]>
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, |
9ac3d3e8 | 60 | .iterate_shared = 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 | 71 | { |
311324ad | 72 | struct nfs_inode *nfsi = NFS_I(dir); |
480c2006 BS |
73 | struct nfs_open_dir_context *ctx; |
74 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
75 | if (ctx != NULL) { | |
8ef2ce3e | 76 | ctx->duped = 0; |
311324ad | 77 | ctx->attr_gencount = nfsi->attr_gencount; |
480c2006 | 78 | ctx->dir_cookie = 0; |
8ef2ce3e | 79 | ctx->dup_cookie = 0; |
480c2006 | 80 | ctx->cred = get_rpccred(cred); |
311324ad TM |
81 | spin_lock(&dir->i_lock); |
82 | list_add(&ctx->list, &nfsi->open_files); | |
83 | spin_unlock(&dir->i_lock); | |
0c030806 TM |
84 | return ctx; |
85 | } | |
86 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
87 | } |
88 | ||
311324ad | 89 | static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) |
480c2006 | 90 | { |
311324ad TM |
91 | spin_lock(&dir->i_lock); |
92 | list_del(&ctx->list); | |
93 | spin_unlock(&dir->i_lock); | |
480c2006 BS |
94 | put_rpccred(ctx->cred); |
95 | kfree(ctx); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* |
99 | * Open file | |
100 | */ | |
101 | static int | |
102 | nfs_opendir(struct inode *inode, struct file *filp) | |
103 | { | |
480c2006 BS |
104 | int res = 0; |
105 | struct nfs_open_dir_context *ctx; | |
106 | struct rpc_cred *cred; | |
1da177e4 | 107 | |
6de1472f | 108 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
109 | |
110 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 111 | |
480c2006 BS |
112 | cred = rpc_lookup_cred(); |
113 | if (IS_ERR(cred)) | |
114 | return PTR_ERR(cred); | |
0c030806 | 115 | ctx = alloc_nfs_open_dir_context(inode, cred); |
480c2006 BS |
116 | if (IS_ERR(ctx)) { |
117 | res = PTR_ERR(ctx); | |
118 | goto out; | |
119 | } | |
120 | filp->private_data = ctx; | |
f5a73672 NB |
121 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
122 | /* This is a mountpoint, so d_revalidate will never | |
123 | * have been called, so we need to refresh the | |
124 | * inode (for close-open consistency) ourselves. | |
125 | */ | |
126 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
127 | } | |
480c2006 BS |
128 | out: |
129 | put_rpccred(cred); | |
1da177e4 LT |
130 | return res; |
131 | } | |
132 | ||
480c2006 BS |
133 | static int |
134 | nfs_closedir(struct inode *inode, struct file *filp) | |
135 | { | |
a455589f | 136 | put_nfs_open_dir_context(file_inode(filp), filp->private_data); |
480c2006 BS |
137 | return 0; |
138 | } | |
139 | ||
d1bacf9e BS |
140 | struct nfs_cache_array_entry { |
141 | u64 cookie; | |
142 | u64 ino; | |
143 | struct qstr string; | |
0b26a0bf | 144 | unsigned char d_type; |
d1bacf9e BS |
145 | }; |
146 | ||
147 | struct nfs_cache_array { | |
9ac3d3e8 | 148 | atomic_t refcount; |
88b8e133 | 149 | int size; |
d1bacf9e BS |
150 | int eof_index; |
151 | u64 last_cookie; | |
152 | struct nfs_cache_array_entry array[0]; | |
153 | }; | |
154 | ||
573c4e1e | 155 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
1da177e4 LT |
156 | typedef struct { |
157 | struct file *file; | |
158 | struct page *page; | |
23db8620 | 159 | struct dir_context *ctx; |
1da177e4 | 160 | unsigned long page_index; |
f0dd2136 | 161 | u64 *dir_cookie; |
0aded708 | 162 | u64 last_cookie; |
f0dd2136 | 163 | loff_t current_index; |
1da177e4 | 164 | decode_dirent_t decode; |
d1bacf9e | 165 | |
1f4eab7e | 166 | unsigned long timestamp; |
4704f0e2 | 167 | unsigned long gencount; |
d1bacf9e BS |
168 | unsigned int cache_entry_index; |
169 | unsigned int plus:1; | |
170 | unsigned int eof:1; | |
1da177e4 LT |
171 | } nfs_readdir_descriptor_t; |
172 | ||
d1bacf9e BS |
173 | /* |
174 | * The caller is responsible for calling nfs_readdir_release_array(page) | |
1da177e4 LT |
175 | */ |
176 | static | |
d1bacf9e BS |
177 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
178 | { | |
8cd51a0c | 179 | void *ptr; |
d1bacf9e BS |
180 | if (page == NULL) |
181 | return ERR_PTR(-EIO); | |
8cd51a0c TM |
182 | ptr = kmap(page); |
183 | if (ptr == NULL) | |
184 | return ERR_PTR(-ENOMEM); | |
185 | return ptr; | |
d1bacf9e BS |
186 | } |
187 | ||
188 | static | |
189 | void nfs_readdir_release_array(struct page *page) | |
190 | { | |
191 | kunmap(page); | |
192 | } | |
193 | ||
194 | /* | |
195 | * we are freeing strings created by nfs_add_to_readdir_array() | |
196 | */ | |
197 | static | |
11de3b11 | 198 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 199 | { |
11de3b11 | 200 | struct nfs_cache_array *array; |
d1bacf9e | 201 | int i; |
8cd51a0c | 202 | |
2b86ce2d | 203 | array = kmap_atomic(page); |
9ac3d3e8 AV |
204 | if (atomic_dec_and_test(&array->refcount)) |
205 | for (i = 0; i < array->size; i++) | |
206 | kfree(array->array[i].string.name); | |
2b86ce2d | 207 | kunmap_atomic(array); |
d1bacf9e BS |
208 | } |
209 | ||
9ac3d3e8 AV |
210 | static bool grab_page(struct page *page) |
211 | { | |
212 | struct nfs_cache_array *array = kmap_atomic(page); | |
213 | bool res = atomic_inc_not_zero(&array->refcount); | |
214 | kunmap_atomic(array); | |
215 | return res; | |
216 | } | |
217 | ||
d1bacf9e BS |
218 | /* |
219 | * the caller is responsible for freeing qstr.name | |
220 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
221 | * nfs_clear_readdir_array() | |
222 | */ | |
223 | static | |
4a201d6e | 224 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
225 | { |
226 | string->len = len; | |
227 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
228 | if (string->name == NULL) |
229 | return -ENOMEM; | |
04e4bd1c CM |
230 | /* |
231 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
232 | * in a page cache page which kmemleak does not scan. | |
233 | */ | |
234 | kmemleak_not_leak(string->name); | |
8387ff25 | 235 | string->hash = full_name_hash(NULL, name, len); |
4a201d6e | 236 | return 0; |
d1bacf9e BS |
237 | } |
238 | ||
239 | static | |
240 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
241 | { | |
242 | struct nfs_cache_array *array = nfs_readdir_get_array(page); | |
4a201d6e TM |
243 | struct nfs_cache_array_entry *cache_entry; |
244 | int ret; | |
245 | ||
d1bacf9e BS |
246 | if (IS_ERR(array)) |
247 | return PTR_ERR(array); | |
3020093f TM |
248 | |
249 | cache_entry = &array->array[array->size]; | |
250 | ||
251 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 252 | ret = -ENOSPC; |
3020093f | 253 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 254 | goto out; |
d1bacf9e | 255 | |
4a201d6e TM |
256 | cache_entry->cookie = entry->prev_cookie; |
257 | cache_entry->ino = entry->ino; | |
0b26a0bf | 258 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
259 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
260 | if (ret) | |
261 | goto out; | |
d1bacf9e | 262 | array->last_cookie = entry->cookie; |
8cd51a0c | 263 | array->size++; |
47c716cb | 264 | if (entry->eof != 0) |
d1bacf9e | 265 | array->eof_index = array->size; |
4a201d6e | 266 | out: |
d1bacf9e | 267 | nfs_readdir_release_array(page); |
4a201d6e | 268 | return ret; |
d1bacf9e BS |
269 | } |
270 | ||
271 | static | |
272 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
273 | { | |
23db8620 | 274 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
275 | unsigned int index; |
276 | ||
277 | if (diff < 0) | |
278 | goto out_eof; | |
279 | if (diff >= array->size) { | |
8cd51a0c | 280 | if (array->eof_index >= 0) |
d1bacf9e | 281 | goto out_eof; |
d1bacf9e BS |
282 | return -EAGAIN; |
283 | } | |
284 | ||
285 | index = (unsigned int)diff; | |
286 | *desc->dir_cookie = array->array[index].cookie; | |
287 | desc->cache_entry_index = index; | |
d1bacf9e BS |
288 | return 0; |
289 | out_eof: | |
290 | desc->eof = 1; | |
291 | return -EBADCOOKIE; | |
292 | } | |
293 | ||
4db72b40 JL |
294 | static bool |
295 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
296 | { | |
297 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
298 | return false; | |
299 | smp_rmb(); | |
300 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
301 | } | |
302 | ||
d1bacf9e BS |
303 | static |
304 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
305 | { | |
306 | int i; | |
8ef2ce3e | 307 | loff_t new_pos; |
d1bacf9e BS |
308 | int status = -EAGAIN; |
309 | ||
310 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 311 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 312 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
313 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
314 | ||
8ef2ce3e | 315 | new_pos = desc->current_index + i; |
4db72b40 JL |
316 | if (ctx->attr_gencount != nfsi->attr_gencount || |
317 | !nfs_readdir_inode_mapping_valid(nfsi)) { | |
0c030806 TM |
318 | ctx->duped = 0; |
319 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 320 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
321 | if (ctx->duped > 0 |
322 | && ctx->dup_cookie == *desc->dir_cookie) { | |
323 | if (printk_ratelimit()) { | |
6de1472f | 324 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 325 | "Please contact your server vendor. " |
9581a4ae JL |
326 | "The file: %.*s has duplicate cookie %llu\n", |
327 | desc->file, array->array[i].string.len, | |
328 | array->array[i].string.name, *desc->dir_cookie); | |
0c030806 TM |
329 | } |
330 | status = -ELOOP; | |
331 | goto out; | |
332 | } | |
8ef2ce3e | 333 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 334 | ctx->duped = -1; |
8ef2ce3e | 335 | } |
23db8620 | 336 | desc->ctx->pos = new_pos; |
d1bacf9e | 337 | desc->cache_entry_index = i; |
47c716cb | 338 | return 0; |
d1bacf9e BS |
339 | } |
340 | } | |
47c716cb | 341 | if (array->eof_index >= 0) { |
8cd51a0c | 342 | status = -EBADCOOKIE; |
18fb5fe4 TM |
343 | if (*desc->dir_cookie == array->last_cookie) |
344 | desc->eof = 1; | |
8cd51a0c | 345 | } |
0c030806 | 346 | out: |
d1bacf9e BS |
347 | return status; |
348 | } | |
349 | ||
350 | static | |
351 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
352 | { | |
353 | struct nfs_cache_array *array; | |
47c716cb | 354 | int status; |
d1bacf9e BS |
355 | |
356 | array = nfs_readdir_get_array(desc->page); | |
357 | if (IS_ERR(array)) { | |
358 | status = PTR_ERR(array); | |
359 | goto out; | |
360 | } | |
361 | ||
362 | if (*desc->dir_cookie == 0) | |
363 | status = nfs_readdir_search_for_pos(array, desc); | |
364 | else | |
365 | status = nfs_readdir_search_for_cookie(array, desc); | |
366 | ||
47c716cb | 367 | if (status == -EAGAIN) { |
0aded708 | 368 | desc->last_cookie = array->last_cookie; |
e47c085a | 369 | desc->current_index += array->size; |
47c716cb TM |
370 | desc->page_index++; |
371 | } | |
d1bacf9e BS |
372 | nfs_readdir_release_array(desc->page); |
373 | out: | |
374 | return status; | |
375 | } | |
376 | ||
377 | /* Fill a page with xdr information before transferring to the cache page */ | |
378 | static | |
56e4ebf8 | 379 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 380 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 381 | { |
480c2006 BS |
382 | struct nfs_open_dir_context *ctx = file->private_data; |
383 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 384 | unsigned long timestamp, gencount; |
1da177e4 LT |
385 | int error; |
386 | ||
1da177e4 LT |
387 | again: |
388 | timestamp = jiffies; | |
4704f0e2 | 389 | gencount = nfs_inc_attr_generation_counter(); |
be62a1a8 | 390 | error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages, |
1da177e4 LT |
391 | NFS_SERVER(inode)->dtsize, desc->plus); |
392 | if (error < 0) { | |
393 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
394 | if (error == -ENOTSUPP && desc->plus) { | |
395 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 396 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 LT |
