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ceph: search cache postion for dcache readdir
[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 ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR &&
232 ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH &&
233 fpos_cmp(ctx->pos, di->offset) <= 0) {
234 emit_dentry = true;
235 }
236 spin_unlock(&dentry->d_lock);
237
238 if (emit_dentry) {
239 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
240 dentry, dentry, d_inode(dentry));
241 ctx->pos = di->offset;
242 if (!dir_emit(ctx, dentry->d_name.name,
243 dentry->d_name.len,
244 ceph_translate_ino(dentry->d_sb,
245 d_inode(dentry)->i_ino),
246 d_inode(dentry)->i_mode >> 12)) {
247 dput(dentry);
248 err = 0;
249 break;
250 }
251 ctx->pos++;
252
253 if (last)
254 dput(last);
255 last = dentry;
256 } else {
257 dput(dentry);
258 }
259 }
260 out:
261 ceph_readdir_cache_release(&cache_ctl);
262 if (last) {
263 int ret;
264 di = ceph_dentry(last);
265 ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
266 fpos_off(di->offset) + 1);
267 if (ret < 0)
268 err = ret;
269 dput(last);
270 }
271 return err;
272 }
273
274 static int ceph_readdir(struct file *file, struct dir_context *ctx)
275 {
276 struct ceph_file_info *fi = file->private_data;
277 struct inode *inode = file_inode(file);
278 struct ceph_inode_info *ci = ceph_inode(inode);
279 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
280 struct ceph_mds_client *mdsc = fsc->mdsc;
281 unsigned frag = fpos_frag(ctx->pos);
282 int off = fpos_off(ctx->pos);
283 int err;
284 u32 ftype;
285 struct ceph_mds_reply_info_parsed *rinfo;
286
287 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
288 if (fi->flags & CEPH_F_ATEND)
289 return 0;
290
291 /* always start with . and .. */
292 if (ctx->pos == 0) {
293 dout("readdir off 0 -> '.'\n");
294 if (!dir_emit(ctx, ".", 1,
295 ceph_translate_ino(inode->i_sb, inode->i_ino),
296 inode->i_mode >> 12))
297 return 0;
298 ctx->pos = 1;
299 off = 1;
300 }
301 if (ctx->pos == 1) {
302 ino_t ino = parent_ino(file->f_path.dentry);
303 dout("readdir off 1 -> '..'\n");
304 if (!dir_emit(ctx, "..", 2,
305 ceph_translate_ino(inode->i_sb, ino),
306 inode->i_mode >> 12))
307 return 0;
308 ctx->pos = 2;
309 off = 2;
310 }
311
312 /* can we use the dcache? */
313 spin_lock(&ci->i_ceph_lock);
314 if (ceph_test_mount_opt(fsc, DCACHE) &&
315 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
316 ceph_snap(inode) != CEPH_SNAPDIR &&
317 __ceph_dir_is_complete_ordered(ci) &&
318 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
319 u32 shared_gen = ci->i_shared_gen;
320 spin_unlock(&ci->i_ceph_lock);
321 err = __dcache_readdir(file, ctx, shared_gen);
322 if (err != -EAGAIN)
323 return err;
324 frag = fpos_frag(ctx->pos);
325 off = fpos_off(ctx->pos);
326 } else {
327 spin_unlock(&ci->i_ceph_lock);
328 }
329
330 /* proceed with a normal readdir */
331 more:
332 /* do we have the correct frag content buffered? */
333 if (fi->frag != frag || fi->last_readdir == NULL) {
334 struct ceph_mds_request *req;
335 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
336 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
337
338 /* discard old result, if any */
339 if (fi->last_readdir) {
340 ceph_mdsc_put_request(fi->last_readdir);
341 fi->last_readdir = NULL;
342 }
343
344 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
345 ceph_vinop(inode), frag, fi->last_name);
346 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
347 if (IS_ERR(req))
348 return PTR_ERR(req);
349 err = ceph_alloc_readdir_reply_buffer(req, inode);
350 if (err) {
351 ceph_mdsc_put_request(req);
352 return err;
353 }
354 /* hints to request -> mds selection code */
355 req->r_direct_mode = USE_AUTH_MDS;
356 req->r_direct_hash = ceph_frag_value(frag);
357 req->r_direct_is_hash = true;
