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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 */ | |
133 | dbuf = page_address(page); | |
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); |
1da177e4 LT |
140 | goto error; |
141 | } | |
142 | } | |
143 | ||
dab17c1a | 144 | checked: |
f3ddee8d | 145 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 146 | return true; |
1da177e4 | 147 | |
ec26815a | 148 | error: |
be5b82db | 149 | return false; |
ec26815a | 150 | } |
1da177e4 | 151 | |
1da177e4 LT |
152 | /* |
153 | * open an AFS directory file | |
154 | */ | |
155 | static int afs_dir_open(struct inode *inode, struct file *file) | |
156 | { | |
157 | _enter("{%lu}", inode->i_ino); | |
158 | ||
00317636 DH |
159 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
160 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 161 | |
08e0e7c8 | 162 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
163 | return -ENOENT; |
164 | ||
00d3b7a4 | 165 | return afs_open(inode, file); |
ec26815a | 166 | } |
1da177e4 | 167 | |
f3ddee8d DH |
168 | /* |
169 | * Read the directory into the pagecache in one go, scrubbing the previous | |
170 | * contents. The list of pages is returned, pinning them so that they don't | |
171 | * get reclaimed during the iteration. | |
172 | */ | |
173 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
174 | { | |
175 | struct afs_read *req; | |
176 | loff_t i_size; | |
177 | int nr_pages, nr_inline, i, n; | |
178 | int ret = -ENOMEM; | |
179 | ||
180 | retry: | |
181 | i_size = i_size_read(&dvnode->vfs_inode); | |
182 | if (i_size < 2048) | |
183 | return ERR_PTR(-EIO); | |
184 | if (i_size > 2048 * 1024) | |
185 | return ERR_PTR(-EFBIG); | |
186 | ||
187 | _enter("%llu", i_size); | |
188 | ||
189 | /* Get a request record to hold the page list. We want to hold it | |
190 | * inline if we can, but we don't want to make an order 1 allocation. | |
191 | */ | |
192 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
193 | nr_inline = nr_pages; | |
194 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
195 | nr_inline = 0; | |
196 | ||
197 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
198 | GFP_KERNEL); | |
199 | if (!req) | |
200 | return ERR_PTR(-ENOMEM); | |
201 | ||
202 | refcount_set(&req->usage, 1); | |
203 | req->nr_pages = nr_pages; | |
204 | req->actual_len = i_size; /* May change */ | |
205 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
206 | req->data_version = dvnode->status.data_version; /* May change */ | |
207 | if (nr_inline > 0) { | |
208 | req->pages = req->array; | |
209 | } else { | |
210 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
211 | GFP_KERNEL); | |
212 | if (!req->pages) | |
213 | goto error; | |
214 | } | |
215 | ||
216 | /* Get a list of all the pages that hold or will hold the directory | |
217 | * content. We need to fill in any gaps that we might find where the | |
218 | * memory reclaimer has been at work. If there are any gaps, we will | |
219 | * need to reread the entire directory contents. | |
220 | */ | |
221 | i = 0; | |
222 | do { | |
223 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
224 | req->nr_pages - i, | |
225 | req->pages + i); | |
226 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
227 | if (n == 0) { | |
228 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
229 | ||
230 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
231 | afs_stat_v(dvnode, n_inval); | |
232 | ||
233 | ret = -ENOMEM; | |
234 | req->pages[i] = __page_cache_alloc(gfp); | |
235 | if (!req->pages[i]) | |
236 | goto error; | |
237 | ret = add_to_page_cache_lru(req->pages[i], | |
238 | dvnode->vfs_inode.i_mapping, | |
239 | i, gfp); | |
240 | if (ret < 0) | |
241 | goto error; | |
242 | ||
243 | set_page_private(req->pages[i], 1); | |
244 | SetPagePrivate(req->pages[i]); | |
245 | unlock_page(req->pages[i]); | |
246 | i++; | |
247 | } else { | |
248 | i += n; | |
249 | } | |
250 | } while (i < req->nr_pages); | |
251 | ||
252 | /* If we're going to reload, we need to lock all the pages to prevent | |
253 | * races. | |
254 | */ | |
255 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
256 | ret = -ERESTARTSYS; | |
257 | for (i = 0; i < req->nr_pages; i++) | |
258 | if (lock_page_killable(req->pages[i]) < 0) | |
259 | goto error_unlock; | |
260 | ||
261 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
262 | goto success; | |
263 | ||
264 | ret = afs_fetch_data(dvnode, key, req); | |
265 | if (ret < 0) | |
266 | goto error_unlock_all; | |
267 | ||
268 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
269 | ||
270 | if (req->len < req->file_size) | |
271 | goto content_has_grown; | |
272 | ||
273 | /* Validate the data we just read. */ | |
274 | ret = -EIO; | |
275 | for (i = 0; i < req->nr_pages; i++) | |
276 | if (!afs_dir_check_page(dvnode, req->pages[i], | |
277 | req->actual_len)) | |
278 | goto error_unlock_all; | |
279 | ||
280 | // TODO: Trim excess pages | |
281 | ||
282 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
283 | } | |
284 | ||
285 | success: | |
286 | i = req->nr_pages; | |
287 | while (i > 0) | |
288 | unlock_page(req->pages[--i]); | |
289 | return req; | |
290 | ||
291 | error_unlock_all: | |
292 | i = req->nr_pages; | |
293 | error_unlock: | |
294 | while (i > 0) | |
295 | unlock_page(req->pages[--i]); | |
296 | error: | |
297 | afs_put_read(req); | |
298 | _leave(" = %d", ret); | |
299 | return ERR_PTR(ret); | |
300 | ||
301 | content_has_grown: | |
302 | i = req->nr_pages; | |
303 | while (i > 0) | |
304 | unlock_page(req->pages[--i]); | |
305 | afs_put_read(req); | |
306 | goto retry; | |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * deal with one block in an AFS directory | |
311 | */ | |
1bbae9f8 | 312 | static int afs_dir_iterate_block(struct dir_context *ctx, |
00317636 | 313 | union afs_xdr_dir_block *block, |
1bbae9f8 | 314 | unsigned blkoff) |
1da177e4 | 315 | { |
00317636 | 316 | union afs_xdr_dirent *dire; |
1da177e4 LT |
317 | unsigned offset, next, curr; |
318 | size_t nlen; | |
1bbae9f8 | 319 | int tmp; |
1da177e4 | 320 | |
1bbae9f8 | 321 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 322 | |
00317636 | 323 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
324 | |
325 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
326 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
