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