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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* dir.c: AFS filesystem directory handling |
3 | * | |
f3ddee8d | 4 | * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. |
1da177e4 | 5 | * Written by David Howells (dhowells@redhat.com) |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
1da177e4 | 9 | #include <linux/fs.h> |
34286d66 | 10 | #include <linux/namei.h> |
1da177e4 | 11 | #include <linux/pagemap.h> |
f3ddee8d | 12 | #include <linux/swap.h> |
00d3b7a4 | 13 | #include <linux/ctype.h> |
e8edc6e0 | 14 | #include <linux/sched.h> |
f3ddee8d | 15 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 16 | #include "internal.h" |
a58823ac | 17 | #include "afs_fs.h" |
4ea219a8 | 18 | #include "xdr_fs.h" |
1da177e4 | 19 | |
260a9803 | 20 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 21 | unsigned int flags); |
1da177e4 | 22 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 23 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 24 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 25 | static int afs_d_delete(const struct dentry *dentry); |
79ddbfa5 | 26 | static void afs_d_iput(struct dentry *dentry, struct inode *inode); |
5cf9dd55 | 27 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 28 | loff_t fpos, u64 ino, unsigned dtype); |
5cf9dd55 DH |
29 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
30 | loff_t fpos, u64 ino, unsigned dtype); | |
4acdaf27 | 31 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 32 | bool excl); |
18bb1db3 | 33 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
34 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
35 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
36 | static int afs_link(struct dentry *from, struct inode *dir, | |
37 | struct dentry *dentry); | |
38 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
39 | const char *content); | |
40 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
41 | struct inode *new_dir, struct dentry *new_dentry, |
42 | unsigned int flags); | |
f3ddee8d DH |
43 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
44 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
45 | unsigned int length); | |
46 | ||
47 | static int afs_dir_set_page_dirty(struct page *page) | |
48 | { | |
49 | BUG(); /* This should never happen. */ | |
50 | } | |
1da177e4 | 51 | |
4b6f5d20 | 52 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 53 | .open = afs_dir_open, |
00d3b7a4 | 54 | .release = afs_release, |
29884eff | 55 | .iterate_shared = afs_readdir, |
e8d6c554 | 56 | .lock = afs_lock, |
3222a3e5 | 57 | .llseek = generic_file_llseek, |
1da177e4 LT |
58 | }; |
59 | ||
754661f1 | 60 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
61 | .create = afs_create, |
62 | .lookup = afs_lookup, | |
63 | .link = afs_link, | |
64 | .unlink = afs_unlink, | |
65 | .symlink = afs_symlink, | |
66 | .mkdir = afs_mkdir, | |
67 | .rmdir = afs_rmdir, | |
2773bf00 | 68 | .rename = afs_rename, |
00d3b7a4 | 69 | .permission = afs_permission, |
416351f2 | 70 | .getattr = afs_getattr, |
31143d5d | 71 | .setattr = afs_setattr, |
d3e3b7ea | 72 | .listxattr = afs_listxattr, |
1da177e4 LT |
73 | }; |
74 | ||
f3ddee8d DH |
75 | const struct address_space_operations afs_dir_aops = { |
76 | .set_page_dirty = afs_dir_set_page_dirty, | |
77 | .releasepage = afs_dir_releasepage, | |
78 | .invalidatepage = afs_dir_invalidatepage, | |
79 | }; | |
80 | ||
d61dcce2 | 81 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
82 | .d_revalidate = afs_d_revalidate, |
83 | .d_delete = afs_d_delete, | |
260a9803 | 84 | .d_release = afs_d_release, |
d18610b0 | 85 | .d_automount = afs_d_automount, |
79ddbfa5 | 86 | .d_iput = afs_d_iput, |
1da177e4 LT |
87 | }; |
88 | ||
5cf9dd55 DH |
89 | struct afs_lookup_one_cookie { |
90 | struct dir_context ctx; | |
91 | struct qstr name; | |
92 | bool found; | |
93 | struct afs_fid fid; | |
94 | }; | |
95 | ||
260a9803 | 96 | struct afs_lookup_cookie { |
5cf9dd55 DH |
97 | struct dir_context ctx; |
98 | struct qstr name; | |
99 | bool found; | |
100 | bool one_only; | |
101 | unsigned short nr_fids; | |
39db9815 | 102 | struct inode **inodes; |
87182759 | 103 | struct afs_status_cb *statuses; |
5cf9dd55 | 104 | struct afs_fid fids[50]; |
1da177e4 LT |
105 | }; |
106 | ||
1da177e4 LT |
107 | /* |
108 | * check that a directory page is valid | |
109 | */ | |
f3ddee8d DH |
110 | static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
111 | loff_t i_size) | |
1da177e4 | 112 | { |
00317636 | 113 | struct afs_xdr_dir_page *dbuf; |
f3ddee8d | 114 | loff_t latter, off; |
1da177e4 LT |
115 | int tmp, qty; |
116 | ||
dab17c1a DH |
117 | /* Determine how many magic numbers there should be in this page, but |
118 | * we must take care because the directory may change size under us. | |
119 | */ | |
120 | off = page_offset(page); | |
dab17c1a DH |
121 | if (i_size <= off) |
122 | goto checked; | |
123 | ||
124 | latter = i_size - off; | |
1da177e4 LT |
125 | if (latter >= PAGE_SIZE) |
126 | qty = PAGE_SIZE; | |
127 | else | |
128 | qty = latter; | |
00317636 | 129 | qty /= sizeof(union afs_xdr_dir_block); |
1da177e4 LT |
130 | |
131 | /* check them */ | |
63a4681f | 132 | dbuf = kmap(page); |
1da177e4 | 133 | for (tmp = 0; tmp < qty; tmp++) { |
00317636 | 134 | if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { |
dab17c1a | 135 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
f3ddee8d | 136 | __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
00317636 | 137 | ntohs(dbuf->blocks[tmp].hdr.magic)); |
f3ddee8d | 138 | trace_afs_dir_check_failed(dvnode, off, i_size); |
63a4681f | 139 | kunmap(page); |
f51375cd | 140 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
141 | goto error; |
142 | } | |
63a4681f DH |
143 | |
144 | /* Make sure each block is NUL terminated so we can reasonably | |
145 | * use string functions on it. The filenames in the page | |
146 | * *should* be NUL-terminated anyway. | |
147 | */ | |
148 | ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; | |
1da177e4 LT |
149 | } |
150 | ||
63a4681f DH |
151 | kunmap(page); |
152 | ||
dab17c1a | 153 | checked: |
f3ddee8d | 154 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 155 | return true; |
1da177e4 | 156 | |
ec26815a | 157 | error: |
be5b82db | 158 | return false; |
ec26815a | 159 | } |
1da177e4 | 160 | |
445b1028 DH |
161 | /* |
162 | * Check the contents of a directory that we've just read. | |
163 | */ | |
164 | static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) | |
165 | { | |
166 | struct afs_xdr_dir_page *dbuf; | |
167 | unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); | |
168 | ||
169 | for (i = 0; i < req->nr_pages; i++) | |
170 | if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) | |
171 | goto bad; | |
172 | return true; | |
173 | ||
174 | bad: | |
175 | pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", | |
176 | dvnode->fid.vid, dvnode->fid.vnode, | |
177 | req->file_size, req->len, req->actual_len, req->remain); | |
178 | pr_warn("DIR %llx %x %x %x\n", | |
179 | req->pos, req->index, req->nr_pages, req->offset); | |
180 | ||
181 | for (i = 0; i < req->nr_pages; i++) { | |
182 | dbuf = kmap(req->pages[i]); | |
183 | for (j = 0; j < qty; j++) { | |
184 | union afs_xdr_dir_block *block = &dbuf->blocks[j]; | |
185 | ||
186 | pr_warn("[%02x] %32phN\n", i * qty + j, block); | |
187 | } | |
188 | kunmap(req->pages[i]); | |
189 | } | |
190 | return false; | |
191 | } | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * open an AFS directory file | |
195 | */ | |
196 | static int afs_dir_open(struct inode *inode, struct file *file) | |
197 | { | |
198 | _enter("{%lu}", inode->i_ino); | |
199 | ||
00317636 DH |
200 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
201 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 202 | |
08e0e7c8 | 203 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
204 | return -ENOENT; |
205 | ||
00d3b7a4 | 206 | return afs_open(inode, file); |
ec26815a | 207 | } |
1da177e4 | 208 | |
f3ddee8d DH |
209 | /* |
210 | * Read the directory into the pagecache in one go, scrubbing the previous | |
211 | * contents. The list of pages is returned, pinning them so that they don't | |
212 | * get reclaimed during the iteration. | |
213 | */ | |
214 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 215 | __acquires(&dvnode->validate_lock) |
f3ddee8d DH |
216 | { |
217 | struct afs_read *req; | |
218 | loff_t i_size; | |
219 | int nr_pages, nr_inline, i, n; | |
220 | int ret = -ENOMEM; | |
221 | ||
222 | retry: | |
223 | i_size = i_size_read(&dvnode->vfs_inode); | |
224 | if (i_size < 2048) | |
f51375cd DH |
225 | return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); |
226 | if (i_size > 2048 * 1024) { | |
227 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
f3ddee8d | 228 | return ERR_PTR(-EFBIG); |
