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 LT |
48 | static int nfs_readdir(struct file *, void *, filldir_t); |
49 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
4acdaf27 | 50 | static int nfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *); |
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 | ||
0dd2b474 MS |
114 | static struct file *nfs_atomic_open(struct inode *, struct dentry *, |
115 | struct opendata *, unsigned, umode_t, | |
116 | bool *); | |
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 | ||
1d6757fb TM |
1033 | /* |
1034 | * Return the intent data that applies to this particular path component | |
1035 | * | |
1036 | * Note that the current set of intents only apply to the very last | |
8aeb376c AV |
1037 | * component of the path and none of them is set before that last |
1038 | * component. | |
1d6757fb | 1039 | */ |
34286d66 NP |
1040 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, |
1041 | unsigned int mask) | |
1d6757fb | 1042 | { |
1d6757fb TM |
1043 | return nd->flags & mask; |
1044 | } | |
1045 | ||
a12802ca TM |
1046 | /* |
1047 | * Use intent information to check whether or not we're going to do | |
1048 | * an O_EXCL create using this path component. | |
1049 | */ | |
1050 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
1051 | { | |
1052 | if (NFS_PROTO(dir)->version == 2) | |
1053 | return 0; | |
3516586a | 1054 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
1055 | } |
1056 | ||
1d6757fb TM |
1057 | /* |
1058 | * Inode and filehandle revalidation for lookups. | |
1059 | * | |
1060 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1061 | * or if the intent information indicates that we're about to open this | |
1062 | * particular file and the "nocto" mount flag is not set. | |
1063 | * | |
1064 | */ | |
1da177e4 LT |
1065 | static inline |
1066 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
1067 | { | |
1068 | struct nfs_server *server = NFS_SERVER(inode); | |
1069 | ||
36d43a43 | 1070 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1071 | return 0; |
1da177e4 | 1072 | if (nd != NULL) { |
1da177e4 | 1073 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 1074 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
1075 | goto out_force; |
1076 | /* This is an open(2) */ | |
1d6757fb | 1077 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
1078 | !(server->flags & NFS_MOUNT_NOCTO) && |
1079 | (S_ISREG(inode->i_mode) || | |
1080 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 1081 | goto out_force; |
4f48af45 | 1082 | return 0; |
1da177e4 LT |
1083 | } |
1084 | return nfs_revalidate_inode(server, inode); | |
1085 | out_force: | |
1086 | return __nfs_revalidate_inode(server, inode); | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * We judge how long we want to trust negative | |
1091 | * dentries by looking at the parent inode mtime. | |
1092 | * | |
1093 | * If parent mtime has changed, we revalidate, else we wait for a | |
1094 | * period corresponding to the parent's attribute cache timeout value. | |
1095 | */ | |
1096 | static inline | |
1097 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
1098 | struct nameidata *nd) | |
1099 | { | |
1da177e4 | 1100 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 1101 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1102 | return 0; |
4eec952e TM |
1103 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1104 | return 1; | |
1da177e4 LT |
1105 | return !nfs_check_verifier(dir, dentry); |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * This is called every time the dcache has a lookup hit, | |
1110 | * and we should check whether we can really trust that | |
1111 | * lookup. | |
1112 | * | |
1113 | * NOTE! The hit can be a negative hit too, don't assume | |
1114 | * we have an inode! | |
1115 | * | |
1116 | * If the parent directory is seen to have changed, we throw out the | |
1117 | * cached dentry and do a new lookup. | |
1118 | */ | |
34286d66 | 1119 | static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1120 | { |
1121 | struct inode *dir; | |
1122 | struct inode *inode; | |
1123 | struct dentry *parent; | |
e1fb4d05 TM |
1124 | struct nfs_fh *fhandle = NULL; |
1125 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1126 | int error; |
1da177e4 | 1127 | |
34286d66 NP |
1128 | if (nd->flags & LOOKUP_RCU) |
1129 | return -ECHILD; | |
1130 | ||
1da177e4 | 1131 | parent = dget_parent(dentry); |
1da177e4 | 1132 | dir = parent->d_inode; |
91d5b470 | 1133 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1134 | inode = dentry->d_inode; |
1135 | ||
1136 | if (!inode) { | |
1137 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1138 | goto out_bad; | |
d69ee9b8 | 1139 | goto out_valid_noent; |
1da177e4 LT |
1140 | } |
1141 | ||
1142 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1143 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1144 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1145 | dentry->d_name.name); |
1da177e4 LT |
1146 | goto out_bad; |
1147 | } | |
1148 | ||
15860ab1 TM |
1149 | if (nfs_have_delegation(inode, FMODE_READ)) |
1150 | goto out_set_verifier; | |
1151 | ||
1da177e4 | 1152 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1153 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1154 | if (nfs_lookup_verify_inode(inode, nd)) |
1155 | goto out_zap_parent; | |
1156 | goto out_valid; | |
1157 | } | |
1158 | ||
1159 | if (NFS_STALE(inode)) | |
1160 | goto out_bad; | |
1161 | ||
e1fb4d05 TM |
1162 | error = -ENOMEM; |
1163 | fhandle = nfs_alloc_fhandle(); | |
1164 | fattr = nfs_alloc_fattr(); | |
1165 | if (fhandle == NULL || fattr == NULL) | |
1166 | goto out_error; | |
1167 | ||
80a16b21 | 1168 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1169 | if (error) |
1170 | goto out_bad; | |
e1fb4d05 | 1171 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1172 | goto out_bad; |
e1fb4d05 | 1173 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1174 | goto out_bad; |
1175 | ||
e1fb4d05 TM |
1176 | nfs_free_fattr(fattr); |
1177 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1178 | out_set_verifier: |
