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Commit | Line | Data |
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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 | 71 | { |
311324ad | 72 | struct nfs_inode *nfsi = NFS_I(dir); |
480c2006 BS |
73 | struct nfs_open_dir_context *ctx; |
74 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
75 | if (ctx != NULL) { | |
8ef2ce3e | 76 | ctx->duped = 0; |
311324ad | 77 | ctx->attr_gencount = nfsi->attr_gencount; |
480c2006 | 78 | ctx->dir_cookie = 0; |
8ef2ce3e | 79 | ctx->dup_cookie = 0; |
480c2006 | 80 | ctx->cred = get_rpccred(cred); |
311324ad TM |
81 | spin_lock(&dir->i_lock); |
82 | list_add(&ctx->list, &nfsi->open_files); | |
83 | spin_unlock(&dir->i_lock); | |
0c030806 TM |
84 | return ctx; |
85 | } | |
86 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
87 | } |
88 | ||
311324ad | 89 | static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) |
480c2006 | 90 | { |
311324ad TM |
91 | spin_lock(&dir->i_lock); |
92 | list_del(&ctx->list); | |
93 | spin_unlock(&dir->i_lock); | |
480c2006 BS |
94 | put_rpccred(ctx->cred); |
95 | kfree(ctx); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* |
99 | * Open file | |
100 | */ | |
101 | static int | |
102 | nfs_opendir(struct inode *inode, struct file *filp) | |
103 | { | |
480c2006 BS |
104 | int res = 0; |
105 | struct nfs_open_dir_context *ctx; | |
106 | struct rpc_cred *cred; | |
1da177e4 | 107 | |
6de1472f | 108 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
109 | |
110 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 111 | |
480c2006 BS |
112 | cred = rpc_lookup_cred(); |
113 | if (IS_ERR(cred)) | |
114 | return PTR_ERR(cred); | |
0c030806 | 115 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
116 | if (IS_ERR(ctx)) { |
117 | res = PTR_ERR(ctx); | |
118 | goto out; | |
119 | } | |
120 | filp->private_data = ctx; | |
f5a73672 NB |
121 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
122 | /* This is a mountpoint, so d_revalidate will never | |
123 | * have been called, so we need to refresh the | |
124 | * inode (for close-open consistency) ourselves. | |
125 | */ | |
126 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
127 | } | |
480c2006 BS |
128 | out: |
129 | put_rpccred(cred); | |
1da177e4 LT |
130 | return res; |
131 | } | |
132 | ||
480c2006 BS |
133 | static int |
134 | nfs_closedir(struct inode *inode, struct file *filp) | |
135 | { | |
a455589f | 136 | put_nfs_open_dir_context(file_inode(filp), filp->private_data); |
480c2006 BS |
137 | return 0; |
138 | } | |
139 | ||
d1bacf9e BS |
140 | struct nfs_cache_array_entry { |
141 | u64 cookie; | |
142 | u64 ino; | |
143 | struct qstr string; | |
0b26a0bf | 144 | unsigned char d_type; |
d1bacf9e BS |
145 | }; |
146 | ||
147 | struct nfs_cache_array { | |
88b8e133 | 148 | int size; |
d1bacf9e BS |
149 | int eof_index; |
150 | u64 last_cookie; | |
151 | struct nfs_cache_array_entry array[0]; | |
152 | }; | |
153 | ||
573c4e1e | 154 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
155 | typedef struct { |
156 | struct file *file; | |
157 | struct page *page; | |
23db8620 | 158 | struct dir_context *ctx; |
1da177e4 | 159 | unsigned long page_index; |
f0dd2136 | 160 | u64 *dir_cookie; |
0aded708 | 161 | u64 last_cookie; |
f0dd2136 | 162 | loff_t current_index; |
1da177e4 | 163 | decode_dirent_t decode; |
d1bacf9e | 164 | |
1f4eab7e | 165 | unsigned long timestamp; |
4704f0e2 | 166 | unsigned long gencount; |
d1bacf9e BS |
167 | unsigned int cache_entry_index; |
168 | unsigned int plus:1; | |
169 | unsigned int eof:1; | |
1da177e4 LT |
170 | } nfs_readdir_descriptor_t; |
171 | ||
d1bacf9e BS |
172 | /* |
173 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
174 | */ |
175 | static | |
d1bacf9e BS |
176 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
177 | { | |
8cd51a0c | 178 | void *ptr; |
d1bacf9e BS |
179 | if (page == NULL) |
180 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
181 | ptr = kmap(page); |
182 | if (ptr == NULL) | |
183 | return ERR_PTR(-ENOMEM); | |
184 | return ptr; | |
d1bacf9e BS |
185 | } |
186 | ||
187 | static | |
188 | void nfs_readdir_release_array(struct page *page) | |
189 | { | |
190 | kunmap(page); | |
191 | } | |
192 | ||
193 | /* | |
194 | * we are freeing strings created by nfs_add_to_readdir_array() | |
195 | */ | |
196 | static | |
11de3b11 | 197 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 198 | { |
11de3b11 | 199 | struct nfs_cache_array *array; |
d1bacf9e | 200 | int i; |
8cd51a0c | 201 | |
2b86ce2d | 202 | array = kmap_atomic(page); |
d1bacf9e BS |
203 | for (i = 0; i < array->size; i++) |
204 | kfree(array->array[i].string.name); | |
2b86ce2d | 205 | kunmap_atomic(array); |
d1bacf9e BS |
206 | } |
207 | ||
208 | /* | |
209 | * the caller is responsible for freeing qstr.name | |
210 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
211 | * nfs_clear_readdir_array() | |
212 | */ | |
213 | static | |
4a201d6e | 214 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
215 | { |
216 | string->len = len; | |
217 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
218 | if (string->name == NULL) |
219 | return -ENOMEM; | |
04e4bd1c CM |
220 | /* |
221 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
222 | * in a page cache page which kmemleak does not scan. | |
223 | */ | |
224 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
225 | string->hash = full_name_hash(name, len); |
226 | return 0; | |
d1bacf9e BS |
227 | } |
228 | ||
229 | static | |
230 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
231 | { | |
232 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
233 | struct nfs_cache_array_entry *cache_entry; |
234 | int ret; | |
235 | ||
d1bacf9e BS |
236 | if (IS_ERR(array)) |
237 | return PTR_ERR(array); | |
3020093f TM |
238 | |
239 | cache_entry = &array->array[array->size]; | |
240 | ||
241 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 242 | ret = -ENOSPC; |
3020093f | 243 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 244 | goto out; |
d1bacf9e | 245 | |
4a201d6e TM |
246 | cache_entry->cookie = entry->prev_cookie; |
247 | cache_entry->ino = entry->ino; | |
0b26a0bf | 248 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
249 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
250 | if (ret) | |
251 | goto out; | |
d1bacf9e | 252 | array->last_cookie = entry->cookie; |
8cd51a0c | 253 | array->size++; |
47c716cb | 254 | if (entry->eof != 0) |
d1bacf9e | 255 | array->eof_index = array->size; |
4a201d6e | 256 | out: |
d1bacf9e | 257 | nfs_readdir_release_array(page); |
4a201d6e | 258 | return ret; |
d1bacf9e BS |
259 | } |
260 | ||
261 | static | |
262 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
263 | { | |
23db8620 | 264 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
265 | unsigned int index; |
266 | ||
267 | if (diff < 0) | |
268 | goto out_eof; | |
269 | if (diff >= array->size) { | |
8cd51a0c | 270 | if (array->eof_index >= 0) |
d1bacf9e | 271 | goto out_eof; |
d1bacf9e BS |
272 | return -EAGAIN; |
273 | } | |
274 | ||
275 | index = (unsigned int)diff; | |
276 | *desc->dir_cookie = array->array[index].cookie; | |
277 | desc->cache_entry_index = index; | |
d1bacf9e BS |
278 | return 0; |
279 | out_eof: | |
280 | desc->eof = 1; | |
281 | return -EBADCOOKIE; | |
282 | } | |
283 | ||
4db72b40 JL |
284 | static bool |
285 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
286 | { | |
287 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
288 | return false; | |
289 | smp_rmb(); | |
290 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
291 | } | |
292 | ||
d1bacf9e BS |
293 | static |
294 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
295 | { | |
296 | int i; | |
8ef2ce3e | 297 | loff_t new_pos; |
d1bacf9e BS |
298 | int status = -EAGAIN; |
299 | ||
300 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 301 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 302 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
303 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
304 | ||
8ef2ce3e | 305 | new_pos = desc->current_index + i; |
4db72b40 JL |
306 | if (ctx->attr_gencount != nfsi->attr_gencount || |
307 | !nfs_readdir_inode_mapping_valid(nfsi)) { | |
0c030806 TM |
308 | ctx->duped = 0; |
309 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 310 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
311 | if (ctx->duped > 0 |
312 | && ctx->dup_cookie == *desc->dir_cookie) { | |
313 | if (printk_ratelimit()) { | |
6de1472f | 314 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 315 | "Please contact your server vendor. " |
9581a4ae JL |
316 | "The file: %.*s has duplicate cookie %llu\n", |
317 | desc->file, array->array[i].string.len, | |
318 | array->array[i].string.name, *desc->dir_cookie); | |
0c030806 TM |
319 | } |
320 | status = -ELOOP; | |
321 | goto out; | |
322 | } | |
8ef2ce3e | 323 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 324 | ctx->duped = -1; |
8ef2ce3e | 325 | } |
23db8620 | 326 | desc->ctx->pos = new_pos; |
d1bacf9e | 327 | desc->cache_entry_index = i; |
47c716cb | 328 | return 0; |
d1bacf9e BS |
329 | } |
330 | } | |
47c716cb | 331 | if (array->eof_index >= 0) { |
8cd51a0c | 332 | status = -EBADCOOKIE; |
18fb5fe4 TM |
333 | if (*desc->dir_cookie == array->last_cookie) |
334 | desc->eof = 1; | |
8cd51a0c | 335 | } |
0c030806 | 336 | out: |
d1bacf9e BS |
337 | return status; |
338 | } | |
339 | ||
340 | static | |
341 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
342 | { | |
343 | struct nfs_cache_array *array; | |
47c716cb | 344 | int status; |
d1bacf9e BS |
345 | |
346 | array = nfs_readdir_get_array(desc->page); | |
347 | if (IS_ERR(array)) { | |
348 | status = PTR_ERR(array); | |
349 | goto out; | |
350 | } | |
351 | ||
352 | if (*desc->dir_cookie == 0) | |
353 | status = nfs_readdir_search_for_pos(array, desc); | |
354 | else | |
355 | status = nfs_readdir_search_for_cookie(array, desc); | |
356 | ||
47c716cb | 357 | if (status == -EAGAIN) { |
0aded708 | 358 | desc->last_cookie = array->last_cookie; |
e47c085a | 359 | desc->current_index += array->size; |
47c716cb TM |
360 | desc->page_index++; |
361 | } | |
d1bacf9e BS |
362 | nfs_readdir_release_array(desc->page); |
363 | out: | |
364 | return status; | |
365 | } | |
366 | ||
367 | /* Fill a page with xdr information before transferring to the cache page */ | |
368 | static | |
56e4ebf8 | 369 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 370 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 371 | { |
480c2006 BS |
372 | struct nfs_open_dir_context *ctx = file->private_data; |
373 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 374 | unsigned long timestamp, gencount; |
1da177e4 LT |
375 | int error; |
376 | ||
1da177e4 LT |
377 | again: |
378 | timestamp = jiffies; | |
4704f0e2 | 379 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 380 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
381 | NFS_SERVER(inode)->dtsize, desc->plus); |
382 | if (error < 0) { | |
383 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
384 | if (error == -ENOTSUPP && desc->plus) { | |
385 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 386 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
387 | desc->plus = 0; |
388 | goto again; | |
389 | } | |
390 | goto error; | |
391 | } | |
