Commit | Line | Data |
---|---|---|
2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
2bad8471 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/smp_lock.h> | |
34 | #include <linux/inet.h> | |
35 | #include <linux/namei.h> | |
36 | #include <linux/idr.h> | |
37 | ||
38 | #include "debug.h" | |
39 | #include "v9fs.h" | |
40 | #include "9p.h" | |
41 | #include "v9fs_vfs.h" | |
2bad8471 EVH |
42 | #include "fid.h" |
43 | ||
44 | static struct inode_operations v9fs_dir_inode_operations; | |
b501611a | 45 | static struct inode_operations v9fs_dir_inode_operations_ext; |
2bad8471 EVH |
46 | static struct inode_operations v9fs_file_inode_operations; |
47 | static struct inode_operations v9fs_symlink_inode_operations; | |
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)) | |
61 | res |= V9FS_DMDIR; | |
62 | if (v9ses->extended) { | |
63 | if (S_ISLNK(mode)) | |
64 | res |= V9FS_DMSYMLINK; | |
65 | if (v9ses->nodev == 0) { | |
66 | if (S_ISSOCK(mode)) | |
67 | res |= V9FS_DMSOCKET; | |
68 | if (S_ISFIFO(mode)) | |
69 | res |= V9FS_DMNAMEDPIPE; | |
70 | if (S_ISBLK(mode)) | |
71 | res |= V9FS_DMDEVICE; | |
72 | if (S_ISCHR(mode)) | |
73 | res |= V9FS_DMDEVICE; | |
74 | } | |
75 | ||
76 | if ((mode & S_ISUID) == S_ISUID) | |
77 | res |= V9FS_DMSETUID; | |
78 | if ((mode & S_ISGID) == S_ISGID) | |
79 | res |= V9FS_DMSETGID; | |
80 | if ((mode & V9FS_DMLINK)) | |
81 | res |= V9FS_DMLINK; | |
82 | } | |
83 | ||
84 | return res; | |
85 | } | |
86 | ||
87 | /** | |
88 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
89 | * @v9ses: v9fs session information | |
90 | * @mode: mode to convert | |
91 | * | |
92 | */ | |
93 | ||
73c592b9 | 94 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
95 | { |
96 | int res; | |
97 | ||
98 | res = mode & 0777; | |
99 | ||
100 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) | |
101 | res |= S_IFDIR; | |
102 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) | |
103 | res |= S_IFLNK; | |
104 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) | |
105 | && (v9ses->nodev == 0)) | |
106 | res |= S_IFSOCK; | |
107 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) | |
108 | && (v9ses->nodev == 0)) | |
109 | res |= S_IFIFO; | |
110 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) | |
111 | && (v9ses->nodev == 0)) | |
112 | res |= S_IFBLK; | |
113 | else | |
114 | res |= S_IFREG; | |
115 | ||
116 | if (v9ses->extended) { | |
117 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) | |
118 | res |= S_ISUID; | |
119 | ||
120 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) | |
121 | res |= S_ISGID; | |
122 | } | |
123 | ||
124 | return res; | |
125 | } | |
126 | ||
6a3124a3 LI |
127 | int v9fs_uflags2omode(int uflags) |
128 | { | |
129 | int ret; | |
130 | ||
131 | ret = 0; | |
132 | switch (uflags&3) { | |
133 | default: | |
134 | case O_RDONLY: | |
135 | ret = V9FS_OREAD; | |
136 | break; | |
137 | ||
138 | case O_WRONLY: | |
139 | ret = V9FS_OWRITE; | |
140 | break; | |
141 | ||
142 | case O_RDWR: | |
143 | ret = V9FS_ORDWR; | |
144 | break; | |
145 | } | |
146 | ||
147 | if (uflags & O_EXCL) | |
148 | ret |= V9FS_OEXCL; | |
149 | ||
150 | if (uflags & O_TRUNC) | |
151 | ret |= V9FS_OTRUNC; | |
152 | ||
153 | if (uflags & O_APPEND) | |
154 | ret |= V9FS_OAPPEND; | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
2bad8471 | 159 | /** |
531b1094 | 160 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
2bad8471 | 161 | * @v9ses: 9P session info (for determining extended mode) |
531b1094 | 162 | * @wstat: structure to initialize |
2bad8471 EVH |
163 | * |
164 | */ | |
165 | ||
73c592b9 | 166 | static void |
531b1094 | 167 | v9fs_blank_wstat(struct v9fs_wstat *wstat) |
2bad8471 | 168 | { |
531b1094 LI |
169 | wstat->type = ~0; |
170 | wstat->dev = ~0; | |
171 | wstat->qid.type = ~0; | |
172 | wstat->qid.version = ~0; | |
173 | *((long long *)&wstat->qid.path) = ~0; | |
174 | wstat->mode = ~0; | |
175 | wstat->atime = ~0; | |
176 | wstat->mtime = ~0; | |
177 | wstat->length = ~0; | |
178 | wstat->name = NULL; | |
179 | wstat->uid = NULL; | |
180 | wstat->gid = NULL; | |
181 | wstat->muid = NULL; | |
182 | wstat->n_uid = ~0; | |
183 | wstat->n_gid = ~0; | |
184 | wstat->n_muid = ~0; | |
185 | wstat->extension = NULL; | |
2bad8471 EVH |
186 | } |
187 | ||
188 | /** | |
189 | * v9fs_get_inode - helper function to setup an inode | |
190 | * @sb: superblock | |
191 | * @mode: mode to setup inode with | |
192 | * | |
193 | */ | |
194 | ||
195 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
196 | { | |
6a3124a3 | 197 | struct inode *inode; |
b501611a | 198 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 EVH |
199 | |
200 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
201 | ||
202 | inode = new_inode(sb); | |
203 | if (inode) { | |
204 | inode->i_mode = mode; | |
205 | inode->i_uid = current->fsuid; | |
206 | inode->i_gid = current->fsgid; | |
2bad8471 EVH |
207 | inode->i_blocks = 0; |
208 | inode->i_rdev = 0; | |
209 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
147b31cf | 210 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
2bad8471 EVH |
211 | |
212 | switch (mode & S_IFMT) { | |
213 | case S_IFIFO: | |
