Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
20 | #include <linux/time.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/stat.h> | |
23 | #include <linux/fcntl.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/sunrpc/clnt.h> | |
29 | #include <linux/nfs_fs.h> | |
30 | #include <linux/nfs_mount.h> | |
31 | #include <linux/pagemap.h> | |
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 | 48 | static int nfs_readdir(struct file *, void *, filldir_t); |
00cd8dd3 | 49 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); |
ebfc3b49 | 50 | static int nfs_create(struct inode *, struct dentry *, umode_t, bool); |
18bb1db3 | 51 | static int nfs_mkdir(struct inode *, struct dentry *, umode_t); |
1da177e4 LT |
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 *); | |
1a67aafb | 56 | static int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
1da177e4 LT |
57 | static int nfs_rename(struct inode *, struct dentry *, |
58 | struct inode *, struct dentry *); | |
02c24a82 | 59 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, 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 | ||
d9585277 | 114 | static int nfs_atomic_open(struct inode *, struct dentry *, |
30d90494 | 115 | struct file *, unsigned, umode_t, |
d9585277 | 116 | int *); |
92e1d5be | 117 | const struct inode_operations nfs4_dir_inode_operations = { |
8867fe58 | 118 | .create = nfs_create, |
0dd2b474 MS |
119 | .lookup = nfs_lookup, |
120 | .atomic_open = nfs_atomic_open, | |
1da177e4 LT |
121 | .link = nfs_link, |
122 | .unlink = nfs_unlink, | |
123 | .symlink = nfs_symlink, | |
124 | .mkdir = nfs_mkdir, | |
125 | .rmdir = nfs_rmdir, | |
126 | .mknod = nfs_mknod, | |
127 | .rename = nfs_rename, | |
128 | .permission = nfs_permission, | |
129 | .getattr = nfs_getattr, | |
130 | .setattr = nfs_setattr, | |
64c2ce8b AK |
131 | .getxattr = generic_getxattr, |
132 | .setxattr = generic_setxattr, | |
133 | .listxattr = generic_listxattr, | |
134 | .removexattr = generic_removexattr, | |
1da177e4 LT |
135 | }; |
136 | ||
137 | #endif /* CONFIG_NFS_V4 */ | |
138 | ||
0c030806 | 139 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
140 | { |
141 | struct nfs_open_dir_context *ctx; | |
142 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
143 | if (ctx != NULL) { | |
8ef2ce3e | 144 | ctx->duped = 0; |
0c030806 | 145 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 146 | ctx->dir_cookie = 0; |
8ef2ce3e | 147 | ctx->dup_cookie = 0; |
480c2006 | 148 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
149 | return ctx; |
150 | } | |
151 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
152 | } |
153 | ||
154 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
155 | { | |
156 | put_rpccred(ctx->cred); | |
157 | kfree(ctx); | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* |
161 | * Open file | |
162 | */ | |
163 | static int | |
164 | nfs_opendir(struct inode *inode, struct file *filp) | |
165 | { | |
480c2006 BS |
166 | int res = 0; |
167 | struct nfs_open_dir_context *ctx; | |
168 | struct rpc_cred *cred; | |
1da177e4 | 169 | |
6da24bc9 | 170 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
171 | filp->f_path.dentry->d_parent->d_name.name, |
172 | filp->f_path.dentry->d_name.name); | |
173 | ||
174 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 175 | |
480c2006 BS |
176 | cred = rpc_lookup_cred(); |
177 | if (IS_ERR(cred)) | |
178 | return PTR_ERR(cred); | |
0c030806 | 179 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
180 | if (IS_ERR(ctx)) { |
181 | res = PTR_ERR(ctx); | |
182 | goto out; | |
183 | } | |
184 | filp->private_data = ctx; | |
f5a73672 NB |
185 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
186 | /* This is a mountpoint, so d_revalidate will never | |
187 | * have been called, so we need to refresh the | |
188 | * inode (for close-open consistency) ourselves. | |
189 | */ | |
190 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
191 | } | |
480c2006 BS |
192 | out: |
193 | put_rpccred(cred); | |
1da177e4 LT |
194 | return res; |
195 | } | |
196 | ||
480c2006 BS |
197 | static int |
198 | nfs_closedir(struct inode *inode, struct file *filp) | |
199 | { | |
200 | put_nfs_open_dir_context(filp->private_data); | |
201 | return 0; | |
202 | } | |
203 | ||
d1bacf9e BS |
204 | struct nfs_cache_array_entry { |
205 | u64 cookie; | |
206 | u64 ino; | |
207 | struct qstr string; | |
0b26a0bf | 208 | unsigned char d_type; |
d1bacf9e BS |
209 | }; |
210 | ||
211 | struct nfs_cache_array { | |
88b8e133 | 212 | int size; |
d1bacf9e BS |
213 | int eof_index; |
214 | u64 last_cookie; | |
215 | struct nfs_cache_array_entry array[0]; | |
216 | }; | |
217 | ||
573c4e1e | 218 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
219 | typedef struct { |
220 | struct file *file; | |
221 | struct page *page; | |
222 | unsigned long page_index; | |
f0dd2136 | 223 | u64 *dir_cookie; |
0aded708 | 224 | u64 last_cookie; |
f0dd2136 | 225 | loff_t current_index; |
1da177e4 | 226 | decode_dirent_t decode; |
d1bacf9e | 227 | |
1f4eab7e | 228 | unsigned long timestamp; |
4704f0e2 | 229 | unsigned long gencount; |
d1bacf9e BS |
230 | unsigned int cache_entry_index; |
231 | unsigned int plus:1; | |
232 | unsigned int eof:1; | |
1da177e4 LT |
233 | } nfs_readdir_descriptor_t; |
234 | ||
d1bacf9e BS |
235 | /* |
236 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
237 | */ |
238 | static | |
d1bacf9e BS |
239 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
240 | { | |
8cd51a0c | 241 | void *ptr; |
d1bacf9e BS |
242 | if (page == NULL) |
243 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
244 | ptr = kmap(page); |
245 | if (ptr == NULL) | |
246 | return ERR_PTR(-ENOMEM); | |
247 | return ptr; | |
d1bacf9e BS |
248 | } |
249 | ||
250 | static | |
251 | void nfs_readdir_release_array(struct page *page) | |
252 | { | |
253 | kunmap(page); | |
254 | } | |
255 | ||
256 | /* | |
257 | * we are freeing strings created by nfs_add_to_readdir_array() | |
258 | */ | |
259 | static | |
11de3b11 | 260 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 261 | { |
11de3b11 | 262 | struct nfs_cache_array *array; |
d1bacf9e | 263 | int i; |
8cd51a0c | 264 | |
2b86ce2d | 265 | array = kmap_atomic(page); |
d1bacf9e BS |
266 | for (i = 0; i < array->size; i++) |
267 | kfree(array->array[i].string.name); | |
2b86ce2d | 268 | kunmap_atomic(array); |
d1bacf9e BS |
269 | } |
270 | ||
271 | /* | |
272 | * the caller is responsible for freeing qstr.name | |
273 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
274 | * nfs_clear_readdir_array() | |
275 | */ | |
276 | static | |
4a201d6e | 277 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
278 | { |
279 | string->len = len; | |
280 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
281 | if (string->name == NULL) |
282 | return -ENOMEM; | |
04e4bd1c CM |
283 | /* |
284 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
285 | * in a page cache page which kmemleak does not scan. | |
286 | */ | |
287 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
288 | string->hash = full_name_hash(name, len); |
289 | return 0; | |
d1bacf9e BS |
290 | } |
291 | ||
292 | static | |
293 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
294 | { | |
295 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
296 | struct nfs_cache_array_entry *cache_entry; |
297 | int ret; | |
298 | ||
d1bacf9e BS |
299 | if (IS_ERR(array)) |
300 | return PTR_ERR(array); | |
3020093f TM |
301 | |
302 | cache_entry = &array->array[array->size]; | |
303 | ||
304 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 305 | ret = -ENOSPC; |
3020093f | 306 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 307 | goto out; |
d1bacf9e | 308 | |
4a201d6e TM |
309 | cache_entry->cookie = entry->prev_cookie; |
310 | cache_entry->ino = entry->ino; | |
0b26a0bf | 311 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
312 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
313 | if (ret) | |
314 | goto out; | |
d1bacf9e | 315 | array->last_cookie = entry->cookie; |
8cd51a0c | 316 | array->size++; |
47c716cb | 317 | if (entry->eof != 0) |
d1bacf9e | 318 | array->eof_index = array->size; |
4a201d6e | 319 | out: |
d1bacf9e | 320 | nfs_readdir_release_array(page); |
4a201d6e | 321 | return ret; |
d1bacf9e BS |
322 | } |
323 | ||
324 | static | |
325 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
326 | { | |
327 | loff_t diff = desc->file->f_pos - desc->current_index; | |
328 | unsigned int index; | |
329 | ||
330 | if (diff < 0) | |
331 | goto out_eof; | |
332 | if (diff >= array->size) { | |
8cd51a0c | 333 | if (array->eof_index >= 0) |
d1bacf9e | 334 | goto out_eof; |
d1bacf9e BS |
335 | return -EAGAIN; |
336 | } | |
337 | ||
338 | index = (unsigned int)diff; | |
339 | *desc->dir_cookie = array->array[index].cookie; | |
340 | desc->cache_entry_index = index; | |
d1bacf9e BS |
341 | return 0; |
342 | out_eof: | |
343 | desc->eof = 1; | |
344 | return -EBADCOOKIE; | |
345 | } | |
346 | ||
347 | static | |
348 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
349 | { | |
350 | int i; | |
8ef2ce3e | 351 | loff_t new_pos; |
d1bacf9e BS |
352 | int status = -EAGAIN; |
353 | ||
354 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 355 | if (array->array[i].cookie == *desc->dir_cookie) { |
0c030806 TM |
356 | struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode); |
357 | struct nfs_open_dir_context *ctx = desc->file->private_data; | |
358 | ||
8ef2ce3e | 359 | new_pos = desc->current_index + i; |
0c030806 TM |
360 | if (ctx->attr_gencount != nfsi->attr_gencount |
361 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
362 | ctx->duped = 0; | |
363 | ctx->attr_gencount = nfsi->attr_gencount; | |
364 | } else if (new_pos < desc->file->f_pos) { | |
365 | if (ctx->duped > 0 | |
366 | && ctx->dup_cookie == *desc->dir_cookie) { | |
367 | if (printk_ratelimit()) { | |
368 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
369 | "Please contact your server vendor. " | |
