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[linux-3.10.git] / fs / ceph / inode.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/pagevec.h>
13
14 #include "super.h"
15 #include "mds_client.h"
16 #include <linux/ceph/decode.h>
17
18 /*
19  * Ceph inode operations
20  *
21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
22  * setattr, etc.), xattr helpers, and helpers for assimilating
23  * metadata returned by the MDS into our cache.
24  *
25  * Also define helpers for doing asynchronous writeback, invalidation,
26  * and truncation for the benefit of those who can't afford to block
27  * (typically because they are in the message handler path).
28  */
29
30 static const struct inode_operations ceph_symlink_iops;
31
32 static void ceph_invalidate_work(struct work_struct *work);
33 static void ceph_writeback_work(struct work_struct *work);
34 static void ceph_vmtruncate_work(struct work_struct *work);
35
36 /*
37  * find or create an inode, given the ceph ino number
38  */
39 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
40 {
41         struct inode *inode;
42         ino_t t = ceph_vino_to_ino(vino);
43
44         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
45         if (inode == NULL)
46                 return ERR_PTR(-ENOMEM);
47         if (inode->i_state & I_NEW) {
48                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
49                      inode, ceph_vinop(inode), (u64)inode->i_ino);
50                 unlock_new_inode(inode);
51         }
52
53         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
54              vino.snap, inode);
55         return inode;
56 }
57
58 /*
59  * get/constuct snapdir inode for a given directory
60  */
61 struct inode *ceph_get_snapdir(struct inode *parent)
62 {
63         struct ceph_vino vino = {
64                 .ino = ceph_ino(parent),
65                 .snap = CEPH_SNAPDIR,
66         };
67         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
68         struct ceph_inode_info *ci = ceph_inode(inode);
69
70         BUG_ON(!S_ISDIR(parent->i_mode));
71         if (IS_ERR(inode))
72                 return inode;
73         inode->i_mode = parent->i_mode;
74         inode->i_uid = parent->i_uid;
75         inode->i_gid = parent->i_gid;
76         inode->i_op = &ceph_dir_iops;
77         inode->i_fop = &ceph_dir_fops;
78         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
79         ci->i_rbytes = 0;
80         return inode;
81 }
82
83 const struct inode_operations ceph_file_iops = {
84         .permission = ceph_permission,
85         .setattr = ceph_setattr,
86         .getattr = ceph_getattr,
87         .setxattr = ceph_setxattr,
88         .getxattr = ceph_getxattr,
89         .listxattr = ceph_listxattr,
90         .removexattr = ceph_removexattr,
91 };
92
93
94 /*
95  * We use a 'frag tree' to keep track of the MDS's directory fragments
96  * for a given inode (usually there is just a single fragment).  We
97  * need to know when a child frag is delegated to a new MDS, or when
98  * it is flagged as replicated, so we can direct our requests
99  * accordingly.
100  */
101
102 /*
103  * find/create a frag in the tree
104  */
105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
106                                                     u32 f)
107 {
108         struct rb_node **p;
109         struct rb_node *parent = NULL;
110         struct ceph_inode_frag *frag;
111         int c;
112
113         p = &ci->i_fragtree.rb_node;
114         while (*p) {
115                 parent = *p;
116                 frag = rb_entry(parent, struct ceph_inode_frag, node);
117                 c = ceph_frag_compare(f, frag->frag);
118                 if (c < 0)
119                         p = &(*p)->rb_left;
120                 else if (c > 0)
121                         p = &(*p)->rb_right;
122                 else
123                         return frag;
124         }
125
126         frag = kmalloc(sizeof(*frag), GFP_NOFS);
127         if (!frag) {
128                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
129                        "frag %x\n", &ci->vfs_inode,
130                        ceph_vinop(&ci->vfs_inode), f);
131                 return ERR_PTR(-ENOMEM);
132         }
133         frag->frag = f;
134         frag->split_by = 0;
135         frag->mds = -1;
136         frag->ndist = 0;
137
138         rb_link_node(&frag->node, parent, p);
139         rb_insert_color(&frag->node, &ci->i_fragtree);
140
141         dout("get_or_create_frag added %llx.%llx frag %x\n",
142              ceph_vinop(&ci->vfs_inode), f);
143         return frag;
144 }
145
146 /*
147  * find a specific frag @f
148  */
149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
150 {
151         struct rb_node *n = ci->i_fragtree.rb_node;
152
153         while (n) {
154                 struct ceph_inode_frag *frag =
155                         rb_entry(n, struct ceph_inode_frag, node);
156                 int c = ceph_frag_compare(f, frag->frag);
157                 if (c < 0)
158                         n = n->rb_left;
159                 else if (c > 0)
160                         n = n->rb_right;
161                 else
162                         return frag;
163         }
164         return NULL;
165 }
166
167 /*
168  * Choose frag containing the given value @v.  If @pfrag is
169  * specified, copy the frag delegation info to the caller if
170  * it is present.
171  */
172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
173                      struct ceph_inode_frag *pfrag,
174                      int *found)
175 {
176         u32 t = ceph_frag_make(0, 0);
177         struct ceph_inode_frag *frag;
178         unsigned nway, i;
179         u32 n;
180
181         if (found)
182                 *found = 0;
183
184         mutex_lock(&ci->i_fragtree_mutex);
185         while (1) {
186                 WARN_ON(!ceph_frag_contains_value(t, v));
187                 frag = __ceph_find_frag(ci, t);
188                 if (!frag)
189                         break; /* t is a leaf */
190                 if (frag->split_by == 0) {
191                         if (pfrag)
192                                 memcpy(pfrag, frag, sizeof(*pfrag));
193                         if (found)
194                                 *found = 1;
195                         break;
196                 }
197
198                 /* choose child */
199                 nway = 1 << frag->split_by;
200                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
201                      frag->split_by, nway);
202                 for (i = 0; i < nway; i++) {
203                         n = ceph_frag_make_child(t, frag->split_by, i);
204                         if (ceph_frag_contains_value(n, v)) {
205                                 t = n;
206                                 break;
207                         }
208                 }
209                 BUG_ON(i == nway);
210         }
211         dout("choose_frag(%x) = %x\n", v, t);
212
213         mutex_unlock(&ci->i_fragtree_mutex);
214         return t;
215 }
216
217 /*
218  * Process dirfrag (delegation) info from the mds.  Include leaf
219  * fragment in tree ONLY if ndist > 0.  Otherwise, only
220  * branches/splits are included in i_fragtree)
221  */
222 static int ceph_fill_dirfrag(struct inode *inode,
223                              struct ceph_mds_reply_dirfrag *dirinfo)
224 {
225         struct ceph_inode_info *ci = ceph_inode(inode);
226         struct ceph_inode_frag *frag;
227         u32 id = le32_to_cpu(dirinfo->frag);
228         int mds = le32_to_cpu(dirinfo->auth);
229         int ndist = le32_to_cpu(dirinfo->ndist);
230         int i;
231         int err = 0;
232
233         mutex_lock(&ci->i_fragtree_mutex);
234         if (ndist == 0) {
235                 /* no delegation info needed. */
236                 frag = __ceph_find_frag(ci, id);
237                 if (!frag)
238                         goto out;
239                 if (frag->split_by == 0) {
240                         /* tree leaf, remove */
241                         dout("fill_dirfrag removed %llx.%llx frag %x"
242                              " (no ref)\n", ceph_vinop(inode), id);
243                         rb_erase(&frag->node, &ci->i_fragtree);
244                         kfree(frag);
245                 } else {
246                         /* tree branch, keep and clear */
247                         dout("fill_dirfrag cleared %llx.%llx frag %x"
248                              " referral\n", ceph_vinop(inode), id);
249                         frag->mds = -1;
250                         frag->ndist = 0;
251                 }
252                 goto out;
253         }
254
255
256         /* find/add this frag to store mds delegation info */
257         frag = __get_or_create_frag(ci, id);
258         if (IS_ERR(frag)) {
259                 /* this is not the end of the world; we can continue
260                    with bad/inaccurate delegation info */
261                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
262                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
263                 err = -ENOMEM;
264                 goto out;
265         }
266
267         frag->mds = mds;
268         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
269         for (i = 0; i < frag->ndist; i++)
270                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
271         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
272              ceph_vinop(inode), frag->frag, frag->ndist);
273
274 out:
275         mutex_unlock(&ci->i_fragtree_mutex);
276         return err;
277 }
278
279
280 /*
281  * initialize a newly allocated inode.
