ceph: do not set I_COMPLETE
[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 #include <linux/pagevec.h>
13
14 #include "super.h"
15 #include "mds_client.h"
16 #include <linux/ceph/decode.h>
17
18 /*
19  * Ceph inode operations
20  *
21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
22  * setattr, etc.), xattr helpers, and helpers for assimilating
23  * metadata returned by the MDS into our cache.
24  *
25  * Also define helpers for doing asynchronous writeback, invalidation,
26  * and truncation for the benefit of those who can't afford to block
27  * (typically because they are in the message handler path).
28  */
29
30 static const struct inode_operations ceph_symlink_iops;
31
32 static void ceph_invalidate_work(struct work_struct *work);
33 static void ceph_writeback_work(struct work_struct *work);
34 static void ceph_vmtruncate_work(struct work_struct *work);
35
36 /*
37  * find or create an inode, given the ceph ino number
38  */
39 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
40 {
41         struct inode *inode;
42         ino_t t = ceph_vino_to_ino(vino);
43
44         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
45         if (inode == NULL)
46                 return ERR_PTR(-ENOMEM);
47         if (inode->i_state & I_NEW) {
48                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
49                      inode, ceph_vinop(inode), (u64)inode->i_ino);
50                 unlock_new_inode(inode);
51         }
52
53         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
54              vino.snap, inode);
55         return inode;
56 }
57
58 /*
59  * get/constuct snapdir inode for a given directory
60  */
61 struct inode *ceph_get_snapdir(struct inode *parent)
62 {
63         struct ceph_vino vino = {
64                 .ino = ceph_ino(parent),
65                 .snap = CEPH_SNAPDIR,
66         };
67         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
68         struct ceph_inode_info *ci = ceph_inode(inode);
69
70         BUG_ON(!S_ISDIR(parent->i_mode));
71         if (IS_ERR(inode))
72                 return inode;
73         inode->i_mode = parent->i_mode;
74         inode->i_uid = parent->i_uid;
75         inode->i_gid = parent->i_gid;
76         inode->i_op = &ceph_dir_iops;
77         inode->i_fop = &ceph_dir_fops;
78         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
79         ci->i_rbytes = 0;
80         return inode;
81 }
82
83 const struct inode_operations ceph_file_iops = {
84         .permission = ceph_permission,
85         .setattr = ceph_setattr,
86         .getattr = ceph_getattr,
87         .setxattr = ceph_setxattr,
88         .getxattr = ceph_getxattr,
89         .listxattr = ceph_listxattr,
90         .removexattr = ceph_removexattr,
91 };
92
93
94 /*
95  * We use a 'frag tree' to keep track of the MDS's directory fragments
96  * for a given inode (usually there is just a single fragment).  We
97  * need to know when a child frag is delegated to a new MDS, or when
98  * it is flagged as replicated, so we can direct our requests
99  * accordingly.
100  */
101
102 /*
103  * find/create a frag in the tree
104  */
105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
106                                                     u32 f)
107 {
108         struct rb_node **p;
109         struct rb_node *parent = NULL;
110         struct ceph_inode_frag *frag;
111         int c;
112
113         p = &ci->i_fragtree.rb_node;
114         while (*p) {
115                 parent = *p;
116                 frag = rb_entry(parent, struct ceph_inode_frag, node);
117                 c = ceph_frag_compare(f, frag->frag);
118                 if (c < 0)
119                         p = &(*p)->rb_left;
120                 else if (c > 0)
121                         p = &(*p)->rb_right;
122                 else
123                         return frag;
124         }
125
126         frag = kmalloc(sizeof(*frag), GFP_NOFS);
127         if (!frag) {
128                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
129                        "frag %x\n", &ci->vfs_inode,
130                        ceph_vinop(&ci->vfs_inode), f);
131                 return ERR_PTR(-ENOMEM);
132         }
133         frag->frag = f;
134         frag->split_by = 0;
135         frag->mds = -1;
136         frag->ndist = 0;
137
138         rb_link_node(&frag->node, parent, p);
139         rb_insert_color(&frag->node, &ci->i_fragtree);
140
141         dout("get_or_create_frag added %llx.%llx frag %x\n",
142              ceph_vinop(&ci->vfs_inode), f);
143         return frag;
144 }
145
146 /*
147  * find a specific frag @f
148  */
149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
150 {
151         struct rb_node *n = ci->i_fragtree.rb_node;
152
153         while (n) {
154                 struct ceph_inode_frag *frag =
155                         rb_entry(n, struct ceph_inode_frag, node);
156                 int c = ceph_frag_compare(f, frag->frag);
157                 if (c < 0)
158                         n = n->rb_left;
159                 else if (c > 0)
160                         n = n->rb_right;
161                 else
162                         return frag;
163         }
164         return NULL;
165 }
166
167 /*
168  * Choose frag containing the given value @v.  If @pfrag is
169  * specified, copy the frag delegation info to the caller if
170  * it is present.
171  */
172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
173                      struct ceph_inode_frag *pfrag,
174                      int *found)
175 {
176         u32 t = ceph_frag_make(0, 0);
177         struct ceph_inode_frag *frag;
178         unsigned nway, i;
179         u32 n;
180
181         if (found)
182                 *found = 0;
183
184         mutex_lock(&ci->i_fragtree_mutex);
185         while (1) {
186                 WARN_ON(!ceph_frag_contains_value(t, v));
187                 frag = __ceph_find_frag(ci, t);
188                 if (!frag)
189                         break; /* t is a leaf */
190                 if (frag->split_by == 0) {
191                         if (pfrag)
192                                 memcpy(pfrag, frag, sizeof(*pfrag));
193                         if (found)
194                                 *found = 1;
195                         break;
196                 }
197
198                 /* choose child */
199                 nway = 1 << frag->split_by;
200                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
201                      frag->split_by, nway);
202                 for (i = 0; i < nway; i++) {
203                         n = ceph_frag_make_child(t, frag->split_by, i);
204                         if (ceph_frag_contains_value(n, v)) {
205                                 t = n;
206                                 break;
207                         }
208                 }
209                 BUG_ON(i == nway);
210         }
211         dout("choose_frag(%x) = %x\n", v, t);
212
213         mutex_unlock(&ci->i_fragtree_mutex);
214         return t;
215 }
216
217 /*
218  * Process dirfrag (delegation) info from the mds.  Include leaf
219  * fragment in tree ONLY if ndist > 0.  Otherwise, only
220  * branches/splits are included in i_fragtree)
221  */
222 static int ceph_fill_dirfrag(struct inode *inode,
223                              struct ceph_mds_reply_dirfrag *dirinfo)
224 {
225         struct ceph_inode_info *ci = ceph_inode(inode);
226         struct ceph_inode_frag *frag;
227         u32 id = le32_to_cpu(dirinfo->frag);
228         int mds = le32_to_cpu(dirinfo->auth);
229         int ndist = le32_to_cpu(dirinfo->ndist);
230         int i;
231         int err = 0;
232
233         mutex_lock(&ci->i_fragtree_mutex);
234         if (ndist == 0) {
235                 /* no delegation info needed. */
236                 frag = __ceph_find_frag(ci, id);
237                 if (!frag)
238                         goto out;
239                 if (frag->split_by == 0) {
240                         /* tree leaf, remove */
241                         dout("fill_dirfrag removed %llx.%llx frag %x"
242                              " (no ref)\n", ceph_vinop(inode), id);
243                         rb_erase(&frag->node, &ci->i_fragtree);
244                         kfree(frag);
245                 } else {
246                         /* tree branch, keep and clear */
247                         dout("fill_dirfrag cleared %llx.%llx frag %x"
248                              " referral\n", ceph_vinop(inode), id);
249                         frag->mds = -1;
250                         frag->ndist = 0;
251                 }
252                 goto out;
253         }
254
255
256         /* find/add this frag to store mds delegation info */
257         frag = __get_or_create_frag(ci, id);
258         if (IS_ERR(frag)) {
259                 /* this is not the end of the world; we can continue
260                    with bad/inaccurate delegation info */
261                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
262                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
263                 err = -ENOMEM;
264                 goto out;
265         }
266
267         frag->mds = mds;
268         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
269         for (i = 0; i < frag->ndist; i++)
270                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
271         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
272              ceph_vinop(inode), frag->frag, frag->ndist);
273
274 out:
275         mutex_unlock(&ci->i_fragtree_mutex);
276         return err;
277 }
278
279
280 /*
281  * initialize a newly allocated inode.