f51375cd | 229 | } |
f3ddee8d DH |
230 | |
231 | _enter("%llu", i_size); | |
232 | ||
233 | /* Get a request record to hold the page list. We want to hold it | |
234 | * inline if we can, but we don't want to make an order 1 allocation. | |
235 | */ | |
236 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
237 | nr_inline = nr_pages; | |
238 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
239 | nr_inline = 0; | |
240 | ||
241 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
242 | GFP_KERNEL); | |
243 | if (!req) | |
244 | return ERR_PTR(-ENOMEM); | |
245 | ||
246 | refcount_set(&req->usage, 1); | |
247 | req->nr_pages = nr_pages; | |
248 | req->actual_len = i_size; /* May change */ | |
249 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
250 | req->data_version = dvnode->status.data_version; /* May change */ | |
251 | if (nr_inline > 0) { | |
252 | req->pages = req->array; | |
253 | } else { | |
254 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
255 | GFP_KERNEL); | |
256 | if (!req->pages) | |
257 | goto error; | |
258 | } | |
259 | ||
260 | /* Get a list of all the pages that hold or will hold the directory | |
261 | * content. We need to fill in any gaps that we might find where the | |
262 | * memory reclaimer has been at work. If there are any gaps, we will | |
263 | * need to reread the entire directory contents. | |
264 | */ | |
265 | i = 0; | |
266 | do { | |
267 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
268 | req->nr_pages - i, | |
269 | req->pages + i); | |
270 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
271 | if (n == 0) { | |
272 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
273 | ||
274 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
275 | afs_stat_v(dvnode, n_inval); | |
276 | ||
277 | ret = -ENOMEM; | |
278 | req->pages[i] = __page_cache_alloc(gfp); | |
279 | if (!req->pages[i]) | |
280 | goto error; | |
281 | ret = add_to_page_cache_lru(req->pages[i], | |
282 | dvnode->vfs_inode.i_mapping, | |
283 | i, gfp); | |
284 | if (ret < 0) | |
285 | goto error; | |
286 | ||
287 | set_page_private(req->pages[i], 1); | |
288 | SetPagePrivate(req->pages[i]); | |
289 | unlock_page(req->pages[i]); | |
290 | i++; | |
291 | } else { | |
292 | i += n; | |
293 | } | |
294 | } while (i < req->nr_pages); | |
295 | ||
296 | /* If we're going to reload, we need to lock all the pages to prevent | |
297 | * races. | |
298 | */ | |
b61f7dcf DH |
299 | ret = -ERESTARTSYS; |
300 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
301 | goto error; | |
f3ddee8d | 302 | |
b61f7dcf DH |
303 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
304 | goto success; | |
f3ddee8d | 305 | |
b61f7dcf DH |
306 | up_read(&dvnode->validate_lock); |
307 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
308 | goto error; | |
309 | ||
310 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
99987c56 | 311 | trace_afs_reload_dir(dvnode); |
f3ddee8d DH |
312 | ret = afs_fetch_data(dvnode, key, req); |
313 | if (ret < 0) | |
b61f7dcf | 314 | goto error_unlock; |
f3ddee8d DH |
315 | |
316 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
317 | ||
318 | if (req->len < req->file_size) | |
319 | goto content_has_grown; | |
320 | ||
321 | /* Validate the data we just read. */ | |
322 | ret = -EIO; | |
445b1028 DH |
323 | if (!afs_dir_check_pages(dvnode, req)) |
324 | goto error_unlock; | |
f3ddee8d DH |
325 | |
326 | // TODO: Trim excess pages | |
327 | ||
328 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
329 | } | |
330 | ||
b61f7dcf | 331 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 332 | success: |
f3ddee8d DH |
333 | return req; |
334 | ||
f3ddee8d | 335 | error_unlock: |
b61f7dcf | 336 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
337 | error: |
338 | afs_put_read(req); | |
339 | _leave(" = %d", ret); | |
340 | return ERR_PTR(ret); | |
341 | ||
342 | content_has_grown: | |
b61f7dcf | 343 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
344 | afs_put_read(req); |
345 | goto retry; | |
346 | } | |
347 | ||
1da177e4 LT |
348 | /* |
349 | * deal with one block in an AFS directory | |
350 | */ | |
f51375cd DH |
351 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
352 | struct dir_context *ctx, | |
00317636 | 353 | union afs_xdr_dir_block *block, |
1bbae9f8 | 354 | unsigned blkoff) |
1da177e4 | 355 | { |
00317636 | 356 | union afs_xdr_dirent *dire; |
1da177e4 LT |
357 | unsigned offset, next, curr; |
358 | size_t nlen; | |
1bbae9f8 | 359 | int tmp; |
1da177e4 | 360 | |
1bbae9f8 | 361 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 362 | |
00317636 | 363 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
364 | |
365 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
366 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
367 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
368 | offset = next |
369 | ) { | |
370 | next = offset + 1; | |
371 | ||
372 | /* skip entries marked unused in the bitmap */ | |
00317636 | 373 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 374 | (1 << (offset % 8)))) { |
5b5e0928 | 375 | _debug("ENT[%zu.%u]: unused", |
00317636 | 376 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 377 | if (offset >= curr) |
1bbae9f8 | 378 | ctx->pos = blkoff + |
00317636 | 379 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
380 | continue; |
381 | } | |
382 | ||
383 | /* got a valid entry */ | |
384 | dire = &block->dirents[offset]; | |
385 | nlen = strnlen(dire->u.name, | |
386 | sizeof(*block) - | |
00317636 | 387 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 388 | |
5b5e0928 | 389 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 390 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
391 | (offset < curr ? "skip" : "fill"), |
392 | nlen, dire->u.name); | |
393 | ||
394 | /* work out where the next possible entry is */ | |
00317636 | 395 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 396 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 397 | _debug("ENT[%zu.%u]:" |
1da177e4 | 398 | " %u travelled beyond end dir block" |
5b5e0928 | 399 | " (len %u/%zu)", |
00317636 | 400 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 401 | offset, next, tmp, nlen); |
f51375cd | 402 | return afs_bad(dvnode, afs_file_error_dir_over_end); |
1da177e4 | 403 | } |
00317636 | 404 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 405 | (1 << (next % 8)))) { |
5b5e0928 AD |
406 | _debug("ENT[%zu.%u]:" |
407 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 408 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 409 | offset, next, tmp, nlen); |
f51375cd | 410 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 LT |
411 | } |
412 | ||
5b5e0928 | 413 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 414 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
415 | next, tmp, nlen); |
416 | next++; | |
417 | } | |
418 | ||
419 | /* skip if starts before the current position */ | |
420 | if (offset < curr) | |
421 | continue; | |
422 | ||
423 | /* found the next entry */ | |
1bbae9f8 | 424 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 425 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
426 | (ctx->actor == afs_lookup_filldir || |
427 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 428 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
429 | _leave(" = 0 [full]"); |
430 | return 0; | |
431 | } | |
432 | ||
00317636 | 433 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
434 | } |
435 | ||
436 | _leave(" = 1 [more]"); | |
437 | return 1; | |
ec26815a | 438 | } |
1da177e4 | 439 | |
1da177e4 | 440 | /* |
08e0e7c8 | 441 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 442 | */ |
1bbae9f8 AV |
443 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
444 | struct key *key) | |
1da177e4 | 445 | { |
f3ddee8d | 446 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
447 | struct afs_xdr_dir_page *dbuf; |
448 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 449 | struct afs_read *req; |
1da177e4 LT |
450 | struct page *page; |
451 | unsigned blkoff, limit; | |
452 | int ret; | |
453 | ||
1bbae9f8 | 454 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 455 | |
08e0e7c8 | 456 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
457 | _leave(" = -ESTALE"); |
458 | return -ESTALE; | |
459 | } | |
460 | ||
f3ddee8d DH |
461 | req = afs_read_dir(dvnode, key); |
462 | if (IS_ERR(req)) | |
463 | return PTR_ERR(req); | |
464 | ||
1da177e4 | 465 | /* round the file position up to the next entry boundary */ |
00317636 DH |
466 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
467 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
468 | |
469 | /* walk through the blocks in sequence */ | |
470 | ret = 0; | |
f3ddee8d | 471 | while (ctx->pos < req->actual_len) { |
00317636 | 472 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 473 | |
f3ddee8d DH |
