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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 | 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) | |
183 | { | |
184 | struct afs_read *req; | |
185 | loff_t i_size; | |
186 | int nr_pages, nr_inline, i, n; | |
187 | int ret = -ENOMEM; | |
188 | ||
189 | retry: | |
190 | i_size = i_size_read(&dvnode->vfs_inode); | |
191 | if (i_size < 2048) | |
192 | return ERR_PTR(-EIO); | |
193 | if (i_size > 2048 * 1024) | |
194 | return ERR_PTR(-EFBIG); | |
195 | ||
196 | _enter("%llu", i_size); | |
197 | ||
198 | /* Get a request record to hold the page list. We want to hold it | |
199 | * inline if we can, but we don't want to make an order 1 allocation. | |
200 | */ | |
201 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
202 | nr_inline = nr_pages; | |
203 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
204 | nr_inline = 0; | |
205 | ||
206 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
207 | GFP_KERNEL); | |
208 | if (!req) | |
209 | return ERR_PTR(-ENOMEM); | |
210 | ||
211 | refcount_set(&req->usage, 1); | |
212 | req->nr_pages = nr_pages; | |
213 | req->actual_len = i_size; /* May change */ | |
214 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
215 | req->data_version = dvnode->status.data_version; /* May change */ | |
216 | if (nr_inline > 0) { | |
217 | req->pages = req->array; | |
218 | } else { | |
219 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
220 | GFP_KERNEL); | |
221 | if (!req->pages) | |
222 | goto error; | |
223 | } | |
224 | ||
225 | /* Get a list of all the pages that hold or will hold the directory | |
226 | * content. We need to fill in any gaps that we might find where the | |
227 | * memory reclaimer has been at work. If there are any gaps, we will | |
228 | * need to reread the entire directory contents. | |
229 | */ | |
230 | i = 0; | |
231 | do { | |
232 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
233 | req->nr_pages - i, | |
234 | req->pages + i); | |
235 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
236 | if (n == 0) { | |
237 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
238 | ||
239 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
240 | afs_stat_v(dvnode, n_inval); | |
241 | ||
242 | ret = -ENOMEM; | |
243 | req->pages[i] = __page_cache_alloc(gfp); | |
244 | if (!req->pages[i]) | |
245 | goto error; | |
246 | ret = add_to_page_cache_lru(req->pages[i], | |
247 | dvnode->vfs_inode.i_mapping, | |
248 | i, gfp); | |
249 | if (ret < 0) | |
250 | goto error; | |
251 | ||
252 | set_page_private(req->pages[i], 1); | |
253 | SetPagePrivate(req->pages[i]); | |
254 | unlock_page(req->pages[i]); | |
255 | i++; | |
256 | } else { | |
257 | i += n; | |
258 | } | |
259 | } while (i < req->nr_pages); | |
260 | ||
261 | /* If we're going to reload, we need to lock all the pages to prevent | |
262 | * races. | |
263 | */ | |
264 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
265 | ret = -ERESTARTSYS; | |
266 | for (i = 0; i < req->nr_pages; i++) | |
267 | if (lock_page_killable(req->pages[i]) < 0) | |
268 | goto error_unlock; | |
269 | ||
270 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
271 | goto success; | |
272 | ||
273 | ret = afs_fetch_data(dvnode, key, req); | |
274 | if (ret < 0) | |
275 | goto error_unlock_all; | |
276 | ||
277 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
278 | ||
279 | if (req->len < req->file_size) | |
280 | goto content_has_grown; | |
281 | ||
282 | /* Validate the data we just read. */ | |
283 | ret = -EIO; | |
284 | for (i = 0; i < req->nr_pages; i++) | |
285 | if (!afs_dir_check_page(dvnode, req->pages[i], | |
286 | req->actual_len)) | |
287 | goto error_unlock_all; | |
288 | ||
289 | // TODO: Trim excess pages | |
290 | ||
291 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
292 | } | |
293 | ||
294 | success: | |
295 | i = req->nr_pages; | |
296 | while (i > 0) | |
297 | unlock_page(req->pages[--i]); | |
298 | return req; | |
299 | ||
300 | error_unlock_all: | |
301 | i = req->nr_pages; | |
302 | error_unlock: | |
303 | while (i > 0) | |
304 | unlock_page(req->pages[--i]); | |
305 | error: | |
306 | afs_put_read(req); | |
307 | _leave(" = %d", ret); | |
308 | return ERR_PTR(ret); | |
309 | ||
310 | content_has_grown: | |
311 | i = req->nr_pages; | |
312 | while (i > 0) | |
313 | unlock_page(req->pages[--i]); | |
314 | afs_put_read(req); | |
315 | goto retry; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * deal with one block in an AFS directory | |
320 | */ | |
1bbae9f8 | 321 | static int afs_dir_iterate_block(struct dir_context *ctx, |
00317636 | 322 | union afs_xdr_dir_block *block, |
1bbae9f8 | 323 | unsigned blkoff) |
1da177e4 | 324 | { |
00317636 | 325 | union afs_xdr_dirent *dire; |
1da177e4 LT |
326 | unsigned offset, next, curr; |
327 | size_t nlen; | |
1bbae9f8 | 328 | int tmp; |
1da177e4 | 329 | |
1bbae9f8 | 330 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 331 | |
00317636 | 332 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
333 | |
334 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
335 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
336 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
337 | offset = next |
338 | ) { | |
339 | next = offset + 1; | |
340 | ||
341 | /* skip entries marked unused in the bitmap */ | |
00317636 | 342 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 343 | (1 << (offset % 8)))) { |
5b5e0928 | 344 | _debug("ENT[%zu.%u]: unused", |
00317636 | 345 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 346 | if (offset >= curr) |
1bbae9f8 | 347 | ctx->pos = blkoff + |
00317636 | 348 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
349 | continue; |
350 | } | |
351 | ||
352 | /* got a valid entry */ | |
353 | dire = &block->dirents[offset]; | |
354 | nlen = strnlen(dire->u.name, | |
355 | sizeof(*block) - | |
00317636 | 356 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 357 | |
5b5e0928 | 358 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 359 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
360 | (offset < curr ? "skip" : "fill"), |
361 | nlen, dire->u.name); | |
362 | ||
363 | /* work out where the next possible entry is */ | |
00317636 | 364 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 365 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 366 | _debug("ENT[%zu.%u]:" |
1da177e4 | 367 | " %u travelled beyond end dir block" |
