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 | /** |
207 | * v9fs_alloc_inode - helper function to allocate an inode | |
60e78d2c AK |
208 | * |
209 | */ | |
60e78d2c AK |
210 | struct inode *v9fs_alloc_inode(struct super_block *sb) |
211 | { | |
a78ce05d AK |
212 | struct v9fs_inode *v9inode; |
213 | v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, | |
214 | GFP_KERNEL); | |
215 | if (!v9inode) | |
60e78d2c | 216 | return NULL; |
a78ce05d AK |
217 | #ifdef CONFIG_9P_FSCACHE |
218 | v9inode->fscache = NULL; | |
a78ce05d AK |
219 | spin_lock_init(&v9inode->fscache_lock); |
220 | #endif | |
6b39f6d2 | 221 | v9inode->writeback_fid = NULL; |
b3cbea03 | 222 | v9inode->cache_validity = 0; |
5a7e0a8c | 223 | mutex_init(&v9inode->v_mutex); |
a78ce05d | 224 | return &v9inode->vfs_inode; |
60e78d2c AK |
225 | } |
226 | ||
227 | /** | |
228 | * v9fs_destroy_inode - destroy an inode | |
229 | * | |
230 | */ | |
231 | ||
fa0d7e3d | 232 | static void v9fs_i_callback(struct rcu_head *head) |
60e78d2c | 233 | { |
fa0d7e3d NP |
234 | struct inode *inode = container_of(head, struct inode, i_rcu); |
235 | INIT_LIST_HEAD(&inode->i_dentry); | |
a78ce05d | 236 | kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); |
60e78d2c | 237 | } |
fa0d7e3d NP |
238 | |
239 | void v9fs_destroy_inode(struct inode *inode) | |
240 | { | |
241 | call_rcu(&inode->i_rcu, v9fs_i_callback); | |
242 | } | |
60e78d2c | 243 | |
5ffc0cb3 AK |
244 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
245 | struct inode *inode, int mode) | |
2bad8471 | 246 | { |
5ffc0cb3 | 247 | int err = 0; |
2bb54115 | 248 | |
217f206d | 249 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
250 | inode->i_blocks = 0; |
251 | inode->i_rdev = 0; | |
252 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
253 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
254 | ||
255 | switch (mode & S_IFMT) { | |
256 | case S_IFIFO: | |
257 | case S_IFBLK: | |
258 | case S_IFCHR: | |
259 | case S_IFSOCK: | |
4b43516a MK |
260 | if (v9fs_proto_dotl(v9ses)) { |
261 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
262 | inode->i_fop = &v9fs_file_operations_dotl; | |
263 | } else if (v9fs_proto_dotu(v9ses)) { | |
264 | inode->i_op = &v9fs_file_inode_operations; | |
265 | inode->i_fop = &v9fs_file_operations; | |
266 | } else { | |
bd238fb4 | 267 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
268 | "special files without extended mode\n"); |
269 | err = -EINVAL; | |
270 | goto error; | |
2bad8471 | 271 | } |
2bb54115 AK |
272 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
273 | break; | |
274 | case S_IFREG: | |
9b6533c9 SK |
275 | if (v9fs_proto_dotl(v9ses)) { |
276 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
29236f4e AK |
277 | if (v9ses->cache) |
278 | inode->i_fop = | |
279 | &v9fs_cached_file_operations_dotl; | |
280 | else | |
281 | inode->i_fop = &v9fs_file_operations_dotl; | |
9b6533c9 SK |
282 | } else { |
283 | inode->i_op = &v9fs_file_inode_operations; | |
29236f4e AK |
284 | if (v9ses->cache) |
285 | inode->i_fop = &v9fs_cached_file_operations; | |
286 | else | |
287 | inode->i_fop = &v9fs_file_operations; | |
9b6533c9 SK |
288 | } |
289 | ||
2bb54115 AK |
290 | break; |
291 | case S_IFLNK: | |
9b6533c9 SK |
292 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
293 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
294 | "legacy protocol.\n"); | |
2bb54115 AK |
295 | err = -EINVAL; |
296 | goto error; | |
297 | } | |
9b6533c9 SK |
298 | |
299 | if (v9fs_proto_dotl(v9ses)) | |
300 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
301 | else | |
302 | inode->i_op = &v9fs_symlink_inode_operations; | |
303 | ||
2bb54115 AK |
304 | break; |
305 | case S_IFDIR: | |
306 | inc_nlink(inode); | |
9b6533c9 SK |
307 | if (v9fs_proto_dotl(v9ses)) |
308 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
309 | else if (v9fs_proto_dotu(v9ses)) | |
310 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
311 | else |
312 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
313 | |
314 | if (v9fs_proto_dotl(v9ses)) | |
315 | inode->i_fop = &v9fs_dir_operations_dotl; | |
316 | else | |
317 | inode->i_fop = &v9fs_dir_operations; | |
318 | ||
2bb54115 AK |
319 | break; |
320 | default: | |
321 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
322 | mode, mode & S_IFMT); | |
323 | err = -EINVAL; | |
324 | goto error; | |
2bad8471 | 325 | } |
5ffc0cb3 AK |
326 | error: |
327 | return err; | |
2bb54115 | 328 | |
5ffc0cb3 | 329 | } |
2bb54115 | 330 | |
5ffc0cb3 AK |
331 | /** |
332 | * v9fs_get_inode - helper function to setup an inode | |
333 | * @sb: superblock | |
334 | * @mode: mode to setup inode with | |
335 | * | |
336 | */ | |
337 | ||
338 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
339 | { | |
340 | int err; | |
341 | struct inode *inode; | |
342 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
343 | ||
344 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
345 | ||
346 | inode = new_inode(sb); | |
347 | if (!inode) { | |
348 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
349 | return ERR_PTR(-ENOMEM); | |
350 | } | |
351 | err = v9fs_init_inode(v9ses, inode, mode); | |
352 | if (err) { | |
353 | iput(inode); | |
354 | return ERR_PTR(err); | |
355 | } | |
356 | return inode; | |
2bad8471 EVH |
357 | } |
358 | ||
bd238fb4 | 359 | /* |
6a3124a3 LI |
360 | static struct v9fs_fid* |
361 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
362 | { | |
363 | int err; | |