358 if (fi->last_name) {
359 req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
360 if (!req->r_path2) {
361 ceph_mdsc_put_request(req);
362 return -ENOMEM;
363 }
364 }
365 req->r_dir_release_cnt = fi->dir_release_count;
366 req->r_dir_ordered_cnt = fi->dir_ordered_count;
367 req->r_readdir_cache_idx = fi->readdir_cache_idx;
368 req->r_readdir_offset = fi->next_offset;
369 req->r_args.readdir.frag = cpu_to_le32(frag);
370
371 req->r_inode = inode;
372 ihold(inode);
373 req->r_dentry = dget(file->f_path.dentry);
374 err = ceph_mdsc_do_request(mdsc, NULL, req);
375 if (err < 0) {
376 ceph_mdsc_put_request(req);
377 return err;
378 }
379 dout("readdir got and parsed readdir result=%d"
380 " on frag %x, end=%d, complete=%d\n", err, frag,
381 (int)req->r_reply_info.dir_end,
382 (int)req->r_reply_info.dir_complete);
383
384
385 /* note next offset and last dentry name */
386 rinfo = &req->r_reply_info;
387 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
388 frag = le32_to_cpu(rinfo->dir_dir->frag);
389 off = req->r_readdir_offset;
390 fi->next_offset = off;
391 }
392
393 fi->frag = frag;
394 fi->offset = fi->next_offset;
395 fi->last_readdir = req;
396
397 if (req->r_did_prepopulate) {
398 fi->readdir_cache_idx = req->r_readdir_cache_idx;
399 if (fi->readdir_cache_idx < 0) {
400 /* preclude from marking dir ordered */
401 fi->dir_ordered_count = 0;
402 } else if (ceph_frag_is_leftmost(frag) && off == 2) {
403 /* note dir version at start of readdir so
404 * we can tell if any dentries get dropped */
405 fi->dir_release_count = req->r_dir_release_cnt;
406 fi->dir_ordered_count = req->r_dir_ordered_cnt;
407 }
408 } else {
409 dout("readdir !did_prepopulate");
410 /* disable readdir cache */
411 fi->readdir_cache_idx = -1;
412 /* preclude from marking dir complete */
413 fi->dir_release_count = 0;
414 }
415
416 if (req->r_reply_info.dir_end) {
417 kfree(fi->last_name);
418 fi->last_name = NULL;
419 if (ceph_frag_is_rightmost(frag))
420 fi->next_offset = 2;
421 else
422 fi->next_offset = 0;
423 } else {
424 err = note_last_dentry(fi,
425 rinfo->dir_dname[rinfo->dir_nr-1],
426 rinfo->dir_dname_len[rinfo->dir_nr-1],
427 fi->next_offset + rinfo->dir_nr);
428 if (err)
429 return err;
430 }
431 }
432
433 rinfo = &fi->last_readdir->r_reply_info;
434 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
435 rinfo->dir_nr, off, fi->offset);
436
437 ctx->pos = ceph_make_fpos(frag, off);
438 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
439 struct ceph_mds_reply_inode *in =
440 rinfo->dir_in[off - fi->offset].in;
441 struct ceph_vino vino;
442 ino_t ino;
443
444 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
445 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
446 rinfo->dir_dname_len[off - fi->offset],
447 rinfo->dir_dname[off - fi->offset], in);
448 BUG_ON(!in);
449 ftype = le32_to_cpu(in->mode) >> 12;
450 vino.ino = le64_to_cpu(in->ino);
451 vino.snap = le64_to_cpu(in->snapid);
452 ino = ceph_vino_to_ino(vino);
453 if (!dir_emit(ctx,
454 rinfo->dir_dname[off - fi->offset],
455 rinfo->dir_dname_len[off - fi->offset],
456 ceph_translate_ino(inode->i_sb, ino), ftype)) {
457 dout("filldir stopping us...\n");
458 return 0;
459 }
460 off++;
461 ctx->pos++;
462 }
463
464 if (fi->last_name) {
465 ceph_mdsc_put_request(fi->last_readdir);
466 fi->last_readdir = NULL;
467 goto more;
468 }
469
470 /* more frags? */
471 if (!ceph_frag_is_rightmost(frag)) {
472 frag = ceph_frag_next(frag);
473 off = 0;
474 ctx->pos = ceph_make_fpos(frag, off);
475 dout("readdir next frag is %x\n", frag);
476 goto more;
477 }
478 fi->flags |= CEPH_F_ATEND;
479
480 /*
481 * if dir_release_count still matches the dir, no dentries
482 * were released during the whole readdir, and we should have
483 * the complete dir contents in our cache.
