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ceph: explicitly reference rename old_dentry parent dir in request
[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 inode_operations ceph_dir_iops;
30 const struct file_operations ceph_dir_fops;
31 const struct dentry_operations ceph_dentry_ops;
32
33 /*
34 * Initialize ceph dentry state.
35 */
36 int ceph_init_dentry(struct dentry *dentry)
37 {
38 struct ceph_dentry_info *di;
39
40 if (dentry->d_fsdata)
41 return 0;
42
43 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
44 if (!di)
45 return -ENOMEM; /* oh well */
46
47 spin_lock(&dentry->d_lock);
48 if (dentry->d_fsdata) {
49 /* lost a race */
50 kmem_cache_free(ceph_dentry_cachep, di);
51 goto out_unlock;
52 }
53
54 if (dentry->d_parent == NULL || /* nfs fh_to_dentry */
55 ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
56 d_set_d_op(dentry, &ceph_dentry_ops);
57 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
58 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
59 else
60 d_set_d_op(dentry, &ceph_snap_dentry_ops);
61
62 di->dentry = dentry;
63 di->lease_session = NULL;
64 dentry->d_time = jiffies;
65 /* avoid reordering d_fsdata setup so that the check above is safe */
66 smp_mb();
67 dentry->d_fsdata = di;
68 ceph_dentry_lru_add(dentry);
69 out_unlock:
70 spin_unlock(&dentry->d_lock);
71 return 0;
72 }
73
74 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
75 {
76 struct inode *inode = NULL;
77
78 if (!dentry)
79 return NULL;
80
81 spin_lock(&dentry->d_lock);
82 if (dentry->d_parent) {
83 inode = dentry->d_parent->d_inode;
84 ihold(inode);
85 }
86 spin_unlock(&dentry->d_lock);
87 return inode;
88 }
89
90
91 /*
92 * for readdir, we encode the directory frag and offset within that
93 * frag into f_pos.
94 */
95 static unsigned fpos_frag(loff_t p)
96 {
97 return p >> 32;
98 }
99 static unsigned fpos_off(loff_t p)
100 {
101 return p & 0xffffffff;
102 }
103
104 /*
105 * When possible, we try to satisfy a readdir by peeking at the
106 * dcache. We make this work by carefully ordering dentries on
107 * d_u.d_child when we initially get results back from the MDS, and
108 * falling back to a "normal" sync readdir if any dentries in the dir
109 * are dropped.
110 *
111 * I_COMPLETE tells indicates we have all dentries in the dir. It is
112 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
113 * the MDS if/when the directory is modified).
114 */
115 static int __dcache_readdir(struct file *filp,
116 void *dirent, filldir_t filldir)
117 {
118 struct ceph_file_info *fi = filp->private_data;
119 struct dentry *parent = filp->f_dentry;
120 struct inode *dir = parent->d_inode;
121 struct list_head *p;
122 struct dentry *dentry, *last;
123 struct ceph_dentry_info *di;
124 int err = 0;
125
126 /* claim ref on last dentry we returned */
127 last = fi->dentry;
128 fi->dentry = NULL;
129
130 dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
131 last);
132
133 spin_lock(&parent->d_lock);
134
135 /* start at beginning? */
136 if (filp->f_pos == 2 || last == NULL ||
137 filp->f_pos < ceph_dentry(last)->offset) {
138 if (list_empty(&parent->d_subdirs))
139 goto out_unlock;
140 p = parent->d_subdirs.prev;
141 dout(" initial p %p/%p\n", p->prev, p->next);
142 } else {
143 p = last->d_u.d_child.prev;
144 }
145
146 more:
147 dentry = list_entry(p, struct dentry, d_u.d_child);
148 di = ceph_dentry(dentry);
149 while (1) {
150 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
151 d_unhashed(dentry) ? "!hashed" : "hashed",
152 parent->d_subdirs.prev, parent->d_subdirs.next);
153 if (p == &parent->d_subdirs) {
154 fi->flags |= CEPH_F_ATEND;
155 goto out_unlock;
156 }
157 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
158 if (!d_unhashed(dentry) && dentry->d_inode &&
159 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
160 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
161 filp->f_pos <= di->offset)
162 break;
163 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
164 dentry->d_name.len, dentry->d_name.name, di->offset,
165 filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
166 !dentry->d_inode ? " null" : "");
167 spin_unlock(&dentry->d_lock);
168 p = p->prev;
169 dentry = list_entry(p, struct dentry, d_u.d_child);
170 di = ceph_dentry(dentry);
171 }
172
173 dget_dlock(dentry);
174 spin_unlock(&dentry->d_lock);
175 spin_unlock(&parent->d_lock);
176
177 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
178 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
179 filp->f_pos = di->offset;
180 err = filldir(dirent, dentry->d_name.name,
181 dentry->d_name.len, di->offset,
182 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
183 dentry->d_inode->i_mode >> 12);
184
185 if (last) {
186 if (err < 0) {
187 /* remember our position */
188 fi->dentry = last;
189 fi->next_offset = di->offset;
190 } else {
191 dput(last);
192 }
193 }
194 last = dentry;
195
196 if (err < 0)
197 goto out;
198
199 filp->f_pos++;
200
201 /* make sure a dentry wasn't dropped while we didn't have parent lock */
202 if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
203 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
204 err = -EAGAIN;
205 goto out;
206 }
207
208 spin_lock(&parent->d_lock);
209 p = p->prev; /* advance to next dentry */
210 goto more;
211
212 out_unlock:
213 spin_unlock(&parent->d_lock);
214 out:
215 if (last)
216 dput(last);
217 return err;
218 }
219
220 /*
221 * make note of the last dentry we read, so we can
222 * continue at the same lexicographical point,
223 * regardless of what dir changes take place on the
224 * server.