474 | /* Fetch the appropriate page from the directory and re-add it |
475 | * to the LRU. | |
476 | */ | |
477 | page = req->pages[blkoff / PAGE_SIZE]; | |
478 | if (!page) { | |
f51375cd | 479 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
480 | break; |
481 | } | |
f3ddee8d | 482 | mark_page_accessed(page); |
1da177e4 LT |
483 | |
484 | limit = blkoff & ~(PAGE_SIZE - 1); | |
485 | ||
f3ddee8d | 486 | dbuf = kmap(page); |
1da177e4 LT |
487 | |
488 | /* deal with the individual blocks stashed on this page */ | |
489 | do { | |
490 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 491 | sizeof(union afs_xdr_dir_block)]; |
f51375cd | 492 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); |
1da177e4 | 493 | if (ret != 1) { |
f3ddee8d | 494 | kunmap(page); |
1da177e4 LT |
495 | goto out; |
496 | } | |
497 | ||
00317636 | 498 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 499 | |
1bbae9f8 | 500 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 501 | |
f3ddee8d | 502 | kunmap(page); |
1da177e4 LT |
503 | ret = 0; |
504 | } | |
505 | ||
ec26815a | 506 | out: |
b61f7dcf | 507 | up_read(&dvnode->validate_lock); |
f3ddee8d | 508 | afs_put_read(req); |
1da177e4 LT |
509 | _leave(" = %d", ret); |
510 | return ret; | |
ec26815a | 511 | } |
1da177e4 | 512 | |
1da177e4 LT |
513 | /* |
514 | * read an AFS directory | |
515 | */ | |
1bbae9f8 | 516 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 517 | { |
215804a9 | 518 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 519 | } |
1da177e4 | 520 | |
1da177e4 | 521 | /* |
5cf9dd55 | 522 | * Search the directory for a single name |
1da177e4 LT |
523 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
524 | * uniquifier through dtype | |
525 | */ | |
5cf9dd55 DH |
526 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
527 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 528 | { |
5cf9dd55 DH |
529 | struct afs_lookup_one_cookie *cookie = |
530 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 531 | |
1bbae9f8 AV |
532 | _enter("{%s,%u},%s,%u,,%llu,%u", |
533 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 534 | (unsigned long long) ino, dtype); |
1da177e4 | 535 | |
08e0e7c8 | 536 | /* insanity checks first */ |
00317636 DH |
537 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
538 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 539 | |
1bbae9f8 AV |
540 | if (cookie->name.len != nlen || |
541 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
542 | _leave(" = 0 [no]"); |
543 | return 0; | |
544 | } | |
545 | ||
546 | cookie->fid.vnode = ino; | |
547 | cookie->fid.unique = dtype; | |
548 | cookie->found = 1; | |
549 | ||
550 | _leave(" = -1 [found]"); | |
551 | return -1; | |
ec26815a | 552 | } |
1da177e4 | 553 | |
1da177e4 | 554 | /* |
5cf9dd55 | 555 | * Do a lookup of a single name in a directory |
260a9803 | 556 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 557 | */ |
5cf9dd55 DH |
558 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
559 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 560 | { |
1bbae9f8 | 561 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
562 | struct afs_lookup_one_cookie cookie = { |
563 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
564 | .name = dentry->d_name, |
565 | .fid.vid = as->volume->vid | |
566 | }; | |
1da177e4 LT |
567 | int ret; |
568 | ||
a455589f | 569 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 570 | |
1da177e4 | 571 | /* search the directory */ |
1bbae9f8 | 572 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 573 | if (ret < 0) { |
08e0e7c8 DH |
574 | _leave(" = %d [iter]", ret); |
575 | return ret; | |
1da177e4 LT |
576 | } |
577 | ||
578 | ret = -ENOENT; | |
579 | if (!cookie.found) { | |
08e0e7c8 DH |
580 | _leave(" = -ENOENT [not found]"); |
581 | return -ENOENT; | |
1da177e4 LT |
582 | } |
583 | ||
08e0e7c8 | 584 | *fid = cookie.fid; |
3b6492df | 585 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
586 | return 0; |
587 | } | |
588 | ||
5cf9dd55 DH |
589 | /* |
590 | * search the directory for a name | |
591 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
592 | * uniquifier through dtype | |
593 | */ | |
594 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
595 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
596 | { | |
597 | struct afs_lookup_cookie *cookie = | |
598 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
599 | int ret; | |
600 | ||
601 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
602 | cookie->name.name, cookie->name.len, name, nlen, | |
603 | (unsigned long long) ino, dtype); | |
604 | ||
605 | /* insanity checks first */ | |
00317636 DH |
606 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
607 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
608 | |
609 | if (cookie->found) { | |
610 | if (cookie->nr_fids < 50) { | |
611 | cookie->fids[cookie->nr_fids].vnode = ino; | |
612 | cookie->fids[cookie->nr_fids].unique = dtype; | |
613 | cookie->nr_fids++; | |
614 | } | |
615 | } else if (cookie->name.len == nlen && | |
616 | memcmp(cookie->name.name, name, nlen) == 0) { | |
617 | cookie->fids[0].vnode = ino; | |
618 | cookie->fids[0].unique = dtype; | |
619 | cookie->found = 1; | |
620 | if (cookie->one_only) | |
621 | return -1; | |
622 | } | |
623 | ||
624 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
625 | _leave(" = %d", ret); | |
626 | return ret; | |
627 | } | |
628 | ||
629 | /* | |
630 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
631 | * files in one go and create inodes for them. The inode of the file we were | |
632 | * asked for is returned. | |
633 | */ | |
634 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
635 | struct key *key) | |
636 | { | |
637 | struct afs_lookup_cookie *cookie; | |
f642404a | 638 | struct afs_cb_interest *dcbi, *cbi = NULL; |
5cf9dd55 | 639 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
87182759 | 640 | struct afs_status_cb *scb; |
b8359153 | 641 | struct afs_iget_data iget_data; |
5cf9dd55 | 642 | struct afs_fs_cursor fc; |
f642404a | 643 | struct afs_server *server; |
39db9815 DH |
644 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; |
645 | struct inode *inode = NULL, *ti; | |
5cf9dd55 DH |
646 | int ret, i; |
647 | ||
648 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
649 | ||
650 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
651 | if (!cookie) | |
652 | return ERR_PTR(-ENOMEM); | |
653 | ||
654 | cookie->ctx.actor = afs_lookup_filldir; | |
655 | cookie->name = dentry->d_name; | |
656 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
657 | ||
658 | read_seqlock_excl(&dvnode->cb_lock); | |
f642404a DH |
659 | dcbi = rcu_dereference_protected(dvnode->cb_interest, |
660 | lockdep_is_held(&dvnode->cb_lock.lock)); | |
661 | if (dcbi) { | |
662 | server = dcbi->server; | |
663 | if (server && | |
664 | test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) | |
665 | cookie->one_only = true; | |
666 | } | |
5cf9dd55 DH |
667 | read_sequnlock_excl(&dvnode->cb_lock); |
668 | ||
669 | for (i = 0; i < 50; i++) | |
670 | cookie->fids[i].vid = as->volume->vid; | |
671 | ||
672 | /* search the directory */ | |
673 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
674 | if (ret < 0) { | |
675 | inode = ERR_PTR(ret); | |
676 | goto out; | |
677 | } | |
678 | ||
679 | inode = ERR_PTR(-ENOENT); | |
680 | if (!cookie->found) | |
681 | goto out; | |
682 | ||
683 | /* Check to see if we already have an inode for the primary fid. */ | |
b8359153 DH |
684 | iget_data.fid = cookie->fids[0]; |
685 | iget_data.volume = dvnode->volume; | |
686 | iget_data.cb_v_break = dvnode->volume->cb_v_break; | |
687 | iget_data.cb_s_break = 0; | |
688 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, | |
689 | afs_iget5_test, &iget_data); | |
5cf9dd55 DH |
690 | if (inode) |
691 | goto out; | |
692 | ||
693 | /* Need space for examining all the selected files */ | |
694 | inode = ERR_PTR(-ENOMEM); | |
87182759 DH |
695 | cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb), |
696 | GFP_KERNEL); | |
5cf9dd55 DH |
697 | if (!cookie->statuses) |
698 | goto out; | |
699 | ||
39db9815 DH |
700 | cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *), |
701 | GFP_KERNEL); | |
702 | if (!cookie->inodes) | |
703 | goto out_s; | |
704 | ||
705 | for (i = 1; i < cookie->nr_fids; i++) { | |
706 | scb = &cookie->statuses[i]; | |
707 | ||
708 | /* Find any inodes that already exist and get their | |
709 | * callback counters. | |
710 | */ | |
711 | iget_data.fid = cookie->fids[i]; | |
712 | ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode, | |
713 | afs_iget5_test, &iget_data); | |
714 | if (!IS_ERR_OR_NULL(ti)) { | |
715 | vnode = AFS_FS_I(ti); | |
716 | scb->cb_break = afs_calc_vnode_cb_break(vnode); | |
717 | cookie->inodes[i] = ti; | |
718 | } | |
719 | } | |
720 | ||
5cf9dd55 DH |
