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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> |
04e4bd1c | 36 | #include <linux/kmemleak.h> |
1da177e4 LT |
37 | |
38 | #include "delegation.h" | |
91d5b470 | 39 | #include "iostat.h" |
4c30d56e | 40 | #include "internal.h" |
cd9a1c0e | 41 | #include "fscache.h" |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* #define NFS_DEBUG_VERBOSE 1 */ |
44 | ||
45 | static int nfs_opendir(struct inode *, struct file *); | |
46 | static int nfs_readdir(struct file *, void *, filldir_t); | |
47 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
48 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
49 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
50 | static int nfs_rmdir(struct inode *, struct dentry *); | |
51 | static int nfs_unlink(struct inode *, struct dentry *); | |
52 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
53 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
54 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
55 | static int nfs_rename(struct inode *, struct dentry *, | |
56 | struct inode *, struct dentry *); | |
7ea80859 | 57 | static int nfs_fsync_dir(struct file *, int); |
f0dd2136 | 58 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 59 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 60 | |
4b6f5d20 | 61 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 62 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
63 | .read = generic_read_dir, |
64 | .readdir = nfs_readdir, | |
65 | .open = nfs_opendir, | |
66 | .release = nfs_release, | |
67 | .fsync = nfs_fsync_dir, | |
68 | }; | |
69 | ||
92e1d5be | 70 | const struct inode_operations nfs_dir_inode_operations = { |
1da177e4 LT |
71 | .create = nfs_create, |
72 | .lookup = nfs_lookup, | |
73 | .link = nfs_link, | |
74 | .unlink = nfs_unlink, | |
75 | .symlink = nfs_symlink, | |
76 | .mkdir = nfs_mkdir, | |
77 | .rmdir = nfs_rmdir, | |
78 | .mknod = nfs_mknod, | |
79 | .rename = nfs_rename, | |
80 | .permission = nfs_permission, | |
81 | .getattr = nfs_getattr, | |
82 | .setattr = nfs_setattr, | |
83 | }; | |
84 | ||
11de3b11 TM |
85 | const struct address_space_operations nfs_dir_aops = { |
86 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
87 | }; |
88 | ||
b7fa0554 | 89 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 90 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
91 | .create = nfs_create, |
92 | .lookup = nfs_lookup, | |
93 | .link = nfs_link, | |
94 | .unlink = nfs_unlink, | |
95 | .symlink = nfs_symlink, | |
96 | .mkdir = nfs_mkdir, | |
97 | .rmdir = nfs_rmdir, | |
98 | .mknod = nfs_mknod, | |
99 | .rename = nfs_rename, | |
100 | .permission = nfs_permission, | |
101 | .getattr = nfs_getattr, | |
102 | .setattr = nfs_setattr, | |
103 | .listxattr = nfs3_listxattr, | |
104 | .getxattr = nfs3_getxattr, | |
105 | .setxattr = nfs3_setxattr, | |
106 | .removexattr = nfs3_removexattr, | |
107 | }; | |
108 | #endif /* CONFIG_NFS_V3 */ | |
109 | ||
1da177e4 LT |
110 | #ifdef CONFIG_NFS_V4 |
111 | ||
112 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
c0204fd2 | 113 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd); |
92e1d5be | 114 | const struct inode_operations nfs4_dir_inode_operations = { |
c0204fd2 | 115 | .create = nfs_open_create, |
1da177e4 LT |
116 | .lookup = nfs_atomic_lookup, |
117 | .link = nfs_link, | |
118 | .unlink = nfs_unlink, | |
119 | .symlink = nfs_symlink, | |
120 | .mkdir = nfs_mkdir, | |
121 | .rmdir = nfs_rmdir, | |
122 | .mknod = nfs_mknod, | |
123 | .rename = nfs_rename, | |
124 | .permission = nfs_permission, | |
125 | .getattr = nfs_getattr, | |
126 | .setattr = nfs_setattr, | |
6b3b5496 BF |
127 | .getxattr = nfs4_getxattr, |
128 | .setxattr = nfs4_setxattr, | |
129 | .listxattr = nfs4_listxattr, | |
1da177e4 LT |
130 | }; |
131 | ||
132 | #endif /* CONFIG_NFS_V4 */ | |
133 | ||
134 | /* | |
135 | * Open file | |
136 | */ | |
137 | static int | |
138 | nfs_opendir(struct inode *inode, struct file *filp) | |
139 | { | |
7451c4f0 | 140 | int res; |
1da177e4 | 141 | |
6da24bc9 | 142 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
143 | filp->f_path.dentry->d_parent->d_name.name, |
144 | filp->f_path.dentry->d_name.name); | |
145 | ||
146 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 147 | |
1da177e4 | 148 | /* Call generic open code in order to cache credentials */ |
7451c4f0 | 149 | res = nfs_open(inode, filp); |
f5a73672 NB |
150 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
151 | /* This is a mountpoint, so d_revalidate will never | |
152 | * have been called, so we need to refresh the | |
153 | * inode (for close-open consistency) ourselves. | |
154 | */ | |
155 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
156 | } | |
1da177e4 LT |
157 | return res; |
158 | } | |
159 | ||
d1bacf9e BS |
160 | struct nfs_cache_array_entry { |
161 | u64 cookie; | |
162 | u64 ino; | |
163 | struct qstr string; | |
0b26a0bf | 164 | unsigned char d_type; |
d1bacf9e BS |
165 | }; |
166 | ||
167 | struct nfs_cache_array { | |
168 | unsigned int size; | |
169 | int eof_index; | |
170 | u64 last_cookie; | |
171 | struct nfs_cache_array_entry array[0]; | |
172 | }; | |
173 | ||
82f2e547 | 174 | typedef __be32 * (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int); |
1da177e4 LT |
175 | typedef struct { |
176 | struct file *file; | |
177 | struct page *page; | |
178 | unsigned long page_index; | |
f0dd2136 | 179 | u64 *dir_cookie; |
0aded708 | 180 | u64 last_cookie; |
f0dd2136 | 181 | loff_t current_index; |
1da177e4 | 182 | decode_dirent_t decode; |
d1bacf9e | 183 | |
1f4eab7e | 184 | unsigned long timestamp; |
4704f0e2 | 185 | unsigned long gencount; |
d1bacf9e BS |
186 | unsigned int cache_entry_index; |
187 | unsigned int plus:1; | |
188 | unsigned int eof:1; | |
1da177e4 LT |
189 | } nfs_readdir_descriptor_t; |
190 | ||
d1bacf9e BS |
191 | /* |
192 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
193 | */ |
194 | static | |
d1bacf9e BS |
195 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
196 | { | |
8cd51a0c | 197 | void *ptr; |
d1bacf9e BS |
198 | if (page == NULL) |
199 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
200 | ptr = kmap(page); |
201 | if (ptr == NULL) | |
202 | return ERR_PTR(-ENOMEM); | |
203 | return ptr; | |
d1bacf9e BS |
204 | } |
205 | ||
206 | static | |
207 | void nfs_readdir_release_array(struct page *page) | |
208 | { | |
209 | kunmap(page); | |
210 | } | |
211 | ||
212 | /* | |
213 | * we are freeing strings created by nfs_add_to_readdir_array() | |
214 | */ | |
215 | static | |
11de3b11 | 216 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 217 | { |
11de3b11 | 218 | struct nfs_cache_array *array; |
d1bacf9e | 219 | int i; |
8cd51a0c | 220 | |
11de3b11 | 221 | array = kmap_atomic(page, KM_USER0); |
d1bacf9e BS |
222 | for (i = 0; i < array->size; i++) |
223 | kfree(array->array[i].string.name); | |
11de3b11 | 224 | kunmap_atomic(array, KM_USER0); |
d1bacf9e BS |
225 | } |
226 | ||
227 | /* | |
228 | * the caller is responsible for freeing qstr.name | |
229 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
230 | * nfs_clear_readdir_array() | |
231 | */ | |
232 | static | |
4a201d6e | 233 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
234 | { |
235 | string->len = len; | |
236 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
237 | if (string->name == NULL) |
238 | return -ENOMEM; | |
04e4bd1c CM |
239 | /* |
240 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
241 | * in a page cache page which kmemleak does not scan. | |
242 | */ | |
243 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
244 | string->hash = full_name_hash(name, len); |
245 | return 0; | |
d1bacf9e BS |
246 | } |
247 | ||
248 | static | |
249 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
250 | { | |
251 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
252 | struct nfs_cache_array_entry *cache_entry; |
253 | int ret; | |
254 | ||
d1bacf9e BS |
255 | if (IS_ERR(array)) |
256 | return PTR_ERR(array); | |
3020093f TM |
257 | |
258 | cache_entry = &array->array[array->size]; | |
259 | ||
260 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 261 | ret = -ENOSPC; |
3020093f | 262 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 263 | goto out; |
d1bacf9e | 264 | |
4a201d6e TM |
265 | cache_entry->cookie = entry->prev_cookie; |
266 | cache_entry->ino = entry->ino; | |
0b26a0bf | 267 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
268 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
269 | if (ret) | |
270 | goto out; | |
d1bacf9e | 271 | array->last_cookie = entry->cookie; |
8cd51a0c | 272 | array->size++; |
47c716cb | 273 | if (entry->eof != 0) |
d1bacf9e | 274 | array->eof_index = array->size; |
4a201d6e | 275 | out: |
d1bacf9e | 276 | nfs_readdir_release_array(page); |
4a201d6e | 277 | return ret; |
d1bacf9e BS |
278 | } |
279 | ||
280 | static | |
281 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
282 | { | |
283 | loff_t diff = desc->file->f_pos - desc->current_index; | |
284 | unsigned int index; | |
285 | ||
286 | if (diff < 0) | |
287 | goto out_eof; | |
288 | if (diff >= array->size) { | |
8cd51a0c | 289 | if (array->eof_index >= 0) |
d1bacf9e BS |
290 | goto out_eof; |
291 | desc->current_index += array->size; | |
292 | return -EAGAIN; | |
293 | } | |
294 | ||
295 | index = (unsigned int)diff; | |
296 | *desc->dir_cookie = array->array[index].cookie; | |
297 | desc->cache_entry_index = index; | |
d1bacf9e BS |
298 | return 0; |
299 | out_eof: | |
300 | desc->eof = 1; | |
301 | return -EBADCOOKIE; | |
302 | } | |
303 | ||
304 | static | |
305 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
306 | { | |
307 | int i; | |
308 | int status = -EAGAIN; | |
309 | ||
310 | for (i = 0; i < array->size; i++) { | |
d1bacf9e BS |
311 | if (array->array[i].cookie == *desc->dir_cookie) { |
312 | desc->cache_entry_index = i; | |
47c716cb | 313 | return 0; |
d1bacf9e BS |
314 | } |
315 | } | |
47c716cb | 316 | if (array->eof_index >= 0) { |