736c4b85 | 364 | int nfid; |
6a3124a3 LI |
365 | struct v9fs_fid *ret; |
366 | struct v9fs_fcall *fcall; | |
367 | ||
368 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
369 | if (nfid < 0) { | |
0b8dd177 | 370 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 371 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
372 | } |
373 | ||
6a3124a3 LI |
374 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
375 | &fcall); | |
376 | ||
377 | if (err < 0) { | |
41e5a6ac LI |
378 | if (fcall && fcall->id == RWALK) |
379 | goto clunk_fid; | |
380 | ||
6a3124a3 LI |
381 | PRINT_FCALL_ERROR("walk error", fcall); |
382 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
383 | goto error; | |
0b8dd177 | 384 | } |
6a3124a3 | 385 | |
3cf6429a LI |
386 | kfree(fcall); |
387 | fcall = NULL; | |
6a3124a3 LI |
388 | ret = v9fs_fid_create(v9ses, nfid); |
389 | if (!ret) { | |
390 | err = -ENOMEM; | |
391 | goto clunk_fid; | |
392 | } | |
0b8dd177 | 393 | |
6a3124a3 LI |
394 | err = v9fs_fid_insert(ret, dentry); |
395 | if (err < 0) { | |
396 | v9fs_fid_destroy(ret); | |
397 | goto clunk_fid; | |
0b8dd177 | 398 | } |
2bad8471 | 399 | |
6a3124a3 | 400 | return ret; |
2bad8471 | 401 | |
6a3124a3 LI |
402 | clunk_fid: |
403 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 404 | |
6a3124a3 LI |
405 | error: |
406 | kfree(fcall); | |
407 | return ERR_PTR(err); | |
408 | } | |
bd238fb4 | 409 | */ |
2bad8471 | 410 | |
60e78d2c AK |
411 | |
412 | /** | |
413 | * v9fs_clear_inode - release an inode | |
414 | * @inode: inode to release | |
415 | * | |
416 | */ | |
b57922d9 | 417 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 418 | { |
6b39f6d2 AK |
419 | struct v9fs_inode *v9inode = V9FS_I(inode); |
420 | ||
b57922d9 AV |
421 | truncate_inode_pages(inode->i_mapping, 0); |
422 | end_writeback(inode); | |
60e78d2c AK |
423 | filemap_fdatawrite(inode->i_mapping); |
424 | ||
425 | #ifdef CONFIG_9P_FSCACHE | |
426 | v9fs_cache_inode_put_cookie(inode); | |
427 | #endif | |
6b39f6d2 AK |
428 | /* clunk the fid stashed in writeback_fid */ |
429 | if (v9inode->writeback_fid) { | |
430 | p9_client_clunk(v9inode->writeback_fid); | |
431 | v9inode->writeback_fid = NULL; | |
3cf387d7 | 432 | } |
60e78d2c AK |
433 | } |
434 | ||
fd2421f5 AK |
435 | static int v9fs_test_inode(struct inode *inode, void *data) |
436 | { | |
437 | int umode; | |
438 | struct v9fs_inode *v9inode = V9FS_I(inode); | |
439 | struct p9_wstat *st = (struct p9_wstat *)data; | |
440 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
441 | ||
442 | umode = p9mode2unixmode(v9ses, st->mode); | |
443 | /* don't match inode of different type */ | |
444 | if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) | |
445 | return 0; | |
446 | ||
447 | /* compare qid details */ | |
448 | if (memcmp(&v9inode->qid.version, | |
449 | &st->qid.version, sizeof(v9inode->qid.version))) | |
450 | return 0; | |
451 | ||
452 | if (v9inode->qid.type != st->qid.type) | |
453 | return 0; | |
454 | return 1; | |
455 | } | |
456 | ||
ed80fcfa AK |
457 | static int v9fs_test_new_inode(struct inode *inode, void *data) |
458 | { | |
459 | return 0; | |
460 | } | |
461 | ||
fd2421f5 AK |
462 | static int v9fs_set_inode(struct inode *inode, void *data) |
463 | { | |
464 | struct v9fs_inode *v9inode = V9FS_I(inode); | |
465 | struct p9_wstat *st = (struct p9_wstat *)data; | |
466 | ||
467 | memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); | |
468 | return 0; | |
469 | } | |
470 | ||
5ffc0cb3 AK |
471 | static struct inode *v9fs_qid_iget(struct super_block *sb, |
472 | struct p9_qid *qid, | |
ed80fcfa AK |
473 | struct p9_wstat *st, |
474 | int new) | |
6a3124a3 | 475 | { |
5ffc0cb3 AK |
476 | int retval, umode; |
477 | unsigned long i_ino; | |
478 | struct inode *inode; | |
479 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
ed80fcfa AK |
480 | int (*test)(struct inode *, void *); |
481 | ||
482 | if (new) | |
483 | test = v9fs_test_new_inode; | |
484 | else | |
485 | test = v9fs_test_inode; | |
2bad8471 | 486 | |
5ffc0cb3 | 487 | i_ino = v9fs_qid2ino(qid); |
ed80fcfa | 488 | inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); |
5ffc0cb3 AK |
489 | if (!inode) |
490 | return ERR_PTR(-ENOMEM); | |
491 | if (!(inode->i_state & I_NEW)) | |
492 | return inode; | |
493 | /* | |
494 | * initialize the inode with the stat info | |
495 | * FIXME!! we may need support for stale inodes | |
496 | * later. | |
497 | */ | |
fd2421f5 | 498 | inode->i_ino = i_ino; |
bd238fb4 | 499 | umode = p9mode2unixmode(v9ses, st->mode); |
5ffc0cb3 AK |
500 | retval = v9fs_init_inode(v9ses, inode, umode); |
501 | if (retval) | |
6a3124a3 | 502 | goto error; |
60e78d2c | 503 | |
5ffc0cb3 | 504 | v9fs_stat2inode(st, inode, sb); |
60e78d2c | 505 | #ifdef CONFIG_9P_FSCACHE |
5ffc0cb3 | 506 | v9fs_cache_inode_get_cookie(inode); |
60e78d2c | 507 | #endif |
5ffc0cb3 AK |
508 | unlock_new_inode(inode); |
509 | return inode; | |
6a3124a3 | 510 | error: |
5ffc0cb3 AK |
511 | unlock_new_inode(inode); |
512 | iput(inode); | |
513 | return ERR_PTR(retval); | |
514 | ||
515 | } | |
516 | ||
517 | struct inode * | |
a78ce05d | 518 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
ed80fcfa | 519 | struct super_block *sb, int new) |
5ffc0cb3 AK |
520 | { |
521 | struct p9_wstat *st; | |
522 | struct inode *inode = NULL; | |
523 | ||
524 | st = p9_client_stat(fid); | |
525 | if (IS_ERR(st)) | |
526 | return ERR_CAST(st); | |
527 | ||
ed80fcfa | 528 | inode = v9fs_qid_iget(sb, &st->qid, st, new); |
