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
14
15
16
17
18
19
20
21
22
23
24
25
26
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
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;
46
47 spin_lock(&dentry->d_lock);
48 if (dentry->d_fsdata) {
49
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
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
92
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
103
104
105
106
107
108
109
110
111
112
113
114static int __dcache_readdir(struct file *file, struct dir_context *ctx)
115{
116 struct ceph_file_info *fi = file->private_data;
117 struct dentry *parent = file->f_dentry;
118 struct inode *dir = parent->d_inode;
119 struct list_head *p;
120 struct dentry *dentry, *last;
121 struct ceph_dentry_info *di;
122 int err = 0;
123
124
125 last = fi->dentry;
126 fi->dentry = NULL;
127
128 dout("__dcache_readdir %p at %llu (last %p)\n", dir, ctx->pos,
129 last);
130
131 spin_lock(&parent->d_lock);
132
133
134 if (ctx->pos == 2 || last == NULL ||
135 ctx->pos < ceph_dentry(last)->offset) {
136 if (list_empty(&parent->d_subdirs))
137 goto out_unlock;
138 p = parent->d_subdirs.prev;
139 dout(" initial p %p/%p\n", p->prev, p->next);
140 } else {
141 p = last->d_u.d_child.prev;
142 }
143
144more:
145 dentry = list_entry(p, struct dentry, d_u.d_child);
146 di = ceph_dentry(dentry);
147 while (1) {
148 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
149 d_unhashed(dentry) ? "!hashed" : "hashed",
150 parent->d_subdirs.prev, parent->d_subdirs.next);
151 if (p == &parent->d_subdirs) {
152 fi->flags |= CEPH_F_ATEND;
153 goto out_unlock;
154 }
155 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
156 if (!d_unhashed(dentry) && dentry->d_inode &&
157 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
158 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
159 ctx->pos <= di->offset)
160 break;
161 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
162 dentry->d_name.len, dentry->d_name.name, di->offset,
163 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
164 !dentry->d_inode ? " null" : "");
165 spin_unlock(&dentry->d_lock);
166 p = p->prev;
167 dentry = list_entry(p, struct dentry, d_u.d_child);
168 di = ceph_dentry(dentry);
169 }
170
171 dget_dlock(dentry);
172 spin_unlock(&dentry->d_lock);
173 spin_unlock(&parent->d_lock);
174
175 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos,
176 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
177 ctx->pos = di->offset;
178 if (!dir_emit(ctx, dentry->d_name.name,
179 dentry->d_name.len,
180 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
181 dentry->d_inode->i_mode >> 12)) {
182 if (last) {
183
184 fi->dentry = last;
185 fi->next_offset = di->offset;
186 }
187 dput(dentry);
188 return 0;
189 }
190
191 if (last)
192 dput(last);
193 last = dentry;
194
195 ctx->pos++;
196
197
198 if (!ceph_dir_is_complete(dir)) {
199 dout(" lost dir complete on %p; falling back to mds\n", dir);
200 err = -EAGAIN;
201 goto out;
202 }
203
204 spin_lock(&parent->d_lock);
205 p = p->prev;
206 goto more;
207
208out_unlock:
209 spin_unlock(&parent->d_lock);
210out:
211 if (last)
212 dput(last);
213 return err;
214}
215
216
217
218
219
220
221
222static int note_last_dentry(struct ceph_file_info *fi, const char *name,
223 int len)
224{
225 kfree(fi->last_name);
226 fi->last_name = kmalloc(len+1, GFP_NOFS);
227 if (!fi->last_name)
228 return -ENOMEM;
229 memcpy(fi->last_name, name, len);
230 fi->last_name[len] = 0;
231 dout("note_last_dentry '%s'\n", fi->last_name);
232 return 0;
233}
234
235static int ceph_readdir(struct file *file, struct dir_context *ctx)
236{
237 struct ceph_file_info *fi = file->private_data;
238 struct inode *inode = file_inode(file);
239 struct ceph_inode_info *ci = ceph_inode(inode);
240 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
241 struct ceph_mds_client *mdsc = fsc->mdsc;
242 unsigned frag = fpos_frag(ctx->pos);
243 int off = fpos_off(ctx->pos);
244 int err;
