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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/dir.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs directory handling functions | |
7 | * | |
8 | * 10 Apr 1996 Added silly rename for unlink --okir | |
9 | * 28 Sep 1996 Improved directory cache --okir | |
10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
11 | * Re-implemented silly rename for unlink, newly implemented | |
12 | * silly rename for nfs_rename() following the suggestions | |
13 | * of Olaf Kirch (okir) found in this file. | |
14 | * Following Linus comments on my original hack, this version | |
15 | * depends only on the dcache stuff and doesn't touch the inode | |
16 | * layer (iput() and friends). | |
17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
18 | */ | |
19 | ||
20 | #include <linux/time.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/stat.h> | |
23 | #include <linux/fcntl.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/sunrpc/clnt.h> | |
29 | #include <linux/nfs_fs.h> | |
30 | #include <linux/nfs_mount.h> | |
31 | #include <linux/pagemap.h> | |
873101b3 | 32 | #include <linux/pagevec.h> |
1da177e4 | 33 | #include <linux/namei.h> |
54ceac45 | 34 | #include <linux/mount.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
04e4bd1c | 36 | #include <linux/kmemleak.h> |
64c2ce8b | 37 | #include <linux/xattr.h> |
1da177e4 LT |
38 | |
39 | #include "delegation.h" | |
91d5b470 | 40 | #include "iostat.h" |
4c30d56e | 41 | #include "internal.h" |
cd9a1c0e | 42 | #include "fscache.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | /* #define NFS_DEBUG_VERBOSE 1 */ |
45 | ||
46 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 47 | static int nfs_closedir(struct inode *, struct file *); |
1da177e4 LT |
48 | static int nfs_readdir(struct file *, void *, filldir_t); |
49 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
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 | ||
114 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); | |
4acdaf27 | 115 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd); |
92e1d5be | 116 | const struct inode_operations nfs4_dir_inode_operations = { |
c0204fd2 | 117 | .create = nfs_open_create, |
1da177e4 LT |
118 | .lookup = nfs_atomic_lookup, |
119 | .link = nfs_link, | |
120 | .unlink = nfs_unlink, | |
121 | .symlink = nfs_symlink, | |
122 | .mkdir = nfs_mkdir, | |
123 | .rmdir = nfs_rmdir, | |
124 | .mknod = nfs_mknod, | |
125 | .rename = nfs_rename, | |
126 | .permission = nfs_permission, | |
127 | .getattr = nfs_getattr, | |
128 | .setattr = nfs_setattr, | |
64c2ce8b AK |
129 | .getxattr = generic_getxattr, |
130 | .setxattr = generic_setxattr, | |
131 | .listxattr = generic_listxattr, | |
132 | .removexattr = generic_removexattr, | |
1da177e4 LT |
133 | }; |
134 | ||
135 | #endif /* CONFIG_NFS_V4 */ | |
136 | ||
0c030806 | 137 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
138 | { |
139 | struct nfs_open_dir_context *ctx; | |
140 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
141 | if (ctx != NULL) { | |
8ef2ce3e | 142 | ctx->duped = 0; |
0c030806 | 143 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 144 | ctx->dir_cookie = 0; |
8ef2ce3e | 145 | ctx->dup_cookie = 0; |
480c2006 | 146 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
147 | return ctx; |
148 | } | |
149 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
150 | } |
151 | ||
152 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
153 | { | |
154 | put_rpccred(ctx->cred); | |
155 | kfree(ctx); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * Open file | |
160 | */ | |
161 | static int | |
162 | nfs_opendir(struct inode *inode, struct file *filp) | |
163 | { | |
480c2006 BS |
164 | int res = 0; |
165 | struct nfs_open_dir_context *ctx; | |
166 | struct rpc_cred *cred; | |
1da177e4 | 167 | |
6da24bc9 | 168 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
169 | filp->f_path.dentry->d_parent->d_name.name, |
170 | filp->f_path.dentry->d_name.name); | |
171 | ||
172 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 173 | |
480c2006 BS |
174 | cred = rpc_lookup_cred(); |
175 | if (IS_ERR(cred)) | |
176 | return PTR_ERR(cred); | |
0c030806 | 177 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
178 | if (IS_ERR(ctx)) { |
179 | res = PTR_ERR(ctx); | |
180 | goto out; | |
181 | } | |
182 | filp->private_data = ctx; | |
f5a73672 NB |
183 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
184 | /* This is a mountpoint, so d_revalidate will never | |
185 | * have been called, so we need to refresh the | |
186 | * inode (for close-open consistency) ourselves. | |
187 | */ | |
188 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
189 | } | |
480c2006 BS |
190 | out: |
191 | put_rpccred(cred); | |
1da177e4 LT |
192 | return res; |
193 | } | |
194 | ||
480c2006 BS |
195 | static int |
196 | nfs_closedir(struct inode *inode, struct file *filp) | |
197 | { | |
198 | put_nfs_open_dir_context(filp->private_data); | |
199 | return 0; | |
200 | } | |
201 | ||
d1bacf9e BS |
202 | struct nfs_cache_array_entry { |
203 | u64 cookie; | |
204 | u64 ino; | |
205 | struct qstr string; | |
0b26a0bf | 206 | unsigned char d_type; |
d1bacf9e BS |
207 | }; |
208 | ||
209 | struct nfs_cache_array { | |
210 | unsigned int size; | |
211 | int eof_index; | |
212 | u64 last_cookie; | |
213 | struct nfs_cache_array_entry array[0]; | |
214 | }; | |
215 | ||
573c4e1e | 216 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
217 | typedef struct { |
218 | struct file *file; | |
219 | struct page *page; | |
220 | unsigned long page_index; | |
f0dd2136 | 221 | u64 *dir_cookie; |
0aded708 | 222 | u64 last_cookie; |
f0dd2136 | 223 | loff_t current_index; |
1da177e4 | 224 | decode_dirent_t decode; |
d1bacf9e | 225 | |
1f4eab7e | 226 | unsigned long timestamp; |
4704f0e2 | 227 | unsigned long gencount; |
d1bacf9e BS |
228 | unsigned int cache_entry_index; |
229 | unsigned int plus:1; | |
230 | unsigned int eof:1; | |
1da177e4 LT |
231 | } nfs_readdir_descriptor_t; |
232 | ||
d1bacf9e BS |
233 | /* |
234 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
235 | */ |
236 | static | |
d1bacf9e BS |
237 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
238 | { | |
8cd51a0c | 239 | void *ptr; |
d1bacf9e BS |
240 | if (page == NULL) |
241 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
242 | ptr = kmap(page); |
243 | if (ptr == NULL) | |
244 | return ERR_PTR(-ENOMEM); | |
245 | return ptr; | |
d1bacf9e BS |
246 | } |
247 | ||
248 | static | |
249 | void nfs_readdir_release_array(struct page *page) | |
250 | { | |
251 | kunmap(page); | |
252 | } | |
253 | ||
254 | /* | |
255 | * we are freeing strings created by nfs_add_to_readdir_array() | |
256 | */ | |
257 | static | |
11de3b11 | 258 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 259 | { |
11de3b11 | 260 | struct nfs_cache_array *array; |
d1bacf9e | 261 | int i; |
8cd51a0c | 262 | |
11de3b11 | 263 | array = kmap_atomic(page, KM_USER0); |
d1bacf9e BS |
264 | for (i = 0; i < array->size; i++) |
265 | kfree(array->array[i].string.name); | |
11de3b11 | 266 | kunmap_atomic(array, KM_USER0); |
d1bacf9e BS |
267 | } |
268 | ||
269 | /* | |
270 | * the caller is responsible for freeing qstr.name | |
271 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
272 | * nfs_clear_readdir_array() | |
273 | */ | |
274 | static | |
4a201d6e | 275 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
276 | { |
277 | string->len = len; | |
278 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
279 | if (string->name == NULL) |
280 | return -ENOMEM; | |
04e4bd1c CM |
281 | /* |
282 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
283 | * in a page cache page which kmemleak does not scan. | |
284 | */ | |
285 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
286 | string->hash = full_name_hash(name, len); |
287 | return 0; | |
d1bacf9e BS |
288 | } |
289 | ||
290 | static | |
291 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
292 | { | |
293 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
294 | struct nfs_cache_array_entry *cache_entry; |
295 | int ret; | |
296 | ||
d1bacf9e BS |
297 | if (IS_ERR(array)) |
298 | return PTR_ERR(array); | |
3020093f TM |
299 | |
300 | cache_entry = &array->array[array->size]; | |
301 | ||
302 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 303 | ret = -ENOSPC; |
3020093f | 304 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 305 | goto out; |
d1bacf9e | 306 | |
4a201d6e TM |
307 | cache_entry->cookie = entry->prev_cookie; |
308 | cache_entry->ino = entry->ino; | |
0b26a0bf | 309 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
310 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
311 | if (ret) | |
312 | goto out; | |
d1bacf9e | 313 | array->last_cookie = entry->cookie; |
8cd51a0c | 314 | array->size++; |
47c716cb | 315 | if (entry->eof != 0) |
d1bacf9e | 316 | array->eof_index = array->size; |
4a201d6e | 317 | out: |
d1bacf9e | 318 | nfs_readdir_release_array(page); |
4a201d6e | 319 | return ret; |
d1bacf9e BS |
320 | } |
321 | ||
322 | static | |
323 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
324 | { | |
325 | loff_t diff = desc->file->f_pos - desc->current_index; | |
326 | unsigned int index; | |
327 | ||
328 | if (diff < 0) | |
329 | goto out_eof; | |
330 | if (diff >= array->size) { | |
8cd51a0c | 331 | if (array->eof_index >= 0) |
d1bacf9e | 332 | goto out_eof; |
d1bacf9e BS |
333 | return -EAGAIN; |
334 | } | |
335 | ||
336 | index = (unsigned int)diff; | |
337 | *desc->dir_cookie = array->array[index].cookie; | |
338 | desc->cache_entry_index = index; | |
d1bacf9e BS |
339 | return 0; |
340 | out_eof: | |
341 | desc->eof = 1; | |
342 | return -EBADCOOKIE; | |
343 | } | |
344 | ||
345 | static | |
346 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
347 | { | |
348 | int i; | |
8ef2ce3e | 349 | loff_t new_pos; |
d1bacf9e BS |
350 | int status = -EAGAIN; |
351 | ||
352 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 353 | if (array->array[i].cookie == *desc->dir_cookie) { |
0c030806 TM |
354 | struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode); |
355 | struct nfs_open_dir_context *ctx = desc->file->private_data; | |
356 | ||
8ef2ce3e | 357 | new_pos = desc->current_index + i; |
0c030806 TM |
358 | if (ctx->attr_gencount != nfsi->attr_gencount |
359 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
360 | ctx->duped = 0; | |
361 | ctx->attr_gencount = nfsi->attr_gencount; | |