484 */
485 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
486 spin_lock(&ci->i_ceph_lock);
487 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
488 dout(" marking %p complete and ordered\n", inode);
489 /* use i_size to track number of entries in
490 * readdir cache */
491 BUG_ON(fi->readdir_cache_idx < 0);
492 i_size_write(inode, fi->readdir_cache_idx *
493 sizeof(struct dentry*));
494 } else {
495 dout(" marking %p complete\n", inode);
496 }
497 __ceph_dir_set_complete(ci, fi->dir_release_count,
498 fi->dir_ordered_count);
499 spin_unlock(&ci->i_ceph_lock);
500 }
501
502 dout("readdir %p file %p done.\n", inode, file);
503 return 0;
504 }
505
506 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
507 {
508 if (fi->last_readdir) {
509 ceph_mdsc_put_request(fi->last_readdir);
510 fi->last_readdir = NULL;
511 }
512 kfree(fi->last_name);
513 fi->last_name = NULL;
514 fi->dir_release_count = 0;
515 fi->readdir_cache_idx = -1;
516 if (ceph_frag_is_leftmost(frag))
517 fi->next_offset = 2; /* compensate for . and .. */
518 else
519 fi->next_offset = 0;
520 fi->flags &= ~CEPH_F_ATEND;
521 }
522
523 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
524 {
525 struct ceph_file_info *fi = file->private_data;
526 struct inode *inode = file->f_mapping->host;
527 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
528 loff_t retval;
529
530 inode_lock(inode);
531 retval = -EINVAL;
532 switch (whence) {
533 case SEEK_CUR:
534 offset += file->f_pos;
535 case SEEK_SET:
536 break;
537 case SEEK_END:
538 retval = -EOPNOTSUPP;
539 default:
540 goto out;
541 }
542
543 if (offset >= 0) {
544 if (offset != file->f_pos) {
545 file->f_pos = offset;
546 file->f_version = 0;
547 fi->flags &= ~CEPH_F_ATEND;
548 }
549 retval = offset;
550
551 if (offset == 0 ||
552 fpos_frag(offset) != fi->frag ||
553 fpos_off(offset) < fi->offset) {
554 /* discard buffered readdir content on seekdir(0), or
555 * seek to new frag, or seek prior to current chunk */
556 dout("dir_llseek dropping %p content\n", file);
557 reset_readdir(fi, fpos_frag(offset));
558 } else if (fpos_cmp(offset, old_offset) > 0) {
559 /* reset dir_release_count if we did a forward seek */
560 fi->dir_release_count = 0;
561 fi->readdir_cache_idx = -1;
562 }
563 }
564 out:
565 inode_unlock(inode);
566 return retval;
567 }
568
569 /*
570 * Handle lookups for the hidden .snap directory.
571 */
572 int ceph_handle_snapdir(struct ceph_mds_request *req,
573 struct dentry *dentry, int err)
574 {
575 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
576 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
577
578 /* .snap dir? */
579 if (err == -ENOENT &&
580 ceph_snap(parent) == CEPH_NOSNAP &&
581 strcmp(dentry->d_name.name,
582 fsc->mount_options->snapdir_name) == 0) {
583 struct inode *inode = ceph_get_snapdir(parent);
584 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
585 dentry, dentry, inode);
586 BUG_ON(!d_unhashed(dentry));
587 d_add(dentry, inode);
588 err = 0;
589 }
590 return err;
591 }
592
593 /*
594 * Figure out final result of a lookup/open request.
595 *
596 * Mainly, make sure we return the final req->r_dentry (if it already
597 * existed) in place of the original VFS-provided dentry when they
598 * differ.
599 *
600 * Gracefully handle the case where the MDS replies with -ENOENT and
601 * no trace (which it may do, at its discretion, e.g., if it doesn't
602 * care to issue a lease on the negative dentry).
603 */
604 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
605 struct dentry *dentry, int err)
606 {
607 if (err == -ENOENT) {
608 /* no trace? */
609 err = 0;
610 if (!req->r_reply_info.head->is_dentry) {
611 dout("ENOENT and no trace, dentry %p inode %p\n",
612 dentry, d_inode(dentry));
613 if (d_really_is_positive(dentry)) {
614 d_drop(dentry);
615 err = -ENOENT;
616 } else {
617 d_add(dentry, NULL);
618 }
619 }
620 }
621 if (err)
622 dentry = ERR_PTR(err);
623 else if (dentry != req->r_dentry)
624 dentry = dget(req->r_dentry); /* we got spliced */
625 else
626 dentry = NULL;
627 return dentry;
628 }
629
630 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
631 {
632 return ceph_ino(inode) == CEPH_INO_ROOT &&
633 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
634 }
635
636 /*
637 * Look up a single dir entry. If there is a lookup intent, inform
638 * the MDS so that it gets our 'caps wanted' value in a single op.
639 */
640 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
641 unsigned int flags)
642 {
643 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
644 struct ceph_mds_client *mdsc = fsc->mdsc;
645 struct ceph_mds_request *req;
646 int op;
647 int mask;
648 int err;
649
650 dout("lookup %p dentry %p '%pd'\n",
651 dir, dentry, dentry);
652
653 if (dentry->d_name.len > NAME_MAX)
654 return ERR_PTR(-ENAMETOOLONG);
655
656 err = ceph_init_dentry(dentry);
657 if (err < 0)
658 return ERR_PTR(err);
659
660 /* can we conclude ENOENT locally? */
661 if (d_really_is_negative(dentry)) {
662 struct ceph_inode_info *ci = ceph_inode(dir);
663 struct ceph_dentry_info *di = ceph_dentry(dentry);
664
665 spin_lock(&ci->i_ceph_lock);
666 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
667 if (strncmp(dentry->d_name.name,
668 fsc->mount_options->snapdir_name,
669 dentry->d_name.len) &&
670 !is_root_ceph_dentry(dir, dentry) &&
671 ceph_test_mount_opt(fsc, DCACHE) &&
672 __ceph_dir_is_complete(ci) &&
673 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
674 spin_unlock(&ci->i_ceph_lock);
675 dout(" dir %p complete, -ENOENT\n", dir);
676 d_add(dentry, NULL);
677 di->lease_shared_gen = ci->i_shared_gen;
678 return NULL;
679 }
680 spin_unlock(&ci->i_ceph_lock);
681 }
682
683 op = ceph_snap(dir) == CEPH_SNAPDIR ?