245 u32 ftype;
246 struct ceph_mds_reply_info_parsed *rinfo;
247 const int max_entries = fsc->mount_options->max_readdir;
248 const int max_bytes = fsc->mount_options->max_readdir_bytes;
249
250 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
251 if (fi->flags & CEPH_F_ATEND)
252 return 0;
253
254
255 if (ctx->pos == 0) {
256
257
258 fi->dir_release_count = atomic_read(&ci->i_release_count);
259
260 dout("readdir off 0 -> '.'\n");
261 if (!dir_emit(ctx, ".", 1,
262 ceph_translate_ino(inode->i_sb, inode->i_ino),
263 inode->i_mode >> 12))
264 return 0;
265 ctx->pos = 1;
266 off = 1;
267 }
268 if (ctx->pos == 1) {
269 ino_t ino = parent_ino(file->f_dentry);
270 dout("readdir off 1 -> '..'\n");
271 if (!dir_emit(ctx, "..", 2,
272 ceph_translate_ino(inode->i_sb, ino),
273 inode->i_mode >> 12))
274 return 0;
275 ctx->pos = 2;
276 off = 2;
277 }
278
279
280 spin_lock(&ci->i_ceph_lock);
281 if ((ctx->pos == 2 || fi->dentry) &&
282 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
283 ceph_snap(inode) != CEPH_SNAPDIR &&
284 __ceph_dir_is_complete(ci) &&
285 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
286 spin_unlock(&ci->i_ceph_lock);
287 err = __dcache_readdir(file, ctx);
288 if (err != -EAGAIN)
289 return err;
290 } else {
291 spin_unlock(&ci->i_ceph_lock);
292 }
293 if (fi->dentry) {
294 err = note_last_dentry(fi, fi->dentry->d_name.name,
295 fi->dentry->d_name.len);
296 if (err)
297 return err;
298 dput(fi->dentry);
299 fi->dentry = NULL;
300 }
301
302
303
304more:
305
306 if (fi->frag != frag || fi->last_readdir == NULL) {
307 struct ceph_mds_request *req;
308 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
309 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
310
311
312 if (fi->last_readdir) {
313 ceph_mdsc_put_request(fi->last_readdir);
314 fi->last_readdir = NULL;
315 }
316
317
318 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
319
320 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
321 ceph_vinop(inode), frag, fi->last_name);
322 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
323 if (IS_ERR(req))
324 return PTR_ERR(req);
325 req->r_inode = inode;
326 ihold(inode);
327 req->r_dentry = dget(file->f_dentry);
328
329 req->r_direct_mode = USE_AUTH_MDS;
330 req->r_direct_hash = ceph_frag_value(frag);
331 req->r_direct_is_hash = true;
332 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
333 req->r_readdir_offset = fi->next_offset;
334 req->r_args.readdir.frag = cpu_to_le32(frag);
335 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
336 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
337 req->r_num_caps = max_entries + 1;
338 err = ceph_mdsc_do_request(mdsc, NULL, req);
339 if (err < 0) {
340 ceph_mdsc_put_request(req);
341 return err;
342 }
343 dout("readdir got and parsed readdir result=%d"
344 " on frag %x, end=%d, complete=%d\n", err, frag,
345 (int)req->r_reply_info.dir_end,
346 (int)req->r_reply_info.dir_complete);
347
348 if (!req->r_did_prepopulate) {
349 dout("readdir !did_prepopulate");
350
351 fi->dir_release_count--;
352 }
353
354
355 fi->offset = fi->next_offset;
356 fi->last_readdir = req;
357
358 if (req->r_reply_info.dir_end) {
359 kfree(fi->last_name);
360 fi->last_name = NULL;
361 if (ceph_frag_is_rightmost(frag))
362 fi->next_offset = 2;
363 else
364 fi->next_offset = 0;
365 } else {
366 rinfo = &req->r_reply_info;
367 err = note_last_dentry(fi,
368 rinfo->dir_dname[rinfo->dir_nr-1],
369 rinfo->dir_dname_len[rinfo->dir_nr-1]);
370 if (err)
371 return err;
372 fi->next_offset += rinfo->dir_nr;
373 }
374 }
375
376 rinfo = &fi->last_readdir->r_reply_info;
377 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
378 rinfo->dir_nr, off, fi->offset);
379
380 ctx->pos = ceph_make_fpos(frag, off);
381 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
382 struct ceph_mds_reply_inode *in =
383 rinfo->dir_in[off - fi->offset].in;
384 struct ceph_vino vino;
385 ino_t ino;
386
387 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