374e4e3e | 370 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
371 | desc->file->f_dentry->d_parent->d_name.name, |
372 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 373 | array->array[i].string.name, |
0c030806 TM |
374 | *desc->dir_cookie); |
375 | } | |
376 | status = -ELOOP; | |
377 | goto out; | |
378 | } | |
8ef2ce3e | 379 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 380 | ctx->duped = -1; |
8ef2ce3e BS |
381 | } |
382 | desc->file->f_pos = new_pos; | |
d1bacf9e | 383 | desc->cache_entry_index = i; |
47c716cb | 384 | return 0; |
d1bacf9e BS |
385 | } |
386 | } | |
47c716cb | 387 | if (array->eof_index >= 0) { |
8cd51a0c | 388 | status = -EBADCOOKIE; |
18fb5fe4 TM |
389 | if (*desc->dir_cookie == array->last_cookie) |
390 | desc->eof = 1; | |
8cd51a0c | 391 | } |
0c030806 | 392 | out: |
d1bacf9e BS |
393 | return status; |
394 | } | |
395 | ||
396 | static | |
397 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
398 | { | |
399 | struct nfs_cache_array *array; | |
47c716cb | 400 | int status; |
d1bacf9e BS |
401 | |
402 | array = nfs_readdir_get_array(desc->page); | |
403 | if (IS_ERR(array)) { | |
404 | status = PTR_ERR(array); | |
405 | goto out; | |
406 | } | |
407 | ||
408 | if (*desc->dir_cookie == 0) | |
409 | status = nfs_readdir_search_for_pos(array, desc); | |
410 | else | |
411 | status = nfs_readdir_search_for_cookie(array, desc); | |
412 | ||
47c716cb | 413 | if (status == -EAGAIN) { |
0aded708 | 414 | desc->last_cookie = array->last_cookie; |
e47c085a | 415 | desc->current_index += array->size; |
47c716cb TM |
416 | desc->page_index++; |
417 | } | |
d1bacf9e BS |
418 | nfs_readdir_release_array(desc->page); |
419 | out: | |
420 | return status; | |
421 | } | |
422 | ||
423 | /* Fill a page with xdr information before transferring to the cache page */ | |
424 | static | |
56e4ebf8 | 425 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 426 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 427 | { |
480c2006 BS |
428 | struct nfs_open_dir_context *ctx = file->private_data; |
429 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 430 | unsigned long timestamp, gencount; |
1da177e4 LT |
431 | int error; |
432 | ||
1da177e4 LT |
433 | again: |
434 | timestamp = jiffies; | |
4704f0e2 | 435 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 436 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
437 | NFS_SERVER(inode)->dtsize, desc->plus); |
438 | if (error < 0) { | |
439 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
440 | if (error == -ENOTSUPP && desc->plus) { | |
441 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 442 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
443 | desc->plus = 0; |
444 | goto again; | |
445 | } | |
446 | goto error; | |
447 | } | |
1f4eab7e | 448 | desc->timestamp = timestamp; |
4704f0e2 | 449 | desc->gencount = gencount; |
d1bacf9e BS |
450 | error: |
451 | return error; | |
1da177e4 LT |
452 | } |
453 | ||
573c4e1e CL |
454 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
455 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 456 | { |
573c4e1e | 457 | int error; |
1da177e4 | 458 | |
573c4e1e CL |
459 | error = desc->decode(xdr, entry, desc->plus); |
460 | if (error) | |
461 | return error; | |
d1bacf9e BS |
462 | entry->fattr->time_start = desc->timestamp; |
463 | entry->fattr->gencount = desc->gencount; | |
464 | return 0; | |
1da177e4 LT |
465 | } |
466 | ||
d39ab9de BS |
467 | static |
468 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
469 | { | |
d39ab9de BS |
470 | if (dentry->d_inode == NULL) |
471 | goto different; | |
37a09f07 | 472 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
473 | goto different; |
474 | return 1; | |
475 | different: | |
476 | return 0; | |
477 | } | |
478 | ||
d69ee9b8 TM |
479 | static |
480 | bool nfs_use_readdirplus(struct inode *dir, struct file *filp) | |
481 | { | |
482 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
483 | return false; | |
484 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
485 | return true; | |
486 | if (filp->f_pos == 0) | |
487 | return true; | |
488 | return false; | |
489 | } | |
490 | ||
491 | /* | |
492 | * This function is called by the lookup code to request the use of | |
493 | * readdirplus to accelerate any future lookups in the same | |
494 | * directory. | |
495 | */ | |
496 | static | |
497 | void nfs_advise_use_readdirplus(struct inode *dir) | |
498 | { | |
499 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
500 | } | |
501 | ||
d39ab9de BS |
502 | static |
503 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
504 | { | |
26fe5750 | 505 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
506 | struct dentry *dentry; |
507 | struct dentry *alias; | |
d39ab9de BS |
508 | struct inode *dir = parent->d_inode; |
509 | struct inode *inode; | |
510 | ||
4a201d6e TM |
511 | if (filename.name[0] == '.') { |
512 | if (filename.len == 1) | |
513 | return; | |
514 | if (filename.len == 2 && filename.name[1] == '.') | |
515 | return; | |
516 | } | |
517 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 518 | |
4a201d6e | 519 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
520 | if (dentry != NULL) { |
521 | if (nfs_same_file(dentry, entry)) { | |
522 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
523 | goto out; | |
524 | } else { | |
525 | d_drop(dentry); | |
526 | dput(dentry); | |
527 | } | |
528 | } | |
529 | ||
530 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
531 | if (dentry == NULL) |
532 | return; | |
533 | ||
d39ab9de BS |
534 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
535 | if (IS_ERR(inode)) | |
536 | goto out; | |
537 | ||
538 | alias = d_materialise_unique(dentry, inode); | |
539 | if (IS_ERR(alias)) | |
540 | goto out; | |
541 | else if (alias) { | |
542 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
543 | dput(alias); | |
544 | } else | |
545 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
546 | ||
547 | out: | |
548 | dput(dentry); | |
d39ab9de BS |
549 | } |
550 | ||
d1bacf9e BS |
551 | /* Perform conversion from xdr to cache array */ |
552 | static | |
8cd51a0c | 553 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 554 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 555 | { |
babddc72 | 556 | struct xdr_stream stream; |
f7da7a12 | 557 | struct xdr_buf buf; |
6650239a | 558 | struct page *scratch; |
99424380 | 559 | struct nfs_cache_array *array; |
5c346854 TM |
560 | unsigned int count = 0; |
561 | int status; | |
babddc72 | 562 | |
6650239a TM |
563 | scratch = alloc_page(GFP_KERNEL); |
564 | if (scratch == NULL) | |
565 | return -ENOMEM; | |
babddc72 | 566 | |
f7da7a12 | 567 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 568 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
569 | |
570 | do { | |
571 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
572 | if (status != 0) { |
573 | if (status == -EAGAIN) | |
574 | status = 0; | |
99424380 | 575 | break; |
8cd51a0c | 576 | } |
99424380 | 577 | |
5c346854 TM |
578 | count++; |
579 | ||
47c716cb | 580 | if (desc->plus != 0) |
d39ab9de | 581 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
582 | |
583 | status = nfs_readdir_add_to_array(entry, page); | |
584 | if (status != 0) | |
585 | break; | |
99424380 BS |
586 | } while (!entry->eof); |
587 | ||
47c716cb | 588 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 589 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
590 | if (!IS_ERR(array)) { |
591 | array->eof_index = array->size; | |
592 | status = 0; | |
593 | nfs_readdir_release_array(page); | |
5c346854 TM |
594 | } else |
595 | status = PTR_ERR(array); | |
1da177e4 | 596 | } |
6650239a TM |
597 | |
598 | put_page(scratch); | |
8cd51a0c | 599 | return status; |
56e4ebf8 BS |
600 | } |
601 | ||
602 | static | |
603 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
604 | { | |
605 | unsigned int i; | |
606 | for (i = 0; i < npages; i++) | |
607 | put_page(pages[i]); | |
608 | } | |
609 | ||
610 | static | |
611 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
612 | unsigned int npages) | |
613 | { | |
56e4ebf8 BS |
614 | nfs_readdir_free_pagearray(pages, npages); |
615 | } | |
616 | ||
617 | /* | |
618 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
619 | * to nfs_readdir_free_large_page | |
620 | */ | |
621 | static | |
6650239a | 622 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 623 | { |
56e4ebf8 BS |
624 | unsigned int i; |
625 | ||
626 | for (i = 0; i < npages; i++) { | |
627 | struct page *page = alloc_page(GFP_KERNEL); | |
628 | if (page == NULL) | |
629 | goto out_freepages; | |
630 | pages[i] = page; | |
631 | } | |
6650239a | 632 | return 0; |
56e4ebf8 | 633 | |
56e4ebf8 BS |
634 | out_freepages: |
635 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 636 | return -ENOMEM; |
1da177e4 LT |
637 | } |
638 | ||
d1bacf9e BS |
639 | static |
640 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 641 | { |
56e4ebf8 BS |
642 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
643 | void *pages_ptr = NULL; | |
d1bacf9e BS |
644 | struct nfs_entry entry; |
645 | struct file *file = desc->file; | |
646 | struct nfs_cache_array *array; | |
8cd51a0c | 647 | int status = -ENOMEM; |
56e4ebf8 | 648 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
649 | |
650 | entry.prev_cookie = 0; | |
0aded708 | 651 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
652 | entry.eof = 0; |
653 | entry.fh = nfs_alloc_fhandle(); | |
654 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 655 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
656 | if (entry.fh == NULL || entry.fattr == NULL) |
657 | goto out; | |
00a92642 | 658 | |
d1bacf9e | 659 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
660 | if (IS_ERR(array)) { |
661 | status = PTR_ERR(array); | |
662 | goto out; | |
663 | } | |
d1bacf9e BS |
664 | memset(array, 0, sizeof(struct nfs_cache_array)); |
665 | array->eof_index = -1; | |
00a92642 | 666 | |
