1  // SPDX-License-Identifier: GPL-2.0
2  #include <linux/ceph/ceph_debug.h>
3  
4  #include <linux/module.h>
5  #include <linux/fs.h>
6  #include <linux/slab.h>
7  #include <linux/string.h>
8  #include <linux/uaccess.h>
9  #include <linux/kernel.h>
10  #include <linux/writeback.h>
11  #include <linux/vmalloc.h>
12  #include <linux/xattr.h>
13  #include <linux/posix_acl.h>
14  #include <linux/random.h>
15  #include <linux/sort.h>
16  #include <linux/iversion.h>
17  #include <linux/fscrypt.h>
18  
19  #include "super.h"
20  #include "mds_client.h"
21  #include "cache.h"
22  #include "crypto.h"
23  #include <linux/ceph/decode.h>
24  
25  /*
26   * Ceph inode operations
27   *
28   * Implement basic inode helpers (get, alloc) and inode ops (getattr,
29   * setattr, etc.), xattr helpers, and helpers for assimilating
30   * metadata returned by the MDS into our cache.
31   *
32   * Also define helpers for doing asynchronous writeback, invalidation,
33   * and truncation for the benefit of those who can't afford to block
34   * (typically because they are in the message handler path).
35   */
36  
37  static const struct inode_operations ceph_symlink_iops;
38  static const struct inode_operations ceph_encrypted_symlink_iops;
39  
40  static void ceph_inode_work(struct work_struct *work);
41  
42  /*
43   * find or create an inode, given the ceph ino number
44   */
ceph_set_ino_cb(struct inode * inode,void * data)45  static int ceph_set_ino_cb(struct inode *inode, void *data)
46  {
47  	struct ceph_inode_info *ci = ceph_inode(inode);
48  	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
49  
50  	ci->i_vino = *(struct ceph_vino *)data;
51  	inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
52  	inode_set_iversion_raw(inode, 0);
53  	percpu_counter_inc(&mdsc->metric.total_inodes);
54  
55  	return 0;
56  }
57  
58  /**
59   * ceph_new_inode - allocate a new inode in advance of an expected create
60   * @dir: parent directory for new inode
61   * @dentry: dentry that may eventually point to new inode
62   * @mode: mode of new inode
63   * @as_ctx: pointer to inherited security context
64   *
65   * Allocate a new inode in advance of an operation to create a new inode.
66   * This allocates the inode and sets up the acl_sec_ctx with appropriate
67   * info for the new inode.
68   *
69   * Returns a pointer to the new inode or an ERR_PTR.
70   */
ceph_new_inode(struct inode * dir,struct dentry * dentry,umode_t * mode,struct ceph_acl_sec_ctx * as_ctx)71  struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry,
72  			     umode_t *mode, struct ceph_acl_sec_ctx *as_ctx)
73  {
74  	int err;
75  	struct inode *inode;
76  
77  	inode = new_inode(dir->i_sb);
78  	if (!inode)
79  		return ERR_PTR(-ENOMEM);
80  
81  	inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
82  
83  	if (!S_ISLNK(*mode)) {
84  		err = ceph_pre_init_acls(dir, mode, as_ctx);
85  		if (err < 0)
86  			goto out_err;
87  	}
88  
89  	inode->i_state = 0;
90  	inode->i_mode = *mode;
91  
92  	err = ceph_security_init_secctx(dentry, *mode, as_ctx);
93  	if (err < 0)
94  		goto out_err;
95  
96  	/*
97  	 * We'll skip setting fscrypt context for snapshots, leaving that for
98  	 * the handle_reply().
99  	 */
100  	if (ceph_snap(dir) != CEPH_SNAPDIR) {
101  		err = ceph_fscrypt_prepare_context(dir, inode, as_ctx);
102  		if (err)
103  			goto out_err;
104  	}
105  
106  	return inode;
107  out_err:
108  	iput(inode);
109  	return ERR_PTR(err);
110  }
111  
ceph_as_ctx_to_req(struct ceph_mds_request * req,struct ceph_acl_sec_ctx * as_ctx)112  void ceph_as_ctx_to_req(struct ceph_mds_request *req,
113  			struct ceph_acl_sec_ctx *as_ctx)
114  {
115  	if (as_ctx->pagelist) {
116  		req->r_pagelist = as_ctx->pagelist;
117  		as_ctx->pagelist = NULL;
118  	}
119  	ceph_fscrypt_as_ctx_to_req(req, as_ctx);
120  }
121  
122  /**
123   * ceph_get_inode - find or create/hash a new inode
124   * @sb: superblock to search and allocate in
125   * @vino: vino to search for
126   * @newino: optional new inode to insert if one isn't found (may be NULL)
127   *
128   * Search for or insert a new inode into the hash for the given vino, and
129   * return a reference to it. If new is non-NULL, its reference is consumed.
130   */
ceph_get_inode(struct super_block * sb,struct ceph_vino vino,struct inode * newino)131  struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino,
132  			     struct inode *newino)
133  {
134  	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
135  	struct ceph_client *cl = mdsc->fsc->client;
136  	struct inode *inode;
137  
138  	if (ceph_vino_is_reserved(vino))
139  		return ERR_PTR(-EREMOTEIO);
140  
141  	if (newino) {
142  		inode = inode_insert5(newino, (unsigned long)vino.ino,
143  				      ceph_ino_compare, ceph_set_ino_cb, &vino);
144  		if (inode != newino)
145  			iput(newino);
146  	} else {
147  		inode = iget5_locked(sb, (unsigned long)vino.ino,
148  				     ceph_ino_compare, ceph_set_ino_cb, &vino);
149  	}
150  
151  	if (!inode) {
152  		doutc(cl, "no inode found for %llx.%llx\n", vino.ino, vino.snap);
153  		return ERR_PTR(-ENOMEM);
154  	}
155  
156  	doutc(cl, "on %llx=%llx.%llx got %p new %d\n",
157  	      ceph_present_inode(inode), ceph_vinop(inode), inode,
158  	      !!(inode->i_state & I_NEW));
159  	return inode;
160  }
161  
162  /*
163   * get/constuct snapdir inode for a given directory
164   */
ceph_get_snapdir(struct inode * parent)165  struct inode *ceph_get_snapdir(struct inode *parent)
166  {
167  	struct ceph_client *cl = ceph_inode_to_client(parent);
168  	struct ceph_vino vino = {
169  		.ino = ceph_ino(parent),
170  		.snap = CEPH_SNAPDIR,
171  	};
172  	struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL);
173  	struct ceph_inode_info *ci = ceph_inode(inode);
174  	int ret = -ENOTDIR;
175  
176  	if (IS_ERR(inode))
177  		return inode;
178  
179  	if (!S_ISDIR(parent->i_mode)) {
180  		pr_warn_once_client(cl, "bad snapdir parent type (mode=0%o)\n",
181  				    parent->i_mode);
182  		goto err;
183  	}
184  
185  	if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
186  		pr_warn_once_client(cl, "bad snapdir inode type (mode=0%o)\n",
187  				    inode->i_mode);
188  		goto err;
189  	}
190  
191  	inode->i_mode = parent->i_mode;
192  	inode->i_uid = parent->i_uid;
193  	inode->i_gid = parent->i_gid;
194  	inode_set_mtime_to_ts(inode, inode_get_mtime(parent));
195  	inode_set_ctime_to_ts(inode, inode_get_ctime(parent));
196  	inode_set_atime_to_ts(inode, inode_get_atime(parent));
197  	ci->i_rbytes = 0;
198  	ci->i_btime = ceph_inode(parent)->i_btime;
199  
200  #ifdef CONFIG_FS_ENCRYPTION
201  	/* if encrypted, just borrow fscrypt_auth from parent */
202  	if (IS_ENCRYPTED(parent)) {
203  		struct ceph_inode_info *pci = ceph_inode(parent);
204  
205  		ci->fscrypt_auth = kmemdup(pci->fscrypt_auth,
206  					   pci->fscrypt_auth_len,
207  					   GFP_KERNEL);
208  		if (ci->fscrypt_auth) {
209  			inode->i_flags |= S_ENCRYPTED;
210  			ci->fscrypt_auth_len = pci->fscrypt_auth_len;
211  		} else {
212  			doutc(cl, "Failed to alloc snapdir fscrypt_auth\n");
213  			ret = -ENOMEM;
214  			goto err;
215  		}
216  	}
217  #endif
218  	if (inode->i_state & I_NEW) {
219  		inode->i_op = &ceph_snapdir_iops;
220  		inode->i_fop = &ceph_snapdir_fops;
221  		ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
222  		unlock_new_inode(inode);
223  	}
224  
225  	return inode;
226  err:
227  	if ((inode->i_state & I_NEW))
228  		discard_new_inode(inode);
229  	else
230  		iput(inode);
231  	return ERR_PTR(ret);
232  }
233  
234  const struct inode_operations ceph_file_iops = {
235  	.permission = ceph_permission,
236  	.setattr = ceph_setattr,
237  	.getattr = ceph_getattr,
238  	.listxattr = ceph_listxattr,
239  	.get_inode_acl = ceph_get_acl,
240  	.set_acl = ceph_set_acl,
241  };
242  
243  
244  /*
245   * We use a 'frag tree' to keep track of the MDS's directory fragments
246   * for a given inode (usually there is just a single fragment).  We
247   * need to know when a child frag is delegated to a new MDS, or when
248   * it is flagged as replicated, so we can direct our requests
249   * accordingly.
250   */
251  
252  /*
253   * find/create a frag in the tree
254   */
__get_or_create_frag(struct ceph_inode_info * ci,u32 f)255  static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
256  						    u32 f)
257  {
258  	struct inode *inode = &ci->netfs.inode;
259  	struct ceph_client *cl = ceph_inode_to_client(inode);
260  	struct rb_node **p;
261  	struct rb_node *parent = NULL;
262  	struct ceph_inode_frag *frag;
263  	int c;
264  
265  	p = &ci->i_fragtree.rb_node;
266  	while (*p) {
267  		parent = *p;
268  		frag = rb_entry(parent, struct ceph_inode_frag, node);
269  		c = ceph_frag_compare(f, frag->frag);
270  		if (c < 0)
271  			p = &(*p)->rb_left;
272  		else if (c > 0)
273  			p = &(*p)->rb_right;
274  		else
275  			return frag;
276  	}
277  
278  	frag = kmalloc(sizeof(*frag), GFP_NOFS);
279  	if (!frag)
280  		return ERR_PTR(-ENOMEM);
281  
282  	frag->frag = f;
283  	frag->split_by = 0;
284  	frag->mds = -1;
285  	frag->ndist = 0;
286  
287  	rb_link_node(&frag->node, parent, p);
288  	rb_insert_color(&frag->node, &ci->i_fragtree);
289  
290  	doutc(cl, "added %p %llx.%llx frag %x\n", inode, ceph_vinop(inode), f);
291  	return frag;
292  }
293  
294  /*
295   * find a specific frag @f
296   */
__ceph_find_frag(struct ceph_inode_info * ci,u32 f)297  struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
298  {
299  	struct rb_node *n = ci->i_fragtree.rb_node;
300  
301  	while (n) {
302  		struct ceph_inode_frag *frag =
303  			rb_entry(n, struct ceph_inode_frag, node);
304  		int c = ceph_frag_compare(f, frag->frag);
305  		if (c < 0)
306  			n = n->rb_left;
307  		else if (c > 0)
308  			n = n->rb_right;
309  		else
310  			return frag;
311  	}
312  	return NULL;
313  }
314  
315  /*
316   * Choose frag containing the given value @v.  If @pfrag is
317   * specified, copy the frag delegation info to the caller if
318   * it is present.
