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ceph: simplify 'offset in frag'
[mirror_ubuntu-bionic-kernel.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 err = note_last_dentry(fi,
420 rinfo->dir_dname[rinfo->dir_nr-1],
421 rinfo->dir_dname_len[rinfo->dir_nr-1],
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_inode *in =
435 rinfo->dir_in[off - fi->offset].in;
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 rinfo->dir_dname_len[off - fi->offset],
442 rinfo->dir_dname[off - fi->offset], in);
443 BUG_ON(!in);
444 ftype = le32_to_cpu(in->mode) >> 12;
445 vino.ino = le64_to_cpu(in->ino);
446 vino.snap = le64_to_cpu(in->snapid);
447 ino = ceph_vino_to_ino(vino);
448 if (!dir_emit(ctx,
449 rinfo->dir_dname[off - fi->offset],
450 rinfo->dir_dname_len[off - fi->offset],
451 ceph_translate_ino(inode->i_sb, ino), ftype)) {
452 dout("filldir stopping us...\n");
453 return 0;
454 }
455 off++;
456 ctx->pos++;
457 }
458
459 if (fi->last_name) {
460 ceph_mdsc_put_request(fi->last_readdir);
461 fi->last_readdir = NULL;
462 goto more;
463 }
464
465 /* more frags? */
466 if (!ceph_frag_is_rightmost(frag)) {
467 frag = ceph_frag_next(frag);
468 off = 2;
469 ctx->pos = ceph_make_fpos(frag, off);
470 dout("readdir next frag is %x\n", frag);
471 goto more;
472 }
473 fi->flags |= CEPH_F_ATEND;
474
475 /*
476 * if dir_release_count still matches the dir, no dentries
477 * were released during the whole readdir, and we should have
478 * the complete dir contents in our cache.
479 */
480 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
481 spin_lock(&ci->i_ceph_lock);
482 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
483 dout(" marking %p complete and ordered\n", inode);
484 /* use i_size to track number of entries in
485 * readdir cache */
486 BUG_ON(fi->readdir_cache_idx < 0);
487 i_size_write(inode, fi->readdir_cache_idx *
488 sizeof(struct dentry*));
489 } else {
490 dout(" marking %p complete\n", inode);
491 }
492 __ceph_dir_set_complete(ci, fi->dir_release_count,
493 fi->dir_ordered_count);
494 spin_unlock(&ci->i_ceph_lock);
495 }
496
497 dout("readdir %p file %p done.\n", inode, file);
498 return 0;
499 }
500
501 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
502 {
503 if (fi->last_readdir) {
504 ceph_mdsc_put_request(fi->last_readdir);
505 fi->last_readdir = NULL;
506 }
507 kfree(fi->last_name);
508 fi->last_name = NULL;
509 fi->dir_release_count = 0;
510 fi->readdir_cache_idx = -1;
511 fi->next_offset = 2; /* compensate for . and .. */
512 fi->flags &= ~CEPH_F_ATEND;
513 }
514
515 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
516 {
517 struct ceph_file_info *fi = file->private_data;
518 struct inode *inode = file->f_mapping->host;
519 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
520 loff_t retval;
521
522 inode_lock(inode);
523 retval = -EINVAL;
524 switch (whence) {
525 case SEEK_CUR:
526 offset += file->f_pos;
527 case SEEK_SET:
528 break;
529 case SEEK_END:
530 retval = -EOPNOTSUPP;
531 default:
532 goto out;
533 }
534
535 if (offset >= 0) {
536 if (offset != file->f_pos) {
537 file->f_pos = offset;
538 file->f_version = 0;
539 fi->flags &= ~CEPH_F_ATEND;
540 }
541 retval = offset;
542
543 if (offset == 0 ||
544 fpos_frag(offset) != fi->frag ||
545 fpos_off(offset) < fi->offset) {
546 /* discard buffered readdir content on seekdir(0), or
547 * seek to new frag, or seek prior to current chunk */
548 dout("dir_llseek dropping %p content\n", file);
549 reset_readdir(fi, fpos_frag(offset));
550 } else if (fpos_cmp(offset, old_offset) > 0) {
551 /* reset dir_release_count if we did a forward seek */
552 fi->dir_release_count = 0;
553 fi->readdir_cache_idx = -1;
554 }
555 }
556 out:
557 inode_unlock(inode);
558 return retval;
559 }
560
561 /*
562 * Handle lookups for the hidden .snap directory.