225 */
226 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
227 int len)
228 {
229 kfree(fi->last_name);
230 fi->last_name = kmalloc(len+1, GFP_NOFS);
231 if (!fi->last_name)
232 return -ENOMEM;
233 memcpy(fi->last_name, name, len);
234 fi->last_name[len] = 0;
235 dout("note_last_dentry '%s'\n", fi->last_name);
236 return 0;
237 }
238
239 static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
240 {
241 struct ceph_file_info *fi = filp->private_data;
242 struct inode *inode = filp->f_dentry->d_inode;
243 struct ceph_inode_info *ci = ceph_inode(inode);
244 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
245 struct ceph_mds_client *mdsc = fsc->mdsc;
246 unsigned frag = fpos_frag(filp->f_pos);
247 int off = fpos_off(filp->f_pos);
248 int err;
249 u32 ftype;
250 struct ceph_mds_reply_info_parsed *rinfo;
251 const int max_entries = fsc->mount_options->max_readdir;
252 const int max_bytes = fsc->mount_options->max_readdir_bytes;
253
254 dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
255 if (fi->flags & CEPH_F_ATEND)
256 return 0;
257
258 /* always start with . and .. */
259 if (filp->f_pos == 0) {
260 /* note dir version at start of readdir so we can tell
261 * if any dentries get dropped */
262 fi->dir_release_count = ci->i_release_count;
263
264 dout("readdir off 0 -> '.'\n");
265 if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
266 ceph_translate_ino(inode->i_sb, inode->i_ino),
267 inode->i_mode >> 12) < 0)
268 return 0;
269 filp->f_pos = 1;
270 off = 1;
271 }
272 if (filp->f_pos == 1) {
273 ino_t ino = filp->f_dentry->d_parent->d_inode->i_ino;
274 dout("readdir off 1 -> '..'\n");
275 if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
276 ceph_translate_ino(inode->i_sb, ino),
277 inode->i_mode >> 12) < 0)
278 return 0;
279 filp->f_pos = 2;
280 off = 2;
281 }
282
283 /* can we use the dcache? */
284 spin_lock(&inode->i_lock);
285 if ((filp->f_pos == 2 || fi->dentry) &&
286 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
287 ceph_snap(inode) != CEPH_SNAPDIR &&
288 (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
289 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
290 spin_unlock(&inode->i_lock);
291 err = __dcache_readdir(filp, dirent, filldir);
292 if (err != -EAGAIN)
293 return err;
294 } else {
295 spin_unlock(&inode->i_lock);
296 }
297 if (fi->dentry) {
298 err = note_last_dentry(fi, fi->dentry->d_name.name,
299 fi->dentry->d_name.len);
300 if (err)
301 return err;
302 dput(fi->dentry);
303 fi->dentry = NULL;
304 }
305
306 /* proceed with a normal readdir */
307
308 more:
309 /* do we have the correct frag content buffered? */
310 if (fi->frag != frag || fi->last_readdir == NULL) {
311 struct ceph_mds_request *req;
312 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
313 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
314
315 /* discard old result, if any */
316 if (fi->last_readdir) {
317 ceph_mdsc_put_request(fi->last_readdir);
318 fi->last_readdir = NULL;
319 }
320
321 /* requery frag tree, as the frag topology may have changed */
322 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
323
324 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
325 ceph_vinop(inode), frag, fi->last_name);
326 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
327 if (IS_ERR(req))
328 return PTR_ERR(req);
329 req->r_inode = inode;
330 ihold(inode);
331 req->r_dentry = dget(filp->f_dentry);
332 /* hints to request -> mds selection code */
333 req->r_direct_mode = USE_AUTH_MDS;
334 req->r_direct_hash = ceph_frag_value(frag);
335 req->r_direct_is_hash = true;
336 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
337 req->r_readdir_offset = fi->next_offset;
338 req->r_args.readdir.frag = cpu_to_le32(frag);
339 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
340 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
341 req->r_num_caps = max_entries + 1;
342 err = ceph_mdsc_do_request(mdsc, NULL, req);
343 if (err < 0) {
344 ceph_mdsc_put_request(req);
345 return err;
346 }
347 dout("readdir got and parsed readdir result=%d"
348 " on frag %x, end=%d, complete=%d\n", err, frag,
349 (int)req->r_reply_info.dir_end,
350 (int)req->r_reply_info.dir_complete);
