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 *); |
1da177e4 | 49 | static int nfs_readdir(struct file *, void *, filldir_t); |
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 LT |
56 | .read = generic_read_dir, |
57 | .readdir = nfs_readdir, | |
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; | |
150 | unsigned long page_index; | |
f0dd2136 | 151 | u64 *dir_cookie; |
0aded708 | 152 | u64 last_cookie; |
f0dd2136 | 153 | loff_t current_index; |
1da177e4 | 154 | decode_dirent_t decode; |
d1bacf9e | 155 | |
1f4eab7e | 156 | unsigned long timestamp; |
4704f0e2 | 157 | unsigned long gencount; |
d1bacf9e BS |
158 | unsigned int cache_entry_index; |
159 | unsigned int plus:1; | |
160 | unsigned int eof:1; | |
1da177e4 LT |
161 | } nfs_readdir_descriptor_t; |
162 | ||
d1bacf9e BS |
163 | /* |
164 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
165 | */ |
166 | static | |
d1bacf9e BS |
167 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
168 | { | |
8cd51a0c | 169 | void *ptr; |
d1bacf9e BS |
170 | if (page == NULL) |
171 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
172 | ptr = kmap(page); |
173 | if (ptr == NULL) | |
174 | return ERR_PTR(-ENOMEM); | |
175 | return ptr; | |
d1bacf9e BS |
176 | } |
177 | ||
178 | static | |
179 | void nfs_readdir_release_array(struct page *page) | |
180 | { | |
181 | kunmap(page); | |
182 | } | |
183 | ||
184 | /* | |
185 | * we are freeing strings created by nfs_add_to_readdir_array() | |
186 | */ | |
187 | static | |
11de3b11 | 188 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 189 | { |
11de3b11 | 190 | struct nfs_cache_array *array; |
d1bacf9e | 191 | int i; |
8cd51a0c | 192 | |
2b86ce2d | 193 | array = kmap_atomic(page); |
d1bacf9e BS |
194 | for (i = 0; i < array->size; i++) |
195 | kfree(array->array[i].string.name); | |
2b86ce2d | 196 | kunmap_atomic(array); |
d1bacf9e BS |
197 | } |
198 | ||
199 | /* | |
200 | * the caller is responsible for freeing qstr.name | |
201 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
202 | * nfs_clear_readdir_array() | |
203 | */ | |
204 | static | |
4a201d6e | 205 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
206 | { |
207 | string->len = len; | |
208 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
209 | if (string->name == NULL) |
210 | return -ENOMEM; | |
04e4bd1c CM |
211 | /* |
212 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
213 | * in a page cache page which kmemleak does not scan. | |
214 | */ | |
215 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
216 | string->hash = full_name_hash(name, len); |
217 | return 0; | |
d1bacf9e BS |
218 | } |
219 | ||
220 | static | |
221 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
222 | { | |
223 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
224 | struct nfs_cache_array_entry *cache_entry; |
225 | int ret; | |
226 | ||
d1bacf9e BS |
227 | if (IS_ERR(array)) |
228 | return PTR_ERR(array); | |
3020093f TM |
229 | |
230 | cache_entry = &array->array[array->size]; | |
231 | ||
232 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 233 | ret = -ENOSPC; |
3020093f | 234 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 235 | goto out; |
d1bacf9e | 236 | |
4a201d6e TM |
237 | cache_entry->cookie = entry->prev_cookie; |
238 | cache_entry->ino = entry->ino; | |
0b26a0bf | 239 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
240 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
241 | if (ret) | |
242 | goto out; | |
d1bacf9e | 243 | array->last_cookie = entry->cookie; |
8cd51a0c | 244 | array->size++; |
47c716cb | 245 | if (entry->eof != 0) |
d1bacf9e | 246 | array->eof_index = array->size; |
4a201d6e | 247 | out: |
d1bacf9e | 248 | nfs_readdir_release_array(page); |
4a201d6e | 249 | return ret; |
d1bacf9e BS |
250 | } |
251 | ||
252 | static | |
253 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
254 | { | |
255 | loff_t diff = desc->file->f_pos - desc->current_index; | |
256 | unsigned int index; | |
257 | ||
258 | if (diff < 0) | |
259 | goto out_eof; | |
260 | if (diff >= array->size) { | |
8cd51a0c | 261 | if (array->eof_index >= 0) |
d1bacf9e | 262 | goto out_eof; |
d1bacf9e BS |
263 | return -EAGAIN; |
264 | } | |
265 | ||
266 | index = (unsigned int)diff; | |
267 | *desc->dir_cookie = array->array[index].cookie; | |
268 | desc->cache_entry_index = index; | |
d1bacf9e BS |
269 | return 0; |
270 | out_eof: | |
271 | desc->eof = 1; | |
272 | return -EBADCOOKIE; | |
273 | } | |
274 | ||
275 | static | |
276 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
277 | { | |
278 | int i; | |
8ef2ce3e | 279 | loff_t new_pos; |
d1bacf9e BS |
280 | int status = -EAGAIN; |
281 | ||
282 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 283 | if (array->array[i].cookie == *desc->dir_cookie) { |
0c030806 TM |
284 | struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode); |
285 | struct nfs_open_dir_context *ctx = desc->file->private_data; | |
286 | ||
8ef2ce3e | 287 | new_pos = desc->current_index + i; |
0c030806 TM |
288 | if (ctx->attr_gencount != nfsi->attr_gencount |
289 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
290 | ctx->duped = 0; | |
291 | ctx->attr_gencount = nfsi->attr_gencount; | |
292 | } else if (new_pos < desc->file->f_pos) { | |
293 | if (ctx->duped > 0 | |
294 | && ctx->dup_cookie == *desc->dir_cookie) { | |
295 | if (printk_ratelimit()) { | |
296 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
297 | "Please contact your server vendor. " | |
374e4e3e | 298 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
299 | desc->file->f_dentry->d_parent->d_name.name, |
300 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 301 | array->array[i].string.name, |
0c030806 TM |
302 | *desc->dir_cookie); |
303 | } | |
304 | status = -ELOOP; | |
305 | goto out; | |
306 | } | |
8ef2ce3e | 307 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 308 | ctx->duped = -1; |
8ef2ce3e BS |
309 | } |
310 | desc->file->f_pos = new_pos; | |
d1bacf9e | 311 | desc->cache_entry_index = i; |
47c716cb | 312 | return 0; |
d1bacf9e BS |
313 | } |
314 | } | |
47c716cb | 315 | if (array->eof_index >= 0) { |
8cd51a0c | 316 | status = -EBADCOOKIE; |
18fb5fe4 TM |
317 | if (*desc->dir_cookie == array->last_cookie) |
318 | desc->eof = 1; | |
8cd51a0c | 319 | } |
0c030806 | 320 | out: |
d1bacf9e BS |
321 | return status; |
322 | } | |
323 | ||
324 | static | |
325 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
326 | { | |
327 | struct nfs_cache_array *array; | |
47c716cb | 328 | int status; |
d1bacf9e BS |
329 | |
330 | array = nfs_readdir_get_array(desc->page); | |
331 | if (IS_ERR(array)) { | |
332 | status = PTR_ERR(array); | |
333 | goto out; | |
334 | } | |
335 | ||
336 | if (*desc->dir_cookie == 0) | |
337 | status = nfs_readdir_search_for_pos(array, desc); | |
338 | else | |
339 | status = nfs_readdir_search_for_cookie(array, desc); | |
340 | ||
47c716cb | 341 | if (status == -EAGAIN) { |
0aded708 | 342 | desc->last_cookie = array->last_cookie; |
e47c085a | 343 | desc->current_index += array->size; |
47c716cb TM |
344 | desc->page_index++; |
345 | } | |
d1bacf9e BS |
346 | nfs_readdir_release_array(desc->page); |
347 | out: | |
348 | return status; | |
349 | } | |
350 | ||
351 | /* Fill a page with xdr information before transferring to the cache page */ | |
352 | static | |
56e4ebf8 | 353 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 354 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 355 | { |
480c2006 BS |
356 | struct nfs_open_dir_context *ctx = file->private_data; |
357 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 358 | unsigned long timestamp, gencount; |
1da177e4 LT |
359 | int error; |
360 | ||
1da177e4 LT |
361 | again: |
362 | timestamp = jiffies; | |
4704f0e2 | 363 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 364 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
365 | NFS_SERVER(inode)->dtsize, desc->plus); |
366 | if (error < 0) { | |
367 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
368 | if (error == -ENOTSUPP && desc->plus) { | |
369 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 370 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
371 | desc->plus = 0; |
372 | goto again; | |
373 | } | |
374 | goto error; | |
375 | } | |
1f4eab7e | 376 | desc->timestamp = timestamp; |
4704f0e2 | 377 | desc->gencount = gencount; |
d1bacf9e BS |
378 | error: |
379 | return error; | |
1da177e4 LT |
380 | } |
381 | ||
573c4e1e CL |
382 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
383 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 384 | { |
573c4e1e | 385 | int error; |
1da177e4 | 386 | |
573c4e1e CL |
387 | error = desc->decode(xdr, entry, desc->plus); |
388 | if (error) | |
389 | return error; | |
d1bacf9e BS |
390 | entry->fattr->time_start = desc->timestamp; |
391 | entry->fattr->gencount = desc->gencount; | |
392 | return 0; | |