02bc3567 | 529 | p9stat_free(st); |
bd238fb4 | 530 | kfree(st); |
5ffc0cb3 | 531 | return inode; |
2bad8471 EVH |
532 | } |
533 | ||
534 | /** | |
535 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
536 | * @dir: directory inode that is being deleted |
537 | * @file: dentry that is being deleted | |
538 | * @rmdir: removing a directory | |
2bad8471 EVH |
539 | * |
540 | */ | |
541 | ||
542 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
543 | { | |
d994f405 | 544 | int retval; |
bd238fb4 | 545 | struct p9_fid *v9fid; |
d28c61f0 | 546 | struct inode *file_inode; |
2bad8471 | 547 | |
bd238fb4 | 548 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
549 | rmdir); |
550 | ||
551 | file_inode = file->d_inode; | |
c959df9f | 552 | v9fid = v9fs_fid_clone(file); |
ba17674f | 553 | if (IS_ERR(v9fid)) |
da977b2c | 554 | return PTR_ERR(v9fid); |
2bad8471 | 555 | |
d994f405 | 556 | retval = p9_client_remove(v9fid); |
b271ec47 AK |
557 | if (!retval) { |
558 | /* | |
559 | * directories on unlink should have zero | |
560 | * link count | |
561 | */ | |
562 | if (rmdir) { | |
563 | clear_nlink(file_inode); | |
564 | drop_nlink(dir); | |
565 | } else | |
566 | drop_nlink(file_inode); | |
d28c61f0 | 567 | |
3bc86de3 | 568 | v9fs_invalidate_inode_attr(file_inode); |
d28c61f0 | 569 | v9fs_invalidate_inode_attr(dir); |
b271ec47 | 570 | } |
d994f405 | 571 | return retval; |
2bad8471 EVH |
572 | } |
573 | ||
574 | /** | |
bd238fb4 | 575 | * v9fs_create - Create a file |
ee443996 EVH |
576 | * @v9ses: session information |
577 | * @dir: directory that dentry is being created in | |
bd238fb4 | 578 | * @dentry: dentry that is being created |
0e15597e | 579 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
580 | * @perm: create permissions |
581 | * @mode: open mode | |
2bad8471 EVH |
582 | * |
583 | */ | |
bd238fb4 LI |
584 | static struct p9_fid * |
585 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
586 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 587 | { |
6a3124a3 | 588 | int err; |
bd238fb4 LI |
589 | char *name; |
590 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 591 | struct inode *inode; |
6a3124a3 | 592 | |
51a87c55 EVH |
593 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
594 | ||
bd238fb4 LI |
595 | err = 0; |
596 | ofid = NULL; | |
597 | fid = NULL; | |
598 | name = (char *) dentry->d_name.name; | |
6d27e64d | 599 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 600 | if (IS_ERR(dfid)) { |
da977b2c | 601 | err = PTR_ERR(dfid); |
6d27e64d VJ |
602 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
603 | return ERR_PTR(err); | |
da977b2c | 604 | } |
6a3124a3 | 605 | |
bd238fb4 LI |
606 | /* clone a fid to use for creation */ |
607 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
608 | if (IS_ERR(ofid)) { | |
609 | err = PTR_ERR(ofid); | |
51a87c55 | 610 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 611 | return ERR_PTR(err); |
bd238fb4 | 612 | } |
6a3124a3 | 613 | |
bd238fb4 | 614 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
615 | if (err < 0) { |
616 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 617 | goto error; |
51a87c55 | 618 | } |
6a3124a3 | 619 | |
bd238fb4 | 620 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 621 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
622 | if (IS_ERR(fid)) { |
623 | err = PTR_ERR(fid); | |
51a87c55 | 624 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 625 | fid = NULL; |
6a3124a3 | 626 | goto error; |
6d27e64d | 627 | } |
6a3124a3 | 628 | |
bd238fb4 | 629 | /* instantiate inode and assign the unopened fid to the dentry */ |
ed80fcfa | 630 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
6a3124a3 LI |
631 | if (IS_ERR(inode)) { |
632 | err = PTR_ERR(inode); | |
51a87c55 | 633 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
634 | goto error; |
635 | } | |
6a3124a3 | 636 | d_instantiate(dentry, inode); |
50fb6d2b AK |
637 | err = v9fs_fid_add(dentry, fid); |
638 | if (err < 0) | |
639 | goto error; | |
640 | ||
bd238fb4 | 641 | return ofid; |
6a3124a3 | 642 | |
bd238fb4 | 643 | error: |
bd238fb4 LI |
644 | if (ofid) |
645 | p9_client_clunk(ofid); | |
646 | ||
647 | if (fid) | |
648 | p9_client_clunk(fid); | |
649 | ||
650 | return ERR_PTR(err); | |
651 | } | |
652 | ||
653 | /** | |
654 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 655 | * @dir: directory inode that is being created |
bd238fb4 LI |
656 | * @dentry: dentry that is being deleted |
657 | * @mode: create permissions | |
658 | * @nd: path information | |
659 | * | |
660 | */ | |
6a3124a3 | 661 | |
bd238fb4 LI |
662 | static int |
663 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
664 | struct nameidata *nd) | |
665 | { | |
666 | int err; | |
667 | u32 perm; | |
668 | int flags; | |
6b39f6d2 AK |
669 | struct file *filp; |
670 | struct v9fs_inode *v9inode; | |
bd238fb4 | 671 | struct v9fs_session_info *v9ses; |
3cf387d7 | 672 | struct p9_fid *fid, *inode_fid; |
bd238fb4 LI |
673 | |
674 | err = 0; | |
675 | fid = NULL; | |
676 | v9ses = v9fs_inode2v9ses(dir); | |
677 | perm = unixmode2p9mode(v9ses, mode); | |
dd7dd556 | 678 | if (nd) |
8a5e929d | 679 | flags = nd->intent.open.flags; |
bd238fb4 LI |
680 | else |
681 | flags = O_RDWR; | |
682 | ||
683 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
684 | v9fs_uflags2omode(flags, |
685 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
686 | if (IS_ERR(fid)) { |
687 | err = PTR_ERR(fid); | |
