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Commit | Line | Data |
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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/fs.h> |
16 | #include <linux/pagemap.h> | |
00d3b7a4 | 17 | #include <linux/ctype.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
1da177e4 LT |
19 | #include "internal.h" |
20 | ||
260a9803 DH |
21 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
22 | struct nameidata *nd); | |
1da177e4 | 23 | static int afs_dir_open(struct inode *inode, struct file *file); |
260a9803 | 24 | static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); |
1da177e4 LT |
25 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); |
26 | static int afs_d_delete(struct dentry *dentry); | |
260a9803 DH |
27 | static void afs_d_release(struct dentry *dentry); |
28 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, | |
afefdbb2 | 29 | loff_t fpos, u64 ino, unsigned dtype); |
260a9803 DH |
30 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, |
31 | struct nameidata *nd); | |
32 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); | |
33 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); | |
34 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
35 | static int afs_link(struct dentry *from, struct inode *dir, | |
36 | struct dentry *dentry); | |
37 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
38 | const char *content); | |
39 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
40 | struct inode *new_dir, struct dentry *new_dentry); | |
1da177e4 | 41 | |
4b6f5d20 | 42 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 43 | .open = afs_dir_open, |
00d3b7a4 | 44 | .release = afs_release, |
260a9803 | 45 | .readdir = afs_readdir, |
e8d6c554 | 46 | .lock = afs_lock, |
3222a3e5 | 47 | .llseek = generic_file_llseek, |
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 | ||
79be57cc | 64 | static const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
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", |
530b6412 | 143 | __func__, dir->i_ino, qty, |
08e0e7c8 | 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", | |
530b6412 | 162 | __func__, dir->i_ino, tmp, qty, |
1da177e4 LT |
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; | |
1da177e4 LT |
192 | _enter("{%lu},%lu", dir->i_ino, index); |
193 | ||
f6d335c0 | 194 | page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
1da177e4 | 195 | if (!IS_ERR(page)) { |
1da177e4 | 196 | kmap(page); |
1da177e4 LT |
197 | if (!PageChecked(page)) |
198 | afs_dir_check_page(dir, page); | |
199 | if (PageError(page)) | |
200 | goto fail; | |
201 | } | |
202 | return page; | |
203 | ||
ec26815a | 204 | fail: |
1da177e4 | 205 | afs_dir_put_page(page); |
08e0e7c8 | 206 | _leave(" = -EIO"); |
1da177e4 | 207 | return ERR_PTR(-EIO); |
ec26815a | 208 | } |
1da177e4 | 209 | |
1da177e4 LT |
210 | /* |
211 | * open an AFS directory file | |
212 | */ | |
213 | static int afs_dir_open(struct inode *inode, struct file *file) | |
214 | { | |
215 | _enter("{%lu}", inode->i_ino); | |
216 | ||
2ecd05ae AD |
217 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
218 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 219 | |
08e0e7c8 | 220 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
221 | return -ENOENT; |
222 | ||
00d3b7a4 | 223 | return afs_open(inode, file); |
ec26815a | 224 | } |
1da177e4 | 225 | |
1da177e4 LT |
226 | /* |
227 | * deal with one block in an AFS directory | |
228 | */ | |
229 | static int afs_dir_iterate_block(unsigned *fpos, | |
230 | union afs_dir_block *block, | |
231 | unsigned blkoff, | |
232 | void *cookie, | |
233 | filldir_t filldir) | |
234 | { | |
235 | union afs_dirent *dire; | |
236 | unsigned offset, next, curr; | |
237 | size_t nlen; | |
238 | int tmp, ret; | |
239 | ||
240 | _enter("%u,%x,%p,,",*fpos,blkoff,block); | |
241 | ||
242 | curr = (*fpos - blkoff) / sizeof(union afs_dirent); | |
243 | ||
244 | /* walk through the block, an entry at a time */ | |
245 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
246 | offset < AFS_DIRENT_PER_BLOCK; | |
247 | offset = next | |
248 | ) { | |