8cd51a0c | 317 | status = -EBADCOOKIE; |
18fb5fe4 TM |
318 | if (*desc->dir_cookie == array->last_cookie) |
319 | desc->eof = 1; | |
8cd51a0c | 320 | } |
d1bacf9e BS |
321 | return status; |
322 | } | |
323 | ||
324 | static | |
325 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
326 | { | |
327 | struct nfs_cache_array *array; | |
47c716cb | 328 | int status; |
d1bacf9e BS |
329 | |
330 | array = nfs_readdir_get_array(desc->page); | |
331 | if (IS_ERR(array)) { | |
332 | status = PTR_ERR(array); | |
333 | goto out; | |
334 | } | |
335 | ||
336 | if (*desc->dir_cookie == 0) | |
337 | status = nfs_readdir_search_for_pos(array, desc); | |
338 | else | |
339 | status = nfs_readdir_search_for_cookie(array, desc); | |
340 | ||
47c716cb | 341 | if (status == -EAGAIN) { |
0aded708 | 342 | desc->last_cookie = array->last_cookie; |
47c716cb TM |
343 | desc->page_index++; |
344 | } | |
d1bacf9e BS |
345 | nfs_readdir_release_array(desc->page); |
346 | out: | |
347 | return status; | |
348 | } | |
349 | ||
350 | /* Fill a page with xdr information before transferring to the cache page */ | |
351 | static | |
56e4ebf8 | 352 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 353 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 354 | { |
1da177e4 | 355 | struct rpc_cred *cred = nfs_file_cred(file); |
4704f0e2 | 356 | unsigned long timestamp, gencount; |
1da177e4 LT |
357 | int error; |
358 | ||
1da177e4 LT |
359 | again: |
360 | timestamp = jiffies; | |
4704f0e2 | 361 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 362 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
363 | NFS_SERVER(inode)->dtsize, desc->plus); |
364 | if (error < 0) { | |
365 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
366 | if (error == -ENOTSUPP && desc->plus) { | |
367 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 368 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
369 | desc->plus = 0; |
370 | goto again; | |
371 | } | |
372 | goto error; | |
373 | } | |
1f4eab7e | 374 | desc->timestamp = timestamp; |
4704f0e2 | 375 | desc->gencount = gencount; |
d1bacf9e BS |
376 | error: |
377 | return error; | |
1da177e4 LT |
378 | } |
379 | ||
d1bacf9e BS |
380 | /* Fill in an entry based on the xdr code stored in desc->page */ |
381 | static | |
babddc72 | 382 | int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, struct xdr_stream *stream) |
1da177e4 | 383 | { |
82f2e547 | 384 | __be32 *p = desc->decode(stream, entry, NFS_SERVER(desc->file->f_path.dentry->d_inode), desc->plus); |
1da177e4 LT |
385 | if (IS_ERR(p)) |
386 | return PTR_ERR(p); | |
1da177e4 | 387 | |
d1bacf9e BS |
388 | entry->fattr->time_start = desc->timestamp; |
389 | entry->fattr->gencount = desc->gencount; | |
390 | return 0; | |
1da177e4 LT |
391 | } |
392 | ||
d39ab9de BS |
393 | static |
394 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
395 | { | |
d39ab9de BS |
396 | if (dentry->d_inode == NULL) |
397 | goto different; | |
37a09f07 | 398 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
399 | goto different; |
400 | return 1; | |
401 | different: | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static | |
406 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
407 | { | |
4a201d6e TM |
408 | struct qstr filename = { |
409 | .len = entry->len, | |
410 | .name = entry->name, | |
411 | }; | |
412 | struct dentry *dentry; | |
413 | struct dentry *alias; | |
d39ab9de BS |
414 | struct inode *dir = parent->d_inode; |
415 | struct inode *inode; | |
416 | ||
4a201d6e TM |
417 | if (filename.name[0] == '.') { |
418 | if (filename.len == 1) | |
419 | return; | |
420 | if (filename.len == 2 && filename.name[1] == '.') | |
421 | return; | |
422 | } | |
423 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 424 | |
4a201d6e | 425 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
426 | if (dentry != NULL) { |
427 | if (nfs_same_file(dentry, entry)) { | |
428 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
429 | goto out; | |
430 | } else { | |
431 | d_drop(dentry); | |
432 | dput(dentry); | |
433 | } | |
434 | } | |
435 | ||
436 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
437 | if (dentry == NULL) |
438 | return; | |
439 | ||
d39ab9de BS |
440 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
441 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
442 | if (IS_ERR(inode)) | |
443 | goto out; | |
444 | ||
445 | alias = d_materialise_unique(dentry, inode); | |
446 | if (IS_ERR(alias)) | |
447 | goto out; | |
448 | else if (alias) { | |
449 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
450 | dput(alias); | |
451 | } else | |
452 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
453 | ||
454 | out: | |
455 | dput(dentry); | |
d39ab9de BS |
456 | } |
457 | ||
d1bacf9e BS |
458 | /* Perform conversion from xdr to cache array */ |
459 | static | |
8cd51a0c | 460 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 461 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 462 | { |
babddc72 | 463 | struct xdr_stream stream; |
6650239a TM |
464 | struct xdr_buf buf = { |
465 | .pages = xdr_pages, | |
466 | .page_len = buflen, | |
467 | .buflen = buflen, | |
468 | .len = buflen, | |
469 | }; | |
470 | struct page *scratch; | |
99424380 | 471 | struct nfs_cache_array *array; |
5c346854 TM |
472 | unsigned int count = 0; |
473 | int status; | |
babddc72 | 474 | |
6650239a TM |
475 | scratch = alloc_page(GFP_KERNEL); |
476 | if (scratch == NULL) | |
477 | return -ENOMEM; | |
babddc72 | 478 | |
6650239a TM |
479 | xdr_init_decode(&stream, &buf, NULL); |
480 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); | |
99424380 BS |
481 | |
482 | do { | |
483 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
484 | if (status != 0) { |
485 | if (status == -EAGAIN) | |
486 | status = 0; | |
99424380 | 487 | break; |
8cd51a0c | 488 | } |
99424380 | 489 | |
5c346854 TM |
490 | count++; |
491 | ||
47c716cb | 492 | if (desc->plus != 0) |
d39ab9de | 493 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
494 | |
495 | status = nfs_readdir_add_to_array(entry, page); | |
496 | if (status != 0) | |
497 | break; | |
99424380 BS |
498 | } while (!entry->eof); |
499 | ||
47c716cb | 500 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 501 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
502 | if (!IS_ERR(array)) { |
503 | array->eof_index = array->size; | |
504 | status = 0; | |
505 | nfs_readdir_release_array(page); | |
5c346854 TM |
506 | } else |
507 | status = PTR_ERR(array); | |
1da177e4 | 508 | } |
6650239a TM |
509 | |
510 | put_page(scratch); | |
8cd51a0c | 511 | return status; |
56e4ebf8 BS |
512 | } |
513 | ||
514 | static | |
515 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
516 | { | |
517 | unsigned int i; | |
518 | for (i = 0; i < npages; i++) | |
519 | put_page(pages[i]); | |
520 | } | |
521 | ||
522 | static | |
523 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
524 | unsigned int npages) | |
525 | { | |
56e4ebf8 BS |
526 | nfs_readdir_free_pagearray(pages, npages); |
527 | } | |
528 | ||
529 | /* | |
530 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
531 | * to nfs_readdir_free_large_page | |
532 | */ | |
533 | static | |
6650239a | 534 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 535 | { |
56e4ebf8 BS |
536 | unsigned int i; |
537 | ||
538 | for (i = 0; i < npages; i++) { | |
539 | struct page *page = alloc_page(GFP_KERNEL); | |
540 | if (page == NULL) | |
541 | goto out_freepages; | |
542 | pages[i] = page; | |
543 | } | |
6650239a | 544 | return 0; |
56e4ebf8 | 545 | |
56e4ebf8 BS |
546 | out_freepages: |
547 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 548 | return -ENOMEM; |
1da177e4 LT |
549 | } |
550 | ||
d1bacf9e BS |
551 | static |
552 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 553 | { |
56e4ebf8 BS |
554 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
555 | void *pages_ptr = NULL; | |
d1bacf9e BS |
556 | struct nfs_entry entry; |
557 | struct file *file = desc->file; | |
558 | struct nfs_cache_array *array; | |
8cd51a0c | 559 | int status = -ENOMEM; |
56e4ebf8 | 560 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
561 | |
562 | entry.prev_cookie = 0; | |
0aded708 | 563 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
564 | entry.eof = 0; |
565 | entry.fh = nfs_alloc_fhandle(); | |
566 | entry.fattr = nfs_alloc_fattr(); | |
567 | if (entry.fh == NULL || entry.fattr == NULL) | |
568 | goto out; | |
00a92642 | 569 | |
d1bacf9e | 570 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
571 | if (IS_ERR(array)) { |
572 | status = PTR_ERR(array); | |
573 | goto out; | |
574 | } | |
d1bacf9e BS |
575 | memset(array, 0, sizeof(struct nfs_cache_array)); |
576 | array->eof_index = -1; | |
00a92642 | 577 | |
6650239a TM |
578 | status = nfs_readdir_large_page(pages, array_size); |
579 | if (status < 0) | |
d1bacf9e BS |
580 | goto out_release_array; |
581 | do { | |
ac396128 | 582 | unsigned int pglen; |
56e4ebf8 | 583 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 584 | |
d1bacf9e | 585 | if (status < 0) |
00a92642 | 586 | break; |
ac396128 | 587 | pglen = status; |
6650239a | 588 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
589 | if (status < 0) { |
590 | if (status == -ENOSPC) | |
591 | status = 0; | |
592 | break; | |
593 | } | |
594 | } while (array->eof_index < 0); | |
d1bacf9e | 595 | |
56e4ebf8 | 596 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
597 | out_release_array: |
598 | nfs_readdir_release_array(page); | |
599 | out: | |
600 | nfs_free_fattr(entry.fattr); | |
601 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
602 | return status; |
603 | } | |
604 | ||
605 | /* | |
d1bacf9e BS |
606 | * Now we cache directories properly, by converting xdr information |
607 | * to an array that can be used for lookups later. This results in | |
608 | * fewer cache pages, since we can store more information on each page. | |
609 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 610 | */ |
d1bacf9e BS |
611 | static |
612 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 613 | { |
