Commit | Line | Data |
---|---|---|
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> | |
00d3b7a4 | 18 | #include <linux/ctype.h> |
e8edc6e0 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include "internal.h" |
21 | ||
260a9803 DH |
22 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
23 | struct nameidata *nd); | |
1da177e4 | 24 | static int afs_dir_open(struct inode *inode, struct file *file); |
260a9803 | 25 | static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); |
1da177e4 LT |
26 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); |
27 | static int afs_d_delete(struct dentry *dentry); | |
260a9803 DH |
28 | static void afs_d_release(struct dentry *dentry); |
29 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, | |
afefdbb2 | 30 | loff_t fpos, u64 ino, unsigned dtype); |
260a9803 DH |
31 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, |
32 | struct nameidata *nd); | |
33 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int 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); | |
1da177e4 | 42 | |
4b6f5d20 | 43 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 44 | .open = afs_dir_open, |
00d3b7a4 | 45 | .release = afs_release, |
260a9803 | 46 | .readdir = afs_readdir, |
e8d6c554 | 47 | .lock = afs_lock, |
1da177e4 LT |
48 | }; |
49 | ||
754661f1 | 50 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
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, | |
00d3b7a4 | 59 | .permission = afs_permission, |
416351f2 | 60 | .getattr = afs_getattr, |
31143d5d | 61 | .setattr = afs_setattr, |
1da177e4 LT |
62 | }; |
63 | ||
64 | static struct dentry_operations afs_fs_dentry_operations = { | |
65 | .d_revalidate = afs_d_revalidate, | |
66 | .d_delete = afs_d_delete, | |
260a9803 | 67 | .d_release = afs_d_release, |
1da177e4 LT |
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 | ||
260a9803 | 119 | struct afs_lookup_cookie { |
1da177e4 LT |
120 | struct afs_fid fid; |
121 | const char *name; | |
122 | size_t nlen; | |
123 | int found; | |
124 | }; | |
125 | ||
1da177e4 LT |
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 | ||
08e0e7c8 | 141 | if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
1da177e4 | 142 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
08e0e7c8 DH |
143 | __FUNCTION__, dir->i_ino, qty, |
144 | ntohs(dbuf->blocks[0].pagehdr.npages)); | |
1da177e4 LT |
145 | goto error; |
146 | } | |
147 | #endif | |
148 | ||
149 | /* determine how many magic numbers there should be in this page */ | |
54b21a79 | 150 | latter = dir->i_size - page_offset(page); |
1da177e4 LT |
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 | __FUNCTION__, dir->i_ino, tmp, qty, | |
163 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); | |
164 | goto error; | |
165 | } | |
166 | } | |
167 | ||
168 | SetPageChecked(page); | |
169 | return; | |
170 | ||
ec26815a | 171 | error: |
1da177e4 LT |
172 | SetPageChecked(page); |
173 | SetPageError(page); | |
ec26815a | 174 | } |
1da177e4 | 175 | |
1da177e4 LT |
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); | |
ec26815a | 183 | } |
1da177e4 | 184 | |
1da177e4 LT |
185 | /* |
186 | * get a page into the pagecache | |
187 | */ | |
00d3b7a4 DH |
188 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
189 | struct key *key) | |
1da177e4 LT |
190 | { |
191 | struct page *page; | |
00d3b7a4 DH |
192 | struct file file = { |
193 | .private_data = key, | |
194 | }; | |
1da177e4 LT |
195 | |
196 | _enter("{%lu},%lu", dir->i_ino, index); | |
197 | ||
00d3b7a4 | 198 | page = read_mapping_page(dir->i_mapping, index, &file); |
1da177e4 | 199 | if (!IS_ERR(page)) { |
1da177e4 | 200 | kmap(page); |
1da177e4 LT |
201 | if (!PageChecked(page)) |
202 | afs_dir_check_page(dir, page); | |
203 | if (PageError(page)) | |
204 | goto fail; | |
205 | } | |
206 | return page; | |
207 | ||
ec26815a | 208 | fail: |
1da177e4 | 209 | afs_dir_put_page(page); |
08e0e7c8 | 210 | _leave(" = -EIO"); |
1da177e4 | 211 | return ERR_PTR(-EIO); |
ec26815a | 212 | } |
1da177e4 | 213 | |
1da177e4 LT |
214 | /* |
215 | * open an AFS directory file | |
216 | */ | |
217 | static int afs_dir_open(struct inode *inode, struct file *file) | |
218 | { | |
219 | _enter("{%lu}", inode->i_ino); | |
220 | ||
2ecd05ae AD |