397 | desc->plus = 0; |
398 | goto again; | |
399 | } | |
400 | goto error; | |
401 | } | |
1f4eab7e | 402 | desc->timestamp = timestamp; |
4704f0e2 | 403 | desc->gencount = gencount; |
d1bacf9e BS |
404 | error: |
405 | return error; | |
1da177e4 LT |
406 | } |
407 | ||
573c4e1e CL |
408 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
409 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 410 | { |
573c4e1e | 411 | int error; |
1da177e4 | 412 | |
573c4e1e CL |
413 | error = desc->decode(xdr, entry, desc->plus); |
414 | if (error) | |
415 | return error; | |
d1bacf9e BS |
416 | entry->fattr->time_start = desc->timestamp; |
417 | entry->fattr->gencount = desc->gencount; | |
418 | return 0; | |
1da177e4 LT |
419 | } |
420 | ||
fa923369 TM |
421 | /* Match file and dirent using either filehandle or fileid |
422 | * Note: caller is responsible for checking the fsid | |
423 | */ | |
d39ab9de BS |
424 | static |
425 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
426 | { | |
d8fdb47f | 427 | struct inode *inode; |
fa923369 TM |
428 | struct nfs_inode *nfsi; |
429 | ||
2b0143b5 DH |
430 | if (d_really_is_negative(dentry)) |
431 | return 0; | |
fa923369 | 432 | |
d8fdb47f TM |
433 | inode = d_inode(dentry); |
434 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
435 | return 0; | |
436 | ||
437 | nfsi = NFS_I(inode); | |
fa923369 TM |
438 | if (entry->fattr->fileid == nfsi->fileid) |
439 | return 1; | |
440 | if (nfs_compare_fh(entry->fh, &nfsi->fh) == 0) | |
441 | return 1; | |
d39ab9de BS |
442 | return 0; |
443 | } | |
444 | ||
d69ee9b8 | 445 | static |
23db8620 | 446 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
447 | { |
448 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
449 | return false; | |
450 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
451 | return true; | |
23db8620 | 452 | if (ctx->pos == 0) |
d69ee9b8 TM |
453 | return true; |
454 | return false; | |
455 | } | |
456 | ||
457 | /* | |
458 | * This function is called by the lookup code to request the use of | |
459 | * readdirplus to accelerate any future lookups in the same | |
460 | * directory. | |
461 | */ | |
462 | static | |
463 | void nfs_advise_use_readdirplus(struct inode *dir) | |
464 | { | |
465 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); | |
466 | } | |
467 | ||
311324ad TM |
468 | /* |
469 | * This function is mainly for use by nfs_getattr(). | |
470 | * | |
471 | * If this is an 'ls -l', we want to force use of readdirplus. | |
472 | * Do this by checking if there is an active file descriptor | |
473 | * and calling nfs_advise_use_readdirplus, then forcing a | |
474 | * cache flush. | |
475 | */ | |
476 | void nfs_force_use_readdirplus(struct inode *dir) | |
477 | { | |
478 | if (!list_empty(&NFS_I(dir)->open_files)) { | |
479 | nfs_advise_use_readdirplus(dir); | |
480 | nfs_zap_mapping(dir, dir->i_mapping); | |
481 | } | |
482 | } | |
483 | ||
d39ab9de BS |
484 | static |
485 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
486 | { | |
26fe5750 | 487 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
9ac3d3e8 | 488 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
4a201d6e TM |
489 | struct dentry *dentry; |
490 | struct dentry *alias; | |
2b0143b5 | 491 | struct inode *dir = d_inode(parent); |
d39ab9de | 492 | struct inode *inode; |
aa9c2669 | 493 | int status; |
d39ab9de | 494 | |
fa923369 TM |
495 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) |
496 | return; | |
6c441c25 TM |
497 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
498 | return; | |
78d04af4 TM |
499 | if (filename.len == 0) |
500 | return; | |
501 | /* Validate that the name doesn't contain any illegal '\0' */ | |
502 | if (strnlen(filename.name, filename.len) != filename.len) | |
503 | return; | |
504 | /* ...or '/' */ | |
505 | if (strnchr(filename.name, filename.len, '/')) | |
506 | return; | |
4a201d6e TM |
507 | if (filename.name[0] == '.') { |
508 | if (filename.len == 1) | |
509 | return; | |
510 | if (filename.len == 2 && filename.name[1] == '.') | |
511 | return; | |
512 | } | |
8387ff25 | 513 | filename.hash = full_name_hash(parent, filename.name, filename.len); |
d39ab9de | 514 | |
4a201d6e | 515 | dentry = d_lookup(parent, &filename); |
9ac3d3e8 AV |
516 | again: |
517 | if (!dentry) { | |
518 | dentry = d_alloc_parallel(parent, &filename, &wq); | |
519 | if (IS_ERR(dentry)) | |
520 | return; | |
521 | } | |
522 | if (!d_in_lookup(dentry)) { | |
6c441c25 TM |
523 | /* Is there a mountpoint here? If so, just exit */ |
524 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
525 | &entry->fattr->fsid)) | |
526 | goto out; | |
d39ab9de | 527 | if (nfs_same_file(dentry, entry)) { |
cda57a1e | 528 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
2b0143b5 | 529 | status = nfs_refresh_inode(d_inode(dentry), entry->fattr); |
aa9c2669 | 530 | if (!status) |
2b0143b5 | 531 | nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); |
d39ab9de BS |
532 | goto out; |
533 | } else { | |
5542aa2f | 534 | d_invalidate(dentry); |
d39ab9de | 535 | dput(dentry); |
9ac3d3e8 AV |
536 | dentry = NULL; |
537 | goto again; | |
d39ab9de BS |
538 | } |
539 | } | |
540 | ||
1775fd3e | 541 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
41d28bca | 542 | alias = d_splice_alias(inode, dentry); |
9ac3d3e8 AV |
543 | d_lookup_done(dentry); |
544 | if (alias) { | |
545 | if (IS_ERR(alias)) | |
546 | goto out; | |
547 | dput(dentry); | |
548 | dentry = alias; | |
549 | } | |
550 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
d39ab9de BS |
551 | out: |
552 | dput(dentry); | |
d39ab9de BS |
553 | } |
554 | ||
d1bacf9e BS |
555 | /* Perform conversion from xdr to cache array */ |
556 | static | |
8cd51a0c | 557 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 558 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 559 | { |
babddc72 | 560 | struct xdr_stream stream; |
f7da7a12 | 561 | struct xdr_buf buf; |
6650239a | 562 | struct page *scratch; |
99424380 | 563 | struct nfs_cache_array *array; |
5c346854 TM |
564 | unsigned int count = 0; |
565 | int status; | |
babddc72 | 566 | |
6650239a TM |
567 | scratch = alloc_page(GFP_KERNEL); |
568 | if (scratch == NULL) | |
569 | return -ENOMEM; | |
babddc72 | 570 | |
ce85cfbe BC |
571 | if (buflen == 0) |
572 | goto out_nopages; | |
573 | ||
f7da7a12 | 574 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 575 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
576 | |
577 | do { | |
578 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
579 | if (status != 0) { |
580 | if (status == -EAGAIN) | |
581 | status = 0; | |
99424380 | 582 | break; |
8cd51a0c | 583 | } |
99424380 | 584 | |
5c346854 TM |
585 | count++; |
586 | ||
47c716cb | 587 | if (desc->plus != 0) |
be62a1a8 | 588 | nfs_prime_dcache(file_dentry(desc->file), entry); |
8cd51a0c TM |
589 | |
590 | status = nfs_readdir_add_to_array(entry, page); | |
591 | if (status != 0) | |
592 | break; | |
99424380 BS |
593 | } while (!entry->eof); |
594 | ||
ce85cfbe | 595 | out_nopages: |
47c716cb | 596 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
99424380 | 597 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
598 | if (!IS_ERR(array)) { |
599 | array->eof_index = array->size; | |
600 | status = 0; | |
601 | nfs_readdir_release_array(page); | |
5c346854 TM |
602 | } else |
603 | status = PTR_ERR(array); | |
1da177e4 | 604 | } |
6650239a TM |
605 | |
606 | put_page(scratch); | |
8cd51a0c | 607 | return status; |
56e4ebf8 BS |
608 | } |
609 | ||
610 | static | |
c7e9668e | 611 | void nfs_readdir_free_pages(struct page **pages, unsigned int npages) |
56e4ebf8 BS |
612 | { |
613 | unsigned int i; | |
614 | for (i = 0; i < npages; i++) | |
615 | put_page(pages[i]); | |
616 | } | |
617 | ||
56e4ebf8 BS |
618 | /* |
619 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
0b936e37 | 620 | * to nfs_readdir_free_pagearray |
56e4ebf8 BS |
621 | */ |
622 | static | |
c7e9668e | 623 | int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages) |
56e4ebf8 | 624 | { |
56e4ebf8 BS |
625 | unsigned int i; |
626 | ||
627 | for (i = 0; i < npages; i++) { | |
628 | struct page *page = alloc_page(GFP_KERNEL); | |
629 | if (page == NULL) | |
630 | goto out_freepages; | |
631 | pages[i] = page; | |
632 | } | |
6650239a | 633 | return 0; |
56e4ebf8 | 634 | |
56e4ebf8 | 635 | out_freepages: |
c7e9668e | 636 | nfs_readdir_free_pages(pages, i); |
6650239a | 637 | return -ENOMEM; |
1da177e4 LT |
638 | } |
639 | ||
d1bacf9e BS |
640 | static |
641 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 642 | { |
56e4ebf8 | 643 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
d1bacf9e BS |
644 | struct nfs_entry entry; |
645 | struct file *file = desc->file; | |
646 | struct nfs_cache_array *array; | |
8cd51a0c | 647 | int status = -ENOMEM; |
56e4ebf8 | 648 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
649 | |
650 | entry.prev_cookie = 0; | |
0aded708 | 651 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
652 | entry.eof = 0; |
653 | entry.fh = nfs_alloc_fhandle(); | |
654 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 655 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
656 | if (entry.fh == NULL || entry.fattr == NULL) |
657 | goto out; | |
00a92642 | 658 | |
14c43f76 DQ |
659 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
660 | if (IS_ERR(entry.label)) { | |
661 | status = PTR_ERR(entry.label); | |
662 | goto out; | |
663 | } | |
664 | ||
d1bacf9e | 665 | array = nfs_readdir_get_array(page); |
8cd51a0c TM |
666 | if (IS_ERR(array)) { |
667 | status = PTR_ERR(array); | |
14c43f76 | 668 | goto out_label_free; |
8cd51a0c | 669 | } |
d1bacf9e | 670 | memset(array, 0, sizeof(struct nfs_cache_array)); |
9ac3d3e8 | 671 | atomic_set(&array->refcount, 1); |
d1bacf9e | 672 | array->eof_index = -1; |
00a92642 | 673 | |
c7e9668e | 674 | status = nfs_readdir_alloc_pages(pages, array_size); |
6650239a | 675 | if (status < 0) |
d1bacf9e BS |
676 | goto out_release_array; |
677 | do { | |
ac396128 | 678 | unsigned int pglen; |
56e4ebf8 | 679 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 680 | |
d1bacf9e | 681 | if (status < 0) |
00a92642 | 682 | break; |
ac396128 | 683 | pglen = status; |
6650239a | 684 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
685 | if (status < 0) { |
686 | if (status == -ENOSPC) | |
687 | status = 0; | |
688 | break; | |
689 | } | |
690 | } while (array->eof_index < 0); | |
d1bacf9e | 691 | |
c7e9668e | 692 | nfs_readdir_free_pages(pages, array_size); |
d1bacf9e BS |
693 | out_release_array: |
694 | nfs_readdir_release_array(page); | |
14c43f76 DQ |
695 | out_label_free: |
696 | nfs4_label_free(entry.label); | |
d1bacf9e BS |
697 | out: |
698 | nfs_free_fattr(entry.fattr); | |
699 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
700 | return status; |
701 | } | |
702 | ||
703 | /* | |
d1bacf9e BS |
704 | * Now we cache directories properly, by converting xdr information |
705 | * to an array that can be used for lookups later. This results in | |
706 | * fewer cache pages, since we can store more information on each page. | |
707 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 708 | */ |
d1bacf9e BS |
709 | static |
710 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 711 | { |
496ad9aa | 712 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 713 | int ret; |
1da177e4 | 714 | |
8cd51a0c TM |
715 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
716 | if (ret < 0) | |
d1bacf9e BS |
717 | goto error; |
718 | SetPageUptodate(page); | |
1da177e4 | 719 | |
d1bacf9e BS |
720 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
721 | /* Should never happen */ | |
722 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 723 | } |
d1bacf9e BS |
