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 | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to: | |
21 | * Free Software Foundation | |
22 | * 51 Franklin Street, Fifth Floor | |
23 | * Boston, MA 02111-1301 USA | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/stat.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/smp_lock.h> | |
35 | #include <linux/inet.h> | |
36 | #include <linux/namei.h> | |
37 | #include <linux/idr.h> | |
38 | ||
39 | #include "debug.h" | |
40 | #include "v9fs.h" | |
41 | #include "9p.h" | |
42 | #include "v9fs_vfs.h" | |
2bad8471 EVH |
43 | #include "fid.h" |
44 | ||
45 | static struct inode_operations v9fs_dir_inode_operations; | |
b501611a | 46 | static struct inode_operations v9fs_dir_inode_operations_ext; |
2bad8471 EVH |
47 | static struct inode_operations v9fs_file_inode_operations; |
48 | static struct inode_operations v9fs_symlink_inode_operations; | |
49 | ||
50 | /** | |
51 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
52 | * @v9ses: v9fs session information | |
53 | * @mode: mode to convert | |
54 | * | |
55 | */ | |
56 | ||
73c592b9 | 57 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
58 | { |
59 | int res; | |
60 | res = mode & 0777; | |
61 | if (S_ISDIR(mode)) | |
62 | res |= V9FS_DMDIR; | |
63 | if (v9ses->extended) { | |
64 | if (S_ISLNK(mode)) | |
65 | res |= V9FS_DMSYMLINK; | |
66 | if (v9ses->nodev == 0) { | |
67 | if (S_ISSOCK(mode)) | |
68 | res |= V9FS_DMSOCKET; | |
69 | if (S_ISFIFO(mode)) | |
70 | res |= V9FS_DMNAMEDPIPE; | |
71 | if (S_ISBLK(mode)) | |
72 | res |= V9FS_DMDEVICE; | |
73 | if (S_ISCHR(mode)) | |
74 | res |= V9FS_DMDEVICE; | |
75 | } | |
76 | ||
77 | if ((mode & S_ISUID) == S_ISUID) | |
78 | res |= V9FS_DMSETUID; | |
79 | if ((mode & S_ISGID) == S_ISGID) | |
80 | res |= V9FS_DMSETGID; | |
81 | if ((mode & V9FS_DMLINK)) | |
82 | res |= V9FS_DMLINK; | |
83 | } | |
84 | ||
85 | return res; | |
86 | } | |
87 | ||
88 | /** | |
89 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
90 | * @v9ses: v9fs session information | |
91 | * @mode: mode to convert | |
92 | * | |
93 | */ | |
94 | ||
73c592b9 | 95 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
96 | { |
97 | int res; | |
98 | ||
99 | res = mode & 0777; | |
100 | ||
101 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) | |
102 | res |= S_IFDIR; | |
103 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) | |
104 | res |= S_IFLNK; | |
105 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) | |
106 | && (v9ses->nodev == 0)) | |
107 | res |= S_IFSOCK; | |
108 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) | |
109 | && (v9ses->nodev == 0)) | |
110 | res |= S_IFIFO; | |
111 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) | |
112 | && (v9ses->nodev == 0)) | |
113 | res |= S_IFBLK; | |
114 | else | |
115 | res |= S_IFREG; | |
116 | ||
117 | if (v9ses->extended) { | |
118 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) | |
119 | res |= S_ISUID; | |
120 | ||
121 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) | |
122 | res |= S_ISGID; | |
123 | } | |
124 | ||
125 | return res; | |
126 | } | |
127 | ||
6a3124a3 LI |
128 | int v9fs_uflags2omode(int uflags) |
129 | { | |
130 | int ret; | |
131 | ||
132 | ret = 0; | |
133 | switch (uflags&3) { | |
134 | default: | |
135 | case O_RDONLY: | |
136 | ret = V9FS_OREAD; | |
137 | break; | |
138 | ||
139 | case O_WRONLY: | |
140 | ret = V9FS_OWRITE; | |
141 | break; | |
142 | ||
143 | case O_RDWR: | |
144 | ret = V9FS_ORDWR; | |
145 | break; | |
146 | } | |
147 | ||
148 | if (uflags & O_EXCL) | |
149 | ret |= V9FS_OEXCL; | |
150 | ||
151 | if (uflags & O_TRUNC) | |
152 | ret |= V9FS_OTRUNC; | |
153 | ||
154 | if (uflags & O_APPEND) | |
155 | ret |= V9FS_OAPPEND; | |
156 | ||
157 | return ret; | |
158 | } | |
159 | ||
2bad8471 | 160 | /** |
531b1094 | 161 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
2bad8471 | 162 | * @v9ses: 9P session info (for determining extended mode) |
531b1094 | 163 | * @wstat: structure to initialize |
2bad8471 EVH |
164 | * |
165 | */ | |
166 | ||
73c592b9 | 167 | static void |
531b1094 | 168 | v9fs_blank_wstat(struct v9fs_wstat *wstat) |
2bad8471 | 169 | { |
531b1094 LI |
170 | wstat->type = ~0; |
171 | wstat->dev = ~0; | |
172 | wstat->qid.type = ~0; | |
173 | wstat->qid.version = ~0; | |
174 | *((long long *)&wstat->qid.path) = ~0; | |
175 | wstat->mode = ~0; | |
176 | wstat->atime = ~0; | |
177 | wstat->mtime = ~0; | |
178 | wstat->length = ~0; | |
179 | wstat->name = NULL; | |
180 | wstat->uid = NULL; | |
181 | wstat->gid = NULL; | |
182 | wstat->muid = NULL; | |
183 | wstat->n_uid = ~0; | |
184 | wstat->n_gid = ~0; | |
185 | wstat->n_muid = ~0; | |
186 | wstat->extension = NULL; | |
2bad8471 EVH |
187 | } |
188 | ||
189 | /** | |
190 | * v9fs_get_inode - helper function to setup an inode | |
191 | * @sb: superblock | |
192 | * @mode: mode to setup inode with | |
193 | * | |
194 | */ | |
195 | ||
196 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
197 | { | |
