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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; | |
5cf9dd55 | 102 | struct afs_fid fids[50]; |
1da177e4 LT |
103 | }; |
104 | ||
1da177e4 LT |
105 | /* |
106 | * check that a directory page is valid | |
107 | */ | |
f3ddee8d DH |
108 | static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
109 | loff_t i_size) | |
1da177e4 | 110 | { |
00317636 | 111 | struct afs_xdr_dir_page *dbuf; |
f3ddee8d | 112 | loff_t latter, off; |
1da177e4 LT |
113 | int tmp, qty; |
114 | ||
dab17c1a DH |
115 | /* Determine how many magic numbers there should be in this page, but |
116 | * we must take care because the directory may change size under us. | |
117 | */ | |
118 | off = page_offset(page); | |
dab17c1a DH |
119 | if (i_size <= off) |
120 | goto checked; | |
121 | ||
122 | latter = i_size - off; | |
1da177e4 LT |
123 | if (latter >= PAGE_SIZE) |
124 | qty = PAGE_SIZE; | |
125 | else | |
126 | qty = latter; | |
00317636 | 127 | qty /= sizeof(union afs_xdr_dir_block); |
1da177e4 LT |
128 | |
129 | /* check them */ | |
63a4681f | 130 | dbuf = kmap(page); |
1da177e4 | 131 | for (tmp = 0; tmp < qty; tmp++) { |
00317636 | 132 | if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { |
dab17c1a | 133 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
f3ddee8d | 134 | __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
00317636 | 135 | ntohs(dbuf->blocks[tmp].hdr.magic)); |
f3ddee8d | 136 | trace_afs_dir_check_failed(dvnode, off, i_size); |
63a4681f | 137 | kunmap(page); |
f51375cd | 138 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
139 | goto error; |
140 | } | |
63a4681f DH |
141 | |
142 | /* Make sure each block is NUL terminated so we can reasonably | |
143 | * use string functions on it. The filenames in the page | |
144 | * *should* be NUL-terminated anyway. | |
145 | */ | |
146 | ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; | |
1da177e4 LT |
147 | } |
148 | ||
63a4681f DH |
149 | kunmap(page); |
150 | ||
dab17c1a | 151 | checked: |
f3ddee8d | 152 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 153 | return true; |
1da177e4 | 154 | |
ec26815a | 155 | error: |
be5b82db | 156 | return false; |
ec26815a | 157 | } |
1da177e4 | 158 | |
445b1028 DH |
159 | /* |
160 | * Check the contents of a directory that we've just read. | |
161 | */ | |
162 | static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) | |
163 | { | |
164 | struct afs_xdr_dir_page *dbuf; | |
165 | unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); | |
166 | ||
167 | for (i = 0; i < req->nr_pages; i++) | |
168 | if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) | |
169 | goto bad; | |
170 | return true; | |
171 | ||
172 | bad: | |
173 | pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", | |
174 | dvnode->fid.vid, dvnode->fid.vnode, | |
175 | req->file_size, req->len, req->actual_len, req->remain); | |
176 | pr_warn("DIR %llx %x %x %x\n", | |
177 | req->pos, req->index, req->nr_pages, req->offset); | |
178 | ||
179 | for (i = 0; i < req->nr_pages; i++) { | |
180 | dbuf = kmap(req->pages[i]); | |
181 | for (j = 0; j < qty; j++) { | |
182 | union afs_xdr_dir_block *block = &dbuf->blocks[j]; | |
183 | ||
184 | pr_warn("[%02x] %32phN\n", i * qty + j, block); | |
185 | } | |
186 | kunmap(req->pages[i]); | |
187 | } | |
188 | return false; | |
189 | } | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * open an AFS directory file | |
193 | */ | |
194 | static int afs_dir_open(struct inode *inode, struct file *file) | |
195 | { | |
196 | _enter("{%lu}", inode->i_ino); | |
197 | ||
00317636 DH |
198 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
199 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 200 | |
08e0e7c8 | 201 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
202 | return -ENOENT; |
203 | ||
00d3b7a4 | 204 | return afs_open(inode, file); |
ec26815a | 205 | } |
1da177e4 | 206 | |
f3ddee8d DH |
207 | /* |
208 | * Read the directory into the pagecache in one go, scrubbing the previous | |
209 | * contents. The list of pages is returned, pinning them so that they don't | |
210 | * get reclaimed during the iteration. | |
211 | */ | |
212 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 213 | __acquires(&dvnode->validate_lock) |
f3ddee8d DH |
214 | { |
215 | struct afs_read *req; | |
216 | loff_t i_size; | |
217 | int nr_pages, nr_inline, i, n; | |
218 | int ret = -ENOMEM; | |
219 | ||
220 | retry: | |
221 | i_size = i_size_read(&dvnode->vfs_inode); | |
222 | if (i_size < 2048) | |
f51375cd DH |
223 | return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); |
224 | if (i_size > 2048 * 1024) { | |
225 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
f3ddee8d | 226 | return ERR_PTR(-EFBIG); |
f51375cd | 227 | } |
f3ddee8d DH |
228 | |
229 | _enter("%llu", i_size); | |
230 | ||
231 | /* Get a request record to hold the page list. We want to hold it | |
232 | * inline if we can, but we don't want to make an order 1 allocation. | |
233 | */ | |
234 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
235 | nr_inline = nr_pages; | |
236 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
237 | nr_inline = 0; | |
238 | ||
ee102584 | 239 | req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL); |
f3ddee8d DH |
240 | if (!req) |
241 | return ERR_PTR(-ENOMEM); | |
242 | ||
243 | refcount_set(&req->usage, 1); | |
244 | req->nr_pages = nr_pages; | |
245 | req->actual_len = i_size; /* May change */ | |
246 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
247 | req->data_version = dvnode->status.data_version; /* May change */ | |
248 | if (nr_inline > 0) { | |
249 | req->pages = req->array; | |
250 | } else { | |
251 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
252 | GFP_KERNEL); | |
253 | if (!req->pages) | |
254 | goto error; | |
255 | } | |
256 | ||
257 | /* Get a list of all the pages that hold or will hold the directory | |
258 | * content. We need to fill in any gaps that we might find where the | |
259 | * memory reclaimer has been at work. If there are any gaps, we will | |
260 | * need to reread the entire directory contents. | |
261 | */ | |
262 | i = 0; | |
263 | do { | |
264 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
265 | req->nr_pages - i, | |
266 | req->pages + i); | |
267 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
268 | if (n == 0) { | |
269 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
270 | ||
271 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
272 | afs_stat_v(dvnode, n_inval); | |
273 | ||
274 | ret = -ENOMEM; | |
275 | req->pages[i] = __page_cache_alloc(gfp); | |
276 | if (!req->pages[i]) | |
277 | goto error; | |
278 | ret = add_to_page_cache_lru(req->pages[i], | |
279 | dvnode->vfs_inode.i_mapping, | |
280 | i, gfp); | |
281 | if (ret < 0) | |
282 | goto error; | |
283 | ||
284 | set_page_private(req->pages[i], 1); | |
285 | SetPagePrivate(req->pages[i]); | |
286 | unlock_page(req->pages[i]); | |
287 | i++; | |
288 | } else { | |
289 | i += n; | |
290 | } | |
291 | } while (i < req->nr_pages); | |
292 | ||
293 | /* If we're going to reload, we need to lock all the pages to prevent | |
294 | * races. | |
295 | */ | |
b61f7dcf DH |
296 | ret = -ERESTARTSYS; |
297 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
298 | goto error; | |
f3ddee8d | 299 | |
b61f7dcf DH |
300 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
301 | goto success; | |
f3ddee8d | 302 | |
b61f7dcf DH |
303 | up_read(&dvnode->validate_lock); |
304 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
305 | goto error; | |
306 | ||
307 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
99987c56 | 308 | trace_afs_reload_dir(dvnode); |
f3ddee8d DH |
309 | ret = afs_fetch_data(dvnode, key, req); |
310 | if (ret < 0) | |
b61f7dcf | 311 | goto error_unlock; |
f3ddee8d DH |
312 | |
313 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
314 | ||
315 | if (req->len < req->file_size) | |
316 | goto content_has_grown; | |
317 | ||
318 | /* Validate the data we just read. */ | |
319 | ret = -EIO; | |
445b1028 DH |
320 | if (!afs_dir_check_pages(dvnode, req)) |
321 | goto error_unlock; | |
f3ddee8d DH |
322 | |
323 | // TODO: Trim excess pages | |
324 | ||
325 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
326 | } | |
327 | ||
b61f7dcf | 328 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 329 | success: |
f3ddee8d DH |
330 | return req; |
331 | ||
f3ddee8d | 332 | error_unlock: |
b61f7dcf | 333 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
334 | error: |
335 | afs_put_read(req); | |
336 | _leave(" = %d", ret); | |