351
352 if (!req->r_did_prepopulate) {
353 dout("readdir !did_prepopulate");
354 fi->dir_release_count--; /* preclude I_COMPLETE */
355 }
356
357 /* note next offset and last dentry name */
358 fi->offset = fi->next_offset;
359 fi->last_readdir = req;
360
361 if (req->r_reply_info.dir_end) {
362 kfree(fi->last_name);
363 fi->last_name = NULL;
364 if (ceph_frag_is_rightmost(frag))
365 fi->next_offset = 2;
366 else
367 fi->next_offset = 0;
368 } else {
369 rinfo = &req->r_reply_info;
370 err = note_last_dentry(fi,
371 rinfo->dir_dname[rinfo->dir_nr-1],
372 rinfo->dir_dname_len[rinfo->dir_nr-1]);
373 if (err)
374 return err;
375 fi->next_offset += rinfo->dir_nr;
376 }
377 }
378
379 rinfo = &fi->last_readdir->r_reply_info;
380 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
381 rinfo->dir_nr, off, fi->offset);
382 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
383 u64 pos = ceph_make_fpos(frag, off);
384 struct ceph_mds_reply_inode *in =
385 rinfo->dir_in[off - fi->offset].in;
386 struct ceph_vino vino;
387 ino_t ino;
388
389 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
390 off, off - fi->offset, rinfo->dir_nr, pos,
391 rinfo->dir_dname_len[off - fi->offset],
392 rinfo->dir_dname[off - fi->offset], in);
393 BUG_ON(!in);
394 ftype = le32_to_cpu(in->mode) >> 12;
395 vino.ino = le64_to_cpu(in->ino);
396 vino.snap = le64_to_cpu(in->snapid);
397 ino = ceph_vino_to_ino(vino);
398 if (filldir(dirent,
399 rinfo->dir_dname[off - fi->offset],
400 rinfo->dir_dname_len[off - fi->offset],
401 pos,
402 ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
403 dout("filldir stopping us...\n");
404 return 0;
405 }
406 off++;
407 filp->f_pos = pos + 1;
408 }
409
410 if (fi->last_name) {
411 ceph_mdsc_put_request(fi->last_readdir);
412 fi->last_readdir = NULL;
413 goto more;
414 }
415
416 /* more frags? */
417 if (!ceph_frag_is_rightmost(frag)) {
418 frag = ceph_frag_next(frag);
419 off = 0;
420 filp->f_pos = ceph_make_fpos(frag, off);
421 dout("readdir next frag is %x\n", frag);
422 goto more;
423 }
424 fi->flags |= CEPH_F_ATEND;
425
426 /*
427 * if dir_release_count still matches the dir, no dentries
428 * were released during the whole readdir, and we should have
429 * the complete dir contents in our cache.
430 */
431 spin_lock(&inode->i_lock);
432 if (ci->i_release_count == fi->dir_release_count) {
433 dout(" marking %p complete\n", inode);
434 /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
435 ci->i_max_offset = filp->f_pos;
436 }
437 spin_unlock(&inode->i_lock);
438
439 dout("readdir %p filp %p done.\n", inode, filp);
440 return 0;
441 }
442
443 static void reset_readdir(struct ceph_file_info *fi)
444 {
445 if (fi->last_readdir) {
446 ceph_mdsc_put_request(fi->last_readdir);
447 fi->last_readdir = NULL;
448 }
449 kfree(fi->last_name);
450 fi->last_name = NULL;
451 fi->next_offset = 2; /* compensate for . and .. */
452 if (fi->dentry) {
453 dput(fi->dentry);
454 fi->dentry = NULL;
455 }
456 fi->flags &= ~CEPH_F_ATEND;
457 }
458
459 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
460 {
461 struct ceph_file_info *fi = file->private_data;
462 struct inode *inode = file->f_mapping->host;
463 loff_t old_offset = offset;
464 loff_t retval;
465
466 mutex_lock(&inode->i_mutex);
467 switch (origin) {
468 case SEEK_END:
469 offset += inode->i_size + 2; /* FIXME */
470 break;
471 case SEEK_CUR:
472 offset += file->f_pos;
473 }
474 retval = -EINVAL;
475 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
476 if (offset != file->f_pos) {
477 file->f_pos = offset;
478 file->f_version = 0;
479 fi->flags &= ~CEPH_F_ATEND;
480 }
481 retval = offset;
482
483 /*
484 * discard buffered readdir content on seekdir(0), or
485 * seek to new frag, or seek prior to current chunk.
486 */
487 if (offset == 0 ||
488 fpos_frag(offset) != fpos_frag(old_offset) ||
489 fpos_off(offset) < fi->offset) {
490 dout("dir_llseek dropping %p content\n", file);
491 reset_readdir(fi);
492 }
493
494 /* bump dir_release_count if we did a forward seek */
495 if (offset > old_offset)
496 fi->dir_release_count--;
497 }
498 mutex_unlock(&inode->i_mutex);
499 return retval;
500 }
501
502 /*
503 * Handle lookups for the hidden .snap directory.
