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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/dir.c | |
4 | * | |
5 | * Copyright (C) 1992 Rick Sladkey | |
6 | * | |
7 | * nfs directory handling functions | |
8 | * | |
9 | * 10 Apr 1996 Added silly rename for unlink --okir | |
10 | * 28 Sep 1996 Improved directory cache --okir | |
11 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
12 | * Re-implemented silly rename for unlink, newly implemented | |
13 | * silly rename for nfs_rename() following the suggestions | |
14 | * of Olaf Kirch (okir) found in this file. | |
15 | * Following Linus comments on my original hack, this version | |
16 | * depends only on the dcache stuff and doesn't touch the inode | |
17 | * layer (iput() and friends). | |
18 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
19 | */ | |
20 | ||
ddda8e0a | 21 | #include <linux/module.h> |
1da177e4 LT |
22 | #include <linux/time.h> |
23 | #include <linux/errno.h> | |
24 | #include <linux/stat.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/sunrpc/clnt.h> | |
31 | #include <linux/nfs_fs.h> | |
32 | #include <linux/nfs_mount.h> | |
33 | #include <linux/pagemap.h> | |
873101b3 | 34 | #include <linux/pagevec.h> |
1da177e4 | 35 | #include <linux/namei.h> |
54ceac45 | 36 | #include <linux/mount.h> |
a0b8cab3 | 37 | #include <linux/swap.h> |
e8edc6e0 | 38 | #include <linux/sched.h> |
04e4bd1c | 39 | #include <linux/kmemleak.h> |
64c2ce8b | 40 | #include <linux/xattr.h> |
1da177e4 LT |
41 | |
42 | #include "delegation.h" | |
91d5b470 | 43 | #include "iostat.h" |
4c30d56e | 44 | #include "internal.h" |
cd9a1c0e | 45 | #include "fscache.h" |
1da177e4 | 46 | |
f4ce1299 TM |
47 | #include "nfstrace.h" |
48 | ||
1da177e4 LT |
49 | /* #define NFS_DEBUG_VERBOSE 1 */ |
50 | ||
51 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 52 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 53 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 54 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 55 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 56 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 57 | |
4b6f5d20 | 58 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 59 | .llseek = nfs_llseek_dir, |
1da177e4 | 60 | .read = generic_read_dir, |
93a6ab7b | 61 | .iterate_shared = nfs_readdir, |
1da177e4 | 62 | .open = nfs_opendir, |
480c2006 | 63 | .release = nfs_closedir, |
1da177e4 LT |
64 | .fsync = nfs_fsync_dir, |
65 | }; | |
66 | ||
11de3b11 TM |
67 | const struct address_space_operations nfs_dir_aops = { |
68 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
69 | }; |
70 | ||
93b8959a | 71 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir) |
480c2006 | 72 | { |
311324ad | 73 | struct nfs_inode *nfsi = NFS_I(dir); |
480c2006 BS |
74 | struct nfs_open_dir_context *ctx; |
75 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
76 | if (ctx != NULL) { | |
8ef2ce3e | 77 | ctx->duped = 0; |
311324ad | 78 | ctx->attr_gencount = nfsi->attr_gencount; |
480c2006 | 79 | ctx->dir_cookie = 0; |
8ef2ce3e | 80 | ctx->dup_cookie = 0; |
311324ad | 81 | spin_lock(&dir->i_lock); |
1c341b77 TM |
82 | if (list_empty(&nfsi->open_files) && |
83 | (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) | |
84 | nfsi->cache_validity |= NFS_INO_INVALID_DATA | | |
85 | NFS_INO_REVAL_FORCED; | |
311324ad TM |
86 | list_add(&ctx->list, &nfsi->open_files); |
87 | spin_unlock(&dir->i_lock); | |
0c030806 TM |
88 | return ctx; |
89 | } | |
90 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
91 | } |
92 | ||
311324ad | 93 | static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) |
480c2006 | 94 | { |
311324ad TM |
95 | spin_lock(&dir->i_lock); |
96 | list_del(&ctx->list); | |
97 | spin_unlock(&dir->i_lock); | |
480c2006 BS |
98 | kfree(ctx); |
99 | } | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Open file | |
103 | */ | |
104 | static int | |
105 | nfs_opendir(struct inode *inode, struct file *filp) | |
106 | { | |
480c2006 BS |
107 | int res = 0; |
108 | struct nfs_open_dir_context *ctx; | |
1da177e4 | 109 | |
6de1472f | 110 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
111 | |
112 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 113 | |
93b8959a | 114 | ctx = alloc_nfs_open_dir_context(inode); |
480c2006 BS |
115 | if (IS_ERR(ctx)) { |
116 | res = PTR_ERR(ctx); | |
117 | goto out; | |
118 | } | |
119 | filp->private_data = ctx; | |
480c2006 | 120 | out: |
1da177e4 LT |
121 | return res; |
122 | } | |
123 | ||
480c2006 BS |
124 | static int |
125 | nfs_closedir(struct inode *inode, struct file *filp) | |
126 | { | |
a455589f | 127 | put_nfs_open_dir_context(file_inode(filp), filp->private_data); |
480c2006 BS |
128 | return 0; |
129 | } | |
130 | ||
d1bacf9e BS |
131 | struct nfs_cache_array_entry { |
132 | u64 cookie; | |
133 | u64 ino; | |
a52a8a6a TM |
134 | const char *name; |
135 | unsigned int name_len; | |
0b26a0bf | 136 | unsigned char d_type; |
d1bacf9e BS |
137 | }; |
138 | ||
139 | struct nfs_cache_array { | |
d1bacf9e | 140 | u64 last_cookie; |
b1e21c97 TM |
141 | unsigned int size; |
142 | unsigned char page_full : 1, | |
762567b7 TM |
143 | page_is_eof : 1, |
144 | cookies_are_ordered : 1; | |
5601cda8 | 145 | struct nfs_cache_array_entry array[]; |
d1bacf9e BS |
146 | }; |
147 | ||
6c981eff | 148 | struct nfs_readdir_descriptor { |
1da177e4 LT |
149 | struct file *file; |
150 | struct page *page; | |
23db8620 | 151 | struct dir_context *ctx; |
1f1d4aa4 | 152 | pgoff_t page_index; |
2e7a4641 | 153 | u64 dir_cookie; |
0aded708 | 154 | u64 last_cookie; |
2e7a4641 | 155 | u64 dup_cookie; |
f0dd2136 | 156 | loff_t current_index; |
59e356a9 | 157 | loff_t prev_index; |
d1bacf9e | 158 | |
b593c09f | 159 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
a1147b82 | 160 | unsigned long dir_verifier; |
1f4eab7e | 161 | unsigned long timestamp; |
4704f0e2 | 162 | unsigned long gencount; |
2e7a4641 | 163 | unsigned long attr_gencount; |
d1bacf9e | 164 | unsigned int cache_entry_index; |
2e7a4641 | 165 | signed char duped; |
a7a3b1e9 BC |
166 | bool plus; |
167 | bool eof; | |
6c981eff | 168 | }; |
1da177e4 | 169 | |
1f1d4aa4 TM |
170 | static void nfs_readdir_array_init(struct nfs_cache_array *array) |
171 | { | |
172 | memset(array, 0, sizeof(struct nfs_cache_array)); | |
173 | } | |
174 | ||
175 | static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie) | |
4b310319 TM |
176 | { |
177 | struct nfs_cache_array *array; | |
178 | ||
179 | array = kmap_atomic(page); | |
1f1d4aa4 TM |
180 | nfs_readdir_array_init(array); |
181 | array->last_cookie = last_cookie; | |
762567b7 | 182 | array->cookies_are_ordered = 1; |
4b310319 TM |
183 | kunmap_atomic(array); |
184 | } | |
185 | ||
d1bacf9e BS |
186 | /* |
187 | * we are freeing strings created by nfs_add_to_readdir_array() | |
188 | */ | |
189 | static | |
11de3b11 | 190 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 191 | { |
11de3b11 | 192 | struct nfs_cache_array *array; |
d1bacf9e | 193 | int i; |
8cd51a0c | 194 | |
2b86ce2d | 195 | array = kmap_atomic(page); |
b044f645 | 196 | for (i = 0; i < array->size; i++) |
a52a8a6a | 197 | kfree(array->array[i].name); |
1f1d4aa4 | 198 | nfs_readdir_array_init(array); |
2b86ce2d | 199 | kunmap_atomic(array); |
d1bacf9e BS |
200 | } |
201 | ||
35df59d3 TM |
202 | static struct page * |
203 | nfs_readdir_page_array_alloc(u64 last_cookie, gfp_t gfp_flags) | |
204 | { | |
205 | struct page *page = alloc_page(gfp_flags); | |
206 | if (page) | |
207 | nfs_readdir_page_init_array(page, last_cookie); | |
208 | return page; | |
209 | } | |
210 | ||
211 | static void nfs_readdir_page_array_free(struct page *page) | |
212 | { | |
213 | if (page) { | |
214 | nfs_readdir_clear_array(page); | |
215 | put_page(page); | |
216 | } | |
217 | } | |
218 | ||
b1e21c97 TM |
219 | static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) |
220 | { | |
221 | array->page_is_eof = 1; | |
222 | array->page_full = 1; | |
223 | } | |
224 | ||
225 | static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) | |
226 | { | |
227 | return array->page_full; | |
228 | } | |
229 | ||
d1bacf9e BS |
230 | /* |
231 | * the caller is responsible for freeing qstr.name | |
232 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
233 | * nfs_clear_readdir_array() | |
234 | */ | |
a52a8a6a | 235 | static const char *nfs_readdir_copy_name(const char *name, unsigned int len) |
d1bacf9e | 236 | { |
a52a8a6a TM |
237 | const char *ret = kmemdup_nul(name, len, GFP_KERNEL); |
238 | ||
04e4bd1c CM |
239 | /* |
240 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
241 | * in a page cache page which kmemleak does not scan. | |
242 | */ | |
a52a8a6a TM |
243 | if (ret != NULL) |
244 | kmemleak_not_leak(ret); | |
245 | return ret; | |
d1bacf9e BS |
246 | } |
247 | ||
b1e21c97 TM |
248 | /* |
249 | * Check that the next array entry lies entirely within the page bounds | |
250 | */ | |
251 | static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) | |
252 | { | |
253 | struct nfs_cache_array_entry *cache_entry; | |
254 | ||
255 | if (array->page_full) | |
256 | return -ENOSPC; | |
257 | cache_entry = &array->array[array->size + 1]; | |
258 | if ((char *)cache_entry - (char *)array > PAGE_SIZE) { | |
259 | array->page_full = 1; | |
260 | return -ENOSPC; | |
261 | } | |
4a201d6e | 262 | return 0; |
d1bacf9e BS |
263 | } |
264 | ||
265 | static | |
266 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
267 | { | |
a52a8a6a | 268 | struct nfs_cache_array *array; |
4a201d6e | 269 | struct nfs_cache_array_entry *cache_entry; |
a52a8a6a | 270 | const char *name; |
4a201d6e TM |
271 | int ret; |
272 | ||
a52a8a6a TM |
273 | name = nfs_readdir_copy_name(entry->name, entry->len); |
274 | if (!name) | |
275 | return -ENOMEM; | |
3020093f | 276 | |
a52a8a6a | 277 | array = kmap_atomic(page); |
b1e21c97 | 278 | ret = nfs_readdir_array_can_expand(array); |
a52a8a6a TM |
279 | if (ret) { |
280 | kfree(name); | |
4a201d6e | 281 | goto out; |
a52a8a6a | 282 | } |
d1bacf9e | 283 | |
b1e21c97 | 284 | cache_entry = &array->array[array->size]; |
4a201d6e TM |
285 | cache_entry->cookie = entry->prev_cookie; |
286 | cache_entry->ino = entry->ino; | |
0b26a0bf | 287 | cache_entry->d_type = entry->d_type; |
a52a8a6a TM |
288 | cache_entry->name_len = entry->len; |
289 | cache_entry->name = name; | |
d1bacf9e | 290 | array->last_cookie = entry->cookie; |
762567b7 TM |
291 | if (array->last_cookie <= cache_entry->cookie) |
292 | array->cookies_are_ordered = 0; | |
8cd51a0c | 293 | array->size++; |
47c716cb | 294 | if (entry->eof != 0) |
b1e21c97 | 295 | nfs_readdir_array_set_eof(array); |
4a201d6e | 296 | out: |
a52a8a6a | 297 | kunmap_atomic(array); |
4a201d6e | 298 | return ret; |
d1bacf9e BS |
299 | } |
300 | ||
1f1d4aa4 TM |
301 | static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, |
302 | pgoff_t index, u64 last_cookie) | |
303 | { | |
304 | struct page *page; | |
305 | ||
306 | page = grab_cache_page(mapping, index); | |
307 | if (page && !PageUptodate(page)) { | |
308 | nfs_readdir_page_init_array(page, last_cookie); | |
309 | if (invalidate_inode_pages2_range(mapping, index + 1, -1) < 0) | |
310 | nfs_zap_mapping(mapping->host, mapping); | |
311 | SetPageUptodate(page); | |
312 | } | |
313 | ||
314 | return page; | |
315 | } | |
316 | ||
317 | static u64 nfs_readdir_page_last_cookie(struct page *page) | |
318 | { | |
319 | struct nfs_cache_array *array; | |
320 | u64 ret; | |
321 | ||
322 | array = kmap_atomic(page); | |
323 | ret = array->last_cookie; | |
324 | kunmap_atomic(array); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | static bool nfs_readdir_page_needs_filling(struct page *page) | |
329 | { | |
330 | struct nfs_cache_array *array; | |
331 | bool ret; | |
332 | ||
333 | array = kmap_atomic(page); | |
334 | ret = !nfs_readdir_array_is_full(array); | |
335 | kunmap_atomic(array); | |
4a201d6e | 336 | return ret; |
d1bacf9e BS |
337 | } |
338 | ||
b1e21c97 TM |
339 | static void nfs_readdir_page_set_eof(struct page *page) |
340 | { | |
341 | struct nfs_cache_array *array; | |
342 | ||
343 | array = kmap_atomic(page); | |
344 | nfs_readdir_array_set_eof(array); | |
345 | kunmap_atomic(array); | |
346 | } | |
347 | ||
3b2a09f1 TM |
348 | static void nfs_readdir_page_unlock_and_put(struct page *page) |
349 | { | |
350 | unlock_page(page); | |
351 | put_page(page); | |
352 | } | |
353 | ||
354 | static struct page *nfs_readdir_page_get_next(struct address_space *mapping, | |
355 | pgoff_t index, u64 cookie) | |
356 | { | |
357 | struct page *page; | |
358 | ||
359 | page = nfs_readdir_page_get_locked(mapping, index, cookie); | |
360 | if (page) { | |
361 | if (nfs_readdir_page_last_cookie(page) == cookie) | |
362 | return page; | |
363 | nfs_readdir_page_unlock_and_put(page); | |
364 | } | |
365 | return NULL; | |
366 | } | |
367 | ||
59e356a9 TM |
368 | static inline |
369 | int is_32bit_api(void) | |
370 | { | |
371 | #ifdef CONFIG_COMPAT | |
372 | return in_compat_syscall(); | |
373 | #else | |
374 | return (BITS_PER_LONG == 32); | |
375 | #endif | |
376 | } | |
377 | ||
378 | static | |
379 | bool nfs_readdir_use_cookie(const struct file *filp) | |
380 | { | |
381 | if ((filp->f_mode & FMODE_32BITHASH) || | |
382 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) | |
383 | return false; | |
384 | return true; | |
385 | } | |
386 | ||
6c981eff TM |
387 | static int nfs_readdir_search_for_pos(struct nfs_cache_array *array, |
388 | struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 389 | { |
23db8620 | 390 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
391 | unsigned int index; |
392 | ||
393 | if (diff < 0) | |
394 | goto out_eof; | |
395 | if (diff >= array->size) { | |
b1e21c97 | 396 | if (array->page_is_eof) |
d1bacf9e | 397 | goto out_eof; |
d1bacf9e BS |
398 | return -EAGAIN; |
399 | } | |
400 | ||
401 | index = (unsigned int)diff; | |
2e7a4641 | 402 | desc->dir_cookie = array->array[index].cookie; |
d1bacf9e | 403 | desc->cache_entry_index = index; |
d1bacf9e BS |
404 | return 0; |
405 | out_eof: | |
6089dd0d | 406 | desc->eof = true; |
d1bacf9e BS |
407 | return -EBADCOOKIE; |
408 | } | |
409 | ||
4db72b40 JL |
410 | static bool |
411 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
412 | { | |
413 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
414 | return false; | |
415 | smp_rmb(); | |
416 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
417 | } | |
