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> |
ebf46264 | 38 | #include <linux/xattr.h> |
85ff872d | 39 | #include <linux/posix_acl.h> |
bd238fb4 LI |
40 | #include <net/9p/9p.h> |
41 | #include <net/9p/client.h> | |
2bad8471 | 42 | |
2bad8471 | 43 | #include "v9fs.h" |
2bad8471 | 44 | #include "v9fs_vfs.h" |
2bad8471 | 45 | #include "fid.h" |
60e78d2c | 46 | #include "cache.h" |
ebf46264 | 47 | #include "xattr.h" |
85ff872d | 48 | #include "acl.h" |
2bad8471 | 49 | |
754661f1 | 50 | static const struct inode_operations v9fs_dir_inode_operations; |
9b6533c9 | 51 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
754661f1 AV |
52 | static const struct inode_operations v9fs_file_inode_operations; |
53 | static const struct inode_operations v9fs_symlink_inode_operations; | |
f5fc6145 | 54 | |
2bad8471 EVH |
55 | /** |
56 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
57 | * @v9ses: v9fs session information | |
58 | * @mode: mode to convert | |
59 | * | |
60 | */ | |
61 | ||
73c592b9 | 62 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
63 | { |
64 | int res; | |
65 | res = mode & 0777; | |
66 | if (S_ISDIR(mode)) | |
bd238fb4 | 67 | res |= P9_DMDIR; |
dd6102fb | 68 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 69 | if (S_ISLNK(mode)) |
bd238fb4 | 70 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
71 | if (v9ses->nodev == 0) { |
72 | if (S_ISSOCK(mode)) | |
bd238fb4 | 73 | res |= P9_DMSOCKET; |
2bad8471 | 74 | if (S_ISFIFO(mode)) |
bd238fb4 | 75 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 76 | if (S_ISBLK(mode)) |
bd238fb4 | 77 | res |= P9_DMDEVICE; |
2bad8471 | 78 | if (S_ISCHR(mode)) |
bd238fb4 | 79 | res |= P9_DMDEVICE; |
2bad8471 EVH |
80 | } |
81 | ||
82 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 83 | res |= P9_DMSETUID; |
2bad8471 | 84 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 85 | res |= P9_DMSETGID; |
d199d652 AL |
86 | if ((mode & S_ISVTX) == S_ISVTX) |
87 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
88 | if ((mode & P9_DMLINK)) |
89 | res |= P9_DMLINK; | |
2bad8471 EVH |
90 | } |
91 | ||
92 | return res; | |
93 | } | |
94 | ||
95 | /** | |
96 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
97 | * @v9ses: v9fs session information | |
98 | * @mode: mode to convert | |
99 | * | |
100 | */ | |
101 | ||
73c592b9 | 102 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
103 | { |
104 | int res; | |
105 | ||
106 | res = mode & 0777; | |
107 | ||
bd238fb4 | 108 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 109 | res |= S_IFDIR; |
dd6102fb | 110 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 111 | res |= S_IFLNK; |
dd6102fb | 112 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
113 | && (v9ses->nodev == 0)) |
114 | res |= S_IFSOCK; | |
dd6102fb | 115 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
116 | && (v9ses->nodev == 0)) |
117 | res |= S_IFIFO; | |
dd6102fb | 118 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
119 | && (v9ses->nodev == 0)) |
120 | res |= S_IFBLK; | |
121 | else | |
122 | res |= S_IFREG; | |
123 | ||
dd6102fb | 124 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 125 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
126 | res |= S_ISUID; |
127 | ||
bd238fb4 | 128 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 129 | res |= S_ISGID; |
d199d652 AL |
130 | |
131 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
132 | res |= S_ISVTX; | |
2bad8471 EVH |
133 | } |
134 | ||
135 | return res; | |
136 | } | |
137 | ||
ee443996 EVH |
138 | /** |
139 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
140 | * @uflags: flags to convert | |
2e4bef41 | 141 | * @extended: if .u extensions are active |
ee443996 EVH |
142 | */ |
143 | ||
2e4bef41 | 144 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
145 | { |
146 | int ret; | |
147 | ||
148 | ret = 0; | |
149 | switch (uflags&3) { | |
150 | default: | |
151 | case O_RDONLY: | |
bd238fb4 | 152 | ret = P9_OREAD; |
6a3124a3 LI |
153 | break; |
154 | ||
155 | case O_WRONLY: | |
bd238fb4 | 156 | ret = P9_OWRITE; |
6a3124a3 LI |
157 | break; |
158 | ||
159 | case O_RDWR: | |
bd238fb4 | 160 | ret = P9_ORDWR; |
6a3124a3 LI |
161 | break; |
162 | } | |
163 | ||
6a3124a3 | 164 | if (uflags & O_TRUNC) |
bd238fb4 | 165 | ret |= P9_OTRUNC; |
6a3124a3 | 166 | |
2e4bef41 EVH |
167 | if (extended) { |
168 | if (uflags & O_EXCL) | |
169 | ret |= P9_OEXCL; | |
170 | ||
171 | if (uflags & O_APPEND) | |
172 | ret |= P9_OAPPEND; | |
173 | } | |
6a3124a3 LI |
174 | |
175 | return ret; | |
176 | } | |
177 | ||
2bad8471 | 178 | /** |
531b1094 | 179 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 180 | * @wstat: structure to initialize |
2bad8471 EVH |
181 | * |
182 | */ | |
183 | ||
7a4439c4 | 184 | void |
bd238fb4 | 185 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 186 | { |
531b1094 LI |
187 | wstat->type = ~0; |
188 | wstat->dev = ~0; | |
189 | wstat->qid.type = ~0; | |
190 | wstat->qid.version = ~0; | |
191 | *((long long *)&wstat->qid.path) = ~0; | |
192 | wstat->mode = ~0; | |
193 | wstat->atime = ~0; | |
194 | wstat->mtime = ~0; | |
195 | wstat->length = ~0; | |
196 | wstat->name = NULL; | |
197 | wstat->uid = NULL; | |
