]>
Commit | Line | Data |
---|---|---|
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 | 20 | #include "internal.h" |
4ea219a8 | 21 | #include "xdr_fs.h" |
1da177e4 | 22 | |
260a9803 | 23 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 24 | unsigned int flags); |
1da177e4 | 25 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 26 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 27 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 28 | static int afs_d_delete(const struct dentry *dentry); |
5cf9dd55 | 29 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 30 | loff_t fpos, u64 ino, unsigned dtype); |
5cf9dd55 DH |
31 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
32 | loff_t fpos, u64 ino, unsigned dtype); | |
4acdaf27 | 33 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 34 | bool excl); |
18bb1db3 | 35 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
36 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
37 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
38 | static int afs_link(struct dentry *from, struct inode *dir, | |
39 | struct dentry *dentry); | |
40 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
41 | const char *content); | |
42 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
43 | struct inode *new_dir, struct dentry *new_dentry, |
44 | unsigned int flags); | |
f3ddee8d DH |
45 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
46 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
47 | unsigned int length); | |
48 | ||
49 | static int afs_dir_set_page_dirty(struct page *page) | |
50 | { | |
51 | BUG(); /* This should never happen. */ | |
52 | } | |
1da177e4 | 53 | |
4b6f5d20 | 54 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 55 | .open = afs_dir_open, |
00d3b7a4 | 56 | .release = afs_release, |
29884eff | 57 | .iterate_shared = afs_readdir, |
e8d6c554 | 58 | .lock = afs_lock, |
3222a3e5 | 59 | .llseek = generic_file_llseek, |
1da177e4 LT |
60 | }; |
61 | ||
754661f1 | 62 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
63 | .create = afs_create, |
64 | .lookup = afs_lookup, | |
65 | .link = afs_link, | |
66 | .unlink = afs_unlink, | |
67 | .symlink = afs_symlink, | |
68 | .mkdir = afs_mkdir, | |
69 | .rmdir = afs_rmdir, | |
2773bf00 | 70 | .rename = afs_rename, |
00d3b7a4 | 71 | .permission = afs_permission, |
416351f2 | 72 | .getattr = afs_getattr, |
31143d5d | 73 | .setattr = afs_setattr, |
d3e3b7ea | 74 | .listxattr = afs_listxattr, |
1da177e4 LT |
75 | }; |
76 | ||
f3ddee8d DH |
77 | const struct address_space_operations afs_dir_aops = { |
78 | .set_page_dirty = afs_dir_set_page_dirty, | |
79 | .releasepage = afs_dir_releasepage, | |
80 | .invalidatepage = afs_dir_invalidatepage, | |
81 | }; | |
82 | ||
d61dcce2 | 83 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
84 | .d_revalidate = afs_d_revalidate, |
85 | .d_delete = afs_d_delete, | |
260a9803 | 86 | .d_release = afs_d_release, |
d18610b0 | 87 | .d_automount = afs_d_automount, |
1da177e4 LT |
88 | }; |
89 | ||
5cf9dd55 DH |
90 | struct afs_lookup_one_cookie { |
91 | struct dir_context ctx; | |
92 | struct qstr name; | |
93 | bool found; | |
94 | struct afs_fid fid; | |
95 | }; | |
96 | ||
260a9803 | 97 | struct afs_lookup_cookie { |
5cf9dd55 DH |
98 | struct dir_context ctx; |
99 | struct qstr name; | |
100 | bool found; | |
101 | bool one_only; | |
102 | unsigned short nr_fids; | |
103 | struct afs_file_status *statuses; | |
104 | struct afs_callback *callbacks; | |
105 | struct afs_fid fids[50]; | |
1da177e4 LT |
106 | }; |
107 | ||
1da177e4 LT |
108 | /* |
109 | * check that a directory page is valid | |
110 | */ | |
f3ddee8d DH |
111 | static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
112 | loff_t i_size) | |
1da177e4 | 113 | { |
00317636 | 114 | struct afs_xdr_dir_page *dbuf; |
f3ddee8d | 115 | loff_t latter, off; |
1da177e4 LT |
116 | int tmp, qty; |
117 | ||
dab17c1a DH |
118 | /* Determine how many magic numbers there should be in this page, but |
119 | * we must take care because the directory may change size under us. | |
120 | */ | |
121 | off = page_offset(page); | |
dab17c1a DH |
122 | if (i_size <= off) |
123 | goto checked; | |
124 | ||
125 | latter = i_size - off; | |
1da177e4 LT |
126 | if (latter >= PAGE_SIZE) |
127 | qty = PAGE_SIZE; | |
128 | else | |
129 | qty = latter; | |
00317636 | 130 | qty /= sizeof(union afs_xdr_dir_block); |
1da177e4 LT |
131 | |
132 | /* check them */ | |
63a4681f | 133 | dbuf = kmap(page); |
1da177e4 | 134 | for (tmp = 0; tmp < qty; tmp++) { |
00317636 | 135 | if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { |
dab17c1a | 136 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
f3ddee8d | 137 | __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
00317636 | 138 | ntohs(dbuf->blocks[tmp].hdr.magic)); |
f3ddee8d | 139 | trace_afs_dir_check_failed(dvnode, off, i_size); |
63a4681f | 140 | kunmap(page); |
1da177e4 LT |
141 | goto error; |
142 | } | |
63a4681f DH |
143 | |
144 | /* Make sure each block is NUL terminated so we can reasonably | |
145 | * use string functions on it. The filenames in the page | |
146 | * *should* be NUL-terminated anyway. | |
147 | */ | |
148 | ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; | |
1da177e4 LT |
149 | } |
150 | ||
63a4681f DH |
151 | kunmap(page); |
152 | ||
dab17c1a | 153 | checked: |
f3ddee8d | 154 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 155 | return true; |
1da177e4 | 156 | |
ec26815a | 157 | error: |
be5b82db | 158 | return false; |
ec26815a | 159 | } |
1da177e4 | 160 | |
1da177e4 LT |
161 | /* |
162 | * open an AFS directory file | |
163 | */ | |
164 | static int afs_dir_open(struct inode *inode, struct file *file) | |
165 | { | |
166 | _enter("{%lu}", inode->i_ino); | |
167 | ||
00317636 DH |
168 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
169 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 170 | |
08e0e7c8 | 171 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
172 | return -ENOENT; |
173 | ||
00d3b7a4 | 174 | return afs_open(inode, file); |
ec26815a | 175 | } |
1da177e4 | 176 | |
f3ddee8d DH |
177 | /* |
178 | * Read the directory into the pagecache in one go, scrubbing the previous | |
179 | * contents. The list of pages is returned, pinning them so that they don't | |
180 | * get reclaimed during the iteration. | |
181 | */ | |
182 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 183 | __acquires(&dvnode->validate_lock) |
f3ddee8d DH |
184 | { |
185 | struct afs_read *req; | |
186 | loff_t i_size; | |
187 | int nr_pages, nr_inline, i, n; | |
188 | int ret = -ENOMEM; | |
189 | ||
190 | retry: | |
191 | i_size = i_size_read(&dvnode->vfs_inode); | |
192 | if (i_size < 2048) | |
193 | return ERR_PTR(-EIO); | |
194 | if (i_size > 2048 * 1024) | |
195 | return ERR_PTR(-EFBIG); | |
196 | ||
197 | _enter("%llu", i_size); | |
198 | ||
199 | /* Get a request record to hold the page list. We want to hold it | |
200 | * inline if we can, but we don't want to make an order 1 allocation. | |
201 | */ | |
202 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
203 | nr_inline = nr_pages; | |
204 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
205 | nr_inline = 0; | |
206 | ||
207 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
