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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> |
64c2ce8b | 37 | #include <linux/xattr.h> |
1da177e4 LT |
38 | |
39 | #include "delegation.h" | |
91d5b470 | 40 | #include "iostat.h" |
4c30d56e | 41 | #include "internal.h" |
cd9a1c0e | 42 | #include "fscache.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | /* #define NFS_DEBUG_VERBOSE 1 */ |
45 | ||
46 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 47 | static int nfs_closedir(struct inode *, struct file *); |
1da177e4 LT |
48 | static int nfs_readdir(struct file *, void *, filldir_t); |
49 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
50 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); | |
51 | static int nfs_mkdir(struct inode *, struct dentry *, int); | |
52 | static int nfs_rmdir(struct inode *, struct dentry *); | |
53 | static int nfs_unlink(struct inode *, struct dentry *); | |
54 | static int nfs_symlink(struct inode *, struct dentry *, const char *); | |
55 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); | |
56 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); | |
57 | static int nfs_rename(struct inode *, struct dentry *, | |
58 | struct inode *, struct dentry *); | |
7ea80859 | 59 | static int nfs_fsync_dir(struct file *, int); |
f0dd2136 | 60 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 61 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 62 | |
4b6f5d20 | 63 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 64 | .llseek = nfs_llseek_dir, |
1da177e4 LT |
65 | .read = generic_read_dir, |
66 | .readdir = nfs_readdir, | |
67 | .open = nfs_opendir, | |
480c2006 | 68 | .release = nfs_closedir, |
1da177e4 LT |
69 | .fsync = nfs_fsync_dir, |
70 | }; | |
71 | ||
92e1d5be | 72 | const struct inode_operations nfs_dir_inode_operations = { |
1da177e4 LT |
73 | .create = nfs_create, |
74 | .lookup = nfs_lookup, | |
75 | .link = nfs_link, | |
76 | .unlink = nfs_unlink, | |
77 | .symlink = nfs_symlink, | |
78 | .mkdir = nfs_mkdir, | |
79 | .rmdir = nfs_rmdir, | |
80 | .mknod = nfs_mknod, | |
81 | .rename = nfs_rename, | |
82 | .permission = nfs_permission, | |
83 | .getattr = nfs_getattr, | |
84 | .setattr = nfs_setattr, | |
85 | }; | |
86 | ||
11de3b11 TM |
87 | const struct address_space_operations nfs_dir_aops = { |
88 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
89 | }; |
90 | ||
b7fa0554 | 91 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 92 | const struct inode_operations nfs3_dir_inode_operations = { |
b7fa0554 AG |
93 | .create = nfs_create, |
94 | .lookup = nfs_lookup, | |
95 | .link = nfs_link, | |
96 | .unlink = nfs_unlink, | |
97 | .symlink = nfs_symlink, | |
98 | .mkdir = nfs_mkdir, | |
99 | .rmdir = nfs_rmdir, | |
100 | .mknod = nfs_mknod, | |
101 | .rename = nfs_rename, | |
102 | .permission = nfs_permission, | |
103 | .getattr = nfs_getattr, | |
104 | .setattr = nfs_setattr, | |
105 | .listxattr = nfs3_listxattr, | |
106 | .getxattr = nfs3_getxattr, | |
107 | .setxattr = nfs3_setxattr, | |
108 | .removexattr = nfs3_removexattr, | |
109 | }; | |
110 | #endif /* CONFIG_NFS_V3 */ | |
111 | ||
1da177e4 LT |
112 | #ifdef CONFIG_NFS_V4 |
113 | ||
114 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
c0204fd2 | 115 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd); |
92e1d5be | 116 | const struct inode_operations nfs4_dir_inode_operations = { |
c0204fd2 | 117 | .create = nfs_open_create, |
1da177e4 LT |
118 | .lookup = nfs_atomic_lookup, |
119 | .link = nfs_link, | |
120 | .unlink = nfs_unlink, | |
121 | .symlink = nfs_symlink, | |
122 | .mkdir = nfs_mkdir, | |
123 | .rmdir = nfs_rmdir, | |
124 | .mknod = nfs_mknod, | |
125 | .rename = nfs_rename, | |
126 | .permission = nfs_permission, | |
127 | .getattr = nfs_getattr, | |
128 | .setattr = nfs_setattr, | |
64c2ce8b AK |
129 | .getxattr = generic_getxattr, |
130 | .setxattr = generic_setxattr, | |
131 | .listxattr = generic_listxattr, | |
132 | .removexattr = generic_removexattr, | |
1da177e4 LT |
133 | }; |
134 | ||
135 | #endif /* CONFIG_NFS_V4 */ | |
136 | ||
480c2006 BS |
137 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct rpc_cred *cred) |
138 | { | |
139 | struct nfs_open_dir_context *ctx; | |
140 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
141 | if (ctx != NULL) { | |
8ef2ce3e | 142 | ctx->duped = 0; |
480c2006 | 143 | ctx->dir_cookie = 0; |
8ef2ce3e | 144 | ctx->dup_cookie = 0; |
480c2006 BS |
145 | ctx->cred = get_rpccred(cred); |
146 | } else | |
147 | ctx = ERR_PTR(-ENOMEM); | |
148 | return ctx; | |
149 | } | |
150 | ||
151 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
152 | { | |
153 | put_rpccred(ctx->cred); | |
154 | kfree(ctx); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * Open file | |
159 | */ | |
160 | static int | |
161 | nfs_opendir(struct inode *inode, struct file *filp) | |
162 | { | |
480c2006 BS |
163 | int res = 0; |
164 | struct nfs_open_dir_context *ctx; | |
165 | struct rpc_cred *cred; | |
1da177e4 | 166 | |
6da24bc9 | 167 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
168 | filp->f_path.dentry->d_parent->d_name.name, |
169 | filp->f_path.dentry->d_name.name); | |
170 | ||
171 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 172 | |
480c2006 BS |
173 | cred = rpc_lookup_cred(); |
174 | if (IS_ERR(cred)) | |
175 | return PTR_ERR(cred); | |
176 | ctx = alloc_nfs_open_dir_context(cred); | |
177 | if (IS_ERR(ctx)) { | |
178 | res = PTR_ERR(ctx); | |
179 | goto out; | |
180 | } | |
181 | filp->private_data = ctx; | |
f5a73672 NB |
182 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
183 | /* This is a mountpoint, so d_revalidate will never | |
184 | * have been called, so we need to refresh the | |
185 | * inode (for close-open consistency) ourselves. | |
186 | */ | |
187 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
188 | } | |
480c2006 BS |
189 | out: |
190 | put_rpccred(cred); | |
1da177e4 LT |
191 | return res; |
192 | } | |
193 | ||
480c2006 BS |
194 | static int |
195 | nfs_closedir(struct inode *inode, struct file *filp) | |
196 | { | |
197 | put_nfs_open_dir_context(filp->private_data); | |
198 | return 0; | |
199 | } | |
200 | ||
d1bacf9e BS |
201 | struct nfs_cache_array_entry { |
202 | u64 cookie; | |
203 | u64 ino; | |
204 | struct qstr string; | |
0b26a0bf | 205 | unsigned char d_type; |
d1bacf9e BS |
206 | }; |
207 | ||
208 | struct nfs_cache_array { | |
209 | unsigned int size; | |
210 | int eof_index; | |
211 | u64 last_cookie; | |
212 | struct nfs_cache_array_entry array[0]; | |
213 | }; | |
214 | ||
573c4e1e | 215 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
216 | typedef struct { |
217 | struct file *file; | |
218 | struct page *page; | |
219 | unsigned long page_index; | |
f0dd2136 | 220 | u64 *dir_cookie; |
0aded708 | 221 | u64 last_cookie; |
f0dd2136 | 222 | loff_t current_index; |
1da177e4 | 223 | decode_dirent_t decode; |
d1bacf9e | 224 | |
1f4eab7e | 225 | unsigned long timestamp; |
4704f0e2 | 226 | unsigned long gencount; |
d1bacf9e BS |
227 | unsigned int cache_entry_index; |
228 | unsigned int plus:1; | |
229 | unsigned int eof:1; | |
1da177e4 LT |
230 | } nfs_readdir_descriptor_t; |
231 | ||
d1bacf9e BS |
232 | /* |
233 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
234 | */ |
235 | static | |
d1bacf9e BS |
236 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
237 | { | |
8cd51a0c | 238 | void *ptr; |
d1bacf9e BS |
239 | if (page == NULL) |
240 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
241 | ptr = kmap(page); |
242 | if (ptr == NULL) | |
243 | return ERR_PTR(-ENOMEM); | |
244 | return ptr; | |
d1bacf9e BS |
245 | } |
246 | ||
247 | static | |
248 | void nfs_readdir_release_array(struct page *page) | |
249 | { | |
250 | kunmap(page); | |
251 | } | |
252 | ||
253 | /* | |
254 | * we are freeing strings created by nfs_add_to_readdir_array() | |
255 | */ | |
256 | static | |
11de3b11 | 257 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 258 | { |
11de3b11 | 259 | struct nfs_cache_array *array; |
d1bacf9e | 260 | int i; |
8cd51a0c | 261 | |
11de3b11 | 262 | array = kmap_atomic(page, KM_USER0); |
d1bacf9e BS |
263 | for (i = 0; i < array->size; i++) |
264 | kfree(array->array[i].string.name); | |
11de3b11 | 265 | kunmap_atomic(array, KM_USER0); |
d1bacf9e BS |
266 | } |
267 | ||
268 | /* | |
269 | * the caller is responsible for freeing qstr.name | |
270 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
271 | * nfs_clear_readdir_array() | |
272 | */ | |
273 | static | |
4a201d6e | 274 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
275 | { |
276 | string->len = len; | |
277 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
278 | if (string->name == NULL) |
279 | return -ENOMEM; | |
04e4bd1c CM |
280 | /* |
281 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
282 | * in a page cache page which kmemleak does not scan. | |
283 | */ | |
284 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
285 | string->hash = full_name_hash(name, len); |
286 | return 0; | |
d1bacf9e BS |
287 | } |
288 | ||
289 | static | |
290 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
291 | { | |
292 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
293 | struct nfs_cache_array_entry *cache_entry; |
294 | int ret; | |
295 | ||
d1bacf9e BS |
296 | if (IS_ERR(array)) |
297 | return PTR_ERR(array); | |
3020093f TM |
298 | |
299 | cache_entry = &array->array[array->size]; | |
300 | ||
301 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 302 | ret = -ENOSPC; |
3020093f | 303 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 304 | goto out; |
d1bacf9e | 305 | |
4a201d6e TM |
306 | cache_entry->cookie = entry->prev_cookie; |
307 | cache_entry->ino = entry->ino; | |
0b26a0bf | 308 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
309 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
310 | if (ret) | |
311 | goto out; | |
d1bacf9e | 312 | array->last_cookie = entry->cookie; |
8cd51a0c | 313 | array->size++; |
47c716cb | 314 | if (entry->eof != 0) |
d1bacf9e | 315 | array->eof_index = array->size; |
4a201d6e | 316 | out: |
d1bacf9e | 317 | nfs_readdir_release_array(page); |
4a201d6e | 318 | return ret; |
d1bacf9e BS |
319 | } |
320 | ||
321 | static | |
322 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
323 | { | |
324 | loff_t diff = desc->file->f_pos - desc->current_index; | |
325 | unsigned int index; | |
8ef2ce3e | 326 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
d1bacf9e BS |
327 | |
