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1da177e4 LT |
1 | /* dir.c: AFS filesystem directory handling |
2 | * | |
f3ddee8d | 3 | * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
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> | |
1da177e4 | 13 | #include <linux/fs.h> |
34286d66 | 14 | #include <linux/namei.h> |
1da177e4 | 15 | #include <linux/pagemap.h> |
f3ddee8d | 16 | #include <linux/swap.h> |
00d3b7a4 | 17 | #include <linux/ctype.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
f3ddee8d | 19 | #include <linux/task_io_accounting_ops.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); |
5cf9dd55 | 28 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 29 | loff_t fpos, u64 ino, unsigned dtype); |
5cf9dd55 DH |
30 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
31 | loff_t fpos, u64 ino, unsigned dtype); | |
4acdaf27 | 32 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 33 | bool excl); |
18bb1db3 | 34 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
35 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
36 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
37 | static int afs_link(struct dentry *from, struct inode *dir, | |
38 | struct dentry *dentry); | |
39 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
40 | const char *content); | |
41 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
42 | struct inode *new_dir, struct dentry *new_dentry, |
43 | unsigned int flags); | |
f3ddee8d DH |
44 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
45 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
46 | unsigned int length); | |
47 | ||
48 | static int afs_dir_set_page_dirty(struct page *page) | |
49 | { | |
50 | BUG(); /* This should never happen. */ | |
51 | } | |
1da177e4 | 52 | |
4b6f5d20 | 53 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 54 | .open = afs_dir_open, |
00d3b7a4 | 55 | .release = afs_release, |
29884eff | 56 | .iterate_shared = afs_readdir, |
e8d6c554 | 57 | .lock = afs_lock, |
3222a3e5 | 58 | .llseek = generic_file_llseek, |
1da177e4 LT |
59 | }; |
60 | ||
754661f1 | 61 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
62 | .create = afs_create, |
63 | .lookup = afs_lookup, | |
64 | .link = afs_link, | |
65 | .unlink = afs_unlink, | |
66 | .symlink = afs_symlink, | |
67 | .mkdir = afs_mkdir, | |
68 | .rmdir = afs_rmdir, | |
2773bf00 | 69 | .rename = afs_rename, |
00d3b7a4 | 70 | .permission = afs_permission, |
416351f2 | 71 | .getattr = afs_getattr, |
31143d5d | 72 | .setattr = afs_setattr, |
d3e3b7ea | 73 | .listxattr = afs_listxattr, |
1da177e4 LT |
74 | }; |
75 | ||
f3ddee8d DH |
76 | const struct address_space_operations afs_dir_aops = { |
77 | .set_page_dirty = afs_dir_set_page_dirty, | |
78 | .releasepage = afs_dir_releasepage, | |
79 | .invalidatepage = afs_dir_invalidatepage, | |
80 | }; | |
81 | ||
d61dcce2 | 82 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
83 | .d_revalidate = afs_d_revalidate, |
84 | .d_delete = afs_d_delete, | |
260a9803 | 85 | .d_release = afs_d_release, |
d18610b0 | 86 | .d_automount = afs_d_automount, |
1da177e4 LT |
87 | }; |
88 | ||
89 | #define AFS_DIR_HASHTBL_SIZE 128 | |
90 | #define AFS_DIR_DIRENT_SIZE 32 | |
91 | #define AFS_DIRENT_PER_BLOCK 64 | |
92 | ||
93 | union afs_dirent { | |
94 | struct { | |
95 | uint8_t valid; | |
96 | uint8_t unused[1]; | |
97 | __be16 hash_next; | |
98 | __be32 vnode; | |
99 | __be32 unique; | |
100 | uint8_t name[16]; | |
101 | uint8_t overflow[4]; /* if any char of the name (inc | |
102 | * NUL) reaches here, consume | |
103 | * the next dirent too */ | |
104 | } u; | |
105 | uint8_t extended_name[32]; | |
106 | }; | |
107 | ||
108 | /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ | |
109 | struct afs_dir_pagehdr { | |
110 | __be16 npages; | |
111 | __be16 magic; | |
112 | #define AFS_DIR_MAGIC htons(1234) | |
113 | uint8_t nentries; | |
114 | uint8_t bitmap[8]; | |
115 | uint8_t pad[19]; | |
116 | }; | |
117 | ||
118 | /* directory block layout */ | |
119 | union afs_dir_block { | |
120 | ||
121 | struct afs_dir_pagehdr pagehdr; | |
122 | ||
123 | struct { | |
124 | struct afs_dir_pagehdr pagehdr; | |
125 | uint8_t alloc_ctrs[128]; | |
126 | /* dir hash table */ | |
127 | uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; | |
128 | } hdr; | |
129 | ||
130 | union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; | |
131 | }; | |
132 | ||
133 | /* layout on a linux VM page */ | |
134 | struct afs_dir_page { | |
135 | union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; | |
136 | }; | |
137 | ||
5cf9dd55 DH |
138 | struct afs_lookup_one_cookie { |
139 | struct dir_context ctx; | |
140 | struct qstr name; | |
141 | bool found; | |
142 | struct afs_fid fid; | |
143 | }; | |
144 | ||
260a9803 | 145 | struct afs_lookup_cookie { |
5cf9dd55 DH |
146 | struct dir_context ctx; |
147 | struct qstr name; | |
148 | bool found; | |
149 | bool one_only; | |
150 | unsigned short nr_fids; | |
151 | struct afs_file_status *statuses; | |
152 | struct afs_callback *callbacks; | |
153 | struct afs_fid fids[50]; | |
1da177e4 LT |
154 | }; |
155 | ||
1da177e4 LT |
156 | /* |
157 | * check that a directory page is valid | |
158 | */ | |
f3ddee8d DH |
159 | static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
160 | loff_t i_size) | |
1da177e4 LT |
161 | { |
162 | struct afs_dir_page *dbuf; | |
f3ddee8d | 163 | loff_t latter, off; |
1da177e4 LT |
164 | int tmp, qty; |
165 | ||
dab17c1a DH |
166 | /* Determine how many magic numbers there should be in this page, but |
167 | * we must take care because the directory may change size under us. | |
168 | */ | |
169 | off = page_offset(page); | |
dab17c1a DH |
170 | if (i_size <= off) |
171 | goto checked; | |
172 | ||
173 | latter = i_size - off; | |
1da177e4 LT |
174 | if (latter >= PAGE_SIZE) |
175 | qty = PAGE_SIZE; | |
176 | else | |
177 | qty = latter; | |
178 | qty /= sizeof(union afs_dir_block); | |
179 | ||
180 | /* check them */ | |
181 | dbuf = page_address(page); | |
182 | for (tmp = 0; tmp < qty; tmp++) { | |
183 | if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { | |
dab17c1a | 184 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
f3ddee8d | 185 | __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
1da177e4 | 186 | ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
f3ddee8d | 187 | trace_afs_dir_check_failed(dvnode, off, i_size); |
1da177e4 LT |
188 | goto error; |
189 | } | |
190 | } | |
191 | ||
dab17c1a | 192 | checked: |
f3ddee8d | 193 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 194 | return true; |
1da177e4 | 195 | |
ec26815a | 196 | error: |
be5b82db | 197 | return false; |
ec26815a | 198 | } |
1da177e4 | 199 | |
1da177e4 LT |
200 | /* |
201 | * open an AFS directory file | |
202 | */ | |
203 | static int afs_dir_open(struct inode *inode, struct file *file) | |
204 | { | |
205 | _enter("{%lu}", inode->i_ino); | |
206 | ||
2ecd05ae AD |
207 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
208 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
1da177e4 | 209 | |
08e0e7c8 | 210 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
