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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 <[email protected]> | |
7 | * Copyright (C) 2002 by Ron Minnich <[email protected]> | |
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; | |
51a87c55 | 337 | struct p9_wstat *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 | |
51a87c55 EVH |
420 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
421 | ||
bd238fb4 LI |
422 | err = 0; |
423 | ofid = NULL; | |
424 | fid = NULL; | |
425 | name = (char *) dentry->d_name.name; | |
da977b2c | 426 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 427 | if (IS_ERR(dfid)) { |
da977b2c | 428 | err = PTR_ERR(dfid); |
51a87c55 | 429 | P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); |
bd238fb4 | 430 | dfid = NULL; |
da977b2c EVH |
431 | goto error; |
432 | } | |
6a3124a3 | 433 | |
bd238fb4 LI |
434 | /* clone a fid to use for creation */ |
435 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
436 | if (IS_ERR(ofid)) { | |
437 | err = PTR_ERR(ofid); | |
51a87c55 | 438 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 LI |
439 | ofid = NULL; |
440 | goto error; | |
441 | } | |
6a3124a3 | 442 | |
bd238fb4 | 443 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
444 | if (err < 0) { |
445 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 446 | goto error; |
51a87c55 | 447 | } |
6a3124a3 | 448 | |
bd238fb4 LI |
449 | /* now walk from the parent so we can get unopened fid */ |
450 | fid = p9_client_walk(dfid, 1, &name, 0); | |
451 | if (IS_ERR(fid)) { | |
452 | err = PTR_ERR(fid); | |
51a87c55 | 453 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 454 | fid = NULL; |
6a3124a3 | 455 | goto error; |
bd238fb4 LI |
456 | } else |
457 | dfid = NULL; | |
6a3124a3 | 458 | |
bd238fb4 LI |
459 | /* instantiate inode and assign the unopened fid to the dentry */ |
460 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
461 | if (IS_ERR(inode)) { |
462 | err = PTR_ERR(inode); | |
51a87c55 | 463 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
464 | goto error; |
465 | } | |
466 | ||
ba17674f | 467 | if (v9ses->cache) |
e03abc0c EVH |
468 | dentry->d_op = &v9fs_cached_dentry_operations; |
469 | else | |
470 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 471 | |
6a3124a3 | 472 | d_instantiate(dentry, inode); |
bd238fb4 LI |
473 | v9fs_fid_add(dentry, fid); |
474 | return ofid; | |
6a3124a3 | 475 | |
bd238fb4 LI |
476 | error: |
477 | if (dfid) | |
478 | p9_client_clunk(dfid); | |
479 | ||
480 | if (ofid) | |
481 | p9_client_clunk(ofid); | |
482 | ||
483 | if (fid) | |
484 | p9_client_clunk(fid); | |
485 | ||
486 | return ERR_PTR(err); | |
487 | } | |
488 | ||
489 | /** | |
490 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 491 | * @dir: directory inode that is being created |
bd238fb4 LI |
492 | * @dentry: dentry that is being deleted |
493 | * @mode: create permissions | |
494 | * @nd: path information | |
495 | * | |
496 | */ | |
6a3124a3 | 497 | |
bd238fb4 LI |
498 | static int |
499 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
500 | struct nameidata *nd) | |
501 | { | |
502 | int err; | |
503 | u32 perm; | |
504 | int flags; | |
505 | struct v9fs_session_info *v9ses; | |
506 | struct p9_fid *fid; | |
507 | struct file *filp; | |
508 | ||
509 | err = 0; | |
510 | fid = NULL; | |
511 | v9ses = v9fs_inode2v9ses(dir); | |
512 | perm = unixmode2p9mode(v9ses, mode); | |
513 | if (nd && nd->flags & LOOKUP_OPEN) | |
514 | flags = nd->intent.open.flags - 1; | |
515 | else | |
516 | flags = O_RDWR; | |
517 | ||
518 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
2e4bef41 | 519 | v9fs_uflags2omode(flags, v9fs_extended(v9ses))); |
bd238fb4 LI |
520 | if (IS_ERR(fid)) { |
521 | err = PTR_ERR(fid); | |
522 | fid = NULL; | |
