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spi/pxa2xx: Add CE4100 support
[zen-stable.git] / fs / afs / dir.c
blob5439e1bc9a86a5702094eaea35eb4c6ebd8e67fe
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/pagemap.h>
17 #include <linux/ctype.h>
18 #include <linux/sched.h>
19 #include "internal.h"
20
21 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
22 struct nameidata *nd);
23 static int afs_dir_open(struct inode *inode, struct file *file);
24 static int afs_readdir(struct file *file, void *dirent, filldir_t filldir);
25 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd);
26 static int afs_d_delete(struct dentry *dentry);
27 static void afs_d_release(struct dentry *dentry);
28 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
29 loff_t fpos, u64 ino, unsigned dtype);
30 static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
31 struct nameidata *nd);
32 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
33 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
34 static int afs_unlink(struct inode *dir, struct dentry *dentry);
35 static int afs_link(struct dentry *from, struct inode *dir,
36 struct dentry *dentry);
37 static int afs_symlink(struct inode *dir, struct dentry *dentry,
38 const char *content);
39 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
40 struct inode *new_dir, struct dentry *new_dentry);
41
42 const struct file_operations afs_dir_file_operations = {
43 .open = afs_dir_open,
44 .release = afs_release,
45 .readdir = afs_readdir,
46 .lock = afs_lock,
47 .llseek = generic_file_llseek,
48 };
49
50 const struct inode_operations afs_dir_inode_operations = {
51 .create = afs_create,
52 .lookup = afs_lookup,
53 .link = afs_link,
54 .unlink = afs_unlink,
55 .symlink = afs_symlink,
56 .mkdir = afs_mkdir,
57 .rmdir = afs_rmdir,
58 .rename = afs_rename,
59 .permission = afs_permission,
60 .getattr = afs_getattr,
61 .setattr = afs_setattr,
62 };
63
64 static const struct dentry_operations afs_fs_dentry_operations = {
65 .d_revalidate = afs_d_revalidate,
66 .d_delete = afs_d_delete,
67 .d_release = afs_d_release,
68 };
69
70 #define AFS_DIR_HASHTBL_SIZE 128
71 #define AFS_DIR_DIRENT_SIZE 32
72 #define AFS_DIRENT_PER_BLOCK 64
73
74 union afs_dirent {
75 struct {
76 uint8_t valid;
77 uint8_t unused[1];
78 __be16 hash_next;
79 __be32 vnode;
80 __be32 unique;
81 uint8_t name[16];
82 uint8_t overflow[4]; /* if any char of the name (inc
83 * NUL) reaches here, consume
84 * the next dirent too */
85 } u;
86 uint8_t extended_name[32];
87 };
88
89 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
90 struct afs_dir_pagehdr {
91 __be16 npages;
92 __be16 magic;
93 #define AFS_DIR_MAGIC htons(1234)
94 uint8_t nentries;
95 uint8_t bitmap[8];
96 uint8_t pad[19];
97 };
98
99 /* directory block layout */
100 union afs_dir_block {
101
102 struct afs_dir_pagehdr pagehdr;
103
104 struct {
105 struct afs_dir_pagehdr pagehdr;
106 uint8_t alloc_ctrs[128];
107 /* dir hash table */
108 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
109 } hdr;
110
111 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
112 };
113
114 /* layout on a linux VM page */
115 struct afs_dir_page {
116 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
117 };
118
119 struct afs_lookup_cookie {
120 struct afs_fid fid;
121 const char *name;
122 size_t nlen;
123 int found;
124 };
125
126 /*
127 * check that a directory page is valid
128 */
129 static inline void afs_dir_check_page(struct inode *dir, struct page *page)
130 {
131 struct afs_dir_page *dbuf;
132 loff_t latter;
133 int tmp, qty;
134
135 #if 0
136 /* check the page count */
137 qty = desc.size / sizeof(dbuf->blocks[0]);
138 if (qty == 0)
139 goto error;
140
141 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
142 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
143 __func__, dir->i_ino, qty,
144 ntohs(dbuf->blocks[0].pagehdr.npages));
145 goto error;
146 }
147 #endif
148
149 /* determine how many magic numbers there should be in this page */
