Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
ddda8e0a | 20 | #include <linux/module.h> |
1da177e4 LT |
21 | #include <linux/time.h> |
22 | #include <linux/errno.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/sunrpc/clnt.h> | |
30 | #include <linux/nfs_fs.h> | |
31 | #include <linux/nfs_mount.h> | |
32 | #include <linux/pagemap.h> | |
873101b3 | 33 | #include <linux/pagevec.h> |
1da177e4 | 34 | #include <linux/namei.h> |
54ceac45 | 35 | #include <linux/mount.h> |
a0b8cab3 | 36 | #include <linux/swap.h> |
e8edc6e0 | 37 | #include <linux/sched.h> |
04e4bd1c | 38 | #include <linux/kmemleak.h> |
64c2ce8b | 39 | #include <linux/xattr.h> |
1da177e4 LT |
40 | |
41 | #include "delegation.h" | |
91d5b470 | 42 | #include "iostat.h" |
4c30d56e | 43 | #include "internal.h" |
cd9a1c0e | 44 | #include "fscache.h" |
1da177e4 | 45 | |
f4ce1299 TM |
46 | #include "nfstrace.h" |
47 | ||
1da177e4 LT |
48 | /* #define NFS_DEBUG_VERBOSE 1 */ |
49 | ||
50 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 51 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 52 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 53 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 54 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 55 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 56 | |
4b6f5d20 | 57 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 58 | .llseek = nfs_llseek_dir, |
1da177e4 | 59 | .read = generic_read_dir, |
23db8620 | 60 | .iterate = nfs_readdir, |
1da177e4 | 61 | .open = nfs_opendir, |
480c2006 | 62 | .release = nfs_closedir, |
1da177e4 LT |
63 | .fsync = nfs_fsync_dir, |
64 | }; | |
65 | ||
11de3b11 TM |
66 | const struct address_space_operations nfs_dir_aops = { |
67 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
68 | }; |
69 | ||
0c030806 | 70 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
71 | { |
72 | struct nfs_open_dir_context *ctx; | |
73 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
74 | if (ctx != NULL) { | |
8ef2ce3e | 75 | ctx->duped = 0; |
0c030806 | 76 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 77 | ctx->dir_cookie = 0; |
8ef2ce3e | 78 | ctx->dup_cookie = 0; |
480c2006 | 79 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
80 | return ctx; |
81 | } | |
82 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
83 | } |
84 | ||
85 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
86 | { | |
87 | put_rpccred(ctx->cred); | |
88 | kfree(ctx); | |
89 | } | |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Open file | |
93 | */ | |
94 | static int | |
95 | nfs_opendir(struct inode *inode, struct file *filp) | |
96 | { | |
480c2006 BS |
97 | int res = 0; |
98 | struct nfs_open_dir_context *ctx; | |
99 | struct rpc_cred *cred; | |
1da177e4 | 100 | |
6da24bc9 | 101 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
102 | filp->f_path.dentry->d_parent->d_name.name, |
103 | filp->f_path.dentry->d_name.name); | |
104 | ||
105 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 106 | |
480c2006 BS |
107 | cred = rpc_lookup_cred(); |
108 | if (IS_ERR(cred)) | |
109 | return PTR_ERR(cred); | |
0c030806 | 110 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
111 | if (IS_ERR(ctx)) { |
112 | res = PTR_ERR(ctx); | |
113 | goto out; | |
114 | } | |
115 | filp->private_data = ctx; | |
f5a73672 NB |
116 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
117 | /* This is a mountpoint, so d_revalidate will never | |
118 | * have been called, so we need to refresh the | |
119 | * inode (for close-open consistency) ourselves. | |
120 | */ | |
121 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
122 | } | |
480c2006 BS |
123 | out: |
124 | put_rpccred(cred); | |
1da177e4 LT |
125 | return res; |
126 | } | |
127 | ||
480c2006 BS |
128 | static int |
129 | nfs_closedir(struct inode *inode, struct file *filp) | |
130 | { | |
131 | put_nfs_open_dir_context(filp->private_data); | |
132 | return 0; | |
133 | } | |
134 | ||
d1bacf9e BS |
135 | struct nfs_cache_array_entry { |
136 | u64 cookie; | |
137 | u64 ino; | |
138 | struct qstr string; | |
0b26a0bf | 139 | unsigned char d_type; |
d1bacf9e BS |
140 | }; |
141 | ||
142 | struct nfs_cache_array { | |
88b8e133 | 143 | int size; |
d1bacf9e BS |
144 | int eof_index; |
145 | u64 last_cookie; | |
146 | struct nfs_cache_array_entry array[0]; | |
147 | }; | |
148 | ||
573c4e1e | 149 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
150 | typedef struct { |
151 | struct file *file; | |
152 | struct page *page; | |
23db8620 | 153 | struct dir_context *ctx; |
1da177e4 | 154 | unsigned long page_index; |
f0dd2136 | 155 | u64 *dir_cookie; |
0aded708 | 156 | u64 last_cookie; |
f0dd2136 | 157 | loff_t current_index; |
1da177e4 | 158 | decode_dirent_t decode; |
d1bacf9e | 159 | |
1f4eab7e | 160 | unsigned long timestamp; |
4704f0e2 | 161 | unsigned long gencount; |
d1bacf9e BS |
162 | unsigned int cache_entry_index; |
163 | unsigned int plus:1; | |
164 | unsigned int eof:1; | |
1da177e4 LT |
165 | } nfs_readdir_descriptor_t; |
166 | ||
d1bacf9e BS |
167 | /* |
168 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
169 | */ |
170 | static | |
d1bacf9e BS |
171 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
172 | { | |
8cd51a0c | 173 | void *ptr; |
d1bacf9e BS |
174 | if (page == NULL) |
175 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
176 | ptr = kmap(page); |
177 | if (ptr == NULL) | |
178 | return ERR_PTR(-ENOMEM); | |
179 | return ptr; | |
d1bacf9e BS |
180 | } |
181 | ||
182 | static | |
183 | void nfs_readdir_release_array(struct page *page) | |
184 | { | |
185 | kunmap(page); | |
186 | } | |
187 | ||
188 | /* | |
189 | * we are freeing strings created by nfs_add_to_readdir_array() | |
190 | */ | |
191 | static | |
11de3b11 | 192 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 193 | { |
11de3b11 | 194 | struct nfs_cache_array *array; |
d1bacf9e | 195 | int i; |
8cd51a0c | 196 | |
2b86ce2d | 197 | array = kmap_atomic(page); |
d1bacf9e BS |
198 | for (i = 0; i < array->size; i++) |
199 | kfree(array->array[i].string.name); | |
2b86ce2d | 200 | kunmap_atomic(array); |
d1bacf9e BS |
201 | } |
202 | ||
203 | /* | |
204 | * the caller is responsible for freeing qstr.name | |
205 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
206 | * nfs_clear_readdir_array() | |
207 | */ | |
208 | static | |
4a201d6e | 209 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
210 | { |
211 | string->len = len; | |
212 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
213 | if (string->name == NULL) |
214 | return -ENOMEM; | |
04e4bd1c CM |
215 | /* |
216 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
217 | * in a page cache page which kmemleak does not scan. | |
218 | */ | |
219 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
220 | string->hash = full_name_hash(name, len); |
221 | return 0; | |
d1bacf9e BS |
222 | } |
223 | ||
224 | static | |
225 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
226 | { | |
227 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
228 | struct nfs_cache_array_entry *cache_entry; |
229 | int ret; | |
230 | ||
d1bacf9e BS |
231 | if (IS_ERR(array)) |
232 | return PTR_ERR(array); | |
3020093f TM |
233 | |
234 | cache_entry = &array->array[array->size]; | |
235 | ||
236 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 237 | ret = -ENOSPC; |
3020093f | 238 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 239 | goto out; |
d1bacf9e | 240 | |
4a201d6e TM |
241 | cache_entry->cookie = entry->prev_cookie; |
242 | cache_entry->ino = entry->ino; | |
0b26a0bf | 243 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
244 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
245 | if (ret) | |
246 | goto out; | |
d1bacf9e | 247 | array->last_cookie = entry->cookie; |
8cd51a0c | 248 | array->size++; |
47c716cb | 249 | if (entry->eof != 0) |
d1bacf9e | 250 | array->eof_index = array->size; |
4a201d6e | 251 | out: |
d1bacf9e | 252 | nfs_readdir_release_array(page); |
4a201d6e | 253 | return ret; |
d1bacf9e BS |
254 | } |
255 | ||
256 | static | |
257 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
258 | { | |
23db8620 | 259 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
260 | unsigned int index; |
261 | ||
262 | if (diff < 0) | |
263 | goto out_eof; | |
264 | if (diff >= array->size) { | |
8cd51a0c | 265 | if (array->eof_index >= 0) |
d1bacf9e | 266 | goto out_eof; |
d1bacf9e BS |
267 | return -EAGAIN; |
268 | } | |
269 | ||
270 | index = (unsigned int)diff; | |
271 | *desc->dir_cookie = array->array[index].cookie; | |
272 | desc->cache_entry_index = index; | |
d1bacf9e BS |
273 | return 0; |
274 | out_eof: | |
275 | desc->eof = 1; | |
276 | return -EBADCOOKIE; | |
277 | } | |
278 | ||
279 | static | |
280 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
281 | { | |
282 | int i; | |
8ef2ce3e | 283 | loff_t new_pos; |
d1bacf9e BS |
284 | int status = -EAGAIN; |
285 | ||
286 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 287 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 288 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
289 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
290 | ||
8ef2ce3e | 291 | new_pos = desc->current_index + i; |
0c030806 TM |
292 | if (ctx->attr_gencount != nfsi->attr_gencount |
293 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
294 | ctx->duped = 0; | |
295 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 296 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
297 | if (ctx->duped > 0 |
298 | && ctx->dup_cookie == *desc->dir_cookie) { | |
299 | if (printk_ratelimit()) { | |
300 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
301 | "Please contact your server vendor. " | |
374e4e3e | 302 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
303 | desc->file->f_dentry->d_parent->d_name.name, |
304 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 305 | array->array[i].string.name, |
0c030806 TM |
306 | *desc->dir_cookie); |
307 | } | |
308 | status = -ELOOP; | |
309 | goto out; | |
310 | } | |
8ef2ce3e | 311 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 312 | ctx->duped = -1; |
8ef2ce3e | 313 | } |
23db8620 | 314 | desc->ctx->pos = new_pos; |
d1bacf9e | 315 | desc->cache_entry_index = i; |
47c716cb | 316 | return 0; |
d1bacf9e BS |
317 | } |
318 | } | |
47c716cb | 319 | if (array->eof_index >= 0) { |
8cd51a0c | 320 | status = -EBADCOOKIE; |
18fb5fe4 TM |
321 | if (*desc->dir_cookie == array->last_cookie) |
322 | desc->eof = 1; | |
8cd51a0c | 323 | } |
0c030806 | 324 | out: |
d1bacf9e BS |
325 | return status; |
326 | } | |
327 | ||
328 | static | |
329 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
330 | { | |
331 | struct nfs_cache_array *array; | |
47c716cb | 332 | int status; |
d1bacf9e BS |
333 | |
