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Commit | Line | Data |
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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, |
b044f645 | 60 | .iterate = nfs_readdir, |
1da177e4 | 61 | .open = nfs_opendir, |
480c2006 | 62 | .release = nfs_closedir, |
1da177e4 LT |
63 | .fsync = nfs_fsync_dir, |
64 | }; | |
65 | ||
11de3b11 TM |
66 | const struct address_space_operations nfs_dir_aops = { |
67 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
68 | }; |
69 | ||
0c030806 | 70 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
480c2006 | 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 { | |
88b8e133 | 148 | int size; |
d1bacf9e BS |
149 | int eof_index; |
150 | u64 last_cookie; | |
151 | struct nfs_cache_array_entry array[0]; | |
152 | }; | |
153 | ||
a7a3b1e9 | 154 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, bool); |
1da177e4 LT |
155 | typedef struct { |
156 | struct file *file; | |
157 | struct page *page; | |
23db8620 | 158 | struct dir_context *ctx; |
1da177e4 | 159 | unsigned long page_index; |
f0dd2136 | 160 | u64 *dir_cookie; |
0aded708 | 161 | u64 last_cookie; |
f0dd2136 | 162 | loff_t current_index; |
1da177e4 | 163 | decode_dirent_t decode; |
d1bacf9e | 164 | |
1f4eab7e | 165 | unsigned long timestamp; |
4704f0e2 | 166 | unsigned long gencount; |
d1bacf9e | 167 | unsigned int cache_entry_index; |
a7a3b1e9 BC |
168 | bool plus; |
169 | bool eof; | |
1da177e4 LT |
170 | } nfs_readdir_descriptor_t; |
171 | ||
d1bacf9e BS |
172 | /* |
173 | * we are freeing strings created by nfs_add_to_readdir_array() | |
174 | */ | |
175 | static | |
11de3b11 | 176 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 177 | { |
11de3b11 | 178 | struct nfs_cache_array *array; |
d1bacf9e | 179 | int i; |
8cd51a0c | 180 | |
2b86ce2d | 181 | array = kmap_atomic(page); |
b044f645 BC |
182 | for (i = 0; i < array->size; i++) |
183 | kfree(array->array[i].string.name); | |
2b86ce2d | 184 | kunmap_atomic(array); |
d1bacf9e BS |
185 | } |
186 | ||
187 | /* | |
188 | * the caller is responsible for freeing qstr.name | |
189 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
190 | * nfs_clear_readdir_array() | |
191 | */ | |
192 | static | |
4a201d6e | 193 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
194 | { |
195 | string->len = len; | |
196 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
197 | if (string->name == NULL) |
198 | return -ENOMEM; | |
04e4bd1c CM |
199 | /* |
200 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
201 | * in a page cache page which kmemleak does not scan. | |
202 | */ | |
203 | kmemleak_not_leak(string->name); | |
8387ff25 | 204 | string->hash = full_name_hash(NULL, name, len); |
4a201d6e | 205 | return 0; |
d1bacf9e BS |
206 | } |
207 | ||
208 | static | |
209 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
210 | { | |
0795bf83 | 211 | struct nfs_cache_array *array = kmap(page); |
4a201d6e TM |
212 | struct nfs_cache_array_entry *cache_entry; |
213 | int ret; | |
214 | ||
3020093f TM |
215 | cache_entry = &array->array[array->size]; |
216 | ||
217 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 218 | ret = -ENOSPC; |
3020093f | 219 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 220 | goto out; |
d1bacf9e | 221 | |
4a201d6e TM |
222 | cache_entry->cookie = entry->prev_cookie; |
223 | cache_entry->ino = entry->ino; | |
0b26a0bf | 224 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
225 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
226 | if (ret) | |
227 | goto out; | |
d1bacf9e | 228 | array->last_cookie = entry->cookie; |
8cd51a0c | 229 | array->size++; |
47c716cb | 230 | if (entry->eof != 0) |
d1bacf9e | 231 | array->eof_index = array->size; |
4a201d6e | 232 | out: |
0795bf83 | 233 | kunmap(page); |
4a201d6e | 234 | return ret; |
d1bacf9e BS |
235 | } |
236 | ||
237 | static | |
238 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
239 | { | |
23db8620 | 240 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
241 | unsigned int index; |
242 | ||
243 | if (diff < 0) | |
244 | goto out_eof; | |
245 | if (diff >= array->size) { | |
8cd51a0c | 246 | if (array->eof_index >= 0) |
d1bacf9e | 247 | goto out_eof; |
d1bacf9e BS |
248 | return -EAGAIN; |
249 | } | |
250 | ||
251 | index = (unsigned int)diff; | |
252 | *desc->dir_cookie = array->array[index].cookie; | |
253 | desc->cache_entry_index = index; | |
d1bacf9e BS |
254 | return 0; |
255 | out_eof: | |
256 | desc->eof = 1; | |
257 | return -EBADCOOKIE; | |
258 | } | |
259 | ||
4db72b40 JL |
260 | static bool |
261 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
262 | { | |
263 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
264 | return false; | |
265 | smp_rmb(); | |
266 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
267 | } | |
268 | ||
d1bacf9e BS |
269 | static |
270 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
271 | { | |
272 | int i; | |
8ef2ce3e | 273 | loff_t new_pos; |
d1bacf9e BS |
274 | int status = -EAGAIN; |
275 | ||
276 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 277 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 278 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
279 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
280 | ||
8ef2ce3e | 281 | new_pos = desc->current_index + i; |
4db72b40 JL |
282 | if (ctx->attr_gencount != nfsi->attr_gencount || |
283 | !nfs_readdir_inode_mapping_valid(nfsi)) { | |
0c030806 TM |
284 | ctx->duped = 0; |
285 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 286 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
287 | if (ctx->duped > 0 |
288 | && ctx->dup_cookie == *desc->dir_cookie) { | |
289 | if (printk_ratelimit()) { | |
6de1472f | 290 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 291 | "Please contact your server vendor. " |
9581a4ae JL |
292 | "The file: %.*s has duplicate cookie %llu\n", |
293 | desc->file, array->array[i].string.len, | |
294 | array->array[i].string.name, *desc->dir_cookie); | |
0c030806 TM |
295 | } |
296 | status = -ELOOP; | |
297 | goto out; | |
298 | } | |
8ef2ce3e | 299 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 300 | ctx->duped = -1; |
8ef2ce3e | 301 | } |
23db8620 | 302 | desc->ctx->pos = new_pos; |
d1bacf9e | 303 | desc->cache_entry_index = i; |
47c716cb | 304 | return 0; |
d1bacf9e BS |
305 | } |
306 | } | |
47c716cb | 307 | if (array->eof_index >= 0) { |
8cd51a0c | 308 | status = -EBADCOOKIE; |
18fb5fe4 TM |
309 | if (*desc->dir_cookie == array->last_cookie) |
310 | desc->eof = 1; | |
8cd51a0c | 311 | } |
0c030806 | 312 | out: |
d1bacf9e BS |
313 | return status; |
314 | } | |
315 | ||
316 | static | |
317 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
318 | { | |
319 | struct nfs_cache_array *array; | |
47c716cb | 320 | int status; |
d1bacf9e | 321 | |
0795bf83 | 322 | array = kmap(desc->page); |
d1bacf9e BS |
323 | |
324 | if (*desc->dir_cookie == 0) | |
325 | status = nfs_readdir_search_for_pos(array, desc); | |
326 | else | |
327 | status = nfs_readdir_search_for_cookie(array, desc); | |
328 | ||
47c716cb | 329 | if (status == -EAGAIN) { |
0aded708 | 330 | desc->last_cookie = array->last_cookie; |
e47c085a | 331 | desc->current_index += array->size; |
47c716cb TM |
332 | desc->page_index++; |
333 | } | |
0795bf83 | 334 | kunmap(desc->page); |
d1bacf9e BS |
335 | return status; |
336 | } | |
337 | ||
338 | /* Fill a page with xdr information before transferring to the cache page */ | |
339 | static | |
56e4ebf8 | 340 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 341 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 342 | { |
480c2006 BS |
343 | struct nfs_open_dir_context *ctx = file->private_data; |
344 | struct rpc_cred *cred = ctx->cred; | |
4704f0e2 | 345 | unsigned long timestamp, gencount; |
1da177e4 LT |
346 | int error; |
347 | ||
1da177e4 LT |
348 | again: |
349 | timestamp = jiffies; | |
4704f0e2 | 350 | gencount = nfs_inc_attr_generation_counter(); |
be62a1a8 | 351 | error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages, |
1da177e4 LT |
352 | NFS_SERVER(inode)->dtsize, desc->plus); |
353 | if (error < 0) { | |
354 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
355 | if (error == -ENOTSUPP && desc->plus) { | |
356 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 357 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
a7a3b1e9 | 358 | desc->plus = false; |
1da177e4 LT |
359 | goto again; |
360 | } | |
361 | goto error; | |
362 | } | |
1f4eab7e | 363 | desc->timestamp = timestamp; |
4704f0e2 | 364 | desc->gencount = gencount; |
d1bacf9e BS |
365 | error: |
366 | return error; | |
1da177e4 LT |
367 | } |
368 | ||
573c4e1e CL |
369 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
370 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 371 | { |
573c4e1e | 372 | int error; |
1da177e4 | 373 | |
573c4e1e CL |
374 | error = desc->decode(xdr, entry, desc->plus); |
375 | if (error) | |
376 | return error; | |
d1bacf9e BS |
377 | entry->fattr->time_start = desc->timestamp; |
378 | entry->fattr->gencount = desc->gencount; | |
379 | return 0; | |
1da177e4 LT |
380 | } |
381 | ||
fa923369 TM |
382 | /* Match file and dirent using either filehandle or fileid |
383 | * Note: caller is responsible for checking the fsid | |
384 | */ | |
d39ab9de BS |
385 | static |
386 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
387 | { | |
d8fdb47f | 388 | struct inode *inode; |
fa923369 TM |
389 | struct nfs_inode *nfsi; |
390 | ||
2b0143b5 DH |
391 | if (d_really_is_negative(dentry)) |
392 | return 0; | |
fa923369 | 393 | |
d8fdb47f TM |
394 | inode = d_inode(dentry); |
395 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
396 | return 0; | |
397 | ||
398 | nfsi = NFS_I(inode); | |
7dc72d5f TM |
399 | if (entry->fattr->fileid != nfsi->fileid) |
400 | return 0; | |
401 | if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) | |
402 | return 0; | |
403 | return 1; | |
d39ab9de BS |
404 | } |
405 | ||
d69ee9b8 | 406 | static |
23db8620 | 407 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
408 | { |
409 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
410 | return false; | |
411 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
412 | return true; | |
23db8620 | 413 | if (ctx->pos == 0) |
d69ee9b8 TM |
414 | return true; |
415 | return false; | |
416 | } | |
417 | ||
418 | /* | |
63519fbc TM |
419 | * This function is called by the lookup and getattr code to request the |
420 | * use of readdirplus to accelerate any future lookups in the same | |
d69ee9b8 TM |
421 | * directory. |
422 | */ | |
d69ee9b8 TM |
423 | void nfs_advise_use_readdirplus(struct inode *dir) |
424 | { | |
63519fbc TM |
425 | struct nfs_inode *nfsi = NFS_I(dir); |
426 | ||
427 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
428 | !list_empty(&nfsi->open_files)) | |
429 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
d69ee9b8 TM |
430 | } |
431 | ||
311324ad TM |
432 | /* |
433 | * This function is mainly for use by nfs_getattr(). | |
434 | * | |
435 | * If this is an 'ls -l', we want to force use of readdirplus. | |
436 | * Do this by checking if there is an active file descriptor | |
437 | * and calling nfs_advise_use_readdirplus, then forcing a | |
438 | * cache flush. | |
439 | */ | |
440 | void nfs_force_use_readdirplus(struct inode *dir) | |
441 | { | |
63519fbc TM |
442 | struct nfs_inode *nfsi = NFS_I(dir); |
443 | ||
444 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
445 | !list_empty(&nfsi->open_files)) { | |
446 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
