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ceph: fix directory fsync
[deliverable/linux.git] / fs / ceph / dir.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
8
9 #include "super.h"
10 #include "mds_client.h"
11
12 /*
13 * Directory operations: readdir, lookup, create, link, unlink,
14 * rename, etc.
15 */
16
17 /*
18 * Ceph MDS operations are specified in terms of a base ino and
19 * relative path. Thus, the client can specify an operation on a
20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
21 * relative to, say, the root directory.
22 *
23 * Normally, we limit ourselves to strict inode ops (no path component)
24 * or dentry operations (a single path component relative to an ino). The
25 * exception to this is open_root_dentry(), which will open the mount
26 * point by name.
27 */
28
29 const struct dentry_operations ceph_dentry_ops;
30
31 /*
32 * Initialize ceph dentry state.
33 */
34 int ceph_init_dentry(struct dentry *dentry)
35 {
36 struct ceph_dentry_info *di;
37
38 if (dentry->d_fsdata)
39 return 0;
40
41 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
42 if (!di)
43 return -ENOMEM; /* oh well */
44
45 spin_lock(&dentry->d_lock);
46 if (dentry->d_fsdata) {
47 /* lost a race */
48 kmem_cache_free(ceph_dentry_cachep, di);
49 goto out_unlock;
50 }
51
52 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP)
53 d_set_d_op(dentry, &ceph_dentry_ops);
54 else if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR)
55 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
56 else
57 d_set_d_op(dentry, &ceph_snap_dentry_ops);
58
59 di->dentry = dentry;
60 di->lease_session = NULL;
61 dentry->d_time = jiffies;
62 /* avoid reordering d_fsdata setup so that the check above is safe */
63 smp_mb();
64 dentry->d_fsdata = di;
65 ceph_dentry_lru_add(dentry);
66 out_unlock:
67 spin_unlock(&dentry->d_lock);
68 return 0;
69 }
70
71 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
72 {
73 struct inode *inode = NULL;
74
75 if (!dentry)
76 return NULL;
77
78 spin_lock(&dentry->d_lock);
79 if (!IS_ROOT(dentry)) {
80 inode = d_inode(dentry->d_parent);
81 ihold(inode);
82 }
83 spin_unlock(&dentry->d_lock);
84 return inode;
85 }
86
87
88 /*
89 * for readdir, we encode the directory frag and offset within that
90 * frag into f_pos.
91 */
92 static unsigned fpos_frag(loff_t p)
93 {
94 return p >> 32;
95 }
96 static unsigned fpos_off(loff_t p)
97 {
98 return p & 0xffffffff;
99 }
100
101 static int fpos_cmp(loff_t l, loff_t r)
102 {
103 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
104 if (v)
105 return v;
106 return (int)(fpos_off(l) - fpos_off(r));
107 }
108
109 /*
110 * When possible, we try to satisfy a readdir by peeking at the
111 * dcache. We make this work by carefully ordering dentries on
112 * d_child when we initially get results back from the MDS, and
113 * falling back to a "normal" sync readdir if any dentries in the dir
114 * are dropped.
115 *
116 * Complete dir indicates that we have all dentries in the dir. It is
117 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
118 * the MDS if/when the directory is modified).
119 */
120 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
121 u32 shared_gen)
122 {
123 struct ceph_file_info *fi = file->private_data;
124 struct dentry *parent = file->f_path.dentry;
125 struct inode *dir = d_inode(parent);
126 struct list_head *p;
127 struct dentry *dentry, *last;
128 struct ceph_dentry_info *di;
129 int err = 0;
130
131 /* claim ref on last dentry we returned */
132 last = fi->dentry;
133 fi->dentry = NULL;
134
135 dout("__dcache_readdir %p v%u at %llu (last %p)\n",
136 dir, shared_gen, ctx->pos, last);
137
138 spin_lock(&parent->d_lock);
139
140 /* start at beginning? */
141 if (ctx->pos == 2 || last == NULL ||
142 fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) {
143 if (list_empty(&parent->d_subdirs))
144 goto out_unlock;
145 p = parent->d_subdirs.prev;
146 dout(" initial p %p/%p\n", p->prev, p->next);
147 } else {
148 p = last->d_child.prev;
149 }
150
151 more:
152 dentry = list_entry(p, struct dentry, d_child);
153 di = ceph_dentry(dentry);
154 while (1) {
155 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
156 d_unhashed(dentry) ? "!hashed" : "hashed",
157 parent->d_subdirs.prev, parent->d_subdirs.next);
158 if (p == &parent->d_subdirs) {
159 fi->flags |= CEPH_F_ATEND;
160 goto out_unlock;
161 }
162 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
163 if (di->lease_shared_gen == shared_gen &&
164 !d_unhashed(dentry) && d_really_is_positive(dentry) &&
165 ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR &&
166 ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH &&
167 fpos_cmp(ctx->pos, di->offset) <= 0)
168 break;
169 dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry,
170 dentry, di->offset,
171 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
172 !d_inode(dentry) ? " null" : "");
173 spin_unlock(&dentry->d_lock);
174 p = p->prev;
175 dentry = list_entry(p, struct dentry, d_child);
176 di = ceph_dentry(dentry);
177 }
178
179 dget_dlock(dentry);
180 spin_unlock(&dentry->d_lock);
181 spin_unlock(&parent->d_lock);
182
183 /* make sure a dentry wasn't dropped while we didn't have parent lock */
184 if (!ceph_dir_is_complete_ordered(dir)) {
185 dout(" lost dir complete on %p; falling back to mds\n", dir);
186 dput(dentry);
187 err = -EAGAIN;
188 goto out;
189 }
190
191 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
192 dentry, dentry, d_inode(dentry));
193 if (!dir_emit(ctx, dentry->d_name.name,
194 dentry->d_name.len,
195 ceph_translate_ino(dentry->d_sb, d_inode(dentry)->i_ino),
196 d_inode(dentry)->i_mode >> 12)) {
197 if (last) {
198 /* remember our position */
199 fi->dentry = last;
200 fi->next_offset = fpos_off(di->offset);
201 }
202 dput(dentry);
203 return 0;
204 }
205
206 ctx->pos = di->offset + 1;
207
208 if (last)
209 dput(last);
210 last = dentry;
211
212 spin_lock(&parent->d_lock);
213 p = p->prev; /* advance to next dentry */
214 goto more;
215
216 out_unlock:
217 spin_unlock(&parent->d_lock);
218 out:
219 if (last)
220 dput(last);
221 return err;
222 }
223
224 /*
225 * make note of the last dentry we read, so we can
226 * continue at the same lexicographical point,
227 * regardless of what dir changes take place on the
228 * server.
