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 | 36 | |
4ce79717 | 37 | #include "nfs4_fs.h" |
1da177e4 | 38 | #include "delegation.h" |
91d5b470 | 39 | #include "iostat.h" |
4c30d56e | 40 | #include "internal.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); |
1da177e4 | 58 | |
4b6f5d20 | 59 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 60 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
61 | .read = generic_read_dir, |
62 | .readdir = nfs_readdir, | |
63 | .open = nfs_opendir, | |
64 | .release = nfs_release, | |
65 | .fsync = nfs_fsync_dir, | |
66 | }; | |
67 | ||
92e1d5be | 68 | const struct inode_operations nfs_dir_inode_operations = { |
1da177e4 LT |
69 | .create = nfs_create, |
70 | .lookup = nfs_lookup, | |
71 | .link = nfs_link, | |
72 | .unlink = nfs_unlink, | |
73 | .symlink = nfs_symlink, | |
74 | .mkdir = nfs_mkdir, | |
75 | .rmdir = nfs_rmdir, | |
76 | .mknod = nfs_mknod, | |
77 | .rename = nfs_rename, | |
78 | .permission = nfs_permission, | |
79 | .getattr = nfs_getattr, | |
80 | .setattr = nfs_setattr, | |
81 | }; | |
82 | ||
b7fa0554 | 83 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 84 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
85 | .create = nfs_create, |
86 | .lookup = nfs_lookup, | |
87 | .link = nfs_link, | |
88 | .unlink = nfs_unlink, | |
89 | .symlink = nfs_symlink, | |
90 | .mkdir = nfs_mkdir, | |
91 | .rmdir = nfs_rmdir, | |
92 | .mknod = nfs_mknod, | |
93 | .rename = nfs_rename, | |
94 | .permission = nfs_permission, | |
95 | .getattr = nfs_getattr, | |
96 | .setattr = nfs_setattr, | |
97 | .listxattr = nfs3_listxattr, | |
98 | .getxattr = nfs3_getxattr, | |
99 | .setxattr = nfs3_setxattr, | |
100 | .removexattr = nfs3_removexattr, | |
101 | }; | |
102 | #endif /* CONFIG_NFS_V3 */ | |
103 | ||
1da177e4 LT |
104 | #ifdef CONFIG_NFS_V4 |
105 | ||
106 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
92e1d5be | 107 | const struct inode_operations nfs4_dir_inode_operations = { |
1da177e4 LT |
108 | .create = nfs_create, |
109 | .lookup = nfs_atomic_lookup, | |
110 | .link = nfs_link, | |
111 | .unlink = nfs_unlink, | |
112 | .symlink = nfs_symlink, | |
113 | .mkdir = nfs_mkdir, | |
114 | .rmdir = nfs_rmdir, | |
115 | .mknod = nfs_mknod, | |
116 | .rename = nfs_rename, | |
117 | .permission = nfs_permission, | |
118 | .getattr = nfs_getattr, | |
119 | .setattr = nfs_setattr, | |
6b3b5496 BF |
120 | .getxattr = nfs4_getxattr, |
121 | .setxattr = nfs4_setxattr, | |
122 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
123 | }; |
124 | ||
125 | #endif /* CONFIG_NFS_V4 */ | |
126 | ||
127 | /* | |
128 | * Open file | |
129 | */ | |
130 | static int | |
131 | nfs_opendir(struct inode *inode, struct file *filp) | |
132 | { | |
7451c4f0 | 133 | int res; |
1da177e4 | 134 | |
6da24bc9 | 135 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
136 | filp->f_path.dentry->d_parent->d_name.name, |
137 | filp->f_path.dentry->d_name.name); | |
138 | ||
139 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 140 | |
1da177e4 | 141 | /* Call generic open code in order to cache credentials */ |
7451c4f0 | 142 | res = nfs_open(inode, filp); |
f5a73672 NB |
143 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
144 | /* This is a mountpoint, so d_revalidate will never | |
145 | * have been called, so we need to refresh the | |
146 | * inode (for close-open consistency) ourselves. | |
147 | */ | |
148 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
149 | } | |
1da177e4 LT |
150 | return res; |
151 | } | |
152 | ||
0dbb4c67 | 153 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
1da177e4 LT |
154 | typedef struct { |
155 | struct file *file; | |
156 | struct page *page; | |
157 | unsigned long page_index; | |
0dbb4c67 | 158 | __be32 *ptr; |
f0dd2136 TM |
159 | u64 *dir_cookie; |
160 | loff_t current_index; | |
1da177e4 LT |
161 | struct nfs_entry *entry; |
162 | decode_dirent_t decode; | |
163 | int plus; | |
1f4eab7e | 164 | unsigned long timestamp; |
4704f0e2 | 165 | unsigned long gencount; |
1f4eab7e | 166 | int timestamp_valid; |
1da177e4 LT |
167 | } nfs_readdir_descriptor_t; |
168 | ||
169 | /* Now we cache directories properly, by stuffing the dirent | |
170 | * data directly in the page cache. | |
171 | * | |
172 | * Inode invalidation due to refresh etc. takes care of | |
173 | * _everything_, no sloppy entry flushing logic, no extraneous | |
174 | * copying, network direct to page cache, the way it was meant | |
175 | * to be. | |
176 | * | |
177 | * NOTE: Dirent information verification is done always by the | |
178 | * page-in of the RPC reply, nowhere else, this simplies | |
179 | * things substantially. | |
180 | */ | |
181 | static | |
182 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) | |
183 | { | |
184 | struct file *file = desc->file; | |
01cce933 | 185 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 | 186 | struct rpc_cred *cred = nfs_file_cred(file); |
4704f0e2 | 187 | unsigned long timestamp, gencount; |
1da177e4 LT |
188 | int error; |
189 | ||
1e7cb3dc | 190 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
3110ff80 | 191 | __func__, (long long)desc->entry->cookie, |
1e7cb3dc | 192 | page->index); |
1da177e4 LT |
193 | |
194 | again: | |
195 | timestamp = jiffies; | |
4704f0e2 | 196 | gencount = nfs_inc_attr_generation_counter(); |
01cce933 | 197 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, desc->entry->cookie, page, |
1da177e4 LT |
198 | NFS_SERVER(inode)->dtsize, desc->plus); |
199 | if (error < 0) { | |
200 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
201 | if (error == -ENOTSUPP && desc->plus) { | |
202 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 203 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
204 | desc->plus = 0; |
205 | goto again; | |
206 | } | |
207 | goto error; | |
208 | } | |
1f4eab7e | 209 | desc->timestamp = timestamp; |
4704f0e2 | 210 | desc->gencount = gencount; |
1f4eab7e | 211 | desc->timestamp_valid = 1; |
1da177e4 | 212 | SetPageUptodate(page); |
1da177e4 LT |
213 | /* Ensure consistent page alignment of the data. |
214 | * Note: assumes we have exclusive access to this mapping either | |
1b1dcc1b | 215 | * through inode->i_mutex or some other mechanism. |
1da177e4 | 216 | */ |
2aac05a9 | 217 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
cd9ae2b6 TM |
218 | /* Should never happen */ |
219 | nfs_zap_mapping(inode, inode->i_mapping); | |
220 | } | |
1da177e4 LT |
221 | unlock_page(page); |
222 | return 0; | |
223 | error: | |
1da177e4 | 224 | unlock_page(page); |
1da177e4 LT |
225 | return -EIO; |
226 | } | |
227 | ||
228 | static inline | |
229 | int dir_decode(nfs_readdir_descriptor_t *desc) | |
230 | { | |
0dbb4c67 | 231 | __be32 *p = desc->ptr; |
1da177e4 LT |
232 | p = desc->decode(p, desc->entry, desc->plus); |
233 | if (IS_ERR(p)) | |
234 | return PTR_ERR(p); | |
235 | desc->ptr = p; | |
4704f0e2 | 236 | if (desc->timestamp_valid) { |
1f4eab7e | 237 | desc->entry->fattr->time_start = desc->timestamp; |
4704f0e2 TM |
238 | desc->entry->fattr->gencount = desc->gencount; |
239 | } else | |
1f4eab7e | 240 | desc->entry->fattr->valid &= ~NFS_ATTR_FATTR; |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | ||
244 | static inline | |
245 | void dir_page_release(nfs_readdir_descriptor_t *desc) | |
246 | { | |
247 | kunmap(desc->page); | |
248 | page_cache_release(desc->page); | |
249 | desc->page = NULL; | |
250 | desc->ptr = NULL; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Given a pointer to a buffer that has already been filled by a call | |
f0dd2136 | 255 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
1da177e4 LT |
256 | * |
257 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
258 | * return the offset within the buffer of the next entry to be | |
259 | * read. | |
260 | */ | |
261 | static inline | |
00a92642 | 262 | int find_dirent(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
263 | { |
264 | struct nfs_entry *entry = desc->entry; | |
265 | int loop_count = 0, | |
266 | status; | |
267 | ||
268 | while((status = dir_decode(desc)) == 0) { | |
1e7cb3dc | 269 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
3110ff80 | 270 | __func__, (unsigned long long)entry->cookie); |
f0dd2136 | 271 | if (entry->prev_cookie == *desc->dir_cookie) |
1da177e4 LT |
272 | break; |
273 | if (loop_count++ > 200) { | |
274 | loop_count = 0; | |
275 | schedule(); | |
276 | } | |
277 | } | |
1da177e4 LT |
278 | return status; |
279 | } | |
280 | ||
281 | /* | |
00a92642 | 282 | * Given a pointer to a buffer that has already been filled by a call |
f0dd2136 | 283 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
00a92642 OG |
284 | * |
285 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
286 | * return the offset within the buffer of the next entry to be | |
287 | * read. | |
288 | */ | |
289 | static inline | |
290 | int find_dirent_index(nfs_readdir_descriptor_t *desc) | |
291 | { | |
292 | struct nfs_entry *entry = desc->entry; | |