79f687a3 | 447 | invalidate_mapping_pages(dir->i_mapping, 0, -1); |
311324ad TM |
448 | } |
449 | } | |
450 | ||
d39ab9de BS |
451 | static |
452 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
453 | { | |
26fe5750 | 454 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
9ac3d3e8 | 455 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
4a201d6e TM |
456 | struct dentry *dentry; |
457 | struct dentry *alias; | |
2b0143b5 | 458 | struct inode *dir = d_inode(parent); |
d39ab9de | 459 | struct inode *inode; |
aa9c2669 | 460 | int status; |
d39ab9de | 461 | |
fa923369 TM |
462 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) |
463 | return; | |
6c441c25 TM |
464 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
465 | return; | |
78d04af4 TM |
466 | if (filename.len == 0) |
467 | return; | |
468 | /* Validate that the name doesn't contain any illegal '\0' */ | |
469 | if (strnlen(filename.name, filename.len) != filename.len) | |
470 | return; | |
471 | /* ...or '/' */ | |
472 | if (strnchr(filename.name, filename.len, '/')) | |
473 | return; | |
4a201d6e TM |
474 | if (filename.name[0] == '.') { |
475 | if (filename.len == 1) | |
476 | return; | |
477 | if (filename.len == 2 && filename.name[1] == '.') | |
478 | return; | |
479 | } | |
8387ff25 | 480 | filename.hash = full_name_hash(parent, filename.name, filename.len); |
d39ab9de | 481 | |
4a201d6e | 482 | dentry = d_lookup(parent, &filename); |
9ac3d3e8 AV |
483 | again: |
484 | if (!dentry) { | |
485 | dentry = d_alloc_parallel(parent, &filename, &wq); | |
486 | if (IS_ERR(dentry)) | |
487 | return; | |
488 | } | |
489 | if (!d_in_lookup(dentry)) { | |
6c441c25 TM |
490 | /* Is there a mountpoint here? If so, just exit */ |
491 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
492 | &entry->fattr->fsid)) | |
493 | goto out; | |
d39ab9de | 494 | if (nfs_same_file(dentry, entry)) { |
7dc72d5f TM |
495 | if (!entry->fh->size) |
496 | goto out; | |
cda57a1e | 497 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
2b0143b5 | 498 | status = nfs_refresh_inode(d_inode(dentry), entry->fattr); |
aa9c2669 | 499 | if (!status) |
2b0143b5 | 500 | nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); |
d39ab9de BS |
501 | goto out; |
502 | } else { | |
5542aa2f | 503 | d_invalidate(dentry); |
d39ab9de | 504 | dput(dentry); |
9ac3d3e8 AV |
505 | dentry = NULL; |
506 | goto again; | |
d39ab9de BS |
507 | } |
508 | } | |
7dc72d5f TM |
509 | if (!entry->fh->size) { |
510 | d_lookup_done(dentry); | |
511 | goto out; | |
512 | } | |
d39ab9de | 513 | |
1775fd3e | 514 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
41d28bca | 515 | alias = d_splice_alias(inode, dentry); |
9ac3d3e8 AV |
516 | d_lookup_done(dentry); |
517 | if (alias) { | |
518 | if (IS_ERR(alias)) | |
519 | goto out; | |
520 | dput(dentry); | |
521 | dentry = alias; | |
522 | } | |
523 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
d39ab9de BS |
524 | out: |
525 | dput(dentry); | |
d39ab9de BS |
526 | } |
527 | ||
d1bacf9e BS |
528 | /* Perform conversion from xdr to cache array */ |
529 | static | |
8cd51a0c | 530 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 531 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 532 | { |
babddc72 | 533 | struct xdr_stream stream; |
f7da7a12 | 534 | struct xdr_buf buf; |
6650239a | 535 | struct page *scratch; |
99424380 | 536 | struct nfs_cache_array *array; |
5c346854 TM |
537 | unsigned int count = 0; |
538 | int status; | |
babddc72 | 539 | |
6650239a TM |
540 | scratch = alloc_page(GFP_KERNEL); |
541 | if (scratch == NULL) | |
542 | return -ENOMEM; | |
babddc72 | 543 | |
ce85cfbe BC |
544 | if (buflen == 0) |
545 | goto out_nopages; | |
546 | ||
f7da7a12 | 547 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
6650239a | 548 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
99424380 BS |
549 | |
550 | do { | |
551 | status = xdr_decode(desc, entry, &stream); | |
8cd51a0c TM |
552 | if (status != 0) { |
553 | if (status == -EAGAIN) | |
554 | status = 0; | |
99424380 | 555 | break; |
8cd51a0c | 556 | } |
99424380 | 557 | |
5c346854 TM |
558 | count++; |
559 | ||
a7a3b1e9 | 560 | if (desc->plus) |
be62a1a8 | 561 | nfs_prime_dcache(file_dentry(desc->file), entry); |
8cd51a0c TM |
562 | |
563 | status = nfs_readdir_add_to_array(entry, page); | |
564 | if (status != 0) | |
565 | break; | |
99424380 BS |
566 | } while (!entry->eof); |
567 | ||
ce85cfbe | 568 | out_nopages: |
47c716cb | 569 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
0795bf83 FF |
570 | array = kmap(page); |
571 | array->eof_index = array->size; | |
572 | status = 0; | |
573 | kunmap(page); | |
1da177e4 | 574 | } |
6650239a TM |
575 | |
576 | put_page(scratch); | |
8cd51a0c | 577 | return status; |
56e4ebf8 BS |
578 | } |
579 | ||
580 | static | |
c7e9668e | 581 | void nfs_readdir_free_pages(struct page **pages, unsigned int npages) |
56e4ebf8 BS |
582 | { |
583 | unsigned int i; | |
584 | for (i = 0; i < npages; i++) | |
585 | put_page(pages[i]); | |
586 | } | |
587 | ||
56e4ebf8 BS |
588 | /* |
589 | * nfs_readdir_large_page will allocate pages that must be freed with a call | |
0b936e37 | 590 | * to nfs_readdir_free_pagearray |
56e4ebf8 BS |
591 | */ |
592 | static | |
c7e9668e | 593 | int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages) |
56e4ebf8 | 594 | { |
56e4ebf8 BS |
595 | unsigned int i; |
596 | ||
597 | for (i = 0; i < npages; i++) { | |
598 | struct page *page = alloc_page(GFP_KERNEL); | |
599 | if (page == NULL) | |
600 | goto out_freepages; | |
601 | pages[i] = page; | |
602 | } | |
6650239a | 603 | return 0; |
56e4ebf8 | 604 | |
56e4ebf8 | 605 | out_freepages: |
c7e9668e | 606 | nfs_readdir_free_pages(pages, i); |
6650239a | 607 | return -ENOMEM; |
1da177e4 LT |
608 | } |
609 | ||
d1bacf9e BS |
610 | static |
611 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 612 | { |
56e4ebf8 | 613 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
d1bacf9e BS |
614 | struct nfs_entry entry; |
615 | struct file *file = desc->file; | |
616 | struct nfs_cache_array *array; | |
8cd51a0c | 617 | int status = -ENOMEM; |
56e4ebf8 | 618 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e BS |
619 | |
620 | entry.prev_cookie = 0; | |
0aded708 | 621 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
622 | entry.eof = 0; |
623 | entry.fh = nfs_alloc_fhandle(); | |
624 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 625 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
626 | if (entry.fh == NULL || entry.fattr == NULL) |
627 | goto out; | |
00a92642 | 628 | |
14c43f76 DQ |
629 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
630 | if (IS_ERR(entry.label)) { | |
631 | status = PTR_ERR(entry.label); | |
632 | goto out; | |
633 | } | |
634 | ||
0795bf83 | 635 | array = kmap(page); |
d1bacf9e BS |
636 | memset(array, 0, sizeof(struct nfs_cache_array)); |
637 | array->eof_index = -1; | |
00a92642 | 638 | |
c7e9668e | 639 | status = nfs_readdir_alloc_pages(pages, array_size); |
6650239a | 640 | if (status < 0) |
d1bacf9e BS |
641 | goto out_release_array; |
642 | do { | |
ac396128 | 643 | unsigned int pglen; |
56e4ebf8 | 644 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 645 | |
d1bacf9e | 646 | if (status < 0) |
00a92642 | 647 | break; |
ac396128 | 648 | pglen = status; |
6650239a | 649 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
650 | if (status < 0) { |
651 | if (status == -ENOSPC) | |
652 | status = 0; | |
653 | break; | |
654 | } | |
655 | } while (array->eof_index < 0); | |
d1bacf9e | 656 | |
c7e9668e | 657 | nfs_readdir_free_pages(pages, array_size); |
d1bacf9e | 658 | out_release_array: |
0795bf83 | 659 | kunmap(page); |
14c43f76 | 660 | nfs4_label_free(entry.label); |
d1bacf9e BS |
661 | out: |
662 | nfs_free_fattr(entry.fattr); | |
663 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
664 | return status; |
665 | } | |
666 | ||
667 | /* | |
d1bacf9e BS |
668 | * Now we cache directories properly, by converting xdr information |
669 | * to an array that can be used for lookups later. This results in | |
670 | * fewer cache pages, since we can store more information on each page. | |
671 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 672 | */ |
d1bacf9e BS |
673 | static |
674 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) | |
1da177e4 | 675 | { |
496ad9aa | 676 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 677 | int ret; |
1da177e4 | 678 | |
8cd51a0c TM |
679 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
680 | if (ret < 0) | |
d1bacf9e BS |
681 | goto error; |
682 | SetPageUptodate(page); | |
1da177e4 | 683 | |
d1bacf9e BS |
684 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
685 | /* Should never happen */ | |
686 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 687 | } |
d1bacf9e BS |
688 | unlock_page(page); |
689 | return 0; | |
690 | error: | |
691 | unlock_page(page); | |
8cd51a0c | 692 | return ret; |
d1bacf9e | 693 | } |
1da177e4 | 694 | |
d1bacf9e BS |
695 | static |
696 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
697 | { | |
b044f645 BC |
698 | if (!desc->page->mapping) |
699 | nfs_readdir_clear_array(desc->page); | |
09cbfeaf | 700 | put_page(desc->page); |
d1bacf9e BS |
701 | desc->page = NULL; |
702 | } | |
703 | ||
704 | static | |
705 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
706 | { | |
b044f645 | 707 | return read_cache_page(desc->file->f_mapping, |
d1bacf9e | 708 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
1da177e4 LT |
709 | } |
710 | ||
711 | /* | |
d1bacf9e | 712 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 713 | */ |
d1bacf9e BS |
714 | static |
715 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
716 | { | |
717 | int res; | |
718 | ||
719 | desc->page = get_cache_page(desc); | |
720 | if (IS_ERR(desc->page)) | |
721 | return PTR_ERR(desc->page); | |
722 | ||
723 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
724 | if (res != 0) |
725 | cache_page_release(desc); | |
d1bacf9e BS |
726 | return res; |
727 | } | |
728 | ||
729 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
730 | static inline |
731 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
732 | { | |
8cd51a0c | 733 | int res; |
d1bacf9e | 734 | |
0aded708 | 735 | if (desc->page_index == 0) { |
8cd51a0c | 736 | desc->current_index = 0; |
0aded708 TM |
737 | desc->last_cookie = 0; |
738 | } | |
47c716cb | 739 | do { |
d1bacf9e | 740 | res = find_cache_page(desc); |
47c716cb | 741 | } while (res == -EAGAIN); |
1da177e4 LT |
742 | return res; |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Once we've found the start of the dirent within a page: fill 'er up... | |
747 | */ | |
748 | static | |
23db8620 | 749 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
750 | { |
751 | struct file *file = desc->file; | |
d1bacf9e BS |
752 | int i = 0; |
753 | int res = 0; | |
754 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
755 | struct nfs_open_dir_context *ctx = file->private_data; |
756 | ||
0795bf83 | 757 | array = kmap(desc->page); |
d1bacf9e | 758 | for (i = desc->cache_entry_index; i < array->size; i++) { |
ece0b423 | 759 | struct nfs_cache_array_entry *ent; |
1da177e4 | 760 | |
ece0b423 | 761 | ent = &array->array[i]; |
23db8620 AV |
762 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
763 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
ece0b423 | 764 | desc->eof = 1; |
1da177e4 | 765 | break; |
ece0b423 | 766 | } |
23db8620 | 767 | desc->ctx->pos++; |
d1bacf9e BS |
768 | if (i < (array->size-1)) |
769 | *desc->dir_cookie = array->array[i+1].cookie; | |
770 | else | |
771 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
