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Merge tag 'afs-fixes-20171201' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[linux/fpc-iii.git] / fs / ceph / dir.c
blob8a5266699b67657b0ea9053a03fe0ed255abb293
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/spinlock.h>
5 #include <linux/fs_struct.h>
6 #include <linux/namei.h>
7 #include <linux/slab.h>
8 #include <linux/sched.h>
9 #include <linux/xattr.h>
10
11 #include "super.h"
12 #include "mds_client.h"
13
14 /*
15 * Directory operations: readdir, lookup, create, link, unlink,
16 * rename, etc.
17 */
18
19 /*
20 * Ceph MDS operations are specified in terms of a base ino and
21 * relative path. Thus, the client can specify an operation on a
22 * specific inode (e.g., a getattr due to fstat(2)), or as a path
23 * relative to, say, the root directory.
24 *
25 * Normally, we limit ourselves to strict inode ops (no path component)
26 * or dentry operations (a single path component relative to an ino). The
27 * exception to this is open_root_dentry(), which will open the mount
28 * point by name.
29 */
30
31 const struct dentry_operations ceph_dentry_ops;
32
33 /*
34 * Initialize ceph dentry state.
35 */
36 static int ceph_d_init(struct dentry *dentry)
37 {
38 struct ceph_dentry_info *di;
39
40 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
41 if (!di)
42 return -ENOMEM; /* oh well */
43
44 di->dentry = dentry;
45 di->lease_session = NULL;
46 di->time = jiffies;
47 dentry->d_fsdata = di;
48 ceph_dentry_lru_add(dentry);
49 return 0;
50 }
51
52 /*
53 * for f_pos for readdir:
54 * - hash order:
55 * (0xff << 52) | ((24 bits hash) << 28) |
56 * (the nth entry has hash collision);
57 * - frag+name order;
58 * ((frag value) << 28) | (the nth entry in frag);
59 */
60 #define OFFSET_BITS 28
61 #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
62 #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
63 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
64 {
65 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
66 if (hash_order)
67 fpos |= HASH_ORDER;
68 return fpos;
69 }
70
71 static bool is_hash_order(loff_t p)
72 {
73 return (p & HASH_ORDER) == HASH_ORDER;
74 }
75
76 static unsigned fpos_frag(loff_t p)
77 {
78 return p >> OFFSET_BITS;
79 }
80
81 static unsigned fpos_hash(loff_t p)
82 {
83 return ceph_frag_value(fpos_frag(p));
84 }
85
86 static unsigned fpos_off(loff_t p)
87 {
88 return p & OFFSET_MASK;
89 }
90
91 static int fpos_cmp(loff_t l, loff_t r)
92 {
93 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
94 if (v)
95 return v;
96 return (int)(fpos_off(l) - fpos_off(r));
97 }
98
99 /*
100 * make note of the last dentry we read, so we can
101 * continue at the same lexicographical point,
102 * regardless of what dir changes take place on the
103 * server.
104 */
105 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
106 int len, unsigned next_offset)
107 {
108 char *buf = kmalloc(len+1, GFP_KERNEL);
109 if (!buf)
110 return -ENOMEM;
111 kfree(fi->last_name);
112 fi->last_name = buf;
113 memcpy(fi->last_name, name, len);
114 fi->last_name[len] = 0;
115 fi->next_offset = next_offset;
116 dout("note_last_dentry '%s'\n", fi->last_name);
117 return 0;
118 }
119
120
121 static struct dentry *
122 __dcache_find_get_entry(struct dentry *parent, u64 idx,
123 struct ceph_readdir_cache_control *cache_ctl)
124 {
125 struct inode *dir = d_inode(parent);
126 struct dentry *dentry;
127 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
128 loff_t ptr_pos = idx * sizeof(struct dentry *);
129 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
130
131 if (ptr_pos >= i_size_read(dir))
132 return NULL;
133
134 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
135 ceph_readdir_cache_release(cache_ctl);
136 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
137 if (!cache_ctl->page) {
138 dout(" page %lu not found\n", ptr_pgoff);
139 return ERR_PTR(-EAGAIN);
140 }
141 /* reading/filling the cache are serialized by
142 i_mutex, no need to use page lock */
143 unlock_page(cache_ctl->page);
144 cache_ctl->dentries = kmap(cache_ctl->page);
145 }
146
147 cache_ctl->index = idx & idx_mask;
148
149 rcu_read_lock();
150 spin_lock(&parent->d_lock);
151 /* check i_size again here, because empty directory can be
152 * marked as complete while not holding the i_mutex. */
153 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
154 dentry = cache_ctl->dentries[cache_ctl->index];
155 else
156 dentry = NULL;
157 spin_unlock(&parent->d_lock);
158 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
159 dentry = NULL;
160 rcu_read_unlock();
161 return dentry ? : ERR_PTR(-EAGAIN);
162 }
163
164 /*
165 * When possible, we try to satisfy a readdir by peeking at the
166 * dcache. We make this work by carefully ordering dentries on
167 * d_child when we initially get results back from the MDS, and
168 * falling back to a "normal" sync readdir if any dentries in the dir
169 * are dropped.
170 *
171 * Complete dir indicates that we have all dentries in the dir. It is
172 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
173 * the MDS if/when the directory is modified).