328 | if (diff < 0) | |
329 | goto out_eof; | |
330 | if (diff >= array->size) { | |
8cd51a0c | 331 | if (array->eof_index >= 0) |
d1bacf9e | 332 | goto out_eof; |
d1bacf9e BS |
333 | return -EAGAIN; |
334 | } | |
335 | ||
336 | index = (unsigned int)diff; | |
337 | *desc->dir_cookie = array->array[index].cookie; | |
338 | desc->cache_entry_index = index; | |
8ef2ce3e | 339 | ctx->duped = 0; |
d1bacf9e BS |
340 | return 0; |
341 | out_eof: | |
342 | desc->eof = 1; | |
343 | return -EBADCOOKIE; | |
344 | } | |
345 | ||
346 | static | |
347 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
348 | { | |
349 | int i; | |
8ef2ce3e | 350 | loff_t new_pos; |
d1bacf9e | 351 | int status = -EAGAIN; |
8ef2ce3e | 352 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
d1bacf9e BS |
353 | |
354 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 355 | if (array->array[i].cookie == *desc->dir_cookie) { |
8ef2ce3e BS |
356 | new_pos = desc->current_index + i; |
357 | if (new_pos < desc->file->f_pos) { | |
358 | ctx->dup_cookie = *desc->dir_cookie; | |
359 | ctx->duped = 1; | |
360 | } | |
361 | desc->file->f_pos = new_pos; | |
d1bacf9e | 362 | desc->cache_entry_index = i; |
47c716cb | 363 | return 0; |
d1bacf9e BS |
364 | } |
365 | } | |
47c716cb | 366 | if (array->eof_index >= 0) { |
8cd51a0c | 367 | status = -EBADCOOKIE; |
18fb5fe4 TM |
368 | if (*desc->dir_cookie == array->last_cookie) |
369 | desc->eof = 1; | |
8cd51a0c | 370 | } |
d1bacf9e BS |
371 | return status; |
372 | } | |
373 | ||
374 | static | |
375 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
376 | { | |
377 | struct nfs_cache_array *array; | |
47c716cb | 378 | int status; |
d1bacf9e BS |
379 | |
380 | array = nfs_readdir_get_array(desc->page); | |
381 | if (IS_ERR(array)) { | |
382 | status = PTR_ERR(array); | |
383 | goto out; | |
384 | } | |
385 | ||
386 | if (*desc->dir_cookie == 0) | |
387 | status = nfs_readdir_search_for_pos(array, desc); | |
388 | else | |
389 | status = nfs_readdir_search_for_cookie(array, desc); | |
390 | ||
47c716cb | 391 | if (status == -EAGAIN) { |
0aded708 | 392 | desc->last_cookie = array->last_cookie; |
e47c085a | 393 | desc->current_index += array->size; |
47c716cb TM |
394 | desc->page_index++; |
395 | } | |
d1bacf9e BS |
396 | nfs_readdir_release_array(desc->page); |
397 | out: | |
398 | return status; | |
399 | } | |
400 | ||
401 | /* Fill a page with xdr information before transferring to the cache page */ | |
402 | static | |
56e4ebf8 | 403 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 404 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 405 | { |
480c2006 BS |
406 | struct nfs_open_dir_context *ctx = file->private_data; |
407 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 408 | unsigned long timestamp, gencount; |
1da177e4 LT |
409 | int error; |
410 | ||
1da177e4 LT |
411 | again: |
412 | timestamp = jiffies; | |
4704f0e2 | 413 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 414 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
415 | NFS_SERVER(inode)->dtsize, desc->plus); |
416 | if (error < 0) { | |
417 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
418 | if (error == -ENOTSUPP && desc->plus) { | |
419 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 420 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
421 | desc->plus = 0; |
422 | goto again; | |
423 | } | |
424 | goto error; | |
425 | } | |
1f4eab7e | 426 | desc->timestamp = timestamp; |
4704f0e2 | 427 | desc->gencount = gencount; |
d1bacf9e BS |
428 | error: |
429 | return error; | |
1da177e4 LT |
430 | } |
431 | ||
573c4e1e CL |
432 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
433 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 434 | { |
573c4e1e | 435 | int error; |
1da177e4 | 436 | |
573c4e1e CL |
437 | error = desc->decode(xdr, entry, desc->plus); |
438 | if (error) | |
439 | return error; | |
d1bacf9e BS |
440 | entry->fattr->time_start = desc->timestamp; |
441 | entry->fattr->gencount = desc->gencount; | |
442 | return 0; | |
1da177e4 LT |
443 | } |
444 | ||
d39ab9de BS |
445 | static |
446 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
447 | { | |
d39ab9de BS |
448 | if (dentry->d_inode == NULL) |
449 | goto different; | |
37a09f07 | 450 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
451 | goto different; |
452 | return 1; | |
453 | different: | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static | |
458 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
459 | { | |
4a201d6e TM |
460 | struct qstr filename = { |
461 | .len = entry->len, | |
462 | .name = entry->name, | |
463 | }; | |
464 | struct dentry *dentry; | |
465 | struct dentry *alias; | |
d39ab9de BS |
466 | struct inode *dir = parent->d_inode; |
467 | struct inode *inode; | |
468 | ||
4a201d6e TM |
469 | if (filename.name[0] == '.') { |
470 | if (filename.len == 1) | |
471 | return; | |
472 | if (filename.len == 2 && filename.name[1] == '.') | |
473 | return; | |
474 | } | |
475 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 476 | |
4a201d6e | 477 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
478 | if (dentry != NULL) { |
479 | if (nfs_same_file(dentry, entry)) { | |
480 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
481 | goto out; | |
482 | } else { | |
483 | d_drop(dentry); | |
484 | dput(dentry); | |
485 | } | |
486 | } | |
487 | ||
488 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
489 | if (dentry == NULL) |
490 | return; | |
491 | ||
d39ab9de BS |
492 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
493 | if (IS_ERR(inode)) | |
494 | goto out; | |
495 | ||
496 | alias = d_materialise_unique(dentry, inode); | |
497 | if (IS_ERR(alias)) | |
498 | goto out; | |
499 | else if (alias) { | |
500 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
501 | dput(alias); | |
502 | } else | |
503 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
504 | ||
505 | out: | |
506 | dput(dentry); | |
d39ab9de BS |
507 | } |
508 | ||
d1bacf9e BS |
509 | /* Perform conversion from xdr to cache array */ |
510 | static | |
8cd51a0c | 511 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 512 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 513 | { |
babddc72 | 514 | struct xdr_stream stream; |
6650239a TM |
515 | struct xdr_buf buf = { |
516 | .pages = xdr_pages, | |
517 | .page_len = buflen, | |
518 | .buflen = buflen, | |
519 | .len = buflen, | |
520 | }; | |
521 | struct page *scratch; | |
99424380 | 522 | struct nfs_cache_array *array; |
5c346854 TM |
523 | unsigned int count = 0; |
524 | int status; | |
babddc72 | 525 | |
6650239a TM |
526 | scratch = alloc_page(GFP_KERNEL); |
527 | if (scratch == NULL) | |
528 | return -ENOMEM; | |
babddc72 | 529 | |
6650239a TM |
530 | xdr_init_decode(&stream, &buf, NULL); |
531 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); | |
99424380 BS |
532 | |
533 | do { | |
534 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
535 | if (status != 0) { |
536 | if (status == -EAGAIN) | |
537 | status = 0; | |
99424380 | 538 | break; |
8cd51a0c | 539 | } |
99424380 | 540 | |
5c346854 TM |
541 | count++; |
542 | ||
47c716cb | 543 | if (desc->plus != 0) |
d39ab9de | 544 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
545 | |
546 | status = nfs_readdir_add_to_array(entry, page); | |
547 | if (status != 0) | |
548 | break; | |
99424380 BS |
549 | } while (!entry->eof); |
550 | ||
47c716cb | 551 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 552 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
553 | if (!IS_ERR(array)) { |
554 | array->eof_index = array->size; | |
555 | status = 0; | |
556 | nfs_readdir_release_array(page); | |
5c346854 TM |
557 | } else |
558 | status = PTR_ERR(array); | |
1da177e4 | 559 | } |
6650239a TM |
560 | |
561 | put_page(scratch); | |
8cd51a0c | 562 | return status; |
56e4ebf8 BS |
563 | } |
564 | ||
565 | static | |
566 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
567 | { | |
568 | unsigned int i; | |
569 | for (i = 0; i < npages; i++) | |
570 | put_page(pages[i]); | |
571 | } | |
572 | ||
573 | static | |
574 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
575 | unsigned int npages) | |
576 | { | |
56e4ebf8 BS |
577 | nfs_readdir_free_pagearray(pages, npages); |
578 | } | |
579 | ||
580 | /* | |
581 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
582 | * to nfs_readdir_free_large_page | |
583 | */ | |
584 | static | |
6650239a | 585 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 586 | { |
56e4ebf8 BS |
587 | unsigned int i; |
588 | ||
589 | for (i = 0; i < npages; i++) { | |
590 | struct page *page = alloc_page(GFP_KERNEL); | |
591 | if (page == NULL) | |
592 | goto out_freepages; | |
593 | pages[i] = page; | |
594 | } | |
6650239a | 595 | return 0; |
56e4ebf8 | 596 | |
56e4ebf8 BS |
597 | out_freepages: |
598 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 599 | return -ENOMEM; |
1da177e4 LT |
600 | } |
601 | ||
d1bacf9e BS |
602 | static |
603 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 604 | { |
56e4ebf8 BS |
605 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
606 | void *pages_ptr = NULL; | |
d1bacf9e BS |
607 | struct nfs_entry entry; |
608 | struct file *file = desc->file; | |
609 | struct nfs_cache_array *array; | |
8cd51a0c | 610 | int status = -ENOMEM; |
56e4ebf8 | 611 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
612 | |
613 | entry.prev_cookie = 0; | |
0aded708 | 614 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
615 | entry.eof = 0; |
616 | entry.fh = nfs_alloc_fhandle(); | |
617 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 618 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
619 | if (entry.fh == NULL || entry.fattr == NULL) |
620 | goto out; | |
00a92642 | 621 | |
d1bacf9e | 622 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
623 | if (IS_ERR(array)) { |
624 | status = PTR_ERR(array); | |
625 | goto out; | |
626 | } | |
d1bacf9e BS |
627 | memset(array, 0, sizeof(struct nfs_cache_array)); |
628 | array->eof_index = -1; | |
00a92642 | 629 | |
6650239a TM |
630 | status = nfs_readdir_large_page(pages, array_size); |
631 | if (status < 0) | |
d1bacf9e BS |
632 | goto out_release_array; |
633 | do { | |
ac396128 | 634 | unsigned int pglen; |
56e4ebf8 | 635 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 636 | |
d1bacf9e | 637 | if (status < 0) |
00a92642 | 638 | break; |
ac396128 | 639 | pglen = status; |
6650239a | 640 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
641 | if (status < 0) { |