337 | return ERR_PTR(ret); | |
338 | ||
339 | content_has_grown: | |
b61f7dcf | 340 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
341 | afs_put_read(req); |
342 | goto retry; | |
343 | } | |
344 | ||
1da177e4 LT |
345 | /* |
346 | * deal with one block in an AFS directory | |
347 | */ | |
f51375cd DH |
348 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
349 | struct dir_context *ctx, | |
00317636 | 350 | union afs_xdr_dir_block *block, |
1bbae9f8 | 351 | unsigned blkoff) |
1da177e4 | 352 | { |
00317636 | 353 | union afs_xdr_dirent *dire; |
1da177e4 LT |
354 | unsigned offset, next, curr; |
355 | size_t nlen; | |
1bbae9f8 | 356 | int tmp; |
1da177e4 | 357 | |
1bbae9f8 | 358 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 359 | |
00317636 | 360 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
361 | |
362 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
363 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
364 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
365 | offset = next |
366 | ) { | |
367 | next = offset + 1; | |
368 | ||
369 | /* skip entries marked unused in the bitmap */ | |
00317636 | 370 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 371 | (1 << (offset % 8)))) { |
5b5e0928 | 372 | _debug("ENT[%zu.%u]: unused", |
00317636 | 373 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 374 | if (offset >= curr) |
1bbae9f8 | 375 | ctx->pos = blkoff + |
00317636 | 376 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
377 | continue; |
378 | } | |
379 | ||
380 | /* got a valid entry */ | |
381 | dire = &block->dirents[offset]; | |
382 | nlen = strnlen(dire->u.name, | |
383 | sizeof(*block) - | |
00317636 | 384 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 385 | |
5b5e0928 | 386 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 387 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
388 | (offset < curr ? "skip" : "fill"), |
389 | nlen, dire->u.name); | |
390 | ||
391 | /* work out where the next possible entry is */ | |
00317636 | 392 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 393 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 394 | _debug("ENT[%zu.%u]:" |
1da177e4 | 395 | " %u travelled beyond end dir block" |
5b5e0928 | 396 | " (len %u/%zu)", |
00317636 | 397 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 398 | offset, next, tmp, nlen); |
f51375cd | 399 | return afs_bad(dvnode, afs_file_error_dir_over_end); |
1da177e4 | 400 | } |
00317636 | 401 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 402 | (1 << (next % 8)))) { |
5b5e0928 AD |
403 | _debug("ENT[%zu.%u]:" |
404 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 405 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 406 | offset, next, tmp, nlen); |
f51375cd | 407 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 LT |
408 | } |
409 | ||
5b5e0928 | 410 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 411 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
412 | next, tmp, nlen); |
413 | next++; | |
414 | } | |
415 | ||
416 | /* skip if starts before the current position */ | |
417 | if (offset < curr) | |
418 | continue; | |
419 | ||
420 | /* found the next entry */ | |
1bbae9f8 | 421 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 422 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
423 | (ctx->actor == afs_lookup_filldir || |
424 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 425 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
426 | _leave(" = 0 [full]"); |
427 | return 0; | |
428 | } | |
429 | ||
00317636 | 430 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
431 | } |
432 | ||
433 | _leave(" = 1 [more]"); | |
434 | return 1; | |
ec26815a | 435 | } |
1da177e4 | 436 | |
1da177e4 | 437 | /* |
08e0e7c8 | 438 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 439 | */ |
1bbae9f8 | 440 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
9dd0b82e | 441 | struct key *key, afs_dataversion_t *_dir_version) |
1da177e4 | 442 | { |
f3ddee8d | 443 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
444 | struct afs_xdr_dir_page *dbuf; |
445 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 446 | struct afs_read *req; |
1da177e4 LT |
447 | struct page *page; |
448 | unsigned blkoff, limit; | |
449 | int ret; | |
450 | ||
1bbae9f8 | 451 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 452 | |
08e0e7c8 | 453 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
454 | _leave(" = -ESTALE"); |
455 | return -ESTALE; | |
456 | } | |
457 | ||
f3ddee8d DH |
458 | req = afs_read_dir(dvnode, key); |
459 | if (IS_ERR(req)) | |
460 | return PTR_ERR(req); | |
9dd0b82e | 461 | *_dir_version = req->data_version; |
f3ddee8d | 462 | |
1da177e4 | 463 | /* round the file position up to the next entry boundary */ |
00317636 DH |
464 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
465 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
466 | |
467 | /* walk through the blocks in sequence */ | |
468 | ret = 0; | |
f3ddee8d | 469 | while (ctx->pos < req->actual_len) { |
00317636 | 470 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 471 | |
f3ddee8d DH |
472 | /* Fetch the appropriate page from the directory and re-add it |
473 | * to the LRU. | |
474 | */ | |
475 | page = req->pages[blkoff / PAGE_SIZE]; | |
476 | if (!page) { | |
f51375cd | 477 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
478 | break; |
479 | } | |
f3ddee8d | 480 | mark_page_accessed(page); |
1da177e4 LT |
481 | |
482 | limit = blkoff & ~(PAGE_SIZE - 1); | |
483 | ||
f3ddee8d | 484 | dbuf = kmap(page); |
1da177e4 LT |
485 | |
486 | /* deal with the individual blocks stashed on this page */ | |
487 | do { | |
488 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 489 | sizeof(union afs_xdr_dir_block)]; |
f51375cd | 490 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); |
1da177e4 | 491 | if (ret != 1) { |
f3ddee8d | 492 | kunmap(page); |
1da177e4 LT |
493 | goto out; |
494 | } | |
495 | ||
00317636 | 496 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 497 | |
1bbae9f8 | 498 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 499 | |
f3ddee8d | 500 | kunmap(page); |
1da177e4 LT |
501 | ret = 0; |
502 | } | |
503 | ||
ec26815a | 504 | out: |
b61f7dcf | 505 | up_read(&dvnode->validate_lock); |
f3ddee8d | 506 | afs_put_read(req); |
1da177e4 LT |
507 | _leave(" = %d", ret); |
508 | return ret; | |
ec26815a | 509 | } |
1da177e4 | 510 | |
1da177e4 LT |
511 | /* |
512 | * read an AFS directory | |
513 | */ | |
1bbae9f8 | 514 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 515 | { |
9dd0b82e DH |
516 | afs_dataversion_t dir_version; |
517 | ||
518 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), | |
519 | &dir_version); | |
ec26815a | 520 | } |
1da177e4 | 521 | |
1da177e4 | 522 | /* |
5cf9dd55 | 523 | * Search the directory for a single name |
1da177e4 LT |
524 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
525 | * uniquifier through dtype | |
526 | */ | |
5cf9dd55 DH |
527 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
528 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 529 | { |
5cf9dd55 DH |
530 | struct afs_lookup_one_cookie *cookie = |
531 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 532 | |
1bbae9f8 AV |
533 | _enter("{%s,%u},%s,%u,,%llu,%u", |
534 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 535 | (unsigned long long) ino, dtype); |
1da177e4 | 536 | |
08e0e7c8 | 537 | /* insanity checks first */ |
00317636 DH |
538 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
539 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 540 | |
1bbae9f8 AV |
541 | if (cookie->name.len != nlen || |
542 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
543 | _leave(" = 0 [no]"); |
544 | return 0; | |
545 | } | |
546 | ||
547 | cookie->fid.vnode = ino; | |
548 | cookie->fid.unique = dtype; | |
549 | cookie->found = 1; | |
550 | ||
551 | _leave(" = -1 [found]"); | |
552 | return -1; | |
ec26815a | 553 | } |
1da177e4 | 554 | |
1da177e4 | 555 | /* |
5cf9dd55 | 556 | * Do a lookup of a single name in a directory |
260a9803 | 557 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 558 | */ |
5cf9dd55 | 559 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
9dd0b82e DH |
560 | struct afs_fid *fid, struct key *key, |
561 | afs_dataversion_t *_dir_version) | |
1da177e4 | 562 | { |
1bbae9f8 | 563 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
564 | struct afs_lookup_one_cookie cookie = { |
565 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
566 | .name = dentry->d_name, |
567 | .fid.vid = as->volume->vid | |
568 | }; | |
1da177e4 LT |
569 | int ret; |