214 | case S_IFBLK: | |
215 | case S_IFCHR: | |
216 | case S_IFSOCK: | |
b501611a EVH |
217 | if(!v9ses->extended) { |
218 | dprintk(DEBUG_ERROR, "special files without extended mode\n"); | |
219 | return ERR_PTR(-EINVAL); | |
220 | } | |
5d58bec5 EVH |
221 | init_special_inode(inode, inode->i_mode, |
222 | inode->i_rdev); | |
223 | break; | |
2bad8471 EVH |
224 | case S_IFREG: |
225 | inode->i_op = &v9fs_file_inode_operations; | |
226 | inode->i_fop = &v9fs_file_operations; | |
227 | break; | |
b501611a EVH |
228 | case S_IFLNK: |
229 | if(!v9ses->extended) { | |
230 | dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); | |
231 | return ERR_PTR(-EINVAL); | |
232 | } | |
233 | inode->i_op = &v9fs_symlink_inode_operations; | |
234 | break; | |
2bad8471 | 235 | case S_IFDIR: |
d8c76e6f | 236 | inc_nlink(inode); |
b501611a EVH |
237 | if(v9ses->extended) |
238 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
239 | else | |
240 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
241 | inode->i_fop = &v9fs_dir_operations; |
242 | break; | |
2bad8471 EVH |
243 | default: |
244 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
245 | mode, mode & S_IFMT); | |
246 | return ERR_PTR(-EINVAL); | |
247 | } | |
248 | } else { | |
249 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
250 | return ERR_PTR(-ENOMEM); | |
251 | } | |
252 | return inode; | |
253 | } | |
254 | ||
2bad8471 | 255 | static int |
16cce6d2 LI |
256 | v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, |
257 | u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) | |
2bad8471 | 258 | { |
736c4b85 | 259 | int fid; |
3cf6429a | 260 | int err; |
6a3124a3 | 261 | struct v9fs_fcall *fcall; |
2bad8471 | 262 | |
6a3124a3 LI |
263 | fid = v9fs_get_idpool(&v9ses->fidpool); |
264 | if (fid < 0) { | |
2bad8471 | 265 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 266 | return -ENOSPC; |
2bad8471 EVH |
267 | } |
268 | ||
6a3124a3 LI |
269 | err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); |
270 | if (err < 0) { | |
531b1094 | 271 | PRINT_FCALL_ERROR("clone error", fcall); |
41e5a6ac LI |
272 | if (fcall && fcall->id == RWALK) |
273 | goto clunk_fid; | |
274 | else | |
275 | goto put_fid; | |
2bad8471 | 276 | } |
2bad8471 EVH |
277 | kfree(fcall); |
278 | ||
16cce6d2 | 279 | err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall); |
6a3124a3 | 280 | if (err < 0) { |
531b1094 | 281 | PRINT_FCALL_ERROR("create fails", fcall); |
16cce6d2 | 282 | goto clunk_fid; |
2bad8471 EVH |
283 | } |
284 | ||
6a3124a3 LI |
285 | if (iounit) |
286 | *iounit = fcall->params.rcreate.iounit; | |
287 | ||
288 | if (qid) | |
289 | *qid = fcall->params.rcreate.qid; | |
290 | ||
291 | if (fidp) | |
292 | *fidp = fid; | |
293 | ||
2bad8471 | 294 | kfree(fcall); |
6a3124a3 | 295 | return 0; |
2bad8471 | 296 | |
16cce6d2 LI |
297 | clunk_fid: |
298 | v9fs_t_clunk(v9ses, fid); | |
299 | fid = V9FS_NOFID; | |
300 | ||
301 | put_fid: | |
9d7fa400 | 302 | if (fid != V9FS_NOFID) |
6a3124a3 | 303 | v9fs_put_idpool(fid, &v9ses->fidpool); |
2bad8471 | 304 | |
6a3124a3 LI |
305 | kfree(fcall); |
306 | return err; | |
307 | } | |
0b8dd177 | 308 | |
6a3124a3 LI |
309 | static struct v9fs_fid* |
310 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
311 | { | |
312 | int err; | |
736c4b85 | 313 | int nfid; |
6a3124a3 LI |
314 | struct v9fs_fid *ret; |
315 | struct v9fs_fcall *fcall; | |
316 | ||
317 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
318 | if (nfid < 0) { | |
0b8dd177 | 319 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 320 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
321 | } |
322 | ||
6a3124a3 LI |
323 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
324 | &fcall); | |
325 | ||
326 | if (err < 0) { | |
41e5a6ac LI |
327 | if (fcall && fcall->id == RWALK) |
328 | goto clunk_fid; | |
329 | ||
6a3124a3 LI |
330 | PRINT_FCALL_ERROR("walk error", fcall); |
331 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
332 | goto error; | |
0b8dd177 | 333 | } |
6a3124a3 | 334 | |
3cf6429a LI |
335 | kfree(fcall); |
336 | fcall = NULL; | |
6a3124a3 LI |
337 | ret = v9fs_fid_create(v9ses, nfid); |
338 | if (!ret) { | |
339 | err = -ENOMEM; | |
340 | goto clunk_fid; | |
341 | } | |
0b8dd177 | 342 | |
6a3124a3 LI |
343 | err = v9fs_fid_insert(ret, dentry); |
344 | if (err < 0) { | |
345 | v9fs_fid_destroy(ret); | |
346 | goto clunk_fid; | |
0b8dd177 | 347 | } |
2bad8471 | 348 | |
6a3124a3 | 349 | return ret; |
2bad8471 | 350 | |
6a3124a3 LI |
351 | clunk_fid: |
352 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 353 | |
6a3124a3 LI |
354 | error: |
355 | kfree(fcall); | |
356 | return ERR_PTR(err); | |
357 | } | |
2bad8471 | 358 | |
5174fdab | 359 | static struct inode * |
6a3124a3 LI |
360 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, |
361 | struct super_block *sb) | |
362 | { | |
363 | int err, umode; | |
364 | struct inode *ret; | |
365 | struct v9fs_fcall *fcall; | |
531b1094 | 366 | |
6a3124a3 LI |
367 | ret = NULL; |
368 | err = v9fs_t_stat(v9ses, fid, &fcall); | |
369 | if (err) { | |
370 | PRINT_FCALL_ERROR("stat error", fcall); | |
371 | goto error; | |
2bad8471 EVH |
372 | } |
373 | ||
6a3124a3 LI |
