2703 * fact that NFSv4 OPEN treats read and execute permissions as being
2704 * the same.
2705 * Note that in the non-execute case, we want to turn off permission
2706 * checking if we just created a new file (POSIX open() semantics).
2707 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2708 static int nfs4_opendata_access(const struct cred *cred,
2709 struct nfs4_opendata *opendata,
2710 struct nfs4_state *state, fmode_t fmode)
2711 {
2712 struct nfs_access_entry cache;
2713 u32 mask, flags;
2714
2715 /* access call failed or for some reason the server doesn't
2716 * support any access modes -- defer access call until later */
2717 if (opendata->o_res.access_supported == 0)
2718 return 0;
2719
2720 mask = 0;
2721 if (fmode & FMODE_EXEC) {
2722 /* ONLY check for exec rights */
2723 if (S_ISDIR(state->inode->i_mode))
2724 mask = NFS4_ACCESS_LOOKUP;
2725 else
2726 mask = NFS4_ACCESS_EXECUTE;
2727 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2728 mask = NFS4_ACCESS_READ;
2729
2730 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2731 nfs_access_add_cache(state->inode, &cache, cred);
2732
2733 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2734 if ((mask & ~cache.mask & flags) == 0)
2735 return 0;
2736
2737 return -EACCES;
2738 }
2739
2740 /*
2741 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2742 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2743 static int _nfs4_proc_open(struct nfs4_opendata *data,
2744 struct nfs_open_context *ctx)
2745 {
2746 struct inode *dir = d_inode(data->dir);
2747 struct nfs_server *server = NFS_SERVER(dir);
2748 struct nfs_openargs *o_arg = &data->o_arg;
2749 struct nfs_openres *o_res = &data->o_res;
2750 int status;
2751
2752 status = nfs4_run_open_task(data, ctx);
2753 if (!data->rpc_done)
2754 return status;
2755 if (status != 0) {
2756 if (status == -NFS4ERR_BADNAME &&
2757 !(o_arg->open_flags & O_CREAT))
2758 return -ENOENT;
2759 return status;
2760 }
2761
2762 nfs_fattr_map_and_free_names(server, &data->f_attr);
2763
2764 if (o_arg->open_flags & O_CREAT) {
2765 if (o_arg->open_flags & O_EXCL)
2766 data->file_created = true;
2767 else if (o_res->cinfo.before != o_res->cinfo.after)
2768 data->file_created = true;
2769 if (data->file_created ||
2770 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2771 nfs4_update_changeattr(dir, &o_res->cinfo,
2772 o_res->f_attr->time_start,
2773 NFS_INO_INVALID_DATA);
2774 }
2775 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2776 server->caps &= ~NFS_CAP_POSIX_LOCK;
2777 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2778 status = _nfs4_proc_open_confirm(data);
2779 if (status != 0)
2780 return status;
2781 }
2782 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2783 struct nfs_fh *fh = &o_res->fh;
2784
2785 nfs4_sequence_free_slot(&o_res->seq_res);
2786 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2787 fh = NFS_FH(d_inode(data->dentry));
2788 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2789 }
2790 return 0;
2791 }
2792
2793 /*
2794 * OPEN_EXPIRED:
2795 * reclaim state on the server after a network partition.
2796 * Assumes caller holds the appropriate lock
2797 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2798 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2799 {
2800 struct nfs4_opendata *opendata;
2801 int ret;
2802
2803 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2804 if (IS_ERR(opendata))
2805 return PTR_ERR(opendata);
2806 /*
2807 * We're not recovering a delegation, so ask for no delegation.
2808 * Otherwise the recovery thread could deadlock with an outstanding
2809 * delegation return.
2810 */
2811 opendata->o_arg.open_flags = O_DIRECT;
2812 ret = nfs4_open_recover(opendata, state);
2813 if (ret == -ESTALE)
2814 d_drop(ctx->dentry);
2815 nfs4_opendata_put(opendata);
2816 return ret;
2817 }
2818
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2819 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2820 {
2821 struct nfs_server *server = NFS_SERVER(state->inode);
2822 struct nfs4_exception exception = { };
2823 int err;
2824
2825 do {
2826 err = _nfs4_open_expired(ctx, state);
2827 trace_nfs4_open_expired(ctx, 0, err);
2828 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2829 continue;
2830 switch (err) {
2831 default:
2832 goto out;
2833 case -NFS4ERR_GRACE:
2834 case -NFS4ERR_DELAY:
2835 nfs4_handle_exception(server, err, &exception);
2836 err = 0;
2837 }
2838 } while (exception.retry);
2839 out:
2840 return err;
2841 }
2842
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2843 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2844 {
2845 struct nfs_open_context *ctx;
2846 int ret;
2847
2848 ctx = nfs4_state_find_open_context(state);
2849 if (IS_ERR(ctx))
2850 return -EAGAIN;
2851 ret = nfs4_do_open_expired(ctx, state);
2852 put_nfs_open_context(ctx);
2853 return ret;
2854 }
2855
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2856 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2857 const nfs4_stateid *stateid)
2858 {
2859 nfs_remove_bad_delegation(state->inode, stateid);
2860 nfs_state_clear_delegation(state);
2861 }
2862
nfs40_clear_delegation_stateid(struct nfs4_state * state)2863 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2864 {
2865 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2866 nfs_finish_clear_delegation_stateid(state, NULL);
2867 }
2868
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2869 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2870 {
2871 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2872 nfs40_clear_delegation_stateid(state);
2873 nfs_state_clear_open_state_flags(state);
2874 return nfs4_open_expired(sp, state);
2875 }
2876
nfs40_test_and_free_expired_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)2877 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2878 const nfs4_stateid *stateid,
2879 const struct cred *cred)
2880 {
2881 return -NFS4ERR_BAD_STATEID;
2882 }
2883
2884 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)2885 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2886 const nfs4_stateid *stateid,
2887 const struct cred *cred)
2888 {
2889 int status;
2890
2891 switch (stateid->type) {
2892 default:
2893 break;
2894 case NFS4_INVALID_STATEID_TYPE:
2895 case NFS4_SPECIAL_STATEID_TYPE:
2896 return -NFS4ERR_BAD_STATEID;
2897 case NFS4_REVOKED_STATEID_TYPE:
2898 goto out_free;
2899 }
2900
2901 status = nfs41_test_stateid(server, stateid, cred);
2902 switch (status) {
2903 case -NFS4ERR_EXPIRED:
2904 case -NFS4ERR_ADMIN_REVOKED:
2905 case -NFS4ERR_DELEG_REVOKED:
2906 break;
2907 default:
2908 return status;
2909 }
2910 out_free:
2911 /* Ack the revoked state to the server */
2912 nfs41_free_stateid(server, stateid, cred, true);
2913 return -NFS4ERR_EXPIRED;
2914 }
2915
nfs41_check_delegation_stateid(struct nfs4_state * state)2916 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2917 {
2918 struct nfs_server *server = NFS_SERVER(state->inode);
2919 nfs4_stateid stateid;
2920 struct nfs_delegation *delegation;
2921 const struct cred *cred = NULL;
2922 int status, ret = NFS_OK;
2923
2924 /* Get the delegation credential for use by test/free_stateid */
2925 rcu_read_lock();
2926 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2927 if (delegation == NULL) {
2928 rcu_read_unlock();
2929 nfs_state_clear_delegation(state);
2930 return NFS_OK;
2931 }
2932
2933 spin_lock(&delegation->lock);
2934 nfs4_stateid_copy(&stateid, &delegation->stateid);
2935
2936 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2937 &delegation->flags)) {
2938 spin_unlock(&delegation->lock);
2939 rcu_read_unlock();
2940 return NFS_OK;
2941 }
2942
2943 if (delegation->cred)
2944 cred = get_cred(delegation->cred);
2945 spin_unlock(&delegation->lock);
2946 rcu_read_unlock();
2947 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2948 trace_nfs4_test_delegation_stateid(state, NULL, status);
2949 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2950 nfs_finish_clear_delegation_stateid(state, &stateid);
2951 else
2952 ret = status;
2953
2954 put_cred(cred);
2955 return ret;
2956 }
2957
nfs41_delegation_recover_stateid(struct nfs4_state * state)2958 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2959 {
2960 nfs4_stateid tmp;
2961
2962 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2963 nfs4_copy_delegation_stateid(state->inode, state->state,
2964 &tmp, NULL) &&
2965 nfs4_stateid_match_other(&state->stateid, &tmp))
2966 nfs_state_set_delegation(state, &tmp, state->state);
2967 else
2968 nfs_state_clear_delegation(state);
2969 }
2970
2971 /**
2972 * nfs41_check_expired_locks - possibly free a lock stateid
2973 *
2974 * @state: NFSv4 state for an inode
2975 *
2976 * Returns NFS_OK if recovery for this stateid is now finished.
2977 * Otherwise a negative NFS4ERR value is returned.
2978 */
nfs41_check_expired_locks(struct nfs4_state * state)2979 static int nfs41_check_expired_locks(struct nfs4_state *state)
2980 {
2981 int status, ret = NFS_OK;
2982 struct nfs4_lock_state *lsp, *prev = NULL;
2983 struct nfs_server *server = NFS_SERVER(state->inode);
2984
2985 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2986 goto out;
2987
2988 spin_lock(&state->state_lock);
2989 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2990 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2991 const struct cred *cred = lsp->ls_state->owner->so_cred;
2992
2993 refcount_inc(&lsp->ls_count);
2994 spin_unlock(&state->state_lock);
2995
2996 nfs4_put_lock_state(prev);
2997 prev = lsp;
2998
2999 status = nfs41_test_and_free_expired_stateid(server,
3000 &lsp->ls_stateid,
3001 cred);
3002 trace_nfs4_test_lock_stateid(state, lsp, status);
3003 if (status == -NFS4ERR_EXPIRED ||
3004 status == -NFS4ERR_BAD_STATEID) {
3005 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
3006 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
3007 if (!recover_lost_locks)
3008 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
3009 } else if (status != NFS_OK) {
3010 ret = status;
3011 nfs4_put_lock_state(prev);
3012 goto out;
3013 }
3014 spin_lock(&state->state_lock);
3015 }
3016 }
3017 spin_unlock(&state->state_lock);
3018 nfs4_put_lock_state(prev);
3019 out:
3020 return ret;
3021 }
3022
3023 /**
3024 * nfs41_check_open_stateid - possibly free an open stateid
3025 *
3026 * @state: NFSv4 state for an inode
3027 *
3028 * Returns NFS_OK if recovery for this stateid is now finished.
3029 * Otherwise a negative NFS4ERR value is returned.
3030 */
nfs41_check_open_stateid(struct nfs4_state * state)3031 static int nfs41_check_open_stateid(struct nfs4_state *state)
3032 {
3033 struct nfs_server *server = NFS_SERVER(state->inode);
3034 nfs4_stateid *stateid = &state->open_stateid;
3035 const struct cred *cred = state->owner->so_cred;
3036 int status;
3037
3038 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3039 return -NFS4ERR_BAD_STATEID;
3040 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
3041 trace_nfs4_test_open_stateid(state, NULL, status);
3042 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
3043 nfs_state_clear_open_state_flags(state);
3044 stateid->type = NFS4_INVALID_STATEID_TYPE;
3045 return status;
3046 }
3047 if (nfs_open_stateid_recover_openmode(state))
3048 return -NFS4ERR_OPENMODE;
3049 return NFS_OK;
3050 }
3051
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)3052 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3053 {
3054 int status;
3055
3056 status = nfs41_check_delegation_stateid(state);
3057 if (status != NFS_OK)
3058 return status;
3059 nfs41_delegation_recover_stateid(state);
3060
3061 status = nfs41_check_expired_locks(state);
3062 if (status != NFS_OK)
3063 return status;
3064 status = nfs41_check_open_stateid(state);
3065 if (status != NFS_OK)
3066 status = nfs4_open_expired(sp, state);
3067 return status;
3068 }
3069 #endif
3070
3071 /*
3072 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3073 * fields corresponding to attributes that were used to store the verifier.
3074 * Make sure we clobber those fields in the later setattr call
3075 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3076 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3077 struct iattr *sattr, struct nfs4_label **label)
3078 {
3079 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3080 __u32 attrset[3];
3081 unsigned ret;
3082 unsigned i;
3083
3084 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3085 attrset[i] = opendata->o_res.attrset[i];
3086 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3087 attrset[i] &= ~bitmask[i];
3088 }
3089
3090 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3091 sattr->ia_valid : 0;
3092
3093 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3094 if (sattr->ia_valid & ATTR_ATIME_SET)
3095 ret |= ATTR_ATIME_SET;
3096 else
3097 ret |= ATTR_ATIME;
3098 }
3099
3100 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3101 if (sattr->ia_valid & ATTR_MTIME_SET)
3102 ret |= ATTR_MTIME_SET;
3103 else
3104 ret |= ATTR_MTIME;
3105 }
3106
3107 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3108 *label = NULL;
3109 return ret;
3110 }
3111
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3112 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3113 struct nfs_open_context *ctx)
3114 {
3115 struct nfs4_state_owner *sp = opendata->owner;
3116 struct nfs_server *server = sp->so_server;
3117 struct dentry *dentry;
3118 struct nfs4_state *state;
3119 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3120 struct inode *dir = d_inode(opendata->dir);
3121 unsigned long dir_verifier;
3122 int ret;
3123
3124 dir_verifier = nfs_save_change_attribute(dir);
3125
3126 ret = _nfs4_proc_open(opendata, ctx);
3127 if (ret != 0)
3128 goto out;
3129
3130 state = _nfs4_opendata_to_nfs4_state(opendata);
3131 ret = PTR_ERR(state);
3132 if (IS_ERR(state))
3133 goto out;
3134 ctx->state = state;
3135 if (server->caps & NFS_CAP_POSIX_LOCK)
3136 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3137 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3138 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3139 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3140 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3141
3142 dentry = opendata->dentry;
3143 if (d_really_is_negative(dentry)) {
3144 struct dentry *alias;
3145 d_drop(dentry);
3146 alias = d_exact_alias(dentry, state->inode);
3147 if (!alias)
3148 alias = d_splice_alias(igrab(state->inode), dentry);
3149 /* d_splice_alias() can't fail here - it's a non-directory */
3150 if (alias) {
3151 dput(ctx->dentry);
3152 ctx->dentry = dentry = alias;
3153 }
3154 }
3155
3156 switch(opendata->o_arg.claim) {
3157 default:
3158 break;
3159 case NFS4_OPEN_CLAIM_NULL:
3160 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3161 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3162 if (!opendata->rpc_done)
3163 break;
3164 if (opendata->o_res.delegation.type != 0)
3165 dir_verifier = nfs_save_change_attribute(dir);
3166 nfs_set_verifier(dentry, dir_verifier);
3167 }
3168
3169 /* Parse layoutget results before we check for access */
3170 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3171
3172 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3173 if (ret != 0)
3174 goto out;
3175
3176 if (d_inode(dentry) == state->inode)
3177 nfs_inode_attach_open_context(ctx);
3178
3179 out:
3180 if (!opendata->cancelled) {
3181 if (opendata->lgp) {
3182 nfs4_lgopen_release(opendata->lgp);
3183 opendata->lgp = NULL;
3184 }
3185 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3186 }
3187 return ret;
3188 }
3189
3190 /*
3191 * Returns a referenced nfs4_state
3192 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3193 static int _nfs4_do_open(struct inode *dir,
3194 struct nfs_open_context *ctx,
3195 int flags,
3196 const struct nfs4_open_createattrs *c,
3197 int *opened)
3198 {
3199 struct nfs4_state_owner *sp;
3200 struct nfs4_state *state = NULL;
3201 struct nfs_server *server = NFS_SERVER(dir);
3202 struct nfs4_opendata *opendata;
3203 struct dentry *dentry = ctx->dentry;
3204 const struct cred *cred = ctx->cred;
3205 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3206 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3207 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3208 struct iattr *sattr = c->sattr;
3209 struct nfs4_label *label = c->label;
3210 int status;
3211
3212 /* Protect against reboot recovery conflicts */
3213 status = -ENOMEM;
3214 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3215 if (sp == NULL) {
3216 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3217 goto out_err;
3218 }
3219 status = nfs4_client_recover_expired_lease(server->nfs_client);
3220 if (status != 0)
3221 goto err_put_state_owner;
3222 if (d_really_is_positive(dentry))
3223 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3224 status = -ENOMEM;
3225 if (d_really_is_positive(dentry))
3226 claim = NFS4_OPEN_CLAIM_FH;
3227 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3228 c, claim, GFP_KERNEL);
3229 if (opendata == NULL)
3230 goto err_put_state_owner;
3231
3232 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3233 if (!opendata->f_attr.mdsthreshold) {
3234 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3235 if (!opendata->f_attr.mdsthreshold)
3236 goto err_opendata_put;
3237 }
3238 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3239 }
3240 if (d_really_is_positive(dentry))
3241 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3242
3243 status = _nfs4_open_and_get_state(opendata, ctx);
3244 if (status != 0)
3245 goto err_opendata_put;
3246 state = ctx->state;
3247
3248 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3249 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3250 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3251 /*
3252 * send create attributes which was not set by open
3253 * with an extra setattr.
3254 */
3255 if (attrs || label) {
3256 unsigned ia_old = sattr->ia_valid;
3257
3258 sattr->ia_valid = attrs;
3259 nfs_fattr_init(opendata->o_res.f_attr);
3260 status = nfs4_do_setattr(state->inode, cred,
3261 opendata->o_res.f_attr, sattr,
3262 ctx, label);
3263 if (status == 0) {
3264 nfs_setattr_update_inode(state->inode, sattr,
3265 opendata->o_res.f_attr);
3266 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3267 }
3268 sattr->ia_valid = ia_old;
3269 }
3270 }
3271 if (opened && opendata->file_created)
3272 *opened = 1;
3273
3274 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3275 *ctx_th = opendata->f_attr.mdsthreshold;
3276 opendata->f_attr.mdsthreshold = NULL;
3277 }
3278
3279 nfs4_opendata_put(opendata);
3280 nfs4_put_state_owner(sp);
3281 return 0;
3282 err_opendata_put:
3283 nfs4_opendata_put(opendata);
3284 err_put_state_owner:
3285 nfs4_put_state_owner(sp);
3286 out_err:
3287 return status;
3288 }
3289
3290
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3291 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3292 struct nfs_open_context *ctx,
3293 int flags,
3294 struct iattr *sattr,
3295 struct nfs4_label *label,
3296 int *opened)
3297 {
3298 struct nfs_server *server = NFS_SERVER(dir);
3299 struct nfs4_exception exception = {
3300 .interruptible = true,
3301 };
3302 struct nfs4_state *res;
3303 struct nfs4_open_createattrs c = {
3304 .label = label,
3305 .sattr = sattr,
3306 .verf = {
3307 [0] = (__u32)jiffies,
3308 [1] = (__u32)current->pid,
3309 },
3310 };
3311 int status;
3312
3313 do {
3314 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3315 res = ctx->state;
3316 trace_nfs4_open_file(ctx, flags, status);
3317 if (status == 0)
3318 break;
3319 /* NOTE: BAD_SEQID means the server and client disagree about the
3320 * book-keeping w.r.t. state-changing operations
3321 * (OPEN/CLOSE/LOCK/LOCKU...)
3322 * It is actually a sign of a bug on the client or on the server.
3323 *
3324 * If we receive a BAD_SEQID error in the particular case of
3325 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3326 * have unhashed the old state_owner for us, and that we can
3327 * therefore safely retry using a new one. We should still warn
3328 * the user though...
3329 */
3330 if (status == -NFS4ERR_BAD_SEQID) {
3331 pr_warn_ratelimited("NFS: v4 server %s "
3332 " returned a bad sequence-id error!\n",
3333 NFS_SERVER(dir)->nfs_client->cl_hostname);
3334 exception.retry = 1;
3335 continue;
3336 }
3337 /*
3338 * BAD_STATEID on OPEN means that the server cancelled our
3339 * state before it received the OPEN_CONFIRM.
3340 * Recover by retrying the request as per the discussion
3341 * on Page 181 of RFC3530.
3342 */
3343 if (status == -NFS4ERR_BAD_STATEID) {
3344 exception.retry = 1;
3345 continue;
3346 }
3347 if (status == -NFS4ERR_EXPIRED) {
3348 nfs4_schedule_lease_recovery(server->nfs_client);
3349 exception.retry = 1;
3350 continue;
3351 }
3352 if (status == -EAGAIN) {
3353 /* We must have found a delegation */
3354 exception.retry = 1;
3355 continue;
3356 }
3357 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3358 continue;
3359 res = ERR_PTR(nfs4_handle_exception(server,
3360 status, &exception));
3361 } while (exception.retry);
3362 return res;
3363 }
3364
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3365 static int _nfs4_do_setattr(struct inode *inode,
3366 struct nfs_setattrargs *arg,
3367 struct nfs_setattrres *res,
3368 const struct cred *cred,
3369 struct nfs_open_context *ctx)
3370 {
3371 struct nfs_server *server = NFS_SERVER(inode);
3372 struct rpc_message msg = {
3373 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3374 .rpc_argp = arg,
3375 .rpc_resp = res,
3376 .rpc_cred = cred,
3377 };
3378 const struct cred *delegation_cred = NULL;
3379 unsigned long timestamp = jiffies;
3380 bool truncate;
3381 int status;
3382
3383 nfs_fattr_init(res->fattr);
3384
3385 /* Servers should only apply open mode checks for file size changes */
3386 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3387 if (!truncate) {
3388 nfs4_inode_make_writeable(inode);
3389 goto zero_stateid;
3390 }
3391
3392 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3393 /* Use that stateid */
3394 } else if (ctx != NULL && ctx->state) {
3395 struct nfs_lock_context *l_ctx;
3396 if (!nfs4_valid_open_stateid(ctx->state))
3397 return -EBADF;
3398 l_ctx = nfs_get_lock_context(ctx);
3399 if (IS_ERR(l_ctx))
3400 return PTR_ERR(l_ctx);
3401 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3402 &arg->stateid, &delegation_cred);
3403 nfs_put_lock_context(l_ctx);
3404 if (status == -EIO)
3405 return -EBADF;
3406 else if (status == -EAGAIN)
3407 goto zero_stateid;
3408 } else {
3409 zero_stateid:
3410 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3411 }
3412 if (delegation_cred)
3413 msg.rpc_cred = delegation_cred;
3414
3415 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3416
3417 put_cred(delegation_cred);
3418 if (status == 0 && ctx != NULL)
3419 renew_lease(server, timestamp);
3420 trace_nfs4_setattr(inode, &arg->stateid, status);
3421 return status;
3422 }
3423
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel)3424 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3425 struct nfs_fattr *fattr, struct iattr *sattr,
3426 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3427 {
3428 struct nfs_server *server = NFS_SERVER(inode);
3429 __u32 bitmask[NFS4_BITMASK_SZ];
3430 struct nfs4_state *state = ctx ? ctx->state : NULL;
3431 struct nfs_setattrargs arg = {
3432 .fh = NFS_FH(inode),
3433 .iap = sattr,
3434 .server = server,
3435 .bitmask = bitmask,
3436 .label = ilabel,
3437 };
3438 struct nfs_setattrres res = {
3439 .fattr = fattr,
3440 .server = server,
3441 };
3442 struct nfs4_exception exception = {
3443 .state = state,
3444 .inode = inode,
3445 .stateid = &arg.stateid,
3446 };
3447 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3448 NFS_INO_INVALID_CTIME;
3449 int err;
3450
3451 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3452 adjust_flags |= NFS_INO_INVALID_MODE;
3453 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3454 adjust_flags |= NFS_INO_INVALID_OTHER;
3455 if (sattr->ia_valid & ATTR_ATIME)
3456 adjust_flags |= NFS_INO_INVALID_ATIME;
3457 if (sattr->ia_valid & ATTR_MTIME)
3458 adjust_flags |= NFS_INO_INVALID_MTIME;
3459
3460 do {
3461 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3462 inode, adjust_flags);
3463
3464 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3465 switch (err) {
3466 case -NFS4ERR_OPENMODE:
3467 if (!(sattr->ia_valid & ATTR_SIZE)) {
3468 pr_warn_once("NFSv4: server %s is incorrectly "
3469 "applying open mode checks to "
3470 "a SETATTR that is not "
3471 "changing file size.\n",
3472 server->nfs_client->cl_hostname);
3473 }
3474 if (state && !(state->state & FMODE_WRITE)) {
3475 err = -EBADF;
3476 if (sattr->ia_valid & ATTR_OPEN)
3477 err = -EACCES;
3478 goto out;
3479 }
3480 }
3481 err = nfs4_handle_exception(server, err, &exception);
3482 } while (exception.retry);
3483 out:
3484 return err;
3485 }
3486
3487 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3488 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3489 {
3490 if (inode == NULL || !nfs_have_layout(inode))
3491 return false;
3492
3493 return pnfs_wait_on_layoutreturn(inode, task);
3494 }
3495
3496 /*
3497 * Update the seqid of an open stateid
3498 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3499 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3500 struct nfs4_state *state)
3501 {
3502 __be32 seqid_open;
3503 u32 dst_seqid;
3504 int seq;
3505
3506 for (;;) {
3507 if (!nfs4_valid_open_stateid(state))
3508 break;
3509 seq = read_seqbegin(&state->seqlock);
3510 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3511 nfs4_stateid_copy(dst, &state->open_stateid);
3512 if (read_seqretry(&state->seqlock, seq))
3513 continue;
3514 break;
3515 }
3516 seqid_open = state->open_stateid.seqid;
3517 if (read_seqretry(&state->seqlock, seq))
3518 continue;
3519
3520 dst_seqid = be32_to_cpu(dst->seqid);
3521 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3522 dst->seqid = seqid_open;
3523 break;
3524 }
3525 }
3526
3527 /*
3528 * Update the seqid of an open stateid after receiving
3529 * NFS4ERR_OLD_STATEID
3530 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3531 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3532 struct nfs4_state *state)
3533 {
3534 __be32 seqid_open;
3535 u32 dst_seqid;
3536 bool ret;
3537 int seq, status = -EAGAIN;
3538 DEFINE_WAIT(wait);
3539
3540 for (;;) {
3541 ret = false;
3542 if (!nfs4_valid_open_stateid(state))
3543 break;
3544 seq = read_seqbegin(&state->seqlock);
3545 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3546 if (read_seqretry(&state->seqlock, seq))
3547 continue;
3548 break;
3549 }
3550
3551 write_seqlock(&state->seqlock);
3552 seqid_open = state->open_stateid.seqid;
3553
3554 dst_seqid = be32_to_cpu(dst->seqid);
3555
3556 /* Did another OPEN bump the state's seqid? try again: */
3557 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3558 dst->seqid = seqid_open;
3559 write_sequnlock(&state->seqlock);
3560 ret = true;
3561 break;
3562 }
3563
3564 /* server says we're behind but we haven't seen the update yet */
3565 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3566 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3567 write_sequnlock(&state->seqlock);
3568 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3569
3570 if (fatal_signal_pending(current))
3571 status = -EINTR;
3572 else
3573 if (schedule_timeout(5*HZ) != 0)
3574 status = 0;
3575
3576 finish_wait(&state->waitq, &wait);
3577
3578 if (!status)
3579 continue;
3580 if (status == -EINTR)
3581 break;
3582
3583 /* we slept the whole 5 seconds, we must have lost a seqid */
3584 dst->seqid = cpu_to_be32(dst_seqid + 1);
3585 ret = true;
3586 break;
3587 }
3588
3589 return ret;
3590 }
3591
3592 struct nfs4_closedata {
3593 struct inode *inode;
3594 struct nfs4_state *state;
3595 struct nfs_closeargs arg;
3596 struct nfs_closeres res;
3597 struct {
3598 struct nfs4_layoutreturn_args arg;
3599 struct nfs4_layoutreturn_res res;
3600 struct nfs4_xdr_opaque_data ld_private;
3601 u32 roc_barrier;
3602 bool roc;
3603 } lr;
3604 struct nfs_fattr fattr;
3605 unsigned long timestamp;
3606 };
3607
nfs4_free_closedata(void * data)3608 static void nfs4_free_closedata(void *data)
3609 {
3610 struct nfs4_closedata *calldata = data;
3611 struct nfs4_state_owner *sp = calldata->state->owner;
3612 struct super_block *sb = calldata->state->inode->i_sb;
3613
3614 if (calldata->lr.roc)
3615 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3616 calldata->res.lr_ret);
3617 nfs4_put_open_state(calldata->state);
3618 nfs_free_seqid(calldata->arg.seqid);
3619 nfs4_put_state_owner(sp);
3620 nfs_sb_deactive(sb);
3621 kfree(calldata);
3622 }
3623
nfs4_close_done(struct rpc_task * task,void * data)3624 static void nfs4_close_done(struct rpc_task *task, void *data)
3625 {
3626 struct nfs4_closedata *calldata = data;
3627 struct nfs4_state *state = calldata->state;
3628 struct nfs_server *server = NFS_SERVER(calldata->inode);
3629 nfs4_stateid *res_stateid = NULL;
3630 struct nfs4_exception exception = {
3631 .state = state,
3632 .inode = calldata->inode,
3633 .stateid = &calldata->arg.stateid,
3634 };
3635
3636 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3637 return;
3638 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3639
3640 /* Handle Layoutreturn errors */
3641 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3642 &calldata->res.lr_ret) == -EAGAIN)
3643 goto out_restart;
3644
3645 /* hmm. we are done with the inode, and in the process of freeing
3646 * the state_owner. we keep this around to process errors
3647 */
3648 switch (task->tk_status) {
3649 case 0:
3650 res_stateid = &calldata->res.stateid;
3651 renew_lease(server, calldata->timestamp);
3652 break;
3653 case -NFS4ERR_ACCESS:
3654 if (calldata->arg.bitmask != NULL) {
3655 calldata->arg.bitmask = NULL;
3656 calldata->res.fattr = NULL;
3657 goto out_restart;
3658
3659 }
3660 break;
3661 case -NFS4ERR_OLD_STATEID:
3662 /* Did we race with OPEN? */
3663 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3664 state))
3665 goto out_restart;
3666 goto out_release;
3667 case -NFS4ERR_ADMIN_REVOKED:
3668 case -NFS4ERR_STALE_STATEID:
3669 case -NFS4ERR_EXPIRED:
3670 nfs4_free_revoked_stateid(server,
3671 &calldata->arg.stateid,
3672 task->tk_msg.rpc_cred);
3673 fallthrough;
3674 case -NFS4ERR_BAD_STATEID:
3675 if (calldata->arg.fmode == 0)
3676 break;
3677 fallthrough;
3678 default:
3679 task->tk_status = nfs4_async_handle_exception(task,
3680 server, task->tk_status, &exception);
3681 if (exception.retry)
3682 goto out_restart;
3683 }
3684 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3685 res_stateid, calldata->arg.fmode);
3686 out_release:
3687 task->tk_status = 0;
3688 nfs_release_seqid(calldata->arg.seqid);
3689 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3690 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3691 return;
3692 out_restart:
3693 task->tk_status = 0;
3694 rpc_restart_call_prepare(task);
3695 goto out_release;
3696 }
3697
nfs4_close_prepare(struct rpc_task * task,void * data)3698 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3699 {
3700 struct nfs4_closedata *calldata = data;
3701 struct nfs4_state *state = calldata->state;
3702 struct inode *inode = calldata->inode;
3703 struct nfs_server *server = NFS_SERVER(inode);
3704 struct pnfs_layout_hdr *lo;
3705 bool is_rdonly, is_wronly, is_rdwr;
3706 int call_close = 0;
3707
3708 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3709 goto out_wait;
3710
3711 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3712 spin_lock(&state->owner->so_lock);
3713 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3714 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3715 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3716 /* Calculate the change in open mode */
3717 calldata->arg.fmode = 0;
3718 if (state->n_rdwr == 0) {
3719 if (state->n_rdonly == 0)
3720 call_close |= is_rdonly;
3721 else if (is_rdonly)
3722 calldata->arg.fmode |= FMODE_READ;
3723 if (state->n_wronly == 0)
3724 call_close |= is_wronly;
3725 else if (is_wronly)
3726 calldata->arg.fmode |= FMODE_WRITE;
3727 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3728 call_close |= is_rdwr;
3729 } else if (is_rdwr)
3730 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3731
3732 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3733 if (!nfs4_valid_open_stateid(state))
3734 call_close = 0;
3735 spin_unlock(&state->owner->so_lock);
3736
3737 if (!call_close) {
3738 /* Note: exit _without_ calling nfs4_close_done */
3739 goto out_no_action;
3740 }
3741
3742 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3743 nfs_release_seqid(calldata->arg.seqid);
3744 goto out_wait;
3745 }
3746
3747 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3748 if (lo && !pnfs_layout_is_valid(lo)) {
3749 calldata->arg.lr_args = NULL;
3750 calldata->res.lr_res = NULL;
3751 }
3752
3753 if (calldata->arg.fmode == 0)
3754 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3755
3756 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3757 /* Close-to-open cache consistency revalidation */
3758 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3759 nfs4_bitmask_set(calldata->arg.bitmask_store,
3760 server->cache_consistency_bitmask,
3761 inode, 0);
3762 calldata->arg.bitmask = calldata->arg.bitmask_store;
3763 } else
3764 calldata->arg.bitmask = NULL;
3765 }
3766
3767 calldata->arg.share_access =
3768 nfs4_fmode_to_share_access(calldata->arg.fmode);
3769
3770 if (calldata->res.fattr == NULL)
3771 calldata->arg.bitmask = NULL;
3772 else if (calldata->arg.bitmask == NULL)
3773 calldata->res.fattr = NULL;
3774 calldata->timestamp = jiffies;
3775 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3776 &calldata->arg.seq_args,
3777 &calldata->res.seq_res,
3778 task) != 0)
3779 nfs_release_seqid(calldata->arg.seqid);
3780 return;
3781 out_no_action:
3782 task->tk_action = NULL;
3783 out_wait:
3784 nfs4_sequence_done(task, &calldata->res.seq_res);
3785 }
3786
3787 static const struct rpc_call_ops nfs4_close_ops = {
3788 .rpc_call_prepare = nfs4_close_prepare,
3789 .rpc_call_done = nfs4_close_done,
3790 .rpc_release = nfs4_free_closedata,
3791 };
3792
3793 /*
3794 * It is possible for data to be read/written from a mem-mapped file
3795 * after the sys_close call (which hits the vfs layer as a flush).
