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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 | */ | |
b57922d9 | 390 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 391 | { |
b57922d9 AV |
392 | truncate_inode_pages(inode->i_mapping, 0); |
393 | end_writeback(inode); | |
60e78d2c AK |
394 | filemap_fdatawrite(inode->i_mapping); |
395 | ||
396 | #ifdef CONFIG_9P_FSCACHE | |
397 | v9fs_cache_inode_put_cookie(inode); | |
398 | #endif | |
399 | } | |
400 | ||
ee443996 EVH |
401 | /** |
402 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
403 | * @v9ses: session information | |
404 | * @fid: fid to issue attribute request for | |
405 | * @sb: superblock on which to create inode | |
406 | * | |
407 | */ | |
408 | ||
5174fdab | 409 | static struct inode * |
bd238fb4 | 410 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
411 | struct super_block *sb) |
412 | { | |
413 | int err, umode; | |
414 | struct inode *ret; | |
51a87c55 | 415 | struct p9_wstat *st; |
531b1094 | 416 | |
6a3124a3 | 417 | ret = NULL; |
bd238fb4 | 418 | st = p9_client_stat(fid); |
02bc3567 AK |
419 | if (IS_ERR(st)) |
420 | return ERR_CAST(st); | |
2bad8471 | 421 | |
bd238fb4 | 422 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
423 | ret = v9fs_get_inode(sb, umode); |
424 | if (IS_ERR(ret)) { | |
425 | err = PTR_ERR(ret); | |
6a3124a3 LI |
426 | goto error; |
427 | } | |
2bad8471 | 428 | |
bd238fb4 LI |
429 | v9fs_stat2inode(st, ret, sb); |
430 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
60e78d2c AK |
431 | |
432 | #ifdef CONFIG_9P_FSCACHE | |
433 | v9fs_vcookie_set_qid(ret, &st->qid); | |
434 | v9fs_cache_inode_get_cookie(ret); | |
435 | #endif | |
02bc3567 | 436 | p9stat_free(st); |
bd238fb4 | 437 | kfree(st); |
60e78d2c | 438 | |
6a3124a3 | 439 | return ret; |
2bad8471 | 440 | |
6a3124a3 | 441 | error: |
02bc3567 | 442 | p9stat_free(st); |
bd238fb4 | 443 | kfree(st); |
6a3124a3 | 444 | return ERR_PTR(err); |
2bad8471 EVH |
445 | } |
446 | ||
447 | /** | |
448 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
449 | * @dir: directory inode that is being deleted |
450 | * @file: dentry that is being deleted | |
451 | * @rmdir: removing a directory | |
2bad8471 EVH |
452 | * |
453 | */ | |
454 | ||
455 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
456 | { | |
d994f405 | 457 | int retval; |
bd238fb4 | 458 | struct inode *file_inode; |
bd238fb4 | 459 | struct p9_fid *v9fid; |
2bad8471 | 460 | |
bd238fb4 | 461 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
462 | rmdir); |
463 | ||
464 | file_inode = file->d_inode; | |
c959df9f | 465 | v9fid = v9fs_fid_clone(file); |
ba17674f | 466 | if (IS_ERR(v9fid)) |
da977b2c | 467 | return PTR_ERR(v9fid); |
2bad8471 | 468 | |
d994f405 AK |
469 | retval = p9_client_remove(v9fid); |
470 | if (!retval) | |
471 | drop_nlink(file_inode); | |
472 | return retval; | |
2bad8471 EVH |
473 | } |
474 | ||
6a3124a3 LI |
475 | static int |
476 | v9fs_open_created(struct inode *inode, struct file *file) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
bd238fb4 | 481 | |
2bad8471 | 482 | /** |
bd238fb4 | 483 | * v9fs_create - Create a file |
ee443996 EVH |
484 | * @v9ses: session information |
485 | * @dir: directory that dentry is being created in | |
bd238fb4 | 486 | * @dentry: dentry that is being created |
0e15597e | 487 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
488 | * @perm: create permissions |
489 | * @mode: open mode | |
2bad8471 EVH |
490 | * |
491 | */ | |
bd238fb4 LI |
492 | static struct p9_fid * |
493 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
494 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 495 | { |
6a3124a3 | 496 | int err; |
bd238fb4 LI |
497 | char *name; |
498 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 499 | struct inode *inode; |
6a3124a3 | 500 | |
51a87c55 EVH |
501 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
502 | ||
bd238fb4 LI |
503 | err = 0; |
