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 | 51 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
754661f1 AV |
52 | static const struct inode_operations v9fs_file_inode_operations; |
53 | static const struct inode_operations v9fs_symlink_inode_operations; | |
f5fc6145 | 54 | |
2bad8471 EVH |
55 | /** |
56 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
57 | * @v9ses: v9fs session information | |
58 | * @mode: mode to convert | |
59 | * | |
60 | */ | |
61 | ||
73c592b9 | 62 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
63 | { |
64 | int res; | |
65 | res = mode & 0777; | |
66 | if (S_ISDIR(mode)) | |
bd238fb4 | 67 | res |= P9_DMDIR; |
dd6102fb | 68 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 69 | if (S_ISLNK(mode)) |
bd238fb4 | 70 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
71 | if (v9ses->nodev == 0) { |
72 | if (S_ISSOCK(mode)) | |
bd238fb4 | 73 | res |= P9_DMSOCKET; |
2bad8471 | 74 | if (S_ISFIFO(mode)) |
bd238fb4 | 75 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 76 | if (S_ISBLK(mode)) |
bd238fb4 | 77 | res |= P9_DMDEVICE; |
2bad8471 | 78 | if (S_ISCHR(mode)) |
bd238fb4 | 79 | res |= P9_DMDEVICE; |
2bad8471 EVH |
80 | } |
81 | ||
82 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 83 | res |= P9_DMSETUID; |
2bad8471 | 84 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 85 | res |= P9_DMSETGID; |
d199d652 AL |
86 | if ((mode & S_ISVTX) == S_ISVTX) |
87 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
88 | if ((mode & P9_DMLINK)) |
89 | res |= P9_DMLINK; | |
2bad8471 EVH |
90 | } |
91 | ||
92 | return res; | |
93 | } | |
94 | ||
95 | /** | |
96 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
97 | * @v9ses: v9fs session information | |
98 | * @mode: mode to convert | |
99 | * | |
100 | */ | |
101 | ||
73c592b9 | 102 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
103 | { |
104 | int res; | |
105 | ||
106 | res = mode & 0777; | |
107 | ||
bd238fb4 | 108 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 109 | res |= S_IFDIR; |
dd6102fb | 110 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 111 | res |= S_IFLNK; |
dd6102fb | 112 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
113 | && (v9ses->nodev == 0)) |
114 | res |= S_IFSOCK; | |
dd6102fb | 115 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
116 | && (v9ses->nodev == 0)) |
117 | res |= S_IFIFO; | |
dd6102fb | 118 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
119 | && (v9ses->nodev == 0)) |
120 | res |= S_IFBLK; | |
121 | else | |
122 | res |= S_IFREG; | |
123 | ||
dd6102fb | 124 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 125 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
126 | res |= S_ISUID; |
127 | ||
bd238fb4 | 128 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 129 | res |= S_ISGID; |
d199d652 AL |
130 | |
131 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
132 | res |= S_ISVTX; | |
2bad8471 EVH |
133 | } |
134 | ||
135 | return res; | |
136 | } | |
137 | ||
ee443996 EVH |
138 | /** |
139 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
140 | * @uflags: flags to convert | |
2e4bef41 | 141 | * @extended: if .u extensions are active |
ee443996 EVH |
142 | */ |
143 | ||
2e4bef41 | 144 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
145 | { |
146 | int ret; | |
147 | ||
148 | ret = 0; | |
149 | switch (uflags&3) { | |
150 | default: | |
151 | case O_RDONLY: | |
bd238fb4 | 152 | ret = P9_OREAD; |
6a3124a3 LI |
153 | break; |
154 | ||
155 | case O_WRONLY: | |
bd238fb4 | 156 | ret = P9_OWRITE; |
6a3124a3 LI |
157 | break; |
158 | ||
159 | case O_RDWR: | |
bd238fb4 | 160 | ret = P9_ORDWR; |
6a3124a3 LI |
161 | break; |
162 | } | |
163 | ||
6a3124a3 | 164 | if (uflags & O_TRUNC) |
bd238fb4 | 165 | ret |= P9_OTRUNC; |
6a3124a3 | 166 | |
2e4bef41 EVH |
167 | if (extended) { |
168 | if (uflags & O_EXCL) | |
169 | ret |= P9_OEXCL; | |
170 | ||
171 | if (uflags & O_APPEND) | |
172 | ret |= P9_OAPPEND; | |
173 | } | |
6a3124a3 LI |
174 | |
175 | return ret; | |
176 | } | |
177 | ||
2bad8471 | 178 | /** |
531b1094 | 179 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 180 | * @wstat: structure to initialize |
2bad8471 EVH |
181 | * |
182 | */ | |
183 | ||
7a4439c4 | 184 | void |
bd238fb4 | 185 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 186 | { |
531b1094 LI |
187 | wstat->type = ~0; |
188 | wstat->dev = ~0; | |
189 | wstat->qid.type = ~0; | |
190 | wstat->qid.version = ~0; | |
191 | *((long long *)&wstat->qid.path) = ~0; | |
192 | wstat->mode = ~0; | |
193 | wstat->atime = ~0; | |
194 | wstat->mtime = ~0; | |
195 | wstat->length = ~0; | |
196 | wstat->name = NULL; | |
197 | wstat->uid = NULL; | |
198 | wstat->gid = NULL; | |
199 | wstat->muid = NULL; | |
200 | wstat->n_uid = ~0; | |
201 | wstat->n_gid = ~0; | |
202 | wstat->n_muid = ~0; | |
203 | wstat->extension = NULL; | |
2bad8471 EVH |
204 | } |
205 | ||
60e78d2c AK |
206 | #ifdef CONFIG_9P_FSCACHE |
207 | /** | |
208 | * v9fs_alloc_inode - helper function to allocate an inode | |
209 | * This callback is executed before setting up the inode so that we | |
210 | * can associate a vcookie with each inode. | |
211 | * | |