362 | } else if (new_pos < desc->file->f_pos) { | |
363 | if (ctx->duped > 0 | |
364 | && ctx->dup_cookie == *desc->dir_cookie) { | |
365 | if (printk_ratelimit()) { | |
366 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
367 | "Please contact your server vendor. " | |
374e4e3e | 368 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
369 | desc->file->f_dentry->d_parent->d_name.name, |
370 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 371 | array->array[i].string.name, |
0c030806 TM |
372 | *desc->dir_cookie); |
373 | } | |
374 | status = -ELOOP; | |
375 | goto out; | |
376 | } | |
8ef2ce3e | 377 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 378 | ctx->duped = -1; |
8ef2ce3e BS |
379 | } |
380 | desc->file->f_pos = new_pos; | |
d1bacf9e | 381 | desc->cache_entry_index = i; |
47c716cb | 382 | return 0; |
d1bacf9e BS |
383 | } |
384 | } | |
47c716cb | 385 | if (array->eof_index >= 0) { |
8cd51a0c | 386 | status = -EBADCOOKIE; |
18fb5fe4 TM |
387 | if (*desc->dir_cookie == array->last_cookie) |
388 | desc->eof = 1; | |
8cd51a0c | 389 | } |
0c030806 | 390 | out: |
d1bacf9e BS |
391 | return status; |
392 | } | |
393 | ||
394 | static | |
395 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
396 | { | |
397 | struct nfs_cache_array *array; | |
47c716cb | 398 | int status; |
d1bacf9e BS |
399 | |
400 | array = nfs_readdir_get_array(desc->page); | |
401 | if (IS_ERR(array)) { | |
402 | status = PTR_ERR(array); | |
403 | goto out; | |
404 | } | |
405 | ||
406 | if (*desc->dir_cookie == 0) | |
407 | status = nfs_readdir_search_for_pos(array, desc); | |
408 | else | |
409 | status = nfs_readdir_search_for_cookie(array, desc); | |
410 | ||
47c716cb | 411 | if (status == -EAGAIN) { |
0aded708 | 412 | desc->last_cookie = array->last_cookie; |
e47c085a | 413 | desc->current_index += array->size; |
47c716cb TM |
414 | desc->page_index++; |
415 | } | |
d1bacf9e BS |
416 | nfs_readdir_release_array(desc->page); |
417 | out: | |
418 | return status; | |
419 | } | |
420 | ||
421 | /* Fill a page with xdr information before transferring to the cache page */ | |
422 | static | |
56e4ebf8 | 423 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 424 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 425 | { |
480c2006 BS |
426 | struct nfs_open_dir_context *ctx = file->private_data; |
427 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 428 | unsigned long timestamp, gencount; |
1da177e4 LT |
429 | int error; |
430 | ||
1da177e4 LT |
431 | again: |
432 | timestamp = jiffies; | |
4704f0e2 | 433 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 434 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
435 | NFS_SERVER(inode)->dtsize, desc->plus); |
436 | if (error < 0) { | |
437 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
438 | if (error == -ENOTSUPP && desc->plus) { | |
439 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 440 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
441 | desc->plus = 0; |
442 | goto again; | |
443 | } | |
444 | goto error; | |
445 | } | |
1f4eab7e | 446 | desc->timestamp = timestamp; |
4704f0e2 | 447 | desc->gencount = gencount; |
d1bacf9e BS |
448 | error: |
449 | return error; | |
1da177e4 LT |
450 | } |
451 | ||
573c4e1e CL |
452 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
453 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 454 | { |
573c4e1e | 455 | int error; |
1da177e4 | 456 | |
573c4e1e CL |
457 | error = desc->decode(xdr, entry, desc->plus); |
458 | if (error) | |
459 | return error; | |
d1bacf9e BS |
460 | entry->fattr->time_start = desc->timestamp; |
461 | entry->fattr->gencount = desc->gencount; | |
462 | return 0; | |
1da177e4 LT |
463 | } |
464 | ||
d39ab9de BS |
465 | static |
466 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
467 | { | |
d39ab9de BS |
468 | if (dentry->d_inode == NULL) |
469 | goto different; | |
37a09f07 | 470 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
471 | goto different; |
472 | return 1; | |
473 | different: | |
474 | return 0; | |
475 | } | |
476 | ||
477 | static | |
478 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
479 | { | |
4a201d6e TM |
480 | struct qstr filename = { |
481 | .len = entry->len, | |
482 | .name = entry->name, | |
483 | }; | |
484 | struct dentry *dentry; | |
485 | struct dentry *alias; | |
d39ab9de BS |
486 | struct inode *dir = parent->d_inode; |
487 | struct inode *inode; | |
488 | ||
4a201d6e TM |
489 | if (filename.name[0] == '.') { |
490 | if (filename.len == 1) | |
491 | return; | |
492 | if (filename.len == 2 && filename.name[1] == '.') | |
493 | return; | |
494 | } | |
495 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 496 | |
4a201d6e | 497 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
498 | if (dentry != NULL) { |
499 | if (nfs_same_file(dentry, entry)) { | |
500 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
501 | goto out; | |
502 | } else { | |
503 | d_drop(dentry); | |
504 | dput(dentry); | |
505 | } | |
506 | } | |
507 | ||
508 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
509 | if (dentry == NULL) |
510 | return; | |
511 | ||
d39ab9de BS |
512 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
513 | if (IS_ERR(inode)) | |
514 | goto out; | |
515 | ||
516 | alias = d_materialise_unique(dentry, inode); | |
517 | if (IS_ERR(alias)) | |
518 | goto out; | |
519 | else if (alias) { | |
520 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
521 | dput(alias); | |
522 | } else | |
523 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
524 | ||
525 | out: | |
526 | dput(dentry); | |
d39ab9de BS |
527 | } |
528 | ||
d1bacf9e BS |
529 | /* Perform conversion from xdr to cache array */ |
530 | static | |
8cd51a0c | 531 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 532 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 533 | { |
babddc72 | 534 | struct xdr_stream stream; |
f7da7a12 | 535 | struct xdr_buf buf; |
6650239a | 536 | struct page *scratch; |
99424380 | 537 | struct nfs_cache_array *array; |
5c346854 TM |
538 | unsigned int count = 0; |
539 | int status; | |
babddc72 | 540 | |
6650239a TM |
541 | scratch = alloc_page(GFP_KERNEL); |
542 | if (scratch == NULL) | |
543 | return -ENOMEM; | |
babddc72 | 544 | |
f7da7a12 | 545 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 546 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
547 | |
548 | do { | |
549 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
550 | if (status != 0) { |
551 | if (status == -EAGAIN) | |
552 | status = 0; | |
99424380 | 553 | break; |
8cd51a0c | 554 | } |
99424380 | 555 | |
5c346854 TM |
556 | count++; |
557 | ||
47c716cb | 558 | if (desc->plus != 0) |
d39ab9de | 559 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
560 | |
561 | status = nfs_readdir_add_to_array(entry, page); | |
562 | if (status != 0) | |
563 | break; | |
99424380 BS |
564 | } while (!entry->eof); |
565 | ||
47c716cb | 566 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 567 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
568 | if (!IS_ERR(array)) { |
569 | array->eof_index = array->size; | |
570 | status = 0; | |
571 | nfs_readdir_release_array(page); | |
5c346854 TM |
572 | } else |
573 | status = PTR_ERR(array); | |
1da177e4 | 574 | } |
6650239a TM |
575 | |
576 | put_page(scratch); | |
8cd51a0c | 577 | return status; |
56e4ebf8 BS |
578 | } |
579 | ||
580 | static | |
581 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
582 | { | |
583 | unsigned int i; | |
584 | for (i = 0; i < npages; i++) | |
585 | put_page(pages[i]); | |
586 | } | |
587 | ||
588 | static | |
589 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
590 | unsigned int npages) | |
591 | { | |
56e4ebf8 BS |
592 | nfs_readdir_free_pagearray(pages, npages); |
593 | } | |
594 | ||
595 | /* | |
596 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
597 | * to nfs_readdir_free_large_page | |
598 | */ | |
599 | static | |
6650239a | 600 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 601 | { |
56e4ebf8 BS |
602 | unsigned int i; |
603 | ||
604 | for (i = 0; i < npages; i++) { | |
605 | struct page *page = alloc_page(GFP_KERNEL); | |
606 | if (page == NULL) | |
607 | goto out_freepages; | |
608 | pages[i] = page; | |
609 | } | |
6650239a | 610 | return 0; |
56e4ebf8 | 611 | |
56e4ebf8 BS |
612 | out_freepages: |
613 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 614 | return -ENOMEM; |
1da177e4 LT |
615 | } |
616 | ||
d1bacf9e BS |
617 | static |
618 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 619 | { |
56e4ebf8 BS |
620 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
621 | void *pages_ptr = NULL; | |
d1bacf9e BS |
622 | struct nfs_entry entry; |
623 | struct file *file = desc->file; | |
624 | struct nfs_cache_array *array; | |
8cd51a0c | 625 | int status = -ENOMEM; |
56e4ebf8 | 626 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
627 | |
628 | entry.prev_cookie = 0; | |
0aded708 | 629 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
630 | entry.eof = 0; |
631 | entry.fh = nfs_alloc_fhandle(); | |
632 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 633 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
634 | if (entry.fh == NULL || entry.fattr == NULL) |
635 | goto out; | |
00a92642 | 636 | |
d1bacf9e | 637 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
638 | if (IS_ERR(array)) { |
639 | status = PTR_ERR(array); | |
640 | goto out; | |
641 | } | |
d1bacf9e BS |
642 | memset(array, 0, sizeof(struct nfs_cache_array)); |
643 | array->eof_index = -1; | |
00a92642 | 644 | |
6650239a TM |
645 | status = nfs_readdir_large_page(pages, array_size); |
646 | if (status < 0) | |
d1bacf9e BS |
647 | goto out_release_array; |
648 | do { | |
ac396128 | 649 | unsigned int pglen; |
56e4ebf8 | 650 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 651 | |
d1bacf9e | 652 | if (status < 0) |
00a92642 | 653 | break; |
ac396128 | 654 | pglen = status; |
6650239a | 655 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
656 | if (status < 0) { |
657 | if (status == -ENOSPC) | |
658 | status = 0; | |
659 | break; | |
660 | } | |
661 | } while (array->eof_index < 0); | |
d1bacf9e | 662 | |
56e4ebf8 | 663 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
664 | out_release_array: |
665 | nfs_readdir_release_array(page); | |
666 | out: | |
667 | nfs_free_fattr(entry.fattr); | |
668 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
669 | return status; |
670 | } | |
671 | ||
672 | /* | |
d1bacf9e BS |
