Commit | Line | Data |
---|---|---|
2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
2bad8471 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
2bad8471 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/namei.h> | |
35 | #include <linux/idr.h> | |
e8edc6e0 | 36 | #include <linux/sched.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
ebf46264 | 38 | #include <linux/xattr.h> |
85ff872d | 39 | #include <linux/posix_acl.h> |
bd238fb4 LI |
40 | #include <net/9p/9p.h> |
41 | #include <net/9p/client.h> | |
2bad8471 | 42 | |
2bad8471 | 43 | #include "v9fs.h" |
2bad8471 | 44 | #include "v9fs_vfs.h" |
2bad8471 | 45 | #include "fid.h" |
60e78d2c | 46 | #include "cache.h" |
ebf46264 | 47 | #include "xattr.h" |
85ff872d | 48 | #include "acl.h" |
2bad8471 | 49 | |
754661f1 | 50 | static const struct inode_operations v9fs_dir_inode_operations; |
9b6533c9 SK |
51 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
52 | static const struct inode_operations v9fs_dir_inode_operations_dotl; | |
754661f1 | 53 | static const struct inode_operations v9fs_file_inode_operations; |
9b6533c9 | 54 | static const struct inode_operations v9fs_file_inode_operations_dotl; |
754661f1 | 55 | static const struct inode_operations v9fs_symlink_inode_operations; |
9b6533c9 | 56 | static const struct inode_operations v9fs_symlink_inode_operations_dotl; |
2bad8471 EVH |
57 | |
58 | /** | |
59 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
60 | * @v9ses: v9fs session information | |
61 | * @mode: mode to convert | |
62 | * | |
63 | */ | |
64 | ||
73c592b9 | 65 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
66 | { |
67 | int res; | |
68 | res = mode & 0777; | |
69 | if (S_ISDIR(mode)) | |
bd238fb4 | 70 | res |= P9_DMDIR; |
dd6102fb | 71 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 72 | if (S_ISLNK(mode)) |
bd238fb4 | 73 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
74 | if (v9ses->nodev == 0) { |
75 | if (S_ISSOCK(mode)) | |
bd238fb4 | 76 | res |= P9_DMSOCKET; |
2bad8471 | 77 | if (S_ISFIFO(mode)) |
bd238fb4 | 78 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 79 | if (S_ISBLK(mode)) |
bd238fb4 | 80 | res |= P9_DMDEVICE; |
2bad8471 | 81 | if (S_ISCHR(mode)) |
bd238fb4 | 82 | res |= P9_DMDEVICE; |
2bad8471 EVH |
83 | } |
84 | ||
85 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 86 | res |= P9_DMSETUID; |
2bad8471 | 87 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 88 | res |= P9_DMSETGID; |
d199d652 AL |
89 | if ((mode & S_ISVTX) == S_ISVTX) |
90 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
91 | if ((mode & P9_DMLINK)) |
92 | res |= P9_DMLINK; | |
2bad8471 EVH |
93 | } |
94 | ||
95 | return res; | |
96 | } | |
97 | ||
98 | /** | |
99 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
100 | * @v9ses: v9fs session information | |
101 | * @mode: mode to convert | |
102 | * | |
103 | */ | |
104 | ||
73c592b9 | 105 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
106 | { |
107 | int res; | |
108 | ||
109 | res = mode & 0777; | |
110 | ||
bd238fb4 | 111 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 112 | res |= S_IFDIR; |
dd6102fb | 113 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 114 | res |= S_IFLNK; |
dd6102fb | 115 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
116 | && (v9ses->nodev == 0)) |
117 | res |= S_IFSOCK; | |
dd6102fb | 118 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
119 | && (v9ses->nodev == 0)) |
120 | res |= S_IFIFO; | |
dd6102fb | 121 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
122 | && (v9ses->nodev == 0)) |
123 | res |= S_IFBLK; | |
124 | else | |
125 | res |= S_IFREG; | |
126 | ||
dd6102fb | 127 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 128 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
129 | res |= S_ISUID; |
130 | ||
bd238fb4 | 131 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 132 | res |= S_ISGID; |
d199d652 AL |
133 | |
134 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
135 | res |= S_ISVTX; | |
2bad8471 EVH |
136 | } |
137 | ||
138 | return res; | |
139 | } | |
140 | ||
ee443996 EVH |
141 | /** |
142 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
143 | * @uflags: flags to convert | |
2e4bef41 | 144 | * @extended: if .u extensions are active |
ee443996 EVH |
145 | */ |
146 | ||
2e4bef41 | 147 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
148 | { |
149 | int ret; | |
150 | ||
151 | ret = 0; | |
152 | switch (uflags&3) { | |
153 | default: | |
154 | case O_RDONLY: | |
bd238fb4 | 155 | ret = P9_OREAD; |
6a3124a3 LI |
156 | break; |
157 | ||
158 | case O_WRONLY: | |
bd238fb4 | 159 | ret = P9_OWRITE; |
6a3124a3 LI |
160 | break; |
161 | ||
162 | case O_RDWR: | |
bd238fb4 | 163 | ret = P9_ORDWR; |
6a3124a3 LI |
164 | break; |
165 | } | |
166 | ||
6a3124a3 | 167 | if (uflags & O_TRUNC) |
bd238fb4 | 168 | ret |= P9_OTRUNC; |
6a3124a3 | 169 | |
2e4bef41 EVH |
170 | if (extended) { |
171 | if (uflags & O_EXCL) | |
172 | ret |= P9_OEXCL; | |
173 | ||
174 | if (uflags & O_APPEND) | |
175 | ret |= P9_OAPPEND; | |
176 | } | |
6a3124a3 LI |
177 | |
178 | return ret; | |
179 | } | |
180 | ||
2bad8471 | 181 | /** |
531b1094 | 182 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 183 | * @wstat: structure to initialize |
2bad8471 EVH |
184 | * |
185 | */ | |
186 | ||
7a4439c4 | 187 | void |
bd238fb4 | 188 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 189 | { |
531b1094 LI |
190 | wstat->type = ~0; |
191 | wstat->dev = ~0; | |
192 | wstat->qid.type = ~0; | |
193 | wstat->qid.version = ~0; | |
194 | *((long long *)&wstat->qid.path) = ~0; | |
195 | wstat->mode = ~0; | |
196 | wstat->atime = ~0; | |
197 | wstat->mtime = ~0; | |
198 | wstat->length = ~0; | |
199 | wstat->name = NULL; | |
200 | wstat->uid = NULL; | |
201 | wstat->gid = NULL; | |
202 | wstat->muid = NULL; | |
203 | wstat->n_uid = ~0; | |
204 | wstat->n_gid = ~0; | |
205 | wstat->n_muid = ~0; | |
206 | wstat->extension = NULL; | |
2bad8471 EVH |
207 | } |
208 | ||
60e78d2c AK |
209 | #ifdef CONFIG_9P_FSCACHE |
210 | /** | |
211 | * v9fs_alloc_inode - helper function to allocate an inode | |
212 | * This callback is executed before setting up the inode so that we | |
213 | * can associate a vcookie with each inode. | |
214 | * | |
215 | */ | |
216 | ||
217 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
218 | { | |
219 | struct v9fs_cookie *vcookie; | |
220 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
221 | GFP_KERNEL); | |
222 | if (!vcookie) | |
223 | return NULL; | |
224 | ||
225 | vcookie->fscache = NULL; | |
226 | vcookie->qid = NULL; | |
227 | spin_lock_init(&vcookie->lock); | |
228 | return &vcookie->inode; | |
229 | } | |
230 | ||
231 | /** | |
232 | * v9fs_destroy_inode - destroy an inode | |
233 | * | |
234 | */ | |
235 | ||
236 | void v9fs_destroy_inode(struct inode *inode) | |
237 | { | |
238 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); | |
239 | } | |
240 | #endif | |
241 | ||
09d34ee5 EVH |
242 | /** |
243 | * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a | |
244 | * new file system object. This checks the S_ISGID to determine the owning | |
245 | * group of the new file system object. | |
246 | */ | |
247 | ||
248 | static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) | |
249 | { | |
250 | BUG_ON(dir_inode == NULL); | |
251 | ||
252 | if (dir_inode->i_mode & S_ISGID) { | |
253 | /* set_gid bit is set.*/ | |
254 | return dir_inode->i_gid; | |
255 | } | |
256 | return current_fsgid(); | |
257 | } | |
258 | ||
259 | /** | |
260 | * v9fs_dentry_from_dir_inode - helper function to get the dentry from | |
261 | * dir inode. | |
262 | * | |
263 | */ | |
264 | ||
ea137533 | 265 | static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode) |
09d34ee5 EVH |
266 | { |
267 | struct dentry *dentry; | |
268 | ||
269 | spin_lock(&dcache_lock); | |
270 | /* Directory should have only one entry. */ | |
271 | BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry)); | |
272 | dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias); | |
273 | spin_unlock(&dcache_lock); | |
274 | return dentry; | |
275 | } | |
276 | ||
2bad8471 EVH |
277 | /** |
278 | * v9fs_get_inode - helper function to setup an inode | |
279 | * @sb: superblock | |
280 | * @mode: mode to setup inode with | |
281 | * | |
282 | */ | |
283 | ||
284 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
285 | { | |
2bb54115 | 286 | int err; |
6a3124a3 | 287 | struct inode *inode; |
b501611a | 288 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 289 | |
bd238fb4 | 290 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
291 | |
292 | inode = new_inode(sb); | |
2bb54115 AK |
293 | if (!inode) { |
294 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 295 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
296 | } |
297 | ||
217f206d | 298 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
299 | inode->i_blocks = 0; |
300 | inode->i_rdev = 0; | |
301 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
302 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