212 | */ | |
213 | ||
214 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
215 | { | |
216 | struct v9fs_cookie *vcookie; | |
217 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
218 | GFP_KERNEL); | |
219 | if (!vcookie) | |
220 | return NULL; | |
221 | ||
222 | vcookie->fscache = NULL; | |
223 | vcookie->qid = NULL; | |
224 | spin_lock_init(&vcookie->lock); | |
225 | return &vcookie->inode; | |
226 | } | |
227 | ||
228 | /** | |
229 | * v9fs_destroy_inode - destroy an inode | |
230 | * | |
231 | */ | |
232 | ||
fa0d7e3d | 233 | static void v9fs_i_callback(struct rcu_head *head) |
60e78d2c | 234 | { |
fa0d7e3d NP |
235 | struct inode *inode = container_of(head, struct inode, i_rcu); |
236 | INIT_LIST_HEAD(&inode->i_dentry); | |
60e78d2c AK |
237 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); |
238 | } | |
fa0d7e3d NP |
239 | |
240 | void v9fs_destroy_inode(struct inode *inode) | |
241 | { | |
242 | call_rcu(&inode->i_rcu, v9fs_i_callback); | |
243 | } | |
60e78d2c AK |
244 | #endif |
245 | ||
2bad8471 EVH |
246 | /** |
247 | * v9fs_get_inode - helper function to setup an inode | |
248 | * @sb: superblock | |
249 | * @mode: mode to setup inode with | |
250 | * | |
251 | */ | |
252 | ||
253 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
254 | { | |
2bb54115 | 255 | int err; |
6a3124a3 | 256 | struct inode *inode; |
b501611a | 257 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 258 | |
bd238fb4 | 259 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
260 | |
261 | inode = new_inode(sb); | |
2bb54115 AK |
262 | if (!inode) { |
263 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 264 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
265 | } |
266 | ||
217f206d | 267 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
268 | inode->i_blocks = 0; |
269 | inode->i_rdev = 0; | |
270 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
271 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
272 | ||
273 | switch (mode & S_IFMT) { | |
274 | case S_IFIFO: | |
275 | case S_IFBLK: | |
276 | case S_IFCHR: | |
277 | case S_IFSOCK: | |
4b43516a MK |
278 | if (v9fs_proto_dotl(v9ses)) { |
279 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
280 | inode->i_fop = &v9fs_file_operations_dotl; | |
281 | } else if (v9fs_proto_dotu(v9ses)) { | |
282 | inode->i_op = &v9fs_file_inode_operations; | |
283 | inode->i_fop = &v9fs_file_operations; | |
284 | } else { | |
bd238fb4 | 285 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
286 | "special files without extended mode\n"); |
287 | err = -EINVAL; | |
288 | goto error; | |
2bad8471 | 289 | } |
2bb54115 AK |
290 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
291 | break; | |
292 | case S_IFREG: | |
9b6533c9 SK |
293 | if (v9fs_proto_dotl(v9ses)) { |
294 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
295 | inode->i_fop = &v9fs_file_operations_dotl; | |
296 | } else { | |
297 | inode->i_op = &v9fs_file_inode_operations; | |
298 | inode->i_fop = &v9fs_file_operations; | |
299 | } | |
300 | ||
2bb54115 | 301 | break; |
9b6533c9 | 302 | |
2bb54115 | 303 | case S_IFLNK: |
9b6533c9 SK |
304 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
305 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
306 | "legacy protocol.\n"); | |
2bb54115 AK |
307 | err = -EINVAL; |
308 | goto error; | |
309 | } | |
9b6533c9 SK |
310 | |
311 | if (v9fs_proto_dotl(v9ses)) | |
312 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
313 | else | |
314 | inode->i_op = &v9fs_symlink_inode_operations; | |
315 | ||
2bb54115 AK |
316 | break; |
317 | case S_IFDIR: | |
318 | inc_nlink(inode); | |
9b6533c9 SK |
319 | if (v9fs_proto_dotl(v9ses)) |
320 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
321 | else if (v9fs_proto_dotu(v9ses)) | |
322 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
323 | else |
324 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
325 | |
326 | if (v9fs_proto_dotl(v9ses)) | |
327 | inode->i_fop = &v9fs_dir_operations_dotl; | |
328 | else | |
329 | inode->i_fop = &v9fs_dir_operations; | |
330 | ||
2bb54115 AK |
331 | break; |
332 | default: | |
333 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
334 | mode, mode & S_IFMT); | |
335 | err = -EINVAL; | |
336 | goto error; | |
2bad8471 | 337 | } |
2bb54115 | 338 | |
2bad8471 | 339 | return inode; |
2bb54115 AK |
340 | |
341 | error: | |
342 | iput(inode); | |
343 | return ERR_PTR(err); | |
2bad8471 EVH |
344 | } |
345 | ||
bd238fb4 | 346 | /* |
6a3124a3 LI |
347 | static struct v9fs_fid* |
348 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
349 | { | |
350 | int err; | |
736c4b85 | 351 | int nfid; |
6a3124a3 LI |
352 | struct v9fs_fid *ret; |
353 | struct v9fs_fcall *fcall; | |
354 | ||
355 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
356 | if (nfid < 0) { | |
0b8dd177 | 357 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 358 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
359 | } |
360 | ||
6a3124a3 LI |
361 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
362 | &fcall); | |
363 | ||
364 | if (err < 0) { | |
41e5a6ac LI |
365 | if (fcall && fcall->id == RWALK) |
366 | goto clunk_fid; | |
367 | ||