388 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
389 rinfo->dir_dname_len[off - fi->offset],
390 rinfo->dir_dname[off - fi->offset], in);
391 BUG_ON(!in);
392 ftype = le32_to_cpu(in->mode) >> 12;
393 vino.ino = le64_to_cpu(in->ino);
394 vino.snap = le64_to_cpu(in->snapid);
395 ino = ceph_vino_to_ino(vino);
396 if (!dir_emit(ctx,
397 rinfo->dir_dname[off - fi->offset],
398 rinfo->dir_dname_len[off - fi->offset],
399 ceph_translate_ino(inode->i_sb, ino), ftype)) {
400 dout("filldir stopping us...\n");
401 return 0;
402 }
403 off++;
404 ctx->pos++;
405 }
406
407 if (fi->last_name) {
408 ceph_mdsc_put_request(fi->last_readdir);
409 fi->last_readdir = NULL;
410 goto more;
411 }
412
413
414 if (!ceph_frag_is_rightmost(frag)) {
415 frag = ceph_frag_next(frag);
416 off = 0;
417 ctx->pos = ceph_make_fpos(frag, off);
418 dout("readdir next frag is %x\n", frag);
419 goto more;
420 }
421 fi->flags |= CEPH_F_ATEND;
422
423
424
425
426
427
428 spin_lock(&ci->i_ceph_lock);
429 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
430 dout(" marking %p complete\n", inode);
431 __ceph_dir_set_complete(ci, fi->dir_release_count);
432 ci->i_max_offset = ctx->pos;
433 }
434 spin_unlock(&ci->i_ceph_lock);
435
436 dout("readdir %p file %p done.\n", inode, file);
437 return 0;
438}
439
440static void reset_readdir(struct ceph_file_info *fi)
441{
442 if (fi->last_readdir) {
443 ceph_mdsc_put_request(fi->last_readdir);
444 fi->last_readdir = NULL;
445 }
446 kfree(fi->last_name);
447 fi->last_name = NULL;
448 fi->next_offset = 2;
449 if (fi->dentry) {
450 dput(fi->dentry);
451 fi->dentry = NULL;
452 }
453 fi->flags &= ~CEPH_F_ATEND;
454}
455
456static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
457{
458 struct ceph_file_info *fi = file->private_data;
459 struct inode *inode = file->f_mapping->host;
460 loff_t old_offset = offset;
461 loff_t retval;
462
463 mutex_lock(&inode->i_mutex);
464 retval = -EINVAL;
465 switch (whence) {
466 case SEEK_END:
467 offset += inode->i_size + 2;
468 break;
469 case SEEK_CUR:
470 offset += file->f_pos;
471 case SEEK_SET:
472 break;
473 default:
474 goto out;
475 }
476
477 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
478 if (offset != file->f_pos) {
479 file->f_pos = offset;
480 file->f_version = 0;
481 fi->flags &= ~CEPH_F_ATEND;
482 }
483 retval = offset;
484
485
486
487
488
489 if (offset == 0 ||
490 fpos_frag(offset) != fpos_frag(old_offset) ||
491 fpos_off(offset) < fi->offset) {
492 dout("dir_llseek dropping %p content\n", file);
493 reset_readdir(fi);
494 }
495
496
497 if (offset > old_offset)
498 fi->dir_release_count--;
499 }
500out:
501 mutex_unlock(&inode->i_mutex);
502 return retval;
503}
504
505
506
507
508int ceph_handle_snapdir(struct ceph_mds_request *req,
509 struct dentry *dentry, int err)
510{
511 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
512 struct inode *parent = dentry->d_parent->d_inode;
513
514
515 if (err == -ENOENT &&
516 ceph_snap(parent) == CEPH_NOSNAP &&
517 strcmp(dentry->d_name.name,
518 fsc->mount_options->snapdir_name) == 0) {
519 struct inode *inode = ceph_get_snapdir(parent);
520 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
521 dentry, dentry->d_name.len, dentry->d_name.name, inode);
522 BUG_ON(!d_unhashed(dentry));
523 d_add(dentry, inode);
524 err = 0;
525 }
526 return err;
527}
528
529
530
531
532
533
534
535
536
537
538
539
540struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
541 struct dentry *dentry, int err)
542{
543 if (err == -ENOENT) {
544
545 err = 0;
546 if (!req->r_reply_info.head->is_dentry) {
547 dout("ENOENT and no trace, dentry %p inode %p\n",
548 dentry, dentry->d_inode);
549 if (dentry->d_inode) {
550 d_drop(dentry);
551 err = -ENOENT;
552 } else {
553 d_add(dentry, NULL);
554 }
555 }
556 }
557 if (err)
558 dentry = ERR_PTR(err);
559 else if (dentry != req->r_dentry)
560 dentry = dget(req->r_dentry);
561 else
562 dentry = NULL;
563 return dentry;
564}
565
566static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
