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 | ||
ddda8e0a | 20 | #include <linux/module.h> |
1da177e4 LT |
21 | #include <linux/time.h> |
22 | #include <linux/errno.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/sunrpc/clnt.h> | |
30 | #include <linux/nfs_fs.h> | |
31 | #include <linux/nfs_mount.h> | |
32 | #include <linux/pagemap.h> | |
873101b3 | 33 | #include <linux/pagevec.h> |
1da177e4 | 34 | #include <linux/namei.h> |
54ceac45 | 35 | #include <linux/mount.h> |
e8edc6e0 | 36 | #include <linux/sched.h> |
04e4bd1c | 37 | #include <linux/kmemleak.h> |
64c2ce8b | 38 | #include <linux/xattr.h> |
1da177e4 LT |
39 | |
40 | #include "delegation.h" | |
91d5b470 | 41 | #include "iostat.h" |
4c30d56e | 42 | #include "internal.h" |
cd9a1c0e | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | /* #define NFS_DEBUG_VERBOSE 1 */ |
46 | ||
47 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 48 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 49 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 50 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 51 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 52 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 53 | |
4b6f5d20 | 54 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 55 | .llseek = nfs_llseek_dir, |
1da177e4 | 56 | .read = generic_read_dir, |
23db8620 | 57 | .iterate = nfs_readdir, |
1da177e4 | 58 | .open = nfs_opendir, |
480c2006 | 59 | .release = nfs_closedir, |
1da177e4 LT |
60 | .fsync = nfs_fsync_dir, |
61 | }; | |
62 | ||
11de3b11 TM |
63 | const struct address_space_operations nfs_dir_aops = { |
64 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
65 | }; |
66 | ||
0c030806 | 67 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
68 | { |
69 | struct nfs_open_dir_context *ctx; | |
70 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
71 | if (ctx != NULL) { | |
8ef2ce3e | 72 | ctx->duped = 0; |
0c030806 | 73 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 74 | ctx->dir_cookie = 0; |
8ef2ce3e | 75 | ctx->dup_cookie = 0; |
480c2006 | 76 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
77 | return ctx; |
78 | } | |
79 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
80 | } |
81 | ||
82 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
83 | { | |
84 | put_rpccred(ctx->cred); | |
85 | kfree(ctx); | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Open file | |
90 | */ | |
91 | static int | |
92 | nfs_opendir(struct inode *inode, struct file *filp) | |
93 | { | |
480c2006 BS |
94 | int res = 0; |
95 | struct nfs_open_dir_context *ctx; | |
96 | struct rpc_cred *cred; | |
1da177e4 | 97 | |
6da24bc9 | 98 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
99 | filp->f_path.dentry->d_parent->d_name.name, |
100 | filp->f_path.dentry->d_name.name); | |
101 | ||
102 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 103 | |
480c2006 BS |
104 | cred = rpc_lookup_cred(); |
105 | if (IS_ERR(cred)) | |
106 | return PTR_ERR(cred); | |
0c030806 | 107 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
108 | if (IS_ERR(ctx)) { |
109 | res = PTR_ERR(ctx); | |
110 | goto out; | |
111 | } | |
112 | filp->private_data = ctx; | |
f5a73672 NB |
113 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
114 | /* This is a mountpoint, so d_revalidate will never | |
115 | * have been called, so we need to refresh the | |
116 | * inode (for close-open consistency) ourselves. | |
117 | */ | |
118 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
119 | } | |
480c2006 BS |
120 | out: |
121 | put_rpccred(cred); | |
1da177e4 LT |
122 | return res; |
123 | } | |
124 | ||
480c2006 BS |
125 | static int |
126 | nfs_closedir(struct inode *inode, struct file *filp) | |
127 | { | |
128 | put_nfs_open_dir_context(filp->private_data); | |
129 | return 0; | |
130 | } | |
131 | ||
d1bacf9e BS |
132 | struct nfs_cache_array_entry { |
133 | u64 cookie; | |
134 | u64 ino; | |
135 | struct qstr string; | |
0b26a0bf | 136 | unsigned char d_type; |
d1bacf9e BS |
137 | }; |
138 | ||
139 | struct nfs_cache_array { | |
88b8e133 | 140 | int size; |
d1bacf9e BS |
141 | int eof_index; |
142 | u64 last_cookie; | |
143 | struct nfs_cache_array_entry array[0]; | |
144 | }; | |
145 | ||
573c4e1e | 146 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
147 | typedef struct { |
148 | struct file *file; | |
149 | struct page *page; | |
23db8620 | 150 | struct dir_context *ctx; |
1da177e4 | 151 | unsigned long page_index; |
f0dd2136 | 152 | u64 *dir_cookie; |
0aded708 | 153 | u64 last_cookie; |
f0dd2136 | 154 | loff_t current_index; |
1da177e4 | 155 | decode_dirent_t decode; |
d1bacf9e | 156 | |
1f4eab7e | 157 | unsigned long timestamp; |
4704f0e2 | 158 | unsigned long gencount; |
d1bacf9e BS |
159 | unsigned int cache_entry_index; |
160 | unsigned int plus:1; | |
161 | unsigned int eof:1; | |
1da177e4 LT |
162 | } nfs_readdir_descriptor_t; |
163 | ||
d1bacf9e BS |
164 | /* |
165 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
166 | */ |
167 | static | |
d1bacf9e BS |
168 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
169 | { | |
8cd51a0c | 170 | void *ptr; |
d1bacf9e BS |
171 | if (page == NULL) |
172 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
173 | ptr = kmap(page); |
174 | if (ptr == NULL) | |
175 | return ERR_PTR(-ENOMEM); | |
176 | return ptr; | |
d1bacf9e BS |
177 | } |
178 | ||
179 | static | |
180 | void nfs_readdir_release_array(struct page *page) | |
181 | { | |
182 | kunmap(page); | |
183 | } | |
184 | ||
185 | /* | |
186 | * we are freeing strings created by nfs_add_to_readdir_array() | |
187 | */ | |
188 | static | |
11de3b11 | 189 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 190 | { |
11de3b11 | 191 | struct nfs_cache_array *array; |
d1bacf9e | 192 | int i; |
8cd51a0c | 193 | |
2b86ce2d | 194 | array = kmap_atomic(page); |
d1bacf9e BS |
195 | for (i = 0; i < array->size; i++) |
196 | kfree(array->array[i].string.name); | |
2b86ce2d | 197 | kunmap_atomic(array); |
d1bacf9e BS |
198 | } |
199 | ||
200 | /* | |
201 | * the caller is responsible for freeing qstr.name | |
202 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
203 | * nfs_clear_readdir_array() | |
204 | */ | |
205 | static | |
4a201d6e | 206 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
207 | { |
208 | string->len = len; | |
209 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
210 | if (string->name == NULL) |
211 | return -ENOMEM; | |
04e4bd1c CM |
212 | /* |
213 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
214 | * in a page cache page which kmemleak does not scan. | |
215 | */ | |
216 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
217 | string->hash = full_name_hash(name, len); |
218 | return 0; | |
d1bacf9e BS |
219 | } |
220 | ||
221 | static | |
222 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
223 | { | |
224 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
225 | struct nfs_cache_array_entry *cache_entry; |
226 | int ret; | |
227 | ||
d1bacf9e BS |
228 | if (IS_ERR(array)) |
229 | return PTR_ERR(array); | |
3020093f TM |
230 | |
231 | cache_entry = &array->array[array->size]; | |
232 | ||
233 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 234 | ret = -ENOSPC; |
3020093f | 235 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 236 | goto out; |
d1bacf9e | 237 | |
4a201d6e TM |
238 | cache_entry->cookie = entry->prev_cookie; |
239 | cache_entry->ino = entry->ino; | |
0b26a0bf | 240 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
241 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
242 | if (ret) | |
243 | goto out; | |
d1bacf9e | 244 | array->last_cookie = entry->cookie; |
8cd51a0c | 245 | array->size++; |
47c716cb | 246 | if (entry->eof != 0) |
d1bacf9e | 247 | array->eof_index = array->size; |
4a201d6e | 248 | out: |
d1bacf9e | 249 | nfs_readdir_release_array(page); |
4a201d6e | 250 | return ret; |
d1bacf9e BS |
251 | } |
252 | ||
253 | static | |
254 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
255 | { | |
23db8620 | 256 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
257 | unsigned int index; |
258 | ||
259 | if (diff < 0) | |
260 | goto out_eof; | |
261 | if (diff >= array->size) { | |
8cd51a0c | 262 | if (array->eof_index >= 0) |
d1bacf9e | 263 | goto out_eof; |
d1bacf9e BS |
264 | return -EAGAIN; |
265 | } | |
266 | ||
267 | index = (unsigned int)diff; | |
268 | *desc->dir_cookie = array->array[index].cookie; | |
269 | desc->cache_entry_index = index; | |
d1bacf9e BS |
270 | return 0; |
271 | out_eof: | |
272 | desc->eof = 1; | |
273 | return -EBADCOOKIE; | |
274 | } | |
275 | ||
276 | static | |
277 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
278 | { | |
279 | int i; | |
8ef2ce3e | 280 | loff_t new_pos; |
d1bacf9e BS |
281 | int status = -EAGAIN; |
282 | ||
283 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 284 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 285 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
286 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
287 | ||
8ef2ce3e | 288 | new_pos = desc->current_index + i; |
0c030806 TM |
289 | if (ctx->attr_gencount != nfsi->attr_gencount |
290 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
291 | ctx->duped = 0; | |
292 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 293 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
294 | if (ctx->duped > 0 |
295 | && ctx->dup_cookie == *desc->dir_cookie) { | |
296 | if (printk_ratelimit()) { | |
297 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
298 | "Please contact your server vendor. " | |
374e4e3e | 299 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
300 | desc->file->f_dentry->d_parent->d_name.name, |
301 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 302 | array->array[i].string.name, |
0c030806 TM |
303 | *desc->dir_cookie); |
304 | } | |
305 | status = -ELOOP; | |
306 | goto out; | |
307 | } | |
8ef2ce3e | 308 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 309 | ctx->duped = -1; |
8ef2ce3e | 310 | } |
23db8620 | 311 | desc->ctx->pos = new_pos; |
d1bacf9e | 312 | desc->cache_entry_index = i; |
47c716cb | 313 | return 0; |
d1bacf9e BS |
314 | } |
315 | } | |
47c716cb | 316 | if (array->eof_index >= 0) { |
8cd51a0c | 317 | status = -EBADCOOKIE; |
18fb5fe4 TM |
318 | if (*desc->dir_cookie == array->last_cookie) |
319 | desc->eof = 1; | |
8cd51a0c | 320 | } |
0c030806 | 321 | out: |