6a3124a3 LI |
368 | PRINT_FCALL_ERROR("walk error", fcall); |
369 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
370 | goto error; | |
0b8dd177 | 371 | } |
6a3124a3 | 372 | |
3cf6429a LI |
373 | kfree(fcall); |
374 | fcall = NULL; | |
6a3124a3 LI |
375 | ret = v9fs_fid_create(v9ses, nfid); |
376 | if (!ret) { | |
377 | err = -ENOMEM; | |
378 | goto clunk_fid; | |
379 | } | |
0b8dd177 | 380 | |
6a3124a3 LI |
381 | err = v9fs_fid_insert(ret, dentry); |
382 | if (err < 0) { | |
383 | v9fs_fid_destroy(ret); | |
384 | goto clunk_fid; | |
0b8dd177 | 385 | } |
2bad8471 | 386 | |
6a3124a3 | 387 | return ret; |
2bad8471 | 388 | |
6a3124a3 LI |
389 | clunk_fid: |
390 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 391 | |
6a3124a3 LI |
392 | error: |
393 | kfree(fcall); | |
394 | return ERR_PTR(err); | |
395 | } | |
bd238fb4 | 396 | */ |
2bad8471 | 397 | |
60e78d2c AK |
398 | |
399 | /** | |
400 | * v9fs_clear_inode - release an inode | |
401 | * @inode: inode to release | |
402 | * | |
403 | */ | |
b57922d9 | 404 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 405 | { |
b57922d9 AV |
406 | truncate_inode_pages(inode->i_mapping, 0); |
407 | end_writeback(inode); | |
60e78d2c AK |
408 | filemap_fdatawrite(inode->i_mapping); |
409 | ||
410 | #ifdef CONFIG_9P_FSCACHE | |
411 | v9fs_cache_inode_put_cookie(inode); | |
412 | #endif | |
413 | } | |
414 | ||
53c06f4e | 415 | struct inode * |
f0853122 | 416 | v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
417 | struct super_block *sb) |
418 | { | |
419 | int err, umode; | |
f0853122 | 420 | struct inode *ret = NULL; |
51a87c55 | 421 | struct p9_wstat *st; |
531b1094 | 422 | |
bd238fb4 | 423 | st = p9_client_stat(fid); |
02bc3567 AK |
424 | if (IS_ERR(st)) |
425 | return ERR_CAST(st); | |
2bad8471 | 426 | |
bd238fb4 | 427 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
428 | ret = v9fs_get_inode(sb, umode); |
429 | if (IS_ERR(ret)) { | |
430 | err = PTR_ERR(ret); | |
6a3124a3 LI |
431 | goto error; |
432 | } | |
2bad8471 | 433 | |
bd238fb4 LI |
434 | v9fs_stat2inode(st, ret, sb); |
435 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
436 | |
437 | #ifdef CONFIG_9P_FSCACHE | |
438 | v9fs_vcookie_set_qid(ret, &st->qid); | |
439 | v9fs_cache_inode_get_cookie(ret); | |
440 | #endif | |
02bc3567 | 441 | p9stat_free(st); |
bd238fb4 | 442 | kfree(st); |
6a3124a3 | 443 | return ret; |
6a3124a3 | 444 | error: |
02bc3567 | 445 | p9stat_free(st); |
bd238fb4 | 446 | kfree(st); |
6a3124a3 | 447 | return ERR_PTR(err); |
2bad8471 EVH |
448 | } |
449 | ||
450 | /** | |
451 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
452 | * @dir: directory inode that is being deleted |
453 | * @file: dentry that is being deleted | |
454 | * @rmdir: removing a directory | |
2bad8471 EVH |
455 | * |
456 | */ | |
457 | ||
458 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
459 | { | |
d994f405 | 460 | int retval; |
bd238fb4 | 461 | struct inode *file_inode; |
bd238fb4 | 462 | struct p9_fid *v9fid; |
2bad8471 | 463 | |
bd238fb4 | 464 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
465 | rmdir); |
466 | ||
467 | file_inode = file->d_inode; | |
c959df9f | 468 | v9fid = v9fs_fid_clone(file); |
ba17674f | 469 | if (IS_ERR(v9fid)) |
da977b2c | 470 | return PTR_ERR(v9fid); |
2bad8471 | 471 | |
d994f405 AK |
472 | retval = p9_client_remove(v9fid); |
473 | if (!retval) | |
474 | drop_nlink(file_inode); | |
475 | return retval; | |
2bad8471 EVH |
476 | } |
477 | ||
478 | /** | |
bd238fb4 | 479 | * v9fs_create - Create a file |
ee443996 EVH |
480 | * @v9ses: session information |
481 | * @dir: directory that dentry is being created in | |
bd238fb4 | 482 | * @dentry: dentry that is being created |
0e15597e | 483 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
484 | * @perm: create permissions |
485 | * @mode: open mode | |
2bad8471 EVH |
486 | * |
487 | */ | |
bd238fb4 LI |
488 | static struct p9_fid * |
489 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
490 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 491 | { |
6a3124a3 | 492 | int err; |
bd238fb4 LI |
493 | char *name; |
494 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 495 | struct inode *inode; |
6a3124a3 | 496 | |
51a87c55 EVH |
497 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
498 | ||
bd238fb4 LI |
499 | err = 0; |
500 | ofid = NULL; | |
501 | fid = NULL; | |
502 | name = (char *) dentry->d_name.name; | |
6d27e64d | 503 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 504 | if (IS_ERR(dfid)) { |
da977b2c | 505 | err = PTR_ERR(dfid); |
6d27e64d VJ |
506 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
507 | return ERR_PTR(err); | |
da977b2c | 508 | } |
6a3124a3 | 509 | |
bd238fb4 LI |
510 | /* clone a fid to use for creation */ |
511 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
512 | if (IS_ERR(ofid)) { | |
513 | err = PTR_ERR(ofid); | |
51a87c55 | 514 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 515 | return ERR_PTR(err); |
bd238fb4 | 516 | } |
6a3124a3 | 517 | |
bd238fb4 | 518 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
519 | if (err < 0) { |
520 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 521 | goto error; |
