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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> |
bd238fb4 LI |
37 | #include <net/9p/9p.h> |
38 | #include <net/9p/client.h> | |
2bad8471 | 39 | |
2bad8471 | 40 | #include "v9fs.h" |
2bad8471 | 41 | #include "v9fs_vfs.h" |
2bad8471 EVH |
42 | #include "fid.h" |
43 | ||
754661f1 AV |
44 | static const struct inode_operations v9fs_dir_inode_operations; |
45 | static const struct inode_operations v9fs_dir_inode_operations_ext; | |
46 | static const struct inode_operations v9fs_file_inode_operations; | |
47 | static const struct inode_operations v9fs_symlink_inode_operations; | |
2bad8471 EVH |
48 | |
49 | /** | |
50 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
51 | * @v9ses: v9fs session information | |
52 | * @mode: mode to convert | |
53 | * | |
54 | */ | |
55 | ||
73c592b9 | 56 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
57 | { |
58 | int res; | |
59 | res = mode & 0777; | |
60 | if (S_ISDIR(mode)) | |
bd238fb4 | 61 | res |= P9_DMDIR; |
2405669b | 62 | if (v9fs_extended(v9ses)) { |
2bad8471 | 63 | if (S_ISLNK(mode)) |
bd238fb4 | 64 | res |= P9_DMSYMLINK; |
2bad8471 EVH |
65 | if (v9ses->nodev == 0) { |
66 | if (S_ISSOCK(mode)) | |
bd238fb4 | 67 | res |= P9_DMSOCKET; |
2bad8471 | 68 | if (S_ISFIFO(mode)) |
bd238fb4 | 69 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 70 | if (S_ISBLK(mode)) |
bd238fb4 | 71 | res |= P9_DMDEVICE; |
2bad8471 | 72 | if (S_ISCHR(mode)) |
bd238fb4 | 73 | res |= P9_DMDEVICE; |
2bad8471 EVH |
74 | } |
75 | ||
76 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 77 | res |= P9_DMSETUID; |
2bad8471 | 78 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 79 | res |= P9_DMSETGID; |
d199d652 AL |
80 | if ((mode & S_ISVTX) == S_ISVTX) |
81 | res |= P9_DMSETVTX; | |
bd238fb4 LI |
82 | if ((mode & P9_DMLINK)) |
83 | res |= P9_DMLINK; | |
2bad8471 EVH |
84 | } |
85 | ||
86 | return res; | |
87 | } | |
88 | ||
89 | /** | |
90 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
91 | * @v9ses: v9fs session information | |
92 | * @mode: mode to convert | |
93 | * | |
94 | */ | |
95 | ||
73c592b9 | 96 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
97 | { |
98 | int res; | |
99 | ||
100 | res = mode & 0777; | |
101 | ||
bd238fb4 | 102 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 103 | res |= S_IFDIR; |
2405669b | 104 | else if ((mode & P9_DMSYMLINK) && (v9fs_extended(v9ses))) |
2bad8471 | 105 | res |= S_IFLNK; |
2405669b | 106 | else if ((mode & P9_DMSOCKET) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
107 | && (v9ses->nodev == 0)) |
108 | res |= S_IFSOCK; | |
2405669b | 109 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
110 | && (v9ses->nodev == 0)) |
111 | res |= S_IFIFO; | |
2405669b | 112 | else if ((mode & P9_DMDEVICE) && (v9fs_extended(v9ses)) |
2bad8471 EVH |
113 | && (v9ses->nodev == 0)) |
114 | res |= S_IFBLK; | |
115 | else | |
116 | res |= S_IFREG; | |
117 | ||
2405669b | 118 | if (v9fs_extended(v9ses)) { |
bd238fb4 | 119 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
2bad8471 EVH |
120 | res |= S_ISUID; |
121 | ||
bd238fb4 | 122 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
2bad8471 | 123 | res |= S_ISGID; |
d199d652 AL |
124 | |
125 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
126 | res |= S_ISVTX; | |
2bad8471 EVH |
127 | } |
128 | ||
129 | return res; | |
130 | } | |
131 | ||
ee443996 EVH |
132 | /** |
133 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
134 | * @uflags: flags to convert | |
2e4bef41 | 135 | * @extended: if .u extensions are active |
ee443996 EVH |
136 | */ |
137 | ||
2e4bef41 | 138 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
139 | { |
140 | int ret; | |
141 | ||
142 | ret = 0; | |
143 | switch (uflags&3) { | |
144 | default: | |
145 | case O_RDONLY: | |
bd238fb4 | 146 | ret = P9_OREAD; |
6a3124a3 LI |
147 | break; |
148 | ||
149 | case O_WRONLY: | |
bd238fb4 | 150 | ret = P9_OWRITE; |
6a3124a3 LI |
151 | break; |
152 | ||
153 | case O_RDWR: | |
bd238fb4 | 154 | ret = P9_ORDWR; |
6a3124a3 LI |
155 | break; |
156 | } | |
157 | ||
6a3124a3 | 158 | if (uflags & O_TRUNC) |
bd238fb4 | 159 | ret |= P9_OTRUNC; |
6a3124a3 | 160 | |
2e4bef41 EVH |
161 | if (extended) { |
162 | if (uflags & O_EXCL) | |
163 | ret |= P9_OEXCL; | |
164 | ||
165 | if (uflags & O_APPEND) | |
166 | ret |= P9_OAPPEND; | |
167 | } | |
6a3124a3 LI |
168 | |
169 | return ret; | |
170 | } | |
171 | ||
2bad8471 | 172 | /** |
531b1094 | 173 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 174 | * @wstat: structure to initialize |
2bad8471 EVH |
175 | * |
176 | */ | |
177 | ||
73c592b9 | 178 | static void |
bd238fb4 | 179 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 180 | { |
531b1094 LI |
181 | wstat->type = ~0; |
182 | wstat->dev = ~0; | |
183 | wstat->qid.type = ~0; | |
184 | wstat->qid.version = ~0; | |
185 | *((long long *)&wstat->qid.path) = ~0; | |
