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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 | */ | |
dab17c1a | 133 | bool afs_dir_check_page(struct inode *dir, struct page *page) |
1da177e4 LT |
134 | { |
135 | struct afs_dir_page *dbuf; | |
dab17c1a DH |
136 | struct afs_vnode *vnode = AFS_FS_I(dir); |
137 | loff_t latter, i_size, off; | |
1da177e4 LT |
138 | int tmp, qty; |
139 | ||
140 | #if 0 | |
141 | /* check the page count */ | |
142 | qty = desc.size / sizeof(dbuf->blocks[0]); | |
143 | if (qty == 0) | |
144 | goto error; | |
145 | ||
08e0e7c8 | 146 | if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
1da177e4 | 147 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
530b6412 | 148 | __func__, dir->i_ino, qty, |
08e0e7c8 | 149 | ntohs(dbuf->blocks[0].pagehdr.npages)); |
1da177e4 LT |
150 | goto error; |
151 | } | |
152 | #endif | |
153 | ||
dab17c1a DH |
154 | /* Determine how many magic numbers there should be in this page, but |
155 | * we must take care because the directory may change size under us. | |
156 | */ | |
157 | off = page_offset(page); | |
158 | i_size = i_size_read(dir); | |
159 | if (i_size <= off) | |
160 | goto checked; | |
161 | ||
162 | latter = i_size - off; | |
1da177e4 LT |
163 | if (latter >= PAGE_SIZE) |
164 | qty = PAGE_SIZE; | |
165 | else | |
166 | qty = latter; | |
167 | qty /= sizeof(union afs_dir_block); | |
168 | ||
169 | /* check them */ | |
170 | dbuf = page_address(page); | |
171 | for (tmp = 0; tmp < qty; tmp++) { | |
172 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
dab17c1a | 173 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
530b6412 | 174 | __func__, dir->i_ino, tmp, qty, |
1da177e4 | 175 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
dab17c1a | 176 | trace_afs_dir_check_failed(vnode, off, i_size); |
1da177e4 LT |
177 | goto error; |
178 | } | |
179 | } | |
180 | ||
dab17c1a | 181 | checked: |
1da177e4 | 182 | SetPageChecked(page); |
be5b82db | 183 | return true; |
1da177e4 | 184 | |
ec26815a | 185 | error: |
1da177e4 | 186 | SetPageError(page); |
be5b82db | 187 | return false; |
ec26815a | 188 | } |
1da177e4 | 189 | |
1da177e4 LT |
190 | /* |
191 | * discard a page cached in the pagecache | |
192 | */ | |
193 | static inline void afs_dir_put_page(struct page *page) | |
194 | { | |
195 | kunmap(page); | |
dab17c1a | 196 | unlock_page(page); |
09cbfeaf | 197 | put_page(page); |
ec26815a | 198 | } |
1da177e4 | 199 | |
1da177e4 LT |
200 | /* |
201 | * get a page into the pagecache | |
202 | */ | |
00d3b7a4 DH |
203 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
204 | struct key *key) | |
1da177e4 LT |
205 | { |
206 | struct page *page; | |
1da177e4 LT |
207 | _enter("{%lu},%lu", dir->i_ino, index); |
208 | ||
f6d335c0 | 209 | page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
1da177e4 | 210 | if (!IS_ERR(page)) { |
dab17c1a | 211 | lock_page(page); |
1da177e4 | 212 | kmap(page); |
be5b82db | 213 | if (unlikely(!PageChecked(page))) { |
dab17c1a | 214 | if (PageError(page)) |
be5b82db AV |
215 | goto fail; |
216 | } | |
1da177e4 LT |
217 | } |
218 | return page; | |
219 | ||
ec26815a | 220 | fail: |
1da177e4 | 221 | afs_dir_put_page(page); |
08e0e7c8 | 222 | _leave(" = -EIO"); |
1da177e4 | 223 | return ERR_PTR(-EIO); |
ec26815a | 224 | } |
1da177e4 | 225 | |
1da177e4 LT |
226 | /* |
227 | * open an AFS directory file | |
228 | */ | |
229 | static int afs_dir_open(struct inode *inode, struct file *file) | |
230 | { | |
231 | _enter("{%lu}", inode->i_ino); | |
232 | ||
2ecd05ae AD |
233 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
234 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 235 | |
08e0e7c8 | 236 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
237 | return -ENOENT; |
238 | ||
00d3b7a4 | 239 | return afs_open(inode, file); |
ec26815a | 240 | } |
1da177e4 | 241 | |
1da177e4 LT |
242 | /* |
243 | * deal with one block in an AFS directory | |
244 | */ | |
1bbae9f8 | 245 | static int afs_dir_iterate_block(struct dir_context *ctx, |
1da177e4 | 246 | union afs_dir_block *block, |
1bbae9f8 | 247 | unsigned blkoff) |
1da177e4 LT |
248 | { |
249 | union afs_dirent *dire; | |
250 | unsigned offset, next, curr; | |
251 | size_t nlen; | |
1bbae9f8 | 252 | int tmp; |
1da177e4 | 253 | |
1bbae9f8 | 254 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 255 | |
1bbae9f8 | 256 | curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); |
1da177e4 LT |
257 | |
258 | /* walk through the block, an entry at a time */ | |
259 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
260 | offset < AFS_DIRENT_PER_BLOCK; | |
261 | offset = next | |
262 | ) { | |
263 | next = offset + 1; | |
