Loading...
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
29const struct inode_operations ceph_dir_iops;
30const struct file_operations ceph_dir_fops;
31const struct dentry_operations ceph_dentry_ops;
32
33/*
34 * Initialize ceph dentry state.
35 */
36int ceph_init_dentry(struct dentry *dentry)
37{
38 struct ceph_dentry_info *di;
39
40 if (dentry->d_fsdata)
41 return 0;
42
43 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
44 if (!di)
45 return -ENOMEM; /* oh well */
46
47 spin_lock(&dentry->d_lock);
48 if (dentry->d_fsdata) {
49 /* lost a race */
50 kmem_cache_free(ceph_dentry_cachep, di);
51 goto out_unlock;
52 }
53
54 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
55 d_set_d_op(dentry, &ceph_dentry_ops);
56 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
57 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
58 else
59 d_set_d_op(dentry, &ceph_snap_dentry_ops);
60
61 di->dentry = dentry;
62 di->lease_session = NULL;
63 dentry->d_time = jiffies;
64 /* avoid reordering d_fsdata setup so that the check above is safe */
65 smp_mb();
66 dentry->d_fsdata = di;
67 ceph_dentry_lru_add(dentry);
68out_unlock:
69 spin_unlock(&dentry->d_lock);
70 return 0;
71}
72
73struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
74{
75 struct inode *inode = NULL;
76
77 if (!dentry)
78 return NULL;
79
80 spin_lock(&dentry->d_lock);
81 if (!IS_ROOT(dentry)) {
82 inode = dentry->d_parent->d_inode;
83 ihold(inode);
84 }
85 spin_unlock(&dentry->d_lock);
86 return inode;
87}
88
89
90/*
91 * for readdir, we encode the directory frag and offset within that
92 * frag into f_pos.
93 */
94static unsigned fpos_frag(loff_t p)
95{
96 return p >> 32;
97}
98static unsigned fpos_off(loff_t p)
99{
100 return p & 0xffffffff;
101}
102
103static int fpos_cmp(loff_t l, loff_t r)
104{
105 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
106 if (v)
107 return v;
108 return (int)(fpos_off(l) - fpos_off(r));
109}
110
111/*
112 * When possible, we try to satisfy a readdir by peeking at the
113 * dcache. We make this work by carefully ordering dentries on
114 * d_u.d_child when we initially get results back from the MDS, and
115 * falling back to a "normal" sync readdir if any dentries in the dir
116 * are dropped.
117 *
118 * Complete dir indicates that we have all dentries in the dir. It is
119 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
120 * the MDS if/when the directory is modified).
121 */
122static int __dcache_readdir(struct file *file, struct dir_context *ctx,
123 u32 shared_gen)
124{
125 struct ceph_file_info *fi = file->private_data;
126 struct dentry *parent = file->f_dentry;
127 struct inode *dir = parent->d_inode;
128 struct list_head *p;
129 struct dentry *dentry, *last;
130 struct ceph_dentry_info *di;
131 int err = 0;
132
133 /* claim ref on last dentry we returned */
134 last = fi->dentry;
135 fi->dentry = NULL;
136
137 dout("__dcache_readdir %p v%u at %llu (last %p)\n",
138 dir, shared_gen, ctx->pos, last);
139
140 spin_lock(&parent->d_lock);
141
142 /* start at beginning? */
143 if (ctx->pos == 2 || last == NULL ||
144 fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) {
145 if (list_empty(&parent->d_subdirs))
146 goto out_unlock;
147 p = parent->d_subdirs.prev;
148 dout(" initial p %p/%p\n", p->prev, p->next);
149 } else {
150 p = last->d_u.d_child.prev;
151 }
152
153more:
154 dentry = list_entry(p, struct dentry, d_u.d_child);
155 di = ceph_dentry(dentry);
156 while (1) {
157 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
158 d_unhashed(dentry) ? "!hashed" : "hashed",
159 parent->d_subdirs.prev, parent->d_subdirs.next);
160 if (p == &parent->d_subdirs) {
161 fi->flags |= CEPH_F_ATEND;
162 goto out_unlock;
163 }
164 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
165 if (di->lease_shared_gen == shared_gen &&
166 !d_unhashed(dentry) && dentry->d_inode &&
167 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
168 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
169 fpos_cmp(ctx->pos, di->offset) <= 0)
170 break;
171 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
172 dentry->d_name.len, dentry->d_name.name, di->offset,
173 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
174 !dentry->d_inode ? " null" : "");
175 spin_unlock(&dentry->d_lock);
176 p = p->prev;
177 dentry = list_entry(p, struct dentry, d_u.d_child);
178 di = ceph_dentry(dentry);
179 }
180
181 dget_dlock(dentry);
182 spin_unlock(&dentry->d_lock);
183 spin_unlock(&parent->d_lock);
184
185 /* make sure a dentry wasn't dropped while we didn't have parent lock */
186 if (!ceph_dir_is_complete(dir)) {
187 dout(" lost dir complete on %p; falling back to mds\n", dir);
188 dput(dentry);
189 err = -EAGAIN;
190 goto out;
191 }
192
193 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos,
194 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
195 if (!dir_emit(ctx, dentry->d_name.name,
196 dentry->d_name.len,
197 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
198 dentry->d_inode->i_mode >> 12)) {
199 if (last) {
200 /* remember our position */
201 fi->dentry = last;
202 fi->next_offset = fpos_off(di->offset);
203 }
204 dput(dentry);
205 return 0;
206 }
207
208 ctx->pos = di->offset + 1;
209
210 if (last)
211 dput(last);
212 last = dentry;
213
214 spin_lock(&parent->d_lock);
215 p = p->prev; /* advance to next dentry */
216 goto more;
217
218out_unlock:
219 spin_unlock(&parent->d_lock);
220out:
221 if (last)
222 dput(last);
223 return err;
224}
225
226/*
227 * make note of the last dentry we read, so we can
228 * continue at the same lexicographical point,
229 * regardless of what dir changes take place on the
230 * server.
231 */
232static int note_last_dentry(struct ceph_file_info *fi, const char *name,
233 int len)
234{
235 kfree(fi->last_name);
236 fi->last_name = kmalloc(len+1, GFP_NOFS);
237 if (!fi->last_name)
238 return -ENOMEM;
239 memcpy(fi->last_name, name, len);
240 fi->last_name[len] = 0;
241 dout("note_last_dentry '%s'\n", fi->last_name);
242 return 0;
243}
244
245static int ceph_readdir(struct file *file, struct dir_context *ctx)
246{
247 struct ceph_file_info *fi = file->private_data;
248 struct inode *inode = file_inode(file);
249 struct ceph_inode_info *ci = ceph_inode(inode);
250 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
251 struct ceph_mds_client *mdsc = fsc->mdsc;
252 unsigned frag = fpos_frag(ctx->pos);
253 int off = fpos_off(ctx->pos);
254 int err;
255 u32 ftype;
256 struct ceph_mds_reply_info_parsed *rinfo;
257
258 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
259 if (fi->flags & CEPH_F_ATEND)
260 return 0;
261
262 /* always start with . and .. */
263 if (ctx->pos == 0) {
264 /* note dir version at start of readdir so we can tell
265 * if any dentries get dropped */
266 fi->dir_release_count = atomic_read(&ci->i_release_count);
267
268 dout("readdir off 0 -> '.'\n");
269 if (!dir_emit(ctx, ".", 1,
270 ceph_translate_ino(inode->i_sb, inode->i_ino),
271 inode->i_mode >> 12))
272 return 0;
273 ctx->pos = 1;
274 off = 1;
275 }
276 if (ctx->pos == 1) {
277 ino_t ino = parent_ino(file->f_dentry);
278 dout("readdir off 1 -> '..'\n");
279 if (!dir_emit(ctx, "..", 2,
280 ceph_translate_ino(inode->i_sb, ino),
281 inode->i_mode >> 12))
282 return 0;
283 ctx->pos = 2;
284 off = 2;
285 }
286
287 /* can we use the dcache? */
288 spin_lock(&ci->i_ceph_lock);
289 if ((ctx->pos == 2 || fi->dentry) &&
290 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
291 ceph_snap(inode) != CEPH_SNAPDIR &&
292 __ceph_dir_is_complete(ci) &&
293 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
294 u32 shared_gen = ci->i_shared_gen;
295 spin_unlock(&ci->i_ceph_lock);
296 err = __dcache_readdir(file, ctx, shared_gen);
297 if (err != -EAGAIN)
298 return err;
299 frag = fpos_frag(ctx->pos);
300 off = fpos_off(ctx->pos);
301 } else {
302 spin_unlock(&ci->i_ceph_lock);
303 }
304 if (fi->dentry) {
305 err = note_last_dentry(fi, fi->dentry->d_name.name,
306 fi->dentry->d_name.len);
307 if (err)
308 return err;
309 dput(fi->dentry);
310 fi->dentry = NULL;
311 }
312
313 /* proceed with a normal readdir */
314
315more:
316 /* do we have the correct frag content buffered? */
317 if (fi->frag != frag || fi->last_readdir == NULL) {
318 struct ceph_mds_request *req;
319 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
320 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
321
322 /* discard old result, if any */
323 if (fi->last_readdir) {
324 ceph_mdsc_put_request(fi->last_readdir);
325 fi->last_readdir = NULL;
326 }
327
328 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
329 ceph_vinop(inode), frag, fi->last_name);
330 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
331 if (IS_ERR(req))
332 return PTR_ERR(req);
333 err = ceph_alloc_readdir_reply_buffer(req, inode);
334 if (err) {
335 ceph_mdsc_put_request(req);
336 return err;
337 }
338 req->r_inode = inode;
339 ihold(inode);
340 req->r_dentry = dget(file->f_dentry);
341 /* hints to request -> mds selection code */
342 req->r_direct_mode = USE_AUTH_MDS;
343 req->r_direct_hash = ceph_frag_value(frag);
344 req->r_direct_is_hash = true;
345 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
346 req->r_readdir_offset = fi->next_offset;
347 req->r_args.readdir.frag = cpu_to_le32(frag);
348 err = ceph_mdsc_do_request(mdsc, NULL, req);
349 if (err < 0) {
350 ceph_mdsc_put_request(req);
351 return err;
352 }
353 dout("readdir got and parsed readdir result=%d"
354 " on frag %x, end=%d, complete=%d\n", err, frag,
355 (int)req->r_reply_info.dir_end,
356 (int)req->r_reply_info.dir_complete);
357
358 if (!req->r_did_prepopulate) {
359 dout("readdir !did_prepopulate");
360 /* preclude from marking dir complete */
361 fi->dir_release_count--;
362 }
363
364 /* note next offset and last dentry name */
365 rinfo = &req->r_reply_info;
366 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
367 frag = le32_to_cpu(rinfo->dir_dir->frag);
368 if (ceph_frag_is_leftmost(frag))
369 fi->next_offset = 2;
370 else
371 fi->next_offset = 0;
372 off = fi->next_offset;
373 }
374 fi->frag = frag;
375 fi->offset = fi->next_offset;
376 fi->last_readdir = req;
377
378 if (req->r_reply_info.dir_end) {
379 kfree(fi->last_name);
380 fi->last_name = NULL;
381 if (ceph_frag_is_rightmost(frag))
382 fi->next_offset = 2;
383 else
384 fi->next_offset = 0;
385 } else {
386 err = note_last_dentry(fi,
387 rinfo->dir_dname[rinfo->dir_nr-1],
388 rinfo->dir_dname_len[rinfo->dir_nr-1]);
389 if (err)
390 return err;
391 fi->next_offset += rinfo->dir_nr;
392 }
393 }
394
395 rinfo = &fi->last_readdir->r_reply_info;
396 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
397 rinfo->dir_nr, off, fi->offset);
398
399 ctx->pos = ceph_make_fpos(frag, off);
400 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
401 struct ceph_mds_reply_inode *in =
402 rinfo->dir_in[off - fi->offset].in;
403 struct ceph_vino vino;
404 ino_t ino;
405
406 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
407 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
408 rinfo->dir_dname_len[off - fi->offset],
409 rinfo->dir_dname[off - fi->offset], in);
410 BUG_ON(!in);
411 ftype = le32_to_cpu(in->mode) >> 12;
412 vino.ino = le64_to_cpu(in->ino);
413 vino.snap = le64_to_cpu(in->snapid);
414 ino = ceph_vino_to_ino(vino);
415 if (!dir_emit(ctx,
416 rinfo->dir_dname[off - fi->offset],
417 rinfo->dir_dname_len[off - fi->offset],
418 ceph_translate_ino(inode->i_sb, ino), ftype)) {
419 dout("filldir stopping us...\n");
420 return 0;
421 }
422 off++;
423 ctx->pos++;
424 }
425
426 if (fi->last_name) {
427 ceph_mdsc_put_request(fi->last_readdir);
428 fi->last_readdir = NULL;
429 goto more;
430 }
431
432 /* more frags? */
433 if (!ceph_frag_is_rightmost(frag)) {
434 frag = ceph_frag_next(frag);
435 off = 0;
436 ctx->pos = ceph_make_fpos(frag, off);
437 dout("readdir next frag is %x\n", frag);
438 goto more;
439 }
440 fi->flags |= CEPH_F_ATEND;
441
442 /*
443 * if dir_release_count still matches the dir, no dentries
444 * were released during the whole readdir, and we should have
445 * the complete dir contents in our cache.
