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 | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
2bad8471 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
2bad8471 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/namei.h> | |
35 | #include <linux/idr.h> | |
36 | ||
37 | #include "debug.h" | |
38 | #include "v9fs.h" | |
39 | #include "9p.h" | |
40 | #include "v9fs_vfs.h" | |
2bad8471 EVH |
41 | #include "fid.h" |
42 | ||
754661f1 AV |
43 | static const struct inode_operations v9fs_dir_inode_operations; |
44 | static const struct inode_operations v9fs_dir_inode_operations_ext; | |
45 | static const struct inode_operations v9fs_file_inode_operations; | |
46 | static const struct inode_operations v9fs_symlink_inode_operations; | |
2bad8471 EVH |
47 | |
48 | /** | |
49 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
50 | * @v9ses: v9fs session information | |
51 | * @mode: mode to convert | |
52 | * | |
53 | */ | |
54 | ||
73c592b9 | 55 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
56 | { |
57 | int res; | |
58 | res = mode & 0777; | |
59 | if (S_ISDIR(mode)) | |
60 | res |= V9FS_DMDIR; | |
61 | if (v9ses->extended) { | |
62 | if (S_ISLNK(mode)) | |
63 | res |= V9FS_DMSYMLINK; | |
64 | if (v9ses->nodev == 0) { | |
65 | if (S_ISSOCK(mode)) | |
66 | res |= V9FS_DMSOCKET; | |
67 | if (S_ISFIFO(mode)) | |
68 | res |= V9FS_DMNAMEDPIPE; | |
69 | if (S_ISBLK(mode)) | |
70 | res |= V9FS_DMDEVICE; | |
71 | if (S_ISCHR(mode)) | |
72 | res |= V9FS_DMDEVICE; | |
73 | } | |
74 | ||
75 | if ((mode & S_ISUID) == S_ISUID) | |
76 | res |= V9FS_DMSETUID; | |
77 | if ((mode & S_ISGID) == S_ISGID) | |
78 | res |= V9FS_DMSETGID; | |
79 | if ((mode & V9FS_DMLINK)) | |
80 | res |= V9FS_DMLINK; | |
81 | } | |
82 | ||
83 | return res; | |
84 | } | |
85 | ||
86 | /** | |
87 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
88 | * @v9ses: v9fs session information | |
89 | * @mode: mode to convert | |
90 | * | |
91 | */ | |
92 | ||
73c592b9 | 93 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
94 | { |
95 | int res; | |
96 | ||
97 | res = mode & 0777; | |
98 | ||
99 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) | |
100 | res |= S_IFDIR; | |
101 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) | |
102 | res |= S_IFLNK; | |
103 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) | |
104 | && (v9ses->nodev == 0)) | |
105 | res |= S_IFSOCK; | |
106 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) | |
107 | && (v9ses->nodev == 0)) | |
108 | res |= S_IFIFO; | |
109 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) | |
110 | && (v9ses->nodev == 0)) | |
111 | res |= S_IFBLK; | |
112 | else | |
113 | res |= S_IFREG; | |
114 | ||
115 | if (v9ses->extended) { | |
116 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) | |
117 | res |= S_ISUID; | |
118 | ||
119 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) | |
120 | res |= S_ISGID; | |
121 | } | |
122 | ||
123 | return res; | |
124 | } | |
125 | ||
6a3124a3 LI |
126 | int v9fs_uflags2omode(int uflags) |
127 | { | |
128 | int ret; | |
129 | ||
130 | ret = 0; | |
131 | switch (uflags&3) { | |
132 | default: | |
133 | case O_RDONLY: | |
134 | ret = V9FS_OREAD; | |
135 | break; | |
136 | ||
137 | case O_WRONLY: | |
138 | ret = V9FS_OWRITE; | |
139 | break; | |
140 | ||
141 | case O_RDWR: | |
142 | ret = V9FS_ORDWR; | |
143 | break; | |
144 | } | |
145 | ||
146 | if (uflags & O_EXCL) | |
147 | ret |= V9FS_OEXCL; | |
148 | ||
149 | if (uflags & O_TRUNC) | |
150 | ret |= V9FS_OTRUNC; | |
151 | ||
152 | if (uflags & O_APPEND) | |
153 | ret |= V9FS_OAPPEND; | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
2bad8471 | 158 | /** |
531b1094 | 159 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
2bad8471 | 160 | * @v9ses: 9P session info (for determining extended mode) |
531b1094 | 161 | * @wstat: structure to initialize |
2bad8471 EVH |
162 | * |
163 | */ | |
164 | ||
73c592b9 | 165 | static void |
531b1094 | 166 | v9fs_blank_wstat(struct v9fs_wstat *wstat) |
2bad8471 | 167 | { |
531b1094 LI |
168 | wstat->type = ~0; |
169 | wstat->dev = ~0; | |
170 | wstat->qid.type = ~0; | |
171 | wstat->qid.version = ~0; | |
172 | *((long long *)&wstat->qid.path) = ~0; | |
173 | wstat->mode = ~0; | |
174 | wstat->atime = ~0; | |
175 | wstat->mtime = ~0; | |
176 | wstat->length = ~0; | |
177 | wstat->name = NULL; | |
178 | wstat->uid = NULL; | |
179 | wstat->gid = NULL; | |
180 | wstat->muid = NULL; | |
181 | wstat->n_uid = ~0; | |
182 | wstat->n_gid = ~0; | |
183 | wstat->n_muid = ~0; | |
184 | wstat->extension = NULL; | |
2bad8471 EVH |
185 | } |
186 | ||
187 | /** | |
188 | * v9fs_get_inode - helper function to setup an inode | |
189 | * @sb: superblock | |
190 | * @mode: mode to setup inode with | |
191 | * | |
192 | */ | |
193 | ||
194 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
195 | { | |
6a3124a3 | 196 | struct inode *inode; |
b501611a | 197 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 EVH |
198 | |
199 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
200 | ||
201 | inode = new_inode(sb); | |
202 | if (inode) { | |
203 | inode->i_mode = mode; | |
204 | inode->i_uid = current->fsuid; | |