504 | ofid = NULL; | |
505 | fid = NULL; | |
506 | name = (char *) dentry->d_name.name; | |
6d27e64d | 507 | dfid = v9fs_fid_lookup(dentry->d_parent); |
ba17674f | 508 | if (IS_ERR(dfid)) { |
da977b2c | 509 | err = PTR_ERR(dfid); |
6d27e64d VJ |
510 | P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
511 | return ERR_PTR(err); | |
da977b2c | 512 | } |
6a3124a3 | 513 | |
bd238fb4 LI |
514 | /* clone a fid to use for creation */ |
515 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
516 | if (IS_ERR(ofid)) { | |
517 | err = PTR_ERR(ofid); | |
51a87c55 | 518 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
6d27e64d | 519 | return ERR_PTR(err); |
bd238fb4 | 520 | } |
6a3124a3 | 521 | |
bd238fb4 | 522 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
523 | if (err < 0) { |
524 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 525 | goto error; |
51a87c55 | 526 | } |
6a3124a3 | 527 | |
bd238fb4 | 528 | /* now walk from the parent so we can get unopened fid */ |
6d27e64d | 529 | fid = p9_client_walk(dfid, 1, &name, 1); |
bd238fb4 LI |
530 | if (IS_ERR(fid)) { |
531 | err = PTR_ERR(fid); | |
51a87c55 | 532 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 533 | fid = NULL; |
6a3124a3 | 534 | goto error; |
6d27e64d | 535 | } |
6a3124a3 | 536 | |
bd238fb4 LI |
537 | /* instantiate inode and assign the unopened fid to the dentry */ |
538 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
539 | if (IS_ERR(inode)) { |
540 | err = PTR_ERR(inode); | |
51a87c55 | 541 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
542 | goto error; |
543 | } | |
544 | ||
ba17674f | 545 | if (v9ses->cache) |
e03abc0c EVH |
546 | dentry->d_op = &v9fs_cached_dentry_operations; |
547 | else | |
548 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 549 | |
6a3124a3 | 550 | d_instantiate(dentry, inode); |
50fb6d2b AK |
551 | err = v9fs_fid_add(dentry, fid); |
552 | if (err < 0) | |
553 | goto error; | |
554 | ||
bd238fb4 | 555 | return ofid; |
6a3124a3 | 556 | |
bd238fb4 | 557 | error: |
bd238fb4 LI |
558 | if (ofid) |
559 | p9_client_clunk(ofid); | |
560 | ||
561 | if (fid) | |
562 | p9_client_clunk(fid); | |
563 | ||
564 | return ERR_PTR(err); | |
565 | } | |
566 | ||
567 | /** | |
568 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 569 | * @dir: directory inode that is being created |
bd238fb4 LI |
570 | * @dentry: dentry that is being deleted |
571 | * @mode: create permissions | |
572 | * @nd: path information | |
573 | * | |
574 | */ | |
6a3124a3 | 575 | |
bd238fb4 LI |
576 | static int |
577 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
578 | struct nameidata *nd) | |
579 | { | |
580 | int err; | |
581 | u32 perm; | |
582 | int flags; | |
583 | struct v9fs_session_info *v9ses; | |
584 | struct p9_fid *fid; | |
585 | struct file *filp; | |
586 | ||
587 | err = 0; | |
588 | fid = NULL; | |
589 | v9ses = v9fs_inode2v9ses(dir); | |
590 | perm = unixmode2p9mode(v9ses, mode); | |
591 | if (nd && nd->flags & LOOKUP_OPEN) | |
592 | flags = nd->intent.open.flags - 1; | |
593 | else | |
594 | flags = O_RDWR; | |
595 | ||
596 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
dd6102fb SK |
597 | v9fs_uflags2omode(flags, |
598 | v9fs_proto_dotu(v9ses))); | |
bd238fb4 LI |
599 | if (IS_ERR(fid)) { |
600 | err = PTR_ERR(fid); | |
601 | fid = NULL; | |
602 | goto error; | |
603 | } | |
604 | ||
605 | /* if we are opening a file, assign the open fid to the file */ | |
606 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
607 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
608 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
609 | err = PTR_ERR(filp); |
610 | goto error; | |
6a3124a3 LI |
611 | } |
612 | ||
bd238fb4 LI |
613 | filp->private_data = fid; |
614 | } else | |
615 | p9_client_clunk(fid); | |
6a3124a3 LI |
616 | |
617 | return 0; | |
618 | ||
619 | error: | |
bd238fb4 LI |
620 | if (fid) |
621 | p9_client_clunk(fid); | |
6a3124a3 | 622 | |
6a3124a3 | 623 | return err; |