186 | wstat->mode = ~0; | |
187 | wstat->atime = ~0; | |
188 | wstat->mtime = ~0; | |
189 | wstat->length = ~0; | |
190 | wstat->name = NULL; | |
191 | wstat->uid = NULL; | |
192 | wstat->gid = NULL; | |
193 | wstat->muid = NULL; | |
194 | wstat->n_uid = ~0; | |
195 | wstat->n_gid = ~0; | |
196 | wstat->n_muid = ~0; | |
197 | wstat->extension = NULL; | |
2bad8471 EVH |
198 | } |
199 | ||
200 | /** | |
201 | * v9fs_get_inode - helper function to setup an inode | |
202 | * @sb: superblock | |
203 | * @mode: mode to setup inode with | |
204 | * | |
205 | */ | |
206 | ||
207 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
208 | { | |
2bb54115 | 209 | int err; |
6a3124a3 | 210 | struct inode *inode; |
b501611a | 211 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 | 212 | |
bd238fb4 | 213 | P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
2bad8471 EVH |
214 | |
215 | inode = new_inode(sb); | |
2bb54115 AK |
216 | if (!inode) { |
217 | P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); | |
218 | return -ENOMEM; | |
219 | } | |
220 | ||
221 | inode->i_mode = mode; | |
222 | inode->i_uid = current_fsuid(); | |
223 | inode->i_gid = current_fsgid(); | |
224 | inode->i_blocks = 0; | |
225 | inode->i_rdev = 0; | |
226 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
227 | inode->i_mapping->a_ops = &v9fs_addr_operations; | |
228 | ||
229 | switch (mode & S_IFMT) { | |
230 | case S_IFIFO: | |
231 | case S_IFBLK: | |
232 | case S_IFCHR: | |
233 | case S_IFSOCK: | |
234 | if (!v9fs_extended(v9ses)) { | |
bd238fb4 | 235 | P9_DPRINTK(P9_DEBUG_ERROR, |
2bb54115 AK |
236 | "special files without extended mode\n"); |
237 | err = -EINVAL; | |
238 | goto error; | |
2bad8471 | 239 | } |
2bb54115 AK |
240 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
241 | break; | |
242 | case S_IFREG: | |
243 | inode->i_op = &v9fs_file_inode_operations; | |
244 | inode->i_fop = &v9fs_file_operations; | |
245 | break; | |
246 | case S_IFLNK: | |
247 | if (!v9fs_extended(v9ses)) { | |
248 | P9_DPRINTK(P9_DEBUG_ERROR, | |
249 | "extended modes used w/o 9P2000.u\n"); | |
250 | err = -EINVAL; | |
251 | goto error; | |
252 | } | |
253 | inode->i_op = &v9fs_symlink_inode_operations; | |
254 | break; | |
255 | case S_IFDIR: | |
256 | inc_nlink(inode); | |
257 | if (v9fs_extended(v9ses)) | |
258 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
259 | else | |
260 | inode->i_op = &v9fs_dir_inode_operations; | |
261 | inode->i_fop = &v9fs_dir_operations; | |
262 | break; | |
263 | default: | |
264 | P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
265 | mode, mode & S_IFMT); | |
266 | err = -EINVAL; | |
267 | goto error; | |
2bad8471 | 268 | } |
2bb54115 | 269 | |
2bad8471 | 270 | return inode; |
2bb54115 AK |
271 | |
272 | error: | |
273 | iput(inode); | |
274 | return ERR_PTR(err); | |
2bad8471 EVH |
275 | } |
276 | ||
bd238fb4 | 277 | /* |
6a3124a3 LI |
278 | static struct v9fs_fid* |
279 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) | |
280 | { | |
281 | int err; | |
736c4b85 | 282 | int nfid; |
6a3124a3 LI |
283 | struct v9fs_fid *ret; |
284 | struct v9fs_fcall *fcall; | |
285 | ||
286 | nfid = v9fs_get_idpool(&v9ses->fidpool); | |
287 | if (nfid < 0) { | |
0b8dd177 | 288 | eprintk(KERN_WARNING, "no free fids available\n"); |
731805b4 | 289 | return ERR_PTR(-ENOSPC); |
0b8dd177 LI |
290 | } |
291 | ||
6a3124a3 LI |
292 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
293 | &fcall); | |
294 | ||
295 | if (err < 0) { | |
41e5a6ac LI |
296 | if (fcall && fcall->id == RWALK) |
297 | goto clunk_fid; | |
298 | ||
6a3124a3 LI |
299 | PRINT_FCALL_ERROR("walk error", fcall); |
300 | v9fs_put_idpool(nfid, &v9ses->fidpool); | |
301 | goto error; | |
0b8dd177 | 302 | } |
6a3124a3 | 303 | |
3cf6429a LI |
304 | kfree(fcall); |
305 | fcall = NULL; | |
6a3124a3 LI |
306 | ret = v9fs_fid_create(v9ses, nfid); |
307 | if (!ret) { | |
308 | err = -ENOMEM; | |
309 | goto clunk_fid; | |
310 | } | |
0b8dd177 | 311 | |
6a3124a3 LI |
312 | err = v9fs_fid_insert(ret, dentry); |
313 | if (err < 0) { | |
314 | v9fs_fid_destroy(ret); | |
315 | goto clunk_fid; | |
0b8dd177 | 316 | } |
2bad8471 | 317 | |
6a3124a3 | 318 | return ret; |
2bad8471 | 319 | |
6a3124a3 LI |
320 | clunk_fid: |
321 | v9fs_t_clunk(v9ses, nfid); | |
2bad8471 | 322 | |
6a3124a3 LI |
323 | error: |
324 | kfree(fcall); | |
325 | return ERR_PTR(err); | |
326 | } | |
bd238fb4 | 327 | */ |
2bad8471 | 328 | |
ee443996 EVH |
329 | /** |
330 | * v9fs_inode_from_fid - populate an inode by issuing a attribute request | |
331 | * @v9ses: session information | |
332 | * @fid: fid to issue attribute request for | |
333 | * @sb: superblock on which to create inode | |
334 | * | |
335 | */ | |
336 | ||
5174fdab | 337 | static struct inode * |
bd238fb4 | 338 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
6a3124a3 LI |
339 | struct super_block *sb) |
340 | { | |
341 | int err, umode; | |