504 */
505 int ceph_handle_snapdir(struct ceph_mds_request *req,
506 struct dentry *dentry, int err)
507 {
508 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
509 struct inode *parent = dentry->d_parent->d_inode;
510
511 /* .snap dir? */
512 if (err == -ENOENT &&
513 ceph_snap(parent) == CEPH_NOSNAP &&
514 strcmp(dentry->d_name.name,
515 fsc->mount_options->snapdir_name) == 0) {
516 struct inode *inode = ceph_get_snapdir(parent);
517 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
518 dentry, dentry->d_name.len, dentry->d_name.name, inode);
519 BUG_ON(!d_unhashed(dentry));
520 d_add(dentry, inode);
521 err = 0;
522 }
523 return err;
524 }
525
526 /*
527 * Figure out final result of a lookup/open request.
528 *
529 * Mainly, make sure we return the final req->r_dentry (if it already
530 * existed) in place of the original VFS-provided dentry when they
531 * differ.
532 *
533 * Gracefully handle the case where the MDS replies with -ENOENT and
534 * no trace (which it may do, at its discretion, e.g., if it doesn't
535 * care to issue a lease on the negative dentry).
536 */
537 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
538 struct dentry *dentry, int err)
539 {
540 if (err == -ENOENT) {
541 /* no trace? */
542 err = 0;
543 if (!req->r_reply_info.head->is_dentry) {
544 dout("ENOENT and no trace, dentry %p inode %p\n",
545 dentry, dentry->d_inode);
546 if (dentry->d_inode) {
547 d_drop(dentry);
548 err = -ENOENT;
549 } else {
550 d_add(dentry, NULL);
551 }
552 }
553 }
554 if (err)
555 dentry = ERR_PTR(err);
556 else if (dentry != req->r_dentry)
557 dentry = dget(req->r_dentry); /* we got spliced */
558 else
559 dentry = NULL;
560 return dentry;
561 }
562
563 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
564 {
565 return ceph_ino(inode) == CEPH_INO_ROOT &&
566 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
567 }
568
569 /*
570 * Look up a single dir entry. If there is a lookup intent, inform
571 * the MDS so that it gets our 'caps wanted' value in a single op.
572 */
573 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
574 struct nameidata *nd)
575 {
576 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
577 struct ceph_mds_client *mdsc = fsc->mdsc;
578 struct ceph_mds_request *req;
579 int op;
580 int err;
581
582 dout("lookup %p dentry %p '%.*s'\n",
583 dir, dentry, dentry->d_name.len, dentry->d_name.name);
584
585 if (dentry->d_name.len > NAME_MAX)
586 return ERR_PTR(-ENAMETOOLONG);
587
588 err = ceph_init_dentry(dentry);
589 if (err < 0)
590 return ERR_PTR(err);
591
592 /* open (but not create!) intent? */
593 if (nd &&
594 (nd->flags & LOOKUP_OPEN) &&
595 (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */
596 !(nd->intent.open.flags & O_CREAT)) {
597 int mode = nd->intent.open.create_mode & ~current->fs->umask;
598 return ceph_lookup_open(dir, dentry, nd, mode, 1);
599 }
600
601 /* can we conclude ENOENT locally? */
602 if (dentry->d_inode == NULL) {
603 struct ceph_inode_info *ci = ceph_inode(dir);
604 struct ceph_dentry_info *di = ceph_dentry(dentry);
605
606 spin_lock(&dir->i_lock);
607 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
608 if (strncmp(dentry->d_name.name,
609 fsc->mount_options->snapdir_name,
610 dentry->d_name.len) &&
611 !is_root_ceph_dentry(dir, dentry) &&
612 (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
613 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
614 spin_unlock(&dir->i_lock);
615 dout(" dir %p complete, -ENOENT\n", dir);
616 d_add(dentry, NULL);
617 di->lease_shared_gen = ci->i_shared_gen;
618 return NULL;
619 }
620 spin_unlock(&dir->i_lock);
621 }
622
623 op = ceph_snap(dir) == CEPH_SNAPDIR ?
624 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
625 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
626 if (IS_ERR(req))
627 return ERR_CAST(req);
628 req->r_dentry = dget(dentry);
629 req->r_num_caps = 2;
630 /* we only need inode linkage */
631 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
632 req->r_locked_dir = dir;
633 err = ceph_mdsc_do_request(mdsc, NULL, req);
634 err = ceph_handle_snapdir(req, dentry, err);
635 dentry = ceph_finish_lookup(req, dentry, err);
636 ceph_mdsc_put_request(req); /* will dput(dentry) */
637 dout("lookup result=%p\n", dentry);
638 return dentry;
639 }
640
641 /*
642 * If we do a create but get no trace back from the MDS, follow up with
643 * a lookup (the VFS expects us to link up the provided dentry).
644 */
645 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
646 {
647 struct dentry *result = ceph_lookup(dir, dentry, NULL);
648
649 if (result && !IS_ERR(result)) {
650 /*
651 * We created the item, then did a lookup, and found
652 * it was already linked to another inode we already
653 * had in our cache (and thus got spliced). Link our
654 * dentry to that inode, but don't hash it, just in
655 * case the VFS wants to dereference it.