684 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
685 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
686 if (IS_ERR(req))
687 return ERR_CAST(req);
688 req->r_dentry = dget(dentry);
689 req->r_num_caps = 2;
690
691 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
692 if (ceph_security_xattr_wanted(dir))
693 mask |= CEPH_CAP_XATTR_SHARED;
694 req->r_args.getattr.mask = cpu_to_le32(mask);
695
696 req->r_locked_dir = dir;
697 err = ceph_mdsc_do_request(mdsc, NULL, req);
698 err = ceph_handle_snapdir(req, dentry, err);
699 dentry = ceph_finish_lookup(req, dentry, err);
700 ceph_mdsc_put_request(req); /* will dput(dentry) */
701 dout("lookup result=%p\n", dentry);
702 return dentry;
703 }
704
705 /*
706 * If we do a create but get no trace back from the MDS, follow up with
707 * a lookup (the VFS expects us to link up the provided dentry).
708 */
709 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
710 {
711 struct dentry *result = ceph_lookup(dir, dentry, 0);
712
713 if (result && !IS_ERR(result)) {
714 /*
715 * We created the item, then did a lookup, and found
716 * it was already linked to another inode we already
717 * had in our cache (and thus got spliced). To not
718 * confuse VFS (especially when inode is a directory),
719 * we don't link our dentry to that inode, return an
720 * error instead.
721 *
722 * This event should be rare and it happens only when
723 * we talk to old MDS. Recent MDS does not send traceless
724 * reply for request that creates new inode.
725 */
726 d_drop(result);
727 return -ESTALE;
728 }
729 return PTR_ERR(result);
730 }
731
732 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
733 umode_t mode, dev_t rdev)
734 {
735 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
736 struct ceph_mds_client *mdsc = fsc->mdsc;
737 struct ceph_mds_request *req;
738 struct ceph_acls_info acls = {};
739 int err;
740
741 if (ceph_snap(dir) != CEPH_NOSNAP)
742 return -EROFS;
743
744 err = ceph_pre_init_acls(dir, &mode, &acls);
745 if (err < 0)
746 return err;
747
748 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
749 dir, dentry, mode, rdev);
750 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
751 if (IS_ERR(req)) {
752 err = PTR_ERR(req);
753 goto out;
754 }
755 req->r_dentry = dget(dentry);
756 req->r_num_caps = 2;
757 req->r_locked_dir = dir;
758 req->r_args.mknod.mode = cpu_to_le32(mode);
759 req->r_args.mknod.rdev = cpu_to_le32(rdev);
760 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
761 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
762 if (acls.pagelist) {
763 req->r_pagelist = acls.pagelist;
764 acls.pagelist = NULL;
765 }
766 err = ceph_mdsc_do_request(mdsc, dir, req);
767 if (!err && !req->r_reply_info.head->is_dentry)
768 err = ceph_handle_notrace_create(dir, dentry);
769 ceph_mdsc_put_request(req);
770 out:
771 if (!err)
772 ceph_init_inode_acls(d_inode(dentry), &acls);
773 else
774 d_drop(dentry);
775 ceph_release_acls_info(&acls);
776 return err;
777 }
778
779 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
780 bool excl)
781 {
782 return ceph_mknod(dir, dentry, mode, 0);
783 }
784
785 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
786 const char *dest)
787 {
788 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
789 struct ceph_mds_client *mdsc = fsc->mdsc;
790 struct ceph_mds_request *req;
791 int err;
792
793 if (ceph_snap(dir) != CEPH_NOSNAP)
794 return -EROFS;
795
796 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
797 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
798 if (IS_ERR(req)) {
799 err = PTR_ERR(req);
800 goto out;
801 }
802 req->r_path2 = kstrdup(dest, GFP_KERNEL);
803 if (!req->r_path2) {
804 err = -ENOMEM;
805 ceph_mdsc_put_request(req);
806 goto out;
807 }
808 req->r_locked_dir = dir;
809 req->r_dentry = dget(dentry);
810 req->r_num_caps = 2;
811 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
812 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
813 err = ceph_mdsc_do_request(mdsc, dir, req);
814 if (!err && !req->r_reply_info.head->is_dentry)
815 err = ceph_handle_notrace_create(dir, dentry);
816 ceph_mdsc_put_request(req);
817 out:
818 if (err)
