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 | |
f4ce1299 TM |
46 | #include "nfstrace.h" |
47 | ||
1da177e4 LT |
48 | /* #define NFS_DEBUG_VERBOSE 1 */ |
49 | ||
50 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 51 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 52 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 53 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 54 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 55 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 56 | |
4b6f5d20 | 57 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 58 | .llseek = nfs_llseek_dir, |
1da177e4 | 59 | .read = generic_read_dir, |
23db8620 | 60 | .iterate = nfs_readdir, |
1da177e4 | 61 | .open = nfs_opendir, |
480c2006 | 62 | .release = nfs_closedir, |
1da177e4 LT |
63 | .fsync = nfs_fsync_dir, |
64 | }; | |
65 | ||
11de3b11 TM |
66 | const struct address_space_operations nfs_dir_aops = { |
67 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
68 | }; |
69 | ||
0c030806 | 70 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 BS |
71 | { |
72 | struct nfs_open_dir_context *ctx; | |
73 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
74 | if (ctx != NULL) { | |
8ef2ce3e | 75 | ctx->duped = 0; |
0c030806 | 76 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
480c2006 | 77 | ctx->dir_cookie = 0; |
8ef2ce3e | 78 | ctx->dup_cookie = 0; |
480c2006 | 79 | ctx->cred = get_rpccred(cred); |
0c030806 TM |
80 | return ctx; |
81 | } | |
82 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
83 | } |
84 | ||
85 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) | |
86 | { | |
87 | put_rpccred(ctx->cred); | |
88 | kfree(ctx); | |
89 | } | |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Open file | |
93 | */ | |
94 | static int | |
95 | nfs_opendir(struct inode *inode, struct file *filp) | |
96 | { | |
480c2006 BS |
97 | int res = 0; |
98 | struct nfs_open_dir_context *ctx; | |
99 | struct rpc_cred *cred; | |
1da177e4 | 100 | |
6de1472f | 101 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
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 | 290 | if (ctx->attr_gencount != nfsi->attr_gencount |
d529ef83 JL |
291 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) |
292 | || test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) { | |
0c030806 TM |
293 | ctx->duped = 0; |
294 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 295 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
296 | if (ctx->duped > 0 |
297 | && ctx->dup_cookie == *desc->dir_cookie) { | |
298 | if (printk_ratelimit()) { | |
6de1472f | 299 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 300 | "Please contact your server vendor. " |
374e4e3e | 301 | "The file: %s has duplicate cookie %llu\n", |
6de1472f | 302 | desc->file, |
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 | |
6de1472f AV |
823 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
824 | file, (long long)ctx->pos); | |
91d5b470 CL |
825 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
826 | ||
1da177e4 | 827 | /* |
23db8620 | 828 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 829 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
830 | * to either find the entry with the appropriate number or |
831 | * revalidate the cookie. | |
1da177e4 LT |
832 | */ |
833 | memset(desc, 0, sizeof(*desc)); | |
834 | ||
23db8620 AV |
835 | desc->file = file; |
836 | desc->ctx = ctx; | |
480c2006 | 837 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 838 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 839 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 840 | |
565277f6 | 841 | nfs_block_sillyrename(dentry); |
07b5ce8e SM |
842 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) |
843 | res = nfs_revalidate_mapping(inode, file->f_mapping); | |
fccca7fc TM |
844 | if (res < 0) |
845 | goto out; | |
846 | ||
47c716cb | 847 | do { |
1da177e4 | 848 | res = readdir_search_pagecache(desc); |
00a92642 | 849 | |
1da177e4 | 850 | if (res == -EBADCOOKIE) { |
ece0b423 | 851 | res = 0; |
1da177e4 | 852 | /* This means either end of directory */ |
d1bacf9e | 853 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 854 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 855 | res = uncached_readdir(desc); |
ece0b423 | 856 | if (res == 0) |
1da177e4 LT |
857 | continue; |
858 | } | |
1da177e4 LT |
859 | break; |
860 | } | |
861 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 862 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 863 | nfs_zap_caches(inode); |
baf57a09 | 864 | desc->page_index = 0; |
1da177e4 | 865 | desc->plus = 0; |
d1bacf9e | 866 | desc->eof = 0; |
1da177e4 LT |
867 | continue; |
868 | } | |
869 | if (res < 0) | |
870 | break; | |
871 | ||
23db8620 | 872 | res = nfs_do_filldir(desc); |
ece0b423 | 873 | if (res < 0) |
1da177e4 | 874 | break; |
47c716cb | 875 | } while (!desc->eof); |
fccca7fc | 876 | out: |
565277f6 | 877 | nfs_unblock_sillyrename(dentry); |
1e7cb3dc CL |
878 | if (res > 0) |
879 | res = 0; | |
6de1472f | 880 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 881 | return res; |
1da177e4 LT |
882 | } |
883 | ||
965c8e59 | 884 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 885 | { |
6de1472f | 886 | struct inode *inode = file_inode(filp); |
480c2006 | 887 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 888 | |
6de1472f AV |
889 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
890 | filp, offset, whence); | |
b84e06c5 CL |
891 | |
892 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 893 | switch (whence) { |
f0dd2136 TM |
894 | case 1: |
895 | offset += filp->f_pos; | |
896 | case 0: | |
897 | if (offset >= 0) | |
898 | break; | |
899 | default: | |
900 | offset = -EINVAL; | |
901 | goto out; | |
902 | } | |
903 | if (offset != filp->f_pos) { | |
904 | filp->f_pos = offset; | |
480c2006 | 905 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 906 | dir_ctx->duped = 0; |
f0dd2136 TM |
907 | } |
908 | out: | |
b84e06c5 | 909 | mutex_unlock(&inode->i_mutex); |
f0dd2136 TM |
910 | return offset; |
911 | } | |
912 | ||
1da177e4 LT |
913 | /* |
914 | * All directory operations under NFS are synchronous, so fsync() | |
915 | * is a dummy operation. | |
916 | */ | |
02c24a82 JB |
917 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
918 | int datasync) | |
1da177e4 | 919 | { |
6de1472f | 920 | struct inode *inode = file_inode(filp); |
7ea80859 | 921 | |
6de1472f | 922 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 923 | |
02c24a82 | 924 | mutex_lock(&inode->i_mutex); |
6de1472f | 925 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
02c24a82 | 926 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
927 | return 0; |
928 | } | |
929 | ||
bfc69a45 TM |
930 | /** |
931 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
932 | * @dir - pointer to directory inode | |
933 | * | |
934 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
935 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
936 | * on the server that might have invalidated our dcache. | |
937 | * | |
938 | * The caller should be holding dir->i_lock | |
939 | */ | |
940 | void nfs_force_lookup_revalidate(struct inode *dir) | |
941 | { | |
011935a0 | 942 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 943 | } |
89d77c8f | 944 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 945 | |
1da177e4 LT |
946 | /* |
947 | * A check for whether or not the parent directory has changed. | |
