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Commit | Line | Data |
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2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
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 |
6a3124a3 LI |
258 | v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, |
259 | u32 perm, u8 mode, 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); |
6a3124a3 | 274 | goto error; |
2bad8471 | 275 | } |
2bad8471 EVH |
276 | kfree(fcall); |
277 | ||
6a3124a3 LI |
278 | err = v9fs_t_create(v9ses, fid, name, perm, mode, &fcall); |
279 | if (err < 0) { | |
531b1094 | 280 | PRINT_FCALL_ERROR("create fails", fcall); |
6a3124a3 | 281 | goto error; |
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 | |
6a3124a3 LI |
296 | error: |
297 | if (fid >= 0) | |
298 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
2bad8471 | 299 | |
6a3124a3 LI |
300 | kfree(fcall); |
301 | return err; | |
302 | } | |
0b8dd177 | 303 | |
6a3124a3 LI |
304 | static struct v9fs_fid* |
305 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
306 | { | |
307 | int err; | |
308 | u32 nfid; | |
309 | struct v9fs_fid *ret; | |
310 | struct v9fs_fcall *fcall; | |
311 | ||
312 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
313 | if (nfid < 0) { | |
0b8dd177 | 314 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 315 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
316 | } |
317 | ||
6a3124a3 LI |
318 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
319 | &fcall); | |
320 | ||
321 | if (err < 0) { | |
322 | PRINT_FCALL_ERROR("walk error", fcall); | |
323 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
324 | goto error; | |
0b8dd177 | 325 | } |
6a3124a3 | 326 | |
3cf6429a LI |
327 | kfree(fcall); |
328 | fcall = NULL; | |
6a3124a3 LI |
329 | ret = v9fs_fid_create(v9ses, nfid); |
330 | if (!ret) { | |
331 | err = -ENOMEM; | |
332 | goto clunk_fid; | |
333 | } | |
0b8dd177 | 334 | |
6a3124a3 LI |
335 | err = v9fs_fid_insert(ret, dentry); |
336 | if (err < 0) { | |
337 | v9fs_fid_destroy(ret); | |
338 | goto clunk_fid; | |
0b8dd177 | 339 | } |
2bad8471 | 340 | |
6a3124a3 | 341 | return ret; |
2bad8471 | 342 | |
6a3124a3 LI |
343 | clunk_fid: |
344 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 345 | |
6a3124a3 LI |
346 | error: |
347 | kfree(fcall); | |
348 | return ERR_PTR(err); | |
349 | } | |
2bad8471 | 350 | |
6a3124a3 LI |
351 | struct inode * |
352 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, | |
353 | struct super_block *sb) | |
354 | { | |
355 | int err, umode; | |
356 | struct inode *ret; | |
357 | struct v9fs_fcall *fcall; | |
531b1094 | 358 | |
6a3124a3 LI |
359 | ret = NULL; |
360 | err = v9fs_t_stat(v9ses, fid, &fcall); | |
361 | if (err) { | |
362 | PRINT_FCALL_ERROR("stat error", fcall); | |
363 | goto error; | |
2bad8471 EVH |
364 | } |
365 | ||
6a3124a3 LI |
366 | umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); |
367 | ret = v9fs_get_inode(sb, umode); | |
368 | if (IS_ERR(ret)) { | |
369 | err = PTR_ERR(ret); | |
370 | ret = NULL; | |
371 | goto error; | |
372 | } | |
2bad8471 | 373 | |
6a3124a3 LI |
374 | v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); |
375 | kfree(fcall); | |
376 | return ret; | |
2bad8471 | 377 | |
6a3124a3 | 378 | error: |
2bad8471 | 379 | kfree(fcall); |
6a3124a3 LI |
380 | if (ret) |
381 | iput(ret); | |
2bad8471 | 382 | |
6a3124a3 | 383 | return ERR_PTR(err); |
2bad8471 EVH |
384 | } |
385 | ||
386 | /** | |
387 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
388 | * @dir: directory inode that is being deleted |
389 | * @file: dentry that is being deleted | |
390 | * @rmdir: removing a directory | |
2bad8471 EVH |
391 | * |
392 | */ | |
393 | ||
394 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
395 | { | |
396 | struct v9fs_fcall *fcall = NULL; | |
397 | struct super_block *sb = NULL; | |
398 | struct v9fs_session_info *v9ses = NULL; | |
399 | struct v9fs_fid *v9fid = NULL; | |
400 | struct inode *file_inode = NULL; | |
401 | int fid = -1; | |
402 | int result = 0; | |
403 | ||
