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ceph: use I_COMPLETE inode flag instead of D_COMPLETE flag
[deliverable/linux.git] / fs / ceph / inode.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15 #include <linux/ceph/decode.h>
16
17 /*
18 * Ceph inode operations
19 *
20 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
21 * setattr, etc.), xattr helpers, and helpers for assimilating
22 * metadata returned by the MDS into our cache.
23 *
24 * Also define helpers for doing asynchronous writeback, invalidation,
25 * and truncation for the benefit of those who can't afford to block
26 * (typically because they are in the message handler path).
27 */
28
29 static const struct inode_operations ceph_symlink_iops;
30
31 static void ceph_invalidate_work(struct work_struct *work);
32 static void ceph_writeback_work(struct work_struct *work);
33 static void ceph_vmtruncate_work(struct work_struct *work);
34
35 /*
36 * find or create an inode, given the ceph ino number
37 */
38 static int ceph_set_ino_cb(struct inode *inode, void *data)
39 {
40 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
41 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
42 return 0;
43 }
44
45 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
46 {
47 struct inode *inode;
48 ino_t t = ceph_vino_to_ino(vino);
49
50 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
51 if (inode == NULL)
52 return ERR_PTR(-ENOMEM);
53 if (inode->i_state & I_NEW) {
54 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
55 inode, ceph_vinop(inode), (u64)inode->i_ino);
56 unlock_new_inode(inode);
57 }
58
59 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
60 vino.snap, inode);
61 return inode;
62 }
63
64 /*
65 * get/constuct snapdir inode for a given directory
66 */
67 struct inode *ceph_get_snapdir(struct inode *parent)
68 {
69 struct ceph_vino vino = {
70 .ino = ceph_ino(parent),
71 .snap = CEPH_SNAPDIR,
72 };
73 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
74 struct ceph_inode_info *ci = ceph_inode(inode);
75
76 BUG_ON(!S_ISDIR(parent->i_mode));
77 if (IS_ERR(inode))
78 return inode;
79 inode->i_mode = parent->i_mode;
80 inode->i_uid = parent->i_uid;
81 inode->i_gid = parent->i_gid;
82 inode->i_op = &ceph_dir_iops;
83 inode->i_fop = &ceph_dir_fops;
84 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
85 ci->i_rbytes = 0;
86 return inode;
87 }
88
89 const struct inode_operations ceph_file_iops = {
90 .permission = ceph_permission,
91 .setattr = ceph_setattr,
92 .getattr = ceph_getattr,
93 .setxattr = ceph_setxattr,
94 .getxattr = ceph_getxattr,
95 .listxattr = ceph_listxattr,
96 .removexattr = ceph_removexattr,
97 };
98
99
100 /*
101 * We use a 'frag tree' to keep track of the MDS's directory fragments
102 * for a given inode (usually there is just a single fragment). We
103 * need to know when a child frag is delegated to a new MDS, or when
104 * it is flagged as replicated, so we can direct our requests
105 * accordingly.
106 */
107
108 /*
109 * find/create a frag in the tree
110 */
111 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
112 u32 f)
113 {
114 struct rb_node **p;
115 struct rb_node *parent = NULL;
116 struct ceph_inode_frag *frag;
117 int c;
118
119 p = &ci->i_fragtree.rb_node;
120 while (*p) {
121 parent = *p;
122 frag = rb_entry(parent, struct ceph_inode_frag, node);
123 c = ceph_frag_compare(f, frag->frag);
124 if (c < 0)
125 p = &(*p)->rb_left;
126 else if (c > 0)
127 p = &(*p)->rb_right;
128 else
129 return frag;
130 }
131
132 frag = kmalloc(sizeof(*frag), GFP_NOFS);
133 if (!frag) {
134 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
135 "frag %x\n", &ci->vfs_inode,
136 ceph_vinop(&ci->vfs_inode), f);
137 return ERR_PTR(-ENOMEM);
138 }
139 frag->frag = f;
140 frag->split_by = 0;
141 frag->mds = -1;
142 frag->ndist = 0;
143
144 rb_link_node(&frag->node, parent, p);
145 rb_insert_color(&frag->node, &ci->i_fragtree);
146
147 dout("get_or_create_frag added %llx.%llx frag %x\n",
148 ceph_vinop(&ci->vfs_inode), f);
149 return frag;
150 }
151
152 /*
153 * find a specific frag @f
154 */
155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
156 {
157 struct rb_node *n = ci->i_fragtree.rb_node;
158
159 while (n) {
160 struct ceph_inode_frag *frag =
161 rb_entry(n, struct ceph_inode_frag, node);
162 int c = ceph_frag_compare(f, frag->frag);
163 if (c < 0)
164 n = n->rb_left;
165 else if (c > 0)
166 n = n->rb_right;
167 else
168 return frag;
169 }
170 return NULL;
171 }
172
173 /*
174 * Choose frag containing the given value @v. If @pfrag is
175 * specified, copy the frag delegation info to the caller if
176 * it is present.
