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ceph: define struct for dir entry in readdir reply
[deliverable/linux.git] / fs / ceph / dir.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
8
9 #include "super.h"
10 #include "mds_client.h"
11
12 /*
13 * Directory operations: readdir, lookup, create, link, unlink,
14 * rename, etc.
15 */
16
17 /*
18 * Ceph MDS operations are specified in terms of a base ino and
19 * relative path. Thus, the client can specify an operation on a
20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
21 * relative to, say, the root directory.
22 *
23 * Normally, we limit ourselves to strict inode ops (no path component)
24 * or dentry operations (a single path component relative to an ino). The
25 * exception to this is open_root_dentry(), which will open the mount
26 * point by name.
27 */
28
29 const struct dentry_operations ceph_dentry_ops;
30
31 /*
32 * Initialize ceph dentry state.
33 */
34 int ceph_init_dentry(struct dentry *dentry)
35 {
36 struct ceph_dentry_info *di;
37
38 if (dentry->d_fsdata)
39 return 0;
40
41 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
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 /*
72 * for readdir, we encode the directory frag and offset within that
73 * frag into f_pos.
74 */
75 static unsigned fpos_frag(loff_t p)
76 {
77 return p >> 32;
78 }
79 static unsigned fpos_off(loff_t p)
80 {
81 return p & 0xffffffff;
82 }
83
84 static int fpos_cmp(loff_t l, loff_t r)
85 {
86 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
87 if (v)
88 return v;
89 return (int)(fpos_off(l) - fpos_off(r));
90 }
91
92 /*
93 * make note of the last dentry we read, so we can
94 * continue at the same lexicographical point,
95 * regardless of what dir changes take place on the
96 * server.
97 */
98 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
99 int len, unsigned next_offset)
100 {
101 char *buf = kmalloc(len+1, GFP_KERNEL);
102 if (!buf)
103 return -ENOMEM;
104 kfree(fi->last_name);
105 fi->last_name = buf;
106 memcpy(fi->last_name, name, len);
107 fi->last_name[len] = 0;
108 fi->next_offset = next_offset;
109 dout("note_last_dentry '%s'\n", fi->last_name);
110 return 0;
111 }
112
113
114 static struct dentry *
115 __dcache_find_get_entry(struct dentry *parent, u64 idx,
116 struct ceph_readdir_cache_control *cache_ctl)
117 {
118 struct inode *dir = d_inode(parent);
119 struct dentry *dentry;
120 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
121 loff_t ptr_pos = idx * sizeof(struct dentry *);
122 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
123
124 if (ptr_pos >= i_size_read(dir))
125 return NULL;
126
127 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
128 ceph_readdir_cache_release(cache_ctl);
129 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
130 if (!cache_ctl->page) {
131 dout(" page %lu not found\n", ptr_pgoff);
132 return ERR_PTR(-EAGAIN);
133 }
134 /* reading/filling the cache are serialized by
135 i_mutex, no need to use page lock */
136 unlock_page(cache_ctl->page);
137 cache_ctl->dentries = kmap(cache_ctl->page);
138 }
139
140 cache_ctl->index = idx & idx_mask;
141
142 rcu_read_lock();
143 spin_lock(&parent->d_lock);
144 /* check i_size again here, because empty directory can be
145 * marked as complete while not holding the i_mutex. */
146 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
147 dentry = cache_ctl->dentries[cache_ctl->index];
148 else
149 dentry = NULL;
150 spin_unlock(&parent->d_lock);
151 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
152 dentry = NULL;
153 rcu_read_unlock();
154 return dentry ? : ERR_PTR(-EAGAIN);
155 }
156
157 /*
158 * When possible, we try to satisfy a readdir by peeking at the
159 * dcache. We make this work by carefully ordering dentries on
160 * d_child when we initially get results back from the MDS, and
161 * falling back to a "normal" sync readdir if any dentries in the dir
162 * are dropped.
163 *
164 * Complete dir indicates that we have all dentries in the dir. It is
165 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
166 * the MDS if/when the directory is modified).