772 | if (ctx->duped != 0) |
773 | ctx->duped = 1; | |
1da177e4 | 774 | } |
47c716cb | 775 | if (array->eof_index >= 0) |
8cd51a0c | 776 | desc->eof = 1; |
d1bacf9e | 777 | |
0795bf83 | 778 | kunmap(desc->page); |
d1bacf9e | 779 | cache_page_release(desc); |
1e7cb3dc CL |
780 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
781 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
782 | return res; |
783 | } | |
784 | ||
785 | /* | |
786 | * If we cannot find a cookie in our cache, we suspect that this is | |
787 | * because it points to a deleted file, so we ask the server to return | |
788 | * whatever it thinks is the next entry. We then feed this to filldir. | |
789 | * If all goes well, we should then be able to find our way round the | |
790 | * cache on the next call to readdir_search_pagecache(); | |
791 | * | |
792 | * NOTE: we cannot add the anonymous page to the pagecache because | |
793 | * the data it contains might not be page aligned. Besides, | |
794 | * we should already have a complete representation of the | |
795 | * directory in the page cache by the time we get here. | |
796 | */ | |
797 | static inline | |
23db8620 | 798 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 799 | { |
1da177e4 LT |
800 | struct page *page = NULL; |
801 | int status; | |
496ad9aa | 802 | struct inode *inode = file_inode(desc->file); |
0c030806 | 803 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 804 | |
1e7cb3dc CL |
805 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
806 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
807 | |
808 | page = alloc_page(GFP_HIGHUSER); | |
809 | if (!page) { | |
810 | status = -ENOMEM; | |
811 | goto out; | |
812 | } | |
d1bacf9e | 813 | |
7a8e1dc3 | 814 | desc->page_index = 0; |
0aded708 | 815 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 816 | desc->page = page; |
0c030806 | 817 | ctx->duped = 0; |
7a8e1dc3 | 818 | |
85f8607e TM |
819 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
820 | if (status < 0) | |
1da177e4 LT |
821 | goto out_release; |
822 | ||
23db8620 | 823 | status = nfs_do_filldir(desc); |
1da177e4 | 824 | |
1da177e4 | 825 | out: |
1e7cb3dc | 826 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 827 | __func__, status); |
1da177e4 LT |
828 | return status; |
829 | out_release: | |
d1bacf9e | 830 | cache_page_release(desc); |
1da177e4 LT |
831 | goto out; |
832 | } | |
833 | ||
00a92642 OG |
834 | /* The file offset position represents the dirent entry number. A |
835 | last cookie cache takes care of the common case of reading the | |
836 | whole directory. | |
1da177e4 | 837 | */ |
23db8620 | 838 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 839 | { |
be62a1a8 | 840 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 841 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
842 | nfs_readdir_descriptor_t my_desc, |
843 | *desc = &my_desc; | |
23db8620 | 844 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 845 | int res = 0; |
1da177e4 | 846 | |
6de1472f AV |
847 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
848 | file, (long long)ctx->pos); | |
91d5b470 CL |
849 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
850 | ||
1da177e4 | 851 | /* |
23db8620 | 852 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 853 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
854 | * to either find the entry with the appropriate number or |
855 | * revalidate the cookie. | |
1da177e4 LT |
856 | */ |
857 | memset(desc, 0, sizeof(*desc)); | |
858 | ||
23db8620 AV |
859 | desc->file = file; |
860 | desc->ctx = ctx; | |
480c2006 | 861 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 862 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
a7a3b1e9 | 863 | desc->plus = nfs_use_readdirplus(inode, ctx); |
1da177e4 | 864 | |
79f687a3 | 865 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) |
07b5ce8e | 866 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
fccca7fc TM |
867 | if (res < 0) |
868 | goto out; | |
869 | ||
47c716cb | 870 | do { |
1da177e4 | 871 | res = readdir_search_pagecache(desc); |
00a92642 | 872 | |
1da177e4 | 873 | if (res == -EBADCOOKIE) { |
ece0b423 | 874 | res = 0; |
1da177e4 | 875 | /* This means either end of directory */ |
d1bacf9e | 876 | if (*desc->dir_cookie && desc->eof == 0) { |
1da177e4 | 877 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 878 | res = uncached_readdir(desc); |
ece0b423 | 879 | if (res == 0) |
1da177e4 LT |
880 | continue; |
881 | } | |
1da177e4 LT |
882 | break; |
883 | } | |
884 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 885 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 886 | nfs_zap_caches(inode); |
baf57a09 | 887 | desc->page_index = 0; |
a7a3b1e9 BC |
888 | desc->plus = false; |
889 | desc->eof = false; | |
1da177e4 LT |
890 | continue; |
891 | } | |
892 | if (res < 0) | |
893 | break; | |
894 | ||
23db8620 | 895 | res = nfs_do_filldir(desc); |
ece0b423 | 896 | if (res < 0) |
1da177e4 | 897 | break; |
47c716cb | 898 | } while (!desc->eof); |
fccca7fc | 899 | out: |
1e7cb3dc CL |
900 | if (res > 0) |
901 | res = 0; | |
6de1472f | 902 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 903 | return res; |
1da177e4 LT |
904 | } |
905 | ||
965c8e59 | 906 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 907 | { |
b044f645 | 908 | struct inode *inode = file_inode(filp); |
480c2006 | 909 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 910 | |
6de1472f AV |
911 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
912 | filp, offset, whence); | |
b84e06c5 | 913 | |
b044f645 | 914 | inode_lock(inode); |
965c8e59 | 915 | switch (whence) { |
f0dd2136 TM |
916 | case 1: |
917 | offset += filp->f_pos; | |
918 | case 0: | |
919 | if (offset >= 0) | |
920 | break; | |
921 | default: | |
b044f645 BC |
922 | offset = -EINVAL; |
923 | goto out; | |
f0dd2136 TM |
924 | } |
925 | if (offset != filp->f_pos) { | |
926 | filp->f_pos = offset; | |
480c2006 | 927 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 928 | dir_ctx->duped = 0; |
f0dd2136 | 929 | } |
b044f645 BC |
930 | out: |
931 | inode_unlock(inode); | |
f0dd2136 TM |
932 | return offset; |
933 | } | |
934 | ||
1da177e4 LT |
935 | /* |
936 | * All directory operations under NFS are synchronous, so fsync() | |
937 | * is a dummy operation. | |
938 | */ | |
02c24a82 JB |
939 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
940 | int datasync) | |
1da177e4 | 941 | { |
6de1472f | 942 | struct inode *inode = file_inode(filp); |
7ea80859 | 943 | |
6de1472f | 944 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 945 | |
5955102c | 946 | inode_lock(inode); |
6de1472f | 947 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
5955102c | 948 | inode_unlock(inode); |
1da177e4 LT |
949 | return 0; |
950 | } | |
951 | ||
bfc69a45 TM |
952 | /** |
953 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
954 | * @dir - pointer to directory inode | |
955 | * | |
956 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
957 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
958 | * on the server that might have invalidated our dcache. | |
959 | * | |
960 | * The caller should be holding dir->i_lock | |
961 | */ | |
962 | void nfs_force_lookup_revalidate(struct inode *dir) | |
963 | { | |
011935a0 | 964 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 965 | } |
89d77c8f | 966 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 967 | |
1da177e4 LT |
968 | /* |
969 | * A check for whether or not the parent directory has changed. | |
970 | * In the case it has, we assume that the dentries are untrustworthy | |
971 | * and may need to be looked up again. | |
912a108d | 972 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 973 | */ |
912a108d N |
974 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
975 | int rcu_walk) | |
1da177e4 LT |
976 | { |
977 | if (IS_ROOT(dentry)) | |
978 | return 1; | |
4eec952e TM |
979 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
980 | return 0; | |
f2c77f4e TM |
981 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
982 | return 0; | |
983 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1cd9cb05 TM |
984 | if (nfs_mapping_need_revalidate_inode(dir)) { |
985 | if (rcu_walk) | |
986 | return 0; | |
987 | if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
988 | return 0; | |
989 | } | |
f2c77f4e TM |
990 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
991 | return 0; | |
992 | return 1; | |
1da177e4 LT |
993 | } |
994 | ||
a12802ca TM |
995 | /* |
996 | * Use intent information to check whether or not we're going to do | |
997 | * an O_EXCL create using this path component. | |
998 | */ | |
fa3c56bb | 999 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1000 | { |
1001 | if (NFS_PROTO(dir)->version == 2) | |
1002 | return 0; | |
fa3c56bb | 1003 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1004 | } |
1005 | ||
1d6757fb TM |
1006 | /* |
1007 | * Inode and filehandle revalidation for lookups. | |
1008 | * | |
1009 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1010 | * or if the intent information indicates that we're about to open this | |
1011 | * particular file and the "nocto" mount flag is not set. | |
1012 | * | |
1013 | */ | |
65a0c149 | 1014 | static |
fa3c56bb | 1015 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1016 | { |
1017 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1018 | int ret; |
1da177e4 | 1019 | |
36d43a43 | 1020 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1021 | return 0; |
facc3530 | 1022 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1023 | if (flags & LOOKUP_REVAL) |
facc3530 AV |
1024 | goto out_force; |
1025 | /* This is an open(2) */ | |
fa3c56bb AV |
1026 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
1027 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) | |
facc3530 | 1028 | goto out_force; |
65a0c149 TM |
1029 | out: |
1030 | return (inode->i_nlink == 0) ? -ENOENT : 0; | |
1da177e4 | 1031 | out_force: |
1fa1e384 N |
1032 | if (flags & LOOKUP_RCU) |
1033 | return -ECHILD; | |
65a0c149 TM |
1034 | ret = __nfs_revalidate_inode(server, inode); |
1035 | if (ret != 0) | |
1036 | return ret; | |
1037 | goto out; | |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | /* | |
1041 | * We judge how long we want to trust negative | |
1042 | * dentries by looking at the parent inode mtime. | |
1043 | * | |
1044 | * If parent mtime has changed, we revalidate, else we wait for a | |
1045 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1046 | * |
1047 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1048 | * suggesting a reval is needed. | |
1da177e4 LT |
1049 | */ |
1050 | static inline | |
1051 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1052 | unsigned int flags) |
1da177e4 | 1053 | { |
1da177e4 | 1054 | /* Don't revalidate a negative dentry if we're creating a new file */ |
fa3c56bb | 1055 | if (flags & LOOKUP_CREATE) |
1da177e4 | 1056 | return 0; |
4eec952e TM |
1057 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1058 | return 1; | |
912a108d | 1059 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1060 | } |
1061 | ||
1062 | /* | |
1063 | * This is called every time the dcache has a lookup hit, | |
1064 | * and we should check whether we can really trust that | |
1065 | * lookup. | |
1066 | * | |
1067 | * NOTE! The hit can be a negative hit too, don't assume | |
1068 | * we have an inode! | |
1069 | * | |
1070 | * If the parent directory is seen to have changed, we throw out the | |
1071 | * cached dentry and do a new lookup. | |
1072 | */ | |