282  */
283 struct inode *ceph_alloc_inode(struct super_block *sb)
284 {
285         struct ceph_inode_info *ci;
286         int i;
287
288         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
289         if (!ci)
290                 return NULL;
291
292         dout("alloc_inode %p\n", &ci->vfs_inode);
293
294         ci->i_version = 0;
295         ci->i_time_warp_seq = 0;
296         ci->i_ceph_flags = 0;
297         ci->i_release_count = 0;
298         ci->i_symlink = NULL;
299
300         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
301
302         ci->i_fragtree = RB_ROOT;
303         mutex_init(&ci->i_fragtree_mutex);
304
305         ci->i_xattrs.blob = NULL;
306         ci->i_xattrs.prealloc_blob = NULL;
307         ci->i_xattrs.dirty = false;
308         ci->i_xattrs.index = RB_ROOT;
309         ci->i_xattrs.count = 0;
310         ci->i_xattrs.names_size = 0;
311         ci->i_xattrs.vals_size = 0;
312         ci->i_xattrs.version = 0;
313         ci->i_xattrs.index_version = 0;
314
315         ci->i_caps = RB_ROOT;
316         ci->i_auth_cap = NULL;
317         ci->i_dirty_caps = 0;
318         ci->i_flushing_caps = 0;
319         INIT_LIST_HEAD(&ci->i_dirty_item);
320         INIT_LIST_HEAD(&ci->i_flushing_item);
321         ci->i_cap_flush_seq = 0;
322         ci->i_cap_flush_last_tid = 0;
323         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
324         init_waitqueue_head(&ci->i_cap_wq);
325         ci->i_hold_caps_min = 0;
326         ci->i_hold_caps_max = 0;
327         INIT_LIST_HEAD(&ci->i_cap_delay_list);
328         ci->i_cap_exporting_mds = 0;
329         ci->i_cap_exporting_mseq = 0;
330         ci->i_cap_exporting_issued = 0;
331         INIT_LIST_HEAD(&ci->i_cap_snaps);
332         ci->i_head_snapc = NULL;
333         ci->i_snap_caps = 0;
334
335         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
336                 ci->i_nr_by_mode[i] = 0;
337
338         ci->i_truncate_seq = 0;
339         ci->i_truncate_size = 0;
340         ci->i_truncate_pending = 0;
341
342         ci->i_max_size = 0;
343         ci->i_reported_size = 0;
344         ci->i_wanted_max_size = 0;
345         ci->i_requested_max_size = 0;
346
347         ci->i_pin_ref = 0;
348         ci->i_rd_ref = 0;
349         ci->i_rdcache_ref = 0;
350         ci->i_wr_ref = 0;
351         ci->i_wrbuffer_ref = 0;
352         ci->i_wrbuffer_ref_head = 0;
353         ci->i_shared_gen = 0;
354         ci->i_rdcache_gen = 0;
355         ci->i_rdcache_revoking = 0;
356
357         INIT_LIST_HEAD(&ci->i_unsafe_writes);
358         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
359         spin_lock_init(&ci->i_unsafe_lock);
360
361         ci->i_snap_realm = NULL;
362         INIT_LIST_HEAD(&ci->i_snap_realm_item);
363         INIT_LIST_HEAD(&ci->i_snap_flush_item);
364
365         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
366         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
367
368         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
369
370         return &ci->vfs_inode;
371 }
372
373 void ceph_destroy_inode(struct inode *inode)
374 {
375         struct ceph_inode_info *ci = ceph_inode(inode);
376         struct ceph_inode_frag *frag;
377         struct rb_node *n;
378
379         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
380
381         ceph_queue_caps_release(inode);
382
383         /*
384          * we may still have a snap_realm reference if there are stray
385          * caps in i_cap_exporting_issued or i_snap_caps.
386          */
387         if (ci->i_snap_realm) {
388                 struct ceph_mds_client *mdsc =
389                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
390                 struct ceph_snap_realm *realm = ci->i_snap_realm;
391
392                 dout(" dropping residual ref to snap realm %p\n", realm);
393                 spin_lock(&realm->inodes_with_caps_lock);
394                 list_del_init(&ci->i_snap_realm_item);
395                 spin_unlock(&realm->inodes_with_caps_lock);
396                 ceph_put_snap_realm(mdsc, realm);
397         }
398
399         kfree(ci->i_symlink);
400         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
401                 frag = rb_entry(n, struct ceph_inode_frag, node);
402                 rb_erase(n, &ci->i_fragtree);
403                 kfree(frag);
404         }
405
406         __ceph_destroy_xattrs(ci);
407         if (ci->i_xattrs.blob)
408                 ceph_buffer_put(ci->i_xattrs.blob);
409         if (ci->i_xattrs.prealloc_blob)
410                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
411
412         kmem_cache_free(ceph_inode_cachep, ci);
413 }
414
415
416 /*
417  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
418  * careful because either the client or MDS may have more up to date
419  * info, depending on which capabilities are held, and whether
420  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
421  * and size are monotonically increasing, except when utimes() or
422  * truncate() increments the corresponding _seq values.)