342 | struct inode *ret; | |
51a87c55 | 343 | struct p9_wstat *st; |
531b1094 | 344 | |
6a3124a3 | 345 | ret = NULL; |
bd238fb4 LI |
346 | st = p9_client_stat(fid); |
347 | if (IS_ERR(st)) { | |
348 | err = PTR_ERR(st); | |
349 | st = NULL; | |
6a3124a3 | 350 | goto error; |
2bad8471 EVH |
351 | } |
352 | ||
bd238fb4 | 353 | umode = p9mode2unixmode(v9ses, st->mode); |
6a3124a3 LI |
354 | ret = v9fs_get_inode(sb, umode); |
355 | if (IS_ERR(ret)) { | |
356 | err = PTR_ERR(ret); | |
357 | ret = NULL; | |
358 | goto error; | |
359 | } | |
2bad8471 | 360 | |
bd238fb4 LI |
361 | v9fs_stat2inode(st, ret, sb); |
362 | ret->i_ino = v9fs_qid2ino(&st->qid); | |
363 | kfree(st); | |
6a3124a3 | 364 | return ret; |
2bad8471 | 365 | |
6a3124a3 | 366 | error: |
bd238fb4 | 367 | kfree(st); |
6a3124a3 LI |
368 | if (ret) |
369 | iput(ret); | |
2bad8471 | 370 | |
6a3124a3 | 371 | return ERR_PTR(err); |
2bad8471 EVH |
372 | } |
373 | ||
374 | /** | |
375 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
376 | * @dir: directory inode that is being deleted |
377 | * @file: dentry that is being deleted | |
378 | * @rmdir: removing a directory | |
2bad8471 EVH |
379 | * |
380 | */ | |
381 | ||
382 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
383 | { | |
bd238fb4 LI |
384 | struct inode *file_inode; |
385 | struct v9fs_session_info *v9ses; | |
386 | struct p9_fid *v9fid; | |
2bad8471 | 387 | |
bd238fb4 | 388 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
2bad8471 EVH |
389 | rmdir); |
390 | ||
391 | file_inode = file->d_inode; | |
2bad8471 | 392 | v9ses = v9fs_inode2v9ses(file_inode); |
c959df9f | 393 | v9fid = v9fs_fid_clone(file); |
ba17674f | 394 | if (IS_ERR(v9fid)) |
da977b2c | 395 | return PTR_ERR(v9fid); |
2bad8471 | 396 | |
bd238fb4 | 397 | return p9_client_remove(v9fid); |
2bad8471 EVH |
398 | } |
399 | ||
6a3124a3 LI |
400 | static int |
401 | v9fs_open_created(struct inode *inode, struct file *file) | |
402 | { | |
403 | return 0; | |
404 | } | |
405 | ||
bd238fb4 | 406 | |
2bad8471 | 407 | /** |
bd238fb4 | 408 | * v9fs_create - Create a file |
ee443996 EVH |
409 | * @v9ses: session information |
410 | * @dir: directory that dentry is being created in | |
bd238fb4 | 411 | * @dentry: dentry that is being created |
0e15597e | 412 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
413 | * @perm: create permissions |
414 | * @mode: open mode | |
2bad8471 EVH |
415 | * |
416 | */ | |
bd238fb4 LI |
417 | static struct p9_fid * |
418 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
419 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 420 | { |
6a3124a3 | 421 | int err; |
bd238fb4 LI |
422 | char *name; |
423 | struct p9_fid *dfid, *ofid, *fid; | |
6a3124a3 | 424 | struct inode *inode; |
6a3124a3 | 425 | |
51a87c55 EVH |
426 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
427 | ||
bd238fb4 LI |
428 | err = 0; |
429 | ofid = NULL; | |
430 | fid = NULL; | |
431 | name = (char *) dentry->d_name.name; | |
da977b2c | 432 | dfid = v9fs_fid_clone(dentry->d_parent); |
ba17674f | 433 | if (IS_ERR(dfid)) { |
da977b2c | 434 | err = PTR_ERR(dfid); |
51a87c55 | 435 | P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); |
bd238fb4 | 436 | dfid = NULL; |
da977b2c EVH |
437 | goto error; |
438 | } | |
6a3124a3 | 439 | |
bd238fb4 LI |
440 | /* clone a fid to use for creation */ |
441 | ofid = p9_client_walk(dfid, 0, NULL, 1); | |
442 | if (IS_ERR(ofid)) { | |
443 | err = PTR_ERR(ofid); | |
51a87c55 | 444 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 LI |
445 | ofid = NULL; |
446 | goto error; | |
447 | } | |
6a3124a3 | 448 | |
bd238fb4 | 449 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 EVH |
450 | if (err < 0) { |
451 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); | |
bd238fb4 | 452 | goto error; |
51a87c55 | 453 | } |
6a3124a3 | 454 | |
bd238fb4 LI |
455 | /* now walk from the parent so we can get unopened fid */ |
456 | fid = p9_client_walk(dfid, 1, &name, 0); | |
457 | if (IS_ERR(fid)) { | |
458 | err = PTR_ERR(fid); | |
51a87c55 | 459 | P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
bd238fb4 | 460 | fid = NULL; |
6a3124a3 | 461 | goto error; |
bd238fb4 LI |
462 | } else |
463 | dfid = NULL; | |
6a3124a3 | 464 | |
bd238fb4 LI |
465 | /* instantiate inode and assign the unopened fid to the dentry */ |
466 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); | |
6a3124a3 LI |
467 | if (IS_ERR(inode)) { |
468 | err = PTR_ERR(inode); | |
51a87c55 | 469 | P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
6a3124a3 LI |
470 | goto error; |
471 | } | |
472 | ||
ba17674f | 473 | if (v9ses->cache) |
e03abc0c EVH |
474 | dentry->d_op = &v9fs_cached_dentry_operations; |
475 | else | |
476 | dentry->d_op = &v9fs_dentry_operations; | |
bd238fb4 | 477 | |
6a3124a3 | 478 | d_instantiate(dentry, inode); |
50fb6d2b AK |
479 | err = v9fs_fid_add(dentry, fid); |
480 | if (err < 0) | |