721 | /* Try FS.InlineBulkStatus first. Abort codes for the individual |
722 | * lookups contained therein are stored in the reply without aborting | |
723 | * the whole operation. | |
724 | */ | |
725 | if (cookie->one_only) | |
726 | goto no_inline_bulk_status; | |
727 | ||
728 | inode = ERR_PTR(-ERESTARTSYS); | |
20b8391f | 729 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
5cf9dd55 DH |
730 | while (afs_select_fileserver(&fc)) { |
731 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
732 | &fc.cbi->server->flags)) { | |
733 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
734 | fc.ac.error = -ECONNABORTED; | |
735 | break; | |
736 | } | |
b8359153 DH |
737 | iget_data.cb_v_break = dvnode->volume->cb_v_break; |
738 | iget_data.cb_s_break = fc.cbi->server->cb_s_break; | |
5cf9dd55 DH |
739 | afs_fs_inline_bulk_status(&fc, |
740 | afs_v2net(dvnode), | |
741 | cookie->fids, | |
742 | cookie->statuses, | |
5cf9dd55 DH |
743 | cookie->nr_fids, NULL); |
744 | } | |
745 | ||
746 | if (fc.ac.error == 0) | |
747 | cbi = afs_get_cb_interest(fc.cbi); | |
748 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
749 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
750 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
751 | } | |
752 | ||
753 | if (!IS_ERR(inode)) | |
754 | goto success; | |
755 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
756 | goto out_c; | |
757 | ||
758 | no_inline_bulk_status: | |
759 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
760 | * any of the lookups fails - so, for the moment, revert to | |
761 | * FS.FetchStatus for just the primary fid. | |
762 | */ | |
5cf9dd55 | 763 | inode = ERR_PTR(-ERESTARTSYS); |
20b8391f | 764 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
5cf9dd55 | 765 | while (afs_select_fileserver(&fc)) { |
b8359153 DH |
766 | iget_data.cb_v_break = dvnode->volume->cb_v_break; |
767 | iget_data.cb_s_break = fc.cbi->server->cb_s_break; | |
87182759 | 768 | scb = &cookie->statuses[0]; |
5cf9dd55 DH |
769 | afs_fs_fetch_status(&fc, |
770 | afs_v2net(dvnode), | |
771 | cookie->fids, | |
a58823ac | 772 | scb, |
5cf9dd55 DH |
773 | NULL); |
774 | } | |
775 | ||
776 | if (fc.ac.error == 0) | |
777 | cbi = afs_get_cb_interest(fc.cbi); | |
778 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
779 | } | |
780 | ||
781 | if (IS_ERR(inode)) | |
782 | goto out_c; | |
783 | ||
5cf9dd55 DH |
784 | success: |
785 | /* Turn all the files into inodes and save the first one - which is the | |
786 | * one we actually want. | |
787 | */ | |
87182759 DH |
788 | scb = &cookie->statuses[0]; |
789 | if (scb->status.abort_code != 0) | |
790 | inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code)); | |
5cf9dd55 DH |
791 | |
792 | for (i = 0; i < cookie->nr_fids; i++) { | |
87182759 | 793 | struct afs_status_cb *scb = &cookie->statuses[i]; |
39db9815 DH |
794 | |
795 | if (!scb->have_status && !scb->have_error) | |
796 | continue; | |
797 | ||
798 | if (cookie->inodes[i]) { | |
799 | afs_vnode_commit_status(&fc, AFS_FS_I(cookie->inodes[i]), | |
800 | scb->cb_break, NULL, scb); | |
801 | continue; | |
802 | } | |
5cf9dd55 | 803 | |
87182759 | 804 | if (scb->status.abort_code != 0) |
5cf9dd55 DH |
805 | continue; |
806 | ||
b8359153 DH |
807 | iget_data.fid = cookie->fids[i]; |
808 | ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode); | |
39db9815 DH |
809 | if (!IS_ERR(ti)) |
810 | afs_cache_permit(AFS_FS_I(ti), key, | |
811 | 0 /* Assume vnode->cb_break is 0 */ + | |
812 | iget_data.cb_v_break, | |
813 | scb); | |
5cf9dd55 DH |
814 | if (i == 0) { |
815 | inode = ti; | |
816 | } else { | |
817 | if (!IS_ERR(ti)) | |
818 | iput(ti); | |
819 | } | |
820 | } | |
821 | ||
822 | out_c: | |
823 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
39db9815 DH |
824 | if (cookie->inodes) { |
825 | for (i = 0; i < cookie->nr_fids; i++) | |
826 | iput(cookie->inodes[i]); | |
827 | kfree(cookie->inodes); | |
828 | } | |
829 | out_s: | |
87182759 | 830 | kvfree(cookie->statuses); |
5cf9dd55 DH |
831 | out: |
832 | kfree(cookie); | |
833 | return inode; | |
834 | } | |
835 | ||
6f8880d8 DH |
836 | /* |
837 | * Look up an entry in a directory with @sys substitution. | |
838 | */ | |
839 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
840 | struct key *key) | |
841 | { | |
842 | struct afs_sysnames *subs; | |
843 | struct afs_net *net = afs_i2net(dir); | |
844 | struct dentry *ret; | |
845 | char *buf, *p, *name; | |
846 | int len, i; | |
847 | ||
848 | _enter(""); | |
849 | ||
850 | ret = ERR_PTR(-ENOMEM); | |
851 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
852 | if (!buf) | |
853 | goto out_p; | |
854 | if (dentry->d_name.len > 4) { | |
855 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
856 | p += dentry->d_name.len - 4; | |
857 | } | |
858 | ||
859 | /* There is an ordered list of substitutes that we have to try. */ | |
860 | read_lock(&net->sysnames_lock); | |
861 | subs = net->sysnames; | |
862 | refcount_inc(&subs->usage); | |
863 | read_unlock(&net->sysnames_lock); | |
864 | ||
865 | for (i = 0; i < subs->nr; i++) { | |
866 | name = subs->subs[i]; | |
867 | len = dentry->d_name.len - 4 + strlen(name); | |
868 | if (len >= AFSNAMEMAX) { | |
869 | ret = ERR_PTR(-ENAMETOOLONG); | |
870 | goto out_s; | |
871 | } | |
872 | ||
873 | strcpy(p, name); | |
874 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
875 | if (IS_ERR(ret) || d_is_positive(ret)) | |
876 | goto out_s; | |
877 | dput(ret); | |
878 | } | |
879 | ||
880 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
881 | * the cached dentry to hide changes to the sysnames list. | |
882 | */ | |
883 | ret = NULL; | |
884 | out_s: | |
885 | afs_put_sysnames(subs); | |
886 | kfree(buf); | |
887 | out_p: | |
888 | key_put(key); | |
889 | return ret; | |
890 | } | |
891 | ||
08e0e7c8 DH |
892 | /* |
893 | * look up an entry in a directory | |
894 | */ | |
260a9803 | 895 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 896 | unsigned int flags) |
08e0e7c8 | 897 | { |
5cf9dd55 | 898 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 899 | struct inode *inode; |
34b2a88f | 900 | struct dentry *d; |
00d3b7a4 | 901 | struct key *key; |
08e0e7c8 DH |
902 | int ret; |
903 | ||
3b6492df | 904 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 905 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 906 | |
2b0143b5 | 907 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 908 | |
45222b9e | 909 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
910 | _leave(" = -ENAMETOOLONG"); |
911 | return ERR_PTR(-ENAMETOOLONG); | |
912 | } | |
913 | ||
5cf9dd55 | 914 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
915 | _leave(" = -ESTALE"); |
916 | return ERR_PTR(-ESTALE); | |
917 | } | |
918 | ||
5cf9dd55 | 919 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
920 | if (IS_ERR(key)) { |
921 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 922 | return ERR_CAST(key); |
00d3b7a4 DH |
923 | } |
924 | ||
5cf9dd55 | 925 | ret = afs_validate(dvnode, key); |
260a9803 DH |
926 | if (ret < 0) { |
927 | key_put(key); | |
928 | _leave(" = %d [val]", ret); | |
929 | return ERR_PTR(ret); | |
930 | } | |
931 | ||
6f8880d8 DH |
932 | if (dentry->d_name.len >= 4 && |
933 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
934 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
935 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
936 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
937 | return afs_lookup_atsys(dir, dentry, key); | |
938 | ||
d55b4da4 | 939 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 940 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 941 | key_put(key); |
34b2a88f AV |
942 | if (inode == ERR_PTR(-ENOENT)) { |
943 | inode = afs_try_auto_mntpt(dentry, dir); | |
34b2a88f AV |
944 | } else { |
945 | dentry->d_fsdata = | |
946 | (void *)(unsigned long)dvnode->status.data_version; | |
08e0e7c8 | 947 | } |
34b2a88f | 948 | d = d_splice_alias(inode, dentry); |
80548b03 | 949 | if (!IS_ERR_OR_NULL(d)) { |
34b2a88f | 950 | d->d_fsdata = dentry->d_fsdata; |
80548b03 DH |
951 | trace_afs_lookup(dvnode, &d->d_name, |
952 | inode ? AFS_FS_I(inode) : NULL); | |
953 | } else { | |
954 | trace_afs_lookup(dvnode, &dentry->d_name, | |
955 | inode ? AFS_FS_I(inode) : NULL); | |
956 | } | |
34b2a88f | 957 | return d; |
ec26815a | 958 | } |
1da177e4 | 959 | |
1da177e4 LT |
960 | /* |
961 | * check that a dentry lookup hit has found a valid entry | |
962 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
963 | * inode | |
1da177e4 | 964 | */ |
0b728e19 | 965 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 966 | { |
260a9803 | 967 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 968 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 969 | struct dentry *parent; |
c435ee34 | 970 | struct inode *inode; |
00d3b7a4 | 971 | struct key *key; |
a4ff7401 | 972 | long dir_version, de_version; |
