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 | |
2e4bef41 | 135 | * @extended: if .u extensions are active |
ee443996 EVH |
136 | */ |
137 | ||
2e4bef41 | 138 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
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 | ||
6a3124a3 | 158 | if (uflags & O_TRUNC) |
bd238fb4 | 159 | ret |= P9_OTRUNC; |
6a3124a3 | 160 | |
2e4bef41 EVH |
161 | if (extended) { |
162 | if (uflags & O_EXCL) | |
163 | ret |= P9_OEXCL; | |
164 | ||
165 | if (uflags & O_APPEND) | |
166 | ret |= P9_OAPPEND; | |
167 | } | |
6a3124a3 LI |
168 | |
169 | return ret; | |
170 | } | |
171 | ||
2bad8471 | 172 | /** |
531b1094 | 173 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
2bad8471 | 174 | * @v9ses: 9P session info (for determining extended mode) |
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 | ||
201 | /** | |
202 | * v9fs_get_inode - helper function to setup an inode | |
203 | * @sb: superblock | |
204 | * @mode: mode to setup inode with | |
205 | * | |
206 | */ | |
207 | ||
208 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
209 | { | |
6a3124a3 | 210 | struct inode *inode; |
b501611a | 211 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 212 | |
bd238fb4 | 213 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
214 | |
215 | inode = new_inode(sb); | |
216 | if (inode) { | |
217 | inode->i_mode = mode; | |
218 | inode->i_uid = current->fsuid; | |
219 | inode->i_gid = current->fsgid; | |
2bad8471 EVH |
220 | inode->i_blocks = 0; |
221 | inode->i_rdev = 0; | |
222 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
147b31cf | 223 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
2bad8471 EVH |
224 | |
225 | switch (mode & S_IFMT) { | |
226 | case S_IFIFO: | |
227 | case S_IFBLK: | |
228 | case S_IFCHR: | |
229 | case S_IFSOCK: | |
2405669b | 230 | if (!v9fs_extended(v9ses)) { |
bd238fb4 LI |
231 | P9_DPRINTK(P9_DEBUG_ERROR, |
232 | "special files without extended mode\n"); | |
b501611a EVH |
233 | return ERR_PTR(-EINVAL); |
234 | } | |
5d58bec5 EVH |
235 | init_special_inode(inode, inode->i_mode, |
236 | inode->i_rdev); | |
237 | break; | |
2bad8471 EVH |
238 | case S_IFREG: |
239 | inode->i_op = &v9fs_file_inode_operations; | |
240 | inode->i_fop = &v9fs_file_operations; | |
241 | break; | |
b501611a | 242 | case S_IFLNK: |
2405669b | 243 | if (!v9fs_extended(v9ses)) { |
bd238fb4 LI |
244 | P9_DPRINTK(P9_DEBUG_ERROR, |
245 | "extended modes used w/o 9P2000.u\n"); | |
b501611a EVH |
246 | return ERR_PTR(-EINVAL); |
247 | } | |
248 | inode->i_op = &v9fs_symlink_inode_operations; | |
249 | break; | |
2bad8471 | 250 | case S_IFDIR: |
d8c76e6f | 251 | inc_nlink(inode); |
2405669b | 252 | if (v9fs_extended(v9ses)) |
b501611a EVH |
253 | inode->i_op = &v9fs_dir_inode_operations_ext; |
254 | else | |
255 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
256 | inode->i_fop = &v9fs_dir_operations; |
257 | break; | |
2bad8471 | 258 | default: |
bd238fb4 LI |
259 | P9_DPRINTK(P9_DEBUG_ERROR, |
260 | "BAD mode 0x%x S_IFMT 0x%x\n", | |
2bad8471 EVH |
261 | mode, mode & S_IFMT); |
262 | return ERR_PTR(-EINVAL); | |
263 | } | |
264 | } else { | |
bd238fb4 | 265 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); |
2bad8471 EVH |
266 | return ERR_PTR(-ENOMEM); |
267 | } | |
268 | return inode; | |
269 | } | |
270 | ||
bd238fb4 | 271 | /* |
6a3124a3 LI |
272 | static struct v9fs_fid* |
273 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
274 | { | |
275 | int err; | |
736c4b85 | 276 | int nfid; |
6a3124a3 LI |
277 | struct v9fs_fid *ret; |
278 | struct v9fs_fcall *fcall; | |
279 | ||
280 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
281 | if (nfid < 0) { | |
0b8dd177 | 282 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 283 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
284 | } |
285 | ||
6a3124a3 LI |
286 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
287 | &fcall); | |
288 | ||
289 | if (err < 0) { | |
41e5a6ac LI |
290 | if (fcall && fcall->id == RWALK) |
291 | goto clunk_fid; | |
292 | ||
6a3124a3 LI |
293 | PRINT_FCALL_ERROR("walk error", fcall); |
294 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
295 | goto error; | |
0b8dd177 | 296 | } |
6a3124a3 | 297 | |
3cf6429a LI |
298 | kfree(fcall); |