51a87c55 | 522 | } |
6a3124a3 | 523 | |
bd238fb4 | 524 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 525 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
526 | if (IS_ERR(fid)) { |
527 | err = PTR_ERR(fid); | |
51a87c55 | 528 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 529 | fid = NULL; |
6a3124a3 | 530 | goto error; |
6d27e64d | 531 | } |
6a3124a3 | 532 | |
bd238fb4 LI |
533 | /* instantiate inode and assign the unopened fid to the dentry */ |
534 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
535 | if (IS_ERR(inode)) { |
536 | err = PTR_ERR(inode); | |
51a87c55 | 537 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
538 | goto error; |
539 | } | |
6a3124a3 | 540 | d_instantiate(dentry, inode); |
50fb6d2b AK |
541 | err = v9fs_fid_add(dentry, fid); |
542 | if (err < 0) | |
543 | goto error; | |
544 | ||
bd238fb4 | 545 | return ofid; |
6a3124a3 | 546 | |
bd238fb4 | 547 | error: |
bd238fb4 LI |
548 | if (ofid) |
549 | p9_client_clunk(ofid); | |
550 | ||
551 | if (fid) | |
552 | p9_client_clunk(fid); | |
553 | ||
554 | return ERR_PTR(err); | |
555 | } | |
556 | ||
557 | /** | |
558 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 559 | * @dir: directory inode that is being created |
bd238fb4 LI |
560 | * @dentry: dentry that is being deleted |
561 | * @mode: create permissions | |
562 | * @nd: path information | |
563 | * | |
564 | */ | |
6a3124a3 | 565 | |
bd238fb4 LI |
566 | static int |
567 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
568 | struct nameidata *nd) | |
569 | { | |
570 | int err; | |
571 | u32 perm; | |
572 | int flags; | |
573 | struct v9fs_session_info *v9ses; | |
574 | struct p9_fid *fid; | |
575 | struct file *filp; | |
576 | ||
577 | err = 0; | |
578 | fid = NULL; | |
579 | v9ses = v9fs_inode2v9ses(dir); | |
580 | perm = unixmode2p9mode(v9ses, mode); | |
581 | if (nd && nd->flags & LOOKUP_OPEN) | |
582 | flags = nd->intent.open.flags - 1; | |
583 | else | |
584 | flags = O_RDWR; | |
585 | ||
586 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
587 | v9fs_uflags2omode(flags, |
588 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
589 | if (IS_ERR(fid)) { |
590 | err = PTR_ERR(fid); | |
591 | fid = NULL; | |
592 | goto error; | |
593 | } | |
594 | ||
595 | /* if we are opening a file, assign the open fid to the file */ | |
596 | if (nd && nd->flags & LOOKUP_OPEN) { | |
877cb3d4 | 597 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
6a3124a3 | 598 | if (IS_ERR(filp)) { |
bd238fb4 LI |
599 | err = PTR_ERR(filp); |
600 | goto error; | |
6a3124a3 LI |
601 | } |
602 | ||
bd238fb4 LI |
603 | filp->private_data = fid; |
604 | } else | |
605 | p9_client_clunk(fid); | |
6a3124a3 LI |
606 | |
607 | return 0; | |
608 | ||
609 | error: | |
bd238fb4 LI |
610 | if (fid) |
611 | p9_client_clunk(fid); | |
6a3124a3 | 612 | |
6a3124a3 | 613 | return err; |
2bad8471 EVH |
614 | } |
615 | ||
616 | /** | |
617 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 618 | * @dir: inode that is being unlinked |
2bad8471 EVH |
619 | * @dentry: dentry that is being unlinked |
620 | * @mode: mode for new directory | |
621 | * | |
622 | */ | |
623 | ||
6a3124a3 | 624 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 625 | { |
6a3124a3 | 626 | int err; |
bd238fb4 | 627 | u32 perm; |
6a3124a3 | 628 | struct v9fs_session_info *v9ses; |
bd238fb4 | 629 | struct p9_fid *fid; |
6a3124a3 | 630 | |
bd238fb4 LI |
631 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
632 | err = 0; | |
6a3124a3 | 633 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 634 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
635 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
636 | if (IS_ERR(fid)) { | |
637 | err = PTR_ERR(fid); | |
638 | fid = NULL; | |
6a3124a3 LI |
639 | } |
640 | ||
bd238fb4 LI |
641 | if (fid) |
642 | p9_client_clunk(fid); | |
6a3124a3 | 643 | |
6a3124a3 | 644 | return err; |
2bad8471 EVH |
645 | } |
646 | ||
647 | /** | |
648 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
649 | * @dir: inode that is being walked from | |
650 | * @dentry: dentry that is being walked to? | |
651 | * @nameidata: path data | |
652 | * | |
653 | */ | |
654 | ||
53c06f4e | 655 | struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
2bad8471 EVH |
656 | struct nameidata *nameidata) |
657 | { | |
658 | struct super_block *sb; | |
659 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 660 | struct p9_fid *dfid, *fid; |
2bad8471 | 661 | struct inode *inode; |
bd238fb4 | 662 | char *name; |
2bad8471 EVH |
663 | int result = 0; |
664 | ||
bd238fb4 | 665 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 666 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 667 | |
11e9b49b SK |
668 | if (dentry->d_name.len > NAME_MAX) |
669 | return ERR_PTR(-ENAMETOOLONG); | |
670 | ||
2bad8471 EVH |
671 | sb = dir->i_sb; |
672 | v9ses = v9fs_inode2v9ses(dir); | |
a534c8d1 | 673 | /* We can walk d_parent because we hold the dir->i_mutex */ |
bd238fb4 LI |
674 | dfid = v9fs_fid_lookup(dentry->d_parent); |
675 | if (IS_ERR(dfid)) | |
e231c2ee | 676 | return ERR_CAST(dfid); |
bd238fb4 LI |
677 | |
678 | name = (char *) dentry->d_name.name; | |
