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 | 15 | #include <linux/fs.h> |
34286d66 | 16 | #include <linux/namei.h> |
1da177e4 | 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 | 26 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); |
fe15ce44 | 27 | static int afs_d_delete(const 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 | ||
79be57cc | 65 | static const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
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; | |
1da177e4 LT |
193 | _enter("{%lu},%lu", dir->i_ino, index); |
194 | ||
f6d335c0 | 195 | page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
1da177e4 | 196 | if (!IS_ERR(page)) { |
1da177e4 | 197 | kmap(page); |
1da177e4 LT |
198 | if (!PageChecked(page)) |
199 | afs_dir_check_page(dir, page); | |
200 | if (PageError(page)) | |
201 | goto fail; | |
202 | } | |
203 | return page; | |
204 | ||
ec26815a | 205 | fail: |
1da177e4 | 206 | afs_dir_put_page(page); |
08e0e7c8 | 207 | _leave(" = -EIO"); |
1da177e4 | 208 | return ERR_PTR(-EIO); |
ec26815a | 209 | } |
1da177e4 | 210 | |
1da177e4 LT |
211 | /* |
212 | * open an AFS directory file | |
213 | */ | |
214 | static int afs_dir_open(struct inode *inode, struct file *file) | |
215 | { | |
216 | _enter("{%lu}", inode->i_ino); | |
217 | ||
2ecd05ae AD |
218 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
219 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 220 | |
08e0e7c8 | 221 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
222 | return -ENOENT; |
223 | ||
00d3b7a4 | 224 | return afs_open(inode, file); |
ec26815a | 225 | } |
1da177e4 | 226 | |
1da177e4 LT |
227 | /* |
228 | * deal with one block in an AFS directory | |
229 | */ | |
230 | static int afs_dir_iterate_block(unsigned *fpos, | |
231 | union afs_dir_block *block, | |
232 | unsigned blkoff, | |
233 | void *cookie, | |
234 | filldir_t filldir) | |
235 | { | |
236 | union afs_dirent *dire; | |
237 | unsigned offset, next, curr; | |
238 | size_t nlen; | |
239 | int tmp, ret; | |
240 | ||
241 | _enter("%u,%x,%p,,",*fpos,blkoff,block); | |
242 | ||
243 | curr = (*fpos - blkoff) / sizeof(union afs_dirent); | |
244 | ||
245 | /* walk through the block, an entry at a time */ | |
246 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
247 | offset < AFS_DIRENT_PER_BLOCK; | |
248 | offset = next | |
249 | ) { | |
250 | next = offset + 1; | |
251 | ||
252 | /* skip entries marked unused in the bitmap */ | |
253 | if (!(block->pagehdr.bitmap[offset / 8] & | |
254 | (1 << (offset % 8)))) { | |
08e0e7c8 | 255 | _debug("ENT[%Zu.%u]: unused", |
1da177e4 LT |
256 | blkoff / sizeof(union afs_dir_block), offset); |
257 | if (offset >= curr) | |
258 | *fpos = blkoff + | |
259 | next * sizeof(union afs_dirent); | |
260 | continue; | |
261 | } | |
262 | ||
263 | /* got a valid entry */ | |
264 | dire = &block->dirents[offset]; | |
265 | nlen = strnlen(dire->u.name, | |
266 | sizeof(*block) - | |
267 | offset * sizeof(union afs_dirent)); | |
268 | ||
08e0e7c8 | 269 | _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
1da177e4 LT |
270 | blkoff / sizeof(union afs_dir_block), offset, |
271 | (offset < curr ? "skip" : "fill"), | |
272 | nlen, dire->u.name); | |
273 | ||
274 | /* work out where the next possible entry is */ | |
275 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
276 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
277 | _debug("ENT[%Zu.%u]:" | |
278 | " %u travelled beyond end dir block" | |
08e0e7c8 | 279 | " (len %u/%Zu)", |
1da177e4 LT |
280 | blkoff / sizeof(union afs_dir_block), |
281 | offset, next, tmp, nlen); | |
282 | return -EIO; | |
283 | } | |
284 | if (!(block->pagehdr.bitmap[next / 8] & | |
285 | (1 << (next % 8)))) { | |
286 | _debug("ENT[%Zu.%u]:" | |
08e0e7c8 | 287 | " %u unmarked extension (len %u/%Zu)", |
1da177e4 LT |
288 | blkoff / sizeof(union afs_dir_block), |
289 | offset, next, tmp, nlen); | |
290 | return -EIO; | |
291 | } | |
292 | ||
08e0e7c8 | 293 | _debug("ENT[%Zu.%u]: ext %u/%Zu", |
1da177e4 LT |
294 | blkoff / sizeof(union afs_dir_block), |
295 | next, tmp, nlen); | |
296 | next++; | |
297 | } | |
298 | ||