205 | inode->i_gid = current->fsgid; | |
2bad8471 EVH |
206 | inode->i_blocks = 0; |
207 | inode->i_rdev = 0; | |
208 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
147b31cf | 209 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
2bad8471 EVH |
210 | |
211 | switch (mode & S_IFMT) { | |
212 | case S_IFIFO: | |
213 | case S_IFBLK: | |
214 | case S_IFCHR: | |
215 | case S_IFSOCK: | |
b501611a EVH |
216 | if(!v9ses->extended) { |
217 | dprintk(DEBUG_ERROR, "special files without extended mode\n"); | |
218 | return ERR_PTR(-EINVAL); | |
219 | } | |
5d58bec5 EVH |
220 | init_special_inode(inode, inode->i_mode, |
221 | inode->i_rdev); | |
222 | break; | |
2bad8471 EVH |
223 | case S_IFREG: |
224 | inode->i_op = &v9fs_file_inode_operations; | |
225 | inode->i_fop = &v9fs_file_operations; | |
226 | break; | |
b501611a EVH |
227 | case S_IFLNK: |
228 | if(!v9ses->extended) { | |
229 | dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); | |
230 | return ERR_PTR(-EINVAL); | |
231 | } | |
232 | inode->i_op = &v9fs_symlink_inode_operations; | |
233 | break; | |
2bad8471 | 234 | case S_IFDIR: |
d8c76e6f | 235 | inc_nlink(inode); |
b501611a EVH |
236 | if(v9ses->extended) |
237 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
238 | else | |
239 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
240 | inode->i_fop = &v9fs_dir_operations; |
241 | break; | |
2bad8471 EVH |
242 | default: |
243 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
244 | mode, mode & S_IFMT); | |
245 | return ERR_PTR(-EINVAL); | |
246 | } | |
247 | } else { | |
248 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
249 | return ERR_PTR(-ENOMEM); | |
250 | } | |
251 | return inode; | |
252 | } | |
253 | ||
2bad8471 | 254 | static int |
16cce6d2 LI |
255 | v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, |
256 | u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) | |
2bad8471 | 257 | { |
736c4b85 | 258 | int fid; |
3cf6429a | 259 | int err; |
6a3124a3 | 260 | struct v9fs_fcall *fcall; |
2bad8471 | 261 | |
6a3124a3 LI |
262 | fid = v9fs_get_idpool(&v9ses->fidpool); |
263 | if (fid < 0) { | |
2bad8471 | 264 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 265 | return -ENOSPC; |
2bad8471 EVH |
266 | } |
267 | ||
6a3124a3 LI |
268 | err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); |
269 | if (err < 0) { | |
531b1094 | 270 | PRINT_FCALL_ERROR("clone error", fcall); |
41e5a6ac LI |
271 | if (fcall && fcall->id == RWALK) |
272 | goto clunk_fid; | |
273 | else | |
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: | |
9d7fa400 | 301 | if (fid != V9FS_NOFID) |
6a3124a3 | 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; | |
736c4b85 | 312 | int nfid; |
6a3124a3 LI |
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) { | |
41e5a6ac LI |
326 | if (fcall && fcall->id == RWALK) |
327 | goto clunk_fid; | |
328 | ||
6a3124a3 LI |
329 | PRINT_FCALL_ERROR("walk error", fcall); |
330 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
331 | goto error; | |
0b8dd177 | 332 | } |
6a3124a3 | 333 | |
3cf6429a LI |
334 | kfree(fcall); |
335 | fcall = NULL; | |
6a3124a3 LI |
336 | ret = v9fs_fid_create(v9ses, nfid); |
337 | if (!ret) { | |
338 | err = -ENOMEM; | |
339 | goto clunk_fid; | |
340 | } | |
0b8dd177 | 341 | |
6a3124a3 LI |
342 | err = v9fs_fid_insert(ret, dentry); |
343 | if (err < 0) { | |
344 | v9fs_fid_destroy(ret); | |
345 | goto clunk_fid; | |
0b8dd177 | 346 | } |
2bad8471 | 347 | |
6a3124a3 | 348 | return ret; |
2bad8471 | 349 | |
6a3124a3 LI |
350 | clunk_fid: |
351 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 352 | |
6a3124a3 LI |
353 | error: |
354 | kfree(fcall); | |
355 | return ERR_PTR(err); | |
356 | } | |
2bad8471 | 357 | |
5174fdab | 358 | static struct inode * |
6a3124a3 LI |
359 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, |
360 | struct super_block *sb) | |
361 | { | |
362 | int err, umode; | |
363 | struct inode *ret; | |
364 | struct v9fs_fcall *fcall; | |
531b1094 | 365 | |
6a3124a3 LI |
366 | ret = NULL; |
367 | err = v9fs_t_stat(v9ses, fid, &fcall); | |
368 | if (err) { | |
369 | PRINT_FCALL_ERROR("stat error", fcall); | |
370 | goto error; | |
2bad8471 EVH |
371 | } |
372 | ||
6a3124a3 LI |
373 | umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); |
374 | ret = v9fs_get_inode(sb, umode); | |
375 | if (IS_ERR(ret)) { | |
376 | err = PTR_ERR(ret); | |
377 | ret = NULL; | |
378 | goto error; | |
379 | } | |
2bad8471 | 380 | |
6a3124a3 LI |
381 | v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); |
382 | kfree(fcall); | |
383 | return ret; | |
2bad8471 | 384 | |
6a3124a3 | 385 | error: |
2bad8471 | 386 | kfree(fcall); |
6a3124a3 LI |
387 | if (ret) |
388 | iput(ret); | |
2bad8471 | 389 | |
6a3124a3 | 390 | return ERR_PTR(err); |
2bad8471 EVH |
391 | } |
392 | ||
393 | /** | |
394 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
395 | * @dir: directory inode that is being deleted |
396 | * @file: dentry that is being deleted | |
397 | * @rmdir: removing a directory | |
2bad8471 EVH |
398 | * |
399 | */ | |
400 | ||
401 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
402 | { | |
