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, |
3222a3e5 | 48 | .llseek = generic_file_llseek, |
1da177e4 LT |
49 | }; |
50 | ||
754661f1 | 51 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
52 | .create = afs_create, |
53 | .lookup = afs_lookup, | |
54 | .link = afs_link, | |
55 | .unlink = afs_unlink, | |
56 | .symlink = afs_symlink, | |
57 | .mkdir = afs_mkdir, | |
58 | .rmdir = afs_rmdir, | |
59 | .rename = afs_rename, | |
00d3b7a4 | 60 | .permission = afs_permission, |
416351f2 | 61 | .getattr = afs_getattr, |
31143d5d | 62 | .setattr = afs_setattr, |
1da177e4 LT |
63 | }; |
64 | ||
65 | static struct dentry_operations afs_fs_dentry_operations = { | |
66 | .d_revalidate = afs_d_revalidate, | |
67 | .d_delete = afs_d_delete, | |
260a9803 | 68 | .d_release = afs_d_release, |
1da177e4 LT |
69 | }; |
70 | ||
71 | #define AFS_DIR_HASHTBL_SIZE 128 | |
72 | #define AFS_DIR_DIRENT_SIZE 32 | |
73 | #define AFS_DIRENT_PER_BLOCK 64 | |
74 | ||
75 | union afs_dirent { | |
76 | struct { | |
77 | uint8_t valid; | |
78 | uint8_t unused[1]; | |
79 | __be16 hash_next; | |
80 | __be32 vnode; | |
81 | __be32 unique; | |
82 | uint8_t name[16]; | |
83 | uint8_t overflow[4]; /* if any char of the name (inc | |
84 | * NUL) reaches here, consume | |
85 | * the next dirent too */ | |
86 | } u; | |
87 | uint8_t extended_name[32]; | |
88 | }; | |
89 | ||
90 | /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ | |
91 | struct afs_dir_pagehdr { | |
92 | __be16 npages; | |
93 | __be16 magic; | |
94 | #define AFS_DIR_MAGIC htons(1234) | |
95 | uint8_t nentries; | |
96 | uint8_t bitmap[8]; | |
97 | uint8_t pad[19]; | |
98 | }; | |
99 | ||
100 | /* directory block layout */ | |
101 | union afs_dir_block { | |
102 | ||
103 | struct afs_dir_pagehdr pagehdr; | |
104 | ||
105 | struct { | |
106 | struct afs_dir_pagehdr pagehdr; | |
107 | uint8_t alloc_ctrs[128]; | |
108 | /* dir hash table */ | |
109 | uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; | |
110 | } hdr; | |
111 | ||
112 | union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; | |
113 | }; | |
114 | ||
115 | /* layout on a linux VM page */ | |
116 | struct afs_dir_page { | |
117 | union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; | |
118 | }; | |
119 | ||
260a9803 | 120 | struct afs_lookup_cookie { |
1da177e4 LT |
121 | struct afs_fid fid; |
122 | const char *name; | |
123 | size_t nlen; | |
124 | int found; | |
125 | }; | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * check that a directory page is valid | |
129 | */ | |
130 | static inline void afs_dir_check_page(struct inode *dir, struct page *page) | |
131 | { | |
132 | struct afs_dir_page *dbuf; | |
133 | loff_t latter; | |
134 | int tmp, qty; | |
135 | ||
136 | #if 0 | |
137 | /* check the page count */ | |
138 | qty = desc.size / sizeof(dbuf->blocks[0]); | |
139 | if (qty == 0) | |
140 | goto error; | |
141 | ||
08e0e7c8 | 142 | if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
1da177e4 | 143 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
530b6412 | 144 | __func__, dir->i_ino, qty, |
08e0e7c8 | 145 | ntohs(dbuf->blocks[0].pagehdr.npages)); |
1da177e4 LT |
146 | goto error; |
147 | } | |
148 | #endif | |
149 | ||
150 | /* determine how many magic numbers there should be in this page */ | |
54b21a79 | 151 | latter = dir->i_size - page_offset(page); |
1da177e4 LT |
152 | if (latter >= PAGE_SIZE) |
153 | qty = PAGE_SIZE; | |
154 | else | |
155 | qty = latter; | |
156 | qty /= sizeof(union afs_dir_block); | |
157 | ||
158 | /* check them */ | |
159 | dbuf = page_address(page); | |
160 | for (tmp = 0; tmp < qty; tmp++) { | |
161 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
162 | printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", | |
530b6412 | 163 | __func__, dir->i_ino, tmp, qty, |
1da177e4 LT |
164 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
165 | goto error; | |
166 | } | |
167 | } | |
168 | ||
169 | SetPageChecked(page); | |
170 | return; | |
171 | ||
ec26815a | 172 | error: |
1da177e4 LT |
173 | SetPageChecked(page); |
174 | SetPageError(page); | |
ec26815a | 175 | } |
1da177e4 | 176 | |
1da177e4 LT |
177 | /* |
178 | * discard a page cached in the pagecache | |
179 | */ | |
180 | static inline void afs_dir_put_page(struct page *page) | |
181 | { | |
182 | kunmap(page); | |
183 | page_cache_release(page); | |
ec26815a | 184 | } |
1da177e4 | 185 | |
1da177e4 LT |
186 | /* |
