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> |
1da177e4 LT |
36 | |
37 | #include "delegation.h" | |
91d5b470 | 38 | #include "iostat.h" |
4c30d56e | 39 | #include "internal.h" |
cd9a1c0e | 40 | #include "fscache.h" |
1da177e4 | 41 | |
1da177e4 LT |
42 | /* #define NFS_DEBUG_VERBOSE 1 */ |
43 | ||
44 | static int nfs_opendir(struct inode *, struct file *); | |
45 | static int nfs_readdir(struct file *, void *, filldir_t); | |
46 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
47 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
48 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
49 | static int nfs_rmdir(struct inode *, struct dentry *); | |
50 | static int nfs_unlink(struct inode *, struct dentry *); | |
51 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
52 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
53 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
54 | static int nfs_rename(struct inode *, struct dentry *, | |
55 | struct inode *, struct dentry *); | |
7ea80859 | 56 | static int nfs_fsync_dir(struct file *, int); |
f0dd2136 | 57 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
d1bacf9e | 58 | static int nfs_readdir_clear_array(struct page*, gfp_t); |
1da177e4 | 59 | |
4b6f5d20 | 60 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 61 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
62 | .read = generic_read_dir, |
63 | .readdir = nfs_readdir, | |
64 | .open = nfs_opendir, | |
65 | .release = nfs_release, | |
66 | .fsync = nfs_fsync_dir, | |
67 | }; | |
68 | ||
92e1d5be | 69 | const struct inode_operations nfs_dir_inode_operations = { |
1da177e4 LT |
70 | .create = nfs_create, |
71 | .lookup = nfs_lookup, | |
72 | .link = nfs_link, | |
73 | .unlink = nfs_unlink, | |
74 | .symlink = nfs_symlink, | |
75 | .mkdir = nfs_mkdir, | |
76 | .rmdir = nfs_rmdir, | |
77 | .mknod = nfs_mknod, | |
78 | .rename = nfs_rename, | |
79 | .permission = nfs_permission, | |
80 | .getattr = nfs_getattr, | |
81 | .setattr = nfs_setattr, | |
82 | }; | |
83 | ||
d1bacf9e BS |
84 | const struct address_space_operations nfs_dir_addr_space_ops = { |
85 | .releasepage = nfs_readdir_clear_array, | |
86 | }; | |
87 | ||
b7fa0554 | 88 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 89 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
90 | .create = nfs_create, |
91 | .lookup = nfs_lookup, | |
92 | .link = nfs_link, | |
93 | .unlink = nfs_unlink, | |
94 | .symlink = nfs_symlink, | |
95 | .mkdir = nfs_mkdir, | |
96 | .rmdir = nfs_rmdir, | |
97 | .mknod = nfs_mknod, | |
98 | .rename = nfs_rename, | |
99 | .permission = nfs_permission, | |
100 | .getattr = nfs_getattr, | |
101 | .setattr = nfs_setattr, | |
102 | .listxattr = nfs3_listxattr, | |
103 | .getxattr = nfs3_getxattr, | |
104 | .setxattr = nfs3_setxattr, | |
105 | .removexattr = nfs3_removexattr, | |
106 | }; | |
107 | #endif /* CONFIG_NFS_V3 */ | |
108 | ||
1da177e4 LT |
109 | #ifdef CONFIG_NFS_V4 |
110 | ||
111 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
c0204fd2 | 112 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd); |
92e1d5be | 113 | const struct inode_operations nfs4_dir_inode_operations = { |
c0204fd2 | 114 | .create = nfs_open_create, |
1da177e4 LT |
115 | .lookup = nfs_atomic_lookup, |
116 | .link = nfs_link, | |
117 | .unlink = nfs_unlink, | |
118 | .symlink = nfs_symlink, | |
119 | .mkdir = nfs_mkdir, | |
120 | .rmdir = nfs_rmdir, | |
121 | .mknod = nfs_mknod, | |
122 | .rename = nfs_rename, | |
123 | .permission = nfs_permission, | |
124 | .getattr = nfs_getattr, | |
125 | .setattr = nfs_setattr, | |
6b3b5496 BF |
126 | .getxattr = nfs4_getxattr, |
127 | .setxattr = nfs4_setxattr, | |
128 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
129 | }; |
130 | ||
131 | #endif /* CONFIG_NFS_V4 */ | |
132 | ||
133 | /* | |
134 | * Open file | |
135 | */ | |
136 | static int | |
137 | nfs_opendir(struct inode *inode, struct file *filp) | |
138 | { | |
7451c4f0 | 139 | int res; |
1da177e4 | 140 | |
6da24bc9 | 141 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
142 | filp->f_path.dentry->d_parent->d_name.name, |
143 | filp->f_path.dentry->d_name.name); | |
144 | ||
145 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 146 | |
1da177e4 | 147 | /* Call generic open code in order to cache credentials */ |
7451c4f0 | 148 | res = nfs_open(inode, filp); |
f5a73672 NB |
149 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
150 | /* This is a mountpoint, so d_revalidate will never | |
151 | * have been called, so we need to refresh the | |
152 | * inode (for close-open consistency) ourselves. | |
153 | */ | |
154 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
155 | } | |
1da177e4 LT |
156 | return res; |
157 | } | |
158 | ||
d1bacf9e BS |
159 | struct nfs_cache_array_entry { |
160 | u64 cookie; | |
161 | u64 ino; | |
162 | struct qstr string; | |
163 | }; | |
164 | ||
165 | struct nfs_cache_array { | |
166 | unsigned int size; | |
167 | int eof_index; | |
168 | u64 last_cookie; | |
169 | struct nfs_cache_array_entry array[0]; | |
170 | }; | |
171 | ||
172 | #define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry)) | |
173 | ||
0dbb4c67 | 174 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
1da177e4 LT |
175 | typedef struct { |
176 | struct file *file; | |
177 | struct page *page; | |
178 | unsigned long page_index; | |
f0dd2136 TM |
179 | u64 *dir_cookie; |
180 | loff_t current_index; | |
1da177e4 | 181 | decode_dirent_t decode; |
d1bacf9e | 182 | |
1f4eab7e | 183 | unsigned long timestamp; |
4704f0e2 | 184 | unsigned long gencount; |
d1bacf9e BS |
185 | unsigned int cache_entry_index; |
186 | unsigned int plus:1; | |
187 | unsigned int eof:1; | |
1da177e4 LT |
188 | } nfs_readdir_descriptor_t; |
189 | ||
d1bacf9e BS |
190 | /* |
191 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
192 | */ |
193 | static | |
d1bacf9e BS |
194 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
195 | { | |
196 | if (page == NULL) | |
197 | return ERR_PTR(-EIO); | |
198 | return (struct nfs_cache_array *)kmap(page); | |
199 | } | |
200 | ||
201 | static | |
202 | void nfs_readdir_release_array(struct page *page) | |
203 | { | |
204 | kunmap(page); | |
205 | } | |
206 | ||
207 | /* | |
208 | * we are freeing strings created by nfs_add_to_readdir_array() | |
209 | */ | |
210 | static | |
211 | int nfs_readdir_clear_array(struct page *page, gfp_t mask) | |
212 | { | |
213 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
214 | int i; | |
215 | for (i = 0; i < array->size; i++) | |
216 | kfree(array->array[i].string.name); | |
217 | nfs_readdir_release_array(page); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
222 | * the caller is responsible for freeing qstr.name | |
223 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
224 | * nfs_clear_readdir_array() | |
225 | */ | |
226 | static | |
227 | void nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) | |
228 | { | |
229 | string->len = len; | |
230 | string->name = kmemdup(name, len, GFP_KERNEL); | |
231 | string->hash = full_name_hash(string->name, string->len); | |
232 | } | |
233 | ||
234 | static | |
235 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
236 | { | |
237 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
238 | if (IS_ERR(array)) | |
239 | return PTR_ERR(array); | |
240 | if (array->size >= MAX_READDIR_ARRAY) { | |
241 | nfs_readdir_release_array(page); | |
242 | return -EIO; | |
243 | } | |
244 | ||
245 | array->array[array->size].cookie = entry->prev_cookie; | |
246 | array->last_cookie = entry->cookie; | |
247 | array->array[array->size].ino = entry->ino; | |
248 | nfs_readdir_make_qstr(&array->array[array->size].string, entry->name, entry->len); | |
249 | if (entry->eof == 1) | |
250 | array->eof_index = array->size; | |
251 | array->size++; | |
252 | nfs_readdir_release_array(page); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static | |
257 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
258 | { | |
259 | loff_t diff = desc->file->f_pos - desc->current_index; | |
260 | unsigned int index; | |
261 | ||
262 | if (diff < 0) | |
263 | goto out_eof; | |
264 | if (diff >= array->size) { | |
265 | if (array->eof_index > 0) | |
266 | goto out_eof; | |
267 | desc->current_index += array->size; | |
268 | return -EAGAIN; | |
269 | } | |
270 | ||
271 | index = (unsigned int)diff; | |
272 | *desc->dir_cookie = array->array[index].cookie; | |
273 | desc->cache_entry_index = index; | |
274 | if (index == array->eof_index) | |
275 | desc->eof = 1; | |
276 | return 0; | |
277 | out_eof: | |
278 | desc->eof = 1; | |
279 | return -EBADCOOKIE; | |
280 | } | |
281 | ||
282 | static | |
283 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
284 | { | |
285 | int i; | |
286 | int status = -EAGAIN; | |
287 | ||
288 | for (i = 0; i < array->size; i++) { | |
289 | if (i == array->eof_index) { | |
290 | desc->eof = 1; | |
291 | status = -EBADCOOKIE; | |
292 | } | |
293 | if (array->array[i].cookie == *desc->dir_cookie) { | |
294 | desc->cache_entry_index = i; | |
295 | status = 0; | |
296 | break; | |
297 | } | |
298 | } | |
299 | ||
300 | return status; | |
301 | } | |
302 | ||
303 | static | |
304 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
305 | { | |
306 | struct nfs_cache_array *array; | |
