ceph: use i_ceph_lock instead of i_lock
[linux-2.6.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
13 #include "super.h"
14 #include "mds_client.h"
15 #include <linux/ceph/decode.h>
16
17 /*
18  * Ceph inode operations
19  *
20  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
21  * setattr, etc.), xattr helpers, and helpers for assimilating
22  * metadata returned by the MDS into our cache.
23  *
24  * Also define helpers for doing asynchronous writeback, invalidation,
25  * and truncation for the benefit of those who can't afford to block
26  * (typically because they are in the message handler path).
27  */
28
29 static const struct inode_operations ceph_symlink_iops;
30
31 static void ceph_invalidate_work(struct work_struct *work);
32 static void ceph_writeback_work(struct work_struct *work);
33 static void ceph_vmtruncate_work(struct work_struct *work);
34
35 /*
36  * find or create an inode, given the ceph ino number
37  */
38 static int ceph_set_ino_cb(struct inode *inode, void *data)
39 {
40         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
41         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
42         return 0;
43 }
44
45 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
46 {
47         struct inode *inode;
48         ino_t t = ceph_vino_to_ino(vino);
49
50         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
51         if (inode == NULL)
52                 return ERR_PTR(-ENOMEM);
53         if (inode->i_state & I_NEW) {
54                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
55                      inode, ceph_vinop(inode), (u64)inode->i_ino);
56                 unlock_new_inode(inode);
57         }
58
59         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
60              vino.snap, inode);
61         return inode;
62 }
63
64 /*
65  * get/constuct snapdir inode for a given directory
66  */
67 struct inode *ceph_get_snapdir(struct inode *parent)
68 {
69         struct ceph_vino vino = {
70                 .ino = ceph_ino(parent),
71                 .snap = CEPH_SNAPDIR,
72         };
73         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
74         struct ceph_inode_info *ci = ceph_inode(inode);
75
76         BUG_ON(!S_ISDIR(parent->i_mode));
77         if (IS_ERR(inode))
78                 return inode;
79         inode->i_mode = parent->i_mode;
80         inode->i_uid = parent->i_uid;
81         inode->i_gid = parent->i_gid;
82         inode->i_op = &ceph_dir_iops;
83         inode->i_fop = &ceph_dir_fops;
84         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
85         ci->i_rbytes = 0;
86         return inode;
87 }
88
89 const struct inode_operations ceph_file_iops = {
90         .permission = ceph_permission,
91         .setattr = ceph_setattr,
92         .getattr = ceph_getattr,
93         .setxattr = ceph_setxattr,
94         .getxattr = ceph_getxattr,
95         .listxattr = ceph_listxattr,
96         .removexattr = ceph_removexattr,
97 };
98
99
100 /*
101  * We use a 'frag tree' to keep track of the MDS's directory fragments
102  * for a given inode (usually there is just a single fragment).  We
103  * need to know when a child frag is delegated to a new MDS, or when
104  * it is flagged as replicated, so we can direct our requests
105  * accordingly.
106  */
107
108 /*
109  * find/create a frag in the tree
110  */
111 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
112                                                     u32 f)
113 {
114         struct rb_node **p;
115         struct rb_node *parent = NULL;
116         struct ceph_inode_frag *frag;
117         int c;
118
119         p = &ci->i_fragtree.rb_node;
120         while (*p) {
121                 parent = *p;
122                 frag = rb_entry(parent, struct ceph_inode_frag, node);
123                 c = ceph_frag_compare(f, frag->frag);
124                 if (c < 0)
125                         p = &(*p)->rb_left;
126                 else if (c > 0)
127                         p = &(*p)->rb_right;
128                 else
129                         return frag;
130         }
131
132         frag = kmalloc(sizeof(*frag), GFP_NOFS);
133         if (!frag) {
134                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
135                        "frag %x\n", &ci->vfs_inode,
136                        ceph_vinop(&ci->vfs_inode), f);
137                 return ERR_PTR(-ENOMEM);
138         }
139         frag->frag = f;
140         frag->split_by = 0;
141         frag->mds = -1;
142         frag->ndist = 0;
143
144         rb_link_node(&frag->node, parent, p);
145         rb_insert_color(&frag->node, &ci->i_fragtree);
146
147         dout("get_or_create_frag added %llx.%llx frag %x\n",
148              ceph_vinop(&ci->vfs_inode), f);
149         return frag;
150 }
151
152 /*
153  * find a specific frag @f
154  */
155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
156 {
157         struct rb_node *n = ci->i_fragtree.rb_node;
158
159         while (n) {
160                 struct ceph_inode_frag *frag =
161                         rb_entry(n, struct ceph_inode_frag, node);
162                 int c = ceph_frag_compare(f, frag->frag);
163                 if (c < 0)
164                         n = n->rb_left;
165                 else if (c > 0)
166                         n = n->rb_right;
167                 else
168                         return frag;
169         }
170         return NULL;
171 }
172
173 /*
174  * Choose frag containing the given value @v.  If @pfrag is
175  * specified, copy the frag delegation info to the caller if
176  * it is present.
177  */
178 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
179                      struct ceph_inode_frag *pfrag,
180                      int *found)
181 {
182         u32 t = ceph_frag_make(0, 0);
183         struct ceph_inode_frag *frag;
184         unsigned nway, i;
185         u32 n;
186
187         if (found)
188                 *found = 0;
189
190         mutex_lock(&ci->i_fragtree_mutex);
191         while (1) {
192                 WARN_ON(!ceph_frag_contains_value(t, v));
193                 frag = __ceph_find_frag(ci, t);
194                 if (!frag)
195                         break; /* t is a leaf */
196                 if (frag->split_by == 0) {
197                         if (pfrag)
198                                 memcpy(pfrag, frag, sizeof(*pfrag));
199                         if (found)
200                                 *found = 1;
201                         break;
202                 }
203
204                 /* choose child */
205                 nway = 1 << frag->split_by;
206                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
207                      frag->split_by, nway);
208                 for (i = 0; i < nway; i++) {
209                         n = ceph_frag_make_child(t, frag->split_by, i);
210                         if (ceph_frag_contains_value(n, v)) {
211                                 t = n;
212                                 break;
213                         }
214                 }
215                 BUG_ON(i == nway);
216         }
217         dout("choose_frag(%x) = %x\n", v, t);
218
219         mutex_unlock(&ci->i_fragtree_mutex);
220         return t;
221 }
222
223 /*
224  * Process dirfrag (delegation) info from the mds.  Include leaf
225  * fragment in tree ONLY if ndist > 0.  Otherwise, only
226  * branches/splits are included in i_fragtree)
227  */
228 static int ceph_fill_dirfrag(struct inode *inode,
229                              struct ceph_mds_reply_dirfrag *dirinfo)
230 {
231         struct ceph_inode_info *ci = ceph_inode(inode);
232         struct ceph_inode_frag *frag;
233         u32 id = le32_to_cpu(dirinfo->frag);
234         int mds = le32_to_cpu(dirinfo->auth);
235         int ndist = le32_to_cpu(dirinfo->ndist);
236         int i;
237         int err = 0;
238
239         mutex_lock(&ci->i_fragtree_mutex);
240         if (ndist == 0) {
241                 /* no delegation info needed. */
242                 frag = __ceph_find_frag(ci, id);
243                 if (!frag)
244                         goto out;
245                 if (frag->split_by == 0) {
246                         /* tree leaf, remove */
247                         dout("fill_dirfrag removed %llx.%llx frag %x"
248                              " (no ref)\n", ceph_vinop(inode), id);
249                         rb_erase(&frag->node, &ci->i_fragtree);
250                         kfree(frag);
251                 } else {
252                         /* tree branch, keep and clear */
253                         dout("fill_dirfrag cleared %llx.%llx frag %x"
254                              " referral\n", ceph_vinop(inode), id);
255                         frag->mds = -1;
256                         frag->ndist = 0;
257                 }
258                 goto out;
259         }
260
261
262         /* find/add this frag to store mds delegation info */
263         frag = __get_or_create_frag(ci, id);
264         if (IS_ERR(frag)) {
265                 /* this is not the end of the world; we can continue
266                    with bad/inaccurate delegation info */
267                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
268                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
269                 err = -ENOMEM;
270                 goto out;
271         }
272
273         frag->mds = mds;
274         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
275         for (i = 0; i < frag->ndist; i++)
276                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
277         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
278              ceph_vinop(inode), frag->frag, frag->ndist);
279
280 out:
281         mutex_unlock(&ci->i_fragtree_mutex);
282         return err;
283 }
284
285
286 /*
287  * initialize a newly allocated inode.
