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 | |
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; |
2bad8471 EVH |
321 | |
322 | perm = unixmode2p9mode(v9ses, perm); | |
323 | ||
324 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, | |
325 | file_dentry, perm, open_mode); | |
326 | ||
327 | if (!dirfid) | |
328 | return -EBADF; | |
329 | ||
330 | dirfidnum = dirfid->fid; | |
331 | if (dirfidnum < 0) { | |
332 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", | |
333 | dir->i_ino); | |
334 | return -EBADF; | |
335 | } | |
336 | ||
337 | if (file_dentry->d_inode) { | |
338 | dprintk(DEBUG_ERROR, | |
339 | "Odd. There is an inode for dir %lu, name :%s:\n", | |
340 | dir->i_ino, file_dentry->d_name.name); | |
341 | return -EEXIST; | |
342 | } | |
343 | ||
344 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
345 | if (newfid < 0) { | |
346 | eprintk(KERN_WARNING, "no free fids available\n"); | |
347 | return -ENOSPC; | |
348 | } | |
349 | ||
350 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); | |
351 | if (result < 0) { | |
352 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
353 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
0b8dd177 | 354 | newfid = -1; |
2bad8471 EVH |
355 | goto CleanUpFid; |
356 | } | |
357 | ||
358 | kfree(fcall); | |
359 | ||
360 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, | |
361 | perm, open_mode, &fcall); | |
362 | if (result < 0) { | |
363 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", | |
364 | FCALL_ERROR(fcall), result); | |
365 | ||
366 | goto CleanUpFid; | |
367 | } | |
368 | ||
369 | iounit = fcall->params.rcreate.iounit; | |
370 | qid = fcall->params.rcreate.qid; | |
371 | kfree(fcall); | |
372 | ||
0b8dd177 LI |
373 | fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1); |
374 | dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate); | |
2bad8471 EVH |
375 | if (!fid) { |
376 | result = -ENOMEM; | |
377 | goto CleanUpFid; | |
378 | } | |
379 | ||
2bad8471 EVH |
380 | fid->qid = qid; |
381 | fid->iounit = iounit; | |
0b8dd177 LI |
382 | |
383 | /* walk to the newly created file and put the fid in the dentry */ | |
384 | wfidno = v9fs_get_idpool(&v9ses->fidpool); | |
385 | if (newfid < 0) { | |
386 | eprintk(KERN_WARNING, "no free fids available\n"); | |
387 | return -ENOSPC; | |
388 | } | |
389 | ||
390 | result = v9fs_t_walk(v9ses, dirfidnum, wfidno, | |
391 | (char *) file_dentry->d_name.name, NULL); | |
392 | if (result < 0) { | |
393 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
394 | v9fs_put_idpool(wfidno, &v9ses->fidpool); | |
395 | wfidno = -1; | |
396 | goto CleanUpFid; | |
397 | } | |
398 | ||
399 | if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) { | |
400 | if (!v9fs_t_clunk(v9ses, newfid, &fcall)) { | |
401 | v9fs_put_idpool(wfidno, &v9ses->fidpool); | |
402 | } | |
403 | ||
404 | goto CleanUpFid; | |
405 | } | |
2bad8471 EVH |
406 | |
407 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || | |
408 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || | |
409 | (perm & V9FS_DMDEVICE)) | |
410 | return 0; | |
411 | ||
412 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
413 | if (result < 0) { | |
414 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), | |
415 | result); | |
416 | goto CleanUpFid; | |
417 | } | |
418 | ||
419 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
420 | ||
421 | file_inode = v9fs_get_inode(sb, newstat.st_mode); | |
422 | if ((!file_inode) || IS_ERR(file_inode)) { | |
423 | dprintk(DEBUG_ERROR, "create inode failed\n"); | |
424 | result = -EBADF; | |
425 | goto CleanUpFid; | |
426 | } | |
427 | ||
428 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); | |
429 | kfree(fcall); | |
a93a117e LI |
430 | fcall = NULL; |
431 | file_dentry->d_op = &v9fs_dentry_operations; | |
2bad8471 EVH |
432 | d_instantiate(file_dentry, file_inode); |
433 | ||
434 | if (perm & V9FS_DMDIR) { | |
0b8dd177 LI |
435 | if (!v9fs_t_clunk(v9ses, newfid, &fcall)) |
436 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
437 | else | |
2bad8471 EVH |
438 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", |
