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TOMOYO Linux Cross Reference
Linux/fs/ceph/inode.c

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  1 #include <linux/ceph/ceph_debug.h>
  2 
  3 #include <linux/module.h>
  4 #include <linux/fs.h>
  5 #include <linux/slab.h>
  6 #include <linux/string.h>
  7 #include <linux/uaccess.h>
  8 #include <linux/kernel.h>
  9 #include <linux/namei.h>
 10 #include <linux/writeback.h>
 11 #include <linux/vmalloc.h>
 12 
 13 #include "super.h"
 14 #include "mds_client.h"
 15 #include <linux/ceph/decode.h>
 16 
 17 /*
 18  * Ceph inode operations
 19  *
 20  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
 21  * setattr, etc.), xattr helpers, and helpers for assimilating
 22  * metadata returned by the MDS into our cache.
 23  *
 24  * Also define helpers for doing asynchronous writeback, invalidation,
 25  * and truncation for the benefit of those who can't afford to block
 26  * (typically because they are in the message handler path).
 27  */
 28 
 29 static const struct inode_operations ceph_symlink_iops;
 30 
 31 static void ceph_invalidate_work(struct work_struct *work);
 32 static void ceph_writeback_work(struct work_struct *work);
 33 static void ceph_vmtruncate_work(struct work_struct *work);
 34 
 35 /*
 36  * find or create an inode, given the ceph ino number
 37  */
 38 static int ceph_set_ino_cb(struct inode *inode, void *data)
 39 {
 40         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
 41         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
 42         return 0;
 43 }
 44 
 45 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
 46 {
 47         struct inode *inode;
 48         ino_t t = ceph_vino_to_ino(vino);
 49 
 50         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
 51         if (inode == NULL)
 52                 return ERR_PTR(-ENOMEM);
 53         if (inode->i_state & I_NEW) {
 54                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
 55                      inode, ceph_vinop(inode), (u64)inode->i_ino);
 56                 unlock_new_inode(inode);
 57         }
 58 
 59         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
 60              vino.snap, inode);
 61         return inode;
 62 }
 63 
 64 /*
 65  * get/constuct snapdir inode for a given directory
 66  */
 67 struct inode *ceph_get_snapdir(struct inode *parent)
 68 {
 69         struct ceph_vino vino = {
 70                 .ino = ceph_ino(parent),
 71                 .snap = CEPH_SNAPDIR,
 72         };
 73         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
 74         struct ceph_inode_info *ci = ceph_inode(inode);
 75 
 76         BUG_ON(!S_ISDIR(parent->i_mode));
 77         if (IS_ERR(inode))
 78                 return inode;
 79         inode->i_mode = parent->i_mode;
 80         inode->i_uid = parent->i_uid;
 81         inode->i_gid = parent->i_gid;
 82         inode->i_op = &ceph_dir_iops;
 83         inode->i_fop = &ceph_dir_fops;
 84         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 85         ci->i_rbytes = 0;
 86         return inode;
 87 }
 88 
 89 const struct inode_operations ceph_file_iops = {
 90         .permission = ceph_permission,
 91         .setattr = ceph_setattr,
 92         .getattr = ceph_getattr,
 93         .setxattr = ceph_setxattr,
 94         .getxattr = ceph_getxattr,
 95         .listxattr = ceph_listxattr,
 96         .removexattr = ceph_removexattr,
 97 };
 98 
 99 
100 /*
101  * We use a 'frag tree' to keep track of the MDS's directory fragments
102  * for a given inode (usually there is just a single fragment).  We
103  * need to know when a child frag is delegated to a new MDS, or when
104  * it is flagged as replicated, so we can direct our requests
105  * accordingly.
106  */
107 
108 /*
109  * find/create a frag in the tree
110  */
111 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
112                                                     u32 f)
113 {
114         struct rb_node **p;
115         struct rb_node *parent = NULL;
116         struct ceph_inode_frag *frag;
117         int c;
118 
119         p = &ci->i_fragtree.rb_node;
120         while (*p) {
121                 parent = *p;
122                 frag = rb_entry(parent, struct ceph_inode_frag, node);
123                 c = ceph_frag_compare(f, frag->frag);
124                 if (c < 0)
125                         p = &(*p)->rb_left;
126                 else if (c > 0)
127                         p = &(*p)->rb_right;
128                 else
129                         return frag;
130         }
131 
132         frag = kmalloc(sizeof(*frag), GFP_NOFS);
133         if (!frag) {
134                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
135                        "frag %x\n", &ci->vfs_inode,
136                        ceph_vinop(&ci->vfs_inode), f);
137                 return ERR_PTR(-ENOMEM);
138         }
139         frag->frag = f;
140         frag->split_by = 0;
141         frag->mds = -1;
142         frag->ndist = 0;
143 
144         rb_link_node(&frag->node, parent, p);
145         rb_insert_color(&frag->node, &ci->i_fragtree);
146 
147         dout("get_or_create_frag added %llx.%llx frag %x\n",
148              ceph_vinop(&ci->vfs_inode), f);
149         return frag;
150 }
151 
152 /*
153  * find a specific frag @f
154  */
155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
156 {
157         struct rb_node *n = ci->i_fragtree.rb_node;
158 
159         while (n) {
160                 struct ceph_inode_frag *frag =
161                         rb_entry(n, struct ceph_inode_frag, node);
162                 int c = ceph_frag_compare(f, frag->frag);
163                 if (c < 0)
164                         n = n->rb_left;
165                 else if (c > 0)
166                         n = n->rb_right;
167                 else
168                         return frag;
169         }
170         return NULL;
171 }
172 
173 /*
174  * Choose frag containing the given value @v.  If @pfrag is
175  * specified, copy the frag delegation info to the caller if
176  * it is present.