299 | /* skip if starts before the current position */ | |
300 | if (offset < curr) | |
301 | continue; | |
302 | ||
303 | /* found the next entry */ | |
304 | ret = filldir(cookie, | |
305 | dire->u.name, | |
306 | nlen, | |
307 | blkoff + offset * sizeof(union afs_dirent), | |
308 | ntohl(dire->u.vnode), | |
260a9803 | 309 | filldir == afs_lookup_filldir ? |
1da177e4 LT |
310 | ntohl(dire->u.unique) : DT_UNKNOWN); |
311 | if (ret < 0) { | |
312 | _leave(" = 0 [full]"); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | *fpos = blkoff + next * sizeof(union afs_dirent); | |
317 | } | |
318 | ||
319 | _leave(" = 1 [more]"); | |
320 | return 1; | |
ec26815a | 321 | } |
1da177e4 | 322 | |
1da177e4 | 323 | /* |
08e0e7c8 | 324 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 LT |
325 | */ |
326 | static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, | |
00d3b7a4 | 327 | filldir_t filldir, struct key *key) |
1da177e4 | 328 | { |
08e0e7c8 | 329 | union afs_dir_block *dblock; |
1da177e4 LT |
330 | struct afs_dir_page *dbuf; |
331 | struct page *page; | |
332 | unsigned blkoff, limit; | |
333 | int ret; | |
334 | ||
335 | _enter("{%lu},%u,,", dir->i_ino, *fpos); | |
336 | ||
08e0e7c8 | 337 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
338 | _leave(" = -ESTALE"); |
339 | return -ESTALE; | |
340 | } | |
341 | ||
342 | /* round the file position up to the next entry boundary */ | |
343 | *fpos += sizeof(union afs_dirent) - 1; | |
344 | *fpos &= ~(sizeof(union afs_dirent) - 1); | |
345 | ||
346 | /* walk through the blocks in sequence */ | |
347 | ret = 0; | |
348 | while (*fpos < dir->i_size) { | |
349 | blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); | |
350 | ||
351 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 352 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
353 | if (IS_ERR(page)) { |
354 | ret = PTR_ERR(page); | |
355 | break; | |
356 | } | |
357 | ||
358 | limit = blkoff & ~(PAGE_SIZE - 1); | |
359 | ||
360 | dbuf = page_address(page); | |
361 | ||
362 | /* deal with the individual blocks stashed on this page */ | |
363 | do { | |
364 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
365 | sizeof(union afs_dir_block)]; | |
366 | ret = afs_dir_iterate_block(fpos, dblock, blkoff, | |
367 | cookie, filldir); | |
368 | if (ret != 1) { | |
369 | afs_dir_put_page(page); | |
370 | goto out; | |
371 | } | |
372 | ||
373 | blkoff += sizeof(union afs_dir_block); | |
374 | ||
375 | } while (*fpos < dir->i_size && blkoff < limit); | |
376 | ||
377 | afs_dir_put_page(page); | |
378 | ret = 0; | |
379 | } | |
380 | ||
ec26815a | 381 | out: |
1da177e4 LT |
382 | _leave(" = %d", ret); |
383 | return ret; | |
ec26815a | 384 | } |
1da177e4 | 385 | |
1da177e4 LT |
386 | /* |
387 | * read an AFS directory | |
388 | */ | |
260a9803 | 389 | static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) |
1da177e4 LT |
390 | { |
391 | unsigned fpos; | |
392 | int ret; | |
393 | ||
08e0e7c8 DH |
394 | _enter("{%Ld,{%lu}}", |
395 | file->f_pos, file->f_path.dentry->d_inode->i_ino); | |
1da177e4 | 396 | |
00d3b7a4 DH |
397 | ASSERT(file->private_data != NULL); |
398 | ||
1da177e4 | 399 | fpos = file->f_pos; |
08e0e7c8 | 400 | ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, |
00d3b7a4 | 401 | cookie, filldir, file->private_data); |
1da177e4 LT |
402 | file->f_pos = fpos; |
403 | ||
404 | _leave(" = %d", ret); | |
405 | return ret; | |
ec26815a | 406 | } |
1da177e4 | 407 | |
1da177e4 LT |
408 | /* |
409 | * search the directory for a name | |
410 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
411 | * uniquifier through dtype | |
412 | */ | |
260a9803 DH |
413 | static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, |
414 | loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 415 | { |
260a9803 | 416 | struct afs_lookup_cookie *cookie = _cookie; |
1da177e4 | 417 | |
08e0e7c8 | 418 | _enter("{%s,%Zu},%s,%u,,%llu,%u", |
ba3e0e1a DM |
419 | cookie->name, cookie->nlen, name, nlen, |
420 | (unsigned long long) ino, dtype); | |
1da177e4 | 421 | |
08e0e7c8 DH |
422 | /* insanity checks first */ |
423 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
