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x86_64, traps: Stop using IST for #SS
[linux-2.6/btrfs-unstable.git] / fs / afs / dir.c
bloba1645b88fe8a47d9a54fde42f1e5084932c96b94
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(void *_cookie, 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
43 const struct file_operations afs_dir_file_operations = {
44 .open = afs_dir_open,
45 .release = afs_release,
46 .iterate = afs_readdir,
47 .lock = afs_lock,
48 .llseek = generic_file_llseek,
49 };
50
51 const struct inode_operations afs_dir_inode_operations = {
52 .create = afs_create,
53 .lookup = afs_lookup,
54 .link = afs_link,
55 .unlink = afs_unlink,
56 .symlink = afs_symlink,
57 .mkdir = afs_mkdir,
58 .rmdir = afs_rmdir,
59 .rename = afs_rename,
60 .permission = afs_permission,
61 .getattr = afs_getattr,
62 .setattr = afs_setattr,
63 };
64
65 const struct dentry_operations afs_fs_dentry_operations = {
66 .d_revalidate = afs_d_revalidate,
67 .d_delete = afs_d_delete,
68 .d_release = afs_d_release,
69 .d_automount = afs_d_automount,
70 };
71
72 #define AFS_DIR_HASHTBL_SIZE 128
73 #define AFS_DIR_DIRENT_SIZE 32
74 #define AFS_DIRENT_PER_BLOCK 64
75
76 union afs_dirent {
77 struct {
78 uint8_t valid;
79 uint8_t unused[1];
80 __be16 hash_next;
81 __be32 vnode;
82 __be32 unique;
83 uint8_t name[16];
84 uint8_t overflow[4]; /* if any char of the name (inc
85 * NUL) reaches here, consume
86 * the next dirent too */
87 } u;
88 uint8_t extended_name[32];
89 };
90
91 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
92 struct afs_dir_pagehdr {
93 __be16 npages;
94 __be16 magic;
95 #define AFS_DIR_MAGIC htons(1234)
96 uint8_t nentries;
97 uint8_t bitmap[8];
98 uint8_t pad[19];
99 };
100
101 /* directory block layout */
102 union afs_dir_block {
103
104 struct afs_dir_pagehdr pagehdr;
105
106 struct {
107 struct afs_dir_pagehdr pagehdr;
108 uint8_t alloc_ctrs[128];
109 /* dir hash table */
110 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
111 } hdr;
112
113 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
114 };
115
116 /* layout on a linux VM page */
117 struct afs_dir_page {
118 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
119 };
120
121 struct afs_lookup_cookie {
122 struct dir_context ctx;
123 struct afs_fid fid;
124 struct qstr name;
125 int found;
126 };
127
128 /*
129 * check that a directory page is valid
130 */
131 static inline void afs_dir_check_page(struct inode *dir, struct page *page)
132 {
133 struct afs_dir_page *dbuf;
134 loff_t latter;
135 int tmp, qty;
136
137 #if 0
138 /* check the page count */
139 qty = desc.size / sizeof(dbuf->blocks[0]);
140 if (qty == 0)
141 goto error;
142
143 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
144 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
145 __func__, dir->i_ino, qty,
146 ntohs(dbuf->blocks[0].pagehdr.npages));
147 goto error;
148 }
149 #endif
150
151 /* determine how many magic numbers there should be in this page */
152 latter = dir->i_size - page_offset(page);
153 if (latter >= PAGE_SIZE)
154 qty = PAGE_SIZE;
155 else
156 qty = latter;
157 qty /= sizeof(union afs_dir_block);
158
159 /* check them */
160 dbuf = page_address(page);
161 for (tmp = 0; tmp < qty; tmp++) {
162 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
163 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
164 __func__, dir->i_ino, tmp, qty,
165 ntohs(dbuf->blocks[tmp].pagehdr.magic));
166 goto error;
167 }
168 }
169
170 SetPageChecked(page);
171 return;
172
173 error:
174 SetPageChecked(page);
175 SetPageError(page);
176 }
177
178 /*
179 * discard a page cached in the pagecache
180 */
181 static inline void afs_dir_put_page(struct page *page)
182 {
183 kunmap(page);
184 page_cache_release(page);
185 }
186
187 /*
188 * get a page into the pagecache
189 */