229 */
230 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
231 int len)
232 {
233 kfree(fi->last_name);
234 fi->last_name = kmalloc(len+1, GFP_NOFS);
235 if (!fi->last_name)
236 return -ENOMEM;
237 memcpy(fi->last_name, name, len);
238 fi->last_name[len] = 0;
239 dout("note_last_dentry '%s'\n", fi->last_name);
240 return 0;
241 }
242
243 static int ceph_readdir(struct file *file, struct dir_context *ctx)
244 {
245 struct ceph_file_info *fi = file->private_data;
246 struct inode *inode = file_inode(file);
247 struct ceph_inode_info *ci = ceph_inode(inode);
248 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
249 struct ceph_mds_client *mdsc = fsc->mdsc;
250 unsigned frag = fpos_frag(ctx->pos);
251 int off = fpos_off(ctx->pos);
252 int err;
253 u32 ftype;
254 struct ceph_mds_reply_info_parsed *rinfo;
255
256 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
257 if (fi->flags & CEPH_F_ATEND)
258 return 0;
259
260 /* always start with . and .. */
261 if (ctx->pos == 0) {
262 dout("readdir off 0 -> '.'\n");
263 if (!dir_emit(ctx, ".", 1,
264 ceph_translate_ino(inode->i_sb, inode->i_ino),
265 inode->i_mode >> 12))
266 return 0;
267 ctx->pos = 1;
268 off = 1;
269 }
270 if (ctx->pos == 1) {
271 ino_t ino = parent_ino(file->f_path.dentry);
272 dout("readdir off 1 -> '..'\n");
273 if (!dir_emit(ctx, "..", 2,
274 ceph_translate_ino(inode->i_sb, ino),
275 inode->i_mode >> 12))
276 return 0;
277 ctx->pos = 2;
278 off = 2;
279 }
280
281 /* can we use the dcache? */
282 spin_lock(&ci->i_ceph_lock);
283 if ((ctx->pos == 2 || fi->dentry) &&
284 ceph_test_mount_opt(fsc, DCACHE) &&
285 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
286 ceph_snap(inode) != CEPH_SNAPDIR &&
287 __ceph_dir_is_complete_ordered(ci) &&
288 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
289 u32 shared_gen = ci->i_shared_gen;
290 spin_unlock(&ci->i_ceph_lock);
291 err = __dcache_readdir(file, ctx, shared_gen);
292 if (err != -EAGAIN)
293 return err;
294 frag = fpos_frag(ctx->pos);
295 off = fpos_off(ctx->pos);
296 } else {
297 spin_unlock(&ci->i_ceph_lock);
298 }
299 if (fi->dentry) {
300 err = note_last_dentry(fi, fi->dentry->d_name.name,
301 fi->dentry->d_name.len);
302 if (err)
303 return err;
304 dput(fi->dentry);
305 fi->dentry = NULL;
306 }
307
308 /* proceed with a normal readdir */
309
310 if (ctx->pos == 2) {
311 /* note dir version at start of readdir so we can tell
312 * if any dentries get dropped */
313 fi->dir_release_count = atomic_read(&ci->i_release_count);
314 fi->dir_ordered_count = ci->i_ordered_count;
315 }
316
317 more:
318 /* do we have the correct frag content buffered? */
319 if (fi->frag != frag || fi->last_readdir == NULL) {
320 struct ceph_mds_request *req;
321 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
322 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
323
324 /* discard old result, if any */
325 if (fi->last_readdir) {
326 ceph_mdsc_put_request(fi->last_readdir);
327 fi->last_readdir = NULL;
328 }
329
330 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
331 ceph_vinop(inode), frag, fi->last_name);
332 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
333 if (IS_ERR(req))
334 return PTR_ERR(req);
335 err = ceph_alloc_readdir_reply_buffer(req, inode);
336 if (err) {
337 ceph_mdsc_put_request(req);
338 return err;
339 }
340 /* hints to request -> mds selection code */
341 req->r_direct_mode = USE_AUTH_MDS;
342 req->r_direct_hash = ceph_frag_value(frag);
343 req->r_direct_is_hash = true;
344 if (fi->last_name) {
345 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
346 if (!req->r_path2) {
347 ceph_mdsc_put_request(req);
348 return -ENOMEM;
349 }
350 }
351 req->r_readdir_offset = fi->next_offset;
352 req->r_args.readdir.frag = cpu_to_le32(frag);
353
354 req->r_inode = inode;
355 ihold(inode);
356 req->r_dentry = dget(file->f_path.dentry);
357 err = ceph_mdsc_do_request(mdsc, NULL, req);
358 if (err < 0) {
359 ceph_mdsc_put_request(req);
360 return err;
361 }
362 dout("readdir got and parsed readdir result=%d"
363 " on frag %x, end=%d, complete=%d\n", err, frag,
364 (int)req->r_reply_info.dir_end,
365 (int)req->r_reply_info.dir_complete);
366
367 if (!req->r_did_prepopulate) {