403 | struct v9fs_fcall *fcall = NULL; | |
404 | struct super_block *sb = NULL; | |
405 | struct v9fs_session_info *v9ses = NULL; | |
406 | struct v9fs_fid *v9fid = NULL; | |
407 | struct inode *file_inode = NULL; | |
408 | int fid = -1; | |
409 | int result = 0; | |
410 | ||
411 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
412 | rmdir); | |
413 | ||
414 | file_inode = file->d_inode; | |
415 | sb = file_inode->i_sb; | |
416 | v9ses = v9fs_inode2v9ses(file_inode); | |
c959df9f | 417 | v9fid = v9fs_fid_clone(file); |
da977b2c EVH |
418 | if(IS_ERR(v9fid)) |
419 | return PTR_ERR(v9fid); | |
2bad8471 EVH |
420 | |
421 | fid = v9fid->fid; | |
422 | if (fid < 0) { | |
423 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
424 | file_inode->i_ino); | |
425 | return -EBADF; | |
426 | } | |
427 | ||
428 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
531b1094 LI |
429 | if (result < 0) { |
430 | PRINT_FCALL_ERROR("remove fails", fcall); | |
da977b2c | 431 | goto Error; |
2bad8471 EVH |
432 | } |
433 | ||
834a9b8c EVH |
434 | v9fs_put_idpool(fid, &v9ses->fidpool); |
435 | v9fs_fid_destroy(v9fid); | |
436 | ||
da977b2c | 437 | Error: |
2bad8471 EVH |
438 | kfree(fcall); |
439 | return result; | |
440 | } | |
441 | ||
6a3124a3 LI |
442 | static int |
443 | v9fs_open_created(struct inode *inode, struct file *file) | |
444 | { | |
445 | return 0; | |
446 | } | |
447 | ||
2bad8471 EVH |
448 | /** |
449 | * v9fs_vfs_create - VFS hook to create files | |
450 | * @inode: directory inode that is being deleted | |
451 | * @dentry: dentry that is being deleted | |
6a3124a3 | 452 | * @mode: create permissions |
2bad8471 EVH |
453 | * @nd: path information |
454 | * | |
455 | */ | |
456 | ||
457 | static int | |
6a3124a3 | 458 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, |
2bad8471 EVH |
459 | struct nameidata *nd) |
460 | { | |
6a3124a3 LI |
461 | int err; |
462 | u32 fid, perm, iounit; | |
463 | int flags; | |
464 | struct v9fs_session_info *v9ses; | |
465 | struct v9fs_fid *dfid, *vfid, *ffid; | |
466 | struct inode *inode; | |
467 | struct v9fs_qid qid; | |
468 | struct file *filp; | |
469 | ||
470 | inode = NULL; | |
471 | vfid = NULL; | |
472 | v9ses = v9fs_inode2v9ses(dir); | |
da977b2c EVH |
473 | dfid = v9fs_fid_clone(dentry->d_parent); |
474 | if(IS_ERR(dfid)) { | |
475 | err = PTR_ERR(dfid); | |
476 | goto error; | |
477 | } | |
6a3124a3 | 478 | |
da977b2c | 479 | perm = unixmode2p9mode(v9ses, mode); |
6a3124a3 LI |
480 | if (nd && nd->flags & LOOKUP_OPEN) |
481 | flags = nd->intent.open.flags - 1; | |
482 | else | |
483 | flags = O_RDWR; | |
484 | ||
485 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 486 | perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit); |
6a3124a3 LI |
487 | |
488 | if (err) | |
da977b2c | 489 | goto clunk_dfid; |
6a3124a3 LI |
490 | |
491 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
da977b2c | 492 | v9fs_fid_clunk(v9ses, dfid); |
6a3124a3 LI |
493 | if (IS_ERR(vfid)) { |
494 | err = PTR_ERR(vfid); | |
495 | vfid = NULL; | |
496 | goto error; | |
497 | } | |
498 | ||
499 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
500 | if (IS_ERR(inode)) { | |
501 | err = PTR_ERR(inode); | |
502 | inode = NULL; | |
503 | goto error; | |
504 | } | |
505 | ||
e03abc0c EVH |
506 | if(v9ses->cache) |
507 | dentry->d_op = &v9fs_cached_dentry_operations; | |
508 | else | |
509 | dentry->d_op = &v9fs_dentry_operations; | |
6a3124a3 LI |
510 | d_instantiate(dentry, inode); |
511 | ||
512 | if (nd && nd->flags & LOOKUP_OPEN) { | |
513 | ffid = v9fs_fid_create(v9ses, fid); | |
514 | if (!ffid) | |
515 | return -ENOMEM; | |
516 | ||
517 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); | |
518 | if (IS_ERR(filp)) { | |
519 | v9fs_fid_destroy(ffid); | |
520 | return PTR_ERR(filp); | |
521 | } | |
522 | ||
523 | ffid->rdir_pos = 0; | |
524 | ffid->rdir_fcall = NULL; | |
525 | ffid->fidopen = 1; | |
526 | ffid->iounit = iounit; | |
527 | ffid->filp = filp; | |
528 | filp->private_data = ffid; | |
529 | } | |
530 | ||
531 | return 0; | |
532 | ||
da977b2c EVH |
533 | clunk_dfid: |
534 | v9fs_fid_clunk(v9ses, dfid); | |
535 | ||
6a3124a3 LI |
536 | error: |
537 | if (vfid) | |
538 | v9fs_fid_destroy(vfid); | |
539 | ||
6a3124a3 | 540 | return err; |
2bad8471 EVH |
541 | } |
542 | ||
543 | /** | |
544 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 545 | * @inode: inode that is being unlinked |
2bad8471 EVH |
546 | * @dentry: dentry that is being unlinked |
547 | * @mode: mode for new directory | |
548 | * | |
549 | */ | |
550 | ||
6a3124a3 | 551 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 552 | { |
6a3124a3 LI |
553 | int err; |
554 | u32 fid, perm; | |
555 | struct v9fs_session_info *v9ses; | |
556 | struct v9fs_fid *dfid, *vfid; | |
557 | struct inode *inode; | |
558 | ||
559 | inode = NULL; | |
560 | vfid = NULL; | |
561 | v9ses = v9fs_inode2v9ses(dir); | |
da977b2c EVH |
562 | dfid = v9fs_fid_clone(dentry->d_parent); |
563 | if(IS_ERR(dfid)) { | |
564 | err = PTR_ERR(dfid); | |
565 | goto error; | |
566 | } | |
567 | ||
6a3124a3 LI |
568 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
569 | ||
