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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 | 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 | 22 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 23 | unsigned int flags); |
1da177e4 | 24 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 25 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 26 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 27 | static int afs_d_delete(const struct dentry *dentry); |
260a9803 | 28 | static void afs_d_release(struct dentry *dentry); |
ac7576f4 | 29 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 30 | loff_t fpos, u64 ino, unsigned dtype); |
4acdaf27 | 31 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 32 | bool excl); |
18bb1db3 | 33 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
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, | |
1cd66c93 MS |
41 | struct inode *new_dir, struct dentry *new_dentry, |
42 | unsigned int flags); | |
1da177e4 | 43 | |
4b6f5d20 | 44 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 45 | .open = afs_dir_open, |
00d3b7a4 | 46 | .release = afs_release, |
29884eff | 47 | .iterate_shared = afs_readdir, |
e8d6c554 | 48 | .lock = afs_lock, |
3222a3e5 | 49 | .llseek = generic_file_llseek, |
1da177e4 LT |
50 | }; |
51 | ||
754661f1 | 52 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
53 | .create = afs_create, |
54 | .lookup = afs_lookup, | |
55 | .link = afs_link, | |
56 | .unlink = afs_unlink, | |
57 | .symlink = afs_symlink, | |
58 | .mkdir = afs_mkdir, | |
59 | .rmdir = afs_rmdir, | |
2773bf00 | 60 | .rename = afs_rename, |
00d3b7a4 | 61 | .permission = afs_permission, |
416351f2 | 62 | .getattr = afs_getattr, |
31143d5d | 63 | .setattr = afs_setattr, |
d3e3b7ea | 64 | .listxattr = afs_listxattr, |
1da177e4 LT |
65 | }; |
66 | ||
d61dcce2 | 67 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
68 | .d_revalidate = afs_d_revalidate, |
69 | .d_delete = afs_d_delete, | |
260a9803 | 70 | .d_release = afs_d_release, |
d18610b0 | 71 | .d_automount = afs_d_automount, |
1da177e4 LT |
72 | }; |
73 | ||
74 | #define AFS_DIR_HASHTBL_SIZE 128 | |
75 | #define AFS_DIR_DIRENT_SIZE 32 | |
76 | #define AFS_DIRENT_PER_BLOCK 64 | |
77 | ||
78 | union afs_dirent { | |
79 | struct { | |
80 | uint8_t valid; | |
81 | uint8_t unused[1]; | |
82 | __be16 hash_next; | |
83 | __be32 vnode; | |
84 | __be32 unique; | |
85 | uint8_t name[16]; | |
86 | uint8_t overflow[4]; /* if any char of the name (inc | |
87 | * NUL) reaches here, consume | |
88 | * the next dirent too */ | |
89 | } u; | |
90 | uint8_t extended_name[32]; | |
91 | }; | |
92 | ||
93 | /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ | |
94 | struct afs_dir_pagehdr { | |
95 | __be16 npages; | |
96 | __be16 magic; | |
97 | #define AFS_DIR_MAGIC htons(1234) | |
98 | uint8_t nentries; | |
99 | uint8_t bitmap[8]; | |
100 | uint8_t pad[19]; | |
101 | }; | |
102 | ||
103 | /* directory block layout */ | |
104 | union afs_dir_block { | |
105 | ||
106 | struct afs_dir_pagehdr pagehdr; | |
107 | ||
108 | struct { | |
109 | struct afs_dir_pagehdr pagehdr; | |
110 | uint8_t alloc_ctrs[128]; | |
111 | /* dir hash table */ | |
112 | uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; | |
113 | } hdr; | |
114 | ||
115 | union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; | |
116 | }; | |
117 | ||
118 | /* layout on a linux VM page */ | |
119 | struct afs_dir_page { | |
120 | union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; | |
121 | }; | |
122 | ||
260a9803 | 123 | struct afs_lookup_cookie { |
1bbae9f8 | 124 | struct dir_context ctx; |
1da177e4 | 125 | struct afs_fid fid; |
1bbae9f8 | 126 | struct qstr name; |
1da177e4 LT |
127 | int found; |
128 | }; | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * check that a directory page is valid | |
132 | */ | |
be5b82db | 133 | static inline bool afs_dir_check_page(struct inode *dir, struct page *page) |
1da177e4 LT |
134 | { |
135 | struct afs_dir_page *dbuf; | |
136 | loff_t latter; | |
137 | int tmp, qty; | |
138 | ||
139 | #if 0 | |
140 | /* check the page count */ | |
141 | qty = desc.size / sizeof(dbuf->blocks[0]); | |
142 | if (qty == 0) | |
143 | goto error; | |
144 | ||
08e0e7c8 | 145 | if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
1da177e4 | 146 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
530b6412 | 147 | __func__, dir->i_ino, qty, |
08e0e7c8 | 148 | ntohs(dbuf->blocks[0].pagehdr.npages)); |
1da177e4 LT |
149 | goto error; |
150 | } | |
151 | #endif | |
152 | ||
153 | /* determine how many magic numbers there should be in this page */ | |
54b21a79 | 154 | latter = dir->i_size - page_offset(page); |
1da177e4 LT |
155 | if (latter >= PAGE_SIZE) |
156 | qty = PAGE_SIZE; | |
157 | else | |
158 | qty = latter; | |
159 | qty /= sizeof(union afs_dir_block); | |
160 | ||
161 | /* check them */ | |
162 | dbuf = page_address(page); | |
163 | for (tmp = 0; tmp < qty; tmp++) { | |
164 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
165 | printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", | |
