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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)) | |
ac46b3d7 TM |
84 | nfs_set_cache_invalid(dir, |
85 | NFS_INO_INVALID_DATA | | |
86 | NFS_INO_REVAL_FORCED); | |
311324ad TM |
87 | list_add(&ctx->list, &nfsi->open_files); |
88 | spin_unlock(&dir->i_lock); | |
0c030806 TM |
89 | return ctx; |
90 | } | |
91 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
92 | } |
93 | ||
311324ad | 94 | static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) |
480c2006 | 95 | { |
311324ad TM |
96 | spin_lock(&dir->i_lock); |
97 | list_del(&ctx->list); | |
98 | spin_unlock(&dir->i_lock); | |
480c2006 BS |
99 | kfree(ctx); |
100 | } | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * Open file | |
104 | */ | |
105 | static int | |
106 | nfs_opendir(struct inode *inode, struct file *filp) | |
107 | { | |
480c2006 BS |
108 | int res = 0; |
109 | struct nfs_open_dir_context *ctx; | |
1da177e4 | 110 | |
6de1472f | 111 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
112 | |
113 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 114 | |
93b8959a | 115 | ctx = alloc_nfs_open_dir_context(inode); |
480c2006 BS |
116 | if (IS_ERR(ctx)) { |
117 | res = PTR_ERR(ctx); | |
118 | goto out; | |
119 | } | |
120 | filp->private_data = ctx; | |
480c2006 | 121 | out: |
1da177e4 LT |
122 | return res; |
123 | } | |
124 | ||
480c2006 BS |
125 | static int |
126 | nfs_closedir(struct inode *inode, struct file *filp) | |
127 | { | |
a455589f | 128 | put_nfs_open_dir_context(file_inode(filp), filp->private_data); |
480c2006 BS |
129 | return 0; |
130 | } | |
131 | ||
d1bacf9e BS |
132 | struct nfs_cache_array_entry { |
133 | u64 cookie; | |
134 | u64 ino; | |
a52a8a6a TM |
135 | const char *name; |
136 | unsigned int name_len; | |
0b26a0bf | 137 | unsigned char d_type; |
d1bacf9e BS |
138 | }; |
139 | ||
140 | struct nfs_cache_array { | |
d1bacf9e | 141 | u64 last_cookie; |
b1e21c97 TM |
142 | unsigned int size; |
143 | unsigned char page_full : 1, | |
762567b7 TM |
144 | page_is_eof : 1, |
145 | cookies_are_ordered : 1; | |
5601cda8 | 146 | struct nfs_cache_array_entry array[]; |
d1bacf9e BS |
147 | }; |
148 | ||
6c981eff | 149 | struct nfs_readdir_descriptor { |
1da177e4 LT |
150 | struct file *file; |
151 | struct page *page; | |
23db8620 | 152 | struct dir_context *ctx; |
1f1d4aa4 | 153 | pgoff_t page_index; |
2e7a4641 | 154 | u64 dir_cookie; |
0aded708 | 155 | u64 last_cookie; |
2e7a4641 | 156 | u64 dup_cookie; |
f0dd2136 | 157 | loff_t current_index; |
59e356a9 | 158 | loff_t prev_index; |
d1bacf9e | 159 | |
b593c09f | 160 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
a1147b82 | 161 | unsigned long dir_verifier; |
1f4eab7e | 162 | unsigned long timestamp; |
4704f0e2 | 163 | unsigned long gencount; |
2e7a4641 | 164 | unsigned long attr_gencount; |
d1bacf9e | 165 | unsigned int cache_entry_index; |
2e7a4641 | 166 | signed char duped; |
a7a3b1e9 BC |
167 | bool plus; |
168 | bool eof; | |
6c981eff | 169 | }; |
1da177e4 | 170 | |
1f1d4aa4 TM |
171 | static void nfs_readdir_array_init(struct nfs_cache_array *array) |
172 | { | |
173 | memset(array, 0, sizeof(struct nfs_cache_array)); | |
174 | } | |
175 | ||
176 | static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie) | |
4b310319 TM |
177 | { |
178 | struct nfs_cache_array *array; | |
179 | ||
180 | array = kmap_atomic(page); | |
1f1d4aa4 TM |
181 | nfs_readdir_array_init(array); |
182 | array->last_cookie = last_cookie; | |
762567b7 | 183 | array->cookies_are_ordered = 1; |
4b310319 TM |
184 | kunmap_atomic(array); |
185 | } | |
186 | ||
d1bacf9e BS |
187 | /* |
188 | * we are freeing strings created by nfs_add_to_readdir_array() | |
189 | */ | |
190 | static | |
11de3b11 | 191 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 192 | { |
11de3b11 | 193 | struct nfs_cache_array *array; |
d1bacf9e | 194 | int i; |
8cd51a0c | 195 | |
2b86ce2d | 196 | array = kmap_atomic(page); |
b044f645 | 197 | for (i = 0; i < array->size; i++) |
a52a8a6a | 198 | kfree(array->array[i].name); |
1f1d4aa4 | 199 | nfs_readdir_array_init(array); |
2b86ce2d | 200 | kunmap_atomic(array); |
d1bacf9e BS |
201 | } |
202 | ||
35df59d3 TM |
203 | static struct page * |
204 | nfs_readdir_page_array_alloc(u64 last_cookie, gfp_t gfp_flags) | |
205 | { | |
206 | struct page *page = alloc_page(gfp_flags); | |
207 | if (page) | |
208 | nfs_readdir_page_init_array(page, last_cookie); | |
209 | return page; | |
210 | } | |
211 | ||
212 | static void nfs_readdir_page_array_free(struct page *page) | |
213 | { | |
214 | if (page) { | |
215 | nfs_readdir_clear_array(page); | |
216 | put_page(page); | |
217 | } | |
218 | } | |
219 | ||
b1e21c97 TM |
220 | static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) |
221 | { | |
222 | array->page_is_eof = 1; | |
223 | array->page_full = 1; | |
224 | } | |
225 | ||
226 | static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) | |
227 | { | |
228 | return array->page_full; | |
229 | } | |
230 | ||
d1bacf9e BS |
231 | /* |
232 | * the caller is responsible for freeing qstr.name | |
233 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
234 | * nfs_clear_readdir_array() | |
235 | */ | |
a52a8a6a | 236 | static const char *nfs_readdir_copy_name(const char *name, unsigned int len) |
d1bacf9e | 237 | { |
a52a8a6a TM |
238 | const char *ret = kmemdup_nul(name, len, GFP_KERNEL); |
239 | ||
04e4bd1c CM |
240 | /* |
241 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
242 | * in a page cache page which kmemleak does not scan. | |
243 | */ | |
a52a8a6a TM |
244 | if (ret != NULL) |
245 | kmemleak_not_leak(ret); | |
246 | return ret; | |
d1bacf9e BS |
247 | } |
248 | ||
b1e21c97 TM |
249 | /* |
250 | * Check that the next array entry lies entirely within the page bounds | |
251 | */ | |
252 | static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) | |
253 | { | |
254 | struct nfs_cache_array_entry *cache_entry; | |
255 | ||
256 | if (array->page_full) | |
257 | return -ENOSPC; | |
258 | cache_entry = &array->array[array->size + 1]; | |
259 | if ((char *)cache_entry - (char *)array > PAGE_SIZE) { | |
260 | array->page_full = 1; | |
261 | return -ENOSPC; | |
262 | } | |
4a201d6e | 263 | return 0; |
d1bacf9e BS |
264 | } |
265 | ||
266 | static | |
267 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
268 | { | |
a52a8a6a | 269 | struct nfs_cache_array *array; |
4a201d6e | 270 | struct nfs_cache_array_entry *cache_entry; |
a52a8a6a | 271 | const char *name; |
4a201d6e TM |
272 | int ret; |
273 | ||
a52a8a6a TM |
274 | name = nfs_readdir_copy_name(entry->name, entry->len); |
275 | if (!name) | |
276 | return -ENOMEM; | |
3020093f | 277 | |
a52a8a6a | 278 | array = kmap_atomic(page); |
b1e21c97 | 279 | ret = nfs_readdir_array_can_expand(array); |
a52a8a6a TM |
280 | if (ret) { |
281 | kfree(name); | |
4a201d6e | 282 | goto out; |
a52a8a6a | 283 | } |
d1bacf9e | 284 | |
b1e21c97 | 285 | cache_entry = &array->array[array->size]; |
4a201d6e TM |
286 | cache_entry->cookie = entry->prev_cookie; |
287 | cache_entry->ino = entry->ino; | |
0b26a0bf | 288 | cache_entry->d_type = entry->d_type; |
a52a8a6a TM |
289 | cache_entry->name_len = entry->len; |
290 | cache_entry->name = name; | |
d1bacf9e | 291 | array->last_cookie = entry->cookie; |
762567b7 TM |
292 | if (array->last_cookie <= cache_entry->cookie) |
293 | array->cookies_are_ordered = 0; | |
8cd51a0c | 294 | array->size++; |
47c716cb | 295 | if (entry->eof != 0) |
b1e21c97 | 296 | nfs_readdir_array_set_eof(array); |
4a201d6e | 297 | out: |
a52a8a6a | 298 | kunmap_atomic(array); |
4a201d6e | 299 | return ret; |
d1bacf9e BS |
300 | } |
301 | ||
1f1d4aa4 TM |
302 | static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, |
303 | pgoff_t index, u64 last_cookie) | |
304 | { | |
305 | struct page *page; | |
306 | ||
307 | page = grab_cache_page(mapping, index); | |
308 | if (page && !PageUptodate(page)) { | |
309 | nfs_readdir_page_init_array(page, last_cookie); | |
310 | if (invalidate_inode_pages2_range(mapping, index + 1, -1) < 0) | |
311 | nfs_zap_mapping(mapping->host, mapping); | |
312 | SetPageUptodate(page); | |
313 | } | |
314 | ||
315 | return page; | |
316 | } | |
317 | ||
318 | static u64 nfs_readdir_page_last_cookie(struct page *page) | |
319 | { | |
320 | struct nfs_cache_array *array; | |
321 | u64 ret; | |
322 | ||
323 | array = kmap_atomic(page); | |
324 | ret = array->last_cookie; | |
325 | kunmap_atomic(array); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | static bool nfs_readdir_page_needs_filling(struct page *page) | |
330 | { | |
331 | struct nfs_cache_array *array; | |
332 | bool ret; | |
333 | ||
334 | array = kmap_atomic(page); | |
335 | ret = !nfs_readdir_array_is_full(array); | |
336 | kunmap_atomic(array); | |
4a201d6e | 337 | return ret; |
d1bacf9e BS |
338 | } |
339 | ||
b1e21c97 TM |
340 | static void nfs_readdir_page_set_eof(struct page *page) |
341 | { | |
342 | struct nfs_cache_array *array; | |
343 | ||
344 | array = kmap_atomic(page); | |
345 | nfs_readdir_array_set_eof(array); | |
346 | kunmap_atomic(array); | |
347 | } | |
348 | ||
3b2a09f1 TM |
349 | static void nfs_readdir_page_unlock_and_put(struct page *page) |
350 | { | |
351 | unlock_page(page); | |
352 | put_page(page); | |
353 | } | |
354 | ||
355 | static struct page *nfs_readdir_page_get_next(struct address_space *mapping, | |
356 | pgoff_t index, u64 cookie) | |
357 | { | |
358 | struct page *page; | |
359 | ||
360 | page = nfs_readdir_page_get_locked(mapping, index, cookie); | |
361 | if (page) { | |
362 | if (nfs_readdir_page_last_cookie(page) == cookie) | |
363 | return page; | |
364 | nfs_readdir_page_unlock_and_put(page); | |
365 | } | |
366 | return NULL; | |
367 | } | |
368 | ||
59e356a9 TM |
369 | static inline |
370 | int is_32bit_api(void) | |
371 | { | |
372 | #ifdef CONFIG_COMPAT | |
373 | return in_compat_syscall(); | |
374 | #else | |
375 | return (BITS_PER_LONG == 32); | |
376 | #endif | |
377 | } | |
378 | ||
379 | static | |
380 | bool nfs_readdir_use_cookie(const struct file *filp) | |
381 | { | |
382 | if ((filp->f_mode & FMODE_32BITHASH) || | |
383 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) | |
384 | return false; | |
385 | return true; | |
386 | } | |
387 | ||
6c981eff TM |
388 | static int nfs_readdir_search_for_pos(struct nfs_cache_array *array, |
389 | struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 390 | { |
23db8620 | 391 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
392 | unsigned int index; |
393 | ||
394 | if (diff < 0) | |
395 | goto out_eof; | |
396 | if (diff >= array->size) { | |
b1e21c97 | 397 | if (array->page_is_eof) |
d1bacf9e | 398 | goto out_eof; |
d1bacf9e BS |
399 | return -EAGAIN; |
400 | } | |
401 | ||
402 | index = (unsigned int)diff; | |
2e7a4641 | 403 | desc->dir_cookie = array->array[index].cookie; |
d1bacf9e | 404 | desc->cache_entry_index = index; |
d1bacf9e BS |
405 | return 0; |
406 | out_eof: | |
6089dd0d | 407 | desc->eof = true; |
d1bacf9e BS |
408 | return -EBADCOOKIE; |
409 | } | |
410 | ||
4db72b40 JL |
411 | static bool |
412 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
413 | { | |
414 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
415 | return false; | |
416 | smp_rmb(); | |
417 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
418 | } | |
419 | ||
762567b7 TM |
420 | static bool nfs_readdir_array_cookie_in_range(struct nfs_cache_array *array, |
421 | u64 cookie) | |
422 | { | |
423 | if (!array->cookies_are_ordered) | |
424 | return true; | |
425 | /* Optimisation for monotonically increasing cookies */ | |
426 | if (cookie >= array->last_cookie) | |
427 | return false; | |
428 | if (array->size && cookie < array->array[0].cookie) | |
429 | return false; | |
430 | return true; | |
431 | } | |
432 | ||
6c981eff TM |
433 | static int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, |
434 | struct nfs_readdir_descriptor *desc) | |
d1bacf9e BS |
435 | { |
436 | int i; | |
8ef2ce3e | 437 | loff_t new_pos; |
d1bacf9e BS |
438 | int status = -EAGAIN; |
439 | ||
762567b7 TM |
440 | if (!nfs_readdir_array_cookie_in_range(array, desc->dir_cookie)) |
441 | goto check_eof; | |
442 | ||
d1bacf9e | 443 | for (i = 0; i < array->size; i++) { |
2e7a4641 | 444 | if (array->array[i].cookie == desc->dir_cookie) { |
496ad9aa | 445 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 | 446 | |
8ef2ce3e | 447 | new_pos = desc->current_index + i; |
2e7a4641 | 448 | if (desc->attr_gencount != nfsi->attr_gencount || |
4db72b40 | 449 | !nfs_readdir_inode_mapping_valid(nfsi)) { |
2e7a4641 TM |
450 | desc->duped = 0; |
451 | desc->attr_gencount = nfsi->attr_gencount; | |
59e356a9 | 452 | } else if (new_pos < desc->prev_index) { |
2e7a4641 TM |
453 | if (desc->duped > 0 |
454 | && desc->dup_cookie == desc->dir_cookie) { | |
0c030806 | 455 | if (printk_ratelimit()) { |
6de1472f | 456 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 457 | "Please contact your server vendor. " |
a52a8a6a TM |
458 | "The file: %s has duplicate cookie %llu\n", |
459 | desc->file, array->array[i].name, desc->dir_cookie); | |
0c030806 TM |
460 | } |
461 | status = -ELOOP; | |
462 | goto out; | |
463 | } | |
2e7a4641 TM |
464 | desc->dup_cookie = desc->dir_cookie; |
465 | desc->duped = -1; | |
8ef2ce3e | 466 | } |
59e356a9 | 467 | if (nfs_readdir_use_cookie(desc->file)) |
2e7a4641 | 468 | desc->ctx->pos = desc->dir_cookie; |
59e356a9 TM |
469 | else |
470 | desc->ctx->pos = new_pos; | |
471 | desc->prev_index = new_pos; | |
d1bacf9e | 472 | desc->cache_entry_index = i; |
47c716cb | 473 | return 0; |
d1bacf9e BS |
474 | } |
475 | } | |
762567b7 | 476 | check_eof: |
b1e21c97 | 477 | if (array->page_is_eof) { |
8cd51a0c | 478 | status = -EBADCOOKIE; |
2e7a4641 | 479 | if (desc->dir_cookie == array->last_cookie) |
6089dd0d | 480 | desc->eof = true; |
8cd51a0c | 481 | } |
0c030806 | 482 | out: |
d1bacf9e BS |
483 | return status; |
484 | } | |
485 | ||
6c981eff | 486 | static int nfs_readdir_search_array(struct nfs_readdir_descriptor *desc) |
d1bacf9e BS |
487 | { |
488 | struct nfs_cache_array *array; | |
