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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/dir.c | |
4 | * | |
5 | * Copyright (C) 1992 Rick Sladkey | |
6 | * | |
7 | * nfs directory handling functions | |
8 | * | |
9 | * 10 Apr 1996 Added silly rename for unlink --okir | |
10 | * 28 Sep 1996 Improved directory cache --okir | |
11 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de | |
12 | * Re-implemented silly rename for unlink, newly implemented | |
13 | * silly rename for nfs_rename() following the suggestions | |
14 | * of Olaf Kirch (okir) found in this file. | |
15 | * Following Linus comments on my original hack, this version | |
16 | * depends only on the dcache stuff and doesn't touch the inode | |
17 | * layer (iput() and friends). | |
18 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM | |
19 | */ | |
20 | ||
ddda8e0a | 21 | #include <linux/module.h> |
1da177e4 LT |
22 | #include <linux/time.h> |
23 | #include <linux/errno.h> | |
24 | #include <linux/stat.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/sunrpc/clnt.h> | |
31 | #include <linux/nfs_fs.h> | |
32 | #include <linux/nfs_mount.h> | |
33 | #include <linux/pagemap.h> | |
873101b3 | 34 | #include <linux/pagevec.h> |
1da177e4 | 35 | #include <linux/namei.h> |
54ceac45 | 36 | #include <linux/mount.h> |
a0b8cab3 | 37 | #include <linux/swap.h> |
e8edc6e0 | 38 | #include <linux/sched.h> |
04e4bd1c | 39 | #include <linux/kmemleak.h> |
64c2ce8b | 40 | #include <linux/xattr.h> |
1da177e4 LT |
41 | |
42 | #include "delegation.h" | |
91d5b470 | 43 | #include "iostat.h" |
4c30d56e | 44 | #include "internal.h" |
cd9a1c0e | 45 | #include "fscache.h" |
1da177e4 | 46 | |
f4ce1299 TM |
47 | #include "nfstrace.h" |
48 | ||
1da177e4 LT |
49 | /* #define NFS_DEBUG_VERBOSE 1 */ |
50 | ||
51 | static int nfs_opendir(struct inode *, struct file *); | |
480c2006 | 52 | static int nfs_closedir(struct inode *, struct file *); |
23db8620 | 53 | static int nfs_readdir(struct file *, struct dir_context *); |
02c24a82 | 54 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
f0dd2136 | 55 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
11de3b11 | 56 | static void nfs_readdir_clear_array(struct page*); |
1da177e4 | 57 | |
4b6f5d20 | 58 | const struct file_operations nfs_dir_operations = { |
f0dd2136 | 59 | .llseek = nfs_llseek_dir, |
1da177e4 | 60 | .read = generic_read_dir, |
b044f645 | 61 | .iterate = nfs_readdir, |
1da177e4 | 62 | .open = nfs_opendir, |
480c2006 | 63 | .release = nfs_closedir, |
1da177e4 LT |
64 | .fsync = nfs_fsync_dir, |
65 | }; | |
66 | ||
11de3b11 TM |
67 | const struct address_space_operations nfs_dir_aops = { |
68 | .freepage = nfs_readdir_clear_array, | |
d1bacf9e BS |
69 | }; |
70 | ||
684f39b4 | 71 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, const struct cred *cred) |
480c2006 | 72 | { |
311324ad | 73 | struct nfs_inode *nfsi = NFS_I(dir); |
480c2006 BS |
74 | struct nfs_open_dir_context *ctx; |
75 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
76 | if (ctx != NULL) { | |
8ef2ce3e | 77 | ctx->duped = 0; |
311324ad | 78 | ctx->attr_gencount = nfsi->attr_gencount; |
480c2006 | 79 | ctx->dir_cookie = 0; |
8ef2ce3e | 80 | ctx->dup_cookie = 0; |
684f39b4 | 81 | ctx->cred = get_cred(cred); |
311324ad TM |
82 | spin_lock(&dir->i_lock); |
83 | list_add(&ctx->list, &nfsi->open_files); | |
84 | spin_unlock(&dir->i_lock); | |
0c030806 TM |
85 | return ctx; |
86 | } | |
87 | return ERR_PTR(-ENOMEM); | |
480c2006 BS |
88 | } |
89 | ||
311324ad | 90 | static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) |
480c2006 | 91 | { |
311324ad TM |
92 | spin_lock(&dir->i_lock); |
93 | list_del(&ctx->list); | |
94 | spin_unlock(&dir->i_lock); | |
684f39b4 | 95 | put_cred(ctx->cred); |
480c2006 BS |
96 | kfree(ctx); |
97 | } | |
98 | ||
1da177e4 LT |
99 | /* |
100 | * Open file | |
101 | */ | |
102 | static int | |
103 | nfs_opendir(struct inode *inode, struct file *filp) | |
104 | { | |
480c2006 BS |
105 | int res = 0; |
106 | struct nfs_open_dir_context *ctx; | |
1da177e4 | 107 | |
6de1472f | 108 | dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); |
cc0dd2d1 CL |
109 | |
110 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); | |
1e7cb3dc | 111 | |
684f39b4 | 112 | ctx = alloc_nfs_open_dir_context(inode, current_cred()); |
480c2006 BS |
113 | if (IS_ERR(ctx)) { |
114 | res = PTR_ERR(ctx); | |
115 | goto out; | |
116 | } | |
117 | filp->private_data = ctx; | |
480c2006 | 118 | out: |
1da177e4 LT |
119 | return res; |
120 | } | |
121 | ||
480c2006 BS |
122 | static int |
123 | nfs_closedir(struct inode *inode, struct file *filp) | |
124 | { | |
a455589f | 125 | put_nfs_open_dir_context(file_inode(filp), filp->private_data); |
480c2006 BS |
126 | return 0; |
127 | } | |
128 | ||
d1bacf9e BS |
129 | struct nfs_cache_array_entry { |
130 | u64 cookie; | |
131 | u64 ino; | |
132 | struct qstr string; | |
0b26a0bf | 133 | unsigned char d_type; |
d1bacf9e BS |
134 | }; |
135 | ||
136 | struct nfs_cache_array { | |
88b8e133 | 137 | int size; |
d1bacf9e BS |
138 | int eof_index; |
139 | u64 last_cookie; | |
140 | struct nfs_cache_array_entry array[0]; | |
141 | }; | |
142 | ||
be4c2d47 | 143 | struct readdirvec { |
144 | unsigned long nr; | |
145 | unsigned long index; | |
146 | struct page *pages[NFS_MAX_READDIR_RAPAGES]; | |
147 | }; | |
148 | ||
a7a3b1e9 | 149 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, bool); |
1da177e4 LT |
150 | typedef struct { |
151 | struct file *file; | |
152 | struct page *page; | |
23db8620 | 153 | struct dir_context *ctx; |
1da177e4 | 154 | unsigned long page_index; |
be4c2d47 | 155 | struct readdirvec pvec; |
f0dd2136 | 156 | u64 *dir_cookie; |
0aded708 | 157 | u64 last_cookie; |
f0dd2136 | 158 | loff_t current_index; |
1da177e4 | 159 | decode_dirent_t decode; |
d1bacf9e | 160 | |
1f4eab7e | 161 | unsigned long timestamp; |
4704f0e2 | 162 | unsigned long gencount; |
d1bacf9e | 163 | unsigned int cache_entry_index; |
a7a3b1e9 BC |
164 | bool plus; |
165 | bool eof; | |
1da177e4 LT |
166 | } nfs_readdir_descriptor_t; |
167 | ||
d1bacf9e BS |
168 | /* |
169 | * we are freeing strings created by nfs_add_to_readdir_array() | |
170 | */ | |
171 | static | |
11de3b11 | 172 | void nfs_readdir_clear_array(struct page *page) |
d1bacf9e | 173 | { |
11de3b11 | 174 | struct nfs_cache_array *array; |
d1bacf9e | 175 | int i; |
8cd51a0c | 176 | |
2b86ce2d | 177 | array = kmap_atomic(page); |
b044f645 BC |
178 | for (i = 0; i < array->size; i++) |
179 | kfree(array->array[i].string.name); | |
2b86ce2d | 180 | kunmap_atomic(array); |
d1bacf9e BS |
181 | } |
182 | ||
183 | /* | |
184 | * the caller is responsible for freeing qstr.name | |
185 | * when called by nfs_readdir_add_to_array, the strings will be freed in | |
186 | * nfs_clear_readdir_array() | |
187 | */ | |
188 | static | |
4a201d6e | 189 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
d1bacf9e BS |
190 | { |
191 | string->len = len; | |
192 | string->name = kmemdup(name, len, GFP_KERNEL); | |
4a201d6e TM |
193 | if (string->name == NULL) |
194 | return -ENOMEM; | |
04e4bd1c CM |
195 | /* |
196 | * Avoid a kmemleak false positive. The pointer to the name is stored | |
197 | * in a page cache page which kmemleak does not scan. | |
198 | */ | |
199 | kmemleak_not_leak(string->name); | |
8387ff25 | 200 | string->hash = full_name_hash(NULL, name, len); |
4a201d6e | 201 | return 0; |
d1bacf9e BS |
202 | } |
203 | ||
204 | static | |
205 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) | |
206 | { | |
0795bf83 | 207 | struct nfs_cache_array *array = kmap(page); |
4a201d6e TM |
208 | struct nfs_cache_array_entry *cache_entry; |
209 | int ret; | |
210 | ||
3020093f TM |
211 | cache_entry = &array->array[array->size]; |
212 | ||
213 | /* Check that this entry lies within the page bounds */ | |
8cd51a0c | 214 | ret = -ENOSPC; |
3020093f | 215 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
4a201d6e | 216 | goto out; |
d1bacf9e | 217 | |
4a201d6e TM |
218 | cache_entry->cookie = entry->prev_cookie; |
219 | cache_entry->ino = entry->ino; | |
0b26a0bf | 220 | cache_entry->d_type = entry->d_type; |
4a201d6e TM |
221 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
222 | if (ret) | |
223 | goto out; | |
d1bacf9e | 224 | array->last_cookie = entry->cookie; |
8cd51a0c | 225 | array->size++; |
47c716cb | 226 | if (entry->eof != 0) |
d1bacf9e | 227 | array->eof_index = array->size; |
4a201d6e | 228 | out: |
0795bf83 | 229 | kunmap(page); |
4a201d6e | 230 | return ret; |
d1bacf9e BS |
231 | } |
232 | ||
233 | static | |
234 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
235 | { | |
23db8620 | 236 | loff_t diff = desc->ctx->pos - desc->current_index; |
d1bacf9e BS |
237 | unsigned int index; |
238 | ||
239 | if (diff < 0) | |
240 | goto out_eof; | |
241 | if (diff >= array->size) { | |
8cd51a0c | 242 | if (array->eof_index >= 0) |
d1bacf9e | 243 | goto out_eof; |
d1bacf9e BS |
244 | return -EAGAIN; |
245 | } | |
246 | ||
247 | index = (unsigned int)diff; | |
248 | *desc->dir_cookie = array->array[index].cookie; | |
249 | desc->cache_entry_index = index; | |
d1bacf9e BS |
250 | return 0; |
251 | out_eof: | |
6089dd0d | 252 | desc->eof = true; |
d1bacf9e BS |
253 | return -EBADCOOKIE; |
254 | } | |
255 | ||
4db72b40 JL |
256 | static bool |
257 | nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) | |
258 | { | |
259 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) | |
260 | return false; | |
261 | smp_rmb(); | |
262 | return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); | |
263 | } | |
264 | ||
d1bacf9e BS |
265 | static |
266 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) | |
267 | { | |
268 | int i; | |
8ef2ce3e | 269 | loff_t new_pos; |
d1bacf9e BS |
270 | int status = -EAGAIN; |
271 | ||
272 | for (i = 0; i < array->size; i++) { | |
d1bacf9e | 273 | if (array->array[i].cookie == *desc->dir_cookie) { |
496ad9aa | 274 | struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); |
0c030806 TM |
275 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
276 | ||
8ef2ce3e | 277 | new_pos = desc->current_index + i; |
4db72b40 JL |
278 | if (ctx->attr_gencount != nfsi->attr_gencount || |
279 | !nfs_readdir_inode_mapping_valid(nfsi)) { | |
0c030806 TM |
280 | ctx->duped = 0; |
281 | ctx->attr_gencount = nfsi->attr_gencount; | |
23db8620 | 282 | } else if (new_pos < desc->ctx->pos) { |
0c030806 TM |
283 | if (ctx->duped > 0 |
284 | && ctx->dup_cookie == *desc->dir_cookie) { | |
285 | if (printk_ratelimit()) { | |
6de1472f | 286 | pr_notice("NFS: directory %pD2 contains a readdir loop." |
0c030806 | 287 | "Please contact your server vendor. " |
9581a4ae JL |
288 | "The file: %.*s has duplicate cookie %llu\n", |
289 | desc->file, array->array[i].string.len, | |
290 | array->array[i].string.name, *desc->dir_cookie); | |
0c030806 TM |
291 | } |
292 | status = -ELOOP; | |
293 | goto out; | |
294 | } | |
8ef2ce3e | 295 | ctx->dup_cookie = *desc->dir_cookie; |
0c030806 | 296 | ctx->duped = -1; |
8ef2ce3e | 297 | } |
23db8620 | 298 | desc->ctx->pos = new_pos; |
d1bacf9e | 299 | desc->cache_entry_index = i; |
47c716cb | 300 | return 0; |
d1bacf9e BS |
301 | } |
302 | } | |
47c716cb | 303 | if (array->eof_index >= 0) { |
8cd51a0c | 304 | status = -EBADCOOKIE; |
18fb5fe4 | 305 | if (*desc->dir_cookie == array->last_cookie) |
6089dd0d | 306 | desc->eof = true; |
8cd51a0c | 307 | } |
0c030806 | 308 | out: |
d1bacf9e BS |
309 | return status; |
310 | } | |
311 | ||
312 | static | |
313 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) | |
314 | { | |
315 | struct nfs_cache_array *array; | |
47c716cb | 316 | int status; |
d1bacf9e | 317 | |
0795bf83 | 318 | array = kmap(desc->page); |
d1bacf9e BS |
319 | |
320 | if (*desc->dir_cookie == 0) | |
321 | status = nfs_readdir_search_for_pos(array, desc); | |
322 | else | |
323 | status = nfs_readdir_search_for_cookie(array, desc); | |
324 | ||
47c716cb | 325 | if (status == -EAGAIN) { |
0aded708 | 326 | desc->last_cookie = array->last_cookie; |
e47c085a | 327 | desc->current_index += array->size; |
47c716cb TM |
328 | desc->page_index++; |
329 | } | |
0795bf83 | 330 | kunmap(desc->page); |
d1bacf9e BS |
331 | return status; |
332 | } | |
333 | ||
334 | /* Fill a page with xdr information before transferring to the cache page */ | |
335 | static | |
56e4ebf8 | 336 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
d1bacf9e | 337 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
1da177e4 | 338 | { |
480c2006 | 339 | struct nfs_open_dir_context *ctx = file->private_data; |
684f39b4 | 340 | const struct cred *cred = ctx->cred; |
4704f0e2 | 341 | unsigned long timestamp, gencount; |
1da177e4 LT |
342 | int error; |
343 | ||
1da177e4 LT |
344 | again: |
345 | timestamp = jiffies; | |
4704f0e2 | 346 | gencount = nfs_inc_attr_generation_counter(); |
be62a1a8 | 347 | error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages, |
1da177e4 LT |
348 | NFS_SERVER(inode)->dtsize, desc->plus); |
349 | if (error < 0) { | |