424 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
425 | ||
1da177e4 LT |
426 | if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { |
427 | _leave(" = 0 [no]"); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | cookie->fid.vnode = ino; | |
432 | cookie->fid.unique = dtype; | |
433 | cookie->found = 1; | |
434 | ||
435 | _leave(" = -1 [found]"); | |
436 | return -1; | |
ec26815a | 437 | } |
1da177e4 | 438 | |
1da177e4 | 439 | /* |
08e0e7c8 | 440 | * do a lookup in a directory |
260a9803 | 441 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 442 | */ |
08e0e7c8 | 443 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 444 | struct afs_fid *fid, struct key *key) |
1da177e4 | 445 | { |
260a9803 | 446 | struct afs_lookup_cookie cookie; |
1da177e4 | 447 | struct afs_super_info *as; |
1da177e4 LT |
448 | unsigned fpos; |
449 | int ret; | |
450 | ||
08e0e7c8 | 451 | _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); |
1da177e4 LT |
452 | |
453 | as = dir->i_sb->s_fs_info; | |
454 | ||
455 | /* search the directory */ | |
456 | cookie.name = dentry->d_name.name; | |
457 | cookie.nlen = dentry->d_name.len; | |
458 | cookie.fid.vid = as->volume->vid; | |
459 | cookie.found = 0; | |
460 | ||
461 | fpos = 0; | |
260a9803 | 462 | ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, |
00d3b7a4 | 463 | key); |
1da177e4 | 464 | if (ret < 0) { |
08e0e7c8 DH |
465 | _leave(" = %d [iter]", ret); |
466 | return ret; | |
1da177e4 LT |
467 | } |
468 | ||
469 | ret = -ENOENT; | |
470 | if (!cookie.found) { | |
08e0e7c8 DH |
471 | _leave(" = -ENOENT [not found]"); |
472 | return -ENOENT; | |
1da177e4 LT |
473 | } |
474 | ||
08e0e7c8 DH |
475 | *fid = cookie.fid; |
476 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
477 | return 0; | |
478 | } | |
479 | ||
bec5eb61 | 480 | /* |
481 | * Try to auto mount the mountpoint with pseudo directory, if the autocell | |
482 | * operation is setted. | |
483 | */ | |
484 | static struct inode *afs_try_auto_mntpt( | |
485 | int ret, struct dentry *dentry, struct inode *dir, struct key *key, | |
486 | struct afs_fid *fid) | |
487 | { | |
488 | const char *devname = dentry->d_name.name; | |
489 | struct afs_vnode *vnode = AFS_FS_I(dir); | |
490 | struct inode *inode; | |
491 | ||
492 | _enter("%d, %p{%s}, {%x:%u}, %p", | |
493 | ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key); | |
494 | ||
495 | if (ret != -ENOENT || | |
496 | !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) | |
497 | goto out; | |
498 | ||
499 | inode = afs_iget_autocell(dir, devname, strlen(devname), key); | |
500 | if (IS_ERR(inode)) { | |
501 | ret = PTR_ERR(inode); | |
502 | goto out; | |
503 | } | |
504 | ||
505 | *fid = AFS_FS_I(inode)->fid; | |
506 | _leave("= %p", inode); | |
507 | return inode; | |
508 | ||
509 | out: | |
510 | _leave("= %d", ret); | |
511 | return ERR_PTR(ret); | |
512 | } | |
513 | ||
08e0e7c8 DH |
514 | /* |
515 | * look up an entry in a directory | |
516 | */ | |
260a9803 DH |
517 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
518 | struct nameidata *nd) | |
08e0e7c8 DH |
519 | { |
520 | struct afs_vnode *vnode; | |
521 | struct afs_fid fid; | |
522 | struct inode *inode; | |
00d3b7a4 | 523 | struct key *key; |
08e0e7c8 DH |
524 | int ret; |
525 | ||
260a9803 DH |
526 | vnode = AFS_FS_I(dir); |
527 | ||
416351f2 | 528 | _enter("{%x:%u},%p{%s},", |
260a9803 DH |
529 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); |
530 | ||
531 | ASSERTCMP(dentry->d_inode, ==, NULL); | |
08e0e7c8 | 532 | |
45222b9e | 533 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
534 | _leave(" = -ENAMETOOLONG"); |
535 | return ERR_PTR(-ENAMETOOLONG); | |
536 | } | |
537 | ||
08e0e7c8 DH |
538 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
539 | _leave(" = -ESTALE"); | |
540 | return ERR_PTR(-ESTALE); | |
541 | } | |
542 | ||
00d3b7a4 DH |
543 | key = afs_request_key(vnode->volume->cell); |
544 | if (IS_ERR(key)) { | |
545 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 546 | return ERR_CAST(key); |
00d3b7a4 DH |
547 | } |
548 | ||
260a9803 DH |
549 | ret = afs_validate(vnode, key); |
