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drm/i915/ibx: Ensure the HW is powered during PLL HW readout
[linux/fpc-iii.git] / fs / ceph / dir.c
blobfd11fb231a2ea796e86eae933265a488ad6774e5
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_KERNEL | __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 * make note of the last dentry we read, so we can
111 * continue at the same lexicographical point,
112 * regardless of what dir changes take place on the
113 * server.
114 */
115 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
116 int len, unsigned next_offset)
117 {
118 char *buf = kmalloc(len+1, GFP_KERNEL);
119 if (!buf)
120 return -ENOMEM;
121 kfree(fi->last_name);
122 fi->last_name = buf;
123 memcpy(fi->last_name, name, len);
124 fi->last_name[len] = 0;
125 fi->next_offset = next_offset;
126 dout("note_last_dentry '%s'\n", fi->last_name);
127 return 0;
128 }
129
130 /*
131 * When possible, we try to satisfy a readdir by peeking at the
132 * dcache. We make this work by carefully ordering dentries on
133 * d_child when we initially get results back from the MDS, and
134 * falling back to a "normal" sync readdir if any dentries in the dir
135 * are dropped.
136 *
137 * Complete dir indicates that we have all dentries in the dir. It is
138 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
139 * the MDS if/when the directory is modified).
140 */
141 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
142 u32 shared_gen)
143 {
144 struct ceph_file_info *fi = file->private_data;
145 struct dentry *parent = file->f_path.dentry;
146 struct inode *dir = d_inode(parent);
147 struct dentry *dentry, *last = NULL;
148 struct ceph_dentry_info *di;
149 unsigned nsize = PAGE_CACHE_SIZE / sizeof(struct dentry *);
150 int err = 0;
151 loff_t ptr_pos = 0;
152 struct ceph_readdir_cache_control cache_ctl = {};
153
154 dout("__dcache_readdir %p v%u at %llu\n", dir, shared_gen, ctx->pos);
155
156 /* we can calculate cache index for the first dirfrag */
157 if (ceph_frag_is_leftmost(fpos_frag(ctx->pos))) {
158 cache_ctl.index = fpos_off(ctx->pos) - 2;
159 BUG_ON(cache_ctl.index < 0);
160 ptr_pos = cache_ctl.index * sizeof(struct dentry *);
161 }
162
163 while (true) {
164 pgoff_t pgoff;
165 bool emit_dentry;
166
167 if (ptr_pos >= i_size_read(dir)) {
168 fi->flags |= CEPH_F_ATEND;
169 err = 0;
170 break;
171 }
172
173 err = -EAGAIN;
174 pgoff = ptr_pos >> PAGE_CACHE_SHIFT;
175 if (!cache_ctl.page || pgoff != page_index(cache_ctl.page)) {
176 ceph_readdir_cache_release(&cache_ctl);
177 cache_ctl.page = find_lock_page(&dir->i_data, pgoff);
178 if (!cache_ctl.page) {
179 dout(" page %lu not found\n", pgoff);
180 break;
181 }
182 /* reading/filling the cache are serialized by
183 * i_mutex, no need to use page lock */
184 unlock_page(cache_ctl.page);
185 cache_ctl.dentries = kmap(cache_ctl.page);
186 }
187
188 rcu_read_lock();
189 spin_lock(&parent->d_lock);
190 /* check i_size again here, because empty directory can be
191 * marked as complete while not holding the i_mutex. */
192 if (ceph_dir_is_complete_ordered(dir) &&
193 ptr_pos < i_size_read(dir))
194 dentry = cache_ctl.dentries[cache_ctl.index % nsize];
195 else
196 dentry = NULL;
197 spin_unlock(&parent->d_lock);
198 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
199 dentry = NULL;
200 rcu_read_unlock();
201 if (!dentry)
202 break;
203
204 emit_dentry = false;
205 di = ceph_dentry(dentry);
206 spin_lock(&dentry->d_lock);
207 if (di->lease_shared_gen == shared_gen &&
208 d_really_is_positive(dentry) &&
209 ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR &&
210 ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH &&
211 fpos_cmp(ctx->pos, di->offset) <= 0) {
212 emit_dentry = true;
213 }
214 spin_unlock(&dentry->d_lock);
215
216 if (emit_dentry) {
217 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
218 dentry, dentry, d_inode(dentry));
219 ctx->pos = di->offset;
220 if (!dir_emit(ctx, dentry->d_name.name,
221 dentry->d_name.len,
222 ceph_translate_ino(dentry->d_sb,
223 d_inode(dentry)->i_ino),
224 d_inode(dentry)->i_mode >> 12)) {
225 dput(dentry);
226 err = 0;
227 break;
228 }
229 ctx->pos++;
230
231 if (last)
232 dput(last);
233 last = dentry;
234 } else {
235 dput(dentry);
236 }
237
238 cache_ctl.index++;
239 ptr_pos += sizeof(struct dentry *);
240 }
241 ceph_readdir_cache_release(&cache_ctl);
242 if (last) {
243 int ret;
244 di = ceph_dentry(last);
