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 SK |
51 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
52 | static const struct inode_operations v9fs_dir_inode_operations_dotl; | |
754661f1 | 53 | static const struct inode_operations v9fs_file_inode_operations; |
9b6533c9 | 54 | static const struct inode_operations v9fs_file_inode_operations_dotl; |
754661f1 | 55 | static const struct inode_operations v9fs_symlink_inode_operations; |
9b6533c9 | 56 | static const struct inode_operations v9fs_symlink_inode_operations_dotl; |
2bad8471 | 57 | |
f5fc6145 AK |
58 | static int |
59 | v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, | |
60 | dev_t rdev); | |
61 | ||
2bad8471 EVH |
62 | /** |
63 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
64 | * @v9ses: v9fs session information | |
65 | * @mode: mode to convert | |
66 | * | |
67 | */ | |
68 | ||
73c592b9 | 69 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
70 | { |
71 | int res; | |
72 | res = mode & 0777; | |
73 | if (S_ISDIR(mode)) | |
bd238fb4 | 74 | res |= P9_DMDIR; |
dd6102fb | 75 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 76 | if (S_ISLNK(mode)) |
bd238fb4 | 77 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
78 | if (v9ses->nodev == 0) { |
79 | if (S_ISSOCK(mode)) | |
bd238fb4 | 80 | res |= P9_DMSOCKET; |
2bad8471 | 81 | if (S_ISFIFO(mode)) |
bd238fb4 | 82 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 83 | if (S_ISBLK(mode)) |
bd238fb4 | 84 | res |= P9_DMDEVICE; |
2bad8471 | 85 | if (S_ISCHR(mode)) |
bd238fb4 | 86 | res |= P9_DMDEVICE; |
2bad8471 EVH |
87 | } |
88 | ||
89 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 90 | res |= P9_DMSETUID; |
2bad8471 | 91 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 92 | res |= P9_DMSETGID; |
d199d652 AL |
93 | if ((mode & S_ISVTX) == S_ISVTX) |
94 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
95 | if ((mode & P9_DMLINK)) |
96 | res |= P9_DMLINK; | |
2bad8471 EVH |
97 | } |
98 | ||
99 | return res; | |
100 | } | |
101 | ||
102 | /** | |
103 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
104 | * @v9ses: v9fs session information | |
105 | * @mode: mode to convert | |
106 | * | |
107 | */ | |
108 | ||
73c592b9 | 109 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
110 | { |
111 | int res; | |
112 | ||
113 | res = mode & 0777; | |
114 | ||
bd238fb4 | 115 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 116 | res |= S_IFDIR; |
dd6102fb | 117 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 118 | res |= S_IFLNK; |
dd6102fb | 119 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
120 | && (v9ses->nodev == 0)) |
121 | res |= S_IFSOCK; | |
dd6102fb | 122 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
123 | && (v9ses->nodev == 0)) |
124 | res |= S_IFIFO; | |
dd6102fb | 125 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
126 | && (v9ses->nodev == 0)) |
127 | res |= S_IFBLK; | |
128 | else | |
129 | res |= S_IFREG; | |
130 | ||
dd6102fb | 131 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 132 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
133 | res |= S_ISUID; |
134 | ||
bd238fb4 | 135 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 136 | res |= S_ISGID; |
d199d652 AL |
137 | |
138 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
139 | res |= S_ISVTX; | |
2bad8471 EVH |
140 | } |
141 | ||
142 | return res; | |
143 | } | |
144 | ||
ee443996 EVH |
145 | /** |
146 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
147 | * @uflags: flags to convert | |
2e4bef41 | 148 | * @extended: if .u extensions are active |
ee443996 EVH |
149 | */ |
150 | ||
2e4bef41 | 151 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
152 | { |
153 | int ret; | |
154 | ||
155 | ret = 0; | |
156 | switch (uflags&3) { | |
157 | default: | |
158 | case O_RDONLY: | |
bd238fb4 | 159 | ret = P9_OREAD; |
6a3124a3 LI |
160 | break; |
161 | ||
162 | case O_WRONLY: | |
bd238fb4 | 163 | ret = P9_OWRITE; |
6a3124a3 LI |
164 | break; |
165 | ||
166 | case O_RDWR: | |
bd238fb4 | 167 | ret = P9_ORDWR; |
6a3124a3 LI |
168 | break; |
169 | } | |
170 | ||
6a3124a3 | 171 | if (uflags & O_TRUNC) |
bd238fb4 | 172 | ret |= P9_OTRUNC; |
6a3124a3 | 173 | |
2e4bef41 EVH |
174 | if (extended) { |
175 | if (uflags & O_EXCL) | |
176 | ret |= P9_OEXCL; | |
177 | ||
178 | if (uflags & O_APPEND) | |
179 | ret |= P9_OAPPEND; | |
180 | } | |
6a3124a3 LI |
181 | |
182 | return ret; | |
183 | } | |
184 | ||
2bad8471 | 185 | /** |
531b1094 | 186 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 187 | * @wstat: structure to initialize |
2bad8471 EVH |
188 | * |
189 | */ | |
190 | ||
7a4439c4 | 191 | void |
bd238fb4 | 192 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 193 | { |
531b1094 LI |
194 | wstat->type = ~0; |
195 | wstat->dev = ~0; | |
196 | wstat->qid.type = ~0; | |
197 | wstat->qid.version = ~0; | |
198 | *((long long *)&wstat->qid.path) = ~0; | |
199 | wstat->mode = ~0; | |
200 | wstat->atime = ~0; | |
201 | wstat->mtime = ~0; | |
202 | wstat->length = ~0; | |
203 | wstat->name = NULL; | |
204 | wstat->uid = NULL; | |
205 | wstat->gid = NULL; | |
206 | wstat->muid = NULL; | |
207 | wstat->n_uid = ~0; | |
208 | wstat->n_gid = ~0; | |
209 | wstat->n_muid = ~0; | |
210 | wstat->extension = NULL; | |
2bad8471 EVH |
211 | } |
212 | ||
60e78d2c AK |
213 | #ifdef CONFIG_9P_FSCACHE |
214 | /** | |
215 | * v9fs_alloc_inode - helper function to allocate an inode | |
216 | * This callback is executed before setting up the inode so that we | |
217 | * can associate a vcookie with each inode. | |
218 | * | |
219 | */ | |
220 | ||
221 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
222 | { | |
223 | struct v9fs_cookie *vcookie; | |
224 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
225 | GFP_KERNEL); | |
226 | if (!vcookie) | |
227 | return NULL; | |
228 | ||
229 | vcookie->fscache = NULL; | |
230 | vcookie->qid = NULL; | |
231 | spin_lock_init(&vcookie->lock); | |
232 | return &vcookie->inode; | |
233 | } | |
234 | ||
235 | /** | |
236 | * v9fs_destroy_inode - destroy an inode | |
237 | * | |
238 | */ | |
239 | ||
240 | void v9fs_destroy_inode(struct inode *inode) | |
241 | { | |
242 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); | |
243 | } | |
244 | #endif | |
245 | ||
09d34ee5 EVH |
246 | /** |
247 | * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a | |
248 | * new file system object. This checks the S_ISGID to determine the owning | |
249 | * group of the new file system object. | |
250 | */ | |
251 | ||
252 | static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) | |
253 | { | |
254 | BUG_ON(dir_inode == NULL); | |
255 | ||
256 | if (dir_inode->i_mode & S_ISGID) { | |
257 | /* set_gid bit is set.*/ | |
258 | return dir_inode->i_gid; | |
259 | } | |
260 | return current_fsgid(); | |
261 | } | |
262 | ||
263 | /** | |
264 | * v9fs_dentry_from_dir_inode - helper function to get the dentry from | |
265 | * dir inode. | |
266 | * | |
267 | */ | |
268 | ||
ea137533 | 269 | static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode) |
09d34ee5 EVH |
270 | { |
271 | struct dentry *dentry; | |
272 | ||
b23fb0a6 | 273 | spin_lock(&dcache_inode_lock); |
09d34ee5 EVH |
274 | /* Directory should have only one entry. */ |
275 | BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry)); | |
276 | dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias); | |
b23fb0a6 | 277 | spin_unlock(&dcache_inode_lock); |
09d34ee5 EVH |
278 | return dentry; |
279 | } | |
280 | ||
2bad8471 EVH |
281 | /** |
282 | * v9fs_get_inode - helper function to setup an inode | |
283 | * @sb: superblock | |
284 | * @mode: mode to setup inode with | |
285 | * | |
286 | */ | |
287 | ||
288 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
289 | { | |
2bb54115 | 290 | int err; |
6a3124a3 | 291 | struct inode *inode; |
b501611a | 292 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 293 | |
bd238fb4 | 294 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
295 | |
296 | inode = new_inode(sb); | |
2bb54115 AK |
297 | if (!inode) { |
298 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 299 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
300 | } |
301 | ||
217f206d | 302 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
303 | inode->i_blocks = 0; |
304 | inode->i_rdev = 0; | |
305 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
306 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
307 | ||
308 | switch (mode & S_IFMT) { | |
309 | case S_IFIFO: | |
310 | case S_IFBLK: | |
311 | case S_IFCHR: | |
312 | case S_IFSOCK: | |
4b43516a MK |
313 | if (v9fs_proto_dotl(v9ses)) { |
314 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
315 | inode->i_fop = &v9fs_file_operations_dotl; | |
316 | } else if (v9fs_proto_dotu(v9ses)) { | |
317 | inode->i_op = &v9fs_file_inode_operations; | |
318 | inode->i_fop = &v9fs_file_operations; | |
319 | } else { | |
bd238fb4 | 320 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