3796 * This means that we can't safely call nfsv4 close on a file until
3797 * the inode is cleared. This in turn means that we are not good
3798 * NFSv4 citizens - we do not indicate to the server to update the file's
3799 * share state even when we are done with one of the three share
3800 * stateid's in the inode.
3801 *
3802 * NOTE: Caller must be holding the sp->so_owner semaphore!
3803 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3804 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3805 {
3806 struct nfs_server *server = NFS_SERVER(state->inode);
3807 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3808 struct nfs4_closedata *calldata;
3809 struct nfs4_state_owner *sp = state->owner;
3810 struct rpc_task *task;
3811 struct rpc_message msg = {
3812 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3813 .rpc_cred = state->owner->so_cred,
3814 };
3815 struct rpc_task_setup task_setup_data = {
3816 .rpc_client = server->client,
3817 .rpc_message = &msg,
3818 .callback_ops = &nfs4_close_ops,
3819 .workqueue = nfsiod_workqueue,
3820 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3821 };
3822 int status = -ENOMEM;
3823
3824 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3825 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3826
3827 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3828 &task_setup_data.rpc_client, &msg);
3829
3830 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3831 if (calldata == NULL)
3832 goto out;
3833 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3834 calldata->inode = state->inode;
3835 calldata->state = state;
3836 calldata->arg.fh = NFS_FH(state->inode);
3837 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3838 goto out_free_calldata;
3839 /* Serialization for the sequence id */
3840 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3841 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3842 if (IS_ERR(calldata->arg.seqid))
3843 goto out_free_calldata;
3844 nfs_fattr_init(&calldata->fattr);
3845 calldata->arg.fmode = 0;
3846 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3847 calldata->res.fattr = &calldata->fattr;
3848 calldata->res.seqid = calldata->arg.seqid;
3849 calldata->res.server = server;
3850 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3851 calldata->lr.roc = pnfs_roc(state->inode,
3852 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3853 if (calldata->lr.roc) {
3854 calldata->arg.lr_args = &calldata->lr.arg;
3855 calldata->res.lr_res = &calldata->lr.res;
3856 }
3857 nfs_sb_active(calldata->inode->i_sb);
3858
3859 msg.rpc_argp = &calldata->arg;
3860 msg.rpc_resp = &calldata->res;
3861 task_setup_data.callback_data = calldata;
3862 task = rpc_run_task(&task_setup_data);
3863 if (IS_ERR(task))
3864 return PTR_ERR(task);
3865 status = 0;
3866 if (wait)
3867 status = rpc_wait_for_completion_task(task);
3868 rpc_put_task(task);
3869 return status;
3870 out_free_calldata:
3871 kfree(calldata);
3872 out:
3873 nfs4_put_open_state(state);
3874 nfs4_put_state_owner(sp);
3875 return status;
3876 }
3877
3878 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3879 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3880 int open_flags, struct iattr *attr, int *opened)
3881 {
3882 struct nfs4_state *state;
3883 struct nfs4_label l, *label;
3884
3885 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3886
3887 /* Protect against concurrent sillydeletes */
3888 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3889
3890 nfs4_label_release_security(label);
3891
3892 if (IS_ERR(state))
3893 return ERR_CAST(state);
3894 return state->inode;
3895 }
3896
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3897 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3898 {
3899 if (ctx->state == NULL)
3900 return;
3901 if (is_sync)
3902 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3903 else
3904 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3905 }
3906
3907 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3908 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3909 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL)
3910
3911 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \
3912 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS)
nfs4_server_delegtime_capable(struct nfs4_server_caps_res * res)3913 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res)
3914 {
3915 u32 share_access_want = res->open_caps.oa_share_access_want[0];
3916 u32 attr_bitmask = res->attr_bitmask[2];
3917
3918 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) &&
3919 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) ==
3920 FATTR4_WORD2_NFS42_TIME_DELEG_MASK);
3921 }
3922
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3923 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3924 {
3925 u32 minorversion = server->nfs_client->cl_minorversion;
3926 u32 bitmask[3] = {
3927 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3928 };
3929 struct nfs4_server_caps_arg args = {
3930 .fhandle = fhandle,
3931 .bitmask = bitmask,
3932 };
3933 struct nfs4_server_caps_res res = {};
3934 struct rpc_message msg = {
3935 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3936 .rpc_argp = &args,
3937 .rpc_resp = &res,
3938 };
3939 int status;
3940 int i;
3941
3942 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3943 FATTR4_WORD0_FH_EXPIRE_TYPE |
3944 FATTR4_WORD0_LINK_SUPPORT |
3945 FATTR4_WORD0_SYMLINK_SUPPORT |
3946 FATTR4_WORD0_ACLSUPPORT |
3947 FATTR4_WORD0_CASE_INSENSITIVE |
3948 FATTR4_WORD0_CASE_PRESERVING;
3949 if (minorversion)
3950 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3951 FATTR4_WORD2_OPEN_ARGUMENTS;
3952
3953 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3954 if (status == 0) {
3955 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3956 FATTR4_WORD0_FH_EXPIRE_TYPE |
3957 FATTR4_WORD0_LINK_SUPPORT |
3958 FATTR4_WORD0_SYMLINK_SUPPORT |
3959 FATTR4_WORD0_ACLSUPPORT |
3960 FATTR4_WORD0_CASE_INSENSITIVE |
3961 FATTR4_WORD0_CASE_PRESERVING) &
3962 res.attr_bitmask[0];
3963 /* Sanity check the server answers */
3964 switch (minorversion) {
3965 case 0:
3966 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3967 res.attr_bitmask[2] = 0;
3968 break;
3969 case 1:
3970 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3971 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
3972 res.attr_bitmask[2];
3973 break;
3974 case 2:
3975 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3976 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3977 FATTR4_WORD2_OPEN_ARGUMENTS) &
3978 res.attr_bitmask[2];
3979 }
3980 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3981 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3982 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3983 server->fattr_valid = NFS_ATTR_FATTR_V4;
3984 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3985 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3986 server->caps |= NFS_CAP_ACLS;
3987 if (res.has_links != 0)
3988 server->caps |= NFS_CAP_HARDLINKS;
3989 if (res.has_symlinks != 0)
3990 server->caps |= NFS_CAP_SYMLINKS;
3991 if (res.case_insensitive)
3992 server->caps |= NFS_CAP_CASE_INSENSITIVE;
3993 if (res.case_preserving)
3994 server->caps |= NFS_CAP_CASE_PRESERVING;
3995 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3996 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3997 server->caps |= NFS_CAP_SECURITY_LABEL;
3998 #endif
3999 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
4000 server->caps |= NFS_CAP_FS_LOCATIONS;
4001 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
4002 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
4003 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
4004 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
4005 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
4006 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
4007 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
4008 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
4009 NFS_ATTR_FATTR_OWNER_NAME);
4010 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
4011 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
4012 NFS_ATTR_FATTR_GROUP_NAME);
4013 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
4014 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
4015 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
4016 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
4017 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
4018 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
4019 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4020 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4021 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
4022 sizeof(server->attr_bitmask));
4023 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4024
4025 if (res.open_caps.oa_share_access_want[0] &
4026 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
4027 server->caps |= NFS_CAP_OPEN_XOR;
4028 if (nfs4_server_delegtime_capable(&res))
4029 server->caps |= NFS_CAP_DELEGTIME;
4030
4031 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
4032 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
4033 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
4034 server->cache_consistency_bitmask[2] = 0;
4035
4036 /* Avoid a regression due to buggy server */
4037 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
4038 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
4039 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4040 sizeof(server->exclcreat_bitmask));
4041
4042 server->acl_bitmask = res.acl_bitmask;
4043 server->fh_expire_type = res.fh_expire_type;
4044 }
4045
4046 return status;
4047 }
4048
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)4049 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4050 {
4051 struct nfs4_exception exception = {
4052 .interruptible = true,
4053 };
4054 int err;
4055
4056 nfs4_server_set_init_caps(server);
4057 do {
4058 err = nfs4_handle_exception(server,
4059 _nfs4_server_capabilities(server, fhandle),
4060 &exception);
4061 } while (exception.retry);
4062 return err;
4063 }
4064
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)4065 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4066 struct nfs_client *clp,
4067 struct nfs_server *server)
4068 {
4069 int i;
4070
4071 for (i = 0; i < location->nservers; i++) {
4072 struct nfs4_string *srv_loc = &location->servers[i];
4073 struct sockaddr_storage addr;
4074 size_t addrlen;
4075 struct xprt_create xprt_args = {
4076 .ident = 0,
4077 .net = clp->cl_net,
4078 };
4079 struct nfs4_add_xprt_data xprtdata = {
4080 .clp = clp,
4081 };
4082 struct rpc_add_xprt_test rpcdata = {
4083 .add_xprt_test = clp->cl_mvops->session_trunk,
4084 .data = &xprtdata,
4085 };
4086 char *servername = NULL;
4087
4088 if (!srv_loc->len)
4089 continue;
4090
4091 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4092 &addr, sizeof(addr),
4093 clp->cl_net, server->port);
4094 if (!addrlen)
4095 return;
4096 xprt_args.dstaddr = (struct sockaddr *)&addr;
4097 xprt_args.addrlen = addrlen;
4098 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4099 if (!servername)
4100 return;
4101 memcpy(servername, srv_loc->data, srv_loc->len);
4102 servername[srv_loc->len] = '\0';
4103 xprt_args.servername = servername;
4104
4105 xprtdata.cred = nfs4_get_clid_cred(clp);
4106 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4107 rpc_clnt_setup_test_and_add_xprt,
4108 &rpcdata);
4109 if (xprtdata.cred)
4110 put_cred(xprtdata.cred);
4111 kfree(servername);
4112 }
4113 }
4114
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4115 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4116 struct nfs4_pathname *path2)
4117 {
4118 int i;
4119
4120 if (path1->ncomponents != path2->ncomponents)
4121 return false;
4122 for (i = 0; i < path1->ncomponents; i++) {
4123 if (path1->components[i].len != path2->components[i].len)
4124 return false;
4125 if (memcmp(path1->components[i].data, path2->components[i].data,
4126 path1->components[i].len))
4127 return false;
4128 }
4129 return true;
4130 }
4131
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4132 static int _nfs4_discover_trunking(struct nfs_server *server,
4133 struct nfs_fh *fhandle)
4134 {
4135 struct nfs4_fs_locations *locations = NULL;
4136 struct page *page;
4137 const struct cred *cred;
4138 struct nfs_client *clp = server->nfs_client;
4139 const struct nfs4_state_maintenance_ops *ops =
4140 clp->cl_mvops->state_renewal_ops;
4141 int status = -ENOMEM, i;
4142
4143 cred = ops->get_state_renewal_cred(clp);
4144 if (cred == NULL) {
4145 cred = nfs4_get_clid_cred(clp);
4146 if (cred == NULL)
4147 return -ENOKEY;
4148 }
4149
4150 page = alloc_page(GFP_KERNEL);
4151 if (!page)
4152 goto out_put_cred;
4153 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4154 if (!locations)
4155 goto out_free;
4156 locations->fattr = nfs_alloc_fattr();
4157 if (!locations->fattr)
4158 goto out_free_2;
4159
4160 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4161 cred);
4162 if (status)
4163 goto out_free_3;
4164
4165 for (i = 0; i < locations->nlocations; i++) {
4166 if (!_is_same_nfs4_pathname(&locations->fs_path,
4167 &locations->locations[i].rootpath))
4168 continue;
4169 test_fs_location_for_trunking(&locations->locations[i], clp,
4170 server);
4171 }
4172 out_free_3:
4173 kfree(locations->fattr);
4174 out_free_2:
4175 kfree(locations);
4176 out_free:
4177 __free_page(page);
4178 out_put_cred:
4179 put_cred(cred);
4180 return status;
4181 }
4182
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4183 static int nfs4_discover_trunking(struct nfs_server *server,
4184 struct nfs_fh *fhandle)
4185 {
4186 struct nfs4_exception exception = {
4187 .interruptible = true,
4188 };
4189 struct nfs_client *clp = server->nfs_client;
4190 int err = 0;
4191
4192 if (!nfs4_has_session(clp))
4193 goto out;
4194 do {
4195 err = nfs4_handle_exception(server,
4196 _nfs4_discover_trunking(server, fhandle),
4197 &exception);
4198 } while (exception.retry);
4199 out:
4200 return err;
4201 }
4202
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4203 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4204 struct nfs_fsinfo *info)
4205 {
4206 u32 bitmask[3];
4207 struct nfs4_lookup_root_arg args = {
4208 .bitmask = bitmask,
4209 };
4210 struct nfs4_lookup_res res = {
4211 .server = server,
4212 .fattr = info->fattr,
4213 .fh = fhandle,
4214 };
4215 struct rpc_message msg = {
4216 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4217 .rpc_argp = &args,
4218 .rpc_resp = &res,
4219 };
4220
4221 bitmask[0] = nfs4_fattr_bitmap[0];
4222 bitmask[1] = nfs4_fattr_bitmap[1];
4223 /*
4224 * Process the label in the upcoming getfattr
4225 */
4226 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4227
4228 nfs_fattr_init(info->fattr);
4229 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4230 }
4231
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4232 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4233 struct nfs_fsinfo *info)
4234 {
4235 struct nfs4_exception exception = {
4236 .interruptible = true,
4237 };
4238 int err;
4239 do {
4240 err = _nfs4_lookup_root(server, fhandle, info);
4241 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4242 switch (err) {
4243 case 0:
4244 case -NFS4ERR_WRONGSEC:
4245 goto out;
4246 default:
4247 err = nfs4_handle_exception(server, err, &exception);
4248 }
4249 } while (exception.retry);
4250 out:
4251 return err;
4252 }
4253
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,rpc_authflavor_t flavor)4254 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4255 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4256 {
4257 struct rpc_auth_create_args auth_args = {
4258 .pseudoflavor = flavor,
4259 };
4260 struct rpc_auth *auth;
4261
4262 auth = rpcauth_create(&auth_args, server->client);
4263 if (IS_ERR(auth))
4264 return -EACCES;
4265 return nfs4_lookup_root(server, fhandle, info);
4266 }
4267
4268 /*
4269 * Retry pseudoroot lookup with various security flavors. We do this when:
4270 *
4271 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4272 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4273 *
4274 * Returns zero on success, or a negative NFS4ERR value, or a
4275 * negative errno value.
4276 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4277 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4278 struct nfs_fsinfo *info)
4279 {
4280 /* Per 3530bis 15.33.5 */
4281 static const rpc_authflavor_t flav_array[] = {
4282 RPC_AUTH_GSS_KRB5P,
4283 RPC_AUTH_GSS_KRB5I,
4284 RPC_AUTH_GSS_KRB5,
4285 RPC_AUTH_UNIX, /* courtesy */
4286 RPC_AUTH_NULL,
4287 };
4288 int status = -EPERM;
4289 size_t i;
4290
4291 if (server->auth_info.flavor_len > 0) {
4292 /* try each flavor specified by user */
4293 for (i = 0; i < server->auth_info.flavor_len; i++) {
4294 status = nfs4_lookup_root_sec(server, fhandle, info,
4295 server->auth_info.flavors[i]);
4296 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4297 continue;
4298 break;
4299 }
4300 } else {
4301 /* no flavors specified by user, try default list */
4302 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4303 status = nfs4_lookup_root_sec(server, fhandle, info,
4304 flav_array[i]);
4305 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4306 continue;
4307 break;
4308 }
4309 }
4310
4311 /*
4312 * -EACCES could mean that the user doesn't have correct permissions
4313 * to access the mount. It could also mean that we tried to mount
4314 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4315 * existing mount programs don't handle -EACCES very well so it should
4316 * be mapped to -EPERM instead.
4317 */
4318 if (status == -EACCES)
4319 status = -EPERM;
4320 return status;
4321 }
4322
4323 /**
4324 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4325 * @server: initialized nfs_server handle
4326 * @fhandle: we fill in the pseudo-fs root file handle
4327 * @info: we fill in an FSINFO struct
4328 * @auth_probe: probe the auth flavours
4329 *
4330 * Returns zero on success, or a negative errno.
4331 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,bool auth_probe)4332 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4333 struct nfs_fsinfo *info,
4334 bool auth_probe)
4335 {
4336 int status = 0;
4337
4338 if (!auth_probe)
4339 status = nfs4_lookup_root(server, fhandle, info);
4340
4341 if (auth_probe || status == NFS4ERR_WRONGSEC)
4342 status = server->nfs_client->cl_mvops->find_root_sec(server,
4343 fhandle, info);
4344
4345 if (status == 0)
4346 status = nfs4_server_capabilities(server, fhandle);
4347 if (status == 0)
4348 status = nfs4_do_fsinfo(server, fhandle, info);
4349
4350 return nfs4_map_errors(status);
4351 }
4352
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4353 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4354 struct nfs_fsinfo *info)
4355 {
4356 int error;
4357 struct nfs_fattr *fattr = info->fattr;
4358
4359 error = nfs4_server_capabilities(server, mntfh);
4360 if (error < 0) {
4361 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4362 return error;
4363 }
4364
4365 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4366 if (error < 0) {
4367 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4368 goto out;
4369 }
4370
4371 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4372 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4373 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4374
4375 out:
4376 return error;
4377 }
4378
4379 /*
4380 * Get locations and (maybe) other attributes of a referral.
4381 * Note that we'll actually follow the referral later when
4382 * we detect fsid mismatch in inode revalidation
4383 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4384 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4385 const struct qstr *name, struct nfs_fattr *fattr,
4386 struct nfs_fh *fhandle)
4387 {
4388 int status = -ENOMEM;
4389 struct page *page = NULL;
4390 struct nfs4_fs_locations *locations = NULL;
4391
4392 page = alloc_page(GFP_KERNEL);
4393 if (page == NULL)
4394 goto out;
4395 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4396 if (locations == NULL)
4397 goto out;
4398
4399 locations->fattr = fattr;
4400
4401 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4402 if (status != 0)
4403 goto out;
4404
4405 /*
4406 * If the fsid didn't change, this is a migration event, not a
4407 * referral. Cause us to drop into the exception handler, which
4408 * will kick off migration recovery.
4409 */
4410 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4411 dprintk("%s: server did not return a different fsid for"
4412 " a referral at %s\n", __func__, name->name);
4413 status = -NFS4ERR_MOVED;
4414 goto out;
4415 }
4416 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4417 nfs_fixup_referral_attributes(fattr);
4418 memset(fhandle, 0, sizeof(struct nfs_fh));
4419 out:
4420 if (page)
4421 __free_page(page);
4422 kfree(locations);
4423 return status;
4424 }
4425
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4426 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4427 struct nfs_fattr *fattr, struct inode *inode)
4428 {
4429 __u32 bitmask[NFS4_BITMASK_SZ];
4430 struct nfs4_getattr_arg args = {
4431 .fh = fhandle,
4432 .bitmask = bitmask,
4433 };
4434 struct nfs4_getattr_res res = {
4435 .fattr = fattr,
4436 .server = server,
4437 };
4438 struct rpc_message msg = {
4439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4440 .rpc_argp = &args,
4441 .rpc_resp = &res,
4442 };
4443 unsigned short task_flags = 0;
4444
4445 if (nfs4_has_session(server->nfs_client))
4446 task_flags = RPC_TASK_MOVEABLE;
4447
4448 /* Is this is an attribute revalidation, subject to softreval? */
4449 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4450 task_flags |= RPC_TASK_TIMEOUT;
4451
4452 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4453 nfs_fattr_init(fattr);
4454 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4455 return nfs4_do_call_sync(server->client, server, &msg,
4456 &args.seq_args, &res.seq_res, task_flags);
4457 }
4458
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4459 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4460 struct nfs_fattr *fattr, struct inode *inode)
4461 {
4462 struct nfs4_exception exception = {
4463 .interruptible = true,
4464 };
4465 int err;
4466 do {
4467 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4468 trace_nfs4_getattr(server, fhandle, fattr, err);
4469 err = nfs4_handle_exception(server, err,
4470 &exception);
4471 } while (exception.retry);
4472 return err;
4473 }
4474
4475 /*
4476 * The file is not closed if it is opened due to the a request to change
4477 * the size of the file. The open call will not be needed once the
4478 * VFS layer lookup-intents are implemented.
4479 *
4480 * Close is called when the inode is destroyed.
4481 * If we haven't opened the file for O_WRONLY, we
4482 * need to in the size_change case to obtain a stateid.
4483 *
4484 * Got race?
4485 * Because OPEN is always done by name in nfsv4, it is
4486 * possible that we opened a different file by the same
4487 * name. We can recognize this race condition, but we
4488 * can't do anything about it besides returning an error.
4489 *
4490 * This will be fixed with VFS changes (lookup-intent).
4491 */
4492 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4493 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4494 struct iattr *sattr)
4495 {
4496 struct inode *inode = d_inode(dentry);
4497 const struct cred *cred = NULL;
4498 struct nfs_open_context *ctx = NULL;
4499 int status;
4500
4501 if (pnfs_ld_layoutret_on_setattr(inode) &&
4502 sattr->ia_valid & ATTR_SIZE &&
4503 sattr->ia_size < i_size_read(inode))
4504 pnfs_commit_and_return_layout(inode);
4505
4506 nfs_fattr_init(fattr);
4507
4508 /* Deal with open(O_TRUNC) */
4509 if (sattr->ia_valid & ATTR_OPEN)
4510 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4511
4512 /* Optimization: if the end result is no change, don't RPC */
4513 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4514 return 0;
4515
4516 /* Search for an existing open(O_WRITE) file */
4517 if (sattr->ia_valid & ATTR_FILE) {
4518
4519 ctx = nfs_file_open_context(sattr->ia_file);
4520 if (ctx)
4521 cred = ctx->cred;
4522 }
4523
4524 /* Return any delegations if we're going to change ACLs */
4525 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4526 nfs4_inode_make_writeable(inode);
4527
4528 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4529 if (status == 0) {
4530 nfs_setattr_update_inode(inode, sattr, fattr);
4531 nfs_setsecurity(inode, fattr);
4532 }
4533 return status;
4534 }
4535
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4536 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4537 struct dentry *dentry, struct nfs_fh *fhandle,
4538 struct nfs_fattr *fattr)
4539 {
4540 struct nfs_server *server = NFS_SERVER(dir);
4541 int status;
4542 struct nfs4_lookup_arg args = {
4543 .bitmask = server->attr_bitmask,
4544 .dir_fh = NFS_FH(dir),
4545 .name = &dentry->d_name,
4546 };
4547 struct nfs4_lookup_res res = {
4548 .server = server,
4549 .fattr = fattr,
4550 .fh = fhandle,
4551 };
4552 struct rpc_message msg = {
4553 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4554 .rpc_argp = &args,
4555 .rpc_resp = &res,
4556 };
4557 unsigned short task_flags = 0;
4558
4559 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4560 task_flags = RPC_TASK_MOVEABLE;
4561
4562 /* Is this is an attribute revalidation, subject to softreval? */
4563 if (nfs_lookup_is_soft_revalidate(dentry))
4564 task_flags |= RPC_TASK_TIMEOUT;
4565
4566 args.bitmask = nfs4_bitmask(server, fattr->label);
4567
4568 nfs_fattr_init(fattr);
4569
4570 dprintk("NFS call lookup %pd2\n", dentry);
4571 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4572 status = nfs4_do_call_sync(clnt, server, &msg,
4573 &args.seq_args, &res.seq_res, task_flags);
4574 dprintk("NFS reply lookup: %d\n", status);
4575 return status;
4576 }
4577
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4578 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4579 {
4580 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4581 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4582 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4583 fattr->nlink = 2;
4584 }
4585
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4586 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4587 struct dentry *dentry, struct nfs_fh *fhandle,
4588 struct nfs_fattr *fattr)
4589 {
4590 struct nfs4_exception exception = {
4591 .interruptible = true,
4592 };
4593 struct rpc_clnt *client = *clnt;
4594 const struct qstr *name = &dentry->d_name;
4595 int err;
4596 do {
4597 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4598 trace_nfs4_lookup(dir, name, err);
4599 switch (err) {
4600 case -NFS4ERR_BADNAME:
4601 err = -ENOENT;
4602 goto out;
4603 case -NFS4ERR_MOVED:
4604 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4605 if (err == -NFS4ERR_MOVED)
4606 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4607 goto out;
4608 case -NFS4ERR_WRONGSEC:
4609 err = -EPERM;
4610 if (client != *clnt)
4611 goto out;
4612 client = nfs4_negotiate_security(client, dir, name);
4613 if (IS_ERR(client))
4614 return PTR_ERR(client);
4615
4616 exception.retry = 1;
4617 break;
4618 default:
4619 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4620 }
4621 } while (exception.retry);
4622
4623 out:
4624 if (err == 0)
4625 *clnt = client;
4626 else if (client != *clnt)
4627 rpc_shutdown_client(client);
4628
4629 return err;
4630 }
4631
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4632 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4633 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4634 {
4635 int status;
4636 struct rpc_clnt *client = NFS_CLIENT(dir);
4637
4638 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4639 if (client != NFS_CLIENT(dir)) {
4640 rpc_shutdown_client(client);
4641 nfs_fixup_secinfo_attributes(fattr);
4642 }
4643 return status;
4644 }
4645
4646 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4647 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4648 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4649 {
4650 struct rpc_clnt *client = NFS_CLIENT(dir);
4651 int status;
4652
4653 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4654 if (status < 0)
4655 return ERR_PTR(status);
4656 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4657 }
4658
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4659 static int _nfs4_proc_lookupp(struct inode *inode,
4660 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4661 {
4662 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4663 struct nfs_server *server = NFS_SERVER(inode);
4664 int status;
4665 struct nfs4_lookupp_arg args = {
4666 .bitmask = server->attr_bitmask,
4667 .fh = NFS_FH(inode),
4668 };
4669 struct nfs4_lookupp_res res = {
4670 .server = server,
4671 .fattr = fattr,
4672 .fh = fhandle,
4673 };
4674 struct rpc_message msg = {
4675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4676 .rpc_argp = &args,
4677 .rpc_resp = &res,
4678 };
4679 unsigned short task_flags = 0;
4680
4681 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4682 task_flags |= RPC_TASK_TIMEOUT;
4683
4684 args.bitmask = nfs4_bitmask(server, fattr->label);
4685
4686 nfs_fattr_init(fattr);
4687
4688 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4689 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4690 &res.seq_res, task_flags);
4691 dprintk("NFS reply lookupp: %d\n", status);
4692 return status;
4693 }
4694
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4695 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4696 struct nfs_fattr *fattr)
4697 {
4698 struct nfs4_exception exception = {
4699 .interruptible = true,
4700 };
4701 int err;
4702 do {
4703 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4704 trace_nfs4_lookupp(inode, err);
4705 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4706 &exception);
4707 } while (exception.retry);
4708 return err;
4709 }
4710
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4711 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4712 const struct cred *cred)
4713 {
4714 struct nfs_server *server = NFS_SERVER(inode);
4715 struct nfs4_accessargs args = {
4716 .fh = NFS_FH(inode),
4717 .access = entry->mask,
4718 };
4719 struct nfs4_accessres res = {
4720 .server = server,
4721 };
4722 struct rpc_message msg = {
4723 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4724 .rpc_argp = &args,
4725 .rpc_resp = &res,
4726 .rpc_cred = cred,
4727 };
4728 int status = 0;
4729
4730 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4731 res.fattr = nfs_alloc_fattr();
4732 if (res.fattr == NULL)
4733 return -ENOMEM;
4734 args.bitmask = server->cache_consistency_bitmask;
4735 }
4736 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4737 if (!status) {
4738 nfs_access_set_mask(entry, res.access);
4739 if (res.fattr)
4740 nfs_refresh_inode(inode, res.fattr);
4741 }
4742 nfs_free_fattr(res.fattr);
4743 return status;
4744 }
4745
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4746 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4747 const struct cred *cred)
4748 {
4749 struct nfs4_exception exception = {
4750 .interruptible = true,
4751 };
4752 int err;
4753 do {
4754 err = _nfs4_proc_access(inode, entry, cred);
4755 trace_nfs4_access(inode, err);
4756 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4757 &exception);
4758 } while (exception.retry);
4759 return err;
4760 }
4761
4762 /*
4763 * TODO: For the time being, we don't try to get any attributes
4764 * along with any of the zero-copy operations READ, READDIR,
4765 * READLINK, WRITE.
