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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); |
f51375cd | 141 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
142 | goto error; |
143 | } | |
63a4681f DH |
144 | |
145 | /* Make sure each block is NUL terminated so we can reasonably | |
146 | * use string functions on it. The filenames in the page | |
147 | * *should* be NUL-terminated anyway. | |
148 | */ | |
149 | ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; | |
1da177e4 LT |
150 | } |
151 | ||
63a4681f DH |
152 | kunmap(page); |
153 | ||
dab17c1a | 154 | checked: |
f3ddee8d | 155 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 156 | return true; |
1da177e4 | 157 | |
ec26815a | 158 | error: |
be5b82db | 159 | return false; |
ec26815a | 160 | } |
1da177e4 | 161 | |
1da177e4 LT |
162 | /* |
163 | * open an AFS directory file | |
164 | */ | |
165 | static int afs_dir_open(struct inode *inode, struct file *file) | |
166 | { | |
167 | _enter("{%lu}", inode->i_ino); | |
168 | ||
00317636 DH |
169 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
170 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 171 | |
08e0e7c8 | 172 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
173 | return -ENOENT; |
174 | ||
00d3b7a4 | 175 | return afs_open(inode, file); |
ec26815a | 176 | } |
1da177e4 | 177 | |
f3ddee8d DH |
178 | /* |
179 | * Read the directory into the pagecache in one go, scrubbing the previous | |
180 | * contents. The list of pages is returned, pinning them so that they don't | |
181 | * get reclaimed during the iteration. | |
182 | */ | |
183 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 184 | __acquires(&dvnode->validate_lock) |
f3ddee8d DH |
185 | { |
186 | struct afs_read *req; | |
187 | loff_t i_size; | |
188 | int nr_pages, nr_inline, i, n; | |
189 | int ret = -ENOMEM; | |
190 | ||
191 | retry: | |
192 | i_size = i_size_read(&dvnode->vfs_inode); | |
193 | if (i_size < 2048) | |
f51375cd DH |
194 | return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); |
195 | if (i_size > 2048 * 1024) { | |
196 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
f3ddee8d | 197 | return ERR_PTR(-EFBIG); |
f51375cd | 198 | } |
f3ddee8d DH |
199 | |
200 | _enter("%llu", i_size); | |
201 | ||
202 | /* Get a request record to hold the page list. We want to hold it | |
203 | * inline if we can, but we don't want to make an order 1 allocation. | |
204 | */ | |
205 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
206 | nr_inline = nr_pages; | |
207 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
208 | nr_inline = 0; | |
209 | ||
210 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
211 | GFP_KERNEL); | |
212 | if (!req) | |
213 | return ERR_PTR(-ENOMEM); | |
214 | ||
215 | refcount_set(&req->usage, 1); | |
216 | req->nr_pages = nr_pages; | |
217 | req->actual_len = i_size; /* May change */ | |
218 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
219 | req->data_version = dvnode->status.data_version; /* May change */ | |
220 | if (nr_inline > 0) { | |
221 | req->pages = req->array; | |
222 | } else { | |
223 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
224 | GFP_KERNEL); | |
225 | if (!req->pages) | |
226 | goto error; | |
227 | } | |
228 | ||
229 | /* Get a list of all the pages that hold or will hold the directory | |
230 | * content. We need to fill in any gaps that we might find where the | |
231 | * memory reclaimer has been at work. If there are any gaps, we will | |
232 | * need to reread the entire directory contents. | |
233 | */ | |
234 | i = 0; | |
235 | do { | |
236 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
237 | req->nr_pages - i, | |
238 | req->pages + i); | |
239 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
240 | if (n == 0) { | |
241 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
242 | ||
243 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
244 | afs_stat_v(dvnode, n_inval); | |
245 | ||
246 | ret = -ENOMEM; | |
247 | req->pages[i] = __page_cache_alloc(gfp); | |
248 | if (!req->pages[i]) | |
249 | goto error; | |
250 | ret = add_to_page_cache_lru(req->pages[i], | |
251 | dvnode->vfs_inode.i_mapping, | |
252 | i, gfp); | |
253 | if (ret < 0) | |
254 | goto error; | |
255 | ||
256 | set_page_private(req->pages[i], 1); | |
257 | SetPagePrivate(req->pages[i]); | |
258 | unlock_page(req->pages[i]); | |
259 | i++; | |
260 | } else { | |
261 | i += n; | |
262 | } | |
263 | } while (i < req->nr_pages); | |
264 | ||
265 | /* If we're going to reload, we need to lock all the pages to prevent | |
266 | * races. | |
267 | */ | |
b61f7dcf DH |
268 | ret = -ERESTARTSYS; |
269 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
270 | goto error; | |
f3ddee8d | 271 | |
b61f7dcf DH |
272 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
273 | goto success; | |
f3ddee8d | 274 | |
b61f7dcf DH |
275 | up_read(&dvnode->validate_lock); |
276 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
277 | goto error; | |
278 | ||
279 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
f3ddee8d DH |
280 | ret = afs_fetch_data(dvnode, key, req); |
281 | if (ret < 0) | |
b61f7dcf | 282 | goto error_unlock; |
f3ddee8d DH |
283 | |
284 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
285 | ||
286 | if (req->len < req->file_size) | |
287 | goto content_has_grown; | |
288 | ||
289 | /* Validate the data we just read. */ | |
290 | ret = -EIO; | |
291 | for (i = 0; i < req->nr_pages; i++) | |
292 | if (!afs_dir_check_page(dvnode, req->pages[i], | |
293 | req->actual_len)) | |
b61f7dcf | 294 | goto error_unlock; |
f3ddee8d DH |
295 | |
296 | // TODO: Trim excess pages | |
297 | ||
298 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
299 | } | |
300 | ||
b61f7dcf | 301 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 302 | success: |
f3ddee8d DH |
303 | return req; |
304 | ||
f3ddee8d | 305 | error_unlock: |
b61f7dcf | 306 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
307 | error: |
308 | afs_put_read(req); | |
309 | _leave(" = %d", ret); | |
310 | return ERR_PTR(ret); | |
311 | ||
312 | content_has_grown: | |
b61f7dcf | 313 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
314 | afs_put_read(req); |
315 | goto retry; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * deal with one block in an AFS directory | |
320 | */ | |
f51375cd DH |
321 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
322 | struct dir_context *ctx, | |
00317636 | 323 | union afs_xdr_dir_block *block, |
1bbae9f8 | 324 | unsigned blkoff) |
1da177e4 | 325 | { |
00317636 | 326 | union afs_xdr_dirent *dire; |
1da177e4 LT |
327 | unsigned offset, next, curr; |
328 | size_t nlen; | |
1bbae9f8 | 329 | int tmp; |
1da177e4 | 330 | |
1bbae9f8 | 331 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 332 | |
00317636 | 333 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