211 | return -ENOENT; |
212 | ||
00d3b7a4 | 213 | return afs_open(inode, file); |
ec26815a | 214 | } |
1da177e4 | 215 | |
f3ddee8d DH |
216 | /* |
217 | * Read the directory into the pagecache in one go, scrubbing the previous | |
218 | * contents. The list of pages is returned, pinning them so that they don't | |
219 | * get reclaimed during the iteration. | |
220 | */ | |
221 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
222 | { | |
223 | struct afs_read *req; | |
224 | loff_t i_size; | |
225 | int nr_pages, nr_inline, i, n; | |
226 | int ret = -ENOMEM; | |
227 | ||
228 | retry: | |
229 | i_size = i_size_read(&dvnode->vfs_inode); | |
230 | if (i_size < 2048) | |
231 | return ERR_PTR(-EIO); | |
232 | if (i_size > 2048 * 1024) | |
233 | return ERR_PTR(-EFBIG); | |
234 | ||
235 | _enter("%llu", i_size); | |
236 | ||
237 | /* Get a request record to hold the page list. We want to hold it | |
238 | * inline if we can, but we don't want to make an order 1 allocation. | |
239 | */ | |
240 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
241 | nr_inline = nr_pages; | |
242 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
243 | nr_inline = 0; | |
244 | ||
245 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
246 | GFP_KERNEL); | |
247 | if (!req) | |
248 | return ERR_PTR(-ENOMEM); | |
249 | ||
250 | refcount_set(&req->usage, 1); | |
251 | req->nr_pages = nr_pages; | |
252 | req->actual_len = i_size; /* May change */ | |
253 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
254 | req->data_version = dvnode->status.data_version; /* May change */ | |
255 | if (nr_inline > 0) { | |
256 | req->pages = req->array; | |
257 | } else { | |
258 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
259 | GFP_KERNEL); | |
260 | if (!req->pages) | |
261 | goto error; | |
262 | } | |
263 | ||
264 | /* Get a list of all the pages that hold or will hold the directory | |
265 | * content. We need to fill in any gaps that we might find where the | |
266 | * memory reclaimer has been at work. If there are any gaps, we will | |
267 | * need to reread the entire directory contents. | |
268 | */ | |
269 | i = 0; | |
270 | do { | |
271 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
272 | req->nr_pages - i, | |
273 | req->pages + i); | |
274 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
275 | if (n == 0) { | |
276 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
277 | ||
278 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
279 | afs_stat_v(dvnode, n_inval); | |
280 | ||
281 | ret = -ENOMEM; | |
282 | req->pages[i] = __page_cache_alloc(gfp); | |
283 | if (!req->pages[i]) | |
284 | goto error; | |
285 | ret = add_to_page_cache_lru(req->pages[i], | |
286 | dvnode->vfs_inode.i_mapping, | |
287 | i, gfp); | |
288 | if (ret < 0) | |
289 | goto error; | |
290 | ||
291 | set_page_private(req->pages[i], 1); | |
292 | SetPagePrivate(req->pages[i]); | |
293 | unlock_page(req->pages[i]); | |
294 | i++; | |
295 | } else { | |
296 | i += n; | |
297 | } | |
298 | } while (i < req->nr_pages); | |
299 | ||
300 | /* If we're going to reload, we need to lock all the pages to prevent | |
301 | * races. | |
302 | */ | |
303 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
304 | ret = -ERESTARTSYS; | |
305 | for (i = 0; i < req->nr_pages; i++) | |
306 | if (lock_page_killable(req->pages[i]) < 0) | |
307 | goto error_unlock; | |
308 | ||
309 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
310 | goto success; | |
311 | ||
312 | ret = afs_fetch_data(dvnode, key, req); | |
313 | if (ret < 0) | |
314 | goto error_unlock_all; | |
315 | ||
316 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
317 | ||
318 | if (req->len < req->file_size) | |
319 | goto content_has_grown; | |
320 | ||
321 | /* Validate the data we just read. */ | |
322 | ret = -EIO; | |
323 | for (i = 0; i < req->nr_pages; i++) | |
324 | if (!afs_dir_check_page(dvnode, req->pages[i], | |
325 | req->actual_len)) | |
326 | goto error_unlock_all; | |
327 | ||
328 | // TODO: Trim excess pages | |
329 | ||
330 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
331 | } | |
332 | ||
333 | success: | |
334 | i = req->nr_pages; | |
335 | while (i > 0) | |
336 | unlock_page(req->pages[--i]); | |
337 | return req; | |
338 | ||
339 | error_unlock_all: | |
340 | i = req->nr_pages; | |
341 | error_unlock: | |
342 | while (i > 0) | |
343 | unlock_page(req->pages[--i]); | |
344 | error: | |
345 | afs_put_read(req); | |
346 | _leave(" = %d", ret); | |
347 | return ERR_PTR(ret); | |
348 | ||
349 | content_has_grown: | |
350 | i = req->nr_pages; | |
351 | while (i > 0) | |
352 | unlock_page(req->pages[--i]); | |
353 | afs_put_read(req); | |
354 | goto retry; | |
355 | } | |
356 | ||
1da177e4 LT |
357 | /* |
358 | * deal with one block in an AFS directory | |
359 | */ | |
1bbae9f8 | 360 | static int afs_dir_iterate_block(struct dir_context *ctx, |
1da177e4 | 361 | union afs_dir_block *block, |
1bbae9f8 | 362 | unsigned blkoff) |
1da177e4 LT |
363 | { |
364 | union afs_dirent *dire; | |
365 | unsigned offset, next, curr; | |
366 | size_t nlen; | |
1bbae9f8 | 367 | int tmp; |
1da177e4 | 368 | |
1bbae9f8 | 369 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 370 | |
1bbae9f8 | 371 | curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); |
1da177e4 LT |
372 | |
373 | /* walk through the block, an entry at a time */ | |
374 | for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; | |
375 | offset < AFS_DIRENT_PER_BLOCK; | |
376 | offset = next | |
377 | ) { | |
378 | next = offset + 1; | |
379 | ||
380 | /* skip entries marked unused in the bitmap */ | |
381 | if (!(block->pagehdr.bitmap[offset / 8] & | |
382 | (1 << (offset % 8)))) { | |
5b5e0928 | 383 | _debug("ENT[%zu.%u]: unused", |
1da177e4 LT |
384 | blkoff / sizeof(union afs_dir_block), offset); |
385 | if (offset >= curr) | |
1bbae9f8 | 386 | ctx->pos = blkoff + |
1da177e4 LT |
387 | next * sizeof(union afs_dirent); |
388 | continue; | |
389 | } | |
390 | ||
391 | /* got a valid entry */ | |
392 | dire = &block->dirents[offset]; | |
393 | nlen = strnlen(dire->u.name, | |
394 | sizeof(*block) - | |
395 | offset * sizeof(union afs_dirent)); | |
396 | ||
5b5e0928 | 397 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
1da177e4 LT |
398 | blkoff / sizeof(union afs_dir_block), offset, |
399 | (offset < curr ? "skip" : "fill"), | |
400 | nlen, dire->u.name); | |
401 | ||
402 | /* work out where the next possible entry is */ | |
403 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { | |
404 | if (next >= AFS_DIRENT_PER_BLOCK) { | |
5b5e0928 | 405 | _debug("ENT[%zu.%u]:" |
1da177e4 | 406 | " %u travelled beyond end dir block" |
5b5e0928 | 407 | " (len %u/%zu)", |
1da177e4 LT |
408 | blkoff / sizeof(union afs_dir_block), |
409 | offset, next, tmp, nlen); | |
410 | return -EIO; | |
411 | } | |
412 | if (!(block->pagehdr.bitmap[next / 8] & | |
413 | (1 << (next % 8)))) { | |
5b5e0928 AD |
414 | _debug("ENT[%zu.%u]:" |
415 | " %u unmarked extension (len %u/%zu)", | |
1da177e4 LT |
416 | blkoff / sizeof(union afs_dir_block), |
