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net: phy: marvell: avoid pause mode on SGMII-to-Copper for 88e151x
[linux-2.6/btrfs-unstable.git] / fs / afs / dir.c
blobff8d5bf4354f306227a297ca542078580ca57e34
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 bool afs_dir_check_page(struct inode *dir, struct page *page)
134 {
135 struct afs_dir_page *dbuf;
136 struct afs_vnode *vnode = AFS_FS_I(dir);
137 loff_t latter, i_size, off;
138 int tmp, qty;
139
140 #if 0
141 /* check the page count */
142 qty = desc.size / sizeof(dbuf->blocks[0]);
143 if (qty == 0)
144 goto error;
145
146 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
147 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
148 __func__, dir->i_ino, qty,
149 ntohs(dbuf->blocks[0].pagehdr.npages));
150 goto error;
151 }
152 #endif
153
154 /* Determine how many magic numbers there should be in this page, but
155 * we must take care because the directory may change size under us.
156 */
157 off = page_offset(page);
158 i_size = i_size_read(dir);
159 if (i_size <= off)
160 goto checked;
161
162 latter = i_size - off;
163 if (latter >= PAGE_SIZE)
164 qty = PAGE_SIZE;
165 else
166 qty = latter;
167 qty /= sizeof(union afs_dir_block);
168
169 /* check them */
170 dbuf = page_address(page);
171 for (tmp = 0; tmp < qty; tmp++) {
172 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
173 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
174 __func__, dir->i_ino, tmp, qty,
175 ntohs(dbuf->blocks[tmp].pagehdr.magic));
176 trace_afs_dir_check_failed(vnode, off, i_size);
177 goto error;
178 }
179 }
180
181 checked:
182 SetPageChecked(page);
183 return true;
184
185 error:
186 SetPageError(page);
187 return false;
188 }
189
190 /*
191 * discard a page cached in the pagecache
192 */
193 static inline void afs_dir_put_page(struct page *page)
194 {
195 kunmap(page);
196 unlock_page(page);
197 put_page(page);
198 }
199
200 /*
201 * get a page into the pagecache
202 */
203 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
204 struct key *key)
205 {
206 struct page *page;
207 _enter("{%lu},%lu", dir->i_ino, index);
208
209 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
210 if (!IS_ERR(page)) {
211 lock_page(page);
212 kmap(page);
213 if (unlikely(!PageChecked(page))) {
214 if (PageError(page))
215 goto fail;
216 }
217 }
218 return page;
219
220 fail:
221 afs_dir_put_page(page);
222 _leave(" = -EIO");
223 return ERR_PTR(-EIO);
224 }
225
226 /*
227 * open an AFS directory file
228 */
229 static int afs_dir_open(struct inode *inode, struct file *file)
230 {
231 _enter("{%lu}", inode->i_ino);
232
233 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
234 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
235
236 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
237 return -ENOENT;
238
239 return afs_open(inode, file);
240 }
241
242 /*
243 * deal with one block in an AFS directory
244 */
245 static int afs_dir_iterate_block(struct dir_context *ctx,
246 union afs_dir_block *block,
247 unsigned blkoff)
248 {
249 union afs_dirent *dire;
250 unsigned offset, next, curr;
251 size_t nlen;
252 int tmp;
253
254 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
255
256 curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
257
258 /* walk through the block, an entry at a time */
259 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
260 offset < AFS_DIRENT_PER_BLOCK;
261 offset = next
262 ) {
263 next = offset + 1;
264
265 /* skip entries marked unused in the bitmap */
266 if (!(block->pagehdr.bitmap[offset / 8] &
267 (1 << (offset % 8)))) {
268 _debug("ENT[%zu.%u]: unused",
269 blkoff / sizeof(union afs_dir_block), offset);
270 if (offset >= curr)
271 ctx->pos = blkoff +
272 next * sizeof(union afs_dirent);
273 continue;
274 }
275
276 /* got a valid entry */
277 dire = &block->dirents[offset];
278 nlen = strnlen(dire->u.name,
279 sizeof(*block) -
280 offset * sizeof(union afs_dirent));
281
282 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
283 blkoff / sizeof(union afs_dir_block), offset,
284 (offset < curr ? "skip" : "fill"),
285 nlen, dire->u.name);
286
287 /* work out where the next possible entry is */
288 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
289 if (next >= AFS_DIRENT_PER_BLOCK) {
290 _debug("ENT[%zu.%u]:"
291 " %u travelled beyond end dir block"
292 " (len %u/%zu)",
293 blkoff / sizeof(union afs_dir_block),
294 offset, next, tmp, nlen);
295 return -EIO;
296 }
297 if (!(block->pagehdr.bitmap[next / 8] &
298 (1 << (next % 8)))) {
299 _debug("ENT[%zu.%u]:"
300 " %u unmarked extension (len %u/%zu)",
301 blkoff / sizeof(union afs_dir_block),
302 offset, next, tmp, nlen);
303 return -EIO;
304 }
305
306 _debug("ENT[%zu.%u]: ext %u/%zu",
307 blkoff / sizeof(union afs_dir_block),
308 next, tmp, nlen);
309 next++;
310 }
311
312 /* skip if starts before the current position */
313 if (offset < curr)
314 continue;
315
316 /* found the next entry */
317 if (!dir_emit(ctx, dire->u.name, nlen,
318 ntohl(dire->u.vnode),
319 ctx->actor == afs_lookup_filldir ?