187 | * get a page into the pagecache | |
188 | */ | |
00d3b7a4 DH |
189 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
190 | struct key *key) | |
1da177e4 LT |
191 | { |
192 | struct page *page; | |
00d3b7a4 DH |
193 | struct file file = { |
194 | .private_data = key, | |
195 | }; | |
1da177e4 LT |
196 | |
197 | _enter("{%lu},%lu", dir->i_ino, index); | |
198 | ||
00d3b7a4 | 199 | page = read_mapping_page(dir->i_mapping, index, &file); |
1da177e4 | 200 | if (!IS_ERR(page)) { |
1da177e4 | 201 | kmap(page); |
1da177e4 LT |
202 | if (!PageChecked(page)) |
203 | afs_dir_check_page(dir, page); | |
204 | if (PageError(page)) | |
205 | goto fail; | |
206 | } | |
207 | return page; | |
208 | ||
ec26815a | 209 | fail: |
1da177e4 | 210 | afs_dir_put_page(page); |
08e0e7c8 | 211 | _leave(" = -EIO"); |
1da177e4 | 212 | return ERR_PTR(-EIO); |
ec26815a | 213 | } |
1da177e4 | 214 | |
1da177e4 LT |
215 | /* |
216 | * open an AFS directory file | |
217 | */ | |
218 | static int afs_dir_open(struct inode *inode, struct file *file) | |
219 | { | |
220 | _enter("{%lu}", inode->i_ino); | |
221 | ||
2ecd05ae AD |
222 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
223 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 224 | |
08e0e7c8 | 225 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
226 | return -ENOENT; |
227 | ||
00d3b7a4 | 228 | return afs_open(inode, file); |
ec26815a | 229 | } |
1da177e4 | 230 | |
1da177e4 LT |
231 | /* |
232 | * deal with one block in an AFS directory | |
233 | */ | |
234 | static int afs_dir_iterate_block(unsigned *fpos, | |
235 | union afs_dir_block *block, | |
236 | unsigned blkoff, | |
237 | void *cookie, | |
238 | filldir_t filldir) | |
239 | { | |
240 | union afs_dirent *dire; | |
241 | unsigned offset, next, curr; | |
242 | size_t nlen; | |
243 | int tmp, ret; | |
244 | ||
245 | _enter("%u,%x,%p,,",*fpos,blkoff,block); | |
246 | ||
247 | curr = (*fpos - blkoff) / sizeof(union afs_dirent); | |
248 | ||
249 | /* walk through the block, an entry at a time */ | |
250 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
251 | offset < AFS_DIRENT_PER_BLOCK; | |
252 | offset = next | |
253 | ) { | |
254 | next = offset + 1; | |
255 | ||
256 | /* skip entries marked unused in the bitmap */ | |
257 | if (!(block->pagehdr.bitmap[offset / 8] & | |
258 | (1 << (offset % 8)))) { | |
08e0e7c8 | 259 | _debug("ENT[%Zu.%u]: unused", |
1da177e4 LT |
260 | blkoff / sizeof(union afs_dir_block), offset); |
261 | if (offset >= curr) | |
262 | *fpos = blkoff + | |
263 | next * sizeof(union afs_dirent); | |
264 | continue; | |
265 | } | |
266 | ||
267 | /* got a valid entry */ | |
268 | dire = &block->dirents[offset]; | |
269 | nlen = strnlen(dire->u.name, | |
270 | sizeof(*block) - | |
271 | offset * sizeof(union afs_dirent)); | |
272 | ||
08e0e7c8 | 273 | _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
1da177e4 LT |
274 | blkoff / sizeof(union afs_dir_block), offset, |
275 | (offset < curr ? "skip" : "fill"), | |
276 | nlen, dire->u.name); | |
277 | ||
278 | /* work out where the next possible entry is */ | |
279 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
280 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
281 | _debug("ENT[%Zu.%u]:" | |
282 | " %u travelled beyond end dir block" | |
08e0e7c8 | 283 | " (len %u/%Zu)", |
1da177e4 LT |
284 | blkoff / sizeof(union afs_dir_block), |
285 | offset, next, tmp, nlen); | |
286 | return -EIO; | |
287 | } | |
288 | if (!(block->pagehdr.bitmap[next / 8] & | |
289 | (1 << (next % 8)))) { | |
290 | _debug("ENT[%Zu.%u]:" | |
08e0e7c8 | 291 | " %u unmarked extension (len %u/%Zu)", |
1da177e4 LT |
292 | blkoff / sizeof(union afs_dir_block), |
293 | offset, next, tmp, nlen); | |
294 | return -EIO; | |
295 | } | |
296 | ||
08e0e7c8 | 297 | _debug("ENT[%Zu.%u]: ext %u/%Zu", |
1da177e4 LT |
298 | blkoff / sizeof(union afs_dir_block), |
299 | next, tmp, nlen); | |
300 | next++; | |
301 | } | |
302 | ||
303 | /* skip if starts before the current position */ | |
304 | if (offset < curr) | |
305 | continue; | |
306 | ||
307 | /* found the next entry */ | |
308 | ret = filldir(cookie, | |
309 | dire->u.name, | |
310 | nlen, | |
311 | blkoff + offset * sizeof(union afs_dirent), | |
312 | ntohl(dire->u.vnode), | |
260a9803 | 313 | filldir == afs_lookup_filldir ? |
1da177e4 LT |
314 | ntohl(dire->u.unique) : DT_UNKNOWN); |
315 | if (ret < 0) { | |
316 | _leave(" = 0 [full]"); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | *fpos = blkoff + next * sizeof(union afs_dirent); | |
