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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
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> | |
32 | #include <linux/smp_lock.h> | |
873101b3 | 33 | #include <linux/pagevec.h> |
1da177e4 | 34 | #include <linux/namei.h> |
54ceac45 | 35 | #include <linux/mount.h> |
e8edc6e0 | 36 | #include <linux/sched.h> |
1da177e4 | 37 | |
4ce79717 | 38 | #include "nfs4_fs.h" |
1da177e4 | 39 | #include "delegation.h" |
91d5b470 | 40 | #include "iostat.h" |
4c30d56e | 41 | #include "internal.h" |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* #define NFS_DEBUG_VERBOSE 1 */ |
44 | ||
45 | static int nfs_opendir(struct inode *, struct file *); | |
46 | static int nfs_readdir(struct file *, void *, filldir_t); | |
47 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
48 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
49 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
50 | static int nfs_rmdir(struct inode *, struct dentry *); | |
51 | static int nfs_unlink(struct inode *, struct dentry *); | |
52 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
53 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
54 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
55 | static int nfs_rename(struct inode *, struct dentry *, | |
56 | struct inode *, struct dentry *); | |
57 | static int nfs_fsync_dir(struct file *, struct dentry *, int); | |
f0dd2136 | 58 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
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 | ||
b7fa0554 | 84 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 85 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
86 | .create = nfs_create, |
87 | .lookup = nfs_lookup, | |
88 | .link = nfs_link, | |
89 | .unlink = nfs_unlink, | |
90 | .symlink = nfs_symlink, | |
91 | .mkdir = nfs_mkdir, | |
92 | .rmdir = nfs_rmdir, | |
93 | .mknod = nfs_mknod, | |
94 | .rename = nfs_rename, | |
95 | .permission = nfs_permission, | |
96 | .getattr = nfs_getattr, | |
97 | .setattr = nfs_setattr, | |
98 | .listxattr = nfs3_listxattr, | |
99 | .getxattr = nfs3_getxattr, | |
100 | .setxattr = nfs3_setxattr, | |
101 | .removexattr = nfs3_removexattr, | |
102 | }; | |
103 | #endif /* CONFIG_NFS_V3 */ | |
104 | ||
1da177e4 LT |
105 | #ifdef CONFIG_NFS_V4 |
106 | ||
107 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
92e1d5be | 108 | const struct inode_operations nfs4_dir_inode_operations = { |
1da177e4 LT |
109 | .create = nfs_create, |
110 | .lookup = nfs_atomic_lookup, | |
111 | .link = nfs_link, | |
112 | .unlink = nfs_unlink, | |
113 | .symlink = nfs_symlink, | |
114 | .mkdir = nfs_mkdir, | |
115 | .rmdir = nfs_rmdir, | |
116 | .mknod = nfs_mknod, | |
117 | .rename = nfs_rename, | |
118 | .permission = nfs_permission, | |
119 | .getattr = nfs_getattr, | |
120 | .setattr = nfs_setattr, | |
6b3b5496 BF |
121 | .getxattr = nfs4_getxattr, |
122 | .setxattr = nfs4_setxattr, | |
123 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
124 | }; |
125 | ||
126 | #endif /* CONFIG_NFS_V4 */ | |
127 | ||
128 | /* | |
129 | * Open file | |
130 | */ | |
131 | static int | |
132 | nfs_opendir(struct inode *inode, struct file *filp) | |
133 | { | |
7451c4f0 | 134 | int res; |
1da177e4 | 135 | |
6da24bc9 | 136 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
137 | filp->f_path.dentry->d_parent->d_name.name, |
138 | filp->f_path.dentry->d_name.name); | |
139 | ||
140 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 141 | |
1da177e4 | 142 | /* Call generic open code in order to cache credentials */ |
7451c4f0 | 143 | res = nfs_open(inode, filp); |
1da177e4 LT |
144 | return res; |
145 | } | |
146 | ||
0dbb4c67 | 147 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
1da177e4 LT |
148 | typedef struct { |
149 | struct file *file; | |
150 | struct page *page; | |
151 | unsigned long page_index; | |
0dbb4c67 | 152 | __be32 *ptr; |
f0dd2136 TM |
153 | u64 *dir_cookie; |
154 | loff_t current_index; | |
1da177e4 LT |
155 | struct nfs_entry *entry; |
156 | decode_dirent_t decode; | |
157 | int plus; | |
1f4eab7e NB |
158 | unsigned long timestamp; |
159 | int timestamp_valid; | |
1da177e4 LT |
160 | } nfs_readdir_descriptor_t; |
161 | ||
162 | /* Now we cache directories properly, by stuffing the dirent | |
163 | * data directly in the page cache. | |
164 | * | |
165 | * Inode invalidation due to refresh etc. takes care of | |
166 | * _everything_, no sloppy entry flushing logic, no extraneous | |
167 | * copying, network direct to page cache, the way it was meant | |
168 | * to be. | |
169 | * | |
170 | * NOTE: Dirent information verification is done always by the | |
171 | * page-in of the RPC reply, nowhere else, this simplies | |
172 | * things substantially. | |
173 | */ | |
174 | static | |
175 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) | |
176 | { | |
177 | struct file *file = desc->file; | |
01cce933 | 178 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
179 | struct rpc_cred *cred = nfs_file_cred(file); |
180 | unsigned long timestamp; | |
181 | int error; | |
182 | ||
1e7cb3dc | 183 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
3110ff80 | 184 | __func__, (long long)desc->entry->cookie, |
1e7cb3dc | 185 | page->index); |
1da177e4 LT |
186 | |
187 | again: | |
188 | timestamp = jiffies; | |
01cce933 | 189 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, desc->entry->cookie, page, |
1da177e4 LT |
190 | NFS_SERVER(inode)->dtsize, desc->plus); |
191 | if (error < 0) { | |
192 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
193 | if (error == -ENOTSUPP && desc->plus) { | |
194 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 195 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
196 | desc->plus = 0; |
197 | goto again; | |
198 | } | |
199 | goto error; | |
200 | } | |
1f4eab7e NB |
201 | desc->timestamp = timestamp; |
202 | desc->timestamp_valid = 1; | |
1da177e4 | 203 | SetPageUptodate(page); |
1da177e4 LT |
204 | /* Ensure consistent page alignment of the data. |
205 | * Note: assumes we have exclusive access to this mapping either | |
1b1dcc1b | 206 | * through inode->i_mutex or some other mechanism. |
1da177e4 | 207 | */ |
2aac05a9 | 208 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
cd9ae2b6 TM |
209 | /* Should never happen */ |
210 | nfs_zap_mapping(inode, inode->i_mapping); | |
211 | } | |
1da177e4 LT |
212 | unlock_page(page); |
213 | return 0; | |
214 | error: | |
1da177e4 | 215 | unlock_page(page); |
1da177e4 LT |
216 | return -EIO; |
217 | } | |
218 | ||
219 | static inline | |
220 | int dir_decode(nfs_readdir_descriptor_t *desc) | |
221 | { | |
0dbb4c67 | 222 | __be32 *p = desc->ptr; |
1da177e4 LT |
223 | p = desc->decode(p, desc->entry, desc->plus); |
224 | if (IS_ERR(p)) | |
225 | return PTR_ERR(p); | |
226 | desc->ptr = p; | |
1f4eab7e NB |
227 | if (desc->timestamp_valid) |
228 | desc->entry->fattr->time_start = desc->timestamp; | |
229 | else | |
230 | desc->entry->fattr->valid &= ~NFS_ATTR_FATTR; | |
1da177e4 LT |
231 | return 0; |
232 | } | |
233 | ||
234 | static inline | |
235 | void dir_page_release(nfs_readdir_descriptor_t *desc) | |
236 | { | |
237 | kunmap(desc->page); | |
238 | page_cache_release(desc->page); | |
239 | desc->page = NULL; | |
240 | desc->ptr = NULL; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Given a pointer to a buffer that has already been filled by a call | |
f0dd2136 | 245 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
1da177e4 LT |
246 | * |
247 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
248 | * return the offset within the buffer of the next entry to be | |
249 | * read. | |
250 | */ | |
251 | static inline | |
00a92642 | 252 | int find_dirent(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
253 | { |
254 | struct nfs_entry *entry = desc->entry; | |
255 | int loop_count = 0, | |
256 | status; | |
257 | ||
258 | while((status = dir_decode(desc)) == 0) { | |
1e7cb3dc | 259 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
3110ff80 | 260 | __func__, (unsigned long long)entry->cookie); |
f0dd2136 | 261 | if (entry->prev_cookie == *desc->dir_cookie) |
1da177e4 LT |
262 | break; |
263 | if (loop_count++ > 200) { | |
264 | loop_count = 0; | |
265 | schedule(); | |
266 | } | |
267 | } | |
1da177e4 LT |
268 | return status; |
269 | } | |
270 | ||
271 | /* | |
00a92642 | 272 | * Given a pointer to a buffer that has already been filled by a call |
f0dd2136 | 273 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
00a92642 OG |
274 | * |
275 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
276 | * return the offset within the buffer of the next entry to be | |
277 | * read. | |
278 | */ | |
279 | static inline | |
280 | int find_dirent_index(nfs_readdir_descriptor_t *desc) | |
281 | { | |
282 | struct nfs_entry *entry = desc->entry; | |
283 | int loop_count = 0, | |
284 | status; | |
285 | ||
286 | for(;;) { | |
287 | status = dir_decode(desc); | |
288 | if (status) | |