299 | fcall = NULL; | |
6a3124a3 LI |
300 | ret = v9fs_fid_create(v9ses, nfid); |
301 | if (!ret) { | |
302 | err = -ENOMEM; | |
303 | goto clunk_fid; | |
304 | } | |
0b8dd177 | 305 | |
6a3124a3 LI |
306 | err = v9fs_fid_insert(ret, dentry); |
307 | if (err < 0) { | |
308 | v9fs_fid_destroy(ret); | |
309 | goto clunk_fid; | |
0b8dd177 | 310 | } |
2bad8471 | 311 | |
6a3124a3 | 312 | return ret; |
2bad8471 | 313 | |
6a3124a3 LI |
314 | clunk_fid: |
315 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 316 | |
6a3124a3 LI |
317 | error: |
318 | kfree(fcall); | |
319 | return ERR_PTR(err); | |
320 | } | |
bd238fb4 | 321 | */ |
2bad8471 | 322 | |
ee443996 EVH |
323 | /** |
324 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
325 | * @v9ses: session information | |
326 | * @fid: fid to issue attribute request for | |
327 | * @sb: superblock on which to create inode | |
328 | * | |
329 | */ | |
330 | ||
5174fdab | 331 | static struct inode * |
bd238fb4 | 332 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
333 | struct super_block *sb) |
334 | { | |
335 | int err, umode; | |
336 | struct inode *ret; | |
bd238fb4 | 337 | struct p9_stat *st; |
531b1094 | 338 | |
6a3124a3 | 339 | ret = NULL; |
bd238fb4 LI |
340 | st = p9_client_stat(fid); |
341 | if (IS_ERR(st)) { | |
342 | err = PTR_ERR(st); | |
343 | st = NULL; | |
6a3124a3 | 344 | goto error; |
2bad8471 EVH |
345 | } |
346 | ||
bd238fb4 | 347 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
348 | ret = v9fs_get_inode(sb, umode); |
349 | if (IS_ERR(ret)) { | |
350 | err = PTR_ERR(ret); | |
351 | ret = NULL; | |
352 | goto error; | |
353 | } | |
2bad8471 | 354 | |
bd238fb4 LI |
355 | v9fs_stat2inode(st, ret, sb); |
356 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
357 | kfree(st); | |
6a3124a3 | 358 | return ret; |
2bad8471 | 359 | |
6a3124a3 | 360 | error: |
bd238fb4 | 361 | kfree(st); |
6a3124a3 LI |
362 | if (ret) |
363 | iput(ret); | |
2bad8471 | 364 | |
6a3124a3 | 365 | return ERR_PTR(err); |
2bad8471 EVH |
366 | } |
367 | ||
368 | /** | |
369 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
370 | * @dir: directory inode that is being deleted |
371 | * @file: dentry that is being deleted | |
372 | * @rmdir: removing a directory | |
2bad8471 EVH |
373 | * |
374 | */ | |
375 | ||
376 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
377 | { | |
bd238fb4 LI |
378 | struct inode *file_inode; |
379 | struct v9fs_session_info *v9ses; | |
380 | struct p9_fid *v9fid; | |
2bad8471 | 381 | |
bd238fb4 | 382 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
383 | rmdir); |
384 | ||
385 | file_inode = file->d_inode; | |
2bad8471 | 386 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 387 | v9fid = v9fs_fid_clone(file); |
ba17674f | 388 | if (IS_ERR(v9fid)) |
da977b2c | 389 | return PTR_ERR(v9fid); |
2bad8471 | 390 | |
bd238fb4 | 391 | return p9_client_remove(v9fid); |
2bad8471 EVH |
392 | } |
393 | ||
6a3124a3 LI |
394 | static int |
395 | v9fs_open_created(struct inode *inode, struct file *file) | |
396 | { | |
397 | return 0; | |
398 | } | |
399 | ||
bd238fb4 | 400 | |
2bad8471 | 401 | /** |
bd238fb4 | 402 | * v9fs_create - Create a file |
ee443996 EVH |
403 | * @v9ses: session information |
404 | * @dir: directory that dentry is being created in | |
bd238fb4 LI |
405 | * @dentry: dentry that is being created |
406 | * @perm: create permissions | |
407 | * @mode: open mode | |
ee443996 | 408 | * @extension: 9p2000.u extension string to support devices, etc. |
2bad8471 EVH |
409 | * |
410 | */ | |
bd238fb4 LI |
411 | static struct p9_fid * |
412 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
413 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 414 | { |
6a3124a3 | 415 | int err; |
bd238fb4 LI |
416 | char *name; |
417 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 418 | struct inode *inode; |
6a3124a3 | 419 | |
bd238fb4 LI |
420 | err = 0; |
421 | ofid = NULL; | |
422 | fid = NULL; | |
423 | name = (char *) dentry->d_name.name; | |
da977b2c | 424 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 425 | if (IS_ERR(dfid)) { |
da977b2c | 426 | err = PTR_ERR(dfid); |
bd238fb4 | 427 | dfid = NULL; |
da977b2c EVH |
428 | goto error; |
429 | } | |
6a3124a3 | 430 | |
bd238fb4 LI |