948 | * In the case it has, we assume that the dentries are untrustworthy | |
949 | * and may need to be looked up again. | |
950 | */ | |
c79ba787 | 951 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
952 | { |
953 | if (IS_ROOT(dentry)) | |
954 | return 1; | |
4eec952e TM |
955 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
956 | return 0; | |
f2c77f4e TM |
957 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
958 | return 0; | |
959 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
960 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
961 | return 0; | |
962 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
963 | return 0; | |
964 | return 1; | |
1da177e4 LT |
965 | } |
966 | ||
a12802ca TM |
967 | /* |
968 | * Use intent information to check whether or not we're going to do | |
969 | * an O_EXCL create using this path component. | |
970 | */ | |
fa3c56bb | 971 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
972 | { |
973 | if (NFS_PROTO(dir)->version == 2) | |
974 | return 0; | |
fa3c56bb | 975 | return flags & LOOKUP_EXCL; |
a12802ca TM |
976 | } |
977 | ||
1d6757fb TM |
978 | /* |
979 | * Inode and filehandle revalidation for lookups. | |
980 | * | |
981 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
982 | * or if the intent information indicates that we're about to open this | |
983 | * particular file and the "nocto" mount flag is not set. | |
984 | * | |
985 | */ | |
65a0c149 | 986 | static |
fa3c56bb | 987 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
988 | { |
989 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 990 | int ret; |
1da177e4 | 991 | |
36d43a43 | 992 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 993 | return 0; |
facc3530 | 994 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 995 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
996 | goto out_force; |
997 | /* This is an open(2) */ | |
fa3c56bb AV |
998 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
999 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1000 | goto out_force; |
65a0c149 TM |
1001 | out: |
1002 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1003 | out_force: |
65a0c149 TM |
1004 | ret = __nfs_revalidate_inode(server, inode); |
1005 | if (ret != 0) | |
1006 | return ret; | |
1007 | goto out; | |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | /* | |
1011 | * We judge how long we want to trust negative | |
1012 | * dentries by looking at the parent inode mtime. | |
1013 | * | |
1014 | * If parent mtime has changed, we revalidate, else we wait for a | |
1015 | * period corresponding to the parent's attribute cache timeout value. | |
1016 | */ | |
1017 | static inline | |
1018 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1019 | unsigned int flags) |
1da177e4 | 1020 | { |
1da177e4 | 1021 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1022 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1023 | return 0; |
4eec952e TM |
1024 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1025 | return 1; | |
1da177e4 LT |
1026 | return !nfs_check_verifier(dir, dentry); |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * This is called every time the dcache has a lookup hit, | |
1031 | * and we should check whether we can really trust that | |
1032 | * lookup. | |
1033 | * | |
1034 | * NOTE! The hit can be a negative hit too, don't assume | |
1035 | * we have an inode! | |
1036 | * | |
1037 | * If the parent directory is seen to have changed, we throw out the | |
1038 | * cached dentry and do a new lookup. | |
1039 | */ | |
0b728e19 | 1040 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1041 | { |
1042 | struct inode *dir; | |
1043 | struct inode *inode; | |
1044 | struct dentry *parent; | |
e1fb4d05 TM |
1045 | struct nfs_fh *fhandle = NULL; |
1046 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1047 | struct nfs4_label *label = NULL; |
1da177e4 | 1048 | int error; |
1da177e4 | 1049 | |
fa3c56bb | 1050 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1051 | return -ECHILD; |
1052 | ||
1da177e4 | 1053 | parent = dget_parent(dentry); |
1da177e4 | 1054 | dir = parent->d_inode; |
91d5b470 | 1055 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
1da177e4 LT |
1056 | inode = dentry->d_inode; |
1057 | ||
1058 | if (!inode) { | |
fa3c56bb | 1059 | if (nfs_neg_need_reval(dir, dentry, flags)) |
1da177e4 | 1060 | goto out_bad; |
d69ee9b8 | 1061 | goto out_valid_noent; |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1065 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1066 | __func__, dentry); | |
1da177e4 LT |
1067 | goto out_bad; |
1068 | } | |
1069 | ||
011e2a7f | 1070 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1071 | goto out_set_verifier; |
1072 | ||
1da177e4 | 1073 | /* Force a full look up iff the parent directory has changed */ |
fa3c56bb AV |
1074 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
1075 | if (nfs_lookup_verify_inode(inode, flags)) | |
1da177e4 LT |
1076 | goto out_zap_parent; |
1077 | goto out_valid; | |
1078 | } | |
1079 | ||
1080 | if (NFS_STALE(inode)) | |
1081 | goto out_bad; | |
1082 | ||
e1fb4d05 TM |
1083 | error = -ENOMEM; |
1084 | fhandle = nfs_alloc_fhandle(); | |
1085 | fattr = nfs_alloc_fattr(); | |
1086 | if (fhandle == NULL || fattr == NULL) | |
1087 | goto out_error; | |
1088 | ||
14c43f76 DQ |
1089 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1090 | if (IS_ERR(label)) | |
1091 | goto out_error; | |
1092 | ||
6e0d0be7 | 1093 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
1775fd3e | 1094 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
6e0d0be7 | 1095 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
1da177e4 LT |
1096 | if (error) |
1097 | goto out_bad; | |
e1fb4d05 | 1098 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1099 | goto out_bad; |
e1fb4d05 | 1100 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1101 | goto out_bad; |
1102 | ||
aa9c2669 DQ |
1103 | nfs_setsecurity(inode, fattr, label); |
1104 | ||
e1fb4d05 TM |
1105 | nfs_free_fattr(fattr); |
1106 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1107 | nfs4_label_free(label); |
1108 | ||
15860ab1 | 1109 | out_set_verifier: |
cf8ba45e | 1110 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1111 | out_valid: |
d69ee9b8 TM |
1112 | /* Success: notify readdir to use READDIRPLUS */ |
1113 | nfs_advise_use_readdirplus(dir); | |
1114 | out_valid_noent: | |
1da177e4 | 1115 | dput(parent); |
6de1472f AV |
1116 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", |
1117 | __func__, dentry); | |
1da177e4 LT |
1118 | return 1; |
1119 | out_zap_parent: | |
1120 | nfs_zap_caches(dir); | |
1121 | out_bad: | |
c44600c9 AV |
1122 | nfs_free_fattr(fattr); |
1123 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1124 | nfs4_label_free(label); |
a1643a92 | 1125 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1126 | if (inode && S_ISDIR(inode->i_mode)) { |
1127 | /* Purge readdir caches. */ | |
1128 | nfs_zap_caches(inode); | |
a3f432bf BF |
1129 | /* |
1130 | * We can't d_drop the root of a disconnected tree: | |
1131 | * its d_hash is on the s_anon list and d_drop() would hide | |
1132 | * it from shrink_dcache_for_unmount(), leading to busy | |
1133 | * inodes on unmount and further oopses. | |
1134 | */ | |
1135 | if (IS_ROOT(dentry)) | |
d9e80b7d | 1136 | goto out_valid; |
1da177e4 | 1137 | } |
13caa9fb MS |
1138 | /* If we have submounts, don't unhash ! */ |
1139 | if (check_submounts_and_drop(dentry) != 0) | |