150 latter = dir->i_size - page_offset(page);
151 if (latter >= PAGE_SIZE)
152 qty = PAGE_SIZE;
153 else
154 qty = latter;
155 qty /= sizeof(union afs_dir_block);
156
157 /* check them */
158 dbuf = page_address(page);
159 for (tmp = 0; tmp < qty; tmp++) {
160 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
161 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
162 __func__, dir->i_ino, tmp, qty,
163 ntohs(dbuf->blocks[tmp].pagehdr.magic));
164 goto error;
165 }
166 }
167
168 SetPageChecked(page);
169 return;
170
171 error:
172 SetPageChecked(page);
173 SetPageError(page);
174 }
175
176 /*
177 * discard a page cached in the pagecache
178 */
179 static inline void afs_dir_put_page(struct page *page)
180 {
181 kunmap(page);
182 page_cache_release(page);
183 }
184
185 /*
186 * get a page into the pagecache
187 */
188 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
189 struct key *key)
190 {
191 struct page *page;
192 _enter("{%lu},%lu", dir->i_ino, index);
193
194 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
195 if (!IS_ERR(page)) {
196 kmap(page);
197 if (!PageChecked(page))
198 afs_dir_check_page(dir, page);
199 if (PageError(page))
200 goto fail;
201 }
202 return page;
203
204 fail:
205 afs_dir_put_page(page);
206 _leave(" = -EIO");
207 return ERR_PTR(-EIO);
208 }
209
210 /*
211 * open an AFS directory file
212 */
213 static int afs_dir_open(struct inode *inode, struct file *file)
214 {
215 _enter("{%lu}", inode->i_ino);
216
217 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
218 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
219
220 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
221 return -ENOENT;
222
223 return afs_open(inode, file);
224 }
225
226 /*
227 * deal with one block in an AFS directory
228 */
229 static int afs_dir_iterate_block(unsigned *fpos,
230 union afs_dir_block *block,
231 unsigned blkoff,
232 void *cookie,
233 filldir_t filldir)
234 {
235 union afs_dirent *dire;
236 unsigned offset, next, curr;
237 size_t nlen;
238 int tmp, ret;
239
240 _enter("%u,%x,%p,,",*fpos,blkoff,block);
241
242 curr = (*fpos - blkoff) / sizeof(union afs_dirent);
243
244 /* walk through the block, an entry at a time */
245 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
246 offset < AFS_DIRENT_PER_BLOCK;
247 offset = next
248 ) {
249 next = offset + 1;
250
251 /* skip entries marked unused in the bitmap */
252 if (!(block->pagehdr.bitmap[offset / 8] &
253 (1 << (offset % 8)))) {
254 _debug("ENT[%Zu.%u]: unused",
255 blkoff / sizeof(union afs_dir_block), offset);
256 if (offset >= curr)
257 *fpos = blkoff +
258 next * sizeof(union afs_dirent);
259 continue;
260 }
261
262 /* got a valid entry */
263 dire = &block->dirents[offset];
264 nlen = strnlen(dire->u.name,
265 sizeof(*block) -
266 offset * sizeof(union afs_dirent));
267
268 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
269 blkoff / sizeof(union afs_dir_block), offset,
270 (offset < curr ? "skip" : "fill"),
271 nlen, dire->u.name);
272
273 /* work out where the next possible entry is */
274 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
275 if (next >= AFS_DIRENT_PER_BLOCK) {
276 _debug("ENT[%Zu.%u]:"
277 " %u travelled beyond end dir block"
278 " (len %u/%Zu)",
279 blkoff / sizeof(union afs_dir_block),
280 offset, next, tmp, nlen);
281 return -EIO;
282 }
283 if (!(block->pagehdr.bitmap[next / 8] &
284 (1 << (next % 8)))) {
285 _debug("ENT[%Zu.%u]:"
286 " %u unmarked extension (len %u/%Zu)",
287 blkoff / sizeof(union afs_dir_block),
288 offset, next, tmp, nlen);
289 return -EIO;
290 }
291
292 _debug("ENT[%Zu.%u]: ext %u/%Zu",
293 blkoff / sizeof(union afs_dir_block),
294 next, tmp, nlen);
295 next++;
296 }
297
298 /* skip if starts before the current position */
299 if (offset < curr)
300 continue;
301
302 /* found the next entry */
303 ret = filldir(cookie,
304 dire->u.name,
305 nlen,
306 blkoff + offset * sizeof(union afs_dirent),
307 ntohl(dire->u.vnode),
308 filldir == afs_lookup_filldir ?
