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1da177e4 LT |
1 | /* dir.c: AFS filesystem directory handling |
2 | * | |
f3ddee8d | 3 | * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
1da177e4 | 13 | #include <linux/fs.h> |
34286d66 | 14 | #include <linux/namei.h> |
1da177e4 | 15 | #include <linux/pagemap.h> |
f3ddee8d | 16 | #include <linux/swap.h> |
00d3b7a4 | 17 | #include <linux/ctype.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
f3ddee8d | 19 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 20 | #include "internal.h" |
4ea219a8 | 21 | #include "xdr_fs.h" |
1da177e4 | 22 | |
260a9803 | 23 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 24 | unsigned int flags); |
1da177e4 | 25 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 26 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 27 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 28 | static int afs_d_delete(const struct dentry *dentry); |
79ddbfa5 | 29 | static void afs_d_iput(struct dentry *dentry, struct inode *inode); |
5cf9dd55 | 30 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 31 | loff_t fpos, u64 ino, unsigned dtype); |
5cf9dd55 DH |
32 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
33 | loff_t fpos, u64 ino, unsigned dtype); | |
4acdaf27 | 34 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 35 | bool excl); |
18bb1db3 | 36 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
260a9803 DH |
37 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
38 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
39 | static int afs_link(struct dentry *from, struct inode *dir, | |
40 | struct dentry *dentry); | |
41 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
42 | const char *content); | |
43 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
44 | struct inode *new_dir, struct dentry *new_dentry, |
45 | unsigned int flags); | |
f3ddee8d DH |
46 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
47 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
48 | unsigned int length); | |
49 | ||
50 | static int afs_dir_set_page_dirty(struct page *page) | |
51 | { | |
52 | BUG(); /* This should never happen. */ | |
53 | } | |
1da177e4 | 54 | |
4b6f5d20 | 55 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 56 | .open = afs_dir_open, |
00d3b7a4 | 57 | .release = afs_release, |
29884eff | 58 | .iterate_shared = afs_readdir, |
e8d6c554 | 59 | .lock = afs_lock, |
3222a3e5 | 60 | .llseek = generic_file_llseek, |
1da177e4 LT |
61 | }; |
62 | ||
754661f1 | 63 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
64 | .create = afs_create, |
65 | .lookup = afs_lookup, | |
66 | .link = afs_link, | |
67 | .unlink = afs_unlink, | |
68 | .symlink = afs_symlink, | |
69 | .mkdir = afs_mkdir, | |
70 | .rmdir = afs_rmdir, | |
2773bf00 | 71 | .rename = afs_rename, |
00d3b7a4 | 72 | .permission = afs_permission, |
416351f2 | 73 | .getattr = afs_getattr, |
31143d5d | 74 | .setattr = afs_setattr, |
d3e3b7ea | 75 | .listxattr = afs_listxattr, |
1da177e4 LT |
76 | }; |
77 | ||
f3ddee8d DH |
78 | const struct address_space_operations afs_dir_aops = { |
79 | .set_page_dirty = afs_dir_set_page_dirty, | |
80 | .releasepage = afs_dir_releasepage, | |
81 | .invalidatepage = afs_dir_invalidatepage, | |
82 | }; | |
83 | ||
d61dcce2 | 84 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
85 | .d_revalidate = afs_d_revalidate, |
86 | .d_delete = afs_d_delete, | |
260a9803 | 87 | .d_release = afs_d_release, |
d18610b0 | 88 | .d_automount = afs_d_automount, |
79ddbfa5 | 89 | .d_iput = afs_d_iput, |
1da177e4 LT |
90 | }; |
91 | ||
5cf9dd55 DH |
92 | struct afs_lookup_one_cookie { |
93 | struct dir_context ctx; | |
94 | struct qstr name; | |
95 | bool found; | |
96 | struct afs_fid fid; | |
97 | }; | |
98 | ||
260a9803 | 99 | struct afs_lookup_cookie { |
5cf9dd55 DH |
100 | struct dir_context ctx; |
101 | struct qstr name; | |
102 | bool found; | |
103 | bool one_only; | |
104 | unsigned short nr_fids; | |
105 | struct afs_file_status *statuses; | |
106 | struct afs_callback *callbacks; | |
107 | struct afs_fid fids[50]; | |
1da177e4 LT |
108 | }; |
109 | ||
1da177e4 LT |
110 | /* |
111 | * check that a directory page is valid | |
112 | */ | |
f3ddee8d DH |
113 | static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
114 | loff_t i_size) | |
1da177e4 | 115 | { |
00317636 | 116 | struct afs_xdr_dir_page *dbuf; |
f3ddee8d | 117 | loff_t latter, off; |
1da177e4 LT |
118 | int tmp, qty; |
119 | ||
dab17c1a DH |
120 | /* Determine how many magic numbers there should be in this page, but |
121 | * we must take care because the directory may change size under us. | |
122 | */ | |
123 | off = page_offset(page); | |
dab17c1a DH |
124 | if (i_size <= off) |
125 | goto checked; | |
126 | ||
127 | latter = i_size - off; | |
1da177e4 LT |
128 | if (latter >= PAGE_SIZE) |
129 | qty = PAGE_SIZE; | |
130 | else | |
131 | qty = latter; | |
00317636 | 132 | qty /= sizeof(union afs_xdr_dir_block); |
1da177e4 LT |
133 | |
134 | /* check them */ | |
63a4681f | 135 | dbuf = kmap(page); |
1da177e4 | 136 | for (tmp = 0; tmp < qty; tmp++) { |
00317636 | 137 | if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { |
dab17c1a | 138 | printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
f3ddee8d | 139 | __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
00317636 | 140 | ntohs(dbuf->blocks[tmp].hdr.magic)); |
f3ddee8d | 141 | trace_afs_dir_check_failed(dvnode, off, i_size); |
63a4681f | 142 | kunmap(page); |
f51375cd | 143 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
144 | goto error; |
145 | } | |
63a4681f DH |
146 | |
147 | /* Make sure each block is NUL terminated so we can reasonably | |
148 | * use string functions on it. The filenames in the page | |
149 | * *should* be NUL-terminated anyway. | |
150 | */ | |
151 | ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; | |
1da177e4 LT |
152 | } |
153 | ||
63a4681f DH |
154 | kunmap(page); |
155 | ||
dab17c1a | 156 | checked: |
f3ddee8d | 157 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 158 | return true; |
1da177e4 | 159 | |
ec26815a | 160 | error: |
be5b82db | 161 | return false; |
ec26815a | 162 | } |
1da177e4 | 163 | |
445b1028 DH |
164 | /* |
165 | * Check the contents of a directory that we've just read. | |
166 | */ | |
167 | static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) | |
168 | { | |
169 | struct afs_xdr_dir_page *dbuf; | |
170 | unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); | |
171 | ||
172 | for (i = 0; i < req->nr_pages; i++) | |
173 | if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) | |
174 | goto bad; | |
175 | return true; | |
176 | ||
177 | bad: | |
178 | pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", | |
179 | dvnode->fid.vid, dvnode->fid.vnode, | |
180 | req->file_size, req->len, req->actual_len, req->remain); | |
181 | pr_warn("DIR %llx %x %x %x\n", | |
182 | req->pos, req->index, req->nr_pages, req->offset); | |
183 | ||
184 | for (i = 0; i < req->nr_pages; i++) { | |
185 | dbuf = kmap(req->pages[i]); | |
186 | for (j = 0; j < qty; j++) { | |
187 | union afs_xdr_dir_block *block = &dbuf->blocks[j]; | |
188 | ||
189 | pr_warn("[%02x] %32phN\n", i * qty + j, block); | |
190 | } | |
191 | kunmap(req->pages[i]); | |
192 | } | |
193 | return false; | |
194 | } | |
195 | ||
1da177e4 LT |
196 | /* |
197 | * open an AFS directory file | |
198 | */ | |
199 | static int afs_dir_open(struct inode *inode, struct file *file) | |
200 | { | |
201 | _enter("{%lu}", inode->i_ino); | |
202 | ||
00317636 DH |
203 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
204 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 205 | |
08e0e7c8 | 206 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
207 | return -ENOENT; |
208 | ||
00d3b7a4 | 209 | return afs_open(inode, file); |
ec26815a | 210 | } |
1da177e4 | 211 | |
f3ddee8d DH |
212 | /* |
213 | * Read the directory into the pagecache in one go, scrubbing the previous | |
214 | * contents. The list of pages is returned, pinning them so that they don't | |
215 | * get reclaimed during the iteration. | |
216 | */ | |
217 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 218 | __acquires(&dvnode->validate_lock) |
