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> | |
2bad8471 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/namei.h> | |
35 | #include <linux/idr.h> | |
e8edc6e0 | 36 | #include <linux/sched.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
bd238fb4 LI |
38 | #include <net/9p/9p.h> |
39 | #include <net/9p/client.h> | |
2bad8471 | 40 | |
2bad8471 | 41 | #include "v9fs.h" |
2bad8471 | 42 | #include "v9fs_vfs.h" |
2bad8471 | 43 | #include "fid.h" |
60e78d2c | 44 | #include "cache.h" |
2bad8471 | 45 | |
754661f1 AV |
46 | static const struct inode_operations v9fs_dir_inode_operations; |
47 | static const struct inode_operations v9fs_dir_inode_operations_ext; | |
48 | static const struct inode_operations v9fs_file_inode_operations; | |
49 | static const struct inode_operations v9fs_symlink_inode_operations; | |
2bad8471 EVH |
50 | |
51 | /** | |
52 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
53 | * @v9ses: v9fs session information | |
54 | * @mode: mode to convert | |
55 | * | |
56 | */ | |
57 | ||
73c592b9 | 58 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
59 | { |
60 | int res; | |
61 | res = mode & 0777; | |
62 | if (S_ISDIR(mode)) | |
bd238fb4 | 63 | res |= P9_DMDIR; |
dd6102fb | 64 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 65 | if (S_ISLNK(mode)) |
bd238fb4 | 66 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
67 | if (v9ses->nodev == 0) { |
68 | if (S_ISSOCK(mode)) | |
bd238fb4 | 69 | res |= P9_DMSOCKET; |
2bad8471 | 70 | if (S_ISFIFO(mode)) |
bd238fb4 | 71 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 72 | if (S_ISBLK(mode)) |
bd238fb4 | 73 | res |= P9_DMDEVICE; |
2bad8471 | 74 | if (S_ISCHR(mode)) |
bd238fb4 | 75 | res |= P9_DMDEVICE; |
2bad8471 EVH |
76 | } |
77 | ||
78 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 79 | res |= P9_DMSETUID; |
2bad8471 | 80 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 81 | res |= P9_DMSETGID; |
d199d652 AL |
82 | if ((mode & S_ISVTX) == S_ISVTX) |
83 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
84 | if ((mode & P9_DMLINK)) |
85 | res |= P9_DMLINK; | |
2bad8471 EVH |
86 | } |
87 | ||
88 | return res; | |
89 | } | |
90 | ||
91 | /** | |
92 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
93 | * @v9ses: v9fs session information | |
94 | * @mode: mode to convert | |
95 | * | |
96 | */ | |
97 | ||
73c592b9 | 98 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
99 | { |
100 | int res; | |
101 | ||
102 | res = mode & 0777; | |
103 | ||
bd238fb4 | 104 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 105 | res |= S_IFDIR; |
dd6102fb | 106 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 107 | res |= S_IFLNK; |
dd6102fb | 108 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
109 | && (v9ses->nodev == 0)) |
110 | res |= S_IFSOCK; | |
dd6102fb | 111 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
112 | && (v9ses->nodev == 0)) |
113 | res |= S_IFIFO; | |
dd6102fb | 114 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
115 | && (v9ses->nodev == 0)) |
116 | res |= S_IFBLK; | |
117 | else | |
118 | res |= S_IFREG; | |
119 | ||
dd6102fb | 120 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 121 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
122 | res |= S_ISUID; |
123 | ||
bd238fb4 | 124 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 125 | res |= S_ISGID; |
d199d652 AL |
126 | |
127 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
128 | res |= S_ISVTX; | |
2bad8471 EVH |
129 | } |
130 | ||
131 | return res; | |
132 | } | |
133 | ||
ee443996 EVH |
134 | /** |
135 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
136 | * @uflags: flags to convert | |
2e4bef41 | 137 | * @extended: if .u extensions are active |
ee443996 EVH |
138 | */ |
139 | ||
2e4bef41 | 140 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
141 | { |
142 | int ret; | |
143 | ||
144 | ret = 0; | |
145 | switch (uflags&3) { | |
146 | default: | |
147 | case O_RDONLY: | |
bd238fb4 | 148 | ret = P9_OREAD; |
6a3124a3 LI |
149 | break; |
150 | ||
151 | case O_WRONLY: | |
bd238fb4 | 152 | ret = P9_OWRITE; |
6a3124a3 LI |
153 | break; |
154 | ||
155 | case O_RDWR: | |
bd238fb4 | 156 | ret = P9_ORDWR; |
6a3124a3 LI |
157 | break; |
158 | } | |
159 | ||
6a3124a3 | 160 | if (uflags & O_TRUNC) |
bd238fb4 | 161 | ret |= P9_OTRUNC; |
6a3124a3 | 162 | |
2e4bef41 EVH |
163 | if (extended) { |
164 | if (uflags & O_EXCL) | |
165 | ret |= P9_OEXCL; | |
166 | ||
167 | if (uflags & O_APPEND) | |
168 | ret |= P9_OAPPEND; | |
169 | } | |
6a3124a3 LI |
170 | |
171 | return ret; | |
172 | } | |
173 | ||
2bad8471 | 174 | /** |
531b1094 | 175 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 176 | * @wstat: structure to initialize |
2bad8471 EVH |
177 | * |
178 | */ | |
179 | ||
7a4439c4 | 180 | void |
bd238fb4 | 181 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 182 | { |
531b1094 LI |
183 | wstat->type = ~0; |
184 | wstat->dev = ~0; | |
185 | wstat->qid.type = ~0; | |
186 | wstat->qid.version = ~0; | |
187 | *((long long *)&wstat->qid.path) = ~0; | |
