Commit | Line | Data |
---|---|---|
2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
73c592b9 | 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
5 | * |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to: | |
21 | * Free Software Foundation | |
22 | * 51 Franklin Street, Fifth Floor | |
23 | * Boston, MA 02111-1301 USA | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/stat.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/smp_lock.h> | |
35 | #include <linux/inet.h> | |
36 | #include <linux/namei.h> | |
37 | #include <linux/idr.h> | |
38 | ||
39 | #include "debug.h" | |
40 | #include "v9fs.h" | |
41 | #include "9p.h" | |
42 | #include "v9fs_vfs.h" | |
43 | #include "conv.h" | |
44 | #include "fid.h" | |
45 | ||
46 | static struct inode_operations v9fs_dir_inode_operations; | |
b501611a | 47 | static struct inode_operations v9fs_dir_inode_operations_ext; |
2bad8471 EVH |
48 | static struct inode_operations v9fs_file_inode_operations; |
49 | static struct inode_operations v9fs_symlink_inode_operations; | |
50 | ||
51 | /** | |
52 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
53 | * @v9ses: v9fs session information | |
54 | * @mode: mode to convert | |
55 | * | |
56 | */ | |
57 | ||
73c592b9 | 58 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
59 | { |
60 | int res; | |
61 | res = mode & 0777; | |
62 | if (S_ISDIR(mode)) | |
63 | res |= V9FS_DMDIR; | |
64 | if (v9ses->extended) { | |
65 | if (S_ISLNK(mode)) | |
66 | res |= V9FS_DMSYMLINK; | |
67 | if (v9ses->nodev == 0) { | |
68 | if (S_ISSOCK(mode)) | |
69 | res |= V9FS_DMSOCKET; | |
70 | if (S_ISFIFO(mode)) | |
71 | res |= V9FS_DMNAMEDPIPE; | |
72 | if (S_ISBLK(mode)) | |
73 | res |= V9FS_DMDEVICE; | |
74 | if (S_ISCHR(mode)) | |
75 | res |= V9FS_DMDEVICE; | |
76 | } | |
77 | ||
78 | if ((mode & S_ISUID) == S_ISUID) | |
79 | res |= V9FS_DMSETUID; | |
80 | if ((mode & S_ISGID) == S_ISGID) | |
81 | res |= V9FS_DMSETGID; | |
82 | if ((mode & V9FS_DMLINK)) | |
83 | res |= V9FS_DMLINK; | |
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 | ||
102 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) | |
103 | res |= S_IFDIR; | |
104 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) | |
105 | res |= S_IFLNK; | |
106 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) | |
107 | && (v9ses->nodev == 0)) | |
108 | res |= S_IFSOCK; | |
109 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) | |
110 | && (v9ses->nodev == 0)) | |
111 | res |= S_IFIFO; | |
112 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) | |
113 | && (v9ses->nodev == 0)) | |
114 | res |= S_IFBLK; | |
115 | else | |
116 | res |= S_IFREG; | |
117 | ||
118 | if (v9ses->extended) { | |
119 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) | |
120 | res |= S_ISUID; | |
121 | ||
122 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) | |
123 | res |= S_ISGID; | |
124 | } | |
125 | ||
126 | return res; | |
127 | } | |
128 | ||
129 | /** | |
130 | * v9fs_blank_mistat - helper function to setup a 9P stat structure | |
131 | * @v9ses: 9P session info (for determining extended mode) | |
132 | * @mistat: structure to initialize | |
133 | * | |
134 | */ | |
135 | ||
73c592b9 | 136 | static void |
2bad8471 EVH |
137 | v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat) |
138 | { | |
139 | mistat->type = ~0; | |
140 | mistat->dev = ~0; | |
141 | mistat->qid.type = ~0; | |
142 | mistat->qid.version = ~0; | |
143 | *((long long *)&mistat->qid.path) = ~0; | |
144 | mistat->mode = ~0; | |
145 | mistat->atime = ~0; | |
146 | mistat->mtime = ~0; | |
147 | mistat->length = ~0; | |
148 | mistat->name = mistat->data; | |
149 | mistat->uid = mistat->data; | |
150 | mistat->gid = mistat->data; | |
151 | mistat->muid = mistat->data; | |
152 | if (v9ses->extended) { | |
153 | mistat->n_uid = ~0; | |
154 | mistat->n_gid = ~0; | |
155 | mistat->n_muid = ~0; | |
156 | mistat->extension = mistat->data; | |
157 | } | |
158 | *mistat->data = 0; | |
159 | } | |
160 | ||
161 | /** | |
162 | * v9fs_mistat2unix - convert mistat to unix stat | |
163 | * @mistat: Plan 9 metadata (mistat) structure | |
73c592b9 | 164 | * @buf: unix metadata (stat) structure to populate |
2bad8471 EVH |
165 | * @sb: superblock |
166 | * | |
167 | */ | |
168 | ||
169 | static void | |
170 | v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf, | |
171 | struct super_block *sb) | |
172 | { | |
173 | struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL; | |
174 | ||
175 | buf->st_nlink = 1; | |
176 | ||
177 | buf->st_atime = mistat->atime; | |
178 | buf->st_mtime = mistat->mtime; | |
179 | buf->st_ctime = mistat->mtime; | |
180 | ||
2bad8471 EVH |
181 | buf->st_uid = (unsigned short)-1; |
182 | buf->st_gid = (unsigned short)-1; | |
183 | ||
184 | if (v9ses && v9ses->extended) { | |
73c592b9 | 185 | /* TODO: string to uid mapping via user-space daemon */ |
2bad8471 EVH |
186 | if (mistat->n_uid != -1) |
187 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); | |
188 | ||
189 | if (mistat->n_gid != -1) | |
190 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); | |
191 | } | |
192 | ||
193 | if (buf->st_uid == (unsigned short)-1) | |
194 | buf->st_uid = v9ses->uid; | |
195 | if (buf->st_gid == (unsigned short)-1) | |
196 | buf->st_gid = v9ses->gid; | |
197 | ||
198 | buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); | |
