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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
20 | #include <linux/time.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/stat.h> | |
23 | #include <linux/fcntl.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/sunrpc/clnt.h> | |
29 | #include <linux/nfs_fs.h> | |
30 | #include <linux/nfs_mount.h> | |
31 | #include <linux/pagemap.h> | |
873101b3 | 32 | #include <linux/pagevec.h> |
1da177e4 | 33 | #include <linux/namei.h> |
54ceac45 | 34 | #include <linux/mount.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
1da177e4 LT |
36 | |
37 | #include "delegation.h" | |
91d5b470 | 38 | #include "iostat.h" |
4c30d56e | 39 | #include "internal.h" |
cd9a1c0e | 40 | #include "fscache.h" |
1da177e4 | 41 | |
1da177e4 LT |
42 | /* #define NFS_DEBUG_VERBOSE 1 */ |
43 | ||
44 | static int nfs_opendir(struct inode *, struct file *); | |
45 | static int nfs_readdir(struct file *, void *, filldir_t); | |
46 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
47 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
48 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
49 | static int nfs_rmdir(struct inode *, struct dentry *); | |
50 | static int nfs_unlink(struct inode *, struct dentry *); | |
51 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
52 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
53 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
54 | static int nfs_rename(struct inode *, struct dentry *, | |
55 | struct inode *, struct dentry *); | |
7ea80859 | 56 | static int nfs_fsync_dir(struct file *, int); |
f0dd2136 | 57 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
d1bacf9e | 58 | static int nfs_readdir_clear_array(struct page*, gfp_t); |
1da177e4 | 59 | |
4b6f5d20 | 60 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 61 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
62 | .read = generic_read_dir, |
63 | .readdir = nfs_readdir, | |
64 | .open = nfs_opendir, | |
65 | .release = nfs_release, | |
66 | .fsync = nfs_fsync_dir, | |
67 | }; | |
68 | ||
92e1d5be | 69 | const struct inode_operations nfs_dir_inode_operations = { |
1da177e4 LT |
70 | .create = nfs_create, |
71 | .lookup = nfs_lookup, | |
72 | .link = nfs_link, | |
73 | .unlink = nfs_unlink, | |
74 | .symlink = nfs_symlink, | |
75 | .mkdir = nfs_mkdir, | |
76 | .rmdir = nfs_rmdir, | |
77 | .mknod = nfs_mknod, | |
78 | .rename = nfs_rename, | |
79 | .permission = nfs_permission, | |
80 | .getattr = nfs_getattr, | |
81 | .setattr = nfs_setattr, | |
82 | }; | |
83 | ||
d1bacf9e BS |
84 | const struct address_space_operations nfs_dir_addr_space_ops = { |
85 | .releasepage = nfs_readdir_clear_array, | |
86 | }; | |
87 | ||
b7fa0554 | 88 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 89 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
90 | .create = nfs_create, |
91 | .lookup = nfs_lookup, | |
92 | .link = nfs_link, | |
93 | .unlink = nfs_unlink, | |
94 | .symlink = nfs_symlink, | |
95 | .mkdir = nfs_mkdir, | |
96 | .rmdir = nfs_rmdir, | |
97 | .mknod = nfs_mknod, | |
98 | .rename = nfs_rename, | |
99 | .permission = nfs_permission, | |
100 | .getattr = nfs_getattr, | |
101 | .setattr = nfs_setattr, | |
102 | .listxattr = nfs3_listxattr, | |
103 | .getxattr = nfs3_getxattr, | |
104 | .setxattr = nfs3_setxattr, | |
105 | .removexattr = nfs3_removexattr, | |
106 | }; | |
107 | #endif /* CONFIG_NFS_V3 */ | |
108 | ||
1da177e4 LT |
109 | #ifdef CONFIG_NFS_V4 |
110 | ||
111 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
c0204fd2 | 112 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd); |
92e1d5be | 113 | const struct inode_operations nfs4_dir_inode_operations = { |
c0204fd2 | 114 | .create = nfs_open_create, |
1da177e4 LT |
115 | .lookup = nfs_atomic_lookup, |
116 | .link = nfs_link, | |
117 | .unlink = nfs_unlink, | |
118 | .symlink = nfs_symlink, | |
119 | .mkdir = nfs_mkdir, | |
120 | .rmdir = nfs_rmdir, | |
121 | .mknod = nfs_mknod, | |
122 | .rename = nfs_rename, | |
123 | .permission = nfs_permission, | |
124 | .getattr = nfs_getattr, | |
125 | .setattr = nfs_setattr, | |
6b3b5496 BF |
126 | .getxattr = nfs4_getxattr, |
127 | .setxattr = nfs4_setxattr, | |
128 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
129 | }; |
130 | ||
131 | #endif /* CONFIG_NFS_V4 */ | |
132 | ||
133 | /* | |
134 | * Open file | |
135 | */ | |
136 | static int | |
137 | nfs_opendir(struct inode *inode, struct file *filp) | |
138 | { | |
7451c4f0 | 139 | int res; |
1da177e4 | 140 | |
6da24bc9 | 141 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
142 | filp->f_path.dentry->d_parent->d_name.name, |
143 | filp->f_path.dentry->d_name.name); | |
144 | ||
145 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 146 | |
1da177e4 | 147 | /* Call generic open code in order to cache credentials */ |
7451c4f0 | 148 | res = nfs_open(inode, filp); |
f5a73672 NB |
149 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
150 | /* This is a mountpoint, so d_revalidate will never | |
151 | * have been called, so we need to refresh the | |
152 | * inode (for close-open consistency) ourselves. | |
153 | */ | |
154 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
155 | } | |
1da177e4 LT |
156 | return res; |
157 | } | |
158 | ||
d1bacf9e BS |
159 | struct nfs_cache_array_entry { |
160 | u64 cookie; | |
161 | u64 ino; | |
162 | struct qstr string; | |
163 | }; | |
164 | ||
165 | struct nfs_cache_array { | |
166 | unsigned int size; | |
167 | int eof_index; | |
168 | u64 last_cookie; | |
169 | struct nfs_cache_array_entry array[0]; | |
170 | }; | |
171 | ||
172 | #define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry)) | |
173 | ||
0dbb4c67 | 174 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
1da177e4 LT |
175 | typedef struct { |
176 | struct file *file; | |
177 | struct page *page; | |
178 | unsigned long page_index; | |
f0dd2136 TM |
179 | u64 *dir_cookie; |
180 | loff_t current_index; | |
1da177e4 | 181 | decode_dirent_t decode; |
d1bacf9e | 182 | |
1f4eab7e | 183 | unsigned long timestamp; |
4704f0e2 | 184 | unsigned long gencount; |
d1bacf9e BS |
185 | unsigned int cache_entry_index; |
186 | unsigned int plus:1; | |
187 | unsigned int eof:1; | |
1da177e4 LT |
188 | } nfs_readdir_descriptor_t; |
189 | ||
d1bacf9e BS |
190 | /* |
191 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
192 | */ |
193 | static | |
d1bacf9e BS |
194 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
195 | { | |
196 | if (page == NULL) | |
197 | return ERR_PTR(-EIO); | |
198 | return (struct nfs_cache_array *)kmap(page); | |
199 | } | |
200 | ||
201 | static | |
202 | void nfs_readdir_release_array(struct page *page) | |
203 | { | |
204 | kunmap(page); | |
205 | } | |
206 | ||
207 | /* | |
208 | * we are freeing strings created by nfs_add_to_readdir_array() | |
209 | */ | |
210 | static | |
211 | int nfs_readdir_clear_array(struct page *page, gfp_t mask) | |
212 | { | |
213 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
214 | int i; | |
215 | for (i = 0; i < array->size; i++) | |
216 | kfree(array->array[i].string.name); | |
217 | nfs_readdir_release_array(page); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
222 | * the caller is responsible for freeing qstr.name | |
223 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
224 | * nfs_clear_readdir_array() | |
225 | */ | |
226 | static | |
227 | void nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) | |
228 | { | |
229 | string->len = len; | |
230 | string->name = kmemdup(name, len, GFP_KERNEL); | |
231 | string->hash = full_name_hash(string->name, string->len); | |
232 | } | |
233 | ||
234 | static | |
235 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
236 | { | |
237 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
238 | if (IS_ERR(array)) | |
239 | return PTR_ERR(array); | |
240 | if (array->size >= MAX_READDIR_ARRAY) { | |
241 | nfs_readdir_release_array(page); | |
242 | return -EIO; | |
243 | } | |
244 | ||
245 | array->array[array->size].cookie = entry->prev_cookie; | |
246 | array->last_cookie = entry->cookie; | |
247 | array->array[array->size].ino = entry->ino; | |
248 | nfs_readdir_make_qstr(&array->array[array->size].string, entry->name, entry->len); | |
249 | if (entry->eof == 1) | |
250 | array->eof_index = array->size; | |
251 | array->size++; | |
252 | nfs_readdir_release_array(page); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static | |
257 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
258 | { | |
259 | loff_t diff = desc->file->f_pos - desc->current_index; | |
260 | unsigned int index; | |
261 | ||
262 | if (diff < 0) | |
263 | goto out_eof; | |
264 | if (diff >= array->size) { | |
265 | if (array->eof_index > 0) | |
266 | goto out_eof; | |
267 | desc->current_index += array->size; | |
268 | return -EAGAIN; | |
269 | } | |
270 | ||
271 | index = (unsigned int)diff; | |
272 | *desc->dir_cookie = array->array[index].cookie; | |
273 | desc->cache_entry_index = index; | |
274 | if (index == array->eof_index) | |
275 | desc->eof = 1; | |
276 | return 0; | |
277 | out_eof: | |
278 | desc->eof = 1; | |
279 | return -EBADCOOKIE; | |
280 | } | |
281 | ||
282 | static | |
283 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
284 | { | |
285 | int i; | |
286 | int status = -EAGAIN; | |
287 | ||
288 | for (i = 0; i < array->size; i++) { | |
289 | if (i == array->eof_index) { | |
290 | desc->eof = 1; | |
291 | status = -EBADCOOKIE; | |
292 | } | |
293 | if (array->array[i].cookie == *desc->dir_cookie) { | |
294 | desc->cache_entry_index = i; | |
295 | status = 0; | |
296 | break; | |