570 | ||
a455589f | 571 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 572 | |
1da177e4 | 573 | /* search the directory */ |
9dd0b82e | 574 | ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); |
1da177e4 | 575 | if (ret < 0) { |
08e0e7c8 DH |
576 | _leave(" = %d [iter]", ret); |
577 | return ret; | |
1da177e4 LT |
578 | } |
579 | ||
580 | ret = -ENOENT; | |
581 | if (!cookie.found) { | |
08e0e7c8 DH |
582 | _leave(" = -ENOENT [not found]"); |
583 | return -ENOENT; | |
1da177e4 LT |
584 | } |
585 | ||
08e0e7c8 | 586 | *fid = cookie.fid; |
3b6492df | 587 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
588 | return 0; |
589 | } | |
590 | ||
5cf9dd55 DH |
591 | /* |
592 | * search the directory for a name | |
593 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
594 | * uniquifier through dtype | |
595 | */ | |
596 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
597 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
598 | { | |
599 | struct afs_lookup_cookie *cookie = | |
600 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
601 | int ret; | |
602 | ||
603 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
604 | cookie->name.name, cookie->name.len, name, nlen, | |
605 | (unsigned long long) ino, dtype); | |
606 | ||
607 | /* insanity checks first */ | |
00317636 DH |
608 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
609 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
610 | |
611 | if (cookie->found) { | |
612 | if (cookie->nr_fids < 50) { | |
613 | cookie->fids[cookie->nr_fids].vnode = ino; | |
614 | cookie->fids[cookie->nr_fids].unique = dtype; | |
615 | cookie->nr_fids++; | |
616 | } | |
617 | } else if (cookie->name.len == nlen && | |
618 | memcmp(cookie->name.name, name, nlen) == 0) { | |
e49c7b2f DH |
619 | cookie->fids[1].vnode = ino; |
620 | cookie->fids[1].unique = dtype; | |
5cf9dd55 DH |
621 | cookie->found = 1; |
622 | if (cookie->one_only) | |
623 | return -1; | |
624 | } | |
625 | ||
626 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
627 | _leave(" = %d", ret); | |
628 | return ret; | |
629 | } | |
630 | ||
e49c7b2f DH |
631 | /* |
632 | * Deal with the result of a successful lookup operation. Turn all the files | |
633 | * into inodes and save the first one - which is the one we actually want. | |
634 | */ | |
635 | static void afs_do_lookup_success(struct afs_operation *op) | |
636 | { | |
637 | struct afs_vnode_param *vp; | |
638 | struct afs_vnode *vnode; | |
639 | struct inode *inode; | |
640 | u32 abort_code; | |
641 | int i; | |
642 | ||
643 | _enter(""); | |
644 | ||
645 | for (i = 0; i < op->nr_files; i++) { | |
646 | switch (i) { | |
647 | case 0: | |
648 | vp = &op->file[0]; | |
649 | abort_code = vp->scb.status.abort_code; | |
650 | if (abort_code != 0) { | |
651 | op->abort_code = abort_code; | |
652 | op->error = afs_abort_to_error(abort_code); | |
653 | } | |
654 | break; | |
655 | ||
656 | case 1: | |
657 | vp = &op->file[1]; | |
658 | break; | |
659 | ||
660 | default: | |
661 | vp = &op->more_files[i - 2]; | |
662 | break; | |
663 | } | |
664 | ||
665 | if (!vp->scb.have_status && !vp->scb.have_error) | |
666 | continue; | |
667 | ||
668 | _debug("do [%u]", i); | |
669 | if (vp->vnode) { | |
670 | if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) | |
671 | afs_vnode_commit_status(op, vp); | |
672 | } else if (vp->scb.status.abort_code == 0) { | |
673 | inode = afs_iget(op, vp); | |
674 | if (!IS_ERR(inode)) { | |
675 | vnode = AFS_FS_I(inode); | |
676 | afs_cache_permit(vnode, op->key, | |
677 | 0 /* Assume vnode->cb_break is 0 */ + | |
678 | op->cb_v_break, | |
679 | &vp->scb); | |
680 | vp->vnode = vnode; | |
681 | vp->put_vnode = true; | |
682 | } | |
683 | } else { | |
684 | _debug("- abort %d %llx:%llx.%x", | |
685 | vp->scb.status.abort_code, | |
686 | vp->fid.vid, vp->fid.vnode, vp->fid.unique); | |
687 | } | |
688 | } | |
689 | ||
690 | _leave(""); | |
691 | } | |
692 | ||
693 | static const struct afs_operation_ops afs_inline_bulk_status_operation = { | |
694 | .issue_afs_rpc = afs_fs_inline_bulk_status, | |
695 | .issue_yfs_rpc = yfs_fs_inline_bulk_status, | |
696 | .success = afs_do_lookup_success, | |
697 | }; | |
698 | ||
699 | static const struct afs_operation_ops afs_fetch_status_operation = { | |
700 | .issue_afs_rpc = afs_fs_fetch_status, | |
701 | .issue_yfs_rpc = yfs_fs_fetch_status, | |
702 | .success = afs_do_lookup_success, | |
703 | }; | |
704 | ||
20325960 DH |
705 | /* |
706 | * See if we know that the server we expect to use doesn't support | |
707 | * FS.InlineBulkStatus. | |
708 | */ | |
709 | static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) | |
710 | { | |
711 | struct afs_server_list *slist; | |
712 | struct afs_volume *volume = dvnode->volume; | |
713 | struct afs_server *server; | |
714 | bool ret = true; | |
715 | int i; | |
716 | ||
717 | if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) | |
718 | return true; | |
719 | ||
720 | rcu_read_lock(); | |
721 | slist = rcu_dereference(volume->servers); | |
722 | ||
723 | for (i = 0; i < slist->nr_servers; i++) { | |
724 | server = slist->servers[i].server; | |
725 | if (server == dvnode->cb_server) { | |
726 | if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) | |
727 | ret = false; | |
728 | break; | |
729 | } | |
730 | } | |
731 | ||
732 | rcu_read_unlock(); | |
733 | return ret; | |
734 | } | |
735 | ||
5cf9dd55 DH |
736 | /* |
737 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
738 | * files in one go and create inodes for them. The inode of the file we were | |
739 | * asked for is returned. | |
740 | */ | |
741 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
742 | struct key *key) | |
743 | { | |
744 | struct afs_lookup_cookie *cookie; | |
e49c7b2f DH |
745 | struct afs_vnode_param *vp; |
746 | struct afs_operation *op; | |
39db9815 DH |
747 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; |
748 | struct inode *inode = NULL, *ti; | |
9dd0b82e | 749 | afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); |
e49c7b2f DH |
750 | long ret; |
751 | int i; | |
5cf9dd55 DH |
752 | |
753 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
754 | ||
755 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
756 | if (!cookie) | |
757 | return ERR_PTR(-ENOMEM); | |
758 | ||
e49c7b2f DH |
759 | for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) |
760 | cookie->fids[i].vid = dvnode->fid.vid; | |
5cf9dd55 DH |
761 | cookie->ctx.actor = afs_lookup_filldir; |
762 | cookie->name = dentry->d_name; | |
13fcc635 DH |
763 | cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want |
764 | * and slot 1 for the directory */ | |
5cf9dd55 | 765 | |
20325960 DH |
766 | if (!afs_server_supports_ibulk(dvnode)) |
767 | cookie->one_only = true; | |
5cf9dd55 | 768 | |
5cf9dd55 | 769 | /* search the directory */ |
9dd0b82e | 770 | ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); |
e49c7b2f | 771 | if (ret < 0) |
5cf9dd55 | 772 | goto out; |
5cf9dd55 | 773 | |
9dd0b82e DH |
774 | dentry->d_fsdata = (void *)(unsigned long)data_version; |
775 | ||
e49c7b2f | 776 | ret = -ENOENT; |
5cf9dd55 DH |
777 | if (!cookie->found) |
778 | goto out; | |
779 | ||
780 | /* Check to see if we already have an inode for the primary fid. */ | |
e49c7b2f DH |
781 | inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, |
782 | afs_ilookup5_test_by_fid, &cookie->fids[1]); | |
5cf9dd55 | 783 | if (inode) |
e49c7b2f | 784 | goto out; /* We do */ |
5cf9dd55 | 785 | |
e49c7b2f DH |
786 | /* Okay, we didn't find it. We need to query the server - and whilst |
787 | * we're doing that, we're going to attempt to look up a bunch of other | |
788 | * vnodes also. | |
789 | */ | |
790 | op = afs_alloc_operation(NULL, dvnode->volume); | |
791 | if (IS_ERR(op)) { | |
792 | ret = PTR_ERR(op); | |
5cf9dd55 | 793 | goto out; |
e49c7b2f | 794 | } |
5cf9dd55 | 795 | |
e49c7b2f DH |
796 | afs_op_set_vnode(op, 0, dvnode); |
797 | afs_op_set_fid(op, 1, &cookie->fids[1]); | |
13fcc635 | 798 | |
e49c7b2f DH |
799 | op->nr_files = cookie->nr_fids; |
800 | _debug("nr_files %u", op->nr_files); | |
39db9815 | 801 | |
e49c7b2f DH |
802 | /* Need space for examining all the selected files */ |
803 | op->error = -ENOMEM; | |
804 | if (op->nr_files > 2) { | |
805 | op->more_files = kvcalloc(op->nr_files - 2, | |
806 | sizeof(struct afs_vnode_param), | |
807 | GFP_KERNEL); | |
808 | if (!op->more_files) | |
809 | goto out_op; | |
810 | ||
811 | for (i = 2; i < op->nr_files; i++) { | |
812 | vp = &op->more_files[i - 2]; | |
813 | vp->fid = cookie->fids[i]; | |
814 | ||
815 | /* Find any inodes that already exist and get their | |