f3ddee8d DH |
219 | { |
220 | struct afs_read *req; | |
221 | loff_t i_size; | |
222 | int nr_pages, nr_inline, i, n; | |
223 | int ret = -ENOMEM; | |
224 | ||
225 | retry: | |
226 | i_size = i_size_read(&dvnode->vfs_inode); | |
227 | if (i_size < 2048) | |
f51375cd DH |
228 | return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); |
229 | if (i_size > 2048 * 1024) { | |
230 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
f3ddee8d | 231 | return ERR_PTR(-EFBIG); |
f51375cd | 232 | } |
f3ddee8d DH |
233 | |
234 | _enter("%llu", i_size); | |
235 | ||
236 | /* Get a request record to hold the page list. We want to hold it | |
237 | * inline if we can, but we don't want to make an order 1 allocation. | |
238 | */ | |
239 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; | |
240 | nr_inline = nr_pages; | |
241 | if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) | |
242 | nr_inline = 0; | |
243 | ||
244 | req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, | |
245 | GFP_KERNEL); | |
246 | if (!req) | |
247 | return ERR_PTR(-ENOMEM); | |
248 | ||
249 | refcount_set(&req->usage, 1); | |
250 | req->nr_pages = nr_pages; | |
251 | req->actual_len = i_size; /* May change */ | |
252 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
253 | req->data_version = dvnode->status.data_version; /* May change */ | |
254 | if (nr_inline > 0) { | |
255 | req->pages = req->array; | |
256 | } else { | |
257 | req->pages = kcalloc(nr_pages, sizeof(struct page *), | |
258 | GFP_KERNEL); | |
259 | if (!req->pages) | |
260 | goto error; | |
261 | } | |
262 | ||
263 | /* Get a list of all the pages that hold or will hold the directory | |
264 | * content. We need to fill in any gaps that we might find where the | |
265 | * memory reclaimer has been at work. If there are any gaps, we will | |
266 | * need to reread the entire directory contents. | |
267 | */ | |
268 | i = 0; | |
269 | do { | |
270 | n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, | |
271 | req->nr_pages - i, | |
272 | req->pages + i); | |
273 | _debug("find %u at %u/%u", n, i, req->nr_pages); | |
274 | if (n == 0) { | |
275 | gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; | |
276 | ||
277 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
278 | afs_stat_v(dvnode, n_inval); | |
279 | ||
280 | ret = -ENOMEM; | |
281 | req->pages[i] = __page_cache_alloc(gfp); | |
282 | if (!req->pages[i]) | |
283 | goto error; | |
284 | ret = add_to_page_cache_lru(req->pages[i], | |
285 | dvnode->vfs_inode.i_mapping, | |
286 | i, gfp); | |
287 | if (ret < 0) | |
288 | goto error; | |
289 | ||
290 | set_page_private(req->pages[i], 1); | |
291 | SetPagePrivate(req->pages[i]); | |
292 | unlock_page(req->pages[i]); | |
293 | i++; | |
294 | } else { | |
295 | i += n; | |
296 | } | |
297 | } while (i < req->nr_pages); | |
298 | ||
299 | /* If we're going to reload, we need to lock all the pages to prevent | |
300 | * races. | |
301 | */ | |
b61f7dcf DH |
302 | ret = -ERESTARTSYS; |
303 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
304 | goto error; | |
f3ddee8d | 305 | |
b61f7dcf DH |
306 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
307 | goto success; | |
f3ddee8d | 308 | |
b61f7dcf DH |
309 | up_read(&dvnode->validate_lock); |
310 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
311 | goto error; | |
312 | ||
313 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
99987c56 | 314 | trace_afs_reload_dir(dvnode); |
f3ddee8d DH |
315 | ret = afs_fetch_data(dvnode, key, req); |
316 | if (ret < 0) | |
b61f7dcf | 317 | goto error_unlock; |
f3ddee8d DH |
318 | |
319 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
320 | ||
321 | if (req->len < req->file_size) | |
322 | goto content_has_grown; | |
323 | ||
324 | /* Validate the data we just read. */ | |
325 | ret = -EIO; | |
445b1028 DH |
326 | if (!afs_dir_check_pages(dvnode, req)) |
327 | goto error_unlock; | |
f3ddee8d DH |
328 | |
329 | // TODO: Trim excess pages | |
330 | ||
331 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
332 | } | |
333 | ||
b61f7dcf | 334 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 335 | success: |
f3ddee8d DH |
336 | return req; |
337 | ||
f3ddee8d | 338 | error_unlock: |
b61f7dcf | 339 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
340 | error: |
341 | afs_put_read(req); | |
342 | _leave(" = %d", ret); | |
343 | return ERR_PTR(ret); | |
344 | ||
345 | content_has_grown: | |
b61f7dcf | 346 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
347 | afs_put_read(req); |
348 | goto retry; | |
349 | } | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * deal with one block in an AFS directory | |
353 | */ | |
f51375cd DH |
354 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
355 | struct dir_context *ctx, | |
00317636 | 356 | union afs_xdr_dir_block *block, |
1bbae9f8 | 357 | unsigned blkoff) |
1da177e4 | 358 | { |
00317636 | 359 | union afs_xdr_dirent *dire; |
1da177e4 LT |
360 | unsigned offset, next, curr; |
361 | size_t nlen; | |
1bbae9f8 | 362 | int tmp; |
1da177e4 | 363 | |
1bbae9f8 | 364 | _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
1da177e4 | 365 | |
00317636 | 366 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
367 | |
368 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
369 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
370 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
371 | offset = next |
372 | ) { | |
373 | next = offset + 1; | |
374 | ||
375 | /* skip entries marked unused in the bitmap */ | |
00317636 | 376 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 377 | (1 << (offset % 8)))) { |
5b5e0928 | 378 | _debug("ENT[%zu.%u]: unused", |
00317636 | 379 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
1da177e4 | 380 | if (offset >= curr) |
1bbae9f8 | 381 | ctx->pos = blkoff + |
00317636 | 382 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
383 | continue; |
384 | } | |
385 | ||
386 | /* got a valid entry */ | |
387 | dire = &block->dirents[offset]; | |
388 | nlen = strnlen(dire->u.name, | |
389 | sizeof(*block) - | |
00317636 | 390 | offset * sizeof(union afs_xdr_dirent)); |
1da177e4 | 391 | |
5b5e0928 | 392 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 393 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
394 | (offset < curr ? "skip" : "fill"), |
395 | nlen, dire->u.name); | |
396 | ||
397 | /* work out where the next possible entry is */ | |
00317636 | 398 | for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
4ea219a8 | 399 | if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
5b5e0928 | 400 | _debug("ENT[%zu.%u]:" |
1da177e4 | 401 | " %u travelled beyond end dir block" |
5b5e0928 | 402 | " (len %u/%zu)", |
00317636 | 403 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 404 | offset, next, tmp, nlen); |
f51375cd | 405 | return afs_bad(dvnode, afs_file_error_dir_over_end); |
1da177e4 | 406 | } |
00317636 | 407 | if (!(block->hdr.bitmap[next / 8] & |
1da177e4 | 408 | (1 << (next % 8)))) { |
5b5e0928 AD |
409 | _debug("ENT[%zu.%u]:" |
410 | " %u unmarked extension (len %u/%zu)", | |
00317636 | 411 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 | 412 | offset, next, tmp, nlen); |
f51375cd | 413 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 LT |
414 | } |
415 | ||
5b5e0928 | 416 | _debug("ENT[%zu.%u]: ext %u/%zu", |
00317636 | 417 | blkoff / sizeof(union afs_xdr_dir_block), |
1da177e4 LT |
418 | next, tmp, nlen); |
419 | next++; | |
420 | } | |
421 | ||
422 | /* skip if starts before the current position */ | |
423 | if (offset < curr) | |
424 | continue; | |
425 | ||
426 | /* found the next entry */ | |
1bbae9f8 | 427 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 428 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
429 | (ctx->actor == afs_lookup_filldir || |
430 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 431 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
432 | _leave(" = 0 [full]"); |
433 | return 0; | |
434 | } | |
435 | ||
00317636 | 436 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
437 | } |
438 | ||
439 | _leave(" = 1 [more]"); | |
440 | return 1; | |
ec26815a | 441 | } |
1da177e4 | 442 | |
