1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* internal AFS stuff
3 *
4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/compiler.h>
9 #include <linux/kernel.h>
10 #include <linux/ktime.h>
11 #include <linux/fs.h>
12 #include <linux/filelock.h>
13 #include <linux/pagemap.h>
14 #include <linux/rxrpc.h>
15 #include <linux/key.h>
16 #include <linux/workqueue.h>
17 #include <linux/sched.h>
18 #include <linux/fscache.h>
19 #include <linux/backing-dev.h>
20 #include <linux/uuid.h>
21 #include <linux/mm_types.h>
22 #include <linux/dns_resolver.h>
23 #include <net/net_namespace.h>
24 #include <net/netns/generic.h>
25 #include <net/sock.h>
26 #include <net/af_rxrpc.h>
27
28 #include "afs.h"
29 #include "afs_vl.h"
30
31 #define AFS_CELL_MAX_ADDRS 15
32
33 struct pagevec;
34 struct afs_call;
35 struct afs_vnode;
36 struct afs_server_probe;
37
38 /*
39 * Partial file-locking emulation mode. (The problem being that AFS3 only
40 * allows whole-file locks and no upgrading/downgrading).
41 */
42 enum afs_flock_mode {
43 afs_flock_mode_unset,
44 afs_flock_mode_local, /* Local locking only */
45 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
46 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
47 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
48 };
49
50 struct afs_fs_context {
51 bool force; /* T to force cell type */
52 bool autocell; /* T if set auto mount operation */
53 bool dyn_root; /* T if dynamic root */
54 bool no_cell; /* T if the source is "none" (for dynroot) */
55 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
56 afs_voltype_t type; /* type of volume requested */
57 unsigned int volnamesz; /* size of volume name */
58 const char *volname; /* name of volume to mount */
59 struct afs_net *net; /* the AFS net namespace stuff */
60 struct afs_cell *cell; /* cell in which to find volume */
61 struct afs_volume *volume; /* volume record */
62 struct key *key; /* key to use for secure mounting */
63 };
64
65 enum afs_call_state {
66 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
67 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
68 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
69 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
70 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
71 AFS_CALL_SV_REPLYING, /* Server: Replying */
72 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
73 AFS_CALL_COMPLETE, /* Completed or failed */
74 };
75
76 /*
77 * Address preferences.
78 */
79 struct afs_addr_preference {
80 union {
81 struct in_addr ipv4_addr; /* AF_INET address to compare against */
82 struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */
83 };
84 sa_family_t family; /* Which address to use */
85 u16 prio; /* Priority */
86 u8 subnet_mask; /* How many bits to compare */
87 };
88
89 struct afs_addr_preference_list {
90 struct rcu_head rcu;
91 u16 version; /* Incremented when prefs list changes */
92 u8 ipv6_off; /* Offset of IPv6 addresses */
93 u8 nr; /* Number of addresses in total */
94 u8 max_prefs; /* Number of prefs allocated */
95 struct afs_addr_preference prefs[] __counted_by(max_prefs);
96 };
97
98 struct afs_address {
99 struct rxrpc_peer *peer;
100 short last_error; /* Last error from this address */
101 u16 prio; /* Address priority */
102 };
103
104 /*
105 * List of server addresses.
106 */
107 struct afs_addr_list {
108 struct rcu_head rcu;
109 refcount_t usage;
110 u32 version; /* Version */
111 unsigned int debug_id;
112 unsigned int addr_pref_version; /* Version of address preference list */
113 unsigned char max_addrs;
114 unsigned char nr_addrs;
115 unsigned char preferred; /* Preferred address */
116 unsigned char nr_ipv4; /* Number of IPv4 addresses */
117 enum dns_record_source source:8;
118 enum dns_lookup_status status:8;
119 unsigned long probe_failed; /* Mask of addrs that failed locally/ICMP */
120 unsigned long responded; /* Mask of addrs that responded */
121 struct afs_address addrs[] __counted_by(max_addrs);
122 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
123 };
124
125 /*
126 * a record of an in-progress RxRPC call
127 */
128 struct afs_call {
129 const struct afs_call_type *type; /* type of call */
130 wait_queue_head_t waitq; /* processes awaiting completion */
131 struct work_struct async_work; /* async I/O processor */
132 struct work_struct work; /* actual work processor */
133 struct work_struct free_work; /* Deferred free processor */
134 struct rxrpc_call *rxcall; /* RxRPC call handle */
135 struct rxrpc_peer *peer; /* Remote endpoint */
136 struct key *key; /* security for this call */
137 struct afs_net *net; /* The network namespace */
138 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
139 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
140 void *request; /* request data (first part) */
141 size_t iov_len; /* Size of *iter to be used */
142 struct iov_iter def_iter; /* Default buffer/data iterator */
143 struct iov_iter *write_iter; /* Iterator defining write to be made */
144 struct iov_iter *iter; /* Iterator currently in use */
145 union { /* Convenience for ->def_iter */
146 struct kvec kvec[1];
147 struct bio_vec bvec[1];
148 };
149 void *buffer; /* reply receive buffer */
150 union {
151 struct afs_endpoint_state *probe;
152 struct afs_addr_list *vl_probe;
153 struct afs_addr_list *ret_alist;
154 struct afs_vldb_entry *ret_vldb;
155 char *ret_str;
156 };
157 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
158 unsigned char probe_index; /* Address in ->probe_alist */
159 struct afs_operation *op;
160 unsigned int server_index;
161 refcount_t ref;
162 enum afs_call_state state;
163 spinlock_t state_lock;
164 int error; /* error code */
165 u32 abort_code; /* Remote abort ID or 0 */
166 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
167 unsigned request_size; /* size of request data */
168 unsigned reply_max; /* maximum size of reply */
169 unsigned count2; /* count used in unmarshalling */
170 unsigned char unmarshall; /* unmarshalling phase */
171 bool drop_ref; /* T if need to drop ref for incoming call */
172 bool need_attention; /* T if RxRPC poked us */
173 bool async; /* T if asynchronous */
174 bool upgrade; /* T to request service upgrade */
175 bool intr; /* T if interruptible */
176 bool unmarshalling_error; /* T if an unmarshalling error occurred */
177 bool responded; /* Got a response from the call (may be abort) */
178 u16 service_id; /* Actual service ID (after upgrade) */
179 unsigned int debug_id; /* Trace ID */
180 u32 operation_ID; /* operation ID for an incoming call */
181 u32 count; /* count for use in unmarshalling */
182 union { /* place to extract temporary data */
183 struct {
184 __be32 tmp_u;
185 __be32 tmp;
186 } __attribute__((packed));
187 __be64 tmp64;
188 };
189 ktime_t issue_time; /* Time of issue of operation */
190 };
191
192 struct afs_call_type {
193 const char *name;
194 unsigned int op; /* Really enum afs_fs_operation */
195
196 /* deliver request or reply data to an call
197 * - returning an error will cause the call to be aborted
198 */
199 int (*deliver)(struct afs_call *call);
200
201 /* clean up a call */
202 void (*destructor)(struct afs_call *call);
203
204 /* Work function */
205 void (*work)(struct work_struct *work);
206
207 /* Call done function (gets called immediately on success or failure) */
208 void (*done)(struct afs_call *call);
209 };
210
211 /*
212 * Key available for writeback on a file.
