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 EVH |
42 | #include "fid.h" |
43 | ||
754661f1 AV |
44 | static const struct inode_operations v9fs_dir_inode_operations; |
45 | static const struct inode_operations v9fs_dir_inode_operations_ext; | |
46 | static const struct inode_operations v9fs_file_inode_operations; | |
47 | static const struct inode_operations v9fs_symlink_inode_operations; | |
2bad8471 EVH |
48 | |
49 | /** | |
50 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
51 | * @v9ses: v9fs session information | |
52 | * @mode: mode to convert | |
53 | * | |
54 | */ | |
55 | ||
73c592b9 | 56 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
57 | { |
58 | int res; | |
59 | res = mode & 0777; | |
60 | if (S_ISDIR(mode)) | |
bd238fb4 | 61 | res |= P9_DMDIR; |
2405669b | 62 | if (v9fs_extended(v9ses)) { |
2bad8471 | 63 | if (S_ISLNK(mode)) |
bd238fb4 | 64 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
65 | if (v9ses->nodev == 0) { |
66 | if (S_ISSOCK(mode)) | |
bd238fb4 | 67 | res |= P9_DMSOCKET; |
2bad8471 | 68 | if (S_ISFIFO(mode)) |
bd238fb4 | 69 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 70 | if (S_ISBLK(mode)) |
bd238fb4 | 71 | res |= P9_DMDEVICE; |
2bad8471 | 72 | if (S_ISCHR(mode)) |
bd238fb4 | 73 | res |= P9_DMDEVICE; |
2bad8471 EVH |
74 | } |
75 | ||
76 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 77 | res |= P9_DMSETUID; |
2bad8471 | 78 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 79 | res |= P9_DMSETGID; |
d199d652 AL |
80 | if ((mode & S_ISVTX) == S_ISVTX) |
81 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
82 | if ((mode & P9_DMLINK)) |
83 | res |= P9_DMLINK; | |
2bad8471 EVH |
84 | } |
85 | ||
86 | return res; | |
87 | } | |
88 | ||
89 | /** | |
90 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
91 | * @v9ses: v9fs session information | |
92 | * @mode: mode to convert | |
93 | * | |
94 | */ | |
95 | ||
73c592b9 | 96 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
97 | { |
98 | int res; | |
99 | ||
100 | res = mode & 0777; | |
101 | ||
bd238fb4 | 102 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 103 | res |= S_IFDIR; |
2405669b | 104 | else if ((mode & P9_DMSYMLINK) && (v9fs_extended(v9ses))) |
2bad8471 | 105 | res |= S_IFLNK; |
2405669b | 106 | else if ((mode & P9_DMSOCKET) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
107 | && (v9ses->nodev == 0)) |
108 | res |= S_IFSOCK; | |
2405669b | 109 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
110 | && (v9ses->nodev == 0)) |
111 | res |= S_IFIFO; | |
2405669b | 112 | else if ((mode & P9_DMDEVICE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
113 | && (v9ses->nodev == 0)) |
114 | res |= S_IFBLK; | |
115 | else | |
116 | res |= S_IFREG; | |
117 | ||
2405669b | 118 | if (v9fs_extended(v9ses)) { |
bd238fb4 | 119 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
120 | res |= S_ISUID; |
121 | ||
bd238fb4 | 122 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 123 | res |= S_ISGID; |
d199d652 AL |
124 | |
125 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
126 | res |= S_ISVTX; | |
2bad8471 EVH |
127 | } |
128 | ||
129 | return res; | |
130 | } | |
131 | ||
ee443996 EVH |
132 | /** |
133 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
134 | * @uflags: flags to convert | |
135 | * | |
136 | */ | |
137 | ||
6a3124a3 LI |
138 | int v9fs_uflags2omode(int uflags) |
139 | { | |
140 | int ret; | |
141 | ||
142 | ret = 0; | |
143 | switch (uflags&3) { | |
144 | default: | |
145 | case O_RDONLY: | |
bd238fb4 | 146 | ret = P9_OREAD; |
6a3124a3 LI |
147 | break; |
148 | ||
149 | case O_WRONLY: | |
bd238fb4 | 150 | ret = P9_OWRITE; |
6a3124a3 LI |
151 | break; |
152 | ||
153 | case O_RDWR: | |
bd238fb4 | 154 | ret = P9_ORDWR; |
6a3124a3 LI |
155 | break; |
156 | } | |
157 | ||
158 | if (uflags & O_EXCL) | |
bd238fb4 | 159 | ret |= P9_OEXCL; |
6a3124a3 LI |
160 | |
161 | if (uflags & O_TRUNC) | |
bd238fb4 | 162 | ret |= P9_OTRUNC; |
6a3124a3 LI |
163 | |
164 | if (uflags & O_APPEND) | |
bd238fb4 | 165 | ret |= P9_OAPPEND; |
6a3124a3 LI |
166 | |
167 | return ret; | |
168 | } | |
169 | ||
2bad8471 | 170 | /** |
531b1094 | 171 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
2bad8471 | 172 | * @v9ses: 9P session info (for determining extended mode) |
531b1094 | 173 | * @wstat: structure to initialize |
2bad8471 EVH |
174 | * |
175 | */ | |
176 | ||
73c592b9 | 177 | static void |
bd238fb4 | 178 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 179 | { |
531b1094 LI |
180 | wstat->type = ~0; |
181 | wstat->dev = ~0; | |
182 | wstat->qid.type = ~0; | |
183 | wstat->qid.version = ~0; | |
184 | *((long long *)&wstat->qid.path) = ~0; | |
185 | wstat->mode = ~0; | |
186 | wstat->atime = ~0; | |
187 | wstat->mtime = ~0; | |
188 | wstat->length = ~0; | |
