Commit | Line | Data |
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2bad8471 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_inode.c | |
3 | * | |
4 | * This file contians vfs inode ops for the 9P2000 protocol. | |
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; | |
47 | static struct inode_operations v9fs_file_inode_operations; | |
48 | static struct inode_operations v9fs_symlink_inode_operations; | |
49 | ||
50 | /** | |
51 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
52 | * @v9ses: v9fs session information | |
53 | * @mode: mode to convert | |
54 | * | |
55 | */ | |
56 | ||
57 | static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) | |
58 | { | |
59 | int res; | |
60 | res = mode & 0777; | |
61 | if (S_ISDIR(mode)) | |
62 | res |= V9FS_DMDIR; | |
63 | if (v9ses->extended) { | |
64 | if (S_ISLNK(mode)) | |
65 | res |= V9FS_DMSYMLINK; | |
66 | if (v9ses->nodev == 0) { | |
67 | if (S_ISSOCK(mode)) | |
68 | res |= V9FS_DMSOCKET; | |
69 | if (S_ISFIFO(mode)) | |
70 | res |= V9FS_DMNAMEDPIPE; | |
71 | if (S_ISBLK(mode)) | |
72 | res |= V9FS_DMDEVICE; | |
73 | if (S_ISCHR(mode)) | |
74 | res |= V9FS_DMDEVICE; | |
75 | } | |
76 | ||
77 | if ((mode & S_ISUID) == S_ISUID) | |
78 | res |= V9FS_DMSETUID; | |
79 | if ((mode & S_ISGID) == S_ISGID) | |
80 | res |= V9FS_DMSETGID; | |
81 | if ((mode & V9FS_DMLINK)) | |
82 | res |= V9FS_DMLINK; | |
83 | } | |
84 | ||
85 | return res; | |
86 | } | |
87 | ||
88 | /** | |
89 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
90 | * @v9ses: v9fs session information | |
91 | * @mode: mode to convert | |
92 | * | |
93 | */ | |
94 | ||
95 | static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) | |
96 | { | |
97 | int res; | |
98 | ||
99 | res = mode & 0777; | |
100 | ||
101 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) | |
102 | res |= S_IFDIR; | |
103 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) | |
104 | res |= S_IFLNK; | |
105 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) | |
106 | && (v9ses->nodev == 0)) | |
107 | res |= S_IFSOCK; | |
108 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) | |
109 | && (v9ses->nodev == 0)) | |
110 | res |= S_IFIFO; | |
111 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) | |
112 | && (v9ses->nodev == 0)) | |
113 | res |= S_IFBLK; | |
114 | else | |
115 | res |= S_IFREG; | |
116 | ||
117 | if (v9ses->extended) { | |
118 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) | |
119 | res |= S_ISUID; | |
120 | ||
121 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) | |
122 | res |= S_ISGID; | |
123 | } | |
124 | ||
125 | return res; | |
126 | } | |
127 | ||
128 | /** | |
129 | * v9fs_blank_mistat - helper function to setup a 9P stat structure | |
130 | * @v9ses: 9P session info (for determining extended mode) | |
131 | * @mistat: structure to initialize | |
132 | * | |
133 | */ | |
134 | ||
135 | static inline void | |
136 | v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat) | |
137 | { | |
138 | mistat->type = ~0; | |
139 | mistat->dev = ~0; | |
140 | mistat->qid.type = ~0; | |
141 | mistat->qid.version = ~0; | |
142 | *((long long *)&mistat->qid.path) = ~0; | |
143 | mistat->mode = ~0; | |
144 | mistat->atime = ~0; | |
145 | mistat->mtime = ~0; | |
146 | mistat->length = ~0; | |
147 | mistat->name = mistat->data; | |
148 | mistat->uid = mistat->data; | |
149 | mistat->gid = mistat->data; | |
150 | mistat->muid = mistat->data; | |
151 | if (v9ses->extended) { | |
152 | mistat->n_uid = ~0; | |
153 | mistat->n_gid = ~0; | |
154 | mistat->n_muid = ~0; | |
155 | mistat->extension = mistat->data; | |
156 | } | |
157 | *mistat->data = 0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * v9fs_mistat2unix - convert mistat to unix stat | |
162 | * @mistat: Plan 9 metadata (mistat) structure | |
163 | * @stat: unix metadata (stat) structure to populate | |
164 | * @sb: superblock | |
165 | * | |
166 | */ | |
167 | ||
168 | static void | |
169 | v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf, | |
170 | struct super_block *sb) | |
171 | { | |
172 | struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL; | |
173 | ||
174 | buf->st_nlink = 1; | |
175 | ||
176 | buf->st_atime = mistat->atime; | |
177 | buf->st_mtime = mistat->mtime; | |
178 | buf->st_ctime = mistat->mtime; | |
179 | ||
180 | if (v9ses && v9ses->extended) { | |
181 | /* TODO: string to uid mapping via user-space daemon */ | |
182 | buf->st_uid = mistat->n_uid; | |
183 | buf->st_gid = mistat->n_gid; | |
184 | ||
185 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); | |
186 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); | |
187 | } else { | |
188 | buf->st_uid = v9ses->uid; | |
189 | buf->st_gid = v9ses->gid; | |
190 | } | |
191 | ||
192 | buf->st_uid = (unsigned short)-1; | |
193 | buf->st_gid = (unsigned short)-1; | |
194 | ||
195 | if (v9ses && v9ses->extended) { | |
196 | if (mistat->n_uid != -1) | |
197 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); | |
198 | ||
199 | if (mistat->n_gid != -1) | |
200 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); | |
201 | } | |
202 | ||
203 | if (buf->st_uid == (unsigned short)-1) | |