1da177e4 LT |
393 | } |
394 | ||
d39ab9de BS |
395 | static |
396 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
397 | { | |
d39ab9de BS |
398 | if (dentry->d_inode == NULL) |
399 | goto different; | |
37a09f07 | 400 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
401 | goto different; |
402 | return 1; | |
403 | different: | |
404 | return 0; | |
405 | } | |
406 | ||
d69ee9b8 TM |
407 | static |
408 | bool nfs_use_readdirplus(struct inode *dir, struct file *filp) | |
409 | { | |
410 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
411 | return false; | |
412 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
413 | return true; | |
414 | if (filp->f_pos == 0) | |
415 | return true; | |
416 | return false; | |
417 | } | |
418 | ||
419 | /* | |
420 | * This function is called by the lookup code to request the use of | |
421 | * readdirplus to accelerate any future lookups in the same | |
422 | * directory. | |
423 | */ | |
424 | static | |
425 | void nfs_advise_use_readdirplus(struct inode *dir) | |
426 | { | |
427 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
428 | } | |
429 | ||
d39ab9de BS |
430 | static |
431 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
432 | { | |
26fe5750 | 433 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
434 | struct dentry *dentry; |
435 | struct dentry *alias; | |
d39ab9de BS |
436 | struct inode *dir = parent->d_inode; |
437 | struct inode *inode; | |
438 | ||
4a201d6e TM |
439 | if (filename.name[0] == '.') { |
440 | if (filename.len == 1) | |
441 | return; | |
442 | if (filename.len == 2 && filename.name[1] == '.') | |
443 | return; | |
444 | } | |
445 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 446 | |
4a201d6e | 447 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
448 | if (dentry != NULL) { |
449 | if (nfs_same_file(dentry, entry)) { | |
450 | nfs_refresh_inode(dentry->d_inode, entry->fattr); | |
451 | goto out; | |
452 | } else { | |
453 | d_drop(dentry); | |
454 | dput(dentry); | |
455 | } | |
456 | } | |
457 | ||
458 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
459 | if (dentry == NULL) |
460 | return; | |
461 | ||
d39ab9de BS |
462 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
463 | if (IS_ERR(inode)) | |
464 | goto out; | |
465 | ||
466 | alias = d_materialise_unique(dentry, inode); | |
467 | if (IS_ERR(alias)) | |
468 | goto out; | |
469 | else if (alias) { | |
470 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
471 | dput(alias); | |
472 | } else | |
473 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
474 | ||
475 | out: | |
476 | dput(dentry); | |
d39ab9de BS |
477 | } |
478 | ||
d1bacf9e BS |
479 | /* Perform conversion from xdr to cache array */ |
480 | static | |
8cd51a0c | 481 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 482 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 483 | { |
babddc72 | 484 | struct xdr_stream stream; |
f7da7a12 | 485 | struct xdr_buf buf; |
6650239a | 486 | struct page *scratch; |
99424380 | 487 | struct nfs_cache_array *array; |
5c346854 TM |
488 | unsigned int count = 0; |
489 | int status; | |
babddc72 | 490 | |
6650239a TM |
491 | scratch = alloc_page(GFP_KERNEL); |
492 | if (scratch == NULL) | |
493 | return -ENOMEM; | |
babddc72 | 494 | |
f7da7a12 | 495 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 496 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
497 | |
498 | do { | |
499 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
500 | if (status != 0) { |
501 | if (status == -EAGAIN) | |
502 | status = 0; | |
99424380 | 503 | break; |
8cd51a0c | 504 | } |
99424380 | 505 | |
5c346854 TM |
506 | count++; |
507 | ||
47c716cb | 508 | if (desc->plus != 0) |
d39ab9de | 509 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
510 | |
511 | status = nfs_readdir_add_to_array(entry, page); | |
512 | if (status != 0) | |
513 | break; | |
99424380 BS |
514 | } while (!entry->eof); |
515 | ||
47c716cb | 516 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 517 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
518 | if (!IS_ERR(array)) { |
519 | array->eof_index = array->size; | |
520 | status = 0; | |
521 | nfs_readdir_release_array(page); | |
5c346854 TM |
522 | } else |
523 | status = PTR_ERR(array); | |
1da177e4 | 524 | } |
6650239a TM |
525 | |
526 | put_page(scratch); | |
8cd51a0c | 527 | return status; |
56e4ebf8 BS |
528 | } |
529 | ||
530 | static | |
531 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
532 | { | |
533 | unsigned int i; | |
534 | for (i = 0; i < npages; i++) | |
535 | put_page(pages[i]); | |
536 | } | |
537 | ||
538 | static | |
539 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
540 | unsigned int npages) | |
541 | { | |
56e4ebf8 BS |
542 | nfs_readdir_free_pagearray(pages, npages); |
543 | } | |
544 | ||
545 | /* | |
546 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
547 | * to nfs_readdir_free_large_page | |
548 | */ | |
549 | static | |
6650239a | 550 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 551 | { |
56e4ebf8 BS |
552 | unsigned int i; |
553 | ||
554 | for (i = 0; i < npages; i++) { | |
555 | struct page *page = alloc_page(GFP_KERNEL); | |
556 | if (page == NULL) | |
557 | goto out_freepages; | |
558 | pages[i] = page; | |
559 | } | |
6650239a | 560 | return 0; |
56e4ebf8 | 561 | |
56e4ebf8 BS |
562 | out_freepages: |
563 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 564 | return -ENOMEM; |
1da177e4 LT |
565 | } |
566 | ||
d1bacf9e BS |
567 | static |
568 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 569 | { |
56e4ebf8 BS |
570 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
571 | void *pages_ptr = NULL; | |
d1bacf9e BS |
572 | struct nfs_entry entry; |
573 | struct file *file = desc->file; | |
574 | struct nfs_cache_array *array; | |
8cd51a0c | 575 | int status = -ENOMEM; |
56e4ebf8 | 576 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
577 | |
578 | entry.prev_cookie = 0; | |
0aded708 | 579 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
580 | entry.eof = 0; |
581 | entry.fh = nfs_alloc_fhandle(); | |
582 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 583 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
584 | if (entry.fh == NULL || entry.fattr == NULL) |
585 | goto out; | |
00a92642 | 586 | |
d1bacf9e | 587 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
588 | if (IS_ERR(array)) { |
589 | status = PTR_ERR(array); | |
590 | goto out; | |
591 | } | |
d1bacf9e BS |
592 | memset(array, 0, sizeof(struct nfs_cache_array)); |
593 | array->eof_index = -1; | |
00a92642 | 594 | |
6650239a TM |
595 | status = nfs_readdir_large_page(pages, array_size); |
596 | if (status < 0) | |
d1bacf9e BS |
597 | goto out_release_array; |
598 | do { | |
ac396128 | 599 | unsigned int pglen; |
56e4ebf8 | 600 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 601 | |
d1bacf9e | 602 | if (status < 0) |
00a92642 | 603 | break; |
ac396128 | 604 | pglen = status; |
6650239a | 605 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
606 | if (status < 0) { |
607 | if (status == -ENOSPC) | |
608 | status = 0; | |
609 | break; | |
610 | } | |
611 | } while (array->eof_index < 0); | |
d1bacf9e | 612 | |
56e4ebf8 | 613 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
614 | out_release_array: |
615 | nfs_readdir_release_array(page); | |
616 | out: | |
617 | nfs_free_fattr(entry.fattr); | |
618 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
619 | return status; |
620 | } | |
621 | ||
622 | /* | |
d1bacf9e BS |
623 | * Now we cache directories properly, by converting xdr information |
624 | * to an array that can be used for lookups later. This results in | |
625 | * fewer cache pages, since we can store more information on each page. | |
626 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 627 | */ |
d1bacf9e BS |
628 | static |
629 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 630 | { |
01cce933 | 631 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
8cd51a0c | 632 | int ret; |
1da177e4 | 633 | |
8cd51a0c TM |
634 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
635 | if (ret < 0) | |
d1bacf9e BS |
636 | goto error; |
637 | SetPageUptodate(page); | |
1da177e4 | 638 | |
d1bacf9e BS |
639 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
640 | /* Should never happen */ | |
641 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 642 | } |
d1bacf9e BS |
643 | unlock_page(page); |
644 | return 0; | |
645 | error: | |
646 | unlock_page(page); | |
8cd51a0c | 647 | return ret; |
d1bacf9e | 648 | } |
1da177e4 | 649 | |
d1bacf9e BS |
650 | static |
651 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
652 | { | |
11de3b11 TM |
653 | if (!desc->page->mapping) |
654 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
655 | page_cache_release(desc->page); |
656 | desc->page = NULL; | |
657 | } | |
658 | ||
659 | static | |