816 | * callback counters. | |
817 | */ | |
818 | ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, | |
819 | afs_ilookup5_test_by_fid, &vp->fid); | |
820 | if (!IS_ERR_OR_NULL(ti)) { | |
821 | vnode = AFS_FS_I(ti); | |
822 | vp->dv_before = vnode->status.data_version; | |
823 | vp->cb_break_before = afs_calc_vnode_cb_break(vnode); | |
824 | vp->vnode = vnode; | |
825 | vp->put_vnode = true; | |
826 | } | |
39db9815 DH |
827 | } |
828 | } | |
829 | ||
5cf9dd55 DH |
830 | /* Try FS.InlineBulkStatus first. Abort codes for the individual |
831 | * lookups contained therein are stored in the reply without aborting | |
832 | * the whole operation. | |
833 | */ | |
e49c7b2f DH |
834 | op->error = -ENOTSUPP; |
835 | if (!cookie->one_only) { | |
836 | op->ops = &afs_inline_bulk_status_operation; | |
837 | afs_begin_vnode_operation(op); | |
838 | afs_wait_for_operation(op); | |
5cf9dd55 DH |
839 | } |
840 | ||
e49c7b2f DH |
841 | if (op->error == -ENOTSUPP) { |
842 | /* We could try FS.BulkStatus next, but this aborts the entire | |
843 | * op if any of the lookups fails - so, for the moment, revert | |
844 | * to FS.FetchStatus for op->file[1]. | |
845 | */ | |
846 | op->fetch_status.which = 1; | |
847 | op->ops = &afs_fetch_status_operation; | |
848 | afs_begin_vnode_operation(op); | |
849 | afs_wait_for_operation(op); | |
5cf9dd55 | 850 | } |
e49c7b2f | 851 | inode = ERR_PTR(op->error); |
5cf9dd55 | 852 | |
e49c7b2f DH |
853 | out_op: |
854 | if (op->error == 0) { | |
855 | inode = &op->file[1].vnode->vfs_inode; | |
856 | op->file[1].vnode = NULL; | |
5cf9dd55 DH |
857 | } |
858 | ||
e49c7b2f DH |
859 | if (op->file[0].scb.have_status) |
860 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; | |
861 | else | |
862 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; | |
863 | ret = afs_put_operation(op); | |
5cf9dd55 DH |
864 | out: |
865 | kfree(cookie); | |
e49c7b2f DH |
866 | _leave(""); |
867 | return inode ?: ERR_PTR(ret); | |
5cf9dd55 DH |
868 | } |
869 | ||
6f8880d8 DH |
870 | /* |
871 | * Look up an entry in a directory with @sys substitution. | |
872 | */ | |
873 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
874 | struct key *key) | |
875 | { | |
876 | struct afs_sysnames *subs; | |
877 | struct afs_net *net = afs_i2net(dir); | |
878 | struct dentry *ret; | |
879 | char *buf, *p, *name; | |
880 | int len, i; | |
881 | ||
882 | _enter(""); | |
883 | ||
884 | ret = ERR_PTR(-ENOMEM); | |
885 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
886 | if (!buf) | |
887 | goto out_p; | |
888 | if (dentry->d_name.len > 4) { | |
889 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
890 | p += dentry->d_name.len - 4; | |
891 | } | |
892 | ||
893 | /* There is an ordered list of substitutes that we have to try. */ | |
894 | read_lock(&net->sysnames_lock); | |
895 | subs = net->sysnames; | |
896 | refcount_inc(&subs->usage); | |
897 | read_unlock(&net->sysnames_lock); | |
898 | ||
899 | for (i = 0; i < subs->nr; i++) { | |
900 | name = subs->subs[i]; | |
901 | len = dentry->d_name.len - 4 + strlen(name); | |
902 | if (len >= AFSNAMEMAX) { | |
903 | ret = ERR_PTR(-ENAMETOOLONG); | |
904 | goto out_s; | |
905 | } | |
906 | ||
907 | strcpy(p, name); | |
908 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
909 | if (IS_ERR(ret) || d_is_positive(ret)) | |
910 | goto out_s; | |
911 | dput(ret); | |
912 | } | |
913 | ||
914 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
915 | * the cached dentry to hide changes to the sysnames list. | |
916 | */ | |
917 | ret = NULL; | |
918 | out_s: | |
919 | afs_put_sysnames(subs); | |
920 | kfree(buf); | |
921 | out_p: | |
922 | key_put(key); | |
923 | return ret; | |
924 | } | |
925 | ||
08e0e7c8 DH |
926 | /* |
927 | * look up an entry in a directory | |
928 | */ | |
260a9803 | 929 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 930 | unsigned int flags) |
08e0e7c8 | 931 | { |
5cf9dd55 | 932 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
40a708bd | 933 | struct afs_fid fid = {}; |
08e0e7c8 | 934 | struct inode *inode; |
34b2a88f | 935 | struct dentry *d; |
00d3b7a4 | 936 | struct key *key; |
08e0e7c8 DH |
937 | int ret; |
938 | ||
3b6492df | 939 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 940 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 941 | |
2b0143b5 | 942 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 943 | |
45222b9e | 944 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
945 | _leave(" = -ENAMETOOLONG"); |
946 | return ERR_PTR(-ENAMETOOLONG); | |
947 | } | |
948 | ||
5cf9dd55 | 949 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
950 | _leave(" = -ESTALE"); |
951 | return ERR_PTR(-ESTALE); | |
952 | } | |
953 | ||
5cf9dd55 | 954 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
955 | if (IS_ERR(key)) { |
956 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 957 | return ERR_CAST(key); |
00d3b7a4 DH |
958 | } |
959 | ||
5cf9dd55 | 960 | ret = afs_validate(dvnode, key); |
260a9803 DH |
961 | if (ret < 0) { |
962 | key_put(key); | |
963 | _leave(" = %d [val]", ret); | |
964 | return ERR_PTR(ret); | |
965 | } | |
966 | ||
6f8880d8 DH |
967 | if (dentry->d_name.len >= 4 && |
968 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
969 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
970 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
971 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
972 | return afs_lookup_atsys(dir, dentry, key); | |
973 | ||
d55b4da4 | 974 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 975 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 976 | key_put(key); |
f52b83b0 | 977 | if (inode == ERR_PTR(-ENOENT)) |
34b2a88f | 978 | inode = afs_try_auto_mntpt(dentry, dir); |
40a708bd DH |
979 | |
980 | if (!IS_ERR_OR_NULL(inode)) | |
981 | fid = AFS_FS_I(inode)->fid; | |
982 | ||
e49c7b2f | 983 | _debug("splice %px", dentry->d_inode); |
34b2a88f | 984 | d = d_splice_alias(inode, dentry); |
80548b03 | 985 | if (!IS_ERR_OR_NULL(d)) { |
34b2a88f | 986 | d->d_fsdata = dentry->d_fsdata; |
40a708bd | 987 | trace_afs_lookup(dvnode, &d->d_name, &fid); |
80548b03 | 988 | } else { |
40a708bd | 989 | trace_afs_lookup(dvnode, &dentry->d_name, &fid); |
80548b03 | 990 | } |
e49c7b2f | 991 | _leave(""); |
34b2a88f | 992 | return d; |
ec26815a | 993 | } |
1da177e4 | 994 | |
a0753c29 DH |
995 | /* |
996 | * Check the validity of a dentry under RCU conditions. | |
997 | */ | |
998 | static int afs_d_revalidate_rcu(struct dentry *dentry) | |
999 | { | |
1000 | struct afs_vnode *dvnode, *vnode; | |
1001 | struct dentry *parent; | |
1002 | struct inode *dir, *inode; | |
1003 | long dir_version, de_version; | |
1004 | ||
1005 | _enter("%p", dentry); | |
1006 | ||
1007 | /* Check the parent directory is still valid first. */ | |
1008 | parent = READ_ONCE(dentry->d_parent); | |
1009 | dir = d_inode_rcu(parent); | |
1010 | if (!dir) | |
1011 | return -ECHILD; | |
1012 | dvnode = AFS_FS_I(dir); | |
1013 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) | |
1014 | return -ECHILD; | |
1015 | ||
1016 | if (!afs_check_validity(dvnode)) | |
1017 | return -ECHILD; | |
1018 | ||
1019 | /* We only need to invalidate a dentry if the server's copy changed | |
1020 | * behind our back. If we made the change, it's no problem. Note that | |
1021 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1022 | * version. | |
1023 | */ | |
1024 | dir_version = (long)READ_ONCE(dvnode->status.data_version); | |
1025 | de_version = (long)READ_ONCE(dentry->d_fsdata); | |
1026 | if (de_version != dir_version) { | |
1027 | dir_version = (long)READ_ONCE(dvnode->invalid_before); | |
1028 | if (de_version - dir_version < 0) | |
1029 | return -ECHILD; | |
1030 | } | |
1031 | ||
1032 | /* Check to see if the vnode referred to by the dentry still | |
1033 | * has a callback. | |
1034 | */ | |
1035 | if (d_really_is_positive(dentry)) { | |
1036 | inode = d_inode_rcu(dentry); | |
1037 | if (inode) { | |
1038 | vnode = AFS_FS_I(inode); | |
1039 | if (!afs_check_validity(vnode)) | |
1040 | return -ECHILD; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | return 1; /* Still valid */ | |
1045 | } | |
1046 | ||
1da177e4 LT |
1047 | /* |
1048 | * check that a dentry lookup hit has found a valid entry | |
1049 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
1050 | * inode | |
1da177e4 | 1051 | */ |
0b728e19 | 1052 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1053 | { |
260a9803 | 1054 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 1055 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 1056 | struct dentry *parent; |
c435ee34 | 1057 | struct inode *inode; |