404 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
405 | rmdir); | |
406 | ||
407 | file_inode = file->d_inode; | |
408 | sb = file_inode->i_sb; | |
409 | v9ses = v9fs_inode2v9ses(file_inode); | |
0b8dd177 | 410 | v9fid = v9fs_fid_lookup(file); |
2bad8471 EVH |
411 | |
412 | if (!v9fid) { | |
413 | dprintk(DEBUG_ERROR, | |
414 | "no v9fs_fid\n"); | |
415 | return -EBADF; | |
416 | } | |
417 | ||
418 | fid = v9fid->fid; | |
419 | if (fid < 0) { | |
420 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
421 | file_inode->i_ino); | |
422 | return -EBADF; | |
423 | } | |
424 | ||
425 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
531b1094 LI |
426 | if (result < 0) { |
427 | PRINT_FCALL_ERROR("remove fails", fcall); | |
428 | } else { | |
2bad8471 EVH |
429 | v9fs_put_idpool(fid, &v9ses->fidpool); |
430 | v9fs_fid_destroy(v9fid); | |
431 | } | |
432 | ||
433 | kfree(fcall); | |
434 | return result; | |
435 | } | |
436 | ||
6a3124a3 LI |
437 | static int |
438 | v9fs_open_created(struct inode *inode, struct file *file) | |
439 | { | |
440 | return 0; | |
441 | } | |
442 | ||
2bad8471 EVH |
443 | /** |
444 | * v9fs_vfs_create - VFS hook to create files | |
445 | * @inode: directory inode that is being deleted | |
446 | * @dentry: dentry that is being deleted | |
6a3124a3 | 447 | * @mode: create permissions |
2bad8471 EVH |
448 | * @nd: path information |
449 | * | |
450 | */ | |
451 | ||
452 | static int | |
6a3124a3 | 453 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, |
2bad8471 EVH |
454 | struct nameidata *nd) |
455 | { | |
6a3124a3 LI |
456 | int err; |
457 | u32 fid, perm, iounit; | |
458 | int flags; | |
459 | struct v9fs_session_info *v9ses; | |
460 | struct v9fs_fid *dfid, *vfid, *ffid; | |
461 | struct inode *inode; | |
462 | struct v9fs_qid qid; | |
463 | struct file *filp; | |
464 | ||
465 | inode = NULL; | |
466 | vfid = NULL; | |
467 | v9ses = v9fs_inode2v9ses(dir); | |
468 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
469 | perm = unixmode2p9mode(v9ses, mode); | |
470 | ||
471 | if (nd && nd->flags & LOOKUP_OPEN) | |
472 | flags = nd->intent.open.flags - 1; | |
473 | else | |
474 | flags = O_RDWR; | |
475 | ||
476 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
477 | perm, v9fs_uflags2omode(flags), &fid, &qid, &iounit); | |
478 | ||
479 | if (err) | |
480 | goto error; | |
481 | ||
482 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
483 | if (IS_ERR(vfid)) { | |
484 | err = PTR_ERR(vfid); | |
485 | vfid = NULL; | |
486 | goto error; | |
487 | } | |
488 | ||
489 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
490 | if (IS_ERR(inode)) { | |
491 | err = PTR_ERR(inode); | |
492 | inode = NULL; | |
493 | goto error; | |
494 | } | |
495 | ||
496 | dentry->d_op = &v9fs_dentry_operations; | |
497 | d_instantiate(dentry, inode); | |
498 | ||
499 | if (nd && nd->flags & LOOKUP_OPEN) { | |
500 | ffid = v9fs_fid_create(v9ses, fid); | |
501 | if (!ffid) | |
502 | return -ENOMEM; | |
503 | ||
504 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); | |
505 | if (IS_ERR(filp)) { | |
506 | v9fs_fid_destroy(ffid); | |
507 | return PTR_ERR(filp); | |
508 | } | |
509 | ||
510 | ffid->rdir_pos = 0; | |
511 | ffid->rdir_fcall = NULL; | |
512 | ffid->fidopen = 1; | |
513 | ffid->iounit = iounit; | |
514 | ffid->filp = filp; | |
515 | filp->private_data = ffid; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | ||
520 | error: | |
521 | if (vfid) | |
522 | v9fs_fid_destroy(vfid); | |
523 | ||
524 | if (inode) | |
525 | iput(inode); | |
526 | ||
527 | return err; | |
2bad8471 EVH |
528 | } |
529 | ||
530 | /** | |
531 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 532 | * @inode: inode that is being unlinked |
2bad8471 EVH |
533 | * @dentry: dentry that is being unlinked |
534 | * @mode: mode for new directory | |
535 | * | |
536 | */ | |
537 | ||
6a3124a3 | 538 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 539 | { |
6a3124a3 LI |
540 | int err; |
541 | u32 fid, perm; | |
542 | struct v9fs_session_info *v9ses; | |
543 | struct v9fs_fid *dfid, *vfid; | |
544 | struct inode *inode; | |
545 | ||