cf8ba45e | 1179 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1180 | out_valid: |
d69ee9b8 TM |
1181 | /* Success: notify readdir to use READDIRPLUS */ |
1182 | nfs_advise_use_readdirplus(dir); | |
1183 | out_valid_noent: | |
1da177e4 | 1184 | dput(parent); |
1e7cb3dc | 1185 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1186 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1187 | dentry->d_name.name); |
1da177e4 LT |
1188 | return 1; |
1189 | out_zap_parent: | |
1190 | nfs_zap_caches(dir); | |
1191 | out_bad: | |
a1643a92 | 1192 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1193 | if (inode && S_ISDIR(inode->i_mode)) { |
1194 | /* Purge readdir caches. */ | |
1195 | nfs_zap_caches(inode); | |
1196 | /* If we have submounts, don't unhash ! */ | |
1197 | if (have_submounts(dentry)) | |
1198 | goto out_valid; | |
d9e80b7d AV |
1199 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1200 | goto out_valid; | |
1da177e4 LT |
1201 | shrink_dcache_parent(dentry); |
1202 | } | |
1203 | d_drop(dentry); | |
e1fb4d05 TM |
1204 | nfs_free_fattr(fattr); |
1205 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1206 | dput(parent); |
1e7cb3dc | 1207 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1208 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1209 | dentry->d_name.name); |
1da177e4 | 1210 | return 0; |
e1fb4d05 TM |
1211 | out_error: |
1212 | nfs_free_fattr(fattr); | |
1213 | nfs_free_fhandle(fhandle); | |
1214 | dput(parent); | |
1215 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1216 | __func__, dentry->d_parent->d_name.name, | |
1217 | dentry->d_name.name, error); | |
1218 | return error; | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * This is called from dput() when d_count is going to 0. | |
1223 | */ | |
fe15ce44 | 1224 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1225 | { |
1226 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1227 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1228 | dentry->d_flags); | |
1229 | ||
77f11192 TM |
1230 | /* Unhash any dentry with a stale inode */ |
1231 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1232 | return 1; | |
1233 | ||
1da177e4 LT |
1234 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1235 | /* Unhash it, so that ->d_iput() would be called */ | |
1236 | return 1; | |
1237 | } | |
1238 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1239 | /* Unhash it, so that ancestors of killed async unlink | |
1240 | * files will be cleaned up during umount */ | |
1241 | return 1; | |
1242 | } | |
1243 | return 0; | |
1244 | ||
1245 | } | |
1246 | ||
1b83d707 TM |
1247 | static void nfs_drop_nlink(struct inode *inode) |
1248 | { | |
1249 | spin_lock(&inode->i_lock); | |
1250 | if (inode->i_nlink > 0) | |
1251 | drop_nlink(inode); | |
1252 | spin_unlock(&inode->i_lock); | |
1253 | } | |
1254 | ||
1da177e4 LT |
1255 | /* |
1256 | * Called when the dentry loses inode. | |
1257 | * We use it to clean up silly-renamed files. | |
1258 | */ | |
1259 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1260 | { | |
83672d39 NB |
1261 | if (S_ISDIR(inode->i_mode)) |
1262 | /* drop any readdir cache as it could easily be old */ | |
1263 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1264 | ||
1da177e4 | 1265 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1266 | drop_nlink(inode); |
e4eff1a6 | 1267 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1268 | } |
1da177e4 LT |
1269 | iput(inode); |
1270 | } | |
1271 | ||
b1942c5f AV |
1272 | static void nfs_d_release(struct dentry *dentry) |
1273 | { | |
1274 | /* free cached devname value, if it survived that far */ | |
1275 | if (unlikely(dentry->d_fsdata)) { | |
1276 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1277 | WARN_ON(1); | |
1278 | else | |
1279 | kfree(dentry->d_fsdata); | |
1280 | } | |
1281 | } | |
1282 | ||
f786aa90 | 1283 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1284 | .d_revalidate = nfs_lookup_revalidate, |
1285 | .d_delete = nfs_dentry_delete, | |
1286 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1287 | .d_automount = nfs_d_automount, |
b1942c5f | 1288 | .d_release = nfs_d_release, |
1da177e4 LT |
1289 | }; |
1290 | ||
1da177e4 LT |
1291 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1292 | { | |
1293 | struct dentry *res; | |
565277f6 | 1294 | struct dentry *parent; |
1da177e4 | 1295 | struct inode *inode = NULL; |
e1fb4d05 TM |
1296 | struct nfs_fh *fhandle = NULL; |
1297 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1298 | int error; |
1da177e4 LT |
1299 | |
1300 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1301 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1302 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1303 | |
1304 | res = ERR_PTR(-ENAMETOOLONG); | |
1305 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1306 | goto out; | |
1307 | ||
fd684071 TM |
1308 | /* |
1309 | * If we're doing an exclusive create, optimize away the lookup | |
1310 | * but don't hash the dentry. | |
1311 | */ | |
1312 | if (nfs_is_exclusive_create(dir, nd)) { | |
1313 | d_instantiate(dentry, NULL); | |
1314 | res = NULL; | |
fc0f684c | 1315 | goto out; |
fd684071 | 1316 | } |
1da177e4 | 1317 | |
e1fb4d05 TM |
1318 | res = ERR_PTR(-ENOMEM); |
1319 | fhandle = nfs_alloc_fhandle(); | |
1320 | fattr = nfs_alloc_fattr(); | |
1321 | if (fhandle == NULL || fattr == NULL) | |
1322 | goto out; | |
1323 | ||
565277f6 TM |
1324 | parent = dentry->d_parent; |
1325 | /* Protect against concurrent sillydeletes */ | |
1326 | nfs_block_sillyrename(parent); | |
80a16b21 | 1327 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1328 | if (error == -ENOENT) |
1329 | goto no_entry; | |
1330 | if (error < 0) { | |
1331 | res = ERR_PTR(error); | |
565277f6 | 1332 | goto out_unblock_sillyrename; |
1da177e4 | 1333 | } |
e1fb4d05 | 1334 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1335 | res = ERR_CAST(inode); |
03f28e3a | 1336 | if (IS_ERR(res)) |
565277f6 | 1337 | goto out_unblock_sillyrename; |
54ceac45 | 1338 | |
d69ee9b8 TM |