174 */
175 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
176 u32 shared_gen)
177 {
178 struct ceph_file_info *fi = file->private_data;
179 struct dentry *parent = file->f_path.dentry;
180 struct inode *dir = d_inode(parent);
181 struct dentry *dentry, *last = NULL;
182 struct ceph_dentry_info *di;
183 struct ceph_readdir_cache_control cache_ctl = {};
184 u64 idx = 0;
185 int err = 0;
186
187 dout("__dcache_readdir %p v%u at %llx\n", dir, shared_gen, ctx->pos);
188
189 /* search start position */
190 if (ctx->pos > 2) {
191 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
192 while (count > 0) {
193 u64 step = count >> 1;
194 dentry = __dcache_find_get_entry(parent, idx + step,
195 &cache_ctl);
196 if (!dentry) {
197 /* use linar search */
198 idx = 0;
199 break;
200 }
201 if (IS_ERR(dentry)) {
202 err = PTR_ERR(dentry);
203 goto out;
204 }
205 di = ceph_dentry(dentry);
206 spin_lock(&dentry->d_lock);
207 if (fpos_cmp(di->offset, ctx->pos) < 0) {
208 idx += step + 1;
209 count -= step + 1;
210 } else {
211 count = step;
212 }
213 spin_unlock(&dentry->d_lock);
214 dput(dentry);
215 }
216
217 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
218 }
219
220
221 for (;;) {
222 bool emit_dentry = false;
223 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
224 if (!dentry) {
225 fi->flags |= CEPH_F_ATEND;
226 err = 0;
227 break;
228 }
229 if (IS_ERR(dentry)) {
230 err = PTR_ERR(dentry);
231 goto out;
232 }
233
234 di = ceph_dentry(dentry);
235 spin_lock(&dentry->d_lock);
236 if (di->lease_shared_gen == shared_gen &&
237 d_really_is_positive(dentry) &&
238 fpos_cmp(ctx->pos, di->offset) <= 0) {
239 emit_dentry = true;
240 }
241 spin_unlock(&dentry->d_lock);
242
243 if (emit_dentry) {
244 dout(" %llx dentry %p %pd %p\n", di->offset,
245 dentry, dentry, d_inode(dentry));
246 ctx->pos = di->offset;
247 if (!dir_emit(ctx, dentry->d_name.name,
248 dentry->d_name.len,
249 ceph_translate_ino(dentry->d_sb,
250 d_inode(dentry)->i_ino),
251 d_inode(dentry)->i_mode >> 12)) {
252 dput(dentry);
253 err = 0;
254 break;
255 }
256 ctx->pos++;
257
258 if (last)
259 dput(last);
260 last = dentry;
261 } else {
262 dput(dentry);
263 }
264 }
265 out:
266 ceph_readdir_cache_release(&cache_ctl);
267 if (last) {
268 int ret;
269 di = ceph_dentry(last);
270 ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
271 fpos_off(di->offset) + 1);
272 if (ret < 0)
273 err = ret;
274 dput(last);
275 /* last_name no longer match cache index */
276 if (fi->readdir_cache_idx >= 0) {
277 fi->readdir_cache_idx = -1;
278 fi->dir_release_count = 0;
279 }
280 }
281 return err;
282 }
283
284 static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos)
285 {
286 if (!fi->last_readdir)
287 return true;
288 if (is_hash_order(pos))
289 return !ceph_frag_contains_value(fi->frag, fpos_hash(pos));
290 else
291 return fi->frag != fpos_frag(pos);
292 }
293
294 static int ceph_readdir(struct file *file, struct dir_context *ctx)
295 {
296 struct ceph_file_info *fi = file->private_data;
297 struct inode *inode = file_inode(file);
298 struct ceph_inode_info *ci = ceph_inode(inode);
299 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
300 struct ceph_mds_client *mdsc = fsc->mdsc;
301 int i;
302 int err;
303 unsigned frag = -1;
304 struct ceph_mds_reply_info_parsed *rinfo;
305
306 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
307 if (fi->flags & CEPH_F_ATEND)
308 return 0;
309
310 /* always start with . and .. */
311 if (ctx->pos == 0) {
312 dout("readdir off 0 -> '.'\n");
313 if (!dir_emit(ctx, ".", 1,
314 ceph_translate_ino(inode->i_sb, inode->i_ino),
315 inode->i_mode >> 12))
316 return 0;
317 ctx->pos = 1;
318 }
319 if (ctx->pos == 1) {
320 ino_t ino = parent_ino(file->f_path.dentry);
321 dout("readdir off 1 -> '..'\n");
322 if (!dir_emit(ctx, "..", 2,
323 ceph_translate_ino(inode->i_sb, ino),
324 inode->i_mode >> 12))
325 return 0;
326 ctx->pos = 2;
327 }
328
329 /* can we use the dcache? */
330 spin_lock(&ci->i_ceph_lock);
331 if (ceph_test_mount_opt(fsc, DCACHE) &&
332 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
333 ceph_snap(inode) != CEPH_SNAPDIR &&
334 __ceph_dir_is_complete_ordered(ci) &&
335 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
336 u32 shared_gen = ci->i_shared_gen;
337 spin_unlock(&ci->i_ceph_lock);
338 err = __dcache_readdir(file, ctx, shared_gen);
339 if (err != -EAGAIN)
340 return err;
341 } else {
342 spin_unlock(&ci->i_ceph_lock);
343 }
344
345 /* proceed with a normal readdir */
346 more:
347 /* do we have the correct frag content buffered? */
348 if (need_send_readdir(fi, ctx->pos)) {
349 struct ceph_mds_request *req;
350 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
351 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
352
353 /* discard old result, if any */
354 if (fi->last_readdir) {
355 ceph_mdsc_put_request(fi->last_readdir);
356 fi->last_readdir = NULL;
357 }
358
359 if (is_hash_order(ctx->pos)) {
360 /* fragtree isn't always accurate. choose frag
361 * based on previous reply when possible. */
362 if (frag == (unsigned)-1)
363 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
364 NULL, NULL);
365 } else {
366 frag = fpos_frag(ctx->pos);
367 }
368
369 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
370 ceph_vinop(inode), frag, fi->last_name);