1140 | goto out_valid; | |
1141 | ||
1da177e4 | 1142 | dput(parent); |
6de1472f AV |
1143 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", |
1144 | __func__, dentry); | |
1da177e4 | 1145 | return 0; |
e1fb4d05 TM |
1146 | out_error: |
1147 | nfs_free_fattr(fattr); | |
1148 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1149 | nfs4_label_free(label); |
e1fb4d05 | 1150 | dput(parent); |
6de1472f AV |
1151 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", |
1152 | __func__, dentry, error); | |
e1fb4d05 | 1153 | return error; |
1da177e4 LT |
1154 | } |
1155 | ||
ecf3d1f1 JL |
1156 | /* |
1157 | * A weaker form of d_revalidate for revalidating just the dentry->d_inode | |
1158 | * when we don't really care about the dentry name. This is called when a | |
1159 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1160 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1161 | * | |
1162 | * In this situation, we just want to verify that the inode itself is OK | |
1163 | * since the dentry might have changed on the server. | |
1164 | */ | |
1165 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1166 | { | |
1167 | int error; | |
1168 | struct inode *inode = dentry->d_inode; | |
1169 | ||
1170 | /* | |
1171 | * I believe we can only get a negative dentry here in the case of a | |
1172 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1173 | * eventually need to do something more here. | |
1174 | */ | |
1175 | if (!inode) { | |
6de1472f AV |
1176 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1177 | __func__, dentry); | |
ecf3d1f1 JL |
1178 | return 1; |
1179 | } | |
1180 | ||
1181 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1182 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1183 | __func__, dentry); | |
ecf3d1f1 JL |
1184 | return 0; |
1185 | } | |
1186 | ||
1187 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1188 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1189 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1190 | return !error; | |
1191 | } | |
1192 | ||
1da177e4 LT |
1193 | /* |
1194 | * This is called from dput() when d_count is going to 0. | |
1195 | */ | |
fe15ce44 | 1196 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1197 | { |
6de1472f AV |
1198 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1199 | dentry, dentry->d_flags); | |
1da177e4 | 1200 | |
77f11192 TM |
1201 | /* Unhash any dentry with a stale inode */ |
1202 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) | |
1203 | return 1; | |
1204 | ||
1da177e4 LT |
1205 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1206 | /* Unhash it, so that ->d_iput() would be called */ | |
1207 | return 1; | |
1208 | } | |
1209 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1210 | /* Unhash it, so that ancestors of killed async unlink | |
1211 | * files will be cleaned up during umount */ | |
1212 | return 1; | |
1213 | } | |
1214 | return 0; | |
1215 | ||
1216 | } | |
1217 | ||
1f018458 | 1218 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1219 | static void nfs_drop_nlink(struct inode *inode) |
1220 | { | |
1221 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1222 | /* drop the inode if we're reasonably sure this is the last link */ |
1223 | if (inode->i_nlink == 1) | |
1224 | clear_nlink(inode); | |
1225 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1226 | spin_unlock(&inode->i_lock); |
1227 | } | |
1228 | ||
1da177e4 LT |
1229 | /* |
1230 | * Called when the dentry loses inode. | |
1231 | * We use it to clean up silly-renamed files. | |
1232 | */ | |
1233 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1234 | { | |
83672d39 NB |
1235 | if (S_ISDIR(inode->i_mode)) |
1236 | /* drop any readdir cache as it could easily be old */ | |
1237 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1238 | ||
1da177e4 | 1239 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1240 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1241 | nfs_drop_nlink(inode); |
1da177e4 | 1242 | } |
1da177e4 LT |
1243 | iput(inode); |
1244 | } | |
1245 | ||
b1942c5f AV |
1246 | static void nfs_d_release(struct dentry *dentry) |
1247 | { | |
1248 | /* free cached devname value, if it survived that far */ | |
1249 | if (unlikely(dentry->d_fsdata)) { | |
1250 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1251 | WARN_ON(1); | |
1252 | else | |
1253 | kfree(dentry->d_fsdata); | |
1254 | } | |
1255 | } | |
1256 | ||
f786aa90 | 1257 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1258 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1259 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1260 | .d_delete = nfs_dentry_delete, |
1261 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1262 | .d_automount = nfs_d_automount, |
b1942c5f | 1263 | .d_release = nfs_d_release, |
1da177e4 | 1264 | }; |
ddda8e0a | 1265 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1266 | |
597d9289 | 1267 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1268 | { |
1269 | struct dentry *res; | |
565277f6 | 1270 | struct dentry *parent; |
1da177e4 | 1271 | struct inode *inode = NULL; |
e1fb4d05 TM |
1272 | struct nfs_fh *fhandle = NULL; |
1273 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1274 | struct nfs4_label *label = NULL; |
1da177e4 | 1275 | int error; |
1da177e4 | 1276 | |
6de1472f | 1277 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1278 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 LT |
1279 | |
1280 | res = ERR_PTR(-ENAMETOOLONG); | |
1281 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) | |
1282 | goto out; | |
1283 | ||
fd684071 TM |
1284 | /* |
1285 | * If we're doing an exclusive create, optimize away the lookup | |
1286 | * but don't hash the dentry. | |
1287 | */ | |
00cd8dd3 | 1288 | if (nfs_is_exclusive_create(dir, flags)) { |
fd684071 TM |
1289 | d_instantiate(dentry, NULL); |
1290 | res = NULL; | |
fc0f684c | 1291 | goto out; |
fd684071 | 1292 | } |
1da177e4 | 1293 | |
e1fb4d05 TM |
1294 | res = ERR_PTR(-ENOMEM); |
1295 | fhandle = nfs_alloc_fhandle(); | |
1296 | fattr = nfs_alloc_fattr(); | |
1297 | if (fhandle == NULL || fattr == NULL) | |
1298 | goto out; | |
1299 | ||
14c43f76 DQ |
1300 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1301 | if (IS_ERR(label)) | |
1302 | goto out; | |
1303 | ||
565277f6 TM |
1304 | parent = dentry->d_parent; |
1305 | /* Protect against concurrent sillydeletes */ | |
6e0d0be7 | 1306 | trace_nfs_lookup_enter(dir, dentry, flags); |
565277f6 | 1307 | nfs_block_sillyrename(parent); |
1775fd3e | 1308 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1309 | if (error == -ENOENT) |
1310 | goto no_entry; | |
1311 | if (error < 0) { | |
1312 | res = ERR_PTR(error); | |
565277f6 | 1313 | goto out_unblock_sillyrename; |
1da177e4 | 1314 | } |
1775fd3e | 1315 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1316 | res = ERR_CAST(inode); |
03f28e3a | 1317 | if (IS_ERR(res)) |
565277f6 | 1318 | goto out_unblock_sillyrename; |
54ceac45 | 1319 | |
d69ee9b8 TM |
1320 | /* Success: notify readdir to use READDIRPLUS */ |
1321 | nfs_advise_use_readdirplus(dir); | |
1322 | ||
1da177e4 | 1323 | no_entry: |
54ceac45 | 1324 | res = d_materialise_unique(dentry, inode); |
9eaef27b TM |
1325 | if (res != NULL) { |
1326 | if (IS_ERR(res)) | |
565277f6 | 1327 | goto out_unblock_sillyrename; |
1da177e4 | 1328 | dentry = res; |
9eaef27b | 1329 | } |
1da177e4 | 1330 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
565277f6 TM |