660 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
661 | { | |
8cd51a0c | 662 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
d1bacf9e | 663 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
664 | } |
665 | ||
666 | /* | |
d1bacf9e | 667 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 668 | */ |
d1bacf9e BS |
669 | static |
670 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
671 | { | |
672 | int res; | |
673 | ||
674 | desc->page = get_cache_page(desc); | |
675 | if (IS_ERR(desc->page)) | |
676 | return PTR_ERR(desc->page); | |
677 | ||
678 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
679 | if (res != 0) |
680 | cache_page_release(desc); | |
d1bacf9e BS |
681 | return res; |
682 | } | |
683 | ||
684 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
685 | static inline |
686 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
687 | { | |
8cd51a0c | 688 | int res; |
d1bacf9e | 689 | |
0aded708 | 690 | if (desc->page_index == 0) { |
8cd51a0c | 691 | desc->current_index = 0; |
0aded708 TM |
692 | desc->last_cookie = 0; |
693 | } | |
47c716cb | 694 | do { |
d1bacf9e | 695 | res = find_cache_page(desc); |
47c716cb | 696 | } while (res == -EAGAIN); |
1da177e4 LT |
697 | return res; |
698 | } | |
699 | ||
1da177e4 LT |
700 | /* |
701 | * Once we've found the start of the dirent within a page: fill 'er up... | |
702 | */ | |
703 | static | |
704 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, | |
705 | filldir_t filldir) | |
706 | { | |
707 | struct file *file = desc->file; | |
d1bacf9e BS |
708 | int i = 0; |
709 | int res = 0; | |
710 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
711 | struct nfs_open_dir_context *ctx = file->private_data; |
712 | ||
d1bacf9e | 713 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
714 | if (IS_ERR(array)) { |
715 | res = PTR_ERR(array); | |
716 | goto out; | |
717 | } | |
d1bacf9e BS |
718 | |
719 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 720 | struct nfs_cache_array_entry *ent; |
1da177e4 | 721 | |
ece0b423 TM |
722 | ent = &array->array[i]; |
723 | if (filldir(dirent, ent->string.name, ent->string.len, | |
0b26a0bf TM |
724 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
725 | ent->d_type) < 0) { | |
ece0b423 | 726 | desc->eof = 1; |
1da177e4 | 727 | break; |
ece0b423 | 728 | } |
00a92642 | 729 | file->f_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 | |
761 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, | |
762 | filldir_t filldir) | |
763 | { | |
1da177e4 LT |
764 | struct page *page = NULL; |
765 | int status; | |
d1bacf9e | 766 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
0c030806 | 767 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 768 | |
1e7cb3dc CL |
769 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
770 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
771 | |
772 | page = alloc_page(GFP_HIGHUSER); | |
773 | if (!page) { | |
774 | status = -ENOMEM; | |
775 | goto out; | |
776 | } | |
d1bacf9e | 777 | |
7a8e1dc3 | 778 | desc->page_index = 0; |
0aded708 | 779 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 780 | desc->page = page; |
0c030806 | 781 | ctx->duped = 0; |
7a8e1dc3 | 782 | |
85f8607e TM |
783 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
784 | if (status < 0) | |
1da177e4 LT |
785 | goto out_release; |
786 | ||
787 | status = nfs_do_filldir(desc, dirent, filldir); | |
788 | ||
1da177e4 | 789 | out: |
1e7cb3dc | 790 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 791 | __func__, status); |
1da177e4 LT |
792 | return status; |
793 | out_release: | |
d1bacf9e | 794 | cache_page_release(desc); |
1da177e4 LT |
795 | goto out; |
796 | } | |
797 | ||
00a92642 OG |
798 | /* The file offset position represents the dirent entry number. A |
799 | last cookie cache takes care of the common case of reading the | |
800 | whole directory. | |
1da177e4 LT |
801 | */ |
802 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
803 | { | |
01cce933 | 804 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
805 | struct inode *inode = dentry->d_inode; |
806 | nfs_readdir_descriptor_t my_desc, | |
807 | *desc = &my_desc; | |
480c2006 | 808 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
47c716cb | 809 | int res; |
1da177e4 | 810 | |
6da24bc9 | 811 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc CL |
812 | dentry->d_parent->d_name.name, dentry->d_name.name, |
813 | (long long)filp->f_pos); | |
91d5b470 CL |
814 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
815 | ||
1da177e4 | 816 | /* |
00a92642 | 817 | * filp->f_pos points to the dirent entry number. |
f0dd2136 | 818 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
819 | * to either find the entry with the appropriate number or |
820 | * revalidate the cookie. | |
1da177e4 LT |
821 | */ |
822 | memset(desc, 0, sizeof(*desc)); | |
823 | ||
824 | desc->file = filp; | |
480c2006 | 825 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 826 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
d69ee9b8 | 827 | desc->plus = nfs_use_readdirplus(inode, filp) ? 1 : 0; |
1da177e4 | 828 | |
565277f6 | 829 | nfs_block_sillyrename(dentry); |
1cda707d | 830 | res = nfs_revalidate_mapping(inode, filp->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 LT |
841 | /* Or that the server has 'lost' a cookie */ |
842 | res = uncached_readdir(desc, dirent, filldir); | |
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 | ||
859 | res = nfs_do_filldir(desc, dirent, filldir); | |
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 | ||
10afec90 | 873 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
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, | |
882 | offset, origin); | |
883 | ||
884 | mutex_lock(&inode->i_mutex); | |
f0dd2136 TM |
885 | switch (origin) { |
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 | */ | |
1da177e4 | 981 | static inline |
fa3c56bb | 982 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
983 | { |
984 | struct nfs_server *server = NFS_SERVER(inode); | |
985 | ||
36d43a43 | 986 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 987 | return 0; |
facc3530 | 988 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 989 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
990 | goto out_force; |
991 | /* This is an open(2) */ | |
fa3c56bb AV |
992 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
993 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 AV |
994 | goto out_force; |
995 | return 0; | |
1da177e4 LT |
996 | out_force: |
997 | return __nfs_revalidate_inode(server, inode); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * We judge how long we want to trust negative | |
1002 | * dentries by looking at the parent inode mtime. | |
1003 | * | |
1004 | * If parent mtime has changed, we revalidate, else we wait for a | |
1005 | * period corresponding to the parent's attribute cache timeout value. | |
1006 | */ | |
1007 | static inline | |
1008 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1009 | unsigned int flags) |
1da177e4 | 1010 | { |
1da177e4 | 1011 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1012 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1013 | return 0; |
4eec952e TM |
1014 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1015 | return 1; | |
1da177e4 LT |
1016 | return !nfs_check_verifier(dir, dentry); |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * This is called every time the dcache has a lookup hit, | |
1021 | * and we should check whether we can really trust that | |
1022 | * lookup. | |
1023 | * | |
1024 | * NOTE! The hit can be a negative hit too, don't assume | |
1025 | * we have an inode! | |
1026 | * | |
1027 | * If the parent directory is seen to have changed, we throw out the | |
1028 | * cached dentry and do a new lookup. | |
1029 | */ | |
0b728e19 | 1030 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1031 | { |
1032 | struct inode *dir; | |
1033 | struct inode *inode; | |
1034 | struct dentry *parent; | |
e1fb4d05 TM |
1035 | struct nfs_fh *fhandle = NULL; |
1036 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1037 | int error; |
1da177e4 | 1038 | |
fa3c56bb | 1039 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1040 | return -ECHILD; |
1041 | ||
1da177e4 | 1042 | parent = dget_parent(dentry); |
1da177e4 | 1043 | dir = parent->d_inode; |
91d5b470 | 1044 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1045 | inode = dentry->d_inode; |
1046 | ||
1047 | if (!inode) { | |
fa3c56bb | 1048 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1049 | goto out_bad; |
d69ee9b8 | 1050 | goto out_valid_noent; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1054 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1055 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1056 | dentry->d_name.name); |
1da177e4 LT |
1057 | goto out_bad; |
1058 | } | |
1059 | ||