177  */
178 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
179                      struct ceph_inode_frag *pfrag,
180                      int *found)
181 {
182         u32 t = ceph_frag_make(0, 0);
183         struct ceph_inode_frag *frag;
184         unsigned nway, i;
185         u32 n;
186 
187         if (found)
188                 *found = 0;
189 
190         mutex_lock(&ci->i_fragtree_mutex);
191         while (1) {
192                 WARN_ON(!ceph_frag_contains_value(t, v));
193                 frag = __ceph_find_frag(ci, t);
194                 if (!frag)
195                         break; /* t is a leaf */
196                 if (frag->split_by == 0) {
197                         if (pfrag)
198                                 memcpy(pfrag, frag, sizeof(*pfrag));
199                         if (found)
200                                 *found = 1;
201                         break;
202                 }
203 
204                 /* choose child */
205                 nway = 1 << frag->split_by;
206                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
207                      frag->split_by, nway);
208                 for (i = 0; i < nway; i++) {
209                         n = ceph_frag_make_child(t, frag->split_by, i);
210                         if (ceph_frag_contains_value(n, v)) {
211                                 t = n;
212                                 break;
213                         }
214                 }
215                 BUG_ON(i == nway);
216         }
217         dout("choose_frag(%x) = %x\n", v, t);
218 
219         mutex_unlock(&ci->i_fragtree_mutex);
220         return t;
221 }
222 
223 /*
224  * Process dirfrag (delegation) info from the mds.  Include leaf
225  * fragment in tree ONLY if ndist > 0.  Otherwise, only
226  * branches/splits are included in i_fragtree)
227  */
228 static int ceph_fill_dirfrag(struct inode *inode,
229                              struct ceph_mds_reply_dirfrag *dirinfo)
230 {
231         struct ceph_inode_info *ci = ceph_inode(inode);
232         struct ceph_inode_frag *frag;
233         u32 id = le32_to_cpu(dirinfo->frag);
234         int mds = le32_to_cpu(dirinfo->auth);
235         int ndist = le32_to_cpu(dirinfo->ndist);
236         int i;
237         int err = 0;
238 
239         mutex_lock(&ci->i_fragtree_mutex);
240         if (ndist == 0) {
241                 /* no delegation info needed. */
242                 frag = __ceph_find_frag(ci, id);
243                 if (!frag)
244                         goto out;
245                 if (frag->split_by == 0) {
246                         /* tree leaf, remove */
247                         dout("fill_dirfrag removed %llx.%llx frag %x"
248                              " (no ref)\n", ceph_vinop(inode), id);
249                         rb_erase(&frag->node, &ci->i_fragtree);
250                         kfree(frag);
251                 } else {
252                         /* tree branch, keep and clear */
253                         dout("fill_dirfrag cleared %llx.%llx frag %x"
254                              " referral\n", ceph_vinop(inode), id);
255                         frag->mds = -1;
256                         frag->ndist = 0;
257                 }
258                 goto out;
259         }
260 
261 
262         /* find/add this frag to store mds delegation info */
263         frag = __get_or_create_frag(ci, id);
264         if (IS_ERR(frag)) {
265                 /* this is not the end of the world; we can continue
266                    with bad/inaccurate delegation info */
267                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
268                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
269                 err = -ENOMEM;
270                 goto out;
271         }
272 
273         frag->mds = mds;
274         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
275         for (i = 0; i < frag->ndist; i++)
276                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
277         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
278              ceph_vinop(inode), frag->frag, frag->ndist);
279 
280 out:
281         mutex_unlock(&ci->i_fragtree_mutex);
282         return err;
283 }
284 
285 
286 /*
287  * initialize a newly allocated inode.
288  */
289 struct inode *ceph_alloc_inode(struct super_block *sb)
290 {
291         struct ceph_inode_info *ci;
292         int i;
293 
294         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
295         if (!ci)
296                 return NULL;
297 
298         dout("alloc_inode %p\n", &ci->vfs_inode);
299 
300         spin_lock_init(&ci->i_ceph_lock);
301 
302         ci->i_version = 0;
303         ci->i_time_warp_seq = 0;
304         ci->i_ceph_flags = 0;
305         ci->i_release_count = 0;
306         ci->i_symlink = NULL;
307 
308         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
309 
310         ci->i_fragtree = RB_ROOT;
311         mutex_init(&ci->i_fragtree_mutex);
312 
313         ci->i_xattrs.blob = NULL;
314         ci->i_xattrs.prealloc_blob = NULL;
315         ci->i_xattrs.dirty = false;
316         ci->i_xattrs.index = RB_ROOT;
317         ci->i_xattrs.count = 0;
318         ci->i_xattrs.names_size = 0;
319         ci->i_xattrs.vals_size = 0;
320         ci->i_xattrs.version = 0;
321         ci->i_xattrs.index_version = 0;
322 
323         ci->i_caps = RB_ROOT;
324         ci->i_auth_cap = NULL;
325         ci->i_dirty_caps = 0;
326         ci->i_flushing_caps = 0;
327         INIT_LIST_HEAD(&ci->i_dirty_item);
328         INIT_LIST_HEAD(&ci->i_flushing_item);
329         ci->i_cap_flush_seq = 0;
330         ci->i_cap_flush_last_tid = 0;
331         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
332         init_waitqueue_head(&ci->i_cap_wq);
333         ci->i_hold_caps_min = 0;
334         ci->i_hold_caps_max = 0;
335         INIT_LIST_HEAD(&ci->i_cap_delay_list);
336         ci->i_cap_exporting_mds = 0;
337         ci->i_cap_exporting_mseq = 0;
338         ci->i_cap_exporting_issued = 0;
339         INIT_LIST_HEAD(&ci->i_cap_snaps);
340         ci->i_head_snapc = NULL;
341         ci->i_snap_caps = 0;
342 
343         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
344                 ci->i_nr_by_mode[i] = 0;
345 
346         ci->i_truncate_seq = 0;
347         ci->i_truncate_size = 0;
348         ci->i_truncate_pending = 0;
349 
350         ci->i_max_size = 0;
351         ci->i_reported_size = 0;
352         ci->i_wanted_max_size = 0;
353         ci->i_requested_max_size = 0;
354 
355         ci->i_pin_ref = 0;
356         ci->i_rd_ref = 0;
357         ci->i_rdcache_ref = 0;
358         ci->i_wr_ref = 0;
359         ci->i_wb_ref = 0;
360         ci->i_wrbuffer_ref = 0;
361         ci->i_wrbuffer_ref_head = 0;
362         ci->i_shared_gen = 0;
363         ci->i_rdcache_gen = 0;
364         ci->i_rdcache_revoking = 0;
365 
366         INIT_LIST_HEAD(&ci->i_unsafe_writes);
367         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
368         spin_lock_init(&ci->i_unsafe_lock);
369 
370         ci->i_snap_realm = NULL;
371         INIT_LIST_HEAD(&ci->i_snap_realm_item);
372         INIT_LIST_HEAD(&ci->i_snap_flush_item);
373 
374         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
375         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
376 
377         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
378 
379         return &ci->vfs_inode;
380 }
381 
382 static void ceph_i_callback(struct rcu_head *head)
383 {
384         struct inode *inode = container_of(head, struct inode, i_rcu);
385         struct ceph_inode_info *ci = ceph_inode(inode);
386 
387         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 = 0, implemented;
564         int updating_inode = 0;
565         struct timespec mtime, atime, ctime;
566         u32 nsplits;
567         struct ceph_buffer *xattr_blob = NULL;
568         int err = 0;
569         int queue_trunc = 0;
570 
571         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
572              inode, ceph_vinop(inode), le64_to_cpu(info->version),
573              ci->i_version);
574 
575         /*
576          * prealloc xattr data, if it looks like we'll need it.  only
577          * if len > 4 (meaning there are actually xattrs; the first 4
578          * bytes are the xattr count).
579          */
580         if (iinfo->xattr_len > 4) {
581                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
582                 if (!xattr_blob)
583                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
584                                iinfo->xattr_len);
585         }
586 
587         spin_lock(&ci->i_ceph_lock);
588 
589         /*
590          * provided version will be odd if inode value is projected,
591          * even if stable.  skip the update if we have newer stable
592          * info (ours>=theirs, e.g. due to racing mds replies), unless
593          * we are getting projected (unstable) info (in which case the
594          * version is odd, and we want ours>theirs).
