Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[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 static int ceph_set_ino_cb(struct inode *inode, void *data)
40 {
41         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
42         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
43         return 0;
44 }
45
46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
47 {
48         struct inode *inode;
49         ino_t t = ceph_vino_to_ino(vino);
50
51         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
52         if (inode == NULL)
53                 return ERR_PTR(-ENOMEM);
54         if (inode->i_state & I_NEW) {
55                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
56                      inode, ceph_vinop(inode), (u64)inode->i_ino);
57                 unlock_new_inode(inode);
58         }
59
60         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
61              vino.snap, inode);
62         return inode;
63 }
64
65 /*
66  * get/constuct snapdir inode for a given directory
67  */
68 struct inode *ceph_get_snapdir(struct inode *parent)
69 {
70         struct ceph_vino vino = {
71                 .ino = ceph_ino(parent),
72                 .snap = CEPH_SNAPDIR,
73         };
74         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
75         struct ceph_inode_info *ci = ceph_inode(inode);
76
77         BUG_ON(!S_ISDIR(parent->i_mode));
78         if (IS_ERR(inode))
79                 return inode;
80         inode->i_mode = parent->i_mode;
81         inode->i_uid = parent->i_uid;
82         inode->i_gid = parent->i_gid;
83         inode->i_op = &ceph_dir_iops;
84         inode->i_fop = &ceph_dir_fops;
85         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
86         ci->i_rbytes = 0;
87         return inode;
88 }
89
90 const struct inode_operations ceph_file_iops = {
91         .permission = ceph_permission,
92         .setattr = ceph_setattr,
93         .getattr = ceph_getattr,
94         .setxattr = ceph_setxattr,
95         .getxattr = ceph_getxattr,
96         .listxattr = ceph_listxattr,
97         .removexattr = ceph_removexattr,
98 };
99
100
101 /*
102  * We use a 'frag tree' to keep track of the MDS's directory fragments
103  * for a given inode (usually there is just a single fragment).  We
104  * need to know when a child frag is delegated to a new MDS, or when
105  * it is flagged as replicated, so we can direct our requests
106  * accordingly.
107  */
108
109 /*
110  * find/create a frag in the tree
111  */
112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
113                                                     u32 f)
114 {
115         struct rb_node **p;
116         struct rb_node *parent = NULL;
117         struct ceph_inode_frag *frag;
118         int c;
119
120         p = &ci->i_fragtree.rb_node;
121         while (*p) {
122                 parent = *p;
123                 frag = rb_entry(parent, struct ceph_inode_frag, node);
124                 c = ceph_frag_compare(f, frag->frag);
125                 if (c < 0)
126                         p = &(*p)->rb_left;
127                 else if (c > 0)
128                         p = &(*p)->rb_right;
129                 else
130                         return frag;
131         }
132
133         frag = kmalloc(sizeof(*frag), GFP_NOFS);
134         if (!frag) {
135                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
136                        "frag %x\n", &ci->vfs_inode,
137                        ceph_vinop(&ci->vfs_inode), f);
138                 return ERR_PTR(-ENOMEM);
139         }
140         frag->frag = f;
141         frag->split_by = 0;
142         frag->mds = -1;
143         frag->ndist = 0;
144
145         rb_link_node(&frag->node, parent, p);
146         rb_insert_color(&frag->node, &ci->i_fragtree);
147
148         dout("get_or_create_frag added %llx.%llx frag %x\n",
149              ceph_vinop(&ci->vfs_inode), f);
150         return frag;
151 }
152
153 /*
154  * find a specific frag @f
155  */
156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
157 {
158         struct rb_node *n = ci->i_fragtree.rb_node;
159
160         while (n) {
161                 struct ceph_inode_frag *frag =
162                         rb_entry(n, struct ceph_inode_frag, node);
163                 int c = ceph_frag_compare(f, frag->frag);
164                 if (c < 0)
165                         n = n->rb_left;
166                 else if (c > 0)
167                         n = n->rb_right;
168                 else
169                         return frag;
170         }
171         return NULL;
172 }
173
174 /*
175  * Choose frag containing the given value @v.  If @pfrag is
176  * specified, copy the frag delegation info to the caller if
177  * it is present.
178  */
179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180                      struct ceph_inode_frag *pfrag,
181                      int *found)
182 {
183         u32 t = ceph_frag_make(0, 0);
184         struct ceph_inode_frag *frag;
185         unsigned nway, i;
186         u32 n;
187
188         if (found)
189                 *found = 0;
190
191         mutex_lock(&ci->i_fragtree_mutex);
192         while (1) {
193                 WARN_ON(!ceph_frag_contains_value(t, v));
194                 frag = __ceph_find_frag(ci, t);
195                 if (!frag)
196                         break; /* t is a leaf */
197                 if (frag->split_by == 0) {
198                         if (pfrag)
199                                 memcpy(pfrag, frag, sizeof(*pfrag));
200                         if (found)
201                                 *found = 1;
202                         break;
203                 }
204
205                 /* choose child */
206                 nway = 1 << frag->split_by;
207                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
208                      frag->split_by, nway);
209                 for (i = 0; i < nway; i++) {
210                         n = ceph_frag_make_child(t, frag->split_by, i);
211                         if (ceph_frag_contains_value(n, v)) {
212                                 t = n;
213                                 break;
214                         }
215                 }
216                 BUG_ON(i == nway);
217         }
218         dout("choose_frag(%x) = %x\n", v, t);
219
220         mutex_unlock(&ci->i_fragtree_mutex);
221         return t;
222 }
223
224 /*
225  * Process dirfrag (delegation) info from the mds.  Include leaf
226  * fragment in tree ONLY if ndist > 0.  Otherwise, only
227  * branches/splits are included in i_fragtree)
228  */
229 static int ceph_fill_dirfrag(struct inode *inode,
230                              struct ceph_mds_reply_dirfrag *dirinfo)
231 {
232         struct ceph_inode_info *ci = ceph_inode(inode);
233         struct ceph_inode_frag *frag;
234         u32 id = le32_to_cpu(dirinfo->frag);
235         int mds = le32_to_cpu(dirinfo->auth);
236         int ndist = le32_to_cpu(dirinfo->ndist);
237         int i;
238         int err = 0;
239
240         mutex_lock(&ci->i_fragtree_mutex);
241         if (ndist == 0) {
242                 /* no delegation info needed. */
243                 frag = __ceph_find_frag(ci, id);
244                 if (!frag)
245                         goto out;
246                 if (frag->split_by == 0) {
247                         /* tree leaf, remove */
248                         dout("fill_dirfrag removed %llx.%llx frag %x"
249                              " (no ref)\n", ceph_vinop(inode), id);
250                         rb_erase(&frag->node, &ci->i_fragtree);
251                         kfree(frag);
252                 } else {
253                         /* tree branch, keep and clear */
254                         dout("fill_dirfrag cleared %llx.%llx frag %x"
255                              " referral\n", ceph_vinop(inode), id);
256                         frag->mds = -1;
257                         frag->ndist = 0;
258                 }
259                 goto out;
260         }
261
262
263         /* find/add this frag to store mds delegation info */
264         frag = __get_or_create_frag(ci, id);
265         if (IS_ERR(frag)) {
266                 /* this is not the end of the world; we can continue
267                    with bad/inaccurate delegation info */
268                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
269                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
270                 err = -ENOMEM;
271                 goto out;
272         }
273
274         frag->mds = mds;
275         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
276         for (i = 0; i < frag->ndist; i++)
277                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
278         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
279              ceph_vinop(inode), frag->frag, frag->ndist);
280
281 out:
282         mutex_unlock(&ci->i_fragtree_mutex);
283         return err;
284 }
285
286
287 /*
288  * initialize a newly allocated inode.