439 | FCALL_ERROR(fcall)); | |
2bad8471 EVH |
440 | kfree(fcall); |
441 | fid->fidopen = 0; | |
442 | fid->fidcreate = 0; | |
443 | d_drop(file_dentry); | |
444 | } | |
445 | ||
446 | return 0; | |
447 | ||
448 | CleanUpFid: | |
449 | kfree(fcall); | |
450 | ||
0b8dd177 LI |
451 | if (newfid >= 0) { |
452 | if (!v9fs_t_clunk(v9ses, newfid, &fcall)) | |
453 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
454 | else | |
455 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", | |
456 | FCALL_ERROR(fcall)); | |
457 | ||
458 | kfree(fcall); | |
459 | } | |
460 | if (wfidno >= 0) { | |
461 | if (!v9fs_t_clunk(v9ses, wfidno, &fcall)) | |
462 | v9fs_put_idpool(wfidno, &v9ses->fidpool); | |
463 | else | |
2bad8471 EVH |
464 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", |
465 | FCALL_ERROR(fcall)); | |
466 | ||
2bad8471 EVH |
467 | kfree(fcall); |
468 | } | |
469 | return result; | |
470 | } | |
471 | ||
472 | /** | |
473 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
474 | * @dir: directory inode that is being deleted |
475 | * @file: dentry that is being deleted | |
476 | * @rmdir: removing a directory | |
2bad8471 EVH |
477 | * |
478 | */ | |
479 | ||
480 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
481 | { | |
482 | struct v9fs_fcall *fcall = NULL; | |
483 | struct super_block *sb = NULL; | |
484 | struct v9fs_session_info *v9ses = NULL; | |
485 | struct v9fs_fid *v9fid = NULL; | |
486 | struct inode *file_inode = NULL; | |
487 | int fid = -1; | |
488 | int result = 0; | |
489 | ||
490 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
491 | rmdir); | |
492 | ||
493 | file_inode = file->d_inode; | |
494 | sb = file_inode->i_sb; | |
495 | v9ses = v9fs_inode2v9ses(file_inode); | |
0b8dd177 | 496 | v9fid = v9fs_fid_lookup(file); |
2bad8471 EVH |
497 | |
498 | if (!v9fid) { | |
499 | dprintk(DEBUG_ERROR, | |
500 | "no v9fs_fid\n"); | |
501 | return -EBADF; | |
502 | } | |
503 | ||
504 | fid = v9fid->fid; | |
505 | if (fid < 0) { | |
506 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
507 | file_inode->i_ino); | |
508 | return -EBADF; | |
509 | } | |
510 | ||
511 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
512 | if (result < 0) | |
513 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", | |
514 | FCALL_ERROR(fcall), result); | |
515 | else { | |
516 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
517 | v9fs_fid_destroy(v9fid); | |
518 | } | |
519 | ||
520 | kfree(fcall); | |
521 | return result; | |
522 | } | |
523 | ||
524 | /** | |
525 | * v9fs_vfs_create - VFS hook to create files | |
526 | * @inode: directory inode that is being deleted | |
527 | * @dentry: dentry that is being deleted | |
528 | * @perm: create permissions | |
529 | * @nd: path information | |
530 | * | |
531 | */ | |
532 | ||
533 | static int | |
534 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, | |
535 | struct nameidata *nd) | |
536 | { | |
537 | return v9fs_create(inode, dentry, perm, O_RDWR); | |
538 | } | |
539 | ||
540 | /** | |
541 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 542 | * @inode: inode that is being unlinked |
2bad8471 EVH |
543 | * @dentry: dentry that is being unlinked |
544 | * @mode: mode for new directory | |
545 | * | |
546 | */ | |
547 | ||
548 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) | |
549 | { | |
550 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); | |
551 | } | |
552 | ||
553 | /** | |
554 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
555 | * @dir: inode that is being walked from | |
556 | * @dentry: dentry that is being walked to? | |
557 | * @nameidata: path data | |
558 | * | |
559 | */ | |
560 | ||
561 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
562 | struct nameidata *nameidata) | |
563 | { | |
564 | struct super_block *sb; | |
565 | struct v9fs_session_info *v9ses; | |
566 | struct v9fs_fid *dirfid; | |
567 | struct v9fs_fid *fid; | |
568 | struct inode *inode; | |
569 | struct v9fs_fcall *fcall = NULL; | |
570 | struct stat newstat; | |
571 | int dirfidnum = -1; | |
572 | int newfid = -1; | |
573 | int result = 0; | |
574 | ||