724 | unlock_page(page); |
725 | return 0; | |
726 | error: | |
727 | unlock_page(page); | |
8cd51a0c | 728 | return ret; |
d1bacf9e | 729 | } |
1da177e4 | 730 | |
d1bacf9e BS |
731 | static |
732 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
733 | { | |
9ac3d3e8 | 734 | nfs_readdir_clear_array(desc->page); |
09cbfeaf | 735 | put_page(desc->page); |
d1bacf9e BS |
736 | desc->page = NULL; |
737 | } | |
738 | ||
739 | static | |
740 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
741 | { | |
9ac3d3e8 AV |
742 | struct page *page; |
743 | ||
744 | for (;;) { | |
93c76a3d | 745 | page = read_cache_page(desc->file->f_mapping, |
d1bacf9e | 746 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
9ac3d3e8 AV |
747 | if (IS_ERR(page) || grab_page(page)) |
748 | break; | |
749 | put_page(page); | |
750 | } | |
751 | return page; | |
1da177e4 LT |
752 | } |
753 | ||
754 | /* | |
d1bacf9e | 755 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 756 | */ |
d1bacf9e BS |
757 | static |
758 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
759 | { | |
760 | int res; | |
761 | ||
762 | desc->page = get_cache_page(desc); | |
763 | if (IS_ERR(desc->page)) | |
764 | return PTR_ERR(desc->page); | |
765 | ||
766 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
767 | if (res != 0) |
768 | cache_page_release(desc); | |
d1bacf9e BS |
769 | return res; |
770 | } | |
771 | ||
772 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
773 | static inline |
774 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
775 | { | |
8cd51a0c | 776 | int res; |
d1bacf9e | 777 | |
0aded708 | 778 | if (desc->page_index == 0) { |
8cd51a0c | 779 | desc->current_index = 0; |
0aded708 TM |
780 | desc->last_cookie = 0; |
781 | } | |
47c716cb | 782 | do { |
d1bacf9e | 783 | res = find_cache_page(desc); |
47c716cb | 784 | } while (res == -EAGAIN); |
1da177e4 LT |
785 | return res; |
786 | } | |
787 | ||
1da177e4 LT |
788 | /* |
789 | * Once we've found the start of the dirent within a page: fill 'er up... | |
790 | */ | |
791 | static | |
23db8620 | 792 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
793 | { |
794 | struct file *file = desc->file; | |
d1bacf9e BS |
795 | int i = 0; |
796 | int res = 0; | |
797 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
798 | struct nfs_open_dir_context *ctx = file->private_data; |
799 | ||
d1bacf9e | 800 | array = nfs_readdir_get_array(desc->page); |
e7c58e97 TM |
801 | if (IS_ERR(array)) { |
802 | res = PTR_ERR(array); | |
803 | goto out; | |
804 | } | |
d1bacf9e BS |
805 | |
806 | for (i = desc->cache_entry_index; i < array->size; i++) { | |
ece0b423 | 807 | struct nfs_cache_array_entry *ent; |
1da177e4 | 808 | |
ece0b423 | 809 | ent = &array->array[i]; |
23db8620 AV |
810 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
811 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 812 | desc->eof = 1; |
1da177e4 | 813 | break; |
ece0b423 | 814 | } |
23db8620 | 815 | desc->ctx->pos++; |
d1bacf9e BS |
816 | if (i < (array->size-1)) |
817 | *desc->dir_cookie = array->array[i+1].cookie; | |
818 | else | |
819 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
820 | if (ctx->duped != 0) |
821 | ctx->duped = 1; | |
1da177e4 | 822 | } |
47c716cb | 823 | if (array->eof_index >= 0) |
8cd51a0c | 824 | desc->eof = 1; |
d1bacf9e BS |
825 | |
826 | nfs_readdir_release_array(desc->page); | |
e7c58e97 | 827 | out: |
d1bacf9e | 828 | cache_page_release(desc); |
1e7cb3dc CL |
829 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
830 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
831 | return res; |
832 | } | |
833 | ||
834 | /* | |
835 | * If we cannot find a cookie in our cache, we suspect that this is | |
836 | * because it points to a deleted file, so we ask the server to return | |
837 | * whatever it thinks is the next entry. We then feed this to filldir. | |
838 | * If all goes well, we should then be able to find our way round the | |
839 | * cache on the next call to readdir_search_pagecache(); | |
840 | * | |
841 | * NOTE: we cannot add the anonymous page to the pagecache because | |
842 | * the data it contains might not be page aligned. Besides, | |
843 | * we should already have a complete representation of the | |
844 | * directory in the page cache by the time we get here. | |
845 | */ | |
846 | static inline | |
23db8620 | 847 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 848 | { |
1da177e4 LT |
849 | struct page *page = NULL; |
850 | int status; | |
496ad9aa | 851 | struct inode *inode = file_inode(desc->file); |
0c030806 | 852 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 853 | |
1e7cb3dc CL |
854 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
855 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
856 | |
857 | page = alloc_page(GFP_HIGHUSER); | |
858 | if (!page) { | |
859 | status = -ENOMEM; | |
860 | goto out; | |
861 | } | |
d1bacf9e | 862 | |
7a8e1dc3 | 863 | desc->page_index = 0; |
0aded708 | 864 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 865 | desc->page = page; |
0c030806 | 866 | ctx->duped = 0; |
7a8e1dc3 | 867 | |
85f8607e TM |
868 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
869 | if (status < 0) | |
1da177e4 LT |
870 | goto out_release; |
871 | ||
23db8620 | 872 | status = nfs_do_filldir(desc); |
1da177e4 | 873 | |
1da177e4 | 874 | out: |
1e7cb3dc | 875 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 876 | __func__, status); |
1da177e4 LT |
877 | return status; |
878 | out_release: | |
d1bacf9e | 879 | cache_page_release(desc); |
1da177e4 LT |
880 | goto out; |
881 | } | |
882 | ||
311324ad TM |
883 | static bool nfs_dir_mapping_need_revalidate(struct inode *dir) |
884 | { | |
885 | struct nfs_inode *nfsi = NFS_I(dir); | |
886 | ||
887 | if (nfs_attribute_cache_expired(dir)) | |
888 | return true; | |
889 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) | |
890 | return true; | |
891 | return false; | |
892 | } | |
893 | ||
00a92642 OG |
894 | /* The file offset position represents the dirent entry number. A |
895 | last cookie cache takes care of the common case of reading the | |
896 | whole directory. | |
1da177e4 | 897 | */ |
23db8620 | 898 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 899 | { |
be62a1a8 | 900 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 901 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
902 | nfs_readdir_descriptor_t my_desc, |
903 | *desc = &my_desc; | |
23db8620 | 904 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 905 | int res = 0; |
1da177e4 | 906 | |
6de1472f AV |
907 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
908 | file, (long long)ctx->pos); | |
91d5b470 CL |
909 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
910 | ||
1da177e4 | 911 | /* |
23db8620 | 912 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 913 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
914 | * to either find the entry with the appropriate number or |
915 | * revalidate the cookie. | |
1da177e4 LT |
916 | */ |
917 | memset(desc, 0, sizeof(*desc)); | |
918 | ||
23db8620 AV |
919 | desc->file = file; |
920 | desc->ctx = ctx; | |
480c2006 | 921 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 922 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
23db8620 | 923 | desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; |
1da177e4 | 924 | |
311324ad | 925 | if (ctx->pos == 0 || nfs_dir_mapping_need_revalidate(inode)) |
07b5ce8e | 926 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
fccca7fc TM |
927 | if (res < 0) |
928 | goto out; | |
929 | ||
47c716cb | 930 | do { |
1da177e4 | 931 | res = readdir_search_pagecache(desc); |
00a92642 | 932 | |
1da177e4 | 933 | if (res == -EBADCOOKIE) { |
ece0b423 | 934 | res = 0; |
1da177e4 | 935 | /* This means either end of directory */ |
d1bacf9e | 936 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 937 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 938 | res = uncached_readdir(desc); |
ece0b423 | 939 | if (res == 0) |
1da177e4 LT |
940 | continue; |
941 | } | |
1da177e4 LT |
942 | break; |
943 | } | |
944 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 945 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 946 | nfs_zap_caches(inode); |
baf57a09 | 947 | desc->page_index = 0; |
1da177e4 | 948 | desc->plus = 0; |
d1bacf9e | 949 | desc->eof = 0; |
1da177e4 LT |
950 | continue; |
951 | } | |
952 | if (res < 0) | |
953 | break; | |
954 | ||
23db8620 | 955 | res = nfs_do_filldir(desc); |
ece0b423 | 956 | if (res < 0) |
1da177e4 | 957 | break; |
47c716cb | 958 | } while (!desc->eof); |
fccca7fc | 959 | out: |
1e7cb3dc CL |
960 | if (res > 0) |
961 | res = 0; | |
6de1472f | 962 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 963 | return res; |
1da177e4 LT |
964 | } |
965 | ||
965c8e59 | 966 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 967 | { |
480c2006 | 968 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 969 | |
6de1472f AV |
970 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
971 | filp, offset, whence); | |
b84e06c5 | 972 | |
965c8e59 | 973 | switch (whence) { |
f0dd2136 TM |
974 | case 1: |
975 | offset += filp->f_pos; | |
976 | case 0: | |
977 | if (offset >= 0) | |
978 | break; | |
979 | default: | |
9ac3d3e8 | 980 | return -EINVAL; |
f0dd2136 TM |
981 | } |
982 | if (offset != filp->f_pos) { | |
983 | filp->f_pos = offset; | |
480c2006 | 984 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 985 | dir_ctx->duped = 0; |
f0dd2136 | 986 | } |
f0dd2136 TM |
987 | return offset; |
988 | } | |
989 | ||
1da177e4 LT |
990 | /* |
991 | * All directory operations under NFS are synchronous, so fsync() | |
992 | * is a dummy operation. | |
993 | */ | |
02c24a82 JB |
994 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
995 | int datasync) | |
1da177e4 | 996 | { |
6de1472f | 997 | struct inode *inode = file_inode(filp); |
7ea80859 | 998 | |
6de1472f | 999 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 1000 | |
5955102c | 1001 | inode_lock(inode); |
6de1472f | 1002 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
5955102c | 1003 | inode_unlock(inode); |
1da177e4 LT |
1004 | return 0; |
1005 | } | |
1006 | ||
bfc69a45 TM |
1007 | /** |
1008 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
1009 | * @dir - pointer to directory inode | |
1010 | * | |
1011 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1012 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1013 | * on the server that might have invalidated our dcache. | |
1014 | * | |
1015 | * The caller should be holding dir->i_lock | |
1016 | */ | |
1017 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1018 | { | |
011935a0 | 1019 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 1020 | } |
89d77c8f | 1021 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 1022 | |
1da177e4 LT |
1023 | /* |
1024 | * A check for whether or not the parent directory has changed. | |
1025 | * In the case it has, we assume that the dentries are untrustworthy | |
1026 | * and may need to be looked up again. | |
912a108d | 1027 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 1028 | */ |
912a108d N |
1029 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
1030 | int rcu_walk) | |
1da177e4 | 1031 | { |
912a108d N |
1032 | int ret; |
1033 | ||
1da177e4 LT |
1034 | if (IS_ROOT(dentry)) |
1035 | return 1; | |
4eec952e TM |
1036 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1037 | return 0; | |
f2c77f4e TM |
1038 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1039 | return 0; | |
1040 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
912a108d N |
1041 | if (rcu_walk) |
1042 | ret = nfs_revalidate_inode_rcu(NFS_SERVER(dir), dir); | |
1043 | else | |
1044 | ret = nfs_revalidate_inode(NFS_SERVER(dir), dir); | |