198 | wstat->gid = NULL; | |
199 | wstat->muid = NULL; | |
200 | wstat->n_uid = ~0; | |
201 | wstat->n_gid = ~0; | |
202 | wstat->n_muid = ~0; | |
203 | wstat->extension = NULL; | |
2bad8471 EVH |
204 | } |
205 | ||
60e78d2c AK |
206 | #ifdef CONFIG_9P_FSCACHE |
207 | /** | |
208 | * v9fs_alloc_inode - helper function to allocate an inode | |
209 | * This callback is executed before setting up the inode so that we | |
210 | * can associate a vcookie with each inode. | |
211 | * | |
212 | */ | |
213 | ||
214 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
215 | { | |
216 | struct v9fs_cookie *vcookie; | |
217 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
218 | GFP_KERNEL); | |
219 | if (!vcookie) | |
220 | return NULL; | |
221 | ||
222 | vcookie->fscache = NULL; | |
223 | vcookie->qid = NULL; | |
224 | spin_lock_init(&vcookie->lock); | |
225 | return &vcookie->inode; | |
226 | } | |
227 | ||
228 | /** | |
229 | * v9fs_destroy_inode - destroy an inode | |
230 | * | |
231 | */ | |
232 | ||
fa0d7e3d | 233 | static void v9fs_i_callback(struct rcu_head *head) |
60e78d2c | 234 | { |
fa0d7e3d NP |
235 | struct inode *inode = container_of(head, struct inode, i_rcu); |
236 | INIT_LIST_HEAD(&inode->i_dentry); | |
60e78d2c AK |
237 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); |
238 | } | |
fa0d7e3d NP |
239 | |
240 | void v9fs_destroy_inode(struct inode *inode) | |
241 | { | |
242 | call_rcu(&inode->i_rcu, v9fs_i_callback); | |
243 | } | |
60e78d2c AK |
244 | #endif |
245 | ||
2bad8471 EVH |
246 | /** |
247 | * v9fs_get_inode - helper function to setup an inode | |
248 | * @sb: superblock | |
249 | * @mode: mode to setup inode with | |
250 | * | |
251 | */ | |
252 | ||
253 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
254 | { | |
2bb54115 | 255 | int err; |
6a3124a3 | 256 | struct inode *inode; |
b501611a | 257 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 258 | |
bd238fb4 | 259 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
260 | |
261 | inode = new_inode(sb); | |
2bb54115 AK |
262 | if (!inode) { |
263 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 264 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
265 | } |
266 | ||
217f206d | 267 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
268 | inode->i_blocks = 0; |
269 | inode->i_rdev = 0; | |
270 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
271 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
272 | ||
273 | switch (mode & S_IFMT) { | |
274 | case S_IFIFO: | |
275 | case S_IFBLK: | |
276 | case S_IFCHR: | |
277 | case S_IFSOCK: | |
4b43516a MK |
278 | if (v9fs_proto_dotl(v9ses)) { |
279 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
280 | inode->i_fop = &v9fs_file_operations_dotl; | |
281 | } else if (v9fs_proto_dotu(v9ses)) { | |
282 | inode->i_op = &v9fs_file_inode_operations; | |
283 | inode->i_fop = &v9fs_file_operations; | |
284 | } else { | |
bd238fb4 | 285 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
286 | "special files without extended mode\n"); |
287 | err = -EINVAL; | |
288 | goto error; | |
2bad8471 | 289 | } |
2bb54115 AK |
290 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
291 | break; | |
292 | case S_IFREG: | |
9b6533c9 SK |
293 | if (v9fs_proto_dotl(v9ses)) { |
294 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
29236f4e AK |
295 | if (v9ses->cache) |
296 | inode->i_fop = | |
297 | &v9fs_cached_file_operations_dotl; | |
298 | else | |
299 | inode->i_fop = &v9fs_file_operations_dotl; | |
9b6533c9 SK |
300 | } else { |
301 | inode->i_op = &v9fs_file_inode_operations; | |
29236f4e AK |
302 | if (v9ses->cache) |
303 | inode->i_fop = &v9fs_cached_file_operations; | |
304 | else | |
305 | inode->i_fop = &v9fs_file_operations; | |
9b6533c9 SK |
306 | } |
307 | ||
2bb54115 | 308 | break; |
9b6533c9 | 309 | |
2bb54115 | 310 | case S_IFLNK: |
9b6533c9 SK |
311 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
312 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
313 | "legacy protocol.\n"); | |
2bb54115 AK |
314 | err = -EINVAL; |
315 | goto error; | |
316 | } | |
9b6533c9 SK |
317 | |
318 | if (v9fs_proto_dotl(v9ses)) | |
319 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
320 | else | |
321 | inode->i_op = &v9fs_symlink_inode_operations; | |
322 | ||
2bb54115 AK |
323 | break; |
324 | case S_IFDIR: | |
325 | inc_nlink(inode); | |
9b6533c9 SK |
326 | if (v9fs_proto_dotl(v9ses)) |
327 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
328 | else if (v9fs_proto_dotu(v9ses)) | |
329 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
330 | else |
331 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
332 | |
333 | if (v9fs_proto_dotl(v9ses)) | |
334 | inode->i_fop = &v9fs_dir_operations_dotl; | |
335 | else | |
336 | inode->i_fop = &v9fs_dir_operations; | |
337 | ||
2bb54115 AK |
338 | break; |
339 | default: | |
340 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
341 | mode, mode & S_IFMT); | |
342 | err = -EINVAL; | |
343 | goto error; | |
2bad8471 | 344 | } |
2bb54115 | 345 | |
2bad8471 | 346 | return inode; |
2bb54115 AK |
347 | |
348 | error: | |
349 | iput(inode); | |
350 | return ERR_PTR(err); | |
2bad8471 EVH |
351 | } |
