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> |
a0b8cab3 | 36 | #include <linux/swap.h> |
e8edc6e0 | 37 | #include <linux/sched.h> |
04e4bd1c | 38 | #include <linux/kmemleak.h> |
64c2ce8b | 39 | #include <linux/xattr.h> |
1da177e4 LT |
40 | |
41 | #include "delegation.h" | |
91d5b470 | 42 | #include "iostat.h" |
4c30d56e | 43 | #include "internal.h" |
cd9a1c0e | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | /* #define NFS_DEBUG_VERBOSE 1 */ |
47 | ||
48 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 49 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 50 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 51 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 52 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 53 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 54 | |
4b6f5d20 | 55 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 56 | .llseek = nfs_llseek_dir, |
1da177e4 | 57 | .read = generic_read_dir, |
23db8620 | 58 | .iterate = nfs_readdir, |
1da177e4 | 59 | .open = nfs_opendir, |
480c2006 | 60 | .release = nfs_closedir, |
1da177e4 LT |
61 | .fsync = nfs_fsync_dir, |
62 | }; | |
63 | ||
11de3b11 TM |
64 | const struct address_space_operations nfs_dir_aops = { |
65 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
66 | }; |
67 | ||
0c030806 | 68 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
69 | { |
70 | struct nfs_open_dir_context *ctx; | |
71 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
72 | if (ctx != NULL) { | |
8ef2ce3e | 73 | ctx->duped = 0; |
0c030806 | 74 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 75 | ctx->dir_cookie = 0; |
8ef2ce3e | 76 | ctx->dup_cookie = 0; |
480c2006 | 77 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
78 | return ctx; |
79 | } | |
80 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
81 | } |
82 | ||
83 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
84 | { | |
85 | put_rpccred(ctx->cred); | |
86 | kfree(ctx); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * Open file | |
91 | */ | |
92 | static int | |
93 | nfs_opendir(struct inode *inode, struct file *filp) | |
94 | { | |
480c2006 BS |
95 | int res = 0; |
96 | struct nfs_open_dir_context *ctx; | |
97 | struct rpc_cred *cred; | |
1da177e4 | 98 | |
6da24bc9 | 99 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
cc0dd2d1 CL |
100 | filp->f_path.dentry->d_parent->d_name.name, |
101 | filp->f_path.dentry->d_name.name); | |
102 | ||
103 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 104 | |
480c2006 BS |
105 | cred = rpc_lookup_cred(); |
106 | if (IS_ERR(cred)) | |
107 | return PTR_ERR(cred); | |
0c030806 | 108 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
109 | if (IS_ERR(ctx)) { |
110 | res = PTR_ERR(ctx); | |
111 | goto out; | |
112 | } | |
113 | filp->private_data = ctx; | |
f5a73672 NB |
114 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
115 | /* This is a mountpoint, so d_revalidate will never | |
116 | * have been called, so we need to refresh the | |
117 | * inode (for close-open consistency) ourselves. | |
118 | */ | |
119 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
120 | } | |
480c2006 BS |
121 | out: |
122 | put_rpccred(cred); | |
1da177e4 LT |
123 | return res; |
124 | } | |
125 | ||
480c2006 BS |
126 | static int |
127 | nfs_closedir(struct inode *inode, struct file *filp) | |
128 | { | |
129 | put_nfs_open_dir_context(filp->private_data); | |
130 | return 0; | |
131 | } | |
132 | ||
d1bacf9e BS |
133 | struct nfs_cache_array_entry { |
134 | u64 cookie; | |
135 | u64 ino; | |
136 | struct qstr string; | |
0b26a0bf | 137 | unsigned char d_type; |
d1bacf9e BS |
138 | }; |
139 | ||
140 | struct nfs_cache_array { | |
88b8e133 | 141 | int size; |
d1bacf9e BS |
142 | int eof_index; |
143 | u64 last_cookie; | |
144 | struct nfs_cache_array_entry array[0]; | |
145 | }; | |
146 | ||
573c4e1e | 147 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
148 | typedef struct { |
149 | struct file *file; | |
150 | struct page *page; | |
23db8620 | 151 | struct dir_context *ctx; |
1da177e4 | 152 | unsigned long page_index; |
f0dd2136 | 153 | u64 *dir_cookie; |
0aded708 | 154 | u64 last_cookie; |
f0dd2136 | 155 | loff_t current_index; |
1da177e4 | 156 | decode_dirent_t decode; |
d1bacf9e | 157 | |
1f4eab7e | 158 | unsigned long timestamp; |
4704f0e2 | 159 | unsigned long gencount; |
d1bacf9e BS |
160 | unsigned int cache_entry_index; |
161 | unsigned int plus:1; | |
162 | unsigned int eof:1; | |
1da177e4 LT |
163 | } nfs_readdir_descriptor_t; |
164 | ||
d1bacf9e BS |
165 | /* |
166 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
167 | */ |
168 | static | |
d1bacf9e BS |
169 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
170 | { | |
8cd51a0c | 171 | void *ptr; |
d1bacf9e BS |
172 | if (page == NULL) |
173 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
174 | ptr = kmap(page); |
175 | if (ptr == NULL) | |
176 | return ERR_PTR(-ENOMEM); | |
177 | return ptr; | |
d1bacf9e BS |
178 | } |
179 | ||
180 | static | |
181 | void nfs_readdir_release_array(struct page *page) | |
182 | { | |
183 | kunmap(page); | |
184 | } | |
185 | ||
186 | /* | |
187 | * we are freeing strings created by nfs_add_to_readdir_array() | |
188 | */ | |
189 | static | |
11de3b11 | 190 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 191 | { |
11de3b11 | 192 | struct nfs_cache_array *array; |
d1bacf9e | 193 | int i; |
8cd51a0c | 194 | |
2b86ce2d | 195 | array = kmap_atomic(page); |
d1bacf9e BS |
196 | for (i = 0; i < array->size; i++) |
197 | kfree(array->array[i].string.name); | |
2b86ce2d | 198 | kunmap_atomic(array); |
d1bacf9e BS |
199 | } |
200 | ||
201 | /* | |
202 | * the caller is responsible for freeing qstr.name | |
203 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
204 | * nfs_clear_readdir_array() | |
205 | */ | |
206 | static | |
4a201d6e | 207 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
208 | { |
209 | string->len = len; | |
210 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
211 | if (string->name == NULL) |
212 | return -ENOMEM; | |
04e4bd1c CM |
213 | /* |
214 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
215 | * in a page cache page which kmemleak does not scan. | |
216 | */ | |
217 | kmemleak_not_leak(string->name); | |
4a201d6e TM |
218 | string->hash = full_name_hash(name, len); |
219 | return 0; | |
d1bacf9e BS |
220 | } |
221 | ||
222 | static | |
223 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
224 | { | |
225 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
226 | struct nfs_cache_array_entry *cache_entry; |
227 | int ret; | |
228 | ||
d1bacf9e BS |
229 | if (IS_ERR(array)) |
230 | return PTR_ERR(array); | |
3020093f TM |
231 | |
232 | cache_entry = &array->array[array->size]; | |
233 | ||
234 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 235 | ret = -ENOSPC; |
3020093f | 236 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 237 | goto out; |
d1bacf9e | 238 | |
4a201d6e TM |
239 | cache_entry->cookie = entry->prev_cookie; |
240 | cache_entry->ino = entry->ino; | |
0b26a0bf | 241 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
242 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
243 | if (ret) | |
244 | goto out; | |
d1bacf9e | 245 | array->last_cookie = entry->cookie; |
8cd51a0c | 246 | array->size++; |
47c716cb | 247 | if (entry->eof != 0) |
d1bacf9e | 248 | array->eof_index = array->size; |
4a201d6e | 249 | out: |
d1bacf9e | 250 | nfs_readdir_release_array(page); |
4a201d6e | 251 | return ret; |
d1bacf9e BS |
252 | } |
253 | ||
254 | static | |
255 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
256 | { | |
23db8620 | 257 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
258 | unsigned int index; |
259 | ||
260 | if (diff < 0) | |
261 | goto out_eof; | |
262 | if (diff >= array->size) { | |
8cd51a0c | 263 | if (array->eof_index >= 0) |
d1bacf9e | 264 | goto out_eof; |
d1bacf9e BS |
265 | return -EAGAIN; |
266 | } | |
267 | ||
268 | index = (unsigned int)diff; | |
269 | *desc->dir_cookie = array->array[index].cookie; | |
270 | desc->cache_entry_index = index; | |
d1bacf9e BS |
271 | return 0; |
272 | out_eof: | |
273 | desc->eof = 1; | |
274 | return -EBADCOOKIE; | |
275 | } | |
276 | ||
277 | static | |
278 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
279 | { | |
280 | int i; | |
8ef2ce3e | 281 | loff_t new_pos; |
d1bacf9e BS |
282 | int status = -EAGAIN; |
283 | ||
284 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 285 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 286 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
287 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
288 | ||
8ef2ce3e | 289 | new_pos = desc->current_index + i; |
0c030806 TM |
290 | if (ctx->attr_gencount != nfsi->attr_gencount |
291 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { | |
292 | ctx->duped = 0; | |
293 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 294 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
295 | if (ctx->duped > 0 |
296 | && ctx->dup_cookie == *desc->dir_cookie) { | |
297 | if (printk_ratelimit()) { | |
298 | pr_notice("NFS: directory %s/%s contains a readdir loop." | |
299 | "Please contact your server vendor. " | |
374e4e3e | 300 | "The file: %s has duplicate cookie %llu\n", |
0c030806 TM |
301 | desc->file->f_dentry->d_parent->d_name.name, |
302 | desc->file->f_dentry->d_name.name, | |
374e4e3e | 303 | array->array[i].string.name, |
0c030806 TM |
304 | *desc->dir_cookie); |
305 | } | |
306 | status = -ELOOP; | |
307 | goto out; | |
308 | } | |
8ef2ce3e | 309 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 310 | ctx->duped = -1; |
8ef2ce3e | 311 | } |
23db8620 | 312 | desc->ctx->pos = new_pos; |
d1bacf9e | 313 | desc->cache_entry_index = i; |
47c716cb | 314 | return 0; |
d1bacf9e BS |
315 | } |
316 | } | |
47c716cb | 317 | if (array->eof_index >= 0) { |
8cd51a0c | 318 | status = -EBADCOOKIE; |
18fb5fe4 TM |
319 | if (*desc->dir_cookie == array->last_cookie) |
320 | desc->eof = 1; | |
8cd51a0c | 321 | } |
0c030806 | 322 | out: |
d1bacf9e BS |
323 | return status; |
324 | } | |
325 | ||
326 | static | |
327 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
328 | { | |
329 | struct nfs_cache_array *array; | |
47c716cb | 330 | int status; |
d1bacf9e BS |
331 | |
332 | array = nfs_readdir_get_array(desc->page); | |
333 | if (IS_ERR(array)) { | |
334 | status = PTR_ERR(array); | |
335 | goto out; | |
336 | } | |
337 | ||