1045 | if (ret < 0) | |
f2c77f4e TM |
1046 | return 0; |
1047 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) | |
1048 | return 0; | |
1049 | return 1; | |
1da177e4 LT |
1050 | } |
1051 | ||
a12802ca TM |
1052 | /* |
1053 | * Use intent information to check whether or not we're going to do | |
1054 | * an O_EXCL create using this path component. | |
1055 | */ | |
fa3c56bb | 1056 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1057 | { |
1058 | if (NFS_PROTO(dir)->version == 2) | |
1059 | return 0; | |
fa3c56bb | 1060 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1061 | } |
1062 | ||
1d6757fb TM |
1063 | /* |
1064 | * Inode and filehandle revalidation for lookups. | |
1065 | * | |
1066 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1067 | * or if the intent information indicates that we're about to open this | |
1068 | * particular file and the "nocto" mount flag is not set. | |
1069 | * | |
1070 | */ | |
65a0c149 | 1071 | static |
fa3c56bb | 1072 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1073 | { |
1074 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1075 | int ret; |
1da177e4 | 1076 | |
36d43a43 | 1077 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1078 | return 0; |
facc3530 | 1079 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1080 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1081 | goto out_force; |
1082 | /* This is an open(2) */ | |
fa3c56bb AV |
1083 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1084 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1085 | goto out_force; |
65a0c149 TM |
1086 | out: |
1087 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1088 | out_force: |
1fa1e384 N |
1089 | if (flags & LOOKUP_RCU) |
1090 | return -ECHILD; | |
65a0c149 TM |
1091 | ret = __nfs_revalidate_inode(server, inode); |
1092 | if (ret != 0) | |
1093 | return ret; | |
1094 | goto out; | |
1da177e4 LT |
1095 | } |
1096 | ||
1097 | /* | |
1098 | * We judge how long we want to trust negative | |
1099 | * dentries by looking at the parent inode mtime. | |
1100 | * | |
1101 | * If parent mtime has changed, we revalidate, else we wait for a | |
1102 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1103 | * |
1104 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1105 | * suggesting a reval is needed. | |
1da177e4 LT |
1106 | */ |
1107 | static inline | |
1108 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1109 | unsigned int flags) |
1da177e4 | 1110 | { |
1da177e4 | 1111 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1112 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1113 | return 0; |
4eec952e TM |
1114 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1115 | return 1; | |
912a108d | 1116 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1117 | } |
1118 | ||
1119 | /* | |
1120 | * This is called every time the dcache has a lookup hit, | |
1121 | * and we should check whether we can really trust that | |
1122 | * lookup. | |
1123 | * | |
1124 | * NOTE! The hit can be a negative hit too, don't assume | |
1125 | * we have an inode! | |
1126 | * | |
1127 | * If the parent directory is seen to have changed, we throw out the | |
1128 | * cached dentry and do a new lookup. | |
1129 | */ | |
0b728e19 | 1130 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1131 | { |
1132 | struct inode *dir; | |
1133 | struct inode *inode; | |
1134 | struct dentry *parent; | |
e1fb4d05 TM |
1135 | struct nfs_fh *fhandle = NULL; |
1136 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1137 | struct nfs4_label *label = NULL; |
1da177e4 | 1138 | int error; |
1da177e4 | 1139 | |
d51ac1a8 | 1140 | if (flags & LOOKUP_RCU) { |
50d77739 | 1141 | parent = ACCESS_ONCE(dentry->d_parent); |
2b0143b5 | 1142 | dir = d_inode_rcu(parent); |
d51ac1a8 N |
1143 | if (!dir) |
1144 | return -ECHILD; | |
1145 | } else { | |
1146 | parent = dget_parent(dentry); | |
2b0143b5 | 1147 | dir = d_inode(parent); |
d51ac1a8 | 1148 | } |
91d5b470 | 1149 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
2b0143b5 | 1150 | inode = d_inode(dentry); |
1da177e4 LT |
1151 | |
1152 | if (!inode) { | |
912a108d N |
1153 | if (nfs_neg_need_reval(dir, dentry, flags)) { |
1154 | if (flags & LOOKUP_RCU) | |
1155 | return -ECHILD; | |
1da177e4 | 1156 | goto out_bad; |
912a108d | 1157 | } |
d69ee9b8 | 1158 | goto out_valid_noent; |
1da177e4 LT |
1159 | } |
1160 | ||
1161 | if (is_bad_inode(inode)) { | |
d51ac1a8 N |
1162 | if (flags & LOOKUP_RCU) |
1163 | return -ECHILD; | |
6de1472f AV |
1164 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1165 | __func__, dentry); | |
1da177e4 LT |
1166 | goto out_bad; |
1167 | } | |
1168 | ||
011e2a7f | 1169 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1170 | goto out_set_verifier; |
1171 | ||
1da177e4 | 1172 | /* Force a full look up iff the parent directory has changed */ |
912a108d N |
1173 | if (!nfs_is_exclusive_create(dir, flags) && |
1174 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { | |
1175 | ||
1fa1e384 N |
1176 | if (nfs_lookup_verify_inode(inode, flags)) { |
1177 | if (flags & LOOKUP_RCU) | |
1178 | return -ECHILD; | |
1da177e4 | 1179 | goto out_zap_parent; |
1fa1e384 | 1180 | } |
1da177e4 LT |
1181 | goto out_valid; |
1182 | } | |
1183 | ||
912a108d N |
1184 | if (flags & LOOKUP_RCU) |
1185 | return -ECHILD; | |
1186 | ||
1da177e4 LT |
1187 | if (NFS_STALE(inode)) |
1188 | goto out_bad; | |
1189 | ||
e1fb4d05 TM |
1190 | error = -ENOMEM; |
1191 | fhandle = nfs_alloc_fhandle(); | |
1192 | fattr = nfs_alloc_fattr(); | |
1193 | if (fhandle == NULL || fattr == NULL) | |
1194 | goto out_error; | |
1195 | ||
14c43f76 DQ |
1196 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1197 | if (IS_ERR(label)) | |
1198 | goto out_error; | |
1199 | ||
6e0d0be7 | 1200 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
1775fd3e | 1201 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
6e0d0be7 | 1202 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
1da177e4 LT |
1203 | if (error) |
1204 | goto out_bad; | |
e1fb4d05 | 1205 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1206 | goto out_bad; |
e1fb4d05 | 1207 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1208 | goto out_bad; |
1209 | ||
aa9c2669 DQ |
1210 | nfs_setsecurity(inode, fattr, label); |
1211 | ||
e1fb4d05 TM |
1212 | nfs_free_fattr(fattr); |
1213 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1214 | nfs4_label_free(label); |
1215 | ||
15860ab1 | 1216 | out_set_verifier: |
cf8ba45e | 1217 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1218 | out_valid: |
d69ee9b8 TM |
1219 | /* Success: notify readdir to use READDIRPLUS */ |
1220 | nfs_advise_use_readdirplus(dir); | |
1221 | out_valid_noent: | |
d51ac1a8 | 1222 | if (flags & LOOKUP_RCU) { |
50d77739 | 1223 | if (parent != ACCESS_ONCE(dentry->d_parent)) |
d51ac1a8 N |
1224 | return -ECHILD; |
1225 | } else | |
1226 | dput(parent); | |
6de1472f AV |
1227 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", |
1228 | __func__, dentry); | |
1da177e4 LT |
1229 | return 1; |
1230 | out_zap_parent: | |
1231 | nfs_zap_caches(dir); | |
1232 | out_bad: | |
d51ac1a8 | 1233 | WARN_ON(flags & LOOKUP_RCU); |
c44600c9 AV |
1234 | nfs_free_fattr(fattr); |
1235 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1236 | nfs4_label_free(label); |
a1643a92 | 1237 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1238 | if (inode && S_ISDIR(inode->i_mode)) { |
1239 | /* Purge readdir caches. */ | |
1240 | nfs_zap_caches(inode); | |
a3f432bf BF |
1241 | /* |
1242 | * We can't d_drop the root of a disconnected tree: | |
1243 | * its d_hash is on the s_anon list and d_drop() would hide | |
1244 | * it from shrink_dcache_for_unmount(), leading to busy | |
1245 | * inodes on unmount and further oopses. | |
1246 | */ | |
1247 | if (IS_ROOT(dentry)) | |
d9e80b7d | 1248 | goto out_valid; |
1da177e4 | 1249 | } |
1da177e4 | 1250 | dput(parent); |
6de1472f AV |
1251 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", |
1252 | __func__, dentry); | |
1da177e4 | 1253 | return 0; |
e1fb4d05 | 1254 | out_error: |
d51ac1a8 | 1255 | WARN_ON(flags & LOOKUP_RCU); |
e1fb4d05 TM |
1256 | nfs_free_fattr(fattr); |
1257 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1258 | nfs4_label_free(label); |
e1fb4d05 | 1259 | dput(parent); |
6de1472f AV |
1260 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", |
1261 | __func__, dentry, error); | |
e1fb4d05 | 1262 | return error; |
1da177e4 LT |
1263 | } |
1264 | ||
ecf3d1f1 | 1265 | /* |
2b0143b5 | 1266 | * A weaker form of d_revalidate for revalidating just the d_inode(dentry) |
ecf3d1f1 JL |
1267 | * when we don't really care about the dentry name. This is called when a |
1268 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1269 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1270 | * | |
1271 | * In this situation, we just want to verify that the inode itself is OK | |
1272 | * since the dentry might have changed on the server. | |
1273 | */ | |
1274 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1275 | { | |
1276 | int error; | |
2b0143b5 | 1277 | struct inode *inode = d_inode(dentry); |
ecf3d1f1 JL |
1278 | |
1279 | /* | |
1280 | * I believe we can only get a negative dentry here in the case of a | |
1281 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1282 | * eventually need to do something more here. | |
1283 | */ | |
1284 | if (!inode) { | |
6de1472f AV |
1285 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1286 | __func__, dentry); | |
ecf3d1f1 JL |
1287 | return 1; |
1288 | } | |
1289 | ||
1290 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1291 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1292 | __func__, dentry); | |
ecf3d1f1 JL |
1293 | return 0; |
1294 | } | |
1295 | ||
1296 | error = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1297 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", | |
1298 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1299 | return !error; | |
1300 | } | |
1301 | ||
1da177e4 LT |
1302 | /* |
1303 | * This is called from dput() when d_count is going to 0. | |
1304 | */ | |
fe15ce44 | 1305 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1306 | { |
6de1472f AV |
1307 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1308 | dentry, dentry->d_flags); | |
1da177e4 | 1309 | |
77f11192 | 1310 | /* Unhash any dentry with a stale inode */ |
2b0143b5 | 1311 | if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) |
77f11192 TM |
1312 | return 1; |
1313 | ||
1da177e4 LT |
1314 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1315 | /* Unhash it, so that ->d_iput() would be called */ | |
1316 | return 1; | |
1317 | } | |
1318 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1319 | /* Unhash it, so that ancestors of killed async unlink | |
1320 | * files will be cleaned up during umount */ | |
1321 | return 1; | |
1322 | } | |
1323 | return 0; | |
1324 | ||
1325 | } | |
1326 | ||
1f018458 | 1327 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1328 | static void nfs_drop_nlink(struct inode *inode) |
1329 | { | |
1330 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1331 | /* drop the inode if we're reasonably sure this is the last link */ |
1332 | if (inode->i_nlink == 1) | |
1333 | clear_nlink(inode); | |
1334 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1335 | spin_unlock(&inode->i_lock); |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | /* |
1339 | * Called when the dentry loses inode. | |
1340 | * We use it to clean up silly-renamed files. | |
1341 | */ | |
1342 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1343 | { | |
83672d39 NB |
1344 | if (S_ISDIR(inode->i_mode)) |
1345 | /* drop any readdir cache as it could easily be old */ | |