1da177e4 | 443 | /* |
08e0e7c8 | 444 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 445 | */ |
1bbae9f8 AV |
446 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
447 | struct key *key) | |
1da177e4 | 448 | { |
f3ddee8d | 449 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 DH |
450 | struct afs_xdr_dir_page *dbuf; |
451 | union afs_xdr_dir_block *dblock; | |
f3ddee8d | 452 | struct afs_read *req; |
1da177e4 LT |
453 | struct page *page; |
454 | unsigned blkoff, limit; | |
455 | int ret; | |
456 | ||
1bbae9f8 | 457 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 458 | |
08e0e7c8 | 459 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
460 | _leave(" = -ESTALE"); |
461 | return -ESTALE; | |
462 | } | |
463 | ||
f3ddee8d DH |
464 | req = afs_read_dir(dvnode, key); |
465 | if (IS_ERR(req)) | |
466 | return PTR_ERR(req); | |
467 | ||
1da177e4 | 468 | /* round the file position up to the next entry boundary */ |
00317636 DH |
469 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
470 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
471 | |
472 | /* walk through the blocks in sequence */ | |
473 | ret = 0; | |
f3ddee8d | 474 | while (ctx->pos < req->actual_len) { |
00317636 | 475 | blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
1da177e4 | 476 | |
f3ddee8d DH |
477 | /* Fetch the appropriate page from the directory and re-add it |
478 | * to the LRU. | |
479 | */ | |
480 | page = req->pages[blkoff / PAGE_SIZE]; | |
481 | if (!page) { | |
f51375cd | 482 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
483 | break; |
484 | } | |
f3ddee8d | 485 | mark_page_accessed(page); |
1da177e4 LT |
486 | |
487 | limit = blkoff & ~(PAGE_SIZE - 1); | |
488 | ||
f3ddee8d | 489 | dbuf = kmap(page); |
1da177e4 LT |
490 | |
491 | /* deal with the individual blocks stashed on this page */ | |
492 | do { | |
493 | dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / | |
00317636 | 494 | sizeof(union afs_xdr_dir_block)]; |
f51375cd | 495 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); |
1da177e4 | 496 | if (ret != 1) { |
f3ddee8d | 497 | kunmap(page); |
1da177e4 LT |
498 | goto out; |
499 | } | |
500 | ||
00317636 | 501 | blkoff += sizeof(union afs_xdr_dir_block); |
1da177e4 | 502 | |
1bbae9f8 | 503 | } while (ctx->pos < dir->i_size && blkoff < limit); |
1da177e4 | 504 | |
f3ddee8d | 505 | kunmap(page); |
1da177e4 LT |
506 | ret = 0; |
507 | } | |
508 | ||
ec26815a | 509 | out: |
b61f7dcf | 510 | up_read(&dvnode->validate_lock); |
f3ddee8d | 511 | afs_put_read(req); |
1da177e4 LT |
512 | _leave(" = %d", ret); |
513 | return ret; | |
ec26815a | 514 | } |
1da177e4 | 515 | |
1da177e4 LT |
516 | /* |
517 | * read an AFS directory | |
518 | */ | |
1bbae9f8 | 519 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 520 | { |
215804a9 | 521 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
ec26815a | 522 | } |
1da177e4 | 523 | |
1da177e4 | 524 | /* |
5cf9dd55 | 525 | * Search the directory for a single name |
1da177e4 LT |
526 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
527 | * uniquifier through dtype | |
528 | */ | |
5cf9dd55 DH |
529 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
530 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 531 | { |
5cf9dd55 DH |
532 | struct afs_lookup_one_cookie *cookie = |
533 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 534 | |
1bbae9f8 AV |
535 | _enter("{%s,%u},%s,%u,,%llu,%u", |
536 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 537 | (unsigned long long) ino, dtype); |
1da177e4 | 538 | |
08e0e7c8 | 539 | /* insanity checks first */ |
00317636 DH |
540 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
541 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 542 | |
1bbae9f8 AV |
543 | if (cookie->name.len != nlen || |
544 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
545 | _leave(" = 0 [no]"); |
546 | return 0; | |
547 | } | |
548 | ||
549 | cookie->fid.vnode = ino; | |
550 | cookie->fid.unique = dtype; | |
551 | cookie->found = 1; | |
552 | ||
553 | _leave(" = -1 [found]"); | |
554 | return -1; | |
ec26815a | 555 | } |
1da177e4 | 556 | |
1da177e4 | 557 | /* |
5cf9dd55 | 558 | * Do a lookup of a single name in a directory |
260a9803 | 559 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 560 | */ |
5cf9dd55 DH |
561 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
562 | struct afs_fid *fid, struct key *key) | |
1da177e4 | 563 | { |
1bbae9f8 | 564 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
565 | struct afs_lookup_one_cookie cookie = { |
566 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
567 | .name = dentry->d_name, |
568 | .fid.vid = as->volume->vid | |
569 | }; | |
1da177e4 LT |
570 | int ret; |
571 | ||
a455589f | 572 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 573 | |
1da177e4 | 574 | /* search the directory */ |
1bbae9f8 | 575 | ret = afs_dir_iterate(dir, &cookie.ctx, key); |
1da177e4 | 576 | if (ret < 0) { |
08e0e7c8 DH |
577 | _leave(" = %d [iter]", ret); |
578 | return ret; | |
1da177e4 LT |
579 | } |
580 | ||
581 | ret = -ENOENT; | |
582 | if (!cookie.found) { | |
08e0e7c8 DH |
583 | _leave(" = -ENOENT [not found]"); |
584 | return -ENOENT; | |
1da177e4 LT |
585 | } |
586 | ||
08e0e7c8 | 587 | *fid = cookie.fid; |
3b6492df | 588 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
589 | return 0; |
590 | } | |
591 | ||
5cf9dd55 DH |
592 | /* |
593 | * search the directory for a name | |
594 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
595 | * uniquifier through dtype | |
596 | */ | |
597 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
598 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
599 | { | |
600 | struct afs_lookup_cookie *cookie = | |
601 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
602 | int ret; | |
603 | ||
604 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
605 | cookie->name.name, cookie->name.len, name, nlen, | |
606 | (unsigned long long) ino, dtype); | |
607 | ||
608 | /* insanity checks first */ | |
00317636 DH |
609 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
610 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
611 | |
612 | if (cookie->found) { | |
613 | if (cookie->nr_fids < 50) { | |
614 | cookie->fids[cookie->nr_fids].vnode = ino; | |
615 | cookie->fids[cookie->nr_fids].unique = dtype; | |
616 | cookie->nr_fids++; | |
617 | } | |
618 | } else if (cookie->name.len == nlen && | |
619 | memcmp(cookie->name.name, name, nlen) == 0) { | |
620 | cookie->fids[0].vnode = ino; | |
621 | cookie->fids[0].unique = dtype; | |
622 | cookie->found = 1; | |
623 | if (cookie->one_only) | |
624 | return -1; | |
625 | } | |
626 | ||
627 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
628 | _leave(" = %d", ret); | |
629 | return ret; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
634 | * files in one go and create inodes for them. The inode of the file we were | |
635 | * asked for is returned. | |
636 | */ | |
637 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
638 | struct key *key) | |
639 | { | |
640 | struct afs_lookup_cookie *cookie; | |
641 | struct afs_cb_interest *cbi = NULL; | |
642 | struct afs_super_info *as = dir->i_sb->s_fs_info; | |
643 | struct afs_iget_data data; | |
644 | struct afs_fs_cursor fc; | |
645 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
646 | struct inode *inode = NULL; | |
647 | int ret, i; | |
648 | ||
649 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
650 | ||
651 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
652 | if (!cookie) | |
653 | return ERR_PTR(-ENOMEM); | |
654 | ||
655 | cookie->ctx.actor = afs_lookup_filldir; | |
656 | cookie->name = dentry->d_name; | |
657 | cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ | |
658 | ||
659 | read_seqlock_excl(&dvnode->cb_lock); | |
660 | if (dvnode->cb_interest && | |
661 | dvnode->cb_interest->server && | |
662 | test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) | |
663 | cookie->one_only = true; | |
664 | read_sequnlock_excl(&dvnode->cb_lock); | |
665 | ||
666 | for (i = 0; i < 50; i++) | |
667 | cookie->fids[i].vid = as->volume->vid; | |
668 | ||
669 | /* search the directory */ | |