0b728e19 | 1073 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1074 | { |
1075 | struct inode *dir; | |
1076 | struct inode *inode; | |
1077 | struct dentry *parent; | |
e1fb4d05 TM |
1078 | struct nfs_fh *fhandle = NULL; |
1079 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1080 | struct nfs4_label *label = NULL; |
1da177e4 | 1081 | int error; |
1da177e4 | 1082 | |
d51ac1a8 | 1083 | if (flags & LOOKUP_RCU) { |
6aa7de05 | 1084 | parent = READ_ONCE(dentry->d_parent); |
2b0143b5 | 1085 | dir = d_inode_rcu(parent); |
d51ac1a8 N |
1086 | if (!dir) |
1087 | return -ECHILD; | |
1088 | } else { | |
1089 | parent = dget_parent(dentry); | |
2b0143b5 | 1090 | dir = d_inode(parent); |
d51ac1a8 | 1091 | } |
91d5b470 | 1092 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
2b0143b5 | 1093 | inode = d_inode(dentry); |
1da177e4 LT |
1094 | |
1095 | if (!inode) { | |
912a108d N |
1096 | if (nfs_neg_need_reval(dir, dentry, flags)) { |
1097 | if (flags & LOOKUP_RCU) | |
1098 | return -ECHILD; | |
1da177e4 | 1099 | goto out_bad; |
912a108d | 1100 | } |
63519fbc | 1101 | goto out_valid; |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | if (is_bad_inode(inode)) { | |
d51ac1a8 N |
1105 | if (flags & LOOKUP_RCU) |
1106 | return -ECHILD; | |
6de1472f AV |
1107 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1108 | __func__, dentry); | |
1da177e4 LT |
1109 | goto out_bad; |
1110 | } | |
1111 | ||
011e2a7f | 1112 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
15860ab1 TM |
1113 | goto out_set_verifier; |
1114 | ||
1da177e4 | 1115 | /* Force a full look up iff the parent directory has changed */ |
912a108d N |
1116 | if (!nfs_is_exclusive_create(dir, flags) && |
1117 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { | |
cc89684c N |
1118 | error = nfs_lookup_verify_inode(inode, flags); |
1119 | if (error) { | |
1fa1e384 N |
1120 | if (flags & LOOKUP_RCU) |
1121 | return -ECHILD; | |
cc89684c N |
1122 | if (error == -ESTALE) |
1123 | goto out_zap_parent; | |
1124 | goto out_error; | |
1fa1e384 | 1125 | } |
63519fbc | 1126 | nfs_advise_use_readdirplus(dir); |
1da177e4 LT |
1127 | goto out_valid; |
1128 | } | |
1129 | ||
912a108d N |
1130 | if (flags & LOOKUP_RCU) |
1131 | return -ECHILD; | |
1132 | ||
1da177e4 LT |
1133 | if (NFS_STALE(inode)) |
1134 | goto out_bad; | |
1135 | ||
e1fb4d05 TM |
1136 | error = -ENOMEM; |
1137 | fhandle = nfs_alloc_fhandle(); | |
1138 | fattr = nfs_alloc_fattr(); | |
1139 | if (fhandle == NULL || fattr == NULL) | |
1140 | goto out_error; | |
1141 | ||
14c43f76 DQ |
1142 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
1143 | if (IS_ERR(label)) | |
1144 | goto out_error; | |
1145 | ||
6e0d0be7 | 1146 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
1775fd3e | 1147 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
6e0d0be7 | 1148 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
cc89684c | 1149 | if (error == -ESTALE || error == -ENOENT) |
1da177e4 | 1150 | goto out_bad; |
cc89684c N |
1151 | if (error) |
1152 | goto out_error; | |
e1fb4d05 | 1153 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
1da177e4 | 1154 | goto out_bad; |
e1fb4d05 | 1155 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
1da177e4 LT |
1156 | goto out_bad; |
1157 | ||
aa9c2669 DQ |
1158 | nfs_setsecurity(inode, fattr, label); |
1159 | ||
e1fb4d05 TM |
1160 | nfs_free_fattr(fattr); |
1161 | nfs_free_fhandle(fhandle); | |
14c43f76 DQ |
1162 | nfs4_label_free(label); |
1163 | ||
63519fbc TM |
1164 | /* set a readdirplus hint that we had a cache miss */ |
1165 | nfs_force_use_readdirplus(dir); | |
1166 | ||
15860ab1 | 1167 | out_set_verifier: |
cf8ba45e | 1168 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 | 1169 | out_valid: |
d51ac1a8 | 1170 | if (flags & LOOKUP_RCU) { |
6aa7de05 | 1171 | if (parent != READ_ONCE(dentry->d_parent)) |
d51ac1a8 N |
1172 | return -ECHILD; |
1173 | } else | |
1174 | dput(parent); | |
6de1472f AV |
1175 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", |
1176 | __func__, dentry); | |
1da177e4 LT |
1177 | return 1; |
1178 | out_zap_parent: | |
1179 | nfs_zap_caches(dir); | |
1180 | out_bad: | |
d51ac1a8 | 1181 | WARN_ON(flags & LOOKUP_RCU); |
c44600c9 AV |
1182 | nfs_free_fattr(fattr); |
1183 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1184 | nfs4_label_free(label); |
a1643a92 | 1185 | nfs_mark_for_revalidate(dir); |
1da177e4 LT |
1186 | if (inode && S_ISDIR(inode->i_mode)) { |
1187 | /* Purge readdir caches. */ | |
1188 | nfs_zap_caches(inode); | |
a3f432bf BF |
1189 | /* |
1190 | * We can't d_drop the root of a disconnected tree: | |
1191 | * its d_hash is on the s_anon list and d_drop() would hide | |
1192 | * it from shrink_dcache_for_unmount(), leading to busy | |
1193 | * inodes on unmount and further oopses. | |
1194 | */ | |
1195 | if (IS_ROOT(dentry)) | |
d9e80b7d | 1196 | goto out_valid; |
1da177e4 | 1197 | } |
1da177e4 | 1198 | dput(parent); |
6de1472f AV |
1199 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", |
1200 | __func__, dentry); | |
1da177e4 | 1201 | return 0; |
e1fb4d05 | 1202 | out_error: |
d51ac1a8 | 1203 | WARN_ON(flags & LOOKUP_RCU); |
e1fb4d05 TM |
1204 | nfs_free_fattr(fattr); |
1205 | nfs_free_fhandle(fhandle); | |
14c43f76 | 1206 | nfs4_label_free(label); |
e1fb4d05 | 1207 | dput(parent); |
6de1472f AV |
1208 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", |
1209 | __func__, dentry, error); | |
e1fb4d05 | 1210 | return error; |
1da177e4 LT |
1211 | } |
1212 | ||
ecf3d1f1 | 1213 | /* |
2b0143b5 | 1214 | * A weaker form of d_revalidate for revalidating just the d_inode(dentry) |
ecf3d1f1 JL |
1215 | * when we don't really care about the dentry name. This is called when a |
1216 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1217 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1218 | * | |
1219 | * In this situation, we just want to verify that the inode itself is OK | |
1220 | * since the dentry might have changed on the server. | |
1221 | */ | |
1222 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1223 | { | |
2b0143b5 | 1224 | struct inode *inode = d_inode(dentry); |
9cdd1d3f | 1225 | int error = 0; |
ecf3d1f1 JL |
1226 | |
1227 | /* | |
1228 | * I believe we can only get a negative dentry here in the case of a | |
1229 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1230 | * eventually need to do something more here. | |
1231 | */ | |
1232 | if (!inode) { | |
6de1472f AV |
1233 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1234 | __func__, dentry); | |
ecf3d1f1 JL |
1235 | return 1; |
1236 | } | |
1237 | ||
1238 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1239 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1240 | __func__, dentry); | |
ecf3d1f1 JL |
1241 | return 0; |
1242 | } | |
1243 | ||
9cdd1d3f TM |
1244 | if (nfs_mapping_need_revalidate_inode(inode)) |
1245 | error = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
ecf3d1f1 JL |
1246 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", |
1247 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1248 | return !error; | |
1249 | } | |
1250 | ||
1da177e4 LT |
1251 | /* |
1252 | * This is called from dput() when d_count is going to 0. | |
1253 | */ | |
fe15ce44 | 1254 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1255 | { |
6de1472f AV |
1256 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1257 | dentry, dentry->d_flags); | |
1da177e4 | 1258 | |
77f11192 | 1259 | /* Unhash any dentry with a stale inode */ |
2b0143b5 | 1260 | if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) |
77f11192 TM |
1261 | return 1; |
1262 | ||
1da177e4 LT |
1263 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1264 | /* Unhash it, so that ->d_iput() would be called */ | |
1265 | return 1; | |
1266 | } | |
1267 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { | |
1268 | /* Unhash it, so that ancestors of killed async unlink | |
1269 | * files will be cleaned up during umount */ | |
1270 | return 1; | |
1271 | } | |
1272 | return 0; | |
1273 | ||
1274 | } | |
1275 | ||
1f018458 | 1276 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1277 | static void nfs_drop_nlink(struct inode *inode) |
1278 | { | |
1279 | spin_lock(&inode->i_lock); | |
1f018458 TM |
1280 | /* drop the inode if we're reasonably sure this is the last link */ |
1281 | if (inode->i_nlink == 1) | |
1282 | clear_nlink(inode); | |
1283 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; | |
1b83d707 TM |
1284 | spin_unlock(&inode->i_lock); |
1285 | } | |
1286 | ||
1da177e4 LT |
1287 | /* |
1288 | * Called when the dentry loses inode. | |
1289 | * We use it to clean up silly-renamed files. | |
1290 | */ | |
1291 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1292 | { | |
83672d39 NB |
1293 | if (S_ISDIR(inode->i_mode)) |
1294 | /* drop any readdir cache as it could easily be old */ | |
1295 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1296 | ||
1da177e4 | 1297 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1298 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1299 | nfs_drop_nlink(inode); |
1da177e4 | 1300 | } |
1da177e4 LT |
1301 | iput(inode); |
1302 | } | |
1303 | ||
b1942c5f AV |
1304 | static void nfs_d_release(struct dentry *dentry) |
1305 | { | |
1306 | /* free cached devname value, if it survived that far */ | |
1307 | if (unlikely(dentry->d_fsdata)) { | |
1308 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1309 | WARN_ON(1); | |
1310 | else | |
1311 | kfree(dentry->d_fsdata); | |
1312 | } | |
1313 | } | |
1314 | ||
f786aa90 | 1315 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1316 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1317 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1318 | .d_delete = nfs_dentry_delete, |
1319 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1320 | .d_automount = nfs_d_automount, |
b1942c5f | 1321 | .d_release = nfs_d_release, |
1da177e4 | 1322 | }; |
ddda8e0a | 1323 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1324 | |
597d9289 | 1325 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1326 | { |
1327 | struct dentry *res; | |
1328 | struct inode *inode = NULL; | |
e1fb4d05 TM |
1329 | struct nfs_fh *fhandle = NULL; |
1330 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1331 | struct nfs4_label *label = NULL; |
1da177e4 | 1332 | int error; |
1da177e4 | 1333 | |
6de1472f | 1334 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1335 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 | 1336 | |
130f9ab7 AV |
1337 | if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) |
1338 | return ERR_PTR(-ENAMETOOLONG); | |
1da177e4 | 1339 | |
fd684071 TM |
1340 | /* |
1341 | * If we're doing an exclusive create, optimize away the lookup | |
1342 | * but don't hash the dentry. | |
1343 | */ | |
130f9ab7 AV |
1344 | if (nfs_is_exclusive_create(dir, flags)) |
1345 | return NULL; | |
1da177e4 | 1346 | |
e1fb4d05 TM |
1347 | res = ERR_PTR(-ENOMEM); |
1348 | fhandle = nfs_alloc_fhandle(); | |
1349 | fattr = nfs_alloc_fattr(); | |
1350 | if (fhandle == NULL || fattr == NULL) | |
1351 | goto out; | |
1352 | ||
14c43f76 DQ |
1353 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1354 | if (IS_ERR(label)) | |
1355 | goto out; | |
1356 | ||
6e0d0be7 | 1357 | trace_nfs_lookup_enter(dir, dentry, flags); |
1775fd3e | 1358 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1359 | if (error == -ENOENT) |
1360 | goto no_entry; | |
1361 | if (error < 0) { | |
1362 | res = ERR_PTR(error); | |
bf130914 | 1363 | goto out_label; |
1da177e4 | 1364 | } |
1775fd3e | 1365 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1366 | res = ERR_CAST(inode); |