282  */
283 struct inode *ceph_alloc_inode(struct super_block *sb)
284 {
285         struct ceph_inode_info *ci;
286         int i;
287
288         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
289         if (!ci)
290                 return NULL;
291
292         dout("alloc_inode %p\n", &ci->vfs_inode);
293
294         ci->i_version = 0;
295         ci->i_time_warp_seq = 0;
296         ci->i_ceph_flags = 0;
297         ci->i_release_count = 0;
298         ci->i_symlink = NULL;
299
300         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
301
302         ci->i_fragtree = RB_ROOT;
303         mutex_init(&ci->i_fragtree_mutex);
304
305         ci->i_xattrs.blob = NULL;
306         ci->i_xattrs.prealloc_blob = NULL;
307         ci->i_xattrs.dirty = false;
308         ci->i_xattrs.index = RB_ROOT;
309         ci->i_xattrs.count = 0;
310         ci->i_xattrs.names_size = 0;
311         ci->i_xattrs.vals_size = 0;
312         ci->i_xattrs.version = 0;
313         ci->i_xattrs.index_version = 0;
314
315         ci->i_caps = RB_ROOT;
316         ci->i_auth_cap = NULL;
317         ci->i_dirty_caps = 0;
318         ci->i_flushing_caps = 0;
319         INIT_LIST_HEAD(&ci->i_dirty_item);
320         INIT_LIST_HEAD(&ci->i_flushing_item);
321         ci->i_cap_flush_seq = 0;
322         ci->i_cap_flush_last_tid = 0;
323         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
324         init_waitqueue_head(&ci->i_cap_wq);
325         ci->i_hold_caps_min = 0;
326         ci->i_hold_caps_max = 0;
327         INIT_LIST_HEAD(&ci->i_cap_delay_list);
328         ci->i_cap_exporting_mds = 0;
329         ci->i_cap_exporting_mseq = 0;
330         ci->i_cap_exporting_issued = 0;
331         INIT_LIST_HEAD(&ci->i_cap_snaps);
332         ci->i_head_snapc = NULL;
333         ci->i_snap_caps = 0;
334
335         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
336                 ci->i_nr_by_mode[i] = 0;
337
338         ci->i_truncate_seq = 0;
339         ci->i_truncate_size = 0;
340         ci->i_truncate_pending = 0;
341
342         ci->i_max_size = 0;
343         ci->i_reported_size = 0;
344         ci->i_wanted_max_size = 0;
345         ci->i_requested_max_size = 0;
346
347         ci->i_pin_ref = 0;
348         ci->i_rd_ref = 0;
349         ci->i_rdcache_ref = 0;
350         ci->i_wr_ref = 0;
351         ci->i_wrbuffer_ref = 0;
352         ci->i_wrbuffer_ref_head = 0;
353         ci->i_shared_gen = 0;
354         ci->i_rdcache_gen = 0;
355         ci->i_rdcache_revoking = 0;
356
357         INIT_LIST_HEAD(&ci->i_unsafe_writes);
358         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
359         spin_lock_init(&ci->i_unsafe_lock);
360
361         ci->i_snap_realm = NULL;
362         INIT_LIST_HEAD(&ci->i_snap_realm_item);
363         INIT_LIST_HEAD(&ci->i_snap_flush_item);
364
365         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
366         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
367
368         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
369
370         return &ci->vfs_inode;
371 }
372
373 static void ceph_i_callback(struct rcu_head *head)
374 {
375         struct inode *inode = container_of(head, struct inode, i_rcu);
376         struct ceph_inode_info *ci = ceph_inode(inode);
377
378         INIT_LIST_HEAD(&inode->i_dentry);
379         kmem_cache_free(ceph_inode_cachep, ci);
380 }
381
382 void ceph_destroy_inode(struct inode *inode)
383 {
384         struct ceph_inode_info *ci = ceph_inode(inode);
385         struct ceph_inode_frag *frag;
386         struct rb_node *n;
387
388         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
389
390         ceph_queue_caps_release(inode);
391
392         /*
393          * we may still have a snap_realm reference if there are stray
394          * caps in i_cap_exporting_issued or i_snap_caps.
395          */
396         if (ci->i_snap_realm) {
397                 struct ceph_mds_client *mdsc =
398                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
399                 struct ceph_snap_realm *realm = ci->i_snap_realm;
400
401                 dout(" dropping residual ref to snap realm %p\n", realm);
402                 spin_lock(&realm->inodes_with_caps_lock);
403                 list_del_init(&ci->i_snap_realm_item);
404                 spin_unlock(&realm->inodes_with_caps_lock);
405                 ceph_put_snap_realm(mdsc, realm);
406         }
407
408         kfree(ci->i_symlink);
409         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
410                 frag = rb_entry(n, struct ceph_inode_frag, node);
411                 rb_erase(n, &ci->i_fragtree);
412                 kfree(frag);
413         }
414
415         __ceph_destroy_xattrs(ci);
416         if (ci->i_xattrs.blob)
417                 ceph_buffer_put(ci->i_xattrs.blob);
418         if (ci->i_xattrs.prealloc_blob)
419                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
420
421         call_rcu(&inode->i_rcu, ceph_i_callback);
422 }
423
424
425 /*
426  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
427  * careful because either the client or MDS may have more up to date
428  * info, depending on which capabilities are held, and whether
429  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
430  * and size are monotonically increasing, except when utimes() or
431  * truncate() increments the corresponding _seq values.)
