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[mirror_ubuntu-hirsute-kernel.git] / fs / ceph / dir.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/spinlock.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
8 #include <linux/xattr.h>
9
10 #include "super.h"
11 #include "mds_client.h"
12
13 /*
14 * Directory operations: readdir, lookup, create, link, unlink,
15 * rename, etc.
16 */
17
18 /*
19 * Ceph MDS operations are specified in terms of a base ino and
20 * relative path. Thus, the client can specify an operation on a
21 * specific inode (e.g., a getattr due to fstat(2)), or as a path
22 * relative to, say, the root directory.
23 *
24 * Normally, we limit ourselves to strict inode ops (no path component)
25 * or dentry operations (a single path component relative to an ino). The
26 * exception to this is open_root_dentry(), which will open the mount
27 * point by name.
28 */
29
30 const struct dentry_operations ceph_dentry_ops;
31
32 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
33 static int __dir_lease_try_check(const struct dentry *dentry);
34
35 /*
36 * Initialize ceph dentry state.
37 */
38 static int ceph_d_init(struct dentry *dentry)
39 {
40 struct ceph_dentry_info *di;
41 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);
42
43 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
44 if (!di)
45 return -ENOMEM; /* oh well */
46
47 di->dentry = dentry;
48 di->lease_session = NULL;
49 di->time = jiffies;
50 dentry->d_fsdata = di;
51 INIT_LIST_HEAD(&di->lease_list);
52
53 atomic64_inc(&mdsc->metric.total_dentries);
54
55 return 0;
56 }
57
58 /*
59 * for f_pos for readdir:
60 * - hash order:
61 * (0xff << 52) | ((24 bits hash) << 28) |
62 * (the nth entry has hash collision);
63 * - frag+name order;
64 * ((frag value) << 28) | (the nth entry in frag);
65 */
66 #define OFFSET_BITS 28
67 #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
68 #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
69 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
70 {
71 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
72 if (hash_order)
73 fpos |= HASH_ORDER;
74 return fpos;
75 }
76
77 static bool is_hash_order(loff_t p)
78 {
79 return (p & HASH_ORDER) == HASH_ORDER;
80 }
81
82 static unsigned fpos_frag(loff_t p)
83 {
84 return p >> OFFSET_BITS;
85 }
86
87 static unsigned fpos_hash(loff_t p)
88 {
89 return ceph_frag_value(fpos_frag(p));
90 }
91
92 static unsigned fpos_off(loff_t p)
93 {
94 return p & OFFSET_MASK;
95 }
96
97 static int fpos_cmp(loff_t l, loff_t r)
98 {
99 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
100 if (v)
101 return v;
102 return (int)(fpos_off(l) - fpos_off(r));
103 }
104
105 /*
106 * make note of the last dentry we read, so we can
107 * continue at the same lexicographical point,
108 * regardless of what dir changes take place on the
109 * server.
110 */
111 static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
112 int len, unsigned next_offset)
113 {
114 char *buf = kmalloc(len+1, GFP_KERNEL);
115 if (!buf)
116 return -ENOMEM;
117 kfree(dfi->last_name);
118 dfi->last_name = buf;
119 memcpy(dfi->last_name, name, len);
120 dfi->last_name[len] = 0;
121 dfi->next_offset = next_offset;
122 dout("note_last_dentry '%s'\n", dfi->last_name);
123 return 0;
124 }
125
126
127 static struct dentry *
128 __dcache_find_get_entry(struct dentry *parent, u64 idx,
129 struct ceph_readdir_cache_control *cache_ctl)
130 {
131 struct inode *dir = d_inode(parent);
132 struct dentry *dentry;
133 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
134 loff_t ptr_pos = idx * sizeof(struct dentry *);
135 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
136
137 if (ptr_pos >= i_size_read(dir))
138 return NULL;
139
140 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
141 ceph_readdir_cache_release(cache_ctl);
142 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
143 if (!cache_ctl->page) {
144 dout(" page %lu not found\n", ptr_pgoff);
145 return ERR_PTR(-EAGAIN);
146 }
147 /* reading/filling the cache are serialized by
148 i_mutex, no need to use page lock */
149 unlock_page(cache_ctl->page);
150 cache_ctl->dentries = kmap(cache_ctl->page);
151 }
152
153 cache_ctl->index = idx & idx_mask;
154
155 rcu_read_lock();
156 spin_lock(&parent->d_lock);
157 /* check i_size again here, because empty directory can be
158 * marked as complete while not holding the i_mutex. */
159 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
160 dentry = cache_ctl->dentries[cache_ctl->index];
161 else
162 dentry = NULL;
163 spin_unlock(&parent->d_lock);
164 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
165 dentry = NULL;
166 rcu_read_unlock();
167 return dentry ? : ERR_PTR(-EAGAIN);
168 }
169
170 /*
171 * When possible, we try to satisfy a readdir by peeking at the
172 * dcache. We make this work by carefully ordering dentries on
173 * d_child when we initially get results back from the MDS, and
174 * falling back to a "normal" sync readdir if any dentries in the dir
175 * are dropped.
176 *
177 * Complete dir indicates that we have all dentries in the dir. It is
178 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
179 * the MDS if/when the directory is modified).
180 */
181 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
182 int shared_gen)
183 {
184 struct ceph_dir_file_info *dfi = file->private_data;
185 struct dentry *parent = file->f_path.dentry;
186 struct inode *dir = d_inode(parent);
187 struct dentry *dentry, *last = NULL;
188 struct ceph_dentry_info *di;
189 struct ceph_readdir_cache_control cache_ctl = {};
190 u64 idx = 0;
191 int err = 0;
192
193 dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
194
195 /* search start position */
196 if (ctx->pos > 2) {
197 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
198 while (count > 0) {
199 u64 step = count >> 1;
200 dentry = __dcache_find_get_entry(parent, idx + step,
201 &cache_ctl);
202 if (!dentry) {
203 /* use linar search */
204 idx = 0;
205 break;
206 }
207 if (IS_ERR(dentry)) {
208 err = PTR_ERR(dentry);
209 goto out;
210 }
211 di = ceph_dentry(dentry);
212 spin_lock(&dentry->d_lock);
213 if (fpos_cmp(di->offset, ctx->pos) < 0) {
214 idx += step + 1;
215 count -= step + 1;
216 } else {
217 count = step;
218 }
219 spin_unlock(&dentry->d_lock);
220 dput(dentry);
221 }
222
223 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
224 }
225
226
227 for (;;) {
228 bool emit_dentry = false;
229 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
230 if (!dentry) {
231 dfi->file_info.flags |= CEPH_F_ATEND;
232 err = 0;
233 break;
234 }
235 if (IS_ERR(dentry)) {
236 err = PTR_ERR(dentry);
237 goto out;
238 }
239
240 spin_lock(&dentry->d_lock);
241 di = ceph_dentry(dentry);
242 if (d_unhashed(dentry) ||
243 d_really_is_negative(dentry) ||
244 di->lease_shared_gen != shared_gen) {
245 spin_unlock(&dentry->d_lock);
246 dput(dentry);
247 err = -EAGAIN;
248 goto out;
249 }
