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Commit | Line | Data |
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2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
2bad8471 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
2bad8471 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/namei.h> | |
35 | #include <linux/idr.h> | |
e8edc6e0 | 36 | #include <linux/sched.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
bd238fb4 LI |
38 | #include <net/9p/9p.h> |
39 | #include <net/9p/client.h> | |
2bad8471 | 40 | |
2bad8471 | 41 | #include "v9fs.h" |
2bad8471 | 42 | #include "v9fs_vfs.h" |
2bad8471 | 43 | #include "fid.h" |
60e78d2c | 44 | #include "cache.h" |
2bad8471 | 45 | |
754661f1 | 46 | static const struct inode_operations v9fs_dir_inode_operations; |
9b6533c9 SK |
47 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
48 | static const struct inode_operations v9fs_dir_inode_operations_dotl; | |
754661f1 | 49 | static const struct inode_operations v9fs_file_inode_operations; |
9b6533c9 | 50 | static const struct inode_operations v9fs_file_inode_operations_dotl; |
754661f1 | 51 | static const struct inode_operations v9fs_symlink_inode_operations; |
9b6533c9 | 52 | static const struct inode_operations v9fs_symlink_inode_operations_dotl; |
2bad8471 EVH |
53 | |
54 | /** | |
55 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
56 | * @v9ses: v9fs session information | |
57 | * @mode: mode to convert | |
58 | * | |
59 | */ | |
60 | ||
73c592b9 | 61 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
62 | { |
63 | int res; | |
64 | res = mode & 0777; | |
65 | if (S_ISDIR(mode)) | |
bd238fb4 | 66 | res |= P9_DMDIR; |
dd6102fb | 67 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 | 68 | if (S_ISLNK(mode)) |
bd238fb4 | 69 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
70 | if (v9ses->nodev == 0) { |
71 | if (S_ISSOCK(mode)) | |
bd238fb4 | 72 | res |= P9_DMSOCKET; |
2bad8471 | 73 | if (S_ISFIFO(mode)) |
bd238fb4 | 74 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 75 | if (S_ISBLK(mode)) |
bd238fb4 | 76 | res |= P9_DMDEVICE; |
2bad8471 | 77 | if (S_ISCHR(mode)) |
bd238fb4 | 78 | res |= P9_DMDEVICE; |
2bad8471 EVH |
79 | } |
80 | ||
81 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 82 | res |= P9_DMSETUID; |
2bad8471 | 83 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 84 | res |= P9_DMSETGID; |
d199d652 AL |
85 | if ((mode & S_ISVTX) == S_ISVTX) |
86 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
87 | if ((mode & P9_DMLINK)) |
88 | res |= P9_DMLINK; | |
2bad8471 EVH |
89 | } |
90 | ||
91 | return res; | |
92 | } | |
93 | ||
94 | /** | |
95 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
96 | * @v9ses: v9fs session information | |
97 | * @mode: mode to convert | |
98 | * | |
99 | */ | |
100 | ||
73c592b9 | 101 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
102 | { |
103 | int res; | |
104 | ||
105 | res = mode & 0777; | |
106 | ||
bd238fb4 | 107 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 108 | res |= S_IFDIR; |
dd6102fb | 109 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 110 | res |= S_IFLNK; |
dd6102fb | 111 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
112 | && (v9ses->nodev == 0)) |
113 | res |= S_IFSOCK; | |
dd6102fb | 114 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
115 | && (v9ses->nodev == 0)) |
116 | res |= S_IFIFO; | |
dd6102fb | 117 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
118 | && (v9ses->nodev == 0)) |
119 | res |= S_IFBLK; | |
120 | else | |
121 | res |= S_IFREG; | |
122 | ||
dd6102fb | 123 | if (v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 124 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
125 | res |= S_ISUID; |
126 | ||
bd238fb4 | 127 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 128 | res |= S_ISGID; |
d199d652 AL |
129 | |
130 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
131 | res |= S_ISVTX; | |
2bad8471 EVH |
132 | } |
133 | ||
134 | return res; | |
135 | } | |
136 | ||
ee443996 EVH |
137 | /** |
138 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
139 | * @uflags: flags to convert | |
2e4bef41 | 140 | * @extended: if .u extensions are active |
ee443996 EVH |
141 | */ |
142 | ||
2e4bef41 | 143 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
144 | { |
145 | int ret; | |
146 | ||
147 | ret = 0; | |
148 | switch (uflags&3) { | |
149 | default: | |
150 | case O_RDONLY: | |
bd238fb4 | 151 | ret = P9_OREAD; |
6a3124a3 LI |
152 | break; |
153 | ||
154 | case O_WRONLY: | |
bd238fb4 | 155 | ret = P9_OWRITE; |
6a3124a3 LI |
156 | break; |
157 | ||
158 | case O_RDWR: | |
bd238fb4 | 159 | ret = P9_ORDWR; |
6a3124a3 LI |
160 | break; |
161 | } | |
162 | ||
6a3124a3 | 163 | if (uflags & O_TRUNC) |
bd238fb4 | 164 | ret |= P9_OTRUNC; |
6a3124a3 | 165 | |
2e4bef41 EVH |
166 | if (extended) { |
167 | if (uflags & O_EXCL) | |
168 | ret |= P9_OEXCL; | |
169 | ||
170 | if (uflags & O_APPEND) | |
171 | ret |= P9_OAPPEND; | |
172 | } | |
6a3124a3 LI |
173 | |
174 | return ret; | |
175 | } | |
176 | ||
2bad8471 | 177 | /** |
531b1094 | 178 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 179 | * @wstat: structure to initialize |
2bad8471 EVH |
180 | * |
181 | */ | |
182 | ||
7a4439c4 | 183 | void |
bd238fb4 | 184 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 185 | { |
531b1094 LI |
186 | wstat->type = ~0; |