432  */
433 int ceph_fill_file_size(struct inode *inode, int issued,
434                         u32 truncate_seq, u64 truncate_size, u64 size)
435 {
436         struct ceph_inode_info *ci = ceph_inode(inode);
437         int queue_trunc = 0;
438
439         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
440             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
441                 dout("size %lld -> %llu\n", inode->i_size, size);
442                 inode->i_size = size;
443                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
444                 ci->i_reported_size = size;
445                 if (truncate_seq != ci->i_truncate_seq) {
446                         dout("truncate_seq %u -> %u\n",
447                              ci->i_truncate_seq, truncate_seq);
448                         ci->i_truncate_seq = truncate_seq;
449                         /*
450                          * If we hold relevant caps, or in the case where we're
451                          * not the only client referencing this file and we
452                          * don't hold those caps, then we need to check whether
453                          * the file is either opened or mmaped
454                          */
455                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
456                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
457                                        CEPH_CAP_FILE_EXCL|
458                                        CEPH_CAP_FILE_LAZYIO)) ||
459                             mapping_mapped(inode->i_mapping) ||
460                             __ceph_caps_file_wanted(ci)) {
461                                 ci->i_truncate_pending++;
462                                 queue_trunc = 1;
463                         }
464                 }
465         }
466         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
467             ci->i_truncate_size != truncate_size) {
468                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
469                      truncate_size);
470                 ci->i_truncate_size = truncate_size;
471         }
472         return queue_trunc;
473 }
474
475 void ceph_fill_file_time(struct inode *inode, int issued,
476                          u64 time_warp_seq, struct timespec *ctime,
477                          struct timespec *mtime, struct timespec *atime)
478 {
479         struct ceph_inode_info *ci = ceph_inode(inode);
480         int warn = 0;
481
482         if (issued & (CEPH_CAP_FILE_EXCL|
483                       CEPH_CAP_FILE_WR|
484                       CEPH_CAP_FILE_BUFFER|
485                       CEPH_CAP_AUTH_EXCL|
486                       CEPH_CAP_XATTR_EXCL)) {
487                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
488                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
489                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
490                              ctime->tv_sec, ctime->tv_nsec);
491                         inode->i_ctime = *ctime;
492                 }
493                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
494                         /* the MDS did a utimes() */
495                         dout("mtime %ld.%09ld -> %ld.%09ld "
496                              "tw %d -> %d\n",
497                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
498                              mtime->tv_sec, mtime->tv_nsec,
499                              ci->i_time_warp_seq, (int)time_warp_seq);
500
501                         inode->i_mtime = *mtime;
502                         inode->i_atime = *atime;
503                         ci->i_time_warp_seq = time_warp_seq;
504                 } else if (time_warp_seq == ci->i_time_warp_seq) {
505                         /* nobody did utimes(); take the max */
506                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
507                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
508                                      inode->i_mtime.tv_sec,
509                                      inode->i_mtime.tv_nsec,
510                                      mtime->tv_sec, mtime->tv_nsec);
511                                 inode->i_mtime = *mtime;
512                         }
513                         if (timespec_compare(atime, &inode->i_atime) > 0) {
514                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
515                                      inode->i_atime.tv_sec,
516                                      inode->i_atime.tv_nsec,
517                                      atime->tv_sec, atime->tv_nsec);
518                                 inode->i_atime = *atime;
519                         }
520                 } else if (issued & CEPH_CAP_FILE_EXCL) {
521                         /* we did a utimes(); ignore mds values */
522                 } else {
523                         warn = 1;
524                 }
525         } else {
526                 /* we have no write|excl caps; whatever the MDS says is true */
527                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
528                         inode->i_ctime = *ctime;
529                         inode->i_mtime = *mtime;
530                         inode->i_atime = *atime;
531                         ci->i_time_warp_seq = time_warp_seq;
532                 } else {
533                         warn = 1;
534                 }
535         }
536         if (warn) /* time_warp_seq shouldn't go backwards */
537                 dout("%p mds time_warp_seq %llu < %u\n",
538                      inode, time_warp_seq, ci->i_time_warp_seq);
539 }
540
541 /*
542  * Populate an inode based on info from mds.  May be called on new or
543  * existing inodes.
544  */
545 static int fill_inode(struct inode *inode,
546                       struct ceph_mds_reply_info_in *iinfo,
547                       struct ceph_mds_reply_dirfrag *dirinfo,
548                       struct ceph_mds_session *session,
549                       unsigned long ttl_from, int cap_fmode,
550                       struct ceph_cap_reservation *caps_reservation)
551 {
552         struct ceph_mds_reply_inode *info = iinfo->in;
553         struct ceph_inode_info *ci = ceph_inode(inode);
554         int i;
555         int issued, implemented;
556         struct timespec mtime, atime, ctime;
557         u32 nsplits;
558         struct ceph_buffer *xattr_blob = NULL;
559         int err = 0;
560         int queue_trunc = 0;
561
562         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
563              inode, ceph_vinop(inode), le64_to_cpu(info->version),
564              ci->i_version);
565
566         /*
567          * prealloc xattr data, if it looks like we'll need it.  only
568          * if len > 4 (meaning there are actually xattrs; the first 4
569          * bytes are the xattr count).
570          */
571         if (iinfo->xattr_len > 4) {
572                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
573                 if (!xattr_blob)
574                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
575                                iinfo->xattr_len);
576         }
577
578         spin_lock(&inode->i_lock);
579
580         /*
581          * provided version will be odd if inode value is projected,
582          * even if stable.  skip the update if we have newer stable
583          * info (ours>=theirs, e.g. due to racing mds replies), unless
584          * we are getting projected (unstable) info (in which case the
585          * version is odd, and we want ours>theirs).
586          *   us   them
587          *   2    2     skip
588          *   3    2     skip
589          *   3    3     update
590          */
591         if (le64_to_cpu(info->version) > 0 &&
592             (ci->i_version & ~1) >= le64_to_cpu(info->version))
593                 goto no_change;
594
595         issued = __ceph_caps_issued(ci, &implemented);
596         issued |= implemented | __ceph_caps_dirty(ci);
597
598         /* update inode */
599         ci->i_version = le64_to_cpu(info->version);
600         inode->i_version++;
601         inode->i_rdev = le32_to_cpu(info->rdev);
602
603         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
604                 inode->i_mode = le32_to_cpu(info->mode);
605                 inode->i_uid = le32_to_cpu(info->uid);
606                 inode->i_gid = le32_to_cpu(info->gid);
607                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
608                      inode->i_uid, inode->i_gid);
609         }
610
611         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
612                 inode->i_nlink = le32_to_cpu(info->nlink);
613
614         /* be careful with mtime, atime, size */
615         ceph_decode_timespec(&atime, &info->atime);
616         ceph_decode_timespec(&mtime, &info->mtime);
617         ceph_decode_timespec(&ctime, &info->ctime);
618         queue_trunc = ceph_fill_file_size(inode, issued,
619                                           le32_to_cpu(info->truncate_seq),
620                                           le64_to_cpu(info->truncate_size),
621                                           le64_to_cpu(info->size));
622         ceph_fill_file_time(inode, issued,
623                             le32_to_cpu(info->time_warp_seq),
624                             &ctime, &mtime, &atime);
625
626         /* only update max_size on auth cap */
627         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
628             ci->i_max_size != le64_to_cpu(info->max_size)) {
629                 dout("max_size %lld -> %llu\n", ci->i_max_size,
630                      le64_to_cpu(info->max_size));
631                 ci->i_max_size = le64_to_cpu(info->max_size);
632         }
633
634         ci->i_layout = info->layout;
635         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
636
637         /* xattrs */
638         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
639         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
640             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
641                 if (ci->i_xattrs.blob)
642                         ceph_buffer_put(ci->i_xattrs.blob);
643                 ci->i_xattrs.blob = xattr_blob;
644                 if (xattr_blob)
645                         memcpy(ci->i_xattrs.blob->vec.iov_base,
646                                iinfo->xattr_data, iinfo->xattr_len);
647                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
648                 xattr_blob = NULL;
649         }
650
651         inode->i_mapping->a_ops = &ceph_aops;