011e2a7f | 1060 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1061 | goto out_set_verifier; |
1062 | ||
1da177e4 | 1063 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1064 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1065 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1066 | goto out_zap_parent; |
1067 | goto out_valid; | |
1068 | } | |
1069 | ||
1070 | if (NFS_STALE(inode)) | |
1071 | goto out_bad; | |
1072 | ||
e1fb4d05 TM |
1073 | error = -ENOMEM; |
1074 | fhandle = nfs_alloc_fhandle(); | |
1075 | fattr = nfs_alloc_fattr(); | |
1076 | if (fhandle == NULL || fattr == NULL) | |
1077 | goto out_error; | |
1078 | ||
80a16b21 | 1079 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1080 | if (error) |
1081 | goto out_bad; | |
e1fb4d05 | 1082 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1083 | goto out_bad; |
e1fb4d05 | 1084 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1085 | goto out_bad; |
1086 | ||
e1fb4d05 TM |
1087 | nfs_free_fattr(fattr); |
1088 | nfs_free_fhandle(fhandle); | |
15860ab1 | 1089 | out_set_verifier: |
cf8ba45e | 1090 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1091 | out_valid: |
d69ee9b8 TM |
1092 | /* Success: notify readdir to use READDIRPLUS */ |
1093 | nfs_advise_use_readdirplus(dir); | |
1094 | out_valid_noent: | |
1da177e4 | 1095 | dput(parent); |
1e7cb3dc | 1096 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1097 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1098 | dentry->d_name.name); |
1da177e4 LT |
1099 | return 1; |
1100 | out_zap_parent: | |
1101 | nfs_zap_caches(dir); | |
1102 | out_bad: | |
a1643a92 | 1103 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1104 | if (inode && S_ISDIR(inode->i_mode)) { |
1105 | /* Purge readdir caches. */ | |
1106 | nfs_zap_caches(inode); | |
1107 | /* If we have submounts, don't unhash ! */ | |
1108 | if (have_submounts(dentry)) | |
1109 | goto out_valid; | |
d9e80b7d AV |
1110 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1111 | goto out_valid; | |
1da177e4 LT |
1112 | shrink_dcache_parent(dentry); |
1113 | } | |
1114 | d_drop(dentry); | |
e1fb4d05 TM |
1115 | nfs_free_fattr(fattr); |
1116 | nfs_free_fhandle(fhandle); | |
1da177e4 | 1117 | dput(parent); |
1e7cb3dc | 1118 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1119 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1120 | dentry->d_name.name); |
1da177e4 | 1121 | return 0; |
e1fb4d05 TM |
1122 | out_error: |
1123 | nfs_free_fattr(fattr); | |
1124 | nfs_free_fhandle(fhandle); | |
1125 | dput(parent); | |
1126 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1127 | __func__, dentry->d_parent->d_name.name, | |
1128 | dentry->d_name.name, error); | |
1129 | return error; | |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | /* | |
1133 | * This is called from dput() when d_count is going to 0. | |
1134 | */ | |
fe15ce44 | 1135 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1136 | { |
1137 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1138 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1139 | dentry->d_flags); | |
1140 | ||
77f11192 TM |
1141 | /* Unhash any dentry with a stale inode */ |
1142 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1143 | return 1; | |
1144 | ||
1da177e4 LT |
1145 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1146 | /* Unhash it, so that ->d_iput() would be called */ | |
1147 | return 1; | |
1148 | } | |
1149 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1150 | /* Unhash it, so that ancestors of killed async unlink | |
1151 | * files will be cleaned up during umount */ | |
1152 | return 1; | |
1153 | } | |
1154 | return 0; | |
1155 | ||
1156 | } | |
1157 | ||
1b83d707 TM |
1158 | static void nfs_drop_nlink(struct inode *inode) |
1159 | { | |
1160 | spin_lock(&inode->i_lock); | |
1161 | if (inode->i_nlink > 0) | |
1162 | drop_nlink(inode); | |
1163 | spin_unlock(&inode->i_lock); | |
1164 | } | |
1165 | ||
1da177e4 LT |
1166 | /* |
1167 | * Called when the dentry loses inode. | |
1168 | * We use it to clean up silly-renamed files. | |
1169 | */ | |
1170 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1171 | { | |
83672d39 NB |
1172 | if (S_ISDIR(inode->i_mode)) |
1173 | /* drop any readdir cache as it could easily be old */ | |
1174 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1175 | ||
1da177e4 | 1176 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
9a53c3a7 | 1177 | drop_nlink(inode); |
e4eff1a6 | 1178 | nfs_complete_unlink(dentry, inode); |
1da177e4 | 1179 | } |
1da177e4 LT |
1180 | iput(inode); |
1181 | } | |
1182 | ||
b1942c5f AV |
1183 | static void nfs_d_release(struct dentry *dentry) |
1184 | { | |
1185 | /* free cached devname value, if it survived that far */ | |
1186 | if (unlikely(dentry->d_fsdata)) { | |
1187 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1188 | WARN_ON(1); | |
1189 | else | |
1190 | kfree(dentry->d_fsdata); | |
1191 | } | |
1192 | } | |
1193 | ||
f786aa90 | 1194 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 LT |
1195 | .d_revalidate = nfs_lookup_revalidate, |
1196 | .d_delete = nfs_dentry_delete, | |
1197 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1198 | .d_automount = nfs_d_automount, |
b1942c5f | 1199 | .d_release = nfs_d_release, |
1da177e4 | 1200 | }; |
ddda8e0a | 1201 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1202 | |
597d9289 | 1203 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1204 | { |
1205 | struct dentry *res; | |
565277f6 | 1206 | struct dentry *parent; |
1da177e4 | 1207 | struct inode *inode = NULL; |
e1fb4d05 TM |
1208 | struct nfs_fh *fhandle = NULL; |
1209 | struct nfs_fattr *fattr = NULL; | |
1da177e4 | 1210 | int error; |
1da177e4 LT |
1211 | |
1212 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1213 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1214 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1215 | |
1216 | res = ERR_PTR(-ENAMETOOLONG); | |
1217 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1218 | goto out; | |
1219 | ||
fd684071 TM |
1220 | /* |
1221 | * If we're doing an exclusive create, optimize away the lookup | |
1222 | * but don't hash the dentry. | |
1223 | */ | |
00cd8dd3 | 1224 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1225 | d_instantiate(dentry, NULL); |
1226 | res = NULL; | |
fc0f684c | 1227 | goto out; |
fd684071 | 1228 | } |
1da177e4 | 1229 | |
e1fb4d05 TM |
1230 | res = ERR_PTR(-ENOMEM); |
1231 | fhandle = nfs_alloc_fhandle(); | |
1232 | fattr = nfs_alloc_fattr(); | |
1233 | if (fhandle == NULL || fattr == NULL) | |
1234 | goto out; | |
1235 | ||
565277f6 TM |
1236 | parent = dentry->d_parent; |
1237 | /* Protect against concurrent sillydeletes */ | |
1238 | nfs_block_sillyrename(parent); | |
80a16b21 | 1239 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 LT |
1240 | if (error == -ENOENT) |
1241 | goto no_entry; | |
1242 | if (error < 0) { | |
1243 | res = ERR_PTR(error); | |
565277f6 | 1244 | goto out_unblock_sillyrename; |
1da177e4 | 1245 | } |
e1fb4d05 | 1246 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
bf0c84f1 | 1247 | res = ERR_CAST(inode); |
03f28e3a | 1248 | if (IS_ERR(res)) |
565277f6 | 1249 | goto out_unblock_sillyrename; |
54ceac45 | 1250 | |
d69ee9b8 TM |
1251 | /* Success: notify readdir to use READDIRPLUS */ |
1252 | nfs_advise_use_readdirplus(dir); | |
1253 | ||
1da177e4 | 1254 | no_entry: |
54ceac45 | 1255 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1256 | if (res != NULL) { |
1257 | if (IS_ERR(res)) | |
565277f6 | 1258 | goto out_unblock_sillyrename; |
1da177e4 | 1259 | dentry = res; |
9eaef27b | 1260 | } |
1da177e4 | 1261 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1262 | out_unblock_sillyrename: |
1263 | nfs_unblock_sillyrename(parent); | |
1da177e4 | 1264 | out: |
e1fb4d05 TM |
1265 | nfs_free_fattr(fattr); |
1266 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1267 | return res; |
1268 | } | |
ddda8e0a | 1269 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1270 | |
89d77c8f | 1271 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1272 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1273 | |
f786aa90 | 1274 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1275 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1276 | .d_delete = nfs_dentry_delete, |
1277 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1278 | .d_automount = nfs_d_automount, |
b1942c5f | 1279 | .d_release = nfs_d_release, |
1da177e4 | 1280 | }; |
89d77c8f | 1281 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1282 | |
8a5e929d AV |
1283 | static fmode_t flags_to_mode(int flags) |
1284 | { | |
1285 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1286 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1287 | res |= FMODE_READ; | |
1288 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1289 | res |= FMODE_WRITE; | |
1290 | return res; | |
1291 | } | |
1292 | ||