177 */
178 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
179 struct ceph_inode_frag *pfrag,
180 int *found)
181 {
182 u32 t = ceph_frag_make(0, 0);
183 struct ceph_inode_frag *frag;
184 unsigned nway, i;
185 u32 n;
186
187 if (found)
188 *found = 0;
189
190 mutex_lock(&ci->i_fragtree_mutex);
191 while (1) {
192 WARN_ON(!ceph_frag_contains_value(t, v));
193 frag = __ceph_find_frag(ci, t);
194 if (!frag)
195 break; /* t is a leaf */
196 if (frag->split_by == 0) {
197 if (pfrag)
198 memcpy(pfrag, frag, sizeof(*pfrag));
199 if (found)
200 *found = 1;
201 break;
202 }
203
204 /* choose child */
205 nway = 1 << frag->split_by;
206 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
207 frag->split_by, nway);
208 for (i = 0; i < nway; i++) {
209 n = ceph_frag_make_child(t, frag->split_by, i);
210 if (ceph_frag_contains_value(n, v)) {
211 t = n;
212 break;
213 }
214 }
215 BUG_ON(i == nway);
216 }
217 dout("choose_frag(%x) = %x\n", v, t);
218
219 mutex_unlock(&ci->i_fragtree_mutex);
220 return t;
221 }
222
223 /*
224 * Process dirfrag (delegation) info from the mds. Include leaf
225 * fragment in tree ONLY if ndist > 0. Otherwise, only
226 * branches/splits are included in i_fragtree)
227 */
228 static int ceph_fill_dirfrag(struct inode *inode,
229 struct ceph_mds_reply_dirfrag *dirinfo)
230 {
231 struct ceph_inode_info *ci = ceph_inode(inode);
232 struct ceph_inode_frag *frag;
233 u32 id = le32_to_cpu(dirinfo->frag);
234 int mds = le32_to_cpu(dirinfo->auth);
235 int ndist = le32_to_cpu(dirinfo->ndist);
236 int i;
237 int err = 0;
238
239 mutex_lock(&ci->i_fragtree_mutex);
240 if (ndist == 0) {
241 /* no delegation info needed. */
242 frag = __ceph_find_frag(ci, id);
243 if (!frag)
244 goto out;
245 if (frag->split_by == 0) {
246 /* tree leaf, remove */
247 dout("fill_dirfrag removed %llx.%llx frag %x"
248 " (no ref)\n", ceph_vinop(inode), id);
249 rb_erase(&frag->node, &ci->i_fragtree);
250 kfree(frag);
251 } else {
252 /* tree branch, keep and clear */
253 dout("fill_dirfrag cleared %llx.%llx frag %x"
254 " referral\n", ceph_vinop(inode), id);
255 frag->mds = -1;
256 frag->ndist = 0;
257 }
258 goto out;
259 }
260
261
262 /* find/add this frag to store mds delegation info */
263 frag = __get_or_create_frag(ci, id);
264 if (IS_ERR(frag)) {
265 /* this is not the end of the world; we can continue
266 with bad/inaccurate delegation info */
267 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
268 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
269 err = -ENOMEM;
270 goto out;
271 }
272
273 frag->mds = mds;
274 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
275 for (i = 0; i < frag->ndist; i++)
276 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
277 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
278 ceph_vinop(inode), frag->frag, frag->ndist);
279
280 out:
281 mutex_unlock(&ci->i_fragtree_mutex);
282 return err;
283 }
284
285
286 /*
287 * initialize a newly allocated inode.
288 */
289 struct inode *ceph_alloc_inode(struct super_block *sb)
290 {
291 struct ceph_inode_info *ci;
292 int i;
293
294 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
295 if (!ci)
296 return NULL;
297
298 dout("alloc_inode %p\n", &ci->vfs_inode);
299
300 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 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(&ci->i_ceph_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 = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
614 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
615 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
616 from_kuid(&init_user_ns, inode->i_uid),
617 from_kgid(&init_user_ns, inode->i_gid));
618 }
619
620 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
621 set_nlink(inode, le32_to_cpu(info->nlink));
622
623 /* be careful with mtime, atime, size */
624 ceph_decode_timespec(&atime, &info->atime);
625 ceph_decode_timespec(&mtime, &info->mtime);
626 ceph_decode_timespec(&ctime, &info->ctime);
627 queue_trunc = ceph_fill_file_size(inode, issued,
628 le32_to_cpu(info->truncate_seq),
629 le64_to_cpu(info->truncate_size),
630 le64_to_cpu(info->size));
631 ceph_fill_file_time(inode, issued,
632 le32_to_cpu(info->time_warp_seq),
633 &ctime, &mtime, &atime);
634
635 /* only update max_size on auth cap */
636 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
637 ci->i_max_size != le64_to_cpu(info->max_size)) {
638 dout("max_size %lld -> %llu\n", ci->i_max_size,
639 le64_to_cpu(info->max_size));
640 ci->i_max_size = le64_to_cpu(info->max_size);
641 }
642
643 ci->i_layout = info->layout;
644 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
645
646 /* xattrs */
647 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
648 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
649 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
650 if (ci->i_xattrs.blob)
651 ceph_buffer_put(ci->i_xattrs.blob);
652 ci->i_xattrs.blob = xattr_blob;
653 if (xattr_blob)
654 memcpy(ci->i_xattrs.blob->vec.iov_base,
655 iinfo->xattr_data, iinfo->xattr_len);
656 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
657 xattr_blob = NULL;
658 }
659
660 inode->i_mapping->a_ops = &ceph_aops;
661 inode->i_mapping->backing_dev_info =
662 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
663
664 switch (inode->i_mode & S_IFMT) {
665 case S_IFIFO:
666 case S_IFBLK:
667 case S_IFCHR:
668 case S_IFSOCK:
669 init_special_inode(inode, inode->i_mode, inode->i_rdev);
670 inode->i_op = &ceph_file_iops;
671 break;
672 case S_IFREG:
673 inode->i_op = &ceph_file_iops;
674 inode->i_fop = &ceph_file_fops;
675 break;
676 case S_IFLNK:
677 inode->i_op = &ceph_symlink_iops;
678 if (!ci->i_symlink) {
679 u32 symlen = iinfo->symlink_len;
680 char *sym;
681
682 spin_unlock(&ci->i_ceph_lock);
683
684 err = -EINVAL;
685 if (WARN_ON(symlen != inode->i_size))
686 goto out;
687
688 err = -ENOMEM;
689 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
690 if (!sym)
691 goto out;
692
693 spin_lock(&ci->i_ceph_lock);
694 if (!ci->i_symlink)
695 ci->i_symlink = sym;
696 else
697 kfree(sym); /* lost a race */
698 }
699 break;
700 case S_IFDIR:
701 inode->i_op = &ceph_dir_iops;
702 inode->i_fop = &ceph_dir_fops;
703
704 ci->i_dir_layout = iinfo->dir_layout;
705
706 ci->i_files = le64_to_cpu(info->files);
707 ci->i_subdirs = le64_to_cpu(info->subdirs);
708 ci->i_rbytes = le64_to_cpu(info->rbytes);
709 ci->i_rfiles = le64_to_cpu(info->rfiles);
710 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