321 | "special files without extended mode\n"); |
322 | err = -EINVAL; | |
323 | goto error; | |
2bad8471 | 324 | } |
2bb54115 AK |
325 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
326 | break; | |
327 | case S_IFREG: | |
9b6533c9 SK |
328 | if (v9fs_proto_dotl(v9ses)) { |
329 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
330 | inode->i_fop = &v9fs_file_operations_dotl; | |
331 | } else { | |
332 | inode->i_op = &v9fs_file_inode_operations; | |
333 | inode->i_fop = &v9fs_file_operations; | |
334 | } | |
335 | ||
2bb54115 | 336 | break; |
9b6533c9 | 337 | |
2bb54115 | 338 | case S_IFLNK: |
9b6533c9 SK |
339 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
340 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
341 | "legacy protocol.\n"); | |
2bb54115 AK |
342 | err = -EINVAL; |
343 | goto error; | |
344 | } | |
9b6533c9 SK |
345 | |
346 | if (v9fs_proto_dotl(v9ses)) | |
347 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
348 | else | |
349 | inode->i_op = &v9fs_symlink_inode_operations; | |
350 | ||
2bb54115 AK |
351 | break; |
352 | case S_IFDIR: | |
353 | inc_nlink(inode); | |
9b6533c9 SK |
354 | if (v9fs_proto_dotl(v9ses)) |
355 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
356 | else if (v9fs_proto_dotu(v9ses)) | |
357 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
358 | else |
359 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
360 | |
361 | if (v9fs_proto_dotl(v9ses)) | |
362 | inode->i_fop = &v9fs_dir_operations_dotl; | |
363 | else | |
364 | inode->i_fop = &v9fs_dir_operations; | |
365 | ||
2bb54115 AK |
366 | break; |
367 | default: | |
368 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
369 | mode, mode & S_IFMT); | |
370 | err = -EINVAL; | |
371 | goto error; | |
2bad8471 | 372 | } |
2bb54115 | 373 | |
2bad8471 | 374 | return inode; |
2bb54115 AK |
375 | |
376 | error: | |
377 | iput(inode); | |
378 | return ERR_PTR(err); | |
2bad8471 EVH |
379 | } |
380 | ||
bd238fb4 | 381 | /* |
6a3124a3 LI |
382 | static struct v9fs_fid* |
383 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
384 | { | |
385 | int err; | |
736c4b85 | 386 | int nfid; |
6a3124a3 LI |
387 | struct v9fs_fid *ret; |
388 | struct v9fs_fcall *fcall; | |
389 | ||
390 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
391 | if (nfid < 0) { | |
0b8dd177 | 392 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 393 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
394 | } |
395 | ||
6a3124a3 LI |
396 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
397 | &fcall); | |
398 | ||
399 | if (err < 0) { | |
41e5a6ac LI |
400 | if (fcall && fcall->id == RWALK) |
401 | goto clunk_fid; | |
402 | ||
6a3124a3 LI |
403 | PRINT_FCALL_ERROR("walk error", fcall); |
404 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
405 | goto error; | |
0b8dd177 | 406 | } |
6a3124a3 | 407 | |
3cf6429a LI |
408 | kfree(fcall); |
409 | fcall = NULL; | |
6a3124a3 LI |
410 | ret = v9fs_fid_create(v9ses, nfid); |
411 | if (!ret) { | |
412 | err = -ENOMEM; | |
413 | goto clunk_fid; | |
414 | } | |
0b8dd177 | 415 | |
6a3124a3 LI |
416 | err = v9fs_fid_insert(ret, dentry); |
417 | if (err < 0) { | |
418 | v9fs_fid_destroy(ret); | |
419 | goto clunk_fid; | |
0b8dd177 | 420 | } |
2bad8471 | 421 | |
6a3124a3 | 422 | return ret; |
2bad8471 | 423 | |
6a3124a3 LI |
424 | clunk_fid: |
425 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 426 | |
6a3124a3 LI |
427 | error: |
428 | kfree(fcall); | |
429 | return ERR_PTR(err); | |
430 | } | |
bd238fb4 | 431 | */ |
2bad8471 | 432 | |
60e78d2c AK |
433 | |
434 | /** | |
435 | * v9fs_clear_inode - release an inode | |
436 | * @inode: inode to release | |
437 | * | |
438 | */ | |
b57922d9 | 439 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 440 | { |
b57922d9 AV |
441 | truncate_inode_pages(inode->i_mapping, 0); |
442 | end_writeback(inode); | |
60e78d2c AK |
443 | filemap_fdatawrite(inode->i_mapping); |
444 | ||
445 | #ifdef CONFIG_9P_FSCACHE | |
446 | v9fs_cache_inode_put_cookie(inode); | |
447 | #endif | |
448 | } | |
449 | ||
5174fdab | 450 | static struct inode * |
f0853122 | 451 | v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
452 | struct super_block *sb) |
453 | { | |
454 | int err, umode; | |
f0853122 | 455 | struct inode *ret = NULL; |
51a87c55 | 456 | struct p9_wstat *st; |
531b1094 | 457 | |
bd238fb4 | 458 | st = p9_client_stat(fid); |
02bc3567 AK |
459 | if (IS_ERR(st)) |
460 | return ERR_CAST(st); | |
2bad8471 | 461 | |
bd238fb4 | 462 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
463 | ret = v9fs_get_inode(sb, umode); |
464 | if (IS_ERR(ret)) { | |
465 | err = PTR_ERR(ret); | |
6a3124a3 LI |
466 | goto error; |
467 | } | |
2bad8471 | 468 | |
bd238fb4 LI |
469 | v9fs_stat2inode(st, ret, sb); |
470 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
471 | |
472 | #ifdef CONFIG_9P_FSCACHE | |
473 | v9fs_vcookie_set_qid(ret, &st->qid); | |
474 | v9fs_cache_inode_get_cookie(ret); | |
475 | #endif | |
02bc3567 | 476 | p9stat_free(st); |
bd238fb4 | 477 | kfree(st); |
6a3124a3 | 478 | return ret; |
6a3124a3 | 479 | error: |
02bc3567 | 480 | p9stat_free(st); |
bd238fb4 | 481 | kfree(st); |
6a3124a3 | 482 | return ERR_PTR(err); |
2bad8471 EVH |
483 | } |
484 | ||
f0853122 SK |
485 | static struct inode * |
486 | v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, | |
487 | struct super_block *sb) | |
488 | { | |
489 | struct inode *ret = NULL; | |
490 | int err; | |
491 | struct p9_stat_dotl *st; | |
492 | ||
493 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
494 | if (IS_ERR(st)) | |
495 | return ERR_CAST(st); | |
496 | ||
497 | ret = v9fs_get_inode(sb, st->st_mode); | |
498 | if (IS_ERR(ret)) { | |
499 | err = PTR_ERR(ret); | |
500 | goto error; | |
501 | } | |
502 | ||
503 | v9fs_stat2inode_dotl(st, ret); | |
504 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
505 | #ifdef CONFIG_9P_FSCACHE | |
506 | v9fs_vcookie_set_qid(ret, &st->qid); | |
507 | v9fs_cache_inode_get_cookie(ret); | |
508 | #endif | |
85ff872d AK |
509 | err = v9fs_get_acl(ret, fid); |
510 | if (err) { | |
511 | iput(ret); | |
512 | goto error; | |
513 | } | |
f0853122 SK |
514 | kfree(st); |
515 | return ret; | |
516 | error: | |
517 | kfree(st); | |
518 | return ERR_PTR(err); | |
519 | } | |
520 | ||
521 | /** | |
522 | * v9fs_inode_from_fid - Helper routine to populate an inode by | |
523 | * issuing a attribute request | |
524 | * @v9ses: session information | |
525 | * @fid: fid to issue attribute request for | |
526 | * @sb: superblock on which to create inode | |
527 | * | |
528 | */ | |
529 | static inline struct inode * | |
530 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, | |
531 | struct super_block *sb) | |
532 | { | |
533 | if (v9fs_proto_dotl(v9ses)) | |
534 | return v9fs_inode_dotl(v9ses, fid, sb); | |
535 | else | |
536 | return v9fs_inode(v9ses, fid, sb); | |
537 | } | |
538 | ||
2bad8471 EVH |
539 | /** |
540 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
541 | * @dir: directory inode that is being deleted |
542 | * @file: dentry that is being deleted | |
543 | * @rmdir: removing a directory | |
2bad8471 EVH |
544 | * |
545 | */ | |
546 | ||
547 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
548 | { | |
d994f405 | 549 | int retval; |
bd238fb4 | 550 | struct inode *file_inode; |
bd238fb4 | 551 | struct p9_fid *v9fid; |
2bad8471 | 552 | |
bd238fb4 | 553 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
554 | rmdir); |
555 | ||
556 | file_inode = file->d_inode; | |
c959df9f | 557 | v9fid = v9fs_fid_clone(file); |
ba17674f | 558 | if (IS_ERR(v9fid)) |
da977b2c | 559 | return PTR_ERR(v9fid); |
2bad8471 | 560 | |
d994f405 AK |
561 | retval = p9_client_remove(v9fid); |
562 | if (!retval) | |
563 | drop_nlink(file_inode); | |
564 | return retval; | |
2bad8471 EVH |
565 | } |
566 | ||
567 | /** | |
bd238fb4 | 568 | * v9fs_create - Create a file |
ee443996 EVH |
569 | * @v9ses: session information |
570 | * @dir: directory that dentry is being created in | |
bd238fb4 | 571 | * @dentry: dentry that is being created |
0e15597e | 572 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
573 | * @perm: create permissions |
574 | * @mode: open mode | |
2bad8471 EVH |
575 | * |
576 | */ | |
bd238fb4 LI |
577 | static struct p9_fid * |
578 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
579 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 580 | { |
6a3124a3 | 581 | int err; |
bd238fb4 LI |
582 | char *name; |
583 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 584 | struct inode *inode; |
6a3124a3 | 585 | |
51a87c55 EVH |
586 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
587 | ||
bd238fb4 LI |
588 | err = 0; |
589 | ofid = NULL; | |
590 | fid = NULL; | |
591 | name = (char *) dentry->d_name.name; | |
6d27e64d | 592 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 593 | if (IS_ERR(dfid)) { |
da977b2c | 594 | err = PTR_ERR(dfid); |
6d27e64d VJ |
595 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
