Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
20 | #include <linux/time.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/stat.h> | |
23 | #include <linux/fcntl.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/sunrpc/clnt.h> | |
29 | #include <linux/nfs_fs.h> | |
30 | #include <linux/nfs_mount.h> | |
31 | #include <linux/pagemap.h> | |
873101b3 | 32 | #include <linux/pagevec.h> |
1da177e4 | 33 | #include <linux/namei.h> |
54ceac45 | 34 | #include <linux/mount.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
04e4bd1c | 36 | #include <linux/kmemleak.h> |
64c2ce8b | 37 | #include <linux/xattr.h> |
1da177e4 LT |
38 | |
39 | #include "delegation.h" | |
91d5b470 | 40 | #include "iostat.h" |
4c30d56e | 41 | #include "internal.h" |
cd9a1c0e | 42 | #include "fscache.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | /* #define NFS_DEBUG_VERBOSE 1 */ |
45 | ||
46 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 47 | static int nfs_closedir(struct inode *, struct file *); |
1da177e4 | 48 | static int nfs_readdir(struct file *, void *, filldir_t); |
02c24a82 | 49 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 50 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 51 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 52 | |
4b6f5d20 | 53 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 54 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
55 | .read = generic_read_dir, |
56 | .readdir = nfs_readdir, | |
57 | .open = nfs_opendir, | |
480c2006 | 58 | .release = nfs_closedir, |
1da177e4 LT |
59 | .fsync = nfs_fsync_dir, |
60 | }; | |
61 | ||
11de3b11 TM |
62 | const struct address_space_operations nfs_dir_aops = { |
63 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
64 | }; |
65 | ||
1da177e4 LT |
66 | #ifdef CONFIG_NFS_V4 |
67 | ||
d9585277 | 68 | static int nfs_atomic_open(struct inode *, struct dentry *, |
30d90494 | 69 | struct file *, unsigned, umode_t, |
d9585277 | 70 | int *); |
92e1d5be | 71 | const struct inode_operations nfs4_dir_inode_operations = { |
8867fe58 | 72 | .create = nfs_create, |
0dd2b474 MS |
73 | .lookup = nfs_lookup, |
74 | .atomic_open = nfs_atomic_open, | |
1da177e4 LT |
75 | .link = nfs_link, |
76 | .unlink = nfs_unlink, | |
77 | .symlink = nfs_symlink, | |
78 | .mkdir = nfs_mkdir, | |
79 | .rmdir = nfs_rmdir, | |
80 | .mknod = nfs_mknod, | |
81 | .rename = nfs_rename, | |
82 | .permission = nfs_permission, | |
83 | .getattr = nfs_getattr, | |
84 | .setattr = nfs_setattr, | |
64c2ce8b AK |
85 | .getxattr = generic_getxattr, |
86 | .setxattr = generic_setxattr, | |
87 | .listxattr = generic_listxattr, | |
88 | .removexattr = generic_removexattr, | |
1da177e4 LT |
89 | }; |
90 | ||
91 | #endif /* CONFIG_NFS_V4 */ | |
92 | ||
0c030806 | 93 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
94 | { |
95 | struct nfs_open_dir_context *ctx; | |
96 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
97 | if (ctx != NULL) { | |
8ef2ce3e | 98 | ctx->duped = 0; |
0c030806 | 99 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 100 | ctx->dir_cookie = 0; |
8ef2ce3e | 101 | ctx->dup_cookie = 0; |
480c2006 | 102 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
103 | return ctx; |
104 | } | |
105 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
106 | } |
107 | ||
108 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
109 | { | |
110 | put_rpccred(ctx->cred); | |
111 | kfree(ctx); | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* |
115 | * Open file | |
116 | */ | |
117 | static int | |
118 | nfs_opendir(struct inode *inode, struct file *filp) | |
119 | { | |
480c2006 BS |
120 | int res = 0; |
121 | struct nfs_open_dir_context *ctx; | |
122 | struct rpc_cred *cred; | |
1da177e4 | 123 | |
6da24bc9 | 124 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
125 | filp->f_path.dentry->d_parent->d_name.name, |
126 | filp->f_path.dentry->d_name.name); | |
127 | ||
128 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 129 | |
480c2006 BS |
130 | cred = rpc_lookup_cred(); |
131 | if (IS_ERR(cred)) | |
132 | return PTR_ERR(cred); | |
0c030806 | 133 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
134 | if (IS_ERR(ctx)) { |
135 | res = PTR_ERR(ctx); | |
136 | goto out; | |
137 | } | |
138 | filp->private_data = ctx; | |
f5a73672 NB |
139 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
140 | /* This is a mountpoint, so d_revalidate will never | |
141 | * have been called, so we need to refresh the | |
142 | * inode (for close-open consistency) ourselves. | |
143 | */ | |
144 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
145 | } | |
480c2006 BS |
146 | out: |
147 | put_rpccred(cred); | |
1da177e4 LT |
148 | return res; |
149 | } | |
150 | ||
480c2006 BS |
151 | static int |
152 | nfs_closedir(struct inode *inode, struct file *filp) | |
153 | { | |
154 | put_nfs_open_dir_context(filp->private_data); | |
155 | return 0; | |
156 | } | |
157 | ||
d1bacf9e BS |
158 | struct nfs_cache_array_entry { |
159 | u64 cookie; | |
160 | u64 ino; | |
161 | struct qstr string; | |
0b26a0bf | 162 | unsigned char d_type; |
d1bacf9e BS |
163 | }; |
164 | ||
165 | struct nfs_cache_array { | |
88b8e133 | 166 | int size; |
d1bacf9e BS |
167 | int eof_index; |
168 | u64 last_cookie; | |
169 | struct nfs_cache_array_entry array[0]; | |
170 | }; | |
171 | ||
573c4e1e | 172 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
173 | typedef struct { |
174 | struct file *file; | |
175 | struct page *page; | |
176 | unsigned long page_index; | |
f0dd2136 | 177 | u64 *dir_cookie; |
0aded708 | 178 | u64 last_cookie; |
f0dd2136 | 179 | loff_t current_index; |
1da177e4 | 180 | decode_dirent_t decode; |
d1bacf9e | 181 | |
1f4eab7e | 182 | unsigned long timestamp; |
4704f0e2 | 183 | unsigned long gencount; |
d1bacf9e BS |
184 | unsigned int cache_entry_index; |
185 | unsigned int plus:1; | |
186 | unsigned int eof:1; | |
1da177e4 LT |
187 | } nfs_readdir_descriptor_t; |
188 | ||
d1bacf9e BS |
189 | /* |
190 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
191 | */ |
192 | static | |
d1bacf9e BS |
193 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
194 | { | |
8cd51a0c | 195 | void *ptr; |
d1bacf9e BS |
196 | if (page == NULL) |
197 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
198 | ptr = kmap(page); |
199 | if (ptr == NULL) | |
200 | return ERR_PTR(-ENOMEM); | |
201 | return ptr; | |
d1bacf9e BS |
202 | } |
203 | ||
204 | static | |
205 | void nfs_readdir_release_array(struct page *page) | |
206 | { | |
207 | kunmap(page); | |
208 | } | |
209 | ||
210 | /* | |
211 | * we are freeing strings created by nfs_add_to_readdir_array() | |
212 | */ | |
213 | static | |
11de3b11 | 214 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 215 | { |
11de3b11 | 216 | struct nfs_cache_array *array; |
d1bacf9e | 217 | int i; |
8cd51a0c | 218 | |
2b86ce2d | 219 | array = kmap_atomic(page); |
d1bacf9e BS |
220 | for (i = 0; i < array->size; i++) |
221 | kfree(array->array[i].string.name); | |
2b86ce2d | 222 | kunmap_atomic(array); |
d1bacf9e BS |
223 | } |
224 | ||
225 | /* | |
226 | * the caller is responsible for freeing qstr.name | |
227 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
228 | * nfs_clear_readdir_array() | |
229 | */ | |
230 | static | |
4a201d6e | 231 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
232 | { |
233 | string->len = len; | |
234 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
235 | if (string->name == NULL) |
236 | return -ENOMEM; | |
04e4bd1c CM |
237 | /* |
238 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
239 | * in a page cache page which kmemleak does not scan. | |
240 | */ | |
241 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
242 | string->hash = full_name_hash(name, len); |
243 | return 0; | |
d1bacf9e BS |
244 | } |
245 | ||
246 | static | |
247 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
248 | { | |
249 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
250 | struct nfs_cache_array_entry *cache_entry; |
251 | int ret; | |
252 | ||
d1bacf9e BS |
253 | if (IS_ERR(array)) |
254 | return PTR_ERR(array); | |
3020093f TM |
255 | |
256 | cache_entry = &array->array[array->size]; | |
257 | ||
258 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 259 | ret = -ENOSPC; |
3020093f | 260 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 261 | goto out; |
d1bacf9e | 262 | |
4a201d6e TM |
263 | cache_entry->cookie = entry->prev_cookie; |
264 | cache_entry->ino = entry->ino; | |
0b26a0bf | 265 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
266 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
267 | if (ret) | |
268 | goto out; | |
d1bacf9e | 269 | array->last_cookie = entry->cookie; |
8cd51a0c | 270 | array->size++; |
47c716cb | 271 | if (entry->eof != 0) |
d1bacf9e | 272 | array->eof_index = array->size; |
4a201d6e | 273 | out: |
d1bacf9e | 274 | nfs_readdir_release_array(page); |
4a201d6e | 275 | return ret; |
d1bacf9e BS |
276 | } |
277 | ||
278 | static | |
279 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
280 | { | |
281 | loff_t diff = desc->file->f_pos - desc->current_index; | |
282 | unsigned int index; | |
283 | ||
284 | if (diff < 0) | |
285 | goto out_eof; | |
286 | if (diff >= array->size) { | |
8cd51a0c | 287 | if (array->eof_index >= 0) |
d1bacf9e | 288 | goto out_eof; |
d1bacf9e BS |
289 | return -EAGAIN; |
290 | } | |
291 | ||
292 | index = (unsigned int)diff; | |
293 | *desc->dir_cookie = array->array[index].cookie; | |
294 | desc->cache_entry_index = index; | |
d1bacf9e BS |
295 | return 0; |
296 | out_eof: | |
297 | desc->eof = 1; | |
298 | return -EBADCOOKIE; | |
299 | } | |
300 | ||
301 | static | |
302 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
303 | { | |
304 | int i; | |
8ef2ce3e | 305 | loff_t new_pos; |
d1bacf9e BS |
306 | int status = -EAGAIN; |
307 | ||
308 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 309 | if (array->array[i].cookie == *desc->dir_cookie) { |
0c030806 TM |
310 | struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode); |
311 | struct nfs_open_dir_context *ctx = desc->file->private_data; | |