51141598 | 1293 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1294 | { |
5ede7b1c | 1295 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1296 | } |
1297 | ||
1298 | static int do_open(struct inode *inode, struct file *filp) | |
1299 | { | |
1300 | nfs_fscache_set_inode_cookie(inode, filp); | |
1301 | return 0; | |
1302 | } | |
1303 | ||
d9585277 AV |
1304 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1305 | struct dentry *dentry, | |
30d90494 | 1306 | struct file *file, unsigned open_flags, |
d9585277 | 1307 | int *opened) |
cd9a1c0e | 1308 | { |
0dd2b474 MS |
1309 | int err; |
1310 | ||
1311 | if (ctx->dentry != dentry) { | |
1312 | dput(ctx->dentry); | |
1313 | ctx->dentry = dget(dentry); | |
1314 | } | |
cd9a1c0e TM |
1315 | |
1316 | /* If the open_intent is for execute, we have an extra check to make */ | |
1317 | if (ctx->mode & FMODE_EXEC) { | |
0dd2b474 | 1318 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
d9585277 | 1319 | if (err < 0) |
cd9a1c0e TM |
1320 | goto out; |
1321 | } | |
0dd2b474 | 1322 | |
30d90494 AV |
1323 | err = finish_open(file, dentry, do_open, opened); |
1324 | if (err) | |
d9585277 | 1325 | goto out; |
30d90494 | 1326 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1327 | |
cd9a1c0e TM |
1328 | out: |
1329 | put_nfs_open_context(ctx); | |
d9585277 | 1330 | return err; |
cd9a1c0e TM |
1331 | } |
1332 | ||
73a79706 BS |
1333 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1334 | struct file *file, unsigned open_flags, | |
1335 | umode_t mode, int *opened) | |
1da177e4 | 1336 | { |
cd9a1c0e | 1337 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1338 | struct dentry *res; |
1339 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1340 | struct inode *inode; |
898f635c | 1341 | int err; |
1da177e4 | 1342 | |
0dd2b474 MS |
1343 | /* Expect a negative dentry */ |
1344 | BUG_ON(dentry->d_inode); | |
1345 | ||
1346 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1347 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1348 | ||
0dd2b474 MS |
1349 | /* NFS only supports OPEN on regular files */ |
1350 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1351 | if (!d_unhashed(dentry)) { |
1352 | /* | |
1353 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1354 | * revalidated and is fine, no need to perform lookup | |
1355 | * again | |
1356 | */ | |
d9585277 | 1357 | return -ENOENT; |
0dd2b474 | 1358 | } |
1da177e4 | 1359 | goto no_open; |
02a913a7 | 1360 | } |
1da177e4 | 1361 | |
0dd2b474 | 1362 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1363 | return -ENAMETOOLONG; |
cd9a1c0e | 1364 | |
0dd2b474 | 1365 | if (open_flags & O_CREAT) { |
536e43d1 | 1366 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1367 | attr.ia_mode = mode & ~current_umask(); |
1368 | } | |
536e43d1 TM |
1369 | if (open_flags & O_TRUNC) { |
1370 | attr.ia_valid |= ATTR_SIZE; | |
1371 | attr.ia_size = 0; | |
cd9a1c0e TM |
1372 | } |
1373 | ||
0dd2b474 MS |
1374 | ctx = create_nfs_open_context(dentry, open_flags); |
1375 | err = PTR_ERR(ctx); | |
1376 | if (IS_ERR(ctx)) | |
d9585277 | 1377 | goto out; |
0dd2b474 | 1378 | |
f46e0bd3 | 1379 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1380 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
0dd2b474 | 1381 | d_drop(dentry); |
f46e0bd3 TM |
1382 | if (IS_ERR(inode)) { |
1383 | nfs_unblock_sillyrename(dentry->d_parent); | |
cd9a1c0e | 1384 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1385 | err = PTR_ERR(inode); |
1386 | switch (err) { | |
1387 | case -ENOENT: | |
1388 | d_add(dentry, NULL); | |
1389 | break; | |
1390 | case -EISDIR: | |
1391 | case -ENOTDIR: | |
1392 | goto no_open; | |
1393 | case -ELOOP: | |
1394 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1395 | goto no_open; |
0dd2b474 | 1396 | break; |
1da177e4 | 1397 | /* case -EINVAL: */ |
0dd2b474 MS |
1398 | default: |
1399 | break; | |
1da177e4 | 1400 | } |
d9585277 | 1401 | goto out; |
cd9a1c0e | 1402 | } |
f46e0bd3 | 1403 | res = d_add_unique(dentry, inode); |
0dd2b474 | 1404 | if (res != NULL) |
1da177e4 | 1405 | dentry = res; |
0dd2b474 MS |
1406 | |
1407 | nfs_unblock_sillyrename(dentry->d_parent); | |
f46e0bd3 | 1408 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 | 1409 | |
30d90494 | 1410 | err = nfs_finish_open(ctx, dentry, file, open_flags, opened); |
0dd2b474 MS |
1411 | |
1412 | dput(res); | |
d9585277 AV |
1413 | out: |
1414 | return err; | |
0dd2b474 | 1415 | |
1da177e4 | 1416 | no_open: |
00cd8dd3 | 1417 | res = nfs_lookup(dir, dentry, 0); |
0dd2b474 MS |
1418 | err = PTR_ERR(res); |
1419 | if (IS_ERR(res)) | |
d9585277 | 1420 | goto out; |
0dd2b474 | 1421 | |
e45198a6 | 1422 | return finish_no_open(file, res); |
1da177e4 | 1423 | } |
89d77c8f | 1424 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1425 | |
0b728e19 | 1426 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1427 | { |
1428 | struct dentry *parent = NULL; | |
657e94b6 | 1429 | struct inode *inode; |
1da177e4 | 1430 | struct inode *dir; |
50de348c | 1431 | int ret = 0; |
1da177e4 | 1432 | |
fa3c56bb | 1433 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1434 | return -ECHILD; |
1435 | ||
fa3c56bb | 1436 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1437 | goto no_open; |
1438 | if (d_mountpoint(dentry)) | |
5584c306 | 1439 | goto no_open; |
2b484297 | 1440 | |
eda72afb | 1441 | inode = dentry->d_inode; |
1da177e4 LT |
1442 | parent = dget_parent(dentry); |
1443 | dir = parent->d_inode; | |
2b484297 | 1444 | |
1da177e4 LT |
1445 | /* We can't create new files in nfs_open_revalidate(), so we |
1446 | * optimize away revalidation of negative dentries. | |
1447 | */ | |
216d5d06 | 1448 | if (inode == NULL) { |
fa3c56bb | 1449 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1450 | ret = 1; |
1da177e4 | 1451 | goto out; |
216d5d06 TM |
1452 | } |
1453 | ||
1da177e4 LT |
1454 | /* NFS only supports OPEN on regular files */ |
1455 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1456 | goto no_open_dput; |
1da177e4 | 1457 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1458 | if (flags & LOOKUP_EXCL) |
5584c306 | 1459 | goto no_open_dput; |
1da177e4 | 1460 | |
0ef97dcf MS |
1461 | /* Let f_op->open() actually open (and revalidate) the file */ |
1462 | ret = 1; | |
536e43d1 | 1463 | |
1da177e4 LT |
1464 | out: |
1465 | dput(parent); | |
1da177e4 | 1466 | return ret; |
535918f1 | 1467 | |
5584c306 | 1468 | no_open_dput: |
1da177e4 | 1469 | dput(parent); |
5584c306 | 1470 | no_open: |
0b728e19 | 1471 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1472 | } |
1473 | ||
1da177e4 LT |
1474 | #endif /* CONFIG_NFSV4 */ |
1475 | ||
1da177e4 LT |
1476 | /* |
1477 | * Code common to create, mkdir, and mknod. | |
1478 | */ | |
1479 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1480 | struct nfs_fattr *fattr) | |
1481 | { | |
fab728e1 TM |
1482 | struct dentry *parent = dget_parent(dentry); |
1483 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1484 | struct inode *inode; |
1485 | int error = -EACCES; | |
1486 | ||
fab728e1 TM |
1487 | d_drop(dentry); |
1488 | ||
1da177e4 LT |
1489 | /* We may have been initialized further down */ |
1490 | if (dentry->d_inode) | |
fab728e1 | 1491 | goto out; |
1da177e4 | 1492 | if (fhandle->size == 0) { |
80a16b21 | 1493 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
1da177e4 | 1494 | if (error) |
fab728e1 | 1495 | goto out_error; |
1da177e4 | 1496 | } |
5724ab37 | 1497 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1498 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1499 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
8fa5c000 | 1500 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
1da177e4 | 1501 | if (error < 0) |
fab728e1 | 1502 | goto out_error; |
1da177e4 | 1503 | } |
1da177e4 | 1504 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
03f28e3a TM |
1505 | error = PTR_ERR(inode); |
1506 | if (IS_ERR(inode)) | |
fab728e1 TM |
1507 | goto out_error; |
1508 | d_add(dentry, inode); | |
1509 | out: | |
1510 | dput(parent); | |
1da177e4 | 1511 | return 0; |
fab728e1 TM |
1512 | out_error: |
1513 | nfs_mark_for_revalidate(dir); | |
1514 | dput(parent); | |
1515 | return error; | |
1da177e4 | 1516 | } |
ddda8e0a | 1517 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1518 | |
1519 | /* | |
1520 | * Following a failed create operation, we drop the dentry rather | |
1521 | * than retain a negative dentry. This avoids a problem in the event | |
1522 | * that the operation succeeded on the server, but an error in the | |
1523 | * reply path made it appear to have failed. | |
1524 | */ | |
597d9289 | 1525 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1526 | umode_t mode, bool excl) |
1da177e4 LT |
1527 | { |
1528 | struct iattr attr; | |
ebfc3b49 | 1529 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1530 | int error; |
1da177e4 | 1531 | |
1e7cb3dc CL |