03f28e3a | 1367 | if (IS_ERR(res)) |
bf130914 | 1368 | goto out_label; |
54ceac45 | 1369 | |
63519fbc TM |
1370 | /* Notify readdir to use READDIRPLUS */ |
1371 | nfs_force_use_readdirplus(dir); | |
d69ee9b8 | 1372 | |
1da177e4 | 1373 | no_entry: |
41d28bca | 1374 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1375 | if (res != NULL) { |
1376 | if (IS_ERR(res)) | |
bf130914 | 1377 | goto out_label; |
1da177e4 | 1378 | dentry = res; |
9eaef27b | 1379 | } |
1da177e4 | 1380 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
bf130914 | 1381 | out_label: |
6e0d0be7 | 1382 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1383 | nfs4_label_free(label); |
1da177e4 | 1384 | out: |
e1fb4d05 TM |
1385 | nfs_free_fattr(fattr); |
1386 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1387 | return res; |
1388 | } | |
ddda8e0a | 1389 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1390 | |
89d77c8f | 1391 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1392 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1393 | |
f786aa90 | 1394 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1395 | .d_revalidate = nfs4_lookup_revalidate, |
1da177e4 LT |
1396 | .d_delete = nfs_dentry_delete, |
1397 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1398 | .d_automount = nfs_d_automount, |
b1942c5f | 1399 | .d_release = nfs_d_release, |
1da177e4 | 1400 | }; |
89d77c8f | 1401 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1402 | |
8a5e929d AV |
1403 | static fmode_t flags_to_mode(int flags) |
1404 | { | |
1405 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1406 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1407 | res |= FMODE_READ; | |
1408 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1409 | res |= FMODE_WRITE; | |
1410 | return res; | |
1411 | } | |
1412 | ||
532d4def | 1413 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) |
cd9a1c0e | 1414 | { |
532d4def | 1415 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); |
cd9a1c0e TM |
1416 | } |
1417 | ||
1418 | static int do_open(struct inode *inode, struct file *filp) | |
1419 | { | |
f1fe29b4 | 1420 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1421 | return 0; |
1422 | } | |
1423 | ||
d9585277 AV |
1424 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1425 | struct dentry *dentry, | |
30d90494 | 1426 | struct file *file, unsigned open_flags, |
d9585277 | 1427 | int *opened) |
cd9a1c0e | 1428 | { |
0dd2b474 MS |
1429 | int err; |
1430 | ||
30d90494 AV |
1431 | err = finish_open(file, dentry, do_open, opened); |
1432 | if (err) | |
d9585277 | 1433 | goto out; |
eaa2b82c N |
1434 | if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) |
1435 | nfs_file_set_open_context(file, ctx); | |
1436 | else | |
1437 | err = -ESTALE; | |
cd9a1c0e | 1438 | out: |
d9585277 | 1439 | return err; |
cd9a1c0e TM |
1440 | } |
1441 | ||
73a79706 BS |
1442 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1443 | struct file *file, unsigned open_flags, | |
1444 | umode_t mode, int *opened) | |
1da177e4 | 1445 | { |
c94c0953 | 1446 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
cd9a1c0e | 1447 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1448 | struct dentry *res; |
1449 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1450 | struct inode *inode; |
1472b83e | 1451 | unsigned int lookup_flags = 0; |
c94c0953 | 1452 | bool switched = false; |
898f635c | 1453 | int err; |
1da177e4 | 1454 | |
0dd2b474 | 1455 | /* Expect a negative dentry */ |
2b0143b5 | 1456 | BUG_ON(d_inode(dentry)); |
0dd2b474 | 1457 | |
1e8968c5 | 1458 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1459 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1460 | |
9597c13b JL |
1461 | err = nfs_check_flags(open_flags); |
1462 | if (err) | |
1463 | return err; | |
1464 | ||
0dd2b474 MS |
1465 | /* NFS only supports OPEN on regular files */ |
1466 | if ((open_flags & O_DIRECTORY)) { | |
00699ad8 | 1467 | if (!d_in_lookup(dentry)) { |
0dd2b474 MS |
1468 | /* |
1469 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1470 | * revalidated and is fine, no need to perform lookup | |
1471 | * again | |
1472 | */ | |
d9585277 | 1473 | return -ENOENT; |
0dd2b474 | 1474 | } |
1472b83e | 1475 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1476 | goto no_open; |
02a913a7 | 1477 | } |
1da177e4 | 1478 | |
0dd2b474 | 1479 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1480 | return -ENAMETOOLONG; |
cd9a1c0e | 1481 | |
0dd2b474 | 1482 | if (open_flags & O_CREAT) { |
dff25ddb AG |
1483 | struct nfs_server *server = NFS_SERVER(dir); |
1484 | ||
1485 | if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) | |
1486 | mode &= ~current_umask(); | |
1487 | ||
536e43d1 | 1488 | attr.ia_valid |= ATTR_MODE; |
dff25ddb | 1489 | attr.ia_mode = mode; |
0dd2b474 | 1490 | } |
536e43d1 TM |
1491 | if (open_flags & O_TRUNC) { |
1492 | attr.ia_valid |= ATTR_SIZE; | |
1493 | attr.ia_size = 0; | |
cd9a1c0e TM |
1494 | } |
1495 | ||
c94c0953 AV |
1496 | if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { |
1497 | d_drop(dentry); | |
1498 | switched = true; | |
1499 | dentry = d_alloc_parallel(dentry->d_parent, | |
1500 | &dentry->d_name, &wq); | |
1501 | if (IS_ERR(dentry)) | |
1502 | return PTR_ERR(dentry); | |
1503 | if (unlikely(!d_in_lookup(dentry))) | |
1504 | return finish_no_open(file, dentry); | |
1505 | } | |
1506 | ||
532d4def | 1507 | ctx = create_nfs_open_context(dentry, open_flags, file); |
0dd2b474 MS |
1508 | err = PTR_ERR(ctx); |
1509 | if (IS_ERR(ctx)) | |
d9585277 | 1510 | goto out; |
0dd2b474 | 1511 | |
6e0d0be7 | 1512 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
5bc2afc2 | 1513 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened); |
f46e0bd3 | 1514 | if (IS_ERR(inode)) { |
0dd2b474 | 1515 | err = PTR_ERR(inode); |
6e0d0be7 | 1516 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1517 | put_nfs_open_context(ctx); |
d20cb71d | 1518 | d_drop(dentry); |
0dd2b474 MS |
1519 | switch (err) { |
1520 | case -ENOENT: | |
774d9513 | 1521 | d_splice_alias(NULL, dentry); |
809fd143 | 1522 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1523 | break; |
1524 | case -EISDIR: | |
1525 | case -ENOTDIR: | |
1526 | goto no_open; | |
1527 | case -ELOOP: | |
1528 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1529 | goto no_open; |
0dd2b474 | 1530 | break; |
1da177e4 | 1531 | /* case -EINVAL: */ |
0dd2b474 MS |
1532 | default: |
1533 | break; | |
1da177e4 | 1534 | } |
d9585277 | 1535 | goto out; |
cd9a1c0e | 1536 | } |
0dd2b474 | 1537 | |
275bb307 | 1538 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened); |
6e0d0be7 | 1539 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1540 | put_nfs_open_context(ctx); |
d9585277 | 1541 | out: |
c94c0953 AV |
1542 | if (unlikely(switched)) { |
1543 | d_lookup_done(dentry); | |
1544 | dput(dentry); | |
1545 | } | |
d9585277 | 1546 | return err; |
0dd2b474 | 1547 | |
1da177e4 | 1548 | no_open: |
1472b83e | 1549 | res = nfs_lookup(dir, dentry, lookup_flags); |
c94c0953 AV |
1550 | if (switched) { |
1551 | d_lookup_done(dentry); | |
1552 | if (!res) | |
1553 | res = dentry; | |
1554 | else | |
1555 | dput(dentry); | |
1556 | } | |
0dd2b474 | 1557 | if (IS_ERR(res)) |
c94c0953 | 1558 | return PTR_ERR(res); |
e45198a6 | 1559 | return finish_no_open(file, res); |
1da177e4 | 1560 | } |
89d77c8f | 1561 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1562 | |
0b728e19 | 1563 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1564 | { |
657e94b6 | 1565 | struct inode *inode; |
50de348c | 1566 | int ret = 0; |
1da177e4 | 1567 | |
fa3c56bb | 1568 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
eda72afb MS |
1569 | goto no_open; |
1570 | if (d_mountpoint(dentry)) | |
5584c306 | 1571 | goto no_open; |
49f9a0fa TM |
1572 | if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1573 | goto no_open; | |
2b484297 | 1574 | |
2b0143b5 | 1575 | inode = d_inode(dentry); |
2b484297 | 1576 | |
1da177e4 LT |
1577 | /* We can't create new files in nfs_open_revalidate(), so we |
1578 | * optimize away revalidation of negative dentries. | |
1579 | */ | |
216d5d06 | 1580 | if (inode == NULL) { |
49317a7f N |
1581 | struct dentry *parent; |
1582 | struct inode *dir; | |
1583 | ||
912a108d | 1584 | if (flags & LOOKUP_RCU) { |
6aa7de05 | 1585 | parent = READ_ONCE(dentry->d_parent); |
2b0143b5 | 1586 | dir = d_inode_rcu(parent); |
912a108d N |
1587 | if (!dir) |
1588 | return -ECHILD; | |
1589 | } else { | |
1590 | parent = dget_parent(dentry); | |
2b0143b5 | 1591 | dir = d_inode(parent); |
912a108d | 1592 | } |
fa3c56bb | 1593 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
216d5d06 | 1594 | ret = 1; |
912a108d N |
1595 | else if (flags & LOOKUP_RCU) |
1596 | ret = -ECHILD; | |
1597 | if (!(flags & LOOKUP_RCU)) | |
1598 | dput(parent); | |
6aa7de05 | 1599 | else if (parent != READ_ONCE(dentry->d_parent)) |
912a108d | 1600 | return -ECHILD; |
1da177e4 | 1601 | goto out; |
216d5d06 TM |
1602 | } |
1603 | ||
1da177e4 LT |
1604 | /* NFS only supports OPEN on regular files */ |
1605 | if (!S_ISREG(inode->i_mode)) | |
49317a7f | 1606 | goto no_open; |
1da177e4 | 1607 | /* We cannot do exclusive creation on a positive dentry */ |
fa3c56bb | 1608 | if (flags & LOOKUP_EXCL) |
49317a7f | 1609 | goto no_open; |
1da177e4 | 1610 | |
0ef97dcf MS |
1611 | /* Let f_op->open() actually open (and revalidate) the file */ |
1612 | ret = 1; | |
536e43d1 | 1613 | |
1da177e4 | 1614 | out: |
1da177e4 | 1615 | return ret; |
535918f1 | 1616 | |
5584c306 | 1617 | no_open: |
0b728e19 | 1618 | return nfs_lookup_revalidate(dentry, flags); |
c0204fd2 TM |
1619 | } |
1620 | ||
1da177e4 LT |
1621 | #endif /* CONFIG_NFSV4 */ |
1622 | ||
1da177e4 LT |
1623 | /* |
1624 | * Code common to create, mkdir, and mknod. | |
1625 | */ | |
1626 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1627 | struct nfs_fattr *fattr, |
1628 | struct nfs4_label *label) | |
1da177e4 | 1629 | { |
fab728e1 | 1630 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 1631 | struct inode *dir = d_inode(parent); |
1da177e4 LT |
1632 | struct inode *inode; |
1633 | int error = -EACCES; | |
1634 | ||
fab728e1 TM |
1635 | d_drop(dentry); |
1636 | ||
1da177e4 | 1637 | /* We may have been initialized further down */ |
2b0143b5 | 1638 | if (d_really_is_positive(dentry)) |
fab728e1 | 1639 | goto out; |
1da177e4 | 1640 | if (fhandle->size == 0) { |
1775fd3e | 1641 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1642 | if (error) |
fab728e1 | 1643 | goto out_error; |
1da177e4 | 1644 | } |
5724ab37 | 1645 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1646 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1647 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
1775fd3e | 1648 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL); |
1da177e4 | 1649 | if (error < 0) |
fab728e1 | 1650 | goto out_error; |
1da177e4 | 1651 | } |
1775fd3e | 1652 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
03f28e3a TM |
1653 | error = PTR_ERR(inode); |
1654 | if (IS_ERR(inode)) | |
fab728e1 TM |
1655 | goto out_error; |
1656 | d_add(dentry, inode); | |
1657 | out: | |
1658 | dput(parent); | |
1da177e4 | 1659 | return 0; |
fab728e1 TM |
1660 | out_error: |
1661 | nfs_mark_for_revalidate(dir); | |
1662 | dput(parent); | |
1663 | return error; | |
1da177e4 | 1664 | } |
ddda8e0a | 1665 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1666 | |
1667 | /* | |
1668 | * Following a failed create operation, we drop the dentry rather | |
1669 | * than retain a negative dentry. This avoids a problem in the event | |