288  */
289 struct inode *ceph_alloc_inode(struct super_block *sb)
290 {
291         struct ceph_inode_info *ci;
292         int i;
293
294         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
295         if (!ci)
296                 return NULL;
297
298         dout("alloc_inode %p\n", &ci->vfs_inode);
299
300         spin_lock_init(&ci->i_ceph_lock);
301
302         ci->i_version = 0;
303         ci->i_time_warp_seq = 0;
304         ci->i_ceph_flags = 0;
305         ci->i_release_count = 0;
306         ci->i_symlink = NULL;
307
308         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
309
310         ci->i_fragtree = RB_ROOT;
311         mutex_init(&ci->i_fragtree_mutex);
312
313         ci->i_xattrs.blob = NULL;
314         ci->i_xattrs.prealloc_blob = NULL;
315         ci->i_xattrs.dirty = false;
316         ci->i_xattrs.index = RB_ROOT;
317         ci->i_xattrs.count = 0;
318         ci->i_xattrs.names_size = 0;
319         ci->i_xattrs.vals_size = 0;
320         ci->i_xattrs.version = 0;
321         ci->i_xattrs.index_version = 0;
322
323         ci->i_caps = RB_ROOT;
324         ci->i_auth_cap = NULL;
325         ci->i_dirty_caps = 0;
326         ci->i_flushing_caps = 0;
327         INIT_LIST_HEAD(&ci->i_dirty_item);
328         INIT_LIST_HEAD(&ci->i_flushing_item);
329         ci->i_cap_flush_seq = 0;
330         ci->i_cap_flush_last_tid = 0;
331         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
332         init_waitqueue_head(&ci->i_cap_wq);
333         ci->i_hold_caps_min = 0;
334         ci->i_hold_caps_max = 0;
335         INIT_LIST_HEAD(&ci->i_cap_delay_list);
336         ci->i_cap_exporting_mds = 0;
337         ci->i_cap_exporting_mseq = 0;
338         ci->i_cap_exporting_issued = 0;
339         INIT_LIST_HEAD(&ci->i_cap_snaps);
340         ci->i_head_snapc = NULL;
341         ci->i_snap_caps = 0;
342
343         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
344                 ci->i_nr_by_mode[i] = 0;
345
346         ci->i_truncate_seq = 0;
347         ci->i_truncate_size = 0;
348         ci->i_truncate_pending = 0;
349
350         ci->i_max_size = 0;
351         ci->i_reported_size = 0;
352         ci->i_wanted_max_size = 0;
353         ci->i_requested_max_size = 0;
354
355         ci->i_pin_ref = 0;
356         ci->i_rd_ref = 0;
357         ci->i_rdcache_ref = 0;
358         ci->i_wr_ref = 0;
359         ci->i_wb_ref = 0;
360         ci->i_wrbuffer_ref = 0;
361         ci->i_wrbuffer_ref_head = 0;
362         ci->i_shared_gen = 0;
363         ci->i_rdcache_gen = 0;
364         ci->i_rdcache_revoking = 0;
365
366         INIT_LIST_HEAD(&ci->i_unsafe_writes);
367         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
368         spin_lock_init(&ci->i_unsafe_lock);
369
370         ci->i_snap_realm = NULL;
371         INIT_LIST_HEAD(&ci->i_snap_realm_item);
372         INIT_LIST_HEAD(&ci->i_snap_flush_item);
373
374         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
375         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
376
377         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
378
379         return &ci->vfs_inode;
380 }
381
382 static void ceph_i_callback(struct rcu_head *head)
383 {
384         struct inode *inode = container_of(head, struct inode, i_rcu);
385         struct ceph_inode_info *ci = ceph_inode(inode);
386
387         INIT_LIST_HEAD(&inode->i_dentry);
388         kmem_cache_free(ceph_inode_cachep, ci);
389 }
390
391 void ceph_destroy_inode(struct inode *inode)
392 {
393         struct ceph_inode_info *ci = ceph_inode(inode);
394         struct ceph_inode_frag *frag;
395         struct rb_node *n;
396
397         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
398
399         ceph_queue_caps_release(inode);
400
401         /*
402          * we may still have a snap_realm reference if there are stray
403          * caps in i_cap_exporting_issued or i_snap_caps.
404          */
405         if (ci->i_snap_realm) {
406                 struct ceph_mds_client *mdsc =
407                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
408                 struct ceph_snap_realm *realm = ci->i_snap_realm;
409
410                 dout(" dropping residual ref to snap realm %p\n", realm);
411                 spin_lock(&realm->inodes_with_caps_lock);
412                 list_del_init(&ci->i_snap_realm_item);
413                 spin_unlock(&realm->inodes_with_caps_lock);
414                 ceph_put_snap_realm(mdsc, realm);
415         }
416
417         kfree(ci->i_symlink);
418         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
419                 frag = rb_entry(n, struct ceph_inode_frag, node);
420                 rb_erase(n, &ci->i_fragtree);
421                 kfree(frag);
422         }
423
424         __ceph_destroy_xattrs(ci);
425         if (ci->i_xattrs.blob)
426                 ceph_buffer_put(ci->i_xattrs.blob);
427         if (ci->i_xattrs.prealloc_blob)
428                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
429
430         call_rcu(&inode->i_rcu, ceph_i_callback);
431 }
432
433
434 /*
435  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
436  * careful because either the client or MDS may have more up to date
437  * info, depending on which capabilities are held, and whether
438  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
439  * and size are monotonically increasing, except when utimes() or
440  * truncate() increments the corresponding _seq values.)
