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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> |
56e4ebf8 | 36 | #include <linux/vmalloc.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); |
d1bacf9e | 59 | static int nfs_readdir_clear_array(struct page*, gfp_t); |
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 | ||
d1bacf9e BS |
85 | const struct address_space_operations nfs_dir_addr_space_ops = { |
86 | .releasepage = nfs_readdir_clear_array, | |
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; | |
164 | }; | |
165 | ||
166 | struct nfs_cache_array { | |
167 | unsigned int size; | |
168 | int eof_index; | |
169 | u64 last_cookie; | |
170 | struct nfs_cache_array_entry array[0]; | |
171 | }; | |
172 | ||
173 | #define MAX_READDIR_ARRAY ((PAGE_SIZE - sizeof(struct nfs_cache_array)) / sizeof(struct nfs_cache_array_entry)) | |
174 | ||
82f2e547 | 175 | typedef __be32 * (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int); |
1da177e4 LT |
176 | typedef struct { |
177 | struct file *file; | |
178 | struct page *page; | |
179 | unsigned long page_index; | |
f0dd2136 TM |
180 | u64 *dir_cookie; |
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 | |
216 | int nfs_readdir_clear_array(struct page *page, gfp_t mask) | |
217 | { | |
218 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
219 | int i; | |
8cd51a0c TM |
220 | |
221 | if (IS_ERR(array)) | |
222 | return PTR_ERR(array); | |
d1bacf9e BS |
223 | for (i = 0; i < array->size; i++) |
224 | kfree(array->array[i].string.name); | |
225 | nfs_readdir_release_array(page); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /* | |
230 | * the caller is responsible for freeing qstr.name | |
231 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
232 | * nfs_clear_readdir_array() | |
233 | */ | |
234 | static | |
4a201d6e | 235 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
236 | { |
237 | string->len = len; | |
238 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
239 | if (string->name == NULL) |
240 | return -ENOMEM; | |
241 | string->hash = full_name_hash(name, len); | |
242 | return 0; | |
d1bacf9e BS |
243 | } |
244 | ||
245 | static | |
246 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
247 | { | |
248 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
249 | struct nfs_cache_array_entry *cache_entry; |
250 | int ret; | |
251 | ||
d1bacf9e BS |
252 | if (IS_ERR(array)) |
253 | return PTR_ERR(array); | |
8cd51a0c | 254 | ret = -ENOSPC; |
4a201d6e TM |
255 | if (array->size >= MAX_READDIR_ARRAY) |
256 | goto out; | |
d1bacf9e | 257 | |
4a201d6e TM |
258 | cache_entry = &array->array[array->size]; |
259 | cache_entry->cookie = entry->prev_cookie; | |
260 | cache_entry->ino = entry->ino; | |
261 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); | |
262 | if (ret) | |
263 | goto out; | |
d1bacf9e | 264 | array->last_cookie = entry->cookie; |
8cd51a0c | 265 | array->size++; |
d1bacf9e BS |
266 | if (entry->eof == 1) |
267 | array->eof_index = array->size; | |
4a201d6e | 268 | out: |
d1bacf9e | 269 | nfs_readdir_release_array(page); |
4a201d6e | 270 | return ret; |
d1bacf9e BS |
271 | } |
272 | ||
273 | static | |
274 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
275 | { | |
276 | loff_t diff = desc->file->f_pos - desc->current_index; | |
277 | unsigned int index; | |
278 | ||
279 | if (diff < 0) | |
280 | goto out_eof; | |
281 | if (diff >= array->size) { | |
8cd51a0c | 282 | if (array->eof_index >= 0) |
d1bacf9e BS |
283 | goto out_eof; |
284 | desc->current_index += array->size; | |
285 | return -EAGAIN; | |
286 | } | |
287 | ||
288 | index = (unsigned int)diff; | |
289 | *desc->dir_cookie = array->array[index].cookie; | |
290 | desc->cache_entry_index = index; | |
d1bacf9e BS |
291 | return 0; |
292 | out_eof: | |
293 | desc->eof = 1; | |
294 | return -EBADCOOKIE; | |
295 | } | |
296 | ||
297 | static | |
298 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
299 | { | |
300 | int i; | |
301 | int status = -EAGAIN; | |
302 | ||
303 | for (i = 0; i < array->size; i++) { | |
d1bacf9e BS |
304 | if (array->array[i].cookie == *desc->dir_cookie) { |
305 | desc->cache_entry_index = i; | |
306 | status = 0; | |
8cd51a0c | 307 | goto out; |
d1bacf9e BS |
308 | } |
309 | } | |
8cd51a0c TM |
310 | if (i == array->eof_index) { |
311 | desc->eof = 1; | |
312 | status = -EBADCOOKIE; | |
313 | } | |
314 | out: | |
d1bacf9e BS |
315 | return status; |
316 | } | |
317 | ||
318 | static | |
319 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
320 | { | |
321 | struct nfs_cache_array *array; | |
322 | int status = -EBADCOOKIE; | |
323 | ||
324 | if (desc->dir_cookie == NULL) | |
325 | goto out; | |
326 | ||
327 | array = nfs_readdir_get_array(desc->page); | |
328 | if (IS_ERR(array)) { | |
329 | status = PTR_ERR(array); | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if (*desc->dir_cookie == 0) | |
334 | status = nfs_readdir_search_for_pos(array, desc); | |
335 | else | |
336 | status = nfs_readdir_search_for_cookie(array, desc); | |
337 | ||
338 | nfs_readdir_release_array(desc->page); | |
339 | out: | |
340 | return status; | |
341 | } | |
342 | ||
343 | /* Fill a page with xdr information before transferring to the cache page */ | |
344 | static | |
56e4ebf8 | 345 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 346 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 347 | { |
1da177e4 | 348 | struct rpc_cred *cred = nfs_file_cred(file); |
4704f0e2 | 349 | unsigned long timestamp, gencount; |
1da177e4 LT |
350 | int error; |
351 | ||
1da177e4 LT |
352 | again: |
353 | timestamp = jiffies; | |
4704f0e2 | 354 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 355 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
356 | NFS_SERVER(inode)->dtsize, desc->plus); |
357 | if (error < 0) { | |
358 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
359 | if (error == -ENOTSUPP && desc->plus) { | |
360 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 361 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
362 | desc->plus = 0; |
363 | goto again; | |
364 | } | |
365 | goto error; | |
366 | } | |
1f4eab7e | 367 | desc->timestamp = timestamp; |
4704f0e2 | 368 | desc->gencount = gencount; |
d1bacf9e BS |
369 | error: |
370 | return error; | |
1da177e4 LT |
371 | } |
372 | ||
d1bacf9e BS |
373 | /* Fill in an entry based on the xdr code stored in desc->page */ |
374 | static | |
babddc72 | 375 | int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, struct xdr_stream *stream) |
1da177e4 | 376 | { |
82f2e547 | 377 | __be32 *p = desc->decode(stream, entry, NFS_SERVER(desc->file->f_path.dentry->d_inode), desc->plus); |
1da177e4 LT |
378 | if (IS_ERR(p)) |
379 | return PTR_ERR(p); | |
1da177e4 | 380 | |
d1bacf9e BS |
381 | entry->fattr->time_start = desc->timestamp; |
382 | entry->fattr->gencount = desc->gencount; | |
383 | return 0; | |
1da177e4 LT |
384 | } |
385 | ||
d39ab9de BS |
386 | static |
387 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
388 | { | |
389 | struct nfs_inode *node; | |
390 | if (dentry->d_inode == NULL) | |
391 | goto different; | |
392 | node = NFS_I(dentry->d_inode); | |
393 | if (node->fh.size != entry->fh->size) | |
394 | goto different; | |
395 | if (strncmp(node->fh.data, entry->fh->data, node->fh.size) != 0) | |
396 | goto different; | |
397 | return 1; | |
398 | different: | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static | |
403 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
404 | { | |
4a201d6e TM |
405 | struct qstr filename = { |
406 | .len = entry->len, | |
407 | .name = entry->name, | |
408 | }; | |
409 | struct dentry *dentry; | |
410 | struct dentry *alias; | |
d39ab9de BS |
411 | struct inode *dir = parent->d_inode; |
412 | struct inode *inode; | |
413 | ||
4a201d6e TM |
414 | if (filename.name[0] == '.') { |
415 | if (filename.len == 1) | |
416 | return; | |
417 | if (filename.len == 2 && filename.name[1] == '.') | |
418 | return; | |
419 | } | |
420 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 421 | |
4a201d6e | 422 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
423 | if (dentry != NULL) { |
424 | if (nfs_same_file(dentry, entry)) { | |
425 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
426 | goto out; | |
427 | } else { | |
428 | d_drop(dentry); | |
429 | dput(dentry); | |
430 | } | |
431 | } | |
432 | ||
433 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
434 | if (dentry == NULL) |
435 | return; | |
436 | ||
d39ab9de BS |
437 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
438 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); | |
439 | if (IS_ERR(inode)) | |
440 | goto out; | |
441 | ||
442 | alias = d_materialise_unique(dentry, inode); | |
443 | if (IS_ERR(alias)) | |
444 | goto out; | |
445 | else if (alias) { | |
446 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
447 | dput(alias); | |
448 | } else | |
449 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
450 | ||
451 | out: | |
452 | dput(dentry); | |
d39ab9de BS |
453 | } |
454 | ||
d1bacf9e BS |
455 | /* Perform conversion from xdr to cache array */ |
456 | static | |
8cd51a0c | 457 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
56e4ebf8 | 458 | void *xdr_page, struct page *page, unsigned int buflen) |
1da177e4 | 459 | { |
babddc72 BS |