1532 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1533 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1534 | |
1535 | attr.ia_mode = mode; | |
1536 | attr.ia_valid = ATTR_MODE; | |
1537 | ||
8867fe58 | 1538 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1539 | if (error != 0) |
1540 | goto out_err; | |
1da177e4 LT |
1541 | return 0; |
1542 | out_err: | |
1da177e4 LT |
1543 | d_drop(dentry); |
1544 | return error; | |
1545 | } | |
ddda8e0a | 1546 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1547 | |
1548 | /* | |
1549 | * See comments for nfs_proc_create regarding failed operations. | |
1550 | */ | |
597d9289 | 1551 | int |
1a67aafb | 1552 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1553 | { |
1554 | struct iattr attr; | |
1555 | int status; | |
1556 | ||
1e7cb3dc CL |
1557 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1558 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1559 | |
1560 | if (!new_valid_dev(rdev)) | |
1561 | return -EINVAL; | |
1562 | ||
1563 | attr.ia_mode = mode; | |
1564 | attr.ia_valid = ATTR_MODE; | |
1565 | ||
1da177e4 | 1566 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1567 | if (status != 0) |
1568 | goto out_err; | |
1da177e4 LT |
1569 | return 0; |
1570 | out_err: | |
1da177e4 LT |
1571 | d_drop(dentry); |
1572 | return status; | |
1573 | } | |
ddda8e0a | 1574 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1575 | |
1576 | /* | |
1577 | * See comments for nfs_proc_create regarding failed operations. | |
1578 | */ | |
597d9289 | 1579 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1580 | { |
1581 | struct iattr attr; | |
1582 | int error; | |
1583 | ||
1e7cb3dc CL |
1584 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1585 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1586 | |
1587 | attr.ia_valid = ATTR_MODE; | |
1588 | attr.ia_mode = mode | S_IFDIR; | |
1589 | ||
1da177e4 | 1590 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1591 | if (error != 0) |
1592 | goto out_err; | |
1da177e4 LT |
1593 | return 0; |
1594 | out_err: | |
1595 | d_drop(dentry); | |
1da177e4 LT |
1596 | return error; |
1597 | } | |
ddda8e0a | 1598 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1599 | |
d45b9d8b TM |
1600 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1601 | { | |
1602 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1603 | d_delete(dentry); | |
1604 | } | |
1605 | ||
597d9289 | 1606 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1607 | { |
1608 | int error; | |
1609 | ||
1e7cb3dc CL |
1610 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1611 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1612 | |
1da177e4 LT |
1613 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1614 | /* Ensure the VFS deletes this inode */ | |
1615 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1616 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1617 | else if (error == -ENOENT) |
1618 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1619 | |
1620 | return error; | |
1621 | } | |
ddda8e0a | 1622 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1623 | |
1da177e4 LT |
1624 | /* |
1625 | * Remove a file after making sure there are no pending writes, | |
1626 | * and after checking that the file has only one user. | |
1627 | * | |
1628 | * We invalidate the attribute cache and free the inode prior to the operation | |
1629 | * to avoid possible races if the server reuses the inode. | |
1630 | */ | |
1631 | static int nfs_safe_remove(struct dentry *dentry) | |
1632 | { | |
1633 | struct inode *dir = dentry->d_parent->d_inode; | |
1634 | struct inode *inode = dentry->d_inode; | |
1635 | int error = -EBUSY; | |
1636 | ||
1637 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1638 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1639 | ||
1640 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1641 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1642 | error = 0; | |
1643 | goto out; | |
1644 | } | |
1645 | ||
1da177e4 | 1646 | if (inode != NULL) { |
57ec14c5 | 1647 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 LT |
1648 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1649 | /* The VFS may want to delete this inode */ | |
1650 | if (error == 0) | |
1b83d707 | 1651 | nfs_drop_nlink(inode); |
5ba7cc48 | 1652 | nfs_mark_for_revalidate(inode); |
1da177e4 LT |
1653 | } else |
1654 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1655 | if (error == -ENOENT) |
1656 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1657 | out: |
1658 | return error; | |
1659 | } | |
1660 | ||
1661 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1662 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1663 | * | |
1664 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1665 | */ | |
597d9289 | 1666 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1667 | { |
1668 | int error; | |
1669 | int need_rehash = 0; | |
1670 | ||
1671 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1672 | dir->i_ino, dentry->d_name.name); | |
1673 | ||
1da177e4 | 1674 | spin_lock(&dentry->d_lock); |
b7ab39f6 | 1675 | if (dentry->d_count > 1) { |
1da177e4 | 1676 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1677 | /* Start asynchronous writeout of the inode */ |
1678 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1679 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1680 | return error; |
1681 | } | |
1682 | if (!d_unhashed(dentry)) { | |
1683 | __d_drop(dentry); | |
1684 | need_rehash = 1; | |
1685 | } | |
1686 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1687 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1688 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1689 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1690 | } else if (need_rehash) | |
1691 | d_rehash(dentry); | |
1da177e4 LT |
1692 | return error; |
1693 | } | |
ddda8e0a | 1694 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1695 | |
873101b3 CL |
1696 | /* |
1697 | * To create a symbolic link, most file systems instantiate a new inode, | |
1698 | * add a page to it containing the path, then write it out to the disk | |
1699 | * using prepare_write/commit_write. | |
1700 | * | |
1701 | * Unfortunately the NFS client can't create the in-core inode first | |
1702 | * because it needs a file handle to create an in-core inode (see | |
1703 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1704 | * symlink request has completed on the server. | |
1705 | * | |
1706 | * So instead we allocate a raw page, copy the symname into it, then do | |
1707 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1708 | * now have a new file handle and can instantiate an in-core NFS inode | |
1709 | * and move the raw page into its mapping. | |
1710 | */ | |
597d9289 | 1711 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1712 | { |
873101b3 CL |
1713 | struct pagevec lru_pvec; |
1714 | struct page *page; | |
1715 | char *kaddr; | |
1da177e4 | 1716 | struct iattr attr; |
873101b3 | 1717 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1718 | int error; |
1719 | ||
1720 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1721 | dir->i_ino, dentry->d_name.name, symname); | |
1722 | ||
873101b3 CL |
1723 | if (pathlen > PAGE_SIZE) |
1724 | return -ENAMETOOLONG; | |
1da177e4 | 1725 | |
873101b3 CL |
1726 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1727 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1728 | |
83d93f22 | 1729 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1730 | if (!page) |
873101b3 | 1731 | return -ENOMEM; |
873101b3 | 1732 | |
2b86ce2d | 1733 | kaddr = kmap_atomic(page); |
873101b3 CL |
1734 | memcpy(kaddr, symname, pathlen); |
1735 | if (pathlen < PAGE_SIZE) | |
1736 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1737 | kunmap_atomic(kaddr); |
873101b3 | 1738 | |
94a6d753 | 1739 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1740 | if (error != 0) { |
1741 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1742 | dir->i_sb->s_id, dir->i_ino, | |
1743 | dentry->d_name.name, symname, error); | |
1da177e4 | 1744 | d_drop(dentry); |
873101b3 | 1745 | __free_page(page); |
873101b3 CL |
1746 | return error; |
1747 | } | |
1748 | ||
1749 | /* | |
1750 | * No big deal if we can't add this page to the page cache here. | |
1751 | * READLINK will get the missing page from the server if needed. | |
1752 | */ | |
1753 | pagevec_init(&lru_pvec, 0); | |
1754 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, | |
1755 | GFP_KERNEL)) { | |
39cf8a13 | 1756 | pagevec_add(&lru_pvec, page); |
4f98a2fe | 1757 | pagevec_lru_add_file(&lru_pvec); |
873101b3 CL |
1758 | SetPageUptodate(page); |
1759 | unlock_page(page); | |
1760 | } else | |
1761 | __free_page(page); | |
1762 | ||
873101b3 | 1763 | return 0; |
1da177e4 | 1764 | } |
ddda8e0a | 1765 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1766 | |
597d9289 | 1767 | int |