575 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
576 | dir, dentry->d_iname, dentry, nameidata); | |
577 | ||
578 | sb = dir->i_sb; | |
579 | v9ses = v9fs_inode2v9ses(dir); | |
0b8dd177 | 580 | dirfid = v9fs_fid_lookup(dentry->d_parent); |
2bad8471 EVH |
581 | |
582 | if (!dirfid) { | |
583 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
584 | return ERR_PTR(-EINVAL); | |
585 | } | |
586 | ||
587 | dirfidnum = dirfid->fid; | |
588 | ||
589 | if (dirfidnum < 0) { | |
590 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
591 | dir, dir->i_ino); | |
592 | return ERR_PTR(-EBADF); | |
593 | } | |
594 | ||
595 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
596 | if (newfid < 0) { | |
597 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
598 | return ERR_PTR(-ENOSPC); | |
599 | } | |
600 | ||
601 | result = | |
602 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, | |
603 | NULL); | |
604 | if (result < 0) { | |
605 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
606 | if (result == -ENOENT) { | |
607 | d_add(dentry, NULL); | |
0b8dd177 | 608 | dprintk(DEBUG_VFS, |
2bad8471 EVH |
609 | "Return negative dentry %p count %d\n", |
610 | dentry, atomic_read(&dentry->d_count)); | |
611 | return NULL; | |
612 | } | |
613 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
614 | goto FreeFcall; | |
615 | } | |
616 | ||
617 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
618 | if (result < 0) { | |
619 | dprintk(DEBUG_ERROR, "stat error\n"); | |
620 | goto FreeFcall; | |
621 | } | |
622 | ||
623 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
624 | inode = v9fs_get_inode(sb, newstat.st_mode); | |
625 | ||
626 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
627 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
628 | PTR_ERR(inode)); | |
629 | ||
630 | result = -ENOSPC; | |
631 | goto FreeFcall; | |
632 | } | |
633 | ||
634 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
635 | ||
0b8dd177 | 636 | fid = v9fs_fid_create(dentry, v9ses, newfid, 0); |
2bad8471 EVH |
637 | if (fid == NULL) { |
638 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
639 | result = -ENOMEM; | |
640 | goto FreeFcall; | |
641 | } | |
642 | ||
2bad8471 EVH |
643 | fid->qid = fcall->params.rstat.stat->qid; |
644 | ||
645 | dentry->d_op = &v9fs_dentry_operations; | |
646 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); | |
647 | ||
648 | d_add(dentry, inode); | |
649 | kfree(fcall); | |
650 | ||
651 | return NULL; | |
652 | ||
653 | FreeFcall: | |
654 | kfree(fcall); | |
655 | return ERR_PTR(result); | |
656 | } | |
657 | ||
658 | /** | |
659 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
660 | * @i: inode that is being unlinked | |
73c592b9 | 661 | * @d: dentry that is being unlinked |
2bad8471 EVH |
662 | * |
663 | */ | |
664 | ||
665 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
666 | { | |
667 | return v9fs_remove(i, d, 0); | |
668 | } | |
669 | ||
670 | /** | |
671 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
672 | * @i: inode that is being unlinked | |
73c592b9 | 673 | * @d: dentry that is being unlinked |
2bad8471 EVH |
674 | * |
675 | */ | |
676 | ||
677 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
678 | { | |
679 | return v9fs_remove(i, d, 1); | |
680 | } | |
681 | ||
682 | /** | |
683 | * v9fs_vfs_rename - VFS hook to rename an inode | |
684 | * @old_dir: old dir inode | |
685 | * @old_dentry: old dentry | |
686 | * @new_dir: new dir inode | |
687 | * @new_dentry: new dentry | |
688 | * | |
689 | */ | |
690 | ||
691 | static int | |
692 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
693 | struct inode *new_dir, struct dentry *new_dentry) | |
694 | { | |
695 | struct inode *old_inode = old_dentry->d_inode; | |
696 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
0b8dd177 | 697 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 | 698 | struct v9fs_fid *olddirfid = |
0b8dd177 | 699 | v9fs_fid_lookup(old_dentry->d_parent); |
2bad8471 | 700 | struct v9fs_fid *newdirfid = |
0b8dd177 | 701 | v9fs_fid_lookup(new_dentry->d_parent); |
2bad8471 EVH |
702 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
