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1da177e4 LT |
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> | |
1da177e4 LT |
15 | #include <linux/slab.h> |
16 | #include <linux/fs.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/smp_lock.h> | |
19 | #include "vnode.h" | |
20 | #include "volume.h" | |
21 | #include <rxrpc/call.h> | |
22 | #include "super.h" | |
23 | #include "internal.h" | |
24 | ||
25 | static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry, | |
26 | struct nameidata *nd); | |
27 | static int afs_dir_open(struct inode *inode, struct file *file); | |
28 | static int afs_dir_readdir(struct file *file, void *dirent, filldir_t filldir); | |
29 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); | |
30 | static int afs_d_delete(struct dentry *dentry); | |
31 | static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen, | |
afefdbb2 | 32 | loff_t fpos, u64 ino, unsigned dtype); |
1da177e4 | 33 | |
4b6f5d20 | 34 | const struct file_operations afs_dir_file_operations = { |
1da177e4 LT |
35 | .open = afs_dir_open, |
36 | .readdir = afs_dir_readdir, | |
37 | }; | |
38 | ||
754661f1 | 39 | const struct inode_operations afs_dir_inode_operations = { |
1da177e4 LT |
40 | .lookup = afs_dir_lookup, |
41 | .getattr = afs_inode_getattr, | |
42 | #if 0 /* TODO */ | |
43 | .create = afs_dir_create, | |
44 | .link = afs_dir_link, | |
45 | .unlink = afs_dir_unlink, | |
46 | .symlink = afs_dir_symlink, | |
47 | .mkdir = afs_dir_mkdir, | |
48 | .rmdir = afs_dir_rmdir, | |
49 | .mknod = afs_dir_mknod, | |
50 | .rename = afs_dir_rename, | |
51 | #endif | |
52 | }; | |
53 | ||
54 | static struct dentry_operations afs_fs_dentry_operations = { | |
55 | .d_revalidate = afs_d_revalidate, | |
56 | .d_delete = afs_d_delete, | |
57 | }; | |
58 | ||
59 | #define AFS_DIR_HASHTBL_SIZE 128 | |
60 | #define AFS_DIR_DIRENT_SIZE 32 | |
61 | #define AFS_DIRENT_PER_BLOCK 64 | |
62 | ||
63 | union afs_dirent { | |
64 | struct { | |
65 | uint8_t valid; | |
66 | uint8_t unused[1]; | |
67 | __be16 hash_next; | |
68 | __be32 vnode; | |
69 | __be32 unique; | |
70 | uint8_t name[16]; | |
71 | uint8_t overflow[4]; /* if any char of the name (inc | |
72 | * NUL) reaches here, consume | |
73 | * the next dirent too */ | |
74 | } u; | |
75 | uint8_t extended_name[32]; | |
76 | }; | |
77 | ||
78 | /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ | |
79 | struct afs_dir_pagehdr { | |
80 | __be16 npages; | |
81 | __be16 magic; | |
82 | #define AFS_DIR_MAGIC htons(1234) | |
83 | uint8_t nentries; | |
84 | uint8_t bitmap[8]; | |
85 | uint8_t pad[19]; | |
86 | }; | |
87 | ||
88 | /* directory block layout */ | |
89 | union afs_dir_block { | |
90 | ||
91 | struct afs_dir_pagehdr pagehdr; | |
92 | ||
93 | struct { | |
94 | struct afs_dir_pagehdr pagehdr; | |
95 | uint8_t alloc_ctrs[128]; | |
96 | /* dir hash table */ | |
97 | uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; | |
98 | } hdr; | |
99 | ||
100 | union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; | |
101 | }; | |
102 | ||
103 | /* layout on a linux VM page */ | |
104 | struct afs_dir_page { | |
105 | union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; | |
106 | }; | |
107 | ||
108 | struct afs_dir_lookup_cookie { | |
109 | struct afs_fid fid; | |
110 | const char *name; | |
111 | size_t nlen; | |
112 | int found; | |
113 | }; | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * check that a directory page is valid | |