5b5e0928 | 368 | " (len %u/%zu)", |
00317636 | 369 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
370 | offset, next, tmp, nlen); |
371 | return -EIO; | |
372 | } | |
00317636 | 373 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 374 | (1 << (next % 8)))) { |
5b5e0928 AD |
375 | _debug("ENT[%zu.%u]:" |
376 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 377 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
378 | offset, next, tmp, nlen); |
379 | return -EIO; | |
380 | } | |
381 | ||
5b5e0928 | 382 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 383 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
384 | next, tmp, nlen); |
385 | next++; | |
386 | } | |
387 | ||
388 | /* skip if starts before the current position */ | |
389 | if (offset < curr) | |
390 | continue; | |
391 | ||
392 | /* found the next entry */ | |
1bbae9f8 | 393 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 394 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
395 | (ctx->actor == afs_lookup_filldir || |
396 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 397 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
398 | _leave(" = 0 [full]"); |
399 | return 0; | |
400 | } | |
401 | ||
00317636 | 402 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
403 | } |
404 | ||
405 | _leave(" = 1 [more]"); | |
406 | return 1; | |
ec26815a | 407 | } |
1da177e4 | 408 | |
1da177e4 | 409 | /* |
08e0e7c8 | 410 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 411 | */ |
1bbae9f8 AV |
412 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
413 | struct key *key) | |
1da177e4 | 414 | { |
f3ddee8d | 415 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
416 | struct afs_xdr_dir_page *dbuf; |
417 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 418 | struct afs_read *req; |
1da177e4 LT |
419 | struct page *page; |
420 | unsigned blkoff, limit; | |
421 | int ret; | |
422 | ||
1bbae9f8 | 423 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 424 | |
08e0e7c8 | 425 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
426 | _leave(" = -ESTALE"); |
427 | return -ESTALE; | |
428 | } | |
429 | ||
f3ddee8d DH |
430 | req = afs_read_dir(dvnode, key); |
431 | if (IS_ERR(req)) | |
432 | return PTR_ERR(req); | |
433 | ||
1da177e4 | 434 | /* round the file position up to the next entry boundary */ |
00317636 DH |
435 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
436 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
437 | |
438 | /* walk through the blocks in sequence */ | |
439 | ret = 0; | |
f3ddee8d | 440 | while (ctx->pos < req->actual_len) { |
00317636 | 441 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 442 | |
f3ddee8d DH |
443 | /* Fetch the appropriate page from the directory and re-add it |
444 | * to the LRU. | |
445 | */ | |
446 | page = req->pages[blkoff / PAGE_SIZE]; | |
447 | if (!page) { | |
448 | ret = -EIO; | |
1da177e4 LT |
449 | break; |
450 | } | |
f3ddee8d | 451 | mark_page_accessed(page); |
1da177e4 LT |
452 | |
453 | limit = blkoff & ~(PAGE_SIZE - 1); | |
454 | ||
f3ddee8d | 455 | dbuf = kmap(page); |
1da177e4 LT |
456 | |
457 | /* deal with the individual blocks stashed on this page */ | |
458 | do { | |
459 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 460 | sizeof(union afs_xdr_dir_block)]; |
1bbae9f8 | 461 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 | 462 | if (ret != 1) { |
f3ddee8d | 463 | kunmap(page); |
1da177e4 LT |
464 | goto out; |
465 | } | |
466 | ||
00317636 | 467 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 468 | |
1bbae9f8 | 469 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 470 | |
f3ddee8d | 471 | kunmap(page); |
1da177e4 LT |
472 | ret = 0; |
473 | } | |
474 | ||
ec26815a | 475 | out: |
f3ddee8d | 476 | afs_put_read(req); |
1da177e4 LT |
477 | _leave(" = %d", ret); |
478 | return ret; | |
ec26815a | 479 | } |
1da177e4 | 480 | |
1da177e4 LT |
481 | /* |
482 | * read an AFS directory | |
483 | */ | |
1bbae9f8 | 484 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 485 | { |
215804a9 | 486 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 487 | } |
1da177e4 | 488 | |
1da177e4 | 489 | /* |
5cf9dd55 | 490 | * Search the directory for a single name |
1da177e4 LT |
491 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
492 | * uniquifier through dtype | |
493 | */ | |
5cf9dd55 DH |
494 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
495 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 496 | { |
5cf9dd55 DH |
497 | struct afs_lookup_one_cookie *cookie = |
498 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 499 | |
1bbae9f8 AV |
500 | _enter("{%s,%u},%s,%u,,%llu,%u", |
501 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 502 | (unsigned long long) ino, dtype); |
1da177e4 | 503 | |
08e0e7c8 | 504 | /* insanity checks first */ |
00317636 DH |
505 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
506 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 507 | |
1bbae9f8 AV |
508 | if (cookie->name.len != nlen || |
509 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
510 | _leave(" = 0 [no]"); |
511 | return 0; | |
512 | } | |
513 | ||
514 | cookie->fid.vnode = ino; | |
515 | cookie->fid.unique = dtype; | |
516 | cookie->found = 1; | |
517 | ||
518 | _leave(" = -1 [found]"); | |
519 | return -1; | |
ec26815a | 520 | } |
1da177e4 | 521 | |
1da177e4 | 522 | /* |
5cf9dd55 | 523 | * Do a lookup of a single name in a directory |
260a9803 | 524 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 525 | */ |
5cf9dd55 DH |
526 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
527 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 528 | { |
1bbae9f8 | 529 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
530 | struct afs_lookup_one_cookie cookie = { |
531 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
532 | .name = dentry->d_name, |
533 | .fid.vid = as->volume->vid | |
534 | }; | |
1da177e4 LT |
535 | int ret; |
536 | ||
a455589f | 537 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 538 | |
1da177e4 | 539 | /* search the directory */ |
1bbae9f8 | 540 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 541 | if (ret < 0) { |
08e0e7c8 DH |
542 | _leave(" = %d [iter]", ret); |
543 | return ret; | |
1da177e4 LT |
544 | } |
545 | ||
546 | ret = -ENOENT; | |
547 | if (!cookie.found) { | |
08e0e7c8 DH |
548 | _leave(" = -ENOENT [not found]"); |
549 | return -ENOENT; | |
1da177e4 LT |
550 | } |
551 | ||
08e0e7c8 DH |
