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md/raid1: fix writebehind bio clone
[linux-stable.git] / fs / afs / dir.c
blob613a7705826377fa472cbd0b7bc7196071501c37
1 /* dir.c: AFS filesystem directory handling
2 *
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/fs.h>
16 #include <linux/namei.h>
17 #include <linux/pagemap.h>
18 #include <linux/ctype.h>
19 #include <linux/sched.h>
20 #include "internal.h"
21
22 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
23 unsigned int flags);
24 static int afs_dir_open(struct inode *inode, struct file *file);
25 static int afs_readdir(struct file *file, struct dir_context *ctx);
26 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
27 static int afs_d_delete(const struct dentry *dentry);
28 static void afs_d_release(struct dentry *dentry);
29 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
30 loff_t fpos, u64 ino, unsigned dtype);
31 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
32 bool excl);
33 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
34 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
35 static int afs_unlink(struct inode *dir, struct dentry *dentry);
36 static int afs_link(struct dentry *from, struct inode *dir,
37 struct dentry *dentry);
38 static int afs_symlink(struct inode *dir, struct dentry *dentry,
39 const char *content);
40 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
41 struct inode *new_dir, struct dentry *new_dentry,
42 unsigned int flags);
43
44 const struct file_operations afs_dir_file_operations = {
45 .open = afs_dir_open,
46 .release = afs_release,
47 .iterate_shared = afs_readdir,
48 .lock = afs_lock,
49 .llseek = generic_file_llseek,
50 };
51
52 const struct inode_operations afs_dir_inode_operations = {
53 .create = afs_create,
54 .lookup = afs_lookup,
55 .link = afs_link,
56 .unlink = afs_unlink,
57 .symlink = afs_symlink,
58 .mkdir = afs_mkdir,
59 .rmdir = afs_rmdir,
60 .rename = afs_rename,
61 .permission = afs_permission,
62 .getattr = afs_getattr,
63 .setattr = afs_setattr,
64 .listxattr = afs_listxattr,
65 };
66
67 const struct dentry_operations afs_fs_dentry_operations = {
68 .d_revalidate = afs_d_revalidate,
69 .d_delete = afs_d_delete,
70 .d_release = afs_d_release,
71 .d_automount = afs_d_automount,
72 };
73
74 #define AFS_DIR_HASHTBL_SIZE 128
75 #define AFS_DIR_DIRENT_SIZE 32
76 #define AFS_DIRENT_PER_BLOCK 64
77
78 union afs_dirent {
79 struct {
80 uint8_t valid;
81 uint8_t unused[1];
82 __be16 hash_next;
83 __be32 vnode;
84 __be32 unique;
85 uint8_t name[16];
86 uint8_t overflow[4]; /* if any char of the name (inc
87 * NUL) reaches here, consume
88 * the next dirent too */
89 } u;
90 uint8_t extended_name[32];
91 };
92
93 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
94 struct afs_dir_pagehdr {
95 __be16 npages;
96 __be16 magic;
97 #define AFS_DIR_MAGIC htons(1234)
98 uint8_t nentries;
99 uint8_t bitmap[8];
100 uint8_t pad[19];
101 };
102
103 /* directory block layout */
104 union afs_dir_block {
105
106 struct afs_dir_pagehdr pagehdr;
107
108 struct {
109 struct afs_dir_pagehdr pagehdr;
110 uint8_t alloc_ctrs[128];
111 /* dir hash table */
112 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
113 } hdr;
114
115 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
116 };
117
118 /* layout on a linux VM page */
119 struct afs_dir_page {
120 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
121 };
122
123 struct afs_lookup_cookie {
124 struct dir_context ctx;
125 struct afs_fid fid;
126 struct qstr name;
127 int found;
128 };
129
130 /*
131 * check that a directory page is valid
132 */
133 static inline bool afs_dir_check_page(struct inode *dir, struct page *page)
134 {
135 struct afs_dir_page *dbuf;
136 loff_t latter;
137 int tmp, qty;
138
139 #if 0
140 /* check the page count */
141 qty = desc.size / sizeof(dbuf->blocks[0]);
142 if (qty == 0)
143 goto error;
144
145 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
146 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
147 __func__, dir->i_ino, qty,