1670 | * that the operation succeeded on the server, but an error in the | |
1671 | * reply path made it appear to have failed. | |
1672 | */ | |
597d9289 | 1673 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1674 | umode_t mode, bool excl) |
1da177e4 LT |
1675 | { |
1676 | struct iattr attr; | |
ebfc3b49 | 1677 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1678 | int error; |
1da177e4 | 1679 | |
1e8968c5 | 1680 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 1681 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1682 | |
1683 | attr.ia_mode = mode; | |
1684 | attr.ia_valid = ATTR_MODE; | |
1685 | ||
8b0ad3d4 | 1686 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1687 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1688 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1689 | if (error != 0) |
1690 | goto out_err; | |
1da177e4 LT |
1691 | return 0; |
1692 | out_err: | |
1da177e4 LT |
1693 | d_drop(dentry); |
1694 | return error; | |
1695 | } | |
ddda8e0a | 1696 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1697 | |
1698 | /* | |
1699 | * See comments for nfs_proc_create regarding failed operations. | |
1700 | */ | |
597d9289 | 1701 | int |
1a67aafb | 1702 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1703 | { |
1704 | struct iattr attr; | |
1705 | int status; | |
1706 | ||
1e8968c5 | 1707 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 1708 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1709 | |
1da177e4 LT |
1710 | attr.ia_mode = mode; |
1711 | attr.ia_valid = ATTR_MODE; | |
1712 | ||
1ca42382 | 1713 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1714 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1715 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1716 | if (status != 0) |
1717 | goto out_err; | |
1da177e4 LT |
1718 | return 0; |
1719 | out_err: | |
1da177e4 LT |
1720 | d_drop(dentry); |
1721 | return status; | |
1722 | } | |
ddda8e0a | 1723 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1724 | |
1725 | /* | |
1726 | * See comments for nfs_proc_create regarding failed operations. | |
1727 | */ | |
597d9289 | 1728 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1729 | { |
1730 | struct iattr attr; | |
1731 | int error; | |
1732 | ||
1e8968c5 | 1733 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 1734 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1735 | |
1736 | attr.ia_valid = ATTR_MODE; | |
1737 | attr.ia_mode = mode | S_IFDIR; | |
1738 | ||
1ca42382 | 1739 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1740 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1741 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1742 | if (error != 0) |
1743 | goto out_err; | |
1da177e4 LT |
1744 | return 0; |
1745 | out_err: | |
1746 | d_drop(dentry); | |
1da177e4 LT |
1747 | return error; |
1748 | } | |
ddda8e0a | 1749 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1750 | |
d45b9d8b TM |
1751 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1752 | { | |
dc3f4198 | 1753 | if (simple_positive(dentry)) |
d45b9d8b TM |
1754 | d_delete(dentry); |
1755 | } | |
1756 | ||
597d9289 | 1757 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1758 | { |
1759 | int error; | |
1760 | ||
1e8968c5 | 1761 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 1762 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1763 | |
1ca42382 | 1764 | trace_nfs_rmdir_enter(dir, dentry); |
2b0143b5 | 1765 | if (d_really_is_positive(dentry)) { |
884be175 | 1766 | down_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1767 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1768 | /* Ensure the VFS deletes this inode */ | |
1769 | switch (error) { | |
1770 | case 0: | |
2b0143b5 | 1771 | clear_nlink(d_inode(dentry)); |
ba6c0592 TM |
1772 | break; |
1773 | case -ENOENT: | |
1774 | nfs_dentry_handle_enoent(dentry); | |
1775 | } | |
884be175 | 1776 | up_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1777 | } else |
1778 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1779 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1780 | |
1781 | return error; | |
1782 | } | |
ddda8e0a | 1783 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1784 | |
1da177e4 LT |
1785 | /* |
1786 | * Remove a file after making sure there are no pending writes, | |
1787 | * and after checking that the file has only one user. | |
1788 | * | |
1789 | * We invalidate the attribute cache and free the inode prior to the operation | |
1790 | * to avoid possible races if the server reuses the inode. | |
1791 | */ | |
1792 | static int nfs_safe_remove(struct dentry *dentry) | |
1793 | { | |
2b0143b5 DH |
1794 | struct inode *dir = d_inode(dentry->d_parent); |
1795 | struct inode *inode = d_inode(dentry); | |
1da177e4 LT |
1796 | int error = -EBUSY; |
1797 | ||
6de1472f | 1798 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
1799 | |
1800 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1801 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1802 | error = 0; | |
1803 | goto out; | |
1804 | } | |
1805 | ||
1ca42382 | 1806 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1807 | if (inode != NULL) { |
57ec14c5 | 1808 | NFS_PROTO(inode)->return_delegation(inode); |
1da177e4 | 1809 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
1da177e4 | 1810 | if (error == 0) |
1b83d707 | 1811 | nfs_drop_nlink(inode); |
1da177e4 LT |
1812 | } else |
1813 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); | |
d45b9d8b TM |
1814 | if (error == -ENOENT) |
1815 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1816 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1817 | out: |
1818 | return error; | |
1819 | } | |
1820 | ||
1821 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1822 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1823 | * | |
1824 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1825 | */ | |
597d9289 | 1826 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1827 | { |
1828 | int error; | |
1829 | int need_rehash = 0; | |
1830 | ||
1e8968c5 | 1831 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 1832 | dir->i_ino, dentry); |
1da177e4 | 1833 | |
1ca42382 | 1834 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1835 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1836 | if (d_count(dentry) > 1) { |
1da177e4 | 1837 | spin_unlock(&dentry->d_lock); |
ccfeb506 | 1838 | /* Start asynchronous writeout of the inode */ |
2b0143b5 | 1839 | write_inode_now(d_inode(dentry), 0); |
1da177e4 | 1840 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1841 | goto out; |
1da177e4 LT |
1842 | } |
1843 | if (!d_unhashed(dentry)) { | |
1844 | __d_drop(dentry); | |
1845 | need_rehash = 1; | |
1846 | } | |
1847 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1848 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1849 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1850 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1851 | } else if (need_rehash) | |
1852 | d_rehash(dentry); | |
1ca42382 TM |
1853 | out: |
1854 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1855 | return error; |
1856 | } | |
ddda8e0a | 1857 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1858 | |
873101b3 CL |
1859 | /* |
1860 | * To create a symbolic link, most file systems instantiate a new inode, | |
1861 | * add a page to it containing the path, then write it out to the disk | |
1862 | * using prepare_write/commit_write. | |
1863 | * | |
1864 | * Unfortunately the NFS client can't create the in-core inode first | |
1865 | * because it needs a file handle to create an in-core inode (see | |
1866 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1867 | * symlink request has completed on the server. | |
1868 | * | |
1869 | * So instead we allocate a raw page, copy the symname into it, then do | |
1870 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1871 | * now have a new file handle and can instantiate an in-core NFS inode | |
1872 | * and move the raw page into its mapping. | |
1873 | */ | |
597d9289 | 1874 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 1875 | { |
873101b3 CL |
1876 | struct page *page; |
1877 | char *kaddr; | |
1da177e4 | 1878 | struct iattr attr; |
873101b3 | 1879 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
1880 | int error; |
1881 | ||
1e8968c5 | 1882 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 1883 | dir->i_ino, dentry, symname); |
1da177e4 | 1884 | |
873101b3 CL |
1885 | if (pathlen > PAGE_SIZE) |
1886 | return -ENAMETOOLONG; | |
1da177e4 | 1887 | |
873101b3 CL |
1888 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
1889 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 1890 | |
e8ecde25 | 1891 | page = alloc_page(GFP_USER); |
76566991 | 1892 | if (!page) |
873101b3 | 1893 | return -ENOMEM; |
873101b3 | 1894 | |
e8ecde25 | 1895 | kaddr = page_address(page); |
873101b3 CL |
1896 | memcpy(kaddr, symname, pathlen); |
1897 | if (pathlen < PAGE_SIZE) | |
1898 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
873101b3 | 1899 | |
1ca42382 | 1900 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 1901 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 1902 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 1903 | if (error != 0) { |
1e8968c5 | 1904 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 1905 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 1906 | dentry, symname, error); |
1da177e4 | 1907 | d_drop(dentry); |
873101b3 | 1908 | __free_page(page); |
873101b3 CL |
1909 | return error; |
1910 | } | |
1911 | ||
1912 | /* | |
1913 | * No big deal if we can't add this page to the page cache here. | |
1914 | * READLINK will get the missing page from the server if needed. | |
1915 | */ | |
2b0143b5 | 1916 | if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, |
873101b3 | 1917 | GFP_KERNEL)) { |
873101b3 CL |
1918 | SetPageUptodate(page); |
1919 | unlock_page(page); | |
a0b54add RA |
1920 | /* |
1921 | * add_to_page_cache_lru() grabs an extra page refcount. | |
1922 | * Drop it here to avoid leaking this page later. | |
1923 | */ | |
09cbfeaf | 1924 | put_page(page); |
873101b3 CL |
1925 | } else |
1926 | __free_page(page); | |
1927 | ||
873101b3 | 1928 | return 0; |
1da177e4 | 1929 | } |
ddda8e0a | 1930 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 1931 | |
597d9289 | 1932 | int |
1da177e4 LT |
1933 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
1934 | { | |
2b0143b5 | 1935 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
1936 | int error; |
1937 | ||
6de1472f AV |
1938 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
1939 | old_dentry, dentry); | |
1da177e4 | 1940 | |
1fd1085b | 1941 | trace_nfs_link_enter(inode, dir, dentry); |
57ec14c5 | 1942 | NFS_PROTO(inode)->return_delegation(inode); |
9a3936aa | 1943 | |
9697d234 | 1944 | d_drop(dentry); |
1da177e4 | 1945 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 1946 | if (error == 0) { |
7de9c6ee | 1947 | ihold(inode); |
9697d234 | 1948 | d_add(dentry, inode); |
cf809556 | 1949 | } |
1fd1085b | 1950 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
1951 | return error; |
1952 | } | |
ddda8e0a | 1953 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
1954 | |
1955 | /* | |
1956 | * RENAME | |
1957 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
1958 | * different file handle for the same inode after a rename (e.g. when | |
1959 | * moving to a different directory). A fail-safe method to do so would | |
1960 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
1961 | * rename the old file using the sillyrename stuff. This way, the original | |