446 */
447 spin_lock(&ci->i_ceph_lock);
448 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
449 dout(" marking %p complete\n", inode);
450 __ceph_dir_set_complete(ci, fi->dir_release_count);
451 }
452 spin_unlock(&ci->i_ceph_lock);
453
454 dout("readdir %p file %p done.\n", inode, file);
455 return 0;
456}
457
458static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
459{
460 if (fi->last_readdir) {
461 ceph_mdsc_put_request(fi->last_readdir);
462 fi->last_readdir = NULL;
463 }
464 kfree(fi->last_name);
465 fi->last_name = NULL;
466 if (ceph_frag_is_leftmost(frag))
467 fi->next_offset = 2; /* compensate for . and .. */
468 else
469 fi->next_offset = 0;
470 if (fi->dentry) {
471 dput(fi->dentry);
472 fi->dentry = NULL;
473 }
474 fi->flags &= ~CEPH_F_ATEND;
475}
476
477static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
478{
479 struct ceph_file_info *fi = file->private_data;
480 struct inode *inode = file->f_mapping->host;
481 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
482 loff_t retval;
483
484 mutex_lock(&inode->i_mutex);
485 retval = -EINVAL;
486 switch (whence) {
487 case SEEK_END:
488 offset += inode->i_size + 2; /* FIXME */
489 break;
490 case SEEK_CUR:
491 offset += file->f_pos;
492 case SEEK_SET:
493 break;
494 default:
495 goto out;
496 }
497
498 if (offset >= 0) {
499 if (offset != file->f_pos) {
500 file->f_pos = offset;
501 file->f_version = 0;
502 fi->flags &= ~CEPH_F_ATEND;
503 }
504 retval = offset;
505
506 /*
507 * discard buffered readdir content on seekdir(0), or
508 * seek to new frag, or seek prior to current chunk.
509 */
510 if (offset == 0 ||
511 fpos_frag(offset) != fi->frag ||
512 fpos_off(offset) < fi->offset) {
513 dout("dir_llseek dropping %p content\n", file);
514 reset_readdir(fi, fpos_frag(offset));
515 }
516
517 /* bump dir_release_count if we did a forward seek */
518 if (fpos_cmp(offset, old_offset) > 0)
519 fi->dir_release_count--;
520 }
521out:
522 mutex_unlock(&inode->i_mutex);
523 return retval;
524}
525
526/*
527 * Handle lookups for the hidden .snap directory.
528 */
529int ceph_handle_snapdir(struct ceph_mds_request *req,
530 struct dentry *dentry, int err)
531{
532 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
533 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
534
535 /* .snap dir? */
536 if (err == -ENOENT &&
537 ceph_snap(parent) == CEPH_NOSNAP &&
538 strcmp(dentry->d_name.name,
539 fsc->mount_options->snapdir_name) == 0) {
540 struct inode *inode = ceph_get_snapdir(parent);
541 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
542 dentry, dentry->d_name.len, dentry->d_name.name, inode);
543 BUG_ON(!d_unhashed(dentry));
544 d_add(dentry, inode);
545 err = 0;
546 }
547 return err;
548}
549
550/*
551 * Figure out final result of a lookup/open request.
552 *
553 * Mainly, make sure we return the final req->r_dentry (if it already
554 * existed) in place of the original VFS-provided dentry when they
555 * differ.
556 *
557 * Gracefully handle the case where the MDS replies with -ENOENT and
558 * no trace (which it may do, at its discretion, e.g., if it doesn't
559 * care to issue a lease on the negative dentry).
560 */
561struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
562 struct dentry *dentry, int err)
563{
564 if (err == -ENOENT) {
565 /* no trace? */
566 err = 0;
567 if (!req->r_reply_info.head->is_dentry) {
568 dout("ENOENT and no trace, dentry %p inode %p\n",
569 dentry, dentry->d_inode);
570 if (dentry->d_inode) {
571 d_drop(dentry);
572 err = -ENOENT;
573 } else {
574 d_add(dentry, NULL);
575 }
576 }
577 }
578 if (err)
579 dentry = ERR_PTR(err);
580 else if (dentry != req->r_dentry)
581 dentry = dget(req->r_dentry); /* we got spliced */
582 else
583 dentry = NULL;
584 return dentry;
585}
586
587static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
588{
589 return ceph_ino(inode) == CEPH_INO_ROOT &&
590 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
591}
592
593/*
594 * Look up a single dir entry. If there is a lookup intent, inform
595 * the MDS so that it gets our 'caps wanted' value in a single op.
596 */
597static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
598 unsigned int flags)
599{
600 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
601 struct ceph_mds_client *mdsc = fsc->mdsc;
602 struct ceph_mds_request *req;
603 int op;
604 int err;
605
606 dout("lookup %p dentry %p '%.*s'\n",
607 dir, dentry, dentry->d_name.len, dentry->d_name.name);
608
609 if (dentry->d_name.len > NAME_MAX)
610 return ERR_PTR(-ENAMETOOLONG);
611
612 err = ceph_init_dentry(dentry);
613 if (err < 0)
614 return ERR_PTR(err);
615
616 /* can we conclude ENOENT locally? */
617 if (dentry->d_inode == NULL) {
618 struct ceph_inode_info *ci = ceph_inode(dir);
619 struct ceph_dentry_info *di = ceph_dentry(dentry);
620
621 spin_lock(&ci->i_ceph_lock);
622 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
623 if (strncmp(dentry->d_name.name,
624 fsc->mount_options->snapdir_name,
625 dentry->d_name.len) &&
626 !is_root_ceph_dentry(dir, dentry) &&
627 __ceph_dir_is_complete(ci) &&
628 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
629 spin_unlock(&ci->i_ceph_lock);
630 dout(" dir %p complete, -ENOENT\n", dir);
631 d_add(dentry, NULL);
632 di->lease_shared_gen = ci->i_shared_gen;
633 return NULL;
634 }
635 spin_unlock(&ci->i_ceph_lock);
636 }
637
638 op = ceph_snap(dir) == CEPH_SNAPDIR ?
639 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
640 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
641 if (IS_ERR(req))
642 return ERR_CAST(req);
643 req->r_dentry = dget(dentry);
644 req->r_num_caps = 2;
645 /* we only need inode linkage */
646 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
647 req->r_locked_dir = dir;
648 err = ceph_mdsc_do_request(mdsc, NULL, req);
649 err = ceph_handle_snapdir(req, dentry, err);
650 dentry = ceph_finish_lookup(req, dentry, err);
651 ceph_mdsc_put_request(req); /* will dput(dentry) */
652 dout("lookup result=%p\n", dentry);
653 return dentry;
654}
655
656/*
657 * If we do a create but get no trace back from the MDS, follow up with
658 * a lookup (the VFS expects us to link up the provided dentry).
659 */
660int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
661{
662 struct dentry *result = ceph_lookup(dir, dentry, 0);
663
664 if (result && !IS_ERR(result)) {
665 /*
666 * We created the item, then did a lookup, and found
667 * it was already linked to another inode we already
668 * had in our cache (and thus got spliced). Link our
669 * dentry to that inode, but don't hash it, just in
670 * case the VFS wants to dereference it.
671 */
672 BUG_ON(!result->d_inode);
673 d_instantiate(dentry, result->d_inode);
674 return 0;
675 }
676 return PTR_ERR(result);
677}
678
679static int ceph_mknod(struct inode *dir, struct dentry *dentry,
680 umode_t mode, dev_t rdev)
681{
682 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
683 struct ceph_mds_client *mdsc = fsc->mdsc;
684 struct ceph_mds_request *req;
685 int err;
686
687 if (ceph_snap(dir) != CEPH_NOSNAP)
688 return -EROFS;
689
690 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
691 dir, dentry, mode, rdev);
692 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
693 if (IS_ERR(req)) {
694 d_drop(dentry);
695 return PTR_ERR(req);
696 }
697 req->r_dentry = dget(dentry);
698 req->r_num_caps = 2;
699 req->r_locked_dir = dir;
700 req->r_args.mknod.mode = cpu_to_le32(mode);
701 req->r_args.mknod.rdev = cpu_to_le32(rdev);
702 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
703 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
704 err = ceph_mdsc_do_request(mdsc, dir, req);
705 if (!err && !req->r_reply_info.head->is_dentry)
706 err = ceph_handle_notrace_create(dir, dentry);
707 ceph_mdsc_put_request(req);
708
709 if (!err)
710 ceph_init_acl(dentry, dentry->d_inode, dir);
711 else
712 d_drop(dentry);
713 return err;
714}
715
716static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
717 bool excl)
718{
719 return ceph_mknod(dir, dentry, mode, 0);
720}
721
722static int ceph_symlink(struct inode *dir, struct dentry *dentry,
723 const char *dest)
724{
725 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
726 struct ceph_mds_client *mdsc = fsc->mdsc;
727 struct ceph_mds_request *req;
728 int err;
729
730 if (ceph_snap(dir) != CEPH_NOSNAP)
731 return -EROFS;
732
733 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
734 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
735 if (IS_ERR(req)) {
736 d_drop(dentry);
737 return PTR_ERR(req);
738 }
739 req->r_dentry = dget(dentry);
740 req->r_num_caps = 2;
741 req->r_path2 = kstrdup(dest, GFP_NOFS);
742 req->r_locked_dir = dir;
743 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
744 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
745 err = ceph_mdsc_do_request(mdsc, dir, req);
746 if (!err && !req->r_reply_info.head->is_dentry)
747 err = ceph_handle_notrace_create(dir, dentry);
748 ceph_mdsc_put_request(req);
749 if (!err)
750 ceph_init_acl(dentry, dentry->d_inode, dir);
751 else
752 d_drop(dentry);
753 return err;
754}
755
756static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
757{
758 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
759 struct ceph_mds_client *mdsc = fsc->mdsc;
760 struct ceph_mds_request *req;
761 int err = -EROFS;
762 int op;
763
764 if (ceph_snap(dir) == CEPH_SNAPDIR) {
765 /* mkdir .snap/foo is a MKSNAP */
766 op = CEPH_MDS_OP_MKSNAP;
767 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
768 dentry->d_name.len, dentry->d_name.name, dentry);
769 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
770 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
771 op = CEPH_MDS_OP_MKDIR;
772 } else {
773 goto out;
774 }
775 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
776 if (IS_ERR(req)) {
777 err = PTR_ERR(req);
778 goto out;
779 }
780
781 req->r_dentry = dget(dentry);
782 req->r_num_caps = 2;
783 req->r_locked_dir = dir;
784 req->r_args.mkdir.mode = cpu_to_le32(mode);
785 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
786 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
787 err = ceph_mdsc_do_request(mdsc, dir, req);
788 if (!err && !req->r_reply_info.head->is_dentry)
789 err = ceph_handle_notrace_create(dir, dentry);
790 ceph_mdsc_put_request(req);
791out:
792 if (!err)
793 ceph_init_acl(dentry, dentry->d_inode, dir);
794 else
795 d_drop(dentry);
796 return err;
797}
798
799static int ceph_link(struct dentry *old_dentry, struct inode *dir,
800 struct dentry *dentry)
801{
802 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
803 struct ceph_mds_client *mdsc = fsc->mdsc;
804 struct ceph_mds_request *req;
805 int err;
806
807 if (ceph_snap(dir) != CEPH_NOSNAP)
808 return -EROFS;
809
810 dout("link in dir %p old_dentry %p dentry %p\n", dir,
811 old_dentry, dentry);
812 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
813 if (IS_ERR(req)) {
814 d_drop(dentry);
815 return PTR_ERR(req);
816 }
817 req->r_dentry = dget(dentry);
818 req->r_num_caps = 2;
819 req->r_old_dentry = dget(old_dentry);
820 req->r_locked_dir = dir;
821 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
822 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
823 /* release LINK_SHARED on source inode (mds will lock it) */
824 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
825 err = ceph_mdsc_do_request(mdsc, dir, req);
826 if (err) {
827 d_drop(dentry);
828 } else if (!req->r_reply_info.head->is_dentry) {
829 ihold(old_dentry->d_inode);
830 d_instantiate(dentry, old_dentry->d_inode);
831 }
832 ceph_mdsc_put_request(req);
833 return err;
834}
835
836/*
837 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
838 * looks like the link count will hit 0, drop any other caps (other
839 * than PIN) we don't specifically want (due to the file still being
840 * open).
841 */
842static int drop_caps_for_unlink(struct inode *inode)
843{
844 struct ceph_inode_info *ci = ceph_inode(inode);
845 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
846
847 spin_lock(&ci->i_ceph_lock);
848 if (inode->i_nlink == 1) {
849 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
850 ci->i_ceph_flags |= CEPH_I_NODELAY;
851 }
852 spin_unlock(&ci->i_ceph_lock);
853 return drop;
854}
855
856/*
857 * rmdir and unlink are differ only by the metadata op code
858 */
859static int ceph_unlink(struct inode *dir, struct dentry *dentry)
860{
861 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
862 struct ceph_mds_client *mdsc = fsc->mdsc;
863 struct inode *inode = dentry->d_inode;
864 struct ceph_mds_request *req;
865 int err = -EROFS;
866 int op;
867
868 if (ceph_snap(dir) == CEPH_SNAPDIR) {
869 /* rmdir .snap/foo is RMSNAP */
870 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
871 dentry->d_name.name, dentry);
872 op = CEPH_MDS_OP_RMSNAP;
873 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
874 dout("unlink/rmdir dir %p dn %p inode %p\n",
875 dir, dentry, inode);
876 op = S_ISDIR(dentry->d_inode->i_mode) ?