552 | *fid = cookie.fid; |
553 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
554 | return 0; | |
555 | } | |
556 | ||
5cf9dd55 DH |
557 | /* |
558 | * search the directory for a name | |
559 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
560 | * uniquifier through dtype | |
561 | */ | |
562 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
563 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
564 | { | |
565 | struct afs_lookup_cookie *cookie = | |
566 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
567 | int ret; | |
568 | ||
569 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
570 | cookie->name.name, cookie->name.len, name, nlen, | |
571 | (unsigned long long) ino, dtype); | |
572 | ||
573 | /* insanity checks first */ | |
00317636 DH |
574 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
575 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
576 | |
577 | if (cookie->found) { | |
578 | if (cookie->nr_fids < 50) { | |
579 | cookie->fids[cookie->nr_fids].vnode = ino; | |
580 | cookie->fids[cookie->nr_fids].unique = dtype; | |
581 | cookie->nr_fids++; | |
582 | } | |
583 | } else if (cookie->name.len == nlen && | |
584 | memcmp(cookie->name.name, name, nlen) == 0) { | |
585 | cookie->fids[0].vnode = ino; | |
586 | cookie->fids[0].unique = dtype; | |
587 | cookie->found = 1; | |
588 | if (cookie->one_only) | |
589 | return -1; | |
590 | } | |
591 | ||
592 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
593 | _leave(" = %d", ret); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
599 | * files in one go and create inodes for them. The inode of the file we were | |
600 | * asked for is returned. | |
601 | */ | |
602 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
603 | struct key *key) | |
604 | { | |
605 | struct afs_lookup_cookie *cookie; | |
606 | struct afs_cb_interest *cbi = NULL; | |
607 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
608 | struct afs_iget_data data; | |
609 | struct afs_fs_cursor fc; | |
610 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
611 | struct inode *inode = NULL; | |
612 | int ret, i; | |
613 | ||
614 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
615 | ||
616 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
617 | if (!cookie) | |
618 | return ERR_PTR(-ENOMEM); | |
619 | ||
620 | cookie->ctx.actor = afs_lookup_filldir; | |
621 | cookie->name = dentry->d_name; | |
622 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
623 | ||
624 | read_seqlock_excl(&dvnode->cb_lock); | |
625 | if (dvnode->cb_interest && | |
626 | dvnode->cb_interest->server && | |
627 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
628 | cookie->one_only = true; | |
629 | read_sequnlock_excl(&dvnode->cb_lock); | |
630 | ||
631 | for (i = 0; i < 50; i++) | |
632 | cookie->fids[i].vid = as->volume->vid; | |
633 | ||
634 | /* search the directory */ | |
635 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
636 | if (ret < 0) { | |
637 | inode = ERR_PTR(ret); | |
638 | goto out; | |
639 | } | |
640 | ||
641 | inode = ERR_PTR(-ENOENT); | |
642 | if (!cookie->found) | |
643 | goto out; | |
644 | ||
645 | /* Check to see if we already have an inode for the primary fid. */ | |
646 | data.volume = dvnode->volume; | |
647 | data.fid = cookie->fids[0]; | |
648 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
649 | if (inode) | |
650 | goto out; | |
651 | ||
652 | /* Need space for examining all the selected files */ | |
653 | inode = ERR_PTR(-ENOMEM); | |
654 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
655 | GFP_KERNEL); | |
656 | if (!cookie->statuses) | |
657 | goto out; | |
658 | ||
659 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
660 | GFP_KERNEL); | |
661 | if (!cookie->callbacks) | |
662 | goto out_s; | |
663 | ||
664 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
665 | * lookups contained therein are stored in the reply without aborting | |
666 | * the whole operation. | |
667 | */ | |
668 | if (cookie->one_only) | |
669 | goto no_inline_bulk_status; | |
670 | ||
671 | inode = ERR_PTR(-ERESTARTSYS); | |
672 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
673 | while (afs_select_fileserver(&fc)) { | |
674 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
675 | &fc.cbi->server->flags)) { | |
676 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
677 | fc.ac.error = -ECONNABORTED; | |
678 | break; | |
679 | } | |
680 | afs_fs_inline_bulk_status(&fc, | |
681 | afs_v2net(dvnode), | |
682 | cookie->fids, | |
683 | cookie->statuses, | |
684 | cookie->callbacks, | |
685 | cookie->nr_fids, NULL); | |
686 | } | |
687 | ||
688 | if (fc.ac.error == 0) | |
689 | cbi = afs_get_cb_interest(fc.cbi); | |
690 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
691 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
692 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
693 | } | |
694 | ||
695 | if (!IS_ERR(inode)) | |
696 | goto success; | |
697 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
698 | goto out_c; | |
699 | ||
700 | no_inline_bulk_status: | |
701 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
702 | * any of the lookups fails - so, for the moment, revert to | |
703 | * FS.FetchStatus for just the primary fid. | |
704 | */ | |
705 | cookie->nr_fids = 1; | |
706 | inode = ERR_PTR(-ERESTARTSYS); | |
707 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
708 | while (afs_select_fileserver(&fc)) { | |
709 | afs_fs_fetch_status(&fc, | |
710 | afs_v2net(dvnode), | |
711 | cookie->fids, | |
712 | cookie->statuses, | |
713 | cookie->callbacks, | |
714 | NULL); | |
715 | } | |
716 | ||
717 | if (fc.ac.error == 0) | |
718 | cbi = afs_get_cb_interest(fc.cbi); | |
719 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
720 | } | |
721 | ||
722 | if (IS_ERR(inode)) | |
723 | goto out_c; | |
724 | ||
725 | for (i = 0; i < cookie->nr_fids; i++) | |
726 | cookie->statuses[i].abort_code = 0; | |
727 | ||
728 | success: | |
729 | /* Turn all the files into inodes and save the first one - which is the | |
730 | * one we actually want. | |
731 | */ | |
732 | if (cookie->statuses[0].abort_code != 0) | |
733 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
734 | ||
735 | for (i = 0; i < cookie->nr_fids; i++) { | |
736 | struct inode *ti; | |
737 | ||
738 | if (cookie->statuses[i].abort_code != 0) | |
739 | continue; | |
740 | ||
741 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
742 | &cookie->statuses[i], | |