1339 | /* Success: notify readdir to use READDIRPLUS */ |
1340 | nfs_advise_use_readdirplus(dir); | |
1341 | ||
1da177e4 | 1342 | no_entry: |
54ceac45 | 1343 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1344 | if (res != NULL) { |
1345 | if (IS_ERR(res)) | |
565277f6 | 1346 | goto out_unblock_sillyrename; |
1da177e4 | 1347 | dentry = res; |
9eaef27b | 1348 | } |
1da177e4 | 1349 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1350 | out_unblock_sillyrename: |
1351 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1352 | out: |
e1fb4d05 TM |
1353 | nfs_free_fattr(fattr); |
1354 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1355 | return res; |
1356 | } | |
1357 | ||
1358 | #ifdef CONFIG_NFS_V4 | |
0ef97dcf | 1359 | static int nfs4_lookup_revalidate(struct dentry *, struct nameidata *); |
1da177e4 | 1360 | |
f786aa90 | 1361 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1362 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1363 | .d_delete = nfs_dentry_delete, |
1364 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1365 | .d_automount = nfs_d_automount, |
b1942c5f | 1366 | .d_release = nfs_d_release, |
1da177e4 LT |
1367 | }; |
1368 | ||
1d6757fb TM |
1369 | /* |
1370 | * Use intent information to determine whether we need to substitute | |
1371 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1372 | */ | |
5584c306 | 1373 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1374 | { |
1d6757fb | 1375 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1376 | return 0; |
1377 | /* NFS does not (yet) have a stateful open for directories */ | |
1378 | if (nd->flags & LOOKUP_DIRECTORY) | |
1379 | return 0; | |
1380 | /* Are we trying to write to a read only partition? */ | |
2c463e95 | 1381 | if (__mnt_is_readonly(nd->path.mnt) && |
8a5e929d | 1382 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|O_ACCMODE))) |
1da177e4 LT |
1383 | return 0; |
1384 | return 1; | |
1385 | } | |
1386 | ||
8a5e929d AV |
1387 | static fmode_t flags_to_mode(int flags) |
1388 | { | |
1389 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1390 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1391 | res |= FMODE_READ; | |
1392 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1393 | res |= FMODE_WRITE; | |
1394 | return res; | |
1395 | } | |
1396 | ||
51141598 | 1397 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1398 | { |
5ede7b1c | 1399 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1400 | } |
1401 | ||
1402 | static int do_open(struct inode *inode, struct file *filp) | |
1403 | { | |
1404 | nfs_fscache_set_inode_cookie(inode, filp); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
0dd2b474 MS |
1408 | static struct file *nfs_finish_open(struct nfs_open_context *ctx, |
1409 | struct dentry *dentry, | |
1410 | struct opendata *od, unsigned open_flags) | |
cd9a1c0e TM |
1411 | { |
1412 | struct file *filp; | |
0dd2b474 MS |
1413 | int err; |
1414 | ||
1415 | if (ctx->dentry != dentry) { | |
1416 | dput(ctx->dentry); | |
1417 | ctx->dentry = dget(dentry); | |
1418 | } | |
cd9a1c0e TM |
1419 | |
1420 | /* If the open_intent is for execute, we have an extra check to make */ | |
1421 | if (ctx->mode & FMODE_EXEC) { | |
0dd2b474 MS |
1422 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
1423 | if (err < 0) { | |
1424 | filp = ERR_PTR(err); | |
cd9a1c0e | 1425 | goto out; |
0dd2b474 | 1426 | } |
cd9a1c0e | 1427 | } |
0dd2b474 MS |
1428 | |
1429 | filp = finish_open(od, dentry, do_open); | |
1430 | if (!IS_ERR(filp)) | |
cd9a1c0e | 1431 | nfs_file_set_open_context(filp, ctx); |
0dd2b474 | 1432 | |
cd9a1c0e TM |
1433 | out: |
1434 | put_nfs_open_context(ctx); | |
0dd2b474 | 1435 | return filp; |
cd9a1c0e TM |
1436 | } |
1437 | ||
0dd2b474 MS |
1438 | static struct file *nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1439 | struct opendata *od, unsigned open_flags, | |
1440 | umode_t mode, bool *created) | |
1da177e4 | 1441 | { |
cd9a1c0e | 1442 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1443 | struct dentry *res; |
1444 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1445 | struct inode *inode; |
0dd2b474 | 1446 | struct file *filp; |
898f635c | 1447 | int err; |
1da177e4 | 1448 | |
0dd2b474 MS |
1449 | /* Expect a negative dentry */ |
1450 | BUG_ON(dentry->d_inode); | |
1451 | ||
1452 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1453 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1454 | ||
0dd2b474 MS |
1455 | /* NFS only supports OPEN on regular files */ |
1456 | if ((open_flags & O_DIRECTORY)) { | |
1457 | err = -ENOENT; | |
1458 | if (!d_unhashed(dentry)) { | |
1459 | /* | |
1460 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1461 | * revalidated and is fine, no need to perform lookup | |
1462 | * again | |
1463 | */ | |
1464 | goto out_err; | |
1465 | } | |
1da177e4 | 1466 | goto no_open; |
02a913a7 | 1467 | } |
1da177e4 | 1468 | |
0dd2b474 MS |
1469 | err = -ENAMETOOLONG; |
1470 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1471 | goto out_err; | |
cd9a1c0e | 1472 | |
0dd2b474 | 1473 | if (open_flags & O_CREAT) { |
536e43d1 | 1474 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1475 | attr.ia_mode = mode & ~current_umask(); |
1476 | } | |
536e43d1 TM |
1477 | if (open_flags & O_TRUNC) { |
1478 | attr.ia_valid |= ATTR_SIZE; | |
1479 | attr.ia_size = 0; | |
cd9a1c0e TM |
1480 | } |
1481 | ||
0dd2b474 MS |
1482 | ctx = create_nfs_open_context(dentry, open_flags); |
1483 | err = PTR_ERR(ctx); | |
1484 | if (IS_ERR(ctx)) | |
1485 | goto out_err; | |
1486 | ||
f46e0bd3 | 1487 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1488 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
0dd2b474 | 1489 | d_drop(dentry); |
f46e0bd3 TM |
1490 | if (IS_ERR(inode)) { |
1491 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1492 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1493 | err = PTR_ERR(inode); |
1494 | switch (err) { | |
1495 | case -ENOENT: | |
1496 | d_add(dentry, NULL); | |
1497 | break; | |
1498 | case -EISDIR: | |
1499 | case -ENOTDIR: | |
1500 | goto no_open; | |
1501 | case -ELOOP: | |