221 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
222 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 223 | |
08e0e7c8 | 224 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
225 | return -ENOENT; |
226 | ||
00d3b7a4 | 227 | return afs_open(inode, file); |
ec26815a | 228 | } |
1da177e4 | 229 | |
1da177e4 LT |
230 | /* |
231 | * deal with one block in an AFS directory | |
232 | */ | |
233 | static int afs_dir_iterate_block(unsigned *fpos, | |
234 | union afs_dir_block *block, | |
235 | unsigned blkoff, | |
236 | void *cookie, | |
237 | filldir_t filldir) | |
238 | { | |
239 | union afs_dirent *dire; | |
240 | unsigned offset, next, curr; | |
241 | size_t nlen; | |
242 | int tmp, ret; | |
243 | ||
244 | _enter("%u,%x,%p,,",*fpos,blkoff,block); | |
245 | ||
246 | curr = (*fpos - blkoff) / sizeof(union afs_dirent); | |
247 | ||
248 | /* walk through the block, an entry at a time */ | |
249 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
250 | offset < AFS_DIRENT_PER_BLOCK; | |
251 | offset = next | |
252 | ) { | |
253 | next = offset + 1; | |
254 | ||
255 | /* skip entries marked unused in the bitmap */ | |
256 | if (!(block->pagehdr.bitmap[offset / 8] & | |
257 | (1 << (offset % 8)))) { | |
08e0e7c8 | 258 | _debug("ENT[%Zu.%u]: unused", |
1da177e4 LT |
259 | blkoff / sizeof(union afs_dir_block), offset); |
260 | if (offset >= curr) | |
261 | *fpos = blkoff + | |
262 | next * sizeof(union afs_dirent); | |
263 | continue; | |
264 | } | |
265 | ||
266 | /* got a valid entry */ | |
267 | dire = &block->dirents[offset]; | |
268 | nlen = strnlen(dire->u.name, | |
269 | sizeof(*block) - | |
270 | offset * sizeof(union afs_dirent)); | |
271 | ||
08e0e7c8 | 272 | _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
1da177e4 LT |
273 | blkoff / sizeof(union afs_dir_block), offset, |
274 | (offset < curr ? "skip" : "fill"), | |
275 | nlen, dire->u.name); | |
276 | ||
277 | /* work out where the next possible entry is */ | |
278 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
279 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
280 | _debug("ENT[%Zu.%u]:" | |
281 | " %u travelled beyond end dir block" | |
08e0e7c8 | 282 | " (len %u/%Zu)", |
1da177e4 LT |
283 | blkoff / sizeof(union afs_dir_block), |
284 | offset, next, tmp, nlen); | |
285 | return -EIO; | |
286 | } | |
287 | if (!(block->pagehdr.bitmap[next / 8] & | |
288 | (1 << (next % 8)))) { | |
289 | _debug("ENT[%Zu.%u]:" | |
08e0e7c8 | 290 | " %u unmarked extension (len %u/%Zu)", |
1da177e4 LT |
291 | blkoff / sizeof(union afs_dir_block), |
292 | offset, next, tmp, nlen); | |
293 | return -EIO; | |
294 | } | |
295 | ||
08e0e7c8 | 296 | _debug("ENT[%Zu.%u]: ext %u/%Zu", |
1da177e4 LT |
297 | blkoff / sizeof(union afs_dir_block), |
298 | next, tmp, nlen); | |
299 | next++; | |
300 | } | |
301 | ||
302 | /* skip if starts before the current position */ | |
303 | if (offset < curr) | |
304 | continue; | |
305 | ||
306 | /* found the next entry */ | |
307 | ret = filldir(cookie, | |
308 | dire->u.name, | |
309 | nlen, | |
310 | blkoff + offset * sizeof(union afs_dirent), | |
311 | ntohl(dire->u.vnode), | |
260a9803 | 312 | filldir == afs_lookup_filldir ? |
1da177e4 LT |
313 | ntohl(dire->u.unique) : DT_UNKNOWN); |
314 | if (ret < 0) { | |
315 | _leave(" = 0 [full]"); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | *fpos = blkoff + next * sizeof(union afs_dirent); | |
320 | } | |
321 | ||
322 | _leave(" = 1 [more]"); | |
323 | return 1; | |
ec26815a | 324 | } |
1da177e4 | 325 | |
1da177e4 | 326 | /* |
08e0e7c8 | 327 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 LT |
328 | */ |
329 | static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, | |
00d3b7a4 | 330 | filldir_t filldir, struct key *key) |
1da177e4 | 331 | { |
08e0e7c8 | 332 | union afs_dir_block *dblock; |
1da177e4 LT |
333 | struct afs_dir_page *dbuf; |
334 | struct page *page; | |
335 | unsigned blkoff, limit; | |
336 | int ret; | |
337 | ||
338 | _enter("{%lu},%u,,", dir->i_ino, *fpos); | |
339 | ||
08e0e7c8 | 340 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
341 | _leave(" = -ESTALE"); |
342 | return -ESTALE; | |
343 | } | |
344 | ||
345 | /* round the file position up to the next entry boundary */ | |