189 | wstat->name = NULL; | |
190 | wstat->uid = NULL; | |
191 | wstat->gid = NULL; | |
192 | wstat->muid = NULL; | |
193 | wstat->n_uid = ~0; | |
194 | wstat->n_gid = ~0; | |
195 | wstat->n_muid = ~0; | |
196 | wstat->extension = NULL; | |
2bad8471 EVH |
197 | } |
198 | ||
199 | /** | |
200 | * v9fs_get_inode - helper function to setup an inode | |
201 | * @sb: superblock | |
202 | * @mode: mode to setup inode with | |
203 | * | |
204 | */ | |
205 | ||
206 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
207 | { | |
6a3124a3 | 208 | struct inode *inode; |
b501611a | 209 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 210 | |
bd238fb4 | 211 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
212 | |
213 | inode = new_inode(sb); | |
214 | if (inode) { | |
215 | inode->i_mode = mode; | |
216 | inode->i_uid = current->fsuid; | |
217 | inode->i_gid = current->fsgid; | |
2bad8471 EVH |
218 | inode->i_blocks = 0; |
219 | inode->i_rdev = 0; | |
220 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
147b31cf | 221 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
2bad8471 EVH |
222 | |
223 | switch (mode & S_IFMT) { | |
224 | case S_IFIFO: | |
225 | case S_IFBLK: | |
226 | case S_IFCHR: | |
227 | case S_IFSOCK: | |
2405669b | 228 | if (!v9fs_extended(v9ses)) { |
bd238fb4 LI |
229 | P9_DPRINTK(P9_DEBUG_ERROR, |
230 | "special files without extended mode\n"); | |
b501611a EVH |
231 | return ERR_PTR(-EINVAL); |
232 | } | |
5d58bec5 EVH |
233 | init_special_inode(inode, inode->i_mode, |
234 | inode->i_rdev); | |
235 | break; | |
2bad8471 EVH |
236 | case S_IFREG: |
237 | inode->i_op = &v9fs_file_inode_operations; | |
238 | inode->i_fop = &v9fs_file_operations; | |
239 | break; | |
b501611a | 240 | case S_IFLNK: |
2405669b | 241 | if (!v9fs_extended(v9ses)) { |
bd238fb4 LI |
242 | P9_DPRINTK(P9_DEBUG_ERROR, |
243 | "extended modes used w/o 9P2000.u\n"); | |
b501611a EVH |
244 | return ERR_PTR(-EINVAL); |
245 | } | |
246 | inode->i_op = &v9fs_symlink_inode_operations; | |
247 | break; | |
2bad8471 | 248 | case S_IFDIR: |
d8c76e6f | 249 | inc_nlink(inode); |
2405669b | 250 | if (v9fs_extended(v9ses)) |
b501611a EVH |
251 | inode->i_op = &v9fs_dir_inode_operations_ext; |
252 | else | |
253 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
254 | inode->i_fop = &v9fs_dir_operations; |
255 | break; | |
2bad8471 | 256 | default: |
bd238fb4 LI |
257 | P9_DPRINTK(P9_DEBUG_ERROR, |
258 | "BAD mode 0x%x S_IFMT 0x%x\n", | |
2bad8471 EVH |
259 | mode, mode & S_IFMT); |
260 | return ERR_PTR(-EINVAL); | |
261 | } | |
262 | } else { | |
bd238fb4 | 263 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); |
2bad8471 EVH |
264 | return ERR_PTR(-ENOMEM); |
265 | } | |
266 | return inode; | |
267 | } | |
268 | ||
bd238fb4 | 269 | /* |
6a3124a3 LI |
270 | static struct v9fs_fid* |
271 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
272 | { | |
273 | int err; | |
736c4b85 | 274 | int nfid; |
6a3124a3 LI |
275 | struct v9fs_fid *ret; |
276 | struct v9fs_fcall *fcall; | |
277 | ||
278 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
279 | if (nfid < 0) { | |
0b8dd177 | 280 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 281 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
282 | } |
283 | ||
6a3124a3 LI |
284 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
285 | &fcall); | |
286 | ||
287 | if (err < 0) { | |
41e5a6ac LI |
288 | if (fcall && fcall->id == RWALK) |
289 | goto clunk_fid; | |
290 | ||
6a3124a3 LI |
291 | PRINT_FCALL_ERROR("walk error", fcall); |
292 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
293 | goto error; | |
0b8dd177 | 294 | } |
6a3124a3 | 295 | |
3cf6429a LI |
296 | kfree(fcall); |
297 | fcall = NULL; | |
6a3124a3 LI |
298 | ret = v9fs_fid_create(v9ses, nfid); |
299 | if (!ret) { | |
300 | err = -ENOMEM; | |
301 | goto clunk_fid; | |
302 | } | |
0b8dd177 | 303 | |
6a3124a3 LI |
304 | err = v9fs_fid_insert(ret, dentry); |
305 | if (err < 0) { | |
306 | v9fs_fid_destroy(ret); | |
307 | goto clunk_fid; | |
0b8dd177 | 308 | } |
2bad8471 | 309 | |
6a3124a3 | 310 | return ret; |
2bad8471 | 311 | |
6a3124a3 LI |
312 | clunk_fid: |
313 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 314 | |
6a3124a3 LI |
315 | error: |
316 | kfree(fcall); | |
317 | return ERR_PTR(err); | |
318 | } | |
bd238fb4 | 319 | */ |
2bad8471 | 320 | |
ee443996 EVH |
321 | /** |
322 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
323 | * @v9ses: session information | |
324 | * @fid: fid to issue attribute request for | |
325 | * @sb: superblock on which to create inode | |
326 | * | |
327 | */ | |
328 | ||
5174fdab | 329 | static struct inode * |
bd238fb4 | 330 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
331 | struct super_block *sb) |
332 | { | |