190 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
191 struct key *key)
192 {
193 struct page *page;
194 _enter("{%lu},%lu", dir->i_ino, index);
195
196 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
197 if (!IS_ERR(page)) {
198 kmap(page);
199 if (!PageChecked(page))
200 afs_dir_check_page(dir, page);
201 if (PageError(page))
202 goto fail;
203 }
204 return page;
205
206 fail:
207 afs_dir_put_page(page);
208 _leave(" = -EIO");
209 return ERR_PTR(-EIO);
210 }
211
212 /*
213 * open an AFS directory file
214 */
215 static int afs_dir_open(struct inode *inode, struct file *file)
216 {
217 _enter("{%lu}", inode->i_ino);
218
219 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
220 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
221
222 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
223 return -ENOENT;
224
225 return afs_open(inode, file);
226 }
227
228 /*
229 * deal with one block in an AFS directory
230 */
231 static int afs_dir_iterate_block(struct dir_context *ctx,
232 union afs_dir_block *block,
233 unsigned blkoff)
234 {
235 union afs_dirent *dire;
236 unsigned offset, next, curr;
237 size_t nlen;
238 int tmp;
239
240 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
241
242 curr = (ctx->pos - 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 ctx->pos = 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 if (!dir_emit(ctx, dire->u.name, nlen,
304 ntohl(dire->u.vnode),
305 ctx->actor == afs_lookup_filldir ?
306 ntohl(dire->u.unique) : DT_UNKNOWN)) {
307 _leave(" = 0 [full]");
308 return 0;
309 }
310
311 ctx->pos = blkoff + next * sizeof(union afs_dirent);
312 }
313
314 _leave(" = 1 [more]");
315 return 1;
316 }
317
318 /*
319 * iterate through the data blob that lists the contents of an AFS directory
320 */
321 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
322 struct key *key)
323 {
324 union afs_dir_block *dblock;
325 struct afs_dir_page *dbuf;
326 struct page *page;
327 unsigned blkoff, limit;
328 int ret;
329
330 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
331
332 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
333 _leave(" = -ESTALE");
334 return -ESTALE;
335 }
336
337 /* round the file position up to the next entry boundary */
338 ctx->pos += sizeof(union afs_dirent) - 1;
339 ctx->pos &= ~(sizeof(union afs_dirent) - 1);
340
341 /* walk through the blocks in sequence */
342 ret = 0;
343 while (ctx->pos < dir->i_size) {
344 blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1);
345
346 /* fetch the appropriate page from the directory */
347 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
348 if (IS_ERR(page)) {
349 ret = PTR_ERR(page);
350 break;
351 }
352
353 limit = blkoff & ~(PAGE_SIZE - 1);
354
355 dbuf = page_address(page);
356
357 /* deal with the individual blocks stashed on this page */
358 do {
359 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
360 sizeof(union afs_dir_block)];
361 ret = afs_dir_iterate_block(ctx, dblock, blkoff);
362 if (ret != 1) {
363 afs_dir_put_page(page);
364 goto out;
365 }
366
367 blkoff += sizeof(union afs_dir_block);
368
369 } while (ctx->pos < dir->i_size && blkoff < limit);
370
371 afs_dir_put_page(page);
372 ret = 0;
373 }
374
375 out:
376 _leave(" = %d", ret);
377 return ret;
378 }
379
380 /*
381 * read an AFS directory
382 */
383 static int afs_readdir(struct file *file, struct dir_context *ctx)
384 {
385 return afs_dir_iterate(file_inode(file),
386 ctx, file->private_data);
387 }
388
389 /*
390 * search the directory for a name
391 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
392 * uniquifier through dtype
393 */
394 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
395 loff_t fpos, u64 ino, unsigned dtype)
396 {
397 struct afs_lookup_cookie *cookie = _cookie;
398
399 _enter("{%s,%u},%s,%u,,%llu,%u",