530b6412 | 166 | __func__, dir->i_ino, tmp, qty, |
1da177e4 LT |
167 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
168 | goto error; | |
169 | } | |
170 | } | |
171 | ||
172 | SetPageChecked(page); | |
be5b82db | 173 | return true; |
1da177e4 | 174 | |
ec26815a | 175 | error: |
1da177e4 | 176 | SetPageError(page); |
be5b82db | 177 | return false; |
ec26815a | 178 | } |
1da177e4 | 179 | |
1da177e4 LT |
180 | /* |
181 | * discard a page cached in the pagecache | |
182 | */ | |
183 | static inline void afs_dir_put_page(struct page *page) | |
184 | { | |
185 | kunmap(page); | |
09cbfeaf | 186 | put_page(page); |
ec26815a | 187 | } |
1da177e4 | 188 | |
1da177e4 LT |
189 | /* |
190 | * get a page into the pagecache | |
191 | */ | |
00d3b7a4 DH |
192 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
193 | struct key *key) | |
1da177e4 LT |
194 | { |
195 | struct page *page; | |
1da177e4 LT |
196 | _enter("{%lu},%lu", dir->i_ino, index); |
197 | ||
f6d335c0 | 198 | page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
1da177e4 | 199 | if (!IS_ERR(page)) { |
1da177e4 | 200 | kmap(page); |
be5b82db AV |
201 | if (unlikely(!PageChecked(page))) { |
202 | if (PageError(page) || !afs_dir_check_page(dir, page)) | |
203 | goto fail; | |
204 | } | |
1da177e4 LT |
205 | } |
206 | return page; | |
207 | ||
ec26815a | 208 | fail: |
1da177e4 | 209 | afs_dir_put_page(page); |
08e0e7c8 | 210 | _leave(" = -EIO"); |
1da177e4 | 211 | return ERR_PTR(-EIO); |
ec26815a | 212 | } |
1da177e4 | 213 | |
1da177e4 LT |
214 | /* |
215 | * open an AFS directory file | |
216 | */ | |
217 | static int afs_dir_open(struct inode *inode, struct file *file) | |
218 | { | |
219 | _enter("{%lu}", inode->i_ino); | |
220 | ||
2ecd05ae AD |
221 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
222 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 223 | |
08e0e7c8 | 224 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
225 | return -ENOENT; |
226 | ||
00d3b7a4 | 227 | return afs_open(inode, file); |
ec26815a | 228 | } |
1da177e4 | 229 | |
1da177e4 LT |
230 | /* |
231 | * deal with one block in an AFS directory | |
232 | */ | |
1bbae9f8 | 233 | static int afs_dir_iterate_block(struct dir_context *ctx, |
1da177e4 | 234 | union afs_dir_block *block, |
1bbae9f8 | 235 | unsigned blkoff) |
1da177e4 LT |
236 | { |
237 | union afs_dirent *dire; | |
238 | unsigned offset, next, curr; | |
239 | size_t nlen; | |
1bbae9f8 | 240 | int tmp; |
1da177e4 | 241 | |
1bbae9f8 | 242 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 243 | |
1bbae9f8 | 244 | curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); |
1da177e4 LT |
245 | |
246 | /* walk through the block, an entry at a time */ | |
247 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
248 | offset < AFS_DIRENT_PER_BLOCK; | |
249 | offset = next | |
250 | ) { | |
251 | next = offset + 1; | |
252 | ||
253 | /* skip entries marked unused in the bitmap */ | |
254 | if (!(block->pagehdr.bitmap[offset / 8] & | |
255 | (1 << (offset % 8)))) { | |
5b5e0928 | 256 | _debug("ENT[%zu.%u]: unused", |
1da177e4 LT |
257 | blkoff / sizeof(union afs_dir_block), offset); |
258 | if (offset >= curr) | |
1bbae9f8 | 259 | ctx->pos = blkoff + |
1da177e4 LT |
260 | next * sizeof(union afs_dirent); |
261 | continue; | |
262 | } | |
263 | ||
264 | /* got a valid entry */ | |
265 | dire = &block->dirents[offset]; | |
266 | nlen = strnlen(dire->u.name, | |
267 | sizeof(*block) - | |
268 | offset * sizeof(union afs_dirent)); | |
269 | ||
5b5e0928 | 270 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
1da177e4 LT |
271 | blkoff / sizeof(union afs_dir_block), offset, |
272 | (offset < curr ? "skip" : "fill"), | |
273 | nlen, dire->u.name); | |
274 | ||
275 | /* work out where the next possible entry is */ | |
276 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
277 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
5b5e0928 | 278 | _debug("ENT[%zu.%u]:" |
1da177e4 | 279 | " %u travelled beyond end dir block" |
5b5e0928 | 280 | " (len %u/%zu)", |
1da177e4 LT |
281 | blkoff / sizeof(union afs_dir_block), |
282 | offset, next, tmp, nlen); | |
283 | return -EIO; | |
284 | } | |
285 | if (!(block->pagehdr.bitmap[next / 8] & | |
286 | (1 << (next % 8)))) { | |
5b5e0928 AD |
287 | _debug("ENT[%zu.%u]:" |
288 | " %u unmarked extension (len %u/%zu)", | |
1da177e4 LT |
289 | blkoff / sizeof(union afs_dir_block), |
290 | offset, next, tmp, nlen); | |
291 | return -EIO; | |
292 | } | |
293 | ||
5b5e0928 | 294 | _debug("ENT[%zu.%u]: ext %u/%zu", |
1da177e4 LT |
295 | blkoff / sizeof(union afs_dir_block), |
296 | next, tmp, nlen); | |
297 | next++; | |
298 | } | |
299 | ||
300 | /* skip if starts before the current position */ | |
301 | if (offset < curr) | |
302 | continue; | |
303 | ||
304 | /* found the next entry */ | |
1bbae9f8 | 305 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 306 | ntohl(dire->u.vnode), |
1bbae9f8 AV |
307 | ctx->actor == afs_lookup_filldir ? |
308 | ntohl(dire->u.unique) : DT_UNKNOWN)) { | |
1da177e4 LT |