289  */
290 struct inode *ceph_alloc_inode(struct super_block *sb)
291 {
292         struct ceph_inode_info *ci;
293         int i;
294
295         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
296         if (!ci)
297                 return NULL;
298
299         dout("alloc_inode %p\n", &ci->vfs_inode);
300
301         ci->i_version = 0;
302         ci->i_time_warp_seq = 0;
303         ci->i_ceph_flags = 0;
304         ci->i_release_count = 0;
305         ci->i_symlink = NULL;
306
307         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
308
309         ci->i_fragtree = RB_ROOT;
310         mutex_init(&ci->i_fragtree_mutex);
311
312         ci->i_xattrs.blob = NULL;
313         ci->i_xattrs.prealloc_blob = NULL;
314         ci->i_xattrs.dirty = false;
315         ci->i_xattrs.index = RB_ROOT;
316         ci->i_xattrs.count = 0;
317         ci->i_xattrs.names_size = 0;
318         ci->i_xattrs.vals_size = 0;
319         ci->i_xattrs.version = 0;
320         ci->i_xattrs.index_version = 0;
321
322         ci->i_caps = RB_ROOT;
323         ci->i_auth_cap = NULL;
324         ci->i_dirty_caps = 0;
325         ci->i_flushing_caps = 0;
326         INIT_LIST_HEAD(&ci->i_dirty_item);
327         INIT_LIST_HEAD(&ci->i_flushing_item);
328         ci->i_cap_flush_seq = 0;
329         ci->i_cap_flush_last_tid = 0;
330         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
331         init_waitqueue_head(&ci->i_cap_wq);
332         ci->i_hold_caps_min = 0;
333         ci->i_hold_caps_max = 0;
334         INIT_LIST_HEAD(&ci->i_cap_delay_list);
335         ci->i_cap_exporting_mds = 0;
336         ci->i_cap_exporting_mseq = 0;
337         ci->i_cap_exporting_issued = 0;
338         INIT_LIST_HEAD(&ci->i_cap_snaps);
339         ci->i_head_snapc = NULL;
340         ci->i_snap_caps = 0;
341
342         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
343                 ci->i_nr_by_mode[i] = 0;
344
345         ci->i_truncate_seq = 0;
346         ci->i_truncate_size = 0;
347         ci->i_truncate_pending = 0;
348
349         ci->i_max_size = 0;
350         ci->i_reported_size = 0;
351         ci->i_wanted_max_size = 0;
352         ci->i_requested_max_size = 0;
353
354         ci->i_pin_ref = 0;
355         ci->i_rd_ref = 0;
356         ci->i_rdcache_ref = 0;
357         ci->i_wr_ref = 0;
358         ci->i_wb_ref = 0;
359         ci->i_wrbuffer_ref = 0;
360         ci->i_wrbuffer_ref_head = 0;
361         ci->i_shared_gen = 0;
362         ci->i_rdcache_gen = 0;
363         ci->i_rdcache_revoking = 0;
364
365         INIT_LIST_HEAD(&ci->i_unsafe_writes);
366         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
367         spin_lock_init(&ci->i_unsafe_lock);
368
369         ci->i_snap_realm = NULL;
370         INIT_LIST_HEAD(&ci->i_snap_realm_item);
371         INIT_LIST_HEAD(&ci->i_snap_flush_item);
372
373         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
374         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
375
376         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
377
378         return &ci->vfs_inode;
379 }
380
381 static void ceph_i_callback(struct rcu_head *head)
382 {
383         struct inode *inode = container_of(head, struct inode, i_rcu);
384         struct ceph_inode_info *ci = ceph_inode(inode);
385
386         INIT_LIST_HEAD(&inode->i_dentry);
387         kmem_cache_free(ceph_inode_cachep, ci);
388 }
389
390 void ceph_destroy_inode(struct inode *inode)
391 {
392         struct ceph_inode_info *ci = ceph_inode(inode);
393         struct ceph_inode_frag *frag;
394         struct rb_node *n;
395
396         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
397
398         ceph_queue_caps_release(inode);
399
400         /*
401          * we may still have a snap_realm reference if there are stray
402          * caps in i_cap_exporting_issued or i_snap_caps.
403          */
404         if (ci->i_snap_realm) {
405                 struct ceph_mds_client *mdsc =
406                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
407                 struct ceph_snap_realm *realm = ci->i_snap_realm;
408
409                 dout(" dropping residual ref to snap realm %p\n", realm);
410                 spin_lock(&realm->inodes_with_caps_lock);
411                 list_del_init(&ci->i_snap_realm_item);
412                 spin_unlock(&realm->inodes_with_caps_lock);
413                 ceph_put_snap_realm(mdsc, realm);
414         }
415
416         kfree(ci->i_symlink);
417         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
418                 frag = rb_entry(n, struct ceph_inode_frag, node);
419                 rb_erase(n, &ci->i_fragtree);
420                 kfree(frag);
421         }
422
423         __ceph_destroy_xattrs(ci);
424         if (ci->i_xattrs.blob)
425                 ceph_buffer_put(ci->i_xattrs.blob);
426         if (ci->i_xattrs.prealloc_blob)
427                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
428
429         call_rcu(&inode->i_rcu, ceph_i_callback);
430 }
431
432
433 /*
434  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
435  * careful because either the client or MDS may have more up to date
436  * info, depending on which capabilities are held, and whether
437  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
438  * and size are monotonically increasing, except when utimes() or
439  * truncate() increments the corresponding _seq values.)