187 | wstat->dev = ~0; | |
188 | wstat->qid.type = ~0; | |
189 | wstat->qid.version = ~0; | |
190 | *((long long *)&wstat->qid.path) = ~0; | |
191 | wstat->mode = ~0; | |
192 | wstat->atime = ~0; | |
193 | wstat->mtime = ~0; | |
194 | wstat->length = ~0; | |
195 | wstat->name = NULL; | |
196 | wstat->uid = NULL; | |
197 | wstat->gid = NULL; | |
198 | wstat->muid = NULL; | |
199 | wstat->n_uid = ~0; | |
200 | wstat->n_gid = ~0; | |
201 | wstat->n_muid = ~0; | |
202 | wstat->extension = NULL; | |
2bad8471 EVH |
203 | } |
204 | ||
60e78d2c AK |
205 | #ifdef CONFIG_9P_FSCACHE |
206 | /** | |
207 | * v9fs_alloc_inode - helper function to allocate an inode | |
208 | * This callback is executed before setting up the inode so that we | |
209 | * can associate a vcookie with each inode. | |
210 | * | |
211 | */ | |
212 | ||
213 | struct inode *v9fs_alloc_inode(struct super_block *sb) | |
214 | { | |
215 | struct v9fs_cookie *vcookie; | |
216 | vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, | |
217 | GFP_KERNEL); | |
218 | if (!vcookie) | |
219 | return NULL; | |
220 | ||
221 | vcookie->fscache = NULL; | |
222 | vcookie->qid = NULL; | |
223 | spin_lock_init(&vcookie->lock); | |
224 | return &vcookie->inode; | |
225 | } | |
226 | ||
227 | /** | |
228 | * v9fs_destroy_inode - destroy an inode | |
229 | * | |
230 | */ | |
231 | ||
232 | void v9fs_destroy_inode(struct inode *inode) | |
233 | { | |
234 | kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); | |
235 | } | |
236 | #endif | |
237 | ||
2bad8471 EVH |
238 | /** |
239 | * v9fs_get_inode - helper function to setup an inode | |
240 | * @sb: superblock | |
241 | * @mode: mode to setup inode with | |
242 | * | |
243 | */ | |
244 | ||
245 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
246 | { | |
2bb54115 | 247 | int err; |
6a3124a3 | 248 | struct inode *inode; |
b501611a | 249 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 250 | |
bd238fb4 | 251 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
252 | |
253 | inode = new_inode(sb); | |
2bb54115 AK |
254 | if (!inode) { |
255 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
48559b4c | 256 | return ERR_PTR(-ENOMEM); |
2bb54115 AK |
257 | } |
258 | ||
217f206d | 259 | inode_init_owner(inode, NULL, mode); |
2bb54115 AK |
260 | inode->i_blocks = 0; |
261 | inode->i_rdev = 0; | |
262 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
263 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
264 | ||
265 | switch (mode & S_IFMT) { | |
266 | case S_IFIFO: | |
267 | case S_IFBLK: | |
268 | case S_IFCHR: | |
269 | case S_IFSOCK: | |
dd6102fb | 270 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 271 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
272 | "special files without extended mode\n"); |
273 | err = -EINVAL; | |
274 | goto error; | |
2bad8471 | 275 | } |
2bb54115 AK |
276 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
277 | break; | |
278 | case S_IFREG: | |
9b6533c9 SK |
279 | if (v9fs_proto_dotl(v9ses)) { |
280 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
281 | inode->i_fop = &v9fs_file_operations_dotl; | |
282 | } else { | |
283 | inode->i_op = &v9fs_file_inode_operations; | |
284 | inode->i_fop = &v9fs_file_operations; | |
285 | } | |
286 | ||
2bb54115 | 287 | break; |
9b6533c9 | 288 | |
2bb54115 | 289 | case S_IFLNK: |
9b6533c9 SK |
290 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
291 | P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " | |
292 | "legacy protocol.\n"); | |
2bb54115 AK |
293 | err = -EINVAL; |
294 | goto error; | |
295 | } | |
9b6533c9 SK |
296 | |
297 | if (v9fs_proto_dotl(v9ses)) | |
298 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
299 | else | |
300 | inode->i_op = &v9fs_symlink_inode_operations; | |
301 | ||
2bb54115 AK |
302 | break; |
303 | case S_IFDIR: | |
304 | inc_nlink(inode); | |
9b6533c9 SK |
305 | if (v9fs_proto_dotl(v9ses)) |
306 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
307 | else if (v9fs_proto_dotu(v9ses)) | |
308 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
309 | else |
310 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
311 | |
312 | if (v9fs_proto_dotl(v9ses)) | |
313 | inode->i_fop = &v9fs_dir_operations_dotl; | |
314 | else | |
315 | inode->i_fop = &v9fs_dir_operations; | |
316 | ||
2bb54115 AK |
317 | break; |
318 | default: | |
319 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
320 | mode, mode & S_IFMT); | |
321 | err = -EINVAL; | |
322 | goto error; | |
2bad8471 | 323 | } |
2bb54115 | 324 | |
2bad8471 | 325 | return inode; |
2bb54115 AK |
326 | |
327 | error: | |
328 | iput(inode); | |
329 | return ERR_PTR(err); | |
2bad8471 EVH |
330 | } |
331 | ||
bd238fb4 | 332 | /* |
6a3124a3 LI |
333 | static struct v9fs_fid* |
334 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
335 | { | |
336 | int err; | |
736c4b85 | 337 | int nfid; |
6a3124a3 LI |
338 | struct v9fs_fid *ret; |
339 | struct v9fs_fcall *fcall; | |
340 | ||
341 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
342 | if (nfid < 0) { | |
0b8dd177 | 343 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 344 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
345 | } |
346 | ||
6a3124a3 LI |
347 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
348 | &fcall); | |
349 | ||
350 | if (err < 0) { | |
41e5a6ac LI |
351 | if (fcall && fcall->id == RWALK) |
