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 | ||
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 { | |
88b8e133 | 210 | int size; |
d1bacf9e BS |
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 | |
2b86ce2d | 263 | array = kmap_atomic(page); |
d1bacf9e BS |
264 | for (i = 0; i < array->size; i++) |
265 | kfree(array->array[i].string.name); | |
2b86ce2d | 266 | kunmap_atomic(array); |
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 | ||
d69ee9b8 TM |
477 | static |
478 | bool nfs_use_readdirplus(struct inode *dir, struct file *filp) | |
479 | { | |
480 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
481 | return false; | |
482 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
483 | return true; | |
484 | if (filp->f_pos == 0) | |
485 | return true; | |
486 | return false; | |
487 | } | |
488 | ||
489 | /* | |
490 | * This function is called by the lookup code to request the use of | |
491 | * readdirplus to accelerate any future lookups in the same | |
492 | * directory. | |
493 | */ | |
494 | static | |
495 | void nfs_advise_use_readdirplus(struct inode *dir) | |
496 | { | |
497 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
498 | } | |
499 | ||
d39ab9de BS |
500 | static |
501 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
502 | { | |
4a201d6e TM |
503 | struct qstr filename = { |
504 | .len = entry->len, | |
505 | .name = entry->name, | |
506 | }; | |
507 | struct dentry *dentry; | |
508 | struct dentry *alias; | |
d39ab9de BS |
509 | struct inode *dir = parent->d_inode; |
510 | struct inode *inode; | |
511 | ||
4a201d6e TM |
512 | if (filename.name[0] == '.') { |
513 | if (filename.len == 1) | |
514 | return; | |
515 | if (filename.len == 2 && filename.name[1] == '.') | |
516 | return; | |
517 | } | |
518 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 519 | |
4a201d6e | 520 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
521 | if (dentry != NULL) { |
522 | if (nfs_same_file(dentry, entry)) { | |
523 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
524 | goto out; | |
525 | } else { | |
526 | d_drop(dentry); | |
527 | dput(dentry); | |
528 | } | |
529 | } | |
530 | ||
531 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
532 | if (dentry == NULL) |
533 | return; | |
534 | ||
d39ab9de BS |
535 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
536 | if (IS_ERR(inode)) | |
537 | goto out; | |
538 | ||
539 | alias = d_materialise_unique(dentry, inode); | |
540 | if (IS_ERR(alias)) | |
541 | goto out; | |
542 | else if (alias) { | |
543 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
544 | dput(alias); | |
545 | } else | |
546 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
547 | ||
548 | out: | |
549 | dput(dentry); | |
d39ab9de BS |
550 | } |
551 | ||
d1bacf9e BS |
552 | /* Perform conversion from xdr to cache array */ |
553 | static | |
8cd51a0c | 554 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 555 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 556 | { |
babddc72 | 557 | struct xdr_stream stream; |
f7da7a12 | 558 | struct xdr_buf buf; |
6650239a | 559 | struct page *scratch; |
99424380 | 560 | struct nfs_cache_array *array; |
5c346854 TM |
561 | unsigned int count = 0; |
562 | int status; | |
babddc72 | 563 | |
6650239a TM |
564 | scratch = alloc_page(GFP_KERNEL); |
565 | if (scratch == NULL) | |
566 | return -ENOMEM; | |
babddc72 | 567 | |
f7da7a12 | 568 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 569 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
570 | |
571 | do { | |
572 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
573 | if (status != 0) { |
574 | if (status == -EAGAIN) | |
575 | status = 0; | |
99424380 | 576 | break; |
8cd51a0c | 577 | } |
99424380 | 578 | |
5c346854 TM |
579 | count++; |
580 | ||
47c716cb | 581 | if (desc->plus != 0) |
d39ab9de | 582 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
583 | |
584 | status = nfs_readdir_add_to_array(entry, page); | |
585 | if (status != 0) | |
586 | break; | |
99424380 BS |
587 | } while (!entry->eof); |
588 | ||
47c716cb | 589 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 590 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
591 | if (!IS_ERR(array)) { |
592 | array->eof_index = array->size; | |
593 | status = 0; | |
594 | nfs_readdir_release_array(page); | |
5c346854 TM |
595 | } else |
596 | status = PTR_ERR(array); | |
1da177e4 | 597 | } |
6650239a TM |
598 | |
599 | put_page(scratch); | |
8cd51a0c | 600 | return status; |
56e4ebf8 BS |
601 | } |
602 | ||
603 | static | |
604 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
605 | { | |
606 | unsigned int i; | |
607 | for (i = 0; i < npages; i++) | |
608 | put_page(pages[i]); | |
609 | } | |
610 | ||
611 | static | |
612 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
613 | unsigned int npages) | |
614 | { | |
56e4ebf8 BS |
615 | nfs_readdir_free_pagearray(pages, npages); |
616 | } | |
617 | ||
618 | /* | |
619 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
620 | * to nfs_readdir_free_large_page | |
621 | */ | |
622 | static | |
6650239a | 623 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 624 | { |
56e4ebf8 BS |
625 | unsigned int i; |
626 | ||
627 | for (i = 0; i < npages; i++) { | |
628 | struct page *page = alloc_page(GFP_KERNEL); | |
629 | if (page == NULL) | |
630 | goto out_freepages; | |
631 | pages[i] = page; | |
632 | } | |
6650239a | 633 | return 0; |
56e4ebf8 | 634 | |
56e4ebf8 BS |
635 | out_freepages: |
636 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 637 | return -ENOMEM; |
1da177e4 LT |
638 | } |
639 | ||
d1bacf9e BS |
640 | static |
641 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 642 | { |
56e4ebf8 BS |
643 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
644 | void *pages_ptr = NULL; | |
d1bacf9e BS |
645 | struct nfs_entry entry; |
646 | struct file *file = desc->file; | |
647 | struct nfs_cache_array *array; | |
8cd51a0c | 648 | int status = -ENOMEM; |
56e4ebf8 | 649 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
650 | |
651 | entry.prev_cookie = 0; | |
0aded708 | 652 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
653 | entry.eof = 0; |
654 | entry.fh = nfs_alloc_fhandle(); | |
655 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 656 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
657 | if (entry.fh == NULL || entry.fattr == NULL) |
658 | goto out; | |
00a92642 | 659 | |
d1bacf9e | 660 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
661 | if (IS_ERR(array)) { |
662 | status = PTR_ERR(array); | |
663 | goto out; | |
664 | } | |
d1bacf9e BS |
665 | memset(array, 0, sizeof(struct nfs_cache_array)); |
666 | array->eof_index = -1; | |
00a92642 | 667 | |
6650239a TM |
668 | status = nfs_readdir_large_page(pages, array_size); |
669 | if (status < 0) | |
d1bacf9e BS |
670 | goto out_release_array; |
671 | do { | |
ac396128 | 672 | unsigned int pglen; |
56e4ebf8 | 673 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 674 | |
d1bacf9e | 675 | if (status < 0) |
00a92642 | 676 | break; |
ac396128 | 677 | pglen = status; |
6650239a | 678 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
679 | if (status < 0) { |
680 | if (status == -ENOSPC) | |
681 | status = 0; | |
682 | break; | |
683 | } | |
684 | } while (array->eof_index < 0); | |
d1bacf9e | 685 | |
56e4ebf8 | 686 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
687 | out_release_array: |
688 | nfs_readdir_release_array(page); | |
689 | out: | |
690 | nfs_free_fattr(entry.fattr); | |
691 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
692 | return status; |
693 | } | |
694 | ||
695 | /* | |
d1bacf9e BS |
696 | * Now we cache directories properly, by converting xdr information |
697 | * to an array that can be used for lookups later. This results in | |
698 | * fewer cache pages, since we can store more information on each page. | |
699 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 700 | */ |
d1bacf9e BS |
701 | static |
702 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 703 | { |
01cce933 | 704 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 705 | int ret; |
1da177e4 | 706 | |
8cd51a0c TM |
707 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
708 | if (ret < 0) | |
d1bacf9e BS |
709 | goto error; |
710 | SetPageUptodate(page); | |
1da177e4 | 711 | |
d1bacf9e BS |
712 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
713 | /* Should never happen */ | |
714 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 715 | } |
d1bacf9e BS |
716 | unlock_page(page); |
717 | return 0; | |
718 | error: | |
719 | unlock_page(page); | |
8cd51a0c | 720 | return ret; |
d1bacf9e | 721 | } |
1da177e4 | 722 | |
d1bacf9e BS |
723 | static |
724 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
725 | { | |
11de3b11 TM |
726 | if (!desc->page->mapping) |
727 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