417 | offset, next, tmp, nlen); | |
418 | return -EIO; | |
419 | } | |
420 | ||
5b5e0928 | 421 | _debug("ENT[%zu.%u]: ext %u/%zu", |
1da177e4 LT |
422 | blkoff / sizeof(union afs_dir_block), |
423 | next, tmp, nlen); | |
424 | next++; | |
425 | } | |
426 | ||
427 | /* skip if starts before the current position */ | |
428 | if (offset < curr) | |
429 | continue; | |
430 | ||
431 | /* found the next entry */ | |
1bbae9f8 | 432 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 433 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
434 | (ctx->actor == afs_lookup_filldir || |
435 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 436 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
437 | _leave(" = 0 [full]"); |
438 | return 0; | |
439 | } | |
440 | ||
1bbae9f8 | 441 | ctx->pos = blkoff + next * sizeof(union afs_dirent); |
1da177e4 LT |
442 | } |
443 | ||
444 | _leave(" = 1 [more]"); | |
445 | return 1; | |
ec26815a | 446 | } |
1da177e4 | 447 | |
1da177e4 | 448 | /* |
08e0e7c8 | 449 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 450 | */ |
1bbae9f8 AV |
451 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
452 | struct key *key) | |
1da177e4 | 453 | { |
f3ddee8d | 454 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 455 | union afs_dir_block *dblock; |
1da177e4 | 456 | struct afs_dir_page *dbuf; |
f3ddee8d | 457 | struct afs_read *req; |
1da177e4 LT |
458 | struct page *page; |
459 | unsigned blkoff, limit; | |
460 | int ret; | |
461 | ||
1bbae9f8 | 462 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 463 | |
08e0e7c8 | 464 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
465 | _leave(" = -ESTALE"); |
466 | return -ESTALE; | |
467 | } | |
468 | ||
f3ddee8d DH |
469 | req = afs_read_dir(dvnode, key); |
470 | if (IS_ERR(req)) | |
471 | return PTR_ERR(req); | |
472 | ||
1da177e4 | 473 | /* round the file position up to the next entry boundary */ |
1bbae9f8 AV |
474 | ctx->pos += sizeof(union afs_dirent) - 1; |
475 | ctx->pos &= ~(sizeof(union afs_dirent) - 1); | |
1da177e4 LT |
476 | |
477 | /* walk through the blocks in sequence */ | |
478 | ret = 0; | |
f3ddee8d | 479 | while (ctx->pos < req->actual_len) { |
1bbae9f8 | 480 | blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); |
1da177e4 | 481 | |
f3ddee8d DH |
482 | /* Fetch the appropriate page from the directory and re-add it |
483 | * to the LRU. | |
484 | */ | |
485 | page = req->pages[blkoff / PAGE_SIZE]; | |
486 | if (!page) { | |
487 | ret = -EIO; | |
1da177e4 LT |
488 | break; |
489 | } | |
f3ddee8d | 490 | mark_page_accessed(page); |
1da177e4 LT |
491 | |
492 | limit = blkoff & ~(PAGE_SIZE - 1); | |
493 | ||
f3ddee8d | 494 | dbuf = kmap(page); |
1da177e4 LT |
495 | |
496 | /* deal with the individual blocks stashed on this page */ | |
497 | do { | |
498 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
499 | sizeof(union afs_dir_block)]; | |
1bbae9f8 | 500 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 | 501 | if (ret != 1) { |
f3ddee8d | 502 | kunmap(page); |
1da177e4 LT |
503 | goto out; |
504 | } | |
505 | ||
506 | blkoff += sizeof(union afs_dir_block); | |
507 | ||
1bbae9f8 | 508 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 509 | |
f3ddee8d | 510 | kunmap(page); |
1da177e4 LT |
511 | ret = 0; |
512 | } | |
513 | ||
ec26815a | 514 | out: |
f3ddee8d | 515 | afs_put_read(req); |
1da177e4 LT |
516 | _leave(" = %d", ret); |
517 | return ret; | |
ec26815a | 518 | } |
1da177e4 | 519 | |
1da177e4 LT |
520 | /* |
521 | * read an AFS directory | |
522 | */ | |
1bbae9f8 | 523 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 524 | { |
215804a9 | 525 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 526 | } |
1da177e4 | 527 | |
1da177e4 | 528 | /* |
5cf9dd55 | 529 | * Search the directory for a single name |
1da177e4 LT |
530 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
531 | * uniquifier through dtype | |
532 | */ | |
5cf9dd55 DH |
533 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
534 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 535 | { |
5cf9dd55 DH |
536 | struct afs_lookup_one_cookie *cookie = |
537 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 538 | |
1bbae9f8 AV |
539 | _enter("{%s,%u},%s,%u,,%llu,%u", |
540 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 541 | (unsigned long long) ino, dtype); |
1da177e4 | 542 | |
08e0e7c8 DH |
543 | /* insanity checks first */ |
544 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
545 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
546 | ||
1bbae9f8 AV |
547 | if (cookie->name.len != nlen || |
548 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
549 | _leave(" = 0 [no]"); |
550 | return 0; | |
551 | } | |
552 | ||
553 | cookie->fid.vnode = ino; | |
554 | cookie->fid.unique = dtype; | |
555 | cookie->found = 1; | |
556 | ||
557 | _leave(" = -1 [found]"); | |
558 | return -1; | |
ec26815a | 559 | } |
1da177e4 | 560 | |
1da177e4 | 561 | /* |
5cf9dd55 | 562 | * Do a lookup of a single name in a directory |
260a9803 | 563 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 564 | */ |
5cf9dd55 DH |
565 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
566 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 567 | { |
1bbae9f8 | 568 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
569 | struct afs_lookup_one_cookie cookie = { |
570 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
571 | .name = dentry->d_name, |
572 | .fid.vid = as->volume->vid | |
573 | }; | |
1da177e4 LT |
574 | int ret; |
575 | ||
a455589f | 576 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 577 | |
1da177e4 | 578 | /* search the directory */ |
1bbae9f8 | 579 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 580 | if (ret < 0) { |
08e0e7c8 DH |
581 | _leave(" = %d [iter]", ret); |
582 | return ret; | |
1da177e4 LT |
583 | } |
584 | ||
585 | ret = -ENOENT; | |
586 | if (!cookie.found) { | |
08e0e7c8 DH |
587 | _leave(" = -ENOENT [not found]"); |
588 | return -ENOENT; | |
1da177e4 LT |
589 | } |
590 | ||
08e0e7c8 DH |
591 | *fid = cookie.fid; |
592 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
593 | return 0; | |
594 | } | |
595 | ||
5cf9dd55 DH |
596 | /* |
597 | * search the directory for a name | |
598 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
599 | * uniquifier through dtype | |
600 | */ | |
601 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
602 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
603 | { | |
604 | struct afs_lookup_cookie *cookie = | |
605 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
606 | int ret; | |
607 | ||
608 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
609 | cookie->name.name, cookie->name.len, name, nlen, | |
610 | (unsigned long long) ino, dtype); | |
611 | ||
612 | /* insanity checks first */ | |
613 | BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); | |
614 | BUILD_BUG_ON(sizeof(union afs_dirent) != 32); | |
615 | ||
616 | if (cookie->found) { | |
617 | if (cookie->nr_fids < 50) { | |
618 | cookie->fids[cookie->nr_fids].vnode = ino; | |
619 | cookie->fids[cookie->nr_fids].unique = dtype; | |
