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Commit | Line | Data |
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2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
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 | { | |
bd238fb4 LI |
435 | struct inode *file_inode; |
436 | struct v9fs_session_info *v9ses; | |
437 | struct p9_fid *v9fid; | |
2bad8471 | 438 | |
bd238fb4 | 439 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
440 | rmdir); |
441 | ||
442 | file_inode = file->d_inode; | |
2bad8471 | 443 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 444 | v9fid = v9fs_fid_clone(file); |
ba17674f | 445 | if (IS_ERR(v9fid)) |
da977b2c | 446 | return PTR_ERR(v9fid); |
2bad8471 | 447 | |
bd238fb4 | 448 | return p9_client_remove(v9fid); |
2bad8471 EVH |
449 | } |
450 | ||
6a3124a3 LI |
451 | static int |
452 | v9fs_open_created(struct inode *inode, struct file *file) | |
453 | { | |
454 | return 0; | |
455 | } | |
456 | ||
bd238fb4 | 457 | |
2bad8471 | 458 | /** |
bd238fb4 | 459 | * v9fs_create - Create a file |
ee443996 EVH |
460 | * @v9ses: session information |
461 | * @dir: directory that dentry is being created in | |
bd238fb4 | 462 | * @dentry: dentry that is being created |
0e15597e | 463 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
464 | * @perm: create permissions |
465 | * @mode: open mode | |
2bad8471 EVH |
466 | * |
467 | */ | |
bd238fb4 LI |
468 | static struct p9_fid * |
469 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
470 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 471 | { |
6a3124a3 | 472 | int err; |
bd238fb4 LI |
473 | char *name; |
474 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 475 | struct inode *inode; |
6a3124a3 | 476 | |
51a87c55 EVH |
477 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
478 | ||
bd238fb4 LI |
479 | err = 0; |
480 | ofid = NULL; | |
481 | fid = NULL; | |
482 | name = (char *) dentry->d_name.name; | |
da977b2c | 483 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 484 | if (IS_ERR(dfid)) { |
da977b2c | 485 | err = PTR_ERR(dfid); |
51a87c55 | 486 | P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); |
bd238fb4 | 487 | dfid = NULL; |
da977b2c EVH |
488 | goto error; |
489 | } | |
6a3124a3 | 490 | |
bd238fb4 LI |
491 | /* clone a fid to use for creation */ |
492 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
493 | if (IS_ERR(ofid)) { | |
494 | err = PTR_ERR(ofid); | |
51a87c55 | 495 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 LI |
496 | ofid = NULL; |
497 | goto error; | |
498 | } | |
6a3124a3 | 499 | |
bd238fb4 | 500 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
501 | if (err < 0) { |
502 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 503 | goto error; |
51a87c55 | 504 | } |
6a3124a3 | 505 | |
bd238fb4 LI |
506 | /* now walk from the parent so we can get unopened fid */ |
507 | fid = p9_client_walk(dfid, 1, &name, 0); | |
508 | if (IS_ERR(fid)) { | |
509 | err = PTR_ERR(fid); | |
51a87c55 | 510 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 511 | fid = NULL; |
6a3124a3 | 512 | goto error; |
bd238fb4 LI |
513 | } else |
514 | dfid = NULL; | |
6a3124a3 | 515 | |
bd238fb4 LI |
516 | /* instantiate inode and assign the unopened fid to the dentry */ |
517 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
518 | if (IS_ERR(inode)) { |
519 | err = PTR_ERR(inode); | |
51a87c55 | 520 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
521 | goto error; |
522 | } | |
523 | ||
ba17674f | 524 | if (v9ses->cache) |
e03abc0c EVH |
525 | dentry->d_op = &v9fs_cached_dentry_operations; |
526 | else | |
527 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 528 | |
6a3124a3 | 529 | d_instantiate(dentry, inode); |
50fb6d2b AK |
530 | err = v9fs_fid_add(dentry, fid); |
531 | if (err < 0) | |
532 | goto error; | |
533 | ||
bd238fb4 | 534 | return ofid; |
6a3124a3 | 535 | |
bd238fb4 LI |
536 | error: |
537 | if (dfid) | |