819 d_drop(dentry);
820 return err;
821 }
822
823 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
824 {
825 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
826 struct ceph_mds_client *mdsc = fsc->mdsc;
827 struct ceph_mds_request *req;
828 struct ceph_acls_info acls = {};
829 int err = -EROFS;
830 int op;
831
832 if (ceph_snap(dir) == CEPH_SNAPDIR) {
833 /* mkdir .snap/foo is a MKSNAP */
834 op = CEPH_MDS_OP_MKSNAP;
835 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
836 dentry, dentry);
837 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
838 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
839 op = CEPH_MDS_OP_MKDIR;
840 } else {
841 goto out;
842 }
843
844 mode |= S_IFDIR;
845 err = ceph_pre_init_acls(dir, &mode, &acls);
846 if (err < 0)
847 goto out;
848
849 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
850 if (IS_ERR(req)) {
851 err = PTR_ERR(req);
852 goto out;
853 }
854
855 req->r_dentry = dget(dentry);
856 req->r_num_caps = 2;
857 req->r_locked_dir = dir;
858 req->r_args.mkdir.mode = cpu_to_le32(mode);
859 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
860 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
861 if (acls.pagelist) {
862 req->r_pagelist = acls.pagelist;
863 acls.pagelist = NULL;
864 }
865 err = ceph_mdsc_do_request(mdsc, dir, req);
866 if (!err &&
867 !req->r_reply_info.head->is_target &&
868 !req->r_reply_info.head->is_dentry)
869 err = ceph_handle_notrace_create(dir, dentry);
870 ceph_mdsc_put_request(req);
871 out:
872 if (!err)
873 ceph_init_inode_acls(d_inode(dentry), &acls);
874 else
875 d_drop(dentry);
876 ceph_release_acls_info(&acls);
877 return err;
878 }
879
880 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
881 struct dentry *dentry)
882 {
883 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
884 struct ceph_mds_client *mdsc = fsc->mdsc;
885 struct ceph_mds_request *req;
886 int err;
887
888 if (ceph_snap(dir) != CEPH_NOSNAP)
889 return -EROFS;
890
891 dout("link in dir %p old_dentry %p dentry %p\n", dir,
892 old_dentry, dentry);
893 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
894 if (IS_ERR(req)) {
895 d_drop(dentry);
896 return PTR_ERR(req);
897 }
898 req->r_dentry = dget(dentry);
899 req->r_num_caps = 2;
900 req->r_old_dentry = dget(old_dentry);
901 req->r_locked_dir = dir;
902 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
903 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
904 /* release LINK_SHARED on source inode (mds will lock it) */
905 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
906 err = ceph_mdsc_do_request(mdsc, dir, req);
907 if (err) {
908 d_drop(dentry);
909 } else if (!req->r_reply_info.head->is_dentry) {
910 ihold(d_inode(old_dentry));
911 d_instantiate(dentry, d_inode(old_dentry));
912 }
913 ceph_mdsc_put_request(req);
914 return err;
915 }
916
917 /*
918 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
919 * looks like the link count will hit 0, drop any other caps (other
920 * than PIN) we don't specifically want (due to the file still being
921 * open).
922 */
923 static int drop_caps_for_unlink(struct inode *inode)
924 {
925 struct ceph_inode_info *ci = ceph_inode(inode);
926 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
927
928 spin_lock(&ci->i_ceph_lock);
929 if (inode->i_nlink == 1) {
930 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
931 ci->i_ceph_flags |= CEPH_I_NODELAY;
932 }
933 spin_unlock(&ci->i_ceph_lock);
934 return drop;
935 }
936
937 /*
938 * rmdir and unlink are differ only by the metadata op code
939 */
940 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
941 {
942 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
943 struct ceph_mds_client *mdsc = fsc->mdsc;
944 struct inode *inode = d_inode(dentry);
945 struct ceph_mds_request *req;
946 int err = -EROFS;
947 int op;
948
949 if (ceph_snap(dir) == CEPH_SNAPDIR) {
950 /* rmdir .snap/foo is RMSNAP */
951 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
952 op = CEPH_MDS_OP_RMSNAP;
953 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
954 dout("unlink/rmdir dir %p dn %p inode %p\n",
955 dir, dentry, inode);
956 op = d_is_dir(dentry) ?