352 | ||
bd238fb4 | 353 | /* |
6a3124a3 LI |
354 | static struct v9fs_fid* |
355 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
356 | { | |
357 | int err; | |
736c4b85 | 358 | int nfid; |
6a3124a3 LI |
359 | struct v9fs_fid *ret; |
360 | struct v9fs_fcall *fcall; | |
361 | ||
362 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
363 | if (nfid < 0) { | |
0b8dd177 | 364 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 365 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
366 | } |
367 | ||
6a3124a3 LI |
368 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
369 | &fcall); | |
370 | ||
371 | if (err < 0) { | |
41e5a6ac LI |
372 | if (fcall && fcall->id == RWALK) |
373 | goto clunk_fid; | |
374 | ||
6a3124a3 LI |
375 | PRINT_FCALL_ERROR("walk error", fcall); |
376 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
377 | goto error; | |
0b8dd177 | 378 | } |
6a3124a3 | 379 | |
3cf6429a LI |
380 | kfree(fcall); |
381 | fcall = NULL; | |
6a3124a3 LI |
382 | ret = v9fs_fid_create(v9ses, nfid); |
383 | if (!ret) { | |
384 | err = -ENOMEM; | |
385 | goto clunk_fid; | |
386 | } | |
0b8dd177 | 387 | |
6a3124a3 LI |
388 | err = v9fs_fid_insert(ret, dentry); |
389 | if (err < 0) { | |
390 | v9fs_fid_destroy(ret); | |
391 | goto clunk_fid; | |
0b8dd177 | 392 | } |
2bad8471 | 393 | |
6a3124a3 | 394 | return ret; |
2bad8471 | 395 | |
6a3124a3 LI |
396 | clunk_fid: |
397 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 398 | |
6a3124a3 LI |
399 | error: |
400 | kfree(fcall); | |
401 | return ERR_PTR(err); | |
402 | } | |
bd238fb4 | 403 | */ |
2bad8471 | 404 | |
60e78d2c AK |
405 | |
406 | /** | |
407 | * v9fs_clear_inode - release an inode | |
408 | * @inode: inode to release | |
409 | * | |
410 | */ | |
b57922d9 | 411 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 412 | { |
b57922d9 AV |
413 | truncate_inode_pages(inode->i_mapping, 0); |
414 | end_writeback(inode); | |
60e78d2c AK |
415 | filemap_fdatawrite(inode->i_mapping); |
416 | ||
417 | #ifdef CONFIG_9P_FSCACHE | |
418 | v9fs_cache_inode_put_cookie(inode); | |
419 | #endif | |
420 | } | |
421 | ||
53c06f4e | 422 | struct inode * |
f0853122 | 423 | v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
424 | struct super_block *sb) |
425 | { | |
426 | int err, umode; | |
f0853122 | 427 | struct inode *ret = NULL; |
51a87c55 | 428 | struct p9_wstat *st; |
531b1094 | 429 | |
bd238fb4 | 430 | st = p9_client_stat(fid); |
02bc3567 AK |
431 | if (IS_ERR(st)) |
432 | return ERR_CAST(st); | |
2bad8471 | 433 | |
bd238fb4 | 434 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
435 | ret = v9fs_get_inode(sb, umode); |
436 | if (IS_ERR(ret)) { | |
437 | err = PTR_ERR(ret); | |
6a3124a3 LI |
438 | goto error; |
439 | } | |
2bad8471 | 440 | |
bd238fb4 LI |
441 | v9fs_stat2inode(st, ret, sb); |
442 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
443 | |
444 | #ifdef CONFIG_9P_FSCACHE | |
445 | v9fs_vcookie_set_qid(ret, &st->qid); | |
446 | v9fs_cache_inode_get_cookie(ret); | |
447 | #endif | |
02bc3567 | 448 | p9stat_free(st); |
bd238fb4 | 449 | kfree(st); |
6a3124a3 | 450 | return ret; |
6a3124a3 | 451 | error: |
02bc3567 | 452 | p9stat_free(st); |
bd238fb4 | 453 | kfree(st); |
6a3124a3 | 454 | return ERR_PTR(err); |
2bad8471 EVH |
455 | } |
456 | ||
457 | /** | |
458 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
459 | * @dir: directory inode that is being deleted |
460 | * @file: dentry that is being deleted | |
461 | * @rmdir: removing a directory | |
2bad8471 EVH |
462 | * |
463 | */ | |
464 | ||
465 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
466 | { | |
d994f405 | 467 | int retval; |
bd238fb4 | 468 | struct inode *file_inode; |
bd238fb4 | 469 | struct p9_fid *v9fid; |
2bad8471 | 470 | |
bd238fb4 | 471 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
472 | rmdir); |
473 | ||
474 | file_inode = file->d_inode; | |
c959df9f | 475 | v9fid = v9fs_fid_clone(file); |
ba17674f | 476 | if (IS_ERR(v9fid)) |
da977b2c | 477 | return PTR_ERR(v9fid); |
2bad8471 | 478 | |
d994f405 AK |
479 | retval = p9_client_remove(v9fid); |
480 | if (!retval) | |
481 | drop_nlink(file_inode); | |
482 | return retval; | |
2bad8471 EVH |
483 | } |
484 | ||
485 | /** | |
bd238fb4 | 486 | * v9fs_create - Create a file |
ee443996 EVH |
487 | * @v9ses: session information |
488 | * @dir: directory that dentry is being created in | |
bd238fb4 | 489 | * @dentry: dentry that is being created |
0e15597e | 490 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
491 | * @perm: create permissions |
492 | * @mode: open mode | |
2bad8471 EVH |
493 | * |
494 | */ | |
bd238fb4 LI |
495 | static struct p9_fid * |
496 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
497 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 498 | { |
6a3124a3 | 499 | int err; |
bd238fb4 LI |
500 | char *name; |
501 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 502 | struct inode *inode; |
6a3124a3 | 503 | |
51a87c55 EVH |
504 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
505 | ||
bd238fb4 LI |
506 | err = 0; |
507 | ofid = NULL; | |
508 | fid = NULL; | |
509 | name = (char *) dentry->d_name.name; | |
6d27e64d | 510 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 511 | if (IS_ERR(dfid)) { |