293 | int loop_count = 0, | |
294 | status; | |
295 | ||
296 | for(;;) { | |
297 | status = dir_decode(desc); | |
298 | if (status) | |
299 | break; | |
300 | ||
1e7cb3dc CL |
301 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
302 | (unsigned long long)entry->cookie, desc->current_index); | |
00a92642 | 303 | |
f0dd2136 TM |
304 | if (desc->file->f_pos == desc->current_index) { |
305 | *desc->dir_cookie = entry->cookie; | |
00a92642 OG |
306 | break; |
307 | } | |
308 | desc->current_index++; | |
309 | if (loop_count++ > 200) { | |
310 | loop_count = 0; | |
311 | schedule(); | |
312 | } | |
313 | } | |
00a92642 OG |
314 | return status; |
315 | } | |
316 | ||
317 | /* | |
318 | * Find the given page, and call find_dirent() or find_dirent_index in | |
319 | * order to try to return the next entry. | |
1da177e4 LT |
320 | */ |
321 | static inline | |
322 | int find_dirent_page(nfs_readdir_descriptor_t *desc) | |
323 | { | |
01cce933 | 324 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 LT |
325 | struct page *page; |
326 | int status; | |
327 | ||
1e7cb3dc | 328 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
3110ff80 | 329 | __func__, desc->page_index, |
1e7cb3dc | 330 | (long long) *desc->dir_cookie); |
1da177e4 | 331 | |
1f4eab7e NB |
332 | /* If we find the page in the page_cache, we cannot be sure |
333 | * how fresh the data is, so we will ignore readdir_plus attributes. | |
334 | */ | |
335 | desc->timestamp_valid = 0; | |
1da177e4 LT |
336 | page = read_cache_page(inode->i_mapping, desc->page_index, |
337 | (filler_t *)nfs_readdir_filler, desc); | |
338 | if (IS_ERR(page)) { | |
339 | status = PTR_ERR(page); | |
340 | goto out; | |
341 | } | |
1da177e4 LT |
342 | |
343 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ | |
344 | desc->page = page; | |
345 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
f0dd2136 | 346 | if (*desc->dir_cookie != 0) |
00a92642 OG |
347 | status = find_dirent(desc); |
348 | else | |
349 | status = find_dirent_index(desc); | |
1da177e4 LT |
350 | if (status < 0) |
351 | dir_page_release(desc); | |
352 | out: | |
3110ff80 | 353 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status); |
1da177e4 | 354 | return status; |
1da177e4 LT |
355 | } |
356 | ||
357 | /* | |
358 | * Recurse through the page cache pages, and return a | |
359 | * filled nfs_entry structure of the next directory entry if possible. | |
360 | * | |
f0dd2136 TM |
361 | * The target for the search is '*desc->dir_cookie' if non-0, |
362 | * 'desc->file->f_pos' otherwise | |
1da177e4 LT |
363 | */ |
364 | static inline | |
365 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
366 | { | |
367 | int loop_count = 0; | |
368 | int res; | |
369 | ||
00a92642 | 370 | /* Always search-by-index from the beginning of the cache */ |
f0dd2136 | 371 | if (*desc->dir_cookie == 0) { |
1e7cb3dc CL |
372 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
373 | (long long)desc->file->f_pos); | |
00a92642 OG |
374 | desc->page_index = 0; |
375 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
376 | desc->entry->eof = 0; | |
377 | desc->current_index = 0; | |
f0dd2136 | 378 | } else |
1e7cb3dc CL |
379 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
380 | (unsigned long long)*desc->dir_cookie); | |
00a92642 | 381 | |
1da177e4 LT |
382 | for (;;) { |
383 | res = find_dirent_page(desc); | |
384 | if (res != -EAGAIN) | |
385 | break; | |
386 | /* Align to beginning of next page */ | |
387 | desc->page_index ++; | |
388 | if (loop_count++ > 200) { | |
389 | loop_count = 0; | |
390 | schedule(); | |
391 | } | |
392 | } | |
1e7cb3dc | 393 | |
3110ff80 | 394 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, res); |
1da177e4 LT |
395 | return res; |
396 | } | |
397 | ||
398 | static inline unsigned int dt_type(struct inode *inode) | |
399 | { | |
400 | return (inode->i_mode >> 12) & 15; | |
401 | } | |
402 | ||
403 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); | |
404 | ||
405 | /* | |
406 | * Once we've found the start of the dirent within a page: fill 'er up... | |
407 | */ | |
408 | static | |
409 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
410 | filldir_t filldir) | |
411 | { | |
412 | struct file *file = desc->file; | |
413 | struct nfs_entry *entry = desc->entry; | |
414 | struct dentry *dentry = NULL; | |
4e769b93 | 415 | u64 fileid; |
1da177e4 LT |
416 | int loop_count = 0, |
417 | res; | |
418 | ||
1e7cb3dc CL |
419 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
420 | (unsigned long long)entry->cookie); | |
1da177e4 LT |
421 | |
422 | for(;;) { | |
423 | unsigned d_type = DT_UNKNOWN; | |
424 | /* Note: entry->prev_cookie contains the cookie for | |
425 | * retrieving the current dirent on the server */ | |
4e769b93 | 426 | fileid = entry->ino; |
1da177e4 LT |
427 | |
428 | /* Get a dentry if we have one */ | |
429 | if (dentry != NULL) | |
430 | dput(dentry); | |
431 | dentry = nfs_readdir_lookup(desc); | |
432 | ||
433 | /* Use readdirplus info */ | |
434 | if (dentry != NULL && dentry->d_inode != NULL) { | |
435 | d_type = dt_type(dentry->d_inode); | |
4e769b93 | 436 | fileid = NFS_FILEID(dentry->d_inode); |
1da177e4 LT |
437 | } |
438 | ||
439 | res = filldir(dirent, entry->name, entry->len, | |
f43bf0be TM |
440 | file->f_pos, nfs_compat_user_ino64(fileid), |
441 | d_type); | |
1da177e4 LT |
442 | if (res < 0) |
443 | break; | |
00a92642 | 444 | file->f_pos++; |
f0dd2136 | 445 | *desc->dir_cookie = entry->cookie; |
1da177e4 LT |
446 | if (dir_decode(desc) != 0) { |
447 | desc->page_index ++; | |
448 | break; | |
449 | } | |
450 | if (loop_count++ > 200) { | |
451 | loop_count = 0; | |
452 | schedule(); | |
453 | } | |
454 | } | |
455 | dir_page_release(desc); | |
456 | if (dentry != NULL) | |
457 | dput(dentry); | |
1e7cb3dc CL |
458 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
459 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
460 | return res; |
461 | } | |
462 | ||
463 | /* | |
464 | * If we cannot find a cookie in our cache, we suspect that this is | |
465 | * because it points to a deleted file, so we ask the server to return | |
466 | * whatever it thinks is the next entry. We then feed this to filldir. | |
467 | * If all goes well, we should then be able to find our way round the | |
468 | * cache on the next call to readdir_search_pagecache(); | |
469 | * | |
470 | * NOTE: we cannot add the anonymous page to the pagecache because | |
471 | * the data it contains might not be page aligned. Besides, | |
472 | * we should already have a complete representation of the | |
473 | * directory in the page cache by the time we get here. | |
474 | */ | |
475 | static inline | |
476 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
477 | filldir_t filldir) | |
478 | { | |
479 | struct file *file = desc->file; | |
01cce933 | 480 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
481 | struct rpc_cred *cred = nfs_file_cred(file); |
482 | struct page *page = NULL; | |
483 | int status; | |
4704f0e2 | 484 | unsigned long timestamp, gencount; |
1da177e4 | 485 | |
1e7cb3dc CL |
486 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
487 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
488 | |
489 | page = alloc_page(GFP_HIGHUSER); | |
490 | if (!page) { | |
491 | status = -ENOMEM; | |
492 | goto out; | |
493 | } | |
1f4eab7e | 494 | timestamp = jiffies; |
4704f0e2 | 495 | gencount = nfs_inc_attr_generation_counter(); |
25606656 JL |
496 | status = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, |
497 | *desc->dir_cookie, page, | |
1da177e4 LT |
498 | NFS_SERVER(inode)->dtsize, |
499 | desc->plus); | |
1da177e4 LT |
500 | desc->page = page; |
501 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
25606656 | 502 | if (status >= 0) { |
1f4eab7e | 503 | desc->timestamp = timestamp; |
4704f0e2 | 504 | desc->gencount = gencount; |
1f4eab7e | 505 | desc->timestamp_valid = 1; |
1da177e4 | 506 | if ((status = dir_decode(desc)) == 0) |
f0dd2136 | 507 | desc->entry->prev_cookie = *desc->dir_cookie; |
1da177e4 LT |
508 | } else |
509 | status = -EIO; | |
510 | if (status < 0) | |
511 | goto out_release; | |
512 | ||
513 | status = nfs_do_filldir(desc, dirent, filldir); | |
514 | ||
515 | /* Reset read descriptor so it searches the page cache from | |
516 | * the start upon the next call to readdir_search_pagecache() */ | |
517 | desc->page_index = 0; | |
518 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
519 | desc->entry->eof = 0; | |
520 | out: | |
1e7cb3dc | 521 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 522 | __func__, status); |
1da177e4 LT |
523 | return status; |
524 | out_release: | |
525 | dir_page_release(desc); | |
526 | goto out; | |
527 | } | |
528 | ||
00a92642 OG |
529 | /* The file offset position represents the dirent entry number. A |
530 | last cookie cache takes care of the common case of reading the | |
531 | whole directory. | |
1da177e4 LT |
532 | */ |
533 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