620 | cookie->nr_fids++; | |
621 | } | |
622 | } else if (cookie->name.len == nlen && | |
623 | memcmp(cookie->name.name, name, nlen) == 0) { | |
624 | cookie->fids[0].vnode = ino; | |
625 | cookie->fids[0].unique = dtype; | |
626 | cookie->found = 1; | |
627 | if (cookie->one_only) | |
628 | return -1; | |
629 | } | |
630 | ||
631 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
632 | _leave(" = %d", ret); | |
633 | return ret; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
638 | * files in one go and create inodes for them. The inode of the file we were | |
639 | * asked for is returned. | |
640 | */ | |
641 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
642 | struct key *key) | |
643 | { | |
644 | struct afs_lookup_cookie *cookie; | |
645 | struct afs_cb_interest *cbi = NULL; | |
646 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
647 | struct afs_iget_data data; | |
648 | struct afs_fs_cursor fc; | |
649 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
650 | struct inode *inode = NULL; | |
651 | int ret, i; | |
652 | ||
653 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
654 | ||
655 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
656 | if (!cookie) | |
657 | return ERR_PTR(-ENOMEM); | |
658 | ||
659 | cookie->ctx.actor = afs_lookup_filldir; | |
660 | cookie->name = dentry->d_name; | |
661 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
662 | ||
663 | read_seqlock_excl(&dvnode->cb_lock); | |
664 | if (dvnode->cb_interest && | |
665 | dvnode->cb_interest->server && | |
666 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
667 | cookie->one_only = true; | |
668 | read_sequnlock_excl(&dvnode->cb_lock); | |
669 | ||
670 | for (i = 0; i < 50; i++) | |
671 | cookie->fids[i].vid = as->volume->vid; | |
672 | ||
673 | /* search the directory */ | |
674 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
675 | if (ret < 0) { | |
676 | inode = ERR_PTR(ret); | |
677 | goto out; | |
678 | } | |
679 | ||
680 | inode = ERR_PTR(-ENOENT); | |
681 | if (!cookie->found) | |
682 | goto out; | |
683 | ||
684 | /* Check to see if we already have an inode for the primary fid. */ | |
685 | data.volume = dvnode->volume; | |
686 | data.fid = cookie->fids[0]; | |
687 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
688 | if (inode) | |
689 | goto out; | |
690 | ||
691 | /* Need space for examining all the selected files */ | |
692 | inode = ERR_PTR(-ENOMEM); | |
693 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
694 | GFP_KERNEL); | |
695 | if (!cookie->statuses) | |
696 | goto out; | |
697 | ||
698 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
699 | GFP_KERNEL); | |
700 | if (!cookie->callbacks) | |
701 | goto out_s; | |
702 | ||
703 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
704 | * lookups contained therein are stored in the reply without aborting | |
705 | * the whole operation. | |
706 | */ | |
707 | if (cookie->one_only) | |
708 | goto no_inline_bulk_status; | |
709 | ||
710 | inode = ERR_PTR(-ERESTARTSYS); | |
711 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
712 | while (afs_select_fileserver(&fc)) { | |
713 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
714 | &fc.cbi->server->flags)) { | |
715 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
716 | fc.ac.error = -ECONNABORTED; | |
717 | break; | |
718 | } | |
719 | afs_fs_inline_bulk_status(&fc, | |
720 | afs_v2net(dvnode), | |
721 | cookie->fids, | |
722 | cookie->statuses, | |
723 | cookie->callbacks, | |
724 | cookie->nr_fids, NULL); | |
725 | } | |
726 | ||
727 | if (fc.ac.error == 0) | |
728 | cbi = afs_get_cb_interest(fc.cbi); | |
729 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
730 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
731 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
732 | } | |
733 | ||
734 | if (!IS_ERR(inode)) | |
735 | goto success; | |
736 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
737 | goto out_c; | |
738 | ||
739 | no_inline_bulk_status: | |
740 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
741 | * any of the lookups fails - so, for the moment, revert to | |
742 | * FS.FetchStatus for just the primary fid. | |
743 | */ | |
744 | cookie->nr_fids = 1; | |
745 | inode = ERR_PTR(-ERESTARTSYS); | |
746 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
747 | while (afs_select_fileserver(&fc)) { | |
748 | afs_fs_fetch_status(&fc, | |
749 | afs_v2net(dvnode), | |
750 | cookie->fids, | |
751 | cookie->statuses, | |
752 | cookie->callbacks, | |
753 | NULL); | |
754 | } | |
755 | ||
756 | if (fc.ac.error == 0) | |
757 | cbi = afs_get_cb_interest(fc.cbi); | |
758 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
759 | } | |
760 | ||
761 | if (IS_ERR(inode)) | |
762 | goto out_c; | |
763 | ||
764 | for (i = 0; i < cookie->nr_fids; i++) | |
765 | cookie->statuses[i].abort_code = 0; | |
766 | ||
767 | success: | |
768 | /* Turn all the files into inodes and save the first one - which is the | |
769 | * one we actually want. | |
770 | */ | |
771 | if (cookie->statuses[0].abort_code != 0) | |
772 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
773 | ||
774 | for (i = 0; i < cookie->nr_fids; i++) { | |
775 | struct inode *ti; | |
776 | ||
777 | if (cookie->statuses[i].abort_code != 0) | |
778 | continue; | |
779 | ||
780 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
781 | &cookie->statuses[i], | |
782 | &cookie->callbacks[i], | |
783 | cbi); | |
784 | if (i == 0) { | |
785 | inode = ti; | |
786 | } else { | |
787 | if (!IS_ERR(ti)) | |
788 | iput(ti); | |
789 | } | |
790 | } | |
791 | ||
792 | out_c: | |
793 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
794 | kfree(cookie->callbacks); | |
795 | out_s: | |
796 | kfree(cookie->statuses); | |
797 | out: | |
798 | kfree(cookie); | |
799 | return inode; | |
800 | } | |
801 | ||
6f8880d8 DH |
802 | /* |
803 | * Look up an entry in a directory with @sys substitution. | |
804 | */ | |
805 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
806 | struct key *key) | |
807 | { | |
808 | struct afs_sysnames *subs; | |
809 | struct afs_net *net = afs_i2net(dir); | |
810 | struct dentry *ret; | |
811 | char *buf, *p, *name; | |
812 | int len, i; | |
813 | ||
814 | _enter(""); | |
815 | ||
816 | ret = ERR_PTR(-ENOMEM); | |
817 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
818 | if (!buf) | |
819 | goto out_p; | |
820 | if (dentry->d_name.len > 4) { | |
821 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
822 | p += dentry->d_name.len - 4; | |
823 | } | |
824 | ||
825 | /* There is an ordered list of substitutes that we have to try. */ | |
826 | read_lock(&net->sysnames_lock); | |
827 | subs = net->sysnames; | |
828 | refcount_inc(&subs->usage); | |
829 | read_unlock(&net->sysnames_lock); | |
830 | ||
831 | for (i = 0; i < subs->nr; i++) { | |
832 | name = subs->subs[i]; | |
833 | len = dentry->d_name.len - 4 + strlen(name); | |
834 | if (len >= AFSNAMEMAX) { | |
835 | ret = ERR_PTR(-ENAMETOOLONG); | |
836 | goto out_s; | |
837 | } | |
838 | ||
839 | strcpy(p, name); | |
840 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