334 | |
335 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
336 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
337 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
338 | offset = next |
339 | ) { | |
340 | next = offset + 1; | |
341 | ||
342 | /* skip entries marked unused in the bitmap */ | |
00317636 | 343 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 344 | (1 << (offset % 8)))) { |
5b5e0928 | 345 | _debug("ENT[%zu.%u]: unused", |
00317636 | 346 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 347 | if (offset >= curr) |
1bbae9f8 | 348 | ctx->pos = blkoff + |
00317636 | 349 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
350 | continue; |
351 | } | |
352 | ||
353 | /* got a valid entry */ | |
354 | dire = &block->dirents[offset]; | |
355 | nlen = strnlen(dire->u.name, | |
356 | sizeof(*block) - | |
00317636 | 357 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 358 | |
5b5e0928 | 359 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 360 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
361 | (offset < curr ? "skip" : "fill"), |
362 | nlen, dire->u.name); | |
363 | ||
364 | /* work out where the next possible entry is */ | |
00317636 | 365 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 366 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 367 | _debug("ENT[%zu.%u]:" |
1da177e4 | 368 | " %u travelled beyond end dir block" |
5b5e0928 | 369 | " (len %u/%zu)", |
00317636 | 370 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 371 | offset, next, tmp, nlen); |
f51375cd | 372 | return afs_bad(dvnode, afs_file_error_dir_over_end); |
1da177e4 | 373 | } |
00317636 | 374 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 375 | (1 << (next % 8)))) { |
5b5e0928 AD |
376 | _debug("ENT[%zu.%u]:" |
377 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 378 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 379 | offset, next, tmp, nlen); |
f51375cd | 380 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 LT |
381 | } |
382 | ||
5b5e0928 | 383 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 384 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
385 | next, tmp, nlen); |
386 | next++; | |
387 | } | |
388 | ||
389 | /* skip if starts before the current position */ | |
390 | if (offset < curr) | |
391 | continue; | |
392 | ||
393 | /* found the next entry */ | |
1bbae9f8 | 394 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 395 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
396 | (ctx->actor == afs_lookup_filldir || |
397 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 398 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
399 | _leave(" = 0 [full]"); |
400 | return 0; | |
401 | } | |
402 | ||
00317636 | 403 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
404 | } |
405 | ||
406 | _leave(" = 1 [more]"); | |
407 | return 1; | |
ec26815a | 408 | } |
1da177e4 | 409 | |
1da177e4 | 410 | /* |
08e0e7c8 | 411 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 412 | */ |
1bbae9f8 AV |
413 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
414 | struct key *key) | |
1da177e4 | 415 | { |
f3ddee8d | 416 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
417 | struct afs_xdr_dir_page *dbuf; |
418 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 419 | struct afs_read *req; |
1da177e4 LT |
420 | struct page *page; |
421 | unsigned blkoff, limit; | |
422 | int ret; | |
423 | ||
1bbae9f8 | 424 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 425 | |
08e0e7c8 | 426 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
427 | _leave(" = -ESTALE"); |
428 | return -ESTALE; | |
429 | } | |
430 | ||
f3ddee8d DH |
431 | req = afs_read_dir(dvnode, key); |
432 | if (IS_ERR(req)) | |
433 | return PTR_ERR(req); | |
434 | ||
1da177e4 | 435 | /* round the file position up to the next entry boundary */ |
00317636 DH |
436 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
437 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
438 | |
439 | /* walk through the blocks in sequence */ | |
440 | ret = 0; | |
f3ddee8d | 441 | while (ctx->pos < req->actual_len) { |
00317636 | 442 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 443 | |
f3ddee8d DH |
444 | /* Fetch the appropriate page from the directory and re-add it |
445 | * to the LRU. | |
446 | */ | |
447 | page = req->pages[blkoff / PAGE_SIZE]; | |
448 | if (!page) { | |
f51375cd | 449 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
450 | break; |
451 | } | |
f3ddee8d | 452 | mark_page_accessed(page); |
1da177e4 LT |
453 | |
454 | limit = blkoff & ~(PAGE_SIZE - 1); | |
455 | ||
f3ddee8d | 456 | dbuf = kmap(page); |
1da177e4 LT |
457 | |
458 | /* deal with the individual blocks stashed on this page */ | |
459 | do { | |
460 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 461 | sizeof(union afs_xdr_dir_block)]; |
f51375cd | 462 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); |
1da177e4 | 463 | if (ret != 1) { |
f3ddee8d | 464 | kunmap(page); |
1da177e4 LT |
465 | goto out; |
466 | } | |
467 | ||
00317636 | 468 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 469 | |
1bbae9f8 | 470 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 471 | |
f3ddee8d | 472 | kunmap(page); |
1da177e4 LT |
473 | ret = 0; |
474 | } | |
475 | ||
ec26815a | 476 | out: |
b61f7dcf | 477 | up_read(&dvnode->validate_lock); |
f3ddee8d | 478 | afs_put_read(req); |
1da177e4 LT |
479 | _leave(" = %d", ret); |
480 | return ret; | |
ec26815a | 481 | } |
1da177e4 | 482 | |
1da177e4 LT |
483 | /* |
484 | * read an AFS directory | |
485 | */ | |
1bbae9f8 | 486 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 487 | { |
215804a9 | 488 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 489 | } |
1da177e4 | 490 | |
1da177e4 | 491 | /* |
5cf9dd55 | 492 | * Search the directory for a single name |
1da177e4 LT |
493 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
494 | * uniquifier through dtype | |
495 | */ | |
5cf9dd55 DH |
496 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
497 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 498 | { |
5cf9dd55 DH |
499 | struct afs_lookup_one_cookie *cookie = |
500 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 501 | |
1bbae9f8 AV |
502 | _enter("{%s,%u},%s,%u,,%llu,%u", |
503 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 504 | (unsigned long long) ino, dtype); |
1da177e4 | 505 | |
08e0e7c8 | 506 | /* insanity checks first */ |
00317636 DH |
507 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
508 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 509 | |
1bbae9f8 AV |
510 | if (cookie->name.len != nlen || |
511 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
512 | _leave(" = 0 [no]"); |
513 | return 0; | |
514 | } | |
515 | ||
516 | cookie->fid.vnode = ino; | |
517 | cookie->fid.unique = dtype; | |