352 | goto clunk_fid; | |
353 | ||
6a3124a3 LI |
354 | PRINT_FCALL_ERROR("walk error", fcall); |
355 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
356 | goto error; | |
0b8dd177 | 357 | } |
6a3124a3 | 358 | |
3cf6429a LI |
359 | kfree(fcall); |
360 | fcall = NULL; | |
6a3124a3 LI |
361 | ret = v9fs_fid_create(v9ses, nfid); |
362 | if (!ret) { | |
363 | err = -ENOMEM; | |
364 | goto clunk_fid; | |
365 | } | |
0b8dd177 | 366 | |
6a3124a3 LI |
367 | err = v9fs_fid_insert(ret, dentry); |
368 | if (err < 0) { | |
369 | v9fs_fid_destroy(ret); | |
370 | goto clunk_fid; | |
0b8dd177 | 371 | } |
2bad8471 | 372 | |
6a3124a3 | 373 | return ret; |
2bad8471 | 374 | |
6a3124a3 LI |
375 | clunk_fid: |
376 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 377 | |
6a3124a3 LI |
378 | error: |
379 | kfree(fcall); | |
380 | return ERR_PTR(err); | |
381 | } | |
bd238fb4 | 382 | */ |
2bad8471 | 383 | |
60e78d2c AK |
384 | |
385 | /** | |
386 | * v9fs_clear_inode - release an inode | |
387 | * @inode: inode to release | |
388 | * | |
389 | */ | |
390 | void v9fs_clear_inode(struct inode *inode) | |
391 | { | |
392 | filemap_fdatawrite(inode->i_mapping); | |
393 | ||
394 | #ifdef CONFIG_9P_FSCACHE | |
395 | v9fs_cache_inode_put_cookie(inode); | |
396 | #endif | |
397 | } | |
398 | ||
ee443996 EVH |
399 | /** |
400 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
401 | * @v9ses: session information | |
402 | * @fid: fid to issue attribute request for | |
403 | * @sb: superblock on which to create inode | |
404 | * | |
405 | */ | |
406 | ||
5174fdab | 407 | static struct inode * |
bd238fb4 | 408 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
409 | struct super_block *sb) |
410 | { | |
411 | int err, umode; | |
412 | struct inode *ret; | |
51a87c55 | 413 | struct p9_wstat *st; |
531b1094 | 414 | |
6a3124a3 | 415 | ret = NULL; |
bd238fb4 | 416 | st = p9_client_stat(fid); |
02bc3567 AK |
417 | if (IS_ERR(st)) |
418 | return ERR_CAST(st); | |
2bad8471 | 419 | |
bd238fb4 | 420 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
421 | ret = v9fs_get_inode(sb, umode); |
422 | if (IS_ERR(ret)) { | |
423 | err = PTR_ERR(ret); | |
6a3124a3 LI |
424 | goto error; |
425 | } | |
2bad8471 | 426 | |
bd238fb4 LI |
427 | v9fs_stat2inode(st, ret, sb); |
428 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
429 | |
430 | #ifdef CONFIG_9P_FSCACHE | |
431 | v9fs_vcookie_set_qid(ret, &st->qid); | |
432 | v9fs_cache_inode_get_cookie(ret); | |
433 | #endif | |
02bc3567 | 434 | p9stat_free(st); |
bd238fb4 | 435 | kfree(st); |
60e78d2c | 436 | |
6a3124a3 | 437 | return ret; |
2bad8471 | 438 | |
6a3124a3 | 439 | error: |
02bc3567 | 440 | p9stat_free(st); |
bd238fb4 | 441 | kfree(st); |
6a3124a3 | 442 | return ERR_PTR(err); |
2bad8471 EVH |
443 | } |
444 | ||
445 | /** | |
446 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
447 | * @dir: directory inode that is being deleted |
448 | * @file: dentry that is being deleted | |
449 | * @rmdir: removing a directory | |
2bad8471 EVH |
450 | * |
451 | */ | |
452 | ||
453 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
454 | { | |
d994f405 | 455 | int retval; |
bd238fb4 | 456 | struct inode *file_inode; |
bd238fb4 | 457 | struct p9_fid *v9fid; |
2bad8471 | 458 | |
bd238fb4 | 459 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
460 | rmdir); |
461 | ||
462 | file_inode = file->d_inode; | |
c959df9f | 463 | v9fid = v9fs_fid_clone(file); |
ba17674f | 464 | if (IS_ERR(v9fid)) |
da977b2c | 465 | return PTR_ERR(v9fid); |
2bad8471 | 466 | |
d994f405 AK |
467 | retval = p9_client_remove(v9fid); |
468 | if (!retval) | |
469 | drop_nlink(file_inode); | |
470 | return retval; | |
2bad8471 EVH |
471 | } |
472 | ||
6a3124a3 LI |
473 | static int |
474 | v9fs_open_created(struct inode *inode, struct file *file) | |
475 | { | |
476 | return 0; | |
477 | } | |
478 | ||
bd238fb4 | 479 | |
2bad8471 | 480 | /** |
bd238fb4 | 481 | * v9fs_create - Create a file |
ee443996 EVH |
482 | * @v9ses: session information |
483 | * @dir: directory that dentry is being created in | |
bd238fb4 | 484 | * @dentry: dentry that is being created |
0e15597e | 485 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
486 | * @perm: create permissions |
487 | * @mode: open mode | |
2bad8471 EVH |
488 | * |
489 | */ | |
bd238fb4 LI |
490 | static struct p9_fid * |
491 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
492 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 493 | { |
6a3124a3 | 494 | int err; |
bd238fb4 LI |
495 | char *name; |
496 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 497 | struct inode *inode; |
6a3124a3 | 498 | |
51a87c55 EVH |
499 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
500 | ||
bd238fb4 LI |
501 | err = 0; |
502 | ofid = NULL; | |
503 | fid = NULL; | |
504 | name = (char *) dentry->d_name.name; | |
6d27e64d | 505 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 506 | if (IS_ERR(dfid)) { |
da977b2c | 507 | err = PTR_ERR(dfid); |
6d27e64d VJ |
508 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
509 | return ERR_PTR(err); | |
da977b2c | 510 | } |
6a3124a3 | 511 | |
bd238fb4 LI |
512 | /* clone a fid to use for creation */ |
513 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
514 | if (IS_ERR(ofid)) { | |
515 | err = PTR_ERR(ofid); | |
51a87c55 | 516 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 517 | return ERR_PTR(err); |