371 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
372 if (IS_ERR(req))
373 return PTR_ERR(req);
374 err = ceph_alloc_readdir_reply_buffer(req, inode);
375 if (err) {
376 ceph_mdsc_put_request(req);
377 return err;
378 }
379 /* hints to request -> mds selection code */
380 req->r_direct_mode = USE_AUTH_MDS;
381 if (op == CEPH_MDS_OP_READDIR) {
382 req->r_direct_hash = ceph_frag_value(frag);
383 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
384 }
385 if (fi->last_name) {
386 req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
387 if (!req->r_path2) {
388 ceph_mdsc_put_request(req);
389 return -ENOMEM;
390 }
391 } else if (is_hash_order(ctx->pos)) {
392 req->r_args.readdir.offset_hash =
393 cpu_to_le32(fpos_hash(ctx->pos));
394 }
395
396 req->r_dir_release_cnt = fi->dir_release_count;
397 req->r_dir_ordered_cnt = fi->dir_ordered_count;
398 req->r_readdir_cache_idx = fi->readdir_cache_idx;
399 req->r_readdir_offset = fi->next_offset;
400 req->r_args.readdir.frag = cpu_to_le32(frag);
401 req->r_args.readdir.flags =
402 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
403
404 req->r_inode = inode;
405 ihold(inode);
406 req->r_dentry = dget(file->f_path.dentry);
407 err = ceph_mdsc_do_request(mdsc, NULL, req);
408 if (err < 0) {
409 ceph_mdsc_put_request(req);
410 return err;
411 }
412 dout("readdir got and parsed readdir result=%d on "
413 "frag %x, end=%d, complete=%d, hash_order=%d\n",
414 err, frag,
415 (int)req->r_reply_info.dir_end,
416 (int)req->r_reply_info.dir_complete,
417 (int)req->r_reply_info.hash_order);
418
419 rinfo = &req->r_reply_info;
420 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
421 frag = le32_to_cpu(rinfo->dir_dir->frag);
422 if (!rinfo->hash_order) {
423 fi->next_offset = req->r_readdir_offset;
424 /* adjust ctx->pos to beginning of frag */
425 ctx->pos = ceph_make_fpos(frag,
426 fi->next_offset,
427 false);
428 }
429 }
430
431 fi->frag = frag;
432 fi->last_readdir = req;
433
434 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
435 fi->readdir_cache_idx = req->r_readdir_cache_idx;
436 if (fi->readdir_cache_idx < 0) {
437 /* preclude from marking dir ordered */
438 fi->dir_ordered_count = 0;
439 } else if (ceph_frag_is_leftmost(frag) &&
440 fi->next_offset == 2) {
441 /* note dir version at start of readdir so
442 * we can tell if any dentries get dropped */
443 fi->dir_release_count = req->r_dir_release_cnt;
444 fi->dir_ordered_count = req->r_dir_ordered_cnt;
445 }
446 } else {
447 dout("readdir !did_prepopulate");
448 /* disable readdir cache */
449 fi->readdir_cache_idx = -1;
450 /* preclude from marking dir complete */
451 fi->dir_release_count = 0;
452 }
453
454 /* note next offset and last dentry name */
455 if (rinfo->dir_nr > 0) {
456 struct ceph_mds_reply_dir_entry *rde =
457 rinfo->dir_entries + (rinfo->dir_nr-1);
458 unsigned next_offset = req->r_reply_info.dir_end ?
459 2 : (fpos_off(rde->offset) + 1);
460 err = note_last_dentry(fi, rde->name, rde->name_len,
461 next_offset);
462 if (err)
463 return err;
464 } else if (req->r_reply_info.dir_end) {
465 fi->next_offset = 2;
466 /* keep last name */
467 }
468 }
469
470 rinfo = &fi->last_readdir->r_reply_info;
471 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
472 fi->frag, rinfo->dir_nr, ctx->pos,
473 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
474
475 i = 0;
476 /* search start position */
477 if (rinfo->dir_nr > 0) {
478 int step, nr = rinfo->dir_nr;
479 while (nr > 0) {
480 step = nr >> 1;
481 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
482 i += step + 1;
483 nr -= step + 1;
484 } else {
485 nr = step;
486 }
487 }
488 }
489 for (; i < rinfo->dir_nr; i++) {
490 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
491 struct ceph_vino vino;
492 ino_t ino;
493 u32 ftype;
494
495 BUG_ON(rde->offset < ctx->pos);
496
497 ctx->pos = rde->offset;
498 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
499 i, rinfo->dir_nr, ctx->pos,
500 rde->name_len, rde->name, &rde->inode.in);
501
502 BUG_ON(!rde->inode.in);
503 ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
504 vino.ino = le64_to_cpu(rde->inode.in->ino);
505 vino.snap = le64_to_cpu(rde->inode.in->snapid);
506 ino = ceph_vino_to_ino(vino);
507
508 if (!dir_emit(ctx, rde->name, rde->name_len,
509 ceph_translate_ino(inode->i_sb, ino), ftype)) {
510 dout("filldir stopping us...\n");
511 return 0;
512 }
513 ctx->pos++;
514 }
515
516 ceph_mdsc_put_request(fi->last_readdir);
517 fi->last_readdir = NULL;
518
519 if (fi->next_offset > 2) {
520 frag = fi->frag;
521 goto more;
522 }
523
524 /* more frags? */
525 if (!ceph_frag_is_rightmost(fi->frag)) {
526 frag = ceph_frag_next(fi->frag);
527 if (is_hash_order(ctx->pos)) {
528 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
529 fi->next_offset, true);
530 if (new_pos > ctx->pos)
531 ctx->pos = new_pos;
532 /* keep last_name */
533 } else {
534 ctx->pos = ceph_make_fpos(frag, fi->next_offset, false);
535 kfree(fi->last_name);
536 fi->last_name = NULL;
537 }
538 dout("readdir next frag is %x\n", frag);
539 goto more;
540 }
541 fi->flags |= CEPH_F_ATEND;
542
543 /*
544 * if dir_release_count still matches the dir, no dentries
545 * were released during the whole readdir, and we should have
546 * the complete dir contents in our cache.