481 | goto error; | |
482 | ||
bd238fb4 | 483 | return ofid; |
6a3124a3 | 484 | |
bd238fb4 LI |
485 | error: |
486 | if (dfid) | |
487 | p9_client_clunk(dfid); | |
488 | ||
489 | if (ofid) | |
490 | p9_client_clunk(ofid); | |
491 | ||
492 | if (fid) | |
493 | p9_client_clunk(fid); | |
494 | ||
495 | return ERR_PTR(err); | |
496 | } | |
497 | ||
498 | /** | |
499 | * v9fs_vfs_create - VFS hook to create files | |
ee443996 | 500 | * @dir: directory inode that is being created |
bd238fb4 LI |
501 | * @dentry: dentry that is being deleted |
502 | * @mode: create permissions | |
503 | * @nd: path information | |
504 | * | |
505 | */ | |
6a3124a3 | 506 | |
bd238fb4 LI |
507 | static int |
508 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
509 | struct nameidata *nd) | |
510 | { | |
511 | int err; | |
512 | u32 perm; | |
513 | int flags; | |
514 | struct v9fs_session_info *v9ses; | |
515 | struct p9_fid *fid; | |
516 | struct file *filp; | |
517 | ||
518 | err = 0; | |
519 | fid = NULL; | |
520 | v9ses = v9fs_inode2v9ses(dir); | |
521 | perm = unixmode2p9mode(v9ses, mode); | |
522 | if (nd && nd->flags & LOOKUP_OPEN) | |
523 | flags = nd->intent.open.flags - 1; | |
524 | else | |
525 | flags = O_RDWR; | |
526 | ||
527 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, | |
2e4bef41 | 528 | v9fs_uflags2omode(flags, v9fs_extended(v9ses))); |
bd238fb4 LI |
529 | if (IS_ERR(fid)) { |
530 | err = PTR_ERR(fid); | |
531 | fid = NULL; | |
532 | goto error; | |
533 | } | |
534 | ||
535 | /* if we are opening a file, assign the open fid to the file */ | |
536 | if (nd && nd->flags & LOOKUP_OPEN) { | |
6a3124a3 LI |
537 | filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
538 | if (IS_ERR(filp)) { | |
bd238fb4 LI |
539 | err = PTR_ERR(filp); |
540 | goto error; | |
6a3124a3 LI |
541 | } |
542 | ||
bd238fb4 LI |
543 | filp->private_data = fid; |
544 | } else | |
545 | p9_client_clunk(fid); | |
6a3124a3 LI |
546 | |
547 | return 0; | |
548 | ||
549 | error: | |
bd238fb4 LI |
550 | if (fid) |
551 | p9_client_clunk(fid); | |
6a3124a3 | 552 | |
6a3124a3 | 553 | return err; |
2bad8471 EVH |
554 | } |
555 | ||
556 | /** | |
557 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
ee443996 | 558 | * @dir: inode that is being unlinked |
2bad8471 EVH |
559 | * @dentry: dentry that is being unlinked |
560 | * @mode: mode for new directory | |
561 | * | |
562 | */ | |
563 | ||
6a3124a3 | 564 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2bad8471 | 565 | { |
6a3124a3 | 566 | int err; |
bd238fb4 | 567 | u32 perm; |
6a3124a3 | 568 | struct v9fs_session_info *v9ses; |
bd238fb4 | 569 | struct p9_fid *fid; |
6a3124a3 | 570 | |
bd238fb4 LI |
571 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
572 | err = 0; | |
6a3124a3 | 573 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 574 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
575 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
576 | if (IS_ERR(fid)) { | |
577 | err = PTR_ERR(fid); | |
578 | fid = NULL; | |
6a3124a3 LI |
579 | } |
580 | ||
bd238fb4 LI |
581 | if (fid) |
582 | p9_client_clunk(fid); | |
6a3124a3 | 583 | |
6a3124a3 | 584 | return err; |
2bad8471 EVH |
585 | } |
586 | ||
587 | /** | |
588 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
589 | * @dir: inode that is being walked from | |
590 | * @dentry: dentry that is being walked to? | |
591 | * @nameidata: path data | |
592 | * | |
593 | */ | |
594 | ||
595 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
596 | struct nameidata *nameidata) | |
597 | { | |
598 | struct super_block *sb; | |
599 | struct v9fs_session_info *v9ses; | |
bd238fb4 | 600 | struct p9_fid *dfid, *fid; |
2bad8471 | 601 | struct inode *inode; |
bd238fb4 | 602 | char *name; |
2bad8471 EVH |
603 | int result = 0; |
604 | ||
bd238fb4 | 605 | P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
731805b4 | 606 | dir, dentry->d_name.name, dentry, nameidata); |
2bad8471 EVH |
607 | |
608 | sb = dir->i_sb; | |
609 | v9ses = v9fs_inode2v9ses(dir); | |
bd238fb4 LI |
610 | dfid = v9fs_fid_lookup(dentry->d_parent); |
611 | if (IS_ERR(dfid)) | |
e231c2ee | 612 | return ERR_CAST(dfid); |
bd238fb4 LI |
613 | |
614 | name = (char *) dentry->d_name.name; | |
615 | fid = p9_client_walk(dfid, 1, &name, 1); | |
616 | if (IS_ERR(fid)) { | |
617 | result = PTR_ERR(fid); | |
2bad8471 EVH |
618 | if (result == -ENOENT) { |
619 | d_add(dentry, NULL); | |
2bad8471 EVH |
620 | return NULL; |
621 | } | |
2bad8471 | 622 | |
bd238fb4 | 623 | return ERR_PTR(result); |
2bad8471 EVH |
624 | } |
625 | ||
bd238fb4 LI |
626 | inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
627 | if (IS_ERR(inode)) { | |
628 | result = PTR_ERR(inode); | |
629 | inode = NULL; | |
630 | goto error; | |
2bad8471 EVH |
631 | } |
632 | ||
bd238fb4 | 633 | result = v9fs_fid_add(dentry, fid); |
6a3124a3 | 634 | if (result < 0) |
bd238fb4 | 635 | goto error; |
6a3124a3 | 636 | |