334 | array = nfs_readdir_get_array(desc->page); | |
335 | if (IS_ERR(array)) { | |
336 | status = PTR_ERR(array); | |
337 | goto out; | |
338 | } | |
339 | ||
340 | if (*desc->dir_cookie == 0) | |
341 | status = nfs_readdir_search_for_pos(array, desc); | |
342 | else | |
343 | status = nfs_readdir_search_for_cookie(array, desc); | |
344 | ||
47c716cb | 345 | if (status == -EAGAIN) { |
0aded708 | 346 | desc->last_cookie = array->last_cookie; |
e47c085a | 347 | desc->current_index += array->size; |
47c716cb TM |
348 | desc->page_index++; |
349 | } | |
d1bacf9e BS |
350 | nfs_readdir_release_array(desc->page); |
351 | out: | |
352 | return status; | |
353 | } | |
354 | ||
355 | /* Fill a page with xdr information before transferring to the cache page */ | |
356 | static | |
56e4ebf8 | 357 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 358 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 359 | { |
480c2006 BS |
360 | struct nfs_open_dir_context *ctx = file->private_data; |
361 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 362 | unsigned long timestamp, gencount; |
1da177e4 LT |
363 | int error; |
364 | ||
1da177e4 LT |
365 | again: |
366 | timestamp = jiffies; | |
4704f0e2 | 367 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 368 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
369 | NFS_SERVER(inode)->dtsize, desc->plus); |
370 | if (error < 0) { | |
371 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
372 | if (error == -ENOTSUPP && desc->plus) { | |
373 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 374 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
375 | desc->plus = 0; |
376 | goto again; | |
377 | } | |
378 | goto error; | |
379 | } | |
1f4eab7e | 380 | desc->timestamp = timestamp; |
4704f0e2 | 381 | desc->gencount = gencount; |
d1bacf9e BS |
382 | error: |
383 | return error; | |
1da177e4 LT |
384 | } |
385 | ||
573c4e1e CL |
386 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
387 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 388 | { |
573c4e1e | 389 | int error; |
1da177e4 | 390 | |
573c4e1e CL |
391 | error = desc->decode(xdr, entry, desc->plus); |
392 | if (error) | |
393 | return error; | |
d1bacf9e BS |
394 | entry->fattr->time_start = desc->timestamp; |
395 | entry->fattr->gencount = desc->gencount; | |
396 | return 0; | |
1da177e4 LT |
397 | } |
398 | ||
d39ab9de BS |
399 | static |
400 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
401 | { | |
d39ab9de BS |
402 | if (dentry->d_inode == NULL) |
403 | goto different; | |
37a09f07 | 404 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
405 | goto different; |
406 | return 1; | |
407 | different: | |
408 | return 0; | |
409 | } | |
410 | ||
d69ee9b8 | 411 | static |
23db8620 | 412 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
413 | { |
414 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
415 | return false; | |
416 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
417 | return true; | |
23db8620 | 418 | if (ctx->pos == 0) |
d69ee9b8 TM |
419 | return true; |
420 | return false; | |
421 | } | |
422 | ||
423 | /* | |
424 | * This function is called by the lookup code to request the use of | |
425 | * readdirplus to accelerate any future lookups in the same | |
426 | * directory. | |
427 | */ | |
428 | static | |
429 | void nfs_advise_use_readdirplus(struct inode *dir) | |
430 | { | |
431 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
432 | } | |
433 | ||
d39ab9de BS |
434 | static |
435 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
436 | { | |
26fe5750 | 437 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
438 | struct dentry *dentry; |
439 | struct dentry *alias; | |
d39ab9de BS |
440 | struct inode *dir = parent->d_inode; |
441 | struct inode *inode; | |
aa9c2669 | 442 | int status; |
d39ab9de | 443 | |
4a201d6e TM |
444 | if (filename.name[0] == '.') { |
445 | if (filename.len == 1) | |
446 | return; | |
447 | if (filename.len == 2 && filename.name[1] == '.') | |
448 | return; | |
449 | } | |
450 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 451 | |
4a201d6e | 452 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
453 | if (dentry != NULL) { |
454 | if (nfs_same_file(dentry, entry)) { | |
cda57a1e | 455 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
aa9c2669 DQ |
456 | status = nfs_refresh_inode(dentry->d_inode, entry->fattr); |
457 | if (!status) | |
458 | nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label); | |
d39ab9de BS |
459 | goto out; |
460 | } else { | |
696199f8 AV |
461 | if (d_invalidate(dentry) != 0) |
462 | goto out; | |
d39ab9de BS |
463 | dput(dentry); |
464 | } | |
465 | } | |
466 | ||
467 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
468 | if (dentry == NULL) |
469 | return; | |
470 | ||
1775fd3e | 471 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
d39ab9de BS |
472 | if (IS_ERR(inode)) |
473 | goto out; | |
474 | ||
475 | alias = d_materialise_unique(dentry, inode); | |
476 | if (IS_ERR(alias)) | |
477 | goto out; | |
478 | else if (alias) { | |
479 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
480 | dput(alias); | |
481 | } else | |
482 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
483 | ||
484 | out: | |
485 | dput(dentry); | |
d39ab9de BS |
486 | } |
487 | ||
d1bacf9e BS |
488 | /* Perform conversion from xdr to cache array */ |
489 | static | |
8cd51a0c | 490 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 491 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 492 | { |
babddc72 | 493 | struct xdr_stream stream; |
f7da7a12 | 494 | struct xdr_buf buf; |
6650239a | 495 | struct page *scratch; |
99424380 | 496 | struct nfs_cache_array *array; |
5c346854 TM |
497 | unsigned int count = 0; |
498 | int status; | |
babddc72 | 499 | |
6650239a TM |
500 | scratch = alloc_page(GFP_KERNEL); |
501 | if (scratch == NULL) | |
502 | return -ENOMEM; | |
babddc72 | 503 | |
f7da7a12 | 504 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 505 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
506 | |
507 | do { | |
508 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
509 | if (status != 0) { |
510 | if (status == -EAGAIN) | |
511 | status = 0; | |
99424380 | 512 | break; |
8cd51a0c | 513 | } |
99424380 | 514 | |
5c346854 TM |
515 | count++; |
516 | ||
47c716cb | 517 | if (desc->plus != 0) |
d39ab9de | 518 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
519 | |
520 | status = nfs_readdir_add_to_array(entry, page); | |
521 | if (status != 0) | |
522 | break; | |
99424380 BS |
523 | } while (!entry->eof); |
524 | ||
47c716cb | 525 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 526 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
527 | if (!IS_ERR(array)) { |
528 | array->eof_index = array->size; | |
529 | status = 0; | |
530 | nfs_readdir_release_array(page); | |
5c346854 TM |
531 | } else |
532 | status = PTR_ERR(array); | |
1da177e4 | 533 | } |
6650239a TM |
534 | |
535 | put_page(scratch); | |
8cd51a0c | 536 | return status; |
56e4ebf8 BS |
537 | } |
538 | ||
539 | static | |
540 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
541 | { | |
542 | unsigned int i; | |
543 | for (i = 0; i < npages; i++) | |
544 | put_page(pages[i]); | |
545 | } | |
546 | ||
547 | static | |
548 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
549 | unsigned int npages) | |
550 | { | |
56e4ebf8 BS |
551 | nfs_readdir_free_pagearray(pages, npages); |
552 | } | |
553 | ||
554 | /* | |
555 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
556 | * to nfs_readdir_free_large_page | |
557 | */ | |
558 | static | |
6650239a | 559 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 560 | { |
56e4ebf8 BS |
561 | unsigned int i; |
562 | ||
563 | for (i = 0; i < npages; i++) { | |
564 | struct page *page = alloc_page(GFP_KERNEL); | |
565 | if (page == NULL) | |
566 | goto out_freepages; | |
567 | pages[i] = page; | |
568 | } | |
6650239a | 569 | return 0; |
56e4ebf8 | 570 | |
56e4ebf8 BS |
571 | out_freepages: |
572 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 573 | return -ENOMEM; |
1da177e4 LT |
574 | } |
575 | ||
d1bacf9e BS |
576 | static |
577 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 578 | { |
56e4ebf8 BS |
579 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
580 | void *pages_ptr = NULL; | |
d1bacf9e BS |
581 | struct nfs_entry entry; |
582 | struct file *file = desc->file; | |
583 | struct nfs_cache_array *array; | |
8cd51a0c | 584 | int status = -ENOMEM; |
56e4ebf8 | 585 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
586 | |
587 | entry.prev_cookie = 0; | |
0aded708 | 588 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
589 | entry.eof = 0; |
590 | entry.fh = nfs_alloc_fhandle(); | |
591 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 592 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
593 | if (entry.fh == NULL || entry.fattr == NULL) |
594 | goto out; | |
00a92642 | 595 | |
14c43f76 DQ |
596 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
597 | if (IS_ERR(entry.label)) { | |
598 | status = PTR_ERR(entry.label); | |
599 | goto out; | |
600 | } | |
601 | ||
d1bacf9e | 602 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
603 | if (IS_ERR(array)) { |
604 | status = PTR_ERR(array); | |
14c43f76 | 605 | goto out_label_free; |
8cd51a0c | 606 | } |
d1bacf9e BS |
607 | memset(array, 0, sizeof(struct nfs_cache_array)); |
608 | array->eof_index = -1; | |
00a92642 | 609 | |
6650239a TM |
610 | status = nfs_readdir_large_page(pages, array_size); |
611 | if (status < 0) | |
d1bacf9e BS |
612 | goto out_release_array; |
613 | do { | |
ac396128 | 614 | unsigned int pglen; |
56e4ebf8 | 615 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 616 | |
d1bacf9e | 617 | if (status < 0) |
00a92642 | 618 | break; |
ac396128 | 619 | pglen = status; |
6650239a | 620 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
621 | if (status < 0) { |
622 | if (status == -ENOSPC) | |
623 | status = 0; | |
624 | break; | |
625 | } | |
626 | } while (array->eof_index < 0); | |
d1bacf9e | 627 | |
56e4ebf8 | 628 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
629 | out_release_array: |
630 | nfs_readdir_release_array(page); | |
14c43f76 DQ |
631 | out_label_free: |
632 | nfs4_label_free(entry.label); | |
d1bacf9e BS |
633 | out: |
634 | nfs_free_fattr(entry.fattr); | |
635 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
636 | return status; |
637 | } | |
638 | ||
639 | /* | |
d1bacf9e BS |
640 | * Now we cache directories properly, by converting xdr information |
641 | * to an array that can be used for lookups later. This results in | |
642 | * fewer cache pages, since we can store more information on each page. | |
643 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 644 | */ |
d1bacf9e BS |
645 | static |