440  */
441 int ceph_fill_file_size(struct inode *inode, int issued,
442                         u32 truncate_seq, u64 truncate_size, u64 size)
443 {
444         struct ceph_inode_info *ci = ceph_inode(inode);
445         int queue_trunc = 0;
446
447         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
448             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
449                 dout("size %lld -> %llu\n", inode->i_size, size);
450                 inode->i_size = size;
451                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
452                 ci->i_reported_size = size;
453                 if (truncate_seq != ci->i_truncate_seq) {
454                         dout("truncate_seq %u -> %u\n",
455                              ci->i_truncate_seq, truncate_seq);
456                         ci->i_truncate_seq = truncate_seq;
457                         /*
458                          * If we hold relevant caps, or in the case where we're
459                          * not the only client referencing this file and we
460                          * don't hold those caps, then we need to check whether
461                          * the file is either opened or mmaped
462                          */
463                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
464                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
465                                        CEPH_CAP_FILE_EXCL|
466                                        CEPH_CAP_FILE_LAZYIO)) ||
467                             mapping_mapped(inode->i_mapping) ||
468                             __ceph_caps_file_wanted(ci)) {
469                                 ci->i_truncate_pending++;
470                                 queue_trunc = 1;
471                         }
472                 }
473         }
474         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
475             ci->i_truncate_size != truncate_size) {
476                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
477                      truncate_size);
478                 ci->i_truncate_size = truncate_size;
479         }
480         return queue_trunc;
481 }
482
483 void ceph_fill_file_time(struct inode *inode, int issued,
484                          u64 time_warp_seq, struct timespec *ctime,
485                          struct timespec *mtime, struct timespec *atime)
486 {
487         struct ceph_inode_info *ci = ceph_inode(inode);
488         int warn = 0;
489
490         if (issued & (CEPH_CAP_FILE_EXCL|
491                       CEPH_CAP_FILE_WR|
492                       CEPH_CAP_FILE_BUFFER|
493                       CEPH_CAP_AUTH_EXCL|
494                       CEPH_CAP_XATTR_EXCL)) {
495                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
496                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
497                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
498                              ctime->tv_sec, ctime->tv_nsec);
499                         inode->i_ctime = *ctime;
500                 }
501                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
502                         /* the MDS did a utimes() */
503                         dout("mtime %ld.%09ld -> %ld.%09ld "
504                              "tw %d -> %d\n",
505                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
506                              mtime->tv_sec, mtime->tv_nsec,
507                              ci->i_time_warp_seq, (int)time_warp_seq);
508
509                         inode->i_mtime = *mtime;
510                         inode->i_atime = *atime;
511                         ci->i_time_warp_seq = time_warp_seq;
512                 } else if (time_warp_seq == ci->i_time_warp_seq) {
513                         /* nobody did utimes(); take the max */
514                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
515                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
516                                      inode->i_mtime.tv_sec,
517                                      inode->i_mtime.tv_nsec,
518                                      mtime->tv_sec, mtime->tv_nsec);
519                                 inode->i_mtime = *mtime;
520                         }
521                         if (timespec_compare(atime, &inode->i_atime) > 0) {
522                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
523                                      inode->i_atime.tv_sec,
524                                      inode->i_atime.tv_nsec,
525                                      atime->tv_sec, atime->tv_nsec);
526                                 inode->i_atime = *atime;
527                         }
528                 } else if (issued & CEPH_CAP_FILE_EXCL) {
529                         /* we did a utimes(); ignore mds values */
530                 } else {
531                         warn = 1;
532                 }
533         } else {
534                 /* we have no write|excl caps; whatever the MDS says is true */
535                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
536                         inode->i_ctime = *ctime;
537                         inode->i_mtime = *mtime;
538                         inode->i_atime = *atime;
539                         ci->i_time_warp_seq = time_warp_seq;
540                 } else {
541                         warn = 1;
542                 }
543         }
544         if (warn) /* time_warp_seq shouldn't go backwards */
545                 dout("%p mds time_warp_seq %llu < %u\n",
546                      inode, time_warp_seq, ci->i_time_warp_seq);
547 }
548
549 /*
550  * Populate an inode based on info from mds.  May be called on new or
551  * existing inodes.
552  */
553 static int fill_inode(struct inode *inode,
554                       struct ceph_mds_reply_info_in *iinfo,
555                       struct ceph_mds_reply_dirfrag *dirinfo,
556                       struct ceph_mds_session *session,
557                       unsigned long ttl_from, int cap_fmode,
558                       struct ceph_cap_reservation *caps_reservation)
559 {
560         struct ceph_mds_reply_inode *info = iinfo->in;
561         struct ceph_inode_info *ci = ceph_inode(inode);
562         int i;
563         int issued, implemented;
564         struct timespec mtime, atime, ctime;
565         u32 nsplits;
566         struct ceph_buffer *xattr_blob = NULL;
567         int err = 0;
568         int queue_trunc = 0;
569
570         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
571              inode, ceph_vinop(inode), le64_to_cpu(info->version),
572              ci->i_version);
573
574         /*
575          * prealloc xattr data, if it looks like we'll need it.  only
576          * if len > 4 (meaning there are actually xattrs; the first 4
577          * bytes are the xattr count).
578          */
579         if (iinfo->xattr_len > 4) {
580                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
581                 if (!xattr_blob)
582                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
583                                iinfo->xattr_len);
584         }
585
586         spin_lock(&inode->i_lock);
587
588         /*
589          * provided version will be odd if inode value is projected,
590          * even if stable.  skip the update if we have newer stable
591          * info (ours>=theirs, e.g. due to racing mds replies), unless
592          * we are getting projected (unstable) info (in which case the
593          * version is odd, and we want ours>theirs).
594          *   us   them
595          *   2    2     skip
596          *   3    2     skip
597          *   3    3     update
598          */
599         if (le64_to_cpu(info->version) > 0 &&
600             (ci->i_version & ~1) >= le64_to_cpu(info->version))
601                 goto no_change;
602
603         issued = __ceph_caps_issued(ci, &implemented);
604         issued |= implemented | __ceph_caps_dirty(ci);
605
606         /* update inode */
607         ci->i_version = le64_to_cpu(info->version);
608         inode->i_version++;
609         inode->i_rdev = le32_to_cpu(info->rdev);
610
611         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
612                 inode->i_mode = le32_to_cpu(info->mode);
613                 inode->i_uid = le32_to_cpu(info->uid);
614                 inode->i_gid = le32_to_cpu(info->gid);
615                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
616                      inode->i_uid, inode->i_gid);
617         }
618
619         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
620                 inode->i_nlink = le32_to_cpu(info->nlink);
621
622         /* be careful with mtime, atime, size */
623         ceph_decode_timespec(&atime, &info->atime);
624         ceph_decode_timespec(&mtime, &info->mtime);
625         ceph_decode_timespec(&ctime, &info->ctime);
626         queue_trunc = ceph_fill_file_size(inode, issued,
627                                           le32_to_cpu(info->truncate_seq),
628                                           le64_to_cpu(info->truncate_size),
629                                           le64_to_cpu(info->size));
630         ceph_fill_file_time(inode, issued,
631                             le32_to_cpu(info->time_warp_seq),
632                             &ctime, &mtime, &atime);
633
634         /* only update max_size on auth cap */
635         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
636             ci->i_max_size != le64_to_cpu(info->max_size)) {
637                 dout("max_size %lld -> %llu\n", ci->i_max_size,
638                      le64_to_cpu(info->max_size));
639                 ci->i_max_size = le64_to_cpu(info->max_size);
640         }
641
642         ci->i_layout = info->layout;
643         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
644
645         /* xattrs */
646         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
647         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
648             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
649                 if (ci->i_xattrs.blob)
650                         ceph_buffer_put(ci->i_xattrs.blob);
651                 ci->i_xattrs.blob = xattr_blob;
652                 if (xattr_blob)
653                         memcpy(ci->i_xattrs.blob->vec.iov_base,
654                                iinfo->xattr_data, iinfo->xattr_len);
655                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
656                 xattr_blob = NULL;
657         }
658
659         inode->i_mapping->a_ops = &ceph_aops;
660         inode->i_mapping->backing_dev_info =
661                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