523 | goto error; | |
524 | } | |
525 | ||
526 | /* if we are opening a file, assign the open fid to the file */ | |
527 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
528 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
529 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
530 | err = PTR_ERR(filp); |
531 | goto error; | |
6a3124a3 LI |
532 | } |
533 | ||
bd238fb4 LI |
534 | filp->private_data = fid; |
535 | } else | |
536 | p9_client_clunk(fid); | |
6a3124a3 LI |
537 | |
538 | return 0; | |
539 | ||
540 | error: | |
bd238fb4 LI |
541 | if (fid) |
542 | p9_client_clunk(fid); | |
6a3124a3 | 543 | |
6a3124a3 | 544 | return err; |
2bad8471 EVH |
545 | } |
546 | ||
547 | /** | |
548 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 549 | * @dir: inode that is being unlinked |
2bad8471 EVH |
550 | * @dentry: dentry that is being unlinked |
551 | * @mode: mode for new directory | |
552 | * | |
553 | */ | |
554 | ||
6a3124a3 | 555 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 556 | { |
6a3124a3 | 557 | int err; |
bd238fb4 | 558 | u32 perm; |
6a3124a3 | 559 | struct v9fs_session_info *v9ses; |
bd238fb4 | 560 | struct p9_fid *fid; |
6a3124a3 | 561 | |
bd238fb4 LI |
562 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
563 | err = 0; | |
6a3124a3 | 564 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 565 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
566 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
567 | if (IS_ERR(fid)) { | |
568 | err = PTR_ERR(fid); | |
569 | fid = NULL; | |
6a3124a3 LI |
570 | } |
571 | ||
bd238fb4 LI |
572 | if (fid) |
573 | p9_client_clunk(fid); | |
6a3124a3 | 574 | |
6a3124a3 | 575 | return err; |
2bad8471 EVH |
576 | } |
577 | ||
578 | /** | |
579 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
580 | * @dir: inode that is being walked from | |
581 | * @dentry: dentry that is being walked to? | |
582 | * @nameidata: path data | |
583 | * | |
584 | */ | |
585 | ||
586 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
587 | struct nameidata *nameidata) | |
588 | { | |
589 | struct super_block *sb; | |
590 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 591 | struct p9_fid *dfid, *fid; |
2bad8471 | 592 | struct inode *inode; |
bd238fb4 | 593 | char *name; |
2bad8471 EVH |
594 | int result = 0; |
595 | ||
bd238fb4 | 596 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 597 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
598 | |
599 | sb = dir->i_sb; | |
600 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
601 | dfid = v9fs_fid_lookup(dentry->d_parent); |
602 | if (IS_ERR(dfid)) | |
e231c2ee | 603 | return ERR_CAST(dfid); |
bd238fb4 LI |
604 | |
605 | name = (char *) dentry->d_name.name; | |
606 | fid = p9_client_walk(dfid, 1, &name, 1); | |
607 | if (IS_ERR(fid)) { | |
608 | result = PTR_ERR(fid); | |
2bad8471 EVH |
609 | if (result == -ENOENT) { |
610 | d_add(dentry, NULL); | |
2bad8471 EVH |
611 | return NULL; |
612 | } | |
2bad8471 | 613 | |
bd238fb4 | 614 | return ERR_PTR(result); |
2bad8471 EVH |
615 | } |
616 | ||
bd238fb4 LI |
617 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
618 | if (IS_ERR(inode)) { | |
619 | result = PTR_ERR(inode); | |
620 | inode = NULL; | |
621 | goto error; | |
2bad8471 EVH |
622 | } |
623 | ||
bd238fb4 | 624 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 625 | if (result < 0) |
bd238fb4 | 626 | goto error; |
6a3124a3 | 627 | |
ba17674f | 628 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
629 | dentry->d_op = &v9fs_cached_dentry_operations; |
630 | else | |
631 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
632 | |
633 | d_add(dentry, inode); | |
2bad8471 EVH |
634 | return NULL; |
635 | ||
bd238fb4 | 636 | error: |
62aa528e | 637 | p9_client_clunk(fid); |