1331 | out_unblock_sillyrename: |
1332 | nfs_unblock_sillyrename(parent); | |
6e0d0be7 | 1333 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1334 | nfs4_label_free(label); |
1da177e4 | 1335 | out: |
e1fb4d05 TM |
1336 | nfs_free_fattr(fattr); |
1337 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1338 | return res; |
1339 | } | |
ddda8e0a | 1340 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1341 | |
89d77c8f | 1342 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1343 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1344 | |
f786aa90 | 1345 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1346 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1347 | .d_delete = nfs_dentry_delete, |
1348 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1349 | .d_automount = nfs_d_automount, |
b1942c5f | 1350 | .d_release = nfs_d_release, |
1da177e4 | 1351 | }; |
89d77c8f | 1352 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1353 | |
8a5e929d AV |
1354 | static fmode_t flags_to_mode(int flags) |
1355 | { | |
1356 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1357 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1358 | res |= FMODE_READ; | |
1359 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1360 | res |= FMODE_WRITE; | |
1361 | return res; | |
1362 | } | |
1363 | ||
51141598 | 1364 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1365 | { |
5ede7b1c | 1366 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1367 | } |
1368 | ||
1369 | static int do_open(struct inode *inode, struct file *filp) | |
1370 | { | |
f1fe29b4 | 1371 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1372 | return 0; |
1373 | } | |
1374 | ||
d9585277 AV |
1375 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1376 | struct dentry *dentry, | |
30d90494 | 1377 | struct file *file, unsigned open_flags, |
d9585277 | 1378 | int *opened) |
cd9a1c0e | 1379 | { |
0dd2b474 MS |
1380 | int err; |
1381 | ||
01c919ab MS |
1382 | if ((open_flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
1383 | *opened |= FILE_CREATED; | |
1384 | ||
30d90494 AV |
1385 | err = finish_open(file, dentry, do_open, opened); |
1386 | if (err) | |
d9585277 | 1387 | goto out; |
30d90494 | 1388 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1389 | |
cd9a1c0e | 1390 | out: |
d9585277 | 1391 | return err; |
cd9a1c0e TM |
1392 | } |
1393 | ||
73a79706 BS |
1394 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1395 | struct file *file, unsigned open_flags, | |
1396 | umode_t mode, int *opened) | |
1da177e4 | 1397 | { |
cd9a1c0e | 1398 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1399 | struct dentry *res; |
1400 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1401 | struct inode *inode; |
1472b83e | 1402 | unsigned int lookup_flags = 0; |
898f635c | 1403 | int err; |
1da177e4 | 1404 | |
0dd2b474 MS |
1405 | /* Expect a negative dentry */ |
1406 | BUG_ON(dentry->d_inode); | |
1407 | ||
1e8968c5 | 1408 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1409 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1410 | |
9597c13b JL |
1411 | err = nfs_check_flags(open_flags); |
1412 | if (err) | |
1413 | return err; | |
1414 | ||
0dd2b474 MS |
1415 | /* NFS only supports OPEN on regular files */ |
1416 | if ((open_flags & O_DIRECTORY)) { | |
0dd2b474 MS |
1417 | if (!d_unhashed(dentry)) { |
1418 | /* | |
1419 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1420 | * revalidated and is fine, no need to perform lookup | |
1421 | * again | |
1422 | */ | |
d9585277 | 1423 | return -ENOENT; |
0dd2b474 | 1424 | } |
1472b83e | 1425 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
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 | |
6e0d0be7 | 1446 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
f46e0bd3 | 1447 | nfs_block_sillyrename(dentry->d_parent); |
5bc2afc2 | 1448 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened); |
275bb307 | 1449 | nfs_unblock_sillyrename(dentry->d_parent); |
f46e0bd3 | 1450 | if (IS_ERR(inode)) { |
0dd2b474 | 1451 | err = PTR_ERR(inode); |
6e0d0be7 | 1452 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1453 | put_nfs_open_context(ctx); |
0dd2b474 MS |
1454 | switch (err) { |
1455 | case -ENOENT: | |
275bb307 | 1456 | d_drop(dentry); |
0dd2b474 MS |
1457 | d_add(dentry, NULL); |
1458 | break; | |
1459 | case -EISDIR: | |
1460 | case -ENOTDIR: | |
1461 | goto no_open; | |
1462 | case -ELOOP: | |
1463 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1464 | goto no_open; |
0dd2b474 | 1465 | break; |
1da177e4 | 1466 | /* case -EINVAL: */ |
0dd2b474 MS |
1467 | default: |
1468 | break; | |
1da177e4 | 1469 | } |
d9585277 | 1470 | goto out; |
cd9a1c0e | 1471 | } |
0dd2b474 | 1472 | |
275bb307 | 1473 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
6e0d0be7 | 1474 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1475 | put_nfs_open_context(ctx); |
d9585277 AV |
1476 | out: |
1477 | return err; | |
0dd2b474 | 1478 | |
1da177e4 | 1479 | no_open: |
1472b83e | 1480 | res = nfs_lookup(dir, dentry, lookup_flags); |
0dd2b474 MS |
1481 | err = PTR_ERR(res); |
1482 | if (IS_ERR(res)) | |
d9585277 | 1483 | goto out; |
0dd2b474 | 1484 | |
e45198a6 | 1485 | return finish_no_open(file, res); |
1da177e4 | 1486 | } |
89d77c8f | 1487 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1488 | |
0b728e19 | 1489 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1490 | { |
1491 | struct dentry *parent = NULL; | |
657e94b6 | 1492 | struct inode *inode; |
1da177e4 | 1493 | struct inode *dir; |
50de348c | 1494 | int ret = 0; |
1da177e4 | 1495 | |
fa3c56bb | 1496 | if (flags & LOOKUP_RCU) |
657e94b6 NP |
1497 | return -ECHILD; |
1498 | ||
fa3c56bb | 1499 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1500 | goto no_open; |
1501 | if (d_mountpoint(dentry)) | |
5584c306 | 1502 | goto no_open; |
49f9a0fa TM |
1503 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1504 | goto no_open; | |
2b484297 | 1505 | |
eda72afb | 1506 | inode = dentry->d_inode; |
1da177e4 LT |
1507 | parent = dget_parent(dentry); |
1508 | dir = parent->d_inode; | |
2b484297 | 1509 | |
1da177e4 LT |
1510 | /* We can't create new files in nfs_open_revalidate(), so we |
1511 | * optimize away revalidation of negative dentries. | |
1512 | */ | |
216d5d06 | 1513 | if (inode == NULL) { |
fa3c56bb | 1514 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1515 | ret = 1; |
1da177e4 | 1516 | goto out; |
216d5d06 TM |
1517 | } |
1518 | ||
1da177e4 LT |
1519 | /* NFS only supports OPEN on regular files */ |
1520 | if (!S_ISREG(inode->i_mode)) | |
5584c306 | 1521 | goto no_open_dput; |
1da177e4 | 1522 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1523 | if (flags & LOOKUP_EXCL) |
5584c306 | 1524 | goto no_open_dput; |
1da177e4 | 1525 | |
0ef97dcf MS |
1526 | /* Let f_op->open() actually open (and revalidate) the file */ |
1527 | ret = 1; | |
536e43d1 | 1528 | |
1da177e4 LT |
1529 | out: |
1530 | dput(parent); | |
1da177e4 | 1531 | return ret; |
535918f1 | 1532 | |
5584c306 | 1533 | no_open_dput: |
1da177e4 | 1534 | dput(parent); |
5584c306 | 1535 | no_open: |
0b728e19 | 1536 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1537 | } |
1538 | ||
1da177e4 LT |
1539 | #endif /* CONFIG_NFSV4 */ |
1540 | ||
1da177e4 LT |
1541 | /* |
1542 | * Code common to create, mkdir, and mknod. | |
1543 | */ | |
1544 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1545 | struct nfs_fattr *fattr, |
1546 | struct nfs4_label *label) | |