199 | if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { | |
200 | char type = 0; | |
201 | int major = -1; | |
202 | int minor = -1; | |
203 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
204 | switch (type) { | |
205 | case 'c': | |
206 | buf->st_mode &= ~S_IFBLK; | |
207 | buf->st_mode |= S_IFCHR; | |
208 | break; | |
209 | case 'b': | |
210 | break; | |
211 | default: | |
212 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
213 | type, mistat->extension); | |
214 | }; | |
215 | buf->st_rdev = MKDEV(major, minor); | |
216 | } else | |
217 | buf->st_rdev = 0; | |
218 | ||
219 | buf->st_size = mistat->length; | |
220 | ||
221 | buf->st_blksize = sb->s_blocksize; | |
222 | buf->st_blocks = | |
223 | (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; | |
224 | } | |
225 | ||
226 | /** | |
227 | * v9fs_get_inode - helper function to setup an inode | |
228 | * @sb: superblock | |
229 | * @mode: mode to setup inode with | |
230 | * | |
231 | */ | |
232 | ||
233 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
234 | { | |
235 | struct inode *inode = NULL; | |
b501611a | 236 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
2bad8471 EVH |
237 | |
238 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
239 | ||
240 | inode = new_inode(sb); | |
241 | if (inode) { | |
242 | inode->i_mode = mode; | |
243 | inode->i_uid = current->fsuid; | |
244 | inode->i_gid = current->fsgid; | |
245 | inode->i_blksize = sb->s_blocksize; | |
246 | inode->i_blocks = 0; | |
247 | inode->i_rdev = 0; | |
248 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
249 | ||
250 | switch (mode & S_IFMT) { | |
251 | case S_IFIFO: | |
252 | case S_IFBLK: | |
253 | case S_IFCHR: | |
254 | case S_IFSOCK: | |
b501611a EVH |
255 | if(!v9ses->extended) { |
256 | dprintk(DEBUG_ERROR, "special files without extended mode\n"); | |
257 | return ERR_PTR(-EINVAL); | |
258 | } | |
5d58bec5 EVH |
259 | init_special_inode(inode, inode->i_mode, |
260 | inode->i_rdev); | |
261 | break; | |
2bad8471 EVH |
262 | case S_IFREG: |
263 | inode->i_op = &v9fs_file_inode_operations; | |
264 | inode->i_fop = &v9fs_file_operations; | |
265 | break; | |
b501611a EVH |
266 | case S_IFLNK: |
267 | if(!v9ses->extended) { | |
268 | dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); | |
269 | return ERR_PTR(-EINVAL); | |
270 | } | |
271 | inode->i_op = &v9fs_symlink_inode_operations; | |
272 | break; | |
2bad8471 EVH |
273 | case S_IFDIR: |
274 | inode->i_nlink++; | |
b501611a EVH |
275 | if(v9ses->extended) |
276 | inode->i_op = &v9fs_dir_inode_operations_ext; | |
277 | else | |
278 | inode->i_op = &v9fs_dir_inode_operations; | |
2bad8471 EVH |
279 | inode->i_fop = &v9fs_dir_operations; |
280 | break; | |
2bad8471 EVH |
281 | default: |
282 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
283 | mode, mode & S_IFMT); | |
284 | return ERR_PTR(-EINVAL); | |
285 | } | |
286 | } else { | |
287 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
288 | return ERR_PTR(-ENOMEM); | |
289 | } | |
290 | return inode; | |
291 | } | |
292 | ||
293 | /** | |
294 | * v9fs_create - helper function to create files and directories | |
295 | * @dir: directory inode file is being created in | |
296 | * @file_dentry: dentry file is being created in | |
297 | * @perm: permissions file is being created with | |
73c592b9 | 298 | * @open_mode: resulting open mode for file |
2bad8471 EVH |
299 | * |
300 | */ | |
301 | ||
302 | static int | |
303 | v9fs_create(struct inode *dir, | |
304 | struct dentry *file_dentry, | |
305 | unsigned int perm, unsigned int open_mode) | |
306 | { | |
307 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
308 | struct super_block *sb = dir->i_sb; | |
309 | struct v9fs_fid *dirfid = | |
0b8dd177 | 310 | v9fs_fid_lookup(file_dentry->d_parent); |
2bad8471 EVH |
311 | struct v9fs_fid *fid = NULL; |
312 | struct inode *file_inode = NULL; | |
313 | struct v9fs_fcall *fcall = NULL; | |
314 | struct v9fs_qid qid; | |
315 | struct stat newstat; | |
316 | int dirfidnum = -1; | |
317 | long newfid = -1; | |
318 | int result = 0; | |
319 | unsigned int iounit = 0; | |
0b8dd177 | 320 | int wfidno = -1; |
3cf6429a | 321 | int err; |
2bad8471 EVH |
322 | |
323 | perm = unixmode2p9mode(v9ses, perm); | |
324 | ||
325 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, | |
326 | file_dentry, perm, open_mode); | |
327 | ||
328 | if (!dirfid) | |
329 | return -EBADF; | |
330 | ||
331 | dirfidnum = dirfid->fid; | |
332 | if (dirfidnum < 0) { | |
333 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", | |
334 | dir->i_ino); | |
335 | return -EBADF; | |
336 | } | |
337 | ||
338 | if (file_dentry->d_inode) { | |
339 | dprintk(DEBUG_ERROR, | |
340 | "Odd. There is an inode for dir %lu, name :%s:\n", | |
341 | dir->i_ino, file_dentry->d_name.name); | |
342 | return -EEXIST; | |
343 | } | |
344 | ||
345 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
346 | if (newfid < 0) { | |
347 | eprintk(KERN_WARNING, "no free fids available\n"); | |
348 | return -ENOSPC; | |
349 | } | |
350 | ||
351 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); | |
352 | if (result < 0) { | |
353 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
354 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
0b8dd177 | 355 | newfid = -1; |
2bad8471 EVH |