148 ntohs(dbuf->blocks[0].pagehdr.npages));
149 goto error;
150 }
151 #endif
152
153 /* determine how many magic numbers there should be in this page */
154 latter = dir->i_size - page_offset(page);
155 if (latter >= PAGE_SIZE)
156 qty = PAGE_SIZE;
157 else
158 qty = latter;
159 qty /= sizeof(union afs_dir_block);
160
161 /* check them */
162 dbuf = page_address(page);
163 for (tmp = 0; tmp < qty; tmp++) {
164 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
165 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
166 __func__, dir->i_ino, tmp, qty,
167 ntohs(dbuf->blocks[tmp].pagehdr.magic));
168 goto error;
169 }
170 }
171
172 SetPageChecked(page);
173 return true;
174
175 error:
176 SetPageError(page);
177 return false;
178 }
179
180 /*
181 * discard a page cached in the pagecache
182 */
183 static inline void afs_dir_put_page(struct page *page)
184 {
185 kunmap(page);
186 put_page(page);
187 }
188
189 /*
190 * get a page into the pagecache
191 */
192 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
193 struct key *key)
194 {
195 struct page *page;
196 _enter("{%lu},%lu", dir->i_ino, index);
197
198 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
199 if (!IS_ERR(page)) {
200 kmap(page);
201 if (unlikely(!PageChecked(page))) {
202 if (PageError(page) || !afs_dir_check_page(dir, page))
203 goto fail;
204 }
205 }
206 return page;
207
208 fail:
209 afs_dir_put_page(page);
210 _leave(" = -EIO");
211 return ERR_PTR(-EIO);
212 }
213
214 /*
215 * open an AFS directory file
216 */
217 static int afs_dir_open(struct inode *inode, struct file *file)
218 {
219 _enter("{%lu}", inode->i_ino);
220
221 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
222 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
223
224 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
225 return -ENOENT;
226
227 return afs_open(inode, file);
228 }
229
230 /*
231 * deal with one block in an AFS directory
232 */
233 static int afs_dir_iterate_block(struct dir_context *ctx,
234 union afs_dir_block *block,
235 unsigned blkoff)
236 {
237 union afs_dirent *dire;
238 unsigned offset, next, curr;
239 size_t nlen;
240 int tmp;
241
242 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
243
244 curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
245
246 /* walk through the block, an entry at a time */
247 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
248 offset < AFS_DIRENT_PER_BLOCK;
249 offset = next
250 ) {
251 next = offset + 1;
252
253 /* skip entries marked unused in the bitmap */
254 if (!(block->pagehdr.bitmap[offset / 8] &
255 (1 << (offset % 8)))) {
256 _debug("ENT[%zu.%u]: unused",
257 blkoff / sizeof(union afs_dir_block), offset);
258 if (offset >= curr)
259 ctx->pos = blkoff +
260 next * sizeof(union afs_dirent);
261 continue;
262 }
263
264 /* got a valid entry */
265 dire = &block->dirents[offset];
266 nlen = strnlen(dire->u.name,
267 sizeof(*block) -
268 offset * sizeof(union afs_dirent));
269
270 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
271 blkoff / sizeof(union afs_dir_block), offset,
272 (offset < curr ? "skip" : "fill"),
273 nlen, dire->u.name);
274
275 /* work out where the next possible entry is */
276 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
277 if (next >= AFS_DIRENT_PER_BLOCK) {
278 _debug("ENT[%zu.%u]:"
279 " %u travelled beyond end dir block"
280 " (len %u/%zu)",
281 blkoff / sizeof(union afs_dir_block),
282 offset, next, tmp, nlen);
283 return -EIO;
284 }
285 if (!(block->pagehdr.bitmap[next / 8] &
286 (1 << (next % 8)))) {
287 _debug("ENT[%zu.%u]:"
288 " %u unmarked extension (len %u/%zu)",
289 blkoff / sizeof(union afs_dir_block),
290 offset, next, tmp, nlen);
291 return -EIO;
292 }
293
294 _debug("ENT[%zu.%u]: ext %u/%zu",
295 blkoff / sizeof(union afs_dir_block),
296 next, tmp, nlen);
297 next++;
298 }
299
300 /* skip if starts before the current position */
301 if (offset < curr)
302 continue;
303
304 /* found the next entry */
305 if (!dir_emit(ctx, dire->u.name, nlen,
306 ntohl(dire->u.vnode),
307 ctx->actor == afs_lookup_filldir ?