538 | p9_client_clunk(dfid); | |
539 | ||
540 | if (ofid) | |
541 | p9_client_clunk(ofid); | |
542 | ||
543 | if (fid) | |
544 | p9_client_clunk(fid); | |
545 | ||
546 | return ERR_PTR(err); | |
547 | } | |
548 | ||
549 | /** | |
550 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 551 | * @dir: directory inode that is being created |
bd238fb4 LI |
552 | * @dentry: dentry that is being deleted |
553 | * @mode: create permissions | |
554 | * @nd: path information | |
555 | * | |
556 | */ | |
6a3124a3 | 557 | |
bd238fb4 LI |
558 | static int |
559 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
560 | struct nameidata *nd) | |
561 | { | |
562 | int err; | |
563 | u32 perm; | |
564 | int flags; | |
565 | struct v9fs_session_info *v9ses; | |
566 | struct p9_fid *fid; | |
567 | struct file *filp; | |
568 | ||
569 | err = 0; | |
570 | fid = NULL; | |
571 | v9ses = v9fs_inode2v9ses(dir); | |
572 | perm = unixmode2p9mode(v9ses, mode); | |
573 | if (nd && nd->flags & LOOKUP_OPEN) | |
574 | flags = nd->intent.open.flags - 1; | |
575 | else | |
576 | flags = O_RDWR; | |
577 | ||
578 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
579 | v9fs_uflags2omode(flags, |
580 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
581 | if (IS_ERR(fid)) { |
582 | err = PTR_ERR(fid); | |
583 | fid = NULL; | |
584 | goto error; | |
585 | } | |
586 | ||
587 | /* if we are opening a file, assign the open fid to the file */ | |
588 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
589 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
590 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
591 | err = PTR_ERR(filp); |
592 | goto error; | |
6a3124a3 LI |
593 | } |
594 | ||
bd238fb4 LI |
595 | filp->private_data = fid; |
596 | } else | |
597 | p9_client_clunk(fid); | |
6a3124a3 LI |
598 | |
599 | return 0; | |
600 | ||
601 | error: | |
bd238fb4 LI |
602 | if (fid) |
603 | p9_client_clunk(fid); | |
6a3124a3 | 604 | |
6a3124a3 | 605 | return err; |
2bad8471 EVH |
606 | } |
607 | ||
608 | /** | |
609 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 610 | * @dir: inode that is being unlinked |
2bad8471 EVH |
611 | * @dentry: dentry that is being unlinked |
612 | * @mode: mode for new directory | |
613 | * | |
614 | */ | |
615 | ||
6a3124a3 | 616 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 617 | { |
6a3124a3 | 618 | int err; |
bd238fb4 | 619 | u32 perm; |
6a3124a3 | 620 | struct v9fs_session_info *v9ses; |
bd238fb4 | 621 | struct p9_fid *fid; |
6a3124a3 | 622 | |
bd238fb4 LI |
623 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
624 | err = 0; | |
6a3124a3 | 625 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 626 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
627 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
628 | if (IS_ERR(fid)) { | |
629 | err = PTR_ERR(fid); | |
630 | fid = NULL; | |
6a3124a3 LI |
631 | } |
632 | ||
bd238fb4 LI |
633 | if (fid) |
634 | p9_client_clunk(fid); | |
6a3124a3 | 635 | |
6a3124a3 | 636 | return err; |
2bad8471 EVH |
637 | } |
638 | ||
639 | /** | |
640 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
641 | * @dir: inode that is being walked from | |
642 | * @dentry: dentry that is being walked to? | |
643 | * @nameidata: path data | |
644 | * | |
645 | */ | |
646 | ||
647 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
648 | struct nameidata *nameidata) | |
649 | { | |
650 | struct super_block *sb; | |
651 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 652 | struct p9_fid *dfid, *fid; |
2bad8471 | 653 | struct inode *inode; |
bd238fb4 | 654 | char *name; |
2bad8471 EVH |
655 | int result = 0; |
656 | ||
bd238fb4 | 657 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 658 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
659 | |
660 | sb = dir->i_sb; | |
661 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
662 | dfid = v9fs_fid_lookup(dentry->d_parent); |
663 | if (IS_ERR(dfid)) | |