703 | struct v9fs_fcall *fcall = NULL; | |
704 | int fid = -1; | |
705 | int olddirfidnum = -1; | |
706 | int newdirfidnum = -1; | |
707 | int retval = 0; | |
708 | ||
709 | dprintk(DEBUG_VFS, "\n"); | |
710 | ||
73c592b9 EVH |
711 | if (!mistat) |
712 | return -ENOMEM; | |
713 | ||
2bad8471 EVH |
714 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { |
715 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
716 | return -EBADF; | |
717 | } | |
718 | ||
719 | /* 9P can only handle file rename in the same directory */ | |
720 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
721 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
722 | retval = -EPERM; | |
723 | goto FreeFcallnBail; | |
724 | } | |
725 | ||
726 | fid = oldfid->fid; | |
727 | olddirfidnum = olddirfid->fid; | |
728 | newdirfidnum = newdirfid->fid; | |
729 | ||
730 | if (fid < 0) { | |
731 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
732 | old_inode->i_ino); | |
733 | retval = -EBADF; | |
734 | goto FreeFcallnBail; | |
735 | } | |
736 | ||
737 | v9fs_blank_mistat(v9ses, mistat); | |
738 | ||
739 | strcpy(mistat->data + 1, v9ses->name); | |
740 | mistat->name = mistat->data + 1 + strlen(v9ses->name); | |
741 | ||
742 | if (new_dentry->d_name.len > | |
743 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { | |
744 | dprintk(DEBUG_ERROR, "new name too long\n"); | |
745 | goto FreeFcallnBail; | |
746 | } | |
747 | ||
748 | strcpy(mistat->name, new_dentry->d_name.name); | |
749 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); | |
750 | ||
751 | FreeFcallnBail: | |
752 | kfree(mistat); | |
753 | ||
754 | if (retval < 0) | |
755 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
756 | FCALL_ERROR(fcall)); | |
757 | ||
758 | kfree(fcall); | |
759 | return retval; | |
760 | } | |
761 | ||
762 | /** | |
763 | * v9fs_vfs_getattr - retreive file metadata | |
764 | * @mnt - mount information | |
765 | * @dentry - file to get attributes on | |
766 | * @stat - metadata structure to populate | |
767 | * | |
768 | */ | |
769 | ||
770 | static int | |
771 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
772 | struct kstat *stat) | |
773 | { | |
774 | struct v9fs_fcall *fcall = NULL; | |
775 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 776 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
777 | int err = -EPERM; |
778 | ||
779 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
780 | if (!fid) { | |
781 | dprintk(DEBUG_ERROR, | |
782 | "couldn't find fid associated with dentry\n"); | |
783 | return -EBADF; | |
784 | } | |
785 | ||
786 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
787 | ||
788 | if (err < 0) | |
789 | dprintk(DEBUG_ERROR, "stat error\n"); | |
790 | else { | |
791 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, | |
792 | dentry->d_inode->i_sb); | |
793 | generic_fillattr(dentry->d_inode, stat); | |
794 | } | |
795 | ||
796 | kfree(fcall); | |
797 | return err; | |
798 | } | |
799 | ||
800 | /** | |
801 | * v9fs_vfs_setattr - set file metadata | |
802 | * @dentry: file whose metadata to set | |
803 | * @iattr: metadata assignment structure | |
804 | * | |
805 | */ | |
806 | ||
807 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
808 | { | |
809 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 810 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 | 811 | struct v9fs_fcall *fcall = NULL; |
73c592b9 | 812 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
2bad8471 EVH |
813 | int res = -EPERM; |
814 | ||
815 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 EVH |
816 | |
817 | if (!mistat) | |
818 | return -ENOMEM; | |
819 | ||
2bad8471 EVH |
820 | if (!fid) { |
821 | dprintk(DEBUG_ERROR, | |
822 | "Couldn't find fid associated with dentry\n"); | |
823 | return -EBADF; | |
824 | } | |
825 | ||
2bad8471 EVH |
826 | v9fs_blank_mistat(v9ses, mistat); |
827 | if (iattr->ia_valid & ATTR_MODE) | |
828 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); | |
829 | ||
830 | if (iattr->ia_valid & ATTR_MTIME) | |
831 | mistat->mtime = iattr->ia_mtime.tv_sec; | |
832 | ||
833 | if (iattr->ia_valid & ATTR_ATIME) | |