da977b2c | 638 | |
2bad8471 EVH |
639 | return ERR_PTR(result); |
640 | } | |
641 | ||
642 | /** | |
643 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
644 | * @i: inode that is being unlinked | |
73c592b9 | 645 | * @d: dentry that is being unlinked |
2bad8471 EVH |
646 | * |
647 | */ | |
648 | ||
649 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
650 | { | |
651 | return v9fs_remove(i, d, 0); | |
652 | } | |
653 | ||
654 | /** | |
655 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
656 | * @i: inode that is being unlinked | |
73c592b9 | 657 | * @d: dentry that is being unlinked |
2bad8471 EVH |
658 | * |
659 | */ | |
660 | ||
661 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
662 | { | |
663 | return v9fs_remove(i, d, 1); | |
664 | } | |
665 | ||
666 | /** | |
667 | * v9fs_vfs_rename - VFS hook to rename an inode | |
668 | * @old_dir: old dir inode | |
669 | * @old_dentry: old dentry | |
670 | * @new_dir: new dir inode | |
671 | * @new_dentry: new dentry | |
672 | * | |
673 | */ | |
674 | ||
675 | static int | |
676 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
677 | struct inode *new_dir, struct dentry *new_dentry) | |
678 | { | |
bd238fb4 LI |
679 | struct inode *old_inode; |
680 | struct v9fs_session_info *v9ses; | |
681 | struct p9_fid *oldfid; | |
682 | struct p9_fid *olddirfid; | |
683 | struct p9_fid *newdirfid; | |
684 | struct p9_wstat wstat; | |
685 | int retval; | |
2bad8471 | 686 | |
bd238fb4 LI |
687 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
688 | retval = 0; | |
689 | old_inode = old_dentry->d_inode; | |
690 | v9ses = v9fs_inode2v9ses(old_inode); | |
691 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 692 | if (IS_ERR(oldfid)) |
da977b2c EVH |
693 | return PTR_ERR(oldfid); |
694 | ||
695 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 696 | if (IS_ERR(olddirfid)) { |
da977b2c | 697 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 698 | goto done; |
da977b2c EVH |
699 | } |
700 | ||
701 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 702 | if (IS_ERR(newdirfid)) { |
da977b2c | 703 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 704 | goto clunk_olddir; |
2bad8471 EVH |
705 | } |
706 | ||
707 | /* 9P can only handle file rename in the same directory */ | |
708 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
709 | P9_DPRINTK(P9_DEBUG_ERROR, |
710 | "old dir and new dir are different\n"); | |
621997cd | 711 | retval = -EXDEV; |
bd238fb4 | 712 | goto clunk_newdir; |
2bad8471 EVH |
713 | } |
714 | ||
531b1094 | 715 | v9fs_blank_wstat(&wstat); |
ba17674f | 716 | wstat.muid = v9ses->uname; |
531b1094 | 717 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 718 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 719 | |
bd238fb4 | 720 | clunk_newdir: |
22150c4f | 721 | p9_client_clunk(newdirfid); |
2bad8471 | 722 | |
bd238fb4 | 723 | clunk_olddir: |
22150c4f | 724 | p9_client_clunk(olddirfid); |
da977b2c | 725 | |
bd238fb4 | 726 | done: |
2bad8471 EVH |
727 | return retval; |
728 | } | |
729 | ||
730 | /** | |
943ffb58 | 731 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
732 | * @mnt: mount information |
733 | * @dentry: file to get attributes on | |
734 | * @stat: metadata structure to populate | |
2bad8471 EVH |
735 | * |
736 | */ | |
737 | ||
738 | static int | |
739 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
740 | struct kstat *stat) | |
741 | { | |
bd238fb4 LI |
742 | int err; |
743 | struct v9fs_session_info *v9ses; | |
744 | struct p9_fid *fid; | |
51a87c55 | 745 | struct p9_wstat *st; |
bd238fb4 LI |
746 | |
747 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
748 | err = -EPERM; | |
749 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
9523a841 EVH |
750 | if (v9ses->cache == CACHE_LOOSE) |