642 | if (status == -ENOSPC) | |
643 | status = 0; | |
644 | break; | |
645 | } | |
646 | } while (array->eof_index < 0); | |
d1bacf9e | 647 | |
56e4ebf8 | 648 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
649 | out_release_array: |
650 | nfs_readdir_release_array(page); | |
651 | out: | |
652 | nfs_free_fattr(entry.fattr); | |
653 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
654 | return status; |
655 | } | |
656 | ||
657 | /* | |
d1bacf9e BS |
658 | * Now we cache directories properly, by converting xdr information |
659 | * to an array that can be used for lookups later. This results in | |
660 | * fewer cache pages, since we can store more information on each page. | |
661 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 662 | */ |
d1bacf9e BS |
663 | static |
664 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 665 | { |
01cce933 | 666 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 667 | int ret; |
1da177e4 | 668 | |
8cd51a0c TM |
669 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
670 | if (ret < 0) | |
d1bacf9e BS |
671 | goto error; |
672 | SetPageUptodate(page); | |
1da177e4 | 673 | |
d1bacf9e BS |
674 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
675 | /* Should never happen */ | |
676 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 677 | } |
d1bacf9e BS |
678 | unlock_page(page); |
679 | return 0; | |
680 | error: | |
681 | unlock_page(page); | |
8cd51a0c | 682 | return ret; |
d1bacf9e | 683 | } |
1da177e4 | 684 | |
d1bacf9e BS |
685 | static |
686 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
687 | { | |
11de3b11 TM |
688 | if (!desc->page->mapping) |
689 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
690 | page_cache_release(desc->page); |
691 | desc->page = NULL; | |
692 | } | |
693 | ||
694 | static | |
695 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
696 | { | |
8cd51a0c | 697 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 698 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
699 | } |
700 | ||
701 | /* | |
d1bacf9e | 702 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 703 | */ |
d1bacf9e BS |
704 | static |
705 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
706 | { | |
707 | int res; | |
708 | ||
709 | desc->page = get_cache_page(desc); | |
710 | if (IS_ERR(desc->page)) | |
711 | return PTR_ERR(desc->page); | |
712 | ||
713 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
714 | if (res != 0) |
715 | cache_page_release(desc); | |
d1bacf9e BS |
716 | return res; |
717 | } | |
718 | ||
719 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
720 | static inline |
721 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
722 | { | |
8cd51a0c | 723 | int res; |
d1bacf9e | 724 | |
0aded708 | 725 | if (desc->page_index == 0) { |
8cd51a0c | 726 | desc->current_index = 0; |
0aded708 TM |
727 | desc->last_cookie = 0; |
728 | } | |
47c716cb | 729 | do { |
d1bacf9e | 730 | res = find_cache_page(desc); |
47c716cb | 731 | } while (res == -EAGAIN); |
1da177e4 LT |
732 | return res; |
733 | } | |
734 | ||
1da177e4 LT |
735 | /* |
736 | * Once we've found the start of the dirent within a page: fill 'er up... | |
737 | */ | |
738 | static | |
739 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
740 | filldir_t filldir) | |
741 | { | |
742 | struct file *file = desc->file; | |
d1bacf9e BS |
743 | int i = 0; |
744 | int res = 0; | |
745 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
746 | struct nfs_open_dir_context *ctx = file->private_data; |
747 | ||
748 | if (ctx->duped != 0 && ctx->dup_cookie == *desc->dir_cookie) { | |
749 | if (printk_ratelimit()) { | |
750 | pr_notice("NFS: directory %s/%s contains a readdir loop. " | |
751 | "Please contact your server vendor. " | |
752 | "Offending cookie: %llu\n", | |
753 | file->f_dentry->d_parent->d_name.name, | |
754 | file->f_dentry->d_name.name, | |
755 | *desc->dir_cookie); | |
756 | } | |
757 | res = -ELOOP; | |
758 | goto out; | |
759 | } | |
d1bacf9e BS |
760 | |
761 | array = nfs_readdir_get_array(desc->page); | |
e7c58e97 TM |
762 | if (IS_ERR(array)) { |
763 | res = PTR_ERR(array); | |
764 | goto out; | |
765 | } | |
d1bacf9e BS |
766 | |
767 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 768 | struct nfs_cache_array_entry *ent; |
1da177e4 | 769 | |
ece0b423 TM |
770 | ent = &array->array[i]; |
771 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
772 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
773 | ent->d_type) < 0) { | |
ece0b423 | 774 | desc->eof = 1; |
1da177e4 | 775 | break; |
ece0b423 | 776 | } |
00a92642 | 777 | file->f_pos++; |
d1bacf9e BS |
778 | if (i < (array->size-1)) |
779 | *desc->dir_cookie = array->array[i+1].cookie; | |
780 | else | |
781 | *desc->dir_cookie = array->last_cookie; | |
1da177e4 | 782 | } |
47c716cb | 783 | if (array->eof_index >= 0) |
8cd51a0c | 784 | desc->eof = 1; |
d1bacf9e BS |
785 | |
786 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 787 | out: |
d1bacf9e | 788 | cache_page_release(desc); |
1e7cb3dc CL |
789 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
790 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
791 | return res; |
792 | } | |
793 | ||
794 | /* | |
795 | * If we cannot find a cookie in our cache, we suspect that this is | |
796 | * because it points to a deleted file, so we ask the server to return | |
797 | * whatever it thinks is the next entry. We then feed this to filldir. | |
798 | * If all goes well, we should then be able to find our way round the | |
799 | * cache on the next call to readdir_search_pagecache(); | |
800 | * | |
801 | * NOTE: we cannot add the anonymous page to the pagecache because | |
802 | * the data it contains might not be page aligned. Besides, | |
803 | * we should already have a complete representation of the | |
804 | * directory in the page cache by the time we get here. | |
805 | */ | |
806 | static inline | |
807 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
808 | filldir_t filldir) | |
809 | { | |
1da177e4 LT |
810 | struct page *page = NULL; |
811 | int status; | |
d1bacf9e | 812 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
1da177e4 | 813 | |
1e7cb3dc CL |
814 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
815 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
816 | |
817 | page = alloc_page(GFP_HIGHUSER); | |
818 | if (!page) { | |
819 | status = -ENOMEM; | |
820 | goto out; | |
821 | } | |
d1bacf9e | 822 | |
7a8e1dc3 | 823 | desc->page_index = 0; |
0aded708 | 824 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 TM |
825 | desc->page = page; |
826 | ||
85f8607e TM |
827 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
828 | if (status < 0) | |
1da177e4 LT |
829 | goto out_release; |
830 | ||
831 | status = nfs_do_filldir(desc, dirent, filldir); | |
832 | ||
1da177e4 | 833 | out: |
1e7cb3dc | 834 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 835 | __func__, status); |
1da177e4 LT |
836 | return status; |
837 | out_release: | |
d1bacf9e | 838 | cache_page_release(desc); |
1da177e4 LT |
839 | goto out; |
840 | } | |
841 | ||
00a92642 OG |
842 | /* The file offset position represents the dirent entry number. A |
843 | last cookie cache takes care of the common case of reading the | |
844 | whole directory. | |
1da177e4 LT |
845 | */ |
846 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
847 | { | |
01cce933 | 848 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
849 | struct inode *inode = dentry->d_inode; |
850 | nfs_readdir_descriptor_t my_desc, | |
851 | *desc = &my_desc; | |
480c2006 | 852 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 853 | int res; |
1da177e4 | 854 | |
6da24bc9 | 855 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
856 | dentry->d_parent->d_name.name, dentry->d_name.name, |
857 | (long long)filp->f_pos); | |
91d5b470 CL |
858 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
859 | ||
1da177e4 | 860 | /* |
00a92642 | 861 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 862 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
863 | * to either find the entry with the appropriate number or |
864 | * revalidate the cookie. | |
1da177e4 LT |
865 | */ |
866 | memset(desc, 0, sizeof(*desc)); | |
867 | ||
868 | desc->file = filp; | |
480c2006 | 869 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 LT |
870 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
871 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
872 | ||
565277f6 | 873 | nfs_block_sillyrename(dentry); |
1cda707d | 874 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
875 | if (res < 0) |
876 | goto out; | |
877 | ||
47c716cb | 878 | do { |
1da177e4 | 879 | res = readdir_search_pagecache(desc); |
00a92642 | 880 | |
1da177e4 | 881 | if (res == -EBADCOOKIE) { |
ece0b423 | 882 | res = 0; |
1da177e4 | 883 | /* This means either end of directory */ |
d1bacf9e | 884 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
885 | /* Or that the server has 'lost' a cookie */ |
886 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 887 | if (res == 0) |
1da177e4 LT |
888 | continue; |
889 | } | |
1da177e4 LT |
890 | break; |
891 | } | |
892 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 893 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 894 | nfs_zap_caches(inode); |
baf57a09 | 895 | desc->page_index = 0; |
1da177e4 | 896 | desc->plus = 0; |
d1bacf9e | 897 | desc->eof = 0; |
1da177e4 LT |
898 | continue; |
899 | } | |
900 | if (res < 0) | |
901 | break; | |
902 | ||
903 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 904 | if (res < 0) |
1da177e4 | 905 | break; |
47c716cb | 906 | } while (!desc->eof); |
fccca7fc | 907 | out: |
565277f6 | 908 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
909 | if (res > 0) |
910 | res = 0; | |
aa49b4cf | 911 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
912 | dentry->d_parent->d_name.name, dentry->d_name.name, |
913 | res); | |
914 | return res; | |
1da177e4 LT |
915 | } |
916 | ||
10afec90 | 917 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 918 | { |
b84e06c5 CL |
919 | struct dentry *dentry = filp->f_path.dentry; |
920 | struct inode *inode = dentry->d_inode; | |
480c2006 | 921 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 922 | |
6da24bc9 | 923 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
924 | dentry->d_parent->d_name.name, |
925 | dentry->d_name.name, | |
926 | offset, origin); | |
927 | ||
928 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
929 | switch (origin) { |