431 | /* clone a fid to use for creation */ |
432 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
433 | if (IS_ERR(ofid)) { | |
434 | err = PTR_ERR(ofid); | |
435 | ofid = NULL; | |
436 | goto error; | |
437 | } | |
6a3124a3 | 438 | |
bd238fb4 LI |
439 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
440 | if (err < 0) | |
441 | goto error; | |
6a3124a3 | 442 | |
bd238fb4 LI |
443 | /* now walk from the parent so we can get unopened fid */ |
444 | fid = p9_client_walk(dfid, 1, &name, 0); | |
445 | if (IS_ERR(fid)) { | |
446 | err = PTR_ERR(fid); | |
447 | fid = NULL; | |
6a3124a3 | 448 | goto error; |
bd238fb4 LI |
449 | } else |
450 | dfid = NULL; | |
6a3124a3 | 451 | |
bd238fb4 LI |
452 | /* instantiate inode and assign the unopened fid to the dentry */ |
453 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
454 | if (IS_ERR(inode)) { |
455 | err = PTR_ERR(inode); | |
6a3124a3 LI |
456 | goto error; |
457 | } | |
458 | ||
ba17674f | 459 | if (v9ses->cache) |
e03abc0c EVH |
460 | dentry->d_op = &v9fs_cached_dentry_operations; |
461 | else | |
462 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 463 | |
6a3124a3 | 464 | d_instantiate(dentry, inode); |
bd238fb4 LI |
465 | v9fs_fid_add(dentry, fid); |
466 | return ofid; | |
6a3124a3 | 467 | |
bd238fb4 LI |
468 | error: |
469 | if (dfid) | |
470 | p9_client_clunk(dfid); | |
471 | ||
472 | if (ofid) | |
473 | p9_client_clunk(ofid); | |
474 | ||
475 | if (fid) | |
476 | p9_client_clunk(fid); | |
477 | ||
478 | return ERR_PTR(err); | |
479 | } | |
480 | ||
481 | /** | |
482 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 483 | * @dir: directory inode that is being created |
bd238fb4 LI |
484 | * @dentry: dentry that is being deleted |
485 | * @mode: create permissions | |
486 | * @nd: path information | |
487 | * | |
488 | */ | |
6a3124a3 | 489 | |
bd238fb4 LI |
490 | static int |
491 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
492 | struct nameidata *nd) | |
493 | { | |
494 | int err; | |
495 | u32 perm; | |
496 | int flags; | |
497 | struct v9fs_session_info *v9ses; | |
498 | struct p9_fid *fid; | |
499 | struct file *filp; | |
500 | ||
501 | err = 0; | |
502 | fid = NULL; | |
503 | v9ses = v9fs_inode2v9ses(dir); | |
504 | perm = unixmode2p9mode(v9ses, mode); | |
505 | if (nd && nd->flags & LOOKUP_OPEN) | |
506 | flags = nd->intent.open.flags - 1; | |
507 | else | |
508 | flags = O_RDWR; | |
509 | ||
510 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
2e4bef41 | 511 | v9fs_uflags2omode(flags, v9fs_extended(v9ses))); |
bd238fb4 LI |
512 | if (IS_ERR(fid)) { |
513 | err = PTR_ERR(fid); | |
514 | fid = NULL; | |
515 | goto error; | |
516 | } | |
517 | ||
518 | /* if we are opening a file, assign the open fid to the file */ | |
519 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
520 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
521 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
522 | err = PTR_ERR(filp); |
523 | goto error; | |
6a3124a3 LI |
524 | } |
525 | ||
bd238fb4 LI |
526 | filp->private_data = fid; |
527 | } else | |
528 | p9_client_clunk(fid); | |
6a3124a3 LI |
529 | |
530 | return 0; | |
531 | ||
532 | error: | |
bd238fb4 LI |
533 | if (fid) |
534 | p9_client_clunk(fid); | |
6a3124a3 | 535 | |
6a3124a3 | 536 | return err; |
2bad8471 EVH |
537 | } |
538 | ||
539 | /** | |
540 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 541 | * @dir: inode that is being unlinked |
2bad8471 EVH |
542 | * @dentry: dentry that is being unlinked |
543 | * @mode: mode for new directory | |
544 | * | |
545 | */ | |
546 | ||
6a3124a3 | 547 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 548 | { |
6a3124a3 | 549 | int err; |
bd238fb4 | 550 | u32 perm; |
6a3124a3 | 551 | struct v9fs_session_info *v9ses; |
bd238fb4 | 552 | struct p9_fid *fid; |
6a3124a3 | 553 | |
bd238fb4 LI |
554 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
555 | err = 0; | |
6a3124a3 | 556 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 557 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
558 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
559 | if (IS_ERR(fid)) { | |
560 | err = PTR_ERR(fid); | |
561 | fid = NULL; | |
6a3124a3 LI |
562 | } |
563 | ||
bd238fb4 LI |
564 | if (fid) |
565 | p9_client_clunk(fid); | |