320 ntohl(dire->u.unique) : DT_UNKNOWN)) {
321 _leave(" = 0 [full]");
322 return 0;
323 }
324
325 ctx->pos = blkoff + next * sizeof(union afs_dirent);
326 }
327
328 _leave(" = 1 [more]");
329 return 1;
330 }
331
332 /*
333 * iterate through the data blob that lists the contents of an AFS directory
334 */
335 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
336 struct key *key)
337 {
338 union afs_dir_block *dblock;
339 struct afs_dir_page *dbuf;
340 struct page *page;
341 unsigned blkoff, limit;
342 int ret;
343
344 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
345
346 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
347 _leave(" = -ESTALE");
348 return -ESTALE;
349 }
350
351 /* round the file position up to the next entry boundary */
352 ctx->pos += sizeof(union afs_dirent) - 1;
353 ctx->pos &= ~(sizeof(union afs_dirent) - 1);
354
355 /* walk through the blocks in sequence */
356 ret = 0;
357 while (ctx->pos < dir->i_size) {
358 blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1);
359
360 /* fetch the appropriate page from the directory */
361 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
362 if (IS_ERR(page)) {
363 ret = PTR_ERR(page);
364 break;
365 }
366
367 limit = blkoff & ~(PAGE_SIZE - 1);
368
369 dbuf = page_address(page);
370
371 /* deal with the individual blocks stashed on this page */
372 do {
373 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
374 sizeof(union afs_dir_block)];
375 ret = afs_dir_iterate_block(ctx, dblock, blkoff);
376 if (ret != 1) {
377 afs_dir_put_page(page);
378 goto out;
379 }
380
381 blkoff += sizeof(union afs_dir_block);
382
383 } while (ctx->pos < dir->i_size && blkoff < limit);
384
385 afs_dir_put_page(page);
386 ret = 0;
387 }
388
389 out:
390 _leave(" = %d", ret);
391 return ret;
392 }
393
394 /*
395 * read an AFS directory
396 */
397 static int afs_readdir(struct file *file, struct dir_context *ctx)
398 {
399 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file));
400 }
401
402 /*
403 * search the directory for a name
404 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
405 * uniquifier through dtype
406 */
407 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
408 int nlen, loff_t fpos, u64 ino, unsigned dtype)
409 {
410 struct afs_lookup_cookie *cookie =
411 container_of(ctx, struct afs_lookup_cookie, ctx);
412
413 _enter("{%s,%u},%s,%u,,%llu,%u",
414 cookie->name.name, cookie->name.len, name, nlen,
415 (unsigned long long) ino, dtype);
416
417 /* insanity checks first */
418 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
419 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
420
421 if (cookie->name.len != nlen ||
422 memcmp(cookie->name.name, name, nlen) != 0) {
423 _leave(" = 0 [no]");
424 return 0;
425 }
426
427 cookie->fid.vnode = ino;
428 cookie->fid.unique = dtype;
429 cookie->found = 1;
430
431 _leave(" = -1 [found]");
432 return -1;
433 }
434
435 /*
436 * do a lookup in a directory
437 * - just returns the FID the dentry name maps to if found
438 */
439 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
440 struct afs_fid *fid, struct key *key)
441 {
442 struct afs_super_info *as = dir->i_sb->s_fs_info;
443 struct afs_lookup_cookie cookie = {
444 .ctx.actor = afs_lookup_filldir,
445 .name = dentry->d_name,
446 .fid.vid = as->volume->vid
447 };
448 int ret;
449
450 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
451
452 /* search the directory */
453 ret = afs_dir_iterate(dir, &cookie.ctx, key);
454 if (ret < 0) {
455 _leave(" = %d [iter]", ret);
456 return ret;
457 }
458
459 ret = -ENOENT;
460 if (!cookie.found) {
461 _leave(" = -ENOENT [not found]");
462 return -ENOENT;
463 }
464
465 *fid = cookie.fid;
466 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
467 return 0;
468 }
469
470 /*
471 * Try to auto mount the mountpoint with pseudo directory, if the autocell
472 * operation is setted.