da977b2c | 512 | err = PTR_ERR(dfid); |
6d27e64d VJ |
513 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
514 | return ERR_PTR(err); | |
da977b2c | 515 | } |
6a3124a3 | 516 | |
bd238fb4 LI |
517 | /* clone a fid to use for creation */ |
518 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
519 | if (IS_ERR(ofid)) { | |
520 | err = PTR_ERR(ofid); | |
51a87c55 | 521 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 522 | return ERR_PTR(err); |
bd238fb4 | 523 | } |
6a3124a3 | 524 | |
bd238fb4 | 525 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
526 | if (err < 0) { |
527 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 528 | goto error; |
51a87c55 | 529 | } |
6a3124a3 | 530 | |
bd238fb4 | 531 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 532 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
533 | if (IS_ERR(fid)) { |
534 | err = PTR_ERR(fid); | |
51a87c55 | 535 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 536 | fid = NULL; |
6a3124a3 | 537 | goto error; |
6d27e64d | 538 | } |
6a3124a3 | 539 | |
bd238fb4 LI |
540 | /* instantiate inode and assign the unopened fid to the dentry */ |
541 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
542 | if (IS_ERR(inode)) { |
543 | err = PTR_ERR(inode); | |
51a87c55 | 544 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
545 | goto error; |
546 | } | |
6a3124a3 | 547 | d_instantiate(dentry, inode); |
50fb6d2b AK |
548 | err = v9fs_fid_add(dentry, fid); |
549 | if (err < 0) | |
550 | goto error; | |
551 | ||
bd238fb4 | 552 | return ofid; |
6a3124a3 | 553 | |
bd238fb4 | 554 | error: |
bd238fb4 LI |
555 | if (ofid) |
556 | p9_client_clunk(ofid); | |
557 | ||
558 | if (fid) | |
559 | p9_client_clunk(fid); | |
560 | ||
561 | return ERR_PTR(err); | |
562 | } | |
563 | ||
564 | /** | |
565 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 566 | * @dir: directory inode that is being created |
bd238fb4 LI |
567 | * @dentry: dentry that is being deleted |
568 | * @mode: create permissions | |
569 | * @nd: path information | |
570 | * | |
571 | */ | |
6a3124a3 | 572 | |
bd238fb4 LI |
573 | static int |
574 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
575 | struct nameidata *nd) | |
576 | { | |
577 | int err; | |
578 | u32 perm; | |
579 | int flags; | |
580 | struct v9fs_session_info *v9ses; | |
581 | struct p9_fid *fid; | |
582 | struct file *filp; | |
583 | ||
584 | err = 0; | |
585 | fid = NULL; | |
586 | v9ses = v9fs_inode2v9ses(dir); | |
587 | perm = unixmode2p9mode(v9ses, mode); | |
588 | if (nd && nd->flags & LOOKUP_OPEN) | |
589 | flags = nd->intent.open.flags - 1; | |
590 | else | |
591 | flags = O_RDWR; | |
592 | ||
593 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
594 | v9fs_uflags2omode(flags, |
595 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
596 | if (IS_ERR(fid)) { |
597 | err = PTR_ERR(fid); | |
598 | fid = NULL; | |
599 | goto error; | |
600 | } | |
601 | ||
602 | /* if we are opening a file, assign the open fid to the file */ | |
603 | if (nd && nd->flags & LOOKUP_OPEN) { | |
877cb3d4 | 604 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
6a3124a3 | 605 | if (IS_ERR(filp)) { |
bd238fb4 LI |
606 | err = PTR_ERR(filp); |
607 | goto error; | |
6a3124a3 LI |
608 | } |
609 | ||
bd238fb4 | 610 | filp->private_data = fid; |
46848de0 AK |
611 | #ifdef CONFIG_9P_FSCACHE |
612 | if (v9ses->cache) | |
613 | v9fs_cache_inode_set_cookie(dentry->d_inode, filp); | |
614 | #endif | |
bd238fb4 LI |
615 | } else |
616 | p9_client_clunk(fid); | |
6a3124a3 LI |
617 | |
618 | return 0; | |
619 | ||
620 | error: | |
bd238fb4 LI |
621 | if (fid) |
622 | p9_client_clunk(fid); | |
6a3124a3 | 623 | |
6a3124a3 | 624 | return err; |
2bad8471 EVH |
625 | } |
626 | ||
627 | /** | |
628 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 629 | * @dir: inode that is being unlinked |
2bad8471 EVH |
630 | * @dentry: dentry that is being unlinked |
631 | * @mode: mode for new directory | |
632 | * | |
633 | */ | |
634 | ||
6a3124a3 | 635 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 636 | { |
6a3124a3 | 637 | int err; |
bd238fb4 | 638 | u32 perm; |
6a3124a3 | 639 | struct v9fs_session_info *v9ses; |
bd238fb4 | 640 | struct p9_fid *fid; |
6a3124a3 | 641 | |
bd238fb4 LI |
642 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
643 | err = 0; | |
6a3124a3 | 644 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 645 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
646 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
647 | if (IS_ERR(fid)) { | |
648 | err = PTR_ERR(fid); | |
649 | fid = NULL; | |
6a3124a3 LI |
650 | } |
651 | ||
bd238fb4 LI |
652 | if (fid) |
653 | p9_client_clunk(fid); | |
6a3124a3 | 654 | |
6a3124a3 | 655 | return err; |
2bad8471 EVH |
656 | } |
657 | ||
658 | /** | |
659 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
660 | * @dir: inode that is being walked from | |
661 | * @dentry: dentry that is being walked to? | |
662 | * @nameidata: path data | |
663 | * | |
664 | */ | |
665 | ||
53c06f4e | 666 | struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
2bad8471 EVH |
667 | struct nameidata *nameidata) |
668 | { | |