6a3124a3 | 566 | |
6a3124a3 | 567 | return err; |
2bad8471 EVH |
568 | } |
569 | ||
570 | /** | |
571 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
572 | * @dir: inode that is being walked from | |
573 | * @dentry: dentry that is being walked to? | |
574 | * @nameidata: path data | |
575 | * | |
576 | */ | |
577 | ||
578 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
579 | struct nameidata *nameidata) | |
580 | { | |
581 | struct super_block *sb; | |
582 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 583 | struct p9_fid *dfid, *fid; |
2bad8471 | 584 | struct inode *inode; |
bd238fb4 | 585 | char *name; |
2bad8471 EVH |
586 | int result = 0; |
587 | ||
bd238fb4 | 588 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 589 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
590 | |
591 | sb = dir->i_sb; | |
592 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
593 | dfid = v9fs_fid_lookup(dentry->d_parent); |
594 | if (IS_ERR(dfid)) | |
e231c2ee | 595 | return ERR_CAST(dfid); |
bd238fb4 LI |
596 | |
597 | name = (char *) dentry->d_name.name; | |
598 | fid = p9_client_walk(dfid, 1, &name, 1); | |
599 | if (IS_ERR(fid)) { | |
600 | result = PTR_ERR(fid); | |
2bad8471 EVH |
601 | if (result == -ENOENT) { |
602 | d_add(dentry, NULL); | |
2bad8471 EVH |
603 | return NULL; |
604 | } | |
2bad8471 | 605 | |
bd238fb4 | 606 | return ERR_PTR(result); |
2bad8471 EVH |
607 | } |
608 | ||
bd238fb4 LI |
609 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
610 | if (IS_ERR(inode)) { | |
611 | result = PTR_ERR(inode); | |
612 | inode = NULL; | |
613 | goto error; | |
2bad8471 EVH |
614 | } |
615 | ||
bd238fb4 | 616 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 617 | if (result < 0) |
bd238fb4 | 618 | goto error; |
6a3124a3 | 619 | |
ba17674f | 620 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
621 | dentry->d_op = &v9fs_cached_dentry_operations; |
622 | else | |
623 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
624 | |
625 | d_add(dentry, inode); | |
2bad8471 EVH |
626 | return NULL; |
627 | ||
bd238fb4 LI |
628 | error: |
629 | if (fid) | |
630 | p9_client_clunk(fid); | |
da977b2c | 631 | |
2bad8471 EVH |
632 | return ERR_PTR(result); |
633 | } | |
634 | ||
635 | /** | |
636 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
637 | * @i: inode that is being unlinked | |
73c592b9 | 638 | * @d: dentry that is being unlinked |
2bad8471 EVH |
639 | * |
640 | */ | |
641 | ||
642 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
643 | { | |
644 | return v9fs_remove(i, d, 0); | |
645 | } | |
646 | ||
647 | /** | |
648 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
649 | * @i: inode that is being unlinked | |
73c592b9 | 650 | * @d: dentry that is being unlinked |
2bad8471 EVH |
651 | * |
652 | */ | |
653 | ||
654 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
655 | { | |
656 | return v9fs_remove(i, d, 1); | |
657 | } | |
658 | ||
659 | /** | |
660 | * v9fs_vfs_rename - VFS hook to rename an inode | |
661 | * @old_dir: old dir inode | |
662 | * @old_dentry: old dentry | |
663 | * @new_dir: new dir inode | |
664 | * @new_dentry: new dentry | |
665 | * | |
666 | */ | |
667 | ||
668 | static int | |
669 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
670 | struct inode *new_dir, struct dentry *new_dentry) | |
671 | { | |
bd238fb4 LI |
672 | struct inode *old_inode; |
673 | struct v9fs_session_info *v9ses; | |
674 | struct p9_fid *oldfid; | |
675 | struct p9_fid *olddirfid; | |
676 | struct p9_fid *newdirfid; | |
677 | struct p9_wstat wstat; | |
678 | int retval; | |
2bad8471 | 679 | |
bd238fb4 LI |
680 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
681 | retval = 0; | |
682 | old_inode = old_dentry->d_inode; | |
683 | v9ses = v9fs_inode2v9ses(old_inode); | |
684 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 685 | if (IS_ERR(oldfid)) |
da977b2c EVH |
686 | return PTR_ERR(oldfid); |
687 | ||
688 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 689 | if (IS_ERR(olddirfid)) { |
da977b2c | 690 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 691 | goto done; |
da977b2c EVH |
692 | } |
693 | ||
694 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 695 | if (IS_ERR(newdirfid)) { |