204 | buf->st_uid = v9ses->uid; | |
205 | if (buf->st_gid == (unsigned short)-1) | |
206 | buf->st_gid = v9ses->gid; | |
207 | ||
208 | buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); | |
209 | if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { | |
210 | char type = 0; | |
211 | int major = -1; | |
212 | int minor = -1; | |
213 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
214 | switch (type) { | |
215 | case 'c': | |
216 | buf->st_mode &= ~S_IFBLK; | |
217 | buf->st_mode |= S_IFCHR; | |
218 | break; | |
219 | case 'b': | |
220 | break; | |
221 | default: | |
222 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
223 | type, mistat->extension); | |
224 | }; | |
225 | buf->st_rdev = MKDEV(major, minor); | |
226 | } else | |
227 | buf->st_rdev = 0; | |
228 | ||
229 | buf->st_size = mistat->length; | |
230 | ||
231 | buf->st_blksize = sb->s_blocksize; | |
232 | buf->st_blocks = | |
233 | (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; | |
234 | } | |
235 | ||
236 | /** | |
237 | * v9fs_get_inode - helper function to setup an inode | |
238 | * @sb: superblock | |
239 | * @mode: mode to setup inode with | |
240 | * | |
241 | */ | |
242 | ||
243 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
244 | { | |
245 | struct inode *inode = NULL; | |
246 | ||
247 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
248 | ||
249 | inode = new_inode(sb); | |
250 | if (inode) { | |
251 | inode->i_mode = mode; | |
252 | inode->i_uid = current->fsuid; | |
253 | inode->i_gid = current->fsgid; | |
254 | inode->i_blksize = sb->s_blocksize; | |
255 | inode->i_blocks = 0; | |
256 | inode->i_rdev = 0; | |
257 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
258 | ||
259 | switch (mode & S_IFMT) { | |
260 | case S_IFIFO: | |
261 | case S_IFBLK: | |
262 | case S_IFCHR: | |
263 | case S_IFSOCK: | |
264 | case S_IFREG: | |
265 | inode->i_op = &v9fs_file_inode_operations; | |
266 | inode->i_fop = &v9fs_file_operations; | |
267 | break; | |
268 | case S_IFDIR: | |
269 | inode->i_nlink++; | |
270 | inode->i_op = &v9fs_dir_inode_operations; | |
271 | inode->i_fop = &v9fs_dir_operations; | |
272 | break; | |
273 | case S_IFLNK: | |
274 | inode->i_op = &v9fs_symlink_inode_operations; | |
275 | break; | |
276 | default: | |
277 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
278 | mode, mode & S_IFMT); | |
279 | return ERR_PTR(-EINVAL); | |
280 | } | |
281 | } else { | |
282 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
283 | return ERR_PTR(-ENOMEM); | |
284 | } | |
285 | return inode; | |
286 | } | |
287 | ||
288 | /** | |
289 | * v9fs_create - helper function to create files and directories | |
290 | * @dir: directory inode file is being created in | |
291 | * @file_dentry: dentry file is being created in | |
292 | * @perm: permissions file is being created with | |
293 | * @open_mode: resulting open mode for file ??? | |
294 | * | |
295 | */ | |
296 | ||
297 | static int | |
298 | v9fs_create(struct inode *dir, | |
299 | struct dentry *file_dentry, | |
300 | unsigned int perm, unsigned int open_mode) | |
301 | { | |
302 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
303 | struct super_block *sb = dir->i_sb; | |
304 | struct v9fs_fid *dirfid = | |
305 | v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); | |
306 | struct v9fs_fid *fid = NULL; | |
307 | struct inode *file_inode = NULL; | |
308 | struct v9fs_fcall *fcall = NULL; | |
309 | struct v9fs_qid qid; | |
310 | struct stat newstat; | |
311 | int dirfidnum = -1; | |
312 | long newfid = -1; | |
313 | int result = 0; | |
314 | unsigned int iounit = 0; | |
315 | ||
316 | perm = unixmode2p9mode(v9ses, perm); | |
317 | ||
318 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, | |
319 | file_dentry, perm, open_mode); | |
320 | ||
321 | if (!dirfid) | |
322 | return -EBADF; | |
323 | ||
324 | dirfidnum = dirfid->fid; | |
325 | if (dirfidnum < 0) { | |
326 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", | |
327 | dir->i_ino); | |
328 | return -EBADF; | |
329 | } | |
330 | ||
331 | if (file_dentry->d_inode) { | |
332 | dprintk(DEBUG_ERROR, | |
333 | "Odd. There is an inode for dir %lu, name :%s:\n", | |
334 | dir->i_ino, file_dentry->d_name.name); | |
335 | return -EEXIST; | |
336 | } | |
337 | ||
338 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
339 | if (newfid < 0) { | |
340 | eprintk(KERN_WARNING, "no free fids available\n"); | |
341 | return -ENOSPC; | |
342 | } | |
343 | ||
344 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); | |
345 | if (result < 0) { | |
346 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
347 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
348 | newfid = 0; | |
349 | goto CleanUpFid; | |
350 | } | |
351 | ||
352 | kfree(fcall); | |
353 | ||
354 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, | |
355 | perm, open_mode, &fcall); | |
356 | if (result < 0) { | |
357 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", | |
358 | FCALL_ERROR(fcall), result); | |
359 | ||
360 | goto CleanUpFid; | |
361 | } | |
362 | ||
363 | iounit = fcall->params.rcreate.iounit; | |
364 | qid = fcall->params.rcreate.qid; | |
365 | kfree(fcall); | |
366 | ||