d1bacf9e BS |
322 | return status; |
323 | } | |
324 | ||
325 | static | |
326 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
327 | { | |
328 | struct nfs_cache_array *array; | |
47c716cb | 329 | int status; |
d1bacf9e BS |
330 | |
331 | array = nfs_readdir_get_array(desc->page); | |
332 | if (IS_ERR(array)) { | |
333 | status = PTR_ERR(array); | |
334 | goto out; | |
335 | } | |
336 | ||
337 | if (*desc->dir_cookie == 0) | |
338 | status = nfs_readdir_search_for_pos(array, desc); | |
339 | else | |
340 | status = nfs_readdir_search_for_cookie(array, desc); | |
341 | ||
47c716cb | 342 | if (status == -EAGAIN) { |
0aded708 | 343 | desc->last_cookie = array->last_cookie; |
e47c085a | 344 | desc->current_index += array->size; |
47c716cb TM |
345 | desc->page_index++; |
346 | } | |
d1bacf9e BS |
347 | nfs_readdir_release_array(desc->page); |
348 | out: | |
349 | return status; | |
350 | } | |
351 | ||
352 | /* Fill a page with xdr information before transferring to the cache page */ | |
353 | static | |
56e4ebf8 | 354 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 355 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 356 | { |
480c2006 BS |
357 | struct nfs_open_dir_context *ctx = file->private_data; |
358 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 359 | unsigned long timestamp, gencount; |
1da177e4 LT |
360 | int error; |
361 | ||
1da177e4 LT |
362 | again: |
363 | timestamp = jiffies; | |
4704f0e2 | 364 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 365 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
366 | NFS_SERVER(inode)->dtsize, desc->plus); |
367 | if (error < 0) { | |
368 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
369 | if (error == -ENOTSUPP && desc->plus) { | |
370 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 371 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
372 | desc->plus = 0; |
373 | goto again; | |
374 | } | |
375 | goto error; | |
376 | } | |
1f4eab7e | 377 | desc->timestamp = timestamp; |
4704f0e2 | 378 | desc->gencount = gencount; |
d1bacf9e BS |
379 | error: |
380 | return error; | |
1da177e4 LT |
381 | } |
382 | ||
573c4e1e CL |
383 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
384 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 385 | { |
573c4e1e | 386 | int error; |
1da177e4 | 387 | |
573c4e1e CL |
388 | error = desc->decode(xdr, entry, desc->plus); |
389 | if (error) | |
390 | return error; | |
d1bacf9e BS |
391 | entry->fattr->time_start = desc->timestamp; |
392 | entry->fattr->gencount = desc->gencount; | |
393 | return 0; | |
1da177e4 LT |
394 | } |
395 | ||
d39ab9de BS |
396 | static |
397 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
398 | { | |
d39ab9de BS |
399 | if (dentry->d_inode == NULL) |
400 | goto different; | |
37a09f07 | 401 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
402 | goto different; |
403 | return 1; | |
404 | different: | |
405 | return 0; | |
406 | } | |
407 | ||
d69ee9b8 | 408 | static |
23db8620 | 409 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
410 | { |
411 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
412 | return false; | |
413 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
414 | return true; | |
23db8620 | 415 | if (ctx->pos == 0) |
d69ee9b8 TM |
416 | return true; |
417 | return false; | |
418 | } | |
419 | ||
420 | /* | |
421 | * This function is called by the lookup code to request the use of | |
422 | * readdirplus to accelerate any future lookups in the same | |
423 | * directory. | |
424 | */ | |
425 | static | |
426 | void nfs_advise_use_readdirplus(struct inode *dir) | |
427 | { | |
428 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
429 | } | |
430 | ||
d39ab9de BS |
431 | static |
432 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
433 | { | |
26fe5750 | 434 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
435 | struct dentry *dentry; |
436 | struct dentry *alias; | |
d39ab9de BS |
437 | struct inode *dir = parent->d_inode; |
438 | struct inode *inode; | |
439 | ||
4a201d6e TM |
440 | if (filename.name[0] == '.') { |
441 | if (filename.len == 1) | |
442 | return; | |
443 | if (filename.len == 2 && filename.name[1] == '.') | |
444 | return; | |
445 | } | |
446 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 447 | |
4a201d6e | 448 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
449 | if (dentry != NULL) { |
450 | if (nfs_same_file(dentry, entry)) { | |
451 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
452 | goto out; | |
453 | } else { | |
696199f8 AV |
454 | if (d_invalidate(dentry) != 0) |
455 | goto out; | |
d39ab9de BS |
456 | dput(dentry); |
457 | } | |
458 | } | |
459 | ||
460 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
461 | if (dentry == NULL) |
462 | return; | |
463 | ||
d39ab9de BS |
464 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
465 | if (IS_ERR(inode)) | |
466 | goto out; | |
467 | ||
468 | alias = d_materialise_unique(dentry, inode); | |
469 | if (IS_ERR(alias)) | |
470 | goto out; | |
471 | else if (alias) { | |
472 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
473 | dput(alias); | |
474 | } else | |
475 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
476 | ||
477 | out: | |
478 | dput(dentry); | |
d39ab9de BS |
479 | } |
480 | ||
d1bacf9e BS |
481 | /* Perform conversion from xdr to cache array */ |
482 | static | |
8cd51a0c | 483 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 484 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 485 | { |
babddc72 | 486 | struct xdr_stream stream; |
f7da7a12 | 487 | struct xdr_buf buf; |
6650239a | 488 | struct page *scratch; |
99424380 | 489 | struct nfs_cache_array *array; |
5c346854 TM |
490 | unsigned int count = 0; |
491 | int status; | |
babddc72 | 492 | |
6650239a TM |
493 | scratch = alloc_page(GFP_KERNEL); |
494 | if (scratch == NULL) | |
495 | return -ENOMEM; | |
babddc72 | 496 | |
f7da7a12 | 497 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 498 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
499 | |
500 | do { | |
501 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
502 | if (status != 0) { |
503 | if (status == -EAGAIN) | |
504 | status = 0; | |
99424380 | 505 | break; |
8cd51a0c | 506 | } |
99424380 | 507 | |
5c346854 TM |
508 | count++; |
509 | ||
47c716cb | 510 | if (desc->plus != 0) |
d39ab9de | 511 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
512 | |
513 | status = nfs_readdir_add_to_array(entry, page); | |
514 | if (status != 0) | |
515 | break; | |
99424380 BS |
516 | } while (!entry->eof); |
517 | ||
47c716cb | 518 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 519 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
520 | if (!IS_ERR(array)) { |
521 | array->eof_index = array->size; | |
522 | status = 0; | |
523 | nfs_readdir_release_array(page); | |
5c346854 TM |
524 | } else |
525 | status = PTR_ERR(array); | |
1da177e4 | 526 | } |
6650239a TM |
527 | |
528 | put_page(scratch); | |
8cd51a0c | 529 | return status; |
56e4ebf8 BS |
530 | } |
531 | ||
532 | static | |
533 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
534 | { | |
535 | unsigned int i; | |
536 | for (i = 0; i < npages; i++) | |
537 | put_page(pages[i]); | |
538 | } | |
539 | ||
540 | static | |
541 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
542 | unsigned int npages) | |
543 | { | |
56e4ebf8 BS |
544 | nfs_readdir_free_pagearray(pages, npages); |
545 | } | |
546 | ||
547 | /* | |
548 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
549 | * to nfs_readdir_free_large_page | |
550 | */ | |
551 | static | |
6650239a | 552 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 553 | { |
56e4ebf8 BS |
554 | unsigned int i; |
555 | ||
556 | for (i = 0; i < npages; i++) { | |
557 | struct page *page = alloc_page(GFP_KERNEL); | |
558 | if (page == NULL) | |
559 | goto out_freepages; | |
560 | pages[i] = page; | |
561 | } | |
6650239a | 562 | return 0; |
56e4ebf8 | 563 | |
56e4ebf8 BS |
564 | out_freepages: |
565 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 566 | return -ENOMEM; |
1da177e4 LT |
567 | } |
568 | ||
d1bacf9e BS |
569 | static |
570 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 571 | { |
56e4ebf8 BS |
572 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
573 | void *pages_ptr = NULL; | |
d1bacf9e BS |
574 | struct nfs_entry entry; |
575 | struct file *file = desc->file; | |
576 | struct nfs_cache_array *array; | |
8cd51a0c | 577 | int status = -ENOMEM; |
56e4ebf8 | 578 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
579 | |
580 | entry.prev_cookie = 0; | |
0aded708 | 581 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
582 | entry.eof = 0; |
583 | entry.fh = nfs_alloc_fhandle(); | |
584 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 585 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
586 | if (entry.fh == NULL || entry.fattr == NULL) |
587 | goto out; | |
00a92642 | 588 | |
d1bacf9e | 589 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
590 | if (IS_ERR(array)) { |
591 | status = PTR_ERR(array); | |
592 | goto out; | |
593 | } | |
d1bacf9e BS |
594 | memset(array, 0, sizeof(struct nfs_cache_array)); |
595 | array->eof_index = -1; | |
00a92642 | 596 | |
6650239a TM |
597 | status = nfs_readdir_large_page(pages, array_size); |
598 | if (status < 0) | |
d1bacf9e BS |
599 | goto out_release_array; |
600 | do { | |
ac396128 | 601 | unsigned int pglen; |
56e4ebf8 | 602 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 603 | |
d1bacf9e | 604 | if (status < 0) |
00a92642 | 605 | break; |
ac396128 | 606 | pglen = status; |
6650239a | 607 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
608 | if (status < 0) { |
609 | if (status == -ENOSPC) | |
610 | status = 0; | |
611 | break; | |
612 | } | |
613 | } while (array->eof_index < 0); | |
d1bacf9e | 614 | |
56e4ebf8 | 615 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
616 | out_release_array: |
617 | nfs_readdir_release_array(page); | |
618 | out: | |
619 | nfs_free_fattr(entry.fattr); | |
620 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
621 | return status; |
622 | } | |
623 | ||
624 | /* | |
d1bacf9e BS |
625 | * Now we cache directories properly, by converting xdr information |
626 | * to an array that can be used for lookups later. This results in | |
627 | * fewer cache pages, since we can store more information on each page. | |