1f4eab7e | 392 | desc->timestamp = timestamp; |
4704f0e2 | 393 | desc->gencount = gencount; |
d1bacf9e BS |
394 | error: |
395 | return error; | |
1da177e4 LT |
396 | } |
397 | ||
573c4e1e CL |
398 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
399 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 400 | { |
573c4e1e | 401 | int error; |
1da177e4 | 402 | |
573c4e1e CL |
403 | error = desc->decode(xdr, entry, desc->plus); |
404 | if (error) | |
405 | return error; | |
d1bacf9e BS |
406 | entry->fattr->time_start = desc->timestamp; |
407 | entry->fattr->gencount = desc->gencount; | |
408 | return 0; | |
1da177e4 LT |
409 | } |
410 | ||
d39ab9de BS |
411 | static |
412 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
413 | { | |
d39ab9de BS |
414 | if (dentry->d_inode == NULL) |
415 | goto different; | |
37a09f07 | 416 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
417 | goto different; |
418 | return 1; | |
419 | different: | |
420 | return 0; | |
421 | } | |
422 | ||
d69ee9b8 | 423 | static |
23db8620 | 424 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
425 | { |
426 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
427 | return false; | |
428 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
429 | return true; | |
23db8620 | 430 | if (ctx->pos == 0) |
d69ee9b8 TM |
431 | return true; |
432 | return false; | |
433 | } | |
434 | ||
435 | /* | |
436 | * This function is called by the lookup code to request the use of | |
437 | * readdirplus to accelerate any future lookups in the same | |
438 | * directory. | |
439 | */ | |
440 | static | |
441 | void nfs_advise_use_readdirplus(struct inode *dir) | |
442 | { | |
443 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
444 | } | |
445 | ||
311324ad TM |
446 | /* |
447 | * This function is mainly for use by nfs_getattr(). | |
448 | * | |
449 | * If this is an 'ls -l', we want to force use of readdirplus. | |
450 | * Do this by checking if there is an active file descriptor | |
451 | * and calling nfs_advise_use_readdirplus, then forcing a | |
452 | * cache flush. | |
453 | */ | |
454 | void nfs_force_use_readdirplus(struct inode *dir) | |
455 | { | |
456 | if (!list_empty(&NFS_I(dir)->open_files)) { | |
457 | nfs_advise_use_readdirplus(dir); | |
458 | nfs_zap_mapping(dir, dir->i_mapping); | |
459 | } | |
460 | } | |
461 | ||
d39ab9de BS |
462 | static |
463 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
464 | { | |
26fe5750 | 465 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
466 | struct dentry *dentry; |
467 | struct dentry *alias; | |
d39ab9de BS |
468 | struct inode *dir = parent->d_inode; |
469 | struct inode *inode; | |
aa9c2669 | 470 | int status; |
d39ab9de | 471 | |
6c441c25 TM |
472 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
473 | return; | |
4a201d6e TM |
474 | if (filename.name[0] == '.') { |
475 | if (filename.len == 1) | |
476 | return; | |
477 | if (filename.len == 2 && filename.name[1] == '.') | |
478 | return; | |
479 | } | |
480 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 481 | |
4a201d6e | 482 | dentry = d_lookup(parent, &filename); |
d39ab9de | 483 | if (dentry != NULL) { |
6c441c25 TM |
484 | /* Is there a mountpoint here? If so, just exit */ |
485 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
486 | &entry->fattr->fsid)) | |
487 | goto out; | |
d39ab9de | 488 | if (nfs_same_file(dentry, entry)) { |
cda57a1e | 489 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
aa9c2669 DQ |
490 | status = nfs_refresh_inode(dentry->d_inode, entry->fattr); |
491 | if (!status) | |
492 | nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label); | |
d39ab9de BS |
493 | goto out; |
494 | } else { | |
5542aa2f | 495 | d_invalidate(dentry); |
d39ab9de BS |
496 | dput(dentry); |
497 | } | |
498 | } | |
499 | ||
500 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
501 | if (dentry == NULL) |
502 | return; | |
503 | ||
1775fd3e | 504 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
d39ab9de BS |
505 | if (IS_ERR(inode)) |
506 | goto out; | |
507 | ||
41d28bca | 508 | alias = d_splice_alias(inode, dentry); |
d39ab9de BS |
509 | if (IS_ERR(alias)) |
510 | goto out; | |
511 | else if (alias) { | |
512 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
513 | dput(alias); | |
514 | } else | |
515 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
516 | ||
517 | out: | |
518 | dput(dentry); | |
d39ab9de BS |
519 | } |
520 | ||
d1bacf9e BS |
521 | /* Perform conversion from xdr to cache array */ |
522 | static | |
8cd51a0c | 523 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 524 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 525 | { |
babddc72 | 526 | struct xdr_stream stream; |
f7da7a12 | 527 | struct xdr_buf buf; |
6650239a | 528 | struct page *scratch; |
99424380 | 529 | struct nfs_cache_array *array; |
5c346854 TM |
530 | unsigned int count = 0; |
531 | int status; | |
babddc72 | 532 | |
6650239a TM |
533 | scratch = alloc_page(GFP_KERNEL); |
534 | if (scratch == NULL) | |
535 | return -ENOMEM; | |
babddc72 | 536 | |
f7da7a12 | 537 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 538 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
539 | |
540 | do { | |
541 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
542 | if (status != 0) { |
543 | if (status == -EAGAIN) | |
544 | status = 0; | |
99424380 | 545 | break; |
8cd51a0c | 546 | } |
99424380 | 547 | |
5c346854 TM |
548 | count++; |
549 | ||
47c716cb | 550 | if (desc->plus != 0) |
d39ab9de | 551 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
552 | |
553 | status = nfs_readdir_add_to_array(entry, page); | |
554 | if (status != 0) | |
555 | break; | |
99424380 BS |
556 | } while (!entry->eof); |
557 | ||
47c716cb | 558 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 559 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
560 | if (!IS_ERR(array)) { |
561 | array->eof_index = array->size; | |
562 | status = 0; | |
563 | nfs_readdir_release_array(page); | |
5c346854 TM |
564 | } else |
565 | status = PTR_ERR(array); | |
1da177e4 | 566 | } |
6650239a TM |
567 | |
568 | put_page(scratch); | |
8cd51a0c | 569 | return status; |
56e4ebf8 BS |
570 | } |
571 | ||
572 | static | |
573 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
574 | { | |
575 | unsigned int i; | |
576 | for (i = 0; i < npages; i++) | |
577 | put_page(pages[i]); | |
578 | } | |
579 | ||
580 | static | |
581 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
582 | unsigned int npages) | |
583 | { | |
56e4ebf8 BS |
584 | nfs_readdir_free_pagearray(pages, npages); |
585 | } | |
586 | ||
587 | /* | |
588 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
589 | * to nfs_readdir_free_large_page | |
590 | */ | |
591 | static | |
6650239a | 592 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 593 | { |
56e4ebf8 BS |
594 | unsigned int i; |
595 | ||
596 | for (i = 0; i < npages; i++) { | |
597 | struct page *page = alloc_page(GFP_KERNEL); | |
598 | if (page == NULL) | |
599 | goto out_freepages; | |
600 | pages[i] = page; | |
601 | } | |
6650239a | 602 | return 0; |
56e4ebf8 | 603 | |
56e4ebf8 BS |
604 | out_freepages: |
605 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 606 | return -ENOMEM; |
1da177e4 LT |
607 | } |
608 | ||
d1bacf9e BS |
609 | static |
610 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 611 | { |
56e4ebf8 BS |
612 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
613 | void *pages_ptr = NULL; | |
d1bacf9e BS |
614 | struct nfs_entry entry; |
615 | struct file *file = desc->file; | |
616 | struct nfs_cache_array *array; | |
8cd51a0c | 617 | int status = -ENOMEM; |
56e4ebf8 | 618 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
619 | |
620 | entry.prev_cookie = 0; | |
0aded708 | 621 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
622 | entry.eof = 0; |
623 | entry.fh = nfs_alloc_fhandle(); | |
624 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 625 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
626 | if (entry.fh == NULL || entry.fattr == NULL) |
627 | goto out; | |
00a92642 | 628 | |
14c43f76 DQ |
629 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
630 | if (IS_ERR(entry.label)) { | |
631 | status = PTR_ERR(entry.label); | |
632 | goto out; | |
633 | } | |
634 | ||
d1bacf9e | 635 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
636 | if (IS_ERR(array)) { |
637 | status = PTR_ERR(array); | |
14c43f76 | 638 | goto out_label_free; |
8cd51a0c | 639 | } |
d1bacf9e BS |
640 | memset(array, 0, sizeof(struct nfs_cache_array)); |
641 | array->eof_index = -1; | |
00a92642 | 642 | |
6650239a TM |
643 | status = nfs_readdir_large_page(pages, array_size); |
644 | if (status < 0) | |
d1bacf9e BS |
645 | goto out_release_array; |
646 | do { | |
ac396128 | 647 | unsigned int pglen; |
56e4ebf8 | 648 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 649 | |
d1bacf9e | 650 | if (status < 0) |
00a92642 | 651 | break; |
ac396128 | 652 | pglen = status; |
6650239a | 653 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
654 | if (status < 0) { |
655 | if (status == -ENOSPC) | |
656 | status = 0; | |
657 | break; | |
658 | } | |
659 | } while (array->eof_index < 0); | |
d1bacf9e | 660 | |
56e4ebf8 | 661 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
662 | out_release_array: |
663 | nfs_readdir_release_array(page); | |
14c43f76 DQ |
664 | out_label_free: |
665 | nfs4_label_free(entry.label); | |
d1bacf9e BS |
666 | out: |
667 | nfs_free_fattr(entry.fattr); | |
668 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
669 | return status; |
670 | } | |
671 | ||
672 | /* | |
d1bacf9e BS |
673 | * Now we cache directories properly, by converting xdr information |
674 | * to an array that can be used for lookups later. This results in | |
675 | * fewer cache pages, since we can store more information on each page. | |
676 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 677 | */ |
d1bacf9e BS |
678 | static |
679 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 680 | { |
496ad9aa | 681 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 682 | int ret; |
1da177e4 | 683 | |
8cd51a0c TM |
684 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
685 | if (ret < 0) | |
d1bacf9e BS |
686 | goto error; |
687 | SetPageUptodate(page); | |
1da177e4 | 688 | |
d1bacf9e BS |
689 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
690 | /* Should never happen */ | |
691 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 692 | } |
d1bacf9e BS |
693 | unlock_page(page); |
694 | return 0; | |
695 | error: | |
696 | unlock_page(page); | |
8cd51a0c | 697 | return ret; |
d1bacf9e | 698 | } |
1da177e4 | 699 | |
d1bacf9e BS |
700 | static |
701 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
702 | { | |
11de3b11 TM |
703 | if (!desc->page->mapping) |
704 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
705 | page_cache_release(desc->page); |
706 | desc->page = NULL; | |
707 | } | |
708 | ||
709 | static | |
710 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
711 | { | |
496ad9aa | 712 | return read_cache_page(file_inode(desc->file)->i_mapping, |
d1bacf9e | 713 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
714 | } |
715 | ||
716 | /* | |
d1bacf9e | 717 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 718 | */ |
d1bacf9e BS |
719 | static |