303 | ||
304 | switch (mode & S_IFMT) { | |
305 | case S_IFIFO: | |
306 | case S_IFBLK: | |
307 | case S_IFCHR: | |
308 | case S_IFSOCK: | |
4b43516a MK |
309 | if (v9fs_proto_dotl(v9ses)) { |
310 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
311 | inode->i_fop = &v9fs_file_operations_dotl; | |
312 | } else if (v9fs_proto_dotu(v9ses)) { | |
313 | inode->i_op = &v9fs_file_inode_operations; | |
314 | inode->i_fop = &v9fs_file_operations; | |
315 | } else { | |
bd238fb4 | 316 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
317 | "special files without extended mode\n"); |
318 | err = -EINVAL; | |
319 | goto error; | |
2bad8471 | 320 | } |
2bb54115 AK |
321 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
322 | break; | |
323 | case S_IFREG: | |
9b6533c9 SK |
324 | if (v9fs_proto_dotl(v9ses)) { |
325 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
326 | inode->i_fop = &v9fs_file_operations_dotl; | |
327 | } else { | |
328 | inode->i_op = &v9fs_file_inode_operations; | |
329 | inode->i_fop = &v9fs_file_operations; | |
330 | } | |
331 | ||
2bb54115 | 332 | break; |
9b6533c9 | 333 | |
2bb54115 | 334 | case S_IFLNK: |
9b6533c9 SK |
335 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
336 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
337 | "legacy protocol.\n"); | |
2bb54115 AK |
338 | err = -EINVAL; |
339 | goto error; | |
340 | } | |
9b6533c9 SK |
341 | |
342 | if (v9fs_proto_dotl(v9ses)) | |
343 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
344 | else | |
345 | inode->i_op = &v9fs_symlink_inode_operations; | |
346 | ||
2bb54115 AK |
347 | break; |
348 | case S_IFDIR: | |
349 | inc_nlink(inode); | |
9b6533c9 SK |
350 | if (v9fs_proto_dotl(v9ses)) |
351 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
352 | else if (v9fs_proto_dotu(v9ses)) | |
353 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
354 | else |
355 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
356 | |
357 | if (v9fs_proto_dotl(v9ses)) | |
358 | inode->i_fop = &v9fs_dir_operations_dotl; | |
359 | else | |
360 | inode->i_fop = &v9fs_dir_operations; | |
361 | ||
2bb54115 AK |
362 | break; |
363 | default: | |
364 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
365 | mode, mode & S_IFMT); | |
366 | err = -EINVAL; | |
367 | goto error; | |
2bad8471 | 368 | } |
2bb54115 | 369 | |
2bad8471 | 370 | return inode; |
2bb54115 AK |
371 | |
372 | error: | |
373 | iput(inode); | |
374 | return ERR_PTR(err); | |
2bad8471 EVH |
375 | } |
376 | ||
bd238fb4 | 377 | /* |
6a3124a3 LI |
378 | static struct v9fs_fid* |
379 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
380 | { | |
381 | int err; | |
736c4b85 | 382 | int nfid; |
6a3124a3 LI |
383 | struct v9fs_fid *ret; |
384 | struct v9fs_fcall *fcall; | |
385 | ||
386 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
387 | if (nfid < 0) { | |
0b8dd177 | 388 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 389 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
390 | } |
391 | ||
6a3124a3 LI |
392 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
393 | &fcall); | |
394 | ||
395 | if (err < 0) { | |
41e5a6ac LI |
396 | if (fcall && fcall->id == RWALK) |
397 | goto clunk_fid; | |
398 | ||
6a3124a3 LI |
399 | PRINT_FCALL_ERROR("walk error", fcall); |
400 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
401 | goto error; | |
0b8dd177 | 402 | } |
6a3124a3 | 403 | |
3cf6429a LI |
404 | kfree(fcall); |
405 | fcall = NULL; | |
6a3124a3 LI |
406 | ret = v9fs_fid_create(v9ses, nfid); |
407 | if (!ret) { | |
408 | err = -ENOMEM; | |
409 | goto clunk_fid; | |
410 | } | |
0b8dd177 | 411 | |
6a3124a3 LI |
412 | err = v9fs_fid_insert(ret, dentry); |
413 | if (err < 0) { | |
414 | v9fs_fid_destroy(ret); | |
415 | goto clunk_fid; | |
0b8dd177 | 416 | } |
2bad8471 | 417 | |
6a3124a3 | 418 | return ret; |
2bad8471 | 419 | |
6a3124a3 LI |
420 | clunk_fid: |
421 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 422 | |
6a3124a3 LI |
423 | error: |
424 | kfree(fcall); | |
425 | return ERR_PTR(err); | |
426 | } | |
bd238fb4 | 427 | */ |
2bad8471 | 428 | |
60e78d2c AK |
429 | |
430 | /** | |
431 | * v9fs_clear_inode - release an inode | |
432 | * @inode: inode to release | |
433 | * | |
434 | */ | |
b57922d9 | 435 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 436 | { |
b57922d9 AV |
437 | truncate_inode_pages(inode->i_mapping, 0); |
438 | end_writeback(inode); | |
60e78d2c AK |
439 | filemap_fdatawrite(inode->i_mapping); |
440 | ||
441 | #ifdef CONFIG_9P_FSCACHE | |
442 | v9fs_cache_inode_put_cookie(inode); | |
443 | #endif | |
444 | } | |
445 | ||
5174fdab | 446 | static struct inode * |
f0853122 | 447 | v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
448 | struct super_block *sb) |
449 | { | |
450 | int err, umode; | |
f0853122 | 451 | struct inode *ret = NULL; |
51a87c55 | 452 | struct p9_wstat *st; |
531b1094 | 453 | |
bd238fb4 | 454 | st = p9_client_stat(fid); |
02bc3567 AK |
455 | if (IS_ERR(st)) |
456 | return ERR_CAST(st); | |
2bad8471 | 457 | |
bd238fb4 | 458 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
459 | ret = v9fs_get_inode(sb, umode); |
460 | if (IS_ERR(ret)) { | |
461 | err = PTR_ERR(ret); | |
6a3124a3 LI |
462 | goto error; |
463 | } | |
2bad8471 | 464 | |
bd238fb4 LI |
465 | v9fs_stat2inode(st, ret, sb); |
466 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
467 | |
468 | #ifdef CONFIG_9P_FSCACHE | |
469 | v9fs_vcookie_set_qid(ret, &st->qid); | |
470 | v9fs_cache_inode_get_cookie(ret); | |
471 | #endif | |
02bc3567 | 472 | p9stat_free(st); |
bd238fb4 | 473 | kfree(st); |
6a3124a3 | 474 | return ret; |
6a3124a3 | 475 | error: |
02bc3567 | 476 | p9stat_free(st); |
bd238fb4 | 477 | kfree(st); |
6a3124a3 | 478 | return ERR_PTR(err); |
2bad8471 EVH |
479 | } |
480 | ||
f0853122 SK |
481 | static struct inode * |
482 | v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, | |
483 | struct super_block *sb) | |
484 | { | |
485 | struct inode *ret = NULL; | |
486 | int err; | |
487 | struct p9_stat_dotl *st; | |
488 | ||
489 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
490 | if (IS_ERR(st)) | |
491 | return ERR_CAST(st); | |
492 | ||
493 | ret = v9fs_get_inode(sb, st->st_mode); | |
494 | if (IS_ERR(ret)) { | |
495 | err = PTR_ERR(ret); | |
496 | goto error; | |
497 | } | |
498 | ||
499 | v9fs_stat2inode_dotl(st, ret); | |
500 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
501 | #ifdef CONFIG_9P_FSCACHE | |
502 | v9fs_vcookie_set_qid(ret, &st->qid); | |
503 | v9fs_cache_inode_get_cookie(ret); | |
504 | #endif | |
85ff872d AK |
505 | err = v9fs_get_acl(ret, fid); |
506 | if (err) { | |
507 | iput(ret); | |
508 | goto error; | |
509 | } | |
f0853122 SK |
510 | kfree(st); |
511 | return ret; | |
512 | error: | |
513 | kfree(st); | |
514 | return ERR_PTR(err); | |
515 | } | |
516 | ||
517 | /** | |
518 | * v9fs_inode_from_fid - Helper routine to populate an inode by | |
519 | * issuing a attribute request | |
520 | * @v9ses: session information | |
521 | * @fid: fid to issue attribute request for | |
522 | * @sb: superblock on which to create inode | |
523 | * | |
524 | */ | |
525 | static inline struct inode * | |
526 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, | |
527 | struct super_block *sb) | |
528 | { | |
529 | if (v9fs_proto_dotl(v9ses)) | |
530 | return v9fs_inode_dotl(v9ses, fid, sb); | |
531 | else | |
532 | return v9fs_inode(v9ses, fid, sb); | |
533 | } | |
534 | ||
2bad8471 EVH |
535 | /** |
536 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
537 | * @dir: directory inode that is being deleted |
538 | * @file: dentry that is being deleted | |
539 | * @rmdir: removing a directory | |
2bad8471 EVH |
540 | * |
541 | */ | |
542 | ||
543 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
544 | { | |
d994f405 | 545 | int retval; |
bd238fb4 | 546 | struct inode *file_inode; |
bd238fb4 | 547 | struct p9_fid *v9fid; |
2bad8471 | 548 | |
bd238fb4 | 549 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
550 | rmdir); |
551 | ||
552 | file_inode = file->d_inode; | |
c959df9f | 553 | v9fid = v9fs_fid_clone(file); |
ba17674f | 554 | if (IS_ERR(v9fid)) |
da977b2c | 555 | return PTR_ERR(v9fid); |
2bad8471 | 556 | |
d994f405 AK |
557 | retval = p9_client_remove(v9fid); |
558 | if (!retval) | |
559 | drop_nlink(file_inode); | |
560 | return retval; | |
2bad8471 EVH |
561 | } |
562 | ||
6a3124a3 LI |
563 | static int |
564 | v9fs_open_created(struct inode *inode, struct file *file) | |
565 | { | |
566 | return 0; | |
567 | } | |
568 | ||
bd238fb4 | 569 | |
2bad8471 | 570 | /** |
bd238fb4 | 571 | * v9fs_create - Create a file |
ee443996 EVH |
572 | * @v9ses: session information |
573 | * @dir: directory that dentry is being created in | |
bd238fb4 | 574 | * @dentry: dentry that is being created |
0e15597e | 575 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
576 | * @perm: create permissions |
577 | * @mode: open mode | |
2bad8471 EVH |
578 | * |
579 | */ | |
bd238fb4 LI |
580 | static struct p9_fid * |