01cce933 | 614 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 615 | int ret; |
1da177e4 | 616 | |
8cd51a0c TM |
617 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
618 | if (ret < 0) | |
d1bacf9e BS |
619 | goto error; |
620 | SetPageUptodate(page); | |
1da177e4 | 621 | |
d1bacf9e BS |
622 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
623 | /* Should never happen */ | |
624 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 625 | } |
d1bacf9e BS |
626 | unlock_page(page); |
627 | return 0; | |
628 | error: | |
629 | unlock_page(page); | |
8cd51a0c | 630 | return ret; |
d1bacf9e | 631 | } |
1da177e4 | 632 | |
d1bacf9e BS |
633 | static |
634 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
635 | { | |
11de3b11 TM |
636 | if (!desc->page->mapping) |
637 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
638 | page_cache_release(desc->page); |
639 | desc->page = NULL; | |
640 | } | |
641 | ||
642 | static | |
643 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
644 | { | |
8cd51a0c | 645 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 646 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
647 | } |
648 | ||
649 | /* | |
d1bacf9e | 650 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 651 | */ |
d1bacf9e BS |
652 | static |
653 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
654 | { | |
655 | int res; | |
656 | ||
657 | desc->page = get_cache_page(desc); | |
658 | if (IS_ERR(desc->page)) | |
659 | return PTR_ERR(desc->page); | |
660 | ||
661 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
662 | if (res != 0) |
663 | cache_page_release(desc); | |
d1bacf9e BS |
664 | return res; |
665 | } | |
666 | ||
667 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
668 | static inline |
669 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
670 | { | |
8cd51a0c | 671 | int res; |
d1bacf9e | 672 | |
0aded708 | 673 | if (desc->page_index == 0) { |
8cd51a0c | 674 | desc->current_index = 0; |
0aded708 TM |
675 | desc->last_cookie = 0; |
676 | } | |
47c716cb | 677 | do { |
d1bacf9e | 678 | res = find_cache_page(desc); |
47c716cb | 679 | } while (res == -EAGAIN); |
1da177e4 LT |
680 | return res; |
681 | } | |
682 | ||
1da177e4 LT |
683 | /* |
684 | * Once we've found the start of the dirent within a page: fill 'er up... | |
685 | */ | |
686 | static | |
687 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
688 | filldir_t filldir) | |
689 | { | |
690 | struct file *file = desc->file; | |
d1bacf9e BS |
691 | int i = 0; |
692 | int res = 0; | |
693 | struct nfs_cache_array *array = NULL; | |
d1bacf9e BS |
694 | |
695 | array = nfs_readdir_get_array(desc->page); | |
e7c58e97 TM |
696 | if (IS_ERR(array)) { |
697 | res = PTR_ERR(array); | |
698 | goto out; | |
699 | } | |
d1bacf9e BS |
700 | |
701 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 702 | struct nfs_cache_array_entry *ent; |
1da177e4 | 703 | |
ece0b423 TM |
704 | ent = &array->array[i]; |
705 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
706 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
707 | ent->d_type) < 0) { | |
ece0b423 | 708 | desc->eof = 1; |
1da177e4 | 709 | break; |
ece0b423 | 710 | } |
00a92642 | 711 | file->f_pos++; |
d1bacf9e BS |
712 | if (i < (array->size-1)) |
713 | *desc->dir_cookie = array->array[i+1].cookie; | |
714 | else | |
715 | *desc->dir_cookie = array->last_cookie; | |
1da177e4 | 716 | } |
47c716cb | 717 | if (array->eof_index >= 0) |
8cd51a0c | 718 | desc->eof = 1; |
d1bacf9e BS |
719 | |
720 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 721 | out: |
d1bacf9e | 722 | cache_page_release(desc); |
1e7cb3dc CL |
723 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
724 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
725 | return res; |
726 | } | |
727 | ||
728 | /* | |
729 | * If we cannot find a cookie in our cache, we suspect that this is | |
730 | * because it points to a deleted file, so we ask the server to return | |
731 | * whatever it thinks is the next entry. We then feed this to filldir. | |
732 | * If all goes well, we should then be able to find our way round the | |
733 | * cache on the next call to readdir_search_pagecache(); | |
734 | * | |
735 | * NOTE: we cannot add the anonymous page to the pagecache because | |
736 | * the data it contains might not be page aligned. Besides, | |
737 | * we should already have a complete representation of the | |
738 | * directory in the page cache by the time we get here. | |
739 | */ | |
740 | static inline | |
741 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
742 | filldir_t filldir) | |
743 | { | |
1da177e4 LT |
744 | struct page *page = NULL; |
745 | int status; | |
d1bacf9e | 746 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 747 | |
1e7cb3dc CL |
748 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
749 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
750 | |
751 | page = alloc_page(GFP_HIGHUSER); | |
752 | if (!page) { | |
753 | status = -ENOMEM; | |
754 | goto out; | |
755 | } | |
d1bacf9e | 756 | |
7a8e1dc3 | 757 | desc->page_index = 0; |
0aded708 | 758 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 TM |
759 | desc->page = page; |
760 | ||
85f8607e TM |
761 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
762 | if (status < 0) | |
1da177e4 LT |
763 | goto out_release; |
764 | ||
765 | status = nfs_do_filldir(desc, dirent, filldir); | |
766 | ||
1da177e4 | 767 | out: |
1e7cb3dc | 768 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 769 | __func__, status); |
1da177e4 LT |
770 | return status; |
771 | out_release: | |
d1bacf9e | 772 | cache_page_release(desc); |
1da177e4 LT |
773 | goto out; |
774 | } | |
775 | ||
00a92642 OG |
776 | /* The file offset position represents the dirent entry number. A |
777 | last cookie cache takes care of the common case of reading the | |
778 | whole directory. | |
1da177e4 LT |
779 | */ |
780 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
781 | { | |
01cce933 | 782 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
783 | struct inode *inode = dentry->d_inode; |
784 | nfs_readdir_descriptor_t my_desc, | |
785 | *desc = &my_desc; | |
47c716cb | 786 | int res; |
1da177e4 | 787 | |
6da24bc9 | 788 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
789 | dentry->d_parent->d_name.name, dentry->d_name.name, |
790 | (long long)filp->f_pos); | |
91d5b470 CL |
791 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
792 | ||
1da177e4 | 793 | /* |
00a92642 | 794 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 795 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
796 | * to either find the entry with the appropriate number or |
797 | * revalidate the cookie. | |
1da177e4 LT |
798 | */ |
799 | memset(desc, 0, sizeof(*desc)); | |
800 | ||
801 | desc->file = filp; | |
cd3758e3 | 802 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
803 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
804 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
805 | ||
565277f6 | 806 | nfs_block_sillyrename(dentry); |
1cda707d | 807 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
808 | if (res < 0) |
809 | goto out; | |
810 | ||
47c716cb | 811 | do { |
1da177e4 | 812 | res = readdir_search_pagecache(desc); |
00a92642 | 813 | |
1da177e4 | 814 | if (res == -EBADCOOKIE) { |
ece0b423 | 815 | res = 0; |
1da177e4 | 816 | /* This means either end of directory */ |
d1bacf9e | 817 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
818 | /* Or that the server has 'lost' a cookie */ |
819 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 820 | if (res == 0) |
1da177e4 LT |
821 | continue; |
822 | } | |
1da177e4 LT |
823 | break; |
824 | } | |
825 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 826 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 827 | nfs_zap_caches(inode); |
baf57a09 | 828 | desc->page_index = 0; |
1da177e4 | 829 | desc->plus = 0; |
d1bacf9e | 830 | desc->eof = 0; |
1da177e4 LT |
831 | continue; |
832 | } | |
833 | if (res < 0) | |
834 | break; | |
835 | ||
836 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 837 | if (res < 0) |
1da177e4 | 838 | break; |
47c716cb | 839 | } while (!desc->eof); |
fccca7fc | 840 | out: |
565277f6 | 841 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
842 | if (res > 0) |
843 | res = 0; | |
aa49b4cf | 844 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
845 | dentry->d_parent->d_name.name, dentry->d_name.name, |
846 | res); | |
847 | return res; | |
1da177e4 LT |
848 | } |
849 | ||
10afec90 | 850 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 851 | { |
b84e06c5 CL |
852 | struct dentry *dentry = filp->f_path.dentry; |
853 | struct inode *inode = dentry->d_inode; | |
854 | ||
6da24bc9 | 855 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
856 | dentry->d_parent->d_name.name, |
857 | dentry->d_name.name, | |
858 | offset, origin); | |
859 | ||
860 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
861 | switch (origin) { |
862 | case 1: | |
863 | offset += filp->f_pos; | |
864 | case 0: | |
865 | if (offset >= 0) | |
866 | break; | |
867 | default: | |
868 | offset = -EINVAL; | |
869 | goto out; | |
870 | } | |
871 | if (offset != filp->f_pos) { | |
872 | filp->f_pos = offset; | |
cd3758e3 | 873 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
874 | } |
875 | out: | |
b84e06c5 | 876 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
877 | return offset; |
878 | } | |
879 | ||
1da177e4 LT |
880 | /* |
881 | * All directory operations under NFS are synchronous, so fsync() | |
882 | * is a dummy operation. | |
883 | */ | |
7ea80859 | 884 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 885 | { |
7ea80859 CH |
886 | struct dentry *dentry = filp->f_path.dentry; |
887 | ||
6da24bc9 | 888 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
889 | dentry->d_parent->d_name.name, dentry->d_name.name, |
890 | datasync); | |
891 | ||
54917786 | 892 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
893 | return 0; |
894 | } | |
895 | ||