264 | ||
265 | /* skip entries marked unused in the bitmap */ | |
266 | if (!(block->pagehdr.bitmap[offset / 8] & | |
267 | (1 << (offset % 8)))) { | |
5b5e0928 | 268 | _debug("ENT[%zu.%u]: unused", |
1da177e4 LT |
269 | blkoff / sizeof(union afs_dir_block), offset); |
270 | if (offset >= curr) | |
1bbae9f8 | 271 | ctx->pos = blkoff + |
1da177e4 LT |
272 | next * sizeof(union afs_dirent); |
273 | continue; | |
274 | } | |
275 | ||
276 | /* got a valid entry */ | |
277 | dire = &block->dirents[offset]; | |
278 | nlen = strnlen(dire->u.name, | |
279 | sizeof(*block) - | |
280 | offset * sizeof(union afs_dirent)); | |
281 | ||
5b5e0928 | 282 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
1da177e4 LT |
283 | blkoff / sizeof(union afs_dir_block), offset, |
284 | (offset < curr ? "skip" : "fill"), | |
285 | nlen, dire->u.name); | |
286 | ||
287 | /* work out where the next possible entry is */ | |
288 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
289 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
5b5e0928 | 290 | _debug("ENT[%zu.%u]:" |
1da177e4 | 291 | " %u travelled beyond end dir block" |
5b5e0928 | 292 | " (len %u/%zu)", |
1da177e4 LT |
293 | blkoff / sizeof(union afs_dir_block), |
294 | offset, next, tmp, nlen); | |
295 | return -EIO; | |
296 | } | |
297 | if (!(block->pagehdr.bitmap[next / 8] & | |
298 | (1 << (next % 8)))) { | |
5b5e0928 AD |
299 | _debug("ENT[%zu.%u]:" |
300 | " %u unmarked extension (len %u/%zu)", | |
1da177e4 LT |
301 | blkoff / sizeof(union afs_dir_block), |
302 | offset, next, tmp, nlen); | |
303 | return -EIO; | |
304 | } | |
305 | ||
5b5e0928 | 306 | _debug("ENT[%zu.%u]: ext %u/%zu", |
1da177e4 LT |
307 | blkoff / sizeof(union afs_dir_block), |
308 | next, tmp, nlen); | |
309 | next++; | |
310 | } | |
311 | ||
312 | /* skip if starts before the current position */ | |
313 | if (offset < curr) | |
314 | continue; | |
315 | ||
316 | /* found the next entry */ | |
1bbae9f8 | 317 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 318 | ntohl(dire->u.vnode), |
1bbae9f8 AV |
319 | ctx->actor == afs_lookup_filldir ? |
320 | ntohl(dire->u.unique) : DT_UNKNOWN)) { | |
1da177e4 LT |
321 | _leave(" = 0 [full]"); |
322 | return 0; | |
323 | } | |
324 | ||
1bbae9f8 | 325 | ctx->pos = blkoff + next * sizeof(union afs_dirent); |
1da177e4 LT |
326 | } |
327 | ||
328 | _leave(" = 1 [more]"); | |
329 | return 1; | |
ec26815a | 330 | } |
1da177e4 | 331 | |
1da177e4 | 332 | /* |
08e0e7c8 | 333 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 334 | */ |
1bbae9f8 AV |
335 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
336 | struct key *key) | |
1da177e4 | 337 | { |
08e0e7c8 | 338 | union afs_dir_block *dblock; |
1da177e4 LT |
339 | struct afs_dir_page *dbuf; |
340 | struct page *page; | |
341 | unsigned blkoff, limit; | |
342 | int ret; | |
343 | ||
1bbae9f8 | 344 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 345 | |
08e0e7c8 | 346 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
347 | _leave(" = -ESTALE"); |
348 | return -ESTALE; | |
349 | } | |
350 | ||
351 | /* round the file position up to the next entry boundary */ | |
1bbae9f8 AV |
352 | ctx->pos += sizeof(union afs_dirent) - 1; |
353 | ctx->pos &= ~(sizeof(union afs_dirent) - 1); | |
1da177e4 LT |
354 | |
355 | /* walk through the blocks in sequence */ | |
356 | ret = 0; | |
1bbae9f8 AV |
357 | while (ctx->pos < dir->i_size) { |
358 | blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); | |
1da177e4 LT |
359 | |
360 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 361 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
362 | if (IS_ERR(page)) { |
363 | ret = PTR_ERR(page); | |
364 | break; | |
365 | } | |
366 | ||
367 | limit = blkoff & ~(PAGE_SIZE - 1); | |
368 | ||
369 | dbuf = page_address(page); | |
370 | ||
371 | /* deal with the individual blocks stashed on this page */ | |
372 | do { | |
373 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
374 | sizeof(union afs_dir_block)]; | |
1bbae9f8 | 375 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 LT |
376 | if (ret != 1) { |
377 | afs_dir_put_page(page); | |
378 | goto out; | |
379 | } | |
380 | ||
381 | blkoff += sizeof(union afs_dir_block); | |
382 | ||
1bbae9f8 | 383 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 LT |
384 | |
385 | afs_dir_put_page(page); | |
386 | ret = 0; | |
387 | } | |
388 | ||
ec26815a | 389 | out: |
1da177e4 LT |
390 | _leave(" = %d", ret); |
391 | return ret; | |
ec26815a | 392 | } |
1da177e4 | 393 | |
1da177e4 LT |
394 | /* |
395 | * read an AFS directory | |
396 | */ | |
1bbae9f8 | 397 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 398 | { |