367 | fid = v9fs_fid_create(file_dentry); | |
368 | if (!fid) { | |
369 | result = -ENOMEM; | |
370 | goto CleanUpFid; | |
371 | } | |
372 | ||
373 | fid->fid = newfid; | |
374 | fid->fidopen = 0; | |
375 | fid->fidcreate = 1; | |
376 | fid->qid = qid; | |
377 | fid->iounit = iounit; | |
378 | fid->rdir_pos = 0; | |
379 | fid->rdir_fcall = NULL; | |
380 | fid->v9ses = v9ses; | |
381 | ||
382 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || | |
383 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || | |
384 | (perm & V9FS_DMDEVICE)) | |
385 | return 0; | |
386 | ||
387 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
388 | if (result < 0) { | |
389 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), | |
390 | result); | |
391 | goto CleanUpFid; | |
392 | } | |
393 | ||
394 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
395 | ||
396 | file_inode = v9fs_get_inode(sb, newstat.st_mode); | |
397 | if ((!file_inode) || IS_ERR(file_inode)) { | |
398 | dprintk(DEBUG_ERROR, "create inode failed\n"); | |
399 | result = -EBADF; | |
400 | goto CleanUpFid; | |
401 | } | |
402 | ||
403 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); | |
404 | kfree(fcall); | |
405 | d_instantiate(file_dentry, file_inode); | |
406 | ||
407 | if (perm & V9FS_DMDIR) { | |
408 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
409 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", | |
410 | FCALL_ERROR(fcall)); | |
411 | ||
412 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
413 | kfree(fcall); | |
414 | fid->fidopen = 0; | |
415 | fid->fidcreate = 0; | |
416 | d_drop(file_dentry); | |
417 | } | |
418 | ||
419 | return 0; | |
420 | ||
421 | CleanUpFid: | |
422 | kfree(fcall); | |
423 | ||
424 | if (newfid) { | |
425 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
426 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", | |
427 | FCALL_ERROR(fcall)); | |
428 | ||
429 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
430 | kfree(fcall); | |
431 | } | |
432 | return result; | |
433 | } | |
434 | ||
435 | /** | |
436 | * v9fs_remove - helper function to remove files and directories | |
437 | * @inode: directory inode that is being deleted | |
438 | * @dentry: dentry that is being deleted | |
439 | * @rmdir: where we are a file or a directory | |
440 | * | |
441 | */ | |
442 | ||
443 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
444 | { | |
445 | struct v9fs_fcall *fcall = NULL; | |
446 | struct super_block *sb = NULL; | |
447 | struct v9fs_session_info *v9ses = NULL; | |
448 | struct v9fs_fid *v9fid = NULL; | |
449 | struct inode *file_inode = NULL; | |
450 | int fid = -1; | |
451 | int result = 0; | |
452 | ||
453 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
454 | rmdir); | |
455 | ||
456 | file_inode = file->d_inode; | |
457 | sb = file_inode->i_sb; | |
458 | v9ses = v9fs_inode2v9ses(file_inode); | |
459 | v9fid = v9fs_fid_lookup(file, FID_OP); | |
460 | ||
461 | if (!v9fid) { | |
462 | dprintk(DEBUG_ERROR, | |
463 | "no v9fs_fid\n"); | |
464 | return -EBADF; | |
465 | } | |
466 | ||
467 | fid = v9fid->fid; | |
468 | if (fid < 0) { | |
469 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
470 | file_inode->i_ino); | |
471 | return -EBADF; | |
472 | } | |
473 | ||
474 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
475 | if (result < 0) | |
476 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", | |
477 | FCALL_ERROR(fcall), result); | |
478 | else { | |
479 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
480 | v9fs_fid_destroy(v9fid); | |
481 | } | |
482 | ||
483 | kfree(fcall); | |
484 | return result; | |
485 | } | |
486 | ||
487 | /** | |
488 | * v9fs_vfs_create - VFS hook to create files | |
489 | * @inode: directory inode that is being deleted | |
490 | * @dentry: dentry that is being deleted | |
491 | * @perm: create permissions | |
492 | * @nd: path information | |
493 | * | |
494 | */ | |
495 | ||
496 | static int | |
497 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, | |
498 | struct nameidata *nd) | |
499 | { | |
500 | return v9fs_create(inode, dentry, perm, O_RDWR); | |
501 | } | |
502 | ||
503 | /** | |
504 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
505 | * @i: inode that is being unlinked | |
506 | * @dentry: dentry that is being unlinked | |
507 | * @mode: mode for new directory | |
508 | * | |
509 | */ | |
510 | ||
511 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) | |
512 | { | |
513 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); | |
514 | } | |
515 | ||
516 | /** | |
517 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
518 | * @dir: inode that is being walked from | |
519 | * @dentry: dentry that is being walked to? | |
520 | * @nameidata: path data | |
521 | * | |
522 | */ | |
523 | ||
524 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
525 | struct nameidata *nameidata) | |
526 | { | |
527 | struct super_block *sb; | |
528 | struct v9fs_session_info *v9ses; | |
529 | struct v9fs_fid *dirfid; | |
530 | struct v9fs_fid *fid; | |
531 | struct inode *inode; | |
532 | struct v9fs_fcall *fcall = NULL; | |
533 | struct stat newstat; | |
534 | int dirfidnum = -1; | |