327 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
328 | offset = next |
329 | ) { | |
330 | next = offset + 1; | |
331 | ||
332 | /* skip entries marked unused in the bitmap */ | |
00317636 | 333 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 334 | (1 << (offset % 8)))) { |
5b5e0928 | 335 | _debug("ENT[%zu.%u]: unused", |
00317636 | 336 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 337 | if (offset >= curr) |
1bbae9f8 | 338 | ctx->pos = blkoff + |
00317636 | 339 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
340 | continue; |
341 | } | |
342 | ||
343 | /* got a valid entry */ | |
344 | dire = &block->dirents[offset]; | |
345 | nlen = strnlen(dire->u.name, | |
346 | sizeof(*block) - | |
00317636 | 347 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 348 | |
5b5e0928 | 349 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 350 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
351 | (offset < curr ? "skip" : "fill"), |
352 | nlen, dire->u.name); | |
353 | ||
354 | /* work out where the next possible entry is */ | |
00317636 | 355 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 356 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 357 | _debug("ENT[%zu.%u]:" |
1da177e4 | 358 | " %u travelled beyond end dir block" |
5b5e0928 | 359 | " (len %u/%zu)", |
00317636 | 360 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
361 | offset, next, tmp, nlen); |
362 | return -EIO; | |
363 | } | |
00317636 | 364 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 365 | (1 << (next % 8)))) { |
5b5e0928 AD |
366 | _debug("ENT[%zu.%u]:" |
367 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 368 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
369 | offset, next, tmp, nlen); |
370 | return -EIO; | |
371 | } | |
372 | ||
5b5e0928 | 373 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 374 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
375 | next, tmp, nlen); |
376 | next++; | |
377 | } | |
378 | ||
379 | /* skip if starts before the current position */ | |
380 | if (offset < curr) | |
381 | continue; | |
382 | ||
383 | /* found the next entry */ | |
1bbae9f8 | 384 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 385 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
386 | (ctx->actor == afs_lookup_filldir || |
387 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 388 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
389 | _leave(" = 0 [full]"); |
390 | return 0; | |
391 | } | |
392 | ||
00317636 | 393 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
394 | } |
395 | ||
396 | _leave(" = 1 [more]"); | |
397 | return 1; | |
ec26815a | 398 | } |
1da177e4 | 399 | |
1da177e4 | 400 | /* |
08e0e7c8 | 401 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 402 | */ |
1bbae9f8 AV |
403 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
404 | struct key *key) | |
1da177e4 | 405 | { |
f3ddee8d | 406 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
407 | struct afs_xdr_dir_page *dbuf; |
408 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 409 | struct afs_read *req; |
1da177e4 LT |
410 | struct page *page; |
411 | unsigned blkoff, limit; | |
412 | int ret; | |
413 | ||
1bbae9f8 | 414 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 415 | |
08e0e7c8 | 416 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
417 | _leave(" = -ESTALE"); |
418 | return -ESTALE; | |
419 | } | |
420 | ||
f3ddee8d DH |
421 | req = afs_read_dir(dvnode, key); |
422 | if (IS_ERR(req)) | |
423 | return PTR_ERR(req); | |
424 | ||
1da177e4 | 425 | /* round the file position up to the next entry boundary */ |
00317636 DH |
426 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
427 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
428 | |
429 | /* walk through the blocks in sequence */ | |
430 | ret = 0; | |
f3ddee8d | 431 | while (ctx->pos < req->actual_len) { |
00317636 | 432 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 433 | |
f3ddee8d DH |
434 | /* Fetch the appropriate page from the directory and re-add it |
435 | * to the LRU. | |
436 | */ | |
437 | page = req->pages[blkoff / PAGE_SIZE]; | |
438 | if (!page) { | |
439 | ret = -EIO; | |
1da177e4 LT |
440 | break; |
441 | } | |
f3ddee8d | 442 | mark_page_accessed(page); |
1da177e4 LT |
443 | |
444 | limit = blkoff & ~(PAGE_SIZE - 1); | |
445 | ||
f3ddee8d | 446 | dbuf = kmap(page); |
1da177e4 LT |
447 | |
448 | /* deal with the individual blocks stashed on this page */ | |
449 | do { | |
450 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 451 | sizeof(union afs_xdr_dir_block)]; |
1bbae9f8 | 452 | ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
1da177e4 | 453 | if (ret != 1) { |
f3ddee8d | 454 | kunmap(page); |
1da177e4 LT |
455 | goto out; |
456 | } | |
457 | ||
00317636 | 458 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 459 | |
1bbae9f8 | 460 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 461 | |
f3ddee8d | 462 | kunmap(page); |
1da177e4 LT |
463 | ret = 0; |
464 | } | |
465 | ||
ec26815a | 466 | out: |
f3ddee8d | 467 | afs_put_read(req); |
1da177e4 LT |
468 | _leave(" = %d", ret); |
469 | return ret; | |
ec26815a | 470 | } |
1da177e4 | 471 | |
1da177e4 LT |
472 | /* |
473 | * read an AFS directory | |
474 | */ | |
1bbae9f8 | 475 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 476 | { |
215804a9 | 477 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 478 | } |
1da177e4 | 479 | |
1da177e4 | 480 | /* |
5cf9dd55 | 481 | * Search the directory for a single name |
1da177e4 LT |
482 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
483 | * uniquifier through dtype | |
484 | */ | |
5cf9dd55 DH |
485 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
486 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 487 | { |
5cf9dd55 DH |
488 | struct afs_lookup_one_cookie *cookie = |
489 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 490 | |
1bbae9f8 AV |
491 | _enter("{%s,%u},%s,%u,,%llu,%u", |
492 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 493 | (unsigned long long) ino, dtype); |
1da177e4 | 494 | |
08e0e7c8 | 495 | /* insanity checks first */ |
00317636 DH |
496 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
497 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 498 | |
1bbae9f8 AV |
499 | if (cookie->name.len != nlen || |
500 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