877 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
878 } else
879 goto out;
880 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
881 if (IS_ERR(req)) {
882 err = PTR_ERR(req);
883 goto out;
884 }
885 req->r_dentry = dget(dentry);
886 req->r_num_caps = 2;
887 req->r_locked_dir = dir;
888 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
889 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
890 req->r_inode_drop = drop_caps_for_unlink(inode);
891 err = ceph_mdsc_do_request(mdsc, dir, req);
892 if (!err && !req->r_reply_info.head->is_dentry)
893 d_delete(dentry);
894 ceph_mdsc_put_request(req);
895out:
896 return err;
897}
898
899static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
900 struct inode *new_dir, struct dentry *new_dentry)
901{
902 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
903 struct ceph_mds_client *mdsc = fsc->mdsc;
904 struct ceph_mds_request *req;
905 int err;
906
907 if (ceph_snap(old_dir) != ceph_snap(new_dir))
908 return -EXDEV;
909 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
910 ceph_snap(new_dir) != CEPH_NOSNAP)
911 return -EROFS;
912 dout("rename dir %p dentry %p to dir %p dentry %p\n",
913 old_dir, old_dentry, new_dir, new_dentry);
914 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
915 if (IS_ERR(req))
916 return PTR_ERR(req);
917 ihold(old_dir);
918 req->r_dentry = dget(new_dentry);
919 req->r_num_caps = 2;
920 req->r_old_dentry = dget(old_dentry);
921 req->r_old_dentry_dir = old_dir;
922 req->r_locked_dir = new_dir;
923 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
924 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
925 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
926 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
927 /* release LINK_RDCACHE on source inode (mds will lock it) */
928 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
929 if (new_dentry->d_inode)
930 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
931 err = ceph_mdsc_do_request(mdsc, old_dir, req);
932 if (!err && !req->r_reply_info.head->is_dentry) {
933 /*
934 * Normally d_move() is done by fill_trace (called by
935 * do_request, above). If there is no trace, we need
936 * to do it here.
937 */
938
939 d_move(old_dentry, new_dentry);
940
941 /* ensure target dentry is invalidated, despite
942 rehashing bug in vfs_rename_dir */
943 ceph_invalidate_dentry_lease(new_dentry);
944
945 /* d_move screws up sibling dentries' offsets */
946 ceph_dir_clear_complete(old_dir);
947 ceph_dir_clear_complete(new_dir);
948
949 }
950 ceph_mdsc_put_request(req);
951 return err;
952}
953
954/*
955 * Ensure a dentry lease will no longer revalidate.
956 */
957void ceph_invalidate_dentry_lease(struct dentry *dentry)
958{
959 spin_lock(&dentry->d_lock);
960 dentry->d_time = jiffies;
961 ceph_dentry(dentry)->lease_shared_gen = 0;
962 spin_unlock(&dentry->d_lock);
963}
964
965/*
966 * Check if dentry lease is valid. If not, delete the lease. Try to
967 * renew if the least is more than half up.
968 */
969static int dentry_lease_is_valid(struct dentry *dentry)
970{
971 struct ceph_dentry_info *di;
972 struct ceph_mds_session *s;
973 int valid = 0;
974 u32 gen;
975 unsigned long ttl;
976 struct ceph_mds_session *session = NULL;
977 struct inode *dir = NULL;
978 u32 seq = 0;
979
980 spin_lock(&dentry->d_lock);
981 di = ceph_dentry(dentry);
982 if (di->lease_session) {
983 s = di->lease_session;
984 spin_lock(&s->s_gen_ttl_lock);
985 gen = s->s_cap_gen;
986 ttl = s->s_cap_ttl;
987 spin_unlock(&s->s_gen_ttl_lock);
988
989 if (di->lease_gen == gen &&
990 time_before(jiffies, dentry->d_time) &&
991 time_before(jiffies, ttl)) {
992 valid = 1;
993 if (di->lease_renew_after &&
994 time_after(jiffies, di->lease_renew_after)) {
995 /* we should renew */
996 dir = dentry->d_parent->d_inode;
997 session = ceph_get_mds_session(s);
998 seq = di->lease_seq;
999 di->lease_renew_after = 0;
1000 di->lease_renew_from = jiffies;
1001 }
1002 }
1003 }
1004 spin_unlock(&dentry->d_lock);
1005
1006 if (session) {
1007 ceph_mdsc_lease_send_msg(session, dir, dentry,
1008 CEPH_MDS_LEASE_RENEW, seq);
1009 ceph_put_mds_session(session);
1010 }
1011 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1012 return valid;
1013}
1014
1015/*
1016 * Check if directory-wide content lease/cap is valid.
1017 */
1018static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1019{
1020 struct ceph_inode_info *ci = ceph_inode(dir);
1021 struct ceph_dentry_info *di = ceph_dentry(dentry);
1022 int valid = 0;
1023
1024 spin_lock(&ci->i_ceph_lock);
1025 if (ci->i_shared_gen == di->lease_shared_gen)
1026 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1027 spin_unlock(&ci->i_ceph_lock);
1028 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1029 dir, (unsigned)ci->i_shared_gen, dentry,
1030 (unsigned)di->lease_shared_gen, valid);
1031 return valid;
1032}
1033
1034/*
1035 * Check if cached dentry can be trusted.
1036 */
1037static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1038{
1039 int valid = 0;
1040 struct inode *dir;
1041
1042 if (flags & LOOKUP_RCU)
1043 return -ECHILD;
1044
1045 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1046 dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1047 ceph_dentry(dentry)->offset);
1048
1049 dir = ceph_get_dentry_parent_inode(dentry);
1050
1051 /* always trust cached snapped dentries, snapdir dentry */
1052 if (ceph_snap(dir) != CEPH_NOSNAP) {
1053 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1054 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1055 valid = 1;
1056 } else if (dentry->d_inode &&
1057 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1058 valid = 1;
1059 } else if (dentry_lease_is_valid(dentry) ||
1060 dir_lease_is_valid(dir, dentry)) {
1061 if (dentry->d_inode)
1062 valid = ceph_is_any_caps(dentry->d_inode);
1063 else
1064 valid = 1;
1065 }
1066
1067 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1068 if (valid) {
1069 ceph_dentry_lru_touch(dentry);
1070 } else {
1071 ceph_dir_clear_complete(dir);
1072 d_drop(dentry);
1073 }
1074 iput(dir);
1075 return valid;
1076}
1077
1078/*
1079 * Release our ceph_dentry_info.
1080 */
1081static void ceph_d_release(struct dentry *dentry)
1082{
1083 struct ceph_dentry_info *di = ceph_dentry(dentry);
1084
1085 dout("d_release %p\n", dentry);
1086 ceph_dentry_lru_del(dentry);
1087 if (di->lease_session)
1088 ceph_put_mds_session(di->lease_session);
1089 kmem_cache_free(ceph_dentry_cachep, di);
1090 dentry->d_fsdata = NULL;
1091}
1092
1093static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1094 unsigned int flags)
1095{
1096 /*
1097 * Eventually, we'll want to revalidate snapped metadata
1098 * too... probably...
1099 */
1100 return 1;
1101}
1102
1103/*
1104 * When the VFS prunes a dentry from the cache, we need to clear the
1105 * complete flag on the parent directory.
1106 *
1107 * Called under dentry->d_lock.
1108 */
1109static void ceph_d_prune(struct dentry *dentry)
1110{
1111 dout("ceph_d_prune %p\n", dentry);
1112
1113 /* do we have a valid parent? */
1114 if (IS_ROOT(dentry))
1115 return;
1116
1117 /* if we are not hashed, we don't affect dir's completeness */
1118 if (d_unhashed(dentry))
1119 return;
1120
1121 /*
1122 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1123 * cleared until d_release
1124 */
1125 ceph_dir_clear_complete(dentry->d_parent->d_inode);
1126}
1127
1128/*
1129 * read() on a dir. This weird interface hack only works if mounted
1130 * with '-o dirstat'.
1131 */
1132static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1133 loff_t *ppos)
1134{
1135 struct ceph_file_info *cf = file->private_data;
1136 struct inode *inode = file_inode(file);
1137 struct ceph_inode_info *ci = ceph_inode(inode);
1138 int left;
1139 const int bufsize = 1024;
1140
1141 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1142 return -EISDIR;
1143
1144 if (!cf->dir_info) {
1145 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1146 if (!cf->dir_info)
1147 return -ENOMEM;
1148 cf->dir_info_len =
1149 snprintf(cf->dir_info, bufsize,
1150 "entries: %20lld\n"
1151 " files: %20lld\n"
1152 " subdirs: %20lld\n"
1153 "rentries: %20lld\n"
1154 " rfiles: %20lld\n"
1155 " rsubdirs: %20lld\n"
1156 "rbytes: %20lld\n"
1157 "rctime: %10ld.%09ld\n",
1158 ci->i_files + ci->i_subdirs,
1159 ci->i_files,
1160 ci->i_subdirs,
1161 ci->i_rfiles + ci->i_rsubdirs,
1162 ci->i_rfiles,
1163 ci->i_rsubdirs,
1164 ci->i_rbytes,
1165 (long)ci->i_rctime.tv_sec,
1166 (long)ci->i_rctime.tv_nsec);
1167 }
1168
1169 if (*ppos >= cf->dir_info_len)
1170 return 0;
1171 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1172 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1173 if (left == size)
1174 return -EFAULT;
1175 *ppos += (size - left);
1176 return size - left;
1177}
1178
1179/*
1180 * an fsync() on a dir will wait for any uncommitted directory
1181 * operations to commit.
1182 */
1183static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1184 int datasync)
1185{
1186 struct inode *inode = file_inode(file);
1187 struct ceph_inode_info *ci = ceph_inode(inode);
1188 struct list_head *head = &ci->i_unsafe_dirops;
1189 struct ceph_mds_request *req;
1190 u64 last_tid;
1191 int ret = 0;
1192
1193 dout("dir_fsync %p\n", inode);
1194 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1195 if (ret)
1196 return ret;
1197 mutex_lock(&inode->i_mutex);
1198
1199 spin_lock(&ci->i_unsafe_lock);
1200 if (list_empty(head))
1201 goto out;
1202
1203 req = list_entry(head->prev,
1204 struct ceph_mds_request, r_unsafe_dir_item);
1205 last_tid = req->r_tid;
1206
1207 do {
1208 ceph_mdsc_get_request(req);
1209 spin_unlock(&ci->i_unsafe_lock);
1210
1211 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1212 inode, req->r_tid, last_tid);
1213 if (req->r_timeout) {
1214 ret = wait_for_completion_timeout(
1215 &req->r_safe_completion, req->r_timeout);
1216 if (ret > 0)
1217 ret = 0;
1218 else if (ret == 0)
1219 ret = -EIO; /* timed out */
1220 } else {
1221 wait_for_completion(&req->r_safe_completion);
1222 }
1223 ceph_mdsc_put_request(req);
1224
1225 spin_lock(&ci->i_unsafe_lock);
1226 if (ret || list_empty(head))
1227 break;
1228 req = list_entry(head->next,
1229 struct ceph_mds_request, r_unsafe_dir_item);
1230 } while (req->r_tid < last_tid);
1231out:
1232 spin_unlock(&ci->i_unsafe_lock);
1233 mutex_unlock(&inode->i_mutex);
1234
1235 return ret;
1236}
1237
1238/*
1239 * We maintain a private dentry LRU.
1240 *
1241 * FIXME: this needs to be changed to a per-mds lru to be useful.
1242 */
1243void ceph_dentry_lru_add(struct dentry *dn)
1244{
1245 struct ceph_dentry_info *di = ceph_dentry(dn);
1246 struct ceph_mds_client *mdsc;
1247
1248 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1249 dn->d_name.len, dn->d_name.name);
1250 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1251 spin_lock(&mdsc->dentry_lru_lock);
1252 list_add_tail(&di->lru, &mdsc->dentry_lru);
1253 mdsc->num_dentry++;
1254 spin_unlock(&mdsc->dentry_lru_lock);
1255}
1256
1257void ceph_dentry_lru_touch(struct dentry *dn)
1258{
1259 struct ceph_dentry_info *di = ceph_dentry(dn);
1260 struct ceph_mds_client *mdsc;
1261
1262 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1263 dn->d_name.len, dn->d_name.name, di->offset);
1264 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1265 spin_lock(&mdsc->dentry_lru_lock);
1266 list_move_tail(&di->lru, &mdsc->dentry_lru);
1267 spin_unlock(&mdsc->dentry_lru_lock);
1268}
1269
1270void ceph_dentry_lru_del(struct dentry *dn)
1271{
1272 struct ceph_dentry_info *di = ceph_dentry(dn);
1273 struct ceph_mds_client *mdsc;
1274
1275 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1276 dn->d_name.len, dn->d_name.name);
1277 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1278 spin_lock(&mdsc->dentry_lru_lock);
1279 list_del_init(&di->lru);
1280 mdsc->num_dentry--;
1281 spin_unlock(&mdsc->dentry_lru_lock);
1282}
1283
1284/*
1285 * Return name hash for a given dentry. This is dependent on
1286 * the parent directory's hash function.