368 dout("readdir !did_prepopulate");
369 /* preclude from marking dir complete */
370 fi->dir_release_count--;
371 }
372
373 /* note next offset and last dentry name */
374 rinfo = &req->r_reply_info;
375 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
376 frag = le32_to_cpu(rinfo->dir_dir->frag);
377 if (ceph_frag_is_leftmost(frag))
378 fi->next_offset = 2;
379 else
380 fi->next_offset = 0;
381 off = fi->next_offset;
382 }
383 fi->frag = frag;
384 fi->offset = fi->next_offset;
385 fi->last_readdir = req;
386
387 if (req->r_reply_info.dir_end) {
388 kfree(fi->last_name);
389 fi->last_name = NULL;
390 if (ceph_frag_is_rightmost(frag))
391 fi->next_offset = 2;
392 else
393 fi->next_offset = 0;
394 } else {
395 err = note_last_dentry(fi,
396 rinfo->dir_dname[rinfo->dir_nr-1],
397 rinfo->dir_dname_len[rinfo->dir_nr-1]);
398 if (err)
399 return err;
400 fi->next_offset += rinfo->dir_nr;
401 }
402 }
403
404 rinfo = &fi->last_readdir->r_reply_info;
405 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
406 rinfo->dir_nr, off, fi->offset);
407
408 ctx->pos = ceph_make_fpos(frag, off);
409 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
410 struct ceph_mds_reply_inode *in =
411 rinfo->dir_in[off - fi->offset].in;
412 struct ceph_vino vino;
413 ino_t ino;
414
415 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
416 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
417 rinfo->dir_dname_len[off - fi->offset],
418 rinfo->dir_dname[off - fi->offset], in);
419 BUG_ON(!in);
420 ftype = le32_to_cpu(in->mode) >> 12;
421 vino.ino = le64_to_cpu(in->ino);
422 vino.snap = le64_to_cpu(in->snapid);
423 ino = ceph_vino_to_ino(vino);
424 if (!dir_emit(ctx,
425 rinfo->dir_dname[off - fi->offset],
426 rinfo->dir_dname_len[off - fi->offset],
427 ceph_translate_ino(inode->i_sb, ino), ftype)) {
428 dout("filldir stopping us...\n");
429 return 0;
430 }
431 off++;
432 ctx->pos++;
433 }
434
435 if (fi->last_name) {
436 ceph_mdsc_put_request(fi->last_readdir);
437 fi->last_readdir = NULL;
438 goto more;
439 }
440
441 /* more frags? */
442 if (!ceph_frag_is_rightmost(frag)) {
443 frag = ceph_frag_next(frag);
444 off = 0;
445 ctx->pos = ceph_make_fpos(frag, off);
446 dout("readdir next frag is %x\n", frag);
447 goto more;
448 }
449 fi->flags |= CEPH_F_ATEND;
450
451 /*
452 * if dir_release_count still matches the dir, no dentries
453 * were released during the whole readdir, and we should have
454 * the complete dir contents in our cache.
455 */
456 spin_lock(&ci->i_ceph_lock);
457 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
458 if (ci->i_ordered_count == fi->dir_ordered_count)
459 dout(" marking %p complete and ordered\n", inode);
460 else
461 dout(" marking %p complete\n", inode);
462 __ceph_dir_set_complete(ci, fi->dir_release_count,
463 fi->dir_ordered_count);
464 }
465 spin_unlock(&ci->i_ceph_lock);
466
467 dout("readdir %p file %p done.\n", inode, file);
468 return 0;
469 }
470
471 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
472 {
473 if (fi->last_readdir) {
474 ceph_mdsc_put_request(fi->last_readdir);
475 fi->last_readdir = NULL;
476 }
477 kfree(fi->last_name);
478 fi->last_name = NULL;
479 if (ceph_frag_is_leftmost(frag))
480 fi->next_offset = 2; /* compensate for . and .. */
481 else
482 fi->next_offset = 0;
483 if (fi->dentry) {
484 dput(fi->dentry);
485 fi->dentry = NULL;
486 }
487 fi->flags &= ~CEPH_F_ATEND;
488 }
489
490 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
491 {
492 struct ceph_file_info *fi = file->private_data;
493 struct inode *inode = file->f_mapping->host;
494 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
495 loff_t retval;
496
497 mutex_lock(&inode->i_mutex);
498 retval = -EINVAL;
499 switch (whence) {
500 case SEEK_END:
501 offset += inode->i_size + 2; /* FIXME */
502 break;
503 case SEEK_CUR:
504 offset += file->f_pos;
505 case SEEK_SET:
506 break;
507 default:
508 goto out;
509 }
510
511 if (offset >= 0) {
512 if (offset != file->f_pos) {
513 file->f_pos = offset;
514 file->f_version = 0;
515 fi->flags &= ~CEPH_F_ATEND;
516 }
517 retval = offset;
518
519 /*
520 * discard buffered readdir content on seekdir(0), or
521 * seek to new frag, or seek prior to current chunk.