673 | * Now we cache directories properly, by converting xdr information |
674 | * to an array that can be used for lookups later. This results in | |
675 | * fewer cache pages, since we can store more information on each page. | |
676 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 677 | */ |
d1bacf9e BS |
678 | static |
679 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 680 | { |
01cce933 | 681 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 682 | int ret; |
1da177e4 | 683 | |
8cd51a0c TM |
684 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
685 | if (ret < 0) | |
d1bacf9e BS |
686 | goto error; |
687 | SetPageUptodate(page); | |
1da177e4 | 688 | |
d1bacf9e BS |
689 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
690 | /* Should never happen */ | |
691 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 692 | } |
d1bacf9e BS |
693 | unlock_page(page); |
694 | return 0; | |
695 | error: | |
696 | unlock_page(page); | |
8cd51a0c | 697 | return ret; |
d1bacf9e | 698 | } |
1da177e4 | 699 | |
d1bacf9e BS |
700 | static |
701 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
702 | { | |
11de3b11 TM |
703 | if (!desc->page->mapping) |
704 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
705 | page_cache_release(desc->page); |
706 | desc->page = NULL; | |
707 | } | |
708 | ||
709 | static | |
710 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
711 | { | |
8cd51a0c | 712 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 713 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
714 | } |
715 | ||
716 | /* | |
d1bacf9e | 717 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 718 | */ |
d1bacf9e BS |
719 | static |
720 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
721 | { | |
722 | int res; | |
723 | ||
724 | desc->page = get_cache_page(desc); | |
725 | if (IS_ERR(desc->page)) | |
726 | return PTR_ERR(desc->page); | |
727 | ||
728 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
729 | if (res != 0) |
730 | cache_page_release(desc); | |
d1bacf9e BS |
731 | return res; |
732 | } | |
733 | ||
734 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
735 | static inline |
736 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
737 | { | |
8cd51a0c | 738 | int res; |
d1bacf9e | 739 | |
0aded708 | 740 | if (desc->page_index == 0) { |
8cd51a0c | 741 | desc->current_index = 0; |
0aded708 TM |
742 | desc->last_cookie = 0; |
743 | } | |
47c716cb | 744 | do { |
d1bacf9e | 745 | res = find_cache_page(desc); |
47c716cb | 746 | } while (res == -EAGAIN); |
1da177e4 LT |
747 | return res; |
748 | } | |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Once we've found the start of the dirent within a page: fill 'er up... | |
752 | */ | |
753 | static | |
754 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
755 | filldir_t filldir) | |
756 | { | |
757 | struct file *file = desc->file; | |
d1bacf9e BS |
758 | int i = 0; |
759 | int res = 0; | |
760 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
761 | struct nfs_open_dir_context *ctx = file->private_data; |
762 | ||
d1bacf9e | 763 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
764 | if (IS_ERR(array)) { |
765 | res = PTR_ERR(array); | |
766 | goto out; | |
767 | } | |
d1bacf9e BS |
768 | |
769 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 770 | struct nfs_cache_array_entry *ent; |
1da177e4 | 771 | |
ece0b423 TM |
772 | ent = &array->array[i]; |
773 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
774 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
775 | ent->d_type) < 0) { | |
ece0b423 | 776 | desc->eof = 1; |
1da177e4 | 777 | break; |
ece0b423 | 778 | } |
00a92642 | 779 | file->f_pos++; |
d1bacf9e BS |
780 | if (i < (array->size-1)) |
781 | *desc->dir_cookie = array->array[i+1].cookie; | |
782 | else | |
783 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
784 | if (ctx->duped != 0) |
785 | ctx->duped = 1; | |
1da177e4 | 786 | } |
47c716cb | 787 | if (array->eof_index >= 0) |
8cd51a0c | 788 | desc->eof = 1; |
d1bacf9e BS |
789 | |
790 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 791 | out: |
d1bacf9e | 792 | cache_page_release(desc); |
1e7cb3dc CL |
793 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
794 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
795 | return res; |
796 | } | |
797 | ||
798 | /* | |
799 | * If we cannot find a cookie in our cache, we suspect that this is | |
800 | * because it points to a deleted file, so we ask the server to return | |
801 | * whatever it thinks is the next entry. We then feed this to filldir. | |
802 | * If all goes well, we should then be able to find our way round the | |
803 | * cache on the next call to readdir_search_pagecache(); | |
804 | * | |
805 | * NOTE: we cannot add the anonymous page to the pagecache because | |
806 | * the data it contains might not be page aligned. Besides, | |
807 | * we should already have a complete representation of the | |
808 | * directory in the page cache by the time we get here. | |
809 | */ | |
810 | static inline | |
811 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
812 | filldir_t filldir) | |
813 | { | |
1da177e4 LT |
814 | struct page *page = NULL; |
815 | int status; | |
d1bacf9e | 816 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
0c030806 | 817 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 818 | |
1e7cb3dc CL |
819 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
820 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
821 | |
822 | page = alloc_page(GFP_HIGHUSER); | |
823 | if (!page) { | |
824 | status = -ENOMEM; | |
825 | goto out; | |
826 | } | |
d1bacf9e | 827 | |
7a8e1dc3 | 828 | desc->page_index = 0; |
0aded708 | 829 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 830 | desc->page = page; |
0c030806 | 831 | ctx->duped = 0; |
7a8e1dc3 | 832 | |
85f8607e TM |
833 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
834 | if (status < 0) | |
1da177e4 LT |
835 | goto out_release; |
836 | ||
837 | status = nfs_do_filldir(desc, dirent, filldir); | |
838 | ||
1da177e4 | 839 | out: |
1e7cb3dc | 840 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 841 | __func__, status); |
1da177e4 LT |
842 | return status; |
843 | out_release: | |
d1bacf9e | 844 | cache_page_release(desc); |
1da177e4 LT |
845 | goto out; |
846 | } | |
847 | ||
00a92642 OG |
848 | /* The file offset position represents the dirent entry number. A |
849 | last cookie cache takes care of the common case of reading the | |
850 | whole directory. | |
1da177e4 LT |
851 | */ |
852 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
853 | { | |
01cce933 | 854 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
855 | struct inode *inode = dentry->d_inode; |
856 | nfs_readdir_descriptor_t my_desc, | |
857 | *desc = &my_desc; | |
480c2006 | 858 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 859 | int res; |
1da177e4 | 860 | |
6da24bc9 | 861 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
862 | dentry->d_parent->d_name.name, dentry->d_name.name, |
863 | (long long)filp->f_pos); | |
91d5b470 CL |
864 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
865 | ||
1da177e4 | 866 | /* |
00a92642 | 867 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 868 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
869 | * to either find the entry with the appropriate number or |
870 | * revalidate the cookie. | |
1da177e4 LT |
871 | */ |
872 | memset(desc, 0, sizeof(*desc)); | |
873 | ||
874 | desc->file = filp; | |
480c2006 | 875 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 LT |
876 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
877 | desc->plus = NFS_USE_READDIRPLUS(inode); | |
878 | ||
565277f6 | 879 | nfs_block_sillyrename(dentry); |
1cda707d | 880 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
881 | if (res < 0) |
882 | goto out; | |
883 | ||
47c716cb | 884 | do { |
1da177e4 | 885 | res = readdir_search_pagecache(desc); |
00a92642 | 886 | |
1da177e4 | 887 | if (res == -EBADCOOKIE) { |
ece0b423 | 888 | res = 0; |
1da177e4 | 889 | /* This means either end of directory */ |
d1bacf9e | 890 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
891 | /* Or that the server has 'lost' a cookie */ |
892 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 893 | if (res == 0) |
1da177e4 LT |
894 | continue; |
895 | } | |
1da177e4 LT |
896 | break; |
897 | } | |
898 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 899 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 900 | nfs_zap_caches(inode); |
baf57a09 | 901 | desc->page_index = 0; |
1da177e4 | 902 | desc->plus = 0; |
d1bacf9e | 903 | desc->eof = 0; |
1da177e4 LT |
904 | continue; |
905 | } | |
906 | if (res < 0) | |
907 | break; | |
908 | ||
909 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 910 | if (res < 0) |
1da177e4 | 911 | break; |
47c716cb | 912 | } while (!desc->eof); |
fccca7fc | 913 | out: |
565277f6 | 914 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
915 | if (res > 0) |
916 | res = 0; | |
aa49b4cf | 917 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
918 | dentry->d_parent->d_name.name, dentry->d_name.name, |
919 | res); | |
920 | return res; | |
1da177e4 LT |
921 | } |
922 | ||
10afec90 | 923 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 924 | { |
b84e06c5 CL |
925 | struct dentry *dentry = filp->f_path.dentry; |
926 | struct inode *inode = dentry->d_inode; | |
480c2006 | 927 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 928 | |
6da24bc9 | 929 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
930 | dentry->d_parent->d_name.name, |
931 | dentry->d_name.name, | |
932 | offset, origin); | |
933 | ||
934 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
935 | switch (origin) { |
936 | case 1: | |
937 | offset += filp->f_pos; | |
938 | case 0: | |
939 | if (offset >= 0) | |
940 | break; | |
941 | default: | |
942 | offset = -EINVAL; | |
943 | goto out; | |
944 | } | |
945 | if (offset != filp->f_pos) { | |
946 | filp->f_pos = offset; | |
480c2006 | 947 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 948 | dir_ctx->duped = 0; |
f0dd2136 TM |
949 | } |
950 | out: | |
b84e06c5 | 951 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
952 | return offset; |
953 | } | |
954 | ||
1da177e4 LT |
955 | /* |
956 | * All directory operations under NFS are synchronous, so fsync() | |
957 | * is a dummy operation. | |
958 | */ | |
02c24a82 JB |
959 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
960 | int datasync) | |
