116f36502f178f5ce0475bdfdd77073e9452e614
[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         ci->i_version = 0;
301         ci->i_time_warp_seq = 0;
302         ci->i_ceph_flags = 0;
303         ci->i_release_count = 0;
304         ci->i_symlink = NULL;
305
306         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
307
308         ci->i_fragtree = RB_ROOT;
309         mutex_init(&ci->i_fragtree_mutex);
310
311         ci->i_xattrs.blob = NULL;
312         ci->i_xattrs.prealloc_blob = NULL;
313         ci->i_xattrs.dirty = false;
314         ci->i_xattrs.index = RB_ROOT;
315         ci->i_xattrs.count = 0;
316         ci->i_xattrs.names_size = 0;
317         ci->i_xattrs.vals_size = 0;
318         ci->i_xattrs.version = 0;
319         ci->i_xattrs.index_version = 0;
320
321         ci->i_caps = RB_ROOT;
322         ci->i_auth_cap = NULL;
323         ci->i_dirty_caps = 0;
324         ci->i_flushing_caps = 0;
325         INIT_LIST_HEAD(&ci->i_dirty_item);
326         INIT_LIST_HEAD(&ci->i_flushing_item);
327         ci->i_cap_flush_seq = 0;
328         ci->i_cap_flush_last_tid = 0;
329         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
330         init_waitqueue_head(&ci->i_cap_wq);
331         ci->i_hold_caps_min = 0;
332         ci->i_hold_caps_max = 0;
333         INIT_LIST_HEAD(&ci->i_cap_delay_list);
334         ci->i_cap_exporting_mds = 0;
335         ci->i_cap_exporting_mseq = 0;
336         ci->i_cap_exporting_issued = 0;
337         INIT_LIST_HEAD(&ci->i_cap_snaps);
338         ci->i_head_snapc = NULL;
339         ci->i_snap_caps = 0;
340
341         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
342                 ci->i_nr_by_mode[i] = 0;
343
344         ci->i_truncate_seq = 0;
345         ci->i_truncate_size = 0;
346         ci->i_truncate_pending = 0;
347
348         ci->i_max_size = 0;
349         ci->i_reported_size = 0;
350         ci->i_wanted_max_size = 0;
351         ci->i_requested_max_size = 0;
352
353         ci->i_pin_ref = 0;
354         ci->i_rd_ref = 0;
355         ci->i_rdcache_ref = 0;
356         ci->i_wr_ref = 0;
357         ci->i_wb_ref = 0;
358         ci->i_wrbuffer_ref = 0;
359         ci->i_wrbuffer_ref_head = 0;
360         ci->i_shared_gen = 0;
361         ci->i_rdcache_gen = 0;
362         ci->i_rdcache_revoking = 0;
363
364         INIT_LIST_HEAD(&ci->i_unsafe_writes);
365         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
366         spin_lock_init(&ci->i_unsafe_lock);
367
368         ci->i_snap_realm = NULL;
369         INIT_LIST_HEAD(&ci->i_snap_realm_item);
370         INIT_LIST_HEAD(&ci->i_snap_flush_item);
371
372         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
373         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
374
375         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
376
377         return &ci->vfs_inode;
378 }
379
380 static void ceph_i_callback(struct rcu_head *head)
381 {
382         struct inode *inode = container_of(head, struct inode, i_rcu);
383         struct ceph_inode_info *ci = ceph_inode(inode);
384
385         INIT_LIST_HEAD(&inode->i_dentry);
386         kmem_cache_free(ceph_inode_cachep, ci);
387 }
388
389 void ceph_destroy_inode(struct inode *inode)
390 {
391         struct ceph_inode_info *ci = ceph_inode(inode);
392         struct ceph_inode_frag *frag;
393         struct rb_node *n;
394
395         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
396
397         ceph_queue_caps_release(inode);
398
399         /*
400          * we may still have a snap_realm reference if there are stray
401          * caps in i_cap_exporting_issued or i_snap_caps.
402          */
403         if (ci->i_snap_realm) {
404                 struct ceph_mds_client *mdsc =
405                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
406                 struct ceph_snap_realm *realm = ci->i_snap_realm;
407
408                 dout(" dropping residual ref to snap realm %p\n", realm);
409                 spin_lock(&realm->inodes_with_caps_lock);
410                 list_del_init(&ci->i_snap_realm_item);
411                 spin_unlock(&realm->inodes_with_caps_lock);
412                 ceph_put_snap_realm(mdsc, realm);
413         }
414
415         kfree(ci->i_symlink);
416         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
417                 frag = rb_entry(n, struct ceph_inode_frag, node);
418                 rb_erase(n, &ci->i_fragtree);
419                 kfree(frag);
420         }
421
422         __ceph_destroy_xattrs(ci);
423         if (ci->i_xattrs.blob)
424                 ceph_buffer_put(ci->i_xattrs.blob);
425         if (ci->i_xattrs.prealloc_blob)
426                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
427
428         call_rcu(&inode->i_rcu, ceph_i_callback);
429 }
430
431
432 /*
433  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
434  * careful because either the client or MDS may have more up to date
435  * info, depending on which capabilities are held, and whether
436  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
437  * and size are monotonically increasing, except when utimes() or
438  * truncate() increments the corresponding _seq values.)