628 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 629 | */ |
d1bacf9e BS |
630 | static |
631 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 632 | { |
496ad9aa | 633 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 634 | int ret; |
1da177e4 | 635 | |
8cd51a0c TM |
636 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
637 | if (ret < 0) | |
d1bacf9e BS |
638 | goto error; |
639 | SetPageUptodate(page); | |
1da177e4 | 640 | |
d1bacf9e BS |
641 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
642 | /* Should never happen */ | |
643 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 644 | } |
d1bacf9e BS |
645 | unlock_page(page); |
646 | return 0; | |
647 | error: | |
648 | unlock_page(page); | |
8cd51a0c | 649 | return ret; |
d1bacf9e | 650 | } |
1da177e4 | 651 | |
d1bacf9e BS |
652 | static |
653 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
654 | { | |
11de3b11 TM |
655 | if (!desc->page->mapping) |
656 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
657 | page_cache_release(desc->page); |
658 | desc->page = NULL; | |
659 | } | |
660 | ||
661 | static | |
662 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
663 | { | |
496ad9aa | 664 | return read_cache_page(file_inode(desc->file)->i_mapping, |
d1bacf9e | 665 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
666 | } |
667 | ||
668 | /* | |
d1bacf9e | 669 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 670 | */ |
d1bacf9e BS |
671 | static |
672 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
673 | { | |
674 | int res; | |
675 | ||
676 | desc->page = get_cache_page(desc); | |
677 | if (IS_ERR(desc->page)) | |
678 | return PTR_ERR(desc->page); | |
679 | ||
680 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
681 | if (res != 0) |
682 | cache_page_release(desc); | |
d1bacf9e BS |
683 | return res; |
684 | } | |
685 | ||
686 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
687 | static inline |
688 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
689 | { | |
8cd51a0c | 690 | int res; |
d1bacf9e | 691 | |
0aded708 | 692 | if (desc->page_index == 0) { |
8cd51a0c | 693 | desc->current_index = 0; |
0aded708 TM |
694 | desc->last_cookie = 0; |
695 | } | |
47c716cb | 696 | do { |
d1bacf9e | 697 | res = find_cache_page(desc); |
47c716cb | 698 | } while (res == -EAGAIN); |
1da177e4 LT |
699 | return res; |
700 | } | |
701 | ||
1da177e4 LT |
702 | /* |
703 | * Once we've found the start of the dirent within a page: fill 'er up... | |
704 | */ | |
705 | static | |
23db8620 | 706 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
707 | { |
708 | struct file *file = desc->file; | |
d1bacf9e BS |
709 | int i = 0; |
710 | int res = 0; | |
711 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
712 | struct nfs_open_dir_context *ctx = file->private_data; |
713 | ||
d1bacf9e | 714 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
715 | if (IS_ERR(array)) { |
716 | res = PTR_ERR(array); | |
717 | goto out; | |
718 | } | |
d1bacf9e BS |
719 | |
720 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 721 | struct nfs_cache_array_entry *ent; |
1da177e4 | 722 | |
ece0b423 | 723 | ent = &array->array[i]; |
23db8620 AV |
724 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
725 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 726 | desc->eof = 1; |
1da177e4 | 727 | break; |
ece0b423 | 728 | } |
23db8620 | 729 | desc->ctx->pos++; |
d1bacf9e BS |
730 | if (i < (array->size-1)) |
731 | *desc->dir_cookie = array->array[i+1].cookie; | |
732 | else | |
733 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
734 | if (ctx->duped != 0) |
735 | ctx->duped = 1; | |
1da177e4 | 736 | } |
47c716cb | 737 | if (array->eof_index >= 0) |
8cd51a0c | 738 | desc->eof = 1; |
d1bacf9e BS |
739 | |
740 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 741 | out: |
d1bacf9e | 742 | cache_page_release(desc); |
1e7cb3dc CL |
743 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
744 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
745 | return res; |
746 | } | |
747 | ||
748 | /* | |
749 | * If we cannot find a cookie in our cache, we suspect that this is | |
750 | * because it points to a deleted file, so we ask the server to return | |
751 | * whatever it thinks is the next entry. We then feed this to filldir. | |
752 | * If all goes well, we should then be able to find our way round the | |
753 | * cache on the next call to readdir_search_pagecache(); | |
754 | * | |
755 | * NOTE: we cannot add the anonymous page to the pagecache because | |
756 | * the data it contains might not be page aligned. Besides, | |
757 | * we should already have a complete representation of the | |
758 | * directory in the page cache by the time we get here. | |
759 | */ | |
760 | static inline | |
23db8620 | 761 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 762 | { |
1da177e4 LT |
763 | struct page *page = NULL; |
764 | int status; | |
496ad9aa | 765 | struct inode *inode = file_inode(desc->file); |
0c030806 | 766 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 767 | |
1e7cb3dc CL |
768 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
769 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
770 | |
771 | page = alloc_page(GFP_HIGHUSER); | |
772 | if (!page) { | |
773 | status = -ENOMEM; | |
774 | goto out; | |
775 | } | |
d1bacf9e | 776 | |
7a8e1dc3 | 777 | desc->page_index = 0; |
0aded708 | 778 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 779 | desc->page = page; |
0c030806 | 780 | ctx->duped = 0; |
7a8e1dc3 | 781 | |
85f8607e TM |
782 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
783 | if (status < 0) | |
1da177e4 LT |
784 | goto out_release; |
785 | ||
23db8620 | 786 | status = nfs_do_filldir(desc); |
1da177e4 | 787 | |
1da177e4 | 788 | out: |
1e7cb3dc | 789 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 790 | __func__, status); |
1da177e4 LT |
791 | return status; |
792 | out_release: | |
d1bacf9e | 793 | cache_page_release(desc); |
1da177e4 LT |
794 | goto out; |
795 | } | |
796 | ||
00a92642 OG |
797 | /* The file offset position represents the dirent entry number. A |
798 | last cookie cache takes care of the common case of reading the | |
799 | whole directory. | |
1da177e4 | 800 | */ |
23db8620 | 801 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 802 | { |
23db8620 | 803 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
804 | struct inode *inode = dentry->d_inode; |
805 | nfs_readdir_descriptor_t my_desc, | |
806 | *desc = &my_desc; | |
23db8620 | 807 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
47c716cb | 808 | int res; |
1da177e4 | 809 | |
6da24bc9 | 810 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc | 811 | dentry->d_parent->d_name.name, dentry->d_name.name, |
23db8620 | 812 | (long long)ctx->pos); |
91d5b470 CL |
813 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
814 | ||
1da177e4 | 815 | /* |
23db8620 | 816 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 817 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
818 | * to either find the entry with the appropriate number or |
819 | * revalidate the cookie. | |
1da177e4 LT |
820 | */ |
821 | memset(desc, 0, sizeof(*desc)); | |
822 | ||
23db8620 AV |
823 | desc->file = file; |
824 | desc->ctx = ctx; | |
480c2006 | 825 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 826 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 827 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 828 | |
565277f6 | 829 | nfs_block_sillyrename(dentry); |
23db8620 | 830 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
fccca7fc TM |
831 | if (res < 0) |
832 | goto out; | |
833 | ||
47c716cb | 834 | do { |
1da177e4 | 835 | res = readdir_search_pagecache(desc); |
00a92642 | 836 | |
1da177e4 | 837 | if (res == -EBADCOOKIE) { |
ece0b423 | 838 | res = 0; |
1da177e4 | 839 | /* This means either end of directory */ |
d1bacf9e | 840 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 841 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 842 | res = uncached_readdir(desc); |
ece0b423 | 843 | if (res == 0) |
1da177e4 LT |
844 | continue; |
845 | } | |
1da177e4 LT |
846 | break; |
847 | } | |
848 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 849 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 850 | nfs_zap_caches(inode); |
baf57a09 | 851 | desc->page_index = 0; |
1da177e4 | 852 | desc->plus = 0; |
d1bacf9e | 853 | desc->eof = 0; |
1da177e4 LT |
854 | continue; |
855 | } | |
856 | if (res < 0) | |
857 | break; | |
858 | ||
23db8620 | 859 | res = nfs_do_filldir(desc); |
ece0b423 | 860 | if (res < 0) |
1da177e4 | 861 | break; |
47c716cb | 862 | } while (!desc->eof); |
fccca7fc | 863 | out: |
565277f6 | 864 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
865 | if (res > 0) |
866 | res = 0; | |
aa49b4cf | 867 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
868 | dentry->d_parent->d_name.name, dentry->d_name.name, |
869 | res); | |
870 | return res; | |
1da177e4 LT |
871 | } |
872 | ||
965c8e59 | 873 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 874 | { |
b84e06c5 CL |
875 | struct dentry *dentry = filp->f_path.dentry; |
876 | struct inode *inode = dentry->d_inode; | |
480c2006 | 877 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 878 | |
6da24bc9 | 879 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
880 | dentry->d_parent->d_name.name, |
881 | dentry->d_name.name, | |
965c8e59 | 882 | offset, whence); |
b84e06c5 CL |
883 | |
884 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 885 | switch (whence) { |
f0dd2136 TM |
886 | case 1: |
887 | offset += filp->f_pos; | |
888 | case 0: | |
889 | if (offset >= 0) | |
890 | break; | |
891 | default: | |
892 | offset = -EINVAL; | |
893 | goto out; | |
894 | } | |
895 | if (offset != filp->f_pos) { | |
896 | filp->f_pos = offset; | |
480c2006 | 897 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 898 | dir_ctx->duped = 0; |
f0dd2136 TM |
899 | } |
900 | out: | |
b84e06c5 | 901 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
902 | return offset; |
903 | } | |
904 | ||
1da177e4 LT |
905 | /* |
906 | * All directory operations under NFS are synchronous, so fsync() | |
907 | * is a dummy operation. | |
908 | */ | |
02c24a82 JB |
909 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
910 | int datasync) | |
1da177e4 | 911 | { |
7ea80859 | 912 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 913 | struct inode *inode = dentry->d_inode; |