1da177e4 | 961 | { |
7ea80859 | 962 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 963 | struct inode *inode = dentry->d_inode; |
7ea80859 | 964 | |
6da24bc9 | 965 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
966 | dentry->d_parent->d_name.name, dentry->d_name.name, |
967 | datasync); | |
968 | ||
02c24a82 | 969 | mutex_lock(&inode->i_mutex); |
54917786 | 970 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 971 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
972 | return 0; |
973 | } | |
974 | ||
bfc69a45 TM |
975 | /** |
976 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
977 | * @dir - pointer to directory inode | |
978 | * | |
979 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
980 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
981 | * on the server that might have invalidated our dcache. | |
982 | * | |
983 | * The caller should be holding dir->i_lock | |
984 | */ | |
985 | void nfs_force_lookup_revalidate(struct inode *dir) | |
986 | { | |
011935a0 | 987 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
988 | } |
989 | ||
1da177e4 LT |
990 | /* |
991 | * A check for whether or not the parent directory has changed. | |
992 | * In the case it has, we assume that the dentries are untrustworthy | |
993 | * and may need to be looked up again. | |
994 | */ | |
c79ba787 | 995 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
996 | { |
997 | if (IS_ROOT(dentry)) | |
998 | return 1; | |
4eec952e TM |
999 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1000 | return 0; | |
f2c77f4e TM |
1001 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1002 | return 0; | |
1003 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1004 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1005 | return 0; | |
1006 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
1007 | return 0; | |
1008 | return 1; | |
1da177e4 LT |
1009 | } |
1010 | ||
1d6757fb TM |
1011 | /* |
1012 | * Return the intent data that applies to this particular path component | |
1013 | * | |
1014 | * Note that the current set of intents only apply to the very last | |
8aeb376c AV |
1015 | * component of the path and none of them is set before that last |
1016 | * component. | |
1d6757fb | 1017 | */ |
34286d66 NP |
1018 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, |
1019 | unsigned int mask) | |
1d6757fb | 1020 | { |
1d6757fb TM |
1021 | return nd->flags & mask; |
1022 | } | |
1023 | ||
a12802ca TM |
1024 | /* |
1025 | * Use intent information to check whether or not we're going to do | |
1026 | * an O_EXCL create using this path component. | |
1027 | */ | |
1028 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
1029 | { | |
1030 | if (NFS_PROTO(dir)->version == 2) | |
1031 | return 0; | |
3516586a | 1032 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
1033 | } |
1034 | ||
1d6757fb TM |
1035 | /* |
1036 | * Inode and filehandle revalidation for lookups. | |
1037 | * | |
1038 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1039 | * or if the intent information indicates that we're about to open this | |
1040 | * particular file and the "nocto" mount flag is not set. | |
1041 | * | |
1042 | */ | |
1da177e4 LT |
1043 | static inline |
1044 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
1045 | { | |
1046 | struct nfs_server *server = NFS_SERVER(inode); | |
1047 | ||
36d43a43 | 1048 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1049 | return 0; |
1da177e4 | 1050 | if (nd != NULL) { |
1da177e4 | 1051 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 1052 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
1053 | goto out_force; |
1054 | /* This is an open(2) */ | |
1d6757fb | 1055 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
1056 | !(server->flags & NFS_MOUNT_NOCTO) && |
1057 | (S_ISREG(inode->i_mode) || | |
1058 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 1059 | goto out_force; |
4f48af45 | 1060 | return 0; |
1da177e4 LT |
1061 | } |
1062 | return nfs_revalidate_inode(server, inode); | |
1063 | out_force: | |
1064 | return __nfs_revalidate_inode(server, inode); | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * We judge how long we want to trust negative | |
1069 | * dentries by looking at the parent inode mtime. | |
1070 | * | |
1071 | * If parent mtime has changed, we revalidate, else we wait for a | |
1072 | * period corresponding to the parent's attribute cache timeout value. | |
1073 | */ | |
1074 | static inline | |
1075 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
1076 | struct nameidata *nd) | |
1077 | { | |
1da177e4 | 1078 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 1079 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1080 | return 0; |
4eec952e TM |
1081 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1082 | return 1; | |
1da177e4 LT |
1083 | return !nfs_check_verifier(dir, dentry); |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * This is called every time the dcache has a lookup hit, | |
1088 | * and we should check whether we can really trust that | |
1089 | * lookup. | |
1090 | * | |
1091 | * NOTE! The hit can be a negative hit too, don't assume | |
1092 | * we have an inode! | |
1093 | * | |
1094 | * If the parent directory is seen to have changed, we throw out the | |
1095 | * cached dentry and do a new lookup. | |
1096 | */ | |
34286d66 | 1097 | static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1098 | { |
1099 | struct inode *dir; | |
1100 | struct inode *inode; | |
1101 | struct dentry *parent; | |
e1fb4d05 TM |
1102 | struct nfs_fh *fhandle = NULL; |
1103 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1104 | int error; |
1da177e4 | 1105 | |
34286d66 NP |
1106 | if (nd->flags & LOOKUP_RCU) |
1107 | return -ECHILD; | |
1108 | ||
1da177e4 | 1109 | parent = dget_parent(dentry); |
1da177e4 | 1110 | dir = parent->d_inode; |
91d5b470 | 1111 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1112 | inode = dentry->d_inode; |
1113 | ||
1114 | if (!inode) { | |
1115 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1116 | goto out_bad; | |
1117 | goto out_valid; | |
1118 | } | |
1119 | ||
1120 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1121 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1122 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1123 | dentry->d_name.name); |
1da177e4 LT |
1124 | goto out_bad; |
1125 | } | |
1126 | ||
15860ab1 TM |
1127 | if (nfs_have_delegation(inode, FMODE_READ)) |
1128 | goto out_set_verifier; | |
1129 | ||
1da177e4 | 1130 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1131 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1132 | if (nfs_lookup_verify_inode(inode, nd)) |
1133 | goto out_zap_parent; | |
1134 | goto out_valid; | |
1135 | } | |
1136 | ||
1137 | if (NFS_STALE(inode)) | |
1138 | goto out_bad; | |
1139 | ||
e1fb4d05 TM |
1140 | error = -ENOMEM; |
1141 | fhandle = nfs_alloc_fhandle(); | |
1142 | fattr = nfs_alloc_fattr(); | |
1143 | if (fhandle == NULL || fattr == NULL) | |
1144 | goto out_error; | |
1145 | ||
7c513058 | 1146 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1147 | if (error) |
1148 | goto out_bad; | |
e1fb4d05 | 1149 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1150 | goto out_bad; |
e1fb4d05 | 1151 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1152 | goto out_bad; |
1153 | ||
e1fb4d05 TM |
1154 | nfs_free_fattr(fattr); |
1155 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1156 | out_set_verifier: |
cf8ba45e | 1157 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1158 | out_valid: |
1da177e4 | 1159 | dput(parent); |
1e7cb3dc | 1160 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1161 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1162 | dentry->d_name.name); |
1da177e4 LT |
1163 | return 1; |
1164 | out_zap_parent: | |
1165 | nfs_zap_caches(dir); | |
1166 | out_bad: | |
a1643a92 | 1167 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1168 | if (inode && S_ISDIR(inode->i_mode)) { |
1169 | /* Purge readdir caches. */ | |
1170 | nfs_zap_caches(inode); | |
1171 | /* If we have submounts, don't unhash ! */ | |
1172 | if (have_submounts(dentry)) | |
1173 | goto out_valid; | |
d9e80b7d AV |
1174 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1175 | goto out_valid; | |
1da177e4 LT |
1176 | shrink_dcache_parent(dentry); |
1177 | } | |
1178 | d_drop(dentry); | |
e1fb4d05 TM |
1179 | nfs_free_fattr(fattr); |
1180 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1181 | dput(parent); |
1e7cb3dc | 1182 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1183 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1184 | dentry->d_name.name); |
1da177e4 | 1185 | return 0; |
e1fb4d05 TM |
1186 | out_error: |
1187 | nfs_free_fattr(fattr); | |
1188 | nfs_free_fhandle(fhandle); | |
1189 | dput(parent); | |
1190 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1191 | __func__, dentry->d_parent->d_name.name, | |
1192 | dentry->d_name.name, error); | |
1193 | return error; | |
1da177e4 LT |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * This is called from dput() when d_count is going to 0. | |
1198 | */ | |
fe15ce44 | 1199 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1200 | { |
1201 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1202 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1203 | dentry->d_flags); | |
1204 | ||
77f11192 TM |
1205 | /* Unhash any dentry with a stale inode */ |
1206 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1207 | return 1; | |
1208 | ||
1da177e4 LT |
1209 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1210 | /* Unhash it, so that ->d_iput() would be called */ | |
1211 | return 1; | |
1212 | } | |
1213 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1214 | /* Unhash it, so that ancestors of killed async unlink | |
1215 | * files will be cleaned up during umount */ | |
1216 | return 1; | |
1217 | } | |
1218 | return 0; | |
1219 | ||
1220 | } | |
1221 | ||
1b83d707 TM |
1222 | static void nfs_drop_nlink(struct inode *inode) |
1223 | { | |
1224 | spin_lock(&inode->i_lock); | |
1225 | if (inode->i_nlink > 0) | |
1226 | drop_nlink(inode); | |
1227 | spin_unlock(&inode->i_lock); | |
1228 | } | |
1229 | ||
1da177e4 LT |
1230 | /* |
1231 | * Called when the dentry loses inode. | |
1232 | * We use it to clean up silly-renamed files. | |
1233 | */ | |
1234 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1235 | { | |
83672d39 NB |
1236 | if (S_ISDIR(inode->i_mode)) |