423  */
424 int ceph_fill_file_size(struct inode *inode, int issued,
425                         u32 truncate_seq, u64 truncate_size, u64 size)
426 {
427         struct ceph_inode_info *ci = ceph_inode(inode);
428         int queue_trunc = 0;
429
430         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
431             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
432                 dout("size %lld -> %llu\n", inode->i_size, size);
433                 inode->i_size = size;
434                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
435                 ci->i_reported_size = size;
436                 if (truncate_seq != ci->i_truncate_seq) {
437                         dout("truncate_seq %u -> %u\n",
438                              ci->i_truncate_seq, truncate_seq);
439                         ci->i_truncate_seq = truncate_seq;
440                         /*
441                          * If we hold relevant caps, or in the case where we're
442                          * not the only client referencing this file and we
443                          * don't hold those caps, then we need to check whether
444                          * the file is either opened or mmaped
445                          */
446                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
447                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
448                                        CEPH_CAP_FILE_EXCL|
449                                        CEPH_CAP_FILE_LAZYIO)) ||
450                             mapping_mapped(inode->i_mapping) ||
451                             __ceph_caps_file_wanted(ci)) {
452                                 ci->i_truncate_pending++;
453                                 queue_trunc = 1;
454                         }
455                 }
456         }
457         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
458             ci->i_truncate_size != truncate_size) {
459                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
460                      truncate_size);
461                 ci->i_truncate_size = truncate_size;
462         }
463         return queue_trunc;
464 }
465
466 void ceph_fill_file_time(struct inode *inode, int issued,
467                          u64 time_warp_seq, struct timespec *ctime,
468                          struct timespec *mtime, struct timespec *atime)
469 {
470         struct ceph_inode_info *ci = ceph_inode(inode);
471         int warn = 0;
472
473         if (issued & (CEPH_CAP_FILE_EXCL|
474                       CEPH_CAP_FILE_WR|
475                       CEPH_CAP_FILE_BUFFER|
476                       CEPH_CAP_AUTH_EXCL|
477                       CEPH_CAP_XATTR_EXCL)) {
478                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
479                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
480                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
481                              ctime->tv_sec, ctime->tv_nsec);
482                         inode->i_ctime = *ctime;
483                 }
484                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
485                         /* the MDS did a utimes() */
486                         dout("mtime %ld.%09ld -> %ld.%09ld "
487                              "tw %d -> %d\n",
488                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
489                              mtime->tv_sec, mtime->tv_nsec,
490                              ci->i_time_warp_seq, (int)time_warp_seq);
491
492                         inode->i_mtime = *mtime;
493                         inode->i_atime = *atime;
494                         ci->i_time_warp_seq = time_warp_seq;
495                 } else if (time_warp_seq == ci->i_time_warp_seq) {
496                         /* nobody did utimes(); take the max */
497                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
498                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
499                                      inode->i_mtime.tv_sec,
500                                      inode->i_mtime.tv_nsec,
501                                      mtime->tv_sec, mtime->tv_nsec);
502                                 inode->i_mtime = *mtime;
503                         }
504                         if (timespec_compare(atime, &inode->i_atime) > 0) {
505                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
506                                      inode->i_atime.tv_sec,
507                                      inode->i_atime.tv_nsec,
508                                      atime->tv_sec, atime->tv_nsec);
509                                 inode->i_atime = *atime;
510                         }
511                 } else if (issued & CEPH_CAP_FILE_EXCL) {
512                         /* we did a utimes(); ignore mds values */
513                 } else {
514                         warn = 1;
515                 }
516         } else {
517                 /* we have no write|excl caps; whatever the MDS says is true */
518                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
519                         inode->i_ctime = *ctime;
520                         inode->i_mtime = *mtime;
521                         inode->i_atime = *atime;
522                         ci->i_time_warp_seq = time_warp_seq;
523                 } else {
524                         warn = 1;
525                 }
526         }
527         if (warn) /* time_warp_seq shouldn't go backwards */
528                 dout("%p mds time_warp_seq %llu < %u\n",
529                      inode, time_warp_seq, ci->i_time_warp_seq);
530 }
531
532 /*
533  * Populate an inode based on info from mds.  May be called on new or
534  * existing inodes.
535  */
536 static int fill_inode(struct inode *inode,
537                       struct ceph_mds_reply_info_in *iinfo,
538                       struct ceph_mds_reply_dirfrag *dirinfo,
539                       struct ceph_mds_session *session,
540                       unsigned long ttl_from, int cap_fmode,
541                       struct ceph_cap_reservation *caps_reservation)
542 {
543         struct ceph_mds_reply_inode *info = iinfo->in;
544         struct ceph_inode_info *ci = ceph_inode(inode);
545         int i;
546         int issued, implemented;
547         struct timespec mtime, atime, ctime;
548         u32 nsplits;
549         struct ceph_buffer *xattr_blob = NULL;
550         int err = 0;
551         int queue_trunc = 0;
552
553         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
554              inode, ceph_vinop(inode), le64_to_cpu(info->version),
555              ci->i_version);
556
557         /*
558          * prealloc xattr data, if it looks like we'll need it.  only
559          * if len > 4 (meaning there are actually xattrs; the first 4
560          * bytes are the xattr count).
561          */
562         if (iinfo->xattr_len > 4) {
563                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
564                 if (!xattr_blob)
565                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
566                                iinfo->xattr_len);
567         }
568
569         spin_lock(&inode->i_lock);
570
571         /*
572          * provided version will be odd if inode value is projected,
573          * even if stable.  skip the update if we have newer stable
574          * info (ours>=theirs, e.g. due to racing mds replies), unless
575          * we are getting projected (unstable) info (in which case the
576          * version is odd, and we want ours>theirs).
577          *   us   them
578          *   2    2     skip
579          *   3    2     skip
580          *   3    3     update
581          */
582         if (le64_to_cpu(info->version) > 0 &&
583             (ci->i_version & ~1) >= le64_to_cpu(info->version))
584                 goto no_change;
585
586         issued = __ceph_caps_issued(ci, &implemented);
587         issued |= implemented | __ceph_caps_dirty(ci);
588
589         /* update inode */
590         ci->i_version = le64_to_cpu(info->version);
591         inode->i_version++;
592         inode->i_rdev = le32_to_cpu(info->rdev);
593
594         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
595                 inode->i_mode = le32_to_cpu(info->mode);
596                 inode->i_uid = le32_to_cpu(info->uid);
597                 inode->i_gid = le32_to_cpu(info->gid);
598                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
599                      inode->i_uid, inode->i_gid);
600         }
601
602         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
603                 inode->i_nlink = le32_to_cpu(info->nlink);
604
605         /* be careful with mtime, atime, size */
606         ceph_decode_timespec(&atime, &info->atime);
607         ceph_decode_timespec(&mtime, &info->mtime);
608         ceph_decode_timespec(&ctime, &info->ctime);
609         queue_trunc = ceph_fill_file_size(inode, issued,
610                                           le32_to_cpu(info->truncate_seq),
611                                           le64_to_cpu(info->truncate_size),
612                                           le64_to_cpu(info->size));
613         ceph_fill_file_time(inode, issued,
614                             le32_to_cpu(info->time_warp_seq),
615                             &ctime, &mtime, &atime);
616
617         /* only update max_size on auth cap */
618         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
619             ci->i_max_size != le64_to_cpu(info->max_size)) {
620                 dout("max_size %lld -> %llu\n", ci->i_max_size,
621                      le64_to_cpu(info->max_size));
622                 ci->i_max_size = le64_to_cpu(info->max_size);
623         }
624
625         ci->i_layout = info->layout;
626         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
627
628         /* xattrs */
629         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
630         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
631             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
632                 if (ci->i_xattrs.blob)
633                         ceph_buffer_put(ci->i_xattrs.blob);
634                 ci->i_xattrs.blob = xattr_blob;
635                 if (xattr_blob)
636                         memcpy(ci->i_xattrs.blob->vec.iov_base,
637                                iinfo->xattr_data, iinfo->xattr_len);
638                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
639                 xattr_blob = NULL;
640         }
641
642         inode->i_mapping->a_ops = &ceph_aops;
643         inode->i_mapping->backing_dev_info =