215804a9 | 399 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 400 | } |
1da177e4 | 401 | |
1da177e4 LT |
402 | /* |
403 | * search the directory for a name | |
404 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
405 | * uniquifier through dtype | |
406 | */ | |
ac7576f4 MS |
407 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, |
408 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 409 | { |
ac7576f4 MS |
410 | struct afs_lookup_cookie *cookie = |
411 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
1da177e4 | 412 | |
1bbae9f8 AV |
413 | _enter("{%s,%u},%s,%u,,%llu,%u", |
414 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 415 | (unsigned long long) ino, dtype); |
1da177e4 | 416 | |
08e0e7c8 DH |
417 | /* insanity checks first */ |
418 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
419 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
420 | ||
1bbae9f8 AV |
421 | if (cookie->name.len != nlen || |
422 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
423 | _leave(" = 0 [no]"); |
424 | return 0; | |
425 | } | |
426 | ||
427 | cookie->fid.vnode = ino; | |
428 | cookie->fid.unique = dtype; | |
429 | cookie->found = 1; | |
430 | ||
431 | _leave(" = -1 [found]"); | |
432 | return -1; | |
ec26815a | 433 | } |
1da177e4 | 434 | |
1da177e4 | 435 | /* |
08e0e7c8 | 436 | * do a lookup in a directory |
260a9803 | 437 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 438 | */ |
08e0e7c8 | 439 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 440 | struct afs_fid *fid, struct key *key) |
1da177e4 | 441 | { |
1bbae9f8 AV |
442 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
443 | struct afs_lookup_cookie cookie = { | |
444 | .ctx.actor = afs_lookup_filldir, | |
445 | .name = dentry->d_name, | |
446 | .fid.vid = as->volume->vid | |
447 | }; | |
1da177e4 LT |
448 | int ret; |
449 | ||
a455589f | 450 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 451 | |
1da177e4 | 452 | /* search the directory */ |
1bbae9f8 | 453 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 454 | if (ret < 0) { |
08e0e7c8 DH |
455 | _leave(" = %d [iter]", ret); |
456 | return ret; | |
1da177e4 LT |
457 | } |
458 | ||
459 | ret = -ENOENT; | |
460 | if (!cookie.found) { | |
08e0e7c8 DH |
461 | _leave(" = -ENOENT [not found]"); |
462 | return -ENOENT; | |
1da177e4 LT |
463 | } |
464 | ||
08e0e7c8 DH |
465 | *fid = cookie.fid; |
466 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
467 | return 0; | |
468 | } | |
469 | ||
bec5eb61 | 470 | /* |
471 | * Try to auto mount the mountpoint with pseudo directory, if the autocell | |
472 | * operation is setted. | |
473 | */ | |
474 | static struct inode *afs_try_auto_mntpt( | |
475 | int ret, struct dentry *dentry, struct inode *dir, struct key *key, | |
476 | struct afs_fid *fid) | |
477 | { | |
478 | const char *devname = dentry->d_name.name; | |
479 | struct afs_vnode *vnode = AFS_FS_I(dir); | |
480 | struct inode *inode; | |
481 | ||
a455589f AV |
482 | _enter("%d, %p{%pd}, {%x:%u}, %p", |
483 | ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); | |
bec5eb61 | 484 | |
485 | if (ret != -ENOENT || | |
486 | !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) | |
487 | goto out; | |
488 | ||
489 | inode = afs_iget_autocell(dir, devname, strlen(devname), key); | |
490 | if (IS_ERR(inode)) { | |
491 | ret = PTR_ERR(inode); | |
492 | goto out; | |
493 | } | |
494 | ||
495 | *fid = AFS_FS_I(inode)->fid; | |
496 | _leave("= %p", inode); | |
497 | return inode; | |
498 | ||
499 | out: | |
500 | _leave("= %d", ret); | |
501 | return ERR_PTR(ret); | |
502 | } | |
503 | ||
08e0e7c8 DH |
504 | /* |
505 | * look up an entry in a directory | |
506 | */ | |
260a9803 | 507 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 508 | unsigned int flags) |
08e0e7c8 DH |
509 | { |
510 | struct afs_vnode *vnode; | |
511 | struct afs_fid fid; | |
512 | struct inode *inode; | |
00d3b7a4 | 513 | struct key *key; |
08e0e7c8 DH |
514 | int ret; |
515 | ||
260a9803 DH |
516 | vnode = AFS_FS_I(dir); |
517 | ||
a455589f AV |
518 | _enter("{%x:%u},%p{%pd},", |
519 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry); | |
260a9803 | 520 | |
2b0143b5 | 521 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 522 | |
45222b9e | 523 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
524 | _leave(" = -ENAMETOOLONG"); |
525 | return ERR_PTR(-ENAMETOOLONG); | |
526 | } | |
527 | ||
08e0e7c8 DH |
528 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
529 | _leave(" = -ESTALE"); | |
530 | return ERR_PTR(-ESTALE); | |
531 | } | |
532 | ||
00d3b7a4 DH |
533 | key = afs_request_key(vnode->volume->cell); |
534 | if (IS_ERR(key)) { | |