350 | /* We requested READDIRPLUS, but the server doesn't grok it */ | |
351 | if (error == -ENOTSUPP && desc->plus) { | |
352 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; | |
3a10c30a | 353 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
a7a3b1e9 | 354 | desc->plus = false; |
1da177e4 LT |
355 | goto again; |
356 | } | |
357 | goto error; | |
358 | } | |
1f4eab7e | 359 | desc->timestamp = timestamp; |
4704f0e2 | 360 | desc->gencount = gencount; |
d1bacf9e BS |
361 | error: |
362 | return error; | |
1da177e4 LT |
363 | } |
364 | ||
573c4e1e CL |
365 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
366 | struct nfs_entry *entry, struct xdr_stream *xdr) | |
1da177e4 | 367 | { |
573c4e1e | 368 | int error; |
1da177e4 | 369 | |
573c4e1e CL |
370 | error = desc->decode(xdr, entry, desc->plus); |
371 | if (error) | |
372 | return error; | |
d1bacf9e BS |
373 | entry->fattr->time_start = desc->timestamp; |
374 | entry->fattr->gencount = desc->gencount; | |
375 | return 0; | |
1da177e4 LT |
376 | } |
377 | ||
fa923369 TM |
378 | /* Match file and dirent using either filehandle or fileid |
379 | * Note: caller is responsible for checking the fsid | |
380 | */ | |
d39ab9de BS |
381 | static |
382 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) | |
383 | { | |
d8fdb47f | 384 | struct inode *inode; |
fa923369 TM |
385 | struct nfs_inode *nfsi; |
386 | ||
2b0143b5 DH |
387 | if (d_really_is_negative(dentry)) |
388 | return 0; | |
fa923369 | 389 | |
d8fdb47f TM |
390 | inode = d_inode(dentry); |
391 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
392 | return 0; | |
393 | ||
394 | nfsi = NFS_I(inode); | |
7dc72d5f TM |
395 | if (entry->fattr->fileid != nfsi->fileid) |
396 | return 0; | |
397 | if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) | |
398 | return 0; | |
399 | return 1; | |
d39ab9de BS |
400 | } |
401 | ||
d69ee9b8 | 402 | static |
23db8620 | 403 | bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
d69ee9b8 TM |
404 | { |
405 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) | |
406 | return false; | |
407 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) | |
408 | return true; | |
23db8620 | 409 | if (ctx->pos == 0) |
d69ee9b8 TM |
410 | return true; |
411 | return false; | |
412 | } | |
413 | ||
414 | /* | |
63519fbc TM |
415 | * This function is called by the lookup and getattr code to request the |
416 | * use of readdirplus to accelerate any future lookups in the same | |
d69ee9b8 TM |
417 | * directory. |
418 | */ | |
d69ee9b8 TM |
419 | void nfs_advise_use_readdirplus(struct inode *dir) |
420 | { | |
63519fbc TM |
421 | struct nfs_inode *nfsi = NFS_I(dir); |
422 | ||
423 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
424 | !list_empty(&nfsi->open_files)) | |
425 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
d69ee9b8 TM |
426 | } |
427 | ||
311324ad TM |
428 | /* |
429 | * This function is mainly for use by nfs_getattr(). | |
430 | * | |
431 | * If this is an 'ls -l', we want to force use of readdirplus. | |
432 | * Do this by checking if there is an active file descriptor | |
433 | * and calling nfs_advise_use_readdirplus, then forcing a | |
434 | * cache flush. | |
435 | */ | |
436 | void nfs_force_use_readdirplus(struct inode *dir) | |
437 | { | |
63519fbc TM |
438 | struct nfs_inode *nfsi = NFS_I(dir); |
439 | ||
440 | if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && | |
441 | !list_empty(&nfsi->open_files)) { | |
442 | set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); | |
79f687a3 | 443 | invalidate_mapping_pages(dir->i_mapping, 0, -1); |
311324ad TM |
444 | } |
445 | } | |
446 | ||
d39ab9de BS |
447 | static |
448 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) | |
449 | { | |
26fe5750 | 450 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
9ac3d3e8 | 451 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
4a201d6e TM |
452 | struct dentry *dentry; |
453 | struct dentry *alias; | |
2b0143b5 | 454 | struct inode *dir = d_inode(parent); |
d39ab9de | 455 | struct inode *inode; |
aa9c2669 | 456 | int status; |
d39ab9de | 457 | |
fa923369 TM |
458 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) |
459 | return; | |
6c441c25 TM |
460 | if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) |
461 | return; | |
78d04af4 TM |
462 | if (filename.len == 0) |
463 | return; | |
464 | /* Validate that the name doesn't contain any illegal '\0' */ | |
465 | if (strnlen(filename.name, filename.len) != filename.len) | |
466 | return; | |
467 | /* ...or '/' */ | |
468 | if (strnchr(filename.name, filename.len, '/')) | |
469 | return; | |
4a201d6e TM |
470 | if (filename.name[0] == '.') { |
471 | if (filename.len == 1) | |
472 | return; | |
473 | if (filename.len == 2 && filename.name[1] == '.') | |
474 | return; | |
475 | } | |
8387ff25 | 476 | filename.hash = full_name_hash(parent, filename.name, filename.len); |
d39ab9de | 477 | |
4a201d6e | 478 | dentry = d_lookup(parent, &filename); |
9ac3d3e8 AV |
479 | again: |
480 | if (!dentry) { | |
481 | dentry = d_alloc_parallel(parent, &filename, &wq); | |
482 | if (IS_ERR(dentry)) | |
483 | return; | |
484 | } | |
485 | if (!d_in_lookup(dentry)) { | |
6c441c25 TM |
486 | /* Is there a mountpoint here? If so, just exit */ |
487 | if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, | |
488 | &entry->fattr->fsid)) | |
489 | goto out; | |
d39ab9de | 490 | if (nfs_same_file(dentry, entry)) { |
7dc72d5f TM |
491 | if (!entry->fh->size) |
492 | goto out; | |
cda57a1e | 493 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
2b0143b5 | 494 | status = nfs_refresh_inode(d_inode(dentry), entry->fattr); |
aa9c2669 | 495 | if (!status) |
2b0143b5 | 496 | nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); |
d39ab9de BS |
497 | goto out; |
498 | } else { | |
5542aa2f | 499 | d_invalidate(dentry); |
d39ab9de | 500 | dput(dentry); |
9ac3d3e8 AV |
501 | dentry = NULL; |
502 | goto again; | |
d39ab9de BS |
503 | } |
504 | } | |
7dc72d5f TM |
505 | if (!entry->fh->size) { |
506 | d_lookup_done(dentry); | |
507 | goto out; | |
508 | } | |
d39ab9de | 509 | |
1775fd3e | 510 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); |
41d28bca | 511 | alias = d_splice_alias(inode, dentry); |
9ac3d3e8 AV |
512 | d_lookup_done(dentry); |
513 | if (alias) { | |
514 | if (IS_ERR(alias)) | |
515 | goto out; | |
516 | dput(dentry); | |
517 | dentry = alias; | |
518 | } | |
519 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
d39ab9de BS |
520 | out: |
521 | dput(dentry); | |
d39ab9de BS |
522 | } |
523 | ||
d1bacf9e BS |
524 | /* Perform conversion from xdr to cache array */ |
525 | static | |
8cd51a0c | 526 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
6650239a | 527 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
1da177e4 | 528 | { |
babddc72 | 529 | struct xdr_stream stream; |
f7da7a12 | 530 | struct xdr_buf buf; |
6650239a | 531 | struct page *scratch; |
99424380 | 532 | struct nfs_cache_array *array; |
5c346854 TM |
533 | unsigned int count = 0; |
534 | int status; | |
be4c2d47 | 535 | int max_rapages = NFS_MAX_READDIR_RAPAGES; |
536 | ||
537 | desc->pvec.index = desc->page_index; | |
538 | desc->pvec.nr = 0; | |
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 | 562 | |
be4c2d47 | 563 | status = nfs_readdir_add_to_array(entry, desc->pvec.pages[desc->pvec.nr]); |
564 | if (status == -ENOSPC) { | |
565 | desc->pvec.nr++; | |
566 | if (desc->pvec.nr == max_rapages) | |
567 | break; | |
568 | status = nfs_readdir_add_to_array(entry, desc->pvec.pages[desc->pvec.nr]); | |
569 | } | |
8cd51a0c TM |
570 | if (status != 0) |
571 | break; | |
99424380 BS |
572 | } while (!entry->eof); |
573 | ||
be4c2d47 | 574 | /* |
575 | * page and desc->pvec.pages[0] are valid, don't need to check | |
576 | * whether or not to be NULL. | |
577 | */ | |
578 | copy_highpage(page, desc->pvec.pages[0]); | |
579 | ||
ce85cfbe | 580 | out_nopages: |
47c716cb | 581 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
be4c2d47 | 582 | array = kmap_atomic(desc->pvec.pages[desc->pvec.nr]); |
0795bf83 FF |
583 | array->eof_index = array->size; |
584 | status = 0; | |
be4c2d47 | 585 | kunmap_atomic(array); |
1da177e4 | 586 | } |
6650239a TM |
587 | |
588 | put_page(scratch); | |
be4c2d47 | 589 | |
590 | /* | |
591 | * desc->pvec.nr > 0 means at least one page was completely filled, | |
592 | * we should return -ENOSPC. Otherwise function | |
593 | * nfs_readdir_xdr_to_array will enter infinite loop. | |
594 | */ | |
595 | if (desc->pvec.nr > 0) | |
596 | return -ENOSPC; | |
8cd51a0c | 597 | return status; |
56e4ebf8 BS |
598 | } |
599 | ||
600 | static | |
c7e9668e | 601 | void nfs_readdir_free_pages(struct page **pages, unsigned int npages) |
56e4ebf8 BS |
602 | { |
603 | unsigned int i; | |
604 | for (i = 0; i < npages; i++) | |
605 | put_page(pages[i]); | |
606 | } | |
607 | ||
56e4ebf8 | 608 | /* |
bf211ca1 | 609 | * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call |
610 | * to nfs_readdir_free_pages() | |
56e4ebf8 BS |
611 | */ |
612 | static | |
c7e9668e | 613 | int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages) |
56e4ebf8 | 614 | { |
56e4ebf8 BS |
615 | unsigned int i; |
616 | ||
617 | for (i = 0; i < npages; i++) { | |
618 | struct page *page = alloc_page(GFP_KERNEL); | |
619 | if (page == NULL) | |
620 | goto out_freepages; | |
621 | pages[i] = page; | |
622 | } | |
6650239a | 623 | return 0; |
56e4ebf8 | 624 | |
56e4ebf8 | 625 | out_freepages: |
c7e9668e | 626 | nfs_readdir_free_pages(pages, i); |
6650239a | 627 | return -ENOMEM; |
1da177e4 LT |
628 | } |
629 | ||
be4c2d47 | 630 | /* |
631 | * nfs_readdir_rapages_init initialize rapages by nfs_cache_array structure. | |
632 | */ | |
633 | static | |
634 | void nfs_readdir_rapages_init(nfs_readdir_descriptor_t *desc) | |
635 | { | |
636 | struct nfs_cache_array *array; | |
637 | int max_rapages = NFS_MAX_READDIR_RAPAGES; | |
638 | int index; | |
639 | ||
640 | for (index = 0; index < max_rapages; index++) { | |
641 | array = kmap_atomic(desc->pvec.pages[index]); | |
642 | memset(array, 0, sizeof(struct nfs_cache_array)); | |
643 | array->eof_index = -1; | |
644 | kunmap_atomic(array); | |
645 | } | |
646 | } | |
647 | ||
d1bacf9e BS |
648 | static |
649 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) | |
00a92642 | 650 | { |
56e4ebf8 | 651 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
d1bacf9e BS |
652 | struct nfs_entry entry; |
653 | struct file *file = desc->file; | |
654 | struct nfs_cache_array *array; | |
8cd51a0c | 655 | int status = -ENOMEM; |
56e4ebf8 | 656 | unsigned int array_size = ARRAY_SIZE(pages); |
d1bacf9e | 657 | |
be4c2d47 | 658 | /* |
659 | * This means we hit readdir rdpages miss, the preallocated rdpages | |
660 | * are useless, the preallocate rdpages should be reinitialized. | |
661 | */ | |
662 | nfs_readdir_rapages_init(desc); | |
663 | ||
d1bacf9e | 664 | entry.prev_cookie = 0; |
0aded708 | 665 | entry.cookie = desc->last_cookie; |
d1bacf9e BS |
666 | entry.eof = 0; |
667 | entry.fh = nfs_alloc_fhandle(); | |
668 | entry.fattr = nfs_alloc_fattr(); | |
573c4e1e | 669 | entry.server = NFS_SERVER(inode); |
d1bacf9e BS |
670 | if (entry.fh == NULL || entry.fattr == NULL) |
671 | goto out; | |
00a92642 | 672 | |
14c43f76 DQ |
673 | entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); |
674 | if (IS_ERR(entry.label)) { | |
675 | status = PTR_ERR(entry.label); | |
676 | goto out; | |
677 | } | |
678 | ||
0795bf83 | 679 | array = kmap(page); |
d1bacf9e BS |
680 | memset(array, 0, sizeof(struct nfs_cache_array)); |
681 | array->eof_index = -1; | |
00a92642 | 682 | |
c7e9668e | 683 | status = nfs_readdir_alloc_pages(pages, array_size); |
6650239a | 684 | if (status < 0) |
d1bacf9e BS |
685 | goto out_release_array; |
686 | do { | |
ac396128 | 687 | unsigned int pglen; |
56e4ebf8 | 688 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
babddc72 | 689 | |
d1bacf9e | 690 | if (status < 0) |
00a92642 | 691 | break; |
ac396128 | 692 | pglen = status; |
6650239a | 693 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
8cd51a0c TM |
694 | if (status < 0) { |
695 | if (status == -ENOSPC) | |
696 | status = 0; | |
697 | break; | |
698 | } | |
699 | } while (array->eof_index < 0); | |
d1bacf9e | 700 | |
c7e9668e | 701 | nfs_readdir_free_pages(pages, array_size); |
d1bacf9e | 702 | out_release_array: |
0795bf83 | 703 | kunmap(page); |
14c43f76 | 704 | nfs4_label_free(entry.label); |
d1bacf9e BS |
705 | out: |
706 | nfs_free_fattr(entry.fattr); | |
707 | nfs_free_fhandle(entry.fh); | |
00a92642 OG |
708 | return status; |
709 | } | |
710 | ||
711 | /* | |
d1bacf9e BS |
712 | * Now we cache directories properly, by converting xdr information |
713 | * to an array that can be used for lookups later. This results in | |
714 | * fewer cache pages, since we can store more information on each page. | |
715 | * We only need to convert from xdr once so future lookups are much simpler | |
1da177e4 | 716 | */ |
d1bacf9e | 717 | static |
a46126cc | 718 | int nfs_readdir_filler(void *data, struct page* page) |