4766 *
4767 * In the case of the first three, we want to put the GETATTR
4768 * after the read-type operation -- this is because it is hard
4769 * to predict the length of a GETATTR response in v4, and thus
4770 * align the READ data correctly. This means that the GETATTR
4771 * may end up partially falling into the page cache, and we should
4772 * shift it into the 'tail' of the xdr_buf before processing.
4773 * To do this efficiently, we need to know the total length
4774 * of data received, which doesn't seem to be available outside
4775 * of the RPC layer.
4776 *
4777 * In the case of WRITE, we also want to put the GETATTR after
4778 * the operation -- in this case because we want to make sure
4779 * we get the post-operation mtime and size.
4780 *
4781 * Both of these changes to the XDR layer would in fact be quite
4782 * minor, but I decided to leave them for a subsequent patch.
4783 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4784 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4785 unsigned int pgbase, unsigned int pglen)
4786 {
4787 struct nfs4_readlink args = {
4788 .fh = NFS_FH(inode),
4789 .pgbase = pgbase,
4790 .pglen = pglen,
4791 .pages = &page,
4792 };
4793 struct nfs4_readlink_res res;
4794 struct rpc_message msg = {
4795 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4796 .rpc_argp = &args,
4797 .rpc_resp = &res,
4798 };
4799
4800 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4801 }
4802
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4803 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4804 unsigned int pgbase, unsigned int pglen)
4805 {
4806 struct nfs4_exception exception = {
4807 .interruptible = true,
4808 };
4809 int err;
4810 do {
4811 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4812 trace_nfs4_readlink(inode, err);
4813 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4814 &exception);
4815 } while (exception.retry);
4816 return err;
4817 }
4818
4819 /*
4820 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4821 */
4822 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4823 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4824 int flags)
4825 {
4826 struct nfs_server *server = NFS_SERVER(dir);
4827 struct nfs4_label l, *ilabel;
4828 struct nfs_open_context *ctx;
4829 struct nfs4_state *state;
4830 int status = 0;
4831
4832 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4833 if (IS_ERR(ctx))
4834 return PTR_ERR(ctx);
4835
4836 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4837
4838 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4839 sattr->ia_mode &= ~current_umask();
4840 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4841 if (IS_ERR(state)) {
4842 status = PTR_ERR(state);
4843 goto out;
4844 }
4845 out:
4846 nfs4_label_release_security(ilabel);
4847 put_nfs_open_context(ctx);
4848 return status;
4849 }
4850
4851 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4852 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4853 {
4854 struct nfs_server *server = NFS_SERVER(dir);
4855 struct nfs_removeargs args = {
4856 .fh = NFS_FH(dir),
4857 .name = *name,
4858 };
4859 struct nfs_removeres res = {
4860 .server = server,
4861 };
4862 struct rpc_message msg = {
4863 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4864 .rpc_argp = &args,
4865 .rpc_resp = &res,
4866 };
4867 unsigned long timestamp = jiffies;
4868 int status;
4869
4870 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4871 if (status == 0) {
4872 spin_lock(&dir->i_lock);
4873 /* Removing a directory decrements nlink in the parent */
4874 if (ftype == NF4DIR && dir->i_nlink > 2)
4875 nfs4_dec_nlink_locked(dir);
4876 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4877 NFS_INO_INVALID_DATA);
4878 spin_unlock(&dir->i_lock);
4879 }
4880 return status;
4881 }
4882
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4883 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4884 {
4885 struct nfs4_exception exception = {
4886 .interruptible = true,
4887 };
4888 struct inode *inode = d_inode(dentry);
4889 int err;
4890
4891 if (inode) {
4892 if (inode->i_nlink == 1)
4893 nfs4_inode_return_delegation(inode);
4894 else
4895 nfs4_inode_make_writeable(inode);
4896 }
4897 do {
4898 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4899 trace_nfs4_remove(dir, &dentry->d_name, err);
4900 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4901 &exception);
4902 } while (exception.retry);
4903 return err;
4904 }
4905
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4906 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4907 {
4908 struct nfs4_exception exception = {
4909 .interruptible = true,
4910 };
4911 int err;
4912
4913 do {
4914 err = _nfs4_proc_remove(dir, name, NF4DIR);
4915 trace_nfs4_remove(dir, name, err);
4916 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4917 &exception);
4918 } while (exception.retry);
4919 return err;
4920 }
4921
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4922 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4923 struct dentry *dentry,
4924 struct inode *inode)
4925 {
4926 struct nfs_removeargs *args = msg->rpc_argp;
4927 struct nfs_removeres *res = msg->rpc_resp;
4928
4929 res->server = NFS_SB(dentry->d_sb);
4930 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4931 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4932
4933 nfs_fattr_init(res->dir_attr);
4934
4935 if (inode) {
4936 nfs4_inode_return_delegation(inode);
4937 nfs_d_prune_case_insensitive_aliases(inode);
4938 }
4939 }
4940
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4941 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4942 {
4943 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4944 &data->args.seq_args,
4945 &data->res.seq_res,
4946 task);
4947 }
4948
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4949 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4950 {
4951 struct nfs_unlinkdata *data = task->tk_calldata;
4952 struct nfs_removeres *res = &data->res;
4953
4954 if (!nfs4_sequence_done(task, &res->seq_res))
4955 return 0;
4956 if (nfs4_async_handle_error(task, res->server, NULL,
4957 &data->timeout) == -EAGAIN)
4958 return 0;
4959 if (task->tk_status == 0)
4960 nfs4_update_changeattr(dir, &res->cinfo,
4961 res->dir_attr->time_start,
4962 NFS_INO_INVALID_DATA);
4963 return 1;
4964 }
4965
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4966 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4967 struct dentry *old_dentry,
4968 struct dentry *new_dentry)
4969 {
4970 struct nfs_renameargs *arg = msg->rpc_argp;
4971 struct nfs_renameres *res = msg->rpc_resp;
4972 struct inode *old_inode = d_inode(old_dentry);
4973 struct inode *new_inode = d_inode(new_dentry);
4974
4975 if (old_inode)
4976 nfs4_inode_make_writeable(old_inode);
4977 if (new_inode)
4978 nfs4_inode_return_delegation(new_inode);
4979 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4980 res->server = NFS_SB(old_dentry->d_sb);
4981 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4982 }
4983
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)4984 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4985 {
4986 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4987 &data->args.seq_args,
4988 &data->res.seq_res,
4989 task);
4990 }
4991
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)4992 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4993 struct inode *new_dir)
4994 {
4995 struct nfs_renamedata *data = task->tk_calldata;
4996 struct nfs_renameres *res = &data->res;
4997
4998 if (!nfs4_sequence_done(task, &res->seq_res))
4999 return 0;
5000 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
5001 return 0;
5002
5003 if (task->tk_status == 0) {
5004 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
5005 if (new_dir != old_dir) {
5006 /* Note: If we moved a directory, nlink will change */
5007 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5008 res->old_fattr->time_start,
5009 NFS_INO_INVALID_NLINK |
5010 NFS_INO_INVALID_DATA);
5011 nfs4_update_changeattr(new_dir, &res->new_cinfo,
5012 res->new_fattr->time_start,
5013 NFS_INO_INVALID_NLINK |
5014 NFS_INO_INVALID_DATA);
5015 } else
5016 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5017 res->old_fattr->time_start,
5018 NFS_INO_INVALID_DATA);
5019 }
5020 return 1;
5021 }
5022
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5023 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5024 {
5025 struct nfs_server *server = NFS_SERVER(inode);
5026 __u32 bitmask[NFS4_BITMASK_SZ];
5027 struct nfs4_link_arg arg = {
5028 .fh = NFS_FH(inode),
5029 .dir_fh = NFS_FH(dir),
5030 .name = name,
5031 .bitmask = bitmask,
5032 };
5033 struct nfs4_link_res res = {
5034 .server = server,
5035 };
5036 struct rpc_message msg = {
5037 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5038 .rpc_argp = &arg,
5039 .rpc_resp = &res,
5040 };
5041 int status = -ENOMEM;
5042
5043 res.fattr = nfs_alloc_fattr_with_label(server);
5044 if (res.fattr == NULL)
5045 goto out;
5046
5047 nfs4_inode_make_writeable(inode);
5048 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5049 inode,
5050 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5051 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5052 if (!status) {
5053 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5054 NFS_INO_INVALID_DATA);
5055 nfs4_inc_nlink(inode);
5056 status = nfs_post_op_update_inode(inode, res.fattr);
5057 if (!status)
5058 nfs_setsecurity(inode, res.fattr);
5059 }
5060
5061 out:
5062 nfs_free_fattr(res.fattr);
5063 return status;
5064 }
5065
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5066 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5067 {
5068 struct nfs4_exception exception = {
5069 .interruptible = true,
5070 };
5071 int err;
5072 do {
5073 err = nfs4_handle_exception(NFS_SERVER(inode),
5074 _nfs4_proc_link(inode, dir, name),
5075 &exception);
5076 } while (exception.retry);
5077 return err;
5078 }
5079
5080 struct nfs4_createdata {
5081 struct rpc_message msg;
5082 struct nfs4_create_arg arg;
5083 struct nfs4_create_res res;
5084 struct nfs_fh fh;
5085 struct nfs_fattr fattr;
5086 };
5087
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)5088 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5089 const struct qstr *name, struct iattr *sattr, u32 ftype)
5090 {
5091 struct nfs4_createdata *data;
5092
5093 data = kzalloc(sizeof(*data), GFP_KERNEL);
5094 if (data != NULL) {
5095 struct nfs_server *server = NFS_SERVER(dir);
5096
5097 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5098 if (IS_ERR(data->fattr.label))
5099 goto out_free;
5100
5101 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5102 data->msg.rpc_argp = &data->arg;
5103 data->msg.rpc_resp = &data->res;
5104 data->arg.dir_fh = NFS_FH(dir);
5105 data->arg.server = server;
5106 data->arg.name = name;
5107 data->arg.attrs = sattr;
5108 data->arg.ftype = ftype;
5109 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5110 data->arg.umask = current_umask();
5111 data->res.server = server;
5112 data->res.fh = &data->fh;
5113 data->res.fattr = &data->fattr;
5114 nfs_fattr_init(data->res.fattr);
5115 }
5116 return data;
5117 out_free:
5118 kfree(data);
5119 return NULL;
5120 }
5121
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5122 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5123 {
5124 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5125 &data->arg.seq_args, &data->res.seq_res, 1);
5126 if (status == 0) {
5127 spin_lock(&dir->i_lock);
5128 /* Creating a directory bumps nlink in the parent */
5129 if (data->arg.ftype == NF4DIR)
5130 nfs4_inc_nlink_locked(dir);
5131 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5132 data->res.fattr->time_start,
5133 NFS_INO_INVALID_DATA);
5134 spin_unlock(&dir->i_lock);
5135 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5136 }
5137 return status;
5138 }
5139
nfs4_free_createdata(struct nfs4_createdata * data)5140 static void nfs4_free_createdata(struct nfs4_createdata *data)
5141 {
5142 nfs4_label_free(data->fattr.label);
5143 kfree(data);
5144 }
5145
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5146 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5147 struct folio *folio, unsigned int len, struct iattr *sattr,
5148 struct nfs4_label *label)
5149 {
5150 struct page *page = &folio->page;
5151 struct nfs4_createdata *data;
5152 int status = -ENAMETOOLONG;
5153
5154 if (len > NFS4_MAXPATHLEN)
5155 goto out;
5156
5157 status = -ENOMEM;
5158 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5159 if (data == NULL)
5160 goto out;
5161
5162 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5163 data->arg.u.symlink.pages = &page;
5164 data->arg.u.symlink.len = len;
5165 data->arg.label = label;
5166
5167 status = nfs4_do_create(dir, dentry, data);
5168
5169 nfs4_free_createdata(data);
5170 out:
5171 return status;
5172 }
5173
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)5174 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5175 struct folio *folio, unsigned int len, struct iattr *sattr)
5176 {
5177 struct nfs4_exception exception = {
5178 .interruptible = true,
5179 };
5180 struct nfs4_label l, *label;
5181 int err;
5182
5183 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5184
5185 do {
5186 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5187 trace_nfs4_symlink(dir, &dentry->d_name, err);
5188 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5189 &exception);
5190 } while (exception.retry);
5191
5192 nfs4_label_release_security(label);
5193 return err;
5194 }
5195
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)5196 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5197 struct iattr *sattr, struct nfs4_label *label)
5198 {
5199 struct nfs4_createdata *data;
5200 int status = -ENOMEM;
5201
5202 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5203 if (data == NULL)
5204 goto out;
5205
5206 data->arg.label = label;
5207 status = nfs4_do_create(dir, dentry, data);
5208
5209 nfs4_free_createdata(data);
5210 out:
5211 return status;
5212 }
5213
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5214 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5215 struct iattr *sattr)
5216 {
5217 struct nfs_server *server = NFS_SERVER(dir);
5218 struct nfs4_exception exception = {
5219 .interruptible = true,
5220 };
5221 struct nfs4_label l, *label;
5222 int err;
5223
5224 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5225
5226 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5227 sattr->ia_mode &= ~current_umask();
5228 do {
5229 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5230 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5231 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5232 &exception);
5233 } while (exception.retry);
5234 nfs4_label_release_security(label);
5235
5236 return err;
5237 }
5238
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5239 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5240 struct nfs_readdir_res *nr_res)
5241 {
5242 struct inode *dir = d_inode(nr_arg->dentry);
5243 struct nfs_server *server = NFS_SERVER(dir);
5244 struct nfs4_readdir_arg args = {
5245 .fh = NFS_FH(dir),
5246 .pages = nr_arg->pages,
5247 .pgbase = 0,
5248 .count = nr_arg->page_len,
5249 .plus = nr_arg->plus,
5250 };
5251 struct nfs4_readdir_res res;
5252 struct rpc_message msg = {
5253 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5254 .rpc_argp = &args,
5255 .rpc_resp = &res,
5256 .rpc_cred = nr_arg->cred,
5257 };
5258 int status;
5259
5260 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5261 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5262 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5263 args.bitmask = server->attr_bitmask_nl;
5264 else
5265 args.bitmask = server->attr_bitmask;
5266
5267 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5268 res.pgbase = args.pgbase;
5269 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5270 &res.seq_res, 0);
5271 if (status >= 0) {
5272 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5273 status += args.pgbase;
5274 }
5275
5276 nfs_invalidate_atime(dir);
5277
5278 dprintk("%s: returns %d\n", __func__, status);
5279 return status;
5280 }
5281
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5282 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5283 struct nfs_readdir_res *res)
5284 {
5285 struct nfs4_exception exception = {
5286 .interruptible = true,
5287 };
5288 int err;
5289 do {
5290 err = _nfs4_proc_readdir(arg, res);
5291 trace_nfs4_readdir(d_inode(arg->dentry), err);
5292 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5293 err, &exception);
5294 } while (exception.retry);
5295 return err;
5296 }
5297
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5298 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5299 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5300 {
5301 struct nfs4_createdata *data;
5302 int mode = sattr->ia_mode;
5303 int status = -ENOMEM;
5304
5305 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5306 if (data == NULL)
5307 goto out;
5308
5309 if (S_ISFIFO(mode))
5310 data->arg.ftype = NF4FIFO;
5311 else if (S_ISBLK(mode)) {
5312 data->arg.ftype = NF4BLK;
5313 data->arg.u.device.specdata1 = MAJOR(rdev);
5314 data->arg.u.device.specdata2 = MINOR(rdev);
5315 }
5316 else if (S_ISCHR(mode)) {
5317 data->arg.ftype = NF4CHR;
5318 data->arg.u.device.specdata1 = MAJOR(rdev);
5319 data->arg.u.device.specdata2 = MINOR(rdev);
5320 } else if (!S_ISSOCK(mode)) {
5321 status = -EINVAL;
5322 goto out_free;
5323 }
5324
5325 data->arg.label = label;
5326 status = nfs4_do_create(dir, dentry, data);
5327 out_free:
5328 nfs4_free_createdata(data);
5329 out:
5330 return status;
5331 }
5332
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5333 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5334 struct iattr *sattr, dev_t rdev)
5335 {
5336 struct nfs_server *server = NFS_SERVER(dir);
5337 struct nfs4_exception exception = {
5338 .interruptible = true,
5339 };
5340 struct nfs4_label l, *label;
5341 int err;
5342
5343 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5344
5345 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5346 sattr->ia_mode &= ~current_umask();
5347 do {
5348 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5349 trace_nfs4_mknod(dir, &dentry->d_name, err);
5350 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5351 &exception);
5352 } while (exception.retry);
5353
5354 nfs4_label_release_security(label);
5355
5356 return err;
5357 }
5358
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5359 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5360 struct nfs_fsstat *fsstat)
5361 {
5362 struct nfs4_statfs_arg args = {
5363 .fh = fhandle,
5364 .bitmask = server->attr_bitmask,
5365 };
5366 struct nfs4_statfs_res res = {
5367 .fsstat = fsstat,
5368 };
5369 struct rpc_message msg = {
5370 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5371 .rpc_argp = &args,
5372 .rpc_resp = &res,
5373 };
5374
5375 nfs_fattr_init(fsstat->fattr);
5376 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5377 }
5378
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5379 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5380 {
5381 struct nfs4_exception exception = {
5382 .interruptible = true,
5383 };
5384 int err;
5385 do {
5386 err = nfs4_handle_exception(server,
5387 _nfs4_proc_statfs(server, fhandle, fsstat),
5388 &exception);
5389 } while (exception.retry);
5390 return err;
5391 }
5392
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5393 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5394 struct nfs_fsinfo *fsinfo)
5395 {
5396 struct nfs4_fsinfo_arg args = {
5397 .fh = fhandle,
5398 .bitmask = server->attr_bitmask,
5399 };
5400 struct nfs4_fsinfo_res res = {
5401 .fsinfo = fsinfo,
5402 };
5403 struct rpc_message msg = {
5404 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5405 .rpc_argp = &args,
5406 .rpc_resp = &res,
5407 };
5408
5409 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5410 }
5411
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5412 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5413 {
5414 struct nfs4_exception exception = {
5415 .interruptible = true,
5416 };
5417 int err;
5418
5419 do {
5420 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5421 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5422 if (err == 0) {
5423 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5424 break;
5425 }
5426 err = nfs4_handle_exception(server, err, &exception);
5427 } while (exception.retry);
5428 return err;
5429 }
5430
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5431 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5432 {
5433 int error;
5434
5435 nfs_fattr_init(fsinfo->fattr);
5436 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5437 if (error == 0) {
5438 /* block layout checks this! */
5439 server->pnfs_blksize = fsinfo->blksize;
5440 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5441 }
5442
5443 return error;
5444 }
5445
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5446 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5447 struct nfs_pathconf *pathconf)
5448 {
5449 struct nfs4_pathconf_arg args = {
5450 .fh = fhandle,
5451 .bitmask = server->attr_bitmask,
5452 };
5453 struct nfs4_pathconf_res res = {
5454 .pathconf = pathconf,
5455 };
5456 struct rpc_message msg = {
5457 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5458 .rpc_argp = &args,
5459 .rpc_resp = &res,
5460 };
5461
5462 /* None of the pathconf attributes are mandatory to implement */
5463 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5464 memset(pathconf, 0, sizeof(*pathconf));
5465 return 0;
5466 }
5467
5468 nfs_fattr_init(pathconf->fattr);
5469 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5470 }
5471
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5472 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5473 struct nfs_pathconf *pathconf)
5474 {
5475 struct nfs4_exception exception = {
5476 .interruptible = true,
5477 };
5478 int err;
5479
5480 do {
5481 err = nfs4_handle_exception(server,
5482 _nfs4_proc_pathconf(server, fhandle, pathconf),
5483 &exception);
5484 } while (exception.retry);
5485 return err;
5486 }
5487
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5488 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5489 const struct nfs_open_context *ctx,
5490 const struct nfs_lock_context *l_ctx,
5491 fmode_t fmode)
5492 {
5493 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5494 }
5495 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5496
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5497 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5498 const struct nfs_open_context *ctx,
5499 const struct nfs_lock_context *l_ctx,
5500 fmode_t fmode)
5501 {
5502 nfs4_stateid _current_stateid;
5503
5504 /* If the current stateid represents a lost lock, then exit */
5505 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5506 return true;
5507 return nfs4_stateid_match(stateid, &_current_stateid);
5508 }
5509
nfs4_error_stateid_expired(int err)5510 static bool nfs4_error_stateid_expired(int err)
5511 {
5512 switch (err) {
5513 case -NFS4ERR_DELEG_REVOKED:
5514 case -NFS4ERR_ADMIN_REVOKED:
5515 case -NFS4ERR_BAD_STATEID:
5516 case -NFS4ERR_STALE_STATEID:
5517 case -NFS4ERR_OLD_STATEID:
5518 case -NFS4ERR_OPENMODE:
5519 case -NFS4ERR_EXPIRED:
5520 return true;
5521 }
5522 return false;
5523 }
5524
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5525 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5526 {
5527 struct nfs_server *server = NFS_SERVER(hdr->inode);
5528
5529 trace_nfs4_read(hdr, task->tk_status);
5530 if (task->tk_status < 0) {
5531 struct nfs4_exception exception = {
5532 .inode = hdr->inode,
5533 .state = hdr->args.context->state,
5534 .stateid = &hdr->args.stateid,
5535 };
5536 task->tk_status = nfs4_async_handle_exception(task,
5537 server, task->tk_status, &exception);
5538 if (exception.retry) {
5539 rpc_restart_call_prepare(task);
5540 return -EAGAIN;
5541 }
5542 }
5543
5544 if (task->tk_status > 0)
5545 renew_lease(server, hdr->timestamp);
5546 return 0;
5547 }
5548
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5549 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5550 struct nfs_pgio_args *args)
5551 {
5552
5553 if (!nfs4_error_stateid_expired(task->tk_status) ||
5554 nfs4_stateid_is_current(&args->stateid,
5555 args->context,
5556 args->lock_context,
5557 FMODE_READ))
5558 return false;
5559 rpc_restart_call_prepare(task);
5560 return true;
5561 }
5562
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5563 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5564 struct nfs_pgio_header *hdr)
5565 {
5566 struct nfs_server *server = NFS_SERVER(hdr->inode);
5567 struct rpc_message *msg = &task->tk_msg;
5568
5569 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5570 task->tk_status == -ENOTSUPP) {
5571 server->caps &= ~NFS_CAP_READ_PLUS;
5572 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5573 rpc_restart_call_prepare(task);
5574 return true;
5575 }
5576 return false;
5577 }
5578
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5579 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5580 {
5581 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5582 return -EAGAIN;
5583 if (nfs4_read_stateid_changed(task, &hdr->args))
5584 return -EAGAIN;
5585 if (nfs4_read_plus_not_supported(task, hdr))
5586 return -EAGAIN;
5587 if (task->tk_status > 0)
5588 nfs_invalidate_atime(hdr->inode);
5589 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5590 nfs4_read_done_cb(task, hdr);
5591 }
5592
5593 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5594 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5595 struct rpc_message *msg)
5596 {
5597 /* Note: We don't use READ_PLUS with pNFS yet */
5598 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5599 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5600 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5601 }
5602 return false;
5603 }
5604 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5605 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5606 struct rpc_message *msg)
5607 {
5608 return false;
5609 }
5610 #endif /* CONFIG_NFS_V4_2 */
5611
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5612 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5613 struct rpc_message *msg)
5614 {
5615 hdr->timestamp = jiffies;
5616 if (!hdr->pgio_done_cb)
5617 hdr->pgio_done_cb = nfs4_read_done_cb;
5618 if (!nfs42_read_plus_support(hdr, msg))
5619 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5620 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5621 }
5622
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5623 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5624 struct nfs_pgio_header *hdr)
5625 {
5626 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5627 &hdr->args.seq_args,
5628 &hdr->res.seq_res,
5629 task))
5630 return 0;
5631 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5632 hdr->args.lock_context,
5633 hdr->rw_mode) == -EIO)
5634 return -EIO;
5635 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5636 return -EIO;
5637 return 0;
5638 }
5639
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5640 static int nfs4_write_done_cb(struct rpc_task *task,
5641 struct nfs_pgio_header *hdr)
5642 {
5643 struct inode *inode = hdr->inode;
5644
5645 trace_nfs4_write(hdr, task->tk_status);
5646 if (task->tk_status < 0) {
5647 struct nfs4_exception exception = {
5648 .inode = hdr->inode,
5649 .state = hdr->args.context->state,
5650 .stateid = &hdr->args.stateid,
5651 };
5652 task->tk_status = nfs4_async_handle_exception(task,
5653 NFS_SERVER(inode), task->tk_status,
5654 &exception);
5655 if (exception.retry) {
5656 rpc_restart_call_prepare(task);
5657 return -EAGAIN;
5658 }
5659 }
5660 if (task->tk_status >= 0) {
5661 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5662 nfs_writeback_update_inode(hdr);
5663 }
5664 return 0;
5665 }
5666
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5667 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5668 struct nfs_pgio_args *args)
5669 {
5670
5671 if (!nfs4_error_stateid_expired(task->tk_status) ||
5672 nfs4_stateid_is_current(&args->stateid,
5673 args->context,
5674 args->lock_context,
5675 FMODE_WRITE))
5676 return false;
5677 rpc_restart_call_prepare(task);
5678 return true;
5679 }
5680
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5681 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5682 {
5683 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5684 return -EAGAIN;
5685 if (nfs4_write_stateid_changed(task, &hdr->args))
5686 return -EAGAIN;
5687 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5688 nfs4_write_done_cb(task, hdr);
5689 }
5690
5691 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5692 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5693 {
5694 /* Don't request attributes for pNFS or O_DIRECT writes */
5695 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5696 return false;
5697 /* Otherwise, request attributes if and only if we don't hold
5698 * a delegation
5699 */
5700 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5701 }
5702
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5703 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5704 struct inode *inode, unsigned long cache_validity)
5705 {
5706 struct nfs_server *server = NFS_SERVER(inode);
5707 unsigned int i;
5708
5709 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5710 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5711
5712 if (cache_validity & NFS_INO_INVALID_CHANGE)
5713 bitmask[0] |= FATTR4_WORD0_CHANGE;
5714 if (cache_validity & NFS_INO_INVALID_ATIME)
5715 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5716 if (cache_validity & NFS_INO_INVALID_MODE)
5717 bitmask[1] |= FATTR4_WORD1_MODE;
5718 if (cache_validity & NFS_INO_INVALID_OTHER)
5719 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5720 if (cache_validity & NFS_INO_INVALID_NLINK)
5721 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5722 if (cache_validity & NFS_INO_INVALID_CTIME)
5723 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5724 if (cache_validity & NFS_INO_INVALID_MTIME)
5725 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5726 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5727 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5728
5729 if (cache_validity & NFS_INO_INVALID_SIZE)
5730 bitmask[0] |= FATTR4_WORD0_SIZE;
5731
5732 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5733 bitmask[i] &= server->attr_bitmask[i];
5734 }
5735
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5736 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5737 struct rpc_message *msg,
5738 struct rpc_clnt **clnt)
5739 {
5740 struct nfs_server *server = NFS_SERVER(hdr->inode);
5741
5742 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5743 hdr->args.bitmask = NULL;
5744 hdr->res.fattr = NULL;
5745 } else {
5746 nfs4_bitmask_set(hdr->args.bitmask_store,
5747 server->cache_consistency_bitmask,
5748 hdr->inode, NFS_INO_INVALID_BLOCKS);
5749 hdr->args.bitmask = hdr->args.bitmask_store;
5750 }
5751
5752 if (!hdr->pgio_done_cb)
5753 hdr->pgio_done_cb = nfs4_write_done_cb;
5754 hdr->res.server = server;
5755 hdr->timestamp = jiffies;
5756
5757 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5758 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5759 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5760 }
5761
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5762 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5763 {
5764 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5765 &data->args.seq_args,
5766 &data->res.seq_res,
5767 task);
5768 }
5769
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5770 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5771 {
5772 struct inode *inode = data->inode;
5773
5774 trace_nfs4_commit(data, task->tk_status);
5775 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5776 NULL, NULL) == -EAGAIN) {
5777 rpc_restart_call_prepare(task);
5778 return -EAGAIN;
5779 }
5780 return 0;
5781 }
5782
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5783 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5784 {
5785 if (!nfs4_sequence_done(task, &data->res.seq_res))
5786 return -EAGAIN;
5787 return data->commit_done_cb(task, data);
5788 }
5789
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5790 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5791 struct rpc_clnt **clnt)
5792 {
5793 struct nfs_server *server = NFS_SERVER(data->inode);
5794
5795 if (data->commit_done_cb == NULL)
5796 data->commit_done_cb = nfs4_commit_done_cb;
5797 data->res.server = server;
5798 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5799 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5800 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5801 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5802 }
5803
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5804 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5805 struct nfs_commitres *res)
5806 {
5807 struct inode *dst_inode = file_inode(dst);
5808 struct nfs_server *server = NFS_SERVER(dst_inode);
5809 struct rpc_message msg = {
5810 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5811 .rpc_argp = args,
5812 .rpc_resp = res,
5813 };
5814
5815 args->fh = NFS_FH(dst_inode);
5816 return nfs4_call_sync(server->client, server, &msg,
5817 &args->seq_args, &res->seq_res, 1);
5818 }
5819
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5820 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5821 {
5822 struct nfs_commitargs args = {
5823 .offset = offset,
5824 .count = count,
5825 };
5826 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5827 struct nfs4_exception exception = { };
5828 int status;
5829
5830 do {
5831 status = _nfs4_proc_commit(dst, &args, res);
5832 status = nfs4_handle_exception(dst_server, status, &exception);
5833 } while (exception.retry);
5834
5835 return status;
5836 }
5837
5838 struct nfs4_renewdata {
5839 struct nfs_client *client;
5840 unsigned long timestamp;
5841 };
5842
5843 /*
5844 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5845 * standalone procedure for queueing an asynchronous RENEW.