245 ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
246 fpos_off(di->offset) + 1);
247 if (ret < 0)
248 err = ret;
249 dput(last);
250 }
251 return err;
252 }
253
254 static int ceph_readdir(struct file *file, struct dir_context *ctx)
255 {
256 struct ceph_file_info *fi = file->private_data;
257 struct inode *inode = file_inode(file);
258 struct ceph_inode_info *ci = ceph_inode(inode);
259 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
260 struct ceph_mds_client *mdsc = fsc->mdsc;
261 unsigned frag = fpos_frag(ctx->pos);
262 int off = fpos_off(ctx->pos);
263 int err;
264 u32 ftype;
265 struct ceph_mds_reply_info_parsed *rinfo;
266
267 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
268 if (fi->flags & CEPH_F_ATEND)
269 return 0;
270
271 /* always start with . and .. */
272 if (ctx->pos == 0) {
273 dout("readdir off 0 -> '.'\n");
274 if (!dir_emit(ctx, ".", 1,
275 ceph_translate_ino(inode->i_sb, inode->i_ino),
276 inode->i_mode >> 12))
277 return 0;
278 ctx->pos = 1;
279 off = 1;
280 }
281 if (ctx->pos == 1) {
282 ino_t ino = parent_ino(file->f_path.dentry);
283 dout("readdir off 1 -> '..'\n");
284 if (!dir_emit(ctx, "..", 2,
285 ceph_translate_ino(inode->i_sb, ino),
286 inode->i_mode >> 12))
287 return 0;
288 ctx->pos = 2;
289 off = 2;
290 }
291
292 /* can we use the dcache? */
293 spin_lock(&ci->i_ceph_lock);
294 if (ceph_test_mount_opt(fsc, DCACHE) &&
295 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
296 ceph_snap(inode) != CEPH_SNAPDIR &&
297 __ceph_dir_is_complete_ordered(ci) &&
298 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
299 u32 shared_gen = ci->i_shared_gen;
300 spin_unlock(&ci->i_ceph_lock);
301 err = __dcache_readdir(file, ctx, shared_gen);
302 if (err != -EAGAIN)
303 return err;
304 frag = fpos_frag(ctx->pos);
305 off = fpos_off(ctx->pos);
306 } else {
307 spin_unlock(&ci->i_ceph_lock);
308 }
309
310 /* proceed with a normal readdir */
311 more:
312 /* do we have the correct frag content buffered? */
313 if (fi->frag != frag || fi->last_readdir == NULL) {
314 struct ceph_mds_request *req;
315 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
316 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
317
318 /* discard old result, if any */
319 if (fi->last_readdir) {
320 ceph_mdsc_put_request(fi->last_readdir);
321 fi->last_readdir = NULL;
322 }
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 err = ceph_alloc_readdir_reply_buffer(req, inode);
330 if (err) {
331 ceph_mdsc_put_request(req);
332 return err;
333 }
334 /* hints to request -> mds selection code */
335 req->r_direct_mode = USE_AUTH_MDS;
336 req->r_direct_hash = ceph_frag_value(frag);
337 req->r_direct_is_hash = true;
338 if (fi->last_name) {
339 req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
340 if (!req->r_path2) {
341 ceph_mdsc_put_request(req);
342 return -ENOMEM;
343 }
344 }
345 req->r_dir_release_cnt = fi->dir_release_count;
346 req->r_dir_ordered_cnt = fi->dir_ordered_count;
347 req->r_readdir_cache_idx = fi->readdir_cache_idx;
348 req->r_readdir_offset = fi->next_offset;
349 req->r_args.readdir.frag = cpu_to_le32(frag);
350
351 req->r_inode = inode;
352 ihold(inode);
353 req->r_dentry = dget(file->f_path.dentry);
354 err = ceph_mdsc_do_request(mdsc, NULL, req);
355 if (err < 0) {
356 ceph_mdsc_put_request(req);
357 return err;
358 }
359 dout("readdir got and parsed readdir result=%d"
360 " on frag %x, end=%d, complete=%d\n", err, frag,
361 (int)req->r_reply_info.dir_end,
362 (int)req->r_reply_info.dir_complete);
363
364
365 /* note next offset and last dentry name */
366 rinfo = &req->r_reply_info;
367 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
368 frag = le32_to_cpu(rinfo->dir_dir->frag);
369 off = req->r_readdir_offset;
370 fi->next_offset = off;
371 }
372
373 fi->frag = frag;
374 fi->offset = fi->next_offset;
375 fi->last_readdir = req;
376
377 if (req->r_did_prepopulate) {
378 fi->readdir_cache_idx = req->r_readdir_cache_idx;
379 if (fi->readdir_cache_idx < 0) {
380 /* preclude from marking dir ordered */
381 fi->dir_ordered_count = 0;
382 } else if (ceph_frag_is_leftmost(frag) && off == 2) {
383 /* note dir version at start of readdir so
384 * we can tell if any dentries get dropped */
385 fi->dir_release_count = req->r_dir_release_cnt;
386 fi->dir_ordered_count = req->r_dir_ordered_cnt;
387 }
388 } else {
389 dout("readdir !did_prepopulate");
390 /* disable readdir cache */
391 fi->readdir_cache_idx = -1;