400 cookie->name.name, cookie->name.len, name, nlen,
401 (unsigned long long) ino, dtype);
402
403 /* insanity checks first */
404 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
405 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
406
407 if (cookie->name.len != nlen ||
408 memcmp(cookie->name.name, name, nlen) != 0) {
409 _leave(" = 0 [no]");
410 return 0;
411 }
412
413 cookie->fid.vnode = ino;
414 cookie->fid.unique = dtype;
415 cookie->found = 1;
416
417 _leave(" = -1 [found]");
418 return -1;
419 }
420
421 /*
422 * do a lookup in a directory
423 * - just returns the FID the dentry name maps to if found
424 */
425 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
426 struct afs_fid *fid, struct key *key)
427 {
428 struct afs_super_info *as = dir->i_sb->s_fs_info;
429 struct afs_lookup_cookie cookie = {
430 .ctx.actor = afs_lookup_filldir,
431 .name = dentry->d_name,
432 .fid.vid = as->volume->vid
433 };
434 int ret;
435
436 _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
437
438 /* search the directory */
439 ret = afs_dir_iterate(dir, &cookie.ctx, key);
440 if (ret < 0) {
441 _leave(" = %d [iter]", ret);
442 return ret;
443 }
444
445 ret = -ENOENT;
446 if (!cookie.found) {
447 _leave(" = -ENOENT [not found]");
448 return -ENOENT;
449 }
450
451 *fid = cookie.fid;
452 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
453 return 0;
454 }
455
456 /*
457 * Try to auto mount the mountpoint with pseudo directory, if the autocell
458 * operation is setted.
459 */
460 static struct inode *afs_try_auto_mntpt(
461 int ret, struct dentry *dentry, struct inode *dir, struct key *key,
462 struct afs_fid *fid)
463 {
464 const char *devname = dentry->d_name.name;
465 struct afs_vnode *vnode = AFS_FS_I(dir);
466 struct inode *inode;
467
468 _enter("%d, %p{%s}, {%x:%u}, %p",
469 ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key);
470
471 if (ret != -ENOENT ||
472 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
473 goto out;
474
475 inode = afs_iget_autocell(dir, devname, strlen(devname), key);
476 if (IS_ERR(inode)) {
477 ret = PTR_ERR(inode);
478 goto out;
479 }
480
481 *fid = AFS_FS_I(inode)->fid;
482 _leave("= %p", inode);
483 return inode;
484
485 out:
486 _leave("= %d", ret);
487 return ERR_PTR(ret);
488 }
489
490 /*
491 * look up an entry in a directory
492 */
493 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
494 unsigned int flags)
495 {
496 struct afs_vnode *vnode;
497 struct afs_fid fid;
498 struct inode *inode;
499 struct key *key;
500 int ret;
501
502 vnode = AFS_FS_I(dir);
503
504 _enter("{%x:%u},%p{%s},",
505 vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
506
507 ASSERTCMP(dentry->d_inode, ==, NULL);
508
509 if (dentry->d_name.len >= AFSNAMEMAX) {
510 _leave(" = -ENAMETOOLONG");
511 return ERR_PTR(-ENAMETOOLONG);
512 }
513
514 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
515 _leave(" = -ESTALE");
516 return ERR_PTR(-ESTALE);
517 }
518
519 key = afs_request_key(vnode->volume->cell);
520 if (IS_ERR(key)) {
521 _leave(" = %ld [key]", PTR_ERR(key));
522 return ERR_CAST(key);
523 }
524
525 ret = afs_validate(vnode, key);
526 if (ret < 0) {
527 key_put(key);
528 _leave(" = %d [val]", ret);
529 return ERR_PTR(ret);
530 }
531
532 ret = afs_do_lookup(dir, dentry, &fid, key);
533 if (ret < 0) {
534 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
535 if (!IS_ERR(inode)) {
536 key_put(key);
537 goto success;
538 }
539
540 ret = PTR_ERR(inode);
541 key_put(key);
542 if (ret == -ENOENT) {
543 d_add(dentry, NULL);
544 _leave(" = NULL [negative]");
545 return NULL;
546 }
547 _leave(" = %d [do]", ret);
548 return ERR_PTR(ret);
549 }
550 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
551
552 /* instantiate the dentry */
553 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
554 key_put(key);