346 | *fpos += sizeof(union afs_dirent) - 1; | |
347 | *fpos &= ~(sizeof(union afs_dirent) - 1); | |
348 | ||
349 | /* walk through the blocks in sequence */ | |
350 | ret = 0; | |
351 | while (*fpos < dir->i_size) { | |
352 | blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); | |
353 | ||
354 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 355 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
356 | if (IS_ERR(page)) { |
357 | ret = PTR_ERR(page); | |
358 | break; | |
359 | } | |
360 | ||
361 | limit = blkoff & ~(PAGE_SIZE - 1); | |
362 | ||
363 | dbuf = page_address(page); | |
364 | ||
365 | /* deal with the individual blocks stashed on this page */ | |
366 | do { | |
367 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
368 | sizeof(union afs_dir_block)]; | |
369 | ret = afs_dir_iterate_block(fpos, dblock, blkoff, | |
370 | cookie, filldir); | |
371 | if (ret != 1) { | |
372 | afs_dir_put_page(page); | |
373 | goto out; | |
374 | } | |
375 | ||
376 | blkoff += sizeof(union afs_dir_block); | |
377 | ||
378 | } while (*fpos < dir->i_size && blkoff < limit); | |
379 | ||
380 | afs_dir_put_page(page); | |
381 | ret = 0; | |
382 | } | |
383 | ||
ec26815a | 384 | out: |
1da177e4 LT |
385 | _leave(" = %d", ret); |
386 | return ret; | |
ec26815a | 387 | } |
1da177e4 | 388 | |
1da177e4 LT |
389 | /* |
390 | * read an AFS directory | |
391 | */ | |
260a9803 | 392 | static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) |
1da177e4 LT |
393 | { |
394 | unsigned fpos; | |
395 | int ret; | |
396 | ||
08e0e7c8 DH |
397 | _enter("{%Ld,{%lu}}", |
398 | file->f_pos, file->f_path.dentry->d_inode->i_ino); | |
1da177e4 | 399 | |
00d3b7a4 DH |
400 | ASSERT(file->private_data != NULL); |
401 | ||
1da177e4 | 402 | fpos = file->f_pos; |
08e0e7c8 | 403 | ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, |
00d3b7a4 | 404 | cookie, filldir, file->private_data); |
1da177e4 LT |
405 | file->f_pos = fpos; |
406 | ||
407 | _leave(" = %d", ret); | |
408 | return ret; | |
ec26815a | 409 | } |
1da177e4 | 410 | |
1da177e4 LT |
411 | /* |
412 | * search the directory for a name | |
413 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
414 | * uniquifier through dtype | |
415 | */ | |
260a9803 DH |
416 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, |
417 | loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 418 | { |
260a9803 | 419 | struct afs_lookup_cookie *cookie = _cookie; |
1da177e4 | 420 | |
08e0e7c8 | 421 | _enter("{%s,%Zu},%s,%u,,%llu,%u", |
ba3e0e1a DM |
422 | cookie->name, cookie->nlen, name, nlen, |
423 | (unsigned long long) ino, dtype); | |
1da177e4 | 424 | |
08e0e7c8 DH |
425 | /* insanity checks first */ |
426 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
427 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
428 | ||
1da177e4 LT |
429 | if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { |
430 | _leave(" = 0 [no]"); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | cookie->fid.vnode = ino; | |
435 | cookie->fid.unique = dtype; | |
436 | cookie->found = 1; | |
437 | ||
438 | _leave(" = -1 [found]"); | |
439 | return -1; | |
ec26815a | 440 | } |
1da177e4 | 441 | |
1da177e4 | 442 | /* |
08e0e7c8 | 443 | * do a lookup in a directory |
260a9803 | 444 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 445 | */ |
08e0e7c8 | 446 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 447 | struct afs_fid *fid, struct key *key) |
1da177e4 | 448 | { |
260a9803 | 449 | struct afs_lookup_cookie cookie; |
1da177e4 | 450 | struct afs_super_info *as; |
1da177e4 LT |
451 | unsigned fpos; |
452 | int ret; | |
453 | ||
08e0e7c8 | 454 | _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); |
1da177e4 LT |
455 | |
456 | as = dir->i_sb->s_fs_info; | |
457 | ||
458 | /* search the directory */ | |
459 | cookie.name = dentry->d_name.name; | |
460 | cookie.nlen = dentry->d_name.len; | |
461 | cookie.fid.vid = as->volume->vid; | |
462 | cookie.found = 0; | |
463 | ||
464 | fpos = 0; | |
260a9803 | 465 | ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, |
00d3b7a4 | 466 | key); |
1da177e4 | 467 | if (ret < 0) { |
08e0e7c8 DH |
468 | _leave(" = %d [iter]", ret); |
469 | return ret; | |
1da177e4 LT |
470 | } |
471 | ||
472 | ret = -ENOENT; | |
473 | if (!cookie.found) { | |
08e0e7c8 DH |