670 | ret = afs_dir_iterate(dir, &cookie->ctx, key); | |
671 | if (ret < 0) { | |
672 | inode = ERR_PTR(ret); | |
673 | goto out; | |
674 | } | |
675 | ||
676 | inode = ERR_PTR(-ENOENT); | |
677 | if (!cookie->found) | |
678 | goto out; | |
679 | ||
680 | /* Check to see if we already have an inode for the primary fid. */ | |
681 | data.volume = dvnode->volume; | |
682 | data.fid = cookie->fids[0]; | |
683 | inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); | |
684 | if (inode) | |
685 | goto out; | |
686 | ||
687 | /* Need space for examining all the selected files */ | |
688 | inode = ERR_PTR(-ENOMEM); | |
689 | cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), | |
690 | GFP_KERNEL); | |
691 | if (!cookie->statuses) | |
692 | goto out; | |
693 | ||
694 | cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), | |
695 | GFP_KERNEL); | |
696 | if (!cookie->callbacks) | |
697 | goto out_s; | |
698 | ||
699 | /* Try FS.InlineBulkStatus first. Abort codes for the individual | |
700 | * lookups contained therein are stored in the reply without aborting | |
701 | * the whole operation. | |
702 | */ | |
703 | if (cookie->one_only) | |
704 | goto no_inline_bulk_status; | |
705 | ||
706 | inode = ERR_PTR(-ERESTARTSYS); | |
707 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
708 | while (afs_select_fileserver(&fc)) { | |
709 | if (test_bit(AFS_SERVER_FL_NO_IBULK, | |
710 | &fc.cbi->server->flags)) { | |
711 | fc.ac.abort_code = RX_INVALID_OPERATION; | |
712 | fc.ac.error = -ECONNABORTED; | |
713 | break; | |
714 | } | |
715 | afs_fs_inline_bulk_status(&fc, | |
716 | afs_v2net(dvnode), | |
717 | cookie->fids, | |
718 | cookie->statuses, | |
719 | cookie->callbacks, | |
720 | cookie->nr_fids, NULL); | |
721 | } | |
722 | ||
723 | if (fc.ac.error == 0) | |
724 | cbi = afs_get_cb_interest(fc.cbi); | |
725 | if (fc.ac.abort_code == RX_INVALID_OPERATION) | |
726 | set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); | |
727 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
728 | } | |
729 | ||
730 | if (!IS_ERR(inode)) | |
731 | goto success; | |
732 | if (fc.ac.abort_code != RX_INVALID_OPERATION) | |
733 | goto out_c; | |
734 | ||
735 | no_inline_bulk_status: | |
736 | /* We could try FS.BulkStatus next, but this aborts the entire op if | |
737 | * any of the lookups fails - so, for the moment, revert to | |
738 | * FS.FetchStatus for just the primary fid. | |
739 | */ | |
740 | cookie->nr_fids = 1; | |
741 | inode = ERR_PTR(-ERESTARTSYS); | |
742 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
743 | while (afs_select_fileserver(&fc)) { | |
744 | afs_fs_fetch_status(&fc, | |
745 | afs_v2net(dvnode), | |
746 | cookie->fids, | |
747 | cookie->statuses, | |
748 | cookie->callbacks, | |
749 | NULL); | |
750 | } | |
751 | ||
752 | if (fc.ac.error == 0) | |
753 | cbi = afs_get_cb_interest(fc.cbi); | |
754 | inode = ERR_PTR(afs_end_vnode_operation(&fc)); | |
755 | } | |
756 | ||
757 | if (IS_ERR(inode)) | |
758 | goto out_c; | |
759 | ||
760 | for (i = 0; i < cookie->nr_fids; i++) | |
761 | cookie->statuses[i].abort_code = 0; | |
762 | ||
763 | success: | |
764 | /* Turn all the files into inodes and save the first one - which is the | |
765 | * one we actually want. | |
766 | */ | |
767 | if (cookie->statuses[0].abort_code != 0) | |
768 | inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); | |
769 | ||
770 | for (i = 0; i < cookie->nr_fids; i++) { | |
771 | struct inode *ti; | |
772 | ||
773 | if (cookie->statuses[i].abort_code != 0) | |
774 | continue; | |
775 | ||
776 | ti = afs_iget(dir->i_sb, key, &cookie->fids[i], | |
777 | &cookie->statuses[i], | |
778 | &cookie->callbacks[i], | |
779 | cbi); | |
780 | if (i == 0) { | |
781 | inode = ti; | |
782 | } else { | |
783 | if (!IS_ERR(ti)) | |
784 | iput(ti); | |
785 | } | |
786 | } | |
787 | ||
788 | out_c: | |
789 | afs_put_cb_interest(afs_v2net(dvnode), cbi); | |
790 | kfree(cookie->callbacks); | |
791 | out_s: | |
792 | kfree(cookie->statuses); | |
793 | out: | |
794 | kfree(cookie); | |
795 | return inode; | |
796 | } | |
797 | ||
6f8880d8 DH |
798 | /* |
799 | * Look up an entry in a directory with @sys substitution. | |
800 | */ | |
801 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
802 | struct key *key) | |
803 | { | |
804 | struct afs_sysnames *subs; | |
805 | struct afs_net *net = afs_i2net(dir); | |
806 | struct dentry *ret; | |
807 | char *buf, *p, *name; | |
808 | int len, i; | |
809 | ||
810 | _enter(""); | |
811 | ||
812 | ret = ERR_PTR(-ENOMEM); | |
813 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
814 | if (!buf) | |
815 | goto out_p; | |
816 | if (dentry->d_name.len > 4) { | |
817 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
818 | p += dentry->d_name.len - 4; | |
819 | } | |
820 | ||
821 | /* There is an ordered list of substitutes that we have to try. */ | |
822 | read_lock(&net->sysnames_lock); | |
823 | subs = net->sysnames; | |
824 | refcount_inc(&subs->usage); | |
825 | read_unlock(&net->sysnames_lock); | |
826 | ||
827 | for (i = 0; i < subs->nr; i++) { | |
828 | name = subs->subs[i]; | |
829 | len = dentry->d_name.len - 4 + strlen(name); | |
830 | if (len >= AFSNAMEMAX) { | |
831 | ret = ERR_PTR(-ENAMETOOLONG); | |
832 | goto out_s; | |
833 | } | |
834 | ||
835 | strcpy(p, name); | |
836 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
837 | if (IS_ERR(ret) || d_is_positive(ret)) | |
838 | goto out_s; | |
839 | dput(ret); | |
840 | } | |
841 | ||
842 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
843 | * the cached dentry to hide changes to the sysnames list. | |
844 | */ | |
845 | ret = NULL; | |
846 | out_s: | |
847 | afs_put_sysnames(subs); | |
848 | kfree(buf); | |
849 | out_p: | |
850 | key_put(key); | |
851 | return ret; | |
852 | } | |
853 | ||
08e0e7c8 DH |
854 | /* |
855 | * look up an entry in a directory | |
856 | */ | |
260a9803 | 857 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 858 | unsigned int flags) |
08e0e7c8 | 859 | { |
5cf9dd55 | 860 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
08e0e7c8 | 861 | struct inode *inode; |
34b2a88f | 862 | struct dentry *d; |
00d3b7a4 | 863 | struct key *key; |
08e0e7c8 DH |
864 | int ret; |
865 | ||
3b6492df | 866 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 867 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 868 | |
2b0143b5 | 869 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 870 | |
45222b9e | 871 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
872 | _leave(" = -ENAMETOOLONG"); |
873 | return ERR_PTR(-ENAMETOOLONG); | |
874 | } | |
875 | ||
5cf9dd55 | 876 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
877 | _leave(" = -ESTALE"); |
878 | return ERR_PTR(-ESTALE); | |
879 | } | |
880 | ||
5cf9dd55 | 881 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
882 | if (IS_ERR(key)) { |
883 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 884 | return ERR_CAST(key); |
00d3b7a4 DH |
885 | } |
886 | ||
5cf9dd55 | 887 | ret = afs_validate(dvnode, key); |
260a9803 DH |
888 | if (ret < 0) { |
889 | key_put(key); | |
890 | _leave(" = %d [val]", ret); | |
891 | return ERR_PTR(ret); | |
892 | } | |
893 | ||
6f8880d8 DH |
894 | if (dentry->d_name.len >= 4 && |
895 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
896 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
897 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
898 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
899 | return afs_lookup_atsys(dir, dentry, key); | |
900 | ||
d55b4da4 | 901 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 902 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 903 | key_put(key); |
34b2a88f AV |
904 | if (inode == ERR_PTR(-ENOENT)) { |
905 | inode = afs_try_auto_mntpt(dentry, dir); | |
34b2a88f AV |
906 | } else { |
907 | dentry->d_fsdata = | |
908 | (void *)(unsigned long)dvnode->status.data_version; | |
08e0e7c8 | 909 | } |
34b2a88f AV |
910 | d = d_splice_alias(inode, dentry); |
911 | if (!IS_ERR_OR_NULL(d)) | |
912 | d->d_fsdata = dentry->d_fsdata; | |
913 | return d; | |
ec26815a | 914 | } |
1da177e4 | 915 | |
1da177e4 LT |
916 | /* |
917 | * check that a dentry lookup hit has found a valid entry | |