535 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 536 | return ERR_CAST(key); |
00d3b7a4 DH |
537 | } |
538 | ||
260a9803 DH |
539 | ret = afs_validate(vnode, key); |
540 | if (ret < 0) { | |
541 | key_put(key); | |
542 | _leave(" = %d [val]", ret); | |
543 | return ERR_PTR(ret); | |
544 | } | |
545 | ||
00d3b7a4 | 546 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 547 | if (ret < 0) { |
bec5eb61 | 548 | inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); |
549 | if (!IS_ERR(inode)) { | |
550 | key_put(key); | |
551 | goto success; | |
552 | } | |
553 | ||
554 | ret = PTR_ERR(inode); | |
00d3b7a4 | 555 | key_put(key); |
260a9803 DH |
556 | if (ret == -ENOENT) { |
557 | d_add(dentry, NULL); | |
558 | _leave(" = NULL [negative]"); | |
559 | return NULL; | |
560 | } | |
08e0e7c8 | 561 | _leave(" = %d [do]", ret); |
1da177e4 LT |
562 | return ERR_PTR(ret); |
563 | } | |
260a9803 | 564 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 565 | |
08e0e7c8 | 566 | /* instantiate the dentry */ |
d2ddc776 | 567 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL); |
00d3b7a4 | 568 | key_put(key); |
08e0e7c8 DH |
569 | if (IS_ERR(inode)) { |
570 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 571 | return ERR_CAST(inode); |
08e0e7c8 DH |
572 | } |
573 | ||
bec5eb61 | 574 | success: |
1da177e4 | 575 | d_add(dentry, inode); |
d6e43f75 | 576 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", |
08e0e7c8 DH |
577 | fid.vnode, |
578 | fid.unique, | |
2b0143b5 DH |
579 | d_inode(dentry)->i_ino, |
580 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
581 | |
582 | return NULL; | |
ec26815a | 583 | } |
1da177e4 | 584 | |
1da177e4 LT |
585 | /* |
586 | * check that a dentry lookup hit has found a valid entry | |
587 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
588 | * inode | |
1da177e4 | 589 | */ |
0b728e19 | 590 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 591 | { |
260a9803 | 592 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 593 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 594 | struct dentry *parent; |
c435ee34 | 595 | struct inode *inode; |
00d3b7a4 | 596 | struct key *key; |
260a9803 | 597 | void *dir_version; |
1da177e4 LT |
598 | int ret; |
599 | ||
0b728e19 | 600 | if (flags & LOOKUP_RCU) |
34286d66 NP |
601 | return -ECHILD; |
602 | ||
c435ee34 DH |
603 | if (d_really_is_positive(dentry)) { |
604 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
605 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
606 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 607 | vnode->flags); |
c435ee34 | 608 | } else { |
a455589f | 609 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 610 | } |
1da177e4 | 611 | |
260a9803 | 612 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
613 | if (IS_ERR(key)) |
614 | key = NULL; | |
615 | ||
c435ee34 DH |
616 | if (d_really_is_positive(dentry)) { |
617 | inode = d_inode(dentry); | |
618 | if (inode) { | |
619 | vnode = AFS_FS_I(inode); | |
620 | afs_validate(vnode, key); | |
621 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
622 | goto out_bad; | |
623 | } | |
624 | } | |
625 | ||
1da177e4 | 626 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 627 | parent = dget_parent(dentry); |
2b0143b5 | 628 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 629 | |
260a9803 | 630 | /* validate the parent directory */ |
c435ee34 | 631 | afs_validate(dir, key); |
260a9803 DH |
632 | |
633 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 634 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 635 | goto out_bad_parent; |
1da177e4 LT |
636 | } |
637 | ||
260a9803 DH |
638 | dir_version = (void *) (unsigned long) dir->status.data_version; |
639 | if (dentry->d_fsdata == dir_version) | |
640 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 641 | |
260a9803 DH |
642 | _debug("dir modified"); |
643 | ||
644 | /* search the directory for this vnode */ | |
645 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
646 | switch (ret) { | |
647 | case 0: | |
648 | /* the filename maps to something */ | |
2b0143b5 | 649 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
650 | goto out_bad_parent; |
651 | inode = d_inode(dentry); | |
652 | if (is_bad_inode(inode)) { | |
a455589f AV |
653 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
654 | dentry); | |
c435ee34 | 655 | goto out_bad_parent; |
1da177e4 LT |
656 | } |
657 | ||
c435ee34 DH |
658 | vnode = AFS_FS_I(inode); |
659 | ||
1da177e4 LT |
660 | /* if the vnode ID has changed, then the dirent points to a |
661 | * different file */ | |
08e0e7c8 | 662 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
663 | _debug("%pd: dirent changed [%u != %u]", |