563 */
564 int ceph_handle_snapdir(struct ceph_mds_request *req,
565 struct dentry *dentry, int err)
566 {
567 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
568 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
569
570 /* .snap dir? */
571 if (err == -ENOENT &&
572 ceph_snap(parent) == CEPH_NOSNAP &&
573 strcmp(dentry->d_name.name,
574 fsc->mount_options->snapdir_name) == 0) {
575 struct inode *inode = ceph_get_snapdir(parent);
576 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
577 dentry, dentry, inode);
578 BUG_ON(!d_unhashed(dentry));
579 d_add(dentry, inode);
580 err = 0;
581 }
582 return err;
583 }
584
585 /*
586 * Figure out final result of a lookup/open request.
587 *
588 * Mainly, make sure we return the final req->r_dentry (if it already
589 * existed) in place of the original VFS-provided dentry when they
590 * differ.
591 *
592 * Gracefully handle the case where the MDS replies with -ENOENT and
593 * no trace (which it may do, at its discretion, e.g., if it doesn't
594 * care to issue a lease on the negative dentry).
595 */
596 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
597 struct dentry *dentry, int err)
598 {
599 if (err == -ENOENT) {
600 /* no trace? */
601 err = 0;
602 if (!req->r_reply_info.head->is_dentry) {
603 dout("ENOENT and no trace, dentry %p inode %p\n",
604 dentry, d_inode(dentry));
605 if (d_really_is_positive(dentry)) {
606 d_drop(dentry);
607 err = -ENOENT;
608 } else {
609 d_add(dentry, NULL);
610 }
611 }
612 }
613 if (err)
614 dentry = ERR_PTR(err);
615 else if (dentry != req->r_dentry)
616 dentry = dget(req->r_dentry); /* we got spliced */
617 else
618 dentry = NULL;
619 return dentry;
620 }
621
622 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
623 {
624 return ceph_ino(inode) == CEPH_INO_ROOT &&
625 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
626 }
627
628 /*
629 * Look up a single dir entry. If there is a lookup intent, inform
630 * the MDS so that it gets our 'caps wanted' value in a single op.
631 */
632 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
633 unsigned int flags)
634 {
635 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
636 struct ceph_mds_client *mdsc = fsc->mdsc;
637 struct ceph_mds_request *req;
638 int op;
639 int mask;
640 int err;
641
642 dout("lookup %p dentry %p '%pd'\n",
643 dir, dentry, dentry);
644
645 if (dentry->d_name.len > NAME_MAX)
646 return ERR_PTR(-ENAMETOOLONG);
647
648 err = ceph_init_dentry(dentry);
649 if (err < 0)
650 return ERR_PTR(err);
651
652 /* can we conclude ENOENT locally? */
653 if (d_really_is_negative(dentry)) {
654 struct ceph_inode_info *ci = ceph_inode(dir);
655 struct ceph_dentry_info *di = ceph_dentry(dentry);
656
657 spin_lock(&ci->i_ceph_lock);
658 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
659 if (strncmp(dentry->d_name.name,
660 fsc->mount_options->snapdir_name,
661 dentry->d_name.len) &&
662 !is_root_ceph_dentry(dir, dentry) &&
663 ceph_test_mount_opt(fsc, DCACHE) &&
664 __ceph_dir_is_complete(ci) &&
665 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
666 spin_unlock(&ci->i_ceph_lock);
667 dout(" dir %p complete, -ENOENT\n", dir);
668 d_add(dentry, NULL);
669 di->lease_shared_gen = ci->i_shared_gen;
670 return NULL;
671 }
672 spin_unlock(&ci->i_ceph_lock);
673 }
674
675 op = ceph_snap(dir) == CEPH_SNAPDIR ?
