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> |
bd238fb4 LI |
37 | #include <net/9p/9p.h> |
38 | #include <net/9p/client.h> | |
2bad8471 | 39 | |
2bad8471 | 40 | #include "v9fs.h" |
2bad8471 | 41 | #include "v9fs_vfs.h" |
2bad8471 | 42 | #include "fid.h" |
60e78d2c | 43 | #include "cache.h" |
2bad8471 | 44 | |
754661f1 AV |
45 | static const struct inode_operations v9fs_dir_inode_operations; |
46 | static const struct inode_operations v9fs_dir_inode_operations_ext; | |
47 | static const struct inode_operations v9fs_file_inode_operations; | |
48 | static const struct inode_operations v9fs_symlink_inode_operations; | |
2bad8471 EVH |
49 | |
50 | /** | |
51 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
52 | * @v9ses: v9fs session information | |
53 | * @mode: mode to convert | |
54 | * | |
55 | */ | |
56 | ||
73c592b9 | 57 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
58 | { |
59 | int res; | |
60 | res = mode & 0777; | |
61 | if (S_ISDIR(mode)) | |
bd238fb4 | 62 | res |= P9_DMDIR; |
2405669b | 63 | if (v9fs_extended(v9ses)) { |
2bad8471 | 64 | if (S_ISLNK(mode)) |
bd238fb4 | 65 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
66 | if (v9ses->nodev == 0) { |
67 | if (S_ISSOCK(mode)) | |
bd238fb4 | 68 | res |= P9_DMSOCKET; |
2bad8471 | 69 | if (S_ISFIFO(mode)) |
bd238fb4 | 70 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 71 | if (S_ISBLK(mode)) |
bd238fb4 | 72 | res |= P9_DMDEVICE; |
2bad8471 | 73 | if (S_ISCHR(mode)) |
bd238fb4 | 74 | res |= P9_DMDEVICE; |
2bad8471 EVH |
75 | } |
76 | ||
77 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 78 | res |= P9_DMSETUID; |
2bad8471 | 79 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 80 | res |= P9_DMSETGID; |
d199d652 AL |
81 | if ((mode & S_ISVTX) == S_ISVTX) |
82 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
83 | if ((mode & P9_DMLINK)) |
84 | res |= P9_DMLINK; | |
2bad8471 EVH |
85 | } |
86 | ||
87 | return res; | |
88 | } | |
89 | ||
90 | /** | |
91 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
92 | * @v9ses: v9fs session information | |
93 | * @mode: mode to convert | |
94 | * | |
95 | */ | |
96 | ||
73c592b9 | 97 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
98 | { |
99 | int res; | |
100 | ||
101 | res = mode & 0777; | |
102 | ||
bd238fb4 | 103 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 104 | res |= S_IFDIR; |
2405669b | 105 | else if ((mode & P9_DMSYMLINK) && (v9fs_extended(v9ses))) |
2bad8471 | 106 | res |= S_IFLNK; |
2405669b | 107 | else if ((mode & P9_DMSOCKET) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
108 | && (v9ses->nodev == 0)) |
109 | res |= S_IFSOCK; | |
2405669b | 110 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
111 | && (v9ses->nodev == 0)) |
112 | res |= S_IFIFO; | |
2405669b | 113 | else if ((mode & P9_DMDEVICE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
114 | && (v9ses->nodev == 0)) |
115 | res |= S_IFBLK; | |
116 | else | |
117 | res |= S_IFREG; | |
118 | ||
2405669b | 119 | if (v9fs_extended(v9ses)) { |
bd238fb4 | 120 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
121 | res |= S_ISUID; |
122 | ||
bd238fb4 | 123 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 124 | res |= S_ISGID; |
d199d652 AL |
125 | |
126 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
127 | res |= S_ISVTX; | |
2bad8471 EVH |
128 | } |
129 | ||
130 | return res; | |
131 | } | |
132 | ||
ee443996 EVH |
133 | /** |
134 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
135 | * @uflags: flags to convert | |
2e4bef41 | 136 | * @extended: if .u extensions are active |
ee443996 EVH |
137 | */ |
138 | ||
2e4bef41 | 139 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
140 | { |
141 | int ret; | |
142 | ||
143 | ret = 0; | |
144 | switch (uflags&3) { | |
145 | default: | |
146 | case O_RDONLY: | |
bd238fb4 | 147 | ret = P9_OREAD; |
6a3124a3 LI |
148 | break; |
149 | ||
150 | case O_WRONLY: | |
bd238fb4 | 151 | ret = P9_OWRITE; |
6a3124a3 LI |
152 | break; |
153 | ||
154 | case O_RDWR: | |
bd238fb4 | 155 | ret = P9_ORDWR; |
6a3124a3 LI |
156 | break; |
157 | } | |
158 | ||
6a3124a3 | 159 | if (uflags & O_TRUNC) |
bd238fb4 | 160 | ret |= P9_OTRUNC; |
6a3124a3 | 161 | |
2e4bef41 EVH |
162 | if (extended) { |
163 | if (uflags & O_EXCL) | |
164 | ret |= P9_OEXCL; | |
165 | ||
166 | if (uflags & O_APPEND) | |
167 | ret |= P9_OAPPEND; | |
168 | } | |
6a3124a3 LI |
169 | |
170 | return ret; | |
171 | } | |
172 | ||
2bad8471 | 173 | /** |
531b1094 | 174 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 175 | * @wstat: structure to initialize |
2bad8471 EVH |
176 | * |
177 | */ | |
178 | ||
73c592b9 | 179 | static void |
bd238fb4 | 180 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 181 | { |
531b1094 LI |
182 | wstat->type = ~0; |
183 | wstat->dev = ~0; | |
184 | wstat->qid.type = ~0; | |
185 | wstat->qid.version = ~0; | |
186 | *((long long *)&wstat->qid.path) = ~0; | |
187 | wstat->mode = ~0; | |
188 | wstat->atime = ~0; | |
189 | wstat->mtime = ~0; | |
190 | wstat->length = ~0; | |