518 | cookie->found = 1; | |
519 | ||
520 | _leave(" = -1 [found]"); | |
521 | return -1; | |
ec26815a | 522 | } |
1da177e4 | 523 | |
1da177e4 | 524 | /* |
5cf9dd55 | 525 | * Do a lookup of a single name in a directory |
260a9803 | 526 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 527 | */ |
5cf9dd55 DH |
528 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
529 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 530 | { |
1bbae9f8 | 531 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
532 | struct afs_lookup_one_cookie cookie = { |
533 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
534 | .name = dentry->d_name, |
535 | .fid.vid = as->volume->vid | |
536 | }; | |
1da177e4 LT |
537 | int ret; |
538 | ||
a455589f | 539 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 540 | |
1da177e4 | 541 | /* search the directory */ |
1bbae9f8 | 542 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 543 | if (ret < 0) { |
08e0e7c8 DH |
544 | _leave(" = %d [iter]", ret); |
545 | return ret; | |
1da177e4 LT |
546 | } |
547 | ||
548 | ret = -ENOENT; | |
549 | if (!cookie.found) { | |
08e0e7c8 DH |
550 | _leave(" = -ENOENT [not found]"); |
551 | return -ENOENT; | |
1da177e4 LT |
552 | } |
553 | ||
08e0e7c8 | 554 | *fid = cookie.fid; |
3b6492df | 555 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
556 | return 0; |
557 | } | |
558 | ||
5cf9dd55 DH |
559 | /* |
560 | * search the directory for a name | |
561 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
562 | * uniquifier through dtype | |
563 | */ | |
564 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
565 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
566 | { | |
567 | struct afs_lookup_cookie *cookie = | |
568 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
569 | int ret; | |
570 | ||
571 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
572 | cookie->name.name, cookie->name.len, name, nlen, | |
573 | (unsigned long long) ino, dtype); | |
574 | ||
575 | /* insanity checks first */ | |
00317636 DH |
576 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
577 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
578 | |
579 | if (cookie->found) { | |
580 | if (cookie->nr_fids < 50) { | |
581 | cookie->fids[cookie->nr_fids].vnode = ino; | |
582 | cookie->fids[cookie->nr_fids].unique = dtype; | |
583 | cookie->nr_fids++; | |
584 | } | |
585 | } else if (cookie->name.len == nlen && | |
586 | memcmp(cookie->name.name, name, nlen) == 0) { | |
587 | cookie->fids[0].vnode = ino; | |
588 | cookie->fids[0].unique = dtype; | |
589 | cookie->found = 1; | |
590 | if (cookie->one_only) | |
591 | return -1; | |
592 | } | |
593 | ||
594 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
595 | _leave(" = %d", ret); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
601 | * files in one go and create inodes for them. The inode of the file we were | |
602 | * asked for is returned. | |
603 | */ | |
604 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
605 | struct key *key) | |
606 | { | |
607 | struct afs_lookup_cookie *cookie; | |
608 | struct afs_cb_interest *cbi = NULL; | |
609 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
610 | struct afs_iget_data data; | |
611 | struct afs_fs_cursor fc; | |
612 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
613 | struct inode *inode = NULL; | |
614 | int ret, i; | |
615 | ||
616 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
617 | ||
618 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
619 | if (!cookie) | |
620 | return ERR_PTR(-ENOMEM); | |
621 | ||
622 | cookie->ctx.actor = afs_lookup_filldir; | |
623 | cookie->name = dentry->d_name; | |
624 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
625 | ||
626 | read_seqlock_excl(&dvnode->cb_lock); | |
627 | if (dvnode->cb_interest && | |
628 | dvnode->cb_interest->server && | |
629 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
630 | cookie->one_only = true; | |
631 | read_sequnlock_excl(&dvnode->cb_lock); | |
632 | ||
633 | for (i = 0; i < 50; i++) | |
634 | cookie->fids[i].vid = as->volume->vid; | |
635 | ||
636 | /* search the directory */ | |
637 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
638 | if (ret < 0) { | |
639 | inode = ERR_PTR(ret); | |
640 | goto out; | |
641 | } | |
642 | ||
643 | inode = ERR_PTR(-ENOENT); | |
644 | if (!cookie->found) | |
645 | goto out; | |
646 | ||
647 | /* Check to see if we already have an inode for the primary fid. */ | |
648 | data.volume = dvnode->volume; | |
649 | data.fid = cookie->fids[0]; | |
650 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
651 | if (inode) | |
652 | goto out; | |
653 | ||
654 | /* Need space for examining all the selected files */ | |
655 | inode = ERR_PTR(-ENOMEM); | |
656 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
657 | GFP_KERNEL); | |
658 | if (!cookie->statuses) | |
659 | goto out; | |
660 | ||
661 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
662 | GFP_KERNEL); | |
663 | if (!cookie->callbacks) | |
664 | goto out_s; | |
665 | ||
666 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
667 | * lookups contained therein are stored in the reply without aborting | |
668 | * the whole operation. | |
669 | */ | |
670 | if (cookie->one_only) | |
671 | goto no_inline_bulk_status; | |
672 | ||
673 | inode = ERR_PTR(-ERESTARTSYS); | |
674 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
675 | while (afs_select_fileserver(&fc)) { | |
676 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
677 | &fc.cbi->server->flags)) { | |
678 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
679 | fc.ac.error = -ECONNABORTED; | |
680 | break; | |
681 | } | |
682 | afs_fs_inline_bulk_status(&fc, | |
683 | afs_v2net(dvnode), | |
684 | cookie->fids, | |
685 | cookie->statuses, | |
686 | cookie->callbacks, | |
687 | cookie->nr_fids, NULL); | |
688 | } | |
689 | ||
690 | if (fc.ac.error == 0) | |
691 | cbi = afs_get_cb_interest(fc.cbi); | |
692 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
693 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
694 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
695 | } | |
696 | ||
697 | if (!IS_ERR(inode)) | |
698 | goto success; | |
699 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
700 | goto out_c; | |
701 | ||
702 | no_inline_bulk_status: | |
703 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
704 | * any of the lookups fails - so, for the moment, revert to | |
705 | * FS.FetchStatus for just the primary fid. | |
706 | */ | |
707 | cookie->nr_fids = 1; | |
708 | inode = ERR_PTR(-ERESTARTSYS); | |
709 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
710 | while (afs_select_fileserver(&fc)) { | |
711 | afs_fs_fetch_status(&fc, | |
712 | afs_v2net(dvnode), | |
713 | cookie->fids, | |
714 | cookie->statuses, | |
715 | cookie->callbacks, | |
716 | NULL); | |