547 */
548 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
549 spin_lock(&ci->i_ceph_lock);
550 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
551 dout(" marking %p complete and ordered\n", inode);
552 /* use i_size to track number of entries in
553 * readdir cache */
554 BUG_ON(fi->readdir_cache_idx < 0);
555 i_size_write(inode, fi->readdir_cache_idx *
556 sizeof(struct dentry*));
557 } else {
558 dout(" marking %p complete\n", inode);
559 }
560 __ceph_dir_set_complete(ci, fi->dir_release_count,
561 fi->dir_ordered_count);
562 spin_unlock(&ci->i_ceph_lock);
563 }
564
565 dout("readdir %p file %p done.\n", inode, file);
566 return 0;
567 }
568
569 static void reset_readdir(struct ceph_file_info *fi)
570 {
571 if (fi->last_readdir) {
572 ceph_mdsc_put_request(fi->last_readdir);
573 fi->last_readdir = NULL;
574 }
575 kfree(fi->last_name);
576 fi->last_name = NULL;
577 fi->dir_release_count = 0;
578 fi->readdir_cache_idx = -1;
579 fi->next_offset = 2; /* compensate for . and .. */
580 fi->flags &= ~CEPH_F_ATEND;
581 }
582
583 /*
584 * discard buffered readdir content on seekdir(0), or seek to new frag,
585 * or seek prior to current chunk
586 */
587 static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos)
588 {
589 struct ceph_mds_reply_info_parsed *rinfo;
590 loff_t chunk_offset;
591 if (new_pos == 0)
592 return true;
593 if (is_hash_order(new_pos)) {
594 /* no need to reset last_name for a forward seek when
595 * dentries are sotred in hash order */
596 } else if (fi->frag != fpos_frag(new_pos)) {
597 return true;
598 }
599 rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL;
600 if (!rinfo || !rinfo->dir_nr)
601 return true;
602 chunk_offset = rinfo->dir_entries[0].offset;
603 return new_pos < chunk_offset ||
604 is_hash_order(new_pos) != is_hash_order(chunk_offset);
605 }
606
607 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
608 {
609 struct ceph_file_info *fi = file->private_data;
610 struct inode *inode = file->f_mapping->host;
611 loff_t retval;
612
613 inode_lock(inode);
614 retval = -EINVAL;
615 switch (whence) {
616 case SEEK_CUR:
617 offset += file->f_pos;
618 case SEEK_SET:
619 break;
620 case SEEK_END:
621 retval = -EOPNOTSUPP;
622 default:
623 goto out;
624 }
625
626 if (offset >= 0) {
627 if (need_reset_readdir(fi, offset)) {
628 dout("dir_llseek dropping %p content\n", file);
629 reset_readdir(fi);
630 } else if (is_hash_order(offset) && offset > file->f_pos) {
631 /* for hash offset, we don't know if a forward seek
632 * is within same frag */
633 fi->dir_release_count = 0;
634 fi->readdir_cache_idx = -1;
635 }
636
637 if (offset != file->f_pos) {
638 file->f_pos = offset;
639 file->f_version = 0;
640 fi->flags &= ~CEPH_F_ATEND;
641 }
642 retval = offset;
643 }
644 out:
645 inode_unlock(inode);
646 return retval;
647 }
648
649 /*
650 * Handle lookups for the hidden .snap directory.
651 */
652 int ceph_handle_snapdir(struct ceph_mds_request *req,
653 struct dentry *dentry, int err)
654 {
655 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
656 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
657
658 /* .snap dir? */
659 if (err == -ENOENT &&
660 ceph_snap(parent) == CEPH_NOSNAP &&
661 strcmp(dentry->d_name.name,
662 fsc->mount_options->snapdir_name) == 0) {
663 struct inode *inode = ceph_get_snapdir(parent);
664 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
665 dentry, dentry, inode);
666 BUG_ON(!d_unhashed(dentry));
667 d_add(dentry, inode);
668 err = 0;
669 }
670 return err;
671 }
672
673 /*
674 * Figure out final result of a lookup/open request.
675 *
676 * Mainly, make sure we return the final req->r_dentry (if it already
677 * existed) in place of the original VFS-provided dentry when they
678 * differ.
679 *
680 * Gracefully handle the case where the MDS replies with -ENOENT and
681 * no trace (which it may do, at its discretion, e.g., if it doesn't
682 * care to issue a lease on the negative dentry).
683 */
684 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
685 struct dentry *dentry, int err)
686 {
687 if (err == -ENOENT) {
688 /* no trace? */
689 err = 0;
690 if (!req->r_reply_info.head->is_dentry) {
691 dout("ENOENT and no trace, dentry %p inode %p\n",
692 dentry, d_inode(dentry));
693 if (d_really_is_positive(dentry)) {
694 d_drop(dentry);
695 err = -ENOENT;
696 } else {
697 d_add(dentry, NULL);
698 }
699 }
700 }
701 if (err)
702 dentry = ERR_PTR(err);
703 else if (dentry != req->r_dentry)
704 dentry = dget(req->r_dentry); /* we got spliced */
705 else
706 dentry = NULL;
707 return dentry;
708 }
709
710 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
711 {
712 return ceph_ino(inode) == CEPH_INO_ROOT &&
713 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
714 }
715
716 /*
717 * Look up a single dir entry. If there is a lookup intent, inform
718 * the MDS so that it gets our 'caps wanted' value in a single op.
719 */
720 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
721 unsigned int flags)
722 {
723 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
724 struct ceph_mds_client *mdsc = fsc->mdsc;
725 struct ceph_mds_request *req;
726 int op;
727 int mask;
728 int err;
729
730 dout("lookup %p dentry %p '%pd'\n",
731 dir, dentry, dentry);
732
733 if (dentry->d_name.len > NAME_MAX)
734 return ERR_PTR(-ENAMETOOLONG);
735
736 /* can we conclude ENOENT locally? */
737 if (d_really_is_negative(dentry)) {
738 struct ceph_inode_info *ci = ceph_inode(dir);
739 struct ceph_dentry_info *di = ceph_dentry(dentry);
740
741 spin_lock(&ci->i_ceph_lock);
742 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
743 if (strncmp(dentry->d_name.name,
744 fsc->mount_options->snapdir_name,
745 dentry->d_name.len) &&
746 !is_root_ceph_dentry(dir, dentry) &&
747 ceph_test_mount_opt(fsc, DCACHE) &&
748 __ceph_dir_is_complete(ci) &&
749 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
750 spin_unlock(&ci->i_ceph_lock);
751 dout(" dir %p complete, -ENOENT\n", dir);
752 d_add(dentry, NULL);
753 di->lease_shared_gen = ci->i_shared_gen;
754 return NULL;
755 }
756 spin_unlock(&ci->i_ceph_lock);
757 }
758
759 op = ceph_snap(dir) == CEPH_SNAPDIR ?