662
663         switch (inode->i_mode & S_IFMT) {
664         case S_IFIFO:
665         case S_IFBLK:
666         case S_IFCHR:
667         case S_IFSOCK:
668                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
669                 inode->i_op = &ceph_file_iops;
670                 break;
671         case S_IFREG:
672                 inode->i_op = &ceph_file_iops;
673                 inode->i_fop = &ceph_file_fops;
674                 break;
675         case S_IFLNK:
676                 inode->i_op = &ceph_symlink_iops;
677                 if (!ci->i_symlink) {
678                         int symlen = iinfo->symlink_len;
679                         char *sym;
680
681                         BUG_ON(symlen != inode->i_size);
682                         spin_unlock(&inode->i_lock);
683
684                         err = -ENOMEM;
685                         sym = kmalloc(symlen+1, GFP_NOFS);
686                         if (!sym)
687                                 goto out;
688                         memcpy(sym, iinfo->symlink, symlen);
689                         sym[symlen] = 0;
690
691                         spin_lock(&inode->i_lock);
692                         if (!ci->i_symlink)
693                                 ci->i_symlink = sym;
694                         else
695                                 kfree(sym); /* lost a race */
696                 }
697                 break;
698         case S_IFDIR:
699                 inode->i_op = &ceph_dir_iops;
700                 inode->i_fop = &ceph_dir_fops;
701
702                 ci->i_dir_layout = iinfo->dir_layout;
703
704                 ci->i_files = le64_to_cpu(info->files);
705                 ci->i_subdirs = le64_to_cpu(info->subdirs);
706                 ci->i_rbytes = le64_to_cpu(info->rbytes);
707                 ci->i_rfiles = le64_to_cpu(info->rfiles);
708                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
709                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
710
711                 /* set dir completion flag? */
712                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
713                     ceph_snap(inode) == CEPH_NOSNAP &&
714                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
715                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
716                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
717                         dout(" marking %p complete (empty)\n", inode);
718                         /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
719                         ci->i_max_offset = 2;
720                 }
721                 break;
722         default:
723                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
724                        ceph_vinop(inode), inode->i_mode);
725         }
726
727 no_change:
728         spin_unlock(&inode->i_lock);
729
730         /* queue truncate if we saw i_size decrease */
731         if (queue_trunc)
732                 ceph_queue_vmtruncate(inode);
733
734         /* populate frag tree */
735         /* FIXME: move me up, if/when version reflects fragtree changes */
736         nsplits = le32_to_cpu(info->fragtree.nsplits);
737         mutex_lock(&ci->i_fragtree_mutex);
738         for (i = 0; i < nsplits; i++) {
739                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
740                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
741
742                 if (IS_ERR(frag))
743                         continue;
744                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
745                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
746         }
747         mutex_unlock(&ci->i_fragtree_mutex);
748
749         /* were we issued a capability? */
750         if (info->cap.caps) {
751                 if (ceph_snap(inode) == CEPH_NOSNAP) {
752                         ceph_add_cap(inode, session,
753                                      le64_to_cpu(info->cap.cap_id),
754                                      cap_fmode,
755                                      le32_to_cpu(info->cap.caps),
756                                      le32_to_cpu(info->cap.wanted),
757                                      le32_to_cpu(info->cap.seq),
758                                      le32_to_cpu(info->cap.mseq),
759                                      le64_to_cpu(info->cap.realm),
760                                      info->cap.flags,
761                                      caps_reservation);
762                 } else {
763                         spin_lock(&inode->i_lock);
764                         dout(" %p got snap_caps %s\n", inode,
765                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
766                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
767                         if (cap_fmode >= 0)
768                                 __ceph_get_fmode(ci, cap_fmode);
769                         spin_unlock(&inode->i_lock);
770                 }
771         } else if (cap_fmode >= 0) {
772                 pr_warning("mds issued no caps on %llx.%llx\n",
773                            ceph_vinop(inode));
774                 __ceph_get_fmode(ci, cap_fmode);
775         }
776
777         /* update delegation info? */
778         if (dirinfo)
779                 ceph_fill_dirfrag(inode, dirinfo);
780
781         err = 0;
782
783 out:
784         if (xattr_blob)
785                 ceph_buffer_put(xattr_blob);
786         return err;
787 }
788
789 /*
790  * caller should hold session s_mutex.
791  */
792 static void update_dentry_lease(struct dentry *dentry,
793                                 struct ceph_mds_reply_lease *lease,
794                                 struct ceph_mds_session *session,
795                                 unsigned long from_time)
796 {
797         struct ceph_dentry_info *di = ceph_dentry(dentry);
798         long unsigned duration = le32_to_cpu(lease->duration_ms);
799         long unsigned ttl = from_time + (duration * HZ) / 1000;
800         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
801         struct inode *dir;
802
803         /* only track leases on regular dentries */
804         if (dentry->d_op != &ceph_dentry_ops)
805                 return;
806
807         spin_lock(&dentry->d_lock);
808         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
809              dentry, le16_to_cpu(lease->mask), duration, ttl);
810
811         /* make lease_rdcache_gen match directory */
812         dir = dentry->d_parent->d_inode;
813         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
814
815         if (lease->mask == 0)
816                 goto out_unlock;
817
818         if (di->lease_gen == session->s_cap_gen &&
819             time_before(ttl, dentry->d_time))
820                 goto out_unlock;  /* we already have a newer lease. */
821
822         if (di->lease_session && di->lease_session != session)
823                 goto out_unlock;
824
825         ceph_dentry_lru_touch(dentry);
826
827         if (!di->lease_session)
828                 di->lease_session = ceph_get_mds_session(session);
829         di->lease_gen = session->s_cap_gen;
830         di->lease_seq = le32_to_cpu(lease->seq);
831         di->lease_renew_after = half_ttl;
832         di->lease_renew_from = 0;
833         dentry->d_time = ttl;
834 out_unlock:
835         spin_unlock(&dentry->d_lock);
836         return;
837 }
838
839 /*
840  * Set dentry's directory position based on the current dir's max, and
841  * order it in d_subdirs, so that dcache_readdir behaves.
842  */
843 static void ceph_set_dentry_offset(struct dentry *dn)
844 {
845         struct dentry *dir = dn->d_parent;
846         struct inode *inode = dn->d_parent->d_inode;
847         struct ceph_dentry_info *di;
848
849         BUG_ON(!inode);
850
851         di = ceph_dentry(dn);
852
853         spin_lock(&inode->i_lock);
854         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
855                 spin_unlock(&inode->i_lock);
856                 return;
857         }
858         di->offset = ceph_inode(inode)->i_max_offset++;
859         spin_unlock(&inode->i_lock);
860
861         spin_lock(&dir->d_lock);
862         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
863         list_move(&dn->d_u.d_child, &dir->d_subdirs);
864         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
865              dn->d_u.d_child.prev, dn->d_u.d_child.next);
866         spin_unlock(&dn->d_lock);
867         spin_unlock(&dir->d_lock);
868 }
869
870 /*
871  * splice a dentry to an inode.
872  * caller must hold directory i_mutex for this to be safe.
873  *
874  * we will only rehash the resulting dentry if @prehash is
875  * true; @prehash will be set to false (for the benefit of
876  * the caller) if we fail.
877  */
878 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
879                                     bool *prehash, bool set_offset)
880 {
881         struct dentry *realdn;
882
883         BUG_ON(dn->d_inode);
884
885         /* dn must be unhashed */
886         if (!d_unhashed(dn))
887                 d_drop(dn);
888         realdn = d_materialise_unique(dn, in);
889         if (IS_ERR(realdn)) {
890                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
891                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
892                 if (prehash)
893                         *prehash = false; /* don't rehash on error */
894                 dn = realdn; /* note realdn contains the error */
895                 goto out;
896         } else if (realdn) {
897                 dout("dn %p (%d) spliced with %p (%d) "
898                      "inode %p ino %llx.%llx\n",
899                      dn, dn->d_count,
900                      realdn, realdn->d_count,
901                      realdn->d_inode, ceph_vinop(realdn->d_inode));
902                 dput(dn);
903                 dn = realdn;
904         } else {
905                 BUG_ON(!ceph_dentry(dn));
906                 dout("dn %p attached to %p ino %llx.%llx\n",
907                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
908         }
909         if ((!prehash || *prehash) && d_unhashed(dn))
910                 d_rehash(dn);
911         if (set_offset)
912                 ceph_set_dentry_offset(dn);
913 out:
914         return dn;
915 }
916
917 /*
918  * Incorporate results into the local cache.  This is either just
919  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
920  * after a lookup).
921  *
922  * A reply may contain
923  *         a directory inode along with a dentry.
924  *  and/or a target inode
925  *
926  * Called with snap_rwsem (read).