1da177e4 LT |
973 | int ret; |
974 | ||
0b728e19 | 975 | if (flags & LOOKUP_RCU) |
34286d66 NP |
976 | return -ECHILD; |
977 | ||
c435ee34 DH |
978 | if (d_really_is_positive(dentry)) { |
979 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 980 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 981 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 982 | vnode->flags); |
c435ee34 | 983 | } else { |
a455589f | 984 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 985 | } |
1da177e4 | 986 | |
260a9803 | 987 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
988 | if (IS_ERR(key)) |
989 | key = NULL; | |
990 | ||
c435ee34 DH |
991 | if (d_really_is_positive(dentry)) { |
992 | inode = d_inode(dentry); | |
993 | if (inode) { | |
994 | vnode = AFS_FS_I(inode); | |
995 | afs_validate(vnode, key); | |
996 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
997 | goto out_bad; | |
998 | } | |
999 | } | |
1000 | ||
1da177e4 | 1001 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 1002 | parent = dget_parent(dentry); |
2b0143b5 | 1003 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 1004 | |
260a9803 | 1005 | /* validate the parent directory */ |
c435ee34 | 1006 | afs_validate(dir, key); |
260a9803 DH |
1007 | |
1008 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 1009 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 1010 | goto out_bad_parent; |
1da177e4 LT |
1011 | } |
1012 | ||
a4ff7401 DH |
1013 | /* We only need to invalidate a dentry if the server's copy changed |
1014 | * behind our back. If we made the change, it's no problem. Note that | |
1015 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1016 | * version. | |
1017 | */ | |
1018 | dir_version = (long)dir->status.data_version; | |
1019 | de_version = (long)dentry->d_fsdata; | |
1020 | if (de_version == dir_version) | |
1021 | goto out_valid; | |
1022 | ||
1023 | dir_version = (long)dir->invalid_before; | |
1024 | if (de_version - dir_version >= 0) | |
1025 | goto out_valid; | |
1da177e4 | 1026 | |
260a9803 | 1027 | _debug("dir modified"); |
d55b4da4 | 1028 | afs_stat_v(dir, n_reval); |
260a9803 DH |
1029 | |
1030 | /* search the directory for this vnode */ | |
5cf9dd55 | 1031 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
1032 | switch (ret) { |
1033 | case 0: | |
1034 | /* the filename maps to something */ | |
2b0143b5 | 1035 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
1036 | goto out_bad_parent; |
1037 | inode = d_inode(dentry); | |
1038 | if (is_bad_inode(inode)) { | |
a455589f AV |
1039 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
1040 | dentry); | |
c435ee34 | 1041 | goto out_bad_parent; |
1da177e4 LT |
1042 | } |
1043 | ||
c435ee34 DH |
1044 | vnode = AFS_FS_I(inode); |
1045 | ||
1da177e4 LT |
1046 | /* if the vnode ID has changed, then the dirent points to a |
1047 | * different file */ | |
08e0e7c8 | 1048 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 1049 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 1050 | dentry, fid.vnode, |
08e0e7c8 | 1051 | vnode->fid.vnode); |
1da177e4 LT |
1052 | goto not_found; |
1053 | } | |
1054 | ||
1055 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1056 | * been deleted and replaced, and the original vnode ID has |
1057 | * been reused */ | |
08e0e7c8 | 1058 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1059 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1060 | dentry, fid.unique, | |
7a224228 | 1061 | vnode->fid.unique, |
c435ee34 DH |
1062 | vnode->vfs_inode.i_generation); |
1063 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1064 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1065 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1066 | goto not_found; |
1da177e4 | 1067 | } |
260a9803 | 1068 | goto out_valid; |
08e0e7c8 | 1069 | |
260a9803 DH |
1070 | case -ENOENT: |
1071 | /* the filename is unknown */ | |
a455589f | 1072 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1073 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1074 | goto not_found; |
1075 | goto out_valid; | |
1da177e4 | 1076 | |
260a9803 | 1077 | default: |
a455589f AV |
1078 | _debug("failed to iterate dir %pd: %d", |
1079 | parent, ret); | |
c435ee34 | 1080 | goto out_bad_parent; |
08e0e7c8 DH |
1081 | } |
1082 | ||
ec26815a | 1083 | out_valid: |
a4ff7401 | 1084 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1085 | dput(parent); |
00d3b7a4 | 1086 | key_put(key); |
1da177e4 LT |
1087 | _leave(" = 1 [valid]"); |
1088 | return 1; | |
1089 | ||
1090 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1091 | not_found: |
1da177e4 LT |
1092 | spin_lock(&dentry->d_lock); |
1093 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1094 | spin_unlock(&dentry->d_lock); | |
1095 | ||
c435ee34 | 1096 | out_bad_parent: |
a455589f | 1097 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1098 | dput(parent); |
c435ee34 | 1099 | out_bad: |
00d3b7a4 | 1100 | key_put(key); |
1da177e4 LT |
1101 | |
1102 | _leave(" = 0 [bad]"); | |
1103 | return 0; | |
ec26815a | 1104 | } |
1da177e4 | 1105 | |
1da177e4 LT |
1106 | /* |
1107 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1108 | * sleep) | |
1109 | * - called from dput() when d_count is going to 0. | |
1110 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1111 | */ | |
fe15ce44 | 1112 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1113 | { |
a455589f | 1114 | _enter("%pd", dentry); |
1da177e4 LT |
1115 | |
1116 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1117 | goto zap; | |
1118 | ||
2b0143b5 DH |
1119 | if (d_really_is_positive(dentry) && |
1120 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1121 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1122 | goto zap; |
1da177e4 LT |
1123 | |
1124 | _leave(" = 0 [keep]"); | |
1125 | return 0; | |
1126 | ||
ec26815a | 1127 | zap: |
1da177e4 LT |
1128 | _leave(" = 1 [zap]"); |
1129 | return 1; | |
ec26815a | 1130 | } |
260a9803 | 1131 | |
79ddbfa5 DH |
1132 | /* |
1133 | * Clean up sillyrename files on dentry removal. | |
1134 | */ | |
1135 | static void afs_d_iput(struct dentry *dentry, struct inode *inode) | |
1136 | { | |
1137 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1138 | afs_silly_iput(dentry, inode); | |
1139 | iput(inode); | |
1140 | } | |
1141 | ||
260a9803 DH |
1142 | /* |
1143 | * handle dentry release | |
1144 | */ | |
66c7e1d3 | 1145 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1146 | { |
a455589f | 1147 | _enter("%pd", dentry); |
260a9803 DH |
1148 | } |
1149 | ||
d2ddc776 DH |
1150 | /* |
1151 | * Create a new inode for create/mkdir/symlink | |
1152 | */ | |
1153 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1154 | struct dentry *new_dentry, | |
b8359153 | 1155 | struct afs_iget_data *new_data, |
a58823ac | 1156 | struct afs_status_cb *new_scb) |
d2ddc776 | 1157 | { |
5a813276 | 1158 | struct afs_vnode *vnode; |
d2ddc776 DH |
1159 | struct inode *inode; |
1160 | ||
1161 | if (fc->ac.error < 0) | |
1162 | return; | |
1163 | ||
1164 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, | |
b8359153 | 1165 | new_data, new_scb, fc->cbi, fc->vnode); |
d2ddc776 DH |
1166 | if (IS_ERR(inode)) { |
1167 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1168 | * the new directory on the server. | |
1169 | */ | |
1170 | fc->ac.error = PTR_ERR(inode); | |
1171 | return; | |
1172 | } | |
1173 | ||
5a813276 DH |
1174 | vnode = AFS_FS_I(inode); |
1175 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
a58823ac DH |
1176 | if (fc->ac.error == 0) |
1177 | afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb); | |
73116df7 | 1178 | d_instantiate(new_dentry, inode); |
d2ddc776 DH |
1179 | } |
1180 | ||
b8359153 DH |
1181 | static void afs_prep_for_new_inode(struct afs_fs_cursor *fc, |
1182 | struct afs_iget_data *iget_data) | |
1183 | { | |
1184 | iget_data->volume = fc->vnode->volume; | |
1185 | iget_data->cb_v_break = fc->vnode->volume->cb_v_break; | |
1186 | iget_data->cb_s_break = fc->cbi->server->cb_s_break; | |
1187 | } | |
1188 | ||
260a9803 DH |
1189 | /* |
1190 | * create a directory on an AFS filesystem | |
1191 | */ | |
18bb1db3 | 1192 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1193 | { |
b8359153 | 1194 | struct afs_iget_data iget_data; |
a58823ac | 1195 | struct afs_status_cb *scb; |
d2ddc776 | 1196 | struct afs_fs_cursor fc; |
d2ddc776 | 1197 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1198 | struct key *key; |
1199 | int ret; | |
1200 | ||
d2ddc776 | 1201 | mode |= S_IFDIR; |
260a9803 | 1202 | |
3b6492df | 1203 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1204 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1205 | |
a58823ac DH |
1206 | ret = -ENOMEM; |
1207 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1208 | if (!scb) | |
1209 | goto error; | |
1210 | ||
260a9803 DH |
1211 | key = afs_request_key(dvnode->volume->cell); |