918 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
919 | * inode | |
1da177e4 | 920 | */ |
0b728e19 | 921 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 922 | { |
260a9803 | 923 | struct afs_vnode *vnode, *dir; |
dd0d9a46 | 924 | struct afs_fid uninitialized_var(fid); |
1da177e4 | 925 | struct dentry *parent; |
c435ee34 | 926 | struct inode *inode; |
00d3b7a4 | 927 | struct key *key; |
a4ff7401 | 928 | long dir_version, de_version; |
1da177e4 LT |
929 | int ret; |
930 | ||
0b728e19 | 931 | if (flags & LOOKUP_RCU) |
34286d66 NP |
932 | return -ECHILD; |
933 | ||
c435ee34 DH |
934 | if (d_really_is_positive(dentry)) { |
935 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 936 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 937 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 938 | vnode->flags); |
c435ee34 | 939 | } else { |
a455589f | 940 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 941 | } |
1da177e4 | 942 | |
260a9803 | 943 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
944 | if (IS_ERR(key)) |
945 | key = NULL; | |
946 | ||
c435ee34 DH |
947 | if (d_really_is_positive(dentry)) { |
948 | inode = d_inode(dentry); | |
949 | if (inode) { | |
950 | vnode = AFS_FS_I(inode); | |
951 | afs_validate(vnode, key); | |
952 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
953 | goto out_bad; | |
954 | } | |
955 | } | |
956 | ||
1da177e4 | 957 | /* lock down the parent dentry so we can peer at it */ |
08e0e7c8 | 958 | parent = dget_parent(dentry); |
2b0143b5 | 959 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 960 | |
260a9803 | 961 | /* validate the parent directory */ |
c435ee34 | 962 | afs_validate(dir, key); |
260a9803 DH |
963 | |
964 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 965 | _debug("%pd: parent dir deleted", dentry); |
c435ee34 | 966 | goto out_bad_parent; |
1da177e4 LT |
967 | } |
968 | ||
a4ff7401 DH |
969 | /* We only need to invalidate a dentry if the server's copy changed |
970 | * behind our back. If we made the change, it's no problem. Note that | |
971 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
972 | * version. | |
973 | */ | |
974 | dir_version = (long)dir->status.data_version; | |
975 | de_version = (long)dentry->d_fsdata; | |
976 | if (de_version == dir_version) | |
977 | goto out_valid; | |
978 | ||
979 | dir_version = (long)dir->invalid_before; | |
980 | if (de_version - dir_version >= 0) | |
981 | goto out_valid; | |
1da177e4 | 982 | |
260a9803 | 983 | _debug("dir modified"); |
d55b4da4 | 984 | afs_stat_v(dir, n_reval); |
260a9803 DH |
985 | |
986 | /* search the directory for this vnode */ | |
5cf9dd55 | 987 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
260a9803 DH |
988 | switch (ret) { |
989 | case 0: | |
990 | /* the filename maps to something */ | |
2b0143b5 | 991 | if (d_really_is_negative(dentry)) |
c435ee34 DH |
992 | goto out_bad_parent; |
993 | inode = d_inode(dentry); | |
994 | if (is_bad_inode(inode)) { | |
a455589f AV |
995 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
996 | dentry); | |
c435ee34 | 997 | goto out_bad_parent; |
1da177e4 LT |
998 | } |
999 | ||
c435ee34 DH |
1000 | vnode = AFS_FS_I(inode); |
1001 | ||
1da177e4 LT |
1002 | /* if the vnode ID has changed, then the dirent points to a |
1003 | * different file */ | |
08e0e7c8 | 1004 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 1005 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 1006 | dentry, fid.vnode, |
08e0e7c8 | 1007 | vnode->fid.vnode); |
1da177e4 LT |
1008 | goto not_found; |
1009 | } | |
1010 | ||
1011 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1012 | * been deleted and replaced, and the original vnode ID has |
1013 | * been reused */ | |
08e0e7c8 | 1014 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1015 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1016 | dentry, fid.unique, | |
7a224228 | 1017 | vnode->fid.unique, |
c435ee34 DH |
1018 | vnode->vfs_inode.i_generation); |
1019 | write_seqlock(&vnode->cb_lock); | |
08e0e7c8 | 1020 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
c435ee34 | 1021 | write_sequnlock(&vnode->cb_lock); |
260a9803 | 1022 | goto not_found; |
1da177e4 | 1023 | } |
260a9803 | 1024 | goto out_valid; |
08e0e7c8 | 1025 | |
260a9803 DH |
1026 | case -ENOENT: |
1027 | /* the filename is unknown */ | |
a455589f | 1028 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1029 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1030 | goto not_found; |
1031 | goto out_valid; | |
1da177e4 | 1032 | |
260a9803 | 1033 | default: |
a455589f AV |
1034 | _debug("failed to iterate dir %pd: %d", |
1035 | parent, ret); | |
c435ee34 | 1036 | goto out_bad_parent; |
08e0e7c8 DH |
1037 | } |
1038 | ||
ec26815a | 1039 | out_valid: |
a4ff7401 | 1040 | dentry->d_fsdata = (void *)dir_version; |
1da177e4 | 1041 | dput(parent); |
00d3b7a4 | 1042 | key_put(key); |
1da177e4 LT |
1043 | _leave(" = 1 [valid]"); |
1044 | return 1; | |
1045 | ||
1046 | /* the dirent, if it exists, now points to a different vnode */ | |
ec26815a | 1047 | not_found: |
1da177e4 LT |
1048 | spin_lock(&dentry->d_lock); |
1049 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; | |
1050 | spin_unlock(&dentry->d_lock); | |
1051 | ||
c435ee34 | 1052 | out_bad_parent: |
a455589f | 1053 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1054 | dput(parent); |
c435ee34 | 1055 | out_bad: |
00d3b7a4 | 1056 | key_put(key); |
1da177e4 LT |
1057 | |
1058 | _leave(" = 0 [bad]"); | |
1059 | return 0; | |
ec26815a | 1060 | } |
1da177e4 | 1061 | |
1da177e4 LT |
1062 | /* |
1063 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1064 | * sleep) | |
1065 | * - called from dput() when d_count is going to 0. | |
1066 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1067 | */ | |
fe15ce44 | 1068 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1069 | { |
a455589f | 1070 | _enter("%pd", dentry); |
1da177e4 LT |
1071 | |
1072 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1073 | goto zap; | |
1074 | ||
2b0143b5 DH |
1075 | if (d_really_is_positive(dentry) && |
1076 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1077 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1078 | goto zap; |
1da177e4 LT |
1079 | |
1080 | _leave(" = 0 [keep]"); | |
1081 | return 0; | |
1082 | ||
ec26815a | 1083 | zap: |
1da177e4 LT |
1084 | _leave(" = 1 [zap]"); |
1085 | return 1; | |
ec26815a | 1086 | } |
260a9803 | 1087 | |
79ddbfa5 DH |
1088 | /* |
1089 | * Clean up sillyrename files on dentry removal. | |
1090 | */ | |
1091 | static void afs_d_iput(struct dentry *dentry, struct inode *inode) | |
1092 | { | |
1093 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1094 | afs_silly_iput(dentry, inode); | |
1095 | iput(inode); | |
1096 | } | |
1097 | ||
260a9803 DH |
1098 | /* |
1099 | * handle dentry release | |
1100 | */ | |
66c7e1d3 | 1101 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1102 | { |
a455589f | 1103 | _enter("%pd", dentry); |
260a9803 DH |
1104 | } |
1105 | ||
d2ddc776 DH |
1106 | /* |
1107 | * Create a new inode for create/mkdir/symlink | |
1108 | */ | |
1109 | static void afs_vnode_new_inode(struct afs_fs_cursor *fc, | |
1110 | struct dentry *new_dentry, | |
1111 | struct afs_fid *newfid, | |
1112 | struct afs_file_status *newstatus, | |
1113 | struct afs_callback *newcb) | |
1114 | { | |
5a813276 | 1115 | struct afs_vnode *vnode; |
d2ddc776 DH |
1116 | struct inode *inode; |
1117 | ||
1118 | if (fc->ac.error < 0) | |
1119 | return; | |
1120 | ||
1121 | inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, | |
1122 | newfid, newstatus, newcb, fc->cbi); | |
1123 | if (IS_ERR(inode)) { | |
1124 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1125 | * the new directory on the server. | |
1126 | */ | |
1127 | fc->ac.error = PTR_ERR(inode); | |
1128 | return; | |
1129 | } | |
1130 | ||
5a813276 DH |
1131 | vnode = AFS_FS_I(inode); |
1132 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
00671912 | 1133 | afs_vnode_commit_status(fc, vnode, 0); |
73116df7 | 1134 | d_instantiate(new_dentry, inode); |
d2ddc776 DH |
1135 | } |
1136 | ||
260a9803 DH |
1137 | /* |
1138 | * create a directory on an AFS filesystem | |
1139 | */ | |