249 | next = offset + 1; | |
250 | ||
251 | /* skip entries marked unused in the bitmap */ | |
252 | if (!(block->pagehdr.bitmap[offset / 8] & | |
253 | (1 << (offset % 8)))) { | |
08e0e7c8 | 254 | _debug("ENT[%Zu.%u]: unused", |
1da177e4 LT |
255 | blkoff / sizeof(union afs_dir_block), offset); |
256 | if (offset >= curr) | |
257 | *fpos = blkoff + | |
258 | next * sizeof(union afs_dirent); | |
259 | continue; | |
260 | } | |
261 | ||
262 | /* got a valid entry */ | |
263 | dire = &block->dirents[offset]; | |
264 | nlen = strnlen(dire->u.name, | |
265 | sizeof(*block) - | |
266 | offset * sizeof(union afs_dirent)); | |
267 | ||
08e0e7c8 | 268 | _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
1da177e4 LT |
269 | blkoff / sizeof(union afs_dir_block), offset, |
270 | (offset < curr ? "skip" : "fill"), | |
271 | nlen, dire->u.name); | |
272 | ||
273 | /* work out where the next possible entry is */ | |
274 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
275 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
276 | _debug("ENT[%Zu.%u]:" | |
277 | " %u travelled beyond end dir block" | |
08e0e7c8 | 278 | " (len %u/%Zu)", |
1da177e4 LT |
279 | blkoff / sizeof(union afs_dir_block), |
280 | offset, next, tmp, nlen); | |
281 | return -EIO; | |
282 | } | |
283 | if (!(block->pagehdr.bitmap[next / 8] & | |
284 | (1 << (next % 8)))) { | |
285 | _debug("ENT[%Zu.%u]:" | |
08e0e7c8 | 286 | " %u unmarked extension (len %u/%Zu)", |
1da177e4 LT |
287 | blkoff / sizeof(union afs_dir_block), |
288 | offset, next, tmp, nlen); | |
289 | return -EIO; | |
290 | } | |
291 | ||
08e0e7c8 | 292 | _debug("ENT[%Zu.%u]: ext %u/%Zu", |
1da177e4 LT |
293 | blkoff / sizeof(union afs_dir_block), |
294 | next, tmp, nlen); | |
295 | next++; | |
296 | } | |
297 | ||
298 | /* skip if starts before the current position */ | |
299 | if (offset < curr) | |
300 | continue; | |
301 | ||
302 | /* found the next entry */ | |
303 | ret = filldir(cookie, | |
304 | dire->u.name, | |
305 | nlen, | |
306 | blkoff + offset * sizeof(union afs_dirent), | |
307 | ntohl(dire->u.vnode), | |
260a9803 | 308 | filldir == afs_lookup_filldir ? |
1da177e4 LT |
309 | ntohl(dire->u.unique) : DT_UNKNOWN); |
310 | if (ret < 0) { | |
311 | _leave(" = 0 [full]"); | |
312 | return 0; | |
313 | } | |
314 | ||
315 | *fpos = blkoff + next * sizeof(union afs_dirent); | |
316 | } | |
317 | ||
318 | _leave(" = 1 [more]"); | |
319 | return 1; | |
ec26815a | 320 | } |
1da177e4 | 321 | |
1da177e4 | 322 | /* |
08e0e7c8 | 323 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 LT |
324 | */ |
325 | static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, | |
00d3b7a4 | 326 | filldir_t filldir, struct key *key) |
1da177e4 | 327 | { |
08e0e7c8 | 328 | union afs_dir_block *dblock; |
1da177e4 LT |
329 | struct afs_dir_page *dbuf; |
330 | struct page *page; | |
331 | unsigned blkoff, limit; | |
332 | int ret; | |
333 | ||
334 | _enter("{%lu},%u,,", dir->i_ino, *fpos); | |
335 | ||
08e0e7c8 | 336 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
337 | _leave(" = -ESTALE"); |
338 | return -ESTALE; | |
339 | } | |
340 | ||
341 | /* round the file position up to the next entry boundary */ | |
342 | *fpos += sizeof(union afs_dirent) - 1; | |
343 | *fpos &= ~(sizeof(union afs_dirent) - 1); | |
344 | ||
345 | /* walk through the blocks in sequence */ | |
346 | ret = 0; | |
347 | while (*fpos < dir->i_size) { | |
348 | blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); | |
349 | ||
350 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 351 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
352 | if (IS_ERR(page)) { |
353 | ret = PTR_ERR(page); | |
354 | break; | |
355 | } | |
356 | ||
357 | limit = blkoff & ~(PAGE_SIZE - 1); | |
358 | ||
359 | dbuf = page_address(page); | |
360 | ||
361 | /* deal with the individual blocks stashed on this page */ | |
362 | do { | |
363 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
364 | sizeof(union afs_dir_block)]; | |
365 | ret = afs_dir_iterate_block(fpos, dblock, blkoff, | |
366 | cookie, filldir); | |
367 | if (ret != 1) { | |
368 | afs_dir_put_page(page); | |
369 | goto out; | |
370 | } | |