1212 | if (IS_ERR(key)) { | |
1213 | ret = PTR_ERR(key); | |
a58823ac | 1214 | goto error_scb; |
260a9803 DH |
1215 | } |
1216 | ||
d2ddc776 | 1217 | ret = -ERESTARTSYS; |
20b8391f | 1218 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac DH |
1219 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
1220 | ||
d2ddc776 | 1221 | while (afs_select_fileserver(&fc)) { |
68251f0a | 1222 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
b8359153 | 1223 | afs_prep_for_new_inode(&fc, &iget_data); |
a58823ac | 1224 | afs_fs_create(&fc, dentry->d_name.name, mode, |
b8359153 | 1225 | &scb[0], &iget_data.fid, &scb[1]); |
d2ddc776 | 1226 | } |
260a9803 | 1227 | |
a58823ac DH |
1228 | afs_check_for_remote_deletion(&fc, dvnode); |
1229 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, | |
1230 | &data_version, &scb[0]); | |
b8359153 | 1231 | afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); |
d2ddc776 DH |
1232 | ret = afs_end_vnode_operation(&fc); |
1233 | if (ret < 0) | |
1234 | goto error_key; | |
4433b691 DH |
1235 | } else { |
1236 | goto error_key; | |
260a9803 DH |
1237 | } |
1238 | ||
63a4681f DH |
1239 | if (ret == 0 && |
1240 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
b8359153 | 1241 | afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, |
63a4681f DH |
1242 | afs_edit_dir_for_create); |
1243 | ||
260a9803 | 1244 | key_put(key); |
a58823ac | 1245 | kfree(scb); |
260a9803 DH |
1246 | _leave(" = 0"); |
1247 | return 0; | |
1248 | ||
d2ddc776 | 1249 | error_key: |
260a9803 | 1250 | key_put(key); |
a58823ac DH |
1251 | error_scb: |
1252 | kfree(scb); | |
260a9803 DH |
1253 | error: |
1254 | d_drop(dentry); | |
1255 | _leave(" = %d", ret); | |
1256 | return ret; | |
1257 | } | |
1258 | ||
d2ddc776 DH |
1259 | /* |
1260 | * Remove a subdir from a directory. | |
1261 | */ | |
1262 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1263 | { | |
1264 | if (d_really_is_positive(dentry)) { | |
1265 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1266 | ||
1267 | clear_nlink(&vnode->vfs_inode); | |
1268 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1269 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1270 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1271 | } |
1272 | } | |
1273 | ||
260a9803 DH |
1274 | /* |
1275 | * remove a directory from an AFS filesystem | |
1276 | */ | |
1277 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1278 | { | |
a58823ac | 1279 | struct afs_status_cb *scb; |
d2ddc776 | 1280 | struct afs_fs_cursor fc; |
f58db83f | 1281 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 DH |
1282 | struct key *key; |
1283 | int ret; | |
1284 | ||
3b6492df | 1285 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1286 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1287 | |
a58823ac DH |
1288 | scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); |
1289 | if (!scb) | |
1290 | return -ENOMEM; | |
1291 | ||
260a9803 DH |
1292 | key = afs_request_key(dvnode->volume->cell); |
1293 | if (IS_ERR(key)) { | |
1294 | ret = PTR_ERR(key); | |
1295 | goto error; | |
1296 | } | |
1297 | ||
f58db83f DH |
1298 | /* Try to make sure we have a callback promise on the victim. */ |
1299 | if (d_really_is_positive(dentry)) { | |
1300 | vnode = AFS_FS_I(d_inode(dentry)); | |
1301 | ret = afs_validate(vnode, key); | |
1302 | if (ret < 0) | |
1303 | goto error_key; | |
1304 | } | |
1305 | ||
79ddbfa5 DH |
1306 | if (vnode) { |
1307 | ret = down_write_killable(&vnode->rmdir_lock); | |
1308 | if (ret < 0) | |
1309 | goto error_key; | |
1310 | } | |
1311 | ||
d2ddc776 | 1312 | ret = -ERESTARTSYS; |
20b8391f | 1313 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac DH |
1314 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
1315 | ||
d2ddc776 | 1316 | while (afs_select_fileserver(&fc)) { |
68251f0a | 1317 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
a58823ac | 1318 | afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb); |
d2ddc776 | 1319 | } |
260a9803 | 1320 | |
a58823ac DH |
1321 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, |
1322 | &data_version, scb); | |
d2ddc776 | 1323 | ret = afs_end_vnode_operation(&fc); |
63a4681f | 1324 | if (ret == 0) { |
d2ddc776 | 1325 | afs_dir_remove_subdir(dentry); |
63a4681f DH |
1326 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1327 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1328 | afs_edit_dir_for_rmdir); | |
1329 | } | |
260a9803 DH |
1330 | } |
1331 | ||
79ddbfa5 DH |
1332 | if (vnode) |
1333 | up_write(&vnode->rmdir_lock); | |
f58db83f | 1334 | error_key: |
260a9803 | 1335 | key_put(key); |
260a9803 | 1336 | error: |
a58823ac | 1337 | kfree(scb); |
260a9803 DH |
1338 | return ret; |
1339 | } | |
1340 | ||
1341 | /* | |
d2ddc776 DH |
1342 | * Remove a link to a file or symlink from a directory. |
1343 | * | |
1344 | * If the file was not deleted due to excess hard links, the fileserver will | |
1345 | * break the callback promise on the file - if it had one - before it returns | |
1346 | * to us, and if it was deleted, it won't | |
1347 | * | |
1348 | * However, if we didn't have a callback promise outstanding, or it was | |
1349 | * outstanding on a different server, then it won't break it either... | |
1350 | */ | |
a38a7558 DH |
1351 | static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry, |
1352 | struct key *key) | |
d2ddc776 DH |
1353 | { |
1354 | int ret = 0; | |
1355 | ||
1356 | if (d_really_is_positive(dentry)) { | |
1357 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1358 | ||
30062bd1 DH |
1359 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1360 | /* Already done */ | |
a38a7558 DH |
1361 | } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { |
1362 | write_seqlock(&vnode->cb_lock); | |
440fbc3a DH |
1363 | drop_nlink(&vnode->vfs_inode); |
1364 | if (vnode->vfs_inode.i_nlink == 0) { | |
1365 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
a38a7558 | 1366 | __afs_break_callback(vnode); |
440fbc3a | 1367 | } |
a38a7558 | 1368 | write_sequnlock(&vnode->cb_lock); |
d2ddc776 | 1369 | ret = 0; |
440fbc3a | 1370 | } else { |
a38a7558 | 1371 | afs_break_callback(vnode); |
440fbc3a DH |
1372 | |
1373 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1374 | kdebug("AFS_VNODE_DELETED"); | |
1375 | ||
1376 | ret = afs_validate(vnode, key); | |
1377 | if (ret == -ESTALE) | |
1378 | ret = 0; | |
1379 | } | |
d2ddc776 DH |
1380 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1381 | } | |
1382 | ||
1383 | return ret; | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1388 | */ |
1389 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1390 | { | |
d2ddc776 | 1391 | struct afs_fs_cursor fc; |
a58823ac | 1392 | struct afs_status_cb *scb; |
30062bd1 | 1393 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 | 1394 | struct key *key; |
79ddbfa5 | 1395 | bool need_rehash = false; |
260a9803 DH |
1396 | int ret; |
1397 | ||
3b6492df | 1398 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1399 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1400 | |
45222b9e | 1401 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1402 | return -ENAMETOOLONG; |
260a9803 | 1403 | |
a58823ac DH |
1404 | ret = -ENOMEM; |
1405 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1406 | if (!scb) | |
1407 | goto error; | |
1408 | ||
260a9803 DH |
1409 | key = afs_request_key(dvnode->volume->cell); |
1410 | if (IS_ERR(key)) { | |
1411 | ret = PTR_ERR(key); | |
a58823ac | 1412 | goto error_scb; |
260a9803 DH |
1413 | } |
1414 | ||
d2ddc776 | 1415 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1416 | if (d_really_is_positive(dentry)) { |
1417 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1418 | ret = afs_validate(vnode, key); |
1419 | if (ret < 0) | |
d2ddc776 | 1420 | goto error_key; |
260a9803 DH |
1421 | } |
1422 | ||
79ddbfa5 DH |
1423 | spin_lock(&dentry->d_lock); |
1424 | if (vnode && d_count(dentry) > 1) { | |
1425 | spin_unlock(&dentry->d_lock); | |
1426 | /* Start asynchronous writeout of the inode */ | |
1427 | write_inode_now(d_inode(dentry), 0); | |
1428 | ret = afs_sillyrename(dvnode, vnode, dentry, key); | |
1429 | goto error_key; | |
1430 | } | |
1431 | if (!d_unhashed(dentry)) { | |
1432 | /* Prevent a race with RCU lookup. */ | |
1433 | __d_drop(dentry); | |
1434 | need_rehash = true; | |
1435 | } | |
1436 | spin_unlock(&dentry->d_lock); | |
1437 | ||
d2ddc776 | 1438 | ret = -ERESTARTSYS; |
20b8391f | 1439 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac | 1440 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
a38a7558 | 1441 | afs_dataversion_t data_version_2 = vnode->status.data_version; |
a58823ac | 1442 | |
d2ddc776 | 1443 | while (afs_select_fileserver(&fc)) { |
68251f0a | 1444 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
a38a7558 | 1445 | fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); |