596 | return ERR_PTR(err); | |
da977b2c | 597 | } |
6a3124a3 | 598 | |
bd238fb4 LI |
599 | /* clone a fid to use for creation */ |
600 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
601 | if (IS_ERR(ofid)) { | |
602 | err = PTR_ERR(ofid); | |
51a87c55 | 603 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 604 | return ERR_PTR(err); |
bd238fb4 | 605 | } |
6a3124a3 | 606 | |
bd238fb4 | 607 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
608 | if (err < 0) { |
609 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 610 | goto error; |
51a87c55 | 611 | } |
6a3124a3 | 612 | |
bd238fb4 | 613 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 614 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
615 | if (IS_ERR(fid)) { |
616 | err = PTR_ERR(fid); | |
51a87c55 | 617 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 618 | fid = NULL; |
6a3124a3 | 619 | goto error; |
6d27e64d | 620 | } |
6a3124a3 | 621 | |
bd238fb4 LI |
622 | /* instantiate inode and assign the unopened fid to the dentry */ |
623 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
624 | if (IS_ERR(inode)) { |
625 | err = PTR_ERR(inode); | |
51a87c55 | 626 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
627 | goto error; |
628 | } | |
629 | ||
ba17674f | 630 | if (v9ses->cache) |
e03abc0c EVH |
631 | dentry->d_op = &v9fs_cached_dentry_operations; |
632 | else | |
633 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 634 | |
6a3124a3 | 635 | d_instantiate(dentry, inode); |
50fb6d2b AK |
636 | err = v9fs_fid_add(dentry, fid); |
637 | if (err < 0) | |
638 | goto error; | |
639 | ||
bd238fb4 | 640 | return ofid; |
6a3124a3 | 641 | |
bd238fb4 | 642 | error: |
bd238fb4 LI |
643 | if (ofid) |
644 | p9_client_clunk(ofid); | |
645 | ||
646 | if (fid) | |
647 | p9_client_clunk(fid); | |
648 | ||
649 | return ERR_PTR(err); | |
650 | } | |
651 | ||
5643135a VJJ |
652 | /** |
653 | * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. | |
654 | * @dir: directory inode that is being created | |
655 | * @dentry: dentry that is being deleted | |
656 | * @mode: create permissions | |
657 | * @nd: path information | |
658 | * | |
659 | */ | |
660 | ||
661 | static int | |
ad77dbce | 662 | v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode, |
5643135a VJJ |
663 | struct nameidata *nd) |
664 | { | |
665 | int err = 0; | |
666 | char *name = NULL; | |
667 | gid_t gid; | |
668 | int flags; | |
ad77dbce | 669 | mode_t mode; |
5643135a VJJ |
670 | struct v9fs_session_info *v9ses; |
671 | struct p9_fid *fid = NULL; | |
672 | struct p9_fid *dfid, *ofid; | |
673 | struct file *filp; | |
674 | struct p9_qid qid; | |
675 | struct inode *inode; | |
ad77dbce | 676 | struct posix_acl *pacl = NULL, *dacl = NULL; |
5643135a VJJ |
677 | |
678 | v9ses = v9fs_inode2v9ses(dir); | |
679 | if (nd && nd->flags & LOOKUP_OPEN) | |
680 | flags = nd->intent.open.flags - 1; | |
f5fc6145 AK |
681 | else { |
682 | /* | |
683 | * create call without LOOKUP_OPEN is due | |
684 | * to mknod of regular files. So use mknod | |
685 | * operation. | |
686 | */ | |
687 | return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); | |
688 | } | |
5643135a VJJ |
689 | |
690 | name = (char *) dentry->d_name.name; | |
691 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x " | |
ad77dbce | 692 | "mode:0x%x\n", name, flags, omode); |
5643135a VJJ |
693 | |
694 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
695 | if (IS_ERR(dfid)) { | |
696 | err = PTR_ERR(dfid); | |
697 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
698 | return err; | |
699 | } | |
700 | ||
701 | /* clone a fid to use for creation */ | |
702 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
703 | if (IS_ERR(ofid)) { | |
704 | err = PTR_ERR(ofid); | |
705 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); | |
706 | return err; | |
707 | } | |
708 | ||
709 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
710 | |
711 | mode = omode; | |
712 | /* Update mode based on ACL value */ | |
713 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
714 | if (err) { | |
715 | P9_DPRINTK(P9_DEBUG_VFS, | |
716 | "Failed to get acl values in creat %d\n", err); | |
717 | goto error; | |
718 | } | |
5643135a VJJ |
719 | err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid); |
720 | if (err < 0) { | |
721 | P9_DPRINTK(P9_DEBUG_VFS, | |
722 | "p9_client_open_dotl failed in creat %d\n", | |
723 | err); | |
724 | goto error; | |
725 | } | |
ad77dbce AK |
726 | /* instantiate inode and assign the unopened fid to the dentry */ |
727 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE || | |
728 | (nd && nd->flags & LOOKUP_OPEN)) { | |
729 | fid = p9_client_walk(dfid, 1, &name, 1); | |
730 | if (IS_ERR(fid)) { | |
731 | err = PTR_ERR(fid); | |
732 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
733 | err); | |
734 | fid = NULL; | |
735 | goto error; | |
736 | } | |
5643135a | 737 | |
ad77dbce AK |
738 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
739 | if (IS_ERR(inode)) { | |
740 | err = PTR_ERR(inode); | |
741 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
742 | err); | |
743 | goto error; | |
744 | } | |
3c30750f | 745 | dentry->d_op = &v9fs_cached_dentry_operations; |
ad77dbce AK |
746 | d_instantiate(dentry, inode); |
747 | err = v9fs_fid_add(dentry, fid); | |
748 | if (err < 0) | |
749 | goto error; | |
750 | /* The fid would get clunked via a dput */ | |
751 | fid = NULL; | |
752 | } else { | |
753 | /* | |
754 | * Not in cached mode. No need to populate | |
755 | * inode with stat. We need to get an inode | |
756 | * so that we can set the acl with dentry | |
757 | */ | |
758 | inode = v9fs_get_inode(dir->i_sb, mode); | |
759 | if (IS_ERR(inode)) { | |
760 | err = PTR_ERR(inode); | |
761 | goto error; | |
762 | } | |
3c30750f | 763 | dentry->d_op = &v9fs_dentry_operations; |
ad77dbce AK |
764 | d_instantiate(dentry, inode); |
765 | } | |
766 | /* Now set the ACL based on the default value */ | |
767 | v9fs_set_create_acl(dentry, dacl, pacl); | |
5643135a VJJ |
768 | |
769 | /* if we are opening a file, assign the open fid to the file */ | |
770 | if (nd && nd->flags & LOOKUP_OPEN) { | |
877cb3d4 | 771 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
5643135a VJJ |
772 | if (IS_ERR(filp)) { |
773 | p9_client_clunk(ofid); | |
774 | return PTR_ERR(filp); | |
775 | } | |
776 | filp->private_data = ofid; | |
777 | } else | |
778 | p9_client_clunk(ofid); | |
779 | ||
780 | return 0; | |
781 | ||
782 | error: | |
783 | if (ofid) | |
784 | p9_client_clunk(ofid); | |
785 | if (fid) | |
786 | p9_client_clunk(fid); | |
787 | return err; | |
788 | } | |
789 | ||
bd238fb4 LI |
790 | /** |
791 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 792 | * @dir: directory inode that is being created |
bd238fb4 LI |
793 | * @dentry: dentry that is being deleted |
794 | * @mode: create permissions | |
795 | * @nd: path information | |
796 | * | |
797 | */ | |
6a3124a3 | 798 | |
bd238fb4 LI |
799 | static int |
800 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
801 | struct nameidata *nd) | |
802 | { | |
803 | int err; | |
804 | u32 perm; | |
805 | int flags; | |
806 | struct v9fs_session_info *v9ses; | |
807 | struct p9_fid *fid; | |
808 | struct file *filp; | |
809 | ||
810 | err = 0; | |
811 | fid = NULL; | |
812 | v9ses = v9fs_inode2v9ses(dir); | |
813 | perm = unixmode2p9mode(v9ses, mode); | |
814 | if (nd && nd->flags & LOOKUP_OPEN) | |
815 | flags = nd->intent.open.flags - 1; | |
816 | else | |
817 | flags = O_RDWR; | |
818 | ||
819 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
820 | v9fs_uflags2omode(flags, |
821 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
822 | if (IS_ERR(fid)) { |
823 | err = PTR_ERR(fid); | |
824 | fid = NULL; | |
825 | goto error; | |
826 | } | |
827 | ||
828 | /* if we are opening a file, assign the open fid to the file */ | |
829 | if (nd && nd->flags & LOOKUP_OPEN) { | |
877cb3d4 | 830 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
6a3124a3 | 831 | if (IS_ERR(filp)) { |
bd238fb4 LI |
832 | err = PTR_ERR(filp); |
833 | goto error; | |
6a3124a3 LI |
834 | } |
835 | ||
bd238fb4 LI |
836 | filp->private_data = fid; |
837 | } else | |
838 | p9_client_clunk(fid); | |
6a3124a3 LI |
839 | |
840 | return 0; | |
841 | ||
842 | error: | |
bd238fb4 LI |
843 | if (fid) |
844 | p9_client_clunk(fid); | |
6a3124a3 | 845 | |
6a3124a3 | 846 | return err; |
2bad8471 EVH |
847 | } |
848 | ||
849 | /** | |
850 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 851 | * @dir: inode that is being unlinked |
2bad8471 EVH |
852 | * @dentry: dentry that is being unlinked |
853 | * @mode: mode for new directory | |
854 | * | |
855 | */ | |
856 | ||
6a3124a3 | 857 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 858 | { |
6a3124a3 | 859 | int err; |
bd238fb4 | 860 | u32 perm; |
6a3124a3 | 861 | struct v9fs_session_info *v9ses; |
bd238fb4 | 862 | struct p9_fid *fid; |
6a3124a3 | 863 | |
bd238fb4 LI |