652         inode->i_mapping->backing_dev_info =
653                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
654
655         switch (inode->i_mode & S_IFMT) {
656         case S_IFIFO:
657         case S_IFBLK:
658         case S_IFCHR:
659         case S_IFSOCK:
660                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
661                 inode->i_op = &ceph_file_iops;
662                 break;
663         case S_IFREG:
664                 inode->i_op = &ceph_file_iops;
665                 inode->i_fop = &ceph_file_fops;
666                 break;
667         case S_IFLNK:
668                 inode->i_op = &ceph_symlink_iops;
669                 if (!ci->i_symlink) {
670                         int symlen = iinfo->symlink_len;
671                         char *sym;
672
673                         BUG_ON(symlen != inode->i_size);
674                         spin_unlock(&inode->i_lock);
675
676                         err = -ENOMEM;
677                         sym = kmalloc(symlen+1, GFP_NOFS);
678                         if (!sym)
679                                 goto out;
680                         memcpy(sym, iinfo->symlink, symlen);
681                         sym[symlen] = 0;
682
683                         spin_lock(&inode->i_lock);
684                         if (!ci->i_symlink)
685                                 ci->i_symlink = sym;
686                         else
687                                 kfree(sym); /* lost a race */
688                 }
689                 break;
690         case S_IFDIR:
691                 inode->i_op = &ceph_dir_iops;
692                 inode->i_fop = &ceph_dir_fops;
693
694                 ci->i_dir_layout = iinfo->dir_layout;
695
696                 ci->i_files = le64_to_cpu(info->files);
697                 ci->i_subdirs = le64_to_cpu(info->subdirs);
698                 ci->i_rbytes = le64_to_cpu(info->rbytes);
699                 ci->i_rfiles = le64_to_cpu(info->rfiles);
700                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
701                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
702
703                 /* set dir completion flag? */
704                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
705                     ceph_snap(inode) == CEPH_NOSNAP &&
706                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
707                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
708                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
709                         dout(" marking %p complete (empty)\n", inode);
710                         /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
711                         ci->i_max_offset = 2;
712                 }
713                 break;
714         default:
715                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
716                        ceph_vinop(inode), inode->i_mode);
717         }
718
719 no_change:
720         spin_unlock(&inode->i_lock);
721
722         /* queue truncate if we saw i_size decrease */
723         if (queue_trunc)
724                 ceph_queue_vmtruncate(inode);
725
726         /* populate frag tree */
727         /* FIXME: move me up, if/when version reflects fragtree changes */
728         nsplits = le32_to_cpu(info->fragtree.nsplits);
729         mutex_lock(&ci->i_fragtree_mutex);
730         for (i = 0; i < nsplits; i++) {
731                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
732                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
733
734                 if (IS_ERR(frag))
735                         continue;
736                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
737                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
738         }
739         mutex_unlock(&ci->i_fragtree_mutex);
740
741         /* were we issued a capability? */
742         if (info->cap.caps) {
743                 if (ceph_snap(inode) == CEPH_NOSNAP) {
744                         ceph_add_cap(inode, session,
745                                      le64_to_cpu(info->cap.cap_id),
746                                      cap_fmode,
747                                      le32_to_cpu(info->cap.caps),
748                                      le32_to_cpu(info->cap.wanted),
749                                      le32_to_cpu(info->cap.seq),
750                                      le32_to_cpu(info->cap.mseq),
751                                      le64_to_cpu(info->cap.realm),
752                                      info->cap.flags,
753                                      caps_reservation);
754                 } else {
755                         spin_lock(&inode->i_lock);
756                         dout(" %p got snap_caps %s\n", inode,
757                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
758                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
759                         if (cap_fmode >= 0)
760                                 __ceph_get_fmode(ci, cap_fmode);
761                         spin_unlock(&inode->i_lock);
762                 }
763         } else if (cap_fmode >= 0) {
764                 pr_warning("mds issued no caps on %llx.%llx\n",
765                            ceph_vinop(inode));
766                 __ceph_get_fmode(ci, cap_fmode);
767         }
768
769         /* update delegation info? */
770         if (dirinfo)
771                 ceph_fill_dirfrag(inode, dirinfo);
772
773         err = 0;
774
775 out:
776         if (xattr_blob)
777                 ceph_buffer_put(xattr_blob);
778         return err;
779 }
780
781 /*
782  * caller should hold session s_mutex.
783  */
784 static void update_dentry_lease(struct dentry *dentry,
785                                 struct ceph_mds_reply_lease *lease,
786                                 struct ceph_mds_session *session,
787                                 unsigned long from_time)
788 {
789         struct ceph_dentry_info *di = ceph_dentry(dentry);
790         long unsigned duration = le32_to_cpu(lease->duration_ms);
791         long unsigned ttl = from_time + (duration * HZ) / 1000;
792         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
793         struct inode *dir;
794
795         /* only track leases on regular dentries */
796         if (dentry->d_op != &ceph_dentry_ops)
797                 return;
798
799         spin_lock(&dentry->d_lock);
800         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
801              dentry, le16_to_cpu(lease->mask), duration, ttl);
802
803         /* make lease_rdcache_gen match directory */
804         dir = dentry->d_parent->d_inode;
805         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
806
807         if (lease->mask == 0)
808                 goto out_unlock;
809
810         if (di->lease_gen == session->s_cap_gen &&
811             time_before(ttl, dentry->d_time))
812                 goto out_unlock;  /* we already have a newer lease. */
813
814         if (di->lease_session && di->lease_session != session)
815                 goto out_unlock;
816
817         ceph_dentry_lru_touch(dentry);
818
819         if (!di->lease_session)
820                 di->lease_session = ceph_get_mds_session(session);
821         di->lease_gen = session->s_cap_gen;
822         di->lease_seq = le32_to_cpu(lease->seq);
823         di->lease_renew_after = half_ttl;
824         di->lease_renew_from = 0;
825         dentry->d_time = ttl;
826 out_unlock:
827         spin_unlock(&dentry->d_lock);
828         return;
829 }
830
831 /*
832  * Set dentry's directory position based on the current dir's max, and
833  * order it in d_subdirs, so that dcache_readdir behaves.
834  */
835 static void ceph_set_dentry_offset(struct dentry *dn)
836 {
837         struct dentry *dir = dn->d_parent;
838         struct inode *inode = dn->d_parent->d_inode;
839         struct ceph_dentry_info *di;
840
841         BUG_ON(!inode);
842
843         di = ceph_dentry(dn);
844
845         spin_lock(&inode->i_lock);
846         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
847                 spin_unlock(&inode->i_lock);
848                 return;
849         }
850         di->offset = ceph_inode(inode)->i_max_offset++;
851         spin_unlock(&inode->i_lock);
852
853         spin_lock(&dir->d_lock);
854         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
855         list_move(&dn->d_u.d_child, &dir->d_subdirs);
856         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
857              dn->d_u.d_child.prev, dn->d_u.d_child.next);
858         spin_unlock(&dn->d_lock);
859         spin_unlock(&dir->d_lock);
860 }
861
862 /*
863  * splice a dentry to an inode.
864  * caller must hold directory i_mutex for this to be safe.
865  *
866  * we will only rehash the resulting dentry if @prehash is
867  * true; @prehash will be set to false (for the benefit of
868  * the caller) if we fail.
869  */
870 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
871                                     bool *prehash, bool set_offset)
872 {
873         struct dentry *realdn;
874
875         BUG_ON(dn->d_inode);
876
877         /* dn must be unhashed */
878         if (!d_unhashed(dn))
879                 d_drop(dn);
880         realdn = d_materialise_unique(dn, in);
881         if (IS_ERR(realdn)) {
882                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
883                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
884                 if (prehash)
885                         *prehash = false; /* don't rehash on error */
886                 dn = realdn; /* note realdn contains the error */
887                 goto out;
888         } else if (realdn) {
889                 dout("dn %p (%d) spliced with %p (%d) "
890                      "inode %p ino %llx.%llx\n",
891                      dn, dn->d_count,
892                      realdn, realdn->d_count,
893                      realdn->d_inode, ceph_vinop(realdn->d_inode));
894                 dput(dn);
895                 dn = realdn;
896         } else {
897                 BUG_ON(!ceph_dentry(dn));
898                 dout("dn %p attached to %p ino %llx.%llx\n",
899                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
900         }
901         if ((!prehash || *prehash) && d_unhashed(dn))
902                 d_rehash(dn);
903         if (set_offset)
904                 ceph_set_dentry_offset(dn);
905 out:
906         return dn;
907 }
908
909 /*
910  * Incorporate results into the local cache.  This is either just
911  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
912  * after a lookup).