1da177e4 LT |
1768 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1769 | { | |
1770 | struct inode *inode = old_dentry->d_inode; | |
1771 | int error; | |
1772 | ||
1773 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1774 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1775 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1776 | ||
57ec14c5 | 1777 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1778 | |
9697d234 | 1779 | d_drop(dentry); |
1da177e4 | 1780 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1781 | if (error == 0) { |
7de9c6ee | 1782 | ihold(inode); |
9697d234 | 1783 | d_add(dentry, inode); |
cf809556 | 1784 | } |
1da177e4 LT |
1785 | return error; |
1786 | } | |
ddda8e0a | 1787 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1788 | |
1789 | /* | |
1790 | * RENAME | |
1791 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1792 | * different file handle for the same inode after a rename (e.g. when | |
1793 | * moving to a different directory). A fail-safe method to do so would | |
1794 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1795 | * rename the old file using the sillyrename stuff. This way, the original | |
1796 | * file in old_dir will go away when the last process iput()s the inode. | |
1797 | * | |
1798 | * FIXED. | |
1799 | * | |
1800 | * It actually works quite well. One needs to have the possibility for | |
1801 | * at least one ".nfs..." file in each directory the file ever gets | |
1802 | * moved or linked to which happens automagically with the new | |
1803 | * implementation that only depends on the dcache stuff instead of | |
1804 | * using the inode layer | |
1805 | * | |
1806 | * Unfortunately, things are a little more complicated than indicated | |
1807 | * above. For a cross-directory move, we want to make sure we can get | |
1808 | * rid of the old inode after the operation. This means there must be | |
1809 | * no pending writes (if it's a file), and the use count must be 1. | |
1810 | * If these conditions are met, we can drop the dentries before doing | |
1811 | * the rename. | |
1812 | */ | |
597d9289 | 1813 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1814 | struct inode *new_dir, struct dentry *new_dentry) |
1815 | { | |
1816 | struct inode *old_inode = old_dentry->d_inode; | |
1817 | struct inode *new_inode = new_dentry->d_inode; | |
1818 | struct dentry *dentry = NULL, *rehash = NULL; | |
1819 | int error = -EBUSY; | |
1820 | ||
1da177e4 LT |
1821 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1822 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1823 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
b7ab39f6 | 1824 | new_dentry->d_count); |
1da177e4 LT |
1825 | |
1826 | /* | |
28f79a1a MS |
1827 | * For non-directories, check whether the target is busy and if so, |
1828 | * make a copy of the dentry and then do a silly-rename. If the | |
1829 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1830 | * the new target. | |
1da177e4 | 1831 | */ |
27226104 MS |
1832 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1833 | /* | |
1834 | * To prevent any new references to the target during the | |
1835 | * rename, we unhash the dentry in advance. | |
1836 | */ | |
1837 | if (!d_unhashed(new_dentry)) { | |
1838 | d_drop(new_dentry); | |
1839 | rehash = new_dentry; | |
1840 | } | |
1da177e4 | 1841 | |
b7ab39f6 | 1842 | if (new_dentry->d_count > 2) { |
27226104 MS |
1843 | int err; |
1844 | ||
1845 | /* copy the target dentry's name */ | |
1846 | dentry = d_alloc(new_dentry->d_parent, | |
1847 | &new_dentry->d_name); | |
1848 | if (!dentry) | |
1849 | goto out; | |
1850 | ||
1851 | /* silly-rename the existing target ... */ | |
1852 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1853 | if (err) |
27226104 | 1854 | goto out; |
24e93025 MS |
1855 | |
1856 | new_dentry = dentry; | |
56335936 | 1857 | rehash = NULL; |
24e93025 | 1858 | new_inode = NULL; |
27226104 | 1859 | } |
b1e4adf4 | 1860 | } |
1da177e4 | 1861 | |
57ec14c5 | 1862 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1863 | if (new_inode != NULL) |
57ec14c5 | 1864 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1865 | |
1da177e4 LT |
1866 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1867 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1868 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1869 | out: |
1870 | if (rehash) | |
1871 | d_rehash(rehash); | |
1872 | if (!error) { | |
b1e4adf4 TM |
1873 | if (new_inode != NULL) |
1874 | nfs_drop_nlink(new_inode); | |
349457cc | 1875 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1876 | nfs_set_verifier(new_dentry, |
1877 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1878 | } else if (error == -ENOENT) |
1879 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1880 | |
1881 | /* new dentry created? */ | |
1882 | if (dentry) | |
1883 | dput(dentry); | |
1da177e4 LT |
1884 | return error; |
1885 | } | |
ddda8e0a | 1886 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 1887 | |
cfcea3e8 TM |
1888 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1889 | static LIST_HEAD(nfs_access_lru_list); | |
1890 | static atomic_long_t nfs_access_nr_entries; | |
1891 | ||
1c3c07e9 TM |
1892 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1893 | { | |
1894 | put_rpccred(entry->cred); | |
1895 | kfree(entry); | |
cfcea3e8 TM |
1896 | smp_mb__before_atomic_dec(); |
1897 | atomic_long_dec(&nfs_access_nr_entries); | |
1898 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1899 | } |
1900 | ||
1a81bb8a TM |
1901 | static void nfs_access_free_list(struct list_head *head) |
1902 | { | |
1903 | struct nfs_access_entry *cache; | |
1904 | ||
1905 | while (!list_empty(head)) { | |
1906 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1907 | list_del(&cache->lru); | |
1908 | nfs_access_free_entry(cache); | |
1909 | } | |
1910 | } | |
1911 | ||
1495f230 YH |
1912 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
1913 | struct shrink_control *sc) | |
979df72e TM |
1914 | { |
1915 | LIST_HEAD(head); | |
aa510da5 | 1916 | struct nfs_inode *nfsi, *next; |
979df72e | 1917 | struct nfs_access_entry *cache; |
1495f230 YH |
1918 | int nr_to_scan = sc->nr_to_scan; |
1919 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 1920 | |
61d5eb29 TM |
1921 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1922 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1923 | |
a50f7951 | 1924 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1925 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1926 | struct inode *inode; |
1927 | ||
1928 | if (nr_to_scan-- == 0) | |
1929 | break; | |
9c7e7e23 | 1930 | inode = &nfsi->vfs_inode; |
979df72e TM |
1931 | spin_lock(&inode->i_lock); |
1932 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1933 | goto remove_lru_entry; | |
1934 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1935 | struct nfs_access_entry, lru); | |
1936 | list_move(&cache->lru, &head); | |
1937 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1938 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1939 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1940 | &nfs_access_lru_list); | |
1941 | else { | |
1942 | remove_lru_entry: | |
1943 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 1944 | smp_mb__before_clear_bit(); |
979df72e | 1945 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 1946 | smp_mb__after_clear_bit(); |
979df72e | 1947 | } |
59844a9b | 1948 | spin_unlock(&inode->i_lock); |
979df72e TM |
1949 | } |
1950 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 1951 | nfs_access_free_list(&head); |
979df72e TM |
1952 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
1953 | } | |
1954 | ||
1a81bb8a | 1955 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 1956 | { |
1c3c07e9 | 1957 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 1958 | struct rb_node *n; |
1c3c07e9 TM |
1959 | struct nfs_access_entry *entry; |
1960 | ||
1961 | /* Unhook entries from the cache */ | |
1962 | while ((n = rb_first(root_node)) != NULL) { | |
1963 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1964 | rb_erase(n, root_node); | |
1a81bb8a | 1965 | list_move(&entry->lru, head); |
1c3c07e9 TM |
1966 | } |
1967 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
1968 | } |
1969 | ||
1c3c07e9 | 1970 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 1971 | { |
1a81bb8a TM |
1972 | LIST_HEAD(head); |
1973 | ||
1974 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
1975 | return; | |
cfcea3e8 | 1976 | /* Remove from global LRU init */ |
1a81bb8a TM |
1977 | spin_lock(&nfs_access_lru_lock); |
1978 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 1979 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 1980 | |
1c3c07e9 | 1981 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
1982 | __nfs_access_zap_cache(NFS_I(inode), &head); |