e231c2ee | 664 | return ERR_CAST(dfid); |
bd238fb4 LI |
665 | |
666 | name = (char *) dentry->d_name.name; | |
667 | fid = p9_client_walk(dfid, 1, &name, 1); | |
668 | if (IS_ERR(fid)) { | |
669 | result = PTR_ERR(fid); | |
2bad8471 EVH |
670 | if (result == -ENOENT) { |
671 | d_add(dentry, NULL); | |
2bad8471 EVH |
672 | return NULL; |
673 | } | |
2bad8471 | 674 | |
bd238fb4 | 675 | return ERR_PTR(result); |
2bad8471 EVH |
676 | } |
677 | ||
bd238fb4 LI |
678 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
679 | if (IS_ERR(inode)) { | |
680 | result = PTR_ERR(inode); | |
681 | inode = NULL; | |
682 | goto error; | |
2bad8471 EVH |
683 | } |
684 | ||
bd238fb4 | 685 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 686 | if (result < 0) |
bd238fb4 | 687 | goto error; |
6a3124a3 | 688 | |
ba17674f | 689 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
690 | dentry->d_op = &v9fs_cached_dentry_operations; |
691 | else | |
692 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
693 | |
694 | d_add(dentry, inode); | |
2bad8471 EVH |
695 | return NULL; |
696 | ||
bd238fb4 | 697 | error: |
62aa528e | 698 | p9_client_clunk(fid); |
da977b2c | 699 | |
2bad8471 EVH |
700 | return ERR_PTR(result); |
701 | } | |
702 | ||
703 | /** | |
704 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
705 | * @i: inode that is being unlinked | |
73c592b9 | 706 | * @d: dentry that is being unlinked |
2bad8471 EVH |
707 | * |
708 | */ | |
709 | ||
710 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
711 | { | |
712 | return v9fs_remove(i, d, 0); | |
713 | } | |
714 | ||
715 | /** | |
716 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
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_rmdir(struct inode *i, struct dentry *d) | |
723 | { | |
724 | return v9fs_remove(i, d, 1); | |
725 | } | |
726 | ||
727 | /** | |
728 | * v9fs_vfs_rename - VFS hook to rename an inode | |
729 | * @old_dir: old dir inode | |
730 | * @old_dentry: old dentry | |
731 | * @new_dir: new dir inode | |
732 | * @new_dentry: new dentry | |
733 | * | |
734 | */ | |
735 | ||
736 | static int | |
737 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
738 | struct inode *new_dir, struct dentry *new_dentry) | |
739 | { | |
bd238fb4 LI |
740 | struct inode *old_inode; |
741 | struct v9fs_session_info *v9ses; | |
742 | struct p9_fid *oldfid; | |
743 | struct p9_fid *olddirfid; | |
744 | struct p9_fid *newdirfid; | |
745 | struct p9_wstat wstat; | |
746 | int retval; | |
2bad8471 | 747 | |
bd238fb4 LI |
748 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
749 | retval = 0; | |
750 | old_inode = old_dentry->d_inode; | |
751 | v9ses = v9fs_inode2v9ses(old_inode); | |
752 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 753 | if (IS_ERR(oldfid)) |
da977b2c EVH |
754 | return PTR_ERR(oldfid); |
755 | ||
756 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 757 | if (IS_ERR(olddirfid)) { |
da977b2c | 758 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 759 | goto done; |
da977b2c EVH |
760 | } |
761 | ||
762 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 763 | if (IS_ERR(newdirfid)) { |
da977b2c | 764 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 765 | goto clunk_olddir; |
2bad8471 EVH |
766 | } |
767 | ||
768 | /* 9P can only handle file rename in the same directory */ | |
769 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
770 | P9_DPRINTK(P9_DEBUG_ERROR, |
771 | "old dir and new dir are different\n"); | |
621997cd | 772 | retval = -EXDEV; |
bd238fb4 | 773 | goto clunk_newdir; |
2bad8471 EVH |
774 | } |
775 | ||
531b1094 | 776 | v9fs_blank_wstat(&wstat); |
ba17674f | 777 | wstat.muid = v9ses->uname; |
531b1094 | 778 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 779 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 780 | |
bd238fb4 | 781 | clunk_newdir: |
22150c4f | 782 | p9_client_clunk(newdirfid); |
2bad8471 | 783 | |
