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> | |
32 | #include <linux/smp_lock.h> | |
33 | #include <linux/namei.h> | |
34 | ||
4ce79717 | 35 | #include "nfs4_fs.h" |
1da177e4 | 36 | #include "delegation.h" |
91d5b470 | 37 | #include "iostat.h" |
1da177e4 LT |
38 | |
39 | #define NFS_PARANOIA 1 | |
40 | /* #define NFS_DEBUG_VERBOSE 1 */ | |
41 | ||
42 | static int nfs_opendir(struct inode *, struct file *); | |
43 | static int nfs_readdir(struct file *, void *, filldir_t); | |
44 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
45 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
46 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
47 | static int nfs_rmdir(struct inode *, struct dentry *); | |
48 | static int nfs_unlink(struct inode *, struct dentry *); | |
49 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
50 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
51 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
52 | static int nfs_rename(struct inode *, struct dentry *, | |
53 | struct inode *, struct dentry *); | |
54 | static int nfs_fsync_dir(struct file *, struct dentry *, int); | |
f0dd2136 | 55 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
1da177e4 | 56 | |
4b6f5d20 | 57 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 58 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
59 | .read = generic_read_dir, |
60 | .readdir = nfs_readdir, | |
61 | .open = nfs_opendir, | |
62 | .release = nfs_release, | |
63 | .fsync = nfs_fsync_dir, | |
64 | }; | |
65 | ||
66 | struct inode_operations nfs_dir_inode_operations = { | |
67 | .create = nfs_create, | |
68 | .lookup = nfs_lookup, | |
69 | .link = nfs_link, | |
70 | .unlink = nfs_unlink, | |
71 | .symlink = nfs_symlink, | |
72 | .mkdir = nfs_mkdir, | |
73 | .rmdir = nfs_rmdir, | |
74 | .mknod = nfs_mknod, | |
75 | .rename = nfs_rename, | |
76 | .permission = nfs_permission, | |
77 | .getattr = nfs_getattr, | |
78 | .setattr = nfs_setattr, | |
79 | }; | |
80 | ||
b7fa0554 AG |
81 | #ifdef CONFIG_NFS_V3 |
82 | struct inode_operations nfs3_dir_inode_operations = { | |
83 | .create = nfs_create, | |
84 | .lookup = nfs_lookup, | |
85 | .link = nfs_link, | |
86 | .unlink = nfs_unlink, | |
87 | .symlink = nfs_symlink, | |
88 | .mkdir = nfs_mkdir, | |
89 | .rmdir = nfs_rmdir, | |
90 | .mknod = nfs_mknod, | |
91 | .rename = nfs_rename, | |
92 | .permission = nfs_permission, | |
93 | .getattr = nfs_getattr, | |
94 | .setattr = nfs_setattr, | |
95 | .listxattr = nfs3_listxattr, | |
96 | .getxattr = nfs3_getxattr, | |
97 | .setxattr = nfs3_setxattr, | |
98 | .removexattr = nfs3_removexattr, | |
99 | }; | |
100 | #endif /* CONFIG_NFS_V3 */ | |
101 | ||
1da177e4 LT |
102 | #ifdef CONFIG_NFS_V4 |
103 | ||
104 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
105 | struct inode_operations nfs4_dir_inode_operations = { | |
106 | .create = nfs_create, | |
107 | .lookup = nfs_atomic_lookup, | |
108 | .link = nfs_link, | |
109 | .unlink = nfs_unlink, | |
110 | .symlink = nfs_symlink, | |
111 | .mkdir = nfs_mkdir, | |
112 | .rmdir = nfs_rmdir, | |
113 | .mknod = nfs_mknod, | |
114 | .rename = nfs_rename, | |
115 | .permission = nfs_permission, | |
116 | .getattr = nfs_getattr, | |
117 | .setattr = nfs_setattr, | |
6b3b5496 BF |
118 | .getxattr = nfs4_getxattr, |
119 | .setxattr = nfs4_setxattr, | |
120 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
121 | }; |
122 | ||
123 | #endif /* CONFIG_NFS_V4 */ | |
124 | ||
125 | /* | |
126 | * Open file | |
127 | */ | |
128 | static int | |
129 | nfs_opendir(struct inode *inode, struct file *filp) | |
130 | { | |
7451c4f0 | 131 | int res; |
1da177e4 | 132 | |
1e7cb3dc CL |
133 | dfprintk(VFS, "NFS: opendir(%s/%ld)\n", |
134 | inode->i_sb->s_id, inode->i_ino); | |
135 | ||
1da177e4 LT |
136 | lock_kernel(); |
137 | /* Call generic open code in order to cache credentials */ | |
7451c4f0 | 138 | res = nfs_open(inode, filp); |
1da177e4 LT |
139 | unlock_kernel(); |
140 | return res; | |
141 | } | |
142 | ||
143 | typedef u32 * (*decode_dirent_t)(u32 *, struct nfs_entry *, int); | |
144 | typedef struct { | |
145 | struct file *file; | |
146 | struct page *page; | |
147 | unsigned long page_index; | |
148 | u32 *ptr; | |
f0dd2136 TM |
149 | u64 *dir_cookie; |
150 | loff_t current_index; | |
1da177e4 LT |
151 | struct nfs_entry *entry; |
152 | decode_dirent_t decode; | |
153 | int plus; | |
154 | int error; | |
155 | } nfs_readdir_descriptor_t; | |
156 | ||
157 | /* Now we cache directories properly, by stuffing the dirent | |
158 | * data directly in the page cache. | |
159 | * | |
160 | * Inode invalidation due to refresh etc. takes care of | |
161 | * _everything_, no sloppy entry flushing logic, no extraneous | |
162 | * copying, network direct to page cache, the way it was meant | |
163 | * to be. | |
164 | * | |
165 | * NOTE: Dirent information verification is done always by the | |
166 | * page-in of the RPC reply, nowhere else, this simplies | |
167 | * things substantially. | |
168 | */ | |
169 | static | |
170 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) | |
171 | { | |
172 | struct file *file = desc->file; | |
173 | struct inode *inode = file->f_dentry->d_inode; | |
174 | struct rpc_cred *cred = nfs_file_cred(file); | |
175 | unsigned long timestamp; | |
176 | int error; | |
177 | ||
1e7cb3dc CL |
178 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
179 | __FUNCTION__, (long long)desc->entry->cookie, | |
180 | page->index); | |
1da177e4 LT |
181 | |
182 | again: | |
183 | timestamp = jiffies; | |
184 | error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->entry->cookie, page, | |
185 | NFS_SERVER(inode)->dtsize, desc->plus); | |
186 | if (error < 0) { | |
187 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
188 | if (error == -ENOTSUPP && desc->plus) { | |
189 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
412d582e | 190 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
1da177e4 LT |
191 | desc->plus = 0; |
192 | goto again; | |
193 | } | |
194 | goto error; | |
195 | } | |
196 | SetPageUptodate(page); | |
dc59250c | 197 | spin_lock(&inode->i_lock); |
55296809 | 198 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
dc59250c | 199 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
200 | /* Ensure consistent page alignment of the data. |
201 | * Note: assumes we have exclusive access to this mapping either | |
1b1dcc1b | 202 | * through inode->i_mutex or some other mechanism. |
1da177e4 | 203 | */ |
a656db99 TM |
204 | if (page->index == 0) |
205 | invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1); | |
1da177e4 LT |
206 | unlock_page(page); |
207 | return 0; | |
208 | error: | |
209 | SetPageError(page); | |
210 | unlock_page(page); | |
211 | nfs_zap_caches(inode); | |
212 | desc->error = error; | |
213 | return -EIO; | |
214 | } | |
215 | ||
216 | static inline | |
217 | int dir_decode(nfs_readdir_descriptor_t *desc) | |
218 | { | |
219 | u32 *p = desc->ptr; | |
220 | p = desc->decode(p, desc->entry, desc->plus); | |
221 | if (IS_ERR(p)) | |
222 | return PTR_ERR(p); | |
223 | desc->ptr = p; | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static inline | |
228 | void dir_page_release(nfs_readdir_descriptor_t *desc) | |
229 | { | |
230 | kunmap(desc->page); | |
231 | page_cache_release(desc->page); | |
232 | desc->page = NULL; | |
233 | desc->ptr = NULL; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Given a pointer to a buffer that has already been filled by a call | |
f0dd2136 | 238 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
1da177e4 LT |
239 | * |
240 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
241 | * return the offset within the buffer of the next entry to be | |
242 | * read. | |
243 | */ | |
244 | static inline | |
00a92642 | 245 | int find_dirent(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
246 | { |
247 | struct nfs_entry *entry = desc->entry; | |
248 | int loop_count = 0, | |
249 | status; | |
250 | ||
251 | while((status = dir_decode(desc)) == 0) { | |
1e7cb3dc CL |
252 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
253 | __FUNCTION__, (unsigned long long)entry->cookie); | |