834 | mistat->atime = iattr->ia_atime.tv_sec; | |
835 | ||
836 | if (iattr->ia_valid & ATTR_SIZE) | |
837 | mistat->length = iattr->ia_size; | |
838 | ||
839 | if (v9ses->extended) { | |
73c592b9 | 840 | char *ptr = mistat->data+1; |
2bad8471 EVH |
841 | |
842 | if (iattr->ia_valid & ATTR_UID) { | |
73c592b9 EVH |
843 | mistat->uid = ptr; |
844 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); | |
2bad8471 EVH |
845 | mistat->n_uid = iattr->ia_uid; |
846 | } | |
847 | ||
848 | if (iattr->ia_valid & ATTR_GID) { | |
73c592b9 EVH |
849 | mistat->gid = ptr; |
850 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); | |
2bad8471 EVH |
851 | mistat->n_gid = iattr->ia_gid; |
852 | } | |
2bad8471 EVH |
853 | } |
854 | ||
855 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); | |
856 | ||
857 | if (res < 0) | |
858 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); | |
859 | ||
860 | kfree(mistat); | |
861 | kfree(fcall); | |
862 | ||
863 | if (res >= 0) | |
864 | res = inode_setattr(dentry->d_inode, iattr); | |
865 | ||
866 | return res; | |
867 | } | |
868 | ||
869 | /** | |
870 | * v9fs_mistat2inode - populate an inode structure with mistat info | |
871 | * @mistat: Plan 9 metadata (mistat) structure | |
872 | * @inode: inode to populate | |
873 | * @sb: superblock of filesystem | |
874 | * | |
875 | */ | |
876 | ||
877 | void | |
878 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, | |
879 | struct super_block *sb) | |
880 | { | |
881 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
882 | ||
883 | inode->i_nlink = 1; | |
884 | ||
885 | inode->i_atime.tv_sec = mistat->atime; | |
886 | inode->i_mtime.tv_sec = mistat->mtime; | |
887 | inode->i_ctime.tv_sec = mistat->mtime; | |
888 | ||
889 | inode->i_uid = -1; | |
890 | inode->i_gid = -1; | |
891 | ||
892 | if (v9ses->extended) { | |
893 | /* TODO: string to uid mapping via user-space daemon */ | |
894 | inode->i_uid = mistat->n_uid; | |
895 | inode->i_gid = mistat->n_gid; | |
896 | ||
897 | if (mistat->n_uid == -1) | |
898 | sscanf(mistat->uid, "%x", &inode->i_uid); | |
899 | ||
900 | if (mistat->n_gid == -1) | |
901 | sscanf(mistat->gid, "%x", &inode->i_gid); | |
902 | } | |
903 | ||
904 | if (inode->i_uid == -1) | |
905 | inode->i_uid = v9ses->uid; | |
906 | if (inode->i_gid == -1) | |
907 | inode->i_gid = v9ses->gid; | |
908 | ||
909 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); | |
910 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { | |
911 | char type = 0; | |
912 | int major = -1; | |
913 | int minor = -1; | |
914 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
915 | switch (type) { | |
916 | case 'c': | |
917 | inode->i_mode &= ~S_IFBLK; | |
918 | inode->i_mode |= S_IFCHR; | |
919 | break; | |
920 | case 'b': | |
921 | break; | |
922 | default: | |
923 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
924 | type, mistat->extension); | |
925 | }; | |
926 | inode->i_rdev = MKDEV(major, minor); | |
927 | } else | |
928 | inode->i_rdev = 0; | |
929 | ||
930 | inode->i_size = mistat->length; | |
931 | ||
932 | inode->i_blksize = sb->s_blocksize; | |
933 | inode->i_blocks = | |
934 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
935 | } | |
936 | ||
937 | /** | |
938 | * v9fs_qid2ino - convert qid into inode number | |
939 | * @qid: qid to hash | |
940 | * | |
941 | * BUG: potential for inode number collisions? | |
942 | */ | |
943 | ||
944 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
945 | { | |
946 | u64 path = qid->path + 2; | |
947 | ino_t i = 0; | |
948 | ||
949 | if (sizeof(ino_t) == sizeof(path)) | |
950 | memcpy(&i, &path, sizeof(ino_t)); | |
951 | else | |
952 | i = (ino_t) (path ^ (path >> 32)); | |
953 | ||
954 | return i; | |
955 | } | |
956 | ||
957 | /** | |
958 | * v9fs_vfs_symlink - helper function to create symlinks | |
959 | * @dir: directory inode containing symlink | |
960 | * @dentry: dentry for symlink | |
961 | * @symname: symlink data | |
962 | * | |
963 | * See 9P2000.u RFC for more information | |
964 | * | |
965 | */ | |
966 | ||
967 | static int | |
968 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
969 | { | |
970 | int retval = -EPERM; | |