864 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
865 | err = 0; | |
6a3124a3 | 866 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 867 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
868 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
869 | if (IS_ERR(fid)) { | |
870 | err = PTR_ERR(fid); | |
871 | fid = NULL; | |
6a3124a3 LI |
872 | } |
873 | ||
bd238fb4 LI |
874 | if (fid) |
875 | p9_client_clunk(fid); | |
6a3124a3 | 876 | |
6a3124a3 | 877 | return err; |
2bad8471 EVH |
878 | } |
879 | ||
01a622bd MK |
880 | |
881 | /** | |
882 | * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory | |
883 | * @dir: inode that is being unlinked | |
884 | * @dentry: dentry that is being unlinked | |
885 | * @mode: mode for new directory | |
886 | * | |
887 | */ | |
888 | ||
ad77dbce AK |
889 | static int v9fs_vfs_mkdir_dotl(struct inode *dir, |
890 | struct dentry *dentry, int omode) | |
01a622bd MK |
891 | { |
892 | int err; | |
893 | struct v9fs_session_info *v9ses; | |
894 | struct p9_fid *fid = NULL, *dfid = NULL; | |
895 | gid_t gid; | |
896 | char *name; | |
ad77dbce | 897 | mode_t mode; |
01a622bd MK |
898 | struct inode *inode; |
899 | struct p9_qid qid; | |
900 | struct dentry *dir_dentry; | |
ad77dbce | 901 | struct posix_acl *dacl = NULL, *pacl = NULL; |
01a622bd MK |
902 | |
903 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); | |
904 | err = 0; | |
905 | v9ses = v9fs_inode2v9ses(dir); | |
906 | ||
ad77dbce | 907 | omode |= S_IFDIR; |
7c7298cf | 908 | if (dir->i_mode & S_ISGID) |
ad77dbce AK |
909 | omode |= S_ISGID; |
910 | ||
01a622bd MK |
911 | dir_dentry = v9fs_dentry_from_dir_inode(dir); |
912 | dfid = v9fs_fid_lookup(dir_dentry); | |
913 | if (IS_ERR(dfid)) { | |
914 | err = PTR_ERR(dfid); | |
915 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
916 | dfid = NULL; | |
917 | goto error; | |
918 | } | |
919 | ||
920 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
921 | mode = omode; |
922 | /* Update mode based on ACL value */ | |
923 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
924 | if (err) { | |
925 | P9_DPRINTK(P9_DEBUG_VFS, | |
926 | "Failed to get acl values in mkdir %d\n", err); | |
927 | goto error; | |
928 | } | |
01a622bd MK |
929 | name = (char *) dentry->d_name.name; |
930 | err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); | |
931 | if (err < 0) | |
932 | goto error; | |
933 | ||
934 | /* instantiate inode and assign the unopened fid to the dentry */ | |
935 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
936 | fid = p9_client_walk(dfid, 1, &name, 1); | |
937 | if (IS_ERR(fid)) { | |
938 | err = PTR_ERR(fid); | |
939 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
940 | err); | |
941 | fid = NULL; | |
942 | goto error; | |
943 | } | |
944 | ||
945 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
946 | if (IS_ERR(inode)) { | |
947 | err = PTR_ERR(inode); | |
948 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
949 | err); | |
950 | goto error; | |
951 | } | |
952 | dentry->d_op = &v9fs_cached_dentry_operations; | |
953 | d_instantiate(dentry, inode); | |
954 | err = v9fs_fid_add(dentry, fid); | |
955 | if (err < 0) | |
956 | goto error; | |
957 | fid = NULL; | |
ad77dbce AK |
958 | } else { |
959 | /* | |
960 | * Not in cached mode. No need to populate | |
961 | * inode with stat. We need to get an inode | |
962 | * so that we can set the acl with dentry | |
963 | */ | |
964 | inode = v9fs_get_inode(dir->i_sb, mode); | |
965 | if (IS_ERR(inode)) { | |
966 | err = PTR_ERR(inode); | |
967 | goto error; | |
968 | } | |
969 | dentry->d_op = &v9fs_dentry_operations; | |
970 | d_instantiate(dentry, inode); | |
01a622bd | 971 | } |
ad77dbce AK |
972 | /* Now set the ACL based on the default value */ |
973 | v9fs_set_create_acl(dentry, dacl, pacl); | |
974 | ||
01a622bd MK |
975 | error: |
976 | if (fid) | |
977 | p9_client_clunk(fid); | |
978 | return err; | |
979 | } | |
980 | ||
2bad8471 EVH |
981 | /** |
982 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
983 | * @dir: inode that is being walked from | |
984 | * @dentry: dentry that is being walked to? | |
985 | * @nameidata: path data | |
986 | * | |
987 | */ | |
988 | ||
989 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
990 | struct nameidata *nameidata) | |
991 | { | |
992 | struct super_block *sb; | |
993 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 994 | struct p9_fid *dfid, *fid; |
2bad8471 | 995 | struct inode *inode; |
bd238fb4 | 996 | char *name; |
2bad8471 EVH |
997 | int result = 0; |
998 | ||
bd238fb4 | 999 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 1000 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 1001 | |
11e9b49b SK |
1002 | if (dentry->d_name.len > NAME_MAX) |
1003 | return ERR_PTR(-ENAMETOOLONG); | |
1004 | ||
2bad8471 EVH |
1005 | sb = dir->i_sb; |
1006 | v9ses = v9fs_inode2v9ses(dir); | |
a534c8d1 | 1007 | /* We can walk d_parent because we hold the dir->i_mutex */ |
bd238fb4 LI |
1008 | dfid = v9fs_fid_lookup(dentry->d_parent); |
1009 | if (IS_ERR(dfid)) | |
e231c2ee | 1010 | return ERR_CAST(dfid); |
bd238fb4 LI |
1011 | |
1012 | name = (char *) dentry->d_name.name; | |
1013 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1014 | if (IS_ERR(fid)) { | |
1015 | result = PTR_ERR(fid); | |
2bad8471 | 1016 | if (result == -ENOENT) { |
85e0df24 AK |
1017 | inode = NULL; |
1018 | goto inst_out; | |
2bad8471 | 1019 | } |
2bad8471 | 1020 | |
bd238fb4 | 1021 | return ERR_PTR(result); |
2bad8471 EVH |
1022 | } |
1023 | ||
bd238fb4 LI |
1024 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
1025 | if (IS_ERR(inode)) { | |
1026 | result = PTR_ERR(inode); | |
1027 | inode = NULL; | |
1028 | goto error; | |
2bad8471 EVH |
1029 | } |
1030 | ||
bd238fb4 | 1031 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 1032 | if (result < 0) |
9856af8b | 1033 | goto error_iput; |
6a3124a3 | 1034 | |
85e0df24 AK |
1035 | inst_out: |
1036 | if (v9ses->cache) | |
e03abc0c EVH |
1037 | dentry->d_op = &v9fs_cached_dentry_operations; |
1038 | else | |
1039 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
1040 | |
1041 | d_add(dentry, inode); | |
2bad8471 EVH |
1042 | return NULL; |
1043 | ||
9856af8b AK |
1044 | error_iput: |
1045 | iput(inode); | |
bd238fb4 | 1046 | error: |
62aa528e | 1047 | p9_client_clunk(fid); |
da977b2c | 1048 | |
2bad8471 EVH |
1049 | return ERR_PTR(result); |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
1054 | * @i: inode that is being unlinked | |
73c592b9 | 1055 | * @d: dentry that is being unlinked |
2bad8471 EVH |
1056 | * |
1057 | */ | |
1058 | ||
1059 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
1060 | { | |
1061 | return v9fs_remove(i, d, 0); | |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
1066 | * @i: inode that is being unlinked | |
73c592b9 | 1067 | * @d: dentry that is being unlinked |
2bad8471 EVH |
1068 | * |
1069 | */ | |
1070 | ||
1071 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
1072 | { | |
1073 | return v9fs_remove(i, d, 1); | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * v9fs_vfs_rename - VFS hook to rename an inode | |
1078 | * @old_dir: old dir inode | |
1079 | * @old_dentry: old dentry | |
1080 | * @new_dir: new dir inode | |
1081 | * @new_dentry: new dentry | |
1082 | * | |
1083 | */ | |
1084 | ||
1085 | static int | |
1086 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1087 | struct inode *new_dir, struct dentry *new_dentry) | |
1088 | { | |
bd238fb4 LI |
1089 | struct inode *old_inode; |
1090 | struct v9fs_session_info *v9ses; | |
1091 | struct p9_fid *oldfid; | |
1092 | struct p9_fid *olddirfid; | |
1093 | struct p9_fid *newdirfid; | |
1094 | struct p9_wstat wstat; | |
1095 | int retval; | |
2bad8471 | 1096 | |
bd238fb4 LI |
1097 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
1098 | retval = 0; | |
1099 | old_inode = old_dentry->d_inode; | |
1100 | v9ses = v9fs_inode2v9ses(old_inode); | |
1101 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 1102 | if (IS_ERR(oldfid)) |
da977b2c EVH |
1103 | return PTR_ERR(oldfid); |
1104 | ||
1105 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 1106 | if (IS_ERR(olddirfid)) { |
da977b2c | 1107 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 1108 | goto done; |
da977b2c EVH |
1109 | } |
1110 | ||
1111 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 1112 | if (IS_ERR(newdirfid)) { |
da977b2c | 1113 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 1114 | goto clunk_olddir; |
2bad8471 EVH |
1115 | } |
1116 | ||
a534c8d1 | 1117 | down_write(&v9ses->rename_sem); |
4681dbda SK |
1118 | if (v9fs_proto_dotl(v9ses)) { |
1119 | retval = p9_client_rename(oldfid, newdirfid, | |
1120 | (char *) new_dentry->d_name.name); | |
1121 | if (retval != -ENOSYS) | |
1122 | goto clunk_newdir; | |
1123 | } | |
a534c8d1 AK |
1124 | if (old_dentry->d_parent != new_dentry->d_parent) { |
1125 | /* | |
1126 | * 9P .u can only handle file rename in the same directory | |
1127 | */ | |
4681dbda | 1128 | |