308 ntohl(dire->u.unique) : DT_UNKNOWN)) {
309 _leave(" = 0 [full]");
310 return 0;
311 }
312
313 ctx->pos = blkoff + next * sizeof(union afs_dirent);
314 }
315
316 _leave(" = 1 [more]");
317 return 1;
318 }
319
320 /*
321 * iterate through the data blob that lists the contents of an AFS directory
322 */
323 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
324 struct key *key)
325 {
326 union afs_dir_block *dblock;
327 struct afs_dir_page *dbuf;
328 struct page *page;
329 unsigned blkoff, limit;
330 int ret;
331
332 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
333
334 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
335 _leave(" = -ESTALE");
336 return -ESTALE;
337 }
338
339 /* round the file position up to the next entry boundary */
340 ctx->pos += sizeof(union afs_dirent) - 1;
341 ctx->pos &= ~(sizeof(union afs_dirent) - 1);
342
343 /* walk through the blocks in sequence */
344 ret = 0;
345 while (ctx->pos < dir->i_size) {
346 blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1);
347
348 /* fetch the appropriate page from the directory */
349 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
350 if (IS_ERR(page)) {
351 ret = PTR_ERR(page);
352 break;
353 }
354
355 limit = blkoff & ~(PAGE_SIZE - 1);
356
357 dbuf = page_address(page);
358
359 /* deal with the individual blocks stashed on this page */
360 do {
361 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
362 sizeof(union afs_dir_block)];
363 ret = afs_dir_iterate_block(ctx, dblock, blkoff);
364 if (ret != 1) {
365 afs_dir_put_page(page);
366 goto out;
367 }
368
369 blkoff += sizeof(union afs_dir_block);
370
371 } while (ctx->pos < dir->i_size && blkoff < limit);
372
373 afs_dir_put_page(page);
374 ret = 0;
375 }
376
377 out:
378 _leave(" = %d", ret);
379 return ret;
380 }
381
382 /*
383 * read an AFS directory
384 */
385 static int afs_readdir(struct file *file, struct dir_context *ctx)
386 {
387 return afs_dir_iterate(file_inode(file),
388 ctx, file->private_data);
389 }
390
391 /*
392 * search the directory for a name
393 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
394 * uniquifier through dtype
395 */
396 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
397 int nlen, loff_t fpos, u64 ino, unsigned dtype)
398 {
399 struct afs_lookup_cookie *cookie =
400 container_of(ctx, struct afs_lookup_cookie, ctx);
401
402 _enter("{%s,%u},%s,%u,,%llu,%u",
403 cookie->name.name, cookie->name.len, name, nlen,
404 (unsigned long long) ino, dtype);
405
406 /* insanity checks first */
407 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
408 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
409
410 if (cookie->name.len != nlen ||
411 memcmp(cookie->name.name, name, nlen) != 0) {
412 _leave(" = 0 [no]");
413 return 0;
414 }
415
416 cookie->fid.vnode = ino;
417 cookie->fid.unique = dtype;
418 cookie->found = 1;
419
420 _leave(" = -1 [found]");
421 return -1;
422 }
423
424 /*
425 * do a lookup in a directory
426 * - just returns the FID the dentry name maps to if found
427 */
428 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
429 struct afs_fid *fid, struct key *key)
430 {
431 struct afs_super_info *as = dir->i_sb->s_fs_info;
432 struct afs_lookup_cookie cookie = {
433 .ctx.actor = afs_lookup_filldir,
434 .name = dentry->d_name,
435 .fid.vid = as->volume->vid
436 };
437 int ret;
438
439 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
440
441 /* search the directory */
442 ret = afs_dir_iterate(dir, &cookie.ctx, key);
443 if (ret < 0) {
444 _leave(" = %d [iter]", ret);
445 return ret;
446 }
447
448 ret = -ENOENT;
449 if (!cookie.found) {
450 _leave(" = -ENOENT [not found]");
451 return -ENOENT;
452 }
453
454 *fid = cookie.fid;
455 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
456 return 0;
457 }
458
459 /*
460 * Try to auto mount the mountpoint with pseudo directory, if the autocell
461 * operation is setted.