6a3124a3 | 198 | struct inode *inode; |
b501611a | 199 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 EVH |
200 | |
201 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
202 | ||
203 | inode = new_inode(sb); | |
204 | if (inode) { | |
205 | inode->i_mode = mode; | |
206 | inode->i_uid = current->fsuid; | |
207 | inode->i_gid = current->fsgid; | |
208 | inode->i_blksize = sb->s_blocksize; | |
209 | inode->i_blocks = 0; | |
210 | inode->i_rdev = 0; | |
211 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
147b31cf | 212 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
2bad8471 EVH |
213 | |
214 | switch (mode & S_IFMT) { | |
215 | case S_IFIFO: | |
216 | case S_IFBLK: | |
217 | case S_IFCHR: | |
218 | case S_IFSOCK: | |
b501611a EVH |
219 | if(!v9ses->extended) { |
220 | dprintk(DEBUG_ERROR, "special files without extended mode\n"); | |
221 | return ERR_PTR(-EINVAL); | |
222 | } | |
5d58bec5 EVH |
223 | init_special_inode(inode, inode->i_mode, |
224 | inode->i_rdev); | |
225 | break; | |
2bad8471 EVH |
226 | case S_IFREG: |
227 | inode->i_op = &v9fs_file_inode_operations; | |
228 | inode->i_fop = &v9fs_file_operations; | |
229 | break; | |
b501611a EVH |
230 | case S_IFLNK: |
231 | if(!v9ses->extended) { | |
232 | dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); | |
233 | return ERR_PTR(-EINVAL); | |
234 | } | |
235 | inode->i_op = &v9fs_symlink_inode_operations; | |
236 | break; | |
2bad8471 EVH |
237 | case S_IFDIR: |
238 | inode->i_nlink++; | |
b501611a EVH |
239 | if(v9ses->extended) |
240 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
241 | else | |
242 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
243 | inode->i_fop = &v9fs_dir_operations; |
244 | break; | |
2bad8471 EVH |
245 | default: |
246 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
247 | mode, mode & S_IFMT); | |
248 | return ERR_PTR(-EINVAL); | |
249 | } | |
250 | } else { | |
251 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
252 | return ERR_PTR(-ENOMEM); | |
253 | } | |
254 | return inode; | |
255 | } | |
256 | ||
2bad8471 | 257 | static int |
16cce6d2 LI |
258 | v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, |
259 | u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) | |
2bad8471 | 260 | { |
6a3124a3 | 261 | u32 fid; |
3cf6429a | 262 | int err; |
6a3124a3 | 263 | struct v9fs_fcall *fcall; |
2bad8471 | 264 | |
6a3124a3 LI |
265 | fid = v9fs_get_idpool(&v9ses->fidpool); |
266 | if (fid < 0) { | |
2bad8471 | 267 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 268 | return -ENOSPC; |
2bad8471 EVH |
269 | } |
270 | ||
6a3124a3 LI |
271 | err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); |
272 | if (err < 0) { | |
531b1094 | 273 | PRINT_FCALL_ERROR("clone error", fcall); |
16cce6d2 | 274 | goto put_fid; |
2bad8471 | 275 | } |
2bad8471 EVH |
276 | kfree(fcall); |
277 | ||
16cce6d2 | 278 | err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall); |
6a3124a3 | 279 | if (err < 0) { |
531b1094 | 280 | PRINT_FCALL_ERROR("create fails", fcall); |
16cce6d2 | 281 | goto clunk_fid; |
2bad8471 EVH |
282 | } |
283 | ||
6a3124a3 LI |
284 | if (iounit) |
285 | *iounit = fcall->params.rcreate.iounit; | |
286 | ||
287 | if (qid) | |
288 | *qid = fcall->params.rcreate.qid; | |
289 | ||
290 | if (fidp) | |
291 | *fidp = fid; | |
292 | ||
2bad8471 | 293 | kfree(fcall); |
6a3124a3 | 294 | return 0; |
2bad8471 | 295 | |
16cce6d2 LI |
296 | clunk_fid: |
297 | v9fs_t_clunk(v9ses, fid); | |
298 | fid = V9FS_NOFID; | |
299 | ||
300 | put_fid: | |
6a3124a3 LI |
301 | if (fid >= 0) |
302 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
2bad8471 | 303 | |
6a3124a3 LI |
304 | kfree(fcall); |
305 | return err; | |
306 | } | |
0b8dd177 | 307 | |
6a3124a3 LI |
308 | static struct v9fs_fid* |
309 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
310 | { | |
311 | int err; | |
312 | u32 nfid; | |
313 | struct v9fs_fid *ret; | |
314 | struct v9fs_fcall *fcall; | |
315 | ||
316 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
317 | if (nfid < 0) { | |
0b8dd177 | 318 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 319 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
320 | } |
321 | ||
6a3124a3 LI |
322 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
323 | &fcall); | |
324 | ||
325 | if (err < 0) { | |
326 | PRINT_FCALL_ERROR("walk error", fcall); | |
327 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
328 | goto error; | |
0b8dd177 | 329 | } |
6a3124a3 | 330 | |
3cf6429a LI |
331 | kfree(fcall); |
332 | fcall = NULL; | |
6a3124a3 LI |
333 | ret = v9fs_fid_create(v9ses, nfid); |
334 | if (!ret) { | |
335 | err = -ENOMEM; | |
336 | goto clunk_fid; | |
337 | } | |
0b8dd177 | 338 | |
6a3124a3 LI |
339 | err = v9fs_fid_insert(ret, dentry); |
340 | if (err < 0) { | |
341 | v9fs_fid_destroy(ret); | |
342 | goto clunk_fid; | |
0b8dd177 | 343 | } |
2bad8471 | 344 | |
6a3124a3 | 345 | return ret; |
2bad8471 | 346 | |
6a3124a3 LI |
347 | clunk_fid: |
348 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 349 | |
6a3124a3 LI |