555 if (IS_ERR(inode)) {
556 _leave(" = %ld", PTR_ERR(inode));
557 return ERR_CAST(inode);
558 }
559
560 success:
561 d_add(dentry, inode);
562 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
563 fid.vnode,
564 fid.unique,
565 dentry->d_inode->i_ino,
566 dentry->d_inode->i_generation);
567
568 return NULL;
569 }
570
571 /*
572 * check that a dentry lookup hit has found a valid entry
573 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
574 * inode
575 */
576 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
577 {
578 struct afs_vnode *vnode, *dir;
579 struct afs_fid uninitialized_var(fid);
580 struct dentry *parent;
581 struct key *key;
582 void *dir_version;
583 int ret;
584
585 if (flags & LOOKUP_RCU)
586 return -ECHILD;
587
588 vnode = AFS_FS_I(dentry->d_inode);
589
590 if (dentry->d_inode)
591 _enter("{v={%x:%u} n=%s fl=%lx},",
592 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
593 vnode->flags);
594 else
595 _enter("{neg n=%s}", dentry->d_name.name);
596
597 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
598 if (IS_ERR(key))
599 key = NULL;
600
601 /* lock down the parent dentry so we can peer at it */
602 parent = dget_parent(dentry);
603 dir = AFS_FS_I(parent->d_inode);
604
605 /* validate the parent directory */
606 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
607 afs_validate(dir, key);
608
609 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
610 _debug("%s: parent dir deleted", dentry->d_name.name);
611 goto out_bad;
612 }
613
614 dir_version = (void *) (unsigned long) dir->status.data_version;
615 if (dentry->d_fsdata == dir_version)
616 goto out_valid; /* the dir contents are unchanged */
617
618 _debug("dir modified");
619
620 /* search the directory for this vnode */
621 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
622 switch (ret) {
623 case 0:
624 /* the filename maps to something */
625 if (!dentry->d_inode)
626 goto out_bad;
627 if (is_bad_inode(dentry->d_inode)) {
628 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
629 parent->d_name.name, dentry->d_name.name);
630 goto out_bad;
631 }
632
633 /* if the vnode ID has changed, then the dirent points to a
634 * different file */
635 if (fid.vnode != vnode->fid.vnode) {
636 _debug("%s: dirent changed [%u != %u]",
637 dentry->d_name.name, fid.vnode,
638 vnode->fid.vnode);
639 goto not_found;
640 }
641
642 /* if the vnode ID uniqifier has changed, then the file has
643 * been deleted and replaced, and the original vnode ID has
644 * been reused */
645 if (fid.unique != vnode->fid.unique) {
646 _debug("%s: file deleted (uq %u -> %u I:%u)",
647 dentry->d_name.name, fid.unique,
648 vnode->fid.unique,
649 dentry->d_inode->i_generation);
650 spin_lock(&vnode->lock);
651 set_bit(AFS_VNODE_DELETED, &vnode->flags);
652 spin_unlock(&vnode->lock);
653 goto not_found;
654 }
655 goto out_valid;
656
657 case -ENOENT:
658 /* the filename is unknown */
659 _debug("%s: dirent not found", dentry->d_name.name);
660 if (dentry->d_inode)
661 goto not_found;
662 goto out_valid;
663
664 default:
665 _debug("failed to iterate dir %s: %d",
666 parent->d_name.name, ret);
667 goto out_bad;
668 }
669
670 out_valid:
671 dentry->d_fsdata = dir_version;
672 dput(parent);
673 key_put(key);
674 _leave(" = 1 [valid]");
675 return 1;
676
677 /* the dirent, if it exists, now points to a different vnode */
678 not_found:
679 spin_lock(&dentry->d_lock);
680 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
681 spin_unlock(&dentry->d_lock);
682
683 out_bad:
684 _debug("dropping dentry %s/%s",
685 parent->d_name.name, dentry->d_name.name);
686 dput(parent);
687 key_put(key);
688
689 _leave(" = 0 [bad]");
690 return 0;
691 }
692
693 /*
694 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
695 * sleep)
696 * - called from dput() when d_count is going to 0.