f0dd2136 | 254 | if (entry->prev_cookie == *desc->dir_cookie) |
1da177e4 LT |
255 | break; |
256 | if (loop_count++ > 200) { | |
257 | loop_count = 0; | |
258 | schedule(); | |
259 | } | |
260 | } | |
1da177e4 LT |
261 | return status; |
262 | } | |
263 | ||
264 | /* | |
00a92642 | 265 | * Given a pointer to a buffer that has already been filled by a call |
f0dd2136 | 266 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
00a92642 OG |
267 | * |
268 | * If the end of the buffer has been reached, return -EAGAIN, if not, | |
269 | * return the offset within the buffer of the next entry to be | |
270 | * read. | |
271 | */ | |
272 | static inline | |
273 | int find_dirent_index(nfs_readdir_descriptor_t *desc) | |
274 | { | |
275 | struct nfs_entry *entry = desc->entry; | |
276 | int loop_count = 0, | |
277 | status; | |
278 | ||
279 | for(;;) { | |
280 | status = dir_decode(desc); | |
281 | if (status) | |
282 | break; | |
283 | ||
1e7cb3dc CL |
284 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
285 | (unsigned long long)entry->cookie, desc->current_index); | |
00a92642 | 286 | |
f0dd2136 TM |
287 | if (desc->file->f_pos == desc->current_index) { |
288 | *desc->dir_cookie = entry->cookie; | |
00a92642 OG |
289 | break; |
290 | } | |
291 | desc->current_index++; | |
292 | if (loop_count++ > 200) { | |
293 | loop_count = 0; | |
294 | schedule(); | |
295 | } | |
296 | } | |
00a92642 OG |
297 | return status; |
298 | } | |
299 | ||
300 | /* | |
301 | * Find the given page, and call find_dirent() or find_dirent_index in | |
302 | * order to try to return the next entry. | |
1da177e4 LT |
303 | */ |
304 | static inline | |
305 | int find_dirent_page(nfs_readdir_descriptor_t *desc) | |
306 | { | |
307 | struct inode *inode = desc->file->f_dentry->d_inode; | |
308 | struct page *page; | |
309 | int status; | |
310 | ||
1e7cb3dc CL |
311 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
312 | __FUNCTION__, desc->page_index, | |
313 | (long long) *desc->dir_cookie); | |
1da177e4 LT |
314 | |
315 | page = read_cache_page(inode->i_mapping, desc->page_index, | |
316 | (filler_t *)nfs_readdir_filler, desc); | |
317 | if (IS_ERR(page)) { | |
318 | status = PTR_ERR(page); | |
319 | goto out; | |
320 | } | |
321 | if (!PageUptodate(page)) | |
322 | goto read_error; | |
323 | ||
324 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ | |
325 | desc->page = page; | |
326 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
f0dd2136 | 327 | if (*desc->dir_cookie != 0) |
00a92642 OG |
328 | status = find_dirent(desc); |
329 | else | |
330 | status = find_dirent_index(desc); | |
1da177e4 LT |
331 | if (status < 0) |
332 | dir_page_release(desc); | |
333 | out: | |
1e7cb3dc | 334 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, status); |
1da177e4 LT |
335 | return status; |
336 | read_error: | |
337 | page_cache_release(page); | |
338 | return -EIO; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Recurse through the page cache pages, and return a | |
343 | * filled nfs_entry structure of the next directory entry if possible. | |
344 | * | |
f0dd2136 TM |
345 | * The target for the search is '*desc->dir_cookie' if non-0, |
346 | * 'desc->file->f_pos' otherwise | |
1da177e4 LT |
347 | */ |
348 | static inline | |
349 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
350 | { | |
351 | int loop_count = 0; | |
352 | int res; | |
353 | ||
00a92642 | 354 | /* Always search-by-index from the beginning of the cache */ |
f0dd2136 | 355 | if (*desc->dir_cookie == 0) { |
1e7cb3dc CL |
356 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
357 | (long long)desc->file->f_pos); | |
00a92642 OG |
358 | desc->page_index = 0; |
359 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
360 | desc->entry->eof = 0; | |
361 | desc->current_index = 0; | |
f0dd2136 | 362 | } else |
1e7cb3dc CL |
363 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
364 | (unsigned long long)*desc->dir_cookie); | |
00a92642 | 365 | |
1da177e4 LT |
366 | for (;;) { |
367 | res = find_dirent_page(desc); | |
368 | if (res != -EAGAIN) | |
369 | break; | |
370 | /* Align to beginning of next page */ | |
371 | desc->page_index ++; | |
372 | if (loop_count++ > 200) { | |
373 | loop_count = 0; | |
374 | schedule(); | |
375 | } | |
376 | } | |
1e7cb3dc CL |
377 | |
378 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, res); | |
1da177e4 LT |
379 | return res; |
380 | } | |
381 | ||
382 | static inline unsigned int dt_type(struct inode *inode) | |
383 | { | |
384 | return (inode->i_mode >> 12) & 15; | |
385 | } | |
386 | ||
387 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); | |
388 | ||
389 | /* | |
390 | * Once we've found the start of the dirent within a page: fill 'er up... | |
391 | */ | |
392 | static | |
393 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
394 | filldir_t filldir) | |
395 | { | |
396 | struct file *file = desc->file; | |
397 | struct nfs_entry *entry = desc->entry; | |
398 | struct dentry *dentry = NULL; | |
399 | unsigned long fileid; | |
400 | int loop_count = 0, | |
401 | res; | |
402 | ||
1e7cb3dc CL |
403 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
404 | (unsigned long long)entry->cookie); | |
1da177e4 LT |
405 | |
406 | for(;;) { | |
407 | unsigned d_type = DT_UNKNOWN; | |
408 | /* Note: entry->prev_cookie contains the cookie for | |
409 | * retrieving the current dirent on the server */ | |
410 | fileid = nfs_fileid_to_ino_t(entry->ino); | |
411 | ||
412 | /* Get a dentry if we have one */ | |
413 | if (dentry != NULL) | |
414 | dput(dentry); | |
415 | dentry = nfs_readdir_lookup(desc); | |
416 | ||
417 | /* Use readdirplus info */ | |
418 | if (dentry != NULL && dentry->d_inode != NULL) { | |
419 | d_type = dt_type(dentry->d_inode); | |
420 | fileid = dentry->d_inode->i_ino; | |
421 | } | |
422 | ||
423 | res = filldir(dirent, entry->name, entry->len, | |
00a92642 | 424 | file->f_pos, fileid, d_type); |
1da177e4 LT |
425 | if (res < 0) |
426 | break; | |
00a92642 | 427 | file->f_pos++; |
f0dd2136 | 428 | *desc->dir_cookie = entry->cookie; |
1da177e4 LT |
429 | if (dir_decode(desc) != 0) { |
430 | desc->page_index ++; | |
431 | break; | |
432 | } | |
433 | if (loop_count++ > 200) { | |
434 | loop_count = 0; | |
435 | schedule(); | |
436 | } | |
437 | } | |
438 | dir_page_release(desc); | |
439 | if (dentry != NULL) | |
440 | dput(dentry); | |
1e7cb3dc CL |
441 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
442 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
443 | return res; |
444 | } | |
445 | ||
446 | /* | |
447 | * If we cannot find a cookie in our cache, we suspect that this is | |
448 | * because it points to a deleted file, so we ask the server to return | |
449 | * whatever it thinks is the next entry. We then feed this to filldir. | |
450 | * If all goes well, we should then be able to find our way round the | |
451 | * cache on the next call to readdir_search_pagecache(); | |
452 | * | |
453 | * NOTE: we cannot add the anonymous page to the pagecache because | |
454 | * the data it contains might not be page aligned. Besides, | |
455 | * we should already have a complete representation of the | |
456 | * directory in the page cache by the time we get here. | |
457 | */ | |
458 | static inline | |
459 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
460 | filldir_t filldir) | |
461 | { | |
462 | struct file *file = desc->file; | |
463 | struct inode *inode = file->f_dentry->d_inode; | |
464 | struct rpc_cred *cred = nfs_file_cred(file); | |
465 | struct page *page = NULL; | |
466 | int status; | |
467 | ||
1e7cb3dc CL |
468 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
469 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
470 | |
471 | page = alloc_page(GFP_HIGHUSER); | |
472 | if (!page) { | |
473 | status = -ENOMEM; | |
474 | goto out; | |
475 | } | |
f0dd2136 | 476 | desc->error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, *desc->dir_cookie, |
1da177e4 LT |
477 | page, |
478 | NFS_SERVER(inode)->dtsize, | |
479 | desc->plus); | |
dc59250c | 480 | spin_lock(&inode->i_lock); |
55296809 | 481 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