522 */
523 if (offset == 0 ||
524 fpos_frag(offset) != fi->frag ||
525 fpos_off(offset) < fi->offset) {
526 dout("dir_llseek dropping %p content\n", file);
527 reset_readdir(fi, fpos_frag(offset));
528 }
529
530 /* bump dir_release_count if we did a forward seek */
531 if (fpos_cmp(offset, old_offset) > 0)
532 fi->dir_release_count--;
533 }
534 out:
535 mutex_unlock(&inode->i_mutex);
536 return retval;
537 }
538
539 /*
540 * Handle lookups for the hidden .snap directory.
541 */
542 int ceph_handle_snapdir(struct ceph_mds_request *req,
543 struct dentry *dentry, int err)
544 {
545 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
546 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
547
548 /* .snap dir? */
549 if (err == -ENOENT &&
550 ceph_snap(parent) == CEPH_NOSNAP &&
551 strcmp(dentry->d_name.name,
552 fsc->mount_options->snapdir_name) == 0) {
553 struct inode *inode = ceph_get_snapdir(parent);
554 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
555 dentry, dentry, inode);
556 BUG_ON(!d_unhashed(dentry));
557 d_add(dentry, inode);
558 err = 0;
559 }
560 return err;
561 }
562
563 /*
564 * Figure out final result of a lookup/open request.
565 *
566 * Mainly, make sure we return the final req->r_dentry (if it already
567 * existed) in place of the original VFS-provided dentry when they
568 * differ.
569 *
570 * Gracefully handle the case where the MDS replies with -ENOENT and
571 * no trace (which it may do, at its discretion, e.g., if it doesn't
572 * care to issue a lease on the negative dentry).
573 */
574 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
575 struct dentry *dentry, int err)
576 {
577 if (err == -ENOENT) {
578 /* no trace? */
579 err = 0;
580 if (!req->r_reply_info.head->is_dentry) {
581 dout("ENOENT and no trace, dentry %p inode %p\n",
582 dentry, d_inode(dentry));
583 if (d_really_is_positive(dentry)) {
584 d_drop(dentry);
585 err = -ENOENT;
586 } else {
587 d_add(dentry, NULL);
588 }
589 }
590 }
591 if (err)
592 dentry = ERR_PTR(err);
593 else if (dentry != req->r_dentry)
594 dentry = dget(req->r_dentry); /* we got spliced */
595 else
596 dentry = NULL;
597 return dentry;
598 }
599
600 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
601 {
602 return ceph_ino(inode) == CEPH_INO_ROOT &&
603 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
604 }
605
606 /*
607 * Look up a single dir entry. If there is a lookup intent, inform
608 * the MDS so that it gets our 'caps wanted' value in a single op.
609 */
610 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
611 unsigned int flags)
612 {
613 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
614 struct ceph_mds_client *mdsc = fsc->mdsc;
615 struct ceph_mds_request *req;
616 int op;
617 int err;
618
619 dout("lookup %p dentry %p '%pd'\n",
620 dir, dentry, dentry);
621
622 if (dentry->d_name.len > NAME_MAX)
623 return ERR_PTR(-ENAMETOOLONG);
624
625 err = ceph_init_dentry(dentry);
626 if (err < 0)
627 return ERR_PTR(err);
628
629 /* can we conclude ENOENT locally? */
630 if (d_really_is_negative(dentry)) {
631 struct ceph_inode_info *ci = ceph_inode(dir);
632 struct ceph_dentry_info *di = ceph_dentry(dentry);
633
634 spin_lock(&ci->i_ceph_lock);
635 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
636 if (strncmp(dentry->d_name.name,
637 fsc->mount_options->snapdir_name,
638 dentry->d_name.len) &&
639 !is_root_ceph_dentry(dir, dentry) &&
640 ceph_test_mount_opt(fsc, DCACHE) &&
641 __ceph_dir_is_complete(ci) &&
642 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
643 spin_unlock(&ci->i_ceph_lock);
644 dout(" dir %p complete, -ENOENT\n", dir);
645 d_add(dentry, NULL);
646 di->lease_shared_gen = ci->i_shared_gen;
647 return NULL;
648 }
649 spin_unlock(&ci->i_ceph_lock);
650 }
651
652 op = ceph_snap(dir) == CEPH_SNAPDIR ?
653 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
654 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
655 if (IS_ERR(req))
656 return ERR_CAST(req);
657 req->r_dentry = dget(dentry);
658 req->r_num_caps = 2;
659 /* we only need inode linkage */
660 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
661 req->r_locked_dir = dir;
662 err = ceph_mdsc_do_request(mdsc, NULL, req);
663 err = ceph_handle_snapdir(req, dentry, err);
664 dentry = ceph_finish_lookup(req, dentry, err);
665 ceph_mdsc_put_request(req); /* will dput(dentry) */
666 dout("lookup result=%p\n", dentry);
667 return dentry;
668 }
669
670 /*
671 * If we do a create but get no trace back from the MDS, follow up with
672 * a lookup (the VFS expects us to link up the provided dentry).