321 | } | |
322 | ||
323 | _leave(" = 1 [more]"); | |
324 | return 1; | |
ec26815a | 325 | } |
1da177e4 | 326 | |
1da177e4 | 327 | /* |
08e0e7c8 | 328 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 LT |
329 | */ |
330 | static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, | |
00d3b7a4 | 331 | filldir_t filldir, struct key *key) |
1da177e4 | 332 | { |
08e0e7c8 | 333 | union afs_dir_block *dblock; |
1da177e4 LT |
334 | struct afs_dir_page *dbuf; |
335 | struct page *page; | |
336 | unsigned blkoff, limit; | |
337 | int ret; | |
338 | ||
339 | _enter("{%lu},%u,,", dir->i_ino, *fpos); | |
340 | ||
08e0e7c8 | 341 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
342 | _leave(" = -ESTALE"); |
343 | return -ESTALE; | |
344 | } | |
345 | ||
346 | /* round the file position up to the next entry boundary */ | |
347 | *fpos += sizeof(union afs_dirent) - 1; | |
348 | *fpos &= ~(sizeof(union afs_dirent) - 1); | |
349 | ||
350 | /* walk through the blocks in sequence */ | |
351 | ret = 0; | |
352 | while (*fpos < dir->i_size) { | |
353 | blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); | |
354 | ||
355 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 356 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
357 | if (IS_ERR(page)) { |
358 | ret = PTR_ERR(page); | |
359 | break; | |
360 | } | |
361 | ||
362 | limit = blkoff & ~(PAGE_SIZE - 1); | |
363 | ||
364 | dbuf = page_address(page); | |
365 | ||
366 | /* deal with the individual blocks stashed on this page */ | |
367 | do { | |
368 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
369 | sizeof(union afs_dir_block)]; | |
370 | ret = afs_dir_iterate_block(fpos, dblock, blkoff, | |
371 | cookie, filldir); | |
372 | if (ret != 1) { | |
373 | afs_dir_put_page(page); | |
374 | goto out; | |
375 | } | |
376 | ||
377 | blkoff += sizeof(union afs_dir_block); | |
378 | ||
379 | } while (*fpos < dir->i_size && blkoff < limit); | |
380 | ||
381 | afs_dir_put_page(page); | |
382 | ret = 0; | |
383 | } | |
384 | ||
ec26815a | 385 | out: |
1da177e4 LT |
386 | _leave(" = %d", ret); |
387 | return ret; | |
ec26815a | 388 | } |
1da177e4 | 389 | |
1da177e4 LT |
390 | /* |
391 | * read an AFS directory | |
392 | */ | |
260a9803 | 393 | static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) |
1da177e4 LT |
394 | { |
395 | unsigned fpos; | |
396 | int ret; | |
397 | ||
08e0e7c8 DH |
398 | _enter("{%Ld,{%lu}}", |
399 | file->f_pos, file->f_path.dentry->d_inode->i_ino); | |
1da177e4 | 400 | |
00d3b7a4 DH |
401 | ASSERT(file->private_data != NULL); |
402 | ||
1da177e4 | 403 | fpos = file->f_pos; |
08e0e7c8 | 404 | ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, |
00d3b7a4 | 405 | cookie, filldir, file->private_data); |
1da177e4 LT |
406 | file->f_pos = fpos; |
407 | ||
408 | _leave(" = %d", ret); | |
409 | return ret; | |
ec26815a | 410 | } |
1da177e4 | 411 | |
1da177e4 LT |
412 | /* |
413 | * search the directory for a name | |
414 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
415 | * uniquifier through dtype | |
416 | */ | |
260a9803 DH |
417 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, |
418 | loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 419 | { |
260a9803 | 420 | struct afs_lookup_cookie *cookie = _cookie; |
1da177e4 | 421 | |
08e0e7c8 | 422 | _enter("{%s,%Zu},%s,%u,,%llu,%u", |
ba3e0e1a DM |
423 | cookie->name, cookie->nlen, name, nlen, |
424 | (unsigned long long) ino, dtype); | |
1da177e4 | 425 | |
08e0e7c8 DH |
426 | /* insanity checks first */ |
427 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
428 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
429 | ||
1da177e4 LT |
430 | if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { |
431 | _leave(" = 0 [no]"); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | cookie->fid.vnode = ino; | |
436 | cookie->fid.unique = dtype; | |
437 | cookie->found = 1; | |
438 | ||
439 | _leave(" = -1 [found]"); | |
440 | return -1; | |
ec26815a | 441 | } |
1da177e4 | 442 | |
1da177e4 | 443 | /* |
08e0e7c8 | 444 | * do a lookup in a directory |
260a9803 | 445 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 446 | */ |
08e0e7c8 | 447 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 448 | struct afs_fid *fid, struct key *key) |
1da177e4 | 449 | { |
260a9803 | 450 | struct afs_lookup_cookie cookie; |
1da177e4 | 451 | struct afs_super_info *as; |