dc59250c | 482 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
483 | desc->page = page; |
484 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ | |
485 | if (desc->error >= 0) { | |
486 | if ((status = dir_decode(desc)) == 0) | |
f0dd2136 | 487 | desc->entry->prev_cookie = *desc->dir_cookie; |
1da177e4 LT |
488 | } else |
489 | status = -EIO; | |
490 | if (status < 0) | |
491 | goto out_release; | |
492 | ||
493 | status = nfs_do_filldir(desc, dirent, filldir); | |
494 | ||
495 | /* Reset read descriptor so it searches the page cache from | |
496 | * the start upon the next call to readdir_search_pagecache() */ | |
497 | desc->page_index = 0; | |
498 | desc->entry->cookie = desc->entry->prev_cookie = 0; | |
499 | desc->entry->eof = 0; | |
500 | out: | |
1e7cb3dc CL |
501 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
502 | __FUNCTION__, status); | |
1da177e4 LT |
503 | return status; |
504 | out_release: | |
505 | dir_page_release(desc); | |
506 | goto out; | |
507 | } | |
508 | ||
00a92642 OG |
509 | /* The file offset position represents the dirent entry number. A |
510 | last cookie cache takes care of the common case of reading the | |
511 | whole directory. | |
1da177e4 LT |
512 | */ |
513 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
514 | { | |
515 | struct dentry *dentry = filp->f_dentry; | |
516 | struct inode *inode = dentry->d_inode; | |
517 | nfs_readdir_descriptor_t my_desc, | |
518 | *desc = &my_desc; | |
519 | struct nfs_entry my_entry; | |
520 | struct nfs_fh fh; | |
521 | struct nfs_fattr fattr; | |
522 | long res; | |
523 | ||
1e7cb3dc CL |
524 | dfprintk(VFS, "NFS: readdir(%s/%s) starting at cookie %Lu\n", |
525 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
526 | (long long)filp->f_pos); | |
91d5b470 CL |
527 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
528 | ||
1da177e4 LT |
529 | lock_kernel(); |
530 | ||
44b11874 | 531 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 LT |
532 | if (res < 0) { |
533 | unlock_kernel(); | |
534 | return res; | |
535 | } | |
536 | ||
537 | /* | |
00a92642 | 538 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 539 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
540 | * to either find the entry with the appropriate number or |
541 | * revalidate the cookie. | |
1da177e4 LT |
542 | */ |
543 | memset(desc, 0, sizeof(*desc)); | |
544 | ||
545 | desc->file = filp; | |
f0dd2136 | 546 | desc->dir_cookie = &((struct nfs_open_context *)filp->private_data)->dir_cookie; |
1da177e4 LT |
547 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
548 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
549 | ||
550 | my_entry.cookie = my_entry.prev_cookie = 0; | |
551 | my_entry.eof = 0; | |
552 | my_entry.fh = &fh; | |
553 | my_entry.fattr = &fattr; | |
0e574af1 | 554 | nfs_fattr_init(&fattr); |
1da177e4 LT |
555 | desc->entry = &my_entry; |
556 | ||
557 | while(!desc->entry->eof) { | |
558 | res = readdir_search_pagecache(desc); | |
00a92642 | 559 | |
1da177e4 LT |
560 | if (res == -EBADCOOKIE) { |
561 | /* This means either end of directory */ | |
f0dd2136 | 562 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
1da177e4 LT |
563 | /* Or that the server has 'lost' a cookie */ |
564 | res = uncached_readdir(desc, dirent, filldir); | |
565 | if (res >= 0) | |
566 | continue; | |
567 | } | |
568 | res = 0; | |
569 | break; | |
570 | } | |
571 | if (res == -ETOOSMALL && desc->plus) { | |
412d582e | 572 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
1da177e4 LT |
573 | nfs_zap_caches(inode); |
574 | desc->plus = 0; | |
575 | desc->entry->eof = 0; | |
576 | continue; | |
577 | } | |
578 | if (res < 0) | |
579 | break; | |
580 | ||
581 | res = nfs_do_filldir(desc, dirent, filldir); | |
582 | if (res < 0) { | |
583 | res = 0; | |
584 | break; | |
585 | } | |
586 | } | |
587 | unlock_kernel(); | |
1e7cb3dc CL |
588 | if (res > 0) |
589 | res = 0; | |
590 | dfprintk(VFS, "NFS: readdir(%s/%s) returns %ld\n", | |
591 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
592 | res); | |
593 | return res; | |
1da177e4 LT |
594 | } |
595 | ||
f0dd2136 TM |
596 | loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
597 | { | |
1b1dcc1b | 598 | mutex_lock(&filp->f_dentry->d_inode->i_mutex); |
f0dd2136 TM |
599 | switch (origin) { |
600 | case 1: | |
601 | offset += filp->f_pos; | |
602 | case 0: | |
603 | if (offset >= 0) | |
604 | break; | |
605 | default: | |
606 | offset = -EINVAL; | |
607 | goto out; | |
608 | } | |
609 | if (offset != filp->f_pos) { | |
610 | filp->f_pos = offset; | |
611 | ((struct nfs_open_context *)filp->private_data)->dir_cookie = 0; | |
612 | } | |
613 | out: | |
1b1dcc1b | 614 | mutex_unlock(&filp->f_dentry->d_inode->i_mutex); |
f0dd2136 TM |
615 | return offset; |
616 | } | |
617 | ||
1da177e4 LT |
618 | /* |
619 | * All directory operations under NFS are synchronous, so fsync() | |
620 | * is a dummy operation. | |
621 | */ | |
622 | int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync) | |
623 | { | |
1e7cb3dc CL |
624 | dfprintk(VFS, "NFS: fsync_dir(%s/%s) datasync %d\n", |
625 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
626 | datasync); | |
627 | ||
1da177e4 LT |
628 | return 0; |
629 | } | |
630 | ||
631 | /* | |
632 | * A check for whether or not the parent directory has changed. | |
633 | * In the case it has, we assume that the dentries are untrustworthy | |
634 | * and may need to be looked up again. | |
635 | */ | |
636 | static inline int nfs_check_verifier(struct inode *dir, struct dentry *dentry) | |
637 | { | |
638 | if (IS_ROOT(dentry)) | |
639 | return 1; | |
55296809 | 640 | if ((NFS_I(dir)->cache_validity & NFS_INO_INVALID_ATTR) != 0 |
1da177e4 LT |
641 | || nfs_attribute_timeout(dir)) |
642 | return 0; | |
643 | return nfs_verify_change_attribute(dir, (unsigned long)dentry->d_fsdata); | |
644 | } | |
645 | ||
646 | static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) | |
647 | { | |
648 | dentry->d_fsdata = (void *)verf; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Whenever an NFS operation succeeds, we know that the dentry | |
653 | * is valid, so we update the revalidation timestamp. | |
654 | */ | |
655 | static inline void nfs_renew_times(struct dentry * dentry) | |
656 | { | |
657 | dentry->d_time = jiffies; | |
658 | } | |
659 | ||
1d6757fb TM |
660 | /* |
661 | * Return the intent data that applies to this particular path component | |
662 | * | |
663 | * Note that the current set of intents only apply to the very last | |
664 | * component of the path. | |
665 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
666 | */ | |
667 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
668 | { | |
669 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
670 | return 0; | |
671 | return nd->flags & mask; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Inode and filehandle revalidation for lookups. | |
676 | * | |
677 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
678 | * or if the intent information indicates that we're about to open this | |
679 | * particular file and the "nocto" mount flag is not set. | |
680 | * | |
681 | */ | |
1da177e4 LT |
682 | static inline |
683 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
684 | { | |
685 | struct nfs_server *server = NFS_SERVER(inode); | |
686 | ||
687 | if (nd != NULL) { | |
1da177e4 | 688 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 689 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
690 | goto out_force; |
691 | /* This is an open(2) */ | |
1d6757fb | 692 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
693 | !(server->flags & NFS_MOUNT_NOCTO) && |
694 | (S_ISREG(inode->i_mode) || | |
695 | S_ISDIR(inode->i_mode))) | |
1da177e4 LT |
696 | goto out_force; |
697 | } | |
698 | return nfs_revalidate_inode(server, inode); | |
699 | out_force: | |
700 | return __nfs_revalidate_inode(server, inode); | |
701 | } | |
702 | ||
703 | /* | |
704 | * We judge how long we want to trust negative | |
705 | * dentries by looking at the parent inode mtime. | |
706 | * | |
707 | * If parent mtime has changed, we revalidate, else we wait for a | |