191 | wstat->name = NULL; | |
192 | wstat->uid = NULL; | |
193 | wstat->gid = NULL; | |
194 | wstat->muid = NULL; | |
195 | wstat->n_uid = ~0; | |
196 | wstat->n_gid = ~0; | |
197 | wstat->n_muid = ~0; | |
198 | wstat->extension = NULL; | |
2bad8471 EVH |
199 | } |
200 | ||
60e78d2c AK |
201 | #ifdef CONFIG_9P_FSCACHE |
202 | /** | |
203 | * v9fs_alloc_inode - helper function to allocate an inode | |
204 | * This callback is executed before setting up the inode so that we | |
205 | * can associate a vcookie with each inode. | |
206 | * | |
207 | */ | |
208 | ||
209 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
210 | { | |
211 | struct v9fs_cookie *vcookie; | |
212 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
213 | GFP_KERNEL); | |
214 | if (!vcookie) | |
215 | return NULL; | |
216 | ||
217 | vcookie->fscache = NULL; | |
218 | vcookie->qid = NULL; | |
219 | spin_lock_init(&vcookie->lock); | |
220 | return &vcookie->inode; | |
221 | } | |
222 | ||
223 | /** | |
224 | * v9fs_destroy_inode - destroy an inode | |
225 | * | |
226 | */ | |
227 | ||
228 | void v9fs_destroy_inode(struct inode *inode) | |
229 | { | |
230 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); | |
231 | } | |
232 | #endif | |
233 | ||
2bad8471 EVH |
234 | /** |
235 | * v9fs_get_inode - helper function to setup an inode | |
236 | * @sb: superblock | |
237 | * @mode: mode to setup inode with | |
238 | * | |
239 | */ | |
240 | ||
241 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
242 | { | |
2bb54115 | 243 | int err; |
6a3124a3 | 244 | struct inode *inode; |
b501611a | 245 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 246 | |
bd238fb4 | 247 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
248 | |
249 | inode = new_inode(sb); | |
2bb54115 AK |
250 | if (!inode) { |
251 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 252 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
253 | } |
254 | ||
255 | inode->i_mode = mode; | |
256 | inode->i_uid = current_fsuid(); | |
257 | inode->i_gid = current_fsgid(); | |
258 | inode->i_blocks = 0; | |
259 | inode->i_rdev = 0; | |
260 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
261 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
262 | ||
263 | switch (mode & S_IFMT) { | |
264 | case S_IFIFO: | |
265 | case S_IFBLK: | |
266 | case S_IFCHR: | |
267 | case S_IFSOCK: | |
268 | if (!v9fs_extended(v9ses)) { | |
bd238fb4 | 269 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
270 | "special files without extended mode\n"); |
271 | err = -EINVAL; | |
272 | goto error; | |
2bad8471 | 273 | } |
2bb54115 AK |
274 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
275 | break; | |
276 | case S_IFREG: | |
277 | inode->i_op = &v9fs_file_inode_operations; | |
278 | inode->i_fop = &v9fs_file_operations; | |
279 | break; | |
280 | case S_IFLNK: | |
281 | if (!v9fs_extended(v9ses)) { | |
282 | P9_DPRINTK(P9_DEBUG_ERROR, | |
283 | "extended modes used w/o 9P2000.u\n"); | |
284 | err = -EINVAL; | |
285 | goto error; | |
286 | } | |
287 | inode->i_op = &v9fs_symlink_inode_operations; | |
288 | break; | |
289 | case S_IFDIR: | |
290 | inc_nlink(inode); | |
291 | if (v9fs_extended(v9ses)) | |
292 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
293 | else | |
294 | inode->i_op = &v9fs_dir_inode_operations; | |
295 | inode->i_fop = &v9fs_dir_operations; | |
296 | break; | |
297 | default: | |
298 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
299 | mode, mode & S_IFMT); | |
300 | err = -EINVAL; | |
301 | goto error; | |
2bad8471 | 302 | } |
2bb54115 | 303 | |
2bad8471 | 304 | return inode; |
2bb54115 AK |
305 | |
306 | error: | |
307 | iput(inode); | |
308 | return ERR_PTR(err); | |
2bad8471 EVH |
309 | } |
310 | ||
bd238fb4 | 311 | /* |
6a3124a3 LI |
312 | static struct v9fs_fid* |
313 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
314 | { | |
315 | int err; | |
736c4b85 | 316 | int nfid; |
6a3124a3 LI |
317 | struct v9fs_fid *ret; |
318 | struct v9fs_fcall *fcall; | |
319 | ||
320 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
321 | if (nfid < 0) { | |
0b8dd177 | 322 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 323 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
324 | } |
325 | ||
6a3124a3 LI |
326 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
327 | &fcall); | |
328 | ||
329 | if (err < 0) { | |
41e5a6ac LI |
330 | if (fcall && fcall->id == RWALK) |
331 | goto clunk_fid; | |
332 | ||
6a3124a3 LI |
333 | PRINT_FCALL_ERROR("walk error", fcall); |
334 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
335 | goto error; | |
0b8dd177 | 336 | } |
6a3124a3 | 337 | |
3cf6429a LI |
338 | kfree(fcall); |
339 | fcall = NULL; | |
6a3124a3 LI |
340 | ret = v9fs_fid_create(v9ses, nfid); |
341 | if (!ret) { | |
342 | err = -ENOMEM; | |
343 | goto clunk_fid; | |
344 | } | |
0b8dd177 | 345 | |
6a3124a3 LI |
346 | err = v9fs_fid_insert(ret, dentry); |
347 | if (err < 0) { | |
348 | v9fs_fid_destroy(ret); | |
349 | goto clunk_fid; | |
0b8dd177 | 350 | } |
2bad8471 | 351 | |
6a3124a3 | 352 | return ret; |