1da177e4 | 719 | { |
a46126cc | 720 | nfs_readdir_descriptor_t *desc = data; |
496ad9aa | 721 | struct inode *inode = file_inode(desc->file); |
8cd51a0c | 722 | int ret; |
1da177e4 | 723 | |
be4c2d47 | 724 | /* |
725 | * If desc->page_index in range desc->pvec.index and | |
726 | * desc->pvec.index + desc->pvec.nr, we get readdir cache hit. | |
727 | */ | |
728 | if (desc->page_index >= desc->pvec.index && | |
729 | desc->page_index < (desc->pvec.index + desc->pvec.nr)) { | |
730 | /* | |
731 | * page and desc->pvec.pages[x] are valid, don't need to check | |
732 | * whether or not to be NULL. | |
733 | */ | |
734 | copy_highpage(page, desc->pvec.pages[desc->page_index - desc->pvec.index]); | |
735 | ret = 0; | |
736 | } else { | |
737 | ret = nfs_readdir_xdr_to_array(desc, page, inode); | |
738 | if (ret < 0) | |
739 | goto error; | |
740 | } | |
741 | ||
d1bacf9e | 742 | SetPageUptodate(page); |
1da177e4 | 743 | |
d1bacf9e BS |
744 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
745 | /* Should never happen */ | |
746 | nfs_zap_mapping(inode, inode->i_mapping); | |
1da177e4 | 747 | } |
d1bacf9e BS |
748 | unlock_page(page); |
749 | return 0; | |
750 | error: | |
751 | unlock_page(page); | |
8cd51a0c | 752 | return ret; |
d1bacf9e | 753 | } |
1da177e4 | 754 | |
d1bacf9e BS |
755 | static |
756 | void cache_page_release(nfs_readdir_descriptor_t *desc) | |
757 | { | |
b044f645 BC |
758 | if (!desc->page->mapping) |
759 | nfs_readdir_clear_array(desc->page); | |
09cbfeaf | 760 | put_page(desc->page); |
d1bacf9e BS |
761 | desc->page = NULL; |
762 | } | |
763 | ||
764 | static | |
765 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) | |
766 | { | |
a46126cc CH |
767 | return read_cache_page(desc->file->f_mapping, desc->page_index, |
768 | nfs_readdir_filler, desc); | |
1da177e4 LT |
769 | } |
770 | ||
771 | /* | |
d1bacf9e | 772 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
1da177e4 | 773 | */ |
d1bacf9e BS |
774 | static |
775 | int find_cache_page(nfs_readdir_descriptor_t *desc) | |
776 | { | |
777 | int res; | |
778 | ||
779 | desc->page = get_cache_page(desc); | |
780 | if (IS_ERR(desc->page)) | |
781 | return PTR_ERR(desc->page); | |
782 | ||
783 | res = nfs_readdir_search_array(desc); | |
47c716cb TM |
784 | if (res != 0) |
785 | cache_page_release(desc); | |
d1bacf9e BS |
786 | return res; |
787 | } | |
788 | ||
789 | /* Search for desc->dir_cookie from the beginning of the page cache */ | |
1da177e4 LT |
790 | static inline |
791 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) | |
792 | { | |
8cd51a0c | 793 | int res; |
d1bacf9e | 794 | |
0aded708 | 795 | if (desc->page_index == 0) { |
8cd51a0c | 796 | desc->current_index = 0; |
0aded708 TM |
797 | desc->last_cookie = 0; |
798 | } | |
47c716cb | 799 | do { |
d1bacf9e | 800 | res = find_cache_page(desc); |
47c716cb | 801 | } while (res == -EAGAIN); |
1da177e4 LT |
802 | return res; |
803 | } | |
804 | ||
1da177e4 LT |
805 | /* |
806 | * Once we've found the start of the dirent within a page: fill 'er up... | |
807 | */ | |
808 | static | |
23db8620 | 809 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc) |
1da177e4 LT |
810 | { |
811 | struct file *file = desc->file; | |
d1bacf9e BS |
812 | int i = 0; |
813 | int res = 0; | |
814 | struct nfs_cache_array *array = NULL; | |
8ef2ce3e BS |
815 | struct nfs_open_dir_context *ctx = file->private_data; |
816 | ||
0795bf83 | 817 | array = kmap(desc->page); |
d1bacf9e | 818 | for (i = desc->cache_entry_index; i < array->size; i++) { |
ece0b423 | 819 | struct nfs_cache_array_entry *ent; |
1da177e4 | 820 | |
ece0b423 | 821 | ent = &array->array[i]; |
23db8620 AV |
822 | if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, |
823 | nfs_compat_user_ino64(ent->ino), ent->d_type)) { | |
6089dd0d | 824 | desc->eof = true; |
1da177e4 | 825 | break; |
ece0b423 | 826 | } |
23db8620 | 827 | desc->ctx->pos++; |
d1bacf9e BS |
828 | if (i < (array->size-1)) |
829 | *desc->dir_cookie = array->array[i+1].cookie; | |
830 | else | |
831 | *desc->dir_cookie = array->last_cookie; | |
0c030806 TM |
832 | if (ctx->duped != 0) |
833 | ctx->duped = 1; | |
1da177e4 | 834 | } |
47c716cb | 835 | if (array->eof_index >= 0) |
6089dd0d | 836 | desc->eof = true; |
d1bacf9e | 837 | |
0795bf83 | 838 | kunmap(desc->page); |
d1bacf9e | 839 | cache_page_release(desc); |
1e7cb3dc CL |
840 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
841 | (unsigned long long)*desc->dir_cookie, res); | |
1da177e4 LT |
842 | return res; |
843 | } | |
844 | ||
845 | /* | |
846 | * If we cannot find a cookie in our cache, we suspect that this is | |
847 | * because it points to a deleted file, so we ask the server to return | |
848 | * whatever it thinks is the next entry. We then feed this to filldir. | |
849 | * If all goes well, we should then be able to find our way round the | |
850 | * cache on the next call to readdir_search_pagecache(); | |
851 | * | |
852 | * NOTE: we cannot add the anonymous page to the pagecache because | |
853 | * the data it contains might not be page aligned. Besides, | |
854 | * we should already have a complete representation of the | |
855 | * directory in the page cache by the time we get here. | |
856 | */ | |
857 | static inline | |
23db8620 | 858 | int uncached_readdir(nfs_readdir_descriptor_t *desc) |
1da177e4 | 859 | { |
1da177e4 LT |
860 | struct page *page = NULL; |
861 | int status; | |
496ad9aa | 862 | struct inode *inode = file_inode(desc->file); |
0c030806 | 863 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
1da177e4 | 864 | |
1e7cb3dc CL |
865 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
866 | (unsigned long long)*desc->dir_cookie); | |
1da177e4 LT |
867 | |
868 | page = alloc_page(GFP_HIGHUSER); | |
869 | if (!page) { | |
870 | status = -ENOMEM; | |
871 | goto out; | |
872 | } | |
d1bacf9e | 873 | |
7a8e1dc3 | 874 | desc->page_index = 0; |
0aded708 | 875 | desc->last_cookie = *desc->dir_cookie; |
7a8e1dc3 | 876 | desc->page = page; |
0c030806 | 877 | ctx->duped = 0; |
7a8e1dc3 | 878 | |
85f8607e TM |
879 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
880 | if (status < 0) | |
1da177e4 LT |
881 | goto out_release; |
882 | ||
23db8620 | 883 | status = nfs_do_filldir(desc); |
1da177e4 | 884 | |
1da177e4 | 885 | out: |
1e7cb3dc | 886 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
3110ff80 | 887 | __func__, status); |
1da177e4 LT |
888 | return status; |
889 | out_release: | |
d1bacf9e | 890 | cache_page_release(desc); |
1da177e4 LT |
891 | goto out; |
892 | } | |
893 | ||
00a92642 OG |
894 | /* The file offset position represents the dirent entry number. A |
895 | last cookie cache takes care of the common case of reading the | |
896 | whole directory. | |
1da177e4 | 897 | */ |
23db8620 | 898 | static int nfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 899 | { |
be62a1a8 | 900 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 901 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
902 | nfs_readdir_descriptor_t my_desc, |
903 | *desc = &my_desc; | |
23db8620 | 904 | struct nfs_open_dir_context *dir_ctx = file->private_data; |
07b5ce8e | 905 | int res = 0; |
be4c2d47 | 906 | int max_rapages = NFS_MAX_READDIR_RAPAGES; |
1da177e4 | 907 | |
6de1472f AV |
908 | dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", |
909 | file, (long long)ctx->pos); | |
91d5b470 CL |
910 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
911 | ||
1da177e4 | 912 | /* |
23db8620 | 913 | * ctx->pos points to the dirent entry number. |
f0dd2136 | 914 | * *desc->dir_cookie has the cookie for the next entry. We have |
00a92642 OG |
915 | * to either find the entry with the appropriate number or |
916 | * revalidate the cookie. | |
1da177e4 LT |
917 | */ |
918 | memset(desc, 0, sizeof(*desc)); | |
919 | ||
23db8620 AV |
920 | desc->file = file; |
921 | desc->ctx = ctx; | |
480c2006 | 922 | desc->dir_cookie = &dir_ctx->dir_cookie; |
1da177e4 | 923 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
a7a3b1e9 | 924 | desc->plus = nfs_use_readdirplus(inode, ctx); |
1da177e4 | 925 | |
be4c2d47 | 926 | res = nfs_readdir_alloc_pages(desc->pvec.pages, max_rapages); |
927 | if (res < 0) | |
928 | return -ENOMEM; | |
929 | ||
930 | nfs_readdir_rapages_init(desc); | |
931 | ||
79f687a3 | 932 | if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) |
07b5ce8e | 933 | res = nfs_revalidate_mapping(inode, file->f_mapping); |
fccca7fc TM |
934 | if (res < 0) |
935 | goto out; | |
936 | ||
47c716cb | 937 | do { |
1da177e4 | 938 | res = readdir_search_pagecache(desc); |
00a92642 | 939 | |
1da177e4 | 940 | if (res == -EBADCOOKIE) { |
ece0b423 | 941 | res = 0; |
1da177e4 | 942 | /* This means either end of directory */ |
6089dd0d | 943 | if (*desc->dir_cookie && !desc->eof) { |
1da177e4 | 944 | /* Or that the server has 'lost' a cookie */ |
23db8620 | 945 | res = uncached_readdir(desc); |
ece0b423 | 946 | if (res == 0) |
1da177e4 LT |
947 | continue; |
948 | } | |
1da177e4 LT |
949 | break; |
950 | } | |
951 | if (res == -ETOOSMALL && desc->plus) { | |
3a10c30a | 952 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
1da177e4 | 953 | nfs_zap_caches(inode); |
baf57a09 | 954 | desc->page_index = 0; |
a7a3b1e9 BC |
955 | desc->plus = false; |
956 | desc->eof = false; | |
1da177e4 LT |
957 | continue; |
958 | } | |
959 | if (res < 0) | |
960 | break; | |
961 | ||
23db8620 | 962 | res = nfs_do_filldir(desc); |
ece0b423 | 963 | if (res < 0) |
1da177e4 | 964 | break; |
47c716cb | 965 | } while (!desc->eof); |
fccca7fc | 966 | out: |
be4c2d47 | 967 | nfs_readdir_free_pages(desc->pvec.pages, max_rapages); |
1e7cb3dc CL |
968 | if (res > 0) |
969 | res = 0; | |
6de1472f | 970 | dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); |
1e7cb3dc | 971 | return res; |
1da177e4 LT |
972 | } |
973 | ||
965c8e59 | 974 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) |
f0dd2136 | 975 | { |
b044f645 | 976 | struct inode *inode = file_inode(filp); |
480c2006 | 977 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
b84e06c5 | 978 | |
6de1472f AV |
979 | dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", |
980 | filp, offset, whence); | |
b84e06c5 | 981 | |
965c8e59 | 982 | switch (whence) { |
b2b1ff3d TM |
983 | default: |
984 | return -EINVAL; | |
985 | case SEEK_SET: | |
986 | if (offset < 0) | |
987 | return -EINVAL; | |
988 | inode_lock(inode); | |
989 | break; | |
990 | case SEEK_CUR: | |
991 | if (offset == 0) | |
992 | return filp->f_pos; | |
993 | inode_lock(inode); | |
994 | offset += filp->f_pos; | |
995 | if (offset < 0) { | |
996 | inode_unlock(inode); | |
997 | return -EINVAL; | |
998 | } | |
f0dd2136 TM |
999 | } |
1000 | if (offset != filp->f_pos) { | |
1001 | filp->f_pos = offset; | |
480c2006 | 1002 | dir_ctx->dir_cookie = 0; |
8ef2ce3e | 1003 | dir_ctx->duped = 0; |
f0dd2136 | 1004 | } |
b044f645 | 1005 | inode_unlock(inode); |
f0dd2136 TM |
1006 | return offset; |
1007 | } | |
1008 | ||
1da177e4 LT |
1009 | /* |
1010 | * All directory operations under NFS are synchronous, so fsync() | |
1011 | * is a dummy operation. | |
1012 | */ | |
02c24a82 JB |
1013 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
1014 | int datasync) | |
1da177e4 | 1015 | { |
6de1472f | 1016 | struct inode *inode = file_inode(filp); |
7ea80859 | 1017 | |
6de1472f | 1018 | dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); |
1e7cb3dc | 1019 | |
5955102c | 1020 | inode_lock(inode); |
6de1472f | 1021 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
5955102c | 1022 | inode_unlock(inode); |
1da177e4 LT |
1023 | return 0; |
1024 | } | |
1025 | ||
bfc69a45 TM |
1026 | /** |
1027 | * nfs_force_lookup_revalidate - Mark the directory as having changed | |
302fad7b | 1028 | * @dir: pointer to directory inode |
bfc69a45 TM |
1029 | * |
1030 | * This forces the revalidation code in nfs_lookup_revalidate() to do a | |
1031 | * full lookup on all child dentries of 'dir' whenever a change occurs | |
1032 | * on the server that might have invalidated our dcache. | |
1033 | * | |
1034 | * The caller should be holding dir->i_lock | |
1035 | */ | |
1036 | void nfs_force_lookup_revalidate(struct inode *dir) | |
1037 | { | |
011935a0 | 1038 | NFS_I(dir)->cache_change_attribute++; |
bfc69a45 | 1039 | } |
89d77c8f | 1040 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
bfc69a45 | 1041 | |
1da177e4 LT |
1042 | /* |
1043 | * A check for whether or not the parent directory has changed. | |
1044 | * In the case it has, we assume that the dentries are untrustworthy | |
1045 | * and may need to be looked up again. | |
912a108d | 1046 | * If rcu_walk prevents us from performing a full check, return 0. |
1da177e4 | 1047 | */ |
912a108d N |
1048 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, |
1049 | int rcu_walk) | |
1da177e4 LT |
1050 | { |
1051 | if (IS_ROOT(dentry)) | |
1052 | return 1; | |
4eec952e TM |
1053 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
1054 | return 0; | |
f2c77f4e TM |