208 | GFP_KERNEL); | |
209 | if (!req) | |
210 | return ERR_PTR(-ENOMEM); | |
211 | ||
212 | refcount_set(&req->usage, 1); | |
213 | req->nr_pages = nr_pages; | |
214 | req->actual_len = i_size; /* May change */ | |
215 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
216 | req->data_version = dvnode->status.data_version; /* May change */ | |
217 | if (nr_inline > 0) { | |
218 | req->pages = req->array; | |
219 | } else { | |
220 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
221 | GFP_KERNEL); | |
222 | if (!req->pages) | |
223 | goto error; | |
224 | } | |
225 | ||
226 | /* Get a list of all the pages that hold or will hold the directory | |
227 | * content. We need to fill in any gaps that we might find where the | |
228 | * memory reclaimer has been at work. If there are any gaps, we will | |
229 | * need to reread the entire directory contents. | |
230 | */ | |
231 | i = 0; | |
232 | do { | |
233 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
234 | req->nr_pages - i, | |
235 | req->pages + i); | |
236 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
237 | if (n == 0) { | |
238 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
239 | ||
240 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
241 | afs_stat_v(dvnode, n_inval); | |
242 | ||
243 | ret = -ENOMEM; | |
244 | req->pages[i] = __page_cache_alloc(gfp); | |
245 | if (!req->pages[i]) | |
246 | goto error; | |
247 | ret = add_to_page_cache_lru(req->pages[i], | |
248 | dvnode->vfs_inode.i_mapping, | |
249 | i, gfp); | |
250 | if (ret < 0) | |
251 | goto error; | |
252 | ||
253 | set_page_private(req->pages[i], 1); | |
254 | SetPagePrivate(req->pages[i]); | |
255 | unlock_page(req->pages[i]); | |
256 | i++; | |
257 | } else { | |
258 | i += n; | |
259 | } | |
260 | } while (i < req->nr_pages); | |
261 | ||
262 | /* If we're going to reload, we need to lock all the pages to prevent | |
263 | * races. | |
264 | */ | |
b61f7dcf DH |
265 | ret = -ERESTARTSYS; |
266 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
267 | goto error; | |
f3ddee8d | 268 | |
b61f7dcf DH |
269 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
270 | goto success; | |
f3ddee8d | 271 | |
b61f7dcf DH |
272 | up_read(&dvnode->validate_lock); |
273 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
274 | goto error; | |
275 | ||
276 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
f3ddee8d DH |
277 | ret = afs_fetch_data(dvnode, key, req); |
278 | if (ret < 0) | |
b61f7dcf | 279 | goto error_unlock; |
f3ddee8d DH |
280 | |
281 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
282 | ||
283 | if (req->len < req->file_size) | |
284 | goto content_has_grown; | |
285 | ||
286 | /* Validate the data we just read. */ | |
287 | ret = -EIO; | |
288 | for (i = 0; i < req->nr_pages; i++) | |
289 | if (!afs_dir_check_page(dvnode, req->pages[i], | |
290 | req->actual_len)) | |
b61f7dcf | 291 | goto error_unlock; |
f3ddee8d DH |
292 | |
293 | // TODO: Trim excess pages | |
294 | ||
295 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
296 | } | |
297 | ||
b61f7dcf | 298 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 299 | success: |
f3ddee8d DH |
300 | return req; |
301 | ||
f3ddee8d | 302 | error_unlock: |
b61f7dcf | 303 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
304 | error: |
305 | afs_put_read(req); | |
306 | _leave(" = %d", ret); | |
307 | return ERR_PTR(ret); | |
308 | ||
309 | content_has_grown: | |
b61f7dcf | 310 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
311 | afs_put_read(req); |
312 | goto retry; | |
313 | } | |
314 | ||
1da177e4 LT |
315 | /* |
316 | * deal with one block in an AFS directory | |
317 | */ | |
1bbae9f8 | 318 | static int afs_dir_iterate_block(struct dir_context *ctx, |
00317636 | 319 | union afs_xdr_dir_block *block, |
1bbae9f8 | 320 | unsigned blkoff) |
1da177e4 | 321 | { |
00317636 | 322 | union afs_xdr_dirent *dire; |
1da177e4 LT |
323 | unsigned offset, next, curr; |
324 | size_t nlen; | |
1bbae9f8 | 325 | int tmp; |
1da177e4 | 326 | |
1bbae9f8 | 327 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 328 | |
00317636 | 329 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
330 | |
331 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
332 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
333 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
334 | offset = next |
335 | ) { | |
336 | next = offset + 1; | |
337 | ||
338 | /* skip entries marked unused in the bitmap */ | |
00317636 | 339 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 340 | (1 << (offset % 8)))) { |
5b5e0928 | 341 | _debug("ENT[%zu.%u]: unused", |
00317636 | 342 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 343 | if (offset >= curr) |
1bbae9f8 | 344 | ctx->pos = blkoff + |
00317636 | 345 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
346 | continue; |
347 | } | |
348 | ||
349 | /* got a valid entry */ | |
350 | dire = &block->dirents[offset]; | |
351 | nlen = strnlen(dire->u.name, | |
352 | sizeof(*block) - | |
00317636 | 353 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 354 | |
5b5e0928 | 355 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 356 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
357 | (offset < curr ? "skip" : "fill"), |
358 | nlen, dire->u.name); | |
359 | ||
360 | /* work out where the next possible entry is */ | |
00317636 | 361 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 362 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 363 | _debug("ENT[%zu.%u]:" |
1da177e4 | 364 | " %u travelled beyond end dir block" |
5b5e0928 | 365 | " (len %u/%zu)", |
00317636 | 366 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
367 | offset, next, tmp, nlen); |
368 | return -EIO; | |
369 | } | |
00317636 | 370 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 371 | (1 << (next % 8)))) { |
5b5e0928 AD |
372 | _debug("ENT[%zu.%u]:" |
373 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 374 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
375 | offset, next, tmp, nlen); |
376 | return -EIO; | |
377 | } | |
378 | ||
5b5e0928 | 379 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 380 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
381 | next, tmp, nlen); |
382 | next++; | |
383 | } | |
384 | ||
385 | /* skip if starts before the current position */ | |
386 | if (offset < curr) | |
387 | continue; | |
388 | ||
389 | /* found the next entry */ | |
1bbae9f8 | 390 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 391 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
392 | (ctx->actor == afs_lookup_filldir || |
393 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 394 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
395 | _leave(" = 0 [full]"); |
396 | return 0; | |
397 | } | |
398 | ||
00317636 | 399 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
400 | } |
401 | ||
402 | _leave(" = 1 [more]"); | |
403 | return 1; | |
ec26815a | 404 | } |
1da177e4 | 405 | |
1da177e4 | 406 | /* |
08e0e7c8 | 407 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 408 | */ |
1bbae9f8 AV |
409 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
410 | struct key *key) | |
1da177e4 | 411 | { |
f3ddee8d | 412 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