679 | fid = p9_client_walk(dfid, 1, &name, 1); | |
680 | if (IS_ERR(fid)) { | |
681 | result = PTR_ERR(fid); | |
2bad8471 | 682 | if (result == -ENOENT) { |
85e0df24 AK |
683 | inode = NULL; |
684 | goto inst_out; | |
2bad8471 | 685 | } |
2bad8471 | 686 | |
bd238fb4 | 687 | return ERR_PTR(result); |
2bad8471 EVH |
688 | } |
689 | ||
bd238fb4 LI |
690 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
691 | if (IS_ERR(inode)) { | |
692 | result = PTR_ERR(inode); | |
693 | inode = NULL; | |
694 | goto error; | |
2bad8471 EVH |
695 | } |
696 | ||
bd238fb4 | 697 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 698 | if (result < 0) |
9856af8b | 699 | goto error_iput; |
6a3124a3 | 700 | |
85e0df24 | 701 | inst_out: |
2bad8471 | 702 | d_add(dentry, inode); |
2bad8471 EVH |
703 | return NULL; |
704 | ||
9856af8b AK |
705 | error_iput: |
706 | iput(inode); | |
bd238fb4 | 707 | error: |
62aa528e | 708 | p9_client_clunk(fid); |
da977b2c | 709 | |
2bad8471 EVH |
710 | return ERR_PTR(result); |
711 | } | |
712 | ||
713 | /** | |
714 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
715 | * @i: inode that is being unlinked | |
73c592b9 | 716 | * @d: dentry that is being unlinked |
2bad8471 EVH |
717 | * |
718 | */ | |
719 | ||
53c06f4e | 720 | int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
2bad8471 EVH |
721 | { |
722 | return v9fs_remove(i, d, 0); | |
723 | } | |
724 | ||
725 | /** | |
726 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
727 | * @i: inode that is being unlinked | |
73c592b9 | 728 | * @d: dentry that is being unlinked |
2bad8471 EVH |
729 | * |
730 | */ | |
731 | ||
53c06f4e | 732 | int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
2bad8471 EVH |
733 | { |
734 | return v9fs_remove(i, d, 1); | |
735 | } | |
736 | ||
737 | /** | |
738 | * v9fs_vfs_rename - VFS hook to rename an inode | |
739 | * @old_dir: old dir inode | |
740 | * @old_dentry: old dentry | |
741 | * @new_dir: new dir inode | |
742 | * @new_dentry: new dentry | |
743 | * | |
744 | */ | |
745 | ||
53c06f4e | 746 | int |
2bad8471 EVH |
747 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
748 | struct inode *new_dir, struct dentry *new_dentry) | |
749 | { | |
bd238fb4 LI |
750 | struct inode *old_inode; |
751 | struct v9fs_session_info *v9ses; | |
752 | struct p9_fid *oldfid; | |
753 | struct p9_fid *olddirfid; | |
754 | struct p9_fid *newdirfid; | |
755 | struct p9_wstat wstat; | |
756 | int retval; | |
2bad8471 | 757 | |
bd238fb4 LI |
758 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
759 | retval = 0; | |
760 | old_inode = old_dentry->d_inode; | |
761 | v9ses = v9fs_inode2v9ses(old_inode); | |
762 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 763 | if (IS_ERR(oldfid)) |
da977b2c EVH |
764 | return PTR_ERR(oldfid); |
765 | ||
766 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 767 | if (IS_ERR(olddirfid)) { |
da977b2c | 768 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 769 | goto done; |
da977b2c EVH |
770 | } |
771 | ||
772 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 773 | if (IS_ERR(newdirfid)) { |
da977b2c | 774 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 775 | goto clunk_olddir; |
2bad8471 EVH |
776 | } |
777 | ||
a534c8d1 | 778 | down_write(&v9ses->rename_sem); |
4681dbda SK |
779 | if (v9fs_proto_dotl(v9ses)) { |
780 | retval = p9_client_rename(oldfid, newdirfid, | |
781 | (char *) new_dentry->d_name.name); | |
782 | if (retval != -ENOSYS) | |
783 | goto clunk_newdir; | |
784 | } | |
a534c8d1 AK |
785 | if (old_dentry->d_parent != new_dentry->d_parent) { |
786 | /* | |
787 | * 9P .u can only handle file rename in the same directory | |
788 | */ | |
4681dbda | 789 | |
bd238fb4 LI |
790 | P9_DPRINTK(P9_DEBUG_ERROR, |
791 | "old dir and new dir are different\n"); | |
621997cd | 792 | retval = -EXDEV; |
bd238fb4 | 793 | goto clunk_newdir; |
2bad8471 | 794 | } |
531b1094 | 795 | v9fs_blank_wstat(&wstat); |
ba17674f | 796 | wstat.muid = v9ses->uname; |
531b1094 | 797 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 798 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 799 | |
bd238fb4 | 800 | clunk_newdir: |
a534c8d1 AK |
801 | if (!retval) |
802 | /* successful rename */ | |
803 | d_move(old_dentry, new_dentry); | |
804 | up_write(&v9ses->rename_sem); | |
22150c4f | 805 | p9_client_clunk(newdirfid); |
2bad8471 | 806 | |
bd238fb4 | 807 | clunk_olddir: |
22150c4f | 808 | p9_client_clunk(olddirfid); |
da977b2c | 809 | |
bd238fb4 | 810 | done: |
2bad8471 EVH |
811 | return retval; |
812 | } | |
813 | ||
814 | /** | |
943ffb58 | 815 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
816 | * @mnt: mount information |
817 | * @dentry: file to get attributes on | |
818 | * @stat: metadata structure to populate | |
2bad8471 EVH |
819 | * |
820 | */ | |
821 | ||
822 | static int | |
823 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
824 | struct kstat *stat) | |
825 | { | |
bd238fb4 LI |
826 | int err; |
827 | struct v9fs_session_info *v9ses; | |
828 | struct p9_fid *fid; | |
51a87c55 | 829 | struct p9_wstat *st; |
bd238fb4 LI |
830 | |
831 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
832 | err = -EPERM; | |