350 | error: |
351 | kfree(fcall); | |
352 | return ERR_PTR(err); | |
353 | } | |
2bad8471 | 354 | |
5174fdab | 355 | static struct inode * |
6a3124a3 LI |
356 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, |
357 | struct super_block *sb) | |
358 | { | |
359 | int err, umode; | |
360 | struct inode *ret; | |
361 | struct v9fs_fcall *fcall; | |
531b1094 | 362 | |
6a3124a3 LI |
363 | ret = NULL; |
364 | err = v9fs_t_stat(v9ses, fid, &fcall); | |
365 | if (err) { | |
366 | PRINT_FCALL_ERROR("stat error", fcall); | |
367 | goto error; | |
2bad8471 EVH |
368 | } |
369 | ||
6a3124a3 LI |
370 | umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); |
371 | ret = v9fs_get_inode(sb, umode); | |
372 | if (IS_ERR(ret)) { | |
373 | err = PTR_ERR(ret); | |
374 | ret = NULL; | |
375 | goto error; | |
376 | } | |
2bad8471 | 377 | |
6a3124a3 LI |
378 | v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); |
379 | kfree(fcall); | |
380 | return ret; | |
2bad8471 | 381 | |
6a3124a3 | 382 | error: |
2bad8471 | 383 | kfree(fcall); |
6a3124a3 LI |
384 | if (ret) |
385 | iput(ret); | |
2bad8471 | 386 | |
6a3124a3 | 387 | return ERR_PTR(err); |
2bad8471 EVH |
388 | } |
389 | ||
390 | /** | |
391 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
392 | * @dir: directory inode that is being deleted |
393 | * @file: dentry that is being deleted | |
394 | * @rmdir: removing a directory | |
2bad8471 EVH |
395 | * |
396 | */ | |
397 | ||
398 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
399 | { | |
400 | struct v9fs_fcall *fcall = NULL; | |
401 | struct super_block *sb = NULL; | |
402 | struct v9fs_session_info *v9ses = NULL; | |
403 | struct v9fs_fid *v9fid = NULL; | |
404 | struct inode *file_inode = NULL; | |
405 | int fid = -1; | |
406 | int result = 0; | |
407 | ||
408 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
409 | rmdir); | |
410 | ||
411 | file_inode = file->d_inode; | |
412 | sb = file_inode->i_sb; | |
413 | v9ses = v9fs_inode2v9ses(file_inode); | |
0b8dd177 | 414 | v9fid = v9fs_fid_lookup(file); |
2bad8471 EVH |
415 | |
416 | if (!v9fid) { | |
417 | dprintk(DEBUG_ERROR, | |
418 | "no v9fs_fid\n"); | |
419 | return -EBADF; | |
420 | } | |
421 | ||
422 | fid = v9fid->fid; | |
423 | if (fid < 0) { | |
424 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
425 | file_inode->i_ino); | |
426 | return -EBADF; | |
427 | } | |
428 | ||
429 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
531b1094 LI |
430 | if (result < 0) { |
431 | PRINT_FCALL_ERROR("remove fails", fcall); | |
432 | } else { | |
2bad8471 EVH |
433 | v9fs_put_idpool(fid, &v9ses->fidpool); |
434 | v9fs_fid_destroy(v9fid); | |
435 | } | |
436 | ||
437 | kfree(fcall); | |
438 | return result; | |
439 | } | |
440 | ||
6a3124a3 LI |
441 | static int |
442 | v9fs_open_created(struct inode *inode, struct file *file) | |
443 | { | |
444 | return 0; | |
445 | } | |
446 | ||
2bad8471 EVH |
447 | /** |
448 | * v9fs_vfs_create - VFS hook to create files | |
449 | * @inode: directory inode that is being deleted | |
450 | * @dentry: dentry that is being deleted | |
6a3124a3 | 451 | * @mode: create permissions |
2bad8471 EVH |
452 | * @nd: path information |
453 | * | |
454 | */ | |
455 | ||
456 | static int | |
6a3124a3 | 457 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, |
2bad8471 EVH |
458 | struct nameidata *nd) |
459 | { | |
6a3124a3 LI |
460 | int err; |
461 | u32 fid, perm, iounit; | |
462 | int flags; | |
463 | struct v9fs_session_info *v9ses; | |
464 | struct v9fs_fid *dfid, *vfid, *ffid; | |
465 | struct inode *inode; | |
466 | struct v9fs_qid qid; | |
467 | struct file *filp; | |
468 | ||
469 | inode = NULL; | |
470 | vfid = NULL; | |
471 | v9ses = v9fs_inode2v9ses(dir); | |
472 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
473 | perm = unixmode2p9mode(v9ses, mode); | |
474 | ||
475 | if (nd && nd->flags & LOOKUP_OPEN) | |
476 | flags = nd->intent.open.flags - 1; | |
477 | else | |
478 | flags = O_RDWR; | |
479 | ||
480 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 481 | perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit); |
6a3124a3 LI |
482 | |
483 | if (err) | |
484 | goto error; | |
485 | ||
486 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
487 | if (IS_ERR(vfid)) { | |
488 | err = PTR_ERR(vfid); | |
489 | vfid = NULL; | |
490 | goto error; | |
491 | } | |
492 | ||
493 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
494 | if (IS_ERR(inode)) { | |
495 | err = PTR_ERR(inode); | |
496 | inode = NULL; | |
497 | goto error; | |
498 | } | |
499 | ||
500 | dentry->d_op = &v9fs_dentry_operations; | |
501 | d_instantiate(dentry, inode); | |
502 | ||
503 | if (nd && nd->flags & LOOKUP_OPEN) { | |
504 | ffid = v9fs_fid_create(v9ses, fid); | |
505 | if (!ffid) | |
506 | return -ENOMEM; | |
507 | ||
508 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); | |
509 | if (IS_ERR(filp)) { | |
510 | v9fs_fid_destroy(ffid); | |
511 | return PTR_ERR(filp); | |
512 | } | |
513 | ||
514 | ffid->rdir_pos = 0; | |
515 | ffid->rdir_fcall = NULL; | |