289 | break; | |
290 | ||
1e7cb3dc CL |
291 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
292 | (unsigned long long)entry->cookie, desc->current_index); | |
00a92642 | 293 | |
f0dd2136 TM |
294 | if (desc->file->f_pos == desc->current_index) { |
295 | *desc->dir_cookie = entry->cookie; | |
00a92642 OG |
296 | break; |
297 | } | |
298 | desc->current_index++; | |
299 | if (loop_count++ > 200) { | |
300 | loop_count = 0; | |
301 | schedule(); | |
302 | } | |
303 | } | |
00a92642 OG |
304 | return status; |
305 | } | |
306 | ||
307 | /* | |
308 | * Find the given page, and call find_dirent() or find_dirent_index in | |
309 | * order to try to return the next entry. | |
1da177e4 LT |
310 | */ |
311 | static inline | |
312 | int find_dirent_page(nfs_readdir_descriptor_t *desc) | |
313 | { | |
01cce933 | 314 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 LT |
315 | struct page *page; |
316 | int status; | |
317 | ||
1e7cb3dc | 318 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
3110ff80 | 319 | __func__, desc->page_index, |
1e7cb3dc | 320 | (long long) *desc->dir_cookie); |
1da177e4 | 321 | |
1f4eab7e NB |
322 | /* If we find the page in the page_cache, we cannot be sure |
323 | * how fresh the data is, so we will ignore readdir_plus attributes. | |
324 | */ | |
325 | desc->timestamp_valid = 0; | |
1da177e4 LT |
326 | page = read_cache_page(inode->i_mapping, desc->page_index, |
327 | (filler_t *)nfs_readdir_filler, desc); | |
328 | if (IS_ERR(page)) { | |
329 | status = PTR_ERR(page); | |
330 | goto out; | |
331 | } | |
1da177e4 LT |
332 | |
333 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ | |
334 | desc->page = page; | |
335 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
f0dd2136 | 336 | if (*desc->dir_cookie != 0) |
00a92642 OG |
337 | status = find_dirent(desc); |
338 | else | |
339 | status = find_dirent_index(desc); | |
1da177e4 LT |
340 | if (status < 0) |
341 | dir_page_release(desc); | |
342 | out: | |
3110ff80 | 343 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status); |
1da177e4 | 344 | return status; |
1da177e4 LT |
345 | } |
346 | ||
347 | /* | |
348 | * Recurse through the page cache pages, and return a | |
349 | * filled nfs_entry structure of the next directory entry if possible. | |
350 | * | |
f0dd2136 TM |
351 | * The target for the search is '*desc->dir_cookie' if non-0, |
352 | * 'desc->file->f_pos' otherwise | |
1da177e4 LT |
353 | */ |
354 | static inline | |
355 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
356 | { | |
357 | int loop_count = 0; | |
358 | int res; | |
359 | ||
00a92642 | 360 | /* Always search-by-index from the beginning of the cache */ |
f0dd2136 | 361 | if (*desc->dir_cookie == 0) { |
1e7cb3dc CL |
362 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
363 | (long long)desc->file->f_pos); | |
00a92642 OG |
364 | desc->page_index = 0; |
365 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
366 | desc->entry->eof = 0; | |
367 | desc->current_index = 0; | |
f0dd2136 | 368 | } else |
1e7cb3dc CL |
369 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
370 | (unsigned long long)*desc->dir_cookie); | |
00a92642 | 371 | |
1da177e4 LT |
372 | for (;;) { |
373 | res = find_dirent_page(desc); | |
374 | if (res != -EAGAIN) | |
375 | break; | |
376 | /* Align to beginning of next page */ | |
377 | desc->page_index ++; | |
378 | if (loop_count++ > 200) { | |
379 | loop_count = 0; | |
380 | schedule(); | |
381 | } | |
382 | } | |
1e7cb3dc | 383 | |
3110ff80 | 384 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, res); |
1da177e4 LT |
385 | return res; |
386 | } | |
387 | ||
388 | static inline unsigned int dt_type(struct inode *inode) | |
389 | { | |
390 | return (inode->i_mode >> 12) & 15; | |
391 | } | |
392 | ||
393 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); | |
394 | ||
395 | /* | |
396 | * Once we've found the start of the dirent within a page: fill 'er up... | |
397 | */ | |
398 | static | |
399 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
400 | filldir_t filldir) | |
401 | { | |
402 | struct file *file = desc->file; | |
403 | struct nfs_entry *entry = desc->entry; | |
404 | struct dentry *dentry = NULL; | |
4e769b93 | 405 | u64 fileid; |
1da177e4 LT |
406 | int loop_count = 0, |
407 | res; | |
408 | ||
1e7cb3dc CL |
409 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
410 | (unsigned long long)entry->cookie); | |
1da177e4 LT |
411 | |
412 | for(;;) { | |
413 | unsigned d_type = DT_UNKNOWN; | |
414 | /* Note: entry->prev_cookie contains the cookie for | |
415 | * retrieving the current dirent on the server */ | |
4e769b93 | 416 | fileid = entry->ino; |
1da177e4 LT |
417 | |
418 | /* Get a dentry if we have one */ | |
419 | if (dentry != NULL) | |
420 | dput(dentry); | |
421 | dentry = nfs_readdir_lookup(desc); | |
422 | ||
423 | /* Use readdirplus info */ | |
424 | if (dentry != NULL && dentry->d_inode != NULL) { | |
425 | d_type = dt_type(dentry->d_inode); | |
4e769b93 | 426 | fileid = NFS_FILEID(dentry->d_inode); |
1da177e4 LT |
427 | } |
428 | ||
429 | res = filldir(dirent, entry->name, entry->len, | |
f43bf0be TM |
430 | file->f_pos, nfs_compat_user_ino64(fileid), |
431 | d_type); | |
1da177e4 LT |
432 | if (res < 0) |
433 | break; | |
00a92642 | 434 | file->f_pos++; |
f0dd2136 | 435 | *desc->dir_cookie = entry->cookie; |
1da177e4 LT |
436 | if (dir_decode(desc) != 0) { |
437 | desc->page_index ++; | |
438 | break; | |
439 | } | |
440 | if (loop_count++ > 200) { | |
441 | loop_count = 0; | |
442 | schedule(); | |
443 | } | |
444 | } | |
445 | dir_page_release(desc); | |
446 | if (dentry != NULL) | |
447 | dput(dentry); | |
1e7cb3dc CL |
448 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
449 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
450 | return res; |
451 | } | |
452 | ||
453 | /* | |
454 | * If we cannot find a cookie in our cache, we suspect that this is | |
455 | * because it points to a deleted file, so we ask the server to return | |
456 | * whatever it thinks is the next entry. We then feed this to filldir. | |
457 | * If all goes well, we should then be able to find our way round the | |
458 | * cache on the next call to readdir_search_pagecache(); | |
459 | * | |
460 | * NOTE: we cannot add the anonymous page to the pagecache because | |
461 | * the data it contains might not be page aligned. Besides, | |
462 | * we should already have a complete representation of the | |
463 | * directory in the page cache by the time we get here. | |
464 | */ | |
465 | static inline | |
466 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
467 | filldir_t filldir) | |
468 | { | |
469 | struct file *file = desc->file; | |
01cce933 | 470 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
471 | struct rpc_cred *cred = nfs_file_cred(file); |
472 | struct page *page = NULL; | |
473 | int status; | |
1f4eab7e | 474 | unsigned long timestamp; |
1da177e4 | 475 | |
1e7cb3dc CL |
476 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
477 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
478 | |
479 | page = alloc_page(GFP_HIGHUSER); | |
480 | if (!page) { | |
481 | status = -ENOMEM; | |
482 | goto out; | |
483 | } | |
1f4eab7e | 484 | timestamp = jiffies; |
25606656 JL |
485 | status = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, |
486 | *desc->dir_cookie, page, | |
1da177e4 LT |
487 | NFS_SERVER(inode)->dtsize, |
488 | desc->plus); | |
1da177e4 LT |
489 | desc->page = page; |
490 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
25606656 | 491 | if (status >= 0) { |
1f4eab7e NB |
492 | desc->timestamp = timestamp; |
493 | desc->timestamp_valid = 1; | |
1da177e4 | 494 | if ((status = dir_decode(desc)) == 0) |
f0dd2136 | 495 | desc->entry->prev_cookie = *desc->dir_cookie; |
1da177e4 LT |
496 | } else |
497 | status = -EIO; | |
498 | if (status < 0) | |
499 | goto out_release; | |
500 | ||
501 | status = nfs_do_filldir(desc, dirent, filldir); | |
502 | ||
503 | /* Reset read descriptor so it searches the page cache from | |
504 | * the start upon the next call to readdir_search_pagecache() */ | |
505 | desc->page_index = 0; | |
506 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
507 | desc->entry->eof = 0; | |
508 | out: | |
1e7cb3dc | 509 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 510 | __func__, status); |
1da177e4 LT |
511 | return status; |
512 | out_release: | |
513 | dir_page_release(desc); | |
514 | goto out; | |
515 | } | |
516 | ||
00a92642 OG |
517 | /* The file offset position represents the dirent entry number. A |
518 | last cookie cache takes care of the common case of reading the | |
519 | whole directory. | |
1da177e4 LT |
520 | */ |
521 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
522 | { | |
01cce933 | 523 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
524 | struct inode *inode = dentry->d_inode; |
525 | nfs_readdir_descriptor_t my_desc, | |
526 | *desc = &my_desc; | |
527 | struct nfs_entry my_entry; | |
