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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> |
4d673da1 | 20 | #include <linux/dns_resolver.h> |
1da177e4 LT |
21 | #include "internal.h" |
22 | ||
260a9803 | 23 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 24 | unsigned int flags); |
4d673da1 DH |
25 | static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry, |
26 | unsigned int flags); | |
1da177e4 | 27 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 28 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 29 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 30 | static int afs_d_delete(const struct dentry *dentry); |
260a9803 | 31 | static void afs_d_release(struct dentry *dentry); |
ac7576f4 | 32 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 33 | loff_t fpos, u64 ino, unsigned dtype); |
4acdaf27 | 34 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 35 | bool excl); |
18bb1db3 | 36 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
37 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
38 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
39 | static int afs_link(struct dentry *from, struct inode *dir, | |
40 | struct dentry *dentry); | |
41 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
42 | const char *content); | |
43 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
44 | struct inode *new_dir, struct dentry *new_dentry, |
45 | unsigned int flags); | |
1da177e4 | 46 | |
4b6f5d20 | 47 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 48 | .open = afs_dir_open, |
00d3b7a4 | 49 | .release = afs_release, |
29884eff | 50 | .iterate_shared = afs_readdir, |
e8d6c554 | 51 | .lock = afs_lock, |
3222a3e5 | 52 | .llseek = generic_file_llseek, |
1da177e4 LT |
53 | }; |
54 | ||
754661f1 | 55 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
56 | .create = afs_create, |
57 | .lookup = afs_lookup, | |
58 | .link = afs_link, | |
59 | .unlink = afs_unlink, | |
60 | .symlink = afs_symlink, | |
61 | .mkdir = afs_mkdir, | |
62 | .rmdir = afs_rmdir, | |
2773bf00 | 63 | .rename = afs_rename, |
00d3b7a4 | 64 | .permission = afs_permission, |
416351f2 | 65 | .getattr = afs_getattr, |
31143d5d | 66 | .setattr = afs_setattr, |
d3e3b7ea | 67 | .listxattr = afs_listxattr, |
1da177e4 LT |
68 | }; |
69 | ||
4d673da1 DH |
70 | const struct file_operations afs_dynroot_file_operations = { |
71 | .open = dcache_dir_open, | |
72 | .release = dcache_dir_close, | |
73 | .iterate_shared = dcache_readdir, | |
74 | .llseek = dcache_dir_lseek, | |
75 | }; | |
76 | ||
77 | const struct inode_operations afs_dynroot_inode_operations = { | |
78 | .lookup = afs_dynroot_lookup, | |
79 | }; | |
80 | ||
d61dcce2 | 81 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
82 | .d_revalidate = afs_d_revalidate, |
83 | .d_delete = afs_d_delete, | |
260a9803 | 84 | .d_release = afs_d_release, |
d18610b0 | 85 | .d_automount = afs_d_automount, |
1da177e4 LT |
86 | }; |
87 | ||
88 | #define AFS_DIR_HASHTBL_SIZE 128 | |
89 | #define AFS_DIR_DIRENT_SIZE 32 | |
90 | #define AFS_DIRENT_PER_BLOCK 64 | |
91 | ||
92 | union afs_dirent { | |
93 | struct { | |
94 | uint8_t valid; | |
95 | uint8_t unused[1]; | |
96 | __be16 hash_next; | |
97 | __be32 vnode; | |
98 | __be32 unique; | |
99 | uint8_t name[16]; | |
100 | uint8_t overflow[4]; /* if any char of the name (inc | |
101 | * NUL) reaches here, consume | |
102 | * the next dirent too */ | |
103 | } u; | |
104 | uint8_t extended_name[32]; | |
105 | }; | |
106 | ||
107 | /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ | |
108 | struct afs_dir_pagehdr { | |
109 | __be16 npages; | |
110 | __be16 magic; | |
111 | #define AFS_DIR_MAGIC htons(1234) | |
112 | uint8_t nentries; | |
113 | uint8_t bitmap[8]; | |
114 | uint8_t pad[19]; | |
115 | }; | |
116 | ||
117 | /* directory block layout */ | |
118 | union afs_dir_block { | |
119 | ||
120 | struct afs_dir_pagehdr pagehdr; | |
121 | ||
122 | struct { | |
123 | struct afs_dir_pagehdr pagehdr; | |
124 | uint8_t alloc_ctrs[128]; | |
125 | /* dir hash table */ | |
126 | uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; | |
127 | } hdr; | |
128 | ||
129 | union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; | |
130 | }; | |
131 | ||
132 | /* layout on a linux VM page */ | |
133 | struct afs_dir_page { | |
134 | union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; | |
135 | }; | |
136 | ||
260a9803 | 137 | struct afs_lookup_cookie { |
1bbae9f8 | 138 | struct dir_context ctx; |
1da177e4 | 139 | struct afs_fid fid; |
1bbae9f8 | 140 | struct qstr name; |
1da177e4 LT |
141 | int found; |
142 | }; | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * check that a directory page is valid | |
146 | */ | |
dab17c1a | 147 | bool afs_dir_check_page(struct inode *dir, struct page *page) |
1da177e4 LT |
148 | { |
149 | struct afs_dir_page *dbuf; | |
dab17c1a DH |
150 | struct afs_vnode *vnode = AFS_FS_I(dir); |
151 | loff_t latter, i_size, off; | |
1da177e4 LT |
152 | int tmp, qty; |
153 | ||
154 | #if 0 | |
155 | /* check the page count */ | |
156 | qty = desc.size / sizeof(dbuf->blocks[0]); | |
157 | if (qty == 0) | |
158 | goto error; | |
159 | ||
08e0e7c8 | 160 | if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
1da177e4 | 161 | printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
530b6412 | 162 | __func__, dir->i_ino, qty, |
08e0e7c8 | 163 | ntohs(dbuf->blocks[0].pagehdr.npages)); |
1da177e4 LT |
164 | goto error; |
165 | } | |
166 | #endif | |
167 | ||
dab17c1a DH |
168 | /* Determine how many magic numbers there should be in this page, but |
169 | * we must take care because the directory may change size under us. | |
170 | */ | |