117 | */ | |
118 | static inline void afs_dir_check_page(struct inode *dir, struct page *page) | |
119 | { | |
120 | struct afs_dir_page *dbuf; | |
121 | loff_t latter; | |
122 | int tmp, qty; | |
123 | ||
124 | #if 0 | |
125 | /* check the page count */ | |
126 | qty = desc.size / sizeof(dbuf->blocks[0]); | |
127 | if (qty == 0) | |
128 | goto error; | |
129 | ||
130 | if (page->index==0 && qty!=ntohs(dbuf->blocks[0].pagehdr.npages)) { | |
131 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", | |
132 | __FUNCTION__,dir->i_ino,qty,ntohs(dbuf->blocks[0].pagehdr.npages)); | |
133 | goto error; | |
134 | } | |
135 | #endif | |
136 | ||
137 | /* determine how many magic numbers there should be in this page */ | |
54b21a79 | 138 | latter = dir->i_size - page_offset(page); |
1da177e4 LT |
139 | if (latter >= PAGE_SIZE) |
140 | qty = PAGE_SIZE; | |
141 | else | |
142 | qty = latter; | |
143 | qty /= sizeof(union afs_dir_block); | |
144 | ||
145 | /* check them */ | |
146 | dbuf = page_address(page); | |
147 | for (tmp = 0; tmp < qty; tmp++) { | |
148 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
149 | printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", | |
150 | __FUNCTION__, dir->i_ino, tmp, qty, | |
151 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); | |
152 | goto error; | |
153 | } | |
154 | } | |
155 | ||
156 | SetPageChecked(page); | |
157 | return; | |
158 | ||
ec26815a | 159 | error: |
1da177e4 LT |
160 | SetPageChecked(page); |
161 | SetPageError(page); | |
ec26815a | 162 | } |
1da177e4 | 163 | |
1da177e4 LT |
164 | /* |
165 | * discard a page cached in the pagecache | |
166 | */ | |
167 | static inline void afs_dir_put_page(struct page *page) | |
168 | { | |
169 | kunmap(page); | |
170 | page_cache_release(page); | |
ec26815a | 171 | } |
1da177e4 | 172 | |
1da177e4 LT |
173 | /* |
174 | * get a page into the pagecache | |
175 | */ | |
176 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index) | |
177 | { | |
178 | struct page *page; | |
179 | ||
180 | _enter("{%lu},%lu", dir->i_ino, index); | |
181 | ||
090d2b18 | 182 | page = read_mapping_page(dir->i_mapping, index, NULL); |
1da177e4 LT |
183 | if (!IS_ERR(page)) { |
184 | wait_on_page_locked(page); | |
185 | kmap(page); | |
186 | if (!PageUptodate(page)) | |
187 | goto fail; | |
188 | if (!PageChecked(page)) | |
189 | afs_dir_check_page(dir, page); | |
190 | if (PageError(page)) | |
191 | goto fail; | |
192 | } | |
193 | return page; | |
194 | ||
ec26815a | 195 | fail: |
1da177e4 LT |
196 | afs_dir_put_page(page); |
197 | return ERR_PTR(-EIO); | |
ec26815a | 198 | } |
1da177e4 | 199 | |
1da177e4 LT |
200 | /* |
201 | * open an AFS directory file | |
202 | */ | |
203 | static int afs_dir_open(struct inode *inode, struct file *file) | |
204 | { | |
205 | _enter("{%lu}", inode->i_ino); | |
206 | ||
2ecd05ae AD |
207 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
208 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 LT |
209 | |
210 | if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) | |
211 | return -ENOENT; | |
212 | ||
213 | _leave(" = 0"); | |
214 | return 0; | |
ec26815a | 215 | } |
1da177e4 | 216 | |
1da177e4 LT |
217 | /* |
218 | * deal with one block in an AFS directory | |
219 | */ | |
220 | static int afs_dir_iterate_block(unsigned *fpos, | |
221 | union afs_dir_block *block, | |
222 | unsigned blkoff, | |
223 | void *cookie, | |
224 | filldir_t filldir) | |