392 /* preclude from marking dir complete */
393 fi->dir_release_count = 0;
394 }
395
396 if (req->r_reply_info.dir_end) {
397 kfree(fi->last_name);
398 fi->last_name = NULL;
399 if (ceph_frag_is_rightmost(frag))
400 fi->next_offset = 2;
401 else
402 fi->next_offset = 0;
403 } else {
404 err = note_last_dentry(fi,
405 rinfo->dir_dname[rinfo->dir_nr-1],
406 rinfo->dir_dname_len[rinfo->dir_nr-1],
407 fi->next_offset + rinfo->dir_nr);
408 if (err)
409 return err;
410 }
411 }
412
413 rinfo = &fi->last_readdir->r_reply_info;
414 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
415 rinfo->dir_nr, off, fi->offset);
416
417 ctx->pos = ceph_make_fpos(frag, off);
418 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
419 struct ceph_mds_reply_inode *in =
420 rinfo->dir_in[off - fi->offset].in;
421 struct ceph_vino vino;
422 ino_t ino;
423
424 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
425 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
426 rinfo->dir_dname_len[off - fi->offset],
427 rinfo->dir_dname[off - fi->offset], in);
428 BUG_ON(!in);
429 ftype = le32_to_cpu(in->mode) >> 12;
430 vino.ino = le64_to_cpu(in->ino);
431 vino.snap = le64_to_cpu(in->snapid);
432 ino = ceph_vino_to_ino(vino);
433 if (!dir_emit(ctx,
434 rinfo->dir_dname[off - fi->offset],
435 rinfo->dir_dname_len[off - fi->offset],
436 ceph_translate_ino(inode->i_sb, ino), ftype)) {
437 dout("filldir stopping us...\n");
438 return 0;
439 }
440 off++;
441 ctx->pos++;
442 }
443
444 if (fi->last_name) {
445 ceph_mdsc_put_request(fi->last_readdir);
446 fi->last_readdir = NULL;
447 goto more;
448 }
449
450 /* more frags? */
451 if (!ceph_frag_is_rightmost(frag)) {
452 frag = ceph_frag_next(frag);
453 off = 0;
454 ctx->pos = ceph_make_fpos(frag, off);
455 dout("readdir next frag is %x\n", frag);
456 goto more;
457 }
458 fi->flags |= CEPH_F_ATEND;
459
460 /*
461 * if dir_release_count still matches the dir, no dentries
462 * were released during the whole readdir, and we should have
463 * the complete dir contents in our cache.
464 */
465 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
466 spin_lock(&ci->i_ceph_lock);
467 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
468 dout(" marking %p complete and ordered\n", inode);
469 /* use i_size to track number of entries in
470 * readdir cache */
471 BUG_ON(fi->readdir_cache_idx < 0);
472 i_size_write(inode, fi->readdir_cache_idx *
473 sizeof(struct dentry*));
474 } else {
475 dout(" marking %p complete\n", inode);
476 }
477 __ceph_dir_set_complete(ci, fi->dir_release_count,
478 fi->dir_ordered_count);
479 spin_unlock(&ci->i_ceph_lock);
480 }
481
482 dout("readdir %p file %p done.\n", inode, file);
483 return 0;
484 }
485
486 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
487 {
488 if (fi->last_readdir) {
489 ceph_mdsc_put_request(fi->last_readdir);
490 fi->last_readdir = NULL;
491 }
492 kfree(fi->last_name);
493 fi->last_name = NULL;
494 fi->dir_release_count = 0;
495 fi->readdir_cache_idx = -1;
496 if (ceph_frag_is_leftmost(frag))
497 fi->next_offset = 2; /* compensate for . and .. */
498 else
499 fi->next_offset = 0;
500 fi->flags &= ~CEPH_F_ATEND;
501 }
502
503 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
504 {
505 struct ceph_file_info *fi = file->private_data;
506 struct inode *inode = file->f_mapping->host;
507 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
508 loff_t retval;
509
510 inode_lock(inode);
511 retval = -EINVAL;
512 switch (whence) {
513 case SEEK_CUR:
514 offset += file->f_pos;
515 case SEEK_SET:
516 break;
517 case SEEK_END:
518 retval = -EOPNOTSUPP;
519 default:
520 goto out;
521 }
522
523 if (offset >= 0) {
524 if (offset != file->f_pos) {
525 file->f_pos = offset;
526 file->f_version = 0;
527 fi->flags &= ~CEPH_F_ATEND;
528 }
529 retval = offset;
530
531 if (offset == 0 ||
532 fpos_frag(offset) != fi->frag ||
533 fpos_off(offset) < fi->offset) {
534 /* discard buffered readdir content on seekdir(0), or
535 * seek to new frag, or seek prior to current chunk */
536 dout("dir_llseek dropping %p content\n", file);
537 reset_readdir(fi, fpos_frag(offset));
538 } else if (fpos_cmp(offset, old_offset) > 0) {
539 /* reset dir_release_count if we did a forward seek */
540 fi->dir_release_count = 0;
541 fi->readdir_cache_idx = -1;
542 }
543 }
544 out:
545 inode_unlock(inode);
546 return retval;
547 }
548
549 /*
550 * Handle lookups for the hidden .snap directory.