720 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
721 | { | |
722 | int res; | |
723 | ||
724 | desc->page = get_cache_page(desc); | |
725 | if (IS_ERR(desc->page)) | |
726 | return PTR_ERR(desc->page); | |
727 | ||
728 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
729 | if (res != 0) |
730 | cache_page_release(desc); | |
d1bacf9e BS |
731 | return res; |
732 | } | |
733 | ||
734 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
735 | static inline |
736 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
737 | { | |
8cd51a0c | 738 | int res; |
d1bacf9e | 739 | |
0aded708 | 740 | if (desc->page_index == 0) { |
8cd51a0c | 741 | desc->current_index = 0; |
0aded708 TM |
742 | desc->last_cookie = 0; |
743 | } | |
47c716cb | 744 | do { |
d1bacf9e | 745 | res = find_cache_page(desc); |
47c716cb | 746 | } while (res == -EAGAIN); |
1da177e4 LT |
747 | return res; |
748 | } | |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Once we've found the start of the dirent within a page: fill 'er up... | |
752 | */ | |
753 | static | |
23db8620 | 754 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
755 | { |
756 | struct file *file = desc->file; | |
d1bacf9e BS |
757 | int i = 0; |
758 | int res = 0; | |
759 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
760 | struct nfs_open_dir_context *ctx = file->private_data; |
761 | ||
d1bacf9e | 762 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
763 | if (IS_ERR(array)) { |
764 | res = PTR_ERR(array); | |
765 | goto out; | |
766 | } | |
d1bacf9e BS |
767 | |
768 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 769 | struct nfs_cache_array_entry *ent; |
1da177e4 | 770 | |
ece0b423 | 771 | ent = &array->array[i]; |
23db8620 AV |
772 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
773 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 774 | desc->eof = 1; |
1da177e4 | 775 | break; |
ece0b423 | 776 | } |
23db8620 | 777 | desc->ctx->pos++; |
d1bacf9e BS |
778 | if (i < (array->size-1)) |
779 | *desc->dir_cookie = array->array[i+1].cookie; | |
780 | else | |
781 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
782 | if (ctx->duped != 0) |
783 | ctx->duped = 1; | |
1da177e4 | 784 | } |
47c716cb | 785 | if (array->eof_index >= 0) |
8cd51a0c | 786 | desc->eof = 1; |
d1bacf9e BS |
787 | |
788 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 789 | out: |
d1bacf9e | 790 | cache_page_release(desc); |
1e7cb3dc CL |
791 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
792 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
793 | return res; |
794 | } | |
795 | ||
796 | /* | |
797 | * If we cannot find a cookie in our cache, we suspect that this is | |
798 | * because it points to a deleted file, so we ask the server to return | |
799 | * whatever it thinks is the next entry. We then feed this to filldir. | |
800 | * If all goes well, we should then be able to find our way round the | |
801 | * cache on the next call to readdir_search_pagecache(); | |
802 | * | |
803 | * NOTE: we cannot add the anonymous page to the pagecache because | |
804 | * the data it contains might not be page aligned. Besides, | |
805 | * we should already have a complete representation of the | |
806 | * directory in the page cache by the time we get here. | |
807 | */ | |
808 | static inline | |
23db8620 | 809 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 810 | { |
1da177e4 LT |
811 | struct page *page = NULL; |
812 | int status; | |
496ad9aa | 813 | struct inode *inode = file_inode(desc->file); |
0c030806 | 814 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 815 | |
1e7cb3dc CL |
816 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
817 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
818 | |
819 | page = alloc_page(GFP_HIGHUSER); | |
820 | if (!page) { | |
821 | status = -ENOMEM; | |
822 | goto out; | |
823 | } | |
d1bacf9e | 824 | |
7a8e1dc3 | 825 | desc->page_index = 0; |
0aded708 | 826 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 827 | desc->page = page; |
0c030806 | 828 | ctx->duped = 0; |
7a8e1dc3 | 829 | |
85f8607e TM |
830 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
831 | if (status < 0) | |
1da177e4 LT |
832 | goto out_release; |
833 | ||
23db8620 | 834 | status = nfs_do_filldir(desc); |
1da177e4 | 835 | |
1da177e4 | 836 | out: |
1e7cb3dc | 837 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 838 | __func__, status); |
1da177e4 LT |
839 | return status; |
840 | out_release: | |
d1bacf9e | 841 | cache_page_release(desc); |
1da177e4 LT |
842 | goto out; |
843 | } | |
844 | ||
311324ad TM |
845 | static bool nfs_dir_mapping_need_revalidate(struct inode *dir) |
846 | { | |
847 | struct nfs_inode *nfsi = NFS_I(dir); | |
848 | ||
849 | if (nfs_attribute_cache_expired(dir)) | |
850 | return true; | |
851 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) | |
852 | return true; | |
853 | return false; | |
854 | } | |
855 | ||
00a92642 OG |
856 | /* The file offset position represents the dirent entry number. A |
857 | last cookie cache takes care of the common case of reading the | |
858 | whole directory. | |
1da177e4 | 859 | */ |
23db8620 | 860 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 861 | { |
23db8620 | 862 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
863 | struct inode *inode = dentry->d_inode; |
864 | nfs_readdir_descriptor_t my_desc, | |
865 | *desc = &my_desc; | |
23db8620 | 866 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 867 | int res = 0; |
1da177e4 | 868 | |
6de1472f AV |
869 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
870 | file, (long long)ctx->pos); | |
91d5b470 CL |
871 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
872 | ||
1da177e4 | 873 | /* |
23db8620 | 874 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 875 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
876 | * to either find the entry with the appropriate number or |
877 | * revalidate the cookie. | |
1da177e4 LT |
878 | */ |
879 | memset(desc, 0, sizeof(*desc)); | |
880 | ||
23db8620 AV |
881 | desc->file = file; |
882 | desc->ctx = ctx; | |
480c2006 | 883 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 884 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 885 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 886 | |
565277f6 | 887 | nfs_block_sillyrename(dentry); |
311324ad | 888 | if (ctx->pos == 0 || nfs_dir_mapping_need_revalidate(inode)) |
07b5ce8e | 889 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
fccca7fc TM |
890 | if (res < 0) |
891 | goto out; | |
892 | ||
47c716cb | 893 | do { |
1da177e4 | 894 | res = readdir_search_pagecache(desc); |
00a92642 | 895 | |
1da177e4 | 896 | if (res == -EBADCOOKIE) { |
ece0b423 | 897 | res = 0; |
1da177e4 | 898 | /* This means either end of directory */ |
d1bacf9e | 899 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 900 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 901 | res = uncached_readdir(desc); |
ece0b423 | 902 | if (res == 0) |
1da177e4 LT |
903 | continue; |
904 | } | |
1da177e4 LT |
905 | break; |
906 | } | |
907 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 908 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 909 | nfs_zap_caches(inode); |
baf57a09 | 910 | desc->page_index = 0; |
1da177e4 | 911 | desc->plus = 0; |
d1bacf9e | 912 | desc->eof = 0; |
1da177e4 LT |
913 | continue; |
914 | } | |
915 | if (res < 0) | |
916 | break; | |
917 | ||
23db8620 | 918 | res = nfs_do_filldir(desc); |
ece0b423 | 919 | if (res < 0) |
1da177e4 | 920 | break; |
47c716cb | 921 | } while (!desc->eof); |
fccca7fc | 922 | out: |
565277f6 | 923 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
924 | if (res > 0) |
925 | res = 0; | |
6de1472f | 926 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 927 | return res; |
1da177e4 LT |
928 | } |
929 | ||
965c8e59 | 930 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 931 | { |
6de1472f | 932 | struct inode *inode = file_inode(filp); |
480c2006 | 933 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 934 | |
6de1472f AV |
935 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
936 | filp, offset, whence); | |
b84e06c5 CL |
937 | |
938 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 939 | switch (whence) { |
f0dd2136 TM |
940 | case 1: |
941 | offset += filp->f_pos; | |
942 | case 0: | |
943 | if (offset >= 0) | |
944 | break; | |
945 | default: | |
946 | offset = -EINVAL; | |
947 | goto out; | |
948 | } | |
949 | if (offset != filp->f_pos) { | |
950 | filp->f_pos = offset; | |
480c2006 | 951 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 952 | dir_ctx->duped = 0; |
f0dd2136 TM |
953 | } |
954 | out: | |
b84e06c5 | 955 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
956 | return offset; |
957 | } | |
958 | ||
1da177e4 LT |
959 | /* |
960 | * All directory operations under NFS are synchronous, so fsync() | |
961 | * is a dummy operation. | |
962 | */ | |
02c24a82 JB |
963 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
964 | int datasync) | |
1da177e4 | 965 | { |
6de1472f | 966 | struct inode *inode = file_inode(filp); |
7ea80859 | 967 | |
6de1472f | 968 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 969 | |
02c24a82 | 970 | mutex_lock(&inode->i_mutex); |
6de1472f | 971 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
02c24a82 | 972 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
973 | return 0; |
974 | } | |
975 | ||
bfc69a45 TM |
976 | /** |
977 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
978 | * @dir - pointer to directory inode | |
979 | * | |
980 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
981 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
982 | * on the server that might have invalidated our dcache. | |
983 | * | |
984 | * The caller should be holding dir->i_lock | |
985 | */ | |
986 | void nfs_force_lookup_revalidate(struct inode *dir) | |
987 | { | |
011935a0 | 988 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 989 | } |
89d77c8f | 990 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 991 | |
1da177e4 LT |
992 | /* |
993 | * A check for whether or not the parent directory has changed. | |
994 | * In the case it has, we assume that the dentries are untrustworthy | |
995 | * and may need to be looked up again. | |
912a108d | 996 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 997 | */ |
912a108d N |
998 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
999 | int rcu_walk) | |
1da177e4 | 1000 | { |
912a108d N |
1001 | int ret; |
1002 | ||
1da177e4 LT |
1003 | if (IS_ROOT(dentry)) |
1004 | return 1; | |
4eec952e TM |
1005 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1006 | return 0; | |
f2c77f4e TM |
1007 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1008 | return 0; | |
1009 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
912a108d N |
1010 | if (rcu_walk) |
1011 | ret = nfs_revalidate_inode_rcu(NFS_SERVER(dir), dir); | |
1012 | else | |
1013 | ret = nfs_revalidate_inode(NFS_SERVER(dir), dir); | |
1014 | if (ret < 0) | |
f2c77f4e TM |
1015 | return 0; |
1016 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
1017 | return 0; | |
1018 | return 1; | |
1da177e4 LT |
1019 | } |
1020 | ||
a12802ca TM |
1021 | /* |
1022 | * Use intent information to check whether or not we're going to do | |
1023 | * an O_EXCL create using this path component. | |
1024 | */ | |