1da177e4 | 1547 | { |
fab728e1 TM |
1548 | struct dentry *parent = dget_parent(dentry); |
1549 | struct inode *dir = parent->d_inode; | |
1da177e4 LT |
1550 | struct inode *inode; |
1551 | int error = -EACCES; | |
1552 | ||
fab728e1 TM |
1553 | d_drop(dentry); |
1554 | ||
1da177e4 LT |
1555 | /* We may have been initialized further down */ |
1556 | if (dentry->d_inode) | |
fab728e1 | 1557 | goto out; |
1da177e4 | 1558 | if (fhandle->size == 0) { |
1775fd3e | 1559 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1560 | if (error) |
fab728e1 | 1561 | goto out_error; |
1da177e4 | 1562 | } |
5724ab37 | 1563 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1564 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1565 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1566 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1567 | if (error < 0) |
fab728e1 | 1568 | goto out_error; |
1da177e4 | 1569 | } |
1775fd3e | 1570 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1571 | error = PTR_ERR(inode); |
1572 | if (IS_ERR(inode)) | |
fab728e1 TM |
1573 | goto out_error; |
1574 | d_add(dentry, inode); | |
1575 | out: | |
1576 | dput(parent); | |
1da177e4 | 1577 | return 0; |
fab728e1 TM |
1578 | out_error: |
1579 | nfs_mark_for_revalidate(dir); | |
1580 | dput(parent); | |
1581 | return error; | |
1da177e4 | 1582 | } |
ddda8e0a | 1583 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1584 | |
1585 | /* | |
1586 | * Following a failed create operation, we drop the dentry rather | |
1587 | * than retain a negative dentry. This avoids a problem in the event | |
1588 | * that the operation succeeded on the server, but an error in the | |
1589 | * reply path made it appear to have failed. | |
1590 | */ | |
597d9289 | 1591 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1592 | umode_t mode, bool excl) |
1da177e4 LT |
1593 | { |
1594 | struct iattr attr; | |
ebfc3b49 | 1595 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1596 | int error; |
1da177e4 | 1597 | |
1e8968c5 | 1598 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 1599 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1600 | |
1601 | attr.ia_mode = mode; | |
1602 | attr.ia_valid = ATTR_MODE; | |
1603 | ||
8b0ad3d4 | 1604 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1605 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1606 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1607 | if (error != 0) |
1608 | goto out_err; | |
1da177e4 LT |
1609 | return 0; |
1610 | out_err: | |
1da177e4 LT |
1611 | d_drop(dentry); |
1612 | return error; | |
1613 | } | |
ddda8e0a | 1614 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1615 | |
1616 | /* | |
1617 | * See comments for nfs_proc_create regarding failed operations. | |
1618 | */ | |
597d9289 | 1619 | int |
1a67aafb | 1620 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1621 | { |
1622 | struct iattr attr; | |
1623 | int status; | |
1624 | ||
1e8968c5 | 1625 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 1626 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1627 | |
1628 | if (!new_valid_dev(rdev)) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | attr.ia_mode = mode; | |
1632 | attr.ia_valid = ATTR_MODE; | |
1633 | ||
1ca42382 | 1634 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1635 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1636 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1637 | if (status != 0) |
1638 | goto out_err; | |
1da177e4 LT |
1639 | return 0; |
1640 | out_err: | |
1da177e4 LT |
1641 | d_drop(dentry); |
1642 | return status; | |
1643 | } | |
ddda8e0a | 1644 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1645 | |
1646 | /* | |
1647 | * See comments for nfs_proc_create regarding failed operations. | |
1648 | */ | |
597d9289 | 1649 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1650 | { |
1651 | struct iattr attr; | |
1652 | int error; | |
1653 | ||
1e8968c5 | 1654 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 1655 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1656 | |
1657 | attr.ia_valid = ATTR_MODE; | |
1658 | attr.ia_mode = mode | S_IFDIR; | |
1659 | ||
1ca42382 | 1660 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1661 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1662 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1663 | if (error != 0) |
1664 | goto out_err; | |
1da177e4 LT |
1665 | return 0; |
1666 | out_err: | |
1667 | d_drop(dentry); | |
1da177e4 LT |
1668 | return error; |
1669 | } | |
ddda8e0a | 1670 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1671 | |
d45b9d8b TM |
1672 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1673 | { | |
1674 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) | |
1675 | d_delete(dentry); | |
1676 | } | |
1677 | ||
597d9289 | 1678 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1679 | { |
1680 | int error; | |
1681 | ||
1e8968c5 | 1682 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 1683 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1684 | |
1ca42382 | 1685 | trace_nfs_rmdir_enter(dir, dentry); |
ba6c0592 TM |
1686 | if (dentry->d_inode) { |
1687 | nfs_wait_on_sillyrename(dentry); | |
1688 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1689 | /* Ensure the VFS deletes this inode */ | |
1690 | switch (error) { | |
1691 | case 0: | |
1692 | clear_nlink(dentry->d_inode); | |
1693 | break; | |
1694 | case -ENOENT: | |
1695 | nfs_dentry_handle_enoent(dentry); | |
1696 | } | |
1697 | } else | |
1698 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1699 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1700 | |
1701 | return error; | |
1702 | } | |
ddda8e0a | 1703 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1704 | |
1da177e4 LT |
1705 | /* |
1706 | * Remove a file after making sure there are no pending writes, | |
1707 | * and after checking that the file has only one user. | |
1708 | * | |
1709 | * We invalidate the attribute cache and free the inode prior to the operation | |
1710 | * to avoid possible races if the server reuses the inode. | |
1711 | */ | |
1712 | static int nfs_safe_remove(struct dentry *dentry) | |
1713 | { | |
1714 | struct inode *dir = dentry->d_parent->d_inode; | |
1715 | struct inode *inode = dentry->d_inode; | |
1716 | int error = -EBUSY; | |
1717 | ||
6de1472f | 1718 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
1719 | |
1720 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1721 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1722 | error = 0; | |
1723 | goto out; | |
1724 | } | |
1725 | ||
1ca42382 | 1726 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1727 | if (inode != NULL) { |
57ec14c5 | 1728 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1729 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1730 | if (error == 0) |
1b83d707 | 1731 | nfs_drop_nlink(inode); |
1da177e4 LT |
1732 | } else |
1733 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1734 | if (error == -ENOENT) |
1735 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1736 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1737 | out: |
1738 | return error; | |
1739 | } | |
1740 | ||
1741 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1742 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1743 | * | |
1744 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1745 | */ | |
597d9289 | 1746 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1747 | { |
1748 | int error; | |