da977b2c | 696 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 697 | goto clunk_olddir; |
2bad8471 EVH |
698 | } |
699 | ||
700 | /* 9P can only handle file rename in the same directory */ | |
701 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
702 | P9_DPRINTK(P9_DEBUG_ERROR, |
703 | "old dir and new dir are different\n"); | |
621997cd | 704 | retval = -EXDEV; |
bd238fb4 | 705 | goto clunk_newdir; |
2bad8471 EVH |
706 | } |
707 | ||
531b1094 | 708 | v9fs_blank_wstat(&wstat); |
ba17674f | 709 | wstat.muid = v9ses->uname; |
531b1094 | 710 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 711 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 712 | |
bd238fb4 | 713 | clunk_newdir: |
22150c4f | 714 | p9_client_clunk(newdirfid); |
2bad8471 | 715 | |
bd238fb4 | 716 | clunk_olddir: |
22150c4f | 717 | p9_client_clunk(olddirfid); |
da977b2c | 718 | |
bd238fb4 | 719 | done: |
2bad8471 EVH |
720 | return retval; |
721 | } | |
722 | ||
723 | /** | |
943ffb58 | 724 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
725 | * @mnt: mount information |
726 | * @dentry: file to get attributes on | |
727 | * @stat: metadata structure to populate | |
2bad8471 EVH |
728 | * |
729 | */ | |
730 | ||
731 | static int | |
732 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
733 | struct kstat *stat) | |
734 | { | |
bd238fb4 LI |
735 | int err; |
736 | struct v9fs_session_info *v9ses; | |
737 | struct p9_fid *fid; | |
738 | struct p9_stat *st; | |
739 | ||
740 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
741 | err = -EPERM; | |
742 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
9523a841 EVH |
743 | if (v9ses->cache == CACHE_LOOSE) |
744 | return simple_getattr(mnt, dentry, stat); | |
745 | ||
bd238fb4 LI |
746 | fid = v9fs_fid_lookup(dentry); |
747 | if (IS_ERR(fid)) | |
da977b2c | 748 | return PTR_ERR(fid); |
2bad8471 | 749 | |
bd238fb4 LI |
750 | st = p9_client_stat(fid); |
751 | if (IS_ERR(st)) | |
752 | return PTR_ERR(st); | |
2bad8471 | 753 | |
bd238fb4 | 754 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 755 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 756 | |
bd238fb4 LI |
757 | kfree(st); |
758 | return 0; | |
2bad8471 EVH |
759 | } |
760 | ||
761 | /** | |
762 | * v9fs_vfs_setattr - set file metadata | |
763 | * @dentry: file whose metadata to set | |
764 | * @iattr: metadata assignment structure | |
765 | * | |
766 | */ | |
767 | ||
768 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
769 | { | |
bd238fb4 LI |
770 | int retval; |
771 | struct v9fs_session_info *v9ses; | |
772 | struct p9_fid *fid; | |
773 | struct p9_wstat wstat; | |
2bad8471 | 774 | |
bd238fb4 LI |
775 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
776 | retval = -EPERM; | |
777 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
778 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
779 | if(IS_ERR(fid)) |
780 | return PTR_ERR(fid); | |
2bad8471 | 781 | |
531b1094 | 782 | v9fs_blank_wstat(&wstat); |
2bad8471 | 783 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 784 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
785 | |
786 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 787 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
788 | |
789 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 790 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
791 | |
792 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 793 | wstat.length = iattr->ia_size; |
2bad8471 | 794 | |
2405669b | 795 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
796 | if (iattr->ia_valid & ATTR_UID) |
797 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 798 | |
531b1094 LI |
799 | if (iattr->ia_valid & ATTR_GID) |
800 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
801 | } |
802 | ||
bd238fb4 LI |
803 | retval = p9_client_wstat(fid, &wstat); |
804 | if (retval >= 0) | |
805 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 806 | |
bd238fb4 | 807 | return retval; |
2bad8471 EVH |
808 | } |
809 | ||
810 | /** | |
531b1094 LI |
811 | * v9fs_stat2inode - populate an inode structure with mistat info |
812 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
813 | * @inode: inode to populate |
814 | * @sb: superblock of filesystem | |
815 | * | |
816 | */ | |
817 | ||
818 | void | |