47c716cb | 489 | int status; |
d1bacf9e | 490 | |
ed09222d | 491 | array = kmap_atomic(desc->page); |
d1bacf9e | 492 | |
2e7a4641 | 493 | if (desc->dir_cookie == 0) |
d1bacf9e BS |
494 | status = nfs_readdir_search_for_pos(array, desc); |
495 | else | |
496 | status = nfs_readdir_search_for_cookie(array, desc); | |
497 | ||
47c716cb | 498 | if (status == -EAGAIN) { |
0aded708 | 499 | desc->last_cookie = array->last_cookie; |
e47c085a | 500 | desc->current_index += array->size; |
47c716cb TM |
501 | desc->page_index++; |
502 | } | |
ed09222d | 503 | kunmap_atomic(array); |
d1bacf9e BS |
504 | return status; |
505 | } | |
506 | ||
507 | /* Fill a page with xdr information before transferring to the cache page */ | |
93b8959a | 508 | static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, |
b593c09f TM |
509 | __be32 *verf, u64 cookie, |
510 | struct page **pages, size_t bufsize, | |
511 | __be32 *verf_res) | |
1da177e4 | 512 | { |
82e22a5e | 513 | struct inode *inode = file_inode(desc->file); |
82e22a5e TM |
514 | struct nfs_readdir_arg arg = { |
515 | .dentry = file_dentry(desc->file), | |
516 | .cred = desc->file->f_cred, | |
b593c09f | 517 | .verf = verf, |
82e22a5e TM |
518 | .cookie = cookie, |
519 | .pages = pages, | |
520 | .page_len = bufsize, | |
521 | .plus = desc->plus, | |
522 | }; | |
523 | struct nfs_readdir_res res = { | |
524 | .verf = verf_res, | |
525 | }; | |
4704f0e2 | 526 | unsigned long timestamp, gencount; |
1da177e4 LT |
527 | int error; |
528 | ||
1da177e4 LT |
529 | again: |
530 | timestamp = jiffies; | |
4704f0e2 | 531 | gencount = nfs_inc_attr_generation_counter(); |
a1147b82 | 532 | desc->dir_verifier = nfs_save_change_attribute(inode); |
82e22a5e | 533 | error = NFS_PROTO(inode)->readdir(&arg, &res); |
1da177e4 LT |
534 | if (error < 0) { |
535 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
536 | if (error == -ENOTSUPP && desc->plus) { | |
537 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 538 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
82e22a5e | 539 | desc->plus = arg.plus = false; |
1da177e4 LT |
540 | goto again; |
541 | } | |
542 | goto error; | |
543 | } | |
1f4eab7e | 544 | desc->timestamp = timestamp; |
4704f0e2 | 545 | desc->gencount = gencount; |
d1bacf9e BS |
546 | error: |
547 | return error; | |
1da177e4 LT |
548 | } |
549 | ||
6c981eff | 550 | static int xdr_decode(struct nfs_readdir_descriptor *desc, |
573c4e1e | 551 | struct nfs_entry *entry, struct xdr_stream *xdr) |
1da177e4 | 552 | { |
59e356a9 | 553 | struct inode *inode = file_inode(desc->file); |
573c4e1e | 554 | int error; |
1da177e4 | 555 | |
59e356a9 | 556 | error = NFS_PROTO(inode)->decode_dirent(xdr, entry, desc->plus); |
573c4e1e CL |
557 | if (error) |
558 | return error; | |
d1bacf9e BS |
559 | entry->fattr->time_start = desc->timestamp; |
560 | entry->fattr->gencount = desc->gencount; | |
561 | return 0; | |
1da177e4 LT |
562 | } |
563 | ||
fa923369 TM |
564 | /* Match file and dirent using either filehandle or fileid |
565 | * Note: caller is responsible for checking the fsid | |
566 | */ | |
d39ab9de BS |
567 | static |
568 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
569 | { | |
d8fdb47f | 570 | struct inode *inode; |
fa923369 TM |
571 | struct nfs_inode *nfsi; |
572 | ||
2b0143b5 DH |
573 | if (d_really_is_negative(dentry)) |
574 | return 0; | |
fa923369 | 575 | |
d8fdb47f TM |
576 | inode = d_inode(dentry); |
577 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
578 | return 0; | |
579 | ||
580 | nfsi = NFS_I(inode); | |
7dc72d5f TM |
581 | if (entry->fattr->fileid != nfsi->fileid) |
582 | return 0; | |
583 | if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) | |
584 | return 0; | |
585 | return 1; | |
d39ab9de BS |
586 | } |
587 | ||
d69ee9b8 | 588 | static |
23db8620 | 589 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
590 | { |
591 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
592 | return false; | |
593 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
594 | return true; | |
23db8620 | 595 | if (ctx->pos == 0) |
d69ee9b8 TM |
596 | return true; |
597 | return false; | |
598 | } | |
599 | ||
600 | /* | |
63519fbc TM |
601 | * This function is called by the lookup and getattr code to request the |
602 | * use of readdirplus to accelerate any future lookups in the same | |
d69ee9b8 TM |
603 | * directory. |
604 | */ | |
d69ee9b8 TM |
605 | void nfs_advise_use_readdirplus(struct inode *dir) |
606 | { | |
63519fbc TM |
607 | struct nfs_inode *nfsi = NFS_I(dir); |
608 | ||
609 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
610 | !list_empty(&nfsi->open_files)) | |
611 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
d69ee9b8 TM |
612 | } |
613 | ||
311324ad TM |
614 | /* |
615 | * This function is mainly for use by nfs_getattr(). | |
616 | * | |
617 | * If this is an 'ls -l', we want to force use of readdirplus. | |
618 | * Do this by checking if there is an active file descriptor | |
619 | * and calling nfs_advise_use_readdirplus, then forcing a | |
620 | * cache flush. | |
621 | */ | |
622 | void nfs_force_use_readdirplus(struct inode *dir) | |
623 | { | |
63519fbc TM |
624 | struct nfs_inode *nfsi = NFS_I(dir); |
625 | ||
626 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
627 | !list_empty(&nfsi->open_files)) { | |
628 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
227823d2 DN |
629 | invalidate_mapping_pages(dir->i_mapping, |
630 | nfsi->page_index + 1, -1); | |
311324ad TM |
631 | } |
632 | } | |
633 | ||
d39ab9de | 634 | static |
a1147b82 TM |
635 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, |
636 | unsigned long dir_verifier) | |
d39ab9de | 637 | { |
26fe5750 | 638 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
9ac3d3e8 | 639 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
4a201d6e TM |
640 | struct dentry *dentry; |
641 | struct dentry *alias; | |
d39ab9de | 642 | struct inode *inode; |
aa9c2669 | 643 | int status; |
d39ab9de | 644 | |
fa923369 TM |
645 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) |
646 | return; | |
6c441c25 TM |
647 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
648 | return; | |
78d04af4 TM |
649 | if (filename.len == 0) |
650 | return; | |
651 | /* Validate that the name doesn't contain any illegal '\0' */ | |
652 | if (strnlen(filename.name, filename.len) != filename.len) | |
653 | return; | |
654 | /* ...or '/' */ | |
655 | if (strnchr(filename.name, filename.len, '/')) | |
656 | return; | |
4a201d6e TM |
657 | if (filename.name[0] == '.') { |
658 | if (filename.len == 1) | |
659 | return; | |
660 | if (filename.len == 2 && filename.name[1] == '.') | |
661 | return; | |
662 | } | |
8387ff25 | 663 | filename.hash = full_name_hash(parent, filename.name, filename.len); |
d39ab9de | 664 | |
4a201d6e | 665 | dentry = d_lookup(parent, &filename); |
9ac3d3e8 AV |
666 | again: |
667 | if (!dentry) { | |
668 | dentry = d_alloc_parallel(parent, &filename, &wq); | |
669 | if (IS_ERR(dentry)) | |
670 | return; | |
671 | } | |
672 | if (!d_in_lookup(dentry)) { | |
6c441c25 TM |
673 | /* Is there a mountpoint here? If so, just exit */ |
674 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
675 | &entry->fattr->fsid)) | |
676 | goto out; | |
d39ab9de | 677 | if (nfs_same_file(dentry, entry)) { |
7dc72d5f TM |
678 | if (!entry->fh->size) |
679 | goto out; | |
a1147b82 | 680 | nfs_set_verifier(dentry, dir_verifier); |
2b0143b5 | 681 | status = nfs_refresh_inode(d_inode(dentry), entry->fattr); |
aa9c2669 | 682 | if (!status) |
2b0143b5 | 683 | nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); |
d39ab9de BS |
684 | goto out; |
685 | } else { | |
5542aa2f | 686 | d_invalidate(dentry); |
d39ab9de | 687 | dput(dentry); |
9ac3d3e8 AV |
688 | dentry = NULL; |
689 | goto again; | |
d39ab9de BS |
690 | } |
691 | } | |
7dc72d5f TM |
692 | if (!entry->fh->size) { |
693 | d_lookup_done(dentry); | |
694 | goto out; | |
695 | } | |
d39ab9de | 696 | |
1775fd3e | 697 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
41d28bca | 698 | alias = d_splice_alias(inode, dentry); |
9ac3d3e8 AV |
699 | d_lookup_done(dentry); |
700 | if (alias) { | |
701 | if (IS_ERR(alias)) | |
702 | goto out; | |
703 | dput(dentry); | |
704 | dentry = alias; | |
705 | } | |
a1147b82 | 706 | nfs_set_verifier(dentry, dir_verifier); |
d39ab9de BS |
707 | out: |
708 | dput(dentry); | |
d39ab9de BS |
709 | } |
710 | ||
d1bacf9e | 711 | /* Perform conversion from xdr to cache array */ |
3b2a09f1 TM |
712 | static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc, |
713 | struct nfs_entry *entry, | |
714 | struct page **xdr_pages, | |
35df59d3 TM |
715 | unsigned int buflen, |
716 | struct page **arrays, | |
717 | size_t narrays) | |
1da177e4 | 718 | { |
3b2a09f1 | 719 | struct address_space *mapping = desc->file->f_mapping; |
babddc72 | 720 | struct xdr_stream stream; |
f7da7a12 | 721 | struct xdr_buf buf; |
35df59d3 | 722 | struct page *scratch, *new, *page = *arrays; |
5c346854 | 723 | int status; |
babddc72 | 724 | |
6650239a TM |
725 | scratch = alloc_page(GFP_KERNEL); |
726 | if (scratch == NULL) | |
727 | return -ENOMEM; | |
babddc72 | 728 | |
f7da7a12 | 729 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
0ae4c3e8 | 730 | xdr_set_scratch_page(&stream, scratch); |
99424380 BS |
731 | |
732 | do { | |
d33030e2 JM |
733 | if (entry->label) |
734 | entry->label->len = NFS4_MAXLABELLEN; | |
735 | ||
99424380 | 736 | status = xdr_decode(desc, entry, &stream); |
972bcdf2 | 737 | if (status != 0) |
99424380 | 738 | break; |
5c346854 | 739 | |
a7a3b1e9 | 740 | if (desc->plus) |
a1147b82 TM |
741 | nfs_prime_dcache(file_dentry(desc->file), entry, |
742 | desc->dir_verifier); | |
8cd51a0c | 743 | |
db531db9 | 744 | status = nfs_readdir_add_to_array(entry, page); |
3b2a09f1 TM |
745 | if (status != -ENOSPC) |
746 | continue; | |
747 | ||
35df59d3 TM |
748 | if (page->mapping != mapping) { |
749 | if (!--narrays) | |
750 | break; | |
751 | new = nfs_readdir_page_array_alloc(entry->prev_cookie, | |
752 | GFP_KERNEL); | |
753 | if (!new) | |
754 | break; | |
755 | arrays++; | |
756 | *arrays = page = new; | |
757 | } else { | |
758 | new = nfs_readdir_page_get_next(mapping, | |
759 | page->index + 1, | |
760 | entry->prev_cookie); | |
761 | if (!new) | |
762 | break; | |
763 | if (page != *arrays) | |
764 | nfs_readdir_page_unlock_and_put(page); | |
765 | page = new; | |
766 | } | |
3b2a09f1 | 767 | status = nfs_readdir_add_to_array(entry, page); |
972bcdf2 | 768 | } while (!status && !entry->eof); |
99424380 | 769 | |
972bcdf2 TM |
770 | switch (status) { |
771 | case -EBADCOOKIE: | |
772 | if (entry->eof) { | |
773 | nfs_readdir_page_set_eof(page); | |
774 | status = 0; | |
775 | } | |
776 | break; | |
777 | case -ENOSPC: | |
778 | case -EAGAIN: | |
0795bf83 | 779 | status = 0; |
972bcdf2 | 780 | break; |
1da177e4 | 781 | } |
6650239a | 782 | |
35df59d3 | 783 | if (page != *arrays) |
3b2a09f1 TM |
784 | nfs_readdir_page_unlock_and_put(page); |
785 | ||
6650239a | 786 | put_page(scratch); |
8cd51a0c | 787 | return status; |
56e4ebf8 BS |
788 | } |
789 | ||
1a34c8c9 | 790 | static void nfs_readdir_free_pages(struct page **pages, size_t npages) |
56e4ebf8 | 791 | { |
1a34c8c9 TM |
792 | while (npages--) |
793 | put_page(pages[npages]); | |
794 | kfree(pages); | |
56e4ebf8 BS |
795 | } |
796 | ||
56e4ebf8 | 797 | /* |
bf211ca1 | 798 | * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call |
799 | * to nfs_readdir_free_pages() | |
56e4ebf8 | 800 | */ |
1a34c8c9 | 801 | static struct page **nfs_readdir_alloc_pages(size_t npages) |
56e4ebf8 | 802 | { |
1a34c8c9 TM |
803 | struct page **pages; |
804 | size_t i; | |
56e4ebf8 | 805 | |
1a34c8c9 TM |
806 | pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL); |
807 | if (!pages) | |
808 | return NULL; | |
56e4ebf8 BS |
809 | for (i = 0; i < npages; i++) { |
810 | struct page *page = alloc_page(GFP_KERNEL); | |
811 | if (page == NULL) | |
812 | goto out_freepages; | |
813 | pages[i] = page; | |
814 | } | |
1a34c8c9 | 815 | return pages; |
56e4ebf8 | 816 | |
56e4ebf8 | 817 | out_freepages: |
c7e9668e | 818 | nfs_readdir_free_pages(pages, i); |
1a34c8c9 | 819 | return NULL; |
1da177e4 LT |
820 | } |
821 | ||
6c981eff | 822 | static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc, |
35df59d3 TM |
823 | __be32 *verf_arg, __be32 *verf_res, |
824 | struct page **arrays, size_t narrays) | |
00a92642 | 825 | { |
1a34c8c9 | 826 | struct page **pages; |
35df59d3 | 827 | struct page *page = *arrays; |
6b75cf9e | 828 | struct nfs_entry *entry; |
1a34c8c9 | 829 | size_t array_size; |
b593c09f | 830 | struct inode *inode = file_inode(desc->file); |
1a34c8c9 | 831 | size_t dtsize = NFS_SERVER(inode)->dtsize; |
8cd51a0c | 832 | int status = -ENOMEM; |
d1bacf9e | 833 | |
6b75cf9e TM |
834 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
835 | if (!entry) | |
836 | return -ENOMEM; | |
837 | entry->cookie = nfs_readdir_page_last_cookie(page); | |
838 | entry->fh = nfs_alloc_fhandle(); | |
839 | entry->fattr = nfs_alloc_fattr(); | |
840 | entry->server = NFS_SERVER(inode); | |
841 | if (entry->fh == NULL || entry->fattr == NULL) | |
d1bacf9e | 842 | goto out; |
00a92642 | 843 | |
6b75cf9e TM |
844 | entry->label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
845 | if (IS_ERR(entry->label)) { | |
846 | status = PTR_ERR(entry->label); | |
14c43f76 DQ |
847 | goto out; |
848 | } | |
849 | ||
1a34c8c9 TM |
850 | array_size = (dtsize + PAGE_SIZE - 1) >> PAGE_SHIFT; |
851 | pages = nfs_readdir_alloc_pages(array_size); | |
852 | if (!pages) | |
e762a639 | 853 | goto out_release_label; |
00a92642 | 854 | |
d1bacf9e | 855 | do { |
ac396128 | 856 | unsigned int pglen; |
b593c09f TM |
857 | status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie, |
858 | pages, dtsize, | |
859 | verf_res); | |
d1bacf9e | 860 | if (status < 0) |
00a92642 | 861 | break; |
972bcdf2 | 862 | |
ac396128 | 863 | pglen = status; |
972bcdf2 TM |
864 | if (pglen == 0) { |
865 | nfs_readdir_page_set_eof(page); | |
8cd51a0c TM |
866 | break; |
867 | } | |
972bcdf2 | 868 | |
ee3707ae NT |
869 | verf_arg = verf_res; |