528 | struct nfs_fh fh; | |
529 | struct nfs_fattr fattr; | |
530 | long res; | |
531 | ||
6da24bc9 | 532 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
533 | dentry->d_parent->d_name.name, dentry->d_name.name, |
534 | (long long)filp->f_pos); | |
91d5b470 CL |
535 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
536 | ||
1da177e4 LT |
537 | lock_kernel(); |
538 | ||
1da177e4 | 539 | /* |
00a92642 | 540 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 541 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
542 | * to either find the entry with the appropriate number or |
543 | * revalidate the cookie. | |
1da177e4 LT |
544 | */ |
545 | memset(desc, 0, sizeof(*desc)); | |
546 | ||
547 | desc->file = filp; | |
cd3758e3 | 548 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
549 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
550 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
551 | ||
552 | my_entry.cookie = my_entry.prev_cookie = 0; | |
553 | my_entry.eof = 0; | |
554 | my_entry.fh = &fh; | |
555 | my_entry.fattr = &fattr; | |
0e574af1 | 556 | nfs_fattr_init(&fattr); |
1da177e4 LT |
557 | desc->entry = &my_entry; |
558 | ||
565277f6 | 559 | nfs_block_sillyrename(dentry); |
fccca7fc TM |
560 | res = nfs_revalidate_mapping_nolock(inode, filp->f_mapping); |
561 | if (res < 0) | |
562 | goto out; | |
563 | ||
1da177e4 LT |
564 | while(!desc->entry->eof) { |
565 | res = readdir_search_pagecache(desc); | |
00a92642 | 566 | |
1da177e4 LT |
567 | if (res == -EBADCOOKIE) { |
568 | /* This means either end of directory */ | |
f0dd2136 | 569 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
1da177e4 LT |
570 | /* Or that the server has 'lost' a cookie */ |
571 | res = uncached_readdir(desc, dirent, filldir); | |
572 | if (res >= 0) | |
573 | continue; | |
574 | } | |
575 | res = 0; | |
576 | break; | |
577 | } | |
578 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 579 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
580 | nfs_zap_caches(inode); |
581 | desc->plus = 0; | |
582 | desc->entry->eof = 0; | |
583 | continue; | |
584 | } | |
585 | if (res < 0) | |
586 | break; | |
587 | ||
588 | res = nfs_do_filldir(desc, dirent, filldir); | |
589 | if (res < 0) { | |
590 | res = 0; | |
591 | break; | |
592 | } | |
593 | } | |
fccca7fc | 594 | out: |
565277f6 | 595 | nfs_unblock_sillyrename(dentry); |
1da177e4 | 596 | unlock_kernel(); |
1e7cb3dc CL |
597 | if (res > 0) |
598 | res = 0; | |
6da24bc9 | 599 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %ld\n", |
1e7cb3dc CL |
600 | dentry->d_parent->d_name.name, dentry->d_name.name, |
601 | res); | |
602 | return res; | |
1da177e4 LT |
603 | } |
604 | ||
10afec90 | 605 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 606 | { |
b84e06c5 CL |
607 | struct dentry *dentry = filp->f_path.dentry; |
608 | struct inode *inode = dentry->d_inode; | |
609 | ||
6da24bc9 | 610 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
611 | dentry->d_parent->d_name.name, |
612 | dentry->d_name.name, | |
613 | offset, origin); | |
614 | ||
615 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
616 | switch (origin) { |
617 | case 1: | |
618 | offset += filp->f_pos; | |
619 | case 0: | |
620 | if (offset >= 0) | |
621 | break; | |
622 | default: | |
623 | offset = -EINVAL; | |
624 | goto out; | |
625 | } | |
626 | if (offset != filp->f_pos) { | |
627 | filp->f_pos = offset; | |
cd3758e3 | 628 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
629 | } |
630 | out: | |
b84e06c5 | 631 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
632 | return offset; |
633 | } | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * All directory operations under NFS are synchronous, so fsync() | |
637 | * is a dummy operation. | |
638 | */ | |
10afec90 | 639 | static int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync) |
1da177e4 | 640 | { |
6da24bc9 | 641 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
642 | dentry->d_parent->d_name.name, dentry->d_name.name, |
643 | datasync); | |
644 | ||
54917786 | 645 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
646 | return 0; |
647 | } | |
648 | ||
bfc69a45 TM |
649 | /** |
650 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
651 | * @dir - pointer to directory inode | |
652 | * | |
653 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
654 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
655 | * on the server that might have invalidated our dcache. | |
656 | * | |
657 | * The caller should be holding dir->i_lock | |
658 | */ | |
659 | void nfs_force_lookup_revalidate(struct inode *dir) | |
660 | { | |
661 | NFS_I(dir)->cache_change_attribute = jiffies; | |
662 | } | |
663 | ||
1da177e4 LT |
664 | /* |
665 | * A check for whether or not the parent directory has changed. | |
666 | * In the case it has, we assume that the dentries are untrustworthy | |
667 | * and may need to be looked up again. | |
668 | */ | |
c79ba787 | 669 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
670 | { |
671 | if (IS_ROOT(dentry)) | |
672 | return 1; | |
f2c77f4e TM |
673 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
674 | return 0; | |
675 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
676 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
677 | return 0; | |
678 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
679 | return 0; | |
680 | return 1; | |
1da177e4 LT |
681 | } |
682 | ||
1d6757fb TM |
683 | /* |
684 | * Return the intent data that applies to this particular path component | |
685 | * | |
686 | * Note that the current set of intents only apply to the very last | |
687 | * component of the path. | |
688 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
689 | */ | |
690 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
691 | { | |
692 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
693 | return 0; | |
694 | return nd->flags & mask; | |
695 | } | |
696 | ||
a12802ca TM |
697 | /* |
698 | * Use intent information to check whether or not we're going to do | |
699 | * an O_EXCL create using this path component. | |
700 | */ | |
701 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
702 | { | |
703 | if (NFS_PROTO(dir)->version == 2) | |
704 | return 0; | |
705 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) | |
706 | return 0; | |
707 | return (nd->intent.open.flags & O_EXCL) != 0; | |
708 | } | |
709 | ||
1d6757fb TM |
710 | /* |
711 | * Inode and filehandle revalidation for lookups. | |
712 | * | |
713 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
714 | * or if the intent information indicates that we're about to open this | |
715 | * particular file and the "nocto" mount flag is not set. | |
716 | * | |
717 | */ | |
1da177e4 LT |
718 | static inline |
719 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
720 | { | |
721 | struct nfs_server *server = NFS_SERVER(inode); | |
722 | ||
4e99a1ff TM |
723 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
724 | return 0; | |
1da177e4 | 725 | if (nd != NULL) { |
1da177e4 | 726 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 727 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
728 | goto out_force; |
729 | /* This is an open(2) */ | |
1d6757fb | 730 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
731 | !(server->flags & NFS_MOUNT_NOCTO) && |
732 | (S_ISREG(inode->i_mode) || | |
733 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 734 | goto out_force; |
4f48af45 | 735 | return 0; |
1da177e4 LT |
736 | } |
737 | return nfs_revalidate_inode(server, inode); | |
738 | out_force: | |
739 | return __nfs_revalidate_inode(server, inode); | |
740 | } | |
741 | ||
742 | /* | |
743 | * We judge how long we want to trust negative | |
744 | * dentries by looking at the parent inode mtime. | |
745 | * | |
746 | * If parent mtime has changed, we revalidate, else we wait for a | |
747 | * period corresponding to the parent's attribute cache timeout value. | |
748 | */ | |
749 | static inline | |
750 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
751 | struct nameidata *nd) | |
752 | { | |
1da177e4 | 753 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 754 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 LT |
755 | return 0; |
756 | return !nfs_check_verifier(dir, dentry); | |
757 | } | |
758 | ||
759 | /* | |
760 | * This is called every time the dcache has a lookup hit, | |
761 | * and we should check whether we can really trust that | |
762 | * lookup. | |
763 | * | |
764 | * NOTE! The hit can be a negative hit too, don't assume | |
765 | * we have an inode! | |
766 | * | |
767 | * If the parent directory is seen to have changed, we throw out the | |
768 | * cached dentry and do a new lookup. | |
769 | */ | |
770 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
771 | { | |
772 | struct inode *dir; | |
773 | struct inode *inode; | |
774 | struct dentry *parent; | |
775 | int error; | |
776 | struct nfs_fh fhandle; | |
777 | struct nfs_fattr fattr; | |