297 | } | |
298 | } | |
299 | ||
300 | return status; | |
301 | } | |
302 | ||
303 | static | |
304 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
305 | { | |
306 | struct nfs_cache_array *array; | |
307 | int status = -EBADCOOKIE; | |
308 | ||
309 | if (desc->dir_cookie == NULL) | |
310 | goto out; | |
311 | ||
312 | array = nfs_readdir_get_array(desc->page); | |
313 | if (IS_ERR(array)) { | |
314 | status = PTR_ERR(array); | |
315 | goto out; | |
316 | } | |
317 | ||
318 | if (*desc->dir_cookie == 0) | |
319 | status = nfs_readdir_search_for_pos(array, desc); | |
320 | else | |
321 | status = nfs_readdir_search_for_cookie(array, desc); | |
322 | ||
323 | nfs_readdir_release_array(desc->page); | |
324 | out: | |
325 | return status; | |
326 | } | |
327 | ||
328 | /* Fill a page with xdr information before transferring to the cache page */ | |
329 | static | |
330 | int nfs_readdir_xdr_filler(struct page *xdr_page, nfs_readdir_descriptor_t *desc, | |
331 | struct nfs_entry *entry, struct file *file, struct inode *inode) | |
1da177e4 | 332 | { |
1da177e4 | 333 | struct rpc_cred *cred = nfs_file_cred(file); |
4704f0e2 | 334 | unsigned long timestamp, gencount; |
1da177e4 LT |
335 | int error; |
336 | ||
1da177e4 LT |
337 | again: |
338 | timestamp = jiffies; | |
4704f0e2 | 339 | gencount = nfs_inc_attr_generation_counter(); |
d1bacf9e | 340 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, xdr_page, |
1da177e4 LT |
341 | NFS_SERVER(inode)->dtsize, desc->plus); |
342 | if (error < 0) { | |
343 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
344 | if (error == -ENOTSUPP && desc->plus) { | |
345 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 346 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
347 | desc->plus = 0; |
348 | goto again; | |
349 | } | |
350 | goto error; | |
351 | } | |
1f4eab7e | 352 | desc->timestamp = timestamp; |
4704f0e2 | 353 | desc->gencount = gencount; |
d1bacf9e BS |
354 | error: |
355 | return error; | |
1da177e4 LT |
356 | } |
357 | ||
d1bacf9e BS |
358 | /* Fill in an entry based on the xdr code stored in desc->page */ |
359 | static | |
360 | int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, __be32 **ptr) | |
1da177e4 | 361 | { |
d1bacf9e BS |
362 | __be32 *p = *ptr; |
363 | p = desc->decode(p, entry, desc->plus); | |
1da177e4 LT |
364 | if (IS_ERR(p)) |
365 | return PTR_ERR(p); | |
d1bacf9e | 366 | *ptr = p; |
1da177e4 | 367 | |
d1bacf9e BS |
368 | entry->fattr->time_start = desc->timestamp; |
369 | entry->fattr->gencount = desc->gencount; | |
370 | return 0; | |
1da177e4 LT |
371 | } |
372 | ||
d39ab9de BS |
373 | static |
374 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
375 | { | |
376 | struct nfs_inode *node; | |
377 | if (dentry->d_inode == NULL) | |
378 | goto different; | |
379 | node = NFS_I(dentry->d_inode); | |
380 | if (node->fh.size != entry->fh->size) | |
381 | goto different; | |
382 | if (strncmp(node->fh.data, entry->fh->data, node->fh.size) != 0) | |
383 | goto different; | |
384 | return 1; | |
385 | different: | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static | |
390 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
391 | { | |
392 | struct qstr filename; | |
393 | struct dentry *dentry = NULL; | |
394 | struct dentry *alias = NULL; | |
395 | struct inode *dir = parent->d_inode; | |
396 | struct inode *inode; | |
397 | ||
398 | nfs_readdir_make_qstr(&filename, entry->name, entry->len); | |
399 | if (filename.len == 1 && filename.name[0] == '.') | |
400 | dentry = dget(parent); | |
401 | else if (filename.len == 2 && filename.name[0] == '.' | |
402 | && filename.name[1] == '.') | |
403 | dentry = dget_parent(parent); | |
404 | else | |
405 | dentry = d_lookup(parent, &filename); | |
406 | ||
407 | if (dentry != NULL) { | |
408 | if (nfs_same_file(dentry, entry)) { | |
409 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
410 | goto out; | |
411 | } else { | |
412 | d_drop(dentry); | |
413 | dput(dentry); | |
414 | } | |
415 | } | |
416 | ||
417 | dentry = d_alloc(parent, &filename); | |
418 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
419 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
420 | if (IS_ERR(inode)) | |
421 | goto out; | |
422 | ||
423 | alias = d_materialise_unique(dentry, inode); | |
424 | if (IS_ERR(alias)) | |
425 | goto out; | |
426 | else if (alias) { | |
427 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
428 | dput(alias); | |
429 | } else | |
430 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
431 | ||
432 | out: | |
433 | dput(dentry); | |
434 | kfree(filename.name); | |
435 | return; | |
436 | } | |
437 | ||
d1bacf9e BS |
438 | /* Perform conversion from xdr to cache array */ |
439 | static | |
440 | void nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, | |
441 | struct page *xdr_page, struct page *page) | |
1da177e4 | 442 | { |
d1bacf9e BS |
443 | __be32 *ptr = kmap(xdr_page); |
444 | while (xdr_decode(desc, entry, &ptr) == 0) { | |
445 | if (nfs_readdir_add_to_array(entry, page) == -1) | |
1da177e4 | 446 | break; |
d39ab9de BS |
447 | if (desc->plus == 1) |
448 | nfs_prime_dcache(desc->file->f_path.dentry, entry); | |
1da177e4 | 449 | } |
d1bacf9e | 450 | kunmap(xdr_page); |
1da177e4 LT |
451 | } |
452 | ||
d1bacf9e BS |
453 | static |
454 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 455 | { |
d1bacf9e BS |
456 | struct page *xdr_page; |
457 | struct nfs_entry entry; | |
458 | struct file *file = desc->file; | |
459 | struct nfs_cache_array *array; | |
460 | int status = 0; | |
461 | ||
462 | entry.prev_cookie = 0; | |
463 | entry.cookie = *desc->dir_cookie; | |
464 | entry.eof = 0; | |
465 | entry.fh = nfs_alloc_fhandle(); | |
466 | entry.fattr = nfs_alloc_fattr(); | |
467 | if (entry.fh == NULL || entry.fattr == NULL) | |
468 | goto out; | |
00a92642 | 469 | |
d1bacf9e BS |
470 | array = nfs_readdir_get_array(page); |
471 | memset(array, 0, sizeof(struct nfs_cache_array)); | |
472 | array->eof_index = -1; | |
00a92642 | 473 | |
d1bacf9e BS |
474 | xdr_page = alloc_page(GFP_KERNEL); |
475 | if (!xdr_page) | |
476 | goto out_release_array; | |
477 | do { | |
478 | status = nfs_readdir_xdr_filler(xdr_page, desc, &entry, file, inode); | |
479 | if (status < 0) | |
00a92642 | 480 | break; |
d1bacf9e BS |
481 | nfs_readdir_page_filler(desc, &entry, xdr_page, page); |
482 | } while (array->eof_index < 0 && array->size < MAX_READDIR_ARRAY); | |
483 | ||
484 | put_page(xdr_page); | |
485 | out_release_array: | |
486 | nfs_readdir_release_array(page); | |
487 | out: | |
488 | nfs_free_fattr(entry.fattr); | |
489 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
490 | return status; |
491 | } | |
492 | ||
493 | /* | |
d1bacf9e BS |
494 | * Now we cache directories properly, by converting xdr information |
495 | * to an array that can be used for lookups later. This results in | |
496 | * fewer cache pages, since we can store more information on each page. | |
497 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 498 | */ |
d1bacf9e BS |
499 | static |
500 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 501 | { |
01cce933 | 502 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 503 | |
d1bacf9e BS |
504 | if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) |
505 | goto error; | |
506 | SetPageUptodate(page); | |
1da177e4 | 507 | |
d1bacf9e BS |
508 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
509 | /* Should never happen */ | |
510 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 511 | } |
d1bacf9e BS |
512 | unlock_page(page); |
513 | return 0; | |
514 | error: | |
515 | unlock_page(page); | |
516 | return -EIO; | |
517 | } | |
1da177e4 | 518 | |
d1bacf9e BS |
519 | static |
520 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
521 | { | |
522 | page_cache_release(desc->page); | |
523 | desc->page = NULL; | |
524 | } | |
525 | ||
526 | static | |
527 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
528 | { | |
529 | struct page *page; | |
530 | page = read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, | |
531 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); | |
532 | if (IS_ERR(page)) | |
533 | desc->eof = 1; | |
534 | return page; | |
1da177e4 LT |
535 | } |
536 | ||
537 | /* | |
d1bacf9e | 538 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 539 | */ |
d1bacf9e BS |
540 | static |
541 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
542 | { | |
543 | int res; | |
544 | ||
545 | desc->page = get_cache_page(desc); | |
546 | if (IS_ERR(desc->page)) | |
547 | return PTR_ERR(desc->page); | |
548 | ||
549 | res = nfs_readdir_search_array(desc); | |
550 | if (res == 0) | |
551 | return 0; | |
552 | cache_page_release(desc); | |
553 | return res; | |
554 | } | |
555 | ||
556 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
557 | static inline |
558 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
559 | { | |
d1bacf9e | 560 | int res = -EAGAIN; |
d1bacf9e BS |
561 | |
562 | while (1) { | |
563 | res = find_cache_page(desc); | |
1da177e4 LT |
564 | if (res != -EAGAIN) |
565 | break; | |
d1bacf9e | 566 | desc->page_index++; |
1da177e4 | 567 | } |
1da177e4 LT |
568 | return res; |
569 | } | |
570 | ||
571 | static inline unsigned int dt_type(struct inode *inode) | |
572 | { | |
573 | return (inode->i_mode >> 12) & 15; | |
574 | } | |
575 | ||
1da177e4 LT |
576 | /* |
577 | * Once we've found the start of the dirent within a page: fill 'er up... | |
578 | */ | |
579 | static | |
580 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
581 | filldir_t filldir) | |
582 | { | |
583 | struct file *file = desc->file; | |