213 */
214 struct afs_wb_key {
215 refcount_t usage;
216 struct key *key;
217 struct list_head vnode_link; /* Link in vnode->wb_keys */
218 };
219
220 /*
221 * AFS open file information record. Pointed to by file->private_data.
222 */
223 struct afs_file {
224 struct key *key; /* The key this file was opened with */
225 struct afs_wb_key *wb; /* Writeback key record for this file */
226 };
227
afs_file_key(struct file * file)228 static inline struct key *afs_file_key(struct file *file)
229 {
230 struct afs_file *af = file->private_data;
231
232 return af->key;
233 }
234
235 /*
236 * Record of an outstanding read operation on a vnode.
237 */
238 struct afs_read {
239 loff_t pos; /* Where to start reading */
240 loff_t len; /* How much we're asking for */
241 loff_t actual_len; /* How much we're actually getting */
242 loff_t file_size; /* File size returned by server */
243 struct key *key; /* The key to use to reissue the read */
244 struct afs_vnode *vnode; /* The file being read into. */
245 struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */
246 afs_dataversion_t data_version; /* Version number returned by server */
247 refcount_t usage;
248 unsigned int call_debug_id;
249 unsigned int nr_pages;
250 int error;
251 void (*done)(struct afs_read *);
252 void (*cleanup)(struct afs_read *);
253 struct iov_iter *iter; /* Iterator representing the buffer */
254 struct iov_iter def_iter; /* Default iterator */
255 };
256
257 /*
258 * AFS superblock private data
259 * - there's one superblock per volume
260 */
261 struct afs_super_info {
262 struct net *net_ns; /* Network namespace */
263 struct afs_cell *cell; /* The cell in which the volume resides */
264 struct afs_volume *volume; /* volume record */
265 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
266 bool dyn_root; /* True if dynamic root */
267 };
268
AFS_FS_S(struct super_block * sb)269 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
270 {
271 return sb->s_fs_info;
272 }
273
274 extern struct file_system_type afs_fs_type;
275
276 /*
277 * Set of substitutes for @sys.
278 */
279 struct afs_sysnames {
280 #define AFS_NR_SYSNAME 16
281 char *subs[AFS_NR_SYSNAME];
282 refcount_t usage;
283 unsigned short nr;
284 char blank[1];
285 };
286
287 /*
288 * AFS network namespace record.
289 */
290 struct afs_net {
291 struct net *net; /* Backpointer to the owning net namespace */
292 struct afs_uuid uuid;
293 bool live; /* F if this namespace is being removed */
294
295 /* AF_RXRPC I/O stuff */
296 struct socket *socket;
297 struct afs_call *spare_incoming_call;
298 struct work_struct charge_preallocation_work;
299 struct mutex socket_mutex;
300 atomic_t nr_outstanding_calls;
301 atomic_t nr_superblocks;
302
303 /* Cell database */
304 struct rb_root cells;
305 struct afs_cell *ws_cell;
306 struct work_struct cells_manager;
307 struct timer_list cells_timer;
308 atomic_t cells_outstanding;
309 struct rw_semaphore cells_lock;
310 struct mutex cells_alias_lock;
311
312 struct mutex proc_cells_lock;
313 struct hlist_head proc_cells;
314
315 /* Known servers. Theoretically each fileserver can only be in one
316 * cell, but in practice, people create aliases and subsets and there's
317 * no easy way to distinguish them.
318 */
319 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */
320 struct rb_root fs_servers; /* afs_server (by server UUID or address) */
321 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
322 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
323 struct hlist_head fs_proc; /* procfs servers list */
324
325 struct hlist_head fs_addresses; /* afs_server (by lowest IPv6 addr) */
326 seqlock_t fs_addr_lock; /* For fs_addresses[46] */
327
328 struct work_struct fs_manager;
329 struct timer_list fs_timer;
330
331 struct work_struct fs_prober;
332 struct timer_list fs_probe_timer;
333 atomic_t servers_outstanding;
334
335 /* File locking renewal management */
336 struct mutex lock_manager_mutex;
337
338 /* Misc */
339 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
340 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
341 struct afs_sysnames *sysnames;
342 rwlock_t sysnames_lock;
343 struct afs_addr_preference_list __rcu *address_prefs;
344 u16 address_pref_version;
345
346 /* Statistics counters */
347 atomic_t n_lookup; /* Number of lookups done */
348 atomic_t n_reval; /* Number of dentries needing revalidation */
349 atomic_t n_inval; /* Number of invalidations by the server */
350 atomic_t n_relpg; /* Number of invalidations by release_folio */
351 atomic_t n_read_dir; /* Number of directory pages read */
352 atomic_t n_dir_cr; /* Number of directory entry creation edits */
353 atomic_t n_dir_rm; /* Number of directory entry removal edits */
354 atomic_t n_stores; /* Number of store ops */
355 atomic_long_t n_store_bytes; /* Number of bytes stored */
356 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
357 atomic_t n_fetches; /* Number of data fetch ops */
358 };
359
360 extern const char afs_init_sysname[];
361
362 enum afs_cell_state {
363 AFS_CELL_UNSET,
364 AFS_CELL_ACTIVATING,
365 AFS_CELL_ACTIVE,
366 AFS_CELL_DEACTIVATING,
367 AFS_CELL_INACTIVE,
368 AFS_CELL_FAILED,
369 AFS_CELL_REMOVED,
370 };
371
372 /*
373 * AFS cell record.
374 *
375 * This is a tricky concept to get right as it is possible to create aliases
376 * simply by pointing AFSDB/SRV records for two names at the same set of VL
377 * servers; it is also possible to do things like setting up two sets of VL
378 * servers, one of which provides a superset of the volumes provided by the
379 * other (for internal/external division, for example).
380 *
381 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
382 * servers and (b) a cell's name is used by the client to select the key to use
383 * for authentication and encryption. The cell name is not typically used in
384 * the protocol.
385 *
386 * Two cells are determined to be aliases if they have an explicit alias (YFS
387 * only), share any VL servers in common or have at least one volume in common.
388 * "In common" means that the address list of the VL servers or the fileservers
389 * share at least one endpoint.
390 */
391 struct afs_cell {
392 union {
393 struct rcu_head rcu;
394 struct rb_node net_node; /* Node in net->cells */
395 };
396 struct afs_net *net;
397 struct afs_cell *alias_of; /* The cell this is an alias of */
398 struct afs_volume *root_volume; /* The root.cell volume if there is one */
399 struct key *anonymous_key; /* anonymous user key for this cell */
400 struct work_struct manager; /* Manager for init/deinit/dns */
401 struct hlist_node proc_link; /* /proc cell list link */
402 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
403 time64_t last_inactive; /* Time of last drop of usage count */
404 refcount_t ref; /* Struct refcount */
405 atomic_t active; /* Active usage counter */
406 unsigned long flags;
407 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
408 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
409 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
410 enum afs_cell_state state;
411 short error;
412 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
413 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
414 unsigned int dns_lookup_count; /* Counter of DNS lookups */
415 unsigned int debug_id;
416
417 /* The volumes belonging to this cell */
418 struct rw_semaphore vs_lock; /* Lock for server->volumes */
419 struct rb_root volumes; /* Tree of volumes on this server */
420 struct hlist_head proc_volumes; /* procfs volume list */
421 seqlock_t volume_lock; /* For volumes */
422
423 /* Active fileserver interaction state. */
424 struct rb_root fs_servers; /* afs_server (by server UUID) */
425 seqlock_t fs_lock; /* For fs_servers */
426
427 /* VL server list. */
428 rwlock_t vl_servers_lock; /* Lock on vl_servers */
429 struct afs_vlserver_list __rcu *vl_servers;
430
431 u8 name_len; /* Length of name */
432 char *name; /* Cell name, case-flattened and NUL-padded */
433 };
434
435 /*
436 * Volume Location server record.