551 */
552 int ceph_handle_snapdir(struct ceph_mds_request *req,
553 struct dentry *dentry, int err)
554 {
555 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
556 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
557
558 /* .snap dir? */
559 if (err == -ENOENT &&
560 ceph_snap(parent) == CEPH_NOSNAP &&
561 strcmp(dentry->d_name.name,
562 fsc->mount_options->snapdir_name) == 0) {
563 struct inode *inode = ceph_get_snapdir(parent);
564 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
565 dentry, dentry, inode);
566 BUG_ON(!d_unhashed(dentry));
567 d_add(dentry, inode);
568 err = 0;
569 }
570 return err;
571 }
572
573 /*
574 * Figure out final result of a lookup/open request.
575 *
576 * Mainly, make sure we return the final req->r_dentry (if it already
577 * existed) in place of the original VFS-provided dentry when they
578 * differ.
579 *
580 * Gracefully handle the case where the MDS replies with -ENOENT and
581 * no trace (which it may do, at its discretion, e.g., if it doesn't
582 * care to issue a lease on the negative dentry).
583 */
584 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
585 struct dentry *dentry, int err)
586 {
587 if (err == -ENOENT) {
588 /* no trace? */
589 err = 0;
590 if (!req->r_reply_info.head->is_dentry) {
591 dout("ENOENT and no trace, dentry %p inode %p\n",
592 dentry, d_inode(dentry));
593 if (d_really_is_positive(dentry)) {
594 d_drop(dentry);
595 err = -ENOENT;
596 } else {
597 d_add(dentry, NULL);
598 }
599 }
600 }
601 if (err)
602 dentry = ERR_PTR(err);
603 else if (dentry != req->r_dentry)
604 dentry = dget(req->r_dentry); /* we got spliced */
605 else
606 dentry = NULL;
607 return dentry;
608 }
609
610 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
611 {
612 return ceph_ino(inode) == CEPH_INO_ROOT &&
613 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
614 }
615
616 /*
617 * Look up a single dir entry. If there is a lookup intent, inform
618 * the MDS so that it gets our 'caps wanted' value in a single op.
619 */
620 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
621 unsigned int flags)
622 {
623 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
624 struct ceph_mds_client *mdsc = fsc->mdsc;
625 struct ceph_mds_request *req;
626 int op;
627 int err;
628
629 dout("lookup %p dentry %p '%pd'\n",
630 dir, dentry, dentry);
631
632 if (dentry->d_name.len > NAME_MAX)
633 return ERR_PTR(-ENAMETOOLONG);
634
635 err = ceph_init_dentry(dentry);
636 if (err < 0)
637 return ERR_PTR(err);
638
639 /* can we conclude ENOENT locally? */
640 if (d_really_is_negative(dentry)) {
641 struct ceph_inode_info *ci = ceph_inode(dir);
642 struct ceph_dentry_info *di = ceph_dentry(dentry);
643
644 spin_lock(&ci->i_ceph_lock);
645 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
646 if (strncmp(dentry->d_name.name,
647 fsc->mount_options->snapdir_name,
648 dentry->d_name.len) &&
649 !is_root_ceph_dentry(dir, dentry) &&
650 ceph_test_mount_opt(fsc, DCACHE) &&
651 __ceph_dir_is_complete(ci) &&
652 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
653 spin_unlock(&ci->i_ceph_lock);
654 dout(" dir %p complete, -ENOENT\n", dir);
655 d_add(dentry, NULL);
656 di->lease_shared_gen = ci->i_shared_gen;
657 return NULL;
658 }
659 spin_unlock(&ci->i_ceph_lock);
660 }
661
662 op = ceph_snap(dir) == CEPH_SNAPDIR ?
663 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
664 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
665 if (IS_ERR(req))
666 return ERR_CAST(req);
667 req->r_dentry = dget(dentry);
668 req->r_num_caps = 2;
669 /* we only need inode linkage */
670 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
671 req->r_locked_dir = dir;
672 err = ceph_mdsc_do_request(mdsc, NULL, req);
673 err = ceph_handle_snapdir(req, dentry, err);
674 dentry = ceph_finish_lookup(req, dentry, err);
675 ceph_mdsc_put_request(req); /* will dput(dentry) */
676 dout("lookup result=%p\n", dentry);
677 return dentry;
678 }
679
680 /*
681 * If we do a create but get no trace back from the MDS, follow up with
682 * a lookup (the VFS expects us to link up the provided dentry).
683 */
684 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
685 {
686 struct dentry *result = ceph_lookup(dir, dentry, 0);
687
688 if (result && !IS_ERR(result)) {
689 /*
690 * We created the item, then did a lookup, and found
691 * it was already linked to another inode we already
692 * had in our cache (and thus got spliced). To not
693 * confuse VFS (especially when inode is a directory),
694 * we don't link our dentry to that inode, return an
695 * error instead.
696 *
697 * This event should be rare and it happens only when
698 * we talk to old MDS. Recent MDS does not send traceless
699 * reply for request that creates new inode.