bd238fb4 | 819 | v9fs_stat2inode(struct p9_stat *stat, struct inode *inode, |
531b1094 | 820 | struct super_block *sb) |
2bad8471 | 821 | { |
1dac06b2 | 822 | int n; |
531b1094 | 823 | char ext[32]; |
2bad8471 EVH |
824 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
825 | ||
826 | inode->i_nlink = 1; | |
827 | ||
531b1094 LI |
828 | inode->i_atime.tv_sec = stat->atime; |
829 | inode->i_mtime.tv_sec = stat->mtime; | |
830 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 831 | |
bd32b82d LI |
832 | inode->i_uid = v9ses->dfltuid; |
833 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 834 | |
2405669b | 835 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
836 | inode->i_uid = stat->n_uid; |
837 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
838 | } |
839 | ||
531b1094 | 840 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
841 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
842 | char type = 0; | |
843 | int major = -1; | |
844 | int minor = -1; | |
531b1094 | 845 | |
1dac06b2 LI |
846 | n = stat->extension.len; |
847 | if (n > sizeof(ext)-1) | |
848 | n = sizeof(ext)-1; | |
849 | memmove(ext, stat->extension.str, n); | |
850 | ext[n] = 0; | |
531b1094 | 851 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
852 | switch (type) { |
853 | case 'c': | |
854 | inode->i_mode &= ~S_IFBLK; | |
855 | inode->i_mode |= S_IFCHR; | |
856 | break; | |
857 | case 'b': | |
858 | break; | |
859 | default: | |
bd238fb4 LI |
860 | P9_DPRINTK(P9_DEBUG_ERROR, |
861 | "Unknown special type %c (%.*s)\n", type, | |
862 | stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
863 | }; |
864 | inode->i_rdev = MKDEV(major, minor); | |
865 | } else | |
866 | inode->i_rdev = 0; | |
867 | ||
531b1094 | 868 | inode->i_size = stat->length; |
2bad8471 | 869 | |
bd238fb4 LI |
870 | /* not real number of blocks, but 512 byte ones ... */ |
871 | inode->i_blocks = (inode->i_size + 512 - 1) >> 9; | |
2bad8471 EVH |
872 | } |
873 | ||
874 | /** | |
875 | * v9fs_qid2ino - convert qid into inode number | |
876 | * @qid: qid to hash | |
877 | * | |
878 | * BUG: potential for inode number collisions? | |
879 | */ | |
880 | ||
bd238fb4 | 881 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
882 | { |
883 | u64 path = qid->path + 2; | |
884 | ino_t i = 0; | |
885 | ||
886 | if (sizeof(ino_t) == sizeof(path)) | |
887 | memcpy(&i, &path, sizeof(ino_t)); | |
888 | else | |
889 | i = (ino_t) (path ^ (path >> 32)); | |
890 | ||
891 | return i; | |
892 | } | |
893 | ||
2bad8471 EVH |
894 | /** |
895 | * v9fs_readlink - read a symlink's location (internal version) | |
896 | * @dentry: dentry for symlink | |
73c592b9 | 897 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
898 | * @buflen: length of buffer |
899 | * | |
900 | */ | |
901 | ||
902 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
903 | { | |
bd238fb4 | 904 | int retval; |
2bad8471 | 905 | |
bd238fb4 LI |
906 | struct v9fs_session_info *v9ses; |
907 | struct p9_fid *fid; | |
908 | struct p9_stat *st; | |
2bad8471 | 909 | |
bd238fb4 LI |
910 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
911 | retval = -EPERM; | |
912 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
913 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 914 | if (IS_ERR(fid)) |
da977b2c | 915 | return PTR_ERR(fid); |
2bad8471 | 916 | |
2405669b | 917 | if (!v9fs_extended(v9ses)) |
bd238fb4 | 918 | return -EBADF; |
2bad8471 | 919 | |
bd238fb4 LI |
920 | st = p9_client_stat(fid); |
921 | if (IS_ERR(st)) | |
922 | return PTR_ERR(st); | |
2bad8471 | 923 | |
bd238fb4 | 924 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 925 | retval = -EINVAL; |
bd238fb4 | 926 | goto done; |
2bad8471 EVH |
927 | } |
928 | ||
929 | /* copy extension buffer into buffer */ | |
bd238fb4 LI |
930 | if (st->extension.len < buflen) |
931 | buflen = st->extension.len + 1; | |
2bad8471 | 932 | |
bd238fb4 | 933 | memmove(buffer, st->extension.str, buflen - 1); |
531b1094 | 934 | buffer[buflen-1] = 0; |
2bad8471 | 935 | |
bd238fb4 LI |
936 | P9_DPRINTK(P9_DEBUG_VFS, |
937 | "%s -> %.*s (%s)\n", dentry->d_name.name, st->extension.len, | |
938 | st->extension.str, buffer); | |
2bad8471 | 939 | |
bd238fb4 | 940 | retval = buflen; |
da977b2c | 941 | |
bd238fb4 LI |
942 | done: |