437 */
438 struct afs_vlserver {
439 struct rcu_head rcu;
440 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
441 unsigned long flags;
442 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
443 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
444 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
445 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
446 rwlock_t lock; /* Lock on addresses */
447 refcount_t ref;
448 unsigned int rtt; /* Server's current RTT in uS */
449 unsigned int debug_id;
450
451 /* Probe state */
452 wait_queue_head_t probe_wq;
453 atomic_t probe_outstanding;
454 spinlock_t probe_lock;
455 struct {
456 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
457 u32 abort_code;
458 short error;
459 unsigned short flags;
460 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
461 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
462 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
463 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
464 } probe;
465
466 u16 service_id; /* Service ID we're using */
467 u16 port;
468 u16 name_len; /* Length of name */
469 char name[]; /* Server name, case-flattened */
470 };
471
472 /*
473 * Weighted list of Volume Location servers.
474 */
475 struct afs_vlserver_entry {
476 u16 priority; /* Preference (as SRV) */
477 u16 weight; /* Weight (as SRV) */
478 enum dns_record_source source:8;
479 enum dns_lookup_status status:8;
480 struct afs_vlserver *server;
481 };
482
483 struct afs_vlserver_list {
484 struct rcu_head rcu;
485 refcount_t ref;
486 u8 nr_servers;
487 u8 index; /* Server currently in use */
488 u8 preferred; /* Preferred server */
489 enum dns_record_source source:8;
490 enum dns_lookup_status status:8;
491 rwlock_t lock;
492 struct afs_vlserver_entry servers[];
493 };
494
495 /*
496 * Cached VLDB entry.
497 *
498 * This is pointed to by cell->vldb_entries, indexed by name.
499 */
500 struct afs_vldb_entry {
501 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
502
503 unsigned long flags;
504 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
505 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
506 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
507 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
508 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
509
510 uuid_t fs_server[AFS_NMAXNSERVERS];
511 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
512 u8 fs_mask[AFS_NMAXNSERVERS];
513 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
514 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
515 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
516 u8 vlsf_flags[AFS_NMAXNSERVERS];
517 short error;
518 u8 nr_servers; /* Number of server records */
519 u8 name_len;
520 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
521 };
522
523 /*
524 * Fileserver endpoint state. The records the addresses of a fileserver's
525 * endpoints and the state and result of a round of probing on them. This
526 * allows the rotation algorithm to access those results without them being
527 * erased by a subsequent round of probing.
528 */
529 struct afs_endpoint_state {
530 struct rcu_head rcu;
531 struct afs_addr_list *addresses; /* The addresses being probed */
532 unsigned long responsive_set; /* Bitset of responsive endpoints */
533 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
534 refcount_t ref;
535 unsigned int server_id; /* Debug ID of server */
536 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
537 atomic_t nr_probing; /* Number of outstanding probes */
538 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
539 s32 abort_code;
540 short error;
541 unsigned long flags;
542 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
543 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
544 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
545 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
546 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
547 };
548
549 /*
550 * Record of fileserver with which we're actively communicating.
551 */
552 struct afs_server {
553 struct rcu_head rcu;
554 union {
555 uuid_t uuid; /* Server ID */
556 struct afs_uuid _uuid;
557 };
558
559 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
560 struct rb_node uuid_rb; /* Link in net->fs_servers */
561 struct afs_server __rcu *uuid_next; /* Next server with same UUID */
562 struct afs_server *uuid_prev; /* Previous server with same UUID */
563 struct list_head probe_link; /* Link in net->fs_probe_list */
564 struct hlist_node addr_link; /* Link in net->fs_addresses6 */
565 struct hlist_node proc_link; /* Link in net->fs_proc */
566 struct list_head volumes; /* RCU list of afs_server_entry objects */
567 struct afs_server *gc_next; /* Next server in manager's list */
568 time64_t unuse_time; /* Time at which last unused */
569 unsigned long flags;
570 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
571 #define AFS_SERVER_FL_UPDATING 1
572 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
573 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */
574 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */
575 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */
576 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
577 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
578 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
579 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
580 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
581 refcount_t ref; /* Object refcount */
582 atomic_t active; /* Active user count */
583 u32 addr_version; /* Address list version */
584 u16 service_id; /* Service ID we're using. */
585 unsigned int rtt; /* Server's current RTT in uS */
586 unsigned int debug_id; /* Debugging ID for traces */
587
588 /* file service access */
589 rwlock_t fs_lock; /* access lock */
590
591 /* Probe state */
592 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
593 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
594 wait_queue_head_t probe_wq;
595 unsigned int probe_counter; /* Number of probes issued */
596 spinlock_t probe_lock;
597 };
598
599 enum afs_ro_replicating {
600 AFS_RO_NOT_REPLICATING, /* Not doing replication */
601 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
602 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
603 } __mode(byte);
604
605 /*
606 * Replaceable volume server list.
607 */
608 struct afs_server_entry {
609 struct afs_server *server;
610 struct afs_volume *volume;
611 struct list_head slink; /* Link in server->volumes */
612 time64_t cb_expires_at; /* Time at which volume-level callback expires */
613 unsigned long flags;
614 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
615 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
616 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
617 };
618
619 struct afs_server_list {
620 struct rcu_head rcu;
621 refcount_t usage;
622 bool attached; /* T if attached to servers */
623 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
624 unsigned char nr_servers;
625 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
626 unsigned int seq; /* Set to ->servers_seq when installed */
627 rwlock_t lock;
628 struct afs_server_entry servers[];
629 };
630
631 /*
632 * Live AFS volume management.
633 */
634 struct afs_volume {
635 struct rcu_head rcu;
636 afs_volid_t vid; /* The volume ID of this volume */
637 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
638 refcount_t ref;
639 time64_t update_at; /* Time at which to next update */
640 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
641 struct rb_node cell_node; /* Link in cell->volumes */
642 struct hlist_node proc_link; /* Link in cell->proc_volumes */
643 struct super_block __rcu *sb; /* Superblock on which inodes reside */
644 struct work_struct destructor; /* Deferred destructor */
645 unsigned long flags;
646 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
647 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
648 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
649 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
650 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
651 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
652 #ifdef CONFIG_AFS_FSCACHE
653 struct fscache_volume *cache; /* Caching cookie */
654 #endif
655 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
656 rwlock_t servers_lock; /* Lock for ->servers */
657 unsigned int servers_seq; /* Incremented each time ->servers changes */
658
659 /* RO release tracking */
660 struct mutex volsync_lock; /* Time/state evaluation lock */
661 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
662 time64_t update_time; /* Volume update time (or TIME64_MIN) */
663
664 /* Callback management */
665 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
666 time64_t cb_expires_at; /* Earliest volume callback expiry time */
667 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
668 atomic_t cb_v_break; /* Volume-break event counter. */
669 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
670 atomic_t cb_scrub; /* Scrub-all-data event counter. */
671 rwlock_t cb_v_break_lock;
672 struct rw_semaphore open_mmaps_lock;
673 struct list_head open_mmaps; /* List of vnodes that are mmapped */
674
675 afs_voltype_t type; /* type of volume */
676 char type_force; /* force volume type (suppress R/O -> R/W) */
677 u8 name_len;
678 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
679 };
680
681 enum afs_lock_state {
682 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
683 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
684 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
685 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
686 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
687 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
688 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
689 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
690 };
691
692 /*
693 * AFS inode private data.