333 | int err, umode; | |
334 | struct inode *ret; | |
bd238fb4 | 335 | struct p9_stat *st; |
531b1094 | 336 | |
6a3124a3 | 337 | ret = NULL; |
bd238fb4 LI |
338 | st = p9_client_stat(fid); |
339 | if (IS_ERR(st)) { | |
340 | err = PTR_ERR(st); | |
341 | st = NULL; | |
6a3124a3 | 342 | goto error; |
2bad8471 EVH |
343 | } |
344 | ||
bd238fb4 | 345 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
346 | ret = v9fs_get_inode(sb, umode); |
347 | if (IS_ERR(ret)) { | |
348 | err = PTR_ERR(ret); | |
349 | ret = NULL; | |
350 | goto error; | |
351 | } | |
2bad8471 | 352 | |
bd238fb4 LI |
353 | v9fs_stat2inode(st, ret, sb); |
354 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
355 | kfree(st); | |
6a3124a3 | 356 | return ret; |
2bad8471 | 357 | |
6a3124a3 | 358 | error: |
bd238fb4 | 359 | kfree(st); |
6a3124a3 LI |
360 | if (ret) |
361 | iput(ret); | |
2bad8471 | 362 | |
6a3124a3 | 363 | return ERR_PTR(err); |
2bad8471 EVH |
364 | } |
365 | ||
366 | /** | |
367 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
368 | * @dir: directory inode that is being deleted |
369 | * @file: dentry that is being deleted | |
370 | * @rmdir: removing a directory | |
2bad8471 EVH |
371 | * |
372 | */ | |
373 | ||
374 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
375 | { | |
bd238fb4 LI |
376 | struct inode *file_inode; |
377 | struct v9fs_session_info *v9ses; | |
378 | struct p9_fid *v9fid; | |
2bad8471 | 379 | |
bd238fb4 | 380 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
381 | rmdir); |
382 | ||
383 | file_inode = file->d_inode; | |
2bad8471 | 384 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 385 | v9fid = v9fs_fid_clone(file); |
ba17674f | 386 | if (IS_ERR(v9fid)) |
da977b2c | 387 | return PTR_ERR(v9fid); |
2bad8471 | 388 | |
bd238fb4 | 389 | return p9_client_remove(v9fid); |
2bad8471 EVH |
390 | } |
391 | ||
6a3124a3 LI |
392 | static int |
393 | v9fs_open_created(struct inode *inode, struct file *file) | |
394 | { | |
395 | return 0; | |
396 | } | |
397 | ||
bd238fb4 | 398 | |
2bad8471 | 399 | /** |
bd238fb4 | 400 | * v9fs_create - Create a file |
ee443996 EVH |
401 | * @v9ses: session information |
402 | * @dir: directory that dentry is being created in | |
bd238fb4 LI |
403 | * @dentry: dentry that is being created |
404 | * @perm: create permissions | |
405 | * @mode: open mode | |
ee443996 | 406 | * @extension: 9p2000.u extension string to support devices, etc. |
2bad8471 EVH |
407 | * |
408 | */ | |
bd238fb4 LI |
409 | static struct p9_fid * |
410 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
411 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 412 | { |
6a3124a3 | 413 | int err; |
bd238fb4 LI |
414 | char *name; |
415 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 416 | struct inode *inode; |
6a3124a3 | 417 | |
bd238fb4 LI |
418 | err = 0; |
419 | ofid = NULL; | |
420 | fid = NULL; | |
421 | name = (char *) dentry->d_name.name; | |
da977b2c | 422 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 423 | if (IS_ERR(dfid)) { |
da977b2c | 424 | err = PTR_ERR(dfid); |
bd238fb4 | 425 | dfid = NULL; |
da977b2c EVH |
426 | goto error; |
427 | } | |
6a3124a3 | 428 | |
bd238fb4 LI |
429 | /* clone a fid to use for creation */ |
430 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
431 | if (IS_ERR(ofid)) { | |
432 | err = PTR_ERR(ofid); | |
433 | ofid = NULL; | |
434 | goto error; | |
435 | } | |
6a3124a3 | 436 | |
bd238fb4 LI |
437 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
438 | if (err < 0) | |
439 | goto error; | |
6a3124a3 | 440 | |
bd238fb4 LI |
441 | /* now walk from the parent so we can get unopened fid */ |
442 | fid = p9_client_walk(dfid, 1, &name, 0); | |
443 | if (IS_ERR(fid)) { | |
444 | err = PTR_ERR(fid); | |
445 | fid = NULL; | |
6a3124a3 | 446 | goto error; |
bd238fb4 LI |
447 | } else |
448 | dfid = NULL; | |
6a3124a3 | 449 | |
bd238fb4 LI |
450 | /* instantiate inode and assign the unopened fid to the dentry */ |
451 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
452 | if (IS_ERR(inode)) { |
453 | err = PTR_ERR(inode); | |
6a3124a3 LI |
454 | goto error; |
455 | } | |
456 | ||
ba17674f | 457 | if (v9ses->cache) |
e03abc0c EVH |
458 | dentry->d_op = &v9fs_cached_dentry_operations; |
459 | else | |
460 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 461 | |
6a3124a3 | 462 | d_instantiate(dentry, inode); |
bd238fb4 LI |
463 | v9fs_fid_add(dentry, fid); |
464 | return ofid; | |
6a3124a3 | 465 | |
bd238fb4 LI |
466 | error: |
467 | if (dfid) | |
468 | p9_client_clunk(dfid); | |
469 | ||
470 | if (ofid) | |
471 | p9_client_clunk(ofid); | |
472 | ||
473 | if (fid) | |
474 | p9_client_clunk(fid); | |
475 | ||
476 | return ERR_PTR(err); | |
477 | } | |
478 | ||
479 | /** | |
480 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 481 | * @dir: directory inode that is being created |