18bb1db3 | 1140 | static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a9803 | 1141 | { |
d2ddc776 DH |
1142 | struct afs_file_status newstatus; |
1143 | struct afs_fs_cursor fc; | |
1144 | struct afs_callback newcb; | |
1145 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1146 | struct afs_fid newfid; | |
260a9803 | 1147 | struct key *key; |
63a4681f | 1148 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1149 | int ret; |
1150 | ||
d2ddc776 | 1151 | mode |= S_IFDIR; |
260a9803 | 1152 | |
3b6492df | 1153 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1154 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1155 | |
260a9803 DH |
1156 | key = afs_request_key(dvnode->volume->cell); |
1157 | if (IS_ERR(key)) { | |
1158 | ret = PTR_ERR(key); | |
1159 | goto error; | |
1160 | } | |
1161 | ||
d2ddc776 DH |
1162 | ret = -ERESTARTSYS; |
1163 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1164 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1165 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1166 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1167 | &newfid, &newstatus, &newcb); |
1168 | } | |
260a9803 | 1169 | |
d2ddc776 DH |
1170 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1171 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1172 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1173 | ret = afs_end_vnode_operation(&fc); | |
1174 | if (ret < 0) | |
1175 | goto error_key; | |
4433b691 DH |
1176 | } else { |
1177 | goto error_key; | |
260a9803 DH |
1178 | } |
1179 | ||
63a4681f DH |
1180 | if (ret == 0 && |
1181 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1182 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1183 | afs_edit_dir_for_create); | |
1184 | ||
260a9803 DH |
1185 | key_put(key); |
1186 | _leave(" = 0"); | |
1187 | return 0; | |
1188 | ||
d2ddc776 | 1189 | error_key: |
260a9803 DH |
1190 | key_put(key); |
1191 | error: | |
1192 | d_drop(dentry); | |
1193 | _leave(" = %d", ret); | |
1194 | return ret; | |
1195 | } | |
1196 | ||
d2ddc776 DH |
1197 | /* |
1198 | * Remove a subdir from a directory. | |
1199 | */ | |
1200 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1201 | { | |
1202 | if (d_really_is_positive(dentry)) { | |
1203 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1204 | ||
1205 | clear_nlink(&vnode->vfs_inode); | |
1206 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1207 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1208 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1209 | } |
1210 | } | |
1211 | ||
260a9803 DH |
1212 | /* |
1213 | * remove a directory from an AFS filesystem | |
1214 | */ | |
1215 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1216 | { | |
d2ddc776 | 1217 | struct afs_fs_cursor fc; |
f58db83f | 1218 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 | 1219 | struct key *key; |
63a4681f | 1220 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1221 | int ret; |
1222 | ||
3b6492df | 1223 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1224 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1225 | |
260a9803 DH |
1226 | key = afs_request_key(dvnode->volume->cell); |
1227 | if (IS_ERR(key)) { | |
1228 | ret = PTR_ERR(key); | |
1229 | goto error; | |
1230 | } | |
1231 | ||
f58db83f DH |
1232 | /* Try to make sure we have a callback promise on the victim. */ |
1233 | if (d_really_is_positive(dentry)) { | |
1234 | vnode = AFS_FS_I(d_inode(dentry)); | |
1235 | ret = afs_validate(vnode, key); | |
1236 | if (ret < 0) | |
1237 | goto error_key; | |
1238 | } | |
1239 | ||
79ddbfa5 DH |
1240 | if (vnode) { |
1241 | ret = down_write_killable(&vnode->rmdir_lock); | |
1242 | if (ret < 0) | |
1243 | goto error_key; | |
1244 | } | |
1245 | ||
d2ddc776 DH |
1246 | ret = -ERESTARTSYS; |
1247 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1248 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1249 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
30062bd1 | 1250 | afs_fs_remove(&fc, vnode, dentry->d_name.name, true, |
63a4681f | 1251 | data_version); |
d2ddc776 | 1252 | } |
260a9803 | 1253 | |
d2ddc776 DH |
1254 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1255 | ret = afs_end_vnode_operation(&fc); | |
63a4681f | 1256 | if (ret == 0) { |
d2ddc776 | 1257 | afs_dir_remove_subdir(dentry); |
63a4681f DH |
1258 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1259 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1260 | afs_edit_dir_for_rmdir); | |
1261 | } | |
260a9803 DH |
1262 | } |
1263 | ||
79ddbfa5 DH |
1264 | if (vnode) |
1265 | up_write(&vnode->rmdir_lock); | |
f58db83f | 1266 | error_key: |
260a9803 | 1267 | key_put(key); |
260a9803 | 1268 | error: |
260a9803 DH |
1269 | return ret; |
1270 | } | |
1271 | ||
1272 | /* | |
d2ddc776 DH |
1273 | * Remove a link to a file or symlink from a directory. |
1274 | * | |
1275 | * If the file was not deleted due to excess hard links, the fileserver will | |
1276 | * break the callback promise on the file - if it had one - before it returns | |
1277 | * to us, and if it was deleted, it won't | |
1278 | * | |
1279 | * However, if we didn't have a callback promise outstanding, or it was | |
1280 | * outstanding on a different server, then it won't break it either... | |
1281 | */ | |
79ddbfa5 DH |
1282 | int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
1283 | unsigned long d_version_before, | |
1284 | unsigned long d_version_after) | |
d2ddc776 | 1285 | { |
440fbc3a | 1286 | bool dir_valid; |
d2ddc776 DH |
1287 | int ret = 0; |
1288 | ||
440fbc3a DH |
1289 | /* There were no intervening changes on the server if the version |
1290 | * number we got back was incremented by exactly 1. | |
1291 | */ | |
1292 | dir_valid = (d_version_after == d_version_before + 1); | |
1293 | ||
d2ddc776 DH |
1294 | if (d_really_is_positive(dentry)) { |
1295 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1296 | ||
30062bd1 DH |
1297 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1298 | /* Already done */ | |
1299 | } else if (dir_valid) { | |
440fbc3a DH |
1300 | drop_nlink(&vnode->vfs_inode); |
1301 | if (vnode->vfs_inode.i_nlink == 0) { | |
1302 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1303 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1304 | } | |
d2ddc776 | 1305 | ret = 0; |
440fbc3a DH |
1306 | } else { |
1307 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
1308 | ||
1309 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
1310 | kdebug("AFS_VNODE_DELETED"); | |
1311 | ||
1312 | ret = afs_validate(vnode, key); | |
1313 | if (ret == -ESTALE) | |
1314 | ret = 0; | |
1315 | } | |
d2ddc776 DH |
1316 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
1317 | } | |
1318 | ||
1319 | return ret; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1324 | */ |
1325 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1326 | { | |
d2ddc776 | 1327 | struct afs_fs_cursor fc; |
30062bd1 | 1328 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 | 1329 | struct key *key; |
440fbc3a | 1330 | unsigned long d_version = (unsigned long)dentry->d_fsdata; |
79ddbfa5 | 1331 | bool need_rehash = false; |
63a4681f | 1332 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1333 | int ret; |
1334 | ||
3b6492df | 1335 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1336 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1337 | |
45222b9e | 1338 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1339 | return -ENAMETOOLONG; |
260a9803 DH |
1340 | |
1341 | key = afs_request_key(dvnode->volume->cell); | |
1342 | if (IS_ERR(key)) { | |
1343 | ret = PTR_ERR(key); | |
1344 | goto error; | |
1345 | } | |
1346 | ||
d2ddc776 | 1347 | /* Try to make sure we have a callback promise on the victim. */ |
2b0143b5 DH |
1348 | if (d_really_is_positive(dentry)) { |
1349 | vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1350 | ret = afs_validate(vnode, key); |
1351 | if (ret < 0) | |
d2ddc776 | 1352 | goto error_key; |
260a9803 DH |
1353 | } |
1354 | ||
79ddbfa5 DH |
1355 | spin_lock(&dentry->d_lock); |
1356 | if (vnode && d_count(dentry) > 1) { | |
1357 | spin_unlock(&dentry->d_lock); | |
1358 | /* Start asynchronous writeout of the inode */ | |