570 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, | |
16cce6d2 | 571 | perm, V9FS_OREAD, NULL, &fid, NULL, NULL); |
6a3124a3 LI |
572 | |
573 | if (err) { | |
574 | dprintk(DEBUG_ERROR, "create error %d\n", err); | |
da977b2c | 575 | goto clean_up_dfid; |
6a3124a3 LI |
576 | } |
577 | ||
578 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
579 | if (IS_ERR(vfid)) { | |
580 | err = PTR_ERR(vfid); | |
581 | vfid = NULL; | |
da977b2c | 582 | goto clean_up_dfid; |
6a3124a3 LI |
583 | } |
584 | ||
da977b2c | 585 | v9fs_fid_clunk(v9ses, dfid); |
6a3124a3 LI |
586 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); |
587 | if (IS_ERR(inode)) { | |
588 | err = PTR_ERR(inode); | |
589 | inode = NULL; | |
835d90c4 AB |
590 | v9fs_fid_destroy(vfid); |
591 | goto error; | |
6a3124a3 LI |
592 | } |
593 | ||
e03abc0c EVH |
594 | if(v9ses->cache) |
595 | dentry->d_op = &v9fs_cached_dentry_operations; | |
596 | else | |
597 | dentry->d_op = &v9fs_dentry_operations; | |
6a3124a3 LI |
598 | d_instantiate(dentry, inode); |
599 | return 0; | |
600 | ||
da977b2c EVH |
601 | clean_up_dfid: |
602 | v9fs_fid_clunk(v9ses, dfid); | |
603 | ||
604 | error: | |
6a3124a3 | 605 | return err; |
2bad8471 EVH |
606 | } |
607 | ||
608 | /** | |
609 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
610 | * @dir: inode that is being walked from | |
611 | * @dentry: dentry that is being walked to? | |
612 | * @nameidata: path data | |
613 | * | |
614 | */ | |
615 | ||
616 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
617 | struct nameidata *nameidata) | |
618 | { | |
619 | struct super_block *sb; | |
620 | struct v9fs_session_info *v9ses; | |
621 | struct v9fs_fid *dirfid; | |
622 | struct v9fs_fid *fid; | |
623 | struct inode *inode; | |
624 | struct v9fs_fcall *fcall = NULL; | |
2bad8471 EVH |
625 | int dirfidnum = -1; |
626 | int newfid = -1; | |
627 | int result = 0; | |
628 | ||
629 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
731805b4 | 630 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
631 | |
632 | sb = dir->i_sb; | |
633 | v9ses = v9fs_inode2v9ses(dir); | |
0b8dd177 | 634 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 | 635 | |
da977b2c EVH |
636 | if(IS_ERR(dirfid)) |
637 | return ERR_PTR(PTR_ERR(dirfid)); | |
2bad8471 EVH |
638 | |
639 | dirfidnum = dirfid->fid; | |
640 | ||
2bad8471 EVH |
641 | newfid = v9fs_get_idpool(&v9ses->fidpool); |
642 | if (newfid < 0) { | |
643 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
da977b2c EVH |
644 | result = -ENOSPC; |
645 | goto Release_Dirfid; | |
2bad8471 EVH |
646 | } |
647 | ||
6a3124a3 | 648 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, |
41e5a6ac LI |
649 | (char *)dentry->d_name.name, &fcall); |
650 | ||
da977b2c EVH |
651 | up(&dirfid->lock); |
652 | ||
2bad8471 | 653 | if (result < 0) { |
41e5a6ac LI |
654 | if (fcall && fcall->id == RWALK) |
655 | v9fs_t_clunk(v9ses, newfid); | |
656 | else | |
657 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
658 | ||
2bad8471 EVH |
659 | if (result == -ENOENT) { |
660 | d_add(dentry, NULL); | |
0b8dd177 | 661 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
662 | "Return negative dentry %p count %d\n", |
663 | dentry, atomic_read(&dentry->d_count)); | |
41e5a6ac | 664 | kfree(fcall); |
2bad8471 EVH |
665 | return NULL; |
666 | } | |
667 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
668 | goto FreeFcall; | |
669 | } | |
41e5a6ac | 670 | kfree(fcall); |
2bad8471 EVH |
671 | |
672 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
673 | if (result < 0) { | |
674 | dprintk(DEBUG_ERROR, "stat error\n"); | |
675 | goto FreeFcall; | |
676 | } | |
677 | ||
531b1094 LI |
678 | inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, |
679 | fcall->params.rstat.stat.mode)); | |
2bad8471 EVH |
680 | |
681 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
682 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
683 | PTR_ERR(inode)); | |
684 | ||
685 | result = -ENOSPC; | |
686 | goto FreeFcall; | |
687 | } | |
688 | ||
531b1094 | 689 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
2bad8471 | 690 | |
6a3124a3 | 691 | fid = v9fs_fid_create(v9ses, newfid); |
2bad8471 EVH |
692 | if (fid == NULL) { |
693 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
694 | result = -ENOMEM; | |
695 | goto FreeFcall; | |
696 | } | |
697 | ||
6a3124a3 LI |
698 | result = v9fs_fid_insert(fid, dentry); |
699 | if (result < 0) | |
700 | goto FreeFcall; | |
701 | ||
531b1094 | 702 | fid->qid = fcall->params.rstat.stat.qid; |
531b1094 | 703 | v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); |
e03abc0c EVH |
704 | if((fid->qid.version)&&(v9ses->cache)) |
705 | dentry->d_op = &v9fs_cached_dentry_operations; | |
706 | else | |
707 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
708 | |
709 | d_add(dentry, inode); | |
710 | kfree(fcall); | |
711 | ||
712 | return NULL; | |
713 | ||
da977b2c EVH |
714 | Release_Dirfid: |
715 | up(&dirfid->lock); | |
716 | ||
717 | FreeFcall: | |
2bad8471 | 718 | kfree(fcall); |
da977b2c | 719 | |
2bad8471 EVH |
720 | return ERR_PTR(result); |
721 | } | |
722 | ||
723 | /** | |
724 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