516 | ffid->fidopen = 1; | |
517 | ffid->iounit = iounit; | |
518 | ffid->filp = filp; | |
519 | filp->private_data = ffid; | |
520 | } | |
521 | ||
522 | return 0; | |
523 | ||
524 | error: | |
525 | if (vfid) | |
526 | v9fs_fid_destroy(vfid); | |
527 | ||
528 | if (inode) | |
529 | iput(inode); | |
530 | ||
531 | return err; | |
2bad8471 EVH |
532 | } |
533 | ||
534 | /** | |
535 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 536 | * @inode: inode that is being unlinked |
2bad8471 EVH |
537 | * @dentry: dentry that is being unlinked |
538 | * @mode: mode for new directory | |
539 | * | |
540 | */ | |
541 | ||
6a3124a3 | 542 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 543 | { |
6a3124a3 LI |
544 | int err; |
545 | u32 fid, perm; | |
546 | struct v9fs_session_info *v9ses; | |
547 | struct v9fs_fid *dfid, *vfid; | |
548 | struct inode *inode; | |
549 | ||
550 | inode = NULL; | |
551 | vfid = NULL; | |
552 | v9ses = v9fs_inode2v9ses(dir); | |
553 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
554 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); | |
555 | ||
556 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 557 | perm, V9FS_OREAD, NULL, &fid, NULL, NULL); |
6a3124a3 LI |
558 | |
559 | if (err) { | |
560 | dprintk(DEBUG_ERROR, "create error %d\n", err); | |
561 | goto error; | |
562 | } | |
563 | ||
564 | err = v9fs_t_clunk(v9ses, fid); | |
565 | if (err) { | |
566 | dprintk(DEBUG_ERROR, "clunk error %d\n", err); | |
567 | goto error; | |
568 | } | |
569 | ||
570 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
571 | if (IS_ERR(vfid)) { | |
572 | err = PTR_ERR(vfid); | |
573 | vfid = NULL; | |
574 | goto error; | |
575 | } | |
576 | ||
577 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
578 | if (IS_ERR(inode)) { | |
579 | err = PTR_ERR(inode); | |
580 | inode = NULL; | |
581 | goto error; | |
582 | } | |
583 | ||
584 | dentry->d_op = &v9fs_dentry_operations; | |
585 | d_instantiate(dentry, inode); | |
586 | return 0; | |
587 | ||
588 | error: | |
589 | if (vfid) | |
590 | v9fs_fid_destroy(vfid); | |
591 | ||
592 | return err; | |
2bad8471 EVH |
593 | } |
594 | ||
595 | /** | |
596 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
597 | * @dir: inode that is being walked from | |
598 | * @dentry: dentry that is being walked to? | |
599 | * @nameidata: path data | |
600 | * | |
601 | */ | |
602 | ||
603 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
604 | struct nameidata *nameidata) | |
605 | { | |
606 | struct super_block *sb; | |
607 | struct v9fs_session_info *v9ses; | |
608 | struct v9fs_fid *dirfid; | |
609 | struct v9fs_fid *fid; | |
610 | struct inode *inode; | |
611 | struct v9fs_fcall *fcall = NULL; | |
2bad8471 EVH |
612 | int dirfidnum = -1; |
613 | int newfid = -1; | |
614 | int result = 0; | |
615 | ||
616 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
731805b4 | 617 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
618 | |
619 | sb = dir->i_sb; | |
620 | v9ses = v9fs_inode2v9ses(dir); | |
5e7a99ac | 621 | dentry->d_op = &v9fs_dentry_operations; |
0b8dd177 | 622 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 EVH |
623 | |
624 | if (!dirfid) { | |
625 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
626 | return ERR_PTR(-EINVAL); | |
627 | } | |
628 | ||
629 | dirfidnum = dirfid->fid; | |
630 | ||
631 | if (dirfidnum < 0) { | |
632 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
633 | dir, dir->i_ino); | |
634 | return ERR_PTR(-EBADF); | |
635 | } | |
636 | ||
637 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
638 | if (newfid < 0) { | |
639 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
640 | return ERR_PTR(-ENOSPC); | |
641 | } | |
642 | ||
6a3124a3 LI |
643 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, |
644 | (char *)dentry->d_name.name, NULL); | |
2bad8471 EVH |
645 | if (result < 0) { |
646 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
647 | if (result == -ENOENT) { | |
648 | d_add(dentry, NULL); | |
0b8dd177 | 649 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
650 | "Return negative dentry %p count %d\n", |
651 | dentry, atomic_read(&dentry->d_count)); | |
652 | return NULL; | |
653 | } | |
654 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
655 | goto FreeFcall; | |
656 | } | |
657 | ||
658 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
659 | if (result < 0) { | |
660 | dprintk(DEBUG_ERROR, "stat error\n"); | |
661 | goto FreeFcall; | |
662 | } | |
663 | ||
531b1094 LI |
664 | inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, |
665 | fcall->params.rstat.stat.mode)); | |
2bad8471 EVH |
666 | |
667 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
668 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
669 | PTR_ERR(inode)); | |
670 | ||
671 | result = -ENOSPC; | |
672 | goto FreeFcall; | |
673 | } | |
674 | ||
531b1094 | 675 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
2bad8471 | 676 | |
6a3124a3 | 677 | fid = v9fs_fid_create(v9ses, newfid); |
2bad8471 EVH |