1da177e4 LT |
452 | unsigned fpos; |
453 | int ret; | |
454 | ||
08e0e7c8 | 455 | _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); |
1da177e4 LT |
456 | |
457 | as = dir->i_sb->s_fs_info; | |
458 | ||
459 | /* search the directory */ | |
460 | cookie.name = dentry->d_name.name; | |
461 | cookie.nlen = dentry->d_name.len; | |
462 | cookie.fid.vid = as->volume->vid; | |
463 | cookie.found = 0; | |
464 | ||
465 | fpos = 0; | |
260a9803 | 466 | ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, |
00d3b7a4 | 467 | key); |
1da177e4 | 468 | if (ret < 0) { |
08e0e7c8 DH |
469 | _leave(" = %d [iter]", ret); |
470 | return ret; | |
1da177e4 LT |
471 | } |
472 | ||
473 | ret = -ENOENT; | |
474 | if (!cookie.found) { | |
08e0e7c8 DH |
475 | _leave(" = -ENOENT [not found]"); |
476 | return -ENOENT; | |
1da177e4 LT |
477 | } |
478 | ||
08e0e7c8 DH |
479 | *fid = cookie.fid; |
480 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | /* | |
485 | * look up an entry in a directory | |
486 | */ | |
260a9803 DH |
487 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
488 | struct nameidata *nd) | |
08e0e7c8 DH |
489 | { |
490 | struct afs_vnode *vnode; | |
491 | struct afs_fid fid; | |
492 | struct inode *inode; | |
00d3b7a4 | 493 | struct key *key; |
08e0e7c8 DH |
494 | int ret; |
495 | ||
260a9803 DH |
496 | vnode = AFS_FS_I(dir); |
497 | ||
416351f2 | 498 | _enter("{%x:%u},%p{%s},", |
260a9803 DH |
499 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); |
500 | ||
501 | ASSERTCMP(dentry->d_inode, ==, NULL); | |
08e0e7c8 | 502 | |
45222b9e | 503 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
504 | _leave(" = -ENAMETOOLONG"); |
505 | return ERR_PTR(-ENAMETOOLONG); | |
506 | } | |
507 | ||
08e0e7c8 DH |
508 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
509 | _leave(" = -ESTALE"); | |
510 | return ERR_PTR(-ESTALE); | |
511 | } | |
512 | ||
00d3b7a4 DH |
513 | key = afs_request_key(vnode->volume->cell); |
514 | if (IS_ERR(key)) { | |
515 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 516 | return ERR_CAST(key); |
00d3b7a4 DH |
517 | } |
518 | ||
260a9803 DH |
519 | ret = afs_validate(vnode, key); |
520 | if (ret < 0) { | |
521 | key_put(key); | |
522 | _leave(" = %d [val]", ret); | |
523 | return ERR_PTR(ret); | |
524 | } | |
525 | ||
00d3b7a4 | 526 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 527 | if (ret < 0) { |
00d3b7a4 | 528 | key_put(key); |
260a9803 DH |
529 | if (ret == -ENOENT) { |
530 | d_add(dentry, NULL); | |
531 | _leave(" = NULL [negative]"); | |
532 | return NULL; | |
533 | } | |
08e0e7c8 | 534 | _leave(" = %d [do]", ret); |
1da177e4 LT |
535 | return ERR_PTR(ret); |
536 | } | |
260a9803 | 537 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 538 | |
08e0e7c8 | 539 | /* instantiate the dentry */ |
260a9803 | 540 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
00d3b7a4 | 541 | key_put(key); |
08e0e7c8 DH |
542 | if (IS_ERR(inode)) { |
543 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 544 | return ERR_CAST(inode); |
08e0e7c8 DH |
545 | } |
546 | ||
1da177e4 | 547 | dentry->d_op = &afs_fs_dentry_operations; |
1da177e4 LT |
548 | |
549 | d_add(dentry, inode); | |
7a224228 | 550 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", |
08e0e7c8 DH |
551 | fid.vnode, |
552 | fid.unique, | |
1da177e4 | 553 | dentry->d_inode->i_ino, |
7a224228 | 554 | (unsigned long long)dentry->d_inode->i_version); |
1da177e4 LT |
555 | |
556 | return NULL; | |
ec26815a | 557 | } |
1da177e4 | 558 | |
1da177e4 LT |
559 | /* |
560 | * check that a dentry lookup hit has found a valid entry | |
561 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
562 | * inode | |
1da177e4 LT |
563 | */ |
564 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
565 | { | |
260a9803 | 566 | struct afs_vnode *vnode, *dir; |
08e0e7c8 | 567 | struct afs_fid fid; |
1da177e4 | 568 | struct dentry *parent; |
00d3b7a4 | 569 | struct key *key; |
260a9803 | 570 | void *dir_version; |
1da177e4 LT |
571 | int ret; |
572 | ||
08e0e7c8 DH |
573 | vnode = AFS_FS_I(dentry->d_inode); |
574 | ||
260a9803 DH |
575 | if (dentry->d_inode) |
576 | _enter("{v={%x:%u} n=%s fl=%lx},", | |
577 | vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, | |
578 | vnode->flags); | |
579 | else | |
580 | _enter("{neg n=%s}", dentry->d_name.name); | |
1da177e4 | 581 | |
260a9803 | 582 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
583 | if (IS_ERR(key)) |
584 | key = NULL; | |