669 | struct super_block *sb; | |
670 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 671 | struct p9_fid *dfid, *fid; |
2bad8471 | 672 | struct inode *inode; |
bd238fb4 | 673 | char *name; |
2bad8471 EVH |
674 | int result = 0; |
675 | ||
bd238fb4 | 676 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 677 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 678 | |
11e9b49b SK |
679 | if (dentry->d_name.len > NAME_MAX) |
680 | return ERR_PTR(-ENAMETOOLONG); | |
681 | ||
2bad8471 EVH |
682 | sb = dir->i_sb; |
683 | v9ses = v9fs_inode2v9ses(dir); | |
a534c8d1 | 684 | /* We can walk d_parent because we hold the dir->i_mutex */ |
bd238fb4 LI |
685 | dfid = v9fs_fid_lookup(dentry->d_parent); |
686 | if (IS_ERR(dfid)) | |
e231c2ee | 687 | return ERR_CAST(dfid); |
bd238fb4 LI |
688 | |
689 | name = (char *) dentry->d_name.name; | |
690 | fid = p9_client_walk(dfid, 1, &name, 1); | |
691 | if (IS_ERR(fid)) { | |
692 | result = PTR_ERR(fid); | |
2bad8471 | 693 | if (result == -ENOENT) { |
85e0df24 AK |
694 | inode = NULL; |
695 | goto inst_out; | |
2bad8471 | 696 | } |
2bad8471 | 697 | |
bd238fb4 | 698 | return ERR_PTR(result); |
2bad8471 EVH |
699 | } |
700 | ||
bd238fb4 LI |
701 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
702 | if (IS_ERR(inode)) { | |
703 | result = PTR_ERR(inode); | |
704 | inode = NULL; | |
705 | goto error; | |
2bad8471 EVH |
706 | } |
707 | ||
bd238fb4 | 708 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 709 | if (result < 0) |
9856af8b | 710 | goto error_iput; |
6a3124a3 | 711 | |
85e0df24 | 712 | inst_out: |
2bad8471 | 713 | d_add(dentry, inode); |
2bad8471 EVH |
714 | return NULL; |
715 | ||
9856af8b AK |
716 | error_iput: |
717 | iput(inode); | |
bd238fb4 | 718 | error: |
62aa528e | 719 | p9_client_clunk(fid); |
da977b2c | 720 | |
2bad8471 EVH |
721 | return ERR_PTR(result); |
722 | } | |
723 | ||
724 | /** | |
725 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
726 | * @i: inode that is being unlinked | |
73c592b9 | 727 | * @d: dentry that is being unlinked |
2bad8471 EVH |
728 | * |
729 | */ | |
730 | ||
53c06f4e | 731 | int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
2bad8471 EVH |
732 | { |
733 | return v9fs_remove(i, d, 0); | |
734 | } | |
735 | ||
736 | /** | |
737 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
738 | * @i: inode that is being unlinked | |
73c592b9 | 739 | * @d: dentry that is being unlinked |
2bad8471 EVH |
740 | * |
741 | */ | |
742 | ||
53c06f4e | 743 | int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
2bad8471 EVH |
744 | { |
745 | return v9fs_remove(i, d, 1); | |
746 | } | |
747 | ||
748 | /** | |
749 | * v9fs_vfs_rename - VFS hook to rename an inode | |
750 | * @old_dir: old dir inode | |
751 | * @old_dentry: old dentry | |
752 | * @new_dir: new dir inode | |
753 | * @new_dentry: new dentry | |
754 | * | |
755 | */ | |
756 | ||
53c06f4e | 757 | int |
2bad8471 EVH |
758 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
759 | struct inode *new_dir, struct dentry *new_dentry) | |
760 | { | |
bd238fb4 LI |
761 | struct inode *old_inode; |
762 | struct v9fs_session_info *v9ses; | |
763 | struct p9_fid *oldfid; | |
764 | struct p9_fid *olddirfid; | |
765 | struct p9_fid *newdirfid; | |
766 | struct p9_wstat wstat; | |
767 | int retval; | |
2bad8471 | 768 | |
bd238fb4 LI |
769 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
770 | retval = 0; | |
771 | old_inode = old_dentry->d_inode; | |
772 | v9ses = v9fs_inode2v9ses(old_inode); | |
773 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 774 | if (IS_ERR(oldfid)) |
da977b2c EVH |
775 | return PTR_ERR(oldfid); |
776 | ||
777 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 778 | if (IS_ERR(olddirfid)) { |
da977b2c | 779 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 780 | goto done; |
da977b2c EVH |
781 | } |
782 | ||
783 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 784 | if (IS_ERR(newdirfid)) { |
da977b2c | 785 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 786 | goto clunk_olddir; |
2bad8471 EVH |
787 | } |
788 | ||
a534c8d1 | 789 | down_write(&v9ses->rename_sem); |
4681dbda SK |
790 | if (v9fs_proto_dotl(v9ses)) { |
791 | retval = p9_client_rename(oldfid, newdirfid, | |
792 | (char *) new_dentry->d_name.name); | |
793 | if (retval != -ENOSYS) | |
794 | goto clunk_newdir; | |
795 | } | |
a534c8d1 AK |
796 | if (old_dentry->d_parent != new_dentry->d_parent) { |
797 | /* | |
798 | * 9P .u can only handle file rename in the same directory | |
799 | */ | |
4681dbda | 800 | |
bd238fb4 LI |
801 | P9_DPRINTK(P9_DEBUG_ERROR, |
802 | "old dir and new dir are different\n"); | |
621997cd | 803 | retval = -EXDEV; |
bd238fb4 | 804 | goto clunk_newdir; |
2bad8471 | 805 | } |
531b1094 | 806 | v9fs_blank_wstat(&wstat); |
ba17674f | 807 | wstat.muid = v9ses->uname; |
531b1094 | 808 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 809 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 810 | |
bd238fb4 | 811 | clunk_newdir: |
a534c8d1 AK |
812 | if (!retval) |
813 | /* successful rename */ | |
814 | d_move(old_dentry, new_dentry); | |
815 | up_write(&v9ses->rename_sem); | |
22150c4f | 816 | p9_client_clunk(newdirfid); |
2bad8471 | 817 | |