664 | dentry, fid.vnode, | |
08e0e7c8 | 665 | vnode->fid.vnode); |
1da177e4 LT |
666 | goto not_found; |
667 | } | |
668 | ||
669 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
670 | * been deleted and replaced, and the original vnode ID has |
671 | * been reused */ | |
08e0e7c8 | 672 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
673 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
674 | dentry, fid.unique, | |
7a224228 | 675 | vnode->fid.unique, |
c435ee34 DH |
676 | vnode->vfs_inode.i_generation); |
677 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 678 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 679 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 680 | goto not_found; |
1da177e4 | 681 | } |
260a9803 | 682 | goto out_valid; |
08e0e7c8 | 683 | |
260a9803 DH |
684 | case -ENOENT: |
685 | /* the filename is unknown */ | |
a455589f | 686 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 687 | if (d_really_is_positive(dentry)) |
260a9803 DH |
688 | goto not_found; |
689 | goto out_valid; | |
1da177e4 | 690 | |
260a9803 | 691 | default: |
a455589f AV |
692 | _debug("failed to iterate dir %pd: %d", |
693 | parent, ret); | |
c435ee34 | 694 | goto out_bad_parent; |
08e0e7c8 DH |
695 | } |
696 | ||
ec26815a | 697 | out_valid: |
260a9803 | 698 | dentry->d_fsdata = dir_version; |
1da177e4 | 699 | dput(parent); |
00d3b7a4 | 700 | key_put(key); |
1da177e4 LT |
701 | _leave(" = 1 [valid]"); |
702 | return 1; | |
703 | ||
704 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 705 | not_found: |
1da177e4 LT |
706 | spin_lock(&dentry->d_lock); |
707 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
708 | spin_unlock(&dentry->d_lock); | |
709 | ||
c435ee34 | 710 | out_bad_parent: |
a455589f | 711 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 712 | dput(parent); |
c435ee34 | 713 | out_bad: |
00d3b7a4 | 714 | key_put(key); |
1da177e4 LT |
715 | |
716 | _leave(" = 0 [bad]"); | |
717 | return 0; | |
ec26815a | 718 | } |
1da177e4 | 719 | |
1da177e4 LT |
720 | /* |
721 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
722 | * sleep) | |
723 | * - called from dput() when d_count is going to 0. | |
724 | * - return 1 to request dentry be unhashed, 0 otherwise | |
725 | */ | |
fe15ce44 | 726 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 727 | { |
a455589f | 728 | _enter("%pd", dentry); |
1da177e4 LT |
729 | |
730 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
731 | goto zap; | |
732 | ||
2b0143b5 DH |
733 | if (d_really_is_positive(dentry) && |
734 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
735 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 736 | goto zap; |
1da177e4 LT |
737 | |
738 | _leave(" = 0 [keep]"); | |
739 | return 0; | |
740 | ||
ec26815a | 741 | zap: |
1da177e4 LT |
742 | _leave(" = 1 [zap]"); |
743 | return 1; | |
ec26815a | 744 | } |
260a9803 DH |
745 | |
746 | /* | |
747 | * handle dentry release | |
748 | */ | |
749 | static void afs_d_release(struct dentry *dentry) | |
750 | { | |
a455589f | 751 | _enter("%pd", dentry); |
260a9803 DH |
752 | } |
753 | ||
d2ddc776 DH |
754 | /* |
755 | * Create a new inode for create/mkdir/symlink | |
756 | */ | |
757 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
758 | struct dentry *new_dentry, | |
759 | struct afs_fid *newfid, | |
760 | struct afs_file_status *newstatus, | |
761 | struct afs_callback *newcb) | |
762 | { | |
763 | struct inode *inode; | |
764 | ||
765 | if (fc->ac.error < 0) | |
766 | return; | |
767 | ||
bc1527dc DH |
768 | d_drop(new_dentry); |
769 | ||
d2ddc776 DH |
770 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
771 | newfid, newstatus, newcb, fc->cbi); | |
772 | if (IS_ERR(inode)) { | |
773 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
774 | * the new directory on the server. | |
775 | */ | |
776 | fc->ac.error = PTR_ERR(inode); | |
777 | return; | |
778 | } | |
779 | ||
bc1527dc | 780 | d_add(new_dentry, inode); |
d2ddc776 DH |
781 | } |
782 | ||
260a9803 DH |
783 | /* |
784 | * create a directory on an AFS filesystem | |
785 | */ | |
18bb1db3 | 786 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 787 | { |
d2ddc776 DH |
788 | struct afs_file_status newstatus; |
789 | struct afs_fs_cursor fc; | |
790 | struct afs_callback newcb; | |
791 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
792 | struct afs_fid newfid; | |
260a9803 DH |
793 | struct key *key; |
794 | int ret; | |
795 | ||
d2ddc776 | 796 | mode |= S_IFDIR; |
260a9803 | 797 | |
a455589f AV |
798 | _enter("{%x:%u},{%pd},%ho", |
799 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 800 | |
260a9803 DH |
801 | key = afs_request_key(dvnode->volume->cell); |