441  */
442 int ceph_fill_file_size(struct inode *inode, int issued,
443                         u32 truncate_seq, u64 truncate_size, u64 size)
444 {
445         struct ceph_inode_info *ci = ceph_inode(inode);
446         int queue_trunc = 0;
447
448         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
449             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
450                 dout("size %lld -> %llu\n", inode->i_size, size);
451                 inode->i_size = size;
452                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
453                 ci->i_reported_size = size;
454                 if (truncate_seq != ci->i_truncate_seq) {
455                         dout("truncate_seq %u -> %u\n",
456                              ci->i_truncate_seq, truncate_seq);
457                         ci->i_truncate_seq = truncate_seq;
458                         /*
459                          * If we hold relevant caps, or in the case where we're
460                          * not the only client referencing this file and we
461                          * don't hold those caps, then we need to check whether
462                          * the file is either opened or mmaped
463                          */
464                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
465                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
466                                        CEPH_CAP_FILE_EXCL|
467                                        CEPH_CAP_FILE_LAZYIO)) ||
468                             mapping_mapped(inode->i_mapping) ||
469                             __ceph_caps_file_wanted(ci)) {
470                                 ci->i_truncate_pending++;
471                                 queue_trunc = 1;
472                         }
473                 }
474         }
475         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
476             ci->i_truncate_size != truncate_size) {
477                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
478                      truncate_size);
479                 ci->i_truncate_size = truncate_size;
480         }
481         return queue_trunc;
482 }
483
484 void ceph_fill_file_time(struct inode *inode, int issued,
485                          u64 time_warp_seq, struct timespec *ctime,
486                          struct timespec *mtime, struct timespec *atime)
487 {
488         struct ceph_inode_info *ci = ceph_inode(inode);
489         int warn = 0;
490
491         if (issued & (CEPH_CAP_FILE_EXCL|
492                       CEPH_CAP_FILE_WR|
493                       CEPH_CAP_FILE_BUFFER|
494                       CEPH_CAP_AUTH_EXCL|
495                       CEPH_CAP_XATTR_EXCL)) {
496                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
497                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
498                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
499                              ctime->tv_sec, ctime->tv_nsec);
500                         inode->i_ctime = *ctime;
501                 }
502                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
503                         /* the MDS did a utimes() */
504                         dout("mtime %ld.%09ld -> %ld.%09ld "
505                              "tw %d -> %d\n",
506                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
507                              mtime->tv_sec, mtime->tv_nsec,
508                              ci->i_time_warp_seq, (int)time_warp_seq);
509
510                         inode->i_mtime = *mtime;
511                         inode->i_atime = *atime;
512                         ci->i_time_warp_seq = time_warp_seq;
513                 } else if (time_warp_seq == ci->i_time_warp_seq) {
514                         /* nobody did utimes(); take the max */
515                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
516                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
517                                      inode->i_mtime.tv_sec,
518                                      inode->i_mtime.tv_nsec,
519                                      mtime->tv_sec, mtime->tv_nsec);
520                                 inode->i_mtime = *mtime;
521                         }
522                         if (timespec_compare(atime, &inode->i_atime) > 0) {
523                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
524                                      inode->i_atime.tv_sec,
525                                      inode->i_atime.tv_nsec,
526                                      atime->tv_sec, atime->tv_nsec);
527                                 inode->i_atime = *atime;
528                         }
529                 } else if (issued & CEPH_CAP_FILE_EXCL) {
530                         /* we did a utimes(); ignore mds values */
531                 } else {
532                         warn = 1;
533                 }
534         } else {
535                 /* we have no write|excl caps; whatever the MDS says is true */
536                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
537                         inode->i_ctime = *ctime;
538                         inode->i_mtime = *mtime;
539                         inode->i_atime = *atime;
540                         ci->i_time_warp_seq = time_warp_seq;
541                 } else {
542                         warn = 1;
543                 }
544         }
545         if (warn) /* time_warp_seq shouldn't go backwards */
546                 dout("%p mds time_warp_seq %llu < %u\n",
547                      inode, time_warp_seq, ci->i_time_warp_seq);
548 }
549
550 /*
551  * Populate an inode based on info from mds.  May be called on new or
552  * existing inodes.
553  */
554 static int fill_inode(struct inode *inode,
555                       struct ceph_mds_reply_info_in *iinfo,
556                       struct ceph_mds_reply_dirfrag *dirinfo,
557                       struct ceph_mds_session *session,
558                       unsigned long ttl_from, int cap_fmode,
559                       struct ceph_cap_reservation *caps_reservation)
560 {
561         struct ceph_mds_reply_inode *info = iinfo->in;
562         struct ceph_inode_info *ci = ceph_inode(inode);
563         int i;
564         int issued = 0, implemented;
565         int updating_inode = 0;
566         struct timespec mtime, atime, ctime;
567         u32 nsplits;
568         struct ceph_buffer *xattr_blob = NULL;
569         int err = 0;
570         int queue_trunc = 0;
571
572         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
573              inode, ceph_vinop(inode), le64_to_cpu(info->version),
574              ci->i_version);
575
576         /*
577          * prealloc xattr data, if it looks like we'll need it.  only
578          * if len > 4 (meaning there are actually xattrs; the first 4
579          * bytes are the xattr count).
580          */
581         if (iinfo->xattr_len > 4) {
582                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
583                 if (!xattr_blob)
584                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
585                                iinfo->xattr_len);
586         }
587
588         spin_lock(&ci->i_ceph_lock);
589
590         /*
591          * provided version will be odd if inode value is projected,
592          * even if stable.  skip the update if we have newer stable
593          * info (ours>=theirs, e.g. due to racing mds replies), unless
594          * we are getting projected (unstable) info (in which case the
595          * version is odd, and we want ours>theirs).
596          *   us   them
597          *   2    2     skip
598          *   3    2     skip
599          *   3    3     update
600          */
601         if (le64_to_cpu(info->version) > 0 &&
602             (ci->i_version & ~1) >= le64_to_cpu(info->version))
603                 goto no_change;
604         
605         updating_inode = 1;
606         issued = __ceph_caps_issued(ci, &implemented);
607         issued |= implemented | __ceph_caps_dirty(ci);
608
609         /* update inode */
610         ci->i_version = le64_to_cpu(info->version);
611         inode->i_version++;
612         inode->i_rdev = le32_to_cpu(info->rdev);
613
614         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
615                 inode->i_mode = le32_to_cpu(info->mode);
616                 inode->i_uid = le32_to_cpu(info->uid);
617                 inode->i_gid = le32_to_cpu(info->gid);
618                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
619                      inode->i_uid, inode->i_gid);
620         }
621
622         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
623                 set_nlink(inode, le32_to_cpu(info->nlink));
624
625         /* be careful with mtime, atime, size */
626         ceph_decode_timespec(&atime, &info->atime);
627         ceph_decode_timespec(&mtime, &info->mtime);
628         ceph_decode_timespec(&ctime, &info->ctime);
629         queue_trunc = ceph_fill_file_size(inode, issued,
630                                           le32_to_cpu(info->truncate_seq),
631                                           le64_to_cpu(info->truncate_size),
632                                           le64_to_cpu(info->size));
633         ceph_fill_file_time(inode, issued,
634                             le32_to_cpu(info->time_warp_seq),
635                             &ctime, &mtime, &atime);
636
637         /* only update max_size on auth cap */
638         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
639             ci->i_max_size != le64_to_cpu(info->max_size)) {
640                 dout("max_size %lld -> %llu\n", ci->i_max_size,
641                      le64_to_cpu(info->max_size));
642                 ci->i_max_size = le64_to_cpu(info->max_size);
643         }
644