188 | wstat->mode = ~0; | |
189 | wstat->atime = ~0; | |
190 | wstat->mtime = ~0; | |
191 | wstat->length = ~0; | |
192 | wstat->name = NULL; | |
193 | wstat->uid = NULL; | |
194 | wstat->gid = NULL; | |
195 | wstat->muid = NULL; | |
196 | wstat->n_uid = ~0; | |
197 | wstat->n_gid = ~0; | |
198 | wstat->n_muid = ~0; | |
199 | wstat->extension = NULL; | |
2bad8471 EVH |
200 | } |
201 | ||
60e78d2c AK |
202 | #ifdef CONFIG_9P_FSCACHE |
203 | /** | |
204 | * v9fs_alloc_inode - helper function to allocate an inode | |
205 | * This callback is executed before setting up the inode so that we | |
206 | * can associate a vcookie with each inode. | |
207 | * | |
208 | */ | |
209 | ||
210 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
211 | { | |
212 | struct v9fs_cookie *vcookie; | |
213 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
214 | GFP_KERNEL); | |
215 | if (!vcookie) | |
216 | return NULL; | |
217 | ||
218 | vcookie->fscache = NULL; | |
219 | vcookie->qid = NULL; | |
220 | spin_lock_init(&vcookie->lock); | |
221 | return &vcookie->inode; | |
222 | } | |
223 | ||
224 | /** | |
225 | * v9fs_destroy_inode - destroy an inode | |
226 | * | |
227 | */ | |
228 | ||
229 | void v9fs_destroy_inode(struct inode *inode) | |
230 | { | |
231 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); | |
232 | } | |
233 | #endif | |
234 | ||
2bad8471 EVH |
235 | /** |
236 | * v9fs_get_inode - helper function to setup an inode | |
237 | * @sb: superblock | |
238 | * @mode: mode to setup inode with | |
239 | * | |
240 | */ | |
241 | ||
242 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
243 | { | |
2bb54115 | 244 | int err; |
6a3124a3 | 245 | struct inode *inode; |
b501611a | 246 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 247 | |
bd238fb4 | 248 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
249 | |
250 | inode = new_inode(sb); | |
2bb54115 AK |
251 | if (!inode) { |
252 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 253 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
254 | } |
255 | ||
256 | inode->i_mode = mode; | |
257 | inode->i_uid = current_fsuid(); | |
258 | inode->i_gid = current_fsgid(); | |
259 | inode->i_blocks = 0; | |
260 | inode->i_rdev = 0; | |
261 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
262 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
263 | ||
264 | switch (mode & S_IFMT) { | |
265 | case S_IFIFO: | |
266 | case S_IFBLK: | |
267 | case S_IFCHR: | |
268 | case S_IFSOCK: | |
dd6102fb | 269 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 270 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
271 | "special files without extended mode\n"); |
272 | err = -EINVAL; | |
273 | goto error; | |
2bad8471 | 274 | } |
2bb54115 AK |
275 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
276 | break; | |
277 | case S_IFREG: | |
278 | inode->i_op = &v9fs_file_inode_operations; | |
279 | inode->i_fop = &v9fs_file_operations; | |
280 | break; | |
281 | case S_IFLNK: | |
dd6102fb | 282 | if (!v9fs_proto_dotu(v9ses)) { |
2bb54115 AK |
283 | P9_DPRINTK(P9_DEBUG_ERROR, |
284 | "extended modes used w/o 9P2000.u\n"); | |
285 | err = -EINVAL; | |
286 | goto error; | |
287 | } | |
288 | inode->i_op = &v9fs_symlink_inode_operations; | |
289 | break; | |
290 | case S_IFDIR: | |
291 | inc_nlink(inode); | |
dd6102fb | 292 | if (v9fs_proto_dotu(v9ses)) |
2bb54115 AK |
293 | inode->i_op = &v9fs_dir_inode_operations_ext; |
294 | else | |
295 | inode->i_op = &v9fs_dir_inode_operations; | |
296 | inode->i_fop = &v9fs_dir_operations; | |
297 | break; | |
298 | default: | |
299 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
300 | mode, mode & S_IFMT); | |
301 | err = -EINVAL; | |
302 | goto error; | |
2bad8471 | 303 | } |
2bb54115 | 304 | |
2bad8471 | 305 | return inode; |
2bb54115 AK |
306 | |
307 | error: | |
308 | iput(inode); | |
309 | return ERR_PTR(err); | |
2bad8471 EVH |
310 | } |
311 | ||
bd238fb4 | 312 | /* |
6a3124a3 LI |
313 | static struct v9fs_fid* |
314 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
315 | { | |
316 | int err; | |
736c4b85 | 317 | int nfid; |
6a3124a3 LI |
318 | struct v9fs_fid *ret; |
319 | struct v9fs_fcall *fcall; | |
320 | ||
321 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
322 | if (nfid < 0) { | |
0b8dd177 | 323 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 324 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
325 | } |
326 | ||
6a3124a3 LI |
327 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
328 | &fcall); | |
329 | ||
330 | if (err < 0) { | |
41e5a6ac LI |
331 | if (fcall && fcall->id == RWALK) |
332 | goto clunk_fid; | |
333 | ||
6a3124a3 LI |
334 | PRINT_FCALL_ERROR("walk error", fcall); |
335 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
336 | goto error; | |
0b8dd177 | 337 | } |
6a3124a3 | 338 | |
3cf6429a LI |
339 | kfree(fcall); |
340 | fcall = NULL; | |
6a3124a3 LI |
341 | ret = v9fs_fid_create(v9ses, nfid); |
342 | if (!ret) { | |
343 | err = -ENOMEM; | |
344 | goto clunk_fid; | |
345 | } | |
0b8dd177 | 346 | |