728 | page_cache_release(desc->page); |
729 | desc->page = NULL; | |
730 | } | |
731 | ||
732 | static | |
733 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
734 | { | |
8cd51a0c | 735 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 736 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
737 | } |
738 | ||
739 | /* | |
d1bacf9e | 740 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 741 | */ |
d1bacf9e BS |
742 | static |
743 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
744 | { | |
745 | int res; | |
746 | ||
747 | desc->page = get_cache_page(desc); | |
748 | if (IS_ERR(desc->page)) | |
749 | return PTR_ERR(desc->page); | |
750 | ||
751 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
752 | if (res != 0) |
753 | cache_page_release(desc); | |
d1bacf9e BS |
754 | return res; |
755 | } | |
756 | ||
757 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
758 | static inline |
759 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
760 | { | |
8cd51a0c | 761 | int res; |
d1bacf9e | 762 | |
0aded708 | 763 | if (desc->page_index == 0) { |
8cd51a0c | 764 | desc->current_index = 0; |
0aded708 TM |
765 | desc->last_cookie = 0; |
766 | } | |
47c716cb | 767 | do { |
d1bacf9e | 768 | res = find_cache_page(desc); |
47c716cb | 769 | } while (res == -EAGAIN); |
1da177e4 LT |
770 | return res; |
771 | } | |
772 | ||
1da177e4 LT |
773 | /* |
774 | * Once we've found the start of the dirent within a page: fill 'er up... | |
775 | */ | |
776 | static | |
777 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
778 | filldir_t filldir) | |
779 | { | |
780 | struct file *file = desc->file; | |
d1bacf9e BS |
781 | int i = 0; |
782 | int res = 0; | |
783 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
784 | struct nfs_open_dir_context *ctx = file->private_data; |
785 | ||
d1bacf9e | 786 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
787 | if (IS_ERR(array)) { |
788 | res = PTR_ERR(array); | |
789 | goto out; | |
790 | } | |
d1bacf9e BS |
791 | |
792 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 793 | struct nfs_cache_array_entry *ent; |
1da177e4 | 794 | |
ece0b423 TM |
795 | ent = &array->array[i]; |
796 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
797 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
798 | ent->d_type) < 0) { | |
ece0b423 | 799 | desc->eof = 1; |
1da177e4 | 800 | break; |
ece0b423 | 801 | } |
00a92642 | 802 | file->f_pos++; |
d1bacf9e BS |
803 | if (i < (array->size-1)) |
804 | *desc->dir_cookie = array->array[i+1].cookie; | |
805 | else | |
806 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
807 | if (ctx->duped != 0) |
808 | ctx->duped = 1; | |
1da177e4 | 809 | } |
47c716cb | 810 | if (array->eof_index >= 0) |
8cd51a0c | 811 | desc->eof = 1; |
d1bacf9e BS |
812 | |
813 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 814 | out: |
d1bacf9e | 815 | cache_page_release(desc); |
1e7cb3dc CL |
816 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
817 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
818 | return res; |
819 | } | |
820 | ||
821 | /* | |
822 | * If we cannot find a cookie in our cache, we suspect that this is | |
823 | * because it points to a deleted file, so we ask the server to return | |
824 | * whatever it thinks is the next entry. We then feed this to filldir. | |
825 | * If all goes well, we should then be able to find our way round the | |
826 | * cache on the next call to readdir_search_pagecache(); | |
827 | * | |
828 | * NOTE: we cannot add the anonymous page to the pagecache because | |
829 | * the data it contains might not be page aligned. Besides, | |
830 | * we should already have a complete representation of the | |
831 | * directory in the page cache by the time we get here. | |
832 | */ | |
833 | static inline | |
834 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
835 | filldir_t filldir) | |
836 | { | |
1da177e4 LT |
837 | struct page *page = NULL; |
838 | int status; | |
d1bacf9e | 839 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
0c030806 | 840 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 841 | |
1e7cb3dc CL |
842 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
843 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
844 | |
845 | page = alloc_page(GFP_HIGHUSER); | |
846 | if (!page) { | |
847 | status = -ENOMEM; | |
848 | goto out; | |
849 | } | |
d1bacf9e | 850 | |
7a8e1dc3 | 851 | desc->page_index = 0; |
0aded708 | 852 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 853 | desc->page = page; |
0c030806 | 854 | ctx->duped = 0; |
7a8e1dc3 | 855 | |
85f8607e TM |
856 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
857 | if (status < 0) | |
1da177e4 LT |
858 | goto out_release; |
859 | ||
860 | status = nfs_do_filldir(desc, dirent, filldir); | |
861 | ||
1da177e4 | 862 | out: |
1e7cb3dc | 863 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 864 | __func__, status); |
1da177e4 LT |
865 | return status; |
866 | out_release: | |
d1bacf9e | 867 | cache_page_release(desc); |
1da177e4 LT |
868 | goto out; |
869 | } | |
870 | ||
00a92642 OG |
871 | /* The file offset position represents the dirent entry number. A |
872 | last cookie cache takes care of the common case of reading the | |
873 | whole directory. | |
1da177e4 LT |
874 | */ |
875 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
876 | { | |
01cce933 | 877 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
878 | struct inode *inode = dentry->d_inode; |
879 | nfs_readdir_descriptor_t my_desc, | |
880 | *desc = &my_desc; | |
480c2006 | 881 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 882 | int res; |
1da177e4 | 883 | |
6da24bc9 | 884 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
885 | dentry->d_parent->d_name.name, dentry->d_name.name, |
886 | (long long)filp->f_pos); | |
91d5b470 CL |
887 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
888 | ||
1da177e4 | 889 | /* |
00a92642 | 890 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 891 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
892 | * to either find the entry with the appropriate number or |
893 | * revalidate the cookie. | |
1da177e4 LT |
894 | */ |
895 | memset(desc, 0, sizeof(*desc)); | |
896 | ||
897 | desc->file = filp; | |
480c2006 | 898 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 899 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
d69ee9b8 | 900 | desc->plus = nfs_use_readdirplus(inode, filp) ? 1 : 0; |
1da177e4 | 901 | |
565277f6 | 902 | nfs_block_sillyrename(dentry); |
1cda707d | 903 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
fccca7fc TM |
904 | if (res < 0) |
905 | goto out; | |
906 | ||
47c716cb | 907 | do { |
1da177e4 | 908 | res = readdir_search_pagecache(desc); |
00a92642 | 909 | |
1da177e4 | 910 | if (res == -EBADCOOKIE) { |
ece0b423 | 911 | res = 0; |
1da177e4 | 912 | /* This means either end of directory */ |
d1bacf9e | 913 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 LT |
914 | /* Or that the server has 'lost' a cookie */ |
915 | res = uncached_readdir(desc, dirent, filldir); | |
ece0b423 | 916 | if (res == 0) |
1da177e4 LT |
917 | continue; |
918 | } | |
1da177e4 LT |
919 | break; |
920 | } | |
921 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 922 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 923 | nfs_zap_caches(inode); |
baf57a09 | 924 | desc->page_index = 0; |
1da177e4 | 925 | desc->plus = 0; |
d1bacf9e | 926 | desc->eof = 0; |
1da177e4 LT |
927 | continue; |
928 | } | |
929 | if (res < 0) | |
930 | break; | |
931 | ||
932 | res = nfs_do_filldir(desc, dirent, filldir); | |
ece0b423 | 933 | if (res < 0) |
1da177e4 | 934 | break; |
47c716cb | 935 | } while (!desc->eof); |
fccca7fc | 936 | out: |
565277f6 | 937 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
938 | if (res > 0) |
939 | res = 0; | |
aa49b4cf | 940 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
941 | dentry->d_parent->d_name.name, dentry->d_name.name, |
942 | res); | |
943 | return res; | |
1da177e4 LT |
944 | } |
945 | ||
10afec90 | 946 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
f0dd2136 | 947 | { |
b84e06c5 CL |
948 | struct dentry *dentry = filp->f_path.dentry; |
949 | struct inode *inode = dentry->d_inode; | |
480c2006 | 950 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 951 | |
6da24bc9 | 952 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
953 | dentry->d_parent->d_name.name, |
954 | dentry->d_name.name, | |
955 | offset, origin); | |
956 | ||
957 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
958 | switch (origin) { |
959 | case 1: | |
960 | offset += filp->f_pos; | |
961 | case 0: | |
962 | if (offset >= 0) | |
963 | break; | |
964 | default: | |
965 | offset = -EINVAL; | |
966 | goto out; | |
967 | } | |
968 | if (offset != filp->f_pos) { | |
969 | filp->f_pos = offset; | |
480c2006 | 970 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 971 | dir_ctx->duped = 0; |