645         ci->i_layout = info->layout;
646         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
647
648         /* xattrs */
649         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
650         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
651             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
652                 if (ci->i_xattrs.blob)
653                         ceph_buffer_put(ci->i_xattrs.blob);
654                 ci->i_xattrs.blob = xattr_blob;
655                 if (xattr_blob)
656                         memcpy(ci->i_xattrs.blob->vec.iov_base,
657                                iinfo->xattr_data, iinfo->xattr_len);
658                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
659                 xattr_blob = NULL;
660         }
661
662         inode->i_mapping->a_ops = &ceph_aops;
663         inode->i_mapping->backing_dev_info =
664                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
665
666         switch (inode->i_mode & S_IFMT) {
667         case S_IFIFO:
668         case S_IFBLK:
669         case S_IFCHR:
670         case S_IFSOCK:
671                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
672                 inode->i_op = &ceph_file_iops;
673                 break;
674         case S_IFREG:
675                 inode->i_op = &ceph_file_iops;
676                 inode->i_fop = &ceph_file_fops;
677                 break;
678         case S_IFLNK:
679                 inode->i_op = &ceph_symlink_iops;
680                 if (!ci->i_symlink) {
681                         int symlen = iinfo->symlink_len;
682                         char *sym;
683
684                         BUG_ON(symlen != inode->i_size);
685                         spin_unlock(&ci->i_ceph_lock);
686
687                         err = -ENOMEM;
688                         sym = kmalloc(symlen+1, GFP_NOFS);
689                         if (!sym)
690                                 goto out;
691                         memcpy(sym, iinfo->symlink, symlen);
692                         sym[symlen] = 0;
693
694                         spin_lock(&ci->i_ceph_lock);
695                         if (!ci->i_symlink)
696                                 ci->i_symlink = sym;
697                         else
698                                 kfree(sym); /* lost a race */
699                 }
700                 break;
701         case S_IFDIR:
702                 inode->i_op = &ceph_dir_iops;
703                 inode->i_fop = &ceph_dir_fops;
704
705                 ci->i_dir_layout = iinfo->dir_layout;
706
707                 ci->i_files = le64_to_cpu(info->files);
708                 ci->i_subdirs = le64_to_cpu(info->subdirs);
709                 ci->i_rbytes = le64_to_cpu(info->rbytes);
710                 ci->i_rfiles = le64_to_cpu(info->rfiles);
711                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
712                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
713                 break;
714         default:
715                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
716                        ceph_vinop(inode), inode->i_mode);
717         }
718
719 no_change:
720         spin_unlock(&ci->i_ceph_lock);
721
722         /* queue truncate if we saw i_size decrease */
723         if (queue_trunc)
724                 ceph_queue_vmtruncate(inode);
725
726         /* populate frag tree */
727         /* FIXME: move me up, if/when version reflects fragtree changes */
728         nsplits = le32_to_cpu(info->fragtree.nsplits);
729         mutex_lock(&ci->i_fragtree_mutex);
730         for (i = 0; i < nsplits; i++) {
731                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
732                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
733
734                 if (IS_ERR(frag))
735                         continue;
736                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
737                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
738         }
739         mutex_unlock(&ci->i_fragtree_mutex);
740
741         /* were we issued a capability? */
742         if (info->cap.caps) {
743                 if (ceph_snap(inode) == CEPH_NOSNAP) {
744                         ceph_add_cap(inode, session,
745                                      le64_to_cpu(info->cap.cap_id),
746                                      cap_fmode,
747                                      le32_to_cpu(info->cap.caps),
748                                      le32_to_cpu(info->cap.wanted),
749                                      le32_to_cpu(info->cap.seq),
750                                      le32_to_cpu(info->cap.mseq),
751                                      le64_to_cpu(info->cap.realm),
752                                      info->cap.flags,
753                                      caps_reservation);
754                 } else {
755                         spin_lock(&ci->i_ceph_lock);
756                         dout(" %p got snap_caps %s\n", inode,
757                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
758                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
759                         if (cap_fmode >= 0)
760                                 __ceph_get_fmode(ci, cap_fmode);
761                         spin_unlock(&ci->i_ceph_lock);
762                 }
763         } else if (cap_fmode >= 0) {
764                 pr_warning("mds issued no caps on %llx.%llx\n",
765                            ceph_vinop(inode));
766                 __ceph_get_fmode(ci, cap_fmode);
767         }
768
769         /* set dir completion flag? */
770         if (S_ISDIR(inode->i_mode) &&
771             updating_inode &&                 /* didn't jump to no_change */
772             ci->i_files == 0 && ci->i_subdirs == 0 &&
773             ceph_snap(inode) == CEPH_NOSNAP &&
774             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
775             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
776             !ceph_dir_test_complete(inode)) {
777                 dout(" marking %p complete (empty)\n", inode);
778                 ceph_dir_set_complete(inode);
779                 ci->i_max_offset = 2;
780         }
781
782         /* update delegation info? */
783         if (dirinfo)
784                 ceph_fill_dirfrag(inode, dirinfo);
785
786         err = 0;
787
788 out:
789         if (xattr_blob)
790                 ceph_buffer_put(xattr_blob);
791         return err;
792 }
793
794 /*
795  * caller should hold session s_mutex.
796  */
797 static void update_dentry_lease(struct dentry *dentry,
798                                 struct ceph_mds_reply_lease *lease,
799                                 struct ceph_mds_session *session,
800                                 unsigned long from_time)
801 {
802         struct ceph_dentry_info *di = ceph_dentry(dentry);
803         long unsigned duration = le32_to_cpu(lease->duration_ms);
804         long unsigned ttl = from_time + (duration * HZ) / 1000;
805         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
806         struct inode *dir;
807
808         /* only track leases on regular dentries */
809         if (dentry->d_op != &ceph_dentry_ops)
810                 return;
811
812         spin_lock(&dentry->d_lock);
813         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
814              dentry, duration, ttl);
815
816         /* make lease_rdcache_gen match directory */
817         dir = dentry->d_parent->d_inode;
818         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
819
820         if (duration == 0)
821                 goto out_unlock;
822
823         if (di->lease_gen == session->s_cap_gen &&
824             time_before(ttl, dentry->d_time))
825                 goto out_unlock;  /* we already have a newer lease. */
826
827         if (di->lease_session && di->lease_session != session)
828                 goto out_unlock;
829
830         ceph_dentry_lru_touch(dentry);
831
832         if (!di->lease_session)
833                 di->lease_session = ceph_get_mds_session(session);
834         di->lease_gen = session->s_cap_gen;
835         di->lease_seq = le32_to_cpu(lease->seq);
836         di->lease_renew_after = half_ttl;
837         di->lease_renew_from = 0;
838         dentry->d_time = ttl;
839 out_unlock:
840         spin_unlock(&dentry->d_lock);
841         return;
842 }
843
844 /*
845  * Set dentry's directory position based on the current dir's max, and
846  * order it in d_subdirs, so that dcache_readdir behaves.
847  *
848  * Always called under directory's i_mutex.
849  */
850 static void ceph_set_dentry_offset(struct dentry *dn)
851 {
852         struct dentry *dir = dn->d_parent;
853         struct inode *inode = dir->d_inode;
854         struct ceph_inode_info *ci = ceph_inode(inode);
855         struct ceph_dentry_info *di;
856
857         BUG_ON(!inode);
858
859         di = ceph_dentry(dn);
860
861         spin_lock(&ci->i_ceph_lock);
862         if (!ceph_dir_test_complete(inode)) {
863                 spin_unlock(&ci->i_ceph_lock);
864                 return;
865         }
866         di->offset = ceph_inode(inode)->i_max_offset++;
867         spin_unlock(&ci->i_ceph_lock);
868
869         spin_lock(&dir->d_lock);
870         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
871         list_move(&dn->d_u.d_child, &dir->d_subdirs);
872         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
873              dn->d_u.d_child.prev, dn->d_u.d_child.next);
874         spin_unlock(&dn->d_lock);
875         spin_unlock(&dir->d_lock);
876 }
877
878 /*
879  * splice a dentry to an inode.
880  * caller must hold directory i_mutex for this to be safe.
881  *
882  * we will only rehash the resulting dentry if @prehash is
883  * true; @prehash will be set to false (for the benefit of
884  * the caller) if we fail.