700 */
701 d_drop(result);
702 return -ESTALE;
703 }
704 return PTR_ERR(result);
705 }
706
707 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
708 umode_t mode, dev_t rdev)
709 {
710 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
711 struct ceph_mds_client *mdsc = fsc->mdsc;
712 struct ceph_mds_request *req;
713 struct ceph_acls_info acls = {};
714 int err;
715
716 if (ceph_snap(dir) != CEPH_NOSNAP)
717 return -EROFS;
718
719 err = ceph_pre_init_acls(dir, &mode, &acls);
720 if (err < 0)
721 return err;
722
723 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
724 dir, dentry, mode, rdev);
725 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
726 if (IS_ERR(req)) {
727 err = PTR_ERR(req);
728 goto out;
729 }
730 req->r_dentry = dget(dentry);
731 req->r_num_caps = 2;
732 req->r_locked_dir = dir;
733 req->r_args.mknod.mode = cpu_to_le32(mode);
734 req->r_args.mknod.rdev = cpu_to_le32(rdev);
735 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
736 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
737 if (acls.pagelist) {
738 req->r_pagelist = acls.pagelist;
739 acls.pagelist = NULL;
740 }
741 err = ceph_mdsc_do_request(mdsc, dir, req);
742 if (!err && !req->r_reply_info.head->is_dentry)
743 err = ceph_handle_notrace_create(dir, dentry);
744 ceph_mdsc_put_request(req);
745 out:
746 if (!err)
747 ceph_init_inode_acls(d_inode(dentry), &acls);
748 else
749 d_drop(dentry);
750 ceph_release_acls_info(&acls);
751 return err;
752 }
753
754 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
755 bool excl)
756 {
757 return ceph_mknod(dir, dentry, mode, 0);
758 }
759
760 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
761 const char *dest)
762 {
763 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
764 struct ceph_mds_client *mdsc = fsc->mdsc;
765 struct ceph_mds_request *req;
766 int err;
767
768 if (ceph_snap(dir) != CEPH_NOSNAP)
769 return -EROFS;
770
771 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
772 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
773 if (IS_ERR(req)) {
774 err = PTR_ERR(req);
775 goto out;
776 }
777 req->r_path2 = kstrdup(dest, GFP_KERNEL);
778 if (!req->r_path2) {
779 err = -ENOMEM;
780 ceph_mdsc_put_request(req);
781 goto out;
782 }
783 req->r_locked_dir = dir;
784 req->r_dentry = dget(dentry);
785 req->r_num_caps = 2;
786 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
787 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
788 err = ceph_mdsc_do_request(mdsc, dir, req);
789 if (!err && !req->r_reply_info.head->is_dentry)
790 err = ceph_handle_notrace_create(dir, dentry);
791 ceph_mdsc_put_request(req);
792 out:
793 if (err)
794 d_drop(dentry);
795 return err;
796 }
797
798 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
799 {
800 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
801 struct ceph_mds_client *mdsc = fsc->mdsc;
802 struct ceph_mds_request *req;
803 struct ceph_acls_info acls = {};
804 int err = -EROFS;
805 int op;
806
807 if (ceph_snap(dir) == CEPH_SNAPDIR) {
808 /* mkdir .snap/foo is a MKSNAP */
809 op = CEPH_MDS_OP_MKSNAP;
810 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
811 dentry, dentry);
812 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
813 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
814 op = CEPH_MDS_OP_MKDIR;
815 } else {
816 goto out;
817 }
818
819 mode |= S_IFDIR;
820 err = ceph_pre_init_acls(dir, &mode, &acls);
821 if (err < 0)
822 goto out;
823
824 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
825 if (IS_ERR(req)) {
826 err = PTR_ERR(req);
827 goto out;
828 }
829
830 req->r_dentry = dget(dentry);
831 req->r_num_caps = 2;
832 req->r_locked_dir = dir;
833 req->r_args.mkdir.mode = cpu_to_le32(mode);
834 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
835 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
836 if (acls.pagelist) {
837 req->r_pagelist = acls.pagelist;
838 acls.pagelist = NULL;
839 }
840 err = ceph_mdsc_do_request(mdsc, dir, req);
841 if (!err &&
842 !req->r_reply_info.head->is_target &&
843 !req->r_reply_info.head->is_dentry)
844 err = ceph_handle_notrace_create(dir, dentry);
845 ceph_mdsc_put_request(req);
846 out:
847 if (!err)
848 ceph_init_inode_acls(d_inode(dentry), &acls);
849 else
850 d_drop(dentry);
851 ceph_release_acls_info(&acls);
852 return err;
853 }
854
855 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
856 struct dentry *dentry)
857 {
858 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
859 struct ceph_mds_client *mdsc = fsc->mdsc;
860 struct ceph_mds_request *req;
861 int err;
862
863 if (ceph_snap(dir) != CEPH_NOSNAP)
864 return -EROFS;
865
866 dout("link in dir %p old_dentry %p dentry %p\n", dir,
867 old_dentry, dentry);
868 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
869 if (IS_ERR(req)) {
870 d_drop(dentry);
871 return PTR_ERR(req);
872 }
873 req->r_dentry = dget(dentry);
874 req->r_num_caps = 2;
875 req->r_old_dentry = dget(old_dentry);
876 req->r_locked_dir = dir;
877 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
878 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
879 /* release LINK_SHARED on source inode (mds will lock it) */
880 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
881 err = ceph_mdsc_do_request(mdsc, dir, req);
882 if (err) {
883 d_drop(dentry);
884 } else if (!req->r_reply_info.head->is_dentry) {
885 ihold(d_inode(old_dentry));
886 d_instantiate(dentry, d_inode(old_dentry));
887 }
888 ceph_mdsc_put_request(req);
889 return err;
890 }
891
892 /*
893 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
894 * looks like the link count will hit 0, drop any other caps (other
895 * than PIN) we don't specifically want (due to the file still being
896 * open).