2bad8471 EVH |
624 | } |
625 | ||
626 | /** | |
627 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 628 | * @dir: inode that is being unlinked |
2bad8471 EVH |
629 | * @dentry: dentry that is being unlinked |
630 | * @mode: mode for new directory | |
631 | * | |
632 | */ | |
633 | ||
6a3124a3 | 634 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 635 | { |
6a3124a3 | 636 | int err; |
bd238fb4 | 637 | u32 perm; |
6a3124a3 | 638 | struct v9fs_session_info *v9ses; |
bd238fb4 | 639 | struct p9_fid *fid; |
6a3124a3 | 640 | |
bd238fb4 LI |
641 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
642 | err = 0; | |
6a3124a3 | 643 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 644 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
645 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
646 | if (IS_ERR(fid)) { | |
647 | err = PTR_ERR(fid); | |
648 | fid = NULL; | |
6a3124a3 LI |
649 | } |
650 | ||
bd238fb4 LI |
651 | if (fid) |
652 | p9_client_clunk(fid); | |
6a3124a3 | 653 | |
6a3124a3 | 654 | return err; |
2bad8471 EVH |
655 | } |
656 | ||
657 | /** | |
658 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
659 | * @dir: inode that is being walked from | |
660 | * @dentry: dentry that is being walked to? | |
661 | * @nameidata: path data | |
662 | * | |
663 | */ | |
664 | ||
665 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
666 | struct nameidata *nameidata) | |
667 | { | |
668 | struct super_block *sb; | |
669 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 670 | struct p9_fid *dfid, *fid; |
2bad8471 | 671 | struct inode *inode; |
bd238fb4 | 672 | char *name; |
2bad8471 EVH |
673 | int result = 0; |
674 | ||
bd238fb4 | 675 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 676 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 | 677 | |
11e9b49b SK |
678 | if (dentry->d_name.len > NAME_MAX) |
679 | return ERR_PTR(-ENAMETOOLONG); | |
680 | ||
2bad8471 EVH |
681 | sb = dir->i_sb; |
682 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
683 | dfid = v9fs_fid_lookup(dentry->d_parent); |
684 | if (IS_ERR(dfid)) | |
e231c2ee | 685 | return ERR_CAST(dfid); |
bd238fb4 LI |
686 | |
687 | name = (char *) dentry->d_name.name; | |
688 | fid = p9_client_walk(dfid, 1, &name, 1); | |
689 | if (IS_ERR(fid)) { | |
690 | result = PTR_ERR(fid); | |
2bad8471 | 691 | if (result == -ENOENT) { |
85e0df24 AK |
692 | inode = NULL; |
693 | goto inst_out; | |
2bad8471 | 694 | } |
2bad8471 | 695 | |
bd238fb4 | 696 | return ERR_PTR(result); |
2bad8471 EVH |
697 | } |
698 | ||
bd238fb4 LI |
699 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
700 | if (IS_ERR(inode)) { | |
701 | result = PTR_ERR(inode); | |
702 | inode = NULL; | |
703 | goto error; | |
2bad8471 EVH |
704 | } |
705 | ||
bd238fb4 | 706 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 707 | if (result < 0) |
bd238fb4 | 708 | goto error; |
6a3124a3 | 709 | |
85e0df24 AK |
710 | inst_out: |
711 | if (v9ses->cache) | |
e03abc0c EVH |
712 | dentry->d_op = &v9fs_cached_dentry_operations; |
713 | else | |
714 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
715 | |
716 | d_add(dentry, inode); | |
2bad8471 EVH |
717 | return NULL; |
718 | ||
bd238fb4 | 719 | error: |
62aa528e | 720 | p9_client_clunk(fid); |
da977b2c | 721 | |
2bad8471 EVH |
722 | return ERR_PTR(result); |
723 | } | |
724 | ||
725 | /** | |
726 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
727 | * @i: inode that is being unlinked | |
73c592b9 | 728 | * @d: dentry that is being unlinked |
2bad8471 EVH |
729 | * |
730 | */ | |
731 | ||
732 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
733 | { | |
734 | return v9fs_remove(i, d, 0); | |
735 | } | |
736 | ||
737 | /** | |
738 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
739 | * @i: inode that is being unlinked | |
73c592b9 | 740 | * @d: dentry that is being unlinked |
2bad8471 EVH |
741 | * |
742 | */ | |
743 | ||
744 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