312 | ||
8ef2ce3e | 313 | new_pos = desc->current_index + i; |
0c030806 TM |
314 | if (ctx->attr_gencount != nfsi->attr_gencount |
315 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
316 | ctx->duped = 0; | |
317 | ctx->attr_gencount = nfsi->attr_gencount; | |
318 | } else if (new_pos < desc->file->f_pos) { | |
319 | if (ctx->duped > 0 | |
320 | && ctx->dup_cookie == *desc->dir_cookie) { | |
321 | if (printk_ratelimit()) { | |
322 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
323 | "Please contact your server vendor. " | |
374e4e3e | 324 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
325 | desc->file->f_dentry->d_parent->d_name.name, |
326 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 327 | array->array[i].string.name, |
0c030806 TM |
328 | *desc->dir_cookie); |
329 | } | |
330 | status = -ELOOP; | |
331 | goto out; | |
332 | } | |
8ef2ce3e | 333 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 334 | ctx->duped = -1; |
8ef2ce3e BS |
335 | } |
336 | desc->file->f_pos = new_pos; | |
d1bacf9e | 337 | desc->cache_entry_index = i; |
47c716cb | 338 | return 0; |
d1bacf9e BS |
339 | } |
340 | } | |
47c716cb | 341 | if (array->eof_index >= 0) { |
8cd51a0c | 342 | status = -EBADCOOKIE; |
18fb5fe4 TM |
343 | if (*desc->dir_cookie == array->last_cookie) |
344 | desc->eof = 1; | |
8cd51a0c | 345 | } |
0c030806 | 346 | out: |
d1bacf9e BS |
347 | return status; |
348 | } | |
349 | ||
350 | static | |
351 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
352 | { | |
353 | struct nfs_cache_array *array; | |
47c716cb | 354 | int status; |
d1bacf9e BS |
355 | |
356 | array = nfs_readdir_get_array(desc->page); | |
357 | if (IS_ERR(array)) { | |
358 | status = PTR_ERR(array); | |
359 | goto out; | |
360 | } | |
361 | ||
362 | if (*desc->dir_cookie == 0) | |
363 | status = nfs_readdir_search_for_pos(array, desc); | |
364 | else | |
365 | status = nfs_readdir_search_for_cookie(array, desc); | |
366 | ||
47c716cb | 367 | if (status == -EAGAIN) { |
0aded708 | 368 | desc->last_cookie = array->last_cookie; |
e47c085a | 369 | desc->current_index += array->size; |
47c716cb TM |
370 | desc->page_index++; |
371 | } | |
d1bacf9e BS |
372 | nfs_readdir_release_array(desc->page); |
373 | out: | |
374 | return status; | |
375 | } | |
376 | ||
377 | /* Fill a page with xdr information before transferring to the cache page */ | |
378 | static | |
56e4ebf8 | 379 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 380 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 381 | { |
480c2006 BS |
382 | struct nfs_open_dir_context *ctx = file->private_data; |
383 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 384 | unsigned long timestamp, gencount; |
1da177e4 LT |
385 | int error; |
386 | ||
1da177e4 LT |
387 | again: |
388 | timestamp = jiffies; | |
4704f0e2 | 389 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 390 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
391 | NFS_SERVER(inode)->dtsize, desc->plus); |
392 | if (error < 0) { | |
393 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
394 | if (error == -ENOTSUPP && desc->plus) { | |
395 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 396 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
397 | desc->plus = 0; |
398 | goto again; | |
399 | } | |
400 | goto error; | |
401 | } | |
1f4eab7e | 402 | desc->timestamp = timestamp; |
4704f0e2 | 403 | desc->gencount = gencount; |
d1bacf9e BS |
404 | error: |
405 | return error; | |
1da177e4 LT |
406 | } |
407 | ||
573c4e1e CL |
408 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
409 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 410 | { |
573c4e1e | 411 | int error; |
1da177e4 | 412 | |
573c4e1e CL |
413 | error = desc->decode(xdr, entry, desc->plus); |
414 | if (error) | |
415 | return error; | |
d1bacf9e BS |
416 | entry->fattr->time_start = desc->timestamp; |
417 | entry->fattr->gencount = desc->gencount; | |
418 | return 0; | |
1da177e4 LT |
419 | } |
420 | ||
d39ab9de BS |
421 | static |
422 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
423 | { | |
d39ab9de BS |
424 | if (dentry->d_inode == NULL) |
425 | goto different; | |
37a09f07 | 426 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
427 | goto different; |
428 | return 1; | |
429 | different: | |
430 | return 0; | |
431 | } | |
432 | ||
d69ee9b8 TM |
433 | static |
434 | bool nfs_use_readdirplus(struct inode *dir, struct file *filp) | |
435 | { | |
436 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
437 | return false; | |
438 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
439 | return true; | |
440 | if (filp->f_pos == 0) | |
441 | return true; | |
442 | return false; | |
443 | } | |
444 | ||
445 | /* | |
446 | * This function is called by the lookup code to request the use of | |
447 | * readdirplus to accelerate any future lookups in the same | |
448 | * directory. | |
449 | */ | |
450 | static | |
451 | void nfs_advise_use_readdirplus(struct inode *dir) | |
452 | { | |
453 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
454 | } | |
455 | ||
d39ab9de BS |
456 | static |
457 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
458 | { | |
26fe5750 | 459 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
460 | struct dentry *dentry; |
461 | struct dentry *alias; | |
d39ab9de BS |
462 | struct inode *dir = parent->d_inode; |
463 | struct inode *inode; | |
464 | ||
4a201d6e TM |
465 | if (filename.name[0] == '.') { |
466 | if (filename.len == 1) | |
467 | return; | |
468 | if (filename.len == 2 && filename.name[1] == '.') | |
469 | return; | |
470 | } | |
471 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 472 | |
4a201d6e | 473 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
474 | if (dentry != NULL) { |
475 | if (nfs_same_file(dentry, entry)) { | |
476 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
477 | goto out; | |
478 | } else { | |
479 | d_drop(dentry); | |
480 | dput(dentry); | |
481 | } | |
482 | } | |
483 | ||
484 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
485 | if (dentry == NULL) |
486 | return; | |
487 | ||
d39ab9de BS |
488 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
489 | if (IS_ERR(inode)) | |
490 | goto out; | |
491 | ||
492 | alias = d_materialise_unique(dentry, inode); | |
493 | if (IS_ERR(alias)) | |
494 | goto out; | |
495 | else if (alias) { | |
496 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
497 | dput(alias); | |
498 | } else | |
499 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
500 | ||
501 | out: | |
502 | dput(dentry); | |
d39ab9de BS |
503 | } |
504 | ||
d1bacf9e BS |
505 | /* Perform conversion from xdr to cache array */ |
506 | static | |
8cd51a0c | 507 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 508 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 509 | { |
babddc72 | 510 | struct xdr_stream stream; |
f7da7a12 | 511 | struct xdr_buf buf; |
6650239a | 512 | struct page *scratch; |
99424380 | 513 | struct nfs_cache_array *array; |
5c346854 TM |
514 | unsigned int count = 0; |
515 | int status; | |
babddc72 | 516 | |
6650239a TM |
517 | scratch = alloc_page(GFP_KERNEL); |
518 | if (scratch == NULL) | |
519 | return -ENOMEM; | |
babddc72 | 520 | |
f7da7a12 | 521 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 522 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
523 | |
524 | do { | |
525 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
526 | if (status != 0) { |
527 | if (status == -EAGAIN) | |
528 | status = 0; | |
99424380 | 529 | break; |
8cd51a0c | 530 | } |
99424380 | 531 | |
5c346854 TM |
532 | count++; |
533 | ||
47c716cb | 534 | if (desc->plus != 0) |
d39ab9de | 535 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
536 | |
537 | status = nfs_readdir_add_to_array(entry, page); | |
538 | if (status != 0) | |
539 | break; | |
99424380 BS |
540 | } while (!entry->eof); |
541 | ||
47c716cb | 542 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 543 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
544 | if (!IS_ERR(array)) { |
545 | array->eof_index = array->size; | |
546 | status = 0; | |
547 | nfs_readdir_release_array(page); | |
5c346854 TM |
548 | } else |
549 | status = PTR_ERR(array); | |
1da177e4 | 550 | } |
6650239a TM |
551 | |
552 | put_page(scratch); | |
8cd51a0c | 553 | return status; |
56e4ebf8 BS |
554 | } |
555 | ||
556 | static | |
557 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
558 | { | |
559 | unsigned int i; | |
560 | for (i = 0; i < npages; i++) | |
561 | put_page(pages[i]); | |
562 | } | |
563 | ||
564 | static | |
565 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
566 | unsigned int npages) | |
567 | { | |
56e4ebf8 BS |
568 | nfs_readdir_free_pagearray(pages, npages); |
569 | } | |
570 | ||
571 | /* | |
572 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
573 | * to nfs_readdir_free_large_page | |
574 | */ | |
575 | static | |
6650239a | 576 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 577 | { |
56e4ebf8 BS |
578 | unsigned int i; |
579 | ||
580 | for (i = 0; i < npages; i++) { | |
581 | struct page *page = alloc_page(GFP_KERNEL); | |
582 | if (page == NULL) | |
583 | goto out_freepages; | |
584 | pages[i] = page; | |
585 | } | |
6650239a | 586 | return 0; |
56e4ebf8 | 587 | |
56e4ebf8 BS |
588 | out_freepages: |
589 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 590 | return -ENOMEM; |
1da177e4 LT |
591 | } |
592 | ||
d1bacf9e BS |
593 | static |
594 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 595 | { |
56e4ebf8 BS |
596 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
597 | void *pages_ptr = NULL; | |
d1bacf9e BS |
598 | struct nfs_entry entry; |
599 | struct file *file = desc->file; | |
600 | struct nfs_cache_array *array; | |
8cd51a0c | 601 | int status = -ENOMEM; |
56e4ebf8 | 602 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
603 | |
604 | entry.prev_cookie = 0; | |
0aded708 | 605 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
606 | entry.eof = 0; |
607 | entry.fh = nfs_alloc_fhandle(); | |