897 */
898 static int drop_caps_for_unlink(struct inode *inode)
899 {
900 struct ceph_inode_info *ci = ceph_inode(inode);
901 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
902
903 spin_lock(&ci->i_ceph_lock);
904 if (inode->i_nlink == 1) {
905 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
906 ci->i_ceph_flags |= CEPH_I_NODELAY;
907 }
908 spin_unlock(&ci->i_ceph_lock);
909 return drop;
910 }
911
912 /*
913 * rmdir and unlink are differ only by the metadata op code
914 */
915 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
916 {
917 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
918 struct ceph_mds_client *mdsc = fsc->mdsc;
919 struct inode *inode = d_inode(dentry);
920 struct ceph_mds_request *req;
921 int err = -EROFS;
922 int op;
923
924 if (ceph_snap(dir) == CEPH_SNAPDIR) {
925 /* rmdir .snap/foo is RMSNAP */
926 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
927 op = CEPH_MDS_OP_RMSNAP;
928 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
929 dout("unlink/rmdir dir %p dn %p inode %p\n",
930 dir, dentry, inode);
931 op = d_is_dir(dentry) ?
932 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
933 } else
934 goto out;
935 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
936 if (IS_ERR(req)) {
937 err = PTR_ERR(req);
938 goto out;
939 }
940 req->r_dentry = dget(dentry);
941 req->r_num_caps = 2;
942 req->r_locked_dir = dir;
943 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
944 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
945 req->r_inode_drop = drop_caps_for_unlink(inode);
946 err = ceph_mdsc_do_request(mdsc, dir, req);
947 if (!err && !req->r_reply_info.head->is_dentry)
948 d_delete(dentry);
949 ceph_mdsc_put_request(req);
950 out:
951 return err;
952 }
953
954 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
955 struct inode *new_dir, struct dentry *new_dentry)
956 {
957 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
958 struct ceph_mds_client *mdsc = fsc->mdsc;
959 struct ceph_mds_request *req;
960 int op = CEPH_MDS_OP_RENAME;
961 int err;
962
963 if (ceph_snap(old_dir) != ceph_snap(new_dir))
964 return -EXDEV;
965 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
966 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
967 op = CEPH_MDS_OP_RENAMESNAP;
968 else
969 return -EROFS;
970 }
971 dout("rename dir %p dentry %p to dir %p dentry %p\n",
972 old_dir, old_dentry, new_dir, new_dentry);
973 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
974 if (IS_ERR(req))
975 return PTR_ERR(req);
976 ihold(old_dir);
977 req->r_dentry = dget(new_dentry);
978 req->r_num_caps = 2;
979 req->r_old_dentry = dget(old_dentry);
980 req->r_old_dentry_dir = old_dir;
981 req->r_locked_dir = new_dir;
982 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
983 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
984 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
985 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
986 /* release LINK_RDCACHE on source inode (mds will lock it) */
987 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
988 if (d_really_is_positive(new_dentry))
989 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
990 err = ceph_mdsc_do_request(mdsc, old_dir, req);
991 if (!err && !req->r_reply_info.head->is_dentry) {
992 /*
993 * Normally d_move() is done by fill_trace (called by
994 * do_request, above). If there is no trace, we need
995 * to do it here.
996 */
997
998 /* d_move screws up sibling dentries' offsets */
999 ceph_dir_clear_complete(old_dir);
1000 ceph_dir_clear_complete(new_dir);
1001
1002 d_move(old_dentry, new_dentry);
1003
1004 /* ensure target dentry is invalidated, despite
1005 rehashing bug in vfs_rename_dir */
1006 ceph_invalidate_dentry_lease(new_dentry);
1007 }
1008 ceph_mdsc_put_request(req);
1009 return err;
1010 }
1011
1012 /*
1013 * Ensure a dentry lease will no longer revalidate.
1014 */
1015 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1016 {
1017 spin_lock(&dentry->d_lock);
1018 dentry->d_time = jiffies;
1019 ceph_dentry(dentry)->lease_shared_gen = 0;
1020 spin_unlock(&dentry->d_lock);
1021 }
1022
1023 /*
1024 * Check if dentry lease is valid. If not, delete the lease. Try to
1025 * renew if the least is more than half up.