1749 | int need_rehash = 0; | |
1750 | ||
1e8968c5 | 1751 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 1752 | dir->i_ino, dentry); |
1da177e4 | 1753 | |
1ca42382 | 1754 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1755 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1756 | if (d_count(dentry) > 1) { |
1da177e4 | 1757 | spin_unlock(&dentry->d_lock); |
ccfeb506 TM |
1758 | /* Start asynchronous writeout of the inode */ |
1759 | write_inode_now(dentry->d_inode, 0); | |
1da177e4 | 1760 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1761 | goto out; |
1da177e4 LT |
1762 | } |
1763 | if (!d_unhashed(dentry)) { | |
1764 | __d_drop(dentry); | |
1765 | need_rehash = 1; | |
1766 | } | |
1767 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1768 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1769 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1770 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1771 | } else if (need_rehash) | |
1772 | d_rehash(dentry); | |
1ca42382 TM |
1773 | out: |
1774 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1775 | return error; |
1776 | } | |
ddda8e0a | 1777 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1778 | |
873101b3 CL |
1779 | /* |
1780 | * To create a symbolic link, most file systems instantiate a new inode, | |
1781 | * add a page to it containing the path, then write it out to the disk | |
1782 | * using prepare_write/commit_write. | |
1783 | * | |
1784 | * Unfortunately the NFS client can't create the in-core inode first | |
1785 | * because it needs a file handle to create an in-core inode (see | |
1786 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1787 | * symlink request has completed on the server. | |
1788 | * | |
1789 | * So instead we allocate a raw page, copy the symname into it, then do | |
1790 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1791 | * now have a new file handle and can instantiate an in-core NFS inode | |
1792 | * and move the raw page into its mapping. | |
1793 | */ | |
597d9289 | 1794 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1795 | { |
873101b3 CL |
1796 | struct page *page; |
1797 | char *kaddr; | |
1da177e4 | 1798 | struct iattr attr; |
873101b3 | 1799 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1800 | int error; |
1801 | ||
1e8968c5 | 1802 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 1803 | dir->i_ino, dentry, symname); |
1da177e4 | 1804 | |
873101b3 CL |
1805 | if (pathlen > PAGE_SIZE) |
1806 | return -ENAMETOOLONG; | |
1da177e4 | 1807 | |
873101b3 CL |
1808 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1809 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1810 | |
83d93f22 | 1811 | page = alloc_page(GFP_HIGHUSER); |
76566991 | 1812 | if (!page) |
873101b3 | 1813 | return -ENOMEM; |
873101b3 | 1814 | |
2b86ce2d | 1815 | kaddr = kmap_atomic(page); |
873101b3 CL |
1816 | memcpy(kaddr, symname, pathlen); |
1817 | if (pathlen < PAGE_SIZE) | |
1818 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
2b86ce2d | 1819 | kunmap_atomic(kaddr); |
873101b3 | 1820 | |
1ca42382 | 1821 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 1822 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 1823 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 1824 | if (error != 0) { |
1e8968c5 | 1825 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 1826 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 1827 | dentry, symname, error); |
1da177e4 | 1828 | d_drop(dentry); |
873101b3 | 1829 | __free_page(page); |
873101b3 CL |
1830 | return error; |
1831 | } | |
1832 | ||
1833 | /* | |
1834 | * No big deal if we can't add this page to the page cache here. | |
1835 | * READLINK will get the missing page from the server if needed. | |
1836 | */ | |
a0b8cab3 | 1837 | if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0, |
873101b3 | 1838 | GFP_KERNEL)) { |
873101b3 CL |
1839 | SetPageUptodate(page); |
1840 | unlock_page(page); | |
1841 | } else | |
1842 | __free_page(page); | |
1843 | ||
873101b3 | 1844 | return 0; |
1da177e4 | 1845 | } |
ddda8e0a | 1846 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1847 | |
597d9289 | 1848 | int |
1da177e4 LT |
1849 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1850 | { | |
1851 | struct inode *inode = old_dentry->d_inode; | |
1852 | int error; | |
1853 | ||
6de1472f AV |
1854 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
1855 | old_dentry, dentry); | |
1da177e4 | 1856 | |
1fd1085b | 1857 | trace_nfs_link_enter(inode, dir, dentry); |
57ec14c5 | 1858 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1859 | |
9697d234 | 1860 | d_drop(dentry); |
1da177e4 | 1861 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1862 | if (error == 0) { |
7de9c6ee | 1863 | ihold(inode); |
9697d234 | 1864 | d_add(dentry, inode); |
cf809556 | 1865 | } |
1fd1085b | 1866 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
1867 | return error; |
1868 | } | |
ddda8e0a | 1869 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1870 | |
1871 | /* | |
1872 | * RENAME | |
1873 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1874 | * different file handle for the same inode after a rename (e.g. when | |
1875 | * moving to a different directory). A fail-safe method to do so would | |
1876 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1877 | * rename the old file using the sillyrename stuff. This way, the original | |
1878 | * file in old_dir will go away when the last process iput()s the inode. | |
1879 | * | |
1880 | * FIXED. | |
1881 | * | |
1882 | * It actually works quite well. One needs to have the possibility for | |
1883 | * at least one ".nfs..." file in each directory the file ever gets | |
1884 | * moved or linked to which happens automagically with the new | |
1885 | * implementation that only depends on the dcache stuff instead of | |
1886 | * using the inode layer | |
1887 | * | |
1888 | * Unfortunately, things are a little more complicated than indicated | |
1889 | * above. For a cross-directory move, we want to make sure we can get | |
1890 | * rid of the old inode after the operation. This means there must be | |
1891 | * no pending writes (if it's a file), and the use count must be 1. | |
1892 | * If these conditions are met, we can drop the dentries before doing | |
1893 | * the rename. | |
1894 | */ | |
597d9289 | 1895 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
1896 | struct inode *new_dir, struct dentry *new_dentry) |
1897 | { | |
1898 | struct inode *old_inode = old_dentry->d_inode; | |
1899 | struct inode *new_inode = new_dentry->d_inode; | |
1900 | struct dentry *dentry = NULL, *rehash = NULL; | |
1901 | int error = -EBUSY; | |
1902 | ||
6de1472f AV |
1903 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
1904 | old_dentry, new_dentry, | |
84d08fa8 | 1905 | d_count(new_dentry)); |
1da177e4 | 1906 | |
70ded201 | 1907 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 1908 | /* |
28f79a1a MS |
1909 | * For non-directories, check whether the target is busy and if so, |
1910 | * make a copy of the dentry and then do a silly-rename. If the | |
1911 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
1912 | * the new target. | |
1da177e4 | 1913 | */ |
27226104 MS |
1914 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
1915 | /* | |
1916 | * To prevent any new references to the target during the | |
1917 | * rename, we unhash the dentry in advance. | |
1918 | */ | |
1919 | if (!d_unhashed(new_dentry)) { | |