1237 | /* drop any readdir cache as it could easily be old */ | |
1238 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1239 | ||
1da177e4 | 1240 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1241 | drop_nlink(inode); |
e4eff1a6 | 1242 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1243 | } |
1da177e4 LT |
1244 | iput(inode); |
1245 | } | |
1246 | ||
b1942c5f AV |
1247 | static void nfs_d_release(struct dentry *dentry) |
1248 | { | |
1249 | /* free cached devname value, if it survived that far */ | |
1250 | if (unlikely(dentry->d_fsdata)) { | |
1251 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1252 | WARN_ON(1); | |
1253 | else | |
1254 | kfree(dentry->d_fsdata); | |
1255 | } | |
1256 | } | |
1257 | ||
f786aa90 | 1258 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1259 | .d_revalidate = nfs_lookup_revalidate, |
1260 | .d_delete = nfs_dentry_delete, | |
1261 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1262 | .d_automount = nfs_d_automount, |
b1942c5f | 1263 | .d_release = nfs_d_release, |
1da177e4 LT |
1264 | }; |
1265 | ||
1da177e4 LT |
1266 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1267 | { | |
1268 | struct dentry *res; | |
565277f6 | 1269 | struct dentry *parent; |
1da177e4 | 1270 | struct inode *inode = NULL; |
e1fb4d05 TM |
1271 | struct nfs_fh *fhandle = NULL; |
1272 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1273 | int error; |
1da177e4 LT |
1274 | |
1275 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1276 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1277 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1278 | |
1279 | res = ERR_PTR(-ENAMETOOLONG); | |
1280 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1281 | goto out; | |
1282 | ||
fd684071 TM |
1283 | /* |
1284 | * If we're doing an exclusive create, optimize away the lookup | |
1285 | * but don't hash the dentry. | |
1286 | */ | |
1287 | if (nfs_is_exclusive_create(dir, nd)) { | |
1288 | d_instantiate(dentry, NULL); | |
1289 | res = NULL; | |
fc0f684c | 1290 | goto out; |
fd684071 | 1291 | } |
1da177e4 | 1292 | |
e1fb4d05 TM |
1293 | res = ERR_PTR(-ENOMEM); |
1294 | fhandle = nfs_alloc_fhandle(); | |
1295 | fattr = nfs_alloc_fattr(); | |
1296 | if (fhandle == NULL || fattr == NULL) | |
1297 | goto out; | |
1298 | ||
565277f6 TM |
1299 | parent = dentry->d_parent; |
1300 | /* Protect against concurrent sillydeletes */ | |
1301 | nfs_block_sillyrename(parent); | |
7c513058 | 1302 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1303 | if (error == -ENOENT) |
1304 | goto no_entry; | |
1305 | if (error < 0) { | |
1306 | res = ERR_PTR(error); | |
565277f6 | 1307 | goto out_unblock_sillyrename; |
1da177e4 | 1308 | } |
e1fb4d05 | 1309 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1310 | res = ERR_CAST(inode); |
03f28e3a | 1311 | if (IS_ERR(res)) |
565277f6 | 1312 | goto out_unblock_sillyrename; |
54ceac45 | 1313 | |
1da177e4 | 1314 | no_entry: |
54ceac45 | 1315 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1316 | if (res != NULL) { |
1317 | if (IS_ERR(res)) | |
565277f6 | 1318 | goto out_unblock_sillyrename; |
1da177e4 | 1319 | dentry = res; |
9eaef27b | 1320 | } |
1da177e4 | 1321 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1322 | out_unblock_sillyrename: |
1323 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1324 | out: |
e1fb4d05 TM |
1325 | nfs_free_fattr(fattr); |
1326 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1327 | return res; |
1328 | } | |
1329 | ||
1330 | #ifdef CONFIG_NFS_V4 | |
1331 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1332 | ||
f786aa90 | 1333 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1334 | .d_revalidate = nfs_open_revalidate, |
1335 | .d_delete = nfs_dentry_delete, | |
1336 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1337 | .d_automount = nfs_d_automount, |
b1942c5f | 1338 | .d_release = nfs_d_release, |
1da177e4 LT |
1339 | }; |
1340 | ||
1d6757fb TM |
1341 | /* |
1342 | * Use intent information to determine whether we need to substitute | |
1343 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1344 | */ | |
5584c306 | 1345 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1346 | { |
1d6757fb | 1347 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1348 | return 0; |
1349 | /* NFS does not (yet) have a stateful open for directories */ | |
1350 | if (nd->flags & LOOKUP_DIRECTORY) | |
1351 | return 0; | |
1352 | /* Are we trying to write to a read only partition? */ | |
2c463e95 | 1353 | if (__mnt_is_readonly(nd->path.mnt) && |
8a5e929d | 1354 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|O_ACCMODE))) |
1da177e4 LT |
1355 | return 0; |
1356 | return 1; | |
1357 | } | |
1358 | ||
8a5e929d AV |
1359 | static fmode_t flags_to_mode(int flags) |
1360 | { | |
1361 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1362 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1363 | res |= FMODE_READ; | |
1364 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1365 | res |= FMODE_WRITE; | |
1366 | return res; | |
1367 | } | |
1368 | ||
51141598 | 1369 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1370 | { |
5ede7b1c | 1371 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1372 | } |
1373 | ||
1374 | static int do_open(struct inode *inode, struct file *filp) | |
1375 | { | |
1376 | nfs_fscache_set_inode_cookie(inode, filp); | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1381 | { | |
1382 | struct file *filp; | |
1383 | int ret = 0; | |
1384 | ||
1385 | /* If the open_intent is for execute, we have an extra check to make */ | |
1386 | if (ctx->mode & FMODE_EXEC) { | |
3d4ff43d | 1387 | ret = nfs_may_open(ctx->dentry->d_inode, |
cd9a1c0e TM |
1388 | ctx->cred, |
1389 | nd->intent.open.flags); | |
1390 | if (ret < 0) | |
1391 | goto out; | |
1392 | } | |
3d4ff43d | 1393 | filp = lookup_instantiate_filp(nd, ctx->dentry, do_open); |
cd9a1c0e TM |
1394 | if (IS_ERR(filp)) |
1395 | ret = PTR_ERR(filp); | |
1396 | else | |
1397 | nfs_file_set_open_context(filp, ctx); | |
1398 | out: | |
1399 | put_nfs_open_context(ctx); | |
1400 | return ret; | |
1401 | } | |
1402 | ||
1da177e4 LT |
1403 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1404 | { | |
cd9a1c0e TM |
1405 | struct nfs_open_context *ctx; |
1406 | struct iattr attr; | |
1da177e4 | 1407 | struct dentry *res = NULL; |
f46e0bd3 | 1408 | struct inode *inode; |
cd9a1c0e | 1409 | int open_flags; |
898f635c | 1410 | int err; |
1da177e4 | 1411 | |
1e7cb3dc CL |
1412 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1413 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1414 | ||
1da177e4 | 1415 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1416 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1417 | goto no_open; |
1418 | ||
1419 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1420 | res = ERR_PTR(-ENAMETOOLONG); | |
1421 | goto out; | |
1422 | } | |
1da177e4 | 1423 | |
d4d9cdcb TM |
1424 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1425 | * the dentry. */ | |
3516586a | 1426 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1427 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1428 | goto out; |
1429 | } | |
1da177e4 | 1430 | |
51141598 | 1431 | open_flags = nd->intent.open.flags; |
536e43d1 | 1432 | attr.ia_valid = 0; |
51141598 AV |
1433 | |
1434 | ctx = create_nfs_open_context(dentry, open_flags); | |
cd9a1c0e TM |
1435 | res = ERR_CAST(ctx); |
1436 | if (IS_ERR(ctx)) | |
1437 | goto out; | |
1438 | ||
cd9a1c0e TM |
1439 | if (nd->flags & LOOKUP_CREATE) { |
1440 | attr.ia_mode = nd->intent.open.create_mode; | |
536e43d1 | 1441 | attr.ia_valid |= ATTR_MODE; |
a8a5da99 | 1442 | attr.ia_mode &= ~current_umask(); |
536e43d1 | 1443 | } else |
898f635c | 1444 | open_flags &= ~(O_EXCL | O_CREAT); |
536e43d1 TM |
1445 | |
1446 | if (open_flags & O_TRUNC) { | |
1447 | attr.ia_valid |= ATTR_SIZE; | |
1448 | attr.ia_size = 0; | |
cd9a1c0e TM |
1449 | } |
1450 | ||
1da177e4 | 1451 | /* Open the file on the server */ |
f46e0bd3 | 1452 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1453 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1454 | if (IS_ERR(inode)) { |
1455 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1456 | put_nfs_open_context(ctx); |
f46e0bd3 | 1457 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1458 | /* Make a negative dentry */ |
1459 | case -ENOENT: | |
f46e0bd3 | 1460 | d_add(dentry, NULL); |
02a913a7 TM |
1461 | res = NULL; |
1462 | goto out; | |
1da177e4 | 1463 | /* This turned out not to be a regular file */ |
1788ea6e | 1464 | case -EISDIR: |
6f926b5b TM |
1465 | case -ENOTDIR: |
1466 | goto no_open; | |
1da177e4 LT |
1467 | case -ELOOP: |
1468 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1469 | goto no_open; | |
1da177e4 LT |
1470 | /* case -EINVAL: */ |
1471 | default: | |
f46e0bd3 | 1472 | res = ERR_CAST(inode); |
1da177e4 LT |
1473 | goto out; |
1474 | } | |
cd9a1c0e | 1475 | } |
f46e0bd3 | 1476 | res = d_add_unique(dentry, inode); |
898f635c | 1477 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1478 | if (res != NULL) { |
3d4ff43d AV |
1479 | dput(ctx->dentry); |
1480 | ctx->dentry = dget(res); | |
1da177e4 | 1481 | dentry = res; |
f46e0bd3 | 1482 | } |
898f635c TM |
1483 | err = nfs_intent_set_file(nd, ctx); |
1484 | if (err < 0) { | |
1485 | if (res != NULL) | |
1486 | dput(res); | |
1487 | return ERR_PTR(err); | |
1488 | } | |
1da177e4 | 1489 | out: |
f46e0bd3 | 1490 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1491 | return res; |
1492 | no_open: | |
1493 | return nfs_lookup(dir, dentry, nd); | |
1494 | } | |
1495 | ||
1496 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1497 | { | |
1498 | struct dentry *parent = NULL; | |
657e94b6 | 1499 | struct inode *inode; |
1da177e4 | 1500 | struct inode *dir; |
b8d4cadd | 1501 | struct nfs_open_context *ctx; |
536e43d1 | 1502 | struct iattr attr; |
1da177e4 LT |
1503 | int openflags, ret = 0; |
1504 | ||
657e94b6 NP |
1505 | if (nd->flags & LOOKUP_RCU) |
1506 | return -ECHILD; | |
1507 | ||
1508 | inode = dentry->d_inode; | |
1f063d2c | 1509 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1510 | goto no_open; |
2b484297 | 1511 | |
1da177e4 LT |
1512 | parent = dget_parent(dentry); |
1513 | dir = parent->d_inode; | |
2b484297 | 1514 | |
1da177e4 LT |
1515 | /* We can't create new files in nfs_open_revalidate(), so we |
1516 | * optimize away revalidation of negative dentries. | |
1517 | */ | |
216d5d06 TM |
1518 | if (inode == NULL) { |