943 | kfree(st); | |
2bad8471 EVH |
944 | return retval; |
945 | } | |
946 | ||
947 | /** | |
948 | * v9fs_vfs_readlink - read a symlink's location | |
949 | * @dentry: dentry for symlink | |
ee443996 | 950 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
951 | * @buflen: length of buffer |
952 | * | |
953 | */ | |
954 | ||
955 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
956 | int buflen) | |
957 | { | |
958 | int retval; | |
959 | int ret; | |
960 | char *link = __getname(); | |
961 | ||
0710d36a FM |
962 | if (unlikely(!link)) |
963 | return -ENOMEM; | |
964 | ||
a1f9d8d2 LI |
965 | if (buflen > PATH_MAX) |
966 | buflen = PATH_MAX; | |
2bad8471 | 967 | |
bd238fb4 | 968 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
2bad8471 EVH |
969 | |
970 | retval = v9fs_readlink(dentry, link, buflen); | |
971 | ||
972 | if (retval > 0) { | |
973 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
bd238fb4 LI |
974 | P9_DPRINTK(P9_DEBUG_ERROR, |
975 | "problem copying to user: %d\n", ret); | |
2bad8471 EVH |
976 | retval = ret; |
977 | } | |
978 | } | |
979 | ||
ce44eeb6 | 980 | __putname(link); |
2bad8471 EVH |
981 | return retval; |
982 | } | |
983 | ||
984 | /** | |
985 | * v9fs_vfs_follow_link - follow a symlink path | |
986 | * @dentry: dentry for symlink | |
987 | * @nd: nameidata | |
988 | * | |
989 | */ | |
990 | ||
991 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
992 | { | |
993 | int len = 0; | |
994 | char *link = __getname(); | |
995 | ||
bd238fb4 | 996 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
997 | |
998 | if (!link) | |
999 | link = ERR_PTR(-ENOMEM); | |
1000 | else { | |
16cce6d2 | 1001 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1002 | |
1003 | if (len < 0) { | |
ce44eeb6 | 1004 | __putname(link); |
2bad8471 EVH |
1005 | link = ERR_PTR(len); |
1006 | } else | |
1007 | link[len] = 0; | |
1008 | } | |
1009 | nd_set_link(nd, link); | |
1010 | ||
1011 | return NULL; | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * v9fs_vfs_put_link - release a symlink path | |
1016 | * @dentry: dentry for symlink | |
1017 | * @nd: nameidata | |
ee443996 | 1018 | * @p: unused |
2bad8471 EVH |
1019 | * |
1020 | */ | |
1021 | ||
ee443996 EVH |
1022 | static void |
1023 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1024 | { |
1025 | char *s = nd_get_link(nd); | |
1026 | ||
bd238fb4 | 1027 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); |
2bad8471 | 1028 | if (!IS_ERR(s)) |
ce44eeb6 | 1029 | __putname(s); |
2bad8471 EVH |
1030 | } |
1031 | ||
ee443996 EVH |
1032 | /** |
1033 | * v9fs_vfs_mkspecial - create a special file | |
1034 | * @dir: inode to create special file in | |
1035 | * @dentry: dentry to create | |
1036 | * @mode: mode to create special file | |
1037 | * @extension: 9p2000.u format extension string representing special file | |
1038 | * | |
1039 | */ | |
1040 | ||
531b1094 LI |
1041 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1042 | int mode, const char *extension) | |
2bad8471 | 1043 | { |
bd238fb4 | 1044 | u32 perm; |
531b1094 | 1045 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1046 | struct p9_fid *fid; |
2bad8471 | 1047 | |
6a3124a3 | 1048 | v9ses = v9fs_inode2v9ses(dir); |
2405669b | 1049 | if (!v9fs_extended(v9ses)) { |
bd238fb4 | 1050 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1051 | return -EPERM; |
2bad8471 EVH |
1052 | } |
1053 | ||
da977b2c | 1054 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1055 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1056 | P9_OREAD); | |
1057 | if (IS_ERR(fid)) | |
1058 | return PTR_ERR(fid); | |
da977b2c | 1059 | |
bd238fb4 | 1060 | p9_client_clunk(fid); |
6a3124a3 | 1061 | return 0; |
531b1094 LI |
1062 | } |
1063 | ||
1064 | /** | |
1065 | * v9fs_vfs_symlink - helper function to create symlinks | |
1066 | * @dir: directory inode containing symlink | |
1067 | * @dentry: dentry for symlink | |
1068 | * @symname: symlink data | |
1069 | * | |
ee443996 | 1070 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1071 | * |
1072 | */ | |
1073 | ||
1074 | static int | |
1075 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1076 | { | |
bd238fb4 LI |
1077 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1078 | dentry->d_name.name, symname); | |