717 | } | |
718 | ||
719 | if (fc.ac.error == 0) | |
720 | cbi = afs_get_cb_interest(fc.cbi); | |
721 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
722 | } | |
723 | ||
724 | if (IS_ERR(inode)) | |
725 | goto out_c; | |
726 | ||
727 | for (i = 0; i < cookie->nr_fids; i++) | |
728 | cookie->statuses[i].abort_code = 0; | |
729 | ||
730 | success: | |
731 | /* Turn all the files into inodes and save the first one - which is the | |
732 | * one we actually want. | |
733 | */ | |
734 | if (cookie->statuses[0].abort_code != 0) | |
735 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
736 | ||
737 | for (i = 0; i < cookie->nr_fids; i++) { | |
738 | struct inode *ti; | |
739 | ||
740 | if (cookie->statuses[i].abort_code != 0) | |
741 | continue; | |
742 | ||
743 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
744 | &cookie->statuses[i], | |
745 | &cookie->callbacks[i], | |
746 | cbi); | |
747 | if (i == 0) { | |
748 | inode = ti; | |
749 | } else { | |
750 | if (!IS_ERR(ti)) | |
751 | iput(ti); | |
752 | } | |
753 | } | |
754 | ||
755 | out_c: | |
756 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
757 | kfree(cookie->callbacks); | |
758 | out_s: | |
759 | kfree(cookie->statuses); | |
760 | out: | |
761 | kfree(cookie); | |
762 | return inode; | |
763 | } | |
764 | ||
6f8880d8 DH |
765 | /* |
766 | * Look up an entry in a directory with @sys substitution. | |
767 | */ | |
768 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
769 | struct key *key) | |
770 | { | |
771 | struct afs_sysnames *subs; | |
772 | struct afs_net *net = afs_i2net(dir); | |
773 | struct dentry *ret; | |
774 | char *buf, *p, *name; | |
775 | int len, i; | |
776 | ||
777 | _enter(""); | |
778 | ||
779 | ret = ERR_PTR(-ENOMEM); | |
780 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
781 | if (!buf) | |
782 | goto out_p; | |
783 | if (dentry->d_name.len > 4) { | |
784 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
785 | p += dentry->d_name.len - 4; | |
786 | } | |
787 | ||
788 | /* There is an ordered list of substitutes that we have to try. */ | |
789 | read_lock(&net->sysnames_lock); | |
790 | subs = net->sysnames; | |
791 | refcount_inc(&subs->usage); | |
792 | read_unlock(&net->sysnames_lock); | |
793 | ||
794 | for (i = 0; i < subs->nr; i++) { | |
795 | name = subs->subs[i]; | |
796 | len = dentry->d_name.len - 4 + strlen(name); | |
797 | if (len >= AFSNAMEMAX) { | |
798 | ret = ERR_PTR(-ENAMETOOLONG); | |
799 | goto out_s; | |
800 | } | |
801 | ||
802 | strcpy(p, name); | |
803 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
804 | if (IS_ERR(ret) || d_is_positive(ret)) | |
805 | goto out_s; | |
806 | dput(ret); | |
807 | } | |
808 | ||
809 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
810 | * the cached dentry to hide changes to the sysnames list. | |
811 | */ | |
812 | ret = NULL; | |
813 | out_s: | |
814 | afs_put_sysnames(subs); | |
815 | kfree(buf); | |
816 | out_p: | |
817 | key_put(key); | |
818 | return ret; | |
819 | } | |
820 | ||
08e0e7c8 DH |
821 | /* |
822 | * look up an entry in a directory | |
823 | */ | |
260a9803 | 824 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 825 | unsigned int flags) |
08e0e7c8 | 826 | { |
5cf9dd55 | 827 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 828 | struct inode *inode; |
34b2a88f | 829 | struct dentry *d; |
00d3b7a4 | 830 | struct key *key; |
08e0e7c8 DH |
831 | int ret; |
832 | ||
3b6492df | 833 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 834 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 835 | |
2b0143b5 | 836 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 837 | |
45222b9e | 838 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
839 | _leave(" = -ENAMETOOLONG"); |
840 | return ERR_PTR(-ENAMETOOLONG); | |
841 | } | |
842 | ||
5cf9dd55 | 843 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
844 | _leave(" = -ESTALE"); |
845 | return ERR_PTR(-ESTALE); | |
846 | } | |
847 | ||
5cf9dd55 | 848 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
849 | if (IS_ERR(key)) { |
850 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 851 | return ERR_CAST(key); |
00d3b7a4 DH |
852 | } |
853 | ||
5cf9dd55 | 854 | ret = afs_validate(dvnode, key); |
260a9803 DH |
855 | if (ret < 0) { |
856 | key_put(key); | |
857 | _leave(" = %d [val]", ret); | |
858 | return ERR_PTR(ret); | |
859 | } | |
860 | ||
6f8880d8 DH |
861 | if (dentry->d_name.len >= 4 && |
862 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
863 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
864 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
865 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
866 | return afs_lookup_atsys(dir, dentry, key); | |
867 | ||
d55b4da4 | 868 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 869 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 870 | key_put(key); |
34b2a88f AV |
871 | if (inode == ERR_PTR(-ENOENT)) { |
872 | inode = afs_try_auto_mntpt(dentry, dir); | |
34b2a88f AV |
873 | } else { |
874 | dentry->d_fsdata = | |
875 | (void *)(unsigned long)dvnode->status.data_version; | |
08e0e7c8 | 876 | } |
34b2a88f AV |
877 | d = d_splice_alias(inode, dentry); |
878 | if (!IS_ERR_OR_NULL(d)) | |
879 | d->d_fsdata = dentry->d_fsdata; | |
880 | return d; | |
ec26815a | 881 | } |
1da177e4 | 882 | |
1da177e4 LT |
883 | /* |
884 | * check that a dentry lookup hit has found a valid entry | |
885 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
886 | * inode | |
1da177e4 | 887 | */ |
0b728e19 | 888 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 889 | { |
260a9803 | 890 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 891 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 892 | struct dentry *parent; |
c435ee34 | 893 | struct inode *inode; |
00d3b7a4 | 894 | struct key *key; |
a4ff7401 | 895 | long dir_version, de_version; |
1da177e4 LT |
896 | int ret; |
897 | ||
0b728e19 | 898 | if (flags & LOOKUP_RCU) |
34286d66 NP |
899 | return -ECHILD; |
900 | ||
c435ee34 DH |
901 | if (d_really_is_positive(dentry)) { |
902 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 903 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 904 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 905 | vnode->flags); |
c435ee34 | 906 | } else { |
a455589f | 907 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 908 | } |
1da177e4 | 909 | |
260a9803 | 910 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
911 | if (IS_ERR(key)) |
912 | key = NULL; | |
913 | ||
c435ee34 DH |
914 | if (d_really_is_positive(dentry)) { |
915 | inode = d_inode(dentry); | |
916 | if (inode) { | |
917 | vnode = AFS_FS_I(inode); | |
918 | afs_validate(vnode, key); | |
919 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
920 | goto out_bad; | |
921 | } | |
922 | } | |
923 | ||