646 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 647 | { |
496ad9aa | 648 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 649 | int ret; |
1da177e4 | 650 | |
8cd51a0c TM |
651 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
652 | if (ret < 0) | |
d1bacf9e BS |
653 | goto error; |
654 | SetPageUptodate(page); | |
1da177e4 | 655 | |
d1bacf9e BS |
656 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
657 | /* Should never happen */ | |
658 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 659 | } |
d1bacf9e BS |
660 | unlock_page(page); |
661 | return 0; | |
662 | error: | |
663 | unlock_page(page); | |
8cd51a0c | 664 | return ret; |
d1bacf9e | 665 | } |
1da177e4 | 666 | |
d1bacf9e BS |
667 | static |
668 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
669 | { | |
11de3b11 TM |
670 | if (!desc->page->mapping) |
671 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
672 | page_cache_release(desc->page); |
673 | desc->page = NULL; | |
674 | } | |
675 | ||
676 | static | |
677 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
678 | { | |
496ad9aa | 679 | return read_cache_page(file_inode(desc->file)->i_mapping, |
d1bacf9e | 680 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
681 | } |
682 | ||
683 | /* | |
d1bacf9e | 684 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 685 | */ |
d1bacf9e BS |
686 | static |
687 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
688 | { | |
689 | int res; | |
690 | ||
691 | desc->page = get_cache_page(desc); | |
692 | if (IS_ERR(desc->page)) | |
693 | return PTR_ERR(desc->page); | |
694 | ||
695 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
696 | if (res != 0) |
697 | cache_page_release(desc); | |
d1bacf9e BS |
698 | return res; |
699 | } | |
700 | ||
701 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
702 | static inline |
703 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
704 | { | |
8cd51a0c | 705 | int res; |
d1bacf9e | 706 | |
0aded708 | 707 | if (desc->page_index == 0) { |
8cd51a0c | 708 | desc->current_index = 0; |
0aded708 TM |
709 | desc->last_cookie = 0; |
710 | } | |
47c716cb | 711 | do { |
d1bacf9e | 712 | res = find_cache_page(desc); |
47c716cb | 713 | } while (res == -EAGAIN); |
1da177e4 LT |
714 | return res; |
715 | } | |
716 | ||
1da177e4 LT |
717 | /* |
718 | * Once we've found the start of the dirent within a page: fill 'er up... | |
719 | */ | |
720 | static | |
23db8620 | 721 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
722 | { |
723 | struct file *file = desc->file; | |
d1bacf9e BS |
724 | int i = 0; |
725 | int res = 0; | |
726 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
727 | struct nfs_open_dir_context *ctx = file->private_data; |
728 | ||
d1bacf9e | 729 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
730 | if (IS_ERR(array)) { |
731 | res = PTR_ERR(array); | |
732 | goto out; | |
733 | } | |
d1bacf9e BS |
734 | |
735 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 736 | struct nfs_cache_array_entry *ent; |
1da177e4 | 737 | |
ece0b423 | 738 | ent = &array->array[i]; |
23db8620 AV |
739 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
740 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 741 | desc->eof = 1; |
1da177e4 | 742 | break; |
ece0b423 | 743 | } |
23db8620 | 744 | desc->ctx->pos++; |
d1bacf9e BS |
745 | if (i < (array->size-1)) |
746 | *desc->dir_cookie = array->array[i+1].cookie; | |
747 | else | |
748 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
749 | if (ctx->duped != 0) |
750 | ctx->duped = 1; | |
1da177e4 | 751 | } |
47c716cb | 752 | if (array->eof_index >= 0) |
8cd51a0c | 753 | desc->eof = 1; |
d1bacf9e BS |
754 | |
755 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 756 | out: |
d1bacf9e | 757 | cache_page_release(desc); |
1e7cb3dc CL |
758 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
759 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
760 | return res; |
761 | } | |
762 | ||
763 | /* | |
764 | * If we cannot find a cookie in our cache, we suspect that this is | |
765 | * because it points to a deleted file, so we ask the server to return | |
766 | * whatever it thinks is the next entry. We then feed this to filldir. | |
767 | * If all goes well, we should then be able to find our way round the | |
768 | * cache on the next call to readdir_search_pagecache(); | |
769 | * | |
770 | * NOTE: we cannot add the anonymous page to the pagecache because | |
771 | * the data it contains might not be page aligned. Besides, | |
772 | * we should already have a complete representation of the | |
773 | * directory in the page cache by the time we get here. | |
774 | */ | |
775 | static inline | |
23db8620 | 776 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 777 | { |
1da177e4 LT |
778 | struct page *page = NULL; |
779 | int status; | |
496ad9aa | 780 | struct inode *inode = file_inode(desc->file); |
0c030806 | 781 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 782 | |
1e7cb3dc CL |
783 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
784 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
785 | |
786 | page = alloc_page(GFP_HIGHUSER); | |
787 | if (!page) { | |
788 | status = -ENOMEM; | |
789 | goto out; | |
790 | } | |
d1bacf9e | 791 | |
7a8e1dc3 | 792 | desc->page_index = 0; |
0aded708 | 793 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 794 | desc->page = page; |
0c030806 | 795 | ctx->duped = 0; |
7a8e1dc3 | 796 | |
85f8607e TM |
797 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
798 | if (status < 0) | |
1da177e4 LT |
799 | goto out_release; |
800 | ||
23db8620 | 801 | status = nfs_do_filldir(desc); |
1da177e4 | 802 | |
1da177e4 | 803 | out: |
1e7cb3dc | 804 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 805 | __func__, status); |
1da177e4 LT |
806 | return status; |
807 | out_release: | |
d1bacf9e | 808 | cache_page_release(desc); |
1da177e4 LT |
809 | goto out; |
810 | } | |
811 | ||
00a92642 OG |
812 | /* The file offset position represents the dirent entry number. A |
813 | last cookie cache takes care of the common case of reading the | |
814 | whole directory. | |
1da177e4 | 815 | */ |
23db8620 | 816 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 817 | { |
23db8620 | 818 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
819 | struct inode *inode = dentry->d_inode; |
820 | nfs_readdir_descriptor_t my_desc, | |
821 | *desc = &my_desc; | |
23db8620 | 822 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 823 | int res = 0; |
1da177e4 | 824 | |
6da24bc9 | 825 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc | 826 | dentry->d_parent->d_name.name, dentry->d_name.name, |
23db8620 | 827 | (long long)ctx->pos); |
91d5b470 CL |
828 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
829 | ||
1da177e4 | 830 | /* |
23db8620 | 831 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 832 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
833 | * to either find the entry with the appropriate number or |
834 | * revalidate the cookie. | |
1da177e4 LT |
835 | */ |
836 | memset(desc, 0, sizeof(*desc)); | |
837 | ||
23db8620 AV |
838 | desc->file = file; |
839 | desc->ctx = ctx; | |
480c2006 | 840 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 841 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 842 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 843 | |
565277f6 | 844 | nfs_block_sillyrename(dentry); |
07b5ce8e SM |
845 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) |
846 | res = nfs_revalidate_mapping(inode, file->f_mapping); | |
fccca7fc TM |
847 | if (res < 0) |
848 | goto out; | |
849 | ||
47c716cb | 850 | do { |
1da177e4 | 851 | res = readdir_search_pagecache(desc); |
00a92642 | 852 | |
1da177e4 | 853 | if (res == -EBADCOOKIE) { |
ece0b423 | 854 | res = 0; |
1da177e4 | 855 | /* This means either end of directory */ |
d1bacf9e | 856 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 857 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 858 | res = uncached_readdir(desc); |
ece0b423 | 859 | if (res == 0) |
1da177e4 LT |
860 | continue; |
861 | } | |
1da177e4 LT |
862 | break; |
863 | } | |
864 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 865 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 866 | nfs_zap_caches(inode); |
baf57a09 | 867 | desc->page_index = 0; |
1da177e4 | 868 | desc->plus = 0; |
d1bacf9e | 869 | desc->eof = 0; |
1da177e4 LT |
870 | continue; |
871 | } | |
872 | if (res < 0) | |
873 | break; | |
874 | ||
23db8620 | 875 | res = nfs_do_filldir(desc); |
ece0b423 | 876 | if (res < 0) |
1da177e4 | 877 | break; |
47c716cb | 878 | } while (!desc->eof); |
fccca7fc | 879 | out: |
565277f6 | 880 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
881 | if (res > 0) |
882 | res = 0; | |
aa49b4cf | 883 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
884 | dentry->d_parent->d_name.name, dentry->d_name.name, |
885 | res); | |
886 | return res; | |
1da177e4 LT |
887 | } |
888 | ||
965c8e59 | 889 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 890 | { |
b84e06c5 CL |
891 | struct dentry *dentry = filp->f_path.dentry; |
892 | struct inode *inode = dentry->d_inode; | |
480c2006 | 893 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 894 | |
6da24bc9 | 895 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
896 | dentry->d_parent->d_name.name, |
897 | dentry->d_name.name, | |
965c8e59 | 898 | offset, whence); |
b84e06c5 CL |
899 | |
900 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 901 | switch (whence) { |
f0dd2136 TM |
902 | case 1: |
903 | offset += filp->f_pos; | |
904 | case 0: | |
905 | if (offset >= 0) | |
906 | break; | |
907 | default: | |
908 | offset = -EINVAL; | |
909 | goto out; | |
910 | } | |
911 | if (offset != filp->f_pos) { | |
912 | filp->f_pos = offset; | |
480c2006 | 913 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 914 | dir_ctx->duped = 0; |
f0dd2136 TM |
915 | } |
916 | out: | |
b84e06c5 | 917 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
918 | return offset; |
919 | } | |
920 | ||
1da177e4 LT |
921 | /* |
922 | * All directory operations under NFS are synchronous, so fsync() | |
923 | * is a dummy operation. | |
924 | */ | |
02c24a82 JB |
925 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
926 | int datasync) | |
1da177e4 | 927 | { |
7ea80859 | 928 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 929 | struct inode *inode = dentry->d_inode; |
7ea80859 | 930 | |
6da24bc9 | 931 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
932 | dentry->d_parent->d_name.name, dentry->d_name.name, |
933 | datasync); | |
934 | ||
02c24a82 | 935 | mutex_lock(&inode->i_mutex); |
54917786 | 936 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 937 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
938 | return 0; |
939 | } | |
940 | ||