913  *
914  * A reply may contain
915  *         a directory inode along with a dentry.
916  *  and/or a target inode
917  *
918  * Called with snap_rwsem (read).
919  */
920 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
921                     struct ceph_mds_session *session)
922 {
923         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
924         struct inode *in = NULL;
925         struct ceph_mds_reply_inode *ininfo;
926         struct ceph_vino vino;
927         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
928         int i = 0;
929         int err = 0;
930
931         dout("fill_trace %p is_dentry %d is_target %d\n", req,
932              rinfo->head->is_dentry, rinfo->head->is_target);
933
934 #if 0
935         /*
936          * Debugging hook:
937          *
938          * If we resend completed ops to a recovering mds, we get no
939          * trace.  Since that is very rare, pretend this is the case
940          * to ensure the 'no trace' handlers in the callers behave.
941          *
942          * Fill in inodes unconditionally to avoid breaking cap
943          * invariants.
944          */
945         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
946                 pr_info("fill_trace faking empty trace on %lld %s\n",
947                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
948                 if (rinfo->head->is_dentry) {
949                         rinfo->head->is_dentry = 0;
950                         err = fill_inode(req->r_locked_dir,
951                                          &rinfo->diri, rinfo->dirfrag,
952                                          session, req->r_request_started, -1);
953                 }
954                 if (rinfo->head->is_target) {
955                         rinfo->head->is_target = 0;
956                         ininfo = rinfo->targeti.in;
957                         vino.ino = le64_to_cpu(ininfo->ino);
958                         vino.snap = le64_to_cpu(ininfo->snapid);
959                         in = ceph_get_inode(sb, vino);
960                         err = fill_inode(in, &rinfo->targeti, NULL,
961                                          session, req->r_request_started,
962                                          req->r_fmode);
963                         iput(in);
964                 }
965         }
966 #endif
967
968         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
969                 dout("fill_trace reply is empty!\n");
970                 if (rinfo->head->result == 0 && req->r_locked_dir)
971                         ceph_invalidate_dir_request(req);
972                 return 0;
973         }
974
975         if (rinfo->head->is_dentry) {
976                 struct inode *dir = req->r_locked_dir;
977
978                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
979                                  session, req->r_request_started, -1,
980                                  &req->r_caps_reservation);
981                 if (err < 0)
982                         return err;
983         }
984
985         /*
986          * ignore null lease/binding on snapdir ENOENT, or else we
987          * will have trouble splicing in the virtual snapdir later
988          */
989         if (rinfo->head->is_dentry && !req->r_aborted &&
990             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
991                                                fsc->mount_options->snapdir_name,
992                                                req->r_dentry->d_name.len))) {
993                 /*
994                  * lookup link rename   : null -> possibly existing inode
995                  * mknod symlink mkdir  : null -> new inode
996                  * unlink               : linked -> null
997                  */
998                 struct inode *dir = req->r_locked_dir;
999                 struct dentry *dn = req->r_dentry;
1000                 bool have_dir_cap, have_lease;
1001
1002                 BUG_ON(!dn);
1003                 BUG_ON(!dir);
1004                 BUG_ON(dn->d_parent->d_inode != dir);
1005                 BUG_ON(ceph_ino(dir) !=
1006                        le64_to_cpu(rinfo->diri.in->ino));
1007                 BUG_ON(ceph_snap(dir) !=
1008                        le64_to_cpu(rinfo->diri.in->snapid));
1009
1010                 /* do we have a lease on the whole dir? */
1011                 have_dir_cap =
1012                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1013                          CEPH_CAP_FILE_SHARED);
1014
1015                 /* do we have a dn lease? */
1016                 have_lease = have_dir_cap ||
1017                         (le16_to_cpu(rinfo->dlease->mask) &
1018                          CEPH_LOCK_DN);
1019
1020                 if (!have_lease)
1021                         dout("fill_trace  no dentry lease or dir cap\n");
1022
1023                 /* rename? */
1024                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1025                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1026                              req->r_old_dentry,
1027                              req->r_old_dentry->d_name.len,
1028                              req->r_old_dentry->d_name.name,
1029                              dn, dn->d_name.len, dn->d_name.name);
1030                         dout("fill_trace doing d_move %p -> %p\n",
1031                              req->r_old_dentry, dn);
1032
1033                         /* d_move screws up d_subdirs order */
1034                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1035
1036                         d_move(req->r_old_dentry, dn);
1037                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1038                              req->r_old_dentry,
1039                              req->r_old_dentry->d_name.len,
1040                              req->r_old_dentry->d_name.name,
1041                              dn, dn->d_name.len, dn->d_name.name);
1042
1043                         /* ensure target dentry is invalidated, despite
1044                            rehashing bug in vfs_rename_dir */
1045                         ceph_invalidate_dentry_lease(dn);
1046
1047                         /* take overwritten dentry's readdir offset */
1048                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1049                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1050                              ceph_dentry(req->r_old_dentry)->offset);
1051                         ceph_dentry(req->r_old_dentry)->offset =
1052                                 ceph_dentry(dn)->offset;
1053
1054                         dn = req->r_old_dentry;  /* use old_dentry */
1055                         in = dn->d_inode;
1056                 }
1057
1058                 /* null dentry? */
1059                 if (!rinfo->head->is_target) {
1060                         dout("fill_trace null dentry\n");
1061                         if (dn->d_inode) {
1062                                 dout("d_delete %p\n", dn);
1063                                 d_delete(dn);
1064                         } else {
1065                                 dout("d_instantiate %p NULL\n", dn);
1066                                 d_instantiate(dn, NULL);
1067                                 if (have_lease && d_unhashed(dn))
1068                                         d_rehash(dn);
1069                                 update_dentry_lease(dn, rinfo->dlease,
1070                                                     session,
1071                                                     req->r_request_started);
1072                         }
1073                         goto done;
1074                 }
1075
1076                 /* attach proper inode */
1077                 ininfo = rinfo->targeti.in;
1078                 vino.ino = le64_to_cpu(ininfo->ino);
1079                 vino.snap = le64_to_cpu(ininfo->snapid);
1080                 in = dn->d_inode;
1081                 if (!in) {
1082                         in = ceph_get_inode(sb, vino);
1083                         if (IS_ERR(in)) {
1084                                 pr_err("fill_trace bad get_inode "
1085                                        "%llx.%llx\n", vino.ino, vino.snap);
1086                                 err = PTR_ERR(in);
1087                                 d_delete(dn);
1088                                 goto done;
1089                         }
1090                         dn = splice_dentry(dn, in, &have_lease, true);
1091                         if (IS_ERR(dn)) {
1092                                 err = PTR_ERR(dn);
1093                                 goto done;
1094                         }
1095                         req->r_dentry = dn;  /* may have spliced */
1096                         igrab(in);
1097                 } else if (ceph_ino(in) == vino.ino &&
1098                            ceph_snap(in) == vino.snap) {
1099                         igrab(in);
1100                 } else {
1101                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1102                              dn, in, ceph_ino(in), ceph_snap(in),
1103                              vino.ino, vino.snap);
1104                         have_lease = false;
1105                         in = NULL;
1106                 }
1107
1108                 if (have_lease)
1109                         update_dentry_lease(dn, rinfo->dlease, session,
1110                                             req->r_request_started);
1111                 dout(" final dn %p\n", dn);
1112                 i++;
1113         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1114                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1115                 struct dentry *dn = req->r_dentry;
1116
1117                 /* fill out a snapdir LOOKUPSNAP dentry */
1118                 BUG_ON(!dn);
1119                 BUG_ON(!req->r_locked_dir);
1120                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1121                 ininfo = rinfo->targeti.in;
1122                 vino.ino = le64_to_cpu(ininfo->ino);
1123                 vino.snap = le64_to_cpu(ininfo->snapid);
1124                 in = ceph_get_inode(sb, vino);
1125                 if (IS_ERR(in)) {
1126                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1127                                vino.ino, vino.snap);
1128                         err = PTR_ERR(in);
1129                         d_delete(dn);
1130                         goto done;
1131                 }
1132                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1133                 dn = splice_dentry(dn, in, NULL, true);
1134                 if (IS_ERR(dn)) {
1135                         err = PTR_ERR(dn);
1136                         goto done;
1137                 }
1138                 req->r_dentry = dn;  /* may have spliced */
1139                 igrab(in);
1140                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1141         }
1142
1143         if (rinfo->head->is_target) {
1144                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1145                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1146
1147                 if (in == NULL || ceph_ino(in) != vino.ino ||
1148                     ceph_snap(in) != vino.snap) {
1149                         in = ceph_get_inode(sb, vino);
1150                         if (IS_ERR(in)) {
1151                                 err = PTR_ERR(in);
1152                                 goto done;
1153                         }
1154                 }
1155                 req->r_target_inode = in;
1156
1157                 err = fill_inode(in,
1158                                  &rinfo->targeti, NULL,
1159                                  session, req->r_request_started,
1160                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1161                                  req->r_fmode : -1,
1162                                  &req->r_caps_reservation);
1163                 if (err < 0) {
1164                         pr_err("fill_inode badness %p %llx.%llx\n",
1165                                in, ceph_vinop(in));
1166                         goto done;
1167                 }
1168         }
1169
1170 done:
1171         dout("fill_trace done err=%d\n", err);
1172         return err;
1173 }
1174
1175 /*
1176  * Prepopulate our cache with readdir results, leases, etc.