595          *   us   them
596          *   2    2     skip
597          *   3    2     skip
598          *   3    3     update
599          */
600         if (le64_to_cpu(info->version) > 0 &&
601             (ci->i_version & ~1) >= le64_to_cpu(info->version))
602                 goto no_change;
603         
604         updating_inode = 1;
605         issued = __ceph_caps_issued(ci, &implemented);
606         issued |= implemented | __ceph_caps_dirty(ci);
607 
608         /* update inode */
609         ci->i_version = le64_to_cpu(info->version);
610         inode->i_version++;
611         inode->i_rdev = le32_to_cpu(info->rdev);
612 
613         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
614                 inode->i_mode = le32_to_cpu(info->mode);
615                 inode->i_uid = le32_to_cpu(info->uid);
616                 inode->i_gid = le32_to_cpu(info->gid);
617                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
618                      inode->i_uid, inode->i_gid);
619         }
620 
621         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
622                 set_nlink(inode, le32_to_cpu(info->nlink));
623 
624         /* be careful with mtime, atime, size */
625         ceph_decode_timespec(&atime, &info->atime);
626         ceph_decode_timespec(&mtime, &info->mtime);
627         ceph_decode_timespec(&ctime, &info->ctime);
628         queue_trunc = ceph_fill_file_size(inode, issued,
629                                           le32_to_cpu(info->truncate_seq),
630                                           le64_to_cpu(info->truncate_size),
631                                           le64_to_cpu(info->size));
632         ceph_fill_file_time(inode, issued,
633                             le32_to_cpu(info->time_warp_seq),
634                             &ctime, &mtime, &atime);
635 
636         /* only update max_size on auth cap */
637         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
638             ci->i_max_size != le64_to_cpu(info->max_size)) {
639                 dout("max_size %lld -> %llu\n", ci->i_max_size,
640                      le64_to_cpu(info->max_size));
641                 ci->i_max_size = le64_to_cpu(info->max_size);
642         }
643 
644         ci->i_layout = info->layout;
645         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
646 
647         /* xattrs */
648         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
649         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
650             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
651                 if (ci->i_xattrs.blob)
652                         ceph_buffer_put(ci->i_xattrs.blob);
653                 ci->i_xattrs.blob = xattr_blob;
654                 if (xattr_blob)
655                         memcpy(ci->i_xattrs.blob->vec.iov_base,
656                                iinfo->xattr_data, iinfo->xattr_len);
657                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
658                 xattr_blob = NULL;
659         }
660 
661         inode->i_mapping->a_ops = &ceph_aops;
662         inode->i_mapping->backing_dev_info =
663                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
664 
665         switch (inode->i_mode & S_IFMT) {
666         case S_IFIFO:
667         case S_IFBLK:
668         case S_IFCHR:
669         case S_IFSOCK:
670                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
671                 inode->i_op = &ceph_file_iops;
672                 break;
673         case S_IFREG:
674                 inode->i_op = &ceph_file_iops;
675                 inode->i_fop = &ceph_file_fops;
676                 break;
677         case S_IFLNK:
678                 inode->i_op = &ceph_symlink_iops;
679                 if (!ci->i_symlink) {
680                         u32 symlen = iinfo->symlink_len;
681                         char *sym;
682 
683                         spin_unlock(&ci->i_ceph_lock);
684 
685                         err = -EINVAL;
686                         if (WARN_ON(symlen != inode->i_size))
687                                 goto out;
688 
689                         err = -ENOMEM;
690                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
691                         if (!sym)
692                                 goto out;
693 
694                         spin_lock(&ci->i_ceph_lock);
695                         if (!ci->i_symlink)
696                                 ci->i_symlink = sym;
697                         else
698                                 kfree(sym); /* lost a race */
699                 }
700                 break;
701         case S_IFDIR:
702                 inode->i_op = &ceph_dir_iops;
703                 inode->i_fop = &ceph_dir_fops;
704 
705                 ci->i_dir_layout = iinfo->dir_layout;
706 
707                 ci->i_files = le64_to_cpu(info->files);
708                 ci->i_subdirs = le64_to_cpu(info->subdirs);
709                 ci->i_rbytes = le64_to_cpu(info->rbytes);
710                 ci->i_rfiles = le64_to_cpu(info->rfiles);
711                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
712                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
713                 break;
714         default:
715                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
716                        ceph_vinop(inode), inode->i_mode);
717         }
718 
719 no_change:
720         spin_unlock(&ci->i_ceph_lock);
721 
722         /* queue truncate if we saw i_size decrease */
723         if (queue_trunc)
724                 ceph_queue_vmtruncate(inode);
725 
726         /* populate frag tree */
727         /* FIXME: move me up, if/when version reflects fragtree changes */
728         nsplits = le32_to_cpu(info->fragtree.nsplits);
729         mutex_lock(&ci->i_fragtree_mutex);
730         for (i = 0; i < nsplits; i++) {
731                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
732                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
733 
734                 if (IS_ERR(frag))
735                         continue;
736                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
737                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
738         }
739         mutex_unlock(&ci->i_fragtree_mutex);
740 
741         /* were we issued a capability? */
742         if (info->cap.caps) {
743                 if (ceph_snap(inode) == CEPH_NOSNAP) {
744                         ceph_add_cap(inode, session,
745                                      le64_to_cpu(info->cap.cap_id),
746                                      cap_fmode,
747                                      le32_to_cpu(info->cap.caps),
748                                      le32_to_cpu(info->cap.wanted),
749                                      le32_to_cpu(info->cap.seq),
750                                      le32_to_cpu(info->cap.mseq),
751                                      le64_to_cpu(info->cap.realm),
752                                      info->cap.flags,
753                                      caps_reservation);
754                 } else {
755                         spin_lock(&ci->i_ceph_lock);
756                         dout(" %p got snap_caps %s\n", inode,
757                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
758                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
759                         if (cap_fmode >= 0)
760                                 __ceph_get_fmode(ci, cap_fmode);
761                         spin_unlock(&ci->i_ceph_lock);
762                 }
763         } else if (cap_fmode >= 0) {
764                 pr_warning("mds issued no caps on %llx.%llx\n",
765                            ceph_vinop(inode));
766                 __ceph_get_fmode(ci, cap_fmode);
767         }
768 
769         /* set dir completion flag? */
770         if (S_ISDIR(inode->i_mode) &&
771             updating_inode &&                 /* didn't jump to no_change */
772             ci->i_files == 0 && ci->i_subdirs == 0 &&
773             ceph_snap(inode) == CEPH_NOSNAP &&
774             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
775             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
776             !ceph_dir_test_complete(inode)) {
777                 dout(" marking %p complete (empty)\n", inode);
778                 ceph_dir_set_complete(inode);
779                 ci->i_max_offset = 2;
780         }
781 
782         /* update delegation info? */
783         if (dirinfo)
784                 ceph_fill_dirfrag(inode, dirinfo);
785 
786         err = 0;
787 
788 out:
789         if (xattr_blob)
790                 ceph_buffer_put(xattr_blob);
791         return err;
792 }
793 
794 /*
795  * caller should hold session s_mutex.