7ea80859 | 914 | |
6da24bc9 | 915 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
916 | dentry->d_parent->d_name.name, dentry->d_name.name, |
917 | datasync); | |
918 | ||
02c24a82 | 919 | mutex_lock(&inode->i_mutex); |
54917786 | 920 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 921 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
922 | return 0; |
923 | } | |
924 | ||
bfc69a45 TM |
925 | /** |
926 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
927 | * @dir - pointer to directory inode | |
928 | * | |
929 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
930 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
931 | * on the server that might have invalidated our dcache. | |
932 | * | |
933 | * The caller should be holding dir->i_lock | |
934 | */ | |
935 | void nfs_force_lookup_revalidate(struct inode *dir) | |
936 | { | |
011935a0 | 937 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 938 | } |
89d77c8f | 939 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 940 | |
1da177e4 LT |
941 | /* |
942 | * A check for whether or not the parent directory has changed. | |
943 | * In the case it has, we assume that the dentries are untrustworthy | |
944 | * and may need to be looked up again. | |
945 | */ | |
c79ba787 | 946 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
947 | { |
948 | if (IS_ROOT(dentry)) | |
949 | return 1; | |
4eec952e TM |
950 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
951 | return 0; | |
f2c77f4e TM |
952 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
953 | return 0; | |
954 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
955 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
956 | return 0; | |
957 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
958 | return 0; | |
959 | return 1; | |
1da177e4 LT |
960 | } |
961 | ||
a12802ca TM |
962 | /* |
963 | * Use intent information to check whether or not we're going to do | |
964 | * an O_EXCL create using this path component. | |
965 | */ | |
fa3c56bb | 966 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
967 | { |
968 | if (NFS_PROTO(dir)->version == 2) | |
969 | return 0; | |
fa3c56bb | 970 | return flags & LOOKUP_EXCL; |
a12802ca TM |
971 | } |
972 | ||
1d6757fb TM |
973 | /* |
974 | * Inode and filehandle revalidation for lookups. | |
975 | * | |
976 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
977 | * or if the intent information indicates that we're about to open this | |
978 | * particular file and the "nocto" mount flag is not set. | |
979 | * | |
980 | */ | |
65a0c149 | 981 | static |
fa3c56bb | 982 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
983 | { |
984 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 985 | int ret; |
1da177e4 | 986 | |
36d43a43 | 987 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 988 | return 0; |
facc3530 | 989 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 990 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
991 | goto out_force; |
992 | /* This is an open(2) */ | |
fa3c56bb AV |
993 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
994 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 995 | goto out_force; |
65a0c149 TM |
996 | out: |
997 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 998 | out_force: |
65a0c149 TM |
999 | ret = __nfs_revalidate_inode(server, inode); |
1000 | if (ret != 0) | |
1001 | return ret; | |
1002 | goto out; | |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | /* | |
1006 | * We judge how long we want to trust negative | |
1007 | * dentries by looking at the parent inode mtime. | |
1008 | * | |
1009 | * If parent mtime has changed, we revalidate, else we wait for a | |
1010 | * period corresponding to the parent's attribute cache timeout value. | |
1011 | */ | |
1012 | static inline | |
1013 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1014 | unsigned int flags) |
1da177e4 | 1015 | { |
1da177e4 | 1016 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1017 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1018 | return 0; |
4eec952e TM |
1019 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1020 | return 1; | |
1da177e4 LT |
1021 | return !nfs_check_verifier(dir, dentry); |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * This is called every time the dcache has a lookup hit, | |
1026 | * and we should check whether we can really trust that | |
1027 | * lookup. | |
1028 | * | |
1029 | * NOTE! The hit can be a negative hit too, don't assume | |
1030 | * we have an inode! | |
1031 | * | |
1032 | * If the parent directory is seen to have changed, we throw out the | |
1033 | * cached dentry and do a new lookup. | |
1034 | */ | |
0b728e19 | 1035 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1036 | { |
1037 | struct inode *dir; | |
1038 | struct inode *inode; | |
1039 | struct dentry *parent; | |
e1fb4d05 TM |
1040 | struct nfs_fh *fhandle = NULL; |
1041 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1042 | int error; |
1da177e4 | 1043 | |
fa3c56bb | 1044 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1045 | return -ECHILD; |
1046 | ||
1da177e4 | 1047 | parent = dget_parent(dentry); |
1da177e4 | 1048 | dir = parent->d_inode; |
91d5b470 | 1049 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1050 | inode = dentry->d_inode; |
1051 | ||
1052 | if (!inode) { | |
fa3c56bb | 1053 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1054 | goto out_bad; |
d69ee9b8 | 1055 | goto out_valid_noent; |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1059 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1060 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1061 | dentry->d_name.name); |
1da177e4 LT |
1062 | goto out_bad; |
1063 | } | |
1064 | ||
011e2a7f | 1065 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1066 | goto out_set_verifier; |
1067 | ||
1da177e4 | 1068 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1069 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1070 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1071 | goto out_zap_parent; |
1072 | goto out_valid; | |
1073 | } | |
1074 | ||
1075 | if (NFS_STALE(inode)) | |
1076 | goto out_bad; | |
1077 | ||
e1fb4d05 TM |
1078 | error = -ENOMEM; |
1079 | fhandle = nfs_alloc_fhandle(); | |
1080 | fattr = nfs_alloc_fattr(); | |
1081 | if (fhandle == NULL || fattr == NULL) | |
1082 | goto out_error; | |
1083 | ||
80a16b21 | 1084 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1085 | if (error) |
1086 | goto out_bad; | |
e1fb4d05 | 1087 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1088 | goto out_bad; |
e1fb4d05 | 1089 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1090 | goto out_bad; |
1091 | ||
e1fb4d05 TM |
1092 | nfs_free_fattr(fattr); |
1093 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1094 | out_set_verifier: |
cf8ba45e | 1095 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1096 | out_valid: |
d69ee9b8 TM |
1097 | /* Success: notify readdir to use READDIRPLUS */ |
1098 | nfs_advise_use_readdirplus(dir); | |
1099 | out_valid_noent: | |
1da177e4 | 1100 | dput(parent); |
1e7cb3dc | 1101 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1102 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1103 | dentry->d_name.name); |
1da177e4 LT |
1104 | return 1; |
1105 | out_zap_parent: | |
1106 | nfs_zap_caches(dir); | |
1107 | out_bad: | |
c44600c9 AV |
1108 | nfs_free_fattr(fattr); |
1109 | nfs_free_fhandle(fhandle); | |
a1643a92 | 1110 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1111 | if (inode && S_ISDIR(inode->i_mode)) { |
1112 | /* Purge readdir caches. */ | |
1113 | nfs_zap_caches(inode); | |
1114 | /* If we have submounts, don't unhash ! */ | |
1115 | if (have_submounts(dentry)) | |
1116 | goto out_valid; | |
d9e80b7d AV |
1117 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1118 | goto out_valid; | |
1da177e4 LT |
1119 | shrink_dcache_parent(dentry); |
1120 | } | |
1121 | d_drop(dentry); | |
1da177e4 | 1122 | dput(parent); |
1e7cb3dc | 1123 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1124 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1125 | dentry->d_name.name); |
1da177e4 | 1126 | return 0; |
e1fb4d05 TM |
1127 | out_error: |
1128 | nfs_free_fattr(fattr); | |
1129 | nfs_free_fhandle(fhandle); | |
1130 | dput(parent); | |
1131 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1132 | __func__, dentry->d_parent->d_name.name, | |
1133 | dentry->d_name.name, error); | |
1134 | return error; | |
1da177e4 LT |
1135 | } |
1136 | ||
ecf3d1f1 JL |
1137 | /* |
1138 | * A weaker form of d_revalidate for revalidating just the dentry->d_inode | |
1139 | * when we don't really care about the dentry name. This is called when a | |
1140 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1141 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1142 | * | |
1143 | * In this situation, we just want to verify that the inode itself is OK | |
1144 | * since the dentry might have changed on the server. | |
1145 | */ | |
1146 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1147 | { | |
1148 | int error; | |
1149 | struct inode *inode = dentry->d_inode; | |
1150 | ||
1151 | /* | |
1152 | * I believe we can only get a negative dentry here in the case of a | |
1153 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1154 | * eventually need to do something more here. | |
1155 | */ | |
1156 | if (!inode) { | |
1157 | dfprintk(LOOKUPCACHE, "%s: %s/%s has negative inode\n", | |
1158 | __func__, dentry->d_parent->d_name.name, | |
1159 | dentry->d_name.name); | |
1160 | return 1; | |
1161 | } | |
1162 | ||
1163 | if (is_bad_inode(inode)) { | |
1164 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", | |
1165 | __func__, dentry->d_parent->d_name.name, | |
1166 | dentry->d_name.name); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1171 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1172 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1173 | return !error; | |
1174 | } | |
1175 | ||
1da177e4 LT |
1176 | /* |
1177 | * This is called from dput() when d_count is going to 0. | |
1178 | */ | |
fe15ce44 | 1179 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1180 | { |
1181 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1182 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1183 | dentry->d_flags); | |
1184 | ||
77f11192 TM |