6a3124a3 LI |
347 | err = v9fs_fid_insert(ret, dentry); |
348 | if (err < 0) { | |
349 | v9fs_fid_destroy(ret); | |
350 | goto clunk_fid; | |
0b8dd177 | 351 | } |
2bad8471 | 352 | |
6a3124a3 | 353 | return ret; |
2bad8471 | 354 | |
6a3124a3 LI |
355 | clunk_fid: |
356 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 357 | |
6a3124a3 LI |
358 | error: |
359 | kfree(fcall); | |
360 | return ERR_PTR(err); | |
361 | } | |
bd238fb4 | 362 | */ |
2bad8471 | 363 | |
60e78d2c AK |
364 | |
365 | /** | |
366 | * v9fs_clear_inode - release an inode | |
367 | * @inode: inode to release | |
368 | * | |
369 | */ | |
370 | void v9fs_clear_inode(struct inode *inode) | |
371 | { | |
372 | filemap_fdatawrite(inode->i_mapping); | |
373 | ||
374 | #ifdef CONFIG_9P_FSCACHE | |
375 | v9fs_cache_inode_put_cookie(inode); | |
376 | #endif | |
377 | } | |
378 | ||
ee443996 EVH |
379 | /** |
380 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
381 | * @v9ses: session information | |
382 | * @fid: fid to issue attribute request for | |
383 | * @sb: superblock on which to create inode | |
384 | * | |
385 | */ | |
386 | ||
5174fdab | 387 | static struct inode * |
bd238fb4 | 388 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
389 | struct super_block *sb) |
390 | { | |
391 | int err, umode; | |
392 | struct inode *ret; | |
51a87c55 | 393 | struct p9_wstat *st; |
531b1094 | 394 | |
6a3124a3 | 395 | ret = NULL; |
bd238fb4 | 396 | st = p9_client_stat(fid); |
02bc3567 AK |
397 | if (IS_ERR(st)) |
398 | return ERR_CAST(st); | |
2bad8471 | 399 | |
bd238fb4 | 400 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
401 | ret = v9fs_get_inode(sb, umode); |
402 | if (IS_ERR(ret)) { | |
403 | err = PTR_ERR(ret); | |
6a3124a3 LI |
404 | goto error; |
405 | } | |
2bad8471 | 406 | |
bd238fb4 LI |
407 | v9fs_stat2inode(st, ret, sb); |
408 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
409 | |
410 | #ifdef CONFIG_9P_FSCACHE | |
411 | v9fs_vcookie_set_qid(ret, &st->qid); | |
412 | v9fs_cache_inode_get_cookie(ret); | |
413 | #endif | |
02bc3567 | 414 | p9stat_free(st); |
bd238fb4 | 415 | kfree(st); |
60e78d2c | 416 | |
6a3124a3 | 417 | return ret; |
2bad8471 | 418 | |
6a3124a3 | 419 | error: |
02bc3567 | 420 | p9stat_free(st); |
bd238fb4 | 421 | kfree(st); |
6a3124a3 | 422 | return ERR_PTR(err); |
2bad8471 EVH |
423 | } |
424 | ||
425 | /** | |
426 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
427 | * @dir: directory inode that is being deleted |
428 | * @file: dentry that is being deleted | |
429 | * @rmdir: removing a directory | |
2bad8471 EVH |
430 | * |
431 | */ | |
432 | ||
433 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
434 | { | |
d994f405 | 435 | int retval; |
bd238fb4 LI |
436 | struct inode *file_inode; |
437 | struct v9fs_session_info *v9ses; | |
438 | struct p9_fid *v9fid; | |
2bad8471 | 439 | |
bd238fb4 | 440 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
441 | rmdir); |
442 | ||
443 | file_inode = file->d_inode; | |
2bad8471 | 444 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 445 | v9fid = v9fs_fid_clone(file); |
ba17674f | 446 | if (IS_ERR(v9fid)) |
da977b2c | 447 | return PTR_ERR(v9fid); |
2bad8471 | 448 | |
d994f405 AK |
449 | retval = p9_client_remove(v9fid); |
450 | if (!retval) | |
451 | drop_nlink(file_inode); | |
452 | return retval; | |
2bad8471 EVH |
453 | } |
454 | ||
6a3124a3 LI |
455 | static int |
456 | v9fs_open_created(struct inode *inode, struct file *file) | |
457 | { | |
458 | return 0; | |
459 | } | |
460 | ||
bd238fb4 | 461 | |
2bad8471 | 462 | /** |
bd238fb4 | 463 | * v9fs_create - Create a file |
ee443996 EVH |
464 | * @v9ses: session information |
465 | * @dir: directory that dentry is being created in | |
bd238fb4 | 466 | * @dentry: dentry that is being created |
0e15597e | 467 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
468 | * @perm: create permissions |
469 | * @mode: open mode | |
2bad8471 EVH |
470 | * |
471 | */ | |
bd238fb4 LI |
472 | static struct p9_fid * |
473 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
474 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 475 | { |
6a3124a3 | 476 | int err; |
bd238fb4 LI |
477 | char *name; |
478 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 479 | struct inode *inode; |
6a3124a3 | 480 | |
51a87c55 EVH |
481 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
482 | ||
bd238fb4 LI |
483 | err = 0; |
484 | ofid = NULL; | |
485 | fid = NULL; | |
486 | name = (char *) dentry->d_name.name; | |
da977b2c | 487 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 488 | if (IS_ERR(dfid)) { |
da977b2c | 489 | err = PTR_ERR(dfid); |
51a87c55 | 490 | P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); |
bd238fb4 | 491 | dfid = NULL; |
da977b2c EVH |
492 | goto error; |
493 | } | |
6a3124a3 | 494 | |
bd238fb4 LI |
495 | /* clone a fid to use for creation */ |
496 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
497 | if (IS_ERR(ofid)) { | |
498 | err = PTR_ERR(ofid); | |
51a87c55 | 499 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 LI |