356 | goto CleanUpFid; |
357 | } | |
358 | ||
359 | kfree(fcall); | |
3cf6429a | 360 | fcall = NULL; |
2bad8471 EVH |
361 | |
362 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, | |
363 | perm, open_mode, &fcall); | |
364 | if (result < 0) { | |
365 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", | |
366 | FCALL_ERROR(fcall), result); | |
367 | ||
368 | goto CleanUpFid; | |
369 | } | |
370 | ||
371 | iounit = fcall->params.rcreate.iounit; | |
372 | qid = fcall->params.rcreate.qid; | |
373 | kfree(fcall); | |
3cf6429a | 374 | fcall = NULL; |
2bad8471 | 375 | |
3cf6429a LI |
376 | if (!(perm&V9FS_DMDIR)) { |
377 | fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1); | |
378 | dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate); | |
379 | if (!fid) { | |
380 | result = -ENOMEM; | |
381 | goto CleanUpFid; | |
382 | } | |
2bad8471 | 383 | |
3cf6429a LI |
384 | fid->qid = qid; |
385 | fid->iounit = iounit; | |
386 | } else { | |
387 | err = v9fs_t_clunk(v9ses, newfid); | |
d8da097a | 388 | newfid = -1; |
3cf6429a LI |
389 | if (err < 0) |
390 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err); | |
391 | } | |
0b8dd177 LI |
392 | |
393 | /* walk to the newly created file and put the fid in the dentry */ | |
394 | wfidno = v9fs_get_idpool(&v9ses->fidpool); | |
d8da097a | 395 | if (wfidno < 0) { |
0b8dd177 LI |
396 | eprintk(KERN_WARNING, "no free fids available\n"); |
397 | return -ENOSPC; | |
398 | } | |
399 | ||
400 | result = v9fs_t_walk(v9ses, dirfidnum, wfidno, | |
3cf6429a | 401 | (char *) file_dentry->d_name.name, &fcall); |
0b8dd177 LI |
402 | if (result < 0) { |
403 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
404 | v9fs_put_idpool(wfidno, &v9ses->fidpool); | |
405 | wfidno = -1; | |
406 | goto CleanUpFid; | |
407 | } | |
3cf6429a LI |
408 | kfree(fcall); |
409 | fcall = NULL; | |
0b8dd177 LI |
410 | |
411 | if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) { | |
3cf6429a | 412 | v9fs_put_idpool(wfidno, &v9ses->fidpool); |
0b8dd177 LI |
413 | |
414 | goto CleanUpFid; | |
415 | } | |
2bad8471 EVH |
416 | |
417 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || | |
418 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || | |
419 | (perm & V9FS_DMDEVICE)) | |
420 | return 0; | |
421 | ||
d8da097a | 422 | result = v9fs_t_stat(v9ses, wfidno, &fcall); |
2bad8471 EVH |
423 | if (result < 0) { |
424 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), | |
425 | result); | |
426 | goto CleanUpFid; | |
427 | } | |
428 | ||
429 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
430 | ||
431 | file_inode = v9fs_get_inode(sb, newstat.st_mode); | |
432 | if ((!file_inode) || IS_ERR(file_inode)) { | |
433 | dprintk(DEBUG_ERROR, "create inode failed\n"); | |
434 | result = -EBADF; | |
435 | goto CleanUpFid; | |
436 | } | |
437 | ||
438 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); | |
439 | kfree(fcall); | |
a93a117e LI |
440 | fcall = NULL; |
441 | file_dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
442 | d_instantiate(file_dentry, file_inode); |
443 | ||
2bad8471 EVH |
444 | return 0; |
445 | ||
446 | CleanUpFid: | |
447 | kfree(fcall); | |
3cf6429a | 448 | fcall = NULL; |
2bad8471 | 449 | |
0b8dd177 | 450 | if (newfid >= 0) { |
3cf6429a LI |
451 | err = v9fs_t_clunk(v9ses, newfid); |
452 | if (err < 0) | |
453 | dprintk(DEBUG_ERROR, "clunk failed: %d\n", err); | |
0b8dd177 LI |
454 | } |
455 | if (wfidno >= 0) { | |
3cf6429a LI |
456 | err = v9fs_t_clunk(v9ses, wfidno); |
457 | if (err < 0) | |
458 | dprintk(DEBUG_ERROR, "clunk failed: %d\n", err); | |
2bad8471 EVH |
459 | } |
460 | return result; | |
461 | } | |
462 | ||
463 | /** | |
464 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
465 | * @dir: directory inode that is being deleted |
466 | * @file: dentry that is being deleted | |
467 | * @rmdir: removing a directory | |
2bad8471 EVH |
468 | * |
469 | */ | |
470 | ||
471 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
472 | { | |
473 | struct v9fs_fcall *fcall = NULL; | |
474 | struct super_block *sb = NULL; | |
475 | struct v9fs_session_info *v9ses = NULL; | |
476 | struct v9fs_fid *v9fid = NULL; | |
477 | struct inode *file_inode = NULL; | |
478 | int fid = -1; | |
479 | int result = 0; | |
480 | ||
481 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
482 | rmdir); | |
483 | ||
484 | file_inode = file->d_inode; | |
485 | sb = file_inode->i_sb; | |
486 | v9ses = v9fs_inode2v9ses(file_inode); | |
0b8dd177 | 487 | v9fid = v9fs_fid_lookup(file); |
2bad8471 EVH |
488 | |
489 | if (!v9fid) { | |
490 | dprintk(DEBUG_ERROR, | |
491 | "no v9fs_fid\n"); | |
492 | return -EBADF; | |
493 | } | |
494 | ||
495 | fid = v9fid->fid; | |
496 | if (fid < 0) { | |
497 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
498 | file_inode->i_ino); | |
499 | return -EBADF; | |
500 | } | |
501 | ||
502 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
503 | if (result < 0) | |
504 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", | |
505 | FCALL_ERROR(fcall), result); | |
506 | else { | |
507 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
508 | v9fs_fid_destroy(v9fid); | |
509 | } | |
510 | ||
511 | kfree(fcall); | |
512 | return result; | |
513 | } | |
514 | ||
515 | /** | |
516 | * v9fs_vfs_create - VFS hook to create files | |
517 | * @inode: directory inode that is being deleted | |