711 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
712 break;
713 default:
714 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
715 ceph_vinop(inode), inode->i_mode);
716 }
717
718 /* set dir completion flag? */
719 if (S_ISDIR(inode->i_mode) &&
720 ci->i_files == 0 && ci->i_subdirs == 0 &&
721 ceph_snap(inode) == CEPH_NOSNAP &&
722 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
723 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
724 (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
725 dout(" marking %p complete (empty)\n", inode);
726 ci->i_ceph_flags |= CEPH_I_COMPLETE;
727 ci->i_max_offset = 2;
728 }
729 no_change:
730 spin_unlock(&ci->i_ceph_lock);
731
732 /* queue truncate if we saw i_size decrease */
733 if (queue_trunc)
734 ceph_queue_vmtruncate(inode);
735
736 /* populate frag tree */
737 /* FIXME: move me up, if/when version reflects fragtree changes */
738 nsplits = le32_to_cpu(info->fragtree.nsplits);
739 mutex_lock(&ci->i_fragtree_mutex);
740 for (i = 0; i < nsplits; i++) {
741 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
742 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
743
744 if (IS_ERR(frag))
745 continue;
746 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
747 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
748 }
749 mutex_unlock(&ci->i_fragtree_mutex);
750
751 /* were we issued a capability? */
752 if (info->cap.caps) {
753 if (ceph_snap(inode) == CEPH_NOSNAP) {
754 ceph_add_cap(inode, session,
755 le64_to_cpu(info->cap.cap_id),
756 cap_fmode,
757 le32_to_cpu(info->cap.caps),
758 le32_to_cpu(info->cap.wanted),
759 le32_to_cpu(info->cap.seq),
760 le32_to_cpu(info->cap.mseq),
761 le64_to_cpu(info->cap.realm),
762 info->cap.flags,
763 caps_reservation);
764 } else {
765 spin_lock(&ci->i_ceph_lock);
766 dout(" %p got snap_caps %s\n", inode,
767 ceph_cap_string(le32_to_cpu(info->cap.caps)));
768 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
769 if (cap_fmode >= 0)
770 __ceph_get_fmode(ci, cap_fmode);
771 spin_unlock(&ci->i_ceph_lock);
772 }
773 } else if (cap_fmode >= 0) {
774 pr_warning("mds issued no caps on %llx.%llx\n",
775 ceph_vinop(inode));
776 __ceph_get_fmode(ci, cap_fmode);
777 }
778
779 /* update delegation info? */
780 if (dirinfo)
781 ceph_fill_dirfrag(inode, dirinfo);
782
783 err = 0;
784
785 out:
786 if (xattr_blob)
787 ceph_buffer_put(xattr_blob);
788 return err;
789 }
790
791 /*
792 * caller should hold session s_mutex.
793 */
794 static void update_dentry_lease(struct dentry *dentry,
795 struct ceph_mds_reply_lease *lease,
796 struct ceph_mds_session *session,
797 unsigned long from_time)
798 {
799 struct ceph_dentry_info *di = ceph_dentry(dentry);
800 long unsigned duration = le32_to_cpu(lease->duration_ms);
801 long unsigned ttl = from_time + (duration * HZ) / 1000;
802 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
803 struct inode *dir;
804
805 /* only track leases on regular dentries */
806 if (dentry->d_op != &ceph_dentry_ops)
807 return;
808
809 spin_lock(&dentry->d_lock);
810 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
811 dentry, duration, ttl);
812
813 /* make lease_rdcache_gen match directory */
814 dir = dentry->d_parent->d_inode;
815 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
816
817 if (duration == 0)
818 goto out_unlock;
819
820 if (di->lease_gen == session->s_cap_gen &&
821 time_before(ttl, dentry->d_time))
822 goto out_unlock; /* we already have a newer lease. */
823
824 if (di->lease_session && di->lease_session != session)
825 goto out_unlock;
826
827 ceph_dentry_lru_touch(dentry);
828
829 if (!di->lease_session)
830 di->lease_session = ceph_get_mds_session(session);
831 di->lease_gen = session->s_cap_gen;
832 di->lease_seq = le32_to_cpu(lease->seq);
833 di->lease_renew_after = half_ttl;
834 di->lease_renew_from = 0;
835 dentry->d_time = ttl;
836 out_unlock:
837 spin_unlock(&dentry->d_lock);
838 return;
839 }
840
841 /*
842 * Set dentry's directory position based on the current dir's max, and
843 * order it in d_subdirs, so that dcache_readdir behaves.
844 *
845 * Always called under directory's i_mutex.
846 */
847 static void ceph_set_dentry_offset(struct dentry *dn)
848 {
849 struct dentry *dir = dn->d_parent;
850 struct inode *inode = dir->d_inode;
851 struct ceph_inode_info *ci;
852 struct ceph_dentry_info *di;
853
854 BUG_ON(!inode);
855
856 ci = ceph_inode(inode);
857 di = ceph_dentry(dn);
858
859 spin_lock(&ci->i_ceph_lock);
860 if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
861 spin_unlock(&ci->i_ceph_lock);
862 return;
863 }
864 di->offset = ceph_inode(inode)->i_max_offset++;
865 spin_unlock(&ci->i_ceph_lock);
866
867 spin_lock(&dir->d_lock);
868 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
869 list_move(&dn->d_u.d_child, &dir->d_subdirs);
870 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
871 dn->d_u.d_child.prev, dn->d_u.d_child.next);
872 spin_unlock(&dn->d_lock);
873 spin_unlock(&dir->d_lock);
874 }
875
876 /*
877 * splice a dentry to an inode.
878 * caller must hold directory i_mutex for this to be safe.
879 *
880 * we will only rehash the resulting dentry if @prehash is
881 * true; @prehash will be set to false (for the benefit of
882 * the caller) if we fail.
883 */
884 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
885 bool *prehash, bool set_offset)
886 {
887 struct dentry *realdn;
888
889 BUG_ON(dn->d_inode);
890
891 /* dn must be unhashed */
892 if (!d_unhashed(dn))
893 d_drop(dn);
894 realdn = d_materialise_unique(dn, in);
895 if (IS_ERR(realdn)) {
896 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
897 PTR_ERR(realdn), dn, in, ceph_vinop(in));
898 if (prehash)
899 *prehash = false; /* don't rehash on error */
900 dn = realdn; /* note realdn contains the error */
901 goto out;
902 } else if (realdn) {
903 dout("dn %p (%d) spliced with %p (%d) "
904 "inode %p ino %llx.%llx\n",
905 dn, dn->d_count,
906 realdn, realdn->d_count,
907 realdn->d_inode, ceph_vinop(realdn->d_inode));
908 dput(dn);
909 dn = realdn;
910 } else {
911 BUG_ON(!ceph_dentry(dn));
912 dout("dn %p attached to %p ino %llx.%llx\n",
913 dn, dn->d_inode, ceph_vinop(dn->d_inode));
914 }
915 if ((!prehash || *prehash) && d_unhashed(dn))
916 d_rehash(dn);
917 if (set_offset)
918 ceph_set_dentry_offset(dn);
919 out:
920 return dn;
921 }
922
923 /*
924 * Incorporate results into the local cache. This is either just
925 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
926 * after a lookup).