1359 | write_inode_now(d_inode(dentry), 0); | |
1360 | ret = afs_sillyrename(dvnode, vnode, dentry, key); | |
1361 | goto error_key; | |
1362 | } | |
1363 | if (!d_unhashed(dentry)) { | |
1364 | /* Prevent a race with RCU lookup. */ | |
1365 | __d_drop(dentry); | |
1366 | need_rehash = true; | |
1367 | } | |
1368 | spin_unlock(&dentry->d_lock); | |
1369 | ||
d2ddc776 DH |
1370 | ret = -ERESTARTSYS; |
1371 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1372 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1373 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
30062bd1 DH |
1374 | |
1375 | if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && | |
1376 | !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { | |
1377 | yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, | |
1378 | data_version); | |
1379 | if (fc.ac.error != -ECONNABORTED || | |
1380 | fc.ac.abort_code != RXGEN_OPCODE) | |
1381 | continue; | |
1382 | set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); | |
1383 | } | |
1384 | ||
1385 | afs_fs_remove(&fc, vnode, dentry->d_name.name, false, | |
63a4681f | 1386 | data_version); |
d2ddc776 | 1387 | } |
260a9803 | 1388 | |
d2ddc776 DH |
1389 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
1390 | ret = afs_end_vnode_operation(&fc); | |
1391 | if (ret == 0) | |
440fbc3a DH |
1392 | ret = afs_dir_remove_link( |
1393 | dentry, key, d_version, | |
1394 | (unsigned long)dvnode->status.data_version); | |
63a4681f DH |
1395 | if (ret == 0 && |
1396 | test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1397 | afs_edit_dir_remove(dvnode, &dentry->d_name, | |
1398 | afs_edit_dir_for_unlink); | |
260a9803 DH |
1399 | } |
1400 | ||
79ddbfa5 DH |
1401 | if (need_rehash && ret < 0 && ret != -ENOENT) |
1402 | d_rehash(dentry); | |
1403 | ||
d2ddc776 | 1404 | error_key: |
260a9803 DH |
1405 | key_put(key); |
1406 | error: | |
1407 | _leave(" = %d", ret); | |
1408 | return ret; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * create a regular file on an AFS filesystem | |
1413 | */ | |
4acdaf27 | 1414 | static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 1415 | bool excl) |
260a9803 | 1416 | { |
d2ddc776 DH |
1417 | struct afs_fs_cursor fc; |
1418 | struct afs_file_status newstatus; | |
1419 | struct afs_callback newcb; | |
43dd388b | 1420 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
d2ddc776 | 1421 | struct afs_fid newfid; |
260a9803 | 1422 | struct key *key; |
63a4681f | 1423 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1424 | int ret; |
1425 | ||
d2ddc776 | 1426 | mode |= S_IFREG; |
260a9803 | 1427 | |
3b6492df | 1428 | _enter("{%llx:%llu},{%pd},%ho,", |
a455589f | 1429 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1430 | |
d2ddc776 DH |
1431 | ret = -ENAMETOOLONG; |
1432 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1433 | goto error; | |
1434 | ||
260a9803 DH |
1435 | key = afs_request_key(dvnode->volume->cell); |
1436 | if (IS_ERR(key)) { | |
1437 | ret = PTR_ERR(key); | |
1438 | goto error; | |
1439 | } | |
1440 | ||
d2ddc776 DH |
1441 | ret = -ERESTARTSYS; |
1442 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1443 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1444 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f | 1445 | afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
d2ddc776 DH |
1446 | &newfid, &newstatus, &newcb); |
1447 | } | |
260a9803 | 1448 | |
d2ddc776 DH |
1449 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1450 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1451 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); | |
1452 | ret = afs_end_vnode_operation(&fc); | |
1453 | if (ret < 0) | |
1454 | goto error_key; | |
4433b691 DH |
1455 | } else { |
1456 | goto error_key; | |
260a9803 DH |
1457 | } |
1458 | ||
63a4681f DH |
1459 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1460 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1461 | afs_edit_dir_for_create); | |
1462 | ||
260a9803 DH |
1463 | key_put(key); |
1464 | _leave(" = 0"); | |
1465 | return 0; | |
1466 | ||
d2ddc776 | 1467 | error_key: |
260a9803 DH |
1468 | key_put(key); |
1469 | error: | |
1470 | d_drop(dentry); | |
1471 | _leave(" = %d", ret); | |
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * create a hard link between files in an AFS filesystem | |
1477 | */ | |
1478 | static int afs_link(struct dentry *from, struct inode *dir, | |
1479 | struct dentry *dentry) | |
1480 | { | |
d2ddc776 | 1481 | struct afs_fs_cursor fc; |
260a9803 DH |
1482 | struct afs_vnode *dvnode, *vnode; |
1483 | struct key *key; | |
63a4681f | 1484 | u64 data_version; |
260a9803 DH |
1485 | int ret; |
1486 | ||
2b0143b5 | 1487 | vnode = AFS_FS_I(d_inode(from)); |
260a9803 | 1488 | dvnode = AFS_FS_I(dir); |
63a4681f | 1489 | data_version = dvnode->status.data_version; |
260a9803 | 1490 | |
3b6492df | 1491 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1492 | vnode->fid.vid, vnode->fid.vnode, |
1493 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1494 | dentry); |
260a9803 | 1495 | |
d2ddc776 DH |
1496 | ret = -ENAMETOOLONG; |
1497 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1498 | goto error; | |
1499 | ||
260a9803 DH |
1500 | key = afs_request_key(dvnode->volume->cell); |
1501 | if (IS_ERR(key)) { | |
1502 | ret = PTR_ERR(key); | |
1503 | goto error; | |
1504 | } | |
1505 | ||
d2ddc776 DH |
1506 | ret = -ERESTARTSYS; |
1507 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1508 | if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { | |
1509 | afs_end_vnode_operation(&fc); | |
bc1527dc | 1510 | goto error_key; |
d2ddc776 DH |
1511 | } |
1512 | ||
1513 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1514 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
1515 | fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); | |
63a4681f | 1516 | afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); |
d2ddc776 DH |
1517 | } |
1518 | ||
1519 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1520 | afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); | |
1521 | ihold(&vnode->vfs_inode); | |
1522 | d_instantiate(dentry, &vnode->vfs_inode); | |
1523 | ||
1524 | mutex_unlock(&vnode->io_lock); | |
1525 | ret = afs_end_vnode_operation(&fc); | |
1526 | if (ret < 0) | |
1527 | goto error_key; | |
4433b691 DH |
1528 | } else { |
1529 | goto error_key; | |
d2ddc776 | 1530 | } |
260a9803 | 1531 | |
63a4681f DH |
1532 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1533 | afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, | |
1534 | afs_edit_dir_for_link); | |
1535 | ||
260a9803 DH |
1536 | key_put(key); |
1537 | _leave(" = 0"); | |
1538 | return 0; | |
1539 | ||
d2ddc776 | 1540 | error_key: |
260a9803 DH |
1541 | key_put(key); |
1542 | error: | |
1543 | d_drop(dentry); | |
1544 | _leave(" = %d", ret); | |
1545 | return ret; | |
1546 | } | |
1547 | ||
1548 | /* | |
1549 | * create a symlink in an AFS filesystem | |
1550 | */ | |
1551 | static int afs_symlink(struct inode *dir, struct dentry *dentry, | |
1552 | const char *content) | |
1553 | { | |
d2ddc776 DH |
1554 | struct afs_fs_cursor fc; |
1555 | struct afs_file_status newstatus; | |
1556 | struct afs_vnode *dvnode = AFS_FS_I(dir); | |
1557 | struct afs_fid newfid; | |
260a9803 | 1558 | struct key *key; |
63a4681f | 1559 | u64 data_version = dvnode->status.data_version; |
260a9803 DH |
1560 | int ret; |
1561 | ||
3b6492df | 1562 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1563 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1564 | content); |
1565 | ||
d2ddc776 DH |
1566 | ret = -ENAMETOOLONG; |
1567 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1568 | goto error; | |
1569 | ||
260a9803 | 1570 | ret = -EINVAL; |
45222b9e | 1571 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1572 | goto error; |
1573 | ||
1574 | key = afs_request_key(dvnode->volume->cell); | |
1575 | if (IS_ERR(key)) { | |
1576 | ret = PTR_ERR(key); | |
1577 | goto error; | |
1578 | } | |
1579 | ||
d2ddc776 DH |
1580 | ret = -ERESTARTSYS; |
1581 | if (afs_begin_vnode_operation(&fc, dvnode, key)) { | |
1582 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 1583 | fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