585 | ||
1da177e4 | 586 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 587 | parent = dget_parent(dentry); |
260a9803 | 588 | if (!parent->d_inode) |
1da177e4 LT |
589 | goto out_bad; |
590 | ||
260a9803 | 591 | dir = AFS_FS_I(parent->d_inode); |
1da177e4 | 592 | |
260a9803 DH |
593 | /* validate the parent directory */ |
594 | if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) | |
595 | afs_validate(dir, key); | |
596 | ||
597 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
1da177e4 LT |
598 | _debug("%s: parent dir deleted", dentry->d_name.name); |
599 | goto out_bad; | |
600 | } | |
601 | ||
260a9803 DH |
602 | dir_version = (void *) (unsigned long) dir->status.data_version; |
603 | if (dentry->d_fsdata == dir_version) | |
604 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 605 | |
260a9803 DH |
606 | _debug("dir modified"); |
607 | ||
608 | /* search the directory for this vnode */ | |
609 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
610 | switch (ret) { | |
611 | case 0: | |
612 | /* the filename maps to something */ | |
613 | if (!dentry->d_inode) | |
614 | goto out_bad; | |
615 | if (is_bad_inode(dentry->d_inode)) { | |
616 | printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", | |
617 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
618 | goto out_bad; |
619 | } | |
620 | ||
1da177e4 LT |
621 | /* if the vnode ID has changed, then the dirent points to a |
622 | * different file */ | |
08e0e7c8 DH |
623 | if (fid.vnode != vnode->fid.vnode) { |
624 | _debug("%s: dirent changed [%u != %u]", | |
625 | dentry->d_name.name, fid.vnode, | |
626 | vnode->fid.vnode); | |
1da177e4 LT |
627 | goto not_found; |
628 | } | |
629 | ||
630 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
631 | * been deleted and replaced, and the original vnode ID has |
632 | * been reused */ | |
08e0e7c8 | 633 | if (fid.unique != vnode->fid.unique) { |
7a224228 | 634 | _debug("%s: file deleted (uq %u -> %u I:%llu)", |
08e0e7c8 | 635 | dentry->d_name.name, fid.unique, |
7a224228 JNC |
636 | vnode->fid.unique, |
637 | (unsigned long long)dentry->d_inode->i_version); | |
08e0e7c8 DH |
638 | spin_lock(&vnode->lock); |
639 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
640 | spin_unlock(&vnode->lock); | |
260a9803 | 641 | goto not_found; |
1da177e4 | 642 | } |
260a9803 | 643 | goto out_valid; |
08e0e7c8 | 644 | |
260a9803 DH |
645 | case -ENOENT: |
646 | /* the filename is unknown */ | |
647 | _debug("%s: dirent not found", dentry->d_name.name); | |
648 | if (dentry->d_inode) | |
649 | goto not_found; | |
650 | goto out_valid; | |
1da177e4 | 651 | |
260a9803 DH |
652 | default: |
653 | _debug("failed to iterate dir %s: %d", | |
654 | parent->d_name.name, ret); | |
08e0e7c8 DH |
655 | goto out_bad; |
656 | } | |
657 | ||
ec26815a | 658 | out_valid: |
260a9803 DH |
659 | dentry->d_fsdata = dir_version; |
660 | out_skip: | |
1da177e4 | 661 | dput(parent); |
00d3b7a4 | 662 | key_put(key); |
1da177e4 LT |
663 | _leave(" = 1 [valid]"); |
664 | return 1; | |
665 | ||
666 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 667 | not_found: |
1da177e4 LT |
668 | spin_lock(&dentry->d_lock); |
669 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
670 | spin_unlock(&dentry->d_lock); | |
671 | ||
ec26815a | 672 | out_bad: |
260a9803 | 673 | if (dentry->d_inode) { |
1da177e4 LT |
674 | /* don't unhash if we have submounts */ |
675 | if (have_submounts(dentry)) | |
260a9803 | 676 | goto out_skip; |
1da177e4 LT |
677 | } |
678 | ||
1da177e4 | 679 | _debug("dropping dentry %s/%s", |
08e0e7c8 DH |
680 | parent->d_name.name, dentry->d_name.name); |
681 | shrink_dcache_parent(dentry); | |
1da177e4 | 682 | d_drop(dentry); |
1da177e4 | 683 | dput(parent); |
00d3b7a4 | 684 | key_put(key); |
1da177e4 LT |
685 | |
686 | _leave(" = 0 [bad]"); | |
687 | return 0; | |
ec26815a | 688 | } |
1da177e4 | 689 | |
1da177e4 LT |
690 | /* |
691 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
692 | * sleep) | |
693 | * - called from dput() when d_count is going to 0. | |
694 | * - return 1 to request dentry be unhashed, 0 otherwise | |
695 | */ | |
696 | static int afs_d_delete(struct dentry *dentry) | |
697 | { | |
698 | _enter("%s", dentry->d_name.name); | |
699 | ||
700 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
701 | goto zap; | |
702 | ||
08e0e7c8 DH |
703 | if (dentry->d_inode && |
704 | test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) | |