460 | struct xdr_stream stream; |
461 | struct xdr_buf buf; | |
56e4ebf8 | 462 | __be32 *ptr = xdr_page; |
99424380 BS |
463 | int status; |
464 | struct nfs_cache_array *array; | |
babddc72 BS |
465 | |
466 | buf.head->iov_base = xdr_page; | |
467 | buf.head->iov_len = buflen; | |
468 | buf.tail->iov_len = 0; | |
469 | buf.page_base = 0; | |
470 | buf.page_len = 0; | |
471 | buf.buflen = buf.head->iov_len; | |
472 | buf.len = buf.head->iov_len; | |
473 | ||
474 | xdr_init_decode(&stream, &buf, ptr); | |
475 | ||
99424380 BS |
476 | |
477 | do { | |
478 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
479 | if (status != 0) { |
480 | if (status == -EAGAIN) | |
481 | status = 0; | |
99424380 | 482 | break; |
8cd51a0c | 483 | } |
99424380 | 484 | |
d39ab9de BS |
485 | if (desc->plus == 1) |
486 | nfs_prime_dcache(desc->file->f_path.dentry, entry); | |
8cd51a0c TM |
487 | |
488 | status = nfs_readdir_add_to_array(entry, page); | |
489 | if (status != 0) | |
490 | break; | |
99424380 BS |
491 | } while (!entry->eof); |
492 | ||
493 | if (status == -EBADCOOKIE && entry->eof) { | |
494 | array = nfs_readdir_get_array(page); | |
8cd51a0c TM |
495 | if (!IS_ERR(array)) { |
496 | array->eof_index = array->size; | |
497 | status = 0; | |
498 | nfs_readdir_release_array(page); | |
499 | } | |
1da177e4 | 500 | } |
8cd51a0c | 501 | return status; |
56e4ebf8 BS |
502 | } |
503 | ||
504 | static | |
505 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
506 | { | |
507 | unsigned int i; | |
508 | for (i = 0; i < npages; i++) | |
509 | put_page(pages[i]); | |
510 | } | |
511 | ||
512 | static | |
513 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
514 | unsigned int npages) | |
515 | { | |
516 | vm_unmap_ram(ptr, npages); | |
517 | nfs_readdir_free_pagearray(pages, npages); | |
518 | } | |
519 | ||
520 | /* | |
521 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
522 | * to nfs_readdir_free_large_page | |
523 | */ | |
524 | static | |
525 | void *nfs_readdir_large_page(struct page **pages, unsigned int npages) | |
526 | { | |
527 | void *ptr; | |
528 | unsigned int i; | |
529 | ||
530 | for (i = 0; i < npages; i++) { | |
531 | struct page *page = alloc_page(GFP_KERNEL); | |
532 | if (page == NULL) | |
533 | goto out_freepages; | |
534 | pages[i] = page; | |
535 | } | |
536 | ||
4a201d6e | 537 | ptr = vm_map_ram(pages, npages, 0, PAGE_KERNEL); |
56e4ebf8 BS |
538 | if (!IS_ERR_OR_NULL(ptr)) |
539 | return ptr; | |
540 | out_freepages: | |
541 | nfs_readdir_free_pagearray(pages, i); | |
542 | return NULL; | |
1da177e4 LT |
543 | } |
544 | ||
d1bacf9e BS |
545 | static |
546 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 547 | { |
56e4ebf8 BS |
548 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
549 | void *pages_ptr = NULL; | |
d1bacf9e BS |
550 | struct nfs_entry entry; |
551 | struct file *file = desc->file; | |
552 | struct nfs_cache_array *array; | |
8cd51a0c | 553 | int status = -ENOMEM; |
56e4ebf8 | 554 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
555 | |
556 | entry.prev_cookie = 0; | |
557 | entry.cookie = *desc->dir_cookie; | |
558 | entry.eof = 0; | |
559 | entry.fh = nfs_alloc_fhandle(); | |
560 | entry.fattr = nfs_alloc_fattr(); | |
561 | if (entry.fh == NULL || entry.fattr == NULL) | |
562 | goto out; | |
00a92642 | 563 | |
d1bacf9e | 564 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
565 | if (IS_ERR(array)) { |
566 | status = PTR_ERR(array); | |
567 | goto out; | |
568 | } | |
d1bacf9e BS |
569 | memset(array, 0, sizeof(struct nfs_cache_array)); |
570 | array->eof_index = -1; | |
00a92642 | 571 | |
56e4ebf8 BS |
572 | pages_ptr = nfs_readdir_large_page(pages, array_size); |
573 | if (!pages_ptr) | |
d1bacf9e BS |
574 | goto out_release_array; |
575 | do { | |
56e4ebf8 | 576 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 577 | |
d1bacf9e | 578 | if (status < 0) |
00a92642 | 579 | break; |
8cd51a0c TM |
580 | status = nfs_readdir_page_filler(desc, &entry, pages_ptr, page, array_size * PAGE_SIZE); |
581 | if (status < 0) { | |
582 | if (status == -ENOSPC) | |
583 | status = 0; | |
584 | break; | |
585 | } | |
586 | } while (array->eof_index < 0); | |
d1bacf9e | 587 | |
56e4ebf8 | 588 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
589 | out_release_array: |
590 | nfs_readdir_release_array(page); | |
591 | out: | |
592 | nfs_free_fattr(entry.fattr); | |
593 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
594 | return status; |
595 | } | |
596 | ||
597 | /* | |
d1bacf9e BS |
598 | * Now we cache directories properly, by converting xdr information |
599 | * to an array that can be used for lookups later. This results in | |
600 | * fewer cache pages, since we can store more information on each page. | |
601 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 602 | */ |
d1bacf9e BS |
603 | static |
604 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 605 | { |
01cce933 | 606 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 607 | int ret; |
1da177e4 | 608 | |
8cd51a0c TM |
609 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
610 | if (ret < 0) | |
d1bacf9e BS |
611 | goto error; |
612 | SetPageUptodate(page); | |
1da177e4 | 613 | |
d1bacf9e BS |
614 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
615 | /* Should never happen */ | |
616 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 617 | } |
d1bacf9e BS |
618 | unlock_page(page); |
619 | return 0; | |
620 | error: | |
621 | unlock_page(page); | |
8cd51a0c | 622 | return ret; |
d1bacf9e | 623 | } |
1da177e4 | 624 | |
d1bacf9e BS |
625 | static |
626 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
627 | { | |
628 | page_cache_release(desc->page); | |
629 | desc->page = NULL; | |
630 | } | |
631 | ||
632 | static | |
633 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
634 | { | |
8cd51a0c | 635 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 636 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
637 | } |
638 | ||
639 | /* | |
d1bacf9e | 640 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 641 | */ |
d1bacf9e BS |
642 | static |
643 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
644 | { | |
645 | int res; | |
646 | ||
647 | desc->page = get_cache_page(desc); | |
648 | if (IS_ERR(desc->page)) | |
649 | return PTR_ERR(desc->page); | |
650 | ||
651 | res = nfs_readdir_search_array(desc); | |
652 | if (res == 0) | |
653 | return 0; | |
654 | cache_page_release(desc); | |
655 | return res; | |
656 | } | |
657 | ||
658 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
659 | static inline |
660 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
661 | { | |
8cd51a0c | 662 | int res; |
d1bacf9e | 663 | |
8cd51a0c TM |
664 | if (desc->page_index == 0) |
665 | desc->current_index = 0; | |
d1bacf9e BS |
666 | while (1) { |
667 | res = find_cache_page(desc); | |
1da177e4 LT |
668 | if (res != -EAGAIN) |
669 | break; | |
d1bacf9e | 670 | desc->page_index++; |
1da177e4 | 671 | } |
1da177e4 LT |
672 | return res; |
673 | } | |
674 | ||
675 | static inline unsigned int dt_type(struct inode *inode) | |
676 | { | |
677 | return (inode->i_mode >> 12) & 15; | |
678 | } | |
679 | ||
1da177e4 LT |
680 | /* |
681 | * Once we've found the start of the dirent within a page: fill 'er up... | |
682 | */ | |
683 | static | |
684 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
685 | filldir_t filldir) | |
686 | { | |
687 | struct file *file = desc->file; | |
d1bacf9e BS |
688 | int i = 0; |
689 | int res = 0; | |
690 | struct nfs_cache_array *array = NULL; | |
691 | unsigned int d_type = DT_UNKNOWN; | |
692 | struct dentry *dentry = NULL; | |
693 | ||
694 | array = nfs_readdir_get_array(desc->page); | |
8cd51a0c TM |
695 | if (IS_ERR(array)) |
696 | return PTR_ERR(array); | |
d1bacf9e BS |
697 | |
698 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
699 | d_type = DT_UNKNOWN; | |
1da177e4 | 700 | |
d1bacf9e BS |
701 | res = filldir(dirent, array->array[i].string.name, |
702 | array->array[i].string.len, file->f_pos, | |
703 | nfs_compat_user_ino64(array->array[i].ino), d_type); | |
1da177e4 LT |
704 | if (res < 0) |
705 | break; | |
00a92642 | 706 | file->f_pos++; |
d1bacf9e BS |
707 | desc->cache_entry_index = i; |
708 | if (i < (array->size-1)) | |
709 | *desc->dir_cookie = array->array[i+1].cookie; | |
710 | else | |
711 | *desc->dir_cookie = array->last_cookie; | |
1da177e4 | 712 | } |
8cd51a0c TM |
713 | if (i == array->eof_index) |
714 | desc->eof = 1; | |
d1bacf9e BS |
715 | |
716 | nfs_readdir_release_array(desc->page); | |
717 | cache_page_release(desc); | |
1da177e4 LT |
718 | if (dentry != NULL) |
719 | dput(dentry); | |
1e7cb3dc CL |
720 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
721 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
722 | return res; |
723 | } | |
724 | ||
725 | /* | |
726 | * If we cannot find a cookie in our cache, we suspect that this is | |
727 | * because it points to a deleted file, so we ask the server to return | |
728 | * whatever it thinks is the next entry. We then feed this to filldir. | |
729 | * If all goes well, we should then be able to find our way round the | |
730 | * cache on the next call to readdir_search_pagecache(); | |
731 | * | |
732 | * NOTE: we cannot add the anonymous page to the pagecache because | |
733 | * the data it contains might not be page aligned. Besides, | |