f0dd2136 TM |
972 | } |
973 | out: | |
b84e06c5 | 974 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
975 | return offset; |
976 | } | |
977 | ||
1da177e4 LT |
978 | /* |
979 | * All directory operations under NFS are synchronous, so fsync() | |
980 | * is a dummy operation. | |
981 | */ | |
02c24a82 JB |
982 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
983 | int datasync) | |
1da177e4 | 984 | { |
7ea80859 | 985 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 986 | struct inode *inode = dentry->d_inode; |
7ea80859 | 987 | |
6da24bc9 | 988 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
989 | dentry->d_parent->d_name.name, dentry->d_name.name, |
990 | datasync); | |
991 | ||
02c24a82 | 992 | mutex_lock(&inode->i_mutex); |
54917786 | 993 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 994 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
995 | return 0; |
996 | } | |
997 | ||
bfc69a45 TM |
998 | /** |
999 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
1000 | * @dir - pointer to directory inode | |
1001 | * | |
1002 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1003 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1004 | * on the server that might have invalidated our dcache. | |
1005 | * | |
1006 | * The caller should be holding dir->i_lock | |
1007 | */ | |
1008 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1009 | { | |
011935a0 | 1010 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 TM |
1011 | } |
1012 | ||
1da177e4 LT |
1013 | /* |
1014 | * A check for whether or not the parent directory has changed. | |
1015 | * In the case it has, we assume that the dentries are untrustworthy | |
1016 | * and may need to be looked up again. | |
1017 | */ | |
c79ba787 | 1018 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1019 | { |
1020 | if (IS_ROOT(dentry)) | |
1021 | return 1; | |
4eec952e TM |
1022 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1023 | return 0; | |
f2c77f4e TM |
1024 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1025 | return 0; | |
1026 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1027 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1028 | return 0; | |
1029 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
1030 | return 0; | |
1031 | return 1; | |
1da177e4 LT |
1032 | } |
1033 | ||
1d6757fb TM |
1034 | /* |
1035 | * Return the intent data that applies to this particular path component | |
1036 | * | |
1037 | * Note that the current set of intents only apply to the very last | |
8aeb376c AV |
1038 | * component of the path and none of them is set before that last |
1039 | * component. | |
1d6757fb | 1040 | */ |
34286d66 NP |
1041 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, |
1042 | unsigned int mask) | |
1d6757fb | 1043 | { |
1d6757fb TM |
1044 | return nd->flags & mask; |
1045 | } | |
1046 | ||
a12802ca TM |
1047 | /* |
1048 | * Use intent information to check whether or not we're going to do | |
1049 | * an O_EXCL create using this path component. | |
1050 | */ | |
1051 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) | |
1052 | { | |
1053 | if (NFS_PROTO(dir)->version == 2) | |
1054 | return 0; | |
3516586a | 1055 | return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL); |
a12802ca TM |
1056 | } |
1057 | ||
1d6757fb TM |
1058 | /* |
1059 | * Inode and filehandle revalidation for lookups. | |
1060 | * | |
1061 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1062 | * or if the intent information indicates that we're about to open this | |
1063 | * particular file and the "nocto" mount flag is not set. | |
1064 | * | |
1065 | */ | |
1da177e4 LT |
1066 | static inline |
1067 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) | |
1068 | { | |
1069 | struct nfs_server *server = NFS_SERVER(inode); | |
1070 | ||
36d43a43 | 1071 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1072 | return 0; |
1da177e4 | 1073 | if (nd != NULL) { |
1da177e4 | 1074 | /* VFS wants an on-the-wire revalidation */ |
1d6757fb | 1075 | if (nd->flags & LOOKUP_REVAL) |
1da177e4 LT |
1076 | goto out_force; |
1077 | /* This is an open(2) */ | |
1d6757fb | 1078 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
4e0641a7 TM |
1079 | !(server->flags & NFS_MOUNT_NOCTO) && |
1080 | (S_ISREG(inode->i_mode) || | |
1081 | S_ISDIR(inode->i_mode))) | |
1da177e4 | 1082 | goto out_force; |
4f48af45 | 1083 | return 0; |
1da177e4 LT |
1084 | } |
1085 | return nfs_revalidate_inode(server, inode); | |
1086 | out_force: | |
1087 | return __nfs_revalidate_inode(server, inode); | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * We judge how long we want to trust negative | |
1092 | * dentries by looking at the parent inode mtime. | |
1093 | * | |
1094 | * If parent mtime has changed, we revalidate, else we wait for a | |
1095 | * period corresponding to the parent's attribute cache timeout value. | |
1096 | */ | |
1097 | static inline | |
1098 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
1099 | struct nameidata *nd) | |
1100 | { | |
1da177e4 | 1101 | /* Don't revalidate a negative dentry if we're creating a new file */ |
1d6757fb | 1102 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
1da177e4 | 1103 | return 0; |
4eec952e TM |
1104 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1105 | return 1; | |
1da177e4 LT |
1106 | return !nfs_check_verifier(dir, dentry); |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * This is called every time the dcache has a lookup hit, | |
1111 | * and we should check whether we can really trust that | |
1112 | * lookup. | |
1113 | * | |
1114 | * NOTE! The hit can be a negative hit too, don't assume | |
1115 | * we have an inode! | |
1116 | * | |
1117 | * If the parent directory is seen to have changed, we throw out the | |
1118 | * cached dentry and do a new lookup. | |
1119 | */ | |
34286d66 | 1120 | static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1121 | { |
1122 | struct inode *dir; | |
1123 | struct inode *inode; | |
1124 | struct dentry *parent; | |
e1fb4d05 TM |
1125 | struct nfs_fh *fhandle = NULL; |
1126 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1127 | int error; |
1da177e4 | 1128 | |
34286d66 NP |
1129 | if (nd->flags & LOOKUP_RCU) |
1130 | return -ECHILD; | |
1131 | ||
1da177e4 | 1132 | parent = dget_parent(dentry); |
1da177e4 | 1133 | dir = parent->d_inode; |
91d5b470 | 1134 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1135 | inode = dentry->d_inode; |
1136 | ||
1137 | if (!inode) { | |
1138 | if (nfs_neg_need_reval(dir, dentry, nd)) | |
1139 | goto out_bad; | |
d69ee9b8 | 1140 | goto out_valid_noent; |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1144 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1145 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1146 | dentry->d_name.name); |
1da177e4 LT |
1147 | goto out_bad; |
1148 | } | |
1149 | ||
15860ab1 TM |
1150 | if (nfs_have_delegation(inode, FMODE_READ)) |
1151 | goto out_set_verifier; | |
1152 | ||
1da177e4 | 1153 | /* Force a full look up iff the parent directory has changed */ |
a12802ca | 1154 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
1da177e4 LT |
1155 | if (nfs_lookup_verify_inode(inode, nd)) |
1156 | goto out_zap_parent; | |
1157 | goto out_valid; | |
1158 | } | |
1159 | ||
1160 | if (NFS_STALE(inode)) | |
1161 | goto out_bad; | |
1162 | ||
e1fb4d05 TM |
1163 | error = -ENOMEM; |
1164 | fhandle = nfs_alloc_fhandle(); | |
1165 | fattr = nfs_alloc_fattr(); | |
1166 | if (fhandle == NULL || fattr == NULL) | |
1167 | goto out_error; | |
1168 | ||
80a16b21 | 1169 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1170 | if (error) |
1171 | goto out_bad; | |
e1fb4d05 | 1172 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1173 | goto out_bad; |
e1fb4d05 | 1174 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1175 | goto out_bad; |
1176 | ||
e1fb4d05 TM |
1177 | nfs_free_fattr(fattr); |
1178 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1179 | out_set_verifier: |
cf8ba45e | 1180 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1181 | out_valid: |
d69ee9b8 TM |
1182 | /* Success: notify readdir to use READDIRPLUS */ |
1183 | nfs_advise_use_readdirplus(dir); | |
1184 | out_valid_noent: | |
1da177e4 | 1185 | dput(parent); |
1e7cb3dc | 1186 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1187 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1188 | dentry->d_name.name); |
1da177e4 LT |
1189 | return 1; |
1190 | out_zap_parent: | |
1191 | nfs_zap_caches(dir); | |
1192 | out_bad: | |
a1643a92 | 1193 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1194 | if (inode && S_ISDIR(inode->i_mode)) { |
1195 | /* Purge readdir caches. */ | |
1196 | nfs_zap_caches(inode); | |
1197 | /* If we have submounts, don't unhash ! */ | |
1198 | if (have_submounts(dentry)) | |
1199 | goto out_valid; | |
d9e80b7d AV |
1200 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1201 | goto out_valid; | |