927 *
928 * A reply may contain
929 * a directory inode along with a dentry.
930 * and/or a target inode
931 *
932 * Called with snap_rwsem (read).
933 */
934 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
935 struct ceph_mds_session *session)
936 {
937 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
938 struct inode *in = NULL;
939 struct ceph_mds_reply_inode *ininfo;
940 struct ceph_vino vino;
941 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
942 int i = 0;
943 int err = 0;
944
945 dout("fill_trace %p is_dentry %d is_target %d\n", req,
946 rinfo->head->is_dentry, rinfo->head->is_target);
947
948 #if 0
949 /*
950 * Debugging hook:
951 *
952 * If we resend completed ops to a recovering mds, we get no
953 * trace. Since that is very rare, pretend this is the case
954 * to ensure the 'no trace' handlers in the callers behave.
955 *
956 * Fill in inodes unconditionally to avoid breaking cap
957 * invariants.
958 */
959 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
960 pr_info("fill_trace faking empty trace on %lld %s\n",
961 req->r_tid, ceph_mds_op_name(rinfo->head->op));
962 if (rinfo->head->is_dentry) {
963 rinfo->head->is_dentry = 0;
964 err = fill_inode(req->r_locked_dir,
965 &rinfo->diri, rinfo->dirfrag,
966 session, req->r_request_started, -1);
967 }
968 if (rinfo->head->is_target) {
969 rinfo->head->is_target = 0;
970 ininfo = rinfo->targeti.in;
971 vino.ino = le64_to_cpu(ininfo->ino);
972 vino.snap = le64_to_cpu(ininfo->snapid);
973 in = ceph_get_inode(sb, vino);
974 err = fill_inode(in, &rinfo->targeti, NULL,
975 session, req->r_request_started,
976 req->r_fmode);
977 iput(in);
978 }
979 }
980 #endif
981
982 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
983 dout("fill_trace reply is empty!\n");
984 if (rinfo->head->result == 0 && req->r_locked_dir)
985 ceph_invalidate_dir_request(req);
986 return 0;
987 }
988
989 if (rinfo->head->is_dentry) {
990 struct inode *dir = req->r_locked_dir;
991
992 if (dir) {
993 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
994 session, req->r_request_started, -1,
995 &req->r_caps_reservation);
996 if (err < 0)
997 return err;
998 } else {
999 WARN_ON_ONCE(1);
1000 }
1001 }
1002
1003 /*
1004 * ignore null lease/binding on snapdir ENOENT, or else we
1005 * will have trouble splicing in the virtual snapdir later
1006 */
1007 if (rinfo->head->is_dentry && !req->r_aborted &&
1008 req->r_locked_dir &&
1009 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1010 fsc->mount_options->snapdir_name,
1011 req->r_dentry->d_name.len))) {
1012 /*
1013 * lookup link rename : null -> possibly existing inode
1014 * mknod symlink mkdir : null -> new inode
1015 * unlink : linked -> null
1016 */
1017 struct inode *dir = req->r_locked_dir;
1018 struct dentry *dn = req->r_dentry;
1019 bool have_dir_cap, have_lease;
1020
1021 BUG_ON(!dn);
1022 BUG_ON(!dir);
1023 BUG_ON(dn->d_parent->d_inode != dir);
1024 BUG_ON(ceph_ino(dir) !=
1025 le64_to_cpu(rinfo->diri.in->ino));
1026 BUG_ON(ceph_snap(dir) !=
1027 le64_to_cpu(rinfo->diri.in->snapid));
1028
1029 /* do we have a lease on the whole dir? */
1030 have_dir_cap =
1031 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1032 CEPH_CAP_FILE_SHARED);
1033
1034 /* do we have a dn lease? */
1035 have_lease = have_dir_cap ||
1036 le32_to_cpu(rinfo->dlease->duration_ms);
1037 if (!have_lease)
1038 dout("fill_trace no dentry lease or dir cap\n");
1039
1040 /* rename? */
1041 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
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 dout("fill_trace doing d_move %p -> %p\n",
1048 req->r_old_dentry, dn);
1049
1050 d_move(req->r_old_dentry, dn);
1051 dout(" src %p '%.*s' dst %p '%.*s'\n",
1052 req->r_old_dentry,
1053 req->r_old_dentry->d_name.len,
1054 req->r_old_dentry->d_name.name,
1055 dn, dn->d_name.len, dn->d_name.name);
1056
1057 /* ensure target dentry is invalidated, despite
1058 rehashing bug in vfs_rename_dir */
1059 ceph_invalidate_dentry_lease(dn);
1060
1061 /*
1062 * d_move() puts the renamed dentry at the end of
1063 * d_subdirs. We need to assign it an appropriate
1064 * directory offset so we can behave when holding
1065 * I_COMPLETE.