6650239a TM |
667 | status = nfs_readdir_large_page(pages, array_size); |
668 | if (status < 0) | |
d1bacf9e BS |
669 | goto out_release_array; |
670 | do { | |
ac396128 | 671 | unsigned int pglen; |
56e4ebf8 | 672 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 673 | |
d1bacf9e | 674 | if (status < 0) |
00a92642 | 675 | break; |
ac396128 | 676 | pglen = status; |
6650239a | 677 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
678 | if (status < 0) { |
679 | if (status == -ENOSPC) | |
680 | status = 0; | |
681 | break; | |
682 | } | |
683 | } while (array->eof_index < 0); | |
d1bacf9e | 684 | |
56e4ebf8 | 685 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
686 | out_release_array: |
687 | nfs_readdir_release_array(page); | |
688 | out: | |
689 | nfs_free_fattr(entry.fattr); | |
690 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
691 | return status; |
692 | } | |
693 | ||
694 | /* | |
d1bacf9e BS |
695 | * Now we cache directories properly, by converting xdr information |
696 | * to an array that can be used for lookups later. This results in | |
697 | * fewer cache pages, since we can store more information on each page. | |
698 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 699 | */ |
d1bacf9e BS |
700 | static |
701 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 702 | { |
01cce933 | 703 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 704 | int ret; |
1da177e4 | 705 | |
8cd51a0c TM |
706 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
707 | if (ret < 0) | |
d1bacf9e BS |
708 | goto error; |
709 | SetPageUptodate(page); | |
1da177e4 | 710 | |
d1bacf9e BS |
711 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
712 | /* Should never happen */ | |
713 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 714 | } |
d1bacf9e BS |
715 | unlock_page(page); |
716 | return 0; | |
717 | error: | |
718 | unlock_page(page); | |
8cd51a0c | 719 | return ret; |
d1bacf9e | 720 | } |
1da177e4 | 721 | |
d1bacf9e BS |
722 | static |
723 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
724 | { | |
11de3b11 TM |
725 | if (!desc->page->mapping) |
726 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
727 | page_cache_release(desc->page); |
728 | desc->page = NULL; | |
729 | } | |
730 | ||
731 | static | |
732 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
733 | { | |
8cd51a0c | 734 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 735 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
736 | } |
737 | ||
738 | /* | |
d1bacf9e | 739 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 740 | */ |
d1bacf9e BS |
741 | static |
742 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
743 | { | |
744 | int res; | |
745 | ||
746 | desc->page = get_cache_page(desc); | |
747 | if (IS_ERR(desc->page)) | |
748 | return PTR_ERR(desc->page); | |
749 | ||
750 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
751 | if (res != 0) |
752 | cache_page_release(desc); | |
d1bacf9e BS |
753 | return res; |
754 | } | |
755 | ||
756 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
757 | static inline |
758 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
759 | { | |
8cd51a0c | 760 | int res; |
d1bacf9e | 761 | |
0aded708 | 762 | if (desc->page_index == 0) { |
8cd51a0c | 763 | desc->current_index = 0; |
0aded708 TM |
764 | desc->last_cookie = 0; |
765 | } | |
47c716cb | 766 | do { |
d1bacf9e | 767 | res = find_cache_page(desc); |
47c716cb | 768 | } while (res == -EAGAIN); |
1da177e4 LT |
769 | return res; |
770 | } | |
771 | ||
1da177e4 LT |
772 | /* |
773 | * Once we've found the start of the dirent within a page: fill 'er up... | |
774 | */ | |
775 | static | |
776 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
777 | filldir_t filldir) | |
778 | { | |
779 | struct file *file = desc->file; | |
d1bacf9e BS |
780 | int i = 0; |
781 | int res = 0; | |
782 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
783 | struct nfs_open_dir_context *ctx = file->private_data; |
784 | ||
d1bacf9e | 785 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
786 | if (IS_ERR(array)) { |
787 | res = PTR_ERR(array); | |
788 | goto out; | |
789 | } | |
d1bacf9e BS |
790 | |
791 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 792 | struct nfs_cache_array_entry *ent; |
1da177e4 | 793 | |
ece0b423 TM |
794 | ent = &array->array[i]; |
795 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
796 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
797 | ent->d_type) < 0) { | |
ece0b423 | 798 | desc->eof = 1; |
1da177e4 | 799 | break; |
ece0b423 | 800 | } |
00a92642 | 801 | file->f_pos++; |
d1bacf9e BS |
802 | if (i < (array->size-1)) |
803 | *desc->dir_cookie = array->array[i+1].cookie; | |
804 | else | |
805 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
806 | if (ctx->duped != 0) |
807 | ctx->duped = 1; | |
1da177e4 | 808 | } |
47c716cb | 809 | if (array->eof_index >= 0) |
8cd51a0c | 810 | desc->eof = 1; |
d1bacf9e BS |
811 | |
812 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 813 | out: |
d1bacf9e | 814 | cache_page_release(desc); |
1e7cb3dc CL |
815 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
816 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
817 | return res; |
818 | } | |
819 | ||
820 | /* | |
821 | * If we cannot find a cookie in our cache, we suspect that this is | |
822 | * because it points to a deleted file, so we ask the server to return | |
823 | * whatever it thinks is the next entry. We then feed this to filldir. | |
824 | * If all goes well, we should then be able to find our way round the | |
825 | * cache on the next call to readdir_search_pagecache(); | |
826 | * | |
827 | * NOTE: we cannot add the anonymous page to the pagecache because | |
828 | * the data it contains might not be page aligned. Besides, | |
829 | * we should already have a complete representation of the | |
830 | * directory in the page cache by the time we get here. | |
831 | */ | |
832 | static inline | |
833 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
834 | filldir_t filldir) | |
835 | { | |
1da177e4 LT |
836 | struct page *page = NULL; |
837 | int status; | |
d1bacf9e | 838 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
0c030806 | 839 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 840 | |
1e7cb3dc CL |
841 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
842 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
843 | |
844 | page = alloc_page(GFP_HIGHUSER); | |
845 | if (!page) { | |
846 | status = -ENOMEM; | |
847 | goto out; | |
848 | } | |
d1bacf9e | 849 | |
7a8e1dc3 | 850 | desc->page_index = 0; |
0aded708 | 851 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 852 | desc->page = page; |
0c030806 | 853 | ctx->duped = 0; |
7a8e1dc3 | 854 | |
85f8607e TM |
855 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
856 | if (status < 0) | |
1da177e4 LT |
857 | goto out_release; |
858 | ||
859 | status = nfs_do_filldir(desc, dirent, filldir); | |
860 | ||
1da177e4 | 861 | out: |
1e7cb3dc | 862 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 863 | __func__, status); |
1da177e4 LT |
864 | return status; |
865 | out_release: | |
d1bacf9e | 866 | cache_page_release(desc); |
1da177e4 LT |
867 | goto out; |
868 | } | |
869 | ||
00a92642 OG |
870 | /* The file offset position represents the dirent entry number. A |
871 | last cookie cache takes care of the common case of reading the | |
872 | whole directory. | |
1da177e4 LT |
873 | */ |
874 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
875 | { | |
01cce933 | 876 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
877 | struct inode *inode = dentry->d_inode; |
878 | nfs_readdir_descriptor_t my_desc, | |
879 | *desc = &my_desc; | |
480c2006 | 880 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 881 | int res; |
1da177e4 | 882 | |
6da24bc9 | 883 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
884 | dentry->d_parent->d_name.name, dentry->d_name.name, |
885 | (long long)filp->f_pos); | |
91d5b470 CL |
886 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
887 | ||
1da177e4 | 888 | /* |
00a92642 | 889 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 890 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
891 | * to either find the entry with the appropriate number or |
892 | * revalidate the cookie. | |
1da177e4 LT |
893 | */ |
894 | memset(desc, 0, sizeof(*desc)); | |
895 | ||
896 | desc->file = filp; | |
480c2006 | 897 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 898 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
d69ee9b8 | 899 | desc->plus = nfs_use_readdirplus(inode, filp) ? 1 : 0; |
1da177e4 | 900 | |
565277f6 | 901 | nfs_block_sillyrename(dentry); |
1cda707d | 902 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
903 | if (res < 0) |
904 | goto out; | |
905 | ||
47c716cb | 906 | do { |
1da177e4 | 907 | res = readdir_search_pagecache(desc); |
00a92642 | 908 | |
1da177e4 | 909 | if (res == -EBADCOOKIE) { |
ece0b423 | 910 | res = 0; |
1da177e4 | 911 | /* This means either end of directory */ |
d1bacf9e | 912 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
913 | /* Or that the server has 'lost' a cookie */ |
914 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 915 | if (res == 0) |
1da177e4 LT |
916 | continue; |
917 | } | |
1da177e4 LT |
918 | break; |
919 | } | |
920 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 921 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 922 | nfs_zap_caches(inode); |
baf57a09 | 923 | desc->page_index = 0; |
1da177e4 | 924 | desc->plus = 0; |
d1bacf9e | 925 | desc->eof = 0; |
1da177e4 LT |
926 | continue; |
927 | } | |
928 | if (res < 0) | |
929 | break; | |
930 | ||
931 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 932 | if (res < 0) |
1da177e4 | 933 | break; |
47c716cb | 934 | } while (!desc->eof); |
fccca7fc | 935 | out: |
565277f6 | 936 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
937 | if (res > 0) |
938 | res = 0; | |