338 | if (*desc->dir_cookie == 0) | |
339 | status = nfs_readdir_search_for_pos(array, desc); | |
340 | else | |
341 | status = nfs_readdir_search_for_cookie(array, desc); | |
342 | ||
47c716cb | 343 | if (status == -EAGAIN) { |
0aded708 | 344 | desc->last_cookie = array->last_cookie; |
e47c085a | 345 | desc->current_index += array->size; |
47c716cb TM |
346 | desc->page_index++; |
347 | } | |
d1bacf9e BS |
348 | nfs_readdir_release_array(desc->page); |
349 | out: | |
350 | return status; | |
351 | } | |
352 | ||
353 | /* Fill a page with xdr information before transferring to the cache page */ | |
354 | static | |
56e4ebf8 | 355 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 356 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 357 | { |
480c2006 BS |
358 | struct nfs_open_dir_context *ctx = file->private_data; |
359 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 360 | unsigned long timestamp, gencount; |
1da177e4 LT |
361 | int error; |
362 | ||
1da177e4 LT |
363 | again: |
364 | timestamp = jiffies; | |
4704f0e2 | 365 | gencount = nfs_inc_attr_generation_counter(); |
56e4ebf8 | 366 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
1da177e4 LT |
367 | NFS_SERVER(inode)->dtsize, desc->plus); |
368 | if (error < 0) { | |
369 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
370 | if (error == -ENOTSUPP && desc->plus) { | |
371 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 372 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
373 | desc->plus = 0; |
374 | goto again; | |
375 | } | |
376 | goto error; | |
377 | } | |
1f4eab7e | 378 | desc->timestamp = timestamp; |
4704f0e2 | 379 | desc->gencount = gencount; |
d1bacf9e BS |
380 | error: |
381 | return error; | |
1da177e4 LT |
382 | } |
383 | ||
573c4e1e CL |
384 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
385 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 386 | { |
573c4e1e | 387 | int error; |
1da177e4 | 388 | |
573c4e1e CL |
389 | error = desc->decode(xdr, entry, desc->plus); |
390 | if (error) | |
391 | return error; | |
d1bacf9e BS |
392 | entry->fattr->time_start = desc->timestamp; |
393 | entry->fattr->gencount = desc->gencount; | |
394 | return 0; | |
1da177e4 LT |
395 | } |
396 | ||
d39ab9de BS |
397 | static |
398 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
399 | { | |
d39ab9de BS |
400 | if (dentry->d_inode == NULL) |
401 | goto different; | |
37a09f07 | 402 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
d39ab9de BS |
403 | goto different; |
404 | return 1; | |
405 | different: | |
406 | return 0; | |
407 | } | |
408 | ||
d69ee9b8 | 409 | static |
23db8620 | 410 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
411 | { |
412 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
413 | return false; | |
414 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
415 | return true; | |
23db8620 | 416 | if (ctx->pos == 0) |
d69ee9b8 TM |
417 | return true; |
418 | return false; | |
419 | } | |
420 | ||
421 | /* | |
422 | * This function is called by the lookup code to request the use of | |
423 | * readdirplus to accelerate any future lookups in the same | |
424 | * directory. | |
425 | */ | |
426 | static | |
427 | void nfs_advise_use_readdirplus(struct inode *dir) | |
428 | { | |
429 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
430 | } | |
431 | ||
d39ab9de BS |
432 | static |
433 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
434 | { | |
26fe5750 | 435 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
4a201d6e TM |
436 | struct dentry *dentry; |
437 | struct dentry *alias; | |
d39ab9de BS |
438 | struct inode *dir = parent->d_inode; |
439 | struct inode *inode; | |
aa9c2669 | 440 | int status; |
d39ab9de | 441 | |
4a201d6e TM |
442 | if (filename.name[0] == '.') { |
443 | if (filename.len == 1) | |
444 | return; | |
445 | if (filename.len == 2 && filename.name[1] == '.') | |
446 | return; | |
447 | } | |
448 | filename.hash = full_name_hash(filename.name, filename.len); | |
d39ab9de | 449 | |
4a201d6e | 450 | dentry = d_lookup(parent, &filename); |
d39ab9de BS |
451 | if (dentry != NULL) { |
452 | if (nfs_same_file(dentry, entry)) { | |
cda57a1e | 453 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
aa9c2669 DQ |
454 | status = nfs_refresh_inode(dentry->d_inode, entry->fattr); |
455 | if (!status) | |
456 | nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label); | |
d39ab9de BS |
457 | goto out; |
458 | } else { | |
696199f8 AV |
459 | if (d_invalidate(dentry) != 0) |
460 | goto out; | |
d39ab9de BS |
461 | dput(dentry); |
462 | } | |
463 | } | |
464 | ||
465 | dentry = d_alloc(parent, &filename); | |
4a201d6e TM |
466 | if (dentry == NULL) |
467 | return; | |
468 | ||
1775fd3e | 469 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
d39ab9de BS |
470 | if (IS_ERR(inode)) |
471 | goto out; | |
472 | ||
473 | alias = d_materialise_unique(dentry, inode); | |
474 | if (IS_ERR(alias)) | |
475 | goto out; | |
476 | else if (alias) { | |
477 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); | |
478 | dput(alias); | |
479 | } else | |
480 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
481 | ||
482 | out: | |
483 | dput(dentry); | |
d39ab9de BS |
484 | } |
485 | ||
d1bacf9e BS |
486 | /* Perform conversion from xdr to cache array */ |
487 | static | |
8cd51a0c | 488 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 489 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 490 | { |
babddc72 | 491 | struct xdr_stream stream; |
f7da7a12 | 492 | struct xdr_buf buf; |
6650239a | 493 | struct page *scratch; |
99424380 | 494 | struct nfs_cache_array *array; |
5c346854 TM |
495 | unsigned int count = 0; |
496 | int status; | |
babddc72 | 497 | |
6650239a TM |
498 | scratch = alloc_page(GFP_KERNEL); |
499 | if (scratch == NULL) | |
500 | return -ENOMEM; | |
babddc72 | 501 | |
f7da7a12 | 502 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 503 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
504 | |
505 | do { | |
506 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
507 | if (status != 0) { |
508 | if (status == -EAGAIN) | |
509 | status = 0; | |
99424380 | 510 | break; |
8cd51a0c | 511 | } |
99424380 | 512 | |
5c346854 TM |
513 | count++; |
514 | ||
47c716cb | 515 | if (desc->plus != 0) |
d39ab9de | 516 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
8cd51a0c TM |
517 | |
518 | status = nfs_readdir_add_to_array(entry, page); | |
519 | if (status != 0) | |
520 | break; | |
99424380 BS |
521 | } while (!entry->eof); |
522 | ||
47c716cb | 523 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 524 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
525 | if (!IS_ERR(array)) { |
526 | array->eof_index = array->size; | |
527 | status = 0; | |
528 | nfs_readdir_release_array(page); | |
5c346854 TM |
529 | } else |
530 | status = PTR_ERR(array); | |
1da177e4 | 531 | } |
6650239a TM |
532 | |
533 | put_page(scratch); | |
8cd51a0c | 534 | return status; |
56e4ebf8 BS |
535 | } |
536 | ||
537 | static | |
538 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) | |
539 | { | |
540 | unsigned int i; | |
541 | for (i = 0; i < npages; i++) | |
542 | put_page(pages[i]); | |
543 | } | |
544 | ||
545 | static | |
546 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, | |
547 | unsigned int npages) | |
548 | { | |
56e4ebf8 BS |
549 | nfs_readdir_free_pagearray(pages, npages); |
550 | } | |
551 | ||
552 | /* | |
553 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
554 | * to nfs_readdir_free_large_page | |
555 | */ | |
556 | static | |
6650239a | 557 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
56e4ebf8 | 558 | { |
56e4ebf8 BS |
559 | unsigned int i; |
560 | ||
561 | for (i = 0; i < npages; i++) { | |
562 | struct page *page = alloc_page(GFP_KERNEL); | |
563 | if (page == NULL) | |
564 | goto out_freepages; | |
565 | pages[i] = page; | |
566 | } | |
6650239a | 567 | return 0; |
56e4ebf8 | 568 | |
56e4ebf8 BS |
569 | out_freepages: |
570 | nfs_readdir_free_pagearray(pages, i); | |
6650239a | 571 | return -ENOMEM; |
1da177e4 LT |
572 | } |
573 | ||
d1bacf9e BS |
574 | static |
575 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 576 | { |
56e4ebf8 BS |
577 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
578 | void *pages_ptr = NULL; | |
d1bacf9e BS |
579 | struct nfs_entry entry; |
580 | struct file *file = desc->file; | |
581 | struct nfs_cache_array *array; | |
8cd51a0c | 582 | int status = -ENOMEM; |
56e4ebf8 | 583 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
584 | |
585 | entry.prev_cookie = 0; | |
0aded708 | 586 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
587 | entry.eof = 0; |
588 | entry.fh = nfs_alloc_fhandle(); | |
589 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 590 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
591 | if (entry.fh == NULL || entry.fattr == NULL) |
592 | goto out; | |
00a92642 | 593 | |
14c43f76 DQ |
594 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
595 | if (IS_ERR(entry.label)) { | |
596 | status = PTR_ERR(entry.label); | |
597 | goto out; | |
598 | } | |
599 | ||
d1bacf9e | 600 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
601 | if (IS_ERR(array)) { |
602 | status = PTR_ERR(array); | |
14c43f76 | 603 | goto out_label_free; |
8cd51a0c | 604 | } |
d1bacf9e BS |
605 | memset(array, 0, sizeof(struct nfs_cache_array)); |
606 | array->eof_index = -1; | |
00a92642 | 607 | |
6650239a TM |
608 | status = nfs_readdir_large_page(pages, array_size); |
609 | if (status < 0) | |
d1bacf9e BS |
610 | goto out_release_array; |
611 | do { | |
ac396128 | 612 | unsigned int pglen; |
56e4ebf8 | 613 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 614 | |
d1bacf9e | 615 | if (status < 0) |
00a92642 | 616 | break; |
ac396128 | 617 | pglen = status; |
6650239a | 618 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
619 | if (status < 0) { |
620 | if (status == -ENOSPC) | |
621 | status = 0; | |
622 | break; | |
623 | } | |
624 | } while (array->eof_index < 0); | |
d1bacf9e | 625 | |
56e4ebf8 | 626 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
d1bacf9e BS |
627 | out_release_array: |
628 | nfs_readdir_release_array(page); | |
14c43f76 DQ |
629 | out_label_free: |
630 | nfs4_label_free(entry.label); | |
d1bacf9e BS |
631 | out: |
632 | nfs_free_fattr(entry.fattr); | |
633 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
634 | return status; |
635 | } | |
636 | ||
637 | /* | |
d1bacf9e BS |
638 | * Now we cache directories properly, by converting xdr information |