930 | case 1: | |
931 | offset += filp->f_pos; | |
932 | case 0: | |
933 | if (offset >= 0) | |
934 | break; | |
935 | default: | |
936 | offset = -EINVAL; | |
937 | goto out; | |
938 | } | |
939 | if (offset != filp->f_pos) { | |
940 | filp->f_pos = offset; | |
480c2006 | 941 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 942 | dir_ctx->duped = 0; |
f0dd2136 TM |
943 | } |
944 | out: | |
b84e06c5 | 945 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
946 | return offset; |
947 | } | |
948 | ||
1da177e4 LT |
949 | /* |
950 | * All directory operations under NFS are synchronous, so fsync() | |
951 | * is a dummy operation. | |
952 | */ | |
7ea80859 | 953 | static int nfs_fsync_dir(struct file *filp, int datasync) |
1da177e4 | 954 | { |
7ea80859 CH |
955 | struct dentry *dentry = filp->f_path.dentry; |
956 | ||
6da24bc9 | 957 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
958 | dentry->d_parent->d_name.name, dentry->d_name.name, |
959 | datasync); | |
960 | ||
54917786 | 961 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
962 | return 0; |
963 | } | |
964 | ||
bfc69a45 TM |
965 | /** |
966 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
967 | * @dir - pointer to directory inode | |
968 | * | |
969 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
970 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
971 | * on the server that might have invalidated our dcache. | |
972 | * | |
973 | * The caller should be holding dir->i_lock | |
974 | */ | |
975 | void nfs_force_lookup_revalidate(struct inode *dir) | |
976 | { | |
011935a0 | 977 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
978 | } |
979 | ||
1da177e4 LT |
980 | /* |
981 | * A check for whether or not the parent directory has changed. | |
982 | * In the case it has, we assume that the dentries are untrustworthy | |
983 | * and may need to be looked up again. | |
984 | */ | |
c79ba787 | 985 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
986 | { |
987 | if (IS_ROOT(dentry)) | |
988 | return 1; | |
4eec952e TM |
989 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
990 | return 0; | |
f2c77f4e TM |
991 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
992 | return 0; | |
993 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
994 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
995 | return 0; | |
996 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
997 | return 0; | |
998 | return 1; | |
1da177e4 LT |
999 | } |
1000 | ||
1d6757fb TM |
1001 | /* |
1002 | * Return the intent data that applies to this particular path component | |
1003 | * | |
1004 | * Note that the current set of intents only apply to the very last | |
1005 | * component of the path. | |
1006 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. | |
1007 | */ | |
34286d66 NP |
1008 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, |
1009 | unsigned int mask) | |
1d6757fb TM |
1010 | { |
1011 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) | |
1012 | return 0; | |
1013 | return nd->flags & mask; | |
1014 | } | |
1015 | ||
a12802ca TM |
1016 | /* |
1017 | * Use intent information to check whether or not we're going to do | |
1018 | * an O_EXCL create using this path component. | |
1019 | */ | |
1020 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
1021 | { | |
1022 | if (NFS_PROTO(dir)->version == 2) | |
1023 | return 0; | |
3516586a | 1024 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
1025 | } |
1026 | ||
1d6757fb TM |
1027 | /* |
1028 | * Inode and filehandle revalidation for lookups. | |
1029 | * | |
1030 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1031 | * or if the intent information indicates that we're about to open this | |
1032 | * particular file and the "nocto" mount flag is not set. | |
1033 | * | |
1034 | */ | |
1da177e4 LT |
1035 | static inline |
1036 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
1037 | { | |
1038 | struct nfs_server *server = NFS_SERVER(inode); | |
1039 | ||
36d43a43 | 1040 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1041 | return 0; |
1da177e4 | 1042 | if (nd != NULL) { |
1da177e4 | 1043 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 1044 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
1045 | goto out_force; |
1046 | /* This is an open(2) */ | |
1d6757fb | 1047 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
1048 | !(server->flags & NFS_MOUNT_NOCTO) && |
1049 | (S_ISREG(inode->i_mode) || | |
1050 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 1051 | goto out_force; |
4f48af45 | 1052 | return 0; |
1da177e4 LT |
1053 | } |
1054 | return nfs_revalidate_inode(server, inode); | |
1055 | out_force: | |
1056 | return __nfs_revalidate_inode(server, inode); | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * We judge how long we want to trust negative | |
1061 | * dentries by looking at the parent inode mtime. | |
1062 | * | |
1063 | * If parent mtime has changed, we revalidate, else we wait for a | |
1064 | * period corresponding to the parent's attribute cache timeout value. | |
1065 | */ | |
1066 | static inline | |
1067 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
1068 | struct nameidata *nd) | |
1069 | { | |
1da177e4 | 1070 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 1071 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1072 | return 0; |
4eec952e TM |
1073 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1074 | return 1; | |
1da177e4 LT |
1075 | return !nfs_check_verifier(dir, dentry); |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * This is called every time the dcache has a lookup hit, | |
1080 | * and we should check whether we can really trust that | |
1081 | * lookup. | |
1082 | * | |
1083 | * NOTE! The hit can be a negative hit too, don't assume | |
1084 | * we have an inode! | |
1085 | * | |
1086 | * If the parent directory is seen to have changed, we throw out the | |
1087 | * cached dentry and do a new lookup. | |
1088 | */ | |
34286d66 | 1089 | static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1090 | { |
1091 | struct inode *dir; | |
1092 | struct inode *inode; | |
1093 | struct dentry *parent; | |
e1fb4d05 TM |
1094 | struct nfs_fh *fhandle = NULL; |
1095 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1096 | int error; |
1da177e4 | 1097 | |
34286d66 NP |
1098 | if (nd->flags & LOOKUP_RCU) |
1099 | return -ECHILD; | |
1100 | ||
1da177e4 | 1101 | parent = dget_parent(dentry); |
1da177e4 | 1102 | dir = parent->d_inode; |
91d5b470 | 1103 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1104 | inode = dentry->d_inode; |
1105 | ||
1106 | if (!inode) { | |
1107 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1108 | goto out_bad; | |
1109 | goto out_valid; | |
1110 | } | |
1111 | ||
1112 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1113 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1114 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1115 | dentry->d_name.name); |
1da177e4 LT |
1116 | goto out_bad; |
1117 | } | |
1118 | ||
15860ab1 TM |
1119 | if (nfs_have_delegation(inode, FMODE_READ)) |
1120 | goto out_set_verifier; | |
1121 | ||
1da177e4 | 1122 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1123 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1124 | if (nfs_lookup_verify_inode(inode, nd)) |
1125 | goto out_zap_parent; | |
1126 | goto out_valid; | |
1127 | } | |
1128 | ||
1129 | if (NFS_STALE(inode)) | |
1130 | goto out_bad; | |
1131 | ||
e1fb4d05 TM |
1132 | error = -ENOMEM; |
1133 | fhandle = nfs_alloc_fhandle(); | |
1134 | fattr = nfs_alloc_fattr(); | |
1135 | if (fhandle == NULL || fattr == NULL) | |
1136 | goto out_error; | |
1137 | ||
7c513058 | 1138 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1139 | if (error) |
1140 | goto out_bad; | |
e1fb4d05 | 1141 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1142 | goto out_bad; |
e1fb4d05 | 1143 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1144 | goto out_bad; |
1145 | ||
e1fb4d05 TM |
1146 | nfs_free_fattr(fattr); |
1147 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1148 | out_set_verifier: |
cf8ba45e | 1149 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1150 | out_valid: |
1da177e4 | 1151 | dput(parent); |
1e7cb3dc | 1152 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1153 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1154 | dentry->d_name.name); |
1da177e4 LT |
1155 | return 1; |
1156 | out_zap_parent: | |
1157 | nfs_zap_caches(dir); | |
1158 | out_bad: | |
a1643a92 | 1159 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1160 | if (inode && S_ISDIR(inode->i_mode)) { |
1161 | /* Purge readdir caches. */ | |
1162 | nfs_zap_caches(inode); | |
1163 | /* If we have submounts, don't unhash ! */ | |
1164 | if (have_submounts(dentry)) | |
1165 | goto out_valid; | |
d9e80b7d AV |
1166 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1167 | goto out_valid; | |
1da177e4 LT |
1168 | shrink_dcache_parent(dentry); |
1169 | } | |
1170 | d_drop(dentry); | |
e1fb4d05 TM |
1171 | nfs_free_fattr(fattr); |
1172 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1173 | dput(parent); |
1e7cb3dc | 1174 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1175 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1176 | dentry->d_name.name); |
1da177e4 | 1177 | return 0; |
e1fb4d05 TM |
1178 | out_error: |
1179 | nfs_free_fattr(fattr); | |
1180 | nfs_free_fhandle(fhandle); | |
1181 | dput(parent); | |
1182 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1183 | __func__, dentry->d_parent->d_name.name, | |
1184 | dentry->d_name.name, error); | |
1185 | return error; | |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | /* | |
1189 | * This is called from dput() when d_count is going to 0. | |
1190 | */ | |
fe15ce44 | 1191 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1192 | { |
1193 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1194 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1195 | dentry->d_flags); | |
1196 | ||
77f11192 TM |
1197 | /* Unhash any dentry with a stale inode */ |
1198 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1199 | return 1; | |
1200 | ||
1da177e4 LT |
1201 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1202 | /* Unhash it, so that ->d_iput() would be called */ | |
1203 | return 1; | |
1204 | } | |
1205 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1206 | /* Unhash it, so that ancestors of killed async unlink | |
1207 | * files will be cleaned up during umount */ | |