870 | ||
35df59d3 TM |
871 | status = nfs_readdir_page_filler(desc, entry, pages, pglen, |
872 | arrays, narrays); | |
e762a639 | 873 | } while (!status && nfs_readdir_page_needs_filling(page)); |
d1bacf9e | 874 | |
c7e9668e | 875 | nfs_readdir_free_pages(pages, array_size); |
e762a639 | 876 | out_release_label: |
6b75cf9e | 877 | nfs4_label_free(entry->label); |
d1bacf9e | 878 | out: |
6b75cf9e TM |
879 | nfs_free_fattr(entry->fattr); |
880 | nfs_free_fhandle(entry->fh); | |
881 | kfree(entry); | |
00a92642 OG |
882 | return status; |
883 | } | |
884 | ||
1f1d4aa4 | 885 | static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc) |
1da177e4 | 886 | { |
1f1d4aa4 TM |
887 | put_page(desc->page); |
888 | desc->page = NULL; | |
d1bacf9e | 889 | } |
1da177e4 | 890 | |
1f1d4aa4 TM |
891 | static void |
892 | nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 893 | { |
1f1d4aa4 TM |
894 | unlock_page(desc->page); |
895 | nfs_readdir_page_put(desc); | |
d1bacf9e BS |
896 | } |
897 | ||
1f1d4aa4 TM |
898 | static struct page * |
899 | nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc) | |
d1bacf9e | 900 | { |
1f1d4aa4 TM |
901 | return nfs_readdir_page_get_locked(desc->file->f_mapping, |
902 | desc->page_index, | |
903 | desc->last_cookie); | |
1da177e4 LT |
904 | } |
905 | ||
906 | /* | |
d1bacf9e | 907 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
114de382 | 908 | * and locks the page to prevent removal from the page cache. |
1da177e4 | 909 | */ |
6c981eff | 910 | static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) |
d1bacf9e | 911 | { |
227823d2 DN |
912 | struct inode *inode = file_inode(desc->file); |
913 | struct nfs_inode *nfsi = NFS_I(inode); | |
b593c09f | 914 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
d1bacf9e BS |
915 | int res; |
916 | ||
1f1d4aa4 TM |
917 | desc->page = nfs_readdir_page_get_cached(desc); |
918 | if (!desc->page) | |
919 | return -ENOMEM; | |
920 | if (nfs_readdir_page_needs_filling(desc->page)) { | |
35df59d3 TM |
921 | res = nfs_readdir_xdr_to_array(desc, nfsi->cookieverf, verf, |
922 | &desc->page, 1); | |
9fff59ed TM |
923 | if (res < 0) { |
924 | nfs_readdir_page_unlock_and_put_cached(desc); | |
925 | if (res == -EBADCOOKIE || res == -ENOTSYNC) { | |
926 | invalidate_inode_pages2(desc->file->f_mapping); | |
927 | desc->page_index = 0; | |
928 | return -EAGAIN; | |
929 | } | |
930 | return res; | |
227823d2 | 931 | } |
f892c41c TM |
932 | /* |
933 | * Set the cookie verifier if the page cache was empty | |
934 | */ | |
935 | if (desc->page_index == 0) | |
936 | memcpy(nfsi->cookieverf, verf, | |
937 | sizeof(nfsi->cookieverf)); | |
114de382 | 938 | } |
1f1d4aa4 TM |
939 | res = nfs_readdir_search_array(desc); |
940 | if (res == 0) { | |
941 | nfsi->page_index = desc->page_index; | |
942 | return 0; | |
114de382 | 943 | } |
1f1d4aa4 | 944 | nfs_readdir_page_unlock_and_put_cached(desc); |
d1bacf9e BS |
945 | return res; |
946 | } | |
947 | ||
794092c5 TM |
948 | static bool nfs_readdir_dont_search_cache(struct nfs_readdir_descriptor *desc) |
949 | { | |
950 | struct address_space *mapping = desc->file->f_mapping; | |
951 | struct inode *dir = file_inode(desc->file); | |
952 | unsigned int dtsize = NFS_SERVER(dir)->dtsize; | |
953 | loff_t size = i_size_read(dir); | |
954 | ||
955 | /* | |
956 | * Default to uncached readdir if the page cache is empty, and | |
957 | * we're looking for a non-zero cookie in a large directory. | |
958 | */ | |
959 | return desc->dir_cookie != 0 && mapping->nrpages == 0 && size > dtsize; | |
960 | } | |
961 | ||
d1bacf9e | 962 | /* Search for desc->dir_cookie from the beginning of the page cache */ |
6c981eff | 963 | static int readdir_search_pagecache(struct nfs_readdir_descriptor *desc) |
1da177e4 | 964 | { |
8cd51a0c | 965 | int res; |
d1bacf9e | 966 | |
794092c5 TM |
967 | if (nfs_readdir_dont_search_cache(desc)) |
968 | return -EBADCOOKIE; | |
969 | ||
47c716cb | 970 | do { |
9fff59ed TM |
971 | if (desc->page_index == 0) { |
972 | desc->current_index = 0; | |
973 | desc->prev_index = 0; | |
974 | desc->last_cookie = 0; | |
975 | } | |
114de382 | 976 | res = find_and_lock_cache_page(desc); |
47c716cb | 977 | } while (res == -EAGAIN); |
1da177e4 LT |
978 | return res; |
979 | } | |
980 | ||
1da177e4 LT |
981 | /* |
982 | * Once we've found the start of the dirent within a page: fill 'er up... | |
983 | */ | |
13884ff2 TM |
984 | static void nfs_do_filldir(struct nfs_readdir_descriptor *desc, |
985 | const __be32 *verf) | |
1da177e4 LT |
986 | { |
987 | struct file *file = desc->file; | |
dbeaf8c9 TM |
988 | struct nfs_cache_array *array; |
989 | unsigned int i = 0; | |
8ef2ce3e | 990 | |
0795bf83 | 991 | array = kmap(desc->page); |
d1bacf9e | 992 | for (i = desc->cache_entry_index; i < array->size; i++) { |
ece0b423 | 993 | struct nfs_cache_array_entry *ent; |
1da177e4 | 994 | |
ece0b423 | 995 | ent = &array->array[i]; |
a52a8a6a | 996 | if (!dir_emit(desc->ctx, ent->name, ent->name_len, |
23db8620 | 997 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { |
6089dd0d | 998 | desc->eof = true; |
1da177e4 | 999 | break; |
ece0b423 | 1000 | } |
13884ff2 | 1001 | memcpy(desc->verf, verf, sizeof(desc->verf)); |
d1bacf9e | 1002 | if (i < (array->size-1)) |
2e7a4641 | 1003 | desc->dir_cookie = array->array[i+1].cookie; |
d1bacf9e | 1004 | else |
2e7a4641 | 1005 | desc->dir_cookie = array->last_cookie; |
59e356a9 | 1006 | if (nfs_readdir_use_cookie(file)) |
2e7a4641 | 1007 | desc->ctx->pos = desc->dir_cookie; |
59e356a9 TM |
1008 | else |
1009 | desc->ctx->pos++; | |
2e7a4641 TM |
1010 | if (desc->duped != 0) |
1011 | desc->duped = 1; | |
1da177e4 | 1012 | } |
b1e21c97 | 1013 | if (array->page_is_eof) |
6089dd0d | 1014 | desc->eof = true; |
d1bacf9e | 1015 | |
0795bf83 | 1016 | kunmap(desc->page); |
dbeaf8c9 TM |
1017 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %llu\n", |
1018 | (unsigned long long)desc->dir_cookie); | |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * If we cannot find a cookie in our cache, we suspect that this is | |
1023 | * because it points to a deleted file, so we ask the server to return | |
1024 | * whatever it thinks is the next entry. We then feed this to filldir. | |
1025 | * If all goes well, we should then be able to find our way round the | |
1026 | * cache on the next call to readdir_search_pagecache(); | |
1027 | * | |
1028 | * NOTE: we cannot add the anonymous page to the pagecache because | |
1029 | * the data it contains might not be page aligned. Besides, | |
1030 | * we should already have a complete representation of the | |
1031 | * directory in the page cache by the time we get here. | |
1032 | */ | |
6c981eff | 1033 | static int uncached_readdir(struct nfs_readdir_descriptor *desc) |
1da177e4 | 1034 | { |
35df59d3 TM |
1035 | struct page **arrays; |
1036 | size_t i, sz = 512; | |
b593c09f | 1037 | __be32 verf[NFS_DIR_VERIFIER_SIZE]; |
35df59d3 | 1038 | int status = -ENOMEM; |
1da177e4 | 1039 | |
35df59d3 | 1040 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %llu\n", |
2e7a4641 | 1041 | (unsigned long long)desc->dir_cookie); |
1da177e4 | 1042 | |
35df59d3 TM |
1043 | arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL); |
1044 | if (!arrays) | |
1045 | goto out; | |
1046 | arrays[0] = nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL); | |
1047 | if (!arrays[0]) | |
1da177e4 | 1048 | goto out; |
d1bacf9e | 1049 | |
7a8e1dc3 | 1050 | desc->page_index = 0; |
2e7a4641 | 1051 | desc->last_cookie = desc->dir_cookie; |
2e7a4641 | 1052 | desc->duped = 0; |
7a8e1dc3 | 1053 | |
35df59d3 | 1054 | status = nfs_readdir_xdr_to_array(desc, desc->verf, verf, arrays, sz); |
1da177e4 | 1055 | |
35df59d3 TM |
1056 | for (i = 0; !desc->eof && i < sz && arrays[i]; i++) { |
1057 | desc->page = arrays[i]; | |
13884ff2 | 1058 | nfs_do_filldir(desc, verf); |
35df59d3 TM |
1059 | } |
1060 | desc->page = NULL; | |
1da177e4 | 1061 | |
35df59d3 TM |
1062 | |
1063 | for (i = 0; i < sz && arrays[i]; i++) | |
1064 | nfs_readdir_page_array_free(arrays[i]); | |
1065 | out: | |
1066 | kfree(arrays); | |
1067 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status); | |
1da177e4 | 1068 | return status; |
1da177e4 LT |
1069 | } |
1070 | ||
00a92642 OG |
1071 | /* The file offset position represents the dirent entry number. A |
1072 | last cookie cache takes care of the common case of reading the | |
1073 | whole directory. | |
1da177e4 | 1074 | */ |
23db8620 | 1075 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 1076 | { |
be62a1a8 | 1077 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 1078 | struct inode *inode = d_inode(dentry); |
13884ff2 | 1079 | struct nfs_inode *nfsi = NFS_I(inode); |
23db8620 | 1080 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
6b75cf9e TM |
1081 | struct nfs_readdir_descriptor *desc; |
1082 | int res; | |
1da177e4 | 1083 | |
6de1472f AV |
1084 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
1085 | file, (long long)ctx->pos); | |
91d5b470 CL |
1086 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
1087 | ||
1da177e4 | 1088 | /* |
23db8620 | 1089 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 1090 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
1091 | * to either find the entry with the appropriate number or |
1092 | * revalidate the cookie. | |
1da177e4 | 1093 | */ |
6b75cf9e | 1094 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) { |
07b5ce8e | 1095 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
6b75cf9e TM |
1096 | if (res < 0) |
1097 | goto out; | |
1098 | } | |
1099 | ||
1100 | res = -ENOMEM; | |
1101 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
1102 | if (!desc) | |
fccca7fc | 1103 | goto out; |
6b75cf9e TM |
1104 | desc->file = file; |
1105 | desc->ctx = ctx; | |
1106 | desc->plus = nfs_use_readdirplus(inode, ctx); | |
fccca7fc | 1107 | |
2e7a4641 TM |
1108 | spin_lock(&file->f_lock); |
1109 | desc->dir_cookie = dir_ctx->dir_cookie; | |
1110 | desc->dup_cookie = dir_ctx->dup_cookie; | |
1111 | desc->duped = dir_ctx->duped; | |
1112 | desc->attr_gencount = dir_ctx->attr_gencount; | |
b593c09f | 1113 | memcpy(desc->verf, dir_ctx->verf, sizeof(desc->verf)); |
2e7a4641 | 1114 | spin_unlock(&file->f_lock); |
fccca7fc | 1115 | |
47c716cb | 1116 | do { |
1da177e4 | 1117 | res = readdir_search_pagecache(desc); |
00a92642 | 1118 | |
1da177e4 | 1119 | if (res == -EBADCOOKIE) { |
ece0b423 | 1120 | res = 0; |
1da177e4 | 1121 | /* This means either end of directory */ |
2e7a4641 | 1122 | if (desc->dir_cookie && !desc->eof) { |
1da177e4 | 1123 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 1124 | res = uncached_readdir(desc); |
ece0b423 | 1125 | if (res == 0) |
1da177e4 | 1126 | continue; |
9fff59ed TM |
1127 | if (res == -EBADCOOKIE || res == -ENOTSYNC) |
1128 | res = 0; | |
1da177e4 | 1129 | } |
1da177e4 LT |
1130 | break; |
1131 | } | |
1132 | if (res == -ETOOSMALL && desc->plus) { | |
13884ff2 | 1133 | clear_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); |
1da177e4 | 1134 | nfs_zap_caches(inode); |
baf57a09 | 1135 | desc->page_index = 0; |
a7a3b1e9 BC |
1136 | desc->plus = false; |
1137 | desc->eof = false; | |
1da177e4 LT |
1138 | continue; |
1139 | } | |
1140 | if (res < 0) | |
1141 | break; | |
1142 | ||
13884ff2 | 1143 | nfs_do_filldir(desc, nfsi->cookieverf); |
1f1d4aa4 | 1144 | nfs_readdir_page_unlock_and_put_cached(desc); |
47c716cb | 1145 | } while (!desc->eof); |
2e7a4641 TM |
1146 | |
1147 | spin_lock(&file->f_lock); | |
1148 | dir_ctx->dir_cookie = desc->dir_cookie; | |
1149 | dir_ctx->dup_cookie = desc->dup_cookie; | |
1150 | dir_ctx->duped = desc->duped; | |
1151 | dir_ctx->attr_gencount = desc->attr_gencount; | |
b593c09f | 1152 | memcpy(dir_ctx->verf, desc->verf, sizeof(dir_ctx->verf)); |
2e7a4641 TM |
1153 | spin_unlock(&file->f_lock); |
1154 | ||
6b75cf9e TM |
1155 | kfree(desc); |
1156 | ||
fccca7fc | 1157 | out: |
6de1472f | 1158 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 1159 | return res; |
1da177e4 LT |
1160 | } |
1161 | ||
965c8e59 | 1162 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 1163 | { |
480c2006 | 1164 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 1165 | |
6de1472f AV |
1166 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
1167 | filp, offset, whence); | |
b84e06c5 | 1168 | |
965c8e59 | 1169 | switch (whence) { |
b2b1ff3d TM |
1170 | default: |
1171 | return -EINVAL; | |
1172 | case SEEK_SET: | |
1173 | if (offset < 0) | |
1174 | return -EINVAL; | |
83f2c45e | 1175 | spin_lock(&filp->f_lock); |
b2b1ff3d TM |
1176 | break; |
1177 | case SEEK_CUR: | |
1178 | if (offset == 0) | |
1179 | return filp->f_pos; | |
83f2c45e | 1180 | spin_lock(&filp->f_lock); |
b2b1ff3d TM |
1181 | offset += filp->f_pos; |
1182 | if (offset < 0) { | |
83f2c45e | 1183 | spin_unlock(&filp->f_lock); |
b2b1ff3d TM |
1184 | return -EINVAL; |
1185 | } | |
f0dd2136 TM |
1186 | } |
1187 | if (offset != filp->f_pos) { | |
1188 | filp->f_pos = offset; | |
59e356a9 TM |
1189 | if (nfs_readdir_use_cookie(filp)) |
1190 | dir_ctx->dir_cookie = offset; | |
1191 | else | |
1192 | dir_ctx->dir_cookie = 0; | |
b593c09f TM |
1193 | if (offset == 0) |
1194 | memset(dir_ctx->verf, 0, sizeof(dir_ctx->verf)); | |
8ef2ce3e | 1195 | dir_ctx->duped = 0; |
f0dd2136 | 1196 | } |
83f2c45e | 1197 | spin_unlock(&filp->f_lock); |
f0dd2136 TM |
1198 | return offset; |
1199 | } | |
1200 | ||
1da177e4 LT |
1201 | /* |
1202 | * All directory operations under NFS are synchronous, so fsync() | |
1203 | * is a dummy operation. | |
1204 | */ | |
02c24a82 JB |
1205 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
1206 | int datasync) | |
1da177e4 | 1207 | { |
6de1472f | 1208 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 1209 | |
11decaf8 | 1210 | nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC); |
1da177e4 LT |
1211 | return 0; |
1212 | } | |
1213 | ||
bfc69a45 TM |
1214 | /** |
1215 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
302fad7b | 1216 | * @dir: pointer to directory inode |
bfc69a45 TM |
1217 | * |