1da177e4 LT |
1202 | shrink_dcache_parent(dentry); |
1203 | } | |
1204 | d_drop(dentry); | |
e1fb4d05 TM |
1205 | nfs_free_fattr(fattr); |
1206 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1207 | dput(parent); |
1e7cb3dc | 1208 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1209 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1210 | dentry->d_name.name); |
1da177e4 | 1211 | return 0; |
e1fb4d05 TM |
1212 | out_error: |
1213 | nfs_free_fattr(fattr); | |
1214 | nfs_free_fhandle(fhandle); | |
1215 | dput(parent); | |
1216 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1217 | __func__, dentry->d_parent->d_name.name, | |
1218 | dentry->d_name.name, error); | |
1219 | return error; | |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | /* | |
1223 | * This is called from dput() when d_count is going to 0. | |
1224 | */ | |
fe15ce44 | 1225 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1226 | { |
1227 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1228 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1229 | dentry->d_flags); | |
1230 | ||
77f11192 TM |
1231 | /* Unhash any dentry with a stale inode */ |
1232 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1233 | return 1; | |
1234 | ||
1da177e4 LT |
1235 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1236 | /* Unhash it, so that ->d_iput() would be called */ | |
1237 | return 1; | |
1238 | } | |
1239 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1240 | /* Unhash it, so that ancestors of killed async unlink | |
1241 | * files will be cleaned up during umount */ | |
1242 | return 1; | |
1243 | } | |
1244 | return 0; | |
1245 | ||
1246 | } | |
1247 | ||
1b83d707 TM |
1248 | static void nfs_drop_nlink(struct inode *inode) |
1249 | { | |
1250 | spin_lock(&inode->i_lock); | |
1251 | if (inode->i_nlink > 0) | |
1252 | drop_nlink(inode); | |
1253 | spin_unlock(&inode->i_lock); | |
1254 | } | |
1255 | ||
1da177e4 LT |
1256 | /* |
1257 | * Called when the dentry loses inode. | |
1258 | * We use it to clean up silly-renamed files. | |
1259 | */ | |
1260 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1261 | { | |
83672d39 NB |
1262 | if (S_ISDIR(inode->i_mode)) |
1263 | /* drop any readdir cache as it could easily be old */ | |
1264 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1265 | ||
1da177e4 | 1266 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1267 | drop_nlink(inode); |
e4eff1a6 | 1268 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1269 | } |
1da177e4 LT |
1270 | iput(inode); |
1271 | } | |
1272 | ||
b1942c5f AV |
1273 | static void nfs_d_release(struct dentry *dentry) |
1274 | { | |
1275 | /* free cached devname value, if it survived that far */ | |
1276 | if (unlikely(dentry->d_fsdata)) { | |
1277 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1278 | WARN_ON(1); | |
1279 | else | |
1280 | kfree(dentry->d_fsdata); | |
1281 | } | |
1282 | } | |
1283 | ||
f786aa90 | 1284 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1285 | .d_revalidate = nfs_lookup_revalidate, |
1286 | .d_delete = nfs_dentry_delete, | |
1287 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1288 | .d_automount = nfs_d_automount, |
b1942c5f | 1289 | .d_release = nfs_d_release, |
1da177e4 LT |
1290 | }; |
1291 | ||
1da177e4 LT |
1292 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
1293 | { | |
1294 | struct dentry *res; | |
565277f6 | 1295 | struct dentry *parent; |
1da177e4 | 1296 | struct inode *inode = NULL; |
e1fb4d05 TM |
1297 | struct nfs_fh *fhandle = NULL; |
1298 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1299 | int error; |
1da177e4 LT |
1300 | |
1301 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1302 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1303 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1304 | |
1305 | res = ERR_PTR(-ENAMETOOLONG); | |
1306 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1307 | goto out; | |
1308 | ||
fd684071 TM |
1309 | /* |
1310 | * If we're doing an exclusive create, optimize away the lookup | |
1311 | * but don't hash the dentry. | |
1312 | */ | |
1313 | if (nfs_is_exclusive_create(dir, nd)) { | |
1314 | d_instantiate(dentry, NULL); | |
1315 | res = NULL; | |
fc0f684c | 1316 | goto out; |
fd684071 | 1317 | } |
1da177e4 | 1318 | |
e1fb4d05 TM |
1319 | res = ERR_PTR(-ENOMEM); |
1320 | fhandle = nfs_alloc_fhandle(); | |
1321 | fattr = nfs_alloc_fattr(); | |
1322 | if (fhandle == NULL || fattr == NULL) | |
1323 | goto out; | |
1324 | ||
565277f6 TM |
1325 | parent = dentry->d_parent; |
1326 | /* Protect against concurrent sillydeletes */ | |
1327 | nfs_block_sillyrename(parent); | |
80a16b21 | 1328 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1329 | if (error == -ENOENT) |
1330 | goto no_entry; | |
1331 | if (error < 0) { | |
1332 | res = ERR_PTR(error); | |
565277f6 | 1333 | goto out_unblock_sillyrename; |
1da177e4 | 1334 | } |
e1fb4d05 | 1335 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1336 | res = ERR_CAST(inode); |
03f28e3a | 1337 | if (IS_ERR(res)) |
565277f6 | 1338 | goto out_unblock_sillyrename; |
54ceac45 | 1339 | |
d69ee9b8 TM |
1340 | /* Success: notify readdir to use READDIRPLUS */ |
1341 | nfs_advise_use_readdirplus(dir); | |
1342 | ||
1da177e4 | 1343 | no_entry: |
54ceac45 | 1344 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1345 | if (res != NULL) { |
1346 | if (IS_ERR(res)) | |
565277f6 | 1347 | goto out_unblock_sillyrename; |
1da177e4 | 1348 | dentry = res; |
9eaef27b | 1349 | } |
1da177e4 | 1350 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1351 | out_unblock_sillyrename: |
1352 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1353 | out: |
e1fb4d05 TM |
1354 | nfs_free_fattr(fattr); |
1355 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1356 | return res; |
1357 | } | |
1358 | ||
1359 | #ifdef CONFIG_NFS_V4 | |
1360 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); | |
1361 | ||
f786aa90 | 1362 | const struct dentry_operations nfs4_dentry_operations = { |
1da177e4 LT |
1363 | .d_revalidate = nfs_open_revalidate, |
1364 | .d_delete = nfs_dentry_delete, | |
1365 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1366 | .d_automount = nfs_d_automount, |
b1942c5f | 1367 | .d_release = nfs_d_release, |
1da177e4 LT |
1368 | }; |
1369 | ||
1d6757fb TM |
1370 | /* |
1371 | * Use intent information to determine whether we need to substitute | |
1372 | * the NFSv4-style stateful OPEN for the LOOKUP call | |
1373 | */ | |
5584c306 | 1374 | static int is_atomic_open(struct nameidata *nd) |
1da177e4 | 1375 | { |
1d6757fb | 1376 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
1da177e4 LT |
1377 | return 0; |
1378 | /* NFS does not (yet) have a stateful open for directories */ | |
1379 | if (nd->flags & LOOKUP_DIRECTORY) | |
1380 | return 0; | |
1381 | /* Are we trying to write to a read only partition? */ | |
2c463e95 | 1382 | if (__mnt_is_readonly(nd->path.mnt) && |
8a5e929d | 1383 | (nd->intent.open.flags & (O_CREAT|O_TRUNC|O_ACCMODE))) |
1da177e4 LT |
1384 | return 0; |
1385 | return 1; | |
1386 | } | |
1387 | ||
8a5e929d AV |
1388 | static fmode_t flags_to_mode(int flags) |
1389 | { | |
1390 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1391 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1392 | res |= FMODE_READ; | |
1393 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1394 | res |= FMODE_WRITE; | |
1395 | return res; | |
1396 | } | |
1397 | ||
51141598 | 1398 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1399 | { |
5ede7b1c | 1400 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1401 | } |
1402 | ||
1403 | static int do_open(struct inode *inode, struct file *filp) | |
1404 | { | |
1405 | nfs_fscache_set_inode_cookie(inode, filp); | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx) | |
1410 | { | |
1411 | struct file *filp; | |
1412 | int ret = 0; | |
1413 | ||
1414 | /* If the open_intent is for execute, we have an extra check to make */ | |
1415 | if (ctx->mode & FMODE_EXEC) { | |
3d4ff43d | 1416 | ret = nfs_may_open(ctx->dentry->d_inode, |
cd9a1c0e TM |
1417 | ctx->cred, |
1418 | nd->intent.open.flags); | |
1419 | if (ret < 0) | |
1420 | goto out; | |
1421 | } | |
3d4ff43d | 1422 | filp = lookup_instantiate_filp(nd, ctx->dentry, do_open); |
cd9a1c0e TM |
1423 | if (IS_ERR(filp)) |
1424 | ret = PTR_ERR(filp); | |
1425 | else | |
1426 | nfs_file_set_open_context(filp, ctx); | |
1427 | out: | |
1428 | put_nfs_open_context(ctx); | |
1429 | return ret; | |
1430 | } | |
1431 | ||
1da177e4 LT |
1432 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1433 | { | |
cd9a1c0e TM |
1434 | struct nfs_open_context *ctx; |
1435 | struct iattr attr; | |
1da177e4 | 1436 | struct dentry *res = NULL; |
f46e0bd3 | 1437 | struct inode *inode; |
cd9a1c0e | 1438 | int open_flags; |
898f635c | 1439 | int err; |
1da177e4 | 1440 | |
1e7cb3dc CL |