418 | ||
762567b7 TM |
419 | static bool nfs_readdir_array_cookie_in_range(struct nfs_cache_array *array, |
420 | u64 cookie) | |
421 | { | |
422 | if (!array->cookies_are_ordered) | |
423 | return true; | |
424 | /* Optimisation for monotonically increasing cookies */ | |
425 | if (cookie >= array->last_cookie) | |
426 | return false; | |
427 | if (array->size && cookie < array->array[0].cookie) | |
428 | return false; | |
429 | return true; | |
430 | } | |
431 | ||
6c981eff TM |
432 | static int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, |
433 | struct nfs_readdir_descriptor *desc) | |
d1bacf9e BS |
434 | { |
435 | int i; | |
8ef2ce3e | 436 | loff_t new_pos; |
d1bacf9e BS |
437 | int status = -EAGAIN; |
438 | ||
762567b7 TM |
439 | if (!nfs_readdir_array_cookie_in_range(array, desc->dir_cookie)) |
440 | goto check_eof; | |
441 | ||
d1bacf9e | 442 | for (i = 0; i < array->size; i++) { |
2e7a4641 | 443 | if (array->array[i].cookie == desc->dir_cookie) { |
496ad9aa | 444 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 | 445 | |
8ef2ce3e | 446 | new_pos = desc->current_index + i; |
2e7a4641 | 447 | if (desc->attr_gencount != nfsi->attr_gencount || |
4db72b40 | 448 | !nfs_readdir_inode_mapping_valid(nfsi)) { |
2e7a4641 TM |
449 | desc->duped = 0; |
450 | desc->attr_gencount = nfsi->attr_gencount; | |
59e356a9 | 451 | } else if (new_pos < desc->prev_index) { |
2e7a4641 TM |
452 | if (desc->duped > 0 |
453 | && desc->dup_cookie == desc->dir_cookie) { | |
0c030806 | 454 | if (printk_ratelimit()) { |
6de1472f | 455 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 456 | "Please contact your server vendor. " |
a52a8a6a TM |
457 | "The file: %s has duplicate cookie %llu\n", |
458 | desc->file, array->array[i].name, desc->dir_cookie); | |
0c030806 TM |
459 | } |
460 | status = -ELOOP; | |
461 | goto out; | |
462 | } | |
2e7a4641 TM |
463 | desc->dup_cookie = desc->dir_cookie; |
464 | desc->duped = -1; | |
8ef2ce3e | 465 | } |
59e356a9 | 466 | if (nfs_readdir_use_cookie(desc->file)) |
2e7a4641 | 467 | desc->ctx->pos = desc->dir_cookie; |
59e356a9 TM |
468 | else |
469 | desc->ctx->pos = new_pos; | |
470 | desc->prev_index = new_pos; | |
d1bacf9e | 471 | desc->cache_entry_index = i; |
47c716cb | 472 | return 0; |
d1bacf9e BS |
473 | } |
474 | } | |
762567b7 | 475 | check_eof: |
b1e21c97 | 476 | if (array->page_is_eof) { |
8cd51a0c | 477 | status = -EBADCOOKIE; |
2e7a4641 | 478 | if (desc->dir_cookie == array->last_cookie) |
6089dd0d | 479 | desc->eof = true; |
8cd51a0c | 480 | } |
0c030806 | 481 | out: |
d1bacf9e BS |
482 | return status; |
483 | } | |
484 | ||
6c981eff | 485 | static int nfs_readdir_search_array(struct nfs_readdir_descriptor *desc) |
d1bacf9e BS |
486 | { |
487 | struct nfs_cache_array *array; | |
47c716cb | 488 | int status; |
d1bacf9e | 489 | |
ed09222d | 490 | array = kmap_atomic(desc->page); |
d1bacf9e | 491 | |
2e7a4641 | 492 | if (desc->dir_cookie == 0) |
d1bacf9e BS |
493 | status = nfs_readdir_search_for_pos(array, desc); |
494 | else | |
495 | status = nfs_readdir_search_for_cookie(array, desc); | |
496 | ||
47c716cb | 497 | if (status == -EAGAIN) { |
0aded708 | 498 | desc->last_cookie = array->last_cookie; |
e47c085a | 499 | desc->current_index += array->size; |
47c716cb TM |
500 | desc->page_index++; |
501 | } | |
ed09222d | 502 | kunmap_atomic(array); |
d1bacf9e BS |
503 | return status; |
504 | } | |
505 | ||
506 | /* Fill a page with xdr information before transferring to the cache page */ | |
93b8959a | 507 | static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, |
b593c09f TM |
508 | __be32 *verf, u64 cookie, |
509 | struct page **pages, size_t bufsize, | |
510 | __be32 *verf_res) | |
1da177e4 | 511 | { |
82e22a5e | 512 | struct inode *inode = file_inode(desc->file); |
82e22a5e TM |
513 | struct nfs_readdir_arg arg = { |
514 | .dentry = file_dentry(desc->file), | |
515 | .cred = desc->file->f_cred, | |
b593c09f | 516 | .verf = verf, |
82e22a5e TM |
517 | .cookie = cookie, |
518 | .pages = pages, | |
519 | .page_len = bufsize, | |
520 | .plus = desc->plus, | |
521 | }; | |
522 | struct nfs_readdir_res res = { | |
523 | .verf = verf_res, | |
524 | }; | |
4704f0e2 | 525 | unsigned long timestamp, gencount; |
1da177e4 LT |
526 | int error; |
527 | ||
1da177e4 LT |
528 | again: |
529 | timestamp = jiffies; | |
4704f0e2 | 530 | gencount = nfs_inc_attr_generation_counter(); |
a1147b82 | 531 | desc->dir_verifier = nfs_save_change_attribute(inode); |
82e22a5e | 532 | error = NFS_PROTO(inode)->readdir(&arg, &res); |
1da177e4 LT |
533 | if (error < 0) { |
534 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
535 | if (error == -ENOTSUPP && desc->plus) { | |
536 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 537 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
82e22a5e | 538 | desc->plus = arg.plus = false; |
1da177e4 LT |
539 | goto again; |
540 | } | |
541 | goto error; | |
542 | } | |
1f4eab7e | 543 | desc->timestamp = timestamp; |
4704f0e2 | 544 | desc->gencount = gencount; |
d1bacf9e BS |
545 | error: |
546 | return error; | |
1da177e4 LT |
547 | } |
548 | ||
6c981eff | 549 | static int xdr_decode(struct nfs_readdir_descriptor *desc, |
573c4e1e | 550 | struct nfs_entry *entry, struct xdr_stream *xdr) |
1da177e4 | 551 | { |
59e356a9 | 552 | struct inode *inode = file_inode(desc->file); |
573c4e1e | 553 | int error; |
1da177e4 | 554 | |
59e356a9 | 555 | error = NFS_PROTO(inode)->decode_dirent(xdr, entry, desc->plus); |
573c4e1e CL |
556 | if (error) |
557 | return error; | |
d1bacf9e BS |
558 | entry->fattr->time_start = desc->timestamp; |
559 | entry->fattr->gencount = desc->gencount; | |
560 | return 0; | |
1da177e4 LT |
561 | } |
562 | ||
fa923369 TM |
563 | /* Match file and dirent using either filehandle or fileid |
564 | * Note: caller is responsible for checking the fsid | |
565 | */ | |
d39ab9de BS |
566 | static |
567 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
568 | { | |
d8fdb47f | 569 | struct inode *inode; |
fa923369 TM |
570 | struct nfs_inode *nfsi; |
571 | ||
2b0143b5 DH |
572 | if (d_really_is_negative(dentry)) |
573 | return 0; | |
fa923369 | 574 | |
d8fdb47f TM |
575 | inode = d_inode(dentry); |
576 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
577 | return 0; | |
578 | ||
579 | nfsi = NFS_I(inode); | |
7dc72d5f TM |
580 | if (entry->fattr->fileid != nfsi->fileid) |
581 | return 0; | |
582 | if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) | |
583 | return 0; | |
584 | return 1; | |
d39ab9de BS |
585 | } |
586 | ||
d69ee9b8 | 587 | static |
23db8620 | 588 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
589 | { |
590 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
591 | return false; | |
592 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
593 | return true; | |
23db8620 | 594 | if (ctx->pos == 0) |
d69ee9b8 TM |
595 | return true; |
596 | return false; | |
597 | } | |
598 | ||
599 | /* | |
63519fbc TM |
600 | * This function is called by the lookup and getattr code to request the |
601 | * use of readdirplus to accelerate any future lookups in the same | |
d69ee9b8 TM |
602 | * directory. |
603 | */ | |
d69ee9b8 TM |
604 | void nfs_advise_use_readdirplus(struct inode *dir) |
605 | { | |
63519fbc TM |
606 | struct nfs_inode *nfsi = NFS_I(dir); |
607 | ||
608 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
609 | !list_empty(&nfsi->open_files)) | |
610 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
d69ee9b8 TM |
611 | } |
612 | ||
311324ad TM |
613 | /* |
614 | * This function is mainly for use by nfs_getattr(). | |
615 | * | |
616 | * If this is an 'ls -l', we want to force use of readdirplus. | |
617 | * Do this by checking if there is an active file descriptor | |
618 | * and calling nfs_advise_use_readdirplus, then forcing a | |
619 | * cache flush. | |
620 | */ | |
621 | void nfs_force_use_readdirplus(struct inode *dir) | |
622 | { | |
63519fbc TM |
623 | struct nfs_inode *nfsi = NFS_I(dir); |
624 | ||
625 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
626 | !list_empty(&nfsi->open_files)) { | |
627 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
227823d2 DN |
628 | invalidate_mapping_pages(dir->i_mapping, |
629 | nfsi->page_index + 1, -1); | |
311324ad TM |
630 | } |
631 | } | |
632 | ||
d39ab9de | 633 | static |
a1147b82 TM |
634 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, |
635 | unsigned long dir_verifier) | |
d39ab9de | 636 | { |
26fe5750 | 637 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
9ac3d3e8 | 638 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
4a201d6e TM |
639 | struct dentry *dentry; |
640 | struct dentry *alias; | |
d39ab9de | 641 | struct inode *inode; |
aa9c2669 | 642 | int status; |
d39ab9de | 643 | |
fa923369 TM |
644 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) |
645 | return; | |
6c441c25 TM |
646 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
647 | return; | |
78d04af4 TM |
648 | if (filename.len == 0) |
649 | return; | |
650 | /* Validate that the name doesn't contain any illegal '\0' */ | |
651 | if (strnlen(filename.name, filename.len) != filename.len) | |
652 | return; | |
653 | /* ...or '/' */ | |
654 | if (strnchr(filename.name, filename.len, '/')) | |
655 | return; | |
4a201d6e TM |
656 | if (filename.name[0] == '.') { |
657 | if (filename.len == 1) | |
658 | return; | |
659 | if (filename.len == 2 && filename.name[1] == '.') | |
660 | return; | |
661 | } | |
8387ff25 | 662 | filename.hash = full_name_hash(parent, filename.name, filename.len); |
d39ab9de | 663 | |
4a201d6e | 664 | dentry = d_lookup(parent, &filename); |
9ac3d3e8 AV |
665 | again: |
666 | if (!dentry) { | |
667 | dentry = d_alloc_parallel(parent, &filename, &wq); | |
668 | if (IS_ERR(dentry)) | |
669 | return; | |
670 | } | |
671 | if (!d_in_lookup(dentry)) { | |
6c441c25 TM |
672 | /* Is there a mountpoint here? If so, just exit */ |
673 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
674 | &entry->fattr->fsid)) | |
675 | goto out; | |
d39ab9de | 676 | if (nfs_same_file(dentry, entry)) { |
7dc72d5f TM |
677 | if (!entry->fh->size) |
678 | goto out; | |
a1147b82 | 679 | nfs_set_verifier(dentry, dir_verifier); |
2b0143b5 | 680 | status = nfs_refresh_inode(d_inode(dentry), entry->fattr); |
aa9c2669 | 681 | if (!status) |
2b0143b5 | 682 | nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); |
d39ab9de BS |
683 | goto out; |
684 | } else { | |
5542aa2f | 685 | d_invalidate(dentry); |
d39ab9de | 686 | dput(dentry); |
9ac3d3e8 AV |
687 | dentry = NULL; |
688 | goto again; | |
d39ab9de BS |
689 | } |
690 | } | |
7dc72d5f TM |
691 | if (!entry->fh->size) { |
692 | d_lookup_done(dentry); | |
693 | goto out; | |
694 | } | |
d39ab9de | 695 | |
1775fd3e | 696 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
41d28bca | 697 | alias = d_splice_alias(inode, dentry); |
9ac3d3e8 AV |
698 | d_lookup_done(dentry); |
699 | if (alias) { | |
700 | if (IS_ERR(alias)) | |
701 | goto out; | |
702 | dput(dentry); | |
703 | dentry = alias; | |
704 | } | |
a1147b82 | 705 | nfs_set_verifier(dentry, dir_verifier); |
d39ab9de BS |
706 | out: |
707 | dput(dentry); | |
d39ab9de BS |
708 | } |
709 | ||
d1bacf9e | 710 | /* Perform conversion from xdr to cache array */ |
3b2a09f1 TM |
711 | static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc, |
712 | struct nfs_entry *entry, | |
713 | struct page **xdr_pages, | |
35df59d3 TM |
714 | unsigned int buflen, |
715 | struct page **arrays, | |
716 | size_t narrays) | |
1da177e4 | 717 | { |
3b2a09f1 | 718 | struct address_space *mapping = desc->file->f_mapping; |
babddc72 | 719 | struct xdr_stream stream; |
f7da7a12 | 720 | struct xdr_buf buf; |
35df59d3 | 721 | struct page *scratch, *new, *page = *arrays; |
5c346854 | 722 | int status; |
babddc72 | 723 | |
6650239a TM |
724 | scratch = alloc_page(GFP_KERNEL); |
725 | if (scratch == NULL) | |
726 | return -ENOMEM; | |
babddc72 | 727 | |
f7da7a12 | 728 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
0ae4c3e8 | 729 | xdr_set_scratch_page(&stream, scratch); |
99424380 BS |
730 | |
731 | do { | |
d33030e2 JM |
732 | if (entry->label) |
733 | entry->label->len = NFS4_MAXLABELLEN; | |
734 | ||
99424380 | 735 | status = xdr_decode(desc, entry, &stream); |
972bcdf2 | 736 | if (status != 0) |
99424380 | 737 | break; |
5c346854 | 738 | |
a7a3b1e9 | 739 | if (desc->plus) |
a1147b82 TM |
740 | nfs_prime_dcache(file_dentry(desc->file), entry, |
741 | desc->dir_verifier); | |
8cd51a0c | 742 | |
db531db9 | 743 | status = nfs_readdir_add_to_array(entry, page); |
3b2a09f1 TM |
744 | if (status != -ENOSPC) |
745 | continue; | |
746 | ||
35df59d3 TM |
747 | if (page->mapping != mapping) { |
748 | if (!--narrays) | |
749 | break; | |
750 | new = nfs_readdir_page_array_alloc(entry->prev_cookie, | |
751 | GFP_KERNEL); | |
752 | if (!new) | |
753 | break; | |
754 | arrays++; | |
755 | *arrays = page = new; | |
756 | } else { | |
757 | new = nfs_readdir_page_get_next(mapping, | |
758 | page->index + 1, | |
759 | entry->prev_cookie); | |
760 | if (!new) | |
761 | break; | |
762 | if (page != *arrays) | |
763 | nfs_readdir_page_unlock_and_put(page); | |
764 | page = new; | |
765 | } | |
3b2a09f1 | 766 | status = nfs_readdir_add_to_array(entry, page); |
972bcdf2 | 767 | } while (!status && !entry->eof); |
99424380 | 768 | |
972bcdf2 TM |
769 | switch (status) { |
770 | case -EBADCOOKIE: | |
771 | if (entry->eof) { | |
772 | nfs_readdir_page_set_eof(page); | |
773 | status = 0; | |
774 | } | |
775 | break; | |
776 | case -ENOSPC: | |
777 | case -EAGAIN: | |
0795bf83 | 778 | status = 0; |
972bcdf2 | 779 | break; |
1da177e4 | 780 | } |
6650239a | 781 | |
35df59d3 | 782 | if (page != *arrays) |
3b2a09f1 TM |
783 | nfs_readdir_page_unlock_and_put(page); |
784 | ||
6650239a | 785 | put_page(scratch); |
8cd51a0c | 786 | return status; |
56e4ebf8 BS |
787 | } |
788 | ||
1a34c8c9 | 789 | static void nfs_readdir_free_pages(struct page **pages, size_t npages) |
56e4ebf8 | 790 | { |
1a34c8c9 TM |
791 | while (npages--) |
792 | put_page(pages[npages]); | |
793 | kfree(pages); | |
56e4ebf8 BS |
794 | } |
795 | ||
56e4ebf8 | 796 | /* |
bf211ca1 | 797 | * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call |
798 | * to nfs_readdir_free_pages() | |
56e4ebf8 | 799 | */ |
1a34c8c9 | 800 | static struct page **nfs_readdir_alloc_pages(size_t npages) |
56e4ebf8 | 801 | { |
1a34c8c9 TM |
802 | struct page **pages; |
803 | size_t i; | |
56e4ebf8 | 804 | |