d1bacf9e BS |
584 | int i = 0; |
585 | int res = 0; | |
586 | struct nfs_cache_array *array = NULL; | |
587 | unsigned int d_type = DT_UNKNOWN; | |
588 | struct dentry *dentry = NULL; | |
589 | ||
590 | array = nfs_readdir_get_array(desc->page); | |
591 | ||
592 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
593 | d_type = DT_UNKNOWN; | |
1da177e4 | 594 | |
d1bacf9e BS |
595 | res = filldir(dirent, array->array[i].string.name, |
596 | array->array[i].string.len, file->f_pos, | |
597 | nfs_compat_user_ino64(array->array[i].ino), d_type); | |
1da177e4 LT |
598 | if (res < 0) |
599 | break; | |
00a92642 | 600 | file->f_pos++; |
d1bacf9e BS |
601 | desc->cache_entry_index = i; |
602 | if (i < (array->size-1)) | |
603 | *desc->dir_cookie = array->array[i+1].cookie; | |
604 | else | |
605 | *desc->dir_cookie = array->last_cookie; | |
606 | if (i == array->eof_index) { | |
607 | desc->eof = 1; | |
1da177e4 LT |
608 | break; |
609 | } | |
1da177e4 | 610 | } |
d1bacf9e BS |
611 | |
612 | nfs_readdir_release_array(desc->page); | |
613 | cache_page_release(desc); | |
1da177e4 LT |
614 | if (dentry != NULL) |
615 | dput(dentry); | |
1e7cb3dc CL |
616 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
617 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
618 | return res; |
619 | } | |
620 | ||
621 | /* | |
622 | * If we cannot find a cookie in our cache, we suspect that this is | |
623 | * because it points to a deleted file, so we ask the server to return | |
624 | * whatever it thinks is the next entry. We then feed this to filldir. | |
625 | * If all goes well, we should then be able to find our way round the | |
626 | * cache on the next call to readdir_search_pagecache(); | |
627 | * | |
628 | * NOTE: we cannot add the anonymous page to the pagecache because | |
629 | * the data it contains might not be page aligned. Besides, | |
630 | * we should already have a complete representation of the | |
631 | * directory in the page cache by the time we get here. | |
632 | */ | |
633 | static inline | |
634 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
635 | filldir_t filldir) | |
636 | { | |
1da177e4 LT |
637 | struct page *page = NULL; |
638 | int status; | |
d1bacf9e | 639 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 640 | |
1e7cb3dc CL |
641 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
642 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
643 | |
644 | page = alloc_page(GFP_HIGHUSER); | |
645 | if (!page) { | |
646 | status = -ENOMEM; | |
647 | goto out; | |
648 | } | |
d1bacf9e BS |
649 | |
650 | if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) { | |
1da177e4 | 651 | status = -EIO; |
1da177e4 | 652 | goto out_release; |
d1bacf9e | 653 | } |
1da177e4 | 654 | |
baf57a09 | 655 | desc->page_index = 0; |
d1bacf9e | 656 | desc->page = page; |
1da177e4 LT |
657 | status = nfs_do_filldir(desc, dirent, filldir); |
658 | ||
1da177e4 | 659 | out: |
1e7cb3dc | 660 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 661 | __func__, status); |
1da177e4 LT |
662 | return status; |
663 | out_release: | |
d1bacf9e | 664 | cache_page_release(desc); |
1da177e4 LT |
665 | goto out; |
666 | } | |
667 | ||
00a92642 OG |
668 | /* The file offset position represents the dirent entry number. A |
669 | last cookie cache takes care of the common case of reading the | |
670 | whole directory. | |
1da177e4 LT |
671 | */ |
672 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
673 | { | |
01cce933 | 674 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
675 | struct inode *inode = dentry->d_inode; |
676 | nfs_readdir_descriptor_t my_desc, | |
677 | *desc = &my_desc; | |
aa49b4cf | 678 | int res = -ENOMEM; |
1da177e4 | 679 | |
6da24bc9 | 680 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
681 | dentry->d_parent->d_name.name, dentry->d_name.name, |
682 | (long long)filp->f_pos); | |
91d5b470 CL |
683 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
684 | ||
1da177e4 | 685 | /* |
00a92642 | 686 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 687 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
688 | * to either find the entry with the appropriate number or |
689 | * revalidate the cookie. | |
1da177e4 LT |
690 | */ |
691 | memset(desc, 0, sizeof(*desc)); | |
692 | ||
693 | desc->file = filp; | |
cd3758e3 | 694 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
695 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
696 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
697 | ||
565277f6 | 698 | nfs_block_sillyrename(dentry); |
1cda707d | 699 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
700 | if (res < 0) |
701 | goto out; | |
702 | ||
d1bacf9e | 703 | while (desc->eof != 1) { |
1da177e4 | 704 | res = readdir_search_pagecache(desc); |
00a92642 | 705 | |
1da177e4 LT |
706 | if (res == -EBADCOOKIE) { |
707 | /* This means either end of directory */ | |
d1bacf9e | 708 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
709 | /* Or that the server has 'lost' a cookie */ |
710 | res = uncached_readdir(desc, dirent, filldir); | |
711 | if (res >= 0) | |
712 | continue; | |
713 | } | |
714 | res = 0; | |
715 | break; | |
716 | } | |
717 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 718 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 719 | nfs_zap_caches(inode); |
baf57a09 | 720 | desc->page_index = 0; |
1da177e4 | 721 | desc->plus = 0; |
d1bacf9e | 722 | desc->eof = 0; |
1da177e4 LT |
723 | continue; |
724 | } | |
725 | if (res < 0) | |
726 | break; | |
727 | ||
728 | res = nfs_do_filldir(desc, dirent, filldir); | |
729 | if (res < 0) { | |
730 | res = 0; | |
731 | break; | |
732 | } | |
733 | } | |
fccca7fc | 734 | out: |
565277f6 | 735 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
736 | if (res > 0) |
737 | res = 0; | |
aa49b4cf | 738 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
739 | dentry->d_parent->d_name.name, dentry->d_name.name, |
740 | res); | |
741 | return res; | |
1da177e4 LT |
742 | } |
743 | ||
10afec90 | 744 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 745 | { |
b84e06c5 CL |
746 | struct dentry *dentry = filp->f_path.dentry; |
747 | struct inode *inode = dentry->d_inode; | |
748 | ||
6da24bc9 | 749 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
750 | dentry->d_parent->d_name.name, |
751 | dentry->d_name.name, | |
752 | offset, origin); | |
753 | ||
754 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
755 | switch (origin) { |
756 | case 1: | |
757 | offset += filp->f_pos; | |
758 | case 0: | |
759 | if (offset >= 0) | |
760 | break; | |
761 | default: | |
762 | offset = -EINVAL; | |
763 | goto out; | |
764 | } | |
765 | if (offset != filp->f_pos) { | |
766 | filp->f_pos = offset; | |
cd3758e3 | 767 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
768 | } |
769 | out: | |
b84e06c5 | 770 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
771 | return offset; |
772 | } | |
773 | ||
1da177e4 LT |
774 | /* |
775 | * All directory operations under NFS are synchronous, so fsync() | |
776 | * is a dummy operation. | |
777 | */ | |
7ea80859 | 778 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 779 | { |
7ea80859 CH |
780 | struct dentry *dentry = filp->f_path.dentry; |
781 | ||
6da24bc9 | 782 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
783 | dentry->d_parent->d_name.name, dentry->d_name.name, |
784 | datasync); | |
785 | ||
54917786 | 786 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
787 | return 0; |
788 | } | |
789 | ||
bfc69a45 TM |
790 | /** |
791 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
792 | * @dir - pointer to directory inode | |
793 | * | |
794 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
795 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
796 | * on the server that might have invalidated our dcache. | |
797 | * | |
798 | * The caller should be holding dir->i_lock | |
799 | */ | |
800 | void nfs_force_lookup_revalidate(struct inode *dir) | |
801 | { | |
011935a0 | 802 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
803 | } |
804 | ||
1da177e4 LT |
805 | /* |
806 | * A check for whether or not the parent directory has changed. | |
807 | * In the case it has, we assume that the dentries are untrustworthy | |
808 | * and may need to be looked up again. | |
809 | */ | |
c79ba787 | 810 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
811 | { |
812 | if (IS_ROOT(dentry)) | |
813 | return 1; | |
4eec952e TM |
814 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
815 | return 0; | |
f2c77f4e TM |
816 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
817 | return 0; | |
818 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
819 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
820 | return 0; | |
821 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
822 | return 0; | |
823 | return 1; | |
1da177e4 LT |
824 | } |
825 | ||
1d6757fb TM |
826 | /* |
827 | * Return the intent data that applies to this particular path component | |
828 | * | |
829 | * Note that the current set of intents only apply to the very last | |
830 | * component of the path. | |
831 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
832 | */ | |
833 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
834 | { | |
835 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
836 | return 0; | |
837 | return nd->flags & mask; | |
838 | } | |
839 | ||
a12802ca TM |
840 | /* |
841 | * Use intent information to check whether or not we're going to do | |
842 | * an O_EXCL create using this path component. | |
843 | */ | |
844 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