927  */
928 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
929                     struct ceph_mds_session *session)
930 {
931         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
932         struct inode *in = NULL;
933         struct ceph_mds_reply_inode *ininfo;
934         struct ceph_vino vino;
935         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
936         int i = 0;
937         int err = 0;
938
939         dout("fill_trace %p is_dentry %d is_target %d\n", req,
940              rinfo->head->is_dentry, rinfo->head->is_target);
941
942 #if 0
943         /*
944          * Debugging hook:
945          *
946          * If we resend completed ops to a recovering mds, we get no
947          * trace.  Since that is very rare, pretend this is the case
948          * to ensure the 'no trace' handlers in the callers behave.
949          *
950          * Fill in inodes unconditionally to avoid breaking cap
951          * invariants.
952          */
953         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
954                 pr_info("fill_trace faking empty trace on %lld %s\n",
955                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
956                 if (rinfo->head->is_dentry) {
957                         rinfo->head->is_dentry = 0;
958                         err = fill_inode(req->r_locked_dir,
959                                          &rinfo->diri, rinfo->dirfrag,
960                                          session, req->r_request_started, -1);
961                 }
962                 if (rinfo->head->is_target) {
963                         rinfo->head->is_target = 0;
964                         ininfo = rinfo->targeti.in;
965                         vino.ino = le64_to_cpu(ininfo->ino);
966                         vino.snap = le64_to_cpu(ininfo->snapid);
967                         in = ceph_get_inode(sb, vino);
968                         err = fill_inode(in, &rinfo->targeti, NULL,
969                                          session, req->r_request_started,
970                                          req->r_fmode);
971                         iput(in);
972                 }
973         }
974 #endif
975
976         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
977                 dout("fill_trace reply is empty!\n");
978                 if (rinfo->head->result == 0 && req->r_locked_dir)
979                         ceph_invalidate_dir_request(req);
980                 return 0;
981         }
982
983         if (rinfo->head->is_dentry) {
984                 struct inode *dir = req->r_locked_dir;
985
986                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
987                                  session, req->r_request_started, -1,
988                                  &req->r_caps_reservation);
989                 if (err < 0)
990                         return err;
991         }
992
993         /*
994          * ignore null lease/binding on snapdir ENOENT, or else we
995          * will have trouble splicing in the virtual snapdir later
996          */
997         if (rinfo->head->is_dentry && !req->r_aborted &&
998             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
999                                                fsc->mount_options->snapdir_name,
1000                                                req->r_dentry->d_name.len))) {
1001                 /*
1002                  * lookup link rename   : null -> possibly existing inode
1003                  * mknod symlink mkdir  : null -> new inode
1004                  * unlink               : linked -> null
1005                  */
1006                 struct inode *dir = req->r_locked_dir;
1007                 struct dentry *dn = req->r_dentry;
1008                 bool have_dir_cap, have_lease;
1009
1010                 BUG_ON(!dn);
1011                 BUG_ON(!dir);
1012                 BUG_ON(dn->d_parent->d_inode != dir);
1013                 BUG_ON(ceph_ino(dir) !=
1014                        le64_to_cpu(rinfo->diri.in->ino));
1015                 BUG_ON(ceph_snap(dir) !=
1016                        le64_to_cpu(rinfo->diri.in->snapid));
1017
1018                 /* do we have a lease on the whole dir? */
1019                 have_dir_cap =
1020                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1021                          CEPH_CAP_FILE_SHARED);
1022
1023                 /* do we have a dn lease? */
1024                 have_lease = have_dir_cap ||
1025                         (le16_to_cpu(rinfo->dlease->mask) &
1026                          CEPH_LOCK_DN);
1027
1028                 if (!have_lease)
1029                         dout("fill_trace  no dentry lease or dir cap\n");
1030
1031                 /* rename? */
1032                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1033                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1034                              req->r_old_dentry,
1035                              req->r_old_dentry->d_name.len,
1036                              req->r_old_dentry->d_name.name,
1037                              dn, dn->d_name.len, dn->d_name.name);
1038                         dout("fill_trace doing d_move %p -> %p\n",
1039                              req->r_old_dentry, dn);
1040
1041                         d_move(req->r_old_dentry, dn);
1042                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1043                              req->r_old_dentry,
1044                              req->r_old_dentry->d_name.len,
1045                              req->r_old_dentry->d_name.name,
1046                              dn, dn->d_name.len, dn->d_name.name);
1047
1048                         /* ensure target dentry is invalidated, despite
1049                            rehashing bug in vfs_rename_dir */
1050                         ceph_invalidate_dentry_lease(dn);
1051
1052                         /*
1053                          * d_move() puts the renamed dentry at the end of
1054                          * d_subdirs.  We need to assign it an appropriate
1055                          * directory offset so we can behave when holding
1056                          * I_COMPLETE.
1057                          */
1058                         ceph_set_dentry_offset(req->r_old_dentry);
1059                         dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1060                              ceph_dentry(req->r_old_dentry)->offset);
1061
1062                         dn = req->r_old_dentry;  /* use old_dentry */
1063                         in = dn->d_inode;
1064                 }
1065
1066                 /* null dentry? */
1067                 if (!rinfo->head->is_target) {
1068                         dout("fill_trace null dentry\n");
1069                         if (dn->d_inode) {
1070                                 dout("d_delete %p\n", dn);
1071                                 d_delete(dn);
1072                         } else {
1073                                 dout("d_instantiate %p NULL\n", dn);
1074                                 d_instantiate(dn, NULL);
1075                                 if (have_lease && d_unhashed(dn))
1076                                         d_rehash(dn);
1077                                 update_dentry_lease(dn, rinfo->dlease,
1078                                                     session,
1079                                                     req->r_request_started);
1080                         }
1081                         goto done;
1082                 }
1083
1084                 /* attach proper inode */
1085                 ininfo = rinfo->targeti.in;
1086                 vino.ino = le64_to_cpu(ininfo->ino);
1087                 vino.snap = le64_to_cpu(ininfo->snapid);
1088                 in = dn->d_inode;
1089                 if (!in) {
1090                         in = ceph_get_inode(sb, vino);
1091                         if (IS_ERR(in)) {
1092                                 pr_err("fill_trace bad get_inode "
1093                                        "%llx.%llx\n", vino.ino, vino.snap);
1094                                 err = PTR_ERR(in);
1095                                 d_delete(dn);
1096                                 goto done;
1097                         }
1098                         dn = splice_dentry(dn, in, &have_lease, true);
1099                         if (IS_ERR(dn)) {
1100                                 err = PTR_ERR(dn);
1101                                 goto done;
1102                         }
1103                         req->r_dentry = dn;  /* may have spliced */
1104                         igrab(in);
1105                 } else if (ceph_ino(in) == vino.ino &&
1106                            ceph_snap(in) == vino.snap) {
1107                         igrab(in);
1108                 } else {
1109                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1110                              dn, in, ceph_ino(in), ceph_snap(in),
1111                              vino.ino, vino.snap);
1112                         have_lease = false;
1113                         in = NULL;
1114                 }
1115
1116                 if (have_lease)
1117                         update_dentry_lease(dn, rinfo->dlease, session,
1118                                             req->r_request_started);
1119                 dout(" final dn %p\n", dn);
1120                 i++;
1121         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1122                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1123                 struct dentry *dn = req->r_dentry;
1124
1125                 /* fill out a snapdir LOOKUPSNAP dentry */
1126                 BUG_ON(!dn);
1127                 BUG_ON(!req->r_locked_dir);
1128                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1129                 ininfo = rinfo->targeti.in;
1130                 vino.ino = le64_to_cpu(ininfo->ino);
1131                 vino.snap = le64_to_cpu(ininfo->snapid);
1132                 in = ceph_get_inode(sb, vino);
1133                 if (IS_ERR(in)) {
1134                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1135                                vino.ino, vino.snap);
1136                         err = PTR_ERR(in);
1137                         d_delete(dn);
1138                         goto done;
1139                 }
1140                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1141                 dn = splice_dentry(dn, in, NULL, true);
1142                 if (IS_ERR(dn)) {
1143                         err = PTR_ERR(dn);
1144                         goto done;
1145                 }
1146                 req->r_dentry = dn;  /* may have spliced */
1147                 igrab(in);
1148                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1149         }
1150
1151         if (rinfo->head->is_target) {
1152                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1153                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1154
1155                 if (in == NULL || ceph_ino(in) != vino.ino ||
1156                     ceph_snap(in) != vino.snap) {
1157                         in = ceph_get_inode(sb, vino);
1158                         if (IS_ERR(in)) {
1159                                 err = PTR_ERR(in);
1160                                 goto done;
1161                         }
1162                 }
1163                 req->r_target_inode = in;
1164
1165                 err = fill_inode(in,
1166                                  &rinfo->targeti, NULL,
1167                                  session, req->r_request_started,
1168                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1169                                  req->r_fmode : -1,
1170                                  &req->r_caps_reservation);
1171                 if (err < 0) {
1172                         pr_err("fill_inode badness %p %llx.%llx\n",
1173                                in, ceph_vinop(in));
1174                         goto done;
1175                 }
1176         }
1177
1178 done:
1179         dout("fill_trace done err=%d\n", err);
1180         return err;
1181 }
1182
1183 /*
1184  * Prepopulate our cache with readdir results, leases, etc.