644                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
645
646         switch (inode->i_mode & S_IFMT) {
647         case S_IFIFO:
648         case S_IFBLK:
649         case S_IFCHR:
650         case S_IFSOCK:
651                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
652                 inode->i_op = &ceph_file_iops;
653                 break;
654         case S_IFREG:
655                 inode->i_op = &ceph_file_iops;
656                 inode->i_fop = &ceph_file_fops;
657                 break;
658         case S_IFLNK:
659                 inode->i_op = &ceph_symlink_iops;
660                 if (!ci->i_symlink) {
661                         int symlen = iinfo->symlink_len;
662                         char *sym;
663
664                         BUG_ON(symlen != inode->i_size);
665                         spin_unlock(&inode->i_lock);
666
667                         err = -ENOMEM;
668                         sym = kmalloc(symlen+1, GFP_NOFS);
669                         if (!sym)
670                                 goto out;
671                         memcpy(sym, iinfo->symlink, symlen);
672                         sym[symlen] = 0;
673
674                         spin_lock(&inode->i_lock);
675                         if (!ci->i_symlink)
676                                 ci->i_symlink = sym;
677                         else
678                                 kfree(sym); /* lost a race */
679                 }
680                 break;
681         case S_IFDIR:
682                 inode->i_op = &ceph_dir_iops;
683                 inode->i_fop = &ceph_dir_fops;
684
685                 ci->i_dir_layout = iinfo->dir_layout;
686
687                 ci->i_files = le64_to_cpu(info->files);
688                 ci->i_subdirs = le64_to_cpu(info->subdirs);
689                 ci->i_rbytes = le64_to_cpu(info->rbytes);
690                 ci->i_rfiles = le64_to_cpu(info->rfiles);
691                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
692                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
693
694                 /* set dir completion flag? */
695                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
696                     ceph_snap(inode) == CEPH_NOSNAP &&
697                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
698                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
699                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
700                         dout(" marking %p complete (empty)\n", inode);
701                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
702                         ci->i_max_offset = 2;
703                 }
704                 break;
705         default:
706                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
707                        ceph_vinop(inode), inode->i_mode);
708         }
709
710 no_change:
711         spin_unlock(&inode->i_lock);
712
713         /* queue truncate if we saw i_size decrease */
714         if (queue_trunc)
715                 ceph_queue_vmtruncate(inode);
716
717         /* populate frag tree */
718         /* FIXME: move me up, if/when version reflects fragtree changes */
719         nsplits = le32_to_cpu(info->fragtree.nsplits);
720         mutex_lock(&ci->i_fragtree_mutex);
721         for (i = 0; i < nsplits; i++) {
722                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
723                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
724
725                 if (IS_ERR(frag))
726                         continue;
727                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
728                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
729         }
730         mutex_unlock(&ci->i_fragtree_mutex);
731
732         /* were we issued a capability? */
733         if (info->cap.caps) {
734                 if (ceph_snap(inode) == CEPH_NOSNAP) {
735                         ceph_add_cap(inode, session,
736                                      le64_to_cpu(info->cap.cap_id),
737                                      cap_fmode,
738                                      le32_to_cpu(info->cap.caps),
739                                      le32_to_cpu(info->cap.wanted),
740                                      le32_to_cpu(info->cap.seq),
741                                      le32_to_cpu(info->cap.mseq),
742                                      le64_to_cpu(info->cap.realm),
743                                      info->cap.flags,
744                                      caps_reservation);
745                 } else {
746                         spin_lock(&inode->i_lock);
747                         dout(" %p got snap_caps %s\n", inode,
748                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
749                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
750                         if (cap_fmode >= 0)
751                                 __ceph_get_fmode(ci, cap_fmode);
752                         spin_unlock(&inode->i_lock);
753                 }
754         } else if (cap_fmode >= 0) {
755                 pr_warning("mds issued no caps on %llx.%llx\n",
756                            ceph_vinop(inode));
757                 __ceph_get_fmode(ci, cap_fmode);
758         }
759
760         /* update delegation info? */
761         if (dirinfo)
762                 ceph_fill_dirfrag(inode, dirinfo);
763
764         err = 0;
765
766 out:
767         if (xattr_blob)
768                 ceph_buffer_put(xattr_blob);
769         return err;
770 }
771
772 /*
773  * caller should hold session s_mutex.
774  */
775 static void update_dentry_lease(struct dentry *dentry,
776                                 struct ceph_mds_reply_lease *lease,
777                                 struct ceph_mds_session *session,
778                                 unsigned long from_time)
779 {
780         struct ceph_dentry_info *di = ceph_dentry(dentry);
781         long unsigned duration = le32_to_cpu(lease->duration_ms);
782         long unsigned ttl = from_time + (duration * HZ) / 1000;
783         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
784         struct inode *dir;
785
786         /* only track leases on regular dentries */
787         if (dentry->d_op != &ceph_dentry_ops)
788                 return;
789
790         spin_lock(&dentry->d_lock);
791         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
792              dentry, le16_to_cpu(lease->mask), duration, ttl);
793
794         /* make lease_rdcache_gen match directory */
795         dir = dentry->d_parent->d_inode;
796         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
797
798         if (lease->mask == 0)
799                 goto out_unlock;
800
801         if (di->lease_gen == session->s_cap_gen &&
802             time_before(ttl, dentry->d_time))
803                 goto out_unlock;  /* we already have a newer lease. */
804
805         if (di->lease_session && di->lease_session != session)
806                 goto out_unlock;
807
808         ceph_dentry_lru_touch(dentry);
809
810         if (!di->lease_session)
811                 di->lease_session = ceph_get_mds_session(session);
812         di->lease_gen = session->s_cap_gen;
813         di->lease_seq = le32_to_cpu(lease->seq);
814         di->lease_renew_after = half_ttl;
815         di->lease_renew_from = 0;
816         dentry->d_time = ttl;
817 out_unlock:
818         spin_unlock(&dentry->d_lock);
819         return;
820 }
821
822 /*
823  * Set dentry's directory position based on the current dir's max, and
824  * order it in d_subdirs, so that dcache_readdir behaves.
825  */
826 static void ceph_set_dentry_offset(struct dentry *dn)
827 {
828         struct dentry *dir = dn->d_parent;
829         struct inode *inode = dn->d_parent->d_inode;
830         struct ceph_dentry_info *di;
831
832         BUG_ON(!inode);
833
834         di = ceph_dentry(dn);
835
836         spin_lock(&inode->i_lock);
837         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
838                 spin_unlock(&inode->i_lock);
839                 return;
840         }
841         di->offset = ceph_inode(inode)->i_max_offset++;
842         spin_unlock(&inode->i_lock);
843
844         spin_lock(&dcache_lock);
845         spin_lock(&dn->d_lock);
846         list_move(&dn->d_u.d_child, &dir->d_subdirs);
847         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
848              dn->d_u.d_child.prev, dn->d_u.d_child.next);
849         spin_unlock(&dn->d_lock);
850         spin_unlock(&dcache_lock);
851 }
852
853 /*
854  * splice a dentry to an inode.
855  * caller must hold directory i_mutex for this to be safe.
856  *
857  * we will only rehash the resulting dentry if @prehash is
858  * true; @prehash will be set to false (for the benefit of
859  * the caller) if we fail.
860  */
861 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
862                                     bool *prehash, bool set_offset)
863 {
864         struct dentry *realdn;
865
866         BUG_ON(dn->d_inode);
867
868         /* dn must be unhashed */
869         if (!d_unhashed(dn))
870                 d_drop(dn);
871         realdn = d_materialise_unique(dn, in);
872         if (IS_ERR(realdn)) {
873                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
874                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
875                 if (prehash)
876                         *prehash = false; /* don't rehash on error */
877                 dn = realdn; /* note realdn contains the error */
878                 goto out;
879         } else if (realdn) {
880                 dout("dn %p (%d) spliced with %p (%d) "
881                      "inode %p ino %llx.%llx\n",
882                      dn, atomic_read(&dn->d_count),
883                      realdn, atomic_read(&realdn->d_count),
884                      realdn->d_inode, ceph_vinop(realdn->d_inode));
885                 dput(dn);
886                 dn = realdn;
887         } else {
888                 BUG_ON(!ceph_dentry(dn));
889                 dout("dn %p attached to %p ino %llx.%llx\n",
890                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
891         }
892         if ((!prehash || *prehash) && d_unhashed(dn))
893                 d_rehash(dn);
894         if (set_offset)
895                 ceph_set_dentry_offset(dn);
896 out:
897         return dn;
898 }
899
900 /*
901  * Incorporate results into the local cache.  This is either just
902  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
903  * after a lookup).
904  *
905  * A reply may contain
906  *         a directory inode along with a dentry.