5846 */
nfs4_renew_release(void * calldata)5847 static void nfs4_renew_release(void *calldata)
5848 {
5849 struct nfs4_renewdata *data = calldata;
5850 struct nfs_client *clp = data->client;
5851
5852 if (refcount_read(&clp->cl_count) > 1)
5853 nfs4_schedule_state_renewal(clp);
5854 nfs_put_client(clp);
5855 kfree(data);
5856 }
5857
nfs4_renew_done(struct rpc_task * task,void * calldata)5858 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5859 {
5860 struct nfs4_renewdata *data = calldata;
5861 struct nfs_client *clp = data->client;
5862 unsigned long timestamp = data->timestamp;
5863
5864 trace_nfs4_renew_async(clp, task->tk_status);
5865 switch (task->tk_status) {
5866 case 0:
5867 break;
5868 case -NFS4ERR_LEASE_MOVED:
5869 nfs4_schedule_lease_moved_recovery(clp);
5870 break;
5871 default:
5872 /* Unless we're shutting down, schedule state recovery! */
5873 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5874 return;
5875 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5876 nfs4_schedule_lease_recovery(clp);
5877 return;
5878 }
5879 nfs4_schedule_path_down_recovery(clp);
5880 }
5881 do_renew_lease(clp, timestamp);
5882 }
5883
5884 static const struct rpc_call_ops nfs4_renew_ops = {
5885 .rpc_call_done = nfs4_renew_done,
5886 .rpc_release = nfs4_renew_release,
5887 };
5888
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5889 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5890 {
5891 struct rpc_message msg = {
5892 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5893 .rpc_argp = clp,
5894 .rpc_cred = cred,
5895 };
5896 struct nfs4_renewdata *data;
5897
5898 if (renew_flags == 0)
5899 return 0;
5900 if (!refcount_inc_not_zero(&clp->cl_count))
5901 return -EIO;
5902 data = kmalloc(sizeof(*data), GFP_NOFS);
5903 if (data == NULL) {
5904 nfs_put_client(clp);
5905 return -ENOMEM;
5906 }
5907 data->client = clp;
5908 data->timestamp = jiffies;
5909 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5910 &nfs4_renew_ops, data);
5911 }
5912
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5913 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5914 {
5915 struct rpc_message msg = {
5916 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5917 .rpc_argp = clp,
5918 .rpc_cred = cred,
5919 };
5920 unsigned long now = jiffies;
5921 int status;
5922
5923 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5924 if (status < 0)
5925 return status;
5926 do_renew_lease(clp, now);
5927 return 0;
5928 }
5929
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5930 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5931 enum nfs4_acl_type type)
5932 {
5933 switch (type) {
5934 default:
5935 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5936 case NFS4ACL_DACL:
5937 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5938 case NFS4ACL_SACL:
5939 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5940 }
5941 }
5942
5943 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5944 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5945 * the stack.
5946 */
5947 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5948
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5949 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5950 struct page **pages)
5951 {
5952 struct page *newpage, **spages;
5953 int rc = 0;
5954 size_t len;
5955 spages = pages;
5956
5957 do {
5958 len = min_t(size_t, PAGE_SIZE, buflen);
5959 newpage = alloc_page(GFP_KERNEL);
5960
5961 if (newpage == NULL)
5962 goto unwind;
5963 memcpy(page_address(newpage), buf, len);
5964 buf += len;
5965 buflen -= len;
5966 *pages++ = newpage;
5967 rc++;
5968 } while (buflen != 0);
5969
5970 return rc;
5971
5972 unwind:
5973 for(; rc > 0; rc--)
5974 __free_page(spages[rc-1]);
5975 return -ENOMEM;
5976 }
5977
5978 struct nfs4_cached_acl {
5979 enum nfs4_acl_type type;
5980 int cached;
5981 size_t len;
5982 char data[];
5983 };
5984
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5985 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5986 {
5987 struct nfs_inode *nfsi = NFS_I(inode);
5988
5989 spin_lock(&inode->i_lock);
5990 kfree(nfsi->nfs4_acl);
5991 nfsi->nfs4_acl = acl;
5992 spin_unlock(&inode->i_lock);
5993 }
5994
nfs4_zap_acl_attr(struct inode * inode)5995 static void nfs4_zap_acl_attr(struct inode *inode)
5996 {
5997 nfs4_set_cached_acl(inode, NULL);
5998 }
5999
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)6000 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
6001 size_t buflen, enum nfs4_acl_type type)
6002 {
6003 struct nfs_inode *nfsi = NFS_I(inode);
6004 struct nfs4_cached_acl *acl;
6005 int ret = -ENOENT;
6006
6007 spin_lock(&inode->i_lock);
6008 acl = nfsi->nfs4_acl;
6009 if (acl == NULL)
6010 goto out;
6011 if (acl->type != type)
6012 goto out;
6013 if (buf == NULL) /* user is just asking for length */
6014 goto out_len;
6015 if (acl->cached == 0)
6016 goto out;
6017 ret = -ERANGE; /* see getxattr(2) man page */
6018 if (acl->len > buflen)
6019 goto out;
6020 memcpy(buf, acl->data, acl->len);
6021 out_len:
6022 ret = acl->len;
6023 out:
6024 spin_unlock(&inode->i_lock);
6025 return ret;
6026 }
6027
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)6028 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6029 size_t pgbase, size_t acl_len,
6030 enum nfs4_acl_type type)
6031 {
6032 struct nfs4_cached_acl *acl;
6033 size_t buflen = sizeof(*acl) + acl_len;
6034
6035 if (buflen <= PAGE_SIZE) {
6036 acl = kmalloc(buflen, GFP_KERNEL);
6037 if (acl == NULL)
6038 goto out;
6039 acl->cached = 1;
6040 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6041 } else {
6042 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
6043 if (acl == NULL)
6044 goto out;
6045 acl->cached = 0;
6046 }
6047 acl->type = type;
6048 acl->len = acl_len;
6049 out:
6050 nfs4_set_cached_acl(inode, acl);
6051 }
6052
6053 /*
6054 * The getxattr API returns the required buffer length when called with a
6055 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6056 * the required buf. On a NULL buf, we send a page of data to the server
6057 * guessing that the ACL request can be serviced by a page. If so, we cache
6058 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6059 * the cache. If not so, we throw away the page, and cache the required
6060 * length. The next getxattr call will then produce another round trip to
6061 * the server, this time with the input buf of the required size.
6062 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6063 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6064 size_t buflen, enum nfs4_acl_type type)
6065 {
6066 struct page **pages;
6067 struct nfs_getaclargs args = {
6068 .fh = NFS_FH(inode),
6069 .acl_type = type,
6070 .acl_len = buflen,
6071 };
6072 struct nfs_getaclres res = {
6073 .acl_type = type,
6074 .acl_len = buflen,
6075 };
6076 struct rpc_message msg = {
6077 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6078 .rpc_argp = &args,
6079 .rpc_resp = &res,
6080 };
6081 unsigned int npages;
6082 int ret = -ENOMEM, i;
6083 struct nfs_server *server = NFS_SERVER(inode);
6084
6085 if (buflen == 0)
6086 buflen = server->rsize;
6087
6088 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6089 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
6090 if (!pages)
6091 return -ENOMEM;
6092
6093 args.acl_pages = pages;
6094
6095 for (i = 0; i < npages; i++) {
6096 pages[i] = alloc_page(GFP_KERNEL);
6097 if (!pages[i])
6098 goto out_free;
6099 }
6100
6101 /* for decoding across pages */
6102 res.acl_scratch = alloc_page(GFP_KERNEL);
6103 if (!res.acl_scratch)
6104 goto out_free;
6105
6106 args.acl_len = npages * PAGE_SIZE;
6107
6108 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
6109 __func__, buf, buflen, npages, args.acl_len);
6110 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6111 &msg, &args.seq_args, &res.seq_res, 0);
6112 if (ret)
6113 goto out_free;
6114
6115 /* Handle the case where the passed-in buffer is too short */
6116 if (res.acl_flags & NFS4_ACL_TRUNC) {
6117 /* Did the user only issue a request for the acl length? */
6118 if (buf == NULL)
6119 goto out_ok;
6120 ret = -ERANGE;
6121 goto out_free;
6122 }
6123 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6124 type);
6125 if (buf) {
6126 if (res.acl_len > buflen) {
6127 ret = -ERANGE;
6128 goto out_free;
6129 }
6130 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6131 }
6132 out_ok:
6133 ret = res.acl_len;
6134 out_free:
6135 while (--i >= 0)
6136 __free_page(pages[i]);
6137 if (res.acl_scratch)
6138 __free_page(res.acl_scratch);
6139 kfree(pages);
6140 return ret;
6141 }
6142
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6143 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6144 size_t buflen, enum nfs4_acl_type type)
6145 {
6146 struct nfs4_exception exception = {
6147 .interruptible = true,
6148 };
6149 ssize_t ret;
6150 do {
6151 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6152 trace_nfs4_get_acl(inode, ret);
6153 if (ret >= 0)
6154 break;
6155 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6156 } while (exception.retry);
6157 return ret;
6158 }
6159
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6160 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6161 enum nfs4_acl_type type)
6162 {
6163 struct nfs_server *server = NFS_SERVER(inode);
6164 int ret;
6165
6166 if (!nfs4_server_supports_acls(server, type))
6167 return -EOPNOTSUPP;
6168 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6169 if (ret < 0)
6170 return ret;
6171 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6172 nfs_zap_acl_cache(inode);
6173 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6174 if (ret != -ENOENT)
6175 /* -ENOENT is returned if there is no ACL or if there is an ACL
6176 * but no cached acl data, just the acl length */
6177 return ret;
6178 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6179 }
6180
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6181 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6182 size_t buflen, enum nfs4_acl_type type)
6183 {
6184 struct nfs_server *server = NFS_SERVER(inode);
6185 struct page *pages[NFS4ACL_MAXPAGES];
6186 struct nfs_setaclargs arg = {
6187 .fh = NFS_FH(inode),
6188 .acl_type = type,
6189 .acl_len = buflen,
6190 .acl_pages = pages,
6191 };
6192 struct nfs_setaclres res;
6193 struct rpc_message msg = {
6194 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6195 .rpc_argp = &arg,
6196 .rpc_resp = &res,
6197 };
6198 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6199 int ret, i;
6200
6201 /* You can't remove system.nfs4_acl: */
6202 if (buflen == 0)
6203 return -EINVAL;
6204 if (!nfs4_server_supports_acls(server, type))
6205 return -EOPNOTSUPP;
6206 if (npages > ARRAY_SIZE(pages))
6207 return -ERANGE;
6208 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6209 if (i < 0)
6210 return i;
6211 nfs4_inode_make_writeable(inode);
6212 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6213
6214 /*
6215 * Free each page after tx, so the only ref left is
6216 * held by the network stack
6217 */
6218 for (; i > 0; i--)
6219 put_page(pages[i-1]);
6220
6221 /*
6222 * Acl update can result in inode attribute update.
6223 * so mark the attribute cache invalid.
6224 */
6225 spin_lock(&inode->i_lock);
6226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6227 NFS_INO_INVALID_CTIME |
6228 NFS_INO_REVAL_FORCED);
6229 spin_unlock(&inode->i_lock);
6230 nfs_access_zap_cache(inode);
6231 nfs_zap_acl_cache(inode);
6232 return ret;
6233 }
6234
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6235 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6236 size_t buflen, enum nfs4_acl_type type)
6237 {
6238 struct nfs4_exception exception = { };
6239 int err;
6240 do {
6241 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6242 trace_nfs4_set_acl(inode, err);
6243 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6244 /*
6245 * no need to retry since the kernel
6246 * isn't involved in encoding the ACEs.
6247 */
6248 err = -EINVAL;
6249 break;
6250 }
6251 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6252 &exception);
6253 } while (exception.retry);
6254 return err;
6255 }
6256
6257 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6258 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6259 size_t buflen)
6260 {
6261 struct nfs_server *server = NFS_SERVER(inode);
6262 struct nfs4_label label = {0, 0, buflen, buf};
6263
6264 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6265 struct nfs_fattr fattr = {
6266 .label = &label,
6267 };
6268 struct nfs4_getattr_arg arg = {
6269 .fh = NFS_FH(inode),
6270 .bitmask = bitmask,
6271 };
6272 struct nfs4_getattr_res res = {
6273 .fattr = &fattr,
6274 .server = server,
6275 };
6276 struct rpc_message msg = {
6277 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6278 .rpc_argp = &arg,
6279 .rpc_resp = &res,
6280 };
6281 int ret;
6282
6283 nfs_fattr_init(&fattr);
6284
6285 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6286 if (ret)
6287 return ret;
6288 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6289 return -ENOENT;
6290 return label.len;
6291 }
6292
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6293 static int nfs4_get_security_label(struct inode *inode, void *buf,
6294 size_t buflen)
6295 {
6296 struct nfs4_exception exception = {
6297 .interruptible = true,
6298 };
6299 int err;
6300
6301 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6302 return -EOPNOTSUPP;
6303
6304 do {
6305 err = _nfs4_get_security_label(inode, buf, buflen);
6306 trace_nfs4_get_security_label(inode, err);
6307 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6308 &exception);
6309 } while (exception.retry);
6310 return err;
6311 }
6312
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6313 static int _nfs4_do_set_security_label(struct inode *inode,
6314 struct nfs4_label *ilabel,
6315 struct nfs_fattr *fattr)
6316 {
6317
6318 struct iattr sattr = {0};
6319 struct nfs_server *server = NFS_SERVER(inode);
6320 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6321 struct nfs_setattrargs arg = {
6322 .fh = NFS_FH(inode),
6323 .iap = &sattr,
6324 .server = server,
6325 .bitmask = bitmask,
6326 .label = ilabel,
6327 };
6328 struct nfs_setattrres res = {
6329 .fattr = fattr,
6330 .server = server,
6331 };
6332 struct rpc_message msg = {
6333 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6334 .rpc_argp = &arg,
6335 .rpc_resp = &res,
6336 };
6337 int status;
6338
6339 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6340
6341 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6342 if (status)
6343 dprintk("%s failed: %d\n", __func__, status);
6344
6345 return status;
6346 }
6347
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6348 static int nfs4_do_set_security_label(struct inode *inode,
6349 struct nfs4_label *ilabel,
6350 struct nfs_fattr *fattr)
6351 {
6352 struct nfs4_exception exception = { };
6353 int err;
6354
6355 do {
6356 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6357 trace_nfs4_set_security_label(inode, err);
6358 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6359 &exception);
6360 } while (exception.retry);
6361 return err;
6362 }
6363
6364 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6365 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6366 {
6367 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6368 struct nfs_fattr *fattr;
6369 int status;
6370
6371 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6372 return -EOPNOTSUPP;
6373
6374 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6375 if (fattr == NULL)
6376 return -ENOMEM;
6377
6378 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6379 if (status == 0)
6380 nfs_setsecurity(inode, fattr);
6381
6382 nfs_free_fattr(fattr);
6383 return status;
6384 }
6385 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6386
6387
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6388 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6389 nfs4_verifier *bootverf)
6390 {
6391 __be32 verf[2];
6392
6393 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6394 /* An impossible timestamp guarantees this value
6395 * will never match a generated boot time. */
6396 verf[0] = cpu_to_be32(U32_MAX);
6397 verf[1] = cpu_to_be32(U32_MAX);
6398 } else {
6399 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6400 u64 ns = ktime_to_ns(nn->boot_time);
6401
6402 verf[0] = cpu_to_be32(ns >> 32);
6403 verf[1] = cpu_to_be32(ns);
6404 }
6405 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6406 }
6407
6408 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6409 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6410 {
6411 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6412 struct nfs_netns_client *nn_clp = nn->nfs_client;
6413 const char *id;
6414
6415 buf[0] = '\0';
6416
6417 if (nn_clp) {
6418 rcu_read_lock();
6419 id = rcu_dereference(nn_clp->identifier);
6420 if (id)
6421 strscpy(buf, id, buflen);
6422 rcu_read_unlock();
6423 }
6424
6425 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6426 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6427
6428 return strlen(buf);
6429 }
6430
6431 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6432 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6433 {
6434 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6435 size_t buflen;
6436 size_t len;
6437 char *str;
6438
6439 if (clp->cl_owner_id != NULL)
6440 return 0;
6441
6442 rcu_read_lock();
6443 len = 14 +
6444 strlen(clp->cl_rpcclient->cl_nodename) +
6445 1 +
6446 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6447 1;
6448 rcu_read_unlock();
6449
6450 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6451 if (buflen)
6452 len += buflen + 1;
6453
6454 if (len > NFS4_OPAQUE_LIMIT + 1)
6455 return -EINVAL;
6456
6457 /*
6458 * Since this string is allocated at mount time, and held until the
6459 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6460 * about a memory-reclaim deadlock.
6461 */
6462 str = kmalloc(len, GFP_KERNEL);
6463 if (!str)
6464 return -ENOMEM;
6465
6466 rcu_read_lock();
6467 if (buflen)
6468 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6469 clp->cl_rpcclient->cl_nodename, buf,
6470 rpc_peeraddr2str(clp->cl_rpcclient,
6471 RPC_DISPLAY_ADDR));
6472 else
6473 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6474 clp->cl_rpcclient->cl_nodename,
6475 rpc_peeraddr2str(clp->cl_rpcclient,
6476 RPC_DISPLAY_ADDR));
6477 rcu_read_unlock();
6478
6479 clp->cl_owner_id = str;
6480 return 0;
6481 }
6482
6483 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6484 nfs4_init_uniform_client_string(struct nfs_client *clp)
6485 {
6486 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6487 size_t buflen;
6488 size_t len;
6489 char *str;
6490
6491 if (clp->cl_owner_id != NULL)
6492 return 0;
6493
6494 len = 10 + 10 + 1 + 10 + 1 +
6495 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6496
6497 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6498 if (buflen)
6499 len += buflen + 1;
6500
6501 if (len > NFS4_OPAQUE_LIMIT + 1)
6502 return -EINVAL;
6503
6504 /*
6505 * Since this string is allocated at mount time, and held until the
6506 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6507 * about a memory-reclaim deadlock.
6508 */
6509 str = kmalloc(len, GFP_KERNEL);
6510 if (!str)
6511 return -ENOMEM;
6512
6513 if (buflen)
6514 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6515 clp->rpc_ops->version, clp->cl_minorversion,
6516 buf, clp->cl_rpcclient->cl_nodename);
6517 else
6518 scnprintf(str, len, "Linux NFSv%u.%u %s",
6519 clp->rpc_ops->version, clp->cl_minorversion,
6520 clp->cl_rpcclient->cl_nodename);
6521 clp->cl_owner_id = str;
6522 return 0;
6523 }
6524
6525 /*
6526 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6527 * services. Advertise one based on the address family of the
6528 * clientaddr.
6529 */
6530 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6531 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6532 {
6533 if (strchr(clp->cl_ipaddr, ':') != NULL)
6534 return scnprintf(buf, len, "tcp6");
6535 else
6536 return scnprintf(buf, len, "tcp");
6537 }
6538
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6539 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6540 {
6541 struct nfs4_setclientid *sc = calldata;
6542
6543 if (task->tk_status == 0)
6544 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6545 }
6546
6547 static const struct rpc_call_ops nfs4_setclientid_ops = {
6548 .rpc_call_done = nfs4_setclientid_done,
6549 };
6550
6551 /**
6552 * nfs4_proc_setclientid - Negotiate client ID
6553 * @clp: state data structure
6554 * @program: RPC program for NFSv4 callback service
6555 * @port: IP port number for NFS4 callback service
6556 * @cred: credential to use for this call
6557 * @res: where to place the result
6558 *
6559 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6560 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6561 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6562 unsigned short port, const struct cred *cred,
6563 struct nfs4_setclientid_res *res)
6564 {
6565 nfs4_verifier sc_verifier;
6566 struct nfs4_setclientid setclientid = {
6567 .sc_verifier = &sc_verifier,
6568 .sc_prog = program,
6569 .sc_clnt = clp,
6570 };
6571 struct rpc_message msg = {
6572 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6573 .rpc_argp = &setclientid,
6574 .rpc_resp = res,
6575 .rpc_cred = cred,
6576 };
6577 struct rpc_task_setup task_setup_data = {
6578 .rpc_client = clp->cl_rpcclient,
6579 .rpc_message = &msg,
6580 .callback_ops = &nfs4_setclientid_ops,
6581 .callback_data = &setclientid,
6582 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6583 };
6584 unsigned long now = jiffies;
6585 int status;
6586
6587 /* nfs_client_id4 */
6588 nfs4_init_boot_verifier(clp, &sc_verifier);
6589
6590 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6591 status = nfs4_init_uniform_client_string(clp);
6592 else
6593 status = nfs4_init_nonuniform_client_string(clp);
6594
6595 if (status)
6596 goto out;
6597
6598 /* cb_client4 */
6599 setclientid.sc_netid_len =
6600 nfs4_init_callback_netid(clp,
6601 setclientid.sc_netid,
6602 sizeof(setclientid.sc_netid));
6603 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6604 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6605 clp->cl_ipaddr, port >> 8, port & 255);
6606
6607 dprintk("NFS call setclientid auth=%s, '%s'\n",
6608 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6609 clp->cl_owner_id);
6610
6611 status = nfs4_call_sync_custom(&task_setup_data);
6612 if (setclientid.sc_cred) {
6613 kfree(clp->cl_acceptor);
6614 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6615 put_rpccred(setclientid.sc_cred);
6616 }
6617
6618 if (status == 0)
6619 do_renew_lease(clp, now);
6620 out:
6621 trace_nfs4_setclientid(clp, status);
6622 dprintk("NFS reply setclientid: %d\n", status);
6623 return status;
6624 }
6625
6626 /**
6627 * nfs4_proc_setclientid_confirm - Confirm client ID
6628 * @clp: state data structure
6629 * @arg: result of a previous SETCLIENTID
6630 * @cred: credential to use for this call
6631 *
6632 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6633 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6634 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6635 struct nfs4_setclientid_res *arg,
6636 const struct cred *cred)
6637 {
6638 struct rpc_message msg = {
6639 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6640 .rpc_argp = arg,
6641 .rpc_cred = cred,
6642 };
6643 int status;
6644
6645 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6646 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6647 clp->cl_clientid);
6648 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6649 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6650 trace_nfs4_setclientid_confirm(clp, status);
6651 dprintk("NFS reply setclientid_confirm: %d\n", status);
6652 return status;
6653 }
6654
6655 struct nfs4_delegreturndata {
6656 struct nfs4_delegreturnargs args;
6657 struct nfs4_delegreturnres res;
6658 struct nfs_fh fh;
6659 nfs4_stateid stateid;
6660 unsigned long timestamp;
6661 struct {
6662 struct nfs4_layoutreturn_args arg;
6663 struct nfs4_layoutreturn_res res;
6664 struct nfs4_xdr_opaque_data ld_private;
6665 u32 roc_barrier;
6666 bool roc;
6667 } lr;
6668 struct nfs4_delegattr sattr;
6669 struct nfs_fattr fattr;
6670 int rpc_status;
6671 struct inode *inode;
6672 };
6673
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6674 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6675 {
6676 struct nfs4_delegreturndata *data = calldata;
6677 struct nfs4_exception exception = {
6678 .inode = data->inode,
6679 .stateid = &data->stateid,
6680 .task_is_privileged = data->args.seq_args.sa_privileged,
6681 };
6682
6683 if (!nfs4_sequence_done(task, &data->res.seq_res))
6684 return;
6685
6686 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6687
6688 /* Handle Layoutreturn errors */
6689 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6690 &data->res.lr_ret) == -EAGAIN)
6691 goto out_restart;
6692
6693 if (data->args.sattr_args && task->tk_status != 0) {
6694 switch(data->res.sattr_ret) {
6695 case 0:
6696 data->args.sattr_args = NULL;
6697 data->res.sattr_res = false;
6698 break;
6699 case -NFS4ERR_ADMIN_REVOKED:
6700 case -NFS4ERR_DELEG_REVOKED:
6701 case -NFS4ERR_EXPIRED:
6702 case -NFS4ERR_BAD_STATEID:
6703 /* Let the main handler below do stateid recovery */
6704 break;
6705 case -NFS4ERR_OLD_STATEID:
6706 if (nfs4_refresh_delegation_stateid(&data->stateid,
6707 data->inode))
6708 goto out_restart;
6709 fallthrough;
6710 default:
6711 data->args.sattr_args = NULL;
6712 data->res.sattr_res = false;
6713 goto out_restart;
6714 }
6715 }
6716
6717 switch (task->tk_status) {
6718 case 0:
6719 renew_lease(data->res.server, data->timestamp);
6720 break;
6721 case -NFS4ERR_ADMIN_REVOKED:
6722 case -NFS4ERR_DELEG_REVOKED:
6723 case -NFS4ERR_EXPIRED:
6724 nfs4_free_revoked_stateid(data->res.server,
6725 data->args.stateid,
6726 task->tk_msg.rpc_cred);
6727 fallthrough;
6728 case -NFS4ERR_BAD_STATEID:
6729 case -NFS4ERR_STALE_STATEID:
6730 case -ETIMEDOUT:
6731 task->tk_status = 0;
6732 break;
6733 case -NFS4ERR_OLD_STATEID:
6734 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6735 nfs4_stateid_seqid_inc(&data->stateid);
6736 if (data->args.bitmask) {
6737 data->args.bitmask = NULL;
6738 data->res.fattr = NULL;
6739 }
6740 goto out_restart;
6741 case -NFS4ERR_ACCESS:
6742 if (data->args.bitmask) {
6743 data->args.bitmask = NULL;
6744 data->res.fattr = NULL;
6745 goto out_restart;
6746 }
6747 fallthrough;
6748 default:
6749 task->tk_status = nfs4_async_handle_exception(task,
6750 data->res.server, task->tk_status,
6751 &exception);
6752 if (exception.retry)
6753 goto out_restart;
6754 }
6755 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6756 data->rpc_status = task->tk_status;
6757 return;
6758 out_restart:
6759 task->tk_status = 0;
6760 rpc_restart_call_prepare(task);
6761 }
6762
nfs4_delegreturn_release(void * calldata)6763 static void nfs4_delegreturn_release(void *calldata)
6764 {
6765 struct nfs4_delegreturndata *data = calldata;
6766 struct inode *inode = data->inode;
6767
6768 if (data->lr.roc)
6769 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6770 data->res.lr_ret);
6771 if (inode) {
6772 nfs4_fattr_set_prechange(&data->fattr,
6773 inode_peek_iversion_raw(inode));
6774 nfs_refresh_inode(inode, &data->fattr);
6775 nfs_iput_and_deactive(inode);
6776 }
6777 kfree(calldata);
6778 }
6779
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6780 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6781 {
6782 struct nfs4_delegreturndata *d_data;
6783 struct pnfs_layout_hdr *lo;
6784
6785 d_data = data;
6786
6787 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6788 nfs4_sequence_done(task, &d_data->res.seq_res);
6789 return;
6790 }
6791
6792 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6793 if (lo && !pnfs_layout_is_valid(lo)) {
6794 d_data->args.lr_args = NULL;
6795 d_data->res.lr_res = NULL;
6796 }
6797
6798 nfs4_setup_sequence(d_data->res.server->nfs_client,
6799 &d_data->args.seq_args,
6800 &d_data->res.seq_res,
6801 task);
6802 }
6803
6804 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6805 .rpc_call_prepare = nfs4_delegreturn_prepare,
6806 .rpc_call_done = nfs4_delegreturn_done,
6807 .rpc_release = nfs4_delegreturn_release,
6808 };
6809
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6810 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6811 const nfs4_stateid *stateid,
6812 struct nfs_delegation *delegation,
6813 int issync)
6814 {
6815 struct nfs4_delegreturndata *data;
6816 struct nfs_server *server = NFS_SERVER(inode);
6817 struct rpc_task *task;
6818 struct rpc_message msg = {
6819 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6820 .rpc_cred = cred,
6821 };
6822 struct rpc_task_setup task_setup_data = {
6823 .rpc_client = server->client,
6824 .rpc_message = &msg,
6825 .callback_ops = &nfs4_delegreturn_ops,
6826 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6827 };
6828 int status = 0;
6829
6830 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6831 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6832
6833 data = kzalloc(sizeof(*data), GFP_KERNEL);
6834 if (data == NULL)
6835 return -ENOMEM;
6836
6837 nfs4_state_protect(server->nfs_client,
6838 NFS_SP4_MACH_CRED_CLEANUP,
6839 &task_setup_data.rpc_client, &msg);
6840
6841 data->args.fhandle = &data->fh;
6842 data->args.stateid = &data->stateid;
6843 nfs4_bitmask_set(data->args.bitmask_store,
6844 server->cache_consistency_bitmask, inode, 0);
6845 data->args.bitmask = data->args.bitmask_store;
6846 nfs_copy_fh(&data->fh, NFS_FH(inode));
6847 nfs4_stateid_copy(&data->stateid, stateid);
6848 data->res.fattr = &data->fattr;
6849 data->res.server = server;
6850 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6851 data->lr.arg.ld_private = &data->lr.ld_private;
6852 nfs_fattr_init(data->res.fattr);
6853 data->timestamp = jiffies;
6854 data->rpc_status = 0;
6855 data->inode = nfs_igrab_and_active(inode);
6856 if (data->inode || issync) {
6857 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6858 cred);
6859 if (data->lr.roc) {
6860 data->args.lr_args = &data->lr.arg;
6861 data->res.lr_res = &data->lr.res;
6862 }
6863 }
6864
6865 if (delegation &&
6866 test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) {
6867 if (delegation->type & FMODE_READ) {
6868 data->sattr.atime = inode_get_atime(inode);
6869 data->sattr.atime_set = true;
6870 }
6871 if (delegation->type & FMODE_WRITE) {
6872 data->sattr.mtime = inode_get_mtime(inode);
6873 data->sattr.mtime_set = true;
6874 }
6875 data->args.sattr_args = &data->sattr;
6876 data->res.sattr_res = true;
6877 }
6878
6879 if (!data->inode)
6880 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6881 1);
6882 else
6883 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6884 0);
6885
6886 task_setup_data.callback_data = data;
6887 msg.rpc_argp = &data->args;
6888 msg.rpc_resp = &data->res;
6889 task = rpc_run_task(&task_setup_data);
6890 if (IS_ERR(task))
6891 return PTR_ERR(task);
6892 if (!issync)
6893 goto out;
6894 status = rpc_wait_for_completion_task(task);
6895 if (status != 0)
6896 goto out;
6897 status = data->rpc_status;
6898 out:
6899 rpc_put_task(task);
6900 return status;
6901 }
6902
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6903 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6904 const nfs4_stateid *stateid,
6905 struct nfs_delegation *delegation, int issync)
6906 {
6907 struct nfs_server *server = NFS_SERVER(inode);
6908 struct nfs4_exception exception = { };
6909 int err;
6910 do {
6911 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6912 delegation, issync);
6913 trace_nfs4_delegreturn(inode, stateid, err);
6914 switch (err) {
6915 case -NFS4ERR_STALE_STATEID:
6916 case -NFS4ERR_EXPIRED:
6917 case 0:
6918 return 0;
6919 }
6920 err = nfs4_handle_exception(server, err, &exception);
6921 } while (exception.retry);
6922 return err;
6923 }
6924
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6925 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6926 {
6927 struct inode *inode = state->inode;
6928 struct nfs_server *server = NFS_SERVER(inode);
6929 struct nfs_client *clp = server->nfs_client;
6930 struct nfs_lockt_args arg = {
6931 .fh = NFS_FH(inode),
6932 .fl = request,
6933 };
6934 struct nfs_lockt_res res = {
6935 .denied = request,
6936 };
6937 struct rpc_message msg = {
6938 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6939 .rpc_argp = &arg,
6940 .rpc_resp = &res,
6941 .rpc_cred = state->owner->so_cred,
6942 };
6943 struct nfs4_lock_state *lsp;
6944 int status;
6945
6946 arg.lock_owner.clientid = clp->cl_clientid;
6947 status = nfs4_set_lock_state(state, request);
6948 if (status != 0)
6949 goto out;
6950 lsp = request->fl_u.nfs4_fl.owner;
6951 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6952 arg.lock_owner.s_dev = server->s_dev;
6953 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6954 switch (status) {
6955 case 0:
6956 request->c.flc_type = F_UNLCK;
6957 break;
6958 case -NFS4ERR_DENIED:
6959 status = 0;
6960 }
6961 request->fl_ops->fl_release_private(request);
6962 request->fl_ops = NULL;
6963 out:
6964 return status;
6965 }
6966
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6967 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6968 {
6969 struct nfs4_exception exception = {
6970 .interruptible = true,
6971 };
6972 int err;
6973
6974 do {
6975 err = _nfs4_proc_getlk(state, cmd, request);
6976 trace_nfs4_get_lock(request, state, cmd, err);
6977 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6978 &exception);
6979 } while (exception.retry);
6980 return err;
6981 }
6982
6983 /*
6984 * Update the seqid of a lock stateid after receiving