309 | _leave(" = 0 [full]"); |
310 | return 0; | |
311 | } | |
312 | ||
1bbae9f8 | 313 | ctx->pos = blkoff + next * sizeof(union afs_dirent); |
1da177e4 LT |
314 | } |
315 | ||
316 | _leave(" = 1 [more]"); | |
317 | return 1; | |
ec26815a | 318 | } |
1da177e4 | 319 | |
1da177e4 | 320 | /* |
08e0e7c8 | 321 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 322 | */ |
1bbae9f8 AV |
323 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
324 | struct key *key) | |
1da177e4 | 325 | { |
08e0e7c8 | 326 | union afs_dir_block *dblock; |
1da177e4 LT |
327 | struct afs_dir_page *dbuf; |
328 | struct page *page; | |
329 | unsigned blkoff, limit; | |
330 | int ret; | |
331 | ||
1bbae9f8 | 332 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 333 | |
08e0e7c8 | 334 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
335 | _leave(" = -ESTALE"); |
336 | return -ESTALE; | |
337 | } | |
338 | ||
339 | /* round the file position up to the next entry boundary */ | |
1bbae9f8 AV |
340 | ctx->pos += sizeof(union afs_dirent) - 1; |
341 | ctx->pos &= ~(sizeof(union afs_dirent) - 1); | |
1da177e4 LT |
342 | |
343 | /* walk through the blocks in sequence */ | |
344 | ret = 0; | |
1bbae9f8 AV |
345 | while (ctx->pos < dir->i_size) { |
346 | blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); | |
1da177e4 LT |
347 | |
348 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 349 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
350 | if (IS_ERR(page)) { |
351 | ret = PTR_ERR(page); | |
352 | break; | |
353 | } | |
354 | ||
355 | limit = blkoff & ~(PAGE_SIZE - 1); | |
356 | ||
357 | dbuf = page_address(page); | |
358 | ||
359 | /* deal with the individual blocks stashed on this page */ | |
360 | do { | |
361 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
362 | sizeof(union afs_dir_block)]; | |
1bbae9f8 | 363 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 LT |
364 | if (ret != 1) { |
365 | afs_dir_put_page(page); | |
366 | goto out; | |
367 | } | |
368 | ||
369 | blkoff += sizeof(union afs_dir_block); | |
370 | ||
1bbae9f8 | 371 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 LT |
372 | |
373 | afs_dir_put_page(page); | |
374 | ret = 0; | |
375 | } | |
376 | ||
ec26815a | 377 | out: |
1da177e4 LT |
378 | _leave(" = %d", ret); |
379 | return ret; | |
ec26815a | 380 | } |
1da177e4 | 381 | |
1da177e4 LT |
382 | /* |
383 | * read an AFS directory | |
384 | */ | |
1bbae9f8 | 385 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 386 | { |
c435ee34 | 387 | return afs_dir_iterate(file_inode(file), |
1bbae9f8 | 388 | ctx, file->private_data); |
ec26815a | 389 | } |
1da177e4 | 390 | |
1da177e4 LT |
391 | /* |
392 | * search the directory for a name | |
393 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
394 | * uniquifier through dtype | |
395 | */ | |
ac7576f4 MS |
396 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, |
397 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 398 | { |
ac7576f4 MS |
399 | struct afs_lookup_cookie *cookie = |
400 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
1da177e4 | 401 | |
1bbae9f8 AV |
402 | _enter("{%s,%u},%s,%u,,%llu,%u", |
403 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 404 | (unsigned long long) ino, dtype); |
1da177e4 | 405 | |
08e0e7c8 DH |
406 | /* insanity checks first */ |
407 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
408 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
409 | ||
1bbae9f8 AV |
410 | if (cookie->name.len != nlen || |
411 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
412 | _leave(" = 0 [no]"); |
413 | return 0; | |
414 | } | |
415 | ||
416 | cookie->fid.vnode = ino; | |
417 | cookie->fid.unique = dtype; | |
418 | cookie->found = 1; | |
419 | ||
420 | _leave(" = -1 [found]"); | |
421 | return -1; | |
ec26815a | 422 | } |
1da177e4 | 423 | |
1da177e4 | 424 | /* |
08e0e7c8 | 425 | * do a lookup in a directory |
260a9803 | 426 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 427 | */ |
08e0e7c8 | 428 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 429 | struct afs_fid *fid, struct key *key) |
1da177e4 | 430 | { |
1bbae9f8 AV |
431 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
432 | struct afs_lookup_cookie cookie = { | |
433 | .ctx.actor = afs_lookup_filldir, | |
434 | .name = dentry->d_name, | |
435 | .fid.vid = as->volume->vid | |
436 | }; | |
1da177e4 LT |
437 | int ret; |
438 | ||
a455589f | 439 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 440 | |
1da177e4 | 441 | /* search the directory */ |
1bbae9f8 | 442 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 443 | if (ret < 0) { |
08e0e7c8 DH |
444 | _leave(" = %d [iter]", ret); |
445 | return ret; | |
1da177e4 LT |
446 | } |
447 | ||
448 | ret = -ENOENT; | |
449 | if (!cookie.found) { | |
08e0e7c8 DH |
450 | _leave(" = -ENOENT [not found]"); |
451 | return -ENOENT; | |
1da177e4 LT |
452 | } |
453 | ||
08e0e7c8 DH |
454 | *fid = cookie.fid; |
455 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
456 | return 0; | |
457 | } | |
458 | ||
bec5eb61 | 459 | /* |