171 | off = page_offset(page); | |
172 | i_size = i_size_read(dir); | |
173 | if (i_size <= off) | |
174 | goto checked; | |
175 | ||
176 | latter = i_size - off; | |
1da177e4 LT |
177 | if (latter >= PAGE_SIZE) |
178 | qty = PAGE_SIZE; | |
179 | else | |
180 | qty = latter; | |
181 | qty /= sizeof(union afs_dir_block); | |
182 | ||
183 | /* check them */ | |
184 | dbuf = page_address(page); | |
185 | for (tmp = 0; tmp < qty; tmp++) { | |
186 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
dab17c1a | 187 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
530b6412 | 188 | __func__, dir->i_ino, tmp, qty, |
1da177e4 | 189 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
dab17c1a | 190 | trace_afs_dir_check_failed(vnode, off, i_size); |
1da177e4 LT |
191 | goto error; |
192 | } | |
193 | } | |
194 | ||
dab17c1a | 195 | checked: |
1da177e4 | 196 | SetPageChecked(page); |
be5b82db | 197 | return true; |
1da177e4 | 198 | |
ec26815a | 199 | error: |
1da177e4 | 200 | SetPageError(page); |
be5b82db | 201 | return false; |
ec26815a | 202 | } |
1da177e4 | 203 | |
1da177e4 LT |
204 | /* |
205 | * discard a page cached in the pagecache | |
206 | */ | |
207 | static inline void afs_dir_put_page(struct page *page) | |
208 | { | |
209 | kunmap(page); | |
dab17c1a | 210 | unlock_page(page); |
09cbfeaf | 211 | put_page(page); |
ec26815a | 212 | } |
1da177e4 | 213 | |
1da177e4 LT |
214 | /* |
215 | * get a page into the pagecache | |
216 | */ | |
00d3b7a4 DH |
217 | static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
218 | struct key *key) | |
1da177e4 LT |
219 | { |
220 | struct page *page; | |
1da177e4 LT |
221 | _enter("{%lu},%lu", dir->i_ino, index); |
222 | ||
f6d335c0 | 223 | page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
1da177e4 | 224 | if (!IS_ERR(page)) { |
dab17c1a | 225 | lock_page(page); |
1da177e4 | 226 | kmap(page); |
be5b82db | 227 | if (unlikely(!PageChecked(page))) { |
dab17c1a | 228 | if (PageError(page)) |
be5b82db AV |
229 | goto fail; |
230 | } | |
1da177e4 LT |
231 | } |
232 | return page; | |
233 | ||
ec26815a | 234 | fail: |
1da177e4 | 235 | afs_dir_put_page(page); |
08e0e7c8 | 236 | _leave(" = -EIO"); |
1da177e4 | 237 | return ERR_PTR(-EIO); |
ec26815a | 238 | } |
1da177e4 | 239 | |
1da177e4 LT |
240 | /* |
241 | * open an AFS directory file | |
242 | */ | |
243 | static int afs_dir_open(struct inode *inode, struct file *file) | |
244 | { | |
245 | _enter("{%lu}", inode->i_ino); | |
246 | ||
2ecd05ae AD |
247 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
248 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 249 | |
08e0e7c8 | 250 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
251 | return -ENOENT; |
252 | ||
00d3b7a4 | 253 | return afs_open(inode, file); |
ec26815a | 254 | } |
1da177e4 | 255 | |
1da177e4 LT |
256 | /* |
257 | * deal with one block in an AFS directory | |
258 | */ | |
1bbae9f8 | 259 | static int afs_dir_iterate_block(struct dir_context *ctx, |
1da177e4 | 260 | union afs_dir_block *block, |
1bbae9f8 | 261 | unsigned blkoff) |
1da177e4 LT |
262 | { |
263 | union afs_dirent *dire; | |
264 | unsigned offset, next, curr; | |
265 | size_t nlen; | |
1bbae9f8 | 266 | int tmp; |
1da177e4 | 267 | |
1bbae9f8 | 268 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 269 | |
1bbae9f8 | 270 | curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); |
1da177e4 LT |
271 | |
272 | /* walk through the block, an entry at a time */ | |
273 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
274 | offset < AFS_DIRENT_PER_BLOCK; | |
275 | offset = next | |
276 | ) { | |
277 | next = offset + 1; | |
278 | ||
279 | /* skip entries marked unused in the bitmap */ | |
280 | if (!(block->pagehdr.bitmap[offset / 8] & | |
281 | (1 << (offset % 8)))) { | |
5b5e0928 | 282 | _debug("ENT[%zu.%u]: unused", |
1da177e4 LT |
283 | blkoff / sizeof(union afs_dir_block), offset); |
284 | if (offset >= curr) | |
1bbae9f8 | 285 | ctx->pos = blkoff + |
1da177e4 LT |
286 | next * sizeof(union afs_dirent); |
287 | continue; | |
288 | } | |
289 | ||
290 | /* got a valid entry */ | |
291 | dire = &block->dirents[offset]; | |
292 | nlen = strnlen(dire->u.name, | |
293 | sizeof(*block) - | |
294 | offset * sizeof(union afs_dirent)); | |
295 | ||
5b5e0928 | 296 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
1da177e4 LT |
297 | blkoff / sizeof(union afs_dir_block), offset, |
298 | (offset < curr ? "skip" : "fill"), | |
299 | nlen, dire->u.name); | |
300 | ||
301 | /* work out where the next possible entry is */ | |
302 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
303 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
5b5e0928 | 304 | _debug("ENT[%zu.%u]:" |
1da177e4 | 305 | " %u travelled beyond end dir block" |
5b5e0928 | 306 | " (len %u/%zu)", |
1da177e4 LT |
307 | blkoff / sizeof(union afs_dir_block), |
308 | offset, next, tmp, nlen); | |
309 | return -EIO; | |
310 | } | |
311 | if (!(block->pagehdr.bitmap[next / 8] & | |
312 | (1 << (next % 8)))) { | |
5b5e0928 AD |
313 | _debug("ENT[%zu.%u]:" |
314 | " %u unmarked extension (len %u/%zu)", | |
1da177e4 LT |
315 | blkoff / sizeof(union afs_dir_block), |
316 | offset, next, tmp, nlen); | |
317 | return -EIO; | |
318 | } | |
319 | ||
5b5e0928 | 320 | _debug("ENT[%zu.%u]: ext %u/%zu", |
1da177e4 LT |
321 | blkoff / sizeof(union afs_dir_block), |
322 | next, tmp, nlen); | |
323 | next++; | |
324 | } | |
325 | ||
326 | /* skip if starts before the current position */ | |
327 | if (offset < curr) | |
328 | continue; | |
329 | ||
330 | /* found the next entry */ | |
1bbae9f8 | 331 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 332 | ntohl(dire->u.vnode), |