678 | if (fid == NULL) { |
679 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
680 | result = -ENOMEM; | |
681 | goto FreeFcall; | |
682 | } | |
683 | ||
6a3124a3 LI |
684 | result = v9fs_fid_insert(fid, dentry); |
685 | if (result < 0) | |
686 | goto FreeFcall; | |
687 | ||
531b1094 | 688 | fid->qid = fcall->params.rstat.stat.qid; |
531b1094 | 689 | v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); |
2bad8471 EVH |
690 | |
691 | d_add(dentry, inode); | |
692 | kfree(fcall); | |
693 | ||
694 | return NULL; | |
695 | ||
696 | FreeFcall: | |
697 | kfree(fcall); | |
698 | return ERR_PTR(result); | |
699 | } | |
700 | ||
701 | /** | |
702 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
703 | * @i: inode that is being unlinked | |
73c592b9 | 704 | * @d: dentry that is being unlinked |
2bad8471 EVH |
705 | * |
706 | */ | |
707 | ||
708 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
709 | { | |
710 | return v9fs_remove(i, d, 0); | |
711 | } | |
712 | ||
713 | /** | |
714 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
715 | * @i: inode that is being unlinked | |
73c592b9 | 716 | * @d: dentry that is being unlinked |
2bad8471 EVH |
717 | * |
718 | */ | |
719 | ||
720 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
721 | { | |
722 | return v9fs_remove(i, d, 1); | |
723 | } | |
724 | ||
725 | /** | |
726 | * v9fs_vfs_rename - VFS hook to rename an inode | |
727 | * @old_dir: old dir inode | |
728 | * @old_dentry: old dentry | |
729 | * @new_dir: new dir inode | |
730 | * @new_dentry: new dentry | |
731 | * | |
732 | */ | |
733 | ||
734 | static int | |
735 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
736 | struct inode *new_dir, struct dentry *new_dentry) | |
737 | { | |
738 | struct inode *old_inode = old_dentry->d_inode; | |
739 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 740 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 | 741 | struct v9fs_fid *olddirfid = |
0b8dd177 | 742 | v9fs_fid_lookup(old_dentry->d_parent); |
2bad8471 | 743 | struct v9fs_fid *newdirfid = |
0b8dd177 | 744 | v9fs_fid_lookup(new_dentry->d_parent); |
531b1094 | 745 | struct v9fs_wstat wstat; |
2bad8471 EVH |
746 | struct v9fs_fcall *fcall = NULL; |
747 | int fid = -1; | |
748 | int olddirfidnum = -1; | |
749 | int newdirfidnum = -1; | |
750 | int retval = 0; | |
751 | ||
752 | dprintk(DEBUG_VFS, "\n"); | |
753 | ||
754 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { | |
755 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
756 | return -EBADF; | |
757 | } | |
758 | ||
759 | /* 9P can only handle file rename in the same directory */ | |
760 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
761 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
762 | retval = -EPERM; | |
763 | goto FreeFcallnBail; | |
764 | } | |
765 | ||
766 | fid = oldfid->fid; | |
767 | olddirfidnum = olddirfid->fid; | |
768 | newdirfidnum = newdirfid->fid; | |
769 | ||
770 | if (fid < 0) { | |
771 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
772 | old_inode->i_ino); | |
773 | retval = -EBADF; | |
774 | goto FreeFcallnBail; | |
775 | } | |
776 | ||
531b1094 LI |
777 | v9fs_blank_wstat(&wstat); |
778 | wstat.muid = v9ses->name; | |
779 | wstat.name = (char *) new_dentry->d_name.name; | |
2bad8471 | 780 | |
531b1094 | 781 | retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); |
2bad8471 EVH |
782 | |
783 | FreeFcallnBail: | |
2bad8471 | 784 | if (retval < 0) |
531b1094 | 785 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 EVH |
786 | |
787 | kfree(fcall); | |
788 | return retval; | |
789 | } | |
790 | ||
791 | /** | |
943ffb58 | 792 | * v9fs_vfs_getattr - retrieve file metadata |
2bad8471 EVH |
793 | * @mnt - mount information |
794 | * @dentry - file to get attributes on | |
795 | * @stat - metadata structure to populate | |
796 | * | |
797 | */ | |
798 | ||
799 | static int | |
800 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
801 | struct kstat *stat) | |
802 | { | |
803 | struct v9fs_fcall *fcall = NULL; | |
804 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 805 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
806 | int err = -EPERM; |
807 | ||
808 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
809 | if (!fid) { | |
810 | dprintk(DEBUG_ERROR, | |
811 | "couldn't find fid associated with dentry\n"); | |
812 | return -EBADF; | |
813 | } | |
814 | ||
815 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
816 | ||
817 | if (err < 0) | |
818 | dprintk(DEBUG_ERROR, "stat error\n"); | |
819 | else { | |
531b1094 | 820 | v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, |
2bad8471 EVH |
821 | dentry->d_inode->i_sb); |
822 | generic_fillattr(dentry->d_inode, stat); | |
823 | } | |
824 | ||
825 | kfree(fcall); | |
826 | return err; | |
827 | } | |
828 | ||
829 | /** | |
830 | * v9fs_vfs_setattr - set file metadata | |
831 | * @dentry: file whose metadata to set | |
832 | * @iattr: metadata assignment structure | |
833 | * | |
834 | */ | |
835 | ||
836 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