673 */
674 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
675 {
676 struct dentry *result = ceph_lookup(dir, dentry, 0);
677
678 if (result && !IS_ERR(result)) {
679 /*
680 * We created the item, then did a lookup, and found
681 * it was already linked to another inode we already
682 * had in our cache (and thus got spliced). To not
683 * confuse VFS (especially when inode is a directory),
684 * we don't link our dentry to that inode, return an
685 * error instead.
686 *
687 * This event should be rare and it happens only when
688 * we talk to old MDS. Recent MDS does not send traceless
689 * reply for request that creates new inode.
690 */
691 d_drop(result);
692 return -ESTALE;
693 }
694 return PTR_ERR(result);
695 }
696
697 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
698 umode_t mode, dev_t rdev)
699 {
700 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
701 struct ceph_mds_client *mdsc = fsc->mdsc;
702 struct ceph_mds_request *req;
703 struct ceph_acls_info acls = {};
704 int err;
705
706 if (ceph_snap(dir) != CEPH_NOSNAP)
707 return -EROFS;
708
709 err = ceph_pre_init_acls(dir, &mode, &acls);
710 if (err < 0)
711 return err;
712
713 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
714 dir, dentry, mode, rdev);
715 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
716 if (IS_ERR(req)) {
717 err = PTR_ERR(req);
718 goto out;
719 }
720 req->r_dentry = dget(dentry);
721 req->r_num_caps = 2;
722 req->r_locked_dir = dir;
723 req->r_args.mknod.mode = cpu_to_le32(mode);
724 req->r_args.mknod.rdev = cpu_to_le32(rdev);
725 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
726 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
727 if (acls.pagelist) {
728 req->r_pagelist = acls.pagelist;
729 acls.pagelist = NULL;
730 }
731 err = ceph_mdsc_do_request(mdsc, dir, req);
732 if (!err && !req->r_reply_info.head->is_dentry)
733 err = ceph_handle_notrace_create(dir, dentry);
734 ceph_mdsc_put_request(req);
735 out:
736 if (!err)
737 ceph_init_inode_acls(d_inode(dentry), &acls);
738 else
739 d_drop(dentry);
740 ceph_release_acls_info(&acls);
741 return err;
742 }
743
744 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
745 bool excl)
746 {
747 return ceph_mknod(dir, dentry, mode, 0);
748 }
749
750 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
751 const char *dest)
752 {
753 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
754 struct ceph_mds_client *mdsc = fsc->mdsc;
755 struct ceph_mds_request *req;
756 int err;
757
758 if (ceph_snap(dir) != CEPH_NOSNAP)
759 return -EROFS;
760
761 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
762 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
763 if (IS_ERR(req)) {
764 err = PTR_ERR(req);
765 goto out;
766 }
767 req->r_path2 = kstrdup(dest, GFP_NOFS);
768 if (!req->r_path2) {
769 err = -ENOMEM;
770 ceph_mdsc_put_request(req);
771 goto out;
772 }
773 req->r_locked_dir = dir;
774 req->r_dentry = dget(dentry);
775 req->r_num_caps = 2;
776 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
777 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
778 err = ceph_mdsc_do_request(mdsc, dir, req);
779 if (!err && !req->r_reply_info.head->is_dentry)
780 err = ceph_handle_notrace_create(dir, dentry);
781 ceph_mdsc_put_request(req);
782 out:
783 if (err)
784 d_drop(dentry);
785 return err;
786 }
787
788 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
789 {
790 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
791 struct ceph_mds_client *mdsc = fsc->mdsc;
792 struct ceph_mds_request *req;
793 struct ceph_acls_info acls = {};
794 int err = -EROFS;
795 int op;
796
797 if (ceph_snap(dir) == CEPH_SNAPDIR) {
798 /* mkdir .snap/foo is a MKSNAP */
799 op = CEPH_MDS_OP_MKSNAP;
800 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
801 dentry, dentry);
802 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
803 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
804 op = CEPH_MDS_OP_MKDIR;
805 } else {
806 goto out;
807 }
808
809 mode |= S_IFDIR;
810 err = ceph_pre_init_acls(dir, &mode, &acls);
811 if (err < 0)
812 goto out;
813
814 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
815 if (IS_ERR(req)) {
816 err = PTR_ERR(req);
817 goto out;
818 }
819
820 req->r_dentry = dget(dentry);
821 req->r_num_caps = 2;
822 req->r_locked_dir = dir;
823 req->r_args.mkdir.mode = cpu_to_le32(mode);
824 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
825 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
826 if (acls.pagelist) {
827 req->r_pagelist = acls.pagelist;
828 acls.pagelist = NULL;
829 }
830 err = ceph_mdsc_do_request(mdsc, dir, req);
831 if (!err &&
832 !req->r_reply_info.head->is_target &&
833 !req->r_reply_info.head->is_dentry)
834 err = ceph_handle_notrace_create(dir, dentry);
835 ceph_mdsc_put_request(req);
836 out:
837 if (!err)
838 ceph_init_inode_acls(d_inode(dentry), &acls);
839 else
840 d_drop(dentry);
841 ceph_release_acls_info(&acls);
842 return err;
843 }
844
845 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
846 struct dentry *dentry)
847 {
848 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
849 struct ceph_mds_client *mdsc = fsc->mdsc;
850 struct ceph_mds_request *req;
851 int err;
852
853 if (ceph_snap(dir) != CEPH_NOSNAP)
854 return -EROFS;
855
856 dout("link in dir %p old_dentry %p dentry %p\n", dir,
857 old_dentry, dentry);
858 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
859 if (IS_ERR(req)) {
860 d_drop(dentry);
861 return PTR_ERR(req);
862 }
863 req->r_dentry = dget(dentry);
864 req->r_num_caps = 2;
865 req->r_old_dentry = dget(old_dentry);
866 req->r_locked_dir = dir;
867 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
868 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
869 /* release LINK_SHARED on source inode (mds will lock it) */
870 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
871 err = ceph_mdsc_do_request(mdsc, dir, req);
872 if (err) {
873 d_drop(dentry);
874 } else if (!req->r_reply_info.head->is_dentry) {
875 ihold(d_inode(old_dentry));
876 d_instantiate(dentry, d_inode(old_dentry));
877 }
878 ceph_mdsc_put_request(req);
879 return err;
880 }
881
882 /*
883 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
884 * looks like the link count will hit 0, drop any other caps (other
885 * than PIN) we don't specifically want (due to the file still being
886 * open).