639 | * to an array that can be used for lookups later. This results in | |
640 | * fewer cache pages, since we can store more information on each page. | |
641 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 642 | */ |
d1bacf9e BS |
643 | static |
644 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 645 | { |
496ad9aa | 646 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 647 | int ret; |
1da177e4 | 648 | |
8cd51a0c TM |
649 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
650 | if (ret < 0) | |
d1bacf9e BS |
651 | goto error; |
652 | SetPageUptodate(page); | |
1da177e4 | 653 | |
d1bacf9e BS |
654 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
655 | /* Should never happen */ | |
656 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 657 | } |
d1bacf9e BS |
658 | unlock_page(page); |
659 | return 0; | |
660 | error: | |
661 | unlock_page(page); | |
8cd51a0c | 662 | return ret; |
d1bacf9e | 663 | } |
1da177e4 | 664 | |
d1bacf9e BS |
665 | static |
666 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
667 | { | |
11de3b11 TM |
668 | if (!desc->page->mapping) |
669 | nfs_readdir_clear_array(desc->page); | |
d1bacf9e BS |
670 | page_cache_release(desc->page); |
671 | desc->page = NULL; | |
672 | } | |
673 | ||
674 | static | |
675 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
676 | { | |
496ad9aa | 677 | return read_cache_page(file_inode(desc->file)->i_mapping, |
d1bacf9e | 678 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
679 | } |
680 | ||
681 | /* | |
d1bacf9e | 682 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 683 | */ |
d1bacf9e BS |
684 | static |
685 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
686 | { | |
687 | int res; | |
688 | ||
689 | desc->page = get_cache_page(desc); | |
690 | if (IS_ERR(desc->page)) | |
691 | return PTR_ERR(desc->page); | |
692 | ||
693 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
694 | if (res != 0) |
695 | cache_page_release(desc); | |
d1bacf9e BS |
696 | return res; |
697 | } | |
698 | ||
699 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
700 | static inline |
701 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
702 | { | |
8cd51a0c | 703 | int res; |
d1bacf9e | 704 | |
0aded708 | 705 | if (desc->page_index == 0) { |
8cd51a0c | 706 | desc->current_index = 0; |
0aded708 TM |
707 | desc->last_cookie = 0; |
708 | } | |
47c716cb | 709 | do { |
d1bacf9e | 710 | res = find_cache_page(desc); |
47c716cb | 711 | } while (res == -EAGAIN); |
1da177e4 LT |
712 | return res; |
713 | } | |
714 | ||
1da177e4 LT |
715 | /* |
716 | * Once we've found the start of the dirent within a page: fill 'er up... | |
717 | */ | |
718 | static | |
23db8620 | 719 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
720 | { |
721 | struct file *file = desc->file; | |
d1bacf9e BS |
722 | int i = 0; |
723 | int res = 0; | |
724 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
725 | struct nfs_open_dir_context *ctx = file->private_data; |
726 | ||
d1bacf9e | 727 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
728 | if (IS_ERR(array)) { |
729 | res = PTR_ERR(array); | |
730 | goto out; | |
731 | } | |
d1bacf9e BS |
732 | |
733 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 734 | struct nfs_cache_array_entry *ent; |
1da177e4 | 735 | |
ece0b423 | 736 | ent = &array->array[i]; |
23db8620 AV |
737 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
738 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 739 | desc->eof = 1; |
1da177e4 | 740 | break; |
ece0b423 | 741 | } |
23db8620 | 742 | desc->ctx->pos++; |
d1bacf9e BS |
743 | if (i < (array->size-1)) |
744 | *desc->dir_cookie = array->array[i+1].cookie; | |
745 | else | |
746 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
747 | if (ctx->duped != 0) |
748 | ctx->duped = 1; | |
1da177e4 | 749 | } |
47c716cb | 750 | if (array->eof_index >= 0) |
8cd51a0c | 751 | desc->eof = 1; |
d1bacf9e BS |
752 | |
753 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 754 | out: |
d1bacf9e | 755 | cache_page_release(desc); |
1e7cb3dc CL |
756 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
757 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
758 | return res; |
759 | } | |
760 | ||
761 | /* | |
762 | * If we cannot find a cookie in our cache, we suspect that this is | |
763 | * because it points to a deleted file, so we ask the server to return | |
764 | * whatever it thinks is the next entry. We then feed this to filldir. | |
765 | * If all goes well, we should then be able to find our way round the | |
766 | * cache on the next call to readdir_search_pagecache(); | |
767 | * | |
768 | * NOTE: we cannot add the anonymous page to the pagecache because | |
769 | * the data it contains might not be page aligned. Besides, | |
770 | * we should already have a complete representation of the | |
771 | * directory in the page cache by the time we get here. | |
772 | */ | |
773 | static inline | |
23db8620 | 774 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 775 | { |
1da177e4 LT |
776 | struct page *page = NULL; |
777 | int status; | |
496ad9aa | 778 | struct inode *inode = file_inode(desc->file); |
0c030806 | 779 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 780 | |
1e7cb3dc CL |
781 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
782 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
783 | |
784 | page = alloc_page(GFP_HIGHUSER); | |
785 | if (!page) { | |
786 | status = -ENOMEM; | |
787 | goto out; | |
788 | } | |
d1bacf9e | 789 | |
7a8e1dc3 | 790 | desc->page_index = 0; |
0aded708 | 791 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 792 | desc->page = page; |
0c030806 | 793 | ctx->duped = 0; |
7a8e1dc3 | 794 | |
85f8607e TM |
795 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
796 | if (status < 0) | |
1da177e4 LT |
797 | goto out_release; |
798 | ||
23db8620 | 799 | status = nfs_do_filldir(desc); |
1da177e4 | 800 | |
1da177e4 | 801 | out: |
1e7cb3dc | 802 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 803 | __func__, status); |
1da177e4 LT |
804 | return status; |
805 | out_release: | |
d1bacf9e | 806 | cache_page_release(desc); |
1da177e4 LT |
807 | goto out; |
808 | } | |
809 | ||
00a92642 OG |
810 | /* The file offset position represents the dirent entry number. A |
811 | last cookie cache takes care of the common case of reading the | |
812 | whole directory. | |
1da177e4 | 813 | */ |
23db8620 | 814 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 815 | { |
23db8620 | 816 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
817 | struct inode *inode = dentry->d_inode; |
818 | nfs_readdir_descriptor_t my_desc, | |
819 | *desc = &my_desc; | |
23db8620 | 820 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 821 | int res = 0; |
1da177e4 | 822 | |
6da24bc9 | 823 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
1e7cb3dc | 824 | dentry->d_parent->d_name.name, dentry->d_name.name, |
23db8620 | 825 | (long long)ctx->pos); |
91d5b470 CL |
826 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
827 | ||
1da177e4 | 828 | /* |
23db8620 | 829 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 830 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
831 | * to either find the entry with the appropriate number or |
832 | * revalidate the cookie. | |
1da177e4 LT |
833 | */ |
834 | memset(desc, 0, sizeof(*desc)); | |
835 | ||
23db8620 AV |
836 | desc->file = file; |
837 | desc->ctx = ctx; | |
480c2006 | 838 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 839 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 840 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 841 | |
565277f6 | 842 | nfs_block_sillyrename(dentry); |
07b5ce8e SM |
843 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) |
844 | res = nfs_revalidate_mapping(inode, file->f_mapping); | |
fccca7fc TM |
845 | if (res < 0) |
846 | goto out; | |
847 | ||
47c716cb | 848 | do { |
1da177e4 | 849 | res = readdir_search_pagecache(desc); |
00a92642 | 850 | |
1da177e4 | 851 | if (res == -EBADCOOKIE) { |
ece0b423 | 852 | res = 0; |
1da177e4 | 853 | /* This means either end of directory */ |
d1bacf9e | 854 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 855 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 856 | res = uncached_readdir(desc); |
ece0b423 | 857 | if (res == 0) |
1da177e4 LT |
858 | continue; |
859 | } | |
1da177e4 LT |
860 | break; |
861 | } | |
862 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 863 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 864 | nfs_zap_caches(inode); |
baf57a09 | 865 | desc->page_index = 0; |
1da177e4 | 866 | desc->plus = 0; |
d1bacf9e | 867 | desc->eof = 0; |
1da177e4 LT |
868 | continue; |
869 | } | |
870 | if (res < 0) | |
871 | break; | |
872 | ||
23db8620 | 873 | res = nfs_do_filldir(desc); |
ece0b423 | 874 | if (res < 0) |
1da177e4 | 875 | break; |
47c716cb | 876 | } while (!desc->eof); |
fccca7fc | 877 | out: |
565277f6 | 878 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
879 | if (res > 0) |
880 | res = 0; | |
aa49b4cf | 881 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
1e7cb3dc CL |
882 | dentry->d_parent->d_name.name, dentry->d_name.name, |
883 | res); | |
884 | return res; | |
1da177e4 LT |
885 | } |
886 | ||
965c8e59 | 887 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 888 | { |
b84e06c5 CL |
889 | struct dentry *dentry = filp->f_path.dentry; |
890 | struct inode *inode = dentry->d_inode; | |
480c2006 | 891 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 892 | |
6da24bc9 | 893 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
894 | dentry->d_parent->d_name.name, |
895 | dentry->d_name.name, | |
965c8e59 | 896 | offset, whence); |
b84e06c5 CL |
897 | |
898 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 899 | switch (whence) { |
f0dd2136 TM |
900 | case 1: |
901 | offset += filp->f_pos; | |
902 | case 0: | |
903 | if (offset >= 0) | |
904 | break; | |
905 | default: | |
906 | offset = -EINVAL; | |
907 | goto out; | |
908 | } | |
909 | if (offset != filp->f_pos) { | |
910 | filp->f_pos = offset; | |
480c2006 | 911 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 912 | dir_ctx->duped = 0; |
f0dd2136 TM |
913 | } |
914 | out: | |
b84e06c5 | 915 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
916 | return offset; |
917 | } | |
918 | ||
1da177e4 LT |
919 | /* |
920 | * All directory operations under NFS are synchronous, so fsync() | |
921 | * is a dummy operation. | |