413 | struct afs_xdr_dir_page *dbuf; |
414 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 415 | struct afs_read *req; |
1da177e4 LT |
416 | struct page *page; |
417 | unsigned blkoff, limit; | |
418 | int ret; | |
419 | ||
1bbae9f8 | 420 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 421 | |
08e0e7c8 | 422 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
423 | _leave(" = -ESTALE"); |
424 | return -ESTALE; | |
425 | } | |
426 | ||
f3ddee8d DH |
427 | req = afs_read_dir(dvnode, key); |
428 | if (IS_ERR(req)) | |
429 | return PTR_ERR(req); | |
430 | ||
1da177e4 | 431 | /* round the file position up to the next entry boundary */ |
00317636 DH |
432 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
433 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
434 | |
435 | /* walk through the blocks in sequence */ | |
436 | ret = 0; | |
f3ddee8d | 437 | while (ctx->pos < req->actual_len) { |
00317636 | 438 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 439 | |
f3ddee8d DH |
440 | /* Fetch the appropriate page from the directory and re-add it |
441 | * to the LRU. | |
442 | */ | |
443 | page = req->pages[blkoff / PAGE_SIZE]; | |
444 | if (!page) { | |
445 | ret = -EIO; | |
1da177e4 LT |
446 | break; |
447 | } | |
f3ddee8d | 448 | mark_page_accessed(page); |
1da177e4 LT |
449 | |
450 | limit = blkoff & ~(PAGE_SIZE - 1); | |
451 | ||
f3ddee8d | 452 | dbuf = kmap(page); |
1da177e4 LT |
453 | |
454 | /* deal with the individual blocks stashed on this page */ | |
455 | do { | |
456 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 457 | sizeof(union afs_xdr_dir_block)]; |
1bbae9f8 | 458 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 | 459 | if (ret != 1) { |
f3ddee8d | 460 | kunmap(page); |
1da177e4 LT |
461 | goto out; |
462 | } | |
463 | ||
00317636 | 464 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 465 | |
1bbae9f8 | 466 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 467 | |
f3ddee8d | 468 | kunmap(page); |
1da177e4 LT |
469 | ret = 0; |
470 | } | |
471 | ||
ec26815a | 472 | out: |
b61f7dcf | 473 | up_read(&dvnode->validate_lock); |
f3ddee8d | 474 | afs_put_read(req); |
1da177e4 LT |
475 | _leave(" = %d", ret); |
476 | return ret; | |
ec26815a | 477 | } |
1da177e4 | 478 | |
1da177e4 LT |
479 | /* |
480 | * read an AFS directory | |
481 | */ | |
1bbae9f8 | 482 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 483 | { |
215804a9 | 484 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 485 | } |
1da177e4 | 486 | |
1da177e4 | 487 | /* |
5cf9dd55 | 488 | * Search the directory for a single name |
1da177e4 LT |
489 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
490 | * uniquifier through dtype | |
491 | */ | |
5cf9dd55 DH |
492 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
493 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 494 | { |
5cf9dd55 DH |
495 | struct afs_lookup_one_cookie *cookie = |
496 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 497 | |
1bbae9f8 AV |
498 | _enter("{%s,%u},%s,%u,,%llu,%u", |
499 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 500 | (unsigned long long) ino, dtype); |
1da177e4 | 501 | |
08e0e7c8 | 502 | /* insanity checks first */ |
00317636 DH |
503 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
504 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 505 | |
1bbae9f8 AV |
506 | if (cookie->name.len != nlen || |
507 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
508 | _leave(" = 0 [no]"); |
509 | return 0; | |
510 | } | |
511 | ||
512 | cookie->fid.vnode = ino; | |
513 | cookie->fid.unique = dtype; | |
514 | cookie->found = 1; | |
515 | ||
516 | _leave(" = -1 [found]"); | |
517 | return -1; | |
ec26815a | 518 | } |
1da177e4 | 519 | |
1da177e4 | 520 | /* |
5cf9dd55 | 521 | * Do a lookup of a single name in a directory |
260a9803 | 522 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 523 | */ |
5cf9dd55 DH |
524 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
525 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 526 | { |
1bbae9f8 | 527 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
528 | struct afs_lookup_one_cookie cookie = { |
529 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
530 | .name = dentry->d_name, |
531 | .fid.vid = as->volume->vid | |
532 | }; | |
1da177e4 LT |
533 | int ret; |
534 | ||
a455589f | 535 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 536 | |
1da177e4 | 537 | /* search the directory */ |
1bbae9f8 | 538 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 539 | if (ret < 0) { |
08e0e7c8 DH |
540 | _leave(" = %d [iter]", ret); |
541 | return ret; | |
1da177e4 LT |
542 | } |
543 | ||
544 | ret = -ENOENT; | |
545 | if (!cookie.found) { | |
08e0e7c8 DH |
546 | _leave(" = -ENOENT [not found]"); |
547 | return -ENOENT; | |
1da177e4 LT |
548 | } |
549 | ||
08e0e7c8 DH |
550 | *fid = cookie.fid; |
551 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
552 | return 0; | |
553 | } | |
554 | ||
5cf9dd55 DH |
555 | /* |
556 | * search the directory for a name | |
557 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
558 | * uniquifier through dtype | |
559 | */ | |
560 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
561 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
562 | { | |
563 | struct afs_lookup_cookie *cookie = | |
564 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
565 | int ret; | |
566 | ||
567 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
568 | cookie->name.name, cookie->name.len, name, nlen, | |
569 | (unsigned long long) ino, dtype); | |
570 | ||
571 | /* insanity checks first */ | |
00317636 DH |
572 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
573 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
574 | |
575 | if (cookie->found) { | |
576 | if (cookie->nr_fids < 50) { | |
577 | cookie->fids[cookie->nr_fids].vnode = ino; | |
578 | cookie->fids[cookie->nr_fids].unique = dtype; | |
579 | cookie->nr_fids++; | |
580 | } | |
581 | } else if (cookie->name.len == nlen && | |
582 | memcmp(cookie->name.name, name, nlen) == 0) { | |
583 | cookie->fids[0].vnode = ino; | |
584 | cookie->fids[0].unique = dtype; | |
585 | cookie->found = 1; | |
586 | if (cookie->one_only) | |
587 | return -1; | |
588 | } | |
589 | ||
590 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
591 | _leave(" = %d", ret); | |
592 | return ret; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
597 | * files in one go and create inodes for them. The inode of the file we were | |
598 | * asked for is returned. | |
599 | */ | |
600 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
601 | struct key *key) | |
602 | { | |
603 | struct afs_lookup_cookie *cookie; | |
604 | struct afs_cb_interest *cbi = NULL; | |
605 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
606 | struct afs_iget_data data; | |
607 | struct afs_fs_cursor fc; | |
608 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
609 | struct inode *inode = NULL; | |
610 | int ret, i; | |
611 | ||
612 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
613 | ||
614 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
615 | if (!cookie) | |
616 | return ERR_PTR(-ENOMEM); | |
617 | ||
618 | cookie->ctx.actor = afs_lookup_filldir; | |
619 | cookie->name = dentry->d_name; | |