bfc69a45 TM |
896 | /** |
897 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
898 | * @dir - pointer to directory inode | |
899 | * | |
900 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
901 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
902 | * on the server that might have invalidated our dcache. | |
903 | * | |
904 | * The caller should be holding dir->i_lock | |
905 | */ | |
906 | void nfs_force_lookup_revalidate(struct inode *dir) | |
907 | { | |
011935a0 | 908 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
909 | } |
910 | ||
1da177e4 LT |
911 | /* |
912 | * A check for whether or not the parent directory has changed. | |
913 | * In the case it has, we assume that the dentries are untrustworthy | |
914 | * and may need to be looked up again. | |
915 | */ | |
c79ba787 | 916 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
917 | { |
918 | if (IS_ROOT(dentry)) | |
919 | return 1; | |
4eec952e TM |
920 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
921 | return 0; | |
f2c77f4e TM |
922 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
923 | return 0; | |
924 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
925 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
926 | return 0; | |
927 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
928 | return 0; | |
929 | return 1; | |
1da177e4 LT |
930 | } |
931 | ||
1d6757fb TM |
932 | /* |
933 | * Return the intent data that applies to this particular path component | |
934 | * | |
935 | * Note that the current set of intents only apply to the very last | |
936 | * component of the path. | |
937 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
938 | */ | |
939 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
940 | { | |
941 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
942 | return 0; | |
943 | return nd->flags & mask; | |
944 | } | |
945 | ||
a12802ca TM |
946 | /* |
947 | * Use intent information to check whether or not we're going to do | |
948 | * an O_EXCL create using this path component. | |
949 | */ | |
950 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
951 | { | |
952 | if (NFS_PROTO(dir)->version == 2) | |
953 | return 0; | |
3516586a | 954 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
955 | } |
956 | ||
1d6757fb TM |
957 | /* |
958 | * Inode and filehandle revalidation for lookups. | |
959 | * | |
960 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
961 | * or if the intent information indicates that we're about to open this | |
962 | * particular file and the "nocto" mount flag is not set. | |
963 | * | |
964 | */ | |
1da177e4 LT |
965 | static inline |
966 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
967 | { | |
968 | struct nfs_server *server = NFS_SERVER(inode); | |
969 | ||
4e99a1ff TM |
970 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
971 | return 0; | |
1da177e4 | 972 | if (nd != NULL) { |
1da177e4 | 973 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 974 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
975 | goto out_force; |
976 | /* This is an open(2) */ | |
1d6757fb | 977 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
978 | !(server->flags & NFS_MOUNT_NOCTO) && |
979 | (S_ISREG(inode->i_mode) || | |
980 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 981 | goto out_force; |
4f48af45 | 982 | return 0; |
1da177e4 LT |
983 | } |
984 | return nfs_revalidate_inode(server, inode); | |
985 | out_force: | |
986 | return __nfs_revalidate_inode(server, inode); | |
987 | } | |
988 | ||
989 | /* | |
990 | * We judge how long we want to trust negative | |
991 | * dentries by looking at the parent inode mtime. | |
992 | * | |
993 | * If parent mtime has changed, we revalidate, else we wait for a | |
994 | * period corresponding to the parent's attribute cache timeout value. | |
995 | */ | |
996 | static inline | |
997 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
998 | struct nameidata *nd) | |
999 | { | |
1da177e4 | 1000 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 1001 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1002 | return 0; |
4eec952e TM |
1003 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1004 | return 1; | |
1da177e4 LT |
1005 | return !nfs_check_verifier(dir, dentry); |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * This is called every time the dcache has a lookup hit, | |
1010 | * and we should check whether we can really trust that | |
1011 | * lookup. | |
1012 | * | |
1013 | * NOTE! The hit can be a negative hit too, don't assume | |
1014 | * we have an inode! | |
1015 | * | |
1016 | * If the parent directory is seen to have changed, we throw out the | |
1017 | * cached dentry and do a new lookup. | |
1018 | */ | |
1019 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
1020 | { | |
1021 | struct inode *dir; | |
1022 | struct inode *inode; | |
1023 | struct dentry *parent; | |
e1fb4d05 TM |
1024 | struct nfs_fh *fhandle = NULL; |
1025 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1026 | int error; |
1da177e4 LT |
1027 | |
1028 | parent = dget_parent(dentry); | |
1da177e4 | 1029 | dir = parent->d_inode; |
91d5b470 | 1030 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1031 | inode = dentry->d_inode; |
1032 | ||
1033 | if (!inode) { | |
1034 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1035 | goto out_bad; | |
1036 | goto out_valid; | |
1037 | } | |
1038 | ||
1039 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1040 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1041 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1042 | dentry->d_name.name); |
1da177e4 LT |
1043 | goto out_bad; |
1044 | } | |
1045 | ||
15860ab1 TM |
1046 | if (nfs_have_delegation(inode, FMODE_READ)) |
1047 | goto out_set_verifier; | |
1048 | ||
1da177e4 | 1049 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1050 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1051 | if (nfs_lookup_verify_inode(inode, nd)) |
1052 | goto out_zap_parent; | |
1053 | goto out_valid; | |
1054 | } | |
1055 | ||
1056 | if (NFS_STALE(inode)) | |
1057 | goto out_bad; | |
1058 | ||
e1fb4d05 TM |
1059 | error = -ENOMEM; |
1060 | fhandle = nfs_alloc_fhandle(); | |
1061 | fattr = nfs_alloc_fattr(); | |
1062 | if (fhandle == NULL || fattr == NULL) | |
1063 | goto out_error; | |
1064 | ||
1065 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1da177e4 LT |
1066 | if (error) |
1067 | goto out_bad; | |
e1fb4d05 | 1068 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1069 | goto out_bad; |
e1fb4d05 | 1070 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1071 | goto out_bad; |
1072 | ||
e1fb4d05 TM |
1073 | nfs_free_fattr(fattr); |
1074 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1075 | out_set_verifier: |
cf8ba45e | 1076 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1077 | out_valid: |
1da177e4 | 1078 | dput(parent); |
1e7cb3dc | 1079 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1080 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1081 | dentry->d_name.name); |
1da177e4 LT |
1082 | return 1; |
1083 | out_zap_parent: | |
1084 | nfs_zap_caches(dir); | |
1085 | out_bad: | |
a1643a92 | 1086 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1087 | if (inode && S_ISDIR(inode->i_mode)) { |
1088 | /* Purge readdir caches. */ | |
1089 | nfs_zap_caches(inode); | |
1090 | /* If we have submounts, don't unhash ! */ | |
1091 | if (have_submounts(dentry)) | |
1092 | goto out_valid; | |
d9e80b7d AV |
1093 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1094 | goto out_valid; | |
1da177e4 LT |
1095 | shrink_dcache_parent(dentry); |
1096 | } | |
1097 | d_drop(dentry); | |
e1fb4d05 TM |
1098 | nfs_free_fattr(fattr); |
1099 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1100 | dput(parent); |
1e7cb3dc | 1101 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1102 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1103 | dentry->d_name.name); |
1da177e4 | 1104 | return 0; |
e1fb4d05 TM |
1105 | out_error: |
1106 | nfs_free_fattr(fattr); | |
1107 | nfs_free_fhandle(fhandle); | |
1108 | dput(parent); | |
1109 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1110 | __func__, dentry->d_parent->d_name.name, | |
1111 | dentry->d_name.name, error); | |
1112 | return error; | |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | /* | |
1116 | * This is called from dput() when d_count is going to 0. | |
1117 | */ | |
1118 | static int nfs_dentry_delete(struct dentry *dentry) | |
1119 | { | |
1120 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1121 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1122 | dentry->d_flags); | |
1123 | ||
77f11192 TM |
1124 | /* Unhash any dentry with a stale inode */ |
1125 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1126 | return 1; | |
1127 | ||
1da177e4 LT |
1128 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1129 | /* Unhash it, so that ->d_iput() would be called */ | |
1130 | return 1; | |
1131 | } | |
1132 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1133 | /* Unhash it, so that ancestors of killed async unlink | |
1134 | * files will be cleaned up during umount */ | |
1135 | return 1; | |
1136 | } | |
1137 | return 0; | |
1138 | ||
1139 | } | |
1140 | ||
1b83d707 TM |
1141 | static void nfs_drop_nlink(struct inode *inode) |
1142 | { | |
1143 | spin_lock(&inode->i_lock); | |
1144 | if (inode->i_nlink > 0) | |
1145 | drop_nlink(inode); | |
1146 | spin_unlock(&inode->i_lock); | |
1147 | } | |
1148 | ||
1da177e4 LT |
1149 | /* |
1150 | * Called when the dentry loses inode. | |
1151 | * We use it to clean up silly-renamed files. | |
1152 | */ | |
1153 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1154 | { | |
83672d39 NB |
1155 | if (S_ISDIR(inode->i_mode)) |
1156 | /* drop any readdir cache as it could easily be old */ | |
1157 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1158 | ||
1da177e4 | 1159 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1160 | drop_nlink(inode); |
e4eff1a6 | 1161 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1162 | } |