1bbae9f8 AV |
333 | ctx->actor == afs_lookup_filldir ? |
334 | ntohl(dire->u.unique) : DT_UNKNOWN)) { | |
1da177e4 LT |
335 | _leave(" = 0 [full]"); |
336 | return 0; | |
337 | } | |
338 | ||
1bbae9f8 | 339 | ctx->pos = blkoff + next * sizeof(union afs_dirent); |
1da177e4 LT |
340 | } |
341 | ||
342 | _leave(" = 1 [more]"); | |
343 | return 1; | |
ec26815a | 344 | } |
1da177e4 | 345 | |
1da177e4 | 346 | /* |
08e0e7c8 | 347 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 348 | */ |
1bbae9f8 AV |
349 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
350 | struct key *key) | |
1da177e4 | 351 | { |
08e0e7c8 | 352 | union afs_dir_block *dblock; |
1da177e4 LT |
353 | struct afs_dir_page *dbuf; |
354 | struct page *page; | |
355 | unsigned blkoff, limit; | |
356 | int ret; | |
357 | ||
1bbae9f8 | 358 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 359 | |
08e0e7c8 | 360 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
361 | _leave(" = -ESTALE"); |
362 | return -ESTALE; | |
363 | } | |
364 | ||
365 | /* round the file position up to the next entry boundary */ | |
1bbae9f8 AV |
366 | ctx->pos += sizeof(union afs_dirent) - 1; |
367 | ctx->pos &= ~(sizeof(union afs_dirent) - 1); | |
1da177e4 LT |
368 | |
369 | /* walk through the blocks in sequence */ | |
370 | ret = 0; | |
1bbae9f8 AV |
371 | while (ctx->pos < dir->i_size) { |
372 | blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); | |
1da177e4 LT |
373 | |
374 | /* fetch the appropriate page from the directory */ | |
00d3b7a4 | 375 | page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
1da177e4 LT |
376 | if (IS_ERR(page)) { |
377 | ret = PTR_ERR(page); | |
378 | break; | |
379 | } | |
380 | ||
381 | limit = blkoff & ~(PAGE_SIZE - 1); | |
382 | ||
383 | dbuf = page_address(page); | |
384 | ||
385 | /* deal with the individual blocks stashed on this page */ | |
386 | do { | |
387 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
388 | sizeof(union afs_dir_block)]; | |
1bbae9f8 | 389 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 LT |
390 | if (ret != 1) { |
391 | afs_dir_put_page(page); | |
392 | goto out; | |
393 | } | |
394 | ||
395 | blkoff += sizeof(union afs_dir_block); | |
396 | ||
1bbae9f8 | 397 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 LT |
398 | |
399 | afs_dir_put_page(page); | |
400 | ret = 0; | |
401 | } | |
402 | ||
ec26815a | 403 | out: |
1da177e4 LT |
404 | _leave(" = %d", ret); |
405 | return ret; | |
ec26815a | 406 | } |
1da177e4 | 407 | |
1da177e4 LT |
408 | /* |
409 | * read an AFS directory | |
410 | */ | |
1bbae9f8 | 411 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 412 | { |
215804a9 | 413 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 414 | } |
1da177e4 | 415 | |
1da177e4 LT |
416 | /* |
417 | * search the directory for a name | |
418 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
419 | * uniquifier through dtype | |
420 | */ | |
ac7576f4 MS |
421 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, |
422 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 423 | { |
ac7576f4 MS |
424 | struct afs_lookup_cookie *cookie = |
425 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
1da177e4 | 426 | |
1bbae9f8 AV |
427 | _enter("{%s,%u},%s,%u,,%llu,%u", |
428 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 429 | (unsigned long long) ino, dtype); |
1da177e4 | 430 | |
08e0e7c8 DH |
431 | /* insanity checks first */ |
432 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
433 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
434 | ||
1bbae9f8 AV |
435 | if (cookie->name.len != nlen || |
436 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
437 | _leave(" = 0 [no]"); |
438 | return 0; | |
439 | } | |
440 | ||
441 | cookie->fid.vnode = ino; | |
442 | cookie->fid.unique = dtype; | |
443 | cookie->found = 1; | |
444 | ||
445 | _leave(" = -1 [found]"); | |
446 | return -1; | |
ec26815a | 447 | } |
1da177e4 | 448 | |
1da177e4 | 449 | /* |
08e0e7c8 | 450 | * do a lookup in a directory |
260a9803 | 451 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 452 | */ |
08e0e7c8 | 453 | static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
00d3b7a4 | 454 | struct afs_fid *fid, struct key *key) |
1da177e4 | 455 | { |
1bbae9f8 AV |
456 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
457 | struct afs_lookup_cookie cookie = { | |
458 | .ctx.actor = afs_lookup_filldir, | |
459 | .name = dentry->d_name, | |
460 | .fid.vid = as->volume->vid | |
461 | }; | |
1da177e4 LT |
462 | int ret; |
463 | ||
a455589f | 464 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 465 | |
1da177e4 | 466 | /* search the directory */ |
1bbae9f8 | 467 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 468 | if (ret < 0) { |
08e0e7c8 DH |
469 | _leave(" = %d [iter]", ret); |
470 | return ret; | |
1da177e4 LT |
471 | } |
472 | ||
473 | ret = -ENOENT; | |
474 | if (!cookie.found) { | |
08e0e7c8 DH |
475 | _leave(" = -ENOENT [not found]"); |
476 | return -ENOENT; | |
1da177e4 LT |
477 | } |
478 | ||
08e0e7c8 DH |
479 | *fid = cookie.fid; |
480 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
481 | return 0; | |
482 | } | |
483 | ||
4d673da1 DH |
484 | /* |
485 | * Probe to see if a cell may exist. This prevents positive dentries from | |
486 | * being created unnecessarily. | |
487 | */ | |
488 | static int afs_probe_cell_name(struct dentry *dentry) | |
489 | { | |
490 | struct afs_cell *cell; | |
491 | const char *name = dentry->d_name.name; | |
492 | size_t len = dentry->d_name.len; | |
493 | int ret; | |
494 | ||
495 | /* Names prefixed with a dot are R/W mounts. */ | |
496 | if (name[0] == '.') { | |
497 | if (len == 1) | |
498 | return -EINVAL; | |