1185 | /* Unhash any dentry with a stale inode */ |
1186 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1187 | return 1; | |
1188 | ||
1da177e4 LT |
1189 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1190 | /* Unhash it, so that ->d_iput() would be called */ | |
1191 | return 1; | |
1192 | } | |
1193 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1194 | /* Unhash it, so that ancestors of killed async unlink | |
1195 | * files will be cleaned up during umount */ | |
1196 | return 1; | |
1197 | } | |
1198 | return 0; | |
1199 | ||
1200 | } | |
1201 | ||
1f018458 | 1202 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1203 | static void nfs_drop_nlink(struct inode *inode) |
1204 | { | |
1205 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1206 | /* drop the inode if we're reasonably sure this is the last link */ |
1207 | if (inode->i_nlink == 1) | |
1208 | clear_nlink(inode); | |
1209 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1210 | spin_unlock(&inode->i_lock); |
1211 | } | |
1212 | ||
1da177e4 LT |
1213 | /* |
1214 | * Called when the dentry loses inode. | |
1215 | * We use it to clean up silly-renamed files. | |
1216 | */ | |
1217 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1218 | { | |
83672d39 NB |
1219 | if (S_ISDIR(inode->i_mode)) |
1220 | /* drop any readdir cache as it could easily be old */ | |
1221 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1222 | ||
1da177e4 | 1223 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1224 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1225 | nfs_drop_nlink(inode); |
1da177e4 | 1226 | } |
1da177e4 LT |
1227 | iput(inode); |
1228 | } | |
1229 | ||
b1942c5f AV |
1230 | static void nfs_d_release(struct dentry *dentry) |
1231 | { | |
1232 | /* free cached devname value, if it survived that far */ | |
1233 | if (unlikely(dentry->d_fsdata)) { | |
1234 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1235 | WARN_ON(1); | |
1236 | else | |
1237 | kfree(dentry->d_fsdata); | |
1238 | } | |
1239 | } | |
1240 | ||
f786aa90 | 1241 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1242 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1243 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1244 | .d_delete = nfs_dentry_delete, |
1245 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1246 | .d_automount = nfs_d_automount, |
b1942c5f | 1247 | .d_release = nfs_d_release, |
1da177e4 | 1248 | }; |
ddda8e0a | 1249 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1250 | |
597d9289 | 1251 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1252 | { |
1253 | struct dentry *res; | |
565277f6 | 1254 | struct dentry *parent; |
1da177e4 | 1255 | struct inode *inode = NULL; |
e1fb4d05 TM |
1256 | struct nfs_fh *fhandle = NULL; |
1257 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1258 | int error; |
1da177e4 LT |
1259 | |
1260 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1261 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1262 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1263 | |
1264 | res = ERR_PTR(-ENAMETOOLONG); | |
1265 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1266 | goto out; | |
1267 | ||
fd684071 TM |
1268 | /* |
1269 | * If we're doing an exclusive create, optimize away the lookup | |
1270 | * but don't hash the dentry. | |
1271 | */ | |
00cd8dd3 | 1272 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1273 | d_instantiate(dentry, NULL); |
1274 | res = NULL; | |
fc0f684c | 1275 | goto out; |
fd684071 | 1276 | } |
1da177e4 | 1277 | |
e1fb4d05 TM |
1278 | res = ERR_PTR(-ENOMEM); |
1279 | fhandle = nfs_alloc_fhandle(); | |
1280 | fattr = nfs_alloc_fattr(); | |
1281 | if (fhandle == NULL || fattr == NULL) | |
1282 | goto out; | |
1283 | ||
565277f6 TM |
1284 | parent = dentry->d_parent; |
1285 | /* Protect against concurrent sillydeletes */ | |
1286 | nfs_block_sillyrename(parent); | |
80a16b21 | 1287 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1288 | if (error == -ENOENT) |
1289 | goto no_entry; | |
1290 | if (error < 0) { | |
1291 | res = ERR_PTR(error); | |
565277f6 | 1292 | goto out_unblock_sillyrename; |
1da177e4 | 1293 | } |
e1fb4d05 | 1294 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1295 | res = ERR_CAST(inode); |
03f28e3a | 1296 | if (IS_ERR(res)) |
565277f6 | 1297 | goto out_unblock_sillyrename; |
54ceac45 | 1298 | |
d69ee9b8 TM |
1299 | /* Success: notify readdir to use READDIRPLUS */ |
1300 | nfs_advise_use_readdirplus(dir); | |
1301 | ||
1da177e4 | 1302 | no_entry: |
54ceac45 | 1303 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1304 | if (res != NULL) { |
1305 | if (IS_ERR(res)) | |
565277f6 | 1306 | goto out_unblock_sillyrename; |
1da177e4 | 1307 | dentry = res; |
9eaef27b | 1308 | } |
1da177e4 | 1309 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1310 | out_unblock_sillyrename: |
1311 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1312 | out: |
e1fb4d05 TM |
1313 | nfs_free_fattr(fattr); |
1314 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1315 | return res; |
1316 | } | |
ddda8e0a | 1317 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1318 | |
89d77c8f | 1319 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1320 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1321 | |
f786aa90 | 1322 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1323 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1324 | .d_delete = nfs_dentry_delete, |
1325 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1326 | .d_automount = nfs_d_automount, |
b1942c5f | 1327 | .d_release = nfs_d_release, |
1da177e4 | 1328 | }; |
89d77c8f | 1329 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1330 | |
8a5e929d AV |
1331 | static fmode_t flags_to_mode(int flags) |
1332 | { | |
1333 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1334 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1335 | res |= FMODE_READ; | |
1336 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1337 | res |= FMODE_WRITE; | |
1338 | return res; | |
1339 | } | |
1340 | ||
51141598 | 1341 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1342 | { |
5ede7b1c | 1343 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1344 | } |
1345 | ||
1346 | static int do_open(struct inode *inode, struct file *filp) | |
1347 | { | |
1348 | nfs_fscache_set_inode_cookie(inode, filp); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
d9585277 AV |
1352 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1353 | struct dentry *dentry, | |
30d90494 | 1354 | struct file *file, unsigned open_flags, |
d9585277 | 1355 | int *opened) |
cd9a1c0e | 1356 | { |
0dd2b474 MS |
1357 | int err; |
1358 | ||
1359 | if (ctx->dentry != dentry) { | |
1360 | dput(ctx->dentry); | |
1361 | ctx->dentry = dget(dentry); | |
1362 | } | |
cd9a1c0e TM |
1363 | |
1364 | /* If the open_intent is for execute, we have an extra check to make */ | |
1365 | if (ctx->mode & FMODE_EXEC) { | |
0dd2b474 | 1366 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
d9585277 | 1367 | if (err < 0) |
cd9a1c0e TM |
1368 | goto out; |
1369 | } | |
0dd2b474 | 1370 | |
30d90494 AV |
1371 | err = finish_open(file, dentry, do_open, opened); |
1372 | if (err) | |
d9585277 | 1373 | goto out; |
30d90494 | 1374 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1375 | |
cd9a1c0e TM |
1376 | out: |
1377 | put_nfs_open_context(ctx); | |
d9585277 | 1378 | return err; |
cd9a1c0e TM |
1379 | } |
1380 | ||
73a79706 BS |
1381 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1382 | struct file *file, unsigned open_flags, | |
1383 | umode_t mode, int *opened) | |
1da177e4 | 1384 | { |
cd9a1c0e | 1385 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1386 | struct dentry *res; |
1387 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1388 | struct inode *inode; |
898f635c | 1389 | int err; |
1da177e4 | 1390 | |
0dd2b474 MS |
1391 | /* Expect a negative dentry */ |
1392 | BUG_ON(dentry->d_inode); | |
1393 | ||
1394 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1395 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1396 | ||
0dd2b474 MS |
1397 | /* NFS only supports OPEN on regular files */ |
1398 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1399 | if (!d_unhashed(dentry)) { |
1400 | /* | |
1401 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1402 | * revalidated and is fine, no need to perform lookup | |
1403 | * again | |
1404 | */ | |
d9585277 | 1405 | return -ENOENT; |
0dd2b474 | 1406 | } |
1da177e4 | 1407 | goto no_open; |
02a913a7 | 1408 | } |
1da177e4 | 1409 | |
0dd2b474 | 1410 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1411 | return -ENAMETOOLONG; |
cd9a1c0e | 1412 | |
0dd2b474 | 1413 | if (open_flags & O_CREAT) { |
536e43d1 | 1414 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1415 | attr.ia_mode = mode & ~current_umask(); |
1416 | } | |
536e43d1 TM |
1417 | if (open_flags & O_TRUNC) { |
1418 | attr.ia_valid |= ATTR_SIZE; | |
1419 | attr.ia_size = 0; | |
cd9a1c0e TM |
1420 | } |
1421 | ||
0dd2b474 MS |
1422 | ctx = create_nfs_open_context(dentry, open_flags); |
1423 | err = PTR_ERR(ctx); | |
1424 | if (IS_ERR(ctx)) | |
d9585277 | 1425 | goto out; |
0dd2b474 | 1426 | |
f46e0bd3 | 1427 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1428 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
0dd2b474 | 1429 | d_drop(dentry); |
f46e0bd3 TM |
1430 | if (IS_ERR(inode)) { |
1431 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1432 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1433 | err = PTR_ERR(inode); |
1434 | switch (err) { | |
1435 | case -ENOENT: | |
1436 | d_add(dentry, NULL); | |
1437 | break; | |
1438 | case -EISDIR: | |
1439 | case -ENOTDIR: | |
1440 | goto no_open; | |
1441 | case -ELOOP: | |
1442 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1443 | goto no_open; |
0dd2b474 | 1444 | break; |
1da177e4 | 1445 | /* case -EINVAL: */ |
0dd2b474 MS |
1446 | default: |
1447 | break; | |
1da177e4 | 1448 | } |
d9585277 | 1449 | goto out; |
cd9a1c0e | 1450 | } |
f46e0bd3 | 1451 | res = d_add_unique(dentry, inode); |
0dd2b474 | 1452 | if (res != NULL) |
1da177e4 | 1453 | dentry = res; |
0dd2b474 MS |
1454 | |
1455 | nfs_unblock_sillyrename(dentry->d_parent); | |
f46e0bd3 | 1456 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 | 1457 | |
30d90494 | 1458 | err = nfs_finish_open(ctx, dentry, file, open_flags, opened); |
0dd2b474 MS |
1459 | |
1460 | dput(res); | |