833 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 834 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
835 | return simple_getattr(mnt, dentry, stat); |
836 | ||
bd238fb4 LI |
837 | fid = v9fs_fid_lookup(dentry); |
838 | if (IS_ERR(fid)) | |
da977b2c | 839 | return PTR_ERR(fid); |
2bad8471 | 840 | |
bd238fb4 LI |
841 | st = p9_client_stat(fid); |
842 | if (IS_ERR(st)) | |
843 | return PTR_ERR(st); | |
2bad8471 | 844 | |
bd238fb4 | 845 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 846 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 847 | |
62b2be59 | 848 | p9stat_free(st); |
bd238fb4 LI |
849 | kfree(st); |
850 | return 0; | |
2bad8471 EVH |
851 | } |
852 | ||
853 | /** | |
854 | * v9fs_vfs_setattr - set file metadata | |
855 | * @dentry: file whose metadata to set | |
856 | * @iattr: metadata assignment structure | |
857 | * | |
858 | */ | |
859 | ||
860 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
861 | { | |
bd238fb4 LI |
862 | int retval; |
863 | struct v9fs_session_info *v9ses; | |
864 | struct p9_fid *fid; | |
865 | struct p9_wstat wstat; | |
2bad8471 | 866 | |
bd238fb4 LI |
867 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
868 | retval = -EPERM; | |
869 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
870 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
871 | if(IS_ERR(fid)) |
872 | return PTR_ERR(fid); | |
2bad8471 | 873 | |
531b1094 | 874 | v9fs_blank_wstat(&wstat); |
2bad8471 | 875 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 876 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
877 | |
878 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 879 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
880 | |
881 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 882 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
883 | |
884 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 885 | wstat.length = iattr->ia_size; |
2bad8471 | 886 | |
dd6102fb | 887 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
888 | if (iattr->ia_valid & ATTR_UID) |
889 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 890 | |
531b1094 LI |
891 | if (iattr->ia_valid & ATTR_GID) |
892 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
893 | } |
894 | ||
bd238fb4 | 895 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
896 | if (retval < 0) |
897 | return retval; | |
2bad8471 | 898 | |
1025774c CH |
899 | if ((iattr->ia_valid & ATTR_SIZE) && |
900 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
901 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
902 | if (retval) | |
903 | return retval; | |
904 | } | |
2bad8471 | 905 | |
1025774c CH |
906 | setattr_copy(dentry->d_inode, iattr); |
907 | mark_inode_dirty(dentry->d_inode); | |
908 | return 0; | |
2bad8471 EVH |
909 | } |
910 | ||
911 | /** | |
531b1094 LI |
912 | * v9fs_stat2inode - populate an inode structure with mistat info |
913 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
914 | * @inode: inode to populate |
915 | * @sb: superblock of filesystem | |
916 | * | |
917 | */ | |
918 | ||
919 | void | |
51a87c55 | 920 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 921 | struct super_block *sb) |
2bad8471 | 922 | { |
531b1094 | 923 | char ext[32]; |
5717144a AK |
924 | char tag_name[14]; |
925 | unsigned int i_nlink; | |
2bad8471 EVH |
926 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
927 | ||
928 | inode->i_nlink = 1; | |
929 | ||
531b1094 LI |
930 | inode->i_atime.tv_sec = stat->atime; |
931 | inode->i_mtime.tv_sec = stat->mtime; | |
932 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 933 | |
bd32b82d LI |
934 | inode->i_uid = v9ses->dfltuid; |
935 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 936 | |
dd6102fb | 937 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
938 | inode->i_uid = stat->n_uid; |
939 | inode->i_gid = stat->n_gid; | |
2bad8471 | 940 | } |
5717144a AK |
941 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
942 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
943 | /* | |
944 | * Hadlink support got added later to | |
945 | * to the .u extension. So there can be | |
946 | * server out there that doesn't support | |
947 | * this even with .u extension. So check | |
948 | * for non NULL stat->extension | |
949 | */ | |
950 | strncpy(ext, stat->extension, sizeof(ext)); | |
951 | /* HARDLINKCOUNT %u */ | |
952 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
953 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
954 | inode->i_nlink = i_nlink; | |
955 | } | |
956 | } | |
531b1094 | 957 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
958 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
959 | char type = 0; | |
960 | int major = -1; | |
961 | int minor = -1; | |
531b1094 | 962 | |
51a87c55 | 963 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 964 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
965 | switch (type) { |
966 | case 'c': | |
967 | inode->i_mode &= ~S_IFBLK; | |
968 | inode->i_mode |= S_IFCHR; | |
969 | break; | |
970 | case 'b': | |
971 | break; | |
972 | default: | |
bd238fb4 | 973 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
974 | "Unknown special type %c %s\n", type, |