550 | if (ret < 0) { | |
551 | key_put(key); | |
552 | _leave(" = %d [val]", ret); | |
553 | return ERR_PTR(ret); | |
554 | } | |
555 | ||
00d3b7a4 | 556 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 557 | if (ret < 0) { |
bec5eb61 | 558 | inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); |
559 | if (!IS_ERR(inode)) { | |
560 | key_put(key); | |
561 | goto success; | |
562 | } | |
563 | ||
564 | ret = PTR_ERR(inode); | |
00d3b7a4 | 565 | key_put(key); |
260a9803 DH |
566 | if (ret == -ENOENT) { |
567 | d_add(dentry, NULL); | |
568 | _leave(" = NULL [negative]"); | |
569 | return NULL; | |
570 | } | |
08e0e7c8 | 571 | _leave(" = %d [do]", ret); |
1da177e4 LT |
572 | return ERR_PTR(ret); |
573 | } | |
260a9803 | 574 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 575 | |
08e0e7c8 | 576 | /* instantiate the dentry */ |
260a9803 | 577 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
00d3b7a4 | 578 | key_put(key); |
08e0e7c8 DH |
579 | if (IS_ERR(inode)) { |
580 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 581 | return ERR_CAST(inode); |
08e0e7c8 DH |
582 | } |
583 | ||
bec5eb61 | 584 | success: |
fb045adb | 585 | d_set_d_op(dentry, &afs_fs_dentry_operations); |
1da177e4 LT |
586 | |
587 | d_add(dentry, inode); | |
7a224228 | 588 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", |
08e0e7c8 DH |
589 | fid.vnode, |
590 | fid.unique, | |
1da177e4 | 591 | dentry->d_inode->i_ino, |
7a224228 | 592 | (unsigned long long)dentry->d_inode->i_version); |
1da177e4 LT |
593 | |
594 | return NULL; | |
ec26815a | 595 | } |
1da177e4 | 596 | |
1da177e4 LT |
597 | /* |
598 | * check that a dentry lookup hit has found a valid entry | |
599 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
600 | * inode | |
1da177e4 LT |
601 | */ |
602 | static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
603 | { | |
260a9803 | 604 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 605 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 606 | struct dentry *parent; |
00d3b7a4 | 607 | struct key *key; |
260a9803 | 608 | void *dir_version; |
1da177e4 LT |
609 | int ret; |
610 | ||
34286d66 NP |
611 | if (nd->flags & LOOKUP_RCU) |
612 | return -ECHILD; | |
613 | ||
08e0e7c8 DH |
614 | vnode = AFS_FS_I(dentry->d_inode); |
615 | ||
260a9803 DH |
616 | if (dentry->d_inode) |
617 | _enter("{v={%x:%u} n=%s fl=%lx},", | |
618 | vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, | |
619 | vnode->flags); | |
620 | else | |
621 | _enter("{neg n=%s}", dentry->d_name.name); | |
1da177e4 | 622 | |
260a9803 | 623 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
624 | if (IS_ERR(key)) |
625 | key = NULL; | |
626 | ||
1da177e4 | 627 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 628 | parent = dget_parent(dentry); |
260a9803 | 629 | if (!parent->d_inode) |
1da177e4 LT |
630 | goto out_bad; |
631 | ||
260a9803 | 632 | dir = AFS_FS_I(parent->d_inode); |
1da177e4 | 633 | |
260a9803 DH |
634 | /* validate the parent directory */ |
635 | if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) | |
636 | afs_validate(dir, key); | |
637 | ||
638 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
1da177e4 LT |
639 | _debug("%s: parent dir deleted", dentry->d_name.name); |
640 | goto out_bad; | |
641 | } | |
642 | ||
260a9803 DH |
643 | dir_version = (void *) (unsigned long) dir->status.data_version; |
644 | if (dentry->d_fsdata == dir_version) | |
645 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 646 | |
260a9803 DH |
647 | _debug("dir modified"); |
648 | ||
649 | /* search the directory for this vnode */ | |
650 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
651 | switch (ret) { | |
652 | case 0: | |
653 | /* the filename maps to something */ | |
654 | if (!dentry->d_inode) | |
655 | goto out_bad; | |
656 | if (is_bad_inode(dentry->d_inode)) { | |
657 | printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", | |
658 | parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
659 | goto out_bad; |
660 | } | |
661 | ||
1da177e4 LT |
662 | /* if the vnode ID has changed, then the dirent points to a |
663 | * different file */ | |