620 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
621 | ||
622 | read_seqlock_excl(&dvnode->cb_lock); | |
623 | if (dvnode->cb_interest && | |
624 | dvnode->cb_interest->server && | |
625 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
626 | cookie->one_only = true; | |
627 | read_sequnlock_excl(&dvnode->cb_lock); | |
628 | ||
629 | for (i = 0; i < 50; i++) | |
630 | cookie->fids[i].vid = as->volume->vid; | |
631 | ||
632 | /* search the directory */ | |
633 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
634 | if (ret < 0) { | |
635 | inode = ERR_PTR(ret); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | inode = ERR_PTR(-ENOENT); | |
640 | if (!cookie->found) | |
641 | goto out; | |
642 | ||
643 | /* Check to see if we already have an inode for the primary fid. */ | |
644 | data.volume = dvnode->volume; | |
645 | data.fid = cookie->fids[0]; | |
646 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
647 | if (inode) | |
648 | goto out; | |
649 | ||
650 | /* Need space for examining all the selected files */ | |
651 | inode = ERR_PTR(-ENOMEM); | |
652 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
653 | GFP_KERNEL); | |
654 | if (!cookie->statuses) | |
655 | goto out; | |
656 | ||
657 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
658 | GFP_KERNEL); | |
659 | if (!cookie->callbacks) | |
660 | goto out_s; | |
661 | ||
662 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
663 | * lookups contained therein are stored in the reply without aborting | |
664 | * the whole operation. | |
665 | */ | |
666 | if (cookie->one_only) | |
667 | goto no_inline_bulk_status; | |
668 | ||
669 | inode = ERR_PTR(-ERESTARTSYS); | |
670 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
671 | while (afs_select_fileserver(&fc)) { | |
672 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
673 | &fc.cbi->server->flags)) { | |
674 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
675 | fc.ac.error = -ECONNABORTED; | |
676 | break; | |
677 | } | |
678 | afs_fs_inline_bulk_status(&fc, | |
679 | afs_v2net(dvnode), | |
680 | cookie->fids, | |
681 | cookie->statuses, | |
682 | cookie->callbacks, | |
683 | cookie->nr_fids, NULL); | |
684 | } | |
685 | ||
686 | if (fc.ac.error == 0) | |
687 | cbi = afs_get_cb_interest(fc.cbi); | |
688 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
689 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
690 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
691 | } | |
692 | ||
693 | if (!IS_ERR(inode)) | |
694 | goto success; | |
695 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
696 | goto out_c; | |
697 | ||
698 | no_inline_bulk_status: | |
699 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
700 | * any of the lookups fails - so, for the moment, revert to | |
701 | * FS.FetchStatus for just the primary fid. | |
702 | */ | |
703 | cookie->nr_fids = 1; | |
704 | inode = ERR_PTR(-ERESTARTSYS); | |
705 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
706 | while (afs_select_fileserver(&fc)) { | |
707 | afs_fs_fetch_status(&fc, | |
708 | afs_v2net(dvnode), | |
709 | cookie->fids, | |
710 | cookie->statuses, | |
711 | cookie->callbacks, | |
712 | NULL); | |
713 | } | |
714 | ||
715 | if (fc.ac.error == 0) | |
716 | cbi = afs_get_cb_interest(fc.cbi); | |
717 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
718 | } | |
719 | ||
720 | if (IS_ERR(inode)) | |
721 | goto out_c; | |
722 | ||
723 | for (i = 0; i < cookie->nr_fids; i++) | |
724 | cookie->statuses[i].abort_code = 0; | |
725 | ||
726 | success: | |
727 | /* Turn all the files into inodes and save the first one - which is the | |
728 | * one we actually want. | |
729 | */ | |
730 | if (cookie->statuses[0].abort_code != 0) | |
731 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
732 | ||
733 | for (i = 0; i < cookie->nr_fids; i++) { | |
734 | struct inode *ti; | |
735 | ||
736 | if (cookie->statuses[i].abort_code != 0) | |
737 | continue; | |
738 | ||
739 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
740 | &cookie->statuses[i], | |
741 | &cookie->callbacks[i], | |
742 | cbi); | |
743 | if (i == 0) { | |
744 | inode = ti; | |
745 | } else { | |
746 | if (!IS_ERR(ti)) | |
747 | iput(ti); | |
748 | } | |
749 | } | |
750 | ||
751 | out_c: | |
752 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
753 | kfree(cookie->callbacks); | |
754 | out_s: | |
755 | kfree(cookie->statuses); | |
756 | out: | |
757 | kfree(cookie); | |
758 | return inode; | |
759 | } | |
760 | ||
6f8880d8 DH |
761 | /* |
762 | * Look up an entry in a directory with @sys substitution. | |
763 | */ | |
764 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
765 | struct key *key) | |
766 | { | |
767 | struct afs_sysnames *subs; | |
768 | struct afs_net *net = afs_i2net(dir); | |
769 | struct dentry *ret; | |
770 | char *buf, *p, *name; | |
771 | int len, i; | |
772 | ||
773 | _enter(""); | |
774 | ||
775 | ret = ERR_PTR(-ENOMEM); | |
776 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
777 | if (!buf) | |
778 | goto out_p; | |
779 | if (dentry->d_name.len > 4) { | |
780 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
781 | p += dentry->d_name.len - 4; | |
782 | } | |
783 | ||
784 | /* There is an ordered list of substitutes that we have to try. */ | |
785 | read_lock(&net->sysnames_lock); | |
786 | subs = net->sysnames; | |
787 | refcount_inc(&subs->usage); | |
788 | read_unlock(&net->sysnames_lock); | |
789 | ||
790 | for (i = 0; i < subs->nr; i++) { | |
791 | name = subs->subs[i]; | |
792 | len = dentry->d_name.len - 4 + strlen(name); | |
793 | if (len >= AFSNAMEMAX) { | |
794 | ret = ERR_PTR(-ENAMETOOLONG); | |
795 | goto out_s; | |
796 | } | |
797 | ||
798 | strcpy(p, name); | |
799 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
800 | if (IS_ERR(ret) || d_is_positive(ret)) | |
801 | goto out_s; | |
802 | dput(ret); | |
803 | } | |
804 | ||
805 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
806 | * the cached dentry to hide changes to the sysnames list. | |
807 | */ | |
808 | ret = NULL; | |
809 | out_s: | |
810 | afs_put_sysnames(subs); | |
811 | kfree(buf); | |
812 | out_p: | |
813 | key_put(key); | |
814 | return ret; | |
815 | } | |
816 | ||
08e0e7c8 DH |
817 | /* |
818 | * look up an entry in a directory | |
819 | */ | |
260a9803 | 820 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 821 | unsigned int flags) |
08e0e7c8 | 822 | { |
5cf9dd55 | 823 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 824 | struct inode *inode; |
34b2a88f | 825 | struct dentry *d; |
00d3b7a4 | 826 | struct key *key; |
08e0e7c8 DH |
827 | int ret; |
828 | ||
a455589f | 829 | _enter("{%x:%u},%p{%pd},", |
5cf9dd55 | 830 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 831 | |
2b0143b5 | 832 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 833 | |
45222b9e | 834 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
835 | _leave(" = -ENAMETOOLONG"); |
836 | return ERR_PTR(-ENAMETOOLONG); | |
837 | } | |
838 | ||
5cf9dd55 | 839 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
840 | _leave(" = -ESTALE"); |
841 | return ERR_PTR(-ESTALE); | |
842 | } | |
843 | ||
5cf9dd55 | 844 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
845 | if (IS_ERR(key)) { |
846 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 847 | return ERR_CAST(key); |