802 | if (IS_ERR(key)) { | |
803 | ret = PTR_ERR(key); | |
804 | goto error; | |
805 | } | |
806 | ||
d2ddc776 DH |
807 | ret = -ERESTARTSYS; |
808 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
809 | while (afs_select_fileserver(&fc)) { | |
810 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
811 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
812 | &newfid, &newstatus, &newcb); | |
813 | } | |
260a9803 | 814 | |
d2ddc776 DH |
815 | afs_check_for_remote_deletion(&fc, fc.vnode); |
816 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
817 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
818 | ret = afs_end_vnode_operation(&fc); | |
819 | if (ret < 0) | |
820 | goto error_key; | |
4433b691 DH |
821 | } else { |
822 | goto error_key; | |
260a9803 DH |
823 | } |
824 | ||
260a9803 DH |
825 | key_put(key); |
826 | _leave(" = 0"); | |
827 | return 0; | |
828 | ||
d2ddc776 | 829 | error_key: |
260a9803 DH |
830 | key_put(key); |
831 | error: | |
832 | d_drop(dentry); | |
833 | _leave(" = %d", ret); | |
834 | return ret; | |
835 | } | |
836 | ||
d2ddc776 DH |
837 | /* |
838 | * Remove a subdir from a directory. | |
839 | */ | |
840 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
841 | { | |
842 | if (d_really_is_positive(dentry)) { | |
843 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
844 | ||
845 | clear_nlink(&vnode->vfs_inode); | |
846 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
847 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
848 | } | |
849 | } | |
850 | ||
260a9803 DH |
851 | /* |
852 | * remove a directory from an AFS filesystem | |
853 | */ | |
854 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
855 | { | |
d2ddc776 DH |
856 | struct afs_fs_cursor fc; |
857 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 DH |
858 | struct key *key; |
859 | int ret; | |
860 | ||
a455589f AV |
861 | _enter("{%x:%u},{%pd}", |
862 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 863 | |
260a9803 DH |
864 | key = afs_request_key(dvnode->volume->cell); |
865 | if (IS_ERR(key)) { | |
866 | ret = PTR_ERR(key); | |
867 | goto error; | |
868 | } | |
869 | ||
d2ddc776 DH |
870 | ret = -ERESTARTSYS; |
871 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
872 | while (afs_select_fileserver(&fc)) { | |
873 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
874 | afs_fs_remove(&fc, dentry->d_name.name, true); | |
875 | } | |
260a9803 | 876 | |
d2ddc776 DH |
877 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
878 | ret = afs_end_vnode_operation(&fc); | |
879 | if (ret == 0) | |
880 | afs_dir_remove_subdir(dentry); | |
260a9803 DH |
881 | } |
882 | ||
883 | key_put(key); | |
260a9803 | 884 | error: |
260a9803 DH |
885 | return ret; |
886 | } | |
887 | ||
888 | /* | |
d2ddc776 DH |
889 | * Remove a link to a file or symlink from a directory. |
890 | * | |
891 | * If the file was not deleted due to excess hard links, the fileserver will | |
892 | * break the callback promise on the file - if it had one - before it returns | |
893 | * to us, and if it was deleted, it won't | |
894 | * | |
895 | * However, if we didn't have a callback promise outstanding, or it was | |
896 | * outstanding on a different server, then it won't break it either... | |
897 | */ | |
898 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key) | |
899 | { | |
900 | int ret = 0; | |
901 | ||
902 | if (d_really_is_positive(dentry)) { | |
903 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
904 | ||
905 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
906 | kdebug("AFS_VNODE_DELETED"); | |
907 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
908 | ||
909 | ret = afs_validate(vnode, key); | |
910 | if (ret == -ESTALE) | |
911 | ret = 0; | |
912 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); | |
913 | } | |
914 | ||
915 | return ret; | |
916 | } | |
917 | ||
918 | /* | |
919 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
920 | */ |
921 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
922 | { | |
d2ddc776 DH |
923 | struct afs_fs_cursor fc; |
924 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 DH |
925 | struct key *key; |
926 | int ret; | |
927 | ||
a455589f AV |
928 | _enter("{%x:%u},{%pd}", |
929 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 930 | |
45222b9e | 931 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 932 | return -ENAMETOOLONG; |
260a9803 DH |
933 | |
934 | key = afs_request_key(dvnode->volume->cell); | |
935 | if (IS_ERR(key)) { | |
936 | ret = PTR_ERR(key); | |
937 | goto error; | |
938 | } | |
939 | ||
d2ddc776 | 940 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
941 | if (d_really_is_positive(dentry)) { |