796  */
797 static void update_dentry_lease(struct dentry *dentry,
798                                 struct ceph_mds_reply_lease *lease,
799                                 struct ceph_mds_session *session,
800                                 unsigned long from_time)
801 {
802         struct ceph_dentry_info *di = ceph_dentry(dentry);
803         long unsigned duration = le32_to_cpu(lease->duration_ms);
804         long unsigned ttl = from_time + (duration * HZ) / 1000;
805         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
806         struct inode *dir;
807 
808         /* only track leases on regular dentries */
809         if (dentry->d_op != &ceph_dentry_ops)
810                 return;
811 
812         spin_lock(&dentry->d_lock);
813         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
814              dentry, duration, ttl);
815 
816         /* make lease_rdcache_gen match directory */
817         dir = dentry->d_parent->d_inode;
818         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
819 
820         if (duration == 0)
821                 goto out_unlock;
822 
823         if (di->lease_gen == session->s_cap_gen &&
824             time_before(ttl, dentry->d_time))
825                 goto out_unlock;  /* we already have a newer lease. */
826 
827         if (di->lease_session && di->lease_session != session)
828                 goto out_unlock;
829 
830         ceph_dentry_lru_touch(dentry);
831 
832         if (!di->lease_session)
833                 di->lease_session = ceph_get_mds_session(session);
834         di->lease_gen = session->s_cap_gen;
835         di->lease_seq = le32_to_cpu(lease->seq);
836         di->lease_renew_after = half_ttl;
837         di->lease_renew_from = 0;
838         dentry->d_time = ttl;
839 out_unlock:
840         spin_unlock(&dentry->d_lock);
841         return;
842 }
843 
844 /*
845  * Set dentry's directory position based on the current dir's max, and
846  * order it in d_subdirs, so that dcache_readdir behaves.
847  *
848  * Always called under directory's i_mutex.
849  */
850 static void ceph_set_dentry_offset(struct dentry *dn)
851 {
852         struct dentry *dir = dn->d_parent;
853         struct inode *inode = dir->d_inode;
854         struct ceph_inode_info *ci;
855         struct ceph_dentry_info *di;
856 
857         BUG_ON(!inode);
858 
859         ci = ceph_inode(inode);
860         di = ceph_dentry(dn);
861 
862         spin_lock(&ci->i_ceph_lock);
863         if (!ceph_dir_test_complete(inode)) {
864                 spin_unlock(&ci->i_ceph_lock);
865                 return;
866         }
867         di->offset = ceph_inode(inode)->i_max_offset++;
868         spin_unlock(&ci->i_ceph_lock);
869 
870         spin_lock(&dir->d_lock);
871         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
872         list_move(&dn->d_u.d_child, &dir->d_subdirs);
873         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
874              dn->d_u.d_child.prev, dn->d_u.d_child.next);
875         spin_unlock(&dn->d_lock);
876         spin_unlock(&dir->d_lock);
877 }
878 
879 /*
880  * splice a dentry to an inode.
881  * caller must hold directory i_mutex for this to be safe.
882  *
883  * we will only rehash the resulting dentry if @prehash is
884  * true; @prehash will be set to false (for the benefit of
885  * the caller) if we fail.
886  */
887 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
888                                     bool *prehash, bool set_offset)
889 {
890         struct dentry *realdn;
891 
892         BUG_ON(dn->d_inode);
893 
894         /* dn must be unhashed */
895         if (!d_unhashed(dn))
896                 d_drop(dn);
897         realdn = d_materialise_unique(dn, in);
898         if (IS_ERR(realdn)) {
899                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
900                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
901                 if (prehash)
902                         *prehash = false; /* don't rehash on error */
903                 dn = realdn; /* note realdn contains the error */
904                 goto out;
905         } else if (realdn) {
906                 dout("dn %p (%d) spliced with %p (%d) "
907                      "inode %p ino %llx.%llx\n",
908                      dn, dn->d_count,
909                      realdn, realdn->d_count,
910                      realdn->d_inode, ceph_vinop(realdn->d_inode));
911                 dput(dn);
912                 dn = realdn;
913         } else {
914                 BUG_ON(!ceph_dentry(dn));
915                 dout("dn %p attached to %p ino %llx.%llx\n",
916                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
917         }
918         if ((!prehash || *prehash) && d_unhashed(dn))
919                 d_rehash(dn);
920         if (set_offset)
921                 ceph_set_dentry_offset(dn);
922 out:
923         return dn;
924 }
925 
926 /*
927  * Incorporate results into the local cache.  This is either just
928  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
929  * after a lookup).
930  *
931  * A reply may contain
932  *         a directory inode along with a dentry.
933  *  and/or a target inode
934  *
935  * Called with snap_rwsem (read).
936  */
937 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
938                     struct ceph_mds_session *session)
939 {
940         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
941         struct inode *in = NULL;
942         struct ceph_mds_reply_inode *ininfo;
943         struct ceph_vino vino;
944         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
945         int i = 0;
946         int err = 0;
947 
948         dout("fill_trace %p is_dentry %d is_target %d\n", req,
949              rinfo->head->is_dentry, rinfo->head->is_target);
950 
951 #if 0
952         /*
953          * Debugging hook:
954          *
955          * If we resend completed ops to a recovering mds, we get no
956          * trace.  Since that is very rare, pretend this is the case
957          * to ensure the 'no trace' handlers in the callers behave.
958          *
959          * Fill in inodes unconditionally to avoid breaking cap
960          * invariants.