1287 */
1288unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1289{
1290 struct ceph_inode_info *dci = ceph_inode(dir);
1291
1292 switch (dci->i_dir_layout.dl_dir_hash) {
1293 case 0: /* for backward compat */
1294 case CEPH_STR_HASH_LINUX:
1295 return dn->d_name.hash;
1296
1297 default:
1298 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1299 dn->d_name.name, dn->d_name.len);
1300 }
1301}
1302
1303const struct file_operations ceph_dir_fops = {
1304 .read = ceph_read_dir,
1305 .iterate = ceph_readdir,
1306 .llseek = ceph_dir_llseek,
1307 .open = ceph_open,
1308 .release = ceph_release,
1309 .unlocked_ioctl = ceph_ioctl,
1310 .fsync = ceph_dir_fsync,
1311};
1312
1313const struct inode_operations ceph_dir_iops = {
1314 .lookup = ceph_lookup,
1315 .permission = ceph_permission,
1316 .getattr = ceph_getattr,
1317 .setattr = ceph_setattr,
1318 .setxattr = ceph_setxattr,
1319 .getxattr = ceph_getxattr,
1320 .listxattr = ceph_listxattr,
1321 .removexattr = ceph_removexattr,
1322 .get_acl = ceph_get_acl,
1323 .set_acl = ceph_set_acl,
1324 .mknod = ceph_mknod,
1325 .symlink = ceph_symlink,
1326 .mkdir = ceph_mkdir,
1327 .link = ceph_link,
1328 .unlink = ceph_unlink,
1329 .rmdir = ceph_unlink,
1330 .rename = ceph_rename,
1331 .create = ceph_create,
1332 .atomic_open = ceph_atomic_open,
1333};
1334
1335const struct dentry_operations ceph_dentry_ops = {
1336 .d_revalidate = ceph_d_revalidate,
1337 .d_release = ceph_d_release,
1338 .d_prune = ceph_d_prune,
1339};
1340
1341const struct dentry_operations ceph_snapdir_dentry_ops = {
1342 .d_revalidate = ceph_snapdir_d_revalidate,
1343 .d_release = ceph_d_release,
1344};
1345
1346const struct dentry_operations ceph_snap_dentry_ops = {
1347 .d_release = ceph_d_release,
1348 .d_prune = ceph_d_prune,
1349};
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/spinlock.h>
5#include <linux/namei.h>
6#include <linux/slab.h>
7#include <linux/sched.h>
8#include <linux/xattr.h>
9
10#include "super.h"
11#include "mds_client.h"
12
13/*
14 * Directory operations: readdir, lookup, create, link, unlink,
15 * rename, etc.
16 */
17
18/*
19 * Ceph MDS operations are specified in terms of a base ino and
20 * relative path. Thus, the client can specify an operation on a
21 * specific inode (e.g., a getattr due to fstat(2)), or as a path
22 * relative to, say, the root directory.
23 *
24 * Normally, we limit ourselves to strict inode ops (no path component)
25 * or dentry operations (a single path component relative to an ino). The
26 * exception to this is open_root_dentry(), which will open the mount
27 * point by name.
28 */
29
30const struct dentry_operations ceph_dentry_ops;
31
32static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
33static int __dir_lease_try_check(const struct dentry *dentry);
34
35/*
36 * Initialize ceph dentry state.
37 */
38static int ceph_d_init(struct dentry *dentry)
39{
40 struct ceph_dentry_info *di;
41 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);
42
43 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
44 if (!di)
45 return -ENOMEM; /* oh well */
46
47 di->dentry = dentry;
48 di->lease_session = NULL;
49 di->time = jiffies;
50 dentry->d_fsdata = di;
51 INIT_LIST_HEAD(&di->lease_list);
52
53 atomic64_inc(&mdsc->metric.total_dentries);
54
55 return 0;
56}
57
58/*
59 * for f_pos for readdir:
60 * - hash order:
61 * (0xff << 52) | ((24 bits hash) << 28) |
62 * (the nth entry has hash collision);
63 * - frag+name order;
64 * ((frag value) << 28) | (the nth entry in frag);
65 */
66#define OFFSET_BITS 28
67#define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
68#define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
69loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
70{
71 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
72 if (hash_order)
73 fpos |= HASH_ORDER;
74 return fpos;
75}
76
77static bool is_hash_order(loff_t p)
78{
79 return (p & HASH_ORDER) == HASH_ORDER;
80}
81
82static unsigned fpos_frag(loff_t p)
83{
84 return p >> OFFSET_BITS;
85}
86
87static unsigned fpos_hash(loff_t p)
88{
89 return ceph_frag_value(fpos_frag(p));
90}
91
92static unsigned fpos_off(loff_t p)
93{
94 return p & OFFSET_MASK;
95}
96
97static int fpos_cmp(loff_t l, loff_t r)
98{
99 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
100 if (v)
101 return v;
102 return (int)(fpos_off(l) - fpos_off(r));
103}
104
105/*
106 * make note of the last dentry we read, so we can
107 * continue at the same lexicographical point,
108 * regardless of what dir changes take place on the
109 * server.
110 */
111static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
112 int len, unsigned next_offset)
113{
114 char *buf = kmalloc(len+1, GFP_KERNEL);
115 if (!buf)
116 return -ENOMEM;
117 kfree(dfi->last_name);
118 dfi->last_name = buf;
119 memcpy(dfi->last_name, name, len);
120 dfi->last_name[len] = 0;
121 dfi->next_offset = next_offset;
122 dout("note_last_dentry '%s'\n", dfi->last_name);
123 return 0;
124}
125
126
127static struct dentry *
128__dcache_find_get_entry(struct dentry *parent, u64 idx,
129 struct ceph_readdir_cache_control *cache_ctl)
130{
131 struct inode *dir = d_inode(parent);
132 struct dentry *dentry;
133 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
134 loff_t ptr_pos = idx * sizeof(struct dentry *);
135 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
136
137 if (ptr_pos >= i_size_read(dir))
138 return NULL;
139
140 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
141 ceph_readdir_cache_release(cache_ctl);
142 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
143 if (!cache_ctl->page) {
144 dout(" page %lu not found\n", ptr_pgoff);
145 return ERR_PTR(-EAGAIN);
146 }
147 /* reading/filling the cache are serialized by
148 i_rwsem, no need to use page lock */
149 unlock_page(cache_ctl->page);
150 cache_ctl->dentries = kmap(cache_ctl->page);
151 }
152
153 cache_ctl->index = idx & idx_mask;
154
155 rcu_read_lock();
156 spin_lock(&parent->d_lock);
157 /* check i_size again here, because empty directory can be
158 * marked as complete while not holding the i_rwsem. */
159 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
160 dentry = cache_ctl->dentries[cache_ctl->index];
161 else
162 dentry = NULL;
163 spin_unlock(&parent->d_lock);
164 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
165 dentry = NULL;
166 rcu_read_unlock();
167 return dentry ? : ERR_PTR(-EAGAIN);
168}
169
170/*
171 * When possible, we try to satisfy a readdir by peeking at the
172 * dcache. We make this work by carefully ordering dentries on
173 * d_child when we initially get results back from the MDS, and
174 * falling back to a "normal" sync readdir if any dentries in the dir
175 * are dropped.
176 *
177 * Complete dir indicates that we have all dentries in the dir. It is
178 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
179 * the MDS if/when the directory is modified).
180 */
181static int __dcache_readdir(struct file *file, struct dir_context *ctx,
182 int shared_gen)
183{
184 struct ceph_dir_file_info *dfi = file->private_data;
185 struct dentry *parent = file->f_path.dentry;
186 struct inode *dir = d_inode(parent);
187 struct dentry *dentry, *last = NULL;
188 struct ceph_dentry_info *di;
189 struct ceph_readdir_cache_control cache_ctl = {};
190 u64 idx = 0;
191 int err = 0;
192
193 dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
194
195 /* search start position */
196 if (ctx->pos > 2) {
197 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
198 while (count > 0) {
199 u64 step = count >> 1;
200 dentry = __dcache_find_get_entry(parent, idx + step,
201 &cache_ctl);
202 if (!dentry) {
203 /* use linar search */
204 idx = 0;
205 break;
206 }
207 if (IS_ERR(dentry)) {
208 err = PTR_ERR(dentry);
209 goto out;
210 }
211 di = ceph_dentry(dentry);
212 spin_lock(&dentry->d_lock);
213 if (fpos_cmp(di->offset, ctx->pos) < 0) {
214 idx += step + 1;
215 count -= step + 1;
216 } else {
217 count = step;
218 }
219 spin_unlock(&dentry->d_lock);
220 dput(dentry);
221 }
222
223 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
224 }
225
226
227 for (;;) {
228 bool emit_dentry = false;
229 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
230 if (!dentry) {
231 dfi->file_info.flags |= CEPH_F_ATEND;
232 err = 0;
233 break;
234 }
235 if (IS_ERR(dentry)) {
236 err = PTR_ERR(dentry);
237 goto out;
238 }
239
240 spin_lock(&dentry->d_lock);
241 di = ceph_dentry(dentry);
242 if (d_unhashed(dentry) ||
243 d_really_is_negative(dentry) ||
244 di->lease_shared_gen != shared_gen) {
245 spin_unlock(&dentry->d_lock);
246 dput(dentry);
247 err = -EAGAIN;
248 goto out;
249 }
250 if (fpos_cmp(ctx->pos, di->offset) <= 0) {
251 __ceph_dentry_dir_lease_touch(di);
252 emit_dentry = true;
253 }
254 spin_unlock(&dentry->d_lock);
255
256 if (emit_dentry) {
257 dout(" %llx dentry %p %pd %p\n", di->offset,
258 dentry, dentry, d_inode(dentry));
259 ctx->pos = di->offset;
260 if (!dir_emit(ctx, dentry->d_name.name,
261 dentry->d_name.len, ceph_present_inode(d_inode(dentry)),
262 d_inode(dentry)->i_mode >> 12)) {
263 dput(dentry);
264 err = 0;
265 break;
266 }
267 ctx->pos++;
268
269 if (last)
270 dput(last);
271 last = dentry;
272 } else {
273 dput(dentry);
274 }
275 }
276out:
277 ceph_readdir_cache_release(&cache_ctl);
278 if (last) {
279 int ret;
280 di = ceph_dentry(last);
281 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
282 fpos_off(di->offset) + 1);
283 if (ret < 0)
284 err = ret;
285 dput(last);
286 /* last_name no longer match cache index */
287 if (dfi->readdir_cache_idx >= 0) {
288 dfi->readdir_cache_idx = -1;
289 dfi->dir_release_count = 0;
290 }
291 }
292 return err;
293}
294
295static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
296{
297 if (!dfi->last_readdir)
298 return true;
299 if (is_hash_order(pos))
300 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
301 else
302 return dfi->frag != fpos_frag(pos);
303}
304
305static int ceph_readdir(struct file *file, struct dir_context *ctx)
306{
307 struct ceph_dir_file_info *dfi = file->private_data;
308 struct inode *inode = file_inode(file);
309 struct ceph_inode_info *ci = ceph_inode(inode);
310 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
311 struct ceph_mds_client *mdsc = fsc->mdsc;
312 int i;
313 int err;
314 unsigned frag = -1;
315 struct ceph_mds_reply_info_parsed *rinfo;
316
317 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
318 if (dfi->file_info.flags & CEPH_F_ATEND)
319 return 0;
320
321 /* always start with . and .. */
322 if (ctx->pos == 0) {
323 dout("readdir off 0 -> '.'\n");
324 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),
325 inode->i_mode >> 12))
326 return 0;
327 ctx->pos = 1;
328 }
329 if (ctx->pos == 1) {
330 u64 ino;
331 struct dentry *dentry = file->f_path.dentry;
332
333 spin_lock(&dentry->d_lock);
334 ino = ceph_present_inode(dentry->d_parent->d_inode);
335 spin_unlock(&dentry->d_lock);
336
337 dout("readdir off 1 -> '..'\n");
338 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))
339 return 0;
340 ctx->pos = 2;
341 }
342
343 spin_lock(&ci->i_ceph_lock);
344 /* request Fx cap. if have Fx, we don't need to release Fs cap
345 * for later create/unlink. */
346 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
347 /* can we use the dcache? */
348 if (ceph_test_mount_opt(fsc, DCACHE) &&
349 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
350 ceph_snap(inode) != CEPH_SNAPDIR &&
351 __ceph_dir_is_complete_ordered(ci) &&
352 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
353 int shared_gen = atomic_read(&ci->i_shared_gen);
354
355 spin_unlock(&ci->i_ceph_lock);
356 err = __dcache_readdir(file, ctx, shared_gen);
357 if (err != -EAGAIN)
358 return err;
359 } else {
360 spin_unlock(&ci->i_ceph_lock);
361 }
362
363 /* proceed with a normal readdir */
364more:
365 /* do we have the correct frag content buffered? */
366 if (need_send_readdir(dfi, ctx->pos)) {
367 struct ceph_mds_request *req;
368 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
369 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
370
371 /* discard old result, if any */
372 if (dfi->last_readdir) {
373 ceph_mdsc_put_request(dfi->last_readdir);
374 dfi->last_readdir = NULL;
375 }
376