501 | _leave(" = 0 [no]"); |
502 | return 0; | |
503 | } | |
504 | ||
505 | cookie->fid.vnode = ino; | |
506 | cookie->fid.unique = dtype; | |
507 | cookie->found = 1; | |
508 | ||
509 | _leave(" = -1 [found]"); | |
510 | return -1; | |
ec26815a | 511 | } |
1da177e4 | 512 | |
1da177e4 | 513 | /* |
5cf9dd55 | 514 | * Do a lookup of a single name in a directory |
260a9803 | 515 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 516 | */ |
5cf9dd55 DH |
517 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
518 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 519 | { |
1bbae9f8 | 520 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
521 | struct afs_lookup_one_cookie cookie = { |
522 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
523 | .name = dentry->d_name, |
524 | .fid.vid = as->volume->vid | |
525 | }; | |
1da177e4 LT |
526 | int ret; |
527 | ||
a455589f | 528 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 529 | |
1da177e4 | 530 | /* search the directory */ |
1bbae9f8 | 531 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 532 | if (ret < 0) { |
08e0e7c8 DH |
533 | _leave(" = %d [iter]", ret); |
534 | return ret; | |
1da177e4 LT |
535 | } |
536 | ||
537 | ret = -ENOENT; | |
538 | if (!cookie.found) { | |
08e0e7c8 DH |
539 | _leave(" = -ENOENT [not found]"); |
540 | return -ENOENT; | |
1da177e4 LT |
541 | } |
542 | ||
08e0e7c8 DH |
543 | *fid = cookie.fid; |
544 | _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); | |
545 | return 0; | |
546 | } | |
547 | ||
5cf9dd55 DH |
548 | /* |
549 | * search the directory for a name | |
550 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
551 | * uniquifier through dtype | |
552 | */ | |
553 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
554 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
555 | { | |
556 | struct afs_lookup_cookie *cookie = | |
557 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
558 | int ret; | |
559 | ||
560 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
561 | cookie->name.name, cookie->name.len, name, nlen, | |
562 | (unsigned long long) ino, dtype); | |
563 | ||
564 | /* insanity checks first */ | |
00317636 DH |
565 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
566 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
567 | |
568 | if (cookie->found) { | |
569 | if (cookie->nr_fids < 50) { | |
570 | cookie->fids[cookie->nr_fids].vnode = ino; | |
571 | cookie->fids[cookie->nr_fids].unique = dtype; | |
572 | cookie->nr_fids++; | |
573 | } | |
574 | } else if (cookie->name.len == nlen && | |
575 | memcmp(cookie->name.name, name, nlen) == 0) { | |
576 | cookie->fids[0].vnode = ino; | |
577 | cookie->fids[0].unique = dtype; | |
578 | cookie->found = 1; | |
579 | if (cookie->one_only) | |
580 | return -1; | |
581 | } | |
582 | ||
583 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
584 | _leave(" = %d", ret); | |
585 | return ret; | |
586 | } | |
587 | ||
588 | /* | |
589 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
590 | * files in one go and create inodes for them. The inode of the file we were | |
591 | * asked for is returned. | |
592 | */ | |
593 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
594 | struct key *key) | |
595 | { | |
596 | struct afs_lookup_cookie *cookie; | |
597 | struct afs_cb_interest *cbi = NULL; | |
598 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
599 | struct afs_iget_data data; | |
600 | struct afs_fs_cursor fc; | |
601 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
602 | struct inode *inode = NULL; | |
603 | int ret, i; | |
604 | ||
605 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
606 | ||
607 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
608 | if (!cookie) | |
609 | return ERR_PTR(-ENOMEM); | |
610 | ||
611 | cookie->ctx.actor = afs_lookup_filldir; | |
612 | cookie->name = dentry->d_name; | |
613 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
614 | ||
615 | read_seqlock_excl(&dvnode->cb_lock); | |
616 | if (dvnode->cb_interest && | |
617 | dvnode->cb_interest->server && | |
618 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
619 | cookie->one_only = true; | |
620 | read_sequnlock_excl(&dvnode->cb_lock); | |
621 | ||
622 | for (i = 0; i < 50; i++) | |
623 | cookie->fids[i].vid = as->volume->vid; | |
624 | ||
625 | /* search the directory */ | |
626 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
627 | if (ret < 0) { | |
628 | inode = ERR_PTR(ret); | |
629 | goto out; | |
630 | } | |
631 | ||
632 | inode = ERR_PTR(-ENOENT); | |
633 | if (!cookie->found) | |
634 | goto out; | |
635 | ||
636 | /* Check to see if we already have an inode for the primary fid. */ | |
637 | data.volume = dvnode->volume; | |
638 | data.fid = cookie->fids[0]; | |
639 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
640 | if (inode) | |
641 | goto out; | |
642 | ||
643 | /* Need space for examining all the selected files */ | |
644 | inode = ERR_PTR(-ENOMEM); | |
645 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
646 | GFP_KERNEL); | |
647 | if (!cookie->statuses) | |
648 | goto out; | |
649 | ||
650 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
651 | GFP_KERNEL); | |
652 | if (!cookie->callbacks) | |
653 | goto out_s; | |
654 | ||
655 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
656 | * lookups contained therein are stored in the reply without aborting | |
657 | * the whole operation. | |
658 | */ | |
659 | if (cookie->one_only) | |
660 | goto no_inline_bulk_status; | |
661 | ||
662 | inode = ERR_PTR(-ERESTARTSYS); | |
663 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
664 | while (afs_select_fileserver(&fc)) { | |
665 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
666 | &fc.cbi->server->flags)) { | |
667 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
668 | fc.ac.error = -ECONNABORTED; | |
669 | break; | |
670 | } | |
671 | afs_fs_inline_bulk_status(&fc, | |
672 | afs_v2net(dvnode), | |
673 | cookie->fids, | |
674 | cookie->statuses, | |
675 | cookie->callbacks, | |
676 | cookie->nr_fids, NULL); | |
677 | } | |
678 | ||
679 | if (fc.ac.error == 0) | |
680 | cbi = afs_get_cb_interest(fc.cbi); | |
681 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
682 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
683 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
684 | } | |