841 | if (IS_ERR(ret) || d_is_positive(ret)) | |
842 | goto out_s; | |
843 | dput(ret); | |
844 | } | |
845 | ||
846 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
847 | * the cached dentry to hide changes to the sysnames list. | |
848 | */ | |
849 | ret = NULL; | |
850 | out_s: | |
851 | afs_put_sysnames(subs); | |
852 | kfree(buf); | |
853 | out_p: | |
854 | key_put(key); | |
855 | return ret; | |
856 | } | |
857 | ||
08e0e7c8 DH |
858 | /* |
859 | * look up an entry in a directory | |
860 | */ | |
260a9803 | 861 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 862 | unsigned int flags) |
08e0e7c8 | 863 | { |
5cf9dd55 | 864 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 865 | struct inode *inode; |
00d3b7a4 | 866 | struct key *key; |
08e0e7c8 DH |
867 | int ret; |
868 | ||
a455589f | 869 | _enter("{%x:%u},%p{%pd},", |
5cf9dd55 | 870 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 871 | |
2b0143b5 | 872 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 873 | |
45222b9e | 874 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
875 | _leave(" = -ENAMETOOLONG"); |
876 | return ERR_PTR(-ENAMETOOLONG); | |
877 | } | |
878 | ||
5cf9dd55 | 879 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
880 | _leave(" = -ESTALE"); |
881 | return ERR_PTR(-ESTALE); | |
882 | } | |
883 | ||
5cf9dd55 | 884 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
885 | if (IS_ERR(key)) { |
886 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 887 | return ERR_CAST(key); |
00d3b7a4 DH |
888 | } |
889 | ||
5cf9dd55 | 890 | ret = afs_validate(dvnode, key); |
260a9803 DH |
891 | if (ret < 0) { |
892 | key_put(key); | |
893 | _leave(" = %d [val]", ret); | |
894 | return ERR_PTR(ret); | |
895 | } | |
896 | ||
6f8880d8 DH |
897 | if (dentry->d_name.len >= 4 && |
898 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
899 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
900 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
901 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
902 | return afs_lookup_atsys(dir, dentry, key); | |
903 | ||
d55b4da4 | 904 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 DH |
905 | inode = afs_do_lookup(dir, dentry, key); |
906 | if (IS_ERR(inode)) { | |
907 | ret = PTR_ERR(inode); | |
4d673da1 | 908 | if (ret == -ENOENT) { |
5cf9dd55 | 909 | inode = afs_try_auto_mntpt(dentry, dir); |
4d673da1 DH |
910 | if (!IS_ERR(inode)) { |
911 | key_put(key); | |
912 | goto success; | |
913 | } | |
914 | ||
915 | ret = PTR_ERR(inode); | |
bec5eb61 | 916 | } |
917 | ||
00d3b7a4 | 918 | key_put(key); |
260a9803 DH |
919 | if (ret == -ENOENT) { |
920 | d_add(dentry, NULL); | |
921 | _leave(" = NULL [negative]"); | |
922 | return NULL; | |
923 | } | |
08e0e7c8 | 924 | _leave(" = %d [do]", ret); |
1da177e4 LT |
925 | return ERR_PTR(ret); |
926 | } | |
5cf9dd55 | 927 | dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; |
1da177e4 | 928 | |
08e0e7c8 | 929 | /* instantiate the dentry */ |
00d3b7a4 | 930 | key_put(key); |
08e0e7c8 DH |
931 | if (IS_ERR(inode)) { |
932 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 933 | return ERR_CAST(inode); |
08e0e7c8 DH |
934 | } |
935 | ||
bec5eb61 | 936 | success: |
1da177e4 | 937 | d_add(dentry, inode); |
5cf9dd55 | 938 | _leave(" = 0 { ino=%lu v=%u }", |
2b0143b5 DH |
939 | d_inode(dentry)->i_ino, |
940 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
941 | |
942 | return NULL; | |
ec26815a | 943 | } |
1da177e4 | 944 | |
1da177e4 LT |
945 | /* |
946 | * check that a dentry lookup hit has found a valid entry | |
947 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
948 | * inode | |
1da177e4 | 949 | */ |
0b728e19 | 950 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 951 | { |
260a9803 | 952 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 953 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 954 | struct dentry *parent; |
c435ee34 | 955 | struct inode *inode; |
00d3b7a4 | 956 | struct key *key; |
a4ff7401 | 957 | long dir_version, de_version; |
1da177e4 LT |
958 | int ret; |
959 | ||
0b728e19 | 960 | if (flags & LOOKUP_RCU) |
34286d66 NP |
961 | return -ECHILD; |
962 | ||
c435ee34 DH |
963 | if (d_really_is_positive(dentry)) { |
964 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
965 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
966 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 967 | vnode->flags); |
c435ee34 | 968 | } else { |
a455589f | 969 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 970 | } |
1da177e4 | 971 | |
260a9803 | 972 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
973 | if (IS_ERR(key)) |
974 | key = NULL; | |
975 | ||
c435ee34 DH |
976 | if (d_really_is_positive(dentry)) { |
977 | inode = d_inode(dentry); | |
978 | if (inode) { | |
979 | vnode = AFS_FS_I(inode); | |
980 | afs_validate(vnode, key); | |
981 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
982 | goto out_bad; | |
983 | } | |
984 | } | |
985 | ||
1da177e4 | 986 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 987 | parent = dget_parent(dentry); |
2b0143b5 | 988 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 989 | |
260a9803 | 990 | /* validate the parent directory */ |
c435ee34 | 991 | afs_validate(dir, key); |
260a9803 DH |
992 | |
993 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 994 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 995 | goto out_bad_parent; |
1da177e4 LT |
996 | } |
997 | ||
a4ff7401 DH |
998 | /* We only need to invalidate a dentry if the server's copy changed |
999 | * behind our back. If we made the change, it's no problem. Note that | |
1000 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1001 | * version. | |
1002 | */ | |
1003 | dir_version = (long)dir->status.data_version; | |
1004 | de_version = (long)dentry->d_fsdata; | |
1005 | if (de_version == dir_version) | |
1006 | goto out_valid; | |
1007 | ||
1008 | dir_version = (long)dir->invalid_before; | |
1009 | if (de_version - dir_version >= 0) | |
1010 | goto out_valid; | |
1da177e4 | 1011 | |
260a9803 | 1012 | _debug("dir modified"); |
d55b4da4 | 1013 | afs_stat_v(dir, n_reval); |
260a9803 DH |
1014 | |
1015 | /* search the directory for this vnode */ | |
5cf9dd55 | 1016 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
1017 | switch (ret) { |
1018 | case 0: | |
1019 | /* the filename maps to something */ | |
2b0143b5 | 1020 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
1021 | goto out_bad_parent; |
1022 | inode = d_inode(dentry); | |
1023 | if (is_bad_inode(inode)) { | |
a455589f AV |
1024 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
1025 | dentry); | |
c435ee34 | 1026 | goto out_bad_parent; |
1da177e4 LT |
1027 | } |
1028 | ||
c435ee34 DH |
1029 | vnode = AFS_FS_I(inode); |
1030 | ||
1da177e4 LT |
1031 | /* if the vnode ID has changed, then the dirent points to a |
1032 | * different file */ | |
08e0e7c8 | 1033 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
1034 | _debug("%pd: dirent changed [%u != %u]", |
1035 | dentry, fid.vnode, | |
08e0e7c8 | 1036 | vnode->fid.vnode); |
1da177e4 LT |
1037 | goto not_found; |