499 | name++; | |
500 | len--; | |
501 | } | |
502 | ||
503 | cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len); | |
504 | if (!IS_ERR(cell)) { | |
505 | afs_put_cell(afs_d2net(dentry), cell); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL); | |
510 | if (ret == -ENODATA) | |
511 | ret = -EDESTADDRREQ; | |
512 | return ret; | |
513 | } | |
514 | ||
bec5eb61 | 515 | /* |
516 | * Try to auto mount the mountpoint with pseudo directory, if the autocell | |
517 | * operation is setted. | |
518 | */ | |
4d673da1 DH |
519 | static struct inode *afs_try_auto_mntpt(struct dentry *dentry, |
520 | struct inode *dir, struct afs_fid *fid) | |
bec5eb61 | 521 | { |
bec5eb61 | 522 | struct afs_vnode *vnode = AFS_FS_I(dir); |
523 | struct inode *inode; | |
4d673da1 | 524 | int ret = -ENOENT; |
bec5eb61 | 525 | |
4d673da1 DH |
526 | _enter("%p{%pd}, {%x:%u}", |
527 | dentry, dentry, vnode->fid.vid, vnode->fid.vnode); | |
528 | ||
529 | if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) | |
530 | goto out; | |
bec5eb61 | 531 | |
4d673da1 DH |
532 | ret = afs_probe_cell_name(dentry); |
533 | if (ret < 0) | |
bec5eb61 | 534 | goto out; |
535 | ||
4d673da1 | 536 | inode = afs_iget_pseudo_dir(dir->i_sb, false); |
bec5eb61 | 537 | if (IS_ERR(inode)) { |
538 | ret = PTR_ERR(inode); | |
539 | goto out; | |
540 | } | |
541 | ||
542 | *fid = AFS_FS_I(inode)->fid; | |
543 | _leave("= %p", inode); | |
544 | return inode; | |
545 | ||
546 | out: | |
547 | _leave("= %d", ret); | |
548 | return ERR_PTR(ret); | |
549 | } | |
550 | ||
08e0e7c8 DH |
551 | /* |
552 | * look up an entry in a directory | |
553 | */ | |
260a9803 | 554 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 555 | unsigned int flags) |
08e0e7c8 DH |
556 | { |
557 | struct afs_vnode *vnode; | |
558 | struct afs_fid fid; | |
559 | struct inode *inode; | |
00d3b7a4 | 560 | struct key *key; |
08e0e7c8 DH |
561 | int ret; |
562 | ||
260a9803 DH |
563 | vnode = AFS_FS_I(dir); |
564 | ||
a455589f AV |
565 | _enter("{%x:%u},%p{%pd},", |
566 | vnode->fid.vid, vnode->fid.vnode, dentry, dentry); | |
260a9803 | 567 | |
2b0143b5 | 568 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 569 | |
45222b9e | 570 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
571 | _leave(" = -ENAMETOOLONG"); |
572 | return ERR_PTR(-ENAMETOOLONG); | |
573 | } | |
574 | ||
08e0e7c8 DH |
575 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
576 | _leave(" = -ESTALE"); | |
577 | return ERR_PTR(-ESTALE); | |
578 | } | |
579 | ||
00d3b7a4 DH |
580 | key = afs_request_key(vnode->volume->cell); |
581 | if (IS_ERR(key)) { | |
582 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 583 | return ERR_CAST(key); |
00d3b7a4 DH |
584 | } |
585 | ||
260a9803 DH |
586 | ret = afs_validate(vnode, key); |
587 | if (ret < 0) { | |
588 | key_put(key); | |
589 | _leave(" = %d [val]", ret); | |
590 | return ERR_PTR(ret); | |
591 | } | |
592 | ||
00d3b7a4 | 593 | ret = afs_do_lookup(dir, dentry, &fid, key); |
1da177e4 | 594 | if (ret < 0) { |
4d673da1 DH |
595 | if (ret == -ENOENT) { |
596 | inode = afs_try_auto_mntpt(dentry, dir, &fid); | |
597 | if (!IS_ERR(inode)) { | |
598 | key_put(key); | |
599 | goto success; | |
600 | } | |
601 | ||
602 | ret = PTR_ERR(inode); | |
bec5eb61 | 603 | } |
604 | ||
00d3b7a4 | 605 | key_put(key); |
260a9803 DH |
606 | if (ret == -ENOENT) { |
607 | d_add(dentry, NULL); | |
608 | _leave(" = NULL [negative]"); | |
609 | return NULL; | |
610 | } | |
08e0e7c8 | 611 | _leave(" = %d [do]", ret); |
1da177e4 LT |
612 | return ERR_PTR(ret); |
613 | } | |
260a9803 | 614 | dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
1da177e4 | 615 | |
08e0e7c8 | 616 | /* instantiate the dentry */ |
d2ddc776 | 617 | inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL); |
00d3b7a4 | 618 | key_put(key); |
08e0e7c8 DH |
619 | if (IS_ERR(inode)) { |
620 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 621 | return ERR_CAST(inode); |
08e0e7c8 DH |
622 | } |
623 | ||
bec5eb61 | 624 | success: |
1da177e4 | 625 | d_add(dentry, inode); |
d6e43f75 | 626 | _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", |
08e0e7c8 DH |
627 | fid.vnode, |
628 | fid.unique, | |
2b0143b5 DH |
629 | d_inode(dentry)->i_ino, |
630 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
631 | |
632 | return NULL; | |
ec26815a | 633 | } |
1da177e4 | 634 | |
4d673da1 DH |
635 | /* |
636 | * Look up an entry in a dynroot directory. | |
637 | */ | |
638 | static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry, | |
639 | unsigned int flags) | |
640 | { | |
641 | struct afs_vnode *vnode; | |
642 | struct afs_fid fid; | |
643 | struct inode *inode; | |
644 | int ret; | |
645 | ||
646 | vnode = AFS_FS_I(dir); | |
647 | ||
648 | _enter("%pd", dentry); | |
649 | ||
650 | ASSERTCMP(d_inode(dentry), ==, NULL); | |
651 | ||
652 | if (dentry->d_name.len >= AFSNAMEMAX) { | |
653 | _leave(" = -ENAMETOOLONG"); | |
654 | return ERR_PTR(-ENAMETOOLONG); | |
655 | } | |
656 | ||
657 | inode = afs_try_auto_mntpt(dentry, dir, &fid); | |
658 | if (IS_ERR(inode)) { | |
659 | ret = PTR_ERR(inode); | |
660 | if (ret == -ENOENT) { | |
661 | d_add(dentry, NULL); | |
662 | _leave(" = NULL [negative]"); | |
663 | return NULL; | |
664 | } | |
665 | _leave(" = %d [do]", ret); | |
666 | return ERR_PTR(ret); | |
667 | } | |
668 | ||
669 | d_add(dentry, inode); | |
670 | _leave(" = 0 { ino=%lu v=%u }", | |
671 | d_inode(dentry)->i_ino, d_inode(dentry)->i_generation); | |
672 | return NULL; | |
673 | } | |
674 | ||
1da177e4 LT |
675 | /* |
676 | * check that a dentry lookup hit has found a valid entry | |
677 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