319   */
__ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)320  static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
321  			      struct ceph_inode_frag *pfrag, int *found)
322  {
323  	struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
324  	u32 t = ceph_frag_make(0, 0);
325  	struct ceph_inode_frag *frag;
326  	unsigned nway, i;
327  	u32 n;
328  
329  	if (found)
330  		*found = 0;
331  
332  	while (1) {
333  		WARN_ON(!ceph_frag_contains_value(t, v));
334  		frag = __ceph_find_frag(ci, t);
335  		if (!frag)
336  			break; /* t is a leaf */
337  		if (frag->split_by == 0) {
338  			if (pfrag)
339  				memcpy(pfrag, frag, sizeof(*pfrag));
340  			if (found)
341  				*found = 1;
342  			break;
343  		}
344  
345  		/* choose child */
346  		nway = 1 << frag->split_by;
347  		doutc(cl, "frag(%x) %x splits by %d (%d ways)\n", v, t,
348  		      frag->split_by, nway);
349  		for (i = 0; i < nway; i++) {
350  			n = ceph_frag_make_child(t, frag->split_by, i);
351  			if (ceph_frag_contains_value(n, v)) {
352  				t = n;
353  				break;
354  			}
355  		}
356  		BUG_ON(i == nway);
357  	}
358  	doutc(cl, "frag(%x) = %x\n", v, t);
359  
360  	return t;
361  }
362  
ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)363  u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
364  		     struct ceph_inode_frag *pfrag, int *found)
365  {
366  	u32 ret;
367  	mutex_lock(&ci->i_fragtree_mutex);
368  	ret = __ceph_choose_frag(ci, v, pfrag, found);
369  	mutex_unlock(&ci->i_fragtree_mutex);
370  	return ret;
371  }
372  
373  /*
374   * Process dirfrag (delegation) info from the mds.  Include leaf
375   * fragment in tree ONLY if ndist > 0.  Otherwise, only
376   * branches/splits are included in i_fragtree)
377   */
ceph_fill_dirfrag(struct inode * inode,struct ceph_mds_reply_dirfrag * dirinfo)378  static int ceph_fill_dirfrag(struct inode *inode,
379  			     struct ceph_mds_reply_dirfrag *dirinfo)
380  {
381  	struct ceph_inode_info *ci = ceph_inode(inode);
382  	struct ceph_client *cl = ceph_inode_to_client(inode);
383  	struct ceph_inode_frag *frag;
384  	u32 id = le32_to_cpu(dirinfo->frag);
385  	int mds = le32_to_cpu(dirinfo->auth);
386  	int ndist = le32_to_cpu(dirinfo->ndist);
387  	int diri_auth = -1;
388  	int i;
389  	int err = 0;
390  
391  	spin_lock(&ci->i_ceph_lock);
392  	if (ci->i_auth_cap)
393  		diri_auth = ci->i_auth_cap->mds;
394  	spin_unlock(&ci->i_ceph_lock);
395  
396  	if (mds == -1) /* CDIR_AUTH_PARENT */
397  		mds = diri_auth;
398  
399  	mutex_lock(&ci->i_fragtree_mutex);
400  	if (ndist == 0 && mds == diri_auth) {
401  		/* no delegation info needed. */
402  		frag = __ceph_find_frag(ci, id);
403  		if (!frag)
404  			goto out;
405  		if (frag->split_by == 0) {
406  			/* tree leaf, remove */
407  			doutc(cl, "removed %p %llx.%llx frag %x (no ref)\n",
408  			      inode, ceph_vinop(inode), id);
409  			rb_erase(&frag->node, &ci->i_fragtree);
410  			kfree(frag);
411  		} else {
412  			/* tree branch, keep and clear */
413  			doutc(cl, "cleared %p %llx.%llx frag %x referral\n",
414  			      inode, ceph_vinop(inode), id);
415  			frag->mds = -1;
416  			frag->ndist = 0;
417  		}
418  		goto out;
419  	}
420  
421  
422  	/* find/add this frag to store mds delegation info */
423  	frag = __get_or_create_frag(ci, id);
424  	if (IS_ERR(frag)) {
425  		/* this is not the end of the world; we can continue
426  		   with bad/inaccurate delegation info */
427  		pr_err_client(cl, "ENOMEM on mds ref %p %llx.%llx fg %x\n",
428  			      inode, ceph_vinop(inode),
429  			      le32_to_cpu(dirinfo->frag));
430  		err = -ENOMEM;
431  		goto out;
432  	}
433  
434  	frag->mds = mds;
435  	frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
436  	for (i = 0; i < frag->ndist; i++)
437  		frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
438  	doutc(cl, "%p %llx.%llx frag %x ndist=%d\n", inode,
439  	      ceph_vinop(inode), frag->frag, frag->ndist);
440  
441  out:
442  	mutex_unlock(&ci->i_fragtree_mutex);
443  	return err;
444  }
445  
frag_tree_split_cmp(const void * l,const void * r)446  static int frag_tree_split_cmp(const void *l, const void *r)
447  {
448  	struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
449  	struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
450  	return ceph_frag_compare(le32_to_cpu(ls->frag),
451  				 le32_to_cpu(rs->frag));
452  }
453  
is_frag_child(u32 f,struct ceph_inode_frag * frag)454  static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
455  {
456  	if (!frag)
457  		return f == ceph_frag_make(0, 0);
458  	if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
459  		return false;
460  	return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
461  }
462  
ceph_fill_fragtree(struct inode * inode,struct ceph_frag_tree_head * fragtree,struct ceph_mds_reply_dirfrag * dirinfo)463  static int ceph_fill_fragtree(struct inode *inode,
464  			      struct ceph_frag_tree_head *fragtree,
465  			      struct ceph_mds_reply_dirfrag *dirinfo)
466  {
467  	struct ceph_client *cl = ceph_inode_to_client(inode);
468  	struct ceph_inode_info *ci = ceph_inode(inode);
469  	struct ceph_inode_frag *frag, *prev_frag = NULL;
470  	struct rb_node *rb_node;
471  	unsigned i, split_by, nsplits;
472  	u32 id;
473  	bool update = false;
474  
475  	mutex_lock(&ci->i_fragtree_mutex);
476  	nsplits = le32_to_cpu(fragtree->nsplits);
477  	if (nsplits != ci->i_fragtree_nsplits) {
478  		update = true;
479  	} else if (nsplits) {
480  		i = get_random_u32_below(nsplits);
481  		id = le32_to_cpu(fragtree->splits[i].frag);
482  		if (!__ceph_find_frag(ci, id))
483  			update = true;
484  	} else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
485  		rb_node = rb_first(&ci->i_fragtree);
486  		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
487  		if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
488  			update = true;
489  	}
490  	if (!update && dirinfo) {
491  		id = le32_to_cpu(dirinfo->frag);
492  		if (id != __ceph_choose_frag(ci, id, NULL, NULL))
493  			update = true;
494  	}
495  	if (!update)
496  		goto out_unlock;
497  
498  	if (nsplits > 1) {
499  		sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
500  		     frag_tree_split_cmp, NULL);
501  	}
502  
503  	doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
504  	rb_node = rb_first(&ci->i_fragtree);
505  	for (i = 0; i < nsplits; i++) {
506  		id = le32_to_cpu(fragtree->splits[i].frag);
507  		split_by = le32_to_cpu(fragtree->splits[i].by);
508  		if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
509  			pr_err_client(cl, "%p %llx.%llx invalid split %d/%u, "
510  			       "frag %x split by %d\n", inode,
511  			       ceph_vinop(inode), i, nsplits, id, split_by);
512  			continue;
513  		}
514  		frag = NULL;
515  		while (rb_node) {
516  			frag = rb_entry(rb_node, struct ceph_inode_frag, node);
517  			if (ceph_frag_compare(frag->frag, id) >= 0) {
518  				if (frag->frag != id)
519  					frag = NULL;
520  				else
521  					rb_node = rb_next(rb_node);
522  				break;
523  			}
524  			rb_node = rb_next(rb_node);
525  			/* delete stale split/leaf node */
526  			if (frag->split_by > 0 ||
527  			    !is_frag_child(frag->frag, prev_frag)) {
528  				rb_erase(&frag->node, &ci->i_fragtree);
529  				if (frag->split_by > 0)
530  					ci->i_fragtree_nsplits--;
531  				kfree(frag);
532  			}
533  			frag = NULL;
534  		}
535  		if (!frag) {
536  			frag = __get_or_create_frag(ci, id);
537  			if (IS_ERR(frag))
538  				continue;
539  		}
540  		if (frag->split_by == 0)
541  			ci->i_fragtree_nsplits++;
542  		frag->split_by = split_by;
543  		doutc(cl, " frag %x split by %d\n", frag->frag, frag->split_by);
544  		prev_frag = frag;
545  	}
546  	while (rb_node) {
547  		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
548  		rb_node = rb_next(rb_node);
549  		/* delete stale split/leaf node */
550  		if (frag->split_by > 0 ||
551  		    !is_frag_child(frag->frag, prev_frag)) {
552  			rb_erase(&frag->node, &ci->i_fragtree);
553  			if (frag->split_by > 0)
554  				ci->i_fragtree_nsplits--;
555  			kfree(frag);
556  		}
557  	}
558  out_unlock:
559  	mutex_unlock(&ci->i_fragtree_mutex);
560  	return 0;
561  }
562  
563  /*
564   * initialize a newly allocated inode.
565   */
ceph_alloc_inode(struct super_block * sb)566  struct inode *ceph_alloc_inode(struct super_block *sb)
567  {
568  	struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
569  	struct ceph_inode_info *ci;
570  	int i;
571  
572  	ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
573  	if (!ci)
574  		return NULL;
575  
576  	doutc(fsc->client, "%p\n", &ci->netfs.inode);
577  
578  	/* Set parameters for the netfs library */
579  	netfs_inode_init(&ci->netfs, &ceph_netfs_ops, false);
580  
581  	spin_lock_init(&ci->i_ceph_lock);
582  
583  	ci->i_version = 0;
584  	ci->i_inline_version = 0;
585  	ci->i_time_warp_seq = 0;
586  	ci->i_ceph_flags = 0;
587  	atomic64_set(&ci->i_ordered_count, 1);
588  	atomic64_set(&ci->i_release_count, 1);
589  	atomic64_set(&ci->i_complete_seq[0], 0);
590  	atomic64_set(&ci->i_complete_seq[1], 0);
591  	ci->i_symlink = NULL;
592  
593  	ci->i_max_bytes = 0;
594  	ci->i_max_files = 0;
595  
596  	memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
597  	memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
598  	RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
599  
600  	ci->i_fragtree = RB_ROOT;
601  	mutex_init(&ci->i_fragtree_mutex);
602  
603  	ci->i_xattrs.blob = NULL;
604  	ci->i_xattrs.prealloc_blob = NULL;
605  	ci->i_xattrs.dirty = false;
606  	ci->i_xattrs.index = RB_ROOT;
607  	ci->i_xattrs.count = 0;
608  	ci->i_xattrs.names_size = 0;
609  	ci->i_xattrs.vals_size = 0;
610  	ci->i_xattrs.version = 0;
611  	ci->i_xattrs.index_version = 0;
612  
613  	ci->i_caps = RB_ROOT;
614  	ci->i_auth_cap = NULL;
615  	ci->i_dirty_caps = 0;
616  	ci->i_flushing_caps = 0;
617  	INIT_LIST_HEAD(&ci->i_dirty_item);
618  	INIT_LIST_HEAD(&ci->i_flushing_item);
619  	ci->i_prealloc_cap_flush = NULL;
620  	INIT_LIST_HEAD(&ci->i_cap_flush_list);
621  	init_waitqueue_head(&ci->i_cap_wq);
622  	ci->i_hold_caps_max = 0;
623  	INIT_LIST_HEAD(&ci->i_cap_delay_list);
624  	INIT_LIST_HEAD(&ci->i_cap_snaps);
625  	ci->i_head_snapc = NULL;
626  	ci->i_snap_caps = 0;
627  
628  	ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
629  	for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
630  		ci->i_nr_by_mode[i] = 0;
631  
632  	mutex_init(&ci->i_truncate_mutex);
633  	ci->i_truncate_seq = 0;
634  	ci->i_truncate_size = 0;
635  	ci->i_truncate_pending = 0;
636  	ci->i_truncate_pagecache_size = 0;
637  
638  	ci->i_max_size = 0;
639  	ci->i_reported_size = 0;
640  	ci->i_wanted_max_size = 0;
641  	ci->i_requested_max_size = 0;
642  
643  	ci->i_pin_ref = 0;
644  	ci->i_rd_ref = 0;
645  	ci->i_rdcache_ref = 0;
646  	ci->i_wr_ref = 0;
647  	ci->i_wb_ref = 0;
648  	ci->i_fx_ref = 0;
649  	ci->i_wrbuffer_ref = 0;
650  	ci->i_wrbuffer_ref_head = 0;
651  	atomic_set(&ci->i_filelock_ref, 0);
652  	atomic_set(&ci->i_shared_gen, 1);
653  	ci->i_rdcache_gen = 0;
654  	ci->i_rdcache_revoking = 0;
655  
656  	INIT_LIST_HEAD(&ci->i_unsafe_dirops);
657  	INIT_LIST_HEAD(&ci->i_unsafe_iops);
658  	spin_lock_init(&ci->i_unsafe_lock);
659  
660  	ci->i_snap_realm = NULL;
661  	INIT_LIST_HEAD(&ci->i_snap_realm_item);
662  	INIT_LIST_HEAD(&ci->i_snap_flush_item);
663  
664  	INIT_WORK(&ci->i_work, ceph_inode_work);
665  	ci->i_work_mask = 0;
666  	memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
667  #ifdef CONFIG_FS_ENCRYPTION
668  	ci->fscrypt_auth = NULL;
669  	ci->fscrypt_auth_len = 0;
670  #endif
671  	return &ci->netfs.inode;
672  }
673  
ceph_free_inode(struct inode * inode)674  void ceph_free_inode(struct inode *inode)
675  {
676  	struct ceph_inode_info *ci = ceph_inode(inode);
677  
678  	kfree(ci->i_symlink);
679  #ifdef CONFIG_FS_ENCRYPTION
680  	kfree(ci->fscrypt_auth);
681  #endif
682  	fscrypt_free_inode(inode);
683  	kmem_cache_free(ceph_inode_cachep, ci);
684  }
685  
ceph_evict_inode(struct inode * inode)686  void ceph_evict_inode(struct inode *inode)
687  {
688  	struct ceph_inode_info *ci = ceph_inode(inode);
689  	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
690  	struct ceph_client *cl = ceph_inode_to_client(inode);
691  	struct ceph_inode_frag *frag;
692  	struct rb_node *n;
693  
694  	doutc(cl, "%p ino %llx.%llx\n", inode, ceph_vinop(inode));
695  
696  	percpu_counter_dec(&mdsc->metric.total_inodes);
697  
698  	netfs_wait_for_outstanding_io(inode);
699  	truncate_inode_pages_final(&inode->i_data);
700  	if (inode->i_state & I_PINNING_NETFS_WB)
701  		ceph_fscache_unuse_cookie(inode, true);
702  	clear_inode(inode);
703  
704  	ceph_fscache_unregister_inode_cookie(ci);
705  	fscrypt_put_encryption_info(inode);
706  
707  	__ceph_remove_caps(ci);
708  
709  	if (__ceph_has_quota(ci, QUOTA_GET_ANY))
710  		ceph_adjust_quota_realms_count(inode, false);
711  
712  	/*
713  	 * we may still have a snap_realm reference if there are stray
714  	 * caps in i_snap_caps.
715  	 */
716  	if (ci->i_snap_realm) {
717  		if (ceph_snap(inode) == CEPH_NOSNAP) {
718  			doutc(cl, " dropping residual ref to snap realm %p\n",
719  			      ci->i_snap_realm);
720  			ceph_change_snap_realm(inode, NULL);
721  		} else {
722  			ceph_put_snapid_map(mdsc, ci->i_snapid_map);
723  			ci->i_snap_realm = NULL;
724  		}
725  	}
726  
727  	while ((n = rb_first(&ci->i_fragtree)) != NULL) {
728  		frag = rb_entry(n, struct ceph_inode_frag, node);
729  		rb_erase(n, &ci->i_fragtree);
730  		kfree(frag);
731  	}
732  	ci->i_fragtree_nsplits = 0;
733  
734  	__ceph_destroy_xattrs(ci);
735  	if (ci->i_xattrs.blob)
736  		ceph_buffer_put(ci->i_xattrs.blob);
737  	if (ci->i_xattrs.prealloc_blob)
738  		ceph_buffer_put(ci->i_xattrs.prealloc_blob);
739  
740  	ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
741  	ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
742  }
743  
calc_inode_blocks(u64 size)744  static inline blkcnt_t calc_inode_blocks(u64 size)
745  {
746  	return (size + (1<<9) - 1) >> 9;
747  }
748  
749  /*
750   * Helpers to fill in size, ctime, mtime, and atime.  We have to be
751   * careful because either the client or MDS may have more up to date
752   * info, depending on which capabilities are held, and whether
753   * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
754   * and size are monotonically increasing, except when utimes() or
755   * truncate() increments the corresponding _seq values.)
756   */
ceph_fill_file_size(struct inode * inode,int issued,u32 truncate_seq,u64 truncate_size,u64 size)757  int ceph_fill_file_size(struct inode *inode, int issued,
758  			u32 truncate_seq, u64 truncate_size, u64 size)
759  {
760  	struct ceph_client *cl = ceph_inode_to_client(inode);
761  	struct ceph_inode_info *ci = ceph_inode(inode);
762  	int queue_trunc = 0;
763  	loff_t isize = i_size_read(inode);
764  
765  	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
766  	    (truncate_seq == ci->i_truncate_seq && size > isize)) {
767  		doutc(cl, "size %lld -> %llu\n", isize, size);
768  		if (size > 0 && S_ISDIR(inode->i_mode)) {
769  			pr_err_client(cl, "non-zero size for directory\n");
770  			size = 0;
771  		}
772  		i_size_write(inode, size);
773  		inode->i_blocks = calc_inode_blocks(size);
774  		/*
775  		 * If we're expanding, then we should be able to just update
776  		 * the existing cookie.