439  */
440 int ceph_fill_file_size(struct inode *inode, int issued,
441                         u32 truncate_seq, u64 truncate_size, u64 size)
442 {
443         struct ceph_inode_info *ci = ceph_inode(inode);
444         int queue_trunc = 0;
445
446         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
447             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
448                 dout("size %lld -> %llu\n", inode->i_size, size);
449                 inode->i_size = size;
450                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
451                 ci->i_reported_size = size;
452                 if (truncate_seq != ci->i_truncate_seq) {
453                         dout("truncate_seq %u -> %u\n",
454                              ci->i_truncate_seq, truncate_seq);
455                         ci->i_truncate_seq = truncate_seq;
456                         /*
457                          * If we hold relevant caps, or in the case where we're
458                          * not the only client referencing this file and we
459                          * don't hold those caps, then we need to check whether
460                          * the file is either opened or mmaped
461                          */
462                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
463                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
464                                        CEPH_CAP_FILE_EXCL|
465                                        CEPH_CAP_FILE_LAZYIO)) ||
466                             mapping_mapped(inode->i_mapping) ||
467                             __ceph_caps_file_wanted(ci)) {
468                                 ci->i_truncate_pending++;
469                                 queue_trunc = 1;
470                         }
471                 }
472         }
473         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
474             ci->i_truncate_size != truncate_size) {
475                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
476                      truncate_size);
477                 ci->i_truncate_size = truncate_size;
478         }
479         return queue_trunc;
480 }
481
482 void ceph_fill_file_time(struct inode *inode, int issued,
483                          u64 time_warp_seq, struct timespec *ctime,
484                          struct timespec *mtime, struct timespec *atime)
485 {
486         struct ceph_inode_info *ci = ceph_inode(inode);
487         int warn = 0;
488
489         if (issued & (CEPH_CAP_FILE_EXCL|
490                       CEPH_CAP_FILE_WR|
491                       CEPH_CAP_FILE_BUFFER|
492                       CEPH_CAP_AUTH_EXCL|
493                       CEPH_CAP_XATTR_EXCL)) {
494                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
495                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
496                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
497                              ctime->tv_sec, ctime->tv_nsec);
498                         inode->i_ctime = *ctime;
499                 }
500                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
501                         /* the MDS did a utimes() */
502                         dout("mtime %ld.%09ld -> %ld.%09ld "
503                              "tw %d -> %d\n",
504                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
505                              mtime->tv_sec, mtime->tv_nsec,
506                              ci->i_time_warp_seq, (int)time_warp_seq);
507
508                         inode->i_mtime = *mtime;
509                         inode->i_atime = *atime;
510                         ci->i_time_warp_seq = time_warp_seq;
511                 } else if (time_warp_seq == ci->i_time_warp_seq) {
512                         /* nobody did utimes(); take the max */
513                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
514                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
515                                      inode->i_mtime.tv_sec,
516                                      inode->i_mtime.tv_nsec,
517                                      mtime->tv_sec, mtime->tv_nsec);
518                                 inode->i_mtime = *mtime;
519                         }
520                         if (timespec_compare(atime, &inode->i_atime) > 0) {
521                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
522                                      inode->i_atime.tv_sec,
523                                      inode->i_atime.tv_nsec,
524                                      atime->tv_sec, atime->tv_nsec);
525                                 inode->i_atime = *atime;
526                         }
527                 } else if (issued & CEPH_CAP_FILE_EXCL) {
528                         /* we did a utimes(); ignore mds values */
529                 } else {
530                         warn = 1;
531                 }
532         } else {
533                 /* we have no write|excl caps; whatever the MDS says is true */
534                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
535                         inode->i_ctime = *ctime;
536                         inode->i_mtime = *mtime;
537                         inode->i_atime = *atime;
538                         ci->i_time_warp_seq = time_warp_seq;
539                 } else {
540                         warn = 1;
541                 }
542         }
543         if (warn) /* time_warp_seq shouldn't go backwards */
544                 dout("%p mds time_warp_seq %llu < %u\n",
545                      inode, time_warp_seq, ci->i_time_warp_seq);
546 }
547
548 /*
549  * Populate an inode based on info from mds.  May be called on new or
550  * existing inodes.
551  */
552 static int fill_inode(struct inode *inode,
553                       struct ceph_mds_reply_info_in *iinfo,
554                       struct ceph_mds_reply_dirfrag *dirinfo,
555                       struct ceph_mds_session *session,
556                       unsigned long ttl_from, int cap_fmode,
557                       struct ceph_cap_reservation *caps_reservation)
558 {
559         struct ceph_mds_reply_inode *info = iinfo->in;
560         struct ceph_inode_info *ci = ceph_inode(inode);
561         int i;
562         int issued = 0, implemented;
563         int updating_inode = 0;
564         struct timespec mtime, atime, ctime;
565         u32 nsplits;
566         struct ceph_buffer *xattr_blob = NULL;
567         int err = 0;
568         int queue_trunc = 0;
569
570         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
571              inode, ceph_vinop(inode), le64_to_cpu(info->version),
572              ci->i_version);
573
574         /*
575          * prealloc xattr data, if it looks like we'll need it.  only
576          * if len > 4 (meaning there are actually xattrs; the first 4
577          * bytes are the xattr count).
578          */
579         if (iinfo->xattr_len > 4) {
580                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
581                 if (!xattr_blob)
582                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
583                                iinfo->xattr_len);
584         }
585
586         spin_lock(&inode->i_lock);
587
588         /*
589          * provided version will be odd if inode value is projected,
590          * even if stable.  skip the update if we have newer stable
591          * info (ours>=theirs, e.g. due to racing mds replies), unless
592          * we are getting projected (unstable) info (in which case the
593          * version is odd, and we want ours>theirs).
594          *   us   them
595          *   2    2     skip
596          *   3    2     skip
597          *   3    3     update
598          */
599         if (le64_to_cpu(info->version) > 0 &&
600             (ci->i_version & ~1) >= le64_to_cpu(info->version))
601                 goto no_change;
602         
603         updating_inode = 1;
604         issued = __ceph_caps_issued(ci, &implemented);
605         issued |= implemented | __ceph_caps_dirty(ci);
606
607         /* update inode */
608         ci->i_version = le64_to_cpu(info->version);
609         inode->i_version++;
610         inode->i_rdev = le32_to_cpu(info->rdev);
611
612         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
613                 inode->i_mode = le32_to_cpu(info->mode);
614                 inode->i_uid = le32_to_cpu(info->uid);
615                 inode->i_gid = le32_to_cpu(info->gid);
616                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
617                      inode->i_uid, inode->i_gid);
618         }
619
620         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
621                 set_nlink(inode, le32_to_cpu(info->nlink));
622
623         /* be careful with mtime, atime, size */
624         ceph_decode_timespec(&atime, &info->atime);
625         ceph_decode_timespec(&mtime, &info->mtime);
626         ceph_decode_timespec(&ctime, &info->ctime);
627         queue_trunc = ceph_fill_file_size(inode, issued,
628                                           le32_to_cpu(info->truncate_seq),
629                                           le64_to_cpu(info->truncate_size),