745 | { | |
746 | return v9fs_remove(i, d, 1); | |
747 | } | |
748 | ||
749 | /** | |
750 | * v9fs_vfs_rename - VFS hook to rename an inode | |
751 | * @old_dir: old dir inode | |
752 | * @old_dentry: old dentry | |
753 | * @new_dir: new dir inode | |
754 | * @new_dentry: new dentry | |
755 | * | |
756 | */ | |
757 | ||
758 | static int | |
759 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
760 | struct inode *new_dir, struct dentry *new_dentry) | |
761 | { | |
bd238fb4 LI |
762 | struct inode *old_inode; |
763 | struct v9fs_session_info *v9ses; | |
764 | struct p9_fid *oldfid; | |
765 | struct p9_fid *olddirfid; | |
766 | struct p9_fid *newdirfid; | |
767 | struct p9_wstat wstat; | |
768 | int retval; | |
2bad8471 | 769 | |
bd238fb4 LI |
770 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
771 | retval = 0; | |
772 | old_inode = old_dentry->d_inode; | |
773 | v9ses = v9fs_inode2v9ses(old_inode); | |
774 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 775 | if (IS_ERR(oldfid)) |
da977b2c EVH |
776 | return PTR_ERR(oldfid); |
777 | ||
778 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 779 | if (IS_ERR(olddirfid)) { |
da977b2c | 780 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 781 | goto done; |
da977b2c EVH |
782 | } |
783 | ||
784 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 785 | if (IS_ERR(newdirfid)) { |
da977b2c | 786 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 787 | goto clunk_olddir; |
2bad8471 EVH |
788 | } |
789 | ||
4681dbda SK |
790 | if (v9fs_proto_dotl(v9ses)) { |
791 | retval = p9_client_rename(oldfid, newdirfid, | |
792 | (char *) new_dentry->d_name.name); | |
793 | if (retval != -ENOSYS) | |
794 | goto clunk_newdir; | |
795 | } | |
796 | ||
2bad8471 EVH |
797 | /* 9P can only handle file rename in the same directory */ |
798 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
799 | P9_DPRINTK(P9_DEBUG_ERROR, |
800 | "old dir and new dir are different\n"); | |
621997cd | 801 | retval = -EXDEV; |
bd238fb4 | 802 | goto clunk_newdir; |
2bad8471 EVH |
803 | } |
804 | ||
531b1094 | 805 | v9fs_blank_wstat(&wstat); |
ba17674f | 806 | wstat.muid = v9ses->uname; |
531b1094 | 807 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 808 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 809 | |
bd238fb4 | 810 | clunk_newdir: |
22150c4f | 811 | p9_client_clunk(newdirfid); |
2bad8471 | 812 | |
bd238fb4 | 813 | clunk_olddir: |
22150c4f | 814 | p9_client_clunk(olddirfid); |
da977b2c | 815 | |
bd238fb4 | 816 | done: |
2bad8471 EVH |
817 | return retval; |
818 | } | |
819 | ||
820 | /** | |
943ffb58 | 821 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
822 | * @mnt: mount information |
823 | * @dentry: file to get attributes on | |
824 | * @stat: metadata structure to populate | |
2bad8471 EVH |
825 | * |
826 | */ | |
827 | ||
828 | static int | |
829 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
830 | struct kstat *stat) | |
831 | { | |
bd238fb4 LI |
832 | int err; |
833 | struct v9fs_session_info *v9ses; | |
834 | struct p9_fid *fid; | |
51a87c55 | 835 | struct p9_wstat *st; |
bd238fb4 LI |
836 | |
837 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
838 | err = -EPERM; | |
839 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
60e78d2c | 840 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
9523a841 EVH |
841 | return simple_getattr(mnt, dentry, stat); |
842 | ||
bd238fb4 LI |
843 | fid = v9fs_fid_lookup(dentry); |
844 | if (IS_ERR(fid)) | |
da977b2c | 845 | return PTR_ERR(fid); |
2bad8471 | 846 | |
bd238fb4 LI |
847 | st = p9_client_stat(fid); |
848 | if (IS_ERR(st)) | |
849 | return PTR_ERR(st); | |
2bad8471 | 850 | |
bd238fb4 | 851 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 852 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 853 | |
bd238fb4 LI |
854 | kfree(st); |
855 | return 0; | |
2bad8471 EVH |
856 | } |
857 | ||
858 | /** | |