1066 */
1067 ceph_set_dentry_offset(req->r_old_dentry);
1068 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1069 ceph_dentry(req->r_old_dentry)->offset);
1070
1071 dn = req->r_old_dentry; /* use old_dentry */
1072 in = dn->d_inode;
1073 }
1074
1075 /* null dentry? */
1076 if (!rinfo->head->is_target) {
1077 dout("fill_trace null dentry\n");
1078 if (dn->d_inode) {
1079 dout("d_delete %p\n", dn);
1080 d_delete(dn);
1081 } else {
1082 dout("d_instantiate %p NULL\n", dn);
1083 d_instantiate(dn, NULL);
1084 if (have_lease && d_unhashed(dn))
1085 d_rehash(dn);
1086 update_dentry_lease(dn, rinfo->dlease,
1087 session,
1088 req->r_request_started);
1089 }
1090 goto done;
1091 }
1092
1093 /* attach proper inode */
1094 ininfo = rinfo->targeti.in;
1095 vino.ino = le64_to_cpu(ininfo->ino);
1096 vino.snap = le64_to_cpu(ininfo->snapid);
1097 in = dn->d_inode;
1098 if (!in) {
1099 in = ceph_get_inode(sb, vino);
1100 if (IS_ERR(in)) {
1101 pr_err("fill_trace bad get_inode "
1102 "%llx.%llx\n", vino.ino, vino.snap);
1103 err = PTR_ERR(in);
1104 d_drop(dn);
1105 goto done;
1106 }
1107 dn = splice_dentry(dn, in, &have_lease, true);
1108 if (IS_ERR(dn)) {
1109 err = PTR_ERR(dn);
1110 goto done;
1111 }
1112 req->r_dentry = dn; /* may have spliced */
1113 ihold(in);
1114 } else if (ceph_ino(in) == vino.ino &&
1115 ceph_snap(in) == vino.snap) {
1116 ihold(in);
1117 } else {
1118 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1119 dn, in, ceph_ino(in), ceph_snap(in),
1120 vino.ino, vino.snap);
1121 have_lease = false;
1122 in = NULL;
1123 }
1124
1125 if (have_lease)
1126 update_dentry_lease(dn, rinfo->dlease, session,
1127 req->r_request_started);
1128 dout(" final dn %p\n", dn);
1129 i++;
1130 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1131 req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
1132 struct dentry *dn = req->r_dentry;
1133
1134 /* fill out a snapdir LOOKUPSNAP dentry */
1135 BUG_ON(!dn);
1136 BUG_ON(!req->r_locked_dir);
1137 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1138 ininfo = rinfo->targeti.in;
1139 vino.ino = le64_to_cpu(ininfo->ino);
1140 vino.snap = le64_to_cpu(ininfo->snapid);
1141 in = ceph_get_inode(sb, vino);
1142 if (IS_ERR(in)) {
1143 pr_err("fill_inode get_inode badness %llx.%llx\n",
1144 vino.ino, vino.snap);
1145 err = PTR_ERR(in);
1146 d_delete(dn);
1147 goto done;
1148 }
1149 dout(" linking snapped dir %p to dn %p\n", in, dn);
1150 dn = splice_dentry(dn, in, NULL, true);
1151 if (IS_ERR(dn)) {
1152 err = PTR_ERR(dn);
1153 goto done;
1154 }
1155 req->r_dentry = dn; /* may have spliced */
1156 ihold(in);
1157 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1158 }
1159
1160 if (rinfo->head->is_target) {
1161 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1162 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1163
1164 if (in == NULL || ceph_ino(in) != vino.ino ||
1165 ceph_snap(in) != vino.snap) {
1166 in = ceph_get_inode(sb, vino);
1167 if (IS_ERR(in)) {
1168 err = PTR_ERR(in);
1169 goto done;
1170 }
1171 }
1172 req->r_target_inode = in;
1173
1174 err = fill_inode(in,
1175 &rinfo->targeti, NULL,
1176 session, req->r_request_started,
1177 (le32_to_cpu(rinfo->head->result) == 0) ?
1178 req->r_fmode : -1,
1179 &req->r_caps_reservation);
1180 if (err < 0) {
1181 pr_err("fill_inode badness %p %llx.%llx\n",
1182 in, ceph_vinop(in));
1183 goto done;
1184 }
1185 }
1186
1187 done:
1188 dout("fill_trace done err=%d\n", err);
1189 return err;
1190 }
1191
1192 /*
1193 * Prepopulate our cache with readdir results, leases, etc.
1194 */
1195 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1196 struct ceph_mds_session *session)
1197 {
1198 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1199 int i, err = 0;
1200
1201 for (i = 0; i < rinfo->dir_nr; i++) {
1202 struct ceph_vino vino;
1203 struct inode *in;
1204 int rc;
1205
1206 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1207 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1208
1209 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1210 if (IS_ERR(in)) {
1211 err = PTR_ERR(in);
1212 dout("new_inode badness got %d\n", err);
1213 continue;
1214 }
1215 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1216 req->r_request_started, -1,
1217 &req->r_caps_reservation);
1218 if (rc < 0) {
1219 pr_err("fill_inode badness on %p got %d\n", in, rc);
1220 err = rc;
1221 continue;
1222 }
1223 }
1224
1225 return err;
1226 }
1227
1228 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1229 struct ceph_mds_session *session)
1230 {
1231 struct dentry *parent = req->r_dentry;
1232 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1233 struct qstr dname;
1234 struct dentry *dn;
1235 struct inode *in;
1236 int err = 0, i;
1237 struct inode *snapdir = NULL;
1238 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1239 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1240 struct ceph_dentry_info *di;
1241
1242 if (req->r_aborted)
1243 return readdir_prepopulate_inodes_only(req, session);
1244
1245 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1246 snapdir = ceph_get_snapdir(parent->d_inode);
1247 parent = d_find_alias(snapdir);
1248 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1249 rinfo->dir_nr, parent);
1250 } else {
1251 dout("readdir_prepopulate %d items under dn %p\n",
1252 rinfo->dir_nr, parent);
1253 if (rinfo->dir_dir)
1254 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1255 }
1256
1257 for (i = 0; i < rinfo->dir_nr; i++) {
1258 struct ceph_vino vino;
1259
1260 dname.name = rinfo->dir_dname[i];
1261 dname.len = rinfo->dir_dname_len[i];
1262 dname.hash = full_name_hash(dname.name, dname.len);
1263
1264 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1265 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1266
1267 retry_lookup:
1268 dn = d_lookup(parent, &dname);
1269 dout("d_lookup on parent=%p name=%.*s got %p\n",
1270 parent, dname.len, dname.name, dn);
1271
1272 if (!dn) {
1273 dn = d_alloc(parent, &dname);
1274 dout("d_alloc %p '%.*s' = %p\n", parent,