377 if (is_hash_order(ctx->pos)) {
378 /* fragtree isn't always accurate. choose frag
379 * based on previous reply when possible. */
380 if (frag == (unsigned)-1)
381 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
382 NULL, NULL);
383 } else {
384 frag = fpos_frag(ctx->pos);
385 }
386
387 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
388 ceph_vinop(inode), frag, dfi->last_name);
389 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
390 if (IS_ERR(req))
391 return PTR_ERR(req);
392 err = ceph_alloc_readdir_reply_buffer(req, inode);
393 if (err) {
394 ceph_mdsc_put_request(req);
395 return err;
396 }
397 /* hints to request -> mds selection code */
398 req->r_direct_mode = USE_AUTH_MDS;
399 if (op == CEPH_MDS_OP_READDIR) {
400 req->r_direct_hash = ceph_frag_value(frag);
401 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
402 req->r_inode_drop = CEPH_CAP_FILE_EXCL;
403 }
404 if (dfi->last_name) {
405 req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
406 if (!req->r_path2) {
407 ceph_mdsc_put_request(req);
408 return -ENOMEM;
409 }
410 } else if (is_hash_order(ctx->pos)) {
411 req->r_args.readdir.offset_hash =
412 cpu_to_le32(fpos_hash(ctx->pos));
413 }
414
415 req->r_dir_release_cnt = dfi->dir_release_count;
416 req->r_dir_ordered_cnt = dfi->dir_ordered_count;
417 req->r_readdir_cache_idx = dfi->readdir_cache_idx;
418 req->r_readdir_offset = dfi->next_offset;
419 req->r_args.readdir.frag = cpu_to_le32(frag);
420 req->r_args.readdir.flags =
421 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
422
423 req->r_inode = inode;
424 ihold(inode);
425 req->r_dentry = dget(file->f_path.dentry);
426 err = ceph_mdsc_do_request(mdsc, NULL, req);
427 if (err < 0) {
428 ceph_mdsc_put_request(req);
429 return err;
430 }
431 dout("readdir got and parsed readdir result=%d on "
432 "frag %x, end=%d, complete=%d, hash_order=%d\n",
433 err, frag,
434 (int)req->r_reply_info.dir_end,
435 (int)req->r_reply_info.dir_complete,
436 (int)req->r_reply_info.hash_order);
437
438 rinfo = &req->r_reply_info;
439 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
440 frag = le32_to_cpu(rinfo->dir_dir->frag);
441 if (!rinfo->hash_order) {
442 dfi->next_offset = req->r_readdir_offset;
443 /* adjust ctx->pos to beginning of frag */
444 ctx->pos = ceph_make_fpos(frag,
445 dfi->next_offset,
446 false);
447 }
448 }
449
450 dfi->frag = frag;
451 dfi->last_readdir = req;
452
453 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
454 dfi->readdir_cache_idx = req->r_readdir_cache_idx;
455 if (dfi->readdir_cache_idx < 0) {
456 /* preclude from marking dir ordered */
457 dfi->dir_ordered_count = 0;
458 } else if (ceph_frag_is_leftmost(frag) &&
459 dfi->next_offset == 2) {
460 /* note dir version at start of readdir so
461 * we can tell if any dentries get dropped */
462 dfi->dir_release_count = req->r_dir_release_cnt;
463 dfi->dir_ordered_count = req->r_dir_ordered_cnt;
464 }
465 } else {
466 dout("readdir !did_prepopulate\n");
467 /* disable readdir cache */
468 dfi->readdir_cache_idx = -1;
469 /* preclude from marking dir complete */
470 dfi->dir_release_count = 0;
471 }
472
473 /* note next offset and last dentry name */
474 if (rinfo->dir_nr > 0) {
475 struct ceph_mds_reply_dir_entry *rde =
476 rinfo->dir_entries + (rinfo->dir_nr-1);
477 unsigned next_offset = req->r_reply_info.dir_end ?
478 2 : (fpos_off(rde->offset) + 1);
479 err = note_last_dentry(dfi, rde->name, rde->name_len,
480 next_offset);
481 if (err) {
482 ceph_mdsc_put_request(dfi->last_readdir);
483 dfi->last_readdir = NULL;
484 return err;
485 }
486 } else if (req->r_reply_info.dir_end) {
487 dfi->next_offset = 2;
488 /* keep last name */
489 }
490 }
491
492 rinfo = &dfi->last_readdir->r_reply_info;
493 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
494 dfi->frag, rinfo->dir_nr, ctx->pos,
495 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
496
497 i = 0;
498 /* search start position */
499 if (rinfo->dir_nr > 0) {
500 int step, nr = rinfo->dir_nr;
501 while (nr > 0) {
502 step = nr >> 1;
503 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
504 i += step + 1;
505 nr -= step + 1;
506 } else {
507 nr = step;
508 }
509 }
510 }
511 for (; i < rinfo->dir_nr; i++) {
512 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
513
514 BUG_ON(rde->offset < ctx->pos);
515
516 ctx->pos = rde->offset;
517 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
518 i, rinfo->dir_nr, ctx->pos,
519 rde->name_len, rde->name, &rde->inode.in);
520
521 BUG_ON(!rde->inode.in);
522
523 if (!dir_emit(ctx, rde->name, rde->name_len,
524 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),
525 le32_to_cpu(rde->inode.in->mode) >> 12)) {
526 /*
527 * NOTE: Here no need to put the 'dfi->last_readdir',
528 * because when dir_emit stops us it's most likely
529 * doesn't have enough memory, etc. So for next readdir
530 * it will continue.
531 */
532 dout("filldir stopping us...\n");
533 return 0;
534 }
535 ctx->pos++;
536 }
537
538 ceph_mdsc_put_request(dfi->last_readdir);
539 dfi->last_readdir = NULL;
540
541 if (dfi->next_offset > 2) {
542 frag = dfi->frag;
543 goto more;
544 }
545
546 /* more frags? */
547 if (!ceph_frag_is_rightmost(dfi->frag)) {
548 frag = ceph_frag_next(dfi->frag);
549 if (is_hash_order(ctx->pos)) {
550 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
551 dfi->next_offset, true);
552 if (new_pos > ctx->pos)
553 ctx->pos = new_pos;
554 /* keep last_name */
555 } else {
556 ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
557 false);
558 kfree(dfi->last_name);
559 dfi->last_name = NULL;
560 }
561 dout("readdir next frag is %x\n", frag);
562 goto more;
563 }
564 dfi->file_info.flags |= CEPH_F_ATEND;
565
566 /*
567 * if dir_release_count still matches the dir, no dentries
568 * were released during the whole readdir, and we should have
569 * the complete dir contents in our cache.
570 */
571 if (atomic64_read(&ci->i_release_count) ==
572 dfi->dir_release_count) {
573 spin_lock(&ci->i_ceph_lock);
574 if (dfi->dir_ordered_count ==
575 atomic64_read(&ci->i_ordered_count)) {
576 dout(" marking %p complete and ordered\n", inode);
577 /* use i_size to track number of entries in
578 * readdir cache */
579 BUG_ON(dfi->readdir_cache_idx < 0);
580 i_size_write(inode, dfi->readdir_cache_idx *
581 sizeof(struct dentry*));
582 } else {
583 dout(" marking %p complete\n", inode);
584 }
585 __ceph_dir_set_complete(ci, dfi->dir_release_count,
586 dfi->dir_ordered_count);
587 spin_unlock(&ci->i_ceph_lock);
588 }
589
590 dout("readdir %p file %p done.\n", inode, file);
591 return 0;
592}
593
594static void reset_readdir(struct ceph_dir_file_info *dfi)
595{
596 if (dfi->last_readdir) {
597 ceph_mdsc_put_request(dfi->last_readdir);
598 dfi->last_readdir = NULL;
599 }
600 kfree(dfi->last_name);
601 dfi->last_name = NULL;
602 dfi->dir_release_count = 0;
603 dfi->readdir_cache_idx = -1;
604 dfi->next_offset = 2; /* compensate for . and .. */
605 dfi->file_info.flags &= ~CEPH_F_ATEND;
606}
607
608/*
609 * discard buffered readdir content on seekdir(0), or seek to new frag,
610 * or seek prior to current chunk
611 */
612static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
613{
614 struct ceph_mds_reply_info_parsed *rinfo;
615 loff_t chunk_offset;
616 if (new_pos == 0)
617 return true;
618 if (is_hash_order(new_pos)) {
619 /* no need to reset last_name for a forward seek when
620 * dentries are sotred in hash order */
621 } else if (dfi->frag != fpos_frag(new_pos)) {
622 return true;
623 }
624 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
625 if (!rinfo || !rinfo->dir_nr)
626 return true;
627 chunk_offset = rinfo->dir_entries[0].offset;
628 return new_pos < chunk_offset ||
629 is_hash_order(new_pos) != is_hash_order(chunk_offset);
630}
631
632static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
633{
634 struct ceph_dir_file_info *dfi = file->private_data;
635 struct inode *inode = file->f_mapping->host;
636 loff_t retval;
637
638 inode_lock(inode);
639 retval = -EINVAL;
640 switch (whence) {
641 case SEEK_CUR:
642 offset += file->f_pos;
643 break;
644 case SEEK_SET:
645 break;
646 case SEEK_END:
647 retval = -EOPNOTSUPP;
648 goto out;
649 default:
650 goto out;
651 }
652
653 if (offset >= 0) {
654 if (need_reset_readdir(dfi, offset)) {
655 dout("dir_llseek dropping %p content\n", file);
656 reset_readdir(dfi);
657 } else if (is_hash_order(offset) && offset > file->f_pos) {
658 /* for hash offset, we don't know if a forward seek
659 * is within same frag */
660 dfi->dir_release_count = 0;
661 dfi->readdir_cache_idx = -1;
662 }
663
664 if (offset != file->f_pos) {
665 file->f_pos = offset;
666 file->f_version = 0;
667 dfi->file_info.flags &= ~CEPH_F_ATEND;
668 }
669 retval = offset;
670 }
671out:
672 inode_unlock(inode);
673 return retval;
674}
675
676/*
677 * Handle lookups for the hidden .snap directory.
678 */
679struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req,
680 struct dentry *dentry)
681{
682 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
683 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */
684
685 /* .snap dir? */
686 if (ceph_snap(parent) == CEPH_NOSNAP &&
687 strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) {
688 struct dentry *res;
689 struct inode *inode = ceph_get_snapdir(parent);
690
691 res = d_splice_alias(inode, dentry);
692 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p. Spliced dentry %p\n",
693 dentry, dentry, inode, res);
694 if (res)
695 dentry = res;
696 }
697 return dentry;
698}
699
700/*
701 * Figure out final result of a lookup/open request.
702 *
703 * Mainly, make sure we return the final req->r_dentry (if it already
704 * existed) in place of the original VFS-provided dentry when they
705 * differ.
706 *
707 * Gracefully handle the case where the MDS replies with -ENOENT and
708 * no trace (which it may do, at its discretion, e.g., if it doesn't
709 * care to issue a lease on the negative dentry).
710 */
711struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
712 struct dentry *dentry, int err)
713{
714 if (err == -ENOENT) {
715 /* no trace? */
716 err = 0;
717 if (!req->r_reply_info.head->is_dentry) {
718 dout("ENOENT and no trace, dentry %p inode %p\n",
719 dentry, d_inode(dentry));
720 if (d_really_is_positive(dentry)) {
721 d_drop(dentry);
722 err = -ENOENT;
723 } else {
724 d_add(dentry, NULL);
725 }
726 }
727 }
728 if (err)
729 dentry = ERR_PTR(err);
730 else if (dentry != req->r_dentry)
731 dentry = dget(req->r_dentry); /* we got spliced */
732 else
733 dentry = NULL;
734 return dentry;
735}
736
737static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
738{
739 return ceph_ino(inode) == CEPH_INO_ROOT &&
740 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
741}
742
743/*
744 * Look up a single dir entry. If there is a lookup intent, inform
745 * the MDS so that it gets our 'caps wanted' value in a single op.
746 */
747static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
748 unsigned int flags)
749{
750 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
751 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
752 struct ceph_mds_request *req;
753 int op;
754 int mask;
755 int err;
756
757 dout("lookup %p dentry %p '%pd'\n",
758 dir, dentry, dentry);
759
760 if (dentry->d_name.len > NAME_MAX)
761 return ERR_PTR(-ENAMETOOLONG);
762
763 /* can we conclude ENOENT locally? */
764 if (d_really_is_negative(dentry)) {
765 struct ceph_inode_info *ci = ceph_inode(dir);
766 struct ceph_dentry_info *di = ceph_dentry(dentry);
767
768 spin_lock(&ci->i_ceph_lock);
769 dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
770 if (strncmp(dentry->d_name.name,
771 fsc->mount_options->snapdir_name,
772 dentry->d_name.len) &&
773 !is_root_ceph_dentry(dir, dentry) &&
774 ceph_test_mount_opt(fsc, DCACHE) &&
775 __ceph_dir_is_complete(ci) &&
776 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
777 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
778 spin_unlock(&ci->i_ceph_lock);
779 dout(" dir %p complete, -ENOENT\n", dir);
780 d_add(dentry, NULL);
781 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
782 return NULL;
783 }
784 spin_unlock(&ci->i_ceph_lock);
785 }
786
787 op = ceph_snap(dir) == CEPH_SNAPDIR ?