bd238fb4 | 818 | clunk_olddir: |
22150c4f | 819 | p9_client_clunk(olddirfid); |
da977b2c | 820 | |
bd238fb4 | 821 | done: |
2bad8471 EVH |
822 | return retval; |
823 | } | |
824 | ||
825 | /** | |
943ffb58 | 826 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
827 | * @mnt: mount information |
828 | * @dentry: file to get attributes on | |
829 | * @stat: metadata structure to populate | |
2bad8471 EVH |
830 | * |
831 | */ | |
832 | ||
833 | static int | |
834 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
835 | struct kstat *stat) | |
836 | { | |
bd238fb4 LI |
837 | int err; |
838 | struct v9fs_session_info *v9ses; | |
839 | struct p9_fid *fid; | |
51a87c55 | 840 | struct p9_wstat *st; |
bd238fb4 LI |
841 | |
842 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
843 | err = -EPERM; | |
844 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 845 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
846 | return simple_getattr(mnt, dentry, stat); |
847 | ||
bd238fb4 LI |
848 | fid = v9fs_fid_lookup(dentry); |
849 | if (IS_ERR(fid)) | |
da977b2c | 850 | return PTR_ERR(fid); |
2bad8471 | 851 | |
bd238fb4 LI |
852 | st = p9_client_stat(fid); |
853 | if (IS_ERR(st)) | |
854 | return PTR_ERR(st); | |
2bad8471 | 855 | |
bd238fb4 | 856 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 857 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 858 | |
62b2be59 | 859 | p9stat_free(st); |
bd238fb4 LI |
860 | kfree(st); |
861 | return 0; | |
2bad8471 EVH |
862 | } |
863 | ||
864 | /** | |
865 | * v9fs_vfs_setattr - set file metadata | |
866 | * @dentry: file whose metadata to set | |
867 | * @iattr: metadata assignment structure | |
868 | * | |
869 | */ | |
870 | ||
871 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
872 | { | |
bd238fb4 LI |
873 | int retval; |
874 | struct v9fs_session_info *v9ses; | |
875 | struct p9_fid *fid; | |
876 | struct p9_wstat wstat; | |
2bad8471 | 877 | |
bd238fb4 LI |
878 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
879 | retval = -EPERM; | |
880 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
881 | fid = v9fs_fid_lookup(dentry); | |
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 | 897 | |
dd6102fb | 898 | if (v9fs_proto_dotu(v9ses)) { |
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 | ||
bd238fb4 | 906 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
907 | if (retval < 0) |
908 | return retval; | |
2bad8471 | 909 | |
1025774c CH |
910 | if ((iattr->ia_valid & ATTR_SIZE) && |
911 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
912 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
913 | if (retval) | |
914 | return retval; | |
915 | } | |
2bad8471 | 916 | |
1025774c CH |
917 | setattr_copy(dentry->d_inode, iattr); |
918 | mark_inode_dirty(dentry->d_inode); | |
919 | return 0; | |
2bad8471 EVH |
920 | } |
921 | ||
922 | /** | |
531b1094 LI |
923 | * v9fs_stat2inode - populate an inode structure with mistat info |
924 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
925 | * @inode: inode to populate |
926 | * @sb: superblock of filesystem | |
927 | * | |
928 | */ | |
929 | ||
930 | void | |
51a87c55 | 931 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 932 | struct super_block *sb) |
2bad8471 | 933 | { |
531b1094 | 934 | char ext[32]; |
5717144a AK |
935 | char tag_name[14]; |
936 | unsigned int i_nlink; | |
2bad8471 EVH |
937 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
938 | ||
939 | inode->i_nlink = 1; | |
940 | ||
531b1094 LI |
941 | inode->i_atime.tv_sec = stat->atime; |
942 | inode->i_mtime.tv_sec = stat->mtime; | |
943 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 944 | |
bd32b82d LI |
945 | inode->i_uid = v9ses->dfltuid; |
946 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 947 | |
dd6102fb | 948 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
949 | inode->i_uid = stat->n_uid; |
950 | inode->i_gid = stat->n_gid; | |
2bad8471 | 951 | } |
5717144a AK |
952 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
953 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
954 | /* | |
955 | * Hadlink support got added later to | |
956 | * to the .u extension. So there can be | |
957 | * server out there that doesn't support | |
958 | * this even with .u extension. So check | |
959 | * for non NULL stat->extension | |
960 | */ | |
961 | strncpy(ext, stat->extension, sizeof(ext)); | |
962 | /* HARDLINKCOUNT %u */ | |
963 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
964 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
965 | inode->i_nlink = i_nlink; | |
966 | } | |
967 | } | |
531b1094 | 968 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
969 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
970 | char type = 0; | |
971 | int major = -1; | |
972 | int minor = -1; | |
531b1094 | 973 | |
51a87c55 | 974 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 975 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
976 | switch (type) { |
977 | case 'c': | |
978 | inode->i_mode &= ~S_IFBLK; | |
979 | inode->i_mode |= S_IFCHR; | |
980 | break; | |
981 | case 'b': | |
982 | break; | |
983 | default: | |
bd238fb4 | 984 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