859 | * v9fs_vfs_setattr - set file metadata | |
860 | * @dentry: file whose metadata to set | |
861 | * @iattr: metadata assignment structure | |
862 | * | |
863 | */ | |
864 | ||
865 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
866 | { | |
bd238fb4 LI |
867 | int retval; |
868 | struct v9fs_session_info *v9ses; | |
869 | struct p9_fid *fid; | |
870 | struct p9_wstat wstat; | |
2bad8471 | 871 | |
bd238fb4 LI |
872 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
873 | retval = -EPERM; | |
874 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
875 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
876 | if(IS_ERR(fid)) |
877 | return PTR_ERR(fid); | |
2bad8471 | 878 | |
531b1094 | 879 | v9fs_blank_wstat(&wstat); |
2bad8471 | 880 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 881 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
882 | |
883 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 884 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
885 | |
886 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 887 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
888 | |
889 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 890 | wstat.length = iattr->ia_size; |
2bad8471 | 891 | |
dd6102fb | 892 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
893 | if (iattr->ia_valid & ATTR_UID) |
894 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 895 | |
531b1094 LI |
896 | if (iattr->ia_valid & ATTR_GID) |
897 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
898 | } |
899 | ||
bd238fb4 | 900 | retval = p9_client_wstat(fid, &wstat); |
1025774c CH |
901 | if (retval < 0) |
902 | return retval; | |
903 | ||
904 | if ((iattr->ia_valid & ATTR_SIZE) && | |
905 | iattr->ia_size != i_size_read(dentry->d_inode)) { | |
906 | retval = vmtruncate(dentry->d_inode, iattr->ia_size); | |
907 | if (retval) | |
908 | return retval; | |
909 | } | |
2bad8471 | 910 | |
1025774c CH |
911 | setattr_copy(dentry->d_inode, iattr); |
912 | mark_inode_dirty(dentry->d_inode); | |
913 | return 0; | |
2bad8471 EVH |
914 | } |
915 | ||
916 | /** | |
531b1094 LI |
917 | * v9fs_stat2inode - populate an inode structure with mistat info |
918 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
919 | * @inode: inode to populate |
920 | * @sb: superblock of filesystem | |
921 | * | |
922 | */ | |
923 | ||
924 | void | |
51a87c55 | 925 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 926 | struct super_block *sb) |
2bad8471 | 927 | { |
531b1094 | 928 | char ext[32]; |
5717144a AK |
929 | char tag_name[14]; |
930 | unsigned int i_nlink; | |
2bad8471 EVH |
931 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
932 | ||
933 | inode->i_nlink = 1; | |
934 | ||
531b1094 LI |
935 | inode->i_atime.tv_sec = stat->atime; |
936 | inode->i_mtime.tv_sec = stat->mtime; | |
937 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 938 | |
bd32b82d LI |
939 | inode->i_uid = v9ses->dfltuid; |
940 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 941 | |
dd6102fb | 942 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
943 | inode->i_uid = stat->n_uid; |
944 | inode->i_gid = stat->n_gid; | |
2bad8471 | 945 | } |
5717144a AK |
946 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
947 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { | |
948 | /* | |
949 | * Hadlink support got added later to | |
950 | * to the .u extension. So there can be | |
951 | * server out there that doesn't support | |
952 | * this even with .u extension. So check | |
953 | * for non NULL stat->extension | |
954 | */ | |
955 | strncpy(ext, stat->extension, sizeof(ext)); | |
956 | /* HARDLINKCOUNT %u */ | |
957 | sscanf(ext, "%13s %u", tag_name, &i_nlink); | |
958 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) | |
959 | inode->i_nlink = i_nlink; | |
960 | } | |
961 | } | |
531b1094 | 962 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
963 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