ba17674f | 637 | if ((fid->qid.version) && (v9ses->cache)) |
e03abc0c EVH |
638 | dentry->d_op = &v9fs_cached_dentry_operations; |
639 | else | |
640 | dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
641 | |
642 | d_add(dentry, inode); | |
2bad8471 EVH |
643 | return NULL; |
644 | ||
bd238fb4 | 645 | error: |
62aa528e | 646 | p9_client_clunk(fid); |
da977b2c | 647 | |
2bad8471 EVH |
648 | return ERR_PTR(result); |
649 | } | |
650 | ||
651 | /** | |
652 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
653 | * @i: inode that is being unlinked | |
73c592b9 | 654 | * @d: dentry that is being unlinked |
2bad8471 EVH |
655 | * |
656 | */ | |
657 | ||
658 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
659 | { | |
660 | return v9fs_remove(i, d, 0); | |
661 | } | |
662 | ||
663 | /** | |
664 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
665 | * @i: inode that is being unlinked | |
73c592b9 | 666 | * @d: dentry that is being unlinked |
2bad8471 EVH |
667 | * |
668 | */ | |
669 | ||
670 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
671 | { | |
672 | return v9fs_remove(i, d, 1); | |
673 | } | |
674 | ||
675 | /** | |
676 | * v9fs_vfs_rename - VFS hook to rename an inode | |
677 | * @old_dir: old dir inode | |
678 | * @old_dentry: old dentry | |
679 | * @new_dir: new dir inode | |
680 | * @new_dentry: new dentry | |
681 | * | |
682 | */ | |
683 | ||
684 | static int | |
685 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
686 | struct inode *new_dir, struct dentry *new_dentry) | |
687 | { | |
bd238fb4 LI |
688 | struct inode *old_inode; |
689 | struct v9fs_session_info *v9ses; | |
690 | struct p9_fid *oldfid; | |
691 | struct p9_fid *olddirfid; | |
692 | struct p9_fid *newdirfid; | |
693 | struct p9_wstat wstat; | |
694 | int retval; | |
2bad8471 | 695 | |
bd238fb4 LI |
696 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
697 | retval = 0; | |
698 | old_inode = old_dentry->d_inode; | |
699 | v9ses = v9fs_inode2v9ses(old_inode); | |
700 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 701 | if (IS_ERR(oldfid)) |
da977b2c EVH |
702 | return PTR_ERR(oldfid); |
703 | ||
704 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); | |
ba17674f | 705 | if (IS_ERR(olddirfid)) { |
da977b2c | 706 | retval = PTR_ERR(olddirfid); |
bd238fb4 | 707 | goto done; |
da977b2c EVH |
708 | } |
709 | ||
710 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); | |
ba17674f | 711 | if (IS_ERR(newdirfid)) { |
da977b2c | 712 | retval = PTR_ERR(newdirfid); |
bd238fb4 | 713 | goto clunk_olddir; |
2bad8471 EVH |
714 | } |
715 | ||
716 | /* 9P can only handle file rename in the same directory */ | |
717 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
bd238fb4 LI |
718 | P9_DPRINTK(P9_DEBUG_ERROR, |
719 | "old dir and new dir are different\n"); | |
621997cd | 720 | retval = -EXDEV; |
bd238fb4 | 721 | goto clunk_newdir; |
2bad8471 EVH |
722 | } |
723 | ||
531b1094 | 724 | v9fs_blank_wstat(&wstat); |
ba17674f | 725 | wstat.muid = v9ses->uname; |
531b1094 | 726 | wstat.name = (char *) new_dentry->d_name.name; |
bd238fb4 | 727 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 728 | |
bd238fb4 | 729 | clunk_newdir: |
22150c4f | 730 | p9_client_clunk(newdirfid); |
2bad8471 | 731 | |
bd238fb4 | 732 | clunk_olddir: |
22150c4f | 733 | p9_client_clunk(olddirfid); |
da977b2c | 734 | |
bd238fb4 | 735 | done: |
2bad8471 EVH |
736 | return retval; |
737 | } | |
738 | ||
739 | /** | |
943ffb58 | 740 | * v9fs_vfs_getattr - retrieve file metadata |
ee443996 EVH |
741 | * @mnt: mount information |
742 | * @dentry: file to get attributes on | |
743 | * @stat: metadata structure to populate | |
2bad8471 EVH |
744 | * |
745 | */ | |
746 | ||
747 | static int | |
748 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
749 | struct kstat *stat) | |
750 | { | |
bd238fb4 LI |
751 | int err; |
752 | struct v9fs_session_info *v9ses; | |
753 | struct p9_fid *fid; | |
51a87c55 | 754 | struct p9_wstat *st; |
bd238fb4 LI |
755 | |
756 | P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); | |
757 | err = -EPERM; | |
758 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
9523a841 EVH |
759 | if (v9ses->cache == CACHE_LOOSE) |
760 | return simple_getattr(mnt, dentry, stat); | |
761 | ||
bd238fb4 LI |
762 | fid = v9fs_fid_lookup(dentry); |
763 | if (IS_ERR(fid)) | |
da977b2c | 764 | return PTR_ERR(fid); |
2bad8471 | 765 | |
bd238fb4 LI |
766 | st = p9_client_stat(fid); |
767 | if (IS_ERR(st)) | |
768 | return PTR_ERR(st); | |
2bad8471 | 769 | |
bd238fb4 | 770 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
2bad8471 | 771 | generic_fillattr(dentry->d_inode, stat); |
2bad8471 | 772 | |
bd238fb4 LI |
773 | kfree(st); |
774 | return 0; | |
2bad8471 EVH |
775 | } |
776 | ||
777 | /** | |
778 | * v9fs_vfs_setattr - set file metadata | |
779 | * @dentry: file whose metadata to set | |
780 | * @iattr: metadata assignment structure | |
781 | * | |