250 if (fpos_cmp(ctx->pos, di->offset) <= 0) {
251 __ceph_dentry_dir_lease_touch(di);
252 emit_dentry = true;
253 }
254 spin_unlock(&dentry->d_lock);
255
256 if (emit_dentry) {
257 dout(" %llx dentry %p %pd %p\n", di->offset,
258 dentry, dentry, d_inode(dentry));
259 ctx->pos = di->offset;
260 if (!dir_emit(ctx, dentry->d_name.name,
261 dentry->d_name.len, ceph_present_inode(d_inode(dentry)),
262 d_inode(dentry)->i_mode >> 12)) {
263 dput(dentry);
264 err = 0;
265 break;
266 }
267 ctx->pos++;
268
269 if (last)
270 dput(last);
271 last = dentry;
272 } else {
273 dput(dentry);
274 }
275 }
276 out:
277 ceph_readdir_cache_release(&cache_ctl);
278 if (last) {
279 int ret;
280 di = ceph_dentry(last);
281 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
282 fpos_off(di->offset) + 1);
283 if (ret < 0)
284 err = ret;
285 dput(last);
286 /* last_name no longer match cache index */
287 if (dfi->readdir_cache_idx >= 0) {
288 dfi->readdir_cache_idx = -1;
289 dfi->dir_release_count = 0;
290 }
291 }
292 return err;
293 }
294
295 static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
296 {
297 if (!dfi->last_readdir)
298 return true;
299 if (is_hash_order(pos))
300 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
301 else
302 return dfi->frag != fpos_frag(pos);
303 }
304
305 static int ceph_readdir(struct file *file, struct dir_context *ctx)
306 {
307 struct ceph_dir_file_info *dfi = file->private_data;
308 struct inode *inode = file_inode(file);
309 struct ceph_inode_info *ci = ceph_inode(inode);
310 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
311 struct ceph_mds_client *mdsc = fsc->mdsc;
312 int i;
313 int err;
314 unsigned frag = -1;
315 struct ceph_mds_reply_info_parsed *rinfo;
316
317 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
318 if (dfi->file_info.flags & CEPH_F_ATEND)
319 return 0;
320
321 /* always start with . and .. */
322 if (ctx->pos == 0) {
323 dout("readdir off 0 -> '.'\n");
324 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),
325 inode->i_mode >> 12))
326 return 0;
327 ctx->pos = 1;
328 }
329 if (ctx->pos == 1) {
330 u64 ino;
331 struct dentry *dentry = file->f_path.dentry;
332
333 spin_lock(&dentry->d_lock);
334 ino = ceph_present_inode(dentry->d_parent->d_inode);
335 spin_unlock(&dentry->d_lock);
336
337 dout("readdir off 1 -> '..'\n");
338 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))
339 return 0;
340 ctx->pos = 2;
341 }
342
343 spin_lock(&ci->i_ceph_lock);
344 /* request Fx cap. if have Fx, we don't need to release Fs cap
345 * for later create/unlink. */
346 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
347 /* can we use the dcache? */
348 if (ceph_test_mount_opt(fsc, DCACHE) &&
349 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
350 ceph_snap(inode) != CEPH_SNAPDIR &&
351 __ceph_dir_is_complete_ordered(ci) &&
352 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
353 int shared_gen = atomic_read(&ci->i_shared_gen);
354
355 spin_unlock(&ci->i_ceph_lock);
356 err = __dcache_readdir(file, ctx, shared_gen);
357 if (err != -EAGAIN)
358 return err;
359 } else {
360 spin_unlock(&ci->i_ceph_lock);
361 }
362
363 /* proceed with a normal readdir */
364 more:
365 /* do we have the correct frag content buffered? */
366 if (need_send_readdir(dfi, ctx->pos)) {
367 struct ceph_mds_request *req;
368 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
369 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
370
371 /* discard old result, if any */
372 if (dfi->last_readdir) {
373 ceph_mdsc_put_request(dfi->last_readdir);
374 dfi->last_readdir = NULL;
375 }
376
377 if (is_hash_order(ctx->pos)) {
378 /* fragtree isn't always accurate. choose frag
379 * based on previous reply when possible. */
380 if (frag == (unsigned)-1)
381 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
382 NULL, NULL);
383 } else {
384 frag = fpos_frag(ctx->pos);
385 }
386
387 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
388 ceph_vinop(inode), frag, dfi->last_name);
389 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
390 if (IS_ERR(req))
391 return PTR_ERR(req);
392 err = ceph_alloc_readdir_reply_buffer(req, inode);
393 if (err) {
394 ceph_mdsc_put_request(req);
395 return err;
396 }
397 /* hints to request -> mds selection code */
398 req->r_direct_mode = USE_AUTH_MDS;
399 if (op == CEPH_MDS_OP_READDIR) {
400 req->r_direct_hash = ceph_frag_value(frag);
401 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
402 req->r_inode_drop = CEPH_CAP_FILE_EXCL;
403 }
404 if (dfi->last_name) {
405 req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
406 if (!req->r_path2) {
407 ceph_mdsc_put_request(req);
408 return -ENOMEM;
409 }
410 } else if (is_hash_order(ctx->pos)) {
411 req->r_args.readdir.offset_hash =
412 cpu_to_le32(fpos_hash(ctx->pos));
413 }
414
415 req->r_dir_release_cnt = dfi->dir_release_count;
416 req->r_dir_ordered_cnt = dfi->dir_ordered_count;
417 req->r_readdir_cache_idx = dfi->readdir_cache_idx;
418 req->r_readdir_offset = dfi->next_offset;
419 req->r_args.readdir.frag = cpu_to_le32(frag);
420 req->r_args.readdir.flags =
421 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
422
423 req->r_inode = inode;
424 ihold(inode);
425 req->r_dentry = dget(file->f_path.dentry);
426 err = ceph_mdsc_do_request(mdsc, NULL, req);
427 if (err < 0) {
428 ceph_mdsc_put_request(req);
429 return err;
430 }
431 dout("readdir got and parsed readdir result=%d on "
432 "frag %x, end=%d, complete=%d, hash_order=%d\n",
433 err, frag,
434 (int)req->r_reply_info.dir_end,
435 (int)req->r_reply_info.dir_complete,
436 (int)req->r_reply_info.hash_order);
437
438 rinfo = &req->r_reply_info;
439 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
440 frag = le32_to_cpu(rinfo->dir_dir->frag);
441 if (!rinfo->hash_order) {
442 dfi->next_offset = req->r_readdir_offset;
443 /* adjust ctx->pos to beginning of frag */
444 ctx->pos = ceph_make_fpos(frag,
445 dfi->next_offset,
446 false);
447 }
448 }
449
450 dfi->frag = frag;
451 dfi->last_readdir = req;
452
453 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
454 dfi->readdir_cache_idx = req->r_readdir_cache_idx;
455 if (dfi->readdir_cache_idx < 0) {
456 /* preclude from marking dir ordered */
457 dfi->dir_ordered_count = 0;
458 } else if (ceph_frag_is_leftmost(frag) &&
459 dfi->next_offset == 2) {
460 /* note dir version at start of readdir so
461 * we can tell if any dentries get dropped */
462 dfi->dir_release_count = req->r_dir_release_cnt;
463 dfi->dir_ordered_count = req->r_dir_ordered_cnt;
464 }
465 } else {
466 dout("readdir !did_prepopulate\n");
467 /* disable readdir cache */
468 dfi->readdir_cache_idx = -1;
469 /* preclude from marking dir complete */
470 dfi->dir_release_count = 0;
471 }
472
473 /* note next offset and last dentry name */
474 if (rinfo->dir_nr > 0) {
475 struct ceph_mds_reply_dir_entry *rde =
476 rinfo->dir_entries + (rinfo->dir_nr-1);
477 unsigned next_offset = req->r_reply_info.dir_end ?