225 | { | |
226 | union afs_dirent *dire; | |
227 | unsigned offset, next, curr; | |
228 | size_t nlen; | |
229 | int tmp, ret; | |
230 | ||
231 | _enter("%u,%x,%p,,",*fpos,blkoff,block); | |
232 | ||
233 | curr = (*fpos - blkoff) / sizeof(union afs_dirent); | |
234 | ||
235 | /* walk through the block, an entry at a time */ | |
236 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
237 | offset < AFS_DIRENT_PER_BLOCK; | |
238 | offset = next | |
239 | ) { | |
240 | next = offset + 1; | |
241 | ||
242 | /* skip entries marked unused in the bitmap */ | |
243 | if (!(block->pagehdr.bitmap[offset / 8] & | |
244 | (1 << (offset % 8)))) { | |
245 | _debug("ENT[%Zu.%u]: unused\n", | |
246 | blkoff / sizeof(union afs_dir_block), offset); | |
247 | if (offset >= curr) | |
248 | *fpos = blkoff + | |
249 | next * sizeof(union afs_dirent); | |
250 | continue; | |
251 | } | |
252 | ||
253 | /* got a valid entry */ | |
254 | dire = &block->dirents[offset]; | |
255 | nlen = strnlen(dire->u.name, | |
256 | sizeof(*block) - | |
257 | offset * sizeof(union afs_dirent)); | |
258 | ||
259 | _debug("ENT[%Zu.%u]: %s %Zu \"%s\"\n", | |
260 | blkoff / sizeof(union afs_dir_block), offset, | |
261 | (offset < curr ? "skip" : "fill"), | |
262 | nlen, dire->u.name); | |
263 | ||
264 | /* work out where the next possible entry is */ | |
265 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
266 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
267 | _debug("ENT[%Zu.%u]:" | |
268 | " %u travelled beyond end dir block" | |
269 | " (len %u/%Zu)\n", | |
270 | blkoff / sizeof(union afs_dir_block), | |
271 | offset, next, tmp, nlen); | |
272 | return -EIO; | |
273 | } | |
274 | if (!(block->pagehdr.bitmap[next / 8] & | |
275 | (1 << (next % 8)))) { | |
276 | _debug("ENT[%Zu.%u]:" | |
277 | " %u unmarked extension (len %u/%Zu)\n", | |
278 | blkoff / sizeof(union afs_dir_block), | |
279 | offset, next, tmp, nlen); | |
280 | return -EIO; | |
281 | } | |
282 | ||
283 | _debug("ENT[%Zu.%u]: ext %u/%Zu\n", | |
284 | blkoff / sizeof(union afs_dir_block), | |
285 | next, tmp, nlen); | |
286 | next++; | |
287 | } | |
288 | ||
289 | /* skip if starts before the current position */ | |
290 | if (offset < curr) | |
291 | continue; | |
292 | ||
293 | /* found the next entry */ | |
294 | ret = filldir(cookie, | |
295 | dire->u.name, | |
296 | nlen, | |
297 | blkoff + offset * sizeof(union afs_dirent), | |
298 | ntohl(dire->u.vnode), | |
299 | filldir == afs_dir_lookup_filldir ? | |
300 | ntohl(dire->u.unique) : DT_UNKNOWN); | |
301 | if (ret < 0) { | |
302 | _leave(" = 0 [full]"); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | *fpos = blkoff + next * sizeof(union afs_dirent); | |
307 | } | |
308 | ||
309 | _leave(" = 1 [more]"); | |
310 | return 1; | |
ec26815a | 311 | } |
1da177e4 | 312 | |
1da177e4 LT |
313 | /* |
314 | * read an AFS directory | |
315 | */ | |
316 | static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, | |
317 | filldir_t filldir) | |
318 | { | |
319 | union afs_dir_block *dblock; | |
320 | struct afs_dir_page *dbuf; | |
321 | struct page *page; | |
322 | unsigned blkoff, limit; | |
323 | int ret; | |
324 | ||
325 | _enter("{%lu},%u,,", dir->i_ino, *fpos); | |
326 | ||
327 | if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) { | |
328 | _leave(" = -ESTALE"); | |
329 | return -ESTALE; | |
330 | } | |
331 | ||
332 | /* round the file position up to the next entry boundary */ | |