837 | { | |
838 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 839 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 | 840 | struct v9fs_fcall *fcall = NULL; |
531b1094 | 841 | struct v9fs_wstat wstat; |
2bad8471 EVH |
842 | int res = -EPERM; |
843 | ||
844 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 | 845 | |
2bad8471 EVH |
846 | if (!fid) { |
847 | dprintk(DEBUG_ERROR, | |
848 | "Couldn't find fid associated with dentry\n"); | |
849 | return -EBADF; | |
850 | } | |
851 | ||
531b1094 | 852 | v9fs_blank_wstat(&wstat); |
2bad8471 | 853 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 854 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
855 | |
856 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 857 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
858 | |
859 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 860 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
861 | |
862 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 863 | wstat.length = iattr->ia_size; |
2bad8471 EVH |
864 | |
865 | if (v9ses->extended) { | |
531b1094 LI |
866 | if (iattr->ia_valid & ATTR_UID) |
867 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 868 | |
531b1094 LI |
869 | if (iattr->ia_valid & ATTR_GID) |
870 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
871 | } |
872 | ||
531b1094 | 873 | res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); |
2bad8471 EVH |
874 | |
875 | if (res < 0) | |
531b1094 | 876 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 | 877 | |
2bad8471 | 878 | kfree(fcall); |
2bad8471 EVH |
879 | if (res >= 0) |
880 | res = inode_setattr(dentry->d_inode, iattr); | |
881 | ||
882 | return res; | |
883 | } | |
884 | ||
885 | /** | |
531b1094 LI |
886 | * v9fs_stat2inode - populate an inode structure with mistat info |
887 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
888 | * @inode: inode to populate |
889 | * @sb: superblock of filesystem | |
890 | * | |
891 | */ | |
892 | ||
893 | void | |
531b1094 LI |
894 | v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, |
895 | struct super_block *sb) | |
2bad8471 | 896 | { |
1dac06b2 | 897 | int n; |
531b1094 | 898 | char ext[32]; |
2bad8471 EVH |
899 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
900 | ||
901 | inode->i_nlink = 1; | |
902 | ||
531b1094 LI |
903 | inode->i_atime.tv_sec = stat->atime; |
904 | inode->i_mtime.tv_sec = stat->mtime; | |
905 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 906 | |
531b1094 LI |
907 | inode->i_uid = v9ses->uid; |
908 | inode->i_gid = v9ses->gid; | |
2bad8471 EVH |
909 | |
910 | if (v9ses->extended) { | |
531b1094 LI |
911 | inode->i_uid = stat->n_uid; |
912 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
913 | } |
914 | ||
531b1094 | 915 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
916 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
917 | char type = 0; | |
918 | int major = -1; | |
919 | int minor = -1; | |
531b1094 | 920 | |
1dac06b2 LI |
921 | n = stat->extension.len; |
922 | if (n > sizeof(ext)-1) | |
923 | n = sizeof(ext)-1; | |
924 | memmove(ext, stat->extension.str, n); | |
925 | ext[n] = 0; | |
531b1094 | 926 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
927 | switch (type) { |
928 | case 'c': | |
929 | inode->i_mode &= ~S_IFBLK; | |
930 | inode->i_mode |= S_IFCHR; | |
931 | break; | |
932 | case 'b': | |
933 | break; | |
934 | default: | |
531b1094 LI |
935 | dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", |
936 | type, stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
937 | }; |
938 | inode->i_rdev = MKDEV(major, minor); | |
939 | } else | |
940 | inode->i_rdev = 0; | |
941 | ||
531b1094 | 942 | inode->i_size = stat->length; |
2bad8471 EVH |
943 | |
944 | inode->i_blksize = sb->s_blocksize; | |
945 | inode->i_blocks = | |
946 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
947 | } | |
948 | ||
949 | /** | |
950 | * v9fs_qid2ino - convert qid into inode number | |
951 | * @qid: qid to hash | |
952 | * | |
953 | * BUG: potential for inode number collisions? | |
954 | */ | |
955 | ||
956 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
957 | { | |
958 | u64 path = qid->path + 2; | |
959 | ino_t i = 0; | |
960 | ||
961 | if (sizeof(ino_t) == sizeof(path)) | |
962 | memcpy(&i, &path, sizeof(ino_t)); | |
963 | else | |
964 | i = (ino_t) (path ^ (path >> 32)); | |
965 | ||
966 | return i; | |
967 | } | |
968 | ||
2bad8471 EVH |
969 | /** |
970 | * v9fs_readlink - read a symlink's location (internal version) | |
971 | * @dentry: dentry for symlink | |
73c592b9 | 972 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
973 | * @buflen: length of buffer |
974 | * | |
975 | */ | |
976 | ||
977 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
978 | { | |
979 | int retval = -EPERM; | |
980 | ||
981 | struct v9fs_fcall *fcall = NULL; | |
982 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 983 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
984 | |
985 | if (!fid) { | |