608 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 609 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
610 | if (entry.fh == NULL || entry.fattr == NULL) |
611 | goto out; | |
00a92642 | 612 | |
d1bacf9e | 613 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
614 | if (IS_ERR(array)) { |
615 | status = PTR_ERR(array); | |
616 | goto out; | |
617 | } | |
d1bacf9e BS |
618 | memset(array, 0, sizeof(struct nfs_cache_array)); |
619 | array->eof_index = -1; | |
00a92642 | 620 | |
6650239a TM |
621 | status = nfs_readdir_large_page(pages, array_size); |
622 | if (status < 0) | |
d1bacf9e BS |
623 | goto out_release_array; |
624 | do { | |
ac396128 | 625 | unsigned int pglen; |
56e4ebf8 | 626 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 627 | |
d1bacf9e | 628 | if (status < 0) |
00a92642 | 629 | break; |
ac396128 | 630 | pglen = status; |
6650239a | 631 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
632 | if (status < 0) { |
633 | if (status == -ENOSPC) | |
634 | status = 0; | |
635 | break; | |
636 | } | |
637 | } while (array->eof_index < 0); | |
d1bacf9e | 638 | |
56e4ebf8 | 639 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
640 | out_release_array: |
641 | nfs_readdir_release_array(page); | |
642 | out: | |
643 | nfs_free_fattr(entry.fattr); | |
644 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
645 | return status; |
646 | } | |
647 | ||
648 | /* | |
d1bacf9e BS |
649 | * Now we cache directories properly, by converting xdr information |
650 | * to an array that can be used for lookups later. This results in | |
651 | * fewer cache pages, since we can store more information on each page. | |
652 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 653 | */ |
d1bacf9e BS |
654 | static |
655 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 656 | { |
01cce933 | 657 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 658 | int ret; |
1da177e4 | 659 | |
8cd51a0c TM |
660 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
661 | if (ret < 0) | |
d1bacf9e BS |
662 | goto error; |
663 | SetPageUptodate(page); | |
1da177e4 | 664 | |
d1bacf9e BS |
665 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
666 | /* Should never happen */ | |
667 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 668 | } |
d1bacf9e BS |
669 | unlock_page(page); |
670 | return 0; | |
671 | error: | |
672 | unlock_page(page); | |
8cd51a0c | 673 | return ret; |
d1bacf9e | 674 | } |
1da177e4 | 675 | |
d1bacf9e BS |
676 | static |
677 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
678 | { | |
11de3b11 TM |
679 | if (!desc->page->mapping) |
680 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
681 | page_cache_release(desc->page); |
682 | desc->page = NULL; | |
683 | } | |
684 | ||
685 | static | |
686 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
687 | { | |
8cd51a0c | 688 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 689 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
690 | } |
691 | ||
692 | /* | |
d1bacf9e | 693 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 694 | */ |
d1bacf9e BS |
695 | static |
696 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
697 | { | |
698 | int res; | |
699 | ||
700 | desc->page = get_cache_page(desc); | |
701 | if (IS_ERR(desc->page)) | |
702 | return PTR_ERR(desc->page); | |
703 | ||
704 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
705 | if (res != 0) |
706 | cache_page_release(desc); | |
d1bacf9e BS |
707 | return res; |
708 | } | |
709 | ||
710 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
711 | static inline |
712 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
713 | { | |
8cd51a0c | 714 | int res; |
d1bacf9e | 715 | |
0aded708 | 716 | if (desc->page_index == 0) { |
8cd51a0c | 717 | desc->current_index = 0; |
0aded708 TM |
718 | desc->last_cookie = 0; |
719 | } | |
47c716cb | 720 | do { |
d1bacf9e | 721 | res = find_cache_page(desc); |
47c716cb | 722 | } while (res == -EAGAIN); |
1da177e4 LT |
723 | return res; |
724 | } | |
725 | ||
1da177e4 LT |
726 | /* |
727 | * Once we've found the start of the dirent within a page: fill 'er up... | |
728 | */ | |
729 | static | |
730 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
731 | filldir_t filldir) | |
732 | { | |
733 | struct file *file = desc->file; | |
d1bacf9e BS |
734 | int i = 0; |
735 | int res = 0; | |
736 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
737 | struct nfs_open_dir_context *ctx = file->private_data; |
738 | ||
d1bacf9e | 739 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
740 | if (IS_ERR(array)) { |
741 | res = PTR_ERR(array); | |
742 | goto out; | |
743 | } | |
d1bacf9e BS |
744 | |
745 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 746 | struct nfs_cache_array_entry *ent; |
1da177e4 | 747 | |
ece0b423 TM |
748 | ent = &array->array[i]; |
749 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
750 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
751 | ent->d_type) < 0) { | |
ece0b423 | 752 | desc->eof = 1; |
1da177e4 | 753 | break; |
ece0b423 | 754 | } |
00a92642 | 755 | file->f_pos++; |
d1bacf9e BS |
756 | if (i < (array->size-1)) |
757 | *desc->dir_cookie = array->array[i+1].cookie; | |
758 | else | |
759 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
760 | if (ctx->duped != 0) |
761 | ctx->duped = 1; | |
1da177e4 | 762 | } |
47c716cb | 763 | if (array->eof_index >= 0) |
8cd51a0c | 764 | desc->eof = 1; |
d1bacf9e BS |
765 | |
766 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 767 | out: |
d1bacf9e | 768 | cache_page_release(desc); |
1e7cb3dc CL |
769 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
770 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
771 | return res; |
772 | } | |
773 | ||
774 | /* | |
775 | * If we cannot find a cookie in our cache, we suspect that this is | |
776 | * because it points to a deleted file, so we ask the server to return | |
777 | * whatever it thinks is the next entry. We then feed this to filldir. | |
778 | * If all goes well, we should then be able to find our way round the | |
779 | * cache on the next call to readdir_search_pagecache(); | |
780 | * | |
781 | * NOTE: we cannot add the anonymous page to the pagecache because | |
782 | * the data it contains might not be page aligned. Besides, | |
783 | * we should already have a complete representation of the | |
784 | * directory in the page cache by the time we get here. | |
785 | */ | |
786 | static inline | |
787 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
788 | filldir_t filldir) | |
789 | { | |
1da177e4 LT |
790 | struct page *page = NULL; |
791 | int status; | |
d1bacf9e | 792 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
0c030806 | 793 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 794 | |
1e7cb3dc CL |
795 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
796 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
797 | |
798 | page = alloc_page(GFP_HIGHUSER); | |
799 | if (!page) { | |
800 | status = -ENOMEM; | |
801 | goto out; | |
802 | } | |
d1bacf9e | 803 | |
7a8e1dc3 | 804 | desc->page_index = 0; |
0aded708 | 805 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 806 | desc->page = page; |
0c030806 | 807 | ctx->duped = 0; |
7a8e1dc3 | 808 | |
85f8607e TM |
809 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
810 | if (status < 0) | |
1da177e4 LT |
811 | goto out_release; |
812 | ||
813 | status = nfs_do_filldir(desc, dirent, filldir); | |
814 | ||
1da177e4 | 815 | out: |
1e7cb3dc | 816 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 817 | __func__, status); |
1da177e4 LT |
818 | return status; |
819 | out_release: | |
d1bacf9e | 820 | cache_page_release(desc); |
1da177e4 LT |
821 | goto out; |
822 | } | |
823 | ||
00a92642 OG |
824 | /* The file offset position represents the dirent entry number. A |
825 | last cookie cache takes care of the common case of reading the | |
826 | whole directory. | |
1da177e4 LT |
827 | */ |
828 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
829 | { | |
01cce933 | 830 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
831 | struct inode *inode = dentry->d_inode; |
832 | nfs_readdir_descriptor_t my_desc, | |
833 | *desc = &my_desc; | |
480c2006 | 834 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 835 | int res; |
1da177e4 | 836 | |
6da24bc9 | 837 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
838 | dentry->d_parent->d_name.name, dentry->d_name.name, |
839 | (long long)filp->f_pos); | |
91d5b470 CL |
840 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
841 | ||
1da177e4 | 842 | /* |
00a92642 | 843 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 844 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
845 | * to either find the entry with the appropriate number or |
846 | * revalidate the cookie. | |
1da177e4 LT |
847 | */ |
848 | memset(desc, 0, sizeof(*desc)); | |
849 | ||
850 | desc->file = filp; | |
480c2006 | 851 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 852 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
d69ee9b8 | 853 | desc->plus = nfs_use_readdirplus(inode, filp) ? 1 : 0; |
1da177e4 | 854 | |
565277f6 | 855 | nfs_block_sillyrename(dentry); |
1cda707d | 856 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
857 | if (res < 0) |
858 | goto out; | |
859 | ||
47c716cb | 860 | do { |
1da177e4 | 861 | res = readdir_search_pagecache(desc); |
00a92642 | 862 | |
1da177e4 | 863 | if (res == -EBADCOOKIE) { |
ece0b423 | 864 | res = 0; |
1da177e4 | 865 | /* This means either end of directory */ |
d1bacf9e | 866 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
867 | /* Or that the server has 'lost' a cookie */ |
868 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 869 | if (res == 0) |
1da177e4 LT |
870 | continue; |
871 | } | |
1da177e4 LT |
872 | break; |
873 | } | |
874 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 875 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 876 | nfs_zap_caches(inode); |
baf57a09 | 877 | desc->page_index = 0; |
1da177e4 | 878 | desc->plus = 0; |
d1bacf9e | 879 | desc->eof = 0; |