460 | * Try to auto mount the mountpoint with pseudo directory, if the autocell | |
461 | * operation is setted. | |
462 | */ | |
463 | static struct inode *afs_try_auto_mntpt( | |
464 | int ret, struct dentry *dentry, struct inode *dir, struct key *key, | |
465 | struct afs_fid *fid) | |
466 | { | |
467 | const char *devname = dentry->d_name.name; | |
468 | struct afs_vnode *vnode = AFS_FS_I(dir); | |
469 | struct inode *inode; | |
470 | ||
a455589f AV |
471 | _enter("%d, %p{%pd}, {%x:%u}, %p", |
472 | ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); | |
bec5eb61 | 473 | |
474 | if (ret != -ENOENT || | |
475 | !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) | |
476 | goto out; | |
477 | ||
478 | inode = afs_iget_autocell(dir, devname, strlen(devname), key); | |
479 | if (IS_ERR(inode)) { | |
480 | ret = PTR_ERR(inode); | |
481 | goto out; | |
482 | } | |
483 | ||
484 | *fid = AFS_FS_I(inode)->fid; | |
485 | _leave("= %p", inode); | |
486 | return inode; | |
487 | ||
488 | out: | |
489 | _leave("= %d", ret); | |
490 | return ERR_PTR(ret); | |
491 | } | |
492 | ||
08e0e7c8 DH |
493 | /* |
494 | * look up an entry in a directory | |
495 | */ | |
260a9803 | 496 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 497 | unsigned int flags) |
08e0e7c8 DH |
498 | { |
499 | struct afs_vnode *vnode; | |
500 | struct afs_fid fid; | |
501 | struct inode *inode; | |
00d3b7a4 | 502 | struct key *key; |
08e0e7c8 DH |
503 | int ret; |
504 | ||
260a9803 DH |
505 | vnode = AFS_FS_I(dir); |
506 | ||
a455589f AV |
507 | _enter("{%x:%u},%p{%pd},", |
508 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry); | |
260a9803 | 509 | |
2b0143b5 | 510 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 511 | |
45222b9e | 512 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
513 | _leave(" = -ENAMETOOLONG"); |
514 | return ERR_PTR(-ENAMETOOLONG); | |
515 | } | |
516 | ||
08e0e7c8 DH |
517 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
518 | _leave(" = -ESTALE"); | |
519 | return ERR_PTR(-ESTALE); | |
520 | } | |
521 | ||
00d3b7a4 DH |
522 | key = afs_request_key(vnode->volume->cell); |
523 | if (IS_ERR(key)) { | |
524 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 525 | return ERR_CAST(key); |
00d3b7a4 DH |
526 | } |
527 | ||
260a9803 DH |
528 | ret = afs_validate(vnode, key); |
529 | if (ret < 0) { | |
530 | key_put(key); | |
531 | _leave(" = %d [val]", ret); | |
532 | return ERR_PTR(ret); | |
533 | } | |
534 | ||
00d3b7a4 | 535 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 536 | if (ret < 0) { |
bec5eb61 | 537 | inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); |
538 | if (!IS_ERR(inode)) { | |
539 | key_put(key); | |
540 | goto success; | |
541 | } | |
542 | ||
543 | ret = PTR_ERR(inode); | |
00d3b7a4 | 544 | key_put(key); |
260a9803 DH |
545 | if (ret == -ENOENT) { |
546 | d_add(dentry, NULL); | |
547 | _leave(" = NULL [negative]"); | |
548 | return NULL; | |
549 | } | |
08e0e7c8 | 550 | _leave(" = %d [do]", ret); |
1da177e4 LT |
551 | return ERR_PTR(ret); |
552 | } | |
260a9803 | 553 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 554 | |
08e0e7c8 | 555 | /* instantiate the dentry */ |
d2ddc776 | 556 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL); |
00d3b7a4 | 557 | key_put(key); |
08e0e7c8 DH |
558 | if (IS_ERR(inode)) { |
559 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 560 | return ERR_CAST(inode); |
08e0e7c8 DH |
561 | } |
562 | ||
bec5eb61 | 563 | success: |
1da177e4 | 564 | d_add(dentry, inode); |
d6e43f75 | 565 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", |
08e0e7c8 DH |
566 | fid.vnode, |
567 | fid.unique, | |
2b0143b5 DH |
568 | d_inode(dentry)->i_ino, |
569 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
570 | |
571 | return NULL; | |
ec26815a | 572 | } |
1da177e4 | 573 | |
1da177e4 LT |
574 | /* |
575 | * check that a dentry lookup hit has found a valid entry | |
576 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
577 | * inode | |
1da177e4 | 578 | */ |
0b728e19 | 579 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 580 | { |
260a9803 | 581 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 582 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 583 | struct dentry *parent; |
c435ee34 | 584 | struct inode *inode; |
00d3b7a4 | 585 | struct key *key; |
260a9803 | 586 | void *dir_version; |
1da177e4 LT |
587 | int ret; |
588 | ||
0b728e19 | 589 | if (flags & LOOKUP_RCU) |
34286d66 NP |
590 | return -ECHILD; |
591 | ||
c435ee34 DH |
592 | if (d_really_is_positive(dentry)) { |
593 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
594 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
595 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 596 | vnode->flags); |
c435ee34 | 597 | } else { |
a455589f | 598 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 599 | } |
1da177e4 | 600 | |
260a9803 | 601 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
602 | if (IS_ERR(key)) |
603 | key = NULL; | |
604 | ||
c435ee34 DH |
605 | if (d_really_is_positive(dentry)) { |
606 | inode = d_inode(dentry); | |