777  		 */
778  		if (size > isize)
779  			ceph_fscache_update(inode);
780  		ci->i_reported_size = size;
781  		if (truncate_seq != ci->i_truncate_seq) {
782  			doutc(cl, "truncate_seq %u -> %u\n",
783  			      ci->i_truncate_seq, truncate_seq);
784  			ci->i_truncate_seq = truncate_seq;
785  
786  			/* the MDS should have revoked these caps */
787  			WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
788  					       CEPH_CAP_FILE_LAZYIO));
789  			/*
790  			 * If we hold relevant caps, or in the case where we're
791  			 * not the only client referencing this file and we
792  			 * don't hold those caps, then we need to check whether
793  			 * the file is either opened or mmaped
794  			 */
795  			if ((issued & (CEPH_CAP_FILE_CACHE|
796  				       CEPH_CAP_FILE_BUFFER)) ||
797  			    mapping_mapped(inode->i_mapping) ||
798  			    __ceph_is_file_opened(ci)) {
799  				ci->i_truncate_pending++;
800  				queue_trunc = 1;
801  			}
802  		}
803  	}
804  
805  	/*
806  	 * It's possible that the new sizes of the two consecutive
807  	 * size truncations will be in the same fscrypt last block,
808  	 * and we need to truncate the corresponding page caches
809  	 * anyway.
810  	 */
811  	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) {
812  		doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n",
813  		      ci->i_truncate_size, truncate_size,
814  		      !!IS_ENCRYPTED(inode));
815  
816  		ci->i_truncate_size = truncate_size;
817  
818  		if (IS_ENCRYPTED(inode)) {
819  			doutc(cl, "truncate_pagecache_size %lld -> %llu\n",
820  			      ci->i_truncate_pagecache_size, size);
821  			ci->i_truncate_pagecache_size = size;
822  		} else {
823  			ci->i_truncate_pagecache_size = truncate_size;
824  		}
825  	}
826  	return queue_trunc;
827  }
828  
ceph_fill_file_time(struct inode * inode,int issued,u64 time_warp_seq,struct timespec64 * ctime,struct timespec64 * mtime,struct timespec64 * atime)829  void ceph_fill_file_time(struct inode *inode, int issued,
830  			 u64 time_warp_seq, struct timespec64 *ctime,
831  			 struct timespec64 *mtime, struct timespec64 *atime)
832  {
833  	struct ceph_client *cl = ceph_inode_to_client(inode);
834  	struct ceph_inode_info *ci = ceph_inode(inode);
835  	struct timespec64 ictime = inode_get_ctime(inode);
836  	int warn = 0;
837  
838  	if (issued & (CEPH_CAP_FILE_EXCL|
839  		      CEPH_CAP_FILE_WR|
840  		      CEPH_CAP_FILE_BUFFER|
841  		      CEPH_CAP_AUTH_EXCL|
842  		      CEPH_CAP_XATTR_EXCL)) {
843  		if (ci->i_version == 0 ||
844  		    timespec64_compare(ctime, &ictime) > 0) {
845  			doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
846  			     ictime.tv_sec, ictime.tv_nsec,
847  			     ctime->tv_sec, ctime->tv_nsec);
848  			inode_set_ctime_to_ts(inode, *ctime);
849  		}
850  		if (ci->i_version == 0 ||
851  		    ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
852  			/* the MDS did a utimes() */
853  			doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n",
854  			     inode_get_mtime_sec(inode),
855  			     inode_get_mtime_nsec(inode),
856  			     mtime->tv_sec, mtime->tv_nsec,
857  			     ci->i_time_warp_seq, (int)time_warp_seq);
858  
859  			inode_set_mtime_to_ts(inode, *mtime);
860  			inode_set_atime_to_ts(inode, *atime);
861  			ci->i_time_warp_seq = time_warp_seq;
862  		} else if (time_warp_seq == ci->i_time_warp_seq) {
863  			struct timespec64	ts;
864  
865  			/* nobody did utimes(); take the max */
866  			ts = inode_get_mtime(inode);
867  			if (timespec64_compare(mtime, &ts) > 0) {
868  				doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
869  				     ts.tv_sec, ts.tv_nsec,
870  				     mtime->tv_sec, mtime->tv_nsec);
871  				inode_set_mtime_to_ts(inode, *mtime);
872  			}
873  			ts = inode_get_atime(inode);
874  			if (timespec64_compare(atime, &ts) > 0) {
875  				doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
876  				     ts.tv_sec, ts.tv_nsec,
877  				     atime->tv_sec, atime->tv_nsec);
878  				inode_set_atime_to_ts(inode, *atime);
879  			}
880  		} else if (issued & CEPH_CAP_FILE_EXCL) {
881  			/* we did a utimes(); ignore mds values */
882  		} else {
883  			warn = 1;
884  		}
885  	} else {
886  		/* we have no write|excl caps; whatever the MDS says is true */
887  		if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
888  			inode_set_ctime_to_ts(inode, *ctime);
889  			inode_set_mtime_to_ts(inode, *mtime);
890  			inode_set_atime_to_ts(inode, *atime);
891  			ci->i_time_warp_seq = time_warp_seq;
892  		} else {
893  			warn = 1;
894  		}
895  	}
896  	if (warn) /* time_warp_seq shouldn't go backwards */
897  		doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
898  		      time_warp_seq, ci->i_time_warp_seq);
899  }
900  
901  #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
decode_encrypted_symlink(struct ceph_mds_client * mdsc,const char * encsym,int enclen,u8 ** decsym)902  static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
903  				    const char *encsym,
904  				    int enclen, u8 **decsym)
905  {
906  	struct ceph_client *cl = mdsc->fsc->client;
907  	int declen;
908  	u8 *sym;
909  
910  	sym = kmalloc(enclen + 1, GFP_NOFS);
911  	if (!sym)
912  		return -ENOMEM;
913  
914  	declen = ceph_base64_decode(encsym, enclen, sym);
915  	if (declen < 0) {
916  		pr_err_client(cl,
917  			"can't decode symlink (%d). Content: %.*s\n",
918  			declen, enclen, encsym);
919  		kfree(sym);
920  		return -EIO;
921  	}
922  	sym[declen + 1] = '\0';
923  	*decsym = sym;
924  	return declen;
925  }
926  #else
decode_encrypted_symlink(struct ceph_mds_client * mdsc,const char * encsym,int symlen,u8 ** decsym)927  static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
928  				    const char *encsym,
929  				    int symlen, u8 **decsym)
930  {
931  	return -EOPNOTSUPP;
932  }
933  #endif
934  
935  /*
936   * Populate an inode based on info from mds.  May be called on new or
937   * existing inodes.
938   */
ceph_fill_inode(struct inode * inode,struct page * locked_page,struct ceph_mds_reply_info_in * iinfo,struct ceph_mds_reply_dirfrag * dirinfo,struct ceph_mds_session * session,int cap_fmode,struct ceph_cap_reservation * caps_reservation)939  int ceph_fill_inode(struct inode *inode, struct page *locked_page,
940  		    struct ceph_mds_reply_info_in *iinfo,
941  		    struct ceph_mds_reply_dirfrag *dirinfo,
942  		    struct ceph_mds_session *session, int cap_fmode,
943  		    struct ceph_cap_reservation *caps_reservation)
944  {
945  	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
946  	struct ceph_client *cl = mdsc->fsc->client;
947  	struct ceph_mds_reply_inode *info = iinfo->in;
948  	struct ceph_inode_info *ci = ceph_inode(inode);
949  	int issued, new_issued, info_caps;
950  	struct timespec64 mtime, atime, ctime;
951  	struct ceph_buffer *xattr_blob = NULL;
952  	struct ceph_buffer *old_blob = NULL;
953  	struct ceph_string *pool_ns = NULL;
954  	struct ceph_cap *new_cap = NULL;
955  	int err = 0;
956  	bool wake = false;
957  	bool queue_trunc = false;
958  	bool new_version = false;
959  	bool fill_inline = false;
960  	umode_t mode = le32_to_cpu(info->mode);
961  	dev_t rdev = le32_to_cpu(info->rdev);
962  
963  	lockdep_assert_held(&mdsc->snap_rwsem);
964  
965  	doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
966  	      le64_to_cpu(info->version), ci->i_version);
967  
968  	/* Once I_NEW is cleared, we can't change type or dev numbers */
969  	if (inode->i_state & I_NEW) {
970  		inode->i_mode = mode;
971  	} else {
972  		if (inode_wrong_type(inode, mode)) {
973  			pr_warn_once_client(cl,
974  				"inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
975  				ceph_vinop(inode), inode->i_mode, mode);
976  			return -ESTALE;
977  		}
978  
979  		if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
980  			pr_warn_once_client(cl,
981  				"dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
982  				ceph_vinop(inode), MAJOR(inode->i_rdev),
983  				MINOR(inode->i_rdev), MAJOR(rdev),
984  				MINOR(rdev));
985  			return -ESTALE;
986  		}
987  	}
988  
989  	info_caps = le32_to_cpu(info->cap.caps);
990  
991  	/* prealloc new cap struct */
992  	if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
993  		new_cap = ceph_get_cap(mdsc, caps_reservation);
994  		if (!new_cap)
995  			return -ENOMEM;
996  	}
997  
998  	/*
999  	 * prealloc xattr data, if it looks like we'll need it.  only
1000  	 * if len > 4 (meaning there are actually xattrs; the first 4
1001  	 * bytes are the xattr count).
1002  	 */
1003  	if (iinfo->xattr_len > 4) {
1004  		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
1005  		if (!xattr_blob)
1006  			pr_err_client(cl, "ENOMEM xattr blob %d bytes\n",
1007  				      iinfo->xattr_len);
1008  	}
1009  
1010  	if (iinfo->pool_ns_len > 0)
1011  		pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
1012  						     iinfo->pool_ns_len);
1013  
1014  	if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
1015  		ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
1016  
1017  	spin_lock(&ci->i_ceph_lock);
1018  
1019  	/*
1020  	 * provided version will be odd if inode value is projected,
1021  	 * even if stable.  skip the update if we have newer stable
1022  	 * info (ours>=theirs, e.g. due to racing mds replies), unless
1023  	 * we are getting projected (unstable) info (in which case the
1024  	 * version is odd, and we want ours>theirs).
1025  	 *   us   them
1026  	 *   2    2     skip
1027  	 *   3    2     skip
1028  	 *   3    3     update
1029  	 */
1030  	if (ci->i_version == 0 ||
1031  	    ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1032  	     le64_to_cpu(info->version) > (ci->i_version & ~1)))
1033  		new_version = true;
1034  
1035  	/* Update change_attribute */
1036  	inode_set_max_iversion_raw(inode, iinfo->change_attr);
1037  
1038  	__ceph_caps_issued(ci, &issued);
1039  	issued |= __ceph_caps_dirty(ci);
1040  	new_issued = ~issued & info_caps;
1041  
1042  	__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
1043  
1044  #ifdef CONFIG_FS_ENCRYPTION
1045  	if (iinfo->fscrypt_auth_len &&
1046  	    ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
1047  		kfree(ci->fscrypt_auth);
1048  		ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
1049  		ci->fscrypt_auth = iinfo->fscrypt_auth;
1050  		iinfo->fscrypt_auth = NULL;
1051  		iinfo->fscrypt_auth_len = 0;
1052  		inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
1053  	}
1054  #endif
1055  
1056  	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
1057  	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
1058  		inode->i_mode = mode;
1059  		inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
1060  		inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
1061  		doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
1062  		      ceph_vinop(inode), inode->i_mode,
1063  		      from_kuid(&init_user_ns, inode->i_uid),
1064  		      from_kgid(&init_user_ns, inode->i_gid));
1065  		ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
1066  		ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
1067  	}
1068  
1069  	/* directories have fl_stripe_unit set to zero */
1070  	if (IS_ENCRYPTED(inode))
1071  		inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
1072  	else if (le32_to_cpu(info->layout.fl_stripe_unit))
1073  		inode->i_blkbits =
1074  			fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
1075  	else
1076  		inode->i_blkbits = CEPH_BLOCK_SHIFT;
1077  
1078  	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
1079  	    (issued & CEPH_CAP_LINK_EXCL) == 0)
1080  		set_nlink(inode, le32_to_cpu(info->nlink));
1081  
1082  	if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
1083  		/* be careful with mtime, atime, size */
1084  		ceph_decode_timespec64(&atime, &info->atime);
1085  		ceph_decode_timespec64(&mtime, &info->mtime);
1086  		ceph_decode_timespec64(&ctime, &info->ctime);
1087  		ceph_fill_file_time(inode, issued,
1088  				le32_to_cpu(info->time_warp_seq),
1089  				&ctime, &mtime, &atime);
1090  	}
1091  
1092  	if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
1093  		ci->i_files = le64_to_cpu(info->files);
1094  		ci->i_subdirs = le64_to_cpu(info->subdirs);
1095  	}
1096  
1097  	if (new_version ||
1098  	    (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
1099  		u64 size = le64_to_cpu(info->size);
1100  		s64 old_pool = ci->i_layout.pool_id;
1101  		struct ceph_string *old_ns;
1102  
1103  		ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
1104  		old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
1105  					lockdep_is_held(&ci->i_ceph_lock));
1106  		rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
1107  
1108  		if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
1109  			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
1110  
1111  		pool_ns = old_ns;
1112  
1113  		if (IS_ENCRYPTED(inode) && size &&
1114  		    iinfo->fscrypt_file_len == sizeof(__le64)) {
1115  			u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
1116  
1117  			if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
1118  				size = fsize;
1119  			} else {
1120  				pr_warn_client(cl,
1121  					"fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
1122  					info->size, size);
1123  			}
1124  		}
1125  
1126  		queue_trunc = ceph_fill_file_size(inode, issued,
1127  					le32_to_cpu(info->truncate_seq),
1128  					le64_to_cpu(info->truncate_size),
1129  					size);
1130  		/* only update max_size on auth cap */
1131  		if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1132  		    ci->i_max_size != le64_to_cpu(info->max_size)) {
1133  			doutc(cl, "max_size %lld -> %llu\n",
1134  			    ci->i_max_size, le64_to_cpu(info->max_size));
1135  			ci->i_max_size = le64_to_cpu(info->max_size);
1136  		}
1137  	}
1138  
1139  	/* layout and rstat are not tracked by capability, update them if
1140  	 * the inode info is from auth mds */
1141  	if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
1142  		if (S_ISDIR(inode->i_mode)) {
1143  			ci->i_dir_layout = iinfo->dir_layout;
1144  			ci->i_rbytes = le64_to_cpu(info->rbytes);
1145  			ci->i_rfiles = le64_to_cpu(info->rfiles);
1146  			ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
1147  			ci->i_dir_pin = iinfo->dir_pin;
1148  			ci->i_rsnaps = iinfo->rsnaps;
1149  			ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
1150  		}
1151  	}
1152  
1153  	/* xattrs */
1154  	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
1155  	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
1156  	    le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
1157  		if (ci->i_xattrs.blob)
1158  			old_blob = ci->i_xattrs.blob;
1159  		ci->i_xattrs.blob = xattr_blob;
1160  		if (xattr_blob)
1161  			memcpy(ci->i_xattrs.blob->vec.iov_base,
1162  			       iinfo->xattr_data, iinfo->xattr_len);
1163  		ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
1164  		ceph_forget_all_cached_acls(inode);
1165  		ceph_security_invalidate_secctx(inode);
1166  		xattr_blob = NULL;
1167  	}
1168  
1169  	/* finally update i_version */
1170  	if (le64_to_cpu(info->version) > ci->i_version)
1171  		ci->i_version = le64_to_cpu(info->version);
1172  
1173  	inode->i_mapping->a_ops = &ceph_aops;
1174  
1175  	switch (inode->i_mode & S_IFMT) {
1176  	case S_IFIFO:
1177  	case S_IFBLK:
1178  	case S_IFCHR:
1179  	case S_IFSOCK:
1180  		inode->i_blkbits = PAGE_SHIFT;
1181  		init_special_inode(inode, inode->i_mode, rdev);
1182  		inode->i_op = &ceph_file_iops;
1183  		break;
1184  	case S_IFREG:
1185  		inode->i_op = &ceph_file_iops;
1186  		inode->i_fop = &ceph_file_fops;
1187  		break;
1188  	case S_IFLNK:
1189  		if (!ci->i_symlink) {
1190  			u32 symlen = iinfo->symlink_len;
1191  			char *sym;
1192  
1193  			spin_unlock(&ci->i_ceph_lock);
1194  
1195  			if (IS_ENCRYPTED(inode)) {
1196  				if (symlen != i_size_read(inode))
1197  					pr_err_client(cl,
1198  						"%p %llx.%llx BAD symlink size %lld\n",
1199  						inode, ceph_vinop(inode),
1200  						i_size_read(inode));
1201  
1202  				err = decode_encrypted_symlink(mdsc, iinfo->symlink,
1203  							       symlen, (u8 **)&sym);
1204  				if (err < 0) {
1205  					pr_err_client(cl,
1206  						"decoding encrypted symlink failed: %d\n",
1207  						err);
1208  					goto out;
1209  				}
1210  				symlen = err;
1211  				i_size_write(inode, symlen);
1212  				inode->i_blocks = calc_inode_blocks(symlen);
1213  			} else {
1214  				if (symlen != i_size_read(inode)) {
1215  					pr_err_client(cl,
1216  						"%p %llx.%llx BAD symlink size %lld\n",
1217  						inode, ceph_vinop(inode),
1218  						i_size_read(inode));
1219  					i_size_write(inode, symlen);
1220  					inode->i_blocks = calc_inode_blocks(symlen);
1221  				}
1222  
1223  				err = -ENOMEM;
1224  				sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
1225  				if (!sym)
1226  					goto out;
1227  			}
1228  
1229  			spin_lock(&ci->i_ceph_lock);
1230  			if (!ci->i_symlink)
1231  				ci->i_symlink = sym;
1232  			else
1233  				kfree(sym); /* lost a race */
1234  		}
1235  
1236  		if (IS_ENCRYPTED(inode)) {
1237  			/*
1238  			 * Encrypted symlinks need to be decrypted before we can
1239  			 * cache their targets in i_link. Don't touch it here.