567{
568 return ceph_ino(inode) == CEPH_INO_ROOT &&
569 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
570}
571
572
573
574
575
576static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
577 unsigned int flags)
578{
579 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
580 struct ceph_mds_client *mdsc = fsc->mdsc;
581 struct ceph_mds_request *req;
582 int op;
583 int err;
584
585 dout("lookup %p dentry %p '%.*s'\n",
586 dir, dentry, dentry->d_name.len, dentry->d_name.name);
587
588 if (dentry->d_name.len > NAME_MAX)
589 return ERR_PTR(-ENAMETOOLONG);
590
591 err = ceph_init_dentry(dentry);
592 if (err < 0)
593 return ERR_PTR(err);
594
595
596 if (dentry->d_inode == NULL) {
597 struct ceph_inode_info *ci = ceph_inode(dir);
598 struct ceph_dentry_info *di = ceph_dentry(dentry);
599
600 spin_lock(&ci->i_ceph_lock);
601 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
602 if (strncmp(dentry->d_name.name,
603 fsc->mount_options->snapdir_name,
604 dentry->d_name.len) &&
605 !is_root_ceph_dentry(dir, dentry) &&
606 __ceph_dir_is_complete(ci) &&
607 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
608 spin_unlock(&ci->i_ceph_lock);
609 dout(" dir %p complete, -ENOENT\n", dir);
610 d_add(dentry, NULL);
611 di->lease_shared_gen = ci->i_shared_gen;
612 return NULL;
613 }
614 spin_unlock(&ci->i_ceph_lock);
615 }
616
617 op = ceph_snap(dir) == CEPH_SNAPDIR ?
618 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
619 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
620 if (IS_ERR(req))
621 return ERR_CAST(req);
622 req->r_dentry = dget(dentry);
623 req->r_num_caps = 2;
624
625 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
626 req->r_locked_dir = dir;
627 err = ceph_mdsc_do_request(mdsc, NULL, req);
628 err = ceph_handle_snapdir(req, dentry, err);
629 dentry = ceph_finish_lookup(req, dentry, err);
630 ceph_mdsc_put_request(req);
631 dout("lookup result=%p\n", dentry);
632 return dentry;
633}
634
635
636
637
638
639int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
640{
641 struct dentry *result = ceph_lookup(dir, dentry, 0);
642
643 if (result && !IS_ERR(result)) {
644
645
646
647
648
649
650
651 BUG_ON(!result->d_inode);
652 d_instantiate(dentry, result->d_inode);
653 return 0;
654 }
655 return PTR_ERR(result);
656}
657
658static int ceph_mknod(struct inode *dir, struct dentry *dentry,
659 umode_t mode, dev_t rdev)
660{
661 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
662 struct ceph_mds_client *mdsc = fsc->mdsc;
663 struct ceph_mds_request *req;
664 int err;
665
666 if (ceph_snap(dir) != CEPH_NOSNAP)
667 return -EROFS;
668
669 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
670 dir, dentry, mode, rdev);
671 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
672 if (IS_ERR(req)) {
673 d_drop(dentry);
674 return PTR_ERR(req);
675 }
676 req->r_dentry = dget(dentry);
677 req->r_num_caps = 2;
678 req->r_locked_dir = dir;
679 req->r_args.mknod.mode = cpu_to_le32(mode);
680 req->r_args.mknod.rdev = cpu_to_le32(rdev);
681 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
682 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
683 err = ceph_mdsc_do_request(mdsc, dir, req);
684 if (!err && !req->r_reply_info.head->is_dentry)
685 err = ceph_handle_notrace_create(dir, dentry);
686 ceph_mdsc_put_request(req);
687 if (err)
688 d_drop(dentry);
689 return err;
690}
691
692static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
693 bool excl)
694{
695 return ceph_mknod(dir, dentry, mode, 0);
696}
697
698static int ceph_symlink(struct inode *dir, struct dentry *dentry,
699 const char *dest)
700{
701 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
702 struct ceph_mds_client *mdsc = fsc->mdsc;
703 struct ceph_mds_request *req;
704 int err;
705
706 if (ceph_snap(dir) != CEPH_NOSNAP)
707 return -EROFS;
708
709 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
710 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
711 if (IS_ERR(req)) {