08e0e7c8 DH |
664 | if (fid.vnode != vnode->fid.vnode) { |
665 | _debug("%s: dirent changed [%u != %u]", | |
666 | dentry->d_name.name, fid.vnode, | |
667 | vnode->fid.vnode); | |
1da177e4 LT |
668 | goto not_found; |
669 | } | |
670 | ||
671 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
672 | * been deleted and replaced, and the original vnode ID has |
673 | * been reused */ | |
08e0e7c8 | 674 | if (fid.unique != vnode->fid.unique) { |
7a224228 | 675 | _debug("%s: file deleted (uq %u -> %u I:%llu)", |
08e0e7c8 | 676 | dentry->d_name.name, fid.unique, |
7a224228 JNC |
677 | vnode->fid.unique, |
678 | (unsigned long long)dentry->d_inode->i_version); | |
08e0e7c8 DH |
679 | spin_lock(&vnode->lock); |
680 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
681 | spin_unlock(&vnode->lock); | |
260a9803 | 682 | goto not_found; |
1da177e4 | 683 | } |
260a9803 | 684 | goto out_valid; |
08e0e7c8 | 685 | |
260a9803 DH |
686 | case -ENOENT: |
687 | /* the filename is unknown */ | |
688 | _debug("%s: dirent not found", dentry->d_name.name); | |
689 | if (dentry->d_inode) | |
690 | goto not_found; | |
691 | goto out_valid; | |
1da177e4 | 692 | |
260a9803 DH |
693 | default: |
694 | _debug("failed to iterate dir %s: %d", | |
695 | parent->d_name.name, ret); | |
08e0e7c8 DH |
696 | goto out_bad; |
697 | } | |
698 | ||
ec26815a | 699 | out_valid: |
260a9803 DH |
700 | dentry->d_fsdata = dir_version; |
701 | out_skip: | |
1da177e4 | 702 | dput(parent); |
00d3b7a4 | 703 | key_put(key); |
1da177e4 LT |
704 | _leave(" = 1 [valid]"); |
705 | return 1; | |
706 | ||
707 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 708 | not_found: |
1da177e4 LT |
709 | spin_lock(&dentry->d_lock); |
710 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
711 | spin_unlock(&dentry->d_lock); | |
712 | ||
ec26815a | 713 | out_bad: |
260a9803 | 714 | if (dentry->d_inode) { |
1da177e4 LT |
715 | /* don't unhash if we have submounts */ |
716 | if (have_submounts(dentry)) | |
260a9803 | 717 | goto out_skip; |
1da177e4 LT |
718 | } |
719 | ||
1da177e4 | 720 | _debug("dropping dentry %s/%s", |
08e0e7c8 DH |
721 | parent->d_name.name, dentry->d_name.name); |
722 | shrink_dcache_parent(dentry); | |
1da177e4 | 723 | d_drop(dentry); |
1da177e4 | 724 | dput(parent); |
00d3b7a4 | 725 | key_put(key); |
1da177e4 LT |
726 | |
727 | _leave(" = 0 [bad]"); | |
728 | return 0; | |
ec26815a | 729 | } |
1da177e4 | 730 | |
1da177e4 LT |
731 | /* |
732 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
733 | * sleep) | |
734 | * - called from dput() when d_count is going to 0. | |
735 | * - return 1 to request dentry be unhashed, 0 otherwise | |
736 | */ | |
fe15ce44 | 737 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 LT |
738 | { |
739 | _enter("%s", dentry->d_name.name); | |
740 | ||
741 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
742 | goto zap; | |
743 | ||
08e0e7c8 | 744 | if (dentry->d_inode && |
bec5eb61 | 745 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || |
746 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) | |
747 | goto zap; | |
1da177e4 LT |
748 | |
749 | _leave(" = 0 [keep]"); | |
750 | return 0; | |
751 | ||
ec26815a | 752 | zap: |
1da177e4 LT |
753 | _leave(" = 1 [zap]"); |
754 | return 1; | |
ec26815a | 755 | } |
260a9803 DH |
756 | |
757 | /* | |
758 | * handle dentry release | |
759 | */ | |
760 | static void afs_d_release(struct dentry *dentry) | |
761 | { | |
762 | _enter("%s", dentry->d_name.name); | |
763 | } | |
764 | ||
765 | /* | |
766 | * create a directory on an AFS filesystem | |
767 | */ | |
768 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
769 | { | |
770 | struct afs_file_status status; | |
771 | struct afs_callback cb; | |
772 | struct afs_server *server; | |
773 | struct afs_vnode *dvnode, *vnode; | |
774 | struct afs_fid fid; | |
775 | struct inode *inode; | |
776 | struct key *key; | |
777 | int ret; | |
778 | ||
779 | dvnode = AFS_FS_I(dir); | |
780 | ||
416351f2 | 781 | _enter("{%x:%u},{%s},%o", |
260a9803 DH |
782 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
783 | ||
784 | ret = -ENAMETOOLONG; | |