333 | *fpos += sizeof(union afs_dirent) - 1; | |
334 | *fpos &= ~(sizeof(union afs_dirent) - 1); | |
335 | ||
336 | /* walk through the blocks in sequence */ | |
337 | ret = 0; | |
338 | while (*fpos < dir->i_size) { | |
339 | blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); | |
340 | ||
341 | /* fetch the appropriate page from the directory */ | |
342 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE); | |
343 | if (IS_ERR(page)) { | |
344 | ret = PTR_ERR(page); | |
345 | break; | |
346 | } | |
347 | ||
348 | limit = blkoff & ~(PAGE_SIZE - 1); | |
349 | ||
350 | dbuf = page_address(page); | |
351 | ||
352 | /* deal with the individual blocks stashed on this page */ | |
353 | do { | |
354 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
355 | sizeof(union afs_dir_block)]; | |
356 | ret = afs_dir_iterate_block(fpos, dblock, blkoff, | |
357 | cookie, filldir); | |
358 | if (ret != 1) { | |
359 | afs_dir_put_page(page); | |
360 | goto out; | |
361 | } | |
362 | ||
363 | blkoff += sizeof(union afs_dir_block); | |
364 | ||
365 | } while (*fpos < dir->i_size && blkoff < limit); | |
366 | ||
367 | afs_dir_put_page(page); | |
368 | ret = 0; | |
369 | } | |
370 | ||
ec26815a | 371 | out: |
1da177e4 LT |
372 | _leave(" = %d", ret); |
373 | return ret; | |
ec26815a | 374 | } |
1da177e4 | 375 | |
1da177e4 LT |
376 | /* |
377 | * read an AFS directory | |
378 | */ | |
379 | static int afs_dir_readdir(struct file *file, void *cookie, filldir_t filldir) | |
380 | { | |
381 | unsigned fpos; | |
382 | int ret; | |
383 | ||
1d56a969 | 384 | _enter("{%Ld,{%lu}}", file->f_pos, file->f_path.dentry->d_inode->i_ino); |
1da177e4 LT |
385 | |
386 | fpos = file->f_pos; | |
1d56a969 | 387 | ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, cookie, filldir); |
1da177e4 LT |
388 | file->f_pos = fpos; |
389 | ||
390 | _leave(" = %d", ret); | |
391 | return ret; | |
ec26815a | 392 | } |
1da177e4 | 393 | |
1da177e4 LT |
394 | /* |
395 | * search the directory for a name | |
396 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
397 | * uniquifier through dtype | |
398 | */ | |
399 | static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen, | |
afefdbb2 | 400 | loff_t fpos, u64 ino, unsigned dtype) |
1da177e4 LT |
401 | { |
402 | struct afs_dir_lookup_cookie *cookie = _cookie; | |
403 | ||
404 | _enter("{%s,%Zu},%s,%u,,%lu,%u", | |
405 | cookie->name, cookie->nlen, name, nlen, ino, dtype); | |
406 | ||
407 | if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { | |
408 | _leave(" = 0 [no]"); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | cookie->fid.vnode = ino; | |
413 | cookie->fid.unique = dtype; | |
414 | cookie->found = 1; | |
415 | ||
416 | _leave(" = -1 [found]"); | |
417 | return -1; | |
ec26815a | 418 | } |
1da177e4 | 419 | |
1da177e4 LT |
420 | /* |
421 | * look up an entry in a directory | |
422 | */ | |
423 | static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry, | |
424 | struct nameidata *nd) | |
425 | { | |
426 | struct afs_dir_lookup_cookie cookie; | |
427 | struct afs_super_info *as; | |
428 | struct afs_vnode *vnode; | |
429 | struct inode *inode; | |
430 | unsigned fpos; | |
431 | int ret; | |
432 | ||
433 | _enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name); | |
434 | ||
435 | /* insanity checks first */ | |
2ecd05ae AD |
436 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
437 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 LT |
438 | |