708 | * period corresponding to the parent's attribute cache timeout value. | |
709 | */ | |
710 | static inline | |
711 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
712 | struct nameidata *nd) | |
713 | { | |
1da177e4 | 714 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 715 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 LT |
716 | return 0; |
717 | return !nfs_check_verifier(dir, dentry); | |
718 | } | |
719 | ||
720 | /* | |
721 | * This is called every time the dcache has a lookup hit, | |
722 | * and we should check whether we can really trust that | |
723 | * lookup. | |
724 | * | |
725 | * NOTE! The hit can be a negative hit too, don't assume | |
726 | * we have an inode! | |
727 | * | |
728 | * If the parent directory is seen to have changed, we throw out the | |
729 | * cached dentry and do a new lookup. | |
730 | */ | |
731 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
732 | { | |
733 | struct inode *dir; | |
734 | struct inode *inode; | |
735 | struct dentry *parent; | |
736 | int error; | |
737 | struct nfs_fh fhandle; | |
738 | struct nfs_fattr fattr; | |
739 | unsigned long verifier; | |
740 | ||
741 | parent = dget_parent(dentry); | |
742 | lock_kernel(); | |
743 | dir = parent->d_inode; | |
91d5b470 | 744 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
745 | inode = dentry->d_inode; |
746 | ||
747 | if (!inode) { | |
748 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
749 | goto out_bad; | |
750 | goto out_valid; | |
751 | } | |
752 | ||
753 | if (is_bad_inode(inode)) { | |
1e7cb3dc CL |
754 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
755 | __FUNCTION__, dentry->d_parent->d_name.name, | |
756 | dentry->d_name.name); | |
1da177e4 LT |
757 | goto out_bad; |
758 | } | |
759 | ||
760 | /* Revalidate parent directory attribute cache */ | |
761 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
762 | goto out_zap_parent; | |
763 | ||
764 | /* Force a full look up iff the parent directory has changed */ | |
765 | if (nfs_check_verifier(dir, dentry)) { | |
766 | if (nfs_lookup_verify_inode(inode, nd)) | |
767 | goto out_zap_parent; | |
768 | goto out_valid; | |
769 | } | |
770 | ||
771 | if (NFS_STALE(inode)) | |
772 | goto out_bad; | |
773 | ||
774 | verifier = nfs_save_change_attribute(dir); | |
775 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); | |
776 | if (error) | |
777 | goto out_bad; | |
778 | if (nfs_compare_fh(NFS_FH(inode), &fhandle)) | |
779 | goto out_bad; | |
780 | if ((error = nfs_refresh_inode(inode, &fattr)) != 0) | |
781 | goto out_bad; | |
782 | ||
783 | nfs_renew_times(dentry); | |
784 | nfs_set_verifier(dentry, verifier); | |
785 | out_valid: | |
786 | unlock_kernel(); | |
787 | dput(parent); | |
1e7cb3dc CL |
788 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
789 | __FUNCTION__, dentry->d_parent->d_name.name, | |
790 | dentry->d_name.name); | |
1da177e4 LT |
791 | return 1; |
792 | out_zap_parent: | |
793 | nfs_zap_caches(dir); | |
794 | out_bad: | |
795 | NFS_CACHEINV(dir); | |
796 | if (inode && S_ISDIR(inode->i_mode)) { | |
797 | /* Purge readdir caches. */ | |
798 | nfs_zap_caches(inode); | |
799 | /* If we have submounts, don't unhash ! */ | |
800 | if (have_submounts(dentry)) | |
801 | goto out_valid; | |
802 | shrink_dcache_parent(dentry); | |
803 | } | |
804 | d_drop(dentry); | |
805 | unlock_kernel(); | |
806 | dput(parent); | |
1e7cb3dc CL |
807 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
808 | __FUNCTION__, dentry->d_parent->d_name.name, | |
809 | dentry->d_name.name); | |
1da177e4 LT |
810 | return 0; |
811 | } | |
812 | ||
813 | /* | |
814 | * This is called from dput() when d_count is going to 0. | |
815 | */ | |
816 | static int nfs_dentry_delete(struct dentry *dentry) | |
817 | { | |
818 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
819 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
820 | dentry->d_flags); | |
821 | ||
822 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
823 | /* Unhash it, so that ->d_iput() would be called */ | |
824 | return 1; | |
825 | } | |
826 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
827 | /* Unhash it, so that ancestors of killed async unlink | |
828 | * files will be cleaned up during umount */ | |
829 | return 1; | |
830 | } | |
831 | return 0; | |
832 | ||
833 | } | |
834 | ||
835 | /* | |
836 | * Called when the dentry loses inode. | |
837 | * We use it to clean up silly-renamed files. | |
838 | */ | |
839 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
840 | { | |
cae7a073 | 841 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
842 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
843 | lock_kernel(); | |
844 | inode->i_nlink--; | |
845 | nfs_complete_unlink(dentry); | |
846 | unlock_kernel(); | |
847 | } | |
848 | /* When creating a negative dentry, we want to renew d_time */ | |
849 | nfs_renew_times(dentry); | |
850 | iput(inode); | |
851 | } | |
852 | ||
853 | struct dentry_operations nfs_dentry_operations = { | |
854 | .d_revalidate = nfs_lookup_revalidate, | |
855 | .d_delete = nfs_dentry_delete, | |
856 | .d_iput = nfs_dentry_iput, | |
857 | }; | |
858 | ||
1d6757fb TM |
859 | /* |
860 | * Use intent information to check whether or not we're going to do | |
861 | * an O_EXCL create using this path component. | |
862 | */ | |
1da177e4 LT |
863 | static inline |
864 | int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
865 | { | |
866 | if (NFS_PROTO(dir)->version == 2) | |
867 | return 0; | |
1d6757fb | 868 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) |
1da177e4 LT |
869 | return 0; |
870 | return (nd->intent.open.flags & O_EXCL) != 0; | |
871 | } | |
872 | ||
55a97593 TM |
873 | static inline int nfs_reval_fsid(struct inode *dir, |
874 | struct nfs_fh *fh, struct nfs_fattr *fattr) | |
875 | { | |
876 | struct nfs_server *server = NFS_SERVER(dir); | |
877 | ||
878 | if (!nfs_fsid_equal(&server->fsid, &fattr->fsid)) | |
879 | /* Revalidate fsid on root dir */ | |
880 | return __nfs_revalidate_inode(server, dir->i_sb->s_root->d_inode); | |
881 | return 0; | |
882 | } | |
883 | ||
1da177e4 LT |
884 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
885 | { | |
886 | struct dentry *res; | |
887 | struct inode *inode = NULL; | |
888 | int error; | |
889 | struct nfs_fh fhandle; | |
890 | struct nfs_fattr fattr; | |
891 | ||
892 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
893 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 894 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
895 | |
896 | res = ERR_PTR(-ENAMETOOLONG); | |
897 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
898 | goto out; | |
899 | ||
900 | res = ERR_PTR(-ENOMEM); | |
901 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
902 | ||
903 | lock_kernel(); | |
1da177e4 LT |
904 | |
905 | /* If we're doing an exclusive create, optimize away the lookup */ | |
906 | if (nfs_is_exclusive_create(dir, nd)) | |
907 | goto no_entry; | |
908 | ||
909 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); | |
910 | if (error == -ENOENT) | |
911 | goto no_entry; | |
912 | if (error < 0) { | |
913 | res = ERR_PTR(error); | |
914 | goto out_unlock; | |
915 | } | |
55a97593 TM |
916 | error = nfs_reval_fsid(dir, &fhandle, &fattr); |
917 | if (error < 0) { | |
918 | res = ERR_PTR(error); | |
919 | goto out_unlock; | |
920 | } | |
1da177e4 | 921 | inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr); |
03f28e3a TM |
922 | res = (struct dentry *)inode; |
923 | if (IS_ERR(res)) | |
1da177e4 LT |
924 | goto out_unlock; |
925 | no_entry: | |
926 | res = d_add_unique(dentry, inode); | |
927 | if (res != NULL) | |
928 | dentry = res; | |
929 | nfs_renew_times(dentry); | |
930 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
931 | out_unlock: | |
932 | unlock_kernel(); | |
933 | out: | |
934 | return res; | |
935 | } | |
936 | ||
937 | #ifdef CONFIG_NFS_V4 | |
938 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
939 | ||
940 | struct dentry_operations nfs4_dentry_operations = { | |
941 | .d_revalidate = nfs_open_revalidate, | |
942 | .d_delete = nfs_dentry_delete, | |
943 | .d_iput = nfs_dentry_iput, | |