734 | * we should already have a complete representation of the | |
735 | * directory in the page cache by the time we get here. | |
736 | */ | |
737 | static inline | |
738 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
739 | filldir_t filldir) | |
740 | { | |
1da177e4 LT |
741 | struct page *page = NULL; |
742 | int status; | |
d1bacf9e | 743 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 744 | |
1e7cb3dc CL |
745 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
746 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
747 | |
748 | page = alloc_page(GFP_HIGHUSER); | |
749 | if (!page) { | |
750 | status = -ENOMEM; | |
751 | goto out; | |
752 | } | |
d1bacf9e BS |
753 | |
754 | if (nfs_readdir_xdr_to_array(desc, page, inode) == -1) { | |
1da177e4 | 755 | status = -EIO; |
1da177e4 | 756 | goto out_release; |
d1bacf9e | 757 | } |
1da177e4 | 758 | |
baf57a09 | 759 | desc->page_index = 0; |
d1bacf9e | 760 | desc->page = page; |
1da177e4 LT |
761 | status = nfs_do_filldir(desc, dirent, filldir); |
762 | ||
1da177e4 | 763 | out: |
1e7cb3dc | 764 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 765 | __func__, status); |
1da177e4 LT |
766 | return status; |
767 | out_release: | |
d1bacf9e | 768 | cache_page_release(desc); |
1da177e4 LT |
769 | goto out; |
770 | } | |
771 | ||
00a92642 OG |
772 | /* The file offset position represents the dirent entry number. A |
773 | last cookie cache takes care of the common case of reading the | |
774 | whole directory. | |
1da177e4 LT |
775 | */ |
776 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
777 | { | |
01cce933 | 778 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
779 | struct inode *inode = dentry->d_inode; |
780 | nfs_readdir_descriptor_t my_desc, | |
781 | *desc = &my_desc; | |
aa49b4cf | 782 | int res = -ENOMEM; |
1da177e4 | 783 | |
6da24bc9 | 784 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
785 | dentry->d_parent->d_name.name, dentry->d_name.name, |
786 | (long long)filp->f_pos); | |
91d5b470 CL |
787 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
788 | ||
1da177e4 | 789 | /* |
00a92642 | 790 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 791 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
792 | * to either find the entry with the appropriate number or |
793 | * revalidate the cookie. | |
1da177e4 LT |
794 | */ |
795 | memset(desc, 0, sizeof(*desc)); | |
796 | ||
797 | desc->file = filp; | |
cd3758e3 | 798 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
1da177e4 LT |
799 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
800 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
801 | ||
565277f6 | 802 | nfs_block_sillyrename(dentry); |
1cda707d | 803 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
804 | if (res < 0) |
805 | goto out; | |
806 | ||
d1bacf9e | 807 | while (desc->eof != 1) { |
1da177e4 | 808 | res = readdir_search_pagecache(desc); |
00a92642 | 809 | |
1da177e4 LT |
810 | if (res == -EBADCOOKIE) { |
811 | /* This means either end of directory */ | |
d1bacf9e | 812 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
813 | /* Or that the server has 'lost' a cookie */ |
814 | res = uncached_readdir(desc, dirent, filldir); | |
815 | if (res >= 0) | |
816 | continue; | |
817 | } | |
818 | res = 0; | |
819 | break; | |
820 | } | |
821 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 822 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 823 | nfs_zap_caches(inode); |
baf57a09 | 824 | desc->page_index = 0; |
1da177e4 | 825 | desc->plus = 0; |
d1bacf9e | 826 | desc->eof = 0; |
1da177e4 LT |
827 | continue; |
828 | } | |
829 | if (res < 0) | |
830 | break; | |
831 | ||
832 | res = nfs_do_filldir(desc, dirent, filldir); | |
833 | if (res < 0) { | |
834 | res = 0; | |
835 | break; | |
836 | } | |
837 | } | |
fccca7fc | 838 | out: |
565277f6 | 839 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
840 | if (res > 0) |
841 | res = 0; | |
aa49b4cf | 842 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
843 | dentry->d_parent->d_name.name, dentry->d_name.name, |
844 | res); | |
845 | return res; | |
1da177e4 LT |
846 | } |
847 | ||
10afec90 | 848 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 849 | { |
b84e06c5 CL |
850 | struct dentry *dentry = filp->f_path.dentry; |
851 | struct inode *inode = dentry->d_inode; | |
852 | ||
6da24bc9 | 853 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
854 | dentry->d_parent->d_name.name, |
855 | dentry->d_name.name, | |
856 | offset, origin); | |
857 | ||
858 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
859 | switch (origin) { |
860 | case 1: | |
861 | offset += filp->f_pos; | |
862 | case 0: | |
863 | if (offset >= 0) | |
864 | break; | |
865 | default: | |
866 | offset = -EINVAL; | |
867 | goto out; | |
868 | } | |
869 | if (offset != filp->f_pos) { | |
870 | filp->f_pos = offset; | |
cd3758e3 | 871 | nfs_file_open_context(filp)->dir_cookie = 0; |
f0dd2136 TM |
872 | } |
873 | out: | |
b84e06c5 | 874 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
875 | return offset; |
876 | } | |
877 | ||
1da177e4 LT |
878 | /* |
879 | * All directory operations under NFS are synchronous, so fsync() | |
880 | * is a dummy operation. | |
881 | */ | |
7ea80859 | 882 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 883 | { |
7ea80859 CH |
884 | struct dentry *dentry = filp->f_path.dentry; |
885 | ||
6da24bc9 | 886 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
887 | dentry->d_parent->d_name.name, dentry->d_name.name, |
888 | datasync); | |
889 | ||
54917786 | 890 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
891 | return 0; |
892 | } | |
893 | ||
bfc69a45 TM |
894 | /** |
895 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
896 | * @dir - pointer to directory inode | |
897 | * | |
898 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
899 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
900 | * on the server that might have invalidated our dcache. | |
901 | * | |
902 | * The caller should be holding dir->i_lock | |
903 | */ | |
904 | void nfs_force_lookup_revalidate(struct inode *dir) | |
905 | { | |
011935a0 | 906 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
907 | } |
908 | ||
1da177e4 LT |
909 | /* |
910 | * A check for whether or not the parent directory has changed. | |
911 | * In the case it has, we assume that the dentries are untrustworthy | |
912 | * and may need to be looked up again. | |
913 | */ | |
c79ba787 | 914 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
915 | { |
916 | if (IS_ROOT(dentry)) | |
917 | return 1; | |
4eec952e TM |
918 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
919 | return 0; | |
f2c77f4e TM |
920 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
921 | return 0; | |
922 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
923 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
924 | return 0; | |
925 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
926 | return 0; | |
927 | return 1; | |
1da177e4 LT |
928 | } |
929 | ||
1d6757fb TM |
930 | /* |
931 | * Return the intent data that applies to this particular path component | |
932 | * | |
933 | * Note that the current set of intents only apply to the very last | |
934 | * component of the path. | |
935 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
936 | */ | |
937 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) | |
938 | { | |
939 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
940 | return 0; | |
941 | return nd->flags & mask; | |
942 | } | |
943 | ||
a12802ca TM |
944 | /* |
945 | * Use intent information to check whether or not we're going to do | |
946 | * an O_EXCL create using this path component. | |
947 | */ | |
948 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
949 | { | |
950 | if (NFS_PROTO(dir)->version == 2) | |
951 | return 0; | |
3516586a | 952 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
953 | } |
954 | ||
1d6757fb TM |
955 | /* |
956 | * Inode and filehandle revalidation for lookups. | |
957 | * | |
958 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
959 | * or if the intent information indicates that we're about to open this | |
960 | * particular file and the "nocto" mount flag is not set. | |
961 | * | |
962 | */ | |
1da177e4 LT |
963 | static inline |
964 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
965 | { | |
966 | struct nfs_server *server = NFS_SERVER(inode); | |
967 | ||
4e99a1ff TM |
968 | if (test_bit(NFS_INO_MOUNTPOINT, &NFS_I(inode)->flags)) |
969 | return 0; | |
1da177e4 | 970 | if (nd != NULL) { |
1da177e4 | 971 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 972 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
973 | goto out_force; |
974 | /* This is an open(2) */ | |
1d6757fb | 975 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
976 | !(server->flags & NFS_MOUNT_NOCTO) && |
977 | (S_ISREG(inode->i_mode) || | |
978 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 979 | goto out_force; |
4f48af45 | 980 | return 0; |
1da177e4 LT |
981 | } |
982 | return nfs_revalidate_inode(server, inode); | |
983 | out_force: | |
984 | return __nfs_revalidate_inode(server, inode); | |
985 | } | |
986 | ||
987 | /* | |
988 | * We judge how long we want to trust negative | |
989 | * dentries by looking at the parent inode mtime. | |