1da177e4 LT |
778 | |
779 | parent = dget_parent(dentry); | |
780 | lock_kernel(); | |
781 | dir = parent->d_inode; | |
91d5b470 | 782 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
783 | inode = dentry->d_inode; |
784 | ||
785 | if (!inode) { | |
786 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
787 | goto out_bad; | |
788 | goto out_valid; | |
789 | } | |
790 | ||
791 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 792 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 793 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 794 | dentry->d_name.name); |
1da177e4 LT |
795 | goto out_bad; |
796 | } | |
797 | ||
1da177e4 | 798 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 799 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
800 | if (nfs_lookup_verify_inode(inode, nd)) |
801 | goto out_zap_parent; | |
802 | goto out_valid; | |
803 | } | |
804 | ||
805 | if (NFS_STALE(inode)) | |
806 | goto out_bad; | |
807 | ||
1da177e4 LT |
808 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
809 | if (error) | |
810 | goto out_bad; | |
811 | if (nfs_compare_fh(NFS_FH(inode), &fhandle)) | |
812 | goto out_bad; | |
813 | if ((error = nfs_refresh_inode(inode, &fattr)) != 0) | |
814 | goto out_bad; | |
815 | ||
cf8ba45e | 816 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
817 | out_valid: |
818 | unlock_kernel(); | |
819 | dput(parent); | |
1e7cb3dc | 820 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 821 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 822 | dentry->d_name.name); |
1da177e4 LT |
823 | return 1; |
824 | out_zap_parent: | |
825 | nfs_zap_caches(dir); | |
826 | out_bad: | |
a1643a92 | 827 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
828 | if (inode && S_ISDIR(inode->i_mode)) { |
829 | /* Purge readdir caches. */ | |
830 | nfs_zap_caches(inode); | |
831 | /* If we have submounts, don't unhash ! */ | |
832 | if (have_submounts(dentry)) | |
833 | goto out_valid; | |
834 | shrink_dcache_parent(dentry); | |
835 | } | |
836 | d_drop(dentry); | |
837 | unlock_kernel(); | |
838 | dput(parent); | |
1e7cb3dc | 839 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 840 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 841 | dentry->d_name.name); |
1da177e4 LT |
842 | return 0; |
843 | } | |
844 | ||
845 | /* | |
846 | * This is called from dput() when d_count is going to 0. | |
847 | */ | |
848 | static int nfs_dentry_delete(struct dentry *dentry) | |
849 | { | |
850 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
851 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
852 | dentry->d_flags); | |
853 | ||
77f11192 TM |
854 | /* Unhash any dentry with a stale inode */ |
855 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
856 | return 1; | |
857 | ||
1da177e4 LT |
858 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
859 | /* Unhash it, so that ->d_iput() would be called */ | |
860 | return 1; | |
861 | } | |
862 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
863 | /* Unhash it, so that ancestors of killed async unlink | |
864 | * files will be cleaned up during umount */ | |
865 | return 1; | |
866 | } | |
867 | return 0; | |
868 | ||
869 | } | |
870 | ||
1b83d707 TM |
871 | static void nfs_drop_nlink(struct inode *inode) |
872 | { | |
873 | spin_lock(&inode->i_lock); | |
874 | if (inode->i_nlink > 0) | |
875 | drop_nlink(inode); | |
876 | spin_unlock(&inode->i_lock); | |
877 | } | |
878 | ||
1da177e4 LT |
879 | /* |
880 | * Called when the dentry loses inode. | |
881 | * We use it to clean up silly-renamed files. | |
882 | */ | |
883 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
884 | { | |
83672d39 NB |
885 | if (S_ISDIR(inode->i_mode)) |
886 | /* drop any readdir cache as it could easily be old */ | |
887 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
888 | ||
1da177e4 LT |
889 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
890 | lock_kernel(); | |
9a53c3a7 | 891 | drop_nlink(inode); |
e4eff1a6 | 892 | nfs_complete_unlink(dentry, inode); |
1da177e4 LT |
893 | unlock_kernel(); |
894 | } | |
1da177e4 LT |
895 | iput(inode); |
896 | } | |
897 | ||
898 | struct dentry_operations nfs_dentry_operations = { | |
899 | .d_revalidate = nfs_lookup_revalidate, | |
900 | .d_delete = nfs_dentry_delete, | |
901 | .d_iput = nfs_dentry_iput, | |
902 | }; | |
903 | ||
1da177e4 LT |
904 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
905 | { | |
906 | struct dentry *res; | |
565277f6 | 907 | struct dentry *parent; |
1da177e4 LT |
908 | struct inode *inode = NULL; |
909 | int error; | |
910 | struct nfs_fh fhandle; | |
911 | struct nfs_fattr fattr; | |
912 | ||
913 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
914 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 915 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
916 | |
917 | res = ERR_PTR(-ENAMETOOLONG); | |
918 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
919 | goto out; | |
920 | ||
921 | res = ERR_PTR(-ENOMEM); | |
922 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
923 | ||
924 | lock_kernel(); | |
1da177e4 | 925 | |
fd684071 TM |
926 | /* |
927 | * If we're doing an exclusive create, optimize away the lookup | |
928 | * but don't hash the dentry. | |
929 | */ | |
930 | if (nfs_is_exclusive_create(dir, nd)) { | |
931 | d_instantiate(dentry, NULL); | |
932 | res = NULL; | |
933 | goto out_unlock; | |
934 | } | |
1da177e4 | 935 | |
565277f6 TM |
936 | parent = dentry->d_parent; |
937 | /* Protect against concurrent sillydeletes */ | |
938 | nfs_block_sillyrename(parent); | |
1da177e4 LT |
939 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
940 | if (error == -ENOENT) | |
941 | goto no_entry; | |
942 | if (error < 0) { | |
943 | res = ERR_PTR(error); | |
565277f6 | 944 | goto out_unblock_sillyrename; |
1da177e4 | 945 | } |
1da177e4 | 946 | inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr); |
03f28e3a TM |
947 | res = (struct dentry *)inode; |
948 | if (IS_ERR(res)) | |
565277f6 | 949 | goto out_unblock_sillyrename; |
54ceac45 | 950 | |
1da177e4 | 951 | no_entry: |
54ceac45 | 952 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
953 | if (res != NULL) { |
954 | if (IS_ERR(res)) | |
565277f6 | 955 | goto out_unblock_sillyrename; |
1da177e4 | 956 | dentry = res; |
9eaef27b | 957 | } |
1da177e4 | 958 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
959 | out_unblock_sillyrename: |
960 | nfs_unblock_sillyrename(parent); | |
1da177e4 LT |
961 | out_unlock: |
962 | unlock_kernel(); | |
963 | out: | |
964 | return res; | |
965 | } | |
966 | ||
967 | #ifdef CONFIG_NFS_V4 | |
968 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
969 | ||
970 | struct dentry_operations nfs4_dentry_operations = { | |
971 | .d_revalidate = nfs_open_revalidate, | |
972 | .d_delete = nfs_dentry_delete, | |
973 | .d_iput = nfs_dentry_iput, | |
974 | }; | |
975 | ||
1d6757fb TM |
976 | /* |
977 | * Use intent information to determine whether we need to substitute | |
978 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
979 | */ | |
1da177e4 LT |
980 | static int is_atomic_open(struct inode *dir, struct nameidata *nd) |
981 | { | |
1d6757fb | 982 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
983 | return 0; |
984 | /* NFS does not (yet) have a stateful open for directories */ | |
985 | if (nd->flags & LOOKUP_DIRECTORY) | |
986 | return 0; | |
987 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
988 | if (__mnt_is_readonly(nd->path.mnt) && |
989 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
990 | return 0; |
991 | return 1; | |
992 | } | |
993 | ||
994 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
995 | { | |
996 | struct dentry *res = NULL; | |
1da177e4 LT |
997 | int error; |
998 | ||
1e7cb3dc CL |
999 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1000 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1001 | ||
1da177e4 LT |
1002 | /* Check that we are indeed trying to open this file */ |
1003 | if (!is_atomic_open(dir, nd)) | |
1004 | goto no_open; | |
1005 | ||
1006 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1007 | res = ERR_PTR(-ENAMETOOLONG); | |
1008 | goto out; | |
1009 | } | |
1010 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1011 | ||
d4d9cdcb TM |
1012 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1013 | * the dentry. */ | |
02a913a7 | 1014 | if (nd->intent.open.flags & O_EXCL) { |
d4d9cdcb | 1015 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1016 | goto out; |
1017 | } | |
1da177e4 LT |
1018 | |
1019 | /* Open the file on the server */ | |
60ccd4ec | 1020 | res = nfs4_atomic_open(dir, dentry, nd); |
02a913a7 TM |
1021 | if (IS_ERR(res)) { |
1022 | error = PTR_ERR(res); | |
1da177e4 LT |
1023 | switch (error) { |
1024 | /* Make a negative dentry */ | |
1025 | case -ENOENT: | |
02a913a7 TM |
1026 | res = NULL; |
1027 | goto out; | |
1da177e4 | 1028 | /* This turned out not to be a regular file */ |
6f926b5b TM |
1029 | case -EISDIR: |
1030 | case -ENOTDIR: | |