307 | int status = -EBADCOOKIE; | |
308 | ||
309 | if (desc->dir_cookie == NULL) | |
310 | goto out; | |
311 | ||
312 | array = nfs_readdir_get_array(desc->page); | |
313 | if (IS_ERR(array)) { | |
314 | status = PTR_ERR(array); | |
315 | goto out; | |
316 | } | |
317 | ||
318 | if (*desc->dir_cookie == 0) | |
319 | status = nfs_readdir_search_for_pos(array, desc); | |
320 | else | |
321 | status = nfs_readdir_search_for_cookie(array, desc); | |
322 | ||
323 | nfs_readdir_release_array(desc->page); | |
324 | out: | |
325 | return status; | |
326 | } | |
327 | ||
328 | /* Fill a page with xdr information before transferring to the cache page */ | |
329 | static | |
330 | int nfs_readdir_xdr_filler(struct page *xdr_page, nfs_readdir_descriptor_t *desc, | |
331 | struct nfs_entry *entry, struct file *file, struct inode *inode) | |
1da177e4 | 332 | { |
1da177e4 | 333 | struct rpc_cred *cred = nfs_file_cred(file); |
4704f0e2 | 334 | unsigned long timestamp, gencount; |
1da177e4 LT |
335 | int error; |
336 | ||
1da177e4 LT |
337 | again: |
338 | timestamp = jiffies; | |
4704f0e2 | 339 | gencount = nfs_inc_attr_generation_counter(); |
d1bacf9e | 340 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, xdr_page, |
1da177e4 LT |
341 | NFS_SERVER(inode)->dtsize, desc->plus); |
342 | if (error < 0) { | |
343 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
344 | if (error == -ENOTSUPP && desc->plus) { | |
345 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 346 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
347 | desc->plus = 0; |
348 | goto again; | |
349 | } | |
350 | goto error; | |
351 | } | |
1f4eab7e | 352 | desc->timestamp = timestamp; |
4704f0e2 | 353 | desc->gencount = gencount; |
d1bacf9e BS |
354 | error: |
355 | return error; | |
1da177e4 LT |
356 | } |
357 | ||
d1bacf9e BS |
358 | /* Fill in an entry based on the xdr code stored in desc->page */ |
359 | static | |
360 | int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, __be32 **ptr) | |
1da177e4 | 361 | { |
d1bacf9e BS |
362 | __be32 *p = *ptr; |
363 | p = desc->decode(p, entry, desc->plus); | |
1da177e4 LT |
364 | if (IS_ERR(p)) |
365 | return PTR_ERR(p); | |
d1bacf9e | 366 | *ptr = p; |
1da177e4 | 367 | |
d1bacf9e BS |
368 | entry->fattr->time_start = desc->timestamp; |
369 | entry->fattr->gencount = desc->gencount; | |
370 | return 0; | |
1da177e4 LT |
371 | } |
372 | ||
d1bacf9e BS |
373 | /* Perform conversion from xdr to cache array */ |
374 | static | |
375 | void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, | |
376 | struct page *xdr_page, struct page *page) | |
1da177e4 | 377 | { |
d1bacf9e BS |
378 | __be32 *ptr = kmap(xdr_page); |
379 | while (xdr_decode(desc, entry, &ptr) == 0) { | |
380 | if (nfs_readdir_add_to_array(entry, page) == -1) | |
1da177e4 | 381 | break; |
1da177e4 | 382 | } |
d1bacf9e | 383 | kunmap(xdr_page); |
1da177e4 LT |
384 | } |
385 | ||
d1bacf9e BS |
386 | static |
387 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 388 | { |
d1bacf9e BS |
389 | struct page *xdr_page; |
390 | struct nfs_entry entry; | |
391 | struct file *file = desc->file; | |
392 | struct nfs_cache_array *array; | |
393 | int status = 0; | |
394 | ||
395 | entry.prev_cookie = 0; | |
396 | entry.cookie = *desc->dir_cookie; | |
397 | entry.eof = 0; | |
398 | entry.fh = nfs_alloc_fhandle(); | |
399 | entry.fattr = nfs_alloc_fattr(); | |
400 | if (entry.fh == NULL || entry.fattr == NULL) | |
401 | goto out; | |
00a92642 | 402 | |
d1bacf9e BS |
403 | array = nfs_readdir_get_array(page); |
404 | memset(array, 0, sizeof(struct nfs_cache_array)); | |
405 | array->eof_index = -1; | |
00a92642 | 406 | |
d1bacf9e BS |
407 | xdr_page = alloc_page(GFP_KERNEL); |
408 | if (!xdr_page) | |
409 | goto out_release_array; | |
410 | do { | |
411 | status = nfs_readdir_xdr_filler(xdr_page, desc, &entry, file, inode); | |
412 | if (status < 0) | |
00a92642 | 413 | break; |
d1bacf9e BS |
414 | nfs_readdir_page_filler(desc, &entry, xdr_page, page); |
415 | } while (array->eof_index < 0 && array->size < MAX_READDIR_ARRAY); | |
416 | ||
417 | put_page(xdr_page); | |
418 | out_release_array: | |
419 | nfs_readdir_release_array(page); | |
420 | out: | |
421 | nfs_free_fattr(entry.fattr); | |
422 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
423 | return status; |
424 | } | |
425 | ||
426 | /* | |
d1bacf9e BS |
427 | * Now we cache directories properly, by converting xdr information |
428 | * to an array that can be used for lookups later. This results in | |
429 | * fewer cache pages, since we can store more information on each page. | |
430 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 431 | */ |
d1bacf9e BS |
432 | static |
433 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 434 | { |
01cce933 | 435 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 436 | |
d1bacf9e BS |
437 | if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) |
438 | goto error; | |
439 | SetPageUptodate(page); | |
1da177e4 | 440 | |
d1bacf9e BS |
441 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
442 | /* Should never happen */ | |
443 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 444 | } |
d1bacf9e BS |
445 | unlock_page(page); |
446 | return 0; | |
447 | error: | |
448 | unlock_page(page); | |
449 | return -EIO; | |
450 | } | |
1da177e4 | 451 | |
d1bacf9e BS |
452 | static |
453 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
454 | { | |
455 | page_cache_release(desc->page); | |
456 | desc->page = NULL; | |
457 | } | |
458 | ||
459 | static | |
460 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
461 | { | |
462 | struct page *page; | |
463 | page = read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, | |
464 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); | |
465 | if (IS_ERR(page)) | |
466 | desc->eof = 1; | |
467 | return page; | |
1da177e4 LT |
468 | } |
469 | ||
470 | /* | |
d1bacf9e | 471 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 472 | */ |
d1bacf9e BS |
473 | static |
474 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
475 | { | |
476 | int res; | |
477 | ||
478 | desc->page = get_cache_page(desc); | |
479 | if (IS_ERR(desc->page)) | |
480 | return PTR_ERR(desc->page); | |
481 | ||
482 | res = nfs_readdir_search_array(desc); | |
483 | if (res == 0) | |
484 | return 0; | |
485 | cache_page_release(desc); | |
486 | return res; | |
487 | } | |
488 | ||
489 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
490 | static inline |
491 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
492 | { | |
d1bacf9e BS |
493 | int res = -EAGAIN; |
494 | desc->page_index = 0; | |
495 | ||
496 | if (*desc->dir_cookie == 0) | |
497 | desc->cache_entry_index = 0; | |
498 | ||
499 | while (1) { | |
500 | res = find_cache_page(desc); | |
1da177e4 LT |
501 | if (res != -EAGAIN) |
502 | break; | |
d1bacf9e | 503 | desc->page_index++; |
1da177e4 | 504 | } |
1da177e4 LT |
505 | return res; |
506 | } | |
507 | ||
508 | static inline unsigned int dt_type(struct inode *inode) | |
509 | { | |
510 | return (inode->i_mode >> 12) & 15; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Once we've found the start of the dirent within a page: fill 'er up... | |
515 | */ | |
516 | static | |
517 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
518 | filldir_t filldir) | |
519 | { | |
520 | struct file *file = desc->file; | |
d1bacf9e BS |
521 | int i = 0; |
522 | int res = 0; | |
523 | struct nfs_cache_array *array = NULL; | |
524 | unsigned int d_type = DT_UNKNOWN; | |
525 | struct dentry *dentry = NULL; | |
526 | ||
527 | array = nfs_readdir_get_array(desc->page); | |
528 | ||
529 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
530 | d_type = DT_UNKNOWN; | |
1da177e4 | 531 | |
d1bacf9e BS |
532 | res = filldir(dirent, array->array[i].string.name, |
533 | array->array[i].string.len, file->f_pos, | |
534 | nfs_compat_user_ino64(array->array[i].ino), d_type); | |
1da177e4 LT |
535 | if (res < 0) |
536 | break; | |
00a92642 | 537 | file->f_pos++; |
d1bacf9e BS |
538 | desc->cache_entry_index = i; |
539 | if (i < (array->size-1)) | |
540 | *desc->dir_cookie = array->array[i+1].cookie; | |
541 | else | |
542 | *desc->dir_cookie = array->last_cookie; | |
543 | if (i == array->eof_index) { | |
544 | desc->eof = 1; | |
1da177e4 LT |
545 | break; |
546 | } | |
1da177e4 | 547 | } |
d1bacf9e BS |
548 | |
549 | nfs_readdir_release_array(desc->page); | |
550 | cache_page_release(desc); | |
1da177e4 LT |
551 | if (dentry != NULL) |
552 | dput(dentry); | |
1e7cb3dc CL |
553 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
554 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
555 | return res; |
556 | } | |
557 | ||
558 | /* | |
559 | * If we cannot find a cookie in our cache, we suspect that this is | |
560 | * because it points to a deleted file, so we ask the server to return | |
561 | * whatever it thinks is the next entry. We then feed this to filldir. | |
562 | * If all goes well, we should then be able to find our way round the | |
563 | * cache on the next call to readdir_search_pagecache(); | |
564 | * | |
565 | * NOTE: we cannot add the anonymous page to the pagecache because | |
566 | * the data it contains might not be page aligned. Besides, | |