581 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
582 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 583 | { |
6a3124a3 | 584 | int err; |
bd238fb4 LI |
585 | char *name; |
586 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 587 | struct inode *inode; |
6a3124a3 | 588 | |
51a87c55 EVH |
589 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
590 | ||
bd238fb4 LI |
591 | err = 0; |
592 | ofid = NULL; | |
593 | fid = NULL; | |
594 | name = (char *) dentry->d_name.name; | |
6d27e64d | 595 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 596 | if (IS_ERR(dfid)) { |
da977b2c | 597 | err = PTR_ERR(dfid); |
6d27e64d VJ |
598 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
599 | return ERR_PTR(err); | |
da977b2c | 600 | } |
6a3124a3 | 601 | |
bd238fb4 LI |
602 | /* clone a fid to use for creation */ |
603 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
604 | if (IS_ERR(ofid)) { | |
605 | err = PTR_ERR(ofid); | |
51a87c55 | 606 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 607 | return ERR_PTR(err); |
bd238fb4 | 608 | } |
6a3124a3 | 609 | |
bd238fb4 | 610 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
611 | if (err < 0) { |
612 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 613 | goto error; |
51a87c55 | 614 | } |
6a3124a3 | 615 | |
bd238fb4 | 616 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 617 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
618 | if (IS_ERR(fid)) { |
619 | err = PTR_ERR(fid); | |
51a87c55 | 620 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 621 | fid = NULL; |
6a3124a3 | 622 | goto error; |
6d27e64d | 623 | } |
6a3124a3 | 624 | |
bd238fb4 LI |
625 | /* instantiate inode and assign the unopened fid to the dentry */ |
626 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
627 | if (IS_ERR(inode)) { |
628 | err = PTR_ERR(inode); | |
51a87c55 | 629 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
630 | goto error; |
631 | } | |
632 | ||
ba17674f | 633 | if (v9ses->cache) |
e03abc0c EVH |
634 | dentry->d_op = &v9fs_cached_dentry_operations; |
635 | else | |
636 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 637 | |
6a3124a3 | 638 | d_instantiate(dentry, inode); |
50fb6d2b AK |
639 | err = v9fs_fid_add(dentry, fid); |
640 | if (err < 0) | |
641 | goto error; | |
642 | ||
bd238fb4 | 643 | return ofid; |
6a3124a3 | 644 | |
bd238fb4 | 645 | error: |
bd238fb4 LI |
646 | if (ofid) |
647 | p9_client_clunk(ofid); | |
648 | ||
649 | if (fid) | |
650 | p9_client_clunk(fid); | |
651 | ||
652 | return ERR_PTR(err); | |
653 | } | |
654 | ||
5643135a VJJ |
655 | /** |
656 | * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. | |
657 | * @dir: directory inode that is being created | |
658 | * @dentry: dentry that is being deleted | |
659 | * @mode: create permissions | |
660 | * @nd: path information | |
661 | * | |
662 | */ | |
663 | ||
664 | static int | |
ad77dbce | 665 | v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode, |
5643135a VJJ |
666 | struct nameidata *nd) |
667 | { | |
668 | int err = 0; | |
669 | char *name = NULL; | |
670 | gid_t gid; | |
671 | int flags; | |
ad77dbce | 672 | mode_t mode; |
5643135a VJJ |
673 | struct v9fs_session_info *v9ses; |
674 | struct p9_fid *fid = NULL; | |
675 | struct p9_fid *dfid, *ofid; | |
676 | struct file *filp; | |
677 | struct p9_qid qid; | |
678 | struct inode *inode; | |
ad77dbce | 679 | struct posix_acl *pacl = NULL, *dacl = NULL; |
5643135a VJJ |
680 | |
681 | v9ses = v9fs_inode2v9ses(dir); | |
682 | if (nd && nd->flags & LOOKUP_OPEN) | |
683 | flags = nd->intent.open.flags - 1; | |
684 | else | |
685 | flags = O_RDWR; | |
686 | ||
687 | name = (char *) dentry->d_name.name; | |
688 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x " | |
ad77dbce | 689 | "mode:0x%x\n", name, flags, omode); |
5643135a VJJ |
690 | |
691 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
692 | if (IS_ERR(dfid)) { | |
693 | err = PTR_ERR(dfid); | |
694 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
695 | return err; | |
696 | } | |
697 | ||
698 | /* clone a fid to use for creation */ | |
699 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
700 | if (IS_ERR(ofid)) { | |
701 | err = PTR_ERR(ofid); | |
702 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); | |
703 | return err; | |
704 | } | |
705 | ||
706 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
707 | |
708 | mode = omode; | |
709 | /* Update mode based on ACL value */ | |
710 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
711 | if (err) { | |
712 | P9_DPRINTK(P9_DEBUG_VFS, | |
713 | "Failed to get acl values in creat %d\n", err); | |
714 | goto error; | |
715 | } | |
5643135a VJJ |
716 | err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid); |
717 | if (err < 0) { | |
718 | P9_DPRINTK(P9_DEBUG_VFS, | |
719 | "p9_client_open_dotl failed in creat %d\n", | |
720 | err); | |
721 | goto error; | |
722 | } | |
ad77dbce AK |
723 | /* instantiate inode and assign the unopened fid to the dentry */ |
724 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE || | |
725 | (nd && nd->flags & LOOKUP_OPEN)) { | |
726 | fid = p9_client_walk(dfid, 1, &name, 1); | |
727 | if (IS_ERR(fid)) { | |
728 | err = PTR_ERR(fid); | |
729 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
730 | err); | |
731 | fid = NULL; | |
732 | goto error; | |
733 | } | |
5643135a | 734 | |
ad77dbce AK |
735 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
736 | if (IS_ERR(inode)) { | |
737 | err = PTR_ERR(inode); | |
738 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
739 | err); | |
740 | goto error; | |
741 | } | |
3c30750f | 742 | dentry->d_op = &v9fs_cached_dentry_operations; |
ad77dbce AK |
743 | d_instantiate(dentry, inode); |
744 | err = v9fs_fid_add(dentry, fid); | |
745 | if (err < 0) | |
746 | goto error; | |
747 | /* The fid would get clunked via a dput */ | |
748 | fid = NULL; | |
749 | } else { | |
750 | /* | |
751 | * Not in cached mode. No need to populate | |
752 | * inode with stat. We need to get an inode | |
753 | * so that we can set the acl with dentry | |
754 | */ | |
755 | inode = v9fs_get_inode(dir->i_sb, mode); | |
756 | if (IS_ERR(inode)) { | |
757 | err = PTR_ERR(inode); | |
758 | goto error; | |
759 | } | |
3c30750f | 760 | dentry->d_op = &v9fs_dentry_operations; |
ad77dbce AK |
761 | d_instantiate(dentry, inode); |
762 | } | |
763 | /* Now set the ACL based on the default value */ | |
764 | v9fs_set_create_acl(dentry, dacl, pacl); | |
5643135a VJJ |
765 | |
766 | /* if we are opening a file, assign the open fid to the file */ | |
767 | if (nd && nd->flags & LOOKUP_OPEN) { | |
768 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); | |
769 | if (IS_ERR(filp)) { | |
770 | p9_client_clunk(ofid); | |
771 | return PTR_ERR(filp); | |
772 | } | |
773 | filp->private_data = ofid; | |
774 | } else | |
775 | p9_client_clunk(ofid); | |
776 | ||
777 | return 0; | |
778 | ||
779 | error: | |
780 | if (ofid) | |
781 | p9_client_clunk(ofid); | |
782 | if (fid) | |
783 | p9_client_clunk(fid); | |
784 | return err; | |
785 | } | |
786 | ||
bd238fb4 LI |
787 | /** |
788 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 789 | * @dir: directory inode that is being created |
bd238fb4 LI |
790 | * @dentry: dentry that is being deleted |
791 | * @mode: create permissions | |
792 | * @nd: path information | |
793 | * | |
794 | */ | |
6a3124a3 | 795 | |
bd238fb4 LI |
796 | static int |
797 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
798 | struct nameidata *nd) | |
799 | { | |
800 | int err; | |
801 | u32 perm; | |
802 | int flags; | |
803 | struct v9fs_session_info *v9ses; | |
804 | struct p9_fid *fid; | |
805 | struct file *filp; | |
806 | ||
807 | err = 0; | |
808 | fid = NULL; | |
809 | v9ses = v9fs_inode2v9ses(dir); | |
810 | perm = unixmode2p9mode(v9ses, mode); | |
811 | if (nd && nd->flags & LOOKUP_OPEN) | |
812 | flags = nd->intent.open.flags - 1; | |
813 | else | |
814 | flags = O_RDWR; | |
815 | ||
816 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
817 | v9fs_uflags2omode(flags, |
818 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
819 | if (IS_ERR(fid)) { |
820 | err = PTR_ERR(fid); | |
821 | fid = NULL; | |
822 | goto error; | |
823 | } | |
824 | ||
825 | /* if we are opening a file, assign the open fid to the file */ | |
826 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
827 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
828 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
829 | err = PTR_ERR(filp); |
830 | goto error; | |
6a3124a3 LI |
831 | } |
832 | ||
bd238fb4 LI |
833 | filp->private_data = fid; |
834 | } else | |
835 | p9_client_clunk(fid); | |
6a3124a3 LI |
836 | |
837 | return 0; | |
838 | ||
839 | error: | |
bd238fb4 LI |
840 | if (fid) |
841 | p9_client_clunk(fid); | |
6a3124a3 | 842 | |
6a3124a3 | 843 | return err; |
2bad8471 EVH |
844 | } |
845 | ||
846 | /** | |
847 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 848 | * @dir: inode that is being unlinked |
2bad8471 EVH |
849 | * @dentry: dentry that is being unlinked |