d9585277 AV |
1461 | out: |
1462 | return err; | |
0dd2b474 | 1463 | |
1da177e4 | 1464 | no_open: |
00cd8dd3 | 1465 | res = nfs_lookup(dir, dentry, 0); |
0dd2b474 MS |
1466 | err = PTR_ERR(res); |
1467 | if (IS_ERR(res)) | |
d9585277 | 1468 | goto out; |
0dd2b474 | 1469 | |
e45198a6 | 1470 | return finish_no_open(file, res); |
1da177e4 | 1471 | } |
89d77c8f | 1472 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1473 | |
0b728e19 | 1474 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1475 | { |
1476 | struct dentry *parent = NULL; | |
657e94b6 | 1477 | struct inode *inode; |
1da177e4 | 1478 | struct inode *dir; |
50de348c | 1479 | int ret = 0; |
1da177e4 | 1480 | |
fa3c56bb | 1481 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1482 | return -ECHILD; |
1483 | ||
fa3c56bb | 1484 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1485 | goto no_open; |
1486 | if (d_mountpoint(dentry)) | |
5584c306 | 1487 | goto no_open; |
49f9a0fa TM |
1488 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1489 | goto no_open; | |
2b484297 | 1490 | |
eda72afb | 1491 | inode = dentry->d_inode; |
1da177e4 LT |
1492 | parent = dget_parent(dentry); |
1493 | dir = parent->d_inode; | |
2b484297 | 1494 | |
1da177e4 LT |
1495 | /* We can't create new files in nfs_open_revalidate(), so we |
1496 | * optimize away revalidation of negative dentries. | |
1497 | */ | |
216d5d06 | 1498 | if (inode == NULL) { |
fa3c56bb | 1499 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1500 | ret = 1; |
1da177e4 | 1501 | goto out; |
216d5d06 TM |
1502 | } |
1503 | ||
1da177e4 LT |
1504 | /* NFS only supports OPEN on regular files */ |
1505 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1506 | goto no_open_dput; |
1da177e4 | 1507 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1508 | if (flags & LOOKUP_EXCL) |
5584c306 | 1509 | goto no_open_dput; |
1da177e4 | 1510 | |
0ef97dcf MS |
1511 | /* Let f_op->open() actually open (and revalidate) the file */ |
1512 | ret = 1; | |
536e43d1 | 1513 | |
1da177e4 LT |
1514 | out: |
1515 | dput(parent); | |
1da177e4 | 1516 | return ret; |
535918f1 | 1517 | |
5584c306 | 1518 | no_open_dput: |
1da177e4 | 1519 | dput(parent); |
5584c306 | 1520 | no_open: |
0b728e19 | 1521 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1522 | } |
1523 | ||
1da177e4 LT |
1524 | #endif /* CONFIG_NFSV4 */ |
1525 | ||
1da177e4 LT |
1526 | /* |
1527 | * Code common to create, mkdir, and mknod. | |
1528 | */ | |
1529 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1530 | struct nfs_fattr *fattr) | |
1531 | { | |
fab728e1 TM |
1532 | struct dentry *parent = dget_parent(dentry); |
1533 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1534 | struct inode *inode; |
1535 | int error = -EACCES; | |
1536 | ||
fab728e1 TM |
1537 | d_drop(dentry); |
1538 | ||
1da177e4 LT |
1539 | /* We may have been initialized further down */ |
1540 | if (dentry->d_inode) | |
fab728e1 | 1541 | goto out; |
1da177e4 | 1542 | if (fhandle->size == 0) { |
80a16b21 | 1543 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1544 | if (error) |
fab728e1 | 1545 | goto out_error; |
1da177e4 | 1546 | } |
5724ab37 | 1547 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1548 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1549 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1550 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1551 | if (error < 0) |
fab728e1 | 1552 | goto out_error; |
1da177e4 | 1553 | } |
1da177e4 | 1554 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1555 | error = PTR_ERR(inode); |
1556 | if (IS_ERR(inode)) | |
fab728e1 TM |
1557 | goto out_error; |
1558 | d_add(dentry, inode); | |
1559 | out: | |
1560 | dput(parent); | |
1da177e4 | 1561 | return 0; |
fab728e1 TM |
1562 | out_error: |
1563 | nfs_mark_for_revalidate(dir); | |
1564 | dput(parent); | |
1565 | return error; | |
1da177e4 | 1566 | } |
ddda8e0a | 1567 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1568 | |
1569 | /* | |
1570 | * Following a failed create operation, we drop the dentry rather | |
1571 | * than retain a negative dentry. This avoids a problem in the event | |
1572 | * that the operation succeeded on the server, but an error in the | |
1573 | * reply path made it appear to have failed. | |
1574 | */ | |
597d9289 | 1575 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1576 | umode_t mode, bool excl) |
1da177e4 LT |
1577 | { |
1578 | struct iattr attr; | |
ebfc3b49 | 1579 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1580 | int error; |
1da177e4 | 1581 | |
1e7cb3dc CL |
1582 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1583 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1584 | |
1585 | attr.ia_mode = mode; | |
1586 | attr.ia_valid = ATTR_MODE; | |
1587 | ||
8867fe58 | 1588 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1589 | if (error != 0) |
1590 | goto out_err; | |
1da177e4 LT |
1591 | return 0; |
1592 | out_err: | |
1da177e4 LT |
1593 | d_drop(dentry); |
1594 | return error; | |
1595 | } | |
ddda8e0a | 1596 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1597 | |
1598 | /* | |
1599 | * See comments for nfs_proc_create regarding failed operations. | |
1600 | */ | |
597d9289 | 1601 | int |
1a67aafb | 1602 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1603 | { |
1604 | struct iattr attr; | |
1605 | int status; | |
1606 | ||
1e7cb3dc CL |
1607 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1608 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1609 | |
1610 | if (!new_valid_dev(rdev)) | |
1611 | return -EINVAL; | |
1612 | ||
1613 | attr.ia_mode = mode; | |
1614 | attr.ia_valid = ATTR_MODE; | |
1615 | ||
1da177e4 | 1616 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1617 | if (status != 0) |
1618 | goto out_err; | |
1da177e4 LT |
1619 | return 0; |
1620 | out_err: | |
1da177e4 LT |
1621 | d_drop(dentry); |
1622 | return status; | |
1623 | } | |
ddda8e0a | 1624 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1625 | |
1626 | /* | |
1627 | * See comments for nfs_proc_create regarding failed operations. | |
1628 | */ | |
597d9289 | 1629 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1630 | { |
1631 | struct iattr attr; | |
1632 | int error; | |
1633 | ||
1e7cb3dc CL |
1634 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1635 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1636 | |
1637 | attr.ia_valid = ATTR_MODE; | |
1638 | attr.ia_mode = mode | S_IFDIR; | |
1639 | ||
1da177e4 | 1640 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1641 | if (error != 0) |
1642 | goto out_err; | |
1da177e4 LT |
1643 | return 0; |
1644 | out_err: | |
1645 | d_drop(dentry); | |
1da177e4 LT |
1646 | return error; |
1647 | } | |
ddda8e0a | 1648 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1649 | |
d45b9d8b TM |
1650 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1651 | { | |
1652 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1653 | d_delete(dentry); | |
1654 | } | |
1655 | ||
597d9289 | 1656 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1657 | { |
1658 | int error; | |
1659 | ||
1e7cb3dc CL |
1660 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1661 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1662 | |
1da177e4 LT |
1663 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1664 | /* Ensure the VFS deletes this inode */ | |
1665 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1666 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1667 | else if (error == -ENOENT) |
1668 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1669 | |
1670 | return error; | |
1671 | } | |
ddda8e0a | 1672 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1673 | |
1da177e4 LT |
1674 | /* |
1675 | * Remove a file after making sure there are no pending writes, | |
1676 | * and after checking that the file has only one user. | |
1677 | * | |
1678 | * We invalidate the attribute cache and free the inode prior to the operation | |
1679 | * to avoid possible races if the server reuses the inode. | |
1680 | */ | |
1681 | static int nfs_safe_remove(struct dentry *dentry) | |
1682 | { | |
1683 | struct inode *dir = dentry->d_parent->d_inode; | |
1684 | struct inode *inode = dentry->d_inode; | |
1685 | int error = -EBUSY; | |
1686 | ||
1687 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1688 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1689 | ||
1690 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1691 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1692 | error = 0; | |
1693 | goto out; | |
1694 | } | |
1695 | ||
1da177e4 | 1696 | if (inode != NULL) { |
57ec14c5 | 1697 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1698 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1699 | if (error == 0) |
1b83d707 | 1700 | nfs_drop_nlink(inode); |
1da177e4 LT |
1701 | } else |
1702 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1703 | if (error == -ENOENT) |
1704 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1705 | out: |
1706 | return error; | |
1707 | } | |
1708 | ||
1709 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1710 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1711 | * | |
1712 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1713 | */ | |
597d9289 | 1714 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1715 | { |
1716 | int error; | |
1717 | int need_rehash = 0; | |
1718 | ||
1719 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1720 | dir->i_ino, dentry->d_name.name); | |
1721 | ||
1da177e4 | 1722 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1723 | if (dentry->d_count > 1) { |
1da177e4 | 1724 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1725 | /* Start asynchronous writeout of the inode */ |
1726 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1727 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1728 | return error; |
1729 | } | |
1730 | if (!d_unhashed(dentry)) { | |
1731 | __d_drop(dentry); | |
1732 | need_rehash = 1; | |
1733 | } | |
1734 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1735 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1736 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1737 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1738 | } else if (need_rehash) | |
1739 | d_rehash(dentry); | |
1da177e4 LT |
1740 | return error; |
1741 | } | |
ddda8e0a | 1742 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1743 | |