546 | inode = NULL; | |
547 | vfid = NULL; | |
548 | v9ses = v9fs_inode2v9ses(dir); | |
549 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
550 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); | |
551 | ||
552 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
553 | perm, V9FS_OREAD, &fid, NULL, NULL); | |
554 | ||
555 | if (err) { | |
556 | dprintk(DEBUG_ERROR, "create error %d\n", err); | |
557 | goto error; | |
558 | } | |
559 | ||
560 | err = v9fs_t_clunk(v9ses, fid); | |
561 | if (err) { | |
562 | dprintk(DEBUG_ERROR, "clunk error %d\n", err); | |
563 | goto error; | |
564 | } | |
565 | ||
566 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
567 | if (IS_ERR(vfid)) { | |
568 | err = PTR_ERR(vfid); | |
569 | vfid = NULL; | |
570 | goto error; | |
571 | } | |
572 | ||
573 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
574 | if (IS_ERR(inode)) { | |
575 | err = PTR_ERR(inode); | |
576 | inode = NULL; | |
577 | goto error; | |
578 | } | |
579 | ||
580 | dentry->d_op = &v9fs_dentry_operations; | |
581 | d_instantiate(dentry, inode); | |
582 | return 0; | |
583 | ||
584 | error: | |
585 | if (vfid) | |
586 | v9fs_fid_destroy(vfid); | |
587 | ||
588 | return err; | |
2bad8471 EVH |
589 | } |
590 | ||
591 | /** | |
592 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
593 | * @dir: inode that is being walked from | |
594 | * @dentry: dentry that is being walked to? | |
595 | * @nameidata: path data | |
596 | * | |
597 | */ | |
598 | ||
599 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
600 | struct nameidata *nameidata) | |
601 | { | |
602 | struct super_block *sb; | |
603 | struct v9fs_session_info *v9ses; | |
604 | struct v9fs_fid *dirfid; | |
605 | struct v9fs_fid *fid; | |
606 | struct inode *inode; | |
607 | struct v9fs_fcall *fcall = NULL; | |
2bad8471 EVH |
608 | int dirfidnum = -1; |
609 | int newfid = -1; | |
610 | int result = 0; | |
611 | ||
612 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
731805b4 | 613 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
614 | |
615 | sb = dir->i_sb; | |
616 | v9ses = v9fs_inode2v9ses(dir); | |
5e7a99ac | 617 | dentry->d_op = &v9fs_dentry_operations; |
0b8dd177 | 618 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 EVH |
619 | |
620 | if (!dirfid) { | |
621 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
622 | return ERR_PTR(-EINVAL); | |
623 | } | |
624 | ||
625 | dirfidnum = dirfid->fid; | |
626 | ||
627 | if (dirfidnum < 0) { | |
628 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
629 | dir, dir->i_ino); | |
630 | return ERR_PTR(-EBADF); | |
631 | } | |
632 | ||
633 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
634 | if (newfid < 0) { | |
635 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
636 | return ERR_PTR(-ENOSPC); | |
637 | } | |
638 | ||
6a3124a3 LI |
639 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, |
640 | (char *)dentry->d_name.name, NULL); | |
2bad8471 EVH |
641 | if (result < 0) { |
642 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
643 | if (result == -ENOENT) { | |
644 | d_add(dentry, NULL); | |
0b8dd177 | 645 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
646 | "Return negative dentry %p count %d\n", |
647 | dentry, atomic_read(&dentry->d_count)); | |
648 | return NULL; | |
649 | } | |
650 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
651 | goto FreeFcall; | |
652 | } | |
653 | ||
654 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
655 | if (result < 0) { | |
656 | dprintk(DEBUG_ERROR, "stat error\n"); | |
657 | goto FreeFcall; | |
658 | } | |
659 | ||
531b1094 LI |
660 | inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, |
661 | fcall->params.rstat.stat.mode)); | |
2bad8471 EVH |
662 | |
663 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
664 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
665 | PTR_ERR(inode)); | |
666 | ||
667 | result = -ENOSPC; | |
668 | goto FreeFcall; | |
669 | } | |
670 | ||
531b1094 | 671 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
2bad8471 | 672 | |
6a3124a3 | 673 | fid = v9fs_fid_create(v9ses, newfid); |