45222b9e | 785 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
786 | goto error; |
787 | ||
788 | key = afs_request_key(dvnode->volume->cell); | |
789 | if (IS_ERR(key)) { | |
790 | ret = PTR_ERR(key); | |
791 | goto error; | |
792 | } | |
793 | ||
794 | mode |= S_IFDIR; | |
795 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
796 | mode, &fid, &status, &cb, &server); | |
797 | if (ret < 0) | |
798 | goto mkdir_error; | |
799 | ||
800 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
801 | if (IS_ERR(inode)) { | |
802 | /* ENOMEM at a really inconvenient time - just abandon the new | |
803 | * directory on the server */ | |
804 | ret = PTR_ERR(inode); | |
805 | goto iget_error; | |
806 | } | |
807 | ||
808 | /* apply the status report we've got for the new vnode */ | |
809 | vnode = AFS_FS_I(inode); | |
810 | spin_lock(&vnode->lock); | |
811 | vnode->update_cnt++; | |
812 | spin_unlock(&vnode->lock); | |
813 | afs_vnode_finalise_status_update(vnode, server); | |
814 | afs_put_server(server); | |
815 | ||
816 | d_instantiate(dentry, inode); | |
817 | if (d_unhashed(dentry)) { | |
818 | _debug("not hashed"); | |
819 | d_rehash(dentry); | |
820 | } | |
821 | key_put(key); | |
822 | _leave(" = 0"); | |
823 | return 0; | |
824 | ||
825 | iget_error: | |
826 | afs_put_server(server); | |
827 | mkdir_error: | |
828 | key_put(key); | |
829 | error: | |
830 | d_drop(dentry); | |
831 | _leave(" = %d", ret); | |
832 | return ret; | |
833 | } | |
834 | ||
835 | /* | |
836 | * remove a directory from an AFS filesystem | |
837 | */ | |
838 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
839 | { | |
840 | struct afs_vnode *dvnode, *vnode; | |
841 | struct key *key; | |
842 | int ret; | |
843 | ||
844 | dvnode = AFS_FS_I(dir); | |
845 | ||
416351f2 | 846 | _enter("{%x:%u},{%s}", |
260a9803 DH |
847 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
848 | ||
849 | ret = -ENAMETOOLONG; | |
45222b9e | 850 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
851 | goto error; |
852 | ||
853 | key = afs_request_key(dvnode->volume->cell); | |
854 | if (IS_ERR(key)) { | |
855 | ret = PTR_ERR(key); | |
856 | goto error; | |
857 | } | |
858 | ||
859 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); | |
860 | if (ret < 0) | |
861 | goto rmdir_error; | |
862 | ||
863 | if (dentry->d_inode) { | |
864 | vnode = AFS_FS_I(dentry->d_inode); | |
865 | clear_nlink(&vnode->vfs_inode); | |
866 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
867 | afs_discard_callback_on_delete(vnode); | |
868 | } | |
869 | ||
870 | key_put(key); | |
871 | _leave(" = 0"); | |
872 | return 0; | |
873 | ||
874 | rmdir_error: | |
875 | key_put(key); | |
876 | error: | |
877 | _leave(" = %d", ret); | |
878 | return ret; | |
879 | } | |
880 | ||
881 | /* | |
882 | * remove a file from an AFS filesystem | |
883 | */ | |
884 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
885 | { | |
886 | struct afs_vnode *dvnode, *vnode; | |
887 | struct key *key; | |
888 | int ret; | |
889 | ||
890 | dvnode = AFS_FS_I(dir); | |
891 | ||
416351f2 | 892 | _enter("{%x:%u},{%s}", |
260a9803 DH |
893 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); |
894 | ||
895 | ret = -ENAMETOOLONG; | |
45222b9e | 896 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
897 | goto error; |
898 | ||
899 | key = afs_request_key(dvnode->volume->cell); | |
900 | if (IS_ERR(key)) { | |
901 | ret = PTR_ERR(key); | |
902 | goto error; | |
903 | } | |
904 | ||
905 | if (dentry->d_inode) { | |
906 | vnode = AFS_FS_I(dentry->d_inode); | |
907 | ||
908 | /* make sure we have a callback promise on the victim */ | |
909 | ret = afs_validate(vnode, key); | |
910 | if (ret < 0) | |
911 | goto error; | |
912 | } | |
913 | ||
914 | ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); | |
915 | if (ret < 0) | |
916 | goto remove_error; | |
917 | ||
918 | if (dentry->d_inode) { | |
919 | /* if the file wasn't deleted due to excess hard links, the | |
920 | * fileserver will break the callback promise on the file - if | |
921 | * it had one - before it returns to us, and if it was deleted, | |
922 | * it won't | |
923 | * | |