00d3b7a4 DH |
848 | } |
849 | ||
5cf9dd55 | 850 | ret = afs_validate(dvnode, key); |
260a9803 DH |
851 | if (ret < 0) { |
852 | key_put(key); | |
853 | _leave(" = %d [val]", ret); | |
854 | return ERR_PTR(ret); | |
855 | } | |
856 | ||
6f8880d8 DH |
857 | if (dentry->d_name.len >= 4 && |
858 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
859 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
860 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
861 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
862 | return afs_lookup_atsys(dir, dentry, key); | |
863 | ||
d55b4da4 | 864 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 865 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 866 | key_put(key); |
34b2a88f AV |
867 | if (inode == ERR_PTR(-ENOENT)) { |
868 | inode = afs_try_auto_mntpt(dentry, dir); | |
34b2a88f AV |
869 | } else { |
870 | dentry->d_fsdata = | |
871 | (void *)(unsigned long)dvnode->status.data_version; | |
08e0e7c8 | 872 | } |
34b2a88f AV |
873 | d = d_splice_alias(inode, dentry); |
874 | if (!IS_ERR_OR_NULL(d)) | |
875 | d->d_fsdata = dentry->d_fsdata; | |
876 | return d; | |
ec26815a | 877 | } |
1da177e4 | 878 | |
1da177e4 LT |
879 | /* |
880 | * check that a dentry lookup hit has found a valid entry | |
881 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
882 | * inode | |
1da177e4 | 883 | */ |
0b728e19 | 884 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 885 | { |
260a9803 | 886 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 887 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 888 | struct dentry *parent; |
c435ee34 | 889 | struct inode *inode; |
00d3b7a4 | 890 | struct key *key; |
a4ff7401 | 891 | long dir_version, de_version; |
1da177e4 LT |
892 | int ret; |
893 | ||
0b728e19 | 894 | if (flags & LOOKUP_RCU) |
34286d66 NP |
895 | return -ECHILD; |
896 | ||
c435ee34 DH |
897 | if (d_really_is_positive(dentry)) { |
898 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
899 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
900 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 901 | vnode->flags); |
c435ee34 | 902 | } else { |
a455589f | 903 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 904 | } |
1da177e4 | 905 | |
260a9803 | 906 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
907 | if (IS_ERR(key)) |
908 | key = NULL; | |
909 | ||
c435ee34 DH |
910 | if (d_really_is_positive(dentry)) { |
911 | inode = d_inode(dentry); | |
912 | if (inode) { | |
913 | vnode = AFS_FS_I(inode); | |
914 | afs_validate(vnode, key); | |
915 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
916 | goto out_bad; | |
917 | } | |
918 | } | |
919 | ||
1da177e4 | 920 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 921 | parent = dget_parent(dentry); |
2b0143b5 | 922 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 923 | |
260a9803 | 924 | /* validate the parent directory */ |
c435ee34 | 925 | afs_validate(dir, key); |
260a9803 DH |
926 | |
927 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 928 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 929 | goto out_bad_parent; |
1da177e4 LT |
930 | } |
931 | ||
a4ff7401 DH |
932 | /* We only need to invalidate a dentry if the server's copy changed |
933 | * behind our back. If we made the change, it's no problem. Note that | |
934 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
935 | * version. | |
936 | */ | |
937 | dir_version = (long)dir->status.data_version; | |
938 | de_version = (long)dentry->d_fsdata; | |
939 | if (de_version == dir_version) | |
940 | goto out_valid; | |
941 | ||
942 | dir_version = (long)dir->invalid_before; | |
943 | if (de_version - dir_version >= 0) | |
944 | goto out_valid; | |
1da177e4 | 945 | |
260a9803 | 946 | _debug("dir modified"); |
d55b4da4 | 947 | afs_stat_v(dir, n_reval); |
260a9803 DH |
948 | |
949 | /* search the directory for this vnode */ | |
5cf9dd55 | 950 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
951 | switch (ret) { |
952 | case 0: | |
953 | /* the filename maps to something */ | |
2b0143b5 | 954 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
955 | goto out_bad_parent; |
956 | inode = d_inode(dentry); | |
957 | if (is_bad_inode(inode)) { | |
a455589f AV |
958 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
959 | dentry); | |
c435ee34 | 960 | goto out_bad_parent; |
1da177e4 LT |
961 | } |
962 | ||
c435ee34 DH |
963 | vnode = AFS_FS_I(inode); |
964 | ||
1da177e4 LT |
965 | /* if the vnode ID has changed, then the dirent points to a |
966 | * different file */ | |
08e0e7c8 | 967 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
968 | _debug("%pd: dirent changed [%u != %u]", |
969 | dentry, fid.vnode, | |
08e0e7c8 | 970 | vnode->fid.vnode); |
1da177e4 LT |
971 | goto not_found; |
972 | } | |
973 | ||
974 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
975 | * been deleted and replaced, and the original vnode ID has |
976 | * been reused */ | |
08e0e7c8 | 977 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
978 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
979 | dentry, fid.unique, | |
7a224228 | 980 | vnode->fid.unique, |
c435ee34 DH |
981 | vnode->vfs_inode.i_generation); |
982 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 983 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 984 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 985 | goto not_found; |
1da177e4 | 986 | } |
260a9803 | 987 | goto out_valid; |
08e0e7c8 | 988 | |
260a9803 DH |
989 | case -ENOENT: |
990 | /* the filename is unknown */ | |
a455589f | 991 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 992 | if (d_really_is_positive(dentry)) |
260a9803 DH |
993 | goto not_found; |
994 | goto out_valid; | |
1da177e4 | 995 | |
260a9803 | 996 | default: |
a455589f AV |
997 | _debug("failed to iterate dir %pd: %d", |
998 | parent, ret); | |
c435ee34 | 999 | goto out_bad_parent; |
08e0e7c8 DH |
1000 | } |
1001 | ||
ec26815a | 1002 | out_valid: |
a4ff7401 | 1003 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1004 | dput(parent); |
00d3b7a4 | 1005 | key_put(key); |
1da177e4 LT |
1006 | _leave(" = 1 [valid]"); |
1007 | return 1; | |
1008 | ||
1009 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1010 | not_found: |
1da177e4 LT |
1011 | spin_lock(&dentry->d_lock); |
1012 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1013 | spin_unlock(&dentry->d_lock); | |
1014 | ||
c435ee34 | 1015 | out_bad_parent: |
a455589f | 1016 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1017 | dput(parent); |
c435ee34 | 1018 | out_bad: |
00d3b7a4 | 1019 | key_put(key); |
1da177e4 LT |
1020 | |
1021 | _leave(" = 0 [bad]"); | |
1022 | return 0; | |
ec26815a | 1023 | } |
1da177e4 | 1024 | |
1da177e4 LT |
1025 | /* |
1026 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1027 | * sleep) | |
1028 | * - called from dput() when d_count is going to 0. | |
1029 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1030 | */ | |
fe15ce44 | 1031 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1032 | { |
a455589f | 1033 | _enter("%pd", dentry); |
1da177e4 LT |
1034 | |
1035 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1036 | goto zap; | |
1037 | ||
2b0143b5 DH |
1038 | if (d_really_is_positive(dentry) && |