990 | * | |
991 | * If parent mtime has changed, we revalidate, else we wait for a | |
992 | * period corresponding to the parent's attribute cache timeout value. | |
993 | */ | |
994 | static inline | |
995 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
996 | struct nameidata *nd) | |
997 | { | |
1da177e4 | 998 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 999 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1000 | return 0; |
4eec952e TM |
1001 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1002 | return 1; | |
1da177e4 LT |
1003 | return !nfs_check_verifier(dir, dentry); |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * This is called every time the dcache has a lookup hit, | |
1008 | * and we should check whether we can really trust that | |
1009 | * lookup. | |
1010 | * | |
1011 | * NOTE! The hit can be a negative hit too, don't assume | |
1012 | * we have an inode! | |
1013 | * | |
1014 | * If the parent directory is seen to have changed, we throw out the | |
1015 | * cached dentry and do a new lookup. | |
1016 | */ | |
1017 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) | |
1018 | { | |
1019 | struct inode *dir; | |
1020 | struct inode *inode; | |
1021 | struct dentry *parent; | |
e1fb4d05 TM |
1022 | struct nfs_fh *fhandle = NULL; |
1023 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1024 | int error; |
1da177e4 LT |
1025 | |
1026 | parent = dget_parent(dentry); | |
1da177e4 | 1027 | dir = parent->d_inode; |
91d5b470 | 1028 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1029 | inode = dentry->d_inode; |
1030 | ||
1031 | if (!inode) { | |
1032 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1033 | goto out_bad; | |
1034 | goto out_valid; | |
1035 | } | |
1036 | ||
1037 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1038 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1039 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1040 | dentry->d_name.name); |
1da177e4 LT |
1041 | goto out_bad; |
1042 | } | |
1043 | ||
15860ab1 TM |
1044 | if (nfs_have_delegation(inode, FMODE_READ)) |
1045 | goto out_set_verifier; | |
1046 | ||
1da177e4 | 1047 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1048 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1049 | if (nfs_lookup_verify_inode(inode, nd)) |
1050 | goto out_zap_parent; | |
1051 | goto out_valid; | |
1052 | } | |
1053 | ||
1054 | if (NFS_STALE(inode)) | |
1055 | goto out_bad; | |
1056 | ||
e1fb4d05 TM |
1057 | error = -ENOMEM; |
1058 | fhandle = nfs_alloc_fhandle(); | |
1059 | fattr = nfs_alloc_fattr(); | |
1060 | if (fhandle == NULL || fattr == NULL) | |
1061 | goto out_error; | |
1062 | ||
1063 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); | |
1da177e4 LT |
1064 | if (error) |
1065 | goto out_bad; | |
e1fb4d05 | 1066 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1067 | goto out_bad; |
e1fb4d05 | 1068 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1069 | goto out_bad; |
1070 | ||
e1fb4d05 TM |
1071 | nfs_free_fattr(fattr); |
1072 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1073 | out_set_verifier: |
cf8ba45e | 1074 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1075 | out_valid: |
1da177e4 | 1076 | dput(parent); |
1e7cb3dc | 1077 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1078 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1079 | dentry->d_name.name); |
1da177e4 LT |
1080 | return 1; |
1081 | out_zap_parent: | |
1082 | nfs_zap_caches(dir); | |
1083 | out_bad: | |
a1643a92 | 1084 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1085 | if (inode && S_ISDIR(inode->i_mode)) { |
1086 | /* Purge readdir caches. */ | |
1087 | nfs_zap_caches(inode); | |
1088 | /* If we have submounts, don't unhash ! */ | |
1089 | if (have_submounts(dentry)) | |
1090 | goto out_valid; | |
d9e80b7d AV |
1091 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1092 | goto out_valid; | |
1da177e4 LT |
1093 | shrink_dcache_parent(dentry); |
1094 | } | |
1095 | d_drop(dentry); | |
e1fb4d05 TM |
1096 | nfs_free_fattr(fattr); |
1097 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1098 | dput(parent); |
1e7cb3dc | 1099 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1100 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1101 | dentry->d_name.name); |
1da177e4 | 1102 | return 0; |
e1fb4d05 TM |
1103 | out_error: |
1104 | nfs_free_fattr(fattr); | |
1105 | nfs_free_fhandle(fhandle); | |
1106 | dput(parent); | |
1107 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1108 | __func__, dentry->d_parent->d_name.name, | |
1109 | dentry->d_name.name, error); | |
1110 | return error; | |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | /* | |
1114 | * This is called from dput() when d_count is going to 0. | |
1115 | */ | |
1116 | static int nfs_dentry_delete(struct dentry *dentry) | |
1117 | { | |
1118 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1119 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1120 | dentry->d_flags); | |
1121 | ||
77f11192 TM |
1122 | /* Unhash any dentry with a stale inode */ |
1123 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1124 | return 1; | |
1125 | ||
1da177e4 LT |
1126 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1127 | /* Unhash it, so that ->d_iput() would be called */ | |
1128 | return 1; | |
1129 | } | |
1130 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1131 | /* Unhash it, so that ancestors of killed async unlink | |
1132 | * files will be cleaned up during umount */ | |
1133 | return 1; | |
1134 | } | |
1135 | return 0; | |
1136 | ||
1137 | } | |
1138 | ||
1b83d707 TM |
1139 | static void nfs_drop_nlink(struct inode *inode) |
1140 | { | |
1141 | spin_lock(&inode->i_lock); | |
1142 | if (inode->i_nlink > 0) | |
1143 | drop_nlink(inode); | |
1144 | spin_unlock(&inode->i_lock); | |
1145 | } | |
1146 | ||
1da177e4 LT |
1147 | /* |
1148 | * Called when the dentry loses inode. | |
1149 | * We use it to clean up silly-renamed files. | |
1150 | */ | |
1151 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1152 | { | |
83672d39 NB |
1153 | if (S_ISDIR(inode->i_mode)) |
1154 | /* drop any readdir cache as it could easily be old */ | |
1155 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1156 | ||
1da177e4 | 1157 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1158 | drop_nlink(inode); |
e4eff1a6 | 1159 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1160 | } |
1da177e4 LT |
1161 | iput(inode); |
1162 | } | |
1163 | ||
f786aa90 | 1164 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1165 | .d_revalidate = nfs_lookup_revalidate, |
1166 | .d_delete = nfs_dentry_delete, | |
1167 | .d_iput = nfs_dentry_iput, | |
1168 | }; | |
1169 | ||
1da177e4 LT |
1170 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1171 | { | |
1172 | struct dentry *res; | |
565277f6 | 1173 | struct dentry *parent; |
1da177e4 | 1174 | struct inode *inode = NULL; |
e1fb4d05 TM |
1175 | struct nfs_fh *fhandle = NULL; |
1176 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1177 | int error; |
1da177e4 LT |
1178 | |
1179 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1180 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1181 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1182 | |
1183 | res = ERR_PTR(-ENAMETOOLONG); | |
1184 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1185 | goto out; | |
1186 | ||
1da177e4 LT |
1187 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
1188 | ||
fd684071 TM |
1189 | /* |
1190 | * If we're doing an exclusive create, optimize away the lookup | |
1191 | * but don't hash the dentry. | |
1192 | */ | |
1193 | if (nfs_is_exclusive_create(dir, nd)) { | |
1194 | d_instantiate(dentry, NULL); | |
1195 | res = NULL; | |
fc0f684c | 1196 | goto out; |
fd684071 | 1197 | } |
1da177e4 | 1198 | |
e1fb4d05 TM |
1199 | res = ERR_PTR(-ENOMEM); |
1200 | fhandle = nfs_alloc_fhandle(); | |
1201 | fattr = nfs_alloc_fattr(); | |
1202 | if (fhandle == NULL || fattr == NULL) | |
1203 | goto out; | |
1204 | ||
565277f6 TM |
1205 | parent = dentry->d_parent; |
1206 | /* Protect against concurrent sillydeletes */ | |
1207 | nfs_block_sillyrename(parent); | |
e1fb4d05 | 1208 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1209 | if (error == -ENOENT) |
1210 | goto no_entry; | |
1211 | if (error < 0) { | |
1212 | res = ERR_PTR(error); | |
565277f6 | 1213 | goto out_unblock_sillyrename; |
1da177e4 | 1214 | } |
e1fb4d05 | 1215 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1216 | res = (struct dentry *)inode; |
1217 | if (IS_ERR(res)) | |
565277f6 | 1218 | goto out_unblock_sillyrename; |
54ceac45 | 1219 | |
1da177e4 | 1220 | no_entry: |
54ceac45 | 1221 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1222 | if (res != NULL) { |
1223 | if (IS_ERR(res)) | |
565277f6 | 1224 | goto out_unblock_sillyrename; |
1da177e4 | 1225 | dentry = res; |
9eaef27b | 1226 | } |
1da177e4 | 1227 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1228 | out_unblock_sillyrename: |
1229 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1230 | out: |
e1fb4d05 TM |
1231 | nfs_free_fattr(fattr); |
1232 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1233 | return res; |
1234 | } | |
1235 | ||
1236 | #ifdef CONFIG_NFS_V4 | |
1237 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1238 | ||