374 | umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); |
375 | ret = v9fs_get_inode(sb, umode); | |
376 | if (IS_ERR(ret)) { | |
377 | err = PTR_ERR(ret); | |
378 | ret = NULL; | |
379 | goto error; | |
380 | } | |
2bad8471 | 381 | |
6a3124a3 LI |
382 | v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); |
383 | kfree(fcall); | |
384 | return ret; | |
2bad8471 | 385 | |
6a3124a3 | 386 | error: |
2bad8471 | 387 | kfree(fcall); |
6a3124a3 LI |
388 | if (ret) |
389 | iput(ret); | |
2bad8471 | 390 | |
6a3124a3 | 391 | return ERR_PTR(err); |
2bad8471 EVH |
392 | } |
393 | ||
394 | /** | |
395 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
396 | * @dir: directory inode that is being deleted |
397 | * @file: dentry that is being deleted | |
398 | * @rmdir: removing a directory | |
2bad8471 EVH |
399 | * |
400 | */ | |
401 | ||
402 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
403 | { | |
404 | struct v9fs_fcall *fcall = NULL; | |
405 | struct super_block *sb = NULL; | |
406 | struct v9fs_session_info *v9ses = NULL; | |
407 | struct v9fs_fid *v9fid = NULL; | |
408 | struct inode *file_inode = NULL; | |
409 | int fid = -1; | |
410 | int result = 0; | |
411 | ||
412 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
413 | rmdir); | |
414 | ||
415 | file_inode = file->d_inode; | |
416 | sb = file_inode->i_sb; | |
417 | v9ses = v9fs_inode2v9ses(file_inode); | |
0b8dd177 | 418 | v9fid = v9fs_fid_lookup(file); |
da977b2c EVH |
419 | if(IS_ERR(v9fid)) |
420 | return PTR_ERR(v9fid); | |
2bad8471 EVH |
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); | |
da977b2c | 432 | goto Error; |
2bad8471 EVH |
433 | } |
434 | ||
834a9b8c EVH |
435 | v9fs_put_idpool(fid, &v9ses->fidpool); |
436 | v9fs_fid_destroy(v9fid); | |
437 | ||
da977b2c | 438 | Error: |
2bad8471 EVH |
439 | kfree(fcall); |
440 | return result; | |
441 | } | |
442 | ||
6a3124a3 LI |
443 | static int |
444 | v9fs_open_created(struct inode *inode, struct file *file) | |
445 | { | |
446 | return 0; | |
447 | } | |
448 | ||
2bad8471 EVH |
449 | /** |
450 | * v9fs_vfs_create - VFS hook to create files | |
451 | * @inode: directory inode that is being deleted | |
452 | * @dentry: dentry that is being deleted | |
6a3124a3 | 453 | * @mode: create permissions |
2bad8471 EVH |
454 | * @nd: path information |
455 | * | |
456 | */ | |
457 | ||
458 | static int | |
6a3124a3 | 459 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, |
2bad8471 EVH |
460 | struct nameidata *nd) |
461 | { | |
6a3124a3 LI |
462 | int err; |
463 | u32 fid, perm, iounit; | |
464 | int flags; | |
465 | struct v9fs_session_info *v9ses; | |
466 | struct v9fs_fid *dfid, *vfid, *ffid; | |
467 | struct inode *inode; | |
468 | struct v9fs_qid qid; | |
469 | struct file *filp; | |
470 | ||
471 | inode = NULL; | |
472 | vfid = NULL; | |
473 | v9ses = v9fs_inode2v9ses(dir); | |
da977b2c EVH |
474 | dfid = v9fs_fid_clone(dentry->d_parent); |
475 | if(IS_ERR(dfid)) { | |
476 | err = PTR_ERR(dfid); | |
477 | goto error; | |
478 | } | |
6a3124a3 | 479 | |
da977b2c | 480 | perm = unixmode2p9mode(v9ses, mode); |
6a3124a3 LI |
481 | if (nd && nd->flags & LOOKUP_OPEN) |
482 | flags = nd->intent.open.flags - 1; | |
483 | else | |
484 | flags = O_RDWR; | |
485 | ||
486 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 487 | perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit); |
6a3124a3 LI |
488 | |
489 | if (err) | |
da977b2c | 490 | goto clunk_dfid; |
6a3124a3 LI |
491 | |
492 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
da977b2c | 493 | v9fs_fid_clunk(v9ses, dfid); |
6a3124a3 LI |
494 | if (IS_ERR(vfid)) { |
495 | err = PTR_ERR(vfid); | |
496 | vfid = NULL; | |
497 | goto error; | |
498 | } | |
499 | ||
500 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
501 | if (IS_ERR(inode)) { | |
502 | err = PTR_ERR(inode); | |
503 | inode = NULL; | |
504 | goto error; | |
505 | } | |
506 | ||
507 | dentry->d_op = &v9fs_dentry_operations; | |
508 | d_instantiate(dentry, inode); | |
509 | ||
510 | if (nd && nd->flags & LOOKUP_OPEN) { | |
511 | ffid = v9fs_fid_create(v9ses, fid); | |
512 | if (!ffid) | |
513 | return -ENOMEM; | |
514 | ||
515 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); | |
516 | if (IS_ERR(filp)) { | |
517 | v9fs_fid_destroy(ffid); | |
518 | return PTR_ERR(filp); | |
519 | } | |
520 | ||
521 | ffid->rdir_pos = 0; | |
522 | ffid->rdir_fcall = NULL; | |
523 | ffid->fidopen = 1; | |
524 | ffid->iounit = iounit; | |
525 | ffid->filp = filp; | |
526 | filp->private_data = ffid; | |
527 | } | |
528 | ||
529 | return 0; | |
530 | ||
da977b2c EVH |
531 | clunk_dfid: |
532 | v9fs_fid_clunk(v9ses, dfid); | |
533 | ||
6a3124a3 LI |
534 | error: |
535 | if (vfid) | |
536 | v9fs_fid_destroy(vfid); | |
537 | ||
6a3124a3 | 538 | return err; |
2bad8471 EVH |
539 | } |
540 | ||
541 | /** | |
542 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 543 | * @inode: inode that is being unlinked |
2bad8471 EVH |
544 | * @dentry: dentry that is being unlinked |
545 | * @mode: mode for new directory | |
546 | * | |
547 | */ | |
548 | ||
6a3124a3 | 549 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 550 | { |
6a3124a3 LI |
551 | int err; |
552 | u32 fid, perm; | |