474 | _leave(" = -ENOENT [not found]"); |
475 | return -ENOENT; | |
1da177e4 LT |
476 | } |
477 | ||
08e0e7c8 DH |
478 | *fid = cookie.fid; |
479 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | /* | |
484 | * look up an entry in a directory | |
485 | */ | |
260a9803 DH |
486 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
487 | struct nameidata *nd) | |
08e0e7c8 DH |
488 | { |
489 | struct afs_vnode *vnode; | |
490 | struct afs_fid fid; | |
491 | struct inode *inode; | |
00d3b7a4 | 492 | struct key *key; |
08e0e7c8 DH |
493 | int ret; |
494 | ||
260a9803 DH |
495 | vnode = AFS_FS_I(dir); |
496 | ||
416351f2 | 497 | _enter("{%x:%u},%p{%s},", |
260a9803 DH |
498 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); |
499 | ||
500 | ASSERTCMP(dentry->d_inode, ==, NULL); | |
08e0e7c8 | 501 | |
45222b9e | 502 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
503 | _leave(" = -ENAMETOOLONG"); |
504 | return ERR_PTR(-ENAMETOOLONG); | |
505 | } | |
506 | ||
08e0e7c8 DH |
507 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
508 | _leave(" = -ESTALE"); | |
509 | return ERR_PTR(-ESTALE); | |
510 | } | |
511 | ||
00d3b7a4 DH |
512 | key = afs_request_key(vnode->volume->cell); |
513 | if (IS_ERR(key)) { | |
514 | _leave(" = %ld [key]", PTR_ERR(key)); | |
515 | return ERR_PTR(PTR_ERR(key)); | |
516 | } | |
517 | ||
260a9803 DH |
518 | ret = afs_validate(vnode, key); |
519 | if (ret < 0) { | |
520 | key_put(key); | |
521 | _leave(" = %d [val]", ret); | |
522 | return ERR_PTR(ret); | |
523 | } | |
524 | ||
00d3b7a4 | 525 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 526 | if (ret < 0) { |
00d3b7a4 | 527 | key_put(key); |
260a9803 DH |
528 | if (ret == -ENOENT) { |
529 | d_add(dentry, NULL); | |
530 | _leave(" = NULL [negative]"); | |
531 | return NULL; | |
532 | } | |
08e0e7c8 | 533 | _leave(" = %d [do]", ret); |
1da177e4 LT |
534 | return ERR_PTR(ret); |
535 | } | |
260a9803 | 536 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 537 | |
08e0e7c8 | 538 | /* instantiate the dentry */ |
260a9803 | 539 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
00d3b7a4 | 540 | key_put(key); |
08e0e7c8 DH |
541 | if (IS_ERR(inode)) { |
542 | _leave(" = %ld", PTR_ERR(inode)); | |
543 | return ERR_PTR(PTR_ERR(inode)); | |
544 | } | |
545 | ||
1da177e4 | 546 | dentry->d_op = &afs_fs_dentry_operations; |
1da177e4 LT |
547 | |
548 | d_add(dentry, inode); | |
549 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }", | |
08e0e7c8 DH |
550 | fid.vnode, |
551 | fid.unique, | |
1da177e4 LT |
552 | dentry->d_inode->i_ino, |
553 | dentry->d_inode->i_version); | |
554 | ||
555 | return NULL; | |
ec26815a | 556 | } |
1da177e4 | 557 | |
1da177e4 LT |
558 | /* |
559 | * check that a dentry lookup hit has found a valid entry | |
560 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
561 | * inode | |
1da177e4 LT |
562 | */ |
563 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
564 | { | |
260a9803 | 565 | struct afs_vnode *vnode, *dir; |
08e0e7c8 | 566 | struct afs_fid fid; |
1da177e4 | 567 | struct dentry *parent; |
00d3b7a4 | 568 | struct key *key; |
260a9803 | 569 | void *dir_version; |
1da177e4 LT |
570 | int ret; |
571 | ||
08e0e7c8 DH |
572 | vnode = AFS_FS_I(dentry->d_inode); |
573 | ||
260a9803 DH |
574 | if (dentry->d_inode) |
575 | _enter("{v={%x:%u} n=%s fl=%lx},", | |
576 | vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, | |
577 | vnode->flags); | |
578 | else | |
579 | _enter("{neg n=%s}", dentry->d_name.name); | |
1da177e4 | 580 | |
260a9803 | 581 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
582 | if (IS_ERR(key)) |
583 | key = NULL; | |
584 | ||
1da177e4 | 585 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 586 | parent = dget_parent(dentry); |
260a9803 | 587 | if (!parent->d_inode) |
1da177e4 LT |
588 | goto out_bad; |
589 | ||
260a9803 | 590 | dir = AFS_FS_I(parent->d_inode); |
1da177e4 | 591 | |
260a9803 DH |
592 | /* validate the parent directory */ |
593 | if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) | |
594 | afs_validate(dir, key); | |
595 | ||
596 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
1da177e4 LT |
597 | _debug("%s: parent dir deleted", dentry->d_name.name); |
598 | goto out_bad; | |
599 | } | |
600 | ||