1da177e4 | 705 | goto zap; |
1da177e4 LT |
706 | |
707 | _leave(" = 0 [keep]"); | |
708 | return 0; | |
709 | ||
ec26815a | 710 | zap: |
1da177e4 LT |
711 | _leave(" = 1 [zap]"); |
712 | return 1; | |
ec26815a | 713 | } |
260a9803 DH |
714 | |
715 | /* | |
716 | * handle dentry release | |
717 | */ | |
718 | static void afs_d_release(struct dentry *dentry) | |
719 | { | |
720 | _enter("%s", dentry->d_name.name); | |
721 | } | |
722 | ||
723 | /* | |
724 | * create a directory on an AFS filesystem | |
725 | */ | |
726 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
727 | { | |
728 | struct afs_file_status status; | |
729 | struct afs_callback cb; | |
730 | struct afs_server *server; | |
731 | struct afs_vnode *dvnode, *vnode; | |
732 | struct afs_fid fid; | |
733 | struct inode *inode; | |
734 | struct key *key; | |
735 | int ret; | |
736 | ||
737 | dvnode = AFS_FS_I(dir); | |
738 | ||
416351f2 | 739 | _enter("{%x:%u},{%s},%o", |
260a9803 DH |
740 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
741 | ||
742 | ret = -ENAMETOOLONG; | |
45222b9e | 743 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
744 | goto error; |
745 | ||
746 | key = afs_request_key(dvnode->volume->cell); | |
747 | if (IS_ERR(key)) { | |
748 | ret = PTR_ERR(key); | |
749 | goto error; | |
750 | } | |
751 | ||
752 | mode |= S_IFDIR; | |
753 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
754 | mode, &fid, &status, &cb, &server); | |
755 | if (ret < 0) | |
756 | goto mkdir_error; | |
757 | ||
758 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
759 | if (IS_ERR(inode)) { | |
760 | /* ENOMEM at a really inconvenient time - just abandon the new | |
761 | * directory on the server */ | |
762 | ret = PTR_ERR(inode); | |
763 | goto iget_error; | |
764 | } | |
765 | ||
766 | /* apply the status report we've got for the new vnode */ | |
767 | vnode = AFS_FS_I(inode); | |
768 | spin_lock(&vnode->lock); | |
769 | vnode->update_cnt++; | |
770 | spin_unlock(&vnode->lock); | |
771 | afs_vnode_finalise_status_update(vnode, server); | |
772 | afs_put_server(server); | |
773 | ||
774 | d_instantiate(dentry, inode); | |
775 | if (d_unhashed(dentry)) { | |
776 | _debug("not hashed"); | |
777 | d_rehash(dentry); | |
778 | } | |
779 | key_put(key); | |
780 | _leave(" = 0"); | |
781 | return 0; | |
782 | ||
783 | iget_error: | |
784 | afs_put_server(server); | |
785 | mkdir_error: | |
786 | key_put(key); | |
787 | error: | |
788 | d_drop(dentry); | |
789 | _leave(" = %d", ret); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | /* | |
794 | * remove a directory from an AFS filesystem | |
795 | */ | |
796 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
797 | { | |
798 | struct afs_vnode *dvnode, *vnode; | |
799 | struct key *key; | |
800 | int ret; | |
801 | ||
802 | dvnode = AFS_FS_I(dir); | |
803 | ||
416351f2 | 804 | _enter("{%x:%u},{%s}", |
260a9803 DH |
805 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
806 | ||
807 | ret = -ENAMETOOLONG; | |
45222b9e | 808 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
809 | goto error; |
810 | ||
811 | key = afs_request_key(dvnode->volume->cell); | |
812 | if (IS_ERR(key)) { | |
813 | ret = PTR_ERR(key); | |
814 | goto error; | |
815 | } | |
816 | ||
817 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); | |
818 | if (ret < 0) | |
819 | goto rmdir_error; | |
820 | ||
821 | if (dentry->d_inode) { | |
822 | vnode = AFS_FS_I(dentry->d_inode); | |
823 | clear_nlink(&vnode->vfs_inode); | |
824 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
825 | afs_discard_callback_on_delete(vnode); | |
826 | } | |
827 | ||
828 | key_put(key); | |
829 | _leave(" = 0"); | |
830 | return 0; | |
831 | ||
832 | rmdir_error: | |
833 | key_put(key); | |
834 | error: | |
835 | _leave(" = %d", ret); | |
836 | return ret; | |
837 | } | |
838 | ||
839 | /* | |
840 | * remove a file from an AFS filesystem | |
841 | */ | |
842 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
843 | { | |
844 | struct afs_vnode *dvnode, *vnode; | |
845 | struct key *key; | |
846 | int ret; | |
847 | ||
848 | dvnode = AFS_FS_I(dir); | |
849 | ||
416351f2 | 850 | _enter("{%x:%u},{%s}", |
260a9803 DH |
851 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
852 | ||
853 | ret = -ENAMETOOLONG; | |
45222b9e | 854 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
855 | goto error; |
856 | ||
857 | key = afs_request_key(dvnode->volume->cell); | |