1519 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1520 | ret = 1; | |
1da177e4 | 1521 | goto out; |
216d5d06 TM |
1522 | } |
1523 | ||
1da177e4 LT |
1524 | /* NFS only supports OPEN on regular files */ |
1525 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1526 | goto no_open_dput; |
1da177e4 LT |
1527 | openflags = nd->intent.open.flags; |
1528 | /* We cannot do exclusive creation on a positive dentry */ | |
1529 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1530 | goto no_open_dput; |
536e43d1 TM |
1531 | /* We can't create new files here */ |
1532 | openflags &= ~(O_CREAT|O_EXCL); | |
1da177e4 | 1533 | |
51141598 | 1534 | ctx = create_nfs_open_context(dentry, openflags); |
b8d4cadd TM |
1535 | ret = PTR_ERR(ctx); |
1536 | if (IS_ERR(ctx)) | |
1537 | goto out; | |
536e43d1 TM |
1538 | |
1539 | attr.ia_valid = 0; | |
1540 | if (openflags & O_TRUNC) { | |
1541 | attr.ia_valid |= ATTR_SIZE; | |
1542 | attr.ia_size = 0; | |
1543 | nfs_wb_all(inode); | |
1544 | } | |
1545 | ||
1da177e4 | 1546 | /* |
1b1dcc1b | 1547 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1548 | * operations that change the directory. We therefore save the |
1549 | * change attribute *before* we do the RPC call. | |
1550 | */ | |
536e43d1 | 1551 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr); |
535918f1 TM |
1552 | if (IS_ERR(inode)) { |
1553 | ret = PTR_ERR(inode); | |
1554 | switch (ret) { | |
1555 | case -EPERM: | |
1556 | case -EACCES: | |
1557 | case -EDQUOT: | |
1558 | case -ENOSPC: | |
1559 | case -EROFS: | |
1560 | goto out_put_ctx; | |
1561 | default: | |
1562 | goto out_drop; | |
1563 | } | |
1564 | } | |
1565 | iput(inode); | |
898f635c | 1566 | if (inode != dentry->d_inode) |
535918f1 | 1567 | goto out_drop; |
898f635c TM |
1568 | |
1569 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1570 | ret = nfs_intent_set_file(nd, ctx); | |
1571 | if (ret >= 0) | |
1572 | ret = 1; | |
1da177e4 LT |
1573 | out: |
1574 | dput(parent); | |
1da177e4 | 1575 | return ret; |
535918f1 TM |
1576 | out_drop: |
1577 | d_drop(dentry); | |
1578 | ret = 0; | |
1579 | out_put_ctx: | |
1580 | put_nfs_open_context(ctx); | |
1581 | goto out; | |
1582 | ||
5584c306 | 1583 | no_open_dput: |
1da177e4 | 1584 | dput(parent); |
5584c306 | 1585 | no_open: |
1da177e4 LT |
1586 | return nfs_lookup_revalidate(dentry, nd); |
1587 | } | |
c0204fd2 | 1588 | |
4acdaf27 AV |
1589 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, |
1590 | umode_t mode, struct nameidata *nd) | |
c0204fd2 TM |
1591 | { |
1592 | struct nfs_open_context *ctx = NULL; | |
1593 | struct iattr attr; | |
1594 | int error; | |
8a5e929d | 1595 | int open_flags = O_CREAT|O_EXCL; |
c0204fd2 TM |
1596 | |
1597 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1598 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1599 | ||
1600 | attr.ia_mode = mode; | |
1601 | attr.ia_valid = ATTR_MODE; | |
1602 | ||
dd7dd556 | 1603 | if (nd) |
c0204fd2 TM |
1604 | open_flags = nd->intent.open.flags; |
1605 | ||
f7c85868 AV |
1606 | ctx = create_nfs_open_context(dentry, open_flags); |
1607 | error = PTR_ERR(ctx); | |
1608 | if (IS_ERR(ctx)) | |
1609 | goto out_err_drop; | |
c0204fd2 TM |
1610 | |
1611 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1612 | if (error != 0) | |
1613 | goto out_put_ctx; | |
dd7dd556 | 1614 | if (nd) { |
898f635c TM |
1615 | error = nfs_intent_set_file(nd, ctx); |
1616 | if (error < 0) | |
1617 | goto out_err; | |
f7c85868 AV |
1618 | } else { |
1619 | put_nfs_open_context(ctx); | |
898f635c | 1620 | } |
c0204fd2 TM |
1621 | return 0; |
1622 | out_put_ctx: | |
f7c85868 | 1623 | put_nfs_open_context(ctx); |
898f635c | 1624 | out_err_drop: |
c0204fd2 | 1625 | d_drop(dentry); |
898f635c | 1626 | out_err: |
c0204fd2 TM |
1627 | return error; |
1628 | } | |
1629 | ||
1da177e4 LT |
1630 | #endif /* CONFIG_NFSV4 */ |
1631 | ||
1da177e4 LT |
1632 | /* |
1633 | * Code common to create, mkdir, and mknod. | |
1634 | */ | |
1635 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1636 | struct nfs_fattr *fattr) | |
1637 | { | |
fab728e1 TM |
1638 | struct dentry *parent = dget_parent(dentry); |
1639 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1640 | struct inode *inode; |
1641 | int error = -EACCES; | |
1642 | ||
fab728e1 TM |
1643 | d_drop(dentry); |
1644 | ||
1da177e4 LT |
1645 | /* We may have been initialized further down */ |
1646 | if (dentry->d_inode) | |
fab728e1 | 1647 | goto out; |
1da177e4 | 1648 | if (fhandle->size == 0) { |
7c513058 | 1649 | error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1650 | if (error) |
fab728e1 | 1651 | goto out_error; |
1da177e4 | 1652 | } |
5724ab37 | 1653 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1654 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1655 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1656 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1657 | if (error < 0) |
fab728e1 | 1658 | goto out_error; |
1da177e4 | 1659 | } |
1da177e4 | 1660 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1661 | error = PTR_ERR(inode); |
1662 | if (IS_ERR(inode)) | |
fab728e1 TM |
1663 | goto out_error; |
1664 | d_add(dentry, inode); | |
1665 | out: | |
1666 | dput(parent); | |
1da177e4 | 1667 | return 0; |
fab728e1 TM |
1668 | out_error: |
1669 | nfs_mark_for_revalidate(dir); | |
1670 | dput(parent); | |
1671 | return error; | |
1da177e4 LT |
1672 | } |
1673 | ||
1674 | /* | |
1675 | * Following a failed create operation, we drop the dentry rather | |
1676 | * than retain a negative dentry. This avoids a problem in the event | |
1677 | * that the operation succeeded on the server, but an error in the | |
1678 | * reply path made it appear to have failed. | |
1679 | */ | |
4acdaf27 AV |
1680 | static int nfs_create(struct inode *dir, struct dentry *dentry, |
1681 | umode_t mode, struct nameidata *nd) | |
1da177e4 LT |
1682 | { |
1683 | struct iattr attr; | |
1684 | int error; | |
8a5e929d | 1685 | int open_flags = O_CREAT|O_EXCL; |
1da177e4 | 1686 | |
1e7cb3dc CL |
1687 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1688 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1689 | |
1690 | attr.ia_mode = mode; | |
1691 | attr.ia_valid = ATTR_MODE; | |
1692 | ||
dd7dd556 | 1693 | if (nd) |
8a0eebf6 TM |
1694 | open_flags = nd->intent.open.flags; |
1695 | ||
1696 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL); | |
1da177e4 LT |
1697 | if (error != 0) |
1698 | goto out_err; | |
1da177e4 LT |
1699 | return 0; |
1700 | out_err: | |
1da177e4 LT |
1701 | d_drop(dentry); |
1702 | return error; | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * See comments for nfs_proc_create regarding failed operations. | |
1707 | */ | |
1708 | static int | |
1a67aafb | 1709 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1710 | { |
1711 | struct iattr attr; | |
1712 | int status; | |
1713 | ||
1e7cb3dc CL |
1714 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1715 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1716 | |
1717 | if (!new_valid_dev(rdev)) | |
1718 | return -EINVAL; | |
1719 | ||
1720 | attr.ia_mode = mode; | |
1721 | attr.ia_valid = ATTR_MODE; | |
1722 | ||
1da177e4 | 1723 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1724 | if (status != 0) |
1725 | goto out_err; | |
1da177e4 LT |
1726 | return 0; |
1727 | out_err: | |
1da177e4 LT |
1728 | d_drop(dentry); |
1729 | return status; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * See comments for nfs_proc_create regarding failed operations. | |
1734 | */ | |
18bb1db3 | 1735 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1736 | { |
1737 | struct iattr attr; | |
1738 | int error; | |
1739 | ||
1e7cb3dc CL |
1740 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1741 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1742 | |
1743 | attr.ia_valid = ATTR_MODE; | |
1744 | attr.ia_mode = mode | S_IFDIR; | |
1745 | ||
1da177e4 | 1746 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1747 | if (error != 0) |
1748 | goto out_err; | |
1da177e4 LT |
1749 | return 0; |
1750 | out_err: | |
1751 | d_drop(dentry); | |
1da177e4 LT |
1752 | return error; |
1753 | } | |
1754 | ||
d45b9d8b TM |
1755 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1756 | { | |
1757 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1758 | d_delete(dentry); | |
1759 | } | |
1760 | ||
1da177e4 LT |
1761 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1762 | { | |
1763 | int error; | |
1764 | ||
1e7cb3dc CL |
1765 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1766 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1767 | |
1da177e4 LT |
1768 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1769 | /* Ensure the VFS deletes this inode */ | |
1770 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1771 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1772 | else if (error == -ENOENT) |
1773 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1774 | |
1775 | return error; | |
1776 | } | |
1777 | ||
1da177e4 LT |
1778 | /* |
1779 | * Remove a file after making sure there are no pending writes, | |
1780 | * and after checking that the file has only one user. | |
1781 | * | |
1782 | * We invalidate the attribute cache and free the inode prior to the operation | |
1783 | * to avoid possible races if the server reuses the inode. | |
1784 | */ | |
1785 | static int nfs_safe_remove(struct dentry *dentry) | |
1786 | { | |
1787 | struct inode *dir = dentry->d_parent->d_inode; | |
1788 | struct inode *inode = dentry->d_inode; | |
1789 | int error = -EBUSY; | |
1790 | ||
1791 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1792 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1793 | ||
1794 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1795 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1796 | error = 0; | |
1797 | goto out; | |
1798 | } | |
1799 | ||
1da177e4 | 1800 | if (inode != NULL) { |
cae7a073 | 1801 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1802 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1803 | /* The VFS may want to delete this inode */ | |
1804 | if (error == 0) | |
1b83d707 | 1805 | nfs_drop_nlink(inode); |
5ba7cc48 | 1806 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1807 | } else |
1808 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1809 | if (error == -ENOENT) |
1810 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1811 | out: |
1812 | return error; | |
1813 | } | |
1814 | ||
1815 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1816 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1817 | * | |