1a34c8c9 TM |
805 | pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL); |
806 | if (!pages) | |
807 | return NULL; | |
56e4ebf8 BS |
808 | for (i = 0; i < npages; i++) { |
809 | struct page *page = alloc_page(GFP_KERNEL); | |
810 | if (page == NULL) | |
811 | goto out_freepages; | |
812 | pages[i] = page; | |
813 | } | |
1a34c8c9 | 814 | return pages; |
56e4ebf8 | 815 | |
56e4ebf8 | 816 | out_freepages: |
c7e9668e | 817 | nfs_readdir_free_pages(pages, i); |
1a34c8c9 | 818 | return NULL; |
1da177e4 LT |
819 | } |
820 | ||
6c981eff | 821 | static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc, |
35df59d3 TM |
822 | __be32 *verf_arg, __be32 *verf_res, |
823 | struct page **arrays, size_t narrays) | |
00a92642 | 824 | { |
1a34c8c9 | 825 | struct page **pages; |
35df59d3 | 826 | struct page *page = *arrays; |
6b75cf9e | 827 | struct nfs_entry *entry; |
1a34c8c9 | 828 | size_t array_size; |
b593c09f | 829 | struct inode *inode = file_inode(desc->file); |
1a34c8c9 | 830 | size_t dtsize = NFS_SERVER(inode)->dtsize; |
8cd51a0c | 831 | int status = -ENOMEM; |
d1bacf9e | 832 | |
6b75cf9e TM |
833 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
834 | if (!entry) | |
835 | return -ENOMEM; | |
836 | entry->cookie = nfs_readdir_page_last_cookie(page); | |
837 | entry->fh = nfs_alloc_fhandle(); | |
838 | entry->fattr = nfs_alloc_fattr(); | |
839 | entry->server = NFS_SERVER(inode); | |
840 | if (entry->fh == NULL || entry->fattr == NULL) | |
d1bacf9e | 841 | goto out; |
00a92642 | 842 | |
6b75cf9e TM |
843 | entry->label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
844 | if (IS_ERR(entry->label)) { | |
845 | status = PTR_ERR(entry->label); | |
14c43f76 DQ |
846 | goto out; |
847 | } | |
848 | ||
1a34c8c9 TM |
849 | array_size = (dtsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
850 | pages = nfs_readdir_alloc_pages(array_size); | |
851 | if (!pages) | |
e762a639 | 852 | goto out_release_label; |
00a92642 | 853 | |
d1bacf9e | 854 | do { |
ac396128 | 855 | unsigned int pglen; |
b593c09f TM |
856 | status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie, |
857 | pages, dtsize, | |
858 | verf_res); | |
d1bacf9e | 859 | if (status < 0) |
00a92642 | 860 | break; |
972bcdf2 | 861 | |
ac396128 | 862 | pglen = status; |
972bcdf2 TM |
863 | if (pglen == 0) { |
864 | nfs_readdir_page_set_eof(page); | |
8cd51a0c TM |
865 | break; |
866 | } | |
972bcdf2 | 867 | |
35df59d3 TM |
868 | status = nfs_readdir_page_filler(desc, entry, pages, pglen, |
869 | arrays, narrays); | |
e762a639 | 870 | } while (!status && nfs_readdir_page_needs_filling(page)); |
d1bacf9e | 871 | |
c7e9668e | 872 | nfs_readdir_free_pages(pages, array_size); |
e762a639 | 873 | out_release_label: |
6b75cf9e | 874 | nfs4_label_free(entry->label); |
d1bacf9e | 875 | out: |
6b75cf9e TM |
876 | nfs_free_fattr(entry->fattr); |
877 | nfs_free_fhandle(entry->fh); | |
878 | kfree(entry); | |
00a92642 OG |
879 | return status; |
880 | } | |
881 | ||
1f1d4aa4 | 882 | static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc) |
1da177e4 | 883 | { |
1f1d4aa4 TM |
884 | put_page(desc->page); |
885 | desc->page = NULL; | |
d1bacf9e | 886 | } |
1da177e4 | 887 | |
1f1d4aa4 TM |
888 | static void |
889 | nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 890 | { |
1f1d4aa4 TM |
891 | unlock_page(desc->page); |
892 | nfs_readdir_page_put(desc); | |
d1bacf9e BS |
893 | } |
894 | ||
1f1d4aa4 TM |
895 | static struct page * |
896 | nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 897 | { |
1f1d4aa4 TM |
898 | return nfs_readdir_page_get_locked(desc->file->f_mapping, |
899 | desc->page_index, | |
900 | desc->last_cookie); | |
1da177e4 LT |
901 | } |
902 | ||
903 | /* | |
d1bacf9e | 904 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
114de382 | 905 | * and locks the page to prevent removal from the page cache. |
1da177e4 | 906 | */ |
6c981eff | 907 | static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) |
d1bacf9e | 908 | { |
227823d2 DN |
909 | struct inode *inode = file_inode(desc->file); |
910 | struct nfs_inode *nfsi = NFS_I(inode); | |
b593c09f | 911 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
d1bacf9e BS |
912 | int res; |
913 | ||
1f1d4aa4 TM |
914 | desc->page = nfs_readdir_page_get_cached(desc); |
915 | if (!desc->page) | |
916 | return -ENOMEM; | |
917 | if (nfs_readdir_page_needs_filling(desc->page)) { | |
35df59d3 TM |
918 | res = nfs_readdir_xdr_to_array(desc, nfsi->cookieverf, verf, |
919 | &desc->page, 1); | |
9fff59ed TM |
920 | if (res < 0) { |
921 | nfs_readdir_page_unlock_and_put_cached(desc); | |
922 | if (res == -EBADCOOKIE || res == -ENOTSYNC) { | |
923 | invalidate_inode_pages2(desc->file->f_mapping); | |
924 | desc->page_index = 0; | |
925 | return -EAGAIN; | |
926 | } | |
927 | return res; | |
227823d2 | 928 | } |
b593c09f | 929 | memcpy(nfsi->cookieverf, verf, sizeof(nfsi->cookieverf)); |
114de382 | 930 | } |
1f1d4aa4 TM |
931 | res = nfs_readdir_search_array(desc); |
932 | if (res == 0) { | |
933 | nfsi->page_index = desc->page_index; | |
934 | return 0; | |
114de382 | 935 | } |
1f1d4aa4 | 936 | nfs_readdir_page_unlock_and_put_cached(desc); |
d1bacf9e BS |
937 | return res; |
938 | } | |
939 | ||
794092c5 TM |
940 | static bool nfs_readdir_dont_search_cache(struct nfs_readdir_descriptor *desc) |
941 | { | |
942 | struct address_space *mapping = desc->file->f_mapping; | |
943 | struct inode *dir = file_inode(desc->file); | |
944 | unsigned int dtsize = NFS_SERVER(dir)->dtsize; | |
945 | loff_t size = i_size_read(dir); | |
946 | ||
947 | /* | |
948 | * Default to uncached readdir if the page cache is empty, and | |
949 | * we're looking for a non-zero cookie in a large directory. | |
950 | */ | |
951 | return desc->dir_cookie != 0 && mapping->nrpages == 0 && size > dtsize; | |
952 | } | |
953 | ||
d1bacf9e | 954 | /* Search for desc->dir_cookie from the beginning of the page cache */ |
6c981eff | 955 | static int readdir_search_pagecache(struct nfs_readdir_descriptor *desc) |
1da177e4 | 956 | { |
8cd51a0c | 957 | int res; |
d1bacf9e | 958 | |
794092c5 TM |
959 | if (nfs_readdir_dont_search_cache(desc)) |
960 | return -EBADCOOKIE; | |
961 | ||
47c716cb | 962 | do { |
9fff59ed TM |
963 | if (desc->page_index == 0) { |
964 | desc->current_index = 0; | |
965 | desc->prev_index = 0; | |
966 | desc->last_cookie = 0; | |
967 | } | |
114de382 | 968 | res = find_and_lock_cache_page(desc); |
47c716cb | 969 | } while (res == -EAGAIN); |
1da177e4 LT |
970 | return res; |
971 | } | |
972 | ||
1da177e4 LT |
973 | /* |
974 | * Once we've found the start of the dirent within a page: fill 'er up... | |
975 | */ | |
dbeaf8c9 | 976 | static void nfs_do_filldir(struct nfs_readdir_descriptor *desc) |
1da177e4 LT |
977 | { |
978 | struct file *file = desc->file; | |
b593c09f | 979 | struct nfs_inode *nfsi = NFS_I(file_inode(file)); |
dbeaf8c9 TM |
980 | struct nfs_cache_array *array; |
981 | unsigned int i = 0; | |
8ef2ce3e | 982 | |
0795bf83 | 983 | array = kmap(desc->page); |
d1bacf9e | 984 | for (i = desc->cache_entry_index; i < array->size; i++) { |
ece0b423 | 985 | struct nfs_cache_array_entry *ent; |
1da177e4 | 986 | |
ece0b423 | 987 | ent = &array->array[i]; |
a52a8a6a | 988 | if (!dir_emit(desc->ctx, ent->name, ent->name_len, |
23db8620 | 989 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { |
6089dd0d | 990 | desc->eof = true; |
1da177e4 | 991 | break; |
ece0b423 | 992 | } |
b593c09f | 993 | memcpy(desc->verf, nfsi->cookieverf, sizeof(desc->verf)); |
d1bacf9e | 994 | if (i < (array->size-1)) |
2e7a4641 | 995 | desc->dir_cookie = array->array[i+1].cookie; |
d1bacf9e | 996 | else |
2e7a4641 | 997 | desc->dir_cookie = array->last_cookie; |
59e356a9 | 998 | if (nfs_readdir_use_cookie(file)) |
2e7a4641 | 999 | desc->ctx->pos = desc->dir_cookie; |
59e356a9 TM |
1000 | else |
1001 | desc->ctx->pos++; | |
2e7a4641 TM |
1002 | if (desc->duped != 0) |
1003 | desc->duped = 1; | |
1da177e4 | 1004 | } |
b1e21c97 | 1005 | if (array->page_is_eof) |
6089dd0d | 1006 | desc->eof = true; |
d1bacf9e | 1007 | |
0795bf83 | 1008 | kunmap(desc->page); |
dbeaf8c9 TM |
1009 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %llu\n", |
1010 | (unsigned long long)desc->dir_cookie); | |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | /* | |
1014 | * If we cannot find a cookie in our cache, we suspect that this is | |
1015 | * because it points to a deleted file, so we ask the server to return | |
1016 | * whatever it thinks is the next entry. We then feed this to filldir. | |
1017 | * If all goes well, we should then be able to find our way round the | |
1018 | * cache on the next call to readdir_search_pagecache(); | |
1019 | * | |
1020 | * NOTE: we cannot add the anonymous page to the pagecache because | |
1021 | * the data it contains might not be page aligned. Besides, | |
1022 | * we should already have a complete representation of the | |
1023 | * directory in the page cache by the time we get here. | |
1024 | */ | |
6c981eff | 1025 | static int uncached_readdir(struct nfs_readdir_descriptor *desc) |
1da177e4 | 1026 | { |
35df59d3 TM |
1027 | struct page **arrays; |
1028 | size_t i, sz = 512; | |
b593c09f | 1029 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
35df59d3 | 1030 | int status = -ENOMEM; |
1da177e4 | 1031 | |
35df59d3 | 1032 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %llu\n", |
2e7a4641 | 1033 | (unsigned long long)desc->dir_cookie); |
1da177e4 | 1034 | |
35df59d3 TM |
1035 | arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL); |
1036 | if (!arrays) | |
1037 | goto out; | |
1038 | arrays[0] = nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL); | |
1039 | if (!arrays[0]) | |
1da177e4 | 1040 | goto out; |
d1bacf9e | 1041 | |
7a8e1dc3 | 1042 | desc->page_index = 0; |
2e7a4641 | 1043 | desc->last_cookie = desc->dir_cookie; |
2e7a4641 | 1044 | desc->duped = 0; |
7a8e1dc3 | 1045 | |
35df59d3 | 1046 | status = nfs_readdir_xdr_to_array(desc, desc->verf, verf, arrays, sz); |
1da177e4 | 1047 | |
35df59d3 TM |
1048 | for (i = 0; !desc->eof && i < sz && arrays[i]; i++) { |
1049 | desc->page = arrays[i]; | |
1050 | nfs_do_filldir(desc); | |
1051 | } | |
1052 | desc->page = NULL; | |
1da177e4 | 1053 | |
35df59d3 TM |
1054 | |
1055 | for (i = 0; i < sz && arrays[i]; i++) | |
1056 | nfs_readdir_page_array_free(arrays[i]); | |
1057 | out: | |
1058 | kfree(arrays); | |
1059 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status); | |
1da177e4 | 1060 | return status; |
1da177e4 LT |
1061 | } |
1062 | ||
00a92642 OG |
1063 | /* The file offset position represents the dirent entry number. A |
1064 | last cookie cache takes care of the common case of reading the | |
1065 | whole directory. | |
1da177e4 | 1066 | */ |
23db8620 | 1067 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 1068 | { |
be62a1a8 | 1069 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 1070 | struct inode *inode = d_inode(dentry); |
23db8620 | 1071 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
6b75cf9e TM |
1072 | struct nfs_readdir_descriptor *desc; |
1073 | int res; | |
1da177e4 | 1074 | |
6de1472f AV |
1075 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
1076 | file, (long long)ctx->pos); | |
91d5b470 CL |
1077 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
1078 | ||
1da177e4 | 1079 | /* |
23db8620 | 1080 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 1081 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
1082 | * to either find the entry with the appropriate number or |
1083 | * revalidate the cookie. | |
1da177e4 | 1084 | */ |
6b75cf9e | 1085 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) { |
07b5ce8e | 1086 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
6b75cf9e TM |
1087 | if (res < 0) |
1088 | goto out; | |
1089 | } | |
1090 | ||
1091 | res = -ENOMEM; | |
1092 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
1093 | if (!desc) | |
fccca7fc | 1094 | goto out; |
6b75cf9e TM |
1095 | desc->file = file; |
1096 | desc->ctx = ctx; | |
1097 | desc->plus = nfs_use_readdirplus(inode, ctx); | |
fccca7fc | 1098 | |
2e7a4641 TM |
1099 | spin_lock(&file->f_lock); |
1100 | desc->dir_cookie = dir_ctx->dir_cookie; | |
1101 | desc->dup_cookie = dir_ctx->dup_cookie; | |
1102 | desc->duped = dir_ctx->duped; | |
1103 | desc->attr_gencount = dir_ctx->attr_gencount; | |
b593c09f | 1104 | memcpy(desc->verf, dir_ctx->verf, sizeof(desc->verf)); |
2e7a4641 | 1105 | spin_unlock(&file->f_lock); |
fccca7fc | 1106 | |
47c716cb | 1107 | do { |
1da177e4 | 1108 | res = readdir_search_pagecache(desc); |
00a92642 | 1109 | |
1da177e4 | 1110 | if (res == -EBADCOOKIE) { |
ece0b423 | 1111 | res = 0; |
1da177e4 | 1112 | /* This means either end of directory */ |
2e7a4641 | 1113 | if (desc->dir_cookie && !desc->eof) { |
1da177e4 | 1114 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 1115 | res = uncached_readdir(desc); |
ece0b423 | 1116 | if (res == 0) |
1da177e4 | 1117 | continue; |
9fff59ed TM |
1118 | if (res == -EBADCOOKIE || res == -ENOTSYNC) |
1119 | res = 0; | |
1da177e4 | 1120 | } |
1da177e4 LT |
1121 | break; |
1122 | } | |
1123 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 1124 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 1125 | nfs_zap_caches(inode); |
baf57a09 | 1126 | desc->page_index = 0; |
a7a3b1e9 BC |
1127 | desc->plus = false; |
1128 | desc->eof = false; | |
1da177e4 LT |
1129 | continue; |
1130 | } | |
1131 | if (res < 0) | |
1132 | break; | |
1133 | ||
dbeaf8c9 | 1134 | nfs_do_filldir(desc); |
1f1d4aa4 | 1135 | nfs_readdir_page_unlock_and_put_cached(desc); |
47c716cb | 1136 | } while (!desc->eof); |
2e7a4641 TM |
1137 | |
1138 | spin_lock(&file->f_lock); | |
1139 | dir_ctx->dir_cookie = desc->dir_cookie; | |
1140 | dir_ctx->dup_cookie = desc->dup_cookie; | |
1141 | dir_ctx->duped = desc->duped; | |
1142 | dir_ctx->attr_gencount = desc->attr_gencount; | |
b593c09f | 1143 | memcpy(dir_ctx->verf, desc->verf, sizeof(dir_ctx->verf)); |
2e7a4641 TM |
1144 | spin_unlock(&file->f_lock); |
1145 | ||
6b75cf9e TM |
1146 | kfree(desc); |
1147 | ||
fccca7fc | 1148 | out: |
6de1472f | 1149 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 1150 | return res; |
1da177e4 LT |
1151 | } |
1152 | ||
965c8e59 | 1153 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 1154 | { |
480c2006 | 1155 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 1156 | |
6de1472f AV |
1157 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