845 | { | |
846 | if (NFS_PROTO(dir)->version == 2) | |
847 | return 0; | |
3516586a | 848 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
849 | } |
850 | ||
1d6757fb TM |
851 | /* |
852 | * Inode and filehandle revalidation for lookups. | |
853 | * | |
854 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
855 | * or if the intent information indicates that we're about to open this | |
856 | * particular file and the "nocto" mount flag is not set. | |
857 | * | |
858 | */ | |
1da177e4 LT |
859 | static inline |
860 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
861 | { | |
862 | struct nfs_server *server = NFS_SERVER(inode); | |
863 | ||
4e99a1ff TM |
864 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
865 | return 0; | |
1da177e4 | 866 | if (nd != NULL) { |
1da177e4 | 867 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 868 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
869 | goto out_force; |
870 | /* This is an open(2) */ | |
1d6757fb | 871 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
872 | !(server->flags & NFS_MOUNT_NOCTO) && |
873 | (S_ISREG(inode->i_mode) || | |
874 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 875 | goto out_force; |
4f48af45 | 876 | return 0; |
1da177e4 LT |
877 | } |
878 | return nfs_revalidate_inode(server, inode); | |
879 | out_force: | |
880 | return __nfs_revalidate_inode(server, inode); | |
881 | } | |
882 | ||
883 | /* | |
884 | * We judge how long we want to trust negative | |
885 | * dentries by looking at the parent inode mtime. | |
886 | * | |
887 | * If parent mtime has changed, we revalidate, else we wait for a | |
888 | * period corresponding to the parent's attribute cache timeout value. | |
889 | */ | |
890 | static inline | |
891 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
892 | struct nameidata *nd) | |
893 | { | |
1da177e4 | 894 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 895 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 896 | return 0; |
4eec952e TM |
897 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
898 | return 1; | |
1da177e4 LT |
899 | return !nfs_check_verifier(dir, dentry); |
900 | } | |
901 | ||
902 | /* | |
903 | * This is called every time the dcache has a lookup hit, | |
904 | * and we should check whether we can really trust that | |
905 | * lookup. | |
906 | * | |
907 | * NOTE! The hit can be a negative hit too, don't assume | |
908 | * we have an inode! | |
909 | * | |
910 | * If the parent directory is seen to have changed, we throw out the | |
911 | * cached dentry and do a new lookup. | |
912 | */ | |
913 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
914 | { | |
915 | struct inode *dir; | |
916 | struct inode *inode; | |
917 | struct dentry *parent; | |
e1fb4d05 TM |
918 | struct nfs_fh *fhandle = NULL; |
919 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 920 | int error; |
1da177e4 LT |
921 | |
922 | parent = dget_parent(dentry); | |
1da177e4 | 923 | dir = parent->d_inode; |
91d5b470 | 924 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
925 | inode = dentry->d_inode; |
926 | ||
927 | if (!inode) { | |
928 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
929 | goto out_bad; | |
930 | goto out_valid; | |
931 | } | |
932 | ||
933 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 934 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 935 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 936 | dentry->d_name.name); |
1da177e4 LT |
937 | goto out_bad; |
938 | } | |
939 | ||
15860ab1 TM |
940 | if (nfs_have_delegation(inode, FMODE_READ)) |
941 | goto out_set_verifier; | |
942 | ||
1da177e4 | 943 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 944 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
945 | if (nfs_lookup_verify_inode(inode, nd)) |
946 | goto out_zap_parent; | |
947 | goto out_valid; | |
948 | } | |
949 | ||
950 | if (NFS_STALE(inode)) | |
951 | goto out_bad; | |
952 | ||
e1fb4d05 TM |
953 | error = -ENOMEM; |
954 | fhandle = nfs_alloc_fhandle(); | |
955 | fattr = nfs_alloc_fattr(); | |
956 | if (fhandle == NULL || fattr == NULL) | |
957 | goto out_error; | |
958 | ||
959 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1da177e4 LT |
960 | if (error) |
961 | goto out_bad; | |
e1fb4d05 | 962 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 963 | goto out_bad; |
e1fb4d05 | 964 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
965 | goto out_bad; |
966 | ||
e1fb4d05 TM |
967 | nfs_free_fattr(fattr); |
968 | nfs_free_fhandle(fhandle); | |
15860ab1 | 969 | out_set_verifier: |
cf8ba45e | 970 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 971 | out_valid: |
1da177e4 | 972 | dput(parent); |
1e7cb3dc | 973 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 974 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 975 | dentry->d_name.name); |
1da177e4 LT |
976 | return 1; |
977 | out_zap_parent: | |
978 | nfs_zap_caches(dir); | |
979 | out_bad: | |
a1643a92 | 980 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
981 | if (inode && S_ISDIR(inode->i_mode)) { |
982 | /* Purge readdir caches. */ | |
983 | nfs_zap_caches(inode); | |
984 | /* If we have submounts, don't unhash ! */ | |
985 | if (have_submounts(dentry)) | |
986 | goto out_valid; | |
d9e80b7d AV |
987 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
988 | goto out_valid; | |
1da177e4 LT |
989 | shrink_dcache_parent(dentry); |
990 | } | |
991 | d_drop(dentry); | |
e1fb4d05 TM |
992 | nfs_free_fattr(fattr); |
993 | nfs_free_fhandle(fhandle); | |
1da177e4 | 994 | dput(parent); |
1e7cb3dc | 995 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 996 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 997 | dentry->d_name.name); |
1da177e4 | 998 | return 0; |
e1fb4d05 TM |
999 | out_error: |
1000 | nfs_free_fattr(fattr); | |
1001 | nfs_free_fhandle(fhandle); | |
1002 | dput(parent); | |
1003 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1004 | __func__, dentry->d_parent->d_name.name, | |
1005 | dentry->d_name.name, error); | |
1006 | return error; | |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * This is called from dput() when d_count is going to 0. | |
1011 | */ | |
1012 | static int nfs_dentry_delete(struct dentry *dentry) | |
1013 | { | |
1014 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1015 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1016 | dentry->d_flags); | |
1017 | ||
77f11192 TM |
1018 | /* Unhash any dentry with a stale inode */ |
1019 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1020 | return 1; | |
1021 | ||
1da177e4 LT |
1022 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1023 | /* Unhash it, so that ->d_iput() would be called */ | |
1024 | return 1; | |
1025 | } | |
1026 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1027 | /* Unhash it, so that ancestors of killed async unlink | |
1028 | * files will be cleaned up during umount */ | |
1029 | return 1; | |
1030 | } | |
1031 | return 0; | |
1032 | ||
1033 | } | |
1034 | ||
1b83d707 TM |
1035 | static void nfs_drop_nlink(struct inode *inode) |
1036 | { | |
1037 | spin_lock(&inode->i_lock); | |
1038 | if (inode->i_nlink > 0) | |
1039 | drop_nlink(inode); | |
1040 | spin_unlock(&inode->i_lock); | |
1041 | } | |
1042 | ||
1da177e4 LT |
1043 | /* |
1044 | * Called when the dentry loses inode. | |
1045 | * We use it to clean up silly-renamed files. | |
1046 | */ | |
1047 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1048 | { | |
83672d39 NB |
1049 | if (S_ISDIR(inode->i_mode)) |
1050 | /* drop any readdir cache as it could easily be old */ | |
1051 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1052 | ||
1da177e4 | 1053 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1054 | drop_nlink(inode); |
e4eff1a6 | 1055 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1056 | } |
1da177e4 LT |
1057 | iput(inode); |
1058 | } | |
1059 | ||
f786aa90 | 1060 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1061 | .d_revalidate = nfs_lookup_revalidate, |
1062 | .d_delete = nfs_dentry_delete, | |
1063 | .d_iput = nfs_dentry_iput, | |
1064 | }; | |
1065 | ||
1da177e4 LT |
1066 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1067 | { | |
1068 | struct dentry *res; | |
565277f6 | 1069 | struct dentry *parent; |
1da177e4 | 1070 | struct inode *inode = NULL; |
e1fb4d05 TM |
1071 | struct nfs_fh *fhandle = NULL; |
1072 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1073 | int error; |
1da177e4 LT |
1074 | |
1075 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1076 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1077 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1078 | |
1079 | res = ERR_PTR(-ENAMETOOLONG); | |
1080 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1081 | goto out; | |
1082 | ||
1da177e4 LT |
1083 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
1084 | ||
fd684071 TM |
1085 | /* |
1086 | * If we're doing an exclusive create, optimize away the lookup | |
1087 | * but don't hash the dentry. | |
1088 | */ | |
1089 | if (nfs_is_exclusive_create(dir, nd)) { | |
1090 | d_instantiate(dentry, NULL); | |
1091 | res = NULL; | |
fc0f684c | 1092 | goto out; |
fd684071 | 1093 | } |
1da177e4 | 1094 | |
e1fb4d05 TM |
1095 | res = ERR_PTR(-ENOMEM); |
1096 | fhandle = nfs_alloc_fhandle(); | |
1097 | fattr = nfs_alloc_fattr(); | |
1098 | if (fhandle == NULL || fattr == NULL) | |
1099 | goto out; | |
1100 | ||
565277f6 TM |
1101 | parent = dentry->d_parent; |
1102 | /* Protect against concurrent sillydeletes */ | |
1103 | nfs_block_sillyrename(parent); | |