957 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
958 } else
959 goto out;
960 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
961 if (IS_ERR(req)) {
962 err = PTR_ERR(req);
963 goto out;
964 }
965 req->r_dentry = dget(dentry);
966 req->r_num_caps = 2;
967 req->r_locked_dir = dir;
968 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
969 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
970 req->r_inode_drop = drop_caps_for_unlink(inode);
971 err = ceph_mdsc_do_request(mdsc, dir, req);
972 if (!err && !req->r_reply_info.head->is_dentry)
973 d_delete(dentry);
974 ceph_mdsc_put_request(req);
975 out:
976 return err;
977 }
978
979 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
980 struct inode *new_dir, struct dentry *new_dentry)
981 {
982 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
983 struct ceph_mds_client *mdsc = fsc->mdsc;
984 struct ceph_mds_request *req;
985 int op = CEPH_MDS_OP_RENAME;
986 int err;
987
988 if (ceph_snap(old_dir) != ceph_snap(new_dir))
989 return -EXDEV;
990 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
991 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
992 op = CEPH_MDS_OP_RENAMESNAP;
993 else
994 return -EROFS;
995 }
996 dout("rename dir %p dentry %p to dir %p dentry %p\n",
997 old_dir, old_dentry, new_dir, new_dentry);
998 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
999 if (IS_ERR(req))
1000 return PTR_ERR(req);
1001 ihold(old_dir);
1002 req->r_dentry = dget(new_dentry);
1003 req->r_num_caps = 2;
1004 req->r_old_dentry = dget(old_dentry);
1005 req->r_old_dentry_dir = old_dir;
1006 req->r_locked_dir = new_dir;
1007 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1008 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1009 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1010 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1011 /* release LINK_RDCACHE on source inode (mds will lock it) */
1012 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
1013 if (d_really_is_positive(new_dentry))
1014 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
1015 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1016 if (!err && !req->r_reply_info.head->is_dentry) {
1017 /*
1018 * Normally d_move() is done by fill_trace (called by
1019 * do_request, above). If there is no trace, we need
1020 * to do it here.
1021 */
1022
1023 /* d_move screws up sibling dentries' offsets */
1024 ceph_dir_clear_complete(old_dir);
1025 ceph_dir_clear_complete(new_dir);
1026
1027 d_move(old_dentry, new_dentry);
1028
1029 /* ensure target dentry is invalidated, despite
1030 rehashing bug in vfs_rename_dir */
1031 ceph_invalidate_dentry_lease(new_dentry);
1032 }
1033 ceph_mdsc_put_request(req);
1034 return err;
1035 }
1036
1037 /*
1038 * Ensure a dentry lease will no longer revalidate.
1039 */
1040 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1041 {
1042 spin_lock(&dentry->d_lock);
1043 dentry->d_time = jiffies;
1044 ceph_dentry(dentry)->lease_shared_gen = 0;
1045 spin_unlock(&dentry->d_lock);
1046 }
1047
1048 /*
1049 * Check if dentry lease is valid. If not, delete the lease. Try to
1050 * renew if the least is more than half up.
1051 */
1052 static int dentry_lease_is_valid(struct dentry *dentry)
1053 {
1054 struct ceph_dentry_info *di;
1055 struct ceph_mds_session *s;
1056 int valid = 0;
1057 u32 gen;
1058 unsigned long ttl;
1059 struct ceph_mds_session *session = NULL;
1060 struct inode *dir = NULL;
1061 u32 seq = 0;
1062
1063 spin_lock(&dentry->d_lock);
1064 di = ceph_dentry(dentry);
1065 if (di->lease_session) {
1066 s = di->lease_session;
1067 spin_lock(&s->s_gen_ttl_lock);
1068 gen = s->s_cap_gen;
1069 ttl = s->s_cap_ttl;
1070 spin_unlock(&s->s_gen_ttl_lock);
1071
1072 if (di->lease_gen == gen &&
1073 time_before(jiffies, dentry->d_time) &&
1074 time_before(jiffies, ttl)) {
1075 valid = 1;
1076 if (di->lease_renew_after &&
1077 time_after(jiffies, di->lease_renew_after)) {
1078 /* we should renew */
1079 dir = d_inode(dentry->d_parent);
1080 session = ceph_get_mds_session(s);
1081 seq = di->lease_seq;
1082 di->lease_renew_after = 0;
1083 di->lease_renew_from = jiffies;
1084 }
1085 }
1086 }
1087 spin_unlock(&dentry->d_lock);
1088
1089 if (session) {
1090 ceph_mdsc_lease_send_msg(session, dir, dentry,
1091 CEPH_MDS_LEASE_RENEW, seq);
1092 ceph_put_mds_session(session);
1093 }
1094 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1095 return valid;
1096 }
1097
1098 /*
1099 * Check if directory-wide content lease/cap is valid.
1100 */
1101 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1102 {
1103 struct ceph_inode_info *ci = ceph_inode(dir);
1104 struct ceph_dentry_info *di = ceph_dentry(dentry);
1105 int valid = 0;
1106
1107 spin_lock(&ci->i_ceph_lock);
1108 if (ci->i_shared_gen == di->lease_shared_gen)
1109 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1110 spin_unlock(&ci->i_ceph_lock);
1111 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1112 dir, (unsigned)ci->i_shared_gen, dentry,
1113 (unsigned)di->lease_shared_gen, valid);
1114 return valid;
1115 }
1116
1117 /*
1118 * Check if cached dentry can be trusted.