656 */
657 BUG_ON(!result->d_inode);
658 d_instantiate(dentry, result->d_inode);
659 return 0;
660 }
661 return PTR_ERR(result);
662 }
663
664 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
665 int mode, dev_t rdev)
666 {
667 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
668 struct ceph_mds_client *mdsc = fsc->mdsc;
669 struct ceph_mds_request *req;
670 int err;
671
672 if (ceph_snap(dir) != CEPH_NOSNAP)
673 return -EROFS;
674
675 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
676 dir, dentry, mode, rdev);
677 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
678 if (IS_ERR(req)) {
679 d_drop(dentry);
680 return PTR_ERR(req);
681 }
682 req->r_dentry = dget(dentry);
683 req->r_num_caps = 2;
684 req->r_locked_dir = dir;
685 req->r_args.mknod.mode = cpu_to_le32(mode);
686 req->r_args.mknod.rdev = cpu_to_le32(rdev);
687 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
688 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
689 err = ceph_mdsc_do_request(mdsc, dir, req);
690 if (!err && !req->r_reply_info.head->is_dentry)
691 err = ceph_handle_notrace_create(dir, dentry);
692 ceph_mdsc_put_request(req);
693 if (err)
694 d_drop(dentry);
695 return err;
696 }
697
698 static int ceph_create(struct inode *dir, struct dentry *dentry, int mode,
699 struct nameidata *nd)
700 {
701 dout("create in dir %p dentry %p name '%.*s'\n",
702 dir, dentry, dentry->d_name.len, dentry->d_name.name);
703
704 if (ceph_snap(dir) != CEPH_NOSNAP)
705 return -EROFS;
706
707 if (nd) {
708 BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
709 dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
710 /* hrm, what should i do here if we get aliased? */
711 if (IS_ERR(dentry))
712 return PTR_ERR(dentry);
713 return 0;
714 }
715
716 /* fall back to mknod */
717 return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
718 }
719
720 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
721 const char *dest)
722 {
723 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
724 struct ceph_mds_client *mdsc = fsc->mdsc;
725 struct ceph_mds_request *req;
726 int err;
727
728 if (ceph_snap(dir) != CEPH_NOSNAP)
729 return -EROFS;
730
731 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
732 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
733 if (IS_ERR(req)) {
734 d_drop(dentry);
735 return PTR_ERR(req);
736 }
737 req->r_dentry = dget(dentry);
738 req->r_num_caps = 2;
739 req->r_path2 = kstrdup(dest, GFP_NOFS);
740 req->r_locked_dir = dir;
741 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
742 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
743 err = ceph_mdsc_do_request(mdsc, dir, req);
744 if (!err && !req->r_reply_info.head->is_dentry)
745 err = ceph_handle_notrace_create(dir, dentry);
746 ceph_mdsc_put_request(req);
747 if (err)
748 d_drop(dentry);
749 return err;
750 }
751
752 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode)
753 {
754 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
755 struct ceph_mds_client *mdsc = fsc->mdsc;
756 struct ceph_mds_request *req;
757 int err = -EROFS;
758 int op;
759
760 if (ceph_snap(dir) == CEPH_SNAPDIR) {
761 /* mkdir .snap/foo is a MKSNAP */
762 op = CEPH_MDS_OP_MKSNAP;
763 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
764 dentry->d_name.len, dentry->d_name.name, dentry);
765 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
766 dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode);
767 op = CEPH_MDS_OP_MKDIR;
768 } else {
769 goto out;
770 }
771 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
772 if (IS_ERR(req)) {
773 err = PTR_ERR(req);
774 goto out;
775 }
776
777 req->r_dentry = dget(dentry);
778 req->r_num_caps = 2;
779 req->r_locked_dir = dir;
780 req->r_args.mkdir.mode = cpu_to_le32(mode);
781 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
782 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
783 err = ceph_mdsc_do_request(mdsc, dir, req);
784 if (!err && !req->r_reply_info.head->is_dentry)
785 err = ceph_handle_notrace_create(dir, dentry);
786 ceph_mdsc_put_request(req);
787 out:
788 if (err < 0)
789 d_drop(dentry);
790 return err;
791 }
792
793 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
794 struct dentry *dentry)
795 {
796 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
797 struct ceph_mds_client *mdsc = fsc->mdsc;
798 struct ceph_mds_request *req;
799 int err;
800
801 if (ceph_snap(dir) != CEPH_NOSNAP)
802 return -EROFS;
803
804 dout("link in dir %p old_dentry %p dentry %p\n", dir,
805 old_dentry, dentry);
806 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
807 if (IS_ERR(req)) {
808 d_drop(dentry);
809 return PTR_ERR(req);
810 }
811 req->r_dentry = dget(dentry);
812 req->r_num_caps = 2;
813 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
814 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
815 req->r_locked_dir = dir;
816 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
817 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
818 err = ceph_mdsc_do_request(mdsc, dir, req);
819 if (err) {
820 d_drop(dentry);
821 } else if (!req->r_reply_info.head->is_dentry) {
822 ihold(old_dentry->d_inode);
823 d_instantiate(dentry, old_dentry->d_inode);
824 }
825 ceph_mdsc_put_request(req);
826 return err;
827 }
828
829 /*
830 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
831 * looks like the link count will hit 0, drop any other caps (other
832 * than PIN) we don't specifically want (due to the file still being
833 * open).