aa49b4cf | 939 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
940 | dentry->d_parent->d_name.name, dentry->d_name.name, |
941 | res); | |
942 | return res; | |
1da177e4 LT |
943 | } |
944 | ||
10afec90 | 945 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 946 | { |
b84e06c5 CL |
947 | struct dentry *dentry = filp->f_path.dentry; |
948 | struct inode *inode = dentry->d_inode; | |
480c2006 | 949 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 950 | |
6da24bc9 | 951 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
952 | dentry->d_parent->d_name.name, |
953 | dentry->d_name.name, | |
954 | offset, origin); | |
955 | ||
956 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
957 | switch (origin) { |
958 | case 1: | |
959 | offset += filp->f_pos; | |
960 | case 0: | |
961 | if (offset >= 0) | |
962 | break; | |
963 | default: | |
964 | offset = -EINVAL; | |
965 | goto out; | |
966 | } | |
967 | if (offset != filp->f_pos) { | |
968 | filp->f_pos = offset; | |
480c2006 | 969 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 970 | dir_ctx->duped = 0; |
f0dd2136 TM |
971 | } |
972 | out: | |
b84e06c5 | 973 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
974 | return offset; |
975 | } | |
976 | ||
1da177e4 LT |
977 | /* |
978 | * All directory operations under NFS are synchronous, so fsync() | |
979 | * is a dummy operation. | |
980 | */ | |
02c24a82 JB |
981 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
982 | int datasync) | |
1da177e4 | 983 | { |
7ea80859 | 984 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 985 | struct inode *inode = dentry->d_inode; |
7ea80859 | 986 | |
6da24bc9 | 987 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
988 | dentry->d_parent->d_name.name, dentry->d_name.name, |
989 | datasync); | |
990 | ||
02c24a82 | 991 | mutex_lock(&inode->i_mutex); |
54917786 | 992 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 993 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
994 | return 0; |
995 | } | |
996 | ||
bfc69a45 TM |
997 | /** |
998 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
999 | * @dir - pointer to directory inode | |
1000 | * | |
1001 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1002 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1003 | * on the server that might have invalidated our dcache. | |
1004 | * | |
1005 | * The caller should be holding dir->i_lock | |
1006 | */ | |
1007 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1008 | { | |
011935a0 | 1009 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
1010 | } |
1011 | ||
1da177e4 LT |
1012 | /* |
1013 | * A check for whether or not the parent directory has changed. | |
1014 | * In the case it has, we assume that the dentries are untrustworthy | |
1015 | * and may need to be looked up again. | |
1016 | */ | |
c79ba787 | 1017 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1018 | { |
1019 | if (IS_ROOT(dentry)) | |
1020 | return 1; | |
4eec952e TM |
1021 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1022 | return 0; | |
f2c77f4e TM |
1023 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1024 | return 0; | |
1025 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1026 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1027 | return 0; | |
1028 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
1029 | return 0; | |
1030 | return 1; | |
1da177e4 LT |
1031 | } |
1032 | ||
a12802ca TM |
1033 | /* |
1034 | * Use intent information to check whether or not we're going to do | |
1035 | * an O_EXCL create using this path component. | |
1036 | */ | |
fa3c56bb | 1037 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1038 | { |
1039 | if (NFS_PROTO(dir)->version == 2) | |
1040 | return 0; | |
fa3c56bb | 1041 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1042 | } |
1043 | ||
1d6757fb TM |
1044 | /* |
1045 | * Inode and filehandle revalidation for lookups. | |
1046 | * | |
1047 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1048 | * or if the intent information indicates that we're about to open this | |
1049 | * particular file and the "nocto" mount flag is not set. | |
1050 | * | |
1051 | */ | |
1da177e4 | 1052 | static inline |
fa3c56bb | 1053 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1054 | { |
1055 | struct nfs_server *server = NFS_SERVER(inode); | |
1056 | ||
36d43a43 | 1057 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1058 | return 0; |
facc3530 | 1059 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1060 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1061 | goto out_force; |
1062 | /* This is an open(2) */ | |
fa3c56bb AV |
1063 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1064 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 AV |
1065 | goto out_force; |
1066 | return 0; | |
1da177e4 LT |
1067 | out_force: |
1068 | return __nfs_revalidate_inode(server, inode); | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * We judge how long we want to trust negative | |
1073 | * dentries by looking at the parent inode mtime. | |
1074 | * | |
1075 | * If parent mtime has changed, we revalidate, else we wait for a | |
1076 | * period corresponding to the parent's attribute cache timeout value. | |
1077 | */ | |
1078 | static inline | |
1079 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1080 | unsigned int flags) |
1da177e4 | 1081 | { |
1da177e4 | 1082 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1083 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1084 | return 0; |
4eec952e TM |
1085 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1086 | return 1; | |
1da177e4 LT |
1087 | return !nfs_check_verifier(dir, dentry); |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * This is called every time the dcache has a lookup hit, | |
1092 | * and we should check whether we can really trust that | |
1093 | * lookup. | |
1094 | * | |
1095 | * NOTE! The hit can be a negative hit too, don't assume | |
1096 | * we have an inode! | |
1097 | * | |
1098 | * If the parent directory is seen to have changed, we throw out the | |
1099 | * cached dentry and do a new lookup. | |
1100 | */ | |
0b728e19 | 1101 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1102 | { |
1103 | struct inode *dir; | |
1104 | struct inode *inode; | |
1105 | struct dentry *parent; | |
e1fb4d05 TM |
1106 | struct nfs_fh *fhandle = NULL; |
1107 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1108 | int error; |
1da177e4 | 1109 | |
fa3c56bb | 1110 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1111 | return -ECHILD; |
1112 | ||
1da177e4 | 1113 | parent = dget_parent(dentry); |
1da177e4 | 1114 | dir = parent->d_inode; |
91d5b470 | 1115 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1116 | inode = dentry->d_inode; |
1117 | ||
1118 | if (!inode) { | |
fa3c56bb | 1119 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1120 | goto out_bad; |
d69ee9b8 | 1121 | goto out_valid_noent; |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1125 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1126 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1127 | dentry->d_name.name); |
1da177e4 LT |
1128 | goto out_bad; |
1129 | } | |
1130 | ||
15860ab1 TM |
1131 | if (nfs_have_delegation(inode, FMODE_READ)) |
1132 | goto out_set_verifier; | |
1133 | ||
1da177e4 | 1134 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1135 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1136 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1137 | goto out_zap_parent; |
1138 | goto out_valid; | |
1139 | } | |
1140 | ||
1141 | if (NFS_STALE(inode)) | |
1142 | goto out_bad; | |
1143 | ||
e1fb4d05 TM |
1144 | error = -ENOMEM; |
1145 | fhandle = nfs_alloc_fhandle(); | |
1146 | fattr = nfs_alloc_fattr(); | |
1147 | if (fhandle == NULL || fattr == NULL) | |
1148 | goto out_error; | |
1149 | ||
80a16b21 | 1150 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1151 | if (error) |
1152 | goto out_bad; | |
e1fb4d05 | 1153 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1154 | goto out_bad; |
e1fb4d05 | 1155 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1156 | goto out_bad; |
1157 | ||
e1fb4d05 TM |
1158 | nfs_free_fattr(fattr); |
1159 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1160 | out_set_verifier: |
cf8ba45e | 1161 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1162 | out_valid: |
d69ee9b8 TM |
1163 | /* Success: notify readdir to use READDIRPLUS */ |
1164 | nfs_advise_use_readdirplus(dir); | |
1165 | out_valid_noent: | |
1da177e4 | 1166 | dput(parent); |
1e7cb3dc | 1167 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1168 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1169 | dentry->d_name.name); |
1da177e4 LT |
1170 | return 1; |
1171 | out_zap_parent: | |
1172 | nfs_zap_caches(dir); | |
1173 | out_bad: | |
a1643a92 | 1174 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1175 | if (inode && S_ISDIR(inode->i_mode)) { |
1176 | /* Purge readdir caches. */ | |
1177 | nfs_zap_caches(inode); | |
1178 | /* If we have submounts, don't unhash ! */ | |
1179 | if (have_submounts(dentry)) | |
1180 | goto out_valid; | |
d9e80b7d AV |
1181 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1182 | goto out_valid; | |
1da177e4 LT |
1183 | shrink_dcache_parent(dentry); |
1184 | } | |
1185 | d_drop(dentry); | |
e1fb4d05 TM |
1186 | nfs_free_fattr(fattr); |
1187 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1188 | dput(parent); |
1e7cb3dc | 1189 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1190 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1191 | dentry->d_name.name); |
1da177e4 | 1192 | return 0; |
e1fb4d05 TM |
1193 | out_error: |
1194 | nfs_free_fattr(fattr); | |
1195 | nfs_free_fhandle(fhandle); | |
1196 | dput(parent); | |
1197 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1198 | __func__, dentry->d_parent->d_name.name, | |
1199 | dentry->d_name.name, error); | |
1200 | return error; | |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | /* | |