2bad8471 EVH |
674 | if (fid == NULL) { |
675 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
676 | result = -ENOMEM; | |
677 | goto FreeFcall; | |
678 | } | |
679 | ||
6a3124a3 LI |
680 | result = v9fs_fid_insert(fid, dentry); |
681 | if (result < 0) | |
682 | goto FreeFcall; | |
683 | ||
531b1094 | 684 | fid->qid = fcall->params.rstat.stat.qid; |
531b1094 | 685 | v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); |
2bad8471 EVH |
686 | |
687 | d_add(dentry, inode); | |
688 | kfree(fcall); | |
689 | ||
690 | return NULL; | |
691 | ||
692 | FreeFcall: | |
693 | kfree(fcall); | |
694 | return ERR_PTR(result); | |
695 | } | |
696 | ||
697 | /** | |
698 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
699 | * @i: inode that is being unlinked | |
73c592b9 | 700 | * @d: dentry that is being unlinked |
2bad8471 EVH |
701 | * |
702 | */ | |
703 | ||
704 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
705 | { | |
706 | return v9fs_remove(i, d, 0); | |
707 | } | |
708 | ||
709 | /** | |
710 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
711 | * @i: inode that is being unlinked | |
73c592b9 | 712 | * @d: dentry that is being unlinked |
2bad8471 EVH |
713 | * |
714 | */ | |
715 | ||
716 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
717 | { | |
718 | return v9fs_remove(i, d, 1); | |
719 | } | |
720 | ||
721 | /** | |
722 | * v9fs_vfs_rename - VFS hook to rename an inode | |
723 | * @old_dir: old dir inode | |
724 | * @old_dentry: old dentry | |
725 | * @new_dir: new dir inode | |
726 | * @new_dentry: new dentry | |
727 | * | |
728 | */ | |
729 | ||
730 | static int | |
731 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
732 | struct inode *new_dir, struct dentry *new_dentry) | |
733 | { | |
734 | struct inode *old_inode = old_dentry->d_inode; | |
735 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 736 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 | 737 | struct v9fs_fid *olddirfid = |
0b8dd177 | 738 | v9fs_fid_lookup(old_dentry->d_parent); |
2bad8471 | 739 | struct v9fs_fid *newdirfid = |
0b8dd177 | 740 | v9fs_fid_lookup(new_dentry->d_parent); |
531b1094 | 741 | struct v9fs_wstat wstat; |
2bad8471 EVH |
742 | struct v9fs_fcall *fcall = NULL; |
743 | int fid = -1; | |
744 | int olddirfidnum = -1; | |
745 | int newdirfidnum = -1; | |
746 | int retval = 0; | |
747 | ||
748 | dprintk(DEBUG_VFS, "\n"); | |
749 | ||
750 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { | |
751 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
752 | return -EBADF; | |
753 | } | |
754 | ||
755 | /* 9P can only handle file rename in the same directory */ | |
756 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
757 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
758 | retval = -EPERM; | |
759 | goto FreeFcallnBail; | |
760 | } | |
761 | ||
762 | fid = oldfid->fid; | |
763 | olddirfidnum = olddirfid->fid; | |
764 | newdirfidnum = newdirfid->fid; | |
765 | ||
766 | if (fid < 0) { | |
767 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
768 | old_inode->i_ino); | |
769 | retval = -EBADF; | |
770 | goto FreeFcallnBail; | |
771 | } | |
772 | ||
531b1094 LI |
773 | v9fs_blank_wstat(&wstat); |
774 | wstat.muid = v9ses->name; | |
775 | wstat.name = (char *) new_dentry->d_name.name; | |
2bad8471 | 776 | |
531b1094 | 777 | retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); |
2bad8471 EVH |
778 | |
779 | FreeFcallnBail: | |
2bad8471 | 780 | if (retval < 0) |
531b1094 | 781 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 EVH |
782 | |
783 | kfree(fcall); | |
784 | return retval; | |
785 | } | |
786 | ||
787 | /** | |
943ffb58 | 788 | * v9fs_vfs_getattr - retrieve file metadata |
2bad8471 EVH |
789 | * @mnt - mount information |
790 | * @dentry - file to get attributes on | |
791 | * @stat - metadata structure to populate | |
792 | * | |
793 | */ | |
794 | ||
795 | static int | |
796 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
797 | struct kstat *stat) | |
798 | { | |
799 | struct v9fs_fcall *fcall = NULL; | |