1da177e4 | 924 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 925 | parent = dget_parent(dentry); |
2b0143b5 | 926 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 927 | |
260a9803 | 928 | /* validate the parent directory */ |
c435ee34 | 929 | afs_validate(dir, key); |
260a9803 DH |
930 | |
931 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 932 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 933 | goto out_bad_parent; |
1da177e4 LT |
934 | } |
935 | ||
a4ff7401 DH |
936 | /* We only need to invalidate a dentry if the server's copy changed |
937 | * behind our back. If we made the change, it's no problem. Note that | |
938 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
939 | * version. | |
940 | */ | |
941 | dir_version = (long)dir->status.data_version; | |
942 | de_version = (long)dentry->d_fsdata; | |
943 | if (de_version == dir_version) | |
944 | goto out_valid; | |
945 | ||
946 | dir_version = (long)dir->invalid_before; | |
947 | if (de_version - dir_version >= 0) | |
948 | goto out_valid; | |
1da177e4 | 949 | |
260a9803 | 950 | _debug("dir modified"); |
d55b4da4 | 951 | afs_stat_v(dir, n_reval); |
260a9803 DH |
952 | |
953 | /* search the directory for this vnode */ | |
5cf9dd55 | 954 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
955 | switch (ret) { |
956 | case 0: | |
957 | /* the filename maps to something */ | |
2b0143b5 | 958 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
959 | goto out_bad_parent; |
960 | inode = d_inode(dentry); | |
961 | if (is_bad_inode(inode)) { | |
a455589f AV |
962 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
963 | dentry); | |
c435ee34 | 964 | goto out_bad_parent; |
1da177e4 LT |
965 | } |
966 | ||
c435ee34 DH |
967 | vnode = AFS_FS_I(inode); |
968 | ||
1da177e4 LT |
969 | /* if the vnode ID has changed, then the dirent points to a |
970 | * different file */ | |
08e0e7c8 | 971 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 972 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 973 | dentry, fid.vnode, |
08e0e7c8 | 974 | vnode->fid.vnode); |
1da177e4 LT |
975 | goto not_found; |
976 | } | |
977 | ||
978 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
979 | * been deleted and replaced, and the original vnode ID has |
980 | * been reused */ | |
08e0e7c8 | 981 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
982 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
983 | dentry, fid.unique, | |
7a224228 | 984 | vnode->fid.unique, |
c435ee34 DH |
985 | vnode->vfs_inode.i_generation); |
986 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 987 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 988 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 989 | goto not_found; |
1da177e4 | 990 | } |
260a9803 | 991 | goto out_valid; |
08e0e7c8 | 992 | |
260a9803 DH |
993 | case -ENOENT: |
994 | /* the filename is unknown */ | |
a455589f | 995 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 996 | if (d_really_is_positive(dentry)) |
260a9803 DH |
997 | goto not_found; |
998 | goto out_valid; | |
1da177e4 | 999 | |
260a9803 | 1000 | default: |
a455589f AV |
1001 | _debug("failed to iterate dir %pd: %d", |
1002 | parent, ret); | |
c435ee34 | 1003 | goto out_bad_parent; |
08e0e7c8 DH |
1004 | } |
1005 | ||
ec26815a | 1006 | out_valid: |
a4ff7401 | 1007 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1008 | dput(parent); |
00d3b7a4 | 1009 | key_put(key); |
1da177e4 LT |
1010 | _leave(" = 1 [valid]"); |
1011 | return 1; | |
1012 | ||
1013 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1014 | not_found: |
1da177e4 LT |
1015 | spin_lock(&dentry->d_lock); |
1016 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1017 | spin_unlock(&dentry->d_lock); | |
1018 | ||
c435ee34 | 1019 | out_bad_parent: |
a455589f | 1020 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1021 | dput(parent); |
c435ee34 | 1022 | out_bad: |
00d3b7a4 | 1023 | key_put(key); |
1da177e4 LT |
1024 | |
1025 | _leave(" = 0 [bad]"); | |
1026 | return 0; | |
ec26815a | 1027 | } |
1da177e4 | 1028 | |
1da177e4 LT |
1029 | /* |
1030 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1031 | * sleep) | |
1032 | * - called from dput() when d_count is going to 0. | |
1033 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1034 | */ | |
fe15ce44 | 1035 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1036 | { |
a455589f | 1037 | _enter("%pd", dentry); |
1da177e4 LT |
1038 | |
1039 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1040 | goto zap; | |
1041 | ||
2b0143b5 DH |
1042 | if (d_really_is_positive(dentry) && |
1043 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1044 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1045 | goto zap; |
1da177e4 LT |
1046 | |
1047 | _leave(" = 0 [keep]"); | |
1048 | return 0; | |
1049 | ||
ec26815a | 1050 | zap: |
1da177e4 LT |
1051 | _leave(" = 1 [zap]"); |
1052 | return 1; | |
ec26815a | 1053 | } |
260a9803 DH |
1054 | |
1055 | /* | |
1056 | * handle dentry release | |
1057 | */ | |
66c7e1d3 | 1058 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1059 | { |
a455589f | 1060 | _enter("%pd", dentry); |
260a9803 DH |
1061 | } |
1062 | ||
d2ddc776 DH |
1063 | /* |
1064 | * Create a new inode for create/mkdir/symlink | |
1065 | */ | |
1066 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1067 | struct dentry *new_dentry, | |
1068 | struct afs_fid *newfid, | |
1069 | struct afs_file_status *newstatus, | |
1070 | struct afs_callback *newcb) | |
1071 | { | |
5a813276 | 1072 | struct afs_vnode *vnode; |
d2ddc776 DH |
1073 | struct inode *inode; |
1074 | ||
1075 | if (fc->ac.error < 0) | |
1076 | return; | |
1077 | ||
1078 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, | |
1079 | newfid, newstatus, newcb, fc->cbi); | |
1080 | if (IS_ERR(inode)) { | |
1081 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1082 | * the new directory on the server. | |
1083 | */ | |
1084 | fc->ac.error = PTR_ERR(inode); | |
1085 | return; | |
1086 | } | |
1087 | ||
5a813276 DH |
1088 | vnode = AFS_FS_I(inode); |
1089 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
00671912 | 1090 | afs_vnode_commit_status(fc, vnode, 0); |
73116df7 | 1091 | d_instantiate(new_dentry, inode); |
d2ddc776 DH |
1092 | } |
1093 | ||
260a9803 DH |
1094 | /* |
1095 | * create a directory on an AFS filesystem | |
1096 | */ | |
18bb1db3 | 1097 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1098 | { |
d2ddc776 DH |
1099 | struct afs_file_status newstatus; |
1100 | struct afs_fs_cursor fc; | |
1101 | struct afs_callback newcb; | |
1102 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1103 | struct afs_fid newfid; | |
260a9803 | 1104 | struct key *key; |
63a4681f | 1105 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1106 | int ret; |
1107 | ||
d2ddc776 | 1108 | mode |= S_IFDIR; |
260a9803 | 1109 | |