1185  */
1186 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1187                              struct ceph_mds_session *session)
1188 {
1189         struct dentry *parent = req->r_dentry;
1190         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1191         struct qstr dname;
1192         struct dentry *dn;
1193         struct inode *in;
1194         int err = 0, i;
1195         struct inode *snapdir = NULL;
1196         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1197         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1198         struct ceph_dentry_info *di;
1199
1200         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1201                 snapdir = ceph_get_snapdir(parent->d_inode);
1202                 parent = d_find_alias(snapdir);
1203                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1204                      rinfo->dir_nr, parent);
1205         } else {
1206                 dout("readdir_prepopulate %d items under dn %p\n",
1207                      rinfo->dir_nr, parent);
1208                 if (rinfo->dir_dir)
1209                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1210         }
1211
1212         for (i = 0; i < rinfo->dir_nr; i++) {
1213                 struct ceph_vino vino;
1214
1215                 dname.name = rinfo->dir_dname[i];
1216                 dname.len = rinfo->dir_dname_len[i];
1217                 dname.hash = full_name_hash(dname.name, dname.len);
1218
1219                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1220                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1221
1222 retry_lookup:
1223                 dn = d_lookup(parent, &dname);
1224                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1225                      parent, dname.len, dname.name, dn);
1226
1227                 if (!dn) {
1228                         dn = d_alloc(parent, &dname);
1229                         dout("d_alloc %p '%.*s' = %p\n", parent,
1230                              dname.len, dname.name, dn);
1231                         if (dn == NULL) {
1232                                 dout("d_alloc badness\n");
1233                                 err = -ENOMEM;
1234                                 goto out;
1235                         }
1236                         err = ceph_init_dentry(dn);
1237                         if (err < 0) {
1238                                 dput(dn);
1239                                 goto out;
1240                         }
1241                 } else if (dn->d_inode &&
1242                            (ceph_ino(dn->d_inode) != vino.ino ||
1243                             ceph_snap(dn->d_inode) != vino.snap)) {
1244                         dout(" dn %p points to wrong inode %p\n",
1245                              dn, dn->d_inode);
1246                         d_delete(dn);
1247                         dput(dn);
1248                         goto retry_lookup;
1249                 } else {
1250                         /* reorder parent's d_subdirs */
1251                         spin_lock(&parent->d_lock);
1252                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1253                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1254                         spin_unlock(&dn->d_lock);
1255                         spin_unlock(&parent->d_lock);
1256                 }
1257
1258                 di = dn->d_fsdata;
1259                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1260
1261                 /* inode */
1262                 if (dn->d_inode) {
1263                         in = dn->d_inode;
1264                 } else {
1265                         in = ceph_get_inode(parent->d_sb, vino);
1266                         if (IS_ERR(in)) {
1267                                 dout("new_inode badness\n");
1268                                 d_delete(dn);
1269                                 dput(dn);
1270                                 err = PTR_ERR(in);
1271                                 goto out;
1272                         }
1273                         dn = splice_dentry(dn, in, NULL, false);
1274                         if (IS_ERR(dn))
1275                                 dn = NULL;
1276                 }
1277
1278                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1279                                req->r_request_started, -1,
1280                                &req->r_caps_reservation) < 0) {
1281                         pr_err("fill_inode badness on %p\n", in);
1282                         goto next_item;
1283                 }
1284                 if (dn)
1285                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1286                                             req->r_session,
1287                                             req->r_request_started);
1288 next_item:
1289                 if (dn)
1290                         dput(dn);
1291         }
1292         req->r_did_prepopulate = true;
1293
1294 out:
1295         if (snapdir) {
1296                 iput(snapdir);
1297                 dput(parent);
1298         }
1299         dout("readdir_prepopulate done\n");
1300         return err;
1301 }
1302
1303 int ceph_inode_set_size(struct inode *inode, loff_t size)
1304 {
1305         struct ceph_inode_info *ci = ceph_inode(inode);
1306         int ret = 0;
1307
1308         spin_lock(&inode->i_lock);
1309         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1310         inode->i_size = size;
1311         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1312
1313         /* tell the MDS if we are approaching max_size */
1314         if ((size << 1) >= ci->i_max_size &&
1315             (ci->i_reported_size << 1) < ci->i_max_size)
1316                 ret = 1;
1317
1318         spin_unlock(&inode->i_lock);
1319         return ret;
1320 }
1321
1322 /*
1323  * Write back inode data in a worker thread.  (This can't be done
1324  * in the message handler context.)
1325  */
1326 void ceph_queue_writeback(struct inode *inode)
1327 {
1328         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1329                        &ceph_inode(inode)->i_wb_work)) {
1330                 dout("ceph_queue_writeback %p\n", inode);
1331                 igrab(inode);
1332         } else {
1333                 dout("ceph_queue_writeback %p failed\n", inode);
1334         }
1335 }
1336
1337 static void ceph_writeback_work(struct work_struct *work)
1338 {
1339         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1340                                                   i_wb_work);
1341         struct inode *inode = &ci->vfs_inode;
1342
1343         dout("writeback %p\n", inode);
1344         filemap_fdatawrite(&inode->i_data);
1345         iput(inode);
1346 }
1347
1348 /*
1349  * queue an async invalidation
1350  */
1351 void ceph_queue_invalidate(struct inode *inode)
1352 {
1353         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1354                        &ceph_inode(inode)->i_pg_inv_work)) {
1355                 dout("ceph_queue_invalidate %p\n", inode);
1356                 igrab(inode);
1357         } else {
1358                 dout("ceph_queue_invalidate %p failed\n", inode);
1359         }
1360 }
1361
1362 /*
1363  * invalidate any pages that are not dirty or under writeback.  this
1364  * includes pages that are clean and mapped.