518 | * @dentry: dentry that is being deleted | |
519 | * @perm: create permissions | |
520 | * @nd: path information | |
521 | * | |
522 | */ | |
523 | ||
524 | static int | |
525 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, | |
526 | struct nameidata *nd) | |
527 | { | |
528 | return v9fs_create(inode, dentry, perm, O_RDWR); | |
529 | } | |
530 | ||
531 | /** | |
532 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 533 | * @inode: inode that is being unlinked |
2bad8471 EVH |
534 | * @dentry: dentry that is being unlinked |
535 | * @mode: mode for new directory | |
536 | * | |
537 | */ | |
538 | ||
539 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) | |
540 | { | |
541 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); | |
542 | } | |
543 | ||
544 | /** | |
545 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
546 | * @dir: inode that is being walked from | |
547 | * @dentry: dentry that is being walked to? | |
548 | * @nameidata: path data | |
549 | * | |
550 | */ | |
551 | ||
552 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
553 | struct nameidata *nameidata) | |
554 | { | |
555 | struct super_block *sb; | |
556 | struct v9fs_session_info *v9ses; | |
557 | struct v9fs_fid *dirfid; | |
558 | struct v9fs_fid *fid; | |
559 | struct inode *inode; | |
560 | struct v9fs_fcall *fcall = NULL; | |
561 | struct stat newstat; | |
562 | int dirfidnum = -1; | |
563 | int newfid = -1; | |
564 | int result = 0; | |
565 | ||
566 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
567 | dir, dentry->d_iname, dentry, nameidata); | |
568 | ||
569 | sb = dir->i_sb; | |
570 | v9ses = v9fs_inode2v9ses(dir); | |
0b8dd177 | 571 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 EVH |
572 | |
573 | if (!dirfid) { | |
574 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
575 | return ERR_PTR(-EINVAL); | |
576 | } | |
577 | ||
578 | dirfidnum = dirfid->fid; | |
579 | ||
580 | if (dirfidnum < 0) { | |
581 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
582 | dir, dir->i_ino); | |
583 | return ERR_PTR(-EBADF); | |
584 | } | |
585 | ||
586 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
587 | if (newfid < 0) { | |
588 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
589 | return ERR_PTR(-ENOSPC); | |
590 | } | |
591 | ||
592 | result = | |
593 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, | |
594 | NULL); | |
595 | if (result < 0) { | |
596 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
597 | if (result == -ENOENT) { | |
598 | d_add(dentry, NULL); | |
0b8dd177 | 599 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
600 | "Return negative dentry %p count %d\n", |
601 | dentry, atomic_read(&dentry->d_count)); | |
602 | return NULL; | |
603 | } | |
604 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
605 | goto FreeFcall; | |
606 | } | |
607 | ||
608 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
609 | if (result < 0) { | |
610 | dprintk(DEBUG_ERROR, "stat error\n"); | |
611 | goto FreeFcall; | |
612 | } | |
613 | ||
614 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
615 | inode = v9fs_get_inode(sb, newstat.st_mode); | |
616 | ||
617 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
618 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
619 | PTR_ERR(inode)); | |
620 | ||
621 | result = -ENOSPC; | |
622 | goto FreeFcall; | |
623 | } | |
624 | ||
625 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
626 | ||
0b8dd177 | 627 | fid = v9fs_fid_create(dentry, v9ses, newfid, 0); |
2bad8471 EVH |
628 | if (fid == NULL) { |
629 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
630 | result = -ENOMEM; | |
631 | goto FreeFcall; | |
632 | } | |
633 | ||
2bad8471 EVH |
634 | fid->qid = fcall->params.rstat.stat->qid; |
635 | ||
636 | dentry->d_op = &v9fs_dentry_operations; | |
637 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); | |
638 | ||
639 | d_add(dentry, inode); | |
640 | kfree(fcall); | |
641 | ||
642 | return NULL; | |
643 | ||
644 | FreeFcall: | |
645 | kfree(fcall); | |
646 | return ERR_PTR(result); | |
647 | } | |
648 | ||
649 | /** | |
650 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
651 | * @i: inode that is being unlinked | |
73c592b9 | 652 | * @d: dentry that is being unlinked |
2bad8471 EVH |
653 | * |
654 | */ | |
655 | ||
656 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
657 | { | |
658 | return v9fs_remove(i, d, 0); | |
659 | } | |
660 | ||
661 | /** | |
662 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
663 | * @i: inode that is being unlinked | |
73c592b9 | 664 | * @d: dentry that is being unlinked |
2bad8471 EVH |
665 | * |
666 | */ | |
667 | ||
668 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
669 | { | |
670 | return v9fs_remove(i, d, 1); | |
671 | } | |
672 | ||
673 | /** | |
674 | * v9fs_vfs_rename - VFS hook to rename an inode | |
675 | * @old_dir: old dir inode | |
676 | * @old_dentry: old dentry | |
677 | * @new_dir: new dir inode | |
678 | * @new_dentry: new dentry | |
679 | * | |
680 | */ | |
681 | ||
682 | static int | |
683 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
684 | struct inode *new_dir, struct dentry *new_dentry) | |
685 | { | |
686 | struct inode *old_inode = old_dentry->d_inode; | |