00d3b7a4 | 1058 | struct key *key; |
40fc8102 | 1059 | afs_dataversion_t dir_version, invalid_before; |
9dd0b82e | 1060 | long de_version; |
1da177e4 LT |
1061 | int ret; |
1062 | ||
0b728e19 | 1063 | if (flags & LOOKUP_RCU) |
a0753c29 | 1064 | return afs_d_revalidate_rcu(dentry); |
34286d66 | 1065 | |
c435ee34 DH |
1066 | if (d_really_is_positive(dentry)) { |
1067 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 1068 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 1069 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 1070 | vnode->flags); |
c435ee34 | 1071 | } else { |
a455589f | 1072 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 1073 | } |
1da177e4 | 1074 | |
260a9803 | 1075 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
1076 | if (IS_ERR(key)) |
1077 | key = NULL; | |
1078 | ||
c435ee34 DH |
1079 | if (d_really_is_positive(dentry)) { |
1080 | inode = d_inode(dentry); | |
1081 | if (inode) { | |
1082 | vnode = AFS_FS_I(inode); | |
1083 | afs_validate(vnode, key); | |
1084 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1085 | goto out_bad; | |
1086 | } | |
1087 | } | |
1088 | ||
1da177e4 | 1089 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 1090 | parent = dget_parent(dentry); |
2b0143b5 | 1091 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 1092 | |
260a9803 | 1093 | /* validate the parent directory */ |
c435ee34 | 1094 | afs_validate(dir, key); |
260a9803 DH |
1095 | |
1096 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 1097 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 1098 | goto out_bad_parent; |
1da177e4 LT |
1099 | } |
1100 | ||
a4ff7401 DH |
1101 | /* We only need to invalidate a dentry if the server's copy changed |
1102 | * behind our back. If we made the change, it's no problem. Note that | |
1103 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1104 | * version. | |
1105 | */ | |
9dd0b82e | 1106 | dir_version = dir->status.data_version; |
a4ff7401 | 1107 | de_version = (long)dentry->d_fsdata; |
9dd0b82e | 1108 | if (de_version == (long)dir_version) |
5dc84855 | 1109 | goto out_valid_noupdate; |
a4ff7401 | 1110 | |
40fc8102 DH |
1111 | invalid_before = dir->invalid_before; |
1112 | if (de_version - (long)invalid_before >= 0) | |
a4ff7401 | 1113 | goto out_valid; |
1da177e4 | 1114 | |
260a9803 | 1115 | _debug("dir modified"); |
d55b4da4 | 1116 | afs_stat_v(dir, n_reval); |
260a9803 DH |
1117 | |
1118 | /* search the directory for this vnode */ | |
9dd0b82e | 1119 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); |
260a9803 DH |
1120 | switch (ret) { |
1121 | case 0: | |
1122 | /* the filename maps to something */ | |
2b0143b5 | 1123 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
1124 | goto out_bad_parent; |
1125 | inode = d_inode(dentry); | |
1126 | if (is_bad_inode(inode)) { | |
a455589f AV |
1127 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
1128 | dentry); | |
c435ee34 | 1129 | goto out_bad_parent; |
1da177e4 LT |
1130 | } |
1131 | ||
c435ee34 DH |
1132 | vnode = AFS_FS_I(inode); |
1133 | ||
1da177e4 LT |
1134 | /* if the vnode ID has changed, then the dirent points to a |
1135 | * different file */ | |
08e0e7c8 | 1136 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 1137 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 1138 | dentry, fid.vnode, |
08e0e7c8 | 1139 | vnode->fid.vnode); |
1da177e4 LT |
1140 | goto not_found; |
1141 | } | |
1142 | ||
1143 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1144 | * been deleted and replaced, and the original vnode ID has |
1145 | * been reused */ | |
08e0e7c8 | 1146 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1147 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1148 | dentry, fid.unique, | |
7a224228 | 1149 | vnode->fid.unique, |
c435ee34 DH |
1150 | vnode->vfs_inode.i_generation); |
1151 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1152 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1153 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1154 | goto not_found; |
1da177e4 | 1155 | } |
260a9803 | 1156 | goto out_valid; |
08e0e7c8 | 1157 | |
260a9803 DH |
1158 | case -ENOENT: |
1159 | /* the filename is unknown */ | |
a455589f | 1160 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1161 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1162 | goto not_found; |
1163 | goto out_valid; | |
1da177e4 | 1164 | |
260a9803 | 1165 | default: |
a455589f AV |
1166 | _debug("failed to iterate dir %pd: %d", |
1167 | parent, ret); | |
c435ee34 | 1168 | goto out_bad_parent; |
08e0e7c8 DH |
1169 | } |
1170 | ||
ec26815a | 1171 | out_valid: |
9dd0b82e | 1172 | dentry->d_fsdata = (void *)(unsigned long)dir_version; |
5dc84855 | 1173 | out_valid_noupdate: |
1da177e4 | 1174 | dput(parent); |
00d3b7a4 | 1175 | key_put(key); |
1da177e4 LT |
1176 | _leave(" = 1 [valid]"); |
1177 | return 1; | |
1178 | ||
1179 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1180 | not_found: |
1da177e4 LT |
1181 | spin_lock(&dentry->d_lock); |
1182 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1183 | spin_unlock(&dentry->d_lock); | |
1184 | ||
c435ee34 | 1185 | out_bad_parent: |
a455589f | 1186 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1187 | dput(parent); |
c435ee34 | 1188 | out_bad: |
00d3b7a4 | 1189 | key_put(key); |
1da177e4 LT |
1190 | |
1191 | _leave(" = 0 [bad]"); | |
1192 | return 0; | |
ec26815a | 1193 | } |
1da177e4 | 1194 | |
1da177e4 LT |
1195 | /* |
1196 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1197 | * sleep) | |
1198 | * - called from dput() when d_count is going to 0. | |
1199 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1200 | */ | |
fe15ce44 | 1201 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1202 | { |
a455589f | 1203 | _enter("%pd", dentry); |
1da177e4 LT |
1204 | |
1205 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1206 | goto zap; | |
1207 | ||
2b0143b5 DH |
1208 | if (d_really_is_positive(dentry) && |
1209 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1210 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1211 | goto zap; |
1da177e4 LT |
1212 | |
1213 | _leave(" = 0 [keep]"); | |
1214 | return 0; | |
1215 | ||
ec26815a | 1216 | zap: |
1da177e4 LT |
1217 | _leave(" = 1 [zap]"); |
1218 | return 1; | |
ec26815a | 1219 | } |
260a9803 | 1220 | |
79ddbfa5 DH |
1221 | /* |
1222 | * Clean up sillyrename files on dentry removal. | |
1223 | */ | |
1224 | static void afs_d_iput(struct dentry *dentry, struct inode *inode) | |
1225 | { | |
1226 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1227 | afs_silly_iput(dentry, inode); | |
1228 | iput(inode); | |
1229 | } | |
1230 | ||
260a9803 DH |
1231 | /* |
1232 | * handle dentry release | |
1233 | */ | |
66c7e1d3 | 1234 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1235 | { |
a455589f | 1236 | _enter("%pd", dentry); |
260a9803 DH |
1237 | } |
1238 | ||
d2ddc776 DH |
1239 | /* |
1240 | * Create a new inode for create/mkdir/symlink | |
1241 | */ | |
e49c7b2f | 1242 | static void afs_vnode_new_inode(struct afs_operation *op) |
d2ddc776 | 1243 | { |
e49c7b2f | 1244 | struct afs_vnode_param *vp = &op->file[1]; |
5a813276 | 1245 | struct afs_vnode *vnode; |
d2ddc776 DH |
1246 | struct inode *inode; |
1247 | ||
e49c7b2f DH |
1248 | _enter(""); |
1249 | ||
1250 | ASSERTCMP(op->error, ==, 0); | |
d2ddc776 | 1251 | |
e49c7b2f | 1252 | inode = afs_iget(op, vp); |
d2ddc776 DH |
1253 | if (IS_ERR(inode)) { |
1254 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1255 | * the new directory on the server. | |
1256 | */ | |
e49c7b2f | 1257 | op->error = PTR_ERR(inode); |
d2ddc776 DH |
1258 | return; |
1259 | } | |
1260 | ||
5a813276 DH |
1261 | vnode = AFS_FS_I(inode); |
1262 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
e49c7b2f DH |
1263 | if (!op->error) |
1264 | afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); | |
1265 | d_instantiate(op->dentry, inode); | |
d2ddc776 DH |
1266 | } |
1267 | ||
e49c7b2f | 1268 | static void afs_create_success(struct afs_operation *op) |
b8359153 | 1269 | { |
e49c7b2f DH |
1270 | _enter("op=%08x", op->debug_id); |
1271 | afs_check_for_remote_deletion(op, op->file[0].vnode); | |
1272 | afs_vnode_commit_status(op, &op->file[0]); | |
1273 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1274 | afs_vnode_new_inode(op); | |
b8359153 DH |
1275 | } |
1276 | ||
e49c7b2f | 1277 | static void afs_create_edit_dir(struct afs_operation *op) |
9dd0b82e | 1278 | { |
e49c7b2f DH |
1279 | struct afs_vnode_param *dvp = &op->file[0]; |
1280 | struct afs_vnode_param *vp = &op->file[1]; | |
1281 | struct afs_vnode *dvnode = dvp->vnode; | |
1282 | ||