834 */
835 static int drop_caps_for_unlink(struct inode *inode)
836 {
837 struct ceph_inode_info *ci = ceph_inode(inode);
838 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
839
840 spin_lock(&inode->i_lock);
841 if (inode->i_nlink == 1) {
842 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
843 ci->i_ceph_flags |= CEPH_I_NODELAY;
844 }
845 spin_unlock(&inode->i_lock);
846 return drop;
847 }
848
849 /*
850 * rmdir and unlink are differ only by the metadata op code
851 */
852 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
853 {
854 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
855 struct ceph_mds_client *mdsc = fsc->mdsc;
856 struct inode *inode = dentry->d_inode;
857 struct ceph_mds_request *req;
858 int err = -EROFS;
859 int op;
860
861 if (ceph_snap(dir) == CEPH_SNAPDIR) {
862 /* rmdir .snap/foo is RMSNAP */
863 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
864 dentry->d_name.name, dentry);
865 op = CEPH_MDS_OP_RMSNAP;
866 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
867 dout("unlink/rmdir dir %p dn %p inode %p\n",
868 dir, dentry, inode);
869 op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ?
870 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
871 } else
872 goto out;
873 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
874 if (IS_ERR(req)) {
875 err = PTR_ERR(req);
876 goto out;
877 }
878 req->r_dentry = dget(dentry);
879 req->r_num_caps = 2;
880 req->r_locked_dir = dir;
881 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
882 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
883 req->r_inode_drop = drop_caps_for_unlink(inode);
884 err = ceph_mdsc_do_request(mdsc, dir, req);
885 if (!err && !req->r_reply_info.head->is_dentry)
886 d_delete(dentry);
887 ceph_mdsc_put_request(req);
888 out:
889 return err;
890 }
891
892 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
893 struct inode *new_dir, struct dentry *new_dentry)
894 {
895 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
896 struct ceph_mds_client *mdsc = fsc->mdsc;
897 struct ceph_mds_request *req;
898 int err;
899
900 if (ceph_snap(old_dir) != ceph_snap(new_dir))
901 return -EXDEV;
902 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
903 ceph_snap(new_dir) != CEPH_NOSNAP)
904 return -EROFS;
905 dout("rename dir %p dentry %p to dir %p dentry %p\n",
906 old_dir, old_dentry, new_dir, new_dentry);
907 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
908 if (IS_ERR(req))
909 return PTR_ERR(req);
910 req->r_dentry = dget(new_dentry);
911 req->r_num_caps = 2;
912 req->r_old_dentry = dget(old_dentry);
913 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
914 req->r_locked_dir = new_dir;
915 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
916 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
917 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
918 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
919 /* release LINK_RDCACHE on source inode (mds will lock it) */
920 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
921 if (new_dentry->d_inode)
922 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
923 err = ceph_mdsc_do_request(mdsc, old_dir, req);
924 if (!err && !req->r_reply_info.head->is_dentry) {
925 /*
926 * Normally d_move() is done by fill_trace (called by
927 * do_request, above). If there is no trace, we need
928 * to do it here.
929 */
930
931 /* d_move screws up d_subdirs order */
932 ceph_i_clear(new_dir, CEPH_I_COMPLETE);
933
934 d_move(old_dentry, new_dentry);
935
936 /* ensure target dentry is invalidated, despite
937 rehashing bug in vfs_rename_dir */
938 ceph_invalidate_dentry_lease(new_dentry);
939 }
940 ceph_mdsc_put_request(req);
941 return err;
942 }
943
944 /*
945 * Ensure a dentry lease will no longer revalidate.
946 */
947 void ceph_invalidate_dentry_lease(struct dentry *dentry)
948 {
949 spin_lock(&dentry->d_lock);
950 dentry->d_time = jiffies;
951 ceph_dentry(dentry)->lease_shared_gen = 0;
952 spin_unlock(&dentry->d_lock);
953 }
954
955 /*
956 * Check if dentry lease is valid. If not, delete the lease. Try to
957 * renew if the least is more than half up.
958 */
959 static int dentry_lease_is_valid(struct dentry *dentry)
960 {
961 struct ceph_dentry_info *di;
962 struct ceph_mds_session *s;
963 int valid = 0;
964 u32 gen;
965 unsigned long ttl;
966 struct ceph_mds_session *session = NULL;
967 struct inode *dir = NULL;
968 u32 seq = 0;
969
970 spin_lock(&dentry->d_lock);
971 di = ceph_dentry(dentry);
972 if (di && di->lease_session) {
973 s = di->lease_session;
974 spin_lock(&s->s_cap_lock);
975 gen = s->s_cap_gen;
976 ttl = s->s_cap_ttl;
977 spin_unlock(&s->s_cap_lock);
978
979 if (di->lease_gen == gen &&
980 time_before(jiffies, dentry->d_time) &&
981 time_before(jiffies, ttl)) {
982 valid = 1;
983 if (di->lease_renew_after &&
984 time_after(jiffies, di->lease_renew_after)) {
985 /* we should renew */
986 dir = dentry->d_parent->d_inode;
987 session = ceph_get_mds_session(s);
988 seq = di->lease_seq;
989 di->lease_renew_after = 0;
990 di->lease_renew_from = jiffies;
991 }
992 }
993 }
994 spin_unlock(&dentry->d_lock);
995
996 if (session) {
997 ceph_mdsc_lease_send_msg(session, dir, dentry,
998 CEPH_MDS_LEASE_RENEW, seq);
999 ceph_put_mds_session(session);
1000 }
1001 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1002 return valid;
1003 }
1004
1005 /*
1006 * Check if directory-wide content lease/cap is valid.