678 | * inode | |
1da177e4 | 679 | */ |
0b728e19 | 680 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 681 | { |
4d673da1 | 682 | struct afs_super_info *as = dentry->d_sb->s_fs_info; |
260a9803 | 683 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 684 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 685 | struct dentry *parent; |
c435ee34 | 686 | struct inode *inode; |
00d3b7a4 | 687 | struct key *key; |
260a9803 | 688 | void *dir_version; |
1da177e4 LT |
689 | int ret; |
690 | ||
0b728e19 | 691 | if (flags & LOOKUP_RCU) |
34286d66 NP |
692 | return -ECHILD; |
693 | ||
4d673da1 DH |
694 | if (as->dyn_root) |
695 | return 1; | |
696 | ||
c435ee34 DH |
697 | if (d_really_is_positive(dentry)) { |
698 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
699 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
700 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 701 | vnode->flags); |
c435ee34 | 702 | } else { |
a455589f | 703 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 704 | } |
1da177e4 | 705 | |
260a9803 | 706 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
707 | if (IS_ERR(key)) |
708 | key = NULL; | |
709 | ||
c435ee34 DH |
710 | if (d_really_is_positive(dentry)) { |
711 | inode = d_inode(dentry); | |
712 | if (inode) { | |
713 | vnode = AFS_FS_I(inode); | |
714 | afs_validate(vnode, key); | |
715 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
716 | goto out_bad; | |
717 | } | |
718 | } | |
719 | ||
1da177e4 | 720 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 721 | parent = dget_parent(dentry); |
2b0143b5 | 722 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 723 | |
260a9803 | 724 | /* validate the parent directory */ |
c435ee34 | 725 | afs_validate(dir, key); |
260a9803 DH |
726 | |
727 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 728 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 729 | goto out_bad_parent; |
1da177e4 LT |
730 | } |
731 | ||
260a9803 DH |
732 | dir_version = (void *) (unsigned long) dir->status.data_version; |
733 | if (dentry->d_fsdata == dir_version) | |
734 | goto out_valid; /* the dir contents are unchanged */ | |
1da177e4 | 735 | |
260a9803 DH |
736 | _debug("dir modified"); |
737 | ||
738 | /* search the directory for this vnode */ | |
739 | ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); | |
740 | switch (ret) { | |
741 | case 0: | |
742 | /* the filename maps to something */ | |
2b0143b5 | 743 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
744 | goto out_bad_parent; |
745 | inode = d_inode(dentry); | |
746 | if (is_bad_inode(inode)) { | |
a455589f AV |
747 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
748 | dentry); | |
c435ee34 | 749 | goto out_bad_parent; |
1da177e4 LT |
750 | } |
751 | ||
c435ee34 DH |
752 | vnode = AFS_FS_I(inode); |
753 | ||
1da177e4 LT |
754 | /* if the vnode ID has changed, then the dirent points to a |
755 | * different file */ | |
08e0e7c8 | 756 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
757 | _debug("%pd: dirent changed [%u != %u]", |
758 | dentry, fid.vnode, | |
08e0e7c8 | 759 | vnode->fid.vnode); |
1da177e4 LT |
760 | goto not_found; |
761 | } | |
762 | ||
763 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
764 | * been deleted and replaced, and the original vnode ID has |
765 | * been reused */ | |
08e0e7c8 | 766 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
767 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
768 | dentry, fid.unique, | |
7a224228 | 769 | vnode->fid.unique, |
c435ee34 DH |
770 | vnode->vfs_inode.i_generation); |
771 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 772 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 773 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 774 | goto not_found; |
1da177e4 | 775 | } |
260a9803 | 776 | goto out_valid; |
08e0e7c8 | 777 | |
260a9803 DH |
778 | case -ENOENT: |
779 | /* the filename is unknown */ | |
a455589f | 780 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 781 | if (d_really_is_positive(dentry)) |
260a9803 DH |
782 | goto not_found; |
783 | goto out_valid; | |
1da177e4 | 784 | |
260a9803 | 785 | default: |
a455589f AV |
786 | _debug("failed to iterate dir %pd: %d", |
787 | parent, ret); | |
c435ee34 | 788 | goto out_bad_parent; |
08e0e7c8 DH |
789 | } |
790 | ||
ec26815a | 791 | out_valid: |
260a9803 | 792 | dentry->d_fsdata = dir_version; |
1da177e4 | 793 | dput(parent); |
00d3b7a4 | 794 | key_put(key); |
1da177e4 LT |
795 | _leave(" = 1 [valid]"); |
796 | return 1; | |
797 | ||
798 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 799 | not_found: |
1da177e4 LT |
800 | spin_lock(&dentry->d_lock); |
801 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
802 | spin_unlock(&dentry->d_lock); | |
803 | ||
c435ee34 | 804 | out_bad_parent: |
a455589f | 805 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 806 | dput(parent); |
c435ee34 | 807 | out_bad: |
00d3b7a4 | 808 | key_put(key); |
1da177e4 LT |
809 | |
810 | _leave(" = 0 [bad]"); | |
811 | return 0; | |
ec26815a | 812 | } |
1da177e4 | 813 | |
1da177e4 LT |
814 | /* |
815 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
816 | * sleep) | |
817 | * - called from dput() when d_count is going to 0. | |
818 | * - return 1 to request dentry be unhashed, 0 otherwise | |
819 | */ | |
fe15ce44 | 820 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 821 | { |
a455589f | 822 | _enter("%pd", dentry); |
1da177e4 LT |
823 | |
824 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
825 | goto zap; | |
826 | ||
2b0143b5 DH |
827 | if (d_really_is_positive(dentry) && |
828 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