1da177e4 LT |
1163 | iput(inode); |
1164 | } | |
1165 | ||
f786aa90 | 1166 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1167 | .d_revalidate = nfs_lookup_revalidate, |
1168 | .d_delete = nfs_dentry_delete, | |
1169 | .d_iput = nfs_dentry_iput, | |
1170 | }; | |
1171 | ||
1da177e4 LT |
1172 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1173 | { | |
1174 | struct dentry *res; | |
565277f6 | 1175 | struct dentry *parent; |
1da177e4 | 1176 | struct inode *inode = NULL; |
e1fb4d05 TM |
1177 | struct nfs_fh *fhandle = NULL; |
1178 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1179 | int error; |
1da177e4 LT |
1180 | |
1181 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1182 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1183 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1184 | |
1185 | res = ERR_PTR(-ENAMETOOLONG); | |
1186 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1187 | goto out; | |
1188 | ||
1da177e4 LT |
1189 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
1190 | ||
fd684071 TM |
1191 | /* |
1192 | * If we're doing an exclusive create, optimize away the lookup | |
1193 | * but don't hash the dentry. | |
1194 | */ | |
1195 | if (nfs_is_exclusive_create(dir, nd)) { | |
1196 | d_instantiate(dentry, NULL); | |
1197 | res = NULL; | |
fc0f684c | 1198 | goto out; |
fd684071 | 1199 | } |
1da177e4 | 1200 | |
e1fb4d05 TM |
1201 | res = ERR_PTR(-ENOMEM); |
1202 | fhandle = nfs_alloc_fhandle(); | |
1203 | fattr = nfs_alloc_fattr(); | |
1204 | if (fhandle == NULL || fattr == NULL) | |
1205 | goto out; | |
1206 | ||
565277f6 TM |
1207 | parent = dentry->d_parent; |
1208 | /* Protect against concurrent sillydeletes */ | |
1209 | nfs_block_sillyrename(parent); | |
e1fb4d05 | 1210 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1211 | if (error == -ENOENT) |
1212 | goto no_entry; | |
1213 | if (error < 0) { | |
1214 | res = ERR_PTR(error); | |
565277f6 | 1215 | goto out_unblock_sillyrename; |
1da177e4 | 1216 | } |
e1fb4d05 | 1217 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1218 | res = (struct dentry *)inode; |
1219 | if (IS_ERR(res)) | |
565277f6 | 1220 | goto out_unblock_sillyrename; |
54ceac45 | 1221 | |
1da177e4 | 1222 | no_entry: |
54ceac45 | 1223 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1224 | if (res != NULL) { |
1225 | if (IS_ERR(res)) | |
565277f6 | 1226 | goto out_unblock_sillyrename; |
1da177e4 | 1227 | dentry = res; |
9eaef27b | 1228 | } |
1da177e4 | 1229 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1230 | out_unblock_sillyrename: |
1231 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1232 | out: |
e1fb4d05 TM |
1233 | nfs_free_fattr(fattr); |
1234 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1235 | return res; |
1236 | } | |
1237 | ||
1238 | #ifdef CONFIG_NFS_V4 | |
1239 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1240 | ||
f786aa90 | 1241 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1242 | .d_revalidate = nfs_open_revalidate, |
1243 | .d_delete = nfs_dentry_delete, | |
1244 | .d_iput = nfs_dentry_iput, | |
1245 | }; | |
1246 | ||
1d6757fb TM |
1247 | /* |
1248 | * Use intent information to determine whether we need to substitute | |
1249 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1250 | */ | |
5584c306 | 1251 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1252 | { |
1d6757fb | 1253 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1254 | return 0; |
1255 | /* NFS does not (yet) have a stateful open for directories */ | |
1256 | if (nd->flags & LOOKUP_DIRECTORY) | |
1257 | return 0; | |
1258 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1259 | if (__mnt_is_readonly(nd->path.mnt) && |
1260 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1261 | return 0; |
1262 | return 1; | |
1263 | } | |
1264 | ||
cd9a1c0e TM |
1265 | static struct nfs_open_context *nameidata_to_nfs_open_context(struct dentry *dentry, struct nameidata *nd) |
1266 | { | |
1267 | struct path path = { | |
1268 | .mnt = nd->path.mnt, | |
1269 | .dentry = dentry, | |
1270 | }; | |
1271 | struct nfs_open_context *ctx; | |
1272 | struct rpc_cred *cred; | |
1273 | fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC); | |
1274 | ||
1275 | cred = rpc_lookup_cred(); | |
1276 | if (IS_ERR(cred)) | |
1277 | return ERR_CAST(cred); | |
1278 | ctx = alloc_nfs_open_context(&path, cred, fmode); | |
1279 | put_rpccred(cred); | |
1280 | if (ctx == NULL) | |
1281 | return ERR_PTR(-ENOMEM); | |
1282 | return ctx; | |
1283 | } | |
1284 | ||
1285 | static int do_open(struct inode *inode, struct file *filp) | |
1286 | { | |
1287 | nfs_fscache_set_inode_cookie(inode, filp); | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1292 | { | |
1293 | struct file *filp; | |
1294 | int ret = 0; | |
1295 | ||
1296 | /* If the open_intent is for execute, we have an extra check to make */ | |
1297 | if (ctx->mode & FMODE_EXEC) { | |
1298 | ret = nfs_may_open(ctx->path.dentry->d_inode, | |
1299 | ctx->cred, | |
1300 | nd->intent.open.flags); | |
1301 | if (ret < 0) | |
1302 | goto out; | |
1303 | } | |
1304 | filp = lookup_instantiate_filp(nd, ctx->path.dentry, do_open); | |
1305 | if (IS_ERR(filp)) | |
1306 | ret = PTR_ERR(filp); | |
1307 | else | |
1308 | nfs_file_set_open_context(filp, ctx); | |
1309 | out: | |
1310 | put_nfs_open_context(ctx); | |
1311 | return ret; | |
1312 | } | |
1313 | ||
1da177e4 LT |
1314 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1315 | { | |
cd9a1c0e TM |
1316 | struct nfs_open_context *ctx; |
1317 | struct iattr attr; | |
1da177e4 | 1318 | struct dentry *res = NULL; |
f46e0bd3 | 1319 | struct inode *inode; |
cd9a1c0e | 1320 | int open_flags; |
898f635c | 1321 | int err; |
1da177e4 | 1322 | |
1e7cb3dc CL |
1323 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1324 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1325 | ||
1da177e4 | 1326 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1327 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1328 | goto no_open; |
1329 | ||
1330 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1331 | res = ERR_PTR(-ENAMETOOLONG); | |
1332 | goto out; | |
1333 | } | |
1334 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1335 | ||
d4d9cdcb TM |
1336 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1337 | * the dentry. */ | |
3516586a | 1338 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1339 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1340 | goto out; |
1341 | } | |
1da177e4 | 1342 | |
cd9a1c0e TM |
1343 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1344 | res = ERR_CAST(ctx); | |
1345 | if (IS_ERR(ctx)) | |
1346 | goto out; | |
1347 | ||
1348 | open_flags = nd->intent.open.flags; | |
1349 | if (nd->flags & LOOKUP_CREATE) { | |
1350 | attr.ia_mode = nd->intent.open.create_mode; | |
1351 | attr.ia_valid = ATTR_MODE; | |
1352 | if (!IS_POSIXACL(dir)) | |
1353 | attr.ia_mode &= ~current_umask(); | |
1354 | } else { | |
898f635c | 1355 | open_flags &= ~(O_EXCL | O_CREAT); |
cd9a1c0e | 1356 | attr.ia_valid = 0; |
cd9a1c0e TM |
1357 | } |
1358 | ||
1da177e4 | 1359 | /* Open the file on the server */ |
f46e0bd3 | 1360 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1361 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1362 | if (IS_ERR(inode)) { |
1363 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1364 | put_nfs_open_context(ctx); |
f46e0bd3 | 1365 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1366 | /* Make a negative dentry */ |
1367 | case -ENOENT: | |
f46e0bd3 | 1368 | d_add(dentry, NULL); |
02a913a7 TM |
1369 | res = NULL; |
1370 | goto out; | |
1da177e4 | 1371 | /* This turned out not to be a regular file */ |
6f926b5b TM |
1372 | case -ENOTDIR: |
1373 | goto no_open; | |
1da177e4 LT |
1374 | case -ELOOP: |
1375 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1376 | goto no_open; | |
23ebbd9a | 1377 | /* case -EISDIR: */ |
1da177e4 LT |
1378 | /* case -EINVAL: */ |
1379 | default: | |
f46e0bd3 | 1380 | res = ERR_CAST(inode); |
1da177e4 LT |
1381 | goto out; |
1382 | } | |
cd9a1c0e | 1383 | } |
f46e0bd3 | 1384 | res = d_add_unique(dentry, inode); |
898f635c | 1385 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 TM |
1386 | if (res != NULL) { |
1387 | dput(ctx->path.dentry); | |
1388 | ctx->path.dentry = dget(res); | |
1da177e4 | 1389 | dentry = res; |
f46e0bd3 | 1390 | } |
898f635c TM |
1391 | err = nfs_intent_set_file(nd, ctx); |
1392 | if (err < 0) { | |
1393 | if (res != NULL) | |
1394 | dput(res); | |
1395 | return ERR_PTR(err); | |
1396 | } | |
1da177e4 | 1397 | out: |
f46e0bd3 | 1398 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1399 | return res; |
1400 | no_open: | |
1401 | return nfs_lookup(dir, dentry, nd); | |
1402 | } | |
1403 | ||
1404 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1405 | { | |
1406 | struct dentry *parent = NULL; | |
1407 | struct inode *inode = dentry->d_inode; | |
1408 | struct inode *dir; | |
b8d4cadd | 1409 | struct nfs_open_context *ctx; |
1da177e4 LT |
1410 | int openflags, ret = 0; |
1411 | ||
1f063d2c | 1412 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1413 | goto no_open; |
2b484297 | 1414 | |
1da177e4 LT |
1415 | parent = dget_parent(dentry); |
1416 | dir = parent->d_inode; | |
2b484297 | 1417 | |
1da177e4 LT |
1418 | /* We can't create new files in nfs_open_revalidate(), so we |
1419 | * optimize away revalidation of negative dentries. | |
1420 | */ | |
216d5d06 TM |
1421 | if (inode == NULL) { |
1422 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1423 | ret = 1; | |
1da177e4 | 1424 | goto out; |
216d5d06 TM |
1425 | } |
1426 | ||
1da177e4 LT |
1427 | /* NFS only supports OPEN on regular files */ |
1428 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1429 | goto no_open_dput; |
1da177e4 LT |
1430 | openflags = nd->intent.open.flags; |
1431 | /* We cannot do exclusive creation on a positive dentry */ | |
1432 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1433 | goto no_open_dput; |