bd238fb4 | 784 | clunk_olddir: |
22150c4f | 785 | p9_client_clunk(olddirfid); |
da977b2c | 786 | |
bd238fb4 | 787 | done: |
2bad8471 EVH |
788 | return retval; |
789 | } | |
790 | ||
791 | /** | |
943ffb58 | 792 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
793 | * @mnt: mount information |
794 | * @dentry: file to get attributes on | |
795 | * @stat: metadata structure to populate | |
2bad8471 EVH |
796 | * |
797 | */ | |
798 | ||
799 | static int | |
800 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
801 | struct kstat *stat) | |
802 | { | |
bd238fb4 LI |
803 | int err; |
804 | struct v9fs_session_info *v9ses; | |
805 | struct p9_fid *fid; | |
51a87c55 | 806 | struct p9_wstat *st; |
bd238fb4 LI |
807 | |
808 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
809 | err = -EPERM; | |
810 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 811 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
812 | return simple_getattr(mnt, dentry, stat); |
813 | ||
bd238fb4 LI |
814 | fid = v9fs_fid_lookup(dentry); |
815 | if (IS_ERR(fid)) | |
da977b2c | 816 | return PTR_ERR(fid); |
2bad8471 | 817 | |
bd238fb4 LI |
818 | st = p9_client_stat(fid); |
819 | if (IS_ERR(st)) | |
820 | return PTR_ERR(st); | |
2bad8471 | 821 | |
bd238fb4 | 822 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 823 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 824 | |
bd238fb4 LI |
825 | kfree(st); |
826 | return 0; | |
2bad8471 EVH |
827 | } |
828 | ||
829 | /** | |
830 | * v9fs_vfs_setattr - set file metadata | |
831 | * @dentry: file whose metadata to set | |
832 | * @iattr: metadata assignment structure | |
833 | * | |
834 | */ | |
835 | ||
836 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
837 | { | |
bd238fb4 LI |
838 | int retval; |
839 | struct v9fs_session_info *v9ses; | |
840 | struct p9_fid *fid; | |
841 | struct p9_wstat wstat; | |
2bad8471 | 842 | |
bd238fb4 LI |
843 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
844 | retval = -EPERM; | |
845 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
846 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
847 | if(IS_ERR(fid)) |
848 | return PTR_ERR(fid); | |
2bad8471 | 849 | |
531b1094 | 850 | v9fs_blank_wstat(&wstat); |
2bad8471 | 851 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 852 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
853 | |
854 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 855 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
856 | |
857 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 858 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
859 | |
860 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 861 | wstat.length = iattr->ia_size; |
2bad8471 | 862 | |
dd6102fb | 863 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
864 | if (iattr->ia_valid & ATTR_UID) |
865 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 866 | |
531b1094 LI |
867 | if (iattr->ia_valid & ATTR_GID) |
868 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
869 | } |
870 | ||
bd238fb4 LI |
871 | retval = p9_client_wstat(fid, &wstat); |
872 | if (retval >= 0) | |
873 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 874 | |
bd238fb4 | 875 | return retval; |
2bad8471 EVH |
876 | } |
877 | ||
878 | /** | |
531b1094 LI |
879 | * v9fs_stat2inode - populate an inode structure with mistat info |
880 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
881 | * @inode: inode to populate |
882 | * @sb: superblock of filesystem | |
883 | * | |
884 | */ | |
885 | ||
886 | void | |
51a87c55 | 887 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 888 | struct super_block *sb) |
2bad8471 | 889 | { |
531b1094 | 890 | char ext[32]; |
5717144a AK |
891 | char tag_name[14]; |
892 | unsigned int i_nlink; | |
2bad8471 EVH |
893 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
894 | ||
895 | inode->i_nlink = 1; | |
896 | ||
531b1094 LI |
897 | inode->i_atime.tv_sec = stat->atime; |