e1fb4d05 | 1104 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1105 | if (error == -ENOENT) |
1106 | goto no_entry; | |
1107 | if (error < 0) { | |
1108 | res = ERR_PTR(error); | |
565277f6 | 1109 | goto out_unblock_sillyrename; |
1da177e4 | 1110 | } |
e1fb4d05 | 1111 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1112 | res = (struct dentry *)inode; |
1113 | if (IS_ERR(res)) | |
565277f6 | 1114 | goto out_unblock_sillyrename; |
54ceac45 | 1115 | |
1da177e4 | 1116 | no_entry: |
54ceac45 | 1117 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1118 | if (res != NULL) { |
1119 | if (IS_ERR(res)) | |
565277f6 | 1120 | goto out_unblock_sillyrename; |
1da177e4 | 1121 | dentry = res; |
9eaef27b | 1122 | } |
1da177e4 | 1123 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1124 | out_unblock_sillyrename: |
1125 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1126 | out: |
e1fb4d05 TM |
1127 | nfs_free_fattr(fattr); |
1128 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1129 | return res; |
1130 | } | |
1131 | ||
1132 | #ifdef CONFIG_NFS_V4 | |
1133 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1134 | ||
f786aa90 | 1135 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1136 | .d_revalidate = nfs_open_revalidate, |
1137 | .d_delete = nfs_dentry_delete, | |
1138 | .d_iput = nfs_dentry_iput, | |
1139 | }; | |
1140 | ||
1d6757fb TM |
1141 | /* |
1142 | * Use intent information to determine whether we need to substitute | |
1143 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1144 | */ | |
5584c306 | 1145 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1146 | { |
1d6757fb | 1147 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1148 | return 0; |
1149 | /* NFS does not (yet) have a stateful open for directories */ | |
1150 | if (nd->flags & LOOKUP_DIRECTORY) | |
1151 | return 0; | |
1152 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1153 | if (__mnt_is_readonly(nd->path.mnt) && |
1154 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1155 | return 0; |
1156 | return 1; | |
1157 | } | |
1158 | ||
cd9a1c0e TM |
1159 | static struct nfs_open_context *nameidata_to_nfs_open_context(struct dentry *dentry, struct nameidata *nd) |
1160 | { | |
1161 | struct path path = { | |
1162 | .mnt = nd->path.mnt, | |
1163 | .dentry = dentry, | |
1164 | }; | |
1165 | struct nfs_open_context *ctx; | |
1166 | struct rpc_cred *cred; | |
1167 | fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC); | |
1168 | ||
1169 | cred = rpc_lookup_cred(); | |
1170 | if (IS_ERR(cred)) | |
1171 | return ERR_CAST(cred); | |
1172 | ctx = alloc_nfs_open_context(&path, cred, fmode); | |
1173 | put_rpccred(cred); | |
1174 | if (ctx == NULL) | |
1175 | return ERR_PTR(-ENOMEM); | |
1176 | return ctx; | |
1177 | } | |
1178 | ||
1179 | static int do_open(struct inode *inode, struct file *filp) | |
1180 | { | |
1181 | nfs_fscache_set_inode_cookie(inode, filp); | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1186 | { | |
1187 | struct file *filp; | |
1188 | int ret = 0; | |
1189 | ||
1190 | /* If the open_intent is for execute, we have an extra check to make */ | |
1191 | if (ctx->mode & FMODE_EXEC) { | |
1192 | ret = nfs_may_open(ctx->path.dentry->d_inode, | |
1193 | ctx->cred, | |
1194 | nd->intent.open.flags); | |
1195 | if (ret < 0) | |
1196 | goto out; | |
1197 | } | |
1198 | filp = lookup_instantiate_filp(nd, ctx->path.dentry, do_open); | |
1199 | if (IS_ERR(filp)) | |
1200 | ret = PTR_ERR(filp); | |
1201 | else | |
1202 | nfs_file_set_open_context(filp, ctx); | |
1203 | out: | |
1204 | put_nfs_open_context(ctx); | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1da177e4 LT |
1208 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1209 | { | |
cd9a1c0e TM |
1210 | struct nfs_open_context *ctx; |
1211 | struct iattr attr; | |
1da177e4 | 1212 | struct dentry *res = NULL; |
f46e0bd3 | 1213 | struct inode *inode; |
cd9a1c0e | 1214 | int open_flags; |
898f635c | 1215 | int err; |
1da177e4 | 1216 | |
1e7cb3dc CL |
1217 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1218 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1219 | ||
1da177e4 | 1220 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1221 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1222 | goto no_open; |
1223 | ||
1224 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1225 | res = ERR_PTR(-ENAMETOOLONG); | |
1226 | goto out; | |
1227 | } | |
1228 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1229 | ||
d4d9cdcb TM |
1230 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1231 | * the dentry. */ | |
3516586a | 1232 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1233 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1234 | goto out; |
1235 | } | |
1da177e4 | 1236 | |
cd9a1c0e TM |
1237 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1238 | res = ERR_CAST(ctx); | |
1239 | if (IS_ERR(ctx)) | |
1240 | goto out; | |
1241 | ||
1242 | open_flags = nd->intent.open.flags; | |
1243 | if (nd->flags & LOOKUP_CREATE) { | |
1244 | attr.ia_mode = nd->intent.open.create_mode; | |
1245 | attr.ia_valid = ATTR_MODE; | |
1246 | if (!IS_POSIXACL(dir)) | |
1247 | attr.ia_mode &= ~current_umask(); | |
1248 | } else { | |
898f635c | 1249 | open_flags &= ~(O_EXCL | O_CREAT); |
cd9a1c0e | 1250 | attr.ia_valid = 0; |
cd9a1c0e TM |
1251 | } |
1252 | ||
1da177e4 | 1253 | /* Open the file on the server */ |
f46e0bd3 | 1254 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1255 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1256 | if (IS_ERR(inode)) { |
1257 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1258 | put_nfs_open_context(ctx); |
f46e0bd3 | 1259 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1260 | /* Make a negative dentry */ |
1261 | case -ENOENT: | |
f46e0bd3 | 1262 | d_add(dentry, NULL); |
02a913a7 TM |
1263 | res = NULL; |
1264 | goto out; | |
1da177e4 | 1265 | /* This turned out not to be a regular file */ |
80e60639 | 1266 | case -EISDIR: |
6f926b5b TM |
1267 | case -ENOTDIR: |
1268 | goto no_open; | |
1da177e4 LT |
1269 | case -ELOOP: |
1270 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1271 | goto no_open; | |
1da177e4 LT |
1272 | /* case -EINVAL: */ |
1273 | default: | |
f46e0bd3 | 1274 | res = ERR_CAST(inode); |
1da177e4 LT |
1275 | goto out; |
1276 | } | |
cd9a1c0e | 1277 | } |
f46e0bd3 | 1278 | res = d_add_unique(dentry, inode); |
898f635c | 1279 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 TM |
1280 | if (res != NULL) { |
1281 | dput(ctx->path.dentry); | |
1282 | ctx->path.dentry = dget(res); | |
1da177e4 | 1283 | dentry = res; |
f46e0bd3 | 1284 | } |
898f635c TM |
1285 | err = nfs_intent_set_file(nd, ctx); |
1286 | if (err < 0) { | |
1287 | if (res != NULL) | |
1288 | dput(res); | |
1289 | return ERR_PTR(err); | |
1290 | } | |
1da177e4 | 1291 | out: |
f46e0bd3 | 1292 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1293 | return res; |
1294 | no_open: | |
1295 | return nfs_lookup(dir, dentry, nd); | |
1296 | } | |
1297 | ||
1298 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1299 | { | |
1300 | struct dentry *parent = NULL; | |
1301 | struct inode *inode = dentry->d_inode; | |
1302 | struct inode *dir; | |
b8d4cadd | 1303 | struct nfs_open_context *ctx; |
1da177e4 LT |
1304 | int openflags, ret = 0; |
1305 | ||
1f063d2c | 1306 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1307 | goto no_open; |
2b484297 | 1308 | |
1da177e4 LT |
1309 | parent = dget_parent(dentry); |
1310 | dir = parent->d_inode; | |
2b484297 | 1311 | |
1da177e4 LT |
1312 | /* We can't create new files in nfs_open_revalidate(), so we |
1313 | * optimize away revalidation of negative dentries. | |
1314 | */ | |
216d5d06 TM |
1315 | if (inode == NULL) { |
1316 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1317 | ret = 1; | |
1da177e4 | 1318 | goto out; |
216d5d06 TM |
1319 | } |
1320 | ||
1da177e4 LT |
1321 | /* NFS only supports OPEN on regular files */ |
1322 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1323 | goto no_open_dput; |
1da177e4 LT |
1324 | openflags = nd->intent.open.flags; |
1325 | /* We cannot do exclusive creation on a positive dentry */ | |
1326 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1327 | goto no_open_dput; |
1da177e4 | 1328 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1329 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 | 1330 | |
b8d4cadd TM |
1331 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1332 | ret = PTR_ERR(ctx); | |
1333 | if (IS_ERR(ctx)) | |
1334 | goto out; | |
1da177e4 | 1335 | /* |
1b1dcc1b | 1336 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1337 | * operations that change the directory. We therefore save the |
1338 | * change attribute *before* we do the RPC call. | |
1339 | */ | |
2b484297 | 1340 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, NULL); |
535918f1 TM |
1341 | if (IS_ERR(inode)) { |
1342 | ret = PTR_ERR(inode); | |
1343 | switch (ret) { | |
1344 | case -EPERM: | |
1345 | case -EACCES: | |
1346 | case -EDQUOT: | |
1347 | case -ENOSPC: | |
1348 | case -EROFS: | |
1349 | goto out_put_ctx; | |
1350 | default: | |
1351 | goto out_drop; | |
1352 | } | |
1353 | } | |
1354 | iput(inode); | |
898f635c | 1355 | if (inode != dentry->d_inode) |
535918f1 | 1356 | goto out_drop; |
898f635c TM |
1357 | |
1358 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1359 | ret = nfs_intent_set_file(nd, ctx); | |
1360 | if (ret >= 0) | |
1361 | ret = 1; | |
1da177e4 LT |
1362 | out: |
1363 | dput(parent); | |
1da177e4 | 1364 | return ret; |
535918f1 TM |
1365 | out_drop: |
1366 | d_drop(dentry); | |
1367 | ret = 0; | |
1368 | out_put_ctx: | |