961          */
962         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
963                 pr_info("fill_trace faking empty trace on %lld %s\n",
964                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
965                 if (rinfo->head->is_dentry) {
966                         rinfo->head->is_dentry = 0;
967                         err = fill_inode(req->r_locked_dir,
968                                          &rinfo->diri, rinfo->dirfrag,
969                                          session, req->r_request_started, -1);
970                 }
971                 if (rinfo->head->is_target) {
972                         rinfo->head->is_target = 0;
973                         ininfo = rinfo->targeti.in;
974                         vino.ino = le64_to_cpu(ininfo->ino);
975                         vino.snap = le64_to_cpu(ininfo->snapid);
976                         in = ceph_get_inode(sb, vino);
977                         err = fill_inode(in, &rinfo->targeti, NULL,
978                                          session, req->r_request_started,
979                                          req->r_fmode);
980                         iput(in);
981                 }
982         }
983 #endif
984 
985         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
986                 dout("fill_trace reply is empty!\n");
987                 if (rinfo->head->result == 0 && req->r_locked_dir)
988                         ceph_invalidate_dir_request(req);
989                 return 0;
990         }
991 
992         if (rinfo->head->is_dentry) {
993                 struct inode *dir = req->r_locked_dir;
994 
995                 if (dir) {
996                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
997                                          session, req->r_request_started, -1,
998                                          &req->r_caps_reservation);
999                         if (err < 0)
1000                                 return err;
1001                 } else {
1002                         WARN_ON_ONCE(1);
1003                 }
1004         }
1005 
1006         /*
1007          * ignore null lease/binding on snapdir ENOENT, or else we
1008          * will have trouble splicing in the virtual snapdir later
1009          */
1010         if (rinfo->head->is_dentry && !req->r_aborted &&
1011             req->r_locked_dir &&
1012             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1013                                                fsc->mount_options->snapdir_name,
1014                                                req->r_dentry->d_name.len))) {
1015                 /*
1016                  * lookup link rename   : null -> possibly existing inode
1017                  * mknod symlink mkdir  : null -> new inode
1018                  * unlink               : linked -> null
1019                  */
1020                 struct inode *dir = req->r_locked_dir;
1021                 struct dentry *dn = req->r_dentry;
1022                 bool have_dir_cap, have_lease;
1023 
1024                 BUG_ON(!dn);
1025                 BUG_ON(!dir);
1026                 BUG_ON(dn->d_parent->d_inode != dir);
1027                 BUG_ON(ceph_ino(dir) !=
1028                        le64_to_cpu(rinfo->diri.in->ino));
1029                 BUG_ON(ceph_snap(dir) !=
1030                        le64_to_cpu(rinfo->diri.in->snapid));
1031 
1032                 /* do we have a lease on the whole dir? */
1033                 have_dir_cap =
1034                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1035                          CEPH_CAP_FILE_SHARED);
1036 
1037                 /* do we have a dn lease? */
1038                 have_lease = have_dir_cap ||
1039                         le32_to_cpu(rinfo->dlease->duration_ms);
1040                 if (!have_lease)
1041                         dout("fill_trace  no dentry lease or dir cap\n");
1042 
1043                 /* rename? */
1044                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1045                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1046                              req->r_old_dentry,
1047                              req->r_old_dentry->d_name.len,
1048                              req->r_old_dentry->d_name.name,
1049                              dn, dn->d_name.len, dn->d_name.name);
1050                         dout("fill_trace doing d_move %p -> %p\n",
1051                              req->r_old_dentry, dn);
1052 
1053                         d_move(req->r_old_dentry, dn);
1054                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1055                              req->r_old_dentry,
1056                              req->r_old_dentry->d_name.len,
1057                              req->r_old_dentry->d_name.name,
1058                              dn, dn->d_name.len, dn->d_name.name);
1059 
1060                         /* ensure target dentry is invalidated, despite
1061                            rehashing bug in vfs_rename_dir */
1062                         ceph_invalidate_dentry_lease(dn);
1063 
1064                         /*
1065                          * d_move() puts the renamed dentry at the end of
1066                          * d_subdirs.  We need to assign it an appropriate
1067                          * directory offset so we can behave when holding
1068                          * D_COMPLETE.
1069                          */
1070                         ceph_set_dentry_offset(req->r_old_dentry);
1071                         dout("dn %p gets new offset %lld\n", req->r_old_dentry, 
1072                              ceph_dentry(req->r_old_dentry)->offset);
1073 
1074                         dn = req->r_old_dentry;  /* use old_dentry */
1075                         in = dn->d_inode;
1076                 }
1077 
1078                 /* null dentry? */
1079                 if (!rinfo->head->is_target) {
1080                         dout("fill_trace null dentry\n");
1081                         if (dn->d_inode) {
1082                                 dout("d_delete %p\n", dn);
1083                                 d_delete(dn);
1084                         } else {
1085                                 dout("d_instantiate %p NULL\n", dn);
1086                                 d_instantiate(dn, NULL);
1087                                 if (have_lease && d_unhashed(dn))
1088                                         d_rehash(dn);
1089                                 update_dentry_lease(dn, rinfo->dlease,
1090                                                     session,
1091                                                     req->r_request_started);
1092                         }
1093                         goto done;
1094                 }
1095 
1096                 /* attach proper inode */
1097                 ininfo = rinfo->targeti.in;
1098                 vino.ino = le64_to_cpu(ininfo->ino);
1099                 vino.snap = le64_to_cpu(ininfo->snapid);
1100                 in = dn->d_inode;
1101                 if (!in) {
1102                         in = ceph_get_inode(sb, vino);
1103                         if (IS_ERR(in)) {
1104                                 pr_err("fill_trace bad get_inode "
1105                                        "%llx.%llx\n", vino.ino, vino.snap);
1106                                 err = PTR_ERR(in);
1107                                 d_drop(dn);
1108                                 goto done;
1109                         }
1110                         dn = splice_dentry(dn, in, &have_lease, true);
1111                         if (IS_ERR(dn)) {
1112                                 err = PTR_ERR(dn);
1113                                 goto done;
1114                         }
1115                         req->r_dentry = dn;  /* may have spliced */
1116                         ihold(in);
1117                 } else if (ceph_ino(in) == vino.ino &&
1118                            ceph_snap(in) == vino.snap) {
1119                         ihold(in);
1120                 } else {
1121                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1122                              dn, in, ceph_ino(in), ceph_snap(in),
1123                              vino.ino, vino.snap);
1124                         have_lease = false;
1125                         in = NULL;
1126                 }
1127 
1128                 if (have_lease)
1129                         update_dentry_lease(dn, rinfo->dlease, session,
1130                                             req->r_request_started);
1131                 dout(" final dn %p\n", dn);
1132                 i++;
1133         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1134                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1135                 struct dentry *dn = req->r_dentry;
1136 
1137                 /* fill out a snapdir LOOKUPSNAP dentry */
1138                 BUG_ON(!dn);
1139                 BUG_ON(!req->r_locked_dir);
1140                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1141                 ininfo = rinfo->targeti.in;
1142                 vino.ino = le64_to_cpu(ininfo->ino);
1143                 vino.snap = le64_to_cpu(ininfo->snapid);
1144                 in = ceph_get_inode(sb, vino);
1145                 if (IS_ERR(in)) {
1146                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1147                                vino.ino, vino.snap);
1148                         err = PTR_ERR(in);
1149                         d_delete(dn);
1150                         goto done;
1151                 }
1152                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1153                 dn = splice_dentry(dn, in, NULL, true);
1154                 if (IS_ERR(dn)) {
1155                         err = PTR_ERR(dn);
1156                         goto done;
1157                 }
1158                 req->r_dentry = dn;  /* may have spliced */
1159                 ihold(in);
1160                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1161         }
1162 
1163         if (rinfo->head->is_target) {
1164                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1165                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1166 
1167                 if (in == NULL || ceph_ino(in) != vino.ino ||
1168                     ceph_snap(in) != vino.snap) {
1169                         in = ceph_get_inode(sb, vino);
1170                         if (IS_ERR(in)) {
1171                                 err = PTR_ERR(in);
1172                                 goto done;
1173                         }
1174                 }
1175                 req->r_target_inode = in;
1176 
1177                 err = fill_inode(in,
1178                                  &rinfo->targeti, NULL,
1179                                  session, req->r_request_started,
1180                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1181                                  req->r_fmode : -1,
1182                                  &req->r_caps_reservation);
1183                 if (err < 0) {
1184                         pr_err("fill_inode badness %p %llx.%llx\n",
1185                                in, ceph_vinop(in));
1186                         goto done;
1187                 }
1188         }
1189 
1190 done:
1191         dout("fill_trace done err=%d\n", err);
1192         return err;
1193 }
1194 
1195 /*
1196  * Prepopulate our cache with readdir results, leases, etc.