688 | fid = NULL; | |
689 | goto error; | |
690 | } | |
691 | ||
d28c61f0 | 692 | v9fs_invalidate_inode_attr(dir); |
bd238fb4 | 693 | /* if we are opening a file, assign the open fid to the file */ |
dd7dd556 | 694 | if (nd) { |
6b39f6d2 | 695 | v9inode = V9FS_I(dentry->d_inode); |
5a7e0a8c | 696 | mutex_lock(&v9inode->v_mutex); |
7add697a AK |
697 | if (v9ses->cache && !v9inode->writeback_fid && |
698 | ((flags & O_ACCMODE) != O_RDONLY)) { | |
3cf387d7 | 699 | /* |
6b39f6d2 | 700 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
701 | * we do it during open time instead of |
702 | * page dirty time via write_begin/page_mkwrite | |
703 | * because we want write after unlink usecase | |
704 | * to work. | |
705 | */ | |
706 | inode_fid = v9fs_writeback_fid(dentry); | |
707 | if (IS_ERR(inode_fid)) { | |
708 | err = PTR_ERR(inode_fid); | |
5a7e0a8c | 709 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
710 | goto error; |
711 | } | |
6b39f6d2 | 712 | v9inode->writeback_fid = (void *) inode_fid; |
3cf387d7 | 713 | } |
5a7e0a8c | 714 | mutex_unlock(&v9inode->v_mutex); |
877cb3d4 | 715 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
6a3124a3 | 716 | if (IS_ERR(filp)) { |
bd238fb4 LI |
717 | err = PTR_ERR(filp); |
718 | goto error; | |
6a3124a3 LI |
719 | } |
720 | ||
bd238fb4 | 721 | filp->private_data = fid; |
46848de0 AK |
722 | #ifdef CONFIG_9P_FSCACHE |
723 | if (v9ses->cache) | |
724 | v9fs_cache_inode_set_cookie(dentry->d_inode, filp); | |
725 | #endif | |
bd238fb4 LI |
726 | } else |
727 | p9_client_clunk(fid); | |
6a3124a3 LI |
728 | |
729 | return 0; | |
730 | ||
731 | error: | |
bd238fb4 LI |
732 | if (fid) |
733 | p9_client_clunk(fid); | |
6a3124a3 | 734 | |
6a3124a3 | 735 | return err; |
2bad8471 EVH |
736 | } |
737 | ||
738 | /** | |
739 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 740 | * @dir: inode that is being unlinked |
2bad8471 EVH |
741 | * @dentry: dentry that is being unlinked |
742 | * @mode: mode for new directory | |
743 | * | |
744 | */ | |
745 | ||
6a3124a3 | 746 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 747 | { |
6a3124a3 | 748 | int err; |
bd238fb4 | 749 | u32 perm; |
bd238fb4 | 750 | struct p9_fid *fid; |
d28c61f0 | 751 | struct v9fs_session_info *v9ses; |
6a3124a3 | 752 | |
bd238fb4 LI |
753 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
754 | err = 0; | |
6a3124a3 | 755 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 756 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
757 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
758 | if (IS_ERR(fid)) { | |
759 | err = PTR_ERR(fid); | |
760 | fid = NULL; | |
d28c61f0 | 761 | } else { |
b271ec47 | 762 | inc_nlink(dir); |
d28c61f0 AK |
763 | v9fs_invalidate_inode_attr(dir); |
764 | } | |
6a3124a3 | 765 | |
bd238fb4 LI |
766 | if (fid) |
767 | p9_client_clunk(fid); | |
6a3124a3 | 768 | |
6a3124a3 | 769 | return err; |
2bad8471 EVH |
770 | } |
771 | ||
772 | /** | |
773 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
774 | * @dir: inode that is being walked from | |
775 | * @dentry: dentry that is being walked to? | |
776 | * @nameidata: path data | |
777 | * | |
778 | */ | |
779 | ||
53c06f4e | 780 | struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
2bad8471 EVH |
781 | struct nameidata *nameidata) |
782 | { | |
783 | struct super_block *sb; | |
784 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 785 | struct p9_fid *dfid, *fid; |
2bad8471 | 786 | struct inode *inode; |
bd238fb4 | 787 | char *name; |
2bad8471 EVH |
788 | int result = 0; |
789 | ||
bd238fb4 | 790 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 791 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 792 | |
11e9b49b SK |
793 | if (dentry->d_name.len > NAME_MAX) |
794 | return ERR_PTR(-ENAMETOOLONG); | |
795 | ||
2bad8471 EVH |
796 | sb = dir->i_sb; |
797 | v9ses = v9fs_inode2v9ses(dir); | |
a534c8d1 | 798 | /* We can walk d_parent because we hold the dir->i_mutex */ |
bd238fb4 LI |
799 | dfid = v9fs_fid_lookup(dentry->d_parent); |
800 | if (IS_ERR(dfid)) | |
e231c2ee | 801 | return ERR_CAST(dfid); |
bd238fb4 LI |
802 | |
803 | name = (char *) dentry->d_name.name; | |
804 | fid = p9_client_walk(dfid, 1, &name, 1); | |
805 | if (IS_ERR(fid)) { | |
806 | result = PTR_ERR(fid); | |
2bad8471 | 807 | if (result == -ENOENT) { |
85e0df24 AK |
808 | inode = NULL; |
809 | goto inst_out; | |
2bad8471 | 810 | } |
2bad8471 | 811 | |
bd238fb4 | 812 | return ERR_PTR(result); |
2bad8471 EVH |
813 | } |
814 | ||
a78ce05d | 815 | inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
bd238fb4 LI |
816 | if (IS_ERR(inode)) { |
817 | result = PTR_ERR(inode); | |
818 | inode = NULL; | |
819 | goto error; | |
2bad8471 EVH |
820 | } |
821 | ||
bd238fb4 | 822 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 823 | if (result < 0) |
9856af8b | 824 | goto error_iput; |
6a3124a3 | 825 | |
85e0df24 | 826 | inst_out: |
2bad8471 | 827 | d_add(dentry, inode); |
2bad8471 EVH |
828 | return NULL; |
829 | ||
9856af8b AK |
830 | error_iput: |
831 | iput(inode); | |
bd238fb4 | 832 | error: |
62aa528e | 833 | p9_client_clunk(fid); |
da977b2c | 834 | |
2bad8471 EVH |
835 | return ERR_PTR(result); |
836 | } | |
837 | ||
838 | /** | |
839 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
840 | * @i: inode that is being unlinked | |
73c592b9 | 841 | * @d: dentry that is being unlinked |
2bad8471 EVH |
842 | * |
843 | */ | |
844 | ||
53c06f4e | 845 | int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