1369 | put_nfs_open_context(ctx); | |
1370 | goto out; | |
1371 | ||
5584c306 | 1372 | no_open_dput: |
1da177e4 | 1373 | dput(parent); |
5584c306 | 1374 | no_open: |
1da177e4 LT |
1375 | return nfs_lookup_revalidate(dentry, nd); |
1376 | } | |
c0204fd2 TM |
1377 | |
1378 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, | |
1379 | struct nameidata *nd) | |
1380 | { | |
1381 | struct nfs_open_context *ctx = NULL; | |
1382 | struct iattr attr; | |
1383 | int error; | |
1384 | int open_flags = 0; | |
1385 | ||
1386 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1387 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1388 | ||
1389 | attr.ia_mode = mode; | |
1390 | attr.ia_valid = ATTR_MODE; | |
1391 | ||
1392 | if ((nd->flags & LOOKUP_CREATE) != 0) { | |
1393 | open_flags = nd->intent.open.flags; | |
1394 | ||
1395 | ctx = nameidata_to_nfs_open_context(dentry, nd); | |
1396 | error = PTR_ERR(ctx); | |
1397 | if (IS_ERR(ctx)) | |
898f635c | 1398 | goto out_err_drop; |
c0204fd2 TM |
1399 | } |
1400 | ||
1401 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1402 | if (error != 0) | |
1403 | goto out_put_ctx; | |
898f635c TM |
1404 | if (ctx != NULL) { |
1405 | error = nfs_intent_set_file(nd, ctx); | |
1406 | if (error < 0) | |
1407 | goto out_err; | |
1408 | } | |
c0204fd2 TM |
1409 | return 0; |
1410 | out_put_ctx: | |
1411 | if (ctx != NULL) | |
1412 | put_nfs_open_context(ctx); | |
898f635c | 1413 | out_err_drop: |
c0204fd2 | 1414 | d_drop(dentry); |
898f635c | 1415 | out_err: |
c0204fd2 TM |
1416 | return error; |
1417 | } | |
1418 | ||
1da177e4 LT |
1419 | #endif /* CONFIG_NFSV4 */ |
1420 | ||
1da177e4 LT |
1421 | /* |
1422 | * Code common to create, mkdir, and mknod. | |
1423 | */ | |
1424 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1425 | struct nfs_fattr *fattr) | |
1426 | { | |
fab728e1 TM |
1427 | struct dentry *parent = dget_parent(dentry); |
1428 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1429 | struct inode *inode; |
1430 | int error = -EACCES; | |
1431 | ||
fab728e1 TM |
1432 | d_drop(dentry); |
1433 | ||
1da177e4 LT |
1434 | /* We may have been initialized further down */ |
1435 | if (dentry->d_inode) | |
fab728e1 | 1436 | goto out; |
1da177e4 | 1437 | if (fhandle->size == 0) { |
1da177e4 LT |
1438 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1439 | if (error) | |
fab728e1 | 1440 | goto out_error; |
1da177e4 | 1441 | } |
5724ab37 | 1442 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1443 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1444 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1445 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1446 | if (error < 0) |
fab728e1 | 1447 | goto out_error; |
1da177e4 | 1448 | } |
1da177e4 | 1449 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1450 | error = PTR_ERR(inode); |
1451 | if (IS_ERR(inode)) | |
fab728e1 TM |
1452 | goto out_error; |
1453 | d_add(dentry, inode); | |
1454 | out: | |
1455 | dput(parent); | |
1da177e4 | 1456 | return 0; |
fab728e1 TM |
1457 | out_error: |
1458 | nfs_mark_for_revalidate(dir); | |
1459 | dput(parent); | |
1460 | return error; | |
1da177e4 LT |
1461 | } |
1462 | ||
1463 | /* | |
1464 | * Following a failed create operation, we drop the dentry rather | |
1465 | * than retain a negative dentry. This avoids a problem in the event | |
1466 | * that the operation succeeded on the server, but an error in the | |
1467 | * reply path made it appear to have failed. | |
1468 | */ | |
1469 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1470 | struct nameidata *nd) | |
1471 | { | |
1472 | struct iattr attr; | |
1473 | int error; | |
1da177e4 | 1474 | |
1e7cb3dc CL |
1475 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1476 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1477 | |
1478 | attr.ia_mode = mode; | |
1479 | attr.ia_valid = ATTR_MODE; | |
1480 | ||
c0204fd2 | 1481 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, 0, NULL); |
1da177e4 LT |
1482 | if (error != 0) |
1483 | goto out_err; | |
1da177e4 LT |
1484 | return 0; |
1485 | out_err: | |
1da177e4 LT |
1486 | d_drop(dentry); |
1487 | return error; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * See comments for nfs_proc_create regarding failed operations. | |
1492 | */ | |
1493 | static int | |
1494 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1495 | { | |
1496 | struct iattr attr; | |
1497 | int status; | |
1498 | ||
1e7cb3dc CL |
1499 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1500 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1501 | |
1502 | if (!new_valid_dev(rdev)) | |
1503 | return -EINVAL; | |
1504 | ||
1505 | attr.ia_mode = mode; | |
1506 | attr.ia_valid = ATTR_MODE; | |
1507 | ||
1da177e4 | 1508 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1509 | if (status != 0) |
1510 | goto out_err; | |
1da177e4 LT |
1511 | return 0; |
1512 | out_err: | |
1da177e4 LT |
1513 | d_drop(dentry); |
1514 | return status; | |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * See comments for nfs_proc_create regarding failed operations. | |
1519 | */ | |
1520 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1521 | { | |
1522 | struct iattr attr; | |
1523 | int error; | |
1524 | ||
1e7cb3dc CL |
1525 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1526 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1527 | |
1528 | attr.ia_valid = ATTR_MODE; | |
1529 | attr.ia_mode = mode | S_IFDIR; | |
1530 | ||
1da177e4 | 1531 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1532 | if (error != 0) |
1533 | goto out_err; | |
1da177e4 LT |
1534 | return 0; |
1535 | out_err: | |
1536 | d_drop(dentry); | |
1da177e4 LT |
1537 | return error; |
1538 | } | |
1539 | ||
d45b9d8b TM |
1540 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1541 | { | |
1542 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1543 | d_delete(dentry); | |
1544 | } | |
1545 | ||
1da177e4 LT |
1546 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1547 | { | |
1548 | int error; | |
1549 | ||
1e7cb3dc CL |
1550 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1551 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1552 | |
1da177e4 LT |
1553 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1554 | /* Ensure the VFS deletes this inode */ | |
1555 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1556 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1557 | else if (error == -ENOENT) |
1558 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1559 | |
1560 | return error; | |
1561 | } | |
1562 | ||
1da177e4 LT |
1563 | /* |
1564 | * Remove a file after making sure there are no pending writes, | |
1565 | * and after checking that the file has only one user. | |
1566 | * | |
1567 | * We invalidate the attribute cache and free the inode prior to the operation | |
1568 | * to avoid possible races if the server reuses the inode. | |
1569 | */ | |
1570 | static int nfs_safe_remove(struct dentry *dentry) | |
1571 | { | |
1572 | struct inode *dir = dentry->d_parent->d_inode; | |
1573 | struct inode *inode = dentry->d_inode; | |
1574 | int error = -EBUSY; | |
1575 | ||
1576 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1577 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1578 | ||
1579 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1580 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1581 | error = 0; | |
1582 | goto out; | |
1583 | } | |
1584 | ||
1da177e4 | 1585 | if (inode != NULL) { |
cae7a073 | 1586 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1587 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1588 | /* The VFS may want to delete this inode */ | |
1589 | if (error == 0) | |
1b83d707 | 1590 | nfs_drop_nlink(inode); |
5ba7cc48 | 1591 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1592 | } else |
1593 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1594 | if (error == -ENOENT) |
1595 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1596 | out: |
1597 | return error; | |
1598 | } | |
1599 | ||
1600 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1601 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1602 | * | |
1603 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1604 | */ | |
1605 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1606 | { | |
1607 | int error; | |
1608 | int need_rehash = 0; | |
1609 | ||
1610 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1611 | dir->i_ino, dentry->d_name.name); | |
1612 | ||
1da177e4 LT |
1613 | spin_lock(&dcache_lock); |
1614 | spin_lock(&dentry->d_lock); | |
1615 | if (atomic_read(&dentry->d_count) > 1) { | |
1616 | spin_unlock(&dentry->d_lock); | |
1617 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1618 | /* Start asynchronous writeout of the inode */ |
1619 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1620 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1621 | return error; |
1622 | } | |
1623 | if (!d_unhashed(dentry)) { | |
1624 | __d_drop(dentry); | |
1625 | need_rehash = 1; | |
1626 | } | |
1627 | spin_unlock(&dentry->d_lock); | |
1628 | spin_unlock(&dcache_lock); | |
1629 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1630 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1631 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1632 | } else if (need_rehash) | |
1633 | d_rehash(dentry); | |
1da177e4 LT |
1634 | return error; |
1635 | } | |
1636 | ||
873101b3 CL |
1637 | /* |
1638 | * To create a symbolic link, most file systems instantiate a new inode, | |
1639 | * add a page to it containing the path, then write it out to the disk | |