478 2 : (fpos_off(rde->offset) + 1);
479 err = note_last_dentry(dfi, rde->name, rde->name_len,
480 next_offset);
481 if (err)
482 return err;
483 } else if (req->r_reply_info.dir_end) {
484 dfi->next_offset = 2;
485 /* keep last name */
486 }
487 }
488
489 rinfo = &dfi->last_readdir->r_reply_info;
490 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
491 dfi->frag, rinfo->dir_nr, ctx->pos,
492 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
493
494 i = 0;
495 /* search start position */
496 if (rinfo->dir_nr > 0) {
497 int step, nr = rinfo->dir_nr;
498 while (nr > 0) {
499 step = nr >> 1;
500 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
501 i += step + 1;
502 nr -= step + 1;
503 } else {
504 nr = step;
505 }
506 }
507 }
508 for (; i < rinfo->dir_nr; i++) {
509 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
510
511 BUG_ON(rde->offset < ctx->pos);
512
513 ctx->pos = rde->offset;
514 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
515 i, rinfo->dir_nr, ctx->pos,
516 rde->name_len, rde->name, &rde->inode.in);
517
518 BUG_ON(!rde->inode.in);
519
520 if (!dir_emit(ctx, rde->name, rde->name_len,
521 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),
522 le32_to_cpu(rde->inode.in->mode) >> 12)) {
523 dout("filldir stopping us...\n");
524 return 0;
525 }
526 ctx->pos++;
527 }
528
529 ceph_mdsc_put_request(dfi->last_readdir);
530 dfi->last_readdir = NULL;
531
532 if (dfi->next_offset > 2) {
533 frag = dfi->frag;
534 goto more;
535 }
536
537 /* more frags? */
538 if (!ceph_frag_is_rightmost(dfi->frag)) {
539 frag = ceph_frag_next(dfi->frag);
540 if (is_hash_order(ctx->pos)) {
541 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
542 dfi->next_offset, true);
543 if (new_pos > ctx->pos)
544 ctx->pos = new_pos;
545 /* keep last_name */
546 } else {
547 ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
548 false);
549 kfree(dfi->last_name);
550 dfi->last_name = NULL;
551 }
552 dout("readdir next frag is %x\n", frag);
553 goto more;
554 }
555 dfi->file_info.flags |= CEPH_F_ATEND;
556
557 /*
558 * if dir_release_count still matches the dir, no dentries
559 * were released during the whole readdir, and we should have
560 * the complete dir contents in our cache.
561 */
562 if (atomic64_read(&ci->i_release_count) ==
563 dfi->dir_release_count) {
564 spin_lock(&ci->i_ceph_lock);
565 if (dfi->dir_ordered_count ==
566 atomic64_read(&ci->i_ordered_count)) {
567 dout(" marking %p complete and ordered\n", inode);
568 /* use i_size to track number of entries in
569 * readdir cache */
570 BUG_ON(dfi->readdir_cache_idx < 0);
571 i_size_write(inode, dfi->readdir_cache_idx *
572 sizeof(struct dentry*));
573 } else {
574 dout(" marking %p complete\n", inode);
575 }
576 __ceph_dir_set_complete(ci, dfi->dir_release_count,
577 dfi->dir_ordered_count);
578 spin_unlock(&ci->i_ceph_lock);
579 }
580
581 dout("readdir %p file %p done.\n", inode, file);
582 return 0;
583 }
584
585 static void reset_readdir(struct ceph_dir_file_info *dfi)
586 {
587 if (dfi->last_readdir) {
588 ceph_mdsc_put_request(dfi->last_readdir);
589 dfi->last_readdir = NULL;
590 }
591 kfree(dfi->last_name);
592 dfi->last_name = NULL;
593 dfi->dir_release_count = 0;
594 dfi->readdir_cache_idx = -1;
595 dfi->next_offset = 2; /* compensate for . and .. */
596 dfi->file_info.flags &= ~CEPH_F_ATEND;
597 }
598
599 /*
600 * discard buffered readdir content on seekdir(0), or seek to new frag,
601 * or seek prior to current chunk
602 */
603 static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
604 {
605 struct ceph_mds_reply_info_parsed *rinfo;
606 loff_t chunk_offset;
607 if (new_pos == 0)
608 return true;
609 if (is_hash_order(new_pos)) {
610 /* no need to reset last_name for a forward seek when
611 * dentries are sotred in hash order */
612 } else if (dfi->frag != fpos_frag(new_pos)) {
613 return true;
614 }
615 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
616 if (!rinfo || !rinfo->dir_nr)
617 return true;
618 chunk_offset = rinfo->dir_entries[0].offset;
619 return new_pos < chunk_offset ||
620 is_hash_order(new_pos) != is_hash_order(chunk_offset);
621 }
622
623 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
624 {
625 struct ceph_dir_file_info *dfi = file->private_data;
626 struct inode *inode = file->f_mapping->host;
627 loff_t retval;
628
629 inode_lock(inode);
630 retval = -EINVAL;
631 switch (whence) {
632 case SEEK_CUR:
633 offset += file->f_pos;
634 case SEEK_SET:
635 break;
636 case SEEK_END:
637 retval = -EOPNOTSUPP;
638 default:
639 goto out;
640 }
641
642 if (offset >= 0) {
643 if (need_reset_readdir(dfi, offset)) {
644 dout("dir_llseek dropping %p content\n", file);
645 reset_readdir(dfi);
646 } else if (is_hash_order(offset) && offset > file->f_pos) {
647 /* for hash offset, we don't know if a forward seek
648 * is within same frag */
649 dfi->dir_release_count = 0;
650 dfi->readdir_cache_idx = -1;
651 }
652
653 if (offset != file->f_pos) {
654 file->f_pos = offset;
655 file->f_version = 0;
656 dfi->file_info.flags &= ~CEPH_F_ATEND;
657 }
658 retval = offset;
659 }
660 out:
661 inode_unlock(inode);
662 return retval;
663 }
664
665 /*
666 * Handle lookups for the hidden .snap directory.
667 */
668 int ceph_handle_snapdir(struct ceph_mds_request *req,
669 struct dentry *dentry, int err)
670 {
671 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
672 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
673
674 /* .snap dir? */
675 if (err == -ENOENT &&
676 ceph_snap(parent) == CEPH_NOSNAP &&
677 strcmp(dentry->d_name.name,
678 fsc->mount_options->snapdir_name) == 0) {
679 struct inode *inode = ceph_get_snapdir(parent);
680 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
681 dentry, dentry, inode);
682 BUG_ON(!d_unhashed(dentry));
683 d_add(dentry, inode);
684 err = 0;
685 }
686 return err;
687 }
688
689 /*
690 * Figure out final result of a lookup/open request.
691 *
692 * Mainly, make sure we return the final req->r_dentry (if it already
693 * existed) in place of the original VFS-provided dentry when they
694 * differ.
695 *
696 * Gracefully handle the case where the MDS replies with -ENOENT and
697 * no trace (which it may do, at its discretion, e.g., if it doesn't
698 * care to issue a lease on the negative dentry).
699 */
700 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
701 struct dentry *dentry, int err)
702 {
703 if (err == -ENOENT) {
704 /* no trace? */
705 err = 0;
706 if (!req->r_reply_info.head->is_dentry) {
707 dout("ENOENT and no trace, dentry %p inode %p\n",
708 dentry, d_inode(dentry));
709 if (d_really_is_positive(dentry)) {
710 d_drop(dentry);
711 err = -ENOENT;
712 } else {
713 d_add(dentry, NULL);
714 }
715 }
716 }
717 if (err)
718 dentry = ERR_PTR(err);
719 else if (dentry != req->r_dentry)
720 dentry = dget(req->r_dentry); /* we got spliced */
721 else
722 dentry = NULL;
723 return dentry;
724 }
725
726 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
727 {
728 return ceph_ino(inode) == CEPH_INO_ROOT &&
729 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
730 }
731
732 /*
733 * Look up a single dir entry. If there is a lookup intent, inform
734 * the MDS so that it gets our 'caps wanted' value in a single op.