1441 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
1442 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1443 | ||
1da177e4 | 1444 | /* Check that we are indeed trying to open this file */ |
5584c306 | 1445 | if (!is_atomic_open(nd)) |
1da177e4 LT |
1446 | goto no_open; |
1447 | ||
1448 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { | |
1449 | res = ERR_PTR(-ENAMETOOLONG); | |
1450 | goto out; | |
1451 | } | |
1da177e4 | 1452 | |
d4d9cdcb TM |
1453 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
1454 | * the dentry. */ | |
3516586a | 1455 | if (nd->flags & LOOKUP_EXCL) { |
d4d9cdcb | 1456 | d_instantiate(dentry, NULL); |
02a913a7 TM |
1457 | goto out; |
1458 | } | |
1da177e4 | 1459 | |
51141598 | 1460 | open_flags = nd->intent.open.flags; |
451146be | 1461 | attr.ia_valid = ATTR_OPEN; |
51141598 AV |
1462 | |
1463 | ctx = create_nfs_open_context(dentry, open_flags); | |
cd9a1c0e TM |
1464 | res = ERR_CAST(ctx); |
1465 | if (IS_ERR(ctx)) | |
1466 | goto out; | |
1467 | ||
cd9a1c0e TM |
1468 | if (nd->flags & LOOKUP_CREATE) { |
1469 | attr.ia_mode = nd->intent.open.create_mode; | |
536e43d1 | 1470 | attr.ia_valid |= ATTR_MODE; |
a8a5da99 | 1471 | attr.ia_mode &= ~current_umask(); |
536e43d1 | 1472 | } else |
898f635c | 1473 | open_flags &= ~(O_EXCL | O_CREAT); |
536e43d1 TM |
1474 | |
1475 | if (open_flags & O_TRUNC) { | |
1476 | attr.ia_valid |= ATTR_SIZE; | |
1477 | attr.ia_size = 0; | |
cd9a1c0e TM |
1478 | } |
1479 | ||
1da177e4 | 1480 | /* Open the file on the server */ |
f46e0bd3 | 1481 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1482 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
f46e0bd3 TM |
1483 | if (IS_ERR(inode)) { |
1484 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1485 | put_nfs_open_context(ctx); |
f46e0bd3 | 1486 | switch (PTR_ERR(inode)) { |
1da177e4 LT |
1487 | /* Make a negative dentry */ |
1488 | case -ENOENT: | |
f46e0bd3 | 1489 | d_add(dentry, NULL); |
02a913a7 TM |
1490 | res = NULL; |
1491 | goto out; | |
1da177e4 | 1492 | /* This turned out not to be a regular file */ |
1788ea6e | 1493 | case -EISDIR: |
6f926b5b TM |
1494 | case -ENOTDIR: |
1495 | goto no_open; | |
1da177e4 LT |
1496 | case -ELOOP: |
1497 | if (!(nd->intent.open.flags & O_NOFOLLOW)) | |
1498 | goto no_open; | |
1da177e4 LT |
1499 | /* case -EINVAL: */ |
1500 | default: | |
f46e0bd3 | 1501 | res = ERR_CAST(inode); |
1da177e4 LT |
1502 | goto out; |
1503 | } | |
cd9a1c0e | 1504 | } |
f46e0bd3 | 1505 | res = d_add_unique(dentry, inode); |
898f635c | 1506 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1507 | if (res != NULL) { |
3d4ff43d AV |
1508 | dput(ctx->dentry); |
1509 | ctx->dentry = dget(res); | |
1da177e4 | 1510 | dentry = res; |
f46e0bd3 | 1511 | } |
898f635c TM |
1512 | err = nfs_intent_set_file(nd, ctx); |
1513 | if (err < 0) { | |
1514 | if (res != NULL) | |
1515 | dput(res); | |
1516 | return ERR_PTR(err); | |
1517 | } | |
1da177e4 | 1518 | out: |
f46e0bd3 | 1519 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1520 | return res; |
1521 | no_open: | |
1522 | return nfs_lookup(dir, dentry, nd); | |
1523 | } | |
1524 | ||
1525 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1526 | { | |
1527 | struct dentry *parent = NULL; | |
657e94b6 | 1528 | struct inode *inode; |
1da177e4 | 1529 | struct inode *dir; |
b8d4cadd | 1530 | struct nfs_open_context *ctx; |
536e43d1 | 1531 | struct iattr attr; |
1da177e4 LT |
1532 | int openflags, ret = 0; |
1533 | ||
657e94b6 NP |
1534 | if (nd->flags & LOOKUP_RCU) |
1535 | return -ECHILD; | |
1536 | ||
1537 | inode = dentry->d_inode; | |
1f063d2c | 1538 | if (!is_atomic_open(nd) || d_mountpoint(dentry)) |
5584c306 | 1539 | goto no_open; |
2b484297 | 1540 | |
1da177e4 LT |
1541 | parent = dget_parent(dentry); |
1542 | dir = parent->d_inode; | |
2b484297 | 1543 | |
1da177e4 LT |
1544 | /* We can't create new files in nfs_open_revalidate(), so we |
1545 | * optimize away revalidation of negative dentries. | |
1546 | */ | |
216d5d06 TM |
1547 | if (inode == NULL) { |
1548 | if (!nfs_neg_need_reval(dir, dentry, nd)) | |
1549 | ret = 1; | |
1da177e4 | 1550 | goto out; |
216d5d06 TM |
1551 | } |
1552 | ||
1da177e4 LT |
1553 | /* NFS only supports OPEN on regular files */ |
1554 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1555 | goto no_open_dput; |
1da177e4 LT |
1556 | openflags = nd->intent.open.flags; |
1557 | /* We cannot do exclusive creation on a positive dentry */ | |
1558 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) | |
5584c306 | 1559 | goto no_open_dput; |
536e43d1 TM |
1560 | /* We can't create new files here */ |
1561 | openflags &= ~(O_CREAT|O_EXCL); | |
1da177e4 | 1562 | |
51141598 | 1563 | ctx = create_nfs_open_context(dentry, openflags); |
b8d4cadd TM |
1564 | ret = PTR_ERR(ctx); |
1565 | if (IS_ERR(ctx)) | |
1566 | goto out; | |
536e43d1 | 1567 | |
451146be | 1568 | attr.ia_valid = ATTR_OPEN; |
536e43d1 TM |
1569 | if (openflags & O_TRUNC) { |
1570 | attr.ia_valid |= ATTR_SIZE; | |
1571 | attr.ia_size = 0; | |
1572 | nfs_wb_all(inode); | |
1573 | } | |
1574 | ||
1da177e4 | 1575 | /* |
1b1dcc1b | 1576 | * Note: we're not holding inode->i_mutex and so may be racing with |
1da177e4 LT |
1577 | * operations that change the directory. We therefore save the |
1578 | * change attribute *before* we do the RPC call. | |
1579 | */ | |
536e43d1 | 1580 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr); |
535918f1 TM |
1581 | if (IS_ERR(inode)) { |
1582 | ret = PTR_ERR(inode); | |
1583 | switch (ret) { | |
1584 | case -EPERM: | |
1585 | case -EACCES: | |
1586 | case -EDQUOT: | |
1587 | case -ENOSPC: | |
1588 | case -EROFS: | |
1589 | goto out_put_ctx; | |
1590 | default: | |
1591 | goto out_drop; | |
1592 | } | |
1593 | } | |
1594 | iput(inode); | |
898f635c | 1595 | if (inode != dentry->d_inode) |
535918f1 | 1596 | goto out_drop; |
898f635c TM |
1597 | |
1598 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1599 | ret = nfs_intent_set_file(nd, ctx); | |
1600 | if (ret >= 0) | |
1601 | ret = 1; | |
1da177e4 LT |
1602 | out: |
1603 | dput(parent); | |
1da177e4 | 1604 | return ret; |
535918f1 TM |
1605 | out_drop: |
1606 | d_drop(dentry); | |
1607 | ret = 0; | |
1608 | out_put_ctx: | |
1609 | put_nfs_open_context(ctx); | |
1610 | goto out; | |
1611 | ||
5584c306 | 1612 | no_open_dput: |
1da177e4 | 1613 | dput(parent); |
5584c306 | 1614 | no_open: |
1da177e4 LT |
1615 | return nfs_lookup_revalidate(dentry, nd); |
1616 | } | |
c0204fd2 | 1617 | |
4acdaf27 AV |
1618 | static int nfs_open_create(struct inode *dir, struct dentry *dentry, |
1619 | umode_t mode, struct nameidata *nd) | |
c0204fd2 TM |
1620 | { |
1621 | struct nfs_open_context *ctx = NULL; | |
1622 | struct iattr attr; | |
1623 | int error; | |
8a5e929d | 1624 | int open_flags = O_CREAT|O_EXCL; |
c0204fd2 TM |
1625 | |
1626 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", | |
1627 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1628 | ||
1629 | attr.ia_mode = mode; | |
1630 | attr.ia_valid = ATTR_MODE; | |
1631 | ||
dd7dd556 | 1632 | if (nd) |
c0204fd2 TM |
1633 | open_flags = nd->intent.open.flags; |
1634 | ||
f7c85868 AV |
1635 | ctx = create_nfs_open_context(dentry, open_flags); |
1636 | error = PTR_ERR(ctx); | |
1637 | if (IS_ERR(ctx)) | |
1638 | goto out_err_drop; | |
c0204fd2 TM |
1639 | |
1640 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx); | |
1641 | if (error != 0) | |
1642 | goto out_put_ctx; | |
dd7dd556 | 1643 | if (nd) { |
898f635c TM |
1644 | error = nfs_intent_set_file(nd, ctx); |
1645 | if (error < 0) | |
1646 | goto out_err; | |
f7c85868 AV |
1647 | } else { |
1648 | put_nfs_open_context(ctx); | |
898f635c | 1649 | } |
c0204fd2 TM |
1650 | return 0; |
1651 | out_put_ctx: | |
f7c85868 | 1652 | put_nfs_open_context(ctx); |
898f635c | 1653 | out_err_drop: |
c0204fd2 | 1654 | d_drop(dentry); |
898f635c | 1655 | out_err: |
c0204fd2 TM |
1656 | return error; |
1657 | } | |
1658 | ||
1da177e4 LT |
1659 | #endif /* CONFIG_NFSV4 */ |
1660 | ||
1da177e4 LT |
1661 | /* |
1662 | * Code common to create, mkdir, and mknod. | |
1663 | */ | |
1664 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1665 | struct nfs_fattr *fattr) | |
1666 | { | |
fab728e1 TM |
1667 | struct dentry *parent = dget_parent(dentry); |
1668 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1669 | struct inode *inode; |
1670 | int error = -EACCES; | |
1671 | ||
fab728e1 TM |
1672 | d_drop(dentry); |
1673 | ||
1da177e4 LT |
1674 | /* We may have been initialized further down */ |
1675 | if (dentry->d_inode) | |
fab728e1 | 1676 | goto out; |
1da177e4 | 1677 | if (fhandle->size == 0) { |
80a16b21 | 1678 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1679 | if (error) |
fab728e1 | 1680 | goto out_error; |
1da177e4 | 1681 | } |
5724ab37 | 1682 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1683 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1684 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1685 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1686 | if (error < 0) |