687 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 688 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 | 689 | struct v9fs_fid *olddirfid = |
0b8dd177 | 690 | v9fs_fid_lookup(old_dentry->d_parent); |
2bad8471 | 691 | struct v9fs_fid *newdirfid = |
0b8dd177 | 692 | v9fs_fid_lookup(new_dentry->d_parent); |
2bad8471 EVH |
693 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
694 | struct v9fs_fcall *fcall = NULL; | |
695 | int fid = -1; | |
696 | int olddirfidnum = -1; | |
697 | int newdirfidnum = -1; | |
698 | int retval = 0; | |
699 | ||
700 | dprintk(DEBUG_VFS, "\n"); | |
701 | ||
73c592b9 EVH |
702 | if (!mistat) |
703 | return -ENOMEM; | |
704 | ||
2bad8471 EVH |
705 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { |
706 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
707 | return -EBADF; | |
708 | } | |
709 | ||
710 | /* 9P can only handle file rename in the same directory */ | |
711 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
712 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
713 | retval = -EPERM; | |
714 | goto FreeFcallnBail; | |
715 | } | |
716 | ||
717 | fid = oldfid->fid; | |
718 | olddirfidnum = olddirfid->fid; | |
719 | newdirfidnum = newdirfid->fid; | |
720 | ||
721 | if (fid < 0) { | |
722 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
723 | old_inode->i_ino); | |
724 | retval = -EBADF; | |
725 | goto FreeFcallnBail; | |
726 | } | |
727 | ||
728 | v9fs_blank_mistat(v9ses, mistat); | |
729 | ||
730 | strcpy(mistat->data + 1, v9ses->name); | |
731 | mistat->name = mistat->data + 1 + strlen(v9ses->name); | |
732 | ||
733 | if (new_dentry->d_name.len > | |
734 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { | |
735 | dprintk(DEBUG_ERROR, "new name too long\n"); | |
736 | goto FreeFcallnBail; | |
737 | } | |
738 | ||
739 | strcpy(mistat->name, new_dentry->d_name.name); | |
740 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); | |
741 | ||
742 | FreeFcallnBail: | |
743 | kfree(mistat); | |
744 | ||
745 | if (retval < 0) | |
746 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
747 | FCALL_ERROR(fcall)); | |
748 | ||
749 | kfree(fcall); | |
750 | return retval; | |
751 | } | |
752 | ||
753 | /** | |
754 | * v9fs_vfs_getattr - retreive file metadata | |
755 | * @mnt - mount information | |
756 | * @dentry - file to get attributes on | |
757 | * @stat - metadata structure to populate | |
758 | * | |
759 | */ | |
760 | ||
761 | static int | |
762 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
763 | struct kstat *stat) | |
764 | { | |
765 | struct v9fs_fcall *fcall = NULL; | |
766 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 767 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
768 | int err = -EPERM; |
769 | ||
770 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
771 | if (!fid) { | |
772 | dprintk(DEBUG_ERROR, | |
773 | "couldn't find fid associated with dentry\n"); | |
774 | return -EBADF; | |
775 | } | |
776 | ||
777 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
778 | ||
779 | if (err < 0) | |
780 | dprintk(DEBUG_ERROR, "stat error\n"); | |
781 | else { | |
782 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, | |
783 | dentry->d_inode->i_sb); | |
784 | generic_fillattr(dentry->d_inode, stat); | |
785 | } | |
786 | ||
787 | kfree(fcall); | |
788 | return err; | |
789 | } | |
790 | ||
791 | /** | |
792 | * v9fs_vfs_setattr - set file metadata | |
793 | * @dentry: file whose metadata to set | |
794 | * @iattr: metadata assignment structure | |
795 | * | |
796 | */ | |
797 | ||
798 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
799 | { | |
800 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 801 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 | 802 | struct v9fs_fcall *fcall = NULL; |
73c592b9 | 803 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
2bad8471 EVH |
804 | int res = -EPERM; |
805 | ||
806 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 EVH |
807 | |
808 | if (!mistat) | |
809 | return -ENOMEM; | |
810 | ||
2bad8471 EVH |
811 | if (!fid) { |
812 | dprintk(DEBUG_ERROR, | |
813 | "Couldn't find fid associated with dentry\n"); | |
814 | return -EBADF; | |
815 | } | |
816 | ||
2bad8471 EVH |
817 | v9fs_blank_mistat(v9ses, mistat); |
818 | if (iattr->ia_valid & ATTR_MODE) | |
819 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); | |
820 | ||
821 | if (iattr->ia_valid & ATTR_MTIME) | |
822 | mistat->mtime = iattr->ia_mtime.tv_sec; | |
823 | ||
824 | if (iattr->ia_valid & ATTR_ATIME) | |
825 | mistat->atime = iattr->ia_atime.tv_sec; | |
826 | ||
827 | if (iattr->ia_valid & ATTR_SIZE) | |
828 | mistat->length = iattr->ia_size; | |
829 | ||
830 | if (v9ses->extended) { | |
73c592b9 | 831 | char *ptr = mistat->data+1; |
2bad8471 EVH |
832 | |
833 | if (iattr->ia_valid & ATTR_UID) { | |
73c592b9 EVH |
834 | mistat->uid = ptr; |
835 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); | |
2bad8471 EVH |
836 | mistat->n_uid = iattr->ia_uid; |
837 | } | |
838 | ||
839 | if (iattr->ia_valid & ATTR_GID) { | |
73c592b9 EVH |
840 | mistat->gid = ptr; |
841 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); | |
2bad8471 EVH |
842 | mistat->n_gid = iattr->ia_gid; |
843 | } | |
2bad8471 EVH |
844 | } |
845 | ||
846 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); | |
847 | ||
848 | if (res < 0) | |
849 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); | |