1055 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1056 | return 0; | |
1057 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ | |
1cd9cb05 TM |
1058 | if (nfs_mapping_need_revalidate_inode(dir)) { |
1059 | if (rcu_walk) | |
1060 | return 0; | |
1061 | if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) | |
1062 | return 0; | |
1063 | } | |
f2c77f4e TM |
1064 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
1065 | return 0; | |
1066 | return 1; | |
1da177e4 LT |
1067 | } |
1068 | ||
a12802ca TM |
1069 | /* |
1070 | * Use intent information to check whether or not we're going to do | |
1071 | * an O_EXCL create using this path component. | |
1072 | */ | |
fa3c56bb | 1073 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
a12802ca TM |
1074 | { |
1075 | if (NFS_PROTO(dir)->version == 2) | |
1076 | return 0; | |
fa3c56bb | 1077 | return flags & LOOKUP_EXCL; |
a12802ca TM |
1078 | } |
1079 | ||
1d6757fb TM |
1080 | /* |
1081 | * Inode and filehandle revalidation for lookups. | |
1082 | * | |
1083 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, | |
1084 | * or if the intent information indicates that we're about to open this | |
1085 | * particular file and the "nocto" mount flag is not set. | |
1086 | * | |
1087 | */ | |
65a0c149 | 1088 | static |
fa3c56bb | 1089 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
1da177e4 LT |
1090 | { |
1091 | struct nfs_server *server = NFS_SERVER(inode); | |
65a0c149 | 1092 | int ret; |
1da177e4 | 1093 | |
36d43a43 | 1094 | if (IS_AUTOMOUNT(inode)) |
4e99a1ff | 1095 | return 0; |
47921921 TM |
1096 | |
1097 | if (flags & LOOKUP_OPEN) { | |
1098 | switch (inode->i_mode & S_IFMT) { | |
1099 | case S_IFREG: | |
1100 | /* A NFSv4 OPEN will revalidate later */ | |
1101 | if (server->caps & NFS_CAP_ATOMIC_OPEN) | |
1102 | goto out; | |
1103 | /* Fallthrough */ | |
1104 | case S_IFDIR: | |
1105 | if (server->flags & NFS_MOUNT_NOCTO) | |
1106 | break; | |
1107 | /* NFS close-to-open cache consistency validation */ | |
1108 | goto out_force; | |
1109 | } | |
1110 | } | |
1111 | ||
facc3530 | 1112 | /* VFS wants an on-the-wire revalidation */ |
fa3c56bb | 1113 | if (flags & LOOKUP_REVAL) |
facc3530 | 1114 | goto out_force; |
65a0c149 | 1115 | out: |
a61246c9 | 1116 | return (inode->i_nlink == 0) ? -ESTALE : 0; |
1da177e4 | 1117 | out_force: |
1fa1e384 N |
1118 | if (flags & LOOKUP_RCU) |
1119 | return -ECHILD; | |
65a0c149 TM |
1120 | ret = __nfs_revalidate_inode(server, inode); |
1121 | if (ret != 0) | |
1122 | return ret; | |
1123 | goto out; | |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | /* | |
1127 | * We judge how long we want to trust negative | |
1128 | * dentries by looking at the parent inode mtime. | |
1129 | * | |
1130 | * If parent mtime has changed, we revalidate, else we wait for a | |
1131 | * period corresponding to the parent's attribute cache timeout value. | |
912a108d N |
1132 | * |
1133 | * If LOOKUP_RCU prevents us from performing a full check, return 1 | |
1134 | * suggesting a reval is needed. | |
9f6d44d4 TM |
1135 | * |
1136 | * Note that when creating a new file, or looking up a rename target, | |
1137 | * then it shouldn't be necessary to revalidate a negative dentry. | |
1da177e4 LT |
1138 | */ |
1139 | static inline | |
1140 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, | |
fa3c56bb | 1141 | unsigned int flags) |
1da177e4 | 1142 | { |
9f6d44d4 | 1143 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
1da177e4 | 1144 | return 0; |
4eec952e TM |
1145 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
1146 | return 1; | |
912a108d | 1147 | return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); |
1da177e4 LT |
1148 | } |
1149 | ||
5ceb9d7f TM |
1150 | static int |
1151 | nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, | |
1152 | struct inode *inode, int error) | |
1153 | { | |
1154 | switch (error) { | |
1155 | case 1: | |
1156 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", | |
1157 | __func__, dentry); | |
1158 | return 1; | |
1159 | case 0: | |
1160 | nfs_mark_for_revalidate(dir); | |
1161 | if (inode && S_ISDIR(inode->i_mode)) { | |
1162 | /* Purge readdir caches. */ | |
1163 | nfs_zap_caches(inode); | |
1164 | /* | |
1165 | * We can't d_drop the root of a disconnected tree: | |
1166 | * its d_hash is on the s_anon list and d_drop() would hide | |
1167 | * it from shrink_dcache_for_unmount(), leading to busy | |
1168 | * inodes on unmount and further oopses. | |
1169 | */ | |
1170 | if (IS_ROOT(dentry)) | |
1171 | return 1; | |
1172 | } | |
1173 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", | |
1174 | __func__, dentry); | |
1175 | return 0; | |
1176 | } | |
1177 | dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", | |
1178 | __func__, dentry, error); | |
1179 | return error; | |
1180 | } | |
1181 | ||
1182 | static int | |
1183 | nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, | |
1184 | unsigned int flags) | |
1185 | { | |
1186 | int ret = 1; | |
1187 | if (nfs_neg_need_reval(dir, dentry, flags)) { | |
1188 | if (flags & LOOKUP_RCU) | |
1189 | return -ECHILD; | |
1190 | ret = 0; | |
1191 | } | |
1192 | return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); | |
1193 | } | |
1194 | ||
1195 | static int | |
1196 | nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, | |
1197 | struct inode *inode) | |
1198 | { | |
1199 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1200 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1201 | } | |
1202 | ||
1203 | static int | |
1204 | nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, | |
1205 | struct inode *inode) | |
1206 | { | |
1207 | struct nfs_fh *fhandle; | |
1208 | struct nfs_fattr *fattr; | |
1209 | struct nfs4_label *label; | |
1210 | int ret; | |
1211 | ||
1212 | ret = -ENOMEM; | |
1213 | fhandle = nfs_alloc_fhandle(); | |
1214 | fattr = nfs_alloc_fattr(); | |
1215 | label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); | |
1216 | if (fhandle == NULL || fattr == NULL || IS_ERR(label)) | |
1217 | goto out; | |
1218 | ||
1219 | ret = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); | |
1220 | if (ret < 0) { | |
1221 | if (ret == -ESTALE || ret == -ENOENT) | |
1222 | ret = 0; | |
1223 | goto out; | |
1224 | } | |
1225 | ret = 0; | |
1226 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) | |
1227 | goto out; | |
1228 | if (nfs_refresh_inode(inode, fattr) < 0) | |
1229 | goto out; | |
1230 | ||
1231 | nfs_setsecurity(inode, fattr, label); | |
1232 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
1233 | ||
1234 | /* set a readdirplus hint that we had a cache miss */ | |
1235 | nfs_force_use_readdirplus(dir); | |
1236 | ret = 1; | |
1237 | out: | |
1238 | nfs_free_fattr(fattr); | |
1239 | nfs_free_fhandle(fhandle); | |
1240 | nfs4_label_free(label); | |
1241 | return nfs_lookup_revalidate_done(dir, dentry, inode, ret); | |
1242 | } | |
1243 | ||
1da177e4 LT |
1244 | /* |
1245 | * This is called every time the dcache has a lookup hit, | |
1246 | * and we should check whether we can really trust that | |
1247 | * lookup. | |
1248 | * | |
1249 | * NOTE! The hit can be a negative hit too, don't assume | |
1250 | * we have an inode! | |
1251 | * | |
1252 | * If the parent directory is seen to have changed, we throw out the | |
1253 | * cached dentry and do a new lookup. | |
1254 | */ | |
5ceb9d7f TM |
1255 | static int |
1256 | nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
1257 | unsigned int flags) | |
1da177e4 | 1258 | { |
1da177e4 | 1259 | struct inode *inode; |
1da177e4 | 1260 | int error; |
1da177e4 | 1261 | |
91d5b470 | 1262 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
2b0143b5 | 1263 | inode = d_inode(dentry); |
1da177e4 | 1264 | |
5ceb9d7f TM |
1265 | if (!inode) |
1266 | return nfs_lookup_revalidate_negative(dir, dentry, flags); | |
1da177e4 LT |
1267 | |
1268 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1269 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1270 | __func__, dentry); | |
1da177e4 LT |
1271 | goto out_bad; |
1272 | } | |
1273 | ||
011e2a7f | 1274 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
5ceb9d7f | 1275 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); |
15860ab1 | 1276 | |
1da177e4 | 1277 | /* Force a full look up iff the parent directory has changed */ |
73dd684a | 1278 | if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && |
912a108d | 1279 | nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { |
cc89684c N |
1280 | error = nfs_lookup_verify_inode(inode, flags); |
1281 | if (error) { | |
cc89684c | 1282 | if (error == -ESTALE) |
5ceb9d7f TM |
1283 | nfs_zap_caches(dir); |
1284 | goto out_bad; | |
1fa1e384 | 1285 | } |
63519fbc | 1286 | nfs_advise_use_readdirplus(dir); |
1da177e4 LT |
1287 | goto out_valid; |
1288 | } | |
1289 | ||
912a108d N |
1290 | if (flags & LOOKUP_RCU) |
1291 | return -ECHILD; | |
1292 | ||
1da177e4 LT |
1293 | if (NFS_STALE(inode)) |
1294 | goto out_bad; | |
1295 | ||
6e0d0be7 | 1296 | trace_nfs_lookup_revalidate_enter(dir, dentry, flags); |
5ceb9d7f | 1297 | error = nfs_lookup_revalidate_dentry(dir, dentry, inode); |
6e0d0be7 | 1298 | trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); |
5ceb9d7f TM |
1299 | return error; |
1300 | out_valid: | |
1301 | return nfs_lookup_revalidate_done(dir, dentry, inode, 1); | |
1302 | out_bad: | |
1303 | if (flags & LOOKUP_RCU) | |
1304 | return -ECHILD; | |
1305 | return nfs_lookup_revalidate_done(dir, dentry, inode, 0); | |
1306 | } | |
14c43f76 | 1307 | |
5ceb9d7f | 1308 | static int |
c7944ebb TM |
1309 | __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, |
1310 | int (*reval)(struct inode *, struct dentry *, unsigned int)) | |
5ceb9d7f TM |
1311 | { |
1312 | struct dentry *parent; | |
1313 | struct inode *dir; | |
1314 | int ret; | |
63519fbc | 1315 | |
d51ac1a8 | 1316 | if (flags & LOOKUP_RCU) { |
5ceb9d7f TM |
1317 | parent = READ_ONCE(dentry->d_parent); |
1318 | dir = d_inode_rcu(parent); | |
1319 | if (!dir) | |
1320 | return -ECHILD; | |
c7944ebb | 1321 | ret = reval(dir, dentry, flags); |
6aa7de05 | 1322 | if (parent != READ_ONCE(dentry->d_parent)) |
d51ac1a8 | 1323 | return -ECHILD; |
5ceb9d7f TM |
1324 | } else { |
1325 | parent = dget_parent(dentry); | |
c7944ebb | 1326 | ret = reval(d_inode(parent), dentry, flags); |
d51ac1a8 | 1327 | dput(parent); |
1da177e4 | 1328 | } |
5ceb9d7f | 1329 | return ret; |
1da177e4 LT |
1330 | } |
1331 | ||
c7944ebb TM |
1332 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1333 | { | |
1334 | return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); | |
1335 | } | |
1336 | ||
ecf3d1f1 | 1337 | /* |
2b0143b5 | 1338 | * A weaker form of d_revalidate for revalidating just the d_inode(dentry) |
ecf3d1f1 JL |
1339 | * when we don't really care about the dentry name. This is called when a |
1340 | * pathwalk ends on a dentry that was not found via a normal lookup in the | |
1341 | * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). | |
1342 | * | |
1343 | * In this situation, we just want to verify that the inode itself is OK | |
1344 | * since the dentry might have changed on the server. | |
1345 | */ | |
1346 | static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) | |
1347 | { | |
2b0143b5 | 1348 | struct inode *inode = d_inode(dentry); |
9cdd1d3f | 1349 | int error = 0; |
ecf3d1f1 JL |
1350 | |
1351 | /* | |
1352 | * I believe we can only get a negative dentry here in the case of a | |
1353 | * procfs-style symlink. Just assume it's correct for now, but we may | |
1354 | * eventually need to do something more here. | |
1355 | */ | |
1356 | if (!inode) { | |
6de1472f AV |
1357 | dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", |
1358 | __func__, dentry); | |
ecf3d1f1 JL |
1359 | return 1; |
1360 | } | |
1361 | ||
1362 | if (is_bad_inode(inode)) { | |
6de1472f AV |
1363 | dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", |
1364 | __func__, dentry); | |
ecf3d1f1 JL |
1365 | return 0; |
1366 | } | |
1367 | ||
b688741c | 1368 | error = nfs_lookup_verify_inode(inode, flags); |
ecf3d1f1 JL |
1369 | dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", |
1370 | __func__, inode->i_ino, error ? "invalid" : "valid"); | |
1371 | return !error; | |
1372 | } | |
1373 | ||
1da177e4 LT |
1374 | /* |
1375 | * This is called from dput() when d_count is going to 0. | |
1376 | */ | |
fe15ce44 | 1377 | static int nfs_dentry_delete(const struct dentry *dentry) |
1da177e4 | 1378 | { |
6de1472f AV |
1379 | dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", |
1380 | dentry, dentry->d_flags); | |
1da177e4 | 1381 | |
77f11192 | 1382 | /* Unhash any dentry with a stale inode */ |
2b0143b5 | 1383 | if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) |
77f11192 TM |
1384 | return 1; |
1385 | ||
1da177e4 LT |
1386 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
1387 | /* Unhash it, so that ->d_iput() would be called */ | |
1388 | return 1; | |
1389 | } | |
1751e8a6 | 1390 | if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { |
1da177e4 LT |