712 d_drop(dentry);
713 return PTR_ERR(req);
714 }
715 req->r_dentry = dget(dentry);
716 req->r_num_caps = 2;
717 req->r_path2 = kstrdup(dest, GFP_NOFS);
718 req->r_locked_dir = dir;
719 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
720 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
721 err = ceph_mdsc_do_request(mdsc, dir, req);
722 if (!err && !req->r_reply_info.head->is_dentry)
723 err = ceph_handle_notrace_create(dir, dentry);
724 ceph_mdsc_put_request(req);
725 if (err)
726 d_drop(dentry);
727 return err;
728}
729
730static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
731{
732 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
733 struct ceph_mds_client *mdsc = fsc->mdsc;
734 struct ceph_mds_request *req;
735 int err = -EROFS;
736 int op;
737
738 if (ceph_snap(dir) == CEPH_SNAPDIR) {
739
740 op = CEPH_MDS_OP_MKSNAP;
741 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
742 dentry->d_name.len, dentry->d_name.name, dentry);
743 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
744 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
745 op = CEPH_MDS_OP_MKDIR;
746 } else {
747 goto out;
748 }
749 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
750 if (IS_ERR(req)) {
751 err = PTR_ERR(req);
752 goto out;
753 }
754
755 req->r_dentry = dget(dentry);
756 req->r_num_caps = 2;
757 req->r_locked_dir = dir;
758 req->r_args.mkdir.mode = cpu_to_le32(mode);
759 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
760 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
761 err = ceph_mdsc_do_request(mdsc, dir, req);
762 if (!err && !req->r_reply_info.head->is_dentry)
763 err = ceph_handle_notrace_create(dir, dentry);
764 ceph_mdsc_put_request(req);
765out:
766 if (err < 0)
767 d_drop(dentry);
768 return err;
769}
770
771static int ceph_link(struct dentry *old_dentry, struct inode *dir,
772 struct dentry *dentry)
773{
774 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
775 struct ceph_mds_client *mdsc = fsc->mdsc;
776 struct ceph_mds_request *req;
777 int err;
778
779 if (ceph_snap(dir) != CEPH_NOSNAP)
780 return -EROFS;
781
782 dout("link in dir %p old_dentry %p dentry %p\n", dir,
783 old_dentry, dentry);
784 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
785 if (IS_ERR(req)) {
786 d_drop(dentry);
787 return PTR_ERR(req);
788 }
789 req->r_dentry = dget(dentry);
790 req->r_num_caps = 2;
791 req->r_old_dentry = dget(old_dentry);
792 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
793 req->r_locked_dir = dir;
794 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
795 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
796 err = ceph_mdsc_do_request(mdsc, dir, req);
797 if (err) {
798 d_drop(dentry);
799 } else if (!req->r_reply_info.head->is_dentry) {
800 ihold(old_dentry->d_inode);
801 d_instantiate(dentry, old_dentry->d_inode);
802 }
803 ceph_mdsc_put_request(req);
804 return err;
805}
806
807
808
809
810
811
812
813static int drop_caps_for_unlink(struct inode *inode)
814{
815 struct ceph_inode_info *ci = ceph_inode(inode);
816 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
817
818 spin_lock(&ci->i_ceph_lock);
819 if (inode->i_nlink == 1) {
820 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
821 ci->i_ceph_flags |= CEPH_I_NODELAY;
822 }
823 spin_unlock(&ci->i_ceph_lock);
824 return drop;
825}
826
827
828
829
830static int ceph_unlink(struct inode *dir, struct dentry *dentry)
831{
832 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
833 struct ceph_mds_client *mdsc = fsc->mdsc;
834 struct inode *inode = dentry->d_inode;
835 struct ceph_mds_request *req;
836 int err = -EROFS;
837 int op;
838
839 if (ceph_snap(dir) == CEPH_SNAPDIR) {
840
841 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
842 dentry->d_name.name, dentry);
843 op = CEPH_MDS_OP_RMSNAP;
844 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
845 dout("unlink/rmdir dir %p dn %p inode %p\n",
846 dir, dentry, inode);
847 op = S_ISDIR(dentry->d_inode->i_mode) ?