898 | inode->i_mtime.tv_sec = stat->mtime; | |
899 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 900 | |
bd32b82d LI |
901 | inode->i_uid = v9ses->dfltuid; |
902 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 903 | |
dd6102fb | 904 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
905 | inode->i_uid = stat->n_uid; |
906 | inode->i_gid = stat->n_gid; | |
2bad8471 | 907 | } |
5717144a AK |
908 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
909 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
910 | /* | |
911 | * Hadlink support got added later to | |
912 | * to the .u extension. So there can be | |
913 | * server out there that doesn't support | |
914 | * this even with .u extension. So check | |
915 | * for non NULL stat->extension | |
916 | */ | |
917 | strncpy(ext, stat->extension, sizeof(ext)); | |
918 | /* HARDLINKCOUNT %u */ | |
919 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
920 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
921 | inode->i_nlink = i_nlink; | |
922 | } | |
923 | } | |
531b1094 | 924 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
925 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
926 | char type = 0; | |
927 | int major = -1; | |
928 | int minor = -1; | |
531b1094 | 929 | |
51a87c55 | 930 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 931 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
932 | switch (type) { |
933 | case 'c': | |
934 | inode->i_mode &= ~S_IFBLK; | |
935 | inode->i_mode |= S_IFCHR; | |
936 | break; | |
937 | case 'b': | |
938 | break; | |
939 | default: | |
bd238fb4 | 940 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
941 | "Unknown special type %c %s\n", type, |
942 | stat->extension); | |
2bad8471 EVH |
943 | }; |
944 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 945 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
946 | } else |
947 | inode->i_rdev = 0; | |
948 | ||
7549ae3e | 949 | i_size_write(inode, stat->length); |
2bad8471 | 950 | |
bd238fb4 | 951 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 952 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
953 | } |
954 | ||
955 | /** | |
956 | * v9fs_qid2ino - convert qid into inode number | |
957 | * @qid: qid to hash | |
958 | * | |
959 | * BUG: potential for inode number collisions? | |
960 | */ | |
961 | ||
bd238fb4 | 962 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
963 | { |
964 | u64 path = qid->path + 2; | |
965 | ino_t i = 0; | |
966 | ||
967 | if (sizeof(ino_t) == sizeof(path)) | |
968 | memcpy(&i, &path, sizeof(ino_t)); | |
969 | else | |
970 | i = (ino_t) (path ^ (path >> 32)); | |
971 | ||
972 | return i; | |
973 | } | |
974 | ||
2bad8471 EVH |
975 | /** |
976 | * v9fs_readlink - read a symlink's location (internal version) | |
977 | * @dentry: dentry for symlink | |
73c592b9 | 978 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
979 | * @buflen: length of buffer |
980 | * | |
981 | */ | |
982 | ||
983 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
984 | { | |
bd238fb4 | 985 | int retval; |
2bad8471 | 986 | |
bd238fb4 LI |
987 | struct v9fs_session_info *v9ses; |
988 | struct p9_fid *fid; | |
51a87c55 | 989 | struct p9_wstat *st; |
2bad8471 | 990 | |
bd238fb4 LI |
991 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
992 | retval = -EPERM; | |
993 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
994 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 995 | if (IS_ERR(fid)) |
da977b2c | 996 | return PTR_ERR(fid); |
2bad8471 | 997 | |
dd6102fb | 998 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 999 | return -EBADF; |
2bad8471 | 1000 | |
bd238fb4 LI |
1001 | st = p9_client_stat(fid); |
1002 | if (IS_ERR(st)) | |
1003 | return PTR_ERR(st); | |
2bad8471 | 1004 | |
bd238fb4 | 1005 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1006 | retval = -EINVAL; |
bd238fb4 | 1007 | goto done; |
2bad8471 EVH |
1008 | } |
1009 | ||