bd238fb4 | 518 | } |
6a3124a3 | 519 | |
bd238fb4 | 520 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
521 | if (err < 0) { |
522 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 523 | goto error; |
51a87c55 | 524 | } |
6a3124a3 | 525 | |
bd238fb4 | 526 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 527 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
528 | if (IS_ERR(fid)) { |
529 | err = PTR_ERR(fid); | |
51a87c55 | 530 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 531 | fid = NULL; |
6a3124a3 | 532 | goto error; |
6d27e64d | 533 | } |
6a3124a3 | 534 | |
bd238fb4 LI |
535 | /* instantiate inode and assign the unopened fid to the dentry */ |
536 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
537 | if (IS_ERR(inode)) { |
538 | err = PTR_ERR(inode); | |
51a87c55 | 539 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
540 | goto error; |
541 | } | |
542 | ||
ba17674f | 543 | if (v9ses->cache) |
e03abc0c EVH |
544 | dentry->d_op = &v9fs_cached_dentry_operations; |
545 | else | |
546 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 547 | |
6a3124a3 | 548 | d_instantiate(dentry, inode); |
50fb6d2b AK |
549 | err = v9fs_fid_add(dentry, fid); |
550 | if (err < 0) | |
551 | goto error; | |
552 | ||
bd238fb4 | 553 | return ofid; |
6a3124a3 | 554 | |
bd238fb4 | 555 | error: |
bd238fb4 LI |
556 | if (ofid) |
557 | p9_client_clunk(ofid); | |
558 | ||
559 | if (fid) | |
560 | p9_client_clunk(fid); | |
561 | ||
562 | return ERR_PTR(err); | |
563 | } | |
564 | ||
565 | /** | |
566 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 567 | * @dir: directory inode that is being created |
bd238fb4 LI |
568 | * @dentry: dentry that is being deleted |
569 | * @mode: create permissions | |
570 | * @nd: path information | |
571 | * | |
572 | */ | |
6a3124a3 | 573 | |
bd238fb4 LI |
574 | static int |
575 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
576 | struct nameidata *nd) | |
577 | { | |
578 | int err; | |
579 | u32 perm; | |
580 | int flags; | |
581 | struct v9fs_session_info *v9ses; | |
582 | struct p9_fid *fid; | |
583 | struct file *filp; | |
584 | ||
585 | err = 0; | |
586 | fid = NULL; | |
587 | v9ses = v9fs_inode2v9ses(dir); | |
588 | perm = unixmode2p9mode(v9ses, mode); | |
589 | if (nd && nd->flags & LOOKUP_OPEN) | |
590 | flags = nd->intent.open.flags - 1; | |
591 | else | |
592 | flags = O_RDWR; | |
593 | ||
594 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
595 | v9fs_uflags2omode(flags, |
596 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
597 | if (IS_ERR(fid)) { |
598 | err = PTR_ERR(fid); | |
599 | fid = NULL; | |
600 | goto error; | |
601 | } | |
602 | ||
603 | /* if we are opening a file, assign the open fid to the file */ | |
604 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
605 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
606 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
607 | err = PTR_ERR(filp); |
608 | goto error; | |
6a3124a3 LI |
609 | } |
610 | ||
bd238fb4 LI |
611 | filp->private_data = fid; |
612 | } else | |
613 | p9_client_clunk(fid); | |
6a3124a3 LI |
614 | |
615 | return 0; | |
616 | ||
617 | error: | |
bd238fb4 LI |
618 | if (fid) |
619 | p9_client_clunk(fid); | |
6a3124a3 | 620 | |
6a3124a3 | 621 | return err; |
2bad8471 EVH |
622 | } |
623 | ||
624 | /** | |
625 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 626 | * @dir: inode that is being unlinked |
2bad8471 EVH |
627 | * @dentry: dentry that is being unlinked |
628 | * @mode: mode for new directory | |
629 | * | |
630 | */ | |
631 | ||
6a3124a3 | 632 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 633 | { |
6a3124a3 | 634 | int err; |
bd238fb4 | 635 | u32 perm; |
6a3124a3 | 636 | struct v9fs_session_info *v9ses; |
bd238fb4 | 637 | struct p9_fid *fid; |
6a3124a3 | 638 | |
bd238fb4 LI |
639 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
640 | err = 0; | |
6a3124a3 | 641 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 642 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
643 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
644 | if (IS_ERR(fid)) { | |
645 | err = PTR_ERR(fid); | |
646 | fid = NULL; | |
6a3124a3 LI |
647 | } |
648 | ||
bd238fb4 LI |
649 | if (fid) |
650 | p9_client_clunk(fid); | |
6a3124a3 | 651 | |
6a3124a3 | 652 | return err; |
2bad8471 EVH |
653 | } |
654 | ||
655 | /** | |
656 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
657 | * @dir: inode that is being walked from | |
658 | * @dentry: dentry that is being walked to? | |
659 | * @nameidata: path data | |
660 | * | |
661 | */ | |
662 | ||
663 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
664 | struct nameidata *nameidata) | |
665 | { | |
666 | struct super_block *sb; | |
667 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 668 | struct p9_fid *dfid, *fid; |
2bad8471 | 669 | struct inode *inode; |
bd238fb4 | 670 | char *name; |
2bad8471 EVH |
671 | int result = 0; |
672 | ||
bd238fb4 | 673 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 674 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 675 | |
11e9b49b SK |
676 | if (dentry->d_name.len > NAME_MAX) |
677 | return ERR_PTR(-ENAMETOOLONG); | |
678 | ||
2bad8471 EVH |
679 | sb = dir->i_sb; |
680 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
681 | dfid = v9fs_fid_lookup(dentry->d_parent); |