1502 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1503 | goto no_open; |
0dd2b474 | 1504 | break; |
1da177e4 | 1505 | /* case -EINVAL: */ |
0dd2b474 MS |
1506 | default: |
1507 | break; | |
1da177e4 | 1508 | } |
0dd2b474 | 1509 | goto out_err; |
cd9a1c0e | 1510 | } |
f46e0bd3 | 1511 | res = d_add_unique(dentry, inode); |
0dd2b474 | 1512 | if (res != NULL) |
1da177e4 | 1513 | dentry = res; |
0dd2b474 MS |
1514 | |
1515 | nfs_unblock_sillyrename(dentry->d_parent); | |
f46e0bd3 | 1516 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1517 | |
1518 | filp = nfs_finish_open(ctx, dentry, od, open_flags); | |
1519 | ||
1520 | dput(res); | |
1521 | return filp; | |
1522 | ||
1523 | out_err: | |
1524 | return ERR_PTR(err); | |
1525 | ||
1da177e4 | 1526 | no_open: |
0dd2b474 MS |
1527 | res = nfs_lookup(dir, dentry, NULL); |
1528 | err = PTR_ERR(res); | |
1529 | if (IS_ERR(res)) | |
1530 | goto out_err; | |
1531 | ||
1532 | finish_no_open(od, res); | |
1533 | return NULL; | |
1da177e4 LT |
1534 | } |
1535 | ||
0ef97dcf | 1536 | static int nfs4_lookup_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1537 | { |
1538 | struct dentry *parent = NULL; | |
657e94b6 | 1539 | struct inode *inode; |
1da177e4 | 1540 | struct inode *dir; |
50de348c | 1541 | int ret = 0; |
1da177e4 | 1542 | |
657e94b6 NP |
1543 | if (nd->flags & LOOKUP_RCU) |
1544 | return -ECHILD; | |
1545 | ||
1546 | inode = dentry->d_inode; | |
1f063d2c | 1547 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1548 | goto no_open; |
2b484297 | 1549 | |
1da177e4 LT |
1550 | parent = dget_parent(dentry); |
1551 | dir = parent->d_inode; | |
2b484297 | 1552 | |
1da177e4 LT |
1553 | /* We can't create new files in nfs_open_revalidate(), so we |
1554 | * optimize away revalidation of negative dentries. | |
1555 | */ | |
216d5d06 TM |
1556 | if (inode == NULL) { |
1557 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1558 | ret = 1; | |
1da177e4 | 1559 | goto out; |
216d5d06 TM |
1560 | } |
1561 | ||
1da177e4 LT |
1562 | /* NFS only supports OPEN on regular files */ |
1563 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1564 | goto no_open_dput; |
1da177e4 | 1565 | /* We cannot do exclusive creation on a positive dentry */ |
50de348c | 1566 | if (nd && nd->flags & LOOKUP_EXCL) |
5584c306 | 1567 | goto no_open_dput; |
1da177e4 | 1568 | |
0ef97dcf MS |
1569 | /* Let f_op->open() actually open (and revalidate) the file */ |
1570 | ret = 1; | |
536e43d1 | 1571 | |
1da177e4 LT |
1572 | out: |
1573 | dput(parent); | |
1da177e4 | 1574 | return ret; |
535918f1 | 1575 | |
5584c306 | 1576 | no_open_dput: |
1da177e4 | 1577 | dput(parent); |
5584c306 | 1578 | no_open: |
1da177e4 LT |
1579 | return nfs_lookup_revalidate(dentry, nd); |
1580 | } | |
c0204fd2 | 1581 | |
1da177e4 LT |
1582 | #endif /* CONFIG_NFSV4 */ |
1583 | ||
1da177e4 LT |
1584 | /* |
1585 | * Code common to create, mkdir, and mknod. | |
1586 | */ | |
1587 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1588 | struct nfs_fattr *fattr) | |
1589 | { | |
fab728e1 TM |
1590 | struct dentry *parent = dget_parent(dentry); |
1591 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1592 | struct inode *inode; |
1593 | int error = -EACCES; | |
1594 | ||
fab728e1 TM |
1595 | d_drop(dentry); |
1596 | ||
1da177e4 LT |
1597 | /* We may have been initialized further down */ |
1598 | if (dentry->d_inode) | |
fab728e1 | 1599 | goto out; |
1da177e4 | 1600 | if (fhandle->size == 0) { |
80a16b21 | 1601 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1602 | if (error) |
fab728e1 | 1603 | goto out_error; |
1da177e4 | 1604 | } |
5724ab37 | 1605 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1606 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1607 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1608 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1609 | if (error < 0) |
fab728e1 | 1610 | goto out_error; |
1da177e4 | 1611 | } |
1da177e4 | 1612 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1613 | error = PTR_ERR(inode); |
1614 | if (IS_ERR(inode)) | |
fab728e1 TM |
1615 | goto out_error; |
1616 | d_add(dentry, inode); | |
1617 | out: | |
1618 | dput(parent); | |
1da177e4 | 1619 | return 0; |
fab728e1 TM |
1620 | out_error: |
1621 | nfs_mark_for_revalidate(dir); | |
1622 | dput(parent); | |
1623 | return error; | |
1da177e4 LT |
1624 | } |
1625 | ||
1626 | /* | |
1627 | * Following a failed create operation, we drop the dentry rather | |
1628 | * than retain a negative dentry. This avoids a problem in the event | |
1629 | * that the operation succeeded on the server, but an error in the | |
1630 | * reply path made it appear to have failed. | |
1631 | */ | |
4acdaf27 AV |
1632 | static int nfs_create(struct inode *dir, struct dentry *dentry, |
1633 | umode_t mode, struct nameidata *nd) | |
1da177e4 LT |
1634 | { |
1635 | struct iattr attr; | |
1636 | int error; | |
8a5e929d | 1637 | int open_flags = O_CREAT|O_EXCL; |
1da177e4 | 1638 | |
1e7cb3dc CL |
1639 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1640 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1641 | |
1642 | attr.ia_mode = mode; | |
1643 | attr.ia_valid = ATTR_MODE; | |
1644 | ||
50de348c MS |
1645 | if (nd && !(nd->flags & LOOKUP_EXCL)) |
1646 | open_flags = O_CREAT; | |
8a0eebf6 | 1647 | |
8867fe58 | 1648 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1649 | if (error != 0) |
1650 | goto out_err; | |
1da177e4 LT |
1651 | return 0; |
1652 | out_err: | |
1da177e4 LT |
1653 | d_drop(dentry); |
1654 | return error; | |
1655 | } | |
1656 | ||
1657 | /* | |
1658 | * See comments for nfs_proc_create regarding failed operations. | |
1659 | */ | |
1660 | static int | |
1a67aafb | 1661 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1662 | { |
1663 | struct iattr attr; | |
1664 | int status; | |
1665 | ||
1e7cb3dc CL |
1666 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1667 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1668 | |
1669 | if (!new_valid_dev(rdev)) | |
1670 | return -EINVAL; | |
1671 | ||
1672 | attr.ia_mode = mode; | |
1673 | attr.ia_valid = ATTR_MODE; | |