751 | return simple_getattr(mnt, dentry, stat); | |
752 | ||
bd238fb4 LI |
753 | fid = v9fs_fid_lookup(dentry); |
754 | if (IS_ERR(fid)) | |
da977b2c | 755 | return PTR_ERR(fid); |
2bad8471 | 756 | |
bd238fb4 LI |
757 | st = p9_client_stat(fid); |
758 | if (IS_ERR(st)) | |
759 | return PTR_ERR(st); | |
2bad8471 | 760 | |
bd238fb4 | 761 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 762 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 763 | |
bd238fb4 LI |
764 | kfree(st); |
765 | return 0; | |
2bad8471 EVH |
766 | } |
767 | ||
768 | /** | |
769 | * v9fs_vfs_setattr - set file metadata | |
770 | * @dentry: file whose metadata to set | |
771 | * @iattr: metadata assignment structure | |
772 | * | |
773 | */ | |
774 | ||
775 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
776 | { | |
bd238fb4 LI |
777 | int retval; |
778 | struct v9fs_session_info *v9ses; | |
779 | struct p9_fid *fid; | |
780 | struct p9_wstat wstat; | |
2bad8471 | 781 | |
bd238fb4 LI |
782 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
783 | retval = -EPERM; | |
784 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
785 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
786 | if(IS_ERR(fid)) |
787 | return PTR_ERR(fid); | |
2bad8471 | 788 | |
531b1094 | 789 | v9fs_blank_wstat(&wstat); |
2bad8471 | 790 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 791 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
792 | |
793 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 794 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
795 | |
796 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 797 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
798 | |
799 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 800 | wstat.length = iattr->ia_size; |
2bad8471 | 801 | |
2405669b | 802 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
803 | if (iattr->ia_valid & ATTR_UID) |
804 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 805 | |
531b1094 LI |
806 | if (iattr->ia_valid & ATTR_GID) |
807 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
808 | } |
809 | ||
bd238fb4 LI |
810 | retval = p9_client_wstat(fid, &wstat); |
811 | if (retval >= 0) | |
812 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 813 | |
bd238fb4 | 814 | return retval; |
2bad8471 EVH |
815 | } |
816 | ||
817 | /** | |
531b1094 LI |
818 | * v9fs_stat2inode - populate an inode structure with mistat info |
819 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
820 | * @inode: inode to populate |
821 | * @sb: superblock of filesystem | |
822 | * | |
823 | */ | |
824 | ||
825 | void | |
51a87c55 | 826 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 827 | struct super_block *sb) |
2bad8471 | 828 | { |
531b1094 | 829 | char ext[32]; |
2bad8471 EVH |
830 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
831 | ||
832 | inode->i_nlink = 1; | |
833 | ||
531b1094 LI |
834 | inode->i_atime.tv_sec = stat->atime; |
835 | inode->i_mtime.tv_sec = stat->mtime; | |
836 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 837 | |
bd32b82d LI |
838 | inode->i_uid = v9ses->dfltuid; |
839 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 840 | |
2405669b | 841 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
842 | inode->i_uid = stat->n_uid; |
843 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
844 | } |
845 | ||
531b1094 | 846 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
847 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
848 | char type = 0; | |
849 | int major = -1; | |
850 | int minor = -1; | |
531b1094 | 851 | |
51a87c55 | 852 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 853 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
854 | switch (type) { |
855 | case 'c': | |