371 | ||
372 | blkoff += sizeof(union afs_dir_block); | |
373 | ||
374 | } while (*fpos < dir->i_size && blkoff < limit); | |
375 | ||
376 | afs_dir_put_page(page); | |
377 | ret = 0; | |
378 | } | |
379 | ||
ec26815a | 380 | out: |
1da177e4 LT |
381 | _leave(" = %d", ret); |
382 | return ret; | |
ec26815a | 383 | } |
1da177e4 | 384 | |
1da177e4 LT |
385 | /* |
386 | * read an AFS directory | |
387 | */ | |
260a9803 | 388 | static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) |
1da177e4 LT |
389 | { |
390 | unsigned fpos; | |
391 | int ret; | |
392 | ||
08e0e7c8 DH |
393 | _enter("{%Ld,{%lu}}", |
394 | file->f_pos, file->f_path.dentry->d_inode->i_ino); | |
1da177e4 | 395 | |
00d3b7a4 DH |
396 | ASSERT(file->private_data != NULL); |
397 | ||
1da177e4 | 398 | fpos = file->f_pos; |
08e0e7c8 | 399 | ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, |
00d3b7a4 | 400 | cookie, filldir, file->private_data); |
1da177e4 LT |
401 | file->f_pos = fpos; |
402 | ||
403 | _leave(" = %d", ret); | |
404 | return ret; | |
ec26815a | 405 | } |
1da177e4 | 406 | |
1da177e4 LT |
407 | /* |
408 | * search the directory for a name | |
409 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
410 | * uniquifier through dtype | |
411 | */ | |
260a9803 DH |
412 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, |
413 | loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 414 | { |
260a9803 | 415 | struct afs_lookup_cookie *cookie = _cookie; |
1da177e4 | 416 | |
08e0e7c8 | 417 | _enter("{%s,%Zu},%s,%u,,%llu,%u", |
ba3e0e1a DM |
418 | cookie->name, cookie->nlen, name, nlen, |
419 | (unsigned long long) ino, dtype); | |
1da177e4 | 420 | |
08e0e7c8 DH |
421 | /* insanity checks first */ |
422 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
423 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
424 | ||
1da177e4 LT |
425 | if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { |
426 | _leave(" = 0 [no]"); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | cookie->fid.vnode = ino; | |
431 | cookie->fid.unique = dtype; | |
432 | cookie->found = 1; | |
433 | ||
434 | _leave(" = -1 [found]"); | |
435 | return -1; | |
ec26815a | 436 | } |
1da177e4 | 437 | |
1da177e4 | 438 | /* |
08e0e7c8 | 439 | * do a lookup in a directory |
260a9803 | 440 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 441 | */ |
08e0e7c8 | 442 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 443 | struct afs_fid *fid, struct key *key) |
1da177e4 | 444 | { |
260a9803 | 445 | struct afs_lookup_cookie cookie; |
1da177e4 | 446 | struct afs_super_info *as; |
1da177e4 LT |
447 | unsigned fpos; |
448 | int ret; | |
449 | ||
08e0e7c8 | 450 | _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); |
1da177e4 LT |
451 | |
452 | as = dir->i_sb->s_fs_info; | |
453 | ||
454 | /* search the directory */ | |
455 | cookie.name = dentry->d_name.name; | |
456 | cookie.nlen = dentry->d_name.len; | |
457 | cookie.fid.vid = as->volume->vid; | |
458 | cookie.found = 0; | |
459 | ||
460 | fpos = 0; | |
260a9803 | 461 | ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, |
00d3b7a4 | 462 | key); |
1da177e4 | 463 | if (ret < 0) { |
08e0e7c8 DH |
464 | _leave(" = %d [iter]", ret); |
465 | return ret; | |
1da177e4 LT |
466 | } |
467 | ||
468 | ret = -ENOENT; | |
469 | if (!cookie.found) { | |
08e0e7c8 DH |
470 | _leave(" = -ENOENT [not found]"); |
471 | return -ENOENT; | |
1da177e4 LT |
472 | } |
473 | ||
08e0e7c8 DH |
474 | *fid = cookie.fid; |
475 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | /* | |
480 | * look up an entry in a directory | |
481 | */ | |
260a9803 DH |
482 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
483 | struct nameidata *nd) | |
08e0e7c8 DH |
484 | { |
485 | struct afs_vnode *vnode; | |
486 | struct afs_fid fid; | |
487 | struct inode *inode; | |
00d3b7a4 | 488 | struct key *key; |
08e0e7c8 DH |
489 | int ret; |
490 | ||
260a9803 DH |
491 | vnode = AFS_FS_I(dir); |
492 | ||
416351f2 | 493 | _enter("{%x:%u},%p{%s},", |
260a9803 DH |
494 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); |
495 | ||
496 | ASSERTCMP(dentry->d_inode, ==, NULL); | |
08e0e7c8 | 497 | |