1346 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1347 | ||
1da177e4 | 1348 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1349 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1350 | nfs_drop_nlink(inode); |
1da177e4 | 1351 | } |
1da177e4 LT |
1352 | iput(inode); |
1353 | } | |
1354 | ||
b1942c5f AV |
1355 | static void nfs_d_release(struct dentry *dentry) |
1356 | { | |
1357 | /* free cached devname value, if it survived that far */ | |
1358 | if (unlikely(dentry->d_fsdata)) { | |
1359 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1360 | WARN_ON(1); | |
1361 | else | |
1362 | kfree(dentry->d_fsdata); | |
1363 | } | |
1364 | } | |
1365 | ||
f786aa90 | 1366 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1367 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1368 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1369 | .d_delete = nfs_dentry_delete, |
1370 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1371 | .d_automount = nfs_d_automount, |
b1942c5f | 1372 | .d_release = nfs_d_release, |
1da177e4 | 1373 | }; |
ddda8e0a | 1374 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1375 | |
597d9289 | 1376 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1377 | { |
1378 | struct dentry *res; | |
1379 | struct inode *inode = NULL; | |
e1fb4d05 TM |
1380 | struct nfs_fh *fhandle = NULL; |
1381 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1382 | struct nfs4_label *label = NULL; |
1da177e4 | 1383 | int error; |
1da177e4 | 1384 | |
6de1472f | 1385 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1386 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 | 1387 | |
130f9ab7 AV |
1388 | if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) |
1389 | return ERR_PTR(-ENAMETOOLONG); | |
1da177e4 | 1390 | |
fd684071 TM |
1391 | /* |
1392 | * If we're doing an exclusive create, optimize away the lookup | |
1393 | * but don't hash the dentry. | |
1394 | */ | |
130f9ab7 AV |
1395 | if (nfs_is_exclusive_create(dir, flags)) |
1396 | return NULL; | |
1da177e4 | 1397 | |
e1fb4d05 TM |
1398 | res = ERR_PTR(-ENOMEM); |
1399 | fhandle = nfs_alloc_fhandle(); | |
1400 | fattr = nfs_alloc_fattr(); | |
1401 | if (fhandle == NULL || fattr == NULL) | |
1402 | goto out; | |
1403 | ||
14c43f76 DQ |
1404 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1405 | if (IS_ERR(label)) | |
1406 | goto out; | |
1407 | ||
6e0d0be7 | 1408 | trace_nfs_lookup_enter(dir, dentry, flags); |
1775fd3e | 1409 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1410 | if (error == -ENOENT) |
1411 | goto no_entry; | |
1412 | if (error < 0) { | |
1413 | res = ERR_PTR(error); | |
bf130914 | 1414 | goto out_label; |
1da177e4 | 1415 | } |
1775fd3e | 1416 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1417 | res = ERR_CAST(inode); |
03f28e3a | 1418 | if (IS_ERR(res)) |
bf130914 | 1419 | goto out_label; |
54ceac45 | 1420 | |
d69ee9b8 TM |
1421 | /* Success: notify readdir to use READDIRPLUS */ |
1422 | nfs_advise_use_readdirplus(dir); | |
1423 | ||
1da177e4 | 1424 | no_entry: |
41d28bca | 1425 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1426 | if (res != NULL) { |
1427 | if (IS_ERR(res)) | |
bf130914 | 1428 | goto out_label; |
1da177e4 | 1429 | dentry = res; |
9eaef27b | 1430 | } |
1da177e4 | 1431 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
bf130914 | 1432 | out_label: |
6e0d0be7 | 1433 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1434 | nfs4_label_free(label); |
1da177e4 | 1435 | out: |
e1fb4d05 TM |
1436 | nfs_free_fattr(fattr); |
1437 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1438 | return res; |
1439 | } | |
ddda8e0a | 1440 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1441 | |
89d77c8f | 1442 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1443 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1444 | |
f786aa90 | 1445 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1446 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1447 | .d_delete = nfs_dentry_delete, |
1448 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1449 | .d_automount = nfs_d_automount, |
b1942c5f | 1450 | .d_release = nfs_d_release, |
1da177e4 | 1451 | }; |
89d77c8f | 1452 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1453 | |
8a5e929d AV |
1454 | static fmode_t flags_to_mode(int flags) |
1455 | { | |
1456 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1457 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1458 | res |= FMODE_READ; | |
1459 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1460 | res |= FMODE_WRITE; | |
1461 | return res; | |
1462 | } | |
1463 | ||
51141598 | 1464 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
cd9a1c0e | 1465 | { |
5ede7b1c | 1466 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
cd9a1c0e TM |
1467 | } |
1468 | ||
1469 | static int do_open(struct inode *inode, struct file *filp) | |
1470 | { | |
f1fe29b4 | 1471 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1472 | return 0; |
1473 | } | |
1474 | ||
d9585277 AV |
1475 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1476 | struct dentry *dentry, | |
30d90494 | 1477 | struct file *file, unsigned open_flags, |
d9585277 | 1478 | int *opened) |
cd9a1c0e | 1479 | { |
0dd2b474 MS |
1480 | int err; |
1481 | ||
30d90494 AV |
1482 | err = finish_open(file, dentry, do_open, opened); |
1483 | if (err) | |
d9585277 | 1484 | goto out; |
30d90494 | 1485 | nfs_file_set_open_context(file, ctx); |
0dd2b474 | 1486 | |
cd9a1c0e | 1487 | out: |
d9585277 | 1488 | return err; |
cd9a1c0e TM |
1489 | } |
1490 | ||
73a79706 BS |
1491 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1492 | struct file *file, unsigned open_flags, | |
1493 | umode_t mode, int *opened) | |
1da177e4 | 1494 | { |
c94c0953 | 1495 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
cd9a1c0e | 1496 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1497 | struct dentry *res; |
1498 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1499 | struct inode *inode; |
1472b83e | 1500 | unsigned int lookup_flags = 0; |
c94c0953 | 1501 | bool switched = false; |
898f635c | 1502 | int err; |
1da177e4 | 1503 | |
0dd2b474 | 1504 | /* Expect a negative dentry */ |
2b0143b5 | 1505 | BUG_ON(d_inode(dentry)); |
0dd2b474 | 1506 | |
1e8968c5 | 1507 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1508 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1509 | |
9597c13b JL |
1510 | err = nfs_check_flags(open_flags); |
1511 | if (err) | |
1512 | return err; | |
1513 | ||
0dd2b474 MS |
1514 | /* NFS only supports OPEN on regular files */ |
1515 | if ((open_flags & O_DIRECTORY)) { | |
00699ad8 | 1516 | if (!d_in_lookup(dentry)) { |
0dd2b474 MS |
1517 | /* |
1518 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1519 | * revalidated and is fine, no need to perform lookup | |
1520 | * again | |
1521 | */ | |
d9585277 | 1522 | return -ENOENT; |
0dd2b474 | 1523 | } |
1472b83e | 1524 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1525 | goto no_open; |
02a913a7 | 1526 | } |
1da177e4 | 1527 | |
0dd2b474 | 1528 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1529 | return -ENAMETOOLONG; |
cd9a1c0e | 1530 | |
0dd2b474 | 1531 | if (open_flags & O_CREAT) { |
536e43d1 | 1532 | attr.ia_valid |= ATTR_MODE; |
0dd2b474 MS |
1533 | attr.ia_mode = mode & ~current_umask(); |
1534 | } | |
536e43d1 TM |
1535 | if (open_flags & O_TRUNC) { |
1536 | attr.ia_valid |= ATTR_SIZE; | |
1537 | attr.ia_size = 0; | |
cd9a1c0e TM |
1538 | } |
1539 | ||
c94c0953 AV |
1540 | if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { |
1541 | d_drop(dentry); | |
1542 | switched = true; | |
1543 | dentry = d_alloc_parallel(dentry->d_parent, | |
1544 | &dentry->d_name, &wq); | |
1545 | if (IS_ERR(dentry)) | |
1546 | return PTR_ERR(dentry); | |
1547 | if (unlikely(!d_in_lookup(dentry))) | |
1548 | return finish_no_open(file, dentry); | |
1549 | } | |
1550 | ||
0dd2b474 MS |
1551 | ctx = create_nfs_open_context(dentry, open_flags); |
1552 | err = PTR_ERR(ctx); | |
1553 | if (IS_ERR(ctx)) | |
d9585277 | 1554 | goto out; |
0dd2b474 | 1555 | |
6e0d0be7 | 1556 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
5bc2afc2 | 1557 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened); |
f46e0bd3 | 1558 | if (IS_ERR(inode)) { |
0dd2b474 | 1559 | err = PTR_ERR(inode); |
6e0d0be7 | 1560 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1561 | put_nfs_open_context(ctx); |
d20cb71d | 1562 | d_drop(dentry); |
0dd2b474 MS |
1563 | switch (err) { |
1564 | case -ENOENT: | |
1565 | d_add(dentry, NULL); | |
809fd143 | 1566 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1567 | break; |
1568 | case -EISDIR: | |
1569 | case -ENOTDIR: | |
1570 | goto no_open; | |
1571 | case -ELOOP: | |
1572 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1573 | goto no_open; |
0dd2b474 | 1574 | break; |
1da177e4 | 1575 | /* case -EINVAL: */ |
0dd2b474 MS |
1576 | default: |
1577 | break; | |
1da177e4 | 1578 | } |
d9585277 | 1579 | goto out; |
cd9a1c0e | 1580 | } |
0dd2b474 | 1581 | |
275bb307 | 1582 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
6e0d0be7 | 1583 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1584 | put_nfs_open_context(ctx); |
d9585277 | 1585 | out: |
c94c0953 AV |
1586 | if (unlikely(switched)) { |
1587 | d_lookup_done(dentry); | |
1588 | dput(dentry); | |
1589 | } | |
d9585277 | 1590 | return err; |
0dd2b474 | 1591 | |
1da177e4 | 1592 | no_open: |
1472b83e | 1593 | res = nfs_lookup(dir, dentry, lookup_flags); |
c94c0953 AV |
1594 | if (switched) { |
1595 | d_lookup_done(dentry); | |
1596 | if (!res) | |
1597 | res = dentry; | |
1598 | else | |
1599 | dput(dentry); | |
1600 | } | |
0dd2b474 | 1601 | if (IS_ERR(res)) |
c94c0953 | 1602 | return PTR_ERR(res); |
e45198a6 | 1603 | return finish_no_open(file, res); |
1da177e4 | 1604 | } |
89d77c8f | 1605 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1606 | |
0b728e19 | 1607 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1608 | { |
657e94b6 | 1609 | struct inode *inode; |
50de348c | 1610 | int ret = 0; |
1da177e4 | 1611 | |
fa3c56bb | 1612 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1613 | goto no_open; |
1614 | if (d_mountpoint(dentry)) | |
5584c306 | 1615 | goto no_open; |
49f9a0fa TM |
1616 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1617 | goto no_open; | |
2b484297 | 1618 | |
2b0143b5 | 1619 | inode = d_inode(dentry); |
2b484297 | 1620 | |
1da177e4 LT |
1621 | /* We can't create new files in nfs_open_revalidate(), so we |
1622 | * optimize away revalidation of negative dentries. | |
1623 | */ | |
216d5d06 | 1624 | if (inode == NULL) { |
49317a7f N |
1625 | struct dentry *parent; |
1626 | struct inode *dir; | |
1627 | ||
912a108d | 1628 | if (flags & LOOKUP_RCU) { |
50d77739 | 1629 | parent = ACCESS_ONCE(dentry->d_parent); |
2b0143b5 | 1630 | dir = d_inode_rcu(parent); |
912a108d N |
1631 | if (!dir) |
1632 | return -ECHILD; | |
1633 | } else { | |
1634 | parent = dget_parent(dentry); | |
2b0143b5 | 1635 | dir = d_inode(parent); |
912a108d | 1636 | } |
fa3c56bb | 1637 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1638 | ret = 1; |
912a108d N |
1639 | else if (flags & LOOKUP_RCU) |
1640 | ret = -ECHILD; | |
1641 | if (!(flags & LOOKUP_RCU)) | |
1642 | dput(parent); | |
50d77739 | 1643 | else if (parent != ACCESS_ONCE(dentry->d_parent)) |
912a108d | 1644 | return -ECHILD; |
1da177e4 | 1645 | goto out; |
216d5d06 TM |
1646 | } |
1647 | ||
1da177e4 LT |
1648 | /* NFS only supports OPEN on regular files */ |
1649 | if (!S_ISREG(inode->i_mode)) | |
49317a7f | 1650 | goto no_open; |
1da177e4 | 1651 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1652 | if (flags & LOOKUP_EXCL) |
49317a7f | 1653 | goto no_open; |