985 | "Unknown special type %c %s\n", type, |
986 | stat->extension); | |
2bad8471 EVH |
987 | }; |
988 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 989 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
990 | } else |
991 | inode->i_rdev = 0; | |
992 | ||
7549ae3e | 993 | i_size_write(inode, stat->length); |
2bad8471 | 994 | |
bd238fb4 | 995 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 996 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
997 | } |
998 | ||
999 | /** | |
1000 | * v9fs_qid2ino - convert qid into inode number | |
1001 | * @qid: qid to hash | |
1002 | * | |
1003 | * BUG: potential for inode number collisions? | |
1004 | */ | |
1005 | ||
bd238fb4 | 1006 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
1007 | { |
1008 | u64 path = qid->path + 2; | |
1009 | ino_t i = 0; | |
1010 | ||
1011 | if (sizeof(ino_t) == sizeof(path)) | |
1012 | memcpy(&i, &path, sizeof(ino_t)); | |
1013 | else | |
1014 | i = (ino_t) (path ^ (path >> 32)); | |
1015 | ||
1016 | return i; | |
1017 | } | |
1018 | ||
2bad8471 EVH |
1019 | /** |
1020 | * v9fs_readlink - read a symlink's location (internal version) | |
1021 | * @dentry: dentry for symlink | |
73c592b9 | 1022 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1023 | * @buflen: length of buffer |
1024 | * | |
1025 | */ | |
1026 | ||
1027 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1028 | { | |
bd238fb4 | 1029 | int retval; |
2bad8471 | 1030 | |
bd238fb4 LI |
1031 | struct v9fs_session_info *v9ses; |
1032 | struct p9_fid *fid; | |
51a87c55 | 1033 | struct p9_wstat *st; |
2bad8471 | 1034 | |
bd238fb4 LI |
1035 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1036 | retval = -EPERM; | |
1037 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1038 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1039 | if (IS_ERR(fid)) |
da977b2c | 1040 | return PTR_ERR(fid); |
2bad8471 | 1041 | |
329176cc | 1042 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1043 | return -EBADF; |
2bad8471 | 1044 | |
bd238fb4 LI |
1045 | st = p9_client_stat(fid); |
1046 | if (IS_ERR(st)) | |
1047 | return PTR_ERR(st); | |
2bad8471 | 1048 | |
bd238fb4 | 1049 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1050 | retval = -EINVAL; |
bd238fb4 | 1051 | goto done; |
2bad8471 EVH |
1052 | } |
1053 | ||
1054 | /* copy extension buffer into buffer */ | |
51a87c55 | 1055 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1056 | |
bd238fb4 | 1057 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1058 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1059 | |
2511cd0b | 1060 | retval = strnlen(buffer, buflen); |
bd238fb4 | 1061 | done: |
62b2be59 | 1062 | p9stat_free(st); |
bd238fb4 | 1063 | kfree(st); |
2bad8471 EVH |
1064 | return retval; |
1065 | } | |
1066 | ||
2bad8471 EVH |
1067 | /** |
1068 | * v9fs_vfs_follow_link - follow a symlink path | |
1069 | * @dentry: dentry for symlink | |
1070 | * @nd: nameidata | |
1071 | * | |
1072 | */ | |
1073 | ||
1074 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1075 | { | |
1076 | int len = 0; | |
1077 | char *link = __getname(); | |
1078 | ||
bd238fb4 | 1079 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1080 | |
1081 | if (!link) | |
1082 | link = ERR_PTR(-ENOMEM); | |
1083 | else { | |
16cce6d2 | 1084 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1085 | |
1086 | if (len < 0) { | |
ce44eeb6 | 1087 | __putname(link); |
2bad8471 EVH |
1088 | link = ERR_PTR(len); |
1089 | } else | |
2511cd0b | 1090 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1091 | } |
1092 | nd_set_link(nd, link); | |
1093 | ||
1094 | return NULL; | |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * v9fs_vfs_put_link - release a symlink path | |
1099 | * @dentry: dentry for symlink | |
1100 | * @nd: nameidata | |
ee443996 | 1101 | * @p: unused |
2bad8471 EVH |
1102 | * |
1103 | */ | |
1104 | ||
53c06f4e | 1105 | void |
ee443996 | 1106 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
2bad8471 EVH |
1107 | { |
1108 | char *s = nd_get_link(nd); | |
1109 | ||
6ff23207 DG |
1110 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1111 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1112 | if (!IS_ERR(s)) |
ce44eeb6 | 1113 | __putname(s); |
2bad8471 EVH |
1114 | } |
1115 | ||
ee443996 EVH |
1116 | /** |
1117 | * v9fs_vfs_mkspecial - create a special file | |
1118 | * @dir: inode to create special file in | |
1119 | * @dentry: dentry to create | |
1120 | * @mode: mode to create special file | |
1121 | * @extension: 9p2000.u format extension string representing special file | |
1122 | * | |
1123 | */ | |
1124 | ||
531b1094 LI |
1125 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1126 | int mode, const char *extension) | |
2bad8471 | 1127 | { |
bd238fb4 | 1128 | u32 perm; |
531b1094 | 1129 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1130 | struct p9_fid *fid; |
2bad8471 | 1131 | |
6a3124a3 | 1132 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1133 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1134 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1135 | return -EPERM; |
2bad8471 EVH |
1136 | } |
1137 | ||