682 | if (IS_ERR(dfid)) | |
e231c2ee | 683 | return ERR_CAST(dfid); |
bd238fb4 LI |
684 | |
685 | name = (char *) dentry->d_name.name; | |
686 | fid = p9_client_walk(dfid, 1, &name, 1); | |
687 | if (IS_ERR(fid)) { | |
688 | result = PTR_ERR(fid); | |
2bad8471 | 689 | if (result == -ENOENT) { |
85e0df24 AK |
690 | inode = NULL; |
691 | goto inst_out; | |
2bad8471 | 692 | } |
2bad8471 | 693 | |
bd238fb4 | 694 | return ERR_PTR(result); |
2bad8471 EVH |
695 | } |
696 | ||
bd238fb4 LI |
697 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
698 | if (IS_ERR(inode)) { | |
699 | result = PTR_ERR(inode); | |
700 | inode = NULL; | |
701 | goto error; | |
2bad8471 EVH |
702 | } |
703 | ||
bd238fb4 | 704 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 705 | if (result < 0) |
bd238fb4 | 706 | goto error; |
6a3124a3 | 707 | |
85e0df24 AK |
708 | inst_out: |
709 | if (v9ses->cache) | |
e03abc0c EVH |
710 | dentry->d_op = &v9fs_cached_dentry_operations; |
711 | else | |
712 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
713 | |
714 | d_add(dentry, inode); | |
2bad8471 EVH |
715 | return NULL; |
716 | ||
bd238fb4 | 717 | error: |
62aa528e | 718 | p9_client_clunk(fid); |
da977b2c | 719 | |
2bad8471 EVH |
720 | return ERR_PTR(result); |
721 | } | |
722 | ||
723 | /** | |
724 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
725 | * @i: inode that is being unlinked | |
73c592b9 | 726 | * @d: dentry that is being unlinked |
2bad8471 EVH |
727 | * |
728 | */ | |
729 | ||
730 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
731 | { | |
732 | return v9fs_remove(i, d, 0); | |
733 | } | |
734 | ||
735 | /** | |
736 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
737 | * @i: inode that is being unlinked | |
73c592b9 | 738 | * @d: dentry that is being unlinked |
2bad8471 EVH |
739 | * |
740 | */ | |
741 | ||
742 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
743 | { | |
744 | return v9fs_remove(i, d, 1); | |
745 | } | |
746 | ||
747 | /** | |
748 | * v9fs_vfs_rename - VFS hook to rename an inode | |
749 | * @old_dir: old dir inode | |
750 | * @old_dentry: old dentry | |
751 | * @new_dir: new dir inode | |
752 | * @new_dentry: new dentry | |
753 | * | |
754 | */ | |
755 | ||
756 | static int | |
757 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
758 | struct inode *new_dir, struct dentry *new_dentry) | |
759 | { | |
bd238fb4 LI |
760 | struct inode *old_inode; |
761 | struct v9fs_session_info *v9ses; | |
762 | struct p9_fid *oldfid; | |
763 | struct p9_fid *olddirfid; | |
764 | struct p9_fid *newdirfid; | |
765 | struct p9_wstat wstat; | |
766 | int retval; | |
2bad8471 | 767 | |
bd238fb4 LI |
768 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
769 | retval = 0; | |
770 | old_inode = old_dentry->d_inode; | |
771 | v9ses = v9fs_inode2v9ses(old_inode); | |
772 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 773 | if (IS_ERR(oldfid)) |
da977b2c EVH |
774 | return PTR_ERR(oldfid); |
775 | ||
776 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 777 | if (IS_ERR(olddirfid)) { |
da977b2c | 778 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 779 | goto done; |
da977b2c EVH |
780 | } |
781 | ||
782 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 783 | if (IS_ERR(newdirfid)) { |
da977b2c | 784 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 785 | goto clunk_olddir; |
2bad8471 EVH |
786 | } |
787 | ||
4681dbda SK |
788 | if (v9fs_proto_dotl(v9ses)) { |
789 | retval = p9_client_rename(oldfid, newdirfid, | |
790 | (char *) new_dentry->d_name.name); | |
791 | if (retval != -ENOSYS) | |
792 | goto clunk_newdir; | |
793 | } | |
794 | ||
2bad8471 EVH |
795 | /* 9P can only handle file rename in the same directory */ |
796 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
797 | P9_DPRINTK(P9_DEBUG_ERROR, |
798 | "old dir and new dir are different\n"); | |
621997cd | 799 | retval = -EXDEV; |
bd238fb4 | 800 | goto clunk_newdir; |
2bad8471 EVH |
801 | } |
802 | ||
531b1094 | 803 | v9fs_blank_wstat(&wstat); |
ba17674f | 804 | wstat.muid = v9ses->uname; |
531b1094 | 805 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 806 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 807 | |
bd238fb4 | 808 | clunk_newdir: |
22150c4f | 809 | p9_client_clunk(newdirfid); |
2bad8471 | 810 | |
bd238fb4 | 811 | clunk_olddir: |
22150c4f | 812 | p9_client_clunk(olddirfid); |
da977b2c | 813 | |
bd238fb4 | 814 | done: |
2bad8471 EVH |
815 | return retval; |
816 | } | |
817 | ||
818 | /** | |
943ffb58 | 819 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
820 | * @mnt: mount information |
821 | * @dentry: file to get attributes on | |
822 | * @stat: metadata structure to populate | |
2bad8471 EVH |
823 | * |
824 | */ | |
825 | ||
826 | static int | |
827 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
828 | struct kstat *stat) | |
829 | { | |
bd238fb4 LI |
830 | int err; |
831 | struct v9fs_session_info *v9ses; | |
832 | struct p9_fid *fid; | |
51a87c55 | 833 | struct p9_wstat *st; |
bd238fb4 LI |
834 | |
835 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
836 | err = -EPERM; | |
837 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 838 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
839 | return simple_getattr(mnt, dentry, stat); |
840 | ||
bd238fb4 LI |
841 | fid = v9fs_fid_lookup(dentry); |
842 | if (IS_ERR(fid)) | |
da977b2c | 843 | return PTR_ERR(fid); |