6985 * NFS4ERR_OLD_STATEID
6986 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6987 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6988 struct nfs4_lock_state *lsp)
6989 {
6990 struct nfs4_state *state = lsp->ls_state;
6991 bool ret = false;
6992
6993 spin_lock(&state->state_lock);
6994 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6995 goto out;
6996 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6997 nfs4_stateid_seqid_inc(dst);
6998 else
6999 dst->seqid = lsp->ls_stateid.seqid;
7000 ret = true;
7001 out:
7002 spin_unlock(&state->state_lock);
7003 return ret;
7004 }
7005
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7006 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
7007 struct nfs4_lock_state *lsp)
7008 {
7009 struct nfs4_state *state = lsp->ls_state;
7010 bool ret;
7011
7012 spin_lock(&state->state_lock);
7013 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
7014 nfs4_stateid_copy(dst, &lsp->ls_stateid);
7015 spin_unlock(&state->state_lock);
7016 return ret;
7017 }
7018
7019 struct nfs4_unlockdata {
7020 struct nfs_locku_args arg;
7021 struct nfs_locku_res res;
7022 struct nfs4_lock_state *lsp;
7023 struct nfs_open_context *ctx;
7024 struct nfs_lock_context *l_ctx;
7025 struct file_lock fl;
7026 struct nfs_server *server;
7027 unsigned long timestamp;
7028 };
7029
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7030 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7031 struct nfs_open_context *ctx,
7032 struct nfs4_lock_state *lsp,
7033 struct nfs_seqid *seqid)
7034 {
7035 struct nfs4_unlockdata *p;
7036 struct nfs4_state *state = lsp->ls_state;
7037 struct inode *inode = state->inode;
7038
7039 p = kzalloc(sizeof(*p), GFP_KERNEL);
7040 if (p == NULL)
7041 return NULL;
7042 p->arg.fh = NFS_FH(inode);
7043 p->arg.fl = &p->fl;
7044 p->arg.seqid = seqid;
7045 p->res.seqid = seqid;
7046 p->lsp = lsp;
7047 /* Ensure we don't close file until we're done freeing locks! */
7048 p->ctx = get_nfs_open_context(ctx);
7049 p->l_ctx = nfs_get_lock_context(ctx);
7050 locks_init_lock(&p->fl);
7051 locks_copy_lock(&p->fl, fl);
7052 p->server = NFS_SERVER(inode);
7053 spin_lock(&state->state_lock);
7054 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7055 spin_unlock(&state->state_lock);
7056 return p;
7057 }
7058
nfs4_locku_release_calldata(void * data)7059 static void nfs4_locku_release_calldata(void *data)
7060 {
7061 struct nfs4_unlockdata *calldata = data;
7062 nfs_free_seqid(calldata->arg.seqid);
7063 nfs4_put_lock_state(calldata->lsp);
7064 nfs_put_lock_context(calldata->l_ctx);
7065 put_nfs_open_context(calldata->ctx);
7066 kfree(calldata);
7067 }
7068
nfs4_locku_done(struct rpc_task * task,void * data)7069 static void nfs4_locku_done(struct rpc_task *task, void *data)
7070 {
7071 struct nfs4_unlockdata *calldata = data;
7072 struct nfs4_exception exception = {
7073 .inode = calldata->lsp->ls_state->inode,
7074 .stateid = &calldata->arg.stateid,
7075 };
7076
7077 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7078 return;
7079 switch (task->tk_status) {
7080 case 0:
7081 renew_lease(calldata->server, calldata->timestamp);
7082 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
7083 if (nfs4_update_lock_stateid(calldata->lsp,
7084 &calldata->res.stateid))
7085 break;
7086 fallthrough;
7087 case -NFS4ERR_ADMIN_REVOKED:
7088 case -NFS4ERR_EXPIRED:
7089 nfs4_free_revoked_stateid(calldata->server,
7090 &calldata->arg.stateid,
7091 task->tk_msg.rpc_cred);
7092 fallthrough;
7093 case -NFS4ERR_BAD_STATEID:
7094 case -NFS4ERR_STALE_STATEID:
7095 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7096 calldata->lsp))
7097 rpc_restart_call_prepare(task);
7098 break;
7099 case -NFS4ERR_OLD_STATEID:
7100 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7101 calldata->lsp))
7102 rpc_restart_call_prepare(task);
7103 break;
7104 default:
7105 task->tk_status = nfs4_async_handle_exception(task,
7106 calldata->server, task->tk_status,
7107 &exception);
7108 if (exception.retry)
7109 rpc_restart_call_prepare(task);
7110 }
7111 nfs_release_seqid(calldata->arg.seqid);
7112 }
7113
nfs4_locku_prepare(struct rpc_task * task,void * data)7114 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7115 {
7116 struct nfs4_unlockdata *calldata = data;
7117
7118 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7119 nfs_async_iocounter_wait(task, calldata->l_ctx))
7120 return;
7121
7122 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7123 goto out_wait;
7124 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7125 /* Note: exit _without_ running nfs4_locku_done */
7126 goto out_no_action;
7127 }
7128 calldata->timestamp = jiffies;
7129 if (nfs4_setup_sequence(calldata->server->nfs_client,
7130 &calldata->arg.seq_args,
7131 &calldata->res.seq_res,
7132 task) != 0)
7133 nfs_release_seqid(calldata->arg.seqid);
7134 return;
7135 out_no_action:
7136 task->tk_action = NULL;
7137 out_wait:
7138 nfs4_sequence_done(task, &calldata->res.seq_res);
7139 }
7140
7141 static const struct rpc_call_ops nfs4_locku_ops = {
7142 .rpc_call_prepare = nfs4_locku_prepare,
7143 .rpc_call_done = nfs4_locku_done,
7144 .rpc_release = nfs4_locku_release_calldata,
7145 };
7146
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7147 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7148 struct nfs_open_context *ctx,
7149 struct nfs4_lock_state *lsp,
7150 struct nfs_seqid *seqid)
7151 {
7152 struct nfs4_unlockdata *data;
7153 struct rpc_message msg = {
7154 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7155 .rpc_cred = ctx->cred,
7156 };
7157 struct rpc_task_setup task_setup_data = {
7158 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7159 .rpc_message = &msg,
7160 .callback_ops = &nfs4_locku_ops,
7161 .workqueue = nfsiod_workqueue,
7162 .flags = RPC_TASK_ASYNC,
7163 };
7164
7165 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7166 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7167
7168 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7169 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7170
7171 /* Ensure this is an unlock - when canceling a lock, the
7172 * canceled lock is passed in, and it won't be an unlock.
7173 */
7174 fl->c.flc_type = F_UNLCK;
7175 if (fl->c.flc_flags & FL_CLOSE)
7176 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7177
7178 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7179 if (data == NULL) {
7180 nfs_free_seqid(seqid);
7181 return ERR_PTR(-ENOMEM);
7182 }
7183
7184 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7185 msg.rpc_argp = &data->arg;
7186 msg.rpc_resp = &data->res;
7187 task_setup_data.callback_data = data;
7188 return rpc_run_task(&task_setup_data);
7189 }
7190
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7191 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7192 {
7193 struct inode *inode = state->inode;
7194 struct nfs4_state_owner *sp = state->owner;
7195 struct nfs_inode *nfsi = NFS_I(inode);
7196 struct nfs_seqid *seqid;
7197 struct nfs4_lock_state *lsp;
7198 struct rpc_task *task;
7199 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7200 int status = 0;
7201 unsigned char saved_flags = request->c.flc_flags;
7202
7203 status = nfs4_set_lock_state(state, request);
7204 /* Unlock _before_ we do the RPC call */
7205 request->c.flc_flags |= FL_EXISTS;
7206 /* Exclude nfs_delegation_claim_locks() */
7207 mutex_lock(&sp->so_delegreturn_mutex);
7208 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7209 down_read(&nfsi->rwsem);
7210 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7211 up_read(&nfsi->rwsem);
7212 mutex_unlock(&sp->so_delegreturn_mutex);
7213 goto out;
7214 }
7215 lsp = request->fl_u.nfs4_fl.owner;
7216 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7217 up_read(&nfsi->rwsem);
7218 mutex_unlock(&sp->so_delegreturn_mutex);
7219 if (status != 0)
7220 goto out;
7221 /* Is this a delegated lock? */
7222 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7223 goto out;
7224 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7225 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7226 status = -ENOMEM;
7227 if (IS_ERR(seqid))
7228 goto out;
7229 task = nfs4_do_unlck(request,
7230 nfs_file_open_context(request->c.flc_file),
7231 lsp, seqid);
7232 status = PTR_ERR(task);
7233 if (IS_ERR(task))
7234 goto out;
7235 status = rpc_wait_for_completion_task(task);
7236 rpc_put_task(task);
7237 out:
7238 request->c.flc_flags = saved_flags;
7239 trace_nfs4_unlock(request, state, F_SETLK, status);
7240 return status;
7241 }
7242
7243 struct nfs4_lockdata {
7244 struct nfs_lock_args arg;
7245 struct nfs_lock_res res;
7246 struct nfs4_lock_state *lsp;
7247 struct nfs_open_context *ctx;
7248 struct file_lock fl;
7249 unsigned long timestamp;
7250 int rpc_status;
7251 int cancelled;
7252 struct nfs_server *server;
7253 };
7254
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7255 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7256 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7257 gfp_t gfp_mask)
7258 {
7259 struct nfs4_lockdata *p;
7260 struct inode *inode = lsp->ls_state->inode;
7261 struct nfs_server *server = NFS_SERVER(inode);
7262 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7263
7264 p = kzalloc(sizeof(*p), gfp_mask);
7265 if (p == NULL)
7266 return NULL;
7267
7268 p->arg.fh = NFS_FH(inode);
7269 p->arg.fl = &p->fl;
7270 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7271 if (IS_ERR(p->arg.open_seqid))
7272 goto out_free;
7273 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7274 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7275 if (IS_ERR(p->arg.lock_seqid))
7276 goto out_free_seqid;
7277 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7278 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7279 p->arg.lock_owner.s_dev = server->s_dev;
7280 p->res.lock_seqid = p->arg.lock_seqid;
7281 p->lsp = lsp;
7282 p->server = server;
7283 p->ctx = get_nfs_open_context(ctx);
7284 locks_init_lock(&p->fl);
7285 locks_copy_lock(&p->fl, fl);
7286 return p;
7287 out_free_seqid:
7288 nfs_free_seqid(p->arg.open_seqid);
7289 out_free:
7290 kfree(p);
7291 return NULL;
7292 }
7293
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7294 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7295 {
7296 struct nfs4_lockdata *data = calldata;
7297 struct nfs4_state *state = data->lsp->ls_state;
7298
7299 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7300 goto out_wait;
7301 /* Do we need to do an open_to_lock_owner? */
7302 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7303 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7304 goto out_release_lock_seqid;
7305 }
7306 nfs4_stateid_copy(&data->arg.open_stateid,
7307 &state->open_stateid);
7308 data->arg.new_lock_owner = 1;
7309 data->res.open_seqid = data->arg.open_seqid;
7310 } else {
7311 data->arg.new_lock_owner = 0;
7312 nfs4_stateid_copy(&data->arg.lock_stateid,
7313 &data->lsp->ls_stateid);
7314 }
7315 if (!nfs4_valid_open_stateid(state)) {
7316 data->rpc_status = -EBADF;
7317 task->tk_action = NULL;
7318 goto out_release_open_seqid;
7319 }
7320 data->timestamp = jiffies;
7321 if (nfs4_setup_sequence(data->server->nfs_client,
7322 &data->arg.seq_args,
7323 &data->res.seq_res,
7324 task) == 0)
7325 return;
7326 out_release_open_seqid:
7327 nfs_release_seqid(data->arg.open_seqid);
7328 out_release_lock_seqid:
7329 nfs_release_seqid(data->arg.lock_seqid);
7330 out_wait:
7331 nfs4_sequence_done(task, &data->res.seq_res);
7332 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7333 }
7334
nfs4_lock_done(struct rpc_task * task,void * calldata)7335 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7336 {
7337 struct nfs4_lockdata *data = calldata;
7338 struct nfs4_lock_state *lsp = data->lsp;
7339
7340 if (!nfs4_sequence_done(task, &data->res.seq_res))
7341 return;
7342
7343 data->rpc_status = task->tk_status;
7344 switch (task->tk_status) {
7345 case 0:
7346 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7347 data->timestamp);
7348 if (data->arg.new_lock && !data->cancelled) {
7349 data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7350 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7351 goto out_restart;
7352 }
7353 if (data->arg.new_lock_owner != 0) {
7354 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7355 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7356 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7357 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7358 goto out_restart;
7359 break;
7360 case -NFS4ERR_OLD_STATEID:
7361 if (data->arg.new_lock_owner != 0 &&
7362 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7363 lsp->ls_state))
7364 goto out_restart;
7365 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7366 goto out_restart;
7367 fallthrough;
7368 case -NFS4ERR_BAD_STATEID:
7369 case -NFS4ERR_STALE_STATEID:
7370 case -NFS4ERR_EXPIRED:
7371 if (data->arg.new_lock_owner != 0) {
7372 if (!nfs4_stateid_match(&data->arg.open_stateid,
7373 &lsp->ls_state->open_stateid))
7374 goto out_restart;
7375 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7376 &lsp->ls_stateid))
7377 goto out_restart;
7378 }
7379 out_done:
7380 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7381 return;
7382 out_restart:
7383 if (!data->cancelled)
7384 rpc_restart_call_prepare(task);
7385 goto out_done;
7386 }
7387
nfs4_lock_release(void * calldata)7388 static void nfs4_lock_release(void *calldata)
7389 {
7390 struct nfs4_lockdata *data = calldata;
7391
7392 nfs_free_seqid(data->arg.open_seqid);
7393 if (data->cancelled && data->rpc_status == 0) {
7394 struct rpc_task *task;
7395 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7396 data->arg.lock_seqid);
7397 if (!IS_ERR(task))
7398 rpc_put_task_async(task);
7399 dprintk("%s: cancelling lock!\n", __func__);
7400 } else
7401 nfs_free_seqid(data->arg.lock_seqid);
7402 nfs4_put_lock_state(data->lsp);
7403 put_nfs_open_context(data->ctx);
7404 kfree(data);
7405 }
7406
7407 static const struct rpc_call_ops nfs4_lock_ops = {
7408 .rpc_call_prepare = nfs4_lock_prepare,
7409 .rpc_call_done = nfs4_lock_done,
7410 .rpc_release = nfs4_lock_release,
7411 };
7412
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7413 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7414 {
7415 switch (error) {
7416 case -NFS4ERR_ADMIN_REVOKED:
7417 case -NFS4ERR_EXPIRED:
7418 case -NFS4ERR_BAD_STATEID:
7419 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7420 if (new_lock_owner != 0 ||
7421 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7422 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7423 break;
7424 case -NFS4ERR_STALE_STATEID:
7425 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7426 nfs4_schedule_lease_recovery(server->nfs_client);
7427 }
7428 }
7429
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7430 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7431 {
7432 struct nfs4_lockdata *data;
7433 struct rpc_task *task;
7434 struct rpc_message msg = {
7435 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7436 .rpc_cred = state->owner->so_cred,
7437 };
7438 struct rpc_task_setup task_setup_data = {
7439 .rpc_client = NFS_CLIENT(state->inode),
7440 .rpc_message = &msg,
7441 .callback_ops = &nfs4_lock_ops,
7442 .workqueue = nfsiod_workqueue,
7443 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7444 };
7445 int ret;
7446
7447 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7448 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7449
7450 data = nfs4_alloc_lockdata(fl,
7451 nfs_file_open_context(fl->c.flc_file),
7452 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7453 if (data == NULL)
7454 return -ENOMEM;
7455 if (IS_SETLKW(cmd))
7456 data->arg.block = 1;
7457 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7458 recovery_type > NFS_LOCK_NEW);
7459 msg.rpc_argp = &data->arg;
7460 msg.rpc_resp = &data->res;
7461 task_setup_data.callback_data = data;
7462 if (recovery_type > NFS_LOCK_NEW) {
7463 if (recovery_type == NFS_LOCK_RECLAIM)
7464 data->arg.reclaim = NFS_LOCK_RECLAIM;
7465 } else
7466 data->arg.new_lock = 1;
7467 task = rpc_run_task(&task_setup_data);
7468 if (IS_ERR(task))
7469 return PTR_ERR(task);
7470 ret = rpc_wait_for_completion_task(task);
7471 if (ret == 0) {
7472 ret = data->rpc_status;
7473 if (ret)
7474 nfs4_handle_setlk_error(data->server, data->lsp,
7475 data->arg.new_lock_owner, ret);
7476 } else
7477 data->cancelled = true;
7478 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7479 rpc_put_task(task);
7480 dprintk("%s: ret = %d\n", __func__, ret);
7481 return ret;
7482 }
7483
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7484 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7485 {
7486 struct nfs_server *server = NFS_SERVER(state->inode);
7487 struct nfs4_exception exception = {
7488 .inode = state->inode,
7489 };
7490 int err;
7491
7492 do {
7493 /* Cache the lock if possible... */
7494 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7495 return 0;
7496 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7497 if (err != -NFS4ERR_DELAY)
7498 break;
7499 nfs4_handle_exception(server, err, &exception);
7500 } while (exception.retry);
7501 return err;
7502 }
7503
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7504 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7505 {
7506 struct nfs_server *server = NFS_SERVER(state->inode);
7507 struct nfs4_exception exception = {
7508 .inode = state->inode,
7509 };
7510 int err;
7511
7512 err = nfs4_set_lock_state(state, request);
7513 if (err != 0)
7514 return err;
7515 if (!recover_lost_locks) {
7516 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7517 return 0;
7518 }
7519 do {
7520 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7521 return 0;
7522 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7523 switch (err) {
7524 default:
7525 goto out;
7526 case -NFS4ERR_GRACE:
7527 case -NFS4ERR_DELAY:
7528 nfs4_handle_exception(server, err, &exception);
7529 err = 0;
7530 }
7531 } while (exception.retry);
7532 out:
7533 return err;
7534 }
7535
7536 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7537 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7538 {
7539 struct nfs4_lock_state *lsp;
7540 int status;
7541
7542 status = nfs4_set_lock_state(state, request);
7543 if (status != 0)
7544 return status;
7545 lsp = request->fl_u.nfs4_fl.owner;
7546 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7547 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7548 return 0;
7549 return nfs4_lock_expired(state, request);
7550 }
7551 #endif
7552
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7553 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7554 {
7555 struct nfs_inode *nfsi = NFS_I(state->inode);
7556 struct nfs4_state_owner *sp = state->owner;
7557 unsigned char flags = request->c.flc_flags;
7558 int status;
7559
7560 request->c.flc_flags |= FL_ACCESS;
7561 status = locks_lock_inode_wait(state->inode, request);
7562 if (status < 0)
7563 goto out;
7564 mutex_lock(&sp->so_delegreturn_mutex);
7565 down_read(&nfsi->rwsem);
7566 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7567 /* Yes: cache locks! */
7568 /* ...but avoid races with delegation recall... */
7569 request->c.flc_flags = flags & ~FL_SLEEP;
7570 status = locks_lock_inode_wait(state->inode, request);
7571 up_read(&nfsi->rwsem);
7572 mutex_unlock(&sp->so_delegreturn_mutex);
7573 goto out;
7574 }
7575 up_read(&nfsi->rwsem);
7576 mutex_unlock(&sp->so_delegreturn_mutex);
7577 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7578 out:
7579 request->c.flc_flags = flags;
7580 return status;
7581 }
7582
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7583 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7584 {
7585 struct nfs4_exception exception = {
7586 .state = state,
7587 .inode = state->inode,
7588 .interruptible = true,
7589 };
7590 int err;
7591
7592 do {
7593 err = _nfs4_proc_setlk(state, cmd, request);
7594 if (err == -NFS4ERR_DENIED)
7595 err = -EAGAIN;
7596 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7597 err, &exception);
7598 } while (exception.retry);
7599 return err;
7600 }
7601
7602 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7603 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7604
7605 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7606 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7607 struct file_lock *request)
7608 {
7609 int status = -ERESTARTSYS;
7610 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7611
7612 while(!signalled()) {
7613 status = nfs4_proc_setlk(state, cmd, request);
7614 if ((status != -EAGAIN) || IS_SETLK(cmd))
7615 break;
7616 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7617 schedule_timeout(timeout);
7618 timeout *= 2;
7619 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7620 status = -ERESTARTSYS;
7621 }
7622 return status;
7623 }
7624
7625 #ifdef CONFIG_NFS_V4_1
7626 struct nfs4_lock_waiter {
7627 struct inode *inode;
7628 struct nfs_lowner owner;
7629 wait_queue_entry_t wait;
7630 };
7631
7632 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7633 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7634 {
7635 struct nfs4_lock_waiter *waiter =
7636 container_of(wait, struct nfs4_lock_waiter, wait);
7637
7638 /* NULL key means to wake up everyone */
7639 if (key) {
7640 struct cb_notify_lock_args *cbnl = key;
7641 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7642 *wowner = &waiter->owner;
7643
7644 /* Only wake if the callback was for the same owner. */
7645 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7646 return 0;
7647
7648 /* Make sure it's for the right inode */
7649 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7650 return 0;
7651 }
7652
7653 return woken_wake_function(wait, mode, flags, key);
7654 }
7655
7656 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7657 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7658 {
7659 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7660 struct nfs_server *server = NFS_SERVER(state->inode);
7661 struct nfs_client *clp = server->nfs_client;
7662 wait_queue_head_t *q = &clp->cl_lock_waitq;
7663 struct nfs4_lock_waiter waiter = {
7664 .inode = state->inode,
7665 .owner = { .clientid = clp->cl_clientid,
7666 .id = lsp->ls_seqid.owner_id,
7667 .s_dev = server->s_dev },
7668 };
7669 int status;
7670
7671 /* Don't bother with waitqueue if we don't expect a callback */
7672 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7673 return nfs4_retry_setlk_simple(state, cmd, request);
7674
7675 init_wait(&waiter.wait);
7676 waiter.wait.func = nfs4_wake_lock_waiter;
7677 add_wait_queue(q, &waiter.wait);
7678
7679 do {
7680 status = nfs4_proc_setlk(state, cmd, request);
7681 if (status != -EAGAIN || IS_SETLK(cmd))
7682 break;
7683
7684 status = -ERESTARTSYS;
7685 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7686 NFS4_LOCK_MAXTIMEOUT);
7687 } while (!signalled());
7688
7689 remove_wait_queue(q, &waiter.wait);
7690
7691 return status;
7692 }
7693 #else /* !CONFIG_NFS_V4_1 */
7694 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7695 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7696 {
7697 return nfs4_retry_setlk_simple(state, cmd, request);
7698 }
7699 #endif
7700
7701 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7702 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7703 {
7704 struct nfs_open_context *ctx;
7705 struct nfs4_state *state;
7706 int status;
7707
7708 /* verify open state */
7709 ctx = nfs_file_open_context(filp);
7710 state = ctx->state;
7711
7712 if (IS_GETLK(cmd)) {
7713 if (state != NULL)
7714 return nfs4_proc_getlk(state, F_GETLK, request);
7715 return 0;
7716 }
7717
7718 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7719 return -EINVAL;
7720
7721 if (lock_is_unlock(request)) {
7722 if (state != NULL)
7723 return nfs4_proc_unlck(state, cmd, request);
7724 return 0;
7725 }
7726
7727 if (state == NULL)
7728 return -ENOLCK;
7729
7730 if ((request->c.flc_flags & FL_POSIX) &&
7731 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7732 return -ENOLCK;
7733
7734 /*
7735 * Don't rely on the VFS having checked the file open mode,
7736 * since it won't do this for flock() locks.
7737 */
7738 switch (request->c.flc_type) {
7739 case F_RDLCK:
7740 if (!(filp->f_mode & FMODE_READ))
7741 return -EBADF;
7742 break;
7743 case F_WRLCK:
7744 if (!(filp->f_mode & FMODE_WRITE))
7745 return -EBADF;
7746 }
7747
7748 status = nfs4_set_lock_state(state, request);
7749 if (status != 0)
7750 return status;
7751
7752 return nfs4_retry_setlk(state, cmd, request);
7753 }
7754
nfs4_delete_lease(struct file * file,void ** priv)7755 static int nfs4_delete_lease(struct file *file, void **priv)
7756 {
7757 return generic_setlease(file, F_UNLCK, NULL, priv);
7758 }
7759
nfs4_add_lease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7760 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7761 void **priv)
7762 {
7763 struct inode *inode = file_inode(file);
7764 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7765 int ret;
7766
7767 /* No delegation, no lease */
7768 if (!nfs4_have_delegation(inode, type, 0))
7769 return -EAGAIN;
7770 ret = generic_setlease(file, arg, lease, priv);
7771 if (ret || nfs4_have_delegation(inode, type, 0))
7772 return ret;
7773 /* We raced with a delegation return */
7774 nfs4_delete_lease(file, priv);
7775 return -EAGAIN;
7776 }
7777
nfs4_proc_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7778 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7779 void **priv)
7780 {
7781 switch (arg) {
7782 case F_RDLCK:
7783 case F_WRLCK:
7784 return nfs4_add_lease(file, arg, lease, priv);
7785 case F_UNLCK:
7786 return nfs4_delete_lease(file, priv);
7787 default:
7788 return -EINVAL;
7789 }
7790 }
7791
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7792 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7793 {
7794 struct nfs_server *server = NFS_SERVER(state->inode);
7795 int err;
7796
7797 err = nfs4_set_lock_state(state, fl);
7798 if (err != 0)
7799 return err;
7800 do {
7801 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7802 if (err != -NFS4ERR_DELAY)
7803 break;
7804 ssleep(1);
7805 } while (err == -NFS4ERR_DELAY);
7806 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7807 }
7808
7809 struct nfs_release_lockowner_data {
7810 struct nfs4_lock_state *lsp;
7811 struct nfs_server *server;
7812 struct nfs_release_lockowner_args args;
7813 struct nfs_release_lockowner_res res;
7814 unsigned long timestamp;
7815 };
7816
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7817 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7818 {
7819 struct nfs_release_lockowner_data *data = calldata;
7820 struct nfs_server *server = data->server;
7821 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7822 &data->res.seq_res, task);
7823 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7824 data->timestamp = jiffies;
7825 }
7826
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7827 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7828 {
7829 struct nfs_release_lockowner_data *data = calldata;
7830 struct nfs_server *server = data->server;
7831
7832 nfs40_sequence_done(task, &data->res.seq_res);
7833
7834 switch (task->tk_status) {
7835 case 0:
7836 renew_lease(server, data->timestamp);
7837 break;
7838 case -NFS4ERR_STALE_CLIENTID:
7839 case -NFS4ERR_EXPIRED:
7840 nfs4_schedule_lease_recovery(server->nfs_client);
7841 break;
7842 case -NFS4ERR_LEASE_MOVED:
7843 case -NFS4ERR_DELAY:
7844 if (nfs4_async_handle_error(task, server,
7845 NULL, NULL) == -EAGAIN)
7846 rpc_restart_call_prepare(task);
7847 }
7848 }
7849
nfs4_release_lockowner_release(void * calldata)7850 static void nfs4_release_lockowner_release(void *calldata)
7851 {
7852 struct nfs_release_lockowner_data *data = calldata;
7853 nfs4_free_lock_state(data->server, data->lsp);
7854 kfree(calldata);
7855 }
7856
7857 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7858 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7859 .rpc_call_done = nfs4_release_lockowner_done,
7860 .rpc_release = nfs4_release_lockowner_release,
7861 };
7862
7863 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7864 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7865 {
7866 struct nfs_release_lockowner_data *data;
7867 struct rpc_message msg = {
7868 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7869 };
7870
7871 if (server->nfs_client->cl_mvops->minor_version != 0)
7872 return;
7873
7874 data = kmalloc(sizeof(*data), GFP_KERNEL);
7875 if (!data)
7876 return;
7877 data->lsp = lsp;
7878 data->server = server;
7879 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7880 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7881 data->args.lock_owner.s_dev = server->s_dev;
7882
7883 msg.rpc_argp = &data->args;
7884 msg.rpc_resp = &data->res;
7885 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7886 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7887 }
7888
7889 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7890
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7891 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7892 struct mnt_idmap *idmap,
7893 struct dentry *unused, struct inode *inode,
7894 const char *key, const void *buf,
7895 size_t buflen, int flags)
7896 {
7897 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7898 }
7899
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7900 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7901 struct dentry *unused, struct inode *inode,
7902 const char *key, void *buf, size_t buflen)
7903 {
7904 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7905 }
7906
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7907 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7908 {
7909 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7910 }
7911
7912 #if defined(CONFIG_NFS_V4_1)
7913 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7914
nfs4_xattr_set_nfs4_dacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7915 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7916 struct mnt_idmap *idmap,
7917 struct dentry *unused, struct inode *inode,
7918 const char *key, const void *buf,
7919 size_t buflen, int flags)
7920 {
7921 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7922 }
7923
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7924 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7925 struct dentry *unused, struct inode *inode,
7926 const char *key, void *buf, size_t buflen)
7927 {
7928 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7929 }
7930
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7931 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7932 {
7933 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7934 }
7935
7936 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7937
nfs4_xattr_set_nfs4_sacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7938 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7939 struct mnt_idmap *idmap,
7940 struct dentry *unused, struct inode *inode,
7941 const char *key, const void *buf,
7942 size_t buflen, int flags)
7943 {
7944 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7945 }
7946
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7947 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7948 struct dentry *unused, struct inode *inode,
7949 const char *key, void *buf, size_t buflen)
7950 {
7951 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7952 }
7953
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7954 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7955 {
7956 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7957 }
7958
7959 #endif
7960
7961 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7962
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7963 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7964 struct mnt_idmap *idmap,
7965 struct dentry *unused, struct inode *inode,
7966 const char *key, const void *buf,
7967 size_t buflen, int flags)
7968 {
7969 if (security_ismaclabel(key))
7970 return nfs4_set_security_label(inode, buf, buflen);
7971
7972 return -EOPNOTSUPP;
7973 }
7974
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7975 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7976 struct dentry *unused, struct inode *inode,
7977 const char *key, void *buf, size_t buflen)
7978 {
7979 if (security_ismaclabel(key))
7980 return nfs4_get_security_label(inode, buf, buflen);
7981 return -EOPNOTSUPP;
7982 }
7983
7984 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7985 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7986 {
7987 int len = 0;
7988
7989 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7990 len = security_inode_listsecurity(inode, list, list_len);
7991 if (len >= 0 && list_len && len > list_len)
7992 return -ERANGE;
7993 }
7994 return len;
7995 }
7996
7997 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7998 .prefix = XATTR_SECURITY_PREFIX,
7999 .get = nfs4_xattr_get_nfs4_label,
8000 .set = nfs4_xattr_set_nfs4_label,
8001 };
8002
8003 #else
8004
8005 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)8006 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
8007 {
8008 return 0;
8009 }
8010
8011 #endif
8012
8013 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)8014 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
8015 struct mnt_idmap *idmap,
8016 struct dentry *unused, struct inode *inode,
8017 const char *key, const void *buf,
8018 size_t buflen, int flags)
8019 {
8020 u32 mask;
8021 int ret;
8022
8023 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8024 return -EOPNOTSUPP;
8025
8026 /*
8027 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
8028 * flags right now. Handling of xattr operations use the normal
8029 * file read/write permissions.