260a9803 DH |
601 | dir_version = (void *) (unsigned long) dir->status.data_version; |
602 | if (dentry->d_fsdata == dir_version) | |
603 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 604 | |
260a9803 DH |
605 | _debug("dir modified"); |
606 | ||
607 | /* search the directory for this vnode */ | |
608 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
609 | switch (ret) { | |
610 | case 0: | |
611 | /* the filename maps to something */ | |
612 | if (!dentry->d_inode) | |
613 | goto out_bad; | |
614 | if (is_bad_inode(dentry->d_inode)) { | |
615 | printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", | |
616 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
617 | goto out_bad; |
618 | } | |
619 | ||
1da177e4 LT |
620 | /* if the vnode ID has changed, then the dirent points to a |
621 | * different file */ | |
08e0e7c8 DH |
622 | if (fid.vnode != vnode->fid.vnode) { |
623 | _debug("%s: dirent changed [%u != %u]", | |
624 | dentry->d_name.name, fid.vnode, | |
625 | vnode->fid.vnode); | |
1da177e4 LT |
626 | goto not_found; |
627 | } | |
628 | ||
629 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
630 | * been deleted and replaced, and the original vnode ID has |
631 | * been reused */ | |
08e0e7c8 | 632 | if (fid.unique != vnode->fid.unique) { |
1da177e4 | 633 | _debug("%s: file deleted (uq %u -> %u I:%lu)", |
08e0e7c8 | 634 | dentry->d_name.name, fid.unique, |
260a9803 | 635 | vnode->fid.unique, dentry->d_inode->i_version); |
08e0e7c8 DH |
636 | spin_lock(&vnode->lock); |
637 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
638 | spin_unlock(&vnode->lock); | |
260a9803 | 639 | goto not_found; |
1da177e4 | 640 | } |
260a9803 | 641 | goto out_valid; |
08e0e7c8 | 642 | |
260a9803 DH |
643 | case -ENOENT: |
644 | /* the filename is unknown */ | |
645 | _debug("%s: dirent not found", dentry->d_name.name); | |
646 | if (dentry->d_inode) | |
647 | goto not_found; | |
648 | goto out_valid; | |
1da177e4 | 649 | |
260a9803 DH |
650 | default: |
651 | _debug("failed to iterate dir %s: %d", | |
652 | parent->d_name.name, ret); | |
08e0e7c8 DH |
653 | goto out_bad; |
654 | } | |
655 | ||
ec26815a | 656 | out_valid: |
260a9803 DH |
657 | dentry->d_fsdata = dir_version; |
658 | out_skip: | |
1da177e4 | 659 | dput(parent); |
00d3b7a4 | 660 | key_put(key); |
1da177e4 LT |
661 | _leave(" = 1 [valid]"); |
662 | return 1; | |
663 | ||
664 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 665 | not_found: |
1da177e4 LT |
666 | spin_lock(&dentry->d_lock); |
667 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
668 | spin_unlock(&dentry->d_lock); | |
669 | ||
ec26815a | 670 | out_bad: |
260a9803 | 671 | if (dentry->d_inode) { |
1da177e4 LT |
672 | /* don't unhash if we have submounts */ |
673 | if (have_submounts(dentry)) | |
260a9803 | 674 | goto out_skip; |
1da177e4 LT |
675 | } |
676 | ||
1da177e4 | 677 | _debug("dropping dentry %s/%s", |
08e0e7c8 DH |
678 | parent->d_name.name, dentry->d_name.name); |
679 | shrink_dcache_parent(dentry); | |
1da177e4 | 680 | d_drop(dentry); |
1da177e4 | 681 | dput(parent); |
00d3b7a4 | 682 | key_put(key); |
1da177e4 LT |
683 | |
684 | _leave(" = 0 [bad]"); | |
685 | return 0; | |
ec26815a | 686 | } |
1da177e4 | 687 | |
1da177e4 LT |
688 | /* |
689 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
690 | * sleep) | |
691 | * - called from dput() when d_count is going to 0. | |
692 | * - return 1 to request dentry be unhashed, 0 otherwise | |
693 | */ | |
694 | static int afs_d_delete(struct dentry *dentry) | |
695 | { | |
696 | _enter("%s", dentry->d_name.name); | |
697 | ||
698 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
699 | goto zap; | |
700 | ||
08e0e7c8 DH |
701 | if (dentry->d_inode && |
702 | test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) | |
1da177e4 | 703 | goto zap; |
1da177e4 LT |
704 | |
705 | _leave(" = 0 [keep]"); | |
706 | return 0; | |
707 | ||
ec26815a | 708 | zap: |
1da177e4 LT |
709 | _leave(" = 1 [zap]"); |
710 | return 1; | |
ec26815a | 711 | } |
260a9803 DH |
712 | |
713 | /* | |
714 | * handle dentry release | |
715 | */ | |
716 | static void afs_d_release(struct dentry *dentry) | |
717 | { | |
718 | _enter("%s", dentry->d_name.name); | |
719 | } | |
720 | ||
721 | /* | |