1197  */
1198 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1199                              struct ceph_mds_session *session)
1200 {
1201         struct dentry *parent = req->r_dentry;
1202         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1203         struct qstr dname;
1204         struct dentry *dn;
1205         struct inode *in;
1206         int err = 0, i;
1207         struct inode *snapdir = NULL;
1208         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1209         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1210         struct ceph_dentry_info *di;
1211 
1212         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1213                 snapdir = ceph_get_snapdir(parent->d_inode);
1214                 parent = d_find_alias(snapdir);
1215                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1216                      rinfo->dir_nr, parent);
1217         } else {
1218                 dout("readdir_prepopulate %d items under dn %p\n",
1219                      rinfo->dir_nr, parent);
1220                 if (rinfo->dir_dir)
1221                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1222         }
1223 
1224         for (i = 0; i < rinfo->dir_nr; i++) {
1225                 struct ceph_vino vino;
1226 
1227                 dname.name = rinfo->dir_dname[i];
1228                 dname.len = rinfo->dir_dname_len[i];
1229                 dname.hash = full_name_hash(dname.name, dname.len);
1230 
1231                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1232                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1233 
1234 retry_lookup:
1235                 dn = d_lookup(parent, &dname);
1236                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1237                      parent, dname.len, dname.name, dn);
1238 
1239                 if (!dn) {
1240                         dn = d_alloc(parent, &dname);
1241                         dout("d_alloc %p '%.*s' = %p\n", parent,
1242                              dname.len, dname.name, dn);
1243                         if (dn == NULL) {
1244                                 dout("d_alloc badness\n");
1245                                 err = -ENOMEM;
1246                                 goto out;
1247                         }
1248                         err = ceph_init_dentry(dn);
1249                         if (err < 0) {
1250                                 dput(dn);
1251                                 goto out;
1252                         }
1253                 } else if (dn->d_inode &&
1254                            (ceph_ino(dn->d_inode) != vino.ino ||
1255                             ceph_snap(dn->d_inode) != vino.snap)) {
1256                         dout(" dn %p points to wrong inode %p\n",
1257                              dn, dn->d_inode);
1258                         d_delete(dn);
1259                         dput(dn);
1260                         goto retry_lookup;
1261                 } else {
1262                         /* reorder parent's d_subdirs */
1263                         spin_lock(&parent->d_lock);
1264                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1265                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1266                         spin_unlock(&dn->d_lock);
1267                         spin_unlock(&parent->d_lock);
1268                 }
1269 
1270                 di = dn->d_fsdata;
1271                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1272 
1273                 /* inode */
1274                 if (dn->d_inode) {
1275                         in = dn->d_inode;
1276                 } else {
1277                         in = ceph_get_inode(parent->d_sb, vino);
1278                         if (IS_ERR(in)) {
1279                                 dout("new_inode badness\n");
1280                                 d_drop(dn);
1281                                 dput(dn);
1282                                 err = PTR_ERR(in);
1283                                 goto out;
1284                         }
1285                         dn = splice_dentry(dn, in, NULL, false);
1286                         if (IS_ERR(dn))
1287                                 dn = NULL;
1288                 }
1289 
1290                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1291                                req->r_request_started, -1,
1292                                &req->r_caps_reservation) < 0) {
1293                         pr_err("fill_inode badness on %p\n", in);
1294                         goto next_item;
1295                 }
1296                 if (dn)
1297                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1298                                             req->r_session,
1299                                             req->r_request_started);
1300 next_item:
1301                 if (dn)
1302                         dput(dn);
1303         }
1304         req->r_did_prepopulate = true;
1305 
1306 out:
1307         if (snapdir) {
1308                 iput(snapdir);
1309                 dput(parent);
1310         }
1311         dout("readdir_prepopulate done\n");
1312         return err;
1313 }
1314 
1315 int ceph_inode_set_size(struct inode *inode, loff_t size)
1316 {
1317         struct ceph_inode_info *ci = ceph_inode(inode);
1318         int ret = 0;
1319 
1320         spin_lock(&ci->i_ceph_lock);
1321         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1322         inode->i_size = size;
1323         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1324 
1325         /* tell the MDS if we are approaching max_size */
1326         if ((size << 1) >= ci->i_max_size &&
1327             (ci->i_reported_size << 1) < ci->i_max_size)
1328                 ret = 1;
1329 
1330         spin_unlock(&ci->i_ceph_lock);
1331         return ret;
1332 }
1333 
1334 /*
1335  * Write back inode data in a worker thread.  (This can't be done
1336  * in the message handler context.)
1337  */
1338 void ceph_queue_writeback(struct inode *inode)
1339 {
1340         ihold(inode);
1341         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1342                        &ceph_inode(inode)->i_wb_work)) {
1343                 dout("ceph_queue_writeback %p\n", inode);
1344         } else {
1345                 dout("ceph_queue_writeback %p failed\n", inode);
1346                 iput(inode);
1347         }
1348 }
1349 
1350 static void ceph_writeback_work(struct work_struct *work)
1351 {
1352         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1353                                                   i_wb_work);
1354         struct inode *inode = &ci->vfs_inode;
1355 
1356         dout("writeback %p\n", inode);
1357         filemap_fdatawrite(&inode->i_data);
1358         iput(inode);
1359 }
1360 
1361 /*
1362  * queue an async invalidation
1363  */
1364 void ceph_queue_invalidate(struct inode *inode)
1365 {
1366         ihold(inode);
1367         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1368                        &ceph_inode(inode)->i_pg_inv_work)) {
1369                 dout("ceph_queue_invalidate %p\n", inode);
1370         } else {
1371                 dout("ceph_queue_invalidate %p failed\n", inode);
1372                 iput(inode);
1373         }
1374 }
1375 
1376 /*
1377  * Invalidate inode pages in a worker thread.  (This can't be done
1378  * in the message handler context.)