1038 | } | |
1039 | ||
1040 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1041 | * been deleted and replaced, and the original vnode ID has |
1042 | * been reused */ | |
08e0e7c8 | 1043 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1044 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1045 | dentry, fid.unique, | |
7a224228 | 1046 | vnode->fid.unique, |
c435ee34 DH |
1047 | vnode->vfs_inode.i_generation); |
1048 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1049 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1050 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1051 | goto not_found; |
1da177e4 | 1052 | } |
260a9803 | 1053 | goto out_valid; |
08e0e7c8 | 1054 | |
260a9803 DH |
1055 | case -ENOENT: |
1056 | /* the filename is unknown */ | |
a455589f | 1057 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1058 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1059 | goto not_found; |
1060 | goto out_valid; | |
1da177e4 | 1061 | |
260a9803 | 1062 | default: |
a455589f AV |
1063 | _debug("failed to iterate dir %pd: %d", |
1064 | parent, ret); | |
c435ee34 | 1065 | goto out_bad_parent; |
08e0e7c8 DH |
1066 | } |
1067 | ||
ec26815a | 1068 | out_valid: |
a4ff7401 | 1069 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1070 | dput(parent); |
00d3b7a4 | 1071 | key_put(key); |
1da177e4 LT |
1072 | _leave(" = 1 [valid]"); |
1073 | return 1; | |
1074 | ||
1075 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1076 | not_found: |
1da177e4 LT |
1077 | spin_lock(&dentry->d_lock); |
1078 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1079 | spin_unlock(&dentry->d_lock); | |
1080 | ||
c435ee34 | 1081 | out_bad_parent: |
a455589f | 1082 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1083 | dput(parent); |
c435ee34 | 1084 | out_bad: |
00d3b7a4 | 1085 | key_put(key); |
1da177e4 LT |
1086 | |
1087 | _leave(" = 0 [bad]"); | |
1088 | return 0; | |
ec26815a | 1089 | } |
1da177e4 | 1090 | |
1da177e4 LT |
1091 | /* |
1092 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1093 | * sleep) | |
1094 | * - called from dput() when d_count is going to 0. | |
1095 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1096 | */ | |
fe15ce44 | 1097 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1098 | { |
a455589f | 1099 | _enter("%pd", dentry); |
1da177e4 LT |
1100 | |
1101 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1102 | goto zap; | |
1103 | ||
2b0143b5 DH |
1104 | if (d_really_is_positive(dentry) && |
1105 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1106 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1107 | goto zap; |
1da177e4 LT |
1108 | |
1109 | _leave(" = 0 [keep]"); | |
1110 | return 0; | |
1111 | ||
ec26815a | 1112 | zap: |
1da177e4 LT |
1113 | _leave(" = 1 [zap]"); |
1114 | return 1; | |
ec26815a | 1115 | } |
260a9803 DH |
1116 | |
1117 | /* | |
1118 | * handle dentry release | |
1119 | */ | |
66c7e1d3 | 1120 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1121 | { |
a455589f | 1122 | _enter("%pd", dentry); |
260a9803 DH |
1123 | } |
1124 | ||
d2ddc776 DH |
1125 | /* |
1126 | * Create a new inode for create/mkdir/symlink | |
1127 | */ | |
1128 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1129 | struct dentry *new_dentry, | |
1130 | struct afs_fid *newfid, | |
1131 | struct afs_file_status *newstatus, | |
1132 | struct afs_callback *newcb) | |
1133 | { | |
1134 | struct inode *inode; | |
1135 | ||
1136 | if (fc->ac.error < 0) | |
1137 | return; | |
1138 | ||
bc1527dc DH |
1139 | d_drop(new_dentry); |
1140 | ||
d2ddc776 DH |
1141 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
1142 | newfid, newstatus, newcb, fc->cbi); | |
1143 | if (IS_ERR(inode)) { | |
1144 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1145 | * the new directory on the server. | |
1146 | */ | |
1147 | fc->ac.error = PTR_ERR(inode); | |
1148 | return; | |
1149 | } | |
1150 | ||
bc1527dc | 1151 | d_add(new_dentry, inode); |
d2ddc776 DH |
1152 | } |
1153 | ||
260a9803 DH |
1154 | /* |
1155 | * create a directory on an AFS filesystem | |
1156 | */ | |
18bb1db3 | 1157 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1158 | { |
d2ddc776 DH |
1159 | struct afs_file_status newstatus; |
1160 | struct afs_fs_cursor fc; | |
1161 | struct afs_callback newcb; | |
1162 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1163 | struct afs_fid newfid; | |
260a9803 DH |
1164 | struct key *key; |
1165 | int ret; | |
1166 | ||
d2ddc776 | 1167 | mode |= S_IFDIR; |
260a9803 | 1168 | |
a455589f AV |
1169 | _enter("{%x:%u},{%pd},%ho", |
1170 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1171 | |
260a9803 DH |
1172 | key = afs_request_key(dvnode->volume->cell); |
1173 | if (IS_ERR(key)) { | |
1174 | ret = PTR_ERR(key); | |
1175 | goto error; | |
1176 | } | |
1177 | ||
d2ddc776 DH |
1178 | ret = -ERESTARTSYS; |
1179 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1180 | while (afs_select_fileserver(&fc)) { | |
1181 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1182 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1183 | &newfid, &newstatus, &newcb); | |
1184 | } | |
260a9803 | 1185 | |
d2ddc776 DH |
1186 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1187 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1188 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1189 | ret = afs_end_vnode_operation(&fc); | |
1190 | if (ret < 0) | |
1191 | goto error_key; | |
4433b691 DH |
1192 | } else { |
1193 | goto error_key; | |
260a9803 DH |
1194 | } |
1195 | ||
260a9803 DH |
1196 | key_put(key); |
1197 | _leave(" = 0"); | |
1198 | return 0; | |
1199 | ||
d2ddc776 | 1200 | error_key: |
260a9803 DH |
1201 | key_put(key); |
1202 | error: | |
1203 | d_drop(dentry); | |
1204 | _leave(" = %d", ret); | |
1205 | return ret; | |
1206 | } | |
1207 | ||
d2ddc776 DH |
1208 | /* |
1209 | * Remove a subdir from a directory. | |
1210 | */ | |
1211 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1212 | { | |
1213 | if (d_really_is_positive(dentry)) { | |
1214 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1215 | ||
1216 | clear_nlink(&vnode->vfs_inode); | |
1217 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1218 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1219 | } | |
1220 | } | |
1221 | ||
260a9803 DH |
1222 | /* |
1223 | * remove a directory from an AFS filesystem | |
1224 | */ | |
1225 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1226 | { | |
d2ddc776 DH |
1227 | struct afs_fs_cursor fc; |
1228 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 DH |
1229 | struct key *key; |
1230 | int ret; | |
1231 | ||
a455589f AV |
1232 | _enter("{%x:%u},{%pd}", |
1233 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1234 | |
260a9803 DH |
1235 | key = afs_request_key(dvnode->volume->cell); |
1236 | if (IS_ERR(key)) { | |
1237 | ret = PTR_ERR(key); | |
1238 | goto error; | |
1239 | } | |
1240 | ||
d2ddc776 DH |
1241 | ret = -ERESTARTSYS; |
1242 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1243 | while (afs_select_fileserver(&fc)) { | |