1818 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1819 | */ | |
1820 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1821 | { | |
1822 | int error; | |
1823 | int need_rehash = 0; | |
1824 | ||
1825 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1826 | dir->i_ino, dentry->d_name.name); | |
1827 | ||
1da177e4 | 1828 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1829 | if (dentry->d_count > 1) { |
1da177e4 | 1830 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1831 | /* Start asynchronous writeout of the inode */ |
1832 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1833 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1834 | return error; |
1835 | } | |
1836 | if (!d_unhashed(dentry)) { | |
1837 | __d_drop(dentry); | |
1838 | need_rehash = 1; | |
1839 | } | |
1840 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1841 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1842 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1843 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1844 | } else if (need_rehash) | |
1845 | d_rehash(dentry); | |
1da177e4 LT |
1846 | return error; |
1847 | } | |
1848 | ||
873101b3 CL |
1849 | /* |
1850 | * To create a symbolic link, most file systems instantiate a new inode, | |
1851 | * add a page to it containing the path, then write it out to the disk | |
1852 | * using prepare_write/commit_write. | |
1853 | * | |
1854 | * Unfortunately the NFS client can't create the in-core inode first | |
1855 | * because it needs a file handle to create an in-core inode (see | |
1856 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1857 | * symlink request has completed on the server. | |
1858 | * | |
1859 | * So instead we allocate a raw page, copy the symname into it, then do | |
1860 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1861 | * now have a new file handle and can instantiate an in-core NFS inode | |
1862 | * and move the raw page into its mapping. | |
1863 | */ | |
1864 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1865 | { |
873101b3 CL |
1866 | struct pagevec lru_pvec; |
1867 | struct page *page; | |
1868 | char *kaddr; | |
1da177e4 | 1869 | struct iattr attr; |
873101b3 | 1870 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1871 | int error; |
1872 | ||
1873 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1874 | dir->i_ino, dentry->d_name.name, symname); | |
1875 | ||
873101b3 CL |
1876 | if (pathlen > PAGE_SIZE) |
1877 | return -ENAMETOOLONG; | |
1da177e4 | 1878 | |
873101b3 CL |
1879 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1880 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1881 | |
83d93f22 | 1882 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1883 | if (!page) |
873101b3 | 1884 | return -ENOMEM; |
873101b3 CL |
1885 | |
1886 | kaddr = kmap_atomic(page, KM_USER0); | |
1887 | memcpy(kaddr, symname, pathlen); | |
1888 | if (pathlen < PAGE_SIZE) | |
1889 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
1890 | kunmap_atomic(kaddr, KM_USER0); | |
1891 | ||
94a6d753 | 1892 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1893 | if (error != 0) { |
1894 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1895 | dir->i_sb->s_id, dir->i_ino, | |
1896 | dentry->d_name.name, symname, error); | |
1da177e4 | 1897 | d_drop(dentry); |
873101b3 | 1898 | __free_page(page); |
873101b3 CL |
1899 | return error; |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * No big deal if we can't add this page to the page cache here. | |
1904 | * READLINK will get the missing page from the server if needed. | |
1905 | */ | |
1906 | pagevec_init(&lru_pvec, 0); | |
1907 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1908 | GFP_KERNEL)) { | |
39cf8a13 | 1909 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1910 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1911 | SetPageUptodate(page); |
1912 | unlock_page(page); | |
1913 | } else | |
1914 | __free_page(page); | |
1915 | ||
873101b3 | 1916 | return 0; |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | static int | |
1920 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1921 | { | |
1922 | struct inode *inode = old_dentry->d_inode; | |
1923 | int error; | |
1924 | ||
1925 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1926 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1927 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1928 | ||
9a3936aa TM |
1929 | nfs_inode_return_delegation(inode); |
1930 | ||
9697d234 | 1931 | d_drop(dentry); |
1da177e4 | 1932 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1933 | if (error == 0) { |
7de9c6ee | 1934 | ihold(inode); |
9697d234 | 1935 | d_add(dentry, inode); |
cf809556 | 1936 | } |
1da177e4 LT |
1937 | return error; |
1938 | } | |
1939 | ||
1940 | /* | |
1941 | * RENAME | |
1942 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1943 | * different file handle for the same inode after a rename (e.g. when | |
1944 | * moving to a different directory). A fail-safe method to do so would | |
1945 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1946 | * rename the old file using the sillyrename stuff. This way, the original | |
1947 | * file in old_dir will go away when the last process iput()s the inode. | |
1948 | * | |
1949 | * FIXED. | |
1950 | * | |
1951 | * It actually works quite well. One needs to have the possibility for | |
1952 | * at least one ".nfs..." file in each directory the file ever gets | |
1953 | * moved or linked to which happens automagically with the new | |
1954 | * implementation that only depends on the dcache stuff instead of | |
1955 | * using the inode layer | |
1956 | * | |
1957 | * Unfortunately, things are a little more complicated than indicated | |
1958 | * above. For a cross-directory move, we want to make sure we can get | |
1959 | * rid of the old inode after the operation. This means there must be | |
1960 | * no pending writes (if it's a file), and the use count must be 1. | |
1961 | * If these conditions are met, we can drop the dentries before doing | |
1962 | * the rename. | |
1963 | */ | |
1964 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1965 | struct inode *new_dir, struct dentry *new_dentry) | |
1966 | { | |
1967 | struct inode *old_inode = old_dentry->d_inode; | |
1968 | struct inode *new_inode = new_dentry->d_inode; | |
1969 | struct dentry *dentry = NULL, *rehash = NULL; | |
1970 | int error = -EBUSY; | |
1971 | ||
1da177e4 LT |
1972 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1973 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1974 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1975 | new_dentry->d_count); |
1da177e4 LT |
1976 | |
1977 | /* | |
28f79a1a MS |
1978 | * For non-directories, check whether the target is busy and if so, |
1979 | * make a copy of the dentry and then do a silly-rename. If the | |
1980 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1981 | * the new target. | |
1da177e4 | 1982 | */ |
27226104 MS |
1983 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1984 | /* | |
1985 | * To prevent any new references to the target during the | |
1986 | * rename, we unhash the dentry in advance. | |
1987 | */ | |
1988 | if (!d_unhashed(new_dentry)) { | |
1989 | d_drop(new_dentry); | |
1990 | rehash = new_dentry; | |
1991 | } | |
1da177e4 | 1992 | |
b7ab39f6 | 1993 | if (new_dentry->d_count > 2) { |
27226104 MS |
1994 | int err; |
1995 | ||
1996 | /* copy the target dentry's name */ | |
1997 | dentry = d_alloc(new_dentry->d_parent, | |
1998 | &new_dentry->d_name); | |
1999 | if (!dentry) | |
2000 | goto out; | |
2001 | ||
2002 | /* silly-rename the existing target ... */ | |
2003 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2004 | if (err) |
27226104 | 2005 | goto out; |
24e93025 MS |
2006 | |
2007 | new_dentry = dentry; | |
56335936 | 2008 | rehash = NULL; |
24e93025 | 2009 | new_inode = NULL; |
27226104 | 2010 | } |
b1e4adf4 | 2011 | } |
1da177e4 | 2012 | |
cae7a073 | 2013 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 2014 | if (new_inode != NULL) |
24174119 | 2015 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 2016 | |
1da177e4 LT |
2017 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
2018 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 2019 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
2020 | out: |
2021 | if (rehash) | |
2022 | d_rehash(rehash); | |
2023 | if (!error) { | |
b1e4adf4 TM |
2024 | if (new_inode != NULL) |
2025 | nfs_drop_nlink(new_inode); | |
349457cc | 2026 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
2027 | nfs_set_verifier(new_dentry, |
2028 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
2029 | } else if (error == -ENOENT) |
2030 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
2031 | |
2032 | /* new dentry created? */ | |
2033 | if (dentry) | |
2034 | dput(dentry); | |
1da177e4 LT |
2035 | return error; |
2036 | } | |
2037 | ||
cfcea3e8 TM |
2038 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2039 | static LIST_HEAD(nfs_access_lru_list); | |
2040 | static atomic_long_t nfs_access_nr_entries; | |
2041 | ||
1c3c07e9 TM |
2042 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2043 | { | |
2044 | put_rpccred(entry->cred); | |
2045 | kfree(entry); | |
cfcea3e8 TM |
2046 | smp_mb__before_atomic_dec(); |
2047 | atomic_long_dec(&nfs_access_nr_entries); | |
2048 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
2049 | } |
2050 | ||
1a81bb8a TM |
2051 | static void nfs_access_free_list(struct list_head *head) |
2052 | { | |
2053 | struct nfs_access_entry *cache; | |
2054 | ||
2055 | while (!list_empty(head)) { | |
2056 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2057 | list_del(&cache->lru); | |
2058 | nfs_access_free_entry(cache); | |
2059 | } | |
2060 | } | |
2061 | ||
1495f230 YH |
2062 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
2063 | struct shrink_control *sc) | |
979df72e TM |
2064 | { |
2065 | LIST_HEAD(head); | |
aa510da5 | 2066 | struct nfs_inode *nfsi, *next; |
979df72e | 2067 | struct nfs_access_entry *cache; |
1495f230 YH |
2068 | int nr_to_scan = sc->nr_to_scan; |
2069 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 2070 | |
61d5eb29 TM |
2071 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
2072 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 2073 | |
a50f7951 | 2074 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2075 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2076 | struct inode *inode; |