462 */
463 static struct inode *afs_try_auto_mntpt(
464 int ret, struct dentry *dentry, struct inode *dir, struct key *key,
465 struct afs_fid *fid)
466 {
467 const char *devname = dentry->d_name.name;
468 struct afs_vnode *vnode = AFS_FS_I(dir);
469 struct inode *inode;
470
471 _enter("%d, %p{%pd}, {%x:%u}, %p",
472 ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key);
473
474 if (ret != -ENOENT ||
475 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
476 goto out;
477
478 inode = afs_iget_autocell(dir, devname, strlen(devname), key);
479 if (IS_ERR(inode)) {
480 ret = PTR_ERR(inode);
481 goto out;
482 }
483
484 *fid = AFS_FS_I(inode)->fid;
485 _leave("= %p", inode);
486 return inode;
487
488 out:
489 _leave("= %d", ret);
490 return ERR_PTR(ret);
491 }
492
493 /*
494 * look up an entry in a directory
495 */
496 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
497 unsigned int flags)
498 {
499 struct afs_vnode *vnode;
500 struct afs_fid fid;
501 struct inode *inode;
502 struct key *key;
503 int ret;
504
505 vnode = AFS_FS_I(dir);
506
507 _enter("{%x:%u},%p{%pd},",
508 vnode->fid.vid, vnode->fid.vnode, dentry, dentry);
509
510 ASSERTCMP(d_inode(dentry), ==, NULL);
511
512 if (dentry->d_name.len >= AFSNAMEMAX) {
513 _leave(" = -ENAMETOOLONG");
514 return ERR_PTR(-ENAMETOOLONG);
515 }
516
517 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
518 _leave(" = -ESTALE");
519 return ERR_PTR(-ESTALE);
520 }
521
522 key = afs_request_key(vnode->volume->cell);
523 if (IS_ERR(key)) {
524 _leave(" = %ld [key]", PTR_ERR(key));
525 return ERR_CAST(key);
526 }
527
528 ret = afs_validate(vnode, key);
529 if (ret < 0) {
530 key_put(key);
531 _leave(" = %d [val]", ret);
532 return ERR_PTR(ret);
533 }
534
535 ret = afs_do_lookup(dir, dentry, &fid, key);
536 if (ret < 0) {
537 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
538 if (!IS_ERR(inode)) {
539 key_put(key);
540 goto success;
541 }
542
543 ret = PTR_ERR(inode);
544 key_put(key);
545 if (ret == -ENOENT) {
546 d_add(dentry, NULL);
547 _leave(" = NULL [negative]");
548 return NULL;
549 }
550 _leave(" = %d [do]", ret);
551 return ERR_PTR(ret);
552 }
553 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
554
555 /* instantiate the dentry */
556 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
557 key_put(key);
558 if (IS_ERR(inode)) {
559 _leave(" = %ld", PTR_ERR(inode));
560 return ERR_CAST(inode);
561 }
562
563 success:
564 d_add(dentry, inode);
565 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
566 fid.vnode,
567 fid.unique,
568 d_inode(dentry)->i_ino,
569 d_inode(dentry)->i_generation);
570
571 return NULL;
572 }
573
574 /*
575 * check that a dentry lookup hit has found a valid entry
576 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
577 * inode
578 */
579 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
580 {
581 struct afs_vnode *vnode, *dir;
582 struct afs_fid uninitialized_var(fid);
583 struct dentry *parent;
584 struct key *key;
585 void *dir_version;
586 int ret;