167 */
168 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
169 u32 shared_gen)
170 {
171 struct ceph_file_info *fi = file->private_data;
172 struct dentry *parent = file->f_path.dentry;
173 struct inode *dir = d_inode(parent);
174 struct dentry *dentry, *last = NULL;
175 struct ceph_dentry_info *di;
176 struct ceph_readdir_cache_control cache_ctl = {};
177 u64 idx = 0;
178 int err = 0;
179
180 dout("__dcache_readdir %p v%u at %llu\n", dir, shared_gen, ctx->pos);
181
182 /* search start position */
183 if (ctx->pos > 2) {
184 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
185 while (count > 0) {
186 u64 step = count >> 1;
187 dentry = __dcache_find_get_entry(parent, idx + step,
188 &cache_ctl);
189 if (!dentry) {
190 /* use linar search */
191 idx = 0;
192 break;
193 }
194 if (IS_ERR(dentry)) {
195 err = PTR_ERR(dentry);
196 goto out;
197 }
198 di = ceph_dentry(dentry);
199 spin_lock(&dentry->d_lock);
200 if (fpos_cmp(di->offset, ctx->pos) < 0) {
201 idx += step + 1;
202 count -= step + 1;
203 } else {
204 count = step;
205 }
206 spin_unlock(&dentry->d_lock);
207 dput(dentry);
208 }
209
210 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
211 }
212
213
214 for (;;) {
215 bool emit_dentry = false;
216 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
217 if (!dentry) {
218 fi->flags |= CEPH_F_ATEND;
219 err = 0;
220 break;
221 }
222 if (IS_ERR(dentry)) {
223 err = PTR_ERR(dentry);
224 goto out;
225 }
226
227 di = ceph_dentry(dentry);
228 spin_lock(&dentry->d_lock);
229 if (di->lease_shared_gen == shared_gen &&
230 d_really_is_positive(dentry) &&
231 fpos_cmp(ctx->pos, di->offset) <= 0) {
232 emit_dentry = true;
233 }
234 spin_unlock(&dentry->d_lock);
235
236 if (emit_dentry) {
237 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
238 dentry, dentry, d_inode(dentry));
239 ctx->pos = di->offset;
240 if (!dir_emit(ctx, dentry->d_name.name,
241 dentry->d_name.len,
242 ceph_translate_ino(dentry->d_sb,
243 d_inode(dentry)->i_ino),
244 d_inode(dentry)->i_mode >> 12)) {
245 dput(dentry);
246 err = 0;
247 break;
248 }
249 ctx->pos++;
250
251 if (last)
252 dput(last);
253 last = dentry;
254 } else {
255 dput(dentry);
256 }
257 }
258 out:
259 ceph_readdir_cache_release(&cache_ctl);
260 if (last) {
261 int ret;
262 di = ceph_dentry(last);
263 ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
264 fpos_off(di->offset) + 1);
265 if (ret < 0)
266 err = ret;
267 dput(last);
268 }
269 return err;
270 }
271
272 static int ceph_readdir(struct file *file, struct dir_context *ctx)
273 {
274 struct ceph_file_info *fi = file->private_data;
275 struct inode *inode = file_inode(file);
276 struct ceph_inode_info *ci = ceph_inode(inode);
277 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
278 struct ceph_mds_client *mdsc = fsc->mdsc;
279 unsigned frag = fpos_frag(ctx->pos);
280 int off = fpos_off(ctx->pos);
281 int err;
282 u32 ftype;
283 struct ceph_mds_reply_info_parsed *rinfo;
284
285 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
286 if (fi->flags & CEPH_F_ATEND)
287 return 0;
288
289 /* always start with . and .. */
290 if (ctx->pos == 0) {
291 dout("readdir off 0 -> '.'\n");
292 if (!dir_emit(ctx, ".", 1,
293 ceph_translate_ino(inode->i_sb, inode->i_ino),
294 inode->i_mode >> 12))
295 return 0;
296 ctx->pos = 1;
297 off = 1;
298 }
299 if (ctx->pos == 1) {
300 ino_t ino = parent_ino(file->f_path.dentry);
301 dout("readdir off 1 -> '..'\n");
302 if (!dir_emit(ctx, "..", 2,
303 ceph_translate_ino(inode->i_sb, ino),
304 inode->i_mode >> 12))
305 return 0;
306 ctx->pos = 2;
307 off = 2;
308 }
309
310 /* can we use the dcache? */
311 spin_lock(&ci->i_ceph_lock);
312 if (ceph_test_mount_opt(fsc, DCACHE) &&
313 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
314 ceph_snap(inode) != CEPH_SNAPDIR &&
315 __ceph_dir_is_complete_ordered(ci) &&
316 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
317 u32 shared_gen = ci->i_shared_gen;
318 spin_unlock(&ci->i_ceph_lock);
319 err = __dcache_readdir(file, ctx, shared_gen);
320 if (err != -EAGAIN)
321 return err;
322 frag = fpos_frag(ctx->pos);
323 off = fpos_off(ctx->pos);
324 } else {
325 spin_unlock(&ci->i_ceph_lock);
326 }
327
328 /* proceed with a normal readdir */
329 more:
330 /* do we have the correct frag content buffered? */
331 if (fi->frag != frag || fi->last_readdir == NULL) {
332 struct ceph_mds_request *req;
333 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
334 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
335
336 /* discard old result, if any */
337 if (fi->last_readdir) {
338 ceph_mdsc_put_request(fi->last_readdir);
339 fi->last_readdir = NULL;
340 }
341
342 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
343 ceph_vinop(inode), frag, fi->last_name);
344 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
345 if (IS_ERR(req))
346 return PTR_ERR(req);
347 err = ceph_alloc_readdir_reply_buffer(req, inode);
348 if (err) {
349 ceph_mdsc_put_request(req);
350 return err;
351 }
352 /* hints to request -> mds selection code */
353 req->r_direct_mode = USE_AUTH_MDS;
354 req->r_direct_hash = ceph_frag_value(frag);
355 req->r_direct_is_hash = true;
356 if (fi->last_name) {
357 req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
358 if (!req->r_path2) {
359 ceph_mdsc_put_request(req);
360 return -ENOMEM;
361 }
362 }
363 req->r_dir_release_cnt = fi->dir_release_count;
364 req->r_dir_ordered_cnt = fi->dir_ordered_count;
365 req->r_readdir_cache_idx = fi->readdir_cache_idx;
366 req->r_readdir_offset = fi->next_offset;
367 req->r_args.readdir.frag = cpu_to_le32(frag);
368