f786aa90 | 1239 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1240 | .d_revalidate = nfs_open_revalidate, |
1241 | .d_delete = nfs_dentry_delete, | |
1242 | .d_iput = nfs_dentry_iput, | |
1243 | }; | |
1244 | ||
1d6757fb TM |
1245 | /* |
1246 | * Use intent information to determine whether we need to substitute | |
1247 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1248 | */ | |
5584c306 | 1249 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1250 | { |
1d6757fb | 1251 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1252 | return 0; |
1253 | /* NFS does not (yet) have a stateful open for directories */ | |
1254 | if (nd->flags & LOOKUP_DIRECTORY) | |
1255 | return 0; | |
1256 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1257 | if (__mnt_is_readonly(nd->path.mnt) && |
1258 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1259 | return 0; |
1260 | return 1; | |
1261 | } | |
1262 | ||
cd9a1c0e TM |
1263 | static struct nfs_open_context *nameidata_to_nfs_open_context(struct dentry *dentry, struct nameidata *nd) |
1264 | { | |
1265 | struct path path = { | |
1266 | .mnt = nd->path.mnt, | |
1267 | .dentry = dentry, | |
1268 | }; | |
1269 | struct nfs_open_context *ctx; | |
1270 | struct rpc_cred *cred; | |
1271 | fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC); | |
1272 | ||
1273 | cred = rpc_lookup_cred(); | |
1274 | if (IS_ERR(cred)) | |
1275 | return ERR_CAST(cred); | |
1276 | ctx = alloc_nfs_open_context(&path, cred, fmode); | |
1277 | put_rpccred(cred); | |
1278 | if (ctx == NULL) | |
1279 | return ERR_PTR(-ENOMEM); | |
1280 | return ctx; | |
1281 | } | |
1282 | ||
1283 | static int do_open(struct inode *inode, struct file *filp) | |
1284 | { | |
1285 | nfs_fscache_set_inode_cookie(inode, filp); | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1290 | { | |
1291 | struct file *filp; | |
1292 | int ret = 0; | |
1293 | ||
1294 | /* If the open_intent is for execute, we have an extra check to make */ | |
1295 | if (ctx->mode & FMODE_EXEC) { | |
1296 | ret = nfs_may_open(ctx->path.dentry->d_inode, | |
1297 | ctx->cred, | |
1298 | nd->intent.open.flags); | |
1299 | if (ret < 0) | |
1300 | goto out; | |
1301 | } | |
1302 | filp = lookup_instantiate_filp(nd, ctx->path.dentry, do_open); | |
1303 | if (IS_ERR(filp)) | |
1304 | ret = PTR_ERR(filp); | |
1305 | else | |
1306 | nfs_file_set_open_context(filp, ctx); | |
1307 | out: | |
1308 | put_nfs_open_context(ctx); | |
1309 | return ret; | |
1310 | } | |
1311 | ||
1da177e4 LT |
1312 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1313 | { | |
cd9a1c0e TM |
1314 | struct nfs_open_context *ctx; |
1315 | struct iattr attr; | |
1da177e4 | 1316 | struct dentry *res = NULL; |
f46e0bd3 | 1317 | struct inode *inode; |
cd9a1c0e | 1318 | int open_flags; |
898f635c | 1319 | int err; |
1da177e4 | 1320 | |
1e7cb3dc CL |
1321 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1322 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1323 | ||
1da177e4 | 1324 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1325 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1326 | goto no_open; |
1327 | ||
1328 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1329 | res = ERR_PTR(-ENAMETOOLONG); | |
1330 | goto out; | |
1331 | } | |
1332 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; | |
1333 | ||
d4d9cdcb TM |
1334 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1335 | * the dentry. */ | |
3516586a | 1336 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1337 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1338 | goto out; |
1339 | } | |
1da177e4 | 1340 | |
cd9a1c0e TM |
1341 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1342 | res = ERR_CAST(ctx); | |
1343 | if (IS_ERR(ctx)) | |
1344 | goto out; | |
1345 | ||
1346 | open_flags = nd->intent.open.flags; | |
1347 | if (nd->flags & LOOKUP_CREATE) { | |
1348 | attr.ia_mode = nd->intent.open.create_mode; | |
1349 | attr.ia_valid = ATTR_MODE; | |
1350 | if (!IS_POSIXACL(dir)) | |
1351 | attr.ia_mode &= ~current_umask(); | |
1352 | } else { | |
898f635c | 1353 | open_flags &= ~(O_EXCL | O_CREAT); |
cd9a1c0e | 1354 | attr.ia_valid = 0; |
cd9a1c0e TM |
1355 | } |
1356 | ||
1da177e4 | 1357 | /* Open the file on the server */ |
f46e0bd3 | 1358 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1359 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1360 | if (IS_ERR(inode)) { |
1361 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1362 | put_nfs_open_context(ctx); |
f46e0bd3 | 1363 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1364 | /* Make a negative dentry */ |
1365 | case -ENOENT: | |
f46e0bd3 | 1366 | d_add(dentry, NULL); |
02a913a7 TM |
1367 | res = NULL; |
1368 | goto out; | |
1da177e4 | 1369 | /* This turned out not to be a regular file */ |
6f926b5b TM |
1370 | case -ENOTDIR: |
1371 | goto no_open; | |
1da177e4 LT |
1372 | case -ELOOP: |
1373 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1374 | goto no_open; | |
23ebbd9a | 1375 | /* case -EISDIR: */ |
1da177e4 LT |
1376 | /* case -EINVAL: */ |
1377 | default: | |
f46e0bd3 | 1378 | res = ERR_CAST(inode); |
1da177e4 LT |
1379 | goto out; |
1380 | } | |
cd9a1c0e | 1381 | } |
f46e0bd3 | 1382 | res = d_add_unique(dentry, inode); |
898f635c | 1383 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 TM |
1384 | if (res != NULL) { |
1385 | dput(ctx->path.dentry); | |
1386 | ctx->path.dentry = dget(res); | |
1da177e4 | 1387 | dentry = res; |
f46e0bd3 | 1388 | } |
898f635c TM |
1389 | err = nfs_intent_set_file(nd, ctx); |
1390 | if (err < 0) { | |
1391 | if (res != NULL) | |
1392 | dput(res); | |
1393 | return ERR_PTR(err); | |
1394 | } | |
1da177e4 | 1395 | out: |
f46e0bd3 | 1396 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1397 | return res; |
1398 | no_open: | |
1399 | return nfs_lookup(dir, dentry, nd); | |
1400 | } | |
1401 | ||
1402 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1403 | { | |
1404 | struct dentry *parent = NULL; | |
1405 | struct inode *inode = dentry->d_inode; | |
1406 | struct inode *dir; | |
b8d4cadd | 1407 | struct nfs_open_context *ctx; |
1da177e4 LT |
1408 | int openflags, ret = 0; |
1409 | ||
1f063d2c | 1410 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1411 | goto no_open; |
2b484297 | 1412 | |
1da177e4 LT |
1413 | parent = dget_parent(dentry); |
1414 | dir = parent->d_inode; | |
2b484297 | 1415 | |
1da177e4 LT |
1416 | /* We can't create new files in nfs_open_revalidate(), so we |
1417 | * optimize away revalidation of negative dentries. | |
1418 | */ | |
216d5d06 TM |
1419 | if (inode == NULL) { |
1420 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1421 | ret = 1; | |
1da177e4 | 1422 | goto out; |
216d5d06 TM |
1423 | } |
1424 | ||
1da177e4 LT |
1425 | /* NFS only supports OPEN on regular files */ |
1426 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1427 | goto no_open_dput; |
1da177e4 LT |
1428 | openflags = nd->intent.open.flags; |
1429 | /* We cannot do exclusive creation on a positive dentry */ | |
1430 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1431 | goto no_open_dput; |
1da177e4 | 1432 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1433 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 | 1434 | |
b8d4cadd TM |
1435 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1436 | ret = PTR_ERR(ctx); | |
1437 | if (IS_ERR(ctx)) | |
1438 | goto out; | |
1da177e4 | 1439 | /* |
1b1dcc1b | 1440 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1441 | * operations that change the directory. We therefore save the |
1442 | * change attribute *before* we do the RPC call. | |
1443 | */ | |
2b484297 | 1444 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, NULL); |
535918f1 TM |
1445 | if (IS_ERR(inode)) { |
1446 | ret = PTR_ERR(inode); | |
1447 | switch (ret) { | |
1448 | case -EPERM: | |
1449 | case -EACCES: | |
1450 | case -EDQUOT: | |
1451 | case -ENOSPC: | |
1452 | case -EROFS: | |
1453 | goto out_put_ctx; | |
1454 | default: | |
1455 | goto out_drop; | |
1456 | } | |
1457 | } | |
1458 | iput(inode); | |
898f635c | 1459 | if (inode != dentry->d_inode) |
535918f1 | 1460 | goto out_drop; |
898f635c TM |
1461 | |
1462 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1463 | ret = nfs_intent_set_file(nd, ctx); | |
1464 | if (ret >= 0) | |
1465 | ret = 1; | |
1da177e4 LT |
1466 | out: |
1467 | dput(parent); | |
1da177e4 | 1468 | return ret; |
535918f1 TM |
1469 | out_drop: |
1470 | d_drop(dentry); | |
1471 | ret = 0; | |
1472 | out_put_ctx: | |
1473 | put_nfs_open_context(ctx); | |
1474 | goto out; | |
1475 | ||
5584c306 | 1476 | no_open_dput: |
1da177e4 | 1477 | dput(parent); |
5584c306 | 1478 | no_open: |
1da177e4 LT |
1479 | return nfs_lookup_revalidate(dentry, nd); |
1480 | } | |
c0204fd2 TM |
1481 | |
1482 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, | |
1483 | struct nameidata *nd) | |
1484 | { | |
1485 | struct nfs_open_context *ctx = NULL; | |
1486 | struct iattr attr; | |
1487 | int error; | |
1488 | int open_flags = 0; | |
1489 | ||
1490 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1491 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1492 | ||
1493 | attr.ia_mode = mode; | |
1494 | attr.ia_valid = ATTR_MODE; | |
1495 | ||
1496 | if ((nd->flags & LOOKUP_CREATE) != 0) { | |
1497 | open_flags = nd->intent.open.flags; | |