3b6492df | 1110 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1111 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1112 | |
260a9803 DH |
1113 | key = afs_request_key(dvnode->volume->cell); |
1114 | if (IS_ERR(key)) { | |
1115 | ret = PTR_ERR(key); | |
1116 | goto error; | |
1117 | } | |
1118 | ||
d2ddc776 DH |
1119 | ret = -ERESTARTSYS; |
1120 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1121 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1122 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1123 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1124 | &newfid, &newstatus, &newcb); |
1125 | } | |
260a9803 | 1126 | |
d2ddc776 DH |
1127 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1128 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1129 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1130 | ret = afs_end_vnode_operation(&fc); | |
1131 | if (ret < 0) | |
1132 | goto error_key; | |
4433b691 DH |
1133 | } else { |
1134 | goto error_key; | |
260a9803 DH |
1135 | } |
1136 | ||
63a4681f DH |
1137 | if (ret == 0 && |
1138 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1139 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1140 | afs_edit_dir_for_create); | |
1141 | ||
260a9803 DH |
1142 | key_put(key); |
1143 | _leave(" = 0"); | |
1144 | return 0; | |
1145 | ||
d2ddc776 | 1146 | error_key: |
260a9803 DH |
1147 | key_put(key); |
1148 | error: | |
1149 | d_drop(dentry); | |
1150 | _leave(" = %d", ret); | |
1151 | return ret; | |
1152 | } | |
1153 | ||
d2ddc776 DH |
1154 | /* |
1155 | * Remove a subdir from a directory. | |
1156 | */ | |
1157 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1158 | { | |
1159 | if (d_really_is_positive(dentry)) { | |
1160 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1161 | ||
1162 | clear_nlink(&vnode->vfs_inode); | |
1163 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1164 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1165 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1166 | } |
1167 | } | |
1168 | ||
260a9803 DH |
1169 | /* |
1170 | * remove a directory from an AFS filesystem | |
1171 | */ | |
1172 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1173 | { | |
d2ddc776 | 1174 | struct afs_fs_cursor fc; |
f58db83f | 1175 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 | 1176 | struct key *key; |
63a4681f | 1177 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1178 | int ret; |
1179 | ||
3b6492df | 1180 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1181 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1182 | |
260a9803 DH |
1183 | key = afs_request_key(dvnode->volume->cell); |
1184 | if (IS_ERR(key)) { | |
1185 | ret = PTR_ERR(key); | |
1186 | goto error; | |
1187 | } | |
1188 | ||
f58db83f DH |
1189 | /* Try to make sure we have a callback promise on the victim. */ |
1190 | if (d_really_is_positive(dentry)) { | |
1191 | vnode = AFS_FS_I(d_inode(dentry)); | |
1192 | ret = afs_validate(vnode, key); | |
1193 | if (ret < 0) | |
1194 | goto error_key; | |
1195 | } | |
1196 | ||
d2ddc776 DH |
1197 | ret = -ERESTARTSYS; |
1198 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1199 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1200 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
30062bd1 | 1201 | afs_fs_remove(&fc, vnode, dentry->d_name.name, true, |
63a4681f | 1202 | data_version); |
d2ddc776 | 1203 | } |
260a9803 | 1204 | |
d2ddc776 DH |
1205 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1206 | ret = afs_end_vnode_operation(&fc); | |
63a4681f | 1207 | if (ret == 0) { |
d2ddc776 | 1208 | afs_dir_remove_subdir(dentry); |
63a4681f DH |
1209 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1210 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1211 | afs_edit_dir_for_rmdir); | |
1212 | } | |
260a9803 DH |
1213 | } |
1214 | ||
f58db83f | 1215 | error_key: |
260a9803 | 1216 | key_put(key); |
260a9803 | 1217 | error: |
260a9803 DH |
1218 | return ret; |
1219 | } | |
1220 | ||
1221 | /* | |
d2ddc776 DH |
1222 | * Remove a link to a file or symlink from a directory. |
1223 | * | |
1224 | * If the file was not deleted due to excess hard links, the fileserver will | |
1225 | * break the callback promise on the file - if it had one - before it returns | |
1226 | * to us, and if it was deleted, it won't | |
1227 | * | |
1228 | * However, if we didn't have a callback promise outstanding, or it was | |
1229 | * outstanding on a different server, then it won't break it either... | |
1230 | */ | |
440fbc3a DH |
1231 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1232 | unsigned long d_version_before, | |
1233 | unsigned long d_version_after) | |
d2ddc776 | 1234 | { |
440fbc3a | 1235 | bool dir_valid; |
d2ddc776 DH |
1236 | int ret = 0; |
1237 | ||
440fbc3a DH |
1238 | /* There were no intervening changes on the server if the version |
1239 | * number we got back was incremented by exactly 1. | |
1240 | */ | |
1241 | dir_valid = (d_version_after == d_version_before + 1); | |
1242 | ||
d2ddc776 DH |
1243 | if (d_really_is_positive(dentry)) { |
1244 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1245 | ||
30062bd1 DH |
1246 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1247 | /* Already done */ | |
1248 | } else if (dir_valid) { | |
440fbc3a DH |
1249 | drop_nlink(&vnode->vfs_inode); |
1250 | if (vnode->vfs_inode.i_nlink == 0) { | |
1251 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1252 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1253 | } | |
d2ddc776 | 1254 | ret = 0; |
440fbc3a DH |
1255 | } else { |
1256 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1257 | ||
1258 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1259 | kdebug("AFS_VNODE_DELETED"); | |
1260 | ||
1261 | ret = afs_validate(vnode, key); | |
1262 | if (ret == -ESTALE) | |
1263 | ret = 0; | |
1264 | } | |
d2ddc776 DH |
1265 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1266 | } | |
1267 | ||
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1273 | */ |
1274 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1275 | { | |
d2ddc776 | 1276 | struct afs_fs_cursor fc; |
30062bd1 | 1277 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 | 1278 | struct key *key; |
440fbc3a | 1279 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
63a4681f | 1280 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1281 | int ret; |
1282 | ||
3b6492df | 1283 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1284 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1285 | |
45222b9e | 1286 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1287 | return -ENAMETOOLONG; |
260a9803 DH |
1288 | |
1289 | key = afs_request_key(dvnode->volume->cell); | |
1290 | if (IS_ERR(key)) { | |
1291 | ret = PTR_ERR(key); | |
1292 | goto error; | |
1293 | } | |
1294 | ||
d2ddc776 | 1295 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1296 | if (d_really_is_positive(dentry)) { |