bd238fb4 LI |
1129 | P9_DPRINTK(P9_DEBUG_ERROR, |
1130 | "old dir and new dir are different\n"); | |
621997cd | 1131 | retval = -EXDEV; |
bd238fb4 | 1132 | goto clunk_newdir; |
2bad8471 | 1133 | } |
531b1094 | 1134 | v9fs_blank_wstat(&wstat); |
ba17674f | 1135 | wstat.muid = v9ses->uname; |
531b1094 | 1136 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 1137 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 1138 | |
bd238fb4 | 1139 | clunk_newdir: |
a534c8d1 AK |
1140 | if (!retval) |
1141 | /* successful rename */ | |
1142 | d_move(old_dentry, new_dentry); | |
1143 | up_write(&v9ses->rename_sem); | |
22150c4f | 1144 | p9_client_clunk(newdirfid); |
2bad8471 | 1145 | |
bd238fb4 | 1146 | clunk_olddir: |
22150c4f | 1147 | p9_client_clunk(olddirfid); |
da977b2c | 1148 | |
bd238fb4 | 1149 | done: |
2bad8471 EVH |
1150 | return retval; |
1151 | } | |
1152 | ||
1153 | /** | |
943ffb58 | 1154 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
1155 | * @mnt: mount information |
1156 | * @dentry: file to get attributes on | |
1157 | * @stat: metadata structure to populate | |
2bad8471 EVH |
1158 | * |
1159 | */ | |
1160 | ||
1161 | static int | |
1162 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1163 | struct kstat *stat) | |
1164 | { | |
bd238fb4 LI |
1165 | int err; |
1166 | struct v9fs_session_info *v9ses; | |
1167 | struct p9_fid *fid; | |
51a87c55 | 1168 | struct p9_wstat *st; |
bd238fb4 LI |
1169 | |
1170 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
1171 | err = -EPERM; | |
1172 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 1173 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
1174 | return simple_getattr(mnt, dentry, stat); |
1175 | ||
bd238fb4 LI |
1176 | fid = v9fs_fid_lookup(dentry); |
1177 | if (IS_ERR(fid)) | |
da977b2c | 1178 | return PTR_ERR(fid); |
2bad8471 | 1179 | |
bd238fb4 LI |
1180 | st = p9_client_stat(fid); |
1181 | if (IS_ERR(st)) | |
1182 | return PTR_ERR(st); | |
2bad8471 | 1183 | |
bd238fb4 | 1184 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 1185 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 1186 | |
62b2be59 | 1187 | p9stat_free(st); |
bd238fb4 LI |
1188 | kfree(st); |
1189 | return 0; | |
2bad8471 EVH |
1190 | } |
1191 | ||
f0853122 SK |
1192 | static int |
1193 | v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, | |
1194 | struct kstat *stat) | |
1195 | { | |
1196 | int err; | |
1197 | struct v9fs_session_info *v9ses; | |
1198 | struct p9_fid *fid; | |
1199 | struct p9_stat_dotl *st; | |
1200 | ||
1201 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
1202 | err = -EPERM; | |
1203 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1204 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) | |
1205 | return simple_getattr(mnt, dentry, stat); | |
1206 | ||
1207 | fid = v9fs_fid_lookup(dentry); | |
1208 | if (IS_ERR(fid)) | |
1209 | return PTR_ERR(fid); | |
1210 | ||
1211 | /* Ask for all the fields in stat structure. Server will return | |
1212 | * whatever it supports | |
1213 | */ | |
1214 | ||
1215 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); | |
1216 | if (IS_ERR(st)) | |
1217 | return PTR_ERR(st); | |
1218 | ||
1219 | v9fs_stat2inode_dotl(st, dentry->d_inode); | |
1220 | generic_fillattr(dentry->d_inode, stat); | |
1221 | /* Change block size to what the server returned */ | |
1222 | stat->blksize = st->st_blksize; | |
1223 | ||
1224 | kfree(st); | |
1225 | return 0; | |
1226 | } | |
1227 | ||
2bad8471 EVH |
1228 | /** |
1229 | * v9fs_vfs_setattr - set file metadata | |
1230 | * @dentry: file whose metadata to set | |
1231 | * @iattr: metadata assignment structure | |
1232 | * | |
1233 | */ | |
1234 | ||
1235 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
1236 | { | |
bd238fb4 LI |
1237 | int retval; |
1238 | struct v9fs_session_info *v9ses; | |
1239 | struct p9_fid *fid; | |
1240 | struct p9_wstat wstat; | |
2bad8471 | 1241 | |
bd238fb4 LI |
1242 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
1243 | retval = -EPERM; | |
1244 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1245 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
1246 | if(IS_ERR(fid)) |
1247 | return PTR_ERR(fid); | |
2bad8471 | 1248 | |
531b1094 | 1249 | v9fs_blank_wstat(&wstat); |
2bad8471 | 1250 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 1251 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
1252 | |
1253 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 1254 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
1255 | |
1256 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 1257 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
1258 | |
1259 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 1260 | wstat.length = iattr->ia_size; |
2bad8471 | 1261 | |
dd6102fb | 1262 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1263 | if (iattr->ia_valid & ATTR_UID) |
1264 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 1265 | |
531b1094 LI |
1266 | if (iattr->ia_valid & ATTR_GID) |
1267 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
1268 | } |
1269 | ||
bd238fb4 | 1270 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
1271 | if (retval < 0) |
1272 | return retval; | |
2bad8471 | 1273 | |
1025774c CH |
1274 | if ((iattr->ia_valid & ATTR_SIZE) && |
1275 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
1276 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
1277 | if (retval) | |
1278 | return retval; | |
1279 | } | |
2bad8471 | 1280 | |
1025774c CH |
1281 | setattr_copy(dentry->d_inode, iattr); |
1282 | mark_inode_dirty(dentry->d_inode); | |
1283 | return 0; | |
2bad8471 EVH |
1284 | } |
1285 | ||
87d7845a SK |
1286 | /** |
1287 | * v9fs_vfs_setattr_dotl - set file metadata | |
1288 | * @dentry: file whose metadata to set | |
1289 | * @iattr: metadata assignment structure | |
1290 | * | |
1291 | */ | |
1292 | ||
22d8dcdf | 1293 | int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) |
87d7845a SK |
1294 | { |
1295 | int retval; | |
1296 | struct v9fs_session_info *v9ses; | |
1297 | struct p9_fid *fid; | |
1298 | struct p9_iattr_dotl p9attr; | |
1299 | ||
1300 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); | |
1301 | ||
1302 | retval = inode_change_ok(dentry->d_inode, iattr); | |
1303 | if (retval) | |
1304 | return retval; | |
1305 | ||
1306 | p9attr.valid = iattr->ia_valid; | |
1307 | p9attr.mode = iattr->ia_mode; | |
1308 | p9attr.uid = iattr->ia_uid; | |
1309 | p9attr.gid = iattr->ia_gid; | |
1310 | p9attr.size = iattr->ia_size; | |
1311 | p9attr.atime_sec = iattr->ia_atime.tv_sec; | |
1312 | p9attr.atime_nsec = iattr->ia_atime.tv_nsec; | |
1313 | p9attr.mtime_sec = iattr->ia_mtime.tv_sec; | |
1314 | p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; | |
1315 | ||
1316 | retval = -EPERM; | |
1317 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1318 | fid = v9fs_fid_lookup(dentry); | |
1319 | if (IS_ERR(fid)) | |
1320 | return PTR_ERR(fid); | |
1321 | ||
1322 | retval = p9_client_setattr(fid, &p9attr); | |
8cef9c67 SR |
1323 | if (retval < 0) |
1324 | return retval; | |
87d7845a | 1325 | |
8cef9c67 SR |
1326 | if ((iattr->ia_valid & ATTR_SIZE) && |
1327 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
1328 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
1329 | if (retval) | |
1330 | return retval; | |
1331 | } | |
1332 | ||
1333 | setattr_copy(dentry->d_inode, iattr); | |
1334 | mark_inode_dirty(dentry->d_inode); | |
6e8dc555 AK |
1335 | if (iattr->ia_valid & ATTR_MODE) { |
1336 | /* We also want to update ACL when we update mode bits */ | |
1337 | retval = v9fs_acl_chmod(dentry); | |
1338 | if (retval < 0) | |
1339 | return retval; | |
1340 | } | |
8cef9c67 | 1341 | return 0; |
87d7845a SK |
1342 | } |
1343 | ||
2bad8471 | 1344 | /** |
531b1094 LI |
1345 | * v9fs_stat2inode - populate an inode structure with mistat info |
1346 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
1347 | * @inode: inode to populate |
1348 | * @sb: superblock of filesystem | |
1349 | * | |
1350 | */ | |
1351 | ||
1352 | void | |
51a87c55 | 1353 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 1354 | struct super_block *sb) |
2bad8471 | 1355 | { |
531b1094 | 1356 | char ext[32]; |
5717144a AK |
1357 | char tag_name[14]; |
1358 | unsigned int i_nlink; | |
2bad8471 EVH |
1359 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
1360 | ||
1361 | inode->i_nlink = 1; | |
1362 | ||
531b1094 LI |
1363 | inode->i_atime.tv_sec = stat->atime; |
1364 | inode->i_mtime.tv_sec = stat->mtime; | |
1365 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 1366 | |
bd32b82d LI |
1367 | inode->i_uid = v9ses->dfltuid; |
1368 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 1369 | |
dd6102fb | 1370 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1371 | inode->i_uid = stat->n_uid; |
1372 | inode->i_gid = stat->n_gid; | |
2bad8471 | 1373 | } |
5717144a AK |
1374 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
1375 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