bd238fb4 LI |
482 | * @dentry: dentry that is being deleted |
483 | * @mode: create permissions | |
484 | * @nd: path information | |
485 | * | |
486 | */ | |
6a3124a3 | 487 | |
bd238fb4 LI |
488 | static int |
489 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
490 | struct nameidata *nd) | |
491 | { | |
492 | int err; | |
493 | u32 perm; | |
494 | int flags; | |
495 | struct v9fs_session_info *v9ses; | |
496 | struct p9_fid *fid; | |
497 | struct file *filp; | |
498 | ||
499 | err = 0; | |
500 | fid = NULL; | |
501 | v9ses = v9fs_inode2v9ses(dir); | |
502 | perm = unixmode2p9mode(v9ses, mode); | |
503 | if (nd && nd->flags & LOOKUP_OPEN) | |
504 | flags = nd->intent.open.flags - 1; | |
505 | else | |
506 | flags = O_RDWR; | |
507 | ||
508 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
509 | v9fs_uflags2omode(flags)); | |
510 | if (IS_ERR(fid)) { | |
511 | err = PTR_ERR(fid); | |
512 | fid = NULL; | |
513 | goto error; | |
514 | } | |
515 | ||
516 | /* if we are opening a file, assign the open fid to the file */ | |
517 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
518 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
519 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
520 | err = PTR_ERR(filp); |
521 | goto error; | |
6a3124a3 LI |
522 | } |
523 | ||
bd238fb4 LI |
524 | filp->private_data = fid; |
525 | } else | |
526 | p9_client_clunk(fid); | |
6a3124a3 LI |
527 | |
528 | return 0; | |
529 | ||
530 | error: | |
bd238fb4 LI |
531 | if (fid) |
532 | p9_client_clunk(fid); | |
6a3124a3 | 533 | |
6a3124a3 | 534 | return err; |
2bad8471 EVH |
535 | } |
536 | ||
537 | /** | |
538 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 539 | * @dir: inode that is being unlinked |
2bad8471 EVH |
540 | * @dentry: dentry that is being unlinked |
541 | * @mode: mode for new directory | |
542 | * | |
543 | */ | |
544 | ||
6a3124a3 | 545 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 546 | { |
6a3124a3 | 547 | int err; |
bd238fb4 | 548 | u32 perm; |
6a3124a3 | 549 | struct v9fs_session_info *v9ses; |
bd238fb4 | 550 | struct p9_fid *fid; |
6a3124a3 | 551 | |
bd238fb4 LI |
552 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
553 | err = 0; | |
6a3124a3 | 554 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 555 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
556 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
557 | if (IS_ERR(fid)) { | |
558 | err = PTR_ERR(fid); | |
559 | fid = NULL; | |
6a3124a3 LI |
560 | } |
561 | ||
bd238fb4 LI |
562 | if (fid) |
563 | p9_client_clunk(fid); | |
6a3124a3 | 564 | |
6a3124a3 | 565 | return err; |
2bad8471 EVH |
566 | } |
567 | ||
568 | /** | |
569 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
570 | * @dir: inode that is being walked from | |
571 | * @dentry: dentry that is being walked to? | |
572 | * @nameidata: path data | |
573 | * | |
574 | */ | |
575 | ||
576 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
577 | struct nameidata *nameidata) | |
578 | { | |
579 | struct super_block *sb; | |
580 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 581 | struct p9_fid *dfid, *fid; |
2bad8471 | 582 | struct inode *inode; |
bd238fb4 | 583 | char *name; |
2bad8471 EVH |
584 | int result = 0; |
585 | ||
bd238fb4 | 586 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 587 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
588 | |
589 | sb = dir->i_sb; | |
590 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
591 | dfid = v9fs_fid_lookup(dentry->d_parent); |
592 | if (IS_ERR(dfid)) | |
e231c2ee | 593 | return ERR_CAST(dfid); |
bd238fb4 LI |
594 | |
595 | name = (char *) dentry->d_name.name; | |
596 | fid = p9_client_walk(dfid, 1, &name, 1); | |
597 | if (IS_ERR(fid)) { | |
598 | result = PTR_ERR(fid); | |
2bad8471 EVH |
599 | if (result == -ENOENT) { |
600 | d_add(dentry, NULL); | |
2bad8471 EVH |
601 | return NULL; |
602 | } | |
2bad8471 | 603 | |
bd238fb4 | 604 | return ERR_PTR(result); |
2bad8471 EVH |
605 | } |
606 | ||
bd238fb4 LI |
607 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
608 | if (IS_ERR(inode)) { | |
609 | result = PTR_ERR(inode); | |
610 | inode = NULL; | |
611 | goto error; | |
2bad8471 EVH |
612 | } |
613 | ||
bd238fb4 | 614 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 615 | if (result < 0) |
bd238fb4 | 616 | goto error; |
6a3124a3 | 617 | |
ba17674f | 618 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
619 | dentry->d_op = &v9fs_cached_dentry_operations; |
620 | else | |
621 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
622 | |
623 | d_add(dentry, inode); | |
2bad8471 EVH |
624 | return NULL; |
625 | ||
bd238fb4 LI |
626 | error: |
627 | if (fid) | |
628 | p9_client_clunk(fid); | |
da977b2c | 629 | |