1240  			 */
1241  			inode->i_op = &ceph_encrypted_symlink_iops;
1242  		} else {
1243  			inode->i_link = ci->i_symlink;
1244  			inode->i_op = &ceph_symlink_iops;
1245  		}
1246  		break;
1247  	case S_IFDIR:
1248  		inode->i_op = &ceph_dir_iops;
1249  		inode->i_fop = &ceph_dir_fops;
1250  		break;
1251  	default:
1252  		pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
1253  			      ceph_vinop(inode), inode->i_mode);
1254  	}
1255  
1256  	/* were we issued a capability? */
1257  	if (info_caps) {
1258  		if (ceph_snap(inode) == CEPH_NOSNAP) {
1259  			ceph_add_cap(inode, session,
1260  				     le64_to_cpu(info->cap.cap_id),
1261  				     info_caps,
1262  				     le32_to_cpu(info->cap.wanted),
1263  				     le32_to_cpu(info->cap.seq),
1264  				     le32_to_cpu(info->cap.mseq),
1265  				     le64_to_cpu(info->cap.realm),
1266  				     info->cap.flags, &new_cap);
1267  
1268  			/* set dir completion flag? */
1269  			if (S_ISDIR(inode->i_mode) &&
1270  			    ci->i_files == 0 && ci->i_subdirs == 0 &&
1271  			    (info_caps & CEPH_CAP_FILE_SHARED) &&
1272  			    (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1273  			    !__ceph_dir_is_complete(ci)) {
1274  				doutc(cl, " marking %p complete (empty)\n",
1275  				      inode);
1276  				i_size_write(inode, 0);
1277  				__ceph_dir_set_complete(ci,
1278  					atomic64_read(&ci->i_release_count),
1279  					atomic64_read(&ci->i_ordered_count));
1280  			}
1281  
1282  			wake = true;
1283  		} else {
1284  			doutc(cl, " %p got snap_caps %s\n", inode,
1285  			      ceph_cap_string(info_caps));
1286  			ci->i_snap_caps |= info_caps;
1287  		}
1288  	}
1289  
1290  	if (iinfo->inline_version > 0 &&
1291  	    iinfo->inline_version >= ci->i_inline_version) {
1292  		int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1293  		ci->i_inline_version = iinfo->inline_version;
1294  		if (ceph_has_inline_data(ci) &&
1295  		    (locked_page || (info_caps & cache_caps)))
1296  			fill_inline = true;
1297  	}
1298  
1299  	if (cap_fmode >= 0) {
1300  		if (!info_caps)
1301  			pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
1302  				       ceph_vinop(inode));
1303  		__ceph_touch_fmode(ci, mdsc, cap_fmode);
1304  	}
1305  
1306  	spin_unlock(&ci->i_ceph_lock);
1307  
1308  	ceph_fscache_register_inode_cookie(inode);
1309  
1310  	if (fill_inline)
1311  		ceph_fill_inline_data(inode, locked_page,
1312  				      iinfo->inline_data, iinfo->inline_len);
1313  
1314  	if (wake)
1315  		wake_up_all(&ci->i_cap_wq);
1316  
1317  	/* queue truncate if we saw i_size decrease */
1318  	if (queue_trunc)
1319  		ceph_queue_vmtruncate(inode);
1320  
1321  	/* populate frag tree */
1322  	if (S_ISDIR(inode->i_mode))
1323  		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1324  
1325  	/* update delegation info? */
1326  	if (dirinfo)
1327  		ceph_fill_dirfrag(inode, dirinfo);
1328  
1329  	err = 0;
1330  out:
1331  	if (new_cap)
1332  		ceph_put_cap(mdsc, new_cap);
1333  	ceph_buffer_put(old_blob);
1334  	ceph_buffer_put(xattr_blob);
1335  	ceph_put_string(pool_ns);
1336  	return err;
1337  }
1338  
1339  /*
1340   * caller should hold session s_mutex and dentry->d_lock.
1341   */
__update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,struct ceph_mds_session ** old_lease_session)1342  static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1343  				  struct ceph_mds_reply_lease *lease,
1344  				  struct ceph_mds_session *session,
1345  				  unsigned long from_time,
1346  				  struct ceph_mds_session **old_lease_session)
1347  {
1348  	struct ceph_client *cl = ceph_inode_to_client(dir);
1349  	struct ceph_dentry_info *di = ceph_dentry(dentry);
1350  	unsigned mask = le16_to_cpu(lease->mask);
1351  	long unsigned duration = le32_to_cpu(lease->duration_ms);
1352  	long unsigned ttl = from_time + (duration * HZ) / 1000;
1353  	long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1354  
1355  	doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
1356  
1357  	/* only track leases on regular dentries */
1358  	if (ceph_snap(dir) != CEPH_NOSNAP)
1359  		return;
1360  
1361  	if (mask & CEPH_LEASE_PRIMARY_LINK)
1362  		di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1363  	else
1364  		di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1365  
1366  	di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1367  	if (!(mask & CEPH_LEASE_VALID)) {
1368  		__ceph_dentry_dir_lease_touch(di);
1369  		return;
1370  	}
1371  
1372  	if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1373  	    time_before(ttl, di->time))
1374  		return;  /* we already have a newer lease. */
1375  
1376  	if (di->lease_session && di->lease_session != session) {
1377  		*old_lease_session = di->lease_session;
1378  		di->lease_session = NULL;
1379  	}
1380  
1381  	if (!di->lease_session)
1382  		di->lease_session = ceph_get_mds_session(session);
1383  	di->lease_gen = atomic_read(&session->s_cap_gen);
1384  	di->lease_seq = le32_to_cpu(lease->seq);
1385  	di->lease_renew_after = half_ttl;
1386  	di->lease_renew_from = 0;
1387  	di->time = ttl;
1388  
1389  	__ceph_dentry_lease_touch(di);
1390  }
1391  
update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time)1392  static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1393  					struct ceph_mds_reply_lease *lease,
1394  					struct ceph_mds_session *session,
1395  					unsigned long from_time)
1396  {
1397  	struct ceph_mds_session *old_lease_session = NULL;
1398  	spin_lock(&dentry->d_lock);
1399  	__update_dentry_lease(dir, dentry, lease, session, from_time,
1400  			      &old_lease_session);
1401  	spin_unlock(&dentry->d_lock);
1402  	ceph_put_mds_session(old_lease_session);
1403  }
1404  
1405  /*
1406   * update dentry lease without having parent inode locked
1407   */
update_dentry_lease_careful(struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,char * dname,u32 dname_len,struct ceph_vino * pdvino,struct ceph_vino * ptvino)1408  static void update_dentry_lease_careful(struct dentry *dentry,
1409  					struct ceph_mds_reply_lease *lease,
1410  					struct ceph_mds_session *session,
1411  					unsigned long from_time,
1412  					char *dname, u32 dname_len,
1413  					struct ceph_vino *pdvino,
1414  					struct ceph_vino *ptvino)
1415  
1416  {
1417  	struct inode *dir;
1418  	struct ceph_mds_session *old_lease_session = NULL;
1419  
1420  	spin_lock(&dentry->d_lock);
1421  	/* make sure dentry's name matches target */
1422  	if (dentry->d_name.len != dname_len ||
1423  	    memcmp(dentry->d_name.name, dname, dname_len))
1424  		goto out_unlock;
1425  
1426  	dir = d_inode(dentry->d_parent);
1427  	/* make sure parent matches dvino */
1428  	if (!ceph_ino_compare(dir, pdvino))
1429  		goto out_unlock;
1430  
1431  	/* make sure dentry's inode matches target. NULL ptvino means that
1432  	 * we expect a negative dentry */
1433  	if (ptvino) {
1434  		if (d_really_is_negative(dentry))
1435  			goto out_unlock;
1436  		if (!ceph_ino_compare(d_inode(dentry), ptvino))
1437  			goto out_unlock;
1438  	} else {
1439  		if (d_really_is_positive(dentry))
1440  			goto out_unlock;
1441  	}
1442  
1443  	__update_dentry_lease(dir, dentry, lease, session,
1444  			      from_time, &old_lease_session);
1445  out_unlock:
1446  	spin_unlock(&dentry->d_lock);
1447  	ceph_put_mds_session(old_lease_session);
1448  }
1449  
1450  /*
1451   * splice a dentry to an inode.
1452   * caller must hold directory i_rwsem for this to be safe.
1453   */
splice_dentry(struct dentry ** pdn,struct inode * in)1454  static int splice_dentry(struct dentry **pdn, struct inode *in)
1455  {
1456  	struct ceph_client *cl = ceph_inode_to_client(in);
1457  	struct dentry *dn = *pdn;
1458  	struct dentry *realdn;
1459  
1460  	BUG_ON(d_inode(dn));
1461  
1462  	if (S_ISDIR(in->i_mode)) {
1463  		/* If inode is directory, d_splice_alias() below will remove
1464  		 * 'realdn' from its origin parent. We need to ensure that
1465  		 * origin parent's readdir cache will not reference 'realdn'
1466  		 */
1467  		realdn = d_find_any_alias(in);
1468  		if (realdn) {
1469  			struct ceph_dentry_info *di = ceph_dentry(realdn);
1470  			spin_lock(&realdn->d_lock);
1471  
1472  			realdn->d_op->d_prune(realdn);
1473  
1474  			di->time = jiffies;
1475  			di->lease_shared_gen = 0;
1476  			di->offset = 0;
1477  
1478  			spin_unlock(&realdn->d_lock);
1479  			dput(realdn);
1480  		}
1481  	}
1482  
1483  	/* dn must be unhashed */
1484  	if (!d_unhashed(dn))
1485  		d_drop(dn);
1486  	realdn = d_splice_alias(in, dn);
1487  	if (IS_ERR(realdn)) {
1488  		pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
1489  			      PTR_ERR(realdn), dn, in, ceph_vinop(in));
1490  		return PTR_ERR(realdn);
1491  	}
1492  
1493  	if (realdn) {
1494  		doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n",
1495  		      dn, d_count(dn), realdn, d_count(realdn),
1496  		      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1497  		dput(dn);
1498  		*pdn = realdn;
1499  	} else {
1500  		BUG_ON(!ceph_dentry(dn));
1501  		doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
1502  		      d_inode(dn), ceph_vinop(d_inode(dn)));
1503  	}
1504  	return 0;
1505  }
1506  
1507  /*
1508   * Incorporate results into the local cache.  This is either just
1509   * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1510   * after a lookup).
1511   *
1512   * A reply may contain
1513   *         a directory inode along with a dentry.
1514   *  and/or a target inode
1515   *
1516   * Called with snap_rwsem (read).