1983 | spin_unlock(&inode->i_lock); | |
1984 | spin_unlock(&nfs_access_lru_lock); | |
1985 | nfs_access_free_list(&head); | |
1c3c07e9 | 1986 | } |
1c606fb7 | 1987 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 1988 | |
1c3c07e9 TM |
1989 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
1990 | { | |
1991 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1992 | struct nfs_access_entry *entry; | |
1993 | ||
1994 | while (n != NULL) { | |
1995 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
1996 | ||
1997 | if (cred < entry->cred) | |
1998 | n = n->rb_left; | |
1999 | else if (cred > entry->cred) | |
2000 | n = n->rb_right; | |
2001 | else | |
2002 | return entry; | |
1da177e4 | 2003 | } |
1c3c07e9 TM |
2004 | return NULL; |
2005 | } | |
2006 | ||
af22f94a | 2007 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2008 | { |
2009 | struct nfs_inode *nfsi = NFS_I(inode); | |
2010 | struct nfs_access_entry *cache; | |
2011 | int err = -ENOENT; | |
2012 | ||
dc59250c | 2013 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2014 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2015 | goto out_zap; | |
2016 | cache = nfs_access_search_rbtree(inode, cred); | |
2017 | if (cache == NULL) | |
2018 | goto out; | |
b4d2314b | 2019 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2020 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2021 | goto out_stale; |
2022 | res->jiffies = cache->jiffies; | |
2023 | res->cred = cache->cred; | |
2024 | res->mask = cache->mask; | |
cfcea3e8 | 2025 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2026 | err = 0; |
2027 | out: | |
2028 | spin_unlock(&inode->i_lock); | |
2029 | return err; | |
2030 | out_stale: | |
2031 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2032 | list_del(&cache->lru); |
1c3c07e9 TM |
2033 | spin_unlock(&inode->i_lock); |
2034 | nfs_access_free_entry(cache); | |
2035 | return -ENOENT; | |
2036 | out_zap: | |
1a81bb8a TM |
2037 | spin_unlock(&inode->i_lock); |
2038 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2039 | return -ENOENT; |
2040 | } | |
2041 | ||
2042 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2043 | { | |
cfcea3e8 TM |
2044 | struct nfs_inode *nfsi = NFS_I(inode); |
2045 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2046 | struct rb_node **p = &root_node->rb_node; |
2047 | struct rb_node *parent = NULL; | |
2048 | struct nfs_access_entry *entry; | |
2049 | ||
2050 | spin_lock(&inode->i_lock); | |
2051 | while (*p != NULL) { | |
2052 | parent = *p; | |
2053 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2054 | ||
2055 | if (set->cred < entry->cred) | |
2056 | p = &parent->rb_left; | |
2057 | else if (set->cred > entry->cred) | |
2058 | p = &parent->rb_right; | |
2059 | else | |
2060 | goto found; | |
2061 | } | |
2062 | rb_link_node(&set->rb_node, parent, p); | |
2063 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2064 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2065 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2066 | return; |
2067 | found: | |
2068 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2069 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2070 | list_del(&entry->lru); | |
1c3c07e9 TM |
2071 | spin_unlock(&inode->i_lock); |
2072 | nfs_access_free_entry(entry); | |
2073 | } | |
2074 | ||
6168f62c | 2075 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2076 | { |
2077 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2078 | if (cache == NULL) | |
2079 | return; | |
2080 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2081 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2082 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2083 | cache->mask = set->mask; |
1c3c07e9 TM |
2084 | |
2085 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2086 | |
2087 | /* Update accounting */ | |
2088 | smp_mb__before_atomic_inc(); | |
2089 | atomic_long_inc(&nfs_access_nr_entries); | |
2090 | smp_mb__after_atomic_inc(); | |
2091 | ||
2092 | /* Add inode to global LRU list */ | |
1a81bb8a | 2093 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2094 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2095 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2096 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2097 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2098 | spin_unlock(&nfs_access_lru_lock); |
2099 | } | |
1da177e4 | 2100 | } |
6168f62c WAA |
2101 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2102 | ||
2103 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2104 | { | |
2105 | entry->mask = 0; | |
2106 | if (access_result & NFS4_ACCESS_READ) | |
2107 | entry->mask |= MAY_READ; | |
2108 | if (access_result & | |
2109 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2110 | entry->mask |= MAY_WRITE; | |
2111 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2112 | entry->mask |= MAY_EXEC; | |
2113 | } | |
2114 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2115 | |
2116 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2117 | { | |
2118 | struct nfs_access_entry cache; | |
2119 | int status; | |
2120 | ||
2121 | status = nfs_access_get_cached(inode, cred, &cache); | |
2122 | if (status == 0) | |
2123 | goto out; | |
2124 | ||
2125 | /* Be clever: ask server to check for all possible rights */ | |
2126 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2127 | cache.cred = cred; | |
2128 | cache.jiffies = jiffies; | |
2129 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2130 | if (status != 0) { |
2131 | if (status == -ESTALE) { | |
2132 | nfs_zap_caches(inode); | |
2133 | if (!S_ISDIR(inode->i_mode)) | |
2134 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2135 | } | |
1da177e4 | 2136 | return status; |
a71ee337 | 2137 | } |
1da177e4 LT |
2138 | nfs_access_add_cache(inode, &cache); |
2139 | out: | |
e6305c43 | 2140 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2141 | return 0; |
2142 | return -EACCES; | |
2143 | } | |
2144 | ||
af22f94a TM |
2145 | static int nfs_open_permission_mask(int openflags) |
2146 | { | |
2147 | int mask = 0; | |
2148 | ||
8a5e929d | 2149 | if ((openflags & O_ACCMODE) != O_WRONLY) |
af22f94a | 2150 | mask |= MAY_READ; |
8a5e929d | 2151 | if ((openflags & O_ACCMODE) != O_RDONLY) |
af22f94a | 2152 | mask |= MAY_WRITE; |
8a5e929d | 2153 | if (openflags & __FMODE_EXEC) |
af22f94a TM |
2154 | mask |= MAY_EXEC; |
2155 | return mask; | |
2156 | } | |
2157 | ||
2158 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2159 | { | |
2160 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2161 | } | |
89d77c8f | 2162 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2163 | |
10556cb2 | 2164 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2165 | { |
2166 | struct rpc_cred *cred; | |
2167 | int res = 0; | |
2168 | ||
10556cb2 | 2169 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2170 | return -ECHILD; |
2171 | ||
91d5b470 CL |
2172 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2173 | ||
e6305c43 | 2174 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2175 | goto out; |
2176 | /* Is this sys_access() ? */ | |
9cfcac81 | 2177 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2178 | goto force_lookup; |
2179 | ||
2180 | switch (inode->i_mode & S_IFMT) { | |
2181 | case S_IFLNK: | |
2182 | goto out; | |
2183 | case S_IFREG: | |
2184 | /* NFSv4 has atomic_open... */ | |
2185 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2186 | && (mask & MAY_OPEN) |
2187 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2188 | goto out; |
2189 | break; | |
2190 | case S_IFDIR: | |
2191 | /* | |
2192 | * Optimize away all write operations, since the server | |
2193 | * will check permissions when we perform the op. | |
2194 | */ | |
2195 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2196 | goto out; | |
2197 | } | |
2198 | ||
2199 | force_lookup: | |
1da177e4 LT |
2200 | if (!NFS_PROTO(inode)->access) |
2201 | goto out_notsup; | |
2202 | ||
98a8e323 | 2203 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2204 | if (!IS_ERR(cred)) { |
2205 | res = nfs_do_access(inode, cred, mask); | |
2206 | put_rpccred(cred); | |
2207 | } else | |
2208 | res = PTR_ERR(cred); | |
1da177e4 | 2209 | out: |
f696a365 MS |
2210 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2211 | res = -EACCES; | |
2212 | ||
1e7cb3dc CL |
2213 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2214 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2215 | return res; |
2216 | out_notsup: | |
2217 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2218 | if (res == 0) | |
2830ba7f | 2219 | res = generic_permission(inode, mask); |
1e7cb3dc | 2220 | goto out; |
1da177e4 | 2221 | } |
ddda8e0a | 2222 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2223 | |
2224 | /* | |
2225 | * Local variables: | |
2226 | * version-control: t | |
2227 | * kept-new-versions: 5 | |
2228 | * End: | |
2229 | */ |