760 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
761 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
762 if (IS_ERR(req))
763 return ERR_CAST(req);
764 req->r_dentry = dget(dentry);
765 req->r_num_caps = 2;
766
767 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
768 if (ceph_security_xattr_wanted(dir))
769 mask |= CEPH_CAP_XATTR_SHARED;
770 req->r_args.getattr.mask = cpu_to_le32(mask);
771
772 req->r_parent = dir;
773 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
774 err = ceph_mdsc_do_request(mdsc, NULL, req);
775 err = ceph_handle_snapdir(req, dentry, err);
776 dentry = ceph_finish_lookup(req, dentry, err);
777 ceph_mdsc_put_request(req); /* will dput(dentry) */
778 dout("lookup result=%p\n", dentry);
779 return dentry;
780 }
781
782 /*
783 * If we do a create but get no trace back from the MDS, follow up with
784 * a lookup (the VFS expects us to link up the provided dentry).
785 */
786 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
787 {
788 struct dentry *result = ceph_lookup(dir, dentry, 0);
789
790 if (result && !IS_ERR(result)) {
791 /*
792 * We created the item, then did a lookup, and found
793 * it was already linked to another inode we already
794 * had in our cache (and thus got spliced). To not
795 * confuse VFS (especially when inode is a directory),
796 * we don't link our dentry to that inode, return an
797 * error instead.
798 *
799 * This event should be rare and it happens only when
800 * we talk to old MDS. Recent MDS does not send traceless
801 * reply for request that creates new inode.
802 */
803 d_drop(result);
804 return -ESTALE;
805 }
806 return PTR_ERR(result);
807 }
808
809 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
810 umode_t mode, dev_t rdev)
811 {
812 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
813 struct ceph_mds_client *mdsc = fsc->mdsc;
814 struct ceph_mds_request *req;
815 struct ceph_acls_info acls = {};
816 int err;
817
818 if (ceph_snap(dir) != CEPH_NOSNAP)
819 return -EROFS;
820
821 err = ceph_pre_init_acls(dir, &mode, &acls);
822 if (err < 0)
823 return err;
824
825 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
826 dir, dentry, mode, rdev);
827 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
828 if (IS_ERR(req)) {
829 err = PTR_ERR(req);
830 goto out;
831 }
832 req->r_dentry = dget(dentry);
833 req->r_num_caps = 2;
834 req->r_parent = dir;
835 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
836 req->r_args.mknod.mode = cpu_to_le32(mode);
837 req->r_args.mknod.rdev = cpu_to_le32(rdev);
838 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
839 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
840 if (acls.pagelist) {
841 req->r_pagelist = acls.pagelist;
842 acls.pagelist = NULL;
843 }
844 err = ceph_mdsc_do_request(mdsc, dir, req);
845 if (!err && !req->r_reply_info.head->is_dentry)
846 err = ceph_handle_notrace_create(dir, dentry);
847 ceph_mdsc_put_request(req);
848 out:
849 if (!err)
850 ceph_init_inode_acls(d_inode(dentry), &acls);
851 else
852 d_drop(dentry);
853 ceph_release_acls_info(&acls);
854 return err;
855 }
856
857 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
858 bool excl)
859 {
860 return ceph_mknod(dir, dentry, mode, 0);
861 }
862
863 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
864 const char *dest)
865 {
866 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
867 struct ceph_mds_client *mdsc = fsc->mdsc;
868 struct ceph_mds_request *req;
869 int err;
870
871 if (ceph_snap(dir) != CEPH_NOSNAP)
872 return -EROFS;
873
874 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
875 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
876 if (IS_ERR(req)) {
877 err = PTR_ERR(req);
878 goto out;
879 }
880 req->r_path2 = kstrdup(dest, GFP_KERNEL);
881 if (!req->r_path2) {
882 err = -ENOMEM;
883 ceph_mdsc_put_request(req);
884 goto out;
885 }
886 req->r_parent = dir;
887 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
888 req->r_dentry = dget(dentry);
889 req->r_num_caps = 2;
890 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
891 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
892 err = ceph_mdsc_do_request(mdsc, dir, req);
893 if (!err && !req->r_reply_info.head->is_dentry)
894 err = ceph_handle_notrace_create(dir, dentry);
895 ceph_mdsc_put_request(req);
896 out:
897 if (err)
898 d_drop(dentry);
899 return err;
900 }
901
902 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
903 {
904 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
905 struct ceph_mds_client *mdsc = fsc->mdsc;
906 struct ceph_mds_request *req;
907 struct ceph_acls_info acls = {};
908 int err = -EROFS;
909 int op;
910
911 if (ceph_snap(dir) == CEPH_SNAPDIR) {
912 /* mkdir .snap/foo is a MKSNAP */
913 op = CEPH_MDS_OP_MKSNAP;
914 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
915 dentry, dentry);
916 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
917 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
918 op = CEPH_MDS_OP_MKDIR;
919 } else {
920 goto out;
921 }
922
923 mode |= S_IFDIR;
924 err = ceph_pre_init_acls(dir, &mode, &acls);
925 if (err < 0)
926 goto out;
927
928 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
929 if (IS_ERR(req)) {
930 err = PTR_ERR(req);
931 goto out;
932 }
933
934 req->r_dentry = dget(dentry);
935 req->r_num_caps = 2;
936 req->r_parent = dir;
937 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
938 req->r_args.mkdir.mode = cpu_to_le32(mode);
939 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
940 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
941 if (acls.pagelist) {
942 req->r_pagelist = acls.pagelist;
943 acls.pagelist = NULL;
944 }
945 err = ceph_mdsc_do_request(mdsc, dir, req);
946 if (!err &&
947 !req->r_reply_info.head->is_target &&
948 !req->r_reply_info.head->is_dentry)
949 err = ceph_handle_notrace_create(dir, dentry);
950 ceph_mdsc_put_request(req);
951 out:
952 if (!err)
953 ceph_init_inode_acls(d_inode(dentry), &acls);
954 else
955 d_drop(dentry);
956 ceph_release_acls_info(&acls);
957 return err;
958 }
959
960 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
961 struct dentry *dentry)
962 {
963 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
964 struct ceph_mds_client *mdsc = fsc->mdsc;
965 struct ceph_mds_request *req;
966 int err;
967
968 if (ceph_snap(dir) != CEPH_NOSNAP)
969 return -EROFS;
970
971 dout("link in dir %p old_dentry %p dentry %p\n", dir,
972 old_dentry, dentry);
973 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
974 if (IS_ERR(req)) {
975 d_drop(dentry);
976 return PTR_ERR(req);
977 }
978 req->r_dentry = dget(dentry);
979 req->r_num_caps = 2;
980 req->r_old_dentry = dget(old_dentry);
981 req->r_parent = dir;
982 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
983 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
984 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
985 /* release LINK_SHARED on source inode (mds will lock it) */
986 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
987 err = ceph_mdsc_do_request(mdsc, dir, req);
988 if (err) {
989 d_drop(dentry);
990 } else if (!req->r_reply_info.head->is_dentry) {
991 ihold(d_inode(old_dentry));
992 d_instantiate(dentry, d_inode(old_dentry));
993 }
994 ceph_mdsc_put_request(req);
995 return err;
996 }
997
998 /*
999 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
1000 * looks like the link count will hit 0, drop any other caps (other
1001 * than PIN) we don't specifically want (due to the file still being
1002 * open).