907  *  and/or a target inode
908  *
909  * Called with snap_rwsem (read).
910  */
911 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
912                     struct ceph_mds_session *session)
913 {
914         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
915         struct inode *in = NULL;
916         struct ceph_mds_reply_inode *ininfo;
917         struct ceph_vino vino;
918         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
919         int i = 0;
920         int err = 0;
921
922         dout("fill_trace %p is_dentry %d is_target %d\n", req,
923              rinfo->head->is_dentry, rinfo->head->is_target);
924
925 #if 0
926         /*
927          * Debugging hook:
928          *
929          * If we resend completed ops to a recovering mds, we get no
930          * trace.  Since that is very rare, pretend this is the case
931          * to ensure the 'no trace' handlers in the callers behave.
932          *
933          * Fill in inodes unconditionally to avoid breaking cap
934          * invariants.
935          */
936         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
937                 pr_info("fill_trace faking empty trace on %lld %s\n",
938                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
939                 if (rinfo->head->is_dentry) {
940                         rinfo->head->is_dentry = 0;
941                         err = fill_inode(req->r_locked_dir,
942                                          &rinfo->diri, rinfo->dirfrag,
943                                          session, req->r_request_started, -1);
944                 }
945                 if (rinfo->head->is_target) {
946                         rinfo->head->is_target = 0;
947                         ininfo = rinfo->targeti.in;
948                         vino.ino = le64_to_cpu(ininfo->ino);
949                         vino.snap = le64_to_cpu(ininfo->snapid);
950                         in = ceph_get_inode(sb, vino);
951                         err = fill_inode(in, &rinfo->targeti, NULL,
952                                          session, req->r_request_started,
953                                          req->r_fmode);
954                         iput(in);
955                 }
956         }
957 #endif
958
959         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
960                 dout("fill_trace reply is empty!\n");
961                 if (rinfo->head->result == 0 && req->r_locked_dir)
962                         ceph_invalidate_dir_request(req);
963                 return 0;
964         }
965
966         if (rinfo->head->is_dentry) {
967                 struct inode *dir = req->r_locked_dir;
968
969                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
970                                  session, req->r_request_started, -1,
971                                  &req->r_caps_reservation);
972                 if (err < 0)
973                         return err;
974         }
975
976         /*
977          * ignore null lease/binding on snapdir ENOENT, or else we
978          * will have trouble splicing in the virtual snapdir later
979          */
980         if (rinfo->head->is_dentry && !req->r_aborted &&
981             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
982                                                fsc->mount_options->snapdir_name,
983                                                req->r_dentry->d_name.len))) {
984                 /*
985                  * lookup link rename   : null -> possibly existing inode
986                  * mknod symlink mkdir  : null -> new inode
987                  * unlink               : linked -> null
988                  */
989                 struct inode *dir = req->r_locked_dir;
990                 struct dentry *dn = req->r_dentry;
991                 bool have_dir_cap, have_lease;
992
993                 BUG_ON(!dn);
994                 BUG_ON(!dir);
995                 BUG_ON(dn->d_parent->d_inode != dir);
996                 BUG_ON(ceph_ino(dir) !=
997                        le64_to_cpu(rinfo->diri.in->ino));
998                 BUG_ON(ceph_snap(dir) !=
999                        le64_to_cpu(rinfo->diri.in->snapid));
1000
1001                 /* do we have a lease on the whole dir? */
1002                 have_dir_cap =
1003                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1004                          CEPH_CAP_FILE_SHARED);
1005
1006                 /* do we have a dn lease? */
1007                 have_lease = have_dir_cap ||
1008                         (le16_to_cpu(rinfo->dlease->mask) &
1009                          CEPH_LOCK_DN);
1010
1011                 if (!have_lease)
1012                         dout("fill_trace  no dentry lease or dir cap\n");
1013
1014                 /* rename? */
1015                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1016                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1017                              req->r_old_dentry,
1018                              req->r_old_dentry->d_name.len,
1019                              req->r_old_dentry->d_name.name,
1020                              dn, dn->d_name.len, dn->d_name.name);
1021                         dout("fill_trace doing d_move %p -> %p\n",
1022                              req->r_old_dentry, dn);
1023
1024                         /* d_move screws up d_subdirs order */
1025                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1026
1027                         d_move(req->r_old_dentry, dn);
1028                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1029                              req->r_old_dentry,
1030                              req->r_old_dentry->d_name.len,
1031                              req->r_old_dentry->d_name.name,
1032                              dn, dn->d_name.len, dn->d_name.name);
1033
1034                         /* ensure target dentry is invalidated, despite
1035                            rehashing bug in vfs_rename_dir */
1036                         ceph_invalidate_dentry_lease(dn);
1037
1038                         /* take overwritten dentry's readdir offset */
1039                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1040                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1041                              ceph_dentry(req->r_old_dentry)->offset);
1042                         ceph_dentry(req->r_old_dentry)->offset =
1043                                 ceph_dentry(dn)->offset;
1044
1045                         dn = req->r_old_dentry;  /* use old_dentry */
1046                         in = dn->d_inode;
1047                 }
1048
1049                 /* null dentry? */
1050                 if (!rinfo->head->is_target) {
1051                         dout("fill_trace null dentry\n");
1052                         if (dn->d_inode) {
1053                                 dout("d_delete %p\n", dn);
1054                                 d_delete(dn);
1055                         } else {
1056                                 dout("d_instantiate %p NULL\n", dn);
1057                                 d_instantiate(dn, NULL);
1058                                 if (have_lease && d_unhashed(dn))
1059                                         d_rehash(dn);
1060                                 update_dentry_lease(dn, rinfo->dlease,
1061                                                     session,
1062                                                     req->r_request_started);
1063                         }
1064                         goto done;
1065                 }
1066
1067                 /* attach proper inode */
1068                 ininfo = rinfo->targeti.in;
1069                 vino.ino = le64_to_cpu(ininfo->ino);
1070                 vino.snap = le64_to_cpu(ininfo->snapid);
1071                 in = dn->d_inode;
1072                 if (!in) {
1073                         in = ceph_get_inode(sb, vino);
1074                         if (IS_ERR(in)) {
1075                                 pr_err("fill_trace bad get_inode "
1076                                        "%llx.%llx\n", vino.ino, vino.snap);
1077                                 err = PTR_ERR(in);
1078                                 d_delete(dn);
1079                                 goto done;
1080                         }
1081                         dn = splice_dentry(dn, in, &have_lease, true);
1082                         if (IS_ERR(dn)) {
1083                                 err = PTR_ERR(dn);
1084                                 goto done;
1085                         }
1086                         req->r_dentry = dn;  /* may have spliced */
1087                         igrab(in);
1088                 } else if (ceph_ino(in) == vino.ino &&
1089                            ceph_snap(in) == vino.snap) {
1090                         igrab(in);
1091                 } else {
1092                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1093                              dn, in, ceph_ino(in), ceph_snap(in),
1094                              vino.ino, vino.snap);
1095                         have_lease = false;
1096                         in = NULL;
1097                 }
1098
1099                 if (have_lease)
1100                         update_dentry_lease(dn, rinfo->dlease, session,
1101                                             req->r_request_started);
1102                 dout(" final dn %p\n", dn);
1103                 i++;
1104         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1105                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1106                 struct dentry *dn = req->r_dentry;
1107
1108                 /* fill out a snapdir LOOKUPSNAP dentry */
1109                 BUG_ON(!dn);
1110                 BUG_ON(!req->r_locked_dir);
1111                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1112                 ininfo = rinfo->targeti.in;
1113                 vino.ino = le64_to_cpu(ininfo->ino);
1114                 vino.snap = le64_to_cpu(ininfo->snapid);
1115                 in = ceph_get_inode(sb, vino);
1116                 if (IS_ERR(in)) {
1117                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1118                                vino.ino, vino.snap);
1119                         err = PTR_ERR(in);
1120                         d_delete(dn);
1121                         goto done;
1122                 }
1123                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1124                 dn = splice_dentry(dn, in, NULL, true);
1125                 if (IS_ERR(dn)) {
1126                         err = PTR_ERR(dn);
1127                         goto done;
1128                 }
1129                 req->r_dentry = dn;  /* may have spliced */
1130                 igrab(in);
1131                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1132         }
1133
1134         if (rinfo->head->is_target) {
1135                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1136                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1137
1138                 if (in == NULL || ceph_ino(in) != vino.ino ||
1139                     ceph_snap(in) != vino.snap) {
1140                         in = ceph_get_inode(sb, vino);
1141                         if (IS_ERR(in)) {
1142                                 err = PTR_ERR(in);
1143                                 goto done;
1144                         }
1145                 }
1146                 req->r_target_inode = in;
1147
1148                 err = fill_inode(in,
1149                                  &rinfo->targeti, NULL,
1150                                  session, req->r_request_started,
1151                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1152                                  req->r_fmode : -1,
1153                                  &req->r_caps_reservation);
1154                 if (err < 0) {
1155                         pr_err("fill_inode badness %p %llx.%llx\n",
1156                                in, ceph_vinop(in));
1157                         goto done;
1158                 }
1159         }
1160
1161 done:
1162         dout("fill_trace done err=%d\n", err);
1163         return err;
1164 }
1165
1166 /*
1167  * Prepopulate our cache with readdir results, leases, etc.