1da177e4 | 1654 | |
0ef97dcf MS |
1655 | /* Let f_op->open() actually open (and revalidate) the file */ |
1656 | ret = 1; | |
536e43d1 | 1657 | |
1da177e4 | 1658 | out: |
1da177e4 | 1659 | return ret; |
535918f1 | 1660 | |
5584c306 | 1661 | no_open: |
0b728e19 | 1662 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1663 | } |
1664 | ||
1da177e4 LT |
1665 | #endif /* CONFIG_NFSV4 */ |
1666 | ||
1da177e4 LT |
1667 | /* |
1668 | * Code common to create, mkdir, and mknod. | |
1669 | */ | |
1670 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1671 | struct nfs_fattr *fattr, |
1672 | struct nfs4_label *label) | |
1da177e4 | 1673 | { |
fab728e1 | 1674 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 1675 | struct inode *dir = d_inode(parent); |
1da177e4 LT |
1676 | struct inode *inode; |
1677 | int error = -EACCES; | |
1678 | ||
fab728e1 TM |
1679 | d_drop(dentry); |
1680 | ||
1da177e4 | 1681 | /* We may have been initialized further down */ |
2b0143b5 | 1682 | if (d_really_is_positive(dentry)) |
fab728e1 | 1683 | goto out; |
1da177e4 | 1684 | if (fhandle->size == 0) { |
1775fd3e | 1685 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1686 | if (error) |
fab728e1 | 1687 | goto out_error; |
1da177e4 | 1688 | } |
5724ab37 | 1689 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1690 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1691 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1692 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1693 | if (error < 0) |
fab728e1 | 1694 | goto out_error; |
1da177e4 | 1695 | } |
1775fd3e | 1696 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1697 | error = PTR_ERR(inode); |
1698 | if (IS_ERR(inode)) | |
fab728e1 TM |
1699 | goto out_error; |
1700 | d_add(dentry, inode); | |
1701 | out: | |
1702 | dput(parent); | |
1da177e4 | 1703 | return 0; |
fab728e1 TM |
1704 | out_error: |
1705 | nfs_mark_for_revalidate(dir); | |
1706 | dput(parent); | |
1707 | return error; | |
1da177e4 | 1708 | } |
ddda8e0a | 1709 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1710 | |
1711 | /* | |
1712 | * Following a failed create operation, we drop the dentry rather | |
1713 | * than retain a negative dentry. This avoids a problem in the event | |
1714 | * that the operation succeeded on the server, but an error in the | |
1715 | * reply path made it appear to have failed. | |
1716 | */ | |
597d9289 | 1717 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1718 | umode_t mode, bool excl) |
1da177e4 LT |
1719 | { |
1720 | struct iattr attr; | |
ebfc3b49 | 1721 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1722 | int error; |
1da177e4 | 1723 | |
1e8968c5 | 1724 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 1725 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1726 | |
1727 | attr.ia_mode = mode; | |
1728 | attr.ia_valid = ATTR_MODE; | |
1729 | ||
8b0ad3d4 | 1730 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1731 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1732 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1733 | if (error != 0) |
1734 | goto out_err; | |
1da177e4 LT |
1735 | return 0; |
1736 | out_err: | |
1da177e4 LT |
1737 | d_drop(dentry); |
1738 | return error; | |
1739 | } | |
ddda8e0a | 1740 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1741 | |
1742 | /* | |
1743 | * See comments for nfs_proc_create regarding failed operations. | |
1744 | */ | |
597d9289 | 1745 | int |
1a67aafb | 1746 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1747 | { |
1748 | struct iattr attr; | |
1749 | int status; | |
1750 | ||
1e8968c5 | 1751 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 1752 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1753 | |
1da177e4 LT |
1754 | attr.ia_mode = mode; |
1755 | attr.ia_valid = ATTR_MODE; | |
1756 | ||
1ca42382 | 1757 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1758 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1759 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1760 | if (status != 0) |
1761 | goto out_err; | |
1da177e4 LT |
1762 | return 0; |
1763 | out_err: | |
1da177e4 LT |
1764 | d_drop(dentry); |
1765 | return status; | |
1766 | } | |
ddda8e0a | 1767 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1768 | |
1769 | /* | |
1770 | * See comments for nfs_proc_create regarding failed operations. | |
1771 | */ | |
597d9289 | 1772 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1773 | { |
1774 | struct iattr attr; | |
1775 | int error; | |
1776 | ||
1e8968c5 | 1777 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 1778 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1779 | |
1780 | attr.ia_valid = ATTR_MODE; | |
1781 | attr.ia_mode = mode | S_IFDIR; | |
1782 | ||
1ca42382 | 1783 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1784 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1785 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1786 | if (error != 0) |
1787 | goto out_err; | |
1da177e4 LT |
1788 | return 0; |
1789 | out_err: | |
1790 | d_drop(dentry); | |
1da177e4 LT |
1791 | return error; |
1792 | } | |
ddda8e0a | 1793 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1794 | |
d45b9d8b TM |
1795 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1796 | { | |
dc3f4198 | 1797 | if (simple_positive(dentry)) |
d45b9d8b TM |
1798 | d_delete(dentry); |
1799 | } | |
1800 | ||
597d9289 | 1801 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1802 | { |
1803 | int error; | |
1804 | ||
1e8968c5 | 1805 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 1806 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1807 | |
1ca42382 | 1808 | trace_nfs_rmdir_enter(dir, dentry); |
2b0143b5 | 1809 | if (d_really_is_positive(dentry)) { |
884be175 | 1810 | down_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1811 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1812 | /* Ensure the VFS deletes this inode */ | |
1813 | switch (error) { | |
1814 | case 0: | |
2b0143b5 | 1815 | clear_nlink(d_inode(dentry)); |
ba6c0592 TM |
1816 | break; |
1817 | case -ENOENT: | |
1818 | nfs_dentry_handle_enoent(dentry); | |
1819 | } | |
884be175 | 1820 | up_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1821 | } else |
1822 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1823 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1824 | |
1825 | return error; | |
1826 | } | |
ddda8e0a | 1827 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1828 | |
1da177e4 LT |
1829 | /* |
1830 | * Remove a file after making sure there are no pending writes, | |
1831 | * and after checking that the file has only one user. | |
1832 | * | |
1833 | * We invalidate the attribute cache and free the inode prior to the operation | |
1834 | * to avoid possible races if the server reuses the inode. | |
1835 | */ | |
1836 | static int nfs_safe_remove(struct dentry *dentry) | |
1837 | { | |
2b0143b5 DH |
1838 | struct inode *dir = d_inode(dentry->d_parent); |
1839 | struct inode *inode = d_inode(dentry); | |
1da177e4 LT |
1840 | int error = -EBUSY; |
1841 | ||
6de1472f | 1842 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
1843 | |
1844 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1845 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1846 | error = 0; | |
1847 | goto out; | |
1848 | } | |
1849 | ||
1ca42382 | 1850 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1851 | if (inode != NULL) { |
57ec14c5 | 1852 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1853 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1854 | if (error == 0) |
1b83d707 | 1855 | nfs_drop_nlink(inode); |
1da177e4 LT |
1856 | } else |
1857 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1858 | if (error == -ENOENT) |
1859 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1860 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1861 | out: |
1862 | return error; | |
1863 | } | |
1864 | ||
1865 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1866 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1867 | * | |
1868 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1869 | */ | |
597d9289 | 1870 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1871 | { |
1872 | int error; | |
1873 | int need_rehash = 0; | |
1874 | ||
1e8968c5 | 1875 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 1876 | dir->i_ino, dentry); |
1da177e4 | 1877 | |
1ca42382 | 1878 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1879 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1880 | if (d_count(dentry) > 1) { |
1da177e4 | 1881 | spin_unlock(&dentry->d_lock); |
ccfeb506 | 1882 | /* Start asynchronous writeout of the inode */ |
2b0143b5 | 1883 | write_inode_now(d_inode(dentry), 0); |
1da177e4 | 1884 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1885 | goto out; |
1da177e4 LT |
1886 | } |
1887 | if (!d_unhashed(dentry)) { | |
1888 | __d_drop(dentry); | |
1889 | need_rehash = 1; | |
1890 | } | |
1891 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1892 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1893 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1894 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1895 | } else if (need_rehash) | |
1896 | d_rehash(dentry); | |
1ca42382 TM |
1897 | out: |
1898 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1899 | return error; |
1900 | } | |
ddda8e0a | 1901 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1902 | |
873101b3 CL |
1903 | /* |
1904 | * To create a symbolic link, most file systems instantiate a new inode, | |
1905 | * add a page to it containing the path, then write it out to the disk | |
1906 | * using prepare_write/commit_write. | |
1907 | * | |
1908 | * Unfortunately the NFS client can't create the in-core inode first | |
1909 | * because it needs a file handle to create an in-core inode (see | |
1910 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1911 | * symlink request has completed on the server. | |
1912 | * | |
1913 | * So instead we allocate a raw page, copy the symname into it, then do | |
1914 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1915 | * now have a new file handle and can instantiate an in-core NFS inode | |
1916 | * and move the raw page into its mapping. | |
1917 | */ | |
597d9289 | 1918 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1919 | { |
873101b3 CL |
1920 | struct page *page; |
1921 | char *kaddr; | |
1da177e4 | 1922 | struct iattr attr; |
873101b3 | 1923 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1924 | int error; |
1925 | ||
1e8968c5 | 1926 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 1927 | dir->i_ino, dentry, symname); |
1da177e4 | 1928 | |
873101b3 CL |
1929 | if (pathlen > PAGE_SIZE) |
1930 | return -ENAMETOOLONG; | |
1da177e4 | 1931 | |
873101b3 CL |
1932 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1933 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1934 | |
e8ecde25 | 1935 | page = alloc_page(GFP_USER); |
76566991 | 1936 | if (!page) |
873101b3 | 1937 | return -ENOMEM; |
873101b3 | 1938 | |
e8ecde25 | 1939 | kaddr = page_address(page); |
873101b3 CL |
1940 | memcpy(kaddr, symname, pathlen); |
1941 | if (pathlen < PAGE_SIZE) | |
1942 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
873101b3 | 1943 | |
1ca42382 | 1944 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 1945 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 1946 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 1947 | if (error != 0) { |
1e8968c5 | 1948 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 1949 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 1950 | dentry, symname, error); |
1da177e4 | 1951 | d_drop(dentry); |
873101b3 | 1952 | __free_page(page); |
873101b3 CL |
1953 | return error; |
1954 | } | |