1003 */
1004 static int drop_caps_for_unlink(struct inode *inode)
1005 {
1006 struct ceph_inode_info *ci = ceph_inode(inode);
1007 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1008
1009 spin_lock(&ci->i_ceph_lock);
1010 if (inode->i_nlink == 1) {
1011 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
1012 ci->i_ceph_flags |= CEPH_I_NODELAY;
1013 }
1014 spin_unlock(&ci->i_ceph_lock);
1015 return drop;
1016 }
1017
1018 /*
1019 * rmdir and unlink are differ only by the metadata op code
1020 */
1021 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1022 {
1023 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1024 struct ceph_mds_client *mdsc = fsc->mdsc;
1025 struct inode *inode = d_inode(dentry);
1026 struct ceph_mds_request *req;
1027 int err = -EROFS;
1028 int op;
1029
1030 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1031 /* rmdir .snap/foo is RMSNAP */
1032 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1033 op = CEPH_MDS_OP_RMSNAP;
1034 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1035 dout("unlink/rmdir dir %p dn %p inode %p\n",
1036 dir, dentry, inode);
1037 op = d_is_dir(dentry) ?
1038 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1039 } else
1040 goto out;
1041 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1042 if (IS_ERR(req)) {
1043 err = PTR_ERR(req);
1044 goto out;
1045 }
1046 req->r_dentry = dget(dentry);
1047 req->r_num_caps = 2;
1048 req->r_parent = dir;
1049 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1050 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1051 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1052 req->r_inode_drop = drop_caps_for_unlink(inode);
1053 err = ceph_mdsc_do_request(mdsc, dir, req);
1054 if (!err && !req->r_reply_info.head->is_dentry)
1055 d_delete(dentry);
1056 ceph_mdsc_put_request(req);
1057 out:
1058 return err;
1059 }
1060
1061 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1062 struct inode *new_dir, struct dentry *new_dentry,
1063 unsigned int flags)
1064 {
1065 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1066 struct ceph_mds_client *mdsc = fsc->mdsc;
1067 struct ceph_mds_request *req;
1068 int op = CEPH_MDS_OP_RENAME;
1069 int err;
1070
1071 if (flags)
1072 return -EINVAL;
1073
1074 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1075 return -EXDEV;
1076 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1077 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1078 op = CEPH_MDS_OP_RENAMESNAP;
1079 else
1080 return -EROFS;
1081 }
1082 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1083 old_dir, old_dentry, new_dir, new_dentry);
1084 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1085 if (IS_ERR(req))
1086 return PTR_ERR(req);
1087 ihold(old_dir);
1088 req->r_dentry = dget(new_dentry);
1089 req->r_num_caps = 2;
1090 req->r_old_dentry = dget(old_dentry);
1091 req->r_old_dentry_dir = old_dir;
1092 req->r_parent = new_dir;
1093 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1094 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1095 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1096 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1097 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1098 /* release LINK_RDCACHE on source inode (mds will lock it) */
1099 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
1100 if (d_really_is_positive(new_dentry))
1101 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
1102 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1103 if (!err && !req->r_reply_info.head->is_dentry) {
1104 /*
1105 * Normally d_move() is done by fill_trace (called by
1106 * do_request, above). If there is no trace, we need
1107 * to do it here.
1108 */
1109
1110 /* d_move screws up sibling dentries' offsets */
1111 ceph_dir_clear_complete(old_dir);
1112 ceph_dir_clear_complete(new_dir);
1113
1114 d_move(old_dentry, new_dentry);
1115
1116 /* ensure target dentry is invalidated, despite
1117 rehashing bug in vfs_rename_dir */
1118 ceph_invalidate_dentry_lease(new_dentry);
1119 }
1120 ceph_mdsc_put_request(req);
1121 return err;
1122 }
1123
1124 /*
1125 * Ensure a dentry lease will no longer revalidate.
1126 */
1127 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1128 {
1129 spin_lock(&dentry->d_lock);
1130 ceph_dentry(dentry)->time = jiffies;
1131 ceph_dentry(dentry)->lease_shared_gen = 0;
1132 spin_unlock(&dentry->d_lock);
1133 }
1134
1135 /*
1136 * Check if dentry lease is valid. If not, delete the lease. Try to
1137 * renew if the least is more than half up.