535 | int newfid = -1; | |
536 | int result = 0; | |
537 | ||
538 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
539 | dir, dentry->d_iname, dentry, nameidata); | |
540 | ||
541 | sb = dir->i_sb; | |
542 | v9ses = v9fs_inode2v9ses(dir); | |
543 | dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); | |
544 | ||
545 | if (!dirfid) { | |
546 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
547 | return ERR_PTR(-EINVAL); | |
548 | } | |
549 | ||
550 | dirfidnum = dirfid->fid; | |
551 | ||
552 | if (dirfidnum < 0) { | |
553 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
554 | dir, dir->i_ino); | |
555 | return ERR_PTR(-EBADF); | |
556 | } | |
557 | ||
558 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
559 | if (newfid < 0) { | |
560 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
561 | return ERR_PTR(-ENOSPC); | |
562 | } | |
563 | ||
564 | result = | |
565 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, | |
566 | NULL); | |
567 | if (result < 0) { | |
568 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
569 | if (result == -ENOENT) { | |
570 | d_add(dentry, NULL); | |
571 | dprintk(DEBUG_ERROR, | |
572 | "Return negative dentry %p count %d\n", | |
573 | dentry, atomic_read(&dentry->d_count)); | |
574 | return NULL; | |
575 | } | |
576 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
577 | goto FreeFcall; | |
578 | } | |
579 | ||
580 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
581 | if (result < 0) { | |
582 | dprintk(DEBUG_ERROR, "stat error\n"); | |
583 | goto FreeFcall; | |
584 | } | |
585 | ||
586 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
587 | inode = v9fs_get_inode(sb, newstat.st_mode); | |
588 | ||
589 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
590 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
591 | PTR_ERR(inode)); | |
592 | ||
593 | result = -ENOSPC; | |
594 | goto FreeFcall; | |
595 | } | |
596 | ||
597 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
598 | ||
599 | fid = v9fs_fid_create(dentry); | |
600 | if (fid == NULL) { | |
601 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
602 | result = -ENOMEM; | |
603 | goto FreeFcall; | |
604 | } | |
605 | ||
606 | fid->fid = newfid; | |
607 | fid->fidopen = 0; | |
608 | fid->v9ses = v9ses; | |
609 | fid->qid = fcall->params.rstat.stat->qid; | |
610 | ||
611 | dentry->d_op = &v9fs_dentry_operations; | |
612 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); | |
613 | ||
614 | d_add(dentry, inode); | |
615 | kfree(fcall); | |
616 | ||
617 | return NULL; | |
618 | ||
619 | FreeFcall: | |
620 | kfree(fcall); | |
621 | return ERR_PTR(result); | |
622 | } | |
623 | ||
624 | /** | |
625 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
626 | * @i: inode that is being unlinked | |
627 | * @dentry: dentry that is being unlinked | |
628 | * | |
629 | */ | |
630 | ||
631 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
632 | { | |
633 | return v9fs_remove(i, d, 0); | |
634 | } | |
635 | ||
636 | /** | |
637 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
638 | * @i: inode that is being unlinked | |
639 | * @dentry: dentry that is being unlinked | |
640 | * | |
641 | */ | |
642 | ||
643 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
644 | { | |
645 | return v9fs_remove(i, d, 1); | |
646 | } | |
647 | ||
648 | /** | |
649 | * v9fs_vfs_rename - VFS hook to rename an inode | |
650 | * @old_dir: old dir inode | |
651 | * @old_dentry: old dentry | |
652 | * @new_dir: new dir inode | |
653 | * @new_dentry: new dentry | |
654 | * | |
655 | */ | |
656 | ||
657 | static int | |
658 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
659 | struct inode *new_dir, struct dentry *new_dentry) | |
660 | { | |
661 | struct inode *old_inode = old_dentry->d_inode; | |
662 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
663 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK); | |
664 | struct v9fs_fid *olddirfid = | |
665 | v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); | |
666 | struct v9fs_fid *newdirfid = | |
667 | v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); | |
668 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
669 | struct v9fs_fcall *fcall = NULL; | |
670 | int fid = -1; | |
671 | int olddirfidnum = -1; | |
672 | int newdirfidnum = -1; | |
673 | int retval = 0; | |
674 | ||
675 | dprintk(DEBUG_VFS, "\n"); | |
676 | ||
677 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { | |
678 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
679 | return -EBADF; | |
680 | } | |
681 | ||
682 | /* 9P can only handle file rename in the same directory */ | |
683 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
684 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
685 | retval = -EPERM; | |
686 | goto FreeFcallnBail; | |
687 | } | |
688 | ||
689 | fid = oldfid->fid; | |
690 | olddirfidnum = olddirfid->fid; | |
691 | newdirfidnum = newdirfid->fid; | |
692 | ||
693 | if (fid < 0) { | |
694 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
695 | old_inode->i_ino); | |
696 | retval = -EBADF; | |
697 | goto FreeFcallnBail; | |
698 | } | |
699 | ||
700 | v9fs_blank_mistat(v9ses, mistat); | |