725 | * @i: inode that is being unlinked | |
73c592b9 | 726 | * @d: dentry that is being unlinked |
2bad8471 EVH |
727 | * |
728 | */ | |
729 | ||
730 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
731 | { | |
732 | return v9fs_remove(i, d, 0); | |
733 | } | |
734 | ||
735 | /** | |
736 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
737 | * @i: inode that is being unlinked | |
73c592b9 | 738 | * @d: dentry that is being unlinked |
2bad8471 EVH |
739 | * |
740 | */ | |
741 | ||
742 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
743 | { | |
744 | return v9fs_remove(i, d, 1); | |
745 | } | |
746 | ||
747 | /** | |
748 | * v9fs_vfs_rename - VFS hook to rename an inode | |
749 | * @old_dir: old dir inode | |
750 | * @old_dentry: old dentry | |
751 | * @new_dir: new dir inode | |
752 | * @new_dentry: new dentry | |
753 | * | |
754 | */ | |
755 | ||
756 | static int | |
757 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
758 | struct inode *new_dir, struct dentry *new_dentry) | |
759 | { | |
760 | struct inode *old_inode = old_dentry->d_inode; | |
761 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 762 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
da977b2c EVH |
763 | struct v9fs_fid *olddirfid; |
764 | struct v9fs_fid *newdirfid; | |
531b1094 | 765 | struct v9fs_wstat wstat; |
2bad8471 EVH |
766 | struct v9fs_fcall *fcall = NULL; |
767 | int fid = -1; | |
768 | int olddirfidnum = -1; | |
769 | int newdirfidnum = -1; | |
770 | int retval = 0; | |
771 | ||
772 | dprintk(DEBUG_VFS, "\n"); | |
773 | ||
da977b2c EVH |
774 | if(IS_ERR(oldfid)) |
775 | return PTR_ERR(oldfid); | |
776 | ||
777 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
778 | if(IS_ERR(olddirfid)) { | |
779 | retval = PTR_ERR(olddirfid); | |
780 | goto Release_lock; | |
781 | } | |
782 | ||
783 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
784 | if(IS_ERR(newdirfid)) { | |
785 | retval = PTR_ERR(newdirfid); | |
786 | goto Clunk_olddir; | |
2bad8471 EVH |
787 | } |
788 | ||
789 | /* 9P can only handle file rename in the same directory */ | |
790 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
791 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
621997cd | 792 | retval = -EXDEV; |
da977b2c | 793 | goto Clunk_newdir; |
2bad8471 EVH |
794 | } |
795 | ||
796 | fid = oldfid->fid; | |
797 | olddirfidnum = olddirfid->fid; | |
798 | newdirfidnum = newdirfid->fid; | |
799 | ||
800 | if (fid < 0) { | |
801 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
802 | old_inode->i_ino); | |
803 | retval = -EBADF; | |
da977b2c | 804 | goto Clunk_newdir; |
2bad8471 EVH |
805 | } |
806 | ||
531b1094 LI |
807 | v9fs_blank_wstat(&wstat); |
808 | wstat.muid = v9ses->name; | |
809 | wstat.name = (char *) new_dentry->d_name.name; | |
2bad8471 | 810 | |
531b1094 | 811 | retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); |
2bad8471 | 812 | |
2bad8471 | 813 | if (retval < 0) |
531b1094 | 814 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 EVH |
815 | |
816 | kfree(fcall); | |
da977b2c EVH |
817 | |
818 | Clunk_newdir: | |
819 | v9fs_fid_clunk(v9ses, newdirfid); | |
820 | ||
821 | Clunk_olddir: | |
822 | v9fs_fid_clunk(v9ses, olddirfid); | |
823 | ||
824 | Release_lock: | |
825 | up(&oldfid->lock); | |
826 | ||
2bad8471 EVH |
827 | return retval; |
828 | } | |
829 | ||
830 | /** | |
943ffb58 | 831 | * v9fs_vfs_getattr - retrieve file metadata |
2bad8471 EVH |
832 | * @mnt - mount information |
833 | * @dentry - file to get attributes on | |
834 | * @stat - metadata structure to populate | |
835 | * | |
836 | */ | |
837 | ||
838 | static int | |
839 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
840 | struct kstat *stat) | |
841 | { | |
842 | struct v9fs_fcall *fcall = NULL; | |
843 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 844 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 EVH |
845 | int err = -EPERM; |
846 | ||
847 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
da977b2c EVH |
848 | if(IS_ERR(fid)) |
849 | return PTR_ERR(fid); | |
2bad8471 EVH |
850 | |
851 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
852 | ||
853 | if (err < 0) | |
854 | dprintk(DEBUG_ERROR, "stat error\n"); | |
855 | else { | |
531b1094 | 856 | v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, |
2bad8471 EVH |
857 | dentry->d_inode->i_sb); |
858 | generic_fillattr(dentry->d_inode, stat); | |
859 | } | |
860 | ||
861 | kfree(fcall); | |
da977b2c | 862 | v9fs_fid_clunk(v9ses, fid); |
2bad8471 EVH |
863 | return err; |
864 | } | |
865 | ||
866 | /** | |
867 | * v9fs_vfs_setattr - set file metadata | |
868 | * @dentry: file whose metadata to set | |
869 | * @iattr: metadata assignment structure | |
870 | * | |
871 | */ | |
872 | ||
873 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
874 | { | |
875 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 876 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 | 877 | struct v9fs_fcall *fcall = NULL; |
531b1094 | 878 | struct v9fs_wstat wstat; |
2bad8471 EVH |
879 | int res = -EPERM; |
880 | ||
881 | dprintk(DEBUG_VFS, "\n"); | |
da977b2c EVH |
882 | if(IS_ERR(fid)) |
883 | return PTR_ERR(fid); | |