676 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
677 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
678 if (IS_ERR(req))
679 return ERR_CAST(req);
680 req->r_dentry = dget(dentry);
681 req->r_num_caps = 2;
682
683 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
684 if (ceph_security_xattr_wanted(dir))
685 mask |= CEPH_CAP_XATTR_SHARED;
686 req->r_args.getattr.mask = cpu_to_le32(mask);
687
688 req->r_locked_dir = dir;
689 err = ceph_mdsc_do_request(mdsc, NULL, req);
690 err = ceph_handle_snapdir(req, dentry, err);
691 dentry = ceph_finish_lookup(req, dentry, err);
692 ceph_mdsc_put_request(req); /* will dput(dentry) */
693 dout("lookup result=%p\n", dentry);
694 return dentry;
695 }
696
697 /*
698 * If we do a create but get no trace back from the MDS, follow up with
699 * a lookup (the VFS expects us to link up the provided dentry).
700 */
701 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
702 {
703 struct dentry *result = ceph_lookup(dir, dentry, 0);
704
705 if (result && !IS_ERR(result)) {
706 /*
707 * We created the item, then did a lookup, and found
708 * it was already linked to another inode we already
709 * had in our cache (and thus got spliced). To not
710 * confuse VFS (especially when inode is a directory),
711 * we don't link our dentry to that inode, return an
712 * error instead.
713 *
714 * This event should be rare and it happens only when
715 * we talk to old MDS. Recent MDS does not send traceless
716 * reply for request that creates new inode.
717 */
718 d_drop(result);
719 return -ESTALE;
720 }
721 return PTR_ERR(result);
722 }
723
724 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
725 umode_t mode, dev_t rdev)
726 {
727 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
728 struct ceph_mds_client *mdsc = fsc->mdsc;
729 struct ceph_mds_request *req;
730 struct ceph_acls_info acls = {};
731 int err;
732
733 if (ceph_snap(dir) != CEPH_NOSNAP)
734 return -EROFS;
735
736 err = ceph_pre_init_acls(dir, &mode, &acls);
737 if (err < 0)
738 return err;
739
740 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
741 dir, dentry, mode, rdev);
742 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
743 if (IS_ERR(req)) {
744 err = PTR_ERR(req);
745 goto out;
746 }
747 req->r_dentry = dget(dentry);
748 req->r_num_caps = 2;
749 req->r_locked_dir = dir;
750 req->r_args.mknod.mode = cpu_to_le32(mode);
751 req->r_args.mknod.rdev = cpu_to_le32(rdev);
752 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
753 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
754 if (acls.pagelist) {
755 req->r_pagelist = acls.pagelist;
756 acls.pagelist = NULL;
757 }
758 err = ceph_mdsc_do_request(mdsc, dir, req);
759 if (!err && !req->r_reply_info.head->is_dentry)
760 err = ceph_handle_notrace_create(dir, dentry);
761 ceph_mdsc_put_request(req);
762 out:
763 if (!err)
764 ceph_init_inode_acls(d_inode(dentry), &acls);
765 else
766 d_drop(dentry);
767 ceph_release_acls_info(&acls);
768 return err;
769 }
770
771 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
772 bool excl)
773 {
774 return ceph_mknod(dir, dentry, mode, 0);
775 }
776
777 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
778 const char *dest)
779 {
780 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
781 struct ceph_mds_client *mdsc = fsc->mdsc;
782 struct ceph_mds_request *req;
783 int err;
784
785 if (ceph_snap(dir) != CEPH_NOSNAP)
786 return -EROFS;
787
788 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
789 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
790 if (IS_ERR(req)) {
791 err = PTR_ERR(req);
792 goto out;