782 | */ | |
783 | ||
784 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
785 | { | |
bd238fb4 LI |
786 | int retval; |
787 | struct v9fs_session_info *v9ses; | |
788 | struct p9_fid *fid; | |
789 | struct p9_wstat wstat; | |
2bad8471 | 790 | |
bd238fb4 LI |
791 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
792 | retval = -EPERM; | |
793 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
794 | fid = v9fs_fid_lookup(dentry); | |
da977b2c EVH |
795 | if(IS_ERR(fid)) |
796 | return PTR_ERR(fid); | |
2bad8471 | 797 | |
531b1094 | 798 | v9fs_blank_wstat(&wstat); |
2bad8471 | 799 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 800 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
801 | |
802 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 803 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
804 | |
805 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 806 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
807 | |
808 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 809 | wstat.length = iattr->ia_size; |
2bad8471 | 810 | |
2405669b | 811 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
812 | if (iattr->ia_valid & ATTR_UID) |
813 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 814 | |
531b1094 LI |
815 | if (iattr->ia_valid & ATTR_GID) |
816 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 EVH |
817 | } |
818 | ||
bd238fb4 LI |
819 | retval = p9_client_wstat(fid, &wstat); |
820 | if (retval >= 0) | |
821 | retval = inode_setattr(dentry->d_inode, iattr); | |
2bad8471 | 822 | |
bd238fb4 | 823 | return retval; |
2bad8471 EVH |
824 | } |
825 | ||
826 | /** | |
531b1094 LI |
827 | * v9fs_stat2inode - populate an inode structure with mistat info |
828 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
829 | * @inode: inode to populate |
830 | * @sb: superblock of filesystem | |
831 | * | |
832 | */ | |
833 | ||
834 | void | |
51a87c55 | 835 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
531b1094 | 836 | struct super_block *sb) |
2bad8471 | 837 | { |
531b1094 | 838 | char ext[32]; |
2bad8471 EVH |
839 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
840 | ||
841 | inode->i_nlink = 1; | |
842 | ||
531b1094 LI |
843 | inode->i_atime.tv_sec = stat->atime; |
844 | inode->i_mtime.tv_sec = stat->mtime; | |
845 | inode->i_ctime.tv_sec = stat->mtime; | |
2bad8471 | 846 | |
bd32b82d LI |
847 | inode->i_uid = v9ses->dfltuid; |
848 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 849 | |
2405669b | 850 | if (v9fs_extended(v9ses)) { |
531b1094 LI |
851 | inode->i_uid = stat->n_uid; |
852 | inode->i_gid = stat->n_gid; | |
2bad8471 EVH |
853 | } |
854 | ||
531b1094 | 855 | inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
2bad8471 EVH |
856 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
857 | char type = 0; | |
858 | int major = -1; | |
859 | int minor = -1; | |
531b1094 | 860 | |
51a87c55 | 861 | strncpy(ext, stat->extension, sizeof(ext)); |
531b1094 | 862 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
2bad8471 EVH |
863 | switch (type) { |
864 | case 'c': | |
865 | inode->i_mode &= ~S_IFBLK; | |
866 | inode->i_mode |= S_IFCHR; | |
867 | break; | |
868 | case 'b': | |
869 | break; | |
870 | default: | |
bd238fb4 | 871 | P9_DPRINTK(P9_DEBUG_ERROR, |
51a87c55 EVH |
872 | "Unknown special type %c %s\n", type, |
873 | stat->extension); | |
2bad8471 EVH |
874 | }; |
875 | inode->i_rdev = MKDEV(major, minor); | |
57c7b4e6 | 876 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
2bad8471 EVH |
877 | } else |
878 | inode->i_rdev = 0; | |
879 | ||
531b1094 | 880 | inode->i_size = stat->length; |
2bad8471 | 881 | |
bd238fb4 LI |
882 | /* not real number of blocks, but 512 byte ones ... */ |
883 | inode->i_blocks = (inode->i_size + 512 - 1) >> 9; | |
2bad8471 EVH |
884 | } |
885 | ||
886 | /** | |
887 | * v9fs_qid2ino - convert qid into inode number | |
888 | * @qid: qid to hash | |
889 | * | |
890 | * BUG: potential for inode number collisions? | |
891 | */ | |
892 | ||
bd238fb4 | 893 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
2bad8471 EVH |
894 | { |
895 | u64 path = qid->path + 2; | |
896 | ino_t i = 0; | |
897 | ||
898 | if (sizeof(ino_t) == sizeof(path)) | |
899 | memcpy(&i, &path, sizeof(ino_t)); | |
900 | else | |
901 | i = (ino_t) (path ^ (path >> 32)); | |
902 | ||
903 | return i; | |
904 | } | |
905 | ||
2bad8471 EVH |
906 | /** |
907 | * v9fs_readlink - read a symlink's location (internal version) | |
908 | * @dentry: dentry for symlink | |
73c592b9 | 909 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
910 | * @buflen: length of buffer |
911 | * | |
912 | */ | |
913 | ||
914 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
915 | { | |
bd238fb4 | 916 | int retval; |
2bad8471 | 917 | |
bd238fb4 LI |
918 | struct v9fs_session_info *v9ses; |
919 | struct p9_fid *fid; | |
51a87c55 | 920 | struct p9_wstat *st; |
2bad8471 | 921 | |