567 | * we should already have a complete representation of the | |
568 | * directory in the page cache by the time we get here. | |
569 | */ | |
570 | static inline | |
571 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
572 | filldir_t filldir) | |
573 | { | |
1da177e4 LT |
574 | struct page *page = NULL; |
575 | int status; | |
d1bacf9e | 576 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 577 | |
1e7cb3dc CL |
578 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
579 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
580 | |
581 | page = alloc_page(GFP_HIGHUSER); | |
582 | if (!page) { | |
583 | status = -ENOMEM; | |
584 | goto out; | |
585 | } | |
d1bacf9e BS |
586 | |
587 | if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) { | |
1da177e4 | 588 | status = -EIO; |
1da177e4 | 589 | goto out_release; |
d1bacf9e | 590 | } |
1da177e4 | 591 | |
d1bacf9e | 592 | desc->page = page; |
1da177e4 LT |
593 | status = nfs_do_filldir(desc, dirent, filldir); |
594 | ||
1da177e4 | 595 | out: |
1e7cb3dc | 596 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 597 | __func__, status); |
1da177e4 LT |
598 | return status; |
599 | out_release: | |
d1bacf9e | 600 | cache_page_release(desc); |
1da177e4 LT |
601 | goto out; |
602 | } | |
603 | ||
00a92642 OG |
604 | /* The file offset position represents the dirent entry number. A |
605 | last cookie cache takes care of the common case of reading the | |
606 | whole directory. | |
1da177e4 LT |
607 | */ |
608 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
609 | { | |
01cce933 | 610 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
611 | struct inode *inode = dentry->d_inode; |
612 | nfs_readdir_descriptor_t my_desc, | |
613 | *desc = &my_desc; | |
aa49b4cf | 614 | int res = -ENOMEM; |
1da177e4 | 615 | |
6da24bc9 | 616 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
617 | dentry->d_parent->d_name.name, dentry->d_name.name, |
618 | (long long)filp->f_pos); | |
91d5b470 CL |
619 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
620 | ||
1da177e4 | 621 | /* |
00a92642 | 622 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 623 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
624 | * to either find the entry with the appropriate number or |
625 | * revalidate the cookie. | |
1da177e4 LT |
626 | */ |
627 | memset(desc, 0, sizeof(*desc)); | |
628 | ||
629 | desc->file = filp; | |
cd3758e3 | 630 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
631 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
632 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
633 | ||
565277f6 | 634 | nfs_block_sillyrename(dentry); |
1cda707d | 635 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
636 | if (res < 0) |
637 | goto out; | |
638 | ||
d1bacf9e | 639 | while (desc->eof != 1) { |
1da177e4 | 640 | res = readdir_search_pagecache(desc); |
00a92642 | 641 | |
1da177e4 LT |
642 | if (res == -EBADCOOKIE) { |
643 | /* This means either end of directory */ | |
d1bacf9e | 644 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
645 | /* Or that the server has 'lost' a cookie */ |
646 | res = uncached_readdir(desc, dirent, filldir); | |
647 | if (res >= 0) | |
648 | continue; | |
649 | } | |
650 | res = 0; | |
651 | break; | |
652 | } | |
653 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 654 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
655 | nfs_zap_caches(inode); |
656 | desc->plus = 0; | |
d1bacf9e | 657 | desc->eof = 0; |
1da177e4 LT |
658 | continue; |
659 | } | |
660 | if (res < 0) | |
661 | break; | |
662 | ||
663 | res = nfs_do_filldir(desc, dirent, filldir); | |
664 | if (res < 0) { | |
665 | res = 0; | |
666 | break; | |
667 | } | |
668 | } | |
fccca7fc | 669 | out: |
565277f6 | 670 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
671 | if (res > 0) |
672 | res = 0; | |
aa49b4cf | 673 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
674 | dentry->d_parent->d_name.name, dentry->d_name.name, |
675 | res); | |
676 | return res; | |
1da177e4 LT |
677 | } |
678 | ||
10afec90 | 679 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 680 | { |
b84e06c5 CL |
681 | struct dentry *dentry = filp->f_path.dentry; |
682 | struct inode *inode = dentry->d_inode; | |
683 | ||
6da24bc9 | 684 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
685 | dentry->d_parent->d_name.name, |
686 | dentry->d_name.name, | |
687 | offset, origin); | |
688 | ||
689 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
690 | switch (origin) { |
691 | case 1: | |
692 | offset += filp->f_pos; | |
693 | case 0: | |
694 | if (offset >= 0) | |
695 | break; | |
696 | default: | |
697 | offset = -EINVAL; | |
698 | goto out; | |
699 | } | |
700 | if (offset != filp->f_pos) { | |
701 | filp->f_pos = offset; | |
cd3758e3 | 702 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
703 | } |
704 | out: | |
b84e06c5 | 705 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
706 | return offset; |
707 | } | |
708 | ||
1da177e4 LT |
709 | /* |
710 | * All directory operations under NFS are synchronous, so fsync() | |
711 | * is a dummy operation. | |
712 | */ | |
7ea80859 | 713 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 714 | { |
7ea80859 CH |
715 | struct dentry *dentry = filp->f_path.dentry; |
716 | ||
6da24bc9 | 717 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
718 | dentry->d_parent->d_name.name, dentry->d_name.name, |
719 | datasync); | |
720 | ||
54917786 | 721 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
722 | return 0; |
723 | } | |
724 | ||
bfc69a45 TM |
725 | /** |
726 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
727 | * @dir - pointer to directory inode | |
728 | * | |
729 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
730 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
731 | * on the server that might have invalidated our dcache. | |
732 | * | |
733 | * The caller should be holding dir->i_lock | |
734 | */ | |
735 | void nfs_force_lookup_revalidate(struct inode *dir) | |
736 | { | |
011935a0 | 737 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
738 | } |
739 | ||
1da177e4 LT |
740 | /* |
741 | * A check for whether or not the parent directory has changed. | |
742 | * In the case it has, we assume that the dentries are untrustworthy | |
743 | * and may need to be looked up again. | |
744 | */ | |
c79ba787 | 745 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
746 | { |
747 | if (IS_ROOT(dentry)) | |
748 | return 1; | |
4eec952e TM |
749 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
750 | return 0; | |
f2c77f4e TM |
751 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
752 | return 0; | |
753 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
754 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
755 | return 0; | |
756 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
757 | return 0; | |
758 | return 1; | |
1da177e4 LT |
759 | } |
760 | ||
1d6757fb TM |
761 | /* |
762 | * Return the intent data that applies to this particular path component | |
763 | * | |
764 | * Note that the current set of intents only apply to the very last | |
765 | * component of the path. | |
766 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
767 | */ | |
768 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
769 | { | |
770 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
771 | return 0; | |
772 | return nd->flags & mask; | |
773 | } | |
774 | ||
a12802ca TM |
775 | /* |
776 | * Use intent information to check whether or not we're going to do | |
777 | * an O_EXCL create using this path component. | |
778 | */ | |
779 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
780 | { | |
781 | if (NFS_PROTO(dir)->version == 2) | |
782 | return 0; | |
3516586a | 783 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
784 | } |
785 | ||
1d6757fb TM |
786 | /* |
787 | * Inode and filehandle revalidation for lookups. | |
788 | * | |
789 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
790 | * or if the intent information indicates that we're about to open this | |
791 | * particular file and the "nocto" mount flag is not set. | |
792 | * | |
793 | */ | |
1da177e4 LT |
794 | static inline |
795 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
796 | { | |
797 | struct nfs_server *server = NFS_SERVER(inode); | |
798 | ||
4e99a1ff TM |
799 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
800 | return 0; | |
1da177e4 | 801 | if (nd != NULL) { |
1da177e4 | 802 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 803 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
804 | goto out_force; |
805 | /* This is an open(2) */ | |
1d6757fb | 806 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
807 | !(server->flags & NFS_MOUNT_NOCTO) && |
808 | (S_ISREG(inode->i_mode) || | |
809 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 810 | goto out_force; |
4f48af45 | 811 | return 0; |
1da177e4 LT |
812 | } |
813 | return nfs_revalidate_inode(server, inode); | |
814 | out_force: | |
815 | return __nfs_revalidate_inode(server, inode); | |
816 | } | |
817 | ||
818 | /* | |
819 | * We judge how long we want to trust negative | |
820 | * dentries by looking at the parent inode mtime. | |
821 | * | |
822 | * If parent mtime has changed, we revalidate, else we wait for a | |