1168  */
1169 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1170                              struct ceph_mds_session *session)
1171 {
1172         struct dentry *parent = req->r_dentry;
1173         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1174         struct qstr dname;
1175         struct dentry *dn;
1176         struct inode *in;
1177         int err = 0, i;
1178         struct inode *snapdir = NULL;
1179         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1180         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1181         struct ceph_dentry_info *di;
1182
1183         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1184                 snapdir = ceph_get_snapdir(parent->d_inode);
1185                 parent = d_find_alias(snapdir);
1186                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1187                      rinfo->dir_nr, parent);
1188         } else {
1189                 dout("readdir_prepopulate %d items under dn %p\n",
1190                      rinfo->dir_nr, parent);
1191                 if (rinfo->dir_dir)
1192                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1193         }
1194
1195         for (i = 0; i < rinfo->dir_nr; i++) {
1196                 struct ceph_vino vino;
1197
1198                 dname.name = rinfo->dir_dname[i];
1199                 dname.len = rinfo->dir_dname_len[i];
1200                 dname.hash = full_name_hash(dname.name, dname.len);
1201
1202                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1203                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1204
1205 retry_lookup:
1206                 dn = d_lookup(parent, &dname);
1207                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1208                      parent, dname.len, dname.name, dn);
1209
1210                 if (!dn) {
1211                         dn = d_alloc(parent, &dname);
1212                         dout("d_alloc %p '%.*s' = %p\n", parent,
1213                              dname.len, dname.name, dn);
1214                         if (dn == NULL) {
1215                                 dout("d_alloc badness\n");
1216                                 err = -ENOMEM;
1217                                 goto out;
1218                         }
1219                         err = ceph_init_dentry(dn);
1220                         if (err < 0) {
1221                                 dput(dn);
1222                                 goto out;
1223                         }
1224                 } else if (dn->d_inode &&
1225                            (ceph_ino(dn->d_inode) != vino.ino ||
1226                             ceph_snap(dn->d_inode) != vino.snap)) {
1227                         dout(" dn %p points to wrong inode %p\n",
1228                              dn, dn->d_inode);
1229                         d_delete(dn);
1230                         dput(dn);
1231                         goto retry_lookup;
1232                 } else {
1233                         /* reorder parent's d_subdirs */
1234                         spin_lock(&dcache_lock);
1235                         spin_lock(&dn->d_lock);
1236                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1237                         spin_unlock(&dn->d_lock);
1238                         spin_unlock(&dcache_lock);
1239                 }
1240
1241                 di = dn->d_fsdata;
1242                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1243
1244                 /* inode */
1245                 if (dn->d_inode) {
1246                         in = dn->d_inode;
1247                 } else {
1248                         in = ceph_get_inode(parent->d_sb, vino);
1249                         if (IS_ERR(in)) {
1250                                 dout("new_inode badness\n");
1251                                 d_delete(dn);
1252                                 dput(dn);
1253                                 err = PTR_ERR(in);
1254                                 goto out;
1255                         }
1256                         dn = splice_dentry(dn, in, NULL, false);
1257                         if (IS_ERR(dn))
1258                                 dn = NULL;
1259                 }
1260
1261                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1262                                req->r_request_started, -1,
1263                                &req->r_caps_reservation) < 0) {
1264                         pr_err("fill_inode badness on %p\n", in);
1265                         goto next_item;
1266                 }
1267                 if (dn)
1268                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1269                                             req->r_session,
1270                                             req->r_request_started);
1271 next_item:
1272                 if (dn)
1273                         dput(dn);
1274         }
1275         req->r_did_prepopulate = true;
1276
1277 out:
1278         if (snapdir) {
1279                 iput(snapdir);
1280                 dput(parent);
1281         }
1282         dout("readdir_prepopulate done\n");
1283         return err;
1284 }
1285
1286 int ceph_inode_set_size(struct inode *inode, loff_t size)
1287 {
1288         struct ceph_inode_info *ci = ceph_inode(inode);
1289         int ret = 0;
1290
1291         spin_lock(&inode->i_lock);
1292         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1293         inode->i_size = size;
1294         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1295
1296         /* tell the MDS if we are approaching max_size */
1297         if ((size << 1) >= ci->i_max_size &&
1298             (ci->i_reported_size << 1) < ci->i_max_size)
1299                 ret = 1;
1300
1301         spin_unlock(&inode->i_lock);
1302         return ret;
1303 }
1304
1305 /*
1306  * Write back inode data in a worker thread.  (This can't be done
1307  * in the message handler context.)
1308  */
1309 void ceph_queue_writeback(struct inode *inode)
1310 {
1311         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1312                        &ceph_inode(inode)->i_wb_work)) {
1313                 dout("ceph_queue_writeback %p\n", inode);
1314                 igrab(inode);
1315         } else {
1316                 dout("ceph_queue_writeback %p failed\n", inode);
1317         }
1318 }
1319
1320 static void ceph_writeback_work(struct work_struct *work)
1321 {
1322         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1323                                                   i_wb_work);
1324         struct inode *inode = &ci->vfs_inode;
1325
1326         dout("writeback %p\n", inode);
1327         filemap_fdatawrite(&inode->i_data);
1328         iput(inode);
1329 }
1330
1331 /*
1332  * queue an async invalidation
1333  */
1334 void ceph_queue_invalidate(struct inode *inode)
1335 {
1336         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1337                        &ceph_inode(inode)->i_pg_inv_work)) {
1338                 dout("ceph_queue_invalidate %p\n", inode);
1339                 igrab(inode);
1340         } else {
1341                 dout("ceph_queue_invalidate %p failed\n", inode);
1342         }
1343 }
1344
1345 /*
1346  * invalidate any pages that are not dirty or under writeback.  this
1347  * includes pages that are clean and mapped.