1498 | ||
1499 | ctx = nameidata_to_nfs_open_context(dentry, nd); | |
1500 | error = PTR_ERR(ctx); | |
1501 | if (IS_ERR(ctx)) | |
898f635c | 1502 | goto out_err_drop; |
c0204fd2 TM |
1503 | } |
1504 | ||
1505 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1506 | if (error != 0) | |
1507 | goto out_put_ctx; | |
898f635c TM |
1508 | if (ctx != NULL) { |
1509 | error = nfs_intent_set_file(nd, ctx); | |
1510 | if (error < 0) | |
1511 | goto out_err; | |
1512 | } | |
c0204fd2 TM |
1513 | return 0; |
1514 | out_put_ctx: | |
1515 | if (ctx != NULL) | |
1516 | put_nfs_open_context(ctx); | |
898f635c | 1517 | out_err_drop: |
c0204fd2 | 1518 | d_drop(dentry); |
898f635c | 1519 | out_err: |
c0204fd2 TM |
1520 | return error; |
1521 | } | |
1522 | ||
1da177e4 LT |
1523 | #endif /* CONFIG_NFSV4 */ |
1524 | ||
1da177e4 LT |
1525 | /* |
1526 | * Code common to create, mkdir, and mknod. | |
1527 | */ | |
1528 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1529 | struct nfs_fattr *fattr) | |
1530 | { | |
fab728e1 TM |
1531 | struct dentry *parent = dget_parent(dentry); |
1532 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1533 | struct inode *inode; |
1534 | int error = -EACCES; | |
1535 | ||
fab728e1 TM |
1536 | d_drop(dentry); |
1537 | ||
1da177e4 LT |
1538 | /* We may have been initialized further down */ |
1539 | if (dentry->d_inode) | |
fab728e1 | 1540 | goto out; |
1da177e4 | 1541 | if (fhandle->size == 0) { |
1da177e4 LT |
1542 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1543 | if (error) | |
fab728e1 | 1544 | goto out_error; |
1da177e4 | 1545 | } |
5724ab37 | 1546 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1547 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1548 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1549 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1550 | if (error < 0) |
fab728e1 | 1551 | goto out_error; |
1da177e4 | 1552 | } |
1da177e4 | 1553 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1554 | error = PTR_ERR(inode); |
1555 | if (IS_ERR(inode)) | |
fab728e1 TM |
1556 | goto out_error; |
1557 | d_add(dentry, inode); | |
1558 | out: | |
1559 | dput(parent); | |
1da177e4 | 1560 | return 0; |
fab728e1 TM |
1561 | out_error: |
1562 | nfs_mark_for_revalidate(dir); | |
1563 | dput(parent); | |
1564 | return error; | |
1da177e4 LT |
1565 | } |
1566 | ||
1567 | /* | |
1568 | * Following a failed create operation, we drop the dentry rather | |
1569 | * than retain a negative dentry. This avoids a problem in the event | |
1570 | * that the operation succeeded on the server, but an error in the | |
1571 | * reply path made it appear to have failed. | |
1572 | */ | |
1573 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1574 | struct nameidata *nd) | |
1575 | { | |
1576 | struct iattr attr; | |
1577 | int error; | |
1da177e4 | 1578 | |
1e7cb3dc CL |
1579 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1580 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1581 | |
1582 | attr.ia_mode = mode; | |
1583 | attr.ia_valid = ATTR_MODE; | |
1584 | ||
c0204fd2 | 1585 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, 0, NULL); |
1da177e4 LT |
1586 | if (error != 0) |
1587 | goto out_err; | |
1da177e4 LT |
1588 | return 0; |
1589 | out_err: | |
1da177e4 LT |
1590 | d_drop(dentry); |
1591 | return error; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * See comments for nfs_proc_create regarding failed operations. | |
1596 | */ | |
1597 | static int | |
1598 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1599 | { | |
1600 | struct iattr attr; | |
1601 | int status; | |
1602 | ||
1e7cb3dc CL |
1603 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1604 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1605 | |
1606 | if (!new_valid_dev(rdev)) | |
1607 | return -EINVAL; | |
1608 | ||
1609 | attr.ia_mode = mode; | |
1610 | attr.ia_valid = ATTR_MODE; | |
1611 | ||
1da177e4 | 1612 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1613 | if (status != 0) |
1614 | goto out_err; | |
1da177e4 LT |
1615 | return 0; |
1616 | out_err: | |
1da177e4 LT |
1617 | d_drop(dentry); |
1618 | return status; | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * See comments for nfs_proc_create regarding failed operations. | |
1623 | */ | |
1624 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1625 | { | |
1626 | struct iattr attr; | |
1627 | int error; | |
1628 | ||
1e7cb3dc CL |
1629 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1630 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1631 | |
1632 | attr.ia_valid = ATTR_MODE; | |
1633 | attr.ia_mode = mode | S_IFDIR; | |
1634 | ||
1da177e4 | 1635 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1636 | if (error != 0) |
1637 | goto out_err; | |
1da177e4 LT |
1638 | return 0; |
1639 | out_err: | |
1640 | d_drop(dentry); | |
1da177e4 LT |
1641 | return error; |
1642 | } | |
1643 | ||
d45b9d8b TM |
1644 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1645 | { | |
1646 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1647 | d_delete(dentry); | |
1648 | } | |
1649 | ||
1da177e4 LT |
1650 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1651 | { | |
1652 | int error; | |
1653 | ||
1e7cb3dc CL |
1654 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1655 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1656 | |
1da177e4 LT |
1657 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1658 | /* Ensure the VFS deletes this inode */ | |
1659 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1660 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1661 | else if (error == -ENOENT) |
1662 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1663 | |
1664 | return error; | |
1665 | } | |
1666 | ||
1da177e4 LT |
1667 | /* |
1668 | * Remove a file after making sure there are no pending writes, | |
1669 | * and after checking that the file has only one user. | |
1670 | * | |
1671 | * We invalidate the attribute cache and free the inode prior to the operation | |
1672 | * to avoid possible races if the server reuses the inode. | |
1673 | */ | |
1674 | static int nfs_safe_remove(struct dentry *dentry) | |
1675 | { | |
1676 | struct inode *dir = dentry->d_parent->d_inode; | |
1677 | struct inode *inode = dentry->d_inode; | |
1678 | int error = -EBUSY; | |
1679 | ||
1680 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1681 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1682 | ||
1683 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1684 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1685 | error = 0; | |
1686 | goto out; | |
1687 | } | |
1688 | ||
1da177e4 | 1689 | if (inode != NULL) { |
cae7a073 | 1690 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1691 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1692 | /* The VFS may want to delete this inode */ | |
1693 | if (error == 0) | |
1b83d707 | 1694 | nfs_drop_nlink(inode); |
5ba7cc48 | 1695 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1696 | } else |
1697 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1698 | if (error == -ENOENT) |
1699 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1700 | out: |
1701 | return error; | |
1702 | } | |
1703 | ||
1704 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1705 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1706 | * | |
1707 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1708 | */ | |
1709 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1710 | { | |
1711 | int error; | |
1712 | int need_rehash = 0; | |
1713 | ||
1714 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1715 | dir->i_ino, dentry->d_name.name); | |
1716 | ||
1da177e4 LT |
1717 | spin_lock(&dcache_lock); |
1718 | spin_lock(&dentry->d_lock); | |
1719 | if (atomic_read(&dentry->d_count) > 1) { | |
1720 | spin_unlock(&dentry->d_lock); | |
1721 | spin_unlock(&dcache_lock); | |
ccfeb506 TM |
1722 | /* Start asynchronous writeout of the inode */ |
1723 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1724 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1725 | return error; |
1726 | } | |
1727 | if (!d_unhashed(dentry)) { | |
1728 | __d_drop(dentry); | |
1729 | need_rehash = 1; | |
1730 | } | |
1731 | spin_unlock(&dentry->d_lock); | |
1732 | spin_unlock(&dcache_lock); | |
1733 | error = nfs_safe_remove(dentry); | |
d45b9d8b | 1734 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1735 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1736 | } else if (need_rehash) | |
1737 | d_rehash(dentry); | |
1da177e4 LT |
1738 | return error; |
1739 | } | |
1740 | ||
873101b3 CL |
1741 | /* |
1742 | * To create a symbolic link, most file systems instantiate a new inode, | |
1743 | * add a page to it containing the path, then write it out to the disk | |
1744 | * using prepare_write/commit_write. | |
1745 | * | |
1746 | * Unfortunately the NFS client can't create the in-core inode first | |
1747 | * because it needs a file handle to create an in-core inode (see | |
1748 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1749 | * symlink request has completed on the server. | |
1750 | * | |
1751 | * So instead we allocate a raw page, copy the symname into it, then do | |
1752 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1753 | * now have a new file handle and can instantiate an in-core NFS inode | |