685 | ||
686 | if (!IS_ERR(inode)) | |
687 | goto success; | |
688 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
689 | goto out_c; | |
690 | ||
691 | no_inline_bulk_status: | |
692 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
693 | * any of the lookups fails - so, for the moment, revert to | |
694 | * FS.FetchStatus for just the primary fid. | |
695 | */ | |
696 | cookie->nr_fids = 1; | |
697 | inode = ERR_PTR(-ERESTARTSYS); | |
698 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
699 | while (afs_select_fileserver(&fc)) { | |
700 | afs_fs_fetch_status(&fc, | |
701 | afs_v2net(dvnode), | |
702 | cookie->fids, | |
703 | cookie->statuses, | |
704 | cookie->callbacks, | |
705 | NULL); | |
706 | } | |
707 | ||
708 | if (fc.ac.error == 0) | |
709 | cbi = afs_get_cb_interest(fc.cbi); | |
710 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
711 | } | |
712 | ||
713 | if (IS_ERR(inode)) | |
714 | goto out_c; | |
715 | ||
716 | for (i = 0; i < cookie->nr_fids; i++) | |
717 | cookie->statuses[i].abort_code = 0; | |
718 | ||
719 | success: | |
720 | /* Turn all the files into inodes and save the first one - which is the | |
721 | * one we actually want. | |
722 | */ | |
723 | if (cookie->statuses[0].abort_code != 0) | |
724 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
725 | ||
726 | for (i = 0; i < cookie->nr_fids; i++) { | |
727 | struct inode *ti; | |
728 | ||
729 | if (cookie->statuses[i].abort_code != 0) | |
730 | continue; | |
731 | ||
732 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
733 | &cookie->statuses[i], | |
734 | &cookie->callbacks[i], | |
735 | cbi); | |
736 | if (i == 0) { | |
737 | inode = ti; | |
738 | } else { | |
739 | if (!IS_ERR(ti)) | |
740 | iput(ti); | |
741 | } | |
742 | } | |
743 | ||
744 | out_c: | |
745 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
746 | kfree(cookie->callbacks); | |
747 | out_s: | |
748 | kfree(cookie->statuses); | |
749 | out: | |
750 | kfree(cookie); | |
751 | return inode; | |
752 | } | |
753 | ||
6f8880d8 DH |
754 | /* |
755 | * Look up an entry in a directory with @sys substitution. | |
756 | */ | |
757 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
758 | struct key *key) | |
759 | { | |
760 | struct afs_sysnames *subs; | |
761 | struct afs_net *net = afs_i2net(dir); | |
762 | struct dentry *ret; | |
763 | char *buf, *p, *name; | |
764 | int len, i; | |
765 | ||
766 | _enter(""); | |
767 | ||
768 | ret = ERR_PTR(-ENOMEM); | |
769 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
770 | if (!buf) | |
771 | goto out_p; | |
772 | if (dentry->d_name.len > 4) { | |
773 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
774 | p += dentry->d_name.len - 4; | |
775 | } | |
776 | ||
777 | /* There is an ordered list of substitutes that we have to try. */ | |
778 | read_lock(&net->sysnames_lock); | |
779 | subs = net->sysnames; | |
780 | refcount_inc(&subs->usage); | |
781 | read_unlock(&net->sysnames_lock); | |
782 | ||
783 | for (i = 0; i < subs->nr; i++) { | |
784 | name = subs->subs[i]; | |
785 | len = dentry->d_name.len - 4 + strlen(name); | |
786 | if (len >= AFSNAMEMAX) { | |
787 | ret = ERR_PTR(-ENAMETOOLONG); | |
788 | goto out_s; | |
789 | } | |
790 | ||
791 | strcpy(p, name); | |
792 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
793 | if (IS_ERR(ret) || d_is_positive(ret)) | |
794 | goto out_s; | |
795 | dput(ret); | |
796 | } | |
797 | ||
798 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
799 | * the cached dentry to hide changes to the sysnames list. | |
800 | */ | |
801 | ret = NULL; | |
802 | out_s: | |
803 | afs_put_sysnames(subs); | |
804 | kfree(buf); | |
805 | out_p: | |
806 | key_put(key); | |
807 | return ret; | |
808 | } | |
809 | ||
08e0e7c8 DH |
810 | /* |
811 | * look up an entry in a directory | |
812 | */ | |
260a9803 | 813 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 814 | unsigned int flags) |
08e0e7c8 | 815 | { |
5cf9dd55 | 816 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 817 | struct inode *inode; |
00d3b7a4 | 818 | struct key *key; |
08e0e7c8 DH |
819 | int ret; |
820 | ||
a455589f | 821 | _enter("{%x:%u},%p{%pd},", |
5cf9dd55 | 822 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 823 | |
2b0143b5 | 824 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 825 | |
45222b9e | 826 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
827 | _leave(" = -ENAMETOOLONG"); |
828 | return ERR_PTR(-ENAMETOOLONG); | |
829 | } | |
830 | ||
5cf9dd55 | 831 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
832 | _leave(" = -ESTALE"); |
833 | return ERR_PTR(-ESTALE); | |
834 | } | |
835 | ||
5cf9dd55 | 836 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
837 | if (IS_ERR(key)) { |
838 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 839 | return ERR_CAST(key); |
00d3b7a4 DH |
840 | } |
841 | ||
5cf9dd55 | 842 | ret = afs_validate(dvnode, key); |
260a9803 DH |
843 | if (ret < 0) { |
844 | key_put(key); | |
845 | _leave(" = %d [val]", ret); | |
846 | return ERR_PTR(ret); | |
847 | } | |
848 | ||
6f8880d8 DH |
849 | if (dentry->d_name.len >= 4 && |
850 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
851 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
852 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
853 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
854 | return afs_lookup_atsys(dir, dentry, key); | |
855 | ||
d55b4da4 | 856 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 DH |
857 | inode = afs_do_lookup(dir, dentry, key); |
858 | if (IS_ERR(inode)) { | |
859 | ret = PTR_ERR(inode); | |
4d673da1 | 860 | if (ret == -ENOENT) { |
5cf9dd55 | 861 | inode = afs_try_auto_mntpt(dentry, dir); |
4d673da1 DH |
862 | if (!IS_ERR(inode)) { |
863 | key_put(key); | |
864 | goto success; | |
865 | } | |
866 | ||
867 | ret = PTR_ERR(inode); | |
bec5eb61 | 868 | } |
869 | ||
00d3b7a4 | 870 | key_put(key); |
260a9803 DH |
871 | if (ret == -ENOENT) { |
872 | d_add(dentry, NULL); | |
873 | _leave(" = NULL [negative]"); | |
874 | return NULL; | |
875 | } | |
08e0e7c8 | 876 | _leave(" = %d [do]", ret); |
1da177e4 LT |
877 | return ERR_PTR(ret); |
878 | } | |
5cf9dd55 | 879 | dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; |
1da177e4 | 880 | |
08e0e7c8 | 881 | /* instantiate the dentry */ |
00d3b7a4 | 882 | key_put(key); |
08e0e7c8 DH |
883 | if (IS_ERR(inode)) { |