964 | char type = 0; | |
965 | int major = -1; | |
966 | int minor = -1; | |
531b1094 | 967 | |
51a87c55 | 968 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 969 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
970 | switch (type) { |
971 | case 'c': | |
972 | inode->i_mode &= ~S_IFBLK; | |
973 | inode->i_mode |= S_IFCHR; | |
974 | break; | |
975 | case 'b': | |
976 | break; | |
977 | default: | |
bd238fb4 | 978 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
979 | "Unknown special type %c %s\n", type, |
980 | stat->extension); | |
2bad8471 EVH |
981 | }; |
982 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 983 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
984 | } else |
985 | inode->i_rdev = 0; | |
986 | ||
7549ae3e | 987 | i_size_write(inode, stat->length); |
2bad8471 | 988 | |
bd238fb4 | 989 | /* not real number of blocks, but 512 byte ones ... */ |
7549ae3e | 990 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
2bad8471 EVH |
991 | } |
992 | ||
993 | /** | |
994 | * v9fs_qid2ino - convert qid into inode number | |
995 | * @qid: qid to hash | |
996 | * | |
997 | * BUG: potential for inode number collisions? | |
998 | */ | |
999 | ||
bd238fb4 | 1000 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
1001 | { |
1002 | u64 path = qid->path + 2; | |
1003 | ino_t i = 0; | |
1004 | ||
1005 | if (sizeof(ino_t) == sizeof(path)) | |
1006 | memcpy(&i, &path, sizeof(ino_t)); | |
1007 | else | |
1008 | i = (ino_t) (path ^ (path >> 32)); | |
1009 | ||
1010 | return i; | |
1011 | } | |
1012 | ||
2bad8471 EVH |
1013 | /** |
1014 | * v9fs_readlink - read a symlink's location (internal version) | |
1015 | * @dentry: dentry for symlink | |
73c592b9 | 1016 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1017 | * @buflen: length of buffer |
1018 | * | |
1019 | */ | |
1020 | ||
1021 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1022 | { | |
bd238fb4 | 1023 | int retval; |
2bad8471 | 1024 | |
bd238fb4 LI |
1025 | struct v9fs_session_info *v9ses; |
1026 | struct p9_fid *fid; | |
51a87c55 | 1027 | struct p9_wstat *st; |
2bad8471 | 1028 | |
bd238fb4 LI |
1029 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
1030 | retval = -EPERM; | |
1031 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1032 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 1033 | if (IS_ERR(fid)) |
da977b2c | 1034 | return PTR_ERR(fid); |
2bad8471 | 1035 | |
dd6102fb | 1036 | if (!v9fs_proto_dotu(v9ses)) |
bd238fb4 | 1037 | return -EBADF; |
2bad8471 | 1038 | |
bd238fb4 LI |
1039 | st = p9_client_stat(fid); |
1040 | if (IS_ERR(st)) | |
1041 | return PTR_ERR(st); | |
2bad8471 | 1042 | |
bd238fb4 | 1043 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 1044 | retval = -EINVAL; |
bd238fb4 | 1045 | goto done; |
2bad8471 EVH |
1046 | } |
1047 | ||
1048 | /* copy extension buffer into buffer */ | |
51a87c55 | 1049 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 1050 | |
bd238fb4 | 1051 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 1052 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 1053 | |
2511cd0b | 1054 | retval = strnlen(buffer, buflen); |
bd238fb4 LI |
1055 | done: |
1056 | kfree(st); | |
2bad8471 EVH |
1057 | return retval; |
1058 | } | |
1059 | ||
2bad8471 EVH |
1060 | /** |
1061 | * v9fs_vfs_follow_link - follow a symlink path | |
1062 | * @dentry: dentry for symlink | |
1063 | * @nd: nameidata | |
1064 | * | |
1065 | */ | |
1066 | ||
1067 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1068 | { | |
1069 | int len = 0; | |
1070 | char *link = __getname(); | |
1071 | ||
bd238fb4 | 1072 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1073 | |
1074 | if (!link) | |
1075 | link = ERR_PTR(-ENOMEM); | |
1076 | else { | |
16cce6d2 | 1077 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1078 | |
1079 | if (len < 0) { | |
ce44eeb6 | 1080 | __putname(link); |
2bad8471 EVH |
1081 | link = ERR_PTR(len); |
1082 | } else | |
2511cd0b | 1083 | link[min(len, PATH_MAX-1)] = 0; |