fab728e1 | 1687 | goto out_error; |
1da177e4 | 1688 | } |
1da177e4 | 1689 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1690 | error = PTR_ERR(inode); |
1691 | if (IS_ERR(inode)) | |
fab728e1 TM |
1692 | goto out_error; |
1693 | d_add(dentry, inode); | |
1694 | out: | |
1695 | dput(parent); | |
1da177e4 | 1696 | return 0; |
fab728e1 TM |
1697 | out_error: |
1698 | nfs_mark_for_revalidate(dir); | |
1699 | dput(parent); | |
1700 | return error; | |
1da177e4 LT |
1701 | } |
1702 | ||
1703 | /* | |
1704 | * Following a failed create operation, we drop the dentry rather | |
1705 | * than retain a negative dentry. This avoids a problem in the event | |
1706 | * that the operation succeeded on the server, but an error in the | |
1707 | * reply path made it appear to have failed. | |
1708 | */ | |
4acdaf27 AV |
1709 | static int nfs_create(struct inode *dir, struct dentry *dentry, |
1710 | umode_t mode, struct nameidata *nd) | |
1da177e4 LT |
1711 | { |
1712 | struct iattr attr; | |
1713 | int error; | |
8a5e929d | 1714 | int open_flags = O_CREAT|O_EXCL; |
1da177e4 | 1715 | |
1e7cb3dc CL |
1716 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1717 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1718 | |
1719 | attr.ia_mode = mode; | |
1720 | attr.ia_valid = ATTR_MODE; | |
1721 | ||
dd7dd556 | 1722 | if (nd) |
8a0eebf6 TM |
1723 | open_flags = nd->intent.open.flags; |
1724 | ||
1725 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL); | |
1da177e4 LT |
1726 | if (error != 0) |
1727 | goto out_err; | |
1da177e4 LT |
1728 | return 0; |
1729 | out_err: | |
1da177e4 LT |
1730 | d_drop(dentry); |
1731 | return error; | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * See comments for nfs_proc_create regarding failed operations. | |
1736 | */ | |
1737 | static int | |
1a67aafb | 1738 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1739 | { |
1740 | struct iattr attr; | |
1741 | int status; | |
1742 | ||
1e7cb3dc CL |
1743 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1744 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1745 | |
1746 | if (!new_valid_dev(rdev)) | |
1747 | return -EINVAL; | |
1748 | ||
1749 | attr.ia_mode = mode; | |
1750 | attr.ia_valid = ATTR_MODE; | |
1751 | ||
1da177e4 | 1752 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1753 | if (status != 0) |
1754 | goto out_err; | |
1da177e4 LT |
1755 | return 0; |
1756 | out_err: | |
1da177e4 LT |
1757 | d_drop(dentry); |
1758 | return status; | |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * See comments for nfs_proc_create regarding failed operations. | |
1763 | */ | |
18bb1db3 | 1764 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1765 | { |
1766 | struct iattr attr; | |
1767 | int error; | |
1768 | ||
1e7cb3dc CL |
1769 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1770 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1771 | |
1772 | attr.ia_valid = ATTR_MODE; | |
1773 | attr.ia_mode = mode | S_IFDIR; | |
1774 | ||
1da177e4 | 1775 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1776 | if (error != 0) |
1777 | goto out_err; | |
1da177e4 LT |
1778 | return 0; |
1779 | out_err: | |
1780 | d_drop(dentry); | |
1da177e4 LT |
1781 | return error; |
1782 | } | |
1783 | ||
d45b9d8b TM |
1784 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1785 | { | |
1786 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1787 | d_delete(dentry); | |
1788 | } | |
1789 | ||
1da177e4 LT |
1790 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1791 | { | |
1792 | int error; | |
1793 | ||
1e7cb3dc CL |
1794 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1795 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1796 | |
1da177e4 LT |
1797 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1798 | /* Ensure the VFS deletes this inode */ | |
1799 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1800 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1801 | else if (error == -ENOENT) |
1802 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1803 | |
1804 | return error; | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | /* |
1808 | * Remove a file after making sure there are no pending writes, | |
1809 | * and after checking that the file has only one user. | |
1810 | * | |
1811 | * We invalidate the attribute cache and free the inode prior to the operation | |
1812 | * to avoid possible races if the server reuses the inode. | |
1813 | */ | |
1814 | static int nfs_safe_remove(struct dentry *dentry) | |
1815 | { | |
1816 | struct inode *dir = dentry->d_parent->d_inode; | |
1817 | struct inode *inode = dentry->d_inode; | |
1818 | int error = -EBUSY; | |
1819 | ||
1820 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1821 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1822 | ||
1823 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1824 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1825 | error = 0; | |
1826 | goto out; | |
1827 | } | |
1828 | ||
1da177e4 | 1829 | if (inode != NULL) { |
cae7a073 | 1830 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1831 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1832 | /* The VFS may want to delete this inode */ | |
1833 | if (error == 0) | |
1b83d707 | 1834 | nfs_drop_nlink(inode); |
5ba7cc48 | 1835 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1836 | } else |
1837 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1838 | if (error == -ENOENT) |
1839 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1840 | out: |
1841 | return error; | |
1842 | } | |
1843 | ||
1844 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1845 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1846 | * | |
1847 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1848 | */ | |
1849 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) | |
1850 | { | |
1851 | int error; | |
1852 | int need_rehash = 0; | |
1853 | ||
1854 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1855 | dir->i_ino, dentry->d_name.name); | |
1856 | ||
1da177e4 | 1857 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1858 | if (dentry->d_count > 1) { |
1da177e4 | 1859 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1860 | /* Start asynchronous writeout of the inode */ |
1861 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1862 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1863 | return error; |
1864 | } | |
1865 | if (!d_unhashed(dentry)) { | |
1866 | __d_drop(dentry); | |
1867 | need_rehash = 1; | |
1868 | } | |
1869 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1870 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1871 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1872 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1873 | } else if (need_rehash) | |
1874 | d_rehash(dentry); | |
1da177e4 LT |
1875 | return error; |
1876 | } | |
1877 | ||
873101b3 CL |
1878 | /* |
1879 | * To create a symbolic link, most file systems instantiate a new inode, | |
1880 | * add a page to it containing the path, then write it out to the disk | |
1881 | * using prepare_write/commit_write. | |
1882 | * | |
1883 | * Unfortunately the NFS client can't create the in-core inode first | |
1884 | * because it needs a file handle to create an in-core inode (see | |
1885 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1886 | * symlink request has completed on the server. | |
1887 | * | |
1888 | * So instead we allocate a raw page, copy the symname into it, then do | |
1889 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1890 | * now have a new file handle and can instantiate an in-core NFS inode | |
1891 | * and move the raw page into its mapping. | |
1892 | */ | |
1893 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1da177e4 | 1894 | { |
873101b3 CL |
1895 | struct pagevec lru_pvec; |
1896 | struct page *page; | |
1897 | char *kaddr; | |
1da177e4 | 1898 | struct iattr attr; |
873101b3 | 1899 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1900 | int error; |
1901 | ||
1902 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1903 | dir->i_ino, dentry->d_name.name, symname); | |
1904 | ||
873101b3 CL |
1905 | if (pathlen > PAGE_SIZE) |
1906 | return -ENAMETOOLONG; | |
1da177e4 | 1907 | |
873101b3 CL |
1908 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1909 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1910 | |
83d93f22 | 1911 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1912 | if (!page) |
873101b3 | 1913 | return -ENOMEM; |
873101b3 | 1914 | |
2b86ce2d | 1915 | kaddr = kmap_atomic(page); |
873101b3 CL |
1916 | memcpy(kaddr, symname, pathlen); |
1917 | if (pathlen < PAGE_SIZE) | |
1918 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1919 | kunmap_atomic(kaddr); |
873101b3 | 1920 | |
94a6d753 | 1921 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1922 | if (error != 0) { |