971 | struct v9fs_fid *newfid; | |
972 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
2bad8471 EVH |
973 | struct v9fs_fcall *fcall = NULL; |
974 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
975 | ||
976 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
977 | symname); | |
978 | ||
73c592b9 EVH |
979 | if (!mistat) |
980 | return -ENOMEM; | |
2bad8471 EVH |
981 | |
982 | if (!v9ses->extended) { | |
983 | dprintk(DEBUG_ERROR, "not extended\n"); | |
984 | goto FreeFcall; | |
985 | } | |
986 | ||
987 | /* issue a create */ | |
988 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); | |
989 | if (retval != 0) | |
990 | goto FreeFcall; | |
991 | ||
0b8dd177 | 992 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
993 | |
994 | /* issue a twstat */ | |
995 | v9fs_blank_mistat(v9ses, mistat); | |
996 | strcpy(mistat->data + 1, symname); | |
997 | mistat->extension = mistat->data + 1; | |
998 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
999 | if (retval < 0) { | |
1000 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1001 | FCALL_ERROR(fcall)); | |
1002 | goto FreeFcall; | |
1003 | } | |
1004 | ||
1005 | kfree(fcall); | |
1006 | ||
1007 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1008 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1009 | FCALL_ERROR(fcall)); | |
1010 | goto FreeFcall; | |
1011 | } | |
1012 | ||
1013 | d_drop(dentry); /* FID - will this also clunk? */ | |
1014 | ||
1015 | FreeFcall: | |
1016 | kfree(mistat); | |
1017 | kfree(fcall); | |
1018 | ||
1019 | return retval; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * v9fs_readlink - read a symlink's location (internal version) | |
1024 | * @dentry: dentry for symlink | |
73c592b9 | 1025 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
1026 | * @buflen: length of buffer |
1027 | * | |
1028 | */ | |
1029 | ||
1030 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1031 | { | |
1032 | int retval = -EPERM; | |
1033 | ||
1034 | struct v9fs_fcall *fcall = NULL; | |
1035 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
0b8dd177 | 1036 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1037 | |
1038 | if (!fid) { | |
1039 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
1040 | retval = -EBADF; | |
1041 | goto FreeFcall; | |
1042 | } | |
1043 | ||
1044 | if (!v9ses->extended) { | |
1045 | retval = -EBADF; | |
1046 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1047 | goto FreeFcall; | |
1048 | } | |
1049 | ||
1050 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1051 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1052 | ||
1053 | if (retval < 0) { | |
1054 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1055 | goto FreeFcall; | |
1056 | } | |
1057 | ||
1058 | if (!fcall) | |
1059 | return -EIO; | |
1060 | ||
1061 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { | |
1062 | retval = -EINVAL; | |
1063 | goto FreeFcall; | |
1064 | } | |
1065 | ||
1066 | /* copy extension buffer into buffer */ | |
1067 | if (strlen(fcall->params.rstat.stat->extension) < buflen) | |
1068 | buflen = strlen(fcall->params.rstat.stat->extension); | |
1069 | ||
1070 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); | |
1071 | ||
1072 | retval = buflen; | |
1073 | ||
1074 | FreeFcall: | |
1075 | kfree(fcall); | |
1076 | ||
1077 | return retval; | |
1078 | } | |
1079 | ||
1080 | /** | |
1081 | * v9fs_vfs_readlink - read a symlink's location | |
1082 | * @dentry: dentry for symlink | |
1083 | * @buf: buffer to load symlink location into | |
1084 | * @buflen: length of buffer | |
1085 | * | |
1086 | */ | |
1087 | ||
1088 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1089 | int buflen) | |
1090 | { | |
1091 | int retval; | |
1092 | int ret; | |
1093 | char *link = __getname(); | |
1094 | ||
a1f9d8d2 LI |
1095 | if (buflen > PATH_MAX) |
1096 | buflen = PATH_MAX; | |
2bad8471 EVH |
1097 | |
1098 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1099 | ||
1100 | retval = v9fs_readlink(dentry, link, buflen); | |
1101 | ||
1102 | if (retval > 0) { | |
1103 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1104 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1105 | ret); | |