2bad8471 EVH |
846 | { |
847 | return v9fs_remove(i, d, 0); | |
848 | } | |
849 | ||
850 | /** | |
851 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
852 | * @i: inode that is being unlinked | |
73c592b9 | 853 | * @d: dentry that is being unlinked |
2bad8471 EVH |
854 | * |
855 | */ | |
856 | ||
53c06f4e | 857 | int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
2bad8471 EVH |
858 | { |
859 | return v9fs_remove(i, d, 1); | |
860 | } | |
861 | ||
862 | /** | |
863 | * v9fs_vfs_rename - VFS hook to rename an inode | |
864 | * @old_dir: old dir inode | |
865 | * @old_dentry: old dentry | |
866 | * @new_dir: new dir inode | |
867 | * @new_dentry: new dentry | |
868 | * | |
869 | */ | |
870 | ||
53c06f4e | 871 | int |
2bad8471 EVH |
872 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
873 | struct inode *new_dir, struct dentry *new_dentry) | |
874 | { | |
d28c61f0 | 875 | int retval; |
bd238fb4 | 876 | struct inode *old_inode; |
b271ec47 | 877 | struct inode *new_inode; |
bd238fb4 LI |
878 | struct v9fs_session_info *v9ses; |
879 | struct p9_fid *oldfid; | |
880 | struct p9_fid *olddirfid; | |
881 | struct p9_fid *newdirfid; | |
882 | struct p9_wstat wstat; | |
2bad8471 | 883 | |
bd238fb4 LI |
884 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
885 | retval = 0; | |
886 | old_inode = old_dentry->d_inode; | |
b271ec47 | 887 | new_inode = new_dentry->d_inode; |
bd238fb4 LI |
888 | v9ses = v9fs_inode2v9ses(old_inode); |
889 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 890 | if (IS_ERR(oldfid)) |
da977b2c EVH |
891 | return PTR_ERR(oldfid); |
892 | ||
893 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 894 | if (IS_ERR(olddirfid)) { |
da977b2c | 895 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 896 | goto done; |
da977b2c EVH |
897 | } |
898 | ||
899 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 900 | if (IS_ERR(newdirfid)) { |
da977b2c | 901 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 902 | goto clunk_olddir; |
2bad8471 EVH |
903 | } |
904 | ||
a534c8d1 | 905 | down_write(&v9ses->rename_sem); |
4681dbda | 906 | if (v9fs_proto_dotl(v9ses)) { |
9e8fb38e AK |
907 | retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, |
908 | newdirfid, new_dentry->d_name.name); | |
909 | if (retval == -EOPNOTSUPP) | |
910 | retval = p9_client_rename(oldfid, newdirfid, | |
911 | new_dentry->d_name.name); | |
912 | if (retval != -EOPNOTSUPP) | |
4681dbda SK |
913 | goto clunk_newdir; |
914 | } | |
a534c8d1 AK |
915 | if (old_dentry->d_parent != new_dentry->d_parent) { |
916 | /* | |
917 | * 9P .u can only handle file rename in the same directory | |
918 | */ | |
4681dbda | 919 | |
bd238fb4 LI |
920 | P9_DPRINTK(P9_DEBUG_ERROR, |
921 | "old dir and new dir are different\n"); | |
621997cd | 922 | retval = -EXDEV; |
bd238fb4 | 923 | goto clunk_newdir; |
2bad8471 | 924 | } |
531b1094 | 925 | v9fs_blank_wstat(&wstat); |
ba17674f | 926 | wstat.muid = v9ses->uname; |
531b1094 | 927 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 928 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 929 | |
bd238fb4 | 930 | clunk_newdir: |
b271ec47 AK |
931 | if (!retval) { |
932 | if (new_inode) { | |
933 | if (S_ISDIR(new_inode->i_mode)) | |
934 | clear_nlink(new_inode); | |
935 | else | |
936 | drop_nlink(new_inode); | |
937 | } | |
938 | if (S_ISDIR(old_inode->i_mode)) { | |
939 | if (!new_inode) | |
940 | inc_nlink(new_dir); | |
941 | drop_nlink(old_dir); | |
942 | } | |
3bc86de3 | 943 | v9fs_invalidate_inode_attr(old_inode); |
d28c61f0 AK |
944 | v9fs_invalidate_inode_attr(old_dir); |
945 | v9fs_invalidate_inode_attr(new_dir); | |
3bc86de3 | 946 | |
a534c8d1 AK |
947 | /* successful rename */ |
948 | d_move(old_dentry, new_dentry); | |
b271ec47 | 949 | } |
a534c8d1 | 950 | up_write(&v9ses->rename_sem); |
22150c4f | 951 | p9_client_clunk(newdirfid); |
2bad8471 | 952 | |
bd238fb4 | 953 | clunk_olddir: |
22150c4f | 954 | p9_client_clunk(olddirfid); |
da977b2c | 955 | |
bd238fb4 | 956 | done: |
2bad8471 EVH |
957 | return retval; |
958 | } | |
959 | ||
960 | /** | |
943ffb58 | 961 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
962 | * @mnt: mount information |
963 | * @dentry: file to get attributes on | |
964 | * @stat: metadata structure to populate | |
2bad8471 EVH |
965 | * |
966 | */ | |
967 | ||
968 | static int | |
969 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
970 | struct kstat *stat) | |
971 | { | |
bd238fb4 LI |
972 | int err; |
973 | struct v9fs_session_info *v9ses; | |
974 | struct p9_fid *fid; | |
51a87c55 | 975 | struct p9_wstat *st; |
bd238fb4 LI |
976 | |
977 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
978 | err = -EPERM; | |
42869c8a | 979 | v9ses = v9fs_dentry2v9ses(dentry); |
a1211908 AK |
980 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
981 | generic_fillattr(dentry->d_inode, stat); | |
982 | return 0; | |
983 | } | |
bd238fb4 LI |
984 | fid = v9fs_fid_lookup(dentry); |
985 | if (IS_ERR(fid)) | |
da977b2c | 986 | return PTR_ERR(fid); |
2bad8471 | 987 | |
bd238fb4 LI |
988 | st = p9_client_stat(fid); |
989 | if (IS_ERR(st)) | |
990 | return PTR_ERR(st); | |
2bad8471 | 991 | |
bd238fb4 | 992 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 993 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 994 | |
62b2be59 | 995 | p9stat_free(st); |
bd238fb4 LI |
996 | kfree(st); |
997 | return 0; | |
2bad8471 EVH |
998 | } |
999 | ||
1000 | /** | |
1001 | * v9fs_vfs_setattr - set file metadata | |