2bad8471 | 884 | |
531b1094 | 885 | v9fs_blank_wstat(&wstat); |
2bad8471 | 886 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 887 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
888 | |
889 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 890 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
891 | |
892 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 893 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
894 | |
895 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 896 | wstat.length = iattr->ia_size; |
2bad8471 EVH |
897 | |
898 | if (v9ses->extended) { | |
531b1094 LI |
899 | if (iattr->ia_valid & ATTR_UID) |
900 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 901 | |
531b1094 LI |
902 | if (iattr->ia_valid & ATTR_GID) |
903 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
904 | } |
905 | ||
531b1094 | 906 | res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); |
2bad8471 EVH |
907 | |
908 | if (res < 0) | |
531b1094 | 909 | PRINT_FCALL_ERROR("wstat error", fcall); |
2bad8471 | 910 | |
2bad8471 | 911 | kfree(fcall); |
2bad8471 EVH |
912 | if (res >= 0) |
913 | res = inode_setattr(dentry->d_inode, iattr); | |
914 | ||
da977b2c | 915 | v9fs_fid_clunk(v9ses, fid); |
2bad8471 EVH |
916 | return res; |
917 | } | |
918 | ||
919 | /** | |
531b1094 LI |
920 | * v9fs_stat2inode - populate an inode structure with mistat info |
921 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
922 | * @inode: inode to populate |
923 | * @sb: superblock of filesystem | |
924 | * | |
925 | */ | |
926 | ||
927 | void | |
531b1094 LI |
928 | v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, |
929 | struct super_block *sb) | |
2bad8471 | 930 | { |
1dac06b2 | 931 | int n; |
531b1094 | 932 | char ext[32]; |
2bad8471 EVH |
933 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
934 | ||
935 | inode->i_nlink = 1; | |
936 | ||
531b1094 LI |
937 | inode->i_atime.tv_sec = stat->atime; |
938 | inode->i_mtime.tv_sec = stat->mtime; | |
939 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 940 | |
531b1094 LI |
941 | inode->i_uid = v9ses->uid; |
942 | inode->i_gid = v9ses->gid; | |
2bad8471 EVH |
943 | |
944 | if (v9ses->extended) { | |
531b1094 LI |
945 | inode->i_uid = stat->n_uid; |
946 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
947 | } |
948 | ||
531b1094 | 949 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
950 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
951 | char type = 0; | |
952 | int major = -1; | |
953 | int minor = -1; | |
531b1094 | 954 | |
1dac06b2 LI |
955 | n = stat->extension.len; |
956 | if (n > sizeof(ext)-1) | |
957 | n = sizeof(ext)-1; | |
958 | memmove(ext, stat->extension.str, n); | |
959 | ext[n] = 0; | |
531b1094 | 960 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
961 | switch (type) { |
962 | case 'c': | |
963 | inode->i_mode &= ~S_IFBLK; | |
964 | inode->i_mode |= S_IFCHR; | |
965 | break; | |
966 | case 'b': | |
967 | break; | |
968 | default: | |
531b1094 LI |
969 | dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", |
970 | type, stat->extension.len, stat->extension.str); | |
2bad8471 EVH |
971 | }; |
972 | inode->i_rdev = MKDEV(major, minor); | |
973 | } else | |
974 | inode->i_rdev = 0; | |
975 | ||
531b1094 | 976 | inode->i_size = stat->length; |
2bad8471 | 977 | |
2bad8471 | 978 | inode->i_blocks = |
ba52de12 | 979 | (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; |
2bad8471 EVH |
980 | } |
981 | ||
982 | /** | |
983 | * v9fs_qid2ino - convert qid into inode number | |
984 | * @qid: qid to hash | |
985 | * | |
986 | * BUG: potential for inode number collisions? | |
987 | */ | |
988 | ||
989 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
990 | { | |
991 | u64 path = qid->path + 2; | |
992 | ino_t i = 0; | |
993 | ||
994 | if (sizeof(ino_t) == sizeof(path)) | |
995 | memcpy(&i, &path, sizeof(ino_t)); | |
996 | else | |
997 | i = (ino_t) (path ^ (path >> 32)); | |
998 | ||
999 | return i; | |
1000 | } | |
1001 | ||
2bad8471 EVH |
1002 | /** |
1003 | * v9fs_readlink - read a symlink's location (internal version) | |
1004 | * @dentry: dentry for symlink | |
73c592b9 | 1005 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1006 | * @buflen: length of buffer |
1007 | * | |
1008 | */ | |
1009 | ||
1010 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1011 | { | |
1012 | int retval = -EPERM; | |
1013 | ||
1014 | struct v9fs_fcall *fcall = NULL; | |
1015 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
da977b2c | 1016 | struct v9fs_fid *fid = v9fs_fid_clone(dentry); |
2bad8471 | 1017 | |
da977b2c EVH |
1018 | if(IS_ERR(fid)) |
1019 | return PTR_ERR(fid); | |
2bad8471 EVH |
1020 | |
1021 | if (!v9ses->extended) { | |
1022 | retval = -EBADF; | |
1023 | dprintk(DEBUG_ERROR, "not extended\n"); | |
da977b2c | 1024 | goto ClunkFid; |
2bad8471 EVH |
1025 | } |
1026 | ||
1027 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1028 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1029 | ||
1030 | if (retval < 0) { | |
1031 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1032 | goto FreeFcall; | |
1033 | } | |
1034 | ||
da977b2c EVH |
1035 | if (!fcall) { |