1365  */
1366 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1367 {
1368         struct pagevec pvec;
1369         pgoff_t next = 0;
1370         int i;
1371
1372         pagevec_init(&pvec, 0);
1373         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1374                 for (i = 0; i < pagevec_count(&pvec); i++) {
1375                         struct page *page = pvec.pages[i];
1376                         pgoff_t index;
1377                         int skip_page =
1378                                 (PageDirty(page) || PageWriteback(page));
1379
1380                         if (!skip_page)
1381                                 skip_page = !trylock_page(page);
1382
1383                         /*
1384                          * We really shouldn't be looking at the ->index of an
1385                          * unlocked page.  But we're not allowed to lock these
1386                          * pages.  So we rely upon nobody altering the ->index
1387                          * of this (pinned-by-us) page.
1388                          */
1389                         index = page->index;
1390                         if (index > next)
1391                                 next = index;
1392                         next++;
1393
1394                         if (skip_page)
1395                                 continue;
1396
1397                         generic_error_remove_page(mapping, page);
1398                         unlock_page(page);
1399                 }
1400                 pagevec_release(&pvec);
1401                 cond_resched();
1402         }
1403 }
1404
1405 /*
1406  * Invalidate inode pages in a worker thread.  (This can't be done
1407  * in the message handler context.)
1408  */
1409 static void ceph_invalidate_work(struct work_struct *work)
1410 {
1411         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1412                                                   i_pg_inv_work);
1413         struct inode *inode = &ci->vfs_inode;
1414         u32 orig_gen;
1415         int check = 0;
1416
1417         spin_lock(&inode->i_lock);
1418         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1419              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1420         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1421                 /* nevermind! */
1422                 spin_unlock(&inode->i_lock);
1423                 goto out;
1424         }
1425         orig_gen = ci->i_rdcache_gen;
1426         spin_unlock(&inode->i_lock);
1427
1428         ceph_invalidate_nondirty_pages(inode->i_mapping);
1429
1430         spin_lock(&inode->i_lock);
1431         if (orig_gen == ci->i_rdcache_gen &&
1432             orig_gen == ci->i_rdcache_revoking) {
1433                 dout("invalidate_pages %p gen %d successful\n", inode,
1434                      ci->i_rdcache_gen);
1435                 ci->i_rdcache_revoking--;
1436                 check = 1;
1437         } else {
1438                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1439                      inode, orig_gen, ci->i_rdcache_gen,
1440                      ci->i_rdcache_revoking);
1441         }
1442         spin_unlock(&inode->i_lock);
1443
1444         if (check)
1445                 ceph_check_caps(ci, 0, NULL);
1446 out:
1447         iput(inode);
1448 }
1449
1450
1451 /*
1452  * called by trunc_wq; take i_mutex ourselves
1453  *
1454  * We also truncate in a separate thread as well.
1455  */
1456 static void ceph_vmtruncate_work(struct work_struct *work)
1457 {
1458         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1459                                                   i_vmtruncate_work);
1460         struct inode *inode = &ci->vfs_inode;
1461
1462         dout("vmtruncate_work %p\n", inode);
1463         mutex_lock(&inode->i_mutex);
1464         __ceph_do_pending_vmtruncate(inode);
1465         mutex_unlock(&inode->i_mutex);
1466         iput(inode);
1467 }
1468
1469 /*
1470  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1471  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1472  */
1473 void ceph_queue_vmtruncate(struct inode *inode)
1474 {
1475         struct ceph_inode_info *ci = ceph_inode(inode);
1476
1477         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1478                        &ci->i_vmtruncate_work)) {
1479                 dout("ceph_queue_vmtruncate %p\n", inode);
1480                 igrab(inode);
1481         } else {
1482                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1483                      inode, ci->i_truncate_pending);
1484         }
1485 }
1486
1487 /*
1488  * called with i_mutex held.
1489  *
1490  * Make sure any pending truncation is applied before doing anything
1491  * that may depend on it.
1492  */
1493 void __ceph_do_pending_vmtruncate(struct inode *inode)
1494 {
1495         struct ceph_inode_info *ci = ceph_inode(inode);
1496         u64 to;
1497         int wrbuffer_refs, wake = 0;
1498
1499 retry:
1500         spin_lock(&inode->i_lock);
1501         if (ci->i_truncate_pending == 0) {
1502                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1503                 spin_unlock(&inode->i_lock);
1504                 return;
1505         }
1506
1507         /*
1508          * make sure any dirty snapped pages are flushed before we
1509          * possibly truncate them.. so write AND block!
1510          */
1511         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1512                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1513                      inode);
1514                 spin_unlock(&inode->i_lock);
1515                 filemap_write_and_wait_range(&inode->i_data, 0,
1516                                              inode->i_sb->s_maxbytes);
1517                 goto retry;
1518         }
1519
1520         to = ci->i_truncate_size;
1521         wrbuffer_refs = ci->i_wrbuffer_ref;
1522         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1523              ci->i_truncate_pending, to);
1524         spin_unlock(&inode->i_lock);
1525
1526         truncate_inode_pages(inode->i_mapping, to);
1527
1528         spin_lock(&inode->i_lock);
1529         ci->i_truncate_pending--;
1530         if (ci->i_truncate_pending == 0)
1531                 wake = 1;
1532         spin_unlock(&inode->i_lock);
1533
1534         if (wrbuffer_refs == 0)
1535                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1536         if (wake)
1537                 wake_up_all(&ci->i_cap_wq);
1538 }
1539
1540
1541 /*
1542  * symlinks
1543  */
1544 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1545 {
1546         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1547         nd_set_link(nd, ci->i_symlink);
1548         return NULL;
1549 }
1550
1551 static const struct inode_operations ceph_symlink_iops = {
1552         .readlink = generic_readlink,
1553         .follow_link = ceph_sym_follow_link,
1554 };
1555
1556 /*
1557  * setattr
1558  */
1559 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1560 {
1561         struct inode *inode = dentry->d_inode;
1562         struct ceph_inode_info *ci = ceph_inode(inode);
1563         struct inode *parent_inode = dentry->d_parent->d_inode;
1564         const unsigned int ia_valid = attr->ia_valid;
1565         struct ceph_mds_request *req;
1566         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1567         int issued;
1568         int release = 0, dirtied = 0;
1569         int mask = 0;
1570         int err = 0;
1571         int inode_dirty_flags = 0;
1572
1573         if (ceph_snap(inode) != CEPH_NOSNAP)
1574                 return -EROFS;
1575
1576         __ceph_do_pending_vmtruncate(inode);
1577
1578         err = inode_change_ok(inode, attr);
1579         if (err != 0)
1580                 return err;
1581
1582         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1583                                        USE_AUTH_MDS);
1584         if (IS_ERR(req))
1585                 return PTR_ERR(req);
1586
1587         spin_lock(&inode->i_lock);
1588         issued = __ceph_caps_issued(ci, NULL);
1589         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1590
1591         if (ia_valid & ATTR_UID) {
1592                 dout("setattr %p uid %d -> %d\n", inode,
1593                      inode->i_uid, attr->ia_uid);
1594                 if (issued & CEPH_CAP_AUTH_EXCL) {
1595                         inode->i_uid = attr->ia_uid;
1596                         dirtied |= CEPH_CAP_AUTH_EXCL;
1597                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1598                            attr->ia_uid != inode->i_uid) {
1599                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1600                         mask |= CEPH_SETATTR_UID;
1601                         release |= CEPH_CAP_AUTH_SHARED;
1602                 }
1603         }
1604         if (ia_valid & ATTR_GID) {
1605                 dout("setattr %p gid %d -> %d\n", inode,
1606                      inode->i_gid, attr->ia_gid);
1607                 if (issued & CEPH_CAP_AUTH_EXCL) {
1608                         inode->i_gid = attr->ia_gid;
1609                         dirtied |= CEPH_CAP_AUTH_EXCL;
1610                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1611                            attr->ia_gid != inode->i_gid) {
1612                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1613                         mask |= CEPH_SETATTR_GID;
1614                         release |= CEPH_CAP_AUTH_SHARED;
1615                 }
1616         }
1617         if (ia_valid & ATTR_MODE) {
1618                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1619                      attr->ia_mode);
1620                 if (issued & CEPH_CAP_AUTH_EXCL) {
1621                         inode->i_mode = attr->ia_mode;
1622                         dirtied |= CEPH_CAP_AUTH_EXCL;
1623                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1624                            attr->ia_mode != inode->i_mode) {