1379  */
1380 static void ceph_invalidate_work(struct work_struct *work)
1381 {
1382         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1383                                                   i_pg_inv_work);
1384         struct inode *inode = &ci->vfs_inode;
1385         u32 orig_gen;
1386         int check = 0;
1387 
1388         spin_lock(&ci->i_ceph_lock);
1389         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1390              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1391         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1392                 /* nevermind! */
1393                 spin_unlock(&ci->i_ceph_lock);
1394                 goto out;
1395         }
1396         orig_gen = ci->i_rdcache_gen;
1397         spin_unlock(&ci->i_ceph_lock);
1398 
1399         truncate_inode_pages(&inode->i_data, 0);
1400 
1401         spin_lock(&ci->i_ceph_lock);
1402         if (orig_gen == ci->i_rdcache_gen &&
1403             orig_gen == ci->i_rdcache_revoking) {
1404                 dout("invalidate_pages %p gen %d successful\n", inode,
1405                      ci->i_rdcache_gen);
1406                 ci->i_rdcache_revoking--;
1407                 check = 1;
1408         } else {
1409                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1410                      inode, orig_gen, ci->i_rdcache_gen,
1411                      ci->i_rdcache_revoking);
1412         }
1413         spin_unlock(&ci->i_ceph_lock);
1414 
1415         if (check)
1416                 ceph_check_caps(ci, 0, NULL);
1417 out:
1418         iput(inode);
1419 }
1420 
1421 
1422 /*
1423  * called by trunc_wq; take i_mutex ourselves
1424  *
1425  * We also truncate in a separate thread as well.
1426  */
1427 static void ceph_vmtruncate_work(struct work_struct *work)
1428 {
1429         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1430                                                   i_vmtruncate_work);
1431         struct inode *inode = &ci->vfs_inode;
1432 
1433         dout("vmtruncate_work %p\n", inode);
1434         mutex_lock(&inode->i_mutex);
1435         __ceph_do_pending_vmtruncate(inode);
1436         mutex_unlock(&inode->i_mutex);
1437         iput(inode);
1438 }
1439 
1440 /*
1441  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1442  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1443  */
1444 void ceph_queue_vmtruncate(struct inode *inode)
1445 {
1446         struct ceph_inode_info *ci = ceph_inode(inode);
1447 
1448         ihold(inode);
1449         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1450                        &ci->i_vmtruncate_work)) {
1451                 dout("ceph_queue_vmtruncate %p\n", inode);
1452         } else {
1453                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1454                      inode, ci->i_truncate_pending);
1455                 iput(inode);
1456         }
1457 }
1458 
1459 /*
1460  * called with i_mutex held.
1461  *
1462  * Make sure any pending truncation is applied before doing anything
1463  * that may depend on it.
1464  */
1465 void __ceph_do_pending_vmtruncate(struct inode *inode)
1466 {
1467         struct ceph_inode_info *ci = ceph_inode(inode);
1468         u64 to;
1469         int wrbuffer_refs, finish = 0;
1470 
1471 retry:
1472         spin_lock(&ci->i_ceph_lock);
1473         if (ci->i_truncate_pending == 0) {
1474                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1475                 spin_unlock(&ci->i_ceph_lock);
1476                 return;
1477         }
1478 
1479         /*
1480          * make sure any dirty snapped pages are flushed before we
1481          * possibly truncate them.. so write AND block!
1482          */
1483         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1484                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1485                      inode);
1486                 spin_unlock(&ci->i_ceph_lock);
1487                 filemap_write_and_wait_range(&inode->i_data, 0,
1488                                              inode->i_sb->s_maxbytes);
1489                 goto retry;
1490         }
1491 
1492         to = ci->i_truncate_size;
1493         wrbuffer_refs = ci->i_wrbuffer_ref;
1494         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1495              ci->i_truncate_pending, to);
1496         spin_unlock(&ci->i_ceph_lock);
1497 
1498         truncate_inode_pages(inode->i_mapping, to);
1499 
1500         spin_lock(&ci->i_ceph_lock);
1501         if (to == ci->i_truncate_size) {
1502                 ci->i_truncate_pending = 0;
1503                 finish = 1;
1504         }
1505         spin_unlock(&ci->i_ceph_lock);
1506         if (!finish)
1507                 goto retry;
1508 
1509         if (wrbuffer_refs == 0)
1510                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1511 
1512         wake_up_all(&ci->i_cap_wq);
1513 }
1514 
1515 
1516 /*
1517  * symlinks
1518  */
1519 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1520 {
1521         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1522         nd_set_link(nd, ci->i_symlink);
1523         return NULL;
1524 }
1525 
1526 static const struct inode_operations ceph_symlink_iops = {
1527         .readlink = generic_readlink,
1528         .follow_link = ceph_sym_follow_link,
1529 };
1530 
1531 /*
1532  * setattr
1533  */
1534 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1535 {
1536         struct inode *inode = dentry->d_inode;
1537         struct ceph_inode_info *ci = ceph_inode(inode);
1538         struct inode *parent_inode;
1539         const unsigned int ia_valid = attr->ia_valid;
1540         struct ceph_mds_request *req;
1541         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1542         int issued;
1543         int release = 0, dirtied = 0;
1544         int mask = 0;
1545         int err = 0;
1546         int inode_dirty_flags = 0;
1547 
1548         if (ceph_snap(inode) != CEPH_NOSNAP)
1549                 return -EROFS;
1550 
1551         __ceph_do_pending_vmtruncate(inode);
1552 
1553         err = inode_change_ok(inode, attr);
1554         if (err != 0)
1555                 return err;
1556 
1557         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1558                                        USE_AUTH_MDS);
1559         if (IS_ERR(req))
1560                 return PTR_ERR(req);
1561 
1562         spin_lock(&ci->i_ceph_lock);
1563         issued = __ceph_caps_issued(ci, NULL);
1564         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1565 
1566         if (ia_valid & ATTR_UID) {
1567                 dout("setattr %p uid %d -> %d\n", inode,
1568                      inode->i_uid, attr->ia_uid);
1569                 if (issued & CEPH_CAP_AUTH_EXCL) {
1570                         inode->i_uid = attr->ia_uid;
1571                         dirtied |= CEPH_CAP_AUTH_EXCL;
1572                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1573                            attr->ia_uid != inode->i_uid) {
1574                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1575                         mask |= CEPH_SETATTR_UID;
1576                         release |= CEPH_CAP_AUTH_SHARED;
1577                 }
1578         }
1579         if (ia_valid & ATTR_GID) {
1580                 dout("setattr %p gid %d -> %d\n", inode,
1581                      inode->i_gid, attr->ia_gid);
1582                 if (issued & CEPH_CAP_AUTH_EXCL) {
1583                         inode->i_gid = attr->ia_gid;
1584                         dirtied |= CEPH_CAP_AUTH_EXCL;
1585                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1586                            attr->ia_gid != inode->i_gid) {
1587                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1588                         mask |= CEPH_SETATTR_GID;
1589                         release |= CEPH_CAP_AUTH_SHARED;
1590                 }
1591         }
1592         if (ia_valid & ATTR_MODE) {
1593                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1594                      attr->ia_mode);
1595                 if (issued & CEPH_CAP_AUTH_EXCL) {
1596                         inode->i_mode = attr->ia_mode;
1597                         dirtied |= CEPH_CAP_AUTH_EXCL;
1598                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1599                            attr->ia_mode != inode->i_mode) {
1600                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1601                         mask |= CEPH_SETATTR_MODE;
1602                         release |= CEPH_CAP_AUTH_SHARED;
1603                 }
1604         }
1605 
1606         if (ia_valid & ATTR_ATIME) {
1607                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1608                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1609                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1610                 if (issued & CEPH_CAP_FILE_EXCL) {
1611                         ci->i_time_warp_seq++;
1612                         inode->i_atime = attr->ia_atime;
1613                         dirtied |= CEPH_CAP_FILE_EXCL;
1614                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1615                            timespec_compare(&inode->i_atime,