1002 | * @dentry: file whose metadata to set | |
1003 | * @iattr: metadata assignment structure | |
1004 | * | |
1005 | */ | |
1006 | ||
1007 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
1008 | { | |
bd238fb4 LI |
1009 | int retval; |
1010 | struct v9fs_session_info *v9ses; | |
1011 | struct p9_fid *fid; | |
1012 | struct p9_wstat wstat; | |
2bad8471 | 1013 | |
bd238fb4 | 1014 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
059c138b AK |
1015 | retval = inode_change_ok(dentry->d_inode, iattr); |
1016 | if (retval) | |
1017 | return retval; | |
1018 | ||
bd238fb4 | 1019 | retval = -EPERM; |
42869c8a | 1020 | v9ses = v9fs_dentry2v9ses(dentry); |
bd238fb4 | 1021 | fid = v9fs_fid_lookup(dentry); |
da977b2c EVH |
1022 | if(IS_ERR(fid)) |
1023 | return PTR_ERR(fid); | |
2bad8471 | 1024 | |
531b1094 | 1025 | v9fs_blank_wstat(&wstat); |
2bad8471 | 1026 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 1027 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
1028 | |
1029 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 1030 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
1031 | |
1032 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 1033 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
1034 | |
1035 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 1036 | wstat.length = iattr->ia_size; |
2bad8471 | 1037 | |
dd6102fb | 1038 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1039 | if (iattr->ia_valid & ATTR_UID) |
1040 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 1041 | |
531b1094 LI |
1042 | if (iattr->ia_valid & ATTR_GID) |
1043 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 | 1044 | } |
059c138b | 1045 | |
3dc5436a AK |
1046 | /* Write all dirty data */ |
1047 | if (S_ISREG(dentry->d_inode->i_mode)) | |
1048 | filemap_write_and_wait(dentry->d_inode->i_mapping); | |
1049 | ||
f10fc50f AK |
1050 | retval = p9_client_wstat(fid, &wstat); |
1051 | if (retval < 0) | |
1052 | return retval; | |
059c138b AK |
1053 | |
1054 | if ((iattr->ia_valid & ATTR_SIZE) && | |
1055 | iattr->ia_size != i_size_read(dentry->d_inode)) | |
1056 | truncate_setsize(dentry->d_inode, iattr->ia_size); | |
1057 | ||
f10fc50f | 1058 | v9fs_invalidate_inode_attr(dentry->d_inode); |
2bad8471 | 1059 | |
1025774c CH |
1060 | setattr_copy(dentry->d_inode, iattr); |
1061 | mark_inode_dirty(dentry->d_inode); | |
1062 | return 0; | |
2bad8471 EVH |
1063 | } |
1064 | ||
1065 | /** | |
531b1094 LI |
1066 | * v9fs_stat2inode - populate an inode structure with mistat info |
1067 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
1068 | * @inode: inode to populate |
1069 | * @sb: superblock of filesystem | |
1070 | * | |
1071 | */ | |
1072 | ||
1073 | void | |
51a87c55 | 1074 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 1075 | struct super_block *sb) |
2bad8471 | 1076 | { |
531b1094 | 1077 | char ext[32]; |
5717144a AK |
1078 | char tag_name[14]; |
1079 | unsigned int i_nlink; | |
2bad8471 | 1080 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
b3cbea03 | 1081 | struct v9fs_inode *v9inode = V9FS_I(inode); |
2bad8471 EVH |
1082 | |
1083 | inode->i_nlink = 1; | |
1084 | ||
531b1094 LI |
1085 | inode->i_atime.tv_sec = stat->atime; |
1086 | inode->i_mtime.tv_sec = stat->mtime; | |
1087 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 1088 | |
bd32b82d LI |
1089 | inode->i_uid = v9ses->dfltuid; |
1090 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 1091 | |
dd6102fb | 1092 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1093 | inode->i_uid = stat->n_uid; |
1094 | inode->i_gid = stat->n_gid; | |
2bad8471 | 1095 | } |
5717144a AK |
1096 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
1097 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
1098 | /* | |
1099 | * Hadlink support got added later to | |
1100 | * to the .u extension. So there can be | |
1101 | * server out there that doesn't support | |
1102 | * this even with .u extension. So check | |
1103 | * for non NULL stat->extension | |
1104 | */ | |
1105 | strncpy(ext, stat->extension, sizeof(ext)); | |
1106 | /* HARDLINKCOUNT %u */ | |
1107 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
1108 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
1109 | inode->i_nlink = i_nlink; | |
1110 | } | |
1111 | } | |
531b1094 | 1112 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
1113 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
1114 | char type = 0; | |
1115 | int major = -1; | |
1116 | int minor = -1; | |
531b1094 | 1117 | |
51a87c55 | 1118 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 1119 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
1120 | switch (type) { |
1121 | case 'c': | |
1122 | inode->i_mode &= ~S_IFBLK; | |
1123 | inode->i_mode |= S_IFCHR; | |
1124 | break; | |
1125 | case 'b': | |
1126 | break; | |
1127 | default: | |
bd238fb4 | 1128 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
1129 | "Unknown special type %c %s\n", type, |
1130 | stat->extension); | |
2bad8471 EVH |
1131 | }; |
1132 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 1133 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
1134 | } else |
1135 | inode->i_rdev = 0; | |
1136 | ||
7549ae3e | 1137 | i_size_write(inode, stat->length); |
2bad8471 | 1138 | |
bd238fb4 | 1139 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 1140 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
b3cbea03 | 1141 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
2bad8471 EVH |
1142 | } |