1275 dname.len, dname.name, dn);
1276 if (dn == NULL) {
1277 dout("d_alloc badness\n");
1278 err = -ENOMEM;
1279 goto out;
1280 }
1281 err = ceph_init_dentry(dn);
1282 if (err < 0) {
1283 dput(dn);
1284 goto out;
1285 }
1286 } else if (dn->d_inode &&
1287 (ceph_ino(dn->d_inode) != vino.ino ||
1288 ceph_snap(dn->d_inode) != vino.snap)) {
1289 dout(" dn %p points to wrong inode %p\n",
1290 dn, dn->d_inode);
1291 d_delete(dn);
1292 dput(dn);
1293 goto retry_lookup;
1294 } else {
1295 /* reorder parent's d_subdirs */
1296 spin_lock(&parent->d_lock);
1297 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1298 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1299 spin_unlock(&dn->d_lock);
1300 spin_unlock(&parent->d_lock);
1301 }
1302
1303 di = dn->d_fsdata;
1304 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1305
1306 /* inode */
1307 if (dn->d_inode) {
1308 in = dn->d_inode;
1309 } else {
1310 in = ceph_get_inode(parent->d_sb, vino);
1311 if (IS_ERR(in)) {
1312 dout("new_inode badness\n");
1313 d_drop(dn);
1314 dput(dn);
1315 err = PTR_ERR(in);
1316 goto out;
1317 }
1318 dn = splice_dentry(dn, in, NULL, false);
1319 if (IS_ERR(dn))
1320 dn = NULL;
1321 }
1322
1323 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1324 req->r_request_started, -1,
1325 &req->r_caps_reservation) < 0) {
1326 pr_err("fill_inode badness on %p\n", in);
1327 goto next_item;
1328 }
1329 if (dn)
1330 update_dentry_lease(dn, rinfo->dir_dlease[i],
1331 req->r_session,
1332 req->r_request_started);
1333 next_item:
1334 if (dn)
1335 dput(dn);
1336 }
1337 req->r_did_prepopulate = true;
1338
1339 out:
1340 if (snapdir) {
1341 iput(snapdir);
1342 dput(parent);
1343 }
1344 dout("readdir_prepopulate done\n");
1345 return err;
1346 }
1347
1348 int ceph_inode_set_size(struct inode *inode, loff_t size)
1349 {
1350 struct ceph_inode_info *ci = ceph_inode(inode);
1351 int ret = 0;
1352
1353 spin_lock(&ci->i_ceph_lock);
1354 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1355 inode->i_size = size;
1356 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1357
1358 /* tell the MDS if we are approaching max_size */
1359 if ((size << 1) >= ci->i_max_size &&
1360 (ci->i_reported_size << 1) < ci->i_max_size)
1361 ret = 1;
1362
1363 spin_unlock(&ci->i_ceph_lock);
1364 return ret;
1365 }
1366
1367 /*
1368 * Write back inode data in a worker thread. (This can't be done
1369 * in the message handler context.)
1370 */
1371 void ceph_queue_writeback(struct inode *inode)
1372 {
1373 ihold(inode);
1374 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1375 &ceph_inode(inode)->i_wb_work)) {
1376 dout("ceph_queue_writeback %p\n", inode);
1377 } else {
1378 dout("ceph_queue_writeback %p failed\n", inode);
1379 iput(inode);
1380 }
1381 }
1382
1383 static void ceph_writeback_work(struct work_struct *work)
1384 {
1385 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1386 i_wb_work);
1387 struct inode *inode = &ci->vfs_inode;
1388
1389 dout("writeback %p\n", inode);
1390 filemap_fdatawrite(&inode->i_data);
1391 iput(inode);
1392 }
1393
1394 /*
1395 * queue an async invalidation
1396 */
1397 void ceph_queue_invalidate(struct inode *inode)
1398 {
1399 ihold(inode);
1400 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1401 &ceph_inode(inode)->i_pg_inv_work)) {
1402 dout("ceph_queue_invalidate %p\n", inode);
1403 } else {
1404 dout("ceph_queue_invalidate %p failed\n", inode);
1405 iput(inode);
1406 }
1407 }
1408
1409 /*
1410 * Invalidate inode pages in a worker thread. (This can't be done
1411 * in the message handler context.)
1412 */
1413 static void ceph_invalidate_work(struct work_struct *work)
1414 {
1415 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1416 i_pg_inv_work);
1417 struct inode *inode = &ci->vfs_inode;
1418 u32 orig_gen;
1419 int check = 0;
1420
1421 spin_lock(&ci->i_ceph_lock);
1422 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1423 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1424 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1425 /* nevermind! */
1426 spin_unlock(&ci->i_ceph_lock);
1427 goto out;
1428 }
1429 orig_gen = ci->i_rdcache_gen;
1430 spin_unlock(&ci->i_ceph_lock);
1431
1432 truncate_inode_pages(&inode->i_data, 0);
1433
1434 spin_lock(&ci->i_ceph_lock);
1435 if (orig_gen == ci->i_rdcache_gen &&
1436 orig_gen == ci->i_rdcache_revoking) {
1437 dout("invalidate_pages %p gen %d successful\n", inode,
1438 ci->i_rdcache_gen);
1439 ci->i_rdcache_revoking--;
1440 check = 1;
1441 } else {
1442 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1443 inode, orig_gen, ci->i_rdcache_gen,
1444 ci->i_rdcache_revoking);
1445 }
1446 spin_unlock(&ci->i_ceph_lock);
1447
1448 if (check)
1449 ceph_check_caps(ci, 0, NULL);
1450 out:
1451 iput(inode);
1452 }
1453
1454
1455 /*
1456 * called by trunc_wq; take i_mutex ourselves
1457 *
1458 * We also truncate in a separate thread as well.
1459 */
1460 static void ceph_vmtruncate_work(struct work_struct *work)
1461 {
1462 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1463 i_vmtruncate_work);
1464 struct inode *inode = &ci->vfs_inode;
1465
1466 dout("vmtruncate_work %p\n", inode);
1467 mutex_lock(&inode->i_mutex);
1468 __ceph_do_pending_vmtruncate(inode);
1469 mutex_unlock(&inode->i_mutex);
1470 iput(inode);
1471 }
1472
1473 /*
1474 * Queue an async vmtruncate. If we fail to queue work, we will handle
1475 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1476 */
1477 void ceph_queue_vmtruncate(struct inode *inode)
1478 {
1479 struct ceph_inode_info *ci = ceph_inode(inode);
1480
1481 ihold(inode);
1482 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1483 &ci->i_vmtruncate_work)) {
1484 dout("ceph_queue_vmtruncate %p\n", inode);
1485 } else {
1486 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1487 inode, ci->i_truncate_pending);
1488 iput(inode);
1489 }
1490 }
1491
1492 /*
1493 * called with i_mutex held.
1494 *
1495 * Make sure any pending truncation is applied before doing anything
1496 * that may depend on it.