553 | struct v9fs_session_info *v9ses; | |
554 | struct v9fs_fid *dfid, *vfid; | |
555 | struct inode *inode; | |
556 | ||
557 | inode = NULL; | |
558 | vfid = NULL; | |
559 | v9ses = v9fs_inode2v9ses(dir); | |
da977b2c EVH |
560 | dfid = v9fs_fid_clone(dentry->d_parent); |
561 | if(IS_ERR(dfid)) { | |
562 | err = PTR_ERR(dfid); | |
563 | goto error; | |
564 | } | |
565 | ||
6a3124a3 LI |
566 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
567 | ||
568 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 569 | perm, V9FS_OREAD, NULL, &fid, NULL, NULL); |
6a3124a3 LI |
570 | |
571 | if (err) { | |
572 | dprintk(DEBUG_ERROR, "create error %d\n", err); | |
da977b2c | 573 | goto clean_up_dfid; |
6a3124a3 LI |
574 | } |
575 | ||
576 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
577 | if (IS_ERR(vfid)) { | |
578 | err = PTR_ERR(vfid); | |
579 | vfid = NULL; | |
da977b2c | 580 | goto clean_up_dfid; |
6a3124a3 LI |
581 | } |
582 | ||
da977b2c | 583 | v9fs_fid_clunk(v9ses, dfid); |
6a3124a3 LI |
584 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); |
585 | if (IS_ERR(inode)) { | |
586 | err = PTR_ERR(inode); | |
587 | inode = NULL; | |
835d90c4 AB |
588 | v9fs_fid_destroy(vfid); |
589 | goto error; | |
6a3124a3 LI |
590 | } |
591 | ||
592 | dentry->d_op = &v9fs_dentry_operations; | |
593 | d_instantiate(dentry, inode); | |
594 | return 0; | |
595 | ||
da977b2c EVH |
596 | clean_up_dfid: |
597 | v9fs_fid_clunk(v9ses, dfid); | |
598 | ||
599 | error: | |
6a3124a3 | 600 | return err; |
2bad8471 EVH |
601 | } |
602 | ||
603 | /** | |
604 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
605 | * @dir: inode that is being walked from | |
606 | * @dentry: dentry that is being walked to? | |
607 | * @nameidata: path data | |
608 | * | |
609 | */ | |
610 | ||
611 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
612 | struct nameidata *nameidata) | |
613 | { | |
614 | struct super_block *sb; | |
615 | struct v9fs_session_info *v9ses; | |
616 | struct v9fs_fid *dirfid; | |
617 | struct v9fs_fid *fid; | |
618 | struct inode *inode; | |
619 | struct v9fs_fcall *fcall = NULL; | |
2bad8471 EVH |
620 | int dirfidnum = -1; |
621 | int newfid = -1; | |
622 | int result = 0; | |
623 | ||
624 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
731805b4 | 625 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
626 | |
627 | sb = dir->i_sb; | |
628 | v9ses = v9fs_inode2v9ses(dir); | |
5e7a99ac | 629 | dentry->d_op = &v9fs_dentry_operations; |
0b8dd177 | 630 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 | 631 | |
da977b2c EVH |
632 | if(IS_ERR(dirfid)) |
633 | return ERR_PTR(PTR_ERR(dirfid)); | |
2bad8471 EVH |
634 | |
635 | dirfidnum = dirfid->fid; | |
636 | ||
2bad8471 EVH |
637 | newfid = v9fs_get_idpool(&v9ses->fidpool); |
638 | if (newfid < 0) { | |
639 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
da977b2c EVH |
640 | result = -ENOSPC; |
641 | goto Release_Dirfid; | |
2bad8471 EVH |
642 | } |
643 | ||
6a3124a3 | 644 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, |
41e5a6ac LI |
645 | (char *)dentry->d_name.name, &fcall); |
646 | ||
da977b2c EVH |
647 | up(&dirfid->lock); |
648 | ||
2bad8471 | 649 | if (result < 0) { |
41e5a6ac LI |
650 | if (fcall && fcall->id == RWALK) |
651 | v9fs_t_clunk(v9ses, newfid); | |
652 | else | |
653 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
654 | ||
2bad8471 EVH |
655 | if (result == -ENOENT) { |
656 | d_add(dentry, NULL); | |
0b8dd177 | 657 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
658 | "Return negative dentry %p count %d\n", |
659 | dentry, atomic_read(&dentry->d_count)); | |
41e5a6ac | 660 | kfree(fcall); |
2bad8471 EVH |
661 | return NULL; |
662 | } | |
663 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
664 | goto FreeFcall; | |
665 | } | |
41e5a6ac | 666 | kfree(fcall); |
2bad8471 EVH |
667 | |
668 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
669 | if (result < 0) { | |
670 | dprintk(DEBUG_ERROR, "stat error\n"); | |
671 | goto FreeFcall; | |
672 | } | |
673 | ||
531b1094 LI |
674 | inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, |
675 | fcall->params.rstat.stat.mode)); | |
2bad8471 EVH |
676 | |
677 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
678 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
679 | PTR_ERR(inode)); | |
680 | ||
681 | result = -ENOSPC; | |
682 | goto FreeFcall; | |
683 | } | |
684 | ||
531b1094 | 685 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
2bad8471 | 686 | |
6a3124a3 | 687 | fid = v9fs_fid_create(v9ses, newfid); |
2bad8471 EVH |
688 | if (fid == NULL) { |
689 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
690 | result = -ENOMEM; | |
691 | goto FreeFcall; | |
692 | } | |
693 | ||
6a3124a3 LI |
694 | result = v9fs_fid_insert(fid, dentry); |
695 | if (result < 0) | |
696 | goto FreeFcall; | |
697 | ||
531b1094 | 698 | fid->qid = fcall->params.rstat.stat.qid; |
531b1094 | 699 | v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); |
2bad8471 EVH |
700 | |
701 | d_add(dentry, inode); | |
702 | kfree(fcall); | |
703 | ||
704 | return NULL; | |
705 | ||
da977b2c EVH |
706 | Release_Dirfid: |
707 | up(&dirfid->lock); | |
708 | ||