bfc69a45 TM |
941 | /** |
942 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
943 | * @dir - pointer to directory inode | |
944 | * | |
945 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
946 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
947 | * on the server that might have invalidated our dcache. | |
948 | * | |
949 | * The caller should be holding dir->i_lock | |
950 | */ | |
951 | void nfs_force_lookup_revalidate(struct inode *dir) | |
952 | { | |
011935a0 | 953 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 954 | } |
89d77c8f | 955 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 956 | |
1da177e4 LT |
957 | /* |
958 | * A check for whether or not the parent directory has changed. | |
959 | * In the case it has, we assume that the dentries are untrustworthy | |
960 | * and may need to be looked up again. | |
961 | */ | |
c79ba787 | 962 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
963 | { |
964 | if (IS_ROOT(dentry)) | |
965 | return 1; | |
4eec952e TM |
966 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
967 | return 0; | |
f2c77f4e TM |
968 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
969 | return 0; | |
970 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
971 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
972 | return 0; | |
973 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
974 | return 0; | |
975 | return 1; | |
1da177e4 LT |
976 | } |
977 | ||
a12802ca TM |
978 | /* |
979 | * Use intent information to check whether or not we're going to do | |
980 | * an O_EXCL create using this path component. | |
981 | */ | |
fa3c56bb | 982 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
983 | { |
984 | if (NFS_PROTO(dir)->version == 2) | |
985 | return 0; | |
fa3c56bb | 986 | return flags & LOOKUP_EXCL; |
a12802ca TM |
987 | } |
988 | ||
1d6757fb TM |
989 | /* |
990 | * Inode and filehandle revalidation for lookups. | |
991 | * | |
992 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
993 | * or if the intent information indicates that we're about to open this | |
994 | * particular file and the "nocto" mount flag is not set. | |
995 | * | |
996 | */ | |
65a0c149 | 997 | static |
fa3c56bb | 998 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
999 | { |
1000 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1001 | int ret; |
1da177e4 | 1002 | |
36d43a43 | 1003 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1004 | return 0; |
facc3530 | 1005 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1006 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1007 | goto out_force; |
1008 | /* This is an open(2) */ | |
fa3c56bb AV |
1009 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1010 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1011 | goto out_force; |
65a0c149 TM |
1012 | out: |
1013 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1014 | out_force: |
65a0c149 TM |
1015 | ret = __nfs_revalidate_inode(server, inode); |
1016 | if (ret != 0) | |
1017 | return ret; | |
1018 | goto out; | |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * We judge how long we want to trust negative | |
1023 | * dentries by looking at the parent inode mtime. | |
1024 | * | |
1025 | * If parent mtime has changed, we revalidate, else we wait for a | |
1026 | * period corresponding to the parent's attribute cache timeout value. | |
1027 | */ | |
1028 | static inline | |
1029 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1030 | unsigned int flags) |
1da177e4 | 1031 | { |
1da177e4 | 1032 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1033 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1034 | return 0; |
4eec952e TM |
1035 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1036 | return 1; | |
1da177e4 LT |
1037 | return !nfs_check_verifier(dir, dentry); |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * This is called every time the dcache has a lookup hit, | |
1042 | * and we should check whether we can really trust that | |
1043 | * lookup. | |
1044 | * | |
1045 | * NOTE! The hit can be a negative hit too, don't assume | |
1046 | * we have an inode! | |
1047 | * | |
1048 | * If the parent directory is seen to have changed, we throw out the | |
1049 | * cached dentry and do a new lookup. | |
1050 | */ | |
0b728e19 | 1051 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1052 | { |
1053 | struct inode *dir; | |
1054 | struct inode *inode; | |
1055 | struct dentry *parent; | |
e1fb4d05 TM |
1056 | struct nfs_fh *fhandle = NULL; |
1057 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1058 | struct nfs4_label *label = NULL; |
1da177e4 | 1059 | int error; |
1da177e4 | 1060 | |
fa3c56bb | 1061 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1062 | return -ECHILD; |
1063 | ||
1da177e4 | 1064 | parent = dget_parent(dentry); |
1da177e4 | 1065 | dir = parent->d_inode; |
91d5b470 | 1066 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1067 | inode = dentry->d_inode; |
1068 | ||
1069 | if (!inode) { | |
fa3c56bb | 1070 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1071 | goto out_bad; |
d69ee9b8 | 1072 | goto out_valid_noent; |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1076 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1077 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1078 | dentry->d_name.name); |
1da177e4 LT |
1079 | goto out_bad; |
1080 | } | |
1081 | ||
011e2a7f | 1082 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1083 | goto out_set_verifier; |
1084 | ||
1da177e4 | 1085 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1086 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1087 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1088 | goto out_zap_parent; |
1089 | goto out_valid; | |
1090 | } | |
1091 | ||
1092 | if (NFS_STALE(inode)) | |
1093 | goto out_bad; | |
1094 | ||
e1fb4d05 TM |
1095 | error = -ENOMEM; |
1096 | fhandle = nfs_alloc_fhandle(); | |
1097 | fattr = nfs_alloc_fattr(); | |
1098 | if (fhandle == NULL || fattr == NULL) | |
1099 | goto out_error; | |
1100 | ||
14c43f76 DQ |
1101 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1102 | if (IS_ERR(label)) | |
1103 | goto out_error; | |
1104 | ||
6e0d0be7 | 1105 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
1775fd3e | 1106 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
6e0d0be7 | 1107 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
1da177e4 LT |
1108 | if (error) |
1109 | goto out_bad; | |
e1fb4d05 | 1110 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1111 | goto out_bad; |
e1fb4d05 | 1112 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1113 | goto out_bad; |
1114 | ||
aa9c2669 DQ |
1115 | nfs_setsecurity(inode, fattr, label); |
1116 | ||
e1fb4d05 TM |
1117 | nfs_free_fattr(fattr); |
1118 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1119 | nfs4_label_free(label); |
1120 | ||
15860ab1 | 1121 | out_set_verifier: |
cf8ba45e | 1122 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1123 | out_valid: |
d69ee9b8 TM |
1124 | /* Success: notify readdir to use READDIRPLUS */ |
1125 | nfs_advise_use_readdirplus(dir); | |
1126 | out_valid_noent: | |
1da177e4 | 1127 | dput(parent); |
1e7cb3dc | 1128 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1129 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1130 | dentry->d_name.name); |
1da177e4 LT |
1131 | return 1; |
1132 | out_zap_parent: | |
1133 | nfs_zap_caches(dir); | |
1134 | out_bad: | |
c44600c9 AV |
1135 | nfs_free_fattr(fattr); |
1136 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1137 | nfs4_label_free(label); |
a1643a92 | 1138 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1139 | if (inode && S_ISDIR(inode->i_mode)) { |
1140 | /* Purge readdir caches. */ | |
1141 | nfs_zap_caches(inode); | |
a3f432bf BF |
1142 | /* |
1143 | * We can't d_drop the root of a disconnected tree: | |
1144 | * its d_hash is on the s_anon list and d_drop() would hide | |
1145 | * it from shrink_dcache_for_unmount(), leading to busy | |
1146 | * inodes on unmount and further oopses. | |
1147 | */ | |
1148 | if (IS_ROOT(dentry)) | |
d9e80b7d | 1149 | goto out_valid; |
1da177e4 | 1150 | } |
13caa9fb MS |
1151 | /* If we have submounts, don't unhash ! */ |
1152 | if (check_submounts_and_drop(dentry) != 0) | |
1153 | goto out_valid; | |
1154 | ||
1da177e4 | 1155 | dput(parent); |
1e7cb3dc | 1156 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1157 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1158 | dentry->d_name.name); |
1da177e4 | 1159 | return 0; |
e1fb4d05 TM |
1160 | out_error: |
1161 | nfs_free_fattr(fattr); | |
1162 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1163 | nfs4_label_free(label); |
e1fb4d05 TM |
1164 | dput(parent); |
1165 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1166 | __func__, dentry->d_parent->d_name.name, | |
1167 | dentry->d_name.name, error); | |
1168 | return error; | |
1da177e4 LT |
1169 | } |
1170 | ||
ecf3d1f1 JL |
1171 | /* |
1172 | * A weaker form of d_revalidate for revalidating just the dentry->d_inode | |
1173 | * when we don't really care about the dentry name. This is called when a | |
1174 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1175 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1176 | * | |
1177 | * In this situation, we just want to verify that the inode itself is OK | |
1178 | * since the dentry might have changed on the server. | |
1179 | */ | |
1180 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1181 | { | |
1182 | int error; | |
1183 | struct inode *inode = dentry->d_inode; | |
1184 | ||
1185 | /* | |
1186 | * I believe we can only get a negative dentry here in the case of a | |
1187 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1188 | * eventually need to do something more here. | |
1189 | */ | |
1190 | if (!inode) { | |
1191 | dfprintk(LOOKUPCACHE, "%s: %s/%s has negative inode\n", | |
1192 | __func__, dentry->d_parent->d_name.name, | |
1193 | dentry->d_name.name); | |
1194 | return 1; | |
1195 | } | |
1196 | ||
1197 | if (is_bad_inode(inode)) { | |
1198 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", | |
1199 | __func__, dentry->d_parent->d_name.name, | |
1200 | dentry->d_name.name); | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1205 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1206 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1207 | return !error; | |
1208 | } | |
1209 | ||
1da177e4 LT |
1210 | /* |
1211 | * This is called from dput() when d_count is going to 0. | |
1212 | */ | |
fe15ce44 | 1213 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1214 | { |
1215 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1216 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1217 | dentry->d_flags); | |
1218 | ||
77f11192 TM |