1955 | ||
1956 | /* | |
1957 | * No big deal if we can't add this page to the page cache here. | |
1958 | * READLINK will get the missing page from the server if needed. | |
1959 | */ | |
2b0143b5 | 1960 | if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, |
873101b3 | 1961 | GFP_KERNEL)) { |
873101b3 CL |
1962 | SetPageUptodate(page); |
1963 | unlock_page(page); | |
a0b54add RA |
1964 | /* |
1965 | * add_to_page_cache_lru() grabs an extra page refcount. | |
1966 | * Drop it here to avoid leaking this page later. | |
1967 | */ | |
09cbfeaf | 1968 | put_page(page); |
873101b3 CL |
1969 | } else |
1970 | __free_page(page); | |
1971 | ||
873101b3 | 1972 | return 0; |
1da177e4 | 1973 | } |
ddda8e0a | 1974 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1975 | |
597d9289 | 1976 | int |
1da177e4 LT |
1977 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1978 | { | |
2b0143b5 | 1979 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
1980 | int error; |
1981 | ||
6de1472f AV |
1982 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
1983 | old_dentry, dentry); | |
1da177e4 | 1984 | |
1fd1085b | 1985 | trace_nfs_link_enter(inode, dir, dentry); |
57ec14c5 | 1986 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1987 | |
9697d234 | 1988 | d_drop(dentry); |
1da177e4 | 1989 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1990 | if (error == 0) { |
7de9c6ee | 1991 | ihold(inode); |
9697d234 | 1992 | d_add(dentry, inode); |
cf809556 | 1993 | } |
1fd1085b | 1994 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
1995 | return error; |
1996 | } | |
ddda8e0a | 1997 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1998 | |
1999 | /* | |
2000 | * RENAME | |
2001 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
2002 | * different file handle for the same inode after a rename (e.g. when | |
2003 | * moving to a different directory). A fail-safe method to do so would | |
2004 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
2005 | * rename the old file using the sillyrename stuff. This way, the original | |
2006 | * file in old_dir will go away when the last process iput()s the inode. | |
2007 | * | |
2008 | * FIXED. | |
2009 | * | |
2010 | * It actually works quite well. One needs to have the possibility for | |
2011 | * at least one ".nfs..." file in each directory the file ever gets | |
2012 | * moved or linked to which happens automagically with the new | |
2013 | * implementation that only depends on the dcache stuff instead of | |
2014 | * using the inode layer | |
2015 | * | |
2016 | * Unfortunately, things are a little more complicated than indicated | |
2017 | * above. For a cross-directory move, we want to make sure we can get | |
2018 | * rid of the old inode after the operation. This means there must be | |
2019 | * no pending writes (if it's a file), and the use count must be 1. | |
2020 | * If these conditions are met, we can drop the dentries before doing | |
2021 | * the rename. | |
2022 | */ | |
597d9289 | 2023 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
2024 | struct inode *new_dir, struct dentry *new_dentry) |
2025 | { | |
2b0143b5 DH |
2026 | struct inode *old_inode = d_inode(old_dentry); |
2027 | struct inode *new_inode = d_inode(new_dentry); | |
1da177e4 | 2028 | struct dentry *dentry = NULL, *rehash = NULL; |
80a491fd | 2029 | struct rpc_task *task; |
1da177e4 LT |
2030 | int error = -EBUSY; |
2031 | ||
6de1472f AV |
2032 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
2033 | old_dentry, new_dentry, | |
84d08fa8 | 2034 | d_count(new_dentry)); |
1da177e4 | 2035 | |
70ded201 | 2036 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 2037 | /* |
28f79a1a MS |
2038 | * For non-directories, check whether the target is busy and if so, |
2039 | * make a copy of the dentry and then do a silly-rename. If the | |
2040 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2041 | * the new target. | |
1da177e4 | 2042 | */ |
27226104 MS |
2043 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2044 | /* | |
2045 | * To prevent any new references to the target during the | |
2046 | * rename, we unhash the dentry in advance. | |
2047 | */ | |
2048 | if (!d_unhashed(new_dentry)) { | |
2049 | d_drop(new_dentry); | |
2050 | rehash = new_dentry; | |
2051 | } | |
1da177e4 | 2052 | |
84d08fa8 | 2053 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2054 | int err; |
2055 | ||
2056 | /* copy the target dentry's name */ | |
2057 | dentry = d_alloc(new_dentry->d_parent, | |
2058 | &new_dentry->d_name); | |
2059 | if (!dentry) | |
2060 | goto out; | |
2061 | ||
2062 | /* silly-rename the existing target ... */ | |
2063 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2064 | if (err) |
27226104 | 2065 | goto out; |
24e93025 MS |
2066 | |
2067 | new_dentry = dentry; | |
56335936 | 2068 | rehash = NULL; |
24e93025 | 2069 | new_inode = NULL; |
27226104 | 2070 | } |
b1e4adf4 | 2071 | } |
1da177e4 | 2072 | |
57ec14c5 | 2073 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 2074 | if (new_inode != NULL) |
57ec14c5 | 2075 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 2076 | |
80a491fd JL |
2077 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
2078 | if (IS_ERR(task)) { | |
2079 | error = PTR_ERR(task); | |
2080 | goto out; | |
2081 | } | |
2082 | ||
2083 | error = rpc_wait_for_completion_task(task); | |
2084 | if (error == 0) | |
2085 | error = task->tk_status; | |
2086 | rpc_put_task(task); | |
5ba7cc48 | 2087 | nfs_mark_for_revalidate(old_inode); |
1da177e4 LT |
2088 | out: |
2089 | if (rehash) | |
2090 | d_rehash(rehash); | |
70ded201 TM |
2091 | trace_nfs_rename_exit(old_dir, old_dentry, |
2092 | new_dir, new_dentry, error); | |
1da177e4 | 2093 | if (!error) { |
b1e4adf4 TM |
2094 | if (new_inode != NULL) |
2095 | nfs_drop_nlink(new_inode); | |
349457cc | 2096 | d_move(old_dentry, new_dentry); |
8fb559f8 CL |
2097 | nfs_set_verifier(new_dentry, |
2098 | nfs_save_change_attribute(new_dir)); | |
d45b9d8b TM |
2099 | } else if (error == -ENOENT) |
2100 | nfs_dentry_handle_enoent(old_dentry); | |
1da177e4 LT |
2101 | |
2102 | /* new dentry created? */ | |
2103 | if (dentry) | |
2104 | dput(dentry); | |
1da177e4 LT |
2105 | return error; |
2106 | } | |
ddda8e0a | 2107 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2108 | |
cfcea3e8 TM |
2109 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2110 | static LIST_HEAD(nfs_access_lru_list); | |
2111 | static atomic_long_t nfs_access_nr_entries; | |
2112 | ||
3a505845 TM |
2113 | static unsigned long nfs_access_max_cachesize = ULONG_MAX; |
2114 | module_param(nfs_access_max_cachesize, ulong, 0644); | |
2115 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2116 | ||
1c3c07e9 TM |
2117 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2118 | { | |
2119 | put_rpccred(entry->cred); | |
f682a398 | 2120 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2121 | smp_mb__before_atomic(); |
cfcea3e8 | 2122 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2123 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2124 | } |
2125 | ||
1a81bb8a TM |
2126 | static void nfs_access_free_list(struct list_head *head) |
2127 | { | |
2128 | struct nfs_access_entry *cache; | |
2129 | ||
2130 | while (!list_empty(head)) { | |
2131 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2132 | list_del(&cache->lru); | |
2133 | nfs_access_free_entry(cache); | |
2134 | } | |
2135 | } | |
2136 | ||
3a505845 TM |
2137 | static unsigned long |
2138 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2139 | { |
2140 | LIST_HEAD(head); | |
aa510da5 | 2141 | struct nfs_inode *nfsi, *next; |
979df72e | 2142 | struct nfs_access_entry *cache; |
1ab6c499 | 2143 | long freed = 0; |
979df72e | 2144 | |
a50f7951 | 2145 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2146 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2147 | struct inode *inode; |
2148 | ||
2149 | if (nr_to_scan-- == 0) | |
2150 | break; | |
9c7e7e23 | 2151 | inode = &nfsi->vfs_inode; |
979df72e TM |
2152 | spin_lock(&inode->i_lock); |
2153 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2154 | goto remove_lru_entry; | |
2155 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2156 | struct nfs_access_entry, lru); | |
2157 | list_move(&cache->lru, &head); | |
2158 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2159 | freed++; |
979df72e TM |
2160 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2161 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2162 | &nfs_access_lru_list); | |
2163 | else { | |
2164 | remove_lru_entry: | |
2165 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2166 | smp_mb__before_atomic(); |
979df72e | 2167 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2168 | smp_mb__after_atomic(); |
979df72e | 2169 | } |
59844a9b | 2170 | spin_unlock(&inode->i_lock); |
979df72e TM |
2171 | } |
2172 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2173 | nfs_access_free_list(&head); |
1ab6c499 DC |
2174 | return freed; |
2175 | } | |
2176 | ||
3a505845 TM |
2177 | unsigned long |
2178 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2179 | { | |
2180 | int nr_to_scan = sc->nr_to_scan; | |
2181 | gfp_t gfp_mask = sc->gfp_mask; | |
2182 | ||
2183 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2184 | return SHRINK_STOP; | |
2185 | return nfs_do_access_cache_scan(nr_to_scan); | |
2186 | } | |
2187 | ||
2188 | ||
1ab6c499 DC |
2189 | unsigned long |
2190 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2191 | { | |
55f841ce | 2192 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2193 | } |
2194 | ||
3a505845 TM |
2195 | static void |
2196 | nfs_access_cache_enforce_limit(void) | |
2197 | { | |
2198 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2199 | unsigned long diff; | |
2200 | unsigned int nr_to_scan; | |
2201 | ||
2202 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2203 | return; | |
2204 | nr_to_scan = 100; | |
2205 | diff = nr_entries - nfs_access_max_cachesize; | |
2206 | if (diff < nr_to_scan) | |
2207 | nr_to_scan = diff; | |
2208 | nfs_do_access_cache_scan(nr_to_scan); | |
2209 | } | |
2210 | ||
1a81bb8a | 2211 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2212 | { |
1c3c07e9 | 2213 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2214 | struct rb_node *n; |
1c3c07e9 TM |
2215 | struct nfs_access_entry *entry; |
2216 | ||
2217 | /* Unhook entries from the cache */ | |
2218 | while ((n = rb_first(root_node)) != NULL) { | |
2219 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2220 | rb_erase(n, root_node); | |
1a81bb8a | 2221 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2222 | } |
2223 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2224 | } |
2225 | ||
1c3c07e9 | 2226 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2227 | { |
1a81bb8a TM |
2228 | LIST_HEAD(head); |
2229 | ||
2230 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2231 | return; | |
cfcea3e8 | 2232 | /* Remove from global LRU init */ |
1a81bb8a TM |
2233 | spin_lock(&nfs_access_lru_lock); |
2234 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2235 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2236 | |
1c3c07e9 | 2237 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2238 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2239 | spin_unlock(&inode->i_lock); | |
2240 | spin_unlock(&nfs_access_lru_lock); | |
2241 | nfs_access_free_list(&head); | |
1c3c07e9 | 2242 | } |
1c606fb7 | 2243 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2244 | |
1c3c07e9 TM |
2245 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2246 | { | |
2247 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2248 | struct nfs_access_entry *entry; | |
2249 | ||
2250 | while (n != NULL) { | |