473 */
474 static struct inode *afs_try_auto_mntpt(
475 int ret, struct dentry *dentry, struct inode *dir, struct key *key,
476 struct afs_fid *fid)
477 {
478 const char *devname = dentry->d_name.name;
479 struct afs_vnode *vnode = AFS_FS_I(dir);
480 struct inode *inode;
481
482 _enter("%d, %p{%pd}, {%x:%u}, %p",
483 ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key);
484
485 if (ret != -ENOENT ||
486 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
487 goto out;
488
489 inode = afs_iget_autocell(dir, devname, strlen(devname), key);
490 if (IS_ERR(inode)) {
491 ret = PTR_ERR(inode);
492 goto out;
493 }
494
495 *fid = AFS_FS_I(inode)->fid;
496 _leave("= %p", inode);
497 return inode;
498
499 out:
500 _leave("= %d", ret);
501 return ERR_PTR(ret);
502 }
503
504 /*
505 * look up an entry in a directory
506 */
507 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
508 unsigned int flags)
509 {
510 struct afs_vnode *vnode;
511 struct afs_fid fid;
512 struct inode *inode;
513 struct key *key;
514 int ret;
515
516 vnode = AFS_FS_I(dir);
517
518 _enter("{%x:%u},%p{%pd},",
519 vnode->fid.vid, vnode->fid.vnode, dentry, dentry);
520
521 ASSERTCMP(d_inode(dentry), ==, NULL);
522
523 if (dentry->d_name.len >= AFSNAMEMAX) {
524 _leave(" = -ENAMETOOLONG");
525 return ERR_PTR(-ENAMETOOLONG);
526 }
527
528 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
529 _leave(" = -ESTALE");
530 return ERR_PTR(-ESTALE);
531 }
532
533 key = afs_request_key(vnode->volume->cell);
534 if (IS_ERR(key)) {
535 _leave(" = %ld [key]", PTR_ERR(key));
536 return ERR_CAST(key);
537 }
538
539 ret = afs_validate(vnode, key);
540 if (ret < 0) {
541 key_put(key);
542 _leave(" = %d [val]", ret);
543 return ERR_PTR(ret);
544 }
545
546 ret = afs_do_lookup(dir, dentry, &fid, key);
547 if (ret < 0) {
548 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
549 if (!IS_ERR(inode)) {
550 key_put(key);
551 goto success;
552 }
553
554 ret = PTR_ERR(inode);
555 key_put(key);
556 if (ret == -ENOENT) {
557 d_add(dentry, NULL);
558 _leave(" = NULL [negative]");
559 return NULL;
560 }
561 _leave(" = %d [do]", ret);
562 return ERR_PTR(ret);
563 }
564 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
565
566 /* instantiate the dentry */
567 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL);
568 key_put(key);
569 if (IS_ERR(inode)) {
570 _leave(" = %ld", PTR_ERR(inode));
571 return ERR_CAST(inode);
572 }
573
574 success:
575 d_add(dentry, inode);
576 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
577 fid.vnode,
578 fid.unique,
579 d_inode(dentry)->i_ino,
580 d_inode(dentry)->i_generation);
581
582 return NULL;
583 }
584
585 /*
586 * check that a dentry lookup hit has found a valid entry
587 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
588 * inode
589 */
590 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
591 {
592 struct afs_vnode *vnode, *dir;
593 struct afs_fid uninitialized_var(fid);
594 struct dentry *parent;
595 struct inode *inode;
596 struct key *key;
597 void *dir_version;
598 int ret;
599
600 if (flags & LOOKUP_RCU)
601 return -ECHILD;
602
603 if (d_really_is_positive(dentry)) {
604 vnode = AFS_FS_I(d_inode(dentry));