701 | ||
702 | strcpy(mistat->data + 1, v9ses->name); | |
703 | mistat->name = mistat->data + 1 + strlen(v9ses->name); | |
704 | ||
705 | if (new_dentry->d_name.len > | |
706 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { | |
707 | dprintk(DEBUG_ERROR, "new name too long\n"); | |
708 | goto FreeFcallnBail; | |
709 | } | |
710 | ||
711 | strcpy(mistat->name, new_dentry->d_name.name); | |
712 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); | |
713 | ||
714 | FreeFcallnBail: | |
715 | kfree(mistat); | |
716 | ||
717 | if (retval < 0) | |
718 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
719 | FCALL_ERROR(fcall)); | |
720 | ||
721 | kfree(fcall); | |
722 | return retval; | |
723 | } | |
724 | ||
725 | /** | |
726 | * v9fs_vfs_getattr - retreive file metadata | |
727 | * @mnt - mount information | |
728 | * @dentry - file to get attributes on | |
729 | * @stat - metadata structure to populate | |
730 | * | |
731 | */ | |
732 | ||
733 | static int | |
734 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
735 | struct kstat *stat) | |
736 | { | |
737 | struct v9fs_fcall *fcall = NULL; | |
738 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
739 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
740 | int err = -EPERM; | |
741 | ||
742 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
743 | if (!fid) { | |
744 | dprintk(DEBUG_ERROR, | |
745 | "couldn't find fid associated with dentry\n"); | |
746 | return -EBADF; | |
747 | } | |
748 | ||
749 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
750 | ||
751 | if (err < 0) | |
752 | dprintk(DEBUG_ERROR, "stat error\n"); | |
753 | else { | |
754 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, | |
755 | dentry->d_inode->i_sb); | |
756 | generic_fillattr(dentry->d_inode, stat); | |
757 | } | |
758 | ||
759 | kfree(fcall); | |
760 | return err; | |
761 | } | |
762 | ||
763 | /** | |
764 | * v9fs_vfs_setattr - set file metadata | |
765 | * @dentry: file whose metadata to set | |
766 | * @iattr: metadata assignment structure | |
767 | * | |
768 | */ | |
769 | ||
770 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
771 | { | |
772 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
773 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
774 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
775 | struct v9fs_fcall *fcall = NULL; | |
776 | int res = -EPERM; | |
777 | ||
778 | dprintk(DEBUG_VFS, "\n"); | |
779 | if (!fid) { | |
780 | dprintk(DEBUG_ERROR, | |
781 | "Couldn't find fid associated with dentry\n"); | |
782 | return -EBADF; | |
783 | } | |
784 | ||
785 | if (!mistat) | |
786 | return -ENOMEM; | |
787 | ||
788 | v9fs_blank_mistat(v9ses, mistat); | |
789 | if (iattr->ia_valid & ATTR_MODE) | |
790 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); | |
791 | ||
792 | if (iattr->ia_valid & ATTR_MTIME) | |
793 | mistat->mtime = iattr->ia_mtime.tv_sec; | |
794 | ||
795 | if (iattr->ia_valid & ATTR_ATIME) | |
796 | mistat->atime = iattr->ia_atime.tv_sec; | |
797 | ||
798 | if (iattr->ia_valid & ATTR_SIZE) | |
799 | mistat->length = iattr->ia_size; | |
800 | ||
801 | if (v9ses->extended) { | |
802 | char *uid = kmalloc(strlen(mistat->uid), GFP_KERNEL); | |
803 | char *gid = kmalloc(strlen(mistat->gid), GFP_KERNEL); | |
804 | char *muid = kmalloc(strlen(mistat->muid), GFP_KERNEL); | |
805 | char *name = kmalloc(strlen(mistat->name), GFP_KERNEL); | |
806 | char *extension = kmalloc(strlen(mistat->extension), | |
807 | GFP_KERNEL); | |
808 | ||
809 | if ((!uid) || (!gid) || (!muid) || (!name) || (!extension)) { | |
810 | kfree(uid); | |
811 | kfree(gid); | |
812 | kfree(muid); | |
813 | kfree(name); | |
814 | kfree(extension); | |
815 | ||
816 | return -ENOMEM; | |
817 | } | |
818 | ||
819 | strcpy(uid, mistat->uid); | |
820 | strcpy(gid, mistat->gid); | |
821 | strcpy(muid, mistat->muid); | |
822 | strcpy(name, mistat->name); | |
823 | strcpy(extension, mistat->extension); | |
824 | ||
825 | if (iattr->ia_valid & ATTR_UID) { | |
826 | if (strlen(uid) != 8) { | |
827 | dprintk(DEBUG_ERROR, "uid strlen is %u not 8\n", | |
828 | (unsigned int)strlen(uid)); | |
829 | sprintf(uid, "%08x", iattr->ia_uid); | |
830 | } else { | |
831 | kfree(uid); | |
832 | uid = kmalloc(9, GFP_KERNEL); | |
833 | } | |
834 | ||
835 | sprintf(uid, "%08x", iattr->ia_uid); | |
836 | mistat->n_uid = iattr->ia_uid; | |
837 | } | |
838 | ||
839 | if (iattr->ia_valid & ATTR_GID) { | |
840 | if (strlen(gid) != 8) | |
841 | dprintk(DEBUG_ERROR, "gid strlen is %u not 8\n", | |
842 | (unsigned int)strlen(gid)); | |
843 | else { | |
844 | kfree(gid); | |
845 | gid = kmalloc(9, GFP_KERNEL); | |
846 | } | |
847 | ||
848 | sprintf(gid, "%08x", iattr->ia_gid); | |
849 | mistat->n_gid = iattr->ia_gid; | |
850 | } | |
851 | ||
852 | mistat->uid = mistat->data; | |
853 | strcpy(mistat->uid, uid); | |
854 | mistat->gid = mistat->data + strlen(uid) + 1; | |
855 | strcpy(mistat->gid, gid); | |
856 | mistat->muid = mistat->gid + strlen(gid) + 1; | |
857 | strcpy(mistat->muid, muid); | |
858 | mistat->name = mistat->muid + strlen(muid) + 1; | |
859 | strcpy(mistat->name, name); | |
860 | mistat->extension = mistat->name + strlen(name) + 1; | |