1010 | /* copy extension buffer into buffer */ | |
51a87c55 | 1011 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1012 | |
bd238fb4 | 1013 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1014 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1015 | |
2511cd0b | 1016 | retval = strnlen(buffer, buflen); |
bd238fb4 LI |
1017 | done: |
1018 | kfree(st); | |
2bad8471 EVH |
1019 | return retval; |
1020 | } | |
1021 | ||
2bad8471 EVH |
1022 | /** |
1023 | * v9fs_vfs_follow_link - follow a symlink path | |
1024 | * @dentry: dentry for symlink | |
1025 | * @nd: nameidata | |
1026 | * | |
1027 | */ | |
1028 | ||
1029 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1030 | { | |
1031 | int len = 0; | |
1032 | char *link = __getname(); | |
1033 | ||
bd238fb4 | 1034 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1035 | |
1036 | if (!link) | |
1037 | link = ERR_PTR(-ENOMEM); | |
1038 | else { | |
16cce6d2 | 1039 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1040 | |
1041 | if (len < 0) { | |
ce44eeb6 | 1042 | __putname(link); |
2bad8471 EVH |
1043 | link = ERR_PTR(len); |
1044 | } else | |
2511cd0b | 1045 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1046 | } |
1047 | nd_set_link(nd, link); | |
1048 | ||
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * v9fs_vfs_put_link - release a symlink path | |
1054 | * @dentry: dentry for symlink | |
1055 | * @nd: nameidata | |
ee443996 | 1056 | * @p: unused |
2bad8471 EVH |
1057 | * |
1058 | */ | |
1059 | ||
ee443996 EVH |
1060 | static void |
1061 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1062 | { |
1063 | char *s = nd_get_link(nd); | |
1064 | ||
6ff23207 DG |
1065 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1066 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1067 | if (!IS_ERR(s)) |
ce44eeb6 | 1068 | __putname(s); |
2bad8471 EVH |
1069 | } |
1070 | ||
ee443996 EVH |
1071 | /** |
1072 | * v9fs_vfs_mkspecial - create a special file | |
1073 | * @dir: inode to create special file in | |
1074 | * @dentry: dentry to create | |
1075 | * @mode: mode to create special file | |
1076 | * @extension: 9p2000.u format extension string representing special file | |
1077 | * | |
1078 | */ | |
1079 | ||
531b1094 LI |
1080 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1081 | int mode, const char *extension) | |
2bad8471 | 1082 | { |
bd238fb4 | 1083 | u32 perm; |
531b1094 | 1084 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1085 | struct p9_fid *fid; |
2bad8471 | 1086 | |
6a3124a3 | 1087 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1088 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1089 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1090 | return -EPERM; |
2bad8471 EVH |
1091 | } |
1092 | ||
da977b2c | 1093 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1094 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1095 | P9_OREAD); | |
1096 | if (IS_ERR(fid)) | |
1097 | return PTR_ERR(fid); | |
da977b2c | 1098 | |
bd238fb4 | 1099 | p9_client_clunk(fid); |
6a3124a3 | 1100 | return 0; |
531b1094 LI |
1101 | } |
1102 | ||
1103 | /** | |
1104 | * v9fs_vfs_symlink - helper function to create symlinks | |
1105 | * @dir: directory inode containing symlink | |
1106 | * @dentry: dentry for symlink | |
1107 | * @symname: symlink data | |
1108 | * | |
ee443996 | 1109 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1110 | * |
1111 | */ | |
1112 | ||
1113 | static int | |
1114 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1115 | { | |
bd238fb4 LI |
1116 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1117 | dentry->d_name.name, symname); | |
531b1094 LI |
1118 | |
1119 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * v9fs_vfs_link - create a hardlink | |
1124 | * @old_dentry: dentry for file to link to | |
1125 | * @dir: inode destination for new link | |
1126 | * @dentry: dentry for link | |
1127 | * | |
1128 | */ | |
1129 | ||