2bad8471 | 353 | |
6a3124a3 LI |
354 | clunk_fid: |
355 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 356 | |
6a3124a3 LI |
357 | error: |
358 | kfree(fcall); | |
359 | return ERR_PTR(err); | |
360 | } | |
bd238fb4 | 361 | */ |
2bad8471 | 362 | |
60e78d2c AK |
363 | |
364 | /** | |
365 | * v9fs_clear_inode - release an inode | |
366 | * @inode: inode to release | |
367 | * | |
368 | */ | |
369 | void v9fs_clear_inode(struct inode *inode) | |
370 | { | |
371 | filemap_fdatawrite(inode->i_mapping); | |
372 | ||
373 | #ifdef CONFIG_9P_FSCACHE | |
374 | v9fs_cache_inode_put_cookie(inode); | |
375 | #endif | |
376 | } | |
377 | ||
ee443996 EVH |
378 | /** |
379 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
380 | * @v9ses: session information | |
381 | * @fid: fid to issue attribute request for | |
382 | * @sb: superblock on which to create inode | |
383 | * | |
384 | */ | |
385 | ||
5174fdab | 386 | static struct inode * |
bd238fb4 | 387 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
388 | struct super_block *sb) |
389 | { | |
390 | int err, umode; | |
391 | struct inode *ret; | |
51a87c55 | 392 | struct p9_wstat *st; |
531b1094 | 393 | |
6a3124a3 | 394 | ret = NULL; |
bd238fb4 | 395 | st = p9_client_stat(fid); |
02bc3567 AK |
396 | if (IS_ERR(st)) |
397 | return ERR_CAST(st); | |
2bad8471 | 398 | |
bd238fb4 | 399 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
400 | ret = v9fs_get_inode(sb, umode); |
401 | if (IS_ERR(ret)) { | |
402 | err = PTR_ERR(ret); | |
6a3124a3 LI |
403 | goto error; |
404 | } | |
2bad8471 | 405 | |
bd238fb4 LI |
406 | v9fs_stat2inode(st, ret, sb); |
407 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
408 | |
409 | #ifdef CONFIG_9P_FSCACHE | |
410 | v9fs_vcookie_set_qid(ret, &st->qid); | |
411 | v9fs_cache_inode_get_cookie(ret); | |
412 | #endif | |
02bc3567 | 413 | p9stat_free(st); |
bd238fb4 | 414 | kfree(st); |
60e78d2c | 415 | |
6a3124a3 | 416 | return ret; |
2bad8471 | 417 | |
6a3124a3 | 418 | error: |
02bc3567 | 419 | p9stat_free(st); |
bd238fb4 | 420 | kfree(st); |
6a3124a3 | 421 | return ERR_PTR(err); |
2bad8471 EVH |
422 | } |
423 | ||
424 | /** | |
425 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
426 | * @dir: directory inode that is being deleted |
427 | * @file: dentry that is being deleted | |
428 | * @rmdir: removing a directory | |
2bad8471 EVH |
429 | * |
430 | */ | |
431 | ||
432 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
433 | { | |
bd238fb4 LI |
434 | struct inode *file_inode; |
435 | struct v9fs_session_info *v9ses; | |
436 | struct p9_fid *v9fid; | |
2bad8471 | 437 | |
bd238fb4 | 438 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
439 | rmdir); |
440 | ||
441 | file_inode = file->d_inode; | |
2bad8471 | 442 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 443 | v9fid = v9fs_fid_clone(file); |
ba17674f | 444 | if (IS_ERR(v9fid)) |
da977b2c | 445 | return PTR_ERR(v9fid); |
2bad8471 | 446 | |
bd238fb4 | 447 | return p9_client_remove(v9fid); |
2bad8471 EVH |
448 | } |
449 | ||
6a3124a3 LI |
450 | static int |
451 | v9fs_open_created(struct inode *inode, struct file *file) | |
452 | { | |
453 | return 0; | |
454 | } | |
455 | ||
bd238fb4 | 456 | |
2bad8471 | 457 | /** |
bd238fb4 | 458 | * v9fs_create - Create a file |
ee443996 EVH |
459 | * @v9ses: session information |
460 | * @dir: directory that dentry is being created in | |
bd238fb4 | 461 | * @dentry: dentry that is being created |
0e15597e | 462 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
463 | * @perm: create permissions |
464 | * @mode: open mode | |
2bad8471 EVH |
465 | * |
466 | */ | |
bd238fb4 LI |
467 | static struct p9_fid * |
468 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
469 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 470 | { |
6a3124a3 | 471 | int err; |
bd238fb4 LI |
472 | char *name; |
473 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 474 | struct inode *inode; |
6a3124a3 | 475 | |
51a87c55 EVH |
476 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
477 | ||
bd238fb4 LI |
478 | err = 0; |
479 | ofid = NULL; | |
480 | fid = NULL; | |
481 | name = (char *) dentry->d_name.name; | |
da977b2c | 482 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 483 | if (IS_ERR(dfid)) { |
da977b2c | 484 | err = PTR_ERR(dfid); |
51a87c55 | 485 | P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); |
bd238fb4 | 486 | dfid = NULL; |
da977b2c EVH |
487 | goto error; |
488 | } | |
6a3124a3 | 489 | |
bd238fb4 LI |
490 | /* clone a fid to use for creation */ |
491 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
492 | if (IS_ERR(ofid)) { | |
493 | err = PTR_ERR(ofid); | |
51a87c55 | 494 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 LI |
495 | ofid = NULL; |
496 | goto error; | |
497 | } | |
6a3124a3 | 498 | |
bd238fb4 | 499 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
500 | if (err < 0) { |
501 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 502 | goto error; |
51a87c55 | 503 | } |
6a3124a3 | 504 | |
bd238fb4 LI |