fa3c56bb | 1025 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1026 | { |
1027 | if (NFS_PROTO(dir)->version == 2) | |
1028 | return 0; | |
fa3c56bb | 1029 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1030 | } |
1031 | ||
1d6757fb TM |
1032 | /* |
1033 | * Inode and filehandle revalidation for lookups. | |
1034 | * | |
1035 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1036 | * or if the intent information indicates that we're about to open this | |
1037 | * particular file and the "nocto" mount flag is not set. | |
1038 | * | |
1039 | */ | |
65a0c149 | 1040 | static |
fa3c56bb | 1041 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1042 | { |
1043 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1044 | int ret; |
1da177e4 | 1045 | |
36d43a43 | 1046 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1047 | return 0; |
facc3530 | 1048 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1049 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1050 | goto out_force; |
1051 | /* This is an open(2) */ | |
fa3c56bb AV |
1052 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1053 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1054 | goto out_force; |
65a0c149 TM |
1055 | out: |
1056 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1057 | out_force: |
1fa1e384 N |
1058 | if (flags & LOOKUP_RCU) |
1059 | return -ECHILD; | |
65a0c149 TM |
1060 | ret = __nfs_revalidate_inode(server, inode); |
1061 | if (ret != 0) | |
1062 | return ret; | |
1063 | goto out; | |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * We judge how long we want to trust negative | |
1068 | * dentries by looking at the parent inode mtime. | |
1069 | * | |
1070 | * If parent mtime has changed, we revalidate, else we wait for a | |
1071 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1072 | * |
1073 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1074 | * suggesting a reval is needed. | |
1da177e4 LT |
1075 | */ |
1076 | static inline | |
1077 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1078 | unsigned int flags) |
1da177e4 | 1079 | { |
1da177e4 | 1080 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1081 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1082 | return 0; |
4eec952e TM |
1083 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1084 | return 1; | |
912a108d | 1085 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | /* | |
1089 | * This is called every time the dcache has a lookup hit, | |
1090 | * and we should check whether we can really trust that | |
1091 | * lookup. | |
1092 | * | |
1093 | * NOTE! The hit can be a negative hit too, don't assume | |
1094 | * we have an inode! | |
1095 | * | |
1096 | * If the parent directory is seen to have changed, we throw out the | |
1097 | * cached dentry and do a new lookup. | |
1098 | */ | |
0b728e19 | 1099 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1100 | { |
1101 | struct inode *dir; | |
1102 | struct inode *inode; | |
1103 | struct dentry *parent; | |
e1fb4d05 TM |
1104 | struct nfs_fh *fhandle = NULL; |
1105 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1106 | struct nfs4_label *label = NULL; |
1da177e4 | 1107 | int error; |
1da177e4 | 1108 | |
d51ac1a8 | 1109 | if (flags & LOOKUP_RCU) { |
50d77739 | 1110 | parent = ACCESS_ONCE(dentry->d_parent); |
d51ac1a8 N |
1111 | dir = ACCESS_ONCE(parent->d_inode); |
1112 | if (!dir) | |
1113 | return -ECHILD; | |
1114 | } else { | |
1115 | parent = dget_parent(dentry); | |
1116 | dir = parent->d_inode; | |
1117 | } | |
91d5b470 | 1118 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1119 | inode = dentry->d_inode; |
1120 | ||
1121 | if (!inode) { | |
912a108d N |
1122 | if (nfs_neg_need_reval(dir, dentry, flags)) { |
1123 | if (flags & LOOKUP_RCU) | |
1124 | return -ECHILD; | |
1da177e4 | 1125 | goto out_bad; |
912a108d | 1126 | } |
d69ee9b8 | 1127 | goto out_valid_noent; |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | if (is_bad_inode(inode)) { | |
d51ac1a8 N |
1131 | if (flags & LOOKUP_RCU) |
1132 | return -ECHILD; | |
6de1472f AV |
1133 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1134 | __func__, dentry); | |
1da177e4 LT |
1135 | goto out_bad; |
1136 | } | |
1137 | ||
011e2a7f | 1138 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1139 | goto out_set_verifier; |
1140 | ||
1da177e4 | 1141 | /* Force a full look up iff the parent directory has changed */ |
912a108d N |
1142 | if (!nfs_is_exclusive_create(dir, flags) && |
1143 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { | |
1144 | ||
1fa1e384 N |
1145 | if (nfs_lookup_verify_inode(inode, flags)) { |
1146 | if (flags & LOOKUP_RCU) | |
1147 | return -ECHILD; | |
1da177e4 | 1148 | goto out_zap_parent; |
1fa1e384 | 1149 | } |
1da177e4 LT |
1150 | goto out_valid; |
1151 | } | |
1152 | ||
912a108d N |
1153 | if (flags & LOOKUP_RCU) |
1154 | return -ECHILD; | |
1155 | ||
1da177e4 LT |
1156 | if (NFS_STALE(inode)) |
1157 | goto out_bad; | |
1158 | ||
e1fb4d05 TM |
1159 | error = -ENOMEM; |
1160 | fhandle = nfs_alloc_fhandle(); | |
1161 | fattr = nfs_alloc_fattr(); | |
1162 | if (fhandle == NULL || fattr == NULL) | |
1163 | goto out_error; | |
1164 | ||
14c43f76 DQ |
1165 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1166 | if (IS_ERR(label)) | |
1167 | goto out_error; | |
1168 | ||
6e0d0be7 | 1169 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
1775fd3e | 1170 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
6e0d0be7 | 1171 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
1da177e4 LT |
1172 | if (error) |
1173 | goto out_bad; | |
e1fb4d05 | 1174 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1175 | goto out_bad; |
e1fb4d05 | 1176 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1177 | goto out_bad; |
1178 | ||
aa9c2669 DQ |
1179 | nfs_setsecurity(inode, fattr, label); |
1180 | ||
e1fb4d05 TM |
1181 | nfs_free_fattr(fattr); |
1182 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1183 | nfs4_label_free(label); |
1184 | ||
15860ab1 | 1185 | out_set_verifier: |
cf8ba45e | 1186 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1187 | out_valid: |
d69ee9b8 TM |
1188 | /* Success: notify readdir to use READDIRPLUS */ |
1189 | nfs_advise_use_readdirplus(dir); | |
1190 | out_valid_noent: | |
d51ac1a8 | 1191 | if (flags & LOOKUP_RCU) { |
50d77739 | 1192 | if (parent != ACCESS_ONCE(dentry->d_parent)) |
d51ac1a8 N |
1193 | return -ECHILD; |
1194 | } else | |
1195 | dput(parent); | |
6de1472f AV |
1196 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", |
1197 | __func__, dentry); | |
1da177e4 LT |
1198 | return 1; |
1199 | out_zap_parent: | |
1200 | nfs_zap_caches(dir); | |
1201 | out_bad: | |
d51ac1a8 | 1202 | WARN_ON(flags & LOOKUP_RCU); |
c44600c9 AV |
1203 | nfs_free_fattr(fattr); |
1204 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1205 | nfs4_label_free(label); |
a1643a92 | 1206 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1207 | if (inode && S_ISDIR(inode->i_mode)) { |
1208 | /* Purge readdir caches. */ | |
1209 | nfs_zap_caches(inode); | |
a3f432bf BF |
1210 | /* |
1211 | * We can't d_drop the root of a disconnected tree: | |
1212 | * its d_hash is on the s_anon list and d_drop() would hide | |
1213 | * it from shrink_dcache_for_unmount(), leading to busy | |
1214 | * inodes on unmount and further oopses. | |
1215 | */ | |
1216 | if (IS_ROOT(dentry)) | |
d9e80b7d | 1217 | goto out_valid; |
1da177e4 | 1218 | } |
1da177e4 | 1219 | dput(parent); |
6de1472f AV |
1220 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", |
1221 | __func__, dentry); | |
1da177e4 | 1222 | return 0; |
e1fb4d05 | 1223 | out_error: |
d51ac1a8 | 1224 | WARN_ON(flags & LOOKUP_RCU); |
e1fb4d05 TM |
1225 | nfs_free_fattr(fattr); |
1226 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1227 | nfs4_label_free(label); |
e1fb4d05 | 1228 | dput(parent); |
6de1472f AV |
1229 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", |
1230 | __func__, dentry, error); | |
e1fb4d05 | 1231 | return error; |
1da177e4 LT |
1232 | } |
1233 | ||
ecf3d1f1 JL |
1234 | /* |
1235 | * A weaker form of d_revalidate for revalidating just the dentry->d_inode | |
1236 | * when we don't really care about the dentry name. This is called when a | |
1237 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1238 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1239 | * | |
1240 | * In this situation, we just want to verify that the inode itself is OK | |
1241 | * since the dentry might have changed on the server. | |
1242 | */ | |
1243 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1244 | { | |
1245 | int error; | |
1246 | struct inode *inode = dentry->d_inode; | |
1247 | ||
1248 | /* | |
1249 | * I believe we can only get a negative dentry here in the case of a | |
1250 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1251 | * eventually need to do something more here. | |
1252 | */ | |
1253 | if (!inode) { | |
6de1472f AV |
1254 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1255 | __func__, dentry); | |
ecf3d1f1 JL |
1256 | return 1; |
1257 | } | |
1258 | ||
1259 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1260 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1261 | __func__, dentry); | |
ecf3d1f1 JL |
1262 | return 0; |
1263 | } | |
1264 | ||
1265 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1266 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1267 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1268 | return !error; | |
1269 | } | |
1270 | ||
1da177e4 LT |
1271 | /* |
1272 | * This is called from dput() when d_count is going to 0. | |
1273 | */ | |
fe15ce44 | 1274 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1275 | { |
6de1472f AV |
1276 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1277 | dentry, dentry->d_flags); | |
1da177e4 | 1278 | |
77f11192 TM |
1279 | /* Unhash any dentry with a stale inode */ |
1280 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1281 | return 1; | |
1282 | ||
1da177e4 LT |
1283 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1284 | /* Unhash it, so that ->d_iput() would be called */ | |
1285 | return 1; | |
1286 | } | |
1287 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1288 | /* Unhash it, so that ancestors of killed async unlink | |
1289 | * files will be cleaned up during umount */ | |
1290 | return 1; | |
1291 | } | |
1292 | return 0; | |
1293 | ||
1294 | } | |
1295 | ||
1f018458 | 1296 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1297 | static void nfs_drop_nlink(struct inode *inode) |
1298 | { | |
1299 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1300 | /* drop the inode if we're reasonably sure this is the last link */ |
1301 | if (inode->i_nlink == 1) | |
1302 | clear_nlink(inode); | |
1303 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1304 | spin_unlock(&inode->i_lock); |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /* |
1308 | * Called when the dentry loses inode. | |
1309 | * We use it to clean up silly-renamed files. | |
1310 | */ | |
1311 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1312 | { | |
83672d39 NB |
1313 | if (S_ISDIR(inode->i_mode)) |
1314 | /* drop any readdir cache as it could easily be old */ | |
1315 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1316 | ||
1da177e4 | 1317 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1318 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1319 | nfs_drop_nlink(inode); |