1219 | /* Unhash any dentry with a stale inode */ |
1220 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1221 | return 1; | |
1222 | ||
1da177e4 LT |
1223 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1224 | /* Unhash it, so that ->d_iput() would be called */ | |
1225 | return 1; | |
1226 | } | |
1227 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1228 | /* Unhash it, so that ancestors of killed async unlink | |
1229 | * files will be cleaned up during umount */ | |
1230 | return 1; | |
1231 | } | |
1232 | return 0; | |
1233 | ||
1234 | } | |
1235 | ||
1f018458 | 1236 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1237 | static void nfs_drop_nlink(struct inode *inode) |
1238 | { | |
1239 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1240 | /* drop the inode if we're reasonably sure this is the last link */ |
1241 | if (inode->i_nlink == 1) | |
1242 | clear_nlink(inode); | |
1243 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1244 | spin_unlock(&inode->i_lock); |
1245 | } | |
1246 | ||
1da177e4 LT |
1247 | /* |
1248 | * Called when the dentry loses inode. | |
1249 | * We use it to clean up silly-renamed files. | |
1250 | */ | |
1251 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1252 | { | |
83672d39 NB |
1253 | if (S_ISDIR(inode->i_mode)) |
1254 | /* drop any readdir cache as it could easily be old */ | |
1255 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1256 | ||
1da177e4 | 1257 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1258 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1259 | nfs_drop_nlink(inode); |
1da177e4 | 1260 | } |
1da177e4 LT |
1261 | iput(inode); |
1262 | } | |
1263 | ||
b1942c5f AV |
1264 | static void nfs_d_release(struct dentry *dentry) |
1265 | { | |
1266 | /* free cached devname value, if it survived that far */ | |
1267 | if (unlikely(dentry->d_fsdata)) { | |
1268 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1269 | WARN_ON(1); | |
1270 | else | |
1271 | kfree(dentry->d_fsdata); | |
1272 | } | |
1273 | } | |
1274 | ||
f786aa90 | 1275 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1276 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1277 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1278 | .d_delete = nfs_dentry_delete, |
1279 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1280 | .d_automount = nfs_d_automount, |
b1942c5f | 1281 | .d_release = nfs_d_release, |
1da177e4 | 1282 | }; |
ddda8e0a | 1283 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1284 | |
597d9289 | 1285 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1286 | { |
1287 | struct dentry *res; | |
565277f6 | 1288 | struct dentry *parent; |
1da177e4 | 1289 | struct inode *inode = NULL; |
e1fb4d05 TM |
1290 | struct nfs_fh *fhandle = NULL; |
1291 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1292 | struct nfs4_label *label = NULL; |
1da177e4 | 1293 | int error; |
1da177e4 LT |
1294 | |
1295 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1296 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1297 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1298 | |
1299 | res = ERR_PTR(-ENAMETOOLONG); | |
1300 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1301 | goto out; | |
1302 | ||
fd684071 TM |
1303 | /* |
1304 | * If we're doing an exclusive create, optimize away the lookup | |
1305 | * but don't hash the dentry. | |
1306 | */ | |
00cd8dd3 | 1307 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1308 | d_instantiate(dentry, NULL); |
1309 | res = NULL; | |
fc0f684c | 1310 | goto out; |
fd684071 | 1311 | } |
1da177e4 | 1312 | |
e1fb4d05 TM |
1313 | res = ERR_PTR(-ENOMEM); |
1314 | fhandle = nfs_alloc_fhandle(); | |
1315 | fattr = nfs_alloc_fattr(); | |
1316 | if (fhandle == NULL || fattr == NULL) | |
1317 | goto out; | |
1318 | ||
14c43f76 DQ |
1319 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1320 | if (IS_ERR(label)) | |
1321 | goto out; | |
1322 | ||
565277f6 TM |
1323 | parent = dentry->d_parent; |
1324 | /* Protect against concurrent sillydeletes */ | |
6e0d0be7 | 1325 | trace_nfs_lookup_enter(dir, dentry, flags); |
565277f6 | 1326 | nfs_block_sillyrename(parent); |
1775fd3e | 1327 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1328 | if (error == -ENOENT) |
1329 | goto no_entry; | |
1330 | if (error < 0) { | |
1331 | res = ERR_PTR(error); | |
565277f6 | 1332 | goto out_unblock_sillyrename; |
1da177e4 | 1333 | } |
1775fd3e | 1334 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1335 | res = ERR_CAST(inode); |
03f28e3a | 1336 | if (IS_ERR(res)) |
565277f6 | 1337 | goto out_unblock_sillyrename; |
54ceac45 | 1338 | |
d69ee9b8 TM |
1339 | /* Success: notify readdir to use READDIRPLUS */ |
1340 | nfs_advise_use_readdirplus(dir); | |
1341 | ||
1da177e4 | 1342 | no_entry: |
54ceac45 | 1343 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1344 | if (res != NULL) { |
1345 | if (IS_ERR(res)) | |
565277f6 | 1346 | goto out_unblock_sillyrename; |
1da177e4 | 1347 | dentry = res; |
9eaef27b | 1348 | } |
1da177e4 | 1349 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1350 | out_unblock_sillyrename: |
1351 | nfs_unblock_sillyrename(parent); | |
6e0d0be7 | 1352 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1353 | nfs4_label_free(label); |
1da177e4 | 1354 | out: |
e1fb4d05 TM |
1355 | nfs_free_fattr(fattr); |
1356 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1357 | return res; |
1358 | } | |
ddda8e0a | 1359 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1360 | |
89d77c8f | 1361 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1362 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1363 | |
f786aa90 | 1364 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1365 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1366 | .d_delete = nfs_dentry_delete, |
1367 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1368 | .d_automount = nfs_d_automount, |
b1942c5f | 1369 | .d_release = nfs_d_release, |
1da177e4 | 1370 | }; |
89d77c8f | 1371 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1372 | |
8a5e929d AV |
1373 | static fmode_t flags_to_mode(int flags) |
1374 | { | |
1375 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1376 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1377 | res |= FMODE_READ; | |
1378 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1379 | res |= FMODE_WRITE; | |
1380 | return res; | |
1381 | } | |
1382 | ||
51141598 | 1383 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1384 | { |
5ede7b1c | 1385 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1386 | } |
1387 | ||
1388 | static int do_open(struct inode *inode, struct file *filp) | |
1389 | { | |
1390 | nfs_fscache_set_inode_cookie(inode, filp); | |
1391 | return 0; | |
1392 | } | |
1393 | ||
d9585277 AV |
1394 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1395 | struct dentry *dentry, | |
30d90494 | 1396 | struct file *file, unsigned open_flags, |
d9585277 | 1397 | int *opened) |
cd9a1c0e | 1398 | { |
0dd2b474 MS |
1399 | int err; |
1400 | ||
01c919ab MS |
1401 | if ((open_flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
1402 | *opened |= FILE_CREATED; | |
1403 | ||
30d90494 AV |
1404 | err = finish_open(file, dentry, do_open, opened); |
1405 | if (err) | |
d9585277 | 1406 | goto out; |
30d90494 | 1407 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1408 | |
cd9a1c0e | 1409 | out: |
d9585277 | 1410 | return err; |
cd9a1c0e TM |
1411 | } |
1412 | ||
73a79706 BS |
1413 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1414 | struct file *file, unsigned open_flags, | |
1415 | umode_t mode, int *opened) | |
1da177e4 | 1416 | { |
cd9a1c0e | 1417 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1418 | struct dentry *res; |
1419 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1420 | struct inode *inode; |
1472b83e | 1421 | unsigned int lookup_flags = 0; |
898f635c | 1422 | int err; |
1da177e4 | 1423 | |
0dd2b474 MS |
1424 | /* Expect a negative dentry */ |
1425 | BUG_ON(dentry->d_inode); | |
1426 | ||
1427 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1428 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1429 | ||
9597c13b JL |
1430 | err = nfs_check_flags(open_flags); |
1431 | if (err) | |
1432 | return err; | |
1433 | ||
0dd2b474 MS |
1434 | /* NFS only supports OPEN on regular files */ |
1435 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1436 | if (!d_unhashed(dentry)) { |
1437 | /* | |
1438 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1439 | * revalidated and is fine, no need to perform lookup | |
1440 | * again | |
1441 | */ | |
d9585277 | 1442 | return -ENOENT; |
0dd2b474 | 1443 | } |
1472b83e | 1444 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1445 | goto no_open; |
02a913a7 | 1446 | } |
1da177e4 | 1447 | |
0dd2b474 | 1448 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1449 | return -ENAMETOOLONG; |
cd9a1c0e | 1450 | |
0dd2b474 | 1451 | if (open_flags & O_CREAT) { |
536e43d1 | 1452 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1453 | attr.ia_mode = mode & ~current_umask(); |
1454 | } | |
536e43d1 TM |
1455 | if (open_flags & O_TRUNC) { |
1456 | attr.ia_valid |= ATTR_SIZE; | |
1457 | attr.ia_size = 0; | |
cd9a1c0e TM |
1458 | } |
1459 | ||
0dd2b474 MS |
1460 | ctx = create_nfs_open_context(dentry, open_flags); |
1461 | err = PTR_ERR(ctx); | |
1462 | if (IS_ERR(ctx)) | |
d9585277 | 1463 | goto out; |
0dd2b474 | 1464 | |
6e0d0be7 | 1465 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
f46e0bd3 | 1466 | nfs_block_sillyrename(dentry->d_parent); |
5bc2afc2 | 1467 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened); |
275bb307 | 1468 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1469 | if (IS_ERR(inode)) { |
0dd2b474 | 1470 | err = PTR_ERR(inode); |
6e0d0be7 | 1471 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1472 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1473 | switch (err) { |
1474 | case -ENOENT: | |
275bb307 | 1475 | d_drop(dentry); |
0dd2b474 MS |
1476 | d_add(dentry, NULL); |
1477 | break; | |
1478 | case -EISDIR: | |
1479 | case -ENOTDIR: | |
1480 | goto no_open; | |
1481 | case -ELOOP: | |
1482 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1483 | goto no_open; |
0dd2b474 | 1484 | break; |
1da177e4 | 1485 | /* case -EINVAL: */ |
0dd2b474 MS |
1486 | default: |
1487 | break; | |
1da177e4 | 1488 | } |
d9585277 | 1489 | goto out; |
cd9a1c0e | 1490 | } |
0dd2b474 | 1491 | |
275bb307 | 1492 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
6e0d0be7 | 1493 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1494 | put_nfs_open_context(ctx); |
d9585277 AV |
1495 | out: |
1496 | return err; | |
0dd2b474 | 1497 | |
1da177e4 | 1498 | no_open: |
1472b83e | 1499 | res = nfs_lookup(dir, dentry, lookup_flags); |
0dd2b474 MS |
1500 | err = PTR_ERR(res); |