500 | ofid = NULL; |
501 | goto error; | |
502 | } | |
6a3124a3 | 503 | |
bd238fb4 | 504 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
505 | if (err < 0) { |
506 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 507 | goto error; |
51a87c55 | 508 | } |
6a3124a3 | 509 | |
bd238fb4 LI |
510 | /* now walk from the parent so we can get unopened fid */ |
511 | fid = p9_client_walk(dfid, 1, &name, 0); | |
512 | if (IS_ERR(fid)) { | |
513 | err = PTR_ERR(fid); | |
51a87c55 | 514 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 515 | fid = NULL; |
6a3124a3 | 516 | goto error; |
bd238fb4 LI |
517 | } else |
518 | dfid = NULL; | |
6a3124a3 | 519 | |
bd238fb4 LI |
520 | /* instantiate inode and assign the unopened fid to the dentry */ |
521 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
522 | if (IS_ERR(inode)) { |
523 | err = PTR_ERR(inode); | |
51a87c55 | 524 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
525 | goto error; |
526 | } | |
527 | ||
ba17674f | 528 | if (v9ses->cache) |
e03abc0c EVH |
529 | dentry->d_op = &v9fs_cached_dentry_operations; |
530 | else | |
531 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 532 | |
6a3124a3 | 533 | d_instantiate(dentry, inode); |
50fb6d2b AK |
534 | err = v9fs_fid_add(dentry, fid); |
535 | if (err < 0) | |
536 | goto error; | |
537 | ||
bd238fb4 | 538 | return ofid; |
6a3124a3 | 539 | |
bd238fb4 LI |
540 | error: |
541 | if (dfid) | |
542 | p9_client_clunk(dfid); | |
543 | ||
544 | if (ofid) | |
545 | p9_client_clunk(ofid); | |
546 | ||
547 | if (fid) | |
548 | p9_client_clunk(fid); | |
549 | ||
550 | return ERR_PTR(err); | |
551 | } | |
552 | ||
553 | /** | |
554 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 555 | * @dir: directory inode that is being created |
bd238fb4 LI |
556 | * @dentry: dentry that is being deleted |
557 | * @mode: create permissions | |
558 | * @nd: path information | |
559 | * | |
560 | */ | |
6a3124a3 | 561 | |
bd238fb4 LI |
562 | static int |
563 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
564 | struct nameidata *nd) | |
565 | { | |
566 | int err; | |
567 | u32 perm; | |
568 | int flags; | |
569 | struct v9fs_session_info *v9ses; | |
570 | struct p9_fid *fid; | |
571 | struct file *filp; | |
572 | ||
573 | err = 0; | |
574 | fid = NULL; | |
575 | v9ses = v9fs_inode2v9ses(dir); | |
576 | perm = unixmode2p9mode(v9ses, mode); | |
577 | if (nd && nd->flags & LOOKUP_OPEN) | |
578 | flags = nd->intent.open.flags - 1; | |
579 | else | |
580 | flags = O_RDWR; | |
581 | ||
582 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
583 | v9fs_uflags2omode(flags, |
584 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
585 | if (IS_ERR(fid)) { |
586 | err = PTR_ERR(fid); | |
587 | fid = NULL; | |
588 | goto error; | |
589 | } | |
590 | ||
591 | /* if we are opening a file, assign the open fid to the file */ | |
592 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
593 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
594 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
595 | err = PTR_ERR(filp); |
596 | goto error; | |
6a3124a3 LI |
597 | } |
598 | ||
bd238fb4 LI |
599 | filp->private_data = fid; |
600 | } else | |
601 | p9_client_clunk(fid); | |
6a3124a3 LI |
602 | |
603 | return 0; | |
604 | ||
605 | error: | |
bd238fb4 LI |
606 | if (fid) |
607 | p9_client_clunk(fid); | |
6a3124a3 | 608 | |
6a3124a3 | 609 | return err; |
2bad8471 EVH |
610 | } |
611 | ||
612 | /** | |
613 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 614 | * @dir: inode that is being unlinked |
2bad8471 EVH |
615 | * @dentry: dentry that is being unlinked |
616 | * @mode: mode for new directory | |
617 | * | |
618 | */ | |
619 | ||
6a3124a3 | 620 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 621 | { |
6a3124a3 | 622 | int err; |
bd238fb4 | 623 | u32 perm; |
6a3124a3 | 624 | struct v9fs_session_info *v9ses; |
bd238fb4 | 625 | struct p9_fid *fid; |
6a3124a3 | 626 | |
bd238fb4 LI |
627 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
628 | err = 0; | |
6a3124a3 | 629 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 630 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
631 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
632 | if (IS_ERR(fid)) { | |
633 | err = PTR_ERR(fid); | |
634 | fid = NULL; | |
6a3124a3 LI |
635 | } |
636 | ||
bd238fb4 LI |
637 | if (fid) |
638 | p9_client_clunk(fid); | |
6a3124a3 | 639 | |
6a3124a3 | 640 | return err; |
2bad8471 EVH |
641 | } |
642 | ||
643 | /** | |
644 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
645 | * @dir: inode that is being walked from | |
646 | * @dentry: dentry that is being walked to? | |
647 | * @nameidata: path data | |
648 | * | |
649 | */ | |
650 | ||
651 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
652 | struct nameidata *nameidata) | |
653 | { | |
654 | struct super_block *sb; | |
655 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 656 | struct p9_fid *dfid, *fid; |
2bad8471 | 657 | struct inode *inode; |
bd238fb4 | 658 | char *name; |
2bad8471 EVH |
659 | int result = 0; |