1da177e4 | 1320 | } |
1da177e4 LT |
1321 | iput(inode); |
1322 | } | |
1323 | ||
b1942c5f AV |
1324 | static void nfs_d_release(struct dentry *dentry) |
1325 | { | |
1326 | /* free cached devname value, if it survived that far */ | |
1327 | if (unlikely(dentry->d_fsdata)) { | |
1328 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1329 | WARN_ON(1); | |
1330 | else | |
1331 | kfree(dentry->d_fsdata); | |
1332 | } | |
1333 | } | |
1334 | ||
f786aa90 | 1335 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1336 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1337 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1338 | .d_delete = nfs_dentry_delete, |
1339 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1340 | .d_automount = nfs_d_automount, |
b1942c5f | 1341 | .d_release = nfs_d_release, |
1da177e4 | 1342 | }; |
ddda8e0a | 1343 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1344 | |
597d9289 | 1345 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1346 | { |
1347 | struct dentry *res; | |
565277f6 | 1348 | struct dentry *parent; |
1da177e4 | 1349 | struct inode *inode = NULL; |
e1fb4d05 TM |
1350 | struct nfs_fh *fhandle = NULL; |
1351 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1352 | struct nfs4_label *label = NULL; |
1da177e4 | 1353 | int error; |
1da177e4 | 1354 | |
6de1472f | 1355 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1356 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1357 | |
1358 | res = ERR_PTR(-ENAMETOOLONG); | |
1359 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1360 | goto out; | |
1361 | ||
fd684071 TM |
1362 | /* |
1363 | * If we're doing an exclusive create, optimize away the lookup | |
1364 | * but don't hash the dentry. | |
1365 | */ | |
00cd8dd3 | 1366 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1367 | d_instantiate(dentry, NULL); |
1368 | res = NULL; | |
fc0f684c | 1369 | goto out; |
fd684071 | 1370 | } |
1da177e4 | 1371 | |
e1fb4d05 TM |
1372 | res = ERR_PTR(-ENOMEM); |
1373 | fhandle = nfs_alloc_fhandle(); | |
1374 | fattr = nfs_alloc_fattr(); | |
1375 | if (fhandle == NULL || fattr == NULL) | |
1376 | goto out; | |
1377 | ||
14c43f76 DQ |
1378 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1379 | if (IS_ERR(label)) | |
1380 | goto out; | |
1381 | ||
565277f6 TM |
1382 | parent = dentry->d_parent; |
1383 | /* Protect against concurrent sillydeletes */ | |
6e0d0be7 | 1384 | trace_nfs_lookup_enter(dir, dentry, flags); |
565277f6 | 1385 | nfs_block_sillyrename(parent); |
1775fd3e | 1386 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1387 | if (error == -ENOENT) |
1388 | goto no_entry; | |
1389 | if (error < 0) { | |
1390 | res = ERR_PTR(error); | |
565277f6 | 1391 | goto out_unblock_sillyrename; |
1da177e4 | 1392 | } |
1775fd3e | 1393 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1394 | res = ERR_CAST(inode); |
03f28e3a | 1395 | if (IS_ERR(res)) |
565277f6 | 1396 | goto out_unblock_sillyrename; |
54ceac45 | 1397 | |
d69ee9b8 TM |
1398 | /* Success: notify readdir to use READDIRPLUS */ |
1399 | nfs_advise_use_readdirplus(dir); | |
1400 | ||
1da177e4 | 1401 | no_entry: |
41d28bca | 1402 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1403 | if (res != NULL) { |
1404 | if (IS_ERR(res)) | |
565277f6 | 1405 | goto out_unblock_sillyrename; |
1da177e4 | 1406 | dentry = res; |
9eaef27b | 1407 | } |
1da177e4 | 1408 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1409 | out_unblock_sillyrename: |
1410 | nfs_unblock_sillyrename(parent); | |
6e0d0be7 | 1411 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1412 | nfs4_label_free(label); |
1da177e4 | 1413 | out: |
e1fb4d05 TM |
1414 | nfs_free_fattr(fattr); |
1415 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1416 | return res; |
1417 | } | |
ddda8e0a | 1418 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1419 | |
89d77c8f | 1420 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1421 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1422 | |
f786aa90 | 1423 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1424 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1425 | .d_delete = nfs_dentry_delete, |
1426 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1427 | .d_automount = nfs_d_automount, |
b1942c5f | 1428 | .d_release = nfs_d_release, |
1da177e4 | 1429 | }; |
89d77c8f | 1430 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1431 | |
8a5e929d AV |
1432 | static fmode_t flags_to_mode(int flags) |
1433 | { | |
1434 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1435 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1436 | res |= FMODE_READ; | |
1437 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1438 | res |= FMODE_WRITE; | |
1439 | return res; | |
1440 | } | |
1441 | ||
51141598 | 1442 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1443 | { |
5ede7b1c | 1444 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1445 | } |
1446 | ||
1447 | static int do_open(struct inode *inode, struct file *filp) | |
1448 | { | |
f1fe29b4 | 1449 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1450 | return 0; |
1451 | } | |
1452 | ||
d9585277 AV |
1453 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1454 | struct dentry *dentry, | |
30d90494 | 1455 | struct file *file, unsigned open_flags, |
d9585277 | 1456 | int *opened) |
cd9a1c0e | 1457 | { |
0dd2b474 MS |
1458 | int err; |
1459 | ||
01c919ab MS |
1460 | if ((open_flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
1461 | *opened |= FILE_CREATED; | |
1462 | ||
30d90494 AV |
1463 | err = finish_open(file, dentry, do_open, opened); |
1464 | if (err) | |
d9585277 | 1465 | goto out; |
30d90494 | 1466 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1467 | |
cd9a1c0e | 1468 | out: |
d9585277 | 1469 | return err; |
cd9a1c0e TM |
1470 | } |
1471 | ||
73a79706 BS |
1472 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1473 | struct file *file, unsigned open_flags, | |
1474 | umode_t mode, int *opened) | |
1da177e4 | 1475 | { |
cd9a1c0e | 1476 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1477 | struct dentry *res; |
1478 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1479 | struct inode *inode; |
1472b83e | 1480 | unsigned int lookup_flags = 0; |
898f635c | 1481 | int err; |
1da177e4 | 1482 | |
0dd2b474 MS |
1483 | /* Expect a negative dentry */ |
1484 | BUG_ON(dentry->d_inode); | |
1485 | ||
1e8968c5 | 1486 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1487 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1488 | |
9597c13b JL |
1489 | err = nfs_check_flags(open_flags); |
1490 | if (err) | |
1491 | return err; | |
1492 | ||
0dd2b474 MS |
1493 | /* NFS only supports OPEN on regular files */ |
1494 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1495 | if (!d_unhashed(dentry)) { |
1496 | /* | |
1497 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1498 | * revalidated and is fine, no need to perform lookup | |
1499 | * again | |
1500 | */ | |
d9585277 | 1501 | return -ENOENT; |
0dd2b474 | 1502 | } |
1472b83e | 1503 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1504 | goto no_open; |
02a913a7 | 1505 | } |
1da177e4 | 1506 | |
0dd2b474 | 1507 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1508 | return -ENAMETOOLONG; |
cd9a1c0e | 1509 | |
0dd2b474 | 1510 | if (open_flags & O_CREAT) { |
536e43d1 | 1511 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1512 | attr.ia_mode = mode & ~current_umask(); |
1513 | } | |
536e43d1 TM |
1514 | if (open_flags & O_TRUNC) { |
1515 | attr.ia_valid |= ATTR_SIZE; | |
1516 | attr.ia_size = 0; | |
cd9a1c0e TM |
1517 | } |
1518 | ||
0dd2b474 MS |
1519 | ctx = create_nfs_open_context(dentry, open_flags); |
1520 | err = PTR_ERR(ctx); | |
1521 | if (IS_ERR(ctx)) | |
d9585277 | 1522 | goto out; |
0dd2b474 | 1523 | |
6e0d0be7 | 1524 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
f46e0bd3 | 1525 | nfs_block_sillyrename(dentry->d_parent); |
5bc2afc2 | 1526 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened); |
275bb307 | 1527 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1528 | if (IS_ERR(inode)) { |
0dd2b474 | 1529 | err = PTR_ERR(inode); |
6e0d0be7 | 1530 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1531 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1532 | switch (err) { |
1533 | case -ENOENT: | |
275bb307 | 1534 | d_drop(dentry); |
0dd2b474 | 1535 | d_add(dentry, NULL); |
809fd143 | 1536 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1537 | break; |
1538 | case -EISDIR: | |
1539 | case -ENOTDIR: | |
1540 | goto no_open; | |
1541 | case -ELOOP: | |
1542 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1543 | goto no_open; |
0dd2b474 | 1544 | break; |
1da177e4 | 1545 | /* case -EINVAL: */ |
0dd2b474 MS |
1546 | default: |
1547 | break; | |
1da177e4 | 1548 | } |
d9585277 | 1549 | goto out; |
cd9a1c0e | 1550 | } |
0dd2b474 | 1551 | |
275bb307 | 1552 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
6e0d0be7 | 1553 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1554 | put_nfs_open_context(ctx); |
d9585277 AV |
1555 | out: |
1556 | return err; | |
0dd2b474 | 1557 | |
1da177e4 | 1558 | no_open: |
1472b83e | 1559 | res = nfs_lookup(dir, dentry, lookup_flags); |
0dd2b474 MS |
1560 | err = PTR_ERR(res); |
1561 | if (IS_ERR(res)) | |
d9585277 | 1562 | goto out; |
0dd2b474 | 1563 | |
e45198a6 | 1564 | return finish_no_open(file, res); |
1da177e4 | 1565 | } |
89d77c8f | 1566 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1567 | |
0b728e19 | 1568 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1569 | { |
657e94b6 | 1570 | struct inode *inode; |
50de348c | 1571 | int ret = 0; |
1da177e4 | 1572 | |
fa3c56bb | 1573 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1574 | goto no_open; |
1575 | if (d_mountpoint(dentry)) | |
5584c306 | 1576 | goto no_open; |
49f9a0fa TM |
1577 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1578 | goto no_open; | |
2b484297 | 1579 | |
eda72afb | 1580 | inode = dentry->d_inode; |
2b484297 | 1581 | |
1da177e4 LT |
1582 | /* We can't create new files in nfs_open_revalidate(), so we |
1583 | * optimize away revalidation of negative dentries. | |
1584 | */ | |
216d5d06 | 1585 | if (inode == NULL) { |
49317a7f N |
1586 | struct dentry *parent; |
1587 | struct inode *dir; | |
1588 | ||
912a108d | 1589 | if (flags & LOOKUP_RCU) { |
50d77739 | 1590 | parent = ACCESS_ONCE(dentry->d_parent); |
912a108d N |
1591 | dir = ACCESS_ONCE(parent->d_inode); |
1592 | if (!dir) | |
1593 | return -ECHILD; | |
1594 | } else { | |
1595 | parent = dget_parent(dentry); | |
1596 | dir = parent->d_inode; | |
1597 | } | |
fa3c56bb | 1598 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1599 | ret = 1; |
912a108d N |
1600 | else if (flags & LOOKUP_RCU) |
1601 | ret = -ECHILD; | |
1602 | if (!(flags & LOOKUP_RCU)) | |
1603 | dput(parent); | |
50d77739 | 1604 | else if (parent != ACCESS_ONCE(dentry->d_parent)) |
912a108d | 1605 | return -ECHILD; |
1da177e4 | 1606 | goto out; |
216d5d06 TM |
1607 | } |
1608 | ||
1da177e4 LT |
1609 | /* NFS only supports OPEN on regular files */ |
1610 | if (!S_ISREG(inode->i_mode)) | |
49317a7f | 1611 | goto no_open; |
1da177e4 | 1612 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1613 | if (flags & LOOKUP_EXCL) |
49317a7f | 1614 | goto no_open; |
1da177e4 | 1615 | |