848 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
849 } else
850 goto out;
851 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
852 if (IS_ERR(req)) {
853 err = PTR_ERR(req);
854 goto out;
855 }
856 req->r_dentry = dget(dentry);
857 req->r_num_caps = 2;
858 req->r_locked_dir = dir;
859 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
860 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
861 req->r_inode_drop = drop_caps_for_unlink(inode);
862 err = ceph_mdsc_do_request(mdsc, dir, req);
863 if (!err && !req->r_reply_info.head->is_dentry)
864 d_delete(dentry);
865 ceph_mdsc_put_request(req);
866out:
867 return err;
868}
869
870static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
871 struct inode *new_dir, struct dentry *new_dentry)
872{
873 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
874 struct ceph_mds_client *mdsc = fsc->mdsc;
875 struct ceph_mds_request *req;
876 int err;
877
878 if (ceph_snap(old_dir) != ceph_snap(new_dir))
879 return -EXDEV;
880 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
881 ceph_snap(new_dir) != CEPH_NOSNAP)
882 return -EROFS;
883 dout("rename dir %p dentry %p to dir %p dentry %p\n",
884 old_dir, old_dentry, new_dir, new_dentry);
885 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
886 if (IS_ERR(req))
887 return PTR_ERR(req);
888 req->r_dentry = dget(new_dentry);
889 req->r_num_caps = 2;
890 req->r_old_dentry = dget(old_dentry);
891 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
892 req->r_locked_dir = new_dir;
893 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
894 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
895 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
896 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
897
898 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
899 if (new_dentry->d_inode)
900 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
901 err = ceph_mdsc_do_request(mdsc, old_dir, req);
902 if (!err && !req->r_reply_info.head->is_dentry) {
903
904
905
906
907
908
909
910 ceph_dir_clear_complete(new_dir);
911
912 d_move(old_dentry, new_dentry);
913
914
915
916 ceph_invalidate_dentry_lease(new_dentry);
917 }
918 ceph_mdsc_put_request(req);
919 return err;
920}
921
922
923
924
925void ceph_invalidate_dentry_lease(struct dentry *dentry)
926{
927 spin_lock(&dentry->d_lock);
928 dentry->d_time = jiffies;
929 ceph_dentry(dentry)->lease_shared_gen = 0;
930 spin_unlock(&dentry->d_lock);
931}
932
933
934
935
936
937static int dentry_lease_is_valid(struct dentry *dentry)
938{
939 struct ceph_dentry_info *di;
940 struct ceph_mds_session *s;
941 int valid = 0;
942 u32 gen;
943 unsigned long ttl;
944 struct ceph_mds_session *session = NULL;
945 struct inode *dir = NULL;
946 u32 seq = 0;
947
948 spin_lock(&dentry->d_lock);
949 di = ceph_dentry(dentry);
950 if (di->lease_session) {
951 s = di->lease_session;
952 spin_lock(&s->s_gen_ttl_lock);
953 gen = s->s_cap_gen;
954 ttl = s->s_cap_ttl;
955 spin_unlock(&s->s_gen_ttl_lock);
956
957 if (di->lease_gen == gen &&
958 time_before(jiffies, dentry->d_time) &&
959 time_before(jiffies, ttl)) {
960 valid = 1;
961 if (di->lease_renew_after &&
962 time_after(jiffies, di->lease_renew_after)) {
963
964 dir = dentry->d_parent->d_inode;
965 session = ceph_get_mds_session(s);
966 seq = di->lease_seq;
967 di->lease_renew_after = 0;
968 di->lease_renew_from = jiffies;
969 }
970 }
971 }
972 spin_unlock(&dentry->d_lock);
973
974 if (session) {
975 ceph_mdsc_lease_send_msg(session, dir, dentry,
976 CEPH_MDS_LEASE_RENEW, seq);
977 ceph_put_mds_session(session);
978 }
979 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
980 return valid;
981}
982
983
984
985
986static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
987{
988 struct ceph_inode_info *ci = ceph_inode(dir);
989 struct ceph_dentry_info *di = ceph_dentry(dentry);
990 int valid = 0;
991
992 spin_lock(&ci->i_ceph_lock);
993 if (ci->i_shared_gen == di->lease_shared_gen)
994 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