823 | * period corresponding to the parent's attribute cache timeout value. | |
824 | */ | |
825 | static inline | |
826 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
827 | struct nameidata *nd) | |
828 | { | |
1da177e4 | 829 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 830 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 831 | return 0; |
4eec952e TM |
832 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
833 | return 1; | |
1da177e4 LT |
834 | return !nfs_check_verifier(dir, dentry); |
835 | } | |
836 | ||
837 | /* | |
838 | * This is called every time the dcache has a lookup hit, | |
839 | * and we should check whether we can really trust that | |
840 | * lookup. | |
841 | * | |
842 | * NOTE! The hit can be a negative hit too, don't assume | |
843 | * we have an inode! | |
844 | * | |
845 | * If the parent directory is seen to have changed, we throw out the | |
846 | * cached dentry and do a new lookup. | |
847 | */ | |
848 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
849 | { | |
850 | struct inode *dir; | |
851 | struct inode *inode; | |
852 | struct dentry *parent; | |
e1fb4d05 TM |
853 | struct nfs_fh *fhandle = NULL; |
854 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 855 | int error; |
1da177e4 LT |
856 | |
857 | parent = dget_parent(dentry); | |
1da177e4 | 858 | dir = parent->d_inode; |
91d5b470 | 859 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
860 | inode = dentry->d_inode; |
861 | ||
862 | if (!inode) { | |
863 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
864 | goto out_bad; | |
865 | goto out_valid; | |
866 | } | |
867 | ||
868 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 869 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 870 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 871 | dentry->d_name.name); |
1da177e4 LT |
872 | goto out_bad; |
873 | } | |
874 | ||
15860ab1 TM |
875 | if (nfs_have_delegation(inode, FMODE_READ)) |
876 | goto out_set_verifier; | |
877 | ||
1da177e4 | 878 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 879 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
880 | if (nfs_lookup_verify_inode(inode, nd)) |
881 | goto out_zap_parent; | |
882 | goto out_valid; | |
883 | } | |
884 | ||
885 | if (NFS_STALE(inode)) | |
886 | goto out_bad; | |
887 | ||
e1fb4d05 TM |
888 | error = -ENOMEM; |
889 | fhandle = nfs_alloc_fhandle(); | |
890 | fattr = nfs_alloc_fattr(); | |
891 | if (fhandle == NULL || fattr == NULL) | |
892 | goto out_error; | |
893 | ||
894 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1da177e4 LT |
895 | if (error) |
896 | goto out_bad; | |
e1fb4d05 | 897 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 898 | goto out_bad; |
e1fb4d05 | 899 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
900 | goto out_bad; |
901 | ||
e1fb4d05 TM |
902 | nfs_free_fattr(fattr); |
903 | nfs_free_fhandle(fhandle); | |
15860ab1 | 904 | out_set_verifier: |
cf8ba45e | 905 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 906 | out_valid: |
1da177e4 | 907 | dput(parent); |
1e7cb3dc | 908 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 909 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 910 | dentry->d_name.name); |
1da177e4 LT |
911 | return 1; |
912 | out_zap_parent: | |
913 | nfs_zap_caches(dir); | |
914 | out_bad: | |
a1643a92 | 915 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
916 | if (inode && S_ISDIR(inode->i_mode)) { |
917 | /* Purge readdir caches. */ | |
918 | nfs_zap_caches(inode); | |
919 | /* If we have submounts, don't unhash ! */ | |
920 | if (have_submounts(dentry)) | |
921 | goto out_valid; | |
d9e80b7d AV |
922 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
923 | goto out_valid; | |
1da177e4 LT |
924 | shrink_dcache_parent(dentry); |
925 | } | |
926 | d_drop(dentry); | |
e1fb4d05 TM |
927 | nfs_free_fattr(fattr); |
928 | nfs_free_fhandle(fhandle); | |
1da177e4 | 929 | dput(parent); |
1e7cb3dc | 930 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 931 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 932 | dentry->d_name.name); |
1da177e4 | 933 | return 0; |
e1fb4d05 TM |
934 | out_error: |
935 | nfs_free_fattr(fattr); | |
936 | nfs_free_fhandle(fhandle); | |
937 | dput(parent); | |
938 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
939 | __func__, dentry->d_parent->d_name.name, | |
940 | dentry->d_name.name, error); | |
941 | return error; | |
1da177e4 LT |
942 | } |
943 | ||
944 | /* | |
945 | * This is called from dput() when d_count is going to 0. | |
946 | */ | |
947 | static int nfs_dentry_delete(struct dentry *dentry) | |
948 | { | |
949 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
950 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
951 | dentry->d_flags); | |
952 | ||
77f11192 TM |
953 | /* Unhash any dentry with a stale inode */ |
954 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
955 | return 1; | |
956 | ||
1da177e4 LT |
957 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
958 | /* Unhash it, so that ->d_iput() would be called */ | |
959 | return 1; | |
960 | } | |
961 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
962 | /* Unhash it, so that ancestors of killed async unlink | |
963 | * files will be cleaned up during umount */ | |
964 | return 1; | |
965 | } | |
966 | return 0; | |
967 | ||
968 | } | |
969 | ||
1b83d707 TM |
970 | static void nfs_drop_nlink(struct inode *inode) |
971 | { | |
972 | spin_lock(&inode->i_lock); | |
973 | if (inode->i_nlink > 0) | |
974 | drop_nlink(inode); | |
975 | spin_unlock(&inode->i_lock); | |
976 | } | |
977 | ||
1da177e4 LT |
978 | /* |
979 | * Called when the dentry loses inode. | |
980 | * We use it to clean up silly-renamed files. | |
981 | */ | |
982 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
983 | { | |
83672d39 NB |
984 | if (S_ISDIR(inode->i_mode)) |
985 | /* drop any readdir cache as it could easily be old */ | |
986 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
987 | ||
1da177e4 | 988 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 989 | drop_nlink(inode); |
e4eff1a6 | 990 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 991 | } |
1da177e4 LT |
992 | iput(inode); |
993 | } | |
994 | ||
f786aa90 | 995 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
996 | .d_revalidate = nfs_lookup_revalidate, |
997 | .d_delete = nfs_dentry_delete, | |
998 | .d_iput = nfs_dentry_iput, | |
999 | }; | |
1000 | ||
1da177e4 LT |
1001 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1002 | { | |
1003 | struct dentry *res; | |
565277f6 | 1004 | struct dentry *parent; |
1da177e4 | 1005 | struct inode *inode = NULL; |
e1fb4d05 TM |
1006 | struct nfs_fh *fhandle = NULL; |
1007 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1008 | int error; |
1da177e4 LT |
1009 | |
1010 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1011 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1012 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1013 | |
1014 | res = ERR_PTR(-ENAMETOOLONG); | |
1015 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1016 | goto out; | |
1017 | ||
1da177e4 LT |
1018 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
1019 | ||
fd684071 TM |
1020 | /* |
1021 | * If we're doing an exclusive create, optimize away the lookup | |
1022 | * but don't hash the dentry. | |
1023 | */ | |
1024 | if (nfs_is_exclusive_create(dir, nd)) { | |
1025 | d_instantiate(dentry, NULL); | |
1026 | res = NULL; | |
fc0f684c | 1027 | goto out; |
fd684071 | 1028 | } |
1da177e4 | 1029 | |
e1fb4d05 TM |
1030 | res = ERR_PTR(-ENOMEM); |
1031 | fhandle = nfs_alloc_fhandle(); | |
1032 | fattr = nfs_alloc_fattr(); | |
1033 | if (fhandle == NULL || fattr == NULL) | |
1034 | goto out; | |
1035 | ||
565277f6 TM |
1036 | parent = dentry->d_parent; |
1037 | /* Protect against concurrent sillydeletes */ | |
1038 | nfs_block_sillyrename(parent); | |
e1fb4d05 | 1039 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1040 | if (error == -ENOENT) |
1041 | goto no_entry; | |
1042 | if (error < 0) { | |
1043 | res = ERR_PTR(error); | |
565277f6 | 1044 | goto out_unblock_sillyrename; |
1da177e4 | 1045 | } |
e1fb4d05 | 1046 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1047 | res = (struct dentry *)inode; |
1048 | if (IS_ERR(res)) | |
565277f6 | 1049 | goto out_unblock_sillyrename; |
54ceac45 | 1050 | |
1da177e4 | 1051 | no_entry: |
54ceac45 | 1052 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1053 | if (res != NULL) { |
1054 | if (IS_ERR(res)) | |
565277f6 | 1055 | goto out_unblock_sillyrename; |
1da177e4 | 1056 | dentry = res; |
9eaef27b | 1057 | } |
1da177e4 | 1058 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1059 | out_unblock_sillyrename: |
1060 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1061 | out: |
e1fb4d05 TM |
1062 | nfs_free_fattr(fattr); |
1063 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1064 | return res; |
1065 | } | |
1066 | ||
1067 | #ifdef CONFIG_NFS_V4 | |
1068 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1069 | ||
f786aa90 | 1070 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1071 | .d_revalidate = nfs_open_revalidate, |
1072 | .d_delete = nfs_dentry_delete, | |
1073 | .d_iput = nfs_dentry_iput, | |
1074 | }; | |
1075 | ||
1d6757fb TM |
1076 | /* |