0ef97dcf MS |
1616 | /* Let f_op->open() actually open (and revalidate) the file */ |
1617 | ret = 1; | |
536e43d1 | 1618 | |
1da177e4 | 1619 | out: |
1da177e4 | 1620 | return ret; |
535918f1 | 1621 | |
5584c306 | 1622 | no_open: |
0b728e19 | 1623 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1624 | } |
1625 | ||
1da177e4 LT |
1626 | #endif /* CONFIG_NFSV4 */ |
1627 | ||
1da177e4 LT |
1628 | /* |
1629 | * Code common to create, mkdir, and mknod. | |
1630 | */ | |
1631 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1632 | struct nfs_fattr *fattr, |
1633 | struct nfs4_label *label) | |
1da177e4 | 1634 | { |
fab728e1 TM |
1635 | struct dentry *parent = dget_parent(dentry); |
1636 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1637 | struct inode *inode; |
1638 | int error = -EACCES; | |
1639 | ||
fab728e1 TM |
1640 | d_drop(dentry); |
1641 | ||
1da177e4 LT |
1642 | /* We may have been initialized further down */ |
1643 | if (dentry->d_inode) | |
fab728e1 | 1644 | goto out; |
1da177e4 | 1645 | if (fhandle->size == 0) { |
1775fd3e | 1646 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1647 | if (error) |
fab728e1 | 1648 | goto out_error; |
1da177e4 | 1649 | } |
5724ab37 | 1650 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1651 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1652 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1653 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1654 | if (error < 0) |
fab728e1 | 1655 | goto out_error; |
1da177e4 | 1656 | } |
1775fd3e | 1657 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1658 | error = PTR_ERR(inode); |
1659 | if (IS_ERR(inode)) | |
fab728e1 TM |
1660 | goto out_error; |
1661 | d_add(dentry, inode); | |
1662 | out: | |
1663 | dput(parent); | |
1da177e4 | 1664 | return 0; |
fab728e1 TM |
1665 | out_error: |
1666 | nfs_mark_for_revalidate(dir); | |
1667 | dput(parent); | |
1668 | return error; | |
1da177e4 | 1669 | } |
ddda8e0a | 1670 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1671 | |
1672 | /* | |
1673 | * Following a failed create operation, we drop the dentry rather | |
1674 | * than retain a negative dentry. This avoids a problem in the event | |
1675 | * that the operation succeeded on the server, but an error in the | |
1676 | * reply path made it appear to have failed. | |
1677 | */ | |
597d9289 | 1678 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1679 | umode_t mode, bool excl) |
1da177e4 LT |
1680 | { |
1681 | struct iattr attr; | |
ebfc3b49 | 1682 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1683 | int error; |
1da177e4 | 1684 | |
1e8968c5 | 1685 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 1686 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1687 | |
1688 | attr.ia_mode = mode; | |
1689 | attr.ia_valid = ATTR_MODE; | |
1690 | ||
8b0ad3d4 | 1691 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1692 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1693 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1694 | if (error != 0) |
1695 | goto out_err; | |
1da177e4 LT |
1696 | return 0; |
1697 | out_err: | |
1da177e4 LT |
1698 | d_drop(dentry); |
1699 | return error; | |
1700 | } | |
ddda8e0a | 1701 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1702 | |
1703 | /* | |
1704 | * See comments for nfs_proc_create regarding failed operations. | |
1705 | */ | |
597d9289 | 1706 | int |
1a67aafb | 1707 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1708 | { |
1709 | struct iattr attr; | |
1710 | int status; | |
1711 | ||
1e8968c5 | 1712 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 1713 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1714 | |
1715 | if (!new_valid_dev(rdev)) | |
1716 | return -EINVAL; | |
1717 | ||
1718 | attr.ia_mode = mode; | |
1719 | attr.ia_valid = ATTR_MODE; | |
1720 | ||
1ca42382 | 1721 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1722 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1723 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1724 | if (status != 0) |
1725 | goto out_err; | |
1da177e4 LT |
1726 | return 0; |
1727 | out_err: | |
1da177e4 LT |
1728 | d_drop(dentry); |
1729 | return status; | |
1730 | } | |
ddda8e0a | 1731 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1732 | |
1733 | /* | |
1734 | * See comments for nfs_proc_create regarding failed operations. | |
1735 | */ | |
597d9289 | 1736 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1737 | { |
1738 | struct iattr attr; | |
1739 | int error; | |
1740 | ||
1e8968c5 | 1741 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 1742 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1743 | |
1744 | attr.ia_valid = ATTR_MODE; | |
1745 | attr.ia_mode = mode | S_IFDIR; | |
1746 | ||
1ca42382 | 1747 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1748 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1749 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1750 | if (error != 0) |
1751 | goto out_err; | |
1da177e4 LT |
1752 | return 0; |
1753 | out_err: | |
1754 | d_drop(dentry); | |
1da177e4 LT |
1755 | return error; |
1756 | } | |
ddda8e0a | 1757 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1758 | |
d45b9d8b TM |
1759 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1760 | { | |
1761 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1762 | d_delete(dentry); | |
1763 | } | |
1764 | ||
597d9289 | 1765 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1766 | { |
1767 | int error; | |
1768 | ||
1e8968c5 | 1769 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 1770 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1771 | |
1ca42382 | 1772 | trace_nfs_rmdir_enter(dir, dentry); |
ba6c0592 TM |
1773 | if (dentry->d_inode) { |
1774 | nfs_wait_on_sillyrename(dentry); | |
1775 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1776 | /* Ensure the VFS deletes this inode */ | |
1777 | switch (error) { | |
1778 | case 0: | |
1779 | clear_nlink(dentry->d_inode); | |
1780 | break; | |
1781 | case -ENOENT: | |
1782 | nfs_dentry_handle_enoent(dentry); | |
1783 | } | |
1784 | } else | |
1785 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1786 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1787 | |
1788 | return error; | |
1789 | } | |
ddda8e0a | 1790 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1791 | |
1da177e4 LT |
1792 | /* |
1793 | * Remove a file after making sure there are no pending writes, | |
1794 | * and after checking that the file has only one user. | |
1795 | * | |
1796 | * We invalidate the attribute cache and free the inode prior to the operation | |
1797 | * to avoid possible races if the server reuses the inode. | |
1798 | */ | |
1799 | static int nfs_safe_remove(struct dentry *dentry) | |
1800 | { | |
1801 | struct inode *dir = dentry->d_parent->d_inode; | |
1802 | struct inode *inode = dentry->d_inode; | |
1803 | int error = -EBUSY; | |
1804 | ||
6de1472f | 1805 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
1806 | |
1807 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1808 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1809 | error = 0; | |
1810 | goto out; | |
1811 | } | |
1812 | ||
1ca42382 | 1813 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1814 | if (inode != NULL) { |
57ec14c5 | 1815 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1816 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1817 | if (error == 0) |
1b83d707 | 1818 | nfs_drop_nlink(inode); |
1da177e4 LT |
1819 | } else |
1820 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1821 | if (error == -ENOENT) |
1822 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1823 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1824 | out: |
1825 | return error; | |
1826 | } | |
1827 | ||
1828 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1829 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1830 | * | |
1831 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1832 | */ | |
597d9289 | 1833 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1834 | { |
1835 | int error; | |
1836 | int need_rehash = 0; | |
1837 | ||
1e8968c5 | 1838 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 1839 | dir->i_ino, dentry); |
1da177e4 | 1840 | |
1ca42382 | 1841 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1842 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1843 | if (d_count(dentry) > 1) { |
1da177e4 | 1844 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1845 | /* Start asynchronous writeout of the inode */ |
1846 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1847 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1848 | goto out; |
1da177e4 LT |
1849 | } |
1850 | if (!d_unhashed(dentry)) { | |
1851 | __d_drop(dentry); | |
1852 | need_rehash = 1; | |
1853 | } | |
1854 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1855 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1856 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1857 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1858 | } else if (need_rehash) | |
1859 | d_rehash(dentry); | |
1ca42382 TM |
1860 | out: |
1861 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1862 | return error; |
1863 | } | |
ddda8e0a | 1864 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1865 | |
873101b3 CL |
1866 | /* |
1867 | * To create a symbolic link, most file systems instantiate a new inode, | |
1868 | * add a page to it containing the path, then write it out to the disk | |
1869 | * using prepare_write/commit_write. | |
1870 | * | |
1871 | * Unfortunately the NFS client can't create the in-core inode first | |
1872 | * because it needs a file handle to create an in-core inode (see | |
1873 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1874 | * symlink request has completed on the server. | |
1875 | * | |
1876 | * So instead we allocate a raw page, copy the symname into it, then do | |
1877 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1878 | * now have a new file handle and can instantiate an in-core NFS inode | |
1879 | * and move the raw page into its mapping. | |
1880 | */ | |
597d9289 | 1881 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1882 | { |
873101b3 CL |
1883 | struct page *page; |
1884 | char *kaddr; | |
1da177e4 | 1885 | struct iattr attr; |
873101b3 | 1886 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1887 | int error; |
1888 | ||
1e8968c5 | 1889 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 1890 | dir->i_ino, dentry, symname); |
1da177e4 | 1891 | |
873101b3 CL |
1892 | if (pathlen > PAGE_SIZE) |
1893 | return -ENAMETOOLONG; | |
1da177e4 | 1894 | |
873101b3 CL |
1895 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1896 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1897 | |
83d93f22 | 1898 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1899 | if (!page) |
873101b3 | 1900 | return -ENOMEM; |
873101b3 | 1901 | |
2b86ce2d | 1902 | kaddr = kmap_atomic(page); |
873101b3 CL |
1903 | memcpy(kaddr, symname, pathlen); |
1904 | if (pathlen < PAGE_SIZE) | |
1905 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1906 | kunmap_atomic(kaddr); |
873101b3 | 1907 | |
1ca42382 | 1908 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 1909 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 1910 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 1911 | if (error != 0) { |