1962 | * file in old_dir will go away when the last process iput()s the inode. | |
1963 | * | |
1964 | * FIXED. | |
1965 | * | |
1966 | * It actually works quite well. One needs to have the possibility for | |
1967 | * at least one ".nfs..." file in each directory the file ever gets | |
1968 | * moved or linked to which happens automagically with the new | |
1969 | * implementation that only depends on the dcache stuff instead of | |
1970 | * using the inode layer | |
1971 | * | |
1972 | * Unfortunately, things are a little more complicated than indicated | |
1973 | * above. For a cross-directory move, we want to make sure we can get | |
1974 | * rid of the old inode after the operation. This means there must be | |
1975 | * no pending writes (if it's a file), and the use count must be 1. | |
1976 | * If these conditions are met, we can drop the dentries before doing | |
1977 | * the rename. | |
1978 | */ | |
597d9289 | 1979 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1cd66c93 MS |
1980 | struct inode *new_dir, struct dentry *new_dentry, |
1981 | unsigned int flags) | |
1da177e4 | 1982 | { |
2b0143b5 DH |
1983 | struct inode *old_inode = d_inode(old_dentry); |
1984 | struct inode *new_inode = d_inode(new_dentry); | |
d9f29500 | 1985 | struct dentry *dentry = NULL, *rehash = NULL; |
80a491fd | 1986 | struct rpc_task *task; |
1da177e4 LT |
1987 | int error = -EBUSY; |
1988 | ||
1cd66c93 MS |
1989 | if (flags) |
1990 | return -EINVAL; | |
1991 | ||
6de1472f AV |
1992 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
1993 | old_dentry, new_dentry, | |
84d08fa8 | 1994 | d_count(new_dentry)); |
1da177e4 | 1995 | |
70ded201 | 1996 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 1997 | /* |
28f79a1a MS |
1998 | * For non-directories, check whether the target is busy and if so, |
1999 | * make a copy of the dentry and then do a silly-rename. If the | |
2000 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2001 | * the new target. | |
1da177e4 | 2002 | */ |
27226104 MS |
2003 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2004 | /* | |
2005 | * To prevent any new references to the target during the | |
2006 | * rename, we unhash the dentry in advance. | |
2007 | */ | |
d9f29500 | 2008 | if (!d_unhashed(new_dentry)) { |
27226104 | 2009 | d_drop(new_dentry); |
d9f29500 BC |
2010 | rehash = new_dentry; |
2011 | } | |
1da177e4 | 2012 | |
84d08fa8 | 2013 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2014 | int err; |
2015 | ||
2016 | /* copy the target dentry's name */ | |
2017 | dentry = d_alloc(new_dentry->d_parent, | |
2018 | &new_dentry->d_name); | |
2019 | if (!dentry) | |
2020 | goto out; | |
2021 | ||
2022 | /* silly-rename the existing target ... */ | |
2023 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2024 | if (err) |
27226104 | 2025 | goto out; |
24e93025 MS |
2026 | |
2027 | new_dentry = dentry; | |
d9f29500 | 2028 | rehash = NULL; |
24e93025 | 2029 | new_inode = NULL; |
27226104 | 2030 | } |
b1e4adf4 | 2031 | } |
1da177e4 | 2032 | |
57ec14c5 | 2033 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
b1e4adf4 | 2034 | if (new_inode != NULL) |
57ec14c5 | 2035 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
1da177e4 | 2036 | |
d9f29500 | 2037 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
80a491fd JL |
2038 | if (IS_ERR(task)) { |
2039 | error = PTR_ERR(task); | |
2040 | goto out; | |
2041 | } | |
2042 | ||
2043 | error = rpc_wait_for_completion_task(task); | |
818a8dbe BC |
2044 | if (error != 0) { |
2045 | ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; | |
2046 | /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ | |
2047 | smp_wmb(); | |
2048 | } else | |
80a491fd JL |
2049 | error = task->tk_status; |
2050 | rpc_put_task(task); | |
d9f29500 | 2051 | nfs_mark_for_revalidate(old_inode); |
1da177e4 | 2052 | out: |
d9f29500 BC |
2053 | if (rehash) |
2054 | d_rehash(rehash); | |
70ded201 TM |
2055 | trace_nfs_rename_exit(old_dir, old_dentry, |
2056 | new_dir, new_dentry, error); | |
d9f29500 BC |
2057 | if (!error) { |
2058 | if (new_inode != NULL) | |
2059 | nfs_drop_nlink(new_inode); | |
2060 | /* | |
2061 | * The d_move() should be here instead of in an async RPC completion | |
2062 | * handler because we need the proper locks to move the dentry. If | |
2063 | * we're interrupted by a signal, the async RPC completion handler | |
2064 | * should mark the directories for revalidation. | |
2065 | */ | |
2066 | d_move(old_dentry, new_dentry); | |
2067 | nfs_set_verifier(new_dentry, | |
2068 | nfs_save_change_attribute(new_dir)); | |
2069 | } else if (error == -ENOENT) | |
2070 | nfs_dentry_handle_enoent(old_dentry); | |
2071 | ||
1da177e4 LT |
2072 | /* new dentry created? */ |
2073 | if (dentry) | |
2074 | dput(dentry); | |
1da177e4 LT |
2075 | return error; |
2076 | } | |
ddda8e0a | 2077 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2078 | |
cfcea3e8 TM |
2079 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2080 | static LIST_HEAD(nfs_access_lru_list); | |
2081 | static atomic_long_t nfs_access_nr_entries; | |
2082 | ||
3a505845 TM |
2083 | static unsigned long nfs_access_max_cachesize = ULONG_MAX; |
2084 | module_param(nfs_access_max_cachesize, ulong, 0644); | |
2085 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2086 | ||
1c3c07e9 TM |
2087 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2088 | { | |
2089 | put_rpccred(entry->cred); | |
f682a398 | 2090 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2091 | smp_mb__before_atomic(); |
cfcea3e8 | 2092 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2093 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2094 | } |
2095 | ||
1a81bb8a TM |
2096 | static void nfs_access_free_list(struct list_head *head) |
2097 | { | |
2098 | struct nfs_access_entry *cache; | |
2099 | ||
2100 | while (!list_empty(head)) { | |
2101 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2102 | list_del(&cache->lru); | |
2103 | nfs_access_free_entry(cache); | |
2104 | } | |
2105 | } | |
2106 | ||
3a505845 TM |
2107 | static unsigned long |
2108 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2109 | { |
2110 | LIST_HEAD(head); | |
aa510da5 | 2111 | struct nfs_inode *nfsi, *next; |
979df72e | 2112 | struct nfs_access_entry *cache; |
1ab6c499 | 2113 | long freed = 0; |
979df72e | 2114 | |
a50f7951 | 2115 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2116 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2117 | struct inode *inode; |
2118 | ||
2119 | if (nr_to_scan-- == 0) | |
2120 | break; | |
9c7e7e23 | 2121 | inode = &nfsi->vfs_inode; |
979df72e TM |
2122 | spin_lock(&inode->i_lock); |
2123 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2124 | goto remove_lru_entry; | |
2125 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2126 | struct nfs_access_entry, lru); | |
2127 | list_move(&cache->lru, &head); | |
2128 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2129 | freed++; |
979df72e TM |
2130 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2131 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2132 | &nfs_access_lru_list); | |
2133 | else { | |
2134 | remove_lru_entry: | |
2135 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2136 | smp_mb__before_atomic(); |
979df72e | 2137 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2138 | smp_mb__after_atomic(); |
979df72e | 2139 | } |
59844a9b | 2140 | spin_unlock(&inode->i_lock); |
979df72e TM |
2141 | } |
2142 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2143 | nfs_access_free_list(&head); |
1ab6c499 DC |
2144 | return freed; |
2145 | } | |
2146 | ||
3a505845 TM |
2147 | unsigned long |
2148 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2149 | { | |
2150 | int nr_to_scan = sc->nr_to_scan; | |
2151 | gfp_t gfp_mask = sc->gfp_mask; | |
2152 | ||
2153 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2154 | return SHRINK_STOP; | |
2155 | return nfs_do_access_cache_scan(nr_to_scan); | |
2156 | } | |
2157 | ||
2158 | ||
1ab6c499 DC |
2159 | unsigned long |
2160 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2161 | { | |
55f841ce | 2162 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2163 | } |
2164 | ||
3a505845 TM |
2165 | static void |
2166 | nfs_access_cache_enforce_limit(void) | |
2167 | { | |
2168 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2169 | unsigned long diff; | |
2170 | unsigned int nr_to_scan; | |
2171 | ||
2172 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2173 | return; | |
2174 | nr_to_scan = 100; | |
2175 | diff = nr_entries - nfs_access_max_cachesize; | |
2176 | if (diff < nr_to_scan) | |
2177 | nr_to_scan = diff; | |
2178 | nfs_do_access_cache_scan(nr_to_scan); | |
2179 | } | |
2180 | ||
1a81bb8a | 2181 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2182 | { |
1c3c07e9 | 2183 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2184 | struct rb_node *n; |
1c3c07e9 TM |
2185 | struct nfs_access_entry *entry; |
2186 | ||
2187 | /* Unhook entries from the cache */ | |
2188 | while ((n = rb_first(root_node)) != NULL) { | |
2189 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2190 | rb_erase(n, root_node); | |
1a81bb8a | 2191 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2192 | } |
2193 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2194 | } |
2195 | ||
1c3c07e9 | 2196 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2197 | { |
1a81bb8a TM |
2198 | LIST_HEAD(head); |
2199 | ||
2200 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2201 | return; | |
cfcea3e8 | 2202 | /* Remove from global LRU init */ |
1a81bb8a TM |
2203 | spin_lock(&nfs_access_lru_lock); |
2204 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2205 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2206 | |
1c3c07e9 | 2207 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2208 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2209 | spin_unlock(&inode->i_lock); | |
2210 | spin_unlock(&nfs_access_lru_lock); | |
2211 | nfs_access_free_list(&head); | |
1c3c07e9 | 2212 | } |
1c606fb7 | 2213 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2214 | |
1c3c07e9 TM |
2215 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
2216 | { | |
2217 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
2218 | struct nfs_access_entry *entry; | |
2219 | ||
2220 | while (n != NULL) { | |
2221 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2222 | ||
2223 | if (cred < entry->cred) | |
2224 | n = n->rb_left; | |
2225 | else if (cred > entry->cred) | |
2226 | n = n->rb_right; | |
2227 | else | |
2228 | return entry; | |
1da177e4 | 2229 | } |
1c3c07e9 TM |
2230 | return NULL; |
2231 | } | |
2232 | ||
57b69181 | 2233 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res, bool may_block) |
1c3c07e9 TM |
2234 | { |
2235 | struct nfs_inode *nfsi = NFS_I(inode); | |
2236 | struct nfs_access_entry *cache; | |
57b69181 TM |
2237 | bool retry = true; |
2238 | int err; | |
1c3c07e9 | 2239 | |
dc59250c | 2240 | spin_lock(&inode->i_lock); |
57b69181 TM |
2241 | for(;;) { |
2242 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2243 | goto out_zap; | |
2244 | cache = nfs_access_search_rbtree(inode, cred); | |
2245 | err = -ENOENT; | |
2246 | if (cache == NULL) | |
2247 | goto out; | |
2248 | /* Found an entry, is our attribute cache valid? */ | |
21c3ba7e | 2249 | if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
57b69181 TM |
2250 | break; |
2251 | err = -ECHILD; | |
2252 | if (!may_block) | |
2253 | goto out; | |
2254 | if (!retry) | |
2255 | goto out_zap; | |
2256 | spin_unlock(&inode->i_lock); | |
2257 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2258 | if (err) | |