884 | _leave(" = %ld", PTR_ERR(inode)); | |
e231c2ee | 885 | return ERR_CAST(inode); |
08e0e7c8 DH |
886 | } |
887 | ||
bec5eb61 | 888 | success: |
1da177e4 | 889 | d_add(dentry, inode); |
5cf9dd55 | 890 | _leave(" = 0 { ino=%lu v=%u }", |
2b0143b5 DH |
891 | d_inode(dentry)->i_ino, |
892 | d_inode(dentry)->i_generation); | |
1da177e4 LT |
893 | |
894 | return NULL; | |
ec26815a | 895 | } |
1da177e4 | 896 | |
1da177e4 LT |
897 | /* |
898 | * check that a dentry lookup hit has found a valid entry | |
899 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
900 | * inode | |
1da177e4 | 901 | */ |
0b728e19 | 902 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 903 | { |
260a9803 | 904 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 905 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 906 | struct dentry *parent; |
c435ee34 | 907 | struct inode *inode; |
00d3b7a4 | 908 | struct key *key; |
a4ff7401 | 909 | long dir_version, de_version; |
1da177e4 LT |
910 | int ret; |
911 | ||
0b728e19 | 912 | if (flags & LOOKUP_RCU) |
34286d66 NP |
913 | return -ECHILD; |
914 | ||
c435ee34 DH |
915 | if (d_really_is_positive(dentry)) { |
916 | vnode = AFS_FS_I(d_inode(dentry)); | |
a455589f AV |
917 | _enter("{v={%x:%u} n=%pd fl=%lx},", |
918 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
260a9803 | 919 | vnode->flags); |
c435ee34 | 920 | } else { |
a455589f | 921 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 922 | } |
1da177e4 | 923 | |
260a9803 | 924 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
925 | if (IS_ERR(key)) |
926 | key = NULL; | |
927 | ||
c435ee34 DH |
928 | if (d_really_is_positive(dentry)) { |
929 | inode = d_inode(dentry); | |
930 | if (inode) { | |
931 | vnode = AFS_FS_I(inode); | |
932 | afs_validate(vnode, key); | |
933 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
934 | goto out_bad; | |
935 | } | |
936 | } | |
937 | ||
1da177e4 | 938 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 939 | parent = dget_parent(dentry); |
2b0143b5 | 940 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 941 | |
260a9803 | 942 | /* validate the parent directory */ |
c435ee34 | 943 | afs_validate(dir, key); |
260a9803 DH |
944 | |
945 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 946 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 947 | goto out_bad_parent; |
1da177e4 LT |
948 | } |
949 | ||
a4ff7401 DH |
950 | /* We only need to invalidate a dentry if the server's copy changed |
951 | * behind our back. If we made the change, it's no problem. Note that | |
952 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
953 | * version. | |
954 | */ | |
955 | dir_version = (long)dir->status.data_version; | |
956 | de_version = (long)dentry->d_fsdata; | |
957 | if (de_version == dir_version) | |
958 | goto out_valid; | |
959 | ||
960 | dir_version = (long)dir->invalid_before; | |
961 | if (de_version - dir_version >= 0) | |
962 | goto out_valid; | |
1da177e4 | 963 | |
260a9803 | 964 | _debug("dir modified"); |
d55b4da4 | 965 | afs_stat_v(dir, n_reval); |
260a9803 DH |
966 | |
967 | /* search the directory for this vnode */ | |
5cf9dd55 | 968 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
969 | switch (ret) { |
970 | case 0: | |
971 | /* the filename maps to something */ | |
2b0143b5 | 972 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
973 | goto out_bad_parent; |
974 | inode = d_inode(dentry); | |
975 | if (is_bad_inode(inode)) { | |
a455589f AV |
976 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
977 | dentry); | |
c435ee34 | 978 | goto out_bad_parent; |
1da177e4 LT |
979 | } |
980 | ||
c435ee34 DH |
981 | vnode = AFS_FS_I(inode); |
982 | ||
1da177e4 LT |
983 | /* if the vnode ID has changed, then the dirent points to a |
984 | * different file */ | |
08e0e7c8 | 985 | if (fid.vnode != vnode->fid.vnode) { |
a455589f AV |
986 | _debug("%pd: dirent changed [%u != %u]", |
987 | dentry, fid.vnode, | |
08e0e7c8 | 988 | vnode->fid.vnode); |
1da177e4 LT |
989 | goto not_found; |
990 | } | |
991 | ||
992 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
993 | * been deleted and replaced, and the original vnode ID has |
994 | * been reused */ | |
08e0e7c8 | 995 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
996 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
997 | dentry, fid.unique, | |
7a224228 | 998 | vnode->fid.unique, |
c435ee34 DH |
999 | vnode->vfs_inode.i_generation); |
1000 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1001 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1002 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1003 | goto not_found; |
1da177e4 | 1004 | } |
260a9803 | 1005 | goto out_valid; |
08e0e7c8 | 1006 | |
260a9803 DH |
1007 | case -ENOENT: |
1008 | /* the filename is unknown */ | |
a455589f | 1009 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1010 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1011 | goto not_found; |
1012 | goto out_valid; | |
1da177e4 | 1013 | |
260a9803 | 1014 | default: |
a455589f AV |
1015 | _debug("failed to iterate dir %pd: %d", |
1016 | parent, ret); | |
c435ee34 | 1017 | goto out_bad_parent; |
08e0e7c8 DH |
1018 | } |
1019 | ||
ec26815a | 1020 | out_valid: |
a4ff7401 | 1021 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1022 | dput(parent); |
00d3b7a4 | 1023 | key_put(key); |
1da177e4 LT |
1024 | _leave(" = 1 [valid]"); |
1025 | return 1; | |
1026 | ||
1027 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1028 | not_found: |
1da177e4 LT |
1029 | spin_lock(&dentry->d_lock); |
1030 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1031 | spin_unlock(&dentry->d_lock); | |
1032 | ||
c435ee34 | 1033 | out_bad_parent: |
a455589f | 1034 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1035 | dput(parent); |
c435ee34 | 1036 | out_bad: |
00d3b7a4 | 1037 | key_put(key); |
1da177e4 LT |
1038 | |
1039 | _leave(" = 0 [bad]"); | |
1040 | return 0; | |
ec26815a | 1041 | } |
1da177e4 | 1042 | |
1da177e4 LT |
1043 | /* |
1044 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1045 | * sleep) | |
1046 | * - called from dput() when d_count is going to 0. | |
1047 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1048 | */ | |
fe15ce44 | 1049 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1050 | { |
a455589f | 1051 | _enter("%pd", dentry); |
1da177e4 LT |
1052 | |