1039 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1040 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1041 | goto zap; |
1da177e4 LT |
1042 | |
1043 | _leave(" = 0 [keep]"); | |
1044 | return 0; | |
1045 | ||
ec26815a | 1046 | zap: |
1da177e4 LT |
1047 | _leave(" = 1 [zap]"); |
1048 | return 1; | |
ec26815a | 1049 | } |
260a9803 DH |
1050 | |
1051 | /* | |
1052 | * handle dentry release | |
1053 | */ | |
66c7e1d3 | 1054 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1055 | { |
a455589f | 1056 | _enter("%pd", dentry); |
260a9803 DH |
1057 | } |
1058 | ||
d2ddc776 DH |
1059 | /* |
1060 | * Create a new inode for create/mkdir/symlink | |
1061 | */ | |
1062 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1063 | struct dentry *new_dentry, | |
1064 | struct afs_fid *newfid, | |
1065 | struct afs_file_status *newstatus, | |
1066 | struct afs_callback *newcb) | |
1067 | { | |
5a813276 | 1068 | struct afs_vnode *vnode; |
d2ddc776 DH |
1069 | struct inode *inode; |
1070 | ||
1071 | if (fc->ac.error < 0) | |
1072 | return; | |
1073 | ||
bc1527dc DH |
1074 | d_drop(new_dentry); |
1075 | ||
d2ddc776 DH |
1076 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
1077 | newfid, newstatus, newcb, fc->cbi); | |
1078 | if (IS_ERR(inode)) { | |
1079 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1080 | * the new directory on the server. | |
1081 | */ | |
1082 | fc->ac.error = PTR_ERR(inode); | |
1083 | return; | |
1084 | } | |
1085 | ||
5a813276 DH |
1086 | vnode = AFS_FS_I(inode); |
1087 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
bc1527dc | 1088 | d_add(new_dentry, inode); |
d2ddc776 DH |
1089 | } |
1090 | ||
260a9803 DH |
1091 | /* |
1092 | * create a directory on an AFS filesystem | |
1093 | */ | |
18bb1db3 | 1094 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1095 | { |
d2ddc776 DH |
1096 | struct afs_file_status newstatus; |
1097 | struct afs_fs_cursor fc; | |
1098 | struct afs_callback newcb; | |
1099 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1100 | struct afs_fid newfid; | |
260a9803 | 1101 | struct key *key; |
63a4681f | 1102 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1103 | int ret; |
1104 | ||
d2ddc776 | 1105 | mode |= S_IFDIR; |
260a9803 | 1106 | |
a455589f AV |
1107 | _enter("{%x:%u},{%pd},%ho", |
1108 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1109 | |
260a9803 DH |
1110 | key = afs_request_key(dvnode->volume->cell); |
1111 | if (IS_ERR(key)) { | |
1112 | ret = PTR_ERR(key); | |
1113 | goto error; | |
1114 | } | |
1115 | ||
d2ddc776 DH |
1116 | ret = -ERESTARTSYS; |
1117 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1118 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1119 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1120 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1121 | &newfid, &newstatus, &newcb); |
1122 | } | |
260a9803 | 1123 | |
d2ddc776 DH |
1124 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1125 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1126 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1127 | ret = afs_end_vnode_operation(&fc); | |
1128 | if (ret < 0) | |
1129 | goto error_key; | |
4433b691 DH |
1130 | } else { |
1131 | goto error_key; | |
260a9803 DH |
1132 | } |
1133 | ||
63a4681f DH |
1134 | if (ret == 0 && |
1135 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1136 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1137 | afs_edit_dir_for_create); | |
1138 | ||
260a9803 DH |
1139 | key_put(key); |
1140 | _leave(" = 0"); | |
1141 | return 0; | |
1142 | ||
d2ddc776 | 1143 | error_key: |
260a9803 DH |
1144 | key_put(key); |
1145 | error: | |
1146 | d_drop(dentry); | |
1147 | _leave(" = %d", ret); | |
1148 | return ret; | |
1149 | } | |
1150 | ||
d2ddc776 DH |
1151 | /* |
1152 | * Remove a subdir from a directory. | |
1153 | */ | |
1154 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1155 | { | |
1156 | if (d_really_is_positive(dentry)) { | |
1157 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1158 | ||
1159 | clear_nlink(&vnode->vfs_inode); | |
1160 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1161 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1162 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1163 | } |
1164 | } | |
1165 | ||
260a9803 DH |
1166 | /* |
1167 | * remove a directory from an AFS filesystem | |
1168 | */ | |
1169 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1170 | { | |
d2ddc776 DH |
1171 | struct afs_fs_cursor fc; |
1172 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 | 1173 | struct key *key; |
63a4681f | 1174 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1175 | int ret; |
1176 | ||
a455589f AV |
1177 | _enter("{%x:%u},{%pd}", |
1178 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1179 | |
260a9803 DH |
1180 | key = afs_request_key(dvnode->volume->cell); |
1181 | if (IS_ERR(key)) { | |
1182 | ret = PTR_ERR(key); | |
1183 | goto error; | |
1184 | } | |
1185 | ||
d2ddc776 DH |
1186 | ret = -ERESTARTSYS; |
1187 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1188 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1189 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f DH |
1190 | afs_fs_remove(&fc, dentry->d_name.name, true, |
1191 | data_version); | |
d2ddc776 | 1192 | } |
260a9803 | 1193 | |
d2ddc776 DH |
1194 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1195 | ret = afs_end_vnode_operation(&fc); | |
63a4681f | 1196 | if (ret == 0) { |
d2ddc776 | 1197 | afs_dir_remove_subdir(dentry); |
63a4681f DH |
1198 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1199 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1200 | afs_edit_dir_for_rmdir); | |
1201 | } | |
260a9803 DH |
1202 | } |
1203 | ||
1204 | key_put(key); | |
260a9803 | 1205 | error: |
260a9803 DH |
1206 | return ret; |
1207 | } | |
1208 | ||
1209 | /* | |
d2ddc776 DH |
1210 | * Remove a link to a file or symlink from a directory. |
1211 | * | |
1212 | * If the file was not deleted due to excess hard links, the fileserver will | |
1213 | * break the callback promise on the file - if it had one - before it returns | |
1214 | * to us, and if it was deleted, it won't | |
1215 | * | |
1216 | * However, if we didn't have a callback promise outstanding, or it was | |
1217 | * outstanding on a different server, then it won't break it either... | |
1218 | */ | |
440fbc3a DH |
1219 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1220 | unsigned long d_version_before, | |
1221 | unsigned long d_version_after) | |
d2ddc776 | 1222 | { |
440fbc3a | 1223 | bool dir_valid; |
d2ddc776 DH |
1224 | int ret = 0; |
1225 | ||
440fbc3a DH |
1226 | /* There were no intervening changes on the server if the version |
1227 | * number we got back was incremented by exactly 1. | |
1228 | */ | |
1229 | dir_valid = (d_version_after == d_version_before + 1); | |
1230 | ||
d2ddc776 DH |
1231 | if (d_really_is_positive(dentry)) { |
1232 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1233 | ||
440fbc3a DH |
1234 | if (dir_valid) { |
1235 | drop_nlink(&vnode->vfs_inode); | |
1236 | if (vnode->vfs_inode.i_nlink == 0) { | |
1237 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1238 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1239 | } | |
d2ddc776 | 1240 | ret = 0; |
440fbc3a DH |
1241 | } else { |