694 *
695 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
696 * leak from one inode to another.
697 */
698 struct afs_vnode {
699 struct netfs_inode netfs; /* Netfslib context and vfs inode */
700 struct afs_volume *volume; /* volume on which vnode resides */
701 struct afs_fid fid; /* the file identifier for this inode */
702 struct afs_file_status status; /* AFS status info for this file */
703 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
704 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
705 struct mutex io_lock; /* Lock for serialising I/O on this mutex */
706 struct rw_semaphore validate_lock; /* lock for validating this vnode */
707 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
708 struct key *silly_key; /* Silly rename key */
709 spinlock_t wb_lock; /* lock for wb_keys */
710 spinlock_t lock; /* waitqueue/flags lock */
711 unsigned long flags;
712 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
713 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
714 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
715 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
716 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
717 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
718 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
719 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
720 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
721 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
722
723 struct list_head wb_keys; /* List of keys available for writeback */
724 struct list_head pending_locks; /* locks waiting to be granted */
725 struct list_head granted_locks; /* locks granted on this file */
726 struct delayed_work lock_work; /* work to be done in locking */
727 struct key *lock_key; /* Key to be used in lock ops */
728 ktime_t locked_at; /* Time at which lock obtained */
729 enum afs_lock_state lock_state : 8;
730 afs_lock_type_t lock_type : 8;
731
732 /* outstanding callback notification on this file */
733 struct work_struct cb_work; /* Work for mmap'd files */
734 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
735 void *cb_server; /* Server with callback/filelock */
736 atomic_t cb_nr_mmap; /* Number of mmaps */
737 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
738 unsigned int cb_scrub; /* Scrub counter on ->volume */
739 unsigned int cb_break; /* Break counter on vnode */
740 unsigned int cb_v_check; /* Break check counter on ->volume */
741 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
742
743 atomic64_t cb_expires_at; /* time at which callback expires */
744 #define AFS_NO_CB_PROMISE TIME64_MIN
745 };
746
afs_vnode_cache(struct afs_vnode * vnode)747 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
748 {
749 #ifdef CONFIG_AFS_FSCACHE
750 return netfs_i_cookie(&vnode->netfs);
751 #else
752 return NULL;
753 #endif
754 }
755
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)756 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
757 struct fscache_cookie *cookie)
758 {
759 #ifdef CONFIG_AFS_FSCACHE
760 vnode->netfs.cache = cookie;
761 if (cookie)
762 mapping_set_release_always(vnode->netfs.inode.i_mapping);
763 #endif
764 }
765
766 /*
767 * cached security record for one user's attempt to access a vnode
768 */
769 struct afs_permit {
770 struct key *key; /* RxRPC ticket holding a security context */
771 afs_access_t access; /* CallerAccess value for this key */
772 };
773
774 /*
775 * Immutable cache of CallerAccess records from attempts to access vnodes.
776 * These may be shared between multiple vnodes.
777 */
778 struct afs_permits {
779 struct rcu_head rcu;
780 struct hlist_node hash_node; /* Link in hash */
781 unsigned long h; /* Hash value for this permit list */
782 refcount_t usage;
783 unsigned short nr_permits; /* Number of records */
784 bool invalidated; /* Invalidated due to key change */
785 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
786 };
787
788 /*
789 * Error prioritisation and accumulation.
790 */
791 struct afs_error {
792 s32 abort_code; /* Cumulative abort code */
793 short error; /* Cumulative error */
794 bool responded; /* T if server responded */
795 bool aborted; /* T if ->error is from an abort */
796 };
797
798 /*
799 * Cursor for iterating over a set of volume location servers.
800 */
801 struct afs_vl_cursor {
802 struct afs_cell *cell; /* The cell we're querying */
803 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
804 struct afs_vlserver *server; /* Server on which this resides */
805 struct afs_addr_list *alist; /* Current address list (pins ref) */
806 struct key *key; /* Key for the server */
807 unsigned long untried_servers; /* Bitmask of untried servers */
808 unsigned long addr_tried; /* Tried addresses */
809 struct afs_error cumul_error; /* Cumulative error */
810 unsigned int debug_id;
811 s32 call_abort_code;
812 short call_error; /* Error from single call */
813 short server_index; /* Current server */
814 signed char addr_index; /* Current address */
815 unsigned short flags;
816 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
817 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
818 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
819 short nr_iterations; /* Number of server iterations */
820 bool call_responded; /* T if the current address responded */
821 };
822
823 /*
824 * Fileserver state tracking for an operation. An array of these is kept,
825 * indexed by server index.
826 */
827 struct afs_server_state {
828 /* Tracking of fileserver probe state. Other operations may interfere
829 * by probing a fileserver when accessing other volumes.
830 */
831 unsigned int probe_seq;
832 unsigned long untried_addrs; /* Addresses we haven't tried yet */
833 struct wait_queue_entry probe_waiter;
834 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
835 };
836
837 /*
838 * Fileserver operation methods.
839 */
840 struct afs_operation_ops {
841 void (*issue_afs_rpc)(struct afs_operation *op);
842 void (*issue_yfs_rpc)(struct afs_operation *op);
843 void (*success)(struct afs_operation *op);
844 void (*aborted)(struct afs_operation *op);
845 void (*failed)(struct afs_operation *op);
846 void (*edit_dir)(struct afs_operation *op);
847 void (*put)(struct afs_operation *op);
848 };
849
850 struct afs_vnode_param {
851 struct afs_vnode *vnode;
852 struct afs_fid fid; /* Fid to access */
853 struct afs_status_cb scb; /* Returned status and callback promise */
854 afs_dataversion_t dv_before; /* Data version before the call */
855 unsigned int cb_break_before; /* cb_break before the call */
856 u8 dv_delta; /* Expected change in data version */
857 bool put_vnode:1; /* T if we have a ref on the vnode */
858 bool need_io_lock:1; /* T if we need the I/O lock on this */
859 bool update_ctime:1; /* Need to update the ctime */
860 bool set_size:1; /* Must update i_size */
861 bool op_unlinked:1; /* True if file was unlinked by op */
862 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
863 bool modification:1; /* Set if the content gets modified */
864 };
865
866 /*
867 * Fileserver operation wrapper, handling server and address rotation
868 * asynchronously. May make simultaneous calls to multiple servers.