587
588 if (flags & LOOKUP_RCU)
589 return -ECHILD;
590
591 vnode = AFS_FS_I(d_inode(dentry));
592
593 if (d_really_is_positive(dentry))
594 _enter("{v={%x:%u} n=%pd fl=%lx},",
595 vnode->fid.vid, vnode->fid.vnode, dentry,
596 vnode->flags);
597 else
598 _enter("{neg n=%pd}", dentry);
599
600 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
601 if (IS_ERR(key))
602 key = NULL;
603
604 /* lock down the parent dentry so we can peer at it */
605 parent = dget_parent(dentry);
606 dir = AFS_FS_I(d_inode(parent));
607
608 /* validate the parent directory */
609 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
610 afs_validate(dir, key);
611
612 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
613 _debug("%pd: parent dir deleted", dentry);
614 goto out_bad;
615 }
616
617 dir_version = (void *) (unsigned long) dir->status.data_version;
618 if (dentry->d_fsdata == dir_version)
619 goto out_valid; /* the dir contents are unchanged */
620
621 _debug("dir modified");
622
623 /* search the directory for this vnode */
624 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
625 switch (ret) {
626 case 0:
627 /* the filename maps to something */
628 if (d_really_is_negative(dentry))
629 goto out_bad;
630 if (is_bad_inode(d_inode(dentry))) {
631 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
632 dentry);
633 goto out_bad;
634 }
635
636 /* if the vnode ID has changed, then the dirent points to a
637 * different file */
638 if (fid.vnode != vnode->fid.vnode) {
639 _debug("%pd: dirent changed [%u != %u]",
640 dentry, fid.vnode,
641 vnode->fid.vnode);
642 goto not_found;
643 }
644
645 /* if the vnode ID uniqifier has changed, then the file has
646 * been deleted and replaced, and the original vnode ID has
647 * been reused */
648 if (fid.unique != vnode->fid.unique) {
649 _debug("%pd: file deleted (uq %u -> %u I:%u)",
650 dentry, fid.unique,
651 vnode->fid.unique,
652 d_inode(dentry)->i_generation);
653 spin_lock(&vnode->lock);
654 set_bit(AFS_VNODE_DELETED, &vnode->flags);
655 spin_unlock(&vnode->lock);
656 goto not_found;
657 }
658 goto out_valid;
659
660 case -ENOENT:
661 /* the filename is unknown */
662 _debug("%pd: dirent not found", dentry);
663 if (d_really_is_positive(dentry))
664 goto not_found;
665 goto out_valid;
666
667 default:
668 _debug("failed to iterate dir %pd: %d",
669 parent, ret);
670 goto out_bad;
671 }
672
673 out_valid:
674 dentry->d_fsdata = dir_version;
675 dput(parent);
676 key_put(key);
677 _leave(" = 1 [valid]");
678 return 1;
679
680 /* the dirent, if it exists, now points to a different vnode */
681 not_found:
682 spin_lock(&dentry->d_lock);
683 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
684 spin_unlock(&dentry->d_lock);
685
686 out_bad:
687 _debug("dropping dentry %pd2", dentry);
688 dput(parent);
689 key_put(key);
690
691 _leave(" = 0 [bad]");
692 return 0;
693 }
694
695 /*
696 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
697 * sleep)
698 * - called from dput() when d_count is going to 0.