534 | { | |
01cce933 | 535 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
536 | struct inode *inode = dentry->d_inode; |
537 | nfs_readdir_descriptor_t my_desc, | |
538 | *desc = &my_desc; | |
539 | struct nfs_entry my_entry; | |
aa49b4cf | 540 | int res = -ENOMEM; |
1da177e4 | 541 | |
6da24bc9 | 542 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
543 | dentry->d_parent->d_name.name, dentry->d_name.name, |
544 | (long long)filp->f_pos); | |
91d5b470 CL |
545 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
546 | ||
1da177e4 | 547 | /* |
00a92642 | 548 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 549 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
550 | * to either find the entry with the appropriate number or |
551 | * revalidate the cookie. | |
1da177e4 LT |
552 | */ |
553 | memset(desc, 0, sizeof(*desc)); | |
554 | ||
555 | desc->file = filp; | |
cd3758e3 | 556 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
557 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
558 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
559 | ||
560 | my_entry.cookie = my_entry.prev_cookie = 0; | |
561 | my_entry.eof = 0; | |
aa49b4cf TM |
562 | my_entry.fh = nfs_alloc_fhandle(); |
563 | my_entry.fattr = nfs_alloc_fattr(); | |
564 | if (my_entry.fh == NULL || my_entry.fattr == NULL) | |
565 | goto out_alloc_failed; | |
566 | ||
1da177e4 LT |
567 | desc->entry = &my_entry; |
568 | ||
565277f6 | 569 | nfs_block_sillyrename(dentry); |
1cda707d | 570 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
571 | if (res < 0) |
572 | goto out; | |
573 | ||
1da177e4 LT |
574 | while(!desc->entry->eof) { |
575 | res = readdir_search_pagecache(desc); | |
00a92642 | 576 | |
1da177e4 LT |
577 | if (res == -EBADCOOKIE) { |
578 | /* This means either end of directory */ | |
f0dd2136 | 579 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
1da177e4 LT |
580 | /* Or that the server has 'lost' a cookie */ |
581 | res = uncached_readdir(desc, dirent, filldir); | |
582 | if (res >= 0) | |
583 | continue; | |
584 | } | |
585 | res = 0; | |
586 | break; | |
587 | } | |
588 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 589 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
590 | nfs_zap_caches(inode); |
591 | desc->plus = 0; | |
592 | desc->entry->eof = 0; | |
593 | continue; | |
594 | } | |
595 | if (res < 0) | |
596 | break; | |
597 | ||
598 | res = nfs_do_filldir(desc, dirent, filldir); | |
599 | if (res < 0) { | |
600 | res = 0; | |
601 | break; | |
602 | } | |
603 | } | |
fccca7fc | 604 | out: |
565277f6 | 605 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
606 | if (res > 0) |
607 | res = 0; | |
aa49b4cf TM |
608 | out_alloc_failed: |
609 | nfs_free_fattr(my_entry.fattr); | |
610 | nfs_free_fhandle(my_entry.fh); | |
611 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", | |
1e7cb3dc CL |
612 | dentry->d_parent->d_name.name, dentry->d_name.name, |
613 | res); | |
614 | return res; | |
1da177e4 LT |
615 | } |
616 | ||
10afec90 | 617 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 618 | { |
b84e06c5 CL |
619 | struct dentry *dentry = filp->f_path.dentry; |
620 | struct inode *inode = dentry->d_inode; | |
621 | ||
6da24bc9 | 622 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
623 | dentry->d_parent->d_name.name, |
624 | dentry->d_name.name, | |
625 | offset, origin); | |
626 | ||
627 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
628 | switch (origin) { |
629 | case 1: | |
630 | offset += filp->f_pos; | |
631 | case 0: | |
632 | if (offset >= 0) | |
633 | break; | |
634 | default: | |
635 | offset = -EINVAL; | |
636 | goto out; | |
637 | } | |
638 | if (offset != filp->f_pos) { | |
639 | filp->f_pos = offset; | |
cd3758e3 | 640 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
641 | } |
642 | out: | |
b84e06c5 | 643 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
644 | return offset; |
645 | } | |
646 | ||
1da177e4 LT |
647 | /* |
648 | * All directory operations under NFS are synchronous, so fsync() | |
649 | * is a dummy operation. | |
650 | */ | |
7ea80859 | 651 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 652 | { |
7ea80859 CH |
653 | struct dentry *dentry = filp->f_path.dentry; |
654 | ||
6da24bc9 | 655 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
656 | dentry->d_parent->d_name.name, dentry->d_name.name, |
657 | datasync); | |
658 | ||
54917786 | 659 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
660 | return 0; |
661 | } | |
662 | ||
bfc69a45 TM |
663 | /** |
664 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
665 | * @dir - pointer to directory inode | |
666 | * | |
667 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
668 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
669 | * on the server that might have invalidated our dcache. | |
670 | * | |
671 | * The caller should be holding dir->i_lock | |
672 | */ | |
673 | void nfs_force_lookup_revalidate(struct inode *dir) | |
674 | { | |
011935a0 | 675 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
676 | } |
677 | ||
1da177e4 LT |
678 | /* |
679 | * A check for whether or not the parent directory has changed. | |
680 | * In the case it has, we assume that the dentries are untrustworthy | |
681 | * and may need to be looked up again. | |
682 | */ | |
c79ba787 | 683 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
684 | { |
685 | if (IS_ROOT(dentry)) | |
686 | return 1; | |
4eec952e TM |
687 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
688 | return 0; | |
f2c77f4e TM |
689 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
690 | return 0; | |
691 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
692 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
693 | return 0; | |
694 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
695 | return 0; | |
696 | return 1; | |
1da177e4 LT |
697 | } |
698 | ||
1d6757fb TM |
699 | /* |
700 | * Return the intent data that applies to this particular path component | |
701 | * | |
702 | * Note that the current set of intents only apply to the very last | |
703 | * component of the path. | |
704 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
705 | */ | |
706 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
707 | { | |
708 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
709 | return 0; | |
710 | return nd->flags & mask; | |
711 | } | |
712 | ||
a12802ca TM |
713 | /* |
714 | * Use intent information to check whether or not we're going to do | |
715 | * an O_EXCL create using this path component. | |
716 | */ | |
717 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
718 | { | |
719 | if (NFS_PROTO(dir)->version == 2) | |
720 | return 0; | |
3516586a | 721 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
722 | } |
723 | ||
1d6757fb TM |
724 | /* |
725 | * Inode and filehandle revalidation for lookups. | |
726 | * | |
727 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
728 | * or if the intent information indicates that we're about to open this | |
729 | * particular file and the "nocto" mount flag is not set. | |
730 | * | |
731 | */ | |
1da177e4 LT |
732 | static inline |
733 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
734 | { | |
735 | struct nfs_server *server = NFS_SERVER(inode); | |
736 | ||
4e99a1ff TM |
737 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
738 | return 0; | |
1da177e4 | 739 | if (nd != NULL) { |
1da177e4 | 740 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 741 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
742 | goto out_force; |
743 | /* This is an open(2) */ | |
1d6757fb | 744 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
745 | !(server->flags & NFS_MOUNT_NOCTO) && |
746 | (S_ISREG(inode->i_mode) || | |
747 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 748 | goto out_force; |
4f48af45 | 749 | return 0; |
1da177e4 LT |
750 | } |
751 | return nfs_revalidate_inode(server, inode); | |
752 | out_force: | |
753 | return __nfs_revalidate_inode(server, inode); | |
754 | } | |
755 | ||
756 | /* | |
757 | * We judge how long we want to trust negative | |
758 | * dentries by looking at the parent inode mtime. | |
759 | * | |
760 | * If parent mtime has changed, we revalidate, else we wait for a | |
761 | * period corresponding to the parent's attribute cache timeout value. | |
762 | */ | |
763 | static inline | |
764 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
765 | struct nameidata *nd) | |
766 | { | |
1da177e4 | 767 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 768 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 769 | return 0; |
4eec952e TM |
770 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
771 | return 1; | |
1da177e4 LT |
772 | return !nfs_check_verifier(dir, dentry); |
773 | } | |
774 | ||
775 | /* | |
776 | * This is called every time the dcache has a lookup hit, | |
777 | * and we should check whether we can really trust that | |
778 | * lookup. | |
779 | * | |