1391 | /* Unhash it, so that ancestors of killed async unlink |
1392 | * files will be cleaned up during umount */ | |
1393 | return 1; | |
1394 | } | |
1395 | return 0; | |
1396 | ||
1397 | } | |
1398 | ||
1f018458 | 1399 | /* Ensure that we revalidate inode->i_nlink */ |
1b83d707 TM |
1400 | static void nfs_drop_nlink(struct inode *inode) |
1401 | { | |
1402 | spin_lock(&inode->i_lock); | |
1f018458 | 1403 | /* drop the inode if we're reasonably sure this is the last link */ |
59a707b0 TM |
1404 | if (inode->i_nlink > 0) |
1405 | drop_nlink(inode); | |
1406 | NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
16e14375 TM |
1407 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE |
1408 | | NFS_INO_INVALID_CTIME | |
59a707b0 TM |
1409 | | NFS_INO_INVALID_OTHER |
1410 | | NFS_INO_REVAL_FORCED; | |
1b83d707 TM |
1411 | spin_unlock(&inode->i_lock); |
1412 | } | |
1413 | ||
1da177e4 LT |
1414 | /* |
1415 | * Called when the dentry loses inode. | |
1416 | * We use it to clean up silly-renamed files. | |
1417 | */ | |
1418 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) | |
1419 | { | |
83672d39 NB |
1420 | if (S_ISDIR(inode->i_mode)) |
1421 | /* drop any readdir cache as it could easily be old */ | |
1422 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
1423 | ||
1da177e4 | 1424 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
e4eff1a6 | 1425 | nfs_complete_unlink(dentry, inode); |
1f018458 | 1426 | nfs_drop_nlink(inode); |
1da177e4 | 1427 | } |
1da177e4 LT |
1428 | iput(inode); |
1429 | } | |
1430 | ||
b1942c5f AV |
1431 | static void nfs_d_release(struct dentry *dentry) |
1432 | { | |
1433 | /* free cached devname value, if it survived that far */ | |
1434 | if (unlikely(dentry->d_fsdata)) { | |
1435 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1436 | WARN_ON(1); | |
1437 | else | |
1438 | kfree(dentry->d_fsdata); | |
1439 | } | |
1440 | } | |
1441 | ||
f786aa90 | 1442 | const struct dentry_operations nfs_dentry_operations = { |
1da177e4 | 1443 | .d_revalidate = nfs_lookup_revalidate, |
ecf3d1f1 | 1444 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1445 | .d_delete = nfs_dentry_delete, |
1446 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1447 | .d_automount = nfs_d_automount, |
b1942c5f | 1448 | .d_release = nfs_d_release, |
1da177e4 | 1449 | }; |
ddda8e0a | 1450 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
1da177e4 | 1451 | |
597d9289 | 1452 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
1453 | { |
1454 | struct dentry *res; | |
1455 | struct inode *inode = NULL; | |
e1fb4d05 TM |
1456 | struct nfs_fh *fhandle = NULL; |
1457 | struct nfs_fattr *fattr = NULL; | |
1775fd3e | 1458 | struct nfs4_label *label = NULL; |
1da177e4 | 1459 | int error; |
1da177e4 | 1460 | |
6de1472f | 1461 | dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); |
91d5b470 | 1462 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
1da177e4 | 1463 | |
130f9ab7 AV |
1464 | if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) |
1465 | return ERR_PTR(-ENAMETOOLONG); | |
1da177e4 | 1466 | |
fd684071 TM |
1467 | /* |
1468 | * If we're doing an exclusive create, optimize away the lookup | |
1469 | * but don't hash the dentry. | |
1470 | */ | |
9f6d44d4 | 1471 | if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) |
130f9ab7 | 1472 | return NULL; |
1da177e4 | 1473 | |
e1fb4d05 TM |
1474 | res = ERR_PTR(-ENOMEM); |
1475 | fhandle = nfs_alloc_fhandle(); | |
1476 | fattr = nfs_alloc_fattr(); | |
1477 | if (fhandle == NULL || fattr == NULL) | |
1478 | goto out; | |
1479 | ||
14c43f76 DQ |
1480 | label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); |
1481 | if (IS_ERR(label)) | |
1482 | goto out; | |
1483 | ||
6e0d0be7 | 1484 | trace_nfs_lookup_enter(dir, dentry, flags); |
1775fd3e | 1485 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); |
1da177e4 LT |
1486 | if (error == -ENOENT) |
1487 | goto no_entry; | |
1488 | if (error < 0) { | |
1489 | res = ERR_PTR(error); | |
bf130914 | 1490 | goto out_label; |
1da177e4 | 1491 | } |
1775fd3e | 1492 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
bf0c84f1 | 1493 | res = ERR_CAST(inode); |
03f28e3a | 1494 | if (IS_ERR(res)) |
bf130914 | 1495 | goto out_label; |
54ceac45 | 1496 | |
63519fbc TM |
1497 | /* Notify readdir to use READDIRPLUS */ |
1498 | nfs_force_use_readdirplus(dir); | |
d69ee9b8 | 1499 | |
1da177e4 | 1500 | no_entry: |
41d28bca | 1501 | res = d_splice_alias(inode, dentry); |
9eaef27b TM |
1502 | if (res != NULL) { |
1503 | if (IS_ERR(res)) | |
bf130914 | 1504 | goto out_label; |
1da177e4 | 1505 | dentry = res; |
9eaef27b | 1506 | } |
1da177e4 | 1507 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
bf130914 | 1508 | out_label: |
6e0d0be7 | 1509 | trace_nfs_lookup_exit(dir, dentry, flags, error); |
14c43f76 | 1510 | nfs4_label_free(label); |
1da177e4 | 1511 | out: |
e1fb4d05 TM |
1512 | nfs_free_fattr(fattr); |
1513 | nfs_free_fhandle(fhandle); | |
1da177e4 LT |
1514 | return res; |
1515 | } | |
ddda8e0a | 1516 | EXPORT_SYMBOL_GPL(nfs_lookup); |
1da177e4 | 1517 | |
89d77c8f | 1518 | #if IS_ENABLED(CONFIG_NFS_V4) |
0b728e19 | 1519 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
1da177e4 | 1520 | |
f786aa90 | 1521 | const struct dentry_operations nfs4_dentry_operations = { |
0ef97dcf | 1522 | .d_revalidate = nfs4_lookup_revalidate, |
b688741c | 1523 | .d_weak_revalidate = nfs_weak_revalidate, |
1da177e4 LT |
1524 | .d_delete = nfs_dentry_delete, |
1525 | .d_iput = nfs_dentry_iput, | |
36d43a43 | 1526 | .d_automount = nfs_d_automount, |
b1942c5f | 1527 | .d_release = nfs_d_release, |
1da177e4 | 1528 | }; |
89d77c8f | 1529 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
1da177e4 | 1530 | |
8a5e929d AV |
1531 | static fmode_t flags_to_mode(int flags) |
1532 | { | |
1533 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; | |
1534 | if ((flags & O_ACCMODE) != O_WRONLY) | |
1535 | res |= FMODE_READ; | |
1536 | if ((flags & O_ACCMODE) != O_RDONLY) | |
1537 | res |= FMODE_WRITE; | |
1538 | return res; | |
1539 | } | |
1540 | ||
532d4def | 1541 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) |
cd9a1c0e | 1542 | { |
532d4def | 1543 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); |
cd9a1c0e TM |
1544 | } |
1545 | ||
1546 | static int do_open(struct inode *inode, struct file *filp) | |
1547 | { | |
f1fe29b4 | 1548 | nfs_fscache_open_file(inode, filp); |
cd9a1c0e TM |
1549 | return 0; |
1550 | } | |
1551 | ||
d9585277 AV |
1552 | static int nfs_finish_open(struct nfs_open_context *ctx, |
1553 | struct dentry *dentry, | |
b452a458 | 1554 | struct file *file, unsigned open_flags) |
cd9a1c0e | 1555 | { |
0dd2b474 MS |
1556 | int err; |
1557 | ||
be12af3e | 1558 | err = finish_open(file, dentry, do_open); |
30d90494 | 1559 | if (err) |
d9585277 | 1560 | goto out; |
eaa2b82c N |
1561 | if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) |
1562 | nfs_file_set_open_context(file, ctx); | |
1563 | else | |
1564 | err = -ESTALE; | |
cd9a1c0e | 1565 | out: |
d9585277 | 1566 | return err; |
cd9a1c0e TM |
1567 | } |
1568 | ||
73a79706 BS |
1569 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
1570 | struct file *file, unsigned open_flags, | |
44907d79 | 1571 | umode_t mode) |
1da177e4 | 1572 | { |
c94c0953 | 1573 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
cd9a1c0e | 1574 | struct nfs_open_context *ctx; |
0dd2b474 MS |
1575 | struct dentry *res; |
1576 | struct iattr attr = { .ia_valid = ATTR_OPEN }; | |
f46e0bd3 | 1577 | struct inode *inode; |
1472b83e | 1578 | unsigned int lookup_flags = 0; |
c94c0953 | 1579 | bool switched = false; |
73a09dd9 | 1580 | int created = 0; |
898f635c | 1581 | int err; |
1da177e4 | 1582 | |
0dd2b474 | 1583 | /* Expect a negative dentry */ |
2b0143b5 | 1584 | BUG_ON(d_inode(dentry)); |
0dd2b474 | 1585 | |
1e8968c5 | 1586 | dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", |
6de1472f | 1587 | dir->i_sb->s_id, dir->i_ino, dentry); |
1e7cb3dc | 1588 | |
9597c13b JL |
1589 | err = nfs_check_flags(open_flags); |
1590 | if (err) | |
1591 | return err; | |
1592 | ||
0dd2b474 MS |
1593 | /* NFS only supports OPEN on regular files */ |
1594 | if ((open_flags & O_DIRECTORY)) { | |
00699ad8 | 1595 | if (!d_in_lookup(dentry)) { |
0dd2b474 MS |
1596 | /* |
1597 | * Hashed negative dentry with O_DIRECTORY: dentry was | |
1598 | * revalidated and is fine, no need to perform lookup | |
1599 | * again | |
1600 | */ | |
d9585277 | 1601 | return -ENOENT; |
0dd2b474 | 1602 | } |
1472b83e | 1603 | lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; |
1da177e4 | 1604 | goto no_open; |
02a913a7 | 1605 | } |
1da177e4 | 1606 | |
0dd2b474 | 1607 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
d9585277 | 1608 | return -ENAMETOOLONG; |
cd9a1c0e | 1609 | |
0dd2b474 | 1610 | if (open_flags & O_CREAT) { |
dff25ddb AG |
1611 | struct nfs_server *server = NFS_SERVER(dir); |
1612 | ||
1613 | if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) | |
1614 | mode &= ~current_umask(); | |
1615 | ||
536e43d1 | 1616 | attr.ia_valid |= ATTR_MODE; |
dff25ddb | 1617 | attr.ia_mode = mode; |
0dd2b474 | 1618 | } |
536e43d1 TM |
1619 | if (open_flags & O_TRUNC) { |
1620 | attr.ia_valid |= ATTR_SIZE; | |
1621 | attr.ia_size = 0; | |
cd9a1c0e TM |
1622 | } |
1623 | ||
c94c0953 AV |
1624 | if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { |
1625 | d_drop(dentry); | |
1626 | switched = true; | |
1627 | dentry = d_alloc_parallel(dentry->d_parent, | |
1628 | &dentry->d_name, &wq); | |
1629 | if (IS_ERR(dentry)) | |
1630 | return PTR_ERR(dentry); | |
1631 | if (unlikely(!d_in_lookup(dentry))) | |
1632 | return finish_no_open(file, dentry); | |
1633 | } | |
1634 | ||
532d4def | 1635 | ctx = create_nfs_open_context(dentry, open_flags, file); |
0dd2b474 MS |
1636 | err = PTR_ERR(ctx); |
1637 | if (IS_ERR(ctx)) | |
d9585277 | 1638 | goto out; |
0dd2b474 | 1639 | |
6e0d0be7 | 1640 | trace_nfs_atomic_open_enter(dir, ctx, open_flags); |
73a09dd9 AV |
1641 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); |
1642 | if (created) | |
1643 | file->f_mode |= FMODE_CREATED; | |
f46e0bd3 | 1644 | if (IS_ERR(inode)) { |
0dd2b474 | 1645 | err = PTR_ERR(inode); |
6e0d0be7 | 1646 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1647 | put_nfs_open_context(ctx); |
d20cb71d | 1648 | d_drop(dentry); |
0dd2b474 MS |
1649 | switch (err) { |
1650 | case -ENOENT: | |
774d9513 | 1651 | d_splice_alias(NULL, dentry); |
809fd143 | 1652 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
0dd2b474 MS |
1653 | break; |
1654 | case -EISDIR: | |
1655 | case -ENOTDIR: | |
1656 | goto no_open; | |
1657 | case -ELOOP: | |
1658 | if (!(open_flags & O_NOFOLLOW)) | |
6f926b5b | 1659 | goto no_open; |
0dd2b474 | 1660 | break; |
1da177e4 | 1661 | /* case -EINVAL: */ |
0dd2b474 MS |
1662 | default: |
1663 | break; | |
1da177e4 | 1664 | } |
d9585277 | 1665 | goto out; |
cd9a1c0e | 1666 | } |
0dd2b474 | 1667 | |
b452a458 | 1668 | err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); |
6e0d0be7 | 1669 | trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); |
2d9db750 | 1670 | put_nfs_open_context(ctx); |
d9585277 | 1671 | out: |
c94c0953 AV |
1672 | if (unlikely(switched)) { |
1673 | d_lookup_done(dentry); | |
1674 | dput(dentry); | |
1675 | } | |
d9585277 | 1676 | return err; |
0dd2b474 | 1677 | |
1da177e4 | 1678 | no_open: |
1472b83e | 1679 | res = nfs_lookup(dir, dentry, lookup_flags); |
c94c0953 AV |
1680 | if (switched) { |
1681 | d_lookup_done(dentry); | |
1682 | if (!res) | |
1683 | res = dentry; | |
1684 | else | |
1685 | dput(dentry); | |
1686 | } | |
0dd2b474 | 1687 | if (IS_ERR(res)) |
c94c0953 | 1688 | return PTR_ERR(res); |
e45198a6 | 1689 | return finish_no_open(file, res); |
1da177e4 | 1690 | } |
89d77c8f | 1691 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
1da177e4 | 1692 | |
c7944ebb TM |
1693 | static int |
1694 | nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, | |
1695 | unsigned int flags) | |
1da177e4 | 1696 | { |
657e94b6 | 1697 | struct inode *inode; |
1da177e4 | 1698 | |
fa3c56bb | 1699 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
c7944ebb | 1700 | goto full_reval; |
eda72afb | 1701 | if (d_mountpoint(dentry)) |
c7944ebb | 1702 | goto full_reval; |
2b484297 | 1703 | |
2b0143b5 | 1704 | inode = d_inode(dentry); |
2b484297 | 1705 | |
1da177e4 LT |
1706 | /* We can't create new files in nfs_open_revalidate(), so we |
1707 | * optimize away revalidation of negative dentries. | |
1708 | */ | |
c7944ebb TM |
1709 | if (inode == NULL) |
1710 | goto full_reval; | |
1711 | ||
1712 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) | |
1713 | return nfs_lookup_revalidate_delegated(dir, dentry, inode); | |
216d5d06 | 1714 | |
1da177e4 LT |
1715 | /* NFS only supports OPEN on regular files */ |
1716 | if (!S_ISREG(inode->i_mode)) | |
c7944ebb TM |
1717 | goto full_reval; |
1718 | ||
1da177e4 | 1719 | /* We cannot do exclusive creation on a positive dentry */ |
c7944ebb TM |
1720 | if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) |