1674 | ||
1da177e4 | 1675 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1676 | if (status != 0) |
1677 | goto out_err; | |
1da177e4 LT |
1678 | return 0; |
1679 | out_err: | |
1da177e4 LT |
1680 | d_drop(dentry); |
1681 | return status; | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * See comments for nfs_proc_create regarding failed operations. | |
1686 | */ | |
18bb1db3 | 1687 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1688 | { |
1689 | struct iattr attr; | |
1690 | int error; | |
1691 | ||
1e7cb3dc CL |
1692 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1693 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1694 | |
1695 | attr.ia_valid = ATTR_MODE; | |
1696 | attr.ia_mode = mode | S_IFDIR; | |
1697 | ||
1da177e4 | 1698 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1699 | if (error != 0) |
1700 | goto out_err; | |
1da177e4 LT |
1701 | return 0; |
1702 | out_err: | |
1703 | d_drop(dentry); | |
1da177e4 LT |
1704 | return error; |
1705 | } | |
1706 | ||
d45b9d8b TM |
1707 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1708 | { | |
1709 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1710 | d_delete(dentry); | |
1711 | } | |
1712 | ||
1da177e4 LT |
1713 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1714 | { | |
1715 | int error; | |
1716 | ||
1e7cb3dc CL |
1717 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1718 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1719 | |
1da177e4 LT |
1720 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1721 | /* Ensure the VFS deletes this inode */ | |
1722 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1723 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1724 | else if (error == -ENOENT) |
1725 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1726 | |
1727 | return error; | |
1728 | } | |
1729 | ||
1da177e4 LT |
1730 | /* |
1731 | * Remove a file after making sure there are no pending writes, | |
1732 | * and after checking that the file has only one user. | |
1733 | * | |
1734 | * We invalidate the attribute cache and free the inode prior to the operation | |
1735 | * to avoid possible races if the server reuses the inode. | |
1736 | */ | |
1737 | static int nfs_safe_remove(struct dentry *dentry) | |
1738 | { | |
1739 | struct inode *dir = dentry->d_parent->d_inode; | |
1740 | struct inode *inode = dentry->d_inode; | |
1741 | int error = -EBUSY; | |
1742 | ||
1743 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1744 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1745 | ||
1746 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1747 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1748 | error = 0; | |
1749 | goto out; | |
1750 | } | |
1751 | ||
1da177e4 | 1752 | if (inode != NULL) { |
cae7a073 | 1753 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1754 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1755 | /* The VFS may want to delete this inode */ | |
1756 | if (error == 0) | |
1b83d707 | 1757 | nfs_drop_nlink(inode); |
5ba7cc48 | 1758 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1759 | } else |
1760 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1761 | if (error == -ENOENT) |
1762 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1763 | out: |
1764 | return error; | |
1765 | } | |
1766 | ||
1767 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1768 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1769 | * | |
1770 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1771 | */ | |
1772 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1773 | { | |
1774 | int error; | |
1775 | int need_rehash = 0; | |
1776 | ||
1777 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1778 | dir->i_ino, dentry->d_name.name); | |
1779 | ||
1da177e4 | 1780 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1781 | if (dentry->d_count > 1) { |
1da177e4 | 1782 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1783 | /* Start asynchronous writeout of the inode */ |
1784 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1785 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1786 | return error; |
1787 | } | |
1788 | if (!d_unhashed(dentry)) { | |
1789 | __d_drop(dentry); | |
1790 | need_rehash = 1; | |
1791 | } | |
1792 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1793 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1794 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1795 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1796 | } else if (need_rehash) | |
1797 | d_rehash(dentry); | |
1da177e4 LT |
1798 | return error; |
1799 | } | |
1800 | ||
873101b3 CL |
1801 | /* |
1802 | * To create a symbolic link, most file systems instantiate a new inode, | |
1803 | * add a page to it containing the path, then write it out to the disk | |
1804 | * using prepare_write/commit_write. | |
1805 | * | |
1806 | * Unfortunately the NFS client can't create the in-core inode first | |
1807 | * because it needs a file handle to create an in-core inode (see | |
1808 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1809 | * symlink request has completed on the server. | |
1810 | * | |
1811 | * So instead we allocate a raw page, copy the symname into it, then do | |
1812 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1813 | * now have a new file handle and can instantiate an in-core NFS inode | |
1814 | * and move the raw page into its mapping. | |
1815 | */ | |
1816 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1817 | { |
873101b3 CL |
1818 | struct pagevec lru_pvec; |
1819 | struct page *page; | |
1820 | char *kaddr; | |
1da177e4 | 1821 | struct iattr attr; |
873101b3 | 1822 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1823 | int error; |
1824 | ||
1825 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1826 | dir->i_ino, dentry->d_name.name, symname); | |
1827 | ||
873101b3 CL |
1828 | if (pathlen > PAGE_SIZE) |
1829 | return -ENAMETOOLONG; | |
1da177e4 | 1830 | |
873101b3 CL |
1831 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1832 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1833 | |