869 */
870 struct afs_operation {
871 struct afs_net *net; /* Network namespace */
872 struct key *key; /* Key for the cell */
873 const struct afs_call_type *type; /* Type of call done */
874 const struct afs_operation_ops *ops;
875
876 /* Parameters/results for the operation */
877 struct afs_volume *volume; /* Volume being accessed */
878 struct afs_vnode_param file[2];
879 struct afs_vnode_param *more_files;
880 struct afs_volsync pre_volsync; /* Volsync before op */
881 struct afs_volsync volsync; /* Volsync returned by op */
882 struct dentry *dentry; /* Dentry to be altered */
883 struct dentry *dentry_2; /* Second dentry to be altered */
884 struct timespec64 mtime; /* Modification time to record */
885 struct timespec64 ctime; /* Change time to set */
886 struct afs_error cumul_error; /* Cumulative error */
887 short nr_files; /* Number of entries in file[], more_files */
888 unsigned int debug_id;
889
890 unsigned int cb_v_break; /* Volume break counter before op */
891
892 union {
893 struct {
894 int which; /* Which ->file[] to fetch for */
895 } fetch_status;
896 struct {
897 int reason; /* enum afs_edit_dir_reason */
898 mode_t mode;
899 const char *symlink;
900 } create;
901 struct {
902 bool need_rehash;
903 } unlink;
904 struct {
905 struct dentry *rehash;
906 struct dentry *tmp;
907 bool new_negative;
908 } rename;
909 struct {
910 struct afs_read *req;
911 } fetch;
912 struct {
913 afs_lock_type_t type;
914 } lock;
915 struct {
916 struct iov_iter *write_iter;
917 loff_t pos;
918 loff_t size;
919 loff_t i_size;
920 } store;
921 struct {
922 struct iattr *attr;
923 loff_t old_i_size;
924 } setattr;
925 struct afs_acl *acl;
926 struct yfs_acl *yacl;
927 struct {
928 struct afs_volume_status vs;
929 struct kstatfs *buf;
930 } volstatus;
931 };
932
933 /* Fileserver iteration state */
934 struct afs_server_list *server_list; /* Current server list (pins ref) */
935 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
936 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
937 struct afs_server_state *server_states; /* States of the servers involved */
938 struct afs_call *call;
939 unsigned long untried_servers; /* Bitmask of untried servers */
940 unsigned long addr_tried; /* Tried addresses */
941 s32 call_abort_code; /* Abort code from single call */
942 short call_error; /* Error from single call */
943 short server_index; /* Current server */
944 short nr_iterations; /* Number of server iterations */
945 signed char addr_index; /* Current address */
946 bool call_responded; /* T if the current address responded */
947
948 unsigned int flags;
949 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
950 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
951 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
952 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
953 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
954 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
955 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
956 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
957 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
958 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
959 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
960 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
961 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
962 };
963
964 /*
965 * Cache auxiliary data.
966 */
967 struct afs_vnode_cache_aux {
968 __be64 data_version;
969 } __packed;
970
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)971 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
972 struct afs_vnode_cache_aux *aux)
973 {
974 aux->data_version = cpu_to_be64(vnode->status.data_version);
975 }
976
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)977 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
978 {
979 struct afs_vnode_cache_aux aux;
980
981 afs_set_cache_aux(vnode, &aux);
982 fscache_invalidate(afs_vnode_cache(vnode), &aux,
983 i_size_read(&vnode->netfs.inode), flags);
984 }
985
986 #include <trace/events/afs.h>
987
988 /*****************************************************************************/
989 /*
990 * addr_list.c
991 */
992 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
993 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
994 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
995 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
996 const char *, size_t, char,
997 unsigned short, unsigned short);
998 bool afs_addr_list_same(const struct afs_addr_list *a,
999 const struct afs_addr_list *b);
1000 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
1001
1002 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1003 __be32 xdr, u16 port);
1004 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1005 __be32 *xdr, u16 port);
1006
1007 /*
1008 * addr_prefs.c
1009 */
1010 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1011 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1012 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1013
1014 /*
1015 * callback.c
1016 */
1017 extern void afs_invalidate_mmap_work(struct work_struct *);
1018 extern void afs_init_callback_state(struct afs_server *);
1019 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1020 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1021 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1022
afs_calc_vnode_cb_break(struct afs_vnode * vnode)1023 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1024 {
1025 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1026 }
1027
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1028 static inline bool afs_cb_is_broken(unsigned int cb_break,
1029 const struct afs_vnode *vnode)
1030 {
1031 return cb_break != (vnode->cb_break +
1032 atomic_read(&vnode->volume->cb_ro_snapshot) +
1033 atomic_read(&vnode->volume->cb_scrub));
1034 }
1035
1036 /*
1037 * cell.c
1038 */
1039 extern int afs_cell_init(struct afs_net *, const char *);
1040 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1041 enum afs_cell_trace);
1042 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1043 const char *, bool);
1044 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1045 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1046 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1047 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1048 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1049 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1050 extern void afs_manage_cells(struct work_struct *);
1051 extern void afs_cells_timer(struct timer_list *);
1052 extern void __net_exit afs_cell_purge(struct afs_net *);
1053
1054 /*
1055 * cmservice.c
1056 */
1057 extern bool afs_cm_incoming_call(struct afs_call *);
1058
1059 /*
1060 * dir.c
1061 */
1062 extern const struct file_operations afs_dir_file_operations;
1063 extern const struct inode_operations afs_dir_inode_operations;
1064 extern const struct address_space_operations afs_dir_aops;
1065 extern const struct dentry_operations afs_fs_dentry_operations;
1066
1067 extern void afs_d_release(struct dentry *);
1068 extern void afs_check_for_remote_deletion(struct afs_operation *);
1069
1070 /*
1071 * dir_edit.c
1072 */
1073 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1074 enum afs_edit_dir_reason);
1075 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1076 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
1077 enum afs_edit_dir_reason why);
1078
1079 /*
1080 * dir_silly.c
1081 */
1082 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1083 struct dentry *, struct key *);
1084 extern int afs_silly_iput(struct dentry *, struct inode *);
1085
1086 /*
1087 * dynroot.c
1088 */
1089 extern const struct inode_operations afs_dynroot_inode_operations;
1090 extern const struct dentry_operations afs_dynroot_dentry_operations;
1091
1092 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1093 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1094 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1095 extern int afs_dynroot_populate(struct super_block *);
1096 extern void afs_dynroot_depopulate(struct super_block *);
1097
1098 /*
1099 * file.c
1100 */
1101 extern const struct address_space_operations afs_file_aops;
1102 extern const struct address_space_operations afs_symlink_aops;
1103 extern const struct inode_operations afs_file_inode_operations;
1104 extern const struct file_operations afs_file_operations;
1105 extern const struct netfs_request_ops afs_req_ops;
1106
1107 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1108 extern void afs_put_wb_key(struct afs_wb_key *);
1109 extern int afs_open(struct inode *, struct file *);
1110 extern int afs_release(struct inode *, struct file *);
1111 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1112 extern struct afs_read *afs_alloc_read(gfp_t);
1113 extern void afs_put_read(struct afs_read *);
1114
afs_get_read(struct afs_read * req)1115 static inline struct afs_read *afs_get_read(struct afs_read *req)
1116 {
1117 refcount_inc(&req->usage);
1118 return req;
1119 }
1120
1121 /*
1122 * flock.c
1123 */
1124 extern struct workqueue_struct *afs_lock_manager;
1125
1126 extern void afs_lock_op_done(struct afs_call *);
1127 extern void afs_lock_work(struct work_struct *);
1128 extern void afs_lock_may_be_available(struct afs_vnode *);
1129 extern int afs_lock(struct file *, int, struct file_lock *);
1130 extern int afs_flock(struct file *, int, struct file_lock *);
1131
1132 /*
1133 * fsclient.c
1134 */
1135 extern void afs_fs_fetch_status(struct afs_operation *);