735 */
736 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
737 unsigned int flags)
738 {
739 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
740 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
741 struct ceph_mds_request *req;
742 int op;
743 int mask;
744 int err;
745
746 dout("lookup %p dentry %p '%pd'\n",
747 dir, dentry, dentry);
748
749 if (dentry->d_name.len > NAME_MAX)
750 return ERR_PTR(-ENAMETOOLONG);
751
752 /* can we conclude ENOENT locally? */
753 if (d_really_is_negative(dentry)) {
754 struct ceph_inode_info *ci = ceph_inode(dir);
755 struct ceph_dentry_info *di = ceph_dentry(dentry);
756
757 spin_lock(&ci->i_ceph_lock);
758 dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
759 if (strncmp(dentry->d_name.name,
760 fsc->mount_options->snapdir_name,
761 dentry->d_name.len) &&
762 !is_root_ceph_dentry(dir, dentry) &&
763 ceph_test_mount_opt(fsc, DCACHE) &&
764 __ceph_dir_is_complete(ci) &&
765 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
766 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
767 spin_unlock(&ci->i_ceph_lock);
768 dout(" dir %p complete, -ENOENT\n", dir);
769 d_add(dentry, NULL);
770 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
771 return NULL;
772 }
773 spin_unlock(&ci->i_ceph_lock);
774 }
775
776 op = ceph_snap(dir) == CEPH_SNAPDIR ?
777 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
778 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
779 if (IS_ERR(req))
780 return ERR_CAST(req);
781 req->r_dentry = dget(dentry);
782 req->r_num_caps = 2;
783
784 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
785 if (ceph_security_xattr_wanted(dir))
786 mask |= CEPH_CAP_XATTR_SHARED;
787 req->r_args.getattr.mask = cpu_to_le32(mask);
788
789 req->r_parent = dir;
790 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
791 err = ceph_mdsc_do_request(mdsc, NULL, req);
792 err = ceph_handle_snapdir(req, dentry, err);
793 dentry = ceph_finish_lookup(req, dentry, err);
794 ceph_mdsc_put_request(req); /* will dput(dentry) */
795 dout("lookup result=%p\n", dentry);
796 return dentry;
797 }
798
799 /*
800 * If we do a create but get no trace back from the MDS, follow up with
801 * a lookup (the VFS expects us to link up the provided dentry).
802 */
803 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
804 {
805 struct dentry *result = ceph_lookup(dir, dentry, 0);
806
807 if (result && !IS_ERR(result)) {
808 /*
809 * We created the item, then did a lookup, and found
810 * it was already linked to another inode we already
811 * had in our cache (and thus got spliced). To not
812 * confuse VFS (especially when inode is a directory),
813 * we don't link our dentry to that inode, return an
814 * error instead.
815 *
816 * This event should be rare and it happens only when
817 * we talk to old MDS. Recent MDS does not send traceless
818 * reply for request that creates new inode.
819 */
820 d_drop(result);
821 return -ESTALE;
822 }
823 return PTR_ERR(result);
824 }
825
826 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
827 umode_t mode, dev_t rdev)
828 {
829 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
830 struct ceph_mds_request *req;
831 struct ceph_acl_sec_ctx as_ctx = {};
832 int err;
833
834 if (ceph_snap(dir) != CEPH_NOSNAP)
835 return -EROFS;
836
837 if (ceph_quota_is_max_files_exceeded(dir)) {
838 err = -EDQUOT;
839 goto out;
840 }
841
842 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
843 if (err < 0)
844 goto out;
845 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
846 if (err < 0)
847 goto out;
848
849 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
850 dir, dentry, mode, rdev);
851 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
852 if (IS_ERR(req)) {
853 err = PTR_ERR(req);
854 goto out;
855 }
856 req->r_dentry = dget(dentry);
857 req->r_num_caps = 2;
858 req->r_parent = dir;
859 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
860 req->r_args.mknod.mode = cpu_to_le32(mode);
861 req->r_args.mknod.rdev = cpu_to_le32(rdev);
862 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
863 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
864 if (as_ctx.pagelist) {
865 req->r_pagelist = as_ctx.pagelist;
866 as_ctx.pagelist = NULL;
867 }
868 err = ceph_mdsc_do_request(mdsc, dir, req);
869 if (!err && !req->r_reply_info.head->is_dentry)
870 err = ceph_handle_notrace_create(dir, dentry);
871 ceph_mdsc_put_request(req);
872 out:
873 if (!err)
874 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
875 else
876 d_drop(dentry);
877 ceph_release_acl_sec_ctx(&as_ctx);
878 return err;
879 }
880
881 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
882 bool excl)
883 {
884 return ceph_mknod(dir, dentry, mode, 0);
885 }
886
887 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
888 const char *dest)
889 {
890 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
891 struct ceph_mds_request *req;
892 struct ceph_acl_sec_ctx as_ctx = {};
893 int err;
894
895 if (ceph_snap(dir) != CEPH_NOSNAP)
896 return -EROFS;
897
898 if (ceph_quota_is_max_files_exceeded(dir)) {
899 err = -EDQUOT;
900 goto out;
901 }
902
903 err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
904 if (err < 0)
905 goto out;
906
907 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
908 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
909 if (IS_ERR(req)) {
910 err = PTR_ERR(req);
911 goto out;
912 }
913 req->r_path2 = kstrdup(dest, GFP_KERNEL);
914 if (!req->r_path2) {
915 err = -ENOMEM;
916 ceph_mdsc_put_request(req);
917 goto out;
918 }
919 req->r_parent = dir;
920 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
921 req->r_dentry = dget(dentry);
922 req->r_num_caps = 2;
923 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
924 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
925 if (as_ctx.pagelist) {
926 req->r_pagelist = as_ctx.pagelist;
927 as_ctx.pagelist = NULL;
928 }
929 err = ceph_mdsc_do_request(mdsc, dir, req);
930 if (!err && !req->r_reply_info.head->is_dentry)
931 err = ceph_handle_notrace_create(dir, dentry);
932 ceph_mdsc_put_request(req);
933 out:
934 if (err)
935 d_drop(dentry);
936 ceph_release_acl_sec_ctx(&as_ctx);
937 return err;
938 }
939
940 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
941 {
942 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
943 struct ceph_mds_request *req;
944 struct ceph_acl_sec_ctx as_ctx = {};
945 int err = -EROFS;
946 int op;
947
948 if (ceph_snap(dir) == CEPH_SNAPDIR) {
949 /* mkdir .snap/foo is a MKSNAP */
950 op = CEPH_MDS_OP_MKSNAP;
951 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
952 dentry, dentry);
953 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
954 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
955 op = CEPH_MDS_OP_MKDIR;
956 } else {
957 goto out;
958 }
959
960 if (op == CEPH_MDS_OP_MKDIR &&
961 ceph_quota_is_max_files_exceeded(dir)) {
962 err = -EDQUOT;
963 goto out;
964 }
965
966 mode |= S_IFDIR;
967 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
968 if (err < 0)
969 goto out;
970 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
971 if (err < 0)
972 goto out;
973
974 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
975 if (IS_ERR(req)) {
976 err = PTR_ERR(req);
977 goto out;
978 }
979
980 req->r_dentry = dget(dentry);
981 req->r_num_caps = 2;
982 req->r_parent = dir;
983 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
984 req->r_args.mkdir.mode = cpu_to_le32(mode);
985 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
986 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
987 if (as_ctx.pagelist) {
988 req->r_pagelist = as_ctx.pagelist;
989 as_ctx.pagelist = NULL;
990 }
991 err = ceph_mdsc_do_request(mdsc, dir, req);
992 if (!err &&
993 !req->r_reply_info.head->is_target &&
994 !req->r_reply_info.head->is_dentry)
995 err = ceph_handle_notrace_create(dir, dentry);