856 | inode->i_mode &= ~S_IFBLK; | |
857 | inode->i_mode |= S_IFCHR; | |
858 | break; | |
859 | case 'b': | |
860 | break; | |
861 | default: | |
bd238fb4 | 862 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
863 | "Unknown special type %c %s\n", type, |
864 | stat->extension); | |
2bad8471 EVH |
865 | }; |
866 | inode->i_rdev = MKDEV(major, minor); | |
867 | } else | |
868 | inode->i_rdev = 0; | |
869 | ||
531b1094 | 870 | inode->i_size = stat->length; |
2bad8471 | 871 | |
bd238fb4 LI |
872 | /* not real number of blocks, but 512 byte ones ... */ |
873 | inode->i_blocks = (inode->i_size + 512 - 1) >> 9; | |
2bad8471 EVH |
874 | } |
875 | ||
876 | /** | |
877 | * v9fs_qid2ino - convert qid into inode number | |
878 | * @qid: qid to hash | |
879 | * | |
880 | * BUG: potential for inode number collisions? | |
881 | */ | |
882 | ||
bd238fb4 | 883 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
884 | { |
885 | u64 path = qid->path + 2; | |
886 | ino_t i = 0; | |
887 | ||
888 | if (sizeof(ino_t) == sizeof(path)) | |
889 | memcpy(&i, &path, sizeof(ino_t)); | |
890 | else | |
891 | i = (ino_t) (path ^ (path >> 32)); | |
892 | ||
893 | return i; | |
894 | } | |
895 | ||
2bad8471 EVH |
896 | /** |
897 | * v9fs_readlink - read a symlink's location (internal version) | |
898 | * @dentry: dentry for symlink | |
73c592b9 | 899 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
900 | * @buflen: length of buffer |
901 | * | |
902 | */ | |
903 | ||
904 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
905 | { | |
bd238fb4 | 906 | int retval; |
2bad8471 | 907 | |
bd238fb4 LI |
908 | struct v9fs_session_info *v9ses; |
909 | struct p9_fid *fid; | |
51a87c55 | 910 | struct p9_wstat *st; |
2bad8471 | 911 | |
bd238fb4 LI |
912 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
913 | retval = -EPERM; | |
914 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
915 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 916 | if (IS_ERR(fid)) |
da977b2c | 917 | return PTR_ERR(fid); |
2bad8471 | 918 | |
2405669b | 919 | if (!v9fs_extended(v9ses)) |
bd238fb4 | 920 | return -EBADF; |
2bad8471 | 921 | |
bd238fb4 LI |
922 | st = p9_client_stat(fid); |
923 | if (IS_ERR(st)) | |
924 | return PTR_ERR(st); | |
2bad8471 | 925 | |
bd238fb4 | 926 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 927 | retval = -EINVAL; |
bd238fb4 | 928 | goto done; |
2bad8471 EVH |
929 | } |
930 | ||
931 | /* copy extension buffer into buffer */ | |
51a87c55 | 932 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 933 | |
bd238fb4 | 934 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 935 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 936 | |
bd238fb4 | 937 | retval = buflen; |
da977b2c | 938 | |
bd238fb4 LI |
939 | done: |
940 | kfree(st); | |
2bad8471 EVH |
941 | return retval; |
942 | } | |
943 | ||
944 | /** | |
945 | * v9fs_vfs_readlink - read a symlink's location | |
946 | * @dentry: dentry for symlink | |
ee443996 | 947 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
948 | * @buflen: length of buffer |
949 | * | |
950 | */ | |
951 | ||
952 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
953 | int buflen) | |
954 | { | |
955 | int retval; | |
956 | int ret; | |
957 | char *link = __getname(); | |
958 | ||
0710d36a FM |
959 | if (unlikely(!link)) |
960 | return -ENOMEM; | |
961 | ||
a1f9d8d2 LI |
962 | if (buflen > PATH_MAX) |
963 | buflen = PATH_MAX; | |
2bad8471 | 964 | |
bd238fb4 | 965 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
2bad8471 EVH |
966 | |
967 | retval = v9fs_readlink(dentry, link, buflen); | |
968 | ||
969 | if (retval > 0) { | |
970 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
bd238fb4 LI |
971 | P9_DPRINTK(P9_DEBUG_ERROR, |
972 | "problem copying to user: %d\n", ret); | |