995 spin_unlock(&ci->i_ceph_lock);
996 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
997 dir, (unsigned)ci->i_shared_gen, dentry,
998 (unsigned)di->lease_shared_gen, valid);
999 return valid;
1000}
1001
1002
1003
1004
1005static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1006{
1007 int valid = 0;
1008 struct inode *dir;
1009
1010 if (flags & LOOKUP_RCU)
1011 return -ECHILD;
1012
1013 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1014 dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1015 ceph_dentry(dentry)->offset);
1016
1017 dir = ceph_get_dentry_parent_inode(dentry);
1018
1019
1020 if (ceph_snap(dir) != CEPH_NOSNAP) {
1021 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1022 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1023 valid = 1;
1024 } else if (dentry->d_inode &&
1025 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1026 valid = 1;
1027 } else if (dentry_lease_is_valid(dentry) ||
1028 dir_lease_is_valid(dir, dentry)) {
1029 valid = 1;
1030 }
1031
1032 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1033 if (valid)
1034 ceph_dentry_lru_touch(dentry);
1035 else
1036 d_drop(dentry);
1037 iput(dir);
1038 return valid;
1039}
1040
1041
1042
1043
1044static void ceph_d_release(struct dentry *dentry)
1045{
1046 struct ceph_dentry_info *di = ceph_dentry(dentry);
1047
1048 dout("d_release %p\n", dentry);
1049 ceph_dentry_lru_del(dentry);
1050 if (di->lease_session)
1051 ceph_put_mds_session(di->lease_session);
1052 kmem_cache_free(ceph_dentry_cachep, di);
1053 dentry->d_fsdata = NULL;
1054}
1055
1056static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1057 unsigned int flags)
1058{
1059
1060
1061
1062
1063 return 1;
1064}
1065
1066
1067
1068
1069
1070
1071
1072static void ceph_d_prune(struct dentry *dentry)
1073{
1074 dout("ceph_d_prune %p\n", dentry);
1075
1076
1077 if (IS_ROOT(dentry))
1078 return;
1079
1080
1081 if (d_unhashed(dentry))
1082 return;
1083
1084
1085
1086
1087
1088 ceph_dir_clear_complete(dentry->d_parent->d_inode);
1089}
1090
1091
1092
1093
1094
1095static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1096 loff_t *ppos)
1097{
1098 struct ceph_file_info *cf = file->private_data;
1099 struct inode *inode = file_inode(file);
1100 struct ceph_inode_info *ci = ceph_inode(inode);
1101 int left;
1102 const int bufsize = 1024;
1103
1104 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1105 return -EISDIR;
1106
1107 if (!cf->dir_info) {
1108 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1109 if (!cf->dir_info)
1110 return -ENOMEM;
1111 cf->dir_info_len =
1112 snprintf(cf->dir_info, bufsize,
1113 "entries: %20lld\n"
1114 " files: %20lld\n"
1115 " subdirs: %20lld\n"
1116 "rentries: %20lld\n"
1117 " rfiles: %20lld\n"
1118 " rsubdirs: %20lld\n"
1119 "rbytes: %20lld\n"
1120 "rctime: %10ld.%09ld\n",
1121 ci->i_files + ci->i_subdirs,
1122 ci->i_files,
1123 ci->i_subdirs,
1124 ci->i_rfiles + ci->i_rsubdirs,
1125 ci->i_rfiles,
1126 ci->i_rsubdirs,
1127 ci->i_rbytes,
1128 (long)ci->i_rctime.tv_sec,
1129 (long)ci->i_rctime.tv_nsec);
1130 }
1131
1132 if (*ppos >= cf->dir_info_len)
1133 return 0;
1134 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1135 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1136 if (left == size)
1137 return -EFAULT;
1138 *ppos += (size - left);
1139 return size - left;
1140}
1141
1142
1143
1144
1145
1146static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1147 int datasync)
1148{
1149 struct inode *inode = file_inode(file);
1150 struct ceph_inode_info *ci = ceph_inode(inode);
1151 struct list_head *head = &ci->i_unsafe_dirops;
1152 struct ceph_mds_request *req;
1153 u64 last_tid;
1154 int ret = 0;
1155
1156 dout("dir_fsync %p\n", inode);
1157 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1158 if (ret)
1159 return ret;
1160 mutex_lock(&inode->i_mutex);
1161
1162 spin_lock(&ci->i_unsafe_lock);
1163 if (list_empty(head))
1164 goto out;
1165
1166 req = list_entry(head->prev,