bd238fb4 LI |
922 | P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
923 | retval = -EPERM; | |
924 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
925 | fid = v9fs_fid_lookup(dentry); | |
ba17674f | 926 | if (IS_ERR(fid)) |
da977b2c | 927 | return PTR_ERR(fid); |
2bad8471 | 928 | |
2405669b | 929 | if (!v9fs_extended(v9ses)) |
bd238fb4 | 930 | return -EBADF; |
2bad8471 | 931 | |
bd238fb4 LI |
932 | st = p9_client_stat(fid); |
933 | if (IS_ERR(st)) | |
934 | return PTR_ERR(st); | |
2bad8471 | 935 | |
bd238fb4 | 936 | if (!(st->mode & P9_DMSYMLINK)) { |
2bad8471 | 937 | retval = -EINVAL; |
bd238fb4 | 938 | goto done; |
2bad8471 EVH |
939 | } |
940 | ||
941 | /* copy extension buffer into buffer */ | |
51a87c55 | 942 | strncpy(buffer, st->extension, buflen); |
2bad8471 | 943 | |
bd238fb4 | 944 | P9_DPRINTK(P9_DEBUG_VFS, |
51a87c55 | 945 | "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
2bad8471 | 946 | |
bd238fb4 | 947 | retval = buflen; |
da977b2c | 948 | |
bd238fb4 LI |
949 | done: |
950 | kfree(st); | |
2bad8471 EVH |
951 | return retval; |
952 | } | |
953 | ||
954 | /** | |
955 | * v9fs_vfs_readlink - read a symlink's location | |
956 | * @dentry: dentry for symlink | |
ee443996 | 957 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
958 | * @buflen: length of buffer |
959 | * | |
960 | */ | |
961 | ||
962 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
963 | int buflen) | |
964 | { | |
965 | int retval; | |
966 | int ret; | |
967 | char *link = __getname(); | |
968 | ||
0710d36a FM |
969 | if (unlikely(!link)) |
970 | return -ENOMEM; | |
971 | ||
a1f9d8d2 LI |
972 | if (buflen > PATH_MAX) |
973 | buflen = PATH_MAX; | |
2bad8471 | 974 | |
7dd0cdc5 WF |
975 | P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name, |
976 | dentry); | |
2bad8471 EVH |
977 | |
978 | retval = v9fs_readlink(dentry, link, buflen); | |
979 | ||
980 | if (retval > 0) { | |
981 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
bd238fb4 LI |
982 | P9_DPRINTK(P9_DEBUG_ERROR, |
983 | "problem copying to user: %d\n", ret); | |
2bad8471 EVH |
984 | retval = ret; |
985 | } | |
986 | } | |
987 | ||
ce44eeb6 | 988 | __putname(link); |
2bad8471 EVH |
989 | return retval; |
990 | } | |
991 | ||
992 | /** | |
993 | * v9fs_vfs_follow_link - follow a symlink path | |
994 | * @dentry: dentry for symlink | |
995 | * @nd: nameidata | |
996 | * | |
997 | */ | |
998 | ||
999 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1000 | { | |
1001 | int len = 0; | |
1002 | char *link = __getname(); | |
1003 | ||
bd238fb4 | 1004 | P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
2bad8471 EVH |
1005 | |
1006 | if (!link) | |
1007 | link = ERR_PTR(-ENOMEM); | |
1008 | else { | |
16cce6d2 | 1009 | len = v9fs_readlink(dentry, link, PATH_MAX); |
2bad8471 EVH |
1010 | |
1011 | if (len < 0) { | |
ce44eeb6 | 1012 | __putname(link); |
2bad8471 EVH |
1013 | link = ERR_PTR(len); |
1014 | } else | |
1015 | link[len] = 0; | |
1016 | } | |
1017 | nd_set_link(nd, link); | |
1018 | ||
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * v9fs_vfs_put_link - release a symlink path | |
1024 | * @dentry: dentry for symlink | |
1025 | * @nd: nameidata | |
ee443996 | 1026 | * @p: unused |
2bad8471 EVH |
1027 | * |
1028 | */ | |
1029 | ||
ee443996 EVH |
1030 | static void |
1031 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
2bad8471 EVH |
1032 | { |
1033 | char *s = nd_get_link(nd); | |
1034 | ||
6ff23207 DG |
1035 | P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
1036 | IS_ERR(s) ? "<error>" : s); | |
2bad8471 | 1037 | if (!IS_ERR(s)) |
ce44eeb6 | 1038 | __putname(s); |
2bad8471 EVH |
1039 | } |
1040 | ||
ee443996 EVH |
1041 | /** |
1042 | * v9fs_vfs_mkspecial - create a special file | |
1043 | * @dir: inode to create special file in | |
1044 | * @dentry: dentry to create | |
1045 | * @mode: mode to create special file | |
1046 | * @extension: 9p2000.u format extension string representing special file | |
1047 | * | |
1048 | */ | |
1049 | ||
531b1094 LI |
1050 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
1051 | int mode, const char *extension) | |
2bad8471 | 1052 | { |
bd238fb4 | 1053 | u32 perm; |
531b1094 | 1054 | struct v9fs_session_info *v9ses; |
bd238fb4 | 1055 | struct p9_fid *fid; |
2bad8471 | 1056 | |
6a3124a3 | 1057 | v9ses = v9fs_inode2v9ses(dir); |
2405669b | 1058 | if (!v9fs_extended(v9ses)) { |
bd238fb4 | 1059 | P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1060 | return -EPERM; |
2bad8471 EVH |
1061 | } |
1062 | ||
da977b2c | 1063 | perm = unixmode2p9mode(v9ses, mode); |
bd238fb4 LI |
1064 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1065 | P9_OREAD); | |
1066 | if (IS_ERR(fid)) | |
1067 | return PTR_ERR(fid); | |
da977b2c | 1068 | |
bd238fb4 | 1069 | p9_client_clunk(fid); |
6a3124a3 | 1070 | return 0; |
531b1094 LI |
1071 | } |
1072 | ||
1073 | /** | |
1074 | * v9fs_vfs_symlink - helper function to create symlinks | |