1119 */
1120 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1121 {
1122 int valid = 0;
1123 struct dentry *parent;
1124 struct inode *dir;
1125
1126 if (flags & LOOKUP_RCU)
1127 return -ECHILD;
1128
1129 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1130 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1131
1132 parent = dget_parent(dentry);
1133 dir = d_inode(parent);
1134
1135 /* always trust cached snapped dentries, snapdir dentry */
1136 if (ceph_snap(dir) != CEPH_NOSNAP) {
1137 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1138 dentry, d_inode(dentry));
1139 valid = 1;
1140 } else if (d_really_is_positive(dentry) &&
1141 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1142 valid = 1;
1143 } else if (dentry_lease_is_valid(dentry) ||
1144 dir_lease_is_valid(dir, dentry)) {
1145 if (d_really_is_positive(dentry))
1146 valid = ceph_is_any_caps(d_inode(dentry));
1147 else
1148 valid = 1;
1149 }
1150
1151 if (!valid) {
1152 struct ceph_mds_client *mdsc =
1153 ceph_sb_to_client(dir->i_sb)->mdsc;
1154 struct ceph_mds_request *req;
1155 int op, mask, err;
1156
1157 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1158 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1159 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1160 if (!IS_ERR(req)) {
1161 req->r_dentry = dget(dentry);
1162 req->r_num_caps = 2;
1163
1164 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1165 if (ceph_security_xattr_wanted(dir))
1166 mask |= CEPH_CAP_XATTR_SHARED;
1167 req->r_args.getattr.mask = mask;
1168
1169 req->r_locked_dir = dir;
1170 err = ceph_mdsc_do_request(mdsc, NULL, req);
1171 if (err == 0 || err == -ENOENT) {
1172 if (dentry == req->r_dentry) {
1173 valid = !d_unhashed(dentry);
1174 } else {
1175 d_invalidate(req->r_dentry);
1176 err = -EAGAIN;
1177 }
1178 }
1179 ceph_mdsc_put_request(req);
1180 dout("d_revalidate %p lookup result=%d\n",
1181 dentry, err);
1182 }
1183 }
1184
1185 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1186 if (valid) {
1187 ceph_dentry_lru_touch(dentry);
1188 } else {
1189 ceph_dir_clear_complete(dir);
1190 }
1191
1192 dput(parent);
1193 return valid;
1194 }
1195
1196 /*
1197 * Release our ceph_dentry_info.
1198 */
1199 static void ceph_d_release(struct dentry *dentry)
1200 {
1201 struct ceph_dentry_info *di = ceph_dentry(dentry);
1202
1203 dout("d_release %p\n", dentry);
1204 ceph_dentry_lru_del(dentry);
1205 if (di->lease_session)
1206 ceph_put_mds_session(di->lease_session);
1207 kmem_cache_free(ceph_dentry_cachep, di);
1208 dentry->d_fsdata = NULL;
1209 }
1210
1211 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1212 unsigned int flags)
1213 {
1214 /*
1215 * Eventually, we'll want to revalidate snapped metadata
1216 * too... probably...
1217 */
1218 return 1;
1219 }
1220
1221 /*
1222 * When the VFS prunes a dentry from the cache, we need to clear the
1223 * complete flag on the parent directory.
1224 *
1225 * Called under dentry->d_lock.
1226 */
1227 static void ceph_d_prune(struct dentry *dentry)
1228 {
1229 dout("ceph_d_prune %p\n", dentry);
1230
1231 /* do we have a valid parent? */
1232 if (IS_ROOT(dentry))
1233 return;
1234
1235 /* if we are not hashed, we don't affect dir's completeness */
1236 if (d_unhashed(dentry))
1237 return;
1238
1239 /*
1240 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1241 * cleared until d_release
1242 */
1243 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1244 }
1245
1246 /*
1247 * read() on a dir. This weird interface hack only works if mounted
1248 * with '-o dirstat'.
1249 */
1250 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1251 loff_t *ppos)
1252 {
1253 struct ceph_file_info *cf = file->private_data;
1254 struct inode *inode = file_inode(file);
1255 struct ceph_inode_info *ci = ceph_inode(inode);
1256 int left;
1257 const int bufsize = 1024;
1258
1259 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1260 return -EISDIR;
1261
1262 if (!cf->dir_info) {
1263 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1264 if (!cf->dir_info)
1265 return -ENOMEM;
1266 cf->dir_info_len =
1267 snprintf(cf->dir_info, bufsize,
1268 "entries: %20lld\n"
1269 " files: %20lld\n"
1270 " subdirs: %20lld\n"
1271 "rentries: %20lld\n"
1272 " rfiles: %20lld\n"
1273 " rsubdirs: %20lld\n"
1274 "rbytes: %20lld\n"
1275 "rctime: %10ld.%09ld\n",
1276 ci->i_files + ci->i_subdirs,
1277 ci->i_files,
1278 ci->i_subdirs,
1279 ci->i_rfiles + ci->i_rsubdirs,
1280 ci->i_rfiles,
1281 ci->i_rsubdirs,
1282 ci->i_rbytes,
1283 (long)ci->i_rctime.tv_sec,
1284 (long)ci->i_rctime.tv_nsec);
1285 }
1286
1287 if (*ppos >= cf->dir_info_len)
1288 return 0;
1289 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1290 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1291 if (left == size)
1292 return -EFAULT;
1293 *ppos += (size - left);
1294 return size - left;
1295 }
1296
1297 /*
1298 * We maintain a private dentry LRU.