780 | * NOTE! The hit can be a negative hit too, don't assume | |
781 | * we have an inode! | |
782 | * | |
783 | * If the parent directory is seen to have changed, we throw out the | |
784 | * cached dentry and do a new lookup. | |
785 | */ | |
786 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
787 | { | |
788 | struct inode *dir; | |
789 | struct inode *inode; | |
790 | struct dentry *parent; | |
e1fb4d05 TM |
791 | struct nfs_fh *fhandle = NULL; |
792 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 793 | int error; |
1da177e4 LT |
794 | |
795 | parent = dget_parent(dentry); | |
1da177e4 | 796 | dir = parent->d_inode; |
91d5b470 | 797 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
798 | inode = dentry->d_inode; |
799 | ||
800 | if (!inode) { | |
801 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
802 | goto out_bad; | |
803 | goto out_valid; | |
804 | } | |
805 | ||
806 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 807 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 808 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 809 | dentry->d_name.name); |
1da177e4 LT |
810 | goto out_bad; |
811 | } | |
812 | ||
15860ab1 TM |
813 | if (nfs_have_delegation(inode, FMODE_READ)) |
814 | goto out_set_verifier; | |
815 | ||
1da177e4 | 816 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 817 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
818 | if (nfs_lookup_verify_inode(inode, nd)) |
819 | goto out_zap_parent; | |
820 | goto out_valid; | |
821 | } | |
822 | ||
823 | if (NFS_STALE(inode)) | |
824 | goto out_bad; | |
825 | ||
e1fb4d05 TM |
826 | error = -ENOMEM; |
827 | fhandle = nfs_alloc_fhandle(); | |
828 | fattr = nfs_alloc_fattr(); | |
829 | if (fhandle == NULL || fattr == NULL) | |
830 | goto out_error; | |
831 | ||
832 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1da177e4 LT |
833 | if (error) |
834 | goto out_bad; | |
e1fb4d05 | 835 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 836 | goto out_bad; |
e1fb4d05 | 837 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
838 | goto out_bad; |
839 | ||
e1fb4d05 TM |
840 | nfs_free_fattr(fattr); |
841 | nfs_free_fhandle(fhandle); | |
15860ab1 | 842 | out_set_verifier: |
cf8ba45e | 843 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 844 | out_valid: |
1da177e4 | 845 | dput(parent); |
1e7cb3dc | 846 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 847 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 848 | dentry->d_name.name); |
1da177e4 LT |
849 | return 1; |
850 | out_zap_parent: | |
851 | nfs_zap_caches(dir); | |
852 | out_bad: | |
a1643a92 | 853 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
854 | if (inode && S_ISDIR(inode->i_mode)) { |
855 | /* Purge readdir caches. */ | |
856 | nfs_zap_caches(inode); | |
857 | /* If we have submounts, don't unhash ! */ | |
858 | if (have_submounts(dentry)) | |
859 | goto out_valid; | |
d9e80b7d AV |
860 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
861 | goto out_valid; | |
1da177e4 LT |
862 | shrink_dcache_parent(dentry); |
863 | } | |
864 | d_drop(dentry); | |
e1fb4d05 TM |
865 | nfs_free_fattr(fattr); |
866 | nfs_free_fhandle(fhandle); | |
1da177e4 | 867 | dput(parent); |
1e7cb3dc | 868 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 869 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 870 | dentry->d_name.name); |
1da177e4 | 871 | return 0; |
e1fb4d05 TM |
872 | out_error: |
873 | nfs_free_fattr(fattr); | |
874 | nfs_free_fhandle(fhandle); | |
875 | dput(parent); | |
876 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
877 | __func__, dentry->d_parent->d_name.name, | |
878 | dentry->d_name.name, error); | |
879 | return error; | |
1da177e4 LT |
880 | } |
881 | ||
882 | /* | |
883 | * This is called from dput() when d_count is going to 0. | |
884 | */ | |
885 | static int nfs_dentry_delete(struct dentry *dentry) | |
886 | { | |
887 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
888 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
889 | dentry->d_flags); | |
890 | ||
77f11192 TM |
891 | /* Unhash any dentry with a stale inode */ |
892 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
893 | return 1; | |
894 | ||
1da177e4 LT |
895 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
896 | /* Unhash it, so that ->d_iput() would be called */ | |
897 | return 1; | |
898 | } | |
899 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
900 | /* Unhash it, so that ancestors of killed async unlink | |
901 | * files will be cleaned up during umount */ | |
902 | return 1; | |
903 | } | |
904 | return 0; | |
905 | ||
906 | } | |
907 | ||
1b83d707 TM |
908 | static void nfs_drop_nlink(struct inode *inode) |
909 | { | |
910 | spin_lock(&inode->i_lock); | |
911 | if (inode->i_nlink > 0) | |
912 | drop_nlink(inode); | |
913 | spin_unlock(&inode->i_lock); | |
914 | } | |
915 | ||
1da177e4 LT |
916 | /* |
917 | * Called when the dentry loses inode. | |
918 | * We use it to clean up silly-renamed files. | |
919 | */ | |
920 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
921 | { | |
83672d39 NB |
922 | if (S_ISDIR(inode->i_mode)) |
923 | /* drop any readdir cache as it could easily be old */ | |
924 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
925 | ||
1da177e4 | 926 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 927 | drop_nlink(inode); |
e4eff1a6 | 928 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 929 | } |
1da177e4 LT |
930 | iput(inode); |
931 | } | |
932 | ||
f786aa90 | 933 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
934 | .d_revalidate = nfs_lookup_revalidate, |
935 | .d_delete = nfs_dentry_delete, | |
936 | .d_iput = nfs_dentry_iput, | |
937 | }; | |
938 | ||
1da177e4 LT |
939 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
940 | { | |
941 | struct dentry *res; | |
565277f6 | 942 | struct dentry *parent; |
1da177e4 | 943 | struct inode *inode = NULL; |
e1fb4d05 TM |
944 | struct nfs_fh *fhandle = NULL; |
945 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 946 | int error; |
1da177e4 LT |
947 | |
948 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
949 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 950 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
951 | |
952 | res = ERR_PTR(-ENAMETOOLONG); | |
953 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
954 | goto out; | |
955 | ||
1da177e4 LT |
956 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
957 | ||
fd684071 TM |
958 | /* |
959 | * If we're doing an exclusive create, optimize away the lookup | |
960 | * but don't hash the dentry. | |
961 | */ | |
962 | if (nfs_is_exclusive_create(dir, nd)) { | |
963 | d_instantiate(dentry, NULL); | |
964 | res = NULL; | |
fc0f684c | 965 | goto out; |
fd684071 | 966 | } |
1da177e4 | 967 | |
e1fb4d05 TM |
968 | res = ERR_PTR(-ENOMEM); |
969 | fhandle = nfs_alloc_fhandle(); | |
970 | fattr = nfs_alloc_fattr(); | |
971 | if (fhandle == NULL || fattr == NULL) | |
972 | goto out; | |
973 | ||
565277f6 TM |
974 | parent = dentry->d_parent; |
975 | /* Protect against concurrent sillydeletes */ | |
976 | nfs_block_sillyrename(parent); | |
e1fb4d05 | 977 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
978 | if (error == -ENOENT) |
979 | goto no_entry; | |
980 | if (error < 0) { | |
981 | res = ERR_PTR(error); | |
565277f6 | 982 | goto out_unblock_sillyrename; |
1da177e4 | 983 | } |
e1fb4d05 | 984 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
985 | res = (struct dentry *)inode; |
986 | if (IS_ERR(res)) | |
565277f6 | 987 | goto out_unblock_sillyrename; |
54ceac45 | 988 | |
1da177e4 | 989 | no_entry: |
54ceac45 | 990 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
991 | if (res != NULL) { |
992 | if (IS_ERR(res)) | |
565277f6 | 993 | goto out_unblock_sillyrename; |
1da177e4 | 994 | dentry = res; |
9eaef27b | 995 | } |
1da177e4 | 996 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
997 | out_unblock_sillyrename: |
998 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 999 | out: |
e1fb4d05 TM |
1000 | nfs_free_fattr(fattr); |
1001 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1002 | return res; |
1003 | } | |
1004 | ||
1005 | #ifdef CONFIG_NFS_V4 | |
1006 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1007 | ||
f786aa90 | 1008 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1009 | .d_revalidate = nfs_open_revalidate, |
1010 | .d_delete = nfs_dentry_delete, | |
1011 | .d_iput = nfs_dentry_iput, | |
1012 | }; | |
1013 | ||
1d6757fb TM |
1014 | /* |
1015 | * Use intent information to determine whether we need to substitute | |
1016 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1017 | */ | |
5584c306 | 1018 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1019 | { |
1d6757fb | 1020 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1021 | return 0; |
1022 | /* NFS does not (yet) have a stateful open for directories */ | |
1023 | if (nd->flags & LOOKUP_DIRECTORY) | |
1024 | return 0; | |