1244 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1245 | afs_fs_remove(&fc, dentry->d_name.name, true); | |
1246 | } | |
260a9803 | 1247 | |
d2ddc776 DH |
1248 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1249 | ret = afs_end_vnode_operation(&fc); | |
1250 | if (ret == 0) | |
1251 | afs_dir_remove_subdir(dentry); | |
260a9803 DH |
1252 | } |
1253 | ||
1254 | key_put(key); | |
260a9803 | 1255 | error: |
260a9803 DH |
1256 | return ret; |
1257 | } | |
1258 | ||
1259 | /* | |
d2ddc776 DH |
1260 | * Remove a link to a file or symlink from a directory. |
1261 | * | |
1262 | * If the file was not deleted due to excess hard links, the fileserver will | |
1263 | * break the callback promise on the file - if it had one - before it returns | |
1264 | * to us, and if it was deleted, it won't | |
1265 | * | |
1266 | * However, if we didn't have a callback promise outstanding, or it was | |
1267 | * outstanding on a different server, then it won't break it either... | |
1268 | */ | |
440fbc3a DH |
1269 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1270 | unsigned long d_version_before, | |
1271 | unsigned long d_version_after) | |
d2ddc776 | 1272 | { |
440fbc3a | 1273 | bool dir_valid; |
d2ddc776 DH |
1274 | int ret = 0; |
1275 | ||
440fbc3a DH |
1276 | /* There were no intervening changes on the server if the version |
1277 | * number we got back was incremented by exactly 1. | |
1278 | */ | |
1279 | dir_valid = (d_version_after == d_version_before + 1); | |
1280 | ||
d2ddc776 DH |
1281 | if (d_really_is_positive(dentry)) { |
1282 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1283 | ||
440fbc3a DH |
1284 | if (dir_valid) { |
1285 | drop_nlink(&vnode->vfs_inode); | |
1286 | if (vnode->vfs_inode.i_nlink == 0) { | |
1287 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1288 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1289 | } | |
d2ddc776 | 1290 | ret = 0; |
440fbc3a DH |
1291 | } else { |
1292 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1293 | ||
1294 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1295 | kdebug("AFS_VNODE_DELETED"); | |
1296 | ||
1297 | ret = afs_validate(vnode, key); | |
1298 | if (ret == -ESTALE) | |
1299 | ret = 0; | |
1300 | } | |
d2ddc776 DH |
1301 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1302 | } | |
1303 | ||
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1309 | */ |
1310 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1311 | { | |
d2ddc776 DH |
1312 | struct afs_fs_cursor fc; |
1313 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 | 1314 | struct key *key; |
440fbc3a | 1315 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
260a9803 DH |
1316 | int ret; |
1317 | ||
a455589f AV |
1318 | _enter("{%x:%u},{%pd}", |
1319 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1320 | |
45222b9e | 1321 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1322 | return -ENAMETOOLONG; |
260a9803 DH |
1323 | |
1324 | key = afs_request_key(dvnode->volume->cell); | |
1325 | if (IS_ERR(key)) { | |
1326 | ret = PTR_ERR(key); | |
1327 | goto error; | |
1328 | } | |
1329 | ||
d2ddc776 | 1330 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1331 | if (d_really_is_positive(dentry)) { |
1332 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1333 | ret = afs_validate(vnode, key); |
1334 | if (ret < 0) | |
d2ddc776 | 1335 | goto error_key; |
260a9803 DH |
1336 | } |
1337 | ||
d2ddc776 DH |
1338 | ret = -ERESTARTSYS; |
1339 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1340 | while (afs_select_fileserver(&fc)) { | |
1341 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1342 | afs_fs_remove(&fc, dentry->d_name.name, false); | |
1343 | } | |
260a9803 | 1344 | |
d2ddc776 DH |
1345 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1346 | ret = afs_end_vnode_operation(&fc); | |
1347 | if (ret == 0) | |
440fbc3a DH |
1348 | ret = afs_dir_remove_link( |
1349 | dentry, key, d_version, | |
1350 | (unsigned long)dvnode->status.data_version); | |
260a9803 DH |
1351 | } |
1352 | ||
d2ddc776 | 1353 | error_key: |
260a9803 DH |
1354 | key_put(key); |
1355 | error: | |
1356 | _leave(" = %d", ret); | |
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * create a regular file on an AFS filesystem | |
1362 | */ | |
4acdaf27 | 1363 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1364 | bool excl) |
260a9803 | 1365 | { |
d2ddc776 DH |
1366 | struct afs_fs_cursor fc; |
1367 | struct afs_file_status newstatus; | |
1368 | struct afs_callback newcb; | |
43dd388b | 1369 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1370 | struct afs_fid newfid; |
260a9803 DH |
1371 | struct key *key; |
1372 | int ret; | |
1373 | ||
d2ddc776 | 1374 | mode |= S_IFREG; |
260a9803 | 1375 | |
a455589f AV |
1376 | _enter("{%x:%u},{%pd},%ho,", |
1377 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1378 | |
d2ddc776 DH |
1379 | ret = -ENAMETOOLONG; |
1380 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1381 | goto error; | |
1382 | ||
260a9803 DH |
1383 | key = afs_request_key(dvnode->volume->cell); |
1384 | if (IS_ERR(key)) { | |
1385 | ret = PTR_ERR(key); | |
1386 | goto error; | |
1387 | } | |
1388 | ||
d2ddc776 DH |
1389 | ret = -ERESTARTSYS; |
1390 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1391 | while (afs_select_fileserver(&fc)) { | |
1392 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1393 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1394 | &newfid, &newstatus, &newcb); | |
1395 | } | |
260a9803 | 1396 | |
d2ddc776 DH |
1397 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1398 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1399 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1400 | ret = afs_end_vnode_operation(&fc); | |
1401 | if (ret < 0) | |
1402 | goto error_key; | |
4433b691 DH |
1403 | } else { |
1404 | goto error_key; | |
260a9803 DH |
1405 | } |
1406 | ||
260a9803 DH |
1407 | key_put(key); |
1408 | _leave(" = 0"); | |
1409 | return 0; | |
1410 | ||
d2ddc776 | 1411 | error_key: |
260a9803 DH |
1412 | key_put(key); |
1413 | error: | |
1414 | d_drop(dentry); | |
1415 | _leave(" = %d", ret); | |
1416 | return ret; | |
1417 | } | |
1418 | ||
1419 | /* | |
1420 | * create a hard link between files in an AFS filesystem | |
1421 | */ | |
1422 | static int afs_link(struct dentry *from, struct inode *dir, | |
1423 | struct dentry *dentry) | |
1424 | { | |
d2ddc776 | 1425 | struct afs_fs_cursor fc; |
260a9803 DH |
1426 | struct afs_vnode *dvnode, *vnode; |
1427 | struct key *key; | |
1428 | int ret; | |
1429 | ||
2b0143b5 | 1430 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 DH |
1431 | dvnode = AFS_FS_I(dir); |
1432 | ||
a455589f | 1433 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1434 | vnode->fid.vid, vnode->fid.vnode, |
1435 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1436 | dentry); |
260a9803 | 1437 | |
d2ddc776 DH |
1438 | ret = -ENAMETOOLONG; |
1439 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1440 | goto error; | |
1441 | ||
260a9803 DH |
1442 | key = afs_request_key(dvnode->volume->cell); |
1443 | if (IS_ERR(key)) { | |
1444 | ret = PTR_ERR(key); | |
1445 | goto error; | |