709 | FreeFcall: | |
2bad8471 | 710 | kfree(fcall); |
da977b2c | 711 | |
2bad8471 EVH |
712 | return ERR_PTR(result); |
713 | } | |
714 | ||
715 | /** | |
716 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
717 | * @i: inode that is being unlinked | |
73c592b9 | 718 | * @d: dentry that is being unlinked |
2bad8471 EVH |
719 | * |
720 | */ | |
721 | ||
722 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
723 | { | |
724 | return v9fs_remove(i, d, 0); | |
725 | } | |
726 | ||
727 | /** | |
728 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
729 | * @i: inode that is being unlinked | |
73c592b9 | 730 | * @d: dentry that is being unlinked |
2bad8471 EVH |
731 | * |
732 | */ | |
733 | ||
734 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
735 | { | |
736 | return v9fs_remove(i, d, 1); | |
737 | } | |
738 | ||
739 | /** | |
740 | * v9fs_vfs_rename - VFS hook to rename an inode | |
741 | * @old_dir: old dir inode | |
742 | * @old_dentry: old dentry | |
743 | * @new_dir: new dir inode | |
744 | * @new_dentry: new dentry | |
745 | * | |
746 | */ | |
747 | ||
748 | static int | |
749 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
750 | struct inode *new_dir, struct dentry *new_dentry) | |
751 | { | |
752 | struct inode *old_inode = old_dentry->d_inode; | |
753 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 754 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
da977b2c EVH |
755 | struct v9fs_fid *olddirfid; |
756 | struct v9fs_fid *newdirfid; | |
531b1094 | 757 | struct v9fs_wstat wstat; |
2bad8471 EVH |
758 | struct v9fs_fcall *fcall = NULL; |
759 | int fid = -1; | |
760 | int olddirfidnum = -1; | |
761 | int newdirfidnum = -1; | |
762 | int retval = 0; | |
763 | ||
764 | dprintk(DEBUG_VFS, "\n"); | |
765 | ||
da977b2c EVH |
766 | if(IS_ERR(oldfid)) |
767 | return PTR_ERR(oldfid); | |
768 | ||
769 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
770 | if(IS_ERR(olddirfid)) { | |
771 | retval = PTR_ERR(olddirfid); | |
772 | goto Release_lock; | |
773 | } | |
774 | ||
775 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
776 | if(IS_ERR(newdirfid)) { | |
777 | retval = PTR_ERR(newdirfid); | |
778 | goto Clunk_olddir; | |
2bad8471 EVH |
779 | } |
780 | ||
781 | /* 9P can only handle file rename in the same directory */ | |
782 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
783 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
621997cd | 784 | retval = -EXDEV; |
da977b2c | 785 | goto Clunk_newdir; |
2bad8471 EVH |
786 | } |
787 | ||
788 | fid = oldfid->fid; | |
789 | olddirfidnum = olddirfid->fid; | |
790 | newdirfidnum = newdirfid->fid; | |
791 | ||
792 | if (fid < 0) { | |
793 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
794 | old_inode->i_ino); | |
795 | retval = -EBADF; | |
da977b2c | 796 | goto Clunk_newdir; |
2bad8471 EVH |
797 | } |
798 | ||
531b1094 LI |
799 | v9fs_blank_wstat(&wstat); |
800 | wstat.muid = v9ses->name; | |
801 | wstat.name = (char *) new_dentry->d_name.name; | |
2bad8471 | 802 | |
531b1094 | 803 | retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); |
2bad8471 | 804 | |
2bad8471 | 805 | if (retval < 0) |
531b1094 | 806 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 EVH |
807 | |
808 | kfree(fcall); | |
da977b2c EVH |
809 | |
810 | Clunk_newdir: | |
811 | v9fs_fid_clunk(v9ses, newdirfid); | |
812 | ||
813 | Clunk_olddir: | |
814 | v9fs_fid_clunk(v9ses, olddirfid); | |
815 | ||
816 | Release_lock: | |
817 | up(&oldfid->lock); | |
818 | ||
2bad8471 EVH |
819 | return retval; |
820 | } | |
821 | ||
822 | /** | |
943ffb58 | 823 | * v9fs_vfs_getattr - retrieve file metadata |
2bad8471 EVH |
824 | * @mnt - mount information |
825 | * @dentry - file to get attributes on | |
826 | * @stat - metadata structure to populate | |
827 | * | |
828 | */ | |
829 | ||
830 | static int | |
831 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
832 | struct kstat *stat) | |
833 | { | |
834 | struct v9fs_fcall *fcall = NULL; | |
835 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 836 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 EVH |
837 | int err = -EPERM; |
838 | ||
839 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
da977b2c EVH |
840 | if(IS_ERR(fid)) |
841 | return PTR_ERR(fid); | |
2bad8471 EVH |
842 | |
843 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
844 | ||
845 | if (err < 0) | |
846 | dprintk(DEBUG_ERROR, "stat error\n"); | |
847 | else { | |
531b1094 | 848 | v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, |
2bad8471 EVH |
849 | dentry->d_inode->i_sb); |
850 | generic_fillattr(dentry->d_inode, stat); | |
851 | } | |
852 | ||
853 | kfree(fcall); | |
da977b2c | 854 | v9fs_fid_clunk(v9ses, fid); |
2bad8471 EVH |
855 | return err; |
856 | } | |
857 | ||
858 | /** | |
859 | * v9fs_vfs_setattr - set file metadata | |
860 | * @dentry: file whose metadata to set | |
861 | * @iattr: metadata assignment structure | |
862 | * | |
863 | */ | |
864 | ||
865 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
866 | { | |
867 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 868 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 | 869 | struct v9fs_fcall *fcall = NULL; |
531b1094 | 870 | struct v9fs_wstat wstat; |