2bad8471 EVH |
973 | retval = ret; |
974 | } | |
975 | } | |
976 | ||
ce44eeb6 | 977 | __putname(link); |
2bad8471 EVH |
978 | return retval; |
979 | } | |
980 | ||
981 | /** | |
982 | * v9fs_vfs_follow_link - follow a symlink path | |
983 | * @dentry: dentry for symlink | |
984 | * @nd: nameidata | |
985 | * | |
986 | */ | |
987 | ||
988 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
989 | { | |
990 | int len = 0; | |
991 | char *link = __getname(); | |
992 | ||
bd238fb4 | 993 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
994 | |
995 | if (!link) | |
996 | link = ERR_PTR(-ENOMEM); | |
997 | else { | |
16cce6d2 | 998 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
999 | |
1000 | if (len < 0) { | |
ce44eeb6 | 1001 | __putname(link); |
2bad8471 EVH |
1002 | link = ERR_PTR(len); |
1003 | } else | |
1004 | link[len] = 0; | |
1005 | } | |
1006 | nd_set_link(nd, link); | |
1007 | ||
1008 | return NULL; | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * v9fs_vfs_put_link - release a symlink path | |
1013 | * @dentry: dentry for symlink | |
1014 | * @nd: nameidata | |
ee443996 | 1015 | * @p: unused |
2bad8471 EVH |
1016 | * |
1017 | */ | |
1018 | ||
ee443996 EVH |
1019 | static void |
1020 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1021 | { |
1022 | char *s = nd_get_link(nd); | |
1023 | ||
bd238fb4 | 1024 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); |
2bad8471 | 1025 | if (!IS_ERR(s)) |
ce44eeb6 | 1026 | __putname(s); |
2bad8471 EVH |
1027 | } |
1028 | ||
ee443996 EVH |
1029 | /** |
1030 | * v9fs_vfs_mkspecial - create a special file | |
1031 | * @dir: inode to create special file in | |
1032 | * @dentry: dentry to create | |
1033 | * @mode: mode to create special file | |
1034 | * @extension: 9p2000.u format extension string representing special file | |
1035 | * | |
1036 | */ | |
1037 | ||
531b1094 LI |
1038 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1039 | int mode, const char *extension) | |
2bad8471 | 1040 | { |
bd238fb4 | 1041 | u32 perm; |
531b1094 | 1042 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1043 | struct p9_fid *fid; |
2bad8471 | 1044 | |
6a3124a3 | 1045 | v9ses = v9fs_inode2v9ses(dir); |
2405669b | 1046 | if (!v9fs_extended(v9ses)) { |
bd238fb4 | 1047 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1048 | return -EPERM; |
2bad8471 EVH |
1049 | } |
1050 | ||
da977b2c | 1051 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1052 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1053 | P9_OREAD); | |
1054 | if (IS_ERR(fid)) | |
1055 | return PTR_ERR(fid); | |
da977b2c | 1056 | |
bd238fb4 | 1057 | p9_client_clunk(fid); |
6a3124a3 | 1058 | return 0; |
531b1094 LI |
1059 | } |
1060 | ||
1061 | /** | |
1062 | * v9fs_vfs_symlink - helper function to create symlinks | |
1063 | * @dir: directory inode containing symlink | |
1064 | * @dentry: dentry for symlink | |
1065 | * @symname: symlink data | |
1066 | * | |
ee443996 | 1067 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1068 | * |
1069 | */ | |
1070 | ||
1071 | static int | |
1072 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1073 | { | |
bd238fb4 LI |
1074 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1075 | dentry->d_name.name, symname); | |
531b1094 LI |
1076 | |
1077 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1078 | } | |
1079 | ||
1080 | /** | |
1081 | * v9fs_vfs_link - create a hardlink | |
1082 | * @old_dentry: dentry for file to link to | |
1083 | * @dir: inode destination for new link | |
1084 | * @dentry: dentry for link | |
1085 | * | |
1086 | */ | |
1087 | ||
531b1094 LI |
1088 | static int |
1089 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1090 | struct dentry *dentry) | |
1091 | { | |
1092 | int retval; | |
bd238fb4 | 1093 | struct p9_fid *oldfid; |