1721 | goto reval_dentry; | |
1722 | ||
1723 | /* Check if the directory changed */ | |
1724 | if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) | |
1725 | goto reval_dentry; | |
1da177e4 | 1726 | |
0ef97dcf | 1727 | /* Let f_op->open() actually open (and revalidate) the file */ |
c7944ebb TM |
1728 | return 1; |
1729 | reval_dentry: | |
1730 | if (flags & LOOKUP_RCU) | |
1731 | return -ECHILD; | |
42f72cf3 | 1732 | return nfs_lookup_revalidate_dentry(dir, dentry, inode); |
536e43d1 | 1733 | |
c7944ebb TM |
1734 | full_reval: |
1735 | return nfs_do_lookup_revalidate(dir, dentry, flags); | |
1736 | } | |
535918f1 | 1737 | |
c7944ebb TM |
1738 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
1739 | { | |
1740 | return __nfs_lookup_revalidate(dentry, flags, | |
1741 | nfs4_do_lookup_revalidate); | |
c0204fd2 TM |
1742 | } |
1743 | ||
1da177e4 LT |
1744 | #endif /* CONFIG_NFSV4 */ |
1745 | ||
1da177e4 LT |
1746 | /* |
1747 | * Code common to create, mkdir, and mknod. | |
1748 | */ | |
1749 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, | |
1775fd3e DQ |
1750 | struct nfs_fattr *fattr, |
1751 | struct nfs4_label *label) | |
1da177e4 | 1752 | { |
fab728e1 | 1753 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 1754 | struct inode *dir = d_inode(parent); |
1da177e4 | 1755 | struct inode *inode; |
b0c6108e | 1756 | struct dentry *d; |
1da177e4 LT |
1757 | int error = -EACCES; |
1758 | ||
fab728e1 TM |
1759 | d_drop(dentry); |
1760 | ||
1da177e4 | 1761 | /* We may have been initialized further down */ |
2b0143b5 | 1762 | if (d_really_is_positive(dentry)) |
fab728e1 | 1763 | goto out; |
1da177e4 | 1764 | if (fhandle->size == 0) { |
1775fd3e | 1765 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); |
1da177e4 | 1766 | if (error) |
fab728e1 | 1767 | goto out_error; |
1da177e4 | 1768 | } |
5724ab37 | 1769 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1da177e4 LT |
1770 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
1771 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
a841b54d TM |
1772 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, |
1773 | fattr, NULL, NULL); | |
1da177e4 | 1774 | if (error < 0) |
fab728e1 | 1775 | goto out_error; |
1da177e4 | 1776 | } |
1775fd3e | 1777 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); |
b0c6108e AV |
1778 | d = d_splice_alias(inode, dentry); |
1779 | if (IS_ERR(d)) { | |
1780 | error = PTR_ERR(d); | |
fab728e1 | 1781 | goto out_error; |
b0c6108e AV |
1782 | } |
1783 | dput(d); | |
fab728e1 TM |
1784 | out: |
1785 | dput(parent); | |
1da177e4 | 1786 | return 0; |
fab728e1 TM |
1787 | out_error: |
1788 | nfs_mark_for_revalidate(dir); | |
1789 | dput(parent); | |
1790 | return error; | |
1da177e4 | 1791 | } |
ddda8e0a | 1792 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
1da177e4 LT |
1793 | |
1794 | /* | |
1795 | * Following a failed create operation, we drop the dentry rather | |
1796 | * than retain a negative dentry. This avoids a problem in the event | |
1797 | * that the operation succeeded on the server, but an error in the | |
1798 | * reply path made it appear to have failed. | |
1799 | */ | |
597d9289 | 1800 | int nfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 1801 | umode_t mode, bool excl) |
1da177e4 LT |
1802 | { |
1803 | struct iattr attr; | |
ebfc3b49 | 1804 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
1da177e4 | 1805 | int error; |
1da177e4 | 1806 | |
1e8968c5 | 1807 | dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", |
6de1472f | 1808 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1809 | |
1810 | attr.ia_mode = mode; | |
1811 | attr.ia_valid = ATTR_MODE; | |
1812 | ||
8b0ad3d4 | 1813 | trace_nfs_create_enter(dir, dentry, open_flags); |
8867fe58 | 1814 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
8b0ad3d4 | 1815 | trace_nfs_create_exit(dir, dentry, open_flags, error); |
1da177e4 LT |
1816 | if (error != 0) |
1817 | goto out_err; | |
1da177e4 LT |
1818 | return 0; |
1819 | out_err: | |
1da177e4 LT |
1820 | d_drop(dentry); |
1821 | return error; | |
1822 | } | |
ddda8e0a | 1823 | EXPORT_SYMBOL_GPL(nfs_create); |
1da177e4 LT |
1824 | |
1825 | /* | |
1826 | * See comments for nfs_proc_create regarding failed operations. | |
1827 | */ | |
597d9289 | 1828 | int |
1a67aafb | 1829 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
1830 | { |
1831 | struct iattr attr; | |
1832 | int status; | |
1833 | ||
1e8968c5 | 1834 | dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", |
6de1472f | 1835 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1836 | |
1da177e4 LT |
1837 | attr.ia_mode = mode; |
1838 | attr.ia_valid = ATTR_MODE; | |
1839 | ||
1ca42382 | 1840 | trace_nfs_mknod_enter(dir, dentry); |
1da177e4 | 1841 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
1ca42382 | 1842 | trace_nfs_mknod_exit(dir, dentry, status); |
1da177e4 LT |
1843 | if (status != 0) |
1844 | goto out_err; | |
1da177e4 LT |
1845 | return 0; |
1846 | out_err: | |
1da177e4 LT |
1847 | d_drop(dentry); |
1848 | return status; | |
1849 | } | |
ddda8e0a | 1850 | EXPORT_SYMBOL_GPL(nfs_mknod); |
1da177e4 LT |
1851 | |
1852 | /* | |
1853 | * See comments for nfs_proc_create regarding failed operations. | |
1854 | */ | |
597d9289 | 1855 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
1856 | { |
1857 | struct iattr attr; | |
1858 | int error; | |
1859 | ||
1e8968c5 | 1860 | dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", |
6de1472f | 1861 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 LT |
1862 | |
1863 | attr.ia_valid = ATTR_MODE; | |
1864 | attr.ia_mode = mode | S_IFDIR; | |
1865 | ||
1ca42382 | 1866 | trace_nfs_mkdir_enter(dir, dentry); |
1da177e4 | 1867 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
1ca42382 | 1868 | trace_nfs_mkdir_exit(dir, dentry, error); |
1da177e4 LT |
1869 | if (error != 0) |
1870 | goto out_err; | |
1da177e4 LT |
1871 | return 0; |
1872 | out_err: | |
1873 | d_drop(dentry); | |
1da177e4 LT |
1874 | return error; |
1875 | } | |
ddda8e0a | 1876 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
1da177e4 | 1877 | |
d45b9d8b TM |
1878 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
1879 | { | |
dc3f4198 | 1880 | if (simple_positive(dentry)) |
d45b9d8b TM |
1881 | d_delete(dentry); |
1882 | } | |
1883 | ||
597d9289 | 1884 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1885 | { |
1886 | int error; | |
1887 | ||
1e8968c5 | 1888 | dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", |
6de1472f | 1889 | dir->i_sb->s_id, dir->i_ino, dentry); |
1da177e4 | 1890 | |
1ca42382 | 1891 | trace_nfs_rmdir_enter(dir, dentry); |
2b0143b5 | 1892 | if (d_really_is_positive(dentry)) { |
884be175 | 1893 | down_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1894 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
1895 | /* Ensure the VFS deletes this inode */ | |
1896 | switch (error) { | |
1897 | case 0: | |
2b0143b5 | 1898 | clear_nlink(d_inode(dentry)); |
ba6c0592 TM |
1899 | break; |
1900 | case -ENOENT: | |
1901 | nfs_dentry_handle_enoent(dentry); | |
1902 | } | |
884be175 | 1903 | up_write(&NFS_I(d_inode(dentry))->rmdir_sem); |
ba6c0592 TM |
1904 | } else |
1905 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); | |
1ca42382 | 1906 | trace_nfs_rmdir_exit(dir, dentry, error); |
1da177e4 LT |
1907 | |
1908 | return error; | |
1909 | } | |
ddda8e0a | 1910 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
1da177e4 | 1911 | |
1da177e4 LT |
1912 | /* |
1913 | * Remove a file after making sure there are no pending writes, | |
1914 | * and after checking that the file has only one user. | |
1915 | * | |
1916 | * We invalidate the attribute cache and free the inode prior to the operation | |
1917 | * to avoid possible races if the server reuses the inode. | |
1918 | */ | |
1919 | static int nfs_safe_remove(struct dentry *dentry) | |
1920 | { | |
2b0143b5 DH |
1921 | struct inode *dir = d_inode(dentry->d_parent); |
1922 | struct inode *inode = d_inode(dentry); | |
1da177e4 LT |
1923 | int error = -EBUSY; |
1924 | ||
6de1472f | 1925 | dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); |
1da177e4 LT |
1926 | |
1927 | /* If the dentry was sillyrenamed, we simply call d_delete() */ | |
1928 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
1929 | error = 0; | |
1930 | goto out; | |
1931 | } | |
1932 | ||
1ca42382 | 1933 | trace_nfs_remove_enter(dir, dentry); |
1da177e4 | 1934 | if (inode != NULL) { |
912678db | 1935 | error = NFS_PROTO(dir)->remove(dir, dentry); |
1da177e4 | 1936 | if (error == 0) |
1b83d707 | 1937 | nfs_drop_nlink(inode); |
1da177e4 | 1938 | } else |
912678db | 1939 | error = NFS_PROTO(dir)->remove(dir, dentry); |
d45b9d8b TM |
1940 | if (error == -ENOENT) |
1941 | nfs_dentry_handle_enoent(dentry); | |
1ca42382 | 1942 | trace_nfs_remove_exit(dir, dentry, error); |
1da177e4 LT |
1943 | out: |
1944 | return error; | |
1945 | } | |
1946 | ||
1947 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode | |
1948 | * belongs to an active ".nfs..." file and we return -EBUSY. | |
1949 | * | |
1950 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. | |
1951 | */ | |
597d9289 | 1952 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1953 | { |
1954 | int error; | |
1955 | int need_rehash = 0; | |
1956 | ||
1e8968c5 | 1957 | dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, |
6de1472f | 1958 | dir->i_ino, dentry); |
1da177e4 | 1959 | |
1ca42382 | 1960 | trace_nfs_unlink_enter(dir, dentry); |
1da177e4 | 1961 | spin_lock(&dentry->d_lock); |
84d08fa8 | 1962 | if (d_count(dentry) > 1) { |
1da177e4 | 1963 | spin_unlock(&dentry->d_lock); |
ccfeb506 | 1964 | /* Start asynchronous writeout of the inode */ |
2b0143b5 | 1965 | write_inode_now(d_inode(dentry), 0); |
1da177e4 | 1966 | error = nfs_sillyrename(dir, dentry); |
1ca42382 | 1967 | goto out; |
1da177e4 LT |
1968 | } |
1969 | if (!d_unhashed(dentry)) { | |
1970 | __d_drop(dentry); | |
1971 | need_rehash = 1; | |
1972 | } | |
1973 | spin_unlock(&dentry->d_lock); | |
1da177e4 | 1974 | error = nfs_safe_remove(dentry); |
d45b9d8b | 1975 | if (!error || error == -ENOENT) { |
1da177e4 LT |
1976 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
1977 | } else if (need_rehash) | |
1978 | d_rehash(dentry); | |
1ca42382 TM |
1979 | out: |
1980 | trace_nfs_unlink_exit(dir, dentry, error); | |
1da177e4 LT |
1981 | return error; |
1982 | } | |
ddda8e0a | 1983 | EXPORT_SYMBOL_GPL(nfs_unlink); |
1da177e4 | 1984 | |
873101b3 CL |
1985 | /* |
1986 | * To create a symbolic link, most file systems instantiate a new inode, | |
1987 | * add a page to it containing the path, then write it out to the disk | |
1988 | * using prepare_write/commit_write. | |
1989 | * | |
1990 | * Unfortunately the NFS client can't create the in-core inode first | |
1991 | * because it needs a file handle to create an in-core inode (see | |
1992 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the | |
1993 | * symlink request has completed on the server. | |
1994 | * | |
1995 | * So instead we allocate a raw page, copy the symname into it, then do | |
1996 | * the SYMLINK request with the page as the buffer. If it succeeds, we | |
1997 | * now have a new file handle and can instantiate an in-core NFS inode | |
1998 | * and move the raw page into its mapping. | |
1999 | */ | |
597d9289 | 2000 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
1da177e4 | 2001 | { |
873101b3 CL |
2002 | struct page *page; |
2003 | char *kaddr; | |
1da177e4 | 2004 | struct iattr attr; |
873101b3 | 2005 | unsigned int pathlen = strlen(symname); |
1da177e4 LT |
2006 | int error; |
2007 | ||
1e8968c5 | 2008 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, |
6de1472f | 2009 | dir->i_ino, dentry, symname); |
1da177e4 | 2010 | |
873101b3 CL |
2011 | if (pathlen > PAGE_SIZE) |
2012 | return -ENAMETOOLONG; | |
1da177e4 | 2013 | |
873101b3 CL |
2014 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
2015 | attr.ia_valid = ATTR_MODE; | |
1da177e4 | 2016 | |
e8ecde25 | 2017 | page = alloc_page(GFP_USER); |
76566991 | 2018 | if (!page) |
873101b3 | 2019 | return -ENOMEM; |
873101b3 | 2020 | |
e8ecde25 | 2021 | kaddr = page_address(page); |
873101b3 CL |
2022 | memcpy(kaddr, symname, pathlen); |
2023 | if (pathlen < PAGE_SIZE) | |
2024 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); | |
873101b3 | 2025 | |
1ca42382 | 2026 | trace_nfs_symlink_enter(dir, dentry); |
94a6d753 | 2027 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
1ca42382 | 2028 | trace_nfs_symlink_exit(dir, dentry, error); |
873101b3 | 2029 | if (error != 0) { |
1e8968c5 | 2030 | dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", |
873101b3 | 2031 | dir->i_sb->s_id, dir->i_ino, |
6de1472f | 2032 | dentry, symname, error); |
1da177e4 | 2033 | d_drop(dentry); |
873101b3 | 2034 | __free_page(page); |
873101b3 CL |
2035 | return error; |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * No big deal if we can't add this page to the page cache here. | |
2040 | * READLINK will get the missing page from the server if needed. | |