1299 *
1300 * FIXME: this needs to be changed to a per-mds lru to be useful.
1301 */
1302 void ceph_dentry_lru_add(struct dentry *dn)
1303 {
1304 struct ceph_dentry_info *di = ceph_dentry(dn);
1305 struct ceph_mds_client *mdsc;
1306
1307 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1308 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1309 spin_lock(&mdsc->dentry_lru_lock);
1310 list_add_tail(&di->lru, &mdsc->dentry_lru);
1311 mdsc->num_dentry++;
1312 spin_unlock(&mdsc->dentry_lru_lock);
1313 }
1314
1315 void ceph_dentry_lru_touch(struct dentry *dn)
1316 {
1317 struct ceph_dentry_info *di = ceph_dentry(dn);
1318 struct ceph_mds_client *mdsc;
1319
1320 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1321 di->offset);
1322 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1323 spin_lock(&mdsc->dentry_lru_lock);
1324 list_move_tail(&di->lru, &mdsc->dentry_lru);
1325 spin_unlock(&mdsc->dentry_lru_lock);
1326 }
1327
1328 void ceph_dentry_lru_del(struct dentry *dn)
1329 {
1330 struct ceph_dentry_info *di = ceph_dentry(dn);
1331 struct ceph_mds_client *mdsc;
1332
1333 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1334 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1335 spin_lock(&mdsc->dentry_lru_lock);
1336 list_del_init(&di->lru);
1337 mdsc->num_dentry--;
1338 spin_unlock(&mdsc->dentry_lru_lock);
1339 }
1340
1341 /*
1342 * Return name hash for a given dentry. This is dependent on
1343 * the parent directory's hash function.
1344 */
1345 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1346 {
1347 struct ceph_inode_info *dci = ceph_inode(dir);
1348
1349 switch (dci->i_dir_layout.dl_dir_hash) {
1350 case 0: /* for backward compat */
1351 case CEPH_STR_HASH_LINUX:
1352 return dn->d_name.hash;
1353
1354 default:
1355 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1356 dn->d_name.name, dn->d_name.len);
1357 }
1358 }
1359
1360 const struct file_operations ceph_dir_fops = {
1361 .read = ceph_read_dir,
1362 .iterate = ceph_readdir,
1363 .llseek = ceph_dir_llseek,
1364 .open = ceph_open,
1365 .release = ceph_release,
1366 .unlocked_ioctl = ceph_ioctl,
1367 .fsync = ceph_fsync,
1368 };
1369
1370 const struct file_operations ceph_snapdir_fops = {
1371 .iterate = ceph_readdir,
1372 .llseek = ceph_dir_llseek,
1373 .open = ceph_open,
1374 .release = ceph_release,
1375 };
1376
1377 const struct inode_operations ceph_dir_iops = {
1378 .lookup = ceph_lookup,
1379 .permission = ceph_permission,
1380 .getattr = ceph_getattr,
1381 .setattr = ceph_setattr,
1382 .setxattr = ceph_setxattr,
1383 .getxattr = ceph_getxattr,
1384 .listxattr = ceph_listxattr,
1385 .removexattr = ceph_removexattr,
1386 .get_acl = ceph_get_acl,
1387 .set_acl = ceph_set_acl,
1388 .mknod = ceph_mknod,
1389 .symlink = ceph_symlink,
1390 .mkdir = ceph_mkdir,
1391 .link = ceph_link,
1392 .unlink = ceph_unlink,
1393 .rmdir = ceph_unlink,
1394 .rename = ceph_rename,
1395 .create = ceph_create,
1396 .atomic_open = ceph_atomic_open,
1397 };
1398
1399 const struct inode_operations ceph_snapdir_iops = {
1400 .lookup = ceph_lookup,
1401 .permission = ceph_permission,
1402 .getattr = ceph_getattr,
1403 .mkdir = ceph_mkdir,
1404 .rmdir = ceph_unlink,
1405 .rename = ceph_rename,
1406 };
1407
1408 const struct dentry_operations ceph_dentry_ops = {
1409 .d_revalidate = ceph_d_revalidate,
1410 .d_release = ceph_d_release,
1411 .d_prune = ceph_d_prune,
1412 };
1413
1414 const struct dentry_operations ceph_snapdir_dentry_ops = {
1415 .d_revalidate = ceph_snapdir_d_revalidate,
1416 .d_release = ceph_d_release,
1417 };
1418
1419 const struct dentry_operations ceph_snap_dentry_ops = {
1420 .d_release = ceph_d_release,
1421 .d_prune = ceph_d_prune,
1422 };
Linux kernel - Deliverables
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