2259 | return err; | |
2260 | spin_lock(&inode->i_lock); | |
2261 | retry = false; | |
2262 | } | |
1c3c07e9 TM |
2263 | res->cred = cache->cred; |
2264 | res->mask = cache->mask; | |
cfcea3e8 | 2265 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2266 | err = 0; |
2267 | out: | |
2268 | spin_unlock(&inode->i_lock); | |
2269 | return err; | |
1c3c07e9 | 2270 | out_zap: |
1a81bb8a TM |
2271 | spin_unlock(&inode->i_lock); |
2272 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2273 | return -ENOENT; |
2274 | } | |
2275 | ||
f682a398 N |
2276 | static int nfs_access_get_cached_rcu(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
2277 | { | |
2278 | /* Only check the most recently returned cache entry, | |
2279 | * but do it without locking. | |
2280 | */ | |
2281 | struct nfs_inode *nfsi = NFS_I(inode); | |
2282 | struct nfs_access_entry *cache; | |
2283 | int err = -ECHILD; | |
2284 | struct list_head *lh; | |
2285 | ||
2286 | rcu_read_lock(); | |
2287 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2288 | goto out; | |
2289 | lh = rcu_dereference(nfsi->access_cache_entry_lru.prev); | |
2290 | cache = list_entry(lh, struct nfs_access_entry, lru); | |
2291 | if (lh == &nfsi->access_cache_entry_lru || | |
2292 | cred != cache->cred) | |
2293 | cache = NULL; | |
2294 | if (cache == NULL) | |
2295 | goto out; | |
21c3ba7e | 2296 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
f682a398 | 2297 | goto out; |
f682a398 N |
2298 | res->cred = cache->cred; |
2299 | res->mask = cache->mask; | |
21c3ba7e | 2300 | err = 0; |
f682a398 N |
2301 | out: |
2302 | rcu_read_unlock(); | |
2303 | return err; | |
2304 | } | |
2305 | ||
1c3c07e9 TM |
2306 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2307 | { | |
cfcea3e8 TM |
2308 | struct nfs_inode *nfsi = NFS_I(inode); |
2309 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2310 | struct rb_node **p = &root_node->rb_node; |
2311 | struct rb_node *parent = NULL; | |
2312 | struct nfs_access_entry *entry; | |
2313 | ||
2314 | spin_lock(&inode->i_lock); | |
2315 | while (*p != NULL) { | |
2316 | parent = *p; | |
2317 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
2318 | ||
2319 | if (set->cred < entry->cred) | |
2320 | p = &parent->rb_left; | |
2321 | else if (set->cred > entry->cred) | |
2322 | p = &parent->rb_right; | |
2323 | else | |
2324 | goto found; | |
2325 | } | |
2326 | rb_link_node(&set->rb_node, parent, p); | |
2327 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2328 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2329 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2330 | return; |
2331 | found: | |
2332 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2333 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2334 | list_del(&entry->lru); | |
1c3c07e9 TM |
2335 | spin_unlock(&inode->i_lock); |
2336 | nfs_access_free_entry(entry); | |
2337 | } | |
2338 | ||
6168f62c | 2339 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2340 | { |
2341 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2342 | if (cache == NULL) | |
2343 | return; | |
2344 | RB_CLEAR_NODE(&cache->rb_node); | |
1c3c07e9 | 2345 | cache->cred = get_rpccred(set->cred); |
1da177e4 | 2346 | cache->mask = set->mask; |
1c3c07e9 | 2347 | |
f682a398 N |
2348 | /* The above field assignments must be visible |
2349 | * before this item appears on the lru. We cannot easily | |
2350 | * use rcu_assign_pointer, so just force the memory barrier. | |
2351 | */ | |
2352 | smp_wmb(); | |
1c3c07e9 | 2353 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2354 | |
2355 | /* Update accounting */ | |
4e857c58 | 2356 | smp_mb__before_atomic(); |
cfcea3e8 | 2357 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2358 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2359 | |
2360 | /* Add inode to global LRU list */ | |
1a81bb8a | 2361 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2362 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2363 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2364 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2365 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2366 | spin_unlock(&nfs_access_lru_lock); |
2367 | } | |
3a505845 | 2368 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2369 | } |
6168f62c WAA |
2370 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2371 | ||
15d4b73a TM |
2372 | #define NFS_MAY_READ (NFS4_ACCESS_READ) |
2373 | #define NFS_MAY_WRITE (NFS4_ACCESS_MODIFY | \ | |
2374 | NFS4_ACCESS_EXTEND | \ | |
2375 | NFS4_ACCESS_DELETE) | |
ecbb903c TM |
2376 | #define NFS_FILE_MAY_WRITE (NFS4_ACCESS_MODIFY | \ |
2377 | NFS4_ACCESS_EXTEND) | |
2378 | #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE | |
15d4b73a TM |
2379 | #define NFS_MAY_LOOKUP (NFS4_ACCESS_LOOKUP) |
2380 | #define NFS_MAY_EXECUTE (NFS4_ACCESS_EXECUTE) | |
2381 | static int | |
ecbb903c | 2382 | nfs_access_calc_mask(u32 access_result, umode_t umode) |
15d4b73a TM |
2383 | { |
2384 | int mask = 0; | |
2385 | ||
2386 | if (access_result & NFS_MAY_READ) | |
2387 | mask |= MAY_READ; | |
ecbb903c TM |
2388 | if (S_ISDIR(umode)) { |
2389 | if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) | |
2390 | mask |= MAY_WRITE; | |
2391 | if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) | |
2392 | mask |= MAY_EXEC; | |
2393 | } else if (S_ISREG(umode)) { | |
2394 | if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) | |
2395 | mask |= MAY_WRITE; | |
2396 | if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) | |
2397 | mask |= MAY_EXEC; | |
2398 | } else if (access_result & NFS_MAY_WRITE) | |
2399 | mask |= MAY_WRITE; | |
15d4b73a TM |
2400 | return mask; |
2401 | } | |
2402 | ||
6168f62c WAA |
2403 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) |
2404 | { | |
bd8b2441 | 2405 | entry->mask = access_result; |
6168f62c WAA |
2406 | } |
2407 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 LT |
2408 | |
2409 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) | |
2410 | { | |
2411 | struct nfs_access_entry cache; | |
57b69181 | 2412 | bool may_block = (mask & MAY_NOT_BLOCK) == 0; |
bd8b2441 | 2413 | int cache_mask; |
1da177e4 LT |
2414 | int status; |
2415 | ||
f4ce1299 TM |
2416 | trace_nfs_access_enter(inode); |
2417 | ||
f682a398 N |
2418 | status = nfs_access_get_cached_rcu(inode, cred, &cache); |
2419 | if (status != 0) | |
57b69181 | 2420 | status = nfs_access_get_cached(inode, cred, &cache, may_block); |
1da177e4 | 2421 | if (status == 0) |
f4ce1299 | 2422 | goto out_cached; |
1da177e4 | 2423 | |
f3324a2a | 2424 | status = -ECHILD; |
57b69181 | 2425 | if (!may_block) |
f3324a2a N |
2426 | goto out; |
2427 | ||
1da177e4 | 2428 | /* Be clever: ask server to check for all possible rights */ |
bd8b2441 TM |
2429 | cache.mask = NFS_MAY_LOOKUP | NFS_MAY_EXECUTE |
2430 | | NFS_MAY_WRITE | NFS_MAY_READ; | |
1da177e4 | 2431 | cache.cred = cred; |
1da177e4 | 2432 | status = NFS_PROTO(inode)->access(inode, &cache); |
a71ee337 SJ |
2433 | if (status != 0) { |
2434 | if (status == -ESTALE) { | |
2435 | nfs_zap_caches(inode); | |
2436 | if (!S_ISDIR(inode->i_mode)) | |
2437 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2438 | } | |
f4ce1299 | 2439 | goto out; |
a71ee337 | 2440 | } |
1da177e4 | 2441 | nfs_access_add_cache(inode, &cache); |
f4ce1299 | 2442 | out_cached: |
ecbb903c | 2443 | cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); |
bd8b2441 | 2444 | if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) |
f4ce1299 | 2445 | status = -EACCES; |
1da177e4 | 2446 | out: |
f4ce1299 TM |
2447 | trace_nfs_access_exit(inode, status); |
2448 | return status; | |
1da177e4 LT |
2449 | } |
2450 | ||
af22f94a TM |
2451 | static int nfs_open_permission_mask(int openflags) |
2452 | { | |
2453 | int mask = 0; | |
2454 | ||
f8d9a897 WAA |
2455 | if (openflags & __FMODE_EXEC) { |
2456 | /* ONLY check exec rights */ | |
2457 | mask = MAY_EXEC; | |
2458 | } else { | |
2459 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2460 | mask |= MAY_READ; | |
2461 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2462 | mask |= MAY_WRITE; | |
2463 | } | |
2464 | ||
af22f94a TM |
2465 | return mask; |
2466 | } | |
2467 | ||
2468 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) | |
2469 | { | |
2470 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2471 | } | |
89d77c8f | 2472 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2473 | |
5c5fc09a TM |
2474 | static int nfs_execute_ok(struct inode *inode, int mask) |
2475 | { | |
2476 | struct nfs_server *server = NFS_SERVER(inode); | |
21c3ba7e | 2477 | int ret = 0; |
5c5fc09a | 2478 | |
21c3ba7e TM |
2479 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) { |
2480 | if (mask & MAY_NOT_BLOCK) | |
2481 | return -ECHILD; | |
2482 | ret = __nfs_revalidate_inode(server, inode); | |
2483 | } | |
5c5fc09a TM |
2484 | if (ret == 0 && !execute_ok(inode)) |
2485 | ret = -EACCES; | |
2486 | return ret; | |
2487 | } | |
2488 | ||
10556cb2 | 2489 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
2490 | { |
2491 | struct rpc_cred *cred; | |
2492 | int res = 0; | |
2493 | ||
91d5b470 CL |
2494 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2495 | ||
e6305c43 | 2496 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2497 | goto out; |
2498 | /* Is this sys_access() ? */ | |
9cfcac81 | 2499 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2500 | goto force_lookup; |
2501 | ||
2502 | switch (inode->i_mode & S_IFMT) { | |
2503 | case S_IFLNK: | |
2504 | goto out; | |
2505 | case S_IFREG: | |
762674f8 TM |
2506 | if ((mask & MAY_OPEN) && |
2507 | nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) | |
2508 | return 0; | |
1da177e4 LT |
2509 | break; |
2510 | case S_IFDIR: | |
2511 | /* | |
2512 | * Optimize away all write operations, since the server | |
2513 | * will check permissions when we perform the op. | |
2514 | */ | |
2515 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2516 | goto out; | |
2517 | } | |
2518 | ||
2519 | force_lookup: | |
1da177e4 LT |
2520 | if (!NFS_PROTO(inode)->access) |
2521 | goto out_notsup; | |
2522 | ||
f3324a2a N |
2523 | /* Always try fast lookups first */ |
2524 | rcu_read_lock(); | |
2525 | cred = rpc_lookup_cred_nonblock(); | |
2526 | if (!IS_ERR(cred)) | |
2527 | res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK); | |
2528 | else | |
1da177e4 | 2529 | res = PTR_ERR(cred); |
f3324a2a N |
2530 | rcu_read_unlock(); |
2531 | if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) { | |
2532 | /* Fast lookup failed, try the slow way */ | |
2533 | cred = rpc_lookup_cred(); | |
2534 | if (!IS_ERR(cred)) { | |
2535 | res = nfs_do_access(inode, cred, mask); | |
2536 | put_rpccred(cred); | |
2537 | } else | |
2538 | res = PTR_ERR(cred); | |
2539 | } | |
1da177e4 | 2540 | out: |
5c5fc09a TM |
2541 | if (!res && (mask & MAY_EXEC)) |
2542 | res = nfs_execute_ok(inode, mask); | |
f696a365 | 2543 | |
1e8968c5 | 2544 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2545 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2546 | return res; |
2547 | out_notsup: | |
d51ac1a8 N |
2548 | if (mask & MAY_NOT_BLOCK) |
2549 | return -ECHILD; | |
2550 | ||
1da177e4 LT |
2551 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
2552 | if (res == 0) | |
2830ba7f | 2553 | res = generic_permission(inode, mask); |
1e7cb3dc | 2554 | goto out; |
1da177e4 | 2555 | } |
ddda8e0a | 2556 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2557 | |
2558 | /* | |
2559 | * Local variables: | |
2560 | * version-control: t | |
2561 | * kept-new-versions: 5 | |
2562 | * End: | |
2563 | */ |