1031 | goto no_open; | |
1da177e4 LT |
1032 | case -ELOOP: |
1033 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1034 | goto no_open; | |
1da177e4 LT |
1035 | /* case -EINVAL: */ |
1036 | default: | |
1da177e4 LT |
1037 | goto out; |
1038 | } | |
02a913a7 | 1039 | } else if (res != NULL) |
1da177e4 | 1040 | dentry = res; |
1da177e4 LT |
1041 | out: |
1042 | return res; | |
1043 | no_open: | |
1044 | return nfs_lookup(dir, dentry, nd); | |
1045 | } | |
1046 | ||
1047 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1048 | { | |
1049 | struct dentry *parent = NULL; | |
1050 | struct inode *inode = dentry->d_inode; | |
1051 | struct inode *dir; | |
1da177e4 LT |
1052 | int openflags, ret = 0; |
1053 | ||
1054 | parent = dget_parent(dentry); | |
1055 | dir = parent->d_inode; | |
1056 | if (!is_atomic_open(dir, nd)) | |
1057 | goto no_open; | |
1058 | /* We can't create new files in nfs_open_revalidate(), so we | |
1059 | * optimize away revalidation of negative dentries. | |
1060 | */ | |
216d5d06 TM |
1061 | if (inode == NULL) { |
1062 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1063 | ret = 1; | |
1da177e4 | 1064 | goto out; |
216d5d06 TM |
1065 | } |
1066 | ||
1da177e4 LT |
1067 | /* NFS only supports OPEN on regular files */ |
1068 | if (!S_ISREG(inode->i_mode)) | |
1069 | goto no_open; | |
1070 | openflags = nd->intent.open.flags; | |
1071 | /* We cannot do exclusive creation on a positive dentry */ | |
1072 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
1073 | goto no_open; | |
1074 | /* We can't create new files, or truncate existing ones here */ | |
1075 | openflags &= ~(O_CREAT|O_TRUNC); | |
1076 | ||
1077 | /* | |
1b1dcc1b | 1078 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1079 | * operations that change the directory. We therefore save the |
1080 | * change attribute *before* we do the RPC call. | |
1081 | */ | |
02a913a7 | 1082 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
1da177e4 LT |
1083 | out: |
1084 | dput(parent); | |
1085 | if (!ret) | |
1086 | d_drop(dentry); | |
1087 | return ret; | |
1088 | no_open: | |
1089 | dput(parent); | |
1090 | if (inode != NULL && nfs_have_delegation(inode, FMODE_READ)) | |
1091 | return 1; | |
1092 | return nfs_lookup_revalidate(dentry, nd); | |
1093 | } | |
1094 | #endif /* CONFIG_NFSV4 */ | |
1095 | ||
1096 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) | |
1097 | { | |
01cce933 | 1098 | struct dentry *parent = desc->file->f_path.dentry; |
1da177e4 LT |
1099 | struct inode *dir = parent->d_inode; |
1100 | struct nfs_entry *entry = desc->entry; | |
1101 | struct dentry *dentry, *alias; | |
1102 | struct qstr name = { | |
1103 | .name = entry->name, | |
1104 | .len = entry->len, | |
1105 | }; | |
1106 | struct inode *inode; | |
57fa76f2 | 1107 | unsigned long verf = nfs_save_change_attribute(dir); |
1da177e4 LT |
1108 | |
1109 | switch (name.len) { | |
1110 | case 2: | |
1111 | if (name.name[0] == '.' && name.name[1] == '.') | |
1112 | return dget_parent(parent); | |
1113 | break; | |
1114 | case 1: | |
1115 | if (name.name[0] == '.') | |
1116 | return dget(parent); | |
1117 | } | |
57fa76f2 TM |
1118 | |
1119 | spin_lock(&dir->i_lock); | |
1120 | if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) { | |
1121 | spin_unlock(&dir->i_lock); | |
1122 | return NULL; | |
1123 | } | |
1124 | spin_unlock(&dir->i_lock); | |
1125 | ||
1da177e4 LT |
1126 | name.hash = full_name_hash(name.name, name.len); |
1127 | dentry = d_lookup(parent, &name); | |
df1d5d23 | 1128 | if (dentry != NULL) { |
ef75c797 TM |
1129 | /* Is this a positive dentry that matches the readdir info? */ |
1130 | if (dentry->d_inode != NULL && | |
1131 | (NFS_FILEID(dentry->d_inode) == entry->ino || | |
1132 | d_mountpoint(dentry))) { | |
1133 | if (!desc->plus || entry->fh->size == 0) | |
1134 | return dentry; | |
1135 | if (nfs_compare_fh(NFS_FH(dentry->d_inode), | |
1136 | entry->fh) == 0) | |
1137 | goto out_renew; | |
1138 | } | |
df1d5d23 TM |
1139 | /* No, so d_drop to allow one to be created */ |
1140 | d_drop(dentry); | |
1141 | dput(dentry); | |
1142 | } | |
1da177e4 LT |
1143 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) |
1144 | return NULL; | |
54af3bb5 TM |
1145 | if (name.len > NFS_SERVER(dir)->namelen) |
1146 | return NULL; | |
1b1dcc1b | 1147 | /* Note: caller is already holding the dir->i_mutex! */ |
1da177e4 LT |
1148 | dentry = d_alloc(parent, &name); |
1149 | if (dentry == NULL) | |
1150 | return NULL; | |
1151 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1152 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
03f28e3a | 1153 | if (IS_ERR(inode)) { |
1da177e4 LT |
1154 | dput(dentry); |
1155 | return NULL; | |
1156 | } | |
54ceac45 DH |
1157 | |
1158 | alias = d_materialise_unique(dentry, inode); | |
1da177e4 LT |
1159 | if (alias != NULL) { |
1160 | dput(dentry); | |
9eaef27b TM |
1161 | if (IS_ERR(alias)) |
1162 | return NULL; | |
1da177e4 LT |
1163 | dentry = alias; |
1164 | } | |
54ceac45 | 1165 | |
c79ba787 | 1166 | out_renew: |
57fa76f2 | 1167 | nfs_set_verifier(dentry, verf); |
c79ba787 | 1168 | return dentry; |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | /* | |
1172 | * Code common to create, mkdir, and mknod. | |
1173 | */ | |
1174 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1175 | struct nfs_fattr *fattr) | |
1176 | { | |
fab728e1 TM |
1177 | struct dentry *parent = dget_parent(dentry); |
1178 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1179 | struct inode *inode; |
1180 | int error = -EACCES; | |
1181 | ||
fab728e1 TM |
1182 | d_drop(dentry); |
1183 | ||
1da177e4 LT |
1184 | /* We may have been initialized further down */ |
1185 | if (dentry->d_inode) | |
fab728e1 | 1186 | goto out; |
1da177e4 | 1187 | if (fhandle->size == 0) { |
1da177e4 LT |
1188 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1189 | if (error) | |
fab728e1 | 1190 | goto out_error; |
1da177e4 | 1191 | } |
5724ab37 | 1192 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1193 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1194 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1195 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1196 | if (error < 0) |
fab728e1 | 1197 | goto out_error; |
1da177e4 | 1198 | } |
1da177e4 | 1199 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1200 | error = PTR_ERR(inode); |
1201 | if (IS_ERR(inode)) | |
fab728e1 TM |
1202 | goto out_error; |
1203 | d_add(dentry, inode); | |
1204 | out: | |
1205 | dput(parent); | |
1da177e4 | 1206 | return 0; |
fab728e1 TM |
1207 | out_error: |
1208 | nfs_mark_for_revalidate(dir); | |
1209 | dput(parent); | |
1210 | return error; | |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | /* | |
1214 | * Following a failed create operation, we drop the dentry rather | |
1215 | * than retain a negative dentry. This avoids a problem in the event | |
1216 | * that the operation succeeded on the server, but an error in the | |
1217 | * reply path made it appear to have failed. | |
1218 | */ | |
1219 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1220 | struct nameidata *nd) | |
1221 | { | |
1222 | struct iattr attr; | |
1223 | int error; | |
1224 | int open_flags = 0; | |
1225 | ||
1e7cb3dc CL |
1226 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1227 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1228 | |
1229 | attr.ia_mode = mode; | |
1230 | attr.ia_valid = ATTR_MODE; | |
1231 | ||
ad389da7 | 1232 | if ((nd->flags & LOOKUP_CREATE) != 0) |
1da177e4 LT |
1233 | open_flags = nd->intent.open.flags; |
1234 | ||
02a913a7 | 1235 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
1da177e4 LT |
1236 | if (error != 0) |
1237 | goto out_err; | |
1da177e4 LT |
1238 | return 0; |
1239 | out_err: | |
1da177e4 LT |
1240 | d_drop(dentry); |
1241 | return error; | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * See comments for nfs_proc_create regarding failed operations. | |
1246 | */ | |
1247 | static int | |
1248 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1249 | { | |
1250 | struct iattr attr; | |
1251 | int status; | |
1252 | ||
1e7cb3dc CL |
1253 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1254 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1255 | |
1256 | if (!new_valid_dev(rdev)) | |
1257 | return -EINVAL; | |
1258 | ||
1259 | attr.ia_mode = mode; | |
1260 | attr.ia_valid = ATTR_MODE; | |
1261 | ||
1da177e4 | 1262 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1263 | if (status != 0) |
1264 | goto out_err; | |
1da177e4 LT |
1265 | return 0; |
1266 | out_err: | |
1da177e4 LT |
1267 | d_drop(dentry); |
1268 | return status; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * See comments for nfs_proc_create regarding failed operations. | |
1273 | */ | |
1274 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1275 | { | |
1276 | struct iattr attr; | |
1277 | int error; | |
1278 | ||
1e7cb3dc CL |
1279 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1280 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1281 | |