1007 */
1008 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1009 {
1010 struct ceph_inode_info *ci = ceph_inode(dir);
1011 struct ceph_dentry_info *di = ceph_dentry(dentry);
1012 int valid = 0;
1013
1014 spin_lock(&dir->i_lock);
1015 if (ci->i_shared_gen == di->lease_shared_gen)
1016 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1017 spin_unlock(&dir->i_lock);
1018 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1019 dir, (unsigned)ci->i_shared_gen, dentry,
1020 (unsigned)di->lease_shared_gen, valid);
1021 return valid;
1022 }
1023
1024 /*
1025 * Check if cached dentry can be trusted.
1026 */
1027 static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
1028 {
1029 int valid = 0;
1030 struct inode *dir;
1031
1032 if (nd && nd->flags & LOOKUP_RCU)
1033 return -ECHILD;
1034
1035 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1036 dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1037 ceph_dentry(dentry)->offset);
1038
1039 dir = ceph_get_dentry_parent_inode(dentry);
1040
1041 /* always trust cached snapped dentries, snapdir dentry */
1042 if (ceph_snap(dir) != CEPH_NOSNAP) {
1043 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1044 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1045 valid = 1;
1046 } else if (dentry->d_inode &&
1047 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1048 valid = 1;
1049 } else if (dentry_lease_is_valid(dentry) ||
1050 dir_lease_is_valid(dir, dentry)) {
1051 valid = 1;
1052 }
1053
1054 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1055 if (valid)
1056 ceph_dentry_lru_touch(dentry);
1057 else
1058 d_drop(dentry);
1059 iput(dir);
1060 return valid;
1061 }
1062
1063 /*
1064 * Release our ceph_dentry_info.
1065 */
1066 static void ceph_d_release(struct dentry *dentry)
1067 {
1068 struct ceph_dentry_info *di = ceph_dentry(dentry);
1069
1070 dout("d_release %p\n", dentry);
1071 if (di) {
1072 ceph_dentry_lru_del(dentry);
1073 if (di->lease_session)
1074 ceph_put_mds_session(di->lease_session);
1075 kmem_cache_free(ceph_dentry_cachep, di);
1076 dentry->d_fsdata = NULL;
1077 }
1078 }
1079
1080 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1081 struct nameidata *nd)
1082 {
1083 /*
1084 * Eventually, we'll want to revalidate snapped metadata
1085 * too... probably...
1086 */
1087 return 1;
1088 }
1089
1090
1091
1092 /*
1093 * read() on a dir. This weird interface hack only works if mounted
1094 * with '-o dirstat'.
1095 */
1096 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1097 loff_t *ppos)
1098 {
1099 struct ceph_file_info *cf = file->private_data;
1100 struct inode *inode = file->f_dentry->d_inode;
1101 struct ceph_inode_info *ci = ceph_inode(inode);
1102 int left;
1103 const int bufsize = 1024;
1104
1105 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1106 return -EISDIR;
1107
1108 if (!cf->dir_info) {
1109 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1110 if (!cf->dir_info)
1111 return -ENOMEM;
1112 cf->dir_info_len =
1113 snprintf(cf->dir_info, bufsize,
1114 "entries: %20lld\n"
1115 " files: %20lld\n"
1116 " subdirs: %20lld\n"
1117 "rentries: %20lld\n"
1118 " rfiles: %20lld\n"
1119 " rsubdirs: %20lld\n"
1120 "rbytes: %20lld\n"
1121 "rctime: %10ld.%09ld\n",
1122 ci->i_files + ci->i_subdirs,
1123 ci->i_files,
1124 ci->i_subdirs,
1125 ci->i_rfiles + ci->i_rsubdirs,
1126 ci->i_rfiles,
1127 ci->i_rsubdirs,
1128 ci->i_rbytes,
1129 (long)ci->i_rctime.tv_sec,
1130 (long)ci->i_rctime.tv_nsec);
1131 }
1132
1133 if (*ppos >= cf->dir_info_len)
1134 return 0;
1135 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1136 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1137 if (left == size)
1138 return -EFAULT;
1139 *ppos += (size - left);
1140 return size - left;
1141 }
1142
1143 /*
1144 * an fsync() on a dir will wait for any uncommitted directory
1145 * operations to commit.