1036 | retval = -EIO; | |
1037 | goto ClunkFid; | |
1038 | } | |
2bad8471 | 1039 | |
531b1094 | 1040 | if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { |
2bad8471 EVH |
1041 | retval = -EINVAL; |
1042 | goto FreeFcall; | |
1043 | } | |
1044 | ||
1045 | /* copy extension buffer into buffer */ | |
6a3124a3 | 1046 | if (fcall->params.rstat.stat.extension.len < buflen) |
16cce6d2 | 1047 | buflen = fcall->params.rstat.stat.extension.len + 1; |
2bad8471 | 1048 | |
16cce6d2 | 1049 | memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); |
531b1094 | 1050 | buffer[buflen-1] = 0; |
2bad8471 | 1051 | |
16cce6d2 LI |
1052 | dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, |
1053 | fcall->params.rstat.stat.extension.str, buffer); | |
2bad8471 EVH |
1054 | retval = buflen; |
1055 | ||
da977b2c | 1056 | FreeFcall: |
2bad8471 EVH |
1057 | kfree(fcall); |
1058 | ||
da977b2c EVH |
1059 | ClunkFid: |
1060 | v9fs_fid_clunk(v9ses, fid); | |
1061 | ||
2bad8471 EVH |
1062 | return retval; |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * v9fs_vfs_readlink - read a symlink's location | |
1067 | * @dentry: dentry for symlink | |
1068 | * @buf: buffer to load symlink location into | |
1069 | * @buflen: length of buffer | |
1070 | * | |
1071 | */ | |
1072 | ||
1073 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1074 | int buflen) | |
1075 | { | |
1076 | int retval; | |
1077 | int ret; | |
1078 | char *link = __getname(); | |
1079 | ||
0710d36a FM |
1080 | if (unlikely(!link)) |
1081 | return -ENOMEM; | |
1082 | ||
a1f9d8d2 LI |
1083 | if (buflen > PATH_MAX) |
1084 | buflen = PATH_MAX; | |
2bad8471 EVH |
1085 | |
1086 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1087 | ||
1088 | retval = v9fs_readlink(dentry, link, buflen); | |
1089 | ||
1090 | if (retval > 0) { | |
1091 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1092 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1093 | ret); | |
1094 | retval = ret; | |
1095 | } | |
1096 | } | |
1097 | ||
ce44eeb6 | 1098 | __putname(link); |
2bad8471 EVH |
1099 | return retval; |
1100 | } | |
1101 | ||
1102 | /** | |
1103 | * v9fs_vfs_follow_link - follow a symlink path | |
1104 | * @dentry: dentry for symlink | |
1105 | * @nd: nameidata | |
1106 | * | |
1107 | */ | |
1108 | ||
1109 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1110 | { | |
1111 | int len = 0; | |
1112 | char *link = __getname(); | |
1113 | ||
1114 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1115 | ||
1116 | if (!link) | |
1117 | link = ERR_PTR(-ENOMEM); | |
1118 | else { | |
16cce6d2 | 1119 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1120 | |
1121 | if (len < 0) { | |
ce44eeb6 | 1122 | __putname(link); |
2bad8471 EVH |
1123 | link = ERR_PTR(len); |
1124 | } else | |
1125 | link[len] = 0; | |
1126 | } | |
1127 | nd_set_link(nd, link); | |
1128 | ||
1129 | return NULL; | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * v9fs_vfs_put_link - release a symlink path | |
1134 | * @dentry: dentry for symlink | |
1135 | * @nd: nameidata | |
1136 | * | |
1137 | */ | |
1138 | ||
1139 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1140 | { | |
1141 | char *s = nd_get_link(nd); | |
1142 | ||
1143 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1144 | if (!IS_ERR(s)) | |
ce44eeb6 | 1145 | __putname(s); |
2bad8471 EVH |
1146 | } |
1147 | ||
531b1094 LI |
1148 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1149 | int mode, const char *extension) | |
2bad8471 | 1150 | { |
6a3124a3 LI |
1151 | int err; |
1152 | u32 fid, perm; | |
531b1094 | 1153 | struct v9fs_session_info *v9ses; |
da977b2c EVH |
1154 | struct v9fs_fid *dfid, *vfid = NULL; |
1155 | struct inode *inode = NULL; | |
2bad8471 | 1156 | |
6a3124a3 | 1157 | v9ses = v9fs_inode2v9ses(dir); |
2bad8471 EVH |
1158 | if (!v9ses->extended) { |
1159 | dprintk(DEBUG_ERROR, "not extended\n"); | |
6a3124a3 | 1160 | return -EPERM; |
2bad8471 EVH |
1161 | } |
1162 | ||
da977b2c EVH |
1163 | dfid = v9fs_fid_clone(dentry->d_parent); |
1164 | if(IS_ERR(dfid)) { | |
1165 | err = PTR_ERR(dfid); | |
1166 | goto error; | |
1167 | } | |
1168 | ||
1169 | perm = unixmode2p9mode(v9ses, mode); | |
1170 | ||
6a3124a3 | 1171 | err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, |
16cce6d2 | 1172 | perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); |
2bad8471 | 1173 | |
6a3124a3 | 1174 | if (err) |
da977b2c | 1175 | goto clunk_dfid; |
6a3124a3 LI |
1176 | |
1177 | err = v9fs_t_clunk(v9ses, fid); | |
1178 | if (err) | |
da977b2c | 1179 | goto clunk_dfid; |
6a3124a3 LI |
1180 | |
1181 | vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); | |
1182 | if (IS_ERR(vfid)) { | |
1183 | err = PTR_ERR(vfid); | |
1184 | vfid = NULL; | |
da977b2c | 1185 | goto clunk_dfid; |
6a3124a3 LI |
1186 | } |
1187 | ||
1188 | inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); | |
1189 | if (IS_ERR(inode)) { | |
1190 | err = PTR_ERR(inode); | |
1191 | inode = NULL; | |
da977b2c | 1192 | goto free_vfid; |
2bad8471 EVH |
1193 | } |
1194 | ||
e03abc0c EVH |
1195 | if(v9ses->cache) |
1196 | dentry->d_op = &v9fs_cached_dentry_operations; | |
1197 | else | |
1198 | dentry->d_op = &v9fs_dentry_operations; | |