1376 | /* | |
1377 | * Hadlink support got added later to | |
1378 | * to the .u extension. So there can be | |
1379 | * server out there that doesn't support | |
1380 | * this even with .u extension. So check | |
1381 | * for non NULL stat->extension | |
1382 | */ | |
1383 | strncpy(ext, stat->extension, sizeof(ext)); | |
1384 | /* HARDLINKCOUNT %u */ | |
1385 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
1386 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
1387 | inode->i_nlink = i_nlink; | |
1388 | } | |
1389 | } | |
531b1094 | 1390 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
1391 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
1392 | char type = 0; | |
1393 | int major = -1; | |
1394 | int minor = -1; | |
531b1094 | 1395 | |
51a87c55 | 1396 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 1397 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
1398 | switch (type) { |
1399 | case 'c': | |
1400 | inode->i_mode &= ~S_IFBLK; | |
1401 | inode->i_mode |= S_IFCHR; | |
1402 | break; | |
1403 | case 'b': | |
1404 | break; | |
1405 | default: | |
bd238fb4 | 1406 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
1407 | "Unknown special type %c %s\n", type, |
1408 | stat->extension); | |
2bad8471 EVH |
1409 | }; |
1410 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 1411 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
1412 | } else |
1413 | inode->i_rdev = 0; | |
1414 | ||
7549ae3e | 1415 | i_size_write(inode, stat->length); |
2bad8471 | 1416 | |
bd238fb4 | 1417 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 1418 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
1419 | } |
1420 | ||
f0853122 SK |
1421 | /** |
1422 | * v9fs_stat2inode_dotl - populate an inode structure with stat info | |
1423 | * @stat: stat structure | |
1424 | * @inode: inode to populate | |
1425 | * @sb: superblock of filesystem | |
1426 | * | |
1427 | */ | |
1428 | ||
1429 | void | |
1430 | v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) | |
1431 | { | |
1432 | ||
1433 | if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { | |
1434 | inode->i_atime.tv_sec = stat->st_atime_sec; | |
1435 | inode->i_atime.tv_nsec = stat->st_atime_nsec; | |
1436 | inode->i_mtime.tv_sec = stat->st_mtime_sec; | |
1437 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; | |
1438 | inode->i_ctime.tv_sec = stat->st_ctime_sec; | |
1439 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; | |
1440 | inode->i_uid = stat->st_uid; | |
1441 | inode->i_gid = stat->st_gid; | |
1442 | inode->i_nlink = stat->st_nlink; | |
1443 | inode->i_mode = stat->st_mode; | |
1444 | inode->i_rdev = new_decode_dev(stat->st_rdev); | |
1445 | ||
1446 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) | |
1447 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1448 | ||
1449 | i_size_write(inode, stat->st_size); | |
1450 | inode->i_blocks = stat->st_blocks; | |
1451 | } else { | |
1452 | if (stat->st_result_mask & P9_STATS_ATIME) { | |
1453 | inode->i_atime.tv_sec = stat->st_atime_sec; | |
1454 | inode->i_atime.tv_nsec = stat->st_atime_nsec; | |
1455 | } | |
1456 | if (stat->st_result_mask & P9_STATS_MTIME) { | |
1457 | inode->i_mtime.tv_sec = stat->st_mtime_sec; | |
1458 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; | |
1459 | } | |
1460 | if (stat->st_result_mask & P9_STATS_CTIME) { | |
1461 | inode->i_ctime.tv_sec = stat->st_ctime_sec; | |
1462 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; | |
1463 | } | |
1464 | if (stat->st_result_mask & P9_STATS_UID) | |
1465 | inode->i_uid = stat->st_uid; | |
1466 | if (stat->st_result_mask & P9_STATS_GID) | |
1467 | inode->i_gid = stat->st_gid; | |
1468 | if (stat->st_result_mask & P9_STATS_NLINK) | |
1469 | inode->i_nlink = stat->st_nlink; | |
1470 | if (stat->st_result_mask & P9_STATS_MODE) { | |
1471 | inode->i_mode = stat->st_mode; | |
1472 | if ((S_ISBLK(inode->i_mode)) || | |
1473 | (S_ISCHR(inode->i_mode))) | |
1474 | init_special_inode(inode, inode->i_mode, | |
1475 | inode->i_rdev); | |
1476 | } | |
1477 | if (stat->st_result_mask & P9_STATS_RDEV) | |
1478 | inode->i_rdev = new_decode_dev(stat->st_rdev); | |
1479 | if (stat->st_result_mask & P9_STATS_SIZE) | |
1480 | i_size_write(inode, stat->st_size); | |
1481 | if (stat->st_result_mask & P9_STATS_BLOCKS) | |
1482 | inode->i_blocks = stat->st_blocks; | |
1483 | } | |
1484 | if (stat->st_result_mask & P9_STATS_GEN) | |
1485 | inode->i_generation = stat->st_gen; | |
1486 | ||
1487 | /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION | |
1488 | * because the inode structure does not have fields for them. | |
1489 | */ | |
1490 | } | |
1491 | ||
2bad8471 EVH |
1492 | /** |
1493 | * v9fs_qid2ino - convert qid into inode number | |
1494 | * @qid: qid to hash | |
1495 | * | |
1496 | * BUG: potential for inode number collisions? | |
1497 | */ | |
1498 | ||
bd238fb4 | 1499 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
1500 | { |
1501 | u64 path = qid->path + 2; | |
1502 | ino_t i = 0; | |
1503 | ||
1504 | if (sizeof(ino_t) == sizeof(path)) | |
1505 | memcpy(&i, &path, sizeof(ino_t)); | |
1506 | else | |
1507 | i = (ino_t) (path ^ (path >> 32)); | |
1508 | ||
1509 | return i; | |
1510 | } | |
1511 | ||
2bad8471 EVH |
1512 | /** |
1513 | * v9fs_readlink - read a symlink's location (internal version) | |
1514 | * @dentry: dentry for symlink | |
73c592b9 | 1515 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1516 | * @buflen: length of buffer |
1517 | * | |
1518 | */ | |
1519 | ||
1520 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1521 | { | |
bd238fb4 | 1522 | int retval; |
2bad8471 | 1523 | |
bd238fb4 LI |
1524 | struct v9fs_session_info *v9ses; |
1525 | struct p9_fid *fid; | |
51a87c55 | 1526 | struct p9_wstat *st; |
2bad8471 | 1527 | |
bd238fb4 LI |
1528 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1529 | retval = -EPERM; | |
1530 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1531 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1532 | if (IS_ERR(fid)) |
da977b2c | 1533 | return PTR_ERR(fid); |
2bad8471 | 1534 | |
329176cc | 1535 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1536 | return -EBADF; |
2bad8471 | 1537 | |
bd238fb4 LI |
1538 | st = p9_client_stat(fid); |
1539 | if (IS_ERR(st)) | |
1540 | return PTR_ERR(st); | |
2bad8471 | 1541 | |
bd238fb4 | 1542 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1543 | retval = -EINVAL; |
bd238fb4 | 1544 | goto done; |
2bad8471 EVH |
1545 | } |
1546 | ||
1547 | /* copy extension buffer into buffer */ | |
51a87c55 | 1548 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1549 | |
bd238fb4 | 1550 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1551 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1552 | |
2511cd0b | 1553 | retval = strnlen(buffer, buflen); |
bd238fb4 | 1554 | done: |
62b2be59 | 1555 | p9stat_free(st); |
bd238fb4 | 1556 | kfree(st); |
2bad8471 EVH |
1557 | return retval; |
1558 | } | |
1559 | ||
2bad8471 EVH |
1560 | /** |
1561 | * v9fs_vfs_follow_link - follow a symlink path | |
1562 | * @dentry: dentry for symlink | |
1563 | * @nd: nameidata | |
1564 | * | |
1565 | */ | |
1566 | ||
1567 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1568 | { | |
1569 | int len = 0; | |
1570 | char *link = __getname(); | |
1571 | ||
bd238fb4 | 1572 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1573 | |
1574 | if (!link) | |
1575 | link = ERR_PTR(-ENOMEM); | |
1576 | else { | |
16cce6d2 | 1577 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1578 | |
1579 | if (len < 0) { | |
ce44eeb6 | 1580 | __putname(link); |
2bad8471 EVH |
1581 | link = ERR_PTR(len); |
1582 | } else | |
2511cd0b | 1583 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1584 | } |
1585 | nd_set_link(nd, link); | |
1586 | ||
1587 | return NULL; | |
1588 | } | |
1589 | ||
1590 | /** | |
1591 | * v9fs_vfs_put_link - release a symlink path | |
1592 | * @dentry: dentry for symlink | |
1593 | * @nd: nameidata | |
ee443996 | 1594 | * @p: unused |
2bad8471 EVH |
1595 | * |
1596 | */ | |
1597 | ||
ee443996 EVH |
1598 | static void |
1599 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1600 | { |
1601 | char *s = nd_get_link(nd); | |
1602 | ||
6ff23207 DG |
1603 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1604 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1605 | if (!IS_ERR(s)) |
ce44eeb6 | 1606 | __putname(s); |
2bad8471 EVH |
1607 | } |
1608 | ||
ee443996 EVH |
1609 | /** |
1610 | * v9fs_vfs_mkspecial - create a special file | |
1611 | * @dir: inode to create special file in | |
1612 | * @dentry: dentry to create | |
1613 | * @mode: mode to create special file | |
1614 | * @extension: 9p2000.u format extension string representing special file | |
1615 | * | |
1616 | */ | |
1617 | ||
531b1094 LI |
1618 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1619 | int mode, const char *extension) | |
2bad8471 | 1620 | { |
bd238fb4 | 1621 | u32 perm; |