1204 | * This is called from dput() when d_count is going to 0. | |
1205 | */ | |
fe15ce44 | 1206 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1207 | { |
1208 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1209 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1210 | dentry->d_flags); | |
1211 | ||
77f11192 TM |
1212 | /* Unhash any dentry with a stale inode */ |
1213 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1214 | return 1; | |
1215 | ||
1da177e4 LT |
1216 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1217 | /* Unhash it, so that ->d_iput() would be called */ | |
1218 | return 1; | |
1219 | } | |
1220 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1221 | /* Unhash it, so that ancestors of killed async unlink | |
1222 | * files will be cleaned up during umount */ | |
1223 | return 1; | |
1224 | } | |
1225 | return 0; | |
1226 | ||
1227 | } | |
1228 | ||
1b83d707 TM |
1229 | static void nfs_drop_nlink(struct inode *inode) |
1230 | { | |
1231 | spin_lock(&inode->i_lock); | |
1232 | if (inode->i_nlink > 0) | |
1233 | drop_nlink(inode); | |
1234 | spin_unlock(&inode->i_lock); | |
1235 | } | |
1236 | ||
1da177e4 LT |
1237 | /* |
1238 | * Called when the dentry loses inode. | |
1239 | * We use it to clean up silly-renamed files. | |
1240 | */ | |
1241 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1242 | { | |
83672d39 NB |
1243 | if (S_ISDIR(inode->i_mode)) |
1244 | /* drop any readdir cache as it could easily be old */ | |
1245 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1246 | ||
1da177e4 | 1247 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1248 | drop_nlink(inode); |
e4eff1a6 | 1249 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1250 | } |
1da177e4 LT |
1251 | iput(inode); |
1252 | } | |
1253 | ||
b1942c5f AV |
1254 | static void nfs_d_release(struct dentry *dentry) |
1255 | { | |
1256 | /* free cached devname value, if it survived that far */ | |
1257 | if (unlikely(dentry->d_fsdata)) { | |
1258 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1259 | WARN_ON(1); | |
1260 | else | |
1261 | kfree(dentry->d_fsdata); | |
1262 | } | |
1263 | } | |
1264 | ||
f786aa90 | 1265 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1266 | .d_revalidate = nfs_lookup_revalidate, |
1267 | .d_delete = nfs_dentry_delete, | |
1268 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1269 | .d_automount = nfs_d_automount, |
b1942c5f | 1270 | .d_release = nfs_d_release, |
1da177e4 LT |
1271 | }; |
1272 | ||
00cd8dd3 | 1273 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1274 | { |
1275 | struct dentry *res; | |
565277f6 | 1276 | struct dentry *parent; |
1da177e4 | 1277 | struct inode *inode = NULL; |
e1fb4d05 TM |
1278 | struct nfs_fh *fhandle = NULL; |
1279 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1280 | int error; |
1da177e4 LT |
1281 | |
1282 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1283 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1284 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1285 | |
1286 | res = ERR_PTR(-ENAMETOOLONG); | |
1287 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1288 | goto out; | |
1289 | ||
fd684071 TM |
1290 | /* |
1291 | * If we're doing an exclusive create, optimize away the lookup | |
1292 | * but don't hash the dentry. | |
1293 | */ | |
00cd8dd3 | 1294 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1295 | d_instantiate(dentry, NULL); |
1296 | res = NULL; | |
fc0f684c | 1297 | goto out; |
fd684071 | 1298 | } |
1da177e4 | 1299 | |
e1fb4d05 TM |
1300 | res = ERR_PTR(-ENOMEM); |
1301 | fhandle = nfs_alloc_fhandle(); | |
1302 | fattr = nfs_alloc_fattr(); | |
1303 | if (fhandle == NULL || fattr == NULL) | |
1304 | goto out; | |
1305 | ||
565277f6 TM |
1306 | parent = dentry->d_parent; |
1307 | /* Protect against concurrent sillydeletes */ | |
1308 | nfs_block_sillyrename(parent); | |
80a16b21 | 1309 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1310 | if (error == -ENOENT) |
1311 | goto no_entry; | |
1312 | if (error < 0) { | |
1313 | res = ERR_PTR(error); | |
565277f6 | 1314 | goto out_unblock_sillyrename; |
1da177e4 | 1315 | } |
e1fb4d05 | 1316 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1317 | res = ERR_CAST(inode); |
03f28e3a | 1318 | if (IS_ERR(res)) |
565277f6 | 1319 | goto out_unblock_sillyrename; |
54ceac45 | 1320 | |
d69ee9b8 TM |
1321 | /* Success: notify readdir to use READDIRPLUS */ |
1322 | nfs_advise_use_readdirplus(dir); | |
1323 | ||
1da177e4 | 1324 | no_entry: |
54ceac45 | 1325 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1326 | if (res != NULL) { |
1327 | if (IS_ERR(res)) | |
565277f6 | 1328 | goto out_unblock_sillyrename; |
1da177e4 | 1329 | dentry = res; |
9eaef27b | 1330 | } |
1da177e4 | 1331 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1332 | out_unblock_sillyrename: |
1333 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1334 | out: |
e1fb4d05 TM |
1335 | nfs_free_fattr(fattr); |
1336 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1337 | return res; |
1338 | } | |
1339 | ||
1340 | #ifdef CONFIG_NFS_V4 | |
0b728e19 | 1341 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1342 | |
f786aa90 | 1343 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1344 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1345 | .d_delete = nfs_dentry_delete, |
1346 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1347 | .d_automount = nfs_d_automount, |
b1942c5f | 1348 | .d_release = nfs_d_release, |
1da177e4 LT |
1349 | }; |
1350 | ||
8a5e929d AV |
1351 | static fmode_t flags_to_mode(int flags) |
1352 | { | |
1353 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1354 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1355 | res |= FMODE_READ; | |
1356 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1357 | res |= FMODE_WRITE; | |
1358 | return res; | |
1359 | } | |
1360 | ||
51141598 | 1361 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1362 | { |
5ede7b1c | 1363 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1364 | } |
1365 | ||
1366 | static int do_open(struct inode *inode, struct file *filp) | |
1367 | { | |
1368 | nfs_fscache_set_inode_cookie(inode, filp); | |
1369 | return 0; | |
1370 | } | |
1371 | ||
d9585277 AV |
1372 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1373 | struct dentry *dentry, | |
30d90494 | 1374 | struct file *file, unsigned open_flags, |
d9585277 | 1375 | int *opened) |
cd9a1c0e | 1376 | { |
0dd2b474 MS |
1377 | int err; |
1378 | ||
1379 | if (ctx->dentry != dentry) { | |
1380 | dput(ctx->dentry); | |
1381 | ctx->dentry = dget(dentry); | |
1382 | } | |
cd9a1c0e TM |
1383 | |
1384 | /* If the open_intent is for execute, we have an extra check to make */ | |
1385 | if (ctx->mode & FMODE_EXEC) { | |
0dd2b474 | 1386 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
d9585277 | 1387 | if (err < 0) |
cd9a1c0e TM |
1388 | goto out; |
1389 | } | |
0dd2b474 | 1390 | |
30d90494 AV |
1391 | err = finish_open(file, dentry, do_open, opened); |
1392 | if (err) | |
d9585277 | 1393 | goto out; |
30d90494 | 1394 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1395 | |
cd9a1c0e TM |
1396 | out: |
1397 | put_nfs_open_context(ctx); | |
d9585277 | 1398 | return err; |
cd9a1c0e TM |
1399 | } |
1400 | ||
d9585277 | 1401 | static int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 1402 | struct file *file, unsigned open_flags, |
d9585277 | 1403 | umode_t mode, int *opened) |
1da177e4 | 1404 | { |
cd9a1c0e | 1405 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1406 | struct dentry *res; |
1407 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1408 | struct inode *inode; |
898f635c | 1409 | int err; |
1da177e4 | 1410 | |
0dd2b474 MS |
1411 | /* Expect a negative dentry */ |
1412 | BUG_ON(dentry->d_inode); | |
1413 | ||
1414 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1415 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1416 | ||
0dd2b474 MS |
1417 | /* NFS only supports OPEN on regular files */ |
1418 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1419 | if (!d_unhashed(dentry)) { |
1420 | /* | |
1421 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1422 | * revalidated and is fine, no need to perform lookup | |
1423 | * again | |
1424 | */ | |
d9585277 | 1425 | return -ENOENT; |
0dd2b474 | 1426 | } |
1da177e4 | 1427 | goto no_open; |
02a913a7 | 1428 | } |
1da177e4 | 1429 | |
0dd2b474 | 1430 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1431 | return -ENAMETOOLONG; |
cd9a1c0e | 1432 | |
0dd2b474 | 1433 | if (open_flags & O_CREAT) { |
536e43d1 | 1434 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1435 | attr.ia_mode = mode & ~current_umask(); |
1436 | } | |
536e43d1 TM |
1437 | if (open_flags & O_TRUNC) { |
1438 | attr.ia_valid |= ATTR_SIZE; | |
1439 | attr.ia_size = 0; | |
cd9a1c0e TM |
1440 | } |
1441 | ||
0dd2b474 MS |
1442 | ctx = create_nfs_open_context(dentry, open_flags); |
1443 | err = PTR_ERR(ctx); | |
1444 | if (IS_ERR(ctx)) | |
d9585277 | 1445 | goto out; |
0dd2b474 | 1446 | |
f46e0bd3 | 1447 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1448 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
0dd2b474 | 1449 | d_drop(dentry); |
f46e0bd3 TM |
1450 | if (IS_ERR(inode)) { |
1451 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1452 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1453 | err = PTR_ERR(inode); |
1454 | switch (err) { | |
1455 | case -ENOENT: | |
1456 | d_add(dentry, NULL); | |
1457 | break; | |
1458 | case -EISDIR: | |
1459 | case -ENOTDIR: | |
1460 | goto no_open; | |
1461 | case -ELOOP: | |
1462 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1463 | goto no_open; |
0dd2b474 | 1464 | break; |
1da177e4 | 1465 | /* case -EINVAL: */ |
0dd2b474 MS |
1466 | default: |
1467 | break; | |
1da177e4 | 1468 | } |
d9585277 | 1469 | goto out; |
cd9a1c0e | 1470 | } |
f46e0bd3 | 1471 | res = d_add_unique(dentry, inode); |
0dd2b474 | 1472 | if (res != NULL) |
1da177e4 | 1473 | dentry = res; |
0dd2b474 MS |
1474 | |