1218 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1219 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1220 | * on the server that might have invalidated our dcache. | |
1221 | * | |
efeda80d TM |
1222 | * Note that we reserve bit '0' as a tag to let us know when a dentry |
1223 | * was revalidated while holding a delegation on its inode. | |
1224 | * | |
bfc69a45 TM |
1225 | * The caller should be holding dir->i_lock |
1226 | */ | |
1227 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1228 | { | |
efeda80d | 1229 | NFS_I(dir)->cache_change_attribute += 2; |
bfc69a45 | 1230 | } |
89d77c8f | 1231 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 1232 | |
efeda80d TM |
1233 | /** |
1234 | * nfs_verify_change_attribute - Detects NFS remote directory changes | |
1235 | * @dir: pointer to parent directory inode | |
1236 | * @verf: previously saved change attribute | |
1237 | * | |
1238 | * Return "false" if the verifiers doesn't match the change attribute. | |
1239 | * This would usually indicate that the directory contents have changed on | |
1240 | * the server, and that any dentries need revalidating. | |
1241 | */ | |
1242 | static bool nfs_verify_change_attribute(struct inode *dir, unsigned long verf) | |
1243 | { | |
1244 | return (verf & ~1UL) == nfs_save_change_attribute(dir); | |
1245 | } | |
1246 | ||
1247 | static void nfs_set_verifier_delegated(unsigned long *verf) | |
1248 | { | |
1249 | *verf |= 1UL; | |
1250 | } | |
1251 | ||
1252 | #if IS_ENABLED(CONFIG_NFS_V4) | |
1253 | static void nfs_unset_verifier_delegated(unsigned long *verf) | |
1254 | { | |
1255 | *verf &= ~1UL; | |
1256 | } | |
1257 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ | |
1258 | ||
1259 | static bool nfs_test_verifier_delegated(unsigned long verf) | |
1260 | { | |
1261 | return verf & 1; | |
1262 | } | |
1263 | ||
1264 | static bool nfs_verifier_is_delegated(struct dentry *dentry) | |
1265 | { | |
1266 | return nfs_test_verifier_delegated(dentry->d_time); | |
1267 | } | |
1268 | ||
1269 | static void nfs_set_verifier_locked(struct dentry *dentry, unsigned long verf) | |
1270 | { | |
1271 | struct inode *inode = d_inode(dentry); | |
1272 | ||
1273 | if (!nfs_verifier_is_delegated(dentry) && | |
1274 | !nfs_verify_change_attribute(d_inode(dentry->d_parent), verf)) | |
1275 | goto out; | |
1276 | if (inode && NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) | |
1277 | nfs_set_verifier_delegated(&verf); | |
1278 | out: | |
1279 | dentry->d_time = verf; | |
1280 | } | |
1281 | ||
1282 | /** | |
1283 | * nfs_set_verifier - save a parent directory verifier in the dentry | |
1284 | * @dentry: pointer to dentry | |
1285 | * @verf: verifier to save | |
1286 | * | |
1287 | * Saves the parent directory verifier in @dentry. If the inode has | |
1288 | * a delegation, we also tag the dentry as having been revalidated | |
1289 | * while holding a delegation so that we know we don't have to | |
1290 | * look it up again after a directory change. | |
1291 | */ | |
1292 | void nfs_set_verifier(struct dentry *dentry, unsigned long verf) | |
1293 | { | |
1294 | ||
1295 | spin_lock(&dentry->d_lock); | |
1296 | nfs_set_verifier_locked(dentry, verf); | |
1297 | spin_unlock(&dentry->d_lock); | |
1298 | } | |
1299 | EXPORT_SYMBOL_GPL(nfs_set_verifier); | |
1300 | ||
1301 | #if IS_ENABLED(CONFIG_NFS_V4) | |
1302 | /** | |
1303 | * nfs_clear_verifier_delegated - clear the dir verifier delegation tag | |
1304 | * @inode: pointer to inode | |
1305 | * | |
1306 | * Iterates through the dentries in the inode alias list and clears | |
1307 | * the tag used to indicate that the dentry has been revalidated | |
1308 | * while holding a delegation. | |
1309 | * This function is intended for use when the delegation is being | |
1310 | * returned or revoked. | |
1311 | */ | |
1312 | void nfs_clear_verifier_delegated(struct inode *inode) | |
1313 | { | |
1314 | struct dentry *alias; | |
1315 | ||
1316 | if (!inode) | |
1317 | return; | |
1318 | spin_lock(&inode->i_lock); | |
1319 | hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { | |
1320 | spin_lock(&alias->d_lock); | |
1321 | nfs_unset_verifier_delegated(&alias->d_time); | |
1322 | spin_unlock(&alias->d_lock); | |
1323 | } | |
1324 | spin_unlock(&inode->i_lock); | |
1325 | } | |
1326 | EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated); | |
1327 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ | |
1328 | ||
1da177e4 LT |
1329 | /* |
1330 | * A check for whether or not the parent directory has changed. | |
1331 | * In the case it has, we assume that the dentries are untrustworthy | |
1332 | * and may need to be looked up again. | |
912a108d | 1333 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 1334 | */ |
912a108d N |
1335 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
1336 | int rcu_walk) | |
1da177e4 LT |
1337 | { |
1338 | if (IS_ROOT(dentry)) | |
1339 | return 1; | |
4eec952e TM |
1340 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1341 | return 0; | |
f2c77f4e TM |
1342 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1343 | return 0; | |
1344 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1cd9cb05 TM |
1345 | if (nfs_mapping_need_revalidate_inode(dir)) { |
1346 | if (rcu_walk) | |
1347 | return 0; | |
1348 | if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1349 | return 0; | |
1350 | } | |
f2c77f4e TM |
1351 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1352 | return 0; | |
1353 | return 1; | |
1da177e4 LT |
1354 | } |
1355 | ||
a12802ca TM |
1356 | /* |
1357 | * Use intent information to check whether or not we're going to do | |
1358 | * an O_EXCL create using this path component. | |
1359 | */ | |
fa3c56bb | 1360 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1361 | { |
1362 | if (NFS_PROTO(dir)->version == 2) | |
1363 | return 0; | |
fa3c56bb | 1364 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1365 | } |
1366 | ||
1d6757fb TM |
1367 | /* |
1368 | * Inode and filehandle revalidation for lookups. | |
1369 | * | |
1370 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1371 | * or if the intent information indicates that we're about to open this | |
1372 | * particular file and the "nocto" mount flag is not set. | |
1373 | * | |
1374 | */ | |
65a0c149 | 1375 | static |
fa3c56bb | 1376 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1377 | { |
1378 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1379 | int ret; |
1da177e4 | 1380 | |
36d43a43 | 1381 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1382 | return 0; |
47921921 TM |
1383 | |
1384 | if (flags & LOOKUP_OPEN) { | |
1385 | switch (inode->i_mode & S_IFMT) { | |
1386 | case S_IFREG: | |
1387 | /* A NFSv4 OPEN will revalidate later */ | |
1388 | if (server->caps & NFS_CAP_ATOMIC_OPEN) | |
1389 | goto out; | |
df561f66 | 1390 | fallthrough; |
47921921 TM |
1391 | case S_IFDIR: |
1392 | if (server->flags & NFS_MOUNT_NOCTO) | |
1393 | break; | |
1394 | /* NFS close-to-open cache consistency validation */ | |
1395 | goto out_force; | |
1396 | } | |
1397 | } | |
1398 | ||
facc3530 | 1399 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1400 | if (flags & LOOKUP_REVAL) |
facc3530 | 1401 | goto out_force; |
65a0c149 | 1402 | out: |
a61246c9 | 1403 | return (inode->i_nlink == 0) ? -ESTALE : 0; |
1da177e4 | 1404 | out_force: |
1fa1e384 N |
1405 | if (flags & LOOKUP_RCU) |
1406 | return -ECHILD; | |
65a0c149 TM |
1407 | ret = __nfs_revalidate_inode(server, inode); |
1408 | if (ret != 0) | |
1409 | return ret; | |
1410 | goto out; | |
1da177e4 LT |
1411 | } |
1412 | ||
82e7ca13 TM |
1413 | static void nfs_mark_dir_for_revalidate(struct inode *inode) |
1414 | { | |
82e7ca13 | 1415 | spin_lock(&inode->i_lock); |
fd6d3fee | 1416 | nfs_set_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE); |
82e7ca13 TM |
1417 | spin_unlock(&inode->i_lock); |
1418 | } | |
1419 | ||
1da177e4 LT |
1420 | /* |
1421 | * We judge how long we want to trust negative | |
1422 | * dentries by looking at the parent inode mtime. | |
1423 | * | |
1424 | * If parent mtime has changed, we revalidate, else we wait for a | |
1425 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1426 | * |
1427 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1428 | * suggesting a reval is needed. | |
9f6d44d4 TM |
1429 | * |
1430 | * Note that when creating a new file, or looking up a rename target, | |
1431 | * then it shouldn't be necessary to revalidate a negative dentry. | |
1da177e4 LT |
1432 | */ |
1433 | static inline | |
1434 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1435 | unsigned int flags) |
1da177e4 | 1436 | { |
9f6d44d4 | 1437 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
1da177e4 | 1438 | return 0; |
4eec952e TM |
1439 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1440 | return 1; | |
912a108d | 1441 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1442 | } |
1443 | ||
5ceb9d7f TM |
1444 | static int |
1445 | nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, | |
1446 | struct inode *inode, int error) | |
1447 | { | |
1448 | switch (error) { | |
1449 | case 1: | |
1450 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", | |
1451 | __func__, dentry); | |
1452 | return 1; | |
1453 | case 0: | |
47397915 TM |
1454 | /* |
1455 | * We can't d_drop the root of a disconnected tree: | |
1456 | * its d_hash is on the s_anon list and d_drop() would hide | |
1457 | * it from shrink_dcache_for_unmount(), leading to busy | |
1458 | * inodes on unmount and further oopses. | |
1459 | */ | |
1460 | if (inode && IS_ROOT(dentry)) | |
1461 | return 1; | |
5ceb9d7f TM |
1462 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", |
1463 | __func__, dentry); | |
1464 | return 0; | |
1465 | } | |
1466 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", | |
1467 | __func__, dentry, error); | |
1468 | return error; | |
1469 | } | |
1470 | ||
1471 | static int | |
1472 | nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, | |
1473 | unsigned int flags) | |
1474 | { | |
1475 | int ret = 1; | |
1476 | if (nfs_neg_need_reval(dir, dentry, flags)) { | |
1477 | if (flags & LOOKUP_RCU) | |
1478 | return -ECHILD; | |
1479 | ret = 0; | |
1480 | } | |
1481 | return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); | |
1482 | } | |
1483 | ||
1484 | static int | |
1485 | nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, | |
1486 | struct inode *inode) | |
1487 | { | |
1488 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1489 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1490 | } | |
1491 | ||
1492 | static int | |
1493 | nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, | |
1494 | struct inode *inode) | |
1495 | { | |
1496 | struct nfs_fh *fhandle; | |
1497 | struct nfs_fattr *fattr; | |
1498 | struct nfs4_label *label; | |
a1147b82 | 1499 | unsigned long dir_verifier; |
5ceb9d7f TM |
1500 | int ret; |
1501 | ||
1502 | ret = -ENOMEM; | |
1503 | fhandle = nfs_alloc_fhandle(); | |
1504 | fattr = nfs_alloc_fattr(); | |
1505 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); | |
1506 | if (fhandle == NULL || fattr == NULL || IS_ERR(label)) | |
1507 | goto out; | |
1508 | ||
a1147b82 | 1509 | dir_verifier = nfs_save_change_attribute(dir); |
f7b37b8b | 1510 | ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); |
5ceb9d7f | 1511 | if (ret < 0) { |
f7b37b8b TM |
1512 | switch (ret) { |
1513 | case -ESTALE: | |
1514 | case -ENOENT: | |
5ceb9d7f | 1515 | ret = 0; |
f7b37b8b TM |
1516 | break; |
1517 | case -ETIMEDOUT: | |
1518 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) | |
1519 | ret = 1; | |
1520 | } | |
5ceb9d7f TM |
1521 | goto out; |
1522 | } | |
1523 | ret = 0; | |
1524 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) | |
1525 | goto out; | |
1526 | if (nfs_refresh_inode(inode, fattr) < 0) | |
1527 | goto out; | |
1528 | ||
1529 | nfs_setsecurity(inode, fattr, label); | |
a1147b82 | 1530 | nfs_set_verifier(dentry, dir_verifier); |
5ceb9d7f TM |
1531 | |
1532 | /* set a readdirplus hint that we had a cache miss */ | |
1533 | nfs_force_use_readdirplus(dir); | |
1534 | ret = 1; | |
1535 | out: | |
1536 | nfs_free_fattr(fattr); | |
1537 | nfs_free_fhandle(fhandle); | |
1538 | nfs4_label_free(label); | |
82e7ca13 TM |
1539 | |
1540 | /* | |
1541 | * If the lookup failed despite the dentry change attribute being | |
1542 | * a match, then we should revalidate the directory cache. | |
1543 | */ | |
1544 | if (!ret && nfs_verify_change_attribute(dir, dentry->d_time)) | |
1545 | nfs_mark_dir_for_revalidate(dir); | |
5ceb9d7f TM |
1546 | return nfs_lookup_revalidate_done(dir, dentry, inode, ret); |
1547 | } | |
1548 | ||
1da177e4 LT |
1549 | /* |
1550 | * This is called every time the dcache has a lookup hit, | |
1551 | * and we should check whether we can really trust that | |
1552 | * lookup. | |
1553 | * | |
1554 | * NOTE! The hit can be a negative hit too, don't assume | |
1555 | * we have an inode! | |
1556 | * | |
1557 | * If the parent directory is seen to have changed, we throw out the | |
1558 | * cached dentry and do a new lookup. | |
1559 | */ | |
5ceb9d7f TM |
1560 | static int |
1561 | nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
1562 | unsigned int flags) | |
1da177e4 | 1563 | { |
1da177e4 | 1564 | struct inode *inode; |
1da177e4 | 1565 | int error; |
1da177e4 | 1566 | |
91d5b470 | 1567 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
2b0143b5 | 1568 | inode = d_inode(dentry); |
1da177e4 | 1569 | |
5ceb9d7f TM |
1570 | if (!inode) |
1571 | return nfs_lookup_revalidate_negative(dir, dentry, flags); | |
1da177e4 LT |
1572 | |
1573 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1574 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1575 | __func__, dentry); | |
1da177e4 LT |
1576 | goto out_bad; |
1577 | } | |
1578 | ||
efeda80d | 1579 | if (nfs_verifier_is_delegated(dentry)) |
5ceb9d7f | 1580 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); |
15860ab1 | 1581 | |
1da177e4 | 1582 | /* Force a full look up iff the parent directory has changed */ |
73dd684a | 1583 | if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && |
912a108d | 1584 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { |
cc89684c N |
1585 | error = nfs_lookup_verify_inode(inode, flags); |
1586 | if (error) { | |
cc89684c | 1587 | if (error == -ESTALE) |
82e7ca13 | 1588 | nfs_mark_dir_for_revalidate(dir); |
5ceb9d7f | 1589 | goto out_bad; |
1fa1e384 | 1590 | } |
63519fbc | 1591 | nfs_advise_use_readdirplus(dir); |
1da177e4 LT |
1592 | goto out_valid; |
1593 | } | |
1594 | ||
912a108d N |
1595 | if (flags & LOOKUP_RCU) |
1596 | return -ECHILD; | |
1597 | ||
1da177e4 LT |
1598 | if (NFS_STALE(inode)) |
1599 | goto out_bad; | |
1600 | ||
6e0d0be7 | 1601 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
5ceb9d7f | 1602 | error = nfs_lookup_revalidate_dentry(dir, dentry, inode); |
6e0d0be7 | 1603 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
5ceb9d7f TM |
1604 | return error; |
1605 | out_valid: | |
1606 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1607 | out_bad: | |
1608 | if (flags & LOOKUP_RCU) | |
1609 | return -ECHILD; | |
1610 | return nfs_lookup_revalidate_done(dir, dentry, inode, 0); | |
1611 | } | |
14c43f76 | 1612 | |
5ceb9d7f | 1613 | static int |
c7944ebb TM |
1614 | __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, |
1615 | int (*reval)(struct inode *, struct dentry *, unsigned int)) | |
5ceb9d7f TM |
1616 | { |
1617 | struct dentry *parent; | |
1618 | struct inode *dir; | |
1619 | int ret; | |
63519fbc | 1620 | |
d51ac1a8 | 1621 | if (flags & LOOKUP_RCU) { |
5ceb9d7f TM |
1622 | parent = READ_ONCE(dentry->d_parent); |
1623 | dir = d_inode_rcu(parent); | |
1624 | if (!dir) | |
1625 | return -ECHILD; | |
c7944ebb | 1626 | ret = reval(dir, dentry, flags); |
6aa7de05 | 1627 | if (parent != READ_ONCE(dentry->d_parent)) |
d51ac1a8 | 1628 | return -ECHILD; |
5ceb9d7f TM |
1629 | } else { |
1630 | parent = dget_parent(dentry); | |
c7944ebb | 1631 | ret = reval(d_inode(parent), dentry, flags); |
d51ac1a8 | 1632 | dput(parent); |
1da177e4 | 1633 | } |
5ceb9d7f | 1634 | return ret; |
1da177e4 LT |
1635 | } |
1636 | ||
c7944ebb TM |
1637 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1638 | { | |
1639 | return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); | |
1640 | } | |
1641 | ||
ecf3d1f1 | 1642 | /* |
2b0143b5 | 1643 | * A weaker form of d_revalidate for revalidating just the d_inode(dentry) |
ecf3d1f1 JL |
1644 | * when we don't really care about the dentry name. This is called when a |
1645 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1646 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1647 | * | |
1648 | * In this situation, we just want to verify that the inode itself is OK | |
1649 | * since the dentry might have changed on the server. | |
1650 | */ | |
1651 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1652 | { | |
2b0143b5 | 1653 | struct inode *inode = d_inode(dentry); |
9cdd1d3f | 1654 | int error = 0; |
ecf3d1f1 JL |
1655 | |
1656 | /* | |
1657 | * I believe we can only get a negative dentry here in the case of a | |
1658 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1659 | * eventually need to do something more here. | |
1660 | */ | |
1661 | if (!inode) { | |
6de1472f AV |
1662 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1663 | __func__, dentry); | |
ecf3d1f1 JL |
1664 | return 1; |
1665 | } | |
1666 | ||
1667 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1668 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1669 | __func__, dentry); | |
ecf3d1f1 JL |
1670 | return 0; |
1671 | } | |
1672 | ||
b688741c | 1673 | error = nfs_lookup_verify_inode(inode, flags); |
ecf3d1f1 JL |
1674 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", |
1675 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1676 | return !error; | |
1677 | } | |
1678 | ||
1da177e4 LT |
1679 | /* |
1680 | * This is called from dput() when d_count is going to 0. | |
1681 | */ | |
fe15ce44 | 1682 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1683 | { |
6de1472f AV |
1684 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1685 | dentry, dentry->d_flags); | |
1da177e4 | 1686 | |
77f11192 | 1687 | /* Unhash any dentry with a stale inode */ |
2b0143b5 | 1688 | if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) |
77f11192 TM |
1689 | return 1; |
1690 | ||
1da177e4 LT |
1691 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1692 | /* Unhash it, so that ->d_iput() would be called */ | |
1693 | return 1; | |
1694 | } | |
1751e8a6 | 1695 | if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { |
1da177e4 LT |
1696 | /* Unhash it, so that ancestors of killed async unlink |
1697 | * files will be cleaned up during umount */ | |
1698 | return 1; | |
1699 | } | |
1700 | return 0; | |
1701 | ||
1702 | } | |
1703 | ||
1f018458 | 1704 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1705 | static void nfs_drop_nlink(struct inode *inode) |
1706 | { | |
1707 | spin_lock(&inode->i_lock); | |
1f018458 | 1708 | /* drop the inode if we're reasonably sure this is the last link */ |
59a707b0 TM |
1709 | if (inode->i_nlink > 0) |
1710 | drop_nlink(inode); | |
1711 | NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
ac46b3d7 TM |
1712 | nfs_set_cache_invalid( |
1713 | inode, NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | | |
1301e421 | 1714 | NFS_INO_INVALID_NLINK); |
1b83d707 TM |
1715 | spin_unlock(&inode->i_lock); |
1716 | } | |
1717 | ||
1da177e4 LT |
1718 | /* |
1719 | * Called when the dentry loses inode. | |
1720 | * We use it to clean up silly-renamed files. | |
1721 | */ | |
1722 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1723 | { | |
83672d39 NB |
1724 | if (S_ISDIR(inode->i_mode)) |
1725 | /* drop any readdir cache as it could easily be old */ | |
ac46b3d7 | 1726 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); |
83672d39 | 1727 | |
1da177e4 | 1728 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1729 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1730 | nfs_drop_nlink(inode); |
1da177e4 | 1731 | } |
1da177e4 LT |
1732 | iput(inode); |
1733 | } | |
1734 | ||
b1942c5f AV |
1735 | static void nfs_d_release(struct dentry *dentry) |
1736 | { | |
1737 | /* free cached devname value, if it survived that far */ | |
1738 | if (unlikely(dentry->d_fsdata)) { | |
1739 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1740 | WARN_ON(1); | |
1741 | else | |
1742 | kfree(dentry->d_fsdata); | |
1743 | } | |
1744 | } | |
1745 | ||
f786aa90 | 1746 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1747 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1748 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1749 | .d_delete = nfs_dentry_delete, |
1750 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1751 | .d_automount = nfs_d_automount, |
b1942c5f | 1752 | .d_release = nfs_d_release, |
1da177e4 | 1753 | }; |
ddda8e0a | 1754 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1755 | |
597d9289 | 1756 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1757 | { |
1758 | struct dentry *res; | |
1759 | struct inode *inode = NULL; | |
e1fb4d05 TM |
1760 | struct nfs_fh *fhandle = NULL; |
1761 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1762 | struct nfs4_label *label = NULL; |
a1147b82 | 1763 | unsigned long dir_verifier; |
1da177e4 | 1764 | int error; |
1da177e4 | 1765 | |
6de1472f | 1766 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1767 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 | 1768 | |
130f9ab7 AV |
1769 | if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) |
1770 | return ERR_PTR(-ENAMETOOLONG); | |
1da177e4 | 1771 | |
fd684071 TM |
1772 | /* |
1773 | * If we're doing an exclusive create, optimize away the lookup | |
1774 | * but don't hash the dentry. | |
1775 | */ | |
9f6d44d4 | 1776 | if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) |
130f9ab7 | 1777 | return NULL; |
1da177e4 | 1778 | |
e1fb4d05 TM |
1779 | res = ERR_PTR(-ENOMEM); |
1780 | fhandle = nfs_alloc_fhandle(); | |
1781 | fattr = nfs_alloc_fattr(); | |
1782 | if (fhandle == NULL || fattr == NULL) | |
1783 | goto out; | |
1784 | ||
14c43f76 DQ |
1785 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1786 | if (IS_ERR(label)) | |
1787 | goto out; | |
1788 | ||
a1147b82 | 1789 | dir_verifier = nfs_save_change_attribute(dir); |
6e0d0be7 | 1790 | trace_nfs_lookup_enter(dir, dentry, flags); |
f7b37b8b | 1791 | error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); |
1da177e4 LT |
1792 | if (error == -ENOENT) |
1793 | goto no_entry; | |
1794 | if (error < 0) { | |
1795 | res = ERR_PTR(error); | |
bf130914 | 1796 | goto out_label; |
1da177e4 | 1797 | } |
1775fd3e | 1798 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1799 | res = ERR_CAST(inode); |
03f28e3a | 1800 | if (IS_ERR(res)) |
bf130914 | 1801 | goto out_label; |
54ceac45 | 1802 | |
63519fbc TM |
1803 | /* Notify readdir to use READDIRPLUS */ |
1804 | nfs_force_use_readdirplus(dir); | |
d69ee9b8 | 1805 | |
1da177e4 | 1806 | no_entry: |
41d28bca | 1807 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1808 | if (res != NULL) { |
1809 | if (IS_ERR(res)) | |
bf130914 | 1810 | goto out_label; |
1da177e4 | 1811 | dentry = res; |
9eaef27b | 1812 | } |
a1147b82 | 1813 | nfs_set_verifier(dentry, dir_verifier); |
bf130914 | 1814 | out_label: |
6e0d0be7 | 1815 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1816 | nfs4_label_free(label); |
1da177e4 | 1817 | out: |
e1fb4d05 TM |
1818 | nfs_free_fattr(fattr); |
1819 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1820 | return res; |
1821 | } | |
ddda8e0a | 1822 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1823 | |
89d77c8f | 1824 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1825 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1826 | |
f786aa90 | 1827 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1828 | .d_revalidate = nfs4_lookup_revalidate, |
b688741c | 1829 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1830 | .d_delete = nfs_dentry_delete, |
1831 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1832 | .d_automount = nfs_d_automount, |
b1942c5f | 1833 | .d_release = nfs_d_release, |
1da177e4 | 1834 | }; |
89d77c8f | 1835 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1836 | |
8a5e929d AV |
1837 | static fmode_t flags_to_mode(int flags) |
1838 | { | |
1839 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1840 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1841 | res |= FMODE_READ; | |
1842 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1843 | res |= FMODE_WRITE; | |
1844 | return res; | |
1845 | } | |
1846 | ||
532d4def | 1847 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) |
cd9a1c0e | 1848 | { |
532d4def | 1849 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); |
cd9a1c0e TM |
1850 | } |
1851 | ||
1852 | static int do_open(struct inode *inode, struct file *filp) | |
1853 | { | |
f1fe29b4 | 1854 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1855 | return 0; |
1856 | } | |
1857 | ||
d9585277 AV |
1858 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1859 | struct dentry *dentry, | |
b452a458 | 1860 | struct file *file, unsigned open_flags) |
cd9a1c0e | 1861 | { |
0dd2b474 MS |
1862 | int err; |
1863 | ||
be12af3e | 1864 | err = finish_open(file, dentry, do_open); |
30d90494 | 1865 | if (err) |
d9585277 | 1866 | goto out; |
eaa2b82c N |
1867 | if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) |
1868 | nfs_file_set_open_context(file, ctx); | |
1869 | else | |
9821421a | 1870 | err = -EOPENSTALE; |
cd9a1c0e | 1871 | out: |
d9585277 | 1872 | return err; |
cd9a1c0e TM |
1873 | } |
1874 | ||
73a79706 BS |
1875 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1876 | struct file *file, unsigned open_flags, | |
44907d79 | 1877 | umode_t mode) |
1da177e4 | 1878 | { |
c94c0953 | 1879 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
cd9a1c0e | 1880 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1881 | struct dentry *res; |
1882 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1883 | struct inode *inode; |
1472b83e | 1884 | unsigned int lookup_flags = 0; |
c94c0953 | 1885 | bool switched = false; |
73a09dd9 | 1886 | int created = 0; |
898f635c | 1887 | int err; |
1da177e4 | 1888 | |
0dd2b474 | 1889 | /* Expect a negative dentry */ |
2b0143b5 | 1890 | BUG_ON(d_inode(dentry)); |
0dd2b474 | 1891 | |
1e8968c5 | 1892 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1893 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1894 | |
9597c13b JL |
1895 | err = nfs_check_flags(open_flags); |
1896 | if (err) | |
1897 | return err; | |
1898 | ||
0dd2b474 MS |
1899 | /* NFS only supports OPEN on regular files */ |
1900 | if ((open_flags & O_DIRECTORY)) { | |
00699ad8 | 1901 | if (!d_in_lookup(dentry)) { |
0dd2b474 MS |
1902 | /* |
1903 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1904 | * revalidated and is fine, no need to perform lookup | |
1905 | * again | |
1906 | */ | |
d9585277 | 1907 | return -ENOENT; |
0dd2b474 | 1908 | } |
1472b83e | 1909 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1910 | goto no_open; |
02a913a7 | 1911 | } |
1da177e4 | 1912 | |
0dd2b474 | 1913 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1914 | return -ENAMETOOLONG; |
cd9a1c0e | 1915 | |
0dd2b474 | 1916 | if (open_flags & O_CREAT) { |
dff25ddb AG |
1917 | struct nfs_server *server = NFS_SERVER(dir); |
1918 | ||
1919 | if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) | |
1920 | mode &= ~current_umask(); | |
1921 | ||
536e43d1 | 1922 | attr.ia_valid |= ATTR_MODE; |
dff25ddb | 1923 | attr.ia_mode = mode; |
0dd2b474 | 1924 | } |
536e43d1 TM |
1925 | if (open_flags & O_TRUNC) { |
1926 | attr.ia_valid |= ATTR_SIZE; | |
1927 | attr.ia_size = 0; | |
cd9a1c0e TM |
1928 | } |
1929 | ||
c94c0953 AV |
1930 | if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { |
1931 | d_drop(dentry); | |
1932 | switched = true; | |
1933 | dentry = d_alloc_parallel(dentry->d_parent, | |
1934 | &dentry->d_name, &wq); | |
1935 | if (IS_ERR(dentry)) | |
1936 | return PTR_ERR(dentry); | |
1937 | if (unlikely(!d_in_lookup(dentry))) | |
1938 | return finish_no_open(file, dentry); | |
1939 | } | |
1940 | ||