885  */
886 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
887                                     bool *prehash, bool set_offset)
888 {
889         struct dentry *realdn;
890
891         BUG_ON(dn->d_inode);
892
893         /* dn must be unhashed */
894         if (!d_unhashed(dn))
895                 d_drop(dn);
896         realdn = d_materialise_unique(dn, in);
897         if (IS_ERR(realdn)) {
898                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
899                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
900                 if (prehash)
901                         *prehash = false; /* don't rehash on error */
902                 dn = realdn; /* note realdn contains the error */
903                 goto out;
904         } else if (realdn) {
905                 dout("dn %p (%d) spliced with %p (%d) "
906                      "inode %p ino %llx.%llx\n",
907                      dn, dn->d_count,
908                      realdn, realdn->d_count,
909                      realdn->d_inode, ceph_vinop(realdn->d_inode));
910                 dput(dn);
911                 dn = realdn;
912         } else {
913                 BUG_ON(!ceph_dentry(dn));
914                 dout("dn %p attached to %p ino %llx.%llx\n",
915                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
916         }
917         if ((!prehash || *prehash) && d_unhashed(dn))
918                 d_rehash(dn);
919         if (set_offset)
920                 ceph_set_dentry_offset(dn);
921 out:
922         return dn;
923 }
924
925 /*
926  * Incorporate results into the local cache.  This is either just
927  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
928  * after a lookup).
929  *
930  * A reply may contain
931  *         a directory inode along with a dentry.
932  *  and/or a target inode
933  *
934  * Called with snap_rwsem (read).
935  */
936 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
937                     struct ceph_mds_session *session)
938 {
939         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
940         struct inode *in = NULL;
941         struct ceph_mds_reply_inode *ininfo;
942         struct ceph_vino vino;
943         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
944         int i = 0;
945         int err = 0;
946
947         dout("fill_trace %p is_dentry %d is_target %d\n", req,
948              rinfo->head->is_dentry, rinfo->head->is_target);
949
950 #if 0
951         /*
952          * Debugging hook:
953          *
954          * If we resend completed ops to a recovering mds, we get no
955          * trace.  Since that is very rare, pretend this is the case
956          * to ensure the 'no trace' handlers in the callers behave.
957          *
958          * Fill in inodes unconditionally to avoid breaking cap
959          * invariants.
960          */
961         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
962                 pr_info("fill_trace faking empty trace on %lld %s\n",
963                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
964                 if (rinfo->head->is_dentry) {
965                         rinfo->head->is_dentry = 0;
966                         err = fill_inode(req->r_locked_dir,
967                                          &rinfo->diri, rinfo->dirfrag,
968                                          session, req->r_request_started, -1);
969                 }
970                 if (rinfo->head->is_target) {
971                         rinfo->head->is_target = 0;
972                         ininfo = rinfo->targeti.in;
973                         vino.ino = le64_to_cpu(ininfo->ino);
974                         vino.snap = le64_to_cpu(ininfo->snapid);
975                         in = ceph_get_inode(sb, vino);
976                         err = fill_inode(in, &rinfo->targeti, NULL,
977                                          session, req->r_request_started,
978                                          req->r_fmode);
979                         iput(in);
980                 }
981         }
982 #endif
983
984         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
985                 dout("fill_trace reply is empty!\n");
986                 if (rinfo->head->result == 0 && req->r_locked_dir)
987                         ceph_invalidate_dir_request(req);
988                 return 0;
989         }
990
991         if (rinfo->head->is_dentry) {
992                 struct inode *dir = req->r_locked_dir;
993
994                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
995                                  session, req->r_request_started, -1,
996                                  &req->r_caps_reservation);
997                 if (err < 0)
998                         return err;
999         }
1000
1001         /*
1002          * ignore null lease/binding on snapdir ENOENT, or else we
1003          * will have trouble splicing in the virtual snapdir later
1004          */
1005         if (rinfo->head->is_dentry && !req->r_aborted &&
1006             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1007                                                fsc->mount_options->snapdir_name,
1008                                                req->r_dentry->d_name.len))) {
1009                 /*
1010                  * lookup link rename   : null -> possibly existing inode
1011                  * mknod symlink mkdir  : null -> new inode
1012                  * unlink               : linked -> null
1013                  */
1014                 struct inode *dir = req->r_locked_dir;
1015                 struct dentry *dn = req->r_dentry;
1016                 bool have_dir_cap, have_lease;
1017
1018                 BUG_ON(!dn);
1019                 BUG_ON(!dir);
1020                 BUG_ON(dn->d_parent->d_inode != dir);
1021                 BUG_ON(ceph_ino(dir) !=
1022                        le64_to_cpu(rinfo->diri.in->ino));
1023                 BUG_ON(ceph_snap(dir) !=
1024                        le64_to_cpu(rinfo->diri.in->snapid));
1025
1026                 /* do we have a lease on the whole dir? */
1027                 have_dir_cap =
1028                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1029                          CEPH_CAP_FILE_SHARED);
1030
1031                 /* do we have a dn lease? */
1032                 have_lease = have_dir_cap ||
1033                         le32_to_cpu(rinfo->dlease->duration_ms);
1034                 if (!have_lease)
1035                         dout("fill_trace  no dentry lease or dir cap\n");
1036
1037                 /* rename? */
1038                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1039                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1040                              req->r_old_dentry,
1041                              req->r_old_dentry->d_name.len,
1042                              req->r_old_dentry->d_name.name,
1043                              dn, dn->d_name.len, dn->d_name.name);
1044                         dout("fill_trace doing d_move %p -> %p\n",
1045                              req->r_old_dentry, dn);
1046
1047                         d_move(req->r_old_dentry, dn);
1048                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1049                              req->r_old_dentry,
1050                              req->r_old_dentry->d_name.len,
1051                              req->r_old_dentry->d_name.name,
1052                              dn, dn->d_name.len, dn->d_name.name);
1053
1054                         /* ensure target dentry is invalidated, despite
1055                            rehashing bug in vfs_rename_dir */
1056                         ceph_invalidate_dentry_lease(dn);
1057
1058                         /*
1059                          * d_move() puts the renamed dentry at the end of
1060                          * d_subdirs.  We need to assign it an appropriate
1061                          * directory offset so we can behave when holding
1062                          * D_COMPLETE.