873101b3 CL |
1744 | /* |
1745 | * To create a symbolic link, most file systems instantiate a new inode, | |
1746 | * add a page to it containing the path, then write it out to the disk | |
1747 | * using prepare_write/commit_write. | |
1748 | * | |
1749 | * Unfortunately the NFS client can't create the in-core inode first | |
1750 | * because it needs a file handle to create an in-core inode (see | |
1751 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1752 | * symlink request has completed on the server. | |
1753 | * | |
1754 | * So instead we allocate a raw page, copy the symname into it, then do | |
1755 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1756 | * now have a new file handle and can instantiate an in-core NFS inode | |
1757 | * and move the raw page into its mapping. | |
1758 | */ | |
597d9289 | 1759 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1760 | { |
873101b3 CL |
1761 | struct pagevec lru_pvec; |
1762 | struct page *page; | |
1763 | char *kaddr; | |
1da177e4 | 1764 | struct iattr attr; |
873101b3 | 1765 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1766 | int error; |
1767 | ||
1768 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1769 | dir->i_ino, dentry->d_name.name, symname); | |
1770 | ||
873101b3 CL |
1771 | if (pathlen > PAGE_SIZE) |
1772 | return -ENAMETOOLONG; | |
1da177e4 | 1773 | |
873101b3 CL |
1774 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1775 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1776 | |
83d93f22 | 1777 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1778 | if (!page) |
873101b3 | 1779 | return -ENOMEM; |
873101b3 | 1780 | |
2b86ce2d | 1781 | kaddr = kmap_atomic(page); |
873101b3 CL |
1782 | memcpy(kaddr, symname, pathlen); |
1783 | if (pathlen < PAGE_SIZE) | |
1784 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1785 | kunmap_atomic(kaddr); |
873101b3 | 1786 | |
94a6d753 | 1787 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1788 | if (error != 0) { |
1789 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1790 | dir->i_sb->s_id, dir->i_ino, | |
1791 | dentry->d_name.name, symname, error); | |
1da177e4 | 1792 | d_drop(dentry); |
873101b3 | 1793 | __free_page(page); |
873101b3 CL |
1794 | return error; |
1795 | } | |
1796 | ||
1797 | /* | |
1798 | * No big deal if we can't add this page to the page cache here. | |
1799 | * READLINK will get the missing page from the server if needed. | |
1800 | */ | |
1801 | pagevec_init(&lru_pvec, 0); | |
1802 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1803 | GFP_KERNEL)) { | |
39cf8a13 | 1804 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1805 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1806 | SetPageUptodate(page); |
1807 | unlock_page(page); | |
1808 | } else | |
1809 | __free_page(page); | |
1810 | ||
873101b3 | 1811 | return 0; |
1da177e4 | 1812 | } |
ddda8e0a | 1813 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1814 | |
597d9289 | 1815 | int |
1da177e4 LT |
1816 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1817 | { | |
1818 | struct inode *inode = old_dentry->d_inode; | |
1819 | int error; | |
1820 | ||
1821 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1822 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1823 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1824 | ||
57ec14c5 | 1825 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1826 | |
9697d234 | 1827 | d_drop(dentry); |
1da177e4 | 1828 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1829 | if (error == 0) { |
7de9c6ee | 1830 | ihold(inode); |
9697d234 | 1831 | d_add(dentry, inode); |
cf809556 | 1832 | } |
1da177e4 LT |
1833 | return error; |
1834 | } | |
ddda8e0a | 1835 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1836 | |
1837 | /* | |
1838 | * RENAME | |
1839 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1840 | * different file handle for the same inode after a rename (e.g. when | |
1841 | * moving to a different directory). A fail-safe method to do so would | |
1842 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1843 | * rename the old file using the sillyrename stuff. This way, the original | |
1844 | * file in old_dir will go away when the last process iput()s the inode. | |
1845 | * | |
1846 | * FIXED. | |
1847 | * | |
1848 | * It actually works quite well. One needs to have the possibility for | |
1849 | * at least one ".nfs..." file in each directory the file ever gets | |
1850 | * moved or linked to which happens automagically with the new | |
1851 | * implementation that only depends on the dcache stuff instead of | |
1852 | * using the inode layer | |
1853 | * | |
1854 | * Unfortunately, things are a little more complicated than indicated | |
1855 | * above. For a cross-directory move, we want to make sure we can get | |
1856 | * rid of the old inode after the operation. This means there must be | |
1857 | * no pending writes (if it's a file), and the use count must be 1. | |
1858 | * If these conditions are met, we can drop the dentries before doing | |
1859 | * the rename. | |
1860 | */ | |
597d9289 | 1861 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1862 | struct inode *new_dir, struct dentry *new_dentry) |
1863 | { | |
1864 | struct inode *old_inode = old_dentry->d_inode; | |
1865 | struct inode *new_inode = new_dentry->d_inode; | |
1866 | struct dentry *dentry = NULL, *rehash = NULL; | |
1867 | int error = -EBUSY; | |
1868 | ||
1da177e4 LT |
1869 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1870 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1871 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1872 | new_dentry->d_count); |
1da177e4 LT |
1873 | |
1874 | /* | |
28f79a1a MS |
1875 | * For non-directories, check whether the target is busy and if so, |
1876 | * make a copy of the dentry and then do a silly-rename. If the | |
1877 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1878 | * the new target. | |
1da177e4 | 1879 | */ |
27226104 MS |
1880 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1881 | /* | |
1882 | * To prevent any new references to the target during the | |
1883 | * rename, we unhash the dentry in advance. | |
1884 | */ | |
1885 | if (!d_unhashed(new_dentry)) { | |
1886 | d_drop(new_dentry); | |
1887 | rehash = new_dentry; | |
1888 | } | |
1da177e4 | 1889 | |
b7ab39f6 | 1890 | if (new_dentry->d_count > 2) { |
27226104 MS |
1891 | int err; |
1892 | ||
1893 | /* copy the target dentry's name */ | |
1894 | dentry = d_alloc(new_dentry->d_parent, | |
1895 | &new_dentry->d_name); | |
1896 | if (!dentry) | |
1897 | goto out; | |
1898 | ||
1899 | /* silly-rename the existing target ... */ | |
1900 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1901 | if (err) |
27226104 | 1902 | goto out; |
24e93025 MS |
1903 | |
1904 | new_dentry = dentry; | |
56335936 | 1905 | rehash = NULL; |
24e93025 | 1906 | new_inode = NULL; |
27226104 | 1907 | } |
b1e4adf4 | 1908 | } |
1da177e4 | 1909 | |
57ec14c5 | 1910 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1911 | if (new_inode != NULL) |
57ec14c5 | 1912 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1913 | |
1da177e4 LT |
1914 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1915 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1916 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1917 | out: |
1918 | if (rehash) | |
1919 | d_rehash(rehash); | |
1920 | if (!error) { | |
b1e4adf4 TM |
1921 | if (new_inode != NULL) |
1922 | nfs_drop_nlink(new_inode); | |
349457cc | 1923 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1924 | nfs_set_verifier(new_dentry, |
1925 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1926 | } else if (error == -ENOENT) |
1927 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1928 | |
1929 | /* new dentry created? */ | |
1930 | if (dentry) | |
1931 | dput(dentry); | |
1da177e4 LT |
1932 | return error; |
1933 | } | |
ddda8e0a | 1934 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 1935 | |
cfcea3e8 TM |
1936 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1937 | static LIST_HEAD(nfs_access_lru_list); | |
1938 | static atomic_long_t nfs_access_nr_entries; | |
1939 | ||
1c3c07e9 TM |
1940 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1941 | { | |
1942 | put_rpccred(entry->cred); | |
1943 | kfree(entry); | |
cfcea3e8 TM |
1944 | smp_mb__before_atomic_dec(); |
1945 | atomic_long_dec(&nfs_access_nr_entries); | |
1946 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1947 | } |
1948 | ||
1a81bb8a TM |
1949 | static void nfs_access_free_list(struct list_head *head) |
1950 | { | |
1951 | struct nfs_access_entry *cache; | |
1952 | ||
1953 | while (!list_empty(head)) { | |
1954 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1955 | list_del(&cache->lru); | |
1956 | nfs_access_free_entry(cache); | |
1957 | } | |
1958 | } | |
1959 | ||
1495f230 YH |
1960 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
1961 | struct shrink_control *sc) | |
979df72e TM |
1962 | { |
1963 | LIST_HEAD(head); | |
aa510da5 | 1964 | struct nfs_inode *nfsi, *next; |
979df72e | 1965 | struct nfs_access_entry *cache; |
1495f230 YH |
1966 | int nr_to_scan = sc->nr_to_scan; |
1967 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 1968 | |
61d5eb29 TM |
1969 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1970 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1971 | |
a50f7951 | 1972 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1973 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1974 | struct inode *inode; |
1975 | ||
1976 | if (nr_to_scan-- == 0) | |
1977 | break; | |
9c7e7e23 | 1978 | inode = &nfsi->vfs_inode; |
979df72e TM |
1979 | spin_lock(&inode->i_lock); |
1980 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1981 | goto remove_lru_entry; | |
1982 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1983 | struct nfs_access_entry, lru); | |
1984 | list_move(&cache->lru, &head); | |
1985 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1986 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1987 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1988 | &nfs_access_lru_list); | |
1989 | else { | |
1990 | remove_lru_entry: | |
1991 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1992 | smp_mb__before_clear_bit(); |
979df72e | 1993 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1994 | smp_mb__after_clear_bit(); |
979df72e | 1995 | } |