532d4def | 1941 | ctx = create_nfs_open_context(dentry, open_flags, file); |
0dd2b474 MS |
1942 | err = PTR_ERR(ctx); |
1943 | if (IS_ERR(ctx)) | |
d9585277 | 1944 | goto out; |
0dd2b474 | 1945 | |
6e0d0be7 | 1946 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
73a09dd9 AV |
1947 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); |
1948 | if (created) | |
1949 | file->f_mode |= FMODE_CREATED; | |
f46e0bd3 | 1950 | if (IS_ERR(inode)) { |
0dd2b474 | 1951 | err = PTR_ERR(inode); |
6e0d0be7 | 1952 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1953 | put_nfs_open_context(ctx); |
d20cb71d | 1954 | d_drop(dentry); |
0dd2b474 MS |
1955 | switch (err) { |
1956 | case -ENOENT: | |
774d9513 | 1957 | d_splice_alias(NULL, dentry); |
809fd143 | 1958 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1959 | break; |
1960 | case -EISDIR: | |
1961 | case -ENOTDIR: | |
1962 | goto no_open; | |
1963 | case -ELOOP: | |
1964 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1965 | goto no_open; |
0dd2b474 | 1966 | break; |
1da177e4 | 1967 | /* case -EINVAL: */ |
0dd2b474 MS |
1968 | default: |
1969 | break; | |
1da177e4 | 1970 | } |
d9585277 | 1971 | goto out; |
cd9a1c0e | 1972 | } |
0dd2b474 | 1973 | |
b452a458 | 1974 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); |
6e0d0be7 | 1975 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1976 | put_nfs_open_context(ctx); |
d9585277 | 1977 | out: |
c94c0953 AV |
1978 | if (unlikely(switched)) { |
1979 | d_lookup_done(dentry); | |
1980 | dput(dentry); | |
1981 | } | |
d9585277 | 1982 | return err; |
0dd2b474 | 1983 | |
1da177e4 | 1984 | no_open: |
1472b83e | 1985 | res = nfs_lookup(dir, dentry, lookup_flags); |
c94c0953 AV |
1986 | if (switched) { |
1987 | d_lookup_done(dentry); | |
1988 | if (!res) | |
1989 | res = dentry; | |
1990 | else | |
1991 | dput(dentry); | |
1992 | } | |
0dd2b474 | 1993 | if (IS_ERR(res)) |
c94c0953 | 1994 | return PTR_ERR(res); |
e45198a6 | 1995 | return finish_no_open(file, res); |
1da177e4 | 1996 | } |
89d77c8f | 1997 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1998 | |
c7944ebb TM |
1999 | static int |
2000 | nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
2001 | unsigned int flags) | |
1da177e4 | 2002 | { |
657e94b6 | 2003 | struct inode *inode; |
1da177e4 | 2004 | |
fa3c56bb | 2005 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
c7944ebb | 2006 | goto full_reval; |
eda72afb | 2007 | if (d_mountpoint(dentry)) |
c7944ebb | 2008 | goto full_reval; |
2b484297 | 2009 | |
2b0143b5 | 2010 | inode = d_inode(dentry); |
2b484297 | 2011 | |
1da177e4 LT |
2012 | /* We can't create new files in nfs_open_revalidate(), so we |
2013 | * optimize away revalidation of negative dentries. | |
2014 | */ | |
c7944ebb TM |
2015 | if (inode == NULL) |
2016 | goto full_reval; | |
2017 | ||
efeda80d | 2018 | if (nfs_verifier_is_delegated(dentry)) |
c7944ebb | 2019 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); |
216d5d06 | 2020 | |
1da177e4 LT |
2021 | /* NFS only supports OPEN on regular files */ |
2022 | if (!S_ISREG(inode->i_mode)) | |
c7944ebb TM |
2023 | goto full_reval; |
2024 | ||
1da177e4 | 2025 | /* We cannot do exclusive creation on a positive dentry */ |
c7944ebb TM |
2026 | if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) |
2027 | goto reval_dentry; | |
2028 | ||
2029 | /* Check if the directory changed */ | |
2030 | if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) | |
2031 | goto reval_dentry; | |
1da177e4 | 2032 | |
0ef97dcf | 2033 | /* Let f_op->open() actually open (and revalidate) the file */ |
c7944ebb TM |
2034 | return 1; |
2035 | reval_dentry: | |
2036 | if (flags & LOOKUP_RCU) | |
2037 | return -ECHILD; | |
42f72cf3 | 2038 | return nfs_lookup_revalidate_dentry(dir, dentry, inode); |
536e43d1 | 2039 | |
c7944ebb TM |
2040 | full_reval: |
2041 | return nfs_do_lookup_revalidate(dir, dentry, flags); | |
2042 | } | |
535918f1 | 2043 | |
c7944ebb TM |
2044 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
2045 | { | |
2046 | return __nfs_lookup_revalidate(dentry, flags, | |
2047 | nfs4_do_lookup_revalidate); | |
c0204fd2 TM |
2048 | } |
2049 | ||
1da177e4 LT |
2050 | #endif /* CONFIG_NFSV4 */ |
2051 | ||
406cd915 BC |
2052 | struct dentry * |
2053 | nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
2054 | struct nfs_fattr *fattr, |
2055 | struct nfs4_label *label) | |
1da177e4 | 2056 | { |
fab728e1 | 2057 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 2058 | struct inode *dir = d_inode(parent); |
1da177e4 | 2059 | struct inode *inode; |
b0c6108e | 2060 | struct dentry *d; |
406cd915 | 2061 | int error; |
1da177e4 | 2062 | |
fab728e1 TM |
2063 | d_drop(dentry); |
2064 | ||
1da177e4 | 2065 | if (fhandle->size == 0) { |
f7b37b8b | 2066 | error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, NULL); |
1da177e4 | 2067 | if (error) |
fab728e1 | 2068 | goto out_error; |
1da177e4 | 2069 | } |
5724ab37 | 2070 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
2071 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
2072 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
a841b54d TM |
2073 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, |
2074 | fattr, NULL, NULL); | |
1da177e4 | 2075 | if (error < 0) |
fab728e1 | 2076 | goto out_error; |
1da177e4 | 2077 | } |
1775fd3e | 2078 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
b0c6108e | 2079 | d = d_splice_alias(inode, dentry); |
fab728e1 TM |
2080 | out: |
2081 | dput(parent); | |
406cd915 | 2082 | return d; |
fab728e1 | 2083 | out_error: |
406cd915 BC |
2084 | d = ERR_PTR(error); |
2085 | goto out; | |
2086 | } | |
2087 | EXPORT_SYMBOL_GPL(nfs_add_or_obtain); | |
2088 | ||
2089 | /* | |
2090 | * Code common to create, mkdir, and mknod. | |
2091 | */ | |
2092 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
2093 | struct nfs_fattr *fattr, | |
2094 | struct nfs4_label *label) | |
2095 | { | |
2096 | struct dentry *d; | |
2097 | ||
2098 | d = nfs_add_or_obtain(dentry, fhandle, fattr, label); | |
2099 | if (IS_ERR(d)) | |
2100 | return PTR_ERR(d); | |
2101 | ||
2102 | /* Callers don't care */ | |
2103 | dput(d); | |
2104 | return 0; | |
1da177e4 | 2105 | } |
ddda8e0a | 2106 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
2107 | |
2108 | /* | |
2109 | * Following a failed create operation, we drop the dentry rather | |
2110 | * than retain a negative dentry. This avoids a problem in the event | |
2111 | * that the operation succeeded on the server, but an error in the | |
2112 | * reply path made it appear to have failed. | |
2113 | */ | |
549c7297 CB |
2114 | int nfs_create(struct user_namespace *mnt_userns, struct inode *dir, |
2115 | struct dentry *dentry, umode_t mode, bool excl) | |
1da177e4 LT |
2116 | { |
2117 | struct iattr attr; | |
ebfc3b49 | 2118 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 2119 | int error; |
1da177e4 | 2120 | |
1e8968c5 | 2121 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 2122 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
2123 | |
2124 | attr.ia_mode = mode; | |
2125 | attr.ia_valid = ATTR_MODE; | |
2126 | ||
8b0ad3d4 | 2127 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 2128 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 2129 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
2130 | if (error != 0) |
2131 | goto out_err; | |
1da177e4 LT |
2132 | return 0; |
2133 | out_err: | |
1da177e4 LT |
2134 | d_drop(dentry); |
2135 | return error; | |
2136 | } | |
ddda8e0a | 2137 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
2138 | |
2139 | /* | |
2140 | * See comments for nfs_proc_create regarding failed operations. | |
2141 | */ | |
597d9289 | 2142 | int |
549c7297 CB |
2143 | nfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
2144 | struct dentry *dentry, umode_t mode, dev_t rdev) | |
1da177e4 LT |
2145 | { |
2146 | struct iattr attr; | |
2147 | int status; | |
2148 | ||
1e8968c5 | 2149 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 2150 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 2151 | |
1da177e4 LT |
2152 | attr.ia_mode = mode; |
2153 | attr.ia_valid = ATTR_MODE; | |
2154 | ||
1ca42382 | 2155 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 2156 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 2157 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
2158 | if (status != 0) |
2159 | goto out_err; | |
1da177e4 LT |
2160 | return 0; |
2161 | out_err: | |
1da177e4 LT |
2162 | d_drop(dentry); |
2163 | return status; | |
2164 | } | |
ddda8e0a | 2165 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
2166 | |
2167 | /* | |
2168 | * See comments for nfs_proc_create regarding failed operations. | |
2169 | */ | |
549c7297 CB |
2170 | int nfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
2171 | struct dentry *dentry, umode_t mode) | |
1da177e4 LT |
2172 | { |
2173 | struct iattr attr; | |
2174 | int error; | |
2175 | ||
1e8968c5 | 2176 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 2177 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
2178 | |
2179 | attr.ia_valid = ATTR_MODE; | |
2180 | attr.ia_mode = mode | S_IFDIR; | |
2181 | ||
1ca42382 | 2182 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 2183 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 2184 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
2185 | if (error != 0) |
2186 | goto out_err; | |
1da177e4 LT |
2187 | return 0; |
2188 | out_err: | |
2189 | d_drop(dentry); | |
1da177e4 LT |
2190 | return error; |
2191 | } | |
ddda8e0a | 2192 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 2193 | |
d45b9d8b TM |
2194 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
2195 | { | |
dc3f4198 | 2196 | if (simple_positive(dentry)) |
d45b9d8b TM |
2197 | d_delete(dentry); |
2198 | } | |
2199 | ||
597d9289 | 2200 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
2201 | { |
2202 | int error; | |
2203 | ||
1e8968c5 | 2204 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 2205 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 2206 | |
1ca42382 | 2207 | trace_nfs_rmdir_enter(dir, dentry); |
2b0143b5 | 2208 | if (d_really_is_positive(dentry)) { |
884be175 | 2209 | down_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
2210 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
2211 | /* Ensure the VFS deletes this inode */ | |
2212 | switch (error) { | |
2213 | case 0: | |
2b0143b5 | 2214 | clear_nlink(d_inode(dentry)); |
ba6c0592 TM |
2215 | break; |
2216 | case -ENOENT: | |
2217 | nfs_dentry_handle_enoent(dentry); | |
2218 | } | |
884be175 | 2219 | up_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
2220 | } else |
2221 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 2222 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
2223 | |
2224 | return error; | |
2225 | } | |
ddda8e0a | 2226 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 2227 | |
1da177e4 LT |
2228 | /* |
2229 | * Remove a file after making sure there are no pending writes, | |
2230 | * and after checking that the file has only one user. | |
2231 | * | |
2232 | * We invalidate the attribute cache and free the inode prior to the operation | |
2233 | * to avoid possible races if the server reuses the inode. | |
2234 | */ | |
2235 | static int nfs_safe_remove(struct dentry *dentry) | |
2236 | { | |
2b0143b5 DH |
2237 | struct inode *dir = d_inode(dentry->d_parent); |
2238 | struct inode *inode = d_inode(dentry); | |
1da177e4 LT |
2239 | int error = -EBUSY; |
2240 | ||
6de1472f | 2241 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
2242 | |
2243 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
2244 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
2245 | error = 0; | |
2246 | goto out; | |
2247 | } | |
2248 | ||
1ca42382 | 2249 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 2250 | if (inode != NULL) { |
912678db | 2251 | error = NFS_PROTO(dir)->remove(dir, dentry); |
1da177e4 | 2252 | if (error == 0) |
1b83d707 | 2253 | nfs_drop_nlink(inode); |
1da177e4 | 2254 | } else |
912678db | 2255 | error = NFS_PROTO(dir)->remove(dir, dentry); |
d45b9d8b TM |
2256 | if (error == -ENOENT) |
2257 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 2258 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
2259 | out: |
2260 | return error; | |
2261 | } | |
2262 | ||
2263 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
2264 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
2265 | * | |
2266 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
2267 | */ | |
597d9289 | 2268 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
2269 | { |
2270 | int error; | |
2271 | int need_rehash = 0; | |
2272 | ||
1e8968c5 | 2273 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 2274 | dir->i_ino, dentry); |
1da177e4 | 2275 | |
1ca42382 | 2276 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 2277 | spin_lock(&dentry->d_lock); |
84d08fa8 | 2278 | if (d_count(dentry) > 1) { |
1da177e4 | 2279 | spin_unlock(&dentry->d_lock); |
ccfeb506 | 2280 | /* Start asynchronous writeout of the inode */ |
2b0143b5 | 2281 | write_inode_now(d_inode(dentry), 0); |
1da177e4 | 2282 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 2283 | goto out; |
1da177e4 LT |
2284 | } |
2285 | if (!d_unhashed(dentry)) { | |
2286 | __d_drop(dentry); | |
2287 | need_rehash = 1; | |
2288 | } | |
2289 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 2290 | error = nfs_safe_remove(dentry); |
d45b9d8b | 2291 | if (!error || error == -ENOENT) { |
1da177e4 LT |
2292 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
2293 | } else if (need_rehash) | |
2294 | d_rehash(dentry); | |
1ca42382 TM |
2295 | out: |
2296 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
2297 | return error; |
2298 | } | |
ddda8e0a | 2299 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 2300 | |
873101b3 CL |
2301 | /* |
2302 | * To create a symbolic link, most file systems instantiate a new inode, | |
2303 | * add a page to it containing the path, then write it out to the disk | |
2304 | * using prepare_write/commit_write. | |
2305 | * | |
2306 | * Unfortunately the NFS client can't create the in-core inode first | |