944 | }; | |
945 | ||
1d6757fb TM |
946 | /* |
947 | * Use intent information to determine whether we need to substitute | |
948 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
949 | */ | |
1da177e4 LT |
950 | static int is_atomic_open(struct inode *dir, struct nameidata *nd) |
951 | { | |
1d6757fb | 952 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
953 | return 0; |
954 | /* NFS does not (yet) have a stateful open for directories */ | |
955 | if (nd->flags & LOOKUP_DIRECTORY) | |
956 | return 0; | |
957 | /* Are we trying to write to a read only partition? */ | |
958 | if (IS_RDONLY(dir) && (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
959 | return 0; | |
960 | return 1; | |
961 | } | |
962 | ||
963 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
964 | { | |
965 | struct dentry *res = NULL; | |
1da177e4 LT |
966 | int error; |
967 | ||
1e7cb3dc CL |
968 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
969 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
970 | ||
1da177e4 LT |
971 | /* Check that we are indeed trying to open this file */ |
972 | if (!is_atomic_open(dir, nd)) | |
973 | goto no_open; | |
974 | ||
975 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
976 | res = ERR_PTR(-ENAMETOOLONG); | |
977 | goto out; | |
978 | } | |
979 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
980 | ||
981 | /* Let vfs_create() deal with O_EXCL */ | |
02a913a7 TM |
982 | if (nd->intent.open.flags & O_EXCL) { |
983 | d_add(dentry, NULL); | |
984 | goto out; | |
985 | } | |
1da177e4 LT |
986 | |
987 | /* Open the file on the server */ | |
988 | lock_kernel(); | |
989 | /* Revalidate parent directory attribute cache */ | |
990 | error = nfs_revalidate_inode(NFS_SERVER(dir), dir); | |
991 | if (error < 0) { | |
992 | res = ERR_PTR(error); | |
01c314a0 | 993 | unlock_kernel(); |
1da177e4 LT |
994 | goto out; |
995 | } | |
996 | ||
997 | if (nd->intent.open.flags & O_CREAT) { | |
998 | nfs_begin_data_update(dir); | |
02a913a7 | 999 | res = nfs4_atomic_open(dir, dentry, nd); |
1da177e4 LT |
1000 | nfs_end_data_update(dir); |
1001 | } else | |
02a913a7 | 1002 | res = nfs4_atomic_open(dir, dentry, nd); |
1da177e4 | 1003 | unlock_kernel(); |
02a913a7 TM |
1004 | if (IS_ERR(res)) { |
1005 | error = PTR_ERR(res); | |
1da177e4 LT |
1006 | switch (error) { |
1007 | /* Make a negative dentry */ | |
1008 | case -ENOENT: | |
02a913a7 TM |
1009 | res = NULL; |
1010 | goto out; | |
1da177e4 | 1011 | /* This turned out not to be a regular file */ |
6f926b5b TM |
1012 | case -EISDIR: |
1013 | case -ENOTDIR: | |
1014 | goto no_open; | |
1da177e4 LT |
1015 | case -ELOOP: |
1016 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1017 | goto no_open; | |
1da177e4 LT |
1018 | /* case -EINVAL: */ |
1019 | default: | |
1da177e4 LT |
1020 | goto out; |
1021 | } | |
02a913a7 | 1022 | } else if (res != NULL) |
1da177e4 LT |
1023 | dentry = res; |
1024 | nfs_renew_times(dentry); | |
1025 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1026 | out: | |
1027 | return res; | |
1028 | no_open: | |
1029 | return nfs_lookup(dir, dentry, nd); | |
1030 | } | |
1031 | ||
1032 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1033 | { | |
1034 | struct dentry *parent = NULL; | |
1035 | struct inode *inode = dentry->d_inode; | |
1036 | struct inode *dir; | |
1037 | unsigned long verifier; | |
1038 | int openflags, ret = 0; | |
1039 | ||
1040 | parent = dget_parent(dentry); | |
1041 | dir = parent->d_inode; | |
1042 | if (!is_atomic_open(dir, nd)) | |
1043 | goto no_open; | |
1044 | /* We can't create new files in nfs_open_revalidate(), so we | |
1045 | * optimize away revalidation of negative dentries. | |
1046 | */ | |
1047 | if (inode == NULL) | |
1048 | goto out; | |
1049 | /* NFS only supports OPEN on regular files */ | |
1050 | if (!S_ISREG(inode->i_mode)) | |
1051 | goto no_open; | |
1052 | openflags = nd->intent.open.flags; | |
1053 | /* We cannot do exclusive creation on a positive dentry */ | |
1054 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
1055 | goto no_open; | |
1056 | /* We can't create new files, or truncate existing ones here */ | |
1057 | openflags &= ~(O_CREAT|O_TRUNC); | |
1058 | ||
1059 | /* | |
1b1dcc1b | 1060 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1061 | * operations that change the directory. We therefore save the |
1062 | * change attribute *before* we do the RPC call. | |
1063 | */ | |
1064 | lock_kernel(); | |
1065 | verifier = nfs_save_change_attribute(dir); | |
02a913a7 | 1066 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
1da177e4 LT |
1067 | if (!ret) |
1068 | nfs_set_verifier(dentry, verifier); | |
1069 | unlock_kernel(); | |
1070 | out: | |
1071 | dput(parent); | |
1072 | if (!ret) | |
1073 | d_drop(dentry); | |
1074 | return ret; | |
1075 | no_open: | |
1076 | dput(parent); | |
1077 | if (inode != NULL && nfs_have_delegation(inode, FMODE_READ)) | |
1078 | return 1; | |
1079 | return nfs_lookup_revalidate(dentry, nd); | |
1080 | } | |
1081 | #endif /* CONFIG_NFSV4 */ | |
1082 | ||
1083 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) | |
1084 | { | |
1085 | struct dentry *parent = desc->file->f_dentry; | |
1086 | struct inode *dir = parent->d_inode; | |
1087 | struct nfs_entry *entry = desc->entry; | |
1088 | struct dentry *dentry, *alias; | |
1089 | struct qstr name = { | |
1090 | .name = entry->name, | |
1091 | .len = entry->len, | |
1092 | }; | |
1093 | struct inode *inode; | |
1094 | ||
1095 | switch (name.len) { | |
1096 | case 2: | |
1097 | if (name.name[0] == '.' && name.name[1] == '.') | |
1098 | return dget_parent(parent); | |
1099 | break; | |
1100 | case 1: | |
1101 | if (name.name[0] == '.') | |
1102 | return dget(parent); | |
1103 | } | |
1104 | name.hash = full_name_hash(name.name, name.len); | |
1105 | dentry = d_lookup(parent, &name); | |
1106 | if (dentry != NULL) | |
1107 | return dentry; | |
1108 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) | |
1109 | return NULL; | |
1b1dcc1b | 1110 | /* Note: caller is already holding the dir->i_mutex! */ |
1da177e4 LT |
1111 | dentry = d_alloc(parent, &name); |
1112 | if (dentry == NULL) | |
1113 | return NULL; | |
1114 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1115 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
03f28e3a | 1116 | if (IS_ERR(inode)) { |
1da177e4 LT |
1117 | dput(dentry); |
1118 | return NULL; | |
1119 | } | |
1120 | alias = d_add_unique(dentry, inode); | |
1121 | if (alias != NULL) { | |
1122 | dput(dentry); | |
1123 | dentry = alias; | |
1124 | } | |
1125 | nfs_renew_times(dentry); | |
1126 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1127 | return dentry; | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Code common to create, mkdir, and mknod. | |
1132 | */ | |
1133 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1134 | struct nfs_fattr *fattr) | |
1135 | { | |
1136 | struct inode *inode; | |
1137 | int error = -EACCES; | |
1138 | ||
1139 | /* We may have been initialized further down */ | |
1140 | if (dentry->d_inode) | |
1141 | return 0; | |
1142 | if (fhandle->size == 0) { | |
1143 | struct inode *dir = dentry->d_parent->d_inode; | |
1144 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1145 | if (error) | |
1146 | goto out_err; | |
1147 | } | |
1148 | if (!(fattr->valid & NFS_ATTR_FATTR)) { | |
1149 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1150 | error = server->rpc_ops->getattr(server, fhandle, fattr); | |
1151 | if (error < 0) | |
1152 | goto out_err; | |
1153 | } | |
1da177e4 | 1154 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1155 | error = PTR_ERR(inode); |
1156 | if (IS_ERR(inode)) | |
1da177e4 LT |
1157 | goto out_err; |
1158 | d_instantiate(dentry, inode); | |
1159 | return 0; | |
1160 | out_err: | |
1161 | d_drop(dentry); | |
1162 | return error; | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Following a failed create operation, we drop the dentry rather | |
1167 | * than retain a negative dentry. This avoids a problem in the event | |
1168 | * that the operation succeeded on the server, but an error in the | |
1169 | * reply path made it appear to have failed. | |
1170 | */ | |