1501 | if (IS_ERR(res)) | |
d9585277 | 1502 | goto out; |
0dd2b474 | 1503 | |
e45198a6 | 1504 | return finish_no_open(file, res); |
1da177e4 | 1505 | } |
89d77c8f | 1506 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1507 | |
0b728e19 | 1508 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1509 | { |
1510 | struct dentry *parent = NULL; | |
657e94b6 | 1511 | struct inode *inode; |
1da177e4 | 1512 | struct inode *dir; |
50de348c | 1513 | int ret = 0; |
1da177e4 | 1514 | |
fa3c56bb | 1515 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1516 | return -ECHILD; |
1517 | ||
fa3c56bb | 1518 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1519 | goto no_open; |
1520 | if (d_mountpoint(dentry)) | |
5584c306 | 1521 | goto no_open; |
49f9a0fa TM |
1522 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1523 | goto no_open; | |
2b484297 | 1524 | |
eda72afb | 1525 | inode = dentry->d_inode; |
1da177e4 LT |
1526 | parent = dget_parent(dentry); |
1527 | dir = parent->d_inode; | |
2b484297 | 1528 | |
1da177e4 LT |
1529 | /* We can't create new files in nfs_open_revalidate(), so we |
1530 | * optimize away revalidation of negative dentries. | |
1531 | */ | |
216d5d06 | 1532 | if (inode == NULL) { |
fa3c56bb | 1533 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1534 | ret = 1; |
1da177e4 | 1535 | goto out; |
216d5d06 TM |
1536 | } |
1537 | ||
1da177e4 LT |
1538 | /* NFS only supports OPEN on regular files */ |
1539 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1540 | goto no_open_dput; |
1da177e4 | 1541 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1542 | if (flags & LOOKUP_EXCL) |
5584c306 | 1543 | goto no_open_dput; |
1da177e4 | 1544 | |
0ef97dcf MS |
1545 | /* Let f_op->open() actually open (and revalidate) the file */ |
1546 | ret = 1; | |
536e43d1 | 1547 | |
1da177e4 LT |
1548 | out: |
1549 | dput(parent); | |
1da177e4 | 1550 | return ret; |
535918f1 | 1551 | |
5584c306 | 1552 | no_open_dput: |
1da177e4 | 1553 | dput(parent); |
5584c306 | 1554 | no_open: |
0b728e19 | 1555 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1556 | } |
1557 | ||
1da177e4 LT |
1558 | #endif /* CONFIG_NFSV4 */ |
1559 | ||
1da177e4 LT |
1560 | /* |
1561 | * Code common to create, mkdir, and mknod. | |
1562 | */ | |
1563 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1564 | struct nfs_fattr *fattr, |
1565 | struct nfs4_label *label) | |
1da177e4 | 1566 | { |
fab728e1 TM |
1567 | struct dentry *parent = dget_parent(dentry); |
1568 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1569 | struct inode *inode; |
1570 | int error = -EACCES; | |
1571 | ||
fab728e1 TM |
1572 | d_drop(dentry); |
1573 | ||
1da177e4 LT |
1574 | /* We may have been initialized further down */ |
1575 | if (dentry->d_inode) | |
fab728e1 | 1576 | goto out; |
1da177e4 | 1577 | if (fhandle->size == 0) { |
1775fd3e | 1578 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1579 | if (error) |
fab728e1 | 1580 | goto out_error; |
1da177e4 | 1581 | } |
5724ab37 | 1582 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1583 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1584 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1585 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1586 | if (error < 0) |
fab728e1 | 1587 | goto out_error; |
1da177e4 | 1588 | } |
1775fd3e | 1589 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1590 | error = PTR_ERR(inode); |
1591 | if (IS_ERR(inode)) | |
fab728e1 TM |
1592 | goto out_error; |
1593 | d_add(dentry, inode); | |
1594 | out: | |
1595 | dput(parent); | |
1da177e4 | 1596 | return 0; |
fab728e1 TM |
1597 | out_error: |
1598 | nfs_mark_for_revalidate(dir); | |
1599 | dput(parent); | |
1600 | return error; | |
1da177e4 | 1601 | } |
ddda8e0a | 1602 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1603 | |
1604 | /* | |
1605 | * Following a failed create operation, we drop the dentry rather | |
1606 | * than retain a negative dentry. This avoids a problem in the event | |
1607 | * that the operation succeeded on the server, but an error in the | |
1608 | * reply path made it appear to have failed. | |
1609 | */ | |
597d9289 | 1610 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1611 | umode_t mode, bool excl) |
1da177e4 LT |
1612 | { |
1613 | struct iattr attr; | |
ebfc3b49 | 1614 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1615 | int error; |
1da177e4 | 1616 | |
1e7cb3dc CL |
1617 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1618 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1619 | |
1620 | attr.ia_mode = mode; | |
1621 | attr.ia_valid = ATTR_MODE; | |
1622 | ||
8b0ad3d4 | 1623 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1624 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1625 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1626 | if (error != 0) |
1627 | goto out_err; | |
1da177e4 LT |
1628 | return 0; |
1629 | out_err: | |
1da177e4 LT |
1630 | d_drop(dentry); |
1631 | return error; | |
1632 | } | |
ddda8e0a | 1633 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1634 | |
1635 | /* | |
1636 | * See comments for nfs_proc_create regarding failed operations. | |
1637 | */ | |
597d9289 | 1638 | int |
1a67aafb | 1639 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1640 | { |
1641 | struct iattr attr; | |
1642 | int status; | |
1643 | ||
1e7cb3dc CL |
1644 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1645 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1646 | |
1647 | if (!new_valid_dev(rdev)) | |
1648 | return -EINVAL; | |
1649 | ||
1650 | attr.ia_mode = mode; | |
1651 | attr.ia_valid = ATTR_MODE; | |
1652 | ||
1ca42382 | 1653 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1654 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1655 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1656 | if (status != 0) |
1657 | goto out_err; | |
1da177e4 LT |
1658 | return 0; |
1659 | out_err: | |
1da177e4 LT |
1660 | d_drop(dentry); |
1661 | return status; | |
1662 | } | |
ddda8e0a | 1663 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1664 | |
1665 | /* | |
1666 | * See comments for nfs_proc_create regarding failed operations. | |
1667 | */ | |
597d9289 | 1668 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1669 | { |
1670 | struct iattr attr; | |
1671 | int error; | |
1672 | ||
1e7cb3dc CL |
1673 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1674 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1675 | |
1676 | attr.ia_valid = ATTR_MODE; | |
1677 | attr.ia_mode = mode | S_IFDIR; | |
1678 | ||
1ca42382 | 1679 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1680 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1681 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1682 | if (error != 0) |
1683 | goto out_err; | |
1da177e4 LT |
1684 | return 0; |
1685 | out_err: | |
1686 | d_drop(dentry); | |
1da177e4 LT |
1687 | return error; |
1688 | } | |
ddda8e0a | 1689 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1690 | |
d45b9d8b TM |
1691 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1692 | { | |
1693 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1694 | d_delete(dentry); | |
1695 | } | |
1696 | ||
597d9289 | 1697 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1698 | { |
1699 | int error; | |
1700 | ||
1e7cb3dc CL |
1701 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1702 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1703 | |
1ca42382 | 1704 | trace_nfs_rmdir_enter(dir, dentry); |
ba6c0592 TM |
1705 | if (dentry->d_inode) { |
1706 | nfs_wait_on_sillyrename(dentry); | |
1707 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1708 | /* Ensure the VFS deletes this inode */ | |
1709 | switch (error) { | |
1710 | case 0: | |
1711 | clear_nlink(dentry->d_inode); | |
1712 | break; | |
1713 | case -ENOENT: | |
1714 | nfs_dentry_handle_enoent(dentry); | |
1715 | } | |
1716 | } else | |
1717 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1718 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1719 | |
1720 | return error; | |
1721 | } | |
ddda8e0a | 1722 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1723 | |
1da177e4 LT |
1724 | /* |
1725 | * Remove a file after making sure there are no pending writes, | |
1726 | * and after checking that the file has only one user. | |
1727 | * | |
1728 | * We invalidate the attribute cache and free the inode prior to the operation | |
1729 | * to avoid possible races if the server reuses the inode. | |
1730 | */ | |
1731 | static int nfs_safe_remove(struct dentry *dentry) | |
1732 | { | |
1733 | struct inode *dir = dentry->d_parent->d_inode; | |
1734 | struct inode *inode = dentry->d_inode; | |
1735 | int error = -EBUSY; | |
1736 | ||
1737 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1738 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1739 | ||
1740 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1741 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1742 | error = 0; | |
1743 | goto out; | |
1744 | } | |
1745 | ||
1ca42382 | 1746 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1747 | if (inode != NULL) { |
57ec14c5 | 1748 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1749 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1750 | if (error == 0) |
1b83d707 | 1751 | nfs_drop_nlink(inode); |
1da177e4 LT |
1752 | } else |
1753 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1754 | if (error == -ENOENT) |
1755 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1756 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1757 | out: |
1758 | return error; | |
1759 | } | |
1760 | ||
1761 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1762 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1763 | * | |
1764 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1765 | */ | |
597d9289 | 1766 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1767 | { |
1768 | int error; | |
1769 | int need_rehash = 0; | |
1770 | ||
1771 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1772 | dir->i_ino, dentry->d_name.name); | |
1773 | ||
1ca42382 | 1774 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1775 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1776 | if (d_count(dentry) > 1) { |
1da177e4 | 1777 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1778 | /* Start asynchronous writeout of the inode */ |
1779 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1780 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1781 | goto out; |
1da177e4 LT |
1782 | } |
1783 | if (!d_unhashed(dentry)) { | |
1784 | __d_drop(dentry); | |
1785 | need_rehash = 1; | |
1786 | } | |
1787 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1788 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1789 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1790 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1791 | } else if (need_rehash) | |