793 }
794 req->r_path2 = kstrdup(dest, GFP_KERNEL);
795 if (!req->r_path2) {
796 err = -ENOMEM;
797 ceph_mdsc_put_request(req);
798 goto out;
799 }
800 req->r_locked_dir = dir;
801 req->r_dentry = dget(dentry);
802 req->r_num_caps = 2;
803 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
804 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
805 err = ceph_mdsc_do_request(mdsc, dir, req);
806 if (!err && !req->r_reply_info.head->is_dentry)
807 err = ceph_handle_notrace_create(dir, dentry);
808 ceph_mdsc_put_request(req);
809 out:
810 if (err)
811 d_drop(dentry);
812 return err;
813 }
814
815 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
816 {
817 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
818 struct ceph_mds_client *mdsc = fsc->mdsc;
819 struct ceph_mds_request *req;
820 struct ceph_acls_info acls = {};
821 int err = -EROFS;
822 int op;
823
824 if (ceph_snap(dir) == CEPH_SNAPDIR) {
825 /* mkdir .snap/foo is a MKSNAP */
826 op = CEPH_MDS_OP_MKSNAP;
827 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
828 dentry, dentry);
829 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
830 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
831 op = CEPH_MDS_OP_MKDIR;
832 } else {
833 goto out;
834 }
835
836 mode |= S_IFDIR;
837 err = ceph_pre_init_acls(dir, &mode, &acls);
838 if (err < 0)
839 goto out;
840
841 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
842 if (IS_ERR(req)) {
843 err = PTR_ERR(req);
844 goto out;
845 }
846
847 req->r_dentry = dget(dentry);
848 req->r_num_caps = 2;
849 req->r_locked_dir = dir;
850 req->r_args.mkdir.mode = cpu_to_le32(mode);
851 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
852 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
853 if (acls.pagelist) {
854 req->r_pagelist = acls.pagelist;
855 acls.pagelist = NULL;
856 }
857 err = ceph_mdsc_do_request(mdsc, dir, req);
858 if (!err &&
859 !req->r_reply_info.head->is_target &&
860 !req->r_reply_info.head->is_dentry)
861 err = ceph_handle_notrace_create(dir, dentry);
862 ceph_mdsc_put_request(req);
863 out:
864 if (!err)
865 ceph_init_inode_acls(d_inode(dentry), &acls);
866 else
867 d_drop(dentry);
868 ceph_release_acls_info(&acls);
869 return err;
870 }
871
872 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
873 struct dentry *dentry)
874 {
875 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
876 struct ceph_mds_client *mdsc = fsc->mdsc;
877 struct ceph_mds_request *req;
878 int err;
879
880 if (ceph_snap(dir) != CEPH_NOSNAP)
881 return -EROFS;
882
883 dout("link in dir %p old_dentry %p dentry %p\n", dir,
884 old_dentry, dentry);
885 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
886 if (IS_ERR(req)) {
887 d_drop(dentry);
888 return PTR_ERR(req);
889 }
890 req->r_dentry = dget(dentry);
891 req->r_num_caps = 2;
892 req->r_old_dentry = dget(old_dentry);
893 req->r_locked_dir = dir;
894 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
895 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
896 /* release LINK_SHARED on source inode (mds will lock it) */
897 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
898 err = ceph_mdsc_do_request(mdsc, dir, req);
899 if (err) {
900 d_drop(dentry);
901 } else if (!req->r_reply_info.head->is_dentry) {
902 ihold(d_inode(old_dentry));
903 d_instantiate(dentry, d_inode(old_dentry));
904 }
905 ceph_mdsc_put_request(req);
906 return err;
907 }
908
909 /*
910 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
911 * looks like the link count will hit 0, drop any other caps (other
912 * than PIN) we don't specifically want (due to the file still being
913 * open).