2bad8471 EVH |
871 | int res = -EPERM; |
872 | ||
873 | dprintk(DEBUG_VFS, "\n"); | |
da977b2c EVH |
874 | if(IS_ERR(fid)) |
875 | return PTR_ERR(fid); | |
2bad8471 | 876 | |
531b1094 | 877 | v9fs_blank_wstat(&wstat); |
2bad8471 | 878 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 879 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
880 | |
881 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 882 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
883 | |
884 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 885 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
886 | |
887 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 888 | wstat.length = iattr->ia_size; |
2bad8471 EVH |
889 | |
890 | if (v9ses->extended) { | |
531b1094 LI |
891 | if (iattr->ia_valid & ATTR_UID) |
892 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 893 | |
531b1094 LI |
894 | if (iattr->ia_valid & ATTR_GID) |
895 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
896 | } |
897 | ||
531b1094 | 898 | res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); |
2bad8471 EVH |
899 | |
900 | if (res < 0) | |
531b1094 | 901 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 | 902 | |
2bad8471 | 903 | kfree(fcall); |
2bad8471 EVH |
904 | if (res >= 0) |
905 | res = inode_setattr(dentry->d_inode, iattr); | |
906 | ||
da977b2c | 907 | v9fs_fid_clunk(v9ses, fid); |
2bad8471 EVH |
908 | return res; |
909 | } | |
910 | ||
911 | /** | |
531b1094 LI |
912 | * v9fs_stat2inode - populate an inode structure with mistat info |
913 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
914 | * @inode: inode to populate |
915 | * @sb: superblock of filesystem | |
916 | * | |
917 | */ | |
918 | ||
919 | void | |
531b1094 LI |
920 | v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, |
921 | struct super_block *sb) | |
2bad8471 | 922 | { |
1dac06b2 | 923 | int n; |
531b1094 | 924 | char ext[32]; |
2bad8471 EVH |
925 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
926 | ||
927 | inode->i_nlink = 1; | |
928 | ||
531b1094 LI |
929 | inode->i_atime.tv_sec = stat->atime; |
930 | inode->i_mtime.tv_sec = stat->mtime; | |
931 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 932 | |
531b1094 LI |
933 | inode->i_uid = v9ses->uid; |
934 | inode->i_gid = v9ses->gid; | |
2bad8471 EVH |
935 | |
936 | if (v9ses->extended) { | |
531b1094 LI |
937 | inode->i_uid = stat->n_uid; |
938 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
939 | } |
940 | ||
531b1094 | 941 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
942 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
943 | char type = 0; | |
944 | int major = -1; | |
945 | int minor = -1; | |
531b1094 | 946 | |
1dac06b2 LI |
947 | n = stat->extension.len; |
948 | if (n > sizeof(ext)-1) | |
949 | n = sizeof(ext)-1; | |
950 | memmove(ext, stat->extension.str, n); | |
951 | ext[n] = 0; | |
531b1094 | 952 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
953 | switch (type) { |
954 | case 'c': | |
955 | inode->i_mode &= ~S_IFBLK; | |
956 | inode->i_mode |= S_IFCHR; | |
957 | break; | |
958 | case 'b': | |
959 | break; | |
960 | default: | |
531b1094 LI |
961 | dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", |
962 | type, stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
963 | }; |
964 | inode->i_rdev = MKDEV(major, minor); | |
965 | } else | |
966 | inode->i_rdev = 0; | |
967 | ||
531b1094 | 968 | inode->i_size = stat->length; |
2bad8471 | 969 | |
2bad8471 | 970 | inode->i_blocks = |
ba52de12 | 971 | (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; |
2bad8471 EVH |
972 | } |
973 | ||
974 | /** | |
975 | * v9fs_qid2ino - convert qid into inode number | |
976 | * @qid: qid to hash | |
977 | * | |
978 | * BUG: potential for inode number collisions? | |
979 | */ | |
980 | ||
981 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
982 | { | |
983 | u64 path = qid->path + 2; | |
984 | ino_t i = 0; | |
985 | ||
986 | if (sizeof(ino_t) == sizeof(path)) | |
987 | memcpy(&i, &path, sizeof(ino_t)); | |
988 | else | |
989 | i = (ino_t) (path ^ (path >> 32)); | |
990 | ||
991 | return i; | |
992 | } | |
993 | ||
2bad8471 EVH |
994 | /** |
995 | * v9fs_readlink - read a symlink's location (internal version) | |
996 | * @dentry: dentry for symlink | |
73c592b9 | 997 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
998 | * @buflen: length of buffer |
999 | * | |
1000 | */ | |
1001 | ||
1002 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1003 | { | |
1004 | int retval = -EPERM; | |
1005 | ||
1006 | struct v9fs_fcall *fcall = NULL; | |
1007 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 1008 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 | 1009 | |
da977b2c EVH |
1010 | if(IS_ERR(fid)) |
1011 | return PTR_ERR(fid); | |
2bad8471 EVH |
1012 | |
1013 | if (!v9ses->extended) { | |
1014 | retval = -EBADF; | |
1015 | dprintk(DEBUG_ERROR, "not extended\n"); | |
da977b2c | 1016 | goto ClunkFid; |
2bad8471 EVH |
1017 | } |
1018 | ||
1019 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1020 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1021 | ||
1022 | if (retval < 0) { | |