1282 | attr.ia_valid = ATTR_MODE; | |
1283 | attr.ia_mode = mode | S_IFDIR; | |
1284 | ||
1da177e4 | 1285 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1286 | if (error != 0) |
1287 | goto out_err; | |
1da177e4 LT |
1288 | return 0; |
1289 | out_err: | |
1290 | d_drop(dentry); | |
1da177e4 LT |
1291 | return error; |
1292 | } | |
1293 | ||
d45b9d8b TM |
1294 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1295 | { | |
1296 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1297 | d_delete(dentry); | |
1298 | } | |
1299 | ||
1da177e4 LT |
1300 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1301 | { | |
1302 | int error; | |
1303 | ||
1e7cb3dc CL |
1304 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1305 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1306 | |
1307 | lock_kernel(); | |
1da177e4 LT |
1308 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1309 | /* Ensure the VFS deletes this inode */ | |
1310 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1311 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1312 | else if (error == -ENOENT) |
1313 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1314 | unlock_kernel(); |
1315 | ||
1316 | return error; | |
1317 | } | |
1318 | ||
1319 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) | |
1320 | { | |
1321 | static unsigned int sillycounter; | |
4e769b93 | 1322 | const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2; |
1da177e4 | 1323 | const int countersize = sizeof(sillycounter)*2; |
4e769b93 | 1324 | const int slen = sizeof(".nfs")+fileidsize+countersize-1; |
1da177e4 LT |
1325 | char silly[slen+1]; |
1326 | struct qstr qsilly; | |
1327 | struct dentry *sdentry; | |
1328 | int error = -EIO; | |
1329 | ||
1330 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", | |
1331 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1332 | atomic_read(&dentry->d_count)); | |
91d5b470 | 1333 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
1da177e4 | 1334 | |
1da177e4 LT |
1335 | /* |
1336 | * We don't allow a dentry to be silly-renamed twice. | |
1337 | */ | |
1338 | error = -EBUSY; | |
1339 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1340 | goto out; | |
1341 | ||
4e769b93 PS |
1342 | sprintf(silly, ".nfs%*.*Lx", |
1343 | fileidsize, fileidsize, | |
1344 | (unsigned long long)NFS_FILEID(dentry->d_inode)); | |
1da177e4 | 1345 | |
34ea8188 TM |
1346 | /* Return delegation in anticipation of the rename */ |
1347 | nfs_inode_return_delegation(dentry->d_inode); | |
1348 | ||
1da177e4 LT |
1349 | sdentry = NULL; |
1350 | do { | |
1351 | char *suffix = silly + slen - countersize; | |
1352 | ||
1353 | dput(sdentry); | |
1354 | sillycounter++; | |
1355 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); | |
1356 | ||
1e7cb3dc CL |
1357 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
1358 | dentry->d_name.name, silly); | |
1da177e4 LT |
1359 | |
1360 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); | |
1361 | /* | |
1362 | * N.B. Better to return EBUSY here ... it could be | |
1363 | * dangerous to delete the file while it's in use. | |
1364 | */ | |
1365 | if (IS_ERR(sdentry)) | |
1366 | goto out; | |
1367 | } while(sdentry->d_inode != NULL); /* need negative lookup */ | |
1368 | ||
1369 | qsilly.name = silly; | |
1370 | qsilly.len = strlen(silly); | |
1da177e4 | 1371 | if (dentry->d_inode) { |
1da177e4 LT |
1372 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
1373 | dir, &qsilly); | |
5ba7cc48 | 1374 | nfs_mark_for_revalidate(dentry->d_inode); |
1da177e4 LT |
1375 | } else |
1376 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, | |
1377 | dir, &qsilly); | |
1da177e4 | 1378 | if (!error) { |
1da177e4 LT |
1379 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1380 | d_move(dentry, sdentry); | |
e4eff1a6 | 1381 | error = nfs_async_unlink(dir, dentry); |
1da177e4 LT |
1382 | /* If we return 0 we don't unlink */ |
1383 | } | |
1384 | dput(sdentry); | |
1385 | out: | |
1386 | return error; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Remove a file after making sure there are no pending writes, | |
1391 | * and after checking that the file has only one user. | |
1392 | * | |
1393 | * We invalidate the attribute cache and free the inode prior to the operation | |
1394 | * to avoid possible races if the server reuses the inode. | |
1395 | */ | |
1396 | static int nfs_safe_remove(struct dentry *dentry) | |
1397 | { | |
1398 | struct inode *dir = dentry->d_parent->d_inode; | |
1399 | struct inode *inode = dentry->d_inode; | |
1400 | int error = -EBUSY; | |
1401 | ||
1402 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1403 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1404 | ||
1405 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1406 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1407 | error = 0; | |
1408 | goto out; | |
1409 | } | |
1410 | ||
1da177e4 | 1411 | if (inode != NULL) { |
cae7a073 | 1412 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1413 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1414 | /* The VFS may want to delete this inode */ | |
1415 | if (error == 0) | |
1b83d707 | 1416 | nfs_drop_nlink(inode); |
5ba7cc48 | 1417 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1418 | } else |
1419 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1420 | if (error == -ENOENT) |
1421 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1422 | out: |
1423 | return error; | |
1424 | } | |
1425 | ||
1426 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1427 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1428 | * | |
1429 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1430 | */ | |
1431 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1432 | { | |
1433 | int error; | |
1434 | int need_rehash = 0; | |
1435 | ||
1436 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1437 | dir->i_ino, dentry->d_name.name); | |
1438 | ||
1439 | lock_kernel(); | |
1440 | spin_lock(&dcache_lock); | |
1441 | spin_lock(&dentry->d_lock); | |
1442 | if (atomic_read(&dentry->d_count) > 1) { | |
1443 | spin_unlock(&dentry->d_lock); | |
1444 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1445 | /* Start asynchronous writeout of the inode */ |
1446 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 LT |
1447 | error = nfs_sillyrename(dir, dentry); |
1448 | unlock_kernel(); | |
1449 | return error; | |
1450 | } | |
1451 | if (!d_unhashed(dentry)) { | |
1452 | __d_drop(dentry); | |
1453 | need_rehash = 1; | |
1454 | } | |
1455 | spin_unlock(&dentry->d_lock); | |
1456 | spin_unlock(&dcache_lock); | |
1457 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1458 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1459 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1460 | } else if (need_rehash) | |
1461 | d_rehash(dentry); | |
1462 | unlock_kernel(); | |
1463 | return error; | |
1464 | } | |
1465 | ||
873101b3 CL |
1466 | /* |
1467 | * To create a symbolic link, most file systems instantiate a new inode, | |
1468 | * add a page to it containing the path, then write it out to the disk | |
1469 | * using prepare_write/commit_write. | |
1470 | * | |
1471 | * Unfortunately the NFS client can't create the in-core inode first | |
1472 | * because it needs a file handle to create an in-core inode (see | |
1473 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1474 | * symlink request has completed on the server. | |
1475 | * | |
1476 | * So instead we allocate a raw page, copy the symname into it, then do | |
1477 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1478 | * now have a new file handle and can instantiate an in-core NFS inode | |
1479 | * and move the raw page into its mapping. | |
1480 | */ | |
1481 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1482 | { |
873101b3 CL |
1483 | struct pagevec lru_pvec; |
1484 | struct page *page; | |
1485 | char *kaddr; | |
1da177e4 | 1486 | struct iattr attr; |
873101b3 | 1487 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1488 | int error; |
1489 | ||
1490 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1491 | dir->i_ino, dentry->d_name.name, symname); | |
1492 | ||
873101b3 CL |
1493 | if (pathlen > PAGE_SIZE) |
1494 | return -ENAMETOOLONG; | |
1da177e4 | 1495 | |
873101b3 CL |
1496 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1497 | attr.ia_valid = ATTR_MODE; | |
1da177e4 LT |
1498 | |
1499 | lock_kernel(); | |
873101b3 | 1500 | |
83d93f22 | 1501 | page = alloc_page(GFP_HIGHUSER); |
873101b3 CL |
1502 | if (!page) { |
1503 | unlock_kernel(); | |
1504 | return -ENOMEM; | |
1505 | } | |
1506 | ||
1507 | kaddr = kmap_atomic(page, KM_USER0); | |
1508 | memcpy(kaddr, symname, pathlen); | |
1509 | if (pathlen < PAGE_SIZE) | |
1510 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1511 | kunmap_atomic(kaddr, KM_USER0); | |
1512 | ||
94a6d753 | 1513 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1514 | if (error != 0) { |