914 */
915 static int drop_caps_for_unlink(struct inode *inode)
916 {
917 struct ceph_inode_info *ci = ceph_inode(inode);
918 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
919
920 spin_lock(&ci->i_ceph_lock);
921 if (inode->i_nlink == 1) {
922 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
923 ci->i_ceph_flags |= CEPH_I_NODELAY;
924 }
925 spin_unlock(&ci->i_ceph_lock);
926 return drop;
927 }
928
929 /*
930 * rmdir and unlink are differ only by the metadata op code
931 */
932 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
933 {
934 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
935 struct ceph_mds_client *mdsc = fsc->mdsc;
936 struct inode *inode = d_inode(dentry);
937 struct ceph_mds_request *req;
938 int err = -EROFS;
939 int op;
940
941 if (ceph_snap(dir) == CEPH_SNAPDIR) {
942 /* rmdir .snap/foo is RMSNAP */
943 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
944 op = CEPH_MDS_OP_RMSNAP;
945 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
946 dout("unlink/rmdir dir %p dn %p inode %p\n",
947 dir, dentry, inode);
948 op = d_is_dir(dentry) ?
949 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
950 } else
951 goto out;
952 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
953 if (IS_ERR(req)) {
954 err = PTR_ERR(req);
955 goto out;
956 }
957 req->r_dentry = dget(dentry);
958 req->r_num_caps = 2;
959 req->r_locked_dir = dir;
960 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
961 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
962 req->r_inode_drop = drop_caps_for_unlink(inode);
963 err = ceph_mdsc_do_request(mdsc, dir, req);
964 if (!err && !req->r_reply_info.head->is_dentry)
965 d_delete(dentry);
966 ceph_mdsc_put_request(req);
967 out:
968 return err;
969 }
970
971 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
972 struct inode *new_dir, struct dentry *new_dentry)
973 {
974 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
975 struct ceph_mds_client *mdsc = fsc->mdsc;
976 struct ceph_mds_request *req;
977 int op = CEPH_MDS_OP_RENAME;
978 int err;
979
980 if (ceph_snap(old_dir) != ceph_snap(new_dir))
981 return -EXDEV;
982 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
983 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
984 op = CEPH_MDS_OP_RENAMESNAP;
985 else
986 return -EROFS;
987 }
988 dout("rename dir %p dentry %p to dir %p dentry %p\n",
989 old_dir, old_dentry, new_dir, new_dentry);
990 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
991 if (IS_ERR(req))
992 return PTR_ERR(req);
993 ihold(old_dir);
994 req->r_dentry = dget(new_dentry);
995 req->r_num_caps = 2;
996 req->r_old_dentry = dget(old_dentry);
997 req->r_old_dentry_dir = old_dir;
998 req->r_locked_dir = new_dir;
999 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1000 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1001 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1002 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1003 /* release LINK_RDCACHE on source inode (mds will lock it) */
1004 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
1005 if (d_really_is_positive(new_dentry))
1006 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
1007 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1008 if (!err && !req->r_reply_info.head->is_dentry) {
1009 /*
1010 * Normally d_move() is done by fill_trace (called by
1011 * do_request, above). If there is no trace, we need
1012 * to do it here.
1013 */
1014
1015 /* d_move screws up sibling dentries' offsets */
1016 ceph_dir_clear_complete(old_dir);
1017 ceph_dir_clear_complete(new_dir);
1018
1019 d_move(old_dentry, new_dentry);
1020
1021 /* ensure target dentry is invalidated, despite
1022 rehashing bug in vfs_rename_dir */
1023 ceph_invalidate_dentry_lease(new_dentry);
1024 }
1025 ceph_mdsc_put_request(req);
1026 return err;
1027 }
1028
1029 /*
1030 * Ensure a dentry lease will no longer revalidate.
1031 */
1032 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1033 {
1034 spin_lock(&dentry->d_lock);
1035 dentry->d_time = jiffies;
1036 ceph_dentry(dentry)->lease_shared_gen = 0;
1037 spin_unlock(&dentry->d_lock);
1038 }
1039
1040 /*
1041 * Check if dentry lease is valid. If not, delete the lease. Try to
1042 * renew if the least is more than half up.