975 | stat->extension); | |
2bad8471 EVH |
976 | }; |
977 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 978 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
979 | } else |
980 | inode->i_rdev = 0; | |
981 | ||
7549ae3e | 982 | i_size_write(inode, stat->length); |
2bad8471 | 983 | |
bd238fb4 | 984 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 985 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
986 | } |
987 | ||
988 | /** | |
989 | * v9fs_qid2ino - convert qid into inode number | |
990 | * @qid: qid to hash | |
991 | * | |
992 | * BUG: potential for inode number collisions? | |
993 | */ | |
994 | ||
bd238fb4 | 995 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
996 | { |
997 | u64 path = qid->path + 2; | |
998 | ino_t i = 0; | |
999 | ||
1000 | if (sizeof(ino_t) == sizeof(path)) | |
1001 | memcpy(&i, &path, sizeof(ino_t)); | |
1002 | else | |
1003 | i = (ino_t) (path ^ (path >> 32)); | |
1004 | ||
1005 | return i; | |
1006 | } | |
1007 | ||
2bad8471 EVH |
1008 | /** |
1009 | * v9fs_readlink - read a symlink's location (internal version) | |
1010 | * @dentry: dentry for symlink | |
73c592b9 | 1011 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1012 | * @buflen: length of buffer |
1013 | * | |
1014 | */ | |
1015 | ||
1016 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1017 | { | |
bd238fb4 | 1018 | int retval; |
2bad8471 | 1019 | |
bd238fb4 LI |
1020 | struct v9fs_session_info *v9ses; |
1021 | struct p9_fid *fid; | |
51a87c55 | 1022 | struct p9_wstat *st; |
2bad8471 | 1023 | |
bd238fb4 LI |
1024 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1025 | retval = -EPERM; | |
1026 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1027 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1028 | if (IS_ERR(fid)) |
da977b2c | 1029 | return PTR_ERR(fid); |
2bad8471 | 1030 | |
329176cc | 1031 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1032 | return -EBADF; |
2bad8471 | 1033 | |
bd238fb4 LI |
1034 | st = p9_client_stat(fid); |
1035 | if (IS_ERR(st)) | |
1036 | return PTR_ERR(st); | |
2bad8471 | 1037 | |
bd238fb4 | 1038 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1039 | retval = -EINVAL; |
bd238fb4 | 1040 | goto done; |
2bad8471 EVH |
1041 | } |
1042 | ||
1043 | /* copy extension buffer into buffer */ | |
51a87c55 | 1044 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1045 | |
bd238fb4 | 1046 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1047 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1048 | |
2511cd0b | 1049 | retval = strnlen(buffer, buflen); |
bd238fb4 | 1050 | done: |
62b2be59 | 1051 | p9stat_free(st); |
bd238fb4 | 1052 | kfree(st); |
2bad8471 EVH |
1053 | return retval; |
1054 | } | |
1055 | ||
2bad8471 EVH |
1056 | /** |
1057 | * v9fs_vfs_follow_link - follow a symlink path | |
1058 | * @dentry: dentry for symlink | |
1059 | * @nd: nameidata | |
1060 | * | |
1061 | */ | |
1062 | ||
1063 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1064 | { | |
1065 | int len = 0; | |
1066 | char *link = __getname(); | |
1067 | ||
bd238fb4 | 1068 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1069 | |
1070 | if (!link) | |
1071 | link = ERR_PTR(-ENOMEM); | |
1072 | else { | |
16cce6d2 | 1073 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1074 | |
1075 | if (len < 0) { | |
ce44eeb6 | 1076 | __putname(link); |
2bad8471 EVH |
1077 | link = ERR_PTR(len); |
1078 | } else | |
2511cd0b | 1079 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1080 | } |
1081 | nd_set_link(nd, link); | |
1082 | ||
1083 | return NULL; | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * v9fs_vfs_put_link - release a symlink path | |
1088 | * @dentry: dentry for symlink | |
1089 | * @nd: nameidata | |
ee443996 | 1090 | * @p: unused |
2bad8471 EVH |
1091 | * |
1092 | */ | |
1093 | ||
53c06f4e | 1094 | void |
ee443996 | 1095 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
2bad8471 EVH |
1096 | { |
1097 | char *s = nd_get_link(nd); | |
1098 | ||
6ff23207 DG |
1099 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1100 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1101 | if (!IS_ERR(s)) |
ce44eeb6 | 1102 | __putname(s); |
2bad8471 EVH |
1103 | } |
1104 | ||
ee443996 EVH |
1105 | /** |
1106 | * v9fs_vfs_mkspecial - create a special file | |
1107 | * @dir: inode to create special file in | |
1108 | * @dentry: dentry to create | |
1109 | * @mode: mode to create special file | |
1110 | * @extension: 9p2000.u format extension string representing special file | |
1111 | * | |
1112 | */ | |
1113 | ||
531b1094 LI |
1114 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1115 | int mode, const char *extension) | |
2bad8471 | 1116 | { |
bd238fb4 | 1117 | u32 perm; |
531b1094 | 1118 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1119 | struct p9_fid *fid; |
2bad8471 | 1120 | |
6a3124a3 | 1121 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1122 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1123 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1124 | return -EPERM; |
2bad8471 EVH |
1125 | } |
1126 | ||
da977b2c | 1127 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1128 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1129 | P9_OREAD); | |