743 | &cookie->callbacks[i], | |
744 | cbi); | |
745 | if (i == 0) { | |
746 | inode = ti; | |
747 | } else { | |
748 | if (!IS_ERR(ti)) | |
749 | iput(ti); | |
750 | } | |
751 | } | |
752 | ||
753 | out_c: | |
754 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
755 | kfree(cookie->callbacks); | |
756 | out_s: | |
757 | kfree(cookie->statuses); | |
758 | out: | |
759 | kfree(cookie); | |
760 | return inode; | |
761 | } | |
762 | ||
6f8880d8 DH |
763 | /* |
764 | * Look up an entry in a directory with @sys substitution. | |
765 | */ | |
766 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
767 | struct key *key) | |
768 | { | |
769 | struct afs_sysnames *subs; | |
770 | struct afs_net *net = afs_i2net(dir); | |
771 | struct dentry *ret; | |
772 | char *buf, *p, *name; | |
773 | int len, i; | |
774 | ||
775 | _enter(""); | |
776 | ||
777 | ret = ERR_PTR(-ENOMEM); | |
778 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
779 | if (!buf) | |
780 | goto out_p; | |
781 | if (dentry->d_name.len > 4) { | |
782 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
783 | p += dentry->d_name.len - 4; | |
784 | } | |
785 | ||
786 | /* There is an ordered list of substitutes that we have to try. */ | |
787 | read_lock(&net->sysnames_lock); | |
788 | subs = net->sysnames; | |
789 | refcount_inc(&subs->usage); | |
790 | read_unlock(&net->sysnames_lock); | |
791 | ||
792 | for (i = 0; i < subs->nr; i++) { | |
793 | name = subs->subs[i]; | |
794 | len = dentry->d_name.len - 4 + strlen(name); | |
795 | if (len >= AFSNAMEMAX) { | |
796 | ret = ERR_PTR(-ENAMETOOLONG); | |
797 | goto out_s; | |
798 | } | |
799 | ||
800 | strcpy(p, name); | |
801 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
802 | if (IS_ERR(ret) || d_is_positive(ret)) | |
803 | goto out_s; | |
804 | dput(ret); | |
805 | } | |
806 | ||
807 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
808 | * the cached dentry to hide changes to the sysnames list. | |
809 | */ | |
810 | ret = NULL; | |
811 | out_s: | |
812 | afs_put_sysnames(subs); | |
813 | kfree(buf); | |
814 | out_p: | |
815 | key_put(key); | |
816 | return ret; | |
817 | } | |
818 | ||
08e0e7c8 DH |
819 | /* |
820 | * look up an entry in a directory | |
821 | */ | |
260a9803 | 822 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 823 | unsigned int flags) |
08e0e7c8 | 824 | { |
5cf9dd55 | 825 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 826 | struct inode *inode; |
00d3b7a4 | 827 | struct key *key; |
08e0e7c8 DH |
828 | int ret; |
829 | ||
a455589f | 830 | _enter("{%x:%u},%p{%pd},", |
5cf9dd55 | 831 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 832 | |
2b0143b5 | 833 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 834 | |
45222b9e | 835 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
836 | _leave(" = -ENAMETOOLONG"); |
837 | return ERR_PTR(-ENAMETOOLONG); | |
838 | } | |
839 | ||
5cf9dd55 | 840 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
841 | _leave(" = -ESTALE"); |
842 | return ERR_PTR(-ESTALE); | |
843 | } | |
844 | ||
5cf9dd55 | 845 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
846 | if (IS_ERR(key)) { |
847 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 848 | return ERR_CAST(key); |
00d3b7a4 DH |
849 | } |
850 | ||
5cf9dd55 | 851 | ret = afs_validate(dvnode, key); |
260a9803 DH |
852 | if (ret < 0) { |
853 | key_put(key); | |
854 | _leave(" = %d [val]", ret); | |
855 | return ERR_PTR(ret); | |
856 | } | |
857 | ||
6f8880d8 DH |
858 | if (dentry->d_name.len >= 4 && |
859 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
860 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
861 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
862 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
863 | return afs_lookup_atsys(dir, dentry, key); | |
864 | ||
d55b4da4 | 865 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 DH |
866 | inode = afs_do_lookup(dir, dentry, key); |
867 | if (IS_ERR(inode)) { | |
868 | ret = PTR_ERR(inode); | |
4d673da1 | 869 | if (ret == -ENOENT) { |
5cf9dd55 | 870 | inode = afs_try_auto_mntpt(dentry, dir); |
4d673da1 DH |
871 | if (!IS_ERR(inode)) { |
872 | key_put(key); | |
873 | goto success; | |
874 | } | |
875 | ||
876 | ret = PTR_ERR(inode); | |
bec5eb61 | 877 | } |
878 | ||
00d3b7a4 | 879 | key_put(key); |
260a9803 DH |
880 | if (ret == -ENOENT) { |
881 | d_add(dentry, NULL); | |
882 | _leave(" = NULL [negative]"); | |
883 | return NULL; | |
884 | } | |
08e0e7c8 | 885 | _leave(" = %d [do]", ret); |
1da177e4 LT |
886 | return ERR_PTR(ret); |
887 | } | |
5cf9dd55 | 888 | dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; |
1da177e4 | 889 | |
08e0e7c8 | 890 | /* instantiate the dentry */ |
00d3b7a4 | 891 | key_put(key); |
08e0e7c8 DH |
892 | if (IS_ERR(inode)) { |
893 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 894 | return ERR_CAST(inode); |
08e0e7c8 DH |
895 | } |
896 | ||
bec5eb61 | 897 | success: |
1da177e4 | 898 | d_add(dentry, inode); |
5cf9dd55 | 899 | _leave(" = 0 { ino=%lu v=%u }", |
2b0143b5 DH |
900 | d_inode(dentry)->i_ino, |
901 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
902 | |
903 | return NULL; | |
ec26815a | 904 | } |
1da177e4 | 905 | |
1da177e4 LT |
906 | /* |
907 | * check that a dentry lookup hit has found a valid entry | |
908 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
909 | * inode | |
1da177e4 | 910 | */ |
0b728e19 | 911 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 912 | { |
260a9803 | 913 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 914 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 915 | struct dentry *parent; |
c435ee34 | 916 | struct inode *inode; |
00d3b7a4 | 917 | struct key *key; |
a4ff7401 | 918 | long dir_version, de_version; |
1da177e4 LT |
919 | int ret; |
920 | ||
0b728e19 | 921 | if (flags & LOOKUP_RCU) |
34286d66 NP |
922 | return -ECHILD; |
923 | ||
c435ee34 DH |
924 | if (d_really_is_positive(dentry)) { |
925 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
926 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
927 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 928 | vnode->flags); |
c435ee34 | 929 | } else { |
a455589f | 930 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 931 | } |
1da177e4 | 932 | |
260a9803 | 933 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
934 | if (IS_ERR(key)) |
935 | key = NULL; | |
936 | ||
c435ee34 DH |
937 | if (d_really_is_positive(dentry)) { |
938 | inode = d_inode(dentry); | |