1043 */
1044 static int dentry_lease_is_valid(struct dentry *dentry)
1045 {
1046 struct ceph_dentry_info *di;
1047 struct ceph_mds_session *s;
1048 int valid = 0;
1049 u32 gen;
1050 unsigned long ttl;
1051 struct ceph_mds_session *session = NULL;
1052 struct inode *dir = NULL;
1053 u32 seq = 0;
1054
1055 spin_lock(&dentry->d_lock);
1056 di = ceph_dentry(dentry);
1057 if (di->lease_session) {
1058 s = di->lease_session;
1059 spin_lock(&s->s_gen_ttl_lock);
1060 gen = s->s_cap_gen;
1061 ttl = s->s_cap_ttl;
1062 spin_unlock(&s->s_gen_ttl_lock);
1063
1064 if (di->lease_gen == gen &&
1065 time_before(jiffies, dentry->d_time) &&
1066 time_before(jiffies, ttl)) {
1067 valid = 1;
1068 if (di->lease_renew_after &&
1069 time_after(jiffies, di->lease_renew_after)) {
1070 /* we should renew */
1071 dir = d_inode(dentry->d_parent);
1072 session = ceph_get_mds_session(s);
1073 seq = di->lease_seq;
1074 di->lease_renew_after = 0;
1075 di->lease_renew_from = jiffies;
1076 }
1077 }
1078 }
1079 spin_unlock(&dentry->d_lock);
1080
1081 if (session) {
1082 ceph_mdsc_lease_send_msg(session, dir, dentry,
1083 CEPH_MDS_LEASE_RENEW, seq);
1084 ceph_put_mds_session(session);
1085 }
1086 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1087 return valid;
1088 }
1089
1090 /*
1091 * Check if directory-wide content lease/cap is valid.
1092 */
1093 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1094 {
1095 struct ceph_inode_info *ci = ceph_inode(dir);
1096 struct ceph_dentry_info *di = ceph_dentry(dentry);
1097 int valid = 0;
1098
1099 spin_lock(&ci->i_ceph_lock);
1100 if (ci->i_shared_gen == di->lease_shared_gen)
1101 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1102 spin_unlock(&ci->i_ceph_lock);
1103 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1104 dir, (unsigned)ci->i_shared_gen, dentry,
1105 (unsigned)di->lease_shared_gen, valid);
1106 return valid;
1107 }
1108
1109 /*
1110 * Check if cached dentry can be trusted.
1111 */
1112 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1113 {
1114 int valid = 0;
1115 struct dentry *parent;
1116 struct inode *dir;
1117
1118 if (flags & LOOKUP_RCU)
1119 return -ECHILD;
1120
1121 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1122 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1123
1124 parent = dget_parent(dentry);
1125 dir = d_inode(parent);
1126
1127 /* always trust cached snapped dentries, snapdir dentry */
1128 if (ceph_snap(dir) != CEPH_NOSNAP) {
1129 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1130 dentry, d_inode(dentry));
1131 valid = 1;
1132 } else if (d_really_is_positive(dentry) &&
1133 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1134 valid = 1;
1135 } else if (dentry_lease_is_valid(dentry) ||
1136 dir_lease_is_valid(dir, dentry)) {
1137 if (d_really_is_positive(dentry))
1138 valid = ceph_is_any_caps(d_inode(dentry));
1139 else
1140 valid = 1;
1141 }
1142
1143 if (!valid) {
1144 struct ceph_mds_client *mdsc =
1145 ceph_sb_to_client(dir->i_sb)->mdsc;
1146 struct ceph_mds_request *req;
1147 int op, mask, err;
1148
1149 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1150 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1151 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1152 if (!IS_ERR(req)) {
1153 req->r_dentry = dget(dentry);
1154 req->r_num_caps = 2;
1155
1156 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1157 if (ceph_security_xattr_wanted(dir))
1158 mask |= CEPH_CAP_XATTR_SHARED;
1159 req->r_args.getattr.mask = mask;
1160
1161 req->r_locked_dir = dir;
1162 err = ceph_mdsc_do_request(mdsc, NULL, req);
1163 if (err == 0 || err == -ENOENT) {
1164 if (dentry == req->r_dentry) {
1165 valid = !d_unhashed(dentry);
1166 } else {
1167 d_invalidate(req->r_dentry);
1168 err = -EAGAIN;
1169 }
1170 }
1171 ceph_mdsc_put_request(req);
1172 dout("d_revalidate %p lookup result=%d\n",
1173 dentry, err);
1174 }
1175 }
1176
1177 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1178 if (valid) {
1179 ceph_dentry_lru_touch(dentry);
1180 } else {
1181 ceph_dir_clear_complete(dir);
1182 }
1183
1184 dput(parent);
1185 return valid;
1186 }
1187
1188 /*
1189 * Release our ceph_dentry_info.