8030 *
8031 * Just in case the server has other ideas (which RFC 8276 allows),
8032 * do a cached access check for the XA* flags to possibly avoid
8033 * doing an RPC and getting EACCES back.
8034 */
8035 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8036 if (!(mask & NFS_ACCESS_XAWRITE))
8037 return -EACCES;
8038 }
8039
8040 if (buf == NULL) {
8041 ret = nfs42_proc_removexattr(inode, key);
8042 if (!ret)
8043 nfs4_xattr_cache_remove(inode, key);
8044 } else {
8045 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
8046 if (!ret)
8047 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
8048 }
8049
8050 return ret;
8051 }
8052
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8053 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
8054 struct dentry *unused, struct inode *inode,
8055 const char *key, void *buf, size_t buflen)
8056 {
8057 u32 mask;
8058 ssize_t ret;
8059
8060 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8061 return -EOPNOTSUPP;
8062
8063 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8064 if (!(mask & NFS_ACCESS_XAREAD))
8065 return -EACCES;
8066 }
8067
8068 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8069 if (ret)
8070 return ret;
8071
8072 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
8073 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8074 return ret;
8075
8076 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
8077
8078 return ret;
8079 }
8080
8081 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8082 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8083 {
8084 u64 cookie;
8085 bool eof;
8086 ssize_t ret, size;
8087 char *buf;
8088 size_t buflen;
8089 u32 mask;
8090
8091 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8092 return 0;
8093
8094 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8095 if (!(mask & NFS_ACCESS_XALIST))
8096 return 0;
8097 }
8098
8099 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8100 if (ret)
8101 return ret;
8102
8103 ret = nfs4_xattr_cache_list(inode, list, list_len);
8104 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8105 return ret;
8106
8107 cookie = 0;
8108 eof = false;
8109 buflen = list_len ? list_len : XATTR_LIST_MAX;
8110 buf = list_len ? list : NULL;
8111 size = 0;
8112
8113 while (!eof) {
8114 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8115 &cookie, &eof);
8116 if (ret < 0)
8117 return ret;
8118
8119 if (list_len) {
8120 buf += ret;
8121 buflen -= ret;
8122 }
8123 size += ret;
8124 }
8125
8126 if (list_len)
8127 nfs4_xattr_cache_set_list(inode, list, size);
8128
8129 return size;
8130 }
8131
8132 #else
8133
8134 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8135 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8136 {
8137 return 0;
8138 }
8139 #endif /* CONFIG_NFS_V4_2 */
8140
8141 /*
8142 * nfs_fhget will use either the mounted_on_fileid or the fileid
8143 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)8144 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8145 {
8146 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8147 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8148 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8149 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8150 return;
8151
8152 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8153 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8154 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8155 fattr->nlink = 2;
8156 }
8157
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8158 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8159 const struct qstr *name,
8160 struct nfs4_fs_locations *fs_locations,
8161 struct page *page)
8162 {
8163 struct nfs_server *server = NFS_SERVER(dir);
8164 u32 bitmask[3];
8165 struct nfs4_fs_locations_arg args = {
8166 .dir_fh = NFS_FH(dir),
8167 .name = name,
8168 .page = page,
8169 .bitmask = bitmask,
8170 };
8171 struct nfs4_fs_locations_res res = {
8172 .fs_locations = fs_locations,
8173 };
8174 struct rpc_message msg = {
8175 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8176 .rpc_argp = &args,
8177 .rpc_resp = &res,
8178 };
8179 int status;
8180
8181 dprintk("%s: start\n", __func__);
8182
8183 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8184 bitmask[1] = nfs4_fattr_bitmap[1];
8185
8186 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8187 * is not supported */
8188 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8189 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8190 else
8191 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8192
8193 nfs_fattr_init(fs_locations->fattr);
8194 fs_locations->server = server;
8195 fs_locations->nlocations = 0;
8196 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8197 dprintk("%s: returned status = %d\n", __func__, status);
8198 return status;
8199 }
8200
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8201 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8202 const struct qstr *name,
8203 struct nfs4_fs_locations *fs_locations,
8204 struct page *page)
8205 {
8206 struct nfs4_exception exception = {
8207 .interruptible = true,
8208 };
8209 int err;
8210 do {
8211 err = _nfs4_proc_fs_locations(client, dir, name,
8212 fs_locations, page);
8213 trace_nfs4_get_fs_locations(dir, name, err);
8214 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8215 &exception);
8216 } while (exception.retry);
8217 return err;
8218 }
8219
8220 /*
8221 * This operation also signals the server that this client is
8222 * performing migration recovery. The server can stop returning
8223 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
8224 * appended to this compound to identify the client ID which is
8225 * performing recovery.
8226 */
_nfs40_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8227 static int _nfs40_proc_get_locations(struct nfs_server *server,
8228 struct nfs_fh *fhandle,
8229 struct nfs4_fs_locations *locations,
8230 struct page *page, const struct cred *cred)
8231 {
8232 struct rpc_clnt *clnt = server->client;
8233 u32 bitmask[2] = {
8234 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8235 };
8236 struct nfs4_fs_locations_arg args = {
8237 .clientid = server->nfs_client->cl_clientid,
8238 .fh = fhandle,
8239 .page = page,
8240 .bitmask = bitmask,
8241 .migration = 1, /* skip LOOKUP */
8242 .renew = 1, /* append RENEW */
8243 };
8244 struct nfs4_fs_locations_res res = {
8245 .fs_locations = locations,
8246 .migration = 1,
8247 .renew = 1,
8248 };
8249 struct rpc_message msg = {
8250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8251 .rpc_argp = &args,
8252 .rpc_resp = &res,
8253 .rpc_cred = cred,
8254 };
8255 unsigned long now = jiffies;
8256 int status;
8257
8258 nfs_fattr_init(locations->fattr);
8259 locations->server = server;
8260 locations->nlocations = 0;
8261
8262 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8263 status = nfs4_call_sync_sequence(clnt, server, &msg,
8264 &args.seq_args, &res.seq_res);
8265 if (status)
8266 return status;
8267
8268 renew_lease(server, now);
8269 return 0;
8270 }
8271
8272 #ifdef CONFIG_NFS_V4_1
8273
8274 /*
8275 * This operation also signals the server that this client is
8276 * performing migration recovery. The server can stop asserting
8277 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8278 * performing this operation is identified in the SEQUENCE
8279 * operation in this compound.
8280 *
8281 * When the client supports GETATTR(fs_locations_info), it can
8282 * be plumbed in here.
8283 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8284 static int _nfs41_proc_get_locations(struct nfs_server *server,
8285 struct nfs_fh *fhandle,
8286 struct nfs4_fs_locations *locations,
8287 struct page *page, const struct cred *cred)
8288 {
8289 struct rpc_clnt *clnt = server->client;
8290 u32 bitmask[2] = {
8291 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8292 };
8293 struct nfs4_fs_locations_arg args = {
8294 .fh = fhandle,
8295 .page = page,
8296 .bitmask = bitmask,
8297 .migration = 1, /* skip LOOKUP */
8298 };
8299 struct nfs4_fs_locations_res res = {
8300 .fs_locations = locations,
8301 .migration = 1,
8302 };
8303 struct rpc_message msg = {
8304 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8305 .rpc_argp = &args,
8306 .rpc_resp = &res,
8307 .rpc_cred = cred,
8308 };
8309 struct nfs4_call_sync_data data = {
8310 .seq_server = server,
8311 .seq_args = &args.seq_args,
8312 .seq_res = &res.seq_res,
8313 };
8314 struct rpc_task_setup task_setup_data = {
8315 .rpc_client = clnt,
8316 .rpc_message = &msg,
8317 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8318 .callback_data = &data,
8319 .flags = RPC_TASK_NO_ROUND_ROBIN,
8320 };
8321 int status;
8322
8323 nfs_fattr_init(locations->fattr);
8324 locations->server = server;
8325 locations->nlocations = 0;
8326
8327 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8328 status = nfs4_call_sync_custom(&task_setup_data);
8329 if (status == NFS4_OK &&
8330 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8331 status = -NFS4ERR_LEASE_MOVED;
8332 return status;
8333 }
8334
8335 #endif /* CONFIG_NFS_V4_1 */
8336
8337 /**
8338 * nfs4_proc_get_locations - discover locations for a migrated FSID
8339 * @server: pointer to nfs_server to process
8340 * @fhandle: pointer to the kernel NFS client file handle
8341 * @locations: result of query
8342 * @page: buffer
8343 * @cred: credential to use for this operation
8344 *
8345 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8346 * operation failed, or a negative errno if a local error occurred.
8347 *
8348 * On success, "locations" is filled in, but if the server has
8349 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8350 * asserted.
8351 *
8352 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8353 * from this client that require migration recovery.
8354 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8355 int nfs4_proc_get_locations(struct nfs_server *server,
8356 struct nfs_fh *fhandle,
8357 struct nfs4_fs_locations *locations,
8358 struct page *page, const struct cred *cred)
8359 {
8360 struct nfs_client *clp = server->nfs_client;
8361 const struct nfs4_mig_recovery_ops *ops =
8362 clp->cl_mvops->mig_recovery_ops;
8363 struct nfs4_exception exception = {
8364 .interruptible = true,
8365 };
8366 int status;
8367
8368 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8369 (unsigned long long)server->fsid.major,
8370 (unsigned long long)server->fsid.minor,
8371 clp->cl_hostname);
8372 nfs_display_fhandle(fhandle, __func__);
8373
8374 do {
8375 status = ops->get_locations(server, fhandle, locations, page,
8376 cred);
8377 if (status != -NFS4ERR_DELAY)
8378 break;
8379 nfs4_handle_exception(server, status, &exception);
8380 } while (exception.retry);
8381 return status;
8382 }
8383
8384 /*
8385 * This operation also signals the server that this client is
8386 * performing "lease moved" recovery. The server can stop
8387 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
8388 * is appended to this compound to identify the client ID which is
8389 * performing recovery.
8390 */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)8391 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8392 {
8393 struct nfs_server *server = NFS_SERVER(inode);
8394 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8395 struct rpc_clnt *clnt = server->client;
8396 struct nfs4_fsid_present_arg args = {
8397 .fh = NFS_FH(inode),
8398 .clientid = clp->cl_clientid,
8399 .renew = 1, /* append RENEW */
8400 };
8401 struct nfs4_fsid_present_res res = {
8402 .renew = 1,
8403 };
8404 struct rpc_message msg = {
8405 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8406 .rpc_argp = &args,
8407 .rpc_resp = &res,
8408 .rpc_cred = cred,
8409 };
8410 unsigned long now = jiffies;
8411 int status;
8412
8413 res.fh = nfs_alloc_fhandle();
8414 if (res.fh == NULL)
8415 return -ENOMEM;
8416
8417 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8418 status = nfs4_call_sync_sequence(clnt, server, &msg,
8419 &args.seq_args, &res.seq_res);
8420 nfs_free_fhandle(res.fh);
8421 if (status)
8422 return status;
8423
8424 do_renew_lease(clp, now);
8425 return 0;
8426 }
8427
8428 #ifdef CONFIG_NFS_V4_1
8429
8430 /*
8431 * This operation also signals the server that this client is
8432 * performing "lease moved" recovery. The server can stop asserting
8433 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8434 * this operation is identified in the SEQUENCE operation in this
8435 * compound.
8436 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8437 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8438 {
8439 struct nfs_server *server = NFS_SERVER(inode);
8440 struct rpc_clnt *clnt = server->client;
8441 struct nfs4_fsid_present_arg args = {
8442 .fh = NFS_FH(inode),
8443 };
8444 struct nfs4_fsid_present_res res = {
8445 };
8446 struct rpc_message msg = {
8447 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8448 .rpc_argp = &args,
8449 .rpc_resp = &res,
8450 .rpc_cred = cred,
8451 };
8452 int status;
8453
8454 res.fh = nfs_alloc_fhandle();
8455 if (res.fh == NULL)
8456 return -ENOMEM;
8457
8458 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8459 status = nfs4_call_sync_sequence(clnt, server, &msg,
8460 &args.seq_args, &res.seq_res);
8461 nfs_free_fhandle(res.fh);
8462 if (status == NFS4_OK &&
8463 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8464 status = -NFS4ERR_LEASE_MOVED;
8465 return status;
8466 }
8467
8468 #endif /* CONFIG_NFS_V4_1 */
8469
8470 /**
8471 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8472 * @inode: inode on FSID to check
8473 * @cred: credential to use for this operation
8474 *
8475 * Server indicates whether the FSID is present, moved, or not
8476 * recognized. This operation is necessary to clear a LEASE_MOVED
8477 * condition for this client ID.
8478 *
8479 * Returns NFS4_OK if the FSID is present on this server,
8480 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8481 * NFS4ERR code if some error occurred on the server, or a
8482 * negative errno if a local failure occurred.
8483 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8484 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8485 {
8486 struct nfs_server *server = NFS_SERVER(inode);
8487 struct nfs_client *clp = server->nfs_client;
8488 const struct nfs4_mig_recovery_ops *ops =
8489 clp->cl_mvops->mig_recovery_ops;
8490 struct nfs4_exception exception = {
8491 .interruptible = true,
8492 };
8493 int status;
8494
8495 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8496 (unsigned long long)server->fsid.major,
8497 (unsigned long long)server->fsid.minor,
8498 clp->cl_hostname);
8499 nfs_display_fhandle(NFS_FH(inode), __func__);
8500
8501 do {
8502 status = ops->fsid_present(inode, cred);
8503 if (status != -NFS4ERR_DELAY)
8504 break;
8505 nfs4_handle_exception(server, status, &exception);
8506 } while (exception.retry);
8507 return status;
8508 }
8509
8510 /*
8511 * If 'use_integrity' is true and the state managment nfs_client
8512 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8513 * and the machine credential as per RFC3530bis and RFC5661 Security
8514 * Considerations sections. Otherwise, just use the user cred with the
8515 * filesystem's rpc_client.
8516 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8517 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8518 {
8519 int status;
8520 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8521 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8522 struct nfs4_secinfo_arg args = {
8523 .dir_fh = NFS_FH(dir),
8524 .name = name,
8525 };
8526 struct nfs4_secinfo_res res = {
8527 .flavors = flavors,
8528 };
8529 struct rpc_message msg = {
8530 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8531 .rpc_argp = &args,
8532 .rpc_resp = &res,
8533 };
8534 struct nfs4_call_sync_data data = {
8535 .seq_server = NFS_SERVER(dir),
8536 .seq_args = &args.seq_args,
8537 .seq_res = &res.seq_res,
8538 };
8539 struct rpc_task_setup task_setup = {
8540 .rpc_client = clnt,
8541 .rpc_message = &msg,
8542 .callback_ops = clp->cl_mvops->call_sync_ops,
8543 .callback_data = &data,
8544 .flags = RPC_TASK_NO_ROUND_ROBIN,
8545 };
8546 const struct cred *cred = NULL;
8547
8548 if (use_integrity) {
8549 clnt = clp->cl_rpcclient;
8550 task_setup.rpc_client = clnt;
8551
8552 cred = nfs4_get_clid_cred(clp);
8553 msg.rpc_cred = cred;
8554 }
8555
8556 dprintk("NFS call secinfo %s\n", name->name);
8557
8558 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8559 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8560 status = nfs4_call_sync_custom(&task_setup);
8561
8562 dprintk("NFS reply secinfo: %d\n", status);
8563
8564 put_cred(cred);
8565 return status;
8566 }
8567
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8568 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8569 struct nfs4_secinfo_flavors *flavors)
8570 {
8571 struct nfs4_exception exception = {
8572 .interruptible = true,
8573 };
8574 int err;
8575 do {
8576 err = -NFS4ERR_WRONGSEC;
8577
8578 /* try to use integrity protection with machine cred */
8579 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8580 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8581
8582 /*
8583 * if unable to use integrity protection, or SECINFO with
8584 * integrity protection returns NFS4ERR_WRONGSEC (which is
8585 * disallowed by spec, but exists in deployed servers) use
8586 * the current filesystem's rpc_client and the user cred.
8587 */
8588 if (err == -NFS4ERR_WRONGSEC)
8589 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8590
8591 trace_nfs4_secinfo(dir, name, err);
8592 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8593 &exception);
8594 } while (exception.retry);
8595 return err;
8596 }
8597
8598 #ifdef CONFIG_NFS_V4_1
8599 /*
8600 * Check the exchange flags returned by the server for invalid flags, having
8601 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8602 * DS flags set.
8603 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8604 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8605 {
8606 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8607 goto out_inval;
8608 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8609 goto out_inval;
8610 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8611 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8612 goto out_inval;
8613 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8614 goto out_inval;
8615 return NFS_OK;
8616 out_inval:
8617 return -NFS4ERR_INVAL;
8618 }
8619
8620 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8621 nfs41_same_server_scope(struct nfs41_server_scope *a,
8622 struct nfs41_server_scope *b)
8623 {
8624 if (a->server_scope_sz != b->server_scope_sz)
8625 return false;
8626 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8627 }
8628
8629 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8630 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8631 {
8632 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8633 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8634 struct nfs_client *clp = args->client;
8635
8636 switch (task->tk_status) {
8637 case -NFS4ERR_BADSESSION:
8638 case -NFS4ERR_DEADSESSION:
8639 nfs4_schedule_session_recovery(clp->cl_session,
8640 task->tk_status);
8641 return;
8642 }
8643 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8644 res->dir != NFS4_CDFS4_BOTH) {
8645 rpc_task_close_connection(task);
8646 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8647 rpc_restart_call(task);
8648 }
8649 }
8650
8651 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8652 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8653 };
8654
8655 /*
8656 * nfs4_proc_bind_one_conn_to_session()
8657 *
8658 * The 4.1 client currently uses the same TCP connection for the
8659 * fore and backchannel.
8660 */
8661 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8662 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8663 struct rpc_xprt *xprt,
8664 struct nfs_client *clp,
8665 const struct cred *cred)
8666 {
8667 int status;
8668 struct nfs41_bind_conn_to_session_args args = {
8669 .client = clp,
8670 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8671 .retries = 0,
8672 };
8673 struct nfs41_bind_conn_to_session_res res;
8674 struct rpc_message msg = {
8675 .rpc_proc =
8676 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8677 .rpc_argp = &args,
8678 .rpc_resp = &res,
8679 .rpc_cred = cred,
8680 };
8681 struct rpc_task_setup task_setup_data = {
8682 .rpc_client = clnt,
8683 .rpc_xprt = xprt,
8684 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8685 .rpc_message = &msg,
8686 .flags = RPC_TASK_TIMEOUT,
8687 };
8688 struct rpc_task *task;
8689
8690 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8691 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8692 args.dir = NFS4_CDFC4_FORE;
8693
8694 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8695 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8696 args.dir = NFS4_CDFC4_FORE;
8697
8698 task = rpc_run_task(&task_setup_data);
8699 if (!IS_ERR(task)) {
8700 status = task->tk_status;
8701 rpc_put_task(task);
8702 } else
8703 status = PTR_ERR(task);
8704 trace_nfs4_bind_conn_to_session(clp, status);
8705 if (status == 0) {
8706 if (memcmp(res.sessionid.data,
8707 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8708 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8709 return -EIO;
8710 }
8711 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8712 dprintk("NFS: %s: Unexpected direction from server\n",
8713 __func__);
8714 return -EIO;
8715 }
8716 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8717 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8718 __func__);
8719 return -EIO;
8720 }
8721 }
8722
8723 return status;
8724 }
8725
8726 struct rpc_bind_conn_calldata {
8727 struct nfs_client *clp;
8728 const struct cred *cred;
8729 };
8730
8731 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8732 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8733 struct rpc_xprt *xprt,
8734 void *calldata)
8735 {
8736 struct rpc_bind_conn_calldata *p = calldata;
8737
8738 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8739 }
8740
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8741 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8742 {
8743 struct rpc_bind_conn_calldata data = {
8744 .clp = clp,
8745 .cred = cred,
8746 };
8747 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8748 nfs4_proc_bind_conn_to_session_callback, &data);
8749 }
8750
8751 /*
8752 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8753 * and operations we'd like to see to enable certain features in the allow map
8754 */
8755 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8756 .how = SP4_MACH_CRED,
8757 .enforce.u.words = {
8758 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8759 1 << (OP_EXCHANGE_ID - 32) |
8760 1 << (OP_CREATE_SESSION - 32) |
8761 1 << (OP_DESTROY_SESSION - 32) |
8762 1 << (OP_DESTROY_CLIENTID - 32)
8763 },
8764 .allow.u.words = {
8765 [0] = 1 << (OP_CLOSE) |
8766 1 << (OP_OPEN_DOWNGRADE) |
8767 1 << (OP_LOCKU) |
8768 1 << (OP_DELEGRETURN) |
8769 1 << (OP_COMMIT),
8770 [1] = 1 << (OP_SECINFO - 32) |
8771 1 << (OP_SECINFO_NO_NAME - 32) |
8772 1 << (OP_LAYOUTRETURN - 32) |
8773 1 << (OP_TEST_STATEID - 32) |
8774 1 << (OP_FREE_STATEID - 32) |
8775 1 << (OP_WRITE - 32)
8776 }
8777 };
8778
8779 /*
8780 * Select the state protection mode for client `clp' given the server results
8781 * from exchange_id in `sp'.
8782 *
8783 * Returns 0 on success, negative errno otherwise.
8784 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8785 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8786 struct nfs41_state_protection *sp)
8787 {
8788 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8789 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8790 1 << (OP_EXCHANGE_ID - 32) |
8791 1 << (OP_CREATE_SESSION - 32) |
8792 1 << (OP_DESTROY_SESSION - 32) |
8793 1 << (OP_DESTROY_CLIENTID - 32)
8794 };
8795 unsigned long flags = 0;
8796 unsigned int i;
8797 int ret = 0;
8798
8799 if (sp->how == SP4_MACH_CRED) {
8800 /* Print state protect result */
8801 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8802 for (i = 0; i <= LAST_NFS4_OP; i++) {
8803 if (test_bit(i, sp->enforce.u.longs))
8804 dfprintk(MOUNT, " enforce op %d\n", i);
8805 if (test_bit(i, sp->allow.u.longs))
8806 dfprintk(MOUNT, " allow op %d\n", i);
8807 }
8808
8809 /* make sure nothing is on enforce list that isn't supported */
8810 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8811 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8812 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8813 ret = -EINVAL;
8814 goto out;
8815 }
8816 }
8817
8818 /*
8819 * Minimal mode - state operations are allowed to use machine
8820 * credential. Note this already happens by default, so the
8821 * client doesn't have to do anything more than the negotiation.
8822 *
8823 * NOTE: we don't care if EXCHANGE_ID is in the list -
8824 * we're already using the machine cred for exchange_id
8825 * and will never use a different cred.
8826 */
8827 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8828 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8829 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8830 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8831 dfprintk(MOUNT, "sp4_mach_cred:\n");
8832 dfprintk(MOUNT, " minimal mode enabled\n");
8833 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8834 } else {
8835 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8836 ret = -EINVAL;
8837 goto out;
8838 }
8839
8840 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8841 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8842 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8843 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8844 dfprintk(MOUNT, " cleanup mode enabled\n");
8845 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8846 }
8847
8848 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8849 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8850 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8851 }
8852
8853 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8854 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8855 dfprintk(MOUNT, " secinfo mode enabled\n");
8856 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8857 }
8858
8859 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8860 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8861 dfprintk(MOUNT, " stateid mode enabled\n");
8862 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8863 }
8864
8865 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8866 dfprintk(MOUNT, " write mode enabled\n");
8867 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8868 }
8869
8870 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8871 dfprintk(MOUNT, " commit mode enabled\n");
8872 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8873 }
8874 }
8875 out:
8876 clp->cl_sp4_flags = flags;
8877 return ret;
8878 }
8879
8880 struct nfs41_exchange_id_data {
8881 struct nfs41_exchange_id_res res;
8882 struct nfs41_exchange_id_args args;
8883 };
8884
nfs4_exchange_id_release(void * data)8885 static void nfs4_exchange_id_release(void *data)
8886 {
8887 struct nfs41_exchange_id_data *cdata =
8888 (struct nfs41_exchange_id_data *)data;
8889
8890 nfs_put_client(cdata->args.client);
8891 kfree(cdata->res.impl_id);
8892 kfree(cdata->res.server_scope);
8893 kfree(cdata->res.server_owner);
8894 kfree(cdata);
8895 }
8896
8897 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8898 .rpc_release = nfs4_exchange_id_release,
8899 };
8900
8901 /*
8902 * _nfs4_proc_exchange_id()
8903 *
8904 * Wrapper for EXCHANGE_ID operation.
8905 */
8906 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8907 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8908 u32 sp4_how, struct rpc_xprt *xprt)
8909 {
8910 struct rpc_message msg = {
8911 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8912 .rpc_cred = cred,
8913 };
8914 struct rpc_task_setup task_setup_data = {
8915 .rpc_client = clp->cl_rpcclient,
8916 .callback_ops = &nfs4_exchange_id_call_ops,
8917 .rpc_message = &msg,
8918 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8919 };
8920 struct nfs41_exchange_id_data *calldata;
8921 int status;
8922
8923 if (!refcount_inc_not_zero(&clp->cl_count))
8924 return ERR_PTR(-EIO);
8925
8926 status = -ENOMEM;
8927 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8928 if (!calldata)
8929 goto out;
8930
8931 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8932
8933 status = nfs4_init_uniform_client_string(clp);
8934 if (status)
8935 goto out_calldata;
8936
8937 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8938 GFP_NOFS);
8939 status = -ENOMEM;
8940 if (unlikely(calldata->res.server_owner == NULL))
8941 goto out_calldata;
8942
8943 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8944 GFP_NOFS);
8945 if (unlikely(calldata->res.server_scope == NULL))
8946 goto out_server_owner;
8947
8948 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8949 if (unlikely(calldata->res.impl_id == NULL))
8950 goto out_server_scope;
8951
8952 switch (sp4_how) {
8953 case SP4_NONE:
8954 calldata->args.state_protect.how = SP4_NONE;
8955 break;
8956
8957 case SP4_MACH_CRED:
8958 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8959 break;
8960
8961 default:
8962 /* unsupported! */
8963 WARN_ON_ONCE(1);
8964 status = -EINVAL;
8965 goto out_impl_id;
8966 }
8967 if (xprt) {
8968 task_setup_data.rpc_xprt = xprt;
8969 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8970 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8971 sizeof(calldata->args.verifier.data));
8972 }
8973 calldata->args.client = clp;
8974 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8975 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8976 #ifdef CONFIG_NFS_V4_1_MIGRATION
8977 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8978 #endif
8979 if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
8980 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8981 msg.rpc_argp = &calldata->args;
8982 msg.rpc_resp = &calldata->res;
8983 task_setup_data.callback_data = calldata;
8984
8985 return rpc_run_task(&task_setup_data);
8986
8987 out_impl_id:
8988 kfree(calldata->res.impl_id);
8989 out_server_scope:
8990 kfree(calldata->res.server_scope);
8991 out_server_owner:
8992 kfree(calldata->res.server_owner);
8993 out_calldata:
8994 kfree(calldata);
8995 out:
8996 nfs_put_client(clp);
8997 return ERR_PTR(status);
8998 }
8999
9000 /*
9001 * _nfs4_proc_exchange_id()
9002 *
9003 * Wrapper for EXCHANGE_ID operation.