858 | if (IS_ERR(key)) { | |
859 | ret = PTR_ERR(key); | |
860 | goto error; | |
861 | } | |
862 | ||
863 | if (dentry->d_inode) { | |
864 | vnode = AFS_FS_I(dentry->d_inode); | |
865 | ||
866 | /* make sure we have a callback promise on the victim */ | |
867 | ret = afs_validate(vnode, key); | |
868 | if (ret < 0) | |
869 | goto error; | |
870 | } | |
871 | ||
872 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); | |
873 | if (ret < 0) | |
874 | goto remove_error; | |
875 | ||
876 | if (dentry->d_inode) { | |
877 | /* if the file wasn't deleted due to excess hard links, the | |
878 | * fileserver will break the callback promise on the file - if | |
879 | * it had one - before it returns to us, and if it was deleted, | |
880 | * it won't | |
881 | * | |
882 | * however, if we didn't have a callback promise outstanding, | |
883 | * or it was outstanding on a different server, then it won't | |
884 | * break it either... | |
885 | */ | |
886 | vnode = AFS_FS_I(dentry->d_inode); | |
887 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
888 | _debug("AFS_VNODE_DELETED"); | |
889 | if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) | |
890 | _debug("AFS_VNODE_CB_BROKEN"); | |
891 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
892 | ret = afs_validate(vnode, key); | |
893 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
894 | } | |
895 | ||
896 | key_put(key); | |
897 | _leave(" = 0"); | |
898 | return 0; | |
899 | ||
900 | remove_error: | |
901 | key_put(key); | |
902 | error: | |
903 | _leave(" = %d", ret); | |
904 | return ret; | |
905 | } | |
906 | ||
907 | /* | |
908 | * create a regular file on an AFS filesystem | |
909 | */ | |
910 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, | |
911 | struct nameidata *nd) | |
912 | { | |
913 | struct afs_file_status status; | |
914 | struct afs_callback cb; | |
915 | struct afs_server *server; | |
916 | struct afs_vnode *dvnode, *vnode; | |
917 | struct afs_fid fid; | |
918 | struct inode *inode; | |
919 | struct key *key; | |
920 | int ret; | |
921 | ||
922 | dvnode = AFS_FS_I(dir); | |
923 | ||
416351f2 | 924 | _enter("{%x:%u},{%s},%o,", |
260a9803 DH |
925 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
926 | ||
927 | ret = -ENAMETOOLONG; | |
45222b9e | 928 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
929 | goto error; |
930 | ||
931 | key = afs_request_key(dvnode->volume->cell); | |
932 | if (IS_ERR(key)) { | |
933 | ret = PTR_ERR(key); | |
934 | goto error; | |
935 | } | |
936 | ||
937 | mode |= S_IFREG; | |
938 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
939 | mode, &fid, &status, &cb, &server); | |
940 | if (ret < 0) | |
941 | goto create_error; | |
942 | ||
943 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
944 | if (IS_ERR(inode)) { | |
945 | /* ENOMEM at a really inconvenient time - just abandon the new | |
946 | * directory on the server */ | |
947 | ret = PTR_ERR(inode); | |
948 | goto iget_error; | |
949 | } | |
950 | ||
951 | /* apply the status report we've got for the new vnode */ | |
952 | vnode = AFS_FS_I(inode); | |
953 | spin_lock(&vnode->lock); | |
954 | vnode->update_cnt++; | |
955 | spin_unlock(&vnode->lock); | |
956 | afs_vnode_finalise_status_update(vnode, server); | |
957 | afs_put_server(server); | |
958 | ||
959 | d_instantiate(dentry, inode); | |
960 | if (d_unhashed(dentry)) { | |
961 | _debug("not hashed"); | |
962 | d_rehash(dentry); | |
963 | } | |
964 | key_put(key); | |
965 | _leave(" = 0"); | |
966 | return 0; | |
967 | ||
968 | iget_error: | |
969 | afs_put_server(server); | |
970 | create_error: | |
971 | key_put(key); | |
972 | error: | |
973 | d_drop(dentry); | |
974 | _leave(" = %d", ret); | |
975 | return ret; | |
976 | } | |
977 | ||
978 | /* | |
979 | * create a hard link between files in an AFS filesystem | |
980 | */ | |
981 | static int afs_link(struct dentry *from, struct inode *dir, | |
982 | struct dentry *dentry) | |
983 | { | |
984 | struct afs_vnode *dvnode, *vnode; | |
985 | struct key *key; | |
986 | int ret; | |
987 | ||
988 | vnode = AFS_FS_I(from->d_inode); | |
989 | dvnode = AFS_FS_I(dir); | |
990 | ||
416351f2 | 991 | _enter("{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
992 | vnode->fid.vid, vnode->fid.vnode, |
993 | dvnode->fid.vid, dvnode->fid.vnode, | |
994 | dentry->d_name.name); | |
995 | ||
996 | ret = -ENAMETOOLONG; | |
45222b9e | 997 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