861 | strcpy(mistat->extension, extension); | |
862 | ||
863 | kfree(uid); | |
864 | kfree(gid); | |
865 | kfree(muid); | |
866 | kfree(name); | |
867 | kfree(extension); | |
868 | } | |
869 | ||
870 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); | |
871 | ||
872 | if (res < 0) | |
873 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); | |
874 | ||
875 | kfree(mistat); | |
876 | kfree(fcall); | |
877 | ||
878 | if (res >= 0) | |
879 | res = inode_setattr(dentry->d_inode, iattr); | |
880 | ||
881 | return res; | |
882 | } | |
883 | ||
884 | /** | |
885 | * v9fs_mistat2inode - populate an inode structure with mistat info | |
886 | * @mistat: Plan 9 metadata (mistat) structure | |
887 | * @inode: inode to populate | |
888 | * @sb: superblock of filesystem | |
889 | * | |
890 | */ | |
891 | ||
892 | void | |
893 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, | |
894 | struct super_block *sb) | |
895 | { | |
896 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
897 | ||
898 | inode->i_nlink = 1; | |
899 | ||
900 | inode->i_atime.tv_sec = mistat->atime; | |
901 | inode->i_mtime.tv_sec = mistat->mtime; | |
902 | inode->i_ctime.tv_sec = mistat->mtime; | |
903 | ||
904 | inode->i_uid = -1; | |
905 | inode->i_gid = -1; | |
906 | ||
907 | if (v9ses->extended) { | |
908 | /* TODO: string to uid mapping via user-space daemon */ | |
909 | inode->i_uid = mistat->n_uid; | |
910 | inode->i_gid = mistat->n_gid; | |
911 | ||
912 | if (mistat->n_uid == -1) | |
913 | sscanf(mistat->uid, "%x", &inode->i_uid); | |
914 | ||
915 | if (mistat->n_gid == -1) | |
916 | sscanf(mistat->gid, "%x", &inode->i_gid); | |
917 | } | |
918 | ||
919 | if (inode->i_uid == -1) | |
920 | inode->i_uid = v9ses->uid; | |
921 | if (inode->i_gid == -1) | |
922 | inode->i_gid = v9ses->gid; | |
923 | ||
924 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); | |
925 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { | |
926 | char type = 0; | |
927 | int major = -1; | |
928 | int minor = -1; | |
929 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
930 | switch (type) { | |
931 | case 'c': | |
932 | inode->i_mode &= ~S_IFBLK; | |
933 | inode->i_mode |= S_IFCHR; | |
934 | break; | |
935 | case 'b': | |
936 | break; | |
937 | default: | |
938 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
939 | type, mistat->extension); | |
940 | }; | |
941 | inode->i_rdev = MKDEV(major, minor); | |
942 | } else | |
943 | inode->i_rdev = 0; | |
944 | ||
945 | inode->i_size = mistat->length; | |
946 | ||
947 | inode->i_blksize = sb->s_blocksize; | |
948 | inode->i_blocks = | |
949 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
950 | } | |
951 | ||
952 | /** | |
953 | * v9fs_qid2ino - convert qid into inode number | |
954 | * @qid: qid to hash | |
955 | * | |
956 | * BUG: potential for inode number collisions? | |
957 | */ | |
958 | ||
959 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
960 | { | |
961 | u64 path = qid->path + 2; | |
962 | ino_t i = 0; | |
963 | ||
964 | if (sizeof(ino_t) == sizeof(path)) | |
965 | memcpy(&i, &path, sizeof(ino_t)); | |
966 | else | |
967 | i = (ino_t) (path ^ (path >> 32)); | |
968 | ||
969 | return i; | |
970 | } | |
971 | ||
972 | /** | |
973 | * v9fs_vfs_symlink - helper function to create symlinks | |
974 | * @dir: directory inode containing symlink | |
975 | * @dentry: dentry for symlink | |
976 | * @symname: symlink data | |
977 | * | |
978 | * See 9P2000.u RFC for more information | |
979 | * | |
980 | */ | |
981 | ||
982 | static int | |
983 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
984 | { | |
985 | int retval = -EPERM; | |
986 | struct v9fs_fid *newfid; | |
987 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
988 | struct super_block *sb = dir ? dir->i_sb : NULL; | |
989 | struct v9fs_fcall *fcall = NULL; | |
990 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
991 | ||
992 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
993 | symname); | |
994 | ||
995 | if ((!dentry) || (!sb) || (!v9ses)) { | |
996 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
997 | return -EBADF; | |
998 | } | |
999 | ||
1000 | if (!v9ses->extended) { | |
1001 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1002 | goto FreeFcall; | |
1003 | } | |
1004 | ||
1005 | /* issue a create */ | |
1006 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); | |
1007 | if (retval != 0) | |
1008 | goto FreeFcall; | |
1009 | ||
1010 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1011 | ||
1012 | /* issue a twstat */ | |
1013 | v9fs_blank_mistat(v9ses, mistat); | |
1014 | strcpy(mistat->data + 1, symname); | |
1015 | mistat->extension = mistat->data + 1; | |
1016 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1017 | if (retval < 0) { | |
1018 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1019 | FCALL_ERROR(fcall)); | |
1020 | goto FreeFcall; | |
1021 | } | |
1022 | ||
1023 | kfree(fcall); | |
1024 | ||
1025 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1026 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1027 | FCALL_ERROR(fcall)); | |
1028 | goto FreeFcall; | |
1029 | } | |
1030 | ||
1031 | d_drop(dentry); /* FID - will this also clunk? */ | |
