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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; | |
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 | ||
73c592b9 | 57 | static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
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 | ||
73c592b9 | 95 | static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
2bad8471 EVH |
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 | ||
73c592b9 | 135 | static void |
2bad8471 EVH |
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 | |
73c592b9 | 163 | * @buf: unix metadata (stat) structure to populate |
2bad8471 EVH |
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 | ||
2bad8471 EVH |
180 | buf->st_uid = (unsigned short)-1; |
181 | buf->st_gid = (unsigned short)-1; | |
182 | ||
183 | if (v9ses && v9ses->extended) { | |
73c592b9 | 184 | /* TODO: string to uid