83d93f22 | 1834 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1835 | if (!page) |
873101b3 | 1836 | return -ENOMEM; |
873101b3 | 1837 | |
2b86ce2d | 1838 | kaddr = kmap_atomic(page); |
873101b3 CL |
1839 | memcpy(kaddr, symname, pathlen); |
1840 | if (pathlen < PAGE_SIZE) | |
1841 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1842 | kunmap_atomic(kaddr); |
873101b3 | 1843 | |
94a6d753 | 1844 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1845 | if (error != 0) { |
1846 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1847 | dir->i_sb->s_id, dir->i_ino, | |
1848 | dentry->d_name.name, symname, error); | |
1da177e4 | 1849 | d_drop(dentry); |
873101b3 | 1850 | __free_page(page); |
873101b3 CL |
1851 | return error; |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * No big deal if we can't add this page to the page cache here. | |
1856 | * READLINK will get the missing page from the server if needed. | |
1857 | */ | |
1858 | pagevec_init(&lru_pvec, 0); | |
1859 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1860 | GFP_KERNEL)) { | |
39cf8a13 | 1861 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1862 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1863 | SetPageUptodate(page); |
1864 | unlock_page(page); | |
1865 | } else | |
1866 | __free_page(page); | |
1867 | ||
873101b3 | 1868 | return 0; |
1da177e4 LT |
1869 | } |
1870 | ||
1871 | static int | |
1872 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1873 | { | |
1874 | struct inode *inode = old_dentry->d_inode; | |
1875 | int error; | |
1876 | ||
1877 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1878 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1879 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1880 | ||
9a3936aa TM |
1881 | nfs_inode_return_delegation(inode); |
1882 | ||
9697d234 | 1883 | d_drop(dentry); |
1da177e4 | 1884 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1885 | if (error == 0) { |
7de9c6ee | 1886 | ihold(inode); |
9697d234 | 1887 | d_add(dentry, inode); |
cf809556 | 1888 | } |
1da177e4 LT |
1889 | return error; |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * RENAME | |
1894 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1895 | * different file handle for the same inode after a rename (e.g. when | |
1896 | * moving to a different directory). A fail-safe method to do so would | |
1897 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1898 | * rename the old file using the sillyrename stuff. This way, the original | |
1899 | * file in old_dir will go away when the last process iput()s the inode. | |
1900 | * | |
1901 | * FIXED. | |
1902 | * | |
1903 | * It actually works quite well. One needs to have the possibility for | |
1904 | * at least one ".nfs..." file in each directory the file ever gets | |
1905 | * moved or linked to which happens automagically with the new | |
1906 | * implementation that only depends on the dcache stuff instead of | |
1907 | * using the inode layer | |
1908 | * | |
1909 | * Unfortunately, things are a little more complicated than indicated | |
1910 | * above. For a cross-directory move, we want to make sure we can get | |
1911 | * rid of the old inode after the operation. This means there must be | |
1912 | * no pending writes (if it's a file), and the use count must be 1. | |
1913 | * If these conditions are met, we can drop the dentries before doing | |
1914 | * the rename. | |
1915 | */ | |
1916 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1917 | struct inode *new_dir, struct dentry *new_dentry) | |
1918 | { | |
1919 | struct inode *old_inode = old_dentry->d_inode; | |
1920 | struct inode *new_inode = new_dentry->d_inode; | |
1921 | struct dentry *dentry = NULL, *rehash = NULL; | |
1922 | int error = -EBUSY; | |
1923 | ||
1da177e4 LT |
1924 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1925 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1926 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1927 | new_dentry->d_count); |
1da177e4 LT |
1928 | |
1929 | /* | |
28f79a1a MS |
1930 | * For non-directories, check whether the target is busy and if so, |
1931 | * make a copy of the dentry and then do a silly-rename. If the | |
1932 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1933 | * the new target. | |
1da177e4 | 1934 | */ |
27226104 MS |
1935 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1936 | /* | |
1937 | * To prevent any new references to the target during the | |
1938 | * rename, we unhash the dentry in advance. | |
1939 | */ | |
1940 | if (!d_unhashed(new_dentry)) { | |
1941 | d_drop(new_dentry); | |
1942 | rehash = new_dentry; | |
1943 | } | |
1da177e4 | 1944 | |
b7ab39f6 | 1945 | if (new_dentry->d_count > 2) { |
27226104 MS |
1946 | int err; |
1947 | ||
1948 | /* copy the target dentry's name */ | |
1949 | dentry = d_alloc(new_dentry->d_parent, | |
1950 | &new_dentry->d_name); | |
1951 | if (!dentry) | |
1952 | goto out; | |
1953 | ||
1954 | /* silly-rename the existing target ... */ | |
1955 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1956 | if (err) |
27226104 | 1957 | goto out; |
24e93025 MS |
1958 | |
1959 | new_dentry = dentry; | |
56335936 | 1960 | rehash = NULL; |
24e93025 | 1961 | new_inode = NULL; |
27226104 | 1962 | } |
b1e4adf4 | 1963 | } |
1da177e4 | 1964 | |
cae7a073 | 1965 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 1966 | if (new_inode != NULL) |
24174119 | 1967 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 1968 | |
1da177e4 LT |
1969 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1970 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1971 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1972 | out: |
1973 | if (rehash) | |
1974 | d_rehash(rehash); | |
1975 | if (!error) { | |
b1e4adf4 TM |
1976 | if (new_inode != NULL) |
1977 | nfs_drop_nlink(new_inode); | |
349457cc | 1978 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1979 | nfs_set_verifier(new_dentry, |
1980 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1981 | } else if (error == -ENOENT) |