887 */
888 static int drop_caps_for_unlink(struct inode *inode)
889 {
890 struct ceph_inode_info *ci = ceph_inode(inode);
891 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
892
893 spin_lock(&ci->i_ceph_lock);
894 if (inode->i_nlink == 1) {
895 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
896 ci->i_ceph_flags |= CEPH_I_NODELAY;
897 }
898 spin_unlock(&ci->i_ceph_lock);
899 return drop;
900 }
901
902 /*
903 * rmdir and unlink are differ only by the metadata op code
904 */
905 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
906 {
907 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
908 struct ceph_mds_client *mdsc = fsc->mdsc;
909 struct inode *inode = d_inode(dentry);
910 struct ceph_mds_request *req;
911 int err = -EROFS;
912 int op;
913
914 if (ceph_snap(dir) == CEPH_SNAPDIR) {
915 /* rmdir .snap/foo is RMSNAP */
916 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
917 op = CEPH_MDS_OP_RMSNAP;
918 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
919 dout("unlink/rmdir dir %p dn %p inode %p\n",
920 dir, dentry, inode);
921 op = d_is_dir(dentry) ?
922 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
923 } else
924 goto out;
925 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
926 if (IS_ERR(req)) {
927 err = PTR_ERR(req);
928 goto out;
929 }
930 req->r_dentry = dget(dentry);
931 req->r_num_caps = 2;
932 req->r_locked_dir = dir;
933 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
934 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
935 req->r_inode_drop = drop_caps_for_unlink(inode);
936 err = ceph_mdsc_do_request(mdsc, dir, req);
937 if (!err && !req->r_reply_info.head->is_dentry)
938 d_delete(dentry);
939 ceph_mdsc_put_request(req);
940 out:
941 return err;
942 }
943
944 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
945 struct inode *new_dir, struct dentry *new_dentry)
946 {
947 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
948 struct ceph_mds_client *mdsc = fsc->mdsc;
949 struct ceph_mds_request *req;
950 int op = CEPH_MDS_OP_RENAME;
951 int err;
952
953 if (ceph_snap(old_dir) != ceph_snap(new_dir))
954 return -EXDEV;
955 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
956 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
957 op = CEPH_MDS_OP_RENAMESNAP;
958 else
959 return -EROFS;
960 }
961 dout("rename dir %p dentry %p to dir %p dentry %p\n",
962 old_dir, old_dentry, new_dir, new_dentry);
963 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
964 if (IS_ERR(req))
965 return PTR_ERR(req);
966 ihold(old_dir);
967 req->r_dentry = dget(new_dentry);
968 req->r_num_caps = 2;
969 req->r_old_dentry = dget(old_dentry);
970 req->r_old_dentry_dir = old_dir;
971 req->r_locked_dir = new_dir;
972 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
973 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
974 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
975 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
976 /* release LINK_RDCACHE on source inode (mds will lock it) */
977 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
978 if (d_really_is_positive(new_dentry))
979 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
980 err = ceph_mdsc_do_request(mdsc, old_dir, req);
981 if (!err && !req->r_reply_info.head->is_dentry) {
982 /*
983 * Normally d_move() is done by fill_trace (called by
984 * do_request, above). If there is no trace, we need
985 * to do it here.
986 */
987
988 d_move(old_dentry, new_dentry);
989
990 /* ensure target dentry is invalidated, despite
991 rehashing bug in vfs_rename_dir */
992 ceph_invalidate_dentry_lease(new_dentry);
993
994 /* d_move screws up sibling dentries' offsets */
995 ceph_dir_clear_complete(old_dir);
996 ceph_dir_clear_complete(new_dir);
997
998 }
999 ceph_mdsc_put_request(req);
1000 return err;
1001 }
1002
1003 /*
1004 * Ensure a dentry lease will no longer revalidate.
1005 */
1006 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1007 {
1008 spin_lock(&dentry->d_lock);
1009 dentry->d_time = jiffies;
1010 ceph_dentry(dentry)->lease_shared_gen = 0;
1011 spin_unlock(&dentry->d_lock);
1012 }
1013
1014 /*
1015 * Check if dentry lease is valid. If not, delete the lease. Try to
1016 * renew if the least is more than half up.