2bad8471 | 844 | |
bd238fb4 LI |
845 | st = p9_client_stat(fid); |
846 | if (IS_ERR(st)) | |
847 | return PTR_ERR(st); | |
2bad8471 | 848 | |
bd238fb4 | 849 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 850 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 851 | |
bd238fb4 LI |
852 | kfree(st); |
853 | return 0; | |
2bad8471 EVH |
854 | } |
855 | ||
856 | /** | |
857 | * v9fs_vfs_setattr - set file metadata | |
858 | * @dentry: file whose metadata to set | |
859 | * @iattr: metadata assignment structure | |
860 | * | |
861 | */ | |
862 | ||
863 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
864 | { | |
bd238fb4 LI |
865 | int retval; |
866 | struct v9fs_session_info *v9ses; | |
867 | struct p9_fid *fid; | |
868 | struct p9_wstat wstat; | |
2bad8471 | 869 | |
bd238fb4 LI |
870 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
871 | retval = -EPERM; | |
872 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
873 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
874 | if(IS_ERR(fid)) |
875 | return PTR_ERR(fid); | |
2bad8471 | 876 | |
531b1094 | 877 | v9fs_blank_wstat(&wstat); |
2bad8471 | 878 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 879 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
880 | |
881 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 882 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
883 | |
884 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 885 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
886 | |
887 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 888 | wstat.length = iattr->ia_size; |
2bad8471 | 889 | |
dd6102fb | 890 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
891 | if (iattr->ia_valid & ATTR_UID) |
892 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 893 | |
531b1094 LI |
894 | if (iattr->ia_valid & ATTR_GID) |
895 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
896 | } |
897 | ||
bd238fb4 | 898 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
899 | if (retval < 0) |
900 | return retval; | |
901 | ||
902 | if ((iattr->ia_valid & ATTR_SIZE) && | |
903 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
904 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
905 | if (retval) | |
906 | return retval; | |
907 | } | |
2bad8471 | 908 | |
1025774c CH |
909 | setattr_copy(dentry->d_inode, iattr); |
910 | mark_inode_dirty(dentry->d_inode); | |
911 | return 0; | |
2bad8471 EVH |
912 | } |
913 | ||
914 | /** | |
531b1094 LI |
915 | * v9fs_stat2inode - populate an inode structure with mistat info |
916 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
917 | * @inode: inode to populate |
918 | * @sb: superblock of filesystem | |
919 | * | |
920 | */ | |
921 | ||
922 | void | |
51a87c55 | 923 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 924 | struct super_block *sb) |
2bad8471 | 925 | { |
531b1094 | 926 | char ext[32]; |
5717144a AK |
927 | char tag_name[14]; |
928 | unsigned int i_nlink; | |
2bad8471 EVH |
929 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
930 | ||
931 | inode->i_nlink = 1; | |
932 | ||
531b1094 LI |
933 | inode->i_atime.tv_sec = stat->atime; |
934 | inode->i_mtime.tv_sec = stat->mtime; | |
935 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 936 | |
bd32b82d LI |
937 | inode->i_uid = v9ses->dfltuid; |
938 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 939 | |
dd6102fb | 940 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
941 | inode->i_uid = stat->n_uid; |
942 | inode->i_gid = stat->n_gid; | |
2bad8471 | 943 | } |
5717144a AK |
944 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
945 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
946 | /* | |
947 | * Hadlink support got added later to | |
948 | * to the .u extension. So there can be | |
949 | * server out there that doesn't support | |
950 | * this even with .u extension. So check | |
951 | * for non NULL stat->extension | |
952 | */ | |
953 | strncpy(ext, stat->extension, sizeof(ext)); | |
954 | /* HARDLINKCOUNT %u */ | |
955 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
956 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
957 | inode->i_nlink = i_nlink; | |
958 | } | |
959 | } | |
531b1094 | 960 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
961 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
962 | char type = 0; | |
963 | int major = -1; | |
964 | int minor = -1; | |
531b1094 | 965 | |
51a87c55 | 966 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 967 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
968 | switch (type) { |
969 | case 'c': | |
970 | inode->i_mode &= ~S_IFBLK; | |
971 | inode->i_mode |= S_IFCHR; | |
972 | break; | |
973 | case 'b': | |
974 | break; | |
975 | default: | |
bd238fb4 | 976 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
977 | "Unknown special type %c %s\n", type, |
978 | stat->extension); | |
2bad8471 EVH |
979 | }; |
980 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 981 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
982 | } else |
983 | inode->i_rdev = 0; | |
984 | ||
7549ae3e | 985 | i_size_write(inode, stat->length); |
2bad8471 | 986 | |
bd238fb4 | 987 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 988 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
989 | } |
990 | ||
991 | /** | |
992 | * v9fs_qid2ino - convert qid into inode number | |