369 req->r_inode = inode;
370 ihold(inode);
371 req->r_dentry = dget(file->f_path.dentry);
372 err = ceph_mdsc_do_request(mdsc, NULL, req);
373 if (err < 0) {
374 ceph_mdsc_put_request(req);
375 return err;
376 }
377 dout("readdir got and parsed readdir result=%d"
378 " on frag %x, end=%d, complete=%d\n", err, frag,
379 (int)req->r_reply_info.dir_end,
380 (int)req->r_reply_info.dir_complete);
381
382
383 /* note next offset and last dentry name */
384 rinfo = &req->r_reply_info;
385 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
386 frag = le32_to_cpu(rinfo->dir_dir->frag);
387 off = req->r_readdir_offset;
388 fi->next_offset = off;
389 }
390
391 fi->frag = frag;
392 fi->offset = fi->next_offset;
393 fi->last_readdir = req;
394
395 if (req->r_did_prepopulate) {
396 fi->readdir_cache_idx = req->r_readdir_cache_idx;
397 if (fi->readdir_cache_idx < 0) {
398 /* preclude from marking dir ordered */
399 fi->dir_ordered_count = 0;
400 } else if (ceph_frag_is_leftmost(frag) && off == 2) {
401 /* note dir version at start of readdir so
402 * we can tell if any dentries get dropped */
403 fi->dir_release_count = req->r_dir_release_cnt;
404 fi->dir_ordered_count = req->r_dir_ordered_cnt;
405 }
406 } else {
407 dout("readdir !did_prepopulate");
408 /* disable readdir cache */
409 fi->readdir_cache_idx = -1;
410 /* preclude from marking dir complete */
411 fi->dir_release_count = 0;
412 }
413
414 if (req->r_reply_info.dir_end) {
415 kfree(fi->last_name);
416 fi->last_name = NULL;
417 fi->next_offset = 2;
418 } else {
419 struct ceph_mds_reply_dir_entry *rde =
420 rinfo->dir_entries + (rinfo->dir_nr-1);
421 err = note_last_dentry(fi, rde->name, rde->name_len,
422 fi->next_offset + rinfo->dir_nr);
423 if (err)
424 return err;
425 }
426 }
427
428 rinfo = &fi->last_readdir->r_reply_info;
429 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
430 rinfo->dir_nr, off, fi->offset);
431
432 ctx->pos = ceph_make_fpos(frag, off);
433 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
434 struct ceph_mds_reply_dir_entry *rde =
435 rinfo->dir_entries + (off - fi->offset);
436 struct ceph_vino vino;
437 ino_t ino;
438
439 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
440 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
441 rde->name_len, rde->name, &rde->inode.in);
442 BUG_ON(!rde->inode.in);
443 ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
444 vino.ino = le64_to_cpu(rde->inode.in->ino);
445 vino.snap = le64_to_cpu(rde->inode.in->snapid);
446 ino = ceph_vino_to_ino(vino);
447 if (!dir_emit(ctx, rde->name, rde->name_len,
448 ceph_translate_ino(inode->i_sb, ino), ftype)) {
449 dout("filldir stopping us...\n");
450 return 0;
451 }
452 off++;
453 ctx->pos++;
454 }
455
456 if (fi->last_name) {
457 ceph_mdsc_put_request(fi->last_readdir);
458 fi->last_readdir = NULL;
459 goto more;
460 }
461
462 /* more frags? */
463 if (!ceph_frag_is_rightmost(frag)) {
464 frag = ceph_frag_next(frag);
465 off = 2;
466 ctx->pos = ceph_make_fpos(frag, off);
467 dout("readdir next frag is %x\n", frag);
468 goto more;
469 }
470 fi->flags |= CEPH_F_ATEND;
471
472 /*
473 * if dir_release_count still matches the dir, no dentries
474 * were released during the whole readdir, and we should have
475 * the complete dir contents in our cache.
476 */
477 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
478 spin_lock(&ci->i_ceph_lock);
479 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
480 dout(" marking %p complete and ordered\n", inode);
481 /* use i_size to track number of entries in
482 * readdir cache */
483 BUG_ON(fi->readdir_cache_idx < 0);
484 i_size_write(inode, fi->readdir_cache_idx *
485 sizeof(struct dentry*));
486 } else {
487 dout(" marking %p complete\n", inode);
488 }
489 __ceph_dir_set_complete(ci, fi->dir_release_count,
490 fi->dir_ordered_count);
491 spin_unlock(&ci->i_ceph_lock);
492 }
493
494 dout("readdir %p file %p done.\n", inode, file);
495 return 0;
496 }
497
498 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
499 {
500 if (fi->last_readdir) {
501 ceph_mdsc_put_request(fi->last_readdir);
502 fi->last_readdir = NULL;
503 }
504 kfree(fi->last_name);
505 fi->last_name = NULL;
506 fi->dir_release_count = 0;
507 fi->readdir_cache_idx = -1;
508 fi->next_offset = 2; /* compensate for . and .. */
509 fi->flags &= ~CEPH_F_ATEND;
510 }
511
512 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
513 {
514 struct ceph_file_info *fi = file->private_data;
515 struct inode *inode = file->f_mapping->host;
516 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
517 loff_t retval;
518
519 inode_lock(inode);
520 retval = -EINVAL;
521 switch (whence) {
522 case SEEK_CUR:
523 offset += file->f_pos;
524 case SEEK_SET:
525 break;
526 case SEEK_END:
527 retval = -EOPNOTSUPP;
528 default:
529 goto out;
530 }
531
532 if (offset >= 0) {
533 if (offset != file->f_pos) {
534 file->f_pos = offset;
535 file->f_version = 0;
536 fi->flags &= ~CEPH_F_ATEND;
537 }
538 retval = offset;
539
540 if (offset == 0 ||
541 fpos_frag(offset) != fi->frag ||
542 fpos_off(offset) < fi->offset) {
543 /* discard buffered readdir content on seekdir(0), or
544 * seek to new frag, or seek prior to current chunk */
545 dout("dir_llseek dropping %p content\n", file);
546 reset_readdir(fi, fpos_frag(offset));
547 } else if (fpos_cmp(offset, old_offset) > 0) {
548 /* reset dir_release_count if we did a forward seek */
549 fi->dir_release_count = 0;
550 fi->readdir_cache_idx = -1;
551 }
552 }
553 out:
554 inode_unlock(inode);
555 return retval;
556 }
557
558 /*
559 * Handle lookups for the hidden .snap directory.