1640 | * using prepare_write/commit_write. | |
1641 | * | |
1642 | * Unfortunately the NFS client can't create the in-core inode first | |
1643 | * because it needs a file handle to create an in-core inode (see | |
1644 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1645 | * symlink request has completed on the server. | |
1646 | * | |
1647 | * So instead we allocate a raw page, copy the symname into it, then do | |
1648 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1649 | * now have a new file handle and can instantiate an in-core NFS inode | |
1650 | * and move the raw page into its mapping. | |
1651 | */ | |
1652 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1653 | { |
873101b3 CL |
1654 | struct pagevec lru_pvec; |
1655 | struct page *page; | |
1656 | char *kaddr; | |
1da177e4 | 1657 | struct iattr attr; |
873101b3 | 1658 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1659 | int error; |
1660 | ||
1661 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1662 | dir->i_ino, dentry->d_name.name, symname); | |
1663 | ||
873101b3 CL |
1664 | if (pathlen > PAGE_SIZE) |
1665 | return -ENAMETOOLONG; | |
1da177e4 | 1666 | |
873101b3 CL |
1667 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1668 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1669 | |
83d93f22 | 1670 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1671 | if (!page) |
873101b3 | 1672 | return -ENOMEM; |
873101b3 CL |
1673 | |
1674 | kaddr = kmap_atomic(page, KM_USER0); | |
1675 | memcpy(kaddr, symname, pathlen); | |
1676 | if (pathlen < PAGE_SIZE) | |
1677 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1678 | kunmap_atomic(kaddr, KM_USER0); | |
1679 | ||
94a6d753 | 1680 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1681 | if (error != 0) { |
1682 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1683 | dir->i_sb->s_id, dir->i_ino, | |
1684 | dentry->d_name.name, symname, error); | |
1da177e4 | 1685 | d_drop(dentry); |
873101b3 | 1686 | __free_page(page); |
873101b3 CL |
1687 | return error; |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * No big deal if we can't add this page to the page cache here. | |
1692 | * READLINK will get the missing page from the server if needed. | |
1693 | */ | |
1694 | pagevec_init(&lru_pvec, 0); | |
1695 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1696 | GFP_KERNEL)) { | |
39cf8a13 | 1697 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1698 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1699 | SetPageUptodate(page); |
1700 | unlock_page(page); | |
1701 | } else | |
1702 | __free_page(page); | |
1703 | ||
873101b3 | 1704 | return 0; |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | static int | |
1708 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1709 | { | |
1710 | struct inode *inode = old_dentry->d_inode; | |
1711 | int error; | |
1712 | ||
1713 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1714 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1715 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1716 | ||
9a3936aa TM |
1717 | nfs_inode_return_delegation(inode); |
1718 | ||
9697d234 | 1719 | d_drop(dentry); |
1da177e4 | 1720 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 TM |
1721 | if (error == 0) { |
1722 | atomic_inc(&inode->i_count); | |
9697d234 | 1723 | d_add(dentry, inode); |
cf809556 | 1724 | } |
1da177e4 LT |
1725 | return error; |
1726 | } | |
1727 | ||
1728 | /* | |
1729 | * RENAME | |
1730 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1731 | * different file handle for the same inode after a rename (e.g. when | |
1732 | * moving to a different directory). A fail-safe method to do so would | |
1733 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1734 | * rename the old file using the sillyrename stuff. This way, the original | |
1735 | * file in old_dir will go away when the last process iput()s the inode. | |
1736 | * | |
1737 | * FIXED. | |
1738 | * | |
1739 | * It actually works quite well. One needs to have the possibility for | |
1740 | * at least one ".nfs..." file in each directory the file ever gets | |
1741 | * moved or linked to which happens automagically with the new | |
1742 | * implementation that only depends on the dcache stuff instead of | |
1743 | * using the inode layer | |
1744 | * | |
1745 | * Unfortunately, things are a little more complicated than indicated | |
1746 | * above. For a cross-directory move, we want to make sure we can get | |
1747 | * rid of the old inode after the operation. This means there must be | |
1748 | * no pending writes (if it's a file), and the use count must be 1. | |
1749 | * If these conditions are met, we can drop the dentries before doing | |
1750 | * the rename. | |
1751 | */ | |
1752 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1753 | struct inode *new_dir, struct dentry *new_dentry) | |
1754 | { | |
1755 | struct inode *old_inode = old_dentry->d_inode; | |
1756 | struct inode *new_inode = new_dentry->d_inode; | |
1757 | struct dentry *dentry = NULL, *rehash = NULL; | |
1758 | int error = -EBUSY; | |
1759 | ||
1da177e4 LT |
1760 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1761 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1762 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1763 | atomic_read(&new_dentry->d_count)); | |
1764 | ||
1765 | /* | |
28f79a1a MS |
1766 | * For non-directories, check whether the target is busy and if so, |
1767 | * make a copy of the dentry and then do a silly-rename. If the | |
1768 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1769 | * the new target. | |
1da177e4 | 1770 | */ |
27226104 MS |
1771 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1772 | /* | |
1773 | * To prevent any new references to the target during the | |
1774 | * rename, we unhash the dentry in advance. | |
1775 | */ | |
1776 | if (!d_unhashed(new_dentry)) { | |
1777 | d_drop(new_dentry); | |
1778 | rehash = new_dentry; | |
1779 | } | |
1da177e4 | 1780 | |
27226104 MS |
1781 | if (atomic_read(&new_dentry->d_count) > 2) { |
1782 | int err; | |
1783 | ||
1784 | /* copy the target dentry's name */ | |
1785 | dentry = d_alloc(new_dentry->d_parent, | |
1786 | &new_dentry->d_name); | |
1787 | if (!dentry) | |
1788 | goto out; | |
1789 | ||
1790 | /* silly-rename the existing target ... */ | |
1791 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1792 | if (err) |
27226104 | 1793 | goto out; |
24e93025 MS |
1794 | |
1795 | new_dentry = dentry; | |
56335936 | 1796 | rehash = NULL; |
24e93025 | 1797 | new_inode = NULL; |
27226104 | 1798 | } |
b1e4adf4 | 1799 | } |
1da177e4 | 1800 | |
cae7a073 | 1801 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1802 | if (new_inode != NULL) |
24174119 | 1803 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1804 | |
1da177e4 LT |
1805 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1806 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1807 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1808 | out: |
1809 | if (rehash) | |
1810 | d_rehash(rehash); | |
1811 | if (!error) { | |
b1e4adf4 TM |
1812 | if (new_inode != NULL) |
1813 | nfs_drop_nlink(new_inode); | |
349457cc | 1814 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1815 | nfs_set_verifier(new_dentry, |
1816 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1817 | } else if (error == -ENOENT) |
1818 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1819 | |
1820 | /* new dentry created? */ | |
1821 | if (dentry) | |
1822 | dput(dentry); | |
1da177e4 LT |
1823 | return error; |
1824 | } | |
1825 | ||
cfcea3e8 TM |
1826 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1827 | static LIST_HEAD(nfs_access_lru_list); | |
1828 | static atomic_long_t nfs_access_nr_entries; | |
1829 | ||
1c3c07e9 TM |
1830 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1831 | { | |
1832 | put_rpccred(entry->cred); | |
1833 | kfree(entry); | |
cfcea3e8 TM |
1834 | smp_mb__before_atomic_dec(); |
1835 | atomic_long_dec(&nfs_access_nr_entries); | |
1836 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1837 | } |
1838 | ||
1a81bb8a TM |
1839 | static void nfs_access_free_list(struct list_head *head) |
1840 | { | |
1841 | struct nfs_access_entry *cache; | |
1842 | ||
1843 | while (!list_empty(head)) { | |
1844 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1845 | list_del(&cache->lru); | |
1846 | nfs_access_free_entry(cache); | |
1847 | } | |
1848 | } | |
1849 | ||
7f8275d0 | 1850 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
1851 | { |
1852 | LIST_HEAD(head); | |
aa510da5 | 1853 | struct nfs_inode *nfsi, *next; |
979df72e TM |
1854 | struct nfs_access_entry *cache; |
1855 | ||
61d5eb29 TM |
1856 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1857 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1858 | |
a50f7951 | 1859 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1860 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1861 | struct inode *inode; |
1862 | ||
1863 | if (nr_to_scan-- == 0) | |
1864 | break; | |
9c7e7e23 | 1865 | inode = &nfsi->vfs_inode; |
979df72e TM |
1866 | spin_lock(&inode->i_lock); |
1867 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1868 | goto remove_lru_entry; | |
1869 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1870 | struct nfs_access_entry, lru); | |
1871 | list_move(&cache->lru, &head); | |
1872 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1873 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1874 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1875 | &nfs_access_lru_list); | |
1876 | else { | |
1877 | remove_lru_entry: | |