1616                                             &attr->ia_atime) < 0) {
1617                         inode->i_atime = attr->ia_atime;
1618                         dirtied |= CEPH_CAP_FILE_WR;
1619                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1620                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1621                         ceph_encode_timespec(&req->r_args.setattr.atime,
1622                                              &attr->ia_atime);
1623                         mask |= CEPH_SETATTR_ATIME;
1624                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1625                                 CEPH_CAP_FILE_WR;
1626                 }
1627         }
1628         if (ia_valid & ATTR_MTIME) {
1629                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1630                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1631                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1632                 if (issued & CEPH_CAP_FILE_EXCL) {
1633                         ci->i_time_warp_seq++;
1634                         inode->i_mtime = attr->ia_mtime;
1635                         dirtied |= CEPH_CAP_FILE_EXCL;
1636                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1637                            timespec_compare(&inode->i_mtime,
1638                                             &attr->ia_mtime) < 0) {
1639                         inode->i_mtime = attr->ia_mtime;
1640                         dirtied |= CEPH_CAP_FILE_WR;
1641                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1642                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1643                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1644                                              &attr->ia_mtime);
1645                         mask |= CEPH_SETATTR_MTIME;
1646                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1647                                 CEPH_CAP_FILE_WR;
1648                 }
1649         }
1650         if (ia_valid & ATTR_SIZE) {
1651                 dout("setattr %p size %lld -> %lld\n", inode,
1652                      inode->i_size, attr->ia_size);
1653                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1654                         err = -EINVAL;
1655                         goto out;
1656                 }
1657                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1658                     attr->ia_size > inode->i_size) {
1659                         inode->i_size = attr->ia_size;
1660                         inode->i_blocks =
1661                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1662                         inode->i_ctime = attr->ia_ctime;
1663                         ci->i_reported_size = attr->ia_size;
1664                         dirtied |= CEPH_CAP_FILE_EXCL;
1665                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1666                            attr->ia_size != inode->i_size) {
1667                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1668                         req->r_args.setattr.old_size =
1669                                 cpu_to_le64(inode->i_size);
1670                         mask |= CEPH_SETATTR_SIZE;
1671                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1672                                 CEPH_CAP_FILE_WR;
1673                 }
1674         }
1675 
1676         /* these do nothing */
1677         if (ia_valid & ATTR_CTIME) {
1678                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1679                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1680                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1681                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1682                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1683                      only ? "ctime only" : "ignored");
1684                 inode->i_ctime = attr->ia_ctime;
1685                 if (only) {
1686                         /*
1687                          * if kernel wants to dirty ctime but nothing else,
1688                          * we need to choose a cap to dirty under, or do
1689                          * a almost-no-op setattr
1690                          */
1691                         if (issued & CEPH_CAP_AUTH_EXCL)
1692                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1693                         else if (issued & CEPH_CAP_FILE_EXCL)
1694                                 dirtied |= CEPH_CAP_FILE_EXCL;
1695                         else if (issued & CEPH_CAP_XATTR_EXCL)
1696                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1697                         else
1698                                 mask |= CEPH_SETATTR_CTIME;
1699                 }
1700         }
1701         if (ia_valid & ATTR_FILE)
1702                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1703 
1704         if (dirtied) {
1705                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1706                 inode->i_ctime = CURRENT_TIME;
1707         }
1708 
1709         release &= issued;
1710         spin_unlock(&ci->i_ceph_lock);
1711 
1712         if (inode_dirty_flags)
1713                 __mark_inode_dirty(inode, inode_dirty_flags);
1714 
1715         if (mask) {
1716                 req->r_inode = inode;
1717                 ihold(inode);
1718                 req->r_inode_drop = release;
1719                 req->r_args.setattr.mask = cpu_to_le32(mask);
1720                 req->r_num_caps = 1;
1721                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1722                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1723                 iput(parent_inode);
1724         }
1725         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1726              ceph_cap_string(dirtied), mask);
1727 
1728         ceph_mdsc_put_request(req);
1729         __ceph_do_pending_vmtruncate(inode);
1730         return err;
1731 out:
1732         spin_unlock(&ci->i_ceph_lock);
1733         ceph_mdsc_put_request(req);
1734         return err;
1735 }
1736 
1737 /*
1738  * Verify that we have a lease on the given mask.  If not,
1739  * do a getattr against an mds.
1740  */
1741 int ceph_do_getattr(struct inode *inode, int mask)
1742 {
1743         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1744         struct ceph_mds_client *mdsc = fsc->mdsc;
1745         struct ceph_mds_request *req;
1746         int err;
1747 
1748         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1749                 dout("do_getattr inode %p SNAPDIR\n", inode);
1750                 return 0;
1751         }
1752 
1753         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1754         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1755                 return 0;
1756 
1757         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1758         if (IS_ERR(req))
1759                 return PTR_ERR(req);
1760         req->r_inode = inode;
1761         ihold(inode);
1762         req->r_num_caps = 1;
1763         req->r_args.getattr.mask = cpu_to_le32(mask);
1764         err = ceph_mdsc_do_request(mdsc, NULL, req);
1765         ceph_mdsc_put_request(req);
1766         dout("do_getattr result=%d\n", err);
1767         return err;
1768 }
1769 
1770 
1771 /*
1772  * Check inode permissions.  We verify we have a valid value for
1773  * the AUTH cap, then call the generic handler.
1774  */
1775 int ceph_permission(struct inode *inode, int mask)
1776 {
1777         int err;
1778 
1779         if (mask & MAY_NOT_BLOCK)
1780                 return -ECHILD;
1781 
1782         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1783 
1784         if (!err)
1785                 err = generic_permission(inode, mask);
1786         return err;
1787 }
1788 
1789 /*
1790  * Get all attributes.  Hopefully somedata we'll have a statlite()
1791  * and can limit the fields we require to be accurate.
1792  */
1793 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1794                  struct kstat *stat)
1795 {
1796         struct inode *inode = dentry->d_inode;
1797         struct ceph_inode_info *ci = ceph_inode(inode);
1798         int err;
1799 
1800         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1801         if (!err) {
1802                 generic_fillattr(inode, stat);
1803                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1804                 if (ceph_snap(inode) != CEPH_NOSNAP)
1805                         stat->dev = ceph_snap(inode);
1806                 else
1807                         stat->dev = 0;
1808                 if (S_ISDIR(inode->i_mode)) {
1809                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1810                                                 RBYTES))
1811                                 stat->size = ci->i_rbytes;
1812                         else
1813                                 stat->size = ci->i_files + ci->i_subdirs;
1814                         stat->blocks = 0;
1815                         stat->blksize = 65536;
1816                 }
1817         }
1818         return err;
1819 }
1820 

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