1e8968c5 | 1912 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 1913 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 1914 | dentry, symname, error); |
1da177e4 | 1915 | d_drop(dentry); |
873101b3 | 1916 | __free_page(page); |
873101b3 CL |
1917 | return error; |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * No big deal if we can't add this page to the page cache here. | |
1922 | * READLINK will get the missing page from the server if needed. | |
1923 | */ | |
a0b8cab3 | 1924 | if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0, |
873101b3 | 1925 | GFP_KERNEL)) { |
873101b3 CL |
1926 | SetPageUptodate(page); |
1927 | unlock_page(page); | |
a0b54add RA |
1928 | /* |
1929 | * add_to_page_cache_lru() grabs an extra page refcount. | |
1930 | * Drop it here to avoid leaking this page later. | |
1931 | */ | |
1932 | page_cache_release(page); | |
873101b3 CL |
1933 | } else |
1934 | __free_page(page); | |
1935 | ||
873101b3 | 1936 | return 0; |
1da177e4 | 1937 | } |
ddda8e0a | 1938 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1939 | |
597d9289 | 1940 | int |
1da177e4 LT |
1941 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1942 | { | |
1943 | struct inode *inode = old_dentry->d_inode; | |
1944 | int error; | |
1945 | ||
6de1472f AV |
1946 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
1947 | old_dentry, dentry); | |
1da177e4 | 1948 | |
1fd1085b | 1949 | trace_nfs_link_enter(inode, dir, dentry); |
57ec14c5 | 1950 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1951 | |
9697d234 | 1952 | d_drop(dentry); |
1da177e4 | 1953 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1954 | if (error == 0) { |
7de9c6ee | 1955 | ihold(inode); |
9697d234 | 1956 | d_add(dentry, inode); |
cf809556 | 1957 | } |
1fd1085b | 1958 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
1959 | return error; |
1960 | } | |
ddda8e0a | 1961 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1962 | |
1963 | /* | |
1964 | * RENAME | |
1965 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1966 | * different file handle for the same inode after a rename (e.g. when | |
1967 | * moving to a different directory). A fail-safe method to do so would | |
1968 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1969 | * rename the old file using the sillyrename stuff. This way, the original | |
1970 | * file in old_dir will go away when the last process iput()s the inode. | |
1971 | * | |
1972 | * FIXED. | |
1973 | * | |
1974 | * It actually works quite well. One needs to have the possibility for | |
1975 | * at least one ".nfs..." file in each directory the file ever gets | |
1976 | * moved or linked to which happens automagically with the new | |
1977 | * implementation that only depends on the dcache stuff instead of | |
1978 | * using the inode layer | |
1979 | * | |
1980 | * Unfortunately, things are a little more complicated than indicated | |
1981 | * above. For a cross-directory move, we want to make sure we can get | |
1982 | * rid of the old inode after the operation. This means there must be | |
1983 | * no pending writes (if it's a file), and the use count must be 1. | |
1984 | * If these conditions are met, we can drop the dentries before doing | |
1985 | * the rename. | |
1986 | */ | |
597d9289 | 1987 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1988 | struct inode *new_dir, struct dentry *new_dentry) |
1989 | { | |
1990 | struct inode *old_inode = old_dentry->d_inode; | |
1991 | struct inode *new_inode = new_dentry->d_inode; | |
1992 | struct dentry *dentry = NULL, *rehash = NULL; | |
80a491fd | 1993 | struct rpc_task *task; |
1da177e4 LT |
1994 | int error = -EBUSY; |
1995 | ||
6de1472f AV |
1996 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
1997 | old_dentry, new_dentry, | |
84d08fa8 | 1998 | d_count(new_dentry)); |
1da177e4 | 1999 | |
70ded201 | 2000 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 2001 | /* |
28f79a1a MS |
2002 | * For non-directories, check whether the target is busy and if so, |
2003 | * make a copy of the dentry and then do a silly-rename. If the | |
2004 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2005 | * the new target. | |
1da177e4 | 2006 | */ |
27226104 MS |
2007 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2008 | /* | |
2009 | * To prevent any new references to the target during the | |
2010 | * rename, we unhash the dentry in advance. | |
2011 | */ | |
2012 | if (!d_unhashed(new_dentry)) { | |
2013 | d_drop(new_dentry); | |
2014 | rehash = new_dentry; | |
2015 | } | |
1da177e4 | 2016 | |
84d08fa8 | 2017 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2018 | int err; |
2019 | ||
2020 | /* copy the target dentry's name */ | |
2021 | dentry = d_alloc(new_dentry->d_parent, | |
2022 | &new_dentry->d_name); | |
2023 | if (!dentry) | |
2024 | goto out; | |
2025 | ||
2026 | /* silly-rename the existing target ... */ | |
2027 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2028 | if (err) |
27226104 | 2029 | goto out; |
24e93025 MS |
2030 | |
2031 | new_dentry = dentry; | |
56335936 | 2032 | rehash = NULL; |
24e93025 | 2033 | new_inode = NULL; |
27226104 | 2034 | } |
b1e4adf4 | 2035 | } |
1da177e4 | 2036 | |
57ec14c5 | 2037 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 2038 | if (new_inode != NULL) |
57ec14c5 | 2039 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 2040 | |
80a491fd JL |
2041 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
2042 | if (IS_ERR(task)) { | |
2043 | error = PTR_ERR(task); | |
2044 | goto out; | |
2045 | } | |
2046 | ||
2047 | error = rpc_wait_for_completion_task(task); | |
2048 | if (error == 0) | |
2049 | error = task->tk_status; | |
2050 | rpc_put_task(task); | |
5ba7cc48 | 2051 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
2052 | out: |
2053 | if (rehash) | |
2054 | d_rehash(rehash); | |
70ded201 TM |
2055 | trace_nfs_rename_exit(old_dir, old_dentry, |
2056 | new_dir, new_dentry, error); | |
1da177e4 | 2057 | if (!error) { |
b1e4adf4 TM |
2058 | if (new_inode != NULL) |
2059 | nfs_drop_nlink(new_inode); | |
349457cc | 2060 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
2061 | nfs_set_verifier(new_dentry, |
2062 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
2063 | } else if (error == -ENOENT) |
2064 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
2065 | |
2066 | /* new dentry created? */ | |
2067 | if (dentry) | |
2068 | dput(dentry); | |
1da177e4 LT |
2069 | return error; |
2070 | } | |
ddda8e0a | 2071 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2072 | |
cfcea3e8 TM |
2073 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2074 | static LIST_HEAD(nfs_access_lru_list); | |
2075 | static atomic_long_t nfs_access_nr_entries; | |
2076 | ||
3a505845 TM |
2077 | static unsigned long nfs_access_max_cachesize = ULONG_MAX; |
2078 | module_param(nfs_access_max_cachesize, ulong, 0644); | |
2079 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2080 | ||
1c3c07e9 TM |
2081 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2082 | { | |
2083 | put_rpccred(entry->cred); | |
f682a398 | 2084 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2085 | smp_mb__before_atomic(); |
cfcea3e8 | 2086 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2087 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2088 | } |
2089 | ||
1a81bb8a TM |
2090 | static void nfs_access_free_list(struct list_head *head) |
2091 | { | |
2092 | struct nfs_access_entry *cache; | |
2093 | ||
2094 | while (!list_empty(head)) { | |
2095 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2096 | list_del(&cache->lru); | |
2097 | nfs_access_free_entry(cache); | |
2098 | } | |
2099 | } | |
2100 | ||
3a505845 TM |
2101 | static unsigned long |
2102 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2103 | { |
2104 | LIST_HEAD(head); | |
aa510da5 | 2105 | struct nfs_inode *nfsi, *next; |
979df72e | 2106 | struct nfs_access_entry *cache; |
1ab6c499 | 2107 | long freed = 0; |
979df72e | 2108 | |
a50f7951 | 2109 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2110 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2111 | struct inode *inode; |
2112 | ||
2113 | if (nr_to_scan-- == 0) | |
2114 | break; | |
9c7e7e23 | 2115 | inode = &nfsi->vfs_inode; |
979df72e TM |
2116 | spin_lock(&inode->i_lock); |
2117 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2118 | goto remove_lru_entry; | |
2119 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2120 | struct nfs_access_entry, lru); | |
2121 | list_move(&cache->lru, &head); | |
2122 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2123 | freed++; |
979df72e TM |
2124 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2125 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2126 | &nfs_access_lru_list); | |
2127 | else { | |
2128 | remove_lru_entry: | |
2129 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2130 | smp_mb__before_atomic(); |
979df72e | 2131 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2132 | smp_mb__after_atomic(); |
979df72e | 2133 | } |
59844a9b | 2134 | spin_unlock(&inode->i_lock); |
979df72e TM |
2135 | } |
2136 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2137 | nfs_access_free_list(&head); |
1ab6c499 DC |
2138 | return freed; |
2139 | } | |
2140 | ||
3a505845 TM |
2141 | unsigned long |
2142 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2143 | { | |
2144 | int nr_to_scan = sc->nr_to_scan; | |
2145 | gfp_t gfp_mask = sc->gfp_mask; | |
2146 | ||
2147 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2148 | return SHRINK_STOP; | |
2149 | return nfs_do_access_cache_scan(nr_to_scan); | |
2150 | } | |
2151 | ||
2152 | ||
1ab6c499 DC |
2153 | unsigned long |
2154 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2155 | { | |
55f841ce | 2156 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2157 | } |
2158 | ||
3a505845 TM |
2159 | static void |
2160 | nfs_access_cache_enforce_limit(void) | |
2161 | { | |
2162 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2163 | unsigned long diff; | |
2164 | unsigned int nr_to_scan; | |
2165 | ||
2166 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2167 | return; | |
2168 | nr_to_scan = 100; | |
2169 | diff = nr_entries - nfs_access_max_cachesize; | |
2170 | if (diff < nr_to_scan) | |
2171 | nr_to_scan = diff; | |
2172 | nfs_do_access_cache_scan(nr_to_scan); | |
2173 | } | |
2174 | ||
1a81bb8a | 2175 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2176 | { |
1c3c07e9 | 2177 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2178 | struct rb_node *n; |
1c3c07e9 TM |
2179 | struct nfs_access_entry *entry; |
2180 | ||
2181 | /* Unhook entries from the cache */ | |
2182 | while ((n = rb_first(root_node)) != NULL) { | |
2183 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2184 | rb_erase(n, root_node); | |
1a81bb8a | 2185 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2186 | } |
2187 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2188 | } |
2189 | ||
1c3c07e9 | 2190 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2191 | { |
1a81bb8a TM |
2192 | LIST_HEAD(head); |
2193 | ||
2194 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2195 | return; | |
cfcea3e8 | 2196 | /* Remove from global LRU init */ |
1a81bb8a TM |
2197 | spin_lock(&nfs_access_lru_lock); |
2198 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2199 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2200 | |