630                                           le64_to_cpu(info->size));
631         ceph_fill_file_time(inode, issued,
632                             le32_to_cpu(info->time_warp_seq),
633                             &ctime, &mtime, &atime);
634
635         /* only update max_size on auth cap */
636         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
637             ci->i_max_size != le64_to_cpu(info->max_size)) {
638                 dout("max_size %lld -> %llu\n", ci->i_max_size,
639                      le64_to_cpu(info->max_size));
640                 ci->i_max_size = le64_to_cpu(info->max_size);
641         }
642
643         ci->i_layout = info->layout;
644         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
645
646         /* xattrs */
647         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
648         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
649             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
650                 if (ci->i_xattrs.blob)
651                         ceph_buffer_put(ci->i_xattrs.blob);
652                 ci->i_xattrs.blob = xattr_blob;
653                 if (xattr_blob)
654                         memcpy(ci->i_xattrs.blob->vec.iov_base,
655                                iinfo->xattr_data, iinfo->xattr_len);
656                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
657                 xattr_blob = NULL;
658         }
659
660         inode->i_mapping->a_ops = &ceph_aops;
661         inode->i_mapping->backing_dev_info =
662                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
663
664         switch (inode->i_mode & S_IFMT) {
665         case S_IFIFO:
666         case S_IFBLK:
667         case S_IFCHR:
668         case S_IFSOCK:
669                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
670                 inode->i_op = &ceph_file_iops;
671                 break;
672         case S_IFREG:
673                 inode->i_op = &ceph_file_iops;
674                 inode->i_fop = &ceph_file_fops;
675                 break;
676         case S_IFLNK:
677                 inode->i_op = &ceph_symlink_iops;
678                 if (!ci->i_symlink) {
679                         int symlen = iinfo->symlink_len;
680                         char *sym;
681
682                         BUG_ON(symlen != inode->i_size);
683                         spin_unlock(&inode->i_lock);
684
685                         err = -ENOMEM;
686                         sym = kmalloc(symlen+1, GFP_NOFS);
687                         if (!sym)
688                                 goto out;
689                         memcpy(sym, iinfo->symlink, symlen);
690                         sym[symlen] = 0;
691
692                         spin_lock(&inode->i_lock);
693                         if (!ci->i_symlink)
694                                 ci->i_symlink = sym;
695                         else
696                                 kfree(sym); /* lost a race */
697                 }
698                 break;
699         case S_IFDIR:
700                 inode->i_op = &ceph_dir_iops;
701                 inode->i_fop = &ceph_dir_fops;
702
703                 ci->i_dir_layout = iinfo->dir_layout;
704
705                 ci->i_files = le64_to_cpu(info->files);
706                 ci->i_subdirs = le64_to_cpu(info->subdirs);
707                 ci->i_rbytes = le64_to_cpu(info->rbytes);
708                 ci->i_rfiles = le64_to_cpu(info->rfiles);
709                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
710                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
711                 break;
712         default:
713                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
714                        ceph_vinop(inode), inode->i_mode);
715         }
716
717 no_change:
718         spin_unlock(&inode->i_lock);
719
720         /* queue truncate if we saw i_size decrease */
721         if (queue_trunc)
722                 ceph_queue_vmtruncate(inode);
723
724         /* populate frag tree */
725         /* FIXME: move me up, if/when version reflects fragtree changes */
726         nsplits = le32_to_cpu(info->fragtree.nsplits);
727         mutex_lock(&ci->i_fragtree_mutex);
728         for (i = 0; i < nsplits; i++) {
729                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
730                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
731
732                 if (IS_ERR(frag))
733                         continue;
734                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
735                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
736         }
737         mutex_unlock(&ci->i_fragtree_mutex);
738
739         /* were we issued a capability? */
740         if (info->cap.caps) {
741                 if (ceph_snap(inode) == CEPH_NOSNAP) {
742                         ceph_add_cap(inode, session,
743                                      le64_to_cpu(info->cap.cap_id),
744                                      cap_fmode,
745                                      le32_to_cpu(info->cap.caps),
746                                      le32_to_cpu(info->cap.wanted),
747                                      le32_to_cpu(info->cap.seq),
748                                      le32_to_cpu(info->cap.mseq),
749                                      le64_to_cpu(info->cap.realm),
750                                      info->cap.flags,
751                                      caps_reservation);
752                 } else {
753                         spin_lock(&inode->i_lock);
754                         dout(" %p got snap_caps %s\n", inode,
755                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
756                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
757                         if (cap_fmode >= 0)
758                                 __ceph_get_fmode(ci, cap_fmode);
759                         spin_unlock(&inode->i_lock);
760                 }
761         } else if (cap_fmode >= 0) {
762                 pr_warning("mds issued no caps on %llx.%llx\n",
763                            ceph_vinop(inode));
764                 __ceph_get_fmode(ci, cap_fmode);
765         }
766
767         /* set dir completion flag? */
768         if (S_ISDIR(inode->i_mode) &&
769             updating_inode &&                 /* didn't jump to no_change */
770             ci->i_files == 0 && ci->i_subdirs == 0 &&
771             ceph_snap(inode) == CEPH_NOSNAP &&
772             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
773             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
774             !ceph_dir_test_complete(inode)) {
775                 dout(" marking %p complete (empty)\n", inode);
776                 ceph_dir_set_complete(inode);
777                 ci->i_max_offset = 2;
778         }
779
780         /* update delegation info? */
781         if (dirinfo)
782                 ceph_fill_dirfrag(inode, dirinfo);
783
784         err = 0;
785
786 out:
787         if (xattr_blob)
788                 ceph_buffer_put(xattr_blob);
789         return err;
790 }
791
792 /*
793  * caller should hold session s_mutex.
794  */
795 static void update_dentry_lease(struct dentry *dentry,
796                                 struct ceph_mds_reply_lease *lease,
797                                 struct ceph_mds_session *session,
798                                 unsigned long from_time)
799 {
800         struct ceph_dentry_info *di = ceph_dentry(dentry);
801         long unsigned duration = le32_to_cpu(lease->duration_ms);
802         long unsigned ttl = from_time + (duration * HZ) / 1000;
803         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
804         struct inode *dir;
805
806         /* only track leases on regular dentries */
807         if (dentry->d_op != &ceph_dentry_ops)
808                 return;
809
810         spin_lock(&dentry->d_lock);
811         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
812              dentry, duration, ttl);
813
814         /* make lease_rdcache_gen match directory */
815         dir = dentry->d_parent->d_inode;
816         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
817
818         if (duration == 0)
819                 goto out_unlock;
820
821         if (di->lease_gen == session->s_cap_gen &&
822             time_before(ttl, dentry->d_time))
823                 goto out_unlock;  /* we already have a newer lease. */
824
825         if (di->lease_session && di->lease_session != session)
826                 goto out_unlock;
827
828         ceph_dentry_lru_touch(dentry);
829
830         if (!di->lease_session)
831                 di->lease_session = ceph_get_mds_session(session);
832         di->lease_gen = session->s_cap_gen;
833         di->lease_seq = le32_to_cpu(lease->seq);
834         di->lease_renew_after = half_ttl;
835         di->lease_renew_from = 0;
836         dentry->d_time = ttl;
837 out_unlock:
838         spin_unlock(&dentry->d_lock);
839         return;
840 }
841
842 /*
843  * Set dentry's directory position based on the current dir's max, and
844  * order it in d_subdirs, so that dcache_readdir behaves.