1077 | * Use intent information to determine whether we need to substitute | |
1078 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1079 | */ | |
5584c306 | 1080 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1081 | { |
1d6757fb | 1082 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1083 | return 0; |
1084 | /* NFS does not (yet) have a stateful open for directories */ | |
1085 | if (nd->flags & LOOKUP_DIRECTORY) | |
1086 | return 0; | |
1087 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1088 | if (__mnt_is_readonly(nd->path.mnt) && |
1089 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1090 | return 0; |
1091 | return 1; | |
1092 | } | |
1093 | ||
cd9a1c0e TM |
1094 | static struct nfs_open_context *nameidata_to_nfs_open_context(struct dentry *dentry, struct nameidata *nd) |
1095 | { | |
1096 | struct path path = { | |
1097 | .mnt = nd->path.mnt, | |
1098 | .dentry = dentry, | |
1099 | }; | |
1100 | struct nfs_open_context *ctx; | |
1101 | struct rpc_cred *cred; | |
1102 | fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC); | |
1103 | ||
1104 | cred = rpc_lookup_cred(); | |
1105 | if (IS_ERR(cred)) | |
1106 | return ERR_CAST(cred); | |
1107 | ctx = alloc_nfs_open_context(&path, cred, fmode); | |
1108 | put_rpccred(cred); | |
1109 | if (ctx == NULL) | |
1110 | return ERR_PTR(-ENOMEM); | |
1111 | return ctx; | |
1112 | } | |
1113 | ||
1114 | static int do_open(struct inode *inode, struct file *filp) | |
1115 | { | |
1116 | nfs_fscache_set_inode_cookie(inode, filp); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1121 | { | |
1122 | struct file *filp; | |
1123 | int ret = 0; | |
1124 | ||
1125 | /* If the open_intent is for execute, we have an extra check to make */ | |
1126 | if (ctx->mode & FMODE_EXEC) { | |
1127 | ret = nfs_may_open(ctx->path.dentry->d_inode, | |
1128 | ctx->cred, | |
1129 | nd->intent.open.flags); | |
1130 | if (ret < 0) | |
1131 | goto out; | |
1132 | } | |
1133 | filp = lookup_instantiate_filp(nd, ctx->path.dentry, do_open); | |
1134 | if (IS_ERR(filp)) | |
1135 | ret = PTR_ERR(filp); | |
1136 | else | |
1137 | nfs_file_set_open_context(filp, ctx); | |
1138 | out: | |
1139 | put_nfs_open_context(ctx); | |
1140 | return ret; | |
1141 | } | |
1142 | ||
1da177e4 LT |
1143 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1144 | { | |
cd9a1c0e TM |
1145 | struct nfs_open_context *ctx; |
1146 | struct iattr attr; | |
1da177e4 | 1147 | struct dentry *res = NULL; |
f46e0bd3 | 1148 | struct inode *inode; |
cd9a1c0e | 1149 | int open_flags; |
898f635c | 1150 | int err; |
1da177e4 | 1151 | |
1e7cb3dc CL |
1152 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1153 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1154 | ||
1da177e4 | 1155 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1156 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1157 | goto no_open; |
1158 | ||
1159 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1160 | res = ERR_PTR(-ENAMETOOLONG); | |
1161 | goto out; | |
1162 | } | |
1163 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1164 | ||
d4d9cdcb TM |
1165 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1166 | * the dentry. */ | |
3516586a | 1167 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1168 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1169 | goto out; |
1170 | } | |
1da177e4 | 1171 | |
cd9a1c0e TM |
1172 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1173 | res = ERR_CAST(ctx); | |
1174 | if (IS_ERR(ctx)) | |
1175 | goto out; | |
1176 | ||
1177 | open_flags = nd->intent.open.flags; | |
1178 | if (nd->flags & LOOKUP_CREATE) { | |
1179 | attr.ia_mode = nd->intent.open.create_mode; | |
1180 | attr.ia_valid = ATTR_MODE; | |
1181 | if (!IS_POSIXACL(dir)) | |
1182 | attr.ia_mode &= ~current_umask(); | |
1183 | } else { | |
898f635c | 1184 | open_flags &= ~(O_EXCL | O_CREAT); |
cd9a1c0e | 1185 | attr.ia_valid = 0; |
cd9a1c0e TM |
1186 | } |
1187 | ||
1da177e4 | 1188 | /* Open the file on the server */ |
f46e0bd3 | 1189 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1190 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1191 | if (IS_ERR(inode)) { |
1192 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1193 | put_nfs_open_context(ctx); |
f46e0bd3 | 1194 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1195 | /* Make a negative dentry */ |
1196 | case -ENOENT: | |
f46e0bd3 | 1197 | d_add(dentry, NULL); |
02a913a7 TM |
1198 | res = NULL; |
1199 | goto out; | |
1da177e4 | 1200 | /* This turned out not to be a regular file */ |
80e60639 | 1201 | case -EISDIR: |
6f926b5b TM |
1202 | case -ENOTDIR: |
1203 | goto no_open; | |
1da177e4 LT |
1204 | case -ELOOP: |
1205 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1206 | goto no_open; | |
1da177e4 LT |
1207 | /* case -EINVAL: */ |
1208 | default: | |
f46e0bd3 | 1209 | res = ERR_CAST(inode); |
1da177e4 LT |
1210 | goto out; |
1211 | } | |
cd9a1c0e | 1212 | } |
f46e0bd3 | 1213 | res = d_add_unique(dentry, inode); |
898f635c | 1214 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 TM |
1215 | if (res != NULL) { |
1216 | dput(ctx->path.dentry); | |
1217 | ctx->path.dentry = dget(res); | |
1da177e4 | 1218 | dentry = res; |
f46e0bd3 | 1219 | } |
898f635c TM |
1220 | err = nfs_intent_set_file(nd, ctx); |
1221 | if (err < 0) { | |
1222 | if (res != NULL) | |
1223 | dput(res); | |
1224 | return ERR_PTR(err); | |
1225 | } | |
1da177e4 | 1226 | out: |
f46e0bd3 | 1227 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1228 | return res; |
1229 | no_open: | |
1230 | return nfs_lookup(dir, dentry, nd); | |
1231 | } | |
1232 | ||
1233 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1234 | { | |
1235 | struct dentry *parent = NULL; | |
1236 | struct inode *inode = dentry->d_inode; | |
1237 | struct inode *dir; | |
b8d4cadd | 1238 | struct nfs_open_context *ctx; |
1da177e4 LT |
1239 | int openflags, ret = 0; |
1240 | ||
1f063d2c | 1241 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1242 | goto no_open; |
2b484297 | 1243 | |
1da177e4 LT |
1244 | parent = dget_parent(dentry); |
1245 | dir = parent->d_inode; | |
2b484297 | 1246 | |
1da177e4 LT |
1247 | /* We can't create new files in nfs_open_revalidate(), so we |
1248 | * optimize away revalidation of negative dentries. | |
1249 | */ | |
216d5d06 TM |
1250 | if (inode == NULL) { |
1251 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1252 | ret = 1; | |
1da177e4 | 1253 | goto out; |
216d5d06 TM |
1254 | } |
1255 | ||
1da177e4 LT |
1256 | /* NFS only supports OPEN on regular files */ |
1257 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1258 | goto no_open_dput; |
1da177e4 LT |
1259 | openflags = nd->intent.open.flags; |
1260 | /* We cannot do exclusive creation on a positive dentry */ | |
1261 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1262 | goto no_open_dput; |
1da177e4 | 1263 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1264 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 | 1265 | |
b8d4cadd TM |
1266 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1267 | ret = PTR_ERR(ctx); | |
1268 | if (IS_ERR(ctx)) | |
1269 | goto out; | |
1da177e4 | 1270 | /* |
1b1dcc1b | 1271 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1272 | * operations that change the directory. We therefore save the |
1273 | * change attribute *before* we do the RPC call. | |
1274 | */ | |
2b484297 | 1275 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, NULL); |
535918f1 TM |
1276 | if (IS_ERR(inode)) { |
1277 | ret = PTR_ERR(inode); | |
1278 | switch (ret) { | |
1279 | case -EPERM: | |
1280 | case -EACCES: | |
1281 | case -EDQUOT: | |
1282 | case -ENOSPC: | |
1283 | case -EROFS: | |
1284 | goto out_put_ctx; | |
1285 | default: | |
1286 | goto out_drop; | |
1287 | } | |
1288 | } | |
1289 | iput(inode); | |
898f635c | 1290 | if (inode != dentry->d_inode) |
535918f1 | 1291 | goto out_drop; |
898f635c TM |
1292 | |
1293 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1294 | ret = nfs_intent_set_file(nd, ctx); | |
1295 | if (ret >= 0) | |
1296 | ret = 1; | |
1da177e4 LT |
1297 | out: |
1298 | dput(parent); | |
1da177e4 | 1299 | return ret; |
535918f1 TM |
1300 | out_drop: |
1301 | d_drop(dentry); | |
1302 | ret = 0; | |
1303 | out_put_ctx: | |
1304 | put_nfs_open_context(ctx); | |
1305 | goto out; | |
1306 | ||
5584c306 | 1307 | no_open_dput: |
1da177e4 | 1308 | dput(parent); |
5584c306 | 1309 | no_open: |
1da177e4 LT |
1310 | return nfs_lookup_revalidate(dentry, nd); |
1311 | } | |
c0204fd2 TM |
1312 | |
1313 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, | |
1314 | struct nameidata *nd) | |
1315 | { | |
1316 | struct nfs_open_context *ctx = NULL; | |
1317 | struct iattr attr; | |
1318 | int error; | |
1319 | int open_flags = 0; | |
1320 | ||
1321 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1322 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1323 | ||
1324 | attr.ia_mode = mode; | |
1325 | attr.ia_valid = ATTR_MODE; | |
1326 | ||
1327 | if ((nd->flags & LOOKUP_CREATE) != 0) { | |
1328 | open_flags = nd->intent.open.flags; | |
1329 | ||
1330 | ctx = nameidata_to_nfs_open_context(dentry, nd); | |
1331 | error = PTR_ERR(ctx); | |
1332 | if (IS_ERR(ctx)) | |
898f635c | 1333 | goto out_err_drop; |
c0204fd2 TM |
1334 | } |
1335 | ||