607 | if (inode) { | |
608 | vnode = AFS_FS_I(inode); | |
609 | afs_validate(vnode, key); | |
610 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
611 | goto out_bad; | |
612 | } | |
613 | } | |
614 | ||
1da177e4 | 615 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 616 | parent = dget_parent(dentry); |
2b0143b5 | 617 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 618 | |
260a9803 | 619 | /* validate the parent directory */ |
c435ee34 | 620 | afs_validate(dir, key); |
260a9803 DH |
621 | |
622 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 623 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 624 | goto out_bad_parent; |
1da177e4 LT |
625 | } |
626 | ||
260a9803 DH |
627 | dir_version = (void *) (unsigned long) dir->status.data_version; |
628 | if (dentry->d_fsdata == dir_version) | |
629 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 630 | |
260a9803 DH |
631 | _debug("dir modified"); |
632 | ||
633 | /* search the directory for this vnode */ | |
634 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
635 | switch (ret) { | |
636 | case 0: | |
637 | /* the filename maps to something */ | |
2b0143b5 | 638 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
639 | goto out_bad_parent; |
640 | inode = d_inode(dentry); | |
641 | if (is_bad_inode(inode)) { | |
a455589f AV |
642 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
643 | dentry); | |
c435ee34 | 644 | goto out_bad_parent; |
1da177e4 LT |
645 | } |
646 | ||
c435ee34 DH |
647 | vnode = AFS_FS_I(inode); |
648 | ||
1da177e4 LT |
649 | /* if the vnode ID has changed, then the dirent points to a |
650 | * different file */ | |
08e0e7c8 | 651 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
652 | _debug("%pd: dirent changed [%u != %u]", |
653 | dentry, fid.vnode, | |
08e0e7c8 | 654 | vnode->fid.vnode); |
1da177e4 LT |
655 | goto not_found; |
656 | } | |
657 | ||
658 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
659 | * been deleted and replaced, and the original vnode ID has |
660 | * been reused */ | |
08e0e7c8 | 661 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
662 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
663 | dentry, fid.unique, | |
7a224228 | 664 | vnode->fid.unique, |
c435ee34 DH |
665 | vnode->vfs_inode.i_generation); |
666 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 667 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 668 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 669 | goto not_found; |
1da177e4 | 670 | } |
260a9803 | 671 | goto out_valid; |
08e0e7c8 | 672 | |
260a9803 DH |
673 | case -ENOENT: |
674 | /* the filename is unknown */ | |
a455589f | 675 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 676 | if (d_really_is_positive(dentry)) |
260a9803 DH |
677 | goto not_found; |
678 | goto out_valid; | |
1da177e4 | 679 | |
260a9803 | 680 | default: |
a455589f AV |
681 | _debug("failed to iterate dir %pd: %d", |
682 | parent, ret); | |
c435ee34 | 683 | goto out_bad_parent; |
08e0e7c8 DH |
684 | } |
685 | ||
ec26815a | 686 | out_valid: |
260a9803 | 687 | dentry->d_fsdata = dir_version; |
1da177e4 | 688 | dput(parent); |
00d3b7a4 | 689 | key_put(key); |
1da177e4 LT |
690 | _leave(" = 1 [valid]"); |
691 | return 1; | |
692 | ||
693 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 694 | not_found: |
1da177e4 LT |
695 | spin_lock(&dentry->d_lock); |
696 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
697 | spin_unlock(&dentry->d_lock); | |
698 | ||
c435ee34 | 699 | out_bad_parent: |
a455589f | 700 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 701 | dput(parent); |
c435ee34 | 702 | out_bad: |
00d3b7a4 | 703 | key_put(key); |
1da177e4 LT |
704 | |
705 | _leave(" = 0 [bad]"); | |
706 | return 0; | |
ec26815a | 707 | } |
1da177e4 | 708 | |
1da177e4 LT |
709 | /* |
710 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
711 | * sleep) | |
712 | * - called from dput() when d_count is going to 0. | |
713 | * - return 1 to request dentry be unhashed, 0 otherwise | |
714 | */ | |
fe15ce44 | 715 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 716 | { |
a455589f | 717 | _enter("%pd", dentry); |
1da177e4 LT |
718 | |
719 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
720 | goto zap; | |
721 | ||
2b0143b5 DH |
722 | if (d_really_is_positive(dentry) && |
723 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
724 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 725 | goto zap; |
1da177e4 LT |
726 | |
727 | _leave(" = 0 [keep]"); | |
728 | return 0; | |
729 | ||
ec26815a | 730 | zap: |
1da177e4 LT |
731 | _leave(" = 1 [zap]"); |
732 | return 1; | |
ec26815a | 733 | } |
260a9803 DH |
734 | |
735 | /* | |
736 | * handle dentry release | |
737 | */ | |
738 | static void afs_d_release(struct dentry *dentry) | |
739 | { | |
a455589f | 740 | _enter("%pd", dentry); |
260a9803 DH |
741 | } |
742 | ||
d2ddc776 DH |
743 | /* |
744 | * Create a new inode for create/mkdir/symlink | |
745 | */ | |
746 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
747 | struct dentry *new_dentry, | |