1475 | nfs_unblock_sillyrename(dentry->d_parent); | |
f46e0bd3 | 1476 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 | 1477 | |
30d90494 | 1478 | err = nfs_finish_open(ctx, dentry, file, open_flags, opened); |
0dd2b474 MS |
1479 | |
1480 | dput(res); | |
d9585277 AV |
1481 | out: |
1482 | return err; | |
0dd2b474 | 1483 | |
1da177e4 | 1484 | no_open: |
00cd8dd3 | 1485 | res = nfs_lookup(dir, dentry, 0); |
0dd2b474 MS |
1486 | err = PTR_ERR(res); |
1487 | if (IS_ERR(res)) | |
d9585277 | 1488 | goto out; |
0dd2b474 | 1489 | |
e45198a6 | 1490 | return finish_no_open(file, res); |
1da177e4 LT |
1491 | } |
1492 | ||
0b728e19 | 1493 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1494 | { |
1495 | struct dentry *parent = NULL; | |
657e94b6 | 1496 | struct inode *inode; |
1da177e4 | 1497 | struct inode *dir; |
50de348c | 1498 | int ret = 0; |
1da177e4 | 1499 | |
fa3c56bb | 1500 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1501 | return -ECHILD; |
1502 | ||
fa3c56bb | 1503 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1504 | goto no_open; |
1505 | if (d_mountpoint(dentry)) | |
5584c306 | 1506 | goto no_open; |
2b484297 | 1507 | |
eda72afb | 1508 | inode = dentry->d_inode; |
1da177e4 LT |
1509 | parent = dget_parent(dentry); |
1510 | dir = parent->d_inode; | |
2b484297 | 1511 | |
1da177e4 LT |
1512 | /* We can't create new files in nfs_open_revalidate(), so we |
1513 | * optimize away revalidation of negative dentries. | |
1514 | */ | |
216d5d06 | 1515 | if (inode == NULL) { |
fa3c56bb | 1516 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1517 | ret = 1; |
1da177e4 | 1518 | goto out; |
216d5d06 TM |
1519 | } |
1520 | ||
1da177e4 LT |
1521 | /* NFS only supports OPEN on regular files */ |
1522 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1523 | goto no_open_dput; |
1da177e4 | 1524 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1525 | if (flags & LOOKUP_EXCL) |
5584c306 | 1526 | goto no_open_dput; |
1da177e4 | 1527 | |
0ef97dcf MS |
1528 | /* Let f_op->open() actually open (and revalidate) the file */ |
1529 | ret = 1; | |
536e43d1 | 1530 | |
1da177e4 LT |
1531 | out: |
1532 | dput(parent); | |
1da177e4 | 1533 | return ret; |
535918f1 | 1534 | |
5584c306 | 1535 | no_open_dput: |
1da177e4 | 1536 | dput(parent); |
5584c306 | 1537 | no_open: |
0b728e19 | 1538 | return nfs_lookup_revalidate(dentry, flags); |
1da177e4 | 1539 | } |
c0204fd2 | 1540 | |
1da177e4 LT |
1541 | #endif /* CONFIG_NFSV4 */ |
1542 | ||
1da177e4 LT |
1543 | /* |
1544 | * Code common to create, mkdir, and mknod. | |
1545 | */ | |
1546 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1547 | struct nfs_fattr *fattr) | |
1548 | { | |
fab728e1 TM |
1549 | struct dentry *parent = dget_parent(dentry); |
1550 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1551 | struct inode *inode; |
1552 | int error = -EACCES; | |
1553 | ||
fab728e1 TM |
1554 | d_drop(dentry); |
1555 | ||
1da177e4 LT |
1556 | /* We may have been initialized further down */ |
1557 | if (dentry->d_inode) | |
fab728e1 | 1558 | goto out; |
1da177e4 | 1559 | if (fhandle->size == 0) { |
80a16b21 | 1560 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1561 | if (error) |
fab728e1 | 1562 | goto out_error; |
1da177e4 | 1563 | } |
5724ab37 | 1564 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1565 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1566 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1567 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1568 | if (error < 0) |
fab728e1 | 1569 | goto out_error; |
1da177e4 | 1570 | } |
1da177e4 | 1571 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1572 | error = PTR_ERR(inode); |
1573 | if (IS_ERR(inode)) | |
fab728e1 TM |
1574 | goto out_error; |
1575 | d_add(dentry, inode); | |
1576 | out: | |
1577 | dput(parent); | |
1da177e4 | 1578 | return 0; |
fab728e1 TM |
1579 | out_error: |
1580 | nfs_mark_for_revalidate(dir); | |
1581 | dput(parent); | |
1582 | return error; | |
1da177e4 LT |
1583 | } |
1584 | ||
1585 | /* | |
1586 | * Following a failed create operation, we drop the dentry rather | |
1587 | * than retain a negative dentry. This avoids a problem in the event | |
1588 | * that the operation succeeded on the server, but an error in the | |
1589 | * reply path made it appear to have failed. | |
1590 | */ | |
4acdaf27 | 1591 | static int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1592 | umode_t mode, bool excl) |
1da177e4 LT |
1593 | { |
1594 | struct iattr attr; | |
ebfc3b49 | 1595 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1596 | int error; |
1da177e4 | 1597 | |
1e7cb3dc CL |
1598 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1599 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1600 | |
1601 | attr.ia_mode = mode; | |
1602 | attr.ia_valid = ATTR_MODE; | |
1603 | ||
8867fe58 | 1604 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1605 | if (error != 0) |
1606 | goto out_err; | |
1da177e4 LT |
1607 | return 0; |
1608 | out_err: | |
1da177e4 LT |
1609 | d_drop(dentry); |
1610 | return error; | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * See comments for nfs_proc_create regarding failed operations. | |
1615 | */ | |
1616 | static int | |
1a67aafb | 1617 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1618 | { |
1619 | struct iattr attr; | |
1620 | int status; | |
1621 | ||
1e7cb3dc CL |
1622 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1623 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1624 | |
1625 | if (!new_valid_dev(rdev)) | |
1626 | return -EINVAL; | |
1627 | ||
1628 | attr.ia_mode = mode; | |
1629 | attr.ia_valid = ATTR_MODE; | |
1630 | ||
1da177e4 | 1631 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1632 | if (status != 0) |
1633 | goto out_err; | |
1da177e4 LT |
1634 | return 0; |
1635 | out_err: | |
1da177e4 LT |
1636 | d_drop(dentry); |
1637 | return status; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * See comments for nfs_proc_create regarding failed operations. | |
1642 | */ | |
18bb1db3 | 1643 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1644 | { |
1645 | struct iattr attr; | |
1646 | int error; | |
1647 | ||
1e7cb3dc CL |
1648 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1649 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1650 | |
1651 | attr.ia_valid = ATTR_MODE; | |
1652 | attr.ia_mode = mode | S_IFDIR; | |
1653 | ||
1da177e4 | 1654 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1655 | if (error != 0) |
1656 | goto out_err; | |
1da177e4 LT |
1657 | return 0; |
1658 | out_err: | |
1659 | d_drop(dentry); | |
1da177e4 LT |
1660 | return error; |
1661 | } | |
1662 | ||
d45b9d8b TM |
1663 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1664 | { | |
1665 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1666 | d_delete(dentry); | |
1667 | } | |
1668 | ||
1da177e4 LT |
1669 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1670 | { | |
1671 | int error; | |
1672 | ||
1e7cb3dc CL |
1673 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1674 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1675 | |
1da177e4 LT |
1676 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1677 | /* Ensure the VFS deletes this inode */ | |
1678 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1679 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1680 | else if (error == -ENOENT) |
1681 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1682 | |
1683 | return error; | |
1684 | } | |
1685 | ||
1da177e4 LT |
1686 | /* |
1687 | * Remove a file after making sure there are no pending writes, | |
1688 | * and after checking that the file has only one user. | |
1689 | * | |
1690 | * We invalidate the attribute cache and free the inode prior to the operation | |
1691 | * to avoid possible races if the server reuses the inode. | |
1692 | */ | |
1693 | static int nfs_safe_remove(struct dentry *dentry) | |
1694 | { | |
1695 | struct inode *dir = dentry->d_parent->d_inode; | |
1696 | struct inode *inode = dentry->d_inode; | |
1697 | int error = -EBUSY; | |
1698 | ||
1699 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1700 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1701 | ||
1702 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1703 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1704 | error = 0; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1da177e4 | 1708 | if (inode != NULL) { |
cae7a073 | 1709 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1710 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1711 | /* The VFS may want to delete this inode */ | |
1712 | if (error == 0) | |
1b83d707 | 1713 | nfs_drop_nlink(inode); |
5ba7cc48 | 1714 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1715 | } else |
1716 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1717 | if (error == -ENOENT) |
1718 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1719 | out: |
1720 | return error; | |
1721 | } | |
1722 | ||
1723 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1724 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1725 | * | |
1726 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1727 | */ | |
1728 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1729 | { | |
1730 | int error; | |
1731 | int need_rehash = 0; | |
1732 | ||
1733 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1734 | dir->i_ino, dentry->d_name.name); | |
1735 | ||
1da177e4 | 1736 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1737 | if (dentry->d_count > 1) { |
1da177e4 | 1738 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1739 | /* Start asynchronous writeout of the inode */ |
1740 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1741 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1742 | return error; |
1743 | } | |
1744 | if (!d_unhashed(dentry)) { | |
1745 | __d_drop(dentry); | |
1746 | need_rehash = 1; | |
1747 | } | |