788 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
789 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
790 if (IS_ERR(req))
791 return ERR_CAST(req);
792 req->r_dentry = dget(dentry);
793 req->r_num_caps = 2;
794
795 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
796 if (ceph_security_xattr_wanted(dir))
797 mask |= CEPH_CAP_XATTR_SHARED;
798 req->r_args.getattr.mask = cpu_to_le32(mask);
799
800 ihold(dir);
801 req->r_parent = dir;
802 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
803 err = ceph_mdsc_do_request(mdsc, NULL, req);
804 if (err == -ENOENT) {
805 struct dentry *res;
806
807 res = ceph_handle_snapdir(req, dentry);
808 if (IS_ERR(res)) {
809 err = PTR_ERR(res);
810 } else {
811 dentry = res;
812 err = 0;
813 }
814 }
815 dentry = ceph_finish_lookup(req, dentry, err);
816 ceph_mdsc_put_request(req); /* will dput(dentry) */
817 dout("lookup result=%p\n", dentry);
818 return dentry;
819}
820
821/*
822 * If we do a create but get no trace back from the MDS, follow up with
823 * a lookup (the VFS expects us to link up the provided dentry).
824 */
825int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
826{
827 struct dentry *result = ceph_lookup(dir, dentry, 0);
828
829 if (result && !IS_ERR(result)) {
830 /*
831 * We created the item, then did a lookup, and found
832 * it was already linked to another inode we already
833 * had in our cache (and thus got spliced). To not
834 * confuse VFS (especially when inode is a directory),
835 * we don't link our dentry to that inode, return an
836 * error instead.
837 *
838 * This event should be rare and it happens only when
839 * we talk to old MDS. Recent MDS does not send traceless
840 * reply for request that creates new inode.
841 */
842 d_drop(result);
843 return -ESTALE;
844 }
845 return PTR_ERR(result);
846}
847
848static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir,
849 struct dentry *dentry, umode_t mode, dev_t rdev)
850{
851 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
852 struct ceph_mds_request *req;
853 struct ceph_acl_sec_ctx as_ctx = {};
854 int err;
855
856 if (ceph_snap(dir) != CEPH_NOSNAP)
857 return -EROFS;
858
859 err = ceph_wait_on_conflict_unlink(dentry);
860 if (err)
861 return err;
862
863 if (ceph_quota_is_max_files_exceeded(dir)) {
864 err = -EDQUOT;
865 goto out;
866 }
867
868 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
869 if (err < 0)
870 goto out;
871 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
872 if (err < 0)
873 goto out;
874
875 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
876 dir, dentry, mode, rdev);
877 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
878 if (IS_ERR(req)) {
879 err = PTR_ERR(req);
880 goto out;
881 }
882 req->r_dentry = dget(dentry);
883 req->r_num_caps = 2;
884 req->r_parent = dir;
885 ihold(dir);
886 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
887 req->r_args.mknod.mode = cpu_to_le32(mode);
888 req->r_args.mknod.rdev = cpu_to_le32(rdev);
889 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
890 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
891 if (as_ctx.pagelist) {
892 req->r_pagelist = as_ctx.pagelist;
893 as_ctx.pagelist = NULL;
894 }
895 err = ceph_mdsc_do_request(mdsc, dir, req);
896 if (!err && !req->r_reply_info.head->is_dentry)
897 err = ceph_handle_notrace_create(dir, dentry);
898 ceph_mdsc_put_request(req);
899out:
900 if (!err)
901 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
902 else
903 d_drop(dentry);
904 ceph_release_acl_sec_ctx(&as_ctx);
905 return err;
906}
907
908static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir,
909 struct dentry *dentry, umode_t mode, bool excl)
910{
911 return ceph_mknod(mnt_userns, dir, dentry, mode, 0);
912}
913
914static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir,
915 struct dentry *dentry, const char *dest)
916{
917 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
918 struct ceph_mds_request *req;
919 struct ceph_acl_sec_ctx as_ctx = {};
920 int err;
921
922 if (ceph_snap(dir) != CEPH_NOSNAP)
923 return -EROFS;
924
925 err = ceph_wait_on_conflict_unlink(dentry);
926 if (err)
927 return err;
928
929 if (ceph_quota_is_max_files_exceeded(dir)) {
930 err = -EDQUOT;
931 goto out;
932 }
933
934 err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
935 if (err < 0)
936 goto out;
937
938 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
939 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
940 if (IS_ERR(req)) {
941 err = PTR_ERR(req);
942 goto out;
943 }
944 req->r_path2 = kstrdup(dest, GFP_KERNEL);
945 if (!req->r_path2) {
946 err = -ENOMEM;
947 ceph_mdsc_put_request(req);
948 goto out;
949 }
950 req->r_parent = dir;
951 ihold(dir);
952
953 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
954 req->r_dentry = dget(dentry);
955 req->r_num_caps = 2;
956 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
957 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
958 if (as_ctx.pagelist) {
959 req->r_pagelist = as_ctx.pagelist;
960 as_ctx.pagelist = NULL;
961 }
962 err = ceph_mdsc_do_request(mdsc, dir, req);
963 if (!err && !req->r_reply_info.head->is_dentry)
964 err = ceph_handle_notrace_create(dir, dentry);
965 ceph_mdsc_put_request(req);
966out:
967 if (err)
968 d_drop(dentry);
969 ceph_release_acl_sec_ctx(&as_ctx);
970 return err;
971}
972
973static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
974 struct dentry *dentry, umode_t mode)
975{
976 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
977 struct ceph_mds_request *req;
978 struct ceph_acl_sec_ctx as_ctx = {};
979 int err;
980 int op;
981
982 err = ceph_wait_on_conflict_unlink(dentry);
983 if (err)
984 return err;
985
986 if (ceph_snap(dir) == CEPH_SNAPDIR) {
987 /* mkdir .snap/foo is a MKSNAP */
988 op = CEPH_MDS_OP_MKSNAP;
989 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
990 dentry, dentry);
991 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
992 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
993 op = CEPH_MDS_OP_MKDIR;
994 } else {
995 err = -EROFS;
996 goto out;
997 }
998
999 if (op == CEPH_MDS_OP_MKDIR &&
1000 ceph_quota_is_max_files_exceeded(dir)) {
1001 err = -EDQUOT;
1002 goto out;
1003 }
1004
1005 mode |= S_IFDIR;
1006 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
1007 if (err < 0)
1008 goto out;
1009 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
1010 if (err < 0)
1011 goto out;
1012
1013 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1014 if (IS_ERR(req)) {
1015 err = PTR_ERR(req);
1016 goto out;
1017 }
1018
1019 req->r_dentry = dget(dentry);
1020 req->r_num_caps = 2;
1021 req->r_parent = dir;
1022 ihold(dir);
1023 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1024 req->r_args.mkdir.mode = cpu_to_le32(mode);
1025 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
1026 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1027 if (as_ctx.pagelist) {
1028 req->r_pagelist = as_ctx.pagelist;
1029 as_ctx.pagelist = NULL;
1030 }
1031 err = ceph_mdsc_do_request(mdsc, dir, req);
1032 if (!err &&
1033 !req->r_reply_info.head->is_target &&
1034 !req->r_reply_info.head->is_dentry)
1035 err = ceph_handle_notrace_create(dir, dentry);
1036 ceph_mdsc_put_request(req);
1037out:
1038 if (!err)
1039 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
1040 else
1041 d_drop(dentry);
1042 ceph_release_acl_sec_ctx(&as_ctx);
1043 return err;
1044}
1045
1046static int ceph_link(struct dentry *old_dentry, struct inode *dir,
1047 struct dentry *dentry)
1048{
1049 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
1050 struct ceph_mds_request *req;
1051 int err;
1052
1053 err = ceph_wait_on_conflict_unlink(dentry);
1054 if (err)
1055 return err;
1056
1057 if (ceph_snap(dir) != CEPH_NOSNAP)
1058 return -EROFS;
1059
1060 dout("link in dir %p old_dentry %p dentry %p\n", dir,
1061 old_dentry, dentry);
1062 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1063 if (IS_ERR(req)) {
1064 d_drop(dentry);
1065 return PTR_ERR(req);
1066 }
1067 req->r_dentry = dget(dentry);
1068 req->r_num_caps = 2;
1069 req->r_old_dentry = dget(old_dentry);
1070 req->r_parent = dir;
1071 ihold(dir);
1072 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1073 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1074 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1075 /* release LINK_SHARED on source inode (mds will lock it) */
1076 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1077 err = ceph_mdsc_do_request(mdsc, dir, req);
1078 if (err) {
1079 d_drop(dentry);
1080 } else if (!req->r_reply_info.head->is_dentry) {
1081 ihold(d_inode(old_dentry));
1082 d_instantiate(dentry, d_inode(old_dentry));
1083 }
1084 ceph_mdsc_put_request(req);
1085 return err;
1086}
1087
1088static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
1089 struct ceph_mds_request *req)
1090{
1091 struct dentry *dentry = req->r_dentry;
1092 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1093 struct ceph_dentry_info *di = ceph_dentry(dentry);
1094 int result = req->r_err ? req->r_err :
1095 le32_to_cpu(req->r_reply_info.head->result);
1096
1097 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
1098 pr_warn("%s dentry %p:%pd async unlink bit is not set\n",
1099 __func__, dentry, dentry);
1100
1101 spin_lock(&fsc->async_unlink_conflict_lock);
1102 hash_del_rcu(&di->hnode);
1103 spin_unlock(&fsc->async_unlink_conflict_lock);
1104
1105 spin_lock(&dentry->d_lock);
1106 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
1107 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT);
1108 spin_unlock(&dentry->d_lock);
1109
1110 synchronize_rcu();
1111
1112 if (result == -EJUKEBOX)
1113 goto out;
1114
1115 /* If op failed, mark everyone involved for errors */
1116 if (result) {
1117 int pathlen = 0;
1118 u64 base = 0;
1119 char *path = ceph_mdsc_build_path(dentry, &pathlen,
1120 &base, 0);
1121
1122 /* mark error on parent + clear complete */
1123 mapping_set_error(req->r_parent->i_mapping, result);
1124 ceph_dir_clear_complete(req->r_parent);
1125
1126 /* drop the dentry -- we don't know its status */
1127 if (!d_unhashed(dentry))
1128 d_drop(dentry);
1129
1130 /* mark inode itself for an error (since metadata is bogus) */
1131 mapping_set_error(req->r_old_inode->i_mapping, result);
1132
1133 pr_warn("async unlink failure path=(%llx)%s result=%d!\n",
1134 base, IS_ERR(path) ? "<<bad>>" : path, result);
1135 ceph_mdsc_free_path(path, pathlen);
1136 }
1137out:
1138 iput(req->r_old_inode);
1139 ceph_mdsc_release_dir_caps(req);
1140}
1141
1142static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
1143{
1144 struct ceph_inode_info *ci = ceph_inode(dir);
1145 struct ceph_dentry_info *di;
1146 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
1147
1148 spin_lock(&ci->i_ceph_lock);
1149 if ((__ceph_caps_issued(ci, NULL) & want) == want) {
1150 ceph_take_cap_refs(ci, want, false);
1151 got = want;
1152 }
1153 spin_unlock(&ci->i_ceph_lock);
1154
1155 /* If we didn't get anything, return 0 */
1156 if (!got)
1157 return 0;
1158
1159 spin_lock(&dentry->d_lock);
1160 di = ceph_dentry(dentry);
1161 /*
1162 * - We are holding Fx, which implies Fs caps.
1163 * - Only support async unlink for primary linkage
1164 */
1165 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
1166 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
1167 want = 0;
1168 spin_unlock(&dentry->d_lock);
1169
1170 /* Do we still want what we've got? */
1171 if (want == got)
1172 return got;
1173
1174 ceph_put_cap_refs(ci, got);
1175 return 0;
1176}
1177
1178/*
1179 * rmdir and unlink are differ only by the metadata op code
1180 */
1181static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1182{
1183 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1184 struct ceph_mds_client *mdsc = fsc->mdsc;
1185 struct inode *inode = d_inode(dentry);
1186 struct ceph_mds_request *req;
1187 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
1188 int err = -EROFS;
1189 int op;
1190
1191 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1192 /* rmdir .snap/foo is RMSNAP */
1193 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1194 op = CEPH_MDS_OP_RMSNAP;
1195 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1196 dout("unlink/rmdir dir %p dn %p inode %p\n",
1197 dir, dentry, inode);
1198 op = d_is_dir(dentry) ?