986 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
987 | retval = -EBADF; | |
988 | goto FreeFcall; | |
989 | } | |
990 | ||
991 | if (!v9ses->extended) { | |
992 | retval = -EBADF; | |
993 | dprintk(DEBUG_ERROR, "not extended\n"); | |
994 | goto FreeFcall; | |
995 | } | |
996 | ||
997 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
998 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
999 | ||
1000 | if (retval < 0) { | |
1001 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1002 | goto FreeFcall; | |
1003 | } | |
1004 | ||
1005 | if (!fcall) | |
1006 | return -EIO; | |
1007 | ||
531b1094 | 1008 | if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { |
2bad8471 EVH |
1009 | retval = -EINVAL; |
1010 | goto FreeFcall; | |
1011 | } | |
1012 | ||
1013 | /* copy extension buffer into buffer */ | |
6a3124a3 | 1014 | if (fcall->params.rstat.stat.extension.len < buflen) |
16cce6d2 | 1015 | buflen = fcall->params.rstat.stat.extension.len + 1; |
2bad8471 | 1016 | |
16cce6d2 | 1017 | memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); |
531b1094 | 1018 | buffer[buflen-1] = 0; |
2bad8471 | 1019 | |
16cce6d2 LI |
1020 | dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, |
1021 | fcall->params.rstat.stat.extension.str, buffer); | |
2bad8471 EVH |
1022 | retval = buflen; |
1023 | ||
1024 | FreeFcall: | |
1025 | kfree(fcall); | |
1026 | ||
1027 | return retval; | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * v9fs_vfs_readlink - read a symlink's location | |
1032 | * @dentry: dentry for symlink | |
1033 | * @buf: buffer to load symlink location into | |
1034 | * @buflen: length of buffer | |
1035 | * | |
1036 | */ | |
1037 | ||
1038 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1039 | int buflen) | |
1040 | { | |
1041 | int retval; | |
1042 | int ret; | |
1043 | char *link = __getname(); | |
1044 | ||
a1f9d8d2 LI |
1045 | if (buflen > PATH_MAX) |
1046 | buflen = PATH_MAX; | |
2bad8471 EVH |
1047 | |
1048 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1049 | ||
1050 | retval = v9fs_readlink(dentry, link, buflen); | |
1051 | ||
1052 | if (retval > 0) { | |
1053 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1054 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1055 | ret); | |
1056 | retval = ret; | |
1057 | } | |
1058 | } | |
1059 | ||
ce44eeb6 | 1060 | __putname(link); |
2bad8471 EVH |
1061 | return retval; |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * v9fs_vfs_follow_link - follow a symlink path | |
1066 | * @dentry: dentry for symlink | |
1067 | * @nd: nameidata | |
1068 | * | |
1069 | */ | |
1070 | ||
1071 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1072 | { | |
1073 | int len = 0; | |
1074 | char *link = __getname(); | |
1075 | ||
1076 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1077 | ||
1078 | if (!link) | |
1079 | link = ERR_PTR(-ENOMEM); | |
1080 | else { | |
16cce6d2 | 1081 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1082 | |
1083 | if (len < 0) { | |
ce44eeb6 | 1084 | __putname(link); |
2bad8471 EVH |
1085 | link = ERR_PTR(len); |
1086 | } else | |
1087 | link[len] = 0; | |
1088 | } | |
1089 | nd_set_link(nd, link); | |
1090 | ||
1091 | return NULL; | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * v9fs_vfs_put_link - release a symlink path | |
1096 | * @dentry: dentry for symlink | |
1097 | * @nd: nameidata | |
1098 | * | |
1099 | */ | |
1100 | ||
1101 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1102 | { | |
1103 | char *s = nd_get_link(nd); | |
1104 | ||
1105 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1106 | if (!IS_ERR(s)) | |
ce44eeb6 | 1107 | __putname(s); |
2bad8471 EVH |
1108 | } |
1109 | ||
531b1094 LI |
1110 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1111 | int mode, const char *extension) | |
2bad8471 | 1112 | { |
6a3124a3 LI |
1113 | int err; |
1114 | u32 fid, perm; | |
531b1094 | 1115 | struct v9fs_session_info *v9ses; |
6a3124a3 LI |
1116 | struct v9fs_fid *dfid, *vfid; |
1117 | struct inode *inode; | |
2bad8471 | 1118 | |
6a3124a3 LI |
1119 | inode = NULL; |
1120 | vfid = NULL; | |
1121 | v9ses = v9fs_inode2v9ses(dir); | |
1122 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
1123 | perm = unixmode2p9mode(v9ses, mode); | |
2bad8471 EVH |
1124 | |
1125 | if (!v9ses->extended) { | |
1126 | dprintk(DEBUG_ERROR, "not extended\n"); | |
6a3124a3 | 1127 | return -EPERM; |
2bad8471 EVH |
1128 | } |
1129 | ||
6a3124a3 | 1130 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, |
16cce6d2 | 1131 | perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); |
2bad8471 | 1132 | |
6a3124a3 LI |
1133 | if (err) |
1134 | goto error; | |
1135 | ||
1136 | err = v9fs_t_clunk(v9ses, fid); | |
1137 | if (err) | |
1138 | goto error; | |
1139 | ||
1140 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
1141 | if (IS_ERR(vfid)) { | |
1142 | err = PTR_ERR(vfid); | |
1143 | vfid = NULL; | |
1144 | goto error; | |
1145 | } | |
1146 | ||
1147 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
1148 | if (IS_ERR(inode)) { | |