996 ceph_mdsc_put_request(req);
997 out:
998 if (!err)
999 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
1000 else
1001 d_drop(dentry);
1002 ceph_release_acl_sec_ctx(&as_ctx);
1003 return err;
1004 }
1005
1006 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
1007 struct dentry *dentry)
1008 {
1009 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
1010 struct ceph_mds_request *req;
1011 int err;
1012
1013 if (ceph_snap(dir) != CEPH_NOSNAP)
1014 return -EROFS;
1015
1016 dout("link in dir %p old_dentry %p dentry %p\n", dir,
1017 old_dentry, dentry);
1018 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1019 if (IS_ERR(req)) {
1020 d_drop(dentry);
1021 return PTR_ERR(req);
1022 }
1023 req->r_dentry = dget(dentry);
1024 req->r_num_caps = 2;
1025 req->r_old_dentry = dget(old_dentry);
1026 req->r_parent = dir;
1027 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1028 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1029 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1030 /* release LINK_SHARED on source inode (mds will lock it) */
1031 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1032 err = ceph_mdsc_do_request(mdsc, dir, req);
1033 if (err) {
1034 d_drop(dentry);
1035 } else if (!req->r_reply_info.head->is_dentry) {
1036 ihold(d_inode(old_dentry));
1037 d_instantiate(dentry, d_inode(old_dentry));
1038 }
1039 ceph_mdsc_put_request(req);
1040 return err;
1041 }
1042
1043 static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
1044 struct ceph_mds_request *req)
1045 {
1046 int result = req->r_err ? req->r_err :
1047 le32_to_cpu(req->r_reply_info.head->result);
1048
1049 if (result == -EJUKEBOX)
1050 goto out;
1051
1052 /* If op failed, mark everyone involved for errors */
1053 if (result) {
1054 int pathlen = 0;
1055 u64 base = 0;
1056 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
1057 &base, 0);
1058
1059 /* mark error on parent + clear complete */
1060 mapping_set_error(req->r_parent->i_mapping, result);
1061 ceph_dir_clear_complete(req->r_parent);
1062
1063 /* drop the dentry -- we don't know its status */
1064 if (!d_unhashed(req->r_dentry))
1065 d_drop(req->r_dentry);
1066
1067 /* mark inode itself for an error (since metadata is bogus) */
1068 mapping_set_error(req->r_old_inode->i_mapping, result);
1069
1070 pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n",
1071 base, IS_ERR(path) ? "<<bad>>" : path, result);
1072 ceph_mdsc_free_path(path, pathlen);
1073 }
1074 out:
1075 iput(req->r_old_inode);
1076 ceph_mdsc_release_dir_caps(req);
1077 }
1078
1079 static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
1080 {
1081 struct ceph_inode_info *ci = ceph_inode(dir);
1082 struct ceph_dentry_info *di;
1083 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
1084
1085 spin_lock(&ci->i_ceph_lock);
1086 if ((__ceph_caps_issued(ci, NULL) & want) == want) {
1087 ceph_take_cap_refs(ci, want, false);
1088 got = want;
1089 }
1090 spin_unlock(&ci->i_ceph_lock);
1091
1092 /* If we didn't get anything, return 0 */
1093 if (!got)
1094 return 0;
1095
1096 spin_lock(&dentry->d_lock);
1097 di = ceph_dentry(dentry);
1098 /*
1099 * - We are holding Fx, which implies Fs caps.
1100 * - Only support async unlink for primary linkage
1101 */
1102 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
1103 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
1104 want = 0;
1105 spin_unlock(&dentry->d_lock);
1106
1107 /* Do we still want what we've got? */
1108 if (want == got)
1109 return got;
1110
1111 ceph_put_cap_refs(ci, got);
1112 return 0;
1113 }
1114
1115 /*
1116 * rmdir and unlink are differ only by the metadata op code
1117 */
1118 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1119 {
1120 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1121 struct ceph_mds_client *mdsc = fsc->mdsc;
1122 struct inode *inode = d_inode(dentry);
1123 struct ceph_mds_request *req;
1124 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
1125 int err = -EROFS;
1126 int op;
1127
1128 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1129 /* rmdir .snap/foo is RMSNAP */
1130 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1131 op = CEPH_MDS_OP_RMSNAP;
1132 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1133 dout("unlink/rmdir dir %p dn %p inode %p\n",
1134 dir, dentry, inode);
1135 op = d_is_dir(dentry) ?
1136 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1137 } else
1138 goto out;
1139 retry:
1140 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1141 if (IS_ERR(req)) {
1142 err = PTR_ERR(req);
1143 goto out;
1144 }
1145 req->r_dentry = dget(dentry);
1146 req->r_num_caps = 2;
1147 req->r_parent = dir;
1148 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1149 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1150 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1151
1152 if (try_async && op == CEPH_MDS_OP_UNLINK &&
1153 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
1154 dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir),
1155 dentry->d_name.len, dentry->d_name.name,
1156 ceph_cap_string(req->r_dir_caps));
1157 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
1158 req->r_callback = ceph_async_unlink_cb;
1159 req->r_old_inode = d_inode(dentry);
1160 ihold(req->r_old_inode);
1161 err = ceph_mdsc_submit_request(mdsc, dir, req);
1162 if (!err) {
1163 /*
1164 * We have enough caps, so we assume that the unlink
1165 * will succeed. Fix up the target inode and dcache.
1166 */
1167 drop_nlink(inode);
1168 d_delete(dentry);
1169 } else if (err == -EJUKEBOX) {
1170 try_async = false;
1171 ceph_mdsc_put_request(req);
1172 goto retry;
1173 }
1174 } else {
1175 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1176 err = ceph_mdsc_do_request(mdsc, dir, req);
1177 if (!err && !req->r_reply_info.head->is_dentry)
1178 d_delete(dentry);
1179 }
1180
1181 ceph_mdsc_put_request(req);
1182 out:
1183 return err;
1184 }
1185
1186 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1187 struct inode *new_dir, struct dentry *new_dentry,
1188 unsigned int flags)
1189 {
1190 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);
1191 struct ceph_mds_request *req;
1192 int op = CEPH_MDS_OP_RENAME;
1193 int err;
1194
1195 if (flags)
1196 return -EINVAL;
1197
1198 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1199 return -EXDEV;
1200 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1201 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1202 op = CEPH_MDS_OP_RENAMESNAP;
1203 else
1204 return -EROFS;
1205 }
1206 /* don't allow cross-quota renames */
1207 if ((old_dir != new_dir) &&
1208 (!ceph_quota_is_same_realm(old_dir, new_dir)))
1209 return -EXDEV;
1210
1211 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1212 old_dir, old_dentry, new_dir, new_dentry);
1213 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1214 if (IS_ERR(req))
1215 return PTR_ERR(req);
1216 ihold(old_dir);
1217 req->r_dentry = dget(new_dentry);
1218 req->r_num_caps = 2;
1219 req->r_old_dentry = dget(old_dentry);
1220 req->r_old_dentry_dir = old_dir;
1221 req->r_parent = new_dir;
1222 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1223 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1224 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1225 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1226 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1227 /* release LINK_RDCACHE on source inode (mds will lock it) */
1228 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1229 if (d_really_is_positive(new_dentry)) {
1230 req->r_inode_drop =
1231 ceph_drop_caps_for_unlink(d_inode(new_dentry));
1232 }
1233 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1234 if (!err && !req->r_reply_info.head->is_dentry) {
1235 /*
1236 * Normally d_move() is done by fill_trace (called by
1237 * do_request, above). If there is no trace, we need
1238 * to do it here.