1199 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1200 } else
1201 goto out;
1202retry:
1203 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1204 if (IS_ERR(req)) {
1205 err = PTR_ERR(req);
1206 goto out;
1207 }
1208 req->r_dentry = dget(dentry);
1209 req->r_num_caps = 2;
1210 req->r_parent = dir;
1211 ihold(dir);
1212 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1213 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1214 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1215
1216 if (try_async && op == CEPH_MDS_OP_UNLINK &&
1217 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
1218 struct ceph_dentry_info *di = ceph_dentry(dentry);
1219
1220 dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir),
1221 dentry->d_name.len, dentry->d_name.name,
1222 ceph_cap_string(req->r_dir_caps));
1223 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
1224 req->r_callback = ceph_async_unlink_cb;
1225 req->r_old_inode = d_inode(dentry);
1226 ihold(req->r_old_inode);
1227
1228 spin_lock(&dentry->d_lock);
1229 di->flags |= CEPH_DENTRY_ASYNC_UNLINK;
1230 spin_unlock(&dentry->d_lock);
1231
1232 spin_lock(&fsc->async_unlink_conflict_lock);
1233 hash_add_rcu(fsc->async_unlink_conflict, &di->hnode,
1234 dentry->d_name.hash);
1235 spin_unlock(&fsc->async_unlink_conflict_lock);
1236
1237 err = ceph_mdsc_submit_request(mdsc, dir, req);
1238 if (!err) {
1239 /*
1240 * We have enough caps, so we assume that the unlink
1241 * will succeed. Fix up the target inode and dcache.
1242 */
1243 drop_nlink(inode);
1244 d_delete(dentry);
1245 } else {
1246 spin_lock(&fsc->async_unlink_conflict_lock);
1247 hash_del_rcu(&di->hnode);
1248 spin_unlock(&fsc->async_unlink_conflict_lock);
1249
1250 spin_lock(&dentry->d_lock);
1251 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;
1252 spin_unlock(&dentry->d_lock);
1253
1254 if (err == -EJUKEBOX) {
1255 try_async = false;
1256 ceph_mdsc_put_request(req);
1257 goto retry;
1258 }
1259 }
1260 } else {
1261 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1262 err = ceph_mdsc_do_request(mdsc, dir, req);
1263 if (!err && !req->r_reply_info.head->is_dentry)
1264 d_delete(dentry);
1265 }
1266
1267 ceph_mdsc_put_request(req);
1268out:
1269 return err;
1270}
1271
1272static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1273 struct dentry *old_dentry, struct inode *new_dir,
1274 struct dentry *new_dentry, unsigned int flags)
1275{
1276 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);
1277 struct ceph_mds_request *req;
1278 int op = CEPH_MDS_OP_RENAME;
1279 int err;
1280
1281 if (flags)
1282 return -EINVAL;
1283
1284 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1285 return -EXDEV;
1286 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1287 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1288 op = CEPH_MDS_OP_RENAMESNAP;
1289 else
1290 return -EROFS;
1291 }
1292 /* don't allow cross-quota renames */
1293 if ((old_dir != new_dir) &&
1294 (!ceph_quota_is_same_realm(old_dir, new_dir)))
1295 return -EXDEV;
1296
1297 err = ceph_wait_on_conflict_unlink(new_dentry);
1298 if (err)
1299 return err;
1300
1301 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1302 old_dir, old_dentry, new_dir, new_dentry);
1303 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1304 if (IS_ERR(req))
1305 return PTR_ERR(req);
1306 ihold(old_dir);
1307 req->r_dentry = dget(new_dentry);
1308 req->r_num_caps = 2;
1309 req->r_old_dentry = dget(old_dentry);
1310 req->r_old_dentry_dir = old_dir;
1311 req->r_parent = new_dir;
1312 ihold(new_dir);
1313 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1314 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1315 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1316 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1317 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1318 /* release LINK_RDCACHE on source inode (mds will lock it) */
1319 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1320 if (d_really_is_positive(new_dentry)) {
1321 req->r_inode_drop =
1322 ceph_drop_caps_for_unlink(d_inode(new_dentry));
1323 }
1324 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1325 if (!err && !req->r_reply_info.head->is_dentry) {
1326 /*
1327 * Normally d_move() is done by fill_trace (called by
1328 * do_request, above). If there is no trace, we need
1329 * to do it here.
1330 */
1331 d_move(old_dentry, new_dentry);
1332 }
1333 ceph_mdsc_put_request(req);
1334 return err;
1335}
1336
1337/*
1338 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1339 * Leases at front of the list will expire first. (Assume all leases have
1340 * similar duration)
1341 *
1342 * Called under dentry->d_lock.
1343 */
1344void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1345{
1346 struct dentry *dn = di->dentry;
1347 struct ceph_mds_client *mdsc;
1348
1349 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1350
1351 di->flags |= CEPH_DENTRY_LEASE_LIST;
1352 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1353 di->flags |= CEPH_DENTRY_REFERENCED;
1354 return;
1355 }
1356
1357 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1358 spin_lock(&mdsc->dentry_list_lock);
1359 list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1360 spin_unlock(&mdsc->dentry_list_lock);
1361}
1362
1363static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1364 struct ceph_dentry_info *di)
1365{
1366 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1367 di->lease_gen = 0;
1368 di->time = jiffies;
1369 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1370}
1371
1372/*
1373 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1374 * list if it's not in the list, otherwise set 'referenced' flag.
1375 *
1376 * Called under dentry->d_lock.
1377 */
1378void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1379{
1380 struct dentry *dn = di->dentry;
1381 struct ceph_mds_client *mdsc;
1382
1383 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
1384 di, dn, dn, di->offset);
1385
1386 if (!list_empty(&di->lease_list)) {
1387 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1388 /* don't remove dentry from dentry lease list
1389 * if its lease is valid */
1390 if (__dentry_lease_is_valid(di))
1391 return;
1392 } else {
1393 di->flags |= CEPH_DENTRY_REFERENCED;
1394 return;
1395 }
1396 }
1397
1398 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1399 di->flags |= CEPH_DENTRY_REFERENCED;
1400 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1401 return;
1402 }
1403
1404 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1405 spin_lock(&mdsc->dentry_list_lock);
1406 __dentry_dir_lease_touch(mdsc, di),
1407 spin_unlock(&mdsc->dentry_list_lock);
1408}
1409
1410static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1411{
1412 struct ceph_mds_client *mdsc;
1413 if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1414 return;
1415 if (list_empty(&di->lease_list))
1416 return;
1417
1418 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1419 spin_lock(&mdsc->dentry_list_lock);
1420 list_del_init(&di->lease_list);
1421 spin_unlock(&mdsc->dentry_list_lock);
1422}
1423
1424enum {
1425 KEEP = 0,
1426 DELETE = 1,
1427 TOUCH = 2,
1428 STOP = 4,
1429};
1430
1431struct ceph_lease_walk_control {
1432 bool dir_lease;
1433 bool expire_dir_lease;
1434 unsigned long nr_to_scan;
1435 unsigned long dir_lease_ttl;
1436};
1437
1438static unsigned long
1439__dentry_leases_walk(struct ceph_mds_client *mdsc,
1440 struct ceph_lease_walk_control *lwc,
1441 int (*check)(struct dentry*, void*))
1442{
1443 struct ceph_dentry_info *di, *tmp;
1444 struct dentry *dentry, *last = NULL;
1445 struct list_head* list;
1446 LIST_HEAD(dispose);
1447 unsigned long freed = 0;
1448 int ret = 0;
1449
1450 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1451 spin_lock(&mdsc->dentry_list_lock);
1452 list_for_each_entry_safe(di, tmp, list, lease_list) {
1453 if (!lwc->nr_to_scan)
1454 break;
1455 --lwc->nr_to_scan;
1456
1457 dentry = di->dentry;
1458 if (last == dentry)
1459 break;
1460
1461 if (!spin_trylock(&dentry->d_lock))
1462 continue;
1463
1464 if (__lockref_is_dead(&dentry->d_lockref)) {
1465 list_del_init(&di->lease_list);
1466 goto next;
1467 }
1468
1469 ret = check(dentry, lwc);
1470 if (ret & TOUCH) {
1471 /* move it into tail of dir lease list */
1472 __dentry_dir_lease_touch(mdsc, di);
1473 if (!last)
1474 last = dentry;
1475 }
1476 if (ret & DELETE) {
1477 /* stale lease */
1478 di->flags &= ~CEPH_DENTRY_REFERENCED;
1479 if (dentry->d_lockref.count > 0) {
1480 /* update_dentry_lease() will re-add
1481 * it to lease list, or
1482 * ceph_d_delete() will return 1 when
1483 * last reference is dropped */
1484 list_del_init(&di->lease_list);
1485 } else {
1486 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1487 list_move_tail(&di->lease_list, &dispose);
1488 dget_dlock(dentry);
1489 }
1490 }
1491next:
1492 spin_unlock(&dentry->d_lock);
1493 if (ret & STOP)
1494 break;
1495 }
1496 spin_unlock(&mdsc->dentry_list_lock);
1497
1498 while (!list_empty(&dispose)) {
1499 di = list_first_entry(&dispose, struct ceph_dentry_info,
1500 lease_list);
1501 dentry = di->dentry;
1502 spin_lock(&dentry->d_lock);
1503
1504 list_del_init(&di->lease_list);
1505 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1506 if (di->flags & CEPH_DENTRY_REFERENCED) {
1507 spin_lock(&mdsc->dentry_list_lock);
1508 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1509 list_add_tail(&di->lease_list,
1510 &mdsc->dentry_leases);
1511 } else {
1512 __dentry_dir_lease_touch(mdsc, di);
1513 }
1514 spin_unlock(&mdsc->dentry_list_lock);
1515 } else {
1516 freed++;
1517 }
1518
1519 spin_unlock(&dentry->d_lock);
1520 /* ceph_d_delete() does the trick */
1521 dput(dentry);
1522 }
1523 return freed;
1524}
1525
1526static int __dentry_lease_check(struct dentry *dentry, void *arg)
1527{
1528 struct ceph_dentry_info *di = ceph_dentry(dentry);
1529 int ret;
1530
1531 if (__dentry_lease_is_valid(di))
1532 return STOP;
1533 ret = __dir_lease_try_check(dentry);
1534 if (ret == -EBUSY)
1535 return KEEP;
1536 if (ret > 0)
1537 return TOUCH;
1538 return DELETE;
1539}
1540
1541static int __dir_lease_check(struct dentry *dentry, void *arg)
1542{
1543 struct ceph_lease_walk_control *lwc = arg;
1544 struct ceph_dentry_info *di = ceph_dentry(dentry);
1545
1546 int ret = __dir_lease_try_check(dentry);
1547 if (ret == -EBUSY)
1548 return KEEP;
1549 if (ret > 0) {
1550 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1551 return STOP;
1552 /* Move dentry to tail of dir lease list if we don't want
1553 * to delete it. So dentries in the list are checked in a
1554 * round robin manner */
1555 if (!lwc->expire_dir_lease)
1556 return TOUCH;
1557 if (dentry->d_lockref.count > 0 ||
1558 (di->flags & CEPH_DENTRY_REFERENCED))
1559 return TOUCH;
1560 /* invalidate dir lease */
1561 di->lease_shared_gen = 0;
1562 }
1563 return DELETE;
1564}
1565
1566int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1567{
1568 struct ceph_lease_walk_control lwc;
1569 unsigned long count;
1570 unsigned long freed;
1571
1572 spin_lock(&mdsc->caps_list_lock);
1573 if (mdsc->caps_use_max > 0 &&
1574 mdsc->caps_use_count > mdsc->caps_use_max)
1575 count = mdsc->caps_use_count - mdsc->caps_use_max;
1576 else
1577 count = 0;
1578 spin_unlock(&mdsc->caps_list_lock);
1579
1580 lwc.dir_lease = false;
1581 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
1582 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1583 if (!lwc.nr_to_scan) /* more invalid leases */
1584 return -EAGAIN;
1585
1586 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1587 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1588
1589 lwc.dir_lease = true;
1590 lwc.expire_dir_lease = freed < count;
1591 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1592 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1593 if (!lwc.nr_to_scan) /* more to check */
1594 return -EAGAIN;
1595
1596 return freed > 0 ? 1 : 0;
1597}
1598
1599/*
1600 * Ensure a dentry lease will no longer revalidate.
1601 */
1602void ceph_invalidate_dentry_lease(struct dentry *dentry)
1603{
1604 struct ceph_dentry_info *di = ceph_dentry(dentry);
1605 spin_lock(&dentry->d_lock);
1606 di->time = jiffies;
1607 di->lease_shared_gen = 0;
1608 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1609 __dentry_lease_unlist(di);
1610 spin_unlock(&dentry->d_lock);
1611}
1612
1613/*
1614 * Check if dentry lease is valid. If not, delete the lease. Try to
1615 * renew if the least is more than half up.
1616 */
1617static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1618{
1619 struct ceph_mds_session *session;
1620
1621 if (!di->lease_gen)
1622 return false;
1623
1624 session = di->lease_session;
1625 if (session) {
1626 u32 gen;
1627 unsigned long ttl;
1628
1629 gen = atomic_read(&session->s_cap_gen);
1630 ttl = session->s_cap_ttl;
1631
1632 if (di->lease_gen == gen &&
1633 time_before(jiffies, ttl) &&
1634 time_before(jiffies, di->time))
1635 return true;
1636 }
1637 di->lease_gen = 0;
1638 return false;
1639}
1640
1641static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
1642{
1643 struct ceph_dentry_info *di;
1644 struct ceph_mds_session *session = NULL;
1645 u32 seq = 0;
1646 int valid = 0;
1647
1648 spin_lock(&dentry->d_lock);
1649 di = ceph_dentry(dentry);
1650 if (di && __dentry_lease_is_valid(di)) {
1651 valid = 1;
1652
1653 if (di->lease_renew_after &&
1654 time_after(jiffies, di->lease_renew_after)) {
1655 /*
1656 * We should renew. If we're in RCU walk mode
1657 * though, we can't do that so just return
1658 * -ECHILD.