1158 | filp, offset, whence); | |
b84e06c5 | 1159 | |
965c8e59 | 1160 | switch (whence) { |
b2b1ff3d TM |
1161 | default: |
1162 | return -EINVAL; | |
1163 | case SEEK_SET: | |
1164 | if (offset < 0) | |
1165 | return -EINVAL; | |
83f2c45e | 1166 | spin_lock(&filp->f_lock); |
b2b1ff3d TM |
1167 | break; |
1168 | case SEEK_CUR: | |
1169 | if (offset == 0) | |
1170 | return filp->f_pos; | |
83f2c45e | 1171 | spin_lock(&filp->f_lock); |
b2b1ff3d TM |
1172 | offset += filp->f_pos; |
1173 | if (offset < 0) { | |
83f2c45e | 1174 | spin_unlock(&filp->f_lock); |
b2b1ff3d TM |
1175 | return -EINVAL; |
1176 | } | |
f0dd2136 TM |
1177 | } |
1178 | if (offset != filp->f_pos) { | |
1179 | filp->f_pos = offset; | |
59e356a9 TM |
1180 | if (nfs_readdir_use_cookie(filp)) |
1181 | dir_ctx->dir_cookie = offset; | |
1182 | else | |
1183 | dir_ctx->dir_cookie = 0; | |
b593c09f TM |
1184 | if (offset == 0) |
1185 | memset(dir_ctx->verf, 0, sizeof(dir_ctx->verf)); | |
8ef2ce3e | 1186 | dir_ctx->duped = 0; |
f0dd2136 | 1187 | } |
83f2c45e | 1188 | spin_unlock(&filp->f_lock); |
f0dd2136 TM |
1189 | return offset; |
1190 | } | |
1191 | ||
1da177e4 LT |
1192 | /* |
1193 | * All directory operations under NFS are synchronous, so fsync() | |
1194 | * is a dummy operation. | |
1195 | */ | |
02c24a82 JB |
1196 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
1197 | int datasync) | |
1da177e4 | 1198 | { |
6de1472f | 1199 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 1200 | |
11decaf8 | 1201 | nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC); |
1da177e4 LT |
1202 | return 0; |
1203 | } | |
1204 | ||
bfc69a45 TM |
1205 | /** |
1206 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
302fad7b | 1207 | * @dir: pointer to directory inode |
bfc69a45 TM |
1208 | * |
1209 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1210 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1211 | * on the server that might have invalidated our dcache. | |
1212 | * | |
efeda80d TM |
1213 | * Note that we reserve bit '0' as a tag to let us know when a dentry |
1214 | * was revalidated while holding a delegation on its inode. | |
1215 | * | |
bfc69a45 TM |
1216 | * The caller should be holding dir->i_lock |
1217 | */ | |
1218 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1219 | { | |
efeda80d | 1220 | NFS_I(dir)->cache_change_attribute += 2; |
bfc69a45 | 1221 | } |
89d77c8f | 1222 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 1223 | |
efeda80d TM |
1224 | /** |
1225 | * nfs_verify_change_attribute - Detects NFS remote directory changes | |
1226 | * @dir: pointer to parent directory inode | |
1227 | * @verf: previously saved change attribute | |
1228 | * | |
1229 | * Return "false" if the verifiers doesn't match the change attribute. | |
1230 | * This would usually indicate that the directory contents have changed on | |
1231 | * the server, and that any dentries need revalidating. | |
1232 | */ | |
1233 | static bool nfs_verify_change_attribute(struct inode *dir, unsigned long verf) | |
1234 | { | |
1235 | return (verf & ~1UL) == nfs_save_change_attribute(dir); | |
1236 | } | |
1237 | ||
1238 | static void nfs_set_verifier_delegated(unsigned long *verf) | |
1239 | { | |
1240 | *verf |= 1UL; | |
1241 | } | |
1242 | ||
1243 | #if IS_ENABLED(CONFIG_NFS_V4) | |
1244 | static void nfs_unset_verifier_delegated(unsigned long *verf) | |
1245 | { | |
1246 | *verf &= ~1UL; | |
1247 | } | |
1248 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ | |
1249 | ||
1250 | static bool nfs_test_verifier_delegated(unsigned long verf) | |
1251 | { | |
1252 | return verf & 1; | |
1253 | } | |
1254 | ||
1255 | static bool nfs_verifier_is_delegated(struct dentry *dentry) | |
1256 | { | |
1257 | return nfs_test_verifier_delegated(dentry->d_time); | |
1258 | } | |
1259 | ||
1260 | static void nfs_set_verifier_locked(struct dentry *dentry, unsigned long verf) | |
1261 | { | |
1262 | struct inode *inode = d_inode(dentry); | |
1263 | ||
1264 | if (!nfs_verifier_is_delegated(dentry) && | |
1265 | !nfs_verify_change_attribute(d_inode(dentry->d_parent), verf)) | |
1266 | goto out; | |
1267 | if (inode && NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) | |
1268 | nfs_set_verifier_delegated(&verf); | |
1269 | out: | |
1270 | dentry->d_time = verf; | |
1271 | } | |
1272 | ||
1273 | /** | |
1274 | * nfs_set_verifier - save a parent directory verifier in the dentry | |
1275 | * @dentry: pointer to dentry | |
1276 | * @verf: verifier to save | |
1277 | * | |
1278 | * Saves the parent directory verifier in @dentry. If the inode has | |
1279 | * a delegation, we also tag the dentry as having been revalidated | |
1280 | * while holding a delegation so that we know we don't have to | |
1281 | * look it up again after a directory change. | |
1282 | */ | |
1283 | void nfs_set_verifier(struct dentry *dentry, unsigned long verf) | |
1284 | { | |
1285 | ||
1286 | spin_lock(&dentry->d_lock); | |
1287 | nfs_set_verifier_locked(dentry, verf); | |
1288 | spin_unlock(&dentry->d_lock); | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(nfs_set_verifier); | |
1291 | ||
1292 | #if IS_ENABLED(CONFIG_NFS_V4) | |
1293 | /** | |
1294 | * nfs_clear_verifier_delegated - clear the dir verifier delegation tag | |
1295 | * @inode: pointer to inode | |
1296 | * | |
1297 | * Iterates through the dentries in the inode alias list and clears | |
1298 | * the tag used to indicate that the dentry has been revalidated | |
1299 | * while holding a delegation. | |
1300 | * This function is intended for use when the delegation is being | |
1301 | * returned or revoked. | |
1302 | */ | |
1303 | void nfs_clear_verifier_delegated(struct inode *inode) | |
1304 | { | |
1305 | struct dentry *alias; | |
1306 | ||
1307 | if (!inode) | |
1308 | return; | |
1309 | spin_lock(&inode->i_lock); | |
1310 | hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { | |
1311 | spin_lock(&alias->d_lock); | |
1312 | nfs_unset_verifier_delegated(&alias->d_time); | |
1313 | spin_unlock(&alias->d_lock); | |
1314 | } | |
1315 | spin_unlock(&inode->i_lock); | |
1316 | } | |
1317 | EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated); | |
1318 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ | |
1319 | ||
1da177e4 LT |
1320 | /* |
1321 | * A check for whether or not the parent directory has changed. | |
1322 | * In the case it has, we assume that the dentries are untrustworthy | |
1323 | * and may need to be looked up again. | |
912a108d | 1324 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 1325 | */ |
912a108d N |
1326 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
1327 | int rcu_walk) | |
1da177e4 LT |
1328 | { |
1329 | if (IS_ROOT(dentry)) | |
1330 | return 1; | |
4eec952e TM |
1331 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1332 | return 0; | |
f2c77f4e TM |
1333 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1334 | return 0; | |
1335 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1cd9cb05 TM |
1336 | if (nfs_mapping_need_revalidate_inode(dir)) { |
1337 | if (rcu_walk) | |
1338 | return 0; | |
1339 | if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1340 | return 0; | |
1341 | } | |
f2c77f4e TM |
1342 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1343 | return 0; | |
1344 | return 1; | |
1da177e4 LT |
1345 | } |
1346 | ||
a12802ca TM |
1347 | /* |
1348 | * Use intent information to check whether or not we're going to do | |
1349 | * an O_EXCL create using this path component. | |
1350 | */ | |
fa3c56bb | 1351 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1352 | { |
1353 | if (NFS_PROTO(dir)->version == 2) | |
1354 | return 0; | |
fa3c56bb | 1355 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1356 | } |
1357 | ||
1d6757fb TM |
1358 | /* |
1359 | * Inode and filehandle revalidation for lookups. | |
1360 | * | |
1361 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1362 | * or if the intent information indicates that we're about to open this | |
1363 | * particular file and the "nocto" mount flag is not set. | |
1364 | * | |
1365 | */ | |
65a0c149 | 1366 | static |
fa3c56bb | 1367 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1368 | { |
1369 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1370 | int ret; |
1da177e4 | 1371 | |
36d43a43 | 1372 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1373 | return 0; |
47921921 TM |
1374 | |
1375 | if (flags & LOOKUP_OPEN) { | |
1376 | switch (inode->i_mode & S_IFMT) { | |
1377 | case S_IFREG: | |
1378 | /* A NFSv4 OPEN will revalidate later */ | |
1379 | if (server->caps & NFS_CAP_ATOMIC_OPEN) | |
1380 | goto out; | |
df561f66 | 1381 | fallthrough; |
47921921 TM |
1382 | case S_IFDIR: |
1383 | if (server->flags & NFS_MOUNT_NOCTO) | |
1384 | break; | |
1385 | /* NFS close-to-open cache consistency validation */ | |
1386 | goto out_force; | |
1387 | } | |
1388 | } | |
1389 | ||
facc3530 | 1390 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1391 | if (flags & LOOKUP_REVAL) |
facc3530 | 1392 | goto out_force; |
65a0c149 | 1393 | out: |
a61246c9 | 1394 | return (inode->i_nlink == 0) ? -ESTALE : 0; |
1da177e4 | 1395 | out_force: |
1fa1e384 N |
1396 | if (flags & LOOKUP_RCU) |
1397 | return -ECHILD; | |
65a0c149 TM |
1398 | ret = __nfs_revalidate_inode(server, inode); |
1399 | if (ret != 0) | |
1400 | return ret; | |
1401 | goto out; | |
1da177e4 LT |
1402 | } |
1403 | ||
cee083a7 TM |
1404 | static void nfs_mark_dir_for_revalidate(struct inode *inode) |
1405 | { | |
1406 | struct nfs_inode *nfsi = NFS_I(inode); | |
1407 | ||
1408 | spin_lock(&inode->i_lock); | |
1409 | nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; | |
1410 | spin_unlock(&inode->i_lock); | |
1411 | } | |
1412 | ||
1da177e4 LT |
1413 | /* |
1414 | * We judge how long we want to trust negative | |
1415 | * dentries by looking at the parent inode mtime. | |
1416 | * | |
1417 | * If parent mtime has changed, we revalidate, else we wait for a | |
1418 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1419 | * |
1420 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1421 | * suggesting a reval is needed. | |
9f6d44d4 TM |
1422 | * |
1423 | * Note that when creating a new file, or looking up a rename target, | |
1424 | * then it shouldn't be necessary to revalidate a negative dentry. | |
1da177e4 LT |
1425 | */ |
1426 | static inline | |
1427 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1428 | unsigned int flags) |
1da177e4 | 1429 | { |
9f6d44d4 | 1430 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
1da177e4 | 1431 | return 0; |
4eec952e TM |
1432 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1433 | return 1; | |
912a108d | 1434 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1435 | } |
1436 | ||
5ceb9d7f TM |
1437 | static int |
1438 | nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, | |
1439 | struct inode *inode, int error) | |
1440 | { | |
1441 | switch (error) { | |
1442 | case 1: | |
1443 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", | |
1444 | __func__, dentry); | |
1445 | return 1; | |
1446 | case 0: | |
5ceb9d7f TM |
1447 | if (inode && S_ISDIR(inode->i_mode)) { |
1448 | /* Purge readdir caches. */ | |
1449 | nfs_zap_caches(inode); | |
1450 | /* | |
1451 | * We can't d_drop the root of a disconnected tree: | |
1452 | * its d_hash is on the s_anon list and d_drop() would hide | |
1453 | * it from shrink_dcache_for_unmount(), leading to busy | |
1454 | * inodes on unmount and further oopses. | |
1455 | */ | |
1456 | if (IS_ROOT(dentry)) | |
1457 | return 1; | |
1458 | } | |
1459 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", | |
1460 | __func__, dentry); | |
1461 | return 0; | |
1462 | } | |
1463 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", | |
1464 | __func__, dentry, error); | |
1465 | return error; | |
1466 | } | |
1467 | ||
1468 | static int | |
1469 | nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, | |
1470 | unsigned int flags) | |
1471 | { | |
1472 | int ret = 1; | |
1473 | if (nfs_neg_need_reval(dir, dentry, flags)) { | |
1474 | if (flags & LOOKUP_RCU) | |
1475 | return -ECHILD; | |
1476 | ret = 0; | |
1477 | } | |
1478 | return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); | |
1479 | } | |
1480 | ||
1481 | static int | |
1482 | nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, | |
1483 | struct inode *inode) | |
1484 | { | |
1485 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1486 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1487 | } | |
1488 | ||
1489 | static int | |
1490 | nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, | |
1491 | struct inode *inode) | |
1492 | { | |
1493 | struct nfs_fh *fhandle; | |
1494 | struct nfs_fattr *fattr; | |
1495 | struct nfs4_label *label; | |
a1147b82 | 1496 | unsigned long dir_verifier; |
5ceb9d7f TM |
1497 | int ret; |
1498 | ||
1499 | ret = -ENOMEM; | |
1500 | fhandle = nfs_alloc_fhandle(); | |
1501 | fattr = nfs_alloc_fattr(); | |
1502 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); | |
1503 | if (fhandle == NULL || fattr == NULL || IS_ERR(label)) | |
1504 | goto out; | |
1505 | ||
a1147b82 | 1506 | dir_verifier = nfs_save_change_attribute(dir); |
f7b37b8b | 1507 | ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); |
5ceb9d7f | 1508 | if (ret < 0) { |
f7b37b8b TM |
1509 | switch (ret) { |
1510 | case -ESTALE: | |
1511 | case -ENOENT: | |
5ceb9d7f | 1512 | ret = 0; |
f7b37b8b TM |
1513 | break; |
1514 | case -ETIMEDOUT: | |
1515 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) | |
1516 | ret = 1; | |
1517 | } | |
5ceb9d7f TM |
1518 | goto out; |
1519 | } | |
1520 | ret = 0; | |
1521 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) | |
1522 | goto out; | |
1523 | if (nfs_refresh_inode(inode, fattr) < 0) | |
1524 | goto out; | |
1525 | ||
1526 | nfs_setsecurity(inode, fattr, label); | |
a1147b82 | 1527 | nfs_set_verifier(dentry, dir_verifier); |
5ceb9d7f TM |
1528 | |
1529 | /* set a readdirplus hint that we had a cache miss */ | |
1530 | nfs_force_use_readdirplus(dir); | |
1531 | ret = 1; | |
1532 | out: | |
1533 | nfs_free_fattr(fattr); | |
1534 | nfs_free_fhandle(fhandle); | |
1535 | nfs4_label_free(label); | |
cee083a7 TM |
1536 | |
1537 | /* | |
1538 | * If the lookup failed despite the dentry change attribute being | |
1539 | * a match, then we should revalidate the directory cache. | |
1540 | */ | |
1541 | if (!ret && nfs_verify_change_attribute(dir, dentry->d_time)) | |