1138 */
1139 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags,
1140 struct inode *dir)
1141 {
1142 struct ceph_dentry_info *di;
1143 struct ceph_mds_session *s;
1144 int valid = 0;
1145 u32 gen;
1146 unsigned long ttl;
1147 struct ceph_mds_session *session = NULL;
1148 u32 seq = 0;
1149
1150 spin_lock(&dentry->d_lock);
1151 di = ceph_dentry(dentry);
1152 if (di && di->lease_session) {
1153 s = di->lease_session;
1154 spin_lock(&s->s_gen_ttl_lock);
1155 gen = s->s_cap_gen;
1156 ttl = s->s_cap_ttl;
1157 spin_unlock(&s->s_gen_ttl_lock);
1158
1159 if (di->lease_gen == gen &&
1160 time_before(jiffies, di->time) &&
1161 time_before(jiffies, ttl)) {
1162 valid = 1;
1163 if (di->lease_renew_after &&
1164 time_after(jiffies, di->lease_renew_after)) {
1165 /*
1166 * We should renew. If we're in RCU walk mode
1167 * though, we can't do that so just return
1168 * -ECHILD.
1169 */
1170 if (flags & LOOKUP_RCU) {
1171 valid = -ECHILD;
1172 } else {
1173 session = ceph_get_mds_session(s);
1174 seq = di->lease_seq;
1175 di->lease_renew_after = 0;
1176 di->lease_renew_from = jiffies;
1177 }
1178 }
1179 }
1180 }
1181 spin_unlock(&dentry->d_lock);
1182
1183 if (session) {
1184 ceph_mdsc_lease_send_msg(session, dir, dentry,
1185 CEPH_MDS_LEASE_RENEW, seq);
1186 ceph_put_mds_session(session);
1187 }
1188 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1189 return valid;
1190 }
1191
1192 /*
1193 * Check if directory-wide content lease/cap is valid.
1194 */
1195 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1196 {
1197 struct ceph_inode_info *ci = ceph_inode(dir);
1198 struct ceph_dentry_info *di = ceph_dentry(dentry);
1199 int valid = 0;
1200
1201 spin_lock(&ci->i_ceph_lock);
1202 if (ci->i_shared_gen == di->lease_shared_gen)
1203 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1204 spin_unlock(&ci->i_ceph_lock);
1205 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1206 dir, (unsigned)ci->i_shared_gen, dentry,
1207 (unsigned)di->lease_shared_gen, valid);
1208 return valid;
1209 }
1210
1211 /*
1212 * Check if cached dentry can be trusted.
1213 */
1214 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1215 {
1216 int valid = 0;
1217 struct dentry *parent;
1218 struct inode *dir;
1219
1220 if (flags & LOOKUP_RCU) {
1221 parent = READ_ONCE(dentry->d_parent);
1222 dir = d_inode_rcu(parent);
1223 if (!dir)
1224 return -ECHILD;
1225 } else {
1226 parent = dget_parent(dentry);
1227 dir = d_inode(parent);
1228 }
1229
1230 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1231 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1232
1233 /* always trust cached snapped dentries, snapdir dentry */
1234 if (ceph_snap(dir) != CEPH_NOSNAP) {
1235 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1236 dentry, d_inode(dentry));
1237 valid = 1;
1238 } else if (d_really_is_positive(dentry) &&
1239 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1240 valid = 1;
1241 } else {
1242 valid = dentry_lease_is_valid(dentry, flags, dir);
1243 if (valid == -ECHILD)
1244 return valid;
1245 if (valid || dir_lease_is_valid(dir, dentry)) {
1246 if (d_really_is_positive(dentry))
1247 valid = ceph_is_any_caps(d_inode(dentry));
1248 else
1249 valid = 1;
1250 }
1251 }
1252
1253 if (!valid) {
1254 struct ceph_mds_client *mdsc =
1255 ceph_sb_to_client(dir->i_sb)->mdsc;
1256 struct ceph_mds_request *req;
1257 int op, err;
1258 u32 mask;
1259
1260 if (flags & LOOKUP_RCU)
1261 return -ECHILD;
1262
1263 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1264 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1265 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1266 if (!IS_ERR(req)) {
1267 req->r_dentry = dget(dentry);
1268 req->r_num_caps = 2;
1269 req->r_parent = dir;
1270
1271 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1272 if (ceph_security_xattr_wanted(dir))
1273 mask |= CEPH_CAP_XATTR_SHARED;
1274 req->r_args.getattr.mask = cpu_to_le32(mask);
1275
1276 err = ceph_mdsc_do_request(mdsc, NULL, req);
1277 switch (err) {
1278 case 0:
1279 if (d_really_is_positive(dentry) &&
1280 d_inode(dentry) == req->r_target_inode)
1281 valid = 1;
1282 break;
1283 case -ENOENT:
1284 if (d_really_is_negative(dentry))
1285 valid = 1;
1286 /* Fallthrough */
1287 default:
1288 break;
1289 }
1290 ceph_mdsc_put_request(req);
1291 dout("d_revalidate %p lookup result=%d\n",
1292 dentry, err);
1293 }
1294 }
1295
1296 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1297 if (valid) {
1298 ceph_dentry_lru_touch(dentry);
1299 } else {
1300 ceph_dir_clear_complete(dir);
1301 }
1302
1303 if (!(flags & LOOKUP_RCU))
1304 dput(parent);
1305 return valid;
1306 }
1307
1308 /*
1309 * Release our ceph_dentry_info.
1310 */
1311 static void ceph_d_release(struct dentry *dentry)
1312 {
1313 struct ceph_dentry_info *di = ceph_dentry(dentry);
1314
1315 dout("d_release %p\n", dentry);
1316 ceph_dentry_lru_del(dentry);
1317
1318 spin_lock(&dentry->d_lock);
1319 dentry->d_fsdata = NULL;
1320 spin_unlock(&dentry->d_lock);
1321
1322 if (di->lease_session)
1323 ceph_put_mds_session(di->lease_session);
1324 kmem_cache_free(ceph_dentry_cachep, di);
1325 }
1326
1327 /*
1328 * When the VFS prunes a dentry from the cache, we need to clear the
1329 * complete flag on the parent directory.
1330 *
1331 * Called under dentry->d_lock.