850 | ||
851 | kfree(mistat); | |
852 | kfree(fcall); | |
853 | ||
854 | if (res >= 0) | |
855 | res = inode_setattr(dentry->d_inode, iattr); | |
856 | ||
857 | return res; | |
858 | } | |
859 | ||
860 | /** | |
861 | * v9fs_mistat2inode - populate an inode structure with mistat info | |
862 | * @mistat: Plan 9 metadata (mistat) structure | |
863 | * @inode: inode to populate | |
864 | * @sb: superblock of filesystem | |
865 | * | |
866 | */ | |
867 | ||
868 | void | |
869 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, | |
870 | struct super_block *sb) | |
871 | { | |
872 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
873 | ||
874 | inode->i_nlink = 1; | |
875 | ||
876 | inode->i_atime.tv_sec = mistat->atime; | |
877 | inode->i_mtime.tv_sec = mistat->mtime; | |
878 | inode->i_ctime.tv_sec = mistat->mtime; | |
879 | ||
880 | inode->i_uid = -1; | |
881 | inode->i_gid = -1; | |
882 | ||
883 | if (v9ses->extended) { | |
884 | /* TODO: string to uid mapping via user-space daemon */ | |
885 | inode->i_uid = mistat->n_uid; | |
886 | inode->i_gid = mistat->n_gid; | |
887 | ||
888 | if (mistat->n_uid == -1) | |
889 | sscanf(mistat->uid, "%x", &inode->i_uid); | |
890 | ||
891 | if (mistat->n_gid == -1) | |
892 | sscanf(mistat->gid, "%x", &inode->i_gid); | |
893 | } | |
894 | ||
895 | if (inode->i_uid == -1) | |
896 | inode->i_uid = v9ses->uid; | |
897 | if (inode->i_gid == -1) | |
898 | inode->i_gid = v9ses->gid; | |
899 | ||
900 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); | |
901 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { | |
902 | char type = 0; | |
903 | int major = -1; | |
904 | int minor = -1; | |
905 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
906 | switch (type) { | |
907 | case 'c': | |
908 | inode->i_mode &= ~S_IFBLK; | |
909 | inode->i_mode |= S_IFCHR; | |
910 | break; | |
911 | case 'b': | |
912 | break; | |
913 | default: | |
914 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
915 | type, mistat->extension); | |
916 | }; | |
917 | inode->i_rdev = MKDEV(major, minor); | |
918 | } else | |
919 | inode->i_rdev = 0; | |
920 | ||
921 | inode->i_size = mistat->length; | |
922 | ||
923 | inode->i_blksize = sb->s_blocksize; | |
924 | inode->i_blocks = | |
925 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
926 | } | |
927 | ||
928 | /** | |
929 | * v9fs_qid2ino - convert qid into inode number | |
930 | * @qid: qid to hash | |
931 | * | |
932 | * BUG: potential for inode number collisions? | |
933 | */ | |
934 | ||
935 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
936 | { | |
937 | u64 path = qid->path + 2; | |
938 | ino_t i = 0; | |
939 | ||
940 | if (sizeof(ino_t) == sizeof(path)) | |
941 | memcpy(&i, &path, sizeof(ino_t)); | |
942 | else | |
943 | i = (ino_t) (path ^ (path >> 32)); | |
944 | ||
945 | return i; | |
946 | } | |
947 | ||
948 | /** | |
949 | * v9fs_vfs_symlink - helper function to create symlinks | |
950 | * @dir: directory inode containing symlink | |
951 | * @dentry: dentry for symlink | |
952 | * @symname: symlink data | |
953 | * | |
954 | * See 9P2000.u RFC for more information | |
955 | * | |
956 | */ | |
957 | ||
958 | static int | |
959 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
960 | { | |
961 | int retval = -EPERM; | |
962 | struct v9fs_fid *newfid; | |
963 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
2bad8471 EVH |
964 | struct v9fs_fcall *fcall = NULL; |
965 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
3cf6429a | 966 | int err; |
2bad8471 EVH |
967 | |
968 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
969 | symname); | |
970 | ||
73c592b9 EVH |
971 | if (!mistat) |
972 | return -ENOMEM; | |
2bad8471 EVH |
973 | |
974 | if (!v9ses->extended) { | |
975 | dprintk(DEBUG_ERROR, "not extended\n"); | |
976 | goto FreeFcall; | |
977 | } | |
978 | ||
979 | /* issue a create */ | |
980 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); | |
981 | if (retval != 0) | |
982 | goto FreeFcall; | |
983 | ||
0b8dd177 | 984 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
985 | |
986 | /* issue a twstat */ | |
987 | v9fs_blank_mistat(v9ses, mistat); | |
988 | strcpy(mistat->data + 1, symname); | |
989 | mistat->extension = mistat->data + 1; | |
990 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
991 | if (retval < 0) { | |
992 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
993 | FCALL_ERROR(fcall)); | |
994 | goto FreeFcall; | |
995 | } | |
996 | ||
997 | kfree(fcall); | |
998 | ||
3cf6429a LI |
999 | err = v9fs_t_clunk(v9ses, newfid->fid); |
1000 | if (err < 0) { | |
1001 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err); | |
2bad8471 EVH |
1002 | goto FreeFcall; |
1003 | } | |
1004 | ||
1005 | d_drop(dentry); /* FID - will this also clunk? */ | |
1006 | ||
1007 | FreeFcall: | |
1008 | kfree(mistat); | |
1009 | kfree(fcall); | |
1010 | ||
1011 | return retval; | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * v9fs_readlink - read a symlink's location (internal version) | |
1016 | * @dentry: dentry for symlink | |
73c592b9 | 1017 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1018 | * @buflen: length of buffer |
1019 | * | |
1020 | */ | |
1021 | ||
1022 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1023 | { | |
1024 | int retval = -EPERM; | |
1025 | ||
1026 | struct v9fs_fcall *fcall = NULL; | |