1792 | d_rehash(dentry); | |
1ca42382 TM |
1793 | out: |
1794 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1795 | return error; |
1796 | } | |
ddda8e0a | 1797 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1798 | |
873101b3 CL |
1799 | /* |
1800 | * To create a symbolic link, most file systems instantiate a new inode, | |
1801 | * add a page to it containing the path, then write it out to the disk | |
1802 | * using prepare_write/commit_write. | |
1803 | * | |
1804 | * Unfortunately the NFS client can't create the in-core inode first | |
1805 | * because it needs a file handle to create an in-core inode (see | |
1806 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1807 | * symlink request has completed on the server. | |
1808 | * | |
1809 | * So instead we allocate a raw page, copy the symname into it, then do | |
1810 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1811 | * now have a new file handle and can instantiate an in-core NFS inode | |
1812 | * and move the raw page into its mapping. | |
1813 | */ | |
597d9289 | 1814 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1815 | { |
873101b3 CL |
1816 | struct page *page; |
1817 | char *kaddr; | |
1da177e4 | 1818 | struct iattr attr; |
873101b3 | 1819 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1820 | int error; |
1821 | ||
1822 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1823 | dir->i_ino, dentry->d_name.name, symname); | |
1824 | ||
873101b3 CL |
1825 | if (pathlen > PAGE_SIZE) |
1826 | return -ENAMETOOLONG; | |
1da177e4 | 1827 | |
873101b3 CL |
1828 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1829 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1830 | |
83d93f22 | 1831 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1832 | if (!page) |
873101b3 | 1833 | return -ENOMEM; |
873101b3 | 1834 | |
2b86ce2d | 1835 | kaddr = kmap_atomic(page); |
873101b3 CL |
1836 | memcpy(kaddr, symname, pathlen); |
1837 | if (pathlen < PAGE_SIZE) | |
1838 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1839 | kunmap_atomic(kaddr); |
873101b3 | 1840 | |
1ca42382 | 1841 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 1842 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 1843 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 CL |
1844 | if (error != 0) { |
1845 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1846 | dir->i_sb->s_id, dir->i_ino, | |
1847 | dentry->d_name.name, symname, error); | |
1da177e4 | 1848 | d_drop(dentry); |
873101b3 | 1849 | __free_page(page); |
873101b3 CL |
1850 | return error; |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * No big deal if we can't add this page to the page cache here. | |
1855 | * READLINK will get the missing page from the server if needed. | |
1856 | */ | |
a0b8cab3 | 1857 | if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0, |
873101b3 | 1858 | GFP_KERNEL)) { |
873101b3 CL |
1859 | SetPageUptodate(page); |
1860 | unlock_page(page); | |
1861 | } else | |
1862 | __free_page(page); | |
1863 | ||
873101b3 | 1864 | return 0; |
1da177e4 | 1865 | } |
ddda8e0a | 1866 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1867 | |
597d9289 | 1868 | int |
1da177e4 LT |
1869 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1870 | { | |
1871 | struct inode *inode = old_dentry->d_inode; | |
1872 | int error; | |
1873 | ||
1874 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1875 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1876 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1877 | ||
1fd1085b | 1878 | trace_nfs_link_enter(inode, dir, dentry); |
57ec14c5 | 1879 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1880 | |
9697d234 | 1881 | d_drop(dentry); |
1da177e4 | 1882 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1883 | if (error == 0) { |
7de9c6ee | 1884 | ihold(inode); |
9697d234 | 1885 | d_add(dentry, inode); |
cf809556 | 1886 | } |
1fd1085b | 1887 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
1888 | return error; |
1889 | } | |
ddda8e0a | 1890 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1891 | |
1892 | /* | |
1893 | * RENAME | |
1894 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1895 | * different file handle for the same inode after a rename (e.g. when | |
1896 | * moving to a different directory). A fail-safe method to do so would | |
1897 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1898 | * rename the old file using the sillyrename stuff. This way, the original | |
1899 | * file in old_dir will go away when the last process iput()s the inode. | |
1900 | * | |
1901 | * FIXED. | |
1902 | * | |
1903 | * It actually works quite well. One needs to have the possibility for | |
1904 | * at least one ".nfs..." file in each directory the file ever gets | |
1905 | * moved or linked to which happens automagically with the new | |
1906 | * implementation that only depends on the dcache stuff instead of | |
1907 | * using the inode layer | |
1908 | * | |
1909 | * Unfortunately, things are a little more complicated than indicated | |
1910 | * above. For a cross-directory move, we want to make sure we can get | |
1911 | * rid of the old inode after the operation. This means there must be | |
1912 | * no pending writes (if it's a file), and the use count must be 1. | |
1913 | * If these conditions are met, we can drop the dentries before doing | |
1914 | * the rename. | |
1915 | */ | |
597d9289 | 1916 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1917 | struct inode *new_dir, struct dentry *new_dentry) |
1918 | { | |
1919 | struct inode *old_inode = old_dentry->d_inode; | |
1920 | struct inode *new_inode = new_dentry->d_inode; | |
1921 | struct dentry *dentry = NULL, *rehash = NULL; | |
1922 | int error = -EBUSY; | |
1923 | ||
1da177e4 LT |
1924 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1925 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1926 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
84d08fa8 | 1927 | d_count(new_dentry)); |
1da177e4 | 1928 | |
70ded201 | 1929 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 1930 | /* |
28f79a1a MS |
1931 | * For non-directories, check whether the target is busy and if so, |
1932 | * make a copy of the dentry and then do a silly-rename. If the | |
1933 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1934 | * the new target. | |
1da177e4 | 1935 | */ |
27226104 MS |
1936 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1937 | /* | |
1938 | * To prevent any new references to the target during the | |
1939 | * rename, we unhash the dentry in advance. | |
1940 | */ | |
1941 | if (!d_unhashed(new_dentry)) { | |
1942 | d_drop(new_dentry); | |
1943 | rehash = new_dentry; | |
1944 | } | |
1da177e4 | 1945 | |
84d08fa8 | 1946 | if (d_count(new_dentry) > 2) { |
27226104 MS |
1947 | int err; |
1948 | ||
1949 | /* copy the target dentry's name */ | |
1950 | dentry = d_alloc(new_dentry->d_parent, | |
1951 | &new_dentry->d_name); | |
1952 | if (!dentry) | |
1953 | goto out; | |
1954 | ||
1955 | /* silly-rename the existing target ... */ | |
1956 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1957 | if (err) |
27226104 | 1958 | goto out; |
24e93025 MS |
1959 | |
1960 | new_dentry = dentry; | |
56335936 | 1961 | rehash = NULL; |
24e93025 | 1962 | new_inode = NULL; |
27226104 | 1963 | } |
b1e4adf4 | 1964 | } |
1da177e4 | 1965 | |
57ec14c5 | 1966 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1967 | if (new_inode != NULL) |
57ec14c5 | 1968 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1969 | |
1da177e4 LT |
1970 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1971 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1972 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1973 | out: |
1974 | if (rehash) | |
1975 | d_rehash(rehash); | |
70ded201 TM |
1976 | trace_nfs_rename_exit(old_dir, old_dentry, |
1977 | new_dir, new_dentry, error); | |
1da177e4 | 1978 | if (!error) { |
b1e4adf4 TM |
1979 | if (new_inode != NULL) |
1980 | nfs_drop_nlink(new_inode); | |
349457cc | 1981 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1982 | nfs_set_verifier(new_dentry, |
1983 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1984 | } else if (error == -ENOENT) |
1985 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1986 | |
1987 | /* new dentry created? */ | |
1988 | if (dentry) | |
1989 | dput(dentry); | |
1da177e4 LT |
1990 | return error; |
1991 | } | |
ddda8e0a | 1992 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 1993 | |
cfcea3e8 TM |
1994 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1995 | static LIST_HEAD(nfs_access_lru_list); | |
1996 | static atomic_long_t nfs_access_nr_entries; | |
1997 | ||
1c3c07e9 TM |
1998 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1999 | { | |
2000 | put_rpccred(entry->cred); | |
2001 | kfree(entry); | |
cfcea3e8 TM |
2002 | smp_mb__before_atomic_dec(); |
2003 | atomic_long_dec(&nfs_access_nr_entries); | |
2004 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
2005 | } |
2006 | ||
1a81bb8a TM |
2007 | static void nfs_access_free_list(struct list_head *head) |
2008 | { | |
2009 | struct nfs_access_entry *cache; | |
2010 | ||
2011 | while (!list_empty(head)) { | |
2012 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2013 | list_del(&cache->lru); | |
2014 | nfs_access_free_entry(cache); | |
2015 | } | |
2016 | } | |
2017 | ||
1ab6c499 DC |
2018 | unsigned long |
2019 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
979df72e TM |
2020 | { |
2021 | LIST_HEAD(head); | |
aa510da5 | 2022 | struct nfs_inode *nfsi, *next; |
979df72e | 2023 | struct nfs_access_entry *cache; |
1495f230 YH |
2024 | int nr_to_scan = sc->nr_to_scan; |
2025 | gfp_t gfp_mask = sc->gfp_mask; | |
1ab6c499 | 2026 | long freed = 0; |
979df72e | 2027 | |
61d5eb29 | 2028 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1ab6c499 | 2029 | return SHRINK_STOP; |
9c7e7e23 | 2030 | |
a50f7951 | 2031 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2032 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2033 | struct inode *inode; |
2034 | ||
2035 | if (nr_to_scan-- == 0) | |
2036 | break; | |
9c7e7e23 | 2037 | inode = &nfsi->vfs_inode; |
979df72e TM |
2038 | spin_lock(&inode->i_lock); |
2039 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2040 | goto remove_lru_entry; | |
2041 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2042 | struct nfs_access_entry, lru); | |
2043 | list_move(&cache->lru, &head); | |
2044 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2045 | freed++; |
979df72e TM |
2046 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2047 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2048 | &nfs_access_lru_list); | |
2049 | else { | |
2050 | remove_lru_entry: | |