1497 */
1498 void __ceph_do_pending_vmtruncate(struct inode *inode)
1499 {
1500 struct ceph_inode_info *ci = ceph_inode(inode);
1501 u64 to;
1502 int wrbuffer_refs, finish = 0;
1503
1504 retry:
1505 spin_lock(&ci->i_ceph_lock);
1506 if (ci->i_truncate_pending == 0) {
1507 dout("__do_pending_vmtruncate %p none pending\n", inode);
1508 spin_unlock(&ci->i_ceph_lock);
1509 return;
1510 }
1511
1512 /*
1513 * make sure any dirty snapped pages are flushed before we
1514 * possibly truncate them.. so write AND block!
1515 */
1516 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1517 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1518 inode);
1519 spin_unlock(&ci->i_ceph_lock);
1520 filemap_write_and_wait_range(&inode->i_data, 0,
1521 inode->i_sb->s_maxbytes);
1522 goto retry;
1523 }
1524
1525 to = ci->i_truncate_size;
1526 wrbuffer_refs = ci->i_wrbuffer_ref;
1527 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1528 ci->i_truncate_pending, to);
1529 spin_unlock(&ci->i_ceph_lock);
1530
1531 truncate_inode_pages(inode->i_mapping, to);
1532
1533 spin_lock(&ci->i_ceph_lock);
1534 if (to == ci->i_truncate_size) {
1535 ci->i_truncate_pending = 0;
1536 finish = 1;
1537 }
1538 spin_unlock(&ci->i_ceph_lock);
1539 if (!finish)
1540 goto retry;
1541
1542 if (wrbuffer_refs == 0)
1543 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1544
1545 wake_up_all(&ci->i_cap_wq);
1546 }
1547
1548
1549 /*
1550 * symlinks
1551 */
1552 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1553 {
1554 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1555 nd_set_link(nd, ci->i_symlink);
1556 return NULL;
1557 }
1558
1559 static const struct inode_operations ceph_symlink_iops = {
1560 .readlink = generic_readlink,
1561 .follow_link = ceph_sym_follow_link,
1562 };
1563
1564 /*
1565 * setattr
1566 */
1567 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1568 {
1569 struct inode *inode = dentry->d_inode;
1570 struct ceph_inode_info *ci = ceph_inode(inode);
1571 struct inode *parent_inode;
1572 const unsigned int ia_valid = attr->ia_valid;
1573 struct ceph_mds_request *req;
1574 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1575 int issued;
1576 int release = 0, dirtied = 0;
1577 int mask = 0;
1578 int err = 0;
1579 int inode_dirty_flags = 0;
1580
1581 if (ceph_snap(inode) != CEPH_NOSNAP)
1582 return -EROFS;
1583
1584 __ceph_do_pending_vmtruncate(inode);
1585
1586 err = inode_change_ok(inode, attr);
1587 if (err != 0)
1588 return err;
1589
1590 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1591 USE_AUTH_MDS);
1592 if (IS_ERR(req))
1593 return PTR_ERR(req);
1594
1595 spin_lock(&ci->i_ceph_lock);
1596 issued = __ceph_caps_issued(ci, NULL);
1597 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1598
1599 if (ia_valid & ATTR_UID) {
1600 dout("setattr %p uid %d -> %d\n", inode,
1601 from_kuid(&init_user_ns, inode->i_uid),
1602 from_kuid(&init_user_ns, attr->ia_uid));
1603 if (issued & CEPH_CAP_AUTH_EXCL) {
1604 inode->i_uid = attr->ia_uid;
1605 dirtied |= CEPH_CAP_AUTH_EXCL;
1606 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1607 !uid_eq(attr->ia_uid, inode->i_uid)) {
1608 req->r_args.setattr.uid = cpu_to_le32(
1609 from_kuid(&init_user_ns, attr->ia_uid));
1610 mask |= CEPH_SETATTR_UID;
1611 release |= CEPH_CAP_AUTH_SHARED;
1612 }
1613 }
1614 if (ia_valid & ATTR_GID) {
1615 dout("setattr %p gid %d -> %d\n", inode,
1616 from_kgid(&init_user_ns, inode->i_gid),
1617 from_kgid(&init_user_ns, attr->ia_gid));
1618 if (issued & CEPH_CAP_AUTH_EXCL) {
1619 inode->i_gid = attr->ia_gid;
1620 dirtied |= CEPH_CAP_AUTH_EXCL;
1621 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1622 !gid_eq(attr->ia_gid, inode->i_gid)) {
1623 req->r_args.setattr.gid = cpu_to_le32(
1624 from_kgid(&init_user_ns, attr->ia_gid));
1625 mask |= CEPH_SETATTR_GID;
1626 release |= CEPH_CAP_AUTH_SHARED;
1627 }
1628 }
1629 if (ia_valid & ATTR_MODE) {
1630 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1631 attr->ia_mode);
1632 if (issued & CEPH_CAP_AUTH_EXCL) {
1633 inode->i_mode = attr->ia_mode;
1634 dirtied |= CEPH_CAP_AUTH_EXCL;
1635 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1636 attr->ia_mode != inode->i_mode) {
1637 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1638 mask |= CEPH_SETATTR_MODE;
1639 release |= CEPH_CAP_AUTH_SHARED;
1640 }
1641 }
1642
1643 if (ia_valid & ATTR_ATIME) {
1644 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1645 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1646 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1647 if (issued & CEPH_CAP_FILE_EXCL) {
1648 ci->i_time_warp_seq++;
1649 inode->i_atime = attr->ia_atime;
1650 dirtied |= CEPH_CAP_FILE_EXCL;
1651 } else if ((issued & CEPH_CAP_FILE_WR) &&
1652 timespec_compare(&inode->i_atime,
1653 &attr->ia_atime) < 0) {
1654 inode->i_atime = attr->ia_atime;
1655 dirtied |= CEPH_CAP_FILE_WR;
1656 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1657 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1658 ceph_encode_timespec(&req->r_args.setattr.atime,
1659 &attr->ia_atime);
1660 mask |= CEPH_SETATTR_ATIME;
1661 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1662 CEPH_CAP_FILE_WR;
1663 }
1664 }
1665 if (ia_valid & ATTR_MTIME) {
1666 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1667 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1668 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1669 if (issued & CEPH_CAP_FILE_EXCL) {
1670 ci->i_time_warp_seq++;
1671 inode->i_mtime = attr->ia_mtime;
1672 dirtied |= CEPH_CAP_FILE_EXCL;
1673 } else if ((issued & CEPH_CAP_FILE_WR) &&
1674 timespec_compare(&inode->i_mtime,