1239 */
1240 d_move(old_dentry, new_dentry);
1241 }
1242 ceph_mdsc_put_request(req);
1243 return err;
1244 }
1245
1246 /*
1247 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1248 * Leases at front of the list will expire first. (Assume all leases have
1249 * similar duration)
1250 *
1251 * Called under dentry->d_lock.
1252 */
1253 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1254 {
1255 struct dentry *dn = di->dentry;
1256 struct ceph_mds_client *mdsc;
1257
1258 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1259
1260 di->flags |= CEPH_DENTRY_LEASE_LIST;
1261 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1262 di->flags |= CEPH_DENTRY_REFERENCED;
1263 return;
1264 }
1265
1266 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1267 spin_lock(&mdsc->dentry_list_lock);
1268 list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1269 spin_unlock(&mdsc->dentry_list_lock);
1270 }
1271
1272 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1273 struct ceph_dentry_info *di)
1274 {
1275 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1276 di->lease_gen = 0;
1277 di->time = jiffies;
1278 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1279 }
1280
1281 /*
1282 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1283 * list if it's not in the list, otherwise set 'referenced' flag.
1284 *
1285 * Called under dentry->d_lock.
1286 */
1287 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1288 {
1289 struct dentry *dn = di->dentry;
1290 struct ceph_mds_client *mdsc;
1291
1292 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
1293 di, dn, dn, di->offset);
1294
1295 if (!list_empty(&di->lease_list)) {
1296 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1297 /* don't remove dentry from dentry lease list
1298 * if its lease is valid */
1299 if (__dentry_lease_is_valid(di))
1300 return;
1301 } else {
1302 di->flags |= CEPH_DENTRY_REFERENCED;
1303 return;
1304 }
1305 }
1306
1307 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1308 di->flags |= CEPH_DENTRY_REFERENCED;
1309 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1310 return;
1311 }
1312
1313 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1314 spin_lock(&mdsc->dentry_list_lock);
1315 __dentry_dir_lease_touch(mdsc, di),
1316 spin_unlock(&mdsc->dentry_list_lock);
1317 }
1318
1319 static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1320 {
1321 struct ceph_mds_client *mdsc;
1322 if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1323 return;
1324 if (list_empty(&di->lease_list))
1325 return;
1326
1327 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1328 spin_lock(&mdsc->dentry_list_lock);
1329 list_del_init(&di->lease_list);
1330 spin_unlock(&mdsc->dentry_list_lock);
1331 }
1332
1333 enum {
1334 KEEP = 0,
1335 DELETE = 1,
1336 TOUCH = 2,
1337 STOP = 4,
1338 };
1339
1340 struct ceph_lease_walk_control {
1341 bool dir_lease;
1342 bool expire_dir_lease;
1343 unsigned long nr_to_scan;
1344 unsigned long dir_lease_ttl;
1345 };
1346
1347 static unsigned long
1348 __dentry_leases_walk(struct ceph_mds_client *mdsc,
1349 struct ceph_lease_walk_control *lwc,
1350 int (*check)(struct dentry*, void*))
1351 {
1352 struct ceph_dentry_info *di, *tmp;
1353 struct dentry *dentry, *last = NULL;
1354 struct list_head* list;
1355 LIST_HEAD(dispose);
1356 unsigned long freed = 0;
1357 int ret = 0;
1358
1359 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1360 spin_lock(&mdsc->dentry_list_lock);
1361 list_for_each_entry_safe(di, tmp, list, lease_list) {
1362 if (!lwc->nr_to_scan)
1363 break;
1364 --lwc->nr_to_scan;
1365
1366 dentry = di->dentry;
1367 if (last == dentry)
1368 break;
1369
1370 if (!spin_trylock(&dentry->d_lock))
1371 continue;
1372
1373 if (__lockref_is_dead(&dentry->d_lockref)) {
1374 list_del_init(&di->lease_list);
1375 goto next;
1376 }
1377
1378 ret = check(dentry, lwc);
1379 if (ret & TOUCH) {
1380 /* move it into tail of dir lease list */
1381 __dentry_dir_lease_touch(mdsc, di);
1382 if (!last)
1383 last = dentry;
1384 }
1385 if (ret & DELETE) {
1386 /* stale lease */
1387 di->flags &= ~CEPH_DENTRY_REFERENCED;
1388 if (dentry->d_lockref.count > 0) {
1389 /* update_dentry_lease() will re-add
1390 * it to lease list, or
1391 * ceph_d_delete() will return 1 when
1392 * last reference is dropped */
1393 list_del_init(&di->lease_list);
1394 } else {
1395 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1396 list_move_tail(&di->lease_list, &dispose);
1397 dget_dlock(dentry);
1398 }
1399 }
1400 next:
1401 spin_unlock(&dentry->d_lock);
1402 if (ret & STOP)
1403 break;
1404 }
1405 spin_unlock(&mdsc->dentry_list_lock);
1406
1407 while (!list_empty(&dispose)) {
1408 di = list_first_entry(&dispose, struct ceph_dentry_info,
1409 lease_list);
1410 dentry = di->dentry;
1411 spin_lock(&dentry->d_lock);
1412
1413 list_del_init(&di->lease_list);
1414 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1415 if (di->flags & CEPH_DENTRY_REFERENCED) {
1416 spin_lock(&mdsc->dentry_list_lock);
1417 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1418 list_add_tail(&di->lease_list,
1419 &mdsc->dentry_leases);
1420 } else {
1421 __dentry_dir_lease_touch(mdsc, di);
1422 }
1423 spin_unlock(&mdsc->dentry_list_lock);
1424 } else {
1425 freed++;
1426 }
1427
1428 spin_unlock(&dentry->d_lock);
1429 /* ceph_d_delete() does the trick */
1430 dput(dentry);
1431 }
1432 return freed;
1433 }
1434
1435 static int __dentry_lease_check(struct dentry *dentry, void *arg)
1436 {
1437 struct ceph_dentry_info *di = ceph_dentry(dentry);
1438 int ret;
1439
1440 if (__dentry_lease_is_valid(di))
1441 return STOP;
1442 ret = __dir_lease_try_check(dentry);
1443 if (ret == -EBUSY)
1444 return KEEP;
1445 if (ret > 0)
1446 return TOUCH;
1447 return DELETE;
1448 }
1449
1450 static int __dir_lease_check(struct dentry *dentry, void *arg)
1451 {
1452 struct ceph_lease_walk_control *lwc = arg;
1453 struct ceph_dentry_info *di = ceph_dentry(dentry);
1454
1455 int ret = __dir_lease_try_check(dentry);
1456 if (ret == -EBUSY)
1457 return KEEP;
1458 if (ret > 0) {
1459 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1460 return STOP;
1461 /* Move dentry to tail of dir lease list if we don't want
1462 * to delete it. So dentries in the list are checked in a
1463 * round robin manner */
1464 if (!lwc->expire_dir_lease)
1465 return TOUCH;
1466 if (dentry->d_lockref.count > 0 ||
1467 (di->flags & CEPH_DENTRY_REFERENCED))
1468 return TOUCH;
1469 /* invalidate dir lease */
1470 di->lease_shared_gen = 0;
1471 }
1472 return DELETE;
1473 }
1474
1475 int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1476 {
1477 struct ceph_lease_walk_control lwc;
1478 unsigned long count;
1479 unsigned long freed;
1480
1481 spin_lock(&mdsc->caps_list_lock);
1482 if (mdsc->caps_use_max > 0 &&
1483 mdsc->caps_use_count > mdsc->caps_use_max)
1484 count = mdsc->caps_use_count - mdsc->caps_use_max;
1485 else
1486 count = 0;
1487 spin_unlock(&mdsc->caps_list_lock);
1488
1489 lwc.dir_lease = false;
1490 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
1491 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1492 if (!lwc.nr_to_scan) /* more invalid leases */
1493 return -EAGAIN;
1494
1495 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1496 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1497
1498 lwc.dir_lease = true;
1499 lwc.expire_dir_lease = freed < count;
1500 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1501 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1502 if (!lwc.nr_to_scan) /* more to check */
1503 return -EAGAIN;
1504
1505 return freed > 0 ? 1 : 0;
1506 }
1507
1508 /*
1509 * Ensure a dentry lease will no longer revalidate.