1032 | ||
1033 | FreeFcall: | |
1034 | kfree(mistat); | |
1035 | kfree(fcall); | |
1036 | ||
1037 | return retval; | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * v9fs_readlink - read a symlink's location (internal version) | |
1042 | * @dentry: dentry for symlink | |
1043 | * @buf: buffer to load symlink location into | |
1044 | * @buflen: length of buffer | |
1045 | * | |
1046 | */ | |
1047 | ||
1048 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1049 | { | |
1050 | int retval = -EPERM; | |
1051 | ||
1052 | struct v9fs_fcall *fcall = NULL; | |
1053 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1054 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
1055 | ||
1056 | if (!fid) { | |
1057 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
1058 | retval = -EBADF; | |
1059 | goto FreeFcall; | |
1060 | } | |
1061 | ||
1062 | if (!v9ses->extended) { | |
1063 | retval = -EBADF; | |
1064 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1065 | goto FreeFcall; | |
1066 | } | |
1067 | ||
1068 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1069 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1070 | ||
1071 | if (retval < 0) { | |
1072 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1073 | goto FreeFcall; | |
1074 | } | |
1075 | ||
1076 | if (!fcall) | |
1077 | return -EIO; | |
1078 | ||
1079 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { | |
1080 | retval = -EINVAL; | |
1081 | goto FreeFcall; | |
1082 | } | |
1083 | ||
1084 | /* copy extension buffer into buffer */ | |
1085 | if (strlen(fcall->params.rstat.stat->extension) < buflen) | |
1086 | buflen = strlen(fcall->params.rstat.stat->extension); | |
1087 | ||
1088 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); | |
1089 | ||
1090 | retval = buflen; | |
1091 | ||
1092 | FreeFcall: | |
1093 | kfree(fcall); | |
1094 | ||
1095 | return retval; | |
1096 | } | |
1097 | ||
1098 | /** | |
1099 | * v9fs_vfs_readlink - read a symlink's location | |
1100 | * @dentry: dentry for symlink | |
1101 | * @buf: buffer to load symlink location into | |
1102 | * @buflen: length of buffer | |
1103 | * | |
1104 | */ | |
1105 | ||
1106 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1107 | int buflen) | |
1108 | { | |
1109 | int retval; | |
1110 | int ret; | |
1111 | char *link = __getname(); | |
1112 | ||
1113 | if (strlen(link) < buflen) | |
1114 | buflen = strlen(link); | |
1115 | ||
1116 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1117 | ||
1118 | retval = v9fs_readlink(dentry, link, buflen); | |
1119 | ||
1120 | if (retval > 0) { | |
1121 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1122 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1123 | ret); | |
1124 | retval = ret; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | putname(link); | |
1129 | return retval; | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * v9fs_vfs_follow_link - follow a symlink path | |
1134 | * @dentry: dentry for symlink | |
1135 | * @nd: nameidata | |
1136 | * | |
1137 | */ | |
1138 | ||
1139 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1140 | { | |
1141 | int len = 0; | |
1142 | char *link = __getname(); | |
1143 | ||
1144 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1145 | ||
1146 | if (!link) | |
1147 | link = ERR_PTR(-ENOMEM); | |
1148 | else { | |
1149 | len = v9fs_readlink(dentry, link, strlen(link)); | |
1150 | ||
1151 | if (len < 0) { | |
1152 | putname(link); | |
1153 | link = ERR_PTR(len); | |
1154 | } else | |
1155 | link[len] = 0; | |
1156 | } | |
1157 | nd_set_link(nd, link); | |
1158 | ||
1159 | return NULL; | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * v9fs_vfs_put_link - release a symlink path | |
1164 | * @dentry: dentry for symlink | |
1165 | * @nd: nameidata | |
1166 | * | |
1167 | */ | |
1168 | ||
1169 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1170 | { | |
1171 | char *s = nd_get_link(nd); | |
1172 | ||
1173 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1174 | if (!IS_ERR(s)) | |
1175 | putname(s); | |
1176 | } | |
1177 | ||
1178 | /** | |
1179 | * v9fs_vfs_link - create a hardlink | |
1180 | * @old_dentry: dentry for file to link to | |
1181 | * @dir: inode destination for new link | |
1182 | * @new_dentry: dentry for link | |
1183 | * | |
1184 | */ | |
1185 | ||
1186 | /* XXX - lots of code dup'd from symlink and creates, | |
1187 | * figure out a better reuse strategy | |
1188 | */ | |
1189 | ||
1190 | static int | |
1191 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1192 | struct dentry *dentry) | |
1193 | { | |
1194 | int retval = -EPERM; | |
1195 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1196 | struct v9fs_fcall *fcall = NULL; | |
1197 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1198 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); | |
1199 | struct v9fs_fid *newfid = NULL; | |
1200 | char *symname = __getname(); | |
1201 | ||
1202 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1203 | old_dentry->d_name.name); | |
1204 | ||
1205 | if (!v9ses->extended) { | |
1206 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1207 | goto FreeMem; | |
1208 | } | |
1209 | ||