722 | * create a directory on an AFS filesystem | |
723 | */ | |
724 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
725 | { | |
726 | struct afs_file_status status; | |
727 | struct afs_callback cb; | |
728 | struct afs_server *server; | |
729 | struct afs_vnode *dvnode, *vnode; | |
730 | struct afs_fid fid; | |
731 | struct inode *inode; | |
732 | struct key *key; | |
733 | int ret; | |
734 | ||
735 | dvnode = AFS_FS_I(dir); | |
736 | ||
416351f2 | 737 | _enter("{%x:%u},{%s},%o", |
260a9803 DH |
738 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
739 | ||
740 | ret = -ENAMETOOLONG; | |
45222b9e | 741 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
742 | goto error; |
743 | ||
744 | key = afs_request_key(dvnode->volume->cell); | |
745 | if (IS_ERR(key)) { | |
746 | ret = PTR_ERR(key); | |
747 | goto error; | |
748 | } | |
749 | ||
750 | mode |= S_IFDIR; | |
751 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
752 | mode, &fid, &status, &cb, &server); | |
753 | if (ret < 0) | |
754 | goto mkdir_error; | |
755 | ||
756 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
757 | if (IS_ERR(inode)) { | |
758 | /* ENOMEM at a really inconvenient time - just abandon the new | |
759 | * directory on the server */ | |
760 | ret = PTR_ERR(inode); | |
761 | goto iget_error; | |
762 | } | |
763 | ||
764 | /* apply the status report we've got for the new vnode */ | |
765 | vnode = AFS_FS_I(inode); | |
766 | spin_lock(&vnode->lock); | |
767 | vnode->update_cnt++; | |
768 | spin_unlock(&vnode->lock); | |
769 | afs_vnode_finalise_status_update(vnode, server); | |
770 | afs_put_server(server); | |
771 | ||
772 | d_instantiate(dentry, inode); | |
773 | if (d_unhashed(dentry)) { | |
774 | _debug("not hashed"); | |
775 | d_rehash(dentry); | |
776 | } | |
777 | key_put(key); | |
778 | _leave(" = 0"); | |
779 | return 0; | |
780 | ||
781 | iget_error: | |
782 | afs_put_server(server); | |
783 | mkdir_error: | |
784 | key_put(key); | |
785 | error: | |
786 | d_drop(dentry); | |
787 | _leave(" = %d", ret); | |
788 | return ret; | |
789 | } | |
790 | ||
791 | /* | |
792 | * remove a directory from an AFS filesystem | |
793 | */ | |
794 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
795 | { | |
796 | struct afs_vnode *dvnode, *vnode; | |
797 | struct key *key; | |
798 | int ret; | |
799 | ||
800 | dvnode = AFS_FS_I(dir); | |
801 | ||
416351f2 | 802 | _enter("{%x:%u},{%s}", |
260a9803 DH |
803 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
804 | ||
805 | ret = -ENAMETOOLONG; | |
45222b9e | 806 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
807 | goto error; |
808 | ||
809 | key = afs_request_key(dvnode->volume->cell); | |
810 | if (IS_ERR(key)) { | |
811 | ret = PTR_ERR(key); | |
812 | goto error; | |
813 | } | |
814 | ||
815 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); | |
816 | if (ret < 0) | |
817 | goto rmdir_error; | |
818 | ||
819 | if (dentry->d_inode) { | |
820 | vnode = AFS_FS_I(dentry->d_inode); | |
821 | clear_nlink(&vnode->vfs_inode); | |
822 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
823 | afs_discard_callback_on_delete(vnode); | |
824 | } | |
825 | ||
826 | key_put(key); | |
827 | _leave(" = 0"); | |
828 | return 0; | |
829 | ||
830 | rmdir_error: | |
831 | key_put(key); | |
832 | error: | |
833 | _leave(" = %d", ret); | |
834 | return ret; | |
835 | } | |
836 | ||
837 | /* | |
838 | * remove a file from an AFS filesystem | |
839 | */ | |
840 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
841 | { | |
842 | struct afs_vnode *dvnode, *vnode; | |
843 | struct key *key; | |
844 | int ret; | |
845 | ||
846 | dvnode = AFS_FS_I(dir); | |
847 | ||
416351f2 | 848 | _enter("{%x:%u},{%s}", |
260a9803 DH |
849 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
850 | ||
851 | ret = -ENAMETOOLONG; | |
45222b9e | 852 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
853 | goto error; |
854 | ||
855 | key = afs_request_key(dvnode->volume->cell); | |
856 | if (IS_ERR(key)) { | |
857 | ret = PTR_ERR(key); | |
858 | goto error; | |
859 | } | |
860 | ||
861 | if (dentry->d_inode) { | |
862 | vnode = AFS_FS_I(dentry->d_inode); | |
863 | ||
864 | /* make sure we have a callback promise on the victim */ | |
865 | ret = afs_validate(vnode, key); | |