1171 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1172 | struct nameidata *nd) | |
1173 | { | |
1174 | struct iattr attr; | |
1175 | int error; | |
1176 | int open_flags = 0; | |
1177 | ||
1e7cb3dc CL |
1178 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1179 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1180 | |
1181 | attr.ia_mode = mode; | |
1182 | attr.ia_valid = ATTR_MODE; | |
1183 | ||
1184 | if (nd && (nd->flags & LOOKUP_CREATE)) | |
1185 | open_flags = nd->intent.open.flags; | |
1186 | ||
1187 | lock_kernel(); | |
1188 | nfs_begin_data_update(dir); | |
02a913a7 | 1189 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
1da177e4 LT |
1190 | nfs_end_data_update(dir); |
1191 | if (error != 0) | |
1192 | goto out_err; | |
1193 | nfs_renew_times(dentry); | |
1194 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1195 | unlock_kernel(); | |
1196 | return 0; | |
1197 | out_err: | |
1198 | unlock_kernel(); | |
1199 | d_drop(dentry); | |
1200 | return error; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * See comments for nfs_proc_create regarding failed operations. | |
1205 | */ | |
1206 | static int | |
1207 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1208 | { | |
1209 | struct iattr attr; | |
1210 | int status; | |
1211 | ||
1e7cb3dc CL |
1212 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1213 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1214 | |
1215 | if (!new_valid_dev(rdev)) | |
1216 | return -EINVAL; | |
1217 | ||
1218 | attr.ia_mode = mode; | |
1219 | attr.ia_valid = ATTR_MODE; | |
1220 | ||
1221 | lock_kernel(); | |
1222 | nfs_begin_data_update(dir); | |
1223 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); | |
1224 | nfs_end_data_update(dir); | |
1225 | if (status != 0) | |
1226 | goto out_err; | |
1227 | nfs_renew_times(dentry); | |
1228 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1229 | unlock_kernel(); | |
1230 | return 0; | |
1231 | out_err: | |
1232 | unlock_kernel(); | |
1233 | d_drop(dentry); | |
1234 | return status; | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * See comments for nfs_proc_create regarding failed operations. | |
1239 | */ | |
1240 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1241 | { | |
1242 | struct iattr attr; | |
1243 | int error; | |
1244 | ||
1e7cb3dc CL |
1245 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1246 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1247 | |
1248 | attr.ia_valid = ATTR_MODE; | |
1249 | attr.ia_mode = mode | S_IFDIR; | |
1250 | ||
1251 | lock_kernel(); | |
1252 | nfs_begin_data_update(dir); | |
1253 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); | |
1254 | nfs_end_data_update(dir); | |
1255 | if (error != 0) | |
1256 | goto out_err; | |
1257 | nfs_renew_times(dentry); | |
1258 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1259 | unlock_kernel(); | |
1260 | return 0; | |
1261 | out_err: | |
1262 | d_drop(dentry); | |
1263 | unlock_kernel(); | |
1264 | return error; | |
1265 | } | |
1266 | ||
1267 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) | |
1268 | { | |
1269 | int error; | |
1270 | ||
1e7cb3dc CL |
1271 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1272 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1273 | |
1274 | lock_kernel(); | |
1275 | nfs_begin_data_update(dir); | |
1276 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1277 | /* Ensure the VFS deletes this inode */ | |
1278 | if (error == 0 && dentry->d_inode != NULL) | |
1279 | dentry->d_inode->i_nlink = 0; | |
1280 | nfs_end_data_update(dir); | |
1281 | unlock_kernel(); | |
1282 | ||
1283 | return error; | |
1284 | } | |
1285 | ||
1286 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) | |
1287 | { | |
1288 | static unsigned int sillycounter; | |
1289 | const int i_inosize = sizeof(dir->i_ino)*2; | |
1290 | const int countersize = sizeof(sillycounter)*2; | |
1291 | const int slen = sizeof(".nfs") + i_inosize + countersize - 1; | |
1292 | char silly[slen+1]; | |
1293 | struct qstr qsilly; | |
1294 | struct dentry *sdentry; | |
1295 | int error = -EIO; | |
1296 | ||
1297 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", | |
1298 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1299 | atomic_read(&dentry->d_count)); | |
91d5b470 | 1300 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
1da177e4 LT |
1301 | |
1302 | #ifdef NFS_PARANOIA | |
1303 | if (!dentry->d_inode) | |
1304 | printk("NFS: silly-renaming %s/%s, negative dentry??\n", | |
1305 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1306 | #endif | |
1307 | /* | |
1308 | * We don't allow a dentry to be silly-renamed twice. | |
1309 | */ | |
1310 | error = -EBUSY; | |
1311 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1312 | goto out; | |
1313 | ||
1314 | sprintf(silly, ".nfs%*.*lx", | |
1315 | i_inosize, i_inosize, dentry->d_inode->i_ino); | |
1316 | ||
34ea8188 TM |
1317 | /* Return delegation in anticipation of the rename */ |
1318 | nfs_inode_return_delegation(dentry->d_inode); | |
1319 | ||
1da177e4 LT |
1320 | sdentry = NULL; |
1321 | do { | |
1322 | char *suffix = silly + slen - countersize; | |
1323 | ||
1324 | dput(sdentry); | |
1325 | sillycounter++; | |
1326 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); | |
1327 | ||
1e7cb3dc CL |
1328 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
1329 | dentry->d_name.name, silly); | |
1da177e4 LT |
1330 | |
1331 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); | |
1332 | /* | |
1333 | * N.B. Better to return EBUSY here ... it could be | |
1334 | * dangerous to delete the file while it's in use. | |
1335 | */ | |
1336 | if (IS_ERR(sdentry)) | |
1337 | goto out; | |
1338 | } while(sdentry->d_inode != NULL); /* need negative lookup */ | |
1339 | ||
1340 | qsilly.name = silly; | |
1341 | qsilly.len = strlen(silly); | |
1342 | nfs_begin_data_update(dir); | |
1343 | if (dentry->d_inode) { | |
1344 | nfs_begin_data_update(dentry->d_inode); | |
1345 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, | |
1346 | dir, &qsilly); | |
5ba7cc48 | 1347 | nfs_mark_for_revalidate(dentry->d_inode); |
1da177e4 LT |
1348 | nfs_end_data_update(dentry->d_inode); |
1349 | } else | |
1350 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, | |
1351 | dir, &qsilly); | |
1352 | nfs_end_data_update(dir); | |
1353 | if (!error) { | |
1354 | nfs_renew_times(dentry); | |
1355 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1356 | d_move(dentry, sdentry); | |
1357 | error = nfs_async_unlink(dentry); | |
1358 | /* If we return 0 we don't unlink */ | |
1359 | } | |
1360 | dput(sdentry); | |
1361 | out: | |
1362 | return error; | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * Remove a file after making sure there are no pending writes, | |
1367 | * and after checking that the file has only one user. | |
1368 | * | |
1369 | * We invalidate the attribute cache and free the inode prior to the operation | |
1370 | * to avoid possible races if the server reuses the inode. | |
1371 | */ | |
1372 | static int nfs_safe_remove(struct dentry *dentry) | |
1373 | { | |
1374 | struct inode *dir = dentry->d_parent->d_inode; | |
1375 | struct inode *inode = dentry->d_inode; | |
1376 | int error = -EBUSY; | |
1377 | ||
1378 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1379 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1380 | ||
1381 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1382 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1383 | error = 0; | |
1384 | goto out; | |
1385 | } | |
1386 | ||
1387 | nfs_begin_data_update(dir); | |
1388 | if (inode != NULL) { | |
cae7a073 | 1389 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1390 | nfs_begin_data_update(inode); |
1391 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
1392 | /* The VFS may want to delete this inode */ | |
1393 | if (error == 0) | |
1394 | inode->i_nlink--; | |
5ba7cc48 | 1395 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1396 | nfs_end_data_update(inode); |
1397 | } else | |
1398 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
1399 | nfs_end_data_update(dir); | |
1400 | out: | |
1401 | return error; | |