505 | /* now walk from the parent so we can get unopened fid */ |
506 | fid = p9_client_walk(dfid, 1, &name, 0); | |
507 | if (IS_ERR(fid)) { | |
508 | err = PTR_ERR(fid); | |
51a87c55 | 509 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 510 | fid = NULL; |
6a3124a3 | 511 | goto error; |
bd238fb4 LI |
512 | } else |
513 | dfid = NULL; | |
6a3124a3 | 514 | |
bd238fb4 LI |
515 | /* instantiate inode and assign the unopened fid to the dentry */ |
516 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
517 | if (IS_ERR(inode)) { |
518 | err = PTR_ERR(inode); | |
51a87c55 | 519 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
520 | goto error; |
521 | } | |
522 | ||
ba17674f | 523 | if (v9ses->cache) |
e03abc0c EVH |
524 | dentry->d_op = &v9fs_cached_dentry_operations; |
525 | else | |
526 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 527 | |
6a3124a3 | 528 | d_instantiate(dentry, inode); |
50fb6d2b AK |
529 | err = v9fs_fid_add(dentry, fid); |
530 | if (err < 0) | |
531 | goto error; | |
532 | ||
bd238fb4 | 533 | return ofid; |
6a3124a3 | 534 | |
bd238fb4 LI |
535 | error: |
536 | if (dfid) | |
537 | p9_client_clunk(dfid); | |
538 | ||
539 | if (ofid) | |
540 | p9_client_clunk(ofid); | |
541 | ||
542 | if (fid) | |
543 | p9_client_clunk(fid); | |
544 | ||
545 | return ERR_PTR(err); | |
546 | } | |
547 | ||
548 | /** | |
549 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 550 | * @dir: directory inode that is being created |
bd238fb4 LI |
551 | * @dentry: dentry that is being deleted |
552 | * @mode: create permissions | |
553 | * @nd: path information | |
554 | * | |
555 | */ | |
6a3124a3 | 556 | |
bd238fb4 LI |
557 | static int |
558 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
559 | struct nameidata *nd) | |
560 | { | |
561 | int err; | |
562 | u32 perm; | |
563 | int flags; | |
564 | struct v9fs_session_info *v9ses; | |
565 | struct p9_fid *fid; | |
566 | struct file *filp; | |
567 | ||
568 | err = 0; | |
569 | fid = NULL; | |
570 | v9ses = v9fs_inode2v9ses(dir); | |
571 | perm = unixmode2p9mode(v9ses, mode); | |
572 | if (nd && nd->flags & LOOKUP_OPEN) | |
573 | flags = nd->intent.open.flags - 1; | |
574 | else | |
575 | flags = O_RDWR; | |
576 | ||
577 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
2e4bef41 | 578 | v9fs_uflags2omode(flags, v9fs_extended(v9ses))); |
bd238fb4 LI |
579 | if (IS_ERR(fid)) { |
580 | err = PTR_ERR(fid); | |
581 | fid = NULL; | |
582 | goto error; | |
583 | } | |
584 | ||
585 | /* if we are opening a file, assign the open fid to the file */ | |
586 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
587 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
588 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
589 | err = PTR_ERR(filp); |
590 | goto error; | |
6a3124a3 LI |
591 | } |
592 | ||
bd238fb4 LI |
593 | filp->private_data = fid; |
594 | } else | |
595 | p9_client_clunk(fid); | |
6a3124a3 LI |
596 | |
597 | return 0; | |
598 | ||
599 | error: | |
bd238fb4 LI |
600 | if (fid) |
601 | p9_client_clunk(fid); | |
6a3124a3 | 602 | |
6a3124a3 | 603 | return err; |
2bad8471 EVH |
604 | } |
605 | ||
606 | /** | |
607 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 608 | * @dir: inode that is being unlinked |
2bad8471 EVH |
609 | * @dentry: dentry that is being unlinked |
610 | * @mode: mode for new directory | |
611 | * | |
612 | */ | |
613 | ||
6a3124a3 | 614 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 615 | { |
6a3124a3 | 616 | int err; |
bd238fb4 | 617 | u32 perm; |
6a3124a3 | 618 | struct v9fs_session_info *v9ses; |
bd238fb4 | 619 | struct p9_fid *fid; |
6a3124a3 | 620 | |
bd238fb4 LI |
621 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
622 | err = 0; | |
6a3124a3 | 623 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 624 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
625 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
626 | if (IS_ERR(fid)) { | |
627 | err = PTR_ERR(fid); | |
628 | fid = NULL; | |
6a3124a3 LI |
629 | } |
630 | ||
bd238fb4 LI |
631 | if (fid) |
632 | p9_client_clunk(fid); | |
6a3124a3 | 633 | |
6a3124a3 | 634 | return err; |
2bad8471 EVH |
635 | } |
636 | ||
637 | /** | |
638 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
639 | * @dir: inode that is being walked from | |
640 | * @dentry: dentry that is being walked to? | |
641 | * @nameidata: path data | |
642 | * | |
643 | */ | |
644 | ||
645 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
646 | struct nameidata *nameidata) | |
647 | { | |
648 | struct super_block *sb; | |
649 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 650 | struct p9_fid *dfid, *fid; |
2bad8471 | 651 | struct inode *inode; |
bd238fb4 | 652 | char *name; |
2bad8471 EVH |
653 | int result = 0; |
654 | ||
bd238fb4 | 655 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 656 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
657 | |
658 | sb = dir->i_sb; | |
659 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
660 | dfid = v9fs_fid_lookup(dentry->d_parent); |
661 | if (IS_ERR(dfid)) | |