1210 | /* get fid of old_dentry */ | |
1211 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); | |
1212 | ||
1213 | /* issue a create */ | |
1214 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); | |
1215 | if (retval != 0) | |
1216 | goto FreeMem; | |
1217 | ||
1218 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1219 | if (!newfid) { | |
1220 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); | |
1221 | goto FreeMem; | |
1222 | } | |
1223 | ||
1224 | /* issue a twstat */ | |
1225 | v9fs_blank_mistat(v9ses, mistat); | |
1226 | strcpy(mistat->data + 1, symname); | |
1227 | mistat->extension = mistat->data + 1; | |
1228 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1229 | if (retval < 0) { | |
1230 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1231 | FCALL_ERROR(fcall)); | |
1232 | goto FreeMem; | |
1233 | } | |
1234 | ||
1235 | kfree(fcall); | |
1236 | ||
1237 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1238 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1239 | FCALL_ERROR(fcall)); | |
1240 | goto FreeMem; | |
1241 | } | |
1242 | ||
1243 | d_drop(dentry); /* FID - will this also clunk? */ | |
1244 | ||
1245 | kfree(fcall); | |
1246 | fcall = NULL; | |
1247 | ||
1248 | FreeMem: | |
1249 | kfree(mistat); | |
1250 | kfree(fcall); | |
1251 | putname(symname); | |
1252 | return retval; | |
1253 | } | |
1254 | ||
1255 | /** | |
1256 | * v9fs_vfs_mknod - create a special file | |
1257 | * @dir: inode destination for new link | |
1258 | * @dentry: dentry for file | |
1259 | * @mode: mode for creation | |
1260 | * @dev_t: device associated with special file | |
1261 | * | |
1262 | */ | |
1263 | ||
1264 | static int | |
1265 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1266 | { | |
1267 | int retval = -EPERM; | |
1268 | struct v9fs_fid *newfid; | |
1269 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1270 | struct v9fs_fcall *fcall = NULL; | |
1271 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1272 | char *symname = __getname(); | |
1273 | ||
1274 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1275 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1276 | ||
1277 | if (!new_valid_dev(rdev)) { | |
1278 | retval = -EINVAL; | |
1279 | goto FreeMem; | |
1280 | } | |
1281 | ||
1282 | if (!v9ses->extended) { | |
1283 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1284 | goto FreeMem; | |
1285 | } | |
1286 | ||
1287 | /* issue a create */ | |
1288 | retval = v9fs_create(dir, dentry, mode, 0); | |
1289 | ||
1290 | if (retval != 0) | |
1291 | goto FreeMem; | |
1292 | ||
1293 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1294 | if (!newfid) { | |
1295 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); | |
1296 | retval = -EINVAL; | |
1297 | goto FreeMem; | |
1298 | } | |
1299 | ||
1300 | /* build extension */ | |
1301 | if (S_ISBLK(mode)) | |
1302 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); | |
1303 | else if (S_ISCHR(mode)) | |
1304 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); | |
1305 | else if (S_ISFIFO(mode)) ; /* DO NOTHING */ | |
1306 | else { | |
1307 | retval = -EINVAL; | |
1308 | goto FreeMem; | |
1309 | } | |
1310 | ||
1311 | if (!S_ISFIFO(mode)) { | |
1312 | /* issue a twstat */ | |
1313 | v9fs_blank_mistat(v9ses, mistat); | |
1314 | strcpy(mistat->data + 1, symname); | |
1315 | mistat->extension = mistat->data + 1; | |
1316 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1317 | if (retval < 0) { | |
1318 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1319 | FCALL_ERROR(fcall)); | |
1320 | goto FreeMem; | |
1321 | } | |
1322 | ||
1323 | kfree(fcall); | |
1324 | } | |
1325 | ||
1326 | /* need to update dcache so we show up */ | |
1327 | kfree(fcall); | |
1328 | ||
1329 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1330 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1331 | FCALL_ERROR(fcall)); | |
1332 | goto FreeMem; | |
1333 | } | |
1334 | ||
1335 | d_drop(dentry); /* FID - will this also clunk? */ | |
1336 | ||
1337 | FreeMem: | |
1338 | kfree(mistat); | |
1339 | kfree(fcall); | |
1340 | putname(symname); | |
1341 | ||
1342 | return retval; | |
1343 | } | |
1344 | ||
1345 | static struct inode_operations v9fs_dir_inode_operations = { | |
1346 | .create = v9fs_vfs_create, | |
1347 | .lookup = v9fs_vfs_lookup, | |
1348 | .symlink = v9fs_vfs_symlink, | |
1349 | .link = v9fs_vfs_link, | |
1350 | .unlink = v9fs_vfs_unlink, | |
1351 | .mkdir = v9fs_vfs_mkdir, | |
1352 | .rmdir = v9fs_vfs_rmdir, | |
1353 | .mknod = v9fs_vfs_mknod, | |
1354 | .rename = v9fs_vfs_rename, | |
1355 | .readlink = v9fs_vfs_readlink, | |
1356 | .getattr = v9fs_vfs_getattr, | |
1357 | .setattr = v9fs_vfs_setattr, | |
1358 | }; | |
1359 | ||
1360 | static struct inode_operations v9fs_file_inode_operations = { | |
1361 | .getattr = v9fs_vfs_getattr, | |
1362 | .setattr = v9fs_vfs_setattr, | |
1363 | }; | |
1364 | ||
1365 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1366 | .readlink = v9fs_vfs_readlink, | |
1367 | .follow_link = v9fs_vfs_follow_link, | |
1368 | .put_link = v9fs_vfs_put_link, | |
1369 | .getattr = v9fs_vfs_getattr, | |
1370 | .setattr = v9fs_vfs_setattr, | |
1371 | }; |