1542 | nfs_mark_dir_for_revalidate(dir); | |
5ceb9d7f TM |
1543 | return nfs_lookup_revalidate_done(dir, dentry, inode, ret); |
1544 | } | |
1545 | ||
1da177e4 LT |
1546 | /* |
1547 | * This is called every time the dcache has a lookup hit, | |
1548 | * and we should check whether we can really trust that | |
1549 | * lookup. | |
1550 | * | |
1551 | * NOTE! The hit can be a negative hit too, don't assume | |
1552 | * we have an inode! | |
1553 | * | |
1554 | * If the parent directory is seen to have changed, we throw out the | |
1555 | * cached dentry and do a new lookup. | |
1556 | */ | |
5ceb9d7f TM |
1557 | static int |
1558 | nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
1559 | unsigned int flags) | |
1da177e4 | 1560 | { |
1da177e4 | 1561 | struct inode *inode; |
1da177e4 | 1562 | int error; |
1da177e4 | 1563 | |
91d5b470 | 1564 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
2b0143b5 | 1565 | inode = d_inode(dentry); |
1da177e4 | 1566 | |
5ceb9d7f TM |
1567 | if (!inode) |
1568 | return nfs_lookup_revalidate_negative(dir, dentry, flags); | |
1da177e4 LT |
1569 | |
1570 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1571 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1572 | __func__, dentry); | |
1da177e4 LT |
1573 | goto out_bad; |
1574 | } | |
1575 | ||
efeda80d | 1576 | if (nfs_verifier_is_delegated(dentry)) |
5ceb9d7f | 1577 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); |
15860ab1 | 1578 | |
1da177e4 | 1579 | /* Force a full look up iff the parent directory has changed */ |
73dd684a | 1580 | if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && |
912a108d | 1581 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { |
cc89684c N |
1582 | error = nfs_lookup_verify_inode(inode, flags); |
1583 | if (error) { | |
cc89684c | 1584 | if (error == -ESTALE) |
cee083a7 | 1585 | nfs_mark_dir_for_revalidate(dir); |
5ceb9d7f | 1586 | goto out_bad; |
1fa1e384 | 1587 | } |
63519fbc | 1588 | nfs_advise_use_readdirplus(dir); |
1da177e4 LT |
1589 | goto out_valid; |
1590 | } | |
1591 | ||
912a108d N |
1592 | if (flags & LOOKUP_RCU) |
1593 | return -ECHILD; | |
1594 | ||
1da177e4 LT |
1595 | if (NFS_STALE(inode)) |
1596 | goto out_bad; | |
1597 | ||
6e0d0be7 | 1598 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
5ceb9d7f | 1599 | error = nfs_lookup_revalidate_dentry(dir, dentry, inode); |
6e0d0be7 | 1600 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
5ceb9d7f TM |
1601 | return error; |
1602 | out_valid: | |
1603 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1604 | out_bad: | |
1605 | if (flags & LOOKUP_RCU) | |
1606 | return -ECHILD; | |
1607 | return nfs_lookup_revalidate_done(dir, dentry, inode, 0); | |
1608 | } | |
14c43f76 | 1609 | |
5ceb9d7f | 1610 | static int |
c7944ebb TM |
1611 | __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, |
1612 | int (*reval)(struct inode *, struct dentry *, unsigned int)) | |
5ceb9d7f TM |
1613 | { |
1614 | struct dentry *parent; | |
1615 | struct inode *dir; | |
1616 | int ret; | |
63519fbc | 1617 | |
d51ac1a8 | 1618 | if (flags & LOOKUP_RCU) { |
5ceb9d7f TM |
1619 | parent = READ_ONCE(dentry->d_parent); |
1620 | dir = d_inode_rcu(parent); | |
1621 | if (!dir) | |
1622 | return -ECHILD; | |
c7944ebb | 1623 | ret = reval(dir, dentry, flags); |
6aa7de05 | 1624 | if (parent != READ_ONCE(dentry->d_parent)) |
d51ac1a8 | 1625 | return -ECHILD; |
5ceb9d7f TM |
1626 | } else { |
1627 | parent = dget_parent(dentry); | |
c7944ebb | 1628 | ret = reval(d_inode(parent), dentry, flags); |
d51ac1a8 | 1629 | dput(parent); |
1da177e4 | 1630 | } |
5ceb9d7f | 1631 | return ret; |
1da177e4 LT |
1632 | } |
1633 | ||
c7944ebb TM |
1634 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1635 | { | |
1636 | return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); | |
1637 | } | |
1638 | ||
ecf3d1f1 | 1639 | /* |
2b0143b5 | 1640 | * A weaker form of d_revalidate for revalidating just the d_inode(dentry) |
ecf3d1f1 JL |
1641 | * when we don't really care about the dentry name. This is called when a |
1642 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1643 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1644 | * | |
1645 | * In this situation, we just want to verify that the inode itself is OK | |
1646 | * since the dentry might have changed on the server. | |
1647 | */ | |
1648 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1649 | { | |
2b0143b5 | 1650 | struct inode *inode = d_inode(dentry); |
9cdd1d3f | 1651 | int error = 0; |
ecf3d1f1 JL |
1652 | |
1653 | /* | |
1654 | * I believe we can only get a negative dentry here in the case of a | |
1655 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1656 | * eventually need to do something more here. | |
1657 | */ | |
1658 | if (!inode) { | |
6de1472f AV |
1659 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1660 | __func__, dentry); | |
ecf3d1f1 JL |
1661 | return 1; |
1662 | } | |
1663 | ||
1664 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1665 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1666 | __func__, dentry); | |
ecf3d1f1 JL |
1667 | return 0; |
1668 | } | |
1669 | ||
b688741c | 1670 | error = nfs_lookup_verify_inode(inode, flags); |
ecf3d1f1 JL |
1671 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", |
1672 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1673 | return !error; | |
1674 | } | |
1675 | ||
1da177e4 LT |
1676 | /* |
1677 | * This is called from dput() when d_count is going to 0. | |
1678 | */ | |
fe15ce44 | 1679 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1680 | { |
6de1472f AV |
1681 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1682 | dentry, dentry->d_flags); | |
1da177e4 | 1683 | |
77f11192 | 1684 | /* Unhash any dentry with a stale inode */ |
2b0143b5 | 1685 | if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) |
77f11192 TM |
1686 | return 1; |
1687 | ||
1da177e4 LT |
1688 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1689 | /* Unhash it, so that ->d_iput() would be called */ | |
1690 | return 1; | |
1691 | } | |
1751e8a6 | 1692 | if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { |
1da177e4 LT |
1693 | /* Unhash it, so that ancestors of killed async unlink |
1694 | * files will be cleaned up during umount */ | |
1695 | return 1; | |
1696 | } | |
1697 | return 0; | |
1698 | ||
1699 | } | |
1700 | ||
1f018458 | 1701 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1702 | static void nfs_drop_nlink(struct inode *inode) |
1703 | { | |
1704 | spin_lock(&inode->i_lock); | |
1f018458 | 1705 | /* drop the inode if we're reasonably sure this is the last link */ |
59a707b0 TM |
1706 | if (inode->i_nlink > 0) |
1707 | drop_nlink(inode); | |
1708 | NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
16e14375 TM |
1709 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE |
1710 | | NFS_INO_INVALID_CTIME | |
59a707b0 TM |
1711 | | NFS_INO_INVALID_OTHER |
1712 | | NFS_INO_REVAL_FORCED; | |
1b83d707 TM |
1713 | spin_unlock(&inode->i_lock); |
1714 | } | |
1715 | ||
1da177e4 LT |
1716 | /* |
1717 | * Called when the dentry loses inode. | |
1718 | * We use it to clean up silly-renamed files. | |
1719 | */ | |
1720 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1721 | { | |
83672d39 NB |
1722 | if (S_ISDIR(inode->i_mode)) |
1723 | /* drop any readdir cache as it could easily be old */ | |
1724 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1725 | ||
1da177e4 | 1726 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1727 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1728 | nfs_drop_nlink(inode); |
1da177e4 | 1729 | } |
1da177e4 LT |
1730 | iput(inode); |
1731 | } | |
1732 | ||
b1942c5f AV |
1733 | static void nfs_d_release(struct dentry *dentry) |
1734 | { | |
1735 | /* free cached devname value, if it survived that far */ | |
1736 | if (unlikely(dentry->d_fsdata)) { | |
1737 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1738 | WARN_ON(1); | |
1739 | else | |
1740 | kfree(dentry->d_fsdata); | |
1741 | } | |
1742 | } | |
1743 | ||
f786aa90 | 1744 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1745 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1746 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1747 | .d_delete = nfs_dentry_delete, |
1748 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1749 | .d_automount = nfs_d_automount, |
b1942c5f | 1750 | .d_release = nfs_d_release, |
1da177e4 | 1751 | }; |
ddda8e0a | 1752 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1753 | |
597d9289 | 1754 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1755 | { |
1756 | struct dentry *res; | |
1757 | struct inode *inode = NULL; | |
e1fb4d05 TM |
1758 | struct nfs_fh *fhandle = NULL; |
1759 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1760 | struct nfs4_label *label = NULL; |
a1147b82 | 1761 | unsigned long dir_verifier; |
1da177e4 | 1762 | int error; |
1da177e4 | 1763 | |
6de1472f | 1764 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1765 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 | 1766 | |
130f9ab7 AV |
1767 | if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) |
1768 | return ERR_PTR(-ENAMETOOLONG); | |
1da177e4 | 1769 | |
fd684071 TM |
1770 | /* |
1771 | * If we're doing an exclusive create, optimize away the lookup | |
1772 | * but don't hash the dentry. | |
1773 | */ | |
9f6d44d4 | 1774 | if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) |
130f9ab7 | 1775 | return NULL; |
1da177e4 | 1776 | |
e1fb4d05 TM |
1777 | res = ERR_PTR(-ENOMEM); |
1778 | fhandle = nfs_alloc_fhandle(); | |
1779 | fattr = nfs_alloc_fattr(); | |
1780 | if (fhandle == NULL || fattr == NULL) | |
1781 | goto out; | |
1782 | ||
14c43f76 DQ |
1783 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1784 | if (IS_ERR(label)) | |
1785 | goto out; | |
1786 | ||
a1147b82 | 1787 | dir_verifier = nfs_save_change_attribute(dir); |
6e0d0be7 | 1788 | trace_nfs_lookup_enter(dir, dentry, flags); |
f7b37b8b | 1789 | error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); |
1da177e4 LT |
1790 | if (error == -ENOENT) |
1791 | goto no_entry; | |
1792 | if (error < 0) { | |
1793 | res = ERR_PTR(error); | |
bf130914 | 1794 | goto out_label; |
1da177e4 | 1795 | } |
1775fd3e | 1796 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1797 | res = ERR_CAST(inode); |
03f28e3a | 1798 | if (IS_ERR(res)) |
bf130914 | 1799 | goto out_label; |
54ceac45 | 1800 | |
63519fbc TM |
1801 | /* Notify readdir to use READDIRPLUS */ |
1802 | nfs_force_use_readdirplus(dir); | |
d69ee9b8 | 1803 | |
1da177e4 | 1804 | no_entry: |
41d28bca | 1805 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1806 | if (res != NULL) { |
1807 | if (IS_ERR(res)) | |
bf130914 | 1808 | goto out_label; |
1da177e4 | 1809 | dentry = res; |
9eaef27b | 1810 | } |
a1147b82 | 1811 | nfs_set_verifier(dentry, dir_verifier); |
bf130914 | 1812 | out_label: |
6e0d0be7 | 1813 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1814 | nfs4_label_free(label); |
1da177e4 | 1815 | out: |
e1fb4d05 TM |
1816 | nfs_free_fattr(fattr); |
1817 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1818 | return res; |
1819 | } | |
ddda8e0a | 1820 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1821 | |
89d77c8f | 1822 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1823 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1824 | |
f786aa90 | 1825 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1826 | .d_revalidate = nfs4_lookup_revalidate, |
b688741c | 1827 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1828 | .d_delete = nfs_dentry_delete, |
1829 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1830 | .d_automount = nfs_d_automount, |
b1942c5f | 1831 | .d_release = nfs_d_release, |
1da177e4 | 1832 | }; |
89d77c8f | 1833 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1834 | |
8a5e929d AV |
1835 | static fmode_t flags_to_mode(int flags) |
1836 | { | |
1837 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1838 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1839 | res |= FMODE_READ; | |
1840 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1841 | res |= FMODE_WRITE; | |
1842 | return res; | |
1843 | } | |
1844 | ||
532d4def | 1845 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) |
cd9a1c0e | 1846 | { |
532d4def | 1847 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); |
cd9a1c0e TM |
1848 | } |
1849 | ||
1850 | static int do_open(struct inode *inode, struct file *filp) | |
1851 | { | |
f1fe29b4 | 1852 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1853 | return 0; |
1854 | } | |
1855 | ||
d9585277 AV |
1856 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1857 | struct dentry *dentry, | |
b452a458 | 1858 | struct file *file, unsigned open_flags) |
cd9a1c0e | 1859 | { |
0dd2b474 MS |
1860 | int err; |
1861 | ||
be12af3e | 1862 | err = finish_open(file, dentry, do_open); |
30d90494 | 1863 | if (err) |
d9585277 | 1864 | goto out; |
eaa2b82c N |
1865 | if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) |
1866 | nfs_file_set_open_context(file, ctx); | |
1867 | else | |
9821421a | 1868 | err = -EOPENSTALE; |
cd9a1c0e | 1869 | out: |
d9585277 | 1870 | return err; |
cd9a1c0e TM |
1871 | } |
1872 | ||
73a79706 BS |
1873 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1874 | struct file *file, unsigned open_flags, | |
44907d79 | 1875 | umode_t mode) |
1da177e4 | 1876 | { |
c94c0953 | 1877 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
cd9a1c0e | 1878 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1879 | struct dentry *res; |
1880 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1881 | struct inode *inode; |
1472b83e | 1882 | unsigned int lookup_flags = 0; |
c94c0953 | 1883 | bool switched = false; |
73a09dd9 | 1884 | int created = 0; |
898f635c | 1885 | int err; |
1da177e4 | 1886 | |
0dd2b474 | 1887 | /* Expect a negative dentry */ |
2b0143b5 | 1888 | BUG_ON(d_inode(dentry)); |
0dd2b474 | 1889 | |
1e8968c5 | 1890 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1891 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1892 | |
9597c13b JL |
1893 | err = nfs_check_flags(open_flags); |
1894 | if (err) | |
1895 | return err; | |
1896 | ||
0dd2b474 MS |
1897 | /* NFS only supports OPEN on regular files */ |
1898 | if ((open_flags & O_DIRECTORY)) { | |
00699ad8 | 1899 | if (!d_in_lookup(dentry)) { |
0dd2b474 MS |
1900 | /* |
1901 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1902 | * revalidated and is fine, no need to perform lookup | |