1748 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1749 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1750 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1751 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1752 | } else if (need_rehash) | |
1753 | d_rehash(dentry); | |
1da177e4 LT |
1754 | return error; |
1755 | } | |
1756 | ||
873101b3 CL |
1757 | /* |
1758 | * To create a symbolic link, most file systems instantiate a new inode, | |
1759 | * add a page to it containing the path, then write it out to the disk | |
1760 | * using prepare_write/commit_write. | |
1761 | * | |
1762 | * Unfortunately the NFS client can't create the in-core inode first | |
1763 | * because it needs a file handle to create an in-core inode (see | |
1764 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1765 | * symlink request has completed on the server. | |
1766 | * | |
1767 | * So instead we allocate a raw page, copy the symname into it, then do | |
1768 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1769 | * now have a new file handle and can instantiate an in-core NFS inode | |
1770 | * and move the raw page into its mapping. | |
1771 | */ | |
1772 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1773 | { |
873101b3 CL |
1774 | struct pagevec lru_pvec; |
1775 | struct page *page; | |
1776 | char *kaddr; | |
1da177e4 | 1777 | struct iattr attr; |
873101b3 | 1778 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1779 | int error; |
1780 | ||
1781 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1782 | dir->i_ino, dentry->d_name.name, symname); | |
1783 | ||
873101b3 CL |
1784 | if (pathlen > PAGE_SIZE) |
1785 | return -ENAMETOOLONG; | |
1da177e4 | 1786 | |
873101b3 CL |
1787 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1788 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1789 | |
83d93f22 | 1790 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1791 | if (!page) |
873101b3 | 1792 | return -ENOMEM; |
873101b3 | 1793 | |
2b86ce2d | 1794 | kaddr = kmap_atomic(page); |
873101b3 CL |
1795 | memcpy(kaddr, symname, pathlen); |
1796 | if (pathlen < PAGE_SIZE) | |
1797 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1798 | kunmap_atomic(kaddr); |
873101b3 | 1799 | |
94a6d753 | 1800 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1801 | if (error != 0) { |
1802 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1803 | dir->i_sb->s_id, dir->i_ino, | |
1804 | dentry->d_name.name, symname, error); | |
1da177e4 | 1805 | d_drop(dentry); |
873101b3 | 1806 | __free_page(page); |
873101b3 CL |
1807 | return error; |
1808 | } | |
1809 | ||
1810 | /* | |
1811 | * No big deal if we can't add this page to the page cache here. | |
1812 | * READLINK will get the missing page from the server if needed. | |
1813 | */ | |
1814 | pagevec_init(&lru_pvec, 0); | |
1815 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1816 | GFP_KERNEL)) { | |
39cf8a13 | 1817 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1818 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1819 | SetPageUptodate(page); |
1820 | unlock_page(page); | |
1821 | } else | |
1822 | __free_page(page); | |
1823 | ||
873101b3 | 1824 | return 0; |
1da177e4 LT |
1825 | } |
1826 | ||
1827 | static int | |
1828 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1829 | { | |
1830 | struct inode *inode = old_dentry->d_inode; | |
1831 | int error; | |
1832 | ||
1833 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1834 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1835 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1836 | ||
9a3936aa TM |
1837 | nfs_inode_return_delegation(inode); |
1838 | ||
9697d234 | 1839 | d_drop(dentry); |
1da177e4 | 1840 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1841 | if (error == 0) { |
7de9c6ee | 1842 | ihold(inode); |
9697d234 | 1843 | d_add(dentry, inode); |
cf809556 | 1844 | } |
1da177e4 LT |
1845 | return error; |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * RENAME | |
1850 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1851 | * different file handle for the same inode after a rename (e.g. when | |
1852 | * moving to a different directory). A fail-safe method to do so would | |
1853 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1854 | * rename the old file using the sillyrename stuff. This way, the original | |
1855 | * file in old_dir will go away when the last process iput()s the inode. | |
1856 | * | |
1857 | * FIXED. | |
1858 | * | |
1859 | * It actually works quite well. One needs to have the possibility for | |
1860 | * at least one ".nfs..." file in each directory the file ever gets | |
1861 | * moved or linked to which happens automagically with the new | |
1862 | * implementation that only depends on the dcache stuff instead of | |
1863 | * using the inode layer | |
1864 | * | |
1865 | * Unfortunately, things are a little more complicated than indicated | |
1866 | * above. For a cross-directory move, we want to make sure we can get | |
1867 | * rid of the old inode after the operation. This means there must be | |
1868 | * no pending writes (if it's a file), and the use count must be 1. | |
1869 | * If these conditions are met, we can drop the dentries before doing | |
1870 | * the rename. | |
1871 | */ | |
1872 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1873 | struct inode *new_dir, struct dentry *new_dentry) | |
1874 | { | |
1875 | struct inode *old_inode = old_dentry->d_inode; | |
1876 | struct inode *new_inode = new_dentry->d_inode; | |
1877 | struct dentry *dentry = NULL, *rehash = NULL; | |
1878 | int error = -EBUSY; | |
1879 | ||
1da177e4 LT |
1880 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1881 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1882 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1883 | new_dentry->d_count); |
1da177e4 LT |
1884 | |
1885 | /* | |
28f79a1a MS |
1886 | * For non-directories, check whether the target is busy and if so, |
1887 | * make a copy of the dentry and then do a silly-rename. If the | |
1888 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1889 | * the new target. | |
1da177e4 | 1890 | */ |
27226104 MS |
1891 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1892 | /* | |
1893 | * To prevent any new references to the target during the | |
1894 | * rename, we unhash the dentry in advance. | |
1895 | */ | |
1896 | if (!d_unhashed(new_dentry)) { | |
1897 | d_drop(new_dentry); | |
1898 | rehash = new_dentry; | |
1899 | } | |
1da177e4 | 1900 | |
b7ab39f6 | 1901 | if (new_dentry->d_count > 2) { |
27226104 MS |
1902 | int err; |
1903 | ||
1904 | /* copy the target dentry's name */ | |
1905 | dentry = d_alloc(new_dentry->d_parent, | |
1906 | &new_dentry->d_name); | |
1907 | if (!dentry) | |
1908 | goto out; | |
1909 | ||
1910 | /* silly-rename the existing target ... */ | |
1911 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1912 | if (err) |
27226104 | 1913 | goto out; |
24e93025 MS |
1914 | |
1915 | new_dentry = dentry; | |
56335936 | 1916 | rehash = NULL; |
24e93025 | 1917 | new_inode = NULL; |
27226104 | 1918 | } |
b1e4adf4 | 1919 | } |
1da177e4 | 1920 | |
cae7a073 | 1921 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1922 | if (new_inode != NULL) |
24174119 | 1923 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1924 | |
1da177e4 LT |
1925 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1926 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1927 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1928 | out: |
1929 | if (rehash) | |
1930 | d_rehash(rehash); | |
1931 | if (!error) { | |
b1e4adf4 TM |
1932 | if (new_inode != NULL) |
1933 | nfs_drop_nlink(new_inode); | |
349457cc | 1934 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1935 | nfs_set_verifier(new_dentry, |
1936 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1937 | } else if (error == -ENOENT) |
1938 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1939 | |
1940 | /* new dentry created? */ | |
1941 | if (dentry) | |
1942 | dput(dentry); | |
1da177e4 LT |
1943 | return error; |
1944 | } | |
1945 | ||
cfcea3e8 TM |
1946 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1947 | static LIST_HEAD(nfs_access_lru_list); | |
1948 | static atomic_long_t nfs_access_nr_entries; | |
1949 | ||
1c3c07e9 TM |
1950 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1951 | { | |
1952 | put_rpccred(entry->cred); | |
1953 | kfree(entry); | |
cfcea3e8 TM |
1954 | smp_mb__before_atomic_dec(); |
1955 | atomic_long_dec(&nfs_access_nr_entries); | |
1956 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1957 | } |
1958 | ||
1a81bb8a TM |
1959 | static void nfs_access_free_list(struct list_head *head) |
1960 | { | |
1961 | struct nfs_access_entry *cache; | |
1962 | ||
1963 | while (!list_empty(head)) { | |
1964 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1965 | list_del(&cache->lru); | |
1966 | nfs_access_free_entry(cache); | |
1967 | } | |
1968 | } | |
1969 | ||
1495f230 YH |
1970 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
1971 | struct shrink_control *sc) | |
979df72e TM |
1972 | { |
1973 | LIST_HEAD(head); | |
aa510da5 | 1974 | struct nfs_inode *nfsi, *next; |
979df72e | 1975 | struct nfs_access_entry *cache; |
1495f230 YH |
1976 | int nr_to_scan = sc->nr_to_scan; |
1977 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 1978 | |
61d5eb29 TM |
1979 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1980 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1981 | |
a50f7951 | 1982 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1983 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1984 | struct inode *inode; |
1985 | ||
1986 | if (nr_to_scan-- == 0) | |
1987 | break; | |
9c7e7e23 | 1988 | inode = &nfsi->vfs_inode; |
979df72e TM |
1989 | spin_lock(&inode->i_lock); |
1990 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1991 | goto remove_lru_entry; | |
1992 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1993 | struct nfs_access_entry, lru); | |
1994 | list_move(&cache->lru, &head); | |