531b1094 LI |
1094 | char *name; |
1095 | ||
bd238fb4 LI |
1096 | P9_DPRINTK(P9_DEBUG_VFS, |
1097 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1098 | old_dentry->d_name.name); |
1099 | ||
da977b2c | 1100 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1101 | if (IS_ERR(oldfid)) |
da977b2c | 1102 | return PTR_ERR(oldfid); |
531b1094 LI |
1103 | |
1104 | name = __getname(); | |
da977b2c EVH |
1105 | if (unlikely(!name)) { |
1106 | retval = -ENOMEM; | |
1107 | goto clunk_fid; | |
1108 | } | |
0710d36a | 1109 | |
16cce6d2 | 1110 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1111 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1112 | __putname(name); |
2bad8471 | 1113 | |
da977b2c | 1114 | clunk_fid: |
bd238fb4 | 1115 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1116 | return retval; |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * v9fs_vfs_mknod - create a special file | |
1121 | * @dir: inode destination for new link | |
1122 | * @dentry: dentry for file | |
1123 | * @mode: mode for creation | |
ee443996 | 1124 | * @rdev: device associated with special file |
2bad8471 EVH |
1125 | * |
1126 | */ | |
1127 | ||
1128 | static int | |
1129 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1130 | { | |
531b1094 LI |
1131 | int retval; |
1132 | char *name; | |
2bad8471 | 1133 | |
bd238fb4 LI |
1134 | P9_DPRINTK(P9_DEBUG_VFS, |
1135 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1136 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1137 | ||
531b1094 LI |
1138 | if (!new_valid_dev(rdev)) |
1139 | return -EINVAL; | |
2bad8471 | 1140 | |
531b1094 | 1141 | name = __getname(); |
c0291a05 ET |
1142 | if (!name) |
1143 | return -ENOMEM; | |
2bad8471 EVH |
1144 | /* build extension */ |
1145 | if (S_ISBLK(mode)) | |
531b1094 | 1146 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1147 | else if (S_ISCHR(mode)) |
531b1094 | 1148 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1149 | else if (S_ISFIFO(mode)) |
531b1094 | 1150 | *name = 0; |
2bad8471 | 1151 | else { |
531b1094 LI |
1152 | __putname(name); |
1153 | return -EINVAL; | |
2bad8471 EVH |
1154 | } |
1155 | ||
531b1094 LI |
1156 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1157 | __putname(name); | |
2bad8471 EVH |
1158 | |
1159 | return retval; | |
1160 | } | |
1161 | ||
754661f1 | 1162 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1163 | .create = v9fs_vfs_create, |
1164 | .lookup = v9fs_vfs_lookup, | |
1165 | .symlink = v9fs_vfs_symlink, | |
1166 | .link = v9fs_vfs_link, | |
1167 | .unlink = v9fs_vfs_unlink, | |
1168 | .mkdir = v9fs_vfs_mkdir, | |
1169 | .rmdir = v9fs_vfs_rmdir, | |
1170 | .mknod = v9fs_vfs_mknod, | |
1171 | .rename = v9fs_vfs_rename, | |
1172 | .readlink = v9fs_vfs_readlink, | |
1173 | .getattr = v9fs_vfs_getattr, | |
1174 | .setattr = v9fs_vfs_setattr, | |
1175 | }; | |
1176 | ||
754661f1 | 1177 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1178 | .create = v9fs_vfs_create, |
1179 | .lookup = v9fs_vfs_lookup, | |
1180 | .unlink = v9fs_vfs_unlink, | |
1181 | .mkdir = v9fs_vfs_mkdir, | |
1182 | .rmdir = v9fs_vfs_rmdir, | |
1183 | .mknod = v9fs_vfs_mknod, | |
1184 | .rename = v9fs_vfs_rename, | |
1185 | .getattr = v9fs_vfs_getattr, | |
1186 | .setattr = v9fs_vfs_setattr, | |
1187 | }; | |
1188 | ||
754661f1 | 1189 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1190 | .getattr = v9fs_vfs_getattr, |
1191 | .setattr = v9fs_vfs_setattr, | |
1192 | }; | |
1193 | ||
754661f1 | 1194 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1195 | .readlink = v9fs_vfs_readlink, |
1196 | .follow_link = v9fs_vfs_follow_link, | |
1197 | .put_link = v9fs_vfs_put_link, | |
1198 | .getattr = v9fs_vfs_getattr, | |
1199 | .setattr = v9fs_vfs_setattr, | |
1200 | }; |