1515 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1516 | dir->i_sb->s_id, dir->i_ino, | |
1517 | dentry->d_name.name, symname, error); | |
1da177e4 | 1518 | d_drop(dentry); |
873101b3 CL |
1519 | __free_page(page); |
1520 | unlock_kernel(); | |
1521 | return error; | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * No big deal if we can't add this page to the page cache here. | |
1526 | * READLINK will get the missing page from the server if needed. | |
1527 | */ | |
1528 | pagevec_init(&lru_pvec, 0); | |
1529 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1530 | GFP_KERNEL)) { | |
39cf8a13 CL |
1531 | pagevec_add(&lru_pvec, page); |
1532 | pagevec_lru_add(&lru_pvec); | |
873101b3 CL |
1533 | SetPageUptodate(page); |
1534 | unlock_page(page); | |
1535 | } else | |
1536 | __free_page(page); | |
1537 | ||
1da177e4 | 1538 | unlock_kernel(); |
873101b3 | 1539 | return 0; |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | static int | |
1543 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1544 | { | |
1545 | struct inode *inode = old_dentry->d_inode; | |
1546 | int error; | |
1547 | ||
1548 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1549 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1550 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1551 | ||
9697d234 | 1552 | d_drop(dentry); |
1da177e4 | 1553 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 TM |
1554 | if (error == 0) { |
1555 | atomic_inc(&inode->i_count); | |
9697d234 | 1556 | d_add(dentry, inode); |
cf809556 | 1557 | } |
1da177e4 LT |
1558 | return error; |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * RENAME | |
1563 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1564 | * different file handle for the same inode after a rename (e.g. when | |
1565 | * moving to a different directory). A fail-safe method to do so would | |
1566 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1567 | * rename the old file using the sillyrename stuff. This way, the original | |
1568 | * file in old_dir will go away when the last process iput()s the inode. | |
1569 | * | |
1570 | * FIXED. | |
1571 | * | |
1572 | * It actually works quite well. One needs to have the possibility for | |
1573 | * at least one ".nfs..." file in each directory the file ever gets | |
1574 | * moved or linked to which happens automagically with the new | |
1575 | * implementation that only depends on the dcache stuff instead of | |
1576 | * using the inode layer | |
1577 | * | |
1578 | * Unfortunately, things are a little more complicated than indicated | |
1579 | * above. For a cross-directory move, we want to make sure we can get | |
1580 | * rid of the old inode after the operation. This means there must be | |
1581 | * no pending writes (if it's a file), and the use count must be 1. | |
1582 | * If these conditions are met, we can drop the dentries before doing | |
1583 | * the rename. | |
1584 | */ | |
1585 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1586 | struct inode *new_dir, struct dentry *new_dentry) | |
1587 | { | |
1588 | struct inode *old_inode = old_dentry->d_inode; | |
1589 | struct inode *new_inode = new_dentry->d_inode; | |
1590 | struct dentry *dentry = NULL, *rehash = NULL; | |
1591 | int error = -EBUSY; | |
1592 | ||
1593 | /* | |
1594 | * To prevent any new references to the target during the rename, | |
1595 | * we unhash the dentry and free the inode in advance. | |
1596 | */ | |
1597 | lock_kernel(); | |
1598 | if (!d_unhashed(new_dentry)) { | |
1599 | d_drop(new_dentry); | |
1600 | rehash = new_dentry; | |
1601 | } | |
1602 | ||
1603 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", | |
1604 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1605 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1606 | atomic_read(&new_dentry->d_count)); | |
1607 | ||
1608 | /* | |
1609 | * First check whether the target is busy ... we can't | |
1610 | * safely do _any_ rename if the target is in use. | |
1611 | * | |
1612 | * For files, make a copy of the dentry and then do a | |
1613 | * silly-rename. If the silly-rename succeeds, the | |
1614 | * copied dentry is hashed and becomes the new target. | |
1615 | */ | |
1616 | if (!new_inode) | |
1617 | goto go_ahead; | |
6fe43f9e TM |
1618 | if (S_ISDIR(new_inode->i_mode)) { |
1619 | error = -EISDIR; | |
1620 | if (!S_ISDIR(old_inode->i_mode)) | |
1621 | goto out; | |
1622 | } else if (atomic_read(&new_dentry->d_count) > 2) { | |
1da177e4 LT |
1623 | int err; |
1624 | /* copy the target dentry's name */ | |
1625 | dentry = d_alloc(new_dentry->d_parent, | |
1626 | &new_dentry->d_name); | |
1627 | if (!dentry) | |
1628 | goto out; | |
1629 | ||
1630 | /* silly-rename the existing target ... */ | |
1631 | err = nfs_sillyrename(new_dir, new_dentry); | |
1632 | if (!err) { | |
1633 | new_dentry = rehash = dentry; | |
1634 | new_inode = NULL; | |
1635 | /* instantiate the replacement target */ | |
1636 | d_instantiate(new_dentry, NULL); | |
7a13e932 JJ |
1637 | } else if (atomic_read(&new_dentry->d_count) > 1) |
1638 | /* dentry still busy? */ | |
1da177e4 | 1639 | goto out; |
20509f1b | 1640 | } else |
1b83d707 | 1641 | nfs_drop_nlink(new_inode); |
1da177e4 LT |
1642 | |
1643 | go_ahead: | |
1644 | /* | |
1645 | * ... prune child dentries and writebacks if needed. | |
1646 | */ | |
1647 | if (atomic_read(&old_dentry->d_count) > 1) { | |
e1552e19 TM |
1648 | if (S_ISREG(old_inode->i_mode)) |
1649 | nfs_wb_all(old_inode); | |
1da177e4 LT |
1650 | shrink_dcache_parent(old_dentry); |
1651 | } | |
cae7a073 | 1652 | nfs_inode_return_delegation(old_inode); |
1da177e4 | 1653 | |
24174119 TM |
1654 | if (new_inode != NULL) { |
1655 | nfs_inode_return_delegation(new_inode); | |
1da177e4 | 1656 | d_delete(new_dentry); |
24174119 | 1657 | } |
1da177e4 | 1658 | |
1da177e4 LT |
1659 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1660 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1661 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1662 | out: |
1663 | if (rehash) | |
1664 | d_rehash(rehash); | |
1665 | if (!error) { | |
349457cc | 1666 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1667 | nfs_set_verifier(new_dentry, |
1668 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1669 | } else if (error == -ENOENT) |
1670 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1671 | |
1672 | /* new dentry created? */ | |
1673 | if (dentry) | |
1674 | dput(dentry); | |
1675 | unlock_kernel(); | |
1676 | return error; | |
1677 | } | |
1678 | ||
cfcea3e8 TM |
1679 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1680 | static LIST_HEAD(nfs_access_lru_list); | |
1681 | static atomic_long_t nfs_access_nr_entries; | |
1682 | ||
1c3c07e9 TM |
1683 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1684 | { | |
1685 | put_rpccred(entry->cred); | |
1686 | kfree(entry); | |
cfcea3e8 TM |
1687 | smp_mb__before_atomic_dec(); |
1688 | atomic_long_dec(&nfs_access_nr_entries); | |
1689 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1690 | } |
1691 | ||
979df72e TM |
1692 | int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask) |
1693 | { | |
1694 | LIST_HEAD(head); | |
1695 | struct nfs_inode *nfsi; | |
1696 | struct nfs_access_entry *cache; | |
1697 | ||
979df72e | 1698 | restart: |
a50f7951 | 1699 | spin_lock(&nfs_access_lru_lock); |
979df72e | 1700 | list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) { |
6f23e387 | 1701 | struct rw_semaphore *s_umount; |
979df72e TM |
1702 | struct inode *inode; |
1703 | ||
1704 | if (nr_to_scan-- == 0) | |
1705 | break; | |
6f23e387 TM |
1706 | s_umount = &nfsi->vfs_inode.i_sb->s_umount; |
1707 | if (!down_read_trylock(s_umount)) | |
1708 | continue; | |
979df72e | 1709 | inode = igrab(&nfsi->vfs_inode); |
6f23e387 TM |
1710 | if (inode == NULL) { |
1711 | up_read(s_umount); | |
979df72e | 1712 | continue; |
6f23e387 | 1713 | } |
979df72e TM |
1714 | spin_lock(&inode->i_lock); |
1715 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1716 | goto remove_lru_entry; | |
1717 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1718 | struct nfs_access_entry, lru); | |
1719 | list_move(&cache->lru, &head); | |
1720 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1721 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1722 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1723 | &nfs_access_lru_list); | |
1724 | else { | |
1725 | remove_lru_entry: | |
1726 | list_del_init(&nfsi->access_cache_inode_lru); | |
1727 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); | |
1728 | } | |
1729 | spin_unlock(&inode->i_lock); | |
a50f7951 | 1730 | spin_unlock(&nfs_access_lru_lock); |
979df72e | 1731 | iput(inode); |
6f23e387 | 1732 | up_read(s_umount); |
979df72e TM |
1733 | goto restart; |
1734 | } | |
1735 | spin_unlock(&nfs_access_lru_lock); | |
1736 | while (!list_empty(&head)) { | |
1737 | cache = list_entry(head.next, struct nfs_access_entry, lru); | |
1738 | list_del(&cache->lru); | |