1920 | d_drop(new_dentry); | |
1921 | rehash = new_dentry; | |
1922 | } | |
1da177e4 | 1923 | |
84d08fa8 | 1924 | if (d_count(new_dentry) > 2) { |
27226104 MS |
1925 | int err; |
1926 | ||
1927 | /* copy the target dentry's name */ | |
1928 | dentry = d_alloc(new_dentry->d_parent, | |
1929 | &new_dentry->d_name); | |
1930 | if (!dentry) | |
1931 | goto out; | |
1932 | ||
1933 | /* silly-rename the existing target ... */ | |
1934 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 1935 | if (err) |
27226104 | 1936 | goto out; |
24e93025 MS |
1937 | |
1938 | new_dentry = dentry; | |
56335936 | 1939 | rehash = NULL; |
24e93025 | 1940 | new_inode = NULL; |
27226104 | 1941 | } |
b1e4adf4 | 1942 | } |
1da177e4 | 1943 | |
57ec14c5 | 1944 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 1945 | if (new_inode != NULL) |
57ec14c5 | 1946 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 1947 | |
1da177e4 LT |
1948 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
1949 | new_dir, &new_dentry->d_name); | |
5ba7cc48 | 1950 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
1951 | out: |
1952 | if (rehash) | |
1953 | d_rehash(rehash); | |
70ded201 TM |
1954 | trace_nfs_rename_exit(old_dir, old_dentry, |
1955 | new_dir, new_dentry, error); | |
1da177e4 | 1956 | if (!error) { |
b1e4adf4 TM |
1957 | if (new_inode != NULL) |
1958 | nfs_drop_nlink(new_inode); | |
349457cc | 1959 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
1960 | nfs_set_verifier(new_dentry, |
1961 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
1962 | } else if (error == -ENOENT) |
1963 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
1964 | |
1965 | /* new dentry created? */ | |
1966 | if (dentry) | |
1967 | dput(dentry); | |
1da177e4 LT |
1968 | return error; |
1969 | } | |
ddda8e0a | 1970 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 1971 | |
cfcea3e8 TM |
1972 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
1973 | static LIST_HEAD(nfs_access_lru_list); | |
1974 | static atomic_long_t nfs_access_nr_entries; | |
1975 | ||
1c3c07e9 TM |
1976 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
1977 | { | |
1978 | put_rpccred(entry->cred); | |
1979 | kfree(entry); | |
cfcea3e8 TM |
1980 | smp_mb__before_atomic_dec(); |
1981 | atomic_long_dec(&nfs_access_nr_entries); | |
1982 | smp_mb__after_atomic_dec(); | |
1c3c07e9 TM |
1983 | } |
1984 | ||
1a81bb8a TM |
1985 | static void nfs_access_free_list(struct list_head *head) |
1986 | { | |
1987 | struct nfs_access_entry *cache; | |
1988 | ||
1989 | while (!list_empty(head)) { | |
1990 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
1991 | list_del(&cache->lru); | |
1992 | nfs_access_free_entry(cache); | |
1993 | } | |
1994 | } | |
1995 | ||
1ab6c499 DC |
1996 | unsigned long |
1997 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
979df72e TM |
1998 | { |
1999 | LIST_HEAD(head); | |
aa510da5 | 2000 | struct nfs_inode *nfsi, *next; |
979df72e | 2001 | struct nfs_access_entry *cache; |
1495f230 YH |
2002 | int nr_to_scan = sc->nr_to_scan; |
2003 | gfp_t gfp_mask = sc->gfp_mask; | |
1ab6c499 | 2004 | long freed = 0; |
979df72e | 2005 | |
61d5eb29 | 2006 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
1ab6c499 | 2007 | return SHRINK_STOP; |
9c7e7e23 | 2008 | |
a50f7951 | 2009 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2010 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2011 | struct inode *inode; |
2012 | ||
2013 | if (nr_to_scan-- == 0) | |
2014 | break; | |
9c7e7e23 | 2015 | inode = &nfsi->vfs_inode; |
979df72e TM |
2016 | spin_lock(&inode->i_lock); |
2017 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2018 | goto remove_lru_entry; | |
2019 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2020 | struct nfs_access_entry, lru); | |
2021 | list_move(&cache->lru, &head); | |
2022 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2023 | freed++; |
979df72e TM |
2024 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2025 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2026 | &nfs_access_lru_list); | |
2027 | else { | |
2028 | remove_lru_entry: | |
2029 | list_del_init(&nfsi->access_cache_inode_lru); | |
9c7e7e23 | 2030 | smp_mb__before_clear_bit(); |
979df72e | 2031 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
9c7e7e23 | 2032 | smp_mb__after_clear_bit(); |
979df72e | 2033 | } |
59844a9b | 2034 | spin_unlock(&inode->i_lock); |
979df72e TM |
2035 | } |
2036 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2037 | nfs_access_free_list(&head); |
1ab6c499 DC |
2038 | return freed; |
2039 | } | |
2040 | ||
2041 | unsigned long | |
2042 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2043 | { | |
55f841ce | 2044 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2045 | } |
2046 | ||
1a81bb8a | 2047 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2048 | { |
1c3c07e9 | 2049 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2050 | struct rb_node *n; |
1c3c07e9 TM |
2051 | struct nfs_access_entry *entry; |
2052 | ||
2053 | /* Unhook entries from the cache */ | |
2054 | while ((n = rb_first(root_node)) != NULL) { | |
2055 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2056 | rb_erase(n, root_node); | |
1a81bb8a | 2057 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2058 | } |
2059 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2060 | } |
2061 | ||
1c3c07e9 | 2062 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2063 | { |
1a81bb8a TM |
2064 | LIST_HEAD(head); |
2065 | ||
2066 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2067 | return; | |
cfcea3e8 | 2068 | /* Remove from global LRU init */ |
1a81bb8a TM |
2069 | spin_lock(&nfs_access_lru_lock); |
2070 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2071 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2072 | |
1c3c07e9 | 2073 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2074 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2075 | spin_unlock(&inode->i_lock); | |
2076 | spin_unlock(&nfs_access_lru_lock); | |
2077 | nfs_access_free_list(&head); | |
1c3c07e9 | 2078 | } |
1c606fb7 | 2079 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2080 | |
1c3c07e9 TM |
2081 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2082 | { | |
2083 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2084 | struct nfs_access_entry *entry; | |
2085 | ||
2086 | while (n != NULL) { | |
2087 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2088 | ||
2089 | if (cred < entry->cred) | |
2090 | n = n->rb_left; | |
2091 | else if (cred > entry->cred) | |
2092 | n = n->rb_right; | |
2093 | else | |
2094 | return entry; | |
1da177e4 | 2095 | } |
1c3c07e9 TM |
2096 | return NULL; |
2097 | } | |
2098 | ||
af22f94a | 2099 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
1c3c07e9 TM |
2100 | { |
2101 | struct nfs_inode *nfsi = NFS_I(inode); | |
2102 | struct nfs_access_entry *cache; | |
2103 | int err = -ENOENT; | |
2104 | ||
dc59250c | 2105 | spin_lock(&inode->i_lock); |
1c3c07e9 TM |
2106 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
2107 | goto out_zap; | |
2108 | cache = nfs_access_search_rbtree(inode, cred); | |
2109 | if (cache == NULL) | |
2110 | goto out; | |
b4d2314b | 2111 | if (!nfs_have_delegated_attributes(inode) && |
64672d55 | 2112 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
1c3c07e9 TM |
2113 | goto out_stale; |
2114 | res->jiffies = cache->jiffies; | |
2115 | res->cred = cache->cred; | |
2116 | res->mask = cache->mask; | |