309 ntohl(dire->u.unique) : DT_UNKNOWN);
310 if (ret < 0) {
311 _leave(" = 0 [full]");
312 return 0;
313 }
314
315 *fpos = blkoff + next * sizeof(union afs_dirent);
316 }
317
318 _leave(" = 1 [more]");
319 return 1;
320 }
321
322 /*
323 * iterate through the data blob that lists the contents of an AFS directory
324 */
325 static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
326 filldir_t filldir, struct key *key)
327 {
328 union afs_dir_block *dblock;
329 struct afs_dir_page *dbuf;
330 struct page *page;
331 unsigned blkoff, limit;
332 int ret;
333
334 _enter("{%lu},%u,,", dir->i_ino, *fpos);
335
336 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
337 _leave(" = -ESTALE");
338 return -ESTALE;
339 }
340
341 /* round the file position up to the next entry boundary */
342 *fpos += sizeof(union afs_dirent) - 1;
343 *fpos &= ~(sizeof(union afs_dirent) - 1);
344
345 /* walk through the blocks in sequence */
346 ret = 0;
347 while (*fpos < dir->i_size) {
348 blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1);
349
350 /* fetch the appropriate page from the directory */
351 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
352 if (IS_ERR(page)) {
353 ret = PTR_ERR(page);
354 break;
355 }
356
357 limit = blkoff & ~(PAGE_SIZE - 1);
358
359 dbuf = page_address(page);
360
361 /* deal with the individual blocks stashed on this page */
362 do {
363 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
364 sizeof(union afs_dir_block)];
365 ret = afs_dir_iterate_block(fpos, dblock, blkoff,
366 cookie, filldir);
367 if (ret != 1) {
368 afs_dir_put_page(page);
369 goto out;
370 }
371
372 blkoff += sizeof(union afs_dir_block);
373
374 } while (*fpos < dir->i_size && blkoff < limit);
375
376 afs_dir_put_page(page);
377 ret = 0;
378 }
379
380 out:
381 _leave(" = %d", ret);
382 return ret;
383 }
384
385 /*
386 * read an AFS directory
387 */
388 static int afs_readdir(struct file *file, void *cookie, filldir_t filldir)
389 {
390 unsigned fpos;
391 int ret;
392
393 _enter("{%Ld,{%lu}}",
394 file->f_pos, file->f_path.dentry->d_inode->i_ino);
395
396 ASSERT(file->private_data != NULL);
397
398 fpos = file->f_pos;
399 ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos,
400 cookie, filldir, file->private_data);
401 file->f_pos = fpos;
402
403 _leave(" = %d", ret);
404 return ret;
405 }
406
407 /*
408 * search the directory for a name
409 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
410 * uniquifier through dtype
411 */
412 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
413 loff_t fpos, u64 ino, unsigned dtype)
414 {
415 struct afs_lookup_cookie *cookie = _cookie;
416
417 _enter("{%s,%Zu},%s,%u,,%llu,%u",
418 cookie->name, cookie->nlen, name, nlen,
419 (unsigned long long) ino, dtype);
420
421 /* insanity checks first */
422 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
423 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
424
425 if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) {
426 _leave(" = 0 [no]");
427 return 0;
428 }
429
430 cookie->fid.vnode = ino;
431 cookie->fid.unique = dtype;
432 cookie->found = 1;
433
434 _leave(" = -1 [found]");
435 return -1;
436 }
437
438 /*
439 * do a lookup in a directory
440 * - just returns the FID the dentry name maps to if found
441 */
442 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
443 struct afs_fid *fid, struct key *key)
444 {
445 struct afs_lookup_cookie cookie;
446 struct afs_super_info *as;
447 unsigned fpos;
448 int ret;
449
450 _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
451
452 as = dir->i_sb->s_fs_info;
453
454 /* search the directory */
455 cookie.name = dentry->d_name.name;
456 cookie.nlen = dentry->d_name.len;
457 cookie.fid.vid = as->volume->vid;
458 cookie.found = 0;
459
460 fpos = 0;
461 ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir,
462 key);
463 if (ret < 0) {
464 _leave(" = %d [iter]", ret);
465 return ret;
466 }
467
468 ret = -ENOENT;
469 if (!cookie.found) {
470 _leave(" = -ENOENT [not found]");
471 return -ENOENT;
472 }
473
474 *fid = cookie.fid;
475 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
476 return 0;
477 }
478
479 /*
480 * Try to auto mount the mountpoint with pseudo directory, if the autocell
481 * operation is setted.