1517   */
ceph_fill_trace(struct super_block * sb,struct ceph_mds_request * req)1518  int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1519  {
1520  	struct ceph_mds_session *session = req->r_session;
1521  	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1522  	struct inode *in = NULL;
1523  	struct ceph_vino tvino, dvino;
1524  	struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1525  	struct ceph_client *cl = fsc->client;
1526  	int err = 0;
1527  
1528  	doutc(cl, "%p is_dentry %d is_target %d\n", req,
1529  	      rinfo->head->is_dentry, rinfo->head->is_target);
1530  
1531  	if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1532  		doutc(cl, "reply is empty!\n");
1533  		if (rinfo->head->result == 0 && req->r_parent)
1534  			ceph_invalidate_dir_request(req);
1535  		return 0;
1536  	}
1537  
1538  	if (rinfo->head->is_dentry) {
1539  		struct inode *dir = req->r_parent;
1540  
1541  		if (dir) {
1542  			err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1543  					      rinfo->dirfrag, session, -1,
1544  					      &req->r_caps_reservation);
1545  			if (err < 0)
1546  				goto done;
1547  		} else {
1548  			WARN_ON_ONCE(1);
1549  		}
1550  
1551  		if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1552  		    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1553  		    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1554  			bool is_nokey = false;
1555  			struct qstr dname;
1556  			struct dentry *dn, *parent;
1557  			struct fscrypt_str oname = FSTR_INIT(NULL, 0);
1558  			struct ceph_fname fname = { .dir	= dir,
1559  						    .name	= rinfo->dname,
1560  						    .ctext	= rinfo->altname,
1561  						    .name_len	= rinfo->dname_len,
1562  						    .ctext_len	= rinfo->altname_len };
1563  
1564  			BUG_ON(!rinfo->head->is_target);
1565  			BUG_ON(req->r_dentry);
1566  
1567  			parent = d_find_any_alias(dir);
1568  			BUG_ON(!parent);
1569  
1570  			err = ceph_fname_alloc_buffer(dir, &oname);
1571  			if (err < 0) {
1572  				dput(parent);
1573  				goto done;
1574  			}
1575  
1576  			err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
1577  			if (err < 0) {
1578  				dput(parent);
1579  				ceph_fname_free_buffer(dir, &oname);
1580  				goto done;
1581  			}
1582  			dname.name = oname.name;
1583  			dname.len = oname.len;
1584  			dname.hash = full_name_hash(parent, dname.name, dname.len);
1585  			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1586  			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1587  retry_lookup:
1588  			dn = d_lookup(parent, &dname);
1589  			doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1590  			      parent, dname.len, dname.name, dn);
1591  
1592  			if (!dn) {
1593  				dn = d_alloc(parent, &dname);
1594  				doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1595  				      dname.len, dname.name, dn);
1596  				if (!dn) {
1597  					dput(parent);
1598  					ceph_fname_free_buffer(dir, &oname);
1599  					err = -ENOMEM;
1600  					goto done;
1601  				}
1602  				if (is_nokey) {
1603  					spin_lock(&dn->d_lock);
1604  					dn->d_flags |= DCACHE_NOKEY_NAME;
1605  					spin_unlock(&dn->d_lock);
1606  				}
1607  				err = 0;
1608  			} else if (d_really_is_positive(dn) &&
1609  				   (ceph_ino(d_inode(dn)) != tvino.ino ||
1610  				    ceph_snap(d_inode(dn)) != tvino.snap)) {
1611  				doutc(cl, " dn %p points to wrong inode %p\n",
1612  				      dn, d_inode(dn));
1613  				ceph_dir_clear_ordered(dir);
1614  				d_delete(dn);
1615  				dput(dn);
1616  				goto retry_lookup;
1617  			}
1618  			ceph_fname_free_buffer(dir, &oname);
1619  
1620  			req->r_dentry = dn;
1621  			dput(parent);
1622  		}
1623  	}
1624  
1625  	if (rinfo->head->is_target) {
1626  		/* Should be filled in by handle_reply */
1627  		BUG_ON(!req->r_target_inode);
1628  
1629  		in = req->r_target_inode;
1630  		err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1631  				NULL, session,
1632  				(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1633  				 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1634  				 rinfo->head->result == 0) ?  req->r_fmode : -1,
1635  				&req->r_caps_reservation);
1636  		if (err < 0) {
1637  			pr_err_client(cl, "badness %p %llx.%llx\n", in,
1638  				      ceph_vinop(in));
1639  			req->r_target_inode = NULL;
1640  			if (in->i_state & I_NEW)
1641  				discard_new_inode(in);
1642  			else
1643  				iput(in);
1644  			goto done;
1645  		}
1646  		if (in->i_state & I_NEW)
1647  			unlock_new_inode(in);
1648  	}
1649  
1650  	/*
1651  	 * ignore null lease/binding on snapdir ENOENT, or else we
1652  	 * will have trouble splicing in the virtual snapdir later
1653  	 */
1654  	if (rinfo->head->is_dentry &&
1655              !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1656  	    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1657  	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1658  					       fsc->mount_options->snapdir_name,
1659  					       req->r_dentry->d_name.len))) {
1660  		/*
1661  		 * lookup link rename   : null -> possibly existing inode
1662  		 * mknod symlink mkdir  : null -> new inode
1663  		 * unlink               : linked -> null
1664  		 */
1665  		struct inode *dir = req->r_parent;
1666  		struct dentry *dn = req->r_dentry;
1667  		bool have_dir_cap, have_lease;
1668  
1669  		BUG_ON(!dn);
1670  		BUG_ON(!dir);
1671  		BUG_ON(d_inode(dn->d_parent) != dir);
1672  
1673  		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1674  		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1675  
1676  		BUG_ON(ceph_ino(dir) != dvino.ino);
1677  		BUG_ON(ceph_snap(dir) != dvino.snap);
1678  
1679  		/* do we have a lease on the whole dir? */
1680  		have_dir_cap =
1681  			(le32_to_cpu(rinfo->diri.in->cap.caps) &
1682  			 CEPH_CAP_FILE_SHARED);
1683  
1684  		/* do we have a dn lease? */
1685  		have_lease = have_dir_cap ||
1686  			le32_to_cpu(rinfo->dlease->duration_ms);
1687  		if (!have_lease)
1688  			doutc(cl, "no dentry lease or dir cap\n");
1689  
1690  		/* rename? */
1691  		if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1692  			struct inode *olddir = req->r_old_dentry_dir;
1693  			BUG_ON(!olddir);
1694  
1695  			doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1696  			      req->r_old_dentry, req->r_old_dentry, dn, dn);
1697  			doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn);
1698  
1699  			/* d_move screws up sibling dentries' offsets */
1700  			ceph_dir_clear_ordered(dir);
1701  			ceph_dir_clear_ordered(olddir);
1702  
1703  			d_move(req->r_old_dentry, dn);
1704  			doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1705  			      req->r_old_dentry, req->r_old_dentry, dn, dn);
1706  
1707  			/* ensure target dentry is invalidated, despite
1708  			   rehashing bug in vfs_rename_dir */
1709  			ceph_invalidate_dentry_lease(dn);
1710  
1711  			doutc(cl, "dn %p gets new offset %lld\n",
1712  			      req->r_old_dentry,
1713  			      ceph_dentry(req->r_old_dentry)->offset);
1714  
1715  			/* swap r_dentry and r_old_dentry in case that
1716  			 * splice_dentry() gets called later. This is safe
1717  			 * because no other place will use them */
1718  			req->r_dentry = req->r_old_dentry;
1719  			req->r_old_dentry = dn;
1720  			dn = req->r_dentry;
1721  		}
1722  
1723  		/* null dentry? */
1724  		if (!rinfo->head->is_target) {
1725  			doutc(cl, "null dentry\n");
1726  			if (d_really_is_positive(dn)) {
1727  				doutc(cl, "d_delete %p\n", dn);
1728  				ceph_dir_clear_ordered(dir);
1729  				d_delete(dn);
1730  			} else if (have_lease) {
1731  				if (d_unhashed(dn))
1732  					d_add(dn, NULL);
1733  			}
1734  
1735  			if (!d_unhashed(dn) && have_lease)
1736  				update_dentry_lease(dir, dn,
1737  						    rinfo->dlease, session,
1738  						    req->r_request_started);
1739  			goto done;
1740  		}
1741  
1742  		/* attach proper inode */
1743  		if (d_really_is_negative(dn)) {
1744  			ceph_dir_clear_ordered(dir);
1745  			ihold(in);
1746  			err = splice_dentry(&req->r_dentry, in);
1747  			if (err < 0)
1748  				goto done;
1749  			dn = req->r_dentry;  /* may have spliced */
1750  		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1751  			doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n",
1752  			      dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1753  			      ceph_vinop(in));
1754  			d_invalidate(dn);
1755  			have_lease = false;
1756  		}
1757  
1758  		if (have_lease) {
1759  			update_dentry_lease(dir, dn,
1760  					    rinfo->dlease, session,
1761  					    req->r_request_started);
1762  		}
1763  		doutc(cl, " final dn %p\n", dn);
1764  	} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1765  		    req->r_op == CEPH_MDS_OP_MKSNAP) &&
1766  	           test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1767  		   !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1768  		struct inode *dir = req->r_parent;
1769  
1770  		/* fill out a snapdir LOOKUPSNAP dentry */
1771  		BUG_ON(!dir);
1772  		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1773  		BUG_ON(!req->r_dentry);
1774  		doutc(cl, " linking snapped dir %p to dn %p\n", in,
1775  		      req->r_dentry);
1776  		ceph_dir_clear_ordered(dir);
1777  		ihold(in);
1778  		err = splice_dentry(&req->r_dentry, in);
1779  		if (err < 0)
1780  			goto done;
1781  	} else if (rinfo->head->is_dentry && req->r_dentry) {
1782  		/* parent inode is not locked, be careful */
1783  		struct ceph_vino *ptvino = NULL;
1784  		dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1785  		dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1786  		if (rinfo->head->is_target) {
1787  			tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1788  			tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1789  			ptvino = &tvino;
1790  		}
1791  		update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1792  					    session, req->r_request_started,
1793  					    rinfo->dname, rinfo->dname_len,
1794  					    &dvino, ptvino);
1795  	}
1796  done:
1797  	doutc(cl, "done err=%d\n", err);
1798  	return err;
1799  }
1800  
1801  /*
1802   * Prepopulate our cache with readdir results, leases, etc.
1803   */
readdir_prepopulate_inodes_only(struct ceph_mds_request * req,struct ceph_mds_session * session)1804  static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1805  					   struct ceph_mds_session *session)
1806  {
1807  	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1808  	struct ceph_client *cl = session->s_mdsc->fsc->client;
1809  	int i, err = 0;
1810  
1811  	for (i = 0; i < rinfo->dir_nr; i++) {
1812  		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1813  		struct ceph_vino vino;
1814  		struct inode *in;
1815  		int rc;
1816  
1817  		vino.ino = le64_to_cpu(rde->inode.in->ino);
1818  		vino.snap = le64_to_cpu(rde->inode.in->snapid);
1819  
1820  		in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL);
1821  		if (IS_ERR(in)) {
1822  			err = PTR_ERR(in);
1823  			doutc(cl, "badness got %d\n", err);
1824  			continue;
1825  		}
1826  		rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1827  				     -1, &req->r_caps_reservation);
1828  		if (rc < 0) {
1829  			pr_err_client(cl, "inode badness on %p got %d\n", in,
1830  				      rc);
1831  			err = rc;
1832  			if (in->i_state & I_NEW) {
1833  				ihold(in);
1834  				discard_new_inode(in);
1835  			}
1836  		} else if (in->i_state & I_NEW) {
1837  			unlock_new_inode(in);
1838  		}
1839  
1840  		iput(in);
1841  	}
1842  
1843  	return err;
1844  }
1845  
ceph_readdir_cache_release(struct ceph_readdir_cache_control * ctl)1846  void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1847  {
1848  	if (ctl->page) {
1849  		kunmap(ctl->page);
1850  		put_page(ctl->page);
1851  		ctl->page = NULL;
1852  	}
1853  }
1854  
fill_readdir_cache(struct inode * dir,struct dentry * dn,struct ceph_readdir_cache_control * ctl,struct ceph_mds_request * req)1855  static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1856  			      struct ceph_readdir_cache_control *ctl,
1857  			      struct ceph_mds_request *req)
1858  {
1859  	struct ceph_client *cl = ceph_inode_to_client(dir);
1860  	struct ceph_inode_info *ci = ceph_inode(dir);
1861  	unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1862  	unsigned idx = ctl->index % nsize;
1863  	pgoff_t pgoff = ctl->index / nsize;
1864  
1865  	if (!ctl->page || pgoff != ctl->page->index) {
1866  		ceph_readdir_cache_release(ctl);
1867  		if (idx == 0)
1868  			ctl->page = grab_cache_page(&dir->i_data, pgoff);
1869  		else
1870  			ctl->page = find_lock_page(&dir->i_data, pgoff);
1871  		if (!ctl->page) {
1872  			ctl->index = -1;
1873  			return idx == 0 ? -ENOMEM : 0;
1874  		}
1875  		/* reading/filling the cache are serialized by
1876  		 * i_rwsem, no need to use page lock */
1877  		unlock_page(ctl->page);
1878  		ctl->dentries = kmap(ctl->page);
1879  		if (idx == 0)
1880  			memset(ctl->dentries, 0, PAGE_SIZE);
1881  	}
1882  
1883  	if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1884  	    req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1885  		doutc(cl, "dn %p idx %d\n", dn, ctl->index);
1886  		ctl->dentries[idx] = dn;
1887  		ctl->index++;
1888  	} else {
1889  		doutc(cl, "disable readdir cache\n");
1890  		ctl->index = -1;
1891  	}
1892  	return 0;
1893  }
1894  
ceph_readdir_prepopulate(struct ceph_mds_request * req,struct ceph_mds_session * session)1895  int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1896  			     struct ceph_mds_session *session)
1897  {
1898  	struct dentry *parent = req->r_dentry;
1899  	struct inode *inode = d_inode(parent);
1900  	struct ceph_inode_info *ci = ceph_inode(inode);
1901  	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1902  	struct ceph_client *cl = session->s_mdsc->fsc->client;
1903  	struct qstr dname;
1904  	struct dentry *dn;
1905  	struct inode *in;
1906  	int err = 0, skipped = 0, ret, i;
1907  	u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1908  	u32 last_hash = 0;
1909  	u32 fpos_offset;