2bad8471 EVH |
630 | return ERR_PTR(result); |
631 | } | |
632 | ||
633 | /** | |
634 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
635 | * @i: inode that is being unlinked | |
73c592b9 | 636 | * @d: dentry that is being unlinked |
2bad8471 EVH |
637 | * |
638 | */ | |
639 | ||
640 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
641 | { | |
642 | return v9fs_remove(i, d, 0); | |
643 | } | |
644 | ||
645 | /** | |
646 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
647 | * @i: inode that is being unlinked | |
73c592b9 | 648 | * @d: dentry that is being unlinked |
2bad8471 EVH |
649 | * |
650 | */ | |
651 | ||
652 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
653 | { | |
654 | return v9fs_remove(i, d, 1); | |
655 | } | |
656 | ||
657 | /** | |
658 | * v9fs_vfs_rename - VFS hook to rename an inode | |
659 | * @old_dir: old dir inode | |
660 | * @old_dentry: old dentry | |
661 | * @new_dir: new dir inode | |
662 | * @new_dentry: new dentry | |
663 | * | |
664 | */ | |
665 | ||
666 | static int | |
667 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
668 | struct inode *new_dir, struct dentry *new_dentry) | |
669 | { | |
bd238fb4 LI |
670 | struct inode *old_inode; |
671 | struct v9fs_session_info *v9ses; | |
672 | struct p9_fid *oldfid; | |
673 | struct p9_fid *olddirfid; | |
674 | struct p9_fid *newdirfid; | |
675 | struct p9_wstat wstat; | |
676 | int retval; | |
2bad8471 | 677 | |
bd238fb4 LI |
678 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
679 | retval = 0; | |
680 | old_inode = old_dentry->d_inode; | |
681 | v9ses = v9fs_inode2v9ses(old_inode); | |
682 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 683 | if (IS_ERR(oldfid)) |
da977b2c EVH |
684 | return PTR_ERR(oldfid); |
685 | ||
686 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 687 | if (IS_ERR(olddirfid)) { |
da977b2c | 688 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 689 | goto done; |
da977b2c EVH |
690 | } |
691 | ||
692 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 693 | if (IS_ERR(newdirfid)) { |
da977b2c | 694 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 695 | goto clunk_olddir; |
2bad8471 EVH |
696 | } |
697 | ||
698 | /* 9P can only handle file rename in the same directory */ | |
699 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
700 | P9_DPRINTK(P9_DEBUG_ERROR, |
701 | "old dir and new dir are different\n"); | |
621997cd | 702 | retval = -EXDEV; |
bd238fb4 | 703 | goto clunk_newdir; |
2bad8471 EVH |
704 | } |
705 | ||
531b1094 | 706 | v9fs_blank_wstat(&wstat); |
ba17674f | 707 | wstat.muid = v9ses->uname; |
531b1094 | 708 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 709 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 710 | |
bd238fb4 | 711 | clunk_newdir: |
22150c4f | 712 | p9_client_clunk(newdirfid); |
2bad8471 | 713 | |
bd238fb4 | 714 | clunk_olddir: |
22150c4f | 715 | p9_client_clunk(olddirfid); |
da977b2c | 716 | |
bd238fb4 | 717 | done: |
2bad8471 EVH |
718 | return retval; |
719 | } | |
720 | ||
721 | /** | |
943ffb58 | 722 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
723 | * @mnt: mount information |
724 | * @dentry: file to get attributes on | |
725 | * @stat: metadata structure to populate | |
2bad8471 EVH |
726 | * |
727 | */ | |
728 | ||
729 | static int | |
730 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
731 | struct kstat *stat) | |
732 | { | |
bd238fb4 LI |
733 | int err; |
734 | struct v9fs_session_info *v9ses; | |
735 | struct p9_fid *fid; | |
736 | struct p9_stat *st; | |
737 | ||
738 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
739 | err = -EPERM; | |
740 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
9523a841 EVH |
741 | if (v9ses->cache == CACHE_LOOSE) |
742 | return simple_getattr(mnt, dentry, stat); | |
743 | ||
bd238fb4 LI |
744 | fid = v9fs_fid_lookup(dentry); |
745 | if (IS_ERR(fid)) | |
da977b2c | 746 | return PTR_ERR(fid); |
2bad8471 | 747 | |
bd238fb4 LI |
748 | st = p9_client_stat(fid); |
749 | if (IS_ERR(st)) | |
750 | return PTR_ERR(st); | |
2bad8471 | 751 | |
bd238fb4 | 752 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 753 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 754 | |
bd238fb4 LI |
755 | kfree(st); |
756 | return 0; | |
2bad8471 EVH |
757 | } |
758 | ||
759 | /** | |
760 | * v9fs_vfs_setattr - set file metadata | |
761 | * @dentry: file whose metadata to set | |
762 | * @iattr: metadata assignment structure | |
763 | * | |
764 | */ | |
765 | ||
766 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
767 | { | |
bd238fb4 LI |
768 | int retval; |
769 | struct v9fs_session_info *v9ses; | |
770 | struct p9_fid *fid; | |
771 | struct p9_wstat wstat; | |
2bad8471 | 772 | |
bd238fb4 LI |
773 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