829 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 830 | goto zap; |
1da177e4 LT |
831 | |
832 | _leave(" = 0 [keep]"); | |
833 | return 0; | |
834 | ||
ec26815a | 835 | zap: |
1da177e4 LT |
836 | _leave(" = 1 [zap]"); |
837 | return 1; | |
ec26815a | 838 | } |
260a9803 DH |
839 | |
840 | /* | |
841 | * handle dentry release | |
842 | */ | |
843 | static void afs_d_release(struct dentry *dentry) | |
844 | { | |
a455589f | 845 | _enter("%pd", dentry); |
260a9803 DH |
846 | } |
847 | ||
d2ddc776 DH |
848 | /* |
849 | * Create a new inode for create/mkdir/symlink | |
850 | */ | |
851 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
852 | struct dentry *new_dentry, | |
853 | struct afs_fid *newfid, | |
854 | struct afs_file_status *newstatus, | |
855 | struct afs_callback *newcb) | |
856 | { | |
857 | struct inode *inode; | |
858 | ||
859 | if (fc->ac.error < 0) | |
860 | return; | |
861 | ||
bc1527dc DH |
862 | d_drop(new_dentry); |
863 | ||
d2ddc776 DH |
864 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
865 | newfid, newstatus, newcb, fc->cbi); | |
866 | if (IS_ERR(inode)) { | |
867 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
868 | * the new directory on the server. | |
869 | */ | |
870 | fc->ac.error = PTR_ERR(inode); | |
871 | return; | |
872 | } | |
873 | ||
bc1527dc | 874 | d_add(new_dentry, inode); |
d2ddc776 DH |
875 | } |
876 | ||
260a9803 DH |
877 | /* |
878 | * create a directory on an AFS filesystem | |
879 | */ | |
18bb1db3 | 880 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 881 | { |
d2ddc776 DH |
882 | struct afs_file_status newstatus; |
883 | struct afs_fs_cursor fc; | |
884 | struct afs_callback newcb; | |
885 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
886 | struct afs_fid newfid; | |
260a9803 DH |
887 | struct key *key; |
888 | int ret; | |
889 | ||
d2ddc776 | 890 | mode |= S_IFDIR; |
260a9803 | 891 | |
a455589f AV |
892 | _enter("{%x:%u},{%pd},%ho", |
893 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 894 | |
260a9803 DH |
895 | key = afs_request_key(dvnode->volume->cell); |
896 | if (IS_ERR(key)) { | |
897 | ret = PTR_ERR(key); | |
898 | goto error; | |
899 | } | |
900 | ||
d2ddc776 DH |
901 | ret = -ERESTARTSYS; |
902 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
903 | while (afs_select_fileserver(&fc)) { | |
904 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
905 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
906 | &newfid, &newstatus, &newcb); | |
907 | } | |
260a9803 | 908 | |
d2ddc776 DH |
909 | afs_check_for_remote_deletion(&fc, fc.vnode); |
910 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
911 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
912 | ret = afs_end_vnode_operation(&fc); | |
913 | if (ret < 0) | |
914 | goto error_key; | |
4433b691 DH |
915 | } else { |
916 | goto error_key; | |
260a9803 DH |
917 | } |
918 | ||
260a9803 DH |
919 | key_put(key); |
920 | _leave(" = 0"); | |
921 | return 0; | |
922 | ||
d2ddc776 | 923 | error_key: |
260a9803 DH |
924 | key_put(key); |
925 | error: | |
926 | d_drop(dentry); | |
927 | _leave(" = %d", ret); | |
928 | return ret; | |
929 | } | |
930 | ||
d2ddc776 DH |
931 | /* |
932 | * Remove a subdir from a directory. | |
933 | */ | |
934 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
935 | { | |
936 | if (d_really_is_positive(dentry)) { | |
937 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
938 | ||
939 | clear_nlink(&vnode->vfs_inode); | |
940 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
941 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
942 | } | |
943 | } | |
944 | ||
260a9803 DH |
945 | /* |
946 | * remove a directory from an AFS filesystem | |
947 | */ | |
948 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
949 | { | |
d2ddc776 DH |
950 | struct afs_fs_cursor fc; |
951 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 DH |
952 | struct key *key; |
953 | int ret; | |
954 | ||
a455589f AV |
955 | _enter("{%x:%u},{%pd}", |
956 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 957 | |
260a9803 DH |
958 | key = afs_request_key(dvnode->volume->cell); |
959 | if (IS_ERR(key)) { | |
960 | ret = PTR_ERR(key); | |
961 | goto error; | |
962 | } | |
963 | ||
d2ddc776 DH |
964 | ret = -ERESTARTSYS; |
965 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
966 | while (afs_select_fileserver(&fc)) { | |
967 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
968 | afs_fs_remove(&fc, dentry->d_name.name, true); | |
969 | } | |
260a9803 | 970 | |
d2ddc776 DH |
971 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
972 | ret = afs_end_vnode_operation(&fc); | |
973 | if (ret == 0) | |
974 | afs_dir_remove_subdir(dentry); | |
260a9803 DH |
975 | } |
976 | ||
977 | key_put(key); | |
260a9803 | 978 | error: |
260a9803 DH |
979 | return ret; |
980 | } | |
981 | ||
982 | /* | |
d2ddc776 DH |
983 | * Remove a link to a file or symlink from a directory. |
984 | * | |
985 | * If the file was not deleted due to excess hard links, the fileserver will | |
986 | * break the callback promise on the file - if it had one - before it returns | |
987 | * to us, and if it was deleted, it won't | |
988 | * | |
989 | * However, if we didn't have a callback promise outstanding, or it was | |
990 | * outstanding on a different server, then it won't break it either... | |
991 | */ | |
440fbc3a DH |
992 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
993 | unsigned long d_version_before, | |
994 | unsigned long d_version_after) | |
d2ddc776 | 995 | { |
440fbc3a | 996 | bool dir_valid; |
d2ddc776 DH |
997 | int ret = 0; |
998 | ||
440fbc3a DH |
999 | /* There were no intervening changes on the server if the version |