1923 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1924 | dir->i_sb->s_id, dir->i_ino, | |
1925 | dentry->d_name.name, symname, error); | |
1da177e4 | 1926 | d_drop(dentry); |
873101b3 | 1927 | __free_page(page); |
873101b3 CL |
1928 | return error; |
1929 | } | |
1930 | ||
1931 | /* | |
1932 | * No big deal if we can't add this page to the page cache here. | |
1933 | * READLINK will get the missing page from the server if needed. | |
1934 | */ | |
1935 | pagevec_init(&lru_pvec, 0); | |
1936 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1937 | GFP_KERNEL)) { | |
39cf8a13 | 1938 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1939 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1940 | SetPageUptodate(page); |
1941 | unlock_page(page); | |
1942 | } else | |
1943 | __free_page(page); | |
1944 | ||
873101b3 | 1945 | return 0; |
1da177e4 LT |
1946 | } |
1947 | ||
1948 | static int | |
1949 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
1950 | { | |
1951 | struct inode *inode = old_dentry->d_inode; | |
1952 | int error; | |
1953 | ||
1954 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1955 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1956 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1957 | ||
9a3936aa TM |
1958 | nfs_inode_return_delegation(inode); |
1959 | ||
9697d234 | 1960 | d_drop(dentry); |
1da177e4 | 1961 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1962 | if (error == 0) { |
7de9c6ee | 1963 | ihold(inode); |
9697d234 | 1964 | d_add(dentry, inode); |
cf809556 | 1965 | } |
1da177e4 LT |
1966 | return error; |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * RENAME | |
1971 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1972 | * different file handle for the same inode after a rename (e.g. when | |
1973 | * moving to a different directory). A fail-safe method to do so would | |
1974 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1975 | * rename the old file using the sillyrename stuff. This way, the original | |
1976 | * file in old_dir will go away when the last process iput()s the inode. | |
1977 | * | |
1978 | * FIXED. | |
1979 | * | |
1980 | * It actually works quite well. One needs to have the possibility for | |
1981 | * at least one ".nfs..." file in each directory the file ever gets | |
1982 | * moved or linked to which happens automagically with the new | |
1983 | * implementation that only depends on the dcache stuff instead of | |
1984 | * using the inode layer | |
1985 | * | |
1986 | * Unfortunately, things are a little more complicated than indicated | |
1987 | * above. For a cross-directory move, we want to make sure we can get | |
1988 | * rid of the old inode after the operation. This means there must be | |
1989 | * no pending writes (if it's a file), and the use count must be 1. | |
1990 | * If these conditions are met, we can drop the dentries before doing | |
1991 | * the rename. | |
1992 | */ | |
1993 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1994 | struct inode *new_dir, struct dentry *new_dentry) | |
1995 | { | |
1996 | struct inode *old_inode = old_dentry->d_inode; | |
1997 | struct inode *new_inode = new_dentry->d_inode; | |
1998 | struct dentry *dentry = NULL, *rehash = NULL; | |
1999 | int error = -EBUSY; | |
2000 | ||
1da177e4 LT |
2001 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
2002 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
2003 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 2004 | new_dentry->d_count); |
1da177e4 LT |
2005 | |
2006 | /* | |
28f79a1a MS |
2007 | * For non-directories, check whether the target is busy and if so, |
2008 | * make a copy of the dentry and then do a silly-rename. If the | |
2009 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2010 | * the new target. | |
1da177e4 | 2011 | */ |
27226104 MS |
2012 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2013 | /* | |
2014 | * To prevent any new references to the target during the | |
2015 | * rename, we unhash the dentry in advance. | |
2016 | */ | |
2017 | if (!d_unhashed(new_dentry)) { | |
2018 | d_drop(new_dentry); | |
2019 | rehash = new_dentry; | |
2020 | } | |
1da177e4 | 2021 | |
b7ab39f6 | 2022 | if (new_dentry->d_count > 2) { |
27226104 MS |
2023 | int err; |
2024 | ||
2025 | /* copy the target dentry's name */ | |
2026 | dentry = d_alloc(new_dentry->d_parent, | |
2027 | &new_dentry->d_name); | |
2028 | if (!dentry) | |
2029 | goto out; | |
2030 | ||
2031 | /* silly-rename the existing target ... */ | |
2032 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2033 | if (err) |
27226104 | 2034 | goto out; |
24e93025 MS |
2035 | |
2036 | new_dentry = dentry; | |
56335936 | 2037 | rehash = NULL; |
24e93025 | 2038 | new_inode = NULL; |
27226104 | 2039 | } |
b1e4adf4 | 2040 | } |
1da177e4 | 2041 | |
cae7a073 | 2042 | nfs_inode_return_delegation(old_inode); |
b1e4adf4 | 2043 | if (new_inode != NULL) |
24174119 | 2044 | nfs_inode_return_delegation(new_inode); |
1da177e4 | 2045 | |
1da177e4 LT |
2046 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
2047 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 2048 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
2049 | out: |
2050 | if (rehash) | |
2051 | d_rehash(rehash); | |
2052 | if (!error) { | |
b1e4adf4 TM |
2053 | if (new_inode != NULL) |
2054 | nfs_drop_nlink(new_inode); | |
349457cc | 2055 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
2056 | nfs_set_verifier(new_dentry, |
2057 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
2058 | } else if (error == -ENOENT) |
2059 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
2060 | |
2061 | /* new dentry created? */ | |
2062 | if (dentry) | |
2063 | dput(dentry); | |
1da177e4 LT |
2064 | return error; |
2065 | } | |
2066 | ||
cfcea3e8 TM |
2067 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2068 | static LIST_HEAD(nfs_access_lru_list); | |
2069 | static atomic_long_t nfs_access_nr_entries; | |
2070 | ||
1c3c07e9 TM |
2071 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2072 | { | |
2073 | put_rpccred(entry->cred); | |
2074 | kfree(entry); | |
cfcea3e8 TM |
2075 | smp_mb__before_atomic_dec(); |
2076 | atomic_long_dec(&nfs_access_nr_entries); | |
2077 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
2078 | } |
2079 | ||
1a81bb8a TM |
2080 | static void nfs_access_free_list(struct list_head *head) |
2081 | { | |
2082 | struct nfs_access_entry *cache; | |
2083 | ||
2084 | while (!list_empty(head)) { | |
2085 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2086 | list_del(&cache->lru); | |
2087 | nfs_access_free_entry(cache); | |
2088 | } | |
2089 | } | |
2090 | ||
1495f230 YH |
2091 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
2092 | struct shrink_control *sc) | |
979df72e TM |
2093 | { |
2094 | LIST_HEAD(head); | |
aa510da5 | 2095 | struct nfs_inode *nfsi, *next; |
979df72e | 2096 | struct nfs_access_entry *cache; |
1495f230 YH |
2097 | int nr_to_scan = sc->nr_to_scan; |
2098 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 2099 | |
61d5eb29 TM |
2100 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
2101 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 2102 | |
a50f7951 | 2103 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2104 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2105 | struct inode *inode; |
2106 | ||
2107 | if (nr_to_scan-- == 0) | |
2108 | break; | |
9c7e7e23 | 2109 | inode = &nfsi->vfs_inode; |
979df72e TM |
2110 | spin_lock(&inode->i_lock); |
2111 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2112 | goto remove_lru_entry; | |
2113 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2114 | struct nfs_access_entry, lru); | |
2115 | list_move(&cache->lru, &head); | |
2116 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
2117 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
2118 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2119 | &nfs_access_lru_list); | |
2120 | else { | |
2121 | remove_lru_entry: | |
2122 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2123 | smp_mb__before_clear_bit(); |
979df72e | 2124 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2125 | smp_mb__after_clear_bit(); |
979df72e | 2126 | } |
59844a9b | 2127 | spin_unlock(&inode->i_lock); |
979df72e TM |
2128 | } |
2129 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2130 | nfs_access_free_list(&head); |
979df72e TM |
2131 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2132 | } | |
2133 | ||
1a81bb8a | 2134 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2135 | { |
1c3c07e9 | 2136 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2137 | struct rb_node *n; |
1c3c07e9 TM |
2138 | struct nfs_access_entry *entry; |
2139 | ||
2140 | /* Unhook entries from the cache */ | |
2141 | while ((n = rb_first(root_node)) != NULL) { | |
2142 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2143 | rb_erase(n, root_node); | |