560 */
561 int ceph_handle_snapdir(struct ceph_mds_request *req,
562 struct dentry *dentry, int err)
563 {
564 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
565 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
566
567 /* .snap dir? */
568 if (err == -ENOENT &&
569 ceph_snap(parent) == CEPH_NOSNAP &&
570 strcmp(dentry->d_name.name,
571 fsc->mount_options->snapdir_name) == 0) {
572 struct inode *inode = ceph_get_snapdir(parent);
573 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
574 dentry, dentry, inode);
575 BUG_ON(!d_unhashed(dentry));
576 d_add(dentry, inode);
577 err = 0;
578 }
579 return err;
580 }
581
582 /*
583 * Figure out final result of a lookup/open request.
584 *
585 * Mainly, make sure we return the final req->r_dentry (if it already
586 * existed) in place of the original VFS-provided dentry when they
587 * differ.
588 *
589 * Gracefully handle the case where the MDS replies with -ENOENT and
590 * no trace (which it may do, at its discretion, e.g., if it doesn't
591 * care to issue a lease on the negative dentry).
592 */
593 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
594 struct dentry *dentry, int err)
595 {
596 if (err == -ENOENT) {
597 /* no trace? */
598 err = 0;
599 if (!req->r_reply_info.head->is_dentry) {
600 dout("ENOENT and no trace, dentry %p inode %p\n",
601 dentry, d_inode(dentry));
602 if (d_really_is_positive(dentry)) {
603 d_drop(dentry);
604 err = -ENOENT;
605 } else {
606 d_add(dentry, NULL);
607 }
608 }
609 }
610 if (err)
611 dentry = ERR_PTR(err);
612 else if (dentry != req->r_dentry)
613 dentry = dget(req->r_dentry); /* we got spliced */
614 else
615 dentry = NULL;
616 return dentry;
617 }
618
619 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
620 {
621 return ceph_ino(inode) == CEPH_INO_ROOT &&
622 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
623 }
624
625 /*
626 * Look up a single dir entry. If there is a lookup intent, inform
627 * the MDS so that it gets our 'caps wanted' value in a single op.
628 */
629 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
630 unsigned int flags)
631 {
632 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
633 struct ceph_mds_client *mdsc = fsc->mdsc;
634 struct ceph_mds_request *req;
635 int op;
636 int mask;
637 int err;
638
639 dout("lookup %p dentry %p '%pd'\n",
640 dir, dentry, dentry);
641
642 if (dentry->d_name.len > NAME_MAX)
643 return ERR_PTR(-ENAMETOOLONG);
644
645 err = ceph_init_dentry(dentry);
646 if (err < 0)
647 return ERR_PTR(err);
648
649 /* can we conclude ENOENT locally? */
650 if (d_really_is_negative(dentry)) {
651 struct ceph_inode_info *ci = ceph_inode(dir);
652 struct ceph_dentry_info *di = ceph_dentry(dentry);
653
654 spin_lock(&ci->i_ceph_lock);
655 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
656 if (strncmp(dentry->d_name.name,
657 fsc->mount_options->snapdir_name,
658 dentry->d_name.len) &&
659 !is_root_ceph_dentry(dir, dentry) &&
660 ceph_test_mount_opt(fsc, DCACHE) &&
661 __ceph_dir_is_complete(ci) &&
662 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
663 spin_unlock(&ci->i_ceph_lock);
664 dout(" dir %p complete, -ENOENT\n", dir);
665 d_add(dentry, NULL);
666 di->lease_shared_gen = ci->i_shared_gen;
667 return NULL;
668 }
669 spin_unlock(&ci->i_ceph_lock);
670 }
671
672 op = ceph_snap(dir) == CEPH_SNAPDIR ?
673 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
674 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
675 if (IS_ERR(req))
676 return ERR_CAST(req);
677 req->r_dentry = dget(dentry);
678 req->r_num_caps = 2;
679
680 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
681 if (ceph_security_xattr_wanted(dir))
682 mask |= CEPH_CAP_XATTR_SHARED;
683 req->r_args.getattr.mask = cpu_to_le32(mask);
684
685 req->r_locked_dir = dir;
686 err = ceph_mdsc_do_request(mdsc, NULL, req);
687 err = ceph_handle_snapdir(req, dentry, err);
688 dentry = ceph_finish_lookup(req, dentry, err);
689 ceph_mdsc_put_request(req); /* will dput(dentry) */
690 dout("lookup result=%p\n", dentry);
691 return dentry;
692 }
693
694 /*
695 * If we do a create but get no trace back from the MDS, follow up with
696 * a lookup (the VFS expects us to link up the provided dentry).
697 */
698 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
699 {
700 struct dentry *result = ceph_lookup(dir, dentry, 0);
701
702 if (result && !IS_ERR(result)) {
703 /*
704 * We created the item, then did a lookup, and found
705 * it was already linked to another inode we already
706 * had in our cache (and thus got spliced). To not
707 * confuse VFS (especially when inode is a directory),
708 * we don't link our dentry to that inode, return an
709 * error instead.
710 *
711 * This event should be rare and it happens only when
712 * we talk to old MDS. Recent MDS does not send traceless
713 * reply for request that creates new inode.