45222b9e | 498 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
499 | _leave(" = -ENAMETOOLONG"); |
500 | return ERR_PTR(-ENAMETOOLONG); | |
501 | } | |
502 | ||
08e0e7c8 DH |
503 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
504 | _leave(" = -ESTALE"); | |
505 | return ERR_PTR(-ESTALE); | |
506 | } | |
507 | ||
00d3b7a4 DH |
508 | key = afs_request_key(vnode->volume->cell); |
509 | if (IS_ERR(key)) { | |
510 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 511 | return ERR_CAST(key); |
00d3b7a4 DH |
512 | } |
513 | ||
260a9803 DH |
514 | ret = afs_validate(vnode, key); |
515 | if (ret < 0) { | |
516 | key_put(key); | |
517 | _leave(" = %d [val]", ret); | |
518 | return ERR_PTR(ret); | |
519 | } | |
520 | ||
00d3b7a4 | 521 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 522 | if (ret < 0) { |
00d3b7a4 | 523 | key_put(key); |
260a9803 DH |
524 | if (ret == -ENOENT) { |
525 | d_add(dentry, NULL); | |
526 | _leave(" = NULL [negative]"); | |
527 | return NULL; | |
528 | } | |
08e0e7c8 | 529 | _leave(" = %d [do]", ret); |
1da177e4 LT |
530 | return ERR_PTR(ret); |
531 | } | |
260a9803 | 532 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 533 | |
08e0e7c8 | 534 | /* instantiate the dentry */ |
260a9803 | 535 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
00d3b7a4 | 536 | key_put(key); |
08e0e7c8 DH |
537 | if (IS_ERR(inode)) { |
538 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 539 | return ERR_CAST(inode); |
08e0e7c8 DH |
540 | } |
541 | ||
1da177e4 | 542 | dentry->d_op = &afs_fs_dentry_operations; |
1da177e4 LT |
543 | |
544 | d_add(dentry, inode); | |
7a224228 | 545 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", |
08e0e7c8 DH |
546 | fid.vnode, |
547 | fid.unique, | |
1da177e4 | 548 | dentry->d_inode->i_ino, |
7a224228 | 549 | (unsigned long long)dentry->d_inode->i_version); |
1da177e4 LT |
550 | |
551 | return NULL; | |
ec26815a | 552 | } |
1da177e4 | 553 | |
1da177e4 LT |
554 | /* |
555 | * check that a dentry lookup hit has found a valid entry | |
556 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
557 | * inode | |
1da177e4 LT |
558 | */ |
559 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
560 | { | |
260a9803 | 561 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 562 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 563 | struct dentry *parent; |
00d3b7a4 | 564 | struct key *key; |
260a9803 | 565 | void *dir_version; |
1da177e4 LT |
566 | int ret; |
567 | ||
08e0e7c8 DH |
568 | vnode = AFS_FS_I(dentry->d_inode); |
569 | ||
260a9803 DH |
570 | if (dentry->d_inode) |
571 | _enter("{v={%x:%u} n=%s fl=%lx},", | |
572 | vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, | |
573 | vnode->flags); | |
574 | else | |
575 | _enter("{neg n=%s}", dentry->d_name.name); | |
1da177e4 | 576 | |
260a9803 | 577 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
578 | if (IS_ERR(key)) |
579 | key = NULL; | |
580 | ||
1da177e4 | 581 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 582 | parent = dget_parent(dentry); |
260a9803 | 583 | if (!parent->d_inode) |
1da177e4 LT |
584 | goto out_bad; |
585 | ||
260a9803 | 586 | dir = AFS_FS_I(parent->d_inode); |
1da177e4 | 587 | |
260a9803 DH |
588 | /* validate the parent directory */ |
589 | if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) | |
590 | afs_validate(dir, key); | |
591 | ||
592 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
1da177e4 LT |
593 | _debug("%s: parent dir deleted", dentry->d_name.name); |
594 | goto out_bad; | |
595 | } | |
596 | ||
260a9803 DH |
597 | dir_version = (void *) (unsigned long) dir->status.data_version; |
598 | if (dentry->d_fsdata == dir_version) | |
599 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 600 | |
260a9803 DH |
601 | _debug("dir modified"); |
602 | ||
603 | /* search the directory for this vnode */ | |
604 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
605 | switch (ret) { | |
606 | case 0: | |
607 | /* the filename maps to something */ | |
608 | if (!dentry->d_inode) | |
609 | goto out_bad; | |
610 | if (is_bad_inode(dentry->d_inode)) { | |
611 | printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", | |