850 | * @mode: mode for new directory | |
851 | * | |
852 | */ | |
853 | ||
6a3124a3 | 854 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 855 | { |
6a3124a3 | 856 | int err; |
bd238fb4 | 857 | u32 perm; |
6a3124a3 | 858 | struct v9fs_session_info *v9ses; |
bd238fb4 | 859 | struct p9_fid *fid; |
6a3124a3 | 860 | |
bd238fb4 LI |
861 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
862 | err = 0; | |
6a3124a3 | 863 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 864 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
865 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
866 | if (IS_ERR(fid)) { | |
867 | err = PTR_ERR(fid); | |
868 | fid = NULL; | |
6a3124a3 LI |
869 | } |
870 | ||
bd238fb4 LI |
871 | if (fid) |
872 | p9_client_clunk(fid); | |
6a3124a3 | 873 | |
6a3124a3 | 874 | return err; |
2bad8471 EVH |
875 | } |
876 | ||
01a622bd MK |
877 | |
878 | /** | |
879 | * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory | |
880 | * @dir: inode that is being unlinked | |
881 | * @dentry: dentry that is being unlinked | |
882 | * @mode: mode for new directory | |
883 | * | |
884 | */ | |
885 | ||
ad77dbce AK |
886 | static int v9fs_vfs_mkdir_dotl(struct inode *dir, |
887 | struct dentry *dentry, int omode) | |
01a622bd MK |
888 | { |
889 | int err; | |
890 | struct v9fs_session_info *v9ses; | |
891 | struct p9_fid *fid = NULL, *dfid = NULL; | |
892 | gid_t gid; | |
893 | char *name; | |
ad77dbce | 894 | mode_t mode; |
01a622bd MK |
895 | struct inode *inode; |
896 | struct p9_qid qid; | |
897 | struct dentry *dir_dentry; | |
ad77dbce | 898 | struct posix_acl *dacl = NULL, *pacl = NULL; |
01a622bd MK |
899 | |
900 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); | |
901 | err = 0; | |
902 | v9ses = v9fs_inode2v9ses(dir); | |
903 | ||
ad77dbce | 904 | omode |= S_IFDIR; |
7c7298cf | 905 | if (dir->i_mode & S_ISGID) |
ad77dbce AK |
906 | omode |= S_ISGID; |
907 | ||
01a622bd MK |
908 | dir_dentry = v9fs_dentry_from_dir_inode(dir); |
909 | dfid = v9fs_fid_lookup(dir_dentry); | |
910 | if (IS_ERR(dfid)) { | |
911 | err = PTR_ERR(dfid); | |
912 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
913 | dfid = NULL; | |
914 | goto error; | |
915 | } | |
916 | ||
917 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
918 | mode = omode; |
919 | /* Update mode based on ACL value */ | |
920 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
921 | if (err) { | |
922 | P9_DPRINTK(P9_DEBUG_VFS, | |
923 | "Failed to get acl values in mkdir %d\n", err); | |
924 | goto error; | |
925 | } | |
01a622bd MK |
926 | name = (char *) dentry->d_name.name; |
927 | err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); | |
928 | if (err < 0) | |
929 | goto error; | |
930 | ||
931 | /* instantiate inode and assign the unopened fid to the dentry */ | |
932 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
933 | fid = p9_client_walk(dfid, 1, &name, 1); | |
934 | if (IS_ERR(fid)) { | |
935 | err = PTR_ERR(fid); | |
936 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
937 | err); | |
938 | fid = NULL; | |
939 | goto error; | |
940 | } | |
941 | ||
942 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
943 | if (IS_ERR(inode)) { | |
944 | err = PTR_ERR(inode); | |
945 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
946 | err); | |
947 | goto error; | |
948 | } | |
949 | dentry->d_op = &v9fs_cached_dentry_operations; | |
950 | d_instantiate(dentry, inode); | |
951 | err = v9fs_fid_add(dentry, fid); | |
952 | if (err < 0) | |
953 | goto error; | |
954 | fid = NULL; | |
ad77dbce AK |
955 | } else { |
956 | /* | |
957 | * Not in cached mode. No need to populate | |
958 | * inode with stat. We need to get an inode | |
959 | * so that we can set the acl with dentry | |
960 | */ | |
961 | inode = v9fs_get_inode(dir->i_sb, mode); | |
962 | if (IS_ERR(inode)) { | |
963 | err = PTR_ERR(inode); | |
964 | goto error; | |
965 | } | |
966 | dentry->d_op = &v9fs_dentry_operations; | |
967 | d_instantiate(dentry, inode); | |
01a622bd | 968 | } |
ad77dbce AK |
969 | /* Now set the ACL based on the default value */ |
970 | v9fs_set_create_acl(dentry, dacl, pacl); | |
971 | ||
01a622bd MK |
972 | error: |
973 | if (fid) | |
974 | p9_client_clunk(fid); | |
975 | return err; | |
976 | } | |
977 | ||
2bad8471 EVH |
978 | /** |
979 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
980 | * @dir: inode that is being walked from | |
981 | * @dentry: dentry that is being walked to? | |
982 | * @nameidata: path data | |
983 | * | |
984 | */ | |
985 | ||
986 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
987 | struct nameidata *nameidata) | |
988 | { | |
989 | struct super_block *sb; | |
990 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 991 | struct p9_fid *dfid, *fid; |
2bad8471 | 992 | struct inode *inode; |
bd238fb4 | 993 | char *name; |
2bad8471 EVH |
994 | int result = 0; |
995 | ||
bd238fb4 | 996 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 997 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 998 | |
11e9b49b SK |
999 | if (dentry->d_name.len > NAME_MAX) |
1000 | return ERR_PTR(-ENAMETOOLONG); | |
1001 | ||
2bad8471 EVH |
1002 | sb = dir->i_sb; |
1003 | v9ses = v9fs_inode2v9ses(dir); | |
a534c8d1 | 1004 | /* We can walk d_parent because we hold the dir->i_mutex */ |
bd238fb4 LI |
1005 | dfid = v9fs_fid_lookup(dentry->d_parent); |
1006 | if (IS_ERR(dfid)) | |
e231c2ee | 1007 | return ERR_CAST(dfid); |
bd238fb4 LI |
1008 | |
1009 | name = (char *) dentry->d_name.name; | |
1010 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1011 | if (IS_ERR(fid)) { | |
1012 | result = PTR_ERR(fid); | |
2bad8471 | 1013 | if (result == -ENOENT) { |
85e0df24 AK |
1014 | inode = NULL; |
1015 | goto inst_out; | |
2bad8471 | 1016 | } |
2bad8471 | 1017 | |
bd238fb4 | 1018 | return ERR_PTR(result); |
2bad8471 EVH |
1019 | } |
1020 | ||
bd238fb4 LI |
1021 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
1022 | if (IS_ERR(inode)) { | |
1023 | result = PTR_ERR(inode); | |
1024 | inode = NULL; | |
1025 | goto error; | |
2bad8471 EVH |
1026 | } |
1027 | ||
bd238fb4 | 1028 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 1029 | if (result < 0) |
bd238fb4 | 1030 | goto error; |
6a3124a3 | 1031 | |
85e0df24 AK |
1032 | inst_out: |
1033 | if (v9ses->cache) | |
e03abc0c EVH |
1034 | dentry->d_op = &v9fs_cached_dentry_operations; |
1035 | else | |
1036 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
1037 | |
1038 | d_add(dentry, inode); | |
2bad8471 EVH |
1039 | return NULL; |
1040 | ||
bd238fb4 | 1041 | error: |
62aa528e | 1042 | p9_client_clunk(fid); |
da977b2c | 1043 | |
2bad8471 EVH |
1044 | return ERR_PTR(result); |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
1049 | * @i: inode that is being unlinked | |
73c592b9 | 1050 | * @d: dentry that is being unlinked |
2bad8471 EVH |
1051 | * |
1052 | */ | |
1053 | ||
1054 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
1055 | { | |
1056 | return v9fs_remove(i, d, 0); | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
1061 | * @i: inode that is being unlinked | |
73c592b9 | 1062 | * @d: dentry that is being unlinked |
2bad8471 EVH |
1063 | * |
1064 | */ | |
1065 | ||
1066 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
1067 | { | |
1068 | return v9fs_remove(i, d, 1); | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * v9fs_vfs_rename - VFS hook to rename an inode | |
1073 | * @old_dir: old dir inode | |
1074 | * @old_dentry: old dentry | |
1075 | * @new_dir: new dir inode | |
1076 | * @new_dentry: new dentry | |
1077 | * | |
1078 | */ | |
1079 | ||
1080 | static int | |
1081 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1082 | struct inode *new_dir, struct dentry *new_dentry) | |
1083 | { | |
bd238fb4 LI |
1084 | struct inode *old_inode; |
1085 | struct v9fs_session_info *v9ses; | |
1086 | struct p9_fid *oldfid; | |
1087 | struct p9_fid *olddirfid; | |
1088 | struct p9_fid *newdirfid; | |
1089 | struct p9_wstat wstat; | |
1090 | int retval; | |
2bad8471 | 1091 | |
bd238fb4 LI |
1092 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
1093 | retval = 0; | |
1094 | old_inode = old_dentry->d_inode; | |
1095 | v9ses = v9fs_inode2v9ses(old_inode); | |
1096 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 1097 | if (IS_ERR(oldfid)) |
da977b2c EVH |
1098 | return PTR_ERR(oldfid); |
1099 | ||
1100 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 1101 | if (IS_ERR(olddirfid)) { |
da977b2c | 1102 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 1103 | goto done; |
da977b2c EVH |
1104 | } |
1105 | ||
1106 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 1107 | if (IS_ERR(newdirfid)) { |
da977b2c | 1108 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 1109 | goto clunk_olddir; |
2bad8471 EVH |
1110 | } |
1111 | ||
a534c8d1 | 1112 | down_write(&v9ses->rename_sem); |
4681dbda SK |
1113 | if (v9fs_proto_dotl(v9ses)) { |
1114 | retval = p9_client_rename(oldfid, newdirfid, | |
1115 | (char *) new_dentry->d_name.name); | |
1116 | if (retval != -ENOSYS) | |