1402 | } | |
1403 | ||
1404 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1405 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1406 | * | |
1407 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1408 | */ | |
1409 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1410 | { | |
1411 | int error; | |
1412 | int need_rehash = 0; | |
1413 | ||
1414 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1415 | dir->i_ino, dentry->d_name.name); | |
1416 | ||
1417 | lock_kernel(); | |
1418 | spin_lock(&dcache_lock); | |
1419 | spin_lock(&dentry->d_lock); | |
1420 | if (atomic_read(&dentry->d_count) > 1) { | |
1421 | spin_unlock(&dentry->d_lock); | |
1422 | spin_unlock(&dcache_lock); | |
1423 | error = nfs_sillyrename(dir, dentry); | |
1424 | unlock_kernel(); | |
1425 | return error; | |
1426 | } | |
1427 | if (!d_unhashed(dentry)) { | |
1428 | __d_drop(dentry); | |
1429 | need_rehash = 1; | |
1430 | } | |
1431 | spin_unlock(&dentry->d_lock); | |
1432 | spin_unlock(&dcache_lock); | |
1433 | error = nfs_safe_remove(dentry); | |
1434 | if (!error) { | |
1435 | nfs_renew_times(dentry); | |
1436 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1437 | } else if (need_rehash) | |
1438 | d_rehash(dentry); | |
1439 | unlock_kernel(); | |
1440 | return error; | |
1441 | } | |
1442 | ||
1443 | static int | |
1444 | nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1445 | { | |
1446 | struct iattr attr; | |
1447 | struct nfs_fattr sym_attr; | |
1448 | struct nfs_fh sym_fh; | |
1449 | struct qstr qsymname; | |
1450 | int error; | |
1451 | ||
1452 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1453 | dir->i_ino, dentry->d_name.name, symname); | |
1454 | ||
1455 | #ifdef NFS_PARANOIA | |
1456 | if (dentry->d_inode) | |
1457 | printk("nfs_proc_symlink: %s/%s not negative!\n", | |
1458 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1459 | #endif | |
1460 | /* | |
1461 | * Fill in the sattr for the call. | |
1462 | * Note: SunOS 4.1.2 crashes if the mode isn't initialized! | |
1463 | */ | |
1464 | attr.ia_valid = ATTR_MODE; | |
1465 | attr.ia_mode = S_IFLNK | S_IRWXUGO; | |
1466 | ||
1467 | qsymname.name = symname; | |
1468 | qsymname.len = strlen(symname); | |
1469 | ||
1470 | lock_kernel(); | |
1471 | nfs_begin_data_update(dir); | |
1472 | error = NFS_PROTO(dir)->symlink(dir, &dentry->d_name, &qsymname, | |
1473 | &attr, &sym_fh, &sym_attr); | |
1474 | nfs_end_data_update(dir); | |
1475 | if (!error) { | |
1476 | error = nfs_instantiate(dentry, &sym_fh, &sym_attr); | |
1477 | } else { | |
1478 | if (error == -EEXIST) | |
1479 | printk("nfs_proc_symlink: %s/%s already exists??\n", | |
1480 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1481 | d_drop(dentry); | |
1482 | } | |
1483 | unlock_kernel(); | |
1484 | return error; | |
1485 | } | |
1486 | ||
1487 | static int | |
1488 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1489 | { | |
1490 | struct inode *inode = old_dentry->d_inode; | |
1491 | int error; | |
1492 | ||
1493 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1494 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1495 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1496 | ||
1da177e4 | 1497 | lock_kernel(); |
1da177e4 LT |
1498 | nfs_begin_data_update(dir); |
1499 | nfs_begin_data_update(inode); | |
1500 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); | |
cf809556 TM |
1501 | if (error == 0) { |
1502 | atomic_inc(&inode->i_count); | |
1503 | d_instantiate(dentry, inode); | |
1504 | } | |
1da177e4 LT |
1505 | nfs_end_data_update(inode); |
1506 | nfs_end_data_update(dir); | |
1507 | unlock_kernel(); | |
1508 | return error; | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * RENAME | |
1513 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1514 | * different file handle for the same inode after a rename (e.g. when | |
1515 | * moving to a different directory). A fail-safe method to do so would | |
1516 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1517 | * rename the old file using the sillyrename stuff. This way, the original | |
1518 | * file in old_dir will go away when the last process iput()s the inode. | |
1519 | * | |
1520 | * FIXED. | |
1521 | * | |
1522 | * It actually works quite well. One needs to have the possibility for | |
1523 | * at least one ".nfs..." file in each directory the file ever gets | |
1524 | * moved or linked to which happens automagically with the new | |
1525 | * implementation that only depends on the dcache stuff instead of | |
1526 | * using the inode layer | |
1527 | * | |
1528 | * Unfortunately, things are a little more complicated than indicated | |
1529 | * above. For a cross-directory move, we want to make sure we can get | |
1530 | * rid of the old inode after the operation. This means there must be | |
1531 | * no pending writes (if it's a file), and the use count must be 1. | |
1532 | * If these conditions are met, we can drop the dentries before doing | |
1533 | * the rename. | |
1534 | */ | |
1535 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1536 | struct inode *new_dir, struct dentry *new_dentry) | |
1537 | { | |
1538 | struct inode *old_inode = old_dentry->d_inode; | |
1539 | struct inode *new_inode = new_dentry->d_inode; | |
1540 | struct dentry *dentry = NULL, *rehash = NULL; | |
1541 | int error = -EBUSY; | |
1542 | ||
1543 | /* | |
1544 | * To prevent any new references to the target during the rename, | |
1545 | * we unhash the dentry and free the inode in advance. | |
1546 | */ | |
1547 | lock_kernel(); | |
1548 | if (!d_unhashed(new_dentry)) { | |
1549 | d_drop(new_dentry); | |
1550 | rehash = new_dentry; | |
1551 | } | |
1552 | ||
1553 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", | |
1554 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1555 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1556 | atomic_read(&new_dentry->d_count)); | |
1557 | ||
1558 | /* | |
1559 | * First check whether the target is busy ... we can't | |
1560 | * safely do _any_ rename if the target is in use. | |
1561 | * | |
1562 | * For files, make a copy of the dentry and then do a | |
1563 | * silly-rename. If the silly-rename succeeds, the | |
1564 | * copied dentry is hashed and becomes the new target. | |
1565 | */ | |
1566 | if (!new_inode) | |
1567 | goto go_ahead; | |
6fe43f9e TM |
1568 | if (S_ISDIR(new_inode->i_mode)) { |
1569 | error = -EISDIR; | |
1570 | if (!S_ISDIR(old_inode->i_mode)) | |
1571 | goto out; | |
1572 | } else if (atomic_read(&new_dentry->d_count) > 2) { | |
1da177e4 LT |
1573 | int err; |
1574 | /* copy the target dentry's name */ | |
1575 | dentry = d_alloc(new_dentry->d_parent, | |
1576 | &new_dentry->d_name); | |
1577 | if (!dentry) | |
1578 | goto out; | |
1579 | ||
1580 | /* silly-rename the existing target ... */ | |
1581 | err = nfs_sillyrename(new_dir, new_dentry); | |
1582 | if (!err) { | |
1583 | new_dentry = rehash = dentry; | |
1584 | new_inode = NULL; | |
1585 | /* instantiate the replacement target */ | |
1586 | d_instantiate(new_dentry, NULL); | |
1587 | } else if (atomic_read(&new_dentry->d_count) > 1) { | |
1588 | /* dentry still busy? */ | |
1589 | #ifdef NFS_PARANOIA | |
1590 | printk("nfs_rename: target %s/%s busy, d_count=%d\n", | |
1591 | new_dentry->d_parent->d_name.name, | |
1592 | new_dentry->d_name.name, | |
1593 | atomic_read(&new_dentry->d_count)); | |
1594 | #endif | |
1595 | goto out; | |
1596 | } | |
20509f1b TM |
1597 | } else |
1598 | new_inode->i_nlink--; | |
1da177e4 LT |
1599 | |
1600 | go_ahead: | |
1601 | /* | |
1602 | * ... prune child dentries and writebacks if needed. | |
1603 | */ | |
1604 | if (atomic_read(&old_dentry->d_count) > 1) { | |
1605 | nfs_wb_all(old_inode); | |
1606 | shrink_dcache_parent(old_dentry); | |
1607 | } | |
cae7a073 | 1608 | nfs_inode_return_delegation(old_inode); |
1da177e4 | 1609 | |
24174119 TM |
1610 | if (new_inode != NULL) { |
1611 | nfs_inode_return_delegation(new_inode); | |
1da177e4 | 1612 | d_delete(new_dentry); |
24174119 | 1613 | } |
1da177e4 LT |
1614 | |
1615 | nfs_begin_data_update(old_dir); | |
1616 | nfs_begin_data_update(new_dir); | |
1617 | nfs_begin_data_update(old_inode); | |