942 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
943 | ret = afs_validate(vnode, key); |
944 | if (ret < 0) | |
d2ddc776 | 945 | goto error_key; |
260a9803 DH |
946 | } |
947 | ||
d2ddc776 DH |
948 | ret = -ERESTARTSYS; |
949 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
950 | while (afs_select_fileserver(&fc)) { | |
951 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
952 | afs_fs_remove(&fc, dentry->d_name.name, false); | |
953 | } | |
260a9803 | 954 | |
d2ddc776 DH |
955 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
956 | ret = afs_end_vnode_operation(&fc); | |
957 | if (ret == 0) | |
958 | ret = afs_dir_remove_link(dentry, key); | |
260a9803 DH |
959 | } |
960 | ||
d2ddc776 | 961 | error_key: |
260a9803 DH |
962 | key_put(key); |
963 | error: | |
964 | _leave(" = %d", ret); | |
965 | return ret; | |
966 | } | |
967 | ||
968 | /* | |
969 | * create a regular file on an AFS filesystem | |
970 | */ | |
4acdaf27 | 971 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 972 | bool excl) |
260a9803 | 973 | { |
d2ddc776 DH |
974 | struct afs_fs_cursor fc; |
975 | struct afs_file_status newstatus; | |
976 | struct afs_callback newcb; | |
977 | struct afs_vnode *dvnode = dvnode = AFS_FS_I(dir); | |
978 | struct afs_fid newfid; | |
260a9803 DH |
979 | struct key *key; |
980 | int ret; | |
981 | ||
d2ddc776 | 982 | mode |= S_IFREG; |
260a9803 | 983 | |
a455589f AV |
984 | _enter("{%x:%u},{%pd},%ho,", |
985 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 986 | |
d2ddc776 DH |
987 | ret = -ENAMETOOLONG; |
988 | if (dentry->d_name.len >= AFSNAMEMAX) | |
989 | goto error; | |
990 | ||
260a9803 DH |
991 | key = afs_request_key(dvnode->volume->cell); |
992 | if (IS_ERR(key)) { | |
993 | ret = PTR_ERR(key); | |
994 | goto error; | |
995 | } | |
996 | ||
d2ddc776 DH |
997 | ret = -ERESTARTSYS; |
998 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
999 | while (afs_select_fileserver(&fc)) { | |
1000 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1001 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1002 | &newfid, &newstatus, &newcb); | |
1003 | } | |
260a9803 | 1004 | |
d2ddc776 DH |
1005 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1006 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1007 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1008 | ret = afs_end_vnode_operation(&fc); | |
1009 | if (ret < 0) | |
1010 | goto error_key; | |
4433b691 DH |
1011 | } else { |
1012 | goto error_key; | |
260a9803 DH |
1013 | } |
1014 | ||
260a9803 DH |
1015 | key_put(key); |
1016 | _leave(" = 0"); | |
1017 | return 0; | |
1018 | ||
d2ddc776 | 1019 | error_key: |
260a9803 DH |
1020 | key_put(key); |
1021 | error: | |
1022 | d_drop(dentry); | |
1023 | _leave(" = %d", ret); | |
1024 | return ret; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * create a hard link between files in an AFS filesystem | |
1029 | */ | |
1030 | static int afs_link(struct dentry *from, struct inode *dir, | |
1031 | struct dentry *dentry) | |
1032 | { | |
d2ddc776 | 1033 | struct afs_fs_cursor fc; |
260a9803 DH |
1034 | struct afs_vnode *dvnode, *vnode; |
1035 | struct key *key; | |
1036 | int ret; | |
1037 | ||
2b0143b5 | 1038 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 DH |
1039 | dvnode = AFS_FS_I(dir); |
1040 | ||
a455589f | 1041 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1042 | vnode->fid.vid, vnode->fid.vnode, |
1043 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1044 | dentry); |
260a9803 | 1045 | |
d2ddc776 DH |
1046 | ret = -ENAMETOOLONG; |
1047 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1048 | goto error; | |
1049 | ||
260a9803 DH |
1050 | key = afs_request_key(dvnode->volume->cell); |
1051 | if (IS_ERR(key)) { | |
1052 | ret = PTR_ERR(key); | |
1053 | goto error; | |
1054 | } | |
1055 | ||
d2ddc776 DH |
1056 | ret = -ERESTARTSYS; |
1057 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1058 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1059 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1060 | goto error_key; |
d2ddc776 DH |
1061 | } |
1062 | ||
1063 | while (afs_select_fileserver(&fc)) { | |
1064 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1065 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
1066 | afs_fs_link(&fc, vnode, dentry->d_name.name); | |
1067 | } | |
1068 | ||
1069 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1070 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1071 | ihold(&vnode->vfs_inode); | |
1072 | d_instantiate(dentry, &vnode->vfs_inode); | |
1073 | ||
1074 | mutex_unlock(&vnode->io_lock); | |
1075 | ret = afs_end_vnode_operation(&fc); | |