774 | retval = -EPERM; | |
775 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
776 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
777 | if(IS_ERR(fid)) |
778 | return PTR_ERR(fid); | |
2bad8471 | 779 | |
531b1094 | 780 | v9fs_blank_wstat(&wstat); |
2bad8471 | 781 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 782 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
783 | |
784 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 785 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
786 | |
787 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 788 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
789 | |
790 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 791 | wstat.length = iattr->ia_size; |
2bad8471 | 792 | |
2405669b | 793 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
794 | if (iattr->ia_valid & ATTR_UID) |
795 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 796 | |
531b1094 LI |
797 | if (iattr->ia_valid & ATTR_GID) |
798 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
799 | } |
800 | ||
bd238fb4 LI |
801 | retval = p9_client_wstat(fid, &wstat); |
802 | if (retval >= 0) | |
803 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 804 | |
bd238fb4 | 805 | return retval; |
2bad8471 EVH |
806 | } |
807 | ||
808 | /** | |
531b1094 LI |
809 | * v9fs_stat2inode - populate an inode structure with mistat info |
810 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
811 | * @inode: inode to populate |
812 | * @sb: superblock of filesystem | |
813 | * | |
814 | */ | |
815 | ||
816 | void | |
bd238fb4 | 817 | v9fs_stat2inode(struct p9_stat *stat, struct inode *inode, |
531b1094 | 818 | struct super_block *sb) |
2bad8471 | 819 | { |
1dac06b2 | 820 | int n; |
531b1094 | 821 | char ext[32]; |
2bad8471 EVH |
822 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
823 | ||
824 | inode->i_nlink = 1; | |
825 | ||
531b1094 LI |
826 | inode->i_atime.tv_sec = stat->atime; |
827 | inode->i_mtime.tv_sec = stat->mtime; | |
828 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 829 | |
bd32b82d LI |
830 | inode->i_uid = v9ses->dfltuid; |
831 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 832 | |
2405669b | 833 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
834 | inode->i_uid = stat->n_uid; |
835 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
836 | } |
837 | ||
531b1094 | 838 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
839 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
840 | char type = 0; | |
841 | int major = -1; | |
842 | int minor = -1; | |
531b1094 | 843 | |
1dac06b2 LI |
844 | n = stat->extension.len; |
845 | if (n > sizeof(ext)-1) | |
846 | n = sizeof(ext)-1; | |
847 | memmove(ext, stat->extension.str, n); | |
848 | ext[n] = 0; | |
531b1094 | 849 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
850 | switch (type) { |
851 | case 'c': | |
852 | inode->i_mode &= ~S_IFBLK; | |
853 | inode->i_mode |= S_IFCHR; | |
854 | break; | |
855 | case 'b': | |
856 | break; | |
857 | default: | |
bd238fb4 LI |
858 | P9_DPRINTK(P9_DEBUG_ERROR, |
859 | "Unknown special type %c (%.*s)\n", type, | |
860 | stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
861 | }; |
862 | inode->i_rdev = MKDEV(major, minor); | |
863 | } else | |
864 | inode->i_rdev = 0; | |
865 | ||
531b1094 | 866 | inode->i_size = stat->length; |
2bad8471 | 867 | |
bd238fb4 LI |
868 | /* not real number of blocks, but 512 byte ones ... */ |
869 | inode->i_blocks = (inode->i_size + 512 - 1) >> 9; | |
2bad8471 EVH |
870 | } |
871 | ||
872 | /** | |
873 | * v9fs_qid2ino - convert qid into inode number | |
874 | * @qid: qid to hash | |
875 | * | |
876 | * BUG: potential for inode number collisions? | |
877 | */ | |
878 | ||
bd238fb4 | 879 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
880 | { |
881 | u64 path = qid->path + 2; | |
882 | ino_t i = 0; | |
883 | ||
884 | if (sizeof(ino_t) == sizeof(path)) | |
885 | memcpy(&i, &path, sizeof(ino_t)); | |
886 | else | |
887 | i = (ino_t) (path ^ (path >> 32)); | |
888 | ||
889 | return i; | |
890 | } | |
891 | ||
2bad8471 EVH |
892 | /** |
893 | * v9fs_readlink - read a symlink's location (internal version) | |
894 | * @dentry: dentry for symlink | |
73c592b9 | 895 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
896 | * @buflen: length of buffer |
897 | * | |
898 | */ | |
899 | ||
900 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
901 | { | |
bd238fb4 | 902 | int retval; |
2bad8471 | 903 | |
bd238fb4 LI |
904 | struct v9fs_session_info *v9ses; |
905 | struct p9_fid *fid; | |
906 | struct p9_stat *st; | |
2bad8471 | 907 | |
bd238fb4 LI |
908 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
909 | retval = -EPERM; | |
910 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