845  *
846  * Always called under directory's i_mutex.
847  */
848 static void ceph_set_dentry_offset(struct dentry *dn)
849 {
850         struct dentry *dir = dn->d_parent;
851         struct inode *inode = dir->d_inode;
852         struct ceph_dentry_info *di;
853
854         BUG_ON(!inode);
855
856         di = ceph_dentry(dn);
857
858         spin_lock(&inode->i_lock);
859         if (!ceph_dir_test_complete(inode)) {
860                 spin_unlock(&inode->i_lock);
861                 return;
862         }
863         di->offset = ceph_inode(inode)->i_max_offset++;
864         spin_unlock(&inode->i_lock);
865
866         spin_lock(&dir->d_lock);
867         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
868         list_move(&dn->d_u.d_child, &dir->d_subdirs);
869         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
870              dn->d_u.d_child.prev, dn->d_u.d_child.next);
871         spin_unlock(&dn->d_lock);
872         spin_unlock(&dir->d_lock);
873 }
874
875 /*
876  * splice a dentry to an inode.
877  * caller must hold directory i_mutex for this to be safe.
878  *
879  * we will only rehash the resulting dentry if @prehash is
880  * true; @prehash will be set to false (for the benefit of
881  * the caller) if we fail.
882  */
883 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
884                                     bool *prehash, bool set_offset)
885 {
886         struct dentry *realdn;
887
888         BUG_ON(dn->d_inode);
889
890         /* dn must be unhashed */
891         if (!d_unhashed(dn))
892                 d_drop(dn);
893         realdn = d_materialise_unique(dn, in);
894         if (IS_ERR(realdn)) {
895                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
896                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
897                 if (prehash)
898                         *prehash = false; /* don't rehash on error */
899                 dn = realdn; /* note realdn contains the error */
900                 goto out;
901         } else if (realdn) {
902                 dout("dn %p (%d) spliced with %p (%d) "
903                      "inode %p ino %llx.%llx\n",
904                      dn, dn->d_count,
905                      realdn, realdn->d_count,
906                      realdn->d_inode, ceph_vinop(realdn->d_inode));
907                 dput(dn);
908                 dn = realdn;
909         } else {
910                 BUG_ON(!ceph_dentry(dn));
911                 dout("dn %p attached to %p ino %llx.%llx\n",
912                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
913         }
914         if ((!prehash || *prehash) && d_unhashed(dn))
915                 d_rehash(dn);
916         if (set_offset)
917                 ceph_set_dentry_offset(dn);
918 out:
919         return dn;
920 }
921
922 /*
923  * Incorporate results into the local cache.  This is either just
924  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
925  * after a lookup).
926  *
927  * A reply may contain
928  *         a directory inode along with a dentry.
929  *  and/or a target inode
930  *
931  * Called with snap_rwsem (read).
932  */
933 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
934                     struct ceph_mds_session *session)
935 {
936         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
937         struct inode *in = NULL;
938         struct ceph_mds_reply_inode *ininfo;
939         struct ceph_vino vino;
940         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
941         int i = 0;
942         int err = 0;
943
944         dout("fill_trace %p is_dentry %d is_target %d\n", req,
945              rinfo->head->is_dentry, rinfo->head->is_target);
946
947 #if 0
948         /*
949          * Debugging hook:
950          *
951          * If we resend completed ops to a recovering mds, we get no
952          * trace.  Since that is very rare, pretend this is the case
953          * to ensure the 'no trace' handlers in the callers behave.
954          *
955          * Fill in inodes unconditionally to avoid breaking cap
956          * invariants.
957          */
958         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
959                 pr_info("fill_trace faking empty trace on %lld %s\n",
960                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
961                 if (rinfo->head->is_dentry) {
962                         rinfo->head->is_dentry = 0;
963                         err = fill_inode(req->r_locked_dir,
964                                          &rinfo->diri, rinfo->dirfrag,
965                                          session, req->r_request_started, -1);
966                 }
967                 if (rinfo->head->is_target) {
968                         rinfo->head->is_target = 0;
969                         ininfo = rinfo->targeti.in;
970                         vino.ino = le64_to_cpu(ininfo->ino);
971                         vino.snap = le64_to_cpu(ininfo->snapid);
972                         in = ceph_get_inode(sb, vino);
973                         err = fill_inode(in, &rinfo->targeti, NULL,
974                                          session, req->r_request_started,
975                                          req->r_fmode);
976                         iput(in);
977                 }
978         }
979 #endif
980
981         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
982                 dout("fill_trace reply is empty!\n");
983                 if (rinfo->head->result == 0 && req->r_locked_dir)
984                         ceph_invalidate_dir_request(req);
985                 return 0;
986         }
987
988         if (rinfo->head->is_dentry) {
989                 struct inode *dir = req->r_locked_dir;
990
991                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
992                                  session, req->r_request_started, -1,
993                                  &req->r_caps_reservation);
994                 if (err < 0)
995                         return err;
996         }
997
998         /*
999          * ignore null lease/binding on snapdir ENOENT, or else we
1000          * will have trouble splicing in the virtual snapdir later
1001          */
1002         if (rinfo->head->is_dentry && !req->r_aborted &&
1003             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1004                                                fsc->mount_options->snapdir_name,
1005                                                req->r_dentry->d_name.len))) {
1006                 /*
1007                  * lookup link rename   : null -> possibly existing inode
1008                  * mknod symlink mkdir  : null -> new inode
1009                  * unlink               : linked -> null
1010                  */
1011                 struct inode *dir = req->r_locked_dir;
1012                 struct dentry *dn = req->r_dentry;
1013                 bool have_dir_cap, have_lease;
1014
1015                 BUG_ON(!dn);
1016                 BUG_ON(!dir);
1017                 BUG_ON(dn->d_parent->d_inode != dir);
1018                 BUG_ON(ceph_ino(dir) !=
1019                        le64_to_cpu(rinfo->diri.in->ino));
1020                 BUG_ON(ceph_snap(dir) !=
1021                        le64_to_cpu(rinfo->diri.in->snapid));
1022
1023                 /* do we have a lease on the whole dir? */
1024                 have_dir_cap =
1025                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1026                          CEPH_CAP_FILE_SHARED);
1027
1028                 /* do we have a dn lease? */
1029                 have_lease = have_dir_cap ||
1030                         le32_to_cpu(rinfo->dlease->duration_ms);
1031                 if (!have_lease)
1032                         dout("fill_trace  no dentry lease or dir cap\n");
1033
1034                 /* rename? */
1035                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1036                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1037                              req->r_old_dentry,
1038                              req->r_old_dentry->d_name.len,
1039                              req->r_old_dentry->d_name.name,
1040                              dn, dn->d_name.len, dn->d_name.name);
1041                         dout("fill_trace doing d_move %p -> %p\n",
1042                              req->r_old_dentry, dn);
1043
1044                         d_move(req->r_old_dentry, dn);
1045                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1046                              req->r_old_dentry,
1047                              req->r_old_dentry->d_name.len,
1048                              req->r_old_dentry->d_name.name,
1049                              dn, dn->d_name.len, dn->d_name.name);
1050
1051                         /* ensure target dentry is invalidated, despite
1052                            rehashing bug in vfs_rename_dir */
1053                         ceph_invalidate_dentry_lease(dn);
1054
1055                         /*
1056                          * d_move() puts the renamed dentry at the end of
1057                          * d_subdirs.  We need to assign it an appropriate
1058                          * directory offset so we can behave when holding
1059                          * D_COMPLETE.