1000 | * number we got back was incremented by exactly 1. | |
1001 | */ | |
1002 | dir_valid = (d_version_after == d_version_before + 1); | |
1003 | ||
d2ddc776 DH |
1004 | if (d_really_is_positive(dentry)) { |
1005 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1006 | ||
440fbc3a DH |
1007 | if (dir_valid) { |
1008 | drop_nlink(&vnode->vfs_inode); | |
1009 | if (vnode->vfs_inode.i_nlink == 0) { | |
1010 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1011 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1012 | } | |
d2ddc776 | 1013 | ret = 0; |
440fbc3a DH |
1014 | } else { |
1015 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1016 | ||
1017 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1018 | kdebug("AFS_VNODE_DELETED"); | |
1019 | ||
1020 | ret = afs_validate(vnode, key); | |
1021 | if (ret == -ESTALE) | |
1022 | ret = 0; | |
1023 | } | |
d2ddc776 DH |
1024 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1025 | } | |
1026 | ||
1027 | return ret; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1032 | */ |
1033 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1034 | { | |
d2ddc776 DH |
1035 | struct afs_fs_cursor fc; |
1036 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 | 1037 | struct key *key; |
440fbc3a | 1038 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
260a9803 DH |
1039 | int ret; |
1040 | ||
a455589f AV |
1041 | _enter("{%x:%u},{%pd}", |
1042 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1043 | |
45222b9e | 1044 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1045 | return -ENAMETOOLONG; |
260a9803 DH |
1046 | |
1047 | key = afs_request_key(dvnode->volume->cell); | |
1048 | if (IS_ERR(key)) { | |
1049 | ret = PTR_ERR(key); | |
1050 | goto error; | |
1051 | } | |
1052 | ||
d2ddc776 | 1053 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1054 | if (d_really_is_positive(dentry)) { |
1055 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1056 | ret = afs_validate(vnode, key); |
1057 | if (ret < 0) | |
d2ddc776 | 1058 | goto error_key; |
260a9803 DH |
1059 | } |
1060 | ||
d2ddc776 DH |
1061 | ret = -ERESTARTSYS; |
1062 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1063 | while (afs_select_fileserver(&fc)) { | |
1064 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1065 | afs_fs_remove(&fc, dentry->d_name.name, false); | |
1066 | } | |
260a9803 | 1067 | |
d2ddc776 DH |
1068 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1069 | ret = afs_end_vnode_operation(&fc); | |
1070 | if (ret == 0) | |
440fbc3a DH |
1071 | ret = afs_dir_remove_link( |
1072 | dentry, key, d_version, | |
1073 | (unsigned long)dvnode->status.data_version); | |
260a9803 DH |
1074 | } |
1075 | ||
d2ddc776 | 1076 | error_key: |
260a9803 DH |
1077 | key_put(key); |
1078 | error: | |
1079 | _leave(" = %d", ret); | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * create a regular file on an AFS filesystem | |
1085 | */ | |
4acdaf27 | 1086 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1087 | bool excl) |
260a9803 | 1088 | { |
d2ddc776 DH |
1089 | struct afs_fs_cursor fc; |
1090 | struct afs_file_status newstatus; | |
1091 | struct afs_callback newcb; | |
43dd388b | 1092 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1093 | struct afs_fid newfid; |
260a9803 DH |
1094 | struct key *key; |
1095 | int ret; | |
1096 | ||
d2ddc776 | 1097 | mode |= S_IFREG; |
260a9803 | 1098 | |
a455589f AV |
1099 | _enter("{%x:%u},{%pd},%ho,", |
1100 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1101 | |
d2ddc776 DH |
1102 | ret = -ENAMETOOLONG; |
1103 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1104 | goto error; | |
1105 | ||
260a9803 DH |
1106 | key = afs_request_key(dvnode->volume->cell); |
1107 | if (IS_ERR(key)) { | |
1108 | ret = PTR_ERR(key); | |
1109 | goto error; | |
1110 | } | |
1111 | ||
d2ddc776 DH |
1112 | ret = -ERESTARTSYS; |
1113 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1114 | while (afs_select_fileserver(&fc)) { | |
1115 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1116 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1117 | &newfid, &newstatus, &newcb); | |
1118 | } | |
260a9803 | 1119 | |
d2ddc776 DH |
1120 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1121 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1122 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1123 | ret = afs_end_vnode_operation(&fc); | |
1124 | if (ret < 0) | |
1125 | goto error_key; | |
4433b691 DH |
1126 | } else { |
1127 | goto error_key; | |
260a9803 DH |
1128 | } |
1129 | ||
260a9803 DH |
1130 | key_put(key); |
1131 | _leave(" = 0"); | |
1132 | return 0; | |
1133 | ||
d2ddc776 | 1134 | error_key: |
260a9803 DH |
1135 | key_put(key); |
1136 | error: | |
1137 | d_drop(dentry); | |
1138 | _leave(" = %d", ret); | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * create a hard link between files in an AFS filesystem | |
1144 | */ | |
1145 | static int afs_link(struct dentry *from, struct inode *dir, | |
1146 | struct dentry *dentry) | |
1147 | { | |
d2ddc776 | 1148 | struct afs_fs_cursor fc; |
260a9803 DH |
1149 | struct afs_vnode *dvnode, *vnode; |
1150 | struct key *key; | |
1151 | int ret; | |
1152 | ||
2b0143b5 | 1153 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 DH |
1154 | dvnode = AFS_FS_I(dir); |
1155 | ||
a455589f | 1156 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1157 | vnode->fid.vid, vnode->fid.vnode, |
1158 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1159 | dentry); |
260a9803 | 1160 | |
d2ddc776 DH |
1161 | ret = -ENAMETOOLONG; |
1162 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1163 | goto error; | |
1164 | ||
260a9803 DH |