1336 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1337 | if (error != 0) | |
1338 | goto out_put_ctx; | |
898f635c TM |
1339 | if (ctx != NULL) { |
1340 | error = nfs_intent_set_file(nd, ctx); | |
1341 | if (error < 0) | |
1342 | goto out_err; | |
1343 | } | |
c0204fd2 TM |
1344 | return 0; |
1345 | out_put_ctx: | |
1346 | if (ctx != NULL) | |
1347 | put_nfs_open_context(ctx); | |
898f635c | 1348 | out_err_drop: |
c0204fd2 | 1349 | d_drop(dentry); |
898f635c | 1350 | out_err: |
c0204fd2 TM |
1351 | return error; |
1352 | } | |
1353 | ||
1da177e4 LT |
1354 | #endif /* CONFIG_NFSV4 */ |
1355 | ||
1da177e4 LT |
1356 | /* |
1357 | * Code common to create, mkdir, and mknod. | |
1358 | */ | |
1359 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1360 | struct nfs_fattr *fattr) | |
1361 | { | |
fab728e1 TM |
1362 | struct dentry *parent = dget_parent(dentry); |
1363 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1364 | struct inode *inode; |
1365 | int error = -EACCES; | |
1366 | ||
fab728e1 TM |
1367 | d_drop(dentry); |
1368 | ||
1da177e4 LT |
1369 | /* We may have been initialized further down */ |
1370 | if (dentry->d_inode) | |
fab728e1 | 1371 | goto out; |
1da177e4 | 1372 | if (fhandle->size == 0) { |
1da177e4 LT |
1373 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1374 | if (error) | |
fab728e1 | 1375 | goto out_error; |
1da177e4 | 1376 | } |
5724ab37 | 1377 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1378 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1379 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1380 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1381 | if (error < 0) |
fab728e1 | 1382 | goto out_error; |
1da177e4 | 1383 | } |
1da177e4 | 1384 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1385 | error = PTR_ERR(inode); |
1386 | if (IS_ERR(inode)) | |
fab728e1 TM |
1387 | goto out_error; |
1388 | d_add(dentry, inode); | |
1389 | out: | |
1390 | dput(parent); | |
1da177e4 | 1391 | return 0; |
fab728e1 TM |
1392 | out_error: |
1393 | nfs_mark_for_revalidate(dir); | |
1394 | dput(parent); | |
1395 | return error; | |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | /* | |
1399 | * Following a failed create operation, we drop the dentry rather | |
1400 | * than retain a negative dentry. This avoids a problem in the event | |
1401 | * that the operation succeeded on the server, but an error in the | |
1402 | * reply path made it appear to have failed. | |
1403 | */ | |
1404 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1405 | struct nameidata *nd) | |
1406 | { | |
1407 | struct iattr attr; | |
1408 | int error; | |
1da177e4 | 1409 | |
1e7cb3dc CL |
1410 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1411 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1412 | |
1413 | attr.ia_mode = mode; | |
1414 | attr.ia_valid = ATTR_MODE; | |
1415 | ||
c0204fd2 | 1416 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, 0, NULL); |
1da177e4 LT |
1417 | if (error != 0) |
1418 | goto out_err; | |
1da177e4 LT |
1419 | return 0; |
1420 | out_err: | |
1da177e4 LT |
1421 | d_drop(dentry); |
1422 | return error; | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * See comments for nfs_proc_create regarding failed operations. | |
1427 | */ | |
1428 | static int | |
1429 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1430 | { | |
1431 | struct iattr attr; | |
1432 | int status; | |
1433 | ||
1e7cb3dc CL |
1434 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1435 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1436 | |
1437 | if (!new_valid_dev(rdev)) | |
1438 | return -EINVAL; | |
1439 | ||
1440 | attr.ia_mode = mode; | |
1441 | attr.ia_valid = ATTR_MODE; | |
1442 | ||
1da177e4 | 1443 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1444 | if (status != 0) |
1445 | goto out_err; | |
1da177e4 LT |
1446 | return 0; |
1447 | out_err: | |
1da177e4 LT |
1448 | d_drop(dentry); |
1449 | return status; | |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * See comments for nfs_proc_create regarding failed operations. | |
1454 | */ | |
1455 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1456 | { | |
1457 | struct iattr attr; | |
1458 | int error; | |
1459 | ||
1e7cb3dc CL |
1460 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1461 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1462 | |
1463 | attr.ia_valid = ATTR_MODE; | |
1464 | attr.ia_mode = mode | S_IFDIR; | |
1465 | ||
1da177e4 | 1466 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1467 | if (error != 0) |
1468 | goto out_err; | |
1da177e4 LT |
1469 | return 0; |
1470 | out_err: | |
1471 | d_drop(dentry); | |
1da177e4 LT |
1472 | return error; |
1473 | } | |
1474 | ||
d45b9d8b TM |
1475 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1476 | { | |
1477 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1478 | d_delete(dentry); | |
1479 | } | |
1480 | ||
1da177e4 LT |
1481 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1482 | { | |
1483 | int error; | |
1484 | ||
1e7cb3dc CL |
1485 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1486 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1487 | |
1da177e4 LT |
1488 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1489 | /* Ensure the VFS deletes this inode */ | |
1490 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1491 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1492 | else if (error == -ENOENT) |
1493 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1494 | |
1495 | return error; | |
1496 | } | |
1497 | ||
1da177e4 LT |
1498 | /* |
1499 | * Remove a file after making sure there are no pending writes, | |
1500 | * and after checking that the file has only one user. | |
1501 | * | |
1502 | * We invalidate the attribute cache and free the inode prior to the operation | |
1503 | * to avoid possible races if the server reuses the inode. | |
1504 | */ | |
1505 | static int nfs_safe_remove(struct dentry *dentry) | |
1506 | { | |
1507 | struct inode *dir = dentry->d_parent->d_inode; | |
1508 | struct inode *inode = dentry->d_inode; | |
1509 | int error = -EBUSY; | |
1510 | ||
1511 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1512 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1513 | ||
1514 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1515 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1516 | error = 0; | |
1517 | goto out; | |
1518 | } | |
1519 | ||
1da177e4 | 1520 | if (inode != NULL) { |
cae7a073 | 1521 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1522 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1523 | /* The VFS may want to delete this inode */ | |
1524 | if (error == 0) | |
1b83d707 | 1525 | nfs_drop_nlink(inode); |
5ba7cc48 | 1526 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1527 | } else |
1528 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1529 | if (error == -ENOENT) |
1530 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1531 | out: |
1532 | return error; | |
1533 | } | |
1534 | ||
1535 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1536 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1537 | * | |
1538 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1539 | */ | |
1540 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1541 | { | |
1542 | int error; | |
1543 | int need_rehash = 0; | |
1544 | ||
1545 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1546 | dir->i_ino, dentry->d_name.name); | |
1547 | ||
1da177e4 LT |
1548 | spin_lock(&dcache_lock); |
1549 | spin_lock(&dentry->d_lock); | |
1550 | if (atomic_read(&dentry->d_count) > 1) { | |
1551 | spin_unlock(&dentry->d_lock); | |
1552 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1553 | /* Start asynchronous writeout of the inode */ |
1554 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1555 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1556 | return error; |
1557 | } | |
1558 | if (!d_unhashed(dentry)) { | |
1559 | __d_drop(dentry); | |
1560 | need_rehash = 1; | |
1561 | } | |
1562 | spin_unlock(&dentry->d_lock); | |
1563 | spin_unlock(&dcache_lock); | |
1564 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1565 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1566 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1567 | } else if (need_rehash) | |
1568 | d_rehash(dentry); | |
1da177e4 LT |
1569 | return error; |
1570 | } | |
1571 | ||
873101b3 CL |
1572 | /* |
1573 | * To create a symbolic link, most file systems instantiate a new inode, | |
1574 | * add a page to it containing the path, then write it out to the disk | |
1575 | * using prepare_write/commit_write. | |
1576 | * | |
1577 | * Unfortunately the NFS client can't create the in-core inode first | |
1578 | * because it needs a file handle to create an in-core inode (see | |
1579 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1580 | * symlink request has completed on the server. | |
1581 | * | |
1582 | * So instead we allocate a raw page, copy the symname into it, then do | |
1583 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1584 | * now have a new file handle and can instantiate an in-core NFS inode | |
1585 | * and move the raw page into its mapping. | |
1586 | */ | |
1587 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1588 | { |