1023 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1024 | goto FreeFcall; | |
1025 | } | |
1026 | ||
da977b2c EVH |
1027 | if (!fcall) { |
1028 | retval = -EIO; | |
1029 | goto ClunkFid; | |
1030 | } | |
2bad8471 | 1031 | |
531b1094 | 1032 | if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { |
2bad8471 EVH |
1033 | retval = -EINVAL; |
1034 | goto FreeFcall; | |
1035 | } | |
1036 | ||
1037 | /* copy extension buffer into buffer */ | |
6a3124a3 | 1038 | if (fcall->params.rstat.stat.extension.len < buflen) |
16cce6d2 | 1039 | buflen = fcall->params.rstat.stat.extension.len + 1; |
2bad8471 | 1040 | |
16cce6d2 | 1041 | memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); |
531b1094 | 1042 | buffer[buflen-1] = 0; |
2bad8471 | 1043 | |
16cce6d2 LI |
1044 | dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, |
1045 | fcall->params.rstat.stat.extension.str, buffer); | |
2bad8471 EVH |
1046 | retval = buflen; |
1047 | ||
da977b2c | 1048 | FreeFcall: |
2bad8471 EVH |
1049 | kfree(fcall); |
1050 | ||
da977b2c EVH |
1051 | ClunkFid: |
1052 | v9fs_fid_clunk(v9ses, fid); | |
1053 | ||
2bad8471 EVH |
1054 | return retval; |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * v9fs_vfs_readlink - read a symlink's location | |
1059 | * @dentry: dentry for symlink | |
1060 | * @buf: buffer to load symlink location into | |
1061 | * @buflen: length of buffer | |
1062 | * | |
1063 | */ | |
1064 | ||
1065 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1066 | int buflen) | |
1067 | { | |
1068 | int retval; | |
1069 | int ret; | |
1070 | char *link = __getname(); | |
1071 | ||
0710d36a FM |
1072 | if (unlikely(!link)) |
1073 | return -ENOMEM; | |
1074 | ||
a1f9d8d2 LI |
1075 | if (buflen > PATH_MAX) |
1076 | buflen = PATH_MAX; | |
2bad8471 EVH |
1077 | |
1078 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1079 | ||
1080 | retval = v9fs_readlink(dentry, link, buflen); | |
1081 | ||
1082 | if (retval > 0) { | |
1083 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1084 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1085 | ret); | |
1086 | retval = ret; | |
1087 | } | |
1088 | } | |
1089 | ||
ce44eeb6 | 1090 | __putname(link); |
2bad8471 EVH |
1091 | return retval; |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * v9fs_vfs_follow_link - follow a symlink path | |
1096 | * @dentry: dentry for symlink | |
1097 | * @nd: nameidata | |
1098 | * | |
1099 | */ | |
1100 | ||
1101 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1102 | { | |
1103 | int len = 0; | |
1104 | char *link = __getname(); | |
1105 | ||
1106 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1107 | ||
1108 | if (!link) | |
1109 | link = ERR_PTR(-ENOMEM); | |
1110 | else { | |
16cce6d2 | 1111 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1112 | |
1113 | if (len < 0) { | |
ce44eeb6 | 1114 | __putname(link); |
2bad8471 EVH |
1115 | link = ERR_PTR(len); |
1116 | } else | |
1117 | link[len] = 0; | |
1118 | } | |
1119 | nd_set_link(nd, link); | |
1120 | ||
1121 | return NULL; | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * v9fs_vfs_put_link - release a symlink path | |
1126 | * @dentry: dentry for symlink | |
1127 | * @nd: nameidata | |
1128 | * | |
1129 | */ | |
1130 | ||
1131 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1132 | { | |
1133 | char *s = nd_get_link(nd); | |
1134 | ||
1135 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1136 | if (!IS_ERR(s)) | |
ce44eeb6 | 1137 | __putname(s); |
2bad8471 EVH |
1138 | } |
1139 | ||
531b1094 LI |
1140 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1141 | int mode, const char *extension) | |
2bad8471 | 1142 | { |
6a3124a3 LI |
1143 | int err; |
1144 | u32 fid, perm; | |
531b1094 | 1145 | struct v9fs_session_info *v9ses; |
da977b2c EVH |
1146 | struct v9fs_fid *dfid, *vfid = NULL; |
1147 | struct inode *inode = NULL; | |
2bad8471 | 1148 | |
6a3124a3 | 1149 | v9ses = v9fs_inode2v9ses(dir); |
2bad8471 EVH |
1150 | if (!v9ses->extended) { |
1151 | dprintk(DEBUG_ERROR, "not extended\n"); | |
6a3124a3 | 1152 | return -EPERM; |
2bad8471 EVH |
1153 | } |
1154 | ||
da977b2c EVH |
1155 | dfid = v9fs_fid_clone(dentry->d_parent); |
1156 | if(IS_ERR(dfid)) { | |
1157 | err = PTR_ERR(dfid); | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | perm = unixmode2p9mode(v9ses, mode); | |
1162 | ||
6a3124a3 | 1163 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, |
16cce6d2 | 1164 | perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); |
2bad8471 | 1165 | |
6a3124a3 | 1166 | if (err) |
da977b2c | 1167 | goto clunk_dfid; |
6a3124a3 LI |
1168 | |
1169 | err = v9fs_t_clunk(v9ses, fid); | |
1170 | if (err) | |
da977b2c | 1171 | goto clunk_dfid; |
6a3124a3 LI |
1172 | |
1173 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
1174 | if (IS_ERR(vfid)) { | |
1175 | err = PTR_ERR(vfid); | |
1176 | vfid = NULL; | |
da977b2c | 1177 | goto clunk_dfid; |
6a3124a3 LI |
1178 | } |
1179 | ||
1180 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
1181 | if (IS_ERR(inode)) { | |
1182 | err = PTR_ERR(inode); | |
1183 | inode = NULL; | |
da977b2c | 1184 | goto free_vfid; |
2bad8471 EVH |
1185 | } |
1186 | ||
6a3124a3 LI |
1187 | dentry->d_op = &v9fs_dentry_operations; |
1188 | d_instantiate(dentry, inode); | |