748 | struct afs_fid *newfid, | |
749 | struct afs_file_status *newstatus, | |
750 | struct afs_callback *newcb) | |
751 | { | |
752 | struct inode *inode; | |
753 | ||
754 | if (fc->ac.error < 0) | |
755 | return; | |
756 | ||
757 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, | |
758 | newfid, newstatus, newcb, fc->cbi); | |
759 | if (IS_ERR(inode)) { | |
760 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
761 | * the new directory on the server. | |
762 | */ | |
763 | fc->ac.error = PTR_ERR(inode); | |
764 | return; | |
765 | } | |
766 | ||
767 | d_instantiate(new_dentry, inode); | |
768 | if (d_unhashed(new_dentry)) | |
769 | d_rehash(new_dentry); | |
770 | } | |
771 | ||
260a9803 DH |
772 | /* |
773 | * create a directory on an AFS filesystem | |
774 | */ | |
18bb1db3 | 775 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 776 | { |
d2ddc776 DH |
777 | struct afs_file_status newstatus; |
778 | struct afs_fs_cursor fc; | |
779 | struct afs_callback newcb; | |
780 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
781 | struct afs_fid newfid; | |
260a9803 DH |
782 | struct key *key; |
783 | int ret; | |
784 | ||
d2ddc776 | 785 | mode |= S_IFDIR; |
260a9803 | 786 | |
a455589f AV |
787 | _enter("{%x:%u},{%pd},%ho", |
788 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 789 | |
260a9803 DH |
790 | key = afs_request_key(dvnode->volume->cell); |
791 | if (IS_ERR(key)) { | |
792 | ret = PTR_ERR(key); | |
793 | goto error; | |
794 | } | |
795 | ||
d2ddc776 DH |
796 | ret = -ERESTARTSYS; |
797 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
798 | while (afs_select_fileserver(&fc)) { | |
799 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
800 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
801 | &newfid, &newstatus, &newcb); | |
802 | } | |
260a9803 | 803 | |
d2ddc776 DH |
804 | afs_check_for_remote_deletion(&fc, fc.vnode); |
805 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
806 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
807 | ret = afs_end_vnode_operation(&fc); | |
808 | if (ret < 0) | |
809 | goto error_key; | |
260a9803 DH |
810 | } |
811 | ||
260a9803 DH |
812 | key_put(key); |
813 | _leave(" = 0"); | |
814 | return 0; | |
815 | ||
d2ddc776 | 816 | error_key: |
260a9803 DH |
817 | key_put(key); |
818 | error: | |
819 | d_drop(dentry); | |
820 | _leave(" = %d", ret); | |
821 | return ret; | |
822 | } | |
823 | ||
d2ddc776 DH |
824 | /* |
825 | * Remove a subdir from a directory. | |
826 | */ | |
827 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
828 | { | |
829 | if (d_really_is_positive(dentry)) { | |
830 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
831 | ||
832 | clear_nlink(&vnode->vfs_inode); | |
833 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
834 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
835 | } | |
836 | } | |
837 | ||
260a9803 DH |
838 | /* |
839 | * remove a directory from an AFS filesystem | |
840 | */ | |
841 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
842 | { | |
d2ddc776 DH |
843 | struct afs_fs_cursor fc; |
844 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 DH |
845 | struct key *key; |
846 | int ret; | |
847 | ||
a455589f AV |
848 | _enter("{%x:%u},{%pd}", |
849 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 850 | |
260a9803 DH |
851 | key = afs_request_key(dvnode->volume->cell); |
852 | if (IS_ERR(key)) { | |
853 | ret = PTR_ERR(key); | |
854 | goto error; | |
855 | } | |
856 | ||
d2ddc776 DH |
857 | ret = -ERESTARTSYS; |
858 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
859 | while (afs_select_fileserver(&fc)) { | |
860 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
861 | afs_fs_remove(&fc, dentry->d_name.name, true); | |
862 | } | |
260a9803 | 863 | |
d2ddc776 DH |
864 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
865 | ret = afs_end_vnode_operation(&fc); | |
866 | if (ret == 0) | |
867 | afs_dir_remove_subdir(dentry); | |
260a9803 DH |
868 | } |
869 | ||
870 | key_put(key); | |
260a9803 | 871 | error: |
260a9803 DH |
872 | return ret; |
873 | } | |
874 | ||
875 | /* | |
d2ddc776 DH |
876 | * Remove a link to a file or symlink from a directory. |
877 | * | |
878 | * If the file was not deleted due to excess hard links, the fileserver will | |
879 | * break the callback promise on the file - if it had one - before it returns | |
880 | * to us, and if it was deleted, it won't | |
881 | * | |
882 | * However, if we didn't have a callback promise outstanding, or it was | |
883 | * outstanding on a different server, then it won't break it either... | |
884 | */ | |
885 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key) | |
886 | { | |
887 | int ret = 0; | |
888 | ||
889 | if (d_really_is_positive(dentry)) { | |
890 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
891 | ||
892 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
893 | kdebug("AFS_VNODE_DELETED"); | |
894 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
895 | ||
896 | ret = afs_validate(vnode, key); | |
897 | if (ret == -ESTALE) | |
898 | ret = 0; | |