1063                          */
1064                         ceph_set_dentry_offset(req->r_old_dentry);
1065                         dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1066                              ceph_dentry(req->r_old_dentry)->offset);
1067
1068                         dn = req->r_old_dentry;  /* use old_dentry */
1069                         in = dn->d_inode;
1070                 }
1071
1072                 /* null dentry? */
1073                 if (!rinfo->head->is_target) {
1074                         dout("fill_trace null dentry\n");
1075                         if (dn->d_inode) {
1076                                 dout("d_delete %p\n", dn);
1077                                 d_delete(dn);
1078                         } else {
1079                                 dout("d_instantiate %p NULL\n", dn);
1080                                 d_instantiate(dn, NULL);
1081                                 if (have_lease && d_unhashed(dn))
1082                                         d_rehash(dn);
1083                                 update_dentry_lease(dn, rinfo->dlease,
1084                                                     session,
1085                                                     req->r_request_started);
1086                         }
1087                         goto done;
1088                 }
1089
1090                 /* attach proper inode */
1091                 ininfo = rinfo->targeti.in;
1092                 vino.ino = le64_to_cpu(ininfo->ino);
1093                 vino.snap = le64_to_cpu(ininfo->snapid);
1094                 in = dn->d_inode;
1095                 if (!in) {
1096                         in = ceph_get_inode(sb, vino);
1097                         if (IS_ERR(in)) {
1098                                 pr_err("fill_trace bad get_inode "
1099                                        "%llx.%llx\n", vino.ino, vino.snap);
1100                                 err = PTR_ERR(in);
1101                                 d_delete(dn);
1102                                 goto done;
1103                         }
1104                         dn = splice_dentry(dn, in, &have_lease, true);
1105                         if (IS_ERR(dn)) {
1106                                 err = PTR_ERR(dn);
1107                                 goto done;
1108                         }
1109                         req->r_dentry = dn;  /* may have spliced */
1110                         ihold(in);
1111                 } else if (ceph_ino(in) == vino.ino &&
1112                            ceph_snap(in) == vino.snap) {
1113                         ihold(in);
1114                 } else {
1115                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1116                              dn, in, ceph_ino(in), ceph_snap(in),
1117                              vino.ino, vino.snap);
1118                         have_lease = false;
1119                         in = NULL;
1120                 }
1121
1122                 if (have_lease)
1123                         update_dentry_lease(dn, rinfo->dlease, session,
1124                                             req->r_request_started);
1125                 dout(" final dn %p\n", dn);
1126                 i++;
1127         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1128                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1129                 struct dentry *dn = req->r_dentry;
1130
1131                 /* fill out a snapdir LOOKUPSNAP dentry */
1132                 BUG_ON(!dn);
1133                 BUG_ON(!req->r_locked_dir);
1134                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1135                 ininfo = rinfo->targeti.in;
1136                 vino.ino = le64_to_cpu(ininfo->ino);
1137                 vino.snap = le64_to_cpu(ininfo->snapid);
1138                 in = ceph_get_inode(sb, vino);
1139                 if (IS_ERR(in)) {
1140                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1141                                vino.ino, vino.snap);
1142                         err = PTR_ERR(in);
1143                         d_delete(dn);
1144                         goto done;
1145                 }
1146                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1147                 dn = splice_dentry(dn, in, NULL, true);
1148                 if (IS_ERR(dn)) {
1149                         err = PTR_ERR(dn);
1150                         goto done;
1151                 }
1152                 req->r_dentry = dn;  /* may have spliced */
1153                 ihold(in);
1154                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1155         }
1156
1157         if (rinfo->head->is_target) {
1158                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1159                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1160
1161                 if (in == NULL || ceph_ino(in) != vino.ino ||
1162                     ceph_snap(in) != vino.snap) {
1163                         in = ceph_get_inode(sb, vino);
1164                         if (IS_ERR(in)) {
1165                                 err = PTR_ERR(in);
1166                                 goto done;
1167                         }
1168                 }
1169                 req->r_target_inode = in;
1170
1171                 err = fill_inode(in,
1172                                  &rinfo->targeti, NULL,
1173                                  session, req->r_request_started,
1174                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1175                                  req->r_fmode : -1,
1176                                  &req->r_caps_reservation);
1177                 if (err < 0) {
1178                         pr_err("fill_inode badness %p %llx.%llx\n",
1179                                in, ceph_vinop(in));
1180                         goto done;
1181                 }
1182         }
1183
1184 done:
1185         dout("fill_trace done err=%d\n", err);
1186         return err;
1187 }
1188
1189 /*
1190  * Prepopulate our cache with readdir results, leases, etc.
1191  */
1192 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1193                              struct ceph_mds_session *session)
1194 {
1195         struct dentry *parent = req->r_dentry;
1196         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1197         struct qstr dname;
1198         struct dentry *dn;
1199         struct inode *in;
1200         int err = 0, i;
1201         struct inode *snapdir = NULL;
1202         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1203         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1204         struct ceph_dentry_info *di;
1205
1206         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1207                 snapdir = ceph_get_snapdir(parent->d_inode);
1208                 parent = d_find_alias(snapdir);
1209                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1210                      rinfo->dir_nr, parent);
1211         } else {
1212                 dout("readdir_prepopulate %d items under dn %p\n",
1213                      rinfo->dir_nr, parent);
1214                 if (rinfo->dir_dir)
1215                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1216         }
1217
1218         for (i = 0; i < rinfo->dir_nr; i++) {
1219                 struct ceph_vino vino;
1220
1221                 dname.name = rinfo->dir_dname[i];
1222                 dname.len = rinfo->dir_dname_len[i];
1223                 dname.hash = full_name_hash(dname.name, dname.len);
1224
1225                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1226                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1227
1228 retry_lookup:
1229                 dn = d_lookup(parent, &dname);
1230                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1231                      parent, dname.len, dname.name, dn);
1232
1233                 if (!dn) {
1234                         dn = d_alloc(parent, &dname);
1235                         dout("d_alloc %p '%.*s' = %p\n", parent,
1236                              dname.len, dname.name, dn);
1237                         if (dn == NULL) {
1238                                 dout("d_alloc badness\n");
1239                                 err = -ENOMEM;
1240                                 goto out;
1241                         }
1242                         err = ceph_init_dentry(dn);
1243                         if (err < 0) {
1244                                 dput(dn);
1245                                 goto out;
1246                         }
1247                 } else if (dn->d_inode &&
1248                            (ceph_ino(dn->d_inode) != vino.ino ||
1249                             ceph_snap(dn->d_inode) != vino.snap)) {
1250                         dout(" dn %p points to wrong inode %p\n",
1251                              dn, dn->d_inode);
1252                         d_delete(dn);
1253                         dput(dn);
1254                         goto retry_lookup;
1255                 } else {
1256                         /* reorder parent's d_subdirs */
1257                         spin_lock(&parent->d_lock);
1258                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1259                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1260                         spin_unlock(&dn->d_lock);
1261                         spin_unlock(&parent->d_lock);
1262                 }
1263
1264                 di = dn->d_fsdata;
1265                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1266
1267                 /* inode */
1268                 if (dn->d_inode) {
1269                         in = dn->d_inode;
1270                 } else {
1271                         in = ceph_get_inode(parent->d_sb, vino);
1272                         if (IS_ERR(in)) {
1273                                 dout("new_inode badness\n");
1274                                 d_delete(dn);
1275                                 dput(dn);
1276                                 err = PTR_ERR(in);
1277                                 goto out;
1278                         }
1279                         dn = splice_dentry(dn, in, NULL, false);
1280                         if (IS_ERR(dn))
1281                                 dn = NULL;
1282                 }
1283
1284                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1285                                req->r_request_started, -1,
1286                                &req->r_caps_reservation) < 0) {
1287                         pr_err("fill_inode badness on %p\n", in);
1288                         goto next_item;
1289                 }
1290                 if (dn)
1291                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1292                                             req->r_session,
1293                                             req->r_request_started);
1294 next_item:
1295                 if (dn)
1296                         dput(dn);
1297         }
1298         req->r_did_prepopulate = true;
1299
1300 out:
1301         if (snapdir) {
1302                 iput(snapdir);
1303                 dput(parent);
1304         }
1305         dout("readdir_prepopulate done\n");
1306         return err;
1307 }
1308
1309 int ceph_inode_set_size(struct inode *inode, loff_t size)
1310 {
1311         struct ceph_inode_info *ci = ceph_inode(inode);
1312         int ret = 0;
1313
1314         spin_lock(&ci->i_ceph_lock);
1315         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1316         inode->i_size = size;
1317         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1318
1319         /* tell the MDS if we are approaching max_size */
1320         if ((size << 1) >= ci->i_max_size &&
1321             (ci->i_reported_size << 1) < ci->i_max_size)
1322                 ret = 1;
1323
1324         spin_unlock(&ci->i_ceph_lock);
1325         return ret;
1326 }
1327
1328 /*
1329  * Write back inode data in a worker thread.  (This can't be done
1330  * in the message handler context.)