1106 | retval = ret; | |
1107 | } | |
1108 | } | |
1109 | ||
ce44eeb6 | 1110 | __putname(link); |
2bad8471 EVH |
1111 | return retval; |
1112 | } | |
1113 | ||
1114 | /** | |
1115 | * v9fs_vfs_follow_link - follow a symlink path | |
1116 | * @dentry: dentry for symlink | |
1117 | * @nd: nameidata | |
1118 | * | |
1119 | */ | |
1120 | ||
1121 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1122 | { | |
1123 | int len = 0; | |
1124 | char *link = __getname(); | |
1125 | ||
1126 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1127 | ||
1128 | if (!link) | |
1129 | link = ERR_PTR(-ENOMEM); | |
1130 | else { | |
1131 | len = v9fs_readlink(dentry, link, strlen(link)); | |
1132 | ||
1133 | if (len < 0) { | |
ce44eeb6 | 1134 | __putname(link); |
2bad8471 EVH |
1135 | link = ERR_PTR(len); |
1136 | } else | |
1137 | link[len] = 0; | |
1138 | } | |
1139 | nd_set_link(nd, link); | |
1140 | ||
1141 | return NULL; | |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * v9fs_vfs_put_link - release a symlink path | |
1146 | * @dentry: dentry for symlink | |
1147 | * @nd: nameidata | |
1148 | * | |
1149 | */ | |
1150 | ||
1151 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1152 | { | |
1153 | char *s = nd_get_link(nd); | |
1154 | ||
1155 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1156 | if (!IS_ERR(s)) | |
ce44eeb6 | 1157 | __putname(s); |
2bad8471 EVH |
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 | |
73c592b9 | 1164 | * @dentry: dentry for link |
2bad8471 EVH |
1165 | * |
1166 | */ | |
1167 | ||
1168 | /* XXX - lots of code dup'd from symlink and creates, | |
1169 | * figure out a better reuse strategy | |
1170 | */ | |
1171 | ||
1172 | static int | |
1173 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1174 | struct dentry *dentry) | |
1175 | { | |
1176 | int retval = -EPERM; | |
1177 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1178 | struct v9fs_fcall *fcall = NULL; | |
1179 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
0b8dd177 | 1180 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); |
2bad8471 EVH |
1181 | struct v9fs_fid *newfid = NULL; |
1182 | char *symname = __getname(); | |
1183 | ||
1184 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1185 | old_dentry->d_name.name); | |
1186 | ||
1187 | if (!v9ses->extended) { | |
1188 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1189 | goto FreeMem; | |
1190 | } | |
1191 | ||
1192 | /* get fid of old_dentry */ | |
1193 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); | |
1194 | ||
1195 | /* issue a create */ | |
1196 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); | |
1197 | if (retval != 0) | |
1198 | goto FreeMem; | |
1199 | ||
0b8dd177 | 1200 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1201 | if (!newfid) { |
1202 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); | |
1203 | goto FreeMem; | |
1204 | } | |
1205 | ||
1206 | /* issue a twstat */ | |
1207 | v9fs_blank_mistat(v9ses, mistat); | |
1208 | strcpy(mistat->data + 1, symname); | |
1209 | mistat->extension = mistat->data + 1; | |
1210 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1211 | if (retval < 0) { | |
1212 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1213 | FCALL_ERROR(fcall)); | |
1214 | goto FreeMem; | |
1215 | } | |
1216 | ||
1217 | kfree(fcall); | |
1218 | ||
1219 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1220 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1221 | FCALL_ERROR(fcall)); | |
1222 | goto FreeMem; | |
1223 | } | |
1224 | ||
1225 | d_drop(dentry); /* FID - will this also clunk? */ | |
1226 | ||
1227 | kfree(fcall); | |
1228 | fcall = NULL; | |
1229 | ||
1230 | FreeMem: | |
1231 | kfree(mistat); | |
1232 | kfree(fcall); | |
ce44eeb6 | 1233 | __putname(symname); |
2bad8471 EVH |
1234 | return retval; |
1235 | } | |
1236 | ||
1237 | /** | |
1238 | * v9fs_vfs_mknod - create a special file | |
1239 | * @dir: inode destination for new link | |
1240 | * @dentry: dentry for file | |
1241 | * @mode: mode for creation | |
1242 | * @dev_t: device associated with special file | |
1243 | * | |