800 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 801 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
802 | int err = -EPERM; |
803 | ||
804 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
805 | if (!fid) { | |
806 | dprintk(DEBUG_ERROR, | |
807 | "couldn't find fid associated with dentry\n"); | |
808 | return -EBADF; | |
809 | } | |
810 | ||
811 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
812 | ||
813 | if (err < 0) | |
814 | dprintk(DEBUG_ERROR, "stat error\n"); | |
815 | else { | |
531b1094 | 816 | v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, |
2bad8471 EVH |
817 | dentry->d_inode->i_sb); |
818 | generic_fillattr(dentry->d_inode, stat); | |
819 | } | |
820 | ||
821 | kfree(fcall); | |
822 | return err; | |
823 | } | |
824 | ||
825 | /** | |
826 | * v9fs_vfs_setattr - set file metadata | |
827 | * @dentry: file whose metadata to set | |
828 | * @iattr: metadata assignment structure | |
829 | * | |
830 | */ | |
831 | ||
832 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
833 | { | |
834 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 835 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 | 836 | struct v9fs_fcall *fcall = NULL; |
531b1094 | 837 | struct v9fs_wstat wstat; |
2bad8471 EVH |
838 | int res = -EPERM; |
839 | ||
840 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 | 841 | |
2bad8471 EVH |
842 | if (!fid) { |
843 | dprintk(DEBUG_ERROR, | |
844 | "Couldn't find fid associated with dentry\n"); | |
845 | return -EBADF; | |
846 | } | |
847 | ||
531b1094 | 848 | v9fs_blank_wstat(&wstat); |
2bad8471 | 849 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 850 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
851 | |
852 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 853 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
854 | |
855 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 856 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
857 | |
858 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 859 | wstat.length = iattr->ia_size; |
2bad8471 EVH |
860 | |
861 | if (v9ses->extended) { | |
531b1094 LI |
862 | if (iattr->ia_valid & ATTR_UID) |
863 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 864 | |
531b1094 LI |
865 | if (iattr->ia_valid & ATTR_GID) |
866 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
867 | } |
868 | ||
531b1094 | 869 | res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); |
2bad8471 EVH |
870 | |
871 | if (res < 0) | |
531b1094 | 872 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 | 873 | |
2bad8471 | 874 | kfree(fcall); |
2bad8471 EVH |
875 | if (res >= 0) |
876 | res = inode_setattr(dentry->d_inode, iattr); | |
877 | ||
878 | return res; | |
879 | } | |
880 | ||
881 | /** | |
531b1094 LI |
882 | * v9fs_stat2inode - populate an inode structure with mistat info |
883 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
884 | * @inode: inode to populate |
885 | * @sb: superblock of filesystem | |
886 | * | |
887 | */ | |
888 | ||
889 | void | |
531b1094 LI |
890 | v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, |
891 | struct super_block *sb) | |
2bad8471 | 892 | { |
1dac06b2 | 893 | int n; |
531b1094 | 894 | char ext[32]; |
2bad8471 EVH |
895 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
896 | ||
897 | inode->i_nlink = 1; | |
898 | ||
531b1094 LI |
899 | inode->i_atime.tv_sec = stat->atime; |
900 | inode->i_mtime.tv_sec = stat->mtime; | |
901 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 902 | |
531b1094 LI |
903 | inode->i_uid = v9ses->uid; |
904 | inode->i_gid = v9ses->gid; | |
2bad8471 EVH |
905 | |
906 | if (v9ses->extended) { | |
531b1094 LI |
907 | inode->i_uid = stat->n_uid; |
908 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
909 | } |
910 | ||
531b1094 | 911 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
912 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
913 | char type = 0; | |
914 | int major = -1; | |
915 | int minor = -1; | |
531b1094 | 916 | |
1dac06b2 LI |
917 | n = stat->extension.len; |
918 | if (n > sizeof(ext)-1) | |
919 | n = sizeof(ext)-1; | |
920 | memmove(ext, stat->extension.str, n); | |