2251 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2252 | ||
2253 | if (cred < entry->cred) | |
2254 | n = n->rb_left; | |
2255 | else if (cred > entry->cred) | |
2256 | n = n->rb_right; | |
2257 | else | |
2258 | return entry; | |
1da177e4 | 2259 | } |
1c3c07e9 TM |
2260 | return NULL; |
2261 | } | |
2262 | ||
57b69181 | 2263 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res, bool may_block) |
1c3c07e9 TM |
2264 | { |
2265 | struct nfs_inode *nfsi = NFS_I(inode); | |
2266 | struct nfs_access_entry *cache; | |
57b69181 TM |
2267 | bool retry = true; |
2268 | int err; | |
1c3c07e9 | 2269 | |
dc59250c | 2270 | spin_lock(&inode->i_lock); |
57b69181 TM |
2271 | for(;;) { |
2272 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2273 | goto out_zap; | |
2274 | cache = nfs_access_search_rbtree(inode, cred); | |
2275 | err = -ENOENT; | |
2276 | if (cache == NULL) | |
2277 | goto out; | |
2278 | /* Found an entry, is our attribute cache valid? */ | |
2279 | if (!nfs_attribute_cache_expired(inode) && | |
2280 | !(nfsi->cache_validity & NFS_INO_INVALID_ATTR)) | |
2281 | break; | |
2282 | err = -ECHILD; | |
2283 | if (!may_block) | |
2284 | goto out; | |
2285 | if (!retry) | |
2286 | goto out_zap; | |
2287 | spin_unlock(&inode->i_lock); | |
2288 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2289 | if (err) | |
2290 | return err; | |
2291 | spin_lock(&inode->i_lock); | |
2292 | retry = false; | |
2293 | } | |
1c3c07e9 TM |
2294 | res->jiffies = cache->jiffies; |
2295 | res->cred = cache->cred; | |
2296 | res->mask = cache->mask; | |
cfcea3e8 | 2297 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2298 | err = 0; |
2299 | out: | |
2300 | spin_unlock(&inode->i_lock); | |
2301 | return err; | |
1c3c07e9 | 2302 | out_zap: |
1a81bb8a TM |
2303 | spin_unlock(&inode->i_lock); |
2304 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2305 | return -ENOENT; |
2306 | } | |
2307 | ||
f682a398 N |
2308 | static int nfs_access_get_cached_rcu(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
2309 | { | |
2310 | /* Only check the most recently returned cache entry, | |
2311 | * but do it without locking. | |
2312 | */ | |
2313 | struct nfs_inode *nfsi = NFS_I(inode); | |
2314 | struct nfs_access_entry *cache; | |
2315 | int err = -ECHILD; | |
2316 | struct list_head *lh; | |
2317 | ||
2318 | rcu_read_lock(); | |
2319 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2320 | goto out; | |
2321 | lh = rcu_dereference(nfsi->access_cache_entry_lru.prev); | |
2322 | cache = list_entry(lh, struct nfs_access_entry, lru); | |
2323 | if (lh == &nfsi->access_cache_entry_lru || | |
2324 | cred != cache->cred) | |
2325 | cache = NULL; | |
2326 | if (cache == NULL) | |
2327 | goto out; | |
57b69181 TM |
2328 | err = nfs_revalidate_inode_rcu(NFS_SERVER(inode), inode); |
2329 | if (err) | |
f682a398 N |
2330 | goto out; |
2331 | res->jiffies = cache->jiffies; | |
2332 | res->cred = cache->cred; | |
2333 | res->mask = cache->mask; | |
f682a398 N |
2334 | out: |
2335 | rcu_read_unlock(); | |
2336 | return err; | |
2337 | } | |
2338 | ||
1c3c07e9 TM |
2339 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2340 | { | |
cfcea3e8 TM |
2341 | struct nfs_inode *nfsi = NFS_I(inode); |
2342 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2343 | struct rb_node **p = &root_node->rb_node; |
2344 | struct rb_node *parent = NULL; | |
2345 | struct nfs_access_entry *entry; | |
2346 | ||
2347 | spin_lock(&inode->i_lock); | |
2348 | while (*p != NULL) { | |
2349 | parent = *p; | |
2350 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2351 | ||
2352 | if (set->cred < entry->cred) | |
2353 | p = &parent->rb_left; | |
2354 | else if (set->cred > entry->cred) | |
2355 | p = &parent->rb_right; | |
2356 | else | |
2357 | goto found; | |
2358 | } | |
2359 | rb_link_node(&set->rb_node, parent, p); | |
2360 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2361 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2362 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2363 | return; |
2364 | found: | |
2365 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2366 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2367 | list_del(&entry->lru); | |
1c3c07e9 TM |
2368 | spin_unlock(&inode->i_lock); |
2369 | nfs_access_free_entry(entry); | |
2370 | } | |
2371 | ||
6168f62c | 2372 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2373 | { |
2374 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2375 | if (cache == NULL) | |
2376 | return; | |
2377 | RB_CLEAR_NODE(&cache->rb_node); | |
1da177e4 | 2378 | cache->jiffies = set->jiffies; |
1c3c07e9 | 2379 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2380 | cache->mask = set->mask; |
1c3c07e9 | 2381 | |
f682a398 N |
2382 | /* The above field assignments must be visible |
2383 | * before this item appears on the lru. We cannot easily | |
2384 | * use rcu_assign_pointer, so just force the memory barrier. | |
2385 | */ | |
2386 | smp_wmb(); | |
1c3c07e9 | 2387 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2388 | |
2389 | /* Update accounting */ | |
4e857c58 | 2390 | smp_mb__before_atomic(); |
cfcea3e8 | 2391 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2392 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2393 | |
2394 | /* Add inode to global LRU list */ | |
1a81bb8a | 2395 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2396 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2397 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2398 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2399 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2400 | spin_unlock(&nfs_access_lru_lock); |
2401 | } | |
3a505845 | 2402 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2403 | } |
6168f62c WAA |
2404 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2405 | ||
2406 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) | |
2407 | { | |
2408 | entry->mask = 0; | |
2409 | if (access_result & NFS4_ACCESS_READ) | |
2410 | entry->mask |= MAY_READ; | |
2411 | if (access_result & | |
2412 | (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
2413 | entry->mask |= MAY_WRITE; | |
2414 | if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
2415 | entry->mask |= MAY_EXEC; | |
2416 | } | |
2417 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2418 | |
2419 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2420 | { | |
2421 | struct nfs_access_entry cache; | |
57b69181 | 2422 | bool may_block = (mask & MAY_NOT_BLOCK) == 0; |
1da177e4 LT |
2423 | int status; |
2424 | ||
f4ce1299 TM |
2425 | trace_nfs_access_enter(inode); |
2426 | ||
f682a398 N |
2427 | status = nfs_access_get_cached_rcu(inode, cred, &cache); |
2428 | if (status != 0) | |
57b69181 | 2429 | status = nfs_access_get_cached(inode, cred, &cache, may_block); |
1da177e4 | 2430 | if (status == 0) |
f4ce1299 | 2431 | goto out_cached; |
1da177e4 | 2432 | |
f3324a2a | 2433 | status = -ECHILD; |
57b69181 | 2434 | if (!may_block) |
f3324a2a N |
2435 | goto out; |
2436 | ||
1da177e4 LT |
2437 | /* Be clever: ask server to check for all possible rights */ |
2438 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
2439 | cache.cred = cred; | |
2440 | cache.jiffies = jiffies; | |
2441 | status = NFS_PROTO(inode)->access(inode, &cache); | |
a71ee337 SJ |
2442 | if (status != 0) { |
2443 | if (status == -ESTALE) { | |
2444 | nfs_zap_caches(inode); | |
2445 | if (!S_ISDIR(inode->i_mode)) | |
2446 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2447 | } | |
f4ce1299 | 2448 | goto out; |
a71ee337 | 2449 | } |
1da177e4 | 2450 | nfs_access_add_cache(inode, &cache); |
f4ce1299 TM |
2451 | out_cached: |
2452 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) | |
2453 | status = -EACCES; | |
1da177e4 | 2454 | out: |
f4ce1299 TM |
2455 | trace_nfs_access_exit(inode, status); |
2456 | return status; | |
1da177e4 LT |
2457 | } |
2458 | ||
af22f94a TM |
2459 | static int nfs_open_permission_mask(int openflags) |
2460 | { | |
2461 | int mask = 0; | |
2462 | ||
f8d9a897 WAA |
2463 | if (openflags & __FMODE_EXEC) { |
2464 | /* ONLY check exec rights */ | |
2465 | mask = MAY_EXEC; | |
2466 | } else { | |
2467 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2468 | mask |= MAY_READ; | |
2469 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2470 | mask |= MAY_WRITE; | |
2471 | } | |
2472 | ||
af22f94a TM |
2473 | return mask; |
2474 | } | |
2475 | ||
2476 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2477 | { | |
2478 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2479 | } | |
89d77c8f | 2480 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2481 | |
5c5fc09a TM |
2482 | static int nfs_execute_ok(struct inode *inode, int mask) |
2483 | { | |
2484 | struct nfs_server *server = NFS_SERVER(inode); | |
2485 | int ret; | |
2486 | ||
2487 | if (mask & MAY_NOT_BLOCK) | |
2488 | ret = nfs_revalidate_inode_rcu(server, inode); | |
2489 | else | |
2490 | ret = nfs_revalidate_inode(server, inode); | |
2491 | if (ret == 0 && !execute_ok(inode)) | |
2492 | ret = -EACCES; | |
2493 | return ret; | |
2494 | } | |
2495 | ||
10556cb2 | 2496 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2497 | { |
2498 | struct rpc_cred *cred; | |
2499 | int res = 0; | |
2500 | ||
91d5b470 CL |
2501 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2502 | ||
e6305c43 | 2503 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2504 | goto out; |
2505 | /* Is this sys_access() ? */ | |
9cfcac81 | 2506 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2507 | goto force_lookup; |
2508 | ||
2509 | switch (inode->i_mode & S_IFMT) { | |
2510 | case S_IFLNK: | |
2511 | goto out; | |
2512 | case S_IFREG: | |
762674f8 TM |
2513 | if ((mask & MAY_OPEN) && |
2514 | nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) | |
2515 | return 0; | |
1da177e4 LT |
2516 | break; |
2517 | case S_IFDIR: | |
2518 | /* | |
2519 | * Optimize away all write operations, since the server | |
2520 | * will check permissions when we perform the op. | |
2521 | */ | |
2522 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2523 | goto out; | |
2524 | } | |
2525 | ||
2526 | force_lookup: | |
1da177e4 LT |
2527 | if (!NFS_PROTO(inode)->access) |
2528 | goto out_notsup; | |
2529 | ||
f3324a2a N |
2530 | /* Always try fast lookups first */ |
2531 | rcu_read_lock(); | |
2532 | cred = rpc_lookup_cred_nonblock(); | |
2533 | if (!IS_ERR(cred)) | |
2534 | res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK); | |
2535 | else | |
1da177e4 | 2536 | res = PTR_ERR(cred); |
f3324a2a N |
2537 | rcu_read_unlock(); |
2538 | if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) { | |
2539 | /* Fast lookup failed, try the slow way */ | |
2540 | cred = rpc_lookup_cred(); | |
2541 | if (!IS_ERR(cred)) { | |
2542 | res = nfs_do_access(inode, cred, mask); | |
2543 | put_rpccred(cred); | |
2544 | } else | |
2545 | res = PTR_ERR(cred); | |
2546 | } | |
1da177e4 | 2547 | out: |
5c5fc09a TM |
2548 | if (!res && (mask & MAY_EXEC)) |
2549 | res = nfs_execute_ok(inode, mask); | |
f696a365 | 2550 | |
1e8968c5 | 2551 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2552 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2553 | return res; |
2554 | out_notsup: | |
d51ac1a8 N |
2555 | if (mask & MAY_NOT_BLOCK) |
2556 | return -ECHILD; | |
2557 | ||
1da177e4 LT |
2558 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
2559 | if (res == 0) | |
2830ba7f | 2560 | res = generic_permission(inode, mask); |
1e7cb3dc | 2561 | goto out; |
1da177e4 | 2562 | } |
ddda8e0a | 2563 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2564 | |
2565 | /* | |
2566 | * Local variables: | |
2567 | * version-control: t | |
2568 | * kept-new-versions: 5 | |
2569 | * End: | |
2570 | */ |