697 * - return 1 to request dentry be unhashed, 0 otherwise
698 */
699 static int afs_d_delete(const struct dentry *dentry)
700 {
701 _enter("%s", dentry->d_name.name);
702
703 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
704 goto zap;
705
706 if (dentry->d_inode &&
707 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) ||
708 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags)))
709 goto zap;
710
711 _leave(" = 0 [keep]");
712 return 0;
713
714 zap:
715 _leave(" = 1 [zap]");
716 return 1;
717 }
718
719 /*
720 * handle dentry release
721 */
722 static void afs_d_release(struct dentry *dentry)
723 {
724 _enter("%s", dentry->d_name.name);
725 }
726
727 /*
728 * create a directory on an AFS filesystem
729 */
730 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
731 {
732 struct afs_file_status status;
733 struct afs_callback cb;
734 struct afs_server *server;
735 struct afs_vnode *dvnode, *vnode;
736 struct afs_fid fid;
737 struct inode *inode;
738 struct key *key;
739 int ret;
740
741 dvnode = AFS_FS_I(dir);
742
743 _enter("{%x:%u},{%s},%ho",
744 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
745
746 key = afs_request_key(dvnode->volume->cell);
747 if (IS_ERR(key)) {
748 ret = PTR_ERR(key);
749 goto error;
750 }
751
752 mode |= S_IFDIR;
753 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
754 mode, &fid, &status, &cb, &server);
755 if (ret < 0)
756 goto mkdir_error;
757
758 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
759 if (IS_ERR(inode)) {
760 /* ENOMEM at a really inconvenient time - just abandon the new
761 * directory on the server */
762 ret = PTR_ERR(inode);
763 goto iget_error;
764 }
765
766 /* apply the status report we've got for the new vnode */
767 vnode = AFS_FS_I(inode);
768 spin_lock(&vnode->lock);
769 vnode->update_cnt++;
770 spin_unlock(&vnode->lock);
771 afs_vnode_finalise_status_update(vnode, server);
772 afs_put_server(server);
773
774 d_instantiate(dentry, inode);
775 if (d_unhashed(dentry)) {
776 _debug("not hashed");
777 d_rehash(dentry);
778 }
779 key_put(key);
780 _leave(" = 0");
781 return 0;
782
783 iget_error:
784 afs_put_server(server);
785 mkdir_error:
786 key_put(key);
787 error:
788 d_drop(dentry);
789 _leave(" = %d", ret);
790 return ret;
791 }
792
793 /*
794 * remove a directory from an AFS filesystem
795 */
796 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
797 {
798 struct afs_vnode *dvnode, *vnode;
799 struct key *key;
800 int ret;
801
802 dvnode = AFS_FS_I(dir);
803
804 _enter("{%x:%u},{%s}",
805 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
806
807 key = afs_request_key(dvnode->volume->cell);
808 if (IS_ERR(key)) {
809 ret = PTR_ERR(key);
810 goto error;
811 }
812
813 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
814 if (ret < 0)
815 goto rmdir_error;
816
817 if (dentry->d_inode) {
818 vnode = AFS_FS_I(dentry->d_inode);
819 clear_nlink(&vnode->vfs_inode);
820 set_bit(AFS_VNODE_DELETED, &vnode->flags);
821 afs_discard_callback_on_delete(vnode);
822 }
823
824 key_put(key);
825 _leave(" = 0");
826 return 0;
827
828 rmdir_error:
829 key_put(key);
830 error:
831 _leave(" = %d", ret);
832 return ret;
833 }
834
835 /*
836 * remove a file from an AFS filesystem
837 */
838 static int afs_unlink(struct inode *dir, struct dentry *dentry)
839 {
840 struct afs_vnode *dvnode, *vnode;
841 struct key *key;
842 int ret;
843
844 dvnode = AFS_FS_I(dir);
845
846 _enter("{%x:%u},{%s}",
847 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