1da177e4 | 1434 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1435 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 | 1436 | |
b8d4cadd TM |
1437 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1438 | ret = PTR_ERR(ctx); | |
1439 | if (IS_ERR(ctx)) | |
1440 | goto out; | |
1da177e4 | 1441 | /* |
1b1dcc1b | 1442 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1443 | * operations that change the directory. We therefore save the |
1444 | * change attribute *before* we do the RPC call. | |
1445 | */ | |
2b484297 | 1446 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, NULL); |
535918f1 TM |
1447 | if (IS_ERR(inode)) { |
1448 | ret = PTR_ERR(inode); | |
1449 | switch (ret) { | |
1450 | case -EPERM: | |
1451 | case -EACCES: | |
1452 | case -EDQUOT: | |
1453 | case -ENOSPC: | |
1454 | case -EROFS: | |
1455 | goto out_put_ctx; | |
1456 | default: | |
1457 | goto out_drop; | |
1458 | } | |
1459 | } | |
1460 | iput(inode); | |
898f635c | 1461 | if (inode != dentry->d_inode) |
535918f1 | 1462 | goto out_drop; |
898f635c TM |
1463 | |
1464 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1465 | ret = nfs_intent_set_file(nd, ctx); | |
1466 | if (ret >= 0) | |
1467 | ret = 1; | |
1da177e4 LT |
1468 | out: |
1469 | dput(parent); | |
1da177e4 | 1470 | return ret; |
535918f1 TM |
1471 | out_drop: |
1472 | d_drop(dentry); | |
1473 | ret = 0; | |
1474 | out_put_ctx: | |
1475 | put_nfs_open_context(ctx); | |
1476 | goto out; | |
1477 | ||
5584c306 | 1478 | no_open_dput: |
1da177e4 | 1479 | dput(parent); |
5584c306 | 1480 | no_open: |
1da177e4 LT |
1481 | return nfs_lookup_revalidate(dentry, nd); |
1482 | } | |
c0204fd2 TM |
1483 | |
1484 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, | |
1485 | struct nameidata *nd) | |
1486 | { | |
1487 | struct nfs_open_context *ctx = NULL; | |
1488 | struct iattr attr; | |
1489 | int error; | |
1490 | int open_flags = 0; | |
1491 | ||
1492 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1493 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1494 | ||
1495 | attr.ia_mode = mode; | |
1496 | attr.ia_valid = ATTR_MODE; | |
1497 | ||
1498 | if ((nd->flags & LOOKUP_CREATE) != 0) { | |
1499 | open_flags = nd->intent.open.flags; | |
1500 | ||
1501 | ctx = nameidata_to_nfs_open_context(dentry, nd); | |
1502 | error = PTR_ERR(ctx); | |
1503 | if (IS_ERR(ctx)) | |
898f635c | 1504 | goto out_err_drop; |
c0204fd2 TM |
1505 | } |
1506 | ||
1507 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1508 | if (error != 0) | |
1509 | goto out_put_ctx; | |
898f635c TM |
1510 | if (ctx != NULL) { |
1511 | error = nfs_intent_set_file(nd, ctx); | |
1512 | if (error < 0) | |
1513 | goto out_err; | |
1514 | } | |
c0204fd2 TM |
1515 | return 0; |
1516 | out_put_ctx: | |
1517 | if (ctx != NULL) | |
1518 | put_nfs_open_context(ctx); | |
898f635c | 1519 | out_err_drop: |
c0204fd2 | 1520 | d_drop(dentry); |
898f635c | 1521 | out_err: |
c0204fd2 TM |
1522 | return error; |
1523 | } | |
1524 | ||
1da177e4 LT |
1525 | #endif /* CONFIG_NFSV4 */ |
1526 | ||
1da177e4 LT |
1527 | /* |
1528 | * Code common to create, mkdir, and mknod. | |
1529 | */ | |
1530 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1531 | struct nfs_fattr *fattr) | |
1532 | { | |
fab728e1 TM |
1533 | struct dentry *parent = dget_parent(dentry); |
1534 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1535 | struct inode *inode; |
1536 | int error = -EACCES; | |
1537 | ||
fab728e1 TM |
1538 | d_drop(dentry); |
1539 | ||
1da177e4 LT |
1540 | /* We may have been initialized further down */ |
1541 | if (dentry->d_inode) | |
fab728e1 | 1542 | goto out; |
1da177e4 | 1543 | if (fhandle->size == 0) { |
1da177e4 LT |
1544 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1545 | if (error) | |
fab728e1 | 1546 | goto out_error; |
1da177e4 | 1547 | } |
5724ab37 | 1548 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1549 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1550 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1551 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1552 | if (error < 0) |
fab728e1 | 1553 | goto out_error; |
1da177e4 | 1554 | } |
1da177e4 | 1555 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1556 | error = PTR_ERR(inode); |
1557 | if (IS_ERR(inode)) | |
fab728e1 TM |
1558 | goto out_error; |
1559 | d_add(dentry, inode); | |
1560 | out: | |
1561 | dput(parent); | |
1da177e4 | 1562 | return 0; |
fab728e1 TM |
1563 | out_error: |
1564 | nfs_mark_for_revalidate(dir); | |
1565 | dput(parent); | |
1566 | return error; | |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | /* | |
1570 | * Following a failed create operation, we drop the dentry rather | |
1571 | * than retain a negative dentry. This avoids a problem in the event | |
1572 | * that the operation succeeded on the server, but an error in the | |
1573 | * reply path made it appear to have failed. | |
1574 | */ | |
1575 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1576 | struct nameidata *nd) | |
1577 | { | |
1578 | struct iattr attr; | |
1579 | int error; | |
1da177e4 | 1580 | |
1e7cb3dc CL |
1581 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1582 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1583 | |
1584 | attr.ia_mode = mode; | |
1585 | attr.ia_valid = ATTR_MODE; | |
1586 | ||
c0204fd2 | 1587 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, 0, NULL); |
1da177e4 LT |
1588 | if (error != 0) |
1589 | goto out_err; | |
1da177e4 LT |
1590 | return 0; |
1591 | out_err: | |
1da177e4 LT |
1592 | d_drop(dentry); |
1593 | return error; | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * See comments for nfs_proc_create regarding failed operations. | |
1598 | */ | |
1599 | static int | |
1600 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1601 | { | |
1602 | struct iattr attr; | |
1603 | int status; | |
1604 | ||
1e7cb3dc CL |
1605 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1606 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1607 | |
1608 | if (!new_valid_dev(rdev)) | |
1609 | return -EINVAL; | |
1610 | ||
1611 | attr.ia_mode = mode; | |
1612 | attr.ia_valid = ATTR_MODE; | |
1613 | ||
1da177e4 | 1614 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1615 | if (status != 0) |
1616 | goto out_err; | |
1da177e4 LT |
1617 | return 0; |
1618 | out_err: | |
1da177e4 LT |
1619 | d_drop(dentry); |
1620 | return status; | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * See comments for nfs_proc_create regarding failed operations. | |
1625 | */ | |
1626 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1627 | { | |
1628 | struct iattr attr; | |
1629 | int error; | |
1630 | ||
1e7cb3dc CL |
1631 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1632 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1633 | |
1634 | attr.ia_valid = ATTR_MODE; | |
1635 | attr.ia_mode = mode | S_IFDIR; | |
1636 | ||
1da177e4 | 1637 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1638 | if (error != 0) |
1639 | goto out_err; | |
1da177e4 LT |
1640 | return 0; |
1641 | out_err: | |
1642 | d_drop(dentry); | |
1da177e4 LT |
1643 | return error; |
1644 | } | |
1645 | ||
d45b9d8b TM |
1646 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1647 | { | |
1648 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1649 | d_delete(dentry); | |
1650 | } | |
1651 | ||
1da177e4 LT |
1652 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1653 | { | |
1654 | int error; | |
1655 | ||
1e7cb3dc CL |
1656 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1657 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1658 | |
1da177e4 LT |
1659 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1660 | /* Ensure the VFS deletes this inode */ | |
1661 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1662 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1663 | else if (error == -ENOENT) |
1664 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1665 | |
1666 | return error; | |
1667 | } | |
1668 | ||
1da177e4 LT |
1669 | /* |
1670 | * Remove a file after making sure there are no pending writes, | |
1671 | * and after checking that the file has only one user. | |
1672 | * | |
1673 | * We invalidate the attribute cache and free the inode prior to the operation | |
1674 | * to avoid possible races if the server reuses the inode. | |
1675 | */ | |
1676 | static int nfs_safe_remove(struct dentry *dentry) | |
1677 | { | |
1678 | struct inode *dir = dentry->d_parent->d_inode; | |
1679 | struct inode *inode = dentry->d_inode; | |
1680 | int error = -EBUSY; | |
1681 | ||
1682 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1683 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1684 | ||
1685 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1686 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1687 | error = 0; | |
1688 | goto out; | |
1689 | } | |
1690 | ||
1da177e4 | 1691 | if (inode != NULL) { |
cae7a073 | 1692 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1693 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1694 | /* The VFS may want to delete this inode */ | |
1695 | if (error == 0) | |
1b83d707 | 1696 | nfs_drop_nlink(inode); |
5ba7cc48 | 1697 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1698 | } else |
1699 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1700 | if (error == -ENOENT) |
1701 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1702 | out: |
1703 | return error; | |
1704 | } | |
1705 | ||
1706 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1707 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1708 | * | |
1709 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1710 | */ | |
1711 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1712 | { | |
1713 | int error; | |
1714 | int need_rehash = 0; | |
1715 | ||
1716 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1717 | dir->i_ino, dentry->d_name.name); | |
1718 | ||
1da177e4 LT |
1719 | spin_lock(&dcache_lock); |
1720 | spin_lock(&dentry->d_lock); | |
1721 | if (atomic_read(&dentry->d_count) > 1) { | |
1722 | spin_unlock(&dentry->d_lock); | |