1510 */
1511 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1512 {
1513 struct ceph_dentry_info *di = ceph_dentry(dentry);
1514 spin_lock(&dentry->d_lock);
1515 di->time = jiffies;
1516 di->lease_shared_gen = 0;
1517 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1518 __dentry_lease_unlist(di);
1519 spin_unlock(&dentry->d_lock);
1520 }
1521
1522 /*
1523 * Check if dentry lease is valid. If not, delete the lease. Try to
1524 * renew if the least is more than half up.
1525 */
1526 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1527 {
1528 struct ceph_mds_session *session;
1529
1530 if (!di->lease_gen)
1531 return false;
1532
1533 session = di->lease_session;
1534 if (session) {
1535 u32 gen;
1536 unsigned long ttl;
1537
1538 spin_lock(&session->s_gen_ttl_lock);
1539 gen = session->s_cap_gen;
1540 ttl = session->s_cap_ttl;
1541 spin_unlock(&session->s_gen_ttl_lock);
1542
1543 if (di->lease_gen == gen &&
1544 time_before(jiffies, ttl) &&
1545 time_before(jiffies, di->time))
1546 return true;
1547 }
1548 di->lease_gen = 0;
1549 return false;
1550 }
1551
1552 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
1553 {
1554 struct ceph_dentry_info *di;
1555 struct ceph_mds_session *session = NULL;
1556 u32 seq = 0;
1557 int valid = 0;
1558
1559 spin_lock(&dentry->d_lock);
1560 di = ceph_dentry(dentry);
1561 if (di && __dentry_lease_is_valid(di)) {
1562 valid = 1;
1563
1564 if (di->lease_renew_after &&
1565 time_after(jiffies, di->lease_renew_after)) {
1566 /*
1567 * We should renew. If we're in RCU walk mode
1568 * though, we can't do that so just return
1569 * -ECHILD.
1570 */
1571 if (flags & LOOKUP_RCU) {
1572 valid = -ECHILD;
1573 } else {
1574 session = ceph_get_mds_session(di->lease_session);
1575 seq = di->lease_seq;
1576 di->lease_renew_after = 0;
1577 di->lease_renew_from = jiffies;
1578 }
1579 }
1580 }
1581 spin_unlock(&dentry->d_lock);
1582
1583 if (session) {
1584 ceph_mdsc_lease_send_msg(session, dentry,
1585 CEPH_MDS_LEASE_RENEW, seq);
1586 ceph_put_mds_session(session);
1587 }
1588 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1589 return valid;
1590 }
1591
1592 /*
1593 * Called under dentry->d_lock.
1594 */
1595 static int __dir_lease_try_check(const struct dentry *dentry)
1596 {
1597 struct ceph_dentry_info *di = ceph_dentry(dentry);
1598 struct inode *dir;
1599 struct ceph_inode_info *ci;
1600 int valid = 0;
1601
1602 if (!di->lease_shared_gen)
1603 return 0;
1604 if (IS_ROOT(dentry))
1605 return 0;
1606
1607 dir = d_inode(dentry->d_parent);
1608 ci = ceph_inode(dir);
1609
1610 if (spin_trylock(&ci->i_ceph_lock)) {
1611 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1612 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1613 valid = 1;
1614 spin_unlock(&ci->i_ceph_lock);
1615 } else {
1616 valid = -EBUSY;
1617 }
1618
1619 if (!valid)
1620 di->lease_shared_gen = 0;
1621 return valid;
1622 }
1623
1624 /*
1625 * Check if directory-wide content lease/cap is valid.
1626 */
1627 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
1628 struct ceph_mds_client *mdsc)
1629 {
1630 struct ceph_inode_info *ci = ceph_inode(dir);
1631 int valid;
1632 int shared_gen;
1633
1634 spin_lock(&ci->i_ceph_lock);
1635 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1636 if (valid) {
1637 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
1638 shared_gen = atomic_read(&ci->i_shared_gen);
1639 }
1640 spin_unlock(&ci->i_ceph_lock);
1641 if (valid) {
1642 struct ceph_dentry_info *di;
1643 spin_lock(&dentry->d_lock);
1644 di = ceph_dentry(dentry);
1645 if (dir == d_inode(dentry->d_parent) &&
1646 di && di->lease_shared_gen == shared_gen)
1647 __ceph_dentry_dir_lease_touch(di);
1648 else
1649 valid = 0;
1650 spin_unlock(&dentry->d_lock);
1651 }
1652 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
1653 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
1654 return valid;
1655 }
1656
1657 /*
1658 * Check if cached dentry can be trusted.
1659 */
1660 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1661 {
1662 int valid = 0;
1663 struct dentry *parent;
1664 struct inode *dir, *inode;
1665 struct ceph_mds_client *mdsc;
1666
1667 if (flags & LOOKUP_RCU) {
1668 parent = READ_ONCE(dentry->d_parent);
1669 dir = d_inode_rcu(parent);
1670 if (!dir)
1671 return -ECHILD;
1672 inode = d_inode_rcu(dentry);
1673 } else {
1674 parent = dget_parent(dentry);
1675 dir = d_inode(parent);
1676 inode = d_inode(dentry);
1677 }
1678
1679 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
1680 dentry, inode, ceph_dentry(dentry)->offset);
1681
1682 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
1683
1684 /* always trust cached snapped dentries, snapdir dentry */
1685 if (ceph_snap(dir) != CEPH_NOSNAP) {
1686 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1687 dentry, inode);
1688 valid = 1;
1689 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1690 valid = 1;
1691 } else {
1692 valid = dentry_lease_is_valid(dentry, flags);
1693 if (valid == -ECHILD)
1694 return valid;
1695 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
1696 if (inode)
1697 valid = ceph_is_any_caps(inode);
1698 else
1699 valid = 1;
1700 }
1701 }
1702
1703 if (!valid) {
1704 struct ceph_mds_request *req;
1705 int op, err;
1706 u32 mask;
1707
1708 if (flags & LOOKUP_RCU)
1709 return -ECHILD;
1710
1711 percpu_counter_inc(&mdsc->metric.d_lease_mis);
1712
1713 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1714 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1715 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1716 if (!IS_ERR(req)) {
1717 req->r_dentry = dget(dentry);
1718 req->r_num_caps = 2;
1719 req->r_parent = dir;
1720
1721 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1722 if (ceph_security_xattr_wanted(dir))
1723 mask |= CEPH_CAP_XATTR_SHARED;
1724 req->r_args.getattr.mask = cpu_to_le32(mask);
1725
1726 err = ceph_mdsc_do_request(mdsc, NULL, req);
1727 switch (err) {
1728 case 0:
1729 if (d_really_is_positive(dentry) &&
1730 d_inode(dentry) == req->r_target_inode)
1731 valid = 1;
1732 break;
1733 case -ENOENT:
1734 if (d_really_is_negative(dentry))
1735 valid = 1;
1736 fallthrough;
1737 default:
1738 break;
1739 }
1740 ceph_mdsc_put_request(req);
1741 dout("d_revalidate %p lookup result=%d\n",
1742 dentry, err);
1743 }
1744 } else {
1745 percpu_counter_inc(&mdsc->metric.d_lease_hit);
1746 }
1747
1748 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1749 if (!valid)
1750 ceph_dir_clear_complete(dir);
1751
1752 if (!(flags & LOOKUP_RCU))
1753 dput(parent);
1754 return valid;
1755 }
1756
1757 /*
1758 * Delete unused dentry that doesn't have valid lease
1759 *
1760 * Called under dentry->d_lock.