866 | if (ret < 0) | |
867 | goto error; | |
868 | } | |
869 | ||
870 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); | |
871 | if (ret < 0) | |
872 | goto remove_error; | |
873 | ||
874 | if (dentry->d_inode) { | |
875 | /* if the file wasn't deleted due to excess hard links, the | |
876 | * fileserver will break the callback promise on the file - if | |
877 | * it had one - before it returns to us, and if it was deleted, | |
878 | * it won't | |
879 | * | |
880 | * however, if we didn't have a callback promise outstanding, | |
881 | * or it was outstanding on a different server, then it won't | |
882 | * break it either... | |
883 | */ | |
884 | vnode = AFS_FS_I(dentry->d_inode); | |
885 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
886 | _debug("AFS_VNODE_DELETED"); | |
887 | if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) | |
888 | _debug("AFS_VNODE_CB_BROKEN"); | |
889 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
890 | ret = afs_validate(vnode, key); | |
891 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
892 | } | |
893 | ||
894 | key_put(key); | |
895 | _leave(" = 0"); | |
896 | return 0; | |
897 | ||
898 | remove_error: | |
899 | key_put(key); | |
900 | error: | |
901 | _leave(" = %d", ret); | |
902 | return ret; | |
903 | } | |
904 | ||
905 | /* | |
906 | * create a regular file on an AFS filesystem | |
907 | */ | |
908 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, | |
909 | struct nameidata *nd) | |
910 | { | |
911 | struct afs_file_status status; | |
912 | struct afs_callback cb; | |
913 | struct afs_server *server; | |
914 | struct afs_vnode *dvnode, *vnode; | |
915 | struct afs_fid fid; | |
916 | struct inode *inode; | |
917 | struct key *key; | |
918 | int ret; | |
919 | ||
920 | dvnode = AFS_FS_I(dir); | |
921 | ||
416351f2 | 922 | _enter("{%x:%u},{%s},%o,", |
260a9803 DH |
923 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
924 | ||
925 | ret = -ENAMETOOLONG; | |
45222b9e | 926 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
927 | goto error; |
928 | ||
929 | key = afs_request_key(dvnode->volume->cell); | |
930 | if (IS_ERR(key)) { | |
931 | ret = PTR_ERR(key); | |
932 | goto error; | |
933 | } | |
934 | ||
935 | mode |= S_IFREG; | |
936 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
937 | mode, &fid, &status, &cb, &server); | |
938 | if (ret < 0) | |
939 | goto create_error; | |
940 | ||
941 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
942 | if (IS_ERR(inode)) { | |
943 | /* ENOMEM at a really inconvenient time - just abandon the new | |
944 | * directory on the server */ | |
945 | ret = PTR_ERR(inode); | |
946 | goto iget_error; | |
947 | } | |
948 | ||
949 | /* apply the status report we've got for the new vnode */ | |
950 | vnode = AFS_FS_I(inode); | |
951 | spin_lock(&vnode->lock); | |
952 | vnode->update_cnt++; | |
953 | spin_unlock(&vnode->lock); | |
954 | afs_vnode_finalise_status_update(vnode, server); | |
955 | afs_put_server(server); | |
956 | ||
957 | d_instantiate(dentry, inode); | |
958 | if (d_unhashed(dentry)) { | |
959 | _debug("not hashed"); | |
960 | d_rehash(dentry); | |
961 | } | |
962 | key_put(key); | |
963 | _leave(" = 0"); | |
964 | return 0; | |
965 | ||
966 | iget_error: | |
967 | afs_put_server(server); | |
968 | create_error: | |
969 | key_put(key); | |
970 | error: | |
971 | d_drop(dentry); | |
972 | _leave(" = %d", ret); | |
973 | return ret; | |
974 | } | |
975 | ||
976 | /* | |
977 | * create a hard link between files in an AFS filesystem | |
978 | */ | |
979 | static int afs_link(struct dentry *from, struct inode *dir, | |
980 | struct dentry *dentry) | |
981 | { | |
982 | struct afs_vnode *dvnode, *vnode; | |
983 | struct key *key; | |
984 | int ret; | |
985 | ||
986 | vnode = AFS_FS_I(from->d_inode); | |
987 | dvnode = AFS_FS_I(dir); | |
988 | ||
416351f2 | 989 | _enter("{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
990 | vnode->fid.vid, vnode->fid.vnode, |
991 | dvnode->fid.vid, dvnode->fid.vnode, | |
992 | dentry->d_name.name); | |
993 | ||
994 | ret = -ENAMETOOLONG; | |
45222b9e | 995 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
996 | goto error; |
997 | ||
998 | key = afs_request_key(dvnode->volume->cell); | |
999 | if (IS_ERR(key)) { | |