873101b3 CL |
1589 | struct pagevec lru_pvec; |
1590 | struct page *page; | |
1591 | char *kaddr; | |
1da177e4 | 1592 | struct iattr attr; |
873101b3 | 1593 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1594 | int error; |
1595 | ||
1596 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1597 | dir->i_ino, dentry->d_name.name, symname); | |
1598 | ||
873101b3 CL |
1599 | if (pathlen > PAGE_SIZE) |
1600 | return -ENAMETOOLONG; | |
1da177e4 | 1601 | |
873101b3 CL |
1602 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1603 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1604 | |
83d93f22 | 1605 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1606 | if (!page) |
873101b3 | 1607 | return -ENOMEM; |
873101b3 CL |
1608 | |
1609 | kaddr = kmap_atomic(page, KM_USER0); | |
1610 | memcpy(kaddr, symname, pathlen); | |
1611 | if (pathlen < PAGE_SIZE) | |
1612 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1613 | kunmap_atomic(kaddr, KM_USER0); | |
1614 | ||
94a6d753 | 1615 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1616 | if (error != 0) { |
1617 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1618 | dir->i_sb->s_id, dir->i_ino, | |
1619 | dentry->d_name.name, symname, error); | |
1da177e4 | 1620 | d_drop(dentry); |
873101b3 | 1621 | __free_page(page); |
873101b3 CL |
1622 | return error; |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * No big deal if we can't add this page to the page cache here. | |
1627 | * READLINK will get the missing page from the server if needed. | |
1628 | */ | |
1629 | pagevec_init(&lru_pvec, 0); | |
1630 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1631 | GFP_KERNEL)) { | |
39cf8a13 | 1632 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1633 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1634 | SetPageUptodate(page); |
1635 | unlock_page(page); | |
1636 | } else | |
1637 | __free_page(page); | |
1638 | ||
873101b3 | 1639 | return 0; |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | static int | |
1643 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1644 | { | |
1645 | struct inode *inode = old_dentry->d_inode; | |
1646 | int error; | |
1647 | ||
1648 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1649 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1650 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1651 | ||
9a3936aa TM |
1652 | nfs_inode_return_delegation(inode); |
1653 | ||
9697d234 | 1654 | d_drop(dentry); |
1da177e4 | 1655 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 TM |
1656 | if (error == 0) { |
1657 | atomic_inc(&inode->i_count); | |
9697d234 | 1658 | d_add(dentry, inode); |
cf809556 | 1659 | } |
1da177e4 LT |
1660 | return error; |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * RENAME | |
1665 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1666 | * different file handle for the same inode after a rename (e.g. when | |
1667 | * moving to a different directory). A fail-safe method to do so would | |
1668 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1669 | * rename the old file using the sillyrename stuff. This way, the original | |
1670 | * file in old_dir will go away when the last process iput()s the inode. | |
1671 | * | |
1672 | * FIXED. | |
1673 | * | |
1674 | * It actually works quite well. One needs to have the possibility for | |
1675 | * at least one ".nfs..." file in each directory the file ever gets | |
1676 | * moved or linked to which happens automagically with the new | |
1677 | * implementation that only depends on the dcache stuff instead of | |
1678 | * using the inode layer | |
1679 | * | |
1680 | * Unfortunately, things are a little more complicated than indicated | |
1681 | * above. For a cross-directory move, we want to make sure we can get | |
1682 | * rid of the old inode after the operation. This means there must be | |
1683 | * no pending writes (if it's a file), and the use count must be 1. | |
1684 | * If these conditions are met, we can drop the dentries before doing | |
1685 | * the rename. | |
1686 | */ | |
1687 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1688 | struct inode *new_dir, struct dentry *new_dentry) | |
1689 | { | |
1690 | struct inode *old_inode = old_dentry->d_inode; | |
1691 | struct inode *new_inode = new_dentry->d_inode; | |
1692 | struct dentry *dentry = NULL, *rehash = NULL; | |
1693 | int error = -EBUSY; | |
1694 | ||
1da177e4 LT |
1695 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1696 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1697 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1698 | atomic_read(&new_dentry->d_count)); | |
1699 | ||
1700 | /* | |
28f79a1a MS |
1701 | * For non-directories, check whether the target is busy and if so, |
1702 | * make a copy of the dentry and then do a silly-rename. If the | |
1703 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1704 | * the new target. | |
1da177e4 | 1705 | */ |
27226104 MS |
1706 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1707 | /* | |
1708 | * To prevent any new references to the target during the | |
1709 | * rename, we unhash the dentry in advance. | |
1710 | */ | |
1711 | if (!d_unhashed(new_dentry)) { | |
1712 | d_drop(new_dentry); | |
1713 | rehash = new_dentry; | |
1714 | } | |
1da177e4 | 1715 | |
27226104 MS |
1716 | if (atomic_read(&new_dentry->d_count) > 2) { |
1717 | int err; | |
1718 | ||
1719 | /* copy the target dentry's name */ | |
1720 | dentry = d_alloc(new_dentry->d_parent, | |
1721 | &new_dentry->d_name); | |
1722 | if (!dentry) | |
1723 | goto out; | |
1724 | ||
1725 | /* silly-rename the existing target ... */ | |
1726 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1727 | if (err) |
27226104 | 1728 | goto out; |
24e93025 MS |
1729 | |
1730 | new_dentry = dentry; | |
56335936 | 1731 | rehash = NULL; |
24e93025 | 1732 | new_inode = NULL; |
27226104 | 1733 | } |
b1e4adf4 | 1734 | } |
1da177e4 | 1735 | |
cae7a073 | 1736 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1737 | if (new_inode != NULL) |
24174119 | 1738 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1739 | |
1da177e4 LT |
1740 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1741 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1742 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1743 | out: |
1744 | if (rehash) | |
1745 | d_rehash(rehash); | |
1746 | if (!error) { | |
b1e4adf4 TM |
1747 | if (new_inode != NULL) |
1748 | nfs_drop_nlink(new_inode); | |
349457cc | 1749 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1750 | nfs_set_verifier(new_dentry, |
1751 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1752 | } else if (error == -ENOENT) |
1753 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1754 | |
1755 | /* new dentry created? */ | |
1756 | if (dentry) | |
1757 | dput(dentry); | |
1da177e4 LT |
1758 | return error; |
1759 | } | |
1760 | ||
cfcea3e8 TM |
1761 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1762 | static LIST_HEAD(nfs_access_lru_list); | |
1763 | static atomic_long_t nfs_access_nr_entries; | |
1764 | ||
1c3c07e9 TM |
1765 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1766 | { | |
1767 | put_rpccred(entry->cred); | |
1768 | kfree(entry); | |
cfcea3e8 TM |
1769 | smp_mb__before_atomic_dec(); |
1770 | atomic_long_dec(&nfs_access_nr_entries); | |
1771 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1772 | } |
1773 | ||
1a81bb8a TM |
1774 | static void nfs_access_free_list(struct list_head *head) |
1775 | { | |
1776 | struct nfs_access_entry *cache; | |
1777 | ||
1778 | while (!list_empty(head)) { | |
1779 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1780 | list_del(&cache->lru); | |
1781 | nfs_access_free_entry(cache); | |
1782 | } | |
1783 | } | |
1784 | ||
7f8275d0 | 1785 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
1786 | { |
1787 | LIST_HEAD(head); | |
aa510da5 | 1788 | struct nfs_inode *nfsi, *next; |
979df72e TM |
1789 | struct nfs_access_entry *cache; |
1790 | ||
61d5eb29 TM |
1791 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1792 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1793 | |
a50f7951 | 1794 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1795 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1796 | struct inode *inode; |
1797 | ||
1798 | if (nr_to_scan-- == 0) | |
1799 | break; | |
9c7e7e23 | 1800 | inode = &nfsi->vfs_inode; |
979df72e TM |
1801 | spin_lock(&inode->i_lock); |
1802 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1803 | goto remove_lru_entry; | |
1804 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1805 | struct nfs_access_entry, lru); | |
1806 | list_move(&cache->lru, &head); | |
1807 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1808 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1809 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1810 | &nfs_access_lru_list); | |
1811 | else { | |
1812 | remove_lru_entry: | |
1813 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1814 | smp_mb__before_clear_bit(); |
979df72e | 1815 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1816 | smp_mb__after_clear_bit(); |
979df72e | 1817 | } |
59844a9b | 1818 | spin_unlock(&inode->i_lock); |
979df72e TM |
1819 | } |
1820 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1821 | nfs_access_free_list(&head); |