1878 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1879 | smp_mb__before_clear_bit(); |
979df72e | 1880 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1881 | smp_mb__after_clear_bit(); |
979df72e | 1882 | } |
59844a9b | 1883 | spin_unlock(&inode->i_lock); |
979df72e TM |
1884 | } |
1885 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1886 | nfs_access_free_list(&head); |
979df72e TM |
1887 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1888 | } | |
1889 | ||
1a81bb8a | 1890 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1891 | { |
1c3c07e9 | 1892 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1893 | struct rb_node *n; |
1c3c07e9 TM |
1894 | struct nfs_access_entry *entry; |
1895 | ||
1896 | /* Unhook entries from the cache */ | |
1897 | while ((n = rb_first(root_node)) != NULL) { | |
1898 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1899 | rb_erase(n, root_node); | |
1a81bb8a | 1900 | list_move(&entry->lru, head); |
1c3c07e9 TM |
1901 | } |
1902 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
1903 | } |
1904 | ||
1c3c07e9 | 1905 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1906 | { |
1a81bb8a TM |
1907 | LIST_HEAD(head); |
1908 | ||
1909 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
1910 | return; | |
cfcea3e8 | 1911 | /* Remove from global LRU init */ |
1a81bb8a TM |
1912 | spin_lock(&nfs_access_lru_lock); |
1913 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 1914 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 1915 | |
1c3c07e9 | 1916 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
1917 | __nfs_access_zap_cache(NFS_I(inode), &head); |
1918 | spin_unlock(&inode->i_lock); | |
1919 | spin_unlock(&nfs_access_lru_lock); | |
1920 | nfs_access_free_list(&head); | |
1c3c07e9 | 1921 | } |
1da177e4 | 1922 | |
1c3c07e9 TM |
1923 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
1924 | { | |
1925 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1926 | struct nfs_access_entry *entry; | |
1927 | ||
1928 | while (n != NULL) { | |
1929 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1930 | ||
1931 | if (cred < entry->cred) | |
1932 | n = n->rb_left; | |
1933 | else if (cred > entry->cred) | |
1934 | n = n->rb_right; | |
1935 | else | |
1936 | return entry; | |
1da177e4 | 1937 | } |
1c3c07e9 TM |
1938 | return NULL; |
1939 | } | |
1940 | ||
af22f94a | 1941 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
1942 | { |
1943 | struct nfs_inode *nfsi = NFS_I(inode); | |
1944 | struct nfs_access_entry *cache; | |
1945 | int err = -ENOENT; | |
1946 | ||
dc59250c | 1947 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
1948 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
1949 | goto out_zap; | |
1950 | cache = nfs_access_search_rbtree(inode, cred); | |
1951 | if (cache == NULL) | |
1952 | goto out; | |
b4d2314b | 1953 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 1954 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
1955 | goto out_stale; |
1956 | res->jiffies = cache->jiffies; | |
1957 | res->cred = cache->cred; | |
1958 | res->mask = cache->mask; | |
cfcea3e8 | 1959 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
1960 | err = 0; |
1961 | out: | |
1962 | spin_unlock(&inode->i_lock); | |
1963 | return err; | |
1964 | out_stale: | |
1965 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 1966 | list_del(&cache->lru); |
1c3c07e9 TM |
1967 | spin_unlock(&inode->i_lock); |
1968 | nfs_access_free_entry(cache); | |
1969 | return -ENOENT; | |
1970 | out_zap: | |
1a81bb8a TM |
1971 | spin_unlock(&inode->i_lock); |
1972 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
1973 | return -ENOENT; |
1974 | } | |
1975 | ||
1976 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
1977 | { | |
cfcea3e8 TM |
1978 | struct nfs_inode *nfsi = NFS_I(inode); |
1979 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
1980 | struct rb_node **p = &root_node->rb_node; |
1981 | struct rb_node *parent = NULL; | |
1982 | struct nfs_access_entry *entry; | |
1983 | ||
1984 | spin_lock(&inode->i_lock); | |
1985 | while (*p != NULL) { | |
1986 | parent = *p; | |
1987 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
1988 | ||
1989 | if (set->cred < entry->cred) | |
1990 | p = &parent->rb_left; | |
1991 | else if (set->cred > entry->cred) | |
1992 | p = &parent->rb_right; | |
1993 | else | |
1994 | goto found; | |
1995 | } | |
1996 | rb_link_node(&set->rb_node, parent, p); | |
1997 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 1998 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 1999 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2000 | return; |
2001 | found: | |
2002 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2003 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2004 | list_del(&entry->lru); | |
1c3c07e9 TM |
2005 | spin_unlock(&inode->i_lock); |
2006 | nfs_access_free_entry(entry); | |
2007 | } | |
2008 | ||
af22f94a | 2009 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2010 | { |
2011 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2012 | if (cache == NULL) | |
2013 | return; | |
2014 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2015 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2016 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2017 | cache->mask = set->mask; |
1c3c07e9 TM |
2018 | |
2019 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2020 | |
2021 | /* Update accounting */ | |
2022 | smp_mb__before_atomic_inc(); | |
2023 | atomic_long_inc(&nfs_access_nr_entries); | |
2024 | smp_mb__after_atomic_inc(); | |
2025 | ||
2026 | /* Add inode to global LRU list */ | |
1a81bb8a | 2027 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2028 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2029 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2030 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2031 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2032 | spin_unlock(&nfs_access_lru_lock); |
2033 | } | |
1da177e4 LT |
2034 | } |
2035 | ||
2036 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2037 | { | |
2038 | struct nfs_access_entry cache; | |
2039 | int status; | |
2040 | ||
2041 | status = nfs_access_get_cached(inode, cred, &cache); | |
2042 | if (status == 0) | |
2043 | goto out; | |
2044 | ||
2045 | /* Be clever: ask server to check for all possible rights */ | |
2046 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2047 | cache.cred = cred; | |
2048 | cache.jiffies = jiffies; | |
2049 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2050 | if (status != 0) { |
2051 | if (status == -ESTALE) { | |
2052 | nfs_zap_caches(inode); | |
2053 | if (!S_ISDIR(inode->i_mode)) | |
2054 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2055 | } | |
1da177e4 | 2056 | return status; |
a71ee337 | 2057 | } |
1da177e4 LT |
2058 | nfs_access_add_cache(inode, &cache); |
2059 | out: | |
e6305c43 | 2060 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2061 | return 0; |
2062 | return -EACCES; | |
2063 | } | |
2064 | ||
af22f94a TM |
2065 | static int nfs_open_permission_mask(int openflags) |
2066 | { | |
2067 | int mask = 0; | |
2068 | ||
2069 | if (openflags & FMODE_READ) | |
2070 | mask |= MAY_READ; | |
2071 | if (openflags & FMODE_WRITE) | |
2072 | mask |= MAY_WRITE; | |
2073 | if (openflags & FMODE_EXEC) | |
2074 | mask |= MAY_EXEC; | |
2075 | return mask; | |
2076 | } | |
2077 | ||
2078 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2079 | { | |
2080 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2081 | } | |
2082 | ||
e6305c43 | 2083 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2084 | { |
2085 | struct rpc_cred *cred; | |
2086 | int res = 0; | |
2087 | ||
91d5b470 CL |
2088 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2089 | ||
e6305c43 | 2090 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2091 | goto out; |
2092 | /* Is this sys_access() ? */ | |
9cfcac81 | 2093 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2094 | goto force_lookup; |
2095 | ||
2096 | switch (inode->i_mode & S_IFMT) { | |
2097 | case S_IFLNK: | |
2098 | goto out; | |
2099 | case S_IFREG: | |
2100 | /* NFSv4 has atomic_open... */ | |
2101 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2102 | && (mask & MAY_OPEN) |
2103 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2104 | goto out; |
2105 | break; | |
2106 | case S_IFDIR: | |
2107 | /* | |
2108 | * Optimize away all write operations, since the server | |
2109 | * will check permissions when we perform the op. | |
2110 | */ | |
2111 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2112 | goto out; | |
2113 | } | |
2114 | ||
2115 | force_lookup: | |
1da177e4 LT |
2116 | if (!NFS_PROTO(inode)->access) |
2117 | goto out_notsup; | |
2118 | ||
98a8e323 | 2119 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2120 | if (!IS_ERR(cred)) { |
2121 | res = nfs_do_access(inode, cred, mask); | |
2122 | put_rpccred(cred); | |
2123 | } else | |
2124 | res = PTR_ERR(cred); | |
1da177e4 | 2125 | out: |
f696a365 MS |
2126 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2127 | res = -EACCES; | |
2128 | ||
1e7cb3dc CL |
2129 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2130 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2131 | return res; |
2132 | out_notsup: | |
2133 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2134 | if (res == 0) | |
2135 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 2136 | goto out; |
1da177e4 LT |
2137 | } |
2138 | ||
2139 | /* | |
2140 | * Local variables: | |
2141 | * version-control: t | |
2142 | * kept-new-versions: 5 | |
2143 | * End: | |
2144 | */ |