1143 | ||
1144 | /** | |
1145 | * v9fs_qid2ino - convert qid into inode number | |
1146 | * @qid: qid to hash | |
1147 | * | |
1148 | * BUG: potential for inode number collisions? | |
1149 | */ | |
1150 | ||
bd238fb4 | 1151 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
1152 | { |
1153 | u64 path = qid->path + 2; | |
1154 | ino_t i = 0; | |
1155 | ||
1156 | if (sizeof(ino_t) == sizeof(path)) | |
1157 | memcpy(&i, &path, sizeof(ino_t)); | |
1158 | else | |
1159 | i = (ino_t) (path ^ (path >> 32)); | |
1160 | ||
1161 | return i; | |
1162 | } | |
1163 | ||
2bad8471 EVH |
1164 | /** |
1165 | * v9fs_readlink - read a symlink's location (internal version) | |
1166 | * @dentry: dentry for symlink | |
73c592b9 | 1167 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1168 | * @buflen: length of buffer |
1169 | * | |
1170 | */ | |
1171 | ||
1172 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1173 | { | |
bd238fb4 | 1174 | int retval; |
2bad8471 | 1175 | |
bd238fb4 LI |
1176 | struct v9fs_session_info *v9ses; |
1177 | struct p9_fid *fid; | |
51a87c55 | 1178 | struct p9_wstat *st; |
2bad8471 | 1179 | |
bd238fb4 LI |
1180 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1181 | retval = -EPERM; | |
42869c8a | 1182 | v9ses = v9fs_dentry2v9ses(dentry); |
bd238fb4 | 1183 | fid = v9fs_fid_lookup(dentry); |
ba17674f | 1184 | if (IS_ERR(fid)) |
da977b2c | 1185 | return PTR_ERR(fid); |
2bad8471 | 1186 | |
329176cc | 1187 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1188 | return -EBADF; |
2bad8471 | 1189 | |
bd238fb4 LI |
1190 | st = p9_client_stat(fid); |
1191 | if (IS_ERR(st)) | |
1192 | return PTR_ERR(st); | |
2bad8471 | 1193 | |
bd238fb4 | 1194 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1195 | retval = -EINVAL; |
bd238fb4 | 1196 | goto done; |
2bad8471 EVH |
1197 | } |
1198 | ||
1199 | /* copy extension buffer into buffer */ | |
51a87c55 | 1200 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1201 | |
bd238fb4 | 1202 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1203 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1204 | |
2511cd0b | 1205 | retval = strnlen(buffer, buflen); |
bd238fb4 | 1206 | done: |
62b2be59 | 1207 | p9stat_free(st); |
bd238fb4 | 1208 | kfree(st); |
2bad8471 EVH |
1209 | return retval; |
1210 | } | |
1211 | ||
2bad8471 EVH |
1212 | /** |
1213 | * v9fs_vfs_follow_link - follow a symlink path | |
1214 | * @dentry: dentry for symlink | |
1215 | * @nd: nameidata | |
1216 | * | |
1217 | */ | |
1218 | ||
1219 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1220 | { | |
1221 | int len = 0; | |
1222 | char *link = __getname(); | |
1223 | ||
bd238fb4 | 1224 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1225 | |
1226 | if (!link) | |
1227 | link = ERR_PTR(-ENOMEM); | |
1228 | else { | |
16cce6d2 | 1229 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1230 | |
1231 | if (len < 0) { | |
ce44eeb6 | 1232 | __putname(link); |
2bad8471 EVH |
1233 | link = ERR_PTR(len); |
1234 | } else | |
2511cd0b | 1235 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1236 | } |
1237 | nd_set_link(nd, link); | |
1238 | ||
1239 | return NULL; | |
1240 | } | |
1241 | ||
1242 | /** | |
1243 | * v9fs_vfs_put_link - release a symlink path | |
1244 | * @dentry: dentry for symlink | |
1245 | * @nd: nameidata | |
ee443996 | 1246 | * @p: unused |
2bad8471 EVH |
1247 | * |
1248 | */ | |
1249 | ||
53c06f4e | 1250 | void |
ee443996 | 1251 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
2bad8471 EVH |
1252 | { |
1253 | char *s = nd_get_link(nd); | |
1254 | ||
6ff23207 DG |
1255 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1256 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1257 | if (!IS_ERR(s)) |
ce44eeb6 | 1258 | __putname(s); |
2bad8471 EVH |
1259 | } |
1260 | ||
ee443996 EVH |
1261 | /** |
1262 | * v9fs_vfs_mkspecial - create a special file | |
1263 | * @dir: inode to create special file in | |
1264 | * @dentry: dentry to create | |
1265 | * @mode: mode to create special file | |
1266 | * @extension: 9p2000.u format extension string representing special file | |
1267 | * | |
1268 | */ | |
1269 | ||
531b1094 LI |
1270 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1271 | int mode, const char *extension) | |
2bad8471 | 1272 | { |
bd238fb4 | 1273 | u32 perm; |
bd238fb4 | 1274 | struct p9_fid *fid; |
d28c61f0 | 1275 | struct v9fs_session_info *v9ses; |
2bad8471 | 1276 | |
6a3124a3 | 1277 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1278 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1279 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1280 | return -EPERM; |
2bad8471 EVH |
1281 | } |
1282 | ||
da977b2c | 1283 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1284 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1285 | P9_OREAD); | |
1286 | if (IS_ERR(fid)) | |
1287 | return PTR_ERR(fid); | |
da977b2c | 1288 | |
d28c61f0 | 1289 | v9fs_invalidate_inode_attr(dir); |
bd238fb4 | 1290 | p9_client_clunk(fid); |
6a3124a3 | 1291 | return 0; |
531b1094 LI |
1292 | } |
1293 | ||
1294 | /** | |
1295 | * v9fs_vfs_symlink - helper function to create symlinks | |
1296 | * @dir: directory inode containing symlink | |
1297 | * @dentry: dentry for symlink | |
1298 | * @symname: symlink data | |
1299 | * | |
ee443996 | 1300 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1301 | * |
1302 | */ | |
1303 | ||
1304 | static int | |
1305 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1306 | { | |
bd238fb4 LI |