699 * - return 1 to request dentry be unhashed, 0 otherwise
700 */
701 static int afs_d_delete(const struct dentry *dentry)
702 {
703 _enter("%pd", dentry);
704
705 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
706 goto zap;
707
708 if (d_really_is_positive(dentry) &&
709 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
710 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
711 goto zap;
712
713 _leave(" = 0 [keep]");
714 return 0;
715
716 zap:
717 _leave(" = 1 [zap]");
718 return 1;
719 }
720
721 /*
722 * handle dentry release
723 */
724 static void afs_d_release(struct dentry *dentry)
725 {
726 _enter("%pd", dentry);
727 }
728
729 /*
730 * create a directory on an AFS filesystem
731 */
732 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
733 {
734 struct afs_file_status status;
735 struct afs_callback cb;
736 struct afs_server *server;
737 struct afs_vnode *dvnode, *vnode;
738 struct afs_fid fid;
739 struct inode *inode;
740 struct key *key;
741 int ret;
742
743 dvnode = AFS_FS_I(dir);
744
745 _enter("{%x:%u},{%pd},%ho",
746 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
747
748 key = afs_request_key(dvnode->volume->cell);
749 if (IS_ERR(key)) {
750 ret = PTR_ERR(key);
751 goto error;
752 }
753
754 mode |= S_IFDIR;
755 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
756 mode, &fid, &status, &cb, &server);
757 if (ret < 0)
758 goto mkdir_error;
759
760 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
761 if (IS_ERR(inode)) {
762 /* ENOMEM at a really inconvenient time - just abandon the new
763 * directory on the server */
764 ret = PTR_ERR(inode);
765 goto iget_error;
766 }
767
768 /* apply the status report we've got for the new vnode */
769 vnode = AFS_FS_I(inode);
770 spin_lock(&vnode->lock);
771 vnode->update_cnt++;
772 spin_unlock(&vnode->lock);
773 afs_vnode_finalise_status_update(vnode, server);
774 afs_put_server(server);
775
776 d_instantiate(dentry, inode);
777 if (d_unhashed(dentry)) {
778 _debug("not hashed");
779 d_rehash(dentry);
780 }
781 key_put(key);
782 _leave(" = 0");
783 return 0;
784
785 iget_error:
786 afs_put_server(server);
787 mkdir_error:
788 key_put(key);
789 error:
790 d_drop(dentry);
791 _leave(" = %d", ret);
792 return ret;
793 }
794
795 /*
796 * remove a directory from an AFS filesystem
797 */
798 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
799 {
800 struct afs_vnode *dvnode, *vnode;
801 struct key *key;
802 int ret;
803
804 dvnode = AFS_FS_I(dir);
805
806 _enter("{%x:%u},{%pd}",
807 dvnode->fid.vid, dvnode->fid.vnode, dentry);
808
809 key = afs_request_key(dvnode->volume->cell);
810 if (IS_ERR(key)) {
811 ret = PTR_ERR(key);
812 goto error;
813 }
814
815 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
816 if (ret < 0)
817 goto rmdir_error;
818
819 if (d_really_is_positive(dentry)) {
820 vnode = AFS_FS_I(d_inode(dentry));
821 clear_nlink(&vnode->vfs_inode);
822 set_bit(AFS_VNODE_DELETED, &vnode->flags);
823 afs_discard_callback_on_delete(vnode);
824 }
825
826 key_put(key);
827 _leave(" = 0");
828 return 0;
829
830 rmdir_error:
831 key_put(key);
832 error:
833 _leave(" = %d", ret);
834 return ret;
835 }
836
837 /*
838 * remove a file from an AFS filesystem
839 */
840 static int afs_unlink(struct inode *dir, struct dentry *dentry)
841 {
842 struct afs_vnode *dvnode, *vnode;
843 struct key *key;
844 int ret;
845
846 dvnode = AFS_FS_I(dir);
847
848 _enter("{%x:%u},{%pd}",
849 dvnode->fid.vid, dvnode->fid.vnode, dentry);
850
851 ret = -ENAMETOOLONG;
852 if (dentry->d_name.len >= AFSNAMEMAX)
853 goto error;
854
855 key = afs_request_key(dvnode->volume->cell);
856 if (IS_ERR(key)) {
857 ret = PTR_ERR(key);
858 goto error;
859 }
860
861 if (d_really_is_positive(dentry)) {
862 vnode = AFS_FS_I(d_inode(dentry));
863
864 /* make sure we have a callback promise on the victim */
865 ret = afs_validate(vnode, key);
866 if (ret < 0)
867 goto error;
868 }
869
870 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
871 if (ret < 0)
872 goto remove_error;
873
874 if (d_really_is_positive(dentry)) {
875 /* if the file wasn't deleted due to excess hard links, the
876 * fileserver will break the callback promise on the file - if
877 * it had one - before it returns to us, and if it was deleted,
878 * it won't
879 *
880 * however, if we didn't have a callback promise outstanding,
881 * or it was outstanding on a different server, then it won't
882 * break it either...