848
849 ret = -ENAMETOOLONG;
850 if (dentry->d_name.len >= AFSNAMEMAX)
851 goto error;
852
853 key = afs_request_key(dvnode->volume->cell);
854 if (IS_ERR(key)) {
855 ret = PTR_ERR(key);
856 goto error;
857 }
858
859 if (dentry->d_inode) {
860 vnode = AFS_FS_I(dentry->d_inode);
861
862 /* make sure we have a callback promise on the victim */
863 ret = afs_validate(vnode, key);
864 if (ret < 0)
865 goto error;
866 }
867
868 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
869 if (ret < 0)
870 goto remove_error;
871
872 if (dentry->d_inode) {
873 /* if the file wasn't deleted due to excess hard links, the
874 * fileserver will break the callback promise on the file - if
875 * it had one - before it returns to us, and if it was deleted,
876 * it won't
877 *
878 * however, if we didn't have a callback promise outstanding,
879 * or it was outstanding on a different server, then it won't
880 * break it either...
881 */
882 vnode = AFS_FS_I(dentry->d_inode);
883 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
884 _debug("AFS_VNODE_DELETED");
885 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
886 _debug("AFS_VNODE_CB_BROKEN");
887 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
888 ret = afs_validate(vnode, key);
889 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
890 }
891
892 key_put(key);
893 _leave(" = 0");
894 return 0;
895
896 remove_error:
897 key_put(key);
898 error:
899 _leave(" = %d", ret);
900 return ret;
901 }
902
903 /*
904 * create a regular file on an AFS filesystem
905 */
906 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
907 bool excl)
908 {
909 struct afs_file_status status;
910 struct afs_callback cb;
911 struct afs_server *server;
912 struct afs_vnode *dvnode, *vnode;
913 struct afs_fid fid;
914 struct inode *inode;
915 struct key *key;
916 int ret;
917
918 dvnode = AFS_FS_I(dir);
919
920 _enter("{%x:%u},{%s},%ho,",
921 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
922
923 key = afs_request_key(dvnode->volume->cell);
924 if (IS_ERR(key)) {
925 ret = PTR_ERR(key);
926 goto error;
927 }
928
929 mode |= S_IFREG;
930 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
931 mode, &fid, &status, &cb, &server);
932 if (ret < 0)
933 goto create_error;
934
935 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
936 if (IS_ERR(inode)) {
937 /* ENOMEM at a really inconvenient time - just abandon the new
938 * directory on the server */
939 ret = PTR_ERR(inode);
940 goto iget_error;
941 }
942
943 /* apply the status report we've got for the new vnode */
944 vnode = AFS_FS_I(inode);
945 spin_lock(&vnode->lock);
946 vnode->update_cnt++;
947 spin_unlock(&vnode->lock);
948 afs_vnode_finalise_status_update(vnode, server);
949 afs_put_server(server);
950
951 d_instantiate(dentry, inode);
952 if (d_unhashed(dentry)) {
953 _debug("not hashed");
954 d_rehash(dentry);
955 }
956 key_put(key);
957 _leave(" = 0");
958 return 0;
959
960 iget_error:
961 afs_put_server(server);
962 create_error:
963 key_put(key);
964 error:
965 d_drop(dentry);
966 _leave(" = %d", ret);
967 return ret;
968 }
969
970 /*
971 * create a hard link between files in an AFS filesystem
972 */
973 static int afs_link(struct dentry *from, struct inode *dir,
974 struct dentry *dentry)
975 {
976 struct afs_vnode *dvnode, *vnode;
977 struct key *key;
978 int ret;
979
980 vnode = AFS_FS_I(from->d_inode);
981 dvnode = AFS_FS_I(dir);
982
983 _enter("{%x:%u},{%x:%u},{%s}",
984 vnode->fid.vid, vnode->fid.vnode,