924 | * however, if we didn't have a callback promise outstanding, | |
925 | * or it was outstanding on a different server, then it won't | |
926 | * break it either... | |
927 | */ | |
928 | vnode = AFS_FS_I(dentry->d_inode); | |
929 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
930 | _debug("AFS_VNODE_DELETED"); | |
931 | if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) | |
932 | _debug("AFS_VNODE_CB_BROKEN"); | |
933 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
934 | ret = afs_validate(vnode, key); | |
935 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
936 | } | |
937 | ||
938 | key_put(key); | |
939 | _leave(" = 0"); | |
940 | return 0; | |
941 | ||
942 | remove_error: | |
943 | key_put(key); | |
944 | error: | |
945 | _leave(" = %d", ret); | |
946 | return ret; | |
947 | } | |
948 | ||
949 | /* | |
950 | * create a regular file on an AFS filesystem | |
951 | */ | |
952 | static int afs_create(struct inode *dir, struct dentry *dentry, int mode, | |
953 | struct nameidata *nd) | |
954 | { | |
955 | struct afs_file_status status; | |
956 | struct afs_callback cb; | |
957 | struct afs_server *server; | |
958 | struct afs_vnode *dvnode, *vnode; | |
959 | struct afs_fid fid; | |
960 | struct inode *inode; | |
961 | struct key *key; | |
962 | int ret; | |
963 | ||
964 | dvnode = AFS_FS_I(dir); | |
965 | ||
416351f2 | 966 | _enter("{%x:%u},{%s},%o,", |
260a9803 DH |
967 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); |
968 | ||
969 | ret = -ENAMETOOLONG; | |
45222b9e | 970 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
971 | goto error; |
972 | ||
973 | key = afs_request_key(dvnode->volume->cell); | |
974 | if (IS_ERR(key)) { | |
975 | ret = PTR_ERR(key); | |
976 | goto error; | |
977 | } | |
978 | ||
979 | mode |= S_IFREG; | |
980 | ret = afs_vnode_create(dvnode, key, dentry->d_name.name, | |
981 | mode, &fid, &status, &cb, &server); | |
982 | if (ret < 0) | |
983 | goto create_error; | |
984 | ||
985 | inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); | |
986 | if (IS_ERR(inode)) { | |
987 | /* ENOMEM at a really inconvenient time - just abandon the new | |
988 | * directory on the server */ | |
989 | ret = PTR_ERR(inode); | |
990 | goto iget_error; | |
991 | } | |
992 | ||
993 | /* apply the status report we've got for the new vnode */ | |
994 | vnode = AFS_FS_I(inode); | |
995 | spin_lock(&vnode->lock); | |
996 | vnode->update_cnt++; | |
997 | spin_unlock(&vnode->lock); | |
998 | afs_vnode_finalise_status_update(vnode, server); | |
999 | afs_put_server(server); | |
1000 | ||
1001 | d_instantiate(dentry, inode); | |
1002 | if (d_unhashed(dentry)) { | |
1003 | _debug("not hashed"); | |
1004 | d_rehash(dentry); | |
1005 | } | |
1006 | key_put(key); | |
1007 | _leave(" = 0"); | |
1008 | return 0; | |
1009 | ||
1010 | iget_error: | |
1011 | afs_put_server(server); | |
1012 | create_error: | |
1013 | key_put(key); | |
1014 | error: | |
1015 | d_drop(dentry); | |
1016 | _leave(" = %d", ret); | |
1017 | return ret; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * create a hard link between files in an AFS filesystem | |
1022 | */ | |
1023 | static int afs_link(struct dentry *from, struct inode *dir, | |
1024 | struct dentry *dentry) | |
1025 | { | |
1026 | struct afs_vnode *dvnode, *vnode; | |
1027 | struct key *key; | |
1028 | int ret; | |
1029 | ||
1030 | vnode = AFS_FS_I(from->d_inode); | |
1031 | dvnode = AFS_FS_I(dir); | |
1032 | ||
416351f2 | 1033 | _enter("{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
1034 | vnode->fid.vid, vnode->fid.vnode, |
1035 | dvnode->fid.vid, dvnode->fid.vnode, | |
1036 | dentry->d_name.name); | |
1037 | ||
1038 | ret = -ENAMETOOLONG; | |
45222b9e | 1039 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1040 | goto error; |
1041 | ||
1042 | key = afs_request_key(dvnode->volume->cell); | |
1043 | if (IS_ERR(key)) { | |
1044 | ret = PTR_ERR(key); | |
1045 | goto error; | |
1046 | } | |
1047 | ||
1048 | ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); | |
1049 | if (ret < 0) | |
1050 | goto link_error; | |
1051 | ||
7de9c6ee | 1052 | ihold(&vnode->vfs_inode); |
260a9803 DH |