998 | goto error; |
999 | ||
1000 | key = afs_request_key(dvnode->volume->cell); | |
1001 | if (IS_ERR(key)) { | |
1002 | ret = PTR_ERR(key); | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); | |
1007 | if (ret < 0) | |
1008 | goto link_error; | |
1009 | ||
1010 | atomic_inc(&vnode->vfs_inode.i_count); | |
1011 | d_instantiate(dentry, &vnode->vfs_inode); | |
1012 | key_put(key); | |
1013 | _leave(" = 0"); | |
1014 | return 0; | |
1015 | ||
1016 | link_error: | |
1017 | key_put(key); | |
1018 | error: | |
1019 | d_drop(dentry); | |
1020 | _leave(" = %d", ret); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * create a symlink in an AFS filesystem | |
1026 | */ | |
1027 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1028 | const char *content) | |
1029 | { | |
1030 | struct afs_file_status status; | |
1031 | struct afs_server *server; | |
1032 | struct afs_vnode *dvnode, *vnode; | |
1033 | struct afs_fid fid; | |
1034 | struct inode *inode; | |
1035 | struct key *key; | |
1036 | int ret; | |
1037 | ||
1038 | dvnode = AFS_FS_I(dir); | |
1039 | ||
416351f2 | 1040 | _enter("{%x:%u},{%s},%s", |
260a9803 DH |
1041 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, |
1042 | content); | |
1043 | ||
1044 | ret = -ENAMETOOLONG; | |
45222b9e | 1045 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1046 | goto error; |
1047 | ||
1048 | ret = -EINVAL; | |
45222b9e | 1049 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1050 | goto error; |
1051 | ||
1052 | key = afs_request_key(dvnode->volume->cell); | |
1053 | if (IS_ERR(key)) { | |
1054 | ret = PTR_ERR(key); | |
1055 | goto error; | |
1056 | } | |
1057 | ||
1058 | ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, | |
1059 | &fid, &status, &server); | |
1060 | if (ret < 0) | |
1061 | goto create_error; | |
1062 | ||
1063 | inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); | |
1064 | if (IS_ERR(inode)) { | |
1065 | /* ENOMEM at a really inconvenient time - just abandon the new | |
1066 | * directory on the server */ | |
1067 | ret = PTR_ERR(inode); | |
1068 | goto iget_error; | |
1069 | } | |
1070 | ||
1071 | /* apply the status report we've got for the new vnode */ | |
1072 | vnode = AFS_FS_I(inode); | |
1073 | spin_lock(&vnode->lock); | |
1074 | vnode->update_cnt++; | |
1075 | spin_unlock(&vnode->lock); | |
1076 | afs_vnode_finalise_status_update(vnode, server); | |
1077 | afs_put_server(server); | |
1078 | ||
1079 | d_instantiate(dentry, inode); | |
1080 | if (d_unhashed(dentry)) { | |
1081 | _debug("not hashed"); | |
1082 | d_rehash(dentry); | |
1083 | } | |
1084 | key_put(key); | |
1085 | _leave(" = 0"); | |
1086 | return 0; | |
1087 | ||
1088 | iget_error: | |
1089 | afs_put_server(server); | |
1090 | create_error: | |
1091 | key_put(key); | |
1092 | error: | |
1093 | d_drop(dentry); | |
1094 | _leave(" = %d", ret); | |
1095 | return ret; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * rename a file in an AFS filesystem and/or move it between directories | |
1100 | */ | |
1101 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1102 | struct inode *new_dir, struct dentry *new_dentry) | |
1103 | { | |
1104 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; | |
1105 | struct key *key; | |
1106 | int ret; | |
1107 | ||
1108 | vnode = AFS_FS_I(old_dentry->d_inode); | |
1109 | orig_dvnode = AFS_FS_I(old_dir); | |
1110 | new_dvnode = AFS_FS_I(new_dir); | |
1111 | ||
416351f2 | 1112 | _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
1113 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1114 | vnode->fid.vid, vnode->fid.vnode, | |
1115 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
1116 | new_dentry->d_name.name); | |
1117 | ||
1118 | ret = -ENAMETOOLONG; | |
45222b9e | 1119 | if (new_dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1120 | goto error; |
1121 | ||
1122 | key = afs_request_key(orig_dvnode->volume->cell); | |
1123 | if (IS_ERR(key)) { | |
1124 | ret = PTR_ERR(key); | |
1125 | goto error; | |
1126 | } | |
1127 | ||
1128 | ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, | |
1129 | old_dentry->d_name.name, | |
1130 | new_dentry->d_name.name); | |
1131 | if (ret < 0) | |
1132 | goto rename_error; | |
1133 | key_put(key); | |
1134 | _leave(" = 0"); | |
1135 | return 0; | |
1136 | ||
1137 | rename_error: | |
1138 | key_put(key); | |
1139 | error: | |
1140 | d_drop(new_dentry); | |
1141 | _leave(" = %d", ret); | |
1142 | return ret; | |
1143 | } |