2bad8471 EVH |
1084 | } |
1085 | nd_set_link(nd, link); | |
1086 | ||
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | /** | |
1091 | * v9fs_vfs_put_link - release a symlink path | |
1092 | * @dentry: dentry for symlink | |
1093 | * @nd: nameidata | |
ee443996 | 1094 | * @p: unused |
2bad8471 EVH |
1095 | * |
1096 | */ | |
1097 | ||
ee443996 EVH |
1098 | static void |
1099 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1100 | { |
1101 | char *s = nd_get_link(nd); | |
1102 | ||
6ff23207 DG |
1103 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1104 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1105 | if (!IS_ERR(s)) |
ce44eeb6 | 1106 | __putname(s); |
2bad8471 EVH |
1107 | } |
1108 | ||
ee443996 EVH |
1109 | /** |
1110 | * v9fs_vfs_mkspecial - create a special file | |
1111 | * @dir: inode to create special file in | |
1112 | * @dentry: dentry to create | |
1113 | * @mode: mode to create special file | |
1114 | * @extension: 9p2000.u format extension string representing special file | |
1115 | * | |
1116 | */ | |
1117 | ||
531b1094 LI |
1118 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1119 | int mode, const char *extension) | |
2bad8471 | 1120 | { |
bd238fb4 | 1121 | u32 perm; |
531b1094 | 1122 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1123 | struct p9_fid *fid; |
2bad8471 | 1124 | |
6a3124a3 | 1125 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1126 | if (!v9fs_proto_dotu(v9ses)) { |
bd238fb4 | 1127 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1128 | return -EPERM; |
2bad8471 EVH |
1129 | } |
1130 | ||
da977b2c | 1131 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1132 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1133 | P9_OREAD); | |
1134 | if (IS_ERR(fid)) | |
1135 | return PTR_ERR(fid); | |
da977b2c | 1136 | |
bd238fb4 | 1137 | p9_client_clunk(fid); |
6a3124a3 | 1138 | return 0; |
531b1094 LI |
1139 | } |
1140 | ||
1141 | /** | |
1142 | * v9fs_vfs_symlink - helper function to create symlinks | |
1143 | * @dir: directory inode containing symlink | |
1144 | * @dentry: dentry for symlink | |
1145 | * @symname: symlink data | |
1146 | * | |
ee443996 | 1147 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1148 | * |
1149 | */ | |
1150 | ||
1151 | static int | |
1152 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1153 | { | |
bd238fb4 LI |
1154 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1155 | dentry->d_name.name, symname); | |
531b1094 LI |
1156 | |
1157 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * v9fs_vfs_link - create a hardlink | |
1162 | * @old_dentry: dentry for file to link to | |
1163 | * @dir: inode destination for new link | |
1164 | * @dentry: dentry for link | |
1165 | * | |
1166 | */ | |
1167 | ||
531b1094 LI |
1168 | static int |
1169 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1170 | struct dentry *dentry) | |
1171 | { | |
1172 | int retval; | |
bd238fb4 | 1173 | struct p9_fid *oldfid; |
531b1094 LI |
1174 | char *name; |
1175 | ||
bd238fb4 LI |
1176 | P9_DPRINTK(P9_DEBUG_VFS, |
1177 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1178 | old_dentry->d_name.name); |
1179 | ||
da977b2c | 1180 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1181 | if (IS_ERR(oldfid)) |
da977b2c | 1182 | return PTR_ERR(oldfid); |
531b1094 LI |
1183 | |
1184 | name = __getname(); | |
da977b2c EVH |
1185 | if (unlikely(!name)) { |
1186 | retval = -ENOMEM; | |
1187 | goto clunk_fid; | |
1188 | } | |
0710d36a | 1189 | |
16cce6d2 | 1190 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1191 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1192 | __putname(name); |
2bad8471 | 1193 | |
da977b2c | 1194 | clunk_fid: |
bd238fb4 | 1195 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1196 | return retval; |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * v9fs_vfs_mknod - create a special file | |
1201 | * @dir: inode destination for new link | |