1da177e4 LT |
880 | continue; |
881 | } | |
882 | if (res < 0) | |
883 | break; | |
884 | ||
885 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 886 | if (res < 0) |
1da177e4 | 887 | break; |
47c716cb | 888 | } while (!desc->eof); |
fccca7fc | 889 | out: |
565277f6 | 890 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
891 | if (res > 0) |
892 | res = 0; | |
aa49b4cf | 893 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
894 | dentry->d_parent->d_name.name, dentry->d_name.name, |
895 | res); | |
896 | return res; | |
1da177e4 LT |
897 | } |
898 | ||
10afec90 | 899 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 900 | { |
b84e06c5 CL |
901 | struct dentry *dentry = filp->f_path.dentry; |
902 | struct inode *inode = dentry->d_inode; | |
480c2006 | 903 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 904 | |
6da24bc9 | 905 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
906 | dentry->d_parent->d_name.name, |
907 | dentry->d_name.name, | |
908 | offset, origin); | |
909 | ||
910 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
911 | switch (origin) { |
912 | case 1: | |
913 | offset += filp->f_pos; | |
914 | case 0: | |
915 | if (offset >= 0) | |
916 | break; | |
917 | default: | |
918 | offset = -EINVAL; | |
919 | goto out; | |
920 | } | |
921 | if (offset != filp->f_pos) { | |
922 | filp->f_pos = offset; | |
480c2006 | 923 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 924 | dir_ctx->duped = 0; |
f0dd2136 TM |
925 | } |
926 | out: | |
b84e06c5 | 927 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
928 | return offset; |
929 | } | |
930 | ||
1da177e4 LT |
931 | /* |
932 | * All directory operations under NFS are synchronous, so fsync() | |
933 | * is a dummy operation. | |
934 | */ | |
02c24a82 JB |
935 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
936 | int datasync) | |
1da177e4 | 937 | { |
7ea80859 | 938 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 939 | struct inode *inode = dentry->d_inode; |
7ea80859 | 940 | |
6da24bc9 | 941 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
942 | dentry->d_parent->d_name.name, dentry->d_name.name, |
943 | datasync); | |
944 | ||
02c24a82 | 945 | mutex_lock(&inode->i_mutex); |
54917786 | 946 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 947 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
948 | return 0; |
949 | } | |
950 | ||
bfc69a45 TM |
951 | /** |
952 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
953 | * @dir - pointer to directory inode | |
954 | * | |
955 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
956 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
957 | * on the server that might have invalidated our dcache. | |
958 | * | |
959 | * The caller should be holding dir->i_lock | |
960 | */ | |
961 | void nfs_force_lookup_revalidate(struct inode *dir) | |
962 | { | |
011935a0 | 963 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
964 | } |
965 | ||
1da177e4 LT |
966 | /* |
967 | * A check for whether or not the parent directory has changed. | |
968 | * In the case it has, we assume that the dentries are untrustworthy | |
969 | * and may need to be looked up again. | |
970 | */ | |
c79ba787 | 971 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
972 | { |
973 | if (IS_ROOT(dentry)) | |
974 | return 1; | |
4eec952e TM |
975 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
976 | return 0; | |
f2c77f4e TM |
977 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
978 | return 0; | |
979 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
980 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
981 | return 0; | |
982 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
983 | return 0; | |
984 | return 1; | |
1da177e4 LT |
985 | } |
986 | ||
a12802ca TM |
987 | /* |
988 | * Use intent information to check whether or not we're going to do | |
989 | * an O_EXCL create using this path component. | |
990 | */ | |
fa3c56bb | 991 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
992 | { |
993 | if (NFS_PROTO(dir)->version == 2) | |
994 | return 0; | |
fa3c56bb | 995 | return flags & LOOKUP_EXCL; |
a12802ca TM |
996 | } |
997 | ||
1d6757fb TM |
998 | /* |
999 | * Inode and filehandle revalidation for lookups. | |
1000 | * | |
1001 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1002 | * or if the intent information indicates that we're about to open this | |
1003 | * particular file and the "nocto" mount flag is not set. | |
1004 | * | |
1005 | */ | |
1da177e4 | 1006 | static inline |
fa3c56bb | 1007 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1008 | { |
1009 | struct nfs_server *server = NFS_SERVER(inode); | |
1010 | ||
36d43a43 | 1011 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1012 | return 0; |
facc3530 | 1013 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1014 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1015 | goto out_force; |
1016 | /* This is an open(2) */ | |
fa3c56bb AV |
1017 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1018 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 AV |
1019 | goto out_force; |
1020 | return 0; | |
1da177e4 LT |
1021 | out_force: |
1022 | return __nfs_revalidate_inode(server, inode); | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * We judge how long we want to trust negative | |
1027 | * dentries by looking at the parent inode mtime. | |
1028 | * | |
1029 | * If parent mtime has changed, we revalidate, else we wait for a | |
1030 | * period corresponding to the parent's attribute cache timeout value. | |
1031 | */ | |
1032 | static inline | |
1033 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1034 | unsigned int flags) |
1da177e4 | 1035 | { |
1da177e4 | 1036 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1037 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1038 | return 0; |
4eec952e TM |
1039 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1040 | return 1; | |
1da177e4 LT |
1041 | return !nfs_check_verifier(dir, dentry); |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * This is called every time the dcache has a lookup hit, | |
1046 | * and we should check whether we can really trust that | |
1047 | * lookup. | |
1048 | * | |
1049 | * NOTE! The hit can be a negative hit too, don't assume | |
1050 | * we have an inode! | |
1051 | * | |
1052 | * If the parent directory is seen to have changed, we throw out the | |
1053 | * cached dentry and do a new lookup. | |
1054 | */ | |
0b728e19 | 1055 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1056 | { |
1057 | struct inode *dir; | |
1058 | struct inode *inode; | |
1059 | struct dentry *parent; | |
e1fb4d05 TM |
1060 | struct nfs_fh *fhandle = NULL; |
1061 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1062 | int error; |
1da177e4 | 1063 | |
fa3c56bb | 1064 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1065 | return -ECHILD; |
1066 | ||
1da177e4 | 1067 | parent = dget_parent(dentry); |
1da177e4 | 1068 | dir = parent->d_inode; |
91d5b470 | 1069 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1070 | inode = dentry->d_inode; |
1071 | ||
1072 | if (!inode) { | |
fa3c56bb | 1073 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1074 | goto out_bad; |
d69ee9b8 | 1075 | goto out_valid_noent; |
1da177e4 LT |
1076 | } |
1077 | ||
1078 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1079 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1080 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1081 | dentry->d_name.name); |
1da177e4 LT |
1082 | goto out_bad; |
1083 | } | |
1084 | ||
011e2a7f | 1085 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1086 | goto out_set_verifier; |
1087 | ||
1da177e4 | 1088 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1089 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1090 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1091 | goto out_zap_parent; |
1092 | goto out_valid; | |
1093 | } | |
1094 | ||
1095 | if (NFS_STALE(inode)) | |
1096 | goto out_bad; | |
1097 | ||
e1fb4d05 TM |
1098 | error = -ENOMEM; |
1099 | fhandle = nfs_alloc_fhandle(); | |
1100 | fattr = nfs_alloc_fattr(); | |
1101 | if (fhandle == NULL || fattr == NULL) | |
1102 | goto out_error; | |
1103 | ||
80a16b21 | 1104 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1105 | if (error) |
1106 | goto out_bad; | |
e1fb4d05 | 1107 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1108 | goto out_bad; |
e1fb4d05 | 1109 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1110 | goto out_bad; |
1111 | ||
e1fb4d05 TM |
1112 | nfs_free_fattr(fattr); |
1113 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1114 | out_set_verifier: |
cf8ba45e | 1115 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1116 | out_valid: |
d69ee9b8 TM |
1117 | /* Success: notify readdir to use READDIRPLUS */ |
1118 | nfs_advise_use_readdirplus(dir); | |
1119 | out_valid_noent: | |
1da177e4 | 1120 | dput(parent); |
1e7cb3dc | 1121 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1122 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1123 | dentry->d_name.name); |
1da177e4 LT |
1124 | return 1; |
1125 | out_zap_parent: | |
1126 | nfs_zap_caches(dir); | |
1127 | out_bad: | |
a1643a92 | 1128 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1129 | if (inode && S_ISDIR(inode->i_mode)) { |
1130 | /* Purge readdir caches. */ | |
1131 | nfs_zap_caches(inode); | |
1132 | /* If we have submounts, don't unhash ! */ | |
1133 | if (have_submounts(dentry)) | |
1134 | goto out_valid; | |
d9e80b7d AV |
1135 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1136 | goto out_valid; | |
1da177e4 LT |
1137 | shrink_dcache_parent(dentry); |
1138 | } | |
1139 | d_drop(dentry); | |
e1fb4d05 TM |
1140 | nfs_free_fattr(fattr); |
1141 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1142 | dput(parent); |
1e7cb3dc | 1143 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1144 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1145 | dentry->d_name.name); |
1da177e4 | 1146 | return 0; |
e1fb4d05 TM |
1147 | out_error: |
1148 | nfs_free_fattr(fattr); | |