1283 | _enter("op=%08x", op->debug_id); | |
1284 | ||
1285 | down_write(&dvnode->validate_lock); | |
1286 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1287 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1288 | afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, | |
1289 | op->create.reason); | |
1290 | up_write(&dvnode->validate_lock); | |
9dd0b82e DH |
1291 | } |
1292 | ||
e49c7b2f DH |
1293 | static void afs_create_put(struct afs_operation *op) |
1294 | { | |
1295 | _enter("op=%08x", op->debug_id); | |
1296 | ||
1297 | if (op->error) | |
1298 | d_drop(op->dentry); | |
1299 | } | |
1300 | ||
1301 | static const struct afs_operation_ops afs_mkdir_operation = { | |
1302 | .issue_afs_rpc = afs_fs_make_dir, | |
1303 | .issue_yfs_rpc = yfs_fs_make_dir, | |
1304 | .success = afs_create_success, | |
1305 | .edit_dir = afs_create_edit_dir, | |
1306 | .put = afs_create_put, | |
1307 | }; | |
1308 | ||
260a9803 DH |
1309 | /* |
1310 | * create a directory on an AFS filesystem | |
1311 | */ | |
18bb1db3 | 1312 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1313 | { |
e49c7b2f | 1314 | struct afs_operation *op; |
d2ddc776 | 1315 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 | 1316 | |
3b6492df | 1317 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1318 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1319 | |
e49c7b2f DH |
1320 | op = afs_alloc_operation(NULL, dvnode->volume); |
1321 | if (IS_ERR(op)) { | |
1322 | d_drop(dentry); | |
1323 | return PTR_ERR(op); | |
2105c282 | 1324 | } |
63a4681f | 1325 | |
e49c7b2f DH |
1326 | afs_op_set_vnode(op, 0, dvnode); |
1327 | op->file[0].dv_delta = 1; | |
1328 | op->dentry = dentry; | |
1329 | op->create.mode = S_IFDIR | mode; | |
1330 | op->create.reason = afs_edit_dir_for_mkdir; | |
1331 | op->ops = &afs_mkdir_operation; | |
1332 | return afs_do_sync_operation(op); | |
260a9803 DH |
1333 | } |
1334 | ||
d2ddc776 DH |
1335 | /* |
1336 | * Remove a subdir from a directory. | |
1337 | */ | |
1338 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1339 | { | |
1340 | if (d_really_is_positive(dentry)) { | |
1341 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1342 | ||
1343 | clear_nlink(&vnode->vfs_inode); | |
1344 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1345 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1346 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1347 | } |
1348 | } | |
1349 | ||
e49c7b2f DH |
1350 | static void afs_rmdir_success(struct afs_operation *op) |
1351 | { | |
1352 | _enter("op=%08x", op->debug_id); | |
1353 | afs_check_for_remote_deletion(op, op->file[0].vnode); | |
1354 | afs_vnode_commit_status(op, &op->file[0]); | |
1355 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1356 | } | |
1357 | ||
1358 | static void afs_rmdir_edit_dir(struct afs_operation *op) | |
1359 | { | |
1360 | struct afs_vnode_param *dvp = &op->file[0]; | |
1361 | struct afs_vnode *dvnode = dvp->vnode; | |
1362 | ||
1363 | _enter("op=%08x", op->debug_id); | |
1364 | afs_dir_remove_subdir(op->dentry); | |
1365 | ||
1366 | down_write(&dvnode->validate_lock); | |
1367 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1368 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1369 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1370 | afs_edit_dir_for_rmdir); | |
1371 | up_write(&dvnode->validate_lock); | |
1372 | } | |
1373 | ||
1374 | static void afs_rmdir_put(struct afs_operation *op) | |
1375 | { | |
1376 | _enter("op=%08x", op->debug_id); | |
1377 | if (op->file[1].vnode) | |
1378 | up_write(&op->file[1].vnode->rmdir_lock); | |
1379 | } | |
1380 | ||
1381 | static const struct afs_operation_ops afs_rmdir_operation = { | |
1382 | .issue_afs_rpc = afs_fs_remove_dir, | |
1383 | .issue_yfs_rpc = yfs_fs_remove_dir, | |
1384 | .success = afs_rmdir_success, | |
1385 | .edit_dir = afs_rmdir_edit_dir, | |
1386 | .put = afs_rmdir_put, | |
1387 | }; | |
1388 | ||
260a9803 DH |
1389 | /* |
1390 | * remove a directory from an AFS filesystem | |
1391 | */ | |
1392 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1393 | { | |
e49c7b2f | 1394 | struct afs_operation *op; |
f58db83f | 1395 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 DH |
1396 | int ret; |
1397 | ||
3b6492df | 1398 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1399 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1400 | |
e49c7b2f DH |
1401 | op = afs_alloc_operation(NULL, dvnode->volume); |
1402 | if (IS_ERR(op)) | |
1403 | return PTR_ERR(op); | |
a58823ac | 1404 | |
e49c7b2f DH |
1405 | afs_op_set_vnode(op, 0, dvnode); |
1406 | op->file[0].dv_delta = 1; | |
1407 | ||
1408 | op->dentry = dentry; | |
1409 | op->ops = &afs_rmdir_operation; | |
260a9803 | 1410 | |
f58db83f DH |
1411 | /* Try to make sure we have a callback promise on the victim. */ |
1412 | if (d_really_is_positive(dentry)) { | |
1413 | vnode = AFS_FS_I(d_inode(dentry)); | |
e49c7b2f | 1414 | ret = afs_validate(vnode, op->key); |
f58db83f | 1415 | if (ret < 0) |
e49c7b2f | 1416 | goto error; |
f58db83f DH |
1417 | } |
1418 | ||
79ddbfa5 DH |
1419 | if (vnode) { |
1420 | ret = down_write_killable(&vnode->rmdir_lock); | |
1421 | if (ret < 0) | |
e49c7b2f DH |
1422 | goto error; |
1423 | op->file[1].vnode = vnode; | |
79ddbfa5 DH |
1424 | } |
1425 | ||
e49c7b2f | 1426 | return afs_do_sync_operation(op); |
260a9803 | 1427 | |
260a9803 | 1428 | error: |
e49c7b2f | 1429 | return afs_put_operation(op); |
260a9803 DH |
1430 | } |
1431 | ||
1432 | /* | |
d2ddc776 DH |
1433 | * Remove a link to a file or symlink from a directory. |
1434 | * | |
1435 | * If the file was not deleted due to excess hard links, the fileserver will | |
1436 | * break the callback promise on the file - if it had one - before it returns | |
1437 | * to us, and if it was deleted, it won't | |
1438 | * | |
1439 | * However, if we didn't have a callback promise outstanding, or it was | |
1440 | * outstanding on a different server, then it won't break it either... | |
1441 | */ | |
e49c7b2f | 1442 | static void afs_dir_remove_link(struct afs_operation *op) |
d2ddc776 | 1443 | { |
e49c7b2f DH |
1444 | struct afs_vnode *dvnode = op->file[0].vnode; |
1445 | struct afs_vnode *vnode = op->file[1].vnode; | |
1446 | struct dentry *dentry = op->dentry; | |
1447 | int ret; | |
d2ddc776 | 1448 | |
e49c7b2f DH |
1449 | if (op->error != 0 || |
1450 | (op->file[1].scb.have_status && op->file[1].scb.have_error)) | |
1451 | return; | |
1452 | if (d_really_is_positive(dentry)) | |
1453 | return; | |
d2ddc776 | 1454 | |
e49c7b2f DH |
1455 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1456 | /* Already done */ | |
1457 | } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
1458 | write_seqlock(&vnode->cb_lock); | |
1459 | drop_nlink(&vnode->vfs_inode); | |
1460 | if (vnode->vfs_inode.i_nlink == 0) { | |
1461 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1462 | __afs_break_callback(vnode, afs_cb_break_for_unlink); | |
1463 | } | |
1464 | write_sequnlock(&vnode->cb_lock); | |
1465 | } else { | |
1466 | afs_break_callback(vnode, afs_cb_break_for_unlink); | |
440fbc3a | 1467 | |
e49c7b2f DH |
1468 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
1469 | _debug("AFS_VNODE_DELETED"); | |
440fbc3a | 1470 | |
e49c7b2f DH |
1471 | ret = afs_validate(vnode, op->key); |
1472 | if (ret != -ESTALE) | |
1473 | op->error = ret; | |
d2ddc776 DH |
1474 | } |
1475 | ||
e49c7b2f DH |
1476 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); |
1477 | } | |
1478 | ||
1479 | static void afs_unlink_success(struct afs_operation *op) | |
1480 | { | |
1481 | _enter("op=%08x", op->debug_id); | |
1482 | afs_check_for_remote_deletion(op, op->file[0].vnode); | |
1483 | afs_vnode_commit_status(op, &op->file[0]); | |
1484 | afs_vnode_commit_status(op, &op->file[1]); | |
1485 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1486 | afs_dir_remove_link(op); | |
1487 | } | |
1488 | ||
1489 | static void afs_unlink_edit_dir(struct afs_operation *op) | |
1490 | { | |
1491 | struct afs_vnode_param *dvp = &op->file[0]; | |
1492 | struct afs_vnode *dvnode = dvp->vnode; | |
1493 | ||
1494 | _enter("op=%08x", op->debug_id); | |
1495 | down_write(&dvnode->validate_lock); | |
1496 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1497 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1498 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1499 | afs_edit_dir_for_unlink); | |
1500 | up_write(&dvnode->validate_lock); | |
d2ddc776 DH |
1501 | } |
1502 | ||
e49c7b2f DH |
1503 | static void afs_unlink_put(struct afs_operation *op) |
1504 | { | |
1505 | _enter("op=%08x", op->debug_id); | |