1136 extern void afs_fs_fetch_data(struct afs_operation *);
1137 extern void afs_fs_create_file(struct afs_operation *);
1138 extern void afs_fs_make_dir(struct afs_operation *);
1139 extern void afs_fs_remove_file(struct afs_operation *);
1140 extern void afs_fs_remove_dir(struct afs_operation *);
1141 extern void afs_fs_link(struct afs_operation *);
1142 extern void afs_fs_symlink(struct afs_operation *);
1143 extern void afs_fs_rename(struct afs_operation *);
1144 extern void afs_fs_store_data(struct afs_operation *);
1145 extern void afs_fs_setattr(struct afs_operation *);
1146 extern void afs_fs_get_volume_status(struct afs_operation *);
1147 extern void afs_fs_set_lock(struct afs_operation *);
1148 extern void afs_fs_extend_lock(struct afs_operation *);
1149 extern void afs_fs_release_lock(struct afs_operation *);
1150 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1151 struct afs_address *addr, struct key *key);
1152 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1153 struct afs_endpoint_state *estate, unsigned int addr_index,
1154 struct key *key);
1155 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1156
1157 struct afs_acl {
1158 u32 size;
1159 u8 data[] __counted_by(size);
1160 };
1161
1162 extern void afs_fs_fetch_acl(struct afs_operation *);
1163 extern void afs_fs_store_acl(struct afs_operation *);
1164
1165 /*
1166 * fs_operation.c
1167 */
1168 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1169 extern int afs_put_operation(struct afs_operation *);
1170 extern bool afs_begin_vnode_operation(struct afs_operation *);
1171 extern void afs_wait_for_operation(struct afs_operation *);
1172 extern int afs_do_sync_operation(struct afs_operation *);
1173
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1174 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1175 struct afs_vnode *vnode)
1176 {
1177 op->file[n].vnode = vnode;
1178 op->file[n].need_io_lock = true;
1179 }
1180
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1181 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1182 const struct afs_fid *fid)
1183 {
1184 op->file[n].fid = *fid;
1185 }
1186
1187 /*
1188 * fs_probe.c
1189 */
1190 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1191 enum afs_estate_trace where);
1192 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1193 extern void afs_fileserver_probe_result(struct afs_call *);
1194 void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1195 struct afs_addr_list *new_addrs, struct key *key);
1196 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1197 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1198 extern void afs_fs_probe_dispatcher(struct work_struct *);
1199 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1200 unsigned long exclude, bool is_intr);
1201 extern void afs_fs_probe_cleanup(struct afs_net *);
1202
1203 /*
1204 * inode.c
1205 */
1206 extern const struct afs_operation_ops afs_fetch_status_operation;
1207
1208 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1209 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1210 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1211 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1212 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1213 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1214 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1215 struct kstat *, u32, unsigned int);
1216 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1217 extern void afs_evict_inode(struct inode *);
1218 extern int afs_drop_inode(struct inode *);
1219
1220 /*
1221 * main.c
1222 */
1223 extern struct workqueue_struct *afs_wq;
1224 extern int afs_net_id;
1225
afs_net(struct net * net)1226 static inline struct afs_net *afs_net(struct net *net)
1227 {
1228 return net_generic(net, afs_net_id);
1229 }
1230
afs_sb2net(struct super_block * sb)1231 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1232 {
1233 return afs_net(AFS_FS_S(sb)->net_ns);
1234 }
1235
afs_d2net(struct dentry * dentry)1236 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1237 {
1238 return afs_sb2net(dentry->d_sb);
1239 }
1240
afs_i2net(struct inode * inode)1241 static inline struct afs_net *afs_i2net(struct inode *inode)
1242 {
1243 return afs_sb2net(inode->i_sb);
1244 }
1245
afs_v2net(struct afs_vnode * vnode)1246 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1247 {
1248 return afs_i2net(&vnode->netfs.inode);
1249 }
1250
afs_sock2net(struct sock * sk)1251 static inline struct afs_net *afs_sock2net(struct sock *sk)
1252 {
1253 return net_generic(sock_net(sk), afs_net_id);
1254 }
1255
__afs_stat(atomic_t * s)1256 static inline void __afs_stat(atomic_t *s)
1257 {
1258 atomic_inc(s);
1259 }
1260
1261 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1262
1263 /*
1264 * misc.c
1265 */
1266 extern int afs_abort_to_error(u32);
1267 extern void afs_prioritise_error(struct afs_error *, int, u32);
1268
afs_op_nomem(struct afs_operation * op)1269 static inline void afs_op_nomem(struct afs_operation *op)
1270 {
1271 op->cumul_error.error = -ENOMEM;
1272 }
1273
afs_op_error(const struct afs_operation * op)1274 static inline int afs_op_error(const struct afs_operation *op)
1275 {
1276 return op->cumul_error.error;
1277 }
1278
afs_op_abort_code(const struct afs_operation * op)1279 static inline s32 afs_op_abort_code(const struct afs_operation *op)
1280 {
1281 return op->cumul_error.abort_code;
1282 }
1283
afs_op_set_error(struct afs_operation * op,int error)1284 static inline int afs_op_set_error(struct afs_operation *op, int error)
1285 {
1286 return op->cumul_error.error = error;
1287 }
1288
afs_op_accumulate_error(struct afs_operation * op,int error,s32 abort_code)1289 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1290 {
1291 afs_prioritise_error(&op->cumul_error, error, abort_code);
1292 }
1293
1294 /*
1295 * mntpt.c
1296 */
1297 extern const struct inode_operations afs_mntpt_inode_operations;
1298 extern const struct inode_operations afs_autocell_inode_operations;
1299 extern const struct file_operations afs_mntpt_file_operations;
1300
1301 extern struct vfsmount *afs_d_automount(struct path *);
1302 extern void afs_mntpt_kill_timer(void);
1303
1304 /*
1305 * proc.c
1306 */
1307 #ifdef CONFIG_PROC_FS
1308 extern int __net_init afs_proc_init(struct afs_net *);
1309 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1310 extern int afs_proc_cell_setup(struct afs_cell *);
1311 extern void afs_proc_cell_remove(struct afs_cell *);
1312 extern void afs_put_sysnames(struct afs_sysnames *);
1313 #else
afs_proc_init(struct afs_net * net)1314 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1315 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1316 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1317 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1318 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1319 #endif
1320
1321 /*
1322 * rotate.c
1323 */
1324 void afs_clear_server_states(struct afs_operation *op);
1325 extern bool afs_select_fileserver(struct afs_operation *);
1326 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1327
1328 /*
1329 * rxrpc.c
1330 */
1331 extern struct workqueue_struct *afs_async_calls;
1332
1333 extern int __net_init afs_open_socket(struct afs_net *);
1334 extern void __net_exit afs_close_socket(struct afs_net *);
1335 extern void afs_charge_preallocation(struct work_struct *);
1336 extern void afs_put_call(struct afs_call *);
1337 void afs_deferred_put_call(struct afs_call *call);
1338 void afs_make_call(struct afs_call *call, gfp_t gfp);
1339 void afs_wait_for_call_to_complete(struct afs_call *call);
1340 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1341 const struct afs_call_type *,
1342 size_t, size_t);
1343 extern void afs_flat_call_destructor(struct afs_call *);
1344 extern void afs_send_empty_reply(struct afs_call *);
1345 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1346 extern int afs_extract_data(struct afs_call *, bool);
1347 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1348
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1349 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1350 gfp_t gfp)
1351 {
1352 struct afs_addr_list *alist = op->estate->addresses;
1353
1354 op->call = call;
1355 op->type = call->type;
1356 call->op = op;
1357 call->key = op->key;
1358 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1359 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1360 call->service_id = op->server->service_id;
1361 afs_make_call(call, gfp);
1362 }
1363
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1364 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1365 {
1366 call->iov_len = size;
1367 call->kvec[0].iov_base = buf;
1368 call->kvec[0].iov_len = size;
1369 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1370 }
1371
afs_extract_to_tmp(struct afs_call * call)1372 static inline void afs_extract_to_tmp(struct afs_call *call)
1373 {
1374 call->iov_len = sizeof(call->tmp);
1375 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1376 }
1377
afs_extract_to_tmp64(struct afs_call * call)1378 static inline void afs_extract_to_tmp64(struct afs_call *call)
1379 {
1380 call->iov_len = sizeof(call->tmp64);
1381 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1382 }
1383
afs_extract_discard(struct afs_call * call,size_t size)1384 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1385 {
1386 call->iov_len = size;
1387 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1388 }
1389