1446 | } | |
1447 | ||
d2ddc776 DH |
1448 | ret = -ERESTARTSYS; |
1449 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1450 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1451 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1452 | goto error_key; |
d2ddc776 DH |
1453 | } |
1454 | ||
1455 | while (afs_select_fileserver(&fc)) { | |
1456 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1457 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
1458 | afs_fs_link(&fc, vnode, dentry->d_name.name); | |
1459 | } | |
1460 | ||
1461 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1462 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1463 | ihold(&vnode->vfs_inode); | |
1464 | d_instantiate(dentry, &vnode->vfs_inode); | |
1465 | ||
1466 | mutex_unlock(&vnode->io_lock); | |
1467 | ret = afs_end_vnode_operation(&fc); | |
1468 | if (ret < 0) | |
1469 | goto error_key; | |
4433b691 DH |
1470 | } else { |
1471 | goto error_key; | |
d2ddc776 | 1472 | } |
260a9803 | 1473 | |
260a9803 DH |
1474 | key_put(key); |
1475 | _leave(" = 0"); | |
1476 | return 0; | |
1477 | ||
d2ddc776 | 1478 | error_key: |
260a9803 DH |
1479 | key_put(key); |
1480 | error: | |
1481 | d_drop(dentry); | |
1482 | _leave(" = %d", ret); | |
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * create a symlink in an AFS filesystem | |
1488 | */ | |
1489 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1490 | const char *content) | |
1491 | { | |
d2ddc776 DH |
1492 | struct afs_fs_cursor fc; |
1493 | struct afs_file_status newstatus; | |
1494 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1495 | struct afs_fid newfid; | |
260a9803 DH |
1496 | struct key *key; |
1497 | int ret; | |
1498 | ||
a455589f AV |
1499 | _enter("{%x:%u},{%pd},%s", |
1500 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1501 | content); |
1502 | ||
d2ddc776 DH |
1503 | ret = -ENAMETOOLONG; |
1504 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1505 | goto error; | |
1506 | ||
260a9803 | 1507 | ret = -EINVAL; |
45222b9e | 1508 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1509 | goto error; |
1510 | ||
1511 | key = afs_request_key(dvnode->volume->cell); | |
1512 | if (IS_ERR(key)) { | |
1513 | ret = PTR_ERR(key); | |
1514 | goto error; | |
1515 | } | |
1516 | ||
d2ddc776 DH |
1517 | ret = -ERESTARTSYS; |
1518 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1519 | while (afs_select_fileserver(&fc)) { | |
1520 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1521 | afs_fs_symlink(&fc, dentry->d_name.name, content, | |
1522 | &newfid, &newstatus); | |
1523 | } | |
260a9803 | 1524 | |
d2ddc776 DH |
1525 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1526 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1527 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1528 | ret = afs_end_vnode_operation(&fc); | |
1529 | if (ret < 0) | |
1530 | goto error_key; | |
4433b691 DH |
1531 | } else { |
1532 | goto error_key; | |
260a9803 DH |
1533 | } |
1534 | ||
260a9803 DH |
1535 | key_put(key); |
1536 | _leave(" = 0"); | |
1537 | return 0; | |
1538 | ||
d2ddc776 | 1539 | error_key: |
260a9803 DH |
1540 | key_put(key); |
1541 | error: | |
1542 | d_drop(dentry); | |
1543 | _leave(" = %d", ret); | |
1544 | return ret; | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * rename a file in an AFS filesystem and/or move it between directories | |
1549 | */ | |
1550 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1551 | struct inode *new_dir, struct dentry *new_dentry, |
1552 | unsigned int flags) | |
260a9803 | 1553 | { |
d2ddc776 | 1554 | struct afs_fs_cursor fc; |
260a9803 DH |
1555 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1556 | struct key *key; | |
1557 | int ret; | |
1558 | ||
1cd66c93 MS |
1559 | if (flags) |
1560 | return -EINVAL; | |
1561 | ||
2b0143b5 | 1562 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1563 | orig_dvnode = AFS_FS_I(old_dir); |
1564 | new_dvnode = AFS_FS_I(new_dir); | |
1565 | ||
a455589f | 1566 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1567 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1568 | vnode->fid.vid, vnode->fid.vnode, | |
1569 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1570 | new_dentry); |
260a9803 | 1571 | |
260a9803 DH |
1572 | key = afs_request_key(orig_dvnode->volume->cell); |
1573 | if (IS_ERR(key)) { | |
1574 | ret = PTR_ERR(key); | |
1575 | goto error; | |
1576 | } | |
1577 | ||
d2ddc776 DH |
1578 | ret = -ERESTARTSYS; |
1579 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1580 | if (orig_dvnode != new_dvnode) { | |
1581 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1582 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1583 | goto error_key; |
d2ddc776 DH |
1584 | } |
1585 | } | |
1586 | while (afs_select_fileserver(&fc)) { | |
1587 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1588 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1589 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
1590 | new_dvnode, new_dentry->d_name.name); | |
1591 | } | |
1592 | ||
1593 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1594 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1595 | if (orig_dvnode != new_dvnode) | |
1596 | mutex_unlock(&new_dvnode->io_lock); | |
1597 | ret = afs_end_vnode_operation(&fc); | |
1598 | if (ret < 0) | |
1599 | goto error_key; | |
1600 | } | |
1601 | ||
d2ddc776 | 1602 | error_key: |
260a9803 DH |
1603 | key_put(key); |
1604 | error: | |
260a9803 DH |
1605 | _leave(" = %d", ret); |
1606 | return ret; | |
1607 | } | |
f3ddee8d DH |
1608 | |
1609 | /* | |
1610 | * Release a directory page and clean up its private state if it's not busy | |
1611 | * - return true if the page can now be released, false if not | |
1612 | */ | |
1613 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1614 | { | |
1615 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1616 | ||
1617 | _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); | |
1618 | ||
1619 | set_page_private(page, 0); | |
1620 | ClearPagePrivate(page); | |
1621 | ||
1622 | /* The directory will need reloading. */ | |
1623 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1624 | afs_stat_v(dvnode, n_relpg); | |
1625 | return 1; | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * invalidate part or all of a page | |
1630 | * - release a page and clean up its private data if offset is 0 (indicating | |
1631 | * the entire page) | |
1632 | */ | |
1633 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1634 | unsigned int length) | |
1635 | { | |
1636 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1637 | ||
1638 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1639 | ||
1640 | BUG_ON(!PageLocked(page)); | |
1641 | ||
1642 | /* The directory will need reloading. */ | |
1643 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1644 | afs_stat_v(dvnode, n_inval); | |
1645 | ||
1646 | /* we clean up only if the entire page is being invalidated */ | |
1647 | if (offset == 0 && length == PAGE_SIZE) { | |
1648 | set_page_private(page, 0); | |
1649 | ClearPagePrivate(page); | |
1650 | } | |
1651 | } |