612 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
613 | goto out_bad; |
614 | } | |
615 | ||
1da177e4 LT |
616 | /* if the vnode ID has changed, then the dirent points to a |
617 | * different file */ | |
08e0e7c8 DH |
618 | if (fid.vnode != vnode->fid.vnode) { |
619 | _debug("%s: dirent changed [%u != %u]", | |
620 | dentry->d_name.name, fid.vnode, | |
621 | vnode->fid.vnode); | |
1da177e4 LT |
622 | goto not_found; |
623 | } | |
624 | ||
625 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
626 | * been deleted and replaced, and the original vnode ID has |
627 | * been reused */ | |
08e0e7c8 | 628 | if (fid.unique != vnode->fid.unique) { |
7a224228 | 629 | _debug("%s: file deleted (uq %u -> %u I:%llu)", |
08e0e7c8 | 630 | dentry->d_name.name, fid.unique, |
7a224228 JNC |
631 | vnode->fid.unique, |
632 | (unsigned long long)dentry->d_inode->i_version); | |
08e0e7c8 DH |
633 | spin_lock(&vnode->lock); |
634 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
635 | spin_unlock(&vnode->lock); | |
260a9803 | 636 | goto not_found; |
1da177e4 | 637 | } |
260a9803 | 638 | goto out_valid; |
08e0e7c8 | 639 | |
260a9803 DH |
640 | case -ENOENT: |
641 | /* the filename is unknown */ | |
642 | _debug("%s: dirent not found", dentry->d_name.name); | |
643 | if (dentry->d_inode) | |
644 | goto not_found; | |
645 | goto out_valid; | |
1da177e4 | 646 | |
260a9803 DH |
647 | default: |
648 | _debug("failed to iterate dir %s: %d", | |
649 | parent->d_name.name, ret); | |
08e0e7c8 DH |
650 | goto out_bad; |
651 | } | |
652 | ||
ec26815a | 653 | out_valid: |
260a9803 DH |
654 | dentry->d_fsdata = dir_version; |
655 | out_skip: | |
1da177e4 | 656 | dput(parent); |
00d3b7a4 | 657 | key_put(key); |
1da177e4 LT |
658 | _leave(" = 1 [valid]"); |
659 | return 1; | |
660 | ||
661 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 662 | not_found: |
1da177e4 LT |
663 | spin_lock(&dentry->d_lock); |
664 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
665 | spin_unlock(&dentry->d_lock); | |
666 | ||
ec26815a | 667 | out_bad: |
260a9803 | 668 | if (dentry->d_inode) { |
1da177e4 LT |
669 | /* don't unhash if we have submounts */ |
670 | if (have_submounts(dentry)) | |
260a9803 | 671 | goto out_skip; |
1da177e4 LT |
672 | } |
673 | ||
1da177e4 | 674 | _debug("dropping dentry %s/%s", |
08e0e7c8 DH |
675 | parent->d_name.name, dentry->d_name.name); |
676 | shrink_dcache_parent(dentry); | |
1da177e4 | 677 | d_drop(dentry); |
1da177e4 | 678 | dput(parent); |
00d3b7a4 | 679 | key_put(key); |
1da177e4 LT |
680 | |
681 | _leave(" = 0 [bad]"); | |
682 | return 0; | |
ec26815a | 683 | } |
1da177e4 | 684 | |
1da177e4 LT |
685 | /* |
686 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
687 | * sleep) | |
688 | * - called from dput() when d_count is going to 0. | |
689 | * - return 1 to request dentry be unhashed, 0 otherwise | |
690 | */ | |
691 | static int afs_d_delete(struct dentry *dentry) | |
692 | { | |
693 | _enter("%s", dentry->d_name.name); | |
694 | ||
695 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
696 | goto zap; | |
697 | ||
08e0e7c8 DH |
698 | if (dentry->d_inode && |
699 | test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) | |
1da177e4 | 700 | goto zap; |
1da177e4 LT |
701 | |
702 | _leave(" = 0 [keep]"); | |
703 | return 0; | |
704 | ||
ec26815a | 705 | zap: |
1da177e4 LT |
706 | _leave(" = 1 [zap]"); |
707 | return 1; | |
ec26815a | 708 | } |
260a9803 DH |
709 | |
710 | /* | |
711 | * handle dentry release | |
712 | */ | |
713 | static void afs_d_release(struct dentry *dentry) | |
714 | { | |
715 | _enter("%s", dentry->d_name.name); | |
716 | } | |
717 | ||
718 | /* | |
719 | * create a directory on an AFS filesystem | |
720 | */ | |
721 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
722 | { | |
723 | struct afs_file_status status; | |
724 | struct afs_callback cb; | |
725 | struct afs_server *server; | |
726 | struct afs_vnode *dvnode, *vnode; | |
727 | struct afs_fid fid; | |
728 | struct inode *inode; | |
729 | struct key *key; | |
730 | int ret; | |
731 | ||
732 | dvnode = AFS_FS_I(dir); | |
733 | ||
416351f2 | 734 | _enter("{%x:%u},{%s},%o", |