1117 | goto clunk_newdir; | |
1118 | } | |
a534c8d1 AK |
1119 | if (old_dentry->d_parent != new_dentry->d_parent) { |
1120 | /* | |
1121 | * 9P .u can only handle file rename in the same directory | |
1122 | */ | |
4681dbda | 1123 | |
bd238fb4 LI |
1124 | P9_DPRINTK(P9_DEBUG_ERROR, |
1125 | "old dir and new dir are different\n"); | |
621997cd | 1126 | retval = -EXDEV; |
bd238fb4 | 1127 | goto clunk_newdir; |
2bad8471 | 1128 | } |
531b1094 | 1129 | v9fs_blank_wstat(&wstat); |
ba17674f | 1130 | wstat.muid = v9ses->uname; |
531b1094 | 1131 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 1132 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 1133 | |
bd238fb4 | 1134 | clunk_newdir: |
a534c8d1 AK |
1135 | if (!retval) |
1136 | /* successful rename */ | |
1137 | d_move(old_dentry, new_dentry); | |
1138 | up_write(&v9ses->rename_sem); | |
22150c4f | 1139 | p9_client_clunk(newdirfid); |
2bad8471 | 1140 | |
bd238fb4 | 1141 | clunk_olddir: |
22150c4f | 1142 | p9_client_clunk(olddirfid); |
da977b2c | 1143 | |
bd238fb4 | 1144 | done: |
2bad8471 EVH |
1145 | return retval; |
1146 | } | |
1147 | ||
1148 | /** | |
943ffb58 | 1149 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
1150 | * @mnt: mount information |
1151 | * @dentry: file to get attributes on | |
1152 | * @stat: metadata structure to populate | |
2bad8471 EVH |
1153 | * |
1154 | */ | |
1155 | ||
1156 | static int | |
1157 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1158 | struct kstat *stat) | |
1159 | { | |
bd238fb4 LI |
1160 | int err; |
1161 | struct v9fs_session_info *v9ses; | |
1162 | struct p9_fid *fid; | |
51a87c55 | 1163 | struct p9_wstat *st; |
bd238fb4 LI |
1164 | |
1165 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
1166 | err = -EPERM; | |
1167 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 1168 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
1169 | return simple_getattr(mnt, dentry, stat); |
1170 | ||
bd238fb4 LI |
1171 | fid = v9fs_fid_lookup(dentry); |
1172 | if (IS_ERR(fid)) | |
da977b2c | 1173 | return PTR_ERR(fid); |
2bad8471 | 1174 | |
bd238fb4 LI |
1175 | st = p9_client_stat(fid); |
1176 | if (IS_ERR(st)) | |
1177 | return PTR_ERR(st); | |
2bad8471 | 1178 | |
bd238fb4 | 1179 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 1180 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 1181 | |
62b2be59 | 1182 | p9stat_free(st); |
bd238fb4 LI |
1183 | kfree(st); |
1184 | return 0; | |
2bad8471 EVH |
1185 | } |
1186 | ||
f0853122 SK |
1187 | static int |
1188 | v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, | |
1189 | struct kstat *stat) | |
1190 | { | |
1191 | int err; | |
1192 | struct v9fs_session_info *v9ses; | |
1193 | struct p9_fid *fid; | |
1194 | struct p9_stat_dotl *st; | |
1195 | ||
1196 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
1197 | err = -EPERM; | |
1198 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1199 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) | |
1200 | return simple_getattr(mnt, dentry, stat); | |
1201 | ||
1202 | fid = v9fs_fid_lookup(dentry); | |
1203 | if (IS_ERR(fid)) | |
1204 | return PTR_ERR(fid); | |
1205 | ||
1206 | /* Ask for all the fields in stat structure. Server will return | |
1207 | * whatever it supports | |
1208 | */ | |
1209 | ||
1210 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); | |
1211 | if (IS_ERR(st)) | |
1212 | return PTR_ERR(st); | |
1213 | ||
1214 | v9fs_stat2inode_dotl(st, dentry->d_inode); | |
1215 | generic_fillattr(dentry->d_inode, stat); | |
1216 | /* Change block size to what the server returned */ | |
1217 | stat->blksize = st->st_blksize; | |
1218 | ||
1219 | kfree(st); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
2bad8471 EVH |
1223 | /** |
1224 | * v9fs_vfs_setattr - set file metadata | |
1225 | * @dentry: file whose metadata to set | |
1226 | * @iattr: metadata assignment structure | |
1227 | * | |
1228 | */ | |
1229 | ||
1230 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
1231 | { | |
bd238fb4 LI |
1232 | int retval; |
1233 | struct v9fs_session_info *v9ses; | |
1234 | struct p9_fid *fid; | |
1235 | struct p9_wstat wstat; | |
2bad8471 | 1236 | |
bd238fb4 LI |
1237 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
1238 | retval = -EPERM; | |
1239 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1240 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
1241 | if(IS_ERR(fid)) |
1242 | return PTR_ERR(fid); | |
2bad8471 | 1243 | |
531b1094 | 1244 | v9fs_blank_wstat(&wstat); |
2bad8471 | 1245 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 1246 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
1247 | |
1248 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 1249 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
1250 | |
1251 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 1252 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
1253 | |
1254 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 1255 | wstat.length = iattr->ia_size; |
2bad8471 | 1256 | |
dd6102fb | 1257 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1258 | if (iattr->ia_valid & ATTR_UID) |
1259 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 1260 | |
531b1094 LI |
1261 | if (iattr->ia_valid & ATTR_GID) |
1262 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
1263 | } |
1264 | ||
bd238fb4 | 1265 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
1266 | if (retval < 0) |
1267 | return retval; | |
2bad8471 | 1268 | |
1025774c CH |
1269 | if ((iattr->ia_valid & ATTR_SIZE) && |
1270 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
1271 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
1272 | if (retval) | |
1273 | return retval; | |
1274 | } | |
2bad8471 | 1275 | |
1025774c CH |
1276 | setattr_copy(dentry->d_inode, iattr); |
1277 | mark_inode_dirty(dentry->d_inode); | |
1278 | return 0; | |
2bad8471 EVH |
1279 | } |
1280 | ||
87d7845a SK |
1281 | /** |
1282 | * v9fs_vfs_setattr_dotl - set file metadata | |
1283 | * @dentry: file whose metadata to set | |
1284 | * @iattr: metadata assignment structure | |
1285 | * | |
1286 | */ | |
1287 | ||
22d8dcdf | 1288 | int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) |
87d7845a SK |
1289 | { |
1290 | int retval; | |
1291 | struct v9fs_session_info *v9ses; | |
1292 | struct p9_fid *fid; | |
1293 | struct p9_iattr_dotl p9attr; | |
1294 | ||
1295 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); | |
1296 | ||
1297 | retval = inode_change_ok(dentry->d_inode, iattr); | |
1298 | if (retval) | |
1299 | return retval; | |
1300 | ||
1301 | p9attr.valid = iattr->ia_valid; | |
1302 | p9attr.mode = iattr->ia_mode; | |
1303 | p9attr.uid = iattr->ia_uid; | |
1304 | p9attr.gid = iattr->ia_gid; | |
1305 | p9attr.size = iattr->ia_size; | |
1306 | p9attr.atime_sec = iattr->ia_atime.tv_sec; | |
1307 | p9attr.atime_nsec = iattr->ia_atime.tv_nsec; | |
1308 | p9attr.mtime_sec = iattr->ia_mtime.tv_sec; | |
1309 | p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; | |
1310 | ||
1311 | retval = -EPERM; | |
1312 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1313 | fid = v9fs_fid_lookup(dentry); | |
1314 | if (IS_ERR(fid)) | |
1315 | return PTR_ERR(fid); | |
1316 | ||
1317 | retval = p9_client_setattr(fid, &p9attr); | |
8cef9c67 SR |
1318 | if (retval < 0) |
1319 | return retval; | |
87d7845a | 1320 | |
8cef9c67 SR |
1321 | if ((iattr->ia_valid & ATTR_SIZE) && |
1322 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
1323 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
1324 | if (retval) | |
1325 | return retval; | |
1326 | } | |
1327 | ||
1328 | setattr_copy(dentry->d_inode, iattr); | |
1329 | mark_inode_dirty(dentry->d_inode); | |
6e8dc555 AK |
1330 | if (iattr->ia_valid & ATTR_MODE) { |
1331 | /* We also want to update ACL when we update mode bits */ | |
1332 | retval = v9fs_acl_chmod(dentry); | |
1333 | if (retval < 0) | |
1334 | return retval; | |
1335 | } | |
8cef9c67 | 1336 | return 0; |
87d7845a SK |
1337 | } |
1338 | ||
2bad8471 | 1339 | /** |
531b1094 LI |
1340 | * v9fs_stat2inode - populate an inode structure with mistat info |
1341 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
1342 | * @inode: inode to populate |
1343 | * @sb: superblock of filesystem | |
1344 | * | |
1345 | */ | |
1346 | ||
1347 | void | |
51a87c55 | 1348 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 1349 | struct super_block *sb) |
2bad8471 | 1350 | { |
531b1094 | 1351 | char ext[32]; |
5717144a AK |
1352 | char tag_name[14]; |
1353 | unsigned int i_nlink; | |
2bad8471 EVH |
1354 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
1355 | ||
1356 | inode->i_nlink = 1; | |
1357 | ||
531b1094 LI |
1358 | inode->i_atime.tv_sec = stat->atime; |
1359 | inode->i_mtime.tv_sec = stat->mtime; | |
1360 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 1361 | |
bd32b82d LI |
1362 | inode->i_uid = v9ses->dfltuid; |
1363 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 1364 | |
dd6102fb | 1365 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1366 | inode->i_uid = stat->n_uid; |