1506 | if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) | |
1507 | d_rehash(op->dentry); | |
1508 | } | |
1509 | ||
1510 | static const struct afs_operation_ops afs_unlink_operation = { | |
1511 | .issue_afs_rpc = afs_fs_remove_file, | |
1512 | .issue_yfs_rpc = yfs_fs_remove_file, | |
1513 | .success = afs_unlink_success, | |
1514 | .edit_dir = afs_unlink_edit_dir, | |
1515 | .put = afs_unlink_put, | |
1516 | }; | |
1517 | ||
d2ddc776 DH |
1518 | /* |
1519 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1520 | */ |
1521 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1522 | { | |
e49c7b2f | 1523 | struct afs_operation *op; |
fa59f52f DH |
1524 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1525 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1526 | int ret; |
1527 | ||
3b6492df | 1528 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1529 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1530 | |
45222b9e | 1531 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1532 | return -ENAMETOOLONG; |
260a9803 | 1533 | |
e49c7b2f DH |
1534 | op = afs_alloc_operation(NULL, dvnode->volume); |
1535 | if (IS_ERR(op)) | |
1536 | return PTR_ERR(op); | |
a58823ac | 1537 | |
e49c7b2f DH |
1538 | afs_op_set_vnode(op, 0, dvnode); |
1539 | op->file[0].dv_delta = 1; | |
260a9803 | 1540 | |
d2ddc776 | 1541 | /* Try to make sure we have a callback promise on the victim. */ |
e49c7b2f DH |
1542 | ret = afs_validate(vnode, op->key); |
1543 | if (ret < 0) { | |
1544 | op->error = ret; | |
1545 | goto error; | |
1546 | } | |
260a9803 | 1547 | |
79ddbfa5 | 1548 | spin_lock(&dentry->d_lock); |
fa59f52f | 1549 | if (d_count(dentry) > 1) { |
79ddbfa5 DH |
1550 | spin_unlock(&dentry->d_lock); |
1551 | /* Start asynchronous writeout of the inode */ | |
1552 | write_inode_now(d_inode(dentry), 0); | |
e49c7b2f DH |
1553 | op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); |
1554 | goto error; | |
79ddbfa5 DH |
1555 | } |
1556 | if (!d_unhashed(dentry)) { | |
1557 | /* Prevent a race with RCU lookup. */ | |
1558 | __d_drop(dentry); | |
e49c7b2f | 1559 | op->unlink.need_rehash = true; |
79ddbfa5 DH |
1560 | } |
1561 | spin_unlock(&dentry->d_lock); | |
1562 | ||
e49c7b2f DH |
1563 | op->file[1].vnode = vnode; |
1564 | op->dentry = dentry; | |
1565 | op->ops = &afs_unlink_operation; | |
1566 | return afs_do_sync_operation(op); | |
79ddbfa5 | 1567 | |
260a9803 | 1568 | error: |
e49c7b2f | 1569 | return afs_put_operation(op); |
260a9803 DH |
1570 | } |
1571 | ||
e49c7b2f DH |
1572 | static const struct afs_operation_ops afs_create_operation = { |
1573 | .issue_afs_rpc = afs_fs_create_file, | |
1574 | .issue_yfs_rpc = yfs_fs_create_file, | |
1575 | .success = afs_create_success, | |
1576 | .edit_dir = afs_create_edit_dir, | |
1577 | .put = afs_create_put, | |
1578 | }; | |
1579 | ||
260a9803 DH |
1580 | /* |
1581 | * create a regular file on an AFS filesystem | |
1582 | */ | |
4acdaf27 | 1583 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1584 | bool excl) |
260a9803 | 1585 | { |
e49c7b2f | 1586 | struct afs_operation *op; |
43dd388b | 1587 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
e49c7b2f | 1588 | int ret = -ENAMETOOLONG; |
260a9803 | 1589 | |
e49c7b2f | 1590 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1591 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1592 | |
d2ddc776 DH |
1593 | if (dentry->d_name.len >= AFSNAMEMAX) |
1594 | goto error; | |
1595 | ||
e49c7b2f DH |
1596 | op = afs_alloc_operation(NULL, dvnode->volume); |
1597 | if (IS_ERR(op)) { | |
1598 | ret = PTR_ERR(op); | |
260a9803 DH |
1599 | goto error; |
1600 | } | |
1601 | ||
e49c7b2f DH |
1602 | afs_op_set_vnode(op, 0, dvnode); |
1603 | op->file[0].dv_delta = 1; | |
63a4681f | 1604 | |
e49c7b2f DH |
1605 | op->dentry = dentry; |
1606 | op->create.mode = S_IFREG | mode; | |
1607 | op->create.reason = afs_edit_dir_for_create; | |
1608 | op->ops = &afs_create_operation; | |
1609 | return afs_do_sync_operation(op); | |
260a9803 | 1610 | |
260a9803 DH |
1611 | error: |
1612 | d_drop(dentry); | |
1613 | _leave(" = %d", ret); | |
1614 | return ret; | |
1615 | } | |
1616 | ||
e49c7b2f DH |
1617 | static void afs_link_success(struct afs_operation *op) |
1618 | { | |
1619 | struct afs_vnode_param *dvp = &op->file[0]; | |
1620 | struct afs_vnode_param *vp = &op->file[1]; | |
1621 | ||
1622 | _enter("op=%08x", op->debug_id); | |
1623 | afs_vnode_commit_status(op, dvp); | |
1624 | afs_vnode_commit_status(op, vp); | |
1625 | afs_update_dentry_version(op, dvp, op->dentry); | |
1626 | if (op->dentry_2->d_parent == op->dentry->d_parent) | |
1627 | afs_update_dentry_version(op, dvp, op->dentry_2); | |
1628 | ihold(&vp->vnode->vfs_inode); | |
1629 | d_instantiate(op->dentry, &vp->vnode->vfs_inode); | |
1630 | } | |
1631 | ||
1632 | static void afs_link_put(struct afs_operation *op) | |
1633 | { | |
1634 | _enter("op=%08x", op->debug_id); | |
1635 | if (op->error) | |
1636 | d_drop(op->dentry); | |
1637 | } | |
1638 | ||
1639 | static const struct afs_operation_ops afs_link_operation = { | |
1640 | .issue_afs_rpc = afs_fs_link, | |
1641 | .issue_yfs_rpc = yfs_fs_link, | |
1642 | .success = afs_link_success, | |
1643 | .edit_dir = afs_create_edit_dir, | |
1644 | .put = afs_link_put, | |
1645 | }; | |
1646 | ||
260a9803 DH |
1647 | /* |
1648 | * create a hard link between files in an AFS filesystem | |
1649 | */ | |
1650 | static int afs_link(struct dentry *from, struct inode *dir, | |
1651 | struct dentry *dentry) | |
1652 | { | |
e49c7b2f | 1653 | struct afs_operation *op; |
a58823ac DH |
1654 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1655 | struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); | |
e49c7b2f | 1656 | int ret = -ENAMETOOLONG; |
260a9803 | 1657 | |
3b6492df | 1658 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1659 | vnode->fid.vid, vnode->fid.vnode, |
1660 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1661 | dentry); |
260a9803 | 1662 | |
d2ddc776 DH |
1663 | if (dentry->d_name.len >= AFSNAMEMAX) |
1664 | goto error; | |
1665 | ||
e49c7b2f DH |
1666 | op = afs_alloc_operation(NULL, dvnode->volume); |
1667 | if (IS_ERR(op)) { | |
1668 | ret = PTR_ERR(op); | |
a58823ac | 1669 | goto error; |
260a9803 DH |
1670 | } |
1671 | ||
e49c7b2f DH |
1672 | afs_op_set_vnode(op, 0, dvnode); |
1673 | afs_op_set_vnode(op, 1, vnode); | |
1674 | op->file[0].dv_delta = 1; | |
260a9803 | 1675 | |
e49c7b2f DH |
1676 | op->dentry = dentry; |
1677 | op->dentry_2 = from; | |
1678 | op->ops = &afs_link_operation; | |
1679 | op->create.reason = afs_edit_dir_for_link; | |
1680 | return afs_do_sync_operation(op); | |
63a4681f | 1681 | |
260a9803 DH |
1682 | error: |
1683 | d_drop(dentry); | |
1684 | _leave(" = %d", ret); | |
1685 | return ret; | |
1686 | } | |
1687 | ||
e49c7b2f DH |
1688 | static const struct afs_operation_ops afs_symlink_operation = { |
1689 | .issue_afs_rpc = afs_fs_symlink, | |
1690 | .issue_yfs_rpc = yfs_fs_symlink, | |
1691 | .success = afs_create_success, | |
1692 | .edit_dir = afs_create_edit_dir, | |
1693 | .put = afs_create_put, | |
1694 | }; | |
1695 | ||
260a9803 DH |
1696 | /* |
1697 | * create a symlink in an AFS filesystem | |
1698 | */ | |
1699 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1700 | const char *content) | |
1701 | { | |
e49c7b2f | 1702 | struct afs_operation *op; |
d2ddc776 | 1703 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1704 | int ret; |
1705 | ||
3b6492df | 1706 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1707 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1708 | content); |
1709 | ||
d2ddc776 DH |
1710 | ret = -ENAMETOOLONG; |
1711 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1712 | goto error; | |
1713 | ||
260a9803 | 1714 | ret = -EINVAL; |
45222b9e | 1715 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1716 | goto error; |
1717 | ||
e49c7b2f DH |
1718 | op = afs_alloc_operation(NULL, dvnode->volume); |
1719 | if (IS_ERR(op)) { | |
1720 | ret = PTR_ERR(op); | |
a58823ac | 1721 | goto error; |
260a9803 DH |
1722 | } |
1723 | ||
e49c7b2f DH |
1724 | afs_op_set_vnode(op, 0, dvnode); |
1725 | op->file[0].dv_delta = 1; | |
260a9803 | 1726 | |
e49c7b2f DH |
1727 | op->dentry = dentry; |
1728 | op->ops = &afs_symlink_operation; | |
1729 | op->create.reason = afs_edit_dir_for_symlink; | |
1730 | op->create.symlink = content; | |
1731 | return afs_do_sync_operation(op); | |
260a9803 | 1732 | |
260a9803 DH |
1733 | error: |
1734 | d_drop(dentry); | |
1735 | _leave(" = %d", ret); | |
1736 | return ret; | |
1737 | } | |
1738 | ||
e49c7b2f DH |
1739 | static void afs_rename_success(struct afs_operation *op) |