1754 | * and move the raw page into its mapping. | |
1755 | */ | |
1756 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1757 | { |
873101b3 CL |
1758 | struct pagevec lru_pvec; |
1759 | struct page *page; | |
1760 | char *kaddr; | |
1da177e4 | 1761 | struct iattr attr; |
873101b3 | 1762 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1763 | int error; |
1764 | ||
1765 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1766 | dir->i_ino, dentry->d_name.name, symname); | |
1767 | ||
873101b3 CL |
1768 | if (pathlen > PAGE_SIZE) |
1769 | return -ENAMETOOLONG; | |
1da177e4 | 1770 | |
873101b3 CL |
1771 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1772 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1773 | |
83d93f22 | 1774 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1775 | if (!page) |
873101b3 | 1776 | return -ENOMEM; |
873101b3 CL |
1777 | |
1778 | kaddr = kmap_atomic(page, KM_USER0); | |
1779 | memcpy(kaddr, symname, pathlen); | |
1780 | if (pathlen < PAGE_SIZE) | |
1781 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1782 | kunmap_atomic(kaddr, KM_USER0); | |
1783 | ||
94a6d753 | 1784 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1785 | if (error != 0) { |
1786 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1787 | dir->i_sb->s_id, dir->i_ino, | |
1788 | dentry->d_name.name, symname, error); | |
1da177e4 | 1789 | d_drop(dentry); |
873101b3 | 1790 | __free_page(page); |
873101b3 CL |
1791 | return error; |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * No big deal if we can't add this page to the page cache here. | |
1796 | * READLINK will get the missing page from the server if needed. | |
1797 | */ | |
1798 | pagevec_init(&lru_pvec, 0); | |
1799 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1800 | GFP_KERNEL)) { | |
39cf8a13 | 1801 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1802 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1803 | SetPageUptodate(page); |
1804 | unlock_page(page); | |
1805 | } else | |
1806 | __free_page(page); | |
1807 | ||
873101b3 | 1808 | return 0; |
1da177e4 LT |
1809 | } |
1810 | ||
1811 | static int | |
1812 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1813 | { | |
1814 | struct inode *inode = old_dentry->d_inode; | |
1815 | int error; | |
1816 | ||
1817 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1818 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1819 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1820 | ||
9a3936aa TM |
1821 | nfs_inode_return_delegation(inode); |
1822 | ||
9697d234 | 1823 | d_drop(dentry); |
1da177e4 | 1824 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1825 | if (error == 0) { |
7de9c6ee | 1826 | ihold(inode); |
9697d234 | 1827 | d_add(dentry, inode); |
cf809556 | 1828 | } |
1da177e4 LT |
1829 | return error; |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * RENAME | |
1834 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1835 | * different file handle for the same inode after a rename (e.g. when | |
1836 | * moving to a different directory). A fail-safe method to do so would | |
1837 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1838 | * rename the old file using the sillyrename stuff. This way, the original | |
1839 | * file in old_dir will go away when the last process iput()s the inode. | |
1840 | * | |
1841 | * FIXED. | |
1842 | * | |
1843 | * It actually works quite well. One needs to have the possibility for | |
1844 | * at least one ".nfs..." file in each directory the file ever gets | |
1845 | * moved or linked to which happens automagically with the new | |
1846 | * implementation that only depends on the dcache stuff instead of | |
1847 | * using the inode layer | |
1848 | * | |
1849 | * Unfortunately, things are a little more complicated than indicated | |
1850 | * above. For a cross-directory move, we want to make sure we can get | |
1851 | * rid of the old inode after the operation. This means there must be | |
1852 | * no pending writes (if it's a file), and the use count must be 1. | |
1853 | * If these conditions are met, we can drop the dentries before doing | |
1854 | * the rename. | |
1855 | */ | |
1856 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1857 | struct inode *new_dir, struct dentry *new_dentry) | |
1858 | { | |
1859 | struct inode *old_inode = old_dentry->d_inode; | |
1860 | struct inode *new_inode = new_dentry->d_inode; | |
1861 | struct dentry *dentry = NULL, *rehash = NULL; | |
1862 | int error = -EBUSY; | |
1863 | ||
1da177e4 LT |
1864 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1865 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1866 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
1867 | atomic_read(&new_dentry->d_count)); | |
1868 | ||
1869 | /* | |
28f79a1a MS |
1870 | * For non-directories, check whether the target is busy and if so, |
1871 | * make a copy of the dentry and then do a silly-rename. If the | |
1872 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1873 | * the new target. | |
1da177e4 | 1874 | */ |
27226104 MS |
1875 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1876 | /* | |
1877 | * To prevent any new references to the target during the | |
1878 | * rename, we unhash the dentry in advance. | |
1879 | */ | |
1880 | if (!d_unhashed(new_dentry)) { | |
1881 | d_drop(new_dentry); | |
1882 | rehash = new_dentry; | |
1883 | } | |
1da177e4 | 1884 | |
27226104 MS |
1885 | if (atomic_read(&new_dentry->d_count) > 2) { |
1886 | int err; | |
1887 | ||
1888 | /* copy the target dentry's name */ | |
1889 | dentry = d_alloc(new_dentry->d_parent, | |
1890 | &new_dentry->d_name); | |
1891 | if (!dentry) | |
1892 | goto out; | |
1893 | ||
1894 | /* silly-rename the existing target ... */ | |
1895 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1896 | if (err) |
27226104 | 1897 | goto out; |
24e93025 MS |
1898 | |
1899 | new_dentry = dentry; | |
56335936 | 1900 | rehash = NULL; |
24e93025 | 1901 | new_inode = NULL; |
27226104 | 1902 | } |
b1e4adf4 | 1903 | } |
1da177e4 | 1904 | |
cae7a073 | 1905 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1906 | if (new_inode != NULL) |
24174119 | 1907 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1908 | |
1da177e4 LT |
1909 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1910 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1911 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1912 | out: |
1913 | if (rehash) | |
1914 | d_rehash(rehash); | |
1915 | if (!error) { | |
b1e4adf4 TM |
1916 | if (new_inode != NULL) |
1917 | nfs_drop_nlink(new_inode); | |
349457cc | 1918 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1919 | nfs_set_verifier(new_dentry, |
1920 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1921 | } else if (error == -ENOENT) |
1922 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1923 | |
1924 | /* new dentry created? */ | |
1925 | if (dentry) | |
1926 | dput(dentry); | |
1da177e4 LT |
1927 | return error; |
1928 | } | |
1929 | ||
cfcea3e8 TM |
1930 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1931 | static LIST_HEAD(nfs_access_lru_list); | |
1932 | static atomic_long_t nfs_access_nr_entries; | |
1933 | ||
1c3c07e9 TM |
1934 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1935 | { | |
1936 | put_rpccred(entry->cred); | |
1937 | kfree(entry); | |
cfcea3e8 TM |
1938 | smp_mb__before_atomic_dec(); |
1939 | atomic_long_dec(&nfs_access_nr_entries); | |
1940 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1941 | } |
1942 | ||
1a81bb8a TM |
1943 | static void nfs_access_free_list(struct list_head *head) |
1944 | { | |
1945 | struct nfs_access_entry *cache; | |
1946 | ||
1947 | while (!list_empty(head)) { | |
1948 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1949 | list_del(&cache->lru); | |
1950 | nfs_access_free_entry(cache); | |
1951 | } | |
1952 | } | |
1953 | ||
7f8275d0 | 1954 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
1955 | { |
1956 | LIST_HEAD(head); | |
aa510da5 | 1957 | struct nfs_inode *nfsi, *next; |
979df72e TM |
1958 | struct nfs_access_entry *cache; |
1959 | ||
61d5eb29 TM |
1960 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1961 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1962 | |
a50f7951 | 1963 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1964 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1965 | struct inode *inode; |
1966 | ||
1967 | if (nr_to_scan-- == 0) | |
1968 | break; | |
9c7e7e23 | 1969 | inode = &nfsi->vfs_inode; |
979df72e TM |
1970 | spin_lock(&inode->i_lock); |
1971 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1972 | goto remove_lru_entry; | |
1973 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1974 | struct nfs_access_entry, lru); | |
1975 | list_move(&cache->lru, &head); | |
1976 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1977 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1978 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1979 | &nfs_access_lru_list); | |
1980 | else { | |
1981 | remove_lru_entry: | |
1982 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1983 | smp_mb__before_clear_bit(); |
979df72e | 1984 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1985 | smp_mb__after_clear_bit(); |
979df72e | 1986 | } |
59844a9b | 1987 | spin_unlock(&inode->i_lock); |
979df72e TM |
1988 | } |