1053 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1054 | goto zap; | |
1055 | ||
2b0143b5 DH |
1056 | if (d_really_is_positive(dentry) && |
1057 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1058 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1059 | goto zap; |
1da177e4 LT |
1060 | |
1061 | _leave(" = 0 [keep]"); | |
1062 | return 0; | |
1063 | ||
ec26815a | 1064 | zap: |
1da177e4 LT |
1065 | _leave(" = 1 [zap]"); |
1066 | return 1; | |
ec26815a | 1067 | } |
260a9803 DH |
1068 | |
1069 | /* | |
1070 | * handle dentry release | |
1071 | */ | |
66c7e1d3 | 1072 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1073 | { |
a455589f | 1074 | _enter("%pd", dentry); |
260a9803 DH |
1075 | } |
1076 | ||
d2ddc776 DH |
1077 | /* |
1078 | * Create a new inode for create/mkdir/symlink | |
1079 | */ | |
1080 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1081 | struct dentry *new_dentry, | |
1082 | struct afs_fid *newfid, | |
1083 | struct afs_file_status *newstatus, | |
1084 | struct afs_callback *newcb) | |
1085 | { | |
1086 | struct inode *inode; | |
1087 | ||
1088 | if (fc->ac.error < 0) | |
1089 | return; | |
1090 | ||
bc1527dc DH |
1091 | d_drop(new_dentry); |
1092 | ||
d2ddc776 DH |
1093 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
1094 | newfid, newstatus, newcb, fc->cbi); | |
1095 | if (IS_ERR(inode)) { | |
1096 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1097 | * the new directory on the server. | |
1098 | */ | |
1099 | fc->ac.error = PTR_ERR(inode); | |
1100 | return; | |
1101 | } | |
1102 | ||
bc1527dc | 1103 | d_add(new_dentry, inode); |
d2ddc776 DH |
1104 | } |
1105 | ||
260a9803 DH |
1106 | /* |
1107 | * create a directory on an AFS filesystem | |
1108 | */ | |
18bb1db3 | 1109 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1110 | { |
d2ddc776 DH |
1111 | struct afs_file_status newstatus; |
1112 | struct afs_fs_cursor fc; | |
1113 | struct afs_callback newcb; | |
1114 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1115 | struct afs_fid newfid; | |
260a9803 DH |
1116 | struct key *key; |
1117 | int ret; | |
1118 | ||
d2ddc776 | 1119 | mode |= S_IFDIR; |
260a9803 | 1120 | |
a455589f AV |
1121 | _enter("{%x:%u},{%pd},%ho", |
1122 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1123 | |
260a9803 DH |
1124 | key = afs_request_key(dvnode->volume->cell); |
1125 | if (IS_ERR(key)) { | |
1126 | ret = PTR_ERR(key); | |
1127 | goto error; | |
1128 | } | |
1129 | ||
d2ddc776 DH |
1130 | ret = -ERESTARTSYS; |
1131 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1132 | while (afs_select_fileserver(&fc)) { | |
1133 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1134 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1135 | &newfid, &newstatus, &newcb); | |
1136 | } | |
260a9803 | 1137 | |
d2ddc776 DH |
1138 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1139 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1140 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1141 | ret = afs_end_vnode_operation(&fc); | |
1142 | if (ret < 0) | |
1143 | goto error_key; | |
4433b691 DH |
1144 | } else { |
1145 | goto error_key; | |
260a9803 DH |
1146 | } |
1147 | ||
260a9803 DH |
1148 | key_put(key); |
1149 | _leave(" = 0"); | |
1150 | return 0; | |
1151 | ||
d2ddc776 | 1152 | error_key: |
260a9803 DH |
1153 | key_put(key); |
1154 | error: | |
1155 | d_drop(dentry); | |
1156 | _leave(" = %d", ret); | |
1157 | return ret; | |
1158 | } | |
1159 | ||
d2ddc776 DH |
1160 | /* |
1161 | * Remove a subdir from a directory. | |
1162 | */ | |
1163 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1164 | { | |
1165 | if (d_really_is_positive(dentry)) { | |
1166 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1167 | ||
1168 | clear_nlink(&vnode->vfs_inode); | |
1169 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1170 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1171 | } | |
1172 | } | |
1173 | ||
260a9803 DH |
1174 | /* |
1175 | * remove a directory from an AFS filesystem | |
1176 | */ | |
1177 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1178 | { | |
d2ddc776 DH |
1179 | struct afs_fs_cursor fc; |
1180 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
260a9803 DH |
1181 | struct key *key; |
1182 | int ret; | |
1183 | ||
a455589f AV |
1184 | _enter("{%x:%u},{%pd}", |
1185 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1186 | |
260a9803 DH |
1187 | key = afs_request_key(dvnode->volume->cell); |
1188 | if (IS_ERR(key)) { | |
1189 | ret = PTR_ERR(key); | |
1190 | goto error; | |
1191 | } | |
1192 | ||
d2ddc776 DH |
1193 | ret = -ERESTARTSYS; |
1194 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1195 | while (afs_select_fileserver(&fc)) { | |
1196 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1197 | afs_fs_remove(&fc, dentry->d_name.name, true); | |
1198 | } | |
260a9803 | 1199 | |
d2ddc776 DH |
1200 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1201 | ret = afs_end_vnode_operation(&fc); | |
1202 | if (ret == 0) | |
1203 | afs_dir_remove_subdir(dentry); | |
260a9803 DH |
1204 | } |
1205 | ||
1206 | key_put(key); | |
260a9803 | 1207 | error: |
260a9803 DH |
1208 | return ret; |
1209 | } | |
1210 | ||
1211 | /* | |
d2ddc776 DH |
1212 | * Remove a link to a file or symlink from a directory. |
1213 | * | |
1214 | * If the file was not deleted due to excess hard links, the fileserver will | |
1215 | * break the callback promise on the file - if it had one - before it returns | |
1216 | * to us, and if it was deleted, it won't | |
1217 | * | |
1218 | * However, if we didn't have a callback promise outstanding, or it was | |
1219 | * outstanding on a different server, then it won't break it either... | |
1220 | */ | |
440fbc3a DH |
1221 | static int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1222 | unsigned long d_version_before, | |
1223 | unsigned long d_version_after) | |
d2ddc776 | 1224 | { |
440fbc3a | 1225 | bool dir_valid; |
d2ddc776 DH |
1226 | int ret = 0; |
1227 | ||
440fbc3a DH |
1228 | /* There were no intervening changes on the server if the version |
1229 | * number we got back was incremented by exactly 1. | |
1230 | */ | |
1231 | dir_valid = (d_version_after == d_version_before + 1); | |
1232 | ||
d2ddc776 DH |
1233 | if (d_really_is_positive(dentry)) { |
1234 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1235 | ||
440fbc3a DH |
1236 | if (dir_valid) { |