1190 */
1191 static void ceph_d_release(struct dentry *dentry)
1192 {
1193 struct ceph_dentry_info *di = ceph_dentry(dentry);
1194
1195 dout("d_release %p\n", dentry);
1196 ceph_dentry_lru_del(dentry);
1197 if (di->lease_session)
1198 ceph_put_mds_session(di->lease_session);
1199 kmem_cache_free(ceph_dentry_cachep, di);
1200 dentry->d_fsdata = NULL;
1201 }
1202
1203 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1204 unsigned int flags)
1205 {
1206 /*
1207 * Eventually, we'll want to revalidate snapped metadata
1208 * too... probably...
1209 */
1210 return 1;
1211 }
1212
1213 /*
1214 * When the VFS prunes a dentry from the cache, we need to clear the
1215 * complete flag on the parent directory.
1216 *
1217 * Called under dentry->d_lock.
1218 */
1219 static void ceph_d_prune(struct dentry *dentry)
1220 {
1221 dout("ceph_d_prune %p\n", dentry);
1222
1223 /* do we have a valid parent? */
1224 if (IS_ROOT(dentry))
1225 return;
1226
1227 /* if we are not hashed, we don't affect dir's completeness */
1228 if (d_unhashed(dentry))
1229 return;
1230
1231 /*
1232 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1233 * cleared until d_release
1234 */
1235 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1236 }
1237
1238 /*
1239 * read() on a dir. This weird interface hack only works if mounted
1240 * with '-o dirstat'.
1241 */
1242 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1243 loff_t *ppos)
1244 {
1245 struct ceph_file_info *cf = file->private_data;
1246 struct inode *inode = file_inode(file);
1247 struct ceph_inode_info *ci = ceph_inode(inode);
1248 int left;
1249 const int bufsize = 1024;
1250
1251 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1252 return -EISDIR;
1253
1254 if (!cf->dir_info) {
1255 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1256 if (!cf->dir_info)
1257 return -ENOMEM;
1258 cf->dir_info_len =
1259 snprintf(cf->dir_info, bufsize,
1260 "entries: %20lld\n"
1261 " files: %20lld\n"
1262 " subdirs: %20lld\n"
1263 "rentries: %20lld\n"
1264 " rfiles: %20lld\n"
1265 " rsubdirs: %20lld\n"
1266 "rbytes: %20lld\n"
1267 "rctime: %10ld.%09ld\n",
1268 ci->i_files + ci->i_subdirs,
1269 ci->i_files,
1270 ci->i_subdirs,
1271 ci->i_rfiles + ci->i_rsubdirs,
1272 ci->i_rfiles,
1273 ci->i_rsubdirs,
1274 ci->i_rbytes,
1275 (long)ci->i_rctime.tv_sec,
1276 (long)ci->i_rctime.tv_nsec);
1277 }
1278
1279 if (*ppos >= cf->dir_info_len)
1280 return 0;
1281 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1282 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1283 if (left == size)
1284 return -EFAULT;
1285 *ppos += (size - left);
1286 return size - left;
1287 }
1288
1289 /*
1290 * We maintain a private dentry LRU.
1291 *
1292 * FIXME: this needs to be changed to a per-mds lru to be useful.