1982 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1983 | |
1984 | /* new dentry created? */ | |
1985 | if (dentry) | |
1986 | dput(dentry); | |
1da177e4 LT |
1987 | return error; |
1988 | } | |
1989 | ||
cfcea3e8 TM |
1990 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1991 | static LIST_HEAD(nfs_access_lru_list); | |
1992 | static atomic_long_t nfs_access_nr_entries; | |
1993 | ||
1c3c07e9 TM |
1994 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1995 | { | |
1996 | put_rpccred(entry->cred); | |
1997 | kfree(entry); | |
cfcea3e8 TM |
1998 | smp_mb__before_atomic_dec(); |
1999 | atomic_long_dec(&nfs_access_nr_entries); | |
2000 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
2001 | } |
2002 | ||
1a81bb8a TM |
2003 | static void nfs_access_free_list(struct list_head *head) |
2004 | { | |
2005 | struct nfs_access_entry *cache; | |
2006 | ||
2007 | while (!list_empty(head)) { | |
2008 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2009 | list_del(&cache->lru); | |
2010 | nfs_access_free_entry(cache); | |
2011 | } | |
2012 | } | |
2013 | ||
1495f230 YH |
2014 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
2015 | struct shrink_control *sc) | |
979df72e TM |
2016 | { |
2017 | LIST_HEAD(head); | |
aa510da5 | 2018 | struct nfs_inode *nfsi, *next; |
979df72e | 2019 | struct nfs_access_entry *cache; |
1495f230 YH |
2020 | int nr_to_scan = sc->nr_to_scan; |
2021 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 2022 | |
61d5eb29 TM |
2023 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
2024 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 2025 | |
a50f7951 | 2026 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2027 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2028 | struct inode *inode; |
2029 | ||
2030 | if (nr_to_scan-- == 0) | |
2031 | break; | |
9c7e7e23 | 2032 | inode = &nfsi->vfs_inode; |
979df72e TM |
2033 | spin_lock(&inode->i_lock); |
2034 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2035 | goto remove_lru_entry; | |
2036 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2037 | struct nfs_access_entry, lru); | |
2038 | list_move(&cache->lru, &head); | |
2039 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
2040 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
2041 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2042 | &nfs_access_lru_list); | |
2043 | else { | |
2044 | remove_lru_entry: | |
2045 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2046 | smp_mb__before_clear_bit(); |
979df72e | 2047 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2048 | smp_mb__after_clear_bit(); |
979df72e | 2049 | } |
59844a9b | 2050 | spin_unlock(&inode->i_lock); |
979df72e TM |
2051 | } |
2052 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2053 | nfs_access_free_list(&head); |
979df72e TM |
2054 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2055 | } | |
2056 | ||
1a81bb8a | 2057 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2058 | { |
1c3c07e9 | 2059 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2060 | struct rb_node *n; |
1c3c07e9 TM |
2061 | struct nfs_access_entry *entry; |
2062 | ||
2063 | /* Unhook entries from the cache */ | |
2064 | while ((n = rb_first(root_node)) != NULL) { | |
2065 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2066 | rb_erase(n, root_node); | |
1a81bb8a | 2067 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2068 | } |
2069 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2070 | } |
2071 | ||
1c3c07e9 | 2072 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2073 | { |
1a81bb8a TM |
2074 | LIST_HEAD(head); |
2075 | ||
2076 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2077 | return; | |
cfcea3e8 | 2078 | /* Remove from global LRU init */ |
1a81bb8a TM |
2079 | spin_lock(&nfs_access_lru_lock); |
2080 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2081 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2082 | |
1c3c07e9 | 2083 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2084 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2085 | spin_unlock(&inode->i_lock); | |
2086 | spin_unlock(&nfs_access_lru_lock); | |
2087 | nfs_access_free_list(&head); | |
1c3c07e9 | 2088 | } |
1da177e4 | 2089 | |
1c3c07e9 TM |
2090 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2091 | { | |
2092 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2093 | struct nfs_access_entry *entry; | |
2094 | ||
2095 | while (n != NULL) { | |
2096 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2097 | ||
2098 | if (cred < entry->cred) | |
2099 | n = n->rb_left; | |
2100 | else if (cred > entry->cred) | |
2101 | n = n->rb_right; | |
2102 | else | |
2103 | return entry; | |
1da177e4 | 2104 | } |
1c3c07e9 TM |
2105 | return NULL; |
2106 | } | |
2107 | ||
af22f94a | 2108 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2109 | { |
2110 | struct nfs_inode *nfsi = NFS_I(inode); | |
2111 | struct nfs_access_entry *cache; | |
2112 | int err = -ENOENT; | |
2113 | ||
dc59250c | 2114 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2115 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2116 | goto out_zap; | |
2117 | cache = nfs_access_search_rbtree(inode, cred); | |
2118 | if (cache == NULL) | |
2119 | goto out; | |
b4d2314b | 2120 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2121 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2122 | goto out_stale; |
2123 | res->jiffies = cache->jiffies; | |
2124 | res->cred = cache->cred; | |
2125 | res->mask = cache->mask; | |
cfcea3e8 | 2126 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2127 | err = 0; |
2128 | out: | |
2129 | spin_unlock(&inode->i_lock); | |
2130 | return err; | |
2131 | out_stale: | |
2132 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2133 | list_del(&cache->lru); |
1c3c07e9 TM |
2134 | spin_unlock(&inode->i_lock); |
2135 | nfs_access_free_entry(cache); | |
2136 | return -ENOENT; | |
2137 | out_zap: | |
1a81bb8a TM |
2138 | spin_unlock(&inode->i_lock); |
2139 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2140 | return -ENOENT; |
2141 | } | |
2142 | ||