1017 */
1018 static int dentry_lease_is_valid(struct dentry *dentry)
1019 {
1020 struct ceph_dentry_info *di;
1021 struct ceph_mds_session *s;
1022 int valid = 0;
1023 u32 gen;
1024 unsigned long ttl;
1025 struct ceph_mds_session *session = NULL;
1026 struct inode *dir = NULL;
1027 u32 seq = 0;
1028
1029 spin_lock(&dentry->d_lock);
1030 di = ceph_dentry(dentry);
1031 if (di->lease_session) {
1032 s = di->lease_session;
1033 spin_lock(&s->s_gen_ttl_lock);
1034 gen = s->s_cap_gen;
1035 ttl = s->s_cap_ttl;
1036 spin_unlock(&s->s_gen_ttl_lock);
1037
1038 if (di->lease_gen == gen &&
1039 time_before(jiffies, dentry->d_time) &&
1040 time_before(jiffies, ttl)) {
1041 valid = 1;
1042 if (di->lease_renew_after &&
1043 time_after(jiffies, di->lease_renew_after)) {
1044 /* we should renew */
1045 dir = d_inode(dentry->d_parent);
1046 session = ceph_get_mds_session(s);
1047 seq = di->lease_seq;
1048 di->lease_renew_after = 0;
1049 di->lease_renew_from = jiffies;
1050 }
1051 }
1052 }
1053 spin_unlock(&dentry->d_lock);
1054
1055 if (session) {
1056 ceph_mdsc_lease_send_msg(session, dir, dentry,
1057 CEPH_MDS_LEASE_RENEW, seq);
1058 ceph_put_mds_session(session);
1059 }
1060 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1061 return valid;
1062 }
1063
1064 /*
1065 * Check if directory-wide content lease/cap is valid.
1066 */
1067 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1068 {
1069 struct ceph_inode_info *ci = ceph_inode(dir);
1070 struct ceph_dentry_info *di = ceph_dentry(dentry);
1071 int valid = 0;
1072
1073 spin_lock(&ci->i_ceph_lock);
1074 if (ci->i_shared_gen == di->lease_shared_gen)
1075 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1076 spin_unlock(&ci->i_ceph_lock);
1077 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1078 dir, (unsigned)ci->i_shared_gen, dentry,
1079 (unsigned)di->lease_shared_gen, valid);
1080 return valid;
1081 }
1082
1083 /*
1084 * Check if cached dentry can be trusted.
1085 */
1086 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1087 {
1088 int valid = 0;
1089 struct inode *dir;
1090
1091 if (flags & LOOKUP_RCU)
1092 return -ECHILD;
1093
1094 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1095 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1096
1097 dir = ceph_get_dentry_parent_inode(dentry);
1098
1099 /* always trust cached snapped dentries, snapdir dentry */
1100 if (ceph_snap(dir) != CEPH_NOSNAP) {
1101 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1102 dentry, d_inode(dentry));
1103 valid = 1;
1104 } else if (d_really_is_positive(dentry) &&
1105 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1106 valid = 1;
1107 } else if (dentry_lease_is_valid(dentry) ||
1108 dir_lease_is_valid(dir, dentry)) {
1109 if (d_really_is_positive(dentry))
1110 valid = ceph_is_any_caps(d_inode(dentry));
1111 else
1112 valid = 1;
1113 }
1114
1115 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1116 if (valid) {
1117 ceph_dentry_lru_touch(dentry);
1118 } else {
1119 ceph_dir_clear_complete(dir);
1120 }
1121 iput(dir);
1122 return valid;
1123 }
1124
1125 /*
1126 * Release our ceph_dentry_info.
1127 */
1128 static void ceph_d_release(struct dentry *dentry)
1129 {
1130 struct ceph_dentry_info *di = ceph_dentry(dentry);
1131
1132 dout("d_release %p\n", dentry);
1133 ceph_dentry_lru_del(dentry);
1134 if (di->lease_session)
1135 ceph_put_mds_session(di->lease_session);
1136 kmem_cache_free(ceph_dentry_cachep, di);
1137 dentry->d_fsdata = NULL;
1138 }
1139
1140 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1141 unsigned int flags)
1142 {
1143 /*
1144 * Eventually, we'll want to revalidate snapped metadata
1145 * too... probably...
1146 */
1147 return 1;
1148 }
1149
1150 /*
1151 * When the VFS prunes a dentry from the cache, we need to clear the
1152 * complete flag on the parent directory.
1153 *
1154 * Called under dentry->d_lock.
1155 */
1156 static void ceph_d_prune(struct dentry *dentry)
1157 {
1158 dout("ceph_d_prune %p\n", dentry);
1159
1160 /* do we have a valid parent? */
1161 if (IS_ROOT(dentry))
1162 return;
1163
1164 /* if we are not hashed, we don't affect dir's completeness */
1165 if (d_unhashed(dentry))
1166 return;
1167
1168 /*
1169 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1170 * cleared until d_release
1171 */
1172 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1173 }
1174
1175 /*
1176 * read() on a dir. This weird interface hack only works if mounted
1177 * with '-o dirstat'.