e231c2ee | 662 | return ERR_CAST(dfid); |
bd238fb4 LI |
663 | |
664 | name = (char *) dentry->d_name.name; | |
665 | fid = p9_client_walk(dfid, 1, &name, 1); | |
666 | if (IS_ERR(fid)) { | |
667 | result = PTR_ERR(fid); | |
2bad8471 EVH |
668 | if (result == -ENOENT) { |
669 | d_add(dentry, NULL); | |
2bad8471 EVH |
670 | return NULL; |
671 | } | |
2bad8471 | 672 | |
bd238fb4 | 673 | return ERR_PTR(result); |
2bad8471 EVH |
674 | } |
675 | ||
bd238fb4 LI |
676 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
677 | if (IS_ERR(inode)) { | |
678 | result = PTR_ERR(inode); | |
679 | inode = NULL; | |
680 | goto error; | |
2bad8471 EVH |
681 | } |
682 | ||
bd238fb4 | 683 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 684 | if (result < 0) |
bd238fb4 | 685 | goto error; |
6a3124a3 | 686 | |
ba17674f | 687 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
688 | dentry->d_op = &v9fs_cached_dentry_operations; |
689 | else | |
690 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
691 | |
692 | d_add(dentry, inode); | |
2bad8471 EVH |
693 | return NULL; |
694 | ||
bd238fb4 | 695 | error: |
62aa528e | 696 | p9_client_clunk(fid); |
da977b2c | 697 | |
2bad8471 EVH |
698 | return ERR_PTR(result); |
699 | } | |
700 | ||
701 | /** | |
702 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
703 | * @i: inode that is being unlinked | |
73c592b9 | 704 | * @d: dentry that is being unlinked |
2bad8471 EVH |
705 | * |
706 | */ | |
707 | ||
708 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
709 | { | |
710 | return v9fs_remove(i, d, 0); | |
711 | } | |
712 | ||
713 | /** | |
714 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
715 | * @i: inode that is being unlinked | |
73c592b9 | 716 | * @d: dentry that is being unlinked |
2bad8471 EVH |
717 | * |
718 | */ | |
719 | ||
720 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
721 | { | |
722 | return v9fs_remove(i, d, 1); | |
723 | } | |
724 | ||
725 | /** | |
726 | * v9fs_vfs_rename - VFS hook to rename an inode | |
727 | * @old_dir: old dir inode | |
728 | * @old_dentry: old dentry | |
729 | * @new_dir: new dir inode | |
730 | * @new_dentry: new dentry | |
731 | * | |
732 | */ | |
733 | ||
734 | static int | |
735 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
736 | struct inode *new_dir, struct dentry *new_dentry) | |
737 | { | |
bd238fb4 LI |
738 | struct inode *old_inode; |
739 | struct v9fs_session_info *v9ses; | |
740 | struct p9_fid *oldfid; | |
741 | struct p9_fid *olddirfid; | |
742 | struct p9_fid *newdirfid; | |
743 | struct p9_wstat wstat; | |
744 | int retval; | |
2bad8471 | 745 | |
bd238fb4 LI |
746 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
747 | retval = 0; | |
748 | old_inode = old_dentry->d_inode; | |
749 | v9ses = v9fs_inode2v9ses(old_inode); | |
750 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 751 | if (IS_ERR(oldfid)) |
da977b2c EVH |
752 | return PTR_ERR(oldfid); |
753 | ||
754 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 755 | if (IS_ERR(olddirfid)) { |
da977b2c | 756 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 757 | goto done; |
da977b2c EVH |
758 | } |
759 | ||
760 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 761 | if (IS_ERR(newdirfid)) { |
da977b2c | 762 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 763 | goto clunk_olddir; |
2bad8471 EVH |
764 | } |
765 | ||
766 | /* 9P can only handle file rename in the same directory */ | |
767 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
768 | P9_DPRINTK(P9_DEBUG_ERROR, |
769 | "old dir and new dir are different\n"); | |
621997cd | 770 | retval = -EXDEV; |
bd238fb4 | 771 | goto clunk_newdir; |
2bad8471 EVH |
772 | } |
773 | ||
531b1094 | 774 | v9fs_blank_wstat(&wstat); |
ba17674f | 775 | wstat.muid = v9ses->uname; |
531b1094 | 776 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 777 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 778 | |
bd238fb4 | 779 | clunk_newdir: |
22150c4f | 780 | p9_client_clunk(newdirfid); |
2bad8471 | 781 | |
bd238fb4 | 782 | clunk_olddir: |
22150c4f | 783 | p9_client_clunk(olddirfid); |
da977b2c | 784 | |
bd238fb4 | 785 | done: |
2bad8471 EVH |
786 | return retval; |
787 | } | |
788 | ||
789 | /** | |
943ffb58 | 790 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
791 | * @mnt: mount information |
792 | * @dentry: file to get attributes on | |
793 | * @stat: metadata structure to populate | |
2bad8471 EVH |
794 | * |
795 | */ | |
796 | ||
797 | static int | |
798 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
799 | struct kstat *stat) | |
800 | { | |
bd238fb4 LI |
801 | int err; |
802 | struct v9fs_session_info *v9ses; | |
803 | struct p9_fid *fid; | |
51a87c55 | 804 | struct p9_wstat *st; |
bd238fb4 LI |
805 | |
806 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
807 | err = -EPERM; | |
808 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 809 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
810 | return simple_getattr(mnt, dentry, stat); |
811 | ||
bd238fb4 LI |
812 | fid = v9fs_fid_lookup(dentry); |