1739 | nfs_access_free_entry(cache); | |
1740 | } | |
1741 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; | |
1742 | } | |
1743 | ||
1c3c07e9 | 1744 | static void __nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1745 | { |
55296809 | 1746 | struct nfs_inode *nfsi = NFS_I(inode); |
1c3c07e9 TM |
1747 | struct rb_root *root_node = &nfsi->access_cache; |
1748 | struct rb_node *n, *dispose = NULL; | |
1749 | struct nfs_access_entry *entry; | |
1750 | ||
1751 | /* Unhook entries from the cache */ | |
1752 | while ((n = rb_first(root_node)) != NULL) { | |
1753 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1754 | rb_erase(n, root_node); | |
cfcea3e8 | 1755 | list_del(&entry->lru); |
1c3c07e9 TM |
1756 | n->rb_left = dispose; |
1757 | dispose = n; | |
1758 | } | |
1759 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1760 | spin_unlock(&inode->i_lock); | |
1da177e4 | 1761 | |
1c3c07e9 TM |
1762 | /* Now kill them all! */ |
1763 | while (dispose != NULL) { | |
1764 | n = dispose; | |
1765 | dispose = n->rb_left; | |
1766 | nfs_access_free_entry(rb_entry(n, struct nfs_access_entry, rb_node)); | |
1767 | } | |
1da177e4 LT |
1768 | } |
1769 | ||
1c3c07e9 | 1770 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1771 | { |
cfcea3e8 | 1772 | /* Remove from global LRU init */ |
3a10c30a | 1773 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 TM |
1774 | spin_lock(&nfs_access_lru_lock); |
1775 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); | |
1776 | spin_unlock(&nfs_access_lru_lock); | |
1777 | } | |
1778 | ||
1c3c07e9 TM |
1779 | spin_lock(&inode->i_lock); |
1780 | /* This will release the spinlock */ | |
1781 | __nfs_access_zap_cache(inode); | |
1782 | } | |
1da177e4 | 1783 | |
1c3c07e9 TM |
1784 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
1785 | { | |
1786 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1787 | struct nfs_access_entry *entry; | |
1788 | ||
1789 | while (n != NULL) { | |
1790 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1791 | ||
1792 | if (cred < entry->cred) | |
1793 | n = n->rb_left; | |
1794 | else if (cred > entry->cred) | |
1795 | n = n->rb_right; | |
1796 | else | |
1797 | return entry; | |
1da177e4 | 1798 | } |
1c3c07e9 TM |
1799 | return NULL; |
1800 | } | |
1801 | ||
af22f94a | 1802 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
1803 | { |
1804 | struct nfs_inode *nfsi = NFS_I(inode); | |
1805 | struct nfs_access_entry *cache; | |
1806 | int err = -ENOENT; | |
1807 | ||
dc59250c | 1808 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
1809 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
1810 | goto out_zap; | |
1811 | cache = nfs_access_search_rbtree(inode, cred); | |
1812 | if (cache == NULL) | |
1813 | goto out; | |
c7c20973 | 1814 | if (!time_in_range(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
1815 | goto out_stale; |
1816 | res->jiffies = cache->jiffies; | |
1817 | res->cred = cache->cred; | |
1818 | res->mask = cache->mask; | |
cfcea3e8 | 1819 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
1820 | err = 0; |
1821 | out: | |
1822 | spin_unlock(&inode->i_lock); | |
1823 | return err; | |
1824 | out_stale: | |
1825 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 1826 | list_del(&cache->lru); |
1c3c07e9 TM |
1827 | spin_unlock(&inode->i_lock); |
1828 | nfs_access_free_entry(cache); | |
1829 | return -ENOENT; | |
1830 | out_zap: | |
1831 | /* This will release the spinlock */ | |
1832 | __nfs_access_zap_cache(inode); | |
1833 | return -ENOENT; | |
1834 | } | |
1835 | ||
1836 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
1837 | { | |
cfcea3e8 TM |
1838 | struct nfs_inode *nfsi = NFS_I(inode); |
1839 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
1840 | struct rb_node **p = &root_node->rb_node; |
1841 | struct rb_node *parent = NULL; | |
1842 | struct nfs_access_entry *entry; | |
1843 | ||
1844 | spin_lock(&inode->i_lock); | |
1845 | while (*p != NULL) { | |
1846 | parent = *p; | |
1847 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
1848 | ||
1849 | if (set->cred < entry->cred) | |
1850 | p = &parent->rb_left; | |
1851 | else if (set->cred > entry->cred) | |
1852 | p = &parent->rb_right; | |
1853 | else | |
1854 | goto found; | |
1855 | } | |
1856 | rb_link_node(&set->rb_node, parent, p); | |
1857 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 1858 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 1859 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
1860 | return; |
1861 | found: | |
1862 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
1863 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
1864 | list_del(&entry->lru); | |
1c3c07e9 TM |
1865 | spin_unlock(&inode->i_lock); |
1866 | nfs_access_free_entry(entry); | |
1867 | } | |
1868 | ||
af22f94a | 1869 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
1870 | { |
1871 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
1872 | if (cache == NULL) | |
1873 | return; | |
1874 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 1875 | cache->jiffies = set->jiffies; |
1c3c07e9 | 1876 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 1877 | cache->mask = set->mask; |
1c3c07e9 TM |
1878 | |
1879 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
1880 | |
1881 | /* Update accounting */ | |
1882 | smp_mb__before_atomic_inc(); | |
1883 | atomic_long_inc(&nfs_access_nr_entries); | |
1884 | smp_mb__after_atomic_inc(); | |
1885 | ||
1886 | /* Add inode to global LRU list */ | |
3a10c30a | 1887 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 TM |
1888 | spin_lock(&nfs_access_lru_lock); |
1889 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, &nfs_access_lru_list); | |
1890 | spin_unlock(&nfs_access_lru_lock); | |
1891 | } | |
1da177e4 LT |
1892 | } |
1893 | ||
1894 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
1895 | { | |
1896 | struct nfs_access_entry cache; | |
1897 | int status; | |
1898 | ||
1899 | status = nfs_access_get_cached(inode, cred, &cache); | |
1900 | if (status == 0) | |
1901 | goto out; | |
1902 | ||
1903 | /* Be clever: ask server to check for all possible rights */ | |
1904 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
1905 | cache.cred = cred; | |
1906 | cache.jiffies = jiffies; | |
1907 | status = NFS_PROTO(inode)->access(inode, &cache); | |
1908 | if (status != 0) | |
1909 | return status; | |
1910 | nfs_access_add_cache(inode, &cache); | |
1911 | out: | |
1912 | if ((cache.mask & mask) == mask) | |
1913 | return 0; | |
1914 | return -EACCES; | |
1915 | } | |
1916 | ||
af22f94a TM |
1917 | static int nfs_open_permission_mask(int openflags) |
1918 | { | |
1919 | int mask = 0; | |
1920 | ||
1921 | if (openflags & FMODE_READ) | |
1922 | mask |= MAY_READ; | |
1923 | if (openflags & FMODE_WRITE) | |
1924 | mask |= MAY_WRITE; | |
1925 | if (openflags & FMODE_EXEC) | |
1926 | mask |= MAY_EXEC; | |
1927 | return mask; | |
1928 | } | |
1929 | ||
1930 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
1931 | { | |
1932 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
1933 | } | |
1934 | ||
1da177e4 LT |
1935 | int nfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
1936 | { | |
1937 | struct rpc_cred *cred; | |
1938 | int res = 0; | |
1939 | ||
91d5b470 CL |
1940 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
1941 | ||
1da177e4 LT |
1942 | if (mask == 0) |
1943 | goto out; | |
1944 | /* Is this sys_access() ? */ | |
1945 | if (nd != NULL && (nd->flags & LOOKUP_ACCESS)) | |
1946 | goto force_lookup; | |
1947 | ||
1948 | switch (inode->i_mode & S_IFMT) { | |
1949 | case S_IFLNK: | |
1950 | goto out; | |
1951 | case S_IFREG: | |
1952 | /* NFSv4 has atomic_open... */ | |
1953 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
1954 | && nd != NULL | |
1955 | && (nd->flags & LOOKUP_OPEN)) | |
1956 | goto out; | |
1957 | break; | |
1958 | case S_IFDIR: | |
1959 | /* | |
1960 | * Optimize away all write operations, since the server | |
1961 | * will check permissions when we perform the op. | |
1962 | */ | |
1963 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
1964 | goto out; | |
1965 | } | |
1966 | ||
1967 | force_lookup: | |
1da177e4 LT |
1968 | if (!NFS_PROTO(inode)->access) |
1969 | goto out_notsup; | |
1970 | ||
98a8e323 | 1971 | cred = rpc_lookup_cred(); |
1da177e4 LT |
1972 | if (!IS_ERR(cred)) { |
1973 | res = nfs_do_access(inode, cred, mask); | |
1974 | put_rpccred(cred); | |
1975 | } else | |
1976 | res = PTR_ERR(cred); | |
1da177e4 | 1977 | out: |
1e7cb3dc CL |
1978 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
1979 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
1980 | return res; |
1981 | out_notsup: | |
1982 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1983 | if (res == 0) | |
1984 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 1985 | goto out; |
1da177e4 LT |
1986 | } |
1987 | ||
1988 | /* | |
1989 | * Local variables: | |
1990 | * version-control: t | |
1991 | * kept-new-versions: 5 | |
1992 | * End: | |
1993 | */ |