660 | ||
bd238fb4 | 661 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 662 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 663 | |
11e9b49b SK |
664 | if (dentry->d_name.len > NAME_MAX) |
665 | return ERR_PTR(-ENAMETOOLONG); | |
666 | ||
2bad8471 EVH |
667 | sb = dir->i_sb; |
668 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
669 | dfid = v9fs_fid_lookup(dentry->d_parent); |
670 | if (IS_ERR(dfid)) | |
e231c2ee | 671 | return ERR_CAST(dfid); |
bd238fb4 LI |
672 | |
673 | name = (char *) dentry->d_name.name; | |
674 | fid = p9_client_walk(dfid, 1, &name, 1); | |
675 | if (IS_ERR(fid)) { | |
676 | result = PTR_ERR(fid); | |
2bad8471 EVH |
677 | if (result == -ENOENT) { |
678 | d_add(dentry, NULL); | |
2bad8471 EVH |
679 | return NULL; |
680 | } | |
2bad8471 | 681 | |
bd238fb4 | 682 | return ERR_PTR(result); |
2bad8471 EVH |
683 | } |
684 | ||
bd238fb4 LI |
685 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
686 | if (IS_ERR(inode)) { | |
687 | result = PTR_ERR(inode); | |
688 | inode = NULL; | |
689 | goto error; | |
2bad8471 EVH |
690 | } |
691 | ||
bd238fb4 | 692 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 693 | if (result < 0) |
bd238fb4 | 694 | goto error; |
6a3124a3 | 695 | |
ba17674f | 696 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
697 | dentry->d_op = &v9fs_cached_dentry_operations; |
698 | else | |
699 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
700 | |
701 | d_add(dentry, inode); | |
2bad8471 EVH |
702 | return NULL; |
703 | ||
bd238fb4 | 704 | error: |
62aa528e | 705 | p9_client_clunk(fid); |
da977b2c | 706 | |
2bad8471 EVH |
707 | return ERR_PTR(result); |
708 | } | |
709 | ||
710 | /** | |
711 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
712 | * @i: inode that is being unlinked | |
73c592b9 | 713 | * @d: dentry that is being unlinked |
2bad8471 EVH |
714 | * |
715 | */ | |
716 | ||
717 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
718 | { | |
719 | return v9fs_remove(i, d, 0); | |
720 | } | |
721 | ||
722 | /** | |
723 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
724 | * @i: inode that is being unlinked | |
73c592b9 | 725 | * @d: dentry that is being unlinked |
2bad8471 EVH |
726 | * |
727 | */ | |
728 | ||
729 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
730 | { | |
731 | return v9fs_remove(i, d, 1); | |
732 | } | |
733 | ||
734 | /** | |
735 | * v9fs_vfs_rename - VFS hook to rename an inode | |
736 | * @old_dir: old dir inode | |
737 | * @old_dentry: old dentry | |
738 | * @new_dir: new dir inode | |
739 | * @new_dentry: new dentry | |
740 | * | |
741 | */ | |
742 | ||
743 | static int | |
744 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
745 | struct inode *new_dir, struct dentry *new_dentry) | |
746 | { | |
bd238fb4 LI |
747 | struct inode *old_inode; |
748 | struct v9fs_session_info *v9ses; | |
749 | struct p9_fid *oldfid; | |
750 | struct p9_fid *olddirfid; | |
751 | struct p9_fid *newdirfid; | |
752 | struct p9_wstat wstat; | |
753 | int retval; | |
2bad8471 | 754 | |
bd238fb4 LI |
755 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
756 | retval = 0; | |
757 | old_inode = old_dentry->d_inode; | |
758 | v9ses = v9fs_inode2v9ses(old_inode); | |
759 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 760 | if (IS_ERR(oldfid)) |
da977b2c EVH |
761 | return PTR_ERR(oldfid); |
762 | ||
763 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 764 | if (IS_ERR(olddirfid)) { |
da977b2c | 765 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 766 | goto done; |
da977b2c EVH |
767 | } |
768 | ||
769 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 770 | if (IS_ERR(newdirfid)) { |
da977b2c | 771 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 772 | goto clunk_olddir; |
2bad8471 EVH |
773 | } |
774 | ||
775 | /* 9P can only handle file rename in the same directory */ | |
776 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
777 | P9_DPRINTK(P9_DEBUG_ERROR, |
778 | "old dir and new dir are different\n"); | |
621997cd | 779 | retval = -EXDEV; |
bd238fb4 | 780 | goto clunk_newdir; |
2bad8471 EVH |
781 | } |
782 | ||
531b1094 | 783 | v9fs_blank_wstat(&wstat); |
ba17674f | 784 | wstat.muid = v9ses->uname; |
531b1094 | 785 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 786 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 787 | |
bd238fb4 | 788 | clunk_newdir: |
22150c4f | 789 | p9_client_clunk(newdirfid); |
2bad8471 | 790 | |
bd238fb4 | 791 | clunk_olddir: |
22150c4f | 792 | p9_client_clunk(olddirfid); |
da977b2c | 793 | |
bd238fb4 | 794 | done: |
2bad8471 EVH |
795 | return retval; |
796 | } | |
797 | ||
798 | /** | |
943ffb58 | 799 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
800 | * @mnt: mount information |
801 | * @dentry: file to get attributes on | |
802 | * @stat: metadata structure to populate | |
2bad8471 EVH |
803 | * |
804 | */ | |
805 | ||
806 | static int | |
807 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
808 | struct kstat *stat) | |
809 | { | |
bd238fb4 LI |
810 | int err; |