2307 | * because it needs a file handle to create an in-core inode (see | |
2308 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
2309 | * symlink request has completed on the server. | |
2310 | * | |
2311 | * So instead we allocate a raw page, copy the symname into it, then do | |
2312 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
2313 | * now have a new file handle and can instantiate an in-core NFS inode | |
2314 | * and move the raw page into its mapping. | |
2315 | */ | |
549c7297 CB |
2316 | int nfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
2317 | struct dentry *dentry, const char *symname) | |
1da177e4 | 2318 | { |
873101b3 CL |
2319 | struct page *page; |
2320 | char *kaddr; | |
1da177e4 | 2321 | struct iattr attr; |
873101b3 | 2322 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
2323 | int error; |
2324 | ||
1e8968c5 | 2325 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 2326 | dir->i_ino, dentry, symname); |
1da177e4 | 2327 | |
873101b3 CL |
2328 | if (pathlen > PAGE_SIZE) |
2329 | return -ENAMETOOLONG; | |
1da177e4 | 2330 | |
873101b3 CL |
2331 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
2332 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 2333 | |
e8ecde25 | 2334 | page = alloc_page(GFP_USER); |
76566991 | 2335 | if (!page) |
873101b3 | 2336 | return -ENOMEM; |
873101b3 | 2337 | |
e8ecde25 | 2338 | kaddr = page_address(page); |
873101b3 CL |
2339 | memcpy(kaddr, symname, pathlen); |
2340 | if (pathlen < PAGE_SIZE) | |
2341 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
873101b3 | 2342 | |
1ca42382 | 2343 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 2344 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 2345 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 2346 | if (error != 0) { |
1e8968c5 | 2347 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 2348 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 2349 | dentry, symname, error); |
1da177e4 | 2350 | d_drop(dentry); |
873101b3 | 2351 | __free_page(page); |
873101b3 CL |
2352 | return error; |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * No big deal if we can't add this page to the page cache here. | |
2357 | * READLINK will get the missing page from the server if needed. | |
2358 | */ | |
2b0143b5 | 2359 | if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, |
873101b3 | 2360 | GFP_KERNEL)) { |
873101b3 CL |
2361 | SetPageUptodate(page); |
2362 | unlock_page(page); | |
a0b54add RA |
2363 | /* |
2364 | * add_to_page_cache_lru() grabs an extra page refcount. | |
2365 | * Drop it here to avoid leaking this page later. | |
2366 | */ | |
09cbfeaf | 2367 | put_page(page); |
873101b3 CL |
2368 | } else |
2369 | __free_page(page); | |
2370 | ||
873101b3 | 2371 | return 0; |
1da177e4 | 2372 | } |
ddda8e0a | 2373 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 2374 | |
597d9289 | 2375 | int |
1da177e4 LT |
2376 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
2377 | { | |
2b0143b5 | 2378 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
2379 | int error; |
2380 | ||
6de1472f AV |
2381 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
2382 | old_dentry, dentry); | |
1da177e4 | 2383 | |
1fd1085b | 2384 | trace_nfs_link_enter(inode, dir, dentry); |
9697d234 | 2385 | d_drop(dentry); |
1da177e4 | 2386 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 2387 | if (error == 0) { |
7de9c6ee | 2388 | ihold(inode); |
9697d234 | 2389 | d_add(dentry, inode); |
cf809556 | 2390 | } |
1fd1085b | 2391 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
2392 | return error; |
2393 | } | |
ddda8e0a | 2394 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
2395 | |
2396 | /* | |
2397 | * RENAME | |
2398 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
2399 | * different file handle for the same inode after a rename (e.g. when | |
2400 | * moving to a different directory). A fail-safe method to do so would | |
2401 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
2402 | * rename the old file using the sillyrename stuff. This way, the original | |
2403 | * file in old_dir will go away when the last process iput()s the inode. | |
2404 | * | |
2405 | * FIXED. | |
2406 | * | |
2407 | * It actually works quite well. One needs to have the possibility for | |
2408 | * at least one ".nfs..." file in each directory the file ever gets | |
2409 | * moved or linked to which happens automagically with the new | |
2410 | * implementation that only depends on the dcache stuff instead of | |
2411 | * using the inode layer | |
2412 | * | |
2413 | * Unfortunately, things are a little more complicated than indicated | |
2414 | * above. For a cross-directory move, we want to make sure we can get | |
2415 | * rid of the old inode after the operation. This means there must be | |
2416 | * no pending writes (if it's a file), and the use count must be 1. | |
2417 | * If these conditions are met, we can drop the dentries before doing | |
2418 | * the rename. | |
2419 | */ | |
549c7297 CB |
2420 | int nfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
2421 | struct dentry *old_dentry, struct inode *new_dir, | |
2422 | struct dentry *new_dentry, unsigned int flags) | |
1da177e4 | 2423 | { |
2b0143b5 DH |
2424 | struct inode *old_inode = d_inode(old_dentry); |
2425 | struct inode *new_inode = d_inode(new_dentry); | |
d9f29500 | 2426 | struct dentry *dentry = NULL, *rehash = NULL; |
80a491fd | 2427 | struct rpc_task *task; |
1da177e4 LT |
2428 | int error = -EBUSY; |
2429 | ||
1cd66c93 MS |
2430 | if (flags) |
2431 | return -EINVAL; | |
2432 | ||
6de1472f AV |
2433 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
2434 | old_dentry, new_dentry, | |
84d08fa8 | 2435 | d_count(new_dentry)); |
1da177e4 | 2436 | |
70ded201 | 2437 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 2438 | /* |
28f79a1a MS |
2439 | * For non-directories, check whether the target is busy and if so, |
2440 | * make a copy of the dentry and then do a silly-rename. If the | |
2441 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2442 | * the new target. | |
1da177e4 | 2443 | */ |
27226104 MS |
2444 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2445 | /* | |
2446 | * To prevent any new references to the target during the | |
2447 | * rename, we unhash the dentry in advance. | |
2448 | */ | |
d9f29500 | 2449 | if (!d_unhashed(new_dentry)) { |
27226104 | 2450 | d_drop(new_dentry); |
d9f29500 BC |
2451 | rehash = new_dentry; |
2452 | } | |
1da177e4 | 2453 | |
84d08fa8 | 2454 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2455 | int err; |
2456 | ||
2457 | /* copy the target dentry's name */ | |
2458 | dentry = d_alloc(new_dentry->d_parent, | |
2459 | &new_dentry->d_name); | |
2460 | if (!dentry) | |
2461 | goto out; | |
2462 | ||
2463 | /* silly-rename the existing target ... */ | |
2464 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2465 | if (err) |
27226104 | 2466 | goto out; |
24e93025 MS |
2467 | |
2468 | new_dentry = dentry; | |
d9f29500 | 2469 | rehash = NULL; |
24e93025 | 2470 | new_inode = NULL; |
27226104 | 2471 | } |
b1e4adf4 | 2472 | } |
1da177e4 | 2473 | |
d9f29500 | 2474 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
80a491fd JL |
2475 | if (IS_ERR(task)) { |
2476 | error = PTR_ERR(task); | |
2477 | goto out; | |
2478 | } | |
2479 | ||
2480 | error = rpc_wait_for_completion_task(task); | |
818a8dbe BC |
2481 | if (error != 0) { |
2482 | ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; | |
2483 | /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ | |
2484 | smp_wmb(); | |
2485 | } else | |
80a491fd JL |
2486 | error = task->tk_status; |
2487 | rpc_put_task(task); | |
59a707b0 TM |
2488 | /* Ensure the inode attributes are revalidated */ |
2489 | if (error == 0) { | |
2490 | spin_lock(&old_inode->i_lock); | |
2491 | NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
ac46b3d7 TM |
2492 | nfs_set_cache_invalid(old_inode, NFS_INO_INVALID_CHANGE | |
2493 | NFS_INO_INVALID_CTIME | | |
2494 | NFS_INO_REVAL_FORCED); | |
59a707b0 TM |
2495 | spin_unlock(&old_inode->i_lock); |
2496 | } | |
1da177e4 | 2497 | out: |
d9f29500 BC |
2498 | if (rehash) |
2499 | d_rehash(rehash); | |
70ded201 TM |
2500 | trace_nfs_rename_exit(old_dir, old_dentry, |
2501 | new_dir, new_dentry, error); | |
d9f29500 BC |
2502 | if (!error) { |
2503 | if (new_inode != NULL) | |
2504 | nfs_drop_nlink(new_inode); | |
2505 | /* | |
2506 | * The d_move() should be here instead of in an async RPC completion | |
2507 | * handler because we need the proper locks to move the dentry. If | |
2508 | * we're interrupted by a signal, the async RPC completion handler | |
2509 | * should mark the directories for revalidation. | |
2510 | */ | |
2511 | d_move(old_dentry, new_dentry); | |
d803224c | 2512 | nfs_set_verifier(old_dentry, |
d9f29500 BC |
2513 | nfs_save_change_attribute(new_dir)); |
2514 | } else if (error == -ENOENT) | |
2515 | nfs_dentry_handle_enoent(old_dentry); | |
2516 | ||
1da177e4 LT |
2517 | /* new dentry created? */ |
2518 | if (dentry) | |
2519 | dput(dentry); | |
1da177e4 LT |
2520 | return error; |
2521 | } | |
ddda8e0a | 2522 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2523 | |
cfcea3e8 TM |
2524 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2525 | static LIST_HEAD(nfs_access_lru_list); | |
2526 | static atomic_long_t nfs_access_nr_entries; | |
2527 | ||
a8b373ee | 2528 | static unsigned long nfs_access_max_cachesize = 4*1024*1024; |
3a505845 TM |
2529 | module_param(nfs_access_max_cachesize, ulong, 0644); |
2530 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2531 | ||
1c3c07e9 TM |
2532 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2533 | { | |
b68572e0 | 2534 | put_cred(entry->cred); |
f682a398 | 2535 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2536 | smp_mb__before_atomic(); |
cfcea3e8 | 2537 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2538 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2539 | } |
2540 | ||
1a81bb8a TM |
2541 | static void nfs_access_free_list(struct list_head *head) |
2542 | { | |
2543 | struct nfs_access_entry *cache; | |
2544 | ||
2545 | while (!list_empty(head)) { | |
2546 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2547 | list_del(&cache->lru); | |
2548 | nfs_access_free_entry(cache); | |
2549 | } | |
2550 | } | |
2551 | ||
3a505845 TM |
2552 | static unsigned long |
2553 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2554 | { |
2555 | LIST_HEAD(head); | |
aa510da5 | 2556 | struct nfs_inode *nfsi, *next; |
979df72e | 2557 | struct nfs_access_entry *cache; |
1ab6c499 | 2558 | long freed = 0; |
979df72e | 2559 | |
a50f7951 | 2560 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2561 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2562 | struct inode *inode; |
2563 | ||
2564 | if (nr_to_scan-- == 0) | |
2565 | break; | |
9c7e7e23 | 2566 | inode = &nfsi->vfs_inode; |
979df72e TM |
2567 | spin_lock(&inode->i_lock); |
2568 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2569 | goto remove_lru_entry; | |
2570 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2571 | struct nfs_access_entry, lru); | |
2572 | list_move(&cache->lru, &head); | |
2573 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2574 | freed++; |
979df72e TM |
2575 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2576 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2577 | &nfs_access_lru_list); | |
2578 | else { | |
2579 | remove_lru_entry: | |
2580 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2581 | smp_mb__before_atomic(); |
979df72e | 2582 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2583 | smp_mb__after_atomic(); |
979df72e | 2584 | } |
59844a9b | 2585 | spin_unlock(&inode->i_lock); |
979df72e TM |
2586 | } |
2587 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2588 | nfs_access_free_list(&head); |
1ab6c499 DC |
2589 | return freed; |
2590 | } | |
2591 | ||
3a505845 TM |
2592 | unsigned long |
2593 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2594 | { | |
2595 | int nr_to_scan = sc->nr_to_scan; | |
2596 | gfp_t gfp_mask = sc->gfp_mask; | |
2597 | ||
2598 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2599 | return SHRINK_STOP; | |
2600 | return nfs_do_access_cache_scan(nr_to_scan); | |
2601 | } | |
2602 | ||
2603 | ||
1ab6c499 DC |
2604 | unsigned long |
2605 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2606 | { | |
55f841ce | 2607 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2608 | } |
2609 | ||
3a505845 TM |
2610 | static void |
2611 | nfs_access_cache_enforce_limit(void) | |
2612 | { | |
2613 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2614 | unsigned long diff; | |
2615 | unsigned int nr_to_scan; | |
2616 | ||
2617 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2618 | return; | |
2619 | nr_to_scan = 100; | |
2620 | diff = nr_entries - nfs_access_max_cachesize; | |
2621 | if (diff < nr_to_scan) | |
2622 | nr_to_scan = diff; | |
2623 | nfs_do_access_cache_scan(nr_to_scan); | |
2624 | } | |
2625 | ||
1a81bb8a | 2626 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2627 | { |
1c3c07e9 | 2628 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2629 | struct rb_node *n; |
1c3c07e9 TM |
2630 | struct nfs_access_entry *entry; |
2631 | ||
2632 | /* Unhook entries from the cache */ | |
2633 | while ((n = rb_first(root_node)) != NULL) { | |
2634 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2635 | rb_erase(n, root_node); | |
1a81bb8a | 2636 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2637 | } |
2638 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2639 | } |
2640 | ||
1c3c07e9 | 2641 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2642 | { |
1a81bb8a TM |
2643 | LIST_HEAD(head); |
2644 | ||
2645 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2646 | return; | |
cfcea3e8 | 2647 | /* Remove from global LRU init */ |
1a81bb8a TM |
2648 | spin_lock(&nfs_access_lru_lock); |
2649 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2650 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2651 | |