30062bd1 DH |
1446 | |
1447 | if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && | |
1448 | !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { | |
1449 | yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, | |
a58823ac | 1450 | &scb[0], &scb[1]); |
30062bd1 DH |
1451 | if (fc.ac.error != -ECONNABORTED || |
1452 | fc.ac.abort_code != RXGEN_OPCODE) | |
1453 | continue; | |
1454 | set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); | |
1455 | } | |
1456 | ||
a58823ac | 1457 | afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]); |
d2ddc776 | 1458 | } |
260a9803 | 1459 | |
a58823ac DH |
1460 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, |
1461 | &data_version, &scb[0]); | |
a38a7558 DH |
1462 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, |
1463 | &data_version_2, &scb[1]); | |
d2ddc776 | 1464 | ret = afs_end_vnode_operation(&fc); |
a38a7558 DH |
1465 | if (ret == 0 && !(scb[1].have_status || scb[1].have_error)) |
1466 | ret = afs_dir_remove_link(dvnode, dentry, key); | |
63a4681f DH |
1467 | if (ret == 0 && |
1468 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1469 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1470 | afs_edit_dir_for_unlink); | |
260a9803 DH |
1471 | } |
1472 | ||
79ddbfa5 DH |
1473 | if (need_rehash && ret < 0 && ret != -ENOENT) |
1474 | d_rehash(dentry); | |
1475 | ||
d2ddc776 | 1476 | error_key: |
260a9803 | 1477 | key_put(key); |
a58823ac DH |
1478 | error_scb: |
1479 | kfree(scb); | |
260a9803 DH |
1480 | error: |
1481 | _leave(" = %d", ret); | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * create a regular file on an AFS filesystem | |
1487 | */ | |
4acdaf27 | 1488 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1489 | bool excl) |
260a9803 | 1490 | { |
b8359153 | 1491 | struct afs_iget_data iget_data; |
d2ddc776 | 1492 | struct afs_fs_cursor fc; |
a58823ac | 1493 | struct afs_status_cb *scb; |
43dd388b | 1494 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1495 | struct key *key; |
1496 | int ret; | |
1497 | ||
d2ddc776 | 1498 | mode |= S_IFREG; |
260a9803 | 1499 | |
3b6492df | 1500 | _enter("{%llx:%llu},{%pd},%ho,", |
a455589f | 1501 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1502 | |
d2ddc776 DH |
1503 | ret = -ENAMETOOLONG; |
1504 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1505 | goto error; | |
1506 | ||
260a9803 DH |
1507 | key = afs_request_key(dvnode->volume->cell); |
1508 | if (IS_ERR(key)) { | |
1509 | ret = PTR_ERR(key); | |
1510 | goto error; | |
1511 | } | |
1512 | ||
a58823ac DH |
1513 | ret = -ENOMEM; |
1514 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1515 | if (!scb) | |
1516 | goto error_scb; | |
1517 | ||
d2ddc776 | 1518 | ret = -ERESTARTSYS; |
20b8391f | 1519 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac DH |
1520 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
1521 | ||
d2ddc776 | 1522 | while (afs_select_fileserver(&fc)) { |
68251f0a | 1523 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
b8359153 | 1524 | afs_prep_for_new_inode(&fc, &iget_data); |
a58823ac | 1525 | afs_fs_create(&fc, dentry->d_name.name, mode, |
b8359153 | 1526 | &scb[0], &iget_data.fid, &scb[1]); |
d2ddc776 | 1527 | } |
260a9803 | 1528 | |
a58823ac DH |
1529 | afs_check_for_remote_deletion(&fc, dvnode); |
1530 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, | |
1531 | &data_version, &scb[0]); | |
b8359153 | 1532 | afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); |
d2ddc776 DH |
1533 | ret = afs_end_vnode_operation(&fc); |
1534 | if (ret < 0) | |
1535 | goto error_key; | |
4433b691 DH |
1536 | } else { |
1537 | goto error_key; | |
260a9803 DH |
1538 | } |
1539 | ||
63a4681f | 1540 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
b8359153 | 1541 | afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, |
63a4681f DH |
1542 | afs_edit_dir_for_create); |
1543 | ||
a58823ac | 1544 | kfree(scb); |
260a9803 DH |
1545 | key_put(key); |
1546 | _leave(" = 0"); | |
1547 | return 0; | |
1548 | ||
a58823ac DH |
1549 | error_scb: |
1550 | kfree(scb); | |
d2ddc776 | 1551 | error_key: |
260a9803 DH |
1552 | key_put(key); |
1553 | error: | |
1554 | d_drop(dentry); | |
1555 | _leave(" = %d", ret); | |
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * create a hard link between files in an AFS filesystem | |
1561 | */ | |
1562 | static int afs_link(struct dentry *from, struct inode *dir, | |
1563 | struct dentry *dentry) | |
1564 | { | |
d2ddc776 | 1565 | struct afs_fs_cursor fc; |
a58823ac DH |
1566 | struct afs_status_cb *scb; |
1567 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1568 | struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); | |
260a9803 DH |
1569 | struct key *key; |
1570 | int ret; | |
1571 | ||
3b6492df | 1572 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1573 | vnode->fid.vid, vnode->fid.vnode, |
1574 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1575 | dentry); |
260a9803 | 1576 | |
d2ddc776 DH |
1577 | ret = -ENAMETOOLONG; |
1578 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1579 | goto error; | |
1580 | ||
a58823ac DH |
1581 | ret = -ENOMEM; |
1582 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1583 | if (!scb) | |
1584 | goto error; | |
1585 | ||
260a9803 DH |
1586 | key = afs_request_key(dvnode->volume->cell); |
1587 | if (IS_ERR(key)) { | |
1588 | ret = PTR_ERR(key); | |
a58823ac | 1589 | goto error_scb; |
260a9803 DH |
1590 | } |
1591 | ||
d2ddc776 | 1592 | ret = -ERESTARTSYS; |
20b8391f | 1593 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac DH |
1594 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
1595 | ||
d2ddc776 DH |
1596 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { |
1597 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1598 | goto error_key; |
d2ddc776 DH |
1599 | } |
1600 | ||
1601 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1602 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
1603 | fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); | |
a58823ac DH |
1604 | afs_fs_link(&fc, vnode, dentry->d_name.name, |
1605 | &scb[0], &scb[1]); | |
d2ddc776 DH |
1606 | } |
1607 | ||
a58823ac DH |
1608 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, |
1609 | &data_version, &scb[0]); | |
1610 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, | |
1611 | NULL, &scb[1]); | |
d2ddc776 DH |
1612 | ihold(&vnode->vfs_inode); |
1613 | d_instantiate(dentry, &vnode->vfs_inode); | |
1614 | ||
1615 | mutex_unlock(&vnode->io_lock); | |
1616 | ret = afs_end_vnode_operation(&fc); | |
1617 | if (ret < 0) | |
1618 | goto error_key; | |
4433b691 DH |
1619 | } else { |
1620 | goto error_key; | |
d2ddc776 | 1621 | } |
260a9803 | 1622 | |
63a4681f DH |
1623 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1624 | afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, | |
1625 | afs_edit_dir_for_link); | |
1626 | ||
260a9803 | 1627 | key_put(key); |
a58823ac | 1628 | kfree(scb); |
260a9803 DH |
1629 | _leave(" = 0"); |
1630 | return 0; | |
1631 | ||
d2ddc776 | 1632 | error_key: |
260a9803 | 1633 | key_put(key); |
a58823ac DH |
1634 | error_scb: |
1635 | kfree(scb); | |
260a9803 DH |
1636 | error: |
1637 | d_drop(dentry); | |
1638 | _leave(" = %d", ret); | |
1639 | return ret; | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * create a symlink in an AFS filesystem | |
1644 | */ | |
1645 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1646 | const char *content) | |
1647 | { | |
b8359153 | 1648 | struct afs_iget_data iget_data; |
d2ddc776 | 1649 | struct afs_fs_cursor fc; |
a58823ac | 1650 | struct afs_status_cb *scb; |
d2ddc776 | 1651 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1652 | struct key *key; |
1653 | int ret; | |
1654 | ||
3b6492df | 1655 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1656 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1657 | content); |
1658 | ||
d2ddc776 DH |
1659 | ret = -ENAMETOOLONG; |
1660 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1661 | goto error; | |
1662 | ||
260a9803 | 1663 | ret = -EINVAL; |
45222b9e | 1664 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1665 | goto error; |
1666 | ||
a58823ac DH |
1667 | ret = -ENOMEM; |
1668 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1669 | if (!scb) | |
1670 | goto error; | |
1671 | ||
260a9803 DH |
1672 | key = afs_request_key(dvnode->volume->cell); |
1673 | if (IS_ERR(key)) { | |
1674 | ret = PTR_ERR(key); | |
a58823ac | 1675 | goto error_scb; |
260a9803 DH |
1676 | } |
1677 | ||
d2ddc776 | 1678 | ret = -ERESTARTSYS; |
20b8391f | 1679 | if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { |
a58823ac DH |
1680 | afs_dataversion_t data_version = dvnode->status.data_version + 1; |
1681 | ||
d2ddc776 | 1682 | while (afs_select_fileserver(&fc)) { |
68251f0a | 1683 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
b8359153 | 1684 | afs_prep_for_new_inode(&fc, &iget_data); |