922 | */ | |
02c24a82 JB |
923 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
924 | int datasync) | |
1da177e4 | 925 | { |
7ea80859 | 926 | struct dentry *dentry = filp->f_path.dentry; |
02c24a82 | 927 | struct inode *inode = dentry->d_inode; |
7ea80859 | 928 | |
6da24bc9 | 929 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
1e7cb3dc CL |
930 | dentry->d_parent->d_name.name, dentry->d_name.name, |
931 | datasync); | |
932 | ||
02c24a82 | 933 | mutex_lock(&inode->i_mutex); |
54917786 | 934 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
02c24a82 | 935 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
936 | return 0; |
937 | } | |
938 | ||
bfc69a45 TM |
939 | /** |
940 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
941 | * @dir - pointer to directory inode | |
942 | * | |
943 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
944 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
945 | * on the server that might have invalidated our dcache. | |
946 | * | |
947 | * The caller should be holding dir->i_lock | |
948 | */ | |
949 | void nfs_force_lookup_revalidate(struct inode *dir) | |
950 | { | |
011935a0 | 951 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 952 | } |
89d77c8f | 953 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 954 | |
1da177e4 LT |
955 | /* |
956 | * A check for whether or not the parent directory has changed. | |
957 | * In the case it has, we assume that the dentries are untrustworthy | |
958 | * and may need to be looked up again. | |
959 | */ | |
c79ba787 | 960 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
961 | { |
962 | if (IS_ROOT(dentry)) | |
963 | return 1; | |
4eec952e TM |
964 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
965 | return 0; | |
f2c77f4e TM |
966 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
967 | return 0; | |
968 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
969 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
970 | return 0; | |
971 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
972 | return 0; | |
973 | return 1; | |
1da177e4 LT |
974 | } |
975 | ||
a12802ca TM |
976 | /* |
977 | * Use intent information to check whether or not we're going to do | |
978 | * an O_EXCL create using this path component. | |
979 | */ | |
fa3c56bb | 980 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
981 | { |
982 | if (NFS_PROTO(dir)->version == 2) | |
983 | return 0; | |
fa3c56bb | 984 | return flags & LOOKUP_EXCL; |
a12802ca TM |
985 | } |
986 | ||
1d6757fb TM |
987 | /* |
988 | * Inode and filehandle revalidation for lookups. | |
989 | * | |
990 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
991 | * or if the intent information indicates that we're about to open this | |
992 | * particular file and the "nocto" mount flag is not set. | |
993 | * | |
994 | */ | |
65a0c149 | 995 | static |
fa3c56bb | 996 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
997 | { |
998 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 999 | int ret; |
1da177e4 | 1000 | |
36d43a43 | 1001 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1002 | return 0; |
facc3530 | 1003 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1004 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1005 | goto out_force; |
1006 | /* This is an open(2) */ | |
fa3c56bb AV |
1007 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1008 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1009 | goto out_force; |
65a0c149 TM |
1010 | out: |
1011 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1012 | out_force: |
65a0c149 TM |
1013 | ret = __nfs_revalidate_inode(server, inode); |
1014 | if (ret != 0) | |
1015 | return ret; | |
1016 | goto out; | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * We judge how long we want to trust negative | |
1021 | * dentries by looking at the parent inode mtime. | |
1022 | * | |
1023 | * If parent mtime has changed, we revalidate, else we wait for a | |
1024 | * period corresponding to the parent's attribute cache timeout value. | |
1025 | */ | |
1026 | static inline | |
1027 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1028 | unsigned int flags) |
1da177e4 | 1029 | { |
1da177e4 | 1030 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1031 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1032 | return 0; |
4eec952e TM |
1033 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1034 | return 1; | |
1da177e4 LT |
1035 | return !nfs_check_verifier(dir, dentry); |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * This is called every time the dcache has a lookup hit, | |
1040 | * and we should check whether we can really trust that | |
1041 | * lookup. | |
1042 | * | |
1043 | * NOTE! The hit can be a negative hit too, don't assume | |
1044 | * we have an inode! | |
1045 | * | |
1046 | * If the parent directory is seen to have changed, we throw out the | |
1047 | * cached dentry and do a new lookup. | |
1048 | */ | |
0b728e19 | 1049 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1050 | { |
1051 | struct inode *dir; | |
1052 | struct inode *inode; | |
1053 | struct dentry *parent; | |
e1fb4d05 TM |
1054 | struct nfs_fh *fhandle = NULL; |
1055 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1056 | struct nfs4_label *label = NULL; |
1da177e4 | 1057 | int error; |
1da177e4 | 1058 | |
fa3c56bb | 1059 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1060 | return -ECHILD; |
1061 | ||
1da177e4 | 1062 | parent = dget_parent(dentry); |
1da177e4 | 1063 | dir = parent->d_inode; |
91d5b470 | 1064 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1065 | inode = dentry->d_inode; |
1066 | ||
1067 | if (!inode) { | |
fa3c56bb | 1068 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1069 | goto out_bad; |
d69ee9b8 | 1070 | goto out_valid_noent; |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | if (is_bad_inode(inode)) { | |
1e7cb3dc | 1074 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
3110ff80 | 1075 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1076 | dentry->d_name.name); |
1da177e4 LT |
1077 | goto out_bad; |
1078 | } | |
1079 | ||
011e2a7f | 1080 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1081 | goto out_set_verifier; |
1082 | ||
1da177e4 | 1083 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1084 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1085 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1086 | goto out_zap_parent; |
1087 | goto out_valid; | |
1088 | } | |
1089 | ||
1090 | if (NFS_STALE(inode)) | |
1091 | goto out_bad; | |
1092 | ||
e1fb4d05 TM |
1093 | error = -ENOMEM; |
1094 | fhandle = nfs_alloc_fhandle(); | |
1095 | fattr = nfs_alloc_fattr(); | |
1096 | if (fhandle == NULL || fattr == NULL) | |
1097 | goto out_error; | |
1098 | ||
14c43f76 DQ |
1099 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1100 | if (IS_ERR(label)) | |
1101 | goto out_error; | |
1102 | ||
1775fd3e | 1103 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1104 | if (error) |
1105 | goto out_bad; | |
e1fb4d05 | 1106 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1107 | goto out_bad; |
e1fb4d05 | 1108 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1109 | goto out_bad; |
1110 | ||
aa9c2669 DQ |
1111 | nfs_setsecurity(inode, fattr, label); |
1112 | ||
e1fb4d05 TM |
1113 | nfs_free_fattr(fattr); |
1114 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1115 | nfs4_label_free(label); |
1116 | ||
15860ab1 | 1117 | out_set_verifier: |
cf8ba45e | 1118 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1119 | out_valid: |
d69ee9b8 TM |
1120 | /* Success: notify readdir to use READDIRPLUS */ |
1121 | nfs_advise_use_readdirplus(dir); | |
1122 | out_valid_noent: | |
1da177e4 | 1123 | dput(parent); |
1e7cb3dc | 1124 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
3110ff80 | 1125 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1126 | dentry->d_name.name); |
1da177e4 LT |
1127 | return 1; |
1128 | out_zap_parent: | |
1129 | nfs_zap_caches(dir); | |
1130 | out_bad: | |
c44600c9 AV |
1131 | nfs_free_fattr(fattr); |
1132 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1133 | nfs4_label_free(label); |
a1643a92 | 1134 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1135 | if (inode && S_ISDIR(inode->i_mode)) { |
1136 | /* Purge readdir caches. */ | |
1137 | nfs_zap_caches(inode); | |
1138 | /* If we have submounts, don't unhash ! */ | |
1139 | if (have_submounts(dentry)) | |
1140 | goto out_valid; | |
d9e80b7d AV |
1141 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1142 | goto out_valid; | |
1da177e4 LT |
1143 | shrink_dcache_parent(dentry); |
1144 | } | |
1145 | d_drop(dentry); | |
1da177e4 | 1146 | dput(parent); |
1e7cb3dc | 1147 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
3110ff80 | 1148 | __func__, dentry->d_parent->d_name.name, |
1e7cb3dc | 1149 | dentry->d_name.name); |
1da177e4 | 1150 | return 0; |
e1fb4d05 TM |
1151 | out_error: |
1152 | nfs_free_fattr(fattr); | |
1153 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1154 | nfs4_label_free(label); |
e1fb4d05 TM |
1155 | dput(parent); |
1156 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", | |
1157 | __func__, dentry->d_parent->d_name.name, | |
1158 | dentry->d_name.name, error); | |
1159 | return error; | |
1da177e4 LT |
1160 | } |
1161 | ||
ecf3d1f1 JL |
1162 | /* |
1163 | * A weaker form of d_revalidate for revalidating just the dentry->d_inode | |
1164 | * when we don't really care about the dentry name. This is called when a | |
1165 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1166 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1167 | * | |
1168 | * In this situation, we just want to verify that the inode itself is OK | |
1169 | * since the dentry might have changed on the server. | |
1170 | */ | |
1171 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1172 | { | |
1173 | int error; | |
1174 | struct inode *inode = dentry->d_inode; | |
1175 | ||
1176 | /* | |
1177 | * I believe we can only get a negative dentry here in the case of a | |
1178 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1179 | * eventually need to do something more here. | |
1180 | */ | |
1181 | if (!inode) { | |
1182 | dfprintk(LOOKUPCACHE, "%s: %s/%s has negative inode\n", | |
1183 | __func__, dentry->d_parent->d_name.name, | |
1184 | dentry->d_name.name); | |
1185 | return 1; | |
1186 | } | |
1187 | ||
1188 | if (is_bad_inode(inode)) { | |
1189 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", | |