1053 | d_instantiate(dentry, &vnode->vfs_inode); |
1054 | key_put(key); | |
1055 | _leave(" = 0"); | |
1056 | return 0; | |
1057 | ||
1058 | link_error: | |
1059 | key_put(key); | |
1060 | error: | |
1061 | d_drop(dentry); | |
1062 | _leave(" = %d", ret); | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * create a symlink in an AFS filesystem | |
1068 | */ | |
1069 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1070 | const char *content) | |
1071 | { | |
1072 | struct afs_file_status status; | |
1073 | struct afs_server *server; | |
1074 | struct afs_vnode *dvnode, *vnode; | |
1075 | struct afs_fid fid; | |
1076 | struct inode *inode; | |
1077 | struct key *key; | |
1078 | int ret; | |
1079 | ||
1080 | dvnode = AFS_FS_I(dir); | |
1081 | ||
416351f2 | 1082 | _enter("{%x:%u},{%s},%s", |
260a9803 DH |
1083 | dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, |
1084 | content); | |
1085 | ||
1086 | ret = -ENAMETOOLONG; | |
45222b9e | 1087 | if (dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1088 | goto error; |
1089 | ||
1090 | ret = -EINVAL; | |
45222b9e | 1091 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1092 | goto error; |
1093 | ||
1094 | key = afs_request_key(dvnode->volume->cell); | |
1095 | if (IS_ERR(key)) { | |
1096 | ret = PTR_ERR(key); | |
1097 | goto error; | |
1098 | } | |
1099 | ||
1100 | ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, | |
1101 | &fid, &status, &server); | |
1102 | if (ret < 0) | |
1103 | goto create_error; | |
1104 | ||
1105 | inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); | |
1106 | if (IS_ERR(inode)) { | |
1107 | /* ENOMEM at a really inconvenient time - just abandon the new | |
1108 | * directory on the server */ | |
1109 | ret = PTR_ERR(inode); | |
1110 | goto iget_error; | |
1111 | } | |
1112 | ||
1113 | /* apply the status report we've got for the new vnode */ | |
1114 | vnode = AFS_FS_I(inode); | |
1115 | spin_lock(&vnode->lock); | |
1116 | vnode->update_cnt++; | |
1117 | spin_unlock(&vnode->lock); | |
1118 | afs_vnode_finalise_status_update(vnode, server); | |
1119 | afs_put_server(server); | |
1120 | ||
1121 | d_instantiate(dentry, inode); | |
1122 | if (d_unhashed(dentry)) { | |
1123 | _debug("not hashed"); | |
1124 | d_rehash(dentry); | |
1125 | } | |
1126 | key_put(key); | |
1127 | _leave(" = 0"); | |
1128 | return 0; | |
1129 | ||
1130 | iget_error: | |
1131 | afs_put_server(server); | |
1132 | create_error: | |
1133 | key_put(key); | |
1134 | error: | |
1135 | d_drop(dentry); | |
1136 | _leave(" = %d", ret); | |
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * rename a file in an AFS filesystem and/or move it between directories | |
1142 | */ | |
1143 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1144 | struct inode *new_dir, struct dentry *new_dentry) | |
1145 | { | |
1146 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; | |
1147 | struct key *key; | |
1148 | int ret; | |
1149 | ||
1150 | vnode = AFS_FS_I(old_dentry->d_inode); | |
1151 | orig_dvnode = AFS_FS_I(old_dir); | |
1152 | new_dvnode = AFS_FS_I(new_dir); | |
1153 | ||
416351f2 | 1154 | _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", |
260a9803 DH |
1155 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1156 | vnode->fid.vid, vnode->fid.vnode, | |
1157 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
1158 | new_dentry->d_name.name); | |
1159 | ||
1160 | ret = -ENAMETOOLONG; | |
45222b9e | 1161 | if (new_dentry->d_name.len >= AFSNAMEMAX) |
260a9803 DH |
1162 | goto error; |
1163 | ||
1164 | key = afs_request_key(orig_dvnode->volume->cell); | |
1165 | if (IS_ERR(key)) { | |
1166 | ret = PTR_ERR(key); | |
1167 | goto error; | |
1168 | } | |
1169 | ||
1170 | ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, | |
1171 | old_dentry->d_name.name, | |
1172 | new_dentry->d_name.name); | |
1173 | if (ret < 0) | |
1174 | goto rename_error; | |
1175 | key_put(key); | |
1176 | _leave(" = 0"); | |
1177 | return 0; | |
1178 | ||
1179 | rename_error: | |
1180 | key_put(key); | |
1181 | error: | |
1182 | d_drop(new_dentry); | |
1183 | _leave(" = %d", ret); | |
1184 | return ret; | |
1185 | } |