1989 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1990 | nfs_access_free_list(&head); |
979df72e TM |
1991 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1992 | } | |
1993 | ||
1a81bb8a | 1994 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1995 | { |
1c3c07e9 | 1996 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1997 | struct rb_node *n; |
1c3c07e9 TM |
1998 | struct nfs_access_entry *entry; |
1999 | ||
2000 | /* Unhook entries from the cache */ | |
2001 | while ((n = rb_first(root_node)) != NULL) { | |
2002 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2003 | rb_erase(n, root_node); | |
1a81bb8a | 2004 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2005 | } |
2006 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2007 | } |
2008 | ||
1c3c07e9 | 2009 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2010 | { |
1a81bb8a TM |
2011 | LIST_HEAD(head); |
2012 | ||
2013 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2014 | return; | |
cfcea3e8 | 2015 | /* Remove from global LRU init */ |
1a81bb8a TM |
2016 | spin_lock(&nfs_access_lru_lock); |
2017 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2018 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2019 | |
1c3c07e9 | 2020 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2021 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2022 | spin_unlock(&inode->i_lock); | |
2023 | spin_unlock(&nfs_access_lru_lock); | |
2024 | nfs_access_free_list(&head); | |
1c3c07e9 | 2025 | } |
1da177e4 | 2026 | |
1c3c07e9 TM |
2027 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2028 | { | |
2029 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2030 | struct nfs_access_entry *entry; | |
2031 | ||
2032 | while (n != NULL) { | |
2033 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2034 | ||
2035 | if (cred < entry->cred) | |
2036 | n = n->rb_left; | |
2037 | else if (cred > entry->cred) | |
2038 | n = n->rb_right; | |
2039 | else | |
2040 | return entry; | |
1da177e4 | 2041 | } |
1c3c07e9 TM |
2042 | return NULL; |
2043 | } | |
2044 | ||
af22f94a | 2045 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2046 | { |
2047 | struct nfs_inode *nfsi = NFS_I(inode); | |
2048 | struct nfs_access_entry *cache; | |
2049 | int err = -ENOENT; | |
2050 | ||
dc59250c | 2051 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2052 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2053 | goto out_zap; | |
2054 | cache = nfs_access_search_rbtree(inode, cred); | |
2055 | if (cache == NULL) | |
2056 | goto out; | |
b4d2314b | 2057 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2058 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2059 | goto out_stale; |
2060 | res->jiffies = cache->jiffies; | |
2061 | res->cred = cache->cred; | |
2062 | res->mask = cache->mask; | |
cfcea3e8 | 2063 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2064 | err = 0; |
2065 | out: | |
2066 | spin_unlock(&inode->i_lock); | |
2067 | return err; | |
2068 | out_stale: | |
2069 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2070 | list_del(&cache->lru); |
1c3c07e9 TM |
2071 | spin_unlock(&inode->i_lock); |
2072 | nfs_access_free_entry(cache); | |
2073 | return -ENOENT; | |
2074 | out_zap: | |
1a81bb8a TM |
2075 | spin_unlock(&inode->i_lock); |
2076 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2077 | return -ENOENT; |
2078 | } | |
2079 | ||
2080 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2081 | { | |
cfcea3e8 TM |
2082 | struct nfs_inode *nfsi = NFS_I(inode); |
2083 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2084 | struct rb_node **p = &root_node->rb_node; |
2085 | struct rb_node *parent = NULL; | |
2086 | struct nfs_access_entry *entry; | |
2087 | ||
2088 | spin_lock(&inode->i_lock); | |
2089 | while (*p != NULL) { | |
2090 | parent = *p; | |
2091 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2092 | ||
2093 | if (set->cred < entry->cred) | |
2094 | p = &parent->rb_left; | |
2095 | else if (set->cred > entry->cred) | |
2096 | p = &parent->rb_right; | |
2097 | else | |
2098 | goto found; | |
2099 | } | |
2100 | rb_link_node(&set->rb_node, parent, p); | |
2101 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2102 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2103 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2104 | return; |
2105 | found: | |
2106 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2107 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2108 | list_del(&entry->lru); | |
1c3c07e9 TM |
2109 | spin_unlock(&inode->i_lock); |
2110 | nfs_access_free_entry(entry); | |
2111 | } | |
2112 | ||
af22f94a | 2113 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2114 | { |
2115 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2116 | if (cache == NULL) | |
2117 | return; | |
2118 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2119 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2120 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2121 | cache->mask = set->mask; |
1c3c07e9 TM |
2122 | |
2123 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2124 | |
2125 | /* Update accounting */ | |
2126 | smp_mb__before_atomic_inc(); | |
2127 | atomic_long_inc(&nfs_access_nr_entries); | |
2128 | smp_mb__after_atomic_inc(); | |
2129 | ||
2130 | /* Add inode to global LRU list */ | |
1a81bb8a | 2131 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2132 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2133 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2134 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2135 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2136 | spin_unlock(&nfs_access_lru_lock); |
2137 | } | |
1da177e4 LT |
2138 | } |
2139 | ||
2140 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2141 | { | |
2142 | struct nfs_access_entry cache; | |
2143 | int status; | |
2144 | ||
2145 | status = nfs_access_get_cached(inode, cred, &cache); | |
2146 | if (status == 0) | |
2147 | goto out; | |
2148 | ||
2149 | /* Be clever: ask server to check for all possible rights */ | |
2150 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2151 | cache.cred = cred; | |
2152 | cache.jiffies = jiffies; | |
2153 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2154 | if (status != 0) { |
2155 | if (status == -ESTALE) { | |
2156 | nfs_zap_caches(inode); | |
2157 | if (!S_ISDIR(inode->i_mode)) | |
2158 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2159 | } | |
1da177e4 | 2160 | return status; |
a71ee337 | 2161 | } |
1da177e4 LT |
2162 | nfs_access_add_cache(inode, &cache); |
2163 | out: | |
e6305c43 | 2164 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2165 | return 0; |
2166 | return -EACCES; | |
2167 | } | |
2168 | ||
af22f94a TM |
2169 | static int nfs_open_permission_mask(int openflags) |
2170 | { | |
2171 | int mask = 0; | |
2172 | ||
2173 | if (openflags & FMODE_READ) | |
2174 | mask |= MAY_READ; | |
2175 | if (openflags & FMODE_WRITE) | |
2176 | mask |= MAY_WRITE; | |
2177 | if (openflags & FMODE_EXEC) | |
2178 | mask |= MAY_EXEC; | |
2179 | return mask; | |
2180 | } | |
2181 | ||
2182 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2183 | { | |
2184 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2185 | } | |
2186 | ||
e6305c43 | 2187 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2188 | { |
2189 | struct rpc_cred *cred; | |
2190 | int res = 0; | |
2191 | ||
91d5b470 CL |
2192 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2193 | ||
e6305c43 | 2194 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2195 | goto out; |
2196 | /* Is this sys_access() ? */ | |
9cfcac81 | 2197 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2198 | goto force_lookup; |
2199 | ||
2200 | switch (inode->i_mode & S_IFMT) { | |
2201 | case S_IFLNK: | |
2202 | goto out; | |
2203 | case S_IFREG: | |
2204 | /* NFSv4 has atomic_open... */ | |
2205 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2206 | && (mask & MAY_OPEN) |
2207 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2208 | goto out; |
2209 | break; | |
2210 | case S_IFDIR: | |
2211 | /* | |
2212 | * Optimize away all write operations, since the server | |
2213 | * will check permissions when we perform the op. | |
2214 | */ | |
2215 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2216 | goto out; | |
2217 | } | |
2218 | ||
2219 | force_lookup: | |
1da177e4 LT |
2220 | if (!NFS_PROTO(inode)->access) |
2221 | goto out_notsup; | |
2222 | ||
98a8e323 | 2223 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2224 | if (!IS_ERR(cred)) { |
2225 | res = nfs_do_access(inode, cred, mask); | |
2226 | put_rpccred(cred); | |
2227 | } else | |
2228 | res = PTR_ERR(cred); | |
1da177e4 | 2229 | out: |
f696a365 MS |
2230 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2231 | res = -EACCES; | |
2232 | ||
1e7cb3dc CL |
2233 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2234 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2235 | return res; |
2236 | out_notsup: | |
2237 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2238 | if (res == 0) | |
2239 | res = generic_permission(inode, mask, NULL); | |
1e7cb3dc | 2240 | goto out; |
1da177e4 LT |
2241 | } |
2242 | ||
2243 | /* | |
2244 | * Local variables: | |
2245 | * version-control: t | |
2246 | * kept-new-versions: 5 | |
2247 | * End: | |
2248 | */ |