1a81bb8a | 2144 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2145 | } |
2146 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2147 | } |
2148 | ||
1c3c07e9 | 2149 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2150 | { |
1a81bb8a TM |
2151 | LIST_HEAD(head); |
2152 | ||
2153 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2154 | return; | |
cfcea3e8 | 2155 | /* Remove from global LRU init */ |
1a81bb8a TM |
2156 | spin_lock(&nfs_access_lru_lock); |
2157 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2158 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2159 | |
1c3c07e9 | 2160 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2161 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2162 | spin_unlock(&inode->i_lock); | |
2163 | spin_unlock(&nfs_access_lru_lock); | |
2164 | nfs_access_free_list(&head); | |
1c3c07e9 | 2165 | } |
1da177e4 | 2166 | |
1c3c07e9 TM |
2167 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2168 | { | |
2169 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2170 | struct nfs_access_entry *entry; | |
2171 | ||
2172 | while (n != NULL) { | |
2173 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2174 | ||
2175 | if (cred < entry->cred) | |
2176 | n = n->rb_left; | |
2177 | else if (cred > entry->cred) | |
2178 | n = n->rb_right; | |
2179 | else | |
2180 | return entry; | |
1da177e4 | 2181 | } |
1c3c07e9 TM |
2182 | return NULL; |
2183 | } | |
2184 | ||
af22f94a | 2185 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2186 | { |
2187 | struct nfs_inode *nfsi = NFS_I(inode); | |
2188 | struct nfs_access_entry *cache; | |
2189 | int err = -ENOENT; | |
2190 | ||
dc59250c | 2191 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2192 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2193 | goto out_zap; | |
2194 | cache = nfs_access_search_rbtree(inode, cred); | |
2195 | if (cache == NULL) | |
2196 | goto out; | |
b4d2314b | 2197 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2198 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2199 | goto out_stale; |
2200 | res->jiffies = cache->jiffies; | |
2201 | res->cred = cache->cred; | |
2202 | res->mask = cache->mask; | |
cfcea3e8 | 2203 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2204 | err = 0; |
2205 | out: | |
2206 | spin_unlock(&inode->i_lock); | |
2207 | return err; | |
2208 | out_stale: | |
2209 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2210 | list_del(&cache->lru); |
1c3c07e9 TM |
2211 | spin_unlock(&inode->i_lock); |
2212 | nfs_access_free_entry(cache); | |
2213 | return -ENOENT; | |
2214 | out_zap: | |
1a81bb8a TM |
2215 | spin_unlock(&inode->i_lock); |
2216 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2217 | return -ENOENT; |
2218 | } | |
2219 | ||
2220 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2221 | { | |
cfcea3e8 TM |
2222 | struct nfs_inode *nfsi = NFS_I(inode); |
2223 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2224 | struct rb_node **p = &root_node->rb_node; |
2225 | struct rb_node *parent = NULL; | |
2226 | struct nfs_access_entry *entry; | |
2227 | ||
2228 | spin_lock(&inode->i_lock); | |
2229 | while (*p != NULL) { | |
2230 | parent = *p; | |
2231 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2232 | ||
2233 | if (set->cred < entry->cred) | |
2234 | p = &parent->rb_left; | |
2235 | else if (set->cred > entry->cred) | |
2236 | p = &parent->rb_right; | |
2237 | else | |
2238 | goto found; | |
2239 | } | |
2240 | rb_link_node(&set->rb_node, parent, p); | |
2241 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2242 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2243 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2244 | return; |
2245 | found: | |
2246 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2247 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2248 | list_del(&entry->lru); | |
1c3c07e9 TM |
2249 | spin_unlock(&inode->i_lock); |
2250 | nfs_access_free_entry(entry); | |
2251 | } | |
2252 | ||
af22f94a | 2253 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2254 | { |
2255 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2256 | if (cache == NULL) | |
2257 | return; | |
2258 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2259 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2260 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2261 | cache->mask = set->mask; |
1c3c07e9 TM |
2262 | |
2263 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2264 | |
2265 | /* Update accounting */ | |
2266 | smp_mb__before_atomic_inc(); | |
2267 | atomic_long_inc(&nfs_access_nr_entries); | |
2268 | smp_mb__after_atomic_inc(); | |
2269 | ||
2270 | /* Add inode to global LRU list */ | |
1a81bb8a | 2271 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2272 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2273 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2274 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2275 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2276 | spin_unlock(&nfs_access_lru_lock); |
2277 | } | |
1da177e4 LT |
2278 | } |
2279 | ||
2280 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2281 | { | |
2282 | struct nfs_access_entry cache; | |
2283 | int status; | |
2284 | ||
2285 | status = nfs_access_get_cached(inode, cred, &cache); | |
2286 | if (status == 0) | |
2287 | goto out; | |
2288 | ||
2289 | /* Be clever: ask server to check for all possible rights */ | |
2290 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2291 | cache.cred = cred; | |
2292 | cache.jiffies = jiffies; | |
2293 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2294 | if (status != 0) { |
2295 | if (status == -ESTALE) { | |
2296 | nfs_zap_caches(inode); | |
2297 | if (!S_ISDIR(inode->i_mode)) | |
2298 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2299 | } | |
1da177e4 | 2300 | return status; |
a71ee337 | 2301 | } |
1da177e4 LT |
2302 | nfs_access_add_cache(inode, &cache); |
2303 | out: | |
e6305c43 | 2304 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2305 | return 0; |
2306 | return -EACCES; | |
2307 | } | |
2308 | ||
af22f94a TM |
2309 | static int nfs_open_permission_mask(int openflags) |
2310 | { | |
2311 | int mask = 0; | |
2312 | ||
8a5e929d | 2313 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2314 | mask |= MAY_READ; |
8a5e929d | 2315 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2316 | mask |= MAY_WRITE; |
8a5e929d | 2317 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2318 | mask |= MAY_EXEC; |
2319 | return mask; | |
2320 | } | |
2321 | ||
2322 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2323 | { | |
2324 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2325 | } | |
2326 | ||
10556cb2 | 2327 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2328 | { |
2329 | struct rpc_cred *cred; | |
2330 | int res = 0; | |
2331 | ||
10556cb2 | 2332 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2333 | return -ECHILD; |
2334 | ||
91d5b470 CL |
2335 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2336 | ||
e6305c43 | 2337 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2338 | goto out; |
2339 | /* Is this sys_access() ? */ | |
9cfcac81 | 2340 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2341 | goto force_lookup; |
2342 | ||
2343 | switch (inode->i_mode & S_IFMT) { | |
2344 | case S_IFLNK: | |
2345 | goto out; | |
2346 | case S_IFREG: | |
2347 | /* NFSv4 has atomic_open... */ | |
2348 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2349 | && (mask & MAY_OPEN) |
2350 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2351 | goto out; |
2352 | break; | |
2353 | case S_IFDIR: | |
2354 | /* | |
2355 | * Optimize away all write operations, since the server | |
2356 | * will check permissions when we perform the op. | |
2357 | */ | |
2358 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2359 | goto out; | |
2360 | } | |
2361 | ||
2362 | force_lookup: | |
1da177e4 LT |
2363 | if (!NFS_PROTO(inode)->access) |
2364 | goto out_notsup; | |
2365 | ||
98a8e323 | 2366 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2367 | if (!IS_ERR(cred)) { |
2368 | res = nfs_do_access(inode, cred, mask); | |
2369 | put_rpccred(cred); | |
2370 | } else | |
2371 | res = PTR_ERR(cred); | |
1da177e4 | 2372 | out: |
f696a365 MS |
2373 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2374 | res = -EACCES; | |
2375 | ||
1e7cb3dc CL |
2376 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2377 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2378 | return res; |
2379 | out_notsup: | |
2380 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2381 | if (res == 0) | |
2830ba7f | 2382 | res = generic_permission(inode, mask); |
1e7cb3dc | 2383 | goto out; |
1da177e4 LT |
2384 | } |
2385 | ||
2386 | /* | |
2387 | * Local variables: | |
2388 | * version-control: t | |
2389 | * kept-new-versions: 5 | |
2390 | * End: | |
2391 | */ |