979df72e TM |
1822 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1823 | } | |
1824 | ||
1a81bb8a | 1825 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1826 | { |
1c3c07e9 | 1827 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1828 | struct rb_node *n; |
1c3c07e9 TM |
1829 | struct nfs_access_entry *entry; |
1830 | ||
1831 | /* Unhook entries from the cache */ | |
1832 | while ((n = rb_first(root_node)) != NULL) { | |
1833 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1834 | rb_erase(n, root_node); | |
1a81bb8a | 1835 | list_move(&entry->lru, head); |
1c3c07e9 TM |
1836 | } |
1837 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
1838 | } |
1839 | ||
1c3c07e9 | 1840 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1841 | { |
1a81bb8a TM |
1842 | LIST_HEAD(head); |
1843 | ||
1844 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
1845 | return; | |
cfcea3e8 | 1846 | /* Remove from global LRU init */ |
1a81bb8a TM |
1847 | spin_lock(&nfs_access_lru_lock); |
1848 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 1849 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 1850 | |
1c3c07e9 | 1851 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
1852 | __nfs_access_zap_cache(NFS_I(inode), &head); |
1853 | spin_unlock(&inode->i_lock); | |
1854 | spin_unlock(&nfs_access_lru_lock); | |
1855 | nfs_access_free_list(&head); | |
1c3c07e9 | 1856 | } |
1da177e4 | 1857 | |
1c3c07e9 TM |
1858 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
1859 | { | |
1860 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1861 | struct nfs_access_entry *entry; | |
1862 | ||
1863 | while (n != NULL) { | |
1864 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1865 | ||
1866 | if (cred < entry->cred) | |
1867 | n = n->rb_left; | |
1868 | else if (cred > entry->cred) | |
1869 | n = n->rb_right; | |
1870 | else | |
1871 | return entry; | |
1da177e4 | 1872 | } |
1c3c07e9 TM |
1873 | return NULL; |
1874 | } | |
1875 | ||
af22f94a | 1876 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
1877 | { |
1878 | struct nfs_inode *nfsi = NFS_I(inode); | |
1879 | struct nfs_access_entry *cache; | |
1880 | int err = -ENOENT; | |
1881 | ||
dc59250c | 1882 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
1883 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
1884 | goto out_zap; | |
1885 | cache = nfs_access_search_rbtree(inode, cred); | |
1886 | if (cache == NULL) | |
1887 | goto out; | |
b4d2314b | 1888 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 1889 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
1890 | goto out_stale; |
1891 | res->jiffies = cache->jiffies; | |
1892 | res->cred = cache->cred; | |
1893 | res->mask = cache->mask; | |
cfcea3e8 | 1894 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
1895 | err = 0; |
1896 | out: | |
1897 | spin_unlock(&inode->i_lock); | |
1898 | return err; | |
1899 | out_stale: | |
1900 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 1901 | list_del(&cache->lru); |
1c3c07e9 TM |
1902 | spin_unlock(&inode->i_lock); |
1903 | nfs_access_free_entry(cache); | |
1904 | return -ENOENT; | |
1905 | out_zap: | |
1a81bb8a TM |
1906 | spin_unlock(&inode->i_lock); |
1907 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
1908 | return -ENOENT; |
1909 | } | |
1910 | ||
1911 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
1912 | { | |
cfcea3e8 TM |
1913 | struct nfs_inode *nfsi = NFS_I(inode); |
1914 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
1915 | struct rb_node **p = &root_node->rb_node; |
1916 | struct rb_node *parent = NULL; | |
1917 | struct nfs_access_entry *entry; | |
1918 | ||
1919 | spin_lock(&inode->i_lock); | |
1920 | while (*p != NULL) { | |
1921 | parent = *p; | |
1922 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
1923 | ||
1924 | if (set->cred < entry->cred) | |
1925 | p = &parent->rb_left; | |
1926 | else if (set->cred > entry->cred) | |
1927 | p = &parent->rb_right; | |
1928 | else | |
1929 | goto found; | |
1930 | } | |
1931 | rb_link_node(&set->rb_node, parent, p); | |
1932 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 1933 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 1934 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
1935 | return; |
1936 | found: | |
1937 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
1938 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
1939 | list_del(&entry->lru); | |
1c3c07e9 TM |
1940 | spin_unlock(&inode->i_lock); |
1941 | nfs_access_free_entry(entry); | |
1942 | } | |
1943 | ||
af22f94a | 1944 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
1945 | { |
1946 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
1947 | if (cache == NULL) | |
1948 | return; | |
1949 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 1950 | cache->jiffies = set->jiffies; |
1c3c07e9 | 1951 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 1952 | cache->mask = set->mask; |
1c3c07e9 TM |
1953 | |
1954 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
1955 | |
1956 | /* Update accounting */ | |
1957 | smp_mb__before_atomic_inc(); | |
1958 | atomic_long_inc(&nfs_access_nr_entries); | |
1959 | smp_mb__after_atomic_inc(); | |
1960 | ||
1961 | /* Add inode to global LRU list */ | |
1a81bb8a | 1962 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 1963 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
1964 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
1965 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
1966 | &nfs_access_lru_list); | |
cfcea3e8 TM |
1967 | spin_unlock(&nfs_access_lru_lock); |
1968 | } | |
1da177e4 LT |
1969 | } |
1970 | ||
1971 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
1972 | { | |
1973 | struct nfs_access_entry cache; | |
1974 | int status; | |
1975 | ||
1976 | status = nfs_access_get_cached(inode, cred, &cache); | |
1977 | if (status == 0) | |
1978 | goto out; | |
1979 | ||
1980 | /* Be clever: ask server to check for all possible rights */ | |
1981 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
1982 | cache.cred = cred; | |
1983 | cache.jiffies = jiffies; | |
1984 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
1985 | if (status != 0) { |
1986 | if (status == -ESTALE) { | |
1987 | nfs_zap_caches(inode); | |
1988 | if (!S_ISDIR(inode->i_mode)) | |
1989 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
1990 | } | |
1da177e4 | 1991 | return status; |
a71ee337 | 1992 | } |
1da177e4 LT |
1993 | nfs_access_add_cache(inode, &cache); |
1994 | out: | |
e6305c43 | 1995 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
1996 | return 0; |
1997 | return -EACCES; | |
1998 | } | |
1999 | ||
af22f94a TM |
2000 | static int nfs_open_permission_mask(int openflags) |
2001 | { | |
2002 | int mask = 0; | |
2003 | ||
2004 | if (openflags & FMODE_READ) | |
2005 | mask |= MAY_READ; | |
2006 | if (openflags & FMODE_WRITE) | |
2007 | mask |= MAY_WRITE; | |
2008 | if (openflags & FMODE_EXEC) | |
2009 | mask |= MAY_EXEC; | |
2010 | return mask; | |
2011 | } | |
2012 | ||
2013 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2014 | { | |
2015 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2016 | } | |
2017 | ||
e6305c43 | 2018 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2019 | { |
2020 | struct rpc_cred *cred; | |
2021 | int res = 0; | |
2022 | ||
91d5b470 CL |
2023 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2024 | ||
e6305c43 | 2025 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2026 | goto out; |
2027 | /* Is this sys_access() ? */ | |
9cfcac81 | 2028 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2029 | goto force_lookup; |
2030 | ||
2031 | switch (inode->i_mode & S_IFMT) { | |
2032 | case S_IFLNK: | |
2033 | goto out; | |
2034 | case S_IFREG: | |
2035 | /* NFSv4 has atomic_open... */ | |
2036 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2037 | && (mask & MAY_OPEN) |
2038 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2039 | goto out; |
2040 | break; | |
2041 | case S_IFDIR: | |
2042 | /* | |
2043 | * Optimize away all write operations, since the server | |
2044 | * will check permissions when we perform the op. | |
2045 | */ | |
2046 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2047 | goto out; | |
2048 | } | |
2049 | ||
2050 | force_lookup: | |
1da177e4 LT |
2051 | if (!NFS_PROTO(inode)->access) |
2052 | goto out_notsup; | |
2053 | ||
98a8e323 | 2054 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2055 | if (!IS_ERR(cred)) { |
2056 | res = nfs_do_access(inode, cred, mask); | |
2057 | put_rpccred(cred); | |
2058 | } else | |
2059 | res = PTR_ERR(cred); | |
1da177e4 | 2060 | out: |
f696a365 MS |
2061 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2062 | res = -EACCES; | |
2063 | ||
1e7cb3dc CL |
2064 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2065 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2066 | return res; |
2067 | out_notsup: | |
2068 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2069 | if (res == 0) | |
2070 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 2071 | goto out; |
1da177e4 LT |
2072 | } |
2073 | ||
2074 | /* | |
2075 | * Local variables: | |
2076 | * version-control: t | |
2077 | * kept-new-versions: 5 | |
2078 | * End: | |
2079 | */ |