1903 | * again | |
1904 | */ | |
d9585277 | 1905 | return -ENOENT; |
0dd2b474 | 1906 | } |
1472b83e | 1907 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1908 | goto no_open; |
02a913a7 | 1909 | } |
1da177e4 | 1910 | |
0dd2b474 | 1911 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1912 | return -ENAMETOOLONG; |
cd9a1c0e | 1913 | |
0dd2b474 | 1914 | if (open_flags & O_CREAT) { |
dff25ddb AG |
1915 | struct nfs_server *server = NFS_SERVER(dir); |
1916 | ||
1917 | if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) | |
1918 | mode &= ~current_umask(); | |
1919 | ||
536e43d1 | 1920 | attr.ia_valid |= ATTR_MODE; |
dff25ddb | 1921 | attr.ia_mode = mode; |
0dd2b474 | 1922 | } |
536e43d1 TM |
1923 | if (open_flags & O_TRUNC) { |
1924 | attr.ia_valid |= ATTR_SIZE; | |
1925 | attr.ia_size = 0; | |
cd9a1c0e TM |
1926 | } |
1927 | ||
c94c0953 AV |
1928 | if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { |
1929 | d_drop(dentry); | |
1930 | switched = true; | |
1931 | dentry = d_alloc_parallel(dentry->d_parent, | |
1932 | &dentry->d_name, &wq); | |
1933 | if (IS_ERR(dentry)) | |
1934 | return PTR_ERR(dentry); | |
1935 | if (unlikely(!d_in_lookup(dentry))) | |
1936 | return finish_no_open(file, dentry); | |
1937 | } | |
1938 | ||
532d4def | 1939 | ctx = create_nfs_open_context(dentry, open_flags, file); |
0dd2b474 MS |
1940 | err = PTR_ERR(ctx); |
1941 | if (IS_ERR(ctx)) | |
d9585277 | 1942 | goto out; |
0dd2b474 | 1943 | |
6e0d0be7 | 1944 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
73a09dd9 AV |
1945 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); |
1946 | if (created) | |
1947 | file->f_mode |= FMODE_CREATED; | |
f46e0bd3 | 1948 | if (IS_ERR(inode)) { |
0dd2b474 | 1949 | err = PTR_ERR(inode); |
6e0d0be7 | 1950 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1951 | put_nfs_open_context(ctx); |
d20cb71d | 1952 | d_drop(dentry); |
0dd2b474 MS |
1953 | switch (err) { |
1954 | case -ENOENT: | |
774d9513 | 1955 | d_splice_alias(NULL, dentry); |
809fd143 | 1956 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1957 | break; |
1958 | case -EISDIR: | |
1959 | case -ENOTDIR: | |
1960 | goto no_open; | |
1961 | case -ELOOP: | |
1962 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1963 | goto no_open; |
0dd2b474 | 1964 | break; |
1da177e4 | 1965 | /* case -EINVAL: */ |
0dd2b474 MS |
1966 | default: |
1967 | break; | |
1da177e4 | 1968 | } |
d9585277 | 1969 | goto out; |
cd9a1c0e | 1970 | } |
0dd2b474 | 1971 | |
b452a458 | 1972 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); |
6e0d0be7 | 1973 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1974 | put_nfs_open_context(ctx); |
d9585277 | 1975 | out: |
c94c0953 AV |
1976 | if (unlikely(switched)) { |
1977 | d_lookup_done(dentry); | |
1978 | dput(dentry); | |
1979 | } | |
d9585277 | 1980 | return err; |
0dd2b474 | 1981 | |
1da177e4 | 1982 | no_open: |
1472b83e | 1983 | res = nfs_lookup(dir, dentry, lookup_flags); |
c94c0953 AV |
1984 | if (switched) { |
1985 | d_lookup_done(dentry); | |
1986 | if (!res) | |
1987 | res = dentry; | |
1988 | else | |
1989 | dput(dentry); | |
1990 | } | |
0dd2b474 | 1991 | if (IS_ERR(res)) |
c94c0953 | 1992 | return PTR_ERR(res); |
e45198a6 | 1993 | return finish_no_open(file, res); |
1da177e4 | 1994 | } |
89d77c8f | 1995 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1996 | |
c7944ebb TM |
1997 | static int |
1998 | nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
1999 | unsigned int flags) | |
1da177e4 | 2000 | { |
657e94b6 | 2001 | struct inode *inode; |
1da177e4 | 2002 | |
fa3c56bb | 2003 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
c7944ebb | 2004 | goto full_reval; |
eda72afb | 2005 | if (d_mountpoint(dentry)) |
c7944ebb | 2006 | goto full_reval; |
2b484297 | 2007 | |
2b0143b5 | 2008 | inode = d_inode(dentry); |
2b484297 | 2009 | |
1da177e4 LT |
2010 | /* We can't create new files in nfs_open_revalidate(), so we |
2011 | * optimize away revalidation of negative dentries. | |
2012 | */ | |
c7944ebb TM |
2013 | if (inode == NULL) |
2014 | goto full_reval; | |
2015 | ||
efeda80d | 2016 | if (nfs_verifier_is_delegated(dentry)) |
c7944ebb | 2017 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); |
216d5d06 | 2018 | |
1da177e4 LT |
2019 | /* NFS only supports OPEN on regular files */ |
2020 | if (!S_ISREG(inode->i_mode)) | |
c7944ebb TM |
2021 | goto full_reval; |
2022 | ||
1da177e4 | 2023 | /* We cannot do exclusive creation on a positive dentry */ |
c7944ebb TM |
2024 | if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) |
2025 | goto reval_dentry; | |
2026 | ||
2027 | /* Check if the directory changed */ | |
2028 | if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) | |
2029 | goto reval_dentry; | |
1da177e4 | 2030 | |
0ef97dcf | 2031 | /* Let f_op->open() actually open (and revalidate) the file */ |
c7944ebb TM |
2032 | return 1; |
2033 | reval_dentry: | |
2034 | if (flags & LOOKUP_RCU) | |
2035 | return -ECHILD; | |
42f72cf3 | 2036 | return nfs_lookup_revalidate_dentry(dir, dentry, inode); |
536e43d1 | 2037 | |
c7944ebb TM |
2038 | full_reval: |
2039 | return nfs_do_lookup_revalidate(dir, dentry, flags); | |
2040 | } | |
535918f1 | 2041 | |
c7944ebb TM |
2042 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
2043 | { | |
2044 | return __nfs_lookup_revalidate(dentry, flags, | |
2045 | nfs4_do_lookup_revalidate); | |
c0204fd2 TM |
2046 | } |
2047 | ||
1da177e4 LT |
2048 | #endif /* CONFIG_NFSV4 */ |
2049 | ||
406cd915 BC |
2050 | struct dentry * |
2051 | nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
2052 | struct nfs_fattr *fattr, |
2053 | struct nfs4_label *label) | |
1da177e4 | 2054 | { |
fab728e1 | 2055 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 2056 | struct inode *dir = d_inode(parent); |
1da177e4 | 2057 | struct inode *inode; |
b0c6108e | 2058 | struct dentry *d; |
406cd915 | 2059 | int error; |
1da177e4 | 2060 | |
fab728e1 TM |
2061 | d_drop(dentry); |
2062 | ||
1da177e4 | 2063 | if (fhandle->size == 0) { |
f7b37b8b | 2064 | error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, NULL); |
1da177e4 | 2065 | if (error) |
fab728e1 | 2066 | goto out_error; |
1da177e4 | 2067 | } |
5724ab37 | 2068 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
2069 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
2070 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
a841b54d TM |
2071 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, |
2072 | fattr, NULL, NULL); | |
1da177e4 | 2073 | if (error < 0) |
fab728e1 | 2074 | goto out_error; |
1da177e4 | 2075 | } |
1775fd3e | 2076 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
b0c6108e | 2077 | d = d_splice_alias(inode, dentry); |
fab728e1 TM |
2078 | out: |
2079 | dput(parent); | |
406cd915 | 2080 | return d; |
fab728e1 | 2081 | out_error: |
406cd915 BC |
2082 | d = ERR_PTR(error); |
2083 | goto out; | |
2084 | } | |
2085 | EXPORT_SYMBOL_GPL(nfs_add_or_obtain); | |
2086 | ||
2087 | /* | |
2088 | * Code common to create, mkdir, and mknod. | |
2089 | */ | |
2090 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
2091 | struct nfs_fattr *fattr, | |
2092 | struct nfs4_label *label) | |
2093 | { | |
2094 | struct dentry *d; | |
2095 | ||
2096 | d = nfs_add_or_obtain(dentry, fhandle, fattr, label); | |
2097 | if (IS_ERR(d)) | |
2098 | return PTR_ERR(d); | |
2099 | ||
2100 | /* Callers don't care */ | |
2101 | dput(d); | |
2102 | return 0; | |
1da177e4 | 2103 | } |
ddda8e0a | 2104 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
2105 | |
2106 | /* | |
2107 | * Following a failed create operation, we drop the dentry rather | |
2108 | * than retain a negative dentry. This avoids a problem in the event | |
2109 | * that the operation succeeded on the server, but an error in the | |
2110 | * reply path made it appear to have failed. | |
2111 | */ | |
597d9289 | 2112 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 2113 | umode_t mode, bool excl) |
1da177e4 LT |
2114 | { |
2115 | struct iattr attr; | |
ebfc3b49 | 2116 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 2117 | int error; |
1da177e4 | 2118 | |
1e8968c5 | 2119 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 2120 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
2121 | |
2122 | attr.ia_mode = mode; | |
2123 | attr.ia_valid = ATTR_MODE; | |
2124 | ||
8b0ad3d4 | 2125 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 2126 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 2127 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
2128 | if (error != 0) |
2129 | goto out_err; | |
1da177e4 LT |
2130 | return 0; |
2131 | out_err: | |
1da177e4 LT |
2132 | d_drop(dentry); |
2133 | return error; | |
2134 | } | |
ddda8e0a | 2135 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
2136 | |
2137 | /* | |
2138 | * See comments for nfs_proc_create regarding failed operations. | |
2139 | */ | |
597d9289 | 2140 | int |
1a67aafb | 2141 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
2142 | { |
2143 | struct iattr attr; | |
2144 | int status; | |
2145 | ||
1e8968c5 | 2146 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 2147 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 2148 | |
1da177e4 LT |
2149 | attr.ia_mode = mode; |
2150 | attr.ia_valid = ATTR_MODE; | |
2151 | ||
1ca42382 | 2152 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 2153 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 2154 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
2155 | if (status != 0) |
2156 | goto out_err; | |
1da177e4 LT |
2157 | return 0; |
2158 | out_err: | |
1da177e4 LT |
2159 | d_drop(dentry); |
2160 | return status; | |
2161 | } | |
ddda8e0a | 2162 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
2163 | |
2164 | /* | |
2165 | * See comments for nfs_proc_create regarding failed operations. | |
2166 | */ | |
597d9289 | 2167 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
2168 | { |
2169 | struct iattr attr; | |
2170 | int error; | |
2171 | ||
1e8968c5 | 2172 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 2173 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
2174 | |
2175 | attr.ia_valid = ATTR_MODE; | |
2176 | attr.ia_mode = mode | S_IFDIR; | |
2177 | ||
1ca42382 | 2178 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 2179 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 2180 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
2181 | if (error != 0) |
2182 | goto out_err; | |
1da177e4 LT |
2183 | return 0; |
2184 | out_err: | |
2185 | d_drop(dentry); | |
1da177e4 LT |
2186 | return error; |
2187 | } | |
ddda8e0a | 2188 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 2189 | |
d45b9d8b TM |
2190 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
2191 | { | |
dc3f4198 | 2192 | if (simple_positive(dentry)) |
d45b9d8b TM |
2193 | d_delete(dentry); |
2194 | } | |
2195 | ||
597d9289 | 2196 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
2197 | { |
2198 | int error; | |
2199 | ||
1e8968c5 | 2200 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 2201 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 2202 | |
1ca42382 | 2203 | trace_nfs_rmdir_enter(dir, dentry); |
2b0143b5 | 2204 | if (d_really_is_positive(dentry)) { |
884be175 | 2205 | down_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
2206 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
2207 | /* Ensure the VFS deletes this inode */ | |
2208 | switch (error) { | |
2209 | case 0: | |
2b0143b5 | 2210 | clear_nlink(d_inode(dentry)); |
ba6c0592 TM |
2211 | break; |
2212 | case -ENOENT: | |
2213 | nfs_dentry_handle_enoent(dentry); | |
2214 | } | |
884be175 | 2215 | up_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
2216 | } else |
2217 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 2218 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
2219 | |
2220 | return error; | |
2221 | } | |
ddda8e0a | 2222 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 2223 | |
1da177e4 LT |
2224 | /* |
2225 | * Remove a file after making sure there are no pending writes, | |
2226 | * and after checking that the file has only one user. | |
2227 | * | |
2228 | * We invalidate the attribute cache and free the inode prior to the operation | |
2229 | * to avoid possible races if the server reuses the inode. | |
2230 | */ | |
2231 | static int nfs_safe_remove(struct dentry *dentry) | |
2232 | { | |
2b0143b5 DH |
2233 | struct inode *dir = d_inode(dentry->d_parent); |
2234 | struct inode *inode = d_inode(dentry); | |
1da177e4 LT |
2235 | int error = -EBUSY; |
2236 | ||
6de1472f | 2237 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
2238 | |
2239 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
2240 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
2241 | error = 0; | |
2242 | goto out; | |
2243 | } | |
2244 | ||
1ca42382 | 2245 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 2246 | if (inode != NULL) { |
912678db | 2247 | error = NFS_PROTO(dir)->remove(dir, dentry); |
1da177e4 | 2248 | if (error == 0) |
1b83d707 | 2249 | nfs_drop_nlink(inode); |
1da177e4 | 2250 | } else |
912678db | 2251 | error = NFS_PROTO(dir)->remove(dir, dentry); |
d45b9d8b TM |
2252 | if (error == -ENOENT) |
2253 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 2254 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
2255 | out: |
2256 | return error; | |
2257 | } | |
2258 | ||
2259 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
2260 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
2261 | * | |
2262 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
2263 | */ | |
597d9289 | 2264 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
2265 | { |
2266 | int error; | |
2267 | int need_rehash = 0; | |
2268 | ||
1e8968c5 | 2269 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 2270 | dir->i_ino, dentry); |
1da177e4 | 2271 | |
1ca42382 | 2272 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 2273 | spin_lock(&dentry->d_lock); |
84d08fa8 | 2274 | if (d_count(dentry) > 1) { |
1da177e4 | 2275 | spin_unlock(&dentry->d_lock); |
ccfeb506 | 2276 | /* Start asynchronous writeout of the inode */ |
2b0143b5 | 2277 | write_inode_now(d_inode(dentry), 0); |
1da177e4 | 2278 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 2279 | goto out; |
1da177e4 LT |
2280 | } |
2281 | if (!d_unhashed(dentry)) { | |
2282 | __d_drop(dentry); | |
2283 | need_rehash = 1; | |
2284 | } | |