2041 | */ | |
2b0143b5 | 2042 | if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, |
873101b3 | 2043 | GFP_KERNEL)) { |
873101b3 CL |
2044 | SetPageUptodate(page); |
2045 | unlock_page(page); | |
a0b54add RA |
2046 | /* |
2047 | * add_to_page_cache_lru() grabs an extra page refcount. | |
2048 | * Drop it here to avoid leaking this page later. | |
2049 | */ | |
09cbfeaf | 2050 | put_page(page); |
873101b3 CL |
2051 | } else |
2052 | __free_page(page); | |
2053 | ||
873101b3 | 2054 | return 0; |
1da177e4 | 2055 | } |
ddda8e0a | 2056 | EXPORT_SYMBOL_GPL(nfs_symlink); |
1da177e4 | 2057 | |
597d9289 | 2058 | int |
1da177e4 LT |
2059 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
2060 | { | |
2b0143b5 | 2061 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
2062 | int error; |
2063 | ||
6de1472f AV |
2064 | dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", |
2065 | old_dentry, dentry); | |
1da177e4 | 2066 | |
1fd1085b | 2067 | trace_nfs_link_enter(inode, dir, dentry); |
9697d234 | 2068 | d_drop(dentry); |
1da177e4 | 2069 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
cf809556 | 2070 | if (error == 0) { |
7de9c6ee | 2071 | ihold(inode); |
9697d234 | 2072 | d_add(dentry, inode); |
cf809556 | 2073 | } |
1fd1085b | 2074 | trace_nfs_link_exit(inode, dir, dentry, error); |
1da177e4 LT |
2075 | return error; |
2076 | } | |
ddda8e0a | 2077 | EXPORT_SYMBOL_GPL(nfs_link); |
1da177e4 LT |
2078 | |
2079 | /* | |
2080 | * RENAME | |
2081 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a | |
2082 | * different file handle for the same inode after a rename (e.g. when | |
2083 | * moving to a different directory). A fail-safe method to do so would | |
2084 | * be to look up old_dir/old_name, create a link to new_dir/new_name and | |
2085 | * rename the old file using the sillyrename stuff. This way, the original | |
2086 | * file in old_dir will go away when the last process iput()s the inode. | |
2087 | * | |
2088 | * FIXED. | |
2089 | * | |
2090 | * It actually works quite well. One needs to have the possibility for | |
2091 | * at least one ".nfs..." file in each directory the file ever gets | |
2092 | * moved or linked to which happens automagically with the new | |
2093 | * implementation that only depends on the dcache stuff instead of | |
2094 | * using the inode layer | |
2095 | * | |
2096 | * Unfortunately, things are a little more complicated than indicated | |
2097 | * above. For a cross-directory move, we want to make sure we can get | |
2098 | * rid of the old inode after the operation. This means there must be | |
2099 | * no pending writes (if it's a file), and the use count must be 1. | |
2100 | * If these conditions are met, we can drop the dentries before doing | |
2101 | * the rename. | |
2102 | */ | |
597d9289 | 2103 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1cd66c93 MS |
2104 | struct inode *new_dir, struct dentry *new_dentry, |
2105 | unsigned int flags) | |
1da177e4 | 2106 | { |
2b0143b5 DH |
2107 | struct inode *old_inode = d_inode(old_dentry); |
2108 | struct inode *new_inode = d_inode(new_dentry); | |
d9f29500 | 2109 | struct dentry *dentry = NULL, *rehash = NULL; |
80a491fd | 2110 | struct rpc_task *task; |
1da177e4 LT |
2111 | int error = -EBUSY; |
2112 | ||
1cd66c93 MS |
2113 | if (flags) |
2114 | return -EINVAL; | |
2115 | ||
6de1472f AV |
2116 | dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", |
2117 | old_dentry, new_dentry, | |
84d08fa8 | 2118 | d_count(new_dentry)); |
1da177e4 | 2119 | |
70ded201 | 2120 | trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4 | 2121 | /* |
28f79a1a MS |
2122 | * For non-directories, check whether the target is busy and if so, |
2123 | * make a copy of the dentry and then do a silly-rename. If the | |
2124 | * silly-rename succeeds, the copied dentry is hashed and becomes | |
2125 | * the new target. | |
1da177e4 | 2126 | */ |
27226104 MS |
2127 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
2128 | /* | |
2129 | * To prevent any new references to the target during the | |
2130 | * rename, we unhash the dentry in advance. | |
2131 | */ | |
d9f29500 | 2132 | if (!d_unhashed(new_dentry)) { |
27226104 | 2133 | d_drop(new_dentry); |
d9f29500 BC |
2134 | rehash = new_dentry; |
2135 | } | |
1da177e4 | 2136 | |
84d08fa8 | 2137 | if (d_count(new_dentry) > 2) { |
27226104 MS |
2138 | int err; |
2139 | ||
2140 | /* copy the target dentry's name */ | |
2141 | dentry = d_alloc(new_dentry->d_parent, | |
2142 | &new_dentry->d_name); | |
2143 | if (!dentry) | |
2144 | goto out; | |
2145 | ||
2146 | /* silly-rename the existing target ... */ | |
2147 | err = nfs_sillyrename(new_dir, new_dentry); | |
24e93025 | 2148 | if (err) |
27226104 | 2149 | goto out; |
24e93025 MS |
2150 | |
2151 | new_dentry = dentry; | |
d9f29500 | 2152 | rehash = NULL; |
24e93025 | 2153 | new_inode = NULL; |
27226104 | 2154 | } |
b1e4adf4 | 2155 | } |
1da177e4 | 2156 | |
d9f29500 | 2157 | task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); |
80a491fd JL |
2158 | if (IS_ERR(task)) { |
2159 | error = PTR_ERR(task); | |
2160 | goto out; | |
2161 | } | |
2162 | ||
2163 | error = rpc_wait_for_completion_task(task); | |
818a8dbe BC |
2164 | if (error != 0) { |
2165 | ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; | |
2166 | /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ | |
2167 | smp_wmb(); | |
2168 | } else | |
80a491fd JL |
2169 | error = task->tk_status; |
2170 | rpc_put_task(task); | |
59a707b0 TM |
2171 | /* Ensure the inode attributes are revalidated */ |
2172 | if (error == 0) { | |
2173 | spin_lock(&old_inode->i_lock); | |
2174 | NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
2175 | NFS_I(old_inode)->cache_validity |= NFS_INO_INVALID_CHANGE | |
2176 | | NFS_INO_INVALID_CTIME | |
2177 | | NFS_INO_REVAL_FORCED; | |
2178 | spin_unlock(&old_inode->i_lock); | |
2179 | } | |
1da177e4 | 2180 | out: |
d9f29500 BC |
2181 | if (rehash) |
2182 | d_rehash(rehash); | |
70ded201 TM |
2183 | trace_nfs_rename_exit(old_dir, old_dentry, |
2184 | new_dir, new_dentry, error); | |
d9f29500 BC |
2185 | if (!error) { |
2186 | if (new_inode != NULL) | |
2187 | nfs_drop_nlink(new_inode); | |
2188 | /* | |
2189 | * The d_move() should be here instead of in an async RPC completion | |
2190 | * handler because we need the proper locks to move the dentry. If | |
2191 | * we're interrupted by a signal, the async RPC completion handler | |
2192 | * should mark the directories for revalidation. | |
2193 | */ | |
2194 | d_move(old_dentry, new_dentry); | |
d803224c | 2195 | nfs_set_verifier(old_dentry, |
d9f29500 BC |
2196 | nfs_save_change_attribute(new_dir)); |
2197 | } else if (error == -ENOENT) | |
2198 | nfs_dentry_handle_enoent(old_dentry); | |
2199 | ||
1da177e4 LT |
2200 | /* new dentry created? */ |
2201 | if (dentry) | |
2202 | dput(dentry); | |
1da177e4 LT |
2203 | return error; |
2204 | } | |
ddda8e0a | 2205 | EXPORT_SYMBOL_GPL(nfs_rename); |
1da177e4 | 2206 | |
cfcea3e8 TM |
2207 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
2208 | static LIST_HEAD(nfs_access_lru_list); | |
2209 | static atomic_long_t nfs_access_nr_entries; | |
2210 | ||
3a505845 TM |
2211 | static unsigned long nfs_access_max_cachesize = ULONG_MAX; |
2212 | module_param(nfs_access_max_cachesize, ulong, 0644); | |
2213 | MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); | |
2214 | ||
1c3c07e9 TM |
2215 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
2216 | { | |
b68572e0 | 2217 | put_cred(entry->cred); |
f682a398 | 2218 | kfree_rcu(entry, rcu_head); |
4e857c58 | 2219 | smp_mb__before_atomic(); |
cfcea3e8 | 2220 | atomic_long_dec(&nfs_access_nr_entries); |
4e857c58 | 2221 | smp_mb__after_atomic(); |
1c3c07e9 TM |
2222 | } |
2223 | ||
1a81bb8a TM |
2224 | static void nfs_access_free_list(struct list_head *head) |
2225 | { | |
2226 | struct nfs_access_entry *cache; | |
2227 | ||
2228 | while (!list_empty(head)) { | |
2229 | cache = list_entry(head->next, struct nfs_access_entry, lru); | |
2230 | list_del(&cache->lru); | |
2231 | nfs_access_free_entry(cache); | |
2232 | } | |
2233 | } | |
2234 | ||
3a505845 TM |
2235 | static unsigned long |
2236 | nfs_do_access_cache_scan(unsigned int nr_to_scan) | |
979df72e TM |
2237 | { |
2238 | LIST_HEAD(head); | |
aa510da5 | 2239 | struct nfs_inode *nfsi, *next; |
979df72e | 2240 | struct nfs_access_entry *cache; |
1ab6c499 | 2241 | long freed = 0; |
979df72e | 2242 | |
a50f7951 | 2243 | spin_lock(&nfs_access_lru_lock); |
aa510da5 | 2244 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
979df72e TM |
2245 | struct inode *inode; |
2246 | ||
2247 | if (nr_to_scan-- == 0) | |
2248 | break; | |
9c7e7e23 | 2249 | inode = &nfsi->vfs_inode; |
979df72e TM |
2250 | spin_lock(&inode->i_lock); |
2251 | if (list_empty(&nfsi->access_cache_entry_lru)) | |
2252 | goto remove_lru_entry; | |
2253 | cache = list_entry(nfsi->access_cache_entry_lru.next, | |
2254 | struct nfs_access_entry, lru); | |
2255 | list_move(&cache->lru, &head); | |
2256 | rb_erase(&cache->rb_node, &nfsi->access_cache); | |
1ab6c499 | 2257 | freed++; |
979df72e TM |
2258 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
2259 | list_move_tail(&nfsi->access_cache_inode_lru, | |
2260 | &nfs_access_lru_list); | |
2261 | else { | |
2262 | remove_lru_entry: | |
2263 | list_del_init(&nfsi->access_cache_inode_lru); | |
4e857c58 | 2264 | smp_mb__before_atomic(); |
979df72e | 2265 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
4e857c58 | 2266 | smp_mb__after_atomic(); |
979df72e | 2267 | } |
59844a9b | 2268 | spin_unlock(&inode->i_lock); |
979df72e TM |
2269 | } |
2270 | spin_unlock(&nfs_access_lru_lock); | |
1a81bb8a | 2271 | nfs_access_free_list(&head); |
1ab6c499 DC |
2272 | return freed; |
2273 | } | |
2274 | ||
3a505845 TM |
2275 | unsigned long |
2276 | nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) | |
2277 | { | |
2278 | int nr_to_scan = sc->nr_to_scan; | |
2279 | gfp_t gfp_mask = sc->gfp_mask; | |
2280 | ||
2281 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) | |
2282 | return SHRINK_STOP; | |
2283 | return nfs_do_access_cache_scan(nr_to_scan); | |
2284 | } | |
2285 | ||
2286 | ||
1ab6c499 DC |
2287 | unsigned long |
2288 | nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) | |
2289 | { | |
55f841ce | 2290 | return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); |
979df72e TM |
2291 | } |
2292 | ||
3a505845 TM |
2293 | static void |
2294 | nfs_access_cache_enforce_limit(void) | |
2295 | { | |
2296 | long nr_entries = atomic_long_read(&nfs_access_nr_entries); | |
2297 | unsigned long diff; | |
2298 | unsigned int nr_to_scan; | |
2299 | ||
2300 | if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) | |
2301 | return; | |
2302 | nr_to_scan = 100; | |
2303 | diff = nr_entries - nfs_access_max_cachesize; | |
2304 | if (diff < nr_to_scan) | |
2305 | nr_to_scan = diff; | |
2306 | nfs_do_access_cache_scan(nr_to_scan); | |
2307 | } | |
2308 | ||
1a81bb8a | 2309 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
1da177e4 | 2310 | { |
1c3c07e9 | 2311 | struct rb_root *root_node = &nfsi->access_cache; |
1a81bb8a | 2312 | struct rb_node *n; |
1c3c07e9 TM |
2313 | struct nfs_access_entry *entry; |
2314 | ||
2315 | /* Unhook entries from the cache */ | |
2316 | while ((n = rb_first(root_node)) != NULL) { | |
2317 | entry = rb_entry(n, struct nfs_access_entry, rb_node); | |
2318 | rb_erase(n, root_node); | |
1a81bb8a | 2319 | list_move(&entry->lru, head); |
1c3c07e9 TM |
2320 | } |
2321 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; | |
1da177e4 LT |
2322 | } |
2323 | ||
1c3c07e9 | 2324 | void nfs_access_zap_cache(struct inode *inode) |
1da177e4 | 2325 | { |
1a81bb8a TM |
2326 | LIST_HEAD(head); |
2327 | ||
2328 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) | |
2329 | return; | |
cfcea3e8 | 2330 | /* Remove from global LRU init */ |
1a81bb8a TM |
2331 | spin_lock(&nfs_access_lru_lock); |
2332 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) | |
cfcea3e8 | 2333 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
cfcea3e8 | 2334 | |
1c3c07e9 | 2335 | spin_lock(&inode->i_lock); |
1a81bb8a TM |
2336 | __nfs_access_zap_cache(NFS_I(inode), &head); |
2337 | spin_unlock(&inode->i_lock); | |
2338 | spin_unlock(&nfs_access_lru_lock); | |
2339 | nfs_access_free_list(&head); | |
1c3c07e9 | 2340 | } |
1c606fb7 | 2341 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
1da177e4 | 2342 | |
b68572e0 | 2343 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) |
1c3c07e9 TM |
2344 | { |
2345 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; | |
1c3c07e9 TM |
2346 | |
2347 | while (n != NULL) { | |
b68572e0 N |
2348 | struct nfs_access_entry *entry = |
2349 | rb_entry(n, struct nfs_access_entry, rb_node); | |
2350 | int cmp = cred_fscmp(cred, entry->cred); | |
1c3c07e9 | 2351 | |
b68572e0 | 2352 | if (cmp < 0) |
1c3c07e9 | 2353 | n = n->rb_left; |
b68572e0 | 2354 | else if (cmp > 0) |
1c3c07e9 TM |
2355 | n = n->rb_right; |
2356 | else | |
2357 | return entry; | |