939 | if (inode) { | |
940 | vnode = AFS_FS_I(inode); | |
941 | afs_validate(vnode, key); | |
942 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
943 | goto out_bad; | |
944 | } | |
945 | } | |
946 | ||
1da177e4 | 947 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 948 | parent = dget_parent(dentry); |
2b0143b5 | 949 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 950 | |
260a9803 | 951 | /* validate the parent directory */ |
c435ee34 | 952 | afs_validate(dir, key); |
260a9803 DH |
953 | |
954 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 955 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 956 | goto out_bad_parent; |
1da177e4 LT |
957 | } |
958 | ||
a4ff7401 DH |
959 | /* We only need to invalidate a dentry if the server's copy changed |
960 | * behind our back. If we made the change, it's no problem. Note that | |
961 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
962 | * version. | |
963 | */ | |
964 | dir_version = (long)dir->status.data_version; | |
965 | de_version = (long)dentry->d_fsdata; | |
966 | if (de_version == dir_version) | |
967 | goto out_valid; | |
968 | ||
969 | dir_version = (long)dir->invalid_before; | |
970 | if (de_version - dir_version >= 0) | |
971 | goto out_valid; | |
1da177e4 | 972 | |
260a9803 | 973 | _debug("dir modified"); |
d55b4da4 | 974 | afs_stat_v(dir, n_reval); |
260a9803 DH |
975 | |
976 | /* search the directory for this vnode */ | |
5cf9dd55 | 977 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
978 | switch (ret) { |
979 | case 0: | |
980 | /* the filename maps to something */ | |
2b0143b5 | 981 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
982 | goto out_bad_parent; |
983 | inode = d_inode(dentry); | |
984 | if (is_bad_inode(inode)) { | |
a455589f AV |
985 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
986 | dentry); | |
c435ee34 | 987 | goto out_bad_parent; |
1da177e4 LT |
988 | } |
989 | ||
c435ee34 DH |
990 | vnode = AFS_FS_I(inode); |
991 | ||
1da177e4 LT |
992 | /* if the vnode ID has changed, then the dirent points to a |
993 | * different file */ | |
08e0e7c8 | 994 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
995 | _debug("%pd: dirent changed [%u != %u]", |
996 | dentry, fid.vnode, | |
08e0e7c8 | 997 | vnode->fid.vnode); |
1da177e4 LT |
998 | goto not_found; |
999 | } | |
1000 | ||
1001 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1002 | * been deleted and replaced, and the original vnode ID has |
1003 | * been reused */ | |
08e0e7c8 | 1004 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1005 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1006 | dentry, fid.unique, | |
7a224228 | 1007 | vnode->fid.unique, |
c435ee34 DH |
1008 | vnode->vfs_inode.i_generation); |
1009 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1010 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1011 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1012 | goto not_found; |
1da177e4 | 1013 | } |
260a9803 | 1014 | goto out_valid; |
08e0e7c8 | 1015 | |
260a9803 DH |
1016 | case -ENOENT: |
1017 | /* the filename is unknown */ | |
a455589f | 1018 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1019 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1020 | goto not_found; |
1021 | goto out_valid; | |
1da177e4 | 1022 | |
260a9803 | 1023 | default: |
a455589f AV |
1024 | _debug("failed to iterate dir %pd: %d", |
1025 | parent, ret); | |
c435ee34 | 1026 | goto out_bad_parent; |
08e0e7c8 DH |
1027 | } |
1028 | ||
ec26815a | 1029 | out_valid: |
a4ff7401 | 1030 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1031 | dput(parent); |
00d3b7a4 | 1032 | key_put(key); |
1da177e4 LT |
1033 | _leave(" = 1 [valid]"); |
1034 | return 1; | |
1035 | ||
1036 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1037 | not_found: |
1da177e4 LT |
1038 | spin_lock(&dentry->d_lock); |
1039 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1040 | spin_unlock(&dentry->d_lock); | |
1041 | ||
c435ee34 | 1042 | out_bad_parent: |
a455589f | 1043 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1044 | dput(parent); |
c435ee34 | 1045 | out_bad: |
00d3b7a4 | 1046 | key_put(key); |
1da177e4 LT |
1047 | |
1048 | _leave(" = 0 [bad]"); | |
1049 | return 0; | |
ec26815a | 1050 | } |
1da177e4 | 1051 | |
1da177e4 LT |
1052 | /* |
1053 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1054 | * sleep) | |
1055 | * - called from dput() when d_count is going to 0. | |
1056 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1057 | */ | |
fe15ce44 | 1058 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1059 | { |
a455589f | 1060 | _enter("%pd", dentry); |
1da177e4 LT |
1061 | |
1062 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1063 | goto zap; | |
1064 | ||
2b0143b5 DH |
1065 | if (d_really_is_positive(dentry) && |
1066 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1067 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1068 | goto zap; |
1da177e4 LT |
1069 | |
1070 | _leave(" = 0 [keep]"); | |
1071 | return 0; | |
1072 | ||
ec26815a | 1073 | zap: |
1da177e4 LT |
1074 | _leave(" = 1 [zap]"); |
1075 | return 1; | |
ec26815a | 1076 | } |
260a9803 DH |
1077 | |
1078 | /* | |
1079 | * handle dentry release | |
1080 | */ | |
66c7e1d3 | 1081 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1082 | { |
a455589f | 1083 | _enter("%pd", dentry); |
260a9803 DH |
1084 | } |
1085 | ||
d2ddc776 DH |
1086 | /* |
1087 | * Create a new inode for create/mkdir/symlink | |
1088 | */ | |
1089 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1090 | struct dentry *new_dentry, | |
1091 | struct afs_fid *newfid, | |
1092 | struct afs_file_status *newstatus, | |
1093 | struct afs_callback *newcb) | |
1094 | { | |
5a813276 | 1095 | struct afs_vnode *vnode; |
d2ddc776 DH |
1096 | struct inode *inode; |
1097 | ||
1098 | if (fc->ac.error < 0) | |
1099 | return; | |
1100 | ||
bc1527dc DH |
1101 | d_drop(new_dentry); |
1102 | ||
d2ddc776 DH |
1103 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
1104 | newfid, newstatus, newcb, fc->cbi); | |
1105 | if (IS_ERR(inode)) { | |
1106 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1107 | * the new directory on the server. | |
1108 | */ | |
1109 | fc->ac.error = PTR_ERR(inode); | |
1110 | return; | |
1111 | } | |
1112 | ||
5a813276 DH |
1113 | vnode = AFS_FS_I(inode); |
1114 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
bc1527dc | 1115 | d_add(new_dentry, inode); |
d2ddc776 DH |
1116 | } |