1025 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1026 | if (__mnt_is_readonly(nd->path.mnt) && |
1027 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1028 | return 0; |
1029 | return 1; | |
1030 | } | |
1031 | ||
1032 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
1033 | { | |
1034 | struct dentry *res = NULL; | |
1da177e4 LT |
1035 | int error; |
1036 | ||
1e7cb3dc CL |
1037 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1038 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1039 | ||
1da177e4 | 1040 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1041 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1042 | goto no_open; |
1043 | ||
1044 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1045 | res = ERR_PTR(-ENAMETOOLONG); | |
1046 | goto out; | |
1047 | } | |
1048 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1049 | ||
d4d9cdcb TM |
1050 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1051 | * the dentry. */ | |
3516586a | 1052 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1053 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1054 | goto out; |
1055 | } | |
1da177e4 LT |
1056 | |
1057 | /* Open the file on the server */ | |
60ccd4ec | 1058 | res = nfs4_atomic_open(dir, dentry, nd); |
02a913a7 TM |
1059 | if (IS_ERR(res)) { |
1060 | error = PTR_ERR(res); | |
1da177e4 LT |
1061 | switch (error) { |
1062 | /* Make a negative dentry */ | |
1063 | case -ENOENT: | |
02a913a7 TM |
1064 | res = NULL; |
1065 | goto out; | |
1da177e4 | 1066 | /* This turned out not to be a regular file */ |
80e60639 | 1067 | case -EISDIR: |
6f926b5b TM |
1068 | case -ENOTDIR: |
1069 | goto no_open; | |
1da177e4 LT |
1070 | case -ELOOP: |
1071 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1072 | goto no_open; | |
1da177e4 LT |
1073 | /* case -EINVAL: */ |
1074 | default: | |
1da177e4 LT |
1075 | goto out; |
1076 | } | |
02a913a7 | 1077 | } else if (res != NULL) |
1da177e4 | 1078 | dentry = res; |
1da177e4 LT |
1079 | out: |
1080 | return res; | |
1081 | no_open: | |
1082 | return nfs_lookup(dir, dentry, nd); | |
1083 | } | |
1084 | ||
1085 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1086 | { | |
1087 | struct dentry *parent = NULL; | |
1088 | struct inode *inode = dentry->d_inode; | |
1089 | struct inode *dir; | |
1da177e4 LT |
1090 | int openflags, ret = 0; |
1091 | ||
1f063d2c | 1092 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1093 | goto no_open; |
1da177e4 LT |
1094 | parent = dget_parent(dentry); |
1095 | dir = parent->d_inode; | |
1da177e4 LT |
1096 | /* We can't create new files in nfs_open_revalidate(), so we |
1097 | * optimize away revalidation of negative dentries. | |
1098 | */ | |
216d5d06 TM |
1099 | if (inode == NULL) { |
1100 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1101 | ret = 1; | |
1da177e4 | 1102 | goto out; |
216d5d06 TM |
1103 | } |
1104 | ||
1da177e4 LT |
1105 | /* NFS only supports OPEN on regular files */ |
1106 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1107 | goto no_open_dput; |
1da177e4 LT |
1108 | openflags = nd->intent.open.flags; |
1109 | /* We cannot do exclusive creation on a positive dentry */ | |
1110 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1111 | goto no_open_dput; |
1da177e4 | 1112 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1113 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 LT |
1114 | |
1115 | /* | |
1b1dcc1b | 1116 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1117 | * operations that change the directory. We therefore save the |
1118 | * change attribute *before* we do the RPC call. | |
1119 | */ | |
02a913a7 | 1120 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
1da177e4 LT |
1121 | out: |
1122 | dput(parent); | |
1123 | if (!ret) | |
1124 | d_drop(dentry); | |
1125 | return ret; | |
5584c306 | 1126 | no_open_dput: |
1da177e4 | 1127 | dput(parent); |
5584c306 | 1128 | no_open: |
1da177e4 LT |
1129 | return nfs_lookup_revalidate(dentry, nd); |
1130 | } | |
1131 | #endif /* CONFIG_NFSV4 */ | |
1132 | ||
1133 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) | |
1134 | { | |
01cce933 | 1135 | struct dentry *parent = desc->file->f_path.dentry; |
1da177e4 LT |
1136 | struct inode *dir = parent->d_inode; |
1137 | struct nfs_entry *entry = desc->entry; | |
1138 | struct dentry *dentry, *alias; | |
1139 | struct qstr name = { | |
1140 | .name = entry->name, | |
1141 | .len = entry->len, | |
1142 | }; | |
1143 | struct inode *inode; | |
57fa76f2 | 1144 | unsigned long verf = nfs_save_change_attribute(dir); |
1da177e4 LT |
1145 | |
1146 | switch (name.len) { | |
1147 | case 2: | |
1148 | if (name.name[0] == '.' && name.name[1] == '.') | |
1149 | return dget_parent(parent); | |
1150 | break; | |
1151 | case 1: | |
1152 | if (name.name[0] == '.') | |
1153 | return dget(parent); | |
1154 | } | |
57fa76f2 TM |
1155 | |
1156 | spin_lock(&dir->i_lock); | |
1157 | if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) { | |
1158 | spin_unlock(&dir->i_lock); | |
1159 | return NULL; | |
1160 | } | |
1161 | spin_unlock(&dir->i_lock); | |
1162 | ||
1da177e4 LT |
1163 | name.hash = full_name_hash(name.name, name.len); |
1164 | dentry = d_lookup(parent, &name); | |
df1d5d23 | 1165 | if (dentry != NULL) { |
ef75c797 TM |
1166 | /* Is this a positive dentry that matches the readdir info? */ |
1167 | if (dentry->d_inode != NULL && | |
1168 | (NFS_FILEID(dentry->d_inode) == entry->ino || | |
1169 | d_mountpoint(dentry))) { | |
1170 | if (!desc->plus || entry->fh->size == 0) | |
1171 | return dentry; | |
1172 | if (nfs_compare_fh(NFS_FH(dentry->d_inode), | |
1173 | entry->fh) == 0) | |
1174 | goto out_renew; | |
1175 | } | |
df1d5d23 TM |
1176 | /* No, so d_drop to allow one to be created */ |
1177 | d_drop(dentry); | |
1178 | dput(dentry); | |
1179 | } | |
1da177e4 LT |
1180 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) |
1181 | return NULL; | |
54af3bb5 TM |
1182 | if (name.len > NFS_SERVER(dir)->namelen) |
1183 | return NULL; | |
1b1dcc1b | 1184 | /* Note: caller is already holding the dir->i_mutex! */ |
1da177e4 LT |
1185 | dentry = d_alloc(parent, &name); |
1186 | if (dentry == NULL) | |
1187 | return NULL; | |
1188 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1189 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
03f28e3a | 1190 | if (IS_ERR(inode)) { |
1da177e4 LT |
1191 | dput(dentry); |
1192 | return NULL; | |
1193 | } | |
54ceac45 DH |
1194 | |
1195 | alias = d_materialise_unique(dentry, inode); | |
1da177e4 LT |
1196 | if (alias != NULL) { |
1197 | dput(dentry); | |
9eaef27b TM |
1198 | if (IS_ERR(alias)) |
1199 | return NULL; | |
1da177e4 LT |
1200 | dentry = alias; |
1201 | } | |
54ceac45 | 1202 | |
c79ba787 | 1203 | out_renew: |
57fa76f2 | 1204 | nfs_set_verifier(dentry, verf); |
c79ba787 | 1205 | return dentry; |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | /* | |
1209 | * Code common to create, mkdir, and mknod. | |
1210 | */ | |
1211 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1212 | struct nfs_fattr *fattr) | |
1213 | { | |
fab728e1 TM |
1214 | struct dentry *parent = dget_parent(dentry); |
1215 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1216 | struct inode *inode; |
1217 | int error = -EACCES; | |
1218 | ||
fab728e1 TM |
1219 | d_drop(dentry); |
1220 | ||
1da177e4 LT |
1221 | /* We may have been initialized further down */ |
1222 | if (dentry->d_inode) | |
fab728e1 | 1223 | goto out; |
1da177e4 | 1224 | if (fhandle->size == 0) { |
1da177e4 LT |
1225 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1226 | if (error) | |
fab728e1 | 1227 | goto out_error; |
1da177e4 | 1228 | } |
5724ab37 | 1229 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1230 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1231 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1232 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1233 | if (error < 0) |
fab728e1 | 1234 | goto out_error; |
1da177e4 | 1235 | } |
1da177e4 | 1236 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1237 | error = PTR_ERR(inode); |
1238 | if (IS_ERR(inode)) | |
fab728e1 TM |
1239 | goto out_error; |
1240 | d_add(dentry, inode); | |
1241 | out: | |
1242 | dput(parent); | |
1da177e4 | 1243 | return 0; |
fab728e1 TM |
1244 | out_error: |
1245 | nfs_mark_for_revalidate(dir); | |
1246 | dput(parent); | |
1247 | return error; | |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | /* | |
1251 | * Following a failed create operation, we drop the dentry rather | |
1252 | * than retain a negative dentry. This avoids a problem in the event | |
1253 | * that the operation succeeded on the server, but an error in the | |
1254 | * reply path made it appear to have failed. | |
1255 | */ | |
1256 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1257 | struct nameidata *nd) | |
1258 | { | |
1259 | struct iattr attr; | |
1260 | int error; | |
1261 | int open_flags = 0; | |
1262 | ||
1e7cb3dc CL |
1263 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1264 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1265 | |