811 | struct v9fs_session_info *v9ses; | |
812 | struct p9_fid *fid; | |
51a87c55 | 813 | struct p9_wstat *st; |
bd238fb4 LI |
814 | |
815 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
816 | err = -EPERM; | |
817 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 818 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
819 | return simple_getattr(mnt, dentry, stat); |
820 | ||
bd238fb4 LI |
821 | fid = v9fs_fid_lookup(dentry); |
822 | if (IS_ERR(fid)) | |
da977b2c | 823 | return PTR_ERR(fid); |
2bad8471 | 824 | |
bd238fb4 LI |
825 | st = p9_client_stat(fid); |
826 | if (IS_ERR(st)) | |
827 | return PTR_ERR(st); | |
2bad8471 | 828 | |
bd238fb4 | 829 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 830 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 831 | |
bd238fb4 LI |
832 | kfree(st); |
833 | return 0; | |
2bad8471 EVH |
834 | } |
835 | ||
836 | /** | |
837 | * v9fs_vfs_setattr - set file metadata | |
838 | * @dentry: file whose metadata to set | |
839 | * @iattr: metadata assignment structure | |
840 | * | |
841 | */ | |
842 | ||
843 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
844 | { | |
bd238fb4 LI |
845 | int retval; |
846 | struct v9fs_session_info *v9ses; | |
847 | struct p9_fid *fid; | |
848 | struct p9_wstat wstat; | |
2bad8471 | 849 | |
bd238fb4 LI |
850 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
851 | retval = -EPERM; | |
852 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
853 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
854 | if(IS_ERR(fid)) |
855 | return PTR_ERR(fid); | |
2bad8471 | 856 | |
531b1094 | 857 | v9fs_blank_wstat(&wstat); |
2bad8471 | 858 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 859 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
860 | |
861 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 862 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
863 | |
864 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 865 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
866 | |
867 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 868 | wstat.length = iattr->ia_size; |
2bad8471 | 869 | |
dd6102fb | 870 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
871 | if (iattr->ia_valid & ATTR_UID) |
872 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 873 | |
531b1094 LI |
874 | if (iattr->ia_valid & ATTR_GID) |
875 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
876 | } |
877 | ||
bd238fb4 LI |
878 | retval = p9_client_wstat(fid, &wstat); |
879 | if (retval >= 0) | |
880 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 881 | |
bd238fb4 | 882 | return retval; |
2bad8471 EVH |
883 | } |
884 | ||
885 | /** | |
531b1094 LI |
886 | * v9fs_stat2inode - populate an inode structure with mistat info |
887 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
888 | * @inode: inode to populate |
889 | * @sb: superblock of filesystem | |
890 | * | |
891 | */ | |
892 | ||
893 | void | |
51a87c55 | 894 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 895 | struct super_block *sb) |
2bad8471 | 896 | { |
531b1094 | 897 | char ext[32]; |
5717144a AK |
898 | char tag_name[14]; |
899 | unsigned int i_nlink; | |
2bad8471 EVH |
900 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
901 | ||
902 | inode->i_nlink = 1; | |
903 | ||
531b1094 LI |
904 | inode->i_atime.tv_sec = stat->atime; |
905 | inode->i_mtime.tv_sec = stat->mtime; | |
906 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 907 | |
bd32b82d LI |
908 | inode->i_uid = v9ses->dfltuid; |
909 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 910 | |
dd6102fb | 911 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
912 | inode->i_uid = stat->n_uid; |
913 | inode->i_gid = stat->n_gid; | |
2bad8471 | 914 | } |
5717144a AK |
915 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
916 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
917 | /* | |
918 | * Hadlink support got added later to | |
919 | * to the .u extension. So there can be | |
920 | * server out there that doesn't support | |
921 | * this even with .u extension. So check | |
922 | * for non NULL stat->extension | |
923 | */ | |
924 | strncpy(ext, stat->extension, sizeof(ext)); | |
925 | /* HARDLINKCOUNT %u */ | |
926 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
927 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
928 | inode->i_nlink = i_nlink; | |
929 | } | |
930 | } | |
531b1094 | 931 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
932 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
933 | char type = 0; | |
934 | int major = -1; | |
935 | int minor = -1; | |
531b1094 | 936 | |
51a87c55 | 937 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 938 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
939 | switch (type) { |
940 | case 'c': | |
941 | inode->i_mode &= ~S_IFBLK; | |
942 | inode->i_mode |= S_IFCHR; | |
943 | break; | |
944 | case 'b': | |
945 | break; | |
946 | default: | |
bd238fb4 | 947 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
948 | "Unknown special type %c %s\n", type, |