714 */
715 d_drop(result);
716 return -ESTALE;
717 }
718 return PTR_ERR(result);
719 }
720
721 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
722 umode_t mode, dev_t rdev)
723 {
724 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
725 struct ceph_mds_client *mdsc = fsc->mdsc;
726 struct ceph_mds_request *req;
727 struct ceph_acls_info acls = {};
728 int err;
729
730 if (ceph_snap(dir) != CEPH_NOSNAP)
731 return -EROFS;
732
733 err = ceph_pre_init_acls(dir, &mode, &acls);
734 if (err < 0)
735 return err;
736
737 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
738 dir, dentry, mode, rdev);
739 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
740 if (IS_ERR(req)) {
741 err = PTR_ERR(req);
742 goto out;
743 }
744 req->r_dentry = dget(dentry);
745 req->r_num_caps = 2;
746 req->r_locked_dir = dir;
747 req->r_args.mknod.mode = cpu_to_le32(mode);
748 req->r_args.mknod.rdev = cpu_to_le32(rdev);
749 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
750 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
751 if (acls.pagelist) {
752 req->r_pagelist = acls.pagelist;
753 acls.pagelist = NULL;
754 }
755 err = ceph_mdsc_do_request(mdsc, dir, req);
756 if (!err && !req->r_reply_info.head->is_dentry)
757 err = ceph_handle_notrace_create(dir, dentry);
758 ceph_mdsc_put_request(req);
759 out:
760 if (!err)
761 ceph_init_inode_acls(d_inode(dentry), &acls);
762 else
763 d_drop(dentry);
764 ceph_release_acls_info(&acls);
765 return err;
766 }
767
768 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
769 bool excl)
770 {
771 return ceph_mknod(dir, dentry, mode, 0);
772 }
773
774 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
775 const char *dest)
776 {
777 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
778 struct ceph_mds_client *mdsc = fsc->mdsc;
779 struct ceph_mds_request *req;
780 int err;
781
782 if (ceph_snap(dir) != CEPH_NOSNAP)
783 return -EROFS;
784
785 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
786 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
787 if (IS_ERR(req)) {
788 err = PTR_ERR(req);
789 goto out;
790 }
791 req->r_path2 = kstrdup(dest, GFP_KERNEL);
792 if (!req->r_path2) {
793 err = -ENOMEM;
794 ceph_mdsc_put_request(req);
795 goto out;
796 }
797 req->r_locked_dir = dir;
798 req->r_dentry = dget(dentry);
799 req->r_num_caps = 2;
800 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
801 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
802 err = ceph_mdsc_do_request(mdsc, dir, req);
803 if (!err && !req->r_reply_info.head->is_dentry)
804 err = ceph_handle_notrace_create(dir, dentry);
805 ceph_mdsc_put_request(req);
806 out:
807 if (err)
808 d_drop(dentry);
809 return err;
810 }
811
812 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
813 {
814 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
815 struct ceph_mds_client *mdsc = fsc->mdsc;
816 struct ceph_mds_request *req;
817 struct ceph_acls_info acls = {};
818 int err = -EROFS;
819 int op;
820
821 if (ceph_snap(dir) == CEPH_SNAPDIR) {
822 /* mkdir .snap/foo is a MKSNAP */
823 op = CEPH_MDS_OP_MKSNAP;
824 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
825 dentry, dentry);
826 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
827 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
828 op = CEPH_MDS_OP_MKDIR;
829 } else {
830 goto out;
831 }
832
833 mode |= S_IFDIR;
834 err = ceph_pre_init_acls(dir, &mode, &acls);
835 if (err < 0)
836 goto out;
837
838 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
839 if (IS_ERR(req)) {
840 err = PTR_ERR(req);
841 goto out;
842 }
843
844 req->r_dentry = dget(dentry);
845 req->r_num_caps = 2;
846 req->r_locked_dir = dir;
847 req->r_args.mkdir.mode = cpu_to_le32(mode);
848 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
849 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
850 if (acls.pagelist) {
851 req->r_pagelist = acls.pagelist;
852 acls.pagelist = NULL;
853 }
854 err = ceph_mdsc_do_request(mdsc, dir, req);
855 if (!err &&
856 !req->r_reply_info.head->is_target &&
857 !req->r_reply_info.head->is_dentry)
858 err = ceph_handle_notrace_create(dir, dentry);
859 ceph_mdsc_put_request(req);
860 out:
861 if (!err)
862 ceph_init_inode_acls(d_inode(dentry), &acls);
863 else
864 d_drop(dentry);
865 ceph_release_acls_info(&acls);
866 return err;
867 }
868
869 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
870 struct dentry *dentry)
871 {
872 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
873 struct ceph_mds_client *mdsc = fsc->mdsc;
874 struct ceph_mds_request *req;
875 int err;
876
877 if (ceph_snap(dir) != CEPH_NOSNAP)
878 return -EROFS;
879
880 dout("link in dir %p old_dentry %p dentry %p\n", dir,
881 old_dentry, dentry);
882 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
883 if (IS_ERR(req)) {
884 d_drop(dentry);
885 return PTR_ERR(req);
886 }
887 req->r_dentry = dget(dentry);
888 req->r_num_caps = 2;
889 req->r_old_dentry = dget(old_dentry);
890 req->r_locked_dir = dir;
891 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
892 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
893 /* release LINK_SHARED on source inode (mds will lock it) */
894 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
895 err = ceph_mdsc_do_request(mdsc, dir, req);
896 if (err) {
897 d_drop(dentry);
898 } else if (!req->r_reply_info.head->is_dentry) {
899 ihold(d_inode(old_dentry));
900 d_instantiate(dentry, d_inode(old_dentry));
901 }
902 ceph_mdsc_put_request(req);
903 return err;
904 }
905
906 /*
907 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
908 * looks like the link count will hit 0, drop any other caps (other
909 * than PIN) we don't specifically want (due to the file still being
910 * open).