1149 | nfs_free_fhandle(fhandle); | |
1150 | dput(parent); | |
1151 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1152 | __func__, dentry->d_parent->d_name.name, | |
1153 | dentry->d_name.name, error); | |
1154 | return error; | |
1da177e4 LT |
1155 | } |
1156 | ||
1157 | /* | |
1158 | * This is called from dput() when d_count is going to 0. | |
1159 | */ | |
fe15ce44 | 1160 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1161 | { |
1162 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1163 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1164 | dentry->d_flags); | |
1165 | ||
77f11192 TM |
1166 | /* Unhash any dentry with a stale inode */ |
1167 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1168 | return 1; | |
1169 | ||
1da177e4 LT |
1170 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1171 | /* Unhash it, so that ->d_iput() would be called */ | |
1172 | return 1; | |
1173 | } | |
1174 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1175 | /* Unhash it, so that ancestors of killed async unlink | |
1176 | * files will be cleaned up during umount */ | |
1177 | return 1; | |
1178 | } | |
1179 | return 0; | |
1180 | ||
1181 | } | |
1182 | ||
1b83d707 TM |
1183 | static void nfs_drop_nlink(struct inode *inode) |
1184 | { | |
1185 | spin_lock(&inode->i_lock); | |
1186 | if (inode->i_nlink > 0) | |
1187 | drop_nlink(inode); | |
1188 | spin_unlock(&inode->i_lock); | |
1189 | } | |
1190 | ||
1da177e4 LT |
1191 | /* |
1192 | * Called when the dentry loses inode. | |
1193 | * We use it to clean up silly-renamed files. | |
1194 | */ | |
1195 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1196 | { | |
83672d39 NB |
1197 | if (S_ISDIR(inode->i_mode)) |
1198 | /* drop any readdir cache as it could easily be old */ | |
1199 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1200 | ||
1da177e4 | 1201 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1202 | drop_nlink(inode); |
e4eff1a6 | 1203 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1204 | } |
1da177e4 LT |
1205 | iput(inode); |
1206 | } | |
1207 | ||
b1942c5f AV |
1208 | static void nfs_d_release(struct dentry *dentry) |
1209 | { | |
1210 | /* free cached devname value, if it survived that far */ | |
1211 | if (unlikely(dentry->d_fsdata)) { | |
1212 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1213 | WARN_ON(1); | |
1214 | else | |
1215 | kfree(dentry->d_fsdata); | |
1216 | } | |
1217 | } | |
1218 | ||
f786aa90 | 1219 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1220 | .d_revalidate = nfs_lookup_revalidate, |
1221 | .d_delete = nfs_dentry_delete, | |
1222 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1223 | .d_automount = nfs_d_automount, |
b1942c5f | 1224 | .d_release = nfs_d_release, |
1da177e4 LT |
1225 | }; |
1226 | ||
597d9289 | 1227 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1228 | { |
1229 | struct dentry *res; | |
565277f6 | 1230 | struct dentry *parent; |
1da177e4 | 1231 | struct inode *inode = NULL; |
e1fb4d05 TM |
1232 | struct nfs_fh *fhandle = NULL; |
1233 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1234 | int error; |
1da177e4 LT |
1235 | |
1236 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1237 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1238 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1239 | |
1240 | res = ERR_PTR(-ENAMETOOLONG); | |
1241 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1242 | goto out; | |
1243 | ||
fd684071 TM |
1244 | /* |
1245 | * If we're doing an exclusive create, optimize away the lookup | |
1246 | * but don't hash the dentry. | |
1247 | */ | |
00cd8dd3 | 1248 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1249 | d_instantiate(dentry, NULL); |
1250 | res = NULL; | |
fc0f684c | 1251 | goto out; |
fd684071 | 1252 | } |
1da177e4 | 1253 | |
e1fb4d05 TM |
1254 | res = ERR_PTR(-ENOMEM); |
1255 | fhandle = nfs_alloc_fhandle(); | |
1256 | fattr = nfs_alloc_fattr(); | |
1257 | if (fhandle == NULL || fattr == NULL) | |
1258 | goto out; | |
1259 | ||
565277f6 TM |
1260 | parent = dentry->d_parent; |
1261 | /* Protect against concurrent sillydeletes */ | |
1262 | nfs_block_sillyrename(parent); | |
80a16b21 | 1263 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1264 | if (error == -ENOENT) |
1265 | goto no_entry; | |
1266 | if (error < 0) { | |
1267 | res = ERR_PTR(error); | |
565277f6 | 1268 | goto out_unblock_sillyrename; |
1da177e4 | 1269 | } |
e1fb4d05 | 1270 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1271 | res = ERR_CAST(inode); |
03f28e3a | 1272 | if (IS_ERR(res)) |
565277f6 | 1273 | goto out_unblock_sillyrename; |
54ceac45 | 1274 | |
d69ee9b8 TM |
1275 | /* Success: notify readdir to use READDIRPLUS */ |
1276 | nfs_advise_use_readdirplus(dir); | |
1277 | ||
1da177e4 | 1278 | no_entry: |
54ceac45 | 1279 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1280 | if (res != NULL) { |
1281 | if (IS_ERR(res)) | |
565277f6 | 1282 | goto out_unblock_sillyrename; |
1da177e4 | 1283 | dentry = res; |
9eaef27b | 1284 | } |
1da177e4 | 1285 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1286 | out_unblock_sillyrename: |
1287 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1288 | out: |
e1fb4d05 TM |
1289 | nfs_free_fattr(fattr); |
1290 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1291 | return res; |
1292 | } | |
1293 | ||
1294 | #ifdef CONFIG_NFS_V4 | |
0b728e19 | 1295 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1296 | |
f786aa90 | 1297 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1298 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1299 | .d_delete = nfs_dentry_delete, |
1300 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1301 | .d_automount = nfs_d_automount, |
b1942c5f | 1302 | .d_release = nfs_d_release, |
1da177e4 LT |
1303 | }; |
1304 | ||
8a5e929d AV |
1305 | static fmode_t flags_to_mode(int flags) |
1306 | { | |
1307 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1308 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1309 | res |= FMODE_READ; | |
1310 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1311 | res |= FMODE_WRITE; | |
1312 | return res; | |
1313 | } | |
1314 | ||
51141598 | 1315 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1316 | { |
5ede7b1c | 1317 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1318 | } |
1319 | ||
1320 | static int do_open(struct inode *inode, struct file *filp) | |
1321 | { | |
1322 | nfs_fscache_set_inode_cookie(inode, filp); | |
1323 | return 0; | |
1324 | } | |
1325 | ||
d9585277 AV |
1326 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1327 | struct dentry *dentry, | |
30d90494 | 1328 | struct file *file, unsigned open_flags, |
d9585277 | 1329 | int *opened) |
cd9a1c0e | 1330 | { |
0dd2b474 MS |
1331 | int err; |
1332 | ||
1333 | if (ctx->dentry != dentry) { | |
1334 | dput(ctx->dentry); | |
1335 | ctx->dentry = dget(dentry); | |
1336 | } | |
cd9a1c0e TM |
1337 | |
1338 | /* If the open_intent is for execute, we have an extra check to make */ | |
1339 | if (ctx->mode & FMODE_EXEC) { | |
0dd2b474 | 1340 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
d9585277 | 1341 | if (err < 0) |
cd9a1c0e TM |
1342 | goto out; |
1343 | } | |
0dd2b474 | 1344 | |
30d90494 AV |
1345 | err = finish_open(file, dentry, do_open, opened); |
1346 | if (err) | |
d9585277 | 1347 | goto out; |
30d90494 | 1348 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1349 | |
cd9a1c0e TM |
1350 | out: |
1351 | put_nfs_open_context(ctx); | |
d9585277 | 1352 | return err; |
cd9a1c0e TM |
1353 | } |
1354 | ||
d9585277 | 1355 | static int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 1356 | struct file *file, unsigned open_flags, |
d9585277 | 1357 | umode_t mode, int *opened) |
1da177e4 | 1358 | { |
cd9a1c0e | 1359 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1360 | struct dentry *res; |
1361 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1362 | struct inode *inode; |
898f635c | 1363 | int err; |
1da177e4 | 1364 | |
0dd2b474 MS |
1365 | /* Expect a negative dentry */ |
1366 | BUG_ON(dentry->d_inode); | |
1367 | ||
1368 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1369 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1370 | ||
0dd2b474 MS |
1371 | /* NFS only supports OPEN on regular files */ |
1372 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1373 | if (!d_unhashed(dentry)) { |
1374 | /* | |
1375 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1376 | * revalidated and is fine, no need to perform lookup | |
1377 | * again | |
1378 | */ | |
d9585277 | 1379 | return -ENOENT; |
0dd2b474 | 1380 | } |
1da177e4 | 1381 | goto no_open; |
02a913a7 | 1382 | } |
1da177e4 | 1383 | |
0dd2b474 | 1384 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1385 | return -ENAMETOOLONG; |
cd9a1c0e | 1386 | |
0dd2b474 | 1387 | if (open_flags & O_CREAT) { |
536e43d1 | 1388 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1389 | attr.ia_mode = mode & ~current_umask(); |
1390 | } | |
536e43d1 TM |
1391 | if (open_flags & O_TRUNC) { |
1392 | attr.ia_valid |= ATTR_SIZE; | |
1393 | attr.ia_size = 0; | |
cd9a1c0e TM |
1394 | } |
1395 | ||
0dd2b474 MS |
1396 | ctx = create_nfs_open_context(dentry, open_flags); |
1397 | err = PTR_ERR(ctx); | |
1398 | if (IS_ERR(ctx)) | |
d9585277 | 1399 | goto out; |
0dd2b474 | 1400 | |
f46e0bd3 | 1401 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1402 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
0dd2b474 | 1403 | d_drop(dentry); |
f46e0bd3 TM |
1404 | if (IS_ERR(inode)) { |
1405 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1406 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1407 | err = PTR_ERR(inode); |
1408 | switch (err) { | |
1409 | case -ENOENT: | |
1410 | d_add(dentry, NULL); | |
1411 | break; | |
1412 | case -EISDIR: | |
1413 | case -ENOTDIR: | |
1414 | goto no_open; | |
1415 | case -ELOOP: | |
1416 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1417 | goto no_open; |
0dd2b474 | 1418 | break; |
1da177e4 | 1419 | /* case -EINVAL: */ |
0dd2b474 MS |
1420 | default: |
1421 | break; | |