1331  */
1332 void ceph_queue_writeback(struct inode *inode)
1333 {
1334         ihold(inode);
1335         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1336                        &ceph_inode(inode)->i_wb_work)) {
1337                 dout("ceph_queue_writeback %p\n", inode);
1338         } else {
1339                 dout("ceph_queue_writeback %p failed\n", inode);
1340                 iput(inode);
1341         }
1342 }
1343
1344 static void ceph_writeback_work(struct work_struct *work)
1345 {
1346         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1347                                                   i_wb_work);
1348         struct inode *inode = &ci->vfs_inode;
1349
1350         dout("writeback %p\n", inode);
1351         filemap_fdatawrite(&inode->i_data);
1352         iput(inode);
1353 }
1354
1355 /*
1356  * queue an async invalidation
1357  */
1358 void ceph_queue_invalidate(struct inode *inode)
1359 {
1360         ihold(inode);
1361         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1362                        &ceph_inode(inode)->i_pg_inv_work)) {
1363                 dout("ceph_queue_invalidate %p\n", inode);
1364         } else {
1365                 dout("ceph_queue_invalidate %p failed\n", inode);
1366                 iput(inode);
1367         }
1368 }
1369
1370 /*
1371  * Invalidate inode pages in a worker thread.  (This can't be done
1372  * in the message handler context.)
1373  */
1374 static void ceph_invalidate_work(struct work_struct *work)
1375 {
1376         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1377                                                   i_pg_inv_work);
1378         struct inode *inode = &ci->vfs_inode;
1379         u32 orig_gen;
1380         int check = 0;
1381
1382         spin_lock(&ci->i_ceph_lock);
1383         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1384              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1385         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1386                 /* nevermind! */
1387                 spin_unlock(&ci->i_ceph_lock);
1388                 goto out;
1389         }
1390         orig_gen = ci->i_rdcache_gen;
1391         spin_unlock(&ci->i_ceph_lock);
1392
1393         truncate_inode_pages(&inode->i_data, 0);
1394
1395         spin_lock(&ci->i_ceph_lock);
1396         if (orig_gen == ci->i_rdcache_gen &&
1397             orig_gen == ci->i_rdcache_revoking) {
1398                 dout("invalidate_pages %p gen %d successful\n", inode,
1399                      ci->i_rdcache_gen);
1400                 ci->i_rdcache_revoking--;
1401                 check = 1;
1402         } else {
1403                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1404                      inode, orig_gen, ci->i_rdcache_gen,
1405                      ci->i_rdcache_revoking);
1406         }
1407         spin_unlock(&ci->i_ceph_lock);
1408
1409         if (check)
1410                 ceph_check_caps(ci, 0, NULL);
1411 out:
1412         iput(inode);
1413 }
1414
1415
1416 /*
1417  * called by trunc_wq; take i_mutex ourselves
1418  *
1419  * We also truncate in a separate thread as well.
1420  */
1421 static void ceph_vmtruncate_work(struct work_struct *work)
1422 {
1423         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1424                                                   i_vmtruncate_work);
1425         struct inode *inode = &ci->vfs_inode;
1426
1427         dout("vmtruncate_work %p\n", inode);
1428         mutex_lock(&inode->i_mutex);
1429         __ceph_do_pending_vmtruncate(inode);
1430         mutex_unlock(&inode->i_mutex);
1431         iput(inode);
1432 }
1433
1434 /*
1435  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1436  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1437  */
1438 void ceph_queue_vmtruncate(struct inode *inode)
1439 {
1440         struct ceph_inode_info *ci = ceph_inode(inode);
1441
1442         ihold(inode);
1443         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1444                        &ci->i_vmtruncate_work)) {
1445                 dout("ceph_queue_vmtruncate %p\n", inode);
1446         } else {
1447                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1448                      inode, ci->i_truncate_pending);
1449                 iput(inode);
1450         }
1451 }
1452
1453 /*
1454  * called with i_mutex held.
1455  *
1456  * Make sure any pending truncation is applied before doing anything
1457  * that may depend on it.
1458  */
1459 void __ceph_do_pending_vmtruncate(struct inode *inode)
1460 {
1461         struct ceph_inode_info *ci = ceph_inode(inode);
1462         u64 to;
1463         int wrbuffer_refs, wake = 0;
1464
1465 retry:
1466         spin_lock(&ci->i_ceph_lock);
1467         if (ci->i_truncate_pending == 0) {
1468                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1469                 spin_unlock(&ci->i_ceph_lock);
1470                 return;
1471         }
1472
1473         /*
1474          * make sure any dirty snapped pages are flushed before we
1475          * possibly truncate them.. so write AND block!
1476          */
1477         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1478                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1479                      inode);
1480                 spin_unlock(&ci->i_ceph_lock);
1481                 filemap_write_and_wait_range(&inode->i_data, 0,
1482                                              inode->i_sb->s_maxbytes);
1483                 goto retry;
1484         }
1485
1486         to = ci->i_truncate_size;
1487         wrbuffer_refs = ci->i_wrbuffer_ref;
1488         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1489              ci->i_truncate_pending, to);
1490         spin_unlock(&ci->i_ceph_lock);
1491
1492         truncate_inode_pages(inode->i_mapping, to);
1493
1494         spin_lock(&ci->i_ceph_lock);
1495         ci->i_truncate_pending--;
1496         if (ci->i_truncate_pending == 0)
1497                 wake = 1;
1498         spin_unlock(&ci->i_ceph_lock);
1499
1500         if (wrbuffer_refs == 0)
1501                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1502         if (wake)
1503                 wake_up_all(&ci->i_cap_wq);
1504 }
1505
1506
1507 /*
1508  * symlinks
1509  */
1510 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1511 {
1512         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1513         nd_set_link(nd, ci->i_symlink);
1514         return NULL;
1515 }
1516
1517 static const struct inode_operations ceph_symlink_iops = {
1518         .readlink = generic_readlink,
1519         .follow_link = ceph_sym_follow_link,
1520 };
1521
1522 /*
1523  * setattr
1524  */
1525 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1526 {
1527         struct inode *inode = dentry->d_inode;
1528         struct ceph_inode_info *ci = ceph_inode(inode);
1529         struct inode *parent_inode;
1530         const unsigned int ia_valid = attr->ia_valid;
1531         struct ceph_mds_request *req;
1532         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1533         int issued;
1534         int release = 0, dirtied = 0;
1535         int mask = 0;
1536         int err = 0;
1537         int inode_dirty_flags = 0;
1538
1539         if (ceph_snap(inode) != CEPH_NOSNAP)
1540                 return -EROFS;
1541
1542         __ceph_do_pending_vmtruncate(inode);
1543
1544         err = inode_change_ok(inode, attr);
1545         if (err != 0)
1546                 return err;
1547
1548         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1549                                        USE_AUTH_MDS);
1550         if (IS_ERR(req))
1551                 return PTR_ERR(req);
1552
1553         spin_lock(&ci->i_ceph_lock);
1554         issued = __ceph_caps_issued(ci, NULL);
1555         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1556
1557         if (ia_valid & ATTR_UID) {
1558                 dout("setattr %p uid %d -> %d\n", inode,
1559                      inode->i_uid, attr->ia_uid);
1560                 if (issued & CEPH_CAP_AUTH_EXCL) {
1561                         inode->i_uid = attr->ia_uid;
1562                         dirtied |= CEPH_CAP_AUTH_EXCL;
1563                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1564                            attr->ia_uid != inode->i_uid) {
1565                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1566                         mask |= CEPH_SETATTR_UID;
1567                         release |= CEPH_CAP_AUTH_SHARED;
1568                 }
1569         }
1570         if (ia_valid & ATTR_GID) {
1571                 dout("setattr %p gid %d -> %d\n", inode,
1572                      inode->i_gid, attr->ia_gid);
1573                 if (issued & CEPH_CAP_AUTH_EXCL) {
1574                         inode->i_gid = attr->ia_gid;
1575                         dirtied |= CEPH_CAP_AUTH_EXCL;
1576                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1577                            attr->ia_gid != inode->i_gid) {
1578                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1579                         mask |= CEPH_SETATTR_GID;
1580                         release |= CEPH_CAP_AUTH_SHARED;
1581                 }
1582         }
1583         if (ia_valid & ATTR_MODE) {
1584                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1585                      attr->ia_mode);
1586                 if (issued & CEPH_CAP_AUTH_EXCL) {
1587                         inode->i_mode = attr->ia_mode;
1588                         dirtied |= CEPH_CAP_AUTH_EXCL;
1589                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1590                            attr->ia_mode != inode->i_mode) {
1591                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1592                         mask |= CEPH_SETATTR_MODE;