1027 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 1028 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1029 | |
1030 | if (!fid) { | |
1031 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
1032 | retval = -EBADF; | |
1033 | goto FreeFcall; | |
1034 | } | |
1035 | ||
1036 | if (!v9ses->extended) { | |
1037 | retval = -EBADF; | |
1038 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1039 | goto FreeFcall; | |
1040 | } | |
1041 | ||
1042 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1043 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1044 | ||
1045 | if (retval < 0) { | |
1046 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1047 | goto FreeFcall; | |
1048 | } | |
1049 | ||
1050 | if (!fcall) | |
1051 | return -EIO; | |
1052 | ||
1053 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { | |
1054 | retval = -EINVAL; | |
1055 | goto FreeFcall; | |
1056 | } | |
1057 | ||
1058 | /* copy extension buffer into buffer */ | |
1059 | if (strlen(fcall->params.rstat.stat->extension) < buflen) | |
1060 | buflen = strlen(fcall->params.rstat.stat->extension); | |
1061 | ||
1062 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); | |
1063 | ||
1064 | retval = buflen; | |
1065 | ||
1066 | FreeFcall: | |
1067 | kfree(fcall); | |
1068 | ||
1069 | return retval; | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * v9fs_vfs_readlink - read a symlink's location | |
1074 | * @dentry: dentry for symlink | |
1075 | * @buf: buffer to load symlink location into | |
1076 | * @buflen: length of buffer | |
1077 | * | |
1078 | */ | |
1079 | ||
1080 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1081 | int buflen) | |
1082 | { | |
1083 | int retval; | |
1084 | int ret; | |
1085 | char *link = __getname(); | |
1086 | ||
a1f9d8d2 LI |
1087 | if (buflen > PATH_MAX) |
1088 | buflen = PATH_MAX; | |
2bad8471 EVH |
1089 | |
1090 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1091 | ||
1092 | retval = v9fs_readlink(dentry, link, buflen); | |
1093 | ||
1094 | if (retval > 0) { | |
1095 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1096 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1097 | ret); | |
1098 | retval = ret; | |
1099 | } | |
1100 | } | |
1101 | ||
ce44eeb6 | 1102 | __putname(link); |
2bad8471 EVH |
1103 | return retval; |
1104 | } | |
1105 | ||
1106 | /** | |
1107 | * v9fs_vfs_follow_link - follow a symlink path | |
1108 | * @dentry: dentry for symlink | |
1109 | * @nd: nameidata | |
1110 | * | |
1111 | */ | |
1112 | ||
1113 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1114 | { | |
1115 | int len = 0; | |
1116 | char *link = __getname(); | |
1117 | ||
1118 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1119 | ||
1120 | if (!link) | |
1121 | link = ERR_PTR(-ENOMEM); | |
1122 | else { | |
1123 | len = v9fs_readlink(dentry, link, strlen(link)); | |
1124 | ||
1125 | if (len < 0) { | |
ce44eeb6 | 1126 | __putname(link); |
2bad8471 EVH |
1127 | link = ERR_PTR(len); |
1128 | } else | |
1129 | link[len] = 0; | |
1130 | } | |
1131 | nd_set_link(nd, link); | |
1132 | ||
1133 | return NULL; | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * v9fs_vfs_put_link - release a symlink path | |
1138 | * @dentry: dentry for symlink | |
1139 | * @nd: nameidata | |
1140 | * | |
1141 | */ | |
1142 | ||
1143 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1144 | { | |
1145 | char *s = nd_get_link(nd); | |
1146 | ||
1147 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1148 | if (!IS_ERR(s)) | |
ce44eeb6 | 1149 | __putname(s); |
2bad8471 EVH |
1150 | } |
1151 | ||
1152 | /** | |
1153 | * v9fs_vfs_link - create a hardlink | |
1154 | * @old_dentry: dentry for file to link to | |
1155 | * @dir: inode destination for new link | |
73c592b9 | 1156 | * @dentry: dentry for link |
2bad8471 EVH |
1157 | * |
1158 | */ | |
1159 | ||
1160 | /* XXX - lots of code dup'd from symlink and creates, | |
1161 | * figure out a better reuse strategy | |
1162 | */ | |
1163 | ||
1164 | static int | |
1165 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1166 | struct dentry *dentry) | |
1167 | { | |
1168 | int retval = -EPERM; | |
1169 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1170 | struct v9fs_fcall *fcall = NULL; | |
1171 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
0b8dd177 | 1172 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 EVH |
1173 | struct v9fs_fid *newfid = NULL; |
1174 | char *symname = __getname(); | |
3cf6429a | 1175 | int err; |
2bad8471 EVH |
1176 | |
1177 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1178 | old_dentry->d_name.name); | |
1179 | ||
1180 | if (!v9ses->extended) { | |
1181 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1182 | goto FreeMem; | |
1183 | } | |
1184 | ||
1185 | /* get fid of old_dentry */ | |
1186 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); | |
1187 | ||
1188 | /* issue a create */ | |
1189 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); | |
1190 | if (retval != 0) | |
1191 | goto FreeMem; | |
1192 | ||
0b8dd177 | 1193 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1194 | if (!newfid) { |
1195 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); | |
1196 | goto FreeMem; | |
1197 | } | |
1198 | ||
1199 | /* issue a twstat */ | |
1200 | v9fs_blank_mistat(v9ses, mistat); | |