813 | if (IS_ERR(fid)) | |
da977b2c | 814 | return PTR_ERR(fid); |
2bad8471 | 815 | |
bd238fb4 LI |
816 | st = p9_client_stat(fid); |
817 | if (IS_ERR(st)) | |
818 | return PTR_ERR(st); | |
2bad8471 | 819 | |
bd238fb4 | 820 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 821 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 822 | |
bd238fb4 LI |
823 | kfree(st); |
824 | return 0; | |
2bad8471 EVH |
825 | } |
826 | ||
827 | /** | |
828 | * v9fs_vfs_setattr - set file metadata | |
829 | * @dentry: file whose metadata to set | |
830 | * @iattr: metadata assignment structure | |
831 | * | |
832 | */ | |
833 | ||
834 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
835 | { | |
bd238fb4 LI |
836 | int retval; |
837 | struct v9fs_session_info *v9ses; | |
838 | struct p9_fid *fid; | |
839 | struct p9_wstat wstat; | |
2bad8471 | 840 | |
bd238fb4 LI |
841 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
842 | retval = -EPERM; | |
843 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
844 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
845 | if(IS_ERR(fid)) |
846 | return PTR_ERR(fid); | |
2bad8471 | 847 | |
531b1094 | 848 | v9fs_blank_wstat(&wstat); |
2bad8471 | 849 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 850 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
851 | |
852 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 853 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
854 | |
855 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 856 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
857 | |
858 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 859 | wstat.length = iattr->ia_size; |
2bad8471 | 860 | |
2405669b | 861 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
862 | if (iattr->ia_valid & ATTR_UID) |
863 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 864 | |
531b1094 LI |
865 | if (iattr->ia_valid & ATTR_GID) |
866 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
867 | } |
868 | ||
bd238fb4 LI |
869 | retval = p9_client_wstat(fid, &wstat); |
870 | if (retval >= 0) | |
871 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 872 | |
bd238fb4 | 873 | return retval; |
2bad8471 EVH |
874 | } |
875 | ||
876 | /** | |
531b1094 LI |
877 | * v9fs_stat2inode - populate an inode structure with mistat info |
878 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
879 | * @inode: inode to populate |
880 | * @sb: superblock of filesystem | |
881 | * | |
882 | */ | |
883 | ||
884 | void | |
51a87c55 | 885 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 886 | struct super_block *sb) |
2bad8471 | 887 | { |
531b1094 | 888 | char ext[32]; |
2bad8471 EVH |
889 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
890 | ||
891 | inode->i_nlink = 1; | |
892 | ||
531b1094 LI |
893 | inode->i_atime.tv_sec = stat->atime; |
894 | inode->i_mtime.tv_sec = stat->mtime; | |
895 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 896 | |
bd32b82d LI |
897 | inode->i_uid = v9ses->dfltuid; |
898 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 899 | |
2405669b | 900 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
901 | inode->i_uid = stat->n_uid; |
902 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
903 | } |
904 | ||
531b1094 | 905 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
906 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
907 | char type = 0; | |
908 | int major = -1; | |
909 | int minor = -1; | |
531b1094 | 910 | |
51a87c55 | 911 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 912 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
913 | switch (type) { |
914 | case 'c': | |
915 | inode->i_mode &= ~S_IFBLK; | |
916 | inode->i_mode |= S_IFCHR; | |
917 | break; | |
918 | case 'b': | |
919 | break; | |
920 | default: | |
bd238fb4 | 921 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
922 | "Unknown special type %c %s\n", type, |
923 | stat->extension); | |
2bad8471 EVH |
924 | }; |
925 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 926 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
927 | } else |
928 | inode->i_rdev = 0; | |
929 | ||
7549ae3e | 930 | i_size_write(inode, stat->length); |
2bad8471 | 931 | |
bd238fb4 | 932 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 933 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
934 | } |
935 | ||
936 | /** | |
937 | * v9fs_qid2ino - convert qid into inode number | |
938 | * @qid: qid to hash | |
939 | * | |
940 | * BUG: potential for inode number collisions? | |
941 | */ | |
942 | ||
bd238fb4 | 943 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
944 | { |
945 | u64 path = qid->path + 2; | |
946 | ino_t i = 0; | |
947 | ||
948 | if (sizeof(ino_t) == sizeof(path)) | |
949 | memcpy(&i, &path, sizeof(ino_t)); | |
950 | else | |
951 | i = (ino_t) (path ^ (path >> 32)); | |
952 | ||
953 | return i; | |
954 | } | |
955 | ||
2bad8471 EVH |
956 | /** |
957 | * v9fs_readlink - read a symlink's location (internal version) | |
958 | * @dentry: dentry for symlink | |