1149 | err = PTR_ERR(inode); | |
1150 | inode = NULL; | |
1151 | goto error; | |
2bad8471 EVH |
1152 | } |
1153 | ||
6a3124a3 LI |
1154 | dentry->d_op = &v9fs_dentry_operations; |
1155 | d_instantiate(dentry, inode); | |
1156 | return 0; | |
2bad8471 | 1157 | |
6a3124a3 | 1158 | error: |
6a3124a3 LI |
1159 | if (vfid) |
1160 | v9fs_fid_destroy(vfid); | |
1161 | ||
1162 | if (inode) | |
1163 | iput(inode); | |
1164 | ||
1165 | return err; | |
1166 | ||
531b1094 LI |
1167 | } |
1168 | ||
1169 | /** | |
1170 | * v9fs_vfs_symlink - helper function to create symlinks | |
1171 | * @dir: directory inode containing symlink | |
1172 | * @dentry: dentry for symlink | |
1173 | * @symname: symlink data | |
1174 | * | |
1175 | * See 9P2000.u RFC for more information | |
1176 | * | |
1177 | */ | |
1178 | ||
1179 | static int | |
1180 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1181 | { | |
1182 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1183 | symname); | |
1184 | ||
1185 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * v9fs_vfs_link - create a hardlink | |
1190 | * @old_dentry: dentry for file to link to | |
1191 | * @dir: inode destination for new link | |
1192 | * @dentry: dentry for link | |
1193 | * | |
1194 | */ | |
1195 | ||
1196 | /* XXX - lots of code dup'd from symlink and creates, | |
1197 | * figure out a better reuse strategy | |
1198 | */ | |
1199 | ||
1200 | static int | |
1201 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1202 | struct dentry *dentry) | |
1203 | { | |
1204 | int retval; | |
1205 | struct v9fs_fid *oldfid; | |
1206 | char *name; | |
1207 | ||
1208 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1209 | old_dentry->d_name.name); | |
1210 | ||
1211 | oldfid = v9fs_fid_lookup(old_dentry); | |
1212 | if (!oldfid) { | |
1213 | dprintk(DEBUG_ERROR, "can't find oldfid\n"); | |
1214 | return -EPERM; | |
1215 | } | |
1216 | ||
1217 | name = __getname(); | |
16cce6d2 | 1218 | sprintf(name, "%d\n", oldfid->fid); |
531b1094 LI |
1219 | retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); |
1220 | __putname(name); | |
2bad8471 | 1221 | |
2bad8471 EVH |
1222 | return retval; |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * v9fs_vfs_mknod - create a special file | |
1227 | * @dir: inode destination for new link | |
1228 | * @dentry: dentry for file | |
1229 | * @mode: mode for creation | |
1230 | * @dev_t: device associated with special file | |
1231 | * | |
1232 | */ | |
1233 | ||
1234 | static int | |
1235 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1236 | { | |
531b1094 LI |
1237 | int retval; |
1238 | char *name; | |
2bad8471 EVH |
1239 | |
1240 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1241 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1242 | ||
531b1094 LI |
1243 | if (!new_valid_dev(rdev)) |
1244 | return -EINVAL; | |
2bad8471 | 1245 | |
531b1094 | 1246 | name = __getname(); |
c0291a05 ET |
1247 | if (!name) |
1248 | return -ENOMEM; | |
2bad8471 EVH |
1249 | /* build extension */ |
1250 | if (S_ISBLK(mode)) | |
531b1094 | 1251 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1252 | else if (S_ISCHR(mode)) |
531b1094 | 1253 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1254 | else if (S_ISFIFO(mode)) |
531b1094 | 1255 | *name = 0; |
2bad8471 | 1256 | else { |
531b1094 LI |
1257 | __putname(name); |
1258 | return -EINVAL; | |
2bad8471 EVH |
1259 | } |
1260 | ||
531b1094 LI |
1261 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1262 | __putname(name); | |
2bad8471 EVH |
1263 | |
1264 | return retval; | |
1265 | } | |
1266 | ||
b501611a | 1267 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1268 | .create = v9fs_vfs_create, |
1269 | .lookup = v9fs_vfs_lookup, | |
1270 | .symlink = v9fs_vfs_symlink, | |
1271 | .link = v9fs_vfs_link, | |
1272 | .unlink = v9fs_vfs_unlink, | |
1273 | .mkdir = v9fs_vfs_mkdir, | |
1274 | .rmdir = v9fs_vfs_rmdir, | |
1275 | .mknod = v9fs_vfs_mknod, | |
1276 | .rename = v9fs_vfs_rename, | |
1277 | .readlink = v9fs_vfs_readlink, | |
1278 | .getattr = v9fs_vfs_getattr, | |
1279 | .setattr = v9fs_vfs_setattr, | |
1280 | }; | |
1281 | ||
b501611a EVH |
1282 | static struct inode_operations v9fs_dir_inode_operations = { |
1283 | .create = v9fs_vfs_create, | |
1284 | .lookup = v9fs_vfs_lookup, | |
1285 | .unlink = v9fs_vfs_unlink, | |
1286 | .mkdir = v9fs_vfs_mkdir, | |
1287 | .rmdir = v9fs_vfs_rmdir, | |
1288 | .mknod = v9fs_vfs_mknod, | |
1289 | .rename = v9fs_vfs_rename, | |
1290 | .getattr = v9fs_vfs_getattr, | |
1291 | .setattr = v9fs_vfs_setattr, | |
1292 | }; | |
1293 | ||
2bad8471 EVH |
1294 | static struct inode_operations v9fs_file_inode_operations = { |
1295 | .getattr = v9fs_vfs_getattr, | |
1296 | .setattr = v9fs_vfs_setattr, | |
1297 | }; | |
1298 | ||
1299 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1300 | .readlink = v9fs_vfs_readlink, | |
1301 | .follow_link = v9fs_vfs_follow_link, | |
1302 | .put_link = v9fs_vfs_put_link, | |
1303 | .getattr = v9fs_vfs_getattr, | |
1304 | .setattr = v9fs_vfs_setattr, | |
1305 | }; |