1189 | return 0; | |
2bad8471 | 1190 | |
da977b2c EVH |
1191 | free_vfid: |
1192 | v9fs_fid_destroy(vfid); | |
1193 | ||
1194 | clunk_dfid: | |
1195 | v9fs_fid_clunk(v9ses, dfid); | |
6a3124a3 | 1196 | |
da977b2c | 1197 | error: |
6a3124a3 LI |
1198 | return err; |
1199 | ||
531b1094 LI |
1200 | } |
1201 | ||
1202 | /** | |
1203 | * v9fs_vfs_symlink - helper function to create symlinks | |
1204 | * @dir: directory inode containing symlink | |
1205 | * @dentry: dentry for symlink | |
1206 | * @symname: symlink data | |
1207 | * | |
1208 | * See 9P2000.u RFC for more information | |
1209 | * | |
1210 | */ | |
1211 | ||
1212 | static int | |
1213 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1214 | { | |
1215 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1216 | symname); | |
1217 | ||
1218 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1219 | } | |
1220 | ||
1221 | /** | |
1222 | * v9fs_vfs_link - create a hardlink | |
1223 | * @old_dentry: dentry for file to link to | |
1224 | * @dir: inode destination for new link | |
1225 | * @dentry: dentry for link | |
1226 | * | |
1227 | */ | |
1228 | ||
1229 | /* XXX - lots of code dup'd from symlink and creates, | |
1230 | * figure out a better reuse strategy | |
1231 | */ | |
1232 | ||
1233 | static int | |
1234 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1235 | struct dentry *dentry) | |
1236 | { | |
1237 | int retval; | |
da977b2c | 1238 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
531b1094 LI |
1239 | struct v9fs_fid *oldfid; |
1240 | char *name; | |
1241 | ||
1242 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1243 | old_dentry->d_name.name); | |
1244 | ||
da977b2c EVH |
1245 | oldfid = v9fs_fid_clone(old_dentry); |
1246 | if(IS_ERR(oldfid)) | |
1247 | return PTR_ERR(oldfid); | |
531b1094 LI |
1248 | |
1249 | name = __getname(); | |
da977b2c EVH |
1250 | if (unlikely(!name)) { |
1251 | retval = -ENOMEM; | |
1252 | goto clunk_fid; | |
1253 | } | |
0710d36a | 1254 | |
16cce6d2 | 1255 | sprintf(name, "%d\n", oldfid->fid); |
531b1094 LI |
1256 | retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); |
1257 | __putname(name); | |
2bad8471 | 1258 | |
da977b2c EVH |
1259 | clunk_fid: |
1260 | v9fs_fid_clunk(v9ses, oldfid); | |
2bad8471 EVH |
1261 | return retval; |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * v9fs_vfs_mknod - create a special file | |
1266 | * @dir: inode destination for new link | |
1267 | * @dentry: dentry for file | |
1268 | * @mode: mode for creation | |
1269 | * @dev_t: device associated with special file | |
1270 | * | |
1271 | */ | |
1272 | ||
1273 | static int | |
1274 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1275 | { | |
531b1094 LI |
1276 | int retval; |
1277 | char *name; | |
2bad8471 EVH |
1278 | |
1279 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1280 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1281 | ||
531b1094 LI |
1282 | if (!new_valid_dev(rdev)) |
1283 | return -EINVAL; | |
2bad8471 | 1284 | |
531b1094 | 1285 | name = __getname(); |
c0291a05 ET |
1286 | if (!name) |
1287 | return -ENOMEM; | |
2bad8471 EVH |
1288 | /* build extension */ |
1289 | if (S_ISBLK(mode)) | |
531b1094 | 1290 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1291 | else if (S_ISCHR(mode)) |
531b1094 | 1292 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1293 | else if (S_ISFIFO(mode)) |
531b1094 | 1294 | *name = 0; |
2bad8471 | 1295 | else { |
531b1094 LI |
1296 | __putname(name); |
1297 | return -EINVAL; | |
2bad8471 EVH |
1298 | } |
1299 | ||
531b1094 LI |
1300 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1301 | __putname(name); | |
2bad8471 EVH |
1302 | |
1303 | return retval; | |
1304 | } | |
1305 | ||
b501611a | 1306 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1307 | .create = v9fs_vfs_create, |
1308 | .lookup = v9fs_vfs_lookup, | |
1309 | .symlink = v9fs_vfs_symlink, | |
1310 | .link = v9fs_vfs_link, | |
1311 | .unlink = v9fs_vfs_unlink, | |
1312 | .mkdir = v9fs_vfs_mkdir, | |
1313 | .rmdir = v9fs_vfs_rmdir, | |
1314 | .mknod = v9fs_vfs_mknod, | |
1315 | .rename = v9fs_vfs_rename, | |
1316 | .readlink = v9fs_vfs_readlink, | |
1317 | .getattr = v9fs_vfs_getattr, | |
1318 | .setattr = v9fs_vfs_setattr, | |
1319 | }; | |
1320 | ||
b501611a EVH |
1321 | static struct inode_operations v9fs_dir_inode_operations = { |
1322 | .create = v9fs_vfs_create, | |
1323 | .lookup = v9fs_vfs_lookup, | |
1324 | .unlink = v9fs_vfs_unlink, | |
1325 | .mkdir = v9fs_vfs_mkdir, | |
1326 | .rmdir = v9fs_vfs_rmdir, | |
1327 | .mknod = v9fs_vfs_mknod, | |
1328 | .rename = v9fs_vfs_rename, | |
1329 | .getattr = v9fs_vfs_getattr, | |
1330 | .setattr = v9fs_vfs_setattr, | |
1331 | }; | |
1332 | ||
2bad8471 EVH |
1333 | static struct inode_operations v9fs_file_inode_operations = { |
1334 | .getattr = v9fs_vfs_getattr, | |
1335 | .setattr = v9fs_vfs_setattr, | |
1336 | }; | |
1337 | ||
1338 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1339 | .readlink = v9fs_vfs_readlink, | |
1340 | .follow_link = v9fs_vfs_follow_link, | |
1341 | .put_link = v9fs_vfs_put_link, | |
1342 | .getattr = v9fs_vfs_getattr, | |
1343 | .setattr = v9fs_vfs_setattr, | |
1344 | }; |