260a9803 DH |
735 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
736 | ||
737 | ret = -ENAMETOOLONG; | |
45222b9e | 738 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
739 | goto error; |
740 | ||
741 | key = afs_request_key(dvnode->volume->cell); | |
742 | if (IS_ERR(key)) { | |
743 | ret = PTR_ERR(key); | |
744 | goto error; | |
745 | } | |
746 | ||
747 | mode |= S_IFDIR; | |
748 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
749 | mode, &fid, &status, &cb, &server); | |
750 | if (ret < 0) | |
751 | goto mkdir_error; | |
752 | ||
753 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
754 | if (IS_ERR(inode)) { | |
755 | /* ENOMEM at a really inconvenient time - just abandon the new | |
756 | * directory on the server */ | |
757 | ret = PTR_ERR(inode); | |
758 | goto iget_error; | |
759 | } | |
760 | ||
761 | /* apply the status report we've got for the new vnode */ | |
762 | vnode = AFS_FS_I(inode); | |
763 | spin_lock(&vnode->lock); | |
764 | vnode->update_cnt++; | |
765 | spin_unlock(&vnode->lock); | |
766 | afs_vnode_finalise_status_update(vnode, server); | |
767 | afs_put_server(server); | |
768 | ||
769 | d_instantiate(dentry, inode); | |
770 | if (d_unhashed(dentry)) { | |
771 | _debug("not hashed"); | |
772 | d_rehash(dentry); | |
773 | } | |
774 | key_put(key); | |
775 | _leave(" = 0"); | |
776 | return 0; | |
777 | ||
778 | iget_error: | |
779 | afs_put_server(server); | |
780 | mkdir_error: | |
781 | key_put(key); | |
782 | error: | |
783 | d_drop(dentry); | |
784 | _leave(" = %d", ret); | |
785 | return ret; | |
786 | } | |
787 | ||
788 | /* | |
789 | * remove a directory from an AFS filesystem | |
790 | */ | |
791 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
792 | { | |
793 | struct afs_vnode *dvnode, *vnode; | |
794 | struct key *key; | |
795 | int ret; | |
796 | ||
797 | dvnode = AFS_FS_I(dir); | |
798 | ||
416351f2 | 799 | _enter("{%x:%u},{%s}", |
260a9803 DH |
800 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
801 | ||
802 | ret = -ENAMETOOLONG; | |
45222b9e | 803 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
804 | goto error; |
805 | ||
806 | key = afs_request_key(dvnode->volume->cell); | |
807 | if (IS_ERR(key)) { | |
808 | ret = PTR_ERR(key); | |
809 | goto error; | |
810 | } | |
811 | ||
812 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); | |
813 | if (ret < 0) | |
814 | goto rmdir_error; | |
815 | ||
816 | if (dentry->d_inode) { | |
817 | vnode = AFS_FS_I(dentry->d_inode); | |
818 | clear_nlink(&vnode->vfs_inode); | |
819 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
820 | afs_discard_callback_on_delete(vnode); | |
821 | } | |
822 | ||
823 | key_put(key); | |
824 | _leave(" = 0"); | |
825 | return 0; | |
826 | ||
827 | rmdir_error: | |
828 | key_put(key); | |
829 | error: | |
830 | _leave(" = %d", ret); | |
831 | return ret; | |
832 | } | |
833 | ||
834 | /* | |
835 | * remove a file from an AFS filesystem | |
836 | */ | |
837 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
838 | { | |
839 | struct afs_vnode *dvnode, *vnode; | |
840 | struct key *key; | |
841 | int ret; | |
842 | ||
843 | dvnode = AFS_FS_I(dir); | |
844 | ||
416351f2 | 845 | _enter("{%x:%u},{%s}", |
260a9803 DH |
846 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
847 | ||
848 | ret = -ENAMETOOLONG; | |
45222b9e | 849 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
850 | goto error; |
851 | ||
852 | key = afs_request_key(dvnode->volume->cell); | |
853 | if (IS_ERR(key)) { | |
854 | ret = PTR_ERR(key); | |
855 | goto error; | |
856 | } | |
857 | ||
858 | if (dentry->d_inode) { | |
859 | vnode = AFS_FS_I(dentry->d_inode); | |
860 | ||
861 | /* make sure we have a callback promise on the victim */ | |
862 | ret = afs_validate(vnode, key); | |
863 | if (ret < 0) | |
864 | goto error; | |
865 | } | |
866 | ||
867 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); | |
868 | if (ret < 0) | |
869 | goto remove_error; | |
870 | ||
871 | if (dentry->d_inode) { | |
872 | /* if the file wasn't deleted due to excess hard links, the | |
873 | * fileserver will break the callback promise on the file - if | |