9004 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)9005 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
9006 u32 sp4_how)
9007 {
9008 struct rpc_task *task;
9009 struct nfs41_exchange_id_args *argp;
9010 struct nfs41_exchange_id_res *resp;
9011 unsigned long now = jiffies;
9012 int status;
9013
9014 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
9015 if (IS_ERR(task))
9016 return PTR_ERR(task);
9017
9018 argp = task->tk_msg.rpc_argp;
9019 resp = task->tk_msg.rpc_resp;
9020 status = task->tk_status;
9021 if (status != 0)
9022 goto out;
9023
9024 status = nfs4_check_cl_exchange_flags(resp->flags,
9025 clp->cl_mvops->minor_version);
9026 if (status != 0)
9027 goto out;
9028
9029 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
9030 if (status != 0)
9031 goto out;
9032
9033 do_renew_lease(clp, now);
9034
9035 clp->cl_clientid = resp->clientid;
9036 clp->cl_exchange_flags = resp->flags;
9037 clp->cl_seqid = resp->seqid;
9038 /* Client ID is not confirmed */
9039 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
9040 clear_bit(NFS4_SESSION_ESTABLISHED,
9041 &clp->cl_session->session_state);
9042
9043 if (clp->cl_serverscope != NULL &&
9044 !nfs41_same_server_scope(clp->cl_serverscope,
9045 resp->server_scope)) {
9046 dprintk("%s: server_scope mismatch detected\n",
9047 __func__);
9048 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
9049 }
9050
9051 swap(clp->cl_serverowner, resp->server_owner);
9052 swap(clp->cl_serverscope, resp->server_scope);
9053 swap(clp->cl_implid, resp->impl_id);
9054
9055 /* Save the EXCHANGE_ID verifier session trunk tests */
9056 memcpy(clp->cl_confirm.data, argp->verifier.data,
9057 sizeof(clp->cl_confirm.data));
9058 out:
9059 trace_nfs4_exchange_id(clp, status);
9060 rpc_put_task(task);
9061 return status;
9062 }
9063
9064 /*
9065 * nfs4_proc_exchange_id()
9066 *
9067 * Returns zero, a negative errno, or a negative NFS4ERR status code.
9068 *
9069 * Since the clientid has expired, all compounds using sessions
9070 * associated with the stale clientid will be returning
9071 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
9072 * be in some phase of session reset.
9073 *
9074 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
9075 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)9076 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
9077 {
9078 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
9079 int status;
9080
9081 /* try SP4_MACH_CRED if krb5i/p */
9082 if (authflavor == RPC_AUTH_GSS_KRB5I ||
9083 authflavor == RPC_AUTH_GSS_KRB5P) {
9084 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
9085 if (!status)
9086 return 0;
9087 }
9088
9089 /* try SP4_NONE */
9090 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
9091 }
9092
9093 /**
9094 * nfs4_test_session_trunk
9095 *
9096 * This is an add_xprt_test() test function called from
9097 * rpc_clnt_setup_test_and_add_xprt.
9098 *
9099 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
9100 * and is dereferrenced in nfs4_exchange_id_release
9101 *
9102 * Upon success, add the new transport to the rpc_clnt
9103 *
9104 * @clnt: struct rpc_clnt to get new transport
9105 * @xprt: the rpc_xprt to test
9106 * @data: call data for _nfs4_proc_exchange_id.
9107 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)9108 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
9109 void *data)
9110 {
9111 struct nfs4_add_xprt_data *adata = data;
9112 struct rpc_task *task;
9113 int status;
9114
9115 u32 sp4_how;
9116
9117 dprintk("--> %s try %s\n", __func__,
9118 xprt->address_strings[RPC_DISPLAY_ADDR]);
9119
9120 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
9121
9122 try_again:
9123 /* Test connection for session trunking. Async exchange_id call */
9124 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
9125 if (IS_ERR(task))
9126 return;
9127
9128 status = task->tk_status;
9129 if (status == 0) {
9130 status = nfs4_detect_session_trunking(adata->clp,
9131 task->tk_msg.rpc_resp, xprt);
9132 trace_nfs4_trunked_exchange_id(adata->clp,
9133 xprt->address_strings[RPC_DISPLAY_ADDR], status);
9134 }
9135 if (status == 0)
9136 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
9137 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
9138 (struct sockaddr *)&xprt->addr))
9139 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
9140
9141 rpc_put_task(task);
9142 if (status == -NFS4ERR_DELAY) {
9143 ssleep(1);
9144 goto try_again;
9145 }
9146 }
9147 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
9148
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9149 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
9150 const struct cred *cred)
9151 {
9152 struct rpc_message msg = {
9153 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9154 .rpc_argp = clp,
9155 .rpc_cred = cred,
9156 };
9157 int status;
9158
9159 status = rpc_call_sync(clp->cl_rpcclient, &msg,
9160 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9161 trace_nfs4_destroy_clientid(clp, status);
9162 if (status)
9163 dprintk("NFS: Got error %d from the server %s on "
9164 "DESTROY_CLIENTID.", status, clp->cl_hostname);
9165 return status;
9166 }
9167
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9168 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9169 const struct cred *cred)
9170 {
9171 unsigned int loop;
9172 int ret;
9173
9174 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9175 ret = _nfs4_proc_destroy_clientid(clp, cred);
9176 switch (ret) {
9177 case -NFS4ERR_DELAY:
9178 case -NFS4ERR_CLIENTID_BUSY:
9179 ssleep(1);
9180 break;
9181 default:
9182 return ret;
9183 }
9184 }
9185 return 0;
9186 }
9187
nfs4_destroy_clientid(struct nfs_client * clp)9188 int nfs4_destroy_clientid(struct nfs_client *clp)
9189 {
9190 const struct cred *cred;
9191 int ret = 0;
9192
9193 if (clp->cl_mvops->minor_version < 1)
9194 goto out;
9195 if (clp->cl_exchange_flags == 0)
9196 goto out;
9197 if (clp->cl_preserve_clid)
9198 goto out;
9199 cred = nfs4_get_clid_cred(clp);
9200 ret = nfs4_proc_destroy_clientid(clp, cred);
9201 put_cred(cred);
9202 switch (ret) {
9203 case 0:
9204 case -NFS4ERR_STALE_CLIENTID:
9205 clp->cl_exchange_flags = 0;
9206 }
9207 out:
9208 return ret;
9209 }
9210
9211 #endif /* CONFIG_NFS_V4_1 */
9212
9213 struct nfs4_get_lease_time_data {
9214 struct nfs4_get_lease_time_args *args;
9215 struct nfs4_get_lease_time_res *res;
9216 struct nfs_client *clp;
9217 };
9218
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9219 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9220 void *calldata)
9221 {
9222 struct nfs4_get_lease_time_data *data =
9223 (struct nfs4_get_lease_time_data *)calldata;
9224
9225 /* just setup sequence, do not trigger session recovery
9226 since we're invoked within one */
9227 nfs4_setup_sequence(data->clp,
9228 &data->args->la_seq_args,
9229 &data->res->lr_seq_res,
9230 task);
9231 }
9232
9233 /*
9234 * Called from nfs4_state_manager thread for session setup, so don't recover
9235 * from sequence operation or clientid errors.
9236 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9237 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9238 {
9239 struct nfs4_get_lease_time_data *data =
9240 (struct nfs4_get_lease_time_data *)calldata;
9241
9242 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9243 return;
9244 switch (task->tk_status) {
9245 case -NFS4ERR_DELAY:
9246 case -NFS4ERR_GRACE:
9247 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9248 task->tk_status = 0;
9249 fallthrough;
9250 case -NFS4ERR_RETRY_UNCACHED_REP:
9251 rpc_restart_call_prepare(task);
9252 return;
9253 }
9254 }
9255
9256 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9257 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9258 .rpc_call_done = nfs4_get_lease_time_done,
9259 };
9260
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9261 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9262 {
9263 struct nfs4_get_lease_time_args args;
9264 struct nfs4_get_lease_time_res res = {
9265 .lr_fsinfo = fsinfo,
9266 };
9267 struct nfs4_get_lease_time_data data = {
9268 .args = &args,
9269 .res = &res,
9270 .clp = clp,
9271 };
9272 struct rpc_message msg = {
9273 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9274 .rpc_argp = &args,
9275 .rpc_resp = &res,
9276 };
9277 struct rpc_task_setup task_setup = {
9278 .rpc_client = clp->cl_rpcclient,
9279 .rpc_message = &msg,
9280 .callback_ops = &nfs4_get_lease_time_ops,
9281 .callback_data = &data,
9282 .flags = RPC_TASK_TIMEOUT,
9283 };
9284
9285 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9286 return nfs4_call_sync_custom(&task_setup);
9287 }
9288
9289 #ifdef CONFIG_NFS_V4_1
9290
9291 /*
9292 * Initialize the values to be used by the client in CREATE_SESSION
9293 * If nfs4_init_session set the fore channel request and response sizes,
9294 * use them.
9295 *
9296 * Set the back channel max_resp_sz_cached to zero to force the client to
9297 * always set csa_cachethis to FALSE because the current implementation
9298 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9299 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9300 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9301 struct rpc_clnt *clnt)
9302 {
9303 unsigned int max_rqst_sz, max_resp_sz;
9304 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9305 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9306
9307 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9308 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9309
9310 /* Fore channel attributes */
9311 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9312 args->fc_attrs.max_resp_sz = max_resp_sz;
9313 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9314 args->fc_attrs.max_reqs = max_session_slots;
9315
9316 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9317 "max_ops=%u max_reqs=%u\n",
9318 __func__,
9319 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9320 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9321
9322 /* Back channel attributes */
9323 args->bc_attrs.max_rqst_sz = max_bc_payload;
9324 args->bc_attrs.max_resp_sz = max_bc_payload;
9325 args->bc_attrs.max_resp_sz_cached = 0;
9326 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9327 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9328 if (args->bc_attrs.max_reqs > max_bc_slots)
9329 args->bc_attrs.max_reqs = max_bc_slots;
9330
9331 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9332 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9333 __func__,
9334 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9335 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9336 args->bc_attrs.max_reqs);
9337 }
9338
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9339 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9340 struct nfs41_create_session_res *res)
9341 {
9342 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9343 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9344
9345 if (rcvd->max_resp_sz > sent->max_resp_sz)
9346 return -EINVAL;
9347 /*
9348 * Our requested max_ops is the minimum we need; we're not
9349 * prepared to break up compounds into smaller pieces than that.
9350 * So, no point even trying to continue if the server won't
9351 * cooperate:
9352 */
9353 if (rcvd->max_ops < sent->max_ops)
9354 return -EINVAL;
9355 if (rcvd->max_reqs == 0)
9356 return -EINVAL;
9357 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9358 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9359 return 0;
9360 }
9361
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9362 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9363 struct nfs41_create_session_res *res)
9364 {
9365 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9366 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9367
9368 if (!(res->flags & SESSION4_BACK_CHAN))
9369 goto out;
9370 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9371 return -EINVAL;
9372 if (rcvd->max_resp_sz < sent->max_resp_sz)
9373 return -EINVAL;
9374 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9375 return -EINVAL;
9376 if (rcvd->max_ops > sent->max_ops)
9377 return -EINVAL;
9378 if (rcvd->max_reqs > sent->max_reqs)
9379 return -EINVAL;
9380 out:
9381 return 0;
9382 }
9383
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9384 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9385 struct nfs41_create_session_res *res)
9386 {
9387 int ret;
9388
9389 ret = nfs4_verify_fore_channel_attrs(args, res);
9390 if (ret)
9391 return ret;
9392 return nfs4_verify_back_channel_attrs(args, res);
9393 }
9394
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9395 static void nfs4_update_session(struct nfs4_session *session,
9396 struct nfs41_create_session_res *res)
9397 {
9398 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9399 /* Mark client id and session as being confirmed */
9400 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9401 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9402 session->flags = res->flags;
9403 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9404 if (res->flags & SESSION4_BACK_CHAN)
9405 memcpy(&session->bc_attrs, &res->bc_attrs,
9406 sizeof(session->bc_attrs));
9407 }
9408
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9409 static int _nfs4_proc_create_session(struct nfs_client *clp,
9410 const struct cred *cred)
9411 {
9412 struct nfs4_session *session = clp->cl_session;
9413 struct nfs41_create_session_args args = {
9414 .client = clp,
9415 .clientid = clp->cl_clientid,
9416 .seqid = clp->cl_seqid,
9417 .cb_program = NFS4_CALLBACK,
9418 };
9419 struct nfs41_create_session_res res;
9420
9421 struct rpc_message msg = {
9422 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9423 .rpc_argp = &args,
9424 .rpc_resp = &res,
9425 .rpc_cred = cred,
9426 };
9427 int status;
9428
9429 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9430 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9431
9432 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9433 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9434 trace_nfs4_create_session(clp, status);
9435
9436 switch (status) {
9437 case -NFS4ERR_STALE_CLIENTID:
9438 case -NFS4ERR_DELAY:
9439 case -ETIMEDOUT:
9440 case -EACCES:
9441 case -EAGAIN:
9442 goto out;
9443 }
9444
9445 clp->cl_seqid++;
9446 if (!status) {
9447 /* Verify the session's negotiated channel_attrs values */
9448 status = nfs4_verify_channel_attrs(&args, &res);
9449 /* Increment the clientid slot sequence id */
9450 if (status)
9451 goto out;
9452 nfs4_update_session(session, &res);
9453 }
9454 out:
9455 return status;
9456 }
9457
9458 /*
9459 * Issues a CREATE_SESSION operation to the server.
9460 * It is the responsibility of the caller to verify the session is
9461 * expired before calling this routine.
9462 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9463 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9464 {
9465 int status;
9466 unsigned *ptr;
9467 struct nfs4_session *session = clp->cl_session;
9468 struct nfs4_add_xprt_data xprtdata = {
9469 .clp = clp,
9470 };
9471 struct rpc_add_xprt_test rpcdata = {
9472 .add_xprt_test = clp->cl_mvops->session_trunk,
9473 .data = &xprtdata,
9474 };
9475
9476 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9477
9478 status = _nfs4_proc_create_session(clp, cred);
9479 if (status)
9480 goto out;
9481
9482 /* Init or reset the session slot tables */
9483 status = nfs4_setup_session_slot_tables(session);
9484 dprintk("slot table setup returned %d\n", status);
9485 if (status)
9486 goto out;
9487
9488 ptr = (unsigned *)&session->sess_id.data[0];
9489 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9490 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9491 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9492 out:
9493 return status;
9494 }
9495
9496 /*
9497 * Issue the over-the-wire RPC DESTROY_SESSION.
9498 * The caller must serialize access to this routine.
9499 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9500 int nfs4_proc_destroy_session(struct nfs4_session *session,
9501 const struct cred *cred)
9502 {
9503 struct rpc_message msg = {
9504 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9505 .rpc_argp = session,
9506 .rpc_cred = cred,
9507 };
9508 int status = 0;
9509
9510 /* session is still being setup */
9511 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9512 return 0;
9513
9514 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9515 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9516 trace_nfs4_destroy_session(session->clp, status);
9517
9518 if (status)
9519 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9520 "Session has been destroyed regardless...\n", status);
9521 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9522 return status;
9523 }
9524
9525 /*
9526 * Renew the cl_session lease.
9527 */
9528 struct nfs4_sequence_data {
9529 struct nfs_client *clp;
9530 struct nfs4_sequence_args args;
9531 struct nfs4_sequence_res res;
9532 };
9533
nfs41_sequence_release(void * data)9534 static void nfs41_sequence_release(void *data)
9535 {
9536 struct nfs4_sequence_data *calldata = data;
9537 struct nfs_client *clp = calldata->clp;
9538
9539 if (refcount_read(&clp->cl_count) > 1)
9540 nfs4_schedule_state_renewal(clp);
9541 nfs_put_client(clp);
9542 kfree(calldata);
9543 }
9544
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9545 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9546 {
9547 switch(task->tk_status) {
9548 case -NFS4ERR_DELAY:
9549 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9550 return -EAGAIN;
9551 default:
9552 nfs4_schedule_lease_recovery(clp);
9553 }
9554 return 0;
9555 }
9556
nfs41_sequence_call_done(struct rpc_task * task,void * data)9557 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9558 {
9559 struct nfs4_sequence_data *calldata = data;
9560 struct nfs_client *clp = calldata->clp;
9561
9562 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9563 return;
9564
9565 trace_nfs4_sequence(clp, task->tk_status);
9566 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9567 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9568 if (refcount_read(&clp->cl_count) == 1)
9569 return;
9570
9571 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9572 rpc_restart_call_prepare(task);
9573 return;
9574 }
9575 }
9576 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9577 }
9578
nfs41_sequence_prepare(struct rpc_task * task,void * data)9579 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9580 {
9581 struct nfs4_sequence_data *calldata = data;
9582 struct nfs_client *clp = calldata->clp;
9583 struct nfs4_sequence_args *args;
9584 struct nfs4_sequence_res *res;
9585
9586 args = task->tk_msg.rpc_argp;
9587 res = task->tk_msg.rpc_resp;
9588
9589 nfs4_setup_sequence(clp, args, res, task);
9590 }
9591
9592 static const struct rpc_call_ops nfs41_sequence_ops = {
9593 .rpc_call_done = nfs41_sequence_call_done,
9594 .rpc_call_prepare = nfs41_sequence_prepare,
9595 .rpc_release = nfs41_sequence_release,
9596 };
9597
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9598 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9599 const struct cred *cred,
9600 struct nfs4_slot *slot,
9601 bool is_privileged)
9602 {
9603 struct nfs4_sequence_data *calldata;
9604 struct rpc_message msg = {
9605 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9606 .rpc_cred = cred,
9607 };
9608 struct rpc_task_setup task_setup_data = {
9609 .rpc_client = clp->cl_rpcclient,
9610 .rpc_message = &msg,
9611 .callback_ops = &nfs41_sequence_ops,
9612 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9613 };
9614 struct rpc_task *ret;
9615
9616 ret = ERR_PTR(-EIO);
9617 if (!refcount_inc_not_zero(&clp->cl_count))
9618 goto out_err;
9619
9620 ret = ERR_PTR(-ENOMEM);
9621 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9622 if (calldata == NULL)
9623 goto out_put_clp;
9624 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9625 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9626 msg.rpc_argp = &calldata->args;
9627 msg.rpc_resp = &calldata->res;
9628 calldata->clp = clp;
9629 task_setup_data.callback_data = calldata;
9630
9631 ret = rpc_run_task(&task_setup_data);
9632 if (IS_ERR(ret))
9633 goto out_err;
9634 return ret;
9635 out_put_clp:
9636 nfs_put_client(clp);
9637 out_err:
9638 nfs41_release_slot(slot);
9639 return ret;
9640 }
9641
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9642 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9643 {
9644 struct rpc_task *task;
9645 int ret = 0;
9646
9647 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9648 return -EAGAIN;
9649 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9650 if (IS_ERR(task))
9651 ret = PTR_ERR(task);
9652 else
9653 rpc_put_task_async(task);
9654 dprintk("<-- %s status=%d\n", __func__, ret);
9655 return ret;
9656 }
9657
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9658 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9659 {
9660 struct rpc_task *task;
9661 int ret;
9662
9663 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9664 if (IS_ERR(task)) {
9665 ret = PTR_ERR(task);
9666 goto out;
9667 }
9668 ret = rpc_wait_for_completion_task(task);
9669 if (!ret)
9670 ret = task->tk_status;
9671 rpc_put_task(task);
9672 out:
9673 dprintk("<-- %s status=%d\n", __func__, ret);
9674 return ret;
9675 }
9676
9677 struct nfs4_reclaim_complete_data {
9678 struct nfs_client *clp;
9679 struct nfs41_reclaim_complete_args arg;
9680 struct nfs41_reclaim_complete_res res;
9681 };
9682
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9683 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9684 {
9685 struct nfs4_reclaim_complete_data *calldata = data;
9686
9687 nfs4_setup_sequence(calldata->clp,
9688 &calldata->arg.seq_args,
9689 &calldata->res.seq_res,
9690 task);
9691 }
9692
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9693 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9694 {
9695 switch(task->tk_status) {
9696 case 0:
9697 wake_up_all(&clp->cl_lock_waitq);
9698 fallthrough;
9699 case -NFS4ERR_COMPLETE_ALREADY:
9700 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9701 break;
9702 case -NFS4ERR_DELAY:
9703 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9704 fallthrough;
9705 case -NFS4ERR_RETRY_UNCACHED_REP:
9706 case -EACCES:
9707 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9708 __func__, task->tk_status, clp->cl_hostname);
9709 return -EAGAIN;
9710 case -NFS4ERR_BADSESSION:
9711 case -NFS4ERR_DEADSESSION:
9712 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9713 break;
9714 default:
9715 nfs4_schedule_lease_recovery(clp);
9716 }
9717 return 0;
9718 }
9719
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9720 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9721 {
9722 struct nfs4_reclaim_complete_data *calldata = data;
9723 struct nfs_client *clp = calldata->clp;
9724 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9725
9726 if (!nfs41_sequence_done(task, res))
9727 return;
9728
9729 trace_nfs4_reclaim_complete(clp, task->tk_status);
9730 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9731 rpc_restart_call_prepare(task);
9732 return;
9733 }
9734 }
9735
nfs4_free_reclaim_complete_data(void * data)9736 static void nfs4_free_reclaim_complete_data(void *data)
9737 {
9738 struct nfs4_reclaim_complete_data *calldata = data;
9739
9740 kfree(calldata);
9741 }
9742
9743 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9744 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9745 .rpc_call_done = nfs4_reclaim_complete_done,
9746 .rpc_release = nfs4_free_reclaim_complete_data,
9747 };
9748
9749 /*
9750 * Issue a global reclaim complete.
9751 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9752 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9753 const struct cred *cred)
9754 {
9755 struct nfs4_reclaim_complete_data *calldata;
9756 struct rpc_message msg = {
9757 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9758 .rpc_cred = cred,
9759 };
9760 struct rpc_task_setup task_setup_data = {
9761 .rpc_client = clp->cl_rpcclient,
9762 .rpc_message = &msg,
9763 .callback_ops = &nfs4_reclaim_complete_call_ops,
9764 .flags = RPC_TASK_NO_ROUND_ROBIN,
9765 };
9766 int status = -ENOMEM;
9767
9768 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9769 if (calldata == NULL)
9770 goto out;
9771 calldata->clp = clp;
9772 calldata->arg.one_fs = 0;
9773
9774 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9775 msg.rpc_argp = &calldata->arg;
9776 msg.rpc_resp = &calldata->res;
9777 task_setup_data.callback_data = calldata;
9778 status = nfs4_call_sync_custom(&task_setup_data);
9779 out:
9780 dprintk("<-- %s status=%d\n", __func__, status);
9781 return status;
9782 }
9783
9784 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9785 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9786 {
9787 struct nfs4_layoutget *lgp = calldata;
9788 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9789
9790 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9791 &lgp->res.seq_res, task);
9792 }
9793
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9794 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9795 {
9796 struct nfs4_layoutget *lgp = calldata;
9797
9798 nfs41_sequence_process(task, &lgp->res.seq_res);
9799 }
9800
9801 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9802 nfs4_layoutget_handle_exception(struct rpc_task *task,
9803 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9804 {
9805 struct inode *inode = lgp->args.inode;
9806 struct nfs_server *server = NFS_SERVER(inode);
9807 struct pnfs_layout_hdr *lo = lgp->lo;
9808 int nfs4err = task->tk_status;
9809 int err, status = 0;
9810 LIST_HEAD(head);
9811
9812 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9813
9814 nfs4_sequence_free_slot(&lgp->res.seq_res);
9815
9816 exception->state = NULL;
9817 exception->stateid = NULL;
9818
9819 switch (nfs4err) {
9820 case 0:
9821 goto out;
9822
9823 /*
9824 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9825 * on the file. set tk_status to -ENODATA to tell upper layer to
9826 * retry go inband.
9827 */
9828 case -NFS4ERR_LAYOUTUNAVAILABLE:
9829 status = -ENODATA;
9830 goto out;
9831 /*
9832 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9833 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9834 */
9835 case -NFS4ERR_BADLAYOUT:
9836 status = -EOVERFLOW;
9837 goto out;
9838 /*
9839 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9840 * (or clients) writing to the same RAID stripe except when
9841 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9842 *
9843 * Treat it like we would RECALLCONFLICT -- we retry for a little
9844 * while, and then eventually give up.