1117 | ||
260a9803 DH |
1118 | /* |
1119 | * create a directory on an AFS filesystem | |
1120 | */ | |
18bb1db3 | 1121 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1122 | { |
d2ddc776 DH |
1123 | struct afs_file_status newstatus; |
1124 | struct afs_fs_cursor fc; | |
1125 | struct afs_callback newcb; | |
1126 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1127 | struct afs_fid newfid; | |
260a9803 | 1128 | struct key *key; |
63a4681f | 1129 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1130 | int ret; |
1131 | ||
d2ddc776 | 1132 | mode |= S_IFDIR; |
260a9803 | 1133 | |
a455589f AV |
1134 | _enter("{%x:%u},{%pd},%ho", |
1135 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1136 | |
260a9803 DH |
1137 | key = afs_request_key(dvnode->volume->cell); |
1138 | if (IS_ERR(key)) { | |
1139 | ret = PTR_ERR(key); | |
1140 | goto error; | |
1141 | } | |
1142 | ||
d2ddc776 DH |
1143 | ret = -ERESTARTSYS; |
1144 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1145 | while (afs_select_fileserver(&fc)) { | |
1146 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
63a4681f | 1147 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1148 | &newfid, &newstatus, &newcb); |
1149 | } | |
260a9803 | 1150 | |
d2ddc776 DH |
1151 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1152 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1153 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1154 | ret = afs_end_vnode_operation(&fc); | |
1155 | if (ret < 0) | |
1156 | goto error_key; | |
4433b691 DH |
1157 | } else { |
1158 | goto error_key; | |
260a9803 DH |
1159 | } |
1160 | ||
63a4681f DH |
1161 | if (ret == 0 && |
1162 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1163 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1164 | afs_edit_dir_for_create); | |
1165 | ||
260a9803 DH |
1166 | key_put(key); |
1167 | _leave(" = 0"); | |
1168 | return 0; | |
1169 | ||
d2ddc776 | 1170 | error_key: |
260a9803 DH |
1171 | key_put(key); |
1172 | error: | |
1173 | d_drop(dentry); | |
1174 | _leave(" = %d", ret); | |
1175 | return ret; | |
1176 | } | |
1177 | ||
d2ddc776 DH |
1178 | /* |
1179 | * Remove a subdir from a directory. | |
1180 | */ | |
1181 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1182 | { | |
1183 | if (d_really_is_positive(dentry)) { | |
1184 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1185 | ||
1186 | clear_nlink(&vnode->vfs_inode); | |
1187 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1188 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1189 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1190 | } |
1191 | } | |
1192 | ||
260a9803 DH |
1193 | /* |
1194 | * remove a directory from an AFS filesystem | |
1195 | */ | |
1196 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1197 | { | |
d2ddc776 DH |
1198 | struct afs_fs_cursor fc; |
1199 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 | 1200 | struct key *key; |
63a4681f | 1201 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1202 | int ret; |
1203 | ||
a455589f AV |
1204 | _enter("{%x:%u},{%pd}", |
1205 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1206 | |
260a9803 DH |
1207 | key = afs_request_key(dvnode->volume->cell); |
1208 | if (IS_ERR(key)) { | |
1209 | ret = PTR_ERR(key); | |
1210 | goto error; | |
1211 | } | |
1212 | ||
d2ddc776 DH |
1213 | ret = -ERESTARTSYS; |
1214 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1215 | while (afs_select_fileserver(&fc)) { | |
1216 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
63a4681f DH |
1217 | afs_fs_remove(&fc, dentry->d_name.name, true, |
1218 | data_version); | |
d2ddc776 | 1219 | } |
260a9803 | 1220 | |
d2ddc776 DH |
1221 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1222 | ret = afs_end_vnode_operation(&fc); | |
63a4681f | 1223 | if (ret == 0) { |
d2ddc776 | 1224 | afs_dir_remove_subdir(dentry); |
63a4681f DH |
1225 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1226 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1227 | afs_edit_dir_for_rmdir); | |
1228 | } | |
260a9803 DH |
1229 | } |
1230 | ||
1231 | key_put(key); | |
260a9803 | 1232 | error: |
260a9803 DH |
1233 | return ret; |
1234 | } | |
1235 | ||
1236 | /* | |
d2ddc776 DH |
1237 | * Remove a link to a file or symlink from a directory. |
1238 | * | |
1239 | * If the file was not deleted due to excess hard links, the fileserver will | |
1240 | * break the callback promise on the file - if it had one - before it returns | |
1241 | * to us, and if it was deleted, it won't | |
1242 | * | |
1243 | * However, if we didn't have a callback promise outstanding, or it was | |
1244 | * outstanding on a different server, then it won't break it either... | |
1245 | */ | |
440fbc3a DH |
1246 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1247 | unsigned long d_version_before, | |
1248 | unsigned long d_version_after) | |
d2ddc776 | 1249 | { |
440fbc3a | 1250 | bool dir_valid; |
d2ddc776 DH |
1251 | int ret = 0; |
1252 | ||
440fbc3a DH |
1253 | /* There were no intervening changes on the server if the version |
1254 | * number we got back was incremented by exactly 1. | |
1255 | */ | |
1256 | dir_valid = (d_version_after == d_version_before + 1); | |
1257 | ||
d2ddc776 DH |
1258 | if (d_really_is_positive(dentry)) { |
1259 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1260 | ||
440fbc3a DH |
1261 | if (dir_valid) { |
1262 | drop_nlink(&vnode->vfs_inode); | |
1263 | if (vnode->vfs_inode.i_nlink == 0) { | |
1264 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1265 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1266 | } | |
d2ddc776 | 1267 | ret = 0; |
440fbc3a DH |
1268 | } else { |
1269 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1270 | ||
1271 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1272 | kdebug("AFS_VNODE_DELETED"); | |
1273 | ||
1274 | ret = afs_validate(vnode, key); | |
1275 | if (ret == -ESTALE) | |
1276 | ret = 0; | |
1277 | } | |
d2ddc776 DH |
1278 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1279 | } | |
1280 | ||
1281 | return ret; | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1286 | */ |
1287 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1288 | { | |
d2ddc776 DH |
1289 | struct afs_fs_cursor fc; |
1290 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 | 1291 | struct key *key; |
440fbc3a | 1292 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
63a4681f | 1293 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1294 | int ret; |