883 */
884 vnode = AFS_FS_I(d_inode(dentry));
885 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
886 _debug("AFS_VNODE_DELETED");
887 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
888 _debug("AFS_VNODE_CB_BROKEN");
889 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
890 ret = afs_validate(vnode, key);
891 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
892 }
893
894 key_put(key);
895 _leave(" = 0");
896 return 0;
897
898 remove_error:
899 key_put(key);
900 error:
901 _leave(" = %d", ret);
902 return ret;
903 }
904
905 /*
906 * create a regular file on an AFS filesystem
907 */
908 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
909 bool excl)
910 {
911 struct afs_file_status status;
912 struct afs_callback cb;
913 struct afs_server *server;
914 struct afs_vnode *dvnode, *vnode;
915 struct afs_fid fid;
916 struct inode *inode;
917 struct key *key;
918 int ret;
919
920 dvnode = AFS_FS_I(dir);
921
922 _enter("{%x:%u},{%pd},%ho,",
923 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
924
925 key = afs_request_key(dvnode->volume->cell);
926 if (IS_ERR(key)) {
927 ret = PTR_ERR(key);
928 goto error;
929 }
930
931 mode |= S_IFREG;
932 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
933 mode, &fid, &status, &cb, &server);
934 if (ret < 0)
935 goto create_error;
936
937 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
938 if (IS_ERR(inode)) {
939 /* ENOMEM at a really inconvenient time - just abandon the new
940 * directory on the server */
941 ret = PTR_ERR(inode);
942 goto iget_error;
943 }
944
945 /* apply the status report we've got for the new vnode */
946 vnode = AFS_FS_I(inode);
947 spin_lock(&vnode->lock);
948 vnode->update_cnt++;
949 spin_unlock(&vnode->lock);
950 afs_vnode_finalise_status_update(vnode, server);
951 afs_put_server(server);
952
953 d_instantiate(dentry, inode);
954 if (d_unhashed(dentry)) {
955 _debug("not hashed");
956 d_rehash(dentry);
957 }
958 key_put(key);
959 _leave(" = 0");
960 return 0;
961
962 iget_error:
963 afs_put_server(server);
964 create_error:
965 key_put(key);
966 error:
967 d_drop(dentry);
968 _leave(" = %d", ret);
969 return ret;
970 }
971
972 /*
973 * create a hard link between files in an AFS filesystem
974 */
975 static int afs_link(struct dentry *from, struct inode *dir,
976 struct dentry *dentry)
977 {
978 struct afs_vnode *dvnode, *vnode;
979 struct key *key;
980 int ret;
981
982 vnode = AFS_FS_I(d_inode(from));
983 dvnode = AFS_FS_I(dir);
984
985 _enter("{%x:%u},{%x:%u},{%pd}",
986 vnode->fid.vid, vnode->fid.vnode,
987 dvnode->fid.vid, dvnode->fid.vnode,
988 dentry);
989
990 key = afs_request_key(dvnode->volume->cell);
991 if (IS_ERR(key)) {
992 ret = PTR_ERR(key);
993 goto error;
994 }
995
996 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
997 if (ret < 0)
998 goto link_error;
999
1000 ihold(&vnode->vfs_inode);
1001 d_instantiate(dentry, &vnode->vfs_inode);
1002 key_put(key);
1003 _leave(" = 0");
1004 return 0;
1005
1006 link_error:
1007 key_put(key);
1008 error:
1009 d_drop(dentry);