1237 | drop_nlink(&vnode->vfs_inode); | |
1238 | if (vnode->vfs_inode.i_nlink == 0) { | |
1239 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1240 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1241 | } | |
d2ddc776 | 1242 | ret = 0; |
440fbc3a DH |
1243 | } else { |
1244 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1245 | ||
1246 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1247 | kdebug("AFS_VNODE_DELETED"); | |
1248 | ||
1249 | ret = afs_validate(vnode, key); | |
1250 | if (ret == -ESTALE) | |
1251 | ret = 0; | |
1252 | } | |
d2ddc776 DH |
1253 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1254 | } | |
1255 | ||
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1261 | */ |
1262 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1263 | { | |
d2ddc776 DH |
1264 | struct afs_fs_cursor fc; |
1265 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; | |
260a9803 | 1266 | struct key *key; |
440fbc3a | 1267 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
260a9803 DH |
1268 | int ret; |
1269 | ||
a455589f AV |
1270 | _enter("{%x:%u},{%pd}", |
1271 | dvnode->fid.vid, dvnode->fid.vnode, dentry); | |
260a9803 | 1272 | |
45222b9e | 1273 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1274 | return -ENAMETOOLONG; |
260a9803 DH |
1275 | |
1276 | key = afs_request_key(dvnode->volume->cell); | |
1277 | if (IS_ERR(key)) { | |
1278 | ret = PTR_ERR(key); | |
1279 | goto error; | |
1280 | } | |
1281 | ||
d2ddc776 | 1282 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1283 | if (d_really_is_positive(dentry)) { |
1284 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1285 | ret = afs_validate(vnode, key); |
1286 | if (ret < 0) | |
d2ddc776 | 1287 | goto error_key; |
260a9803 DH |
1288 | } |
1289 | ||
d2ddc776 DH |
1290 | ret = -ERESTARTSYS; |
1291 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1292 | while (afs_select_fileserver(&fc)) { | |
1293 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1294 | afs_fs_remove(&fc, dentry->d_name.name, false); | |
1295 | } | |
260a9803 | 1296 | |
d2ddc776 DH |
1297 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1298 | ret = afs_end_vnode_operation(&fc); | |
1299 | if (ret == 0) | |
440fbc3a DH |
1300 | ret = afs_dir_remove_link( |
1301 | dentry, key, d_version, | |
1302 | (unsigned long)dvnode->status.data_version); | |
260a9803 DH |
1303 | } |
1304 | ||
d2ddc776 | 1305 | error_key: |
260a9803 DH |
1306 | key_put(key); |
1307 | error: | |
1308 | _leave(" = %d", ret); | |
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * create a regular file on an AFS filesystem | |
1314 | */ | |
4acdaf27 | 1315 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1316 | bool excl) |
260a9803 | 1317 | { |
d2ddc776 DH |
1318 | struct afs_fs_cursor fc; |
1319 | struct afs_file_status newstatus; | |
1320 | struct afs_callback newcb; | |
43dd388b | 1321 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1322 | struct afs_fid newfid; |
260a9803 DH |
1323 | struct key *key; |
1324 | int ret; | |
1325 | ||
d2ddc776 | 1326 | mode |= S_IFREG; |
260a9803 | 1327 | |
a455589f AV |
1328 | _enter("{%x:%u},{%pd},%ho,", |
1329 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); | |
260a9803 | 1330 | |
d2ddc776 DH |
1331 | ret = -ENAMETOOLONG; |
1332 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1333 | goto error; | |
1334 | ||
260a9803 DH |
1335 | key = afs_request_key(dvnode->volume->cell); |
1336 | if (IS_ERR(key)) { | |
1337 | ret = PTR_ERR(key); | |
1338 | goto error; | |
1339 | } | |
1340 | ||
d2ddc776 DH |
1341 | ret = -ERESTARTSYS; |
1342 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1343 | while (afs_select_fileserver(&fc)) { | |
1344 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1345 | afs_fs_create(&fc, dentry->d_name.name, mode, | |
1346 | &newfid, &newstatus, &newcb); | |
1347 | } | |
260a9803 | 1348 | |
d2ddc776 DH |
1349 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1350 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1351 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1352 | ret = afs_end_vnode_operation(&fc); | |
1353 | if (ret < 0) | |
1354 | goto error_key; | |
4433b691 DH |
1355 | } else { |
1356 | goto error_key; | |
260a9803 DH |
1357 | } |
1358 | ||
260a9803 DH |
1359 | key_put(key); |
1360 | _leave(" = 0"); | |
1361 | return 0; | |
1362 | ||
d2ddc776 | 1363 | error_key: |
260a9803 DH |
1364 | key_put(key); |
1365 | error: | |
1366 | d_drop(dentry); | |
1367 | _leave(" = %d", ret); | |
1368 | return ret; | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * create a hard link between files in an AFS filesystem | |
1373 | */ | |
1374 | static int afs_link(struct dentry *from, struct inode *dir, | |
1375 | struct dentry *dentry) | |
1376 | { | |
d2ddc776 | 1377 | struct afs_fs_cursor fc; |
260a9803 DH |
1378 | struct afs_vnode *dvnode, *vnode; |
1379 | struct key *key; | |
1380 | int ret; | |
1381 | ||
2b0143b5 | 1382 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 DH |
1383 | dvnode = AFS_FS_I(dir); |
1384 | ||
a455589f | 1385 | _enter("{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1386 | vnode->fid.vid, vnode->fid.vnode, |
1387 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1388 | dentry); |
260a9803 | 1389 | |
d2ddc776 DH |
1390 | ret = -ENAMETOOLONG; |
1391 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1392 | goto error; | |
1393 | ||
260a9803 DH |
1394 | key = afs_request_key(dvnode->volume->cell); |
1395 | if (IS_ERR(key)) { | |
1396 | ret = PTR_ERR(key); | |
1397 | goto error; | |
1398 | } | |
1399 | ||
d2ddc776 DH |
1400 | ret = -ERESTARTSYS; |
1401 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1402 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1403 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1404 | goto error_key; |
d2ddc776 DH |
1405 | } |
1406 | ||
1407 | while (afs_select_fileserver(&fc)) { | |
1408 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1409 | fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; | |
1410 | afs_fs_link(&fc, vnode, dentry->d_name.name); | |
1411 | } | |
1412 | ||
1413 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1414 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1415 | ihold(&vnode->vfs_inode); | |
1416 | d_instantiate(dentry, &vnode->vfs_inode); | |
1417 | ||
1418 | mutex_unlock(&vnode->io_lock); | |