531b1094 LI |
1130 | static int |
1131 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1132 | struct dentry *dentry) | |
1133 | { | |
1134 | int retval; | |
bd238fb4 | 1135 | struct p9_fid *oldfid; |
531b1094 LI |
1136 | char *name; |
1137 | ||
bd238fb4 LI |
1138 | P9_DPRINTK(P9_DEBUG_VFS, |
1139 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1140 | old_dentry->d_name.name); |
1141 | ||
da977b2c | 1142 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1143 | if (IS_ERR(oldfid)) |
da977b2c | 1144 | return PTR_ERR(oldfid); |
531b1094 LI |
1145 | |
1146 | name = __getname(); | |
da977b2c EVH |
1147 | if (unlikely(!name)) { |
1148 | retval = -ENOMEM; | |
1149 | goto clunk_fid; | |
1150 | } | |
0710d36a | 1151 | |
16cce6d2 | 1152 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1153 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1154 | __putname(name); |
2bad8471 | 1155 | |
da977b2c | 1156 | clunk_fid: |
bd238fb4 | 1157 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1158 | return retval; |
1159 | } | |
1160 | ||
1161 | /** | |
1162 | * v9fs_vfs_mknod - create a special file | |
1163 | * @dir: inode destination for new link | |
1164 | * @dentry: dentry for file | |
1165 | * @mode: mode for creation | |
ee443996 | 1166 | * @rdev: device associated with special file |
2bad8471 EVH |
1167 | * |
1168 | */ | |
1169 | ||
1170 | static int | |
1171 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1172 | { | |
531b1094 LI |
1173 | int retval; |
1174 | char *name; | |
2bad8471 | 1175 | |
bd238fb4 LI |
1176 | P9_DPRINTK(P9_DEBUG_VFS, |
1177 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1178 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1179 | ||
531b1094 LI |
1180 | if (!new_valid_dev(rdev)) |
1181 | return -EINVAL; | |
2bad8471 | 1182 | |
531b1094 | 1183 | name = __getname(); |
c0291a05 ET |
1184 | if (!name) |
1185 | return -ENOMEM; | |
2bad8471 EVH |
1186 | /* build extension */ |
1187 | if (S_ISBLK(mode)) | |
531b1094 | 1188 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1189 | else if (S_ISCHR(mode)) |
531b1094 | 1190 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1191 | else if (S_ISFIFO(mode)) |
531b1094 | 1192 | *name = 0; |
2bad8471 | 1193 | else { |
531b1094 LI |
1194 | __putname(name); |
1195 | return -EINVAL; | |
2bad8471 EVH |
1196 | } |
1197 | ||
531b1094 LI |
1198 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1199 | __putname(name); | |
2bad8471 EVH |
1200 | |
1201 | return retval; | |
1202 | } | |
1203 | ||
754661f1 | 1204 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1205 | .create = v9fs_vfs_create, |
1206 | .lookup = v9fs_vfs_lookup, | |
1207 | .symlink = v9fs_vfs_symlink, | |
1208 | .link = v9fs_vfs_link, | |
1209 | .unlink = v9fs_vfs_unlink, | |
1210 | .mkdir = v9fs_vfs_mkdir, | |
1211 | .rmdir = v9fs_vfs_rmdir, | |
1212 | .mknod = v9fs_vfs_mknod, | |
1213 | .rename = v9fs_vfs_rename, | |
2bad8471 EVH |
1214 | .getattr = v9fs_vfs_getattr, |
1215 | .setattr = v9fs_vfs_setattr, | |
1216 | }; | |
1217 | ||
754661f1 | 1218 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1219 | .create = v9fs_vfs_create, |
1220 | .lookup = v9fs_vfs_lookup, | |
1221 | .unlink = v9fs_vfs_unlink, | |
1222 | .mkdir = v9fs_vfs_mkdir, | |
1223 | .rmdir = v9fs_vfs_rmdir, | |
1224 | .mknod = v9fs_vfs_mknod, | |
1225 | .rename = v9fs_vfs_rename, | |
1226 | .getattr = v9fs_vfs_getattr, | |
1227 | .setattr = v9fs_vfs_setattr, | |
1228 | }; | |
1229 | ||
754661f1 | 1230 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1231 | .getattr = v9fs_vfs_getattr, |
1232 | .setattr = v9fs_vfs_setattr, | |
1233 | }; | |
1234 | ||
754661f1 | 1235 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1236 | .readlink = generic_readlink, |
2bad8471 EVH |
1237 | .follow_link = v9fs_vfs_follow_link, |
1238 | .put_link = v9fs_vfs_put_link, | |
1239 | .getattr = v9fs_vfs_getattr, | |
1240 | .setattr = v9fs_vfs_setattr, | |
1241 | }; |