1190 | __func__, dentry->d_parent->d_name.name, | |
1191 | dentry->d_name.name); | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1196 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1197 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1198 | return !error; | |
1199 | } | |
1200 | ||
1da177e4 LT |
1201 | /* |
1202 | * This is called from dput() when d_count is going to 0. | |
1203 | */ | |
fe15ce44 | 1204 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 LT |
1205 | { |
1206 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", | |
1207 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
1208 | dentry->d_flags); | |
1209 | ||
77f11192 TM |
1210 | /* Unhash any dentry with a stale inode */ |
1211 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1212 | return 1; | |
1213 | ||
1da177e4 LT |
1214 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1215 | /* Unhash it, so that ->d_iput() would be called */ | |
1216 | return 1; | |
1217 | } | |
1218 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1219 | /* Unhash it, so that ancestors of killed async unlink | |
1220 | * files will be cleaned up during umount */ | |
1221 | return 1; | |
1222 | } | |
1223 | return 0; | |
1224 | ||
1225 | } | |
1226 | ||
1f018458 | 1227 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1228 | static void nfs_drop_nlink(struct inode *inode) |
1229 | { | |
1230 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1231 | /* drop the inode if we're reasonably sure this is the last link */ |
1232 | if (inode->i_nlink == 1) | |
1233 | clear_nlink(inode); | |
1234 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1235 | spin_unlock(&inode->i_lock); |
1236 | } | |
1237 | ||
1da177e4 LT |
1238 | /* |
1239 | * Called when the dentry loses inode. | |
1240 | * We use it to clean up silly-renamed files. | |
1241 | */ | |
1242 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1243 | { | |
83672d39 NB |
1244 | if (S_ISDIR(inode->i_mode)) |
1245 | /* drop any readdir cache as it could easily be old */ | |
1246 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1247 | ||
1da177e4 | 1248 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1249 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1250 | nfs_drop_nlink(inode); |
1da177e4 | 1251 | } |
1da177e4 LT |
1252 | iput(inode); |
1253 | } | |
1254 | ||
b1942c5f AV |
1255 | static void nfs_d_release(struct dentry *dentry) |
1256 | { | |
1257 | /* free cached devname value, if it survived that far */ | |
1258 | if (unlikely(dentry->d_fsdata)) { | |
1259 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1260 | WARN_ON(1); | |
1261 | else | |
1262 | kfree(dentry->d_fsdata); | |
1263 | } | |
1264 | } | |
1265 | ||
f786aa90 | 1266 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1267 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1268 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1269 | .d_delete = nfs_dentry_delete, |
1270 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1271 | .d_automount = nfs_d_automount, |
b1942c5f | 1272 | .d_release = nfs_d_release, |
1da177e4 | 1273 | }; |
ddda8e0a | 1274 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1275 | |
597d9289 | 1276 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1277 | { |
1278 | struct dentry *res; | |
565277f6 | 1279 | struct dentry *parent; |
1da177e4 | 1280 | struct inode *inode = NULL; |
e1fb4d05 TM |
1281 | struct nfs_fh *fhandle = NULL; |
1282 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1283 | struct nfs4_label *label = NULL; |
1da177e4 | 1284 | int error; |
1da177e4 LT |
1285 | |
1286 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", | |
1287 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
91d5b470 | 1288 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1289 | |
1290 | res = ERR_PTR(-ENAMETOOLONG); | |
1291 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1292 | goto out; | |
1293 | ||
fd684071 TM |
1294 | /* |
1295 | * If we're doing an exclusive create, optimize away the lookup | |
1296 | * but don't hash the dentry. | |
1297 | */ | |
00cd8dd3 | 1298 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1299 | d_instantiate(dentry, NULL); |
1300 | res = NULL; | |
fc0f684c | 1301 | goto out; |
fd684071 | 1302 | } |
1da177e4 | 1303 | |
e1fb4d05 TM |
1304 | res = ERR_PTR(-ENOMEM); |
1305 | fhandle = nfs_alloc_fhandle(); | |
1306 | fattr = nfs_alloc_fattr(); | |
1307 | if (fhandle == NULL || fattr == NULL) | |
1308 | goto out; | |
1309 | ||
14c43f76 DQ |
1310 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1311 | if (IS_ERR(label)) | |
1312 | goto out; | |
1313 | ||
565277f6 TM |
1314 | parent = dentry->d_parent; |
1315 | /* Protect against concurrent sillydeletes */ | |
1316 | nfs_block_sillyrename(parent); | |
1775fd3e | 1317 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1318 | if (error == -ENOENT) |
1319 | goto no_entry; | |
1320 | if (error < 0) { | |
1321 | res = ERR_PTR(error); | |
565277f6 | 1322 | goto out_unblock_sillyrename; |
1da177e4 | 1323 | } |
1775fd3e | 1324 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1325 | res = ERR_CAST(inode); |
03f28e3a | 1326 | if (IS_ERR(res)) |
565277f6 | 1327 | goto out_unblock_sillyrename; |
54ceac45 | 1328 | |
d69ee9b8 TM |
1329 | /* Success: notify readdir to use READDIRPLUS */ |
1330 | nfs_advise_use_readdirplus(dir); | |
1331 | ||
1da177e4 | 1332 | no_entry: |
54ceac45 | 1333 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1334 | if (res != NULL) { |
1335 | if (IS_ERR(res)) | |
565277f6 | 1336 | goto out_unblock_sillyrename; |
1da177e4 | 1337 | dentry = res; |
9eaef27b | 1338 | } |
1da177e4 | 1339 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1340 | out_unblock_sillyrename: |
1341 | nfs_unblock_sillyrename(parent); | |
14c43f76 | 1342 | nfs4_label_free(label); |
1da177e4 | 1343 | out: |
e1fb4d05 TM |
1344 | nfs_free_fattr(fattr); |
1345 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1346 | return res; |
1347 | } | |
ddda8e0a | 1348 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1349 | |
89d77c8f | 1350 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1351 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1352 | |
f786aa90 | 1353 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1354 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1355 | .d_delete = nfs_dentry_delete, |
1356 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1357 | .d_automount = nfs_d_automount, |
b1942c5f | 1358 | .d_release = nfs_d_release, |
1da177e4 | 1359 | }; |
89d77c8f | 1360 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1361 | |
8a5e929d AV |
1362 | static fmode_t flags_to_mode(int flags) |
1363 | { | |
1364 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1365 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1366 | res |= FMODE_READ; | |
1367 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1368 | res |= FMODE_WRITE; | |
1369 | return res; | |
1370 | } | |
1371 | ||
51141598 | 1372 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1373 | { |
5ede7b1c | 1374 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1375 | } |
1376 | ||
1377 | static int do_open(struct inode *inode, struct file *filp) | |
1378 | { | |
1379 | nfs_fscache_set_inode_cookie(inode, filp); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
d9585277 AV |
1383 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1384 | struct dentry *dentry, | |
30d90494 | 1385 | struct file *file, unsigned open_flags, |
d9585277 | 1386 | int *opened) |
cd9a1c0e | 1387 | { |
0dd2b474 MS |
1388 | int err; |
1389 | ||
30d90494 AV |
1390 | err = finish_open(file, dentry, do_open, opened); |
1391 | if (err) | |
d9585277 | 1392 | goto out; |
30d90494 | 1393 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1394 | |
cd9a1c0e TM |
1395 | out: |
1396 | put_nfs_open_context(ctx); | |
d9585277 | 1397 | return err; |
cd9a1c0e TM |
1398 | } |
1399 | ||
73a79706 BS |
1400 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1401 | struct file *file, unsigned open_flags, | |
1402 | umode_t mode, int *opened) | |
1da177e4 | 1403 | { |
cd9a1c0e | 1404 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1405 | struct dentry *res; |
1406 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1407 | struct inode *inode; |
898f635c | 1408 | int err; |
1da177e4 | 1409 | |
0dd2b474 MS |
1410 | /* Expect a negative dentry */ |
1411 | BUG_ON(dentry->d_inode); | |
1412 | ||
1413 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", | |
1e7cb3dc CL |
1414 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
1415 | ||
0dd2b474 MS |
1416 | /* NFS only supports OPEN on regular files */ |
1417 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1418 | if (!d_unhashed(dentry)) { |
1419 | /* | |
1420 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1421 | * revalidated and is fine, no need to perform lookup | |
1422 | * again | |
1423 | */ | |
d9585277 | 1424 | return -ENOENT; |
0dd2b474 | 1425 | } |
1da177e4 | 1426 | goto no_open; |
02a913a7 | 1427 | } |
1da177e4 | 1428 | |
0dd2b474 | 1429 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1430 | return -ENAMETOOLONG; |
cd9a1c0e | 1431 | |
0dd2b474 | 1432 | if (open_flags & O_CREAT) { |
536e43d1 | 1433 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1434 | attr.ia_mode = mode & ~current_umask(); |
1435 | } | |
536e43d1 TM |
1436 | if (open_flags & O_TRUNC) { |
1437 | attr.ia_valid |= ATTR_SIZE; | |
1438 | attr.ia_size = 0; | |
cd9a1c0e TM |
1439 | } |
1440 | ||
0dd2b474 MS |
1441 | ctx = create_nfs_open_context(dentry, open_flags); |
1442 | err = PTR_ERR(ctx); | |
1443 | if (IS_ERR(ctx)) | |
d9585277 | 1444 | goto out; |
0dd2b474 | 1445 | |
f46e0bd3 | 1446 | nfs_block_sillyrename(dentry->d_parent); |
2b484297 | 1447 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
275bb307 | 1448 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1449 | if (IS_ERR(inode)) { |
cd9a1c0e | 1450 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1451 | err = PTR_ERR(inode); |
1452 | switch (err) { | |
1453 | case -ENOENT: | |
275bb307 | 1454 | d_drop(dentry); |
0dd2b474 MS |
1455 | d_add(dentry, NULL); |
1456 | break; | |
1457 | case -EISDIR: | |
1458 | case -ENOTDIR: | |
1459 | goto no_open; | |
1460 | case -ELOOP: | |
1461 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1462 | goto no_open; |
0dd2b474 | 1463 | break; |
1da177e4 | 1464 | /* case -EINVAL: */ |
0dd2b474 MS |
1465 | default: |
1466 | break; | |