1618 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, | |
1619 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1620 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1621 | nfs_end_data_update(old_inode); |
1622 | nfs_end_data_update(new_dir); | |
1623 | nfs_end_data_update(old_dir); | |
1624 | out: | |
1625 | if (rehash) | |
1626 | d_rehash(rehash); | |
1627 | if (!error) { | |
1628 | if (!S_ISDIR(old_inode->i_mode)) | |
1629 | d_move(old_dentry, new_dentry); | |
1630 | nfs_renew_times(new_dentry); | |
1631 | nfs_set_verifier(new_dentry, nfs_save_change_attribute(new_dir)); | |
1632 | } | |
1633 | ||
1634 | /* new dentry created? */ | |
1635 | if (dentry) | |
1636 | dput(dentry); | |
1637 | unlock_kernel(); | |
1638 | return error; | |
1639 | } | |
1640 | ||
1c3c07e9 TM |
1641 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1642 | { | |
1643 | put_rpccred(entry->cred); | |
1644 | kfree(entry); | |
1645 | } | |
1646 | ||
1647 | static void __nfs_access_zap_cache(struct inode *inode) | |
1da177e4 | 1648 | { |
55296809 | 1649 | struct nfs_inode *nfsi = NFS_I(inode); |
1c3c07e9 TM |
1650 | struct rb_root *root_node = &nfsi->access_cache; |
1651 | struct rb_node *n, *dispose = NULL; | |
1652 | struct nfs_access_entry *entry; | |
1653 | ||
1654 | /* Unhook entries from the cache */ | |
1655 | while ((n = rb_first(root_node)) != NULL) { | |
1656 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1657 | rb_erase(n, root_node); | |
1658 | n->rb_left = dispose; | |
1659 | dispose = n; | |
1660 | } | |
1661 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1662 | spin_unlock(&inode->i_lock); | |
1da177e4 | 1663 | |
1c3c07e9 TM |
1664 | /* Now kill them all! */ |
1665 | while (dispose != NULL) { | |
1666 | n = dispose; | |
1667 | dispose = n->rb_left; | |
1668 | nfs_access_free_entry(rb_entry(n, struct nfs_access_entry, rb_node)); | |
1669 | } | |
1da177e4 LT |
1670 | } |
1671 | ||
1c3c07e9 | 1672 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1673 | { |
1c3c07e9 TM |
1674 | spin_lock(&inode->i_lock); |
1675 | /* This will release the spinlock */ | |
1676 | __nfs_access_zap_cache(inode); | |
1677 | } | |
1da177e4 | 1678 | |
1c3c07e9 TM |
1679 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
1680 | { | |
1681 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1682 | struct nfs_access_entry *entry; | |
1683 | ||
1684 | while (n != NULL) { | |
1685 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1686 | ||
1687 | if (cred < entry->cred) | |
1688 | n = n->rb_left; | |
1689 | else if (cred > entry->cred) | |
1690 | n = n->rb_right; | |
1691 | else | |
1692 | return entry; | |
1da177e4 | 1693 | } |
1c3c07e9 TM |
1694 | return NULL; |
1695 | } | |
1696 | ||
1697 | int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) | |
1698 | { | |
1699 | struct nfs_inode *nfsi = NFS_I(inode); | |
1700 | struct nfs_access_entry *cache; | |
1701 | int err = -ENOENT; | |
1702 | ||
dc59250c | 1703 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
1704 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
1705 | goto out_zap; | |
1706 | cache = nfs_access_search_rbtree(inode, cred); | |
1707 | if (cache == NULL) | |
1708 | goto out; | |
1709 | if (time_after(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode))) | |
1710 | goto out_stale; | |
1711 | res->jiffies = cache->jiffies; | |
1712 | res->cred = cache->cred; | |
1713 | res->mask = cache->mask; | |
1714 | err = 0; | |
1715 | out: | |
1716 | spin_unlock(&inode->i_lock); | |
1717 | return err; | |
1718 | out_stale: | |
1719 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1720 | spin_unlock(&inode->i_lock); | |
1721 | nfs_access_free_entry(cache); | |
1722 | return -ENOENT; | |
1723 | out_zap: | |
1724 | /* This will release the spinlock */ | |
1725 | __nfs_access_zap_cache(inode); | |
1726 | return -ENOENT; | |
1727 | } | |
1728 | ||
1729 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
1730 | { | |
1731 | struct rb_root *root_node = &NFS_I(inode)->access_cache; | |
1732 | struct rb_node **p = &root_node->rb_node; | |
1733 | struct rb_node *parent = NULL; | |
1734 | struct nfs_access_entry *entry; | |
1735 | ||
1736 | spin_lock(&inode->i_lock); | |
1737 | while (*p != NULL) { | |
1738 | parent = *p; | |
1739 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
1740 | ||
1741 | if (set->cred < entry->cred) | |
1742 | p = &parent->rb_left; | |
1743 | else if (set->cred > entry->cred) | |
1744 | p = &parent->rb_right; | |
1745 | else | |
1746 | goto found; | |
1747 | } | |
1748 | rb_link_node(&set->rb_node, parent, p); | |
1749 | rb_insert_color(&set->rb_node, root_node); | |
dc59250c | 1750 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
1751 | return; |
1752 | found: | |
1753 | rb_replace_node(parent, &set->rb_node, root_node); | |
1754 | spin_unlock(&inode->i_lock); | |
1755 | nfs_access_free_entry(entry); | |
1756 | } | |
1757 | ||
1758 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) | |
1759 | { | |
1760 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
1761 | if (cache == NULL) | |
1762 | return; | |
1763 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 1764 | cache->jiffies = set->jiffies; |
1c3c07e9 | 1765 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 1766 | cache->mask = set->mask; |
1c3c07e9 TM |
1767 | |
1768 | nfs_access_add_rbtree(inode, cache); | |
1da177e4 LT |
1769 | } |
1770 | ||
1771 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
1772 | { | |
1773 | struct nfs_access_entry cache; | |
1774 | int status; | |
1775 | ||
1776 | status = nfs_access_get_cached(inode, cred, &cache); | |
1777 | if (status == 0) | |
1778 | goto out; | |
1779 | ||
1780 | /* Be clever: ask server to check for all possible rights */ | |
1781 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
1782 | cache.cred = cred; | |
1783 | cache.jiffies = jiffies; | |
1784 | status = NFS_PROTO(inode)->access(inode, &cache); | |
1785 | if (status != 0) | |
1786 | return status; | |
1787 | nfs_access_add_cache(inode, &cache); | |
1788 | out: | |
1789 | if ((cache.mask & mask) == mask) | |
1790 | return 0; | |
1791 | return -EACCES; | |
1792 | } | |
1793 | ||
1794 | int nfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
1795 | { | |
1796 | struct rpc_cred *cred; | |
1797 | int res = 0; | |
1798 | ||
91d5b470 CL |
1799 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
1800 | ||
1da177e4 LT |
1801 | if (mask == 0) |
1802 | goto out; | |
1803 | /* Is this sys_access() ? */ | |
1804 | if (nd != NULL && (nd->flags & LOOKUP_ACCESS)) | |
1805 | goto force_lookup; | |
1806 | ||
1807 | switch (inode->i_mode & S_IFMT) { | |
1808 | case S_IFLNK: | |
1809 | goto out; | |
1810 | case S_IFREG: | |
1811 | /* NFSv4 has atomic_open... */ | |
1812 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
1813 | && nd != NULL | |
1814 | && (nd->flags & LOOKUP_OPEN)) | |
1815 | goto out; | |
1816 | break; | |
1817 | case S_IFDIR: | |
1818 | /* | |
1819 | * Optimize away all write operations, since the server | |
1820 | * will check permissions when we perform the op. | |
1821 | */ | |
1822 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
1823 | goto out; | |
1824 | } | |
1825 | ||
1826 | force_lookup: | |
1827 | lock_kernel(); | |
1828 | ||
1829 | if (!NFS_PROTO(inode)->access) | |
1830 | goto out_notsup; | |
1831 | ||
1832 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); | |
1833 | if (!IS_ERR(cred)) { | |
1834 | res = nfs_do_access(inode, cred, mask); | |
1835 | put_rpccred(cred); | |
1836 | } else | |
1837 | res = PTR_ERR(cred); | |
1838 | unlock_kernel(); | |
1839 | out: | |
1e7cb3dc CL |
1840 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
1841 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
1842 | return res; |
1843 | out_notsup: | |
1844 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1845 | if (res == 0) | |
1846 | res = generic_permission(inode, mask, NULL); | |
1847 | unlock_kernel(); | |
1e7cb3dc | 1848 | goto out; |
1da177e4 LT |
1849 | } |
1850 | ||
1851 | /* | |
1852 | * Local variables: | |
1853 | * version-control: t | |
1854 | * kept-new-versions: 5 | |
1855 | * End: | |
1856 | */ |