2143 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2144 | { | |
cfcea3e8 TM |
2145 | struct nfs_inode *nfsi = NFS_I(inode); |
2146 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2147 | struct rb_node **p = &root_node->rb_node; |
2148 | struct rb_node *parent = NULL; | |
2149 | struct nfs_access_entry *entry; | |
2150 | ||
2151 | spin_lock(&inode->i_lock); | |
2152 | while (*p != NULL) { | |
2153 | parent = *p; | |
2154 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2155 | ||
2156 | if (set->cred < entry->cred) | |
2157 | p = &parent->rb_left; | |
2158 | else if (set->cred > entry->cred) | |
2159 | p = &parent->rb_right; | |
2160 | else | |
2161 | goto found; | |
2162 | } | |
2163 | rb_link_node(&set->rb_node, parent, p); | |
2164 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2165 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2166 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2167 | return; |
2168 | found: | |
2169 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2170 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2171 | list_del(&entry->lru); | |
1c3c07e9 TM |
2172 | spin_unlock(&inode->i_lock); |
2173 | nfs_access_free_entry(entry); | |
2174 | } | |
2175 | ||
af22f94a | 2176 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2177 | { |
2178 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2179 | if (cache == NULL) | |
2180 | return; | |
2181 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2182 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2183 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2184 | cache->mask = set->mask; |
1c3c07e9 TM |
2185 | |
2186 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2187 | |
2188 | /* Update accounting */ | |
2189 | smp_mb__before_atomic_inc(); | |
2190 | atomic_long_inc(&nfs_access_nr_entries); | |
2191 | smp_mb__after_atomic_inc(); | |
2192 | ||
2193 | /* Add inode to global LRU list */ | |
1a81bb8a | 2194 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2195 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2196 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2197 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2198 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2199 | spin_unlock(&nfs_access_lru_lock); |
2200 | } | |
1da177e4 LT |
2201 | } |
2202 | ||
2203 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2204 | { | |
2205 | struct nfs_access_entry cache; | |
2206 | int status; | |
2207 | ||
2208 | status = nfs_access_get_cached(inode, cred, &cache); | |
2209 | if (status == 0) | |
2210 | goto out; | |
2211 | ||
2212 | /* Be clever: ask server to check for all possible rights */ | |
2213 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2214 | cache.cred = cred; | |
2215 | cache.jiffies = jiffies; | |
2216 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2217 | if (status != 0) { |
2218 | if (status == -ESTALE) { | |
2219 | nfs_zap_caches(inode); | |
2220 | if (!S_ISDIR(inode->i_mode)) | |
2221 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2222 | } | |
1da177e4 | 2223 | return status; |
a71ee337 | 2224 | } |
1da177e4 LT |
2225 | nfs_access_add_cache(inode, &cache); |
2226 | out: | |
e6305c43 | 2227 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2228 | return 0; |
2229 | return -EACCES; | |
2230 | } | |
2231 | ||
af22f94a TM |
2232 | static int nfs_open_permission_mask(int openflags) |
2233 | { | |
2234 | int mask = 0; | |
2235 | ||
8a5e929d | 2236 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2237 | mask |= MAY_READ; |
8a5e929d | 2238 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2239 | mask |= MAY_WRITE; |
8a5e929d | 2240 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2241 | mask |= MAY_EXEC; |
2242 | return mask; | |
2243 | } | |
2244 | ||
2245 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2246 | { | |
2247 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2248 | } | |
2249 | ||
10556cb2 | 2250 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2251 | { |
2252 | struct rpc_cred *cred; | |
2253 | int res = 0; | |
2254 | ||
10556cb2 | 2255 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2256 | return -ECHILD; |
2257 | ||
91d5b470 CL |
2258 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2259 | ||
e6305c43 | 2260 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2261 | goto out; |
2262 | /* Is this sys_access() ? */ | |
9cfcac81 | 2263 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2264 | goto force_lookup; |
2265 | ||
2266 | switch (inode->i_mode & S_IFMT) { | |
2267 | case S_IFLNK: | |
2268 | goto out; | |
2269 | case S_IFREG: | |
2270 | /* NFSv4 has atomic_open... */ | |
2271 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2272 | && (mask & MAY_OPEN) |
2273 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2274 | goto out; |
2275 | break; | |
2276 | case S_IFDIR: | |
2277 | /* | |
2278 | * Optimize away all write operations, since the server | |
2279 | * will check permissions when we perform the op. | |
2280 | */ | |
2281 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2282 | goto out; | |
2283 | } | |
2284 | ||
2285 | force_lookup: | |
1da177e4 LT |
2286 | if (!NFS_PROTO(inode)->access) |
2287 | goto out_notsup; | |
2288 | ||
98a8e323 | 2289 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2290 | if (!IS_ERR(cred)) { |
2291 | res = nfs_do_access(inode, cred, mask); | |
2292 | put_rpccred(cred); | |
2293 | } else | |
2294 | res = PTR_ERR(cred); | |
1da177e4 | 2295 | out: |
f696a365 MS |
2296 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2297 | res = -EACCES; | |
2298 | ||
1e7cb3dc CL |
2299 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2300 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2301 | return res; |
2302 | out_notsup: | |
2303 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2304 | if (res == 0) | |
2830ba7f | 2305 | res = generic_permission(inode, mask); |
1e7cb3dc | 2306 | goto out; |
1da177e4 LT |
2307 | } |
2308 | ||
2309 | /* | |
2310 | * Local variables: | |
2311 | * version-control: t | |
2312 | * kept-new-versions: 5 | |
2313 | * End: | |
2314 | */ |