1367 | inode->i_gid = stat->n_gid; | |
2bad8471 | 1368 | } |
5717144a AK |
1369 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
1370 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
1371 | /* | |
1372 | * Hadlink support got added later to | |
1373 | * to the .u extension. So there can be | |
1374 | * server out there that doesn't support | |
1375 | * this even with .u extension. So check | |
1376 | * for non NULL stat->extension | |
1377 | */ | |
1378 | strncpy(ext, stat->extension, sizeof(ext)); | |
1379 | /* HARDLINKCOUNT %u */ | |
1380 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
1381 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
1382 | inode->i_nlink = i_nlink; | |
1383 | } | |
1384 | } | |
531b1094 | 1385 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
1386 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
1387 | char type = 0; | |
1388 | int major = -1; | |
1389 | int minor = -1; | |
531b1094 | 1390 | |
51a87c55 | 1391 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 1392 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
1393 | switch (type) { |
1394 | case 'c': | |
1395 | inode->i_mode &= ~S_IFBLK; | |
1396 | inode->i_mode |= S_IFCHR; | |
1397 | break; | |
1398 | case 'b': | |
1399 | break; | |
1400 | default: | |
bd238fb4 | 1401 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
1402 | "Unknown special type %c %s\n", type, |
1403 | stat->extension); | |
2bad8471 EVH |
1404 | }; |
1405 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 1406 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
1407 | } else |
1408 | inode->i_rdev = 0; | |
1409 | ||
7549ae3e | 1410 | i_size_write(inode, stat->length); |
2bad8471 | 1411 | |
bd238fb4 | 1412 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 1413 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
1414 | } |
1415 | ||
f0853122 SK |
1416 | /** |
1417 | * v9fs_stat2inode_dotl - populate an inode structure with stat info | |
1418 | * @stat: stat structure | |
1419 | * @inode: inode to populate | |
1420 | * @sb: superblock of filesystem | |
1421 | * | |
1422 | */ | |
1423 | ||
1424 | void | |
1425 | v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) | |
1426 | { | |
1427 | ||
1428 | if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { | |
1429 | inode->i_atime.tv_sec = stat->st_atime_sec; | |
1430 | inode->i_atime.tv_nsec = stat->st_atime_nsec; | |
1431 | inode->i_mtime.tv_sec = stat->st_mtime_sec; | |
1432 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; | |
1433 | inode->i_ctime.tv_sec = stat->st_ctime_sec; | |
1434 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; | |
1435 | inode->i_uid = stat->st_uid; | |
1436 | inode->i_gid = stat->st_gid; | |
1437 | inode->i_nlink = stat->st_nlink; | |
1438 | inode->i_mode = stat->st_mode; | |
1439 | inode->i_rdev = new_decode_dev(stat->st_rdev); | |
1440 | ||
1441 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) | |
1442 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1443 | ||
1444 | i_size_write(inode, stat->st_size); | |
1445 | inode->i_blocks = stat->st_blocks; | |
1446 | } else { | |
1447 | if (stat->st_result_mask & P9_STATS_ATIME) { | |
1448 | inode->i_atime.tv_sec = stat->st_atime_sec; | |
1449 | inode->i_atime.tv_nsec = stat->st_atime_nsec; | |
1450 | } | |
1451 | if (stat->st_result_mask & P9_STATS_MTIME) { | |
1452 | inode->i_mtime.tv_sec = stat->st_mtime_sec; | |
1453 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; | |
1454 | } | |
1455 | if (stat->st_result_mask & P9_STATS_CTIME) { | |
1456 | inode->i_ctime.tv_sec = stat->st_ctime_sec; | |
1457 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; | |
1458 | } | |
1459 | if (stat->st_result_mask & P9_STATS_UID) | |
1460 | inode->i_uid = stat->st_uid; | |
1461 | if (stat->st_result_mask & P9_STATS_GID) | |
1462 | inode->i_gid = stat->st_gid; | |
1463 | if (stat->st_result_mask & P9_STATS_NLINK) | |
1464 | inode->i_nlink = stat->st_nlink; | |
1465 | if (stat->st_result_mask & P9_STATS_MODE) { | |
1466 | inode->i_mode = stat->st_mode; | |
1467 | if ((S_ISBLK(inode->i_mode)) || | |
1468 | (S_ISCHR(inode->i_mode))) | |
1469 | init_special_inode(inode, inode->i_mode, | |
1470 | inode->i_rdev); | |
1471 | } | |
1472 | if (stat->st_result_mask & P9_STATS_RDEV) | |
1473 | inode->i_rdev = new_decode_dev(stat->st_rdev); | |
1474 | if (stat->st_result_mask & P9_STATS_SIZE) | |
1475 | i_size_write(inode, stat->st_size); | |
1476 | if (stat->st_result_mask & P9_STATS_BLOCKS) | |
1477 | inode->i_blocks = stat->st_blocks; | |
1478 | } | |
1479 | if (stat->st_result_mask & P9_STATS_GEN) | |
1480 | inode->i_generation = stat->st_gen; | |
1481 | ||
1482 | /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION | |
1483 | * because the inode structure does not have fields for them. | |
1484 | */ | |
1485 | } | |
1486 | ||
2bad8471 EVH |
1487 | /** |
1488 | * v9fs_qid2ino - convert qid into inode number | |
1489 | * @qid: qid to hash | |
1490 | * | |
1491 | * BUG: potential for inode number collisions? | |
1492 | */ | |
1493 | ||
bd238fb4 | 1494 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
1495 | { |
1496 | u64 path = qid->path + 2; | |
1497 | ino_t i = 0; | |
1498 | ||
1499 | if (sizeof(ino_t) == sizeof(path)) | |
1500 | memcpy(&i, &path, sizeof(ino_t)); | |
1501 | else | |
1502 | i = (ino_t) (path ^ (path >> 32)); | |
1503 | ||
1504 | return i; | |
1505 | } | |
1506 | ||
2bad8471 EVH |
1507 | /** |
1508 | * v9fs_readlink - read a symlink's location (internal version) | |
1509 | * @dentry: dentry for symlink | |
73c592b9 | 1510 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1511 | * @buflen: length of buffer |
1512 | * | |
1513 | */ | |
1514 | ||
1515 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1516 | { | |
bd238fb4 | 1517 | int retval; |
2bad8471 | 1518 | |
bd238fb4 LI |
1519 | struct v9fs_session_info *v9ses; |
1520 | struct p9_fid *fid; | |
51a87c55 | 1521 | struct p9_wstat *st; |
2bad8471 | 1522 | |
bd238fb4 LI |
1523 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1524 | retval = -EPERM; | |
1525 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1526 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1527 | if (IS_ERR(fid)) |
da977b2c | 1528 | return PTR_ERR(fid); |
2bad8471 | 1529 | |
329176cc | 1530 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1531 | return -EBADF; |
2bad8471 | 1532 | |
bd238fb4 LI |
1533 | st = p9_client_stat(fid); |
1534 | if (IS_ERR(st)) | |
1535 | return PTR_ERR(st); | |
2bad8471 | 1536 | |
bd238fb4 | 1537 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1538 | retval = -EINVAL; |
bd238fb4 | 1539 | goto done; |
2bad8471 EVH |
1540 | } |
1541 | ||
1542 | /* copy extension buffer into buffer */ | |
51a87c55 | 1543 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1544 | |
bd238fb4 | 1545 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1546 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1547 | |
2511cd0b | 1548 | retval = strnlen(buffer, buflen); |
bd238fb4 | 1549 | done: |
62b2be59 | 1550 | p9stat_free(st); |
bd238fb4 | 1551 | kfree(st); |
2bad8471 EVH |
1552 | return retval; |
1553 | } | |
1554 | ||
2bad8471 EVH |
1555 | /** |
1556 | * v9fs_vfs_follow_link - follow a symlink path | |
1557 | * @dentry: dentry for symlink | |
1558 | * @nd: nameidata | |
1559 | * | |
1560 | */ | |
1561 | ||
1562 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1563 | { | |
1564 | int len = 0; | |
1565 | char *link = __getname(); | |
1566 | ||
bd238fb4 | 1567 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1568 | |
1569 | if (!link) | |
1570 | link = ERR_PTR(-ENOMEM); | |
1571 | else { | |
16cce6d2 | 1572 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1573 | |
1574 | if (len < 0) { | |
ce44eeb6 | 1575 | __putname(link); |
2bad8471 EVH |
1576 | link = ERR_PTR(len); |
1577 | } else | |
2511cd0b | 1578 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1579 | } |
1580 | nd_set_link(nd, link); | |
1581 | ||
1582 | return NULL; | |
1583 | } | |
1584 | ||
1585 | /** | |
1586 | * v9fs_vfs_put_link - release a symlink path | |
1587 | * @dentry: dentry for symlink | |
1588 | * @nd: nameidata | |
ee443996 | 1589 | * @p: unused |
2bad8471 EVH |
1590 | * |
1591 | */ | |
1592 | ||
ee443996 EVH |
1593 | static void |
1594 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1595 | { |
1596 | char *s = nd_get_link(nd); | |
1597 | ||
6ff23207 DG |
1598 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1599 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1600 | if (!IS_ERR(s)) |
ce44eeb6 | 1601 | __putname(s); |
2bad8471 EVH |
1602 | } |
1603 | ||
ee443996 EVH |
1604 | /** |
1605 | * v9fs_vfs_mkspecial - create a special file | |
1606 | * @dir: inode to create special file in | |
1607 | * @dentry: dentry to create | |
1608 | * @mode: mode to create special file | |
1609 | * @extension: 9p2000.u format extension string representing special file | |
1610 | * | |
1611 | */ | |
1612 | ||
531b1094 LI |
1613 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1614 | int mode, const char *extension) | |