874 | * it had one - before it returns to us, and if it was deleted, | |
875 | * it won't | |
876 | * | |
877 | * however, if we didn't have a callback promise outstanding, | |
878 | * or it was outstanding on a different server, then it won't | |
879 | * break it either... | |
880 | */ | |
881 | vnode = AFS_FS_I(dentry->d_inode); | |
882 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
883 | _debug("AFS_VNODE_DELETED"); | |
884 | if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) | |
885 | _debug("AFS_VNODE_CB_BROKEN"); | |
886 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
887 | ret = afs_validate(vnode, key); | |
888 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
889 | } | |
890 | ||
891 | key_put(key); | |
892 | _leave(" = 0"); | |
893 | return 0; | |
894 | ||
895 | remove_error: | |
896 | key_put(key); | |
897 | error: | |
898 | _leave(" = %d", ret); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | /* | |
903 | * create a regular file on an AFS filesystem | |
904 | */ | |
905 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, | |
906 | struct nameidata *nd) | |
907 | { | |
908 | struct afs_file_status status; | |
909 | struct afs_callback cb; | |
910 | struct afs_server *server; | |
911 | struct afs_vnode *dvnode, *vnode; | |
912 | struct afs_fid fid; | |
913 | struct inode *inode; | |
914 | struct key *key; | |
915 | int ret; | |
916 | ||
917 | dvnode = AFS_FS_I(dir); | |
918 | ||
416351f2 | 919 | _enter("{%x:%u},{%s},%o,", |
260a9803 DH |
920 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
921 | ||
922 | ret = -ENAMETOOLONG; | |
45222b9e | 923 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
924 | goto error; |
925 | ||
926 | key = afs_request_key(dvnode->volume->cell); | |
927 | if (IS_ERR(key)) { | |
928 | ret = PTR_ERR(key); | |
929 | goto error; | |
930 | } | |
931 | ||
932 | mode |= S_IFREG; | |
933 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
934 | mode, &fid, &status, &cb, &server); | |
935 | if (ret < 0) | |
936 | goto create_error; | |
937 | ||
938 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
939 | if (IS_ERR(inode)) { | |
940 | /* ENOMEM at a really inconvenient time - just abandon the new | |
941 | * directory on the server */ | |
942 | ret = PTR_ERR(inode); | |
943 | goto iget_error; | |
944 | } | |
945 | ||
946 | /* apply the status report we've got for the new vnode */ | |
947 | vnode = AFS_FS_I(inode); | |
948 | spin_lock(&vnode->lock); | |
949 | vnode->update_cnt++; | |
950 | spin_unlock(&vnode->lock); | |
951 | afs_vnode_finalise_status_update(vnode, server); | |
952 | afs_put_server(server); | |
953 | ||
954 | d_instantiate(dentry, inode); | |
955 | if (d_unhashed(dentry)) { | |
956 | _debug("not hashed"); | |
957 | d_rehash(dentry); | |
958 | } | |
959 | key_put(key); | |
960 | _leave(" = 0"); | |
961 | return 0; | |
962 | ||
963 | iget_error: | |
964 | afs_put_server(server); | |
965 | create_error: | |
966 | key_put(key); | |
967 | error: | |
968 | d_drop(dentry); | |
969 | _leave(" = %d", ret); | |
970 | return ret; | |
971 | } | |
972 | ||
973 | /* | |
974 | * create a hard link between files in an AFS filesystem | |
975 | */ | |
976 | static int afs_link(struct dentry *from, struct inode *dir, | |
977 | struct dentry *dentry) | |
978 | { | |
979 | struct afs_vnode *dvnode, *vnode; | |
980 | struct key *key; | |
981 | int ret; | |
982 | ||
983 | vnode = AFS_FS_I(from->d_inode); | |
984 | dvnode = AFS_FS_I(dir); | |
985 | ||
416351f2 | 986 | _enter("{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
987 | vnode->fid.vid, vnode->fid.vnode, |
988 | dvnode->fid.vid, dvnode->fid.vnode, | |
989 | dentry->d_name.name); | |
990 | ||
991 | ret = -ENAMETOOLONG; | |
45222b9e | 992 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
993 | goto error; |
994 | ||
995 | key = afs_request_key(dvnode->volume->cell); | |
996 | if (IS_ERR(key)) { | |
997 | ret = PTR_ERR(key); | |
998 | goto error; | |
999 | } | |
1000 | ||
1001 | ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); | |
1002 | if (ret < 0) | |
1003 | goto link_error; | |
1004 | ||
1005 | atomic_inc(&vnode->vfs_inode.i_count); | |