6a3124a3 LI |
1199 | d_instantiate(dentry, inode); |
1200 | return 0; | |
2bad8471 | 1201 | |
da977b2c EVH |
1202 | free_vfid: |
1203 | v9fs_fid_destroy(vfid); | |
1204 | ||
1205 | clunk_dfid: | |
1206 | v9fs_fid_clunk(v9ses, dfid); | |
6a3124a3 | 1207 | |
da977b2c | 1208 | error: |
6a3124a3 LI |
1209 | return err; |
1210 | ||
531b1094 LI |
1211 | } |
1212 | ||
1213 | /** | |
1214 | * v9fs_vfs_symlink - helper function to create symlinks | |
1215 | * @dir: directory inode containing symlink | |
1216 | * @dentry: dentry for symlink | |
1217 | * @symname: symlink data | |
1218 | * | |
1219 | * See 9P2000.u RFC for more information | |
1220 | * | |
1221 | */ | |
1222 | ||
1223 | static int | |
1224 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1225 | { | |
1226 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1227 | symname); | |
1228 | ||
1229 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * v9fs_vfs_link - create a hardlink | |
1234 | * @old_dentry: dentry for file to link to | |
1235 | * @dir: inode destination for new link | |
1236 | * @dentry: dentry for link | |
1237 | * | |
1238 | */ | |
1239 | ||
1240 | /* XXX - lots of code dup'd from symlink and creates, | |
1241 | * figure out a better reuse strategy | |
1242 | */ | |
1243 | ||
1244 | static int | |
1245 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1246 | struct dentry *dentry) | |
1247 | { | |
1248 | int retval; | |
da977b2c | 1249 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
531b1094 LI |
1250 | struct v9fs_fid *oldfid; |
1251 | char *name; | |
1252 | ||
1253 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1254 | old_dentry->d_name.name); | |
1255 | ||
da977b2c EVH |
1256 | oldfid = v9fs_fid_clone(old_dentry); |
1257 | if(IS_ERR(oldfid)) | |
1258 | return PTR_ERR(oldfid); | |
531b1094 LI |
1259 | |
1260 | name = __getname(); | |
da977b2c EVH |
1261 | if (unlikely(!name)) { |
1262 | retval = -ENOMEM; | |
1263 | goto clunk_fid; | |
1264 | } | |
0710d36a | 1265 | |
16cce6d2 | 1266 | sprintf(name, "%d\n", oldfid->fid); |
531b1094 LI |
1267 | retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); |
1268 | __putname(name); | |
2bad8471 | 1269 | |
da977b2c EVH |
1270 | clunk_fid: |
1271 | v9fs_fid_clunk(v9ses, oldfid); | |
2bad8471 EVH |
1272 | return retval; |
1273 | } | |
1274 | ||
1275 | /** | |
1276 | * v9fs_vfs_mknod - create a special file | |
1277 | * @dir: inode destination for new link | |
1278 | * @dentry: dentry for file | |
1279 | * @mode: mode for creation | |
1280 | * @dev_t: device associated with special file | |
1281 | * | |
1282 | */ | |
1283 | ||
1284 | static int | |
1285 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1286 | { | |
531b1094 LI |
1287 | int retval; |
1288 | char *name; | |
2bad8471 EVH |
1289 | |
1290 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1291 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1292 | ||
531b1094 LI |
1293 | if (!new_valid_dev(rdev)) |
1294 | return -EINVAL; | |
2bad8471 | 1295 | |
531b1094 | 1296 | name = __getname(); |
c0291a05 ET |
1297 | if (!name) |
1298 | return -ENOMEM; | |
2bad8471 EVH |
1299 | /* build extension */ |
1300 | if (S_ISBLK(mode)) | |
531b1094 | 1301 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1302 | else if (S_ISCHR(mode)) |
531b1094 | 1303 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1304 | else if (S_ISFIFO(mode)) |
531b1094 | 1305 | *name = 0; |
2bad8471 | 1306 | else { |
531b1094 LI |
1307 | __putname(name); |
1308 | return -EINVAL; | |
2bad8471 EVH |
1309 | } |
1310 | ||
531b1094 LI |
1311 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1312 | __putname(name); | |
2bad8471 EVH |
1313 | |
1314 | return retval; | |
1315 | } | |
1316 | ||
754661f1 | 1317 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1318 | .create = v9fs_vfs_create, |
1319 | .lookup = v9fs_vfs_lookup, | |
1320 | .symlink = v9fs_vfs_symlink, | |
1321 | .link = v9fs_vfs_link, | |
1322 | .unlink = v9fs_vfs_unlink, | |
1323 | .mkdir = v9fs_vfs_mkdir, | |
1324 | .rmdir = v9fs_vfs_rmdir, | |
1325 | .mknod = v9fs_vfs_mknod, | |
1326 | .rename = v9fs_vfs_rename, | |
1327 | .readlink = v9fs_vfs_readlink, | |
1328 | .getattr = v9fs_vfs_getattr, | |
1329 | .setattr = v9fs_vfs_setattr, | |
1330 | }; | |
1331 | ||
754661f1 | 1332 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1333 | .create = v9fs_vfs_create, |
1334 | .lookup = v9fs_vfs_lookup, | |
1335 | .unlink = v9fs_vfs_unlink, | |
1336 | .mkdir = v9fs_vfs_mkdir, | |
1337 | .rmdir = v9fs_vfs_rmdir, | |
1338 | .mknod = v9fs_vfs_mknod, | |
1339 | .rename = v9fs_vfs_rename, | |
1340 | .getattr = v9fs_vfs_getattr, | |
1341 | .setattr = v9fs_vfs_setattr, | |
1342 | }; | |
1343 | ||
754661f1 | 1344 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1345 | .getattr = v9fs_vfs_getattr, |
1346 | .setattr = v9fs_vfs_setattr, | |
1347 | }; | |
1348 | ||
754661f1 | 1349 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1350 | .readlink = v9fs_vfs_readlink, |
1351 | .follow_link = v9fs_vfs_follow_link, | |
1352 | .put_link = v9fs_vfs_put_link, | |
1353 | .getattr = v9fs_vfs_getattr, | |
1354 | .setattr = v9fs_vfs_setattr, | |
1355 | }; |