482 */
483 static struct inode *afs_try_auto_mntpt(
484 int ret, struct dentry *dentry, struct inode *dir, struct key *key,
485 struct afs_fid *fid)
486 {
487 const char *devname = dentry->d_name.name;
488 struct afs_vnode *vnode = AFS_FS_I(dir);
489 struct inode *inode;
490
491 _enter("%d, %p{%s}, {%x:%u}, %p",
492 ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key);
493
494 if (ret != -ENOENT ||
495 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
496 goto out;
497
498 inode = afs_iget_autocell(dir, devname, strlen(devname), key);
499 if (IS_ERR(inode)) {
500 ret = PTR_ERR(inode);
501 goto out;
502 }
503
504 *fid = AFS_FS_I(inode)->fid;
505 _leave("= %p", inode);
506 return inode;
507
508 out:
509 _leave("= %d", ret);
510 return ERR_PTR(ret);
511 }
512
513 /*
514 * look up an entry in a directory
515 */
516 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
517 struct nameidata *nd)
518 {
519 struct afs_vnode *vnode;
520 struct afs_fid fid;
521 struct inode *inode;
522 struct key *key;
523 int ret;
524
525 vnode = AFS_FS_I(dir);
526
527 _enter("{%x:%u},%p{%s},",
528 vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
529
530 ASSERTCMP(dentry->d_inode, ==, NULL);
531
532 if (dentry->d_name.len >= AFSNAMEMAX) {
533 _leave(" = -ENAMETOOLONG");
534 return ERR_PTR(-ENAMETOOLONG);
535 }
536
537 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
538 _leave(" = -ESTALE");
539 return ERR_PTR(-ESTALE);
540 }
541
542 key = afs_request_key(vnode->volume->cell);
543 if (IS_ERR(key)) {
544 _leave(" = %ld [key]", PTR_ERR(key));
545 return ERR_CAST(key);
546 }
547
548 ret = afs_validate(vnode, key);
549 if (ret < 0) {
550 key_put(key);
551 _leave(" = %d [val]", ret);
552 return ERR_PTR(ret);
553 }
554
555 ret = afs_do_lookup(dir, dentry, &fid, key);
556 if (ret < 0) {
557 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
558 if (!IS_ERR(inode)) {
559 key_put(key);
560 goto success;
561 }
562
563 ret = PTR_ERR(inode);
564 key_put(key);
565 if (ret == -ENOENT) {
566 d_add(dentry, NULL);
567 _leave(" = NULL [negative]");
568 return NULL;
569 }
570 _leave(" = %d [do]", ret);
571 return ERR_PTR(ret);
572 }
573 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
574
575 /* instantiate the dentry */
576 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
577 key_put(key);
578 if (IS_ERR(inode)) {
579 _leave(" = %ld", PTR_ERR(inode));
580 return ERR_CAST(inode);
581 }
582
583 success:
584 dentry->d_op = &afs_fs_dentry_operations;
585
586 d_add(dentry, inode);
587 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
588 fid.vnode,
589 fid.unique,
590 dentry->d_inode->i_ino,
591 (unsigned long long)dentry->d_inode->i_version);
592
593 return NULL;
594 }
595
596 /*
597 * check that a dentry lookup hit has found a valid entry
598 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
599 * inode
600 */
601 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
602 {
603 struct afs_vnode *vnode, *dir;
604 struct afs_fid uninitialized_var(fid);
605 struct dentry *parent;
606 struct key *key;
607 void *dir_version;
608 int ret;
609
610 vnode = AFS_FS_I(dentry->d_inode);
611
612 if (dentry->d_inode)
613 _enter("{v={%x:%u} n=%s fl=%lx},",