1242 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1243 | ||
1244 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1245 | kdebug("AFS_VNODE_DELETED"); | |
1246 | ||
1247 | ret = afs_validate(vnode, key); | |
1248 | if (ret == -ESTALE) | |
1249 | ret = 0; | |
1250 | } | |
d2ddc776 DH |
1251 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1252 | } | |
1253 | ||
1254 | return ret; | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1259 | */ |
1260 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1261 | { | |
d2ddc776 DH |
1262 | struct afs_fs_cursor fc; |
1263 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 | 1264 | struct key *key; |
440fbc3a | 1265 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
63a4681f | 1266 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1267 | int ret; |
1268 | ||
a455589f AV |
1269 | _enter("{%x:%u},{%pd}", |
1270 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1271 | |
45222b9e | 1272 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1273 | return -ENAMETOOLONG; |
260a9803 DH |
1274 | |
1275 | key = afs_request_key(dvnode->volume->cell); | |
1276 | if (IS_ERR(key)) { | |
1277 | ret = PTR_ERR(key); | |
1278 | goto error; | |
1279 | } | |
1280 | ||
d2ddc776 | 1281 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1282 | if (d_really_is_positive(dentry)) { |
1283 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1284 | ret = afs_validate(vnode, key); |
1285 | if (ret < 0) | |
d2ddc776 | 1286 | goto error_key; |
260a9803 DH |
1287 | } |
1288 | ||
d2ddc776 DH |
1289 | ret = -ERESTARTSYS; |
1290 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1291 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1292 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f DH |
1293 | afs_fs_remove(&fc, dentry->d_name.name, false, |
1294 | data_version); | |
d2ddc776 | 1295 | } |
260a9803 | 1296 | |
d2ddc776 DH |
1297 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1298 | ret = afs_end_vnode_operation(&fc); | |
1299 | if (ret == 0) | |
440fbc3a DH |
1300 | ret = afs_dir_remove_link( |
1301 | dentry, key, d_version, | |
1302 | (unsigned long)dvnode->status.data_version); | |
63a4681f DH |
1303 | if (ret == 0 && |
1304 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1305 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1306 | afs_edit_dir_for_unlink); | |
260a9803 DH |
1307 | } |
1308 | ||
d2ddc776 | 1309 | error_key: |
260a9803 DH |
1310 | key_put(key); |
1311 | error: | |
1312 | _leave(" = %d", ret); | |
1313 | return ret; | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * create a regular file on an AFS filesystem | |
1318 | */ | |
4acdaf27 | 1319 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1320 | bool excl) |
260a9803 | 1321 | { |
d2ddc776 DH |
1322 | struct afs_fs_cursor fc; |
1323 | struct afs_file_status newstatus; | |
1324 | struct afs_callback newcb; | |
43dd388b | 1325 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1326 | struct afs_fid newfid; |
260a9803 | 1327 | struct key *key; |
63a4681f | 1328 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1329 | int ret; |
1330 | ||
d2ddc776 | 1331 | mode |= S_IFREG; |
260a9803 | 1332 | |
a455589f AV |
1333 | _enter("{%x:%u},{%pd},%ho,", |
1334 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1335 | |
d2ddc776 DH |
1336 | ret = -ENAMETOOLONG; |
1337 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1338 | goto error; | |
1339 | ||
260a9803 DH |
1340 | key = afs_request_key(dvnode->volume->cell); |
1341 | if (IS_ERR(key)) { | |
1342 | ret = PTR_ERR(key); | |
1343 | goto error; | |
1344 | } | |
1345 | ||
d2ddc776 DH |
1346 | ret = -ERESTARTSYS; |
1347 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1348 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1349 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1350 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1351 | &newfid, &newstatus, &newcb); |
1352 | } | |
260a9803 | 1353 | |
d2ddc776 DH |
1354 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1355 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1356 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1357 | ret = afs_end_vnode_operation(&fc); | |
1358 | if (ret < 0) | |
1359 | goto error_key; | |
4433b691 DH |
1360 | } else { |
1361 | goto error_key; | |
260a9803 DH |
1362 | } |
1363 | ||
63a4681f DH |
1364 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1365 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1366 | afs_edit_dir_for_create); | |
1367 | ||
260a9803 DH |
1368 | key_put(key); |
1369 | _leave(" = 0"); | |
1370 | return 0; | |
1371 | ||
d2ddc776 | 1372 | error_key: |
260a9803 DH |
1373 | key_put(key); |
1374 | error: | |
1375 | d_drop(dentry); | |
1376 | _leave(" = %d", ret); | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * create a hard link between files in an AFS filesystem | |
1382 | */ | |
1383 | static int afs_link(struct dentry *from, struct inode *dir, | |
1384 | struct dentry *dentry) | |
1385 | { | |
d2ddc776 | 1386 | struct afs_fs_cursor fc; |
260a9803 DH |
1387 | struct afs_vnode *dvnode, *vnode; |
1388 | struct key *key; | |
63a4681f | 1389 | u64 data_version; |
260a9803 DH |
1390 | int ret; |
1391 | ||
2b0143b5 | 1392 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 | 1393 | dvnode = AFS_FS_I(dir); |
63a4681f | 1394 | data_version = dvnode->status.data_version; |
260a9803 | 1395 | |
a455589f | 1396 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1397 | vnode->fid.vid, vnode->fid.vnode, |
1398 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1399 | dentry); |
260a9803 | 1400 | |
d2ddc776 DH |
1401 | ret = -ENAMETOOLONG; |
1402 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1403 | goto error; | |
1404 | ||
260a9803 DH |
1405 | key = afs_request_key(dvnode->volume->cell); |
1406 | if (IS_ERR(key)) { | |
1407 | ret = PTR_ERR(key); | |
1408 | goto error; | |
1409 | } | |
1410 | ||
d2ddc776 DH |
1411 | ret = -ERESTARTSYS; |
1412 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1413 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1414 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1415 | goto error_key; |
d2ddc776 DH |
1416 | } |
1417 | ||
1418 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1419 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
1420 | fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); | |
63a4681f | 1421 | afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); |
d2ddc776 DH |
1422 | } |
1423 | ||
1424 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1425 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1426 | ihold(&vnode->vfs_inode); | |
1427 | d_instantiate(dentry, &vnode->vfs_inode); | |
1428 | ||
1429 | mutex_unlock(&vnode->io_lock); | |
1430 | ret = afs_end_vnode_operation(&fc); | |
1431 | if (ret < 0) | |
1432 | goto error_key; | |
4433b691 DH |
1433 | } else { |
1434 | goto error_key; | |
d2ddc776 | 1435 | } |
260a9803 | 1436 | |
63a4681f DH |
1437 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1438 | afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, | |
1439 | afs_edit_dir_for_link); | |
1440 | ||
260a9803 DH |
1441 | key_put(key); |
1442 | _leave(" = 0"); | |
1443 | return 0; | |
1444 | ||
d2ddc776 | 1445 | error_key: |