605 _enter("{v={%x:%u} n=%pd fl=%lx},",
606 vnode->fid.vid, vnode->fid.vnode, dentry,
607 vnode->flags);
608 } else {
609 _enter("{neg n=%pd}", dentry);
610 }
611
612 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
613 if (IS_ERR(key))
614 key = NULL;
615
616 if (d_really_is_positive(dentry)) {
617 inode = d_inode(dentry);
618 if (inode) {
619 vnode = AFS_FS_I(inode);
620 afs_validate(vnode, key);
621 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
622 goto out_bad;
623 }
624 }
625
626 /* lock down the parent dentry so we can peer at it */
627 parent = dget_parent(dentry);
628 dir = AFS_FS_I(d_inode(parent));
629
630 /* validate the parent directory */
631 afs_validate(dir, key);
632
633 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
634 _debug("%pd: parent dir deleted", dentry);
635 goto out_bad_parent;
636 }
637
638 dir_version = (void *) (unsigned long) dir->status.data_version;
639 if (dentry->d_fsdata == dir_version)
640 goto out_valid; /* the dir contents are unchanged */
641
642 _debug("dir modified");
643
644 /* search the directory for this vnode */
645 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
646 switch (ret) {
647 case 0:
648 /* the filename maps to something */
649 if (d_really_is_negative(dentry))
650 goto out_bad_parent;
651 inode = d_inode(dentry);
652 if (is_bad_inode(inode)) {
653 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
654 dentry);
655 goto out_bad_parent;
656 }
657
658 vnode = AFS_FS_I(inode);
659
660 /* if the vnode ID has changed, then the dirent points to a
661 * different file */
662 if (fid.vnode != vnode->fid.vnode) {
663 _debug("%pd: dirent changed [%u != %u]",
664 dentry, fid.vnode,
665 vnode->fid.vnode);
666 goto not_found;
667 }
668
669 /* if the vnode ID uniqifier has changed, then the file has
670 * been deleted and replaced, and the original vnode ID has
671 * been reused */
672 if (fid.unique != vnode->fid.unique) {
673 _debug("%pd: file deleted (uq %u -> %u I:%u)",
674 dentry, fid.unique,
675 vnode->fid.unique,
676 vnode->vfs_inode.i_generation);
677 write_seqlock(&vnode->cb_lock);
678 set_bit(AFS_VNODE_DELETED, &vnode->flags);
679 write_sequnlock(&vnode->cb_lock);
680 goto not_found;
681 }
682 goto out_valid;
683
684 case -ENOENT:
685 /* the filename is unknown */
686 _debug("%pd: dirent not found", dentry);
687 if (d_really_is_positive(dentry))
688 goto not_found;
689 goto out_valid;
690
691 default:
692 _debug("failed to iterate dir %pd: %d",
693 parent, ret);
694 goto out_bad_parent;
695 }
696
697 out_valid:
698 dentry->d_fsdata = dir_version;
699 dput(parent);
700 key_put(key);
701 _leave(" = 1 [valid]");
702 return 1;
703
704 /* the dirent, if it exists, now points to a different vnode */
705 not_found:
706 spin_lock(&dentry->d_lock);
707 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
708 spin_unlock(&dentry->d_lock);
709
710 out_bad_parent:
711 _debug("dropping dentry %pd2", dentry);
712 dput(parent);
713 out_bad:
714 key_put(key);
715
716 _leave(" = 0 [bad]");
717 return 0;
718 }
719
720 /*
721 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
722 * sleep)
723 * - called from dput() when d_count is going to 0.