da977b2c | 1138 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1139 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1140 | P9_OREAD); | |
1141 | if (IS_ERR(fid)) | |
1142 | return PTR_ERR(fid); | |
da977b2c | 1143 | |
bd238fb4 | 1144 | p9_client_clunk(fid); |
6a3124a3 | 1145 | return 0; |
531b1094 LI |
1146 | } |
1147 | ||
1148 | /** | |
1149 | * v9fs_vfs_symlink - helper function to create symlinks | |
1150 | * @dir: directory inode containing symlink | |
1151 | * @dentry: dentry for symlink | |
1152 | * @symname: symlink data | |
1153 | * | |
ee443996 | 1154 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1155 | * |
1156 | */ | |
1157 | ||
1158 | static int | |
1159 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1160 | { | |
bd238fb4 LI |
1161 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1162 | dentry->d_name.name, symname); | |
531b1094 LI |
1163 | |
1164 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * v9fs_vfs_link - create a hardlink | |
1169 | * @old_dentry: dentry for file to link to | |
1170 | * @dir: inode destination for new link | |
1171 | * @dentry: dentry for link | |
1172 | * | |
1173 | */ | |
1174 | ||
531b1094 LI |
1175 | static int |
1176 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1177 | struct dentry *dentry) | |
1178 | { | |
1179 | int retval; | |
bd238fb4 | 1180 | struct p9_fid *oldfid; |
531b1094 LI |
1181 | char *name; |
1182 | ||
bd238fb4 LI |
1183 | P9_DPRINTK(P9_DEBUG_VFS, |
1184 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1185 | old_dentry->d_name.name); |
1186 | ||
da977b2c | 1187 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1188 | if (IS_ERR(oldfid)) |
da977b2c | 1189 | return PTR_ERR(oldfid); |
531b1094 LI |
1190 | |
1191 | name = __getname(); | |
da977b2c EVH |
1192 | if (unlikely(!name)) { |
1193 | retval = -ENOMEM; | |
1194 | goto clunk_fid; | |
1195 | } | |
0710d36a | 1196 | |
16cce6d2 | 1197 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1198 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1199 | __putname(name); |
2bad8471 | 1200 | |
da977b2c | 1201 | clunk_fid: |
bd238fb4 | 1202 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1203 | return retval; |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * v9fs_vfs_mknod - create a special file | |
1208 | * @dir: inode destination for new link | |
1209 | * @dentry: dentry for file | |
1210 | * @mode: mode for creation | |
ee443996 | 1211 | * @rdev: device associated with special file |
2bad8471 EVH |
1212 | * |
1213 | */ | |
1214 | ||
1215 | static int | |
1216 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1217 | { | |
531b1094 LI |
1218 | int retval; |
1219 | char *name; | |
2bad8471 | 1220 | |
bd238fb4 LI |
1221 | P9_DPRINTK(P9_DEBUG_VFS, |
1222 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1223 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1224 | ||
531b1094 LI |
1225 | if (!new_valid_dev(rdev)) |
1226 | return -EINVAL; | |
2bad8471 | 1227 | |
531b1094 | 1228 | name = __getname(); |
c0291a05 ET |
1229 | if (!name) |
1230 | return -ENOMEM; | |
2bad8471 EVH |
1231 | /* build extension */ |
1232 | if (S_ISBLK(mode)) | |
531b1094 | 1233 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1234 | else if (S_ISCHR(mode)) |
531b1094 | 1235 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1236 | else if (S_ISFIFO(mode)) |
531b1094 | 1237 | *name = 0; |
75cc5c9b VJ |
1238 | else if (S_ISSOCK(mode)) |
1239 | *name = 0; | |
2bad8471 | 1240 | else { |
531b1094 LI |
1241 | __putname(name); |
1242 | return -EINVAL; | |
2bad8471 EVH |
1243 | } |
1244 | ||
531b1094 LI |
1245 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1246 | __putname(name); | |
2bad8471 EVH |
1247 | |
1248 | return retval; | |
1249 | } | |
1250 | ||
9b6533c9 SK |
1251 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1252 | .create = v9fs_vfs_create, | |
1253 | .lookup = v9fs_vfs_lookup, | |
1254 | .symlink = v9fs_vfs_symlink, | |
50cc42ff | 1255 | .link = v9fs_vfs_link, |
9b6533c9 SK |
1256 | .unlink = v9fs_vfs_unlink, |
1257 | .mkdir = v9fs_vfs_mkdir, | |
1258 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 1259 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
1260 | .rename = v9fs_vfs_rename, |
1261 | .getattr = v9fs_vfs_getattr, | |
1262 | .setattr = v9fs_vfs_setattr, | |
1263 | }; | |
1264 | ||
754661f1 | 1265 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1266 | .create = v9fs_vfs_create, |
1267 | .lookup = v9fs_vfs_lookup, | |
1268 | .unlink = v9fs_vfs_unlink, | |
1269 | .mkdir = v9fs_vfs_mkdir, | |
1270 | .rmdir = v9fs_vfs_rmdir, | |
1271 | .mknod = v9fs_vfs_mknod, | |
1272 | .rename = v9fs_vfs_rename, | |
1273 | .getattr = v9fs_vfs_getattr, | |
1274 | .setattr = v9fs_vfs_setattr, | |
1275 | }; | |
1276 | ||
754661f1 | 1277 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1278 | .getattr = v9fs_vfs_getattr, |
1279 | .setattr = v9fs_vfs_setattr, | |
1280 | }; | |
1281 | ||
754661f1 | 1282 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1283 | .readlink = generic_readlink, |
2bad8471 EVH |
1284 | .follow_link = v9fs_vfs_follow_link, |
1285 | .put_link = v9fs_vfs_put_link, | |
1286 | .getattr = v9fs_vfs_getattr, | |
1287 | .setattr = v9fs_vfs_setattr, | |
1288 | }; | |
9b6533c9 | 1289 |