a58823ac | 1685 | afs_fs_symlink(&fc, dentry->d_name.name, content, |
b8359153 | 1686 | &scb[0], &iget_data.fid, &scb[1]); |
d2ddc776 | 1687 | } |
260a9803 | 1688 | |
a58823ac DH |
1689 | afs_check_for_remote_deletion(&fc, dvnode); |
1690 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break, | |
1691 | &data_version, &scb[0]); | |
b8359153 | 1692 | afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); |
d2ddc776 DH |
1693 | ret = afs_end_vnode_operation(&fc); |
1694 | if (ret < 0) | |
1695 | goto error_key; | |
4433b691 DH |
1696 | } else { |
1697 | goto error_key; | |
260a9803 DH |
1698 | } |
1699 | ||
63a4681f | 1700 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
b8359153 | 1701 | afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, |
63a4681f DH |
1702 | afs_edit_dir_for_symlink); |
1703 | ||
260a9803 | 1704 | key_put(key); |
a58823ac | 1705 | kfree(scb); |
260a9803 DH |
1706 | _leave(" = 0"); |
1707 | return 0; | |
1708 | ||
d2ddc776 | 1709 | error_key: |
260a9803 | 1710 | key_put(key); |
a58823ac DH |
1711 | error_scb: |
1712 | kfree(scb); | |
260a9803 DH |
1713 | error: |
1714 | d_drop(dentry); | |
1715 | _leave(" = %d", ret); | |
1716 | return ret; | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * rename a file in an AFS filesystem and/or move it between directories | |
1721 | */ | |
1722 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1723 | struct inode *new_dir, struct dentry *new_dentry, |
1724 | unsigned int flags) | |
260a9803 | 1725 | { |
d2ddc776 | 1726 | struct afs_fs_cursor fc; |
a58823ac | 1727 | struct afs_status_cb *scb; |
260a9803 | 1728 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
79ddbfa5 DH |
1729 | struct dentry *tmp = NULL, *rehash = NULL; |
1730 | struct inode *new_inode; | |
260a9803 | 1731 | struct key *key; |
63a4681f | 1732 | bool new_negative = d_is_negative(new_dentry); |
260a9803 DH |
1733 | int ret; |
1734 | ||
1cd66c93 MS |
1735 | if (flags) |
1736 | return -EINVAL; | |
1737 | ||
79ddbfa5 DH |
1738 | /* Don't allow silly-rename files be moved around. */ |
1739 | if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1740 | return -EINVAL; | |
1741 | ||
2b0143b5 | 1742 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1743 | orig_dvnode = AFS_FS_I(old_dir); |
1744 | new_dvnode = AFS_FS_I(new_dir); | |
1745 | ||
3b6492df | 1746 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1747 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1748 | vnode->fid.vid, vnode->fid.vnode, | |
1749 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1750 | new_dentry); |
260a9803 | 1751 | |
a58823ac DH |
1752 | ret = -ENOMEM; |
1753 | scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); | |
1754 | if (!scb) | |
1755 | goto error; | |
1756 | ||
260a9803 DH |
1757 | key = afs_request_key(orig_dvnode->volume->cell); |
1758 | if (IS_ERR(key)) { | |
1759 | ret = PTR_ERR(key); | |
a58823ac | 1760 | goto error_scb; |
260a9803 DH |
1761 | } |
1762 | ||
79ddbfa5 DH |
1763 | /* For non-directories, check whether the target is busy and if so, |
1764 | * make a copy of the dentry and then do a silly-rename. If the | |
1765 | * silly-rename succeeds, the copied dentry is hashed and becomes the | |
1766 | * new target. | |
1767 | */ | |
1768 | if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { | |
1769 | /* To prevent any new references to the target during the | |
1770 | * rename, we unhash the dentry in advance. | |
1771 | */ | |
1772 | if (!d_unhashed(new_dentry)) { | |
1773 | d_drop(new_dentry); | |
1774 | rehash = new_dentry; | |
1775 | } | |
1776 | ||
1777 | if (d_count(new_dentry) > 2) { | |
1778 | /* copy the target dentry's name */ | |
1779 | ret = -ENOMEM; | |
1780 | tmp = d_alloc(new_dentry->d_parent, | |
1781 | &new_dentry->d_name); | |
1782 | if (!tmp) | |
1783 | goto error_rehash; | |
1784 | ||
1785 | ret = afs_sillyrename(new_dvnode, | |
1786 | AFS_FS_I(d_inode(new_dentry)), | |
1787 | new_dentry, key); | |
1788 | if (ret) | |
1789 | goto error_rehash; | |
1790 | ||
1791 | new_dentry = tmp; | |
1792 | rehash = NULL; | |
1793 | new_negative = true; | |
79ddbfa5 DH |
1794 | } |
1795 | } | |
1796 | ||
d2ddc776 | 1797 | ret = -ERESTARTSYS; |
20b8391f | 1798 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { |
a58823ac DH |
1799 | afs_dataversion_t orig_data_version; |
1800 | afs_dataversion_t new_data_version; | |
1801 | struct afs_status_cb *new_scb = &scb[1]; | |
1802 | ||
1803 | orig_data_version = orig_dvnode->status.data_version + 1; | |
1804 | ||
d2ddc776 DH |
1805 | if (orig_dvnode != new_dvnode) { |
1806 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1807 | afs_end_vnode_operation(&fc); | |
79ddbfa5 | 1808 | goto error_rehash; |
d2ddc776 | 1809 | } |
a58823ac DH |
1810 | new_data_version = new_dvnode->status.data_version; |
1811 | } else { | |
1812 | new_data_version = orig_data_version; | |
1813 | new_scb = &scb[0]; | |
d2ddc776 | 1814 | } |
a58823ac | 1815 | |
d2ddc776 | 1816 | while (afs_select_fileserver(&fc)) { |
68251f0a DH |
1817 | fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); |
1818 | fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); | |
d2ddc776 | 1819 | afs_fs_rename(&fc, old_dentry->d_name.name, |
63a4681f | 1820 | new_dvnode, new_dentry->d_name.name, |
a58823ac | 1821 | &scb[0], new_scb); |
d2ddc776 DH |
1822 | } |
1823 | ||
a58823ac DH |
1824 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, |
1825 | &orig_data_version, &scb[0]); | |
1826 | if (new_dvnode != orig_dvnode) { | |
1827 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2, | |
1828 | &new_data_version, &scb[1]); | |
d2ddc776 | 1829 | mutex_unlock(&new_dvnode->io_lock); |
a58823ac | 1830 | } |
d2ddc776 DH |
1831 | ret = afs_end_vnode_operation(&fc); |
1832 | if (ret < 0) | |
79ddbfa5 | 1833 | goto error_rehash; |
d2ddc776 DH |
1834 | } |
1835 | ||
63a4681f | 1836 | if (ret == 0) { |
79ddbfa5 DH |
1837 | if (rehash) |
1838 | d_rehash(rehash); | |
63a4681f DH |
1839 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) |
1840 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
79ddbfa5 | 1841 | afs_edit_dir_for_rename_0); |
63a4681f DH |
1842 | |
1843 | if (!new_negative && | |
1844 | test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1845 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
79ddbfa5 | 1846 | afs_edit_dir_for_rename_1); |
63a4681f DH |
1847 | |
1848 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1849 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
79ddbfa5 DH |
1850 | &vnode->fid, afs_edit_dir_for_rename_2); |
1851 | ||
1852 | new_inode = d_inode(new_dentry); | |
1853 | if (new_inode) { | |
1854 | spin_lock(&new_inode->i_lock); | |
1855 | if (new_inode->i_nlink > 0) | |
1856 | drop_nlink(new_inode); | |
1857 | spin_unlock(&new_inode->i_lock); | |
1858 | } | |
1859 | d_move(old_dentry, new_dentry); | |
1860 | goto error_tmp; | |
63a4681f DH |
1861 | } |
1862 | ||
79ddbfa5 DH |
1863 | error_rehash: |
1864 | if (rehash) | |
1865 | d_rehash(rehash); | |
1866 | error_tmp: | |
1867 | if (tmp) | |
1868 | dput(tmp); | |
260a9803 | 1869 | key_put(key); |
a58823ac DH |
1870 | error_scb: |
1871 | kfree(scb); | |
260a9803 | 1872 | error: |
260a9803 DH |
1873 | _leave(" = %d", ret); |
1874 | return ret; | |
1875 | } | |
f3ddee8d DH |
1876 | |
1877 | /* | |
1878 | * Release a directory page and clean up its private state if it's not busy | |
1879 | * - return true if the page can now be released, false if not | |
1880 | */ | |
1881 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1882 | { | |
1883 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1884 | ||
3b6492df | 1885 | _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); |
f3ddee8d DH |
1886 | |
1887 | set_page_private(page, 0); | |
1888 | ClearPagePrivate(page); | |
1889 | ||
1890 | /* The directory will need reloading. */ | |
1891 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1892 | afs_stat_v(dvnode, n_relpg); | |
1893 | return 1; | |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * invalidate part or all of a page | |
1898 | * - release a page and clean up its private data if offset is 0 (indicating | |
1899 | * the entire page) | |
1900 | */ | |
1901 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1902 | unsigned int length) | |
1903 | { | |
1904 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1905 | ||
1906 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1907 | ||
1908 | BUG_ON(!PageLocked(page)); | |
1909 | ||
1910 | /* The directory will need reloading. */ | |
1911 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1912 | afs_stat_v(dvnode, n_inval); | |
1913 | ||
1914 | /* we clean up only if the entire page is being invalidated */ | |
1915 | if (offset == 0 && length == PAGE_SIZE) { | |
1916 | set_page_private(page, 0); | |
1917 | ClearPagePrivate(page); | |
1918 | } | |
1919 | } |