1da177e4 | 1467 | } |
d9585277 | 1468 | goto out; |
cd9a1c0e | 1469 | } |
0dd2b474 | 1470 | |
275bb307 | 1471 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
d9585277 AV |
1472 | out: |
1473 | return err; | |
0dd2b474 | 1474 | |
1da177e4 | 1475 | no_open: |
00cd8dd3 | 1476 | res = nfs_lookup(dir, dentry, 0); |
0dd2b474 MS |
1477 | err = PTR_ERR(res); |
1478 | if (IS_ERR(res)) | |
d9585277 | 1479 | goto out; |
0dd2b474 | 1480 | |
e45198a6 | 1481 | return finish_no_open(file, res); |
1da177e4 | 1482 | } |
89d77c8f | 1483 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1484 | |
0b728e19 | 1485 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1486 | { |
1487 | struct dentry *parent = NULL; | |
657e94b6 | 1488 | struct inode *inode; |
1da177e4 | 1489 | struct inode *dir; |
50de348c | 1490 | int ret = 0; |
1da177e4 | 1491 | |
fa3c56bb | 1492 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1493 | return -ECHILD; |
1494 | ||
fa3c56bb | 1495 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1496 | goto no_open; |
1497 | if (d_mountpoint(dentry)) | |
5584c306 | 1498 | goto no_open; |
49f9a0fa TM |
1499 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1500 | goto no_open; | |
2b484297 | 1501 | |
eda72afb | 1502 | inode = dentry->d_inode; |
1da177e4 LT |
1503 | parent = dget_parent(dentry); |
1504 | dir = parent->d_inode; | |
2b484297 | 1505 | |
1da177e4 LT |
1506 | /* We can't create new files in nfs_open_revalidate(), so we |
1507 | * optimize away revalidation of negative dentries. | |
1508 | */ | |
216d5d06 | 1509 | if (inode == NULL) { |
fa3c56bb | 1510 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1511 | ret = 1; |
1da177e4 | 1512 | goto out; |
216d5d06 TM |
1513 | } |
1514 | ||
1da177e4 LT |
1515 | /* NFS only supports OPEN on regular files */ |
1516 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1517 | goto no_open_dput; |
1da177e4 | 1518 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1519 | if (flags & LOOKUP_EXCL) |
5584c306 | 1520 | goto no_open_dput; |
1da177e4 | 1521 | |
0ef97dcf MS |
1522 | /* Let f_op->open() actually open (and revalidate) the file */ |
1523 | ret = 1; | |
536e43d1 | 1524 | |
1da177e4 LT |
1525 | out: |
1526 | dput(parent); | |
1da177e4 | 1527 | return ret; |
535918f1 | 1528 | |
5584c306 | 1529 | no_open_dput: |
1da177e4 | 1530 | dput(parent); |
5584c306 | 1531 | no_open: |
0b728e19 | 1532 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1533 | } |
1534 | ||
1da177e4 LT |
1535 | #endif /* CONFIG_NFSV4 */ |
1536 | ||
1da177e4 LT |
1537 | /* |
1538 | * Code common to create, mkdir, and mknod. | |
1539 | */ | |
1540 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1541 | struct nfs_fattr *fattr, |
1542 | struct nfs4_label *label) | |
1da177e4 | 1543 | { |
fab728e1 TM |
1544 | struct dentry *parent = dget_parent(dentry); |
1545 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1546 | struct inode *inode; |
1547 | int error = -EACCES; | |
1548 | ||
fab728e1 TM |
1549 | d_drop(dentry); |
1550 | ||
1da177e4 LT |
1551 | /* We may have been initialized further down */ |
1552 | if (dentry->d_inode) | |
fab728e1 | 1553 | goto out; |
1da177e4 | 1554 | if (fhandle->size == 0) { |
1775fd3e | 1555 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1556 | if (error) |
fab728e1 | 1557 | goto out_error; |
1da177e4 | 1558 | } |
5724ab37 | 1559 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1560 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1561 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1562 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1563 | if (error < 0) |
fab728e1 | 1564 | goto out_error; |
1da177e4 | 1565 | } |
1775fd3e | 1566 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1567 | error = PTR_ERR(inode); |
1568 | if (IS_ERR(inode)) | |
fab728e1 TM |
1569 | goto out_error; |
1570 | d_add(dentry, inode); | |
1571 | out: | |
1572 | dput(parent); | |
1da177e4 | 1573 | return 0; |
fab728e1 TM |
1574 | out_error: |
1575 | nfs_mark_for_revalidate(dir); | |
1576 | dput(parent); | |
1577 | return error; | |
1da177e4 | 1578 | } |
ddda8e0a | 1579 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1580 | |
1581 | /* | |
1582 | * Following a failed create operation, we drop the dentry rather | |
1583 | * than retain a negative dentry. This avoids a problem in the event | |
1584 | * that the operation succeeded on the server, but an error in the | |
1585 | * reply path made it appear to have failed. | |
1586 | */ | |
597d9289 | 1587 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1588 | umode_t mode, bool excl) |
1da177e4 LT |
1589 | { |
1590 | struct iattr attr; | |
ebfc3b49 | 1591 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1592 | int error; |
1da177e4 | 1593 | |
1e7cb3dc CL |
1594 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
1595 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1596 | |
1597 | attr.ia_mode = mode; | |
1598 | attr.ia_valid = ATTR_MODE; | |
1599 | ||
8867fe58 | 1600 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
1da177e4 LT |
1601 | if (error != 0) |
1602 | goto out_err; | |
1da177e4 LT |
1603 | return 0; |
1604 | out_err: | |
1da177e4 LT |
1605 | d_drop(dentry); |
1606 | return error; | |
1607 | } | |
ddda8e0a | 1608 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1609 | |
1610 | /* | |
1611 | * See comments for nfs_proc_create regarding failed operations. | |
1612 | */ | |
597d9289 | 1613 | int |
1a67aafb | 1614 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1615 | { |
1616 | struct iattr attr; | |
1617 | int status; | |
1618 | ||
1e7cb3dc CL |
1619 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
1620 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1621 | |
1622 | if (!new_valid_dev(rdev)) | |
1623 | return -EINVAL; | |
1624 | ||
1625 | attr.ia_mode = mode; | |
1626 | attr.ia_valid = ATTR_MODE; | |
1627 | ||
1da177e4 | 1628 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1da177e4 LT |
1629 | if (status != 0) |
1630 | goto out_err; | |
1da177e4 LT |
1631 | return 0; |
1632 | out_err: | |
1da177e4 LT |
1633 | d_drop(dentry); |
1634 | return status; | |
1635 | } | |
ddda8e0a | 1636 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1637 | |
1638 | /* | |
1639 | * See comments for nfs_proc_create regarding failed operations. | |
1640 | */ | |
597d9289 | 1641 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1642 | { |
1643 | struct iattr attr; | |
1644 | int error; | |
1645 | ||
1e7cb3dc CL |
1646 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
1647 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 LT |
1648 | |
1649 | attr.ia_valid = ATTR_MODE; | |
1650 | attr.ia_mode = mode | S_IFDIR; | |
1651 | ||
1da177e4 | 1652 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1da177e4 LT |
1653 | if (error != 0) |
1654 | goto out_err; | |
1da177e4 LT |
1655 | return 0; |
1656 | out_err: | |
1657 | d_drop(dentry); | |
1da177e4 LT |
1658 | return error; |
1659 | } | |
ddda8e0a | 1660 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1661 | |
d45b9d8b TM |
1662 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1663 | { | |
1664 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1665 | d_delete(dentry); | |
1666 | } | |
1667 | ||
597d9289 | 1668 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1669 | { |
1670 | int error; | |
1671 | ||
1e7cb3dc CL |
1672 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
1673 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); | |
1da177e4 | 1674 | |
1da177e4 LT |
1675 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1676 | /* Ensure the VFS deletes this inode */ | |
1677 | if (error == 0 && dentry->d_inode != NULL) | |
ce71ec36 | 1678 | clear_nlink(dentry->d_inode); |
d45b9d8b TM |
1679 | else if (error == -ENOENT) |
1680 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1681 | |
1682 | return error; | |
1683 | } | |
ddda8e0a | 1684 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1685 | |
1da177e4 LT |
1686 | /* |
1687 | * Remove a file after making sure there are no pending writes, | |
1688 | * and after checking that the file has only one user. | |
1689 | * | |
1690 | * We invalidate the attribute cache and free the inode prior to the operation | |
1691 | * to avoid possible races if the server reuses the inode. | |
1692 | */ | |
1693 | static int nfs_safe_remove(struct dentry *dentry) | |
1694 | { | |
1695 | struct inode *dir = dentry->d_parent->d_inode; | |
1696 | struct inode *inode = dentry->d_inode; | |
1697 | int error = -EBUSY; | |
1698 | ||
1699 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", | |
1700 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1701 | ||
1702 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1703 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1704 | error = 0; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1da177e4 | 1708 | if (inode != NULL) { |
57ec14c5 | 1709 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1710 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1711 | if (error == 0) |
1b83d707 | 1712 | nfs_drop_nlink(inode); |
1da177e4 LT |
1713 | } else |
1714 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1715 | if (error == -ENOENT) |
1716 | nfs_dentry_handle_enoent(dentry); | |
1da177e4 LT |
1717 | out: |
1718 | return error; | |
1719 | } | |
1720 | ||
1721 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1722 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1723 | * | |
1724 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1725 | */ | |
597d9289 | 1726 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1727 | { |
1728 | int error; | |
1729 | int need_rehash = 0; | |
1730 | ||
1731 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, | |
1732 | dir->i_ino, dentry->d_name.name); | |
1733 | ||
1da177e4 | 1734 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1735 | if (d_count(dentry) > 1) { |
1da177e4 | 1736 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1737 | /* Start asynchronous writeout of the inode */ |
1738 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1739 | error = nfs_sillyrename(dir, dentry); |
1da177e4 LT |
1740 | return error; |
1741 | } | |
1742 | if (!d_unhashed(dentry)) { | |
1743 | __d_drop(dentry); | |
1744 | need_rehash = 1; | |
1745 | } | |
1746 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1747 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1748 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1749 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1750 | } else if (need_rehash) | |