1075 | * @dir: directory inode containing symlink | |
1076 | * @dentry: dentry for symlink | |
1077 | * @symname: symlink data | |
1078 | * | |
ee443996 | 1079 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1080 | * |
1081 | */ | |
1082 | ||
1083 | static int | |
1084 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
1085 | { | |
bd238fb4 LI |
1086 | P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
1087 | dentry->d_name.name, symname); | |
531b1094 LI |
1088 | |
1089 | return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); | |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * v9fs_vfs_link - create a hardlink | |
1094 | * @old_dentry: dentry for file to link to | |
1095 | * @dir: inode destination for new link | |
1096 | * @dentry: dentry for link | |
1097 | * | |
1098 | */ | |
1099 | ||
531b1094 LI |
1100 | static int |
1101 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1102 | struct dentry *dentry) | |
1103 | { | |
1104 | int retval; | |
bd238fb4 | 1105 | struct p9_fid *oldfid; |
531b1094 LI |
1106 | char *name; |
1107 | ||
bd238fb4 LI |
1108 | P9_DPRINTK(P9_DEBUG_VFS, |
1109 | " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
531b1094 LI |
1110 | old_dentry->d_name.name); |
1111 | ||
da977b2c | 1112 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1113 | if (IS_ERR(oldfid)) |
da977b2c | 1114 | return PTR_ERR(oldfid); |
531b1094 LI |
1115 | |
1116 | name = __getname(); | |
da977b2c EVH |
1117 | if (unlikely(!name)) { |
1118 | retval = -ENOMEM; | |
1119 | goto clunk_fid; | |
1120 | } | |
0710d36a | 1121 | |
16cce6d2 | 1122 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1123 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
531b1094 | 1124 | __putname(name); |
2bad8471 | 1125 | |
da977b2c | 1126 | clunk_fid: |
bd238fb4 | 1127 | p9_client_clunk(oldfid); |
2bad8471 EVH |
1128 | return retval; |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * v9fs_vfs_mknod - create a special file | |
1133 | * @dir: inode destination for new link | |
1134 | * @dentry: dentry for file | |
1135 | * @mode: mode for creation | |
ee443996 | 1136 | * @rdev: device associated with special file |
2bad8471 EVH |
1137 | * |
1138 | */ | |
1139 | ||
1140 | static int | |
1141 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1142 | { | |
531b1094 LI |
1143 | int retval; |
1144 | char *name; | |
2bad8471 | 1145 | |
bd238fb4 LI |
1146 | P9_DPRINTK(P9_DEBUG_VFS, |
1147 | " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
2bad8471 EVH |
1148 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
1149 | ||
531b1094 LI |
1150 | if (!new_valid_dev(rdev)) |
1151 | return -EINVAL; | |
2bad8471 | 1152 | |
531b1094 | 1153 | name = __getname(); |
c0291a05 ET |
1154 | if (!name) |
1155 | return -ENOMEM; | |
2bad8471 EVH |
1156 | /* build extension */ |
1157 | if (S_ISBLK(mode)) | |
531b1094 | 1158 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1159 | else if (S_ISCHR(mode)) |
531b1094 | 1160 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
73c592b9 | 1161 | else if (S_ISFIFO(mode)) |
531b1094 | 1162 | *name = 0; |
2bad8471 | 1163 | else { |
531b1094 LI |
1164 | __putname(name); |
1165 | return -EINVAL; | |
2bad8471 EVH |
1166 | } |
1167 | ||
531b1094 LI |
1168 | retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
1169 | __putname(name); | |
2bad8471 EVH |
1170 | |
1171 | return retval; | |
1172 | } | |
1173 | ||
754661f1 | 1174 | static const struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1175 | .create = v9fs_vfs_create, |
1176 | .lookup = v9fs_vfs_lookup, | |
1177 | .symlink = v9fs_vfs_symlink, | |
1178 | .link = v9fs_vfs_link, | |
1179 | .unlink = v9fs_vfs_unlink, | |
1180 | .mkdir = v9fs_vfs_mkdir, | |
1181 | .rmdir = v9fs_vfs_rmdir, | |
1182 | .mknod = v9fs_vfs_mknod, | |
1183 | .rename = v9fs_vfs_rename, | |
1184 | .readlink = v9fs_vfs_readlink, | |
1185 | .getattr = v9fs_vfs_getattr, | |
1186 | .setattr = v9fs_vfs_setattr, | |
1187 | }; | |
1188 | ||
754661f1 | 1189 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1190 | .create = v9fs_vfs_create, |
1191 | .lookup = v9fs_vfs_lookup, | |
1192 | .unlink = v9fs_vfs_unlink, | |
1193 | .mkdir = v9fs_vfs_mkdir, | |
1194 | .rmdir = v9fs_vfs_rmdir, | |
1195 | .mknod = v9fs_vfs_mknod, | |
1196 | .rename = v9fs_vfs_rename, | |
1197 | .getattr = v9fs_vfs_getattr, | |
1198 | .setattr = v9fs_vfs_setattr, | |
1199 | }; | |
1200 | ||
754661f1 | 1201 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1202 | .getattr = v9fs_vfs_getattr, |
1203 | .setattr = v9fs_vfs_setattr, | |
1204 | }; | |
1205 | ||
754661f1 | 1206 | static const struct inode_operations v9fs_symlink_inode_operations = { |
2bad8471 EVH |
1207 | .readlink = v9fs_vfs_readlink, |
1208 | .follow_link = v9fs_vfs_follow_link, | |
1209 | .put_link = v9fs_vfs_put_link, | |
1210 | .getattr = v9fs_vfs_getattr, | |
1211 | .setattr = v9fs_vfs_setattr, | |
1212 | }; |