614 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
615 vnode->flags);
616 else
617 _enter("{neg n=%s}", dentry->d_name.name);
618
619 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
620 if (IS_ERR(key))
621 key = NULL;
622
623 /* lock down the parent dentry so we can peer at it */
624 parent = dget_parent(dentry);
625 if (!parent->d_inode)
626 goto out_bad;
627
628 dir = AFS_FS_I(parent->d_inode);
629
630 /* validate the parent directory */
631 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
632 afs_validate(dir, key);
633
634 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
635 _debug("%s: parent dir deleted", dentry->d_name.name);
636 goto out_bad;
637 }
638
639 dir_version = (void *) (unsigned long) dir->status.data_version;
640 if (dentry->d_fsdata == dir_version)
641 goto out_valid; /* the dir contents are unchanged */
642
643 _debug("dir modified");
644
645 /* search the directory for this vnode */
646 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
647 switch (ret) {
648 case 0:
649 /* the filename maps to something */
650 if (!dentry->d_inode)
651 goto out_bad;
652 if (is_bad_inode(dentry->d_inode)) {
653 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
654 parent->d_name.name, dentry->d_name.name);
655 goto out_bad;
656 }
657
658 /* if the vnode ID has changed, then the dirent points to a
659 * different file */
660 if (fid.vnode != vnode->fid.vnode) {
661 _debug("%s: dirent changed [%u != %u]",
662 dentry->d_name.name, fid.vnode,
663 vnode->fid.vnode);
664 goto not_found;
665 }
666
667 /* if the vnode ID uniqifier has changed, then the file has
668 * been deleted and replaced, and the original vnode ID has
669 * been reused */
670 if (fid.unique != vnode->fid.unique) {
671 _debug("%s: file deleted (uq %u -> %u I:%llu)",
672 dentry->d_name.name, fid.unique,
673 vnode->fid.unique,
674 (unsigned long long)dentry->d_inode->i_version);
675 spin_lock(&vnode->lock);
676 set_bit(AFS_VNODE_DELETED, &vnode->flags);
677 spin_unlock(&vnode->lock);
678 goto not_found;
679 }
680 goto out_valid;
681
682 case -ENOENT:
683 /* the filename is unknown */
684 _debug("%s: dirent not found", dentry->d_name.name);
685 if (dentry->d_inode)
686 goto not_found;
687 goto out_valid;
688
689 default:
690 _debug("failed to iterate dir %s: %d",
691 parent->d_name.name, ret);
692 goto out_bad;
693 }
694
695 out_valid:
696 dentry->d_fsdata = dir_version;
697 out_skip:
698 dput(parent);
699 key_put(key);
700 _leave(" = 1 [valid]");
701 return 1;
702
703 /* the dirent, if it exists, now points to a different vnode */
704 not_found:
705 spin_lock(&dentry->d_lock);
706 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
707 spin_unlock(&dentry->d_lock);
708
709 out_bad:
710 if (dentry->d_inode) {
711 /* don't unhash if we have submounts */
712 if (have_submounts(dentry))
713 goto out_skip;
714 }
715
716 _debug("dropping dentry %s/%s",
717 parent->d_name.name, dentry->d_name.name);
718 shrink_dcache_parent(dentry);
719 d_drop(dentry);
720 dput(parent);
721 key_put(key);
722
723 _leave(" = 0 [bad]");
724 return 0;
725 }
726
727 /*
728 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
729 * sleep)
730 * - called from dput() when d_count is going to 0.