1723 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1724 | /* Start asynchronous writeout of the inode */ |
1725 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1726 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1727 | return error; |
1728 | } | |
1729 | if (!d_unhashed(dentry)) { | |
1730 | __d_drop(dentry); | |
1731 | need_rehash = 1; | |
1732 | } | |
1733 | spin_unlock(&dentry->d_lock); | |
1734 | spin_unlock(&dcache_lock); | |
1735 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1736 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1737 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1738 | } else if (need_rehash) | |
1739 | d_rehash(dentry); | |
1da177e4 LT |
1740 | return error; |
1741 | } | |
1742 | ||
873101b3 CL |
1743 | /* |
1744 | * To create a symbolic link, most file systems instantiate a new inode, | |
1745 | * add a page to it containing the path, then write it out to the disk | |
1746 | * using prepare_write/commit_write. | |
1747 | * | |
1748 | * Unfortunately the NFS client can't create the in-core inode first | |
1749 | * because it needs a file handle to create an in-core inode (see | |
1750 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1751 | * symlink request has completed on the server. | |
1752 | * | |
1753 | * So instead we allocate a raw page, copy the symname into it, then do | |
1754 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1755 | * now have a new file handle and can instantiate an in-core NFS inode | |
1756 | * and move the raw page into its mapping. | |
1757 | */ | |
1758 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1759 | { |
873101b3 CL |
1760 | struct pagevec lru_pvec; |
1761 | struct page *page; | |
1762 | char *kaddr; | |
1da177e4 | 1763 | struct iattr attr; |
873101b3 | 1764 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1765 | int error; |
1766 | ||
1767 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1768 | dir->i_ino, dentry->d_name.name, symname); | |
1769 | ||
873101b3 CL |
1770 | if (pathlen > PAGE_SIZE) |
1771 | return -ENAMETOOLONG; | |
1da177e4 | 1772 | |
873101b3 CL |
1773 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1774 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1775 | |
83d93f22 | 1776 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1777 | if (!page) |
873101b3 | 1778 | return -ENOMEM; |
873101b3 CL |
1779 | |
1780 | kaddr = kmap_atomic(page, KM_USER0); | |
1781 | memcpy(kaddr, symname, pathlen); | |
1782 | if (pathlen < PAGE_SIZE) | |
1783 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1784 | kunmap_atomic(kaddr, KM_USER0); | |
1785 | ||
94a6d753 | 1786 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1787 | if (error != 0) { |
1788 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1789 | dir->i_sb->s_id, dir->i_ino, | |
1790 | dentry->d_name.name, symname, error); | |
1da177e4 | 1791 | d_drop(dentry); |
873101b3 | 1792 | __free_page(page); |
873101b3 CL |
1793 | return error; |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * No big deal if we can't add this page to the page cache here. | |
1798 | * READLINK will get the missing page from the server if needed. | |
1799 | */ | |
1800 | pagevec_init(&lru_pvec, 0); | |
1801 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1802 | GFP_KERNEL)) { | |
39cf8a13 | 1803 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1804 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1805 | SetPageUptodate(page); |
1806 | unlock_page(page); | |
1807 | } else | |
1808 | __free_page(page); | |
1809 | ||
873101b3 | 1810 | return 0; |
1da177e4 LT |
1811 | } |
1812 | ||
1813 | static int | |
1814 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1815 | { | |
1816 | struct inode *inode = old_dentry->d_inode; | |
1817 | int error; | |
1818 | ||
1819 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1820 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1821 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1822 | ||
9a3936aa TM |
1823 | nfs_inode_return_delegation(inode); |
1824 | ||
9697d234 | 1825 | d_drop(dentry); |
1da177e4 | 1826 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1827 | if (error == 0) { |
7de9c6ee | 1828 | ihold(inode); |
9697d234 | 1829 | d_add(dentry, inode); |
cf809556 | 1830 | } |
1da177e4 LT |
1831 | return error; |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * RENAME | |
1836 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1837 | * different file handle for the same inode after a rename (e.g. when | |
1838 | * moving to a different directory). A fail-safe method to do so would | |
1839 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1840 | * rename the old file using the sillyrename stuff. This way, the original | |
1841 | * file in old_dir will go away when the last process iput()s the inode. | |
1842 | * | |
1843 | * FIXED. | |
1844 | * | |
1845 | * It actually works quite well. One needs to have the possibility for | |
1846 | * at least one ".nfs..." file in each directory the file ever gets | |
1847 | * moved or linked to which happens automagically with the new | |
1848 | * implementation that only depends on the dcache stuff instead of | |
1849 | * using the inode layer | |
1850 | * | |
1851 | * Unfortunately, things are a little more complicated than indicated | |
1852 | * above. For a cross-directory move, we want to make sure we can get | |
1853 | * rid of the old inode after the operation. This means there must be | |
1854 | * no pending writes (if it's a file), and the use count must be 1. | |
1855 | * If these conditions are met, we can drop the dentries before doing | |
1856 | * the rename. | |
1857 | */ | |
1858 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1859 | struct inode *new_dir, struct dentry *new_dentry) | |
1860 | { | |
1861 | struct inode *old_inode = old_dentry->d_inode; | |
1862 | struct inode *new_inode = new_dentry->d_inode; | |
1863 | struct dentry *dentry = NULL, *rehash = NULL; | |
1864 | int error = -EBUSY; | |
1865 | ||
1da177e4 LT |
1866 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1867 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1868 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1869 | atomic_read(&new_dentry->d_count)); | |
1870 | ||
1871 | /* | |
28f79a1a MS |
1872 | * For non-directories, check whether the target is busy and if so, |
1873 | * make a copy of the dentry and then do a silly-rename. If the | |
1874 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1875 | * the new target. | |
1da177e4 | 1876 | */ |
27226104 MS |
1877 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1878 | /* | |
1879 | * To prevent any new references to the target during the | |
1880 | * rename, we unhash the dentry in advance. | |
1881 | */ | |
1882 | if (!d_unhashed(new_dentry)) { | |
1883 | d_drop(new_dentry); | |
1884 | rehash = new_dentry; | |
1885 | } | |
1da177e4 | 1886 | |
27226104 MS |
1887 | if (atomic_read(&new_dentry->d_count) > 2) { |
1888 | int err; | |
1889 | ||
1890 | /* copy the target dentry's name */ | |
1891 | dentry = d_alloc(new_dentry->d_parent, | |
1892 | &new_dentry->d_name); | |
1893 | if (!dentry) | |
1894 | goto out; | |
1895 | ||
1896 | /* silly-rename the existing target ... */ | |
1897 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1898 | if (err) |
27226104 | 1899 | goto out; |
24e93025 MS |
1900 | |
1901 | new_dentry = dentry; | |
56335936 | 1902 | rehash = NULL; |
24e93025 | 1903 | new_inode = NULL; |
27226104 | 1904 | } |
b1e4adf4 | 1905 | } |
1da177e4 | 1906 | |
cae7a073 | 1907 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1908 | if (new_inode != NULL) |
24174119 | 1909 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1910 | |
1da177e4 LT |
1911 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1912 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1913 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1914 | out: |
1915 | if (rehash) | |
1916 | d_rehash(rehash); | |
1917 | if (!error) { | |
b1e4adf4 TM |
1918 | if (new_inode != NULL) |
1919 | nfs_drop_nlink(new_inode); | |
349457cc | 1920 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1921 | nfs_set_verifier(new_dentry, |
1922 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1923 | } else if (error == -ENOENT) |
1924 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1925 | |
1926 | /* new dentry created? */ | |
1927 | if (dentry) | |
1928 | dput(dentry); | |
1da177e4 LT |
1929 | return error; |
1930 | } | |
1931 | ||
cfcea3e8 TM |
1932 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1933 | static LIST_HEAD(nfs_access_lru_list); | |
1934 | static atomic_long_t nfs_access_nr_entries; | |
1935 | ||
1c3c07e9 TM |
1936 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1937 | { | |
1938 | put_rpccred(entry->cred); | |
1939 | kfree(entry); | |
cfcea3e8 TM |
1940 | smp_mb__before_atomic_dec(); |
1941 | atomic_long_dec(&nfs_access_nr_entries); | |
1942 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1943 | } |
1944 | ||
1a81bb8a TM |
1945 | static void nfs_access_free_list(struct list_head *head) |
1946 | { | |
1947 | struct nfs_access_entry *cache; | |
1948 | ||
1949 | while (!list_empty(head)) { | |
1950 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1951 | list_del(&cache->lru); | |
1952 | nfs_access_free_entry(cache); | |
1953 | } | |
1954 | } | |
1955 | ||
7f8275d0 | 1956 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
1957 | { |
1958 | LIST_HEAD(head); | |
aa510da5 | 1959 | struct nfs_inode *nfsi, *next; |
979df72e TM |
1960 | struct nfs_access_entry *cache; |
1961 | ||
61d5eb29 TM |
1962 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1963 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1964 | |
a50f7951 | 1965 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1966 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1967 | struct inode *inode; |
1968 | ||
1969 | if (nr_to_scan-- == 0) | |
1970 | break; | |
9c7e7e23 | 1971 | inode = &nfsi->vfs_inode; |
979df72e TM |
1972 | spin_lock(&inode->i_lock); |