1060                          */
1061                         ceph_set_dentry_offset(req->r_old_dentry);
1062                         dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1063                              ceph_dentry(req->r_old_dentry)->offset);
1064
1065                         dn = req->r_old_dentry;  /* use old_dentry */
1066                         in = dn->d_inode;
1067                 }
1068
1069                 /* null dentry? */
1070                 if (!rinfo->head->is_target) {
1071                         dout("fill_trace null dentry\n");
1072                         if (dn->d_inode) {
1073                                 dout("d_delete %p\n", dn);
1074                                 d_delete(dn);
1075                         } else {
1076                                 dout("d_instantiate %p NULL\n", dn);
1077                                 d_instantiate(dn, NULL);
1078                                 if (have_lease && d_unhashed(dn))
1079                                         d_rehash(dn);
1080                                 update_dentry_lease(dn, rinfo->dlease,
1081                                                     session,
1082                                                     req->r_request_started);
1083                         }
1084                         goto done;
1085                 }
1086
1087                 /* attach proper inode */
1088                 ininfo = rinfo->targeti.in;
1089                 vino.ino = le64_to_cpu(ininfo->ino);
1090                 vino.snap = le64_to_cpu(ininfo->snapid);
1091                 in = dn->d_inode;
1092                 if (!in) {
1093                         in = ceph_get_inode(sb, vino);
1094                         if (IS_ERR(in)) {
1095                                 pr_err("fill_trace bad get_inode "
1096                                        "%llx.%llx\n", vino.ino, vino.snap);
1097                                 err = PTR_ERR(in);
1098                                 d_delete(dn);
1099                                 goto done;
1100                         }
1101                         dn = splice_dentry(dn, in, &have_lease, true);
1102                         if (IS_ERR(dn)) {
1103                                 err = PTR_ERR(dn);
1104                                 goto done;
1105                         }
1106                         req->r_dentry = dn;  /* may have spliced */
1107                         ihold(in);
1108                 } else if (ceph_ino(in) == vino.ino &&
1109                            ceph_snap(in) == vino.snap) {
1110                         ihold(in);
1111                 } else {
1112                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1113                              dn, in, ceph_ino(in), ceph_snap(in),
1114                              vino.ino, vino.snap);
1115                         have_lease = false;
1116                         in = NULL;
1117                 }
1118
1119                 if (have_lease)
1120                         update_dentry_lease(dn, rinfo->dlease, session,
1121                                             req->r_request_started);
1122                 dout(" final dn %p\n", dn);
1123                 i++;
1124         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1125                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1126                 struct dentry *dn = req->r_dentry;
1127
1128                 /* fill out a snapdir LOOKUPSNAP dentry */
1129                 BUG_ON(!dn);
1130                 BUG_ON(!req->r_locked_dir);
1131                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1132                 ininfo = rinfo->targeti.in;
1133                 vino.ino = le64_to_cpu(ininfo->ino);
1134                 vino.snap = le64_to_cpu(ininfo->snapid);
1135                 in = ceph_get_inode(sb, vino);
1136                 if (IS_ERR(in)) {
1137                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1138                                vino.ino, vino.snap);
1139                         err = PTR_ERR(in);
1140                         d_delete(dn);
1141                         goto done;
1142                 }
1143                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1144                 dn = splice_dentry(dn, in, NULL, true);
1145                 if (IS_ERR(dn)) {
1146                         err = PTR_ERR(dn);
1147                         goto done;
1148                 }
1149                 req->r_dentry = dn;  /* may have spliced */
1150                 ihold(in);
1151                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1152         }
1153
1154         if (rinfo->head->is_target) {
1155                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1156                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1157
1158                 if (in == NULL || ceph_ino(in) != vino.ino ||
1159                     ceph_snap(in) != vino.snap) {
1160                         in = ceph_get_inode(sb, vino);
1161                         if (IS_ERR(in)) {
1162                                 err = PTR_ERR(in);
1163                                 goto done;
1164                         }
1165                 }
1166                 req->r_target_inode = in;
1167
1168                 err = fill_inode(in,
1169                                  &rinfo->targeti, NULL,
1170                                  session, req->r_request_started,
1171                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1172                                  req->r_fmode : -1,
1173                                  &req->r_caps_reservation);
1174                 if (err < 0) {
1175                         pr_err("fill_inode badness %p %llx.%llx\n",
1176                                in, ceph_vinop(in));
1177                         goto done;
1178                 }
1179         }
1180
1181 done:
1182         dout("fill_trace done err=%d\n", err);
1183         return err;
1184 }
1185
1186 /*
1187  * Prepopulate our cache with readdir results, leases, etc.