1675 &attr->ia_mtime) < 0) {
1676 inode->i_mtime = attr->ia_mtime;
1677 dirtied |= CEPH_CAP_FILE_WR;
1678 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1679 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1680 ceph_encode_timespec(&req->r_args.setattr.mtime,
1681 &attr->ia_mtime);
1682 mask |= CEPH_SETATTR_MTIME;
1683 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1684 CEPH_CAP_FILE_WR;
1685 }
1686 }
1687 if (ia_valid & ATTR_SIZE) {
1688 dout("setattr %p size %lld -> %lld\n", inode,
1689 inode->i_size, attr->ia_size);
1690 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1691 err = -EINVAL;
1692 goto out;
1693 }
1694 if ((issued & CEPH_CAP_FILE_EXCL) &&
1695 attr->ia_size > inode->i_size) {
1696 inode->i_size = attr->ia_size;
1697 inode->i_blocks =
1698 (attr->ia_size + (1 << 9) - 1) >> 9;
1699 inode->i_ctime = attr->ia_ctime;
1700 ci->i_reported_size = attr->ia_size;
1701 dirtied |= CEPH_CAP_FILE_EXCL;
1702 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1703 attr->ia_size != inode->i_size) {
1704 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1705 req->r_args.setattr.old_size =
1706 cpu_to_le64(inode->i_size);
1707 mask |= CEPH_SETATTR_SIZE;
1708 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1709 CEPH_CAP_FILE_WR;
1710 }
1711 }
1712
1713 /* these do nothing */
1714 if (ia_valid & ATTR_CTIME) {
1715 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1716 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1717 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1718 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1719 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1720 only ? "ctime only" : "ignored");
1721 inode->i_ctime = attr->ia_ctime;
1722 if (only) {
1723 /*
1724 * if kernel wants to dirty ctime but nothing else,
1725 * we need to choose a cap to dirty under, or do
1726 * a almost-no-op setattr
1727 */
1728 if (issued & CEPH_CAP_AUTH_EXCL)
1729 dirtied |= CEPH_CAP_AUTH_EXCL;
1730 else if (issued & CEPH_CAP_FILE_EXCL)
1731 dirtied |= CEPH_CAP_FILE_EXCL;
1732 else if (issued & CEPH_CAP_XATTR_EXCL)
1733 dirtied |= CEPH_CAP_XATTR_EXCL;
1734 else
1735 mask |= CEPH_SETATTR_CTIME;
1736 }
1737 }
1738 if (ia_valid & ATTR_FILE)
1739 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1740
1741 if (dirtied) {
1742 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1743 inode->i_ctime = CURRENT_TIME;
1744 }
1745
1746 release &= issued;
1747 spin_unlock(&ci->i_ceph_lock);
1748
1749 if (inode_dirty_flags)
1750 __mark_inode_dirty(inode, inode_dirty_flags);
1751
1752 if (mask) {
1753 req->r_inode = inode;
1754 ihold(inode);
1755 req->r_inode_drop = release;
1756 req->r_args.setattr.mask = cpu_to_le32(mask);
1757 req->r_num_caps = 1;
1758 parent_inode = ceph_get_dentry_parent_inode(dentry);
1759 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1760 iput(parent_inode);
1761 }
1762 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1763 ceph_cap_string(dirtied), mask);
1764
1765 ceph_mdsc_put_request(req);
1766 __ceph_do_pending_vmtruncate(inode);
1767 return err;
1768 out:
1769 spin_unlock(&ci->i_ceph_lock);
1770 ceph_mdsc_put_request(req);
1771 return err;
1772 }
1773
1774 /*
1775 * Verify that we have a lease on the given mask. If not,
1776 * do a getattr against an mds.
1777 */
1778 int ceph_do_getattr(struct inode *inode, int mask)
1779 {
1780 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1781 struct ceph_mds_client *mdsc = fsc->mdsc;
1782 struct ceph_mds_request *req;
1783 int err;
1784
1785 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1786 dout("do_getattr inode %p SNAPDIR\n", inode);
1787 return 0;
1788 }
1789
1790 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1791 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1792 return 0;
1793
1794 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1795 if (IS_ERR(req))
1796 return PTR_ERR(req);
1797 req->r_inode = inode;
1798 ihold(inode);
1799 req->r_num_caps = 1;
1800 req->r_args.getattr.mask = cpu_to_le32(mask);
1801 err = ceph_mdsc_do_request(mdsc, NULL, req);
1802 ceph_mdsc_put_request(req);
1803 dout("do_getattr result=%d\n", err);
1804 return err;
1805 }
1806
1807
1808 /*
1809 * Check inode permissions. We verify we have a valid value for
1810 * the AUTH cap, then call the generic handler.
1811 */
1812 int ceph_permission(struct inode *inode, int mask)
1813 {
1814 int err;
1815
1816 if (mask & MAY_NOT_BLOCK)
1817 return -ECHILD;
1818
1819 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1820
1821 if (!err)
1822 err = generic_permission(inode, mask);
1823 return err;
1824 }
1825
1826 /*
1827 * Get all attributes. Hopefully somedata we'll have a statlite()
1828 * and can limit the fields we require to be accurate.
1829 */
1830 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1831 struct kstat *stat)
1832 {
1833 struct inode *inode = dentry->d_inode;
1834 struct ceph_inode_info *ci = ceph_inode(inode);
1835 int err;
1836
1837 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1838 if (!err) {
1839 generic_fillattr(inode, stat);
1840 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1841 if (ceph_snap(inode) != CEPH_NOSNAP)
1842 stat->dev = ceph_snap(inode);
1843 else
1844 stat->dev = 0;
1845 if (S_ISDIR(inode->i_mode)) {
1846 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1847 RBYTES))
1848 stat->size = ci->i_rbytes;
1849 else
1850 stat->size = ci->i_files + ci->i_subdirs;
1851 stat->blocks = 0;
1852 stat->blksize = 65536;
1853 }
1854 }
1855 return err;
1856 }
Linux kernel - Deliverables
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