1000 | ret = PTR_ERR(key); | |
1001 | goto error; | |
1002 | } | |
1003 | ||
1004 | ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); | |
1005 | if (ret < 0) | |
1006 | goto link_error; | |
1007 | ||
1008 | atomic_inc(&vnode->vfs_inode.i_count); | |
1009 | d_instantiate(dentry, &vnode->vfs_inode); | |
1010 | key_put(key); | |
1011 | _leave(" = 0"); | |
1012 | return 0; | |
1013 | ||
1014 | link_error: | |
1015 | key_put(key); | |
1016 | error: | |
1017 | d_drop(dentry); | |
1018 | _leave(" = %d", ret); | |
1019 | return ret; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * create a symlink in an AFS filesystem | |
1024 | */ | |
1025 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1026 | const char *content) | |
1027 | { | |
1028 | struct afs_file_status status; | |
1029 | struct afs_server *server; | |
1030 | struct afs_vnode *dvnode, *vnode; | |
1031 | struct afs_fid fid; | |
1032 | struct inode *inode; | |
1033 | struct key *key; | |
1034 | int ret; | |
1035 | ||
1036 | dvnode = AFS_FS_I(dir); | |
1037 | ||
416351f2 | 1038 | _enter("{%x:%u},{%s},%s", |
260a9803 DH |
1039 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, |
1040 | content); | |
1041 | ||
1042 | ret = -ENAMETOOLONG; | |
45222b9e | 1043 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1044 | goto error; |
1045 | ||
1046 | ret = -EINVAL; | |
45222b9e | 1047 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
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 = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, | |
1057 | &fid, &status, &server); | |
1058 | if (ret < 0) | |
1059 | goto create_error; | |
1060 | ||
1061 | inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); | |
1062 | if (IS_ERR(inode)) { | |
1063 | /* ENOMEM at a really inconvenient time - just abandon the new | |
1064 | * directory on the server */ | |
1065 | ret = PTR_ERR(inode); | |
1066 | goto iget_error; | |
1067 | } | |
1068 | ||
1069 | /* apply the status report we've got for the new vnode */ | |
1070 | vnode = AFS_FS_I(inode); | |
1071 | spin_lock(&vnode->lock); | |
1072 | vnode->update_cnt++; | |
1073 | spin_unlock(&vnode->lock); | |
1074 | afs_vnode_finalise_status_update(vnode, server); | |
1075 | afs_put_server(server); | |
1076 | ||
1077 | d_instantiate(dentry, inode); | |
1078 | if (d_unhashed(dentry)) { | |
1079 | _debug("not hashed"); | |
1080 | d_rehash(dentry); | |
1081 | } | |
1082 | key_put(key); | |
1083 | _leave(" = 0"); | |
1084 | return 0; | |
1085 | ||
1086 | iget_error: | |
1087 | afs_put_server(server); | |
1088 | create_error: | |
1089 | key_put(key); | |
1090 | error: | |
1091 | d_drop(dentry); | |
1092 | _leave(" = %d", ret); | |
1093 | return ret; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * rename a file in an AFS filesystem and/or move it between directories | |
1098 | */ | |
1099 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1100 | struct inode *new_dir, struct dentry *new_dentry) | |
1101 | { | |
1102 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; | |
1103 | struct key *key; | |
1104 | int ret; | |
1105 | ||
1106 | vnode = AFS_FS_I(old_dentry->d_inode); | |
1107 | orig_dvnode = AFS_FS_I(old_dir); | |
1108 | new_dvnode = AFS_FS_I(new_dir); | |
1109 | ||
416351f2 | 1110 | _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
1111 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1112 | vnode->fid.vid, vnode->fid.vnode, | |
1113 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
1114 | new_dentry->d_name.name); | |
1115 | ||
1116 | ret = -ENAMETOOLONG; | |
45222b9e | 1117 | if (new_dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1118 | goto error; |
1119 | ||
1120 | key = afs_request_key(orig_dvnode->volume->cell); | |
1121 | if (IS_ERR(key)) { | |
1122 | ret = PTR_ERR(key); | |
1123 | goto error; | |
1124 | } | |
1125 | ||
1126 | ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, | |
1127 | old_dentry->d_name.name, | |
1128 | new_dentry->d_name.name); | |
1129 | if (ret < 0) | |
1130 | goto rename_error; | |
1131 | key_put(key); | |
1132 | _leave(" = 0"); | |
1133 | return 0; | |
1134 | ||
1135 | rename_error: | |
1136 | key_put(key); | |
1137 | error: | |
1138 | d_drop(new_dentry); | |
1139 | _leave(" = %d", ret); | |
1140 | return ret; | |
1141 | } |