1026 */
1027 static int dentry_lease_is_valid(struct dentry *dentry)
1028 {
1029 struct ceph_dentry_info *di;
1030 struct ceph_mds_session *s;
1031 int valid = 0;
1032 u32 gen;
1033 unsigned long ttl;
1034 struct ceph_mds_session *session = NULL;
1035 struct inode *dir = NULL;
1036 u32 seq = 0;
1037
1038 spin_lock(&dentry->d_lock);
1039 di = ceph_dentry(dentry);
1040 if (di->lease_session) {
1041 s = di->lease_session;
1042 spin_lock(&s->s_gen_ttl_lock);
1043 gen = s->s_cap_gen;
1044 ttl = s->s_cap_ttl;
1045 spin_unlock(&s->s_gen_ttl_lock);
1046
1047 if (di->lease_gen == gen &&
1048 time_before(jiffies, dentry->d_time) &&
1049 time_before(jiffies, ttl)) {
1050 valid = 1;
1051 if (di->lease_renew_after &&
1052 time_after(jiffies, di->lease_renew_after)) {
1053 /* we should renew */
1054 dir = d_inode(dentry->d_parent);
1055 session = ceph_get_mds_session(s);
1056 seq = di->lease_seq;
1057 di->lease_renew_after = 0;
1058 di->lease_renew_from = jiffies;
1059 }
1060 }
1061 }
1062 spin_unlock(&dentry->d_lock);
1063
1064 if (session) {
1065 ceph_mdsc_lease_send_msg(session, dir, dentry,
1066 CEPH_MDS_LEASE_RENEW, seq);
1067 ceph_put_mds_session(session);
1068 }
1069 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1070 return valid;
1071 }
1072
1073 /*
1074 * Check if directory-wide content lease/cap is valid.
1075 */
1076 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1077 {
1078 struct ceph_inode_info *ci = ceph_inode(dir);
1079 struct ceph_dentry_info *di = ceph_dentry(dentry);
1080 int valid = 0;
1081
1082 spin_lock(&ci->i_ceph_lock);
1083 if (ci->i_shared_gen == di->lease_shared_gen)
1084 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1085 spin_unlock(&ci->i_ceph_lock);
1086 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1087 dir, (unsigned)ci->i_shared_gen, dentry,
1088 (unsigned)di->lease_shared_gen, valid);
1089 return valid;
1090 }
1091
1092 /*
1093 * Check if cached dentry can be trusted.
1094 */
1095 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1096 {
1097 int valid = 0;
1098 struct inode *dir;
1099
1100 if (flags & LOOKUP_RCU)
1101 return -ECHILD;
1102
1103 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1104 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1105
1106 dir = ceph_get_dentry_parent_inode(dentry);
1107
1108 /* always trust cached snapped dentries, snapdir dentry */
1109 if (ceph_snap(dir) != CEPH_NOSNAP) {
1110 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1111 dentry, d_inode(dentry));
1112 valid = 1;
1113 } else if (d_really_is_positive(dentry) &&
1114 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1115 valid = 1;
1116 } else if (dentry_lease_is_valid(dentry) ||
1117 dir_lease_is_valid(dir, dentry)) {
1118 if (d_really_is_positive(dentry))
1119 valid = ceph_is_any_caps(d_inode(dentry));
1120 else
1121 valid = 1;
1122 }
1123
1124 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1125 if (valid) {
1126 ceph_dentry_lru_touch(dentry);
1127 } else {
1128 ceph_dir_clear_complete(dir);
1129 }
1130 iput(dir);
1131 return valid;
1132 }
1133
1134 /*
1135 * Release our ceph_dentry_info.
1136 */
1137 static void ceph_d_release(struct dentry *dentry)
1138 {
1139 struct ceph_dentry_info *di = ceph_dentry(dentry);
1140
1141 dout("d_release %p\n", dentry);
1142 ceph_dentry_lru_del(dentry);
1143 if (di->lease_session)
1144 ceph_put_mds_session(di->lease_session);
1145 kmem_cache_free(ceph_dentry_cachep, di);
1146 dentry->d_fsdata = NULL;
1147 }
1148
1149 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1150 unsigned int flags)
1151 {
1152 /*
1153 * Eventually, we'll want to revalidate snapped metadata
1154 * too... probably...
1155 */
1156 return 1;
1157 }
1158
1159 /*
1160 * When the VFS prunes a dentry from the cache, we need to clear the
1161 * complete flag on the parent directory.
1162 *
1163 * Called under dentry->d_lock.
1164 */
1165 static void ceph_d_prune(struct dentry *dentry)
1166 {
1167 dout("ceph_d_prune %p\n", dentry);
1168
1169 /* do we have a valid parent? */
1170 if (IS_ROOT(dentry))
1171 return;
1172
1173 /* if we are not hashed, we don't affect dir's completeness */
1174 if (d_unhashed(dentry))
1175 return;
1176
1177 /*
1178 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1179 * cleared until d_release
1180 */
1181 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1182 }
1183
1184 /*
1185 * read() on a dir. This weird interface hack only works if mounted
1186 * with '-o dirstat'.
1187 */
1188 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1189 loff_t *ppos)
1190 {
1191 struct ceph_file_info *cf = file->private_data;
1192 struct inode *inode = file_inode(file);
1193 struct ceph_inode_info *ci = ceph_inode(inode);
1194 int left;
1195 const int bufsize = 1024;
1196
1197 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1198 return -EISDIR;
1199
1200 if (!cf->dir_info) {
1201 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1202 if (!cf->dir_info)
1203 return -ENOMEM;
1204 cf->dir_info_len =
1205 snprintf(cf->dir_info, bufsize,
1206 "entries: %20lld\n"
1207 " files: %20lld\n"
1208 " subdirs: %20lld\n"
1209 "rentries: %20lld\n"
1210 " rfiles: %20lld\n"
1211 " rsubdirs: %20lld\n"
1212 "rbytes: %20lld\n"
1213 "rctime: %10ld.%09ld\n",
1214 ci->i_files + ci->i_subdirs,
1215 ci->i_files,
1216 ci->i_subdirs,
1217 ci->i_rfiles + ci->i_rsubdirs,
1218 ci->i_rfiles,
1219 ci->i_rsubdirs,
1220 ci->i_rbytes,
1221 (long)ci->i_rctime.tv_sec,
1222 (long)ci->i_rctime.tv_nsec);
1223 }
1224
1225 if (*ppos >= cf->dir_info_len)
1226 return 0;
1227 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1228 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1229 if (left == size)
1230 return -EFAULT;
1231 *ppos += (size - left);
1232 return size - left;
1233 }
1234
1235 /*
1236 * We maintain a private dentry LRU.