911 */
912 static int drop_caps_for_unlink(struct inode *inode)
913 {
914 struct ceph_inode_info *ci = ceph_inode(inode);
915 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
916
917 spin_lock(&ci->i_ceph_lock);
918 if (inode->i_nlink == 1) {
919 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
920 ci->i_ceph_flags |= CEPH_I_NODELAY;
921 }
922 spin_unlock(&ci->i_ceph_lock);
923 return drop;
924 }
925
926 /*
927 * rmdir and unlink are differ only by the metadata op code
928 */
929 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
930 {
931 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
932 struct ceph_mds_client *mdsc = fsc->mdsc;
933 struct inode *inode = d_inode(dentry);
934 struct ceph_mds_request *req;
935 int err = -EROFS;
936 int op;
937
938 if (ceph_snap(dir) == CEPH_SNAPDIR) {
939 /* rmdir .snap/foo is RMSNAP */
940 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
941 op = CEPH_MDS_OP_RMSNAP;
942 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
943 dout("unlink/rmdir dir %p dn %p inode %p\n",
944 dir, dentry, inode);
945 op = d_is_dir(dentry) ?
946 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
947 } else
948 goto out;
949 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
950 if (IS_ERR(req)) {
951 err = PTR_ERR(req);
952 goto out;
953 }
954 req->r_dentry = dget(dentry);
955 req->r_num_caps = 2;
956 req->r_locked_dir = dir;
957 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
958 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
959 req->r_inode_drop = drop_caps_for_unlink(inode);
960 err = ceph_mdsc_do_request(mdsc, dir, req);
961 if (!err && !req->r_reply_info.head->is_dentry)
962 d_delete(dentry);
963 ceph_mdsc_put_request(req);
964 out:
965 return err;
966 }
967
968 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
969 struct inode *new_dir, struct dentry *new_dentry)
970 {
971 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
972 struct ceph_mds_client *mdsc = fsc->mdsc;
973 struct ceph_mds_request *req;
974 int op = CEPH_MDS_OP_RENAME;
975 int err;
976
977 if (ceph_snap(old_dir) != ceph_snap(new_dir))
978 return -EXDEV;
979 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
980 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
981 op = CEPH_MDS_OP_RENAMESNAP;
982 else
983 return -EROFS;
984 }
985 dout("rename dir %p dentry %p to dir %p dentry %p\n",
986 old_dir, old_dentry, new_dir, new_dentry);
987 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
988 if (IS_ERR(req))
989 return PTR_ERR(req);
990 ihold(old_dir);
991 req->r_dentry = dget(new_dentry);
992 req->r_num_caps = 2;
993 req->r_old_dentry = dget(old_dentry);
994 req->r_old_dentry_dir = old_dir;
995 req->r_locked_dir = new_dir;
996 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
997 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
998 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
999 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1000 /* release LINK_RDCACHE on source inode (mds will lock it) */
1001 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
1002 if (d_really_is_positive(new_dentry))
1003 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
1004 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1005 if (!err && !req->r_reply_info.head->is_dentry) {
1006 /*
1007 * Normally d_move() is done by fill_trace (called by
1008 * do_request, above). If there is no trace, we need
1009 * to do it here.
1010 */
1011
1012 /* d_move screws up sibling dentries' offsets */
1013 ceph_dir_clear_complete(old_dir);
1014 ceph_dir_clear_complete(new_dir);
1015
1016 d_move(old_dentry, new_dentry);
1017
1018 /* ensure target dentry is invalidated, despite
1019 rehashing bug in vfs_rename_dir */
1020 ceph_invalidate_dentry_lease(new_dentry);
1021 }
1022 ceph_mdsc_put_request(req);
1023 return err;
1024 }
1025
1026 /*
1027 * Ensure a dentry lease will no longer revalidate.
1028 */
1029 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1030 {
1031 spin_lock(&dentry->d_lock);
1032 dentry->d_time = jiffies;
1033 ceph_dentry(dentry)->lease_shared_gen = 0;
1034 spin_unlock(&dentry->d_lock);
1035 }
1036
1037 /*
1038 * Check if dentry lease is valid. If not, delete the lease. Try to
1039 * renew if the least is more than half up.
1040 */
1041 static int dentry_lease_is_valid(struct dentry *dentry)
1042 {
1043 struct ceph_dentry_info *di;
1044 struct ceph_mds_session *s;
1045 int valid = 0;
1046 u32 gen;
1047 unsigned long ttl;
1048 struct ceph_mds_session *session = NULL;
1049 struct inode *dir = NULL;
1050 u32 seq = 0;
1051
1052 spin_lock(&dentry->d_lock);
1053 di = ceph_dentry(dentry);
1054 if (di->lease_session) {
1055 s = di->lease_session;
1056 spin_lock(&s->s_gen_ttl_lock);
1057 gen = s->s_cap_gen;
1058 ttl = s->s_cap_ttl;
1059 spin_unlock(&s->s_gen_ttl_lock);
1060
1061 if (di->lease_gen == gen &&
1062 time_before(jiffies, dentry->d_time) &&
1063 time_before(jiffies, ttl)) {
1064 valid = 1;
1065 if (di->lease_renew_after &&
1066 time_after(jiffies, di->lease_renew_after)) {
1067 /* we should renew */
1068 dir = d_inode(dentry->d_parent);
1069 session = ceph_get_mds_session(s);
1070 seq = di->lease_seq;
1071 di->lease_renew_after = 0;
1072 di->lease_renew_from = jiffies;
1073 }
1074 }
1075 }
1076 spin_unlock(&dentry->d_lock);
1077
1078 if (session) {
1079 ceph_mdsc_lease_send_msg(session, dir, dentry,
1080 CEPH_MDS_LEASE_RENEW, seq);
1081 ceph_put_mds_session(session);
1082 }
1083 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1084 return valid;
1085 }
1086
1087 /*
1088 * Check if directory-wide content lease/cap is valid.