993 | * @qid: qid to hash | |
994 | * | |
995 | * BUG: potential for inode number collisions? | |
996 | */ | |
997 | ||
bd238fb4 | 998 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
999 | { |
1000 | u64 path = qid->path + 2; | |
1001 | ino_t i = 0; | |
1002 | ||
1003 | if (sizeof(ino_t) == sizeof(path)) | |
1004 | memcpy(&i, &path, sizeof(ino_t)); | |
1005 | else | |
1006 | i = (ino_t) (path ^ (path >> 32)); | |
1007 | ||
1008 | return i; | |
1009 | } | |
1010 | ||
2bad8471 EVH |
1011 | /** |
1012 | * v9fs_readlink - read a symlink's location (internal version) | |
1013 | * @dentry: dentry for symlink | |
73c592b9 | 1014 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1015 | * @buflen: length of buffer |
1016 | * | |
1017 | */ | |
1018 | ||
1019 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1020 | { | |
bd238fb4 | 1021 | int retval; |
2bad8471 | 1022 | |
bd238fb4 LI |
1023 | struct v9fs_session_info *v9ses; |
1024 | struct p9_fid *fid; | |
51a87c55 | 1025 | struct p9_wstat *st; |
2bad8471 | 1026 | |
bd238fb4 LI |
1027 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1028 | retval = -EPERM; | |
1029 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1030 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1031 | if (IS_ERR(fid)) |
da977b2c | 1032 | return PTR_ERR(fid); |
2bad8471 | 1033 | |
dd6102fb | 1034 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1035 | return -EBADF; |
2bad8471 | 1036 | |
bd238fb4 LI |
1037 | st = p9_client_stat(fid); |
1038 | if (IS_ERR(st)) | |
1039 | return PTR_ERR(st); | |
2bad8471 | 1040 | |
bd238fb4 | 1041 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1042 | retval = -EINVAL; |
bd238fb4 | 1043 | goto done; |
2bad8471 EVH |
1044 | } |
1045 | ||
1046 | /* copy extension buffer into buffer */ | |
51a87c55 | 1047 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1048 | |
bd238fb4 | 1049 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1050 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1051 | |
2511cd0b | 1052 | retval = strnlen(buffer, buflen); |
bd238fb4 LI |
1053 | done: |
1054 | kfree(st); | |
2bad8471 EVH |
1055 | return retval; |
1056 | } | |
1057 | ||
2bad8471 EVH |
1058 | /** |
1059 | * v9fs_vfs_follow_link - follow a symlink path | |
1060 | * @dentry: dentry for symlink | |
1061 | * @nd: nameidata | |
1062 | * | |
1063 | */ | |
1064 | ||
1065 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1066 | { | |
1067 | int len = 0; | |
1068 | char *link = __getname(); | |
1069 | ||
bd238fb4 | 1070 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1071 | |
1072 | if (!link) | |
1073 | link = ERR_PTR(-ENOMEM); | |
1074 | else { | |
16cce6d2 | 1075 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1076 | |
1077 | if (len < 0) { | |
ce44eeb6 | 1078 | __putname(link); |
2bad8471 EVH |
1079 | link = ERR_PTR(len); |
1080 | } else | |
2511cd0b | 1081 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1082 | } |
1083 | nd_set_link(nd, link); | |
1084 | ||
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * v9fs_vfs_put_link - release a symlink path | |
1090 | * @dentry: dentry for symlink | |
1091 | * @nd: nameidata | |
ee443996 | 1092 | * @p: unused |
2bad8471 EVH |
1093 | * |
1094 | */ | |
1095 | ||
ee443996 EVH |
1096 | static void |
1097 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1098 | { |
1099 | char *s = nd_get_link(nd); | |
1100 | ||
6ff23207 DG |
1101 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1102 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1103 | if (!IS_ERR(s)) |
ce44eeb6 | 1104 | __putname(s); |
2bad8471 EVH |
1105 | } |
1106 | ||
ee443996 EVH |
1107 | /** |
1108 | * v9fs_vfs_mkspecial - create a special file | |
1109 | * @dir: inode to create special file in | |
1110 | * @dentry: dentry to create | |
1111 | * @mode: mode to create special file | |
1112 | * @extension: 9p2000.u format extension string representing special file | |
1113 | * | |
1114 | */ | |
1115 | ||
531b1094 LI |
1116 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1117 | int mode, const char *extension) | |
2bad8471 | 1118 | { |
bd238fb4 | 1119 | u32 perm; |
531b1094 | 1120 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1121 | struct p9_fid *fid; |
2bad8471 | 1122 | |
6a3124a3 | 1123 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1124 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1125 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1126 | return -EPERM; |
2bad8471 EVH |
1127 | } |
1128 | ||
da977b2c | 1129 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1130 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1131 | P9_OREAD); | |
1132 | if (IS_ERR(fid)) | |
1133 | return PTR_ERR(fid); | |
da977b2c | 1134 | |
bd238fb4 | 1135 | p9_client_clunk(fid); |
6a3124a3 | 1136 | return 0; |
531b1094 LI |
1137 | } |
1138 | ||
1139 | /** | |
1140 | * v9fs_vfs_symlink - helper function to create symlinks | |
1141 | * @dir: directory inode containing symlink | |
1142 | * @dentry: dentry for symlink | |
1143 | * @symname: symlink data | |
1144 | * | |
ee443996 | 1145 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1146 | * |
1147 | */ | |
1148 | ||
1149 | static int | |
1150 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1151 | { | |
bd238fb4 LI |
1152 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1153 | dentry->d_name.name, symname); | |
531b1094 LI |