1188  */
1189 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1190                              struct ceph_mds_session *session)
1191 {
1192         struct dentry *parent = req->r_dentry;
1193         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1194         struct qstr dname;
1195         struct dentry *dn;
1196         struct inode *in;
1197         int err = 0, i;
1198         struct inode *snapdir = NULL;
1199         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1200         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1201         struct ceph_dentry_info *di;
1202
1203         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1204                 snapdir = ceph_get_snapdir(parent->d_inode);
1205                 parent = d_find_alias(snapdir);
1206                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1207                      rinfo->dir_nr, parent);
1208         } else {
1209                 dout("readdir_prepopulate %d items under dn %p\n",
1210                      rinfo->dir_nr, parent);
1211                 if (rinfo->dir_dir)
1212                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1213         }
1214
1215         for (i = 0; i < rinfo->dir_nr; i++) {
1216                 struct ceph_vino vino;
1217
1218                 dname.name = rinfo->dir_dname[i];
1219                 dname.len = rinfo->dir_dname_len[i];
1220                 dname.hash = full_name_hash(dname.name, dname.len);
1221
1222                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1223                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1224
1225 retry_lookup:
1226                 dn = d_lookup(parent, &dname);
1227                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1228                      parent, dname.len, dname.name, dn);
1229
1230                 if (!dn) {
1231                         dn = d_alloc(parent, &dname);
1232                         dout("d_alloc %p '%.*s' = %p\n", parent,
1233                              dname.len, dname.name, dn);
1234                         if (dn == NULL) {
1235                                 dout("d_alloc badness\n");
1236                                 err = -ENOMEM;
1237                                 goto out;
1238                         }
1239                         err = ceph_init_dentry(dn);
1240                         if (err < 0) {
1241                                 dput(dn);
1242                                 goto out;
1243                         }
1244                 } else if (dn->d_inode &&
1245                            (ceph_ino(dn->d_inode) != vino.ino ||
1246                             ceph_snap(dn->d_inode) != vino.snap)) {
1247                         dout(" dn %p points to wrong inode %p\n",
1248                              dn, dn->d_inode);
1249                         d_delete(dn);
1250                         dput(dn);
1251                         goto retry_lookup;
1252                 } else {
1253                         /* reorder parent's d_subdirs */
1254                         spin_lock(&parent->d_lock);
1255                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1256                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1257                         spin_unlock(&dn->d_lock);
1258                         spin_unlock(&parent->d_lock);
1259                 }
1260
1261                 di = dn->d_fsdata;
1262                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1263
1264                 /* inode */
1265                 if (dn->d_inode) {
1266                         in = dn->d_inode;
1267                 } else {
1268                         in = ceph_get_inode(parent->d_sb, vino);
1269                         if (IS_ERR(in)) {
1270                                 dout("new_inode badness\n");
1271                                 d_delete(dn);
1272                                 dput(dn);
1273                                 err = PTR_ERR(in);
1274                                 goto out;
1275                         }
1276                         dn = splice_dentry(dn, in, NULL, false);
1277                         if (IS_ERR(dn))
1278                                 dn = NULL;
1279                 }
1280
1281                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1282                                req->r_request_started, -1,
1283                                &req->r_caps_reservation) < 0) {
1284                         pr_err("fill_inode badness on %p\n", in);
1285                         goto next_item;
1286                 }
1287                 if (dn)
1288                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1289                                             req->r_session,
1290                                             req->r_request_started);
1291 next_item:
1292                 if (dn)
1293                         dput(dn);
1294         }
1295         req->r_did_prepopulate = true;
1296
1297 out:
1298         if (snapdir) {
1299                 iput(snapdir);
1300                 dput(parent);
1301         }
1302         dout("readdir_prepopulate done\n");
1303         return err;
1304 }
1305
1306 int ceph_inode_set_size(struct inode *inode, loff_t size)
1307 {
1308         struct ceph_inode_info *ci = ceph_inode(inode);
1309         int ret = 0;
1310
1311         spin_lock(&inode->i_lock);
1312         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1313         inode->i_size = size;
1314         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1315
1316         /* tell the MDS if we are approaching max_size */
1317         if ((size << 1) >= ci->i_max_size &&
1318             (ci->i_reported_size << 1) < ci->i_max_size)
1319                 ret = 1;
1320
1321         spin_unlock(&inode->i_lock);
1322         return ret;
1323 }
1324
1325 /*
1326  * Write back inode data in a worker thread.  (This can't be done
1327  * in the message handler context.)
1328  */
1329 void ceph_queue_writeback(struct inode *inode)
1330 {
1331         ihold(inode);
1332         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1333                        &ceph_inode(inode)->i_wb_work)) {
1334                 dout("ceph_queue_writeback %p\n", inode);
1335         } else {
1336                 dout("ceph_queue_writeback %p failed\n", inode);
1337                 iput(inode);
1338         }
1339 }
1340
1341 static void ceph_writeback_work(struct work_struct *work)
1342 {
1343         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1344                                                   i_wb_work);
1345         struct inode *inode = &ci->vfs_inode;
1346
1347         dout("writeback %p\n", inode);
1348         filemap_fdatawrite(&inode->i_data);
1349         iput(inode);
1350 }
1351
1352 /*
1353  * queue an async invalidation
1354  */
1355 void ceph_queue_invalidate(struct inode *inode)
1356 {
1357         ihold(inode);
1358         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1359                        &ceph_inode(inode)->i_pg_inv_work)) {
1360                 dout("ceph_queue_invalidate %p\n", inode);
1361         } else {
1362                 dout("ceph_queue_invalidate %p failed\n", inode);
1363                 iput(inode);
1364         }
1365 }
1366
1367 /*
1368  * Invalidate inode pages in a worker thread.  (This can't be done
1369  * in the message handler context.)
1370  */
1371 static void ceph_invalidate_work(struct work_struct *work)
1372 {
1373         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1374                                                   i_pg_inv_work);
1375         struct inode *inode = &ci->vfs_inode;
1376         u32 orig_gen;
1377         int check = 0;
1378
1379         spin_lock(&inode->i_lock);
1380         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1381              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1382         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1383                 /* nevermind! */
1384                 spin_unlock(&inode->i_lock);
1385                 goto out;
1386         }
1387         orig_gen = ci->i_rdcache_gen;
1388         spin_unlock(&inode->i_lock);
1389
1390         truncate_inode_pages(&inode->i_data, 0);
1391
1392         spin_lock(&inode->i_lock);
1393         if (orig_gen == ci->i_rdcache_gen &&
1394             orig_gen == ci->i_rdcache_revoking) {
1395                 dout("invalidate_pages %p gen %d successful\n", inode,
1396                      ci->i_rdcache_gen);
1397                 ci->i_rdcache_revoking--;
1398                 check = 1;
1399         } else {
1400                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1401                      inode, orig_gen, ci->i_rdcache_gen,
1402                      ci->i_rdcache_revoking);
1403         }
1404         spin_unlock(&inode->i_lock);
1405
1406         if (check)
1407                 ceph_check_caps(ci, 0, NULL);
1408 out:
1409         iput(inode);
1410 }
1411
1412
1413 /*
1414  * called by trunc_wq; take i_mutex ourselves
1415  *
1416  * We also truncate in a separate thread as well.