1089 */
1090 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1091 {
1092 struct ceph_inode_info *ci = ceph_inode(dir);
1093 struct ceph_dentry_info *di = ceph_dentry(dentry);
1094 int valid = 0;
1095
1096 spin_lock(&ci->i_ceph_lock);
1097 if (ci->i_shared_gen == di->lease_shared_gen)
1098 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1099 spin_unlock(&ci->i_ceph_lock);
1100 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1101 dir, (unsigned)ci->i_shared_gen, dentry,
1102 (unsigned)di->lease_shared_gen, valid);
1103 return valid;
1104 }
1105
1106 /*
1107 * Check if cached dentry can be trusted.
1108 */
1109 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1110 {
1111 int valid = 0;
1112 struct dentry *parent;
1113 struct inode *dir;
1114
1115 if (flags & LOOKUP_RCU)
1116 return -ECHILD;
1117
1118 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1119 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1120
1121 parent = dget_parent(dentry);
1122 dir = d_inode(parent);
1123
1124 /* always trust cached snapped dentries, snapdir dentry */
1125 if (ceph_snap(dir) != CEPH_NOSNAP) {
1126 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1127 dentry, d_inode(dentry));
1128 valid = 1;
1129 } else if (d_really_is_positive(dentry) &&
1130 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1131 valid = 1;
1132 } else if (dentry_lease_is_valid(dentry) ||
1133 dir_lease_is_valid(dir, dentry)) {
1134 if (d_really_is_positive(dentry))
1135 valid = ceph_is_any_caps(d_inode(dentry));
1136 else
1137 valid = 1;
1138 }
1139
1140 if (!valid) {
1141 struct ceph_mds_client *mdsc =
1142 ceph_sb_to_client(dir->i_sb)->mdsc;
1143 struct ceph_mds_request *req;
1144 int op, mask, err;
1145
1146 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1147 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1148 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1149 if (!IS_ERR(req)) {
1150 req->r_dentry = dget(dentry);
1151 req->r_num_caps = 2;
1152
1153 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1154 if (ceph_security_xattr_wanted(dir))
1155 mask |= CEPH_CAP_XATTR_SHARED;
1156 req->r_args.getattr.mask = mask;
1157
1158 req->r_locked_dir = dir;
1159 err = ceph_mdsc_do_request(mdsc, NULL, req);
1160 if (err == 0 || err == -ENOENT) {
1161 if (dentry == req->r_dentry) {
1162 valid = !d_unhashed(dentry);
1163 } else {
1164 d_invalidate(req->r_dentry);
1165 err = -EAGAIN;
1166 }
1167 }
1168 ceph_mdsc_put_request(req);
1169 dout("d_revalidate %p lookup result=%d\n",
1170 dentry, err);
1171 }
1172 }
1173
1174 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1175 if (valid) {
1176 ceph_dentry_lru_touch(dentry);
1177 } else {
1178 ceph_dir_clear_complete(dir);
1179 }
1180
1181 dput(parent);
1182 return valid;
1183 }
1184
1185 /*
1186 * Release our ceph_dentry_info.
1187 */
1188 static void ceph_d_release(struct dentry *dentry)
1189 {
1190 struct ceph_dentry_info *di = ceph_dentry(dentry);
1191
1192 dout("d_release %p\n", dentry);
1193 ceph_dentry_lru_del(dentry);
1194 if (di->lease_session)
1195 ceph_put_mds_session(di->lease_session);
1196 kmem_cache_free(ceph_dentry_cachep, di);
1197 dentry->d_fsdata = NULL;
1198 }
1199
1200 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1201 unsigned int flags)
1202 {
1203 /*
1204 * Eventually, we'll want to revalidate snapped metadata
1205 * too... probably...
1206 */
1207 return 1;
1208 }
1209
1210 /*
1211 * When the VFS prunes a dentry from the cache, we need to clear the
1212 * complete flag on the parent directory.
1213 *
1214 * Called under dentry->d_lock.
1215 */
1216 static void ceph_d_prune(struct dentry *dentry)
1217 {
1218 dout("ceph_d_prune %p\n", dentry);
1219
1220 /* do we have a valid parent? */
1221 if (IS_ROOT(dentry))
1222 return;
1223
1224 /* if we are not hashed, we don't affect dir's completeness */
1225 if (d_unhashed(dentry))
1226 return;
1227
1228 /*
1229 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1230 * cleared until d_release
1231 */
1232 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1233 }
1234
1235 /*
1236 * read() on a dir. This weird interface hack only works if mounted
1237 * with '-o dirstat'.