1973 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1974 | goto remove_lru_entry; | |
1975 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1976 | struct nfs_access_entry, lru); | |
1977 | list_move(&cache->lru, &head); | |
1978 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1979 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1980 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1981 | &nfs_access_lru_list); | |
1982 | else { | |
1983 | remove_lru_entry: | |
1984 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1985 | smp_mb__before_clear_bit(); |
979df72e | 1986 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1987 | smp_mb__after_clear_bit(); |
979df72e | 1988 | } |
59844a9b | 1989 | spin_unlock(&inode->i_lock); |
979df72e TM |
1990 | } |
1991 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1992 | nfs_access_free_list(&head); |
979df72e TM |
1993 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1994 | } | |
1995 | ||
1a81bb8a | 1996 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1997 | { |
1c3c07e9 | 1998 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1999 | struct rb_node *n; |
1c3c07e9 TM |
2000 | struct nfs_access_entry *entry; |
2001 | ||
2002 | /* Unhook entries from the cache */ | |
2003 | while ((n = rb_first(root_node)) != NULL) { | |
2004 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2005 | rb_erase(n, root_node); | |
1a81bb8a | 2006 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2007 | } |
2008 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2009 | } |
2010 | ||
1c3c07e9 | 2011 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2012 | { |
1a81bb8a TM |
2013 | LIST_HEAD(head); |
2014 | ||
2015 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2016 | return; | |
cfcea3e8 | 2017 | /* Remove from global LRU init */ |
1a81bb8a TM |
2018 | spin_lock(&nfs_access_lru_lock); |
2019 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2020 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2021 | |
1c3c07e9 | 2022 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2023 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2024 | spin_unlock(&inode->i_lock); | |
2025 | spin_unlock(&nfs_access_lru_lock); | |
2026 | nfs_access_free_list(&head); | |
1c3c07e9 | 2027 | } |
1da177e4 | 2028 | |
1c3c07e9 TM |
2029 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2030 | { | |
2031 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2032 | struct nfs_access_entry *entry; | |
2033 | ||
2034 | while (n != NULL) { | |
2035 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2036 | ||
2037 | if (cred < entry->cred) | |
2038 | n = n->rb_left; | |
2039 | else if (cred > entry->cred) | |
2040 | n = n->rb_right; | |
2041 | else | |
2042 | return entry; | |
1da177e4 | 2043 | } |
1c3c07e9 TM |
2044 | return NULL; |
2045 | } | |
2046 | ||
af22f94a | 2047 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2048 | { |
2049 | struct nfs_inode *nfsi = NFS_I(inode); | |
2050 | struct nfs_access_entry *cache; | |
2051 | int err = -ENOENT; | |
2052 | ||
dc59250c | 2053 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2054 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2055 | goto out_zap; | |
2056 | cache = nfs_access_search_rbtree(inode, cred); | |
2057 | if (cache == NULL) | |
2058 | goto out; | |
b4d2314b | 2059 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2060 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2061 | goto out_stale; |
2062 | res->jiffies = cache->jiffies; | |
2063 | res->cred = cache->cred; | |
2064 | res->mask = cache->mask; | |
cfcea3e8 | 2065 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2066 | err = 0; |
2067 | out: | |
2068 | spin_unlock(&inode->i_lock); | |
2069 | return err; | |
2070 | out_stale: | |
2071 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2072 | list_del(&cache->lru); |
1c3c07e9 TM |
2073 | spin_unlock(&inode->i_lock); |
2074 | nfs_access_free_entry(cache); | |
2075 | return -ENOENT; | |
2076 | out_zap: | |
1a81bb8a TM |
2077 | spin_unlock(&inode->i_lock); |
2078 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2079 | return -ENOENT; |
2080 | } | |
2081 | ||
2082 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2083 | { | |
cfcea3e8 TM |
2084 | struct nfs_inode *nfsi = NFS_I(inode); |
2085 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2086 | struct rb_node **p = &root_node->rb_node; |
2087 | struct rb_node *parent = NULL; | |
2088 | struct nfs_access_entry *entry; | |
2089 | ||
2090 | spin_lock(&inode->i_lock); | |
2091 | while (*p != NULL) { | |
2092 | parent = *p; | |
2093 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2094 | ||
2095 | if (set->cred < entry->cred) | |
2096 | p = &parent->rb_left; | |
2097 | else if (set->cred > entry->cred) | |
2098 | p = &parent->rb_right; | |
2099 | else | |
2100 | goto found; | |
2101 | } | |
2102 | rb_link_node(&set->rb_node, parent, p); | |
2103 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2104 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2105 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2106 | return; |
2107 | found: | |
2108 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2109 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2110 | list_del(&entry->lru); | |
1c3c07e9 TM |
2111 | spin_unlock(&inode->i_lock); |
2112 | nfs_access_free_entry(entry); | |
2113 | } | |
2114 | ||
af22f94a | 2115 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2116 | { |
2117 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2118 | if (cache == NULL) | |
2119 | return; | |
2120 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2121 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2122 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2123 | cache->mask = set->mask; |
1c3c07e9 TM |
2124 | |
2125 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2126 | |
2127 | /* Update accounting */ | |
2128 | smp_mb__before_atomic_inc(); | |
2129 | atomic_long_inc(&nfs_access_nr_entries); | |
2130 | smp_mb__after_atomic_inc(); | |
2131 | ||
2132 | /* Add inode to global LRU list */ | |
1a81bb8a | 2133 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2134 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2135 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2136 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2137 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2138 | spin_unlock(&nfs_access_lru_lock); |
2139 | } | |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2143 | { | |
2144 | struct nfs_access_entry cache; | |
2145 | int status; | |
2146 | ||
2147 | status = nfs_access_get_cached(inode, cred, &cache); | |
2148 | if (status == 0) | |
2149 | goto out; | |
2150 | ||
2151 | /* Be clever: ask server to check for all possible rights */ | |
2152 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2153 | cache.cred = cred; | |
2154 | cache.jiffies = jiffies; | |
2155 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2156 | if (status != 0) { |
2157 | if (status == -ESTALE) { | |
2158 | nfs_zap_caches(inode); | |
2159 | if (!S_ISDIR(inode->i_mode)) | |
2160 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2161 | } | |
1da177e4 | 2162 | return status; |
a71ee337 | 2163 | } |
1da177e4 LT |
2164 | nfs_access_add_cache(inode, &cache); |
2165 | out: | |
e6305c43 | 2166 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2167 | return 0; |
2168 | return -EACCES; | |
2169 | } | |
2170 | ||
af22f94a TM |
2171 | static int nfs_open_permission_mask(int openflags) |
2172 | { | |
2173 | int mask = 0; | |
2174 | ||
2175 | if (openflags & FMODE_READ) | |
2176 | mask |= MAY_READ; | |
2177 | if (openflags & FMODE_WRITE) | |
2178 | mask |= MAY_WRITE; | |
2179 | if (openflags & FMODE_EXEC) | |
2180 | mask |= MAY_EXEC; | |
2181 | return mask; | |
2182 | } | |
2183 | ||
2184 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2185 | { | |
2186 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2187 | } | |
2188 | ||
e6305c43 | 2189 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2190 | { |
2191 | struct rpc_cred *cred; | |
2192 | int res = 0; | |
2193 | ||
91d5b470 CL |
2194 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2195 | ||
e6305c43 | 2196 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2197 | goto out; |
2198 | /* Is this sys_access() ? */ | |
9cfcac81 | 2199 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2200 | goto force_lookup; |
2201 | ||
2202 | switch (inode->i_mode & S_IFMT) { | |
2203 | case S_IFLNK: | |
2204 | goto out; | |
2205 | case S_IFREG: | |
2206 | /* NFSv4 has atomic_open... */ | |
2207 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2208 | && (mask & MAY_OPEN) |
2209 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2210 | goto out; |
2211 | break; | |
2212 | case S_IFDIR: | |
2213 | /* | |
2214 | * Optimize away all write operations, since the server | |
2215 | * will check permissions when we perform the op. | |
2216 | */ | |
2217 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2218 | goto out; | |
2219 | } | |
2220 | ||
2221 | force_lookup: | |
1da177e4 LT |
2222 | if (!NFS_PROTO(inode)->access) |
2223 | goto out_notsup; | |
2224 | ||
98a8e323 | 2225 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2226 | if (!IS_ERR(cred)) { |
2227 | res = nfs_do_access(inode, cred, mask); | |
2228 | put_rpccred(cred); | |
2229 | } else | |
2230 | res = PTR_ERR(cred); | |
1da177e4 | 2231 | out: |
f696a365 MS |
2232 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2233 | res = -EACCES; | |
2234 | ||
1e7cb3dc CL |
2235 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2236 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2237 | return res; |
2238 | out_notsup: | |
2239 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2240 | if (res == 0) | |
2241 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 2242 | goto out; |
1da177e4 LT |
2243 | } |
2244 | ||
2245 | /* | |
2246 | * Local variables: | |
2247 | * version-control: t | |
2248 | * kept-new-versions: 5 | |
2249 | * End: | |
2250 | */ |