1761 */
1762 static int ceph_d_delete(const struct dentry *dentry)
1763 {
1764 struct ceph_dentry_info *di;
1765
1766 /* won't release caps */
1767 if (d_really_is_negative(dentry))
1768 return 0;
1769 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1770 return 0;
1771 /* vaild lease? */
1772 di = ceph_dentry(dentry);
1773 if (di) {
1774 if (__dentry_lease_is_valid(di))
1775 return 0;
1776 if (__dir_lease_try_check(dentry))
1777 return 0;
1778 }
1779 return 1;
1780 }
1781
1782 /*
1783 * Release our ceph_dentry_info.
1784 */
1785 static void ceph_d_release(struct dentry *dentry)
1786 {
1787 struct ceph_dentry_info *di = ceph_dentry(dentry);
1788 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1789
1790 dout("d_release %p\n", dentry);
1791
1792 atomic64_dec(&fsc->mdsc->metric.total_dentries);
1793
1794 spin_lock(&dentry->d_lock);
1795 __dentry_lease_unlist(di);
1796 dentry->d_fsdata = NULL;
1797 spin_unlock(&dentry->d_lock);
1798
1799 if (di->lease_session)
1800 ceph_put_mds_session(di->lease_session);
1801 kmem_cache_free(ceph_dentry_cachep, di);
1802 }
1803
1804 /*
1805 * When the VFS prunes a dentry from the cache, we need to clear the
1806 * complete flag on the parent directory.
1807 *
1808 * Called under dentry->d_lock.
1809 */
1810 static void ceph_d_prune(struct dentry *dentry)
1811 {
1812 struct ceph_inode_info *dir_ci;
1813 struct ceph_dentry_info *di;
1814
1815 dout("ceph_d_prune %pd %p\n", dentry, dentry);
1816
1817 /* do we have a valid parent? */
1818 if (IS_ROOT(dentry))
1819 return;
1820
1821 /* we hold d_lock, so d_parent is stable */
1822 dir_ci = ceph_inode(d_inode(dentry->d_parent));
1823 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1824 return;
1825
1826 /* who calls d_delete() should also disable dcache readdir */
1827 if (d_really_is_negative(dentry))
1828 return;
1829
1830 /* d_fsdata does not get cleared until d_release */
1831 if (!d_unhashed(dentry)) {
1832 __ceph_dir_clear_complete(dir_ci);
1833 return;
1834 }
1835
1836 /* Disable dcache readdir just in case that someone called d_drop()
1837 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1838 * properly (dcache readdir is still enabled) */
1839 di = ceph_dentry(dentry);
1840 if (di->offset > 0 &&
1841 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1842 __ceph_dir_clear_ordered(dir_ci);
1843 }
1844
1845 /*
1846 * read() on a dir. This weird interface hack only works if mounted
1847 * with '-o dirstat'.
1848 */
1849 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1850 loff_t *ppos)
1851 {
1852 struct ceph_dir_file_info *dfi = file->private_data;
1853 struct inode *inode = file_inode(file);
1854 struct ceph_inode_info *ci = ceph_inode(inode);
1855 int left;
1856 const int bufsize = 1024;
1857
1858 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1859 return -EISDIR;
1860
1861 if (!dfi->dir_info) {
1862 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1863 if (!dfi->dir_info)
1864 return -ENOMEM;
1865 dfi->dir_info_len =
1866 snprintf(dfi->dir_info, bufsize,
1867 "entries: %20lld\n"
1868 " files: %20lld\n"
1869 " subdirs: %20lld\n"
1870 "rentries: %20lld\n"
1871 " rfiles: %20lld\n"
1872 " rsubdirs: %20lld\n"
1873 "rbytes: %20lld\n"
1874 "rctime: %10lld.%09ld\n",
1875 ci->i_files + ci->i_subdirs,
1876 ci->i_files,
1877 ci->i_subdirs,
1878 ci->i_rfiles + ci->i_rsubdirs,
1879 ci->i_rfiles,
1880 ci->i_rsubdirs,
1881 ci->i_rbytes,
1882 ci->i_rctime.tv_sec,
1883 ci->i_rctime.tv_nsec);
1884 }
1885
1886 if (*ppos >= dfi->dir_info_len)
1887 return 0;
1888 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1889 left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1890 if (left == size)
1891 return -EFAULT;
1892 *ppos += (size - left);
1893 return size - left;
1894 }
1895
1896
1897
1898 /*
1899 * Return name hash for a given dentry. This is dependent on
1900 * the parent directory's hash function.
1901 */
1902 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1903 {
1904 struct ceph_inode_info *dci = ceph_inode(dir);
1905 unsigned hash;
1906
1907 switch (dci->i_dir_layout.dl_dir_hash) {
1908 case 0: /* for backward compat */
1909 case CEPH_STR_HASH_LINUX:
1910 return dn->d_name.hash;
1911
1912 default:
1913 spin_lock(&dn->d_lock);
1914 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1915 dn->d_name.name, dn->d_name.len);
1916 spin_unlock(&dn->d_lock);
1917 return hash;
1918 }
1919 }
1920
1921 const struct file_operations ceph_dir_fops = {
1922 .read = ceph_read_dir,
1923 .iterate = ceph_readdir,
1924 .llseek = ceph_dir_llseek,
1925 .open = ceph_open,
1926 .release = ceph_release,
1927 .unlocked_ioctl = ceph_ioctl,
1928 .compat_ioctl = compat_ptr_ioctl,
1929 .fsync = ceph_fsync,
1930 .lock = ceph_lock,
1931 .flock = ceph_flock,
1932 };
1933
1934 const struct file_operations ceph_snapdir_fops = {
1935 .iterate = ceph_readdir,
1936 .llseek = ceph_dir_llseek,
1937 .open = ceph_open,
1938 .release = ceph_release,
1939 };
1940
1941 const struct inode_operations ceph_dir_iops = {
1942 .lookup = ceph_lookup,
1943 .permission = ceph_permission,
1944 .getattr = ceph_getattr,
1945 .setattr = ceph_setattr,
1946 .listxattr = ceph_listxattr,
1947 .get_acl = ceph_get_acl,
1948 .set_acl = ceph_set_acl,
1949 .mknod = ceph_mknod,
1950 .symlink = ceph_symlink,
1951 .mkdir = ceph_mkdir,
1952 .link = ceph_link,
1953 .unlink = ceph_unlink,
1954 .rmdir = ceph_unlink,
1955 .rename = ceph_rename,
1956 .create = ceph_create,
1957 .atomic_open = ceph_atomic_open,
1958 };
1959
1960 const struct inode_operations ceph_snapdir_iops = {
1961 .lookup = ceph_lookup,
1962 .permission = ceph_permission,
1963 .getattr = ceph_getattr,
1964 .mkdir = ceph_mkdir,
1965 .rmdir = ceph_unlink,
1966 .rename = ceph_rename,
1967 };
1968
1969 const struct dentry_operations ceph_dentry_ops = {
1970 .d_revalidate = ceph_d_revalidate,
1971 .d_delete = ceph_d_delete,
1972 .d_release = ceph_d_release,
1973 .d_prune = ceph_d_prune,
1974 .d_init = ceph_d_init,
1975 };
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