531b1094 | 1622 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1623 | struct p9_fid *fid; |
2bad8471 | 1624 | |
6a3124a3 | 1625 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1626 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1627 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1628 | return -EPERM; |
2bad8471 EVH |
1629 | } |
1630 | ||
da977b2c | 1631 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1632 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1633 | P9_OREAD); | |
1634 | if (IS_ERR(fid)) | |
1635 | return PTR_ERR(fid); | |
da977b2c | 1636 | |
bd238fb4 | 1637 | p9_client_clunk(fid); |
6a3124a3 | 1638 | return 0; |
531b1094 LI |
1639 | } |
1640 | ||
50cc42ff VJJ |
1641 | /** |
1642 | * v9fs_vfs_symlink_dotl - helper function to create symlinks | |
1643 | * @dir: directory inode containing symlink | |
1644 | * @dentry: dentry for symlink | |
1645 | * @symname: symlink data | |
1646 | * | |
1647 | * See Also: 9P2000.L RFC for more information | |
1648 | * | |
1649 | */ | |
1650 | ||
1651 | static int | |
1652 | v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, | |
1653 | const char *symname) | |
1654 | { | |
1655 | struct v9fs_session_info *v9ses; | |
1656 | struct p9_fid *dfid; | |
1657 | struct p9_fid *fid = NULL; | |
1658 | struct inode *inode; | |
1659 | struct p9_qid qid; | |
1660 | char *name; | |
1661 | int err; | |
1662 | gid_t gid; | |
1663 | ||
1664 | name = (char *) dentry->d_name.name; | |
1665 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n", | |
1666 | dir->i_ino, name, symname); | |
1667 | v9ses = v9fs_inode2v9ses(dir); | |
1668 | ||
1669 | dfid = v9fs_fid_lookup(dentry->d_parent); | |
1670 | if (IS_ERR(dfid)) { | |
1671 | err = PTR_ERR(dfid); | |
1672 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
1673 | return err; | |
1674 | } | |
1675 | ||
1676 | gid = v9fs_get_fsgid_for_create(dir); | |
1677 | ||
50cc42ff VJJ |
1678 | /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
1679 | err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); | |
1680 | ||
1681 | if (err < 0) { | |
1682 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); | |
1683 | goto error; | |
1684 | } | |
1685 | ||
1686 | if (v9ses->cache) { | |
1687 | /* Now walk from the parent so we can get an unopened fid. */ | |
1688 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1689 | if (IS_ERR(fid)) { | |
1690 | err = PTR_ERR(fid); | |
1691 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
1692 | err); | |
1693 | fid = NULL; | |
1694 | goto error; | |
1695 | } | |
1696 | ||
1697 | /* instantiate inode and assign the unopened fid to dentry */ | |
1698 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
1699 | if (IS_ERR(inode)) { | |
1700 | err = PTR_ERR(inode); | |
1701 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
1702 | err); | |
1703 | goto error; | |
1704 | } | |
1705 | dentry->d_op = &v9fs_cached_dentry_operations; | |
1706 | d_instantiate(dentry, inode); | |
1707 | err = v9fs_fid_add(dentry, fid); | |
1708 | if (err < 0) | |
1709 | goto error; | |
1710 | fid = NULL; | |
1711 | } else { | |
1712 | /* Not in cached mode. No need to populate inode with stat */ | |
1713 | inode = v9fs_get_inode(dir->i_sb, S_IFLNK); | |
1714 | if (IS_ERR(inode)) { | |
1715 | err = PTR_ERR(inode); | |
1716 | goto error; | |
1717 | } | |
1718 | dentry->d_op = &v9fs_dentry_operations; | |
1719 | d_instantiate(dentry, inode); | |
1720 | } | |
1721 | ||
1722 | error: | |
1723 | if (fid) | |
1724 | p9_client_clunk(fid); | |
1725 | ||
1726 | return err; | |
1727 | } | |
1728 | ||
531b1094 LI |
1729 | /** |
1730 | * v9fs_vfs_symlink - helper function to create symlinks | |
1731 | * @dir: directory inode containing symlink | |
1732 | * @dentry: dentry for symlink | |
1733 | * @symname: symlink data | |
1734 | * | |
ee443996 | 1735 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1736 | * |
1737 | */ | |
1738 | ||
1739 | static int | |
1740 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1741 | { | |
bd238fb4 LI |
1742 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1743 | dentry->d_name.name, symname); | |
531b1094 LI |
1744 | |
1745 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1746 | } | |
1747 | ||
1748 | /** | |
1749 | * v9fs_vfs_link - create a hardlink | |
1750 | * @old_dentry: dentry for file to link to | |
1751 | * @dir: inode destination for new link | |
1752 | * @dentry: dentry for link | |
1753 | * | |
1754 | */ | |
1755 | ||
531b1094 LI |
1756 | static int |
1757 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1758 | struct dentry *dentry) | |
1759 | { | |
1760 | int retval; | |
bd238fb4 | 1761 | struct p9_fid *oldfid; |
531b1094 LI |
1762 | char *name; |
1763 | ||
bd238fb4 LI |
1764 | P9_DPRINTK(P9_DEBUG_VFS, |
1765 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1766 | old_dentry->d_name.name); |
1767 | ||
da977b2c | 1768 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1769 | if (IS_ERR(oldfid)) |
da977b2c | 1770 | return PTR_ERR(oldfid); |
531b1094 LI |
1771 | |
1772 | name = __getname(); | |
da977b2c EVH |
1773 | if (unlikely(!name)) { |
1774 | retval = -ENOMEM; | |
1775 | goto clunk_fid; | |
1776 | } | |
0710d36a | 1777 | |
16cce6d2 | 1778 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1779 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1780 | __putname(name); |
2bad8471 | 1781 | |
da977b2c | 1782 | clunk_fid: |
bd238fb4 | 1783 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1784 | return retval; |
1785 | } | |
1786 | ||
09d34ee5 EVH |
1787 | /** |
1788 | * v9fs_vfs_link_dotl - create a hardlink for dotl | |
1789 | * @old_dentry: dentry for file to link to | |
1790 | * @dir: inode destination for new link | |
1791 | * @dentry: dentry for link | |
1792 | * | |
1793 | */ | |
1794 | ||
1795 | static int | |
1796 | v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, | |
1797 | struct dentry *dentry) | |
1798 | { | |
1799 | int err; | |
1800 | struct p9_fid *dfid, *oldfid; | |
1801 | char *name; | |
1802 | struct v9fs_session_info *v9ses; | |
1803 | struct dentry *dir_dentry; | |
1804 | ||
1805 | P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", | |
1806 | dir->i_ino, old_dentry->d_name.name, | |
1807 | dentry->d_name.name); | |
1808 | ||
1809 | v9ses = v9fs_inode2v9ses(dir); | |
1810 | dir_dentry = v9fs_dentry_from_dir_inode(dir); | |
1811 | dfid = v9fs_fid_lookup(dir_dentry); | |
1812 | if (IS_ERR(dfid)) | |
1813 | return PTR_ERR(dfid); | |
1814 | ||
1815 | oldfid = v9fs_fid_lookup(old_dentry); | |
1816 | if (IS_ERR(oldfid)) | |
1817 | return PTR_ERR(oldfid); | |
1818 | ||
1819 | name = (char *) dentry->d_name.name; | |
1820 | ||
1821 | err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); | |
1822 | ||
1823 | if (err < 0) { | |
1824 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); | |
1825 | return err; | |
1826 | } | |
1827 | ||
1828 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
1829 | /* Get the latest stat info from server. */ | |
1830 | struct p9_fid *fid; | |
1831 | struct p9_stat_dotl *st; | |
1832 | ||
1833 | fid = v9fs_fid_lookup(old_dentry); | |
1834 | if (IS_ERR(fid)) | |
1835 | return PTR_ERR(fid); | |
1836 | ||
1837 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
1838 | if (IS_ERR(st)) | |
1839 | return PTR_ERR(st); | |
1840 | ||
1841 | v9fs_stat2inode_dotl(st, old_dentry->d_inode); | |
1842 | ||
1843 | kfree(st); | |
1844 | } else { | |
1845 | /* Caching disabled. No need to get upto date stat info. | |
7de9c6ee AV |
1846 | * This dentry will be released immediately. So, just hold the |
1847 | * inode | |
09d34ee5 | 1848 | */ |
7de9c6ee | 1849 | ihold(old_dentry->d_inode); |
09d34ee5 EVH |
1850 | } |
1851 | ||
1852 | dentry->d_op = old_dentry->d_op; | |
1853 | d_instantiate(dentry, old_dentry->d_inode); | |
1854 | ||
1855 | return err; | |
1856 | } | |
1857 | ||
2bad8471 EVH |
1858 | /** |
1859 | * v9fs_vfs_mknod - create a special file | |
1860 | * @dir: inode destination for new link | |
1861 | * @dentry: dentry for file | |
1862 | * @mode: mode for creation | |
ee443996 | 1863 | * @rdev: device associated with special file |
2bad8471 EVH |
1864 | * |
1865 | */ | |
1866 | ||
1867 | static int | |
1868 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1869 | { | |
531b1094 LI |
1870 | int retval; |
1871 | char *name; | |
2bad8471 | 1872 | |
bd238fb4 LI |
1873 | P9_DPRINTK(P9_DEBUG_VFS, |
1874 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1875 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1876 | ||
531b1094 LI |
1877 | if (!new_valid_dev(rdev)) |
1878 | return -EINVAL; | |
2bad8471 | 1879 | |
531b1094 | 1880 | name = __getname(); |
c0291a05 ET |
1881 | if (!name) |
1882 | return -ENOMEM; | |
2bad8471 EVH |
1883 | /* build extension */ |
1884 | if (S_ISBLK(mode)) | |
531b1094 | 1885 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1886 | else if (S_ISCHR(mode)) |
531b1094 | 1887 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1888 | else if (S_ISFIFO(mode)) |
531b1094 | 1889 | *name = 0; |