1da177e4 | 2358 | } |
1c3c07e9 TM |
2359 | return NULL; |
2360 | } | |
2361 | ||
b68572e0 | 2362 | static int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block) |
1c3c07e9 TM |
2363 | { |
2364 | struct nfs_inode *nfsi = NFS_I(inode); | |
2365 | struct nfs_access_entry *cache; | |
57b69181 TM |
2366 | bool retry = true; |
2367 | int err; | |
1c3c07e9 | 2368 | |
dc59250c | 2369 | spin_lock(&inode->i_lock); |
57b69181 TM |
2370 | for(;;) { |
2371 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2372 | goto out_zap; | |
2373 | cache = nfs_access_search_rbtree(inode, cred); | |
2374 | err = -ENOENT; | |
2375 | if (cache == NULL) | |
2376 | goto out; | |
2377 | /* Found an entry, is our attribute cache valid? */ | |
21c3ba7e | 2378 | if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
57b69181 TM |
2379 | break; |
2380 | err = -ECHILD; | |
2381 | if (!may_block) | |
2382 | goto out; | |
2383 | if (!retry) | |
2384 | goto out_zap; | |
2385 | spin_unlock(&inode->i_lock); | |
2386 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
2387 | if (err) | |
2388 | return err; | |
2389 | spin_lock(&inode->i_lock); | |
2390 | retry = false; | |
2391 | } | |
1c3c07e9 TM |
2392 | res->cred = cache->cred; |
2393 | res->mask = cache->mask; | |
cfcea3e8 | 2394 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
1c3c07e9 TM |
2395 | err = 0; |
2396 | out: | |
2397 | spin_unlock(&inode->i_lock); | |
2398 | return err; | |
1c3c07e9 | 2399 | out_zap: |
1a81bb8a TM |
2400 | spin_unlock(&inode->i_lock); |
2401 | nfs_access_zap_cache(inode); | |
1c3c07e9 TM |
2402 | return -ENOENT; |
2403 | } | |
2404 | ||
b68572e0 | 2405 | static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) |
f682a398 N |
2406 | { |
2407 | /* Only check the most recently returned cache entry, | |
2408 | * but do it without locking. | |
2409 | */ | |
2410 | struct nfs_inode *nfsi = NFS_I(inode); | |
2411 | struct nfs_access_entry *cache; | |
2412 | int err = -ECHILD; | |
2413 | struct list_head *lh; | |
2414 | ||
2415 | rcu_read_lock(); | |
2416 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) | |
2417 | goto out; | |
2418 | lh = rcu_dereference(nfsi->access_cache_entry_lru.prev); | |
2419 | cache = list_entry(lh, struct nfs_access_entry, lru); | |
2420 | if (lh == &nfsi->access_cache_entry_lru || | |
2421 | cred != cache->cred) | |
2422 | cache = NULL; | |
2423 | if (cache == NULL) | |
2424 | goto out; | |
21c3ba7e | 2425 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) |
f682a398 | 2426 | goto out; |
f682a398 N |
2427 | res->cred = cache->cred; |
2428 | res->mask = cache->mask; | |
21c3ba7e | 2429 | err = 0; |
f682a398 N |
2430 | out: |
2431 | rcu_read_unlock(); | |
2432 | return err; | |
2433 | } | |
2434 | ||
1c3c07e9 TM |
2435 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
2436 | { | |
cfcea3e8 TM |
2437 | struct nfs_inode *nfsi = NFS_I(inode); |
2438 | struct rb_root *root_node = &nfsi->access_cache; | |
1c3c07e9 TM |
2439 | struct rb_node **p = &root_node->rb_node; |
2440 | struct rb_node *parent = NULL; | |
2441 | struct nfs_access_entry *entry; | |
b68572e0 | 2442 | int cmp; |
1c3c07e9 TM |
2443 | |
2444 | spin_lock(&inode->i_lock); | |
2445 | while (*p != NULL) { | |
2446 | parent = *p; | |
2447 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); | |
b68572e0 | 2448 | cmp = cred_fscmp(set->cred, entry->cred); |
1c3c07e9 | 2449 | |
b68572e0 | 2450 | if (cmp < 0) |
1c3c07e9 | 2451 | p = &parent->rb_left; |
b68572e0 | 2452 | else if (cmp > 0) |
1c3c07e9 TM |
2453 | p = &parent->rb_right; |
2454 | else | |
2455 | goto found; | |
2456 | } | |
2457 | rb_link_node(&set->rb_node, parent, p); | |
2458 | rb_insert_color(&set->rb_node, root_node); | |
cfcea3e8 | 2459 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
dc59250c | 2460 | spin_unlock(&inode->i_lock); |
1c3c07e9 TM |
2461 | return; |
2462 | found: | |
2463 | rb_replace_node(parent, &set->rb_node, root_node); | |
cfcea3e8 TM |
2464 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
2465 | list_del(&entry->lru); | |
1c3c07e9 TM |
2466 | spin_unlock(&inode->i_lock); |
2467 | nfs_access_free_entry(entry); | |
2468 | } | |
2469 | ||
6168f62c | 2470 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
1c3c07e9 TM |
2471 | { |
2472 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); | |
2473 | if (cache == NULL) | |
2474 | return; | |
2475 | RB_CLEAR_NODE(&cache->rb_node); | |
b68572e0 | 2476 | cache->cred = get_cred(set->cred); |
1da177e4 | 2477 | cache->mask = set->mask; |
1c3c07e9 | 2478 | |
f682a398 N |
2479 | /* The above field assignments must be visible |
2480 | * before this item appears on the lru. We cannot easily | |
2481 | * use rcu_assign_pointer, so just force the memory barrier. | |
2482 | */ | |
2483 | smp_wmb(); | |
1c3c07e9 | 2484 | nfs_access_add_rbtree(inode, cache); |
cfcea3e8 TM |
2485 | |
2486 | /* Update accounting */ | |
4e857c58 | 2487 | smp_mb__before_atomic(); |
cfcea3e8 | 2488 | atomic_long_inc(&nfs_access_nr_entries); |
4e857c58 | 2489 | smp_mb__after_atomic(); |
cfcea3e8 TM |
2490 | |
2491 | /* Add inode to global LRU list */ | |
1a81bb8a | 2492 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
cfcea3e8 | 2493 | spin_lock(&nfs_access_lru_lock); |
1a81bb8a TM |
2494 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
2495 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, | |
2496 | &nfs_access_lru_list); | |
cfcea3e8 TM |
2497 | spin_unlock(&nfs_access_lru_lock); |
2498 | } | |
3a505845 | 2499 | nfs_access_cache_enforce_limit(); |
1da177e4 | 2500 | } |
6168f62c WAA |
2501 | EXPORT_SYMBOL_GPL(nfs_access_add_cache); |
2502 | ||
3c181827 AS |
2503 | #define NFS_MAY_READ (NFS_ACCESS_READ) |
2504 | #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2505 | NFS_ACCESS_EXTEND | \ | |
2506 | NFS_ACCESS_DELETE) | |
2507 | #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ | |
2508 | NFS_ACCESS_EXTEND) | |
ecbb903c | 2509 | #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE |
3c181827 AS |
2510 | #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) |
2511 | #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) | |
15d4b73a | 2512 | static int |
ecbb903c | 2513 | nfs_access_calc_mask(u32 access_result, umode_t umode) |
15d4b73a TM |
2514 | { |
2515 | int mask = 0; | |
2516 | ||
2517 | if (access_result & NFS_MAY_READ) | |
2518 | mask |= MAY_READ; | |
ecbb903c TM |
2519 | if (S_ISDIR(umode)) { |
2520 | if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) | |
2521 | mask |= MAY_WRITE; | |
2522 | if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) | |
2523 | mask |= MAY_EXEC; | |
2524 | } else if (S_ISREG(umode)) { | |
2525 | if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) | |
2526 | mask |= MAY_WRITE; | |
2527 | if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) | |
2528 | mask |= MAY_EXEC; | |
2529 | } else if (access_result & NFS_MAY_WRITE) | |
2530 | mask |= MAY_WRITE; | |
15d4b73a TM |
2531 | return mask; |
2532 | } | |
2533 | ||
6168f62c WAA |
2534 | void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) |
2535 | { | |
bd8b2441 | 2536 | entry->mask = access_result; |
6168f62c WAA |
2537 | } |
2538 | EXPORT_SYMBOL_GPL(nfs_access_set_mask); | |
1da177e4 | 2539 | |
b68572e0 | 2540 | static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) |
1da177e4 LT |
2541 | { |
2542 | struct nfs_access_entry cache; | |
57b69181 | 2543 | bool may_block = (mask & MAY_NOT_BLOCK) == 0; |
bd8b2441 | 2544 | int cache_mask; |
1da177e4 LT |
2545 | int status; |
2546 | ||
f4ce1299 TM |
2547 | trace_nfs_access_enter(inode); |
2548 | ||
f682a398 N |
2549 | status = nfs_access_get_cached_rcu(inode, cred, &cache); |
2550 | if (status != 0) | |
57b69181 | 2551 | status = nfs_access_get_cached(inode, cred, &cache, may_block); |
1da177e4 | 2552 | if (status == 0) |
f4ce1299 | 2553 | goto out_cached; |
1da177e4 | 2554 | |
f3324a2a | 2555 | status = -ECHILD; |
57b69181 | 2556 | if (!may_block) |
f3324a2a N |
2557 | goto out; |
2558 | ||
1750d929 AS |
2559 | /* |
2560 | * Determine which access bits we want to ask for... | |
2561 | */ | |
2562 | cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; | |
2563 | if (S_ISDIR(inode->i_mode)) | |
2564 | cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; | |
2565 | else | |
2566 | cache.mask |= NFS_ACCESS_EXECUTE; | |
1da177e4 | 2567 | cache.cred = cred; |
1da177e4 | 2568 | status = NFS_PROTO(inode)->access(inode, &cache); |
a71ee337 SJ |
2569 | if (status != 0) { |
2570 | if (status == -ESTALE) { | |
2571 | nfs_zap_caches(inode); | |
2572 | if (!S_ISDIR(inode->i_mode)) | |
2573 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
2574 | } | |
f4ce1299 | 2575 | goto out; |
a71ee337 | 2576 | } |
1da177e4 | 2577 | nfs_access_add_cache(inode, &cache); |
f4ce1299 | 2578 | out_cached: |
ecbb903c | 2579 | cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); |
bd8b2441 | 2580 | if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) |
f4ce1299 | 2581 | status = -EACCES; |
1da177e4 | 2582 | out: |
f4ce1299 TM |
2583 | trace_nfs_access_exit(inode, status); |
2584 | return status; | |
1da177e4 LT |
2585 | } |
2586 | ||
af22f94a TM |
2587 | static int nfs_open_permission_mask(int openflags) |
2588 | { | |
2589 | int mask = 0; | |
2590 | ||
f8d9a897 WAA |
2591 | if (openflags & __FMODE_EXEC) { |
2592 | /* ONLY check exec rights */ | |
2593 | mask = MAY_EXEC; | |
2594 | } else { | |
2595 | if ((openflags & O_ACCMODE) != O_WRONLY) | |
2596 | mask |= MAY_READ; | |
2597 | if ((openflags & O_ACCMODE) != O_RDONLY) | |
2598 | mask |= MAY_WRITE; | |
2599 | } | |
2600 | ||
af22f94a TM |
2601 | return mask; |
2602 | } | |
2603 | ||
b68572e0 | 2604 | int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) |
af22f94a TM |
2605 | { |
2606 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); | |
2607 | } | |
89d77c8f | 2608 | EXPORT_SYMBOL_GPL(nfs_may_open); |
af22f94a | 2609 | |
5c5fc09a TM |
2610 | static int nfs_execute_ok(struct inode *inode, int mask) |
2611 | { | |
2612 | struct nfs_server *server = NFS_SERVER(inode); | |
21c3ba7e | 2613 | int ret = 0; |
5c5fc09a | 2614 | |
3825827e TM |
2615 | if (S_ISDIR(inode->i_mode)) |
2616 | return 0; | |
cf834027 | 2617 | if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_OTHER)) { |
21c3ba7e TM |
2618 | if (mask & MAY_NOT_BLOCK) |
2619 | return -ECHILD; | |
2620 | ret = __nfs_revalidate_inode(server, inode); | |
2621 | } | |
5c5fc09a TM |
2622 | if (ret == 0 && !execute_ok(inode)) |
2623 | ret = -EACCES; | |
2624 | return ret; | |
2625 | } | |
2626 | ||
10556cb2 | 2627 | int nfs_permission(struct inode *inode, int mask) |
1da177e4 | 2628 | { |
b68572e0 | 2629 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2630 | int res = 0; |
2631 | ||
91d5b470 CL |
2632 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
2633 | ||
e6305c43 | 2634 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
1da177e4 LT |
2635 | goto out; |
2636 | /* Is this sys_access() ? */ | |
9cfcac81 | 2637 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
1da177e4 LT |
2638 | goto force_lookup; |
2639 | ||
2640 | switch (inode->i_mode & S_IFMT) { | |
2641 | case S_IFLNK: | |
2642 | goto out; | |
2643 | case S_IFREG: | |
762674f8 TM |
2644 | if ((mask & MAY_OPEN) && |
2645 | nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) | |
2646 | return 0; | |
1da177e4 LT |
2647 | break; |
2648 | case S_IFDIR: | |
2649 | /* | |
2650 | * Optimize away all write operations, since the server | |
2651 | * will check permissions when we perform the op. | |
2652 | */ | |
2653 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) | |
2654 | goto out; | |
2655 | } | |
2656 | ||
2657 | force_lookup: | |
1da177e4 LT |
2658 | if (!NFS_PROTO(inode)->access) |
2659 | goto out_notsup; | |
2660 | ||
f3324a2a N |
2661 | /* Always try fast lookups first */ |
2662 | rcu_read_lock(); | |
b68572e0 | 2663 | res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK); |
f3324a2a N |
2664 | rcu_read_unlock(); |
2665 | if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) { | |
2666 | /* Fast lookup failed, try the slow way */ | |
b68572e0 | 2667 | res = nfs_do_access(inode, cred, mask); |
f3324a2a | 2668 | } |
1da177e4 | 2669 | out: |
5c5fc09a TM |
2670 | if (!res && (mask & MAY_EXEC)) |
2671 | res = nfs_execute_ok(inode, mask); | |
f696a365 | 2672 | |
1e8968c5 | 2673 | dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", |
1e7cb3dc | 2674 | inode->i_sb->s_id, inode->i_ino, mask, res); |
1da177e4 LT |
2675 | return res; |
2676 | out_notsup: | |
d51ac1a8 N |
2677 | if (mask & MAY_NOT_BLOCK) |
2678 | return -ECHILD; | |
2679 | ||
1da177e4 LT |
2680 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
2681 | if (res == 0) | |
2830ba7f | 2682 | res = generic_permission(inode, mask); |
1e7cb3dc | 2683 | goto out; |
1da177e4 | 2684 | } |
ddda8e0a | 2685 | EXPORT_SYMBOL_GPL(nfs_permission); |
1da177e4 LT |
2686 | |
2687 | /* | |
2688 | * Local variables: | |
2689 | * version-control: t | |
2690 | * kept-new-versions: 5 | |
2691 | * End: | |
2692 | */ |