1da177e4 | 1422 | } |
d9585277 | 1423 | goto out; |
cd9a1c0e | 1424 | } |
f46e0bd3 | 1425 | res = d_add_unique(dentry, inode); |
0dd2b474 | 1426 | if (res != NULL) |
1da177e4 | 1427 | dentry = res; |
0dd2b474 MS |
1428 | |
1429 | nfs_unblock_sillyrename(dentry->d_parent); | |
f46e0bd3 | 1430 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 | 1431 | |
30d90494 | 1432 | err = nfs_finish_open(ctx, dentry, file, open_flags, opened); |
0dd2b474 MS |
1433 | |
1434 | dput(res); | |
d9585277 AV |
1435 | out: |
1436 | return err; | |
0dd2b474 | 1437 | |
1da177e4 | 1438 | no_open: |
00cd8dd3 | 1439 | res = nfs_lookup(dir, dentry, 0); |
0dd2b474 MS |
1440 | err = PTR_ERR(res); |
1441 | if (IS_ERR(res)) | |
d9585277 | 1442 | goto out; |
0dd2b474 | 1443 | |
e45198a6 | 1444 | return finish_no_open(file, res); |
1da177e4 LT |
1445 | } |
1446 | ||
0b728e19 | 1447 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1448 | { |
1449 | struct dentry *parent = NULL; | |
657e94b6 | 1450 | struct inode *inode; |
1da177e4 | 1451 | struct inode *dir; |
50de348c | 1452 | int ret = 0; |
1da177e4 | 1453 | |
fa3c56bb | 1454 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1455 | return -ECHILD; |
1456 | ||
fa3c56bb | 1457 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1458 | goto no_open; |
1459 | if (d_mountpoint(dentry)) | |
5584c306 | 1460 | goto no_open; |
2b484297 | 1461 | |
eda72afb | 1462 | inode = dentry->d_inode; |
1da177e4 LT |
1463 | parent = dget_parent(dentry); |
1464 | dir = parent->d_inode; | |
2b484297 | 1465 | |
1da177e4 LT |
1466 | /* We can't create new files in nfs_open_revalidate(), so we |
1467 | * optimize away revalidation of negative dentries. | |
1468 | */ | |
216d5d06 | 1469 | if (inode == NULL) { |
fa3c56bb | 1470 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1471 | ret = 1; |
1da177e4 | 1472 | goto out; |
216d5d06 TM |
1473 | } |
1474 | ||
1da177e4 LT |
1475 | /* NFS only supports OPEN on regular files */ |
1476 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1477 | goto no_open_dput; |
1da177e4 | 1478 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1479 | if (flags & LOOKUP_EXCL) |
5584c306 | 1480 | goto no_open_dput; |
1da177e4 | 1481 | |
0ef97dcf MS |
1482 | /* Let f_op->open() actually open (and revalidate) the file */ |
1483 | ret = 1; | |
536e43d1 | 1484 | |
1da177e4 LT |
1485 | out: |
1486 | dput(parent); | |
1da177e4 | 1487 | return ret; |
535918f1 | 1488 | |
5584c306 | 1489 | no_open_dput: |
1da177e4 | 1490 | dput(parent); |
5584c306 | 1491 | no_open: |
0b728e19 | 1492 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1493 | } |
1494 | ||
1da177e4 LT |
1495 | #endif /* CONFIG_NFSV4 */ |
1496 | ||
1da177e4 LT |
1497 | /* |
1498 | * Code common to create, mkdir, and mknod. | |
1499 | */ | |
1500 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1501 | struct nfs_fattr *fattr) | |
1502 | { | |
fab728e1 TM |
1503 | struct dentry *parent = dget_parent(dentry); |
1504 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1505 | struct inode *inode; |
1506 | int error = -EACCES; | |
1507 | ||
fab728e1 TM |
1508 | d_drop(dentry); |
1509 | ||
1da177e4 LT |
1510 | /* We may have been initialized further down */ |
1511 | if (dentry->d_inode) | |
fab728e1 | 1512 | goto out; |
1da177e4 | 1513 | if (fhandle->size == 0) { |
80a16b21 | 1514 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1515 | if (error) |
fab728e1 | 1516 | goto out_error; |
1da177e4 | 1517 | } |
5724ab37 | 1518 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1519 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1520 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1521 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1522 | if (error < 0) |
fab728e1 | 1523 | goto out_error; |
1da177e4 | 1524 | } |
1da177e4 | 1525 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1526 | error = PTR_ERR(inode); |
1527 | if (IS_ERR(inode)) | |
fab728e1 TM |
1528 | goto out_error; |
1529 | d_add(dentry, inode); | |
1530 | out: | |
1531 | dput(parent); | |
1da177e4 | 1532 | return 0; |
fab728e1 TM |
1533 | out_error: |
1534 | nfs_mark_for_revalidate(dir); | |
1535 | dput(parent); | |
1536 | return error; | |
1da177e4 LT |
1537 | } |
1538 | ||
1539 | /* | |
1540 | * Following a failed create operation, we drop the dentry rather | |
1541 | * than retain a negative dentry. This avoids a problem in the event | |
1542 | * that the operation succeeded on the server, but an error in the | |
1543 | * reply path made it appear to have failed. | |
1544 | */ | |
597d9289 | 1545 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1546 | umode_t mode, bool excl) |
1da177e4 LT |
1547 | { |
1548 | struct iattr attr; | |
ebfc3b49 | 1549 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1550 | int error; |
1da177e4 | 1551 | |
1e7cb3dc CL |
1552 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1553 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1554 | |
1555 | attr.ia_mode = mode; | |
1556 | attr.ia_valid = ATTR_MODE; | |
1557 | ||
8867fe58 | 1558 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1559 | if (error != 0) |
1560 | goto out_err; | |
1da177e4 LT |
1561 | return 0; |
1562 | out_err: | |
1da177e4 LT |
1563 | d_drop(dentry); |
1564 | return error; | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * See comments for nfs_proc_create regarding failed operations. | |
1569 | */ | |
597d9289 | 1570 | int |
1a67aafb | 1571 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1572 | { |
1573 | struct iattr attr; | |
1574 | int status; | |
1575 | ||
1e7cb3dc CL |
1576 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1577 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1578 | |
1579 | if (!new_valid_dev(rdev)) | |
1580 | return -EINVAL; | |
1581 | ||
1582 | attr.ia_mode = mode; | |
1583 | attr.ia_valid = ATTR_MODE; | |
1584 | ||
1da177e4 | 1585 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1586 | if (status != 0) |
1587 | goto out_err; | |
1da177e4 LT |
1588 | return 0; |
1589 | out_err: | |
1da177e4 LT |
1590 | d_drop(dentry); |
1591 | return status; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * See comments for nfs_proc_create regarding failed operations. | |
1596 | */ | |
597d9289 | 1597 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1598 | { |
1599 | struct iattr attr; | |
1600 | int error; | |
1601 | ||
1e7cb3dc CL |
1602 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1603 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1604 | |
1605 | attr.ia_valid = ATTR_MODE; | |
1606 | attr.ia_mode = mode | S_IFDIR; | |
1607 | ||
1da177e4 | 1608 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1609 | if (error != 0) |
1610 | goto out_err; | |
1da177e4 LT |
1611 | return 0; |
1612 | out_err: | |
1613 | d_drop(dentry); | |
1da177e4 LT |
1614 | return error; |
1615 | } | |
1616 | ||
d45b9d8b TM |
1617 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1618 | { | |
1619 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1620 | d_delete(dentry); | |
1621 | } | |
1622 | ||
597d9289 | 1623 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1624 | { |
1625 | int error; | |
1626 | ||
1e7cb3dc CL |
1627 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1628 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1629 | |
1da177e4 LT |
1630 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1631 | /* Ensure the VFS deletes this inode */ | |
1632 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1633 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1634 | else if (error == -ENOENT) |
1635 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1636 | |
1637 | return error; | |
1638 | } | |
1639 | ||
1da177e4 LT |
1640 | /* |
1641 | * Remove a file after making sure there are no pending writes, | |
1642 | * and after checking that the file has only one user. | |
1643 | * | |
1644 | * We invalidate the attribute cache and free the inode prior to the operation | |
1645 | * to avoid possible races if the server reuses the inode. | |
1646 | */ | |
1647 | static int nfs_safe_remove(struct dentry *dentry) | |
1648 | { | |
1649 | struct inode *dir = dentry->d_parent->d_inode; | |
1650 | struct inode *inode = dentry->d_inode; | |
1651 | int error = -EBUSY; | |
1652 | ||
1653 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1654 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1655 | ||
1656 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1657 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1658 | error = 0; | |
1659 | goto out; | |
1660 | } | |
1661 | ||
1da177e4 | 1662 | if (inode != NULL) { |
57ec14c5 | 1663 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 LT |
1664 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1665 | /* The VFS may want to delete this inode */ | |
1666 | if (error == 0) | |
1b83d707 | 1667 | nfs_drop_nlink(inode); |
5ba7cc48 | 1668 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1669 | } else |
1670 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1671 | if (error == -ENOENT) |
1672 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1673 | out: |
1674 | return error; | |
1675 | } | |
1676 | ||
1677 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1678 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1679 | * | |
1680 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1681 | */ | |
597d9289 | 1682 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1683 | { |
1684 | int error; | |
1685 | int need_rehash = 0; | |
1686 | ||
1687 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1688 | dir->i_ino, dentry->d_name.name); | |
1689 | ||
1da177e4 | 1690 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1691 | if (dentry->d_count > 1) { |
1da177e4 | 1692 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1693 | /* Start asynchronous writeout of the inode */ |
1694 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1695 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1696 | return error; |
1697 | } | |
1698 | if (!d_unhashed(dentry)) { | |
1699 | __d_drop(dentry); | |
1700 | need_rehash = 1; | |