1266 | attr.ia_mode = mode; | |
1267 | attr.ia_valid = ATTR_MODE; | |
1268 | ||
ad389da7 | 1269 | if ((nd->flags & LOOKUP_CREATE) != 0) |
1da177e4 LT |
1270 | open_flags = nd->intent.open.flags; |
1271 | ||
02a913a7 | 1272 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
1da177e4 LT |
1273 | if (error != 0) |
1274 | goto out_err; | |
1da177e4 LT |
1275 | return 0; |
1276 | out_err: | |
1da177e4 LT |
1277 | d_drop(dentry); |
1278 | return error; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * See comments for nfs_proc_create regarding failed operations. | |
1283 | */ | |
1284 | static int | |
1285 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1286 | { | |
1287 | struct iattr attr; | |
1288 | int status; | |
1289 | ||
1e7cb3dc CL |
1290 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1291 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1292 | |
1293 | if (!new_valid_dev(rdev)) | |
1294 | return -EINVAL; | |
1295 | ||
1296 | attr.ia_mode = mode; | |
1297 | attr.ia_valid = ATTR_MODE; | |
1298 | ||
1da177e4 | 1299 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1300 | if (status != 0) |
1301 | goto out_err; | |
1da177e4 LT |
1302 | return 0; |
1303 | out_err: | |
1da177e4 LT |
1304 | d_drop(dentry); |
1305 | return status; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * See comments for nfs_proc_create regarding failed operations. | |
1310 | */ | |
1311 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1312 | { | |
1313 | struct iattr attr; | |
1314 | int error; | |
1315 | ||
1e7cb3dc CL |
1316 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1317 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1318 | |
1319 | attr.ia_valid = ATTR_MODE; | |
1320 | attr.ia_mode = mode | S_IFDIR; | |
1321 | ||
1da177e4 | 1322 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1323 | if (error != 0) |
1324 | goto out_err; | |
1da177e4 LT |
1325 | return 0; |
1326 | out_err: | |
1327 | d_drop(dentry); | |
1da177e4 LT |
1328 | return error; |
1329 | } | |
1330 | ||
d45b9d8b TM |
1331 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1332 | { | |
1333 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1334 | d_delete(dentry); | |
1335 | } | |
1336 | ||
1da177e4 LT |
1337 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1338 | { | |
1339 | int error; | |
1340 | ||
1e7cb3dc CL |
1341 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1342 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1343 | |
1da177e4 LT |
1344 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1345 | /* Ensure the VFS deletes this inode */ | |
1346 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1347 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1348 | else if (error == -ENOENT) |
1349 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1350 | |
1351 | return error; | |
1352 | } | |
1353 | ||
1354 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) | |
1355 | { | |
1356 | static unsigned int sillycounter; | |
4e769b93 | 1357 | const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2; |
1da177e4 | 1358 | const int countersize = sizeof(sillycounter)*2; |
4e769b93 | 1359 | const int slen = sizeof(".nfs")+fileidsize+countersize-1; |
1da177e4 LT |
1360 | char silly[slen+1]; |
1361 | struct qstr qsilly; | |
1362 | struct dentry *sdentry; | |
1363 | int error = -EIO; | |
1364 | ||
1365 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", | |
1366 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1367 | atomic_read(&dentry->d_count)); | |
91d5b470 | 1368 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
1da177e4 | 1369 | |
1da177e4 LT |
1370 | /* |
1371 | * We don't allow a dentry to be silly-renamed twice. | |
1372 | */ | |
1373 | error = -EBUSY; | |
1374 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1375 | goto out; | |
1376 | ||
4e769b93 PS |
1377 | sprintf(silly, ".nfs%*.*Lx", |
1378 | fileidsize, fileidsize, | |
1379 | (unsigned long long)NFS_FILEID(dentry->d_inode)); | |
1da177e4 | 1380 | |
34ea8188 TM |
1381 | /* Return delegation in anticipation of the rename */ |
1382 | nfs_inode_return_delegation(dentry->d_inode); | |
1383 | ||
1da177e4 LT |
1384 | sdentry = NULL; |
1385 | do { | |
1386 | char *suffix = silly + slen - countersize; | |
1387 | ||
1388 | dput(sdentry); | |
1389 | sillycounter++; | |
1390 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); | |
1391 | ||
1e7cb3dc CL |
1392 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
1393 | dentry->d_name.name, silly); | |
1da177e4 LT |
1394 | |
1395 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); | |
1396 | /* | |
1397 | * N.B. Better to return EBUSY here ... it could be | |
1398 | * dangerous to delete the file while it's in use. | |
1399 | */ | |
1400 | if (IS_ERR(sdentry)) | |
1401 | goto out; | |
1402 | } while(sdentry->d_inode != NULL); /* need negative lookup */ | |
1403 | ||
1404 | qsilly.name = silly; | |
1405 | qsilly.len = strlen(silly); | |
1da177e4 | 1406 | if (dentry->d_inode) { |
1da177e4 LT |
1407 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
1408 | dir, &qsilly); | |
5ba7cc48 | 1409 | nfs_mark_for_revalidate(dentry->d_inode); |
1da177e4 LT |
1410 | } else |
1411 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, | |
1412 | dir, &qsilly); | |
1da177e4 | 1413 | if (!error) { |
1da177e4 LT |
1414 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1415 | d_move(dentry, sdentry); | |
e4eff1a6 | 1416 | error = nfs_async_unlink(dir, dentry); |
1da177e4 LT |
1417 | /* If we return 0 we don't unlink */ |
1418 | } | |
1419 | dput(sdentry); | |
1420 | out: | |
1421 | return error; | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * Remove a file after making sure there are no pending writes, | |
1426 | * and after checking that the file has only one user. | |
1427 | * | |
1428 | * We invalidate the attribute cache and free the inode prior to the operation | |
1429 | * to avoid possible races if the server reuses the inode. | |
1430 | */ | |
1431 | static int nfs_safe_remove(struct dentry *dentry) | |
1432 | { | |
1433 | struct inode *dir = dentry->d_parent->d_inode; | |
1434 | struct inode *inode = dentry->d_inode; | |
1435 | int error = -EBUSY; | |
1436 | ||
1437 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1438 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1439 | ||
1440 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1441 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1442 | error = 0; | |
1443 | goto out; | |
1444 | } | |
1445 | ||
1da177e4 | 1446 | if (inode != NULL) { |
cae7a073 | 1447 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1448 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1449 | /* The VFS may want to delete this inode */ | |
1450 | if (error == 0) | |
1b83d707 | 1451 | nfs_drop_nlink(inode); |
5ba7cc48 | 1452 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1453 | } else |
1454 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1455 | if (error == -ENOENT) |
1456 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1457 | out: |
1458 | return error; | |
1459 | } | |
1460 | ||
1461 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1462 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1463 | * | |
1464 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1465 | */ | |
1466 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1467 | { | |
1468 | int error; | |
1469 | int need_rehash = 0; | |
1470 | ||
1471 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1472 | dir->i_ino, dentry->d_name.name); | |
1473 | ||
1da177e4 LT |
1474 | spin_lock(&dcache_lock); |
1475 | spin_lock(&dentry->d_lock); | |
1476 | if (atomic_read(&dentry->d_count) > 1) { | |
1477 | spin_unlock(&dentry->d_lock); | |
1478 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1479 | /* Start asynchronous writeout of the inode */ |
1480 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1481 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1482 | return error; |
1483 | } | |
1484 | if (!d_unhashed(dentry)) { | |
1485 | __d_drop(dentry); | |
1486 | need_rehash = 1; | |
1487 | } | |
1488 | spin_unlock(&dentry->d_lock); | |
1489 | spin_unlock(&dcache_lock); | |
1490 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1491 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1492 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1493 | } else if (need_rehash) | |
1494 | d_rehash(dentry); | |
1da177e4 LT |
1495 | return error; |
1496 | } | |
1497 | ||
873101b3 CL |
1498 | /* |
1499 | * To create a symbolic link, most file systems instantiate a new inode, | |
1500 | * add a page to it containing the path, then write it out to the disk | |
1501 | * using prepare_write/commit_write. | |
1502 | * | |
1503 | * Unfortunately the NFS client can't create the in-core inode first | |
1504 | * because it needs a file handle to create an in-core inode (see | |