1297 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1298 | ret = afs_validate(vnode, key); |
1299 | if (ret < 0) | |
d2ddc776 | 1300 | goto error_key; |
260a9803 DH |
1301 | } |
1302 | ||
d2ddc776 DH |
1303 | ret = -ERESTARTSYS; |
1304 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1305 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1306 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
30062bd1 DH |
1307 | |
1308 | if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && | |
1309 | !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { | |
1310 | yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, | |
1311 | data_version); | |
1312 | if (fc.ac.error != -ECONNABORTED || | |
1313 | fc.ac.abort_code != RXGEN_OPCODE) | |
1314 | continue; | |
1315 | set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); | |
1316 | } | |
1317 | ||
1318 | afs_fs_remove(&fc, vnode, dentry->d_name.name, false, | |
63a4681f | 1319 | data_version); |
d2ddc776 | 1320 | } |
260a9803 | 1321 | |
d2ddc776 DH |
1322 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1323 | ret = afs_end_vnode_operation(&fc); | |
1324 | if (ret == 0) | |
440fbc3a DH |
1325 | ret = afs_dir_remove_link( |
1326 | dentry, key, d_version, | |
1327 | (unsigned long)dvnode->status.data_version); | |
63a4681f DH |
1328 | if (ret == 0 && |
1329 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1330 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1331 | afs_edit_dir_for_unlink); | |
260a9803 DH |
1332 | } |
1333 | ||
d2ddc776 | 1334 | error_key: |
260a9803 DH |
1335 | key_put(key); |
1336 | error: | |
1337 | _leave(" = %d", ret); | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * create a regular file on an AFS filesystem | |
1343 | */ | |
4acdaf27 | 1344 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1345 | bool excl) |
260a9803 | 1346 | { |
d2ddc776 DH |
1347 | struct afs_fs_cursor fc; |
1348 | struct afs_file_status newstatus; | |
1349 | struct afs_callback newcb; | |
43dd388b | 1350 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1351 | struct afs_fid newfid; |
260a9803 | 1352 | struct key *key; |
63a4681f | 1353 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1354 | int ret; |
1355 | ||
d2ddc776 | 1356 | mode |= S_IFREG; |
260a9803 | 1357 | |
3b6492df | 1358 | _enter("{%llx:%llu},{%pd},%ho,", |
a455589f | 1359 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1360 | |
d2ddc776 DH |
1361 | ret = -ENAMETOOLONG; |
1362 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1363 | goto error; | |
1364 | ||
260a9803 DH |
1365 | key = afs_request_key(dvnode->volume->cell); |
1366 | if (IS_ERR(key)) { | |
1367 | ret = PTR_ERR(key); | |
1368 | goto error; | |
1369 | } | |
1370 | ||
d2ddc776 DH |
1371 | ret = -ERESTARTSYS; |
1372 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1373 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1374 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1375 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1376 | &newfid, &newstatus, &newcb); |
1377 | } | |
260a9803 | 1378 | |
d2ddc776 DH |
1379 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1380 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1381 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1382 | ret = afs_end_vnode_operation(&fc); | |
1383 | if (ret < 0) | |
1384 | goto error_key; | |
4433b691 DH |
1385 | } else { |
1386 | goto error_key; | |
260a9803 DH |
1387 | } |
1388 | ||
63a4681f DH |
1389 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1390 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1391 | afs_edit_dir_for_create); | |
1392 | ||
260a9803 DH |
1393 | key_put(key); |
1394 | _leave(" = 0"); | |
1395 | return 0; | |
1396 | ||
d2ddc776 | 1397 | error_key: |
260a9803 DH |
1398 | key_put(key); |
1399 | error: | |
1400 | d_drop(dentry); | |
1401 | _leave(" = %d", ret); | |
1402 | return ret; | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * create a hard link between files in an AFS filesystem | |
1407 | */ | |
1408 | static int afs_link(struct dentry *from, struct inode *dir, | |
1409 | struct dentry *dentry) | |
1410 | { | |
d2ddc776 | 1411 | struct afs_fs_cursor fc; |
260a9803 DH |
1412 | struct afs_vnode *dvnode, *vnode; |
1413 | struct key *key; | |
63a4681f | 1414 | u64 data_version; |
260a9803 DH |
1415 | int ret; |
1416 | ||
2b0143b5 | 1417 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 | 1418 | dvnode = AFS_FS_I(dir); |
63a4681f | 1419 | data_version = dvnode->status.data_version; |
260a9803 | 1420 | |
3b6492df | 1421 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1422 | vnode->fid.vid, vnode->fid.vnode, |
1423 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1424 | dentry); |
260a9803 | 1425 | |
d2ddc776 DH |
1426 | ret = -ENAMETOOLONG; |
1427 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1428 | goto error; | |
1429 | ||
260a9803 DH |
1430 | key = afs_request_key(dvnode->volume->cell); |
1431 | if (IS_ERR(key)) { | |
1432 | ret = PTR_ERR(key); | |
1433 | goto error; | |
1434 | } | |
1435 | ||
d2ddc776 DH |
1436 | ret = -ERESTARTSYS; |
1437 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1438 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1439 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1440 | goto error_key; |
d2ddc776 DH |
1441 | } |
1442 | ||
1443 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1444 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
1445 | fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); | |
63a4681f | 1446 | afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); |
d2ddc776 DH |
1447 | } |
1448 | ||
1449 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1450 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1451 | ihold(&vnode->vfs_inode); | |
1452 | d_instantiate(dentry, &vnode->vfs_inode); | |
1453 | ||
1454 | mutex_unlock(&vnode->io_lock); | |
1455 | ret = afs_end_vnode_operation(&fc); | |
1456 | if (ret < 0) | |
1457 | goto error_key; | |
4433b691 DH |
1458 | } else { |
1459 | goto error_key; | |
d2ddc776 | 1460 | } |
260a9803 | 1461 | |
63a4681f DH |
1462 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1463 | afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, | |
1464 | afs_edit_dir_for_link); | |
1465 | ||
260a9803 DH |
1466 | key_put(key); |
1467 | _leave(" = 0"); | |
1468 | return 0; | |
1469 | ||
d2ddc776 | 1470 | error_key: |
260a9803 DH |
1471 | key_put(key); |
1472 | error: | |
1473 | d_drop(dentry); | |
1474 | _leave(" = %d", ret); | |
1475 | return ret; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * create a symlink in an AFS filesystem | |
1480 | */ | |
1481 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1482 | const char *content) | |
1483 | { | |
d2ddc776 DH |
1484 | struct afs_fs_cursor fc; |
1485 | struct afs_file_status newstatus; | |