2285 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 2286 | error = nfs_safe_remove(dentry); |
d45b9d8b | 2287 | if (!error || error == -ENOENT) { |
1da177e4 LT |
2288 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
2289 | } else if (need_rehash) | |
2290 | d_rehash(dentry); | |
1ca42382 TM |
2291 | out: |
2292 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
2293 | return error; |
2294 | } | |
ddda8e0a | 2295 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 2296 | |
873101b3 CL |
2297 | /* |
2298 | * To create a symbolic link, most file systems instantiate a new inode, | |
2299 | * add a page to it containing the path, then write it out to the disk | |
2300 | * using prepare_write/commit_write. | |
2301 | * | |
2302 | * Unfortunately the NFS client can't create the in-core inode first | |
2303 | * because it needs a file handle to create an in-core inode (see | |
2304 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
2305 | * symlink request has completed on the server. | |
2306 | * | |
2307 | * So instead we allocate a raw page, copy the symname into it, then do | |
2308 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
2309 | * now have a new file handle and can instantiate an in-core NFS inode | |
2310 | * and move the raw page into its mapping. | |
2311 | */ | |
597d9289 | 2312 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 2313 | { |
873101b3 CL |
2314 | struct page *page; |
2315 | char *kaddr; | |
1da177e4 | 2316 | struct iattr attr; |
873101b3 | 2317 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
2318 | int error; |
2319 | ||
1e8968c5 | 2320 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 2321 | dir->i_ino, dentry, symname); |
1da177e4 | 2322 | |
873101b3 CL |
2323 | if (pathlen > PAGE_SIZE) |
2324 | return -ENAMETOOLONG; | |
1da177e4 | 2325 | |
873101b3 CL |
2326 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
2327 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 2328 | |
e8ecde25 | 2329 | page = alloc_page(GFP_USER); |
76566991 | 2330 | if (!page) |
873101b3 | 2331 | return -ENOMEM; |
873101b3 | 2332 | |
e8ecde25 | 2333 | kaddr = page_address(page); |
873101b3 CL |
2334 | memcpy(kaddr, symname, pathlen); |
2335 | if (pathlen < PAGE_SIZE) | |
2336 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
873101b3 | 2337 | |
1ca42382 | 2338 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 2339 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 2340 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 2341 | if (error != 0) { |
1e8968c5 | 2342 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 2343 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 2344 | dentry, symname, error); |
1da177e4 | 2345 | d_drop(dentry); |
873101b3 | 2346 | __free_page(page); |
873101b3 CL |
2347 | return error; |
2348 | } | |
2349 | ||
2350 | /* | |
2351 | * No big deal if we can't add this page to the page cache here. | |
2352 | * READLINK will get the missing page from the server if needed. | |
2353 | */ | |
2b0143b5 | 2354 | if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, |
873101b3 | 2355 | GFP_KERNEL)) { |
873101b3 CL |
2356 | SetPageUptodate(page); |
2357 | unlock_page(page); | |
a0b54add RA |
2358 | /* |
2359 | * add_to_page_cache_lru() grabs an extra page refcount. | |
2360 | * Drop it here to avoid leaking this page later. | |
2361 | */ | |
09cbfeaf | 2362 | put_page(page); |
873101b3 CL |
2363 | } else |
2364 | __free_page(page); | |
2365 | ||
873101b3 | 2366 | return 0; |
1da177e4 | 2367 | } |
ddda8e0a | 2368 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 2369 | |
597d9289 | 2370 | int |
1da177e4 LT |
2371 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
2372 | { | |
2b0143b5 | 2373 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
2374 | int error; |
2375 | ||
6de1472f AV |
2376 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
2377 | old_dentry, dentry); | |
1da177e4 | 2378 | |
1fd1085b | 2379 | trace_nfs_link_enter(inode, dir, dentry); |
9697d234 | 2380 | d_drop(dentry); |
1da177e4 | 2381 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 2382 | if (error == 0) { |
7de9c6ee | 2383 | ihold(inode); |
9697d234 | 2384 | d_add(dentry, inode); |
cf809556 | 2385 | } |
1fd1085b | 2386 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
2387 | return error; |
2388 | } | |
ddda8e0a | 2389 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
2390 | |
2391 | /* | |
2392 | * RENAME | |
2393 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
2394 | * different file handle for the same inode after a rename (e.g. when | |
2395 | * moving to a different directory). A fail-safe method to do so would | |
2396 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
2397 | * rename the old file using the sillyrename stuff. This way, the original | |
2398 | * file in old_dir will go away when the last process iput()s the inode. | |
2399 | * | |
2400 | * FIXED. | |
2401 | * | |
2402 | * It actually works quite well. One needs to have the possibility for | |
2403 | * at least one ".nfs..." file in each directory the file ever gets | |
2404 | * moved or linked to which happens automagically with the new | |
2405 | * implementation that only depends on the dcache stuff instead of | |
2406 | * using the inode layer | |
2407 | * | |
2408 | * Unfortunately, things are a little more complicated than indicated | |
2409 | * above. For a cross-directory move, we want to make sure we can get | |
2410 | * rid of the old inode after the operation. This means there must be | |
2411 | * no pending writes (if it's a file), and the use count must be 1. | |
2412 | * If these conditions are met, we can drop the dentries before doing | |
2413 | * the rename. | |
2414 | */ | |
597d9289 | 2415 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1cd66c93 MS |
2416 | struct inode *new_dir, struct dentry *new_dentry, |
2417 | unsigned int flags) | |
1da177e4 | 2418 | { |
2b0143b5 DH |
2419 | struct inode *old_inode = d_inode(old_dentry); |
2420 | struct inode *new_inode = d_inode(new_dentry); | |
d9f29500 | 2421 | struct dentry *dentry = NULL, *rehash = NULL; |
80a491fd | 2422 | struct rpc_task *task; |
1da177e4 LT |
2423 | int error = -EBUSY; |
2424 | ||
1cd66c93 MS |
2425 | if (flags) |
2426 | return -EINVAL; | |
2427 | ||
6de1472f AV |
2428 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
2429 | old_dentry, new_dentry, | |
84d08fa8 | 2430 | d_count(new_dentry)); |
1da177e4 | 2431 | |
70ded201 | 2432 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 2433 | /* |
28f79a1a MS |
2434 | * For non-directories, check whether the target is busy and if so, |
2435 | * make a copy of the dentry and then do a silly-rename. If the | |
2436 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2437 | * the new target. | |
1da177e4 | 2438 | */ |
27226104 MS |
2439 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2440 | /* | |
2441 | * To prevent any new references to the target during the | |
2442 | * rename, we unhash the dentry in advance. | |
2443 | */ | |
d9f29500 | 2444 | if (!d_unhashed(new_dentry)) { |
27226104 | 2445 | d_drop(new_dentry); |
d9f29500 BC |
2446 | rehash = new_dentry; |
2447 | } | |
1da177e4 | 2448 | |
84d08fa8 | 2449 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2450 | int err; |
2451 | ||
2452 | /* copy the target dentry's name */ | |
2453 | dentry = d_alloc(new_dentry->d_parent, | |
2454 | &new_dentry->d_name); | |
2455 | if (!dentry) | |
2456 | goto out; | |
2457 | ||
2458 | /* silly-rename the existing target ... */ | |
2459 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2460 | if (err) |
27226104 | 2461 | goto out; |
24e93025 MS |
2462 | |
2463 | new_dentry = dentry; | |
d9f29500 | 2464 | rehash = NULL; |
24e93025 | 2465 | new_inode = NULL; |
27226104 | 2466 | } |
b1e4adf4 | 2467 | } |
1da177e4 | 2468 | |
d9f29500 | 2469 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
80a491fd JL |
2470 | if (IS_ERR(task)) { |
2471 | error = PTR_ERR(task); | |
2472 | goto out; | |
2473 | } | |
2474 | ||
2475 | error = rpc_wait_for_completion_task(task); | |
818a8dbe BC |
2476 | if (error != 0) { |
2477 | ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; | |
2478 | /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ | |
2479 | smp_wmb(); | |
2480 | } else | |
80a491fd JL |
2481 | error = task->tk_status; |
2482 | rpc_put_task(task); | |
59a707b0 TM |
2483 | /* Ensure the inode attributes are revalidated */ |
2484 | if (error == 0) { | |
2485 | spin_lock(&old_inode->i_lock); | |
2486 | NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
2487 | NFS_I(old_inode)->cache_validity |= NFS_INO_INVALID_CHANGE | |
2488 | | NFS_INO_INVALID_CTIME | |
2489 | | NFS_INO_REVAL_FORCED; | |
2490 | spin_unlock(&old_inode->i_lock); | |
2491 | } | |
1da177e4 | 2492 | out: |
d9f29500 BC |
2493 | if (rehash) |
2494 | d_rehash(rehash); | |
70ded201 TM |
2495 | trace_nfs_rename_exit(old_dir, old_dentry, |
2496 | new_dir, new_dentry, error); | |
d9f29500 BC |
2497 | if (!error) { |
2498 | if (new_inode != NULL) | |
2499 | nfs_drop_nlink(new_inode); | |
2500 | /* | |
2501 | * The d_move() should be here instead of in an async RPC completion | |
2502 | * handler because we need the proper locks to move the dentry. If | |
2503 | * we're interrupted by a signal, the async RPC completion handler | |
2504 | * should mark the directories for revalidation. | |
2505 | */ | |
2506 | d_move(old_dentry, new_dentry); | |
d803224c | 2507 | nfs_set_verifier(old_dentry, |
d9f29500 BC |
2508 | nfs_save_change_attribute(new_dir)); |
2509 | } else if (error == -ENOENT) | |
2510 | nfs_dentry_handle_enoent(old_dentry); | |
2511 | ||
1da177e4 LT |
2512 | /* new dentry created? */ |
2513 | if (dentry) | |
2514 | dput(dentry); | |
1da177e4 LT |
2515 | return error; |
2516 | } | |
ddda8e0a | 2517 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2518 | |
cfcea3e8 TM |
2519 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2520 | static LIST_HEAD(nfs_access_lru_list); | |
2521 | static atomic_long_t nfs_access_nr_entries; | |
2522 | ||
a8b373ee | 2523 | static unsigned long nfs_access_max_cachesize = 4*1024*1024; |
3a505845 TM |
2524 | module_param(nfs_access_max_cachesize, ulong, 0644); |
2525 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2526 | ||
1c3c07e9 TM |
2527 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2528 | { | |
b68572e0 | 2529 | put_cred(entry->cred); |
f682a398 | 2530 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2531 | smp_mb__before_atomic(); |
cfcea3e8 | 2532 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2533 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2534 | } |
2535 | ||
1a81bb8a TM |
2536 | static void nfs_access_free_list(struct list_head *head) |
2537 | { | |
2538 | struct nfs_access_entry *cache; | |
2539 | ||
2540 | while (!list_empty(head)) { | |
2541 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2542 | list_del(&cache->lru); | |
2543 | nfs_access_free_entry(cache); | |
2544 | } | |
2545 | } | |
2546 | ||
3a505845 TM |
2547 | static unsigned long |
2548 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2549 | { |
2550 | LIST_HEAD(head); | |
aa510da5 | 2551 | struct nfs_inode *nfsi, *next; |
979df72e | 2552 | struct nfs_access_entry *cache; |
1ab6c499 | 2553 | long freed = 0; |
979df72e | 2554 | |
a50f7951 | 2555 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2556 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2557 | struct inode *inode; |
2558 | ||
2559 | if (nr_to_scan-- == 0) | |
2560 | break; | |
9c7e7e23 | 2561 | inode = &nfsi->vfs_inode; |
979df72e TM |
2562 | spin_lock(&inode->i_lock); |
2563 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2564 | goto remove_lru_entry; | |
2565 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2566 | struct nfs_access_entry, lru); | |
2567 | list_move(&cache->lru, &head); | |
2568 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2569 | freed++; |
979df72e TM |
2570 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2571 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2572 | &nfs_access_lru_list); | |
2573 | else { | |
2574 | remove_lru_entry: | |
2575 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2576 | smp_mb__before_atomic(); |
979df72e | 2577 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2578 | smp_mb__after_atomic(); |
979df72e | 2579 | } |
59844a9b | 2580 | spin_unlock(&inode->i_lock); |
979df72e TM |
2581 | } |
2582 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2583 | nfs_access_free_list(&head); |
1ab6c499 DC |
2584 | return freed; |
2585 | } | |
2586 | ||
3a505845 TM |
2587 | unsigned long |
2588 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2589 | { | |
2590 | int nr_to_scan = sc->nr_to_scan; | |
2591 | gfp_t gfp_mask = sc->gfp_mask; | |
2592 | ||
2593 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2594 | return SHRINK_STOP; | |
2595 | return nfs_do_access_cache_scan(nr_to_scan); | |
2596 | } | |
2597 | ||
2598 | ||
1ab6c499 DC |
2599 | unsigned long |
2600 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2601 | { | |
55f841ce | 2602 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2603 | } |
2604 | ||
3a505845 TM |
2605 | static void |
2606 | nfs_access_cache_enforce_limit(void) | |
2607 | { | |
2608 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2609 | unsigned long diff; | |
2610 | unsigned int nr_to_scan; | |
2611 | ||
2612 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2613 | return; | |
2614 | nr_to_scan = 100; | |
2615 | diff = nr_entries - nfs_access_max_cachesize; | |
2616 | if (diff < nr_to_scan) | |
2617 | nr_to_scan = diff; | |
2618 | nfs_do_access_cache_scan(nr_to_scan); | |
2619 | } | |
2620 | ||
1a81bb8a | 2621 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2622 | { |
1c3c07e9 | 2623 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2624 | struct rb_node *n; |
1c3c07e9 TM |
2625 | struct nfs_access_entry *entry; |
2626 | ||
2627 | /* Unhook entries from the cache */ | |
2628 | while ((n = rb_first(root_node)) != NULL) { | |
2629 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2630 | rb_erase(n, root_node); | |
1a81bb8a | 2631 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2632 | } |
2633 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2634 | } |
2635 | ||
1c3c07e9 | 2636 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2637 | { |
1a81bb8a TM |
2638 | LIST_HEAD(head); |
2639 | ||
2640 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2641 | return; | |