985 dvnode->fid.vid, dvnode->fid.vnode,
986 dentry->d_name.name);
987
988 key = afs_request_key(dvnode->volume->cell);
989 if (IS_ERR(key)) {
990 ret = PTR_ERR(key);
991 goto error;
992 }
993
994 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
995 if (ret < 0)
996 goto link_error;
997
998 ihold(&vnode->vfs_inode);
999 d_instantiate(dentry, &vnode->vfs_inode);
1000 key_put(key);
1001 _leave(" = 0");
1002 return 0;
1003
1004 link_error:
1005 key_put(key);
1006 error:
1007 d_drop(dentry);
1008 _leave(" = %d", ret);
1009 return ret;
1010 }
1011
1012 /*
1013 * create a symlink in an AFS filesystem
1014 */
1015 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1016 const char *content)
1017 {
1018 struct afs_file_status status;
1019 struct afs_server *server;
1020 struct afs_vnode *dvnode, *vnode;
1021 struct afs_fid fid;
1022 struct inode *inode;
1023 struct key *key;
1024 int ret;
1025
1026 dvnode = AFS_FS_I(dir);
1027
1028 _enter("{%x:%u},{%s},%s",
1029 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
1030 content);
1031
1032 ret = -EINVAL;
1033 if (strlen(content) >= AFSPATHMAX)
1034 goto error;
1035
1036 key = afs_request_key(dvnode->volume->cell);
1037 if (IS_ERR(key)) {
1038 ret = PTR_ERR(key);
1039 goto error;
1040 }
1041
1042 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
1043 &fid, &status, &server);
1044 if (ret < 0)
1045 goto create_error;
1046
1047 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
1048 if (IS_ERR(inode)) {
1049 /* ENOMEM at a really inconvenient time - just abandon the new
1050 * directory on the server */
1051 ret = PTR_ERR(inode);
1052 goto iget_error;
1053 }
1054
1055 /* apply the status report we've got for the new vnode */
1056 vnode = AFS_FS_I(inode);
1057 spin_lock(&vnode->lock);
1058 vnode->update_cnt++;
1059 spin_unlock(&vnode->lock);
1060 afs_vnode_finalise_status_update(vnode, server);
1061 afs_put_server(server);
1062
1063 d_instantiate(dentry, inode);
1064 if (d_unhashed(dentry)) {
1065 _debug("not hashed");
1066 d_rehash(dentry);
1067 }
1068 key_put(key);
1069 _leave(" = 0");
1070 return 0;
1071
1072 iget_error:
1073 afs_put_server(server);
1074 create_error:
1075 key_put(key);
1076 error:
1077 d_drop(dentry);
1078 _leave(" = %d", ret);
1079 return ret;
1080 }
1081
1082 /*
1083 * rename a file in an AFS filesystem and/or move it between directories
1084 */
1085 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1086 struct inode *new_dir, struct dentry *new_dentry)
1087 {
1088 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1089 struct key *key;
1090 int ret;
1091
1092 vnode = AFS_FS_I(old_dentry->d_inode);
1093 orig_dvnode = AFS_FS_I(old_dir);
1094 new_dvnode = AFS_FS_I(new_dir);
1095
1096 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
1097 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1098 vnode->fid.vid, vnode->fid.vnode,
1099 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1100 new_dentry->d_name.name);
1101
1102 key = afs_request_key(orig_dvnode->volume->cell);
1103 if (IS_ERR(key)) {
1104 ret = PTR_ERR(key);
1105 goto error;
1106 }
1107
1108 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
1109 old_dentry->d_name.name,
1110 new_dentry->d_name.name);
1111 if (ret < 0)
1112 goto rename_error;
1113 key_put(key);
1114 _leave(" = 0");
1115 return 0;
1116
1117 rename_error:
1118 key_put(key);
1119 error:
1120 d_drop(new_dentry);
1121 _leave(" = %d", ret);
1122 return ret;
1123 }
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