73c592b9 | 959 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
960 | * @buflen: length of buffer |
961 | * | |
962 | */ | |
963 | ||
964 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
965 | { | |
bd238fb4 | 966 | int retval; |
2bad8471 | 967 | |
bd238fb4 LI |
968 | struct v9fs_session_info *v9ses; |
969 | struct p9_fid *fid; | |
51a87c55 | 970 | struct p9_wstat *st; |
2bad8471 | 971 | |
bd238fb4 LI |
972 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
973 | retval = -EPERM; | |
974 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
975 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 976 | if (IS_ERR(fid)) |
da977b2c | 977 | return PTR_ERR(fid); |
2bad8471 | 978 | |
2405669b | 979 | if (!v9fs_extended(v9ses)) |
bd238fb4 | 980 | return -EBADF; |
2bad8471 | 981 | |
bd238fb4 LI |
982 | st = p9_client_stat(fid); |
983 | if (IS_ERR(st)) | |
984 | return PTR_ERR(st); | |
2bad8471 | 985 | |
bd238fb4 | 986 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 987 | retval = -EINVAL; |
bd238fb4 | 988 | goto done; |
2bad8471 EVH |
989 | } |
990 | ||
991 | /* copy extension buffer into buffer */ | |
51a87c55 | 992 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 993 | |
bd238fb4 | 994 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 995 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 996 | |
2511cd0b | 997 | retval = strnlen(buffer, buflen); |
bd238fb4 LI |
998 | done: |
999 | kfree(st); | |
2bad8471 EVH |
1000 | return retval; |
1001 | } | |
1002 | ||
1003 | /** | |
1004 | * v9fs_vfs_readlink - read a symlink's location | |
1005 | * @dentry: dentry for symlink | |
ee443996 | 1006 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1007 | * @buflen: length of buffer |
1008 | * | |
1009 | */ | |
1010 | ||
1011 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1012 | int buflen) | |
1013 | { | |
1014 | int retval; | |
1015 | int ret; | |
1016 | char *link = __getname(); | |
1017 | ||
0710d36a FM |
1018 | if (unlikely(!link)) |
1019 | return -ENOMEM; | |
1020 | ||
a1f9d8d2 LI |
1021 | if (buflen > PATH_MAX) |
1022 | buflen = PATH_MAX; | |
2bad8471 | 1023 | |
7dd0cdc5 WF |
1024 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name, |
1025 | dentry); | |
2bad8471 EVH |
1026 | |
1027 | retval = v9fs_readlink(dentry, link, buflen); | |
1028 | ||
1029 | if (retval > 0) { | |
1030 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
bd238fb4 LI |
1031 | P9_DPRINTK(P9_DEBUG_ERROR, |
1032 | "problem copying to user: %d\n", ret); | |
2bad8471 EVH |
1033 | retval = ret; |
1034 | } | |
1035 | } | |
1036 | ||
ce44eeb6 | 1037 | __putname(link); |
2bad8471 EVH |
1038 | return retval; |
1039 | } | |
1040 | ||
1041 | /** | |
1042 | * v9fs_vfs_follow_link - follow a symlink path | |
1043 | * @dentry: dentry for symlink | |
1044 | * @nd: nameidata | |
1045 | * | |
1046 | */ | |
1047 | ||
1048 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1049 | { | |
1050 | int len = 0; | |
1051 | char *link = __getname(); | |
1052 | ||
bd238fb4 | 1053 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1054 | |
1055 | if (!link) | |
1056 | link = ERR_PTR(-ENOMEM); | |
1057 | else { | |
16cce6d2 | 1058 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1059 | |
1060 | if (len < 0) { | |
ce44eeb6 | 1061 | __putname(link); |
2bad8471 EVH |
1062 | link = ERR_PTR(len); |
1063 | } else | |
2511cd0b | 1064 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1065 | } |
1066 | nd_set_link(nd, link); | |
1067 | ||
1068 | return NULL; | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * v9fs_vfs_put_link - release a symlink path | |
1073 | * @dentry: dentry for symlink | |
1074 | * @nd: nameidata | |
ee443996 | 1075 | * @p: unused |
2bad8471 EVH |
1076 | * |
1077 | */ | |
1078 | ||
ee443996 EVH |
1079 | static void |
1080 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1081 | { |
1082 | char *s = nd_get_link(nd); | |
1083 | ||
6ff23207 DG |
1084 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1085 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1086 | if (!IS_ERR(s)) |
ce44eeb6 | 1087 | __putname(s); |
2bad8471 EVH |
1088 | } |
1089 | ||
ee443996 EVH |
1090 | /** |
1091 | * v9fs_vfs_mkspecial - create a special file | |
1092 | * @dir: inode to create special file in | |
1093 | * @dentry: dentry to create | |
1094 | * @mode: mode to create special file | |
1095 | * @extension: 9p2000.u format extension string representing special file | |
1096 | * | |
1097 | */ | |
1098 | ||
531b1094 LI |
1099 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1100 | int mode, const char *extension) | |
2bad8471 | 1101 | { |
bd238fb4 | 1102 | u32 perm; |
531b1094 | 1103 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1104 | struct p9_fid *fid; |
2bad8471 | 1105 | |
6a3124a3 | 1106 | v9ses = v9fs_inode2v9ses(dir); |
2405669b | 1107 | if (!v9fs_extended(v9ses)) { |
bd238fb4 | 1108 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1109 | return -EPERM; |
2bad8471 EVH |
1110 | } |
1111 | ||
da977b2c | 1112 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1113 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1114 | P9_OREAD); | |