1910  	struct ceph_readdir_cache_control cache_ctl = {};
1911  
1912  	if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1913  		return readdir_prepopulate_inodes_only(req, session);
1914  
1915  	if (rinfo->hash_order) {
1916  		if (req->r_path2) {
1917  			last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1918  						  req->r_path2,
1919  						  strlen(req->r_path2));
1920  			last_hash = ceph_frag_value(last_hash);
1921  		} else if (rinfo->offset_hash) {
1922  			/* mds understands offset_hash */
1923  			WARN_ON_ONCE(req->r_readdir_offset != 2);
1924  			last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1925  		}
1926  	}
1927  
1928  	if (rinfo->dir_dir &&
1929  	    le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1930  		doutc(cl, "got new frag %x -> %x\n", frag,
1931  			    le32_to_cpu(rinfo->dir_dir->frag));
1932  		frag = le32_to_cpu(rinfo->dir_dir->frag);
1933  		if (!rinfo->hash_order)
1934  			req->r_readdir_offset = 2;
1935  	}
1936  
1937  	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1938  		doutc(cl, "%d items under SNAPDIR dn %p\n",
1939  		      rinfo->dir_nr, parent);
1940  	} else {
1941  		doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent);
1942  		if (rinfo->dir_dir)
1943  			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1944  
1945  		if (ceph_frag_is_leftmost(frag) &&
1946  		    req->r_readdir_offset == 2 &&
1947  		    !(rinfo->hash_order && last_hash)) {
1948  			/* note dir version at start of readdir so we can
1949  			 * tell if any dentries get dropped */
1950  			req->r_dir_release_cnt =
1951  				atomic64_read(&ci->i_release_count);
1952  			req->r_dir_ordered_cnt =
1953  				atomic64_read(&ci->i_ordered_count);
1954  			req->r_readdir_cache_idx = 0;
1955  		}
1956  	}
1957  
1958  	cache_ctl.index = req->r_readdir_cache_idx;
1959  	fpos_offset = req->r_readdir_offset;
1960  
1961  	/* FIXME: release caps/leases if error occurs */
1962  	for (i = 0; i < rinfo->dir_nr; i++) {
1963  		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1964  		struct ceph_vino tvino;
1965  
1966  		dname.name = rde->name;
1967  		dname.len = rde->name_len;
1968  		dname.hash = full_name_hash(parent, dname.name, dname.len);
1969  
1970  		tvino.ino = le64_to_cpu(rde->inode.in->ino);
1971  		tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1972  
1973  		if (rinfo->hash_order) {
1974  			u32 hash = ceph_frag_value(rde->raw_hash);
1975  			if (hash != last_hash)
1976  				fpos_offset = 2;
1977  			last_hash = hash;
1978  			rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1979  		} else {
1980  			rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1981  		}
1982  
1983  retry_lookup:
1984  		dn = d_lookup(parent, &dname);
1985  		doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1986  		      parent, dname.len, dname.name, dn);
1987  
1988  		if (!dn) {
1989  			dn = d_alloc(parent, &dname);
1990  			doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1991  			      dname.len, dname.name, dn);
1992  			if (!dn) {
1993  				doutc(cl, "d_alloc badness\n");
1994  				err = -ENOMEM;
1995  				goto out;
1996  			}
1997  			if (rde->is_nokey) {
1998  				spin_lock(&dn->d_lock);
1999  				dn->d_flags |= DCACHE_NOKEY_NAME;
2000  				spin_unlock(&dn->d_lock);
2001  			}
2002  		} else if (d_really_is_positive(dn) &&
2003  			   (ceph_ino(d_inode(dn)) != tvino.ino ||
2004  			    ceph_snap(d_inode(dn)) != tvino.snap)) {
2005  			struct ceph_dentry_info *di = ceph_dentry(dn);
2006  			doutc(cl, " dn %p points to wrong inode %p\n",
2007  			      dn, d_inode(dn));
2008  
2009  			spin_lock(&dn->d_lock);
2010  			if (di->offset > 0 &&
2011  			    di->lease_shared_gen ==
2012  			    atomic_read(&ci->i_shared_gen)) {
2013  				__ceph_dir_clear_ordered(ci);
2014  				di->offset = 0;
2015  			}
2016  			spin_unlock(&dn->d_lock);
2017  
2018  			d_delete(dn);
2019  			dput(dn);
2020  			goto retry_lookup;
2021  		}
2022  
2023  		/* inode */
2024  		if (d_really_is_positive(dn)) {
2025  			in = d_inode(dn);
2026  		} else {
2027  			in = ceph_get_inode(parent->d_sb, tvino, NULL);
2028  			if (IS_ERR(in)) {
2029  				doutc(cl, "new_inode badness\n");
2030  				d_drop(dn);
2031  				dput(dn);
2032  				err = PTR_ERR(in);
2033  				goto out;
2034  			}
2035  		}
2036  
2037  		ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
2038  				      -1, &req->r_caps_reservation);
2039  		if (ret < 0) {
2040  			pr_err_client(cl, "badness on %p %llx.%llx\n", in,
2041  				      ceph_vinop(in));
2042  			if (d_really_is_negative(dn)) {
2043  				if (in->i_state & I_NEW) {
2044  					ihold(in);
2045  					discard_new_inode(in);
2046  				}
2047  				iput(in);
2048  			}
2049  			d_drop(dn);
2050  			err = ret;
2051  			goto next_item;
2052  		}
2053  		if (in->i_state & I_NEW)
2054  			unlock_new_inode(in);
2055  
2056  		if (d_really_is_negative(dn)) {
2057  			if (ceph_security_xattr_deadlock(in)) {
2058  				doutc(cl, " skip splicing dn %p to inode %p"
2059  				      " (security xattr deadlock)\n", dn, in);
2060  				iput(in);
2061  				skipped++;
2062  				goto next_item;
2063  			}
2064  
2065  			err = splice_dentry(&dn, in);
2066  			if (err < 0)
2067  				goto next_item;
2068  		}
2069  
2070  		ceph_dentry(dn)->offset = rde->offset;
2071  
2072  		update_dentry_lease(d_inode(parent), dn,
2073  				    rde->lease, req->r_session,
2074  				    req->r_request_started);
2075  
2076  		if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
2077  			ret = fill_readdir_cache(d_inode(parent), dn,
2078  						 &cache_ctl, req);
2079  			if (ret < 0)
2080  				err = ret;
2081  		}
2082  next_item:
2083  		dput(dn);
2084  	}
2085  out:
2086  	if (err == 0 && skipped == 0) {
2087  		set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
2088  		req->r_readdir_cache_idx = cache_ctl.index;
2089  	}
2090  	ceph_readdir_cache_release(&cache_ctl);
2091  	doutc(cl, "done\n");
2092  	return err;
2093  }
2094  
ceph_inode_set_size(struct inode * inode,loff_t size)2095  bool ceph_inode_set_size(struct inode *inode, loff_t size)
2096  {
2097  	struct ceph_client *cl = ceph_inode_to_client(inode);
2098  	struct ceph_inode_info *ci = ceph_inode(inode);
2099  	bool ret;
2100  
2101  	spin_lock(&ci->i_ceph_lock);
2102  	doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
2103  	i_size_write(inode, size);
2104  	ceph_fscache_update(inode);
2105  	inode->i_blocks = calc_inode_blocks(size);
2106  
2107  	ret = __ceph_should_report_size(ci);
2108  
2109  	spin_unlock(&ci->i_ceph_lock);
2110  
2111  	return ret;
2112  }
2113  
ceph_queue_inode_work(struct inode * inode,int work_bit)2114  void ceph_queue_inode_work(struct inode *inode, int work_bit)
2115  {
2116  	struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2117  	struct ceph_client *cl = fsc->client;
2118  	struct ceph_inode_info *ci = ceph_inode(inode);
2119  	set_bit(work_bit, &ci->i_work_mask);
2120  
2121  	ihold(inode);
2122  	if (queue_work(fsc->inode_wq, &ci->i_work)) {
2123  		doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
2124  		      ceph_vinop(inode), ci->i_work_mask);
2125  	} else {
2126  		doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
2127  		      inode, ceph_vinop(inode), ci->i_work_mask);
2128  		iput(inode);
2129  	}
2130  }
2131  
ceph_do_invalidate_pages(struct inode * inode)2132  static void ceph_do_invalidate_pages(struct inode *inode)
2133  {
2134  	struct ceph_client *cl = ceph_inode_to_client(inode);
2135  	struct ceph_inode_info *ci = ceph_inode(inode);
2136  	u32 orig_gen;
2137  	int check = 0;
2138  
2139  	ceph_fscache_invalidate(inode, false);
2140  
2141  	mutex_lock(&ci->i_truncate_mutex);
2142  
2143  	if (ceph_inode_is_shutdown(inode)) {
2144  		pr_warn_ratelimited_client(cl,
2145  			"%p %llx.%llx is shut down\n", inode,
2146  			ceph_vinop(inode));
2147  		mapping_set_error(inode->i_mapping, -EIO);
2148  		truncate_pagecache(inode, 0);
2149  		mutex_unlock(&ci->i_truncate_mutex);
2150  		goto out;
2151  	}
2152  
2153  	spin_lock(&ci->i_ceph_lock);
2154  	doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
2155  	      ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking);
2156  	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2157  		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2158  			check = 1;
2159  		spin_unlock(&ci->i_ceph_lock);
2160  		mutex_unlock(&ci->i_truncate_mutex);
2161  		goto out;
2162  	}
2163  	orig_gen = ci->i_rdcache_gen;
2164  	spin_unlock(&ci->i_ceph_lock);
2165  
2166  	if (invalidate_inode_pages2(inode->i_mapping) < 0) {
2167  		pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
2168  			      ceph_vinop(inode));
2169  	}
2170  
2171  	spin_lock(&ci->i_ceph_lock);
2172  	if (orig_gen == ci->i_rdcache_gen &&
2173  	    orig_gen == ci->i_rdcache_revoking) {
2174  		doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
2175  		      ceph_vinop(inode), ci->i_rdcache_gen);
2176  		ci->i_rdcache_revoking--;
2177  		check = 1;
2178  	} else {
2179  		doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
2180  		      inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen,
2181  		      ci->i_rdcache_revoking);
2182  		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2183  			check = 1;
2184  	}
2185  	spin_unlock(&ci->i_ceph_lock);
2186  	mutex_unlock(&ci->i_truncate_mutex);
2187  out:
2188  	if (check)
2189  		ceph_check_caps(ci, 0);
2190  }
2191  
2192  /*
2193   * Make sure any pending truncation is applied before doing anything
2194   * that may depend on it.
2195   */
__ceph_do_pending_vmtruncate(struct inode * inode)2196  void __ceph_do_pending_vmtruncate(struct inode *inode)
2197  {
2198  	struct ceph_client *cl = ceph_inode_to_client(inode);
2199  	struct ceph_inode_info *ci = ceph_inode(inode);
2200  	u64 to;
2201  	int wrbuffer_refs, finish = 0;
2202  
2203  	mutex_lock(&ci->i_truncate_mutex);
2204  retry:
2205  	spin_lock(&ci->i_ceph_lock);
2206  	if (ci->i_truncate_pending == 0) {
2207  		doutc(cl, "%p %llx.%llx none pending\n", inode,
2208  		      ceph_vinop(inode));
2209  		spin_unlock(&ci->i_ceph_lock);
2210  		mutex_unlock(&ci->i_truncate_mutex);
2211  		return;
2212  	}
2213  
2214  	/*
2215  	 * make sure any dirty snapped pages are flushed before we
2216  	 * possibly truncate them.. so write AND block!
2217  	 */
2218  	if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
2219  		spin_unlock(&ci->i_ceph_lock);
2220  		doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
2221  		      ceph_vinop(inode));
2222  		filemap_write_and_wait_range(&inode->i_data, 0,
2223  					     inode->i_sb->s_maxbytes);
2224  		goto retry;
2225  	}
2226  
2227  	/* there should be no reader or writer */
2228  	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
2229  
2230  	to = ci->i_truncate_pagecache_size;
2231  	wrbuffer_refs = ci->i_wrbuffer_ref;
2232  	doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
2233  	      ci->i_truncate_pending, to);
2234  	spin_unlock(&ci->i_ceph_lock);
2235  
2236  	ceph_fscache_resize(inode, to);
2237  	truncate_pagecache(inode, to);
2238  
2239  	spin_lock(&ci->i_ceph_lock);
2240  	if (to == ci->i_truncate_pagecache_size) {
2241  		ci->i_truncate_pending = 0;
2242  		finish = 1;
2243  	}
2244  	spin_unlock(&ci->i_ceph_lock);
2245  	if (!finish)
2246  		goto retry;
2247  
2248  	mutex_unlock(&ci->i_truncate_mutex);
2249  
2250  	if (wrbuffer_refs == 0)
2251  		ceph_check_caps(ci, 0);
2252  
2253  	wake_up_all(&ci->i_cap_wq);
2254  }
2255  
ceph_inode_work(struct work_struct * work)2256  static void ceph_inode_work(struct work_struct *work)
2257  {
2258  	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2259  						 i_work);
2260  	struct inode *inode = &ci->netfs.inode;
2261  	struct ceph_client *cl = ceph_inode_to_client(inode);
2262  
2263  	if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2264  		doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
2265  		filemap_fdatawrite(&inode->i_data);
2266  	}
2267  	if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2268  		ceph_do_invalidate_pages(inode);
2269  
2270  	if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2271  		__ceph_do_pending_vmtruncate(inode);
2272  
2273  	if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2274  		ceph_check_caps(ci, 0);
2275  
2276  	if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2277  		ceph_flush_snaps(ci, NULL);
2278  
2279  	iput(inode);
2280  }
2281  
ceph_encrypted_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)2282  static const char *ceph_encrypted_get_link(struct dentry *dentry,
2283  					   struct inode *inode,
2284  					   struct delayed_call *done)
2285  {
2286  	struct ceph_inode_info *ci = ceph_inode(inode);
2287  
2288  	if (!dentry)
2289  		return ERR_PTR(-ECHILD);
2290  
2291  	return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
2292  				   done);
2293  }
2294  
ceph_encrypted_symlink_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)2295  static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
2296  					  const struct path *path,
2297  					  struct kstat *stat, u32 request_mask,
2298  					  unsigned int query_flags)
2299  {
2300  	int ret;
2301  
2302  	ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
2303  	if (ret)
2304  		return ret;
2305  	return fscrypt_symlink_getattr(path, stat);
2306  }
2307  
2308  /*
2309   * symlinks
2310   */
2311  static const struct inode_operations ceph_symlink_iops = {
2312  	.get_link = simple_get_link,
2313  	.setattr = ceph_setattr,
2314  	.getattr = ceph_getattr,
2315  	.listxattr = ceph_listxattr,
2316  };
2317  
2318  static const struct inode_operations ceph_encrypted_symlink_iops = {
2319  	.get_link = ceph_encrypted_get_link,
2320  	.setattr = ceph_setattr,
2321  	.getattr = ceph_encrypted_symlink_getattr,
2322  	.listxattr = ceph_listxattr,
2323  };
2324  
2325  /*
2326   * Transfer the encrypted last block to the MDS and the MDS
2327   * will help update it when truncating a smaller size.
2328   *
2329   * We don't support a PAGE_SIZE that is smaller than the
2330   * CEPH_FSCRYPT_BLOCK_SIZE.