1177  */
1178 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1179                              struct ceph_mds_session *session)
1180 {
1181         struct dentry *parent = req->r_dentry;
1182         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1183         struct qstr dname;
1184         struct dentry *dn;
1185         struct inode *in;
1186         int err = 0, i;
1187         struct inode *snapdir = NULL;
1188         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1189         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1190         struct ceph_dentry_info *di;
1191
1192         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1193                 snapdir = ceph_get_snapdir(parent->d_inode);
1194                 parent = d_find_alias(snapdir);
1195                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1196                      rinfo->dir_nr, parent);
1197         } else {
1198                 dout("readdir_prepopulate %d items under dn %p\n",
1199                      rinfo->dir_nr, parent);
1200                 if (rinfo->dir_dir)
1201                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1202         }
1203
1204         for (i = 0; i < rinfo->dir_nr; i++) {
1205                 struct ceph_vino vino;
1206
1207                 dname.name = rinfo->dir_dname[i];
1208                 dname.len = rinfo->dir_dname_len[i];
1209                 dname.hash = full_name_hash(dname.name, dname.len);
1210
1211                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1212                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1213
1214 retry_lookup:
1215                 dn = d_lookup(parent, &dname);
1216                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1217                      parent, dname.len, dname.name, dn);
1218
1219                 if (!dn) {
1220                         dn = d_alloc(parent, &dname);
1221                         dout("d_alloc %p '%.*s' = %p\n", parent,
1222                              dname.len, dname.name, dn);
1223                         if (dn == NULL) {
1224                                 dout("d_alloc badness\n");
1225                                 err = -ENOMEM;
1226                                 goto out;
1227                         }
1228                         err = ceph_init_dentry(dn);
1229                         if (err < 0) {
1230                                 dput(dn);
1231                                 goto out;
1232                         }
1233                 } else if (dn->d_inode &&
1234                            (ceph_ino(dn->d_inode) != vino.ino ||
1235                             ceph_snap(dn->d_inode) != vino.snap)) {
1236                         dout(" dn %p points to wrong inode %p\n",
1237                              dn, dn->d_inode);
1238                         d_delete(dn);
1239                         dput(dn);
1240                         goto retry_lookup;
1241                 } else {
1242                         /* reorder parent's d_subdirs */
1243                         spin_lock(&parent->d_lock);
1244                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1245                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1246                         spin_unlock(&dn->d_lock);
1247                         spin_unlock(&parent->d_lock);
1248                 }
1249
1250                 di = dn->d_fsdata;
1251                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1252
1253                 /* inode */
1254                 if (dn->d_inode) {
1255                         in = dn->d_inode;
1256                 } else {
1257                         in = ceph_get_inode(parent->d_sb, vino);
1258                         if (IS_ERR(in)) {
1259                                 dout("new_inode badness\n");
1260                                 d_delete(dn);
1261                                 dput(dn);
1262                                 err = PTR_ERR(in);
1263                                 goto out;
1264                         }
1265                         dn = splice_dentry(dn, in, NULL, false);
1266                         if (IS_ERR(dn))
1267                                 dn = NULL;
1268                 }
1269
1270                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1271                                req->r_request_started, -1,
1272                                &req->r_caps_reservation) < 0) {
1273                         pr_err("fill_inode badness on %p\n", in);
1274                         goto next_item;
1275                 }
1276                 if (dn)
1277                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1278                                             req->r_session,
1279                                             req->r_request_started);
1280 next_item:
1281                 if (dn)
1282                         dput(dn);
1283         }
1284         req->r_did_prepopulate = true;
1285
1286 out:
1287         if (snapdir) {
1288                 iput(snapdir);
1289                 dput(parent);
1290         }
1291         dout("readdir_prepopulate done\n");
1292         return err;
1293 }
1294
1295 int ceph_inode_set_size(struct inode *inode, loff_t size)
1296 {
1297         struct ceph_inode_info *ci = ceph_inode(inode);
1298         int ret = 0;
1299
1300         spin_lock(&inode->i_lock);
1301         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1302         inode->i_size = size;
1303         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1304
1305         /* tell the MDS if we are approaching max_size */
1306         if ((size << 1) >= ci->i_max_size &&
1307             (ci->i_reported_size << 1) < ci->i_max_size)
1308                 ret = 1;
1309
1310         spin_unlock(&inode->i_lock);
1311         return ret;
1312 }
1313
1314 /*
1315  * Write back inode data in a worker thread.  (This can't be done
1316  * in the message handler context.)
1317  */
1318 void ceph_queue_writeback(struct inode *inode)
1319 {
1320         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1321                        &ceph_inode(inode)->i_wb_work)) {
1322                 dout("ceph_queue_writeback %p\n", inode);
1323                 igrab(inode);
1324         } else {
1325                 dout("ceph_queue_writeback %p failed\n", inode);
1326         }
1327 }
1328
1329 static void ceph_writeback_work(struct work_struct *work)
1330 {
1331         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1332                                                   i_wb_work);
1333         struct inode *inode = &ci->vfs_inode;
1334
1335         dout("writeback %p\n", inode);
1336         filemap_fdatawrite(&inode->i_data);
1337         iput(inode);
1338 }
1339
1340 /*
1341  * queue an async invalidation
1342  */
1343 void ceph_queue_invalidate(struct inode *inode)
1344 {
1345         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1346                        &ceph_inode(inode)->i_pg_inv_work)) {
1347                 dout("ceph_queue_invalidate %p\n", inode);
1348                 igrab(inode);
1349         } else {
1350                 dout("ceph_queue_invalidate %p failed\n", inode);
1351         }
1352 }
1353
1354 /*
1355  * invalidate any pages that are not dirty or under writeback.  this
1356  * includes pages that are clean and mapped.