1076 | if (ret < 0) | |
1077 | goto error_key; | |
4433b691 DH |
1078 | } else { |
1079 | goto error_key; | |
d2ddc776 | 1080 | } |
260a9803 | 1081 | |
260a9803 DH |
1082 | key_put(key); |
1083 | _leave(" = 0"); | |
1084 | return 0; | |
1085 | ||
d2ddc776 | 1086 | error_key: |
260a9803 DH |
1087 | key_put(key); |
1088 | error: | |
1089 | d_drop(dentry); | |
1090 | _leave(" = %d", ret); | |
1091 | return ret; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * create a symlink in an AFS filesystem | |
1096 | */ | |
1097 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1098 | const char *content) | |
1099 | { | |
d2ddc776 DH |
1100 | struct afs_fs_cursor fc; |
1101 | struct afs_file_status newstatus; | |
1102 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1103 | struct afs_fid newfid; | |
260a9803 DH |
1104 | struct key *key; |
1105 | int ret; | |
1106 | ||
a455589f AV |
1107 | _enter("{%x:%u},{%pd},%s", |
1108 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1109 | content); |
1110 | ||
d2ddc776 DH |
1111 | ret = -ENAMETOOLONG; |
1112 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1113 | goto error; | |
1114 | ||
260a9803 | 1115 | ret = -EINVAL; |
45222b9e | 1116 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1117 | goto error; |
1118 | ||
1119 | key = afs_request_key(dvnode->volume->cell); | |
1120 | if (IS_ERR(key)) { | |
1121 | ret = PTR_ERR(key); | |
1122 | goto error; | |
1123 | } | |
1124 | ||
d2ddc776 DH |
1125 | ret = -ERESTARTSYS; |
1126 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1127 | while (afs_select_fileserver(&fc)) { | |
1128 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1129 | afs_fs_symlink(&fc, dentry->d_name.name, content, | |
1130 | &newfid, &newstatus); | |
1131 | } | |
260a9803 | 1132 | |
d2ddc776 DH |
1133 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1134 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1135 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1136 | ret = afs_end_vnode_operation(&fc); | |
1137 | if (ret < 0) | |
1138 | goto error_key; | |
4433b691 DH |
1139 | } else { |
1140 | goto error_key; | |
260a9803 DH |
1141 | } |
1142 | ||
260a9803 DH |
1143 | key_put(key); |
1144 | _leave(" = 0"); | |
1145 | return 0; | |
1146 | ||
d2ddc776 | 1147 | error_key: |
260a9803 DH |
1148 | key_put(key); |
1149 | error: | |
1150 | d_drop(dentry); | |
1151 | _leave(" = %d", ret); | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * rename a file in an AFS filesystem and/or move it between directories | |
1157 | */ | |
1158 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1159 | struct inode *new_dir, struct dentry *new_dentry, |
1160 | unsigned int flags) | |
260a9803 | 1161 | { |
d2ddc776 | 1162 | struct afs_fs_cursor fc; |
260a9803 DH |
1163 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1164 | struct key *key; | |
1165 | int ret; | |
1166 | ||
1cd66c93 MS |
1167 | if (flags) |
1168 | return -EINVAL; | |
1169 | ||
2b0143b5 | 1170 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1171 | orig_dvnode = AFS_FS_I(old_dir); |
1172 | new_dvnode = AFS_FS_I(new_dir); | |
1173 | ||
a455589f | 1174 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1175 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1176 | vnode->fid.vid, vnode->fid.vnode, | |
1177 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1178 | new_dentry); |
260a9803 | 1179 | |
260a9803 DH |
1180 | key = afs_request_key(orig_dvnode->volume->cell); |
1181 | if (IS_ERR(key)) { | |
1182 | ret = PTR_ERR(key); | |
1183 | goto error; | |
1184 | } | |
1185 | ||
d2ddc776 DH |
1186 | ret = -ERESTARTSYS; |
1187 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1188 | if (orig_dvnode != new_dvnode) { | |
1189 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1190 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1191 | goto error_key; |
d2ddc776 DH |
1192 | } |
1193 | } | |
1194 | while (afs_select_fileserver(&fc)) { | |
1195 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1196 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1197 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
1198 | new_dvnode, new_dentry->d_name.name); | |
1199 | } | |
1200 | ||
1201 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1202 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1203 | if (orig_dvnode != new_dvnode) | |
1204 | mutex_unlock(&new_dvnode->io_lock); | |
1205 | ret = afs_end_vnode_operation(&fc); | |
1206 | if (ret < 0) | |
1207 | goto error_key; | |
1208 | } | |
1209 | ||
d2ddc776 | 1210 | error_key: |
260a9803 DH |
1211 | key_put(key); |
1212 | error: | |
260a9803 DH |
1213 | _leave(" = %d", ret); |
1214 | return ret; | |
1215 | } |