1740 | { | |
1741 | _enter("op=%08x", op->debug_id); | |
1742 | ||
1743 | afs_vnode_commit_status(op, &op->file[0]); | |
1744 | if (op->file[1].vnode != op->file[0].vnode) | |
1745 | afs_vnode_commit_status(op, &op->file[1]); | |
1746 | } | |
1747 | ||
1748 | static void afs_rename_edit_dir(struct afs_operation *op) | |
1749 | { | |
1750 | struct afs_vnode_param *orig_dvp = &op->file[0]; | |
1751 | struct afs_vnode_param *new_dvp = &op->file[1]; | |
1752 | struct afs_vnode *orig_dvnode = orig_dvp->vnode; | |
1753 | struct afs_vnode *new_dvnode = new_dvp->vnode; | |
1754 | struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); | |
1755 | struct dentry *old_dentry = op->dentry; | |
1756 | struct dentry *new_dentry = op->dentry_2; | |
1757 | struct inode *new_inode; | |
1758 | ||
1759 | _enter("op=%08x", op->debug_id); | |
1760 | ||
1761 | if (op->rename.rehash) { | |
1762 | d_rehash(op->rename.rehash); | |
1763 | op->rename.rehash = NULL; | |
1764 | } | |
1765 | ||
1766 | down_write(&orig_dvnode->validate_lock); | |
1767 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && | |
1768 | orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) | |
1769 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1770 | afs_edit_dir_for_rename_0); | |
1771 | ||
1772 | if (new_dvnode != orig_dvnode) { | |
1773 | up_write(&orig_dvnode->validate_lock); | |
1774 | down_write(&new_dvnode->validate_lock); | |
1775 | } | |
1776 | ||
1777 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && | |
1778 | new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { | |
1779 | if (!op->rename.new_negative) | |
1780 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1781 | afs_edit_dir_for_rename_1); | |
1782 | ||
1783 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1784 | &vnode->fid, afs_edit_dir_for_rename_2); | |
1785 | } | |
1786 | ||
1787 | new_inode = d_inode(new_dentry); | |
1788 | if (new_inode) { | |
1789 | spin_lock(&new_inode->i_lock); | |
1790 | if (new_inode->i_nlink > 0) | |
1791 | drop_nlink(new_inode); | |
1792 | spin_unlock(&new_inode->i_lock); | |
1793 | } | |
1794 | ||
1795 | /* Now we can update d_fsdata on the dentries to reflect their | |
1796 | * new parent's data_version. | |
1797 | * | |
1798 | * Note that if we ever implement RENAME_EXCHANGE, we'll have | |
1799 | * to update both dentries with opposing dir versions. | |
1800 | */ | |
1801 | afs_update_dentry_version(op, new_dvp, op->dentry); | |
1802 | afs_update_dentry_version(op, new_dvp, op->dentry_2); | |
1803 | ||
1804 | d_move(old_dentry, new_dentry); | |
1805 | ||
1806 | up_write(&new_dvnode->validate_lock); | |
1807 | } | |
1808 | ||
1809 | static void afs_rename_put(struct afs_operation *op) | |
1810 | { | |
1811 | _enter("op=%08x", op->debug_id); | |
1812 | if (op->rename.rehash) | |
1813 | d_rehash(op->rename.rehash); | |
1814 | dput(op->rename.tmp); | |
1815 | if (op->error) | |
1816 | d_rehash(op->dentry); | |
1817 | } | |
1818 | ||
1819 | static const struct afs_operation_ops afs_rename_operation = { | |
1820 | .issue_afs_rpc = afs_fs_rename, | |
1821 | .issue_yfs_rpc = yfs_fs_rename, | |
1822 | .success = afs_rename_success, | |
1823 | .edit_dir = afs_rename_edit_dir, | |
1824 | .put = afs_rename_put, | |
1825 | }; | |
1826 | ||
260a9803 DH |
1827 | /* |
1828 | * rename a file in an AFS filesystem and/or move it between directories | |
1829 | */ | |
1830 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1831 | struct inode *new_dir, struct dentry *new_dentry, |
1832 | unsigned int flags) | |
260a9803 | 1833 | { |
e49c7b2f | 1834 | struct afs_operation *op; |
260a9803 | 1835 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
260a9803 DH |
1836 | int ret; |
1837 | ||
1cd66c93 MS |
1838 | if (flags) |
1839 | return -EINVAL; | |
1840 | ||
79ddbfa5 DH |
1841 | /* Don't allow silly-rename files be moved around. */ |
1842 | if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1843 | return -EINVAL; | |
1844 | ||
2b0143b5 | 1845 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1846 | orig_dvnode = AFS_FS_I(old_dir); |
1847 | new_dvnode = AFS_FS_I(new_dir); | |
1848 | ||
3b6492df | 1849 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1850 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1851 | vnode->fid.vid, vnode->fid.vnode, | |
1852 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1853 | new_dentry); |
260a9803 | 1854 | |
e49c7b2f DH |
1855 | op = afs_alloc_operation(NULL, orig_dvnode->volume); |
1856 | if (IS_ERR(op)) | |
1857 | return PTR_ERR(op); | |
a58823ac | 1858 | |
e49c7b2f DH |
1859 | afs_op_set_vnode(op, 0, orig_dvnode); |
1860 | afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ | |
1861 | op->file[0].dv_delta = 1; | |
1862 | op->file[1].dv_delta = 1; | |
1863 | ||
1864 | op->dentry = old_dentry; | |
1865 | op->dentry_2 = new_dentry; | |
1866 | op->rename.new_negative = d_is_negative(new_dentry); | |
1867 | op->ops = &afs_rename_operation; | |
260a9803 | 1868 | |
79ddbfa5 DH |
1869 | /* For non-directories, check whether the target is busy and if so, |
1870 | * make a copy of the dentry and then do a silly-rename. If the | |
1871 | * silly-rename succeeds, the copied dentry is hashed and becomes the | |
1872 | * new target. | |
1873 | */ | |
1874 | if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { | |
1875 | /* To prevent any new references to the target during the | |
1876 | * rename, we unhash the dentry in advance. | |
1877 | */ | |
1878 | if (!d_unhashed(new_dentry)) { | |
1879 | d_drop(new_dentry); | |
e49c7b2f | 1880 | op->rename.rehash = new_dentry; |
79ddbfa5 DH |
1881 | } |
1882 | ||
1883 | if (d_count(new_dentry) > 2) { | |
1884 | /* copy the target dentry's name */ | |
1885 | ret = -ENOMEM; | |
e49c7b2f DH |
1886 | op->rename.tmp = d_alloc(new_dentry->d_parent, |
1887 | &new_dentry->d_name); | |
1888 | if (!op->rename.tmp) | |
1889 | goto error; | |
79ddbfa5 DH |
1890 | |
1891 | ret = afs_sillyrename(new_dvnode, | |
1892 | AFS_FS_I(d_inode(new_dentry)), | |
e49c7b2f | 1893 | new_dentry, op->key); |
79ddbfa5 | 1894 | if (ret) |
e49c7b2f | 1895 | goto error; |
79ddbfa5 | 1896 | |
e49c7b2f DH |
1897 | op->dentry_2 = op->rename.tmp; |
1898 | op->rename.rehash = NULL; | |
1899 | op->rename.new_negative = true; | |
79ddbfa5 DH |
1900 | } |
1901 | } | |
1902 | ||
9dd0b82e DH |
1903 | /* This bit is potentially nasty as there's a potential race with |
1904 | * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry | |
1905 | * to reflect it's new parent's new data_version after the op, but | |
1906 | * d_revalidate may see old_dentry between the op having taken place | |
1907 | * and the version being updated. | |
1908 | * | |
1909 | * So drop the old_dentry for now to make other threads go through | |
1910 | * lookup instead - which we hold a lock against. | |
1911 | */ | |
1912 | d_drop(old_dentry); | |
1913 | ||
e49c7b2f | 1914 | return afs_do_sync_operation(op); |
63a4681f | 1915 | |
260a9803 | 1916 | error: |
e49c7b2f | 1917 | return afs_put_operation(op); |
260a9803 | 1918 | } |
f3ddee8d DH |
1919 | |
1920 | /* | |
1921 | * Release a directory page and clean up its private state if it's not busy | |
1922 | * - return true if the page can now be released, false if not | |
1923 | */ | |
1924 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1925 | { | |
1926 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1927 | ||
3b6492df | 1928 | _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); |
f3ddee8d DH |
1929 | |
1930 | set_page_private(page, 0); | |
1931 | ClearPagePrivate(page); | |
1932 | ||
1933 | /* The directory will need reloading. */ | |
1934 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1935 | afs_stat_v(dvnode, n_relpg); | |
1936 | return 1; | |
1937 | } | |
1938 | ||
1939 | /* | |
1940 | * invalidate part or all of a page | |
1941 | * - release a page and clean up its private data if offset is 0 (indicating | |
1942 | * the entire page) | |
1943 | */ | |
1944 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1945 | unsigned int length) | |
1946 | { | |
1947 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1948 | ||
1949 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1950 | ||
1951 | BUG_ON(!PageLocked(page)); | |
1952 | ||
1953 | /* The directory will need reloading. */ | |
1954 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1955 | afs_stat_v(dvnode, n_inval); | |
1956 | ||
1957 | /* we clean up only if the entire page is being invalidated */ | |
1958 | if (offset == 0 && length == PAGE_SIZE) { | |
1959 | set_page_private(page, 0); | |
1960 | ClearPagePrivate(page); | |
1961 | } | |
1962 | } |