cfcea3e8 | 2117 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2118 | err = 0; |
2119 | out: | |
2120 | spin_unlock(&inode->i_lock); | |
2121 | return err; | |
2122 | out_stale: | |
2123 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
cfcea3e8 | 2124 | list_del(&cache->lru); |
1c3c07e9 TM |
2125 | spin_unlock(&inode->i_lock); |
2126 | nfs_access_free_entry(cache); | |
2127 | return -ENOENT; | |
2128 | out_zap: | |
1a81bb8a TM |
2129 | spin_unlock(&inode->i_lock); |
2130 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2131 | return -ENOENT; |
2132 | } | |
2133 | ||
2134 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) | |
2135 | { | |
cfcea3e8 TM |
2136 | struct nfs_inode *nfsi = NFS_I(inode); |
2137 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2138 | struct rb_node **p = &root_node->rb_node; |
2139 | struct rb_node *parent = NULL; | |
2140 | struct nfs_access_entry *entry; | |
2141 | ||
2142 | spin_lock(&inode->i_lock); | |
2143 | while (*p != NULL) { | |
2144 | parent = *p; | |
2145 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2146 | ||
2147 | if (set->cred < entry->cred) | |
2148 | p = &parent->rb_left; | |
2149 | else if (set->cred > entry->cred) | |
2150 | p = &parent->rb_right; | |
2151 | else | |
2152 | goto found; | |
2153 | } | |
2154 | rb_link_node(&set->rb_node, parent, p); | |
2155 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2156 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2157 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2158 | return; |
2159 | found: | |
2160 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2161 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2162 | list_del(&entry->lru); | |
1c3c07e9 TM |
2163 | spin_unlock(&inode->i_lock); |
2164 | nfs_access_free_entry(entry); | |
2165 | } | |
2166 | ||
6168f62c | 2167 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2168 | { |
2169 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2170 | if (cache == NULL) | |
2171 | return; | |
2172 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2173 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2174 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2175 | cache->mask = set->mask; |
1c3c07e9 TM |
2176 | |
2177 | nfs_access_add_rbtree(inode, cache); | |
cfcea3e8 TM |
2178 | |
2179 | /* Update accounting */ | |
2180 | smp_mb__before_atomic_inc(); | |
2181 | atomic_long_inc(&nfs_access_nr_entries); | |
2182 | smp_mb__after_atomic_inc(); | |
2183 | ||
2184 | /* Add inode to global LRU list */ | |
1a81bb8a | 2185 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2186 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2187 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2188 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2189 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2190 | spin_unlock(&nfs_access_lru_lock); |
2191 | } | |
1da177e4 | 2192 | } |
6168f62c WAA |
2193 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2194 | ||
2195 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2196 | { | |
2197 | entry->mask = 0; | |
2198 | if (access_result & NFS4_ACCESS_READ) | |
2199 | entry->mask |= MAY_READ; | |
2200 | if (access_result & | |
2201 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2202 | entry->mask |= MAY_WRITE; | |
2203 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2204 | entry->mask |= MAY_EXEC; | |
2205 | } | |
2206 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2207 | |
2208 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2209 | { | |
2210 | struct nfs_access_entry cache; | |
2211 | int status; | |
2212 | ||
f4ce1299 TM |
2213 | trace_nfs_access_enter(inode); |
2214 | ||
1da177e4 LT |
2215 | status = nfs_access_get_cached(inode, cred, &cache); |
2216 | if (status == 0) | |
f4ce1299 | 2217 | goto out_cached; |
1da177e4 LT |
2218 | |
2219 | /* Be clever: ask server to check for all possible rights */ | |
2220 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2221 | cache.cred = cred; | |
2222 | cache.jiffies = jiffies; | |
2223 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2224 | if (status != 0) { |
2225 | if (status == -ESTALE) { | |
2226 | nfs_zap_caches(inode); | |
2227 | if (!S_ISDIR(inode->i_mode)) | |
2228 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2229 | } | |
f4ce1299 | 2230 | goto out; |
a71ee337 | 2231 | } |
1da177e4 | 2232 | nfs_access_add_cache(inode, &cache); |
f4ce1299 TM |
2233 | out_cached: |
2234 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) | |
2235 | status = -EACCES; | |
1da177e4 | 2236 | out: |
f4ce1299 TM |
2237 | trace_nfs_access_exit(inode, status); |
2238 | return status; | |
1da177e4 LT |
2239 | } |
2240 | ||
af22f94a TM |
2241 | static int nfs_open_permission_mask(int openflags) |
2242 | { | |
2243 | int mask = 0; | |
2244 | ||
f8d9a897 WAA |
2245 | if (openflags & __FMODE_EXEC) { |
2246 | /* ONLY check exec rights */ | |
2247 | mask = MAY_EXEC; | |
2248 | } else { | |
2249 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2250 | mask |= MAY_READ; | |
2251 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2252 | mask |= MAY_WRITE; | |
2253 | } | |
2254 | ||
af22f94a TM |
2255 | return mask; |
2256 | } | |
2257 | ||
2258 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2259 | { | |
2260 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2261 | } | |
89d77c8f | 2262 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2263 | |
10556cb2 | 2264 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2265 | { |
2266 | struct rpc_cred *cred; | |
2267 | int res = 0; | |
2268 | ||
10556cb2 | 2269 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
2270 | return -ECHILD; |
2271 | ||
91d5b470 CL |
2272 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2273 | ||
e6305c43 | 2274 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2275 | goto out; |
2276 | /* Is this sys_access() ? */ | |
9cfcac81 | 2277 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2278 | goto force_lookup; |
2279 | ||
2280 | switch (inode->i_mode & S_IFMT) { | |
2281 | case S_IFLNK: | |
2282 | goto out; | |
2283 | case S_IFREG: | |
1da177e4 LT |
2284 | break; |
2285 | case S_IFDIR: | |
2286 | /* | |
2287 | * Optimize away all write operations, since the server | |
2288 | * will check permissions when we perform the op. | |
2289 | */ | |
2290 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2291 | goto out; | |
2292 | } | |
2293 | ||
2294 | force_lookup: | |
1da177e4 LT |
2295 | if (!NFS_PROTO(inode)->access) |
2296 | goto out_notsup; | |
2297 | ||
98a8e323 | 2298 | cred = rpc_lookup_cred(); |
1da177e4 LT |
2299 | if (!IS_ERR(cred)) { |
2300 | res = nfs_do_access(inode, cred, mask); | |
2301 | put_rpccred(cred); | |
2302 | } else | |
2303 | res = PTR_ERR(cred); | |
1da177e4 | 2304 | out: |
f696a365 MS |
2305 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
2306 | res = -EACCES; | |
2307 | ||
1e8968c5 | 2308 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2309 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2310 | return res; |
2311 | out_notsup: | |
2312 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2313 | if (res == 0) | |
2830ba7f | 2314 | res = generic_permission(inode, mask); |
1e7cb3dc | 2315 | goto out; |
1da177e4 | 2316 | } |
ddda8e0a | 2317 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2318 | |
2319 | /* | |
2320 | * Local variables: | |
2321 | * version-control: t | |
2322 | * kept-new-versions: 5 | |
2323 | * End: | |
2324 | */ |