1201 | strcpy(mistat->data + 1, symname); | |
1202 | mistat->extension = mistat->data + 1; | |
1203 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1204 | if (retval < 0) { | |
1205 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1206 | FCALL_ERROR(fcall)); | |
1207 | goto FreeMem; | |
1208 | } | |
1209 | ||
1210 | kfree(fcall); | |
1211 | ||
3cf6429a LI |
1212 | err = v9fs_t_clunk(v9ses, newfid->fid); |
1213 | ||
1214 | if (err < 0) { | |
1215 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err); | |
2bad8471 EVH |
1216 | goto FreeMem; |
1217 | } | |
1218 | ||
1219 | d_drop(dentry); /* FID - will this also clunk? */ | |
1220 | ||
1221 | kfree(fcall); | |
1222 | fcall = NULL; | |
1223 | ||
1224 | FreeMem: | |
1225 | kfree(mistat); | |
1226 | kfree(fcall); | |
ce44eeb6 | 1227 | __putname(symname); |
2bad8471 EVH |
1228 | return retval; |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * v9fs_vfs_mknod - create a special file | |
1233 | * @dir: inode destination for new link | |
1234 | * @dentry: dentry for file | |
1235 | * @mode: mode for creation | |
1236 | * @dev_t: device associated with special file | |
1237 | * | |
1238 | */ | |
1239 | ||
1240 | static int | |
1241 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1242 | { | |
1243 | int retval = -EPERM; | |
1244 | struct v9fs_fid *newfid; | |
1245 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1246 | struct v9fs_fcall *fcall = NULL; | |
1247 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1248 | char *symname = __getname(); | |
3cf6429a | 1249 | int err; |
2bad8471 EVH |
1250 | |
1251 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1252 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1253 | ||
73c592b9 EVH |
1254 | if (!mistat) |
1255 | return -ENOMEM; | |
1256 | ||
2bad8471 EVH |
1257 | if (!new_valid_dev(rdev)) { |
1258 | retval = -EINVAL; | |
1259 | goto FreeMem; | |
1260 | } | |
1261 | ||
1262 | if (!v9ses->extended) { | |
1263 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1264 | goto FreeMem; | |
1265 | } | |
1266 | ||
1267 | /* issue a create */ | |
1268 | retval = v9fs_create(dir, dentry, mode, 0); | |
1269 | ||
1270 | if (retval != 0) | |
1271 | goto FreeMem; | |
1272 | ||
0b8dd177 | 1273 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1274 | if (!newfid) { |
1275 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); | |
1276 | retval = -EINVAL; | |
1277 | goto FreeMem; | |
1278 | } | |
1279 | ||
1280 | /* build extension */ | |
1281 | if (S_ISBLK(mode)) | |
1282 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); | |
1283 | else if (S_ISCHR(mode)) | |
1284 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); | |
73c592b9 EVH |
1285 | else if (S_ISFIFO(mode)) |
1286 | ; /* DO NOTHING */ | |
2bad8471 EVH |
1287 | else { |
1288 | retval = -EINVAL; | |
1289 | goto FreeMem; | |
1290 | } | |
1291 | ||
1292 | if (!S_ISFIFO(mode)) { | |
1293 | /* issue a twstat */ | |
1294 | v9fs_blank_mistat(v9ses, mistat); | |
1295 | strcpy(mistat->data + 1, symname); | |
1296 | mistat->extension = mistat->data + 1; | |
1297 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1298 | if (retval < 0) { | |
1299 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1300 | FCALL_ERROR(fcall)); | |
1301 | goto FreeMem; | |
1302 | } | |
2bad8471 EVH |
1303 | } |
1304 | ||
1305 | /* need to update dcache so we show up */ | |
1306 | kfree(fcall); | |
1307 | ||
3cf6429a LI |
1308 | err = v9fs_t_clunk(v9ses, newfid->fid); |
1309 | if (err < 0) { | |
1310 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err); | |
2bad8471 EVH |
1311 | goto FreeMem; |
1312 | } | |
1313 | ||
1314 | d_drop(dentry); /* FID - will this also clunk? */ | |
1315 | ||
1316 | FreeMem: | |
1317 | kfree(mistat); | |
1318 | kfree(fcall); | |
ce44eeb6 | 1319 | __putname(symname); |
2bad8471 EVH |
1320 | |
1321 | return retval; | |
1322 | } | |
1323 | ||
b501611a | 1324 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1325 | .create = v9fs_vfs_create, |
1326 | .lookup = v9fs_vfs_lookup, | |
1327 | .symlink = v9fs_vfs_symlink, | |
1328 | .link = v9fs_vfs_link, | |
1329 | .unlink = v9fs_vfs_unlink, | |
1330 | .mkdir = v9fs_vfs_mkdir, | |
1331 | .rmdir = v9fs_vfs_rmdir, | |
1332 | .mknod = v9fs_vfs_mknod, | |
1333 | .rename = v9fs_vfs_rename, | |
1334 | .readlink = v9fs_vfs_readlink, | |
1335 | .getattr = v9fs_vfs_getattr, | |
1336 | .setattr = v9fs_vfs_setattr, | |
1337 | }; | |
1338 | ||
b501611a EVH |
1339 | static struct inode_operations v9fs_dir_inode_operations = { |
1340 | .create = v9fs_vfs_create, | |
1341 | .lookup = v9fs_vfs_lookup, | |
1342 | .unlink = v9fs_vfs_unlink, | |
1343 | .mkdir = v9fs_vfs_mkdir, | |
1344 | .rmdir = v9fs_vfs_rmdir, | |
1345 | .mknod = v9fs_vfs_mknod, | |
1346 | .rename = v9fs_vfs_rename, | |
1347 | .getattr = v9fs_vfs_getattr, | |
1348 | .setattr = v9fs_vfs_setattr, | |
1349 | }; | |
1350 | ||
2bad8471 EVH |
1351 | static struct inode_operations v9fs_file_inode_operations = { |
1352 | .getattr = v9fs_vfs_getattr, | |
1353 | .setattr = v9fs_vfs_setattr, | |
1354 | }; | |
1355 | ||
1356 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1357 | .readlink = v9fs_vfs_readlink, | |
1358 | .follow_link = v9fs_vfs_follow_link, | |
1359 | .put_link = v9fs_vfs_put_link, | |
1360 | .getattr = v9fs_vfs_getattr, | |
1361 | .setattr = v9fs_vfs_setattr, | |
1362 | }; |