724 * - return 1 to request dentry be unhashed, 0 otherwise
725 */
726 static int afs_d_delete(const struct dentry *dentry)
727 {
728 _enter("%pd", dentry);
729
730 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
731 goto zap;
732
733 if (d_really_is_positive(dentry) &&
734 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
735 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
736 goto zap;
737
738 _leave(" = 0 [keep]");
739 return 0;
740
741 zap:
742 _leave(" = 1 [zap]");
743 return 1;
744 }
745
746 /*
747 * handle dentry release
748 */
749 static void afs_d_release(struct dentry *dentry)
750 {
751 _enter("%pd", dentry);
752 }
753
754 /*
755 * Create a new inode for create/mkdir/symlink
756 */
757 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
758 struct dentry *new_dentry,
759 struct afs_fid *newfid,
760 struct afs_file_status *newstatus,
761 struct afs_callback *newcb)
762 {
763 struct inode *inode;
764
765 if (fc->ac.error < 0)
766 return;
767
768 d_drop(new_dentry);
769
770 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
771 newfid, newstatus, newcb, fc->cbi);
772 if (IS_ERR(inode)) {
773 /* ENOMEM or EINTR at a really inconvenient time - just abandon
774 * the new directory on the server.
775 */
776 fc->ac.error = PTR_ERR(inode);
777 return;
778 }
779
780 d_add(new_dentry, inode);
781 }
782
783 /*
784 * create a directory on an AFS filesystem
785 */
786 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
787 {
788 struct afs_file_status newstatus;
789 struct afs_fs_cursor fc;
790 struct afs_callback newcb;
791 struct afs_vnode *dvnode = AFS_FS_I(dir);
792 struct afs_fid newfid;
793 struct key *key;
794 int ret;
795
796 mode |= S_IFDIR;
797
798 _enter("{%x:%u},{%pd},%ho",
799 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
800
801 key = afs_request_key(dvnode->volume->cell);
802 if (IS_ERR(key)) {
803 ret = PTR_ERR(key);
804 goto error;
805 }
806
807 ret = -ERESTARTSYS;
808 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
809 while (afs_select_fileserver(&fc)) {
810 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
811 afs_fs_create(&fc, dentry->d_name.name, mode,
812 &newfid, &newstatus, &newcb);
813 }
814
815 afs_check_for_remote_deletion(&fc, fc.vnode);
816 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
817 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
818 ret = afs_end_vnode_operation(&fc);
819 if (ret < 0)
820 goto error_key;
821 } else {
822 goto error_key;
823 }
824
825 key_put(key);
826 _leave(" = 0");
827 return 0;
828
829 error_key:
830 key_put(key);
831 error:
832 d_drop(dentry);
833 _leave(" = %d", ret);
834 return ret;
835 }
836
837 /*
838 * Remove a subdir from a directory.
839 */
840 static void afs_dir_remove_subdir(struct dentry *dentry)
841 {
842 if (d_really_is_positive(dentry)) {
843 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
844
845 clear_nlink(&vnode->vfs_inode);
846 set_bit(AFS_VNODE_DELETED, &vnode->flags);
847 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
848 }
849 }
850
851 /*
852 * remove a directory from an AFS filesystem
853 */
854 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
855 {
856 struct afs_fs_cursor fc;
857 struct afs_vnode *dvnode = AFS_FS_I(dir);
858 struct key *key;
859 int ret;
860
861 _enter("{%x:%u},{%pd}",
862 dvnode->fid.vid, dvnode->fid.vnode, dentry);
863
864 key = afs_request_key(dvnode->volume->cell);
865 if (IS_ERR(key)) {
866 ret = PTR_ERR(key);
867 goto error;
868 }
869
870 ret = -ERESTARTSYS;
871 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
872 while (afs_select_fileserver(&fc)) {
873 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
874 afs_fs_remove(&fc, dentry->d_name.name, true);
875 }
876
877 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
878 ret = afs_end_vnode_operation(&fc);
879 if (ret == 0)
880 afs_dir_remove_subdir(dentry);
881 }
882
883 key_put(key);
884 error:
885 return ret;
886 }
887
888 /*
889 * Remove a link to a file or symlink from a directory.
890 *
891 * If the file was not deleted due to excess hard links, the fileserver will
892 * break the callback promise on the file - if it had one - before it returns
893 * to us, and if it was deleted, it won't
894 *
895 * However, if we didn't have a callback promise outstanding, or it was
896 * outstanding on a different server, then it won't break it either...
897 */
898 static int afs_dir_remove_link(struct dentry *dentry, struct key *key)
899 {
900 int ret = 0;
901
902 if (d_really_is_positive(dentry)) {
903 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
904
905 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
906 kdebug("AFS_VNODE_DELETED");
907 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
908
909 ret = afs_validate(vnode, key);
910 if (ret == -ESTALE)
911 ret = 0;
912 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
913 }
914
915 return ret;
916 }
917
918 /*
919 * Remove a file or symlink from an AFS filesystem.