1751 | d_rehash(dentry); | |
1da177e4 LT |
1752 | return error; |
1753 | } | |
ddda8e0a | 1754 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1755 | |
873101b3 CL |
1756 | /* |
1757 | * To create a symbolic link, most file systems instantiate a new inode, | |
1758 | * add a page to it containing the path, then write it out to the disk | |
1759 | * using prepare_write/commit_write. | |
1760 | * | |
1761 | * Unfortunately the NFS client can't create the in-core inode first | |
1762 | * because it needs a file handle to create an in-core inode (see | |
1763 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1764 | * symlink request has completed on the server. | |
1765 | * | |
1766 | * So instead we allocate a raw page, copy the symname into it, then do | |
1767 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1768 | * now have a new file handle and can instantiate an in-core NFS inode | |
1769 | * and move the raw page into its mapping. | |
1770 | */ | |
597d9289 | 1771 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1772 | { |
873101b3 CL |
1773 | struct page *page; |
1774 | char *kaddr; | |
1da177e4 | 1775 | struct iattr attr; |
873101b3 | 1776 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1777 | int error; |
1778 | ||
1779 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, | |
1780 | dir->i_ino, dentry->d_name.name, symname); | |
1781 | ||
873101b3 CL |
1782 | if (pathlen > PAGE_SIZE) |
1783 | return -ENAMETOOLONG; | |
1da177e4 | 1784 | |
873101b3 CL |
1785 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1786 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1787 | |
83d93f22 | 1788 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1789 | if (!page) |
873101b3 | 1790 | return -ENOMEM; |
873101b3 | 1791 | |
2b86ce2d | 1792 | kaddr = kmap_atomic(page); |
873101b3 CL |
1793 | memcpy(kaddr, symname, pathlen); |
1794 | if (pathlen < PAGE_SIZE) | |
1795 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1796 | kunmap_atomic(kaddr); |
873101b3 | 1797 | |
94a6d753 | 1798 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
873101b3 CL |
1799 | if (error != 0) { |
1800 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", | |
1801 | dir->i_sb->s_id, dir->i_ino, | |
1802 | dentry->d_name.name, symname, error); | |
1da177e4 | 1803 | d_drop(dentry); |
873101b3 | 1804 | __free_page(page); |
873101b3 CL |
1805 | return error; |
1806 | } | |
1807 | ||
1808 | /* | |
1809 | * No big deal if we can't add this page to the page cache here. | |
1810 | * READLINK will get the missing page from the server if needed. | |
1811 | */ | |
a0b8cab3 | 1812 | if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0, |
873101b3 | 1813 | GFP_KERNEL)) { |
873101b3 CL |
1814 | SetPageUptodate(page); |
1815 | unlock_page(page); | |
1816 | } else | |
1817 | __free_page(page); | |
1818 | ||
873101b3 | 1819 | return 0; |
1da177e4 | 1820 | } |
ddda8e0a | 1821 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1822 | |
597d9289 | 1823 | int |
1da177e4 LT |
1824 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1825 | { | |
1826 | struct inode *inode = old_dentry->d_inode; | |
1827 | int error; | |
1828 | ||
1829 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", | |
1830 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1831 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1832 | ||
57ec14c5 | 1833 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1834 | |
9697d234 | 1835 | d_drop(dentry); |
1da177e4 | 1836 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1837 | if (error == 0) { |
7de9c6ee | 1838 | ihold(inode); |
9697d234 | 1839 | d_add(dentry, inode); |
cf809556 | 1840 | } |
1da177e4 LT |
1841 | return error; |
1842 | } | |
ddda8e0a | 1843 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1844 | |
1845 | /* | |
1846 | * RENAME | |
1847 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1848 | * different file handle for the same inode after a rename (e.g. when | |
1849 | * moving to a different directory). A fail-safe method to do so would | |
1850 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1851 | * rename the old file using the sillyrename stuff. This way, the original | |
1852 | * file in old_dir will go away when the last process iput()s the inode. | |
1853 | * | |
1854 | * FIXED. | |
1855 | * | |
1856 | * It actually works quite well. One needs to have the possibility for | |
1857 | * at least one ".nfs..." file in each directory the file ever gets | |
1858 | * moved or linked to which happens automagically with the new | |
1859 | * implementation that only depends on the dcache stuff instead of | |
1860 | * using the inode layer | |
1861 | * | |
1862 | * Unfortunately, things are a little more complicated than indicated | |
1863 | * above. For a cross-directory move, we want to make sure we can get | |
1864 | * rid of the old inode after the operation. This means there must be | |
1865 | * no pending writes (if it's a file), and the use count must be 1. | |
1866 | * If these conditions are met, we can drop the dentries before doing | |
1867 | * the rename. | |
1868 | */ | |
597d9289 | 1869 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1870 | struct inode *new_dir, struct dentry *new_dentry) |
1871 | { | |
1872 | struct inode *old_inode = old_dentry->d_inode; | |
1873 | struct inode *new_inode = new_dentry->d_inode; | |
1874 | struct dentry *dentry = NULL, *rehash = NULL; | |
1875 | int error = -EBUSY; | |
1876 | ||
1da177e4 LT |
1877 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
1878 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, | |
1879 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, | |
84d08fa8 | 1880 | d_count(new_dentry)); |
1da177e4 LT |
1881 | |
1882 | /* | |
28f79a1a MS |
1883 | * For non-directories, check whether the target is busy and if so, |
1884 | * make a copy of the dentry and then do a silly-rename. If the | |
1885 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1886 | * the new target. | |
1da177e4 | 1887 | */ |
27226104 MS |
1888 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1889 | /* | |
1890 | * To prevent any new references to the target during the | |
1891 | * rename, we unhash the dentry in advance. | |
1892 | */ | |
1893 | if (!d_unhashed(new_dentry)) { | |
1894 | d_drop(new_dentry); | |
1895 | rehash = new_dentry; | |
1896 | } | |
1da177e4 | 1897 | |
84d08fa8 | 1898 | if (d_count(new_dentry) > 2) { |
27226104 MS |
1899 | int err; |
1900 | ||
1901 | /* copy the target dentry's name */ | |
1902 | dentry = d_alloc(new_dentry->d_parent, | |
1903 | &new_dentry->d_name); | |
1904 | if (!dentry) | |
1905 | goto out; | |
1906 | ||
1907 | /* silly-rename the existing target ... */ | |
1908 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1909 | if (err) |
27226104 | 1910 | goto out; |
24e93025 MS |
1911 | |
1912 | new_dentry = dentry; | |
56335936 | 1913 | rehash = NULL; |
24e93025 | 1914 | new_inode = NULL; |
27226104 | 1915 | } |
b1e4adf4 | 1916 | } |
1da177e4 | 1917 | |
57ec14c5 | 1918 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1919 | if (new_inode != NULL) |
57ec14c5 | 1920 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1921 | |
1da177e4 LT |
1922 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1923 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1924 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1925 | out: |
1926 | if (rehash) | |
1927 | d_rehash(rehash); | |
1928 | if (!error) { | |
b1e4adf4 TM |
1929 | if (new_inode != NULL) |
1930 | nfs_drop_nlink(new_inode); | |
349457cc | 1931 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1932 | nfs_set_verifier(new_dentry, |
1933 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1934 | } else if (error == -ENOENT) |
1935 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1936 | |
1937 | /* new dentry created? */ | |
1938 | if (dentry) | |
1939 | dput(dentry); | |
1da177e4 LT |
1940 | return error; |
1941 | } | |
ddda8e0a | 1942 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 1943 | |
cfcea3e8 TM |
1944 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1945 | static LIST_HEAD(nfs_access_lru_list); | |
1946 | static atomic_long_t nfs_access_nr_entries; | |
1947 | ||
1c3c07e9 TM |
1948 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1949 | { | |
1950 | put_rpccred(entry->cred); | |
1951 | kfree(entry); | |
cfcea3e8 TM |
1952 | smp_mb__before_atomic_dec(); |
1953 | atomic_long_dec(&nfs_access_nr_entries); | |
1954 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1955 | } |
1956 | ||
1a81bb8a TM |
1957 | static void nfs_access_free_list(struct list_head *head) |
1958 | { | |
1959 | struct nfs_access_entry *cache; | |
1960 | ||
1961 | while (!list_empty(head)) { | |
1962 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1963 | list_del(&cache->lru); | |
1964 | nfs_access_free_entry(cache); | |
1965 | } | |
1966 | } | |
1967 | ||
1495f230 YH |
1968 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
1969 | struct shrink_control *sc) | |
979df72e TM |
1970 | { |
1971 | LIST_HEAD(head); | |
aa510da5 | 1972 | struct nfs_inode *nfsi, *next; |
979df72e | 1973 | struct nfs_access_entry *cache; |
1495f230 YH |
1974 | int nr_to_scan = sc->nr_to_scan; |
1975 | gfp_t gfp_mask = sc->gfp_mask; | |
979df72e | 1976 | |
61d5eb29 TM |
1977 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1978 | return (nr_to_scan == 0) ? 0 : -1; | |
9c7e7e23 | 1979 | |
a50f7951 | 1980 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 1981 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
1982 | struct inode *inode; |
1983 | ||
1984 | if (nr_to_scan-- == 0) | |
1985 | break; | |
9c7e7e23 | 1986 | inode = &nfsi->vfs_inode; |
979df72e TM |
1987 | spin_lock(&inode->i_lock); |
1988 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
1989 | goto remove_lru_entry; | |
1990 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
1991 | struct nfs_access_entry, lru); | |
1992 | list_move(&cache->lru, &head); | |
1993 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1994 | if (!list_empty(&nfsi->access_cache_entry_lru)) | |
1995 | list_move_tail(&nfsi->access_cache_inode_lru, | |
1996 | &nfs_access_lru_list); | |
1997 | else { | |
1998 | remove_lru_entry: | |
1999 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2000 | smp_mb__before_clear_bit(); |
979df72e | 2001 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2002 | smp_mb__after_clear_bit(); |