911 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 912 | if (IS_ERR(fid)) |
da977b2c | 913 | return PTR_ERR(fid); |
2bad8471 | 914 | |
2405669b | 915 | if (!v9fs_extended(v9ses)) |
bd238fb4 | 916 | return -EBADF; |
2bad8471 | 917 | |
bd238fb4 LI |
918 | st = p9_client_stat(fid); |
919 | if (IS_ERR(st)) | |
920 | return PTR_ERR(st); | |
2bad8471 | 921 | |
bd238fb4 | 922 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 923 | retval = -EINVAL; |
bd238fb4 | 924 | goto done; |
2bad8471 EVH |
925 | } |
926 | ||
927 | /* copy extension buffer into buffer */ | |
bd238fb4 LI |
928 | if (st->extension.len < buflen) |
929 | buflen = st->extension.len + 1; | |
2bad8471 | 930 | |
bd238fb4 | 931 | memmove(buffer, st->extension.str, buflen - 1); |
531b1094 | 932 | buffer[buflen-1] = 0; |
2bad8471 | 933 | |
bd238fb4 LI |
934 | P9_DPRINTK(P9_DEBUG_VFS, |
935 | "%s -> %.*s (%s)\n", dentry->d_name.name, st->extension.len, | |
936 | st->extension.str, buffer); | |
2bad8471 | 937 | |
bd238fb4 | 938 | retval = buflen; |
da977b2c | 939 | |
bd238fb4 LI |
940 | done: |
941 | kfree(st); | |
2bad8471 EVH |
942 | return retval; |
943 | } | |
944 | ||
945 | /** | |
946 | * v9fs_vfs_readlink - read a symlink's location | |
947 | * @dentry: dentry for symlink | |
ee443996 | 948 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
949 | * @buflen: length of buffer |
950 | * | |
951 | */ | |
952 | ||
953 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
954 | int buflen) | |
955 | { | |
956 | int retval; | |
957 | int ret; | |
958 | char *link = __getname(); | |
959 | ||
0710d36a FM |
960 | if (unlikely(!link)) |
961 | return -ENOMEM; | |
962 | ||
a1f9d8d2 LI |
963 | if (buflen > PATH_MAX) |
964 | buflen = PATH_MAX; | |
2bad8471 | 965 | |
bd238fb4 | 966 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
2bad8471 EVH |
967 | |
968 | retval = v9fs_readlink(dentry, link, buflen); | |
969 | ||
970 | if (retval > 0) { | |
971 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
bd238fb4 LI |
972 | P9_DPRINTK(P9_DEBUG_ERROR, |
973 | "problem copying to user: %d\n", ret); | |
2bad8471 EVH |
974 | retval = ret; |
975 | } | |
976 | } | |
977 | ||
ce44eeb6 | 978 | __putname(link); |
2bad8471 EVH |
979 | return retval; |
980 | } | |
981 | ||
982 | /** | |
983 | * v9fs_vfs_follow_link - follow a symlink path | |
984 | * @dentry: dentry for symlink | |
985 | * @nd: nameidata | |
986 | * | |
987 | */ | |
988 | ||
989 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
990 | { | |
991 | int len = 0; | |
992 | char *link = __getname(); | |
993 | ||
bd238fb4 | 994 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
995 | |
996 | if (!link) | |
997 | link = ERR_PTR(-ENOMEM); | |
998 | else { | |
16cce6d2 | 999 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1000 | |
1001 | if (len < 0) { | |
ce44eeb6 | 1002 | __putname(link); |
2bad8471 EVH |
1003 | link = ERR_PTR(len); |
1004 | } else | |
1005 | link[len] = 0; | |
1006 | } | |
1007 | nd_set_link(nd, link); | |
1008 | ||
1009 | return NULL; | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * v9fs_vfs_put_link - release a symlink path | |
1014 | * @dentry: dentry for symlink | |
1015 | * @nd: nameidata | |
ee443996 | 1016 | * @p: unused |
2bad8471 EVH |
1017 | * |
1018 | */ | |
1019 | ||
ee443996 EVH |
1020 | static void |
1021 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1022 | { |
1023 | char *s = nd_get_link(nd); | |
1024 | ||
bd238fb4 | 1025 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); |
2bad8471 | 1026 | if (!IS_ERR(s)) |
ce44eeb6 | 1027 | __putname(s); |
2bad8471 EVH |
1028 | } |
1029 | ||
ee443996 EVH |
1030 | /** |
1031 | * v9fs_vfs_mkspecial - create a special file | |
1032 | * @dir: inode to create special file in | |
1033 | * @dentry: dentry to create | |
1034 | * @mode: mode to create special file | |
1035 | * @extension: 9p2000.u format extension string representing special file | |
1036 | * | |
1037 | */ | |
1038 | ||
531b1094 LI |
1039 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1040 | int mode, const char *extension) | |
2bad8471 | 1041 | { |
bd238fb4 | 1042 | u32 perm; |
531b1094 | 1043 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1044 | struct p9_fid *fid; |
2bad8471 | 1045 | |
6a3124a3 | 1046 | v9ses = v9fs_inode2v9ses(dir); |
2405669b | 1047 | if (!v9fs_extended(v9ses)) { |
bd238fb4 | 1048 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1049 | return -EPERM; |
2bad8471 EVH |
1050 | } |
1051 | ||
da977b2c | 1052 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1053 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1054 | P9_OREAD); | |
1055 | if (IS_ERR(fid)) | |
1056 | return PTR_ERR(fid); | |
da977b2c | 1057 | |
bd238fb4 | 1058 | p9_client_clunk(fid); |
6a3124a3 | 1059 | return 0; |
531b1094 LI |
1060 | } |
1061 | ||
1062 | /** | |