899 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
900 | } | |
901 | ||
902 | return ret; | |
903 | } | |
904 | ||
905 | /* | |
906 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
907 | */ |
908 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
909 | { | |
d2ddc776 DH |
910 | struct afs_fs_cursor fc; |
911 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 DH |
912 | struct key *key; |
913 | int ret; | |
914 | ||
a455589f AV |
915 | _enter("{%x:%u},{%pd}", |
916 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 917 | |
45222b9e | 918 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 919 | return -ENAMETOOLONG; |
260a9803 DH |
920 | |
921 | key = afs_request_key(dvnode->volume->cell); | |
922 | if (IS_ERR(key)) { | |
923 | ret = PTR_ERR(key); | |
924 | goto error; | |
925 | } | |
926 | ||
d2ddc776 | 927 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
928 | if (d_really_is_positive(dentry)) { |
929 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
930 | ret = afs_validate(vnode, key); |
931 | if (ret < 0) | |
d2ddc776 | 932 | goto error_key; |
260a9803 DH |
933 | } |
934 | ||
d2ddc776 DH |
935 | ret = -ERESTARTSYS; |
936 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
937 | while (afs_select_fileserver(&fc)) { | |
938 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
939 | afs_fs_remove(&fc, dentry->d_name.name, false); | |
940 | } | |
260a9803 | 941 | |
d2ddc776 DH |
942 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
943 | ret = afs_end_vnode_operation(&fc); | |
944 | if (ret == 0) | |
945 | ret = afs_dir_remove_link(dentry, key); | |
260a9803 DH |
946 | } |
947 | ||
d2ddc776 | 948 | error_key: |
260a9803 DH |
949 | key_put(key); |
950 | error: | |
951 | _leave(" = %d", ret); | |
952 | return ret; | |
953 | } | |
954 | ||
955 | /* | |
956 | * create a regular file on an AFS filesystem | |
957 | */ | |
4acdaf27 | 958 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 959 | bool excl) |
260a9803 | 960 | { |
d2ddc776 DH |
961 | struct afs_fs_cursor fc; |
962 | struct afs_file_status newstatus; | |
963 | struct afs_callback newcb; | |
964 | struct afs_vnode *dvnode = dvnode = AFS_FS_I(dir); | |
965 | struct afs_fid newfid; | |
260a9803 DH |
966 | struct key *key; |
967 | int ret; | |
968 | ||
d2ddc776 | 969 | mode |= S_IFREG; |
260a9803 | 970 | |
a455589f AV |
971 | _enter("{%x:%u},{%pd},%ho,", |
972 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 973 | |
d2ddc776 DH |
974 | ret = -ENAMETOOLONG; |
975 | if (dentry->d_name.len >= AFSNAMEMAX) | |
976 | goto error; | |
977 | ||
260a9803 DH |
978 | key = afs_request_key(dvnode->volume->cell); |
979 | if (IS_ERR(key)) { | |
980 | ret = PTR_ERR(key); | |
981 | goto error; | |
982 | } | |
983 | ||
d2ddc776 DH |
984 | ret = -ERESTARTSYS; |
985 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
986 | while (afs_select_fileserver(&fc)) { | |
987 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
988 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
989 | &newfid, &newstatus, &newcb); | |
990 | } | |
260a9803 | 991 | |
d2ddc776 DH |
992 | afs_check_for_remote_deletion(&fc, fc.vnode); |
993 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
994 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
995 | ret = afs_end_vnode_operation(&fc); | |
996 | if (ret < 0) | |
997 | goto error_key; | |
260a9803 DH |
998 | } |
999 | ||
260a9803 DH |
1000 | key_put(key); |
1001 | _leave(" = 0"); | |
1002 | return 0; | |
1003 | ||
d2ddc776 | 1004 | error_key: |
260a9803 DH |
1005 | key_put(key); |
1006 | error: | |
1007 | d_drop(dentry); | |
1008 | _leave(" = %d", ret); | |
1009 | return ret; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * create a hard link between files in an AFS filesystem | |
1014 | */ | |
1015 | static int afs_link(struct dentry *from, struct inode *dir, | |
1016 | struct dentry *dentry) | |
1017 | { | |
d2ddc776 | 1018 | struct afs_fs_cursor fc; |
260a9803 DH |
1019 | struct afs_vnode *dvnode, *vnode; |
1020 | struct key *key; | |
1021 | int ret; | |
1022 | ||
2b0143b5 | 1023 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 DH |
1024 | dvnode = AFS_FS_I(dir); |
1025 | ||
a455589f | 1026 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1027 | vnode->fid.vid, vnode->fid.vnode, |
1028 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1029 | dentry); |
260a9803 | 1030 | |
d2ddc776 DH |
1031 | ret = -ENAMETOOLONG; |
1032 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1033 | goto error; | |
1034 | ||
260a9803 DH |
1035 | key = afs_request_key(dvnode->volume->cell); |
1036 | if (IS_ERR(key)) { | |
1037 | ret = PTR_ERR(key); | |
1038 | goto error; | |
1039 | } | |
1040 | ||
d2ddc776 DH |
1041 | ret = -ERESTARTSYS; |
1042 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1043 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1044 | afs_end_vnode_operation(&fc); | |
1045 | return -ERESTARTSYS; | |
1046 | } | |
1047 | ||
1048 | while (afs_select_fileserver(&fc)) { | |
1049 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1050 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