921 | ext[n] = 0; | |
531b1094 | 922 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
923 | switch (type) { |
924 | case 'c': | |
925 | inode->i_mode &= ~S_IFBLK; | |
926 | inode->i_mode |= S_IFCHR; | |
927 | break; | |
928 | case 'b': | |
929 | break; | |
930 | default: | |
531b1094 LI |
931 | dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", |
932 | type, stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
933 | }; |
934 | inode->i_rdev = MKDEV(major, minor); | |
935 | } else | |
936 | inode->i_rdev = 0; | |
937 | ||
531b1094 | 938 | inode->i_size = stat->length; |
2bad8471 EVH |
939 | |
940 | inode->i_blksize = sb->s_blocksize; | |
941 | inode->i_blocks = | |
942 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
943 | } | |
944 | ||
945 | /** | |
946 | * v9fs_qid2ino - convert qid into inode number | |
947 | * @qid: qid to hash | |
948 | * | |
949 | * BUG: potential for inode number collisions? | |
950 | */ | |
951 | ||
952 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
953 | { | |
954 | u64 path = qid->path + 2; | |
955 | ino_t i = 0; | |
956 | ||
957 | if (sizeof(ino_t) == sizeof(path)) | |
958 | memcpy(&i, &path, sizeof(ino_t)); | |
959 | else | |
960 | i = (ino_t) (path ^ (path >> 32)); | |
961 | ||
962 | return i; | |
963 | } | |
964 | ||
2bad8471 EVH |
965 | /** |
966 | * v9fs_readlink - read a symlink's location (internal version) | |
967 | * @dentry: dentry for symlink | |
73c592b9 | 968 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
969 | * @buflen: length of buffer |
970 | * | |
971 | */ | |
972 | ||
973 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
974 | { | |
975 | int retval = -EPERM; | |
976 | ||
977 | struct v9fs_fcall *fcall = NULL; | |
978 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 979 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
980 | |
981 | if (!fid) { | |
982 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
983 | retval = -EBADF; | |
984 | goto FreeFcall; | |
985 | } | |
986 | ||
987 | if (!v9ses->extended) { | |
988 | retval = -EBADF; | |
989 | dprintk(DEBUG_ERROR, "not extended\n"); | |
990 | goto FreeFcall; | |
991 | } | |
992 | ||
993 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
994 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
995 | ||
996 | if (retval < 0) { | |
997 | dprintk(DEBUG_ERROR, "stat error\n"); | |
998 | goto FreeFcall; | |
999 | } | |
1000 | ||
1001 | if (!fcall) | |
1002 | return -EIO; | |
1003 | ||
531b1094 | 1004 | if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { |
2bad8471 EVH |
1005 | retval = -EINVAL; |
1006 | goto FreeFcall; | |
1007 | } | |
1008 | ||
1009 | /* copy extension buffer into buffer */ | |
6a3124a3 LI |
1010 | if (fcall->params.rstat.stat.extension.len < buflen) |
1011 | buflen = fcall->params.rstat.stat.extension.len; | |
2bad8471 | 1012 | |
531b1094 LI |
1013 | memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); |
1014 | buffer[buflen-1] = 0; | |
2bad8471 EVH |
1015 | |
1016 | retval = buflen; | |
1017 | ||
1018 | FreeFcall: | |
1019 | kfree(fcall); | |
1020 | ||
1021 | return retval; | |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * v9fs_vfs_readlink - read a symlink's location | |
1026 | * @dentry: dentry for symlink | |
1027 | * @buf: buffer to load symlink location into | |
1028 | * @buflen: length of buffer | |
1029 | * | |
1030 | */ | |
1031 | ||
1032 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1033 | int buflen) | |
1034 | { | |
1035 | int retval; | |
1036 | int ret; | |
1037 | char *link = __getname(); | |
1038 | ||
a1f9d8d2 LI |
1039 | if (buflen > PATH_MAX) |
1040 | buflen = PATH_MAX; | |
2bad8471 EVH |
1041 | |
1042 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1043 | ||
1044 | retval = v9fs_readlink(dentry, link, buflen); | |
1045 | ||
1046 | if (retval > 0) { | |
1047 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1048 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1049 | ret); | |
1050 | retval = ret; | |
1051 | } | |
1052 | } | |
1053 | ||
ce44eeb6 | 1054 | __putname(link); |
2bad8471 EVH |