2331   */
fill_fscrypt_truncate(struct inode * inode,struct ceph_mds_request * req,struct iattr * attr)2332  static int fill_fscrypt_truncate(struct inode *inode,
2333  				 struct ceph_mds_request *req,
2334  				 struct iattr *attr)
2335  {
2336  	struct ceph_client *cl = ceph_inode_to_client(inode);
2337  	struct ceph_inode_info *ci = ceph_inode(inode);
2338  	int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
2339  	loff_t pos, orig_pos = round_down(attr->ia_size,
2340  					  CEPH_FSCRYPT_BLOCK_SIZE);
2341  	u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
2342  	struct ceph_pagelist *pagelist = NULL;
2343  	struct kvec iov = {0};
2344  	struct iov_iter iter;
2345  	struct page *page = NULL;
2346  	struct ceph_fscrypt_truncate_size_header header;
2347  	int retry_op = 0;
2348  	int len = CEPH_FSCRYPT_BLOCK_SIZE;
2349  	loff_t i_size = i_size_read(inode);
2350  	int got, ret, issued;
2351  	u64 objver;
2352  
2353  	ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
2354  	if (ret < 0)
2355  		return ret;
2356  
2357  	issued = __ceph_caps_issued(ci, NULL);
2358  
2359  	doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
2360  	      i_size, attr->ia_size, ceph_cap_string(got),
2361  	      ceph_cap_string(issued));
2362  
2363  	/* Try to writeback the dirty pagecaches */
2364  	if (issued & (CEPH_CAP_FILE_BUFFER)) {
2365  		loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
2366  
2367  		ret = filemap_write_and_wait_range(inode->i_mapping,
2368  						   orig_pos, lend);
2369  		if (ret < 0)
2370  			goto out;
2371  	}
2372  
2373  	page = __page_cache_alloc(GFP_KERNEL);
2374  	if (page == NULL) {
2375  		ret = -ENOMEM;
2376  		goto out;
2377  	}
2378  
2379  	pagelist = ceph_pagelist_alloc(GFP_KERNEL);
2380  	if (!pagelist) {
2381  		ret = -ENOMEM;
2382  		goto out;
2383  	}
2384  
2385  	iov.iov_base = kmap_local_page(page);
2386  	iov.iov_len = len;
2387  	iov_iter_kvec(&iter, READ, &iov, 1, len);
2388  
2389  	pos = orig_pos;
2390  	ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
2391  	if (ret < 0)
2392  		goto out;
2393  
2394  	/* Insert the header first */
2395  	header.ver = 1;
2396  	header.compat = 1;
2397  	header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
2398  
2399  	/*
2400  	 * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
2401  	 * because in MDS it may need this to do the truncate.
2402  	 */
2403  	header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
2404  
2405  	/*
2406  	 * If we hit a hole here, we should just skip filling
2407  	 * the fscrypt for the request, because once the fscrypt
2408  	 * is enabled, the file will be split into many blocks
2409  	 * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
2410  	 * has a hole, the hole size should be multiple of block
2411  	 * size.
2412  	 *
2413  	 * If the Rados object doesn't exist, it will be set to 0.
2414  	 */
2415  	if (!objver) {
2416  		doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
2417  
2418  		header.data_len = cpu_to_le32(8 + 8 + 4);
2419  		header.file_offset = 0;
2420  		ret = 0;
2421  	} else {
2422  		header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
2423  		header.file_offset = cpu_to_le64(orig_pos);
2424  
2425  		doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
2426  		      CEPH_FSCRYPT_BLOCK_SIZE);
2427  
2428  		/* truncate and zero out the extra contents for the last block */
2429  		memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
2430  
2431  		/* encrypt the last block */
2432  		ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
2433  						    CEPH_FSCRYPT_BLOCK_SIZE,
2434  						    0, block,
2435  						    GFP_KERNEL);
2436  		if (ret)
2437  			goto out;
2438  	}
2439  
2440  	/* Insert the header */
2441  	ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
2442  	if (ret)
2443  		goto out;
2444  
2445  	if (header.block_size) {
2446  		/* Append the last block contents to pagelist */
2447  		ret = ceph_pagelist_append(pagelist, iov.iov_base,
2448  					   CEPH_FSCRYPT_BLOCK_SIZE);
2449  		if (ret)
2450  			goto out;
2451  	}
2452  	req->r_pagelist = pagelist;
2453  out:
2454  	doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
2455  	      ceph_vinop(inode), ceph_cap_string(got));
2456  	ceph_put_cap_refs(ci, got);
2457  	if (iov.iov_base)
2458  		kunmap_local(iov.iov_base);
2459  	if (page)
2460  		__free_pages(page, 0);
2461  	if (ret && pagelist)
2462  		ceph_pagelist_release(pagelist);
2463  	return ret;
2464  }
2465  
__ceph_setattr(struct mnt_idmap * idmap,struct inode * inode,struct iattr * attr,struct ceph_iattr * cia)2466  int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
2467  		   struct iattr *attr, struct ceph_iattr *cia)
2468  {
2469  	struct ceph_inode_info *ci = ceph_inode(inode);
2470  	unsigned int ia_valid = attr->ia_valid;
2471  	struct ceph_mds_request *req;
2472  	struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2473  	struct ceph_client *cl = ceph_inode_to_client(inode);
2474  	struct ceph_cap_flush *prealloc_cf;
2475  	loff_t isize = i_size_read(inode);
2476  	int issued;
2477  	int release = 0, dirtied = 0;
2478  	int mask = 0;
2479  	int err = 0;
2480  	int inode_dirty_flags = 0;
2481  	bool lock_snap_rwsem = false;
2482  	bool fill_fscrypt;
2483  	int truncate_retry = 20; /* The RMW will take around 50ms */
2484  	struct dentry *dentry;
2485  	char *path;
2486  	int pathlen;
2487  	u64 pathbase;
2488  	bool do_sync = false;
2489  
2490  	dentry = d_find_alias(inode);
2491  	if (!dentry) {
2492  		do_sync = true;
2493  	} else {
2494  		path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0);
2495  		if (IS_ERR(path)) {
2496  			do_sync = true;
2497  			err = 0;
2498  		} else {
2499  			err = ceph_mds_check_access(mdsc, path, MAY_WRITE);
2500  		}
2501  		ceph_mdsc_free_path(path, pathlen);
2502  		dput(dentry);
2503  
2504  		/* For none EACCES cases will let the MDS do the mds auth check */
2505  		if (err == -EACCES) {
2506  			return err;
2507  		} else if (err < 0) {
2508  			do_sync = true;
2509  			err = 0;
2510  		}
2511  	}
2512  
2513  retry:
2514  	prealloc_cf = ceph_alloc_cap_flush();
2515  	if (!prealloc_cf)
2516  		return -ENOMEM;
2517  
2518  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2519  				       USE_AUTH_MDS);
2520  	if (IS_ERR(req)) {
2521  		ceph_free_cap_flush(prealloc_cf);
2522  		return PTR_ERR(req);
2523  	}
2524  
2525  	fill_fscrypt = false;
2526  	spin_lock(&ci->i_ceph_lock);
2527  	issued = __ceph_caps_issued(ci, NULL);
2528  
2529  	if (!ci->i_head_snapc &&
2530  	    (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2531  		lock_snap_rwsem = true;
2532  		if (!down_read_trylock(&mdsc->snap_rwsem)) {
2533  			spin_unlock(&ci->i_ceph_lock);
2534  			down_read(&mdsc->snap_rwsem);
2535  			spin_lock(&ci->i_ceph_lock);
2536  			issued = __ceph_caps_issued(ci, NULL);
2537  		}
2538  	}
2539  
2540  	doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
2541  	      ceph_cap_string(issued));
2542  #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2543  	if (cia && cia->fscrypt_auth) {
2544  		u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
2545  
2546  		if (len > sizeof(*cia->fscrypt_auth)) {
2547  			err = -EINVAL;
2548  			spin_unlock(&ci->i_ceph_lock);
2549  			goto out;
2550  		}
2551  
2552  		doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
2553  		      ceph_vinop(inode), ci->fscrypt_auth_len, len);
2554  
2555  		/* It should never be re-set once set */
2556  		WARN_ON_ONCE(ci->fscrypt_auth);
2557  
2558  		if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2559  			dirtied |= CEPH_CAP_AUTH_EXCL;
2560  			kfree(ci->fscrypt_auth);
2561  			ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
2562  			ci->fscrypt_auth_len = len;
2563  		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2564  			   ci->fscrypt_auth_len != len ||
2565  			   memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
2566  			req->r_fscrypt_auth = cia->fscrypt_auth;
2567  			mask |= CEPH_SETATTR_FSCRYPT_AUTH;
2568  			release |= CEPH_CAP_AUTH_SHARED;
2569  		}
2570  		cia->fscrypt_auth = NULL;
2571  	}
2572  #else
2573  	if (cia && cia->fscrypt_auth) {
2574  		err = -EINVAL;
2575  		spin_unlock(&ci->i_ceph_lock);
2576  		goto out;
2577  	}
2578  #endif /* CONFIG_FS_ENCRYPTION */
2579  
2580  	if (ia_valid & ATTR_UID) {
2581  		kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);
2582  
2583  		doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
2584  		      ceph_vinop(inode),
2585  		      from_kuid(&init_user_ns, inode->i_uid),
2586  		      from_kuid(&init_user_ns, attr->ia_uid));
2587  		if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2588  			inode->i_uid = fsuid;
2589  			dirtied |= CEPH_CAP_AUTH_EXCL;
2590  		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2591  			   !uid_eq(fsuid, inode->i_uid)) {
2592  			req->r_args.setattr.uid = cpu_to_le32(
2593  				from_kuid(&init_user_ns, fsuid));
2594  			mask |= CEPH_SETATTR_UID;
2595  			release |= CEPH_CAP_AUTH_SHARED;
2596  		}
2597  	}
2598  	if (ia_valid & ATTR_GID) {
2599  		kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);
2600  
2601  		doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
2602  		      ceph_vinop(inode),
2603  		      from_kgid(&init_user_ns, inode->i_gid),
2604  		      from_kgid(&init_user_ns, attr->ia_gid));
2605  		if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2606  			inode->i_gid = fsgid;
2607  			dirtied |= CEPH_CAP_AUTH_EXCL;
2608  		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2609  			   !gid_eq(fsgid, inode->i_gid)) {
2610  			req->r_args.setattr.gid = cpu_to_le32(
2611  				from_kgid(&init_user_ns, fsgid));
2612  			mask |= CEPH_SETATTR_GID;
2613  			release |= CEPH_CAP_AUTH_SHARED;
2614  		}
2615  	}
2616  	if (ia_valid & ATTR_MODE) {
2617  		doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
2618  		      ceph_vinop(inode), inode->i_mode, attr->ia_mode);
2619  		if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2620  			inode->i_mode = attr->ia_mode;
2621  			dirtied |= CEPH_CAP_AUTH_EXCL;
2622  		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2623  			   attr->ia_mode != inode->i_mode) {
2624  			inode->i_mode = attr->ia_mode;
2625  			req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2626  			mask |= CEPH_SETATTR_MODE;
2627  			release |= CEPH_CAP_AUTH_SHARED;
2628  		}
2629  	}
2630  
2631  	if (ia_valid & ATTR_ATIME) {
2632  		struct timespec64 atime = inode_get_atime(inode);
2633  
2634  		doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n",
2635  		      inode, ceph_vinop(inode),
2636  		      atime.tv_sec, atime.tv_nsec,
2637  		      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2638  		if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) {
2639  			ci->i_time_warp_seq++;
2640  			inode_set_atime_to_ts(inode, attr->ia_atime);
2641  			dirtied |= CEPH_CAP_FILE_EXCL;
2642  		} else if (!do_sync && (issued & CEPH_CAP_FILE_WR) &&
2643  			   timespec64_compare(&atime,
2644  					      &attr->ia_atime) < 0) {
2645  			inode_set_atime_to_ts(inode, attr->ia_atime);
2646  			dirtied |= CEPH_CAP_FILE_WR;
2647  		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2648  			   !timespec64_equal(&atime, &attr->ia_atime)) {
2649  			ceph_encode_timespec64(&req->r_args.setattr.atime,
2650  					       &attr->ia_atime);
2651  			mask |= CEPH_SETATTR_ATIME;
2652  			release |= CEPH_CAP_FILE_SHARED |
2653  				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2654  		}
2655  	}
2656  	if (ia_valid & ATTR_SIZE) {
2657  		doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
2658  		      ceph_vinop(inode), isize, attr->ia_size);
2659  		/*
2660  		 * Only when the new size is smaller and not aligned to
2661  		 * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
2662  		 */
2663  		if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
2664  		    (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
2665  			mask |= CEPH_SETATTR_SIZE;
2666  			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2667  				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2668  			set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2669  			mask |= CEPH_SETATTR_FSCRYPT_FILE;
2670  			req->r_args.setattr.size =
2671  				cpu_to_le64(round_up(attr->ia_size,
2672  						     CEPH_FSCRYPT_BLOCK_SIZE));
2673  			req->r_args.setattr.old_size =
2674  				cpu_to_le64(round_up(isize,
2675  						     CEPH_FSCRYPT_BLOCK_SIZE));
2676  			req->r_fscrypt_file = attr->ia_size;
2677  			fill_fscrypt = true;
2678  		} else if (!do_sync && (issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2679  			if (attr->ia_size > isize) {
2680  				i_size_write(inode, attr->ia_size);
2681  				inode->i_blocks = calc_inode_blocks(attr->ia_size);
2682  				ci->i_reported_size = attr->ia_size;
2683  				dirtied |= CEPH_CAP_FILE_EXCL;
2684  				ia_valid |= ATTR_MTIME;
2685  			}
2686  		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2687  			   attr->ia_size != isize) {
2688  			mask |= CEPH_SETATTR_SIZE;
2689  			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2690  				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2691  			if (IS_ENCRYPTED(inode) && attr->ia_size) {
2692  				set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2693  				mask |= CEPH_SETATTR_FSCRYPT_FILE;
2694  				req->r_args.setattr.size =
2695  					cpu_to_le64(round_up(attr->ia_size,
2696  							     CEPH_FSCRYPT_BLOCK_SIZE));
2697  				req->r_args.setattr.old_size =
2698  					cpu_to_le64(round_up(isize,
2699  							     CEPH_FSCRYPT_BLOCK_SIZE));
2700  				req->r_fscrypt_file = attr->ia_size;
2701  			} else {
2702  				req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2703  				req->r_args.setattr.old_size = cpu_to_le64(isize);
2704  				req->r_fscrypt_file = 0;
2705  			}
2706  		}
2707  	}
2708  	if (ia_valid & ATTR_MTIME) {
2709  		struct timespec64 mtime = inode_get_mtime(inode);
2710  
2711  		doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n",
2712  		      inode, ceph_vinop(inode),
2713  		      mtime.tv_sec, mtime.tv_nsec,
2714  		      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2715  		if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) {
2716  			ci->i_time_warp_seq++;
2717  			inode_set_mtime_to_ts(inode, attr->ia_mtime);
2718  			dirtied |= CEPH_CAP_FILE_EXCL;
2719  		} else if (!do_sync && (issued & CEPH_CAP_FILE_WR) &&
2720  			   timespec64_compare(&mtime, &attr->ia_mtime) < 0) {
2721  			inode_set_mtime_to_ts(inode, attr->ia_mtime);
2722  			dirtied |= CEPH_CAP_FILE_WR;
2723  		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2724  			   !timespec64_equal(&mtime, &attr->ia_mtime)) {
2725  			ceph_encode_timespec64(&req->r_args.setattr.mtime,
2726  					       &attr->ia_mtime);
2727  			mask |= CEPH_SETATTR_MTIME;
2728  			release |= CEPH_CAP_FILE_SHARED |
2729  				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2730  		}
2731  	}
2732  
2733  	/* these do nothing */
2734  	if (ia_valid & ATTR_CTIME) {
2735  		bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2736  					 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2737  		doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n",
2738  		      inode, ceph_vinop(inode),
2739  		      inode_get_ctime_sec(inode),
2740  		      inode_get_ctime_nsec(inode),
2741  		      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2742  		      only ? "ctime only" : "ignored");
2743  		if (only) {
2744  			/*
2745  			 * if kernel wants to dirty ctime but nothing else,
2746  			 * we need to choose a cap to dirty under, or do
2747  			 * a almost-no-op setattr
2748  			 */
2749  			if (issued & CEPH_CAP_AUTH_EXCL)
2750  				dirtied |= CEPH_CAP_AUTH_EXCL;
2751  			else if (issued & CEPH_CAP_FILE_EXCL)
2752  				dirtied |= CEPH_CAP_FILE_EXCL;
2753  			else if (issued & CEPH_CAP_XATTR_EXCL)
2754  				dirtied |= CEPH_CAP_XATTR_EXCL;
2755  			else
2756  				mask |= CEPH_SETATTR_CTIME;
2757  		}
2758  	}
2759  	if (ia_valid & ATTR_FILE)
2760  		doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
2761  		      ceph_vinop(inode));
2762  
2763  	if (dirtied) {
2764  		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2765  							   &prealloc_cf);
2766  		inode_set_ctime_to_ts(inode, attr->ia_ctime);
2767  		inode_inc_iversion_raw(inode);
2768  	}
2769  
2770  	release &= issued;
2771  	spin_unlock(&ci->i_ceph_lock);
2772  	if (lock_snap_rwsem) {
2773  		up_read(&mdsc->snap_rwsem);
2774  		lock_snap_rwsem = false;
2775  	}
2776  
2777  	if (inode_dirty_flags)
2778  		__mark_inode_dirty(inode, inode_dirty_flags);
2779  
2780  	if (mask) {
2781  		req->r_inode = inode;
2782  		ihold(inode);
2783  		req->r_inode_drop = release;
2784  		req->r_args.setattr.mask = cpu_to_le32(mask);
2785  		req->r_num_caps = 1;
2786  		req->r_stamp = attr->ia_ctime;
2787  		if (fill_fscrypt) {
2788  			err = fill_fscrypt_truncate(inode, req, attr);
2789  			if (err)
2790  				goto out;
2791  		}
2792  
2793  		/*
2794  		 * The truncate request will return -EAGAIN when the
2795  		 * last block has been updated just before the MDS
2796  		 * successfully gets the xlock for the FILE lock. To
2797  		 * avoid corrupting the file contents we need to retry
2798  		 * it.