59844a9b | 1996 | spin_unlock(&inode->i_lock); |
979df72e TM |
1997 | } |
1998 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1999 | nfs_access_free_list(&head); |
979df72e TM |
2000 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2001 | } | |
2002 | ||
1a81bb8a | 2003 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2004 | { |
1c3c07e9 | 2005 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2006 | struct rb_node *n; |
1c3c07e9 TM |
2007 | struct nfs_access_entry *entry; |
2008 | ||
2009 | /* Unhook entries from the cache */ | |
2010 | while ((n = rb_first(root_node)) != NULL) { | |
2011 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2012 | rb_erase(n, root_node); | |
1a81bb8a | 2013 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2014 | } |
2015 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2016 | } |
2017 | ||
1c3c07e9 | 2018 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2019 | { |
1a81bb8a TM |
2020 | LIST_HEAD(head); |
2021 | ||
2022 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2023 | return; | |
cfcea3e8 | 2024 | /* Remove from global LRU init */ |
1a81bb8a TM |
2025 | spin_lock(&nfs_access_lru_lock); |
2026 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2027 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2028 | |
1c3c07e9 | 2029 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2030 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2031 | spin_unlock(&inode->i_lock); | |
2032 | spin_unlock(&nfs_access_lru_lock); | |
2033 | nfs_access_free_list(&head); | |
1c3c07e9 | 2034 | } |
1c606fb7 | 2035 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2036 | |
1c3c07e9 TM |
2037 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2038 | { | |
2039 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2040 | struct nfs_access_entry *entry; | |
2041 | ||
2042 | while (n != NULL) { | |
2043 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2044 | ||
2045 | if (cred < entry->cred) | |
2046 | n = n->rb_left; | |
2047 | else if (cred > entry->cred) | |
2048 | n = n->rb_right; | |
2049 | else | |
2050 | return entry; | |
1da177e4 | 2051 | } |
1c3c07e9 TM |
2052 | return NULL; |
2053 | } | |
2054 | ||
af22f94a | 2055 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2056 | { |
2057 | struct nfs_inode *nfsi = NFS_I(inode); | |
2058 | struct nfs_access_entry *cache; | |
2059 | int err = -ENOENT; | |
2060 | ||
dc59250c | 2061 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2062 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2063 | goto out_zap; | |
2064 | cache = nfs_access_search_rbtree(inode, cred); | |
2065 | if (cache == NULL) | |
2066 | goto out; | |
b4d2314b | 2067 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2068 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2069 | goto out_stale; |
2070 | res->jiffies = cache->jiffies; | |
2071 | res->cred = cache->cred; | |
2072 | res->mask = cache->mask; | |
cfcea3e8 | 2073 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2074 | err = 0; |
2075 | out: | |
2076 | spin_unlock(&inode->i_lock); | |
2077 | return err; | |
2078 | out_stale: | |
2079 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2080 | list_del(&cache->lru); |
1c3c07e9 TM |
2081 | spin_unlock(&inode->i_lock); |
2082 | nfs_access_free_entry(cache); | |
2083 | return -ENOENT; | |
2084 | out_zap: | |
1a81bb8a TM |
2085 | spin_unlock(&inode->i_lock); |
2086 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2087 | return -ENOENT; |
2088 | } | |
2089 | ||
2090 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2091 | { | |
cfcea3e8 TM |
2092 | struct nfs_inode *nfsi = NFS_I(inode); |
2093 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2094 | struct rb_node **p = &root_node->rb_node; |
2095 | struct rb_node *parent = NULL; | |
2096 | struct nfs_access_entry *entry; | |
2097 | ||
2098 | spin_lock(&inode->i_lock); | |
2099 | while (*p != NULL) { | |
2100 | parent = *p; | |
2101 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2102 | ||
2103 | if (set->cred < entry->cred) | |
2104 | p = &parent->rb_left; | |
2105 | else if (set->cred > entry->cred) | |
2106 | p = &parent->rb_right; | |
2107 | else | |
2108 | goto found; | |
2109 | } | |
2110 | rb_link_node(&set->rb_node, parent, p); | |
2111 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2112 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2113 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2114 | return; |
2115 | found: | |
2116 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2117 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2118 | list_del(&entry->lru); | |
1c3c07e9 TM |
2119 | spin_unlock(&inode->i_lock); |
2120 | nfs_access_free_entry(entry); | |
2121 | } | |
2122 | ||
6168f62c | 2123 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2124 | { |
2125 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2126 | if (cache == NULL) | |
2127 | return; | |
2128 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2129 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2130 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2131 | cache->mask = set->mask; |
1c3c07e9 TM |
2132 | |
2133 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2134 | |
2135 | /* Update accounting */ | |
2136 | smp_mb__before_atomic_inc(); | |
2137 | atomic_long_inc(&nfs_access_nr_entries); | |
2138 | smp_mb__after_atomic_inc(); | |
2139 | ||
2140 | /* Add inode to global LRU list */ | |
1a81bb8a | 2141 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2142 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2143 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2144 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2145 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2146 | spin_unlock(&nfs_access_lru_lock); |
2147 | } | |
1da177e4 | 2148 | } |
6168f62c WAA |
2149 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2150 | ||
2151 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2152 | { | |
2153 | entry->mask = 0; | |
2154 | if (access_result & NFS4_ACCESS_READ) | |
2155 | entry->mask |= MAY_READ; | |
2156 | if (access_result & | |
2157 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2158 | entry->mask |= MAY_WRITE; | |
2159 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2160 | entry->mask |= MAY_EXEC; | |
2161 | } | |
2162 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2163 | |
2164 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2165 | { | |
2166 | struct nfs_access_entry cache; | |
2167 | int status; | |
2168 | ||
2169 | status = nfs_access_get_cached(inode, cred, &cache); | |
2170 | if (status == 0) | |
2171 | goto out; | |
2172 | ||
2173 | /* Be clever: ask server to check for all possible rights */ | |
2174 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2175 | cache.cred = cred; | |
2176 | cache.jiffies = jiffies; | |
2177 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2178 | if (status != 0) { |
2179 | if (status == -ESTALE) { | |
2180 | nfs_zap_caches(inode); | |
2181 | if (!S_ISDIR(inode->i_mode)) | |
2182 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2183 | } | |
1da177e4 | 2184 | return status; |
a71ee337 | 2185 | } |
1da177e4 LT |
2186 | nfs_access_add_cache(inode, &cache); |
2187 | out: | |
e6305c43 | 2188 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2189 | return 0; |
2190 | return -EACCES; | |
2191 | } | |
2192 | ||
af22f94a TM |
2193 | static int nfs_open_permission_mask(int openflags) |
2194 | { | |
2195 | int mask = 0; | |
2196 | ||
f8d9a897 WAA |
2197 | if (openflags & __FMODE_EXEC) { |
2198 | /* ONLY check exec rights */ | |
2199 | mask = MAY_EXEC; | |
2200 | } else { | |
2201 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2202 | mask |= MAY_READ; | |
2203 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2204 | mask |= MAY_WRITE; | |
2205 | } | |
2206 | ||
af22f94a TM |
2207 | return mask; |
2208 | } | |
2209 | ||
2210 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2211 | { | |
2212 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2213 | } | |
89d77c8f | 2214 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2215 | |
10556cb2 | 2216 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2217 | { |
2218 | struct rpc_cred *cred; | |
2219 | int res = 0; | |
2220 | ||
10556cb2 | 2221 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2222 | return -ECHILD; |
2223 | ||
91d5b470 CL |
2224 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2225 | ||
e6305c43 | 2226 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2227 | goto out; |
2228 | /* Is this sys_access() ? */ | |
9cfcac81 | 2229 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2230 | goto force_lookup; |
2231 | ||
2232 | switch (inode->i_mode & S_IFMT) { | |
2233 | case S_IFLNK: | |
2234 | goto out; | |
2235 | case S_IFREG: | |
2236 | /* NFSv4 has atomic_open... */ | |
2237 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2238 | && (mask & MAY_OPEN) |
2239 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2240 | goto out; |
2241 | break; | |
2242 | case S_IFDIR: | |
2243 | /* | |
2244 | * Optimize away all write operations, since the server | |
2245 | * will check permissions when we perform the op. | |
2246 | */ | |
2247 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2248 | goto out; | |
2249 | } | |
2250 | ||
2251 | force_lookup: | |
1da177e4 LT |
2252 | if (!NFS_PROTO(inode)->access) |
2253 | goto out_notsup; | |
2254 | ||
98a8e323 | 2255 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2256 | if (!IS_ERR(cred)) { |
2257 | res = nfs_do_access(inode, cred, mask); | |
2258 | put_rpccred(cred); | |
2259 | } else | |
2260 | res = PTR_ERR(cred); | |
1da177e4 | 2261 | out: |
f696a365 MS |
2262 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2263 | res = -EACCES; | |
2264 | ||
1e7cb3dc CL |
2265 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2266 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2267 | return res; |
2268 | out_notsup: | |
2269 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2270 | if (res == 0) | |
2830ba7f | 2271 | res = generic_permission(inode, mask); |
1e7cb3dc | 2272 | goto out; |
1da177e4 | 2273 | } |
ddda8e0a | 2274 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2275 | |
2276 | /* | |
2277 | * Local variables: | |
2278 | * version-control: t | |
2279 | * kept-new-versions: 5 | |
2280 | * End: | |
2281 | */ |