439 | if (dentry->d_name.len > 255) { | |
440 | _leave(" = -ENAMETOOLONG"); | |
441 | return ERR_PTR(-ENAMETOOLONG); | |
442 | } | |
443 | ||
444 | vnode = AFS_FS_I(dir); | |
445 | if (vnode->flags & AFS_VNODE_DELETED) { | |
446 | _leave(" = -ESTALE"); | |
447 | return ERR_PTR(-ESTALE); | |
448 | } | |
449 | ||
450 | as = dir->i_sb->s_fs_info; | |
451 | ||
452 | /* search the directory */ | |
453 | cookie.name = dentry->d_name.name; | |
454 | cookie.nlen = dentry->d_name.len; | |
455 | cookie.fid.vid = as->volume->vid; | |
456 | cookie.found = 0; | |
457 | ||
458 | fpos = 0; | |
459 | ret = afs_dir_iterate(dir, &fpos, &cookie, afs_dir_lookup_filldir); | |
460 | if (ret < 0) { | |
461 | _leave(" = %d", ret); | |
462 | return ERR_PTR(ret); | |
463 | } | |
464 | ||
465 | ret = -ENOENT; | |
466 | if (!cookie.found) { | |
467 | _leave(" = %d", ret); | |
468 | return ERR_PTR(ret); | |
469 | } | |
470 | ||
471 | /* instantiate the dentry */ | |
472 | ret = afs_iget(dir->i_sb, &cookie.fid, &inode); | |
473 | if (ret < 0) { | |
474 | _leave(" = %d", ret); | |
475 | return ERR_PTR(ret); | |
476 | } | |
477 | ||
478 | dentry->d_op = &afs_fs_dentry_operations; | |
479 | dentry->d_fsdata = (void *) (unsigned long) vnode->status.version; | |
480 | ||
481 | d_add(dentry, inode); | |
482 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }", | |
483 | cookie.fid.vnode, | |
484 | cookie.fid.unique, | |
485 | dentry->d_inode->i_ino, | |
486 | dentry->d_inode->i_version); | |
487 | ||
488 | return NULL; | |
ec26815a | 489 | } |
1da177e4 | 490 | |
1da177e4 LT |
491 | /* |
492 | * check that a dentry lookup hit has found a valid entry | |
493 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
494 | * inode | |
495 | * (derived from nfs_lookup_revalidate) | |
496 | */ | |
497 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
498 | { | |
499 | struct afs_dir_lookup_cookie cookie; | |
500 | struct dentry *parent; | |
501 | struct inode *inode, *dir; | |
502 | unsigned fpos; | |
503 | int ret; | |
504 | ||
505 | _enter("{sb=%p n=%s},", dentry->d_sb, dentry->d_name.name); | |
506 | ||
507 | /* lock down the parent dentry so we can peer at it */ | |
508 | parent = dget_parent(dentry->d_parent); | |
509 | ||
510 | dir = parent->d_inode; | |
511 | inode = dentry->d_inode; | |
512 | ||
513 | /* handle a negative dentry */ | |
514 | if (!inode) | |
515 | goto out_bad; | |
516 | ||
517 | /* handle a bad inode */ | |
518 | if (is_bad_inode(inode)) { | |
519 | printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", | |
520 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
521 | goto out_bad; | |
522 | } | |
523 | ||
524 | /* force a full look up if the parent directory changed since last the | |
525 | * server was consulted | |
526 | * - otherwise this inode must still exist, even if the inode details | |
527 | * themselves have changed | |
528 | */ | |
529 | if (AFS_FS_I(dir)->flags & AFS_VNODE_CHANGED) | |
530 | afs_vnode_fetch_status(AFS_FS_I(dir)); | |
531 | ||
532 | if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) { | |
533 | _debug("%s: parent dir deleted", dentry->d_name.name); | |
534 | goto out_bad; | |
535 | } | |
536 | ||
537 | if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) { | |
538 | _debug("%s: file already deleted", dentry->d_name.name); | |
539 | goto out_bad; | |
540 | } | |
541 | ||
542 | if ((unsigned long) dentry->d_fsdata != | |
543 | (unsigned long) AFS_FS_I(dir)->status.version) { | |