1348  */
1349 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1350 {
1351         struct pagevec pvec;
1352         pgoff_t next = 0;
1353         int i;
1354
1355         pagevec_init(&pvec, 0);
1356         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1357                 for (i = 0; i < pagevec_count(&pvec); i++) {
1358                         struct page *page = pvec.pages[i];
1359                         pgoff_t index;
1360                         int skip_page =
1361                                 (PageDirty(page) || PageWriteback(page));
1362
1363                         if (!skip_page)
1364                                 skip_page = !trylock_page(page);
1365
1366                         /*
1367                          * We really shouldn't be looking at the ->index of an
1368                          * unlocked page.  But we're not allowed to lock these
1369                          * pages.  So we rely upon nobody altering the ->index
1370                          * of this (pinned-by-us) page.
1371                          */
1372                         index = page->index;
1373                         if (index > next)
1374                                 next = index;
1375                         next++;
1376
1377                         if (skip_page)
1378                                 continue;
1379
1380                         generic_error_remove_page(mapping, page);
1381                         unlock_page(page);
1382                 }
1383                 pagevec_release(&pvec);
1384                 cond_resched();
1385         }
1386 }
1387
1388 /*
1389  * Invalidate inode pages in a worker thread.  (This can't be done
1390  * in the message handler context.)
1391  */
1392 static void ceph_invalidate_work(struct work_struct *work)
1393 {
1394         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1395                                                   i_pg_inv_work);
1396         struct inode *inode = &ci->vfs_inode;
1397         u32 orig_gen;
1398         int check = 0;
1399
1400         spin_lock(&inode->i_lock);
1401         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1402              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1403         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1404                 /* nevermind! */
1405                 spin_unlock(&inode->i_lock);
1406                 goto out;
1407         }
1408         orig_gen = ci->i_rdcache_gen;
1409         spin_unlock(&inode->i_lock);
1410
1411         ceph_invalidate_nondirty_pages(inode->i_mapping);
1412
1413         spin_lock(&inode->i_lock);
1414         if (orig_gen == ci->i_rdcache_gen &&
1415             orig_gen == ci->i_rdcache_revoking) {
1416                 dout("invalidate_pages %p gen %d successful\n", inode,
1417                      ci->i_rdcache_gen);
1418                 ci->i_rdcache_revoking--;
1419                 check = 1;
1420         } else {
1421                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1422                      inode, orig_gen, ci->i_rdcache_gen,
1423                      ci->i_rdcache_revoking);
1424         }
1425         spin_unlock(&inode->i_lock);
1426
1427         if (check)
1428                 ceph_check_caps(ci, 0, NULL);
1429 out:
1430         iput(inode);
1431 }
1432
1433
1434 /*
1435  * called by trunc_wq; take i_mutex ourselves
1436  *
1437  * We also truncate in a separate thread as well.
1438  */
1439 static void ceph_vmtruncate_work(struct work_struct *work)
1440 {
1441         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1442                                                   i_vmtruncate_work);
1443         struct inode *inode = &ci->vfs_inode;
1444
1445         dout("vmtruncate_work %p\n", inode);
1446         mutex_lock(&inode->i_mutex);
1447         __ceph_do_pending_vmtruncate(inode);
1448         mutex_unlock(&inode->i_mutex);
1449         iput(inode);
1450 }
1451
1452 /*
1453  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1454  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1455  */
1456 void ceph_queue_vmtruncate(struct inode *inode)
1457 {
1458         struct ceph_inode_info *ci = ceph_inode(inode);
1459
1460         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1461                        &ci->i_vmtruncate_work)) {
1462                 dout("ceph_queue_vmtruncate %p\n", inode);
1463                 igrab(inode);
1464         } else {
1465                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1466                      inode, ci->i_truncate_pending);
1467         }
1468 }
1469
1470 /*
1471  * called with i_mutex held.
1472  *
1473  * Make sure any pending truncation is applied before doing anything
1474  * that may depend on it.
1475  */
1476 void __ceph_do_pending_vmtruncate(struct inode *inode)
1477 {
1478         struct ceph_inode_info *ci = ceph_inode(inode);
1479         u64 to;
1480         int wrbuffer_refs, wake = 0;
1481
1482 retry:
1483         spin_lock(&inode->i_lock);
1484         if (ci->i_truncate_pending == 0) {
1485                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1486                 spin_unlock(&inode->i_lock);
1487                 return;
1488         }
1489
1490         /*
1491          * make sure any dirty snapped pages are flushed before we
1492          * possibly truncate them.. so write AND block!
1493          */
1494         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1495                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1496                      inode);
1497                 spin_unlock(&inode->i_lock);
1498                 filemap_write_and_wait_range(&inode->i_data, 0,
1499                                              inode->i_sb->s_maxbytes);
1500                 goto retry;
1501         }
1502
1503         to = ci->i_truncate_size;
1504         wrbuffer_refs = ci->i_wrbuffer_ref;
1505         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1506              ci->i_truncate_pending, to);
1507         spin_unlock(&inode->i_lock);
1508
1509         truncate_inode_pages(inode->i_mapping, to);
1510
1511         spin_lock(&inode->i_lock);
1512         ci->i_truncate_pending--;
1513         if (ci->i_truncate_pending == 0)
1514                 wake = 1;
1515         spin_unlock(&inode->i_lock);
1516
1517         if (wrbuffer_refs == 0)
1518                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1519         if (wake)
1520                 wake_up_all(&ci->i_cap_wq);
1521 }
1522
1523
1524 /*
1525  * symlinks
1526  */
1527 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1528 {
1529         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1530         nd_set_link(nd, ci->i_symlink);
1531         return NULL;
1532 }
1533
1534 static const struct inode_operations ceph_symlink_iops = {
1535         .readlink = generic_readlink,
1536         .follow_link = ceph_sym_follow_link,
1537 };
1538
1539 /*
1540  * setattr
1541  */
1542 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1543 {
1544         struct inode *inode = dentry->d_inode;
1545         struct ceph_inode_info *ci = ceph_inode(inode);
1546         struct inode *parent_inode = dentry->d_parent->d_inode;
1547         const unsigned int ia_valid = attr->ia_valid;
1548         struct ceph_mds_request *req;
1549         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1550         int issued;
1551         int release = 0, dirtied = 0;
1552         int mask = 0;
1553         int err = 0;
1554
1555         if (ceph_snap(inode) != CEPH_NOSNAP)
1556                 return -EROFS;
1557
1558         __ceph_do_pending_vmtruncate(inode);
1559
1560         err = inode_change_ok(inode, attr);
1561         if (err != 0)
1562                 return err;
1563
1564         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1565                                        USE_AUTH_MDS);
1566         if (IS_ERR(req))
1567                 return PTR_ERR(req);
1568
1569         spin_lock(&inode->i_lock);
1570         issued = __ceph_caps_issued(ci, NULL);
1571         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1572
1573         if (ia_valid & ATTR_UID) {
1574                 dout("setattr %p uid %d -> %d\n", inode,
1575                      inode->i_uid, attr->ia_uid);
1576                 if (issued & CEPH_CAP_AUTH_EXCL) {
1577                         inode->i_uid = attr->ia_uid;
1578                         dirtied |= CEPH_CAP_AUTH_EXCL;
1579                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1580                            attr->ia_uid != inode->i_uid) {
1581                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1582                         mask |= CEPH_SETATTR_UID;
1583                         release |= CEPH_CAP_AUTH_SHARED;
1584                 }
1585         }
1586         if (ia_valid & ATTR_GID) {
1587                 dout("setattr %p gid %d -> %d\n", inode,
1588                      inode->i_gid, attr->ia_gid);
1589                 if (issued & CEPH_CAP_AUTH_EXCL) {
1590                         inode->i_gid = attr->ia_gid;
1591                         dirtied |= CEPH_CAP_AUTH_EXCL;
1592                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1593                            attr->ia_gid != inode->i_gid) {
1594                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1595                         mask |= CEPH_SETATTR_GID;
1596                         release |= CEPH_CAP_AUTH_SHARED;
1597                 }
1598         }
1599         if (ia_valid & ATTR_MODE) {
1600                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1601                      attr->ia_mode);
1602                 if (issued & CEPH_CAP_AUTH_EXCL) {
1603                         inode->i_mode = attr->ia_mode;