1010 _leave(" = %d", ret);
1011 return ret;
1012 }
1013
1014 /*
1015 * create a symlink in an AFS filesystem
1016 */
1017 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1018 const char *content)
1019 {
1020 struct afs_file_status status;
1021 struct afs_server *server;
1022 struct afs_vnode *dvnode, *vnode;
1023 struct afs_fid fid;
1024 struct inode *inode;
1025 struct key *key;
1026 int ret;
1027
1028 dvnode = AFS_FS_I(dir);
1029
1030 _enter("{%x:%u},{%pd},%s",
1031 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1032 content);
1033
1034 ret = -EINVAL;
1035 if (strlen(content) >= AFSPATHMAX)
1036 goto error;
1037
1038 key = afs_request_key(dvnode->volume->cell);
1039 if (IS_ERR(key)) {
1040 ret = PTR_ERR(key);
1041 goto error;
1042 }
1043
1044 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
1045 &fid, &status, &server);
1046 if (ret < 0)
1047 goto create_error;
1048
1049 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
1050 if (IS_ERR(inode)) {
1051 /* ENOMEM at a really inconvenient time - just abandon the new
1052 * directory on the server */
1053 ret = PTR_ERR(inode);
1054 goto iget_error;
1055 }
1056
1057 /* apply the status report we've got for the new vnode */
1058 vnode = AFS_FS_I(inode);
1059 spin_lock(&vnode->lock);
1060 vnode->update_cnt++;
1061 spin_unlock(&vnode->lock);
1062 afs_vnode_finalise_status_update(vnode, server);
1063 afs_put_server(server);
1064
1065 d_instantiate(dentry, inode);
1066 if (d_unhashed(dentry)) {
1067 _debug("not hashed");
1068 d_rehash(dentry);
1069 }
1070 key_put(key);
1071 _leave(" = 0");
1072 return 0;
1073
1074 iget_error:
1075 afs_put_server(server);
1076 create_error:
1077 key_put(key);
1078 error:
1079 d_drop(dentry);
1080 _leave(" = %d", ret);
1081 return ret;
1082 }
1083
1084 /*
1085 * rename a file in an AFS filesystem and/or move it between directories
1086 */
1087 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1088 struct inode *new_dir, struct dentry *new_dentry,
1089 unsigned int flags)
1090 {
1091 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1092 struct key *key;
1093 int ret;
1094
1095 if (flags)
1096 return -EINVAL;
1097
1098 vnode = AFS_FS_I(d_inode(old_dentry));
1099 orig_dvnode = AFS_FS_I(old_dir);
1100 new_dvnode = AFS_FS_I(new_dir);
1101
1102 _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}",
1103 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1104 vnode->fid.vid, vnode->fid.vnode,
1105 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1106 new_dentry);
1107
1108 key = afs_request_key(orig_dvnode->volume->cell);
1109 if (IS_ERR(key)) {
1110 ret = PTR_ERR(key);
1111 goto error;
1112 }
1113
1114 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
1115 old_dentry->d_name.name,
1116 new_dentry->d_name.name);
1117 if (ret < 0)
1118 goto rename_error;
1119 key_put(key);
1120 _leave(" = 0");
1121 return 0;
1122
1123 rename_error:
1124 key_put(key);
1125 error:
1126 d_drop(new_dentry);
1127 _leave(" = %d", ret);
1128 return ret;
1129 }
Linux kernel stable tree