1419 | ret = afs_end_vnode_operation(&fc); | |
1420 | if (ret < 0) | |
1421 | goto error_key; | |
4433b691 DH |
1422 | } else { |
1423 | goto error_key; | |
d2ddc776 | 1424 | } |
260a9803 | 1425 | |
260a9803 DH |
1426 | key_put(key); |
1427 | _leave(" = 0"); | |
1428 | return 0; | |
1429 | ||
d2ddc776 | 1430 | error_key: |
260a9803 DH |
1431 | key_put(key); |
1432 | error: | |
1433 | d_drop(dentry); | |
1434 | _leave(" = %d", ret); | |
1435 | return ret; | |
1436 | } | |
1437 | ||
1438 | /* | |
1439 | * create a symlink in an AFS filesystem | |
1440 | */ | |
1441 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1442 | const char *content) | |
1443 | { | |
d2ddc776 DH |
1444 | struct afs_fs_cursor fc; |
1445 | struct afs_file_status newstatus; | |
1446 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1447 | struct afs_fid newfid; | |
260a9803 DH |
1448 | struct key *key; |
1449 | int ret; | |
1450 | ||
a455589f AV |
1451 | _enter("{%x:%u},{%pd},%s", |
1452 | dvnode->fid.vid, dvnode->fid.vnode, dentry, | |
260a9803 DH |
1453 | content); |
1454 | ||
d2ddc776 DH |
1455 | ret = -ENAMETOOLONG; |
1456 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1457 | goto error; | |
1458 | ||
260a9803 | 1459 | ret = -EINVAL; |
45222b9e | 1460 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1461 | goto error; |
1462 | ||
1463 | key = afs_request_key(dvnode->volume->cell); | |
1464 | if (IS_ERR(key)) { | |
1465 | ret = PTR_ERR(key); | |
1466 | goto error; | |
1467 | } | |
1468 | ||
d2ddc776 DH |
1469 | ret = -ERESTARTSYS; |
1470 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1471 | while (afs_select_fileserver(&fc)) { | |
1472 | fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; | |
1473 | afs_fs_symlink(&fc, dentry->d_name.name, content, | |
1474 | &newfid, &newstatus); | |
1475 | } | |
260a9803 | 1476 | |
d2ddc776 DH |
1477 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1478 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1479 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1480 | ret = afs_end_vnode_operation(&fc); | |
1481 | if (ret < 0) | |
1482 | goto error_key; | |
4433b691 DH |
1483 | } else { |
1484 | goto error_key; | |
260a9803 DH |
1485 | } |
1486 | ||
260a9803 DH |
1487 | key_put(key); |
1488 | _leave(" = 0"); | |
1489 | return 0; | |
1490 | ||
d2ddc776 | 1491 | error_key: |
260a9803 DH |
1492 | key_put(key); |
1493 | error: | |
1494 | d_drop(dentry); | |
1495 | _leave(" = %d", ret); | |
1496 | return ret; | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * rename a file in an AFS filesystem and/or move it between directories | |
1501 | */ | |
1502 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1503 | struct inode *new_dir, struct dentry *new_dentry, |
1504 | unsigned int flags) | |
260a9803 | 1505 | { |
d2ddc776 | 1506 | struct afs_fs_cursor fc; |
260a9803 DH |
1507 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
1508 | struct key *key; | |
1509 | int ret; | |
1510 | ||
1cd66c93 MS |
1511 | if (flags) |
1512 | return -EINVAL; | |
1513 | ||
2b0143b5 | 1514 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1515 | orig_dvnode = AFS_FS_I(old_dir); |
1516 | new_dvnode = AFS_FS_I(new_dir); | |
1517 | ||
a455589f | 1518 | _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
260a9803 DH |
1519 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1520 | vnode->fid.vid, vnode->fid.vnode, | |
1521 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1522 | new_dentry); |
260a9803 | 1523 | |
260a9803 DH |
1524 | key = afs_request_key(orig_dvnode->volume->cell); |
1525 | if (IS_ERR(key)) { | |
1526 | ret = PTR_ERR(key); | |
1527 | goto error; | |
1528 | } | |
1529 | ||
d2ddc776 DH |
1530 | ret = -ERESTARTSYS; |
1531 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1532 | if (orig_dvnode != new_dvnode) { | |
1533 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1534 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1535 | goto error_key; |
d2ddc776 DH |
1536 | } |
1537 | } | |
1538 | while (afs_select_fileserver(&fc)) { | |
1539 | fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; | |
1540 | fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; | |
1541 | afs_fs_rename(&fc, old_dentry->d_name.name, | |
1542 | new_dvnode, new_dentry->d_name.name); | |
1543 | } | |
1544 | ||
1545 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1546 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1547 | if (orig_dvnode != new_dvnode) | |
1548 | mutex_unlock(&new_dvnode->io_lock); | |
1549 | ret = afs_end_vnode_operation(&fc); | |
1550 | if (ret < 0) | |
1551 | goto error_key; | |
1552 | } | |
1553 | ||
d2ddc776 | 1554 | error_key: |
260a9803 DH |
1555 | key_put(key); |
1556 | error: | |
260a9803 DH |
1557 | _leave(" = %d", ret); |
1558 | return ret; | |
1559 | } | |
f3ddee8d DH |
1560 | |
1561 | /* | |
1562 | * Release a directory page and clean up its private state if it's not busy | |
1563 | * - return true if the page can now be released, false if not | |
1564 | */ | |
1565 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1566 | { | |
1567 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1568 | ||
1569 | _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); | |
1570 | ||
1571 | set_page_private(page, 0); | |
1572 | ClearPagePrivate(page); | |
1573 | ||
1574 | /* The directory will need reloading. */ | |
1575 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1576 | afs_stat_v(dvnode, n_relpg); | |
1577 | return 1; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * invalidate part or all of a page | |
1582 | * - release a page and clean up its private data if offset is 0 (indicating | |
1583 | * the entire page) | |
1584 | */ | |
1585 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1586 | unsigned int length) | |
1587 | { | |
1588 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1589 | ||
1590 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1591 | ||
1592 | BUG_ON(!PageLocked(page)); | |
1593 | ||
1594 | /* The directory will need reloading. */ | |
1595 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1596 | afs_stat_v(dvnode, n_inval); | |
1597 | ||
1598 | /* we clean up only if the entire page is being invalidated */ | |
1599 | if (offset == 0 && length == PAGE_SIZE) { | |
1600 | set_page_private(page, 0); | |
1601 | ClearPagePrivate(page); | |
1602 | } | |
1603 | } |