1055 | return retval; |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * v9fs_vfs_follow_link - follow a symlink path | |
1060 | * @dentry: dentry for symlink | |
1061 | * @nd: nameidata | |
1062 | * | |
1063 | */ | |
1064 | ||
1065 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1066 | { | |
1067 | int len = 0; | |
1068 | char *link = __getname(); | |
1069 | ||
1070 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1071 | ||
1072 | if (!link) | |
1073 | link = ERR_PTR(-ENOMEM); | |
1074 | else { | |
6a3124a3 | 1075 | len = v9fs_readlink(dentry, link, strlen(link)); |
2bad8471 EVH |
1076 | |
1077 | if (len < 0) { | |
ce44eeb6 | 1078 | __putname(link); |
2bad8471 EVH |
1079 | link = ERR_PTR(len); |
1080 | } else | |
1081 | link[len] = 0; | |
1082 | } | |
1083 | nd_set_link(nd, link); | |
1084 | ||
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * v9fs_vfs_put_link - release a symlink path | |
1090 | * @dentry: dentry for symlink | |
1091 | * @nd: nameidata | |
1092 | * | |
1093 | */ | |
1094 | ||
1095 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1096 | { | |
1097 | char *s = nd_get_link(nd); | |
1098 | ||
1099 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1100 | if (!IS_ERR(s)) | |
ce44eeb6 | 1101 | __putname(s); |
2bad8471 EVH |
1102 | } |
1103 | ||
531b1094 LI |
1104 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1105 | int mode, const char *extension) | |
2bad8471 | 1106 | { |
6a3124a3 LI |
1107 | int err; |
1108 | u32 fid, perm; | |
531b1094 | 1109 | struct v9fs_session_info *v9ses; |
6a3124a3 LI |
1110 | struct v9fs_fid *dfid, *vfid; |
1111 | struct inode *inode; | |
531b1094 | 1112 | struct v9fs_fcall *fcall; |
531b1094 | 1113 | struct v9fs_wstat wstat; |
2bad8471 | 1114 | |
531b1094 | 1115 | fcall = NULL; |
6a3124a3 LI |
1116 | inode = NULL; |
1117 | vfid = NULL; | |
1118 | v9ses = v9fs_inode2v9ses(dir); | |
1119 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
1120 | perm = unixmode2p9mode(v9ses, mode); | |
2bad8471 EVH |
1121 | |
1122 | if (!v9ses->extended) { | |
1123 | dprintk(DEBUG_ERROR, "not extended\n"); | |
6a3124a3 | 1124 | return -EPERM; |
2bad8471 EVH |
1125 | } |
1126 | ||
6a3124a3 LI |
1127 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, |
1128 | perm, V9FS_OREAD, &fid, NULL, NULL); | |
2bad8471 | 1129 | |
6a3124a3 LI |
1130 | if (err) |
1131 | goto error; | |
1132 | ||
1133 | err = v9fs_t_clunk(v9ses, fid); | |
1134 | if (err) | |
1135 | goto error; | |
1136 | ||
1137 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
1138 | if (IS_ERR(vfid)) { | |
1139 | err = PTR_ERR(vfid); | |
1140 | vfid = NULL; | |
1141 | goto error; | |
1142 | } | |
1143 | ||
1144 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
1145 | if (IS_ERR(inode)) { | |
1146 | err = PTR_ERR(inode); | |
1147 | inode = NULL; | |
1148 | goto error; | |
2bad8471 EVH |
1149 | } |
1150 | ||
531b1094 LI |
1151 | /* issue a Twstat */ |
1152 | v9fs_blank_wstat(&wstat); | |
1153 | wstat.muid = v9ses->name; | |
1154 | wstat.extension = (char *) extension; | |
6a3124a3 | 1155 | err = v9fs_t_wstat(v9ses, vfid->fid, &wstat, &fcall); |
3cf6429a | 1156 | if (err < 0) { |
6a3124a3 LI |
1157 | PRINT_FCALL_ERROR("wstat error", fcall); |
1158 | goto error; | |
2bad8471 EVH |
1159 | } |
1160 | ||
6a3124a3 LI |
1161 | kfree(fcall); |
1162 | dentry->d_op = &v9fs_dentry_operations; | |
1163 | d_instantiate(dentry, inode); | |
1164 | return 0; | |
2bad8471 | 1165 | |
6a3124a3 | 1166 | error: |
2bad8471 | 1167 | kfree(fcall); |
6a3124a3 LI |
1168 | if (vfid) |
1169 | v9fs_fid_destroy(vfid); | |
1170 | ||
1171 | if (inode) | |
1172 | iput(inode); | |
1173 | ||
1174 | return err; | |
1175 | ||
531b1094 LI |
1176 | } |
1177 | ||
1178 | /** | |
1179 | * v9fs_vfs_symlink - helper function to create symlinks | |
1180 | * @dir: directory inode containing symlink | |
1181 | * @dentry: dentry for symlink | |
1182 | * @symname: symlink data | |
1183 | * | |
1184 | * See 9P2000.u RFC for more information | |
1185 | * | |
1186 | */ | |
1187 | ||
1188 | static int | |
1189 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1190 | { | |