1146 */
1147 static int ceph_dir_fsync(struct file *file, int datasync)
1148 {
1149 struct inode *inode = file->f_path.dentry->d_inode;
1150 struct ceph_inode_info *ci = ceph_inode(inode);
1151 struct list_head *head = &ci->i_unsafe_dirops;
1152 struct ceph_mds_request *req;
1153 u64 last_tid;
1154 int ret = 0;
1155
1156 dout("dir_fsync %p\n", inode);
1157 spin_lock(&ci->i_unsafe_lock);
1158 if (list_empty(head))
1159 goto out;
1160
1161 req = list_entry(head->prev,
1162 struct ceph_mds_request, r_unsafe_dir_item);
1163 last_tid = req->r_tid;
1164
1165 do {
1166 ceph_mdsc_get_request(req);
1167 spin_unlock(&ci->i_unsafe_lock);
1168 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1169 inode, req->r_tid, last_tid);
1170 if (req->r_timeout) {
1171 ret = wait_for_completion_timeout(
1172 &req->r_safe_completion, req->r_timeout);
1173 if (ret > 0)
1174 ret = 0;
1175 else if (ret == 0)
1176 ret = -EIO; /* timed out */
1177 } else {
1178 wait_for_completion(&req->r_safe_completion);
1179 }
1180 spin_lock(&ci->i_unsafe_lock);
1181 ceph_mdsc_put_request(req);
1182
1183 if (ret || list_empty(head))
1184 break;
1185 req = list_entry(head->next,
1186 struct ceph_mds_request, r_unsafe_dir_item);
1187 } while (req->r_tid < last_tid);
1188 out:
1189 spin_unlock(&ci->i_unsafe_lock);
1190 return ret;
1191 }
1192
1193 /*
1194 * We maintain a private dentry LRU.
1195 *
1196 * FIXME: this needs to be changed to a per-mds lru to be useful.
1197 */
1198 void ceph_dentry_lru_add(struct dentry *dn)
1199 {
1200 struct ceph_dentry_info *di = ceph_dentry(dn);
1201 struct ceph_mds_client *mdsc;
1202
1203 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1204 dn->d_name.len, dn->d_name.name);
1205 if (di) {
1206 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1207 spin_lock(&mdsc->dentry_lru_lock);
1208 list_add_tail(&di->lru, &mdsc->dentry_lru);
1209 mdsc->num_dentry++;
1210 spin_unlock(&mdsc->dentry_lru_lock);
1211 }
1212 }
1213
1214 void ceph_dentry_lru_touch(struct dentry *dn)
1215 {
1216 struct ceph_dentry_info *di = ceph_dentry(dn);
1217 struct ceph_mds_client *mdsc;
1218
1219 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1220 dn->d_name.len, dn->d_name.name, di->offset);
1221 if (di) {
1222 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1223 spin_lock(&mdsc->dentry_lru_lock);
1224 list_move_tail(&di->lru, &mdsc->dentry_lru);
1225 spin_unlock(&mdsc->dentry_lru_lock);
1226 }
1227 }
1228
1229 void ceph_dentry_lru_del(struct dentry *dn)
1230 {
1231 struct ceph_dentry_info *di = ceph_dentry(dn);
1232 struct ceph_mds_client *mdsc;
1233
1234 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1235 dn->d_name.len, dn->d_name.name);
1236 if (di) {
1237 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1238 spin_lock(&mdsc->dentry_lru_lock);
1239 list_del_init(&di->lru);
1240 mdsc->num_dentry--;
1241 spin_unlock(&mdsc->dentry_lru_lock);
1242 }
1243 }
1244
1245 /*
1246 * Return name hash for a given dentry. This is dependent on
1247 * the parent directory's hash function.
1248 */
1249 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1250 {
1251 struct ceph_inode_info *dci = ceph_inode(dir);
1252
1253 switch (dci->i_dir_layout.dl_dir_hash) {
1254 case 0: /* for backward compat */
1255 case CEPH_STR_HASH_LINUX:
1256 return dn->d_name.hash;
1257
1258 default:
1259 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1260 dn->d_name.name, dn->d_name.len);
1261 }
1262 }
1263
1264 const struct file_operations ceph_dir_fops = {
1265 .read = ceph_read_dir,
1266 .readdir = ceph_readdir,
1267 .llseek = ceph_dir_llseek,
1268 .open = ceph_open,
1269 .release = ceph_release,
1270 .unlocked_ioctl = ceph_ioctl,
1271 .fsync = ceph_dir_fsync,
1272 };
1273
1274 const struct inode_operations ceph_dir_iops = {
1275 .lookup = ceph_lookup,
1276 .permission = ceph_permission,
1277 .getattr = ceph_getattr,
1278 .setattr = ceph_setattr,
1279 .setxattr = ceph_setxattr,
1280 .getxattr = ceph_getxattr,
1281 .listxattr = ceph_listxattr,
1282 .removexattr = ceph_removexattr,
1283 .mknod = ceph_mknod,
1284 .symlink = ceph_symlink,
1285 .mkdir = ceph_mkdir,
1286 .link = ceph_link,
1287 .unlink = ceph_unlink,
1288 .rmdir = ceph_unlink,
1289 .rename = ceph_rename,
1290 .create = ceph_create,
1291 };
1292
1293 const struct dentry_operations ceph_dentry_ops = {
1294 .d_revalidate = ceph_d_revalidate,
1295 .d_release = ceph_d_release,
1296 };
1297
1298 const struct dentry_operations ceph_snapdir_dentry_ops = {
1299 .d_revalidate = ceph_snapdir_d_revalidate,
1300 .d_release = ceph_d_release,
1301 };
1302
1303 const struct dentry_operations ceph_snap_dentry_ops = {
1304 .d_release = ceph_d_release,
1305 };
Linux kernel - Deliverables
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