1178 */
1179 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1180 loff_t *ppos)
1181 {
1182 struct ceph_file_info *cf = file->private_data;
1183 struct inode *inode = file_inode(file);
1184 struct ceph_inode_info *ci = ceph_inode(inode);
1185 int left;
1186 const int bufsize = 1024;
1187
1188 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1189 return -EISDIR;
1190
1191 if (!cf->dir_info) {
1192 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1193 if (!cf->dir_info)
1194 return -ENOMEM;
1195 cf->dir_info_len =
1196 snprintf(cf->dir_info, bufsize,
1197 "entries: %20lld\n"
1198 " files: %20lld\n"
1199 " subdirs: %20lld\n"
1200 "rentries: %20lld\n"
1201 " rfiles: %20lld\n"
1202 " rsubdirs: %20lld\n"
1203 "rbytes: %20lld\n"
1204 "rctime: %10ld.%09ld\n",
1205 ci->i_files + ci->i_subdirs,
1206 ci->i_files,
1207 ci->i_subdirs,
1208 ci->i_rfiles + ci->i_rsubdirs,
1209 ci->i_rfiles,
1210 ci->i_rsubdirs,
1211 ci->i_rbytes,
1212 (long)ci->i_rctime.tv_sec,
1213 (long)ci->i_rctime.tv_nsec);
1214 }
1215
1216 if (*ppos >= cf->dir_info_len)
1217 return 0;
1218 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1219 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1220 if (left == size)
1221 return -EFAULT;
1222 *ppos += (size - left);
1223 return size - left;
1224 }
1225
1226 /*
1227 * We maintain a private dentry LRU.
1228 *
1229 * FIXME: this needs to be changed to a per-mds lru to be useful.
1230 */
1231 void ceph_dentry_lru_add(struct dentry *dn)
1232 {
1233 struct ceph_dentry_info *di = ceph_dentry(dn);
1234 struct ceph_mds_client *mdsc;
1235
1236 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1237 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1238 spin_lock(&mdsc->dentry_lru_lock);
1239 list_add_tail(&di->lru, &mdsc->dentry_lru);
1240 mdsc->num_dentry++;
1241 spin_unlock(&mdsc->dentry_lru_lock);
1242 }
1243
1244 void ceph_dentry_lru_touch(struct dentry *dn)
1245 {
1246 struct ceph_dentry_info *di = ceph_dentry(dn);
1247 struct ceph_mds_client *mdsc;
1248
1249 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1250 di->offset);
1251 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1252 spin_lock(&mdsc->dentry_lru_lock);
1253 list_move_tail(&di->lru, &mdsc->dentry_lru);
1254 spin_unlock(&mdsc->dentry_lru_lock);
1255 }
1256
1257 void ceph_dentry_lru_del(struct dentry *dn)
1258 {
1259 struct ceph_dentry_info *di = ceph_dentry(dn);
1260 struct ceph_mds_client *mdsc;
1261
1262 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1263 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1264 spin_lock(&mdsc->dentry_lru_lock);
1265 list_del_init(&di->lru);
1266 mdsc->num_dentry--;
1267 spin_unlock(&mdsc->dentry_lru_lock);
1268 }
1269
1270 /*
1271 * Return name hash for a given dentry. This is dependent on
1272 * the parent directory's hash function.
1273 */
1274 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1275 {
1276 struct ceph_inode_info *dci = ceph_inode(dir);
1277
1278 switch (dci->i_dir_layout.dl_dir_hash) {
1279 case 0: /* for backward compat */
1280 case CEPH_STR_HASH_LINUX:
1281 return dn->d_name.hash;
1282
1283 default:
1284 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1285 dn->d_name.name, dn->d_name.len);
1286 }
1287 }
1288
1289 const struct file_operations ceph_dir_fops = {
1290 .read = ceph_read_dir,
1291 .iterate = ceph_readdir,
1292 .llseek = ceph_dir_llseek,
1293 .open = ceph_open,
1294 .release = ceph_release,
1295 .unlocked_ioctl = ceph_ioctl,
1296 .fsync = ceph_fsync,
1297 };
1298
1299 const struct file_operations ceph_snapdir_fops = {
1300 .iterate = ceph_readdir,
1301 .llseek = ceph_dir_llseek,
1302 .open = ceph_open,
1303 .release = ceph_release,
1304 };
1305
1306 const struct inode_operations ceph_dir_iops = {
1307 .lookup = ceph_lookup,
1308 .permission = ceph_permission,
1309 .getattr = ceph_getattr,
1310 .setattr = ceph_setattr,
1311 .setxattr = ceph_setxattr,
1312 .getxattr = ceph_getxattr,
1313 .listxattr = ceph_listxattr,
1314 .removexattr = ceph_removexattr,
1315 .get_acl = ceph_get_acl,
1316 .set_acl = ceph_set_acl,
1317 .mknod = ceph_mknod,
1318 .symlink = ceph_symlink,
1319 .mkdir = ceph_mkdir,
1320 .link = ceph_link,
1321 .unlink = ceph_unlink,
1322 .rmdir = ceph_unlink,
1323 .rename = ceph_rename,
1324 .create = ceph_create,
1325 .atomic_open = ceph_atomic_open,
1326 };
1327
1328 const struct inode_operations ceph_snapdir_iops = {
1329 .lookup = ceph_lookup,
1330 .permission = ceph_permission,
1331 .getattr = ceph_getattr,
1332 .mkdir = ceph_mkdir,
1333 .rmdir = ceph_unlink,
1334 .rename = ceph_rename,
1335 };
1336
1337 const struct dentry_operations ceph_dentry_ops = {
1338 .d_revalidate = ceph_d_revalidate,
1339 .d_release = ceph_d_release,
1340 .d_prune = ceph_d_prune,
1341 };
1342
1343 const struct dentry_operations ceph_snapdir_dentry_ops = {
1344 .d_revalidate = ceph_snapdir_d_revalidate,
1345 .d_release = ceph_d_release,
1346 };
1347
1348 const struct dentry_operations ceph_snap_dentry_ops = {
1349 .d_release = ceph_d_release,
1350 .d_prune = ceph_d_prune,
1351 };
Linux kernel - Deliverables
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