1295 | ||
a455589f AV |
1296 | _enter("{%x:%u},{%pd}", |
1297 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1298 | |
45222b9e | 1299 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1300 | return -ENAMETOOLONG; |
260a9803 DH |
1301 | |
1302 | key = afs_request_key(dvnode->volume->cell); | |
1303 | if (IS_ERR(key)) { | |
1304 | ret = PTR_ERR(key); | |
1305 | goto error; | |
1306 | } | |
1307 | ||
d2ddc776 | 1308 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1309 | if (d_really_is_positive(dentry)) { |
1310 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1311 | ret = afs_validate(vnode, key); |
1312 | if (ret < 0) | |
d2ddc776 | 1313 | goto error_key; |
260a9803 DH |
1314 | } |
1315 | ||
d2ddc776 DH |
1316 | ret = -ERESTARTSYS; |
1317 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1318 | while (afs_select_fileserver(&fc)) { | |
1319 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
63a4681f DH |
1320 | afs_fs_remove(&fc, dentry->d_name.name, false, |
1321 | data_version); | |
d2ddc776 | 1322 | } |
260a9803 | 1323 | |
d2ddc776 DH |
1324 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1325 | ret = afs_end_vnode_operation(&fc); | |
1326 | if (ret == 0) | |
440fbc3a DH |
1327 | ret = afs_dir_remove_link( |
1328 | dentry, key, d_version, | |
1329 | (unsigned long)dvnode->status.data_version); | |
63a4681f DH |
1330 | if (ret == 0 && |
1331 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1332 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1333 | afs_edit_dir_for_unlink); | |
260a9803 DH |
1334 | } |
1335 | ||
d2ddc776 | 1336 | error_key: |
260a9803 DH |
1337 | key_put(key); |
1338 | error: | |
1339 | _leave(" = %d", ret); | |
1340 | return ret; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * create a regular file on an AFS filesystem | |
1345 | */ | |
4acdaf27 | 1346 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1347 | bool excl) |
260a9803 | 1348 | { |
d2ddc776 DH |
1349 | struct afs_fs_cursor fc; |
1350 | struct afs_file_status newstatus; | |
1351 | struct afs_callback newcb; | |
43dd388b | 1352 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1353 | struct afs_fid newfid; |
260a9803 | 1354 | struct key *key; |
63a4681f | 1355 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1356 | int ret; |
1357 | ||
d2ddc776 | 1358 | mode |= S_IFREG; |
260a9803 | 1359 | |
a455589f AV |
1360 | _enter("{%x:%u},{%pd},%ho,", |
1361 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1362 | |
d2ddc776 DH |
1363 | ret = -ENAMETOOLONG; |
1364 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1365 | goto error; | |
1366 | ||
260a9803 DH |
1367 | key = afs_request_key(dvnode->volume->cell); |
1368 | if (IS_ERR(key)) { | |
1369 | ret = PTR_ERR(key); | |
1370 | goto error; | |
1371 | } | |
1372 | ||
d2ddc776 DH |
1373 | ret = -ERESTARTSYS; |
1374 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1375 | while (afs_select_fileserver(&fc)) { | |
1376 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
63a4681f | 1377 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1378 | &newfid, &newstatus, &newcb); |
1379 | } | |
260a9803 | 1380 | |
d2ddc776 DH |
1381 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1382 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1383 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1384 | ret = afs_end_vnode_operation(&fc); | |
1385 | if (ret < 0) | |
1386 | goto error_key; | |
4433b691 DH |
1387 | } else { |
1388 | goto error_key; | |
260a9803 DH |
1389 | } |
1390 | ||
63a4681f DH |
1391 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1392 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1393 | afs_edit_dir_for_create); | |
1394 | ||
260a9803 DH |
1395 | key_put(key); |
1396 | _leave(" = 0"); | |
1397 | return 0; | |
1398 | ||
d2ddc776 | 1399 | error_key: |
260a9803 DH |
1400 | key_put(key); |
1401 | error: | |
1402 | d_drop(dentry); | |
1403 | _leave(" = %d", ret); | |
1404 | return ret; | |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * create a hard link between files in an AFS filesystem | |
1409 | */ | |
1410 | static int afs_link(struct dentry *from, struct inode *dir, | |
1411 | struct dentry *dentry) | |
1412 | { | |
d2ddc776 | 1413 | struct afs_fs_cursor fc; |
260a9803 DH |
1414 | struct afs_vnode *dvnode, *vnode; |
1415 | struct key *key; | |
63a4681f | 1416 | u64 data_version; |
260a9803 DH |
1417 | int ret; |
1418 | ||
2b0143b5 | 1419 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 | 1420 | dvnode = AFS_FS_I(dir); |
63a4681f | 1421 | data_version = dvnode->status.data_version; |
260a9803 | 1422 | |
a455589f | 1423 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1424 | vnode->fid.vid, vnode->fid.vnode, |
1425 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1426 | dentry); |
260a9803 | 1427 | |
d2ddc776 DH |
1428 | ret = -ENAMETOOLONG; |
1429 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1430 | goto error; | |
1431 | ||
260a9803 DH |
1432 | key = afs_request_key(dvnode->volume->cell); |
1433 | if (IS_ERR(key)) { | |
1434 | ret = PTR_ERR(key); | |
1435 | goto error; | |
1436 | } | |
1437 | ||
d2ddc776 DH |
1438 | ret = -ERESTARTSYS; |
1439 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1440 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1441 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1442 | goto error_key; |
d2ddc776 DH |
1443 | } |
1444 | ||
1445 | while (afs_select_fileserver(&fc)) { | |
1446 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1447 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
63a4681f | 1448 | afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); |
d2ddc776 DH |
1449 | } |
1450 | ||
1451 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1452 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1453 | ihold(&vnode->vfs_inode); | |
1454 | d_instantiate(dentry, &vnode->vfs_inode); | |
1455 | ||
1456 | mutex_unlock(&vnode->io_lock); | |
1457 | ret = afs_end_vnode_operation(&fc); | |
1458 | if (ret < 0) | |
1459 | goto error_key; | |
4433b691 DH |
1460 | } else { |
1461 | goto error_key; | |
d2ddc776 | 1462 | } |
260a9803 | 1463 | |
63a4681f DH |
1464 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1465 | afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, | |
1466 | afs_edit_dir_for_link); | |
1467 | ||
260a9803 DH |
1468 | key_put(key); |
1469 | _leave(" = 0"); | |
1470 | return 0; | |
1471 | ||
d2ddc776 | 1472 | error_key: |