1486 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1487 | struct afs_fid newfid; | |
260a9803 | 1488 | struct key *key; |
63a4681f | 1489 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1490 | int ret; |
1491 | ||
3b6492df | 1492 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1493 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1494 | content); |
1495 | ||
d2ddc776 DH |
1496 | ret = -ENAMETOOLONG; |
1497 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1498 | goto error; | |
1499 | ||
260a9803 | 1500 | ret = -EINVAL; |
45222b9e | 1501 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1502 | goto error; |
1503 | ||
1504 | key = afs_request_key(dvnode->volume->cell); | |
1505 | if (IS_ERR(key)) { | |
1506 | ret = PTR_ERR(key); | |
1507 | goto error; | |
1508 | } | |
1509 | ||
d2ddc776 DH |
1510 | ret = -ERESTARTSYS; |
1511 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1512 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1513 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f DH |
1514 | afs_fs_symlink(&fc, dentry->d_name.name, |
1515 | content, data_version, | |
d2ddc776 DH |
1516 | &newfid, &newstatus); |
1517 | } | |
260a9803 | 1518 | |
d2ddc776 DH |
1519 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1520 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1521 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1522 | ret = afs_end_vnode_operation(&fc); | |
1523 | if (ret < 0) | |
1524 | goto error_key; | |
4433b691 DH |
1525 | } else { |
1526 | goto error_key; | |
260a9803 DH |
1527 | } |
1528 | ||
63a4681f DH |
1529 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1530 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1531 | afs_edit_dir_for_symlink); | |
1532 | ||
260a9803 DH |
1533 | key_put(key); |
1534 | _leave(" = 0"); | |
1535 | return 0; | |
1536 | ||
d2ddc776 | 1537 | error_key: |
260a9803 DH |
1538 | key_put(key); |
1539 | error: | |
1540 | d_drop(dentry); | |
1541 | _leave(" = %d", ret); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * rename a file in an AFS filesystem and/or move it between directories | |
1547 | */ | |
1548 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1549 | struct inode *new_dir, struct dentry *new_dentry, |
1550 | unsigned int flags) | |
260a9803 | 1551 | { |
d2ddc776 | 1552 | struct afs_fs_cursor fc; |
260a9803 DH |
1553 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1554 | struct key *key; | |
63a4681f DH |
1555 | u64 orig_data_version, new_data_version; |
1556 | bool new_negative = d_is_negative(new_dentry); | |
260a9803 DH |
1557 | int ret; |
1558 | ||
1cd66c93 MS |
1559 | if (flags) |
1560 | return -EINVAL; | |
1561 | ||
2b0143b5 | 1562 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1563 | orig_dvnode = AFS_FS_I(old_dir); |
1564 | new_dvnode = AFS_FS_I(new_dir); | |
63a4681f DH |
1565 | orig_data_version = orig_dvnode->status.data_version; |
1566 | new_data_version = new_dvnode->status.data_version; | |
260a9803 | 1567 | |
3b6492df | 1568 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1569 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1570 | vnode->fid.vid, vnode->fid.vnode, | |
1571 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1572 | new_dentry); |
260a9803 | 1573 | |
260a9803 DH |
1574 | key = afs_request_key(orig_dvnode->volume->cell); |
1575 | if (IS_ERR(key)) { | |
1576 | ret = PTR_ERR(key); | |
1577 | goto error; | |
1578 | } | |
1579 | ||
d2ddc776 DH |
1580 | ret = -ERESTARTSYS; |
1581 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1582 | if (orig_dvnode != new_dvnode) { | |
1583 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1584 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1585 | goto error_key; |
d2ddc776 DH |
1586 | } |
1587 | } | |
1588 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1589 | fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); |
1590 | fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); | |
d2ddc776 | 1591 | afs_fs_rename(&fc, old_dentry->d_name.name, |
63a4681f DH |
1592 | new_dvnode, new_dentry->d_name.name, |
1593 | orig_data_version, new_data_version); | |
d2ddc776 DH |
1594 | } |
1595 | ||
1596 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1597 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1598 | if (orig_dvnode != new_dvnode) | |
1599 | mutex_unlock(&new_dvnode->io_lock); | |
1600 | ret = afs_end_vnode_operation(&fc); | |
1601 | if (ret < 0) | |
1602 | goto error_key; | |
1603 | } | |
1604 | ||
63a4681f DH |
1605 | if (ret == 0) { |
1606 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) | |
1607 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1608 | afs_edit_dir_for_rename); | |
1609 | ||
1610 | if (!new_negative && | |
1611 | test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1612 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1613 | afs_edit_dir_for_rename); | |
1614 | ||
1615 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1616 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1617 | &vnode->fid, afs_edit_dir_for_rename); | |
1618 | } | |
1619 | ||
d2ddc776 | 1620 | error_key: |
260a9803 DH |
1621 | key_put(key); |
1622 | error: | |
260a9803 DH |
1623 | _leave(" = %d", ret); |
1624 | return ret; | |
1625 | } | |
f3ddee8d DH |
1626 | |
1627 | /* | |
1628 | * Release a directory page and clean up its private state if it's not busy | |
1629 | * - return true if the page can now be released, false if not | |
1630 | */ | |
1631 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1632 | { | |
1633 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1634 | ||
3b6492df | 1635 | _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); |
f3ddee8d DH |
1636 | |
1637 | set_page_private(page, 0); | |
1638 | ClearPagePrivate(page); | |
1639 | ||
1640 | /* The directory will need reloading. */ | |
1641 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1642 | afs_stat_v(dvnode, n_relpg); | |
1643 | return 1; | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * invalidate part or all of a page | |
1648 | * - release a page and clean up its private data if offset is 0 (indicating | |
1649 | * the entire page) | |
1650 | */ | |
1651 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1652 | unsigned int length) | |
1653 | { | |
1654 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1655 | ||
1656 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1657 | ||
1658 | BUG_ON(!PageLocked(page)); | |
1659 | ||
1660 | /* The directory will need reloading. */ | |
1661 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1662 | afs_stat_v(dvnode, n_inval); | |
1663 | ||
1664 | /* we clean up only if the entire page is being invalidated */ | |
1665 | if (offset == 0 && length == PAGE_SIZE) { | |
1666 | set_page_private(page, 0); | |
1667 | ClearPagePrivate(page); | |
1668 | } | |
1669 | } |