1063 | * v9fs_vfs_symlink - helper function to create symlinks | |
1064 | * @dir: directory inode containing symlink | |
1065 | * @dentry: dentry for symlink | |
1066 | * @symname: symlink data | |
1067 | * | |
ee443996 | 1068 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1069 | * |
1070 | */ | |
1071 | ||
1072 | static int | |
1073 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1074 | { | |
bd238fb4 LI |
1075 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1076 | dentry->d_name.name, symname); | |
531b1094 LI |
1077 | |
1078 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * v9fs_vfs_link - create a hardlink | |
1083 | * @old_dentry: dentry for file to link to | |
1084 | * @dir: inode destination for new link | |
1085 | * @dentry: dentry for link | |
1086 | * | |
1087 | */ | |
1088 | ||
531b1094 LI |
1089 | static int |
1090 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1091 | struct dentry *dentry) | |
1092 | { | |
1093 | int retval; | |
bd238fb4 | 1094 | struct p9_fid *oldfid; |
531b1094 LI |
1095 | char *name; |
1096 | ||
bd238fb4 LI |
1097 | P9_DPRINTK(P9_DEBUG_VFS, |
1098 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1099 | old_dentry->d_name.name); |
1100 | ||
da977b2c | 1101 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1102 | if (IS_ERR(oldfid)) |
da977b2c | 1103 | return PTR_ERR(oldfid); |
531b1094 LI |
1104 | |
1105 | name = __getname(); | |
da977b2c EVH |
1106 | if (unlikely(!name)) { |
1107 | retval = -ENOMEM; | |
1108 | goto clunk_fid; | |
1109 | } | |
0710d36a | 1110 | |
16cce6d2 | 1111 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1112 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1113 | __putname(name); |
2bad8471 | 1114 | |
da977b2c | 1115 | clunk_fid: |
bd238fb4 | 1116 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1117 | return retval; |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * v9fs_vfs_mknod - create a special file | |
1122 | * @dir: inode destination for new link | |
1123 | * @dentry: dentry for file | |
1124 | * @mode: mode for creation | |
ee443996 | 1125 | * @rdev: device associated with special file |
2bad8471 EVH |
1126 | * |
1127 | */ | |
1128 | ||
1129 | static int | |
1130 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1131 | { | |
531b1094 LI |
1132 | int retval; |
1133 | char *name; | |
2bad8471 | 1134 | |
bd238fb4 LI |
1135 | P9_DPRINTK(P9_DEBUG_VFS, |
1136 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1137 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1138 | ||
531b1094 LI |
1139 | if (!new_valid_dev(rdev)) |
1140 | return -EINVAL; | |
2bad8471 | 1141 | |
531b1094 | 1142 | name = __getname(); |
c0291a05 ET |
1143 | if (!name) |
1144 | return -ENOMEM; | |
2bad8471 EVH |
1145 | /* build extension */ |
1146 | if (S_ISBLK(mode)) | |
531b1094 | 1147 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1148 | else if (S_ISCHR(mode)) |
531b1094 | 1149 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1150 | else if (S_ISFIFO(mode)) |
531b1094 | 1151 | *name = 0; |
2bad8471 | 1152 | else { |
531b1094 LI |
1153 | __putname(name); |
1154 | return -EINVAL; | |
2bad8471 EVH |
1155 | } |
1156 | ||
531b1094 LI |
1157 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1158 | __putname(name); | |
2bad8471 EVH |
1159 | |
1160 | return retval; | |
1161 | } | |
1162 | ||
754661f1 | 1163 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1164 | .create = v9fs_vfs_create, |
1165 | .lookup = v9fs_vfs_lookup, | |
1166 | .symlink = v9fs_vfs_symlink, | |
1167 | .link = v9fs_vfs_link, | |
1168 | .unlink = v9fs_vfs_unlink, | |
1169 | .mkdir = v9fs_vfs_mkdir, | |
1170 | .rmdir = v9fs_vfs_rmdir, | |
1171 | .mknod = v9fs_vfs_mknod, | |
1172 | .rename = v9fs_vfs_rename, | |
1173 | .readlink = v9fs_vfs_readlink, | |
1174 | .getattr = v9fs_vfs_getattr, | |
1175 | .setattr = v9fs_vfs_setattr, | |
1176 | }; | |
1177 | ||
754661f1 | 1178 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1179 | .create = v9fs_vfs_create, |
1180 | .lookup = v9fs_vfs_lookup, | |
1181 | .unlink = v9fs_vfs_unlink, | |
1182 | .mkdir = v9fs_vfs_mkdir, | |
1183 | .rmdir = v9fs_vfs_rmdir, | |
1184 | .mknod = v9fs_vfs_mknod, | |
1185 | .rename = v9fs_vfs_rename, | |
1186 | .getattr = v9fs_vfs_getattr, | |
1187 | .setattr = v9fs_vfs_setattr, | |
1188 | }; | |
1189 | ||
754661f1 | 1190 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1191 | .getattr = v9fs_vfs_getattr, |
1192 | .setattr = v9fs_vfs_setattr, | |
1193 | }; | |
1194 | ||
754661f1 | 1195 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1196 | .readlink = v9fs_vfs_readlink, |
1197 | .follow_link = v9fs_vfs_follow_link, | |
1198 | .put_link = v9fs_vfs_put_link, | |
1199 | .getattr = v9fs_vfs_getattr, | |
1200 | .setattr = v9fs_vfs_setattr, | |
1201 | }; |