1237 *
1238 * FIXME: this needs to be changed to a per-mds lru to be useful.
1239 */
1240 void ceph_dentry_lru_add(struct dentry *dn)
1241 {
1242 struct ceph_dentry_info *di = ceph_dentry(dn);
1243 struct ceph_mds_client *mdsc;
1244
1245 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1246 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1247 spin_lock(&mdsc->dentry_lru_lock);
1248 list_add_tail(&di->lru, &mdsc->dentry_lru);
1249 mdsc->num_dentry++;
1250 spin_unlock(&mdsc->dentry_lru_lock);
1251 }
1252
1253 void ceph_dentry_lru_touch(struct dentry *dn)
1254 {
1255 struct ceph_dentry_info *di = ceph_dentry(dn);
1256 struct ceph_mds_client *mdsc;
1257
1258 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1259 di->offset);
1260 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1261 spin_lock(&mdsc->dentry_lru_lock);
1262 list_move_tail(&di->lru, &mdsc->dentry_lru);
1263 spin_unlock(&mdsc->dentry_lru_lock);
1264 }
1265
1266 void ceph_dentry_lru_del(struct dentry *dn)
1267 {
1268 struct ceph_dentry_info *di = ceph_dentry(dn);
1269 struct ceph_mds_client *mdsc;
1270
1271 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1272 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1273 spin_lock(&mdsc->dentry_lru_lock);
1274 list_del_init(&di->lru);
1275 mdsc->num_dentry--;
1276 spin_unlock(&mdsc->dentry_lru_lock);
1277 }
1278
1279 /*
1280 * Return name hash for a given dentry. This is dependent on
1281 * the parent directory's hash function.
1282 */
1283 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1284 {
1285 struct ceph_inode_info *dci = ceph_inode(dir);
1286
1287 switch (dci->i_dir_layout.dl_dir_hash) {
1288 case 0: /* for backward compat */
1289 case CEPH_STR_HASH_LINUX:
1290 return dn->d_name.hash;
1291
1292 default:
1293 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1294 dn->d_name.name, dn->d_name.len);
1295 }
1296 }
1297
1298 const struct file_operations ceph_dir_fops = {
1299 .read = ceph_read_dir,
1300 .iterate = ceph_readdir,
1301 .llseek = ceph_dir_llseek,
1302 .open = ceph_open,
1303 .release = ceph_release,
1304 .unlocked_ioctl = ceph_ioctl,
1305 .fsync = ceph_fsync,
1306 };
1307
1308 const struct file_operations ceph_snapdir_fops = {
1309 .iterate = ceph_readdir,
1310 .llseek = ceph_dir_llseek,
1311 .open = ceph_open,
1312 .release = ceph_release,
1313 };
1314
1315 const struct inode_operations ceph_dir_iops = {
1316 .lookup = ceph_lookup,
1317 .permission = ceph_permission,
1318 .getattr = ceph_getattr,
1319 .setattr = ceph_setattr,
1320 .setxattr = ceph_setxattr,
1321 .getxattr = ceph_getxattr,
1322 .listxattr = ceph_listxattr,
1323 .removexattr = ceph_removexattr,
1324 .get_acl = ceph_get_acl,
1325 .set_acl = ceph_set_acl,
1326 .mknod = ceph_mknod,
1327 .symlink = ceph_symlink,
1328 .mkdir = ceph_mkdir,
1329 .link = ceph_link,
1330 .unlink = ceph_unlink,
1331 .rmdir = ceph_unlink,
1332 .rename = ceph_rename,
1333 .create = ceph_create,
1334 .atomic_open = ceph_atomic_open,
1335 };
1336
1337 const struct inode_operations ceph_snapdir_iops = {
1338 .lookup = ceph_lookup,
1339 .permission = ceph_permission,
1340 .getattr = ceph_getattr,
1341 .mkdir = ceph_mkdir,
1342 .rmdir = ceph_unlink,
1343 .rename = ceph_rename,
1344 };
1345
1346 const struct dentry_operations ceph_dentry_ops = {
1347 .d_revalidate = ceph_d_revalidate,
1348 .d_release = ceph_d_release,
1349 .d_prune = ceph_d_prune,
1350 };
1351
1352 const struct dentry_operations ceph_snapdir_dentry_ops = {
1353 .d_revalidate = ceph_snapdir_d_revalidate,
1354 .d_release = ceph_d_release,
1355 };
1356
1357 const struct dentry_operations ceph_snap_dentry_ops = {
1358 .d_release = ceph_d_release,
1359 .d_prune = ceph_d_prune,
1360 };
Linux with added FPC-III support