1c3c07e9 | 2201 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2202 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2203 | spin_unlock(&inode->i_lock); | |
2204 | spin_unlock(&nfs_access_lru_lock); | |
2205 | nfs_access_free_list(&head); | |
1c3c07e9 | 2206 | } |
1c606fb7 | 2207 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2208 | |
1c3c07e9 TM |
2209 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2210 | { | |
2211 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2212 | struct nfs_access_entry *entry; | |
2213 | ||
2214 | while (n != NULL) { | |
2215 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2216 | ||
2217 | if (cred < entry->cred) | |
2218 | n = n->rb_left; | |
2219 | else if (cred > entry->cred) | |
2220 | n = n->rb_right; | |
2221 | else | |
2222 | return entry; | |
1da177e4 | 2223 | } |
1c3c07e9 TM |
2224 | return NULL; |
2225 | } | |
2226 | ||
af22f94a | 2227 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2228 | { |
2229 | struct nfs_inode *nfsi = NFS_I(inode); | |
2230 | struct nfs_access_entry *cache; | |
2231 | int err = -ENOENT; | |
2232 | ||
dc59250c | 2233 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2234 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2235 | goto out_zap; | |
2236 | cache = nfs_access_search_rbtree(inode, cred); | |
2237 | if (cache == NULL) | |
2238 | goto out; | |
b4d2314b | 2239 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2240 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2241 | goto out_stale; |
2242 | res->jiffies = cache->jiffies; | |
2243 | res->cred = cache->cred; | |
2244 | res->mask = cache->mask; | |
cfcea3e8 | 2245 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2246 | err = 0; |
2247 | out: | |
2248 | spin_unlock(&inode->i_lock); | |
2249 | return err; | |
2250 | out_stale: | |
2251 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2252 | list_del(&cache->lru); |
1c3c07e9 TM |
2253 | spin_unlock(&inode->i_lock); |
2254 | nfs_access_free_entry(cache); | |
2255 | return -ENOENT; | |
2256 | out_zap: | |
1a81bb8a TM |
2257 | spin_unlock(&inode->i_lock); |
2258 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2259 | return -ENOENT; |
2260 | } | |
2261 | ||
f682a398 N |
2262 | static int nfs_access_get_cached_rcu(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
2263 | { | |
2264 | /* Only check the most recently returned cache entry, | |
2265 | * but do it without locking. | |
2266 | */ | |
2267 | struct nfs_inode *nfsi = NFS_I(inode); | |
2268 | struct nfs_access_entry *cache; | |
2269 | int err = -ECHILD; | |
2270 | struct list_head *lh; | |
2271 | ||
2272 | rcu_read_lock(); | |
2273 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2274 | goto out; | |
2275 | lh = rcu_dereference(nfsi->access_cache_entry_lru.prev); | |
2276 | cache = list_entry(lh, struct nfs_access_entry, lru); | |
2277 | if (lh == &nfsi->access_cache_entry_lru || | |
2278 | cred != cache->cred) | |
2279 | cache = NULL; | |
2280 | if (cache == NULL) | |
2281 | goto out; | |
2282 | if (!nfs_have_delegated_attributes(inode) && | |
2283 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) | |
2284 | goto out; | |
2285 | res->jiffies = cache->jiffies; | |
2286 | res->cred = cache->cred; | |
2287 | res->mask = cache->mask; | |
2288 | err = 0; | |
2289 | out: | |
2290 | rcu_read_unlock(); | |
2291 | return err; | |
2292 | } | |
2293 | ||
1c3c07e9 TM |
2294 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2295 | { | |
cfcea3e8 TM |
2296 | struct nfs_inode *nfsi = NFS_I(inode); |
2297 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2298 | struct rb_node **p = &root_node->rb_node; |
2299 | struct rb_node *parent = NULL; | |
2300 | struct nfs_access_entry *entry; | |
2301 | ||
2302 | spin_lock(&inode->i_lock); | |
2303 | while (*p != NULL) { | |
2304 | parent = *p; | |
2305 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2306 | ||
2307 | if (set->cred < entry->cred) | |
2308 | p = &parent->rb_left; | |
2309 | else if (set->cred > entry->cred) | |
2310 | p = &parent->rb_right; | |
2311 | else | |
2312 | goto found; | |
2313 | } | |
2314 | rb_link_node(&set->rb_node, parent, p); | |
2315 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2316 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2317 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2318 | return; |
2319 | found: | |
2320 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2321 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2322 | list_del(&entry->lru); | |
1c3c07e9 TM |
2323 | spin_unlock(&inode->i_lock); |
2324 | nfs_access_free_entry(entry); | |
2325 | } | |
2326 | ||
6168f62c | 2327 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2328 | { |
2329 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2330 | if (cache == NULL) | |
2331 | return; | |
2332 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2333 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2334 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2335 | cache->mask = set->mask; |
1c3c07e9 | 2336 | |
f682a398 N |
2337 | /* The above field assignments must be visible |
2338 | * before this item appears on the lru. We cannot easily | |
2339 | * use rcu_assign_pointer, so just force the memory barrier. | |
2340 | */ | |
2341 | smp_wmb(); | |
1c3c07e9 | 2342 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2343 | |
2344 | /* Update accounting */ | |
4e857c58 | 2345 | smp_mb__before_atomic(); |
cfcea3e8 | 2346 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2347 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2348 | |
2349 | /* Add inode to global LRU list */ | |
1a81bb8a | 2350 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2351 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2352 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2353 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2354 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2355 | spin_unlock(&nfs_access_lru_lock); |
2356 | } | |
3a505845 | 2357 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2358 | } |
6168f62c WAA |
2359 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2360 | ||
2361 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2362 | { | |
2363 | entry->mask = 0; | |
2364 | if (access_result & NFS4_ACCESS_READ) | |
2365 | entry->mask |= MAY_READ; | |
2366 | if (access_result & | |
2367 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2368 | entry->mask |= MAY_WRITE; | |
2369 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2370 | entry->mask |= MAY_EXEC; | |
2371 | } | |
2372 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2373 | |
2374 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2375 | { | |
2376 | struct nfs_access_entry cache; | |
2377 | int status; | |
2378 | ||
f4ce1299 TM |
2379 | trace_nfs_access_enter(inode); |
2380 | ||
f682a398 N |
2381 | status = nfs_access_get_cached_rcu(inode, cred, &cache); |
2382 | if (status != 0) | |
2383 | status = nfs_access_get_cached(inode, cred, &cache); | |
1da177e4 | 2384 | if (status == 0) |
f4ce1299 | 2385 | goto out_cached; |
1da177e4 | 2386 | |
f3324a2a N |
2387 | status = -ECHILD; |
2388 | if (mask & MAY_NOT_BLOCK) | |
2389 | goto out; | |
2390 | ||
1da177e4 LT |
2391 | /* Be clever: ask server to check for all possible rights */ |
2392 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2393 | cache.cred = cred; | |
2394 | cache.jiffies = jiffies; | |
2395 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2396 | if (status != 0) { |
2397 | if (status == -ESTALE) { | |
2398 | nfs_zap_caches(inode); | |
2399 | if (!S_ISDIR(inode->i_mode)) | |
2400 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2401 | } | |
f4ce1299 | 2402 | goto out; |
a71ee337 | 2403 | } |
1da177e4 | 2404 | nfs_access_add_cache(inode, &cache); |
f4ce1299 TM |
2405 | out_cached: |
2406 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) | |
2407 | status = -EACCES; | |
1da177e4 | 2408 | out: |
f4ce1299 TM |
2409 | trace_nfs_access_exit(inode, status); |
2410 | return status; | |
1da177e4 LT |
2411 | } |
2412 | ||
af22f94a TM |
2413 | static int nfs_open_permission_mask(int openflags) |
2414 | { | |
2415 | int mask = 0; | |
2416 | ||
f8d9a897 WAA |
2417 | if (openflags & __FMODE_EXEC) { |
2418 | /* ONLY check exec rights */ | |
2419 | mask = MAY_EXEC; | |
2420 | } else { | |
2421 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2422 | mask |= MAY_READ; | |
2423 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2424 | mask |= MAY_WRITE; | |
2425 | } | |
2426 | ||
af22f94a TM |
2427 | return mask; |
2428 | } | |
2429 | ||
2430 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2431 | { | |
2432 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2433 | } | |
89d77c8f | 2434 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2435 | |
10556cb2 | 2436 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2437 | { |
2438 | struct rpc_cred *cred; | |
2439 | int res = 0; | |
2440 | ||
91d5b470 CL |
2441 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2442 | ||
e6305c43 | 2443 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2444 | goto out; |
2445 | /* Is this sys_access() ? */ | |
9cfcac81 | 2446 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2447 | goto force_lookup; |
2448 | ||
2449 | switch (inode->i_mode & S_IFMT) { | |
2450 | case S_IFLNK: | |
2451 | goto out; | |
2452 | case S_IFREG: | |
1da177e4 LT |
2453 | break; |
2454 | case S_IFDIR: | |
2455 | /* | |
2456 | * Optimize away all write operations, since the server | |
2457 | * will check permissions when we perform the op. | |
2458 | */ | |
2459 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2460 | goto out; | |
2461 | } | |
2462 | ||
2463 | force_lookup: | |
1da177e4 LT |
2464 | if (!NFS_PROTO(inode)->access) |
2465 | goto out_notsup; | |
2466 | ||
f3324a2a N |
2467 | /* Always try fast lookups first */ |
2468 | rcu_read_lock(); | |
2469 | cred = rpc_lookup_cred_nonblock(); | |
2470 | if (!IS_ERR(cred)) | |
2471 | res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK); | |
2472 | else | |
1da177e4 | 2473 | res = PTR_ERR(cred); |
f3324a2a N |
2474 | rcu_read_unlock(); |
2475 | if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) { | |
2476 | /* Fast lookup failed, try the slow way */ | |
2477 | cred = rpc_lookup_cred(); | |
2478 | if (!IS_ERR(cred)) { | |
2479 | res = nfs_do_access(inode, cred, mask); | |
2480 | put_rpccred(cred); | |
2481 | } else | |
2482 | res = PTR_ERR(cred); | |
2483 | } | |
1da177e4 | 2484 | out: |
f696a365 MS |
2485 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2486 | res = -EACCES; | |
2487 | ||
1e8968c5 | 2488 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2489 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2490 | return res; |
2491 | out_notsup: | |
d51ac1a8 N |
2492 | if (mask & MAY_NOT_BLOCK) |
2493 | return -ECHILD; | |
2494 | ||
1da177e4 LT |
2495 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
2496 | if (res == 0) | |
2830ba7f | 2497 | res = generic_permission(inode, mask); |
1e7cb3dc | 2498 | goto out; |
1da177e4 | 2499 | } |
ddda8e0a | 2500 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2501 | |
2502 | /* | |
2503 | * Local variables: | |
2504 | * version-control: t | |
2505 | * kept-new-versions: 5 | |
2506 | * End: | |
2507 | */ |