1417  */
1418 static void ceph_vmtruncate_work(struct work_struct *work)
1419 {
1420         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1421                                                   i_vmtruncate_work);
1422         struct inode *inode = &ci->vfs_inode;
1423
1424         dout("vmtruncate_work %p\n", inode);
1425         mutex_lock(&inode->i_mutex);
1426         __ceph_do_pending_vmtruncate(inode);
1427         mutex_unlock(&inode->i_mutex);
1428         iput(inode);
1429 }
1430
1431 /*
1432  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1433  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1434  */
1435 void ceph_queue_vmtruncate(struct inode *inode)
1436 {
1437         struct ceph_inode_info *ci = ceph_inode(inode);
1438
1439         ihold(inode);
1440         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1441                        &ci->i_vmtruncate_work)) {
1442                 dout("ceph_queue_vmtruncate %p\n", inode);
1443         } else {
1444                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1445                      inode, ci->i_truncate_pending);
1446                 iput(inode);
1447         }
1448 }
1449
1450 /*
1451  * called with i_mutex held.
1452  *
1453  * Make sure any pending truncation is applied before doing anything
1454  * that may depend on it.
1455  */
1456 void __ceph_do_pending_vmtruncate(struct inode *inode)
1457 {
1458         struct ceph_inode_info *ci = ceph_inode(inode);
1459         u64 to;
1460         int wrbuffer_refs, wake = 0;
1461
1462 retry:
1463         spin_lock(&inode->i_lock);
1464         if (ci->i_truncate_pending == 0) {
1465                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1466                 spin_unlock(&inode->i_lock);
1467                 return;
1468         }
1469
1470         /*
1471          * make sure any dirty snapped pages are flushed before we
1472          * possibly truncate them.. so write AND block!
1473          */
1474         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1475                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1476                      inode);
1477                 spin_unlock(&inode->i_lock);
1478                 filemap_write_and_wait_range(&inode->i_data, 0,
1479                                              inode->i_sb->s_maxbytes);
1480                 goto retry;
1481         }
1482
1483         to = ci->i_truncate_size;
1484         wrbuffer_refs = ci->i_wrbuffer_ref;
1485         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1486              ci->i_truncate_pending, to);
1487         spin_unlock(&inode->i_lock);
1488
1489         truncate_inode_pages(inode->i_mapping, to);
1490
1491         spin_lock(&inode->i_lock);
1492         ci->i_truncate_pending--;
1493         if (ci->i_truncate_pending == 0)
1494                 wake = 1;
1495         spin_unlock(&inode->i_lock);
1496
1497         if (wrbuffer_refs == 0)
1498                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1499         if (wake)
1500                 wake_up_all(&ci->i_cap_wq);
1501 }
1502
1503
1504 /*
1505  * symlinks
1506  */
1507 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1508 {
1509         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1510         nd_set_link(nd, ci->i_symlink);
1511         return NULL;
1512 }
1513
1514 static const struct inode_operations ceph_symlink_iops = {
1515         .readlink = generic_readlink,
1516         .follow_link = ceph_sym_follow_link,
1517 };
1518
1519 /*
1520  * setattr
1521  */
1522 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1523 {
1524         struct inode *inode = dentry->d_inode;
1525         struct ceph_inode_info *ci = ceph_inode(inode);
1526         struct inode *parent_inode;
1527         const unsigned int ia_valid = attr->ia_valid;
1528         struct ceph_mds_request *req;
1529         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1530         int issued;
1531         int release = 0, dirtied = 0;
1532         int mask = 0;
1533         int err = 0;
1534         int inode_dirty_flags = 0;
1535
1536         if (ceph_snap(inode) != CEPH_NOSNAP)
1537                 return -EROFS;
1538
1539         __ceph_do_pending_vmtruncate(inode);
1540
1541         err = inode_change_ok(inode, attr);
1542         if (err != 0)
1543                 return err;
1544
1545         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1546                                        USE_AUTH_MDS);
1547         if (IS_ERR(req))
1548                 return PTR_ERR(req);
1549
1550         spin_lock(&inode->i_lock);
1551         issued = __ceph_caps_issued(ci, NULL);
1552         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1553
1554         if (ia_valid & ATTR_UID) {
1555                 dout("setattr %p uid %d -> %d\n", inode,
1556                      inode->i_uid, attr->ia_uid);
1557                 if (issued & CEPH_CAP_AUTH_EXCL) {
1558                         inode->i_uid = attr->ia_uid;
1559                         dirtied |= CEPH_CAP_AUTH_EXCL;
1560                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1561                            attr->ia_uid != inode->i_uid) {
1562                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1563                         mask |= CEPH_SETATTR_UID;
1564                         release |= CEPH_CAP_AUTH_SHARED;
1565                 }
1566         }
1567         if (ia_valid & ATTR_GID) {
1568                 dout("setattr %p gid %d -> %d\n", inode,
1569                      inode->i_gid, attr->ia_gid);
1570                 if (issued & CEPH_CAP_AUTH_EXCL) {
1571                         inode->i_gid = attr->ia_gid;
1572                         dirtied |= CEPH_CAP_AUTH_EXCL;
1573                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1574                            attr->ia_gid != inode->i_gid) {
1575                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1576                         mask |= CEPH_SETATTR_GID;
1577                         release |= CEPH_CAP_AUTH_SHARED;
1578                 }
1579         }
1580         if (ia_valid & ATTR_MODE) {
1581                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1582                      attr->ia_mode);
1583                 if (issued & CEPH_CAP_AUTH_EXCL) {
1584                         inode->i_mode = attr->ia_mode;
1585                         dirtied |= CEPH_CAP_AUTH_EXCL;
1586                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1587                            attr->ia_mode != inode->i_mode) {
1588                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1589                         mask |= CEPH_SETATTR_MODE;
1590                         release |= CEPH_CAP_AUTH_SHARED;
1591                 }
1592         }
1593
1594         if (ia_valid & ATTR_ATIME) {
1595                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1596                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1597                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1598                 if (issued & CEPH_CAP_FILE_EXCL) {
1599                         ci->i_time_warp_seq++;
1600                         inode->i_atime = attr->ia_atime;
1601                         dirtied |= CEPH_CAP_FILE_EXCL;
1602                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1603                            timespec_compare(&inode->i_atime,
1604                                             &attr->ia_atime) < 0) {
1605                         inode->i_atime = attr->ia_atime;
1606                         dirtied |= CEPH_CAP_FILE_WR;
1607                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1608                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1609                         ceph_encode_timespec(&req->r_args.setattr.atime,
1610                                              &attr->ia_atime);
1611                         mask |= CEPH_SETATTR_ATIME;
1612                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1613                                 CEPH_CAP_FILE_WR;
1614                 }
1615         }
1616         if (ia_valid & ATTR_MTIME) {