1c3c07e9 | 2652 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2653 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2654 | spin_unlock(&inode->i_lock); | |
2655 | spin_unlock(&nfs_access_lru_lock); | |
2656 | nfs_access_free_list(&head); | |
1c3c07e9 | 2657 | } |
1c606fb7 | 2658 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2659 | |
b68572e0 | 2660 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) |
1c3c07e9 TM |
2661 | { |
2662 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1c3c07e9 TM |
2663 | |
2664 | while (n != NULL) { | |
b68572e0 N |
2665 | struct nfs_access_entry *entry = |
2666 | rb_entry(n, struct nfs_access_entry, rb_node); | |
2667 | int cmp = cred_fscmp(cred, entry->cred); | |
1c3c07e9 | 2668 | |
b68572e0 | 2669 | if (cmp < 0) |
1c3c07e9 | 2670 | n = n->rb_left; |
b68572e0 | 2671 | else if (cmp > 0) |
1c3c07e9 TM |
2672 | n = n->rb_right; |
2673 | else | |
2674 | return entry; | |
1da177e4 | 2675 | } |
1c3c07e9 TM |
2676 | return NULL; |
2677 | } | |
2678 | ||
d2ae4f8b | 2679 | static int nfs_access_get_cached_locked(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block) |
1c3c07e9 TM |
2680 | { |
2681 | struct nfs_inode *nfsi = NFS_I(inode); | |
2682 | struct nfs_access_entry *cache; | |
57b69181 TM |
2683 | bool retry = true; |
2684 | int err; | |
1c3c07e9 | 2685 | |
dc59250c | 2686 | spin_lock(&inode->i_lock); |
57b69181 TM |
2687 | for(;;) { |
2688 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2689 | goto out_zap; | |
2690 | cache = nfs_access_search_rbtree(inode, cred); | |
2691 | err = -ENOENT; | |
2692 | if (cache == NULL) | |
2693 | goto out; | |
2694 | /* Found an entry, is our attribute cache valid? */ | |
21c3ba7e | 2695 | if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
57b69181 | 2696 | break; |
5c965db8 TM |
2697 | if (!retry) |
2698 | break; | |
57b69181 TM |
2699 | err = -ECHILD; |
2700 | if (!may_block) | |
2701 | goto out; | |
57b69181 TM |
2702 | spin_unlock(&inode->i_lock); |
2703 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2704 | if (err) | |
2705 | return err; | |
2706 | spin_lock(&inode->i_lock); | |
2707 | retry = false; | |
2708 | } | |
1c3c07e9 TM |
2709 | res->cred = cache->cred; |
2710 | res->mask = cache->mask; | |
cfcea3e8 | 2711 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2712 | err = 0; |
2713 | out: | |
2714 | spin_unlock(&inode->i_lock); | |
2715 | return err; | |
1c3c07e9 | 2716 | out_zap: |
1a81bb8a TM |
2717 | spin_unlock(&inode->i_lock); |
2718 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2719 | return -ENOENT; |
2720 | } | |
2721 | ||
b68572e0 | 2722 | static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) |
f682a398 N |
2723 | { |
2724 | /* Only check the most recently returned cache entry, | |
2725 | * but do it without locking. | |
2726 | */ | |
2727 | struct nfs_inode *nfsi = NFS_I(inode); | |
2728 | struct nfs_access_entry *cache; | |
2729 | int err = -ECHILD; | |
2730 | struct list_head *lh; | |
2731 | ||
2732 | rcu_read_lock(); | |
2733 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2734 | goto out; | |
9f01eb5d | 2735 | lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru)); |
f682a398 N |
2736 | cache = list_entry(lh, struct nfs_access_entry, lru); |
2737 | if (lh == &nfsi->access_cache_entry_lru || | |
9a206de2 | 2738 | cred_fscmp(cred, cache->cred) != 0) |
f682a398 N |
2739 | cache = NULL; |
2740 | if (cache == NULL) | |
2741 | goto out; | |
21c3ba7e | 2742 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
f682a398 | 2743 | goto out; |
f682a398 N |
2744 | res->cred = cache->cred; |
2745 | res->mask = cache->mask; | |
21c3ba7e | 2746 | err = 0; |
f682a398 N |
2747 | out: |
2748 | rcu_read_unlock(); | |
2749 | return err; | |
2750 | } | |
2751 | ||
d2ae4f8b FL |
2752 | int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct |
2753 | nfs_access_entry *res, bool may_block) | |
2754 | { | |
2755 | int status; | |
2756 | ||
2757 | status = nfs_access_get_cached_rcu(inode, cred, res); | |
2758 | if (status != 0) | |
2759 | status = nfs_access_get_cached_locked(inode, cred, res, | |
2760 | may_block); | |
2761 | ||
2762 | return status; | |
2763 | } | |
2764 | EXPORT_SYMBOL_GPL(nfs_access_get_cached); | |
2765 | ||
1c3c07e9 TM |
2766 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2767 | { | |
cfcea3e8 TM |
2768 | struct nfs_inode *nfsi = NFS_I(inode); |
2769 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2770 | struct rb_node **p = &root_node->rb_node; |
2771 | struct rb_node *parent = NULL; | |
2772 | struct nfs_access_entry *entry; | |
b68572e0 | 2773 | int cmp; |
1c3c07e9 TM |
2774 | |
2775 | spin_lock(&inode->i_lock); | |
2776 | while (*p != NULL) { | |
2777 | parent = *p; | |
2778 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
b68572e0 | 2779 | cmp = cred_fscmp(set->cred, entry->cred); |
1c3c07e9 | 2780 | |
b68572e0 | 2781 | if (cmp < 0) |
1c3c07e9 | 2782 | p = &parent->rb_left; |
b68572e0 | 2783 | else if (cmp > 0) |
1c3c07e9 TM |
2784 | p = &parent->rb_right; |
2785 | else | |
2786 | goto found; | |
2787 | } | |
2788 | rb_link_node(&set->rb_node, parent, p); | |
2789 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2790 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2791 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2792 | return; |
2793 | found: | |
2794 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2795 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2796 | list_del(&entry->lru); | |
1c3c07e9 TM |
2797 | spin_unlock(&inode->i_lock); |
2798 | nfs_access_free_entry(entry); | |
2799 | } | |
2800 | ||
6168f62c | 2801 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2802 | { |
2803 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2804 | if (cache == NULL) | |
2805 | return; | |
2806 | RB_CLEAR_NODE(&cache->rb_node); | |
b68572e0 | 2807 | cache->cred = get_cred(set->cred); |
1da177e4 | 2808 | cache->mask = set->mask; |
1c3c07e9 | 2809 | |
f682a398 N |
2810 | /* The above field assignments must be visible |
2811 | * before this item appears on the lru. We cannot easily | |
2812 | * use rcu_assign_pointer, so just force the memory barrier. | |
2813 | */ | |
2814 | smp_wmb(); | |
1c3c07e9 | 2815 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2816 | |
2817 | /* Update accounting */ | |
4e857c58 | 2818 | smp_mb__before_atomic(); |
cfcea3e8 | 2819 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2820 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2821 | |
2822 | /* Add inode to global LRU list */ | |
1a81bb8a | 2823 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2824 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2825 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2826 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2827 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2828 | spin_unlock(&nfs_access_lru_lock); |
2829 | } | |
3a505845 | 2830 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2831 | } |
6168f62c WAA |
2832 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2833 | ||
3c181827 AS |
2834 | #define NFS_MAY_READ (NFS_ACCESS_READ) |
2835 | #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2836 | NFS_ACCESS_EXTEND | \ | |
2837 | NFS_ACCESS_DELETE) | |
2838 | #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2839 | NFS_ACCESS_EXTEND) | |
ecbb903c | 2840 | #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE |
3c181827 AS |
2841 | #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) |
2842 | #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) | |
15d4b73a | 2843 | static int |
ecbb903c | 2844 | nfs_access_calc_mask(u32 access_result, umode_t umode) |
15d4b73a TM |
2845 | { |
2846 | int mask = 0; | |
2847 | ||
2848 | if (access_result & NFS_MAY_READ) | |
2849 | mask |= MAY_READ; | |
ecbb903c TM |
2850 | if (S_ISDIR(umode)) { |
2851 | if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) | |
2852 | mask |= MAY_WRITE; | |
2853 | if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) | |
2854 | mask |= MAY_EXEC; | |
2855 | } else if (S_ISREG(umode)) { | |
2856 | if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) | |
2857 | mask |= MAY_WRITE; | |
2858 | if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) | |
2859 | mask |= MAY_EXEC; | |
2860 | } else if (access_result & NFS_MAY_WRITE) | |
2861 | mask |= MAY_WRITE; | |
15d4b73a TM |
2862 | return mask; |
2863 | } | |
2864 | ||
6168f62c WAA |
2865 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) |
2866 | { | |
bd8b2441 | 2867 | entry->mask = access_result; |
6168f62c WAA |
2868 | } |
2869 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 | 2870 | |
b68572e0 | 2871 | static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) |
1da177e4 LT |
2872 | { |
2873 | struct nfs_access_entry cache; | |
57b69181 | 2874 | bool may_block = (mask & MAY_NOT_BLOCK) == 0; |
e8194b7d | 2875 | int cache_mask = -1; |
1da177e4 LT |
2876 | int status; |
2877 | ||
f4ce1299 TM |
2878 | trace_nfs_access_enter(inode); |
2879 | ||
d2ae4f8b | 2880 | status = nfs_access_get_cached(inode, cred, &cache, may_block); |
1da177e4 | 2881 | if (status == 0) |
f4ce1299 | 2882 | goto out_cached; |
1da177e4 | 2883 | |
f3324a2a | 2884 | status = -ECHILD; |
57b69181 | 2885 | if (!may_block) |
f3324a2a N |
2886 | goto out; |
2887 | ||
1750d929 AS |
2888 | /* |
2889 | * Determine which access bits we want to ask for... | |
2890 | */ | |
2891 | cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; | |
72832a24 FL |
2892 | if (nfs_server_capable(inode, NFS_CAP_XATTR)) { |
2893 | cache.mask |= NFS_ACCESS_XAREAD | NFS_ACCESS_XAWRITE | | |
2894 | NFS_ACCESS_XALIST; | |
2895 | } | |
1750d929 AS |
2896 | if (S_ISDIR(inode->i_mode)) |
2897 | cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; | |
2898 | else | |
2899 | cache.mask |= NFS_ACCESS_EXECUTE; | |
1da177e4 | 2900 | cache.cred = cred; |
1da177e4 | 2901 | status = NFS_PROTO(inode)->access(inode, &cache); |
a71ee337 SJ |
2902 | if (status != 0) { |
2903 | if (status == -ESTALE) { | |
a71ee337 | 2904 | if (!S_ISDIR(inode->i_mode)) |
93ce4af7 TM |
2905 | nfs_set_inode_stale(inode); |
2906 | else | |
2907 | nfs_zap_caches(inode); | |
a71ee337 | 2908 | } |
f4ce1299 | 2909 | goto out; |
a71ee337 | 2910 | } |
1da177e4 | 2911 | nfs_access_add_cache(inode, &cache); |
f4ce1299 | 2912 | out_cached: |
ecbb903c | 2913 | cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); |
bd8b2441 | 2914 | if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) |
f4ce1299 | 2915 | status = -EACCES; |
1da177e4 | 2916 | out: |
e8194b7d | 2917 | trace_nfs_access_exit(inode, mask, cache_mask, status); |
f4ce1299 | 2918 | return status; |
1da177e4 LT |
2919 | } |
2920 | ||
af22f94a TM |
2921 | static int nfs_open_permission_mask(int openflags) |
2922 | { | |
2923 | int mask = 0; | |
2924 | ||
f8d9a897 WAA |
2925 | if (openflags & __FMODE_EXEC) { |
2926 | /* ONLY check exec rights */ | |
2927 | mask = MAY_EXEC; | |
2928 | } else { | |
2929 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2930 | mask |= MAY_READ; | |
2931 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2932 | mask |= MAY_WRITE; | |
2933 | } | |
2934 | ||
af22f94a TM |
2935 | return mask; |
2936 | } | |
2937 | ||
b68572e0 | 2938 | int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) |
af22f94a TM |
2939 | { |
2940 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2941 | } | |
89d77c8f | 2942 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2943 | |
5c5fc09a TM |
2944 | static int nfs_execute_ok(struct inode *inode, int mask) |
2945 | { | |
2946 | struct nfs_server *server = NFS_SERVER(inode); | |
21c3ba7e | 2947 | int ret = 0; |
5c5fc09a | 2948 | |
3825827e TM |
2949 | if (S_ISDIR(inode->i_mode)) |
2950 | return 0; | |
720869eb | 2951 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_MODE)) { |
21c3ba7e TM |
2952 | if (mask & MAY_NOT_BLOCK) |
2953 | return -ECHILD; | |
2954 | ret = __nfs_revalidate_inode(server, inode); | |
2955 | } | |
5c5fc09a TM |
2956 | if (ret == 0 && !execute_ok(inode)) |
2957 | ret = -EACCES; | |
2958 | return ret; | |
2959 | } | |
2960 | ||
549c7297 CB |
2961 | int nfs_permission(struct user_namespace *mnt_userns, |
2962 | struct inode *inode, | |
2963 | int mask) | |
1da177e4 | 2964 | { |
b68572e0 | 2965 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2966 | int res = 0; |
2967 | ||
91d5b470 CL |
2968 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2969 | ||
e6305c43 | 2970 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2971 | goto out; |
2972 | /* Is this sys_access() ? */ | |
9cfcac81 | 2973 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2974 | goto force_lookup; |
2975 | ||
2976 | switch (inode->i_mode & S_IFMT) { | |
2977 | case S_IFLNK: | |
2978 | goto out; | |
2979 | case S_IFREG: | |
762674f8 TM |
2980 | if ((mask & MAY_OPEN) && |
2981 | nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) | |
2982 | return 0; | |
1da177e4 LT |
2983 | break; |
2984 | case S_IFDIR: | |
2985 | /* | |
2986 | * Optimize away all write operations, since the server | |
2987 | * will check permissions when we perform the op. | |
2988 | */ | |
2989 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2990 | goto out; | |
2991 | } | |
2992 | ||
2993 | force_lookup: | |
1da177e4 LT |
2994 | if (!NFS_PROTO(inode)->access) |
2995 | goto out_notsup; | |
2996 | ||
eb095c14 | 2997 | res = nfs_do_access(inode, cred, mask); |
1da177e4 | 2998 | out: |
5c5fc09a TM |
2999 | if (!res && (mask & MAY_EXEC)) |
3000 | res = nfs_execute_ok(inode, mask); | |
f696a365 | 3001 | |
1e8968c5 | 3002 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 3003 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
3004 | return res; |
3005 | out_notsup: | |
d51ac1a8 N |
3006 | if (mask & MAY_NOT_BLOCK) |
3007 | return -ECHILD; | |
3008 | ||
720869eb TM |
3009 | res = nfs_revalidate_inode(inode, NFS_INO_INVALID_MODE | |
3010 | NFS_INO_INVALID_OTHER); | |
1da177e4 | 3011 | if (res == 0) |
47291baa | 3012 | res = generic_permission(&init_user_ns, inode, mask); |
1e7cb3dc | 3013 | goto out; |
1da177e4 | 3014 | } |
ddda8e0a | 3015 | EXPORT_SYMBOL_GPL(nfs_permission); |