544 | _debug("%s: parent changed %lu -> %u", | |
545 | dentry->d_name.name, | |
546 | (unsigned long) dentry->d_fsdata, | |
547 | (unsigned) AFS_FS_I(dir)->status.version); | |
548 | ||
549 | /* search the directory for this vnode */ | |
550 | cookie.name = dentry->d_name.name; | |
551 | cookie.nlen = dentry->d_name.len; | |
552 | cookie.fid.vid = AFS_FS_I(inode)->volume->vid; | |
553 | cookie.found = 0; | |
554 | ||
555 | fpos = 0; | |
556 | ret = afs_dir_iterate(dir, &fpos, &cookie, | |
557 | afs_dir_lookup_filldir); | |
558 | if (ret < 0) { | |
559 | _debug("failed to iterate dir %s: %d", | |
560 | parent->d_name.name, ret); | |
561 | goto out_bad; | |
562 | } | |
563 | ||
564 | if (!cookie.found) { | |
565 | _debug("%s: dirent not found", dentry->d_name.name); | |
566 | goto not_found; | |
567 | } | |
568 | ||
569 | /* if the vnode ID has changed, then the dirent points to a | |
570 | * different file */ | |
571 | if (cookie.fid.vnode != AFS_FS_I(inode)->fid.vnode) { | |
572 | _debug("%s: dirent changed", dentry->d_name.name); | |
573 | goto not_found; | |
574 | } | |
575 | ||
576 | /* if the vnode ID uniqifier has changed, then the file has | |
577 | * been deleted */ | |
578 | if (cookie.fid.unique != AFS_FS_I(inode)->fid.unique) { | |
579 | _debug("%s: file deleted (uq %u -> %u I:%lu)", | |
580 | dentry->d_name.name, | |
581 | cookie.fid.unique, | |
582 | AFS_FS_I(inode)->fid.unique, | |
583 | inode->i_version); | |
584 | spin_lock(&AFS_FS_I(inode)->lock); | |
585 | AFS_FS_I(inode)->flags |= AFS_VNODE_DELETED; | |
586 | spin_unlock(&AFS_FS_I(inode)->lock); | |
587 | invalidate_remote_inode(inode); | |
588 | goto out_bad; | |
589 | } | |
590 | ||
591 | dentry->d_fsdata = | |
592 | (void *) (unsigned long) AFS_FS_I(dir)->status.version; | |
593 | } | |
594 | ||
ec26815a | 595 | out_valid: |
1da177e4 LT |
596 | dput(parent); |
597 | _leave(" = 1 [valid]"); | |
598 | return 1; | |
599 | ||
600 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 601 | not_found: |
1da177e4 LT |
602 | spin_lock(&dentry->d_lock); |
603 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
604 | spin_unlock(&dentry->d_lock); | |
605 | ||
ec26815a | 606 | out_bad: |
1da177e4 LT |
607 | if (inode) { |
608 | /* don't unhash if we have submounts */ | |
609 | if (have_submounts(dentry)) | |
610 | goto out_valid; | |
611 | } | |
612 | ||
613 | shrink_dcache_parent(dentry); | |
614 | ||
615 | _debug("dropping dentry %s/%s", | |
616 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
617 | d_drop(dentry); | |
618 | ||
619 | dput(parent); | |
620 | ||
621 | _leave(" = 0 [bad]"); | |
622 | return 0; | |
ec26815a | 623 | } |
1da177e4 | 624 | |
1da177e4 LT |
625 | /* |
626 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
627 | * sleep) | |
628 | * - called from dput() when d_count is going to 0. | |
629 | * - return 1 to request dentry be unhashed, 0 otherwise | |
630 | */ | |
631 | static int afs_d_delete(struct dentry *dentry) | |
632 | { | |
633 | _enter("%s", dentry->d_name.name); | |
634 | ||
635 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
636 | goto zap; | |
637 | ||
638 | if (dentry->d_inode) { | |
639 | if (AFS_FS_I(dentry->d_inode)->flags & AFS_VNODE_DELETED) | |
640 | goto zap; | |
641 | } | |
642 | ||
643 | _leave(" = 0 [keep]"); | |
644 | return 0; | |
645 | ||
ec26815a | 646 | zap: |
1da177e4 LT |
647 | _leave(" = 1 [zap]"); |
648 | return 1; | |
ec26815a | 649 | } |