260a9803 DH |
1473 | key_put(key); |
1474 | error: | |
1475 | d_drop(dentry); | |
1476 | _leave(" = %d", ret); | |
1477 | return ret; | |
1478 | } | |
1479 | ||
1480 | /* | |
1481 | * create a symlink in an AFS filesystem | |
1482 | */ | |
1483 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1484 | const char *content) | |
1485 | { | |
d2ddc776 DH |
1486 | struct afs_fs_cursor fc; |
1487 | struct afs_file_status newstatus; | |
1488 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1489 | struct afs_fid newfid; | |
260a9803 | 1490 | struct key *key; |
63a4681f | 1491 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1492 | int ret; |
1493 | ||
a455589f AV |
1494 | _enter("{%x:%u},{%pd},%s", |
1495 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1496 | content); |
1497 | ||
d2ddc776 DH |
1498 | ret = -ENAMETOOLONG; |
1499 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1500 | goto error; | |
1501 | ||
260a9803 | 1502 | ret = -EINVAL; |
45222b9e | 1503 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1504 | goto error; |
1505 | ||
1506 | key = afs_request_key(dvnode->volume->cell); | |
1507 | if (IS_ERR(key)) { | |
1508 | ret = PTR_ERR(key); | |
1509 | goto error; | |
1510 | } | |
1511 | ||
d2ddc776 DH |
1512 | ret = -ERESTARTSYS; |
1513 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1514 | while (afs_select_fileserver(&fc)) { | |
1515 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
63a4681f DH |
1516 | afs_fs_symlink(&fc, dentry->d_name.name, |
1517 | content, data_version, | |
d2ddc776 DH |
1518 | &newfid, &newstatus); |
1519 | } | |
260a9803 | 1520 | |
d2ddc776 DH |
1521 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1522 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1523 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1524 | ret = afs_end_vnode_operation(&fc); | |
1525 | if (ret < 0) | |
1526 | goto error_key; | |
4433b691 DH |
1527 | } else { |
1528 | goto error_key; | |
260a9803 DH |
1529 | } |
1530 | ||
63a4681f DH |
1531 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1532 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1533 | afs_edit_dir_for_symlink); | |
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; | |
63a4681f DH |
1557 | u64 orig_data_version, new_data_version; |
1558 | bool new_negative = d_is_negative(new_dentry); | |
260a9803 DH |
1559 | int ret; |
1560 | ||
1cd66c93 MS |
1561 | if (flags) |
1562 | return -EINVAL; | |
1563 | ||
2b0143b5 | 1564 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1565 | orig_dvnode = AFS_FS_I(old_dir); |
1566 | new_dvnode = AFS_FS_I(new_dir); | |
63a4681f DH |
1567 | orig_data_version = orig_dvnode->status.data_version; |
1568 | new_data_version = new_dvnode->status.data_version; | |
260a9803 | 1569 | |
a455589f | 1570 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1571 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1572 | vnode->fid.vid, vnode->fid.vnode, | |
1573 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1574 | new_dentry); |
260a9803 | 1575 | |
260a9803 DH |
1576 | key = afs_request_key(orig_dvnode->volume->cell); |
1577 | if (IS_ERR(key)) { | |
1578 | ret = PTR_ERR(key); | |
1579 | goto error; | |
1580 | } | |
1581 | ||
d2ddc776 DH |
1582 | ret = -ERESTARTSYS; |
1583 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1584 | if (orig_dvnode != new_dvnode) { | |
1585 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1586 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1587 | goto error_key; |
d2ddc776 DH |
1588 | } |
1589 | } | |
1590 | while (afs_select_fileserver(&fc)) { | |
1591 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1592 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1593 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
63a4681f DH |
1594 | new_dvnode, new_dentry->d_name.name, |
1595 | orig_data_version, new_data_version); | |
d2ddc776 DH |
1596 | } |
1597 | ||
1598 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1599 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1600 | if (orig_dvnode != new_dvnode) | |
1601 | mutex_unlock(&new_dvnode->io_lock); | |
1602 | ret = afs_end_vnode_operation(&fc); | |
1603 | if (ret < 0) | |
1604 | goto error_key; | |
1605 | } | |
1606 | ||
63a4681f DH |
1607 | if (ret == 0) { |
1608 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) | |
1609 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1610 | afs_edit_dir_for_rename); | |
1611 | ||
1612 | if (!new_negative && | |
1613 | test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1614 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1615 | afs_edit_dir_for_rename); | |
1616 | ||
1617 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1618 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1619 | &vnode->fid, afs_edit_dir_for_rename); | |
1620 | } | |
1621 | ||
d2ddc776 | 1622 | error_key: |
260a9803 DH |
1623 | key_put(key); |
1624 | error: | |
260a9803 DH |
1625 | _leave(" = %d", ret); |
1626 | return ret; | |
1627 | } | |
f3ddee8d DH |
1628 | |
1629 | /* | |
1630 | * Release a directory page and clean up its private state if it's not busy | |
1631 | * - return true if the page can now be released, false if not | |
1632 | */ | |
1633 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1634 | { | |
1635 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1636 | ||
1637 | _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); | |
1638 | ||
1639 | set_page_private(page, 0); | |
1640 | ClearPagePrivate(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_relpg); | |
1645 | return 1; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * invalidate part or all of a page | |
1650 | * - release a page and clean up its private data if offset is 0 (indicating | |
1651 | * the entire page) | |
1652 | */ | |
1653 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1654 | unsigned int length) | |
1655 | { | |
1656 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1657 | ||
1658 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1659 | ||
1660 | BUG_ON(!PageLocked(page)); | |
1661 | ||
1662 | /* The directory will need reloading. */ | |
1663 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1664 | afs_stat_v(dvnode, n_inval); | |
1665 | ||
1666 | /* we clean up only if the entire page is being invalidated */ | |
1667 | if (offset == 0 && length == PAGE_SIZE) { | |
1668 | set_page_private(page, 0); | |
1669 | ClearPagePrivate(page); | |
1670 | } | |
1671 | } |