260a9803 DH |
1446 | key_put(key); |
1447 | error: | |
1448 | d_drop(dentry); | |
1449 | _leave(" = %d", ret); | |
1450 | return ret; | |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * create a symlink in an AFS filesystem | |
1455 | */ | |
1456 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1457 | const char *content) | |
1458 | { | |
d2ddc776 DH |
1459 | struct afs_fs_cursor fc; |
1460 | struct afs_file_status newstatus; | |
1461 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1462 | struct afs_fid newfid; | |
260a9803 | 1463 | struct key *key; |
63a4681f | 1464 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1465 | int ret; |
1466 | ||
a455589f AV |
1467 | _enter("{%x:%u},{%pd},%s", |
1468 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1469 | content); |
1470 | ||
d2ddc776 DH |
1471 | ret = -ENAMETOOLONG; |
1472 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1473 | goto error; | |
1474 | ||
260a9803 | 1475 | ret = -EINVAL; |
45222b9e | 1476 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1477 | goto error; |
1478 | ||
1479 | key = afs_request_key(dvnode->volume->cell); | |
1480 | if (IS_ERR(key)) { | |
1481 | ret = PTR_ERR(key); | |
1482 | goto error; | |
1483 | } | |
1484 | ||
d2ddc776 DH |
1485 | ret = -ERESTARTSYS; |
1486 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1487 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1488 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f DH |
1489 | afs_fs_symlink(&fc, dentry->d_name.name, |
1490 | content, data_version, | |
d2ddc776 DH |
1491 | &newfid, &newstatus); |
1492 | } | |
260a9803 | 1493 | |
d2ddc776 DH |
1494 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1495 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1496 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1497 | ret = afs_end_vnode_operation(&fc); | |
1498 | if (ret < 0) | |
1499 | goto error_key; | |
4433b691 DH |
1500 | } else { |
1501 | goto error_key; | |
260a9803 DH |
1502 | } |
1503 | ||
63a4681f DH |
1504 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1505 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1506 | afs_edit_dir_for_symlink); | |
1507 | ||
260a9803 DH |
1508 | key_put(key); |
1509 | _leave(" = 0"); | |
1510 | return 0; | |
1511 | ||
d2ddc776 | 1512 | error_key: |
260a9803 DH |
1513 | key_put(key); |
1514 | error: | |
1515 | d_drop(dentry); | |
1516 | _leave(" = %d", ret); | |
1517 | return ret; | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * rename a file in an AFS filesystem and/or move it between directories | |
1522 | */ | |
1523 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1524 | struct inode *new_dir, struct dentry *new_dentry, |
1525 | unsigned int flags) | |
260a9803 | 1526 | { |
d2ddc776 | 1527 | struct afs_fs_cursor fc; |
260a9803 DH |
1528 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1529 | struct key *key; | |
63a4681f DH |
1530 | u64 orig_data_version, new_data_version; |
1531 | bool new_negative = d_is_negative(new_dentry); | |
260a9803 DH |
1532 | int ret; |
1533 | ||
1cd66c93 MS |
1534 | if (flags) |
1535 | return -EINVAL; | |
1536 | ||
2b0143b5 | 1537 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1538 | orig_dvnode = AFS_FS_I(old_dir); |
1539 | new_dvnode = AFS_FS_I(new_dir); | |
63a4681f DH |
1540 | orig_data_version = orig_dvnode->status.data_version; |
1541 | new_data_version = new_dvnode->status.data_version; | |
260a9803 | 1542 | |
a455589f | 1543 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1544 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1545 | vnode->fid.vid, vnode->fid.vnode, | |
1546 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1547 | new_dentry); |
260a9803 | 1548 | |
260a9803 DH |
1549 | key = afs_request_key(orig_dvnode->volume->cell); |
1550 | if (IS_ERR(key)) { | |
1551 | ret = PTR_ERR(key); | |
1552 | goto error; | |
1553 | } | |
1554 | ||
d2ddc776 DH |
1555 | ret = -ERESTARTSYS; |
1556 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1557 | if (orig_dvnode != new_dvnode) { | |
1558 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1559 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1560 | goto error_key; |
d2ddc776 DH |
1561 | } |
1562 | } | |
1563 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1564 | fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); |
1565 | fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); | |
d2ddc776 | 1566 | afs_fs_rename(&fc, old_dentry->d_name.name, |
63a4681f DH |
1567 | new_dvnode, new_dentry->d_name.name, |
1568 | orig_data_version, new_data_version); | |
d2ddc776 DH |
1569 | } |
1570 | ||
1571 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1572 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1573 | if (orig_dvnode != new_dvnode) | |
1574 | mutex_unlock(&new_dvnode->io_lock); | |
1575 | ret = afs_end_vnode_operation(&fc); | |
1576 | if (ret < 0) | |
1577 | goto error_key; | |
1578 | } | |
1579 | ||
63a4681f DH |
1580 | if (ret == 0) { |
1581 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) | |
1582 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1583 | afs_edit_dir_for_rename); | |
1584 | ||
1585 | if (!new_negative && | |
1586 | test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1587 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1588 | afs_edit_dir_for_rename); | |
1589 | ||
1590 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1591 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1592 | &vnode->fid, afs_edit_dir_for_rename); | |
1593 | } | |
1594 | ||
d2ddc776 | 1595 | error_key: |
260a9803 DH |
1596 | key_put(key); |
1597 | error: | |
260a9803 DH |
1598 | _leave(" = %d", ret); |
1599 | return ret; | |
1600 | } | |
f3ddee8d DH |
1601 | |
1602 | /* | |
1603 | * Release a directory page and clean up its private state if it's not busy | |
1604 | * - return true if the page can now be released, false if not | |
1605 | */ | |
1606 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1607 | { | |
1608 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1609 | ||
1610 | _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); | |
1611 | ||
1612 | set_page_private(page, 0); | |
1613 | ClearPagePrivate(page); | |
1614 | ||
1615 | /* The directory will need reloading. */ | |
1616 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1617 | afs_stat_v(dvnode, n_relpg); | |
1618 | return 1; | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * invalidate part or all of a page | |
1623 | * - release a page and clean up its private data if offset is 0 (indicating | |
1624 | * the entire page) | |
1625 | */ | |
1626 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1627 | unsigned int length) | |
1628 | { | |
1629 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1630 | ||
1631 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1632 | ||
1633 | BUG_ON(!PageLocked(page)); | |
1634 | ||
1635 | /* The directory will need reloading. */ | |
1636 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1637 | afs_stat_v(dvnode, n_inval); | |
1638 | ||
1639 | /* we clean up only if the entire page is being invalidated */ | |
1640 | if (offset == 0 && length == PAGE_SIZE) { | |
1641 | set_page_private(page, 0); | |
1642 | ClearPagePrivate(page); | |
1643 | } | |
1644 | } |