731 * - return 1 to request dentry be unhashed, 0 otherwise
732 */
733 static int afs_d_delete(struct dentry *dentry)
734 {
735 _enter("%s", dentry->d_name.name);
736
737 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
738 goto zap;
739
740 if (dentry->d_inode &&
741 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) ||
742 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags)))
743 goto zap;
744
745 _leave(" = 0 [keep]");
746 return 0;
747
748 zap:
749 _leave(" = 1 [zap]");
750 return 1;
751 }
752
753 /*
754 * handle dentry release
755 */
756 static void afs_d_release(struct dentry *dentry)
757 {
758 _enter("%s", dentry->d_name.name);
759 }
760
761 /*
762 * create a directory on an AFS filesystem
763 */
764 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
765 {
766 struct afs_file_status status;
767 struct afs_callback cb;
768 struct afs_server *server;
769 struct afs_vnode *dvnode, *vnode;
770 struct afs_fid fid;
771 struct inode *inode;
772 struct key *key;
773 int ret;
774
775 dvnode = AFS_FS_I(dir);
776
777 _enter("{%x:%u},{%s},%o",
778 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
779
780 ret = -ENAMETOOLONG;
781 if (dentry->d_name.len >= AFSNAMEMAX)
782 goto error;
783
784 key = afs_request_key(dvnode->volume->cell);
785 if (IS_ERR(key)) {
786 ret = PTR_ERR(key);
787 goto error;
788 }
789
790 mode |= S_IFDIR;
791 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
792 mode, &fid, &status, &cb, &server);
793 if (ret < 0)
794 goto mkdir_error;
795
796 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
797 if (IS_ERR(inode)) {
798 /* ENOMEM at a really inconvenient time - just abandon the new
799 * directory on the server */
800 ret = PTR_ERR(inode);
801 goto iget_error;
802 }
803
804 /* apply the status report we've got for the new vnode */
805 vnode = AFS_FS_I(inode);
806 spin_lock(&vnode->lock);
807 vnode->update_cnt++;
808 spin_unlock(&vnode->lock);
809 afs_vnode_finalise_status_update(vnode, server);
810 afs_put_server(server);
811
812 d_instantiate(dentry, inode);
813 if (d_unhashed(dentry)) {
814 _debug("not hashed");
815 d_rehash(dentry);
816 }
817 key_put(key);
818 _leave(" = 0");
819 return 0;
820
821 iget_error:
822 afs_put_server(server);
823 mkdir_error:
824 key_put(key);
825 error:
826 d_drop(dentry);
827 _leave(" = %d", ret);
828 return ret;
829 }
830
831 /*
832 * remove a directory from an AFS filesystem
833 */
834 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
835 {
836 struct afs_vnode *dvnode, *vnode;
837 struct key *key;
838 int ret;
839
840 dvnode = AFS_FS_I(dir);
841
842 _enter("{%x:%u},{%s}",
843 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
844
845 ret = -ENAMETOOLONG;
846 if (dentry->d_name.len >= AFSNAMEMAX)
847 goto error;
848
849 key = afs_request_key(dvnode->volume->cell);
850 if (IS_ERR(key)) {
851 ret = PTR_ERR(key);
852 goto error;
853 }
854
855 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
856 if (ret < 0)
857 goto rmdir_error;
858
859 if (dentry->d_inode) {
860 vnode = AFS_FS_I(dentry->d_inode);
861 clear_nlink(&vnode->vfs_inode);
862 set_bit(AFS_VNODE_DELETED, &vnode->flags);
863 afs_discard_callback_on_delete(vnode);
864 }
865
866 key_put(key);
867 _leave(" = 0");
868 return 0;
869
870 rmdir_error:
871 key_put(key);
872 error:
873 _leave(" = %d", ret);
874 return ret;
875 }
876
877 /*
878 * remove a file from an AFS filesystem
879 */
880 static int afs_unlink(struct inode *dir, struct dentry *dentry)
881 {
882 struct afs_vnode *dvnode, *vnode;
883 struct key *key;
884 int ret;
885
886 dvnode = AFS_FS_I(dir);
887
888 _enter("{%x:%u},{%s}",
889 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
890
891 ret = -ENAMETOOLONG;
892 if (dentry->d_name.len >= AFSNAMEMAX)
893 goto error;
894
895 key = afs_request_key(dvnode->volume->cell);
896 if (IS_ERR(key)) {
897 ret = PTR_ERR(key);
898 goto error;
899 }
900
901 if (dentry->d_inode) {
902 vnode = AFS_FS_I(dentry->d_inode);
903
904 /* make sure we have a callback promise on the victim */
905 ret = afs_validate(vnode, key);
906 if (ret < 0)
907 goto error;
908 }
909
910 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
911 if (ret < 0)
912 goto remove_error;
913
914 if (dentry->d_inode) {
915 /* if the file wasn't deleted due to excess hard links, the
916 * fileserver will break the callback promise on the file - if
917 * it had one - before it returns to us, and if it was deleted,
918 * it won't
919 *
920 * however, if we didn't have a callback promise outstanding,
921 * or it was outstanding on a different server, then it won't
922 * break it either...