1208 | return 1; | |
1209 | } | |
1210 | return 0; | |
1211 | ||
1212 | } | |
1213 | ||
1b83d707 TM |
1214 | static void nfs_drop_nlink(struct inode *inode) |
1215 | { | |
1216 | spin_lock(&inode->i_lock); | |
1217 | if (inode->i_nlink > 0) | |
1218 | drop_nlink(inode); | |
1219 | spin_unlock(&inode->i_lock); | |
1220 | } | |
1221 | ||
1da177e4 LT |
1222 | /* |
1223 | * Called when the dentry loses inode. | |
1224 | * We use it to clean up silly-renamed files. | |
1225 | */ | |
1226 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1227 | { | |
83672d39 NB |
1228 | if (S_ISDIR(inode->i_mode)) |
1229 | /* drop any readdir cache as it could easily be old */ | |
1230 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1231 | ||
1da177e4 | 1232 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1233 | drop_nlink(inode); |
e4eff1a6 | 1234 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1235 | } |
1da177e4 LT |
1236 | iput(inode); |
1237 | } | |
1238 | ||
b1942c5f AV |
1239 | static void nfs_d_release(struct dentry *dentry) |
1240 | { | |
1241 | /* free cached devname value, if it survived that far */ | |
1242 | if (unlikely(dentry->d_fsdata)) { | |
1243 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1244 | WARN_ON(1); | |
1245 | else | |
1246 | kfree(dentry->d_fsdata); | |
1247 | } | |
1248 | } | |
1249 | ||
f786aa90 | 1250 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1251 | .d_revalidate = nfs_lookup_revalidate, |
1252 | .d_delete = nfs_dentry_delete, | |
1253 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1254 | .d_automount = nfs_d_automount, |
b1942c5f | 1255 | .d_release = nfs_d_release, |
1da177e4 LT |
1256 | }; |
1257 | ||
1da177e4 LT |
1258 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1259 | { | |
1260 | struct dentry *res; | |
565277f6 | 1261 | struct dentry *parent; |
1da177e4 | 1262 | struct inode *inode = NULL; |
e1fb4d05 TM |
1263 | struct nfs_fh *fhandle = NULL; |
1264 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1265 | int error; |
1da177e4 LT |
1266 | |
1267 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1268 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1269 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1270 | |
1271 | res = ERR_PTR(-ENAMETOOLONG); | |
1272 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1273 | goto out; | |
1274 | ||
fd684071 TM |
1275 | /* |
1276 | * If we're doing an exclusive create, optimize away the lookup | |
1277 | * but don't hash the dentry. | |
1278 | */ | |
1279 | if (nfs_is_exclusive_create(dir, nd)) { | |
1280 | d_instantiate(dentry, NULL); | |
1281 | res = NULL; | |
fc0f684c | 1282 | goto out; |
fd684071 | 1283 | } |
1da177e4 | 1284 | |
e1fb4d05 TM |
1285 | res = ERR_PTR(-ENOMEM); |
1286 | fhandle = nfs_alloc_fhandle(); | |
1287 | fattr = nfs_alloc_fattr(); | |
1288 | if (fhandle == NULL || fattr == NULL) | |
1289 | goto out; | |
1290 | ||
565277f6 TM |
1291 | parent = dentry->d_parent; |
1292 | /* Protect against concurrent sillydeletes */ | |
1293 | nfs_block_sillyrename(parent); | |
7c513058 | 1294 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1295 | if (error == -ENOENT) |
1296 | goto no_entry; | |
1297 | if (error < 0) { | |
1298 | res = ERR_PTR(error); | |
565277f6 | 1299 | goto out_unblock_sillyrename; |
1da177e4 | 1300 | } |
e1fb4d05 | 1301 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1302 | res = ERR_CAST(inode); |
03f28e3a | 1303 | if (IS_ERR(res)) |
565277f6 | 1304 | goto out_unblock_sillyrename; |
54ceac45 | 1305 | |
1da177e4 | 1306 | no_entry: |
54ceac45 | 1307 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1308 | if (res != NULL) { |
1309 | if (IS_ERR(res)) | |
565277f6 | 1310 | goto out_unblock_sillyrename; |
1da177e4 | 1311 | dentry = res; |
9eaef27b | 1312 | } |
1da177e4 | 1313 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1314 | out_unblock_sillyrename: |
1315 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1316 | out: |
e1fb4d05 TM |
1317 | nfs_free_fattr(fattr); |
1318 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1319 | return res; |
1320 | } | |
1321 | ||
1322 | #ifdef CONFIG_NFS_V4 | |
1323 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1324 | ||
f786aa90 | 1325 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1326 | .d_revalidate = nfs_open_revalidate, |
1327 | .d_delete = nfs_dentry_delete, | |
1328 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1329 | .d_automount = nfs_d_automount, |
b1942c5f | 1330 | .d_release = nfs_d_release, |
1da177e4 LT |
1331 | }; |
1332 | ||
1d6757fb TM |
1333 | /* |
1334 | * Use intent information to determine whether we need to substitute | |
1335 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1336 | */ | |
5584c306 | 1337 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1338 | { |
1d6757fb | 1339 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1340 | return 0; |
1341 | /* NFS does not (yet) have a stateful open for directories */ | |
1342 | if (nd->flags & LOOKUP_DIRECTORY) | |
1343 | return 0; | |
1344 | /* Are we trying to write to a read only partition? */ | |
2c463e95 DH |
1345 | if (__mnt_is_readonly(nd->path.mnt) && |
1346 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) | |
1da177e4 LT |
1347 | return 0; |
1348 | return 1; | |
1349 | } | |
1350 | ||
cd9a1c0e TM |
1351 | static struct nfs_open_context *nameidata_to_nfs_open_context(struct dentry *dentry, struct nameidata *nd) |
1352 | { | |
1353 | struct path path = { | |
1354 | .mnt = nd->path.mnt, | |
1355 | .dentry = dentry, | |
1356 | }; | |
1357 | struct nfs_open_context *ctx; | |
1358 | struct rpc_cred *cred; | |
1359 | fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC); | |
1360 | ||
1361 | cred = rpc_lookup_cred(); | |
1362 | if (IS_ERR(cred)) | |
1363 | return ERR_CAST(cred); | |
1364 | ctx = alloc_nfs_open_context(&path, cred, fmode); | |
1365 | put_rpccred(cred); | |
1366 | if (ctx == NULL) | |
1367 | return ERR_PTR(-ENOMEM); | |
1368 | return ctx; | |
1369 | } | |
1370 | ||
1371 | static int do_open(struct inode *inode, struct file *filp) | |
1372 | { | |
1373 | nfs_fscache_set_inode_cookie(inode, filp); | |
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1378 | { | |
1379 | struct file *filp; | |
1380 | int ret = 0; | |
1381 | ||
1382 | /* If the open_intent is for execute, we have an extra check to make */ | |
1383 | if (ctx->mode & FMODE_EXEC) { | |
1384 | ret = nfs_may_open(ctx->path.dentry->d_inode, | |
1385 | ctx->cred, | |
1386 | nd->intent.open.flags); | |
1387 | if (ret < 0) | |
1388 | goto out; | |
1389 | } | |
1390 | filp = lookup_instantiate_filp(nd, ctx->path.dentry, do_open); | |
1391 | if (IS_ERR(filp)) | |
1392 | ret = PTR_ERR(filp); | |
1393 | else | |
1394 | nfs_file_set_open_context(filp, ctx); | |
1395 | out: | |
1396 | put_nfs_open_context(ctx); | |
1397 | return ret; | |
1398 | } | |
1399 | ||
1da177e4 LT |
1400 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1401 | { | |
cd9a1c0e TM |
1402 | struct nfs_open_context *ctx; |
1403 | struct iattr attr; | |
1da177e4 | 1404 | struct dentry *res = NULL; |
f46e0bd3 | 1405 | struct inode *inode; |
cd9a1c0e | 1406 | int open_flags; |
898f635c | 1407 | int err; |
1da177e4 | 1408 | |
1e7cb3dc CL |
1409 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1410 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1411 | ||
1da177e4 | 1412 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1413 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1414 | goto no_open; |
1415 | ||
1416 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1417 | res = ERR_PTR(-ENAMETOOLONG); | |
1418 | goto out; | |
1419 | } | |
1da177e4 | 1420 | |
d4d9cdcb TM |
1421 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1422 | * the dentry. */ | |
3516586a | 1423 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1424 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1425 | goto out; |
1426 | } | |
1da177e4 | 1427 | |
cd9a1c0e TM |
1428 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1429 | res = ERR_CAST(ctx); | |
1430 | if (IS_ERR(ctx)) | |
1431 | goto out; | |
1432 | ||
1433 | open_flags = nd->intent.open.flags; | |
1434 | if (nd->flags & LOOKUP_CREATE) { | |
1435 | attr.ia_mode = nd->intent.open.create_mode; | |
1436 | attr.ia_valid = ATTR_MODE; | |
a8a5da99 | 1437 | attr.ia_mode &= ~current_umask(); |
cd9a1c0e | 1438 | } else { |
898f635c | 1439 | open_flags &= ~(O_EXCL | O_CREAT); |
cd9a1c0e | 1440 | attr.ia_valid = 0; |
cd9a1c0e TM |
1441 | } |
1442 | ||
1da177e4 | 1443 | /* Open the file on the server */ |
f46e0bd3 | 1444 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1445 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1446 | if (IS_ERR(inode)) { |
1447 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1448 | put_nfs_open_context(ctx); |
f46e0bd3 | 1449 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1450 | /* Make a negative dentry */ |
1451 | case -ENOENT: | |
f46e0bd3 | 1452 | d_add(dentry, NULL); |
02a913a7 TM |
1453 | res = NULL; |
1454 | goto out; | |
1da177e4 | 1455 | /* This turned out not to be a regular file */ |
6f926b5b TM |
1456 | case -ENOTDIR: |
1457 | goto no_open; | |
1da177e4 LT |
1458 | case -ELOOP: |
1459 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1460 | goto no_open; | |
23ebbd9a | 1461 | /* case -EISDIR: */ |
1da177e4 LT |
1462 | /* case -EINVAL: */ |
1463 | default: | |
f46e0bd3 | 1464 | res = ERR_CAST(inode); |
1da177e4 LT |
1465 | goto out; |
1466 | } | |
cd9a1c0e | 1467 | } |
f46e0bd3 | 1468 | res = d_add_unique(dentry, inode); |
898f635c | 1469 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 TM |
1470 | if (res != NULL) { |
1471 | dput(ctx->path.dentry); | |
1472 | ctx->path.dentry = dget(res); | |
1da177e4 | 1473 | dentry = res; |
f46e0bd3 | 1474 | } |
898f635c TM |
1475 | err = nfs_intent_set_file(nd, ctx); |
1476 | if (err < 0) { | |
1477 | if (res != NULL) | |
1478 | dput(res); | |
1479 | return ERR_PTR(err); | |
1480 | } | |
1da177e4 | 1481 | out: |
f46e0bd3 | 1482 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1483 | return res; |
1484 | no_open: | |
1485 | return nfs_lookup(dir, dentry, nd); | |
1486 | } | |
1487 | ||
1488 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1489 | { | |
1490 | struct dentry *parent = NULL; | |
657e94b6 | 1491 | struct inode *inode; |
1da177e4 | 1492 | struct inode *dir; |
b8d4cadd | 1493 | struct nfs_open_context *ctx; |
1da177e4 LT |
1494 | int openflags, ret = 0; |
1495 | ||
657e94b6 NP |
1496 | if (nd->flags & LOOKUP_RCU) |