1167 struct ceph_mds_request, r_unsafe_dir_item);
1168 last_tid = req->r_tid;
1169
1170 do {
1171 ceph_mdsc_get_request(req);
1172 spin_unlock(&ci->i_unsafe_lock);
1173
1174 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1175 inode, req->r_tid, last_tid);
1176 if (req->r_timeout) {
1177 ret = wait_for_completion_timeout(
1178 &req->r_safe_completion, req->r_timeout);
1179 if (ret > 0)
1180 ret = 0;
1181 else if (ret == 0)
1182 ret = -EIO;
1183 } else {
1184 wait_for_completion(&req->r_safe_completion);
1185 }
1186 ceph_mdsc_put_request(req);
1187
1188 spin_lock(&ci->i_unsafe_lock);
1189 if (ret || list_empty(head))
1190 break;
1191 req = list_entry(head->next,
1192 struct ceph_mds_request, r_unsafe_dir_item);
1193 } while (req->r_tid < last_tid);
1194out:
1195 spin_unlock(&ci->i_unsafe_lock);
1196 mutex_unlock(&inode->i_mutex);
1197
1198 return ret;
1199}
1200
1201
1202
1203
1204
1205
1206void ceph_dentry_lru_add(struct dentry *dn)
1207{
1208 struct ceph_dentry_info *di = ceph_dentry(dn);
1209 struct ceph_mds_client *mdsc;
1210
1211 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1212 dn->d_name.len, dn->d_name.name);
1213 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1214 spin_lock(&mdsc->dentry_lru_lock);
1215 list_add_tail(&di->lru, &mdsc->dentry_lru);
1216 mdsc->num_dentry++;
1217 spin_unlock(&mdsc->dentry_lru_lock);
1218}
1219
1220void ceph_dentry_lru_touch(struct dentry *dn)
1221{
1222 struct ceph_dentry_info *di = ceph_dentry(dn);
1223 struct ceph_mds_client *mdsc;
1224
1225 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1226 dn->d_name.len, dn->d_name.name, di->offset);
1227 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1228 spin_lock(&mdsc->dentry_lru_lock);
1229 list_move_tail(&di->lru, &mdsc->dentry_lru);
1230 spin_unlock(&mdsc->dentry_lru_lock);
1231}
1232
1233void ceph_dentry_lru_del(struct dentry *dn)
1234{
1235 struct ceph_dentry_info *di = ceph_dentry(dn);
1236 struct ceph_mds_client *mdsc;
1237
1238 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1239 dn->d_name.len, dn->d_name.name);
1240 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1241 spin_lock(&mdsc->dentry_lru_lock);
1242 list_del_init(&di->lru);
1243 mdsc->num_dentry--;
1244 spin_unlock(&mdsc->dentry_lru_lock);
1245}
1246
1247
1248
1249
1250
1251unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1252{
1253 struct ceph_inode_info *dci = ceph_inode(dir);
1254
1255 switch (dci->i_dir_layout.dl_dir_hash) {
1256 case 0:
1257 case CEPH_STR_HASH_LINUX:
1258 return dn->d_name.hash;
1259
1260 default:
1261 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1262 dn->d_name.name, dn->d_name.len);
1263 }
1264}
1265
1266const struct file_operations ceph_dir_fops = {
1267 .read = ceph_read_dir,
1268 .iterate = ceph_readdir,
1269 .llseek = ceph_dir_llseek,
1270 .open = ceph_open,
1271 .release = ceph_release,
1272 .unlocked_ioctl = ceph_ioctl,
1273 .fsync = ceph_dir_fsync,
1274};
1275
1276const struct inode_operations ceph_dir_iops = {
1277 .lookup = ceph_lookup,
1278 .permission = ceph_permission,
1279 .getattr = ceph_getattr,
1280 .setattr = ceph_setattr,
1281 .setxattr = ceph_setxattr,
1282 .getxattr = ceph_getxattr,
1283 .listxattr = ceph_listxattr,
1284 .removexattr = ceph_removexattr,
1285 .mknod = ceph_mknod,
1286 .symlink = ceph_symlink,
1287 .mkdir = ceph_mkdir,
1288 .link = ceph_link,
1289 .unlink = ceph_unlink,
1290 .rmdir = ceph_unlink,
1291 .rename = ceph_rename,
1292 .create = ceph_create,
1293 .atomic_open = ceph_atomic_open,
1294};
1295
1296const struct dentry_operations ceph_dentry_ops = {
1297 .d_revalidate = ceph_d_revalidate,
1298 .d_release = ceph_d_release,
1299 .d_prune = ceph_d_prune,
1300};
1301
1302const struct dentry_operations ceph_snapdir_dentry_ops = {
1303 .d_revalidate = ceph_snapdir_d_revalidate,
1304 .d_release = ceph_d_release,
1305};
1306
1307const struct dentry_operations ceph_snap_dentry_ops = {
1308 .d_release = ceph_d_release,
1309 .d_prune = ceph_d_prune,
1310};
1311