1202 | * @dentry: dentry for file | |
1203 | * @mode: mode for creation | |
ee443996 | 1204 | * @rdev: device associated with special file |
2bad8471 EVH |
1205 | * |
1206 | */ | |
1207 | ||
1208 | static int | |
1209 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1210 | { | |
531b1094 LI |
1211 | int retval; |
1212 | char *name; | |
2bad8471 | 1213 | |
bd238fb4 LI |
1214 | P9_DPRINTK(P9_DEBUG_VFS, |
1215 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1216 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1217 | ||
531b1094 LI |
1218 | if (!new_valid_dev(rdev)) |
1219 | return -EINVAL; | |
2bad8471 | 1220 | |
531b1094 | 1221 | name = __getname(); |
c0291a05 ET |
1222 | if (!name) |
1223 | return -ENOMEM; | |
2bad8471 EVH |
1224 | /* build extension */ |
1225 | if (S_ISBLK(mode)) | |
531b1094 | 1226 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1227 | else if (S_ISCHR(mode)) |
531b1094 | 1228 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1229 | else if (S_ISFIFO(mode)) |
531b1094 | 1230 | *name = 0; |
75cc5c9b VJ |
1231 | else if (S_ISSOCK(mode)) |
1232 | *name = 0; | |
2bad8471 | 1233 | else { |
531b1094 LI |
1234 | __putname(name); |
1235 | return -EINVAL; | |
2bad8471 EVH |
1236 | } |
1237 | ||
531b1094 LI |
1238 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1239 | __putname(name); | |
2bad8471 EVH |
1240 | |
1241 | return retval; | |
1242 | } | |
1243 | ||
9b6533c9 SK |
1244 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1245 | .create = v9fs_vfs_create, | |
1246 | .lookup = v9fs_vfs_lookup, | |
1247 | .symlink = v9fs_vfs_symlink, | |
1248 | .link = v9fs_vfs_link, | |
1249 | .unlink = v9fs_vfs_unlink, | |
1250 | .mkdir = v9fs_vfs_mkdir, | |
1251 | .rmdir = v9fs_vfs_rmdir, | |
1252 | .mknod = v9fs_vfs_mknod, | |
1253 | .rename = v9fs_vfs_rename, | |
1254 | .getattr = v9fs_vfs_getattr, | |
1255 | .setattr = v9fs_vfs_setattr, | |
1256 | }; | |
1257 | ||
1258 | static const struct inode_operations v9fs_dir_inode_operations_dotl = { | |
2bad8471 EVH |
1259 | .create = v9fs_vfs_create, |
1260 | .lookup = v9fs_vfs_lookup, | |
1261 | .symlink = v9fs_vfs_symlink, | |
1262 | .link = v9fs_vfs_link, | |
1263 | .unlink = v9fs_vfs_unlink, | |
1264 | .mkdir = v9fs_vfs_mkdir, | |
1265 | .rmdir = v9fs_vfs_rmdir, | |
1266 | .mknod = v9fs_vfs_mknod, | |
1267 | .rename = v9fs_vfs_rename, | |
2bad8471 EVH |
1268 | .getattr = v9fs_vfs_getattr, |
1269 | .setattr = v9fs_vfs_setattr, | |
1270 | }; | |
1271 | ||
754661f1 | 1272 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1273 | .create = v9fs_vfs_create, |
1274 | .lookup = v9fs_vfs_lookup, | |
1275 | .unlink = v9fs_vfs_unlink, | |
1276 | .mkdir = v9fs_vfs_mkdir, | |
1277 | .rmdir = v9fs_vfs_rmdir, | |
1278 | .mknod = v9fs_vfs_mknod, | |
1279 | .rename = v9fs_vfs_rename, | |
1280 | .getattr = v9fs_vfs_getattr, | |
1281 | .setattr = v9fs_vfs_setattr, | |
1282 | }; | |
1283 | ||
754661f1 | 1284 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1285 | .getattr = v9fs_vfs_getattr, |
1286 | .setattr = v9fs_vfs_setattr, | |
1287 | }; | |
1288 | ||
9b6533c9 SK |
1289 | static const struct inode_operations v9fs_file_inode_operations_dotl = { |
1290 | .getattr = v9fs_vfs_getattr, | |
1291 | .setattr = v9fs_vfs_setattr, | |
1292 | }; | |
1293 | ||
754661f1 | 1294 | static const struct inode_operations v9fs_symlink_inode_operations = { |
204f2f0e | 1295 | .readlink = generic_readlink, |
2bad8471 EVH |
1296 | .follow_link = v9fs_vfs_follow_link, |
1297 | .put_link = v9fs_vfs_put_link, | |
1298 | .getattr = v9fs_vfs_getattr, | |
1299 | .setattr = v9fs_vfs_setattr, | |
1300 | }; | |
9b6533c9 SK |
1301 | |
1302 | static const struct inode_operations v9fs_symlink_inode_operations_dotl = { | |
1303 | .readlink = generic_readlink, | |
1304 | .follow_link = v9fs_vfs_follow_link, | |
1305 | .put_link = v9fs_vfs_put_link, | |
1306 | .getattr = v9fs_vfs_getattr, | |
1307 | .setattr = v9fs_vfs_setattr, | |
1308 | }; |