531b1094 LI |
1079 | |
1080 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * v9fs_vfs_link - create a hardlink | |
1085 | * @old_dentry: dentry for file to link to | |
1086 | * @dir: inode destination for new link | |
1087 | * @dentry: dentry for link | |
1088 | * | |
1089 | */ | |
1090 | ||
531b1094 LI |
1091 | static int |
1092 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1093 | struct dentry *dentry) | |
1094 | { | |
1095 | int retval; | |
bd238fb4 | 1096 | struct p9_fid *oldfid; |
531b1094 LI |
1097 | char *name; |
1098 | ||
bd238fb4 LI |
1099 | P9_DPRINTK(P9_DEBUG_VFS, |
1100 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1101 | old_dentry->d_name.name); |
1102 | ||
da977b2c | 1103 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1104 | if (IS_ERR(oldfid)) |
da977b2c | 1105 | return PTR_ERR(oldfid); |
531b1094 LI |
1106 | |
1107 | name = __getname(); | |
da977b2c EVH |
1108 | if (unlikely(!name)) { |
1109 | retval = -ENOMEM; | |
1110 | goto clunk_fid; | |
1111 | } | |
0710d36a | 1112 | |
16cce6d2 | 1113 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1114 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1115 | __putname(name); |
2bad8471 | 1116 | |
da977b2c | 1117 | clunk_fid: |
bd238fb4 | 1118 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1119 | return retval; |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * v9fs_vfs_mknod - create a special file | |
1124 | * @dir: inode destination for new link | |
1125 | * @dentry: dentry for file | |
1126 | * @mode: mode for creation | |
ee443996 | 1127 | * @rdev: device associated with special file |
2bad8471 EVH |
1128 | * |
1129 | */ | |
1130 | ||
1131 | static int | |
1132 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1133 | { | |
531b1094 LI |
1134 | int retval; |
1135 | char *name; | |
2bad8471 | 1136 | |
bd238fb4 LI |
1137 | P9_DPRINTK(P9_DEBUG_VFS, |
1138 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1139 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1140 | ||
531b1094 LI |
1141 | if (!new_valid_dev(rdev)) |
1142 | return -EINVAL; | |
2bad8471 | 1143 | |
531b1094 | 1144 | name = __getname(); |
c0291a05 ET |
1145 | if (!name) |
1146 | return -ENOMEM; | |
2bad8471 EVH |
1147 | /* build extension */ |
1148 | if (S_ISBLK(mode)) | |
531b1094 | 1149 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1150 | else if (S_ISCHR(mode)) |
531b1094 | 1151 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1152 | else if (S_ISFIFO(mode)) |
531b1094 | 1153 | *name = 0; |
2bad8471 | 1154 | else { |
531b1094 LI |
1155 | __putname(name); |
1156 | return -EINVAL; | |
2bad8471 EVH |
1157 | } |
1158 | ||
531b1094 LI |
1159 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1160 | __putname(name); | |
2bad8471 EVH |
1161 | |
1162 | return retval; | |
1163 | } | |
1164 | ||
754661f1 | 1165 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1166 | .create = v9fs_vfs_create, |
1167 | .lookup = v9fs_vfs_lookup, | |
1168 | .symlink = v9fs_vfs_symlink, | |
1169 | .link = v9fs_vfs_link, | |
1170 | .unlink = v9fs_vfs_unlink, | |
1171 | .mkdir = v9fs_vfs_mkdir, | |
1172 | .rmdir = v9fs_vfs_rmdir, | |
1173 | .mknod = v9fs_vfs_mknod, | |
1174 | .rename = v9fs_vfs_rename, | |
1175 | .readlink = v9fs_vfs_readlink, | |
1176 | .getattr = v9fs_vfs_getattr, | |
1177 | .setattr = v9fs_vfs_setattr, | |
1178 | }; | |
1179 | ||
754661f1 | 1180 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1181 | .create = v9fs_vfs_create, |
1182 | .lookup = v9fs_vfs_lookup, | |
1183 | .unlink = v9fs_vfs_unlink, | |
1184 | .mkdir = v9fs_vfs_mkdir, | |
1185 | .rmdir = v9fs_vfs_rmdir, | |
1186 | .mknod = v9fs_vfs_mknod, | |
1187 | .rename = v9fs_vfs_rename, | |
1188 | .getattr = v9fs_vfs_getattr, | |
1189 | .setattr = v9fs_vfs_setattr, | |
1190 | }; | |
1191 | ||
754661f1 | 1192 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1193 | .getattr = v9fs_vfs_getattr, |
1194 | .setattr = v9fs_vfs_setattr, | |
1195 | }; | |
1196 | ||
754661f1 | 1197 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1198 | .readlink = v9fs_vfs_readlink, |
1199 | .follow_link = v9fs_vfs_follow_link, | |
1200 | .put_link = v9fs_vfs_put_link, | |
1201 | .getattr = v9fs_vfs_getattr, | |
1202 | .setattr = v9fs_vfs_setattr, | |
1203 | }; |