1625                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1626                         mask |= CEPH_SETATTR_MODE;
1627                         release |= CEPH_CAP_AUTH_SHARED;
1628                 }
1629         }
1630
1631         if (ia_valid & ATTR_ATIME) {
1632                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1633                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1634                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1635                 if (issued & CEPH_CAP_FILE_EXCL) {
1636                         ci->i_time_warp_seq++;
1637                         inode->i_atime = attr->ia_atime;
1638                         dirtied |= CEPH_CAP_FILE_EXCL;
1639                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1640                            timespec_compare(&inode->i_atime,
1641                                             &attr->ia_atime) < 0) {
1642                         inode->i_atime = attr->ia_atime;
1643                         dirtied |= CEPH_CAP_FILE_WR;
1644                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1645                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1646                         ceph_encode_timespec(&req->r_args.setattr.atime,
1647                                              &attr->ia_atime);
1648                         mask |= CEPH_SETATTR_ATIME;
1649                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1650                                 CEPH_CAP_FILE_WR;
1651                 }
1652         }
1653         if (ia_valid & ATTR_MTIME) {
1654                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1655                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1656                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1657                 if (issued & CEPH_CAP_FILE_EXCL) {
1658                         ci->i_time_warp_seq++;
1659                         inode->i_mtime = attr->ia_mtime;
1660                         dirtied |= CEPH_CAP_FILE_EXCL;
1661                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1662                            timespec_compare(&inode->i_mtime,
1663                                             &attr->ia_mtime) < 0) {
1664                         inode->i_mtime = attr->ia_mtime;
1665                         dirtied |= CEPH_CAP_FILE_WR;
1666                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1667                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1668                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1669                                              &attr->ia_mtime);
1670                         mask |= CEPH_SETATTR_MTIME;
1671                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1672                                 CEPH_CAP_FILE_WR;
1673                 }
1674         }
1675         if (ia_valid & ATTR_SIZE) {
1676                 dout("setattr %p size %lld -> %lld\n", inode,
1677                      inode->i_size, attr->ia_size);
1678                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1679                         err = -EINVAL;
1680                         goto out;
1681                 }
1682                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1683                     attr->ia_size > inode->i_size) {
1684                         inode->i_size = attr->ia_size;
1685                         inode->i_blocks =
1686                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1687                         inode->i_ctime = attr->ia_ctime;
1688                         ci->i_reported_size = attr->ia_size;
1689                         dirtied |= CEPH_CAP_FILE_EXCL;
1690                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1691                            attr->ia_size != inode->i_size) {
1692                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1693                         req->r_args.setattr.old_size =
1694                                 cpu_to_le64(inode->i_size);
1695                         mask |= CEPH_SETATTR_SIZE;
1696                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1697                                 CEPH_CAP_FILE_WR;
1698                 }
1699         }
1700
1701         /* these do nothing */
1702         if (ia_valid & ATTR_CTIME) {
1703                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1704                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1705                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1706                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1707                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1708                      only ? "ctime only" : "ignored");
1709                 inode->i_ctime = attr->ia_ctime;
1710                 if (only) {
1711                         /*
1712                          * if kernel wants to dirty ctime but nothing else,
1713                          * we need to choose a cap to dirty under, or do
1714                          * a almost-no-op setattr
1715                          */
1716                         if (issued & CEPH_CAP_AUTH_EXCL)
1717                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1718                         else if (issued & CEPH_CAP_FILE_EXCL)
1719                                 dirtied |= CEPH_CAP_FILE_EXCL;
1720                         else if (issued & CEPH_CAP_XATTR_EXCL)
1721                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1722                         else
1723                                 mask |= CEPH_SETATTR_CTIME;
1724                 }
1725         }
1726         if (ia_valid & ATTR_FILE)
1727                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1728
1729         if (dirtied) {
1730                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1731                 inode->i_ctime = CURRENT_TIME;
1732         }
1733
1734         release &= issued;
1735         spin_unlock(&inode->i_lock);
1736
1737         if (inode_dirty_flags)
1738                 __mark_inode_dirty(inode, inode_dirty_flags);
1739
1740         if (mask) {
1741                 req->r_inode = igrab(inode);
1742                 req->r_inode_drop = release;
1743                 req->r_args.setattr.mask = cpu_to_le32(mask);
1744                 req->r_num_caps = 1;
1745                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1746         }
1747         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1748              ceph_cap_string(dirtied), mask);
1749
1750         ceph_mdsc_put_request(req);
1751         __ceph_do_pending_vmtruncate(inode);
1752         return err;
1753 out:
1754         spin_unlock(&inode->i_lock);
1755         ceph_mdsc_put_request(req);
1756         return err;
1757 }
1758
1759 /*
1760  * Verify that we have a lease on the given mask.  If not,
1761  * do a getattr against an mds.
1762  */
1763 int ceph_do_getattr(struct inode *inode, int mask)
1764 {
1765         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1766         struct ceph_mds_client *mdsc = fsc->mdsc;
1767         struct ceph_mds_request *req;
1768         int err;
1769
1770         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1771                 dout("do_getattr inode %p SNAPDIR\n", inode);
1772                 return 0;
1773         }
1774
1775         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1776         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1777                 return 0;
1778
1779         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1780         if (IS_ERR(req))
1781                 return PTR_ERR(req);
1782         req->r_inode = igrab(inode);
1783         req->r_num_caps = 1;
1784         req->r_args.getattr.mask = cpu_to_le32(mask);
1785         err = ceph_mdsc_do_request(mdsc, NULL, req);
1786         ceph_mdsc_put_request(req);
1787         dout("do_getattr result=%d\n", err);
1788         return err;
1789 }
1790
1791
1792 /*
1793  * Check inode permissions.  We verify we have a valid value for
1794  * the AUTH cap, then call the generic handler.
1795  */
1796 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1797 {
1798         int err;
1799
1800         if (flags & IPERM_FLAG_RCU)
1801                 return -ECHILD;
1802
1803         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1804
1805         if (!err)
1806                 err = generic_permission(inode, mask, flags, NULL);
1807         return err;
1808 }
1809
1810 /*
1811  * Get all attributes.  Hopefully somedata we'll have a statlite()
1812  * and can limit the fields we require to be accurate.
1813  */
1814 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1815                  struct kstat *stat)
1816 {
1817         struct inode *inode = dentry->d_inode;
1818         struct ceph_inode_info *ci = ceph_inode(inode);
1819         int err;
1820
1821         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1822         if (!err) {
1823                 generic_fillattr(inode, stat);
1824                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1825                 if (ceph_snap(inode) != CEPH_NOSNAP)
1826                         stat->dev = ceph_snap(inode);
1827                 else
1828                         stat->dev = 0;
1829                 if (S_ISDIR(inode->i_mode)) {
1830                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1831                                                 RBYTES))
1832                                 stat->size = ci->i_rbytes;
1833                         else
1834                                 stat->size = ci->i_files + ci->i_subdirs;
1835                         stat->blocks = 0;
1836                         stat->blksize = 65536;
1837                 }
1838         }
1839         return err;
1840 }