949 | stat->extension); | |
2bad8471 EVH |
950 | }; |
951 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 952 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
953 | } else |
954 | inode->i_rdev = 0; | |
955 | ||
7549ae3e | 956 | i_size_write(inode, stat->length); |
2bad8471 | 957 | |
bd238fb4 | 958 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 959 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
960 | } |
961 | ||
962 | /** | |
963 | * v9fs_qid2ino - convert qid into inode number | |
964 | * @qid: qid to hash | |
965 | * | |
966 | * BUG: potential for inode number collisions? | |
967 | */ | |
968 | ||
bd238fb4 | 969 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
970 | { |
971 | u64 path = qid->path + 2; | |
972 | ino_t i = 0; | |
973 | ||
974 | if (sizeof(ino_t) == sizeof(path)) | |
975 | memcpy(&i, &path, sizeof(ino_t)); | |
976 | else | |
977 | i = (ino_t) (path ^ (path >> 32)); | |
978 | ||
979 | return i; | |
980 | } | |
981 | ||
2bad8471 EVH |
982 | /** |
983 | * v9fs_readlink - read a symlink's location (internal version) | |
984 | * @dentry: dentry for symlink | |
73c592b9 | 985 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
986 | * @buflen: length of buffer |
987 | * | |
988 | */ | |
989 | ||
990 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
991 | { | |
bd238fb4 | 992 | int retval; |
2bad8471 | 993 | |
bd238fb4 LI |
994 | struct v9fs_session_info *v9ses; |
995 | struct p9_fid *fid; | |
51a87c55 | 996 | struct p9_wstat *st; |
2bad8471 | 997 | |
bd238fb4 LI |
998 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
999 | retval = -EPERM; | |
1000 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1001 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1002 | if (IS_ERR(fid)) |
da977b2c | 1003 | return PTR_ERR(fid); |
2bad8471 | 1004 | |
dd6102fb | 1005 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1006 | return -EBADF; |
2bad8471 | 1007 | |
bd238fb4 LI |
1008 | st = p9_client_stat(fid); |
1009 | if (IS_ERR(st)) | |
1010 | return PTR_ERR(st); | |
2bad8471 | 1011 | |
bd238fb4 | 1012 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1013 | retval = -EINVAL; |
bd238fb4 | 1014 | goto done; |
2bad8471 EVH |
1015 | } |
1016 | ||
1017 | /* copy extension buffer into buffer */ | |
51a87c55 | 1018 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1019 | |
bd238fb4 | 1020 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1021 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1022 | |
2511cd0b | 1023 | retval = strnlen(buffer, buflen); |
bd238fb4 LI |
1024 | done: |
1025 | kfree(st); | |
2bad8471 EVH |
1026 | return retval; |
1027 | } | |
1028 | ||
2bad8471 EVH |
1029 | /** |
1030 | * v9fs_vfs_follow_link - follow a symlink path | |
1031 | * @dentry: dentry for symlink | |
1032 | * @nd: nameidata | |
1033 | * | |
1034 | */ | |
1035 | ||
1036 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1037 | { | |
1038 | int len = 0; | |
1039 | char *link = __getname(); | |
1040 | ||
bd238fb4 | 1041 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1042 | |
1043 | if (!link) | |
1044 | link = ERR_PTR(-ENOMEM); | |
1045 | else { | |
16cce6d2 | 1046 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1047 | |
1048 | if (len < 0) { | |
ce44eeb6 | 1049 | __putname(link); |
2bad8471 EVH |
1050 | link = ERR_PTR(len); |
1051 | } else | |
2511cd0b | 1052 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1053 | } |
1054 | nd_set_link(nd, link); | |
1055 | ||
1056 | return NULL; | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * v9fs_vfs_put_link - release a symlink path | |
1061 | * @dentry: dentry for symlink | |
1062 | * @nd: nameidata | |
ee443996 | 1063 | * @p: unused |
2bad8471 EVH |
1064 | * |
1065 | */ | |
1066 | ||
ee443996 EVH |
1067 | static void |
1068 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1069 | { |
1070 | char *s = nd_get_link(nd); | |
1071 | ||
6ff23207 DG |
1072 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1073 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1074 | if (!IS_ERR(s)) |
ce44eeb6 | 1075 | __putname(s); |
2bad8471 EVH |
1076 | } |
1077 | ||
ee443996 EVH |
1078 | /** |
1079 | * v9fs_vfs_mkspecial - create a special file | |
1080 | * @dir: inode to create special file in | |
1081 | * @dentry: dentry to create | |
1082 | * @mode: mode to create special file | |
1083 | * @extension: 9p2000.u format extension string representing special file | |
1084 | * | |
1085 | */ | |
1086 | ||
531b1094 LI |
1087 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1088 | int mode, const char *extension) | |
2bad8471 | 1089 | { |
bd238fb4 | 1090 | u32 perm; |
531b1094 | 1091 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1092 | struct p9_fid *fid; |
2bad8471 | 1093 | |
6a3124a3 | 1094 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1095 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1096 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1097 | return -EPERM; |
2bad8471 EVH |
1098 | } |
1099 | ||