920 */
921 static int afs_unlink(struct inode *dir, struct dentry *dentry)
922 {
923 struct afs_fs_cursor fc;
924 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
925 struct key *key;
926 int ret;
927
928 _enter("{%x:%u},{%pd}",
929 dvnode->fid.vid, dvnode->fid.vnode, dentry);
930
931 if (dentry->d_name.len >= AFSNAMEMAX)
932 return -ENAMETOOLONG;
933
934 key = afs_request_key(dvnode->volume->cell);
935 if (IS_ERR(key)) {
936 ret = PTR_ERR(key);
937 goto error;
938 }
939
940 /* Try to make sure we have a callback promise on the victim. */
941 if (d_really_is_positive(dentry)) {
942 vnode = AFS_FS_I(d_inode(dentry));
943 ret = afs_validate(vnode, key);
944 if (ret < 0)
945 goto error_key;
946 }
947
948 ret = -ERESTARTSYS;
949 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
950 while (afs_select_fileserver(&fc)) {
951 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
952 afs_fs_remove(&fc, dentry->d_name.name, false);
953 }
954
955 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
956 ret = afs_end_vnode_operation(&fc);
957 if (ret == 0)
958 ret = afs_dir_remove_link(dentry, key);
959 }
960
961 error_key:
962 key_put(key);
963 error:
964 _leave(" = %d", ret);
965 return ret;
966 }
967
968 /*
969 * create a regular file on an AFS filesystem
970 */
971 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
972 bool excl)
973 {
974 struct afs_fs_cursor fc;
975 struct afs_file_status newstatus;
976 struct afs_callback newcb;
977 struct afs_vnode *dvnode = AFS_FS_I(dir);
978 struct afs_fid newfid;
979 struct key *key;
980 int ret;
981
982 mode |= S_IFREG;
983
984 _enter("{%x:%u},{%pd},%ho,",
985 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
986
987 ret = -ENAMETOOLONG;
988 if (dentry->d_name.len >= AFSNAMEMAX)
989 goto error;
990
991 key = afs_request_key(dvnode->volume->cell);
992 if (IS_ERR(key)) {
993 ret = PTR_ERR(key);
994 goto error;
995 }
996
997 ret = -ERESTARTSYS;
998 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
999 while (afs_select_fileserver(&fc)) {
1000 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1001 afs_fs_create(&fc, dentry->d_name.name, mode,
1002 &newfid, &newstatus, &newcb);
1003 }
1004
1005 afs_check_for_remote_deletion(&fc, fc.vnode);
1006 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1007 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
1008 ret = afs_end_vnode_operation(&fc);
1009 if (ret < 0)
1010 goto error_key;
1011 } else {
1012 goto error_key;
1013 }
1014
1015 key_put(key);
1016 _leave(" = 0");
1017 return 0;
1018
1019 error_key:
1020 key_put(key);
1021 error:
1022 d_drop(dentry);
1023 _leave(" = %d", ret);
1024 return ret;
1025 }
1026
1027 /*
1028 * create a hard link between files in an AFS filesystem
1029 */
1030 static int afs_link(struct dentry *from, struct inode *dir,
1031 struct dentry *dentry)
1032 {
1033 struct afs_fs_cursor fc;
1034 struct afs_vnode *dvnode, *vnode;
1035 struct key *key;
1036 int ret;
1037
1038 vnode = AFS_FS_I(d_inode(from));
1039 dvnode = AFS_FS_I(dir);
1040
1041 _enter("{%x:%u},{%x:%u},{%pd}",
1042 vnode->fid.vid, vnode->fid.vnode,
1043 dvnode->fid.vid, dvnode->fid.vnode,
1044 dentry);
1045
1046 ret = -ENAMETOOLONG;
1047 if (dentry->d_name.len >= AFSNAMEMAX)
1048 goto error;
1049
1050 key = afs_request_key(dvnode->volume->cell);
1051 if (IS_ERR(key)) {
1052 ret = PTR_ERR(key);
1053 goto error;
1054 }
1055
1056 ret = -ERESTARTSYS;
1057 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1058 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1059 afs_end_vnode_operation(&fc);
1060 goto error_key;
1061 }
1062
1063 while (afs_select_fileserver(&fc)) {
1064 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1065 fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break;
1066 afs_fs_link(&fc, vnode, dentry->d_name.name);
1067 }
1068