1617                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1618                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1619                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1620                 if (issued & CEPH_CAP_FILE_EXCL) {
1621                         ci->i_time_warp_seq++;
1622                         inode->i_mtime = attr->ia_mtime;
1623                         dirtied |= CEPH_CAP_FILE_EXCL;
1624                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1625                            timespec_compare(&inode->i_mtime,
1626                                             &attr->ia_mtime) < 0) {
1627                         inode->i_mtime = attr->ia_mtime;
1628                         dirtied |= CEPH_CAP_FILE_WR;
1629                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1630                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1631                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1632                                              &attr->ia_mtime);
1633                         mask |= CEPH_SETATTR_MTIME;
1634                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1635                                 CEPH_CAP_FILE_WR;
1636                 }
1637         }
1638         if (ia_valid & ATTR_SIZE) {
1639                 dout("setattr %p size %lld -> %lld\n", inode,
1640                      inode->i_size, attr->ia_size);
1641                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1642                         err = -EINVAL;
1643                         goto out;
1644                 }
1645                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1646                     attr->ia_size > inode->i_size) {
1647                         inode->i_size = attr->ia_size;
1648                         inode->i_blocks =
1649                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1650                         inode->i_ctime = attr->ia_ctime;
1651                         ci->i_reported_size = attr->ia_size;
1652                         dirtied |= CEPH_CAP_FILE_EXCL;
1653                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1654                            attr->ia_size != inode->i_size) {
1655                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1656                         req->r_args.setattr.old_size =
1657                                 cpu_to_le64(inode->i_size);
1658                         mask |= CEPH_SETATTR_SIZE;
1659                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1660                                 CEPH_CAP_FILE_WR;
1661                 }
1662         }
1663
1664         /* these do nothing */
1665         if (ia_valid & ATTR_CTIME) {
1666                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1667                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1668                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1669                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1670                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1671                      only ? "ctime only" : "ignored");
1672                 inode->i_ctime = attr->ia_ctime;
1673                 if (only) {
1674                         /*
1675                          * if kernel wants to dirty ctime but nothing else,
1676                          * we need to choose a cap to dirty under, or do
1677                          * a almost-no-op setattr
1678                          */
1679                         if (issued & CEPH_CAP_AUTH_EXCL)
1680                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1681                         else if (issued & CEPH_CAP_FILE_EXCL)
1682                                 dirtied |= CEPH_CAP_FILE_EXCL;
1683                         else if (issued & CEPH_CAP_XATTR_EXCL)
1684                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1685                         else
1686                                 mask |= CEPH_SETATTR_CTIME;
1687                 }
1688         }
1689         if (ia_valid & ATTR_FILE)
1690                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1691
1692         if (dirtied) {
1693                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1694                 inode->i_ctime = CURRENT_TIME;
1695         }
1696
1697         release &= issued;
1698         spin_unlock(&inode->i_lock);
1699
1700         if (inode_dirty_flags)
1701                 __mark_inode_dirty(inode, inode_dirty_flags);
1702
1703         if (mask) {
1704                 req->r_inode = inode;
1705                 ihold(inode);
1706                 req->r_inode_drop = release;
1707                 req->r_args.setattr.mask = cpu_to_le32(mask);
1708                 req->r_num_caps = 1;
1709                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1710                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1711                 iput(parent_inode);
1712         }
1713         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1714              ceph_cap_string(dirtied), mask);
1715
1716         ceph_mdsc_put_request(req);
1717         __ceph_do_pending_vmtruncate(inode);
1718         return err;
1719 out:
1720         spin_unlock(&inode->i_lock);
1721         ceph_mdsc_put_request(req);
1722         return err;
1723 }
1724
1725 /*
1726  * Verify that we have a lease on the given mask.  If not,
1727  * do a getattr against an mds.
1728  */
1729 int ceph_do_getattr(struct inode *inode, int mask)
1730 {
1731         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1732         struct ceph_mds_client *mdsc = fsc->mdsc;
1733         struct ceph_mds_request *req;
1734         int err;
1735
1736         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1737                 dout("do_getattr inode %p SNAPDIR\n", inode);
1738                 return 0;
1739         }
1740
1741         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1742         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1743                 return 0;
1744
1745         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1746         if (IS_ERR(req))
1747                 return PTR_ERR(req);
1748         req->r_inode = inode;
1749         ihold(inode);
1750         req->r_num_caps = 1;
1751         req->r_args.getattr.mask = cpu_to_le32(mask);
1752         err = ceph_mdsc_do_request(mdsc, NULL, req);
1753         ceph_mdsc_put_request(req);
1754         dout("do_getattr result=%d\n", err);
1755         return err;
1756 }
1757
1758
1759 /*
1760  * Check inode permissions.  We verify we have a valid value for
1761  * the AUTH cap, then call the generic handler.
1762  */
1763 int ceph_permission(struct inode *inode, int mask)
1764 {
1765         int err;
1766
1767         if (mask & MAY_NOT_BLOCK)
1768                 return -ECHILD;
1769
1770         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1771
1772         if (!err)
1773                 err = generic_permission(inode, mask);
1774         return err;
1775 }
1776
1777 /*
1778  * Get all attributes.  Hopefully somedata we'll have a statlite()
1779  * and can limit the fields we require to be accurate.
1780  */
1781 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1782                  struct kstat *stat)
1783 {
1784         struct inode *inode = dentry->d_inode;
1785         struct ceph_inode_info *ci = ceph_inode(inode);
1786         int err;
1787
1788         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1789         if (!err) {
1790                 generic_fillattr(inode, stat);
1791                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1792                 if (ceph_snap(inode) != CEPH_NOSNAP)
1793                         stat->dev = ceph_snap(inode);
1794                 else
1795                         stat->dev = 0;
1796                 if (S_ISDIR(inode->i_mode)) {
1797                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1798                                                 RBYTES))
1799                                 stat->size = ci->i_rbytes;
1800                         else
1801                                 stat->size = ci->i_files + ci->i_subdirs;
1802                         stat->blocks = 0;
1803                         stat->blksize = 65536;
1804                 }
1805         }
1806         return err;
1807 }