1357  */
1358 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1359 {
1360         struct pagevec pvec;
1361         pgoff_t next = 0;
1362         int i;
1363
1364         pagevec_init(&pvec, 0);
1365         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1366                 for (i = 0; i < pagevec_count(&pvec); i++) {
1367                         struct page *page = pvec.pages[i];
1368                         pgoff_t index;
1369                         int skip_page =
1370                                 (PageDirty(page) || PageWriteback(page));
1371
1372                         if (!skip_page)
1373                                 skip_page = !trylock_page(page);
1374
1375                         /*
1376                          * We really shouldn't be looking at the ->index of an
1377                          * unlocked page.  But we're not allowed to lock these
1378                          * pages.  So we rely upon nobody altering the ->index
1379                          * of this (pinned-by-us) page.
1380                          */
1381                         index = page->index;
1382                         if (index > next)
1383                                 next = index;
1384                         next++;
1385
1386                         if (skip_page)
1387                                 continue;
1388
1389                         generic_error_remove_page(mapping, page);
1390                         unlock_page(page);
1391                 }
1392                 pagevec_release(&pvec);
1393                 cond_resched();
1394         }
1395 }
1396
1397 /*
1398  * Invalidate inode pages in a worker thread.  (This can't be done
1399  * in the message handler context.)
1400  */
1401 static void ceph_invalidate_work(struct work_struct *work)
1402 {
1403         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1404                                                   i_pg_inv_work);
1405         struct inode *inode = &ci->vfs_inode;
1406         u32 orig_gen;
1407         int check = 0;
1408
1409         spin_lock(&inode->i_lock);
1410         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1411              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1412         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1413                 /* nevermind! */
1414                 spin_unlock(&inode->i_lock);
1415                 goto out;
1416         }
1417         orig_gen = ci->i_rdcache_gen;
1418         spin_unlock(&inode->i_lock);
1419
1420         ceph_invalidate_nondirty_pages(inode->i_mapping);
1421
1422         spin_lock(&inode->i_lock);
1423         if (orig_gen == ci->i_rdcache_gen &&
1424             orig_gen == ci->i_rdcache_revoking) {
1425                 dout("invalidate_pages %p gen %d successful\n", inode,
1426                      ci->i_rdcache_gen);
1427                 ci->i_rdcache_revoking--;
1428                 check = 1;
1429         } else {
1430                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1431                      inode, orig_gen, ci->i_rdcache_gen,
1432                      ci->i_rdcache_revoking);
1433         }
1434         spin_unlock(&inode->i_lock);
1435
1436         if (check)
1437                 ceph_check_caps(ci, 0, NULL);
1438 out:
1439         iput(inode);
1440 }
1441
1442
1443 /*
1444  * called by trunc_wq; take i_mutex ourselves
1445  *
1446  * We also truncate in a separate thread as well.
1447  */
1448 static void ceph_vmtruncate_work(struct work_struct *work)
1449 {
1450         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1451                                                   i_vmtruncate_work);
1452         struct inode *inode = &ci->vfs_inode;
1453
1454         dout("vmtruncate_work %p\n", inode);
1455         mutex_lock(&inode->i_mutex);
1456         __ceph_do_pending_vmtruncate(inode);
1457         mutex_unlock(&inode->i_mutex);
1458         iput(inode);
1459 }
1460
1461 /*
1462  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1463  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1464  */
1465 void ceph_queue_vmtruncate(struct inode *inode)
1466 {
1467         struct ceph_inode_info *ci = ceph_inode(inode);
1468
1469         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1470                        &ci->i_vmtruncate_work)) {
1471                 dout("ceph_queue_vmtruncate %p\n", inode);
1472                 igrab(inode);
1473         } else {
1474                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1475                      inode, ci->i_truncate_pending);
1476         }
1477 }
1478
1479 /*
1480  * called with i_mutex held.
1481  *
1482  * Make sure any pending truncation is applied before doing anything
1483  * that may depend on it.
1484  */
1485 void __ceph_do_pending_vmtruncate(struct inode *inode)
1486 {
1487         struct ceph_inode_info *ci = ceph_inode(inode);
1488         u64 to;
1489         int wrbuffer_refs, wake = 0;
1490
1491 retry:
1492         spin_lock(&inode->i_lock);
1493         if (ci->i_truncate_pending == 0) {
1494                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1495                 spin_unlock(&inode->i_lock);
1496                 return;
1497         }
1498
1499         /*
1500          * make sure any dirty snapped pages are flushed before we
1501          * possibly truncate them.. so write AND block!
1502          */
1503         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1504                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1505                      inode);
1506                 spin_unlock(&inode->i_lock);
1507                 filemap_write_and_wait_range(&inode->i_data, 0,
1508                                              inode->i_sb->s_maxbytes);
1509                 goto retry;
1510         }
1511
1512         to = ci->i_truncate_size;
1513         wrbuffer_refs = ci->i_wrbuffer_ref;
1514         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1515              ci->i_truncate_pending, to);
1516         spin_unlock(&inode->i_lock);
1517
1518         truncate_inode_pages(inode->i_mapping, to);
1519
1520         spin_lock(&inode->i_lock);
1521         ci->i_truncate_pending--;
1522         if (ci->i_truncate_pending == 0)
1523                 wake = 1;
1524         spin_unlock(&inode->i_lock);
1525
1526         if (wrbuffer_refs == 0)
1527                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1528         if (wake)
1529                 wake_up_all(&ci->i_cap_wq);
1530 }
1531
1532
1533 /*
1534  * symlinks
1535  */
1536 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1537 {
1538         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1539         nd_set_link(nd, ci->i_symlink);
1540         return NULL;
1541 }
1542
1543 static const struct inode_operations ceph_symlink_iops = {
1544         .readlink = generic_readlink,
1545         .follow_link = ceph_sym_follow_link,
1546 };
1547
1548 /*
1549  * setattr
1550  */
1551 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1552 {
1553         struct inode *inode = dentry->d_inode;
1554         struct ceph_inode_info *ci = ceph_inode(inode);
1555         struct inode *parent_inode = dentry->d_parent->d_inode;
1556         const unsigned int ia_valid = attr->ia_valid;
1557         struct ceph_mds_request *req;
1558         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1559         int issued;
1560         int release = 0, dirtied = 0;
1561         int mask = 0;
1562         int err = 0;
1563
1564         if (ceph_snap(inode) != CEPH_NOSNAP)
1565                 return -EROFS;
1566
1567         __ceph_do_pending_vmtruncate(inode);
1568
1569         err = inode_change_ok(inode, attr);
1570         if (err != 0)
1571                 return err;
1572
1573         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1574                                        USE_AUTH_MDS);
1575         if (IS_ERR(req))
1576                 return PTR_ERR(req);
1577
1578         spin_lock(&inode->i_lock);
1579         issued = __ceph_caps_issued(ci, NULL);
1580         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1581
1582         if (ia_valid & ATTR_UID) {
1583                 dout("setattr %p uid %d -> %d\n", inode,
1584                      inode->i_uid, attr->ia_uid);
1585                 if (issued & CEPH_CAP_AUTH_EXCL) {
1586                         inode->i_uid = attr->ia_uid;
1587                         dirtied |= CEPH_CAP_AUTH_EXCL;
1588                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1589                            attr->ia_uid != inode->i_uid) {
1590                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1591                         mask |= CEPH_SETATTR_UID;
1592                         release |= CEPH_CAP_AUTH_SHARED;
1593                 }
1594         }
1595         if (ia_valid & ATTR_GID) {
1596                 dout("setattr %p gid %d -> %d\n", inode,
1597                      inode->i_gid, attr->ia_gid);
1598                 if (issued & CEPH_CAP_AUTH_EXCL) {
1599                         inode->i_gid = attr->ia_gid;
1600                         dirtied |= CEPH_CAP_AUTH_EXCL;
1601                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1602                            attr->ia_gid != inode->i_gid) {
1603                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1604                         mask |= CEPH_SETATTR_GID;
1605                         release |= CEPH_CAP_AUTH_SHARED;
1606                 }
1607         }
1608         if (ia_valid & ATTR_MODE) {
1609                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1610                      attr->ia_mode);
1611                 if (issued & CEPH_CAP_AUTH_EXCL) {
1612                         inode->i_mode = attr->ia_mode;
1613                         dirtied |= CEPH_CAP_AUTH_EXCL;