1307 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1308 | dentry->d_name.name, symname); | |
531b1094 LI |
1309 | |
1310 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1311 | } | |
1312 | ||
1313 | /** | |
1314 | * v9fs_vfs_link - create a hardlink | |
1315 | * @old_dentry: dentry for file to link to | |
1316 | * @dir: inode destination for new link | |
1317 | * @dentry: dentry for link | |
1318 | * | |
1319 | */ | |
1320 | ||
531b1094 LI |
1321 | static int |
1322 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1323 | struct dentry *dentry) | |
1324 | { | |
1325 | int retval; | |
531b1094 | 1326 | char *name; |
d28c61f0 | 1327 | struct p9_fid *oldfid; |
531b1094 | 1328 | |
bd238fb4 LI |
1329 | P9_DPRINTK(P9_DEBUG_VFS, |
1330 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1331 | old_dentry->d_name.name); |
1332 | ||
da977b2c | 1333 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1334 | if (IS_ERR(oldfid)) |
da977b2c | 1335 | return PTR_ERR(oldfid); |
531b1094 LI |
1336 | |
1337 | name = __getname(); | |
da977b2c EVH |
1338 | if (unlikely(!name)) { |
1339 | retval = -ENOMEM; | |
1340 | goto clunk_fid; | |
1341 | } | |
0710d36a | 1342 | |
16cce6d2 | 1343 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1344 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1345 | __putname(name); |
c06c066a AK |
1346 | if (!retval) { |
1347 | v9fs_refresh_inode(oldfid, old_dentry->d_inode); | |
d28c61f0 | 1348 | v9fs_invalidate_inode_attr(dir); |
c06c066a | 1349 | } |
da977b2c | 1350 | clunk_fid: |
bd238fb4 | 1351 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1352 | return retval; |
1353 | } | |
1354 | ||
1355 | /** | |
1356 | * v9fs_vfs_mknod - create a special file | |
1357 | * @dir: inode destination for new link | |
1358 | * @dentry: dentry for file | |
1359 | * @mode: mode for creation | |
ee443996 | 1360 | * @rdev: device associated with special file |
2bad8471 EVH |
1361 | * |
1362 | */ | |
1363 | ||
1364 | static int | |
1365 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1366 | { | |
531b1094 LI |
1367 | int retval; |
1368 | char *name; | |
2bad8471 | 1369 | |
bd238fb4 LI |
1370 | P9_DPRINTK(P9_DEBUG_VFS, |
1371 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1372 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1373 | ||
531b1094 LI |
1374 | if (!new_valid_dev(rdev)) |
1375 | return -EINVAL; | |
2bad8471 | 1376 | |
531b1094 | 1377 | name = __getname(); |
c0291a05 ET |
1378 | if (!name) |
1379 | return -ENOMEM; | |
2bad8471 EVH |
1380 | /* build extension */ |
1381 | if (S_ISBLK(mode)) | |
531b1094 | 1382 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1383 | else if (S_ISCHR(mode)) |
531b1094 | 1384 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1385 | else if (S_ISFIFO(mode)) |
531b1094 | 1386 | *name = 0; |
75cc5c9b VJ |
1387 | else if (S_ISSOCK(mode)) |
1388 | *name = 0; | |
2bad8471 | 1389 | else { |
531b1094 LI |
1390 | __putname(name); |
1391 | return -EINVAL; | |
2bad8471 EVH |
1392 | } |
1393 | ||
531b1094 LI |
1394 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1395 | __putname(name); | |
2bad8471 EVH |
1396 | |
1397 | return retval; | |
1398 | } | |
1399 | ||
b3cbea03 AK |
1400 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) |
1401 | { | |
1402 | loff_t i_size; | |
1403 | struct p9_wstat *st; | |
1404 | struct v9fs_session_info *v9ses; | |
1405 | ||
1406 | v9ses = v9fs_inode2v9ses(inode); | |
1407 | st = p9_client_stat(fid); | |
1408 | if (IS_ERR(st)) | |
1409 | return PTR_ERR(st); | |
1410 | ||
1411 | spin_lock(&inode->i_lock); | |
1412 | /* | |
1413 | * We don't want to refresh inode->i_size, | |
1414 | * because we may have cached data | |
1415 | */ | |
1416 | i_size = inode->i_size; | |
1417 | v9fs_stat2inode(st, inode, inode->i_sb); | |
1418 | if (v9ses->cache) | |
1419 | inode->i_size = i_size; | |
1420 | spin_unlock(&inode->i_lock); | |
1421 | p9stat_free(st); | |
1422 | kfree(st); | |
1423 | return 0; | |
1424 | } | |
1425 | ||
9b6533c9 SK |
1426 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1427 | .create = v9fs_vfs_create, | |
1428 | .lookup = v9fs_vfs_lookup, | |
1429 | .symlink = v9fs_vfs_symlink, | |
50cc42ff | 1430 | .link = v9fs_vfs_link, |
9b6533c9 SK |
1431 | .unlink = v9fs_vfs_unlink, |
1432 | .mkdir = v9fs_vfs_mkdir, | |
1433 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 1434 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
1435 | .rename = v9fs_vfs_rename, |
1436 | .getattr = v9fs_vfs_getattr, | |
1437 | .setattr = v9fs_vfs_setattr, | |
1438 | }; | |
1439 | ||
754661f1 | 1440 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1441 | .create = v9fs_vfs_create, |
1442 | .lookup = v9fs_vfs_lookup, | |
1443 | .unlink = v9fs_vfs_unlink, | |
1444 | .mkdir = v9fs_vfs_mkdir, | |
1445 | .rmdir = v9fs_vfs_rmdir, | |
1446 | .mknod = v9fs_vfs_mknod, | |
1447 | .rename = v9fs_vfs_rename, | |
1448 | .getattr = v9fs_vfs_getattr, | |
1449 | .setattr = v9fs_vfs_setattr, | |
1450 | }; | |
1451 | ||
754661f1 | 1452 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1453 | .getattr = v9fs_vfs_getattr, |
1454 | .setattr = v9fs_vfs_setattr, | |
1455 | }; | |
1456 | ||
754661f1 | 1457 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1458 | .readlink = generic_readlink, |
2bad8471 EVH |
1459 | .follow_link = v9fs_vfs_follow_link, |
1460 | .put_link = v9fs_vfs_put_link, | |
1461 | .getattr = v9fs_vfs_getattr, | |
1462 | .setattr = v9fs_vfs_setattr, | |
1463 | }; | |
9b6533c9 | 1464 |