1051 | afs_fs_link(&fc, vnode, dentry->d_name.name); | |
1052 | } | |
1053 | ||
1054 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1055 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1056 | ihold(&vnode->vfs_inode); | |
1057 | d_instantiate(dentry, &vnode->vfs_inode); | |
1058 | ||
1059 | mutex_unlock(&vnode->io_lock); | |
1060 | ret = afs_end_vnode_operation(&fc); | |
1061 | if (ret < 0) | |
1062 | goto error_key; | |
1063 | } | |
260a9803 | 1064 | |
260a9803 DH |
1065 | key_put(key); |
1066 | _leave(" = 0"); | |
1067 | return 0; | |
1068 | ||
d2ddc776 | 1069 | error_key: |
260a9803 DH |
1070 | key_put(key); |
1071 | error: | |
1072 | d_drop(dentry); | |
1073 | _leave(" = %d", ret); | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * create a symlink in an AFS filesystem | |
1079 | */ | |
1080 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1081 | const char *content) | |
1082 | { | |
d2ddc776 DH |
1083 | struct afs_fs_cursor fc; |
1084 | struct afs_file_status newstatus; | |
1085 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1086 | struct afs_fid newfid; | |
260a9803 DH |
1087 | struct key *key; |
1088 | int ret; | |
1089 | ||
a455589f AV |
1090 | _enter("{%x:%u},{%pd},%s", |
1091 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1092 | content); |
1093 | ||
d2ddc776 DH |
1094 | ret = -ENAMETOOLONG; |
1095 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1096 | goto error; | |
1097 | ||
260a9803 | 1098 | ret = -EINVAL; |
45222b9e | 1099 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1100 | goto error; |
1101 | ||
1102 | key = afs_request_key(dvnode->volume->cell); | |
1103 | if (IS_ERR(key)) { | |
1104 | ret = PTR_ERR(key); | |
1105 | goto error; | |
1106 | } | |
1107 | ||
d2ddc776 DH |
1108 | ret = -ERESTARTSYS; |
1109 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1110 | while (afs_select_fileserver(&fc)) { | |
1111 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1112 | afs_fs_symlink(&fc, dentry->d_name.name, content, | |
1113 | &newfid, &newstatus); | |
1114 | } | |
260a9803 | 1115 | |
d2ddc776 DH |
1116 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1117 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1118 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1119 | ret = afs_end_vnode_operation(&fc); | |
1120 | if (ret < 0) | |
1121 | goto error_key; | |
260a9803 DH |
1122 | } |
1123 | ||
260a9803 DH |
1124 | key_put(key); |
1125 | _leave(" = 0"); | |
1126 | return 0; | |
1127 | ||
d2ddc776 | 1128 | error_key: |
260a9803 DH |
1129 | key_put(key); |
1130 | error: | |
1131 | d_drop(dentry); | |
1132 | _leave(" = %d", ret); | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * rename a file in an AFS filesystem and/or move it between directories | |
1138 | */ | |
1139 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1140 | struct inode *new_dir, struct dentry *new_dentry, |
1141 | unsigned int flags) | |
260a9803 | 1142 | { |
d2ddc776 | 1143 | struct afs_fs_cursor fc; |
260a9803 DH |
1144 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1145 | struct key *key; | |
1146 | int ret; | |
1147 | ||
1cd66c93 MS |
1148 | if (flags) |
1149 | return -EINVAL; | |
1150 | ||
2b0143b5 | 1151 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1152 | orig_dvnode = AFS_FS_I(old_dir); |
1153 | new_dvnode = AFS_FS_I(new_dir); | |
1154 | ||
a455589f | 1155 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1156 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1157 | vnode->fid.vid, vnode->fid.vnode, | |
1158 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1159 | new_dentry); |
260a9803 | 1160 | |
260a9803 DH |
1161 | key = afs_request_key(orig_dvnode->volume->cell); |
1162 | if (IS_ERR(key)) { | |
1163 | ret = PTR_ERR(key); | |
1164 | goto error; | |
1165 | } | |
1166 | ||
d2ddc776 DH |
1167 | ret = -ERESTARTSYS; |
1168 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1169 | if (orig_dvnode != new_dvnode) { | |
1170 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1171 | afs_end_vnode_operation(&fc); | |
1172 | return -ERESTARTSYS; | |
1173 | } | |
1174 | } | |
1175 | while (afs_select_fileserver(&fc)) { | |
1176 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1177 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1178 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
1179 | new_dvnode, new_dentry->d_name.name); | |
1180 | } | |
1181 | ||
1182 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1183 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1184 | if (orig_dvnode != new_dvnode) | |
1185 | mutex_unlock(&new_dvnode->io_lock); | |
1186 | ret = afs_end_vnode_operation(&fc); | |
1187 | if (ret < 0) | |
1188 | goto error_key; | |
1189 | } | |
1190 | ||
260a9803 DH |
1191 | key_put(key); |
1192 | _leave(" = 0"); | |
1193 | return 0; | |
1194 | ||
d2ddc776 | 1195 | error_key: |
260a9803 DH |
1196 | key_put(key); |
1197 | error: | |
1198 | d_drop(new_dentry); | |
1199 | _leave(" = %d", ret); | |
1200 | return ret; | |
1201 | } |