1130 | if (IS_ERR(fid)) | |
1131 | return PTR_ERR(fid); | |
da977b2c | 1132 | |
bd238fb4 | 1133 | p9_client_clunk(fid); |
6a3124a3 | 1134 | return 0; |
531b1094 LI |
1135 | } |
1136 | ||
1137 | /** | |
1138 | * v9fs_vfs_symlink - helper function to create symlinks | |
1139 | * @dir: directory inode containing symlink | |
1140 | * @dentry: dentry for symlink | |
1141 | * @symname: symlink data | |
1142 | * | |
ee443996 | 1143 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1144 | * |
1145 | */ | |
1146 | ||
1147 | static int | |
1148 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1149 | { | |
bd238fb4 LI |
1150 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1151 | dentry->d_name.name, symname); | |
531b1094 LI |
1152 | |
1153 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * v9fs_vfs_link - create a hardlink | |
1158 | * @old_dentry: dentry for file to link to | |
1159 | * @dir: inode destination for new link | |
1160 | * @dentry: dentry for link | |
1161 | * | |
1162 | */ | |
1163 | ||
531b1094 LI |
1164 | static int |
1165 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1166 | struct dentry *dentry) | |
1167 | { | |
1168 | int retval; | |
bd238fb4 | 1169 | struct p9_fid *oldfid; |
531b1094 LI |
1170 | char *name; |
1171 | ||
bd238fb4 LI |
1172 | P9_DPRINTK(P9_DEBUG_VFS, |
1173 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1174 | old_dentry->d_name.name); |
1175 | ||
da977b2c | 1176 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1177 | if (IS_ERR(oldfid)) |
da977b2c | 1178 | return PTR_ERR(oldfid); |
531b1094 LI |
1179 | |
1180 | name = __getname(); | |
da977b2c EVH |
1181 | if (unlikely(!name)) { |
1182 | retval = -ENOMEM; | |
1183 | goto clunk_fid; | |
1184 | } | |
0710d36a | 1185 | |
16cce6d2 | 1186 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1187 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1188 | __putname(name); |
2bad8471 | 1189 | |
da977b2c | 1190 | clunk_fid: |
bd238fb4 | 1191 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1192 | return retval; |
1193 | } | |
1194 | ||
1195 | /** | |
1196 | * v9fs_vfs_mknod - create a special file | |
1197 | * @dir: inode destination for new link | |
1198 | * @dentry: dentry for file | |
1199 | * @mode: mode for creation | |
ee443996 | 1200 | * @rdev: device associated with special file |
2bad8471 EVH |
1201 | * |
1202 | */ | |
1203 | ||
1204 | static int | |
1205 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1206 | { | |
531b1094 LI |
1207 | int retval; |
1208 | char *name; | |
2bad8471 | 1209 | |
bd238fb4 LI |
1210 | P9_DPRINTK(P9_DEBUG_VFS, |
1211 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1212 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1213 | ||
531b1094 LI |
1214 | if (!new_valid_dev(rdev)) |
1215 | return -EINVAL; | |
2bad8471 | 1216 | |
531b1094 | 1217 | name = __getname(); |
c0291a05 ET |
1218 | if (!name) |
1219 | return -ENOMEM; | |
2bad8471 EVH |
1220 | /* build extension */ |
1221 | if (S_ISBLK(mode)) | |
531b1094 | 1222 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1223 | else if (S_ISCHR(mode)) |
531b1094 | 1224 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1225 | else if (S_ISFIFO(mode)) |
531b1094 | 1226 | *name = 0; |
75cc5c9b VJ |
1227 | else if (S_ISSOCK(mode)) |
1228 | *name = 0; | |
2bad8471 | 1229 | else { |
531b1094 LI |
1230 | __putname(name); |
1231 | return -EINVAL; | |
2bad8471 EVH |
1232 | } |
1233 | ||
531b1094 LI |
1234 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1235 | __putname(name); | |
2bad8471 EVH |
1236 | |
1237 | return retval; | |
1238 | } | |
1239 | ||
9b6533c9 SK |
1240 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1241 | .create = v9fs_vfs_create, | |
1242 | .lookup = v9fs_vfs_lookup, | |
1243 | .symlink = v9fs_vfs_symlink, | |
50cc42ff | 1244 | .link = v9fs_vfs_link, |
9b6533c9 SK |
1245 | .unlink = v9fs_vfs_unlink, |
1246 | .mkdir = v9fs_vfs_mkdir, | |
1247 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 1248 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
1249 | .rename = v9fs_vfs_rename, |
1250 | .getattr = v9fs_vfs_getattr, | |
1251 | .setattr = v9fs_vfs_setattr, | |
1252 | }; | |
1253 | ||
754661f1 | 1254 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1255 | .create = v9fs_vfs_create, |
1256 | .lookup = v9fs_vfs_lookup, | |
1257 | .unlink = v9fs_vfs_unlink, | |
1258 | .mkdir = v9fs_vfs_mkdir, | |
1259 | .rmdir = v9fs_vfs_rmdir, | |
1260 | .mknod = v9fs_vfs_mknod, | |
1261 | .rename = v9fs_vfs_rename, | |
1262 | .getattr = v9fs_vfs_getattr, | |
1263 | .setattr = v9fs_vfs_setattr, | |
1264 | }; | |
1265 | ||
754661f1 | 1266 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1267 | .getattr = v9fs_vfs_getattr, |
1268 | .setattr = v9fs_vfs_setattr, | |
1269 | }; | |
1270 | ||
754661f1 | 1271 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1272 | .readlink = generic_readlink, |
2bad8471 EVH |
1273 | .follow_link = v9fs_vfs_follow_link, |
1274 | .put_link = v9fs_vfs_put_link, | |
1275 | .getattr = v9fs_vfs_getattr, | |
1276 | .setattr = v9fs_vfs_setattr, | |
1277 | }; | |
9b6533c9 | 1278 |