1659 */
1660 if (flags & LOOKUP_RCU) {
1661 valid = -ECHILD;
1662 } else {
1663 session = ceph_get_mds_session(di->lease_session);
1664 seq = di->lease_seq;
1665 di->lease_renew_after = 0;
1666 di->lease_renew_from = jiffies;
1667 }
1668 }
1669 }
1670 spin_unlock(&dentry->d_lock);
1671
1672 if (session) {
1673 ceph_mdsc_lease_send_msg(session, dentry,
1674 CEPH_MDS_LEASE_RENEW, seq);
1675 ceph_put_mds_session(session);
1676 }
1677 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1678 return valid;
1679}
1680
1681/*
1682 * Called under dentry->d_lock.
1683 */
1684static int __dir_lease_try_check(const struct dentry *dentry)
1685{
1686 struct ceph_dentry_info *di = ceph_dentry(dentry);
1687 struct inode *dir;
1688 struct ceph_inode_info *ci;
1689 int valid = 0;
1690
1691 if (!di->lease_shared_gen)
1692 return 0;
1693 if (IS_ROOT(dentry))
1694 return 0;
1695
1696 dir = d_inode(dentry->d_parent);
1697 ci = ceph_inode(dir);
1698
1699 if (spin_trylock(&ci->i_ceph_lock)) {
1700 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1701 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1702 valid = 1;
1703 spin_unlock(&ci->i_ceph_lock);
1704 } else {
1705 valid = -EBUSY;
1706 }
1707
1708 if (!valid)
1709 di->lease_shared_gen = 0;
1710 return valid;
1711}
1712
1713/*
1714 * Check if directory-wide content lease/cap is valid.
1715 */
1716static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
1717 struct ceph_mds_client *mdsc)
1718{
1719 struct ceph_inode_info *ci = ceph_inode(dir);
1720 int valid;
1721 int shared_gen;
1722
1723 spin_lock(&ci->i_ceph_lock);
1724 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1725 if (valid) {
1726 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
1727 shared_gen = atomic_read(&ci->i_shared_gen);
1728 }
1729 spin_unlock(&ci->i_ceph_lock);
1730 if (valid) {
1731 struct ceph_dentry_info *di;
1732 spin_lock(&dentry->d_lock);
1733 di = ceph_dentry(dentry);
1734 if (dir == d_inode(dentry->d_parent) &&
1735 di && di->lease_shared_gen == shared_gen)
1736 __ceph_dentry_dir_lease_touch(di);
1737 else
1738 valid = 0;
1739 spin_unlock(&dentry->d_lock);
1740 }
1741 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
1742 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
1743 return valid;
1744}
1745
1746/*
1747 * Check if cached dentry can be trusted.
1748 */
1749static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1750{
1751 int valid = 0;
1752 struct dentry *parent;
1753 struct inode *dir, *inode;
1754 struct ceph_mds_client *mdsc;
1755
1756 if (flags & LOOKUP_RCU) {
1757 parent = READ_ONCE(dentry->d_parent);
1758 dir = d_inode_rcu(parent);
1759 if (!dir)
1760 return -ECHILD;
1761 inode = d_inode_rcu(dentry);
1762 } else {
1763 parent = dget_parent(dentry);
1764 dir = d_inode(parent);
1765 inode = d_inode(dentry);
1766 }
1767
1768 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
1769 dentry, inode, ceph_dentry(dentry)->offset);
1770
1771 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
1772
1773 /* always trust cached snapped dentries, snapdir dentry */
1774 if (ceph_snap(dir) != CEPH_NOSNAP) {
1775 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1776 dentry, inode);
1777 valid = 1;
1778 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1779 valid = 1;
1780 } else {
1781 valid = dentry_lease_is_valid(dentry, flags);
1782 if (valid == -ECHILD)
1783 return valid;
1784 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
1785 if (inode)
1786 valid = ceph_is_any_caps(inode);
1787 else
1788 valid = 1;
1789 }
1790 }
1791
1792 if (!valid) {
1793 struct ceph_mds_request *req;
1794 int op, err;
1795 u32 mask;
1796
1797 if (flags & LOOKUP_RCU)
1798 return -ECHILD;
1799
1800 percpu_counter_inc(&mdsc->metric.d_lease_mis);
1801
1802 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1803 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1804 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1805 if (!IS_ERR(req)) {
1806 req->r_dentry = dget(dentry);
1807 req->r_num_caps = 2;
1808 req->r_parent = dir;
1809 ihold(dir);
1810
1811 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1812 if (ceph_security_xattr_wanted(dir))
1813 mask |= CEPH_CAP_XATTR_SHARED;
1814 req->r_args.getattr.mask = cpu_to_le32(mask);
1815
1816 err = ceph_mdsc_do_request(mdsc, NULL, req);
1817 switch (err) {
1818 case 0:
1819 if (d_really_is_positive(dentry) &&
1820 d_inode(dentry) == req->r_target_inode)
1821 valid = 1;
1822 break;
1823 case -ENOENT:
1824 if (d_really_is_negative(dentry))
1825 valid = 1;
1826 fallthrough;
1827 default:
1828 break;
1829 }
1830 ceph_mdsc_put_request(req);
1831 dout("d_revalidate %p lookup result=%d\n",
1832 dentry, err);
1833 }
1834 } else {
1835 percpu_counter_inc(&mdsc->metric.d_lease_hit);
1836 }
1837
1838 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1839 if (!valid)
1840 ceph_dir_clear_complete(dir);
1841
1842 if (!(flags & LOOKUP_RCU))
1843 dput(parent);
1844 return valid;
1845}
1846
1847/*
1848 * Delete unused dentry that doesn't have valid lease
1849 *
1850 * Called under dentry->d_lock.
1851 */
1852static int ceph_d_delete(const struct dentry *dentry)
1853{
1854 struct ceph_dentry_info *di;
1855
1856 /* won't release caps */
1857 if (d_really_is_negative(dentry))
1858 return 0;
1859 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1860 return 0;
1861 /* vaild lease? */
1862 di = ceph_dentry(dentry);
1863 if (di) {
1864 if (__dentry_lease_is_valid(di))
1865 return 0;
1866 if (__dir_lease_try_check(dentry))
1867 return 0;
1868 }
1869 return 1;
1870}
1871
1872/*
1873 * Release our ceph_dentry_info.
1874 */
1875static void ceph_d_release(struct dentry *dentry)
1876{
1877 struct ceph_dentry_info *di = ceph_dentry(dentry);
1878 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1879
1880 dout("d_release %p\n", dentry);
1881
1882 atomic64_dec(&fsc->mdsc->metric.total_dentries);
1883
1884 spin_lock(&dentry->d_lock);
1885 __dentry_lease_unlist(di);
1886 dentry->d_fsdata = NULL;
1887 spin_unlock(&dentry->d_lock);
1888
1889 ceph_put_mds_session(di->lease_session);
1890 kmem_cache_free(ceph_dentry_cachep, di);
1891}
1892
1893/*
1894 * When the VFS prunes a dentry from the cache, we need to clear the
1895 * complete flag on the parent directory.
1896 *
1897 * Called under dentry->d_lock.
1898 */
1899static void ceph_d_prune(struct dentry *dentry)
1900{
1901 struct ceph_inode_info *dir_ci;
1902 struct ceph_dentry_info *di;
1903
1904 dout("ceph_d_prune %pd %p\n", dentry, dentry);
1905
1906 /* do we have a valid parent? */
1907 if (IS_ROOT(dentry))
1908 return;
1909
1910 /* we hold d_lock, so d_parent is stable */
1911 dir_ci = ceph_inode(d_inode(dentry->d_parent));
1912 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1913 return;
1914
1915 /* who calls d_delete() should also disable dcache readdir */
1916 if (d_really_is_negative(dentry))
1917 return;
1918
1919 /* d_fsdata does not get cleared until d_release */
1920 if (!d_unhashed(dentry)) {
1921 __ceph_dir_clear_complete(dir_ci);
1922 return;
1923 }
1924
1925 /* Disable dcache readdir just in case that someone called d_drop()
1926 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1927 * properly (dcache readdir is still enabled) */
1928 di = ceph_dentry(dentry);
1929 if (di->offset > 0 &&
1930 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1931 __ceph_dir_clear_ordered(dir_ci);
1932}
1933
1934/*
1935 * read() on a dir. This weird interface hack only works if mounted
1936 * with '-o dirstat'.
1937 */
1938static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1939 loff_t *ppos)
1940{
1941 struct ceph_dir_file_info *dfi = file->private_data;
1942 struct inode *inode = file_inode(file);
1943 struct ceph_inode_info *ci = ceph_inode(inode);
1944 int left;
1945 const int bufsize = 1024;
1946
1947 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1948 return -EISDIR;
1949
1950 if (!dfi->dir_info) {
1951 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1952 if (!dfi->dir_info)
1953 return -ENOMEM;
1954 dfi->dir_info_len =
1955 snprintf(dfi->dir_info, bufsize,
1956 "entries: %20lld\n"
1957 " files: %20lld\n"
1958 " subdirs: %20lld\n"
1959 "rentries: %20lld\n"
1960 " rfiles: %20lld\n"
1961 " rsubdirs: %20lld\n"
1962 "rbytes: %20lld\n"
1963 "rctime: %10lld.%09ld\n",
1964 ci->i_files + ci->i_subdirs,
1965 ci->i_files,
1966 ci->i_subdirs,
1967 ci->i_rfiles + ci->i_rsubdirs,
1968 ci->i_rfiles,
1969 ci->i_rsubdirs,
1970 ci->i_rbytes,
1971 ci->i_rctime.tv_sec,
1972 ci->i_rctime.tv_nsec);
1973 }
1974
1975 if (*ppos >= dfi->dir_info_len)
1976 return 0;
1977 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1978 left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1979 if (left == size)
1980 return -EFAULT;
1981 *ppos += (size - left);
1982 return size - left;
1983}
1984
1985
1986
1987/*
1988 * Return name hash for a given dentry. This is dependent on
1989 * the parent directory's hash function.
1990 */
1991unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1992{
1993 struct ceph_inode_info *dci = ceph_inode(dir);
1994 unsigned hash;
1995
1996 switch (dci->i_dir_layout.dl_dir_hash) {
1997 case 0: /* for backward compat */
1998 case CEPH_STR_HASH_LINUX:
1999 return dn->d_name.hash;
2000
2001 default:
2002 spin_lock(&dn->d_lock);
2003 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
2004 dn->d_name.name, dn->d_name.len);
2005 spin_unlock(&dn->d_lock);
2006 return hash;
2007 }
2008}
2009
2010const struct file_operations ceph_dir_fops = {
2011 .read = ceph_read_dir,
2012 .iterate = ceph_readdir,
2013 .llseek = ceph_dir_llseek,
2014 .open = ceph_open,
2015 .release = ceph_release,
2016 .unlocked_ioctl = ceph_ioctl,
2017 .compat_ioctl = compat_ptr_ioctl,
2018 .fsync = ceph_fsync,
2019 .lock = ceph_lock,
2020 .flock = ceph_flock,
2021};
2022
2023const struct file_operations ceph_snapdir_fops = {
2024 .iterate = ceph_readdir,
2025 .llseek = ceph_dir_llseek,
2026 .open = ceph_open,
2027 .release = ceph_release,
2028};
2029
2030const struct inode_operations ceph_dir_iops = {
2031 .lookup = ceph_lookup,
2032 .permission = ceph_permission,
2033 .getattr = ceph_getattr,
2034 .setattr = ceph_setattr,
2035 .listxattr = ceph_listxattr,
2036 .get_inode_acl = ceph_get_acl,
2037 .set_acl = ceph_set_acl,
2038 .mknod = ceph_mknod,
2039 .symlink = ceph_symlink,
2040 .mkdir = ceph_mkdir,
2041 .link = ceph_link,
2042 .unlink = ceph_unlink,
2043 .rmdir = ceph_unlink,
2044 .rename = ceph_rename,
2045 .create = ceph_create,
2046 .atomic_open = ceph_atomic_open,
2047};
2048
2049const struct inode_operations ceph_snapdir_iops = {
2050 .lookup = ceph_lookup,
2051 .permission = ceph_permission,
2052 .getattr = ceph_getattr,
2053 .mkdir = ceph_mkdir,
2054 .rmdir = ceph_unlink,
2055 .rename = ceph_rename,
2056};
2057
2058const struct dentry_operations ceph_dentry_ops = {
2059 .d_revalidate = ceph_d_revalidate,
2060 .d_delete = ceph_d_delete,
2061 .d_release = ceph_d_release,
2062 .d_prune = ceph_d_prune,
2063 .d_init = ceph_d_init,
2064};