1332 */
1333 static void ceph_d_prune(struct dentry *dentry)
1334 {
1335 dout("ceph_d_prune %p\n", dentry);
1336
1337 /* do we have a valid parent? */
1338 if (IS_ROOT(dentry))
1339 return;
1340
1341 /* if we are not hashed, we don't affect dir's completeness */
1342 if (d_unhashed(dentry))
1343 return;
1344
1345 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR)
1346 return;
1347
1348 /*
1349 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1350 * cleared until d_release
1351 */
1352 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1353 }
1354
1355 /*
1356 * read() on a dir. This weird interface hack only works if mounted
1357 * with '-o dirstat'.
1358 */
1359 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1360 loff_t *ppos)
1361 {
1362 struct ceph_file_info *cf = file->private_data;
1363 struct inode *inode = file_inode(file);
1364 struct ceph_inode_info *ci = ceph_inode(inode);
1365 int left;
1366 const int bufsize = 1024;
1367
1368 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1369 return -EISDIR;
1370
1371 if (!cf->dir_info) {
1372 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1373 if (!cf->dir_info)
1374 return -ENOMEM;
1375 cf->dir_info_len =
1376 snprintf(cf->dir_info, bufsize,
1377 "entries: %20lld\n"
1378 " files: %20lld\n"
1379 " subdirs: %20lld\n"
1380 "rentries: %20lld\n"
1381 " rfiles: %20lld\n"
1382 " rsubdirs: %20lld\n"
1383 "rbytes: %20lld\n"
1384 "rctime: %10ld.%09ld\n",
1385 ci->i_files + ci->i_subdirs,
1386 ci->i_files,
1387 ci->i_subdirs,
1388 ci->i_rfiles + ci->i_rsubdirs,
1389 ci->i_rfiles,
1390 ci->i_rsubdirs,
1391 ci->i_rbytes,
1392 (long)ci->i_rctime.tv_sec,
1393 (long)ci->i_rctime.tv_nsec);
1394 }
1395
1396 if (*ppos >= cf->dir_info_len)
1397 return 0;
1398 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1399 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1400 if (left == size)
1401 return -EFAULT;
1402 *ppos += (size - left);
1403 return size - left;
1404 }
1405
1406 /*
1407 * We maintain a private dentry LRU.
1408 *
1409 * FIXME: this needs to be changed to a per-mds lru to be useful.
1410 */
1411 void ceph_dentry_lru_add(struct dentry *dn)
1412 {
1413 struct ceph_dentry_info *di = ceph_dentry(dn);
1414 struct ceph_mds_client *mdsc;
1415
1416 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1417 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1418 spin_lock(&mdsc->dentry_lru_lock);
1419 list_add_tail(&di->lru, &mdsc->dentry_lru);
1420 mdsc->num_dentry++;
1421 spin_unlock(&mdsc->dentry_lru_lock);
1422 }
1423
1424 void ceph_dentry_lru_touch(struct dentry *dn)
1425 {
1426 struct ceph_dentry_info *di = ceph_dentry(dn);
1427 struct ceph_mds_client *mdsc;
1428
1429 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1430 di->offset);
1431 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1432 spin_lock(&mdsc->dentry_lru_lock);
1433 list_move_tail(&di->lru, &mdsc->dentry_lru);
1434 spin_unlock(&mdsc->dentry_lru_lock);
1435 }
1436
1437 void ceph_dentry_lru_del(struct dentry *dn)
1438 {
1439 struct ceph_dentry_info *di = ceph_dentry(dn);
1440 struct ceph_mds_client *mdsc;
1441
1442 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1443 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1444 spin_lock(&mdsc->dentry_lru_lock);
1445 list_del_init(&di->lru);
1446 mdsc->num_dentry--;
1447 spin_unlock(&mdsc->dentry_lru_lock);
1448 }
1449
1450 /*
1451 * Return name hash for a given dentry. This is dependent on
1452 * the parent directory's hash function.
1453 */
1454 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1455 {
1456 struct ceph_inode_info *dci = ceph_inode(dir);
1457
1458 switch (dci->i_dir_layout.dl_dir_hash) {
1459 case 0: /* for backward compat */
1460 case CEPH_STR_HASH_LINUX:
1461 return dn->d_name.hash;
1462
1463 default:
1464 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1465 dn->d_name.name, dn->d_name.len);
1466 }
1467 }
1468
1469 const struct file_operations ceph_dir_fops = {
1470 .read = ceph_read_dir,
1471 .iterate = ceph_readdir,
1472 .llseek = ceph_dir_llseek,
1473 .open = ceph_open,
1474 .release = ceph_release,
1475 .unlocked_ioctl = ceph_ioctl,
1476 .fsync = ceph_fsync,
1477 };
1478
1479 const struct file_operations ceph_snapdir_fops = {
1480 .iterate = ceph_readdir,
1481 .llseek = ceph_dir_llseek,
1482 .open = ceph_open,
1483 .release = ceph_release,
1484 };
1485
1486 const struct inode_operations ceph_dir_iops = {
1487 .lookup = ceph_lookup,
1488 .permission = ceph_permission,
1489 .getattr = ceph_getattr,
1490 .setattr = ceph_setattr,
1491 .listxattr = ceph_listxattr,
1492 .get_acl = ceph_get_acl,
1493 .set_acl = ceph_set_acl,
1494 .mknod = ceph_mknod,
1495 .symlink = ceph_symlink,
1496 .mkdir = ceph_mkdir,
1497 .link = ceph_link,
1498 .unlink = ceph_unlink,
1499 .rmdir = ceph_unlink,
1500 .rename = ceph_rename,
1501 .create = ceph_create,
1502 .atomic_open = ceph_atomic_open,
1503 };
1504
1505 const struct inode_operations ceph_snapdir_iops = {
1506 .lookup = ceph_lookup,
1507 .permission = ceph_permission,
1508 .getattr = ceph_getattr,
1509 .mkdir = ceph_mkdir,
1510 .rmdir = ceph_unlink,
1511 .rename = ceph_rename,
1512 };
1513
1514 const struct dentry_operations ceph_dentry_ops = {
1515 .d_revalidate = ceph_d_revalidate,
1516 .d_release = ceph_d_release,
1517 .d_prune = ceph_d_prune,
1518 .d_init = ceph_d_init,
1519 };
Linux with added FPC-III support