1505 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1506 | * symlink request has completed on the server. | |
1507 | * | |
1508 | * So instead we allocate a raw page, copy the symname into it, then do | |
1509 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1510 | * now have a new file handle and can instantiate an in-core NFS inode | |
1511 | * and move the raw page into its mapping. | |
1512 | */ | |
1513 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1514 | { |
873101b3 CL |
1515 | struct pagevec lru_pvec; |
1516 | struct page *page; | |
1517 | char *kaddr; | |
1da177e4 | 1518 | struct iattr attr; |
873101b3 | 1519 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1520 | int error; |
1521 | ||
1522 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1523 | dir->i_ino, dentry->d_name.name, symname); | |
1524 | ||
873101b3 CL |
1525 | if (pathlen > PAGE_SIZE) |
1526 | return -ENAMETOOLONG; | |
1da177e4 | 1527 | |
873101b3 CL |
1528 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1529 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1530 | |
83d93f22 | 1531 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1532 | if (!page) |
873101b3 | 1533 | return -ENOMEM; |
873101b3 CL |
1534 | |
1535 | kaddr = kmap_atomic(page, KM_USER0); | |
1536 | memcpy(kaddr, symname, pathlen); | |
1537 | if (pathlen < PAGE_SIZE) | |
1538 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1539 | kunmap_atomic(kaddr, KM_USER0); | |
1540 | ||
94a6d753 | 1541 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1542 | if (error != 0) { |
1543 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1544 | dir->i_sb->s_id, dir->i_ino, | |
1545 | dentry->d_name.name, symname, error); | |
1da177e4 | 1546 | d_drop(dentry); |
873101b3 | 1547 | __free_page(page); |
873101b3 CL |
1548 | return error; |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * No big deal if we can't add this page to the page cache here. | |
1553 | * READLINK will get the missing page from the server if needed. | |
1554 | */ | |
1555 | pagevec_init(&lru_pvec, 0); | |
1556 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1557 | GFP_KERNEL)) { | |
39cf8a13 | 1558 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1559 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1560 | SetPageUptodate(page); |
1561 | unlock_page(page); | |
1562 | } else | |
1563 | __free_page(page); | |
1564 | ||
873101b3 | 1565 | return 0; |
1da177e4 LT |
1566 | } |
1567 | ||
1568 | static int | |
1569 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1570 | { | |
1571 | struct inode *inode = old_dentry->d_inode; | |
1572 | int error; | |
1573 | ||
1574 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1575 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1576 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1577 | ||
9a3936aa TM |
1578 | nfs_inode_return_delegation(inode); |
1579 | ||
9697d234 | 1580 | d_drop(dentry); |
1da177e4 | 1581 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 TM |
1582 | if (error == 0) { |
1583 | atomic_inc(&inode->i_count); | |
9697d234 | 1584 | d_add(dentry, inode); |
cf809556 | 1585 | } |
1da177e4 LT |
1586 | return error; |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * RENAME | |
1591 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1592 | * different file handle for the same inode after a rename (e.g. when | |
1593 | * moving to a different directory). A fail-safe method to do so would | |
1594 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1595 | * rename the old file using the sillyrename stuff. This way, the original | |
1596 | * file in old_dir will go away when the last process iput()s the inode. | |
1597 | * | |
1598 | * FIXED. | |
1599 | * | |
1600 | * It actually works quite well. One needs to have the possibility for | |
1601 | * at least one ".nfs..." file in each directory the file ever gets | |
1602 | * moved or linked to which happens automagically with the new | |
1603 | * implementation that only depends on the dcache stuff instead of | |
1604 | * using the inode layer | |
1605 | * | |
1606 | * Unfortunately, things are a little more complicated than indicated | |
1607 | * above. For a cross-directory move, we want to make sure we can get | |
1608 | * rid of the old inode after the operation. This means there must be | |
1609 | * no pending writes (if it's a file), and the use count must be 1. | |
1610 | * If these conditions are met, we can drop the dentries before doing | |
1611 | * the rename. | |
1612 | */ | |
1613 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1614 | struct inode *new_dir, struct dentry *new_dentry) | |
1615 | { | |
1616 | struct inode *old_inode = old_dentry->d_inode; | |
1617 | struct inode *new_inode = new_dentry->d_inode; | |
1618 | struct dentry *dentry = NULL, *rehash = NULL; | |
1619 | int error = -EBUSY; | |
1620 | ||
1da177e4 LT |
1621 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1622 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1623 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1624 | atomic_read(&new_dentry->d_count)); | |
1625 | ||
1626 | /* | |
28f79a1a MS |
1627 | * For non-directories, check whether the target is busy and if so, |
1628 | * make a copy of the dentry and then do a silly-rename. If the | |
1629 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1630 | * the new target. | |
1da177e4 | 1631 | */ |
27226104 MS |
1632 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1633 | /* | |
1634 | * To prevent any new references to the target during the | |
1635 | * rename, we unhash the dentry in advance. | |
1636 | */ | |
1637 | if (!d_unhashed(new_dentry)) { | |
1638 | d_drop(new_dentry); | |
1639 | rehash = new_dentry; | |
1640 | } | |
1da177e4 | 1641 | |
27226104 MS |
1642 | if (atomic_read(&new_dentry->d_count) > 2) { |
1643 | int err; | |
1644 | ||
1645 | /* copy the target dentry's name */ | |
1646 | dentry = d_alloc(new_dentry->d_parent, | |
1647 | &new_dentry->d_name); | |
1648 | if (!dentry) | |
1649 | goto out; | |
1650 | ||
1651 | /* silly-rename the existing target ... */ | |
1652 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1653 | if (err) |
27226104 | 1654 | goto out; |
24e93025 MS |
1655 | |
1656 | new_dentry = dentry; | |
56335936 | 1657 | rehash = NULL; |
24e93025 | 1658 | new_inode = NULL; |
27226104 | 1659 | } |
b1e4adf4 | 1660 | } |
1da177e4 | 1661 | |
cae7a073 | 1662 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1663 | if (new_inode != NULL) |
24174119 | 1664 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1665 | |
1da177e4 LT |
1666 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1667 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1668 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1669 | out: |
1670 | if (rehash) | |
1671 | d_rehash(rehash); | |
1672 | if (!error) { | |
b1e4adf4 TM |
1673 | if (new_inode != NULL) |
1674 | nfs_drop_nlink(new_inode); | |
349457cc | 1675 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1676 | nfs_set_verifier(new_dentry, |
1677 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1678 | } else if (error == -ENOENT) |
1679 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1680 | |
1681 | /* new dentry created? */ | |
1682 | if (dentry) | |
1683 | dput(dentry); | |
1da177e4 LT |
1684 | return error; |
1685 | } | |
1686 | ||
cfcea3e8 TM |
1687 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1688 | static LIST_HEAD(nfs_access_lru_list); | |
1689 | static atomic_long_t nfs_access_nr_entries; | |
1690 | ||
1c3c07e9 TM |
1691 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1692 | { | |
1693 | put_rpccred(entry->cred); | |
1694 | kfree(entry); | |
cfcea3e8 TM |
1695 | smp_mb__before_atomic_dec(); |
1696 | atomic_long_dec(&nfs_access_nr_entries); | |
1697 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1698 | } |
1699 | ||
1a81bb8a TM |
1700 | static void nfs_access_free_list(struct list_head *head) |
1701 | { | |
1702 | struct nfs_access_entry *cache; | |
1703 | ||
1704 | while (!list_empty(head)) { | |
1705 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1706 | list_del(&cache->lru); | |
1707 | nfs_access_free_entry(cache); | |
1708 | } | |
1709 | } | |
1710 | ||
7f8275d0 | 1711 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
1712 | { |
1713 | LIST_HEAD(head); | |
1714 | struct nfs_inode *nfsi; | |
1715 | struct nfs_access_entry *cache; | |
1716 | ||
61d5eb29 TM |
1717 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1718 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1719 | |
a50f7951 | 1720 | spin_lock(&nfs_access_lru_lock); |
979df72e TM |
1721 | list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) { |
1722 | struct inode *inode; | |
1723 | ||
1724 | if (nr_to_scan-- == 0) | |
1725 | break; | |
9c7e7e23 | 1726 | inode = &nfsi->vfs_inode; |
979df72e TM |
1727 | spin_lock(&inode->i_lock); |
1728 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1729 | goto remove_lru_entry; | |
1730 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1731 | struct nfs_access_entry, lru); | |
