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