2799  		 */
2800  		err = ceph_mdsc_do_request(mdsc, NULL, req);
2801  		if (err == -EAGAIN && truncate_retry--) {
2802  			doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
2803  			      inode, ceph_vinop(inode), err,
2804  			      ceph_cap_string(dirtied), mask);
2805  			ceph_mdsc_put_request(req);
2806  			ceph_free_cap_flush(prealloc_cf);
2807  			goto retry;
2808  		}
2809  	}
2810  out:
2811  	doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
2812  	      ceph_vinop(inode), err, ceph_cap_string(dirtied), mask);
2813  
2814  	ceph_mdsc_put_request(req);
2815  	ceph_free_cap_flush(prealloc_cf);
2816  
2817  	if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2818  		__ceph_do_pending_vmtruncate(inode);
2819  
2820  	return err;
2821  }
2822  
2823  /*
2824   * setattr
2825   */
ceph_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)2826  int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2827  		 struct iattr *attr)
2828  {
2829  	struct inode *inode = d_inode(dentry);
2830  	struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2831  	int err;
2832  
2833  	if (ceph_snap(inode) != CEPH_NOSNAP)
2834  		return -EROFS;
2835  
2836  	if (ceph_inode_is_shutdown(inode))
2837  		return -ESTALE;
2838  
2839  	err = fscrypt_prepare_setattr(dentry, attr);
2840  	if (err)
2841  		return err;
2842  
2843  	err = setattr_prepare(idmap, dentry, attr);
2844  	if (err != 0)
2845  		return err;
2846  
2847  	if ((attr->ia_valid & ATTR_SIZE) &&
2848  	    attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2849  		return -EFBIG;
2850  
2851  	if ((attr->ia_valid & ATTR_SIZE) &&
2852  	    ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2853  		return -EDQUOT;
2854  
2855  	err = __ceph_setattr(idmap, inode, attr, NULL);
2856  
2857  	if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2858  		err = posix_acl_chmod(idmap, dentry, attr->ia_mode);
2859  
2860  	return err;
2861  }
2862  
ceph_try_to_choose_auth_mds(struct inode * inode,int mask)2863  int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2864  {
2865  	int issued = ceph_caps_issued(ceph_inode(inode));
2866  
2867  	/*
2868  	 * If any 'x' caps is issued we can just choose the auth MDS
2869  	 * instead of the random replica MDSes. Because only when the
2870  	 * Locker is in LOCK_EXEC state will the loner client could
2871  	 * get the 'x' caps. And if we send the getattr requests to
2872  	 * any replica MDS it must auth pin and tries to rdlock from
2873  	 * the auth MDS, and then the auth MDS need to do the Locker
2874  	 * state transition to LOCK_SYNC. And after that the lock state
2875  	 * will change back.
2876  	 *
2877  	 * This cost much when doing the Locker state transition and
2878  	 * usually will need to revoke caps from clients.
2879  	 *
2880  	 * And for the 'Xs' caps for getxattr we will also choose the
2881  	 * auth MDS, because the MDS side code is buggy due to setxattr
2882  	 * won't notify the replica MDSes when the values changed and
2883  	 * the replica MDS will return the old values. Though we will
2884  	 * fix it in MDS code, but this still makes sense for old ceph.
2885  	 */
2886  	if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2887  	    || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2888  		return USE_AUTH_MDS;
2889  	else
2890  		return USE_ANY_MDS;
2891  }
2892  
2893  /*
2894   * Verify that we have a lease on the given mask.  If not,
2895   * do a getattr against an mds.
2896   */
__ceph_do_getattr(struct inode * inode,struct page * locked_page,int mask,bool force)2897  int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2898  		      int mask, bool force)
2899  {
2900  	struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2901  	struct ceph_client *cl = fsc->client;
2902  	struct ceph_mds_client *mdsc = fsc->mdsc;
2903  	struct ceph_mds_request *req;
2904  	int mode;
2905  	int err;
2906  
2907  	if (ceph_snap(inode) == CEPH_SNAPDIR) {
2908  		doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
2909  		      ceph_vinop(inode));
2910  		return 0;
2911  	}
2912  
2913  	doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
2914  	      ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
2915  	if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2916  			return 0;
2917  
2918  	mode = ceph_try_to_choose_auth_mds(inode, mask);
2919  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2920  	if (IS_ERR(req))
2921  		return PTR_ERR(req);
2922  	req->r_inode = inode;
2923  	ihold(inode);
2924  	req->r_num_caps = 1;
2925  	req->r_args.getattr.mask = cpu_to_le32(mask);
2926  	req->r_locked_page = locked_page;
2927  	err = ceph_mdsc_do_request(mdsc, NULL, req);
2928  	if (locked_page && err == 0) {
2929  		u64 inline_version = req->r_reply_info.targeti.inline_version;
2930  		if (inline_version == 0) {
2931  			/* the reply is supposed to contain inline data */
2932  			err = -EINVAL;
2933  		} else if (inline_version == CEPH_INLINE_NONE ||
2934  			   inline_version == 1) {
2935  			err = -ENODATA;
2936  		} else {
2937  			err = req->r_reply_info.targeti.inline_len;
2938  		}
2939  	}
2940  	ceph_mdsc_put_request(req);
2941  	doutc(cl, "result=%d\n", err);
2942  	return err;
2943  }
2944  
ceph_do_getvxattr(struct inode * inode,const char * name,void * value,size_t size)2945  int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2946  		      size_t size)
2947  {
2948  	struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2949  	struct ceph_client *cl = fsc->client;
2950  	struct ceph_mds_client *mdsc = fsc->mdsc;
2951  	struct ceph_mds_request *req;
2952  	int mode = USE_AUTH_MDS;
2953  	int err;
2954  	char *xattr_value;
2955  	size_t xattr_value_len;
2956  
2957  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2958  	if (IS_ERR(req)) {
2959  		err = -ENOMEM;
2960  		goto out;
2961  	}
2962  
2963  	req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2964  	req->r_path2 = kstrdup(name, GFP_NOFS);
2965  	if (!req->r_path2) {
2966  		err = -ENOMEM;
2967  		goto put;
2968  	}
2969  
2970  	ihold(inode);
2971  	req->r_inode = inode;
2972  	err = ceph_mdsc_do_request(mdsc, NULL, req);
2973  	if (err < 0)
2974  		goto put;
2975  
2976  	xattr_value = req->r_reply_info.xattr_info.xattr_value;
2977  	xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2978  
2979  	doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2980  
2981  	err = (int)xattr_value_len;
2982  	if (size == 0)
2983  		goto put;
2984  
2985  	if (xattr_value_len > size) {
2986  		err = -ERANGE;
2987  		goto put;
2988  	}
2989  
2990  	memcpy(value, xattr_value, xattr_value_len);
2991  put:
2992  	ceph_mdsc_put_request(req);
2993  out:
2994  	doutc(cl, "result=%d\n", err);
2995  	return err;
2996  }
2997  
2998  
2999  /*
3000   * Check inode permissions.  We verify we have a valid value for
3001   * the AUTH cap, then call the generic handler.
3002   */
ceph_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)3003  int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
3004  		    int mask)
3005  {
3006  	int err;
3007  
3008  	if (mask & MAY_NOT_BLOCK)
3009  		return -ECHILD;
3010  
3011  	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
3012  
3013  	if (!err)
3014  		err = generic_permission(idmap, inode, mask);
3015  	return err;
3016  }
3017  
3018  /* Craft a mask of needed caps given a set of requested statx attrs. */
statx_to_caps(u32 want,umode_t mode)3019  static int statx_to_caps(u32 want, umode_t mode)
3020  {
3021  	int mask = 0;
3022  
3023  	if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
3024  		mask |= CEPH_CAP_AUTH_SHARED;
3025  
3026  	if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
3027  		/*
3028  		 * The link count for directories depends on inode->i_subdirs,
3029  		 * and that is only updated when Fs caps are held.
3030  		 */
3031  		if (S_ISDIR(mode))
3032  			mask |= CEPH_CAP_FILE_SHARED;
3033  		else
3034  			mask |= CEPH_CAP_LINK_SHARED;
3035  	}
3036  
3037  	if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
3038  		mask |= CEPH_CAP_FILE_SHARED;
3039  
3040  	if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
3041  		mask |= CEPH_CAP_XATTR_SHARED;
3042  
3043  	return mask;
3044  }
3045  
3046  /*
3047   * Get all the attributes. If we have sufficient caps for the requested attrs,
3048   * then we can avoid talking to the MDS at all.
3049   */
ceph_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)3050  int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
3051  		 struct kstat *stat, u32 request_mask, unsigned int flags)
3052  {
3053  	struct inode *inode = d_inode(path->dentry);
3054  	struct super_block *sb = inode->i_sb;
3055  	struct ceph_inode_info *ci = ceph_inode(inode);
3056  	u32 valid_mask = STATX_BASIC_STATS;
3057  	int err = 0;
3058  
3059  	if (ceph_inode_is_shutdown(inode))
3060  		return -ESTALE;
3061  
3062  	/* Skip the getattr altogether if we're asked not to sync */
3063  	if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
3064  		err = ceph_do_getattr(inode,
3065  				statx_to_caps(request_mask, inode->i_mode),
3066  				flags & AT_STATX_FORCE_SYNC);
3067  		if (err)
3068  			return err;
3069  	}
3070  
3071  	generic_fillattr(idmap, request_mask, inode, stat);
3072  	stat->ino = ceph_present_inode(inode);
3073  
3074  	/*
3075  	 * btime on newly-allocated inodes is 0, so if this is still set to
3076  	 * that, then assume that it's not valid.
3077  	 */
3078  	if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
3079  		stat->btime = ci->i_btime;
3080  		valid_mask |= STATX_BTIME;
3081  	}
3082  
3083  	if (request_mask & STATX_CHANGE_COOKIE) {
3084  		stat->change_cookie = inode_peek_iversion_raw(inode);
3085  		valid_mask |= STATX_CHANGE_COOKIE;
3086  	}
3087  
3088  	if (ceph_snap(inode) == CEPH_NOSNAP)
3089  		stat->dev = sb->s_dev;
3090  	else
3091  		stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
3092  
3093  	if (S_ISDIR(inode->i_mode)) {
3094  		if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) {
3095  			stat->size = ci->i_rbytes;
3096  		} else if (ceph_snap(inode) == CEPH_SNAPDIR) {
3097  			struct ceph_inode_info *pci;
3098  			struct ceph_snap_realm *realm;
3099  			struct inode *parent;
3100  
3101  			parent = ceph_lookup_inode(sb, ceph_ino(inode));
3102  			if (IS_ERR(parent))
3103  				return PTR_ERR(parent);
3104  
3105  			pci = ceph_inode(parent);
3106  			spin_lock(&pci->i_ceph_lock);
3107  			realm = pci->i_snap_realm;
3108  			if (realm)
3109  				stat->size = realm->num_snaps;
3110  			else
3111  				stat->size = 0;
3112  			spin_unlock(&pci->i_ceph_lock);
3113  			iput(parent);
3114  		} else {
3115  			stat->size = ci->i_files + ci->i_subdirs;
3116  		}
3117  		stat->blocks = 0;
3118  		stat->blksize = 65536;
3119  		/*
3120  		 * Some applications rely on the number of st_nlink
3121  		 * value on directories to be either 0 (if unlinked)
3122  		 * or 2 + number of subdirectories.
3123  		 */
3124  		if (stat->nlink == 1)
3125  			/* '.' + '..' + subdirs */
3126  			stat->nlink = 1 + 1 + ci->i_subdirs;
3127  	}
3128  
3129  	stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
3130  	if (IS_ENCRYPTED(inode))
3131  		stat->attributes |= STATX_ATTR_ENCRYPTED;
3132  	stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
3133  				  STATX_ATTR_ENCRYPTED);
3134  
3135  	stat->result_mask = request_mask & valid_mask;
3136  	return err;
3137  }
3138  
ceph_inode_shutdown(struct inode * inode)3139  void ceph_inode_shutdown(struct inode *inode)
3140  {
3141  	struct ceph_inode_info *ci = ceph_inode(inode);
3142  	struct rb_node *p;
3143  	int iputs = 0;
3144  	bool invalidate = false;
3145  
3146  	spin_lock(&ci->i_ceph_lock);
3147  	ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
3148  	p = rb_first(&ci->i_caps);
3149  	while (p) {
3150  		struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
3151  
3152  		p = rb_next(p);
3153  		iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
3154  	}
3155  	spin_unlock(&ci->i_ceph_lock);
3156  
3157  	if (invalidate)
3158  		ceph_queue_invalidate(inode);
3159  	while (iputs--)
3160  		iput(inode);
3161  }
3162