1604                         dirtied |= CEPH_CAP_AUTH_EXCL;
1605                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1606                            attr->ia_mode != inode->i_mode) {
1607                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1608                         mask |= CEPH_SETATTR_MODE;
1609                         release |= CEPH_CAP_AUTH_SHARED;
1610                 }
1611         }
1612
1613         if (ia_valid & ATTR_ATIME) {
1614                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1615                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1616                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1617                 if (issued & CEPH_CAP_FILE_EXCL) {
1618                         ci->i_time_warp_seq++;
1619                         inode->i_atime = attr->ia_atime;
1620                         dirtied |= CEPH_CAP_FILE_EXCL;
1621                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1622                            timespec_compare(&inode->i_atime,
1623                                             &attr->ia_atime) < 0) {
1624                         inode->i_atime = attr->ia_atime;
1625                         dirtied |= CEPH_CAP_FILE_WR;
1626                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1627                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1628                         ceph_encode_timespec(&req->r_args.setattr.atime,
1629                                              &attr->ia_atime);
1630                         mask |= CEPH_SETATTR_ATIME;
1631                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1632                                 CEPH_CAP_FILE_WR;
1633                 }
1634         }
1635         if (ia_valid & ATTR_MTIME) {
1636                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1637                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1638                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1639                 if (issued & CEPH_CAP_FILE_EXCL) {
1640                         ci->i_time_warp_seq++;
1641                         inode->i_mtime = attr->ia_mtime;
1642                         dirtied |= CEPH_CAP_FILE_EXCL;
1643                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1644                            timespec_compare(&inode->i_mtime,
1645                                             &attr->ia_mtime) < 0) {
1646                         inode->i_mtime = attr->ia_mtime;
1647                         dirtied |= CEPH_CAP_FILE_WR;
1648                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1649                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1650                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1651                                              &attr->ia_mtime);
1652                         mask |= CEPH_SETATTR_MTIME;
1653                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1654                                 CEPH_CAP_FILE_WR;
1655                 }
1656         }
1657         if (ia_valid & ATTR_SIZE) {
1658                 dout("setattr %p size %lld -> %lld\n", inode,
1659                      inode->i_size, attr->ia_size);
1660                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1661                         err = -EINVAL;
1662                         goto out;
1663                 }
1664                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1665                     attr->ia_size > inode->i_size) {
1666                         inode->i_size = attr->ia_size;
1667                         inode->i_blocks =
1668                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1669                         inode->i_ctime = attr->ia_ctime;
1670                         ci->i_reported_size = attr->ia_size;
1671                         dirtied |= CEPH_CAP_FILE_EXCL;
1672                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1673                            attr->ia_size != inode->i_size) {
1674                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1675                         req->r_args.setattr.old_size =
1676                                 cpu_to_le64(inode->i_size);
1677                         mask |= CEPH_SETATTR_SIZE;
1678                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1679                                 CEPH_CAP_FILE_WR;
1680                 }
1681         }
1682
1683         /* these do nothing */
1684         if (ia_valid & ATTR_CTIME) {
1685                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1686                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1687                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1688                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1689                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1690                      only ? "ctime only" : "ignored");
1691                 inode->i_ctime = attr->ia_ctime;
1692                 if (only) {
1693                         /*
1694                          * if kernel wants to dirty ctime but nothing else,
1695                          * we need to choose a cap to dirty under, or do
1696                          * a almost-no-op setattr
1697                          */
1698                         if (issued & CEPH_CAP_AUTH_EXCL)
1699                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1700                         else if (issued & CEPH_CAP_FILE_EXCL)
1701                                 dirtied |= CEPH_CAP_FILE_EXCL;
1702                         else if (issued & CEPH_CAP_XATTR_EXCL)
1703                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1704                         else
1705                                 mask |= CEPH_SETATTR_CTIME;
1706                 }
1707         }
1708         if (ia_valid & ATTR_FILE)
1709                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1710
1711         if (dirtied) {
1712                 __ceph_mark_dirty_caps(ci, dirtied);
1713                 inode->i_ctime = CURRENT_TIME;
1714         }
1715
1716         release &= issued;
1717         spin_unlock(&inode->i_lock);
1718
1719         if (mask) {
1720                 req->r_inode = igrab(inode);
1721                 req->r_inode_drop = release;
1722                 req->r_args.setattr.mask = cpu_to_le32(mask);
1723                 req->r_num_caps = 1;
1724                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1725         }
1726         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1727              ceph_cap_string(dirtied), mask);
1728
1729         ceph_mdsc_put_request(req);
1730         __ceph_do_pending_vmtruncate(inode);
1731         return err;
1732 out:
1733         spin_unlock(&inode->i_lock);
1734         ceph_mdsc_put_request(req);
1735         return err;
1736 }
1737
1738 /*
1739  * Verify that we have a lease on the given mask.  If not,
1740  * do a getattr against an mds.
1741  */
1742 int ceph_do_getattr(struct inode *inode, int mask)
1743 {
1744         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1745         struct ceph_mds_client *mdsc = fsc->mdsc;
1746         struct ceph_mds_request *req;
1747         int err;
1748
1749         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1750                 dout("do_getattr inode %p SNAPDIR\n", inode);
1751                 return 0;
1752         }
1753
1754         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1755         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1756                 return 0;
1757
1758         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1759         if (IS_ERR(req))
1760                 return PTR_ERR(req);
1761         req->r_inode = igrab(inode);
1762         req->r_num_caps = 1;
1763         req->r_args.getattr.mask = cpu_to_le32(mask);
1764         err = ceph_mdsc_do_request(mdsc, NULL, req);
1765         ceph_mdsc_put_request(req);
1766         dout("do_getattr result=%d\n", err);
1767         return err;
1768 }
1769
1770
1771 /*
1772  * Check inode permissions.  We verify we have a valid value for
1773  * the AUTH cap, then call the generic handler.
1774  */
1775 int ceph_permission(struct inode *inode, int mask)
1776 {
1777         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1778
1779         if (!err)
1780                 err = generic_permission(inode, mask, NULL);
1781         return err;
1782 }
1783
1784 /*
1785  * Get all attributes.  Hopefully somedata we'll have a statlite()
1786  * and can limit the fields we require to be accurate.
1787  */
1788 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1789                  struct kstat *stat)
1790 {
1791         struct inode *inode = dentry->d_inode;
1792         struct ceph_inode_info *ci = ceph_inode(inode);
1793         int err;
1794
1795         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1796         if (!err) {
1797                 generic_fillattr(inode, stat);
1798                 stat->ino = inode->i_ino;
1799                 if (ceph_snap(inode) != CEPH_NOSNAP)
1800                         stat->dev = ceph_snap(inode);
1801                 else
1802                         stat->dev = 0;
1803                 if (S_ISDIR(inode->i_mode)) {
1804                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1805                                                 RBYTES))
1806                                 stat->size = ci->i_rbytes;
1807                         else
1808                                 stat->size = ci->i_files + ci->i_subdirs;
1809                         stat->blocks = 0;
1810                         stat->blksize = 65536;
1811                 }
1812         }
1813         return err;
1814 }