1244 | */ | |
1245 | ||
1246 | static int | |
1247 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1248 | { | |
1249 | int retval = -EPERM; | |
1250 | struct v9fs_fid *newfid; | |
1251 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1252 | struct v9fs_fcall *fcall = NULL; | |
1253 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1254 | char *symname = __getname(); | |
1255 | ||
1256 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1257 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1258 | ||
73c592b9 EVH |
1259 | if (!mistat) |
1260 | return -ENOMEM; | |
1261 | ||
2bad8471 EVH |
1262 | if (!new_valid_dev(rdev)) { |
1263 | retval = -EINVAL; | |
1264 | goto FreeMem; | |
1265 | } | |
1266 | ||
1267 | if (!v9ses->extended) { | |
1268 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1269 | goto FreeMem; | |
1270 | } | |
1271 | ||
1272 | /* issue a create */ | |
1273 | retval = v9fs_create(dir, dentry, mode, 0); | |
1274 | ||
1275 | if (retval != 0) | |
1276 | goto FreeMem; | |
1277 | ||
0b8dd177 | 1278 | newfid = v9fs_fid_lookup(dentry); |
2bad8471 EVH |
1279 | if (!newfid) { |
1280 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); | |
1281 | retval = -EINVAL; | |
1282 | goto FreeMem; | |
1283 | } | |
1284 | ||
1285 | /* build extension */ | |
1286 | if (S_ISBLK(mode)) | |
1287 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); | |
1288 | else if (S_ISCHR(mode)) | |
1289 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); | |
73c592b9 EVH |
1290 | else if (S_ISFIFO(mode)) |
1291 | ; /* DO NOTHING */ | |
2bad8471 EVH |
1292 | else { |
1293 | retval = -EINVAL; | |
1294 | goto FreeMem; | |
1295 | } | |
1296 | ||
1297 | if (!S_ISFIFO(mode)) { | |
1298 | /* issue a twstat */ | |
1299 | v9fs_blank_mistat(v9ses, mistat); | |
1300 | strcpy(mistat->data + 1, symname); | |
1301 | mistat->extension = mistat->data + 1; | |
1302 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1303 | if (retval < 0) { | |
1304 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1305 | FCALL_ERROR(fcall)); | |
1306 | goto FreeMem; | |
1307 | } | |
2bad8471 EVH |
1308 | } |
1309 | ||
1310 | /* need to update dcache so we show up */ | |
1311 | kfree(fcall); | |
1312 | ||
1313 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1314 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1315 | FCALL_ERROR(fcall)); | |
1316 | goto FreeMem; | |
1317 | } | |
1318 | ||
1319 | d_drop(dentry); /* FID - will this also clunk? */ | |
1320 | ||
1321 | FreeMem: | |
1322 | kfree(mistat); | |
1323 | kfree(fcall); | |
ce44eeb6 | 1324 | __putname(symname); |
2bad8471 EVH |
1325 | |
1326 | return retval; | |
1327 | } | |
1328 | ||
b501611a | 1329 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1330 | .create = v9fs_vfs_create, |
1331 | .lookup = v9fs_vfs_lookup, | |
1332 | .symlink = v9fs_vfs_symlink, | |
1333 | .link = v9fs_vfs_link, | |
1334 | .unlink = v9fs_vfs_unlink, | |
1335 | .mkdir = v9fs_vfs_mkdir, | |
1336 | .rmdir = v9fs_vfs_rmdir, | |
1337 | .mknod = v9fs_vfs_mknod, | |
1338 | .rename = v9fs_vfs_rename, | |
1339 | .readlink = v9fs_vfs_readlink, | |
1340 | .getattr = v9fs_vfs_getattr, | |
1341 | .setattr = v9fs_vfs_setattr, | |
1342 | }; | |
1343 | ||
b501611a EVH |
1344 | static struct inode_operations v9fs_dir_inode_operations = { |
1345 | .create = v9fs_vfs_create, | |
1346 | .lookup = v9fs_vfs_lookup, | |
1347 | .unlink = v9fs_vfs_unlink, | |
1348 | .mkdir = v9fs_vfs_mkdir, | |
1349 | .rmdir = v9fs_vfs_rmdir, | |
1350 | .mknod = v9fs_vfs_mknod, | |
1351 | .rename = v9fs_vfs_rename, | |
1352 | .getattr = v9fs_vfs_getattr, | |
1353 | .setattr = v9fs_vfs_setattr, | |
1354 | }; | |
1355 | ||
2bad8471 EVH |
1356 | static struct inode_operations v9fs_file_inode_operations = { |
1357 | .getattr = v9fs_vfs_getattr, | |
1358 | .setattr = v9fs_vfs_setattr, | |
1359 | }; | |
1360 | ||
1361 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1362 | .readlink = v9fs_vfs_readlink, | |
1363 | .follow_link = v9fs_vfs_follow_link, | |
1364 | .put_link = v9fs_vfs_put_link, | |
1365 | .getattr = v9fs_vfs_getattr, | |
1366 | .setattr = v9fs_vfs_setattr, | |
1367 | }; |