1154 | |
1155 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * v9fs_vfs_link - create a hardlink | |
1160 | * @old_dentry: dentry for file to link to | |
1161 | * @dir: inode destination for new link | |
1162 | * @dentry: dentry for link | |
1163 | * | |
1164 | */ | |
1165 | ||
531b1094 LI |
1166 | static int |
1167 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1168 | struct dentry *dentry) | |
1169 | { | |
1170 | int retval; | |
bd238fb4 | 1171 | struct p9_fid *oldfid; |
531b1094 LI |
1172 | char *name; |
1173 | ||
bd238fb4 LI |
1174 | P9_DPRINTK(P9_DEBUG_VFS, |
1175 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1176 | old_dentry->d_name.name); |
1177 | ||
da977b2c | 1178 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1179 | if (IS_ERR(oldfid)) |
da977b2c | 1180 | return PTR_ERR(oldfid); |
531b1094 LI |
1181 | |
1182 | name = __getname(); | |
da977b2c EVH |
1183 | if (unlikely(!name)) { |
1184 | retval = -ENOMEM; | |
1185 | goto clunk_fid; | |
1186 | } | |
0710d36a | 1187 | |
16cce6d2 | 1188 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1189 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1190 | __putname(name); |
2bad8471 | 1191 | |
da977b2c | 1192 | clunk_fid: |
bd238fb4 | 1193 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1194 | return retval; |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * v9fs_vfs_mknod - create a special file | |
1199 | * @dir: inode destination for new link | |
1200 | * @dentry: dentry for file | |
1201 | * @mode: mode for creation | |
ee443996 | 1202 | * @rdev: device associated with special file |
2bad8471 EVH |
1203 | * |
1204 | */ | |
1205 | ||
1206 | static int | |
1207 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1208 | { | |
531b1094 LI |
1209 | int retval; |
1210 | char *name; | |
2bad8471 | 1211 | |
bd238fb4 LI |
1212 | P9_DPRINTK(P9_DEBUG_VFS, |
1213 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1214 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1215 | ||
531b1094 LI |
1216 | if (!new_valid_dev(rdev)) |
1217 | return -EINVAL; | |
2bad8471 | 1218 | |
531b1094 | 1219 | name = __getname(); |
c0291a05 ET |
1220 | if (!name) |
1221 | return -ENOMEM; | |
2bad8471 EVH |
1222 | /* build extension */ |
1223 | if (S_ISBLK(mode)) | |
531b1094 | 1224 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1225 | else if (S_ISCHR(mode)) |
531b1094 | 1226 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1227 | else if (S_ISFIFO(mode)) |
531b1094 | 1228 | *name = 0; |
75cc5c9b VJ |
1229 | else if (S_ISSOCK(mode)) |
1230 | *name = 0; | |
2bad8471 | 1231 | else { |
531b1094 LI |
1232 | __putname(name); |
1233 | return -EINVAL; | |
2bad8471 EVH |
1234 | } |
1235 | ||
531b1094 LI |
1236 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1237 | __putname(name); | |
2bad8471 EVH |
1238 | |
1239 | return retval; | |
1240 | } | |
1241 | ||
9b6533c9 SK |
1242 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1243 | .create = v9fs_vfs_create, | |
1244 | .lookup = v9fs_vfs_lookup, | |
1245 | .symlink = v9fs_vfs_symlink, | |
1246 | .link = v9fs_vfs_link, | |
1247 | .unlink = v9fs_vfs_unlink, | |
1248 | .mkdir = v9fs_vfs_mkdir, | |
1249 | .rmdir = v9fs_vfs_rmdir, | |
1250 | .mknod = v9fs_vfs_mknod, | |
1251 | .rename = v9fs_vfs_rename, | |
1252 | .getattr = v9fs_vfs_getattr, | |
1253 | .setattr = v9fs_vfs_setattr, | |
1254 | }; | |
1255 | ||
1256 | static const struct inode_operations v9fs_dir_inode_operations_dotl = { | |
2bad8471 EVH |
1257 | .create = v9fs_vfs_create, |
1258 | .lookup = v9fs_vfs_lookup, | |
1259 | .symlink = v9fs_vfs_symlink, | |
1260 | .link = v9fs_vfs_link, | |
1261 | .unlink = v9fs_vfs_unlink, | |
1262 | .mkdir = v9fs_vfs_mkdir, | |
1263 | .rmdir = v9fs_vfs_rmdir, | |
1264 | .mknod = v9fs_vfs_mknod, | |
1265 | .rename = v9fs_vfs_rename, | |
2bad8471 EVH |
1266 | .getattr = v9fs_vfs_getattr, |
1267 | .setattr = v9fs_vfs_setattr, | |
1268 | }; | |
1269 | ||
754661f1 | 1270 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1271 | .create = v9fs_vfs_create, |
1272 | .lookup = v9fs_vfs_lookup, | |
1273 | .unlink = v9fs_vfs_unlink, | |
1274 | .mkdir = v9fs_vfs_mkdir, | |
1275 | .rmdir = v9fs_vfs_rmdir, | |
1276 | .mknod = v9fs_vfs_mknod, | |
1277 | .rename = v9fs_vfs_rename, | |
1278 | .getattr = v9fs_vfs_getattr, | |
1279 | .setattr = v9fs_vfs_setattr, | |
1280 | }; | |
1281 | ||
754661f1 | 1282 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1283 | .getattr = v9fs_vfs_getattr, |
1284 | .setattr = v9fs_vfs_setattr, | |
1285 | }; | |
1286 | ||
9b6533c9 SK |
1287 | static const struct inode_operations v9fs_file_inode_operations_dotl = { |
1288 | .getattr = v9fs_vfs_getattr, | |
1289 | .setattr = v9fs_vfs_setattr, | |
1290 | }; | |
1291 | ||
754661f1 | 1292 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1293 | .readlink = generic_readlink, |
2bad8471 EVH |
1294 | .follow_link = v9fs_vfs_follow_link, |
1295 | .put_link = v9fs_vfs_put_link, | |
1296 | .getattr = v9fs_vfs_getattr, | |
1297 | .setattr = v9fs_vfs_setattr, | |
1298 | }; | |
9b6533c9 SK |
1299 | |
1300 | static const struct inode_operations v9fs_symlink_inode_operations_dotl = { | |
1301 | .readlink = generic_readlink, | |
1302 | .follow_link = v9fs_vfs_follow_link, | |
1303 | .put_link = v9fs_vfs_put_link, | |
1304 | .getattr = v9fs_vfs_getattr, | |
1305 | .setattr = v9fs_vfs_setattr, | |
1306 | }; |