75cc5c9b VJ |
1890 | else if (S_ISSOCK(mode)) |
1891 | *name = 0; | |
2bad8471 | 1892 | else { |
531b1094 LI |
1893 | __putname(name); |
1894 | return -EINVAL; | |
2bad8471 EVH |
1895 | } |
1896 | ||
531b1094 LI |
1897 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1898 | __putname(name); | |
2bad8471 EVH |
1899 | |
1900 | return retval; | |
1901 | } | |
1902 | ||
4b43516a MK |
1903 | /** |
1904 | * v9fs_vfs_mknod_dotl - create a special file | |
1905 | * @dir: inode destination for new link | |
1906 | * @dentry: dentry for file | |
1907 | * @mode: mode for creation | |
1908 | * @rdev: device associated with special file | |
1909 | * | |
1910 | */ | |
1911 | static int | |
ad77dbce | 1912 | v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, |
4b43516a MK |
1913 | dev_t rdev) |
1914 | { | |
1915 | int err; | |
1916 | char *name; | |
ad77dbce | 1917 | mode_t mode; |
4b43516a MK |
1918 | struct v9fs_session_info *v9ses; |
1919 | struct p9_fid *fid = NULL, *dfid = NULL; | |
1920 | struct inode *inode; | |
1921 | gid_t gid; | |
1922 | struct p9_qid qid; | |
01a622bd | 1923 | struct dentry *dir_dentry; |
ad77dbce | 1924 | struct posix_acl *dacl = NULL, *pacl = NULL; |
4b43516a MK |
1925 | |
1926 | P9_DPRINTK(P9_DEBUG_VFS, | |
1927 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
ad77dbce | 1928 | dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev)); |
4b43516a MK |
1929 | |
1930 | if (!new_valid_dev(rdev)) | |
1931 | return -EINVAL; | |
1932 | ||
1933 | v9ses = v9fs_inode2v9ses(dir); | |
1934 | dir_dentry = v9fs_dentry_from_dir_inode(dir); | |
01a622bd | 1935 | dfid = v9fs_fid_lookup(dir_dentry); |
4b43516a MK |
1936 | if (IS_ERR(dfid)) { |
1937 | err = PTR_ERR(dfid); | |
1938 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); | |
1939 | dfid = NULL; | |
1940 | goto error; | |
1941 | } | |
1942 | ||
1943 | gid = v9fs_get_fsgid_for_create(dir); | |
ad77dbce AK |
1944 | mode = omode; |
1945 | /* Update mode based on ACL value */ | |
1946 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); | |
1947 | if (err) { | |
1948 | P9_DPRINTK(P9_DEBUG_VFS, | |
1949 | "Failed to get acl values in mknod %d\n", err); | |
1950 | goto error; | |
1951 | } | |
4b43516a MK |
1952 | name = (char *) dentry->d_name.name; |
1953 | ||
1954 | err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); | |
1955 | if (err < 0) | |
1956 | goto error; | |
1957 | ||
1958 | /* instantiate inode and assign the unopened fid to the dentry */ | |
1959 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { | |
1960 | fid = p9_client_walk(dfid, 1, &name, 1); | |
1961 | if (IS_ERR(fid)) { | |
1962 | err = PTR_ERR(fid); | |
1963 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", | |
1964 | err); | |
1965 | fid = NULL; | |
1966 | goto error; | |
1967 | } | |
1968 | ||
1969 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
1970 | if (IS_ERR(inode)) { | |
1971 | err = PTR_ERR(inode); | |
1972 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", | |
1973 | err); | |
1974 | goto error; | |
1975 | } | |
1976 | dentry->d_op = &v9fs_cached_dentry_operations; | |
1977 | d_instantiate(dentry, inode); | |
1978 | err = v9fs_fid_add(dentry, fid); | |
1979 | if (err < 0) | |
1980 | goto error; | |
1981 | fid = NULL; | |
1982 | } else { | |
1983 | /* | |
1984 | * Not in cached mode. No need to populate inode with stat. | |
1985 | * socket syscall returns a fd, so we need instantiate | |
1986 | */ | |
1987 | inode = v9fs_get_inode(dir->i_sb, mode); | |
1988 | if (IS_ERR(inode)) { | |
1989 | err = PTR_ERR(inode); | |
1990 | goto error; | |
1991 | } | |
1992 | dentry->d_op = &v9fs_dentry_operations; | |
1993 | d_instantiate(dentry, inode); | |
1994 | } | |
ad77dbce AK |
1995 | /* Now set the ACL based on the default value */ |
1996 | v9fs_set_create_acl(dentry, dacl, pacl); | |
4b43516a MK |
1997 | error: |
1998 | if (fid) | |
1999 | p9_client_clunk(fid); | |
2000 | return err; | |
2001 | } | |
2002 | ||
329176cc MK |
2003 | static int |
2004 | v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen) | |
2005 | { | |
2006 | int retval; | |
2007 | struct p9_fid *fid; | |
2008 | char *target = NULL; | |
2009 | ||
2010 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); | |
2011 | retval = -EPERM; | |
2012 | fid = v9fs_fid_lookup(dentry); | |
2013 | if (IS_ERR(fid)) | |
2014 | return PTR_ERR(fid); | |
2015 | ||
2016 | retval = p9_client_readlink(fid, &target); | |
2017 | if (retval < 0) | |
2018 | return retval; | |
2019 | ||
2020 | strncpy(buffer, target, buflen); | |
2021 | P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer); | |
2022 | ||
2023 | retval = strnlen(buffer, buflen); | |
2024 | return retval; | |
2025 | } | |
2026 | ||
2027 | /** | |
2028 | * v9fs_vfs_follow_link_dotl - follow a symlink path | |
2029 | * @dentry: dentry for symlink | |
2030 | * @nd: nameidata | |
2031 | * | |
2032 | */ | |
2033 | ||
2034 | static void * | |
2035 | v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) | |
2036 | { | |
2037 | int len = 0; | |
2038 | char *link = __getname(); | |
2039 | ||
2040 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); | |
2041 | ||
2042 | if (!link) | |
2043 | link = ERR_PTR(-ENOMEM); | |
2044 | else { | |
2045 | len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX); | |
2046 | if (len < 0) { | |
2047 | __putname(link); | |
2048 | link = ERR_PTR(len); | |
2049 | } else | |
2050 | link[min(len, PATH_MAX-1)] = 0; | |
2051 | } | |
2052 | nd_set_link(nd, link); | |
2053 | ||
2054 | return NULL; | |
2055 | } | |
2056 | ||
9b6533c9 SK |
2057 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
2058 | .create = v9fs_vfs_create, | |
2059 | .lookup = v9fs_vfs_lookup, | |
2060 | .symlink = v9fs_vfs_symlink, | |
50cc42ff | 2061 | .link = v9fs_vfs_link, |
9b6533c9 SK |
2062 | .unlink = v9fs_vfs_unlink, |
2063 | .mkdir = v9fs_vfs_mkdir, | |
2064 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 2065 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
2066 | .rename = v9fs_vfs_rename, |
2067 | .getattr = v9fs_vfs_getattr, | |
2068 | .setattr = v9fs_vfs_setattr, | |
2069 | }; | |
2070 | ||
2071 | static const struct inode_operations v9fs_dir_inode_operations_dotl = { | |
5643135a | 2072 | .create = v9fs_vfs_create_dotl, |
2bad8471 | 2073 | .lookup = v9fs_vfs_lookup, |
50cc42ff VJJ |
2074 | .link = v9fs_vfs_link_dotl, |
2075 | .symlink = v9fs_vfs_symlink_dotl, | |
2bad8471 | 2076 | .unlink = v9fs_vfs_unlink, |
01a622bd | 2077 | .mkdir = v9fs_vfs_mkdir_dotl, |
2bad8471 | 2078 | .rmdir = v9fs_vfs_rmdir, |
4b43516a | 2079 | .mknod = v9fs_vfs_mknod_dotl, |
2bad8471 | 2080 | .rename = v9fs_vfs_rename, |
f0853122 | 2081 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2082 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2083 | .setxattr = generic_setxattr, |
2084 | .getxattr = generic_getxattr, | |
2085 | .removexattr = generic_removexattr, | |
2086 | .listxattr = v9fs_listxattr, | |
85ff872d | 2087 | .check_acl = v9fs_check_acl, |
2bad8471 EVH |
2088 | }; |
2089 | ||
754661f1 | 2090 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
2091 | .create = v9fs_vfs_create, |
2092 | .lookup = v9fs_vfs_lookup, | |
2093 | .unlink = v9fs_vfs_unlink, | |
2094 | .mkdir = v9fs_vfs_mkdir, | |
2095 | .rmdir = v9fs_vfs_rmdir, | |
2096 | .mknod = v9fs_vfs_mknod, | |
2097 | .rename = v9fs_vfs_rename, | |
2098 | .getattr = v9fs_vfs_getattr, | |
2099 | .setattr = v9fs_vfs_setattr, | |
2100 | }; | |
2101 | ||
754661f1 | 2102 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
2103 | .getattr = v9fs_vfs_getattr, |
2104 | .setattr = v9fs_vfs_setattr, | |
2105 | }; | |
2106 | ||
9b6533c9 | 2107 | static const struct inode_operations v9fs_file_inode_operations_dotl = { |
f0853122 | 2108 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2109 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2110 | .setxattr = generic_setxattr, |
2111 | .getxattr = generic_getxattr, | |
2112 | .removexattr = generic_removexattr, | |
2113 | .listxattr = v9fs_listxattr, | |
85ff872d | 2114 | .check_acl = v9fs_check_acl, |
9b6533c9 SK |
2115 | }; |
2116 | ||
754661f1 | 2117 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 2118 | .readlink = generic_readlink, |
2bad8471 EVH |
2119 | .follow_link = v9fs_vfs_follow_link, |
2120 | .put_link = v9fs_vfs_put_link, | |
2121 | .getattr = v9fs_vfs_getattr, | |
2122 | .setattr = v9fs_vfs_setattr, | |
2123 | }; | |
9b6533c9 SK |
2124 | |
2125 | static const struct inode_operations v9fs_symlink_inode_operations_dotl = { | |
329176cc MK |
2126 | .readlink = v9fs_vfs_readlink_dotl, |
2127 | .follow_link = v9fs_vfs_follow_link_dotl, | |
9b6533c9 | 2128 | .put_link = v9fs_vfs_put_link, |
f0853122 | 2129 | .getattr = v9fs_vfs_getattr_dotl, |
87d7845a | 2130 | .setattr = v9fs_vfs_setattr_dotl, |
ebf46264 AK |
2131 | .setxattr = generic_setxattr, |
2132 | .getxattr = generic_getxattr, | |
2133 | .removexattr = generic_removexattr, | |
2134 | .listxattr = v9fs_listxattr, | |
9b6533c9 | 2135 | }; |