2051 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2052 | smp_mb__before_clear_bit(); |
979df72e | 2053 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2054 | smp_mb__after_clear_bit(); |
979df72e | 2055 | } |
59844a9b | 2056 | spin_unlock(&inode->i_lock); |
979df72e TM |
2057 | } |
2058 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2059 | nfs_access_free_list(&head); |
1ab6c499 DC |
2060 | return freed; |
2061 | } | |
2062 | ||
2063 | unsigned long | |
2064 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2065 | { | |
55f841ce | 2066 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2067 | } |
2068 | ||
1a81bb8a | 2069 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2070 | { |
1c3c07e9 | 2071 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2072 | struct rb_node *n; |
1c3c07e9 TM |
2073 | struct nfs_access_entry *entry; |
2074 | ||
2075 | /* Unhook entries from the cache */ | |
2076 | while ((n = rb_first(root_node)) != NULL) { | |
2077 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2078 | rb_erase(n, root_node); | |
1a81bb8a | 2079 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2080 | } |
2081 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2082 | } |
2083 | ||
1c3c07e9 | 2084 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2085 | { |
1a81bb8a TM |
2086 | LIST_HEAD(head); |
2087 | ||
2088 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2089 | return; | |
cfcea3e8 | 2090 | /* Remove from global LRU init */ |
1a81bb8a TM |
2091 | spin_lock(&nfs_access_lru_lock); |
2092 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2093 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2094 | |
1c3c07e9 | 2095 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2096 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2097 | spin_unlock(&inode->i_lock); | |
2098 | spin_unlock(&nfs_access_lru_lock); | |
2099 | nfs_access_free_list(&head); | |
1c3c07e9 | 2100 | } |
1c606fb7 | 2101 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2102 | |
1c3c07e9 TM |
2103 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2104 | { | |
2105 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2106 | struct nfs_access_entry *entry; | |
2107 | ||
2108 | while (n != NULL) { | |
2109 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2110 | ||
2111 | if (cred < entry->cred) | |
2112 | n = n->rb_left; | |
2113 | else if (cred > entry->cred) | |
2114 | n = n->rb_right; | |
2115 | else | |
2116 | return entry; | |
1da177e4 | 2117 | } |
1c3c07e9 TM |
2118 | return NULL; |
2119 | } | |
2120 | ||
af22f94a | 2121 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2122 | { |
2123 | struct nfs_inode *nfsi = NFS_I(inode); | |
2124 | struct nfs_access_entry *cache; | |
2125 | int err = -ENOENT; | |
2126 | ||
dc59250c | 2127 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2128 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2129 | goto out_zap; | |
2130 | cache = nfs_access_search_rbtree(inode, cred); | |
2131 | if (cache == NULL) | |
2132 | goto out; | |
b4d2314b | 2133 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2134 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2135 | goto out_stale; |
2136 | res->jiffies = cache->jiffies; | |
2137 | res->cred = cache->cred; | |
2138 | res->mask = cache->mask; | |
cfcea3e8 | 2139 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2140 | err = 0; |
2141 | out: | |
2142 | spin_unlock(&inode->i_lock); | |
2143 | return err; | |
2144 | out_stale: | |
2145 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2146 | list_del(&cache->lru); |
1c3c07e9 TM |
2147 | spin_unlock(&inode->i_lock); |
2148 | nfs_access_free_entry(cache); | |
2149 | return -ENOENT; | |
2150 | out_zap: | |
1a81bb8a TM |
2151 | spin_unlock(&inode->i_lock); |
2152 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2153 | return -ENOENT; |
2154 | } | |
2155 | ||
2156 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2157 | { | |
cfcea3e8 TM |
2158 | struct nfs_inode *nfsi = NFS_I(inode); |
2159 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2160 | struct rb_node **p = &root_node->rb_node; |
2161 | struct rb_node *parent = NULL; | |
2162 | struct nfs_access_entry *entry; | |
2163 | ||
2164 | spin_lock(&inode->i_lock); | |
2165 | while (*p != NULL) { | |
2166 | parent = *p; | |
2167 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2168 | ||
2169 | if (set->cred < entry->cred) | |
2170 | p = &parent->rb_left; | |
2171 | else if (set->cred > entry->cred) | |
2172 | p = &parent->rb_right; | |
2173 | else | |
2174 | goto found; | |
2175 | } | |
2176 | rb_link_node(&set->rb_node, parent, p); | |
2177 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2178 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2179 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2180 | return; |
2181 | found: | |
2182 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2183 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2184 | list_del(&entry->lru); | |
1c3c07e9 TM |
2185 | spin_unlock(&inode->i_lock); |
2186 | nfs_access_free_entry(entry); | |
2187 | } | |
2188 | ||
6168f62c | 2189 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2190 | { |
2191 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2192 | if (cache == NULL) | |
2193 | return; | |
2194 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2195 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2196 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2197 | cache->mask = set->mask; |
1c3c07e9 TM |
2198 | |
2199 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2200 | |
2201 | /* Update accounting */ | |
2202 | smp_mb__before_atomic_inc(); | |
2203 | atomic_long_inc(&nfs_access_nr_entries); | |
2204 | smp_mb__after_atomic_inc(); | |
2205 | ||
2206 | /* Add inode to global LRU list */ | |
1a81bb8a | 2207 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2208 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2209 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2210 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2211 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2212 | spin_unlock(&nfs_access_lru_lock); |
2213 | } | |
1da177e4 | 2214 | } |
6168f62c WAA |
2215 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2216 | ||
2217 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2218 | { | |
2219 | entry->mask = 0; | |
2220 | if (access_result & NFS4_ACCESS_READ) | |
2221 | entry->mask |= MAY_READ; | |
2222 | if (access_result & | |
2223 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2224 | entry->mask |= MAY_WRITE; | |
2225 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2226 | entry->mask |= MAY_EXEC; | |
2227 | } | |
2228 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2229 | |
2230 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2231 | { | |
2232 | struct nfs_access_entry cache; | |
2233 | int status; | |
2234 | ||
f4ce1299 TM |
2235 | trace_nfs_access_enter(inode); |
2236 | ||
1da177e4 LT |
2237 | status = nfs_access_get_cached(inode, cred, &cache); |
2238 | if (status == 0) | |
f4ce1299 | 2239 | goto out_cached; |
1da177e4 LT |
2240 | |
2241 | /* Be clever: ask server to check for all possible rights */ | |
2242 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2243 | cache.cred = cred; | |
2244 | cache.jiffies = jiffies; | |
2245 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2246 | if (status != 0) { |
2247 | if (status == -ESTALE) { | |
2248 | nfs_zap_caches(inode); | |
2249 | if (!S_ISDIR(inode->i_mode)) | |
2250 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2251 | } | |
f4ce1299 | 2252 | goto out; |
a71ee337 | 2253 | } |
1da177e4 | 2254 | nfs_access_add_cache(inode, &cache); |
f4ce1299 TM |
2255 | out_cached: |
2256 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) | |
2257 | status = -EACCES; | |
1da177e4 | 2258 | out: |
f4ce1299 TM |
2259 | trace_nfs_access_exit(inode, status); |
2260 | return status; | |
1da177e4 LT |
2261 | } |
2262 | ||
af22f94a TM |
2263 | static int nfs_open_permission_mask(int openflags) |
2264 | { | |
2265 | int mask = 0; | |
2266 | ||
f8d9a897 WAA |
2267 | if (openflags & __FMODE_EXEC) { |
2268 | /* ONLY check exec rights */ | |
2269 | mask = MAY_EXEC; | |
2270 | } else { | |
2271 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2272 | mask |= MAY_READ; | |
2273 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2274 | mask |= MAY_WRITE; | |
2275 | } | |
2276 | ||
af22f94a TM |
2277 | return mask; |
2278 | } | |
2279 | ||
2280 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2281 | { | |
2282 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2283 | } | |
89d77c8f | 2284 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2285 | |
10556cb2 | 2286 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2287 | { |
2288 | struct rpc_cred *cred; | |
2289 | int res = 0; | |
2290 | ||
10556cb2 | 2291 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2292 | return -ECHILD; |
2293 | ||
91d5b470 CL |
2294 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2295 | ||
e6305c43 | 2296 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2297 | goto out; |
2298 | /* Is this sys_access() ? */ | |
9cfcac81 | 2299 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2300 | goto force_lookup; |
2301 | ||
2302 | switch (inode->i_mode & S_IFMT) { | |
2303 | case S_IFLNK: | |
2304 | goto out; | |
2305 | case S_IFREG: | |
1da177e4 LT |
2306 | break; |
2307 | case S_IFDIR: | |
2308 | /* | |
2309 | * Optimize away all write operations, since the server | |
2310 | * will check permissions when we perform the op. | |
2311 | */ | |
2312 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2313 | goto out; | |
2314 | } | |
2315 | ||
2316 | force_lookup: | |
1da177e4 LT |
2317 | if (!NFS_PROTO(inode)->access) |
2318 | goto out_notsup; | |
2319 | ||
98a8e323 | 2320 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2321 | if (!IS_ERR(cred)) { |
2322 | res = nfs_do_access(inode, cred, mask); | |
2323 | put_rpccred(cred); | |
2324 | } else | |
2325 | res = PTR_ERR(cred); | |
1da177e4 | 2326 | out: |
f696a365 MS |
2327 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2328 | res = -EACCES; | |
2329 | ||
1e7cb3dc CL |
2330 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2331 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2332 | return res; |
2333 | out_notsup: | |
2334 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2335 | if (res == 0) | |
2830ba7f | 2336 | res = generic_permission(inode, mask); |
1e7cb3dc | 2337 | goto out; |
1da177e4 | 2338 | } |
ddda8e0a | 2339 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2340 | |
2341 | /* | |
2342 | * Local variables: | |
2343 | * version-control: t | |
2344 | * kept-new-versions: 5 | |
2345 | * End: | |
2346 | */ |