cfcea3e8 | 2642 | /* Remove from global LRU init */ |
1a81bb8a TM |
2643 | spin_lock(&nfs_access_lru_lock); |
2644 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2645 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2646 | |
1c3c07e9 | 2647 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2648 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2649 | spin_unlock(&inode->i_lock); | |
2650 | spin_unlock(&nfs_access_lru_lock); | |
2651 | nfs_access_free_list(&head); | |
1c3c07e9 | 2652 | } |
1c606fb7 | 2653 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2654 | |
b68572e0 | 2655 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) |
1c3c07e9 TM |
2656 | { |
2657 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1c3c07e9 TM |
2658 | |
2659 | while (n != NULL) { | |
b68572e0 N |
2660 | struct nfs_access_entry *entry = |
2661 | rb_entry(n, struct nfs_access_entry, rb_node); | |
2662 | int cmp = cred_fscmp(cred, entry->cred); | |
1c3c07e9 | 2663 | |
b68572e0 | 2664 | if (cmp < 0) |
1c3c07e9 | 2665 | n = n->rb_left; |
b68572e0 | 2666 | else if (cmp > 0) |
1c3c07e9 TM |
2667 | n = n->rb_right; |
2668 | else | |
2669 | return entry; | |
1da177e4 | 2670 | } |
1c3c07e9 TM |
2671 | return NULL; |
2672 | } | |
2673 | ||
d2ae4f8b | 2674 | static int nfs_access_get_cached_locked(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block) |
1c3c07e9 TM |
2675 | { |
2676 | struct nfs_inode *nfsi = NFS_I(inode); | |
2677 | struct nfs_access_entry *cache; | |
57b69181 TM |
2678 | bool retry = true; |
2679 | int err; | |
1c3c07e9 | 2680 | |
dc59250c | 2681 | spin_lock(&inode->i_lock); |
57b69181 TM |
2682 | for(;;) { |
2683 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2684 | goto out_zap; | |
2685 | cache = nfs_access_search_rbtree(inode, cred); | |
2686 | err = -ENOENT; | |
2687 | if (cache == NULL) | |
2688 | goto out; | |
2689 | /* Found an entry, is our attribute cache valid? */ | |
21c3ba7e | 2690 | if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
57b69181 | 2691 | break; |
5c965db8 TM |
2692 | if (!retry) |
2693 | break; | |
57b69181 TM |
2694 | err = -ECHILD; |
2695 | if (!may_block) | |
2696 | goto out; | |
57b69181 TM |
2697 | spin_unlock(&inode->i_lock); |
2698 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2699 | if (err) | |
2700 | return err; | |
2701 | spin_lock(&inode->i_lock); | |
2702 | retry = false; | |
2703 | } | |
1c3c07e9 TM |
2704 | res->cred = cache->cred; |
2705 | res->mask = cache->mask; | |
cfcea3e8 | 2706 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2707 | err = 0; |
2708 | out: | |
2709 | spin_unlock(&inode->i_lock); | |
2710 | return err; | |
1c3c07e9 | 2711 | out_zap: |
1a81bb8a TM |
2712 | spin_unlock(&inode->i_lock); |
2713 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2714 | return -ENOENT; |
2715 | } | |
2716 | ||
b68572e0 | 2717 | static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) |
f682a398 N |
2718 | { |
2719 | /* Only check the most recently returned cache entry, | |
2720 | * but do it without locking. | |
2721 | */ | |
2722 | struct nfs_inode *nfsi = NFS_I(inode); | |
2723 | struct nfs_access_entry *cache; | |
2724 | int err = -ECHILD; | |
2725 | struct list_head *lh; | |
2726 | ||
2727 | rcu_read_lock(); | |
2728 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2729 | goto out; | |
9f01eb5d | 2730 | lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru)); |
f682a398 N |
2731 | cache = list_entry(lh, struct nfs_access_entry, lru); |
2732 | if (lh == &nfsi->access_cache_entry_lru || | |
9a206de2 | 2733 | cred_fscmp(cred, cache->cred) != 0) |
f682a398 N |
2734 | cache = NULL; |
2735 | if (cache == NULL) | |
2736 | goto out; | |
21c3ba7e | 2737 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
f682a398 | 2738 | goto out; |
f682a398 N |
2739 | res->cred = cache->cred; |
2740 | res->mask = cache->mask; | |
21c3ba7e | 2741 | err = 0; |
f682a398 N |
2742 | out: |
2743 | rcu_read_unlock(); | |
2744 | return err; | |
2745 | } | |
2746 | ||
d2ae4f8b FL |
2747 | int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct |
2748 | nfs_access_entry *res, bool may_block) | |
2749 | { | |
2750 | int status; | |
2751 | ||
2752 | status = nfs_access_get_cached_rcu(inode, cred, res); | |
2753 | if (status != 0) | |
2754 | status = nfs_access_get_cached_locked(inode, cred, res, | |
2755 | may_block); | |
2756 | ||
2757 | return status; | |
2758 | } | |
2759 | EXPORT_SYMBOL_GPL(nfs_access_get_cached); | |
2760 | ||
1c3c07e9 TM |
2761 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2762 | { | |
cfcea3e8 TM |
2763 | struct nfs_inode *nfsi = NFS_I(inode); |
2764 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2765 | struct rb_node **p = &root_node->rb_node; |
2766 | struct rb_node *parent = NULL; | |
2767 | struct nfs_access_entry *entry; | |
b68572e0 | 2768 | int cmp; |
1c3c07e9 TM |
2769 | |
2770 | spin_lock(&inode->i_lock); | |
2771 | while (*p != NULL) { | |
2772 | parent = *p; | |
2773 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
b68572e0 | 2774 | cmp = cred_fscmp(set->cred, entry->cred); |
1c3c07e9 | 2775 | |
b68572e0 | 2776 | if (cmp < 0) |
1c3c07e9 | 2777 | p = &parent->rb_left; |
b68572e0 | 2778 | else if (cmp > 0) |
1c3c07e9 TM |
2779 | p = &parent->rb_right; |
2780 | else | |
2781 | goto found; | |
2782 | } | |
2783 | rb_link_node(&set->rb_node, parent, p); | |
2784 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2785 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2786 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2787 | return; |
2788 | found: | |
2789 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2790 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2791 | list_del(&entry->lru); | |
1c3c07e9 TM |
2792 | spin_unlock(&inode->i_lock); |
2793 | nfs_access_free_entry(entry); | |
2794 | } | |
2795 | ||
6168f62c | 2796 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2797 | { |
2798 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2799 | if (cache == NULL) | |
2800 | return; | |
2801 | RB_CLEAR_NODE(&cache->rb_node); | |
b68572e0 | 2802 | cache->cred = get_cred(set->cred); |
1da177e4 | 2803 | cache->mask = set->mask; |
1c3c07e9 | 2804 | |
f682a398 N |
2805 | /* The above field assignments must be visible |
2806 | * before this item appears on the lru. We cannot easily | |
2807 | * use rcu_assign_pointer, so just force the memory barrier. | |
2808 | */ | |
2809 | smp_wmb(); | |
1c3c07e9 | 2810 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2811 | |
2812 | /* Update accounting */ | |
4e857c58 | 2813 | smp_mb__before_atomic(); |
cfcea3e8 | 2814 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2815 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2816 | |
2817 | /* Add inode to global LRU list */ | |
1a81bb8a | 2818 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2819 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2820 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2821 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2822 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2823 | spin_unlock(&nfs_access_lru_lock); |
2824 | } | |
3a505845 | 2825 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2826 | } |
6168f62c WAA |
2827 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2828 | ||
3c181827 AS |
2829 | #define NFS_MAY_READ (NFS_ACCESS_READ) |
2830 | #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2831 | NFS_ACCESS_EXTEND | \ | |
2832 | NFS_ACCESS_DELETE) | |
2833 | #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2834 | NFS_ACCESS_EXTEND) | |
ecbb903c | 2835 | #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE |
3c181827 AS |
2836 | #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) |
2837 | #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) | |
15d4b73a | 2838 | static int |
ecbb903c | 2839 | nfs_access_calc_mask(u32 access_result, umode_t umode) |
15d4b73a TM |
2840 | { |
2841 | int mask = 0; | |
2842 | ||
2843 | if (access_result & NFS_MAY_READ) | |
2844 | mask |= MAY_READ; | |
ecbb903c TM |
2845 | if (S_ISDIR(umode)) { |
2846 | if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) | |
2847 | mask |= MAY_WRITE; | |
2848 | if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) | |
2849 | mask |= MAY_EXEC; | |
2850 | } else if (S_ISREG(umode)) { | |
2851 | if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) | |
2852 | mask |= MAY_WRITE; | |
2853 | if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) | |
2854 | mask |= MAY_EXEC; | |
2855 | } else if (access_result & NFS_MAY_WRITE) | |
2856 | mask |= MAY_WRITE; | |
15d4b73a TM |
2857 | return mask; |
2858 | } | |
2859 | ||
6168f62c WAA |
2860 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) |
2861 | { | |
bd8b2441 | 2862 | entry->mask = access_result; |
6168f62c WAA |
2863 | } |
2864 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 | 2865 | |
b68572e0 | 2866 | static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) |
1da177e4 LT |
2867 | { |
2868 | struct nfs_access_entry cache; | |
57b69181 | 2869 | bool may_block = (mask & MAY_NOT_BLOCK) == 0; |
e8194b7d | 2870 | int cache_mask = -1; |
1da177e4 LT |
2871 | int status; |
2872 | ||
f4ce1299 TM |
2873 | trace_nfs_access_enter(inode); |
2874 | ||
d2ae4f8b | 2875 | status = nfs_access_get_cached(inode, cred, &cache, may_block); |
1da177e4 | 2876 | if (status == 0) |
f4ce1299 | 2877 | goto out_cached; |
1da177e4 | 2878 | |
f3324a2a | 2879 | status = -ECHILD; |
57b69181 | 2880 | if (!may_block) |
f3324a2a N |
2881 | goto out; |
2882 | ||
1750d929 AS |
2883 | /* |
2884 | * Determine which access bits we want to ask for... | |
2885 | */ | |
2886 | cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; | |
72832a24 FL |
2887 | if (nfs_server_capable(inode, NFS_CAP_XATTR)) { |
2888 | cache.mask |= NFS_ACCESS_XAREAD | NFS_ACCESS_XAWRITE | | |
2889 | NFS_ACCESS_XALIST; | |
2890 | } | |
1750d929 AS |
2891 | if (S_ISDIR(inode->i_mode)) |
2892 | cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; | |
2893 | else | |
2894 | cache.mask |= NFS_ACCESS_EXECUTE; | |
1da177e4 | 2895 | cache.cred = cred; |
1da177e4 | 2896 | status = NFS_PROTO(inode)->access(inode, &cache); |
a71ee337 SJ |
2897 | if (status != 0) { |
2898 | if (status == -ESTALE) { | |
a71ee337 | 2899 | if (!S_ISDIR(inode->i_mode)) |
93ce4af7 TM |
2900 | nfs_set_inode_stale(inode); |
2901 | else | |
2902 | nfs_zap_caches(inode); | |
a71ee337 | 2903 | } |
f4ce1299 | 2904 | goto out; |
a71ee337 | 2905 | } |
1da177e4 | 2906 | nfs_access_add_cache(inode, &cache); |
f4ce1299 | 2907 | out_cached: |
ecbb903c | 2908 | cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); |
bd8b2441 | 2909 | if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) |
f4ce1299 | 2910 | status = -EACCES; |
1da177e4 | 2911 | out: |
e8194b7d | 2912 | trace_nfs_access_exit(inode, mask, cache_mask, status); |
f4ce1299 | 2913 | return status; |
1da177e4 LT |
2914 | } |
2915 | ||
af22f94a TM |
2916 | static int nfs_open_permission_mask(int openflags) |
2917 | { | |
2918 | int mask = 0; | |
2919 | ||
f8d9a897 WAA |
2920 | if (openflags & __FMODE_EXEC) { |
2921 | /* ONLY check exec rights */ | |
2922 | mask = MAY_EXEC; | |
2923 | } else { | |
2924 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2925 | mask |= MAY_READ; | |
2926 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2927 | mask |= MAY_WRITE; | |
2928 | } | |
2929 | ||
af22f94a TM |
2930 | return mask; |
2931 | } | |
2932 | ||
b68572e0 | 2933 | int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) |
af22f94a TM |
2934 | { |
2935 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2936 | } | |
89d77c8f | 2937 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2938 | |
5c5fc09a TM |
2939 | static int nfs_execute_ok(struct inode *inode, int mask) |
2940 | { | |
2941 | struct nfs_server *server = NFS_SERVER(inode); | |
21c3ba7e | 2942 | int ret = 0; |
5c5fc09a | 2943 | |
3825827e TM |
2944 | if (S_ISDIR(inode->i_mode)) |
2945 | return 0; | |
cf834027 | 2946 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_OTHER)) { |
21c3ba7e TM |
2947 | if (mask & MAY_NOT_BLOCK) |
2948 | return -ECHILD; | |
2949 | ret = __nfs_revalidate_inode(server, inode); | |
2950 | } | |
5c5fc09a TM |
2951 | if (ret == 0 && !execute_ok(inode)) |
2952 | ret = -EACCES; | |
2953 | return ret; | |
2954 | } | |
2955 | ||
10556cb2 | 2956 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 | 2957 | { |
b68572e0 | 2958 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2959 | int res = 0; |
2960 | ||
91d5b470 CL |
2961 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2962 | ||
e6305c43 | 2963 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2964 | goto out; |
2965 | /* Is this sys_access() ? */ | |
9cfcac81 | 2966 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2967 | goto force_lookup; |
2968 | ||
2969 | switch (inode->i_mode & S_IFMT) { | |
2970 | case S_IFLNK: | |
2971 | goto out; | |
2972 | case S_IFREG: | |
762674f8 TM |
2973 | if ((mask & MAY_OPEN) && |
2974 | nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) | |
2975 | return 0; | |
1da177e4 LT |
2976 | break; |
2977 | case S_IFDIR: | |
2978 | /* | |
2979 | * Optimize away all write operations, since the server | |
2980 | * will check permissions when we perform the op. | |
2981 | */ | |
2982 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2983 | goto out; | |
2984 | } | |
2985 | ||
2986 | force_lookup: | |
1da177e4 LT |
2987 | if (!NFS_PROTO(inode)->access) |
2988 | goto out_notsup; | |
2989 | ||
eb095c14 | 2990 | res = nfs_do_access(inode, cred, mask); |
1da177e4 | 2991 | out: |
5c5fc09a TM |
2992 | if (!res && (mask & MAY_EXEC)) |
2993 | res = nfs_execute_ok(inode, mask); | |
f696a365 | 2994 | |
1e8968c5 | 2995 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2996 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2997 | return res; |
2998 | out_notsup: | |
d51ac1a8 N |
2999 | if (mask & MAY_NOT_BLOCK) |
3000 | return -ECHILD; | |
3001 | ||
1da177e4 LT |
3002 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
3003 | if (res == 0) | |
2830ba7f | 3004 | res = generic_permission(inode, mask); |
1e7cb3dc | 3005 | goto out; |
1da177e4 | 3006 | } |
ddda8e0a | 3007 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
3008 | |
3009 | /* | |
3010 | * Local variables: | |
3011 | * version-control: t | |
3012 | * kept-new-versions: 5 | |
3013 | * End: | |
3014 | */ |