979df72e | 2003 | } |
59844a9b | 2004 | spin_unlock(&inode->i_lock); |
979df72e TM |
2005 | } |
2006 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2007 | nfs_access_free_list(&head); |
979df72e TM |
2008 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
2009 | } | |
2010 | ||
1a81bb8a | 2011 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2012 | { |
1c3c07e9 | 2013 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2014 | struct rb_node *n; |
1c3c07e9 TM |
2015 | struct nfs_access_entry *entry; |
2016 | ||
2017 | /* Unhook entries from the cache */ | |
2018 | while ((n = rb_first(root_node)) != NULL) { | |
2019 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2020 | rb_erase(n, root_node); | |
1a81bb8a | 2021 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2022 | } |
2023 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2024 | } |
2025 | ||
1c3c07e9 | 2026 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2027 | { |
1a81bb8a TM |
2028 | LIST_HEAD(head); |
2029 | ||
2030 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2031 | return; | |
cfcea3e8 | 2032 | /* Remove from global LRU init */ |
1a81bb8a TM |
2033 | spin_lock(&nfs_access_lru_lock); |
2034 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2035 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2036 | |
1c3c07e9 | 2037 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2038 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2039 | spin_unlock(&inode->i_lock); | |
2040 | spin_unlock(&nfs_access_lru_lock); | |
2041 | nfs_access_free_list(&head); | |
1c3c07e9 | 2042 | } |
1c606fb7 | 2043 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2044 | |
1c3c07e9 TM |
2045 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2046 | { | |
2047 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2048 | struct nfs_access_entry *entry; | |
2049 | ||
2050 | while (n != NULL) { | |
2051 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2052 | ||
2053 | if (cred < entry->cred) | |
2054 | n = n->rb_left; | |
2055 | else if (cred > entry->cred) | |
2056 | n = n->rb_right; | |
2057 | else | |
2058 | return entry; | |
1da177e4 | 2059 | } |
1c3c07e9 TM |
2060 | return NULL; |
2061 | } | |
2062 | ||
af22f94a | 2063 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2064 | { |
2065 | struct nfs_inode *nfsi = NFS_I(inode); | |
2066 | struct nfs_access_entry *cache; | |
2067 | int err = -ENOENT; | |
2068 | ||
dc59250c | 2069 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2070 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2071 | goto out_zap; | |
2072 | cache = nfs_access_search_rbtree(inode, cred); | |
2073 | if (cache == NULL) | |
2074 | goto out; | |
b4d2314b | 2075 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2076 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2077 | goto out_stale; |
2078 | res->jiffies = cache->jiffies; | |
2079 | res->cred = cache->cred; | |
2080 | res->mask = cache->mask; | |
cfcea3e8 | 2081 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2082 | err = 0; |
2083 | out: | |
2084 | spin_unlock(&inode->i_lock); | |
2085 | return err; | |
2086 | out_stale: | |
2087 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2088 | list_del(&cache->lru); |
1c3c07e9 TM |
2089 | spin_unlock(&inode->i_lock); |
2090 | nfs_access_free_entry(cache); | |
2091 | return -ENOENT; | |
2092 | out_zap: | |
1a81bb8a TM |
2093 | spin_unlock(&inode->i_lock); |
2094 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2095 | return -ENOENT; |
2096 | } | |
2097 | ||
2098 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2099 | { | |
cfcea3e8 TM |
2100 | struct nfs_inode *nfsi = NFS_I(inode); |
2101 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2102 | struct rb_node **p = &root_node->rb_node; |
2103 | struct rb_node *parent = NULL; | |
2104 | struct nfs_access_entry *entry; | |
2105 | ||
2106 | spin_lock(&inode->i_lock); | |
2107 | while (*p != NULL) { | |
2108 | parent = *p; | |
2109 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2110 | ||
2111 | if (set->cred < entry->cred) | |
2112 | p = &parent->rb_left; | |
2113 | else if (set->cred > entry->cred) | |
2114 | p = &parent->rb_right; | |
2115 | else | |
2116 | goto found; | |
2117 | } | |
2118 | rb_link_node(&set->rb_node, parent, p); | |
2119 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2120 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2121 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2122 | return; |
2123 | found: | |
2124 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2125 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2126 | list_del(&entry->lru); | |
1c3c07e9 TM |
2127 | spin_unlock(&inode->i_lock); |
2128 | nfs_access_free_entry(entry); | |
2129 | } | |
2130 | ||
6168f62c | 2131 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2132 | { |
2133 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2134 | if (cache == NULL) | |
2135 | return; | |
2136 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2137 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2138 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2139 | cache->mask = set->mask; |
1c3c07e9 TM |
2140 | |
2141 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2142 | |
2143 | /* Update accounting */ | |
2144 | smp_mb__before_atomic_inc(); | |
2145 | atomic_long_inc(&nfs_access_nr_entries); | |
2146 | smp_mb__after_atomic_inc(); | |
2147 | ||
2148 | /* Add inode to global LRU list */ | |
1a81bb8a | 2149 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2150 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2151 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2152 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2153 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2154 | spin_unlock(&nfs_access_lru_lock); |
2155 | } | |
1da177e4 | 2156 | } |
6168f62c WAA |
2157 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2158 | ||
2159 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2160 | { | |
2161 | entry->mask = 0; | |
2162 | if (access_result & NFS4_ACCESS_READ) | |
2163 | entry->mask |= MAY_READ; | |
2164 | if (access_result & | |
2165 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2166 | entry->mask |= MAY_WRITE; | |
2167 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2168 | entry->mask |= MAY_EXEC; | |
2169 | } | |
2170 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2171 | |
2172 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2173 | { | |
2174 | struct nfs_access_entry cache; | |
2175 | int status; | |
2176 | ||
2177 | status = nfs_access_get_cached(inode, cred, &cache); | |
2178 | if (status == 0) | |
2179 | goto out; | |
2180 | ||
2181 | /* Be clever: ask server to check for all possible rights */ | |
2182 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2183 | cache.cred = cred; | |
2184 | cache.jiffies = jiffies; | |
2185 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2186 | if (status != 0) { |
2187 | if (status == -ESTALE) { | |
2188 | nfs_zap_caches(inode); | |
2189 | if (!S_ISDIR(inode->i_mode)) | |
2190 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2191 | } | |
1da177e4 | 2192 | return status; |
a71ee337 | 2193 | } |
1da177e4 LT |
2194 | nfs_access_add_cache(inode, &cache); |
2195 | out: | |
e6305c43 | 2196 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2197 | return 0; |
2198 | return -EACCES; | |
2199 | } | |
2200 | ||
af22f94a TM |
2201 | static int nfs_open_permission_mask(int openflags) |
2202 | { | |
2203 | int mask = 0; | |
2204 | ||
f8d9a897 WAA |
2205 | if (openflags & __FMODE_EXEC) { |
2206 | /* ONLY check exec rights */ | |
2207 | mask = MAY_EXEC; | |
2208 | } else { | |
2209 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2210 | mask |= MAY_READ; | |
2211 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2212 | mask |= MAY_WRITE; | |
2213 | } | |
2214 | ||
af22f94a TM |
2215 | return mask; |
2216 | } | |
2217 | ||
2218 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2219 | { | |
2220 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2221 | } | |
89d77c8f | 2222 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2223 | |
10556cb2 | 2224 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2225 | { |
2226 | struct rpc_cred *cred; | |
2227 | int res = 0; | |
2228 | ||
10556cb2 | 2229 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2230 | return -ECHILD; |
2231 | ||
91d5b470 CL |
2232 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2233 | ||
e6305c43 | 2234 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2235 | goto out; |
2236 | /* Is this sys_access() ? */ | |
9cfcac81 | 2237 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2238 | goto force_lookup; |
2239 | ||
2240 | switch (inode->i_mode & S_IFMT) { | |
2241 | case S_IFLNK: | |
2242 | goto out; | |
2243 | case S_IFREG: | |
2244 | /* NFSv4 has atomic_open... */ | |
2245 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) | |
7ee2cb7f FF |
2246 | && (mask & MAY_OPEN) |
2247 | && !(mask & MAY_EXEC)) | |
1da177e4 LT |
2248 | goto out; |
2249 | break; | |
2250 | case S_IFDIR: | |
2251 | /* | |
2252 | * Optimize away all write operations, since the server | |
2253 | * will check permissions when we perform the op. | |
2254 | */ | |
2255 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2256 | goto out; | |
2257 | } | |
2258 | ||
2259 | force_lookup: | |
1da177e4 LT |
2260 | if (!NFS_PROTO(inode)->access) |
2261 | goto out_notsup; | |
2262 | ||
98a8e323 | 2263 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2264 | if (!IS_ERR(cred)) { |
2265 | res = nfs_do_access(inode, cred, mask); | |
2266 | put_rpccred(cred); | |
2267 | } else | |
2268 | res = PTR_ERR(cred); | |
1da177e4 | 2269 | out: |
f696a365 MS |
2270 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2271 | res = -EACCES; | |
2272 | ||
1e7cb3dc CL |
2273 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
2274 | inode->i_sb->s_id, inode->i_ino, mask, res); | |
1da177e4 LT |
2275 | return res; |
2276 | out_notsup: | |
2277 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2278 | if (res == 0) | |
2830ba7f | 2279 | res = generic_permission(inode, mask); |
1e7cb3dc | 2280 | goto out; |
1da177e4 | 2281 | } |
ddda8e0a | 2282 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2283 | |
2284 | /* | |
2285 | * Local variables: | |
2286 | * version-control: t | |
2287 | * kept-new-versions: 5 | |
2288 | * End: | |
2289 | */ |