da977b2c | 1100 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1101 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1102 | P9_OREAD); | |
1103 | if (IS_ERR(fid)) | |
1104 | return PTR_ERR(fid); | |
da977b2c | 1105 | |
bd238fb4 | 1106 | p9_client_clunk(fid); |
6a3124a3 | 1107 | return 0; |
531b1094 LI |
1108 | } |
1109 | ||
1110 | /** | |
1111 | * v9fs_vfs_symlink - helper function to create symlinks | |
1112 | * @dir: directory inode containing symlink | |
1113 | * @dentry: dentry for symlink | |
1114 | * @symname: symlink data | |
1115 | * | |
ee443996 | 1116 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1117 | * |
1118 | */ | |
1119 | ||
1120 | static int | |
1121 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1122 | { | |
bd238fb4 LI |
1123 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1124 | dentry->d_name.name, symname); | |
531b1094 LI |
1125 | |
1126 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * v9fs_vfs_link - create a hardlink | |
1131 | * @old_dentry: dentry for file to link to | |
1132 | * @dir: inode destination for new link | |
1133 | * @dentry: dentry for link | |
1134 | * | |
1135 | */ | |
1136 | ||
531b1094 LI |
1137 | static int |
1138 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1139 | struct dentry *dentry) | |
1140 | { | |
1141 | int retval; | |
bd238fb4 | 1142 | struct p9_fid *oldfid; |
531b1094 LI |
1143 | char *name; |
1144 | ||
bd238fb4 LI |
1145 | P9_DPRINTK(P9_DEBUG_VFS, |
1146 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1147 | old_dentry->d_name.name); |
1148 | ||
da977b2c | 1149 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1150 | if (IS_ERR(oldfid)) |
da977b2c | 1151 | return PTR_ERR(oldfid); |
531b1094 LI |
1152 | |
1153 | name = __getname(); | |
da977b2c EVH |
1154 | if (unlikely(!name)) { |
1155 | retval = -ENOMEM; | |
1156 | goto clunk_fid; | |
1157 | } | |
0710d36a | 1158 | |
16cce6d2 | 1159 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1160 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1161 | __putname(name); |
2bad8471 | 1162 | |
da977b2c | 1163 | clunk_fid: |
bd238fb4 | 1164 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1165 | return retval; |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * v9fs_vfs_mknod - create a special file | |
1170 | * @dir: inode destination for new link | |
1171 | * @dentry: dentry for file | |
1172 | * @mode: mode for creation | |
ee443996 | 1173 | * @rdev: device associated with special file |
2bad8471 EVH |
1174 | * |
1175 | */ | |
1176 | ||
1177 | static int | |
1178 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1179 | { | |
531b1094 LI |
1180 | int retval; |
1181 | char *name; | |
2bad8471 | 1182 | |
bd238fb4 LI |
1183 | P9_DPRINTK(P9_DEBUG_VFS, |
1184 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1185 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1186 | ||
531b1094 LI |
1187 | if (!new_valid_dev(rdev)) |
1188 | return -EINVAL; | |
2bad8471 | 1189 | |
531b1094 | 1190 | name = __getname(); |
c0291a05 ET |
1191 | if (!name) |
1192 | return -ENOMEM; | |
2bad8471 EVH |
1193 | /* build extension */ |
1194 | if (S_ISBLK(mode)) | |
531b1094 | 1195 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1196 | else if (S_ISCHR(mode)) |
531b1094 | 1197 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1198 | else if (S_ISFIFO(mode)) |
531b1094 | 1199 | *name = 0; |
2bad8471 | 1200 | else { |
531b1094 LI |
1201 | __putname(name); |
1202 | return -EINVAL; | |
2bad8471 EVH |
1203 | } |
1204 | ||
531b1094 LI |
1205 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1206 | __putname(name); | |
2bad8471 EVH |
1207 | |
1208 | return retval; | |
1209 | } | |
1210 | ||
754661f1 | 1211 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1212 | .create = v9fs_vfs_create, |
1213 | .lookup = v9fs_vfs_lookup, | |
1214 | .symlink = v9fs_vfs_symlink, | |
1215 | .link = v9fs_vfs_link, | |
1216 | .unlink = v9fs_vfs_unlink, | |
1217 | .mkdir = v9fs_vfs_mkdir, | |
1218 | .rmdir = v9fs_vfs_rmdir, | |
1219 | .mknod = v9fs_vfs_mknod, | |
1220 | .rename = v9fs_vfs_rename, | |
2bad8471 EVH |
1221 | .getattr = v9fs_vfs_getattr, |
1222 | .setattr = v9fs_vfs_setattr, | |
1223 | }; | |
1224 | ||
754661f1 | 1225 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1226 | .create = v9fs_vfs_create, |
1227 | .lookup = v9fs_vfs_lookup, | |
1228 | .unlink = v9fs_vfs_unlink, | |
1229 | .mkdir = v9fs_vfs_mkdir, | |
1230 | .rmdir = v9fs_vfs_rmdir, | |
1231 | .mknod = v9fs_vfs_mknod, | |
1232 | .rename = v9fs_vfs_rename, | |
1233 | .getattr = v9fs_vfs_getattr, | |
1234 | .setattr = v9fs_vfs_setattr, | |
1235 | }; | |
1236 | ||
754661f1 | 1237 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1238 | .getattr = v9fs_vfs_getattr, |
1239 | .setattr = v9fs_vfs_setattr, | |
1240 | }; | |
1241 | ||
754661f1 | 1242 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1243 | .readlink = generic_readlink, |
2bad8471 EVH |
1244 | .follow_link = v9fs_vfs_follow_link, |
1245 | .put_link = v9fs_vfs_put_link, | |
1246 | .getattr = v9fs_vfs_getattr, | |
1247 | .setattr = v9fs_vfs_setattr, | |
1248 | }; |