1995 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1996 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1997 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1998 | &nfs_access_lru_list); | |
1999 | else { | |
2000 | remove_lru_entry: | |
2001 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2002 | smp_mb__before_clear_bit(); |
979df72e | 2003 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2004 | smp_mb__after_clear_bit(); |
979df72e | 2005 | } |
59844a9b | 2006 | spin_unlock(&inode->i_lock); |
979df72e TM |
2007 | } |
2008 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2009 | nfs_access_free_list(&head); |
979df72e TM |
2010 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2011 | } | |
2012 | ||
1a81bb8a | 2013 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2014 | { |
1c3c07e9 | 2015 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2016 | struct rb_node *n; |
1c3c07e9 TM |
2017 | struct nfs_access_entry *entry; |
2018 | ||
2019 | /* Unhook entries from the cache */ | |
2020 | while ((n = rb_first(root_node)) != NULL) { | |
2021 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2022 | rb_erase(n, root_node); | |
1a81bb8a | 2023 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2024 | } |
2025 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2026 | } |
2027 | ||
1c3c07e9 | 2028 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2029 | { |
1a81bb8a TM |
2030 | LIST_HEAD(head); |
2031 | ||
2032 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2033 | return; | |
cfcea3e8 | 2034 | /* Remove from global LRU init */ |
1a81bb8a TM |
2035 | spin_lock(&nfs_access_lru_lock); |
2036 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2037 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2038 | |
1c3c07e9 | 2039 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2040 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2041 | spin_unlock(&inode->i_lock); | |
2042 | spin_unlock(&nfs_access_lru_lock); | |
2043 | nfs_access_free_list(&head); | |
1c3c07e9 | 2044 | } |
1da177e4 | 2045 | |
1c3c07e9 TM |
2046 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2047 | { | |
2048 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2049 | struct nfs_access_entry *entry; | |
2050 | ||
2051 | while (n != NULL) { | |
2052 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2053 | ||
2054 | if (cred < entry->cred) | |
2055 | n = n->rb_left; | |
2056 | else if (cred > entry->cred) | |
2057 | n = n->rb_right; | |
2058 | else | |
2059 | return entry; | |
1da177e4 | 2060 | } |
1c3c07e9 TM |
2061 | return NULL; |
2062 | } | |
2063 | ||
af22f94a | 2064 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2065 | { |
2066 | struct nfs_inode *nfsi = NFS_I(inode); | |
2067 | struct nfs_access_entry *cache; | |
2068 | int err = -ENOENT; | |
2069 | ||
dc59250c | 2070 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2071 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2072 | goto out_zap; | |
2073 | cache = nfs_access_search_rbtree(inode, cred); | |
2074 | if (cache == NULL) | |
2075 | goto out; | |
b4d2314b | 2076 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2077 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2078 | goto out_stale; |
2079 | res->jiffies = cache->jiffies; | |
2080 | res->cred = cache->cred; | |
2081 | res->mask = cache->mask; | |
cfcea3e8 | 2082 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2083 | err = 0; |
2084 | out: | |
2085 | spin_unlock(&inode->i_lock); | |
2086 | return err; | |
2087 | out_stale: | |
2088 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2089 | list_del(&cache->lru); |
1c3c07e9 TM |
2090 | spin_unlock(&inode->i_lock); |
2091 | nfs_access_free_entry(cache); | |
2092 | return -ENOENT; | |
2093 | out_zap: | |
1a81bb8a TM |
2094 | spin_unlock(&inode->i_lock); |
2095 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2096 | return -ENOENT; |
2097 | } | |
2098 | ||
2099 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2100 | { | |
cfcea3e8 TM |
2101 | struct nfs_inode *nfsi = NFS_I(inode); |
2102 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2103 | struct rb_node **p = &root_node->rb_node; |
2104 | struct rb_node *parent = NULL; | |
2105 | struct nfs_access_entry *entry; | |
2106 | ||
2107 | spin_lock(&inode->i_lock); | |
2108 | while (*p != NULL) { | |
2109 | parent = *p; | |
2110 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2111 | ||
2112 | if (set->cred < entry->cred) | |
2113 | p = &parent->rb_left; | |
2114 | else if (set->cred > entry->cred) | |
2115 | p = &parent->rb_right; | |
2116 | else | |
2117 | goto found; | |
2118 | } | |
2119 | rb_link_node(&set->rb_node, parent, p); | |
2120 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2121 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2122 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2123 | return; |
2124 | found: | |
2125 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2126 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2127 | list_del(&entry->lru); | |
1c3c07e9 TM |
2128 | spin_unlock(&inode->i_lock); |
2129 | nfs_access_free_entry(entry); | |
2130 | } | |
2131 | ||
af22f94a | 2132 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2133 | { |
2134 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2135 | if (cache == NULL) | |
2136 | return; | |
2137 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2138 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2139 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2140 | cache->mask = set->mask; |
1c3c07e9 TM |
2141 | |
2142 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2143 | |
2144 | /* Update accounting */ | |
2145 | smp_mb__before_atomic_inc(); | |
2146 | atomic_long_inc(&nfs_access_nr_entries); | |
2147 | smp_mb__after_atomic_inc(); | |
2148 | ||
2149 | /* Add inode to global LRU list */ | |
1a81bb8a | 2150 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2151 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2152 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2153 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2154 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2155 | spin_unlock(&nfs_access_lru_lock); |
2156 | } | |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2160 | { | |
2161 | struct nfs_access_entry cache; | |
2162 | int status; | |
2163 | ||
2164 | status = nfs_access_get_cached(inode, cred, &cache); | |
2165 | if (status == 0) | |
2166 | goto out; | |
2167 | ||
2168 | /* Be clever: ask server to check for all possible rights */ | |
2169 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2170 | cache.cred = cred; | |
2171 | cache.jiffies = jiffies; | |
2172 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2173 | if (status != 0) { |
2174 | if (status == -ESTALE) { | |
2175 | nfs_zap_caches(inode); | |
2176 | if (!S_ISDIR(inode->i_mode)) | |
2177 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2178 | } | |
1da177e4 | 2179 | return status; |
a71ee337 | 2180 | } |
1da177e4 LT |
2181 | nfs_access_add_cache(inode, &cache); |
2182 | out: | |
e6305c43 | 2183 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2184 | return 0; |
2185 | return -EACCES; | |
2186 | } | |
2187 | ||
af22f94a TM |
2188 | static int nfs_open_permission_mask(int openflags) |
2189 | { | |
2190 | int mask = 0; | |
2191 | ||
8a5e929d | 2192 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2193 | mask |= MAY_READ; |
8a5e929d | 2194 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2195 | mask |= MAY_WRITE; |
8a5e929d | 2196 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2197 | mask |= MAY_EXEC; |
2198 | return mask; | |
2199 | } | |
2200 | ||
2201 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2202 | { | |
2203 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2204 | } | |
2205 | ||
10556cb2 | 2206 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2207 | { |
2208 | struct rpc_cred *cred; | |
2209 | int res = 0; | |
2210 | ||
10556cb2 | 2211 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2212 | return -ECHILD; |
2213 | ||
91d5b470 CL |
2214 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2215 | ||
e6305c43 | 2216 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2217 | goto out; |
2218 | /* Is this sys_access() ? */ | |
9cfcac81 | 2219 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2220 | goto force_lookup; |
2221 | ||
2222 | switch (inode->i_mode & S_IFMT) { | |
2223 | case S_IFLNK: | |
2224 | goto out; | |
2225 | case S_IFREG: | |
2226 | /* NFSv4 has atomic_open... */ | |
2227 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2228 | && (mask & MAY_OPEN) |
2229 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2230 | goto out; |
2231 | break; | |
2232 | case S_IFDIR: | |
2233 | /* | |
2234 | * Optimize away all write operations, since the server | |
2235 | * will check permissions when we perform the op. | |
2236 | */ | |
2237 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2238 | goto out; | |
2239 | } | |
2240 | ||
2241 | force_lookup: | |
1da177e4 LT |
2242 | if (!NFS_PROTO(inode)->access) |
2243 | goto out_notsup; | |
2244 | ||
98a8e323 | 2245 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2246 | if (!IS_ERR(cred)) { |
2247 | res = nfs_do_access(inode, cred, mask); | |
2248 | put_rpccred(cred); | |
2249 | } else | |
2250 | res = PTR_ERR(cred); | |
1da177e4 | 2251 | out: |
f696a365 MS |
2252 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2253 | res = -EACCES; | |
2254 | ||
1e7cb3dc CL |
2255 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2256 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2257 | return res; |
2258 | out_notsup: | |
2259 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2260 | if (res == 0) | |
2830ba7f | 2261 | res = generic_permission(inode, mask); |
1e7cb3dc | 2262 | goto out; |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | /* | |
2266 | * Local variables: | |
2267 | * version-control: t | |
2268 | * kept-new-versions: 5 | |
2269 | * End: | |
2270 | */ |