1191 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1192 | symname); | |
1193 | ||
1194 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * v9fs_vfs_link - create a hardlink | |
1199 | * @old_dentry: dentry for file to link to | |
1200 | * @dir: inode destination for new link | |
1201 | * @dentry: dentry for link | |
1202 | * | |
1203 | */ | |
1204 | ||
1205 | /* XXX - lots of code dup'd from symlink and creates, | |
1206 | * figure out a better reuse strategy | |
1207 | */ | |
1208 | ||
1209 | static int | |
1210 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1211 | struct dentry *dentry) | |
1212 | { | |
1213 | int retval; | |
1214 | struct v9fs_fid *oldfid; | |
1215 | char *name; | |
1216 | ||
1217 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1218 | old_dentry->d_name.name); | |
1219 | ||
1220 | oldfid = v9fs_fid_lookup(old_dentry); | |
1221 | if (!oldfid) { | |
1222 | dprintk(DEBUG_ERROR, "can't find oldfid\n"); | |
1223 | return -EPERM; | |
1224 | } | |
1225 | ||
1226 | name = __getname(); | |
1227 | sprintf(name, "hardlink(%d)\n", oldfid->fid); | |
1228 | retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); | |
1229 | __putname(name); | |
2bad8471 | 1230 | |
2bad8471 EVH |
1231 | return retval; |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * v9fs_vfs_mknod - create a special file | |
1236 | * @dir: inode destination for new link | |
1237 | * @dentry: dentry for file | |
1238 | * @mode: mode for creation | |
1239 | * @dev_t: device associated with special file | |
1240 | * | |
1241 | */ | |
1242 | ||
1243 | static int | |
1244 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1245 | { | |
531b1094 LI |
1246 | int retval; |
1247 | char *name; | |
2bad8471 EVH |
1248 | |
1249 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1250 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1251 | ||
531b1094 LI |
1252 | if (!new_valid_dev(rdev)) |
1253 | return -EINVAL; | |
2bad8471 | 1254 | |
531b1094 | 1255 | name = __getname(); |
2bad8471 EVH |
1256 | /* build extension */ |
1257 | if (S_ISBLK(mode)) | |
531b1094 | 1258 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1259 | else if (S_ISCHR(mode)) |
531b1094 | 1260 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1261 | else if (S_ISFIFO(mode)) |
531b1094 | 1262 | *name = 0; |
2bad8471 | 1263 | else { |
531b1094 LI |
1264 | __putname(name); |
1265 | return -EINVAL; | |
2bad8471 EVH |
1266 | } |
1267 | ||
531b1094 LI |
1268 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1269 | __putname(name); | |
2bad8471 EVH |
1270 | |
1271 | return retval; | |
1272 | } | |
1273 | ||
b501611a | 1274 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1275 | .create = v9fs_vfs_create, |
1276 | .lookup = v9fs_vfs_lookup, | |
1277 | .symlink = v9fs_vfs_symlink, | |
1278 | .link = v9fs_vfs_link, | |
1279 | .unlink = v9fs_vfs_unlink, | |
1280 | .mkdir = v9fs_vfs_mkdir, | |
1281 | .rmdir = v9fs_vfs_rmdir, | |
1282 | .mknod = v9fs_vfs_mknod, | |
1283 | .rename = v9fs_vfs_rename, | |
1284 | .readlink = v9fs_vfs_readlink, | |
1285 | .getattr = v9fs_vfs_getattr, | |
1286 | .setattr = v9fs_vfs_setattr, | |
1287 | }; | |
1288 | ||
b501611a EVH |
1289 | static struct inode_operations v9fs_dir_inode_operations = { |
1290 | .create = v9fs_vfs_create, | |
1291 | .lookup = v9fs_vfs_lookup, | |
1292 | .unlink = v9fs_vfs_unlink, | |
1293 | .mkdir = v9fs_vfs_mkdir, | |
1294 | .rmdir = v9fs_vfs_rmdir, | |
1295 | .mknod = v9fs_vfs_mknod, | |
1296 | .rename = v9fs_vfs_rename, | |
1297 | .getattr = v9fs_vfs_getattr, | |
1298 | .setattr = v9fs_vfs_setattr, | |
1299 | }; | |
1300 | ||
2bad8471 EVH |
1301 | static struct inode_operations v9fs_file_inode_operations = { |
1302 | .getattr = v9fs_vfs_getattr, | |
1303 | .setattr = v9fs_vfs_setattr, | |
1304 | }; | |
1305 | ||
1306 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1307 | .readlink = v9fs_vfs_readlink, | |
1308 | .follow_link = v9fs_vfs_follow_link, | |
1309 | .put_link = v9fs_vfs_put_link, | |
1310 | .getattr = v9fs_vfs_getattr, | |
1311 | .setattr = v9fs_vfs_setattr, | |
1312 | }; |