1614                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1615                            attr->ia_mode != inode->i_mode) {
1616                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1617                         mask |= CEPH_SETATTR_MODE;
1618                         release |= CEPH_CAP_AUTH_SHARED;
1619                 }
1620         }
1621
1622         if (ia_valid & ATTR_ATIME) {
1623                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1624                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1625                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1626                 if (issued & CEPH_CAP_FILE_EXCL) {
1627                         ci->i_time_warp_seq++;
1628                         inode->i_atime = attr->ia_atime;
1629                         dirtied |= CEPH_CAP_FILE_EXCL;
1630                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1631                            timespec_compare(&inode->i_atime,
1632                                             &attr->ia_atime) < 0) {
1633                         inode->i_atime = attr->ia_atime;
1634                         dirtied |= CEPH_CAP_FILE_WR;
1635                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1636                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1637                         ceph_encode_timespec(&req->r_args.setattr.atime,
1638                                              &attr->ia_atime);
1639                         mask |= CEPH_SETATTR_ATIME;
1640                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1641                                 CEPH_CAP_FILE_WR;
1642                 }
1643         }
1644         if (ia_valid & ATTR_MTIME) {
1645                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1646                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1647                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1648                 if (issued & CEPH_CAP_FILE_EXCL) {
1649                         ci->i_time_warp_seq++;
1650                         inode->i_mtime = attr->ia_mtime;
1651                         dirtied |= CEPH_CAP_FILE_EXCL;
1652                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1653                            timespec_compare(&inode->i_mtime,
1654                                             &attr->ia_mtime) < 0) {
1655                         inode->i_mtime = attr->ia_mtime;
1656                         dirtied |= CEPH_CAP_FILE_WR;
1657                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1658                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1659                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1660                                              &attr->ia_mtime);
1661                         mask |= CEPH_SETATTR_MTIME;
1662                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1663                                 CEPH_CAP_FILE_WR;
1664                 }
1665         }
1666         if (ia_valid & ATTR_SIZE) {
1667                 dout("setattr %p size %lld -> %lld\n", inode,
1668                      inode->i_size, attr->ia_size);
1669                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1670                         err = -EINVAL;
1671                         goto out;
1672                 }
1673                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1674                     attr->ia_size > inode->i_size) {
1675                         inode->i_size = attr->ia_size;
1676                         inode->i_blocks =
1677                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1678                         inode->i_ctime = attr->ia_ctime;
1679                         ci->i_reported_size = attr->ia_size;
1680                         dirtied |= CEPH_CAP_FILE_EXCL;
1681                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1682                            attr->ia_size != inode->i_size) {
1683                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1684                         req->r_args.setattr.old_size =
1685                                 cpu_to_le64(inode->i_size);
1686                         mask |= CEPH_SETATTR_SIZE;
1687                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1688                                 CEPH_CAP_FILE_WR;
1689                 }
1690         }
1691
1692         /* these do nothing */
1693         if (ia_valid & ATTR_CTIME) {
1694                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1695                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1696                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1697                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1698                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1699                      only ? "ctime only" : "ignored");
1700                 inode->i_ctime = attr->ia_ctime;
1701                 if (only) {
1702                         /*
1703                          * if kernel wants to dirty ctime but nothing else,
1704                          * we need to choose a cap to dirty under, or do
1705                          * a almost-no-op setattr
1706                          */
1707                         if (issued & CEPH_CAP_AUTH_EXCL)
1708                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1709                         else if (issued & CEPH_CAP_FILE_EXCL)
1710                                 dirtied |= CEPH_CAP_FILE_EXCL;
1711                         else if (issued & CEPH_CAP_XATTR_EXCL)
1712                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1713                         else
1714                                 mask |= CEPH_SETATTR_CTIME;
1715                 }
1716         }
1717         if (ia_valid & ATTR_FILE)
1718                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1719
1720         if (dirtied) {
1721                 __ceph_mark_dirty_caps(ci, dirtied);
1722                 inode->i_ctime = CURRENT_TIME;
1723         }
1724
1725         release &= issued;
1726         spin_unlock(&inode->i_lock);
1727
1728         if (mask) {
1729                 req->r_inode = igrab(inode);
1730                 req->r_inode_drop = release;
1731                 req->r_args.setattr.mask = cpu_to_le32(mask);
1732                 req->r_num_caps = 1;
1733                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1734         }
1735         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1736              ceph_cap_string(dirtied), mask);
1737
1738         ceph_mdsc_put_request(req);
1739         __ceph_do_pending_vmtruncate(inode);
1740         return err;
1741 out:
1742         spin_unlock(&inode->i_lock);
1743         ceph_mdsc_put_request(req);
1744         return err;
1745 }
1746
1747 /*
1748  * Verify that we have a lease on the given mask.  If not,
1749  * do a getattr against an mds.
1750  */
1751 int ceph_do_getattr(struct inode *inode, int mask)
1752 {
1753         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1754         struct ceph_mds_client *mdsc = fsc->mdsc;
1755         struct ceph_mds_request *req;
1756         int err;
1757
1758         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1759                 dout("do_getattr inode %p SNAPDIR\n", inode);
1760                 return 0;
1761         }
1762
1763         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1764         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1765                 return 0;
1766
1767         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1768         if (IS_ERR(req))
1769                 return PTR_ERR(req);
1770         req->r_inode = igrab(inode);
1771         req->r_num_caps = 1;
1772         req->r_args.getattr.mask = cpu_to_le32(mask);
1773         err = ceph_mdsc_do_request(mdsc, NULL, req);
1774         ceph_mdsc_put_request(req);
1775         dout("do_getattr result=%d\n", err);
1776         return err;
1777 }
1778
1779
1780 /*
1781  * Check inode permissions.  We verify we have a valid value for
1782  * the AUTH cap, then call the generic handler.
1783  */
1784 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1785 {
1786         int err;
1787
1788         if (flags & IPERM_FLAG_RCU)
1789                 return -ECHILD;
1790
1791         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1792
1793         if (!err)
1794                 err = generic_permission(inode, mask, flags, NULL);
1795         return err;
1796 }
1797
1798 /*
1799  * Get all attributes.  Hopefully somedata we'll have a statlite()
1800  * and can limit the fields we require to be accurate.
1801  */
1802 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1803                  struct kstat *stat)
1804 {
1805         struct inode *inode = dentry->d_inode;
1806         struct ceph_inode_info *ci = ceph_inode(inode);
1807         int err;
1808
1809         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1810         if (!err) {
1811                 generic_fillattr(inode, stat);
1812                 stat->ino = inode->i_ino;
1813                 if (ceph_snap(inode) != CEPH_NOSNAP)
1814                         stat->dev = ceph_snap(inode);
1815                 else
1816                         stat->dev = 0;
1817                 if (S_ISDIR(inode->i_mode)) {
1818                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1819                                                 RBYTES))
1820                                 stat->size = ci->i_rbytes;
1821                         else
1822                                 stat->size = ci->i_files + ci->i_subdirs;
1823                         stat->blocks = 0;
1824                         stat->blksize = 65536;
1825                 }
1826         }
1827         return err;
1828 }