1165 | key = afs_request_key(dvnode->volume->cell); |
1166 | if (IS_ERR(key)) { | |
1167 | ret = PTR_ERR(key); | |
1168 | goto error; | |
1169 | } | |
1170 | ||
d2ddc776 DH |
1171 | ret = -ERESTARTSYS; |
1172 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1173 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1174 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1175 | goto error_key; |
d2ddc776 DH |
1176 | } |
1177 | ||
1178 | while (afs_select_fileserver(&fc)) { | |
1179 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1180 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
1181 | afs_fs_link(&fc, vnode, dentry->d_name.name); | |
1182 | } | |
1183 | ||
1184 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1185 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1186 | ihold(&vnode->vfs_inode); | |
1187 | d_instantiate(dentry, &vnode->vfs_inode); | |
1188 | ||
1189 | mutex_unlock(&vnode->io_lock); | |
1190 | ret = afs_end_vnode_operation(&fc); | |
1191 | if (ret < 0) | |
1192 | goto error_key; | |
4433b691 DH |
1193 | } else { |
1194 | goto error_key; | |
d2ddc776 | 1195 | } |
260a9803 | 1196 | |
260a9803 DH |
1197 | key_put(key); |
1198 | _leave(" = 0"); | |
1199 | return 0; | |
1200 | ||
d2ddc776 | 1201 | error_key: |
260a9803 DH |
1202 | key_put(key); |
1203 | error: | |
1204 | d_drop(dentry); | |
1205 | _leave(" = %d", ret); | |
1206 | return ret; | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * create a symlink in an AFS filesystem | |
1211 | */ | |
1212 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1213 | const char *content) | |
1214 | { | |
d2ddc776 DH |
1215 | struct afs_fs_cursor fc; |
1216 | struct afs_file_status newstatus; | |
1217 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1218 | struct afs_fid newfid; | |
260a9803 DH |
1219 | struct key *key; |
1220 | int ret; | |
1221 | ||
a455589f AV |
1222 | _enter("{%x:%u},{%pd},%s", |
1223 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1224 | content); |
1225 | ||
d2ddc776 DH |
1226 | ret = -ENAMETOOLONG; |
1227 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1228 | goto error; | |
1229 | ||
260a9803 | 1230 | ret = -EINVAL; |
45222b9e | 1231 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1232 | goto error; |
1233 | ||
1234 | key = afs_request_key(dvnode->volume->cell); | |
1235 | if (IS_ERR(key)) { | |
1236 | ret = PTR_ERR(key); | |
1237 | goto error; | |
1238 | } | |
1239 | ||
d2ddc776 DH |
1240 | ret = -ERESTARTSYS; |
1241 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1242 | while (afs_select_fileserver(&fc)) { | |
1243 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1244 | afs_fs_symlink(&fc, dentry->d_name.name, content, | |
1245 | &newfid, &newstatus); | |
1246 | } | |
260a9803 | 1247 | |
d2ddc776 DH |
1248 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1249 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1250 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1251 | ret = afs_end_vnode_operation(&fc); | |
1252 | if (ret < 0) | |
1253 | goto error_key; | |
4433b691 DH |
1254 | } else { |
1255 | goto error_key; | |
260a9803 DH |
1256 | } |
1257 | ||
260a9803 DH |
1258 | key_put(key); |
1259 | _leave(" = 0"); | |
1260 | return 0; | |
1261 | ||
d2ddc776 | 1262 | error_key: |
260a9803 DH |
1263 | key_put(key); |
1264 | error: | |
1265 | d_drop(dentry); | |
1266 | _leave(" = %d", ret); | |
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * rename a file in an AFS filesystem and/or move it between directories | |
1272 | */ | |
1273 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1274 | struct inode *new_dir, struct dentry *new_dentry, |
1275 | unsigned int flags) | |
260a9803 | 1276 | { |
d2ddc776 | 1277 | struct afs_fs_cursor fc; |
260a9803 DH |
1278 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1279 | struct key *key; | |
1280 | int ret; | |
1281 | ||
1cd66c93 MS |
1282 | if (flags) |
1283 | return -EINVAL; | |
1284 | ||
2b0143b5 | 1285 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1286 | orig_dvnode = AFS_FS_I(old_dir); |
1287 | new_dvnode = AFS_FS_I(new_dir); | |
1288 | ||
a455589f | 1289 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1290 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1291 | vnode->fid.vid, vnode->fid.vnode, | |
1292 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1293 | new_dentry); |
260a9803 | 1294 | |
260a9803 DH |
1295 | key = afs_request_key(orig_dvnode->volume->cell); |
1296 | if (IS_ERR(key)) { | |
1297 | ret = PTR_ERR(key); | |
1298 | goto error; | |
1299 | } | |
1300 | ||
d2ddc776 DH |
1301 | ret = -ERESTARTSYS; |
1302 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1303 | if (orig_dvnode != new_dvnode) { | |
1304 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1305 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1306 | goto error_key; |
d2ddc776 DH |
1307 | } |
1308 | } | |
1309 | while (afs_select_fileserver(&fc)) { | |
1310 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1311 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1312 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
1313 | new_dvnode, new_dentry->d_name.name); | |
1314 | } | |
1315 | ||
1316 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1317 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1318 | if (orig_dvnode != new_dvnode) | |
1319 | mutex_unlock(&new_dvnode->io_lock); | |
1320 | ret = afs_end_vnode_operation(&fc); | |
1321 | if (ret < 0) | |
1322 | goto error_key; | |
1323 | } | |
1324 | ||
d2ddc776 | 1325 | error_key: |
260a9803 DH |
1326 | key_put(key); |
1327 | error: | |
260a9803 DH |
1328 | _leave(" = %d", ret); |
1329 | return ret; | |
1330 | } |