1497 | return -ECHILD; | |
1498 | ||
1499 | inode = dentry->d_inode; | |
1f063d2c | 1500 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1501 | goto no_open; |
2b484297 | 1502 | |
1da177e4 LT |
1503 | parent = dget_parent(dentry); |
1504 | dir = parent->d_inode; | |
2b484297 | 1505 | |
1da177e4 LT |
1506 | /* We can't create new files in nfs_open_revalidate(), so we |
1507 | * optimize away revalidation of negative dentries. | |
1508 | */ | |
216d5d06 TM |
1509 | if (inode == NULL) { |
1510 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1511 | ret = 1; | |
1da177e4 | 1512 | goto out; |
216d5d06 TM |
1513 | } |
1514 | ||
1da177e4 LT |
1515 | /* NFS only supports OPEN on regular files */ |
1516 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1517 | goto no_open_dput; |
1da177e4 LT |
1518 | openflags = nd->intent.open.flags; |
1519 | /* We cannot do exclusive creation on a positive dentry */ | |
1520 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1521 | goto no_open_dput; |
1da177e4 | 1522 | /* We can't create new files, or truncate existing ones here */ |
0a377cff | 1523 | openflags &= ~(O_CREAT|O_EXCL|O_TRUNC); |
1da177e4 | 1524 | |
b8d4cadd TM |
1525 | ctx = nameidata_to_nfs_open_context(dentry, nd); |
1526 | ret = PTR_ERR(ctx); | |
1527 | if (IS_ERR(ctx)) | |
1528 | goto out; | |
1da177e4 | 1529 | /* |
1b1dcc1b | 1530 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1531 | * operations that change the directory. We therefore save the |
1532 | * change attribute *before* we do the RPC call. | |
1533 | */ | |
2b484297 | 1534 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, NULL); |
535918f1 TM |
1535 | if (IS_ERR(inode)) { |
1536 | ret = PTR_ERR(inode); | |
1537 | switch (ret) { | |
1538 | case -EPERM: | |
1539 | case -EACCES: | |
1540 | case -EDQUOT: | |
1541 | case -ENOSPC: | |
1542 | case -EROFS: | |
1543 | goto out_put_ctx; | |
1544 | default: | |
1545 | goto out_drop; | |
1546 | } | |
1547 | } | |
1548 | iput(inode); | |
898f635c | 1549 | if (inode != dentry->d_inode) |
535918f1 | 1550 | goto out_drop; |
898f635c TM |
1551 | |
1552 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1553 | ret = nfs_intent_set_file(nd, ctx); | |
1554 | if (ret >= 0) | |
1555 | ret = 1; | |
1da177e4 LT |
1556 | out: |
1557 | dput(parent); | |
1da177e4 | 1558 | return ret; |
535918f1 TM |
1559 | out_drop: |
1560 | d_drop(dentry); | |
1561 | ret = 0; | |
1562 | out_put_ctx: | |
1563 | put_nfs_open_context(ctx); | |
1564 | goto out; | |
1565 | ||
5584c306 | 1566 | no_open_dput: |
1da177e4 | 1567 | dput(parent); |
5584c306 | 1568 | no_open: |
1da177e4 LT |
1569 | return nfs_lookup_revalidate(dentry, nd); |
1570 | } | |
c0204fd2 TM |
1571 | |
1572 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, int mode, | |
1573 | struct nameidata *nd) | |
1574 | { | |
1575 | struct nfs_open_context *ctx = NULL; | |
1576 | struct iattr attr; | |
1577 | int error; | |
1578 | int open_flags = 0; | |
1579 | ||
1580 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1581 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1582 | ||
1583 | attr.ia_mode = mode; | |
1584 | attr.ia_valid = ATTR_MODE; | |
1585 | ||
1586 | if ((nd->flags & LOOKUP_CREATE) != 0) { | |
1587 | open_flags = nd->intent.open.flags; | |
1588 | ||
1589 | ctx = nameidata_to_nfs_open_context(dentry, nd); | |
1590 | error = PTR_ERR(ctx); | |
1591 | if (IS_ERR(ctx)) | |
898f635c | 1592 | goto out_err_drop; |
c0204fd2 TM |
1593 | } |
1594 | ||
1595 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1596 | if (error != 0) | |
1597 | goto out_put_ctx; | |
898f635c TM |
1598 | if (ctx != NULL) { |
1599 | error = nfs_intent_set_file(nd, ctx); | |
1600 | if (error < 0) | |
1601 | goto out_err; | |
1602 | } | |
c0204fd2 TM |
1603 | return 0; |
1604 | out_put_ctx: | |
1605 | if (ctx != NULL) | |
1606 | put_nfs_open_context(ctx); | |
898f635c | 1607 | out_err_drop: |
c0204fd2 | 1608 | d_drop(dentry); |
898f635c | 1609 | out_err: |
c0204fd2 TM |
1610 | return error; |
1611 | } | |
1612 | ||
1da177e4 LT |
1613 | #endif /* CONFIG_NFSV4 */ |
1614 | ||
1da177e4 LT |
1615 | /* |
1616 | * Code common to create, mkdir, and mknod. | |
1617 | */ | |
1618 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1619 | struct nfs_fattr *fattr) | |
1620 | { | |
fab728e1 TM |
1621 | struct dentry *parent = dget_parent(dentry); |
1622 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1623 | struct inode *inode; |
1624 | int error = -EACCES; | |
1625 | ||
fab728e1 TM |
1626 | d_drop(dentry); |
1627 | ||
1da177e4 LT |
1628 | /* We may have been initialized further down */ |
1629 | if (dentry->d_inode) | |
fab728e1 | 1630 | goto out; |
1da177e4 | 1631 | if (fhandle->size == 0) { |
7c513058 | 1632 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1633 | if (error) |
fab728e1 | 1634 | goto out_error; |
1da177e4 | 1635 | } |
5724ab37 | 1636 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1637 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1638 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1639 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1640 | if (error < 0) |
fab728e1 | 1641 | goto out_error; |
1da177e4 | 1642 | } |
1da177e4 | 1643 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1644 | error = PTR_ERR(inode); |
1645 | if (IS_ERR(inode)) | |
fab728e1 TM |
1646 | goto out_error; |
1647 | d_add(dentry, inode); | |
1648 | out: | |
1649 | dput(parent); | |
1da177e4 | 1650 | return 0; |
fab728e1 TM |
1651 | out_error: |
1652 | nfs_mark_for_revalidate(dir); | |
1653 | dput(parent); | |
1654 | return error; | |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | /* | |
1658 | * Following a failed create operation, we drop the dentry rather | |
1659 | * than retain a negative dentry. This avoids a problem in the event | |
1660 | * that the operation succeeded on the server, but an error in the | |
1661 | * reply path made it appear to have failed. | |
1662 | */ | |
1663 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
1664 | struct nameidata *nd) | |
1665 | { | |
1666 | struct iattr attr; | |
1667 | int error; | |
8a0eebf6 | 1668 | int open_flags = 0; |
1da177e4 | 1669 | |
1e7cb3dc CL |
1670 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1671 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1672 | |
1673 | attr.ia_mode = mode; | |
1674 | attr.ia_valid = ATTR_MODE; | |
1675 | ||
8a0eebf6 TM |
1676 | if ((nd->flags & LOOKUP_CREATE) != 0) |
1677 | open_flags = nd->intent.open.flags; | |
1678 | ||
1679 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL); | |
1da177e4 LT |
1680 | if (error != 0) |
1681 | goto out_err; | |
1da177e4 LT |
1682 | return 0; |
1683 | out_err: | |
1da177e4 LT |
1684 | d_drop(dentry); |
1685 | return error; | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | * See comments for nfs_proc_create regarding failed operations. | |
1690 | */ | |
1691 | static int | |
1692 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1693 | { | |
1694 | struct iattr attr; | |
1695 | int status; | |
1696 | ||
1e7cb3dc CL |
1697 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1698 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1699 | |
1700 | if (!new_valid_dev(rdev)) | |
1701 | return -EINVAL; | |
1702 | ||
1703 | attr.ia_mode = mode; | |
1704 | attr.ia_valid = ATTR_MODE; | |
1705 | ||
1da177e4 | 1706 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1707 | if (status != 0) |
1708 | goto out_err; | |
1da177e4 LT |
1709 | return 0; |
1710 | out_err: | |
1da177e4 LT |
1711 | d_drop(dentry); |
1712 | return status; | |
1713 | } | |
1714 | ||
1715 | /* | |
1716 | * See comments for nfs_proc_create regarding failed operations. | |
1717 | */ | |
1718 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1719 | { | |
1720 | struct iattr attr; | |
1721 | int error; | |
1722 | ||
1e7cb3dc CL |
1723 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1724 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1725 | |
1726 | attr.ia_valid = ATTR_MODE; | |
1727 | attr.ia_mode = mode | S_IFDIR; | |
1728 | ||
1da177e4 | 1729 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1730 | if (error != 0) |
1731 | goto out_err; | |
1da177e4 LT |
1732 | return 0; |
1733 | out_err: | |
1734 | d_drop(dentry); | |
1da177e4 LT |
1735 | return error; |
1736 | } | |
1737 | ||
d45b9d8b TM |
1738 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1739 | { | |
1740 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1741 | d_delete(dentry); | |
1742 | } | |
1743 | ||
1da177e4 LT |
1744 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1745 | { | |
1746 | int error; | |
1747 | ||
1e7cb3dc CL |
1748 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1749 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1750 | |
1da177e4 LT |
1751 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1752 | /* Ensure the VFS deletes this inode */ | |
1753 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1754 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1755 | else if (error == -ENOENT) |
1756 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1757 | |
1758 | return error; | |
1759 | } | |
1760 | ||
1da177e4 LT |
1761 | /* |
1762 | * Remove a file after making sure there are no pending writes, | |
1763 | * and after checking that the file has only one user. | |
1764 | * | |
1765 | * We invalidate the attribute cache and free the inode prior to the operation | |
1766 | * to avoid possible races if the server reuses the inode. | |
1767 | */ | |
1768 | static int nfs_safe_remove(struct dentry *dentry) | |
1769 | { | |
1770 | struct inode *dir = dentry->d_parent->d_inode; | |
1771 | struct inode *inode = dentry->d_inode; | |
1772 | int error = -EBUSY; | |
1773 | ||
1774 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1775 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1776 | ||
1777 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1778 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1779 | error = 0; | |
1780 | goto out; | |
1781 | } | |
1782 | ||
1da177e4 | 1783 | if (inode != NULL) { |
cae7a073 | 1784 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1785 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1786 | /* The VFS may want to delete this inode */ | |
1787 | if (error == 0) | |
1b83d707 | 1788 | nfs_drop_nlink(inode); |
5ba7cc48 | 1789 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1790 | } else |
1791 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1792 | if (error == -ENOENT) |