1732 | list_move(&cache->lru, &head); | |
1733 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1734 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1735 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1736 | &nfs_access_lru_list); | |
1737 | else { | |
1738 | remove_lru_entry: | |
1739 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1740 | smp_mb__before_clear_bit(); |
979df72e | 1741 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1742 | smp_mb__after_clear_bit(); |
979df72e | 1743 | } |
59844a9b | 1744 | spin_unlock(&inode->i_lock); |
979df72e TM |
1745 | } |
1746 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1747 | nfs_access_free_list(&head); |
979df72e TM |
1748 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1749 | } | |
1750 | ||
1a81bb8a | 1751 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1752 | { |
1c3c07e9 | 1753 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1754 | struct rb_node *n; |
1c3c07e9 TM |
1755 | struct nfs_access_entry *entry; |
1756 | ||
1757 | /* Unhook entries from the cache */ | |
1758 | while ((n = rb_first(root_node)) != NULL) { | |
1759 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1760 | rb_erase(n, root_node); | |
1a81bb8a | 1761 | list_move(&entry->lru, head); |
1c3c07e9 TM |
1762 | } |
1763 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
1764 | } |
1765 | ||
1c3c07e9 | 1766 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1767 | { |
1a81bb8a TM |
1768 | LIST_HEAD(head); |
1769 | ||
1770 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
1771 | return; | |
cfcea3e8 | 1772 | /* Remove from global LRU init */ |
1a81bb8a TM |
1773 | spin_lock(&nfs_access_lru_lock); |
1774 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 1775 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 1776 | |
1c3c07e9 | 1777 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
1778 | __nfs_access_zap_cache(NFS_I(inode), &head); |
1779 | spin_unlock(&inode->i_lock); | |
1780 | spin_unlock(&nfs_access_lru_lock); | |
1781 | nfs_access_free_list(&head); | |
1c3c07e9 | 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; | |
b4d2314b | 1814 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 1815 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
1816 | goto out_stale; |
1817 | res->jiffies = cache->jiffies; | |
1818 | res->cred = cache->cred; | |
1819 | res->mask = cache->mask; | |
cfcea3e8 | 1820 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
1821 | err = 0; |
1822 | out: | |
1823 | spin_unlock(&inode->i_lock); | |
1824 | return err; | |
1825 | out_stale: | |
1826 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 1827 | list_del(&cache->lru); |
1c3c07e9 TM |
1828 | spin_unlock(&inode->i_lock); |
1829 | nfs_access_free_entry(cache); | |
1830 | return -ENOENT; | |
1831 | out_zap: | |
1a81bb8a TM |
1832 | spin_unlock(&inode->i_lock); |
1833 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
1834 | return -ENOENT; |
1835 | } | |
1836 | ||
1837 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
1838 | { | |
cfcea3e8 TM |
1839 | struct nfs_inode *nfsi = NFS_I(inode); |
1840 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
1841 | struct rb_node **p = &root_node->rb_node; |
1842 | struct rb_node *parent = NULL; | |
1843 | struct nfs_access_entry *entry; | |
1844 | ||
1845 | spin_lock(&inode->i_lock); | |
1846 | while (*p != NULL) { | |
1847 | parent = *p; | |
1848 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
1849 | ||
1850 | if (set->cred < entry->cred) | |
1851 | p = &parent->rb_left; | |
1852 | else if (set->cred > entry->cred) | |
1853 | p = &parent->rb_right; | |
1854 | else | |
1855 | goto found; | |
1856 | } | |
1857 | rb_link_node(&set->rb_node, parent, p); | |
1858 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 1859 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 1860 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
1861 | return; |
1862 | found: | |
1863 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
1864 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
1865 | list_del(&entry->lru); | |
1c3c07e9 TM |
1866 | spin_unlock(&inode->i_lock); |
1867 | nfs_access_free_entry(entry); | |
1868 | } | |
1869 | ||
af22f94a | 1870 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
1871 | { |
1872 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
1873 | if (cache == NULL) | |
1874 | return; | |
1875 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 1876 | cache->jiffies = set->jiffies; |
1c3c07e9 | 1877 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 1878 | cache->mask = set->mask; |
1c3c07e9 TM |
1879 | |
1880 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
1881 | |
1882 | /* Update accounting */ | |
1883 | smp_mb__before_atomic_inc(); | |
1884 | atomic_long_inc(&nfs_access_nr_entries); | |
1885 | smp_mb__after_atomic_inc(); | |
1886 | ||
1887 | /* Add inode to global LRU list */ | |
1a81bb8a | 1888 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 1889 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
1890 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
1891 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
1892 | &nfs_access_lru_list); | |
cfcea3e8 TM |
1893 | spin_unlock(&nfs_access_lru_lock); |
1894 | } | |
1da177e4 LT |
1895 | } |
1896 | ||
1897 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
1898 | { | |
1899 | struct nfs_access_entry cache; | |
1900 | int status; | |
1901 | ||
1902 | status = nfs_access_get_cached(inode, cred, &cache); | |
1903 | if (status == 0) | |
1904 | goto out; | |
1905 | ||
1906 | /* Be clever: ask server to check for all possible rights */ | |
1907 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
1908 | cache.cred = cred; | |
1909 | cache.jiffies = jiffies; | |
1910 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
1911 | if (status != 0) { |
1912 | if (status == -ESTALE) { | |
1913 | nfs_zap_caches(inode); | |
1914 | if (!S_ISDIR(inode->i_mode)) | |
1915 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
1916 | } | |
1da177e4 | 1917 | return status; |
a71ee337 | 1918 | } |
1da177e4 LT |
1919 | nfs_access_add_cache(inode, &cache); |
1920 | out: | |
e6305c43 | 1921 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
1922 | return 0; |
1923 | return -EACCES; | |
1924 | } | |
1925 | ||
af22f94a TM |
1926 | static int nfs_open_permission_mask(int openflags) |
1927 | { | |
1928 | int mask = 0; | |
1929 | ||
1930 | if (openflags & FMODE_READ) | |
1931 | mask |= MAY_READ; | |
1932 | if (openflags & FMODE_WRITE) | |
1933 | mask |= MAY_WRITE; | |
1934 | if (openflags & FMODE_EXEC) | |
1935 | mask |= MAY_EXEC; | |
1936 | return mask; | |
1937 | } | |
1938 | ||
1939 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
1940 | { | |
1941 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
1942 | } | |
1943 | ||
e6305c43 | 1944 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
1945 | { |
1946 | struct rpc_cred *cred; | |
1947 | int res = 0; | |
1948 | ||
91d5b470 CL |
1949 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
1950 | ||
e6305c43 | 1951 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
1952 | goto out; |
1953 | /* Is this sys_access() ? */ | |
9cfcac81 | 1954 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
1955 | goto force_lookup; |
1956 | ||
1957 | switch (inode->i_mode & S_IFMT) { | |
1958 | case S_IFLNK: | |
1959 | goto out; | |
1960 | case S_IFREG: | |
1961 | /* NFSv4 has atomic_open... */ | |
1962 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
1963 | && (mask & MAY_OPEN) |
1964 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
1965 | goto out; |
1966 | break; | |
1967 | case S_IFDIR: | |
1968 | /* | |
1969 | * Optimize away all write operations, since the server | |
1970 | * will check permissions when we perform the op. | |
1971 | */ | |
1972 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
1973 | goto out; | |
1974 | } | |
1975 | ||
1976 | force_lookup: | |
1da177e4 LT |
1977 | if (!NFS_PROTO(inode)->access) |
1978 | goto out_notsup; | |
1979 | ||
98a8e323 | 1980 | cred = rpc_lookup_cred(); |
1da177e4 LT |
1981 | if (!IS_ERR(cred)) { |
1982 | res = nfs_do_access(inode, cred, mask); | |
1983 | put_rpccred(cred); | |
1984 | } else | |
1985 | res = PTR_ERR(cred); | |
1da177e4 | 1986 | out: |
f696a365 MS |
1987 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
1988 | res = -EACCES; | |
1989 | ||
1e7cb3dc CL |
1990 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
1991 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
1992 | return res; |
1993 | out_notsup: | |
1994 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1995 | if (res == 0) | |
1996 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 1997 | goto out; |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | /* | |
2001 | * Local variables: | |
2002 | * version-control: t | |
2003 | * kept-new-versions: 5 | |
2004 | * End: | |
2005 | */ |