1006 | d_instantiate(dentry, &vnode->vfs_inode); | |
1007 | key_put(key); | |
1008 | _leave(" = 0"); | |
1009 | return 0; | |
1010 | ||
1011 | link_error: | |
1012 | key_put(key); | |
1013 | error: | |
1014 | d_drop(dentry); | |
1015 | _leave(" = %d", ret); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * create a symlink in an AFS filesystem | |
1021 | */ | |
1022 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1023 | const char *content) | |
1024 | { | |
1025 | struct afs_file_status status; | |
1026 | struct afs_server *server; | |
1027 | struct afs_vnode *dvnode, *vnode; | |
1028 | struct afs_fid fid; | |
1029 | struct inode *inode; | |
1030 | struct key *key; | |
1031 | int ret; | |
1032 | ||
1033 | dvnode = AFS_FS_I(dir); | |
1034 | ||
416351f2 | 1035 | _enter("{%x:%u},{%s},%s", |
260a9803 DH |
1036 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, |
1037 | content); | |
1038 | ||
1039 | ret = -ENAMETOOLONG; | |
45222b9e | 1040 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1041 | goto error; |
1042 | ||
1043 | ret = -EINVAL; | |
45222b9e | 1044 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1045 | goto error; |
1046 | ||
1047 | key = afs_request_key(dvnode->volume->cell); | |
1048 | if (IS_ERR(key)) { | |
1049 | ret = PTR_ERR(key); | |
1050 | goto error; | |
1051 | } | |
1052 | ||
1053 | ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, | |
1054 | &fid, &status, &server); | |
1055 | if (ret < 0) | |
1056 | goto create_error; | |
1057 | ||
1058 | inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); | |
1059 | if (IS_ERR(inode)) { | |
1060 | /* ENOMEM at a really inconvenient time - just abandon the new | |
1061 | * directory on the server */ | |
1062 | ret = PTR_ERR(inode); | |
1063 | goto iget_error; | |
1064 | } | |
1065 | ||
1066 | /* apply the status report we've got for the new vnode */ | |
1067 | vnode = AFS_FS_I(inode); | |
1068 | spin_lock(&vnode->lock); | |
1069 | vnode->update_cnt++; | |
1070 | spin_unlock(&vnode->lock); | |
1071 | afs_vnode_finalise_status_update(vnode, server); | |
1072 | afs_put_server(server); | |
1073 | ||
1074 | d_instantiate(dentry, inode); | |
1075 | if (d_unhashed(dentry)) { | |
1076 | _debug("not hashed"); | |
1077 | d_rehash(dentry); | |
1078 | } | |
1079 | key_put(key); | |
1080 | _leave(" = 0"); | |
1081 | return 0; | |
1082 | ||
1083 | iget_error: | |
1084 | afs_put_server(server); | |
1085 | create_error: | |
1086 | key_put(key); | |
1087 | error: | |
1088 | d_drop(dentry); | |
1089 | _leave(" = %d", ret); | |
1090 | return ret; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * rename a file in an AFS filesystem and/or move it between directories | |
1095 | */ | |
1096 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1097 | struct inode *new_dir, struct dentry *new_dentry) | |
1098 | { | |
1099 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; | |
1100 | struct key *key; | |
1101 | int ret; | |
1102 | ||
1103 | vnode = AFS_FS_I(old_dentry->d_inode); | |
1104 | orig_dvnode = AFS_FS_I(old_dir); | |
1105 | new_dvnode = AFS_FS_I(new_dir); | |
1106 | ||
416351f2 | 1107 | _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
1108 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1109 | vnode->fid.vid, vnode->fid.vnode, | |
1110 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
1111 | new_dentry->d_name.name); | |
1112 | ||
1113 | ret = -ENAMETOOLONG; | |
45222b9e | 1114 | if (new_dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1115 | goto error; |
1116 | ||
1117 | key = afs_request_key(orig_dvnode->volume->cell); | |
1118 | if (IS_ERR(key)) { | |
1119 | ret = PTR_ERR(key); | |
1120 | goto error; | |
1121 | } | |
1122 | ||
1123 | ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, | |
1124 | old_dentry->d_name.name, | |
1125 | new_dentry->d_name.name); | |
1126 | if (ret < 0) | |
1127 | goto rename_error; | |
1128 | key_put(key); | |
1129 | _leave(" = 0"); | |
1130 | return 0; | |
1131 | ||
1132 | rename_error: | |
1133 | key_put(key); | |
1134 | error: | |
1135 | d_drop(new_dentry); | |
1136 | _leave(" = %d", ret); | |
1137 | return ret; | |
1138 | } |