afs_extract_to_buf(struct afs_call * call,size_t size)1390 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1391 {
1392 call->iov_len = size;
1393 afs_extract_begin(call, call->buffer, size);
1394 }
1395
afs_transfer_reply(struct afs_call * call)1396 static inline int afs_transfer_reply(struct afs_call *call)
1397 {
1398 return afs_extract_data(call, false);
1399 }
1400
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1401 static inline bool afs_check_call_state(struct afs_call *call,
1402 enum afs_call_state state)
1403 {
1404 return READ_ONCE(call->state) == state;
1405 }
1406
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1407 static inline bool afs_set_call_state(struct afs_call *call,
1408 enum afs_call_state from,
1409 enum afs_call_state to)
1410 {
1411 bool ok = false;
1412
1413 spin_lock_bh(&call->state_lock);
1414 if (call->state == from) {
1415 call->state = to;
1416 trace_afs_call_state(call, from, to, 0, 0);
1417 ok = true;
1418 }
1419 spin_unlock_bh(&call->state_lock);
1420 return ok;
1421 }
1422
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1423 static inline void afs_set_call_complete(struct afs_call *call,
1424 int error, u32 remote_abort)
1425 {
1426 enum afs_call_state state;
1427 bool ok = false;
1428
1429 spin_lock_bh(&call->state_lock);
1430 state = call->state;
1431 if (state != AFS_CALL_COMPLETE) {
1432 call->abort_code = remote_abort;
1433 call->error = error;
1434 call->state = AFS_CALL_COMPLETE;
1435 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1436 error, remote_abort);
1437 ok = true;
1438 }
1439 spin_unlock_bh(&call->state_lock);
1440 if (ok) {
1441 trace_afs_call_done(call);
1442
1443 /* Asynchronous calls have two refs to release - one from the alloc and
1444 * one queued with the work item - and we can't just deallocate the
1445 * call because the work item may be queued again.
1446 */
1447 if (call->drop_ref)
1448 afs_put_call(call);
1449 }
1450 }
1451
1452 /*
1453 * security.c
1454 */
1455 extern void afs_put_permits(struct afs_permits *);
1456 extern void afs_clear_permits(struct afs_vnode *);
1457 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1458 struct afs_status_cb *);
1459 extern struct key *afs_request_key(struct afs_cell *);
1460 extern struct key *afs_request_key_rcu(struct afs_cell *);
1461 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1462 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1463 extern void __exit afs_clean_up_permit_cache(void);
1464
1465 /*
1466 * server.c
1467 */
1468 extern spinlock_t afs_server_peer_lock;
1469
1470 extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *);
1471 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1472 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1473 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1474 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1475 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1476 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1477 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1478 extern void afs_manage_servers(struct work_struct *);
1479 extern void afs_servers_timer(struct timer_list *);
1480 extern void afs_fs_probe_timer(struct timer_list *);
1481 extern void __net_exit afs_purge_servers(struct afs_net *);
1482 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1483
afs_inc_servers_outstanding(struct afs_net * net)1484 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1485 {
1486 atomic_inc(&net->servers_outstanding);
1487 }
1488
afs_dec_servers_outstanding(struct afs_net * net)1489 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1490 {
1491 if (atomic_dec_and_test(&net->servers_outstanding))
1492 wake_up_var(&net->servers_outstanding);
1493 }
1494
afs_is_probing_server(struct afs_server * server)1495 static inline bool afs_is_probing_server(struct afs_server *server)
1496 {
1497 return list_empty(&server->probe_link);
1498 }
1499
1500 /*
1501 * server_list.c
1502 */
afs_get_serverlist(struct afs_server_list * slist)1503 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1504 {
1505 refcount_inc(&slist->usage);
1506 return slist;
1507 }
1508
1509 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1510 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1511 struct key *key,
1512 struct afs_vldb_entry *vldb);
1513 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1514 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1515 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1516 struct afs_server_list *old);
1517 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1518
1519 /*
1520 * super.c
1521 */
1522 extern int __init afs_fs_init(void);
1523 extern void afs_fs_exit(void);
1524
1525 /*
1526 * validation.c
1527 */
1528 bool afs_check_validity(const struct afs_vnode *vnode);
1529 int afs_update_volume_state(struct afs_operation *op);
1530 int afs_validate(struct afs_vnode *vnode, struct key *key);
1531
1532 /*
1533 * vlclient.c
1534 */
1535 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1536 const char *, int);
1537 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1538 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1539 struct afs_addr_list *alist,
1540 unsigned int addr_index,
1541 struct key *key,
1542 struct afs_vlserver *server,
1543 unsigned int server_index);
1544 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1545 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1546
1547 /*
1548 * vl_alias.c
1549 */
1550 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1551
1552 /*
1553 * vl_probe.c
1554 */
1555 extern void afs_vlserver_probe_result(struct afs_call *);
1556 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1557 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1558
1559 /*
1560 * vl_rotate.c
1561 */
1562 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1563 struct afs_cell *, struct key *);
1564 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1565 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1566 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1567
1568 /*
1569 * vlserver_list.c
1570 */
afs_get_vlserver(struct afs_vlserver * vlserver)1571 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1572 {
1573 refcount_inc(&vlserver->ref);
1574 return vlserver;
1575 }
1576
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1577 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1578 {
1579 if (vllist)
1580 refcount_inc(&vllist->ref);
1581 return vllist;
1582 }
1583
1584 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1585 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1586 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1587 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1588 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1589 const void *, size_t);
1590
1591 /*
1592 * volume.c
1593 */
1594 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1595 extern int afs_activate_volume(struct afs_volume *);
1596 extern void afs_deactivate_volume(struct afs_volume *);
1597 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1598 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1599 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1600 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1601
1602 /*
1603 * write.c
1604 */
1605 void afs_prepare_write(struct netfs_io_subrequest *subreq);
1606 void afs_issue_write(struct netfs_io_subrequest *subreq);
1607 void afs_begin_writeback(struct netfs_io_request *wreq);
1608 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1609 extern int afs_writepages(struct address_space *, struct writeback_control *);
1610 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1611 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1612 extern void afs_prune_wb_keys(struct afs_vnode *);
1613
1614 /*
1615 * xattr.c
1616 */
1617 extern const struct xattr_handler * const afs_xattr_handlers[];
1618
1619 /*
1620 * yfsclient.c
1621 */
1622 extern void yfs_fs_fetch_data(struct afs_operation *);
1623 extern void yfs_fs_create_file(struct afs_operation *);
1624 extern void yfs_fs_make_dir(struct afs_operation *);
1625 extern void yfs_fs_remove_file2(struct afs_operation *);
1626 extern void yfs_fs_remove_file(struct afs_operation *);
1627 extern void yfs_fs_remove_dir(struct afs_operation *);
1628 extern void yfs_fs_link(struct afs_operation *);
1629 extern void yfs_fs_symlink(struct afs_operation *);
1630 extern void yfs_fs_rename(struct afs_operation *);
1631 extern void yfs_fs_store_data(struct afs_operation *);
1632 extern void yfs_fs_setattr(struct afs_operation *);
1633 extern void yfs_fs_get_volume_status(struct afs_operation *);
1634 extern void yfs_fs_set_lock(struct afs_operation *);
1635 extern void yfs_fs_extend_lock(struct afs_operation *);
1636 extern void yfs_fs_release_lock(struct afs_operation *);
1637 extern void yfs_fs_fetch_status(struct afs_operation *);
1638 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1639
1640 struct yfs_acl {
1641 struct afs_acl *acl; /* Dir/file/symlink ACL */
1642 struct afs_acl *vol_acl; /* Whole volume ACL */
1643 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1644 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1645 unsigned int flags;
1646 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1647 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1648 };
1649
1650 extern void yfs_free_opaque_acl(struct yfs_acl *);
1651 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1652 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1653
1654 /*
1655 * Miscellaneous inline functions.