1701 | } | |
1702 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1703 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1704 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1705 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1706 | } else if (need_rehash) | |
1707 | d_rehash(dentry); | |
1da177e4 LT |
1708 | return error; |
1709 | } | |
1710 | ||
873101b3 CL |
1711 | /* |
1712 | * To create a symbolic link, most file systems instantiate a new inode, | |
1713 | * add a page to it containing the path, then write it out to the disk | |
1714 | * using prepare_write/commit_write. | |
1715 | * | |
1716 | * Unfortunately the NFS client can't create the in-core inode first | |
1717 | * because it needs a file handle to create an in-core inode (see | |
1718 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1719 | * symlink request has completed on the server. | |
1720 | * | |
1721 | * So instead we allocate a raw page, copy the symname into it, then do | |
1722 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1723 | * now have a new file handle and can instantiate an in-core NFS inode | |
1724 | * and move the raw page into its mapping. | |
1725 | */ | |
597d9289 | 1726 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1727 | { |
873101b3 CL |
1728 | struct pagevec lru_pvec; |
1729 | struct page *page; | |
1730 | char *kaddr; | |
1da177e4 | 1731 | struct iattr attr; |
873101b3 | 1732 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1733 | int error; |
1734 | ||
1735 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1736 | dir->i_ino, dentry->d_name.name, symname); | |
1737 | ||
873101b3 CL |
1738 | if (pathlen > PAGE_SIZE) |
1739 | return -ENAMETOOLONG; | |
1da177e4 | 1740 | |
873101b3 CL |
1741 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1742 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1743 | |
83d93f22 | 1744 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1745 | if (!page) |
873101b3 | 1746 | return -ENOMEM; |
873101b3 | 1747 | |
2b86ce2d | 1748 | kaddr = kmap_atomic(page); |
873101b3 CL |
1749 | memcpy(kaddr, symname, pathlen); |
1750 | if (pathlen < PAGE_SIZE) | |
1751 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1752 | kunmap_atomic(kaddr); |
873101b3 | 1753 | |
94a6d753 | 1754 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1755 | if (error != 0) { |
1756 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1757 | dir->i_sb->s_id, dir->i_ino, | |
1758 | dentry->d_name.name, symname, error); | |
1da177e4 | 1759 | d_drop(dentry); |
873101b3 | 1760 | __free_page(page); |
873101b3 CL |
1761 | return error; |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * No big deal if we can't add this page to the page cache here. | |
1766 | * READLINK will get the missing page from the server if needed. | |
1767 | */ | |
1768 | pagevec_init(&lru_pvec, 0); | |
1769 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1770 | GFP_KERNEL)) { | |
39cf8a13 | 1771 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1772 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1773 | SetPageUptodate(page); |
1774 | unlock_page(page); | |
1775 | } else | |
1776 | __free_page(page); | |
1777 | ||
873101b3 | 1778 | return 0; |
1da177e4 LT |
1779 | } |
1780 | ||
597d9289 | 1781 | int |
1da177e4 LT |
1782 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1783 | { | |
1784 | struct inode *inode = old_dentry->d_inode; | |
1785 | int error; | |
1786 | ||
1787 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1788 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1789 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1790 | ||
57ec14c5 | 1791 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1792 | |
9697d234 | 1793 | d_drop(dentry); |
1da177e4 | 1794 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1795 | if (error == 0) { |
7de9c6ee | 1796 | ihold(inode); |
9697d234 | 1797 | d_add(dentry, inode); |
cf809556 | 1798 | } |
1da177e4 LT |
1799 | return error; |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * RENAME | |
1804 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1805 | * different file handle for the same inode after a rename (e.g. when | |
1806 | * moving to a different directory). A fail-safe method to do so would | |
1807 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1808 | * rename the old file using the sillyrename stuff. This way, the original | |
1809 | * file in old_dir will go away when the last process iput()s the inode. | |
1810 | * | |
1811 | * FIXED. | |
1812 | * | |
1813 | * It actually works quite well. One needs to have the possibility for | |
1814 | * at least one ".nfs..." file in each directory the file ever gets | |
1815 | * moved or linked to which happens automagically with the new | |
1816 | * implementation that only depends on the dcache stuff instead of | |
1817 | * using the inode layer | |
1818 | * | |
1819 | * Unfortunately, things are a little more complicated than indicated | |
1820 | * above. For a cross-directory move, we want to make sure we can get | |
1821 | * rid of the old inode after the operation. This means there must be | |
1822 | * no pending writes (if it's a file), and the use count must be 1. | |
1823 | * If these conditions are met, we can drop the dentries before doing | |
1824 | * the rename. | |
1825 | */ | |
597d9289 | 1826 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1827 | struct inode *new_dir, struct dentry *new_dentry) |
1828 | { | |
1829 | struct inode *old_inode = old_dentry->d_inode; | |
1830 | struct inode *new_inode = new_dentry->d_inode; | |
1831 | struct dentry *dentry = NULL, *rehash = NULL; | |
1832 | int error = -EBUSY; | |
1833 | ||
1da177e4 LT |
1834 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1835 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1836 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1837 | new_dentry->d_count); |
1da177e4 LT |
1838 | |
1839 | /* | |
28f79a1a MS |
1840 | * For non-directories, check whether the target is busy and if so, |
1841 | * make a copy of the dentry and then do a silly-rename. If the | |
1842 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1843 | * the new target. | |
1da177e4 | 1844 | */ |
27226104 MS |
1845 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1846 | /* | |
1847 | * To prevent any new references to the target during the | |
1848 | * rename, we unhash the dentry in advance. | |
1849 | */ | |
1850 | if (!d_unhashed(new_dentry)) { | |
1851 | d_drop(new_dentry); | |
1852 | rehash = new_dentry; | |
1853 | } | |
1da177e4 | 1854 | |
b7ab39f6 | 1855 | if (new_dentry->d_count > 2) { |
27226104 MS |
1856 | int err; |
1857 | ||
1858 | /* copy the target dentry's name */ | |
1859 | dentry = d_alloc(new_dentry->d_parent, | |
1860 | &new_dentry->d_name); | |
1861 | if (!dentry) | |
1862 | goto out; | |
1863 | ||
1864 | /* silly-rename the existing target ... */ | |
1865 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1866 | if (err) |
27226104 | 1867 | goto out; |
24e93025 MS |
1868 | |
1869 | new_dentry = dentry; | |
56335936 | 1870 | rehash = NULL; |
24e93025 | 1871 | new_inode = NULL; |
27226104 | 1872 | } |
b1e4adf4 | 1873 | } |
1da177e4 | 1874 | |
57ec14c5 | 1875 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1876 | if (new_inode != NULL) |
57ec14c5 | 1877 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1878 | |
1da177e4 LT |
1879 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1880 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1881 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1882 | out: |
1883 | if (rehash) | |
1884 | d_rehash(rehash); | |
1885 | if (!error) { | |
b1e4adf4 TM |
1886 | if (new_inode != NULL) |
1887 | nfs_drop_nlink(new_inode); | |
349457cc | 1888 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1889 | nfs_set_verifier(new_dentry, |
1890 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1891 | } else if (error == -ENOENT) |
1892 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1893 | |
1894 | /* new dentry created? */ | |
1895 | if (dentry) | |
1896 | dput(dentry); | |
1da177e4 LT |
1897 | return error; |
1898 | } | |
1899 | ||
cfcea3e8 TM |
1900 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1901 | static LIST_HEAD(nfs_access_lru_list); | |
1902 | static atomic_long_t nfs_access_nr_entries; | |
1903 | ||
1c3c07e9 TM |
1904 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1905 | { | |
1906 | put_rpccred(entry->cred); | |
1907 | kfree(entry); | |
cfcea3e8 TM |
1908 | smp_mb__before_atomic_dec(); |
1909 | atomic_long_dec(&nfs_access_nr_entries); | |
1910 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1911 | } |
1912 | ||
1a81bb8a TM |
1913 | static void nfs_access_free_list(struct list_head *head) |
1914 | { | |
1915 | struct nfs_access_entry *cache; | |
1916 | ||
1917 | while (!list_empty(head)) { | |
1918 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1919 | list_del(&cache->lru); | |
1920 | nfs_access_free_entry(cache); | |
1921 | } | |
1922 | } | |
1923 | ||
1495f230 YH |
1924 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
1925 | struct shrink_control *sc) | |
979df72e TM |
1926 | { |
1927 | LIST_HEAD(head); | |
aa510da5 | 1928 | struct nfs_inode *nfsi, *next; |
979df72e | 1929 | struct nfs_access_entry *cache; |
1495f230 YH |
1930 | int nr_to_scan = sc->nr_to_scan; |
1931 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 1932 | |
61d5eb29 TM |
1933 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1934 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1935 | |
a50f7951 | 1936 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1937 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1938 | struct inode *inode; |
1939 | ||
1940 | if (nr_to_scan-- == 0) | |
1941 | break; | |
9c7e7e23 | 1942 | inode = &nfsi->vfs_inode; |
979df72e TM |
1943 | spin_lock(&inode->i_lock); |
1944 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1945 | goto remove_lru_entry; | |
1946 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1947 | struct nfs_access_entry, lru); | |