63a4681f DH |
1584 | afs_fs_symlink(&fc, dentry->d_name.name, |
1585 | content, data_version, | |
d2ddc776 DH |
1586 | &newfid, &newstatus); |
1587 | } | |
260a9803 | 1588 | |
d2ddc776 DH |
1589 | afs_check_for_remote_deletion(&fc, fc.vnode); |
1590 | afs_vnode_commit_status(&fc, dvnode, fc.cb_break); | |
1591 | afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); | |
1592 | ret = afs_end_vnode_operation(&fc); | |
1593 | if (ret < 0) | |
1594 | goto error_key; | |
4433b691 DH |
1595 | } else { |
1596 | goto error_key; | |
260a9803 DH |
1597 | } |
1598 | ||
63a4681f DH |
1599 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
1600 | afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, | |
1601 | afs_edit_dir_for_symlink); | |
1602 | ||
260a9803 DH |
1603 | key_put(key); |
1604 | _leave(" = 0"); | |
1605 | return 0; | |
1606 | ||
d2ddc776 | 1607 | error_key: |
260a9803 DH |
1608 | key_put(key); |
1609 | error: | |
1610 | d_drop(dentry); | |
1611 | _leave(" = %d", ret); | |
1612 | return ret; | |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * rename a file in an AFS filesystem and/or move it between directories | |
1617 | */ | |
1618 | static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1619 | struct inode *new_dir, struct dentry *new_dentry, |
1620 | unsigned int flags) | |
260a9803 | 1621 | { |
d2ddc776 | 1622 | struct afs_fs_cursor fc; |
260a9803 | 1623 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
79ddbfa5 DH |
1624 | struct dentry *tmp = NULL, *rehash = NULL; |
1625 | struct inode *new_inode; | |
260a9803 | 1626 | struct key *key; |
63a4681f DH |
1627 | u64 orig_data_version, new_data_version; |
1628 | bool new_negative = d_is_negative(new_dentry); | |
260a9803 DH |
1629 | int ret; |
1630 | ||
1cd66c93 MS |
1631 | if (flags) |
1632 | return -EINVAL; | |
1633 | ||
79ddbfa5 DH |
1634 | /* Don't allow silly-rename files be moved around. */ |
1635 | if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1636 | return -EINVAL; | |
1637 | ||
2b0143b5 | 1638 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1639 | orig_dvnode = AFS_FS_I(old_dir); |
1640 | new_dvnode = AFS_FS_I(new_dir); | |
63a4681f DH |
1641 | orig_data_version = orig_dvnode->status.data_version; |
1642 | new_data_version = new_dvnode->status.data_version; | |
260a9803 | 1643 | |
3b6492df | 1644 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1645 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1646 | vnode->fid.vid, vnode->fid.vnode, | |
1647 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1648 | new_dentry); |
260a9803 | 1649 | |
260a9803 DH |
1650 | key = afs_request_key(orig_dvnode->volume->cell); |
1651 | if (IS_ERR(key)) { | |
1652 | ret = PTR_ERR(key); | |
1653 | goto error; | |
1654 | } | |
1655 | ||
79ddbfa5 DH |
1656 | /* For non-directories, check whether the target is busy and if so, |
1657 | * make a copy of the dentry and then do a silly-rename. If the | |
1658 | * silly-rename succeeds, the copied dentry is hashed and becomes the | |
1659 | * new target. | |
1660 | */ | |
1661 | if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { | |
1662 | /* To prevent any new references to the target during the | |
1663 | * rename, we unhash the dentry in advance. | |
1664 | */ | |
1665 | if (!d_unhashed(new_dentry)) { | |
1666 | d_drop(new_dentry); | |
1667 | rehash = new_dentry; | |
1668 | } | |
1669 | ||
1670 | if (d_count(new_dentry) > 2) { | |
1671 | /* copy the target dentry's name */ | |
1672 | ret = -ENOMEM; | |
1673 | tmp = d_alloc(new_dentry->d_parent, | |
1674 | &new_dentry->d_name); | |
1675 | if (!tmp) | |
1676 | goto error_rehash; | |
1677 | ||
1678 | ret = afs_sillyrename(new_dvnode, | |
1679 | AFS_FS_I(d_inode(new_dentry)), | |
1680 | new_dentry, key); | |
1681 | if (ret) | |
1682 | goto error_rehash; | |
1683 | ||
1684 | new_dentry = tmp; | |
1685 | rehash = NULL; | |
1686 | new_negative = true; | |
1687 | orig_data_version = orig_dvnode->status.data_version; | |
1688 | new_data_version = new_dvnode->status.data_version; | |
1689 | } | |
1690 | } | |
1691 | ||
d2ddc776 DH |
1692 | ret = -ERESTARTSYS; |
1693 | if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { | |
1694 | if (orig_dvnode != new_dvnode) { | |
1695 | if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { | |
1696 | afs_end_vnode_operation(&fc); | |
79ddbfa5 | 1697 | goto error_rehash; |
d2ddc776 DH |
1698 | } |
1699 | } | |
1700 | while (afs_select_fileserver(&fc)) { | |
68251f0a DH |
1701 | fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); |
1702 | fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); | |
d2ddc776 | 1703 | afs_fs_rename(&fc, old_dentry->d_name.name, |
63a4681f DH |
1704 | new_dvnode, new_dentry->d_name.name, |
1705 | orig_data_version, new_data_version); | |
d2ddc776 DH |
1706 | } |
1707 | ||
1708 | afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); | |
1709 | afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); | |
1710 | if (orig_dvnode != new_dvnode) | |
1711 | mutex_unlock(&new_dvnode->io_lock); | |
1712 | ret = afs_end_vnode_operation(&fc); | |
1713 | if (ret < 0) | |
79ddbfa5 | 1714 | goto error_rehash; |
d2ddc776 DH |
1715 | } |
1716 | ||
63a4681f | 1717 | if (ret == 0) { |
79ddbfa5 DH |
1718 | if (rehash) |
1719 | d_rehash(rehash); | |
63a4681f DH |
1720 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) |
1721 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
79ddbfa5 | 1722 | afs_edit_dir_for_rename_0); |
63a4681f DH |
1723 | |
1724 | if (!new_negative && | |
1725 | test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1726 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
79ddbfa5 | 1727 | afs_edit_dir_for_rename_1); |
63a4681f DH |
1728 | |
1729 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) | |
1730 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
79ddbfa5 DH |
1731 | &vnode->fid, afs_edit_dir_for_rename_2); |
1732 | ||
1733 | new_inode = d_inode(new_dentry); | |
1734 | if (new_inode) { | |
1735 | spin_lock(&new_inode->i_lock); | |
1736 | if (new_inode->i_nlink > 0) | |
1737 | drop_nlink(new_inode); | |
1738 | spin_unlock(&new_inode->i_lock); | |
1739 | } | |
1740 | d_move(old_dentry, new_dentry); | |
1741 | goto error_tmp; | |
63a4681f DH |
1742 | } |
1743 | ||
79ddbfa5 DH |
1744 | error_rehash: |
1745 | if (rehash) | |
1746 | d_rehash(rehash); | |
1747 | error_tmp: | |
1748 | if (tmp) | |
1749 | dput(tmp); | |
260a9803 DH |
1750 | key_put(key); |
1751 | error: | |
260a9803 DH |
1752 | _leave(" = %d", ret); |
1753 | return ret; | |
1754 | } | |
f3ddee8d DH |
1755 | |
1756 | /* | |
1757 | * Release a directory page and clean up its private state if it's not busy | |
1758 | * - return true if the page can now be released, false if not | |
1759 | */ | |
1760 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) | |
1761 | { | |
1762 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1763 | ||
3b6492df | 1764 | _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); |
f3ddee8d DH |
1765 | |
1766 | set_page_private(page, 0); | |
1767 | ClearPagePrivate(page); | |
1768 | ||
1769 | /* The directory will need reloading. */ | |
1770 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1771 | afs_stat_v(dvnode, n_relpg); | |
1772 | return 1; | |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * invalidate part or all of a page | |
1777 | * - release a page and clean up its private data if offset is 0 (indicating | |
1778 | * the entire page) | |
1779 | */ | |
1780 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
1781 | unsigned int length) | |
1782 | { | |
1783 | struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); | |
1784 | ||
1785 | _enter("{%lu},%u,%u", page->index, offset, length); | |
1786 | ||
1787 | BUG_ON(!PageLocked(page)); | |
1788 | ||
1789 | /* The directory will need reloading. */ | |
1790 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
1791 | afs_stat_v(dvnode, n_inval); | |
1792 | ||
1793 | /* we clean up only if the entire page is being invalidated */ | |
1794 | if (offset == 0 && length == PAGE_SIZE) { | |
1795 | set_page_private(page, 0); | |
1796 | ClearPagePrivate(page); | |
1797 | } | |
1798 | } |