1069 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1070 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
1071 ihold(&vnode->vfs_inode);
1072 d_instantiate(dentry, &vnode->vfs_inode);
1073
1074 mutex_unlock(&vnode->io_lock);
1075 ret = afs_end_vnode_operation(&fc);
1076 if (ret < 0)
1077 goto error_key;
1078 } else {
1079 goto error_key;
1080 }
1081
1082 key_put(key);
1083 _leave(" = 0");
1084 return 0;
1085
1086 error_key:
1087 key_put(key);
1088 error:
1089 d_drop(dentry);
1090 _leave(" = %d", ret);
1091 return ret;
1092 }
1093
1094 /*
1095 * create a symlink in an AFS filesystem
1096 */
1097 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1098 const char *content)
1099 {
1100 struct afs_fs_cursor fc;
1101 struct afs_file_status newstatus;
1102 struct afs_vnode *dvnode = AFS_FS_I(dir);
1103 struct afs_fid newfid;
1104 struct key *key;
1105 int ret;
1106
1107 _enter("{%x:%u},{%pd},%s",
1108 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1109 content);
1110
1111 ret = -ENAMETOOLONG;
1112 if (dentry->d_name.len >= AFSNAMEMAX)
1113 goto error;
1114
1115 ret = -EINVAL;
1116 if (strlen(content) >= AFSPATHMAX)
1117 goto error;
1118
1119 key = afs_request_key(dvnode->volume->cell);
1120 if (IS_ERR(key)) {
1121 ret = PTR_ERR(key);
1122 goto error;
1123 }
1124
1125 ret = -ERESTARTSYS;
1126 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1127 while (afs_select_fileserver(&fc)) {
1128 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1129 afs_fs_symlink(&fc, dentry->d_name.name, content,
1130 &newfid, &newstatus);
1131 }
1132
1133 afs_check_for_remote_deletion(&fc, fc.vnode);
1134 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1135 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
1136 ret = afs_end_vnode_operation(&fc);
1137 if (ret < 0)
1138 goto error_key;
1139 } else {
1140 goto error_key;
1141 }
1142
1143 key_put(key);
1144 _leave(" = 0");
1145 return 0;
1146
1147 error_key:
1148 key_put(key);
1149 error:
1150 d_drop(dentry);
1151 _leave(" = %d", ret);
1152 return ret;
1153 }
1154
1155 /*
1156 * rename a file in an AFS filesystem and/or move it between directories
1157 */
1158 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1159 struct inode *new_dir, struct dentry *new_dentry,
1160 unsigned int flags)
1161 {
1162 struct afs_fs_cursor fc;
1163 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1164 struct key *key;
1165 int ret;
1166
1167 if (flags)
1168 return -EINVAL;
1169
1170 vnode = AFS_FS_I(d_inode(old_dentry));
1171 orig_dvnode = AFS_FS_I(old_dir);
1172 new_dvnode = AFS_FS_I(new_dir);
1173
1174 _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}",
1175 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1176 vnode->fid.vid, vnode->fid.vnode,
1177 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1178 new_dentry);
1179
1180 key = afs_request_key(orig_dvnode->volume->cell);
1181 if (IS_ERR(key)) {
1182 ret = PTR_ERR(key);
1183 goto error;
1184 }
1185
1186 ret = -ERESTARTSYS;
1187 if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
1188 if (orig_dvnode != new_dvnode) {
1189 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1190 afs_end_vnode_operation(&fc);
1191 goto error_key;
1192 }
1193 }
1194 while (afs_select_fileserver(&fc)) {
1195 fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break;
1196 fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break;
1197 afs_fs_rename(&fc, old_dentry->d_name.name,
1198 new_dvnode, new_dentry->d_name.name);
1199 }
1200
1201 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
1202 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
1203 if (orig_dvnode != new_dvnode)
1204 mutex_unlock(&new_dvnode->io_lock);
1205 ret = afs_end_vnode_operation(&fc);
1206 if (ret < 0)
1207 goto error_key;
1208 }
1209
1210 error_key:
1211 key_put(key);
1212 error:
1213 _leave(" = %d", ret);
1214 return ret;
1215 }
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