1948 | list_move(&cache->lru, &head); | |
1949 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1950 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1951 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1952 | &nfs_access_lru_list); | |
1953 | else { | |
1954 | remove_lru_entry: | |
1955 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1956 | smp_mb__before_clear_bit(); |
979df72e | 1957 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1958 | smp_mb__after_clear_bit(); |
979df72e | 1959 | } |
59844a9b | 1960 | spin_unlock(&inode->i_lock); |
979df72e TM |
1961 | } |
1962 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1963 | nfs_access_free_list(&head); |
979df72e TM |
1964 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1965 | } | |
1966 | ||
1a81bb8a | 1967 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1968 | { |
1c3c07e9 | 1969 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1970 | struct rb_node *n; |
1c3c07e9 TM |
1971 | struct nfs_access_entry *entry; |
1972 | ||
1973 | /* Unhook entries from the cache */ | |
1974 | while ((n = rb_first(root_node)) != NULL) { | |
1975 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1976 | rb_erase(n, root_node); | |
1a81bb8a | 1977 | list_move(&entry->lru, head); |
1c3c07e9 TM |
1978 | } |
1979 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
1980 | } |
1981 | ||
1c3c07e9 | 1982 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1983 | { |
1a81bb8a TM |
1984 | LIST_HEAD(head); |
1985 | ||
1986 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
1987 | return; | |
cfcea3e8 | 1988 | /* Remove from global LRU init */ |
1a81bb8a TM |
1989 | spin_lock(&nfs_access_lru_lock); |
1990 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 1991 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 1992 | |
1c3c07e9 | 1993 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
1994 | __nfs_access_zap_cache(NFS_I(inode), &head); |
1995 | spin_unlock(&inode->i_lock); | |
1996 | spin_unlock(&nfs_access_lru_lock); | |
1997 | nfs_access_free_list(&head); | |
1c3c07e9 | 1998 | } |
1da177e4 | 1999 | |
1c3c07e9 TM |
2000 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2001 | { | |
2002 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2003 | struct nfs_access_entry *entry; | |
2004 | ||
2005 | while (n != NULL) { | |
2006 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2007 | ||
2008 | if (cred < entry->cred) | |
2009 | n = n->rb_left; | |
2010 | else if (cred > entry->cred) | |
2011 | n = n->rb_right; | |
2012 | else | |
2013 | return entry; | |
1da177e4 | 2014 | } |
1c3c07e9 TM |
2015 | return NULL; |
2016 | } | |
2017 | ||
af22f94a | 2018 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2019 | { |
2020 | struct nfs_inode *nfsi = NFS_I(inode); | |
2021 | struct nfs_access_entry *cache; | |
2022 | int err = -ENOENT; | |
2023 | ||
dc59250c | 2024 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2025 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2026 | goto out_zap; | |
2027 | cache = nfs_access_search_rbtree(inode, cred); | |
2028 | if (cache == NULL) | |
2029 | goto out; | |
b4d2314b | 2030 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2031 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2032 | goto out_stale; |
2033 | res->jiffies = cache->jiffies; | |
2034 | res->cred = cache->cred; | |
2035 | res->mask = cache->mask; | |
cfcea3e8 | 2036 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2037 | err = 0; |
2038 | out: | |
2039 | spin_unlock(&inode->i_lock); | |
2040 | return err; | |
2041 | out_stale: | |
2042 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2043 | list_del(&cache->lru); |
1c3c07e9 TM |
2044 | spin_unlock(&inode->i_lock); |
2045 | nfs_access_free_entry(cache); | |
2046 | return -ENOENT; | |
2047 | out_zap: | |
1a81bb8a TM |
2048 | spin_unlock(&inode->i_lock); |
2049 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2050 | return -ENOENT; |
2051 | } | |
2052 | ||
2053 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2054 | { | |
cfcea3e8 TM |
2055 | struct nfs_inode *nfsi = NFS_I(inode); |
2056 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2057 | struct rb_node **p = &root_node->rb_node; |
2058 | struct rb_node *parent = NULL; | |
2059 | struct nfs_access_entry *entry; | |
2060 | ||
2061 | spin_lock(&inode->i_lock); | |
2062 | while (*p != NULL) { | |
2063 | parent = *p; | |
2064 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2065 | ||
2066 | if (set->cred < entry->cred) | |
2067 | p = &parent->rb_left; | |
2068 | else if (set->cred > entry->cred) | |
2069 | p = &parent->rb_right; | |
2070 | else | |
2071 | goto found; | |
2072 | } | |
2073 | rb_link_node(&set->rb_node, parent, p); | |
2074 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2075 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2076 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2077 | return; |
2078 | found: | |
2079 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2080 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2081 | list_del(&entry->lru); | |
1c3c07e9 TM |
2082 | spin_unlock(&inode->i_lock); |
2083 | nfs_access_free_entry(entry); | |
2084 | } | |
2085 | ||
af22f94a | 2086 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2087 | { |
2088 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2089 | if (cache == NULL) | |
2090 | return; | |
2091 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2092 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2093 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2094 | cache->mask = set->mask; |
1c3c07e9 TM |
2095 | |
2096 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2097 | |
2098 | /* Update accounting */ | |
2099 | smp_mb__before_atomic_inc(); | |
2100 | atomic_long_inc(&nfs_access_nr_entries); | |
2101 | smp_mb__after_atomic_inc(); | |
2102 | ||
2103 | /* Add inode to global LRU list */ | |
1a81bb8a | 2104 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2105 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2106 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2107 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2108 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2109 | spin_unlock(&nfs_access_lru_lock); |
2110 | } | |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2114 | { | |
2115 | struct nfs_access_entry cache; | |
2116 | int status; | |
2117 | ||
2118 | status = nfs_access_get_cached(inode, cred, &cache); | |
2119 | if (status == 0) | |
2120 | goto out; | |
2121 | ||
2122 | /* Be clever: ask server to check for all possible rights */ | |
2123 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2124 | cache.cred = cred; | |
2125 | cache.jiffies = jiffies; | |
2126 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2127 | if (status != 0) { |
2128 | if (status == -ESTALE) { | |
2129 | nfs_zap_caches(inode); | |
2130 | if (!S_ISDIR(inode->i_mode)) | |
2131 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2132 | } | |
1da177e4 | 2133 | return status; |
a71ee337 | 2134 | } |
1da177e4 LT |
2135 | nfs_access_add_cache(inode, &cache); |
2136 | out: | |
e6305c43 | 2137 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2138 | return 0; |
2139 | return -EACCES; | |
2140 | } | |
2141 | ||
af22f94a TM |
2142 | static int nfs_open_permission_mask(int openflags) |
2143 | { | |
2144 | int mask = 0; | |
2145 | ||
8a5e929d | 2146 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2147 | mask |= MAY_READ; |
8a5e929d | 2148 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2149 | mask |= MAY_WRITE; |
8a5e929d | 2150 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2151 | mask |= MAY_EXEC; |
2152 | return mask; | |
2153 | } | |
2154 | ||
2155 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2156 | { | |
2157 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2158 | } | |
2159 | ||
10556cb2 | 2160 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2161 | { |
2162 | struct rpc_cred *cred; | |
2163 | int res = 0; | |
2164 | ||
10556cb2 | 2165 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2166 | return -ECHILD; |
2167 | ||
91d5b470 CL |
2168 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2169 | ||
e6305c43 | 2170 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2171 | goto out; |
2172 | /* Is this sys_access() ? */ | |
9cfcac81 | 2173 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2174 | goto force_lookup; |
2175 | ||
2176 | switch (inode->i_mode & S_IFMT) { | |
2177 | case S_IFLNK: | |
2178 | goto out; | |
2179 | case S_IFREG: | |
2180 | /* NFSv4 has atomic_open... */ | |
2181 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2182 | && (mask & MAY_OPEN) |
2183 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2184 | goto out; |
2185 | break; | |
2186 | case S_IFDIR: | |
2187 | /* | |
2188 | * Optimize away all write operations, since the server | |
2189 | * will check permissions when we perform the op. | |
2190 | */ | |
2191 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2192 | goto out; | |
2193 | } | |
2194 | ||
2195 | force_lookup: | |
1da177e4 LT |
2196 | if (!NFS_PROTO(inode)->access) |
2197 | goto out_notsup; | |
2198 | ||
98a8e323 | 2199 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2200 | if (!IS_ERR(cred)) { |
2201 | res = nfs_do_access(inode, cred, mask); | |
2202 | put_rpccred(cred); | |
2203 | } else | |
2204 | res = PTR_ERR(cred); | |
1da177e4 | 2205 | out: |
f696a365 MS |
2206 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2207 | res = -EACCES; | |
2208 | ||
1e7cb3dc CL |
2209 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2210 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2211 | return res; |
2212 | out_notsup: | |
2213 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2214 | if (res == 0) | |
2830ba7f | 2215 | res = generic_permission(inode, mask); |
1e7cb3dc | 2216 | goto out; |
1da177e4 LT |
2217 | } |
2218 | ||
2219 | /* | |
2220 | * Local variables: | |
2221 | * version-control: t | |
2222 | * kept-new-versions: 5 | |
2223 | * End: | |
2224 | */ |