2077 | ||
2078 | if (nr_to_scan-- == 0) | |
2079 | break; | |
9c7e7e23 | 2080 | inode = &nfsi->vfs_inode; |
979df72e TM |
2081 | spin_lock(&inode->i_lock); |
2082 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2083 | goto remove_lru_entry; | |
2084 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2085 | struct nfs_access_entry, lru); | |
2086 | list_move(&cache->lru, &head); | |
2087 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
2088 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
2089 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2090 | &nfs_access_lru_list); | |
2091 | else { | |
2092 | remove_lru_entry: | |
2093 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2094 | smp_mb__before_clear_bit(); |
979df72e | 2095 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2096 | smp_mb__after_clear_bit(); |
979df72e | 2097 | } |
59844a9b | 2098 | spin_unlock(&inode->i_lock); |
979df72e TM |
2099 | } |
2100 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2101 | nfs_access_free_list(&head); |
979df72e TM |
2102 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2103 | } | |
2104 | ||
1a81bb8a | 2105 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2106 | { |
1c3c07e9 | 2107 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2108 | struct rb_node *n; |
1c3c07e9 TM |
2109 | struct nfs_access_entry *entry; |
2110 | ||
2111 | /* Unhook entries from the cache */ | |
2112 | while ((n = rb_first(root_node)) != NULL) { | |
2113 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2114 | rb_erase(n, root_node); | |
1a81bb8a | 2115 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2116 | } |
2117 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2118 | } |
2119 | ||
1c3c07e9 | 2120 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2121 | { |
1a81bb8a TM |
2122 | LIST_HEAD(head); |
2123 | ||
2124 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2125 | return; | |
cfcea3e8 | 2126 | /* Remove from global LRU init */ |
1a81bb8a TM |
2127 | spin_lock(&nfs_access_lru_lock); |
2128 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2129 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2130 | |
1c3c07e9 | 2131 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2132 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2133 | spin_unlock(&inode->i_lock); | |
2134 | spin_unlock(&nfs_access_lru_lock); | |
2135 | nfs_access_free_list(&head); | |
1c3c07e9 | 2136 | } |
1da177e4 | 2137 | |
1c3c07e9 TM |
2138 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2139 | { | |
2140 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2141 | struct nfs_access_entry *entry; | |
2142 | ||
2143 | while (n != NULL) { | |
2144 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2145 | ||
2146 | if (cred < entry->cred) | |
2147 | n = n->rb_left; | |
2148 | else if (cred > entry->cred) | |
2149 | n = n->rb_right; | |
2150 | else | |
2151 | return entry; | |
1da177e4 | 2152 | } |
1c3c07e9 TM |
2153 | return NULL; |
2154 | } | |
2155 | ||
af22f94a | 2156 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2157 | { |
2158 | struct nfs_inode *nfsi = NFS_I(inode); | |
2159 | struct nfs_access_entry *cache; | |
2160 | int err = -ENOENT; | |
2161 | ||
dc59250c | 2162 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2163 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2164 | goto out_zap; | |
2165 | cache = nfs_access_search_rbtree(inode, cred); | |
2166 | if (cache == NULL) | |
2167 | goto out; | |
b4d2314b | 2168 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2169 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2170 | goto out_stale; |
2171 | res->jiffies = cache->jiffies; | |
2172 | res->cred = cache->cred; | |
2173 | res->mask = cache->mask; | |
cfcea3e8 | 2174 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2175 | err = 0; |
2176 | out: | |
2177 | spin_unlock(&inode->i_lock); | |
2178 | return err; | |
2179 | out_stale: | |
2180 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2181 | list_del(&cache->lru); |
1c3c07e9 TM |
2182 | spin_unlock(&inode->i_lock); |
2183 | nfs_access_free_entry(cache); | |
2184 | return -ENOENT; | |
2185 | out_zap: | |
1a81bb8a TM |
2186 | spin_unlock(&inode->i_lock); |
2187 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2188 | return -ENOENT; |
2189 | } | |
2190 | ||
2191 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2192 | { | |
cfcea3e8 TM |
2193 | struct nfs_inode *nfsi = NFS_I(inode); |
2194 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2195 | struct rb_node **p = &root_node->rb_node; |
2196 | struct rb_node *parent = NULL; | |
2197 | struct nfs_access_entry *entry; | |
2198 | ||
2199 | spin_lock(&inode->i_lock); | |
2200 | while (*p != NULL) { | |
2201 | parent = *p; | |
2202 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2203 | ||
2204 | if (set->cred < entry->cred) | |
2205 | p = &parent->rb_left; | |
2206 | else if (set->cred > entry->cred) | |
2207 | p = &parent->rb_right; | |
2208 | else | |
2209 | goto found; | |
2210 | } | |
2211 | rb_link_node(&set->rb_node, parent, p); | |
2212 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2213 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2214 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2215 | return; |
2216 | found: | |
2217 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2218 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2219 | list_del(&entry->lru); | |
1c3c07e9 TM |
2220 | spin_unlock(&inode->i_lock); |
2221 | nfs_access_free_entry(entry); | |
2222 | } | |
2223 | ||
af22f94a | 2224 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2225 | { |
2226 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2227 | if (cache == NULL) | |
2228 | return; | |
2229 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2230 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2231 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2232 | cache->mask = set->mask; |
1c3c07e9 TM |
2233 | |
2234 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2235 | |
2236 | /* Update accounting */ | |
2237 | smp_mb__before_atomic_inc(); | |
2238 | atomic_long_inc(&nfs_access_nr_entries); | |
2239 | smp_mb__after_atomic_inc(); | |
2240 | ||
2241 | /* Add inode to global LRU list */ | |
1a81bb8a | 2242 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2243 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2244 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2245 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2246 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2247 | spin_unlock(&nfs_access_lru_lock); |
2248 | } | |
1da177e4 LT |
2249 | } |
2250 | ||
2251 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2252 | { | |
2253 | struct nfs_access_entry cache; | |
2254 | int status; | |
2255 | ||
2256 | status = nfs_access_get_cached(inode, cred, &cache); | |
2257 | if (status == 0) | |
2258 | goto out; | |
2259 | ||
2260 | /* Be clever: ask server to check for all possible rights */ | |
2261 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2262 | cache.cred = cred; | |
2263 | cache.jiffies = jiffies; | |
2264 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2265 | if (status != 0) { |
2266 | if (status == -ESTALE) { | |
2267 | nfs_zap_caches(inode); | |
2268 | if (!S_ISDIR(inode->i_mode)) | |
2269 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2270 | } | |
1da177e4 | 2271 | return status; |
a71ee337 | 2272 | } |
1da177e4 LT |
2273 | nfs_access_add_cache(inode, &cache); |
2274 | out: | |
e6305c43 | 2275 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2276 | return 0; |
2277 | return -EACCES; | |
2278 | } | |
2279 | ||
af22f94a TM |
2280 | static int nfs_open_permission_mask(int openflags) |
2281 | { | |
2282 | int mask = 0; | |
2283 | ||
8a5e929d | 2284 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2285 | mask |= MAY_READ; |
8a5e929d | 2286 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2287 | mask |= MAY_WRITE; |
8a5e929d | 2288 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2289 | mask |= MAY_EXEC; |
2290 | return mask; | |
2291 | } | |
2292 | ||
2293 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2294 | { | |
2295 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2296 | } | |
2297 | ||
10556cb2 | 2298 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2299 | { |
2300 | struct rpc_cred *cred; | |
2301 | int res = 0; | |
2302 | ||
10556cb2 | 2303 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2304 | return -ECHILD; |
2305 | ||
91d5b470 CL |
2306 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2307 | ||
e6305c43 | 2308 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2309 | goto out; |
2310 | /* Is this sys_access() ? */ | |
9cfcac81 | 2311 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2312 | goto force_lookup; |
2313 | ||
2314 | switch (inode->i_mode & S_IFMT) { | |
2315 | case S_IFLNK: | |
2316 | goto out; | |
2317 | case S_IFREG: | |
2318 | /* NFSv4 has atomic_open... */ | |
2319 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2320 | && (mask & MAY_OPEN) |
2321 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2322 | goto out; |
2323 | break; | |
2324 | case S_IFDIR: | |
2325 | /* | |
2326 | * Optimize away all write operations, since the server | |
2327 | * will check permissions when we perform the op. | |
2328 | */ | |
2329 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2330 | goto out; | |
2331 | } | |
2332 | ||
2333 | force_lookup: | |
1da177e4 LT |
2334 | if (!NFS_PROTO(inode)->access) |
2335 | goto out_notsup; | |
2336 | ||
98a8e323 | 2337 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2338 | if (!IS_ERR(cred)) { |
2339 | res = nfs_do_access(inode, cred, mask); | |
2340 | put_rpccred(cred); | |
2341 | } else | |
2342 | res = PTR_ERR(cred); | |
1da177e4 | 2343 | out: |
f696a365 MS |
2344 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2345 | res = -EACCES; | |
2346 | ||
1e7cb3dc CL |
2347 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2348 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2349 | return res; |
2350 | out_notsup: | |
2351 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2352 | if (res == 0) | |
2830ba7f | 2353 | res = generic_permission(inode, mask); |
1e7cb3dc | 2354 | goto out; |
1da177e4 LT |
2355 | } |
2356 | ||
2357 | /* | |
2358 | * Local variables: | |
2359 | * version-control: t | |
2360 | * kept-new-versions: 5 | |
2361 | * End: | |
2362 | */ |