1238 */
1239 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1240 loff_t *ppos)
1241 {
1242 struct ceph_file_info *cf = file->private_data;
1243 struct inode *inode = file_inode(file);
1244 struct ceph_inode_info *ci = ceph_inode(inode);
1245 int left;
1246 const int bufsize = 1024;
1247
1248 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1249 return -EISDIR;
1250
1251 if (!cf->dir_info) {
1252 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1253 if (!cf->dir_info)
1254 return -ENOMEM;
1255 cf->dir_info_len =
1256 snprintf(cf->dir_info, bufsize,
1257 "entries: %20lld\n"
1258 " files: %20lld\n"
1259 " subdirs: %20lld\n"
1260 "rentries: %20lld\n"
1261 " rfiles: %20lld\n"
1262 " rsubdirs: %20lld\n"
1263 "rbytes: %20lld\n"
1264 "rctime: %10ld.%09ld\n",
1265 ci->i_files + ci->i_subdirs,
1266 ci->i_files,
1267 ci->i_subdirs,
1268 ci->i_rfiles + ci->i_rsubdirs,
1269 ci->i_rfiles,
1270 ci->i_rsubdirs,
1271 ci->i_rbytes,
1272 (long)ci->i_rctime.tv_sec,
1273 (long)ci->i_rctime.tv_nsec);
1274 }
1275
1276 if (*ppos >= cf->dir_info_len)
1277 return 0;
1278 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1279 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1280 if (left == size)
1281 return -EFAULT;
1282 *ppos += (size - left);
1283 return size - left;
1284 }
1285
1286 /*
1287 * We maintain a private dentry LRU.
1288 *
1289 * FIXME: this needs to be changed to a per-mds lru to be useful.
1290 */
1291 void ceph_dentry_lru_add(struct dentry *dn)
1292 {
1293 struct ceph_dentry_info *di = ceph_dentry(dn);
1294 struct ceph_mds_client *mdsc;
1295
1296 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1297 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1298 spin_lock(&mdsc->dentry_lru_lock);
1299 list_add_tail(&di->lru, &mdsc->dentry_lru);
1300 mdsc->num_dentry++;
1301 spin_unlock(&mdsc->dentry_lru_lock);
1302 }
1303
1304 void ceph_dentry_lru_touch(struct dentry *dn)
1305 {
1306 struct ceph_dentry_info *di = ceph_dentry(dn);
1307 struct ceph_mds_client *mdsc;
1308
1309 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1310 di->offset);
1311 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1312 spin_lock(&mdsc->dentry_lru_lock);
1313 list_move_tail(&di->lru, &mdsc->dentry_lru);
1314 spin_unlock(&mdsc->dentry_lru_lock);
1315 }
1316
1317 void ceph_dentry_lru_del(struct dentry *dn)
1318 {
1319 struct ceph_dentry_info *di = ceph_dentry(dn);
1320 struct ceph_mds_client *mdsc;
1321
1322 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1323 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1324 spin_lock(&mdsc->dentry_lru_lock);
1325 list_del_init(&di->lru);
1326 mdsc->num_dentry--;
1327 spin_unlock(&mdsc->dentry_lru_lock);
1328 }
1329
1330 /*
1331 * Return name hash for a given dentry. This is dependent on
1332 * the parent directory's hash function.
1333 */
1334 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1335 {
1336 struct ceph_inode_info *dci = ceph_inode(dir);
1337
1338 switch (dci->i_dir_layout.dl_dir_hash) {
1339 case 0: /* for backward compat */
1340 case CEPH_STR_HASH_LINUX:
1341 return dn->d_name.hash;
1342
1343 default:
1344 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1345 dn->d_name.name, dn->d_name.len);
1346 }
1347 }
1348
1349 const struct file_operations ceph_dir_fops = {
1350 .read = ceph_read_dir,
1351 .iterate = ceph_readdir,
1352 .llseek = ceph_dir_llseek,
1353 .open = ceph_open,
1354 .release = ceph_release,
1355 .unlocked_ioctl = ceph_ioctl,
1356 .fsync = ceph_fsync,
1357 };
1358
1359 const struct file_operations ceph_snapdir_fops = {
1360 .iterate = ceph_readdir,
1361 .llseek = ceph_dir_llseek,
1362 .open = ceph_open,
1363 .release = ceph_release,
1364 };
1365
1366 const struct inode_operations ceph_dir_iops = {
1367 .lookup = ceph_lookup,
1368 .permission = ceph_permission,
1369 .getattr = ceph_getattr,
1370 .setattr = ceph_setattr,
1371 .setxattr = ceph_setxattr,
1372 .getxattr = ceph_getxattr,
1373 .listxattr = ceph_listxattr,
1374 .removexattr = ceph_removexattr,
1375 .get_acl = ceph_get_acl,
1376 .set_acl = ceph_set_acl,
1377 .mknod = ceph_mknod,
1378 .symlink = ceph_symlink,
1379 .mkdir = ceph_mkdir,
1380 .link = ceph_link,
1381 .unlink = ceph_unlink,
1382 .rmdir = ceph_unlink,
1383 .rename = ceph_rename,
1384 .create = ceph_create,
1385 .atomic_open = ceph_atomic_open,
1386 };
1387
1388 const struct inode_operations ceph_snapdir_iops = {
1389 .lookup = ceph_lookup,
1390 .permission = ceph_permission,
1391 .getattr = ceph_getattr,
1392 .mkdir = ceph_mkdir,
1393 .rmdir = ceph_unlink,
1394 .rename = ceph_rename,
1395 };
1396
1397 const struct dentry_operations ceph_dentry_ops = {
1398 .d_revalidate = ceph_d_revalidate,
1399 .d_release = ceph_d_release,
1400 .d_prune = ceph_d_prune,
1401 };
1402
1403 const struct dentry_operations ceph_snapdir_dentry_ops = {
1404 .d_revalidate = ceph_snapdir_d_revalidate,
1405 .d_release = ceph_d_release,
1406 };
1407
1408 const struct dentry_operations ceph_snap_dentry_ops = {
1409 .d_release = ceph_d_release,
1410 .d_prune = ceph_d_prune,
1411 };
Linux kernel - Deliverables
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