1593                         release |= CEPH_CAP_AUTH_SHARED;
1594                 }
1595         }
1596
1597         if (ia_valid & ATTR_ATIME) {
1598                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1599                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1600                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1601                 if (issued & CEPH_CAP_FILE_EXCL) {
1602                         ci->i_time_warp_seq++;
1603                         inode->i_atime = attr->ia_atime;
1604                         dirtied |= CEPH_CAP_FILE_EXCL;
1605                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1606                            timespec_compare(&inode->i_atime,
1607                                             &attr->ia_atime) < 0) {
1608                         inode->i_atime = attr->ia_atime;
1609                         dirtied |= CEPH_CAP_FILE_WR;
1610                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1611                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1612                         ceph_encode_timespec(&req->r_args.setattr.atime,
1613                                              &attr->ia_atime);
1614                         mask |= CEPH_SETATTR_ATIME;
1615                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1616                                 CEPH_CAP_FILE_WR;
1617                 }
1618         }
1619         if (ia_valid & ATTR_MTIME) {
1620                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1621                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1622                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1623                 if (issued & CEPH_CAP_FILE_EXCL) {
1624                         ci->i_time_warp_seq++;
1625                         inode->i_mtime = attr->ia_mtime;
1626                         dirtied |= CEPH_CAP_FILE_EXCL;
1627                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1628                            timespec_compare(&inode->i_mtime,
1629                                             &attr->ia_mtime) < 0) {
1630                         inode->i_mtime = attr->ia_mtime;
1631                         dirtied |= CEPH_CAP_FILE_WR;
1632                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1633                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1634                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1635                                              &attr->ia_mtime);
1636                         mask |= CEPH_SETATTR_MTIME;
1637                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1638                                 CEPH_CAP_FILE_WR;
1639                 }
1640         }
1641         if (ia_valid & ATTR_SIZE) {
1642                 dout("setattr %p size %lld -> %lld\n", inode,
1643                      inode->i_size, attr->ia_size);
1644                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1645                         err = -EINVAL;
1646                         goto out;
1647                 }
1648                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1649                     attr->ia_size > inode->i_size) {
1650                         inode->i_size = attr->ia_size;
1651                         inode->i_blocks =
1652                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1653                         inode->i_ctime = attr->ia_ctime;
1654                         ci->i_reported_size = attr->ia_size;
1655                         dirtied |= CEPH_CAP_FILE_EXCL;
1656                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1657                            attr->ia_size != inode->i_size) {
1658                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1659                         req->r_args.setattr.old_size =
1660                                 cpu_to_le64(inode->i_size);
1661                         mask |= CEPH_SETATTR_SIZE;
1662                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1663                                 CEPH_CAP_FILE_WR;
1664                 }
1665         }
1666
1667         /* these do nothing */
1668         if (ia_valid & ATTR_CTIME) {
1669                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1670                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1671                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1672                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1673                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1674                      only ? "ctime only" : "ignored");
1675                 inode->i_ctime = attr->ia_ctime;
1676                 if (only) {
1677                         /*
1678                          * if kernel wants to dirty ctime but nothing else,
1679                          * we need to choose a cap to dirty under, or do
1680                          * a almost-no-op setattr
1681                          */
1682                         if (issued & CEPH_CAP_AUTH_EXCL)
1683                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1684                         else if (issued & CEPH_CAP_FILE_EXCL)
1685                                 dirtied |= CEPH_CAP_FILE_EXCL;
1686                         else if (issued & CEPH_CAP_XATTR_EXCL)
1687                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1688                         else
1689                                 mask |= CEPH_SETATTR_CTIME;
1690                 }
1691         }
1692         if (ia_valid & ATTR_FILE)
1693                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1694
1695         if (dirtied) {
1696                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1697                 inode->i_ctime = CURRENT_TIME;
1698         }
1699
1700         release &= issued;
1701         spin_unlock(&ci->i_ceph_lock);
1702
1703         if (inode_dirty_flags)
1704                 __mark_inode_dirty(inode, inode_dirty_flags);
1705
1706         if (mask) {
1707                 req->r_inode = inode;
1708                 ihold(inode);
1709                 req->r_inode_drop = release;
1710                 req->r_args.setattr.mask = cpu_to_le32(mask);
1711                 req->r_num_caps = 1;
1712                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1713                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1714                 iput(parent_inode);
1715         }
1716         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1717              ceph_cap_string(dirtied), mask);
1718
1719         ceph_mdsc_put_request(req);
1720         __ceph_do_pending_vmtruncate(inode);
1721         return err;
1722 out:
1723         spin_unlock(&ci->i_ceph_lock);
1724         ceph_mdsc_put_request(req);
1725         return err;
1726 }
1727
1728 /*
1729  * Verify that we have a lease on the given mask.  If not,
1730  * do a getattr against an mds.
1731  */
1732 int ceph_do_getattr(struct inode *inode, int mask)
1733 {
1734         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1735         struct ceph_mds_client *mdsc = fsc->mdsc;
1736         struct ceph_mds_request *req;
1737         int err;
1738
1739         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1740                 dout("do_getattr inode %p SNAPDIR\n", inode);
1741                 return 0;
1742         }
1743
1744         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1745         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1746                 return 0;
1747
1748         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1749         if (IS_ERR(req))
1750                 return PTR_ERR(req);
1751         req->r_inode = inode;
1752         ihold(inode);
1753         req->r_num_caps = 1;
1754         req->r_args.getattr.mask = cpu_to_le32(mask);
1755         err = ceph_mdsc_do_request(mdsc, NULL, req);
1756         ceph_mdsc_put_request(req);
1757         dout("do_getattr result=%d\n", err);
1758         return err;
1759 }
1760
1761
1762 /*
1763  * Check inode permissions.  We verify we have a valid value for
1764  * the AUTH cap, then call the generic handler.
1765  */
1766 int ceph_permission(struct inode *inode, int mask)
1767 {
1768         int err;
1769
1770         if (mask & MAY_NOT_BLOCK)
1771                 return -ECHILD;
1772
1773         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1774
1775         if (!err)
1776                 err = generic_permission(inode, mask);
1777         return err;
1778 }
1779
1780 /*
1781  * Get all attributes.  Hopefully somedata we'll have a statlite()
1782  * and can limit the fields we require to be accurate.
1783  */
1784 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1785                  struct kstat *stat)
1786 {
1787         struct inode *inode = dentry->d_inode;
1788         struct ceph_inode_info *ci = ceph_inode(inode);
1789         int err;
1790
1791         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1792         if (!err) {
1793                 generic_fillattr(inode, stat);
1794                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1795                 if (ceph_snap(inode) != CEPH_NOSNAP)
1796                         stat->dev = ceph_snap(inode);
1797                 else
1798                         stat->dev = 0;
1799                 if (S_ISDIR(inode->i_mode)) {
1800                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1801                                                 RBYTES))
1802                                 stat->size = ci->i_rbytes;
1803                         else
1804                                 stat->size = ci->i_files + ci->i_subdirs;
1805                         stat->blocks = 0;
1806                         stat->blksize = 65536;
1807                 }
1808         }
1809         return err;
1810 }