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