1656 */
AFS_FS_I(struct inode * inode)1657 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1658 {
1659 return container_of(inode, struct afs_vnode, netfs.inode);
1660 }
1661
AFS_VNODE_TO_I(struct afs_vnode * vnode)1662 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1663 {
1664 return &vnode->netfs.inode;
1665 }
1666
1667 /*
1668 * Note that a dentry got changed. We need to set d_fsdata to the data version
1669 * number derived from the result of the operation. It doesn't matter if
1670 * d_fsdata goes backwards as we'll just revalidate.
1671 */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1672 static inline void afs_update_dentry_version(struct afs_operation *op,
1673 struct afs_vnode_param *dir_vp,
1674 struct dentry *dentry)
1675 {
1676 if (!op->cumul_error.error)
1677 dentry->d_fsdata =
1678 (void *)(unsigned long)dir_vp->scb.status.data_version;
1679 }
1680
1681 /*
1682 * Set the file size and block count. Estimate the number of 512 bytes blocks
1683 * used, rounded up to nearest 1K for consistency with other AFS clients.
1684 */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1685 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1686 {
1687 i_size_write(&vnode->netfs.inode, size);
1688 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1689 }
1690
1691 /*
1692 * Check for a conflicting operation on a directory that we just unlinked from.
1693 * If someone managed to sneak a link or an unlink in on the file we just
1694 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1695 */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1696 static inline void afs_check_dir_conflict(struct afs_operation *op,
1697 struct afs_vnode_param *dvp)
1698 {
1699 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1700 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1701 }
1702
afs_io_error(struct afs_call * call,enum afs_io_error where)1703 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1704 {
1705 trace_afs_io_error(call->debug_id, -EIO, where);
1706 return -EIO;
1707 }
1708
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1709 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1710 {
1711 trace_afs_file_error(vnode, -EIO, where);
1712 return -EIO;
1713 }
1714
1715 /*****************************************************************************/
1716 /*
1717 * debug tracing
1718 */
1719 extern unsigned afs_debug;
1720
1721 #define dbgprintk(FMT,...) \
1722 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1723
1724 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1725 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1726 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1727
1728
1729 #if defined(__KDEBUG)
1730 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1731 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1732 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1733
1734 #elif defined(CONFIG_AFS_DEBUG)
1735 #define AFS_DEBUG_KENTER 0x01
1736 #define AFS_DEBUG_KLEAVE 0x02
1737 #define AFS_DEBUG_KDEBUG 0x04
1738
1739 #define _enter(FMT,...) \
1740 do { \
1741 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1742 kenter(FMT,##__VA_ARGS__); \
1743 } while (0)
1744
1745 #define _leave(FMT,...) \
1746 do { \
1747 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1748 kleave(FMT,##__VA_ARGS__); \
1749 } while (0)
1750
1751 #define _debug(FMT,...) \
1752 do { \
1753 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1754 kdebug(FMT,##__VA_ARGS__); \
1755 } while (0)
1756
1757 #else
1758 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1759 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1760 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1761 #endif
1762
1763 /*
1764 * debug assertion checking
1765 */
1766 #if 1 // defined(__KDEBUGALL)
1767
1768 #define ASSERT(X) \
1769 do { \
1770 if (unlikely(!(X))) { \
1771 printk(KERN_ERR "\n"); \
1772 printk(KERN_ERR "AFS: Assertion failed\n"); \
1773 BUG(); \
1774 } \
1775 } while(0)
1776
1777 #define ASSERTCMP(X, OP, Y) \
1778 do { \
1779 if (unlikely(!((X) OP (Y)))) { \
1780 printk(KERN_ERR "\n"); \
1781 printk(KERN_ERR "AFS: Assertion failed\n"); \
1782 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1783 (unsigned long)(X), (unsigned long)(Y)); \
1784 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1785 (unsigned long)(X), (unsigned long)(Y)); \
1786 BUG(); \
1787 } \
1788 } while(0)
1789
1790 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1791 do { \
1792 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1793 printk(KERN_ERR "\n"); \
1794 printk(KERN_ERR "AFS: Assertion failed\n"); \
1795 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1796 (unsigned long)(L), (unsigned long)(N), \
1797 (unsigned long)(H)); \
1798 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1799 (unsigned long)(L), (unsigned long)(N), \
1800 (unsigned long)(H)); \
1801 BUG(); \
1802 } \
1803 } while(0)
1804
1805 #define ASSERTIF(C, X) \
1806 do { \
1807 if (unlikely((C) && !(X))) { \
1808 printk(KERN_ERR "\n"); \
1809 printk(KERN_ERR "AFS: Assertion failed\n"); \
1810 BUG(); \
1811 } \
1812 } while(0)
1813
1814 #define ASSERTIFCMP(C, X, OP, Y) \
1815 do { \
1816 if (unlikely((C) && !((X) OP (Y)))) { \
1817 printk(KERN_ERR "\n"); \
1818 printk(KERN_ERR "AFS: Assertion failed\n"); \
1819 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1820 (unsigned long)(X), (unsigned long)(Y)); \
1821 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1822 (unsigned long)(X), (unsigned long)(Y)); \
1823 BUG(); \
1824 } \
1825 } while(0)
1826
1827 #else
1828
1829 #define ASSERT(X) \
1830 do { \
1831 } while(0)
1832
1833 #define ASSERTCMP(X, OP, Y) \
1834 do { \
1835 } while(0)
1836
1837 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1838 do { \
1839 } while(0)
1840
1841 #define ASSERTIF(C, X) \
1842 do { \
1843 } while(0)
1844
1845 #define ASSERTIFCMP(C, X, OP, Y) \
1846 do { \
1847 } while(0)
1848
1849 #endif /* __KDEBUGALL */
1850