2bad8471 | 1615 | { |
bd238fb4 | 1616 | u32 perm; |
531b1094 | 1617 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1618 | struct p9_fid *fid; |
2bad8471 | 1619 | |
6a3124a3 | 1620 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1621 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1622 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1623 | return -EPERM; |
2bad8471 EVH |
1624 | } |
1625 | ||
da977b2c | 1626 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1627 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1628 | P9_OREAD); | |
1629 | if (IS_ERR(fid)) | |
1630 | return PTR_ERR(fid); | |
da977b2c | 1631 | |
bd238fb4 | 1632 | p9_client_clunk(fid); |
6a3124a3 | 1633 | return 0; |
531b1094 LI |
1634 | } |
1635 | ||
50cc42ff VJJ |
1636 | /** |
1637 | * v9fs_vfs_symlink_dotl - helper function to create symlinks | |
1638 | * @dir: directory inode containing symlink | |
1639 | * @dentry: dentry for symlink | |
1640 | * @symname: symlink data | |
1641 | * | |
1642 | * See Also: 9P2000.L RFC for more information | |
1643 | * | |
1644 | */ | |
1645 | ||
1646 | static int | |
1647 | v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, | |
1648 | const char *symname) | |
1649 | { | |
1650 | struct v9fs_session_info *v9ses; | |
1651 | struct p9_fid *dfid; | |
1652 | struct p9_fid *fid = NULL; | |
1653 | struct inode *inode; | |
1654 | struct p9_qid qid; | |
1655 | char *name; | |
1656 | int err; | |
1657 | gid_t gid; | |
1658 | ||
1659 | name = (char *) dentry->d_name.name; | |
1660 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n", | |
1661 | dir->i_ino, name, symname); | |
1662 | v9ses = v9fs_inode2v9ses(dir); | |
1663 | ||
1664 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
1665 | if (IS_ERR(dfid)) { | |
1666 | err = PTR_ERR(dfid); | |
1667 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
1668 | return err; | |
1669 | } | |
1670 | ||
1671 | gid = v9fs_get_fsgid_for_create(dir); | |
1672 | ||
50cc42ff VJJ |
1673 | /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
1674 | err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); | |
1675 | ||
1676 | if (err < 0) { | |
1677 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); | |
1678 | goto error; | |
1679 | } | |
1680 | ||
1681 | if (v9ses->cache) { | |
1682 | /* Now walk from the parent so we can get an unopened fid. */ | |
1683 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1684 | if (IS_ERR(fid)) { | |
1685 | err = PTR_ERR(fid); | |
1686 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
1687 | err); | |
1688 | fid = NULL; | |
1689 | goto error; | |
1690 | } | |
1691 | ||
1692 | /* instantiate inode and assign the unopened fid to dentry */ | |
1693 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
1694 | if (IS_ERR(inode)) { | |
1695 | err = PTR_ERR(inode); | |
1696 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
1697 | err); | |
1698 | goto error; | |
1699 | } | |
1700 | dentry->d_op = &v9fs_cached_dentry_operations; | |
1701 | d_instantiate(dentry, inode); | |
1702 | err = v9fs_fid_add(dentry, fid); | |
1703 | if (err < 0) | |
1704 | goto error; | |
1705 | fid = NULL; | |
1706 | } else { | |
1707 | /* Not in cached mode. No need to populate inode with stat */ | |
1708 | inode = v9fs_get_inode(dir->i_sb, S_IFLNK); | |
1709 | if (IS_ERR(inode)) { | |
1710 | err = PTR_ERR(inode); | |
1711 | goto error; | |
1712 | } | |
1713 | dentry->d_op = &v9fs_dentry_operations; | |
1714 | d_instantiate(dentry, inode); | |
1715 | } | |
1716 | ||
1717 | error: | |
1718 | if (fid) | |
1719 | p9_client_clunk(fid); | |
1720 | ||
1721 | return err; | |
1722 | } | |
1723 | ||
531b1094 LI |
1724 | /** |
1725 | * v9fs_vfs_symlink - helper function to create symlinks | |
1726 | * @dir: directory inode containing symlink | |
1727 | * @dentry: dentry for symlink | |
1728 | * @symname: symlink data | |
1729 | * | |
ee443996 | 1730 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1731 | * |
1732 | */ | |
1733 | ||
1734 | static int | |
1735 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1736 | { | |
bd238fb4 LI |
1737 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1738 | dentry->d_name.name, symname); | |
531b1094 LI |
1739 | |
1740 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1741 | } | |
1742 | ||
1743 | /** | |
1744 | * v9fs_vfs_link - create a hardlink | |
1745 | * @old_dentry: dentry for file to link to | |
1746 | * @dir: inode destination for new link | |
1747 | * @dentry: dentry for link | |
1748 | * | |
1749 | */ | |
1750 | ||
531b1094 LI |
1751 | static int |
1752 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1753 | struct dentry *dentry) | |
1754 | { | |
1755 | int retval; | |
bd238fb4 | 1756 | struct p9_fid *oldfid; |
531b1094 LI |
1757 | char *name; |
1758 | ||
bd238fb4 LI |
1759 | P9_DPRINTK(P9_DEBUG_VFS, |
1760 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1761 | old_dentry->d_name.name); |
1762 | ||
da977b2c | 1763 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1764 | if (IS_ERR(oldfid)) |
da977b2c | 1765 | return PTR_ERR(oldfid); |
531b1094 LI |
1766 | |
1767 | name = __getname(); | |
da977b2c EVH |
1768 | if (unlikely(!name)) { |
1769 | retval = -ENOMEM; | |
1770 | goto clunk_fid; | |
1771 | } | |
0710d36a | 1772 | |
16cce6d2 | 1773 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1774 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1775 | __putname(name); |
2bad8471 | 1776 | |
da977b2c | 1777 | clunk_fid: |
bd238fb4 | 1778 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1779 | return retval; |
1780 | } | |
1781 | ||
09d34ee5 EVH |
1782 | /** |
1783 | * v9fs_vfs_link_dotl - create a hardlink for dotl | |
1784 | * @old_dentry: dentry for file to link to | |
1785 | * @dir: inode destination for new link | |
1786 | * @dentry: dentry for link | |
1787 | * | |
1788 | */ | |
1789 | ||
1790 | static int | |
1791 | v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, | |
1792 | struct dentry *dentry) | |
1793 | { | |
1794 | int err; | |
1795 | struct p9_fid *dfid, *oldfid; | |
1796 | char *name; | |
1797 | struct v9fs_session_info *v9ses; | |
1798 | struct dentry *dir_dentry; | |
1799 | ||
1800 | P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", | |
1801 | dir->i_ino, old_dentry->d_name.name, | |
1802 | dentry->d_name.name); | |
1803 | ||
1804 | v9ses = v9fs_inode2v9ses(dir); | |
1805 | dir_dentry = v9fs_dentry_from_dir_inode(dir); | |
1806 | dfid = v9fs_fid_lookup(dir_dentry); | |
1807 | if (IS_ERR(dfid)) | |
1808 | return PTR_ERR(dfid); | |
1809 | ||
1810 | oldfid = v9fs_fid_lookup(old_dentry); | |
1811 | if (IS_ERR(oldfid)) | |
1812 | return PTR_ERR(oldfid); | |
1813 | ||
1814 | name = (char *) dentry->d_name.name; | |
1815 | ||
1816 | err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); | |
1817 | ||
1818 | if (err < 0) { | |
1819 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); | |
1820 | return err; | |
1821 | } | |
1822 | ||
1823 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
1824 | /* Get the latest stat info from server. */ | |
1825 | struct p9_fid *fid; | |
1826 | struct p9_stat_dotl *st; | |
1827 | ||
1828 | fid = v9fs_fid_lookup(old_dentry); | |
1829 | if (IS_ERR(fid)) | |
1830 | return PTR_ERR(fid); | |
1831 | ||
1832 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
1833 | if (IS_ERR(st)) | |
1834 | return PTR_ERR(st); | |
1835 | ||
1836 | v9fs_stat2inode_dotl(st, old_dentry->d_inode); | |
1837 | ||
1838 | kfree(st); | |
1839 | } else { | |
1840 | /* Caching disabled. No need to get upto date stat info. | |
7de9c6ee AV |
1841 | * This dentry will be released immediately. So, just hold the |
1842 | * inode | |
09d34ee5 | 1843 | */ |
7de9c6ee | 1844 | ihold(old_dentry->d_inode); |
09d34ee5 EVH |
1845 | } |
1846 | ||
1847 | dentry->d_op = old_dentry->d_op; | |
1848 | d_instantiate(dentry, old_dentry->d_inode); | |
1849 | ||
1850 | return err; | |
1851 | } | |
1852 | ||
2bad8471 EVH |
1853 | /** |
1854 | * v9fs_vfs_mknod - create a special file | |
1855 | * @dir: inode destination for new link | |
1856 | * @dentry: dentry for file | |
1857 | * @mode: mode for creation | |
ee443996 | 1858 | * @rdev: device associated with special file |
2bad8471 EVH |
1859 | * |
1860 | */ | |
1861 | ||
1862 | static int | |
1863 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1864 | { | |
531b1094 LI |
1865 | int retval; |
1866 | char *name; | |
2bad8471 | 1867 | |
bd238fb4 LI |
1868 | P9_DPRINTK(P9_DEBUG_VFS, |
1869 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1870 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1871 | ||
531b1094 LI |
1872 | if (!new_valid_dev(rdev)) |
1873 | return -EINVAL; | |
2bad8471 | 1874 | |
531b1094 | 1875 | name = __getname(); |
c0291a05 ET |
1876 | if (!name) |
1877 | return -ENOMEM; | |
2bad8471 EVH |
1878 | /* build extension */ |
1879 | if (S_ISBLK(mode)) | |
531b1094 | 1880 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1881 | else if (S_ISCHR(mode)) |