1793 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1794 | out: |
1795 | return error; | |
1796 | } | |
1797 | ||
1798 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1799 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1800 | * | |
1801 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1802 | */ | |
1803 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1804 | { | |
1805 | int error; | |
1806 | int need_rehash = 0; | |
1807 | ||
1808 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1809 | dir->i_ino, dentry->d_name.name); | |
1810 | ||
1da177e4 | 1811 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1812 | if (dentry->d_count > 1) { |
1da177e4 | 1813 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1814 | /* Start asynchronous writeout of the inode */ |
1815 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1816 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1817 | return error; |
1818 | } | |
1819 | if (!d_unhashed(dentry)) { | |
1820 | __d_drop(dentry); | |
1821 | need_rehash = 1; | |
1822 | } | |
1823 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1824 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1825 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1826 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1827 | } else if (need_rehash) | |
1828 | d_rehash(dentry); | |
1da177e4 LT |
1829 | return error; |
1830 | } | |
1831 | ||
873101b3 CL |
1832 | /* |
1833 | * To create a symbolic link, most file systems instantiate a new inode, | |
1834 | * add a page to it containing the path, then write it out to the disk | |
1835 | * using prepare_write/commit_write. | |
1836 | * | |
1837 | * Unfortunately the NFS client can't create the in-core inode first | |
1838 | * because it needs a file handle to create an in-core inode (see | |
1839 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1840 | * symlink request has completed on the server. | |
1841 | * | |
1842 | * So instead we allocate a raw page, copy the symname into it, then do | |
1843 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1844 | * now have a new file handle and can instantiate an in-core NFS inode | |
1845 | * and move the raw page into its mapping. | |
1846 | */ | |
1847 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1848 | { |
873101b3 CL |
1849 | struct pagevec lru_pvec; |
1850 | struct page *page; | |
1851 | char *kaddr; | |
1da177e4 | 1852 | struct iattr attr; |
873101b3 | 1853 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1854 | int error; |
1855 | ||
1856 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1857 | dir->i_ino, dentry->d_name.name, symname); | |
1858 | ||
873101b3 CL |
1859 | if (pathlen > PAGE_SIZE) |
1860 | return -ENAMETOOLONG; | |
1da177e4 | 1861 | |
873101b3 CL |
1862 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1863 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1864 | |
83d93f22 | 1865 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1866 | if (!page) |
873101b3 | 1867 | return -ENOMEM; |
873101b3 CL |
1868 | |
1869 | kaddr = kmap_atomic(page, KM_USER0); | |
1870 | memcpy(kaddr, symname, pathlen); | |
1871 | if (pathlen < PAGE_SIZE) | |
1872 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1873 | kunmap_atomic(kaddr, KM_USER0); | |
1874 | ||
94a6d753 | 1875 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1876 | if (error != 0) { |
1877 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1878 | dir->i_sb->s_id, dir->i_ino, | |
1879 | dentry->d_name.name, symname, error); | |
1da177e4 | 1880 | d_drop(dentry); |
873101b3 | 1881 | __free_page(page); |
873101b3 CL |
1882 | return error; |
1883 | } | |
1884 | ||
1885 | /* | |
1886 | * No big deal if we can't add this page to the page cache here. | |
1887 | * READLINK will get the missing page from the server if needed. | |
1888 | */ | |
1889 | pagevec_init(&lru_pvec, 0); | |
1890 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1891 | GFP_KERNEL)) { | |
39cf8a13 | 1892 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1893 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1894 | SetPageUptodate(page); |
1895 | unlock_page(page); | |
1896 | } else | |
1897 | __free_page(page); | |
1898 | ||
873101b3 | 1899 | return 0; |
1da177e4 LT |
1900 | } |
1901 | ||
1902 | static int | |
1903 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1904 | { | |
1905 | struct inode *inode = old_dentry->d_inode; | |
1906 | int error; | |
1907 | ||
1908 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1909 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1910 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1911 | ||
9a3936aa TM |
1912 | nfs_inode_return_delegation(inode); |
1913 | ||
9697d234 | 1914 | d_drop(dentry); |
1da177e4 | 1915 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1916 | if (error == 0) { |
7de9c6ee | 1917 | ihold(inode); |
9697d234 | 1918 | d_add(dentry, inode); |
cf809556 | 1919 | } |
1da177e4 LT |
1920 | return error; |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * RENAME | |
1925 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1926 | * different file handle for the same inode after a rename (e.g. when | |
1927 | * moving to a different directory). A fail-safe method to do so would | |
1928 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1929 | * rename the old file using the sillyrename stuff. This way, the original | |
1930 | * file in old_dir will go away when the last process iput()s the inode. | |
1931 | * | |
1932 | * FIXED. | |
1933 | * | |
1934 | * It actually works quite well. One needs to have the possibility for | |
1935 | * at least one ".nfs..." file in each directory the file ever gets | |
1936 | * moved or linked to which happens automagically with the new | |
1937 | * implementation that only depends on the dcache stuff instead of | |
1938 | * using the inode layer | |
1939 | * | |
1940 | * Unfortunately, things are a little more complicated than indicated | |
1941 | * above. For a cross-directory move, we want to make sure we can get | |
1942 | * rid of the old inode after the operation. This means there must be | |
1943 | * no pending writes (if it's a file), and the use count must be 1. | |
1944 | * If these conditions are met, we can drop the dentries before doing | |
1945 | * the rename. | |
1946 | */ | |
1947 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1948 | struct inode *new_dir, struct dentry *new_dentry) | |
1949 | { | |
1950 | struct inode *old_inode = old_dentry->d_inode; | |
1951 | struct inode *new_inode = new_dentry->d_inode; | |
1952 | struct dentry *dentry = NULL, *rehash = NULL; | |
1953 | int error = -EBUSY; | |
1954 | ||
1da177e4 LT |
1955 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1956 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1957 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1958 | new_dentry->d_count); |
1da177e4 LT |
1959 | |
1960 | /* | |
28f79a1a MS |
1961 | * For non-directories, check whether the target is busy and if so, |
1962 | * make a copy of the dentry and then do a silly-rename. If the | |
1963 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1964 | * the new target. | |
1da177e4 | 1965 | */ |
27226104 MS |
1966 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1967 | /* | |
1968 | * To prevent any new references to the target during the | |
1969 | * rename, we unhash the dentry in advance. | |
1970 | */ | |
1971 | if (!d_unhashed(new_dentry)) { | |
1972 | d_drop(new_dentry); | |
1973 | rehash = new_dentry; | |
1974 | } | |
1da177e4 | 1975 | |
b7ab39f6 | 1976 | if (new_dentry->d_count > 2) { |
27226104 MS |
1977 | int err; |
1978 | ||
1979 | /* copy the target dentry's name */ | |
1980 | dentry = d_alloc(new_dentry->d_parent, | |
1981 | &new_dentry->d_name); | |
1982 | if (!dentry) | |
1983 | goto out; | |
1984 | ||
1985 | /* silly-rename the existing target ... */ | |
1986 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1987 | if (err) |
27226104 | 1988 | goto out; |
24e93025 MS |
1989 | |
1990 | new_dentry = dentry; | |
56335936 | 1991 | rehash = NULL; |
24e93025 | 1992 | new_inode = NULL; |
27226104 | 1993 | } |
b1e4adf4 | 1994 | } |
1da177e4 | 1995 | |
cae7a073 | 1996 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1997 | if (new_inode != NULL) |
24174119 | 1998 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1999 | |
1da177e4 LT |
2000 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
2001 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 2002 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
2003 | out: |
2004 | if (rehash) | |
2005 | d_rehash(rehash); | |
2006 | if (!error) { | |
b1e4adf4 TM |
2007 | if (new_inode != NULL) |
2008 | nfs_drop_nlink(new_inode); | |
349457cc | 2009 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
2010 | nfs_set_verifier(new_dentry, |
2011 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
2012 | } else if (error == -ENOENT) |
2013 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
2014 | |
2015 | /* new dentry created? */ | |
2016 | if (dentry) | |
2017 | dput(dentry); | |
1da177e4 LT |
2018 | return error; |
2019 | } | |
2020 | ||
cfcea3e8 TM |
2021 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2022 | static LIST_HEAD(nfs_access_lru_list); | |
2023 | static atomic_long_t nfs_access_nr_entries; | |
2024 | ||
1c3c07e9 TM |
2025 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2026 | { | |
2027 | put_rpccred(entry->cred); | |
2028 | kfree(entry); | |
cfcea3e8 TM |
2029 | smp_mb__before_atomic_dec(); |
2030 | atomic_long_dec(&nfs_access_nr_entries); | |
2031 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
2032 | } |
2033 | ||
1a81bb8a TM |
2034 | static void nfs_access_free_list(struct list_head *head) |
2035 | { | |
2036 | struct nfs_access_entry *cache; | |
2037 | ||
2038 | while (!list_empty(head)) { | |
2039 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2040 | list_del(&cache->lru); | |
2041 | nfs_access_free_entry(cache); | |
2042 | } | |
2043 | } | |
2044 | ||
7f8275d0 | 2045 | int nfs_access_cache_shrinker(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask) |
979df72e TM |
2046 | { |
2047 | LIST_HEAD(head); | |
aa510da5 | 2048 | struct nfs_inode *nfsi, *next; |
979df72e TM |
2049 | struct nfs_access_entry *cache; |
2050 | ||
61d5eb29 TM |
2051 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
2052 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 2053 | |