1293 */
1294 void ceph_dentry_lru_add(struct dentry *dn)
1295 {
1296 struct ceph_dentry_info *di = ceph_dentry(dn);
1297 struct ceph_mds_client *mdsc;
1298
1299 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1300 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1301 spin_lock(&mdsc->dentry_lru_lock);
1302 list_add_tail(&di->lru, &mdsc->dentry_lru);
1303 mdsc->num_dentry++;
1304 spin_unlock(&mdsc->dentry_lru_lock);
1305 }
1306
1307 void ceph_dentry_lru_touch(struct dentry *dn)
1308 {
1309 struct ceph_dentry_info *di = ceph_dentry(dn);
1310 struct ceph_mds_client *mdsc;
1311
1312 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1313 di->offset);
1314 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1315 spin_lock(&mdsc->dentry_lru_lock);
1316 list_move_tail(&di->lru, &mdsc->dentry_lru);
1317 spin_unlock(&mdsc->dentry_lru_lock);
1318 }
1319
1320 void ceph_dentry_lru_del(struct dentry *dn)
1321 {
1322 struct ceph_dentry_info *di = ceph_dentry(dn);
1323 struct ceph_mds_client *mdsc;
1324
1325 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1326 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1327 spin_lock(&mdsc->dentry_lru_lock);
1328 list_del_init(&di->lru);
1329 mdsc->num_dentry--;
1330 spin_unlock(&mdsc->dentry_lru_lock);
1331 }
1332
1333 /*
1334 * Return name hash for a given dentry. This is dependent on
1335 * the parent directory's hash function.
1336 */
1337 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1338 {
1339 struct ceph_inode_info *dci = ceph_inode(dir);
1340
1341 switch (dci->i_dir_layout.dl_dir_hash) {
1342 case 0: /* for backward compat */
1343 case CEPH_STR_HASH_LINUX:
1344 return dn->d_name.hash;
1345
1346 default:
1347 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1348 dn->d_name.name, dn->d_name.len);
1349 }
1350 }
1351
1352 const struct file_operations ceph_dir_fops = {
1353 .read = ceph_read_dir,
1354 .iterate = ceph_readdir,
1355 .llseek = ceph_dir_llseek,
1356 .open = ceph_open,
1357 .release = ceph_release,
1358 .unlocked_ioctl = ceph_ioctl,
1359 .fsync = ceph_fsync,
1360 };
1361
1362 const struct file_operations ceph_snapdir_fops = {
1363 .iterate = ceph_readdir,
1364 .llseek = ceph_dir_llseek,
1365 .open = ceph_open,
1366 .release = ceph_release,
1367 };
1368
1369 const struct inode_operations ceph_dir_iops = {
1370 .lookup = ceph_lookup,
1371 .permission = ceph_permission,
1372 .getattr = ceph_getattr,
1373 .setattr = ceph_setattr,
1374 .setxattr = ceph_setxattr,
1375 .getxattr = ceph_getxattr,
1376 .listxattr = ceph_listxattr,
1377 .removexattr = ceph_removexattr,
1378 .get_acl = ceph_get_acl,
1379 .set_acl = ceph_set_acl,
1380 .mknod = ceph_mknod,
1381 .symlink = ceph_symlink,
1382 .mkdir = ceph_mkdir,
1383 .link = ceph_link,
1384 .unlink = ceph_unlink,
1385 .rmdir = ceph_unlink,
1386 .rename = ceph_rename,
1387 .create = ceph_create,
1388 .atomic_open = ceph_atomic_open,
1389 };
1390
1391 const struct inode_operations ceph_snapdir_iops = {
1392 .lookup = ceph_lookup,
1393 .permission = ceph_permission,
1394 .getattr = ceph_getattr,
1395 .mkdir = ceph_mkdir,
1396 .rmdir = ceph_unlink,
1397 .rename = ceph_rename,
1398 };
1399
1400 const struct dentry_operations ceph_dentry_ops = {
1401 .d_revalidate = ceph_d_revalidate,
1402 .d_release = ceph_d_release,
1403 .d_prune = ceph_d_prune,
1404 };
1405
1406 const struct dentry_operations ceph_snapdir_dentry_ops = {
1407 .d_revalidate = ceph_snapdir_d_revalidate,
1408 .d_release = ceph_d_release,
1409 };
1410
1411 const struct dentry_operations ceph_snap_dentry_ops = {
1412 .d_release = ceph_d_release,
1413 .d_prune = ceph_d_prune,
1414 };
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