923 */
924 vnode = AFS_FS_I(dentry->d_inode);
925 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
926 _debug("AFS_VNODE_DELETED");
927 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
928 _debug("AFS_VNODE_CB_BROKEN");
929 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
930 ret = afs_validate(vnode, key);
931 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
932 }
933
934 key_put(key);
935 _leave(" = 0");
936 return 0;
937
938 remove_error:
939 key_put(key);
940 error:
941 _leave(" = %d", ret);
942 return ret;
943 }
944
945 /*
946 * create a regular file on an AFS filesystem
947 */
948 static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
949 struct nameidata *nd)
950 {
951 struct afs_file_status status;
952 struct afs_callback cb;
953 struct afs_server *server;
954 struct afs_vnode *dvnode, *vnode;
955 struct afs_fid fid;
956 struct inode *inode;
957 struct key *key;
958 int ret;
959
960 dvnode = AFS_FS_I(dir);
961
962 _enter("{%x:%u},{%s},%o,",
963 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
964
965 ret = -ENAMETOOLONG;
966 if (dentry->d_name.len >= AFSNAMEMAX)
967 goto error;
968
969 key = afs_request_key(dvnode->volume->cell);
970 if (IS_ERR(key)) {
971 ret = PTR_ERR(key);
972 goto error;
973 }
974
975 mode |= S_IFREG;
976 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
977 mode, &fid, &status, &cb, &server);
978 if (ret < 0)
979 goto create_error;
980
981 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
982 if (IS_ERR(inode)) {
983 /* ENOMEM at a really inconvenient time - just abandon the new
984 * directory on the server */
985 ret = PTR_ERR(inode);
986 goto iget_error;
987 }
988
989 /* apply the status report we've got for the new vnode */
990 vnode = AFS_FS_I(inode);
991 spin_lock(&vnode->lock);
992 vnode->update_cnt++;
993 spin_unlock(&vnode->lock);
994 afs_vnode_finalise_status_update(vnode, server);
995 afs_put_server(server);
996
997 d_instantiate(dentry, inode);
998 if (d_unhashed(dentry)) {
999 _debug("not hashed");
1000 d_rehash(dentry);
1001 }
1002 key_put(key);
1003 _leave(" = 0");
1004 return 0;
1005
1006 iget_error:
1007 afs_put_server(server);
1008 create_error:
1009 key_put(key);
1010 error:
1011 d_drop(dentry);
1012 _leave(" = %d", ret);
1013 return ret;
1014 }
1015
1016 /*
1017 * create a hard link between files in an AFS filesystem
1018 */
1019 static int afs_link(struct dentry *from, struct inode *dir,
1020 struct dentry *dentry)
1021 {
1022 struct afs_vnode *dvnode, *vnode;
1023 struct key *key;
1024 int ret;
1025
1026 vnode = AFS_FS_I(from->d_inode);
1027 dvnode = AFS_FS_I(dir);
1028
1029 _enter("{%x:%u},{%x:%u},{%s}",
1030 vnode->fid.vid, vnode->fid.vnode,
1031 dvnode->fid.vid, dvnode->fid.vnode,
1032 dentry->d_name.name);
1033
1034 ret = -ENAMETOOLONG;
1035 if (dentry->d_name.len >= AFSNAMEMAX)
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_link(dvnode, vnode, key, dentry->d_name.name);
1045 if (ret < 0)
1046 goto link_error;
1047
1048 ihold(&vnode->vfs_inode);
1049 d_instantiate(dentry, &vnode->vfs_inode);
1050 key_put(key);
1051 _leave(" = 0");
1052 return 0;
1053
1054 link_error:
1055 key_put(key);
1056 error:
1057 d_drop(dentry);
1058 _leave(" = %d", ret);
1059 return ret;
1060 }
1061
1062 /*
1063 * create a symlink in an AFS filesystem
1064 */
1065 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1066 const char *content)
1067 {
1068 struct afs_file_status status;
1069 struct afs_server *server;
1070 struct afs_vnode *dvnode, *vnode;
1071 struct afs_fid fid;
1072 struct inode *inode;
1073 struct key *key;
1074 int ret;
1075
1076 dvnode = AFS_FS_I(dir);
1077
1078 _enter("{%x:%u},{%s},%s",
1079 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
1080 content);
1081
1082 ret = -ENAMETOOLONG;
1083 if (dentry->d_name.len >= AFSNAMEMAX)
1084 goto error;
1085
1086 ret = -EINVAL;
1087 if (strlen(content) >= AFSPATHMAX)
1088 goto error;
1089
1090 key = afs_request_key(dvnode->volume->cell);
1091 if (IS_ERR(key)) {
1092 ret = PTR_ERR(key);
1093 goto error;
1094 }
1095
1096 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
1097 &fid, &status, &server);
1098 if (ret < 0)
1099 goto create_error;
1100
1101 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
1102 if (IS_ERR(inode)) {
1103 /* ENOMEM at a really inconvenient time - just abandon the new
1104 * directory on the server */
1105 ret = PTR_ERR(inode);
1106 goto iget_error;
1107 }
1108
1109 /* apply the status report we've got for the new vnode */
1110 vnode = AFS_FS_I(inode);
1111 spin_lock(&vnode->lock);
1112 vnode->update_cnt++;
1113 spin_unlock(&vnode->lock);
1114 afs_vnode_finalise_status_update(vnode, server);
1115 afs_put_server(server);
1116
1117 d_instantiate(dentry, inode);
1118 if (d_unhashed(dentry)) {
1119 _debug("not hashed");
1120 d_rehash(dentry);
1121 }
1122 key_put(key);
1123 _leave(" = 0");
1124 return 0;
1125
1126 iget_error:
1127 afs_put_server(server);
1128 create_error:
1129 key_put(key);
1130 error:
1131 d_drop(dentry);
1132 _leave(" = %d", ret);
1133 return ret;
1134 }
1135
1136 /*
1137 * rename a file in an AFS filesystem and/or move it between directories
1138 */
1139 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1140 struct inode *new_dir, struct dentry *new_dentry)
1141 {
1142 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1143 struct key *key;
1144 int ret;
1145
1146 vnode = AFS_FS_I(old_dentry->d_inode);
1147 orig_dvnode = AFS_FS_I(old_dir);
1148 new_dvnode = AFS_FS_I(new_dir);
1149
1150 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
1151 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1152 vnode->fid.vid, vnode->fid.vnode,
1153 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1154 new_dentry->d_name.name);
1155
1156 ret = -ENAMETOOLONG;
1157 if (new_dentry->d_name.len >= AFSNAMEMAX)
1158 goto error;
1159
1160 key = afs_request_key(orig_dvnode->volume->cell);
1161 if (IS_ERR(key)) {
1162 ret = PTR_ERR(key);
1163 goto error;
1164 }
1165
1166 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
1167 old_dentry->d_name.name,
1168 new_dentry->d_name.name);
1169 if (ret < 0)
1170 goto rename_error;
1171 key_put(key);
1172 _leave(" = 0");
1173 return 0;
1174
1175 rename_error:
1176 key_put(key);
1177 error:
1178 d_drop(new_dentry);
1179 _leave(" = %d", ret);
1180 return ret;
1181 }