a50f7951 | 2054 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2055 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2056 | struct inode *inode; |
2057 | ||
2058 | if (nr_to_scan-- == 0) | |
2059 | break; | |
9c7e7e23 | 2060 | inode = &nfsi->vfs_inode; |
979df72e TM |
2061 | spin_lock(&inode->i_lock); |
2062 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2063 | goto remove_lru_entry; | |
2064 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2065 | struct nfs_access_entry, lru); | |
2066 | list_move(&cache->lru, &head); | |
2067 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
2068 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
2069 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2070 | &nfs_access_lru_list); | |
2071 | else { | |
2072 | remove_lru_entry: | |
2073 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2074 | smp_mb__before_clear_bit(); |
979df72e | 2075 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2076 | smp_mb__after_clear_bit(); |
979df72e | 2077 | } |
59844a9b | 2078 | spin_unlock(&inode->i_lock); |
979df72e TM |
2079 | } |
2080 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2081 | nfs_access_free_list(&head); |
979df72e TM |
2082 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2083 | } | |
2084 | ||
1a81bb8a | 2085 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2086 | { |
1c3c07e9 | 2087 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2088 | struct rb_node *n; |
1c3c07e9 TM |
2089 | struct nfs_access_entry *entry; |
2090 | ||
2091 | /* Unhook entries from the cache */ | |
2092 | while ((n = rb_first(root_node)) != NULL) { | |
2093 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2094 | rb_erase(n, root_node); | |
1a81bb8a | 2095 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2096 | } |
2097 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2098 | } |
2099 | ||
1c3c07e9 | 2100 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2101 | { |
1a81bb8a TM |
2102 | LIST_HEAD(head); |
2103 | ||
2104 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2105 | return; | |
cfcea3e8 | 2106 | /* Remove from global LRU init */ |
1a81bb8a TM |
2107 | spin_lock(&nfs_access_lru_lock); |
2108 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2109 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2110 | |
1c3c07e9 | 2111 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2112 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2113 | spin_unlock(&inode->i_lock); | |
2114 | spin_unlock(&nfs_access_lru_lock); | |
2115 | nfs_access_free_list(&head); | |
1c3c07e9 | 2116 | } |
1da177e4 | 2117 | |
1c3c07e9 TM |
2118 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2119 | { | |
2120 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2121 | struct nfs_access_entry *entry; | |
2122 | ||
2123 | while (n != NULL) { | |
2124 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2125 | ||
2126 | if (cred < entry->cred) | |
2127 | n = n->rb_left; | |
2128 | else if (cred > entry->cred) | |
2129 | n = n->rb_right; | |
2130 | else | |
2131 | return entry; | |
1da177e4 | 2132 | } |
1c3c07e9 TM |
2133 | return NULL; |
2134 | } | |
2135 | ||
af22f94a | 2136 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2137 | { |
2138 | struct nfs_inode *nfsi = NFS_I(inode); | |
2139 | struct nfs_access_entry *cache; | |
2140 | int err = -ENOENT; | |
2141 | ||
dc59250c | 2142 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2143 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2144 | goto out_zap; | |
2145 | cache = nfs_access_search_rbtree(inode, cred); | |
2146 | if (cache == NULL) | |
2147 | goto out; | |
b4d2314b | 2148 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2149 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2150 | goto out_stale; |
2151 | res->jiffies = cache->jiffies; | |
2152 | res->cred = cache->cred; | |
2153 | res->mask = cache->mask; | |
cfcea3e8 | 2154 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2155 | err = 0; |
2156 | out: | |
2157 | spin_unlock(&inode->i_lock); | |
2158 | return err; | |
2159 | out_stale: | |
2160 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2161 | list_del(&cache->lru); |
1c3c07e9 TM |
2162 | spin_unlock(&inode->i_lock); |
2163 | nfs_access_free_entry(cache); | |
2164 | return -ENOENT; | |
2165 | out_zap: | |
1a81bb8a TM |
2166 | spin_unlock(&inode->i_lock); |
2167 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2168 | return -ENOENT; |
2169 | } | |
2170 | ||
2171 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2172 | { | |
cfcea3e8 TM |
2173 | struct nfs_inode *nfsi = NFS_I(inode); |
2174 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2175 | struct rb_node **p = &root_node->rb_node; |
2176 | struct rb_node *parent = NULL; | |
2177 | struct nfs_access_entry *entry; | |
2178 | ||
2179 | spin_lock(&inode->i_lock); | |
2180 | while (*p != NULL) { | |
2181 | parent = *p; | |
2182 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2183 | ||
2184 | if (set->cred < entry->cred) | |
2185 | p = &parent->rb_left; | |
2186 | else if (set->cred > entry->cred) | |
2187 | p = &parent->rb_right; | |
2188 | else | |
2189 | goto found; | |
2190 | } | |
2191 | rb_link_node(&set->rb_node, parent, p); | |
2192 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2193 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2194 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2195 | return; |
2196 | found: | |
2197 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2198 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2199 | list_del(&entry->lru); | |
1c3c07e9 TM |
2200 | spin_unlock(&inode->i_lock); |
2201 | nfs_access_free_entry(entry); | |
2202 | } | |
2203 | ||
af22f94a | 2204 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2205 | { |
2206 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2207 | if (cache == NULL) | |
2208 | return; | |
2209 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2210 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2211 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2212 | cache->mask = set->mask; |
1c3c07e9 TM |
2213 | |
2214 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2215 | |
2216 | /* Update accounting */ | |
2217 | smp_mb__before_atomic_inc(); | |
2218 | atomic_long_inc(&nfs_access_nr_entries); | |
2219 | smp_mb__after_atomic_inc(); | |
2220 | ||
2221 | /* Add inode to global LRU list */ | |
1a81bb8a | 2222 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2223 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2224 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2225 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2226 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2227 | spin_unlock(&nfs_access_lru_lock); |
2228 | } | |
1da177e4 LT |
2229 | } |
2230 | ||
2231 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2232 | { | |
2233 | struct nfs_access_entry cache; | |
2234 | int status; | |
2235 | ||
2236 | status = nfs_access_get_cached(inode, cred, &cache); | |
2237 | if (status == 0) | |
2238 | goto out; | |
2239 | ||
2240 | /* Be clever: ask server to check for all possible rights */ | |
2241 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2242 | cache.cred = cred; | |
2243 | cache.jiffies = jiffies; | |
2244 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2245 | if (status != 0) { |
2246 | if (status == -ESTALE) { | |
2247 | nfs_zap_caches(inode); | |
2248 | if (!S_ISDIR(inode->i_mode)) | |
2249 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2250 | } | |
1da177e4 | 2251 | return status; |
a71ee337 | 2252 | } |
1da177e4 LT |
2253 | nfs_access_add_cache(inode, &cache); |
2254 | out: | |
e6305c43 | 2255 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2256 | return 0; |
2257 | return -EACCES; | |
2258 | } | |
2259 | ||
af22f94a TM |
2260 | static int nfs_open_permission_mask(int openflags) |
2261 | { | |
2262 | int mask = 0; | |
2263 | ||
2264 | if (openflags & FMODE_READ) | |
2265 | mask |= MAY_READ; | |
2266 | if (openflags & FMODE_WRITE) | |
2267 | mask |= MAY_WRITE; | |
2268 | if (openflags & FMODE_EXEC) | |
2269 | mask |= MAY_EXEC; | |
2270 | return mask; | |
2271 | } | |
2272 | ||
2273 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2274 | { | |
2275 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2276 | } | |
2277 | ||
b74c79e9 | 2278 | int nfs_permission(struct inode *inode, int mask, unsigned int flags) |
1da177e4 LT |
2279 | { |
2280 | struct rpc_cred *cred; | |
2281 | int res = 0; | |
2282 | ||
b74c79e9 NP |
2283 | if (flags & IPERM_FLAG_RCU) |
2284 | return -ECHILD; | |
2285 | ||
91d5b470 CL |
2286 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2287 | ||
e6305c43 | 2288 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2289 | goto out; |
2290 | /* Is this sys_access() ? */ | |
9cfcac81 | 2291 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2292 | goto force_lookup; |
2293 | ||
2294 | switch (inode->i_mode & S_IFMT) { | |
2295 | case S_IFLNK: | |
2296 | goto out; | |
2297 | case S_IFREG: | |
2298 | /* NFSv4 has atomic_open... */ | |
2299 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2300 | && (mask & MAY_OPEN) |
2301 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2302 | goto out; |
2303 | break; | |
2304 | case S_IFDIR: | |
2305 | /* | |
2306 | * Optimize away all write operations, since the server | |
2307 | * will check permissions when we perform the op. | |
2308 | */ | |
2309 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2310 | goto out; | |
2311 | } | |
2312 | ||
2313 | force_lookup: | |
1da177e4 LT |
2314 | if (!NFS_PROTO(inode)->access) |
2315 | goto out_notsup; | |
2316 | ||
98a8e323 | 2317 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2318 | if (!IS_ERR(cred)) { |
2319 | res = nfs_do_access(inode, cred, mask); | |
2320 | put_rpccred(cred); | |
2321 | } else | |
2322 | res = PTR_ERR(cred); | |
1da177e4 | 2323 | out: |
f696a365 MS |
2324 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2325 | res = -EACCES; | |
2326 | ||
1e7cb3dc CL |
2327 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2328 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2329 | return res; |
2330 | out_notsup: | |
2331 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2332 | if (res == 0) | |
b74c79e9 | 2333 | res = generic_permission(inode, mask, flags, NULL); |
1e7cb3dc | 2334 | goto out; |
1da177e4 LT |
2335 | } |
2336 | ||
2337 | /* | |
2338 | * Local variables: | |
2339 | * version-control: t | |
2340 | * kept-new-versions: 5 | |
2341 | * End: | |
2342 | */ |