531b1094 | 1882 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1883 | else if (S_ISFIFO(mode)) |
531b1094 | 1884 | *name = 0; |
75cc5c9b VJ |
1885 | else if (S_ISSOCK(mode)) |
1886 | *name = 0; | |
2bad8471 | 1887 | else { |
531b1094 LI |
1888 | __putname(name); |
1889 | return -EINVAL; | |
2bad8471 EVH |
1890 | } |
1891 | ||
531b1094 LI |
1892 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1893 | __putname(name); | |
2bad8471 EVH |
1894 | |
1895 | return retval; | |
1896 | } | |
1897 | ||
4b43516a MK |
1898 | /** |
1899 | * v9fs_vfs_mknod_dotl - create a special file | |
1900 | * @dir: inode destination for new link | |
1901 | * @dentry: dentry for file | |
1902 | * @mode: mode for creation | |
1903 | * @rdev: device associated with special file | |
1904 | * | |
1905 | */ | |
1906 | static int | |
ad77dbce | 1907 | v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, |
4b43516a MK |
1908 | dev_t rdev) |
1909 | { | |
1910 | int err; | |
1911 | char *name; | |
ad77dbce | 1912 | mode_t mode; |
4b43516a MK |
1913 | struct v9fs_session_info *v9ses; |
1914 | struct p9_fid *fid = NULL, *dfid = NULL; | |
1915 | struct inode *inode; | |
1916 | gid_t gid; | |
1917 | struct p9_qid qid; | |
01a622bd | 1918 | struct dentry *dir_dentry; |
ad77dbce | 1919 | struct posix_acl *dacl = NULL, *pacl = NULL; |
4b43516a MK |
1920 | |
1921 | P9_DPRINTK(P9_DEBUG_VFS, | |
1922 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
ad77dbce | 1923 | dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev)); |
4b43516a MK |
1924 | |
1925 | if (!new_valid_dev(rdev)) | |
1926 | return -EINVAL; | |
1927 | ||
1928 | v9ses = v9fs_inode2v9ses(dir); | |
1929 | dir_dentry = v9fs_dentry_from_dir_inode(dir); | |
01a622bd | 1930 | dfid = v9fs_fid_lookup(dir_dentry); |
4b43516a MK |
1931 | if (IS_ERR(dfid)) { |
1932 | err = PTR_ERR(dfid); | |
1933 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
1934 | dfid = NULL; | |
1935 | goto error; | |
1936 | } | |
1937 | ||
1938 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
1939 | mode = omode; |
1940 | /* Update mode based on ACL value */ | |
1941 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
1942 | if (err) { | |
1943 | P9_DPRINTK(P9_DEBUG_VFS, | |
1944 | "Failed to get acl values in mknod %d\n", err); | |
1945 | goto error; | |
1946 | } | |
4b43516a MK |
1947 | name = (char *) dentry->d_name.name; |
1948 | ||
1949 | err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); | |
1950 | if (err < 0) | |
1951 | goto error; | |
1952 | ||
1953 | /* instantiate inode and assign the unopened fid to the dentry */ | |
1954 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
1955 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1956 | if (IS_ERR(fid)) { | |
1957 | err = PTR_ERR(fid); | |
1958 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
1959 | err); | |
1960 | fid = NULL; | |
1961 | goto error; | |
1962 | } | |
1963 | ||
1964 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
1965 | if (IS_ERR(inode)) { | |
1966 | err = PTR_ERR(inode); | |
1967 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
1968 | err); | |
1969 | goto error; | |
1970 | } | |
1971 | dentry->d_op = &v9fs_cached_dentry_operations; | |
1972 | d_instantiate(dentry, inode); | |
1973 | err = v9fs_fid_add(dentry, fid); | |
1974 | if (err < 0) | |
1975 | goto error; | |
1976 | fid = NULL; | |
1977 | } else { | |
1978 | /* | |
1979 | * Not in cached mode. No need to populate inode with stat. | |
1980 | * socket syscall returns a fd, so we need instantiate | |
1981 | */ | |
1982 | inode = v9fs_get_inode(dir->i_sb, mode); | |
1983 | if (IS_ERR(inode)) { | |
1984 | err = PTR_ERR(inode); | |
1985 | goto error; | |
1986 | } | |
1987 | dentry->d_op = &v9fs_dentry_operations; | |
1988 | d_instantiate(dentry, inode); | |
1989 | } | |
ad77dbce AK |
1990 | /* Now set the ACL based on the default value */ |
1991 | v9fs_set_create_acl(dentry, dacl, pacl); | |
4b43516a MK |
1992 | error: |
1993 | if (fid) | |
1994 | p9_client_clunk(fid); | |
1995 | return err; | |
1996 | } | |
1997 | ||
329176cc MK |
1998 | static int |
1999 | v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen) | |
2000 | { | |
2001 | int retval; | |
2002 | struct p9_fid *fid; | |
2003 | char *target = NULL; | |
2004 | ||
2005 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); | |
2006 | retval = -EPERM; | |
2007 | fid = v9fs_fid_lookup(dentry); | |
2008 | if (IS_ERR(fid)) | |
2009 | return PTR_ERR(fid); | |
2010 | ||
2011 | retval = p9_client_readlink(fid, &target); | |
2012 | if (retval < 0) | |
2013 | return retval; | |
2014 | ||
2015 | strncpy(buffer, target, buflen); | |
2016 | P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer); | |
2017 | ||
2018 | retval = strnlen(buffer, buflen); | |
2019 | return retval; | |
2020 | } | |
2021 | ||
2022 | /** | |
2023 | * v9fs_vfs_follow_link_dotl - follow a symlink path | |
2024 | * @dentry: dentry for symlink | |
2025 | * @nd: nameidata | |
2026 | * | |
2027 | */ | |
2028 | ||
2029 | static void * | |
2030 | v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) | |
2031 | { | |
2032 | int len = 0; | |
2033 | char *link = __getname(); | |
2034 | ||
2035 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); | |
2036 | ||
2037 | if (!link) | |
2038 | link = ERR_PTR(-ENOMEM); | |
2039 | else { | |
2040 | len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX); | |
2041 | if (len < 0) { | |
2042 | __putname(link); | |
2043 | link = ERR_PTR(len); | |
2044 | } else | |
2045 | link[min(len, PATH_MAX-1)] = 0; | |
2046 | } | |
2047 | nd_set_link(nd, link); | |
2048 | ||
2049 | return NULL; | |
2050 | } | |
2051 | ||
9b6533c9 SK |
2052 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
2053 | .create = v9fs_vfs_create, | |
2054 | .lookup = v9fs_vfs_lookup, | |
2055 | .symlink = v9fs_vfs_symlink, | |
50cc42ff | 2056 | .link = v9fs_vfs_link, |
9b6533c9 SK |
2057 | .unlink = v9fs_vfs_unlink, |
2058 | .mkdir = v9fs_vfs_mkdir, | |
2059 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 2060 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
2061 | .rename = v9fs_vfs_rename, |
2062 | .getattr = v9fs_vfs_getattr, | |
2063 | .setattr = v9fs_vfs_setattr, | |
2064 | }; | |
2065 | ||
2066 | static const struct inode_operations v9fs_dir_inode_operations_dotl = { | |
5643135a | 2067 | .create = v9fs_vfs_create_dotl, |
2bad8471 | 2068 | .lookup = v9fs_vfs_lookup, |
50cc42ff VJJ |
2069 | .link = v9fs_vfs_link_dotl, |
2070 | .symlink = v9fs_vfs_symlink_dotl, | |
2bad8471 | 2071 | .unlink = v9fs_vfs_unlink, |
01a622bd | 2072 | .mkdir = v9fs_vfs_mkdir_dotl, |
2bad8471 | 2073 | .rmdir = v9fs_vfs_rmdir, |
4b43516a | 2074 | .mknod = v9fs_vfs_mknod_dotl, |
2bad8471 | 2075 | .rename = v9fs_vfs_rename, |
f0853122 | 2076 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2077 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2078 | .setxattr = generic_setxattr, |
2079 | .getxattr = generic_getxattr, | |
2080 | .removexattr = generic_removexattr, | |
2081 | .listxattr = v9fs_listxattr, | |
85ff872d | 2082 | .check_acl = v9fs_check_acl, |
2bad8471 EVH |
2083 | }; |
2084 | ||
754661f1 | 2085 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
2086 | .create = v9fs_vfs_create, |
2087 | .lookup = v9fs_vfs_lookup, | |
2088 | .unlink = v9fs_vfs_unlink, | |
2089 | .mkdir = v9fs_vfs_mkdir, | |
2090 | .rmdir = v9fs_vfs_rmdir, | |
2091 | .mknod = v9fs_vfs_mknod, | |
2092 | .rename = v9fs_vfs_rename, | |
2093 | .getattr = v9fs_vfs_getattr, | |
2094 | .setattr = v9fs_vfs_setattr, | |
2095 | }; | |
2096 | ||
754661f1 | 2097 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
2098 | .getattr = v9fs_vfs_getattr, |
2099 | .setattr = v9fs_vfs_setattr, | |
2100 | }; | |
2101 | ||
9b6533c9 | 2102 | static const struct inode_operations v9fs_file_inode_operations_dotl = { |
f0853122 | 2103 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2104 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2105 | .setxattr = generic_setxattr, |
2106 | .getxattr = generic_getxattr, | |
2107 | .removexattr = generic_removexattr, | |
2108 | .listxattr = v9fs_listxattr, | |
85ff872d | 2109 | .check_acl = v9fs_check_acl, |
9b6533c9 SK |
2110 | }; |
2111 | ||
754661f1 | 2112 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 2113 | .readlink = generic_readlink, |
2bad8471 EVH |
2114 | .follow_link = v9fs_vfs_follow_link, |
2115 | .put_link = v9fs_vfs_put_link, | |
2116 | .getattr = v9fs_vfs_getattr, | |
2117 | .setattr = v9fs_vfs_setattr, | |
2118 | }; | |
9b6533c9 SK |
2119 | |
2120 | static const struct inode_operations v9fs_symlink_inode_operations_dotl = { | |
329176cc MK |
2121 | .readlink = v9fs_vfs_readlink_dotl, |
2122 | .follow_link = v9fs_vfs_follow_link_dotl, | |
9b6533c9 | 2123 | .put_link = v9fs_vfs_put_link, |
f0853122 | 2124 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2125 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2126 | .setxattr = generic_setxattr, |
2127 | .getxattr = generic_getxattr, | |
2128 | .removexattr = generic_removexattr, | |
2129 | .listxattr = v9fs_listxattr, | |
9b6533c9 | 2130 | }; |