1115 | if (IS_ERR(fid)) | |
1116 | return PTR_ERR(fid); | |
da977b2c | 1117 | |
bd238fb4 | 1118 | p9_client_clunk(fid); |
6a3124a3 | 1119 | return 0; |
531b1094 LI |
1120 | } |
1121 | ||
1122 | /** | |
1123 | * v9fs_vfs_symlink - helper function to create symlinks | |
1124 | * @dir: directory inode containing symlink | |
1125 | * @dentry: dentry for symlink | |
1126 | * @symname: symlink data | |
1127 | * | |
ee443996 | 1128 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1129 | * |
1130 | */ | |
1131 | ||
1132 | static int | |
1133 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1134 | { | |
bd238fb4 LI |
1135 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1136 | dentry->d_name.name, symname); | |
531b1094 LI |
1137 | |
1138 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * v9fs_vfs_link - create a hardlink | |
1143 | * @old_dentry: dentry for file to link to | |
1144 | * @dir: inode destination for new link | |
1145 | * @dentry: dentry for link | |
1146 | * | |
1147 | */ | |
1148 | ||
531b1094 LI |
1149 | static int |
1150 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1151 | struct dentry *dentry) | |
1152 | { | |
1153 | int retval; | |
bd238fb4 | 1154 | struct p9_fid *oldfid; |
531b1094 LI |
1155 | char *name; |
1156 | ||
bd238fb4 LI |
1157 | P9_DPRINTK(P9_DEBUG_VFS, |
1158 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1159 | old_dentry->d_name.name); |
1160 | ||
da977b2c | 1161 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1162 | if (IS_ERR(oldfid)) |
da977b2c | 1163 | return PTR_ERR(oldfid); |
531b1094 LI |
1164 | |
1165 | name = __getname(); | |
da977b2c EVH |
1166 | if (unlikely(!name)) { |
1167 | retval = -ENOMEM; | |
1168 | goto clunk_fid; | |
1169 | } | |
0710d36a | 1170 | |
16cce6d2 | 1171 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1172 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1173 | __putname(name); |
2bad8471 | 1174 | |
da977b2c | 1175 | clunk_fid: |
bd238fb4 | 1176 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1177 | return retval; |
1178 | } | |
1179 | ||
1180 | /** | |
1181 | * v9fs_vfs_mknod - create a special file | |
1182 | * @dir: inode destination for new link | |
1183 | * @dentry: dentry for file | |
1184 | * @mode: mode for creation | |
ee443996 | 1185 | * @rdev: device associated with special file |
2bad8471 EVH |
1186 | * |
1187 | */ | |
1188 | ||
1189 | static int | |
1190 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1191 | { | |
531b1094 LI |
1192 | int retval; |
1193 | char *name; | |
2bad8471 | 1194 | |
bd238fb4 LI |
1195 | P9_DPRINTK(P9_DEBUG_VFS, |
1196 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1197 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1198 | ||
531b1094 LI |
1199 | if (!new_valid_dev(rdev)) |
1200 | return -EINVAL; | |
2bad8471 | 1201 | |
531b1094 | 1202 | name = __getname(); |
c0291a05 ET |
1203 | if (!name) |
1204 | return -ENOMEM; | |
2bad8471 EVH |
1205 | /* build extension */ |
1206 | if (S_ISBLK(mode)) | |
531b1094 | 1207 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1208 | else if (S_ISCHR(mode)) |
531b1094 | 1209 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1210 | else if (S_ISFIFO(mode)) |
531b1094 | 1211 | *name = 0; |
2bad8471 | 1212 | else { |
531b1094 LI |
1213 | __putname(name); |
1214 | return -EINVAL; | |
2bad8471 EVH |
1215 | } |
1216 | ||
531b1094 LI |
1217 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1218 | __putname(name); | |
2bad8471 EVH |
1219 | |
1220 | return retval; | |
1221 | } | |
1222 | ||
754661f1 | 1223 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1224 | .create = v9fs_vfs_create, |
1225 | .lookup = v9fs_vfs_lookup, | |
1226 | .symlink = v9fs_vfs_symlink, | |
1227 | .link = v9fs_vfs_link, | |
1228 | .unlink = v9fs_vfs_unlink, | |
1229 | .mkdir = v9fs_vfs_mkdir, | |
1230 | .rmdir = v9fs_vfs_rmdir, | |
1231 | .mknod = v9fs_vfs_mknod, | |
1232 | .rename = v9fs_vfs_rename, | |
1233 | .readlink = v9fs_vfs_readlink, | |
1234 | .getattr = v9fs_vfs_getattr, | |
1235 | .setattr = v9fs_vfs_setattr, | |
1236 | }; | |
1237 | ||
754661f1 | 1238 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1239 | .create = v9fs_vfs_create, |
1240 | .lookup = v9fs_vfs_lookup, | |
1241 | .unlink = v9fs_vfs_unlink, | |
1242 | .mkdir = v9fs_vfs_mkdir, | |
1243 | .rmdir = v9fs_vfs_rmdir, | |
1244 | .mknod = v9fs_vfs_mknod, | |
1245 | .rename = v9fs_vfs_rename, | |
1246 | .getattr = v9fs_vfs_getattr, | |
1247 | .setattr = v9fs_vfs_setattr, | |
1248 | }; | |
1249 | ||
754661f1 | 1250 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1251 | .getattr = v9fs_vfs_getattr, |
1252 | .setattr = v9fs_vfs_setattr, | |
1253 | }; | |
1254 | ||
754661f1 | 1255 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1256 | .readlink = v9fs_vfs_readlink, |
1257 | .follow_link = v9fs_vfs_follow_link, | |
1258 | .put_link = v9fs_vfs_put_link, | |
1259 | .getattr = v9fs_vfs_getattr, | |
1260 | .setattr = v9fs_vfs_setattr, | |
1261 | }; |