9845 */
9846 case -NFS4ERR_LAYOUTTRYLATER:
9847 if (lgp->args.minlength == 0) {
9848 status = -EOVERFLOW;
9849 goto out;
9850 }
9851 status = -EBUSY;
9852 break;
9853 case -NFS4ERR_RECALLCONFLICT:
9854 case -NFS4ERR_RETURNCONFLICT:
9855 status = -ERECALLCONFLICT;
9856 break;
9857 case -NFS4ERR_DELEG_REVOKED:
9858 case -NFS4ERR_ADMIN_REVOKED:
9859 case -NFS4ERR_EXPIRED:
9860 case -NFS4ERR_BAD_STATEID:
9861 exception->timeout = 0;
9862 spin_lock(&inode->i_lock);
9863 /* If the open stateid was bad, then recover it. */
9864 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9865 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9866 spin_unlock(&inode->i_lock);
9867 exception->state = lgp->args.ctx->state;
9868 exception->stateid = &lgp->args.stateid;
9869 break;
9870 }
9871
9872 /*
9873 * Mark the bad layout state as invalid, then retry
9874 */
9875 pnfs_mark_layout_stateid_invalid(lo, &head);
9876 spin_unlock(&inode->i_lock);
9877 nfs_commit_inode(inode, 0);
9878 pnfs_free_lseg_list(&head);
9879 status = -EAGAIN;
9880 goto out;
9881 }
9882
9883 err = nfs4_handle_exception(server, nfs4err, exception);
9884 if (!status) {
9885 if (exception->retry)
9886 status = -EAGAIN;
9887 else
9888 status = err;
9889 }
9890 out:
9891 return status;
9892 }
9893
max_response_pages(struct nfs_server * server)9894 size_t max_response_pages(struct nfs_server *server)
9895 {
9896 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9897 return nfs_page_array_len(0, max_resp_sz);
9898 }
9899
nfs4_layoutget_release(void * calldata)9900 static void nfs4_layoutget_release(void *calldata)
9901 {
9902 struct nfs4_layoutget *lgp = calldata;
9903
9904 nfs4_sequence_free_slot(&lgp->res.seq_res);
9905 pnfs_layoutget_free(lgp);
9906 }
9907
9908 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9909 .rpc_call_prepare = nfs4_layoutget_prepare,
9910 .rpc_call_done = nfs4_layoutget_done,
9911 .rpc_release = nfs4_layoutget_release,
9912 };
9913
9914 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9915 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9916 struct nfs4_exception *exception)
9917 {
9918 struct inode *inode = lgp->args.inode;
9919 struct nfs_server *server = NFS_SERVER(inode);
9920 struct rpc_task *task;
9921 struct rpc_message msg = {
9922 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9923 .rpc_argp = &lgp->args,
9924 .rpc_resp = &lgp->res,
9925 .rpc_cred = lgp->cred,
9926 };
9927 struct rpc_task_setup task_setup_data = {
9928 .rpc_client = server->client,
9929 .rpc_message = &msg,
9930 .callback_ops = &nfs4_layoutget_call_ops,
9931 .callback_data = lgp,
9932 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9933 RPC_TASK_MOVEABLE,
9934 };
9935 struct pnfs_layout_segment *lseg = NULL;
9936 int status = 0;
9937
9938 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9939 exception->retry = 0;
9940
9941 task = rpc_run_task(&task_setup_data);
9942 if (IS_ERR(task))
9943 return ERR_CAST(task);
9944
9945 status = rpc_wait_for_completion_task(task);
9946 if (status != 0)
9947 goto out;
9948
9949 if (task->tk_status < 0) {
9950 exception->retry = 1;
9951 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9952 } else if (lgp->res.layoutp->len == 0) {
9953 exception->retry = 1;
9954 status = -EAGAIN;
9955 nfs4_update_delay(&exception->timeout);
9956 } else
9957 lseg = pnfs_layout_process(lgp);
9958 out:
9959 trace_nfs4_layoutget(lgp->args.ctx,
9960 &lgp->args.range,
9961 &lgp->res.range,
9962 &lgp->res.stateid,
9963 status);
9964
9965 rpc_put_task(task);
9966 dprintk("<-- %s status=%d\n", __func__, status);
9967 if (status)
9968 return ERR_PTR(status);
9969 return lseg;
9970 }
9971
9972 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9973 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9974 {
9975 struct nfs4_layoutreturn *lrp = calldata;
9976
9977 nfs4_setup_sequence(lrp->clp,
9978 &lrp->args.seq_args,
9979 &lrp->res.seq_res,
9980 task);
9981 if (!pnfs_layout_is_valid(lrp->args.layout))
9982 rpc_exit(task, 0);
9983 }
9984
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9985 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9986 {
9987 struct nfs4_layoutreturn *lrp = calldata;
9988 struct nfs_server *server;
9989
9990 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9991 return;
9992
9993 if (task->tk_rpc_status == -ETIMEDOUT) {
9994 lrp->rpc_status = -EAGAIN;
9995 lrp->res.lrs_present = 0;
9996 return;
9997 }
9998 /*
9999 * Was there an RPC level error? Assume the call succeeded,
10000 * and that we need to release the layout
10001 */
10002 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
10003 lrp->res.lrs_present = 0;
10004 return;
10005 }
10006
10007 server = NFS_SERVER(lrp->args.inode);
10008 switch (task->tk_status) {
10009 case -NFS4ERR_OLD_STATEID:
10010 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
10011 &lrp->args.range,
10012 lrp->args.inode))
10013 goto out_restart;
10014 fallthrough;
10015 default:
10016 task->tk_status = 0;
10017 lrp->res.lrs_present = 0;
10018 fallthrough;
10019 case 0:
10020 break;
10021 case -NFS4ERR_BADSESSION:
10022 case -NFS4ERR_DEADSESSION:
10023 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10024 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
10025 task->tk_status);
10026 lrp->res.lrs_present = 0;
10027 lrp->rpc_status = -EAGAIN;
10028 task->tk_status = 0;
10029 break;
10030 case -NFS4ERR_DELAY:
10031 if (nfs4_async_handle_error(task, server, NULL, NULL) ==
10032 -EAGAIN)
10033 goto out_restart;
10034 lrp->res.lrs_present = 0;
10035 break;
10036 }
10037 return;
10038 out_restart:
10039 task->tk_status = 0;
10040 nfs4_sequence_free_slot(&lrp->res.seq_res);
10041 rpc_restart_call_prepare(task);
10042 }
10043
nfs4_layoutreturn_release(void * calldata)10044 static void nfs4_layoutreturn_release(void *calldata)
10045 {
10046 struct nfs4_layoutreturn *lrp = calldata;
10047 struct pnfs_layout_hdr *lo = lrp->args.layout;
10048
10049 if (lrp->rpc_status == 0 || !lrp->inode)
10050 pnfs_layoutreturn_free_lsegs(
10051 lo, &lrp->args.stateid, &lrp->args.range,
10052 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
10053 else
10054 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
10055 &lrp->args.range);
10056 nfs4_sequence_free_slot(&lrp->res.seq_res);
10057 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
10058 lrp->ld_private.ops->free(&lrp->ld_private);
10059 pnfs_put_layout_hdr(lrp->args.layout);
10060 nfs_iput_and_deactive(lrp->inode);
10061 put_cred(lrp->cred);
10062 kfree(calldata);
10063 }
10064
10065 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
10066 .rpc_call_prepare = nfs4_layoutreturn_prepare,
10067 .rpc_call_done = nfs4_layoutreturn_done,
10068 .rpc_release = nfs4_layoutreturn_release,
10069 };
10070
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,unsigned int flags)10071 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
10072 {
10073 struct rpc_task *task;
10074 struct rpc_message msg = {
10075 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
10076 .rpc_argp = &lrp->args,
10077 .rpc_resp = &lrp->res,
10078 .rpc_cred = lrp->cred,
10079 };
10080 struct rpc_task_setup task_setup_data = {
10081 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
10082 .rpc_message = &msg,
10083 .callback_ops = &nfs4_layoutreturn_call_ops,
10084 .callback_data = lrp,
10085 .flags = RPC_TASK_MOVEABLE,
10086 };
10087 int status = 0;
10088
10089 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
10090 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
10091 &task_setup_data.rpc_client, &msg);
10092
10093 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
10094 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
10095 if (!lrp->inode) {
10096 nfs4_layoutreturn_release(lrp);
10097 return -EAGAIN;
10098 }
10099 task_setup_data.flags |= RPC_TASK_ASYNC;
10100 }
10101 if (!lrp->inode)
10102 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
10103 if (flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED)
10104 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10105 1);
10106 else
10107 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10108 0);
10109 task = rpc_run_task(&task_setup_data);
10110 if (IS_ERR(task))
10111 return PTR_ERR(task);
10112 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
10113 status = task->tk_status;
10114 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
10115 dprintk("<-- %s status=%d\n", __func__, status);
10116 rpc_put_task(task);
10117 return status;
10118 }
10119
10120 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10121 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
10122 struct pnfs_device *pdev,
10123 const struct cred *cred)
10124 {
10125 struct nfs4_getdeviceinfo_args args = {
10126 .pdev = pdev,
10127 .notify_types = NOTIFY_DEVICEID4_CHANGE |
10128 NOTIFY_DEVICEID4_DELETE,
10129 };
10130 struct nfs4_getdeviceinfo_res res = {
10131 .pdev = pdev,
10132 };
10133 struct rpc_message msg = {
10134 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
10135 .rpc_argp = &args,
10136 .rpc_resp = &res,
10137 .rpc_cred = cred,
10138 };
10139 int status;
10140
10141 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
10142 if (res.notification & ~args.notify_types)
10143 dprintk("%s: unsupported notification\n", __func__);
10144 if (res.notification != args.notify_types)
10145 pdev->nocache = 1;
10146
10147 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
10148
10149 dprintk("<-- %s status=%d\n", __func__, status);
10150
10151 return status;
10152 }
10153
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10154 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
10155 struct pnfs_device *pdev,
10156 const struct cred *cred)
10157 {
10158 struct nfs4_exception exception = { };
10159 int err;
10160
10161 do {
10162 err = nfs4_handle_exception(server,
10163 _nfs4_proc_getdeviceinfo(server, pdev, cred),
10164 &exception);
10165 } while (exception.retry);
10166 return err;
10167 }
10168 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10169
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)10170 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10171 {
10172 struct nfs4_layoutcommit_data *data = calldata;
10173 struct nfs_server *server = NFS_SERVER(data->args.inode);
10174
10175 nfs4_setup_sequence(server->nfs_client,
10176 &data->args.seq_args,
10177 &data->res.seq_res,
10178 task);
10179 }
10180
10181 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)10182 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10183 {
10184 struct nfs4_layoutcommit_data *data = calldata;
10185 struct nfs_server *server = NFS_SERVER(data->args.inode);
10186
10187 if (!nfs41_sequence_done(task, &data->res.seq_res))
10188 return;
10189
10190 switch (task->tk_status) { /* Just ignore these failures */
10191 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10192 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
10193 case -NFS4ERR_BADLAYOUT: /* no layout */
10194 case -NFS4ERR_GRACE: /* loca_recalim always false */
10195 task->tk_status = 0;
10196 break;
10197 case 0:
10198 break;
10199 default:
10200 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10201 rpc_restart_call_prepare(task);
10202 return;
10203 }
10204 }
10205 }
10206
nfs4_layoutcommit_release(void * calldata)10207 static void nfs4_layoutcommit_release(void *calldata)
10208 {
10209 struct nfs4_layoutcommit_data *data = calldata;
10210
10211 pnfs_cleanup_layoutcommit(data);
10212 nfs_post_op_update_inode_force_wcc(data->args.inode,
10213 data->res.fattr);
10214 put_cred(data->cred);
10215 nfs_iput_and_deactive(data->inode);
10216 kfree(data);
10217 }
10218
10219 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10220 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10221 .rpc_call_done = nfs4_layoutcommit_done,
10222 .rpc_release = nfs4_layoutcommit_release,
10223 };
10224
10225 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10226 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10227 {
10228 struct rpc_message msg = {
10229 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10230 .rpc_argp = &data->args,
10231 .rpc_resp = &data->res,
10232 .rpc_cred = data->cred,
10233 };
10234 struct rpc_task_setup task_setup_data = {
10235 .task = &data->task,
10236 .rpc_client = NFS_CLIENT(data->args.inode),
10237 .rpc_message = &msg,
10238 .callback_ops = &nfs4_layoutcommit_ops,
10239 .callback_data = data,
10240 .flags = RPC_TASK_MOVEABLE,
10241 };
10242 struct rpc_task *task;
10243 int status = 0;
10244
10245 dprintk("NFS: initiating layoutcommit call. sync %d "
10246 "lbw: %llu inode %lu\n", sync,
10247 data->args.lastbytewritten,
10248 data->args.inode->i_ino);
10249
10250 if (!sync) {
10251 data->inode = nfs_igrab_and_active(data->args.inode);
10252 if (data->inode == NULL) {
10253 nfs4_layoutcommit_release(data);
10254 return -EAGAIN;
10255 }
10256 task_setup_data.flags = RPC_TASK_ASYNC;
10257 }
10258 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10259 task = rpc_run_task(&task_setup_data);
10260 if (IS_ERR(task))
10261 return PTR_ERR(task);
10262 if (sync)
10263 status = task->tk_status;
10264 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10265 dprintk("%s: status %d\n", __func__, status);
10266 rpc_put_task(task);
10267 return status;
10268 }
10269
10270 /*
10271 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10272 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10273 */
10274 static int
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10275 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10276 struct nfs_fsinfo *info,
10277 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10278 {
10279 struct nfs41_secinfo_no_name_args args = {
10280 .style = SECINFO_STYLE_CURRENT_FH,
10281 };
10282 struct nfs4_secinfo_res res = {
10283 .flavors = flavors,
10284 };
10285 struct rpc_message msg = {
10286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10287 .rpc_argp = &args,
10288 .rpc_resp = &res,
10289 };
10290 struct nfs4_call_sync_data data = {
10291 .seq_server = server,
10292 .seq_args = &args.seq_args,
10293 .seq_res = &res.seq_res,
10294 };
10295 struct rpc_task_setup task_setup = {
10296 .rpc_client = server->client,
10297 .rpc_message = &msg,
10298 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10299 .callback_data = &data,
10300 .flags = RPC_TASK_NO_ROUND_ROBIN,
10301 };
10302 const struct cred *cred = NULL;
10303 int status;
10304
10305 if (use_integrity) {
10306 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10307
10308 cred = nfs4_get_clid_cred(server->nfs_client);
10309 msg.rpc_cred = cred;
10310 }
10311
10312 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10313 status = nfs4_call_sync_custom(&task_setup);
10314 dprintk("<-- %s status=%d\n", __func__, status);
10315
10316 put_cred(cred);
10317
10318 return status;
10319 }
10320
10321 static int
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors)10322 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10323 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10324 {
10325 struct nfs4_exception exception = {
10326 .interruptible = true,
10327 };
10328 int err;
10329 do {
10330 /* first try using integrity protection */
10331 err = -NFS4ERR_WRONGSEC;
10332
10333 /* try to use integrity protection with machine cred */
10334 if (_nfs4_is_integrity_protected(server->nfs_client))
10335 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10336 flavors, true);
10337
10338 /*
10339 * if unable to use integrity protection, or SECINFO with
10340 * integrity protection returns NFS4ERR_WRONGSEC (which is
10341 * disallowed by spec, but exists in deployed servers) use
10342 * the current filesystem's rpc_client and the user cred.
10343 */
10344 if (err == -NFS4ERR_WRONGSEC)
10345 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10346 flavors, false);
10347
10348 switch (err) {
10349 case 0:
10350 case -NFS4ERR_WRONGSEC:
10351 case -ENOTSUPP:
10352 goto out;
10353 default:
10354 err = nfs4_handle_exception(server, err, &exception);
10355 }
10356 } while (exception.retry);
10357 out:
10358 return err;
10359 }
10360
10361 static int
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)10362 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10363 struct nfs_fsinfo *info)
10364 {
10365 int err;
10366 struct page *page;
10367 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10368 struct nfs4_secinfo_flavors *flavors;
10369 struct nfs4_secinfo4 *secinfo;
10370 int i;
10371
10372 page = alloc_page(GFP_KERNEL);
10373 if (!page) {
10374 err = -ENOMEM;
10375 goto out;
10376 }
10377
10378 flavors = page_address(page);
10379 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10380
10381 /*
10382 * Fall back on "guess and check" method if
10383 * the server doesn't support SECINFO_NO_NAME
10384 */
10385 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10386 err = nfs4_find_root_sec(server, fhandle, info);
10387 goto out_freepage;
10388 }
10389 if (err)
10390 goto out_freepage;
10391
10392 for (i = 0; i < flavors->num_flavors; i++) {
10393 secinfo = &flavors->flavors[i];
10394
10395 switch (secinfo->flavor) {
10396 case RPC_AUTH_NULL:
10397 case RPC_AUTH_UNIX:
10398 case RPC_AUTH_GSS:
10399 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10400 &secinfo->flavor_info);
10401 break;
10402 default:
10403 flavor = RPC_AUTH_MAXFLAVOR;
10404 break;
10405 }
10406
10407 if (!nfs_auth_info_match(&server->auth_info, flavor))
10408 flavor = RPC_AUTH_MAXFLAVOR;
10409
10410 if (flavor != RPC_AUTH_MAXFLAVOR) {
10411 err = nfs4_lookup_root_sec(server, fhandle,
10412 info, flavor);
10413 if (!err)
10414 break;
10415 }
10416 }
10417
10418 if (flavor == RPC_AUTH_MAXFLAVOR)
10419 err = -EPERM;
10420
10421 out_freepage:
10422 put_page(page);
10423 if (err == -EACCES)
10424 return -EPERM;
10425 out:
10426 return err;
10427 }
10428
_nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10429 static int _nfs41_test_stateid(struct nfs_server *server,
10430 const nfs4_stateid *stateid,
10431 const struct cred *cred)
10432 {
10433 int status;
10434 struct nfs41_test_stateid_args args = {
10435 .stateid = *stateid,
10436 };
10437 struct nfs41_test_stateid_res res;
10438 struct rpc_message msg = {
10439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10440 .rpc_argp = &args,
10441 .rpc_resp = &res,
10442 .rpc_cred = cred,
10443 };
10444 struct rpc_clnt *rpc_client = server->client;
10445
10446 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10447 &rpc_client, &msg);
10448
10449 dprintk("NFS call test_stateid %p\n", stateid);
10450 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10451 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10452 &args.seq_args, &res.seq_res);
10453 if (status != NFS_OK) {
10454 dprintk("NFS reply test_stateid: failed, %d\n", status);
10455 return status;
10456 }
10457 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10458 return -res.status;
10459 }
10460
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10461 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10462 int err, struct nfs4_exception *exception)
10463 {
10464 exception->retry = 0;
10465 switch(err) {
10466 case -NFS4ERR_DELAY:
10467 case -NFS4ERR_RETRY_UNCACHED_REP:
10468 nfs4_handle_exception(server, err, exception);
10469 break;
10470 case -NFS4ERR_BADSESSION:
10471 case -NFS4ERR_BADSLOT:
10472 case -NFS4ERR_BAD_HIGH_SLOT:
10473 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10474 case -NFS4ERR_DEADSESSION:
10475 nfs4_do_handle_exception(server, err, exception);
10476 }
10477 }
10478
10479 /**
10480 * nfs41_test_stateid - perform a TEST_STATEID operation
10481 *
10482 * @server: server / transport on which to perform the operation
10483 * @stateid: state ID to test
10484 * @cred: credential
10485 *
10486 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10487 * Otherwise a negative NFS4ERR value is returned if the operation
10488 * failed or the state ID is not currently valid.
10489 */
nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10490 static int nfs41_test_stateid(struct nfs_server *server,
10491 const nfs4_stateid *stateid,
10492 const struct cred *cred)
10493 {
10494 struct nfs4_exception exception = {
10495 .interruptible = true,
10496 };
10497 int err;
10498 do {
10499 err = _nfs41_test_stateid(server, stateid, cred);
10500 nfs4_handle_delay_or_session_error(server, err, &exception);
10501 } while (exception.retry);
10502 return err;
10503 }
10504
10505 struct nfs_free_stateid_data {
10506 struct nfs_server *server;
10507 struct nfs41_free_stateid_args args;
10508 struct nfs41_free_stateid_res res;
10509 };
10510
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10511 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10512 {
10513 struct nfs_free_stateid_data *data = calldata;
10514 nfs4_setup_sequence(data->server->nfs_client,
10515 &data->args.seq_args,
10516 &data->res.seq_res,
10517 task);
10518 }
10519
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10520 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10521 {
10522 struct nfs_free_stateid_data *data = calldata;
10523
10524 nfs41_sequence_done(task, &data->res.seq_res);
10525
10526 switch (task->tk_status) {
10527 case -NFS4ERR_DELAY:
10528 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10529 rpc_restart_call_prepare(task);
10530 }
10531 }
10532
nfs41_free_stateid_release(void * calldata)10533 static void nfs41_free_stateid_release(void *calldata)
10534 {
10535 struct nfs_free_stateid_data *data = calldata;
10536 struct nfs_client *clp = data->server->nfs_client;
10537
10538 nfs_put_client(clp);
10539 kfree(calldata);
10540 }
10541
10542 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10543 .rpc_call_prepare = nfs41_free_stateid_prepare,
10544 .rpc_call_done = nfs41_free_stateid_done,
10545 .rpc_release = nfs41_free_stateid_release,
10546 };
10547
10548 /**
10549 * nfs41_free_stateid - perform a FREE_STATEID operation
10550 *
10551 * @server: server / transport on which to perform the operation
10552 * @stateid: state ID to release
10553 * @cred: credential
10554 * @privileged: set to true if this call needs to be privileged
10555 *
10556 * Note: this function is always asynchronous.
10557 */
nfs41_free_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred,bool privileged)10558 static int nfs41_free_stateid(struct nfs_server *server,
10559 const nfs4_stateid *stateid,
10560 const struct cred *cred,
10561 bool privileged)
10562 {
10563 struct rpc_message msg = {
10564 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10565 .rpc_cred = cred,
10566 };
10567 struct rpc_task_setup task_setup = {
10568 .rpc_client = server->client,
10569 .rpc_message = &msg,
10570 .callback_ops = &nfs41_free_stateid_ops,
10571 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10572 };
10573 struct nfs_free_stateid_data *data;
10574 struct rpc_task *task;
10575 struct nfs_client *clp = server->nfs_client;
10576
10577 if (!refcount_inc_not_zero(&clp->cl_count))
10578 return -EIO;
10579
10580 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10581 &task_setup.rpc_client, &msg);
10582
10583 dprintk("NFS call free_stateid %p\n", stateid);
10584 data = kmalloc(sizeof(*data), GFP_KERNEL);
10585 if (!data)
10586 return -ENOMEM;
10587 data->server = server;
10588 nfs4_stateid_copy(&data->args.stateid, stateid);
10589
10590 task_setup.callback_data = data;
10591
10592 msg.rpc_argp = &data->args;
10593 msg.rpc_resp = &data->res;
10594 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10595 task = rpc_run_task(&task_setup);
10596 if (IS_ERR(task))
10597 return PTR_ERR(task);
10598 rpc_put_task(task);
10599 return 0;
10600 }
10601
10602 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10603 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10604 {
10605 const struct cred *cred = lsp->ls_state->owner->so_cred;
10606
10607 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10608 nfs4_free_lock_state(server, lsp);
10609 }
10610
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10611 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10612 const nfs4_stateid *s2)
10613 {
10614 if (s1->type != s2->type)
10615 return false;
10616
10617 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10618 return false;
10619
10620 if (s1->seqid == s2->seqid)
10621 return true;
10622
10623 return s1->seqid == 0 || s2->seqid == 0;
10624 }
10625
10626 #endif /* CONFIG_NFS_V4_1 */
10627
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10628 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10629 const nfs4_stateid *s2)
10630 {
10631 return nfs4_stateid_match(s1, s2);
10632 }
10633
10634
10635 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10636 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10637 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10638 .recover_open = nfs4_open_reclaim,
10639 .recover_lock = nfs4_lock_reclaim,
10640 .establish_clid = nfs4_init_clientid,
10641 .detect_trunking = nfs40_discover_server_trunking,
10642 };
10643
10644 #if defined(CONFIG_NFS_V4_1)
10645 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10646 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10647 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10648 .recover_open = nfs4_open_reclaim,
10649 .recover_lock = nfs4_lock_reclaim,
10650 .establish_clid = nfs41_init_clientid,
10651 .reclaim_complete = nfs41_proc_reclaim_complete,
10652 .detect_trunking = nfs41_discover_server_trunking,
10653 };
10654 #endif /* CONFIG_NFS_V4_1 */
10655
10656 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10657 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10658 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10659 .recover_open = nfs40_open_expired,
10660 .recover_lock = nfs4_lock_expired,
10661 .establish_clid = nfs4_init_clientid,
10662 };
10663
10664 #if defined(CONFIG_NFS_V4_1)
10665 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10666 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10667 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10668 .recover_open = nfs41_open_expired,
10669 .recover_lock = nfs41_lock_expired,
10670 .establish_clid = nfs41_init_clientid,
10671 };
10672 #endif /* CONFIG_NFS_V4_1 */
10673
10674 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10675 .sched_state_renewal = nfs4_proc_async_renew,
10676 .get_state_renewal_cred = nfs4_get_renew_cred,
10677 .renew_lease = nfs4_proc_renew,
10678 };
10679
10680 #if defined(CONFIG_NFS_V4_1)
10681 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10682 .sched_state_renewal = nfs41_proc_async_sequence,
10683 .get_state_renewal_cred = nfs4_get_machine_cred,
10684 .renew_lease = nfs4_proc_sequence,
10685 };
10686 #endif
10687
10688 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10689 .get_locations = _nfs40_proc_get_locations,
10690 .fsid_present = _nfs40_proc_fsid_present,
10691 };
10692
10693 #if defined(CONFIG_NFS_V4_1)
10694 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10695 .get_locations = _nfs41_proc_get_locations,
10696 .fsid_present = _nfs41_proc_fsid_present,
10697 };
10698 #endif /* CONFIG_NFS_V4_1 */
10699
10700 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10701 .minor_version = 0,
10702 .init_caps = NFS_CAP_READDIRPLUS
10703 | NFS_CAP_ATOMIC_OPEN
10704 | NFS_CAP_POSIX_LOCK,
10705 .init_client = nfs40_init_client,
10706 .shutdown_client = nfs40_shutdown_client,
10707 .match_stateid = nfs4_match_stateid,
10708 .find_root_sec = nfs4_find_root_sec,
10709 .free_lock_state = nfs4_release_lockowner,
10710 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10711 .alloc_seqid = nfs_alloc_seqid,
10712 .call_sync_ops = &nfs40_call_sync_ops,
10713 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10714 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10715 .state_renewal_ops = &nfs40_state_renewal_ops,
10716 .mig_recovery_ops = &nfs40_mig_recovery_ops,
10717 };
10718
10719 #if defined(CONFIG_NFS_V4_1)
10720 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10721 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10722 {
10723 return NULL;
10724 }
10725
10726 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10727 .minor_version = 1,
10728 .init_caps = NFS_CAP_READDIRPLUS
10729 | NFS_CAP_ATOMIC_OPEN
10730 | NFS_CAP_POSIX_LOCK
10731 | NFS_CAP_STATEID_NFSV41
10732 | NFS_CAP_ATOMIC_OPEN_V1
10733 | NFS_CAP_LGOPEN
10734 | NFS_CAP_MOVEABLE,
10735 .init_client = nfs41_init_client,
10736 .shutdown_client = nfs41_shutdown_client,
10737 .match_stateid = nfs41_match_stateid,
10738 .find_root_sec = nfs41_find_root_sec,
10739 .free_lock_state = nfs41_free_lock_state,
10740 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10741 .alloc_seqid = nfs_alloc_no_seqid,
10742 .session_trunk = nfs4_test_session_trunk,
10743 .call_sync_ops = &nfs41_call_sync_ops,
10744 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10745 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10746 .state_renewal_ops = &nfs41_state_renewal_ops,
10747 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10748 };
10749 #endif
10750
10751 #if defined(CONFIG_NFS_V4_2)
10752 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10753 .minor_version = 2,
10754 .init_caps = NFS_CAP_READDIRPLUS
10755 | NFS_CAP_ATOMIC_OPEN
10756 | NFS_CAP_POSIX_LOCK
10757 | NFS_CAP_STATEID_NFSV41
10758 | NFS_CAP_ATOMIC_OPEN_V1
10759 | NFS_CAP_LGOPEN
10760 | NFS_CAP_ALLOCATE
10761 | NFS_CAP_COPY
10762 | NFS_CAP_OFFLOAD_CANCEL
10763 | NFS_CAP_COPY_NOTIFY
10764 | NFS_CAP_DEALLOCATE
10765 | NFS_CAP_SEEK
10766 | NFS_CAP_LAYOUTSTATS
10767 | NFS_CAP_CLONE
10768 | NFS_CAP_LAYOUTERROR
10769 | NFS_CAP_READ_PLUS
10770 | NFS_CAP_MOVEABLE,
10771 .init_client = nfs41_init_client,
10772 .shutdown_client = nfs41_shutdown_client,
10773 .match_stateid = nfs41_match_stateid,
10774 .find_root_sec = nfs41_find_root_sec,
10775 .free_lock_state = nfs41_free_lock_state,
10776 .call_sync_ops = &nfs41_call_sync_ops,
10777 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10778 .alloc_seqid = nfs_alloc_no_seqid,
10779 .session_trunk = nfs4_test_session_trunk,
10780 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10781 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10782 .state_renewal_ops = &nfs41_state_renewal_ops,
10783 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10784 };
10785 #endif
10786
10787 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10788 [0] = &nfs_v4_0_minor_ops,
10789 #if defined(CONFIG_NFS_V4_1)
10790 [1] = &nfs_v4_1_minor_ops,
10791 #endif
10792 #if defined(CONFIG_NFS_V4_2)
10793 [2] = &nfs_v4_2_minor_ops,
10794 #endif
10795 };
10796
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10797 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10798 {
10799 ssize_t error, error2, error3;
10800 size_t left = size;
10801
10802 error = generic_listxattr(dentry, list, left);
10803 if (error < 0)
10804 return error;
10805 if (list) {
10806 list += error;
10807 left -= error;
10808 }
10809
10810 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10811 if (error2 < 0)
10812 return error2;
10813
10814 if (list) {
10815 list += error2;
10816 left -= error2;
10817 }
10818
10819 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10820 if (error3 < 0)
10821 return error3;
10822
10823 error += error2 + error3;
10824 if (size && error > size)
10825 return -ERANGE;
10826 return error;
10827 }
10828
nfs4_enable_swap(struct inode * inode)10829 static void nfs4_enable_swap(struct inode *inode)
10830 {
10831 /* The state manager thread must always be running.
10832 * It will notice the client is a swapper, and stay put.
10833 */
10834 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10835
10836 nfs4_schedule_state_manager(clp);
10837 }
10838
nfs4_disable_swap(struct inode * inode)10839 static void nfs4_disable_swap(struct inode *inode)
10840 {
10841 /* The state manager thread will now exit once it is
10842 * woken.
10843 */
10844 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10845
10846 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10847 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10848 wake_up_var(&clp->cl_state);
10849 }
10850
10851 static const struct inode_operations nfs4_dir_inode_operations = {
10852 .create = nfs_create,
10853 .lookup = nfs_lookup,
10854 .atomic_open = nfs_atomic_open,
10855 .link = nfs_link,
10856 .unlink = nfs_unlink,
10857 .symlink = nfs_symlink,
10858 .mkdir = nfs_mkdir,
10859 .rmdir = nfs_rmdir,
10860 .mknod = nfs_mknod,
10861 .rename = nfs_rename,
10862 .permission = nfs_permission,
10863 .getattr = nfs_getattr,
10864 .setattr = nfs_setattr,
10865 .listxattr = nfs4_listxattr,
10866 };
10867
10868 static const struct inode_operations nfs4_file_inode_operations = {
10869 .permission = nfs_permission,
10870 .getattr = nfs_getattr,
10871 .setattr = nfs_setattr,
10872 .listxattr = nfs4_listxattr,
10873 };
10874
10875 const struct nfs_rpc_ops nfs_v4_clientops = {
10876 .version = 4, /* protocol version */
10877 .dentry_ops = &nfs4_dentry_operations,
10878 .dir_inode_ops = &nfs4_dir_inode_operations,
10879 .file_inode_ops = &nfs4_file_inode_operations,
10880 .file_ops = &nfs4_file_operations,
10881 .getroot = nfs4_proc_get_root,
10882 .submount = nfs4_submount,
10883 .try_get_tree = nfs4_try_get_tree,
10884 .getattr = nfs4_proc_getattr,
10885 .setattr = nfs4_proc_setattr,
10886 .lookup = nfs4_proc_lookup,
10887 .lookupp = nfs4_proc_lookupp,
10888 .access = nfs4_proc_access,
10889 .readlink = nfs4_proc_readlink,
10890 .create = nfs4_proc_create,
10891 .remove = nfs4_proc_remove,
10892 .unlink_setup = nfs4_proc_unlink_setup,
10893 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10894 .unlink_done = nfs4_proc_unlink_done,
10895 .rename_setup = nfs4_proc_rename_setup,
10896 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10897 .rename_done = nfs4_proc_rename_done,
10898 .link = nfs4_proc_link,
10899 .symlink = nfs4_proc_symlink,
10900 .mkdir = nfs4_proc_mkdir,
10901 .rmdir = nfs4_proc_rmdir,
10902 .readdir = nfs4_proc_readdir,
10903 .mknod = nfs4_proc_mknod,
10904 .statfs = nfs4_proc_statfs,
10905 .fsinfo = nfs4_proc_fsinfo,
10906 .pathconf = nfs4_proc_pathconf,
10907 .set_capabilities = nfs4_server_capabilities,
10908 .decode_dirent = nfs4_decode_dirent,
10909 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10910 .read_setup = nfs4_proc_read_setup,
10911 .read_done = nfs4_read_done,
10912 .write_setup = nfs4_proc_write_setup,
10913 .write_done = nfs4_write_done,
10914 .commit_setup = nfs4_proc_commit_setup,
10915 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10916 .commit_done = nfs4_commit_done,
10917 .lock = nfs4_proc_lock,
10918 .clear_acl_cache = nfs4_zap_acl_attr,
10919 .close_context = nfs4_close_context,
10920 .open_context = nfs4_atomic_open,
10921 .have_delegation = nfs4_have_delegation,
10922 .return_delegation = nfs4_inode_return_delegation,
10923 .alloc_client = nfs4_alloc_client,
10924 .init_client = nfs4_init_client,
10925 .free_client = nfs4_free_client,
10926 .create_server = nfs4_create_server,
10927 .clone_server = nfs_clone_server,
10928 .discover_trunking = nfs4_discover_trunking,
10929 .enable_swap = nfs4_enable_swap,
10930 .disable_swap = nfs4_disable_swap,
10931 };
10932
10933 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10934 .name = XATTR_NAME_NFSV4_ACL,
10935 .list = nfs4_xattr_list_nfs4_acl,
10936 .get = nfs4_xattr_get_nfs4_acl,
10937 .set = nfs4_xattr_set_nfs4_acl,
10938 };
10939
10940 #if defined(CONFIG_NFS_V4_1)
10941 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10942 .name = XATTR_NAME_NFSV4_DACL,
10943 .list = nfs4_xattr_list_nfs4_dacl,
10944 .get = nfs4_xattr_get_nfs4_dacl,
10945 .set = nfs4_xattr_set_nfs4_dacl,
10946 };
10947
10948 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10949 .name = XATTR_NAME_NFSV4_SACL,
10950 .list = nfs4_xattr_list_nfs4_sacl,
10951 .get = nfs4_xattr_get_nfs4_sacl,
10952 .set = nfs4_xattr_set_nfs4_sacl,
10953 };
10954 #endif
10955
10956 #ifdef CONFIG_NFS_V4_2
10957 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10958 .prefix = XATTR_USER_PREFIX,
10959 .get = nfs4_xattr_get_nfs4_user,
10960 .set = nfs4_xattr_set_nfs4_user,
10961 };
10962 #endif
10963
10964 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10965 &nfs4_xattr_nfs4_acl_handler,
10966 #if defined(CONFIG_NFS_V4_1)
10967 &nfs4_xattr_nfs4_dacl_handler,
10968 &nfs4_xattr_nfs4_sacl_handler,
10969 #endif
10970 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10971 &nfs4_xattr_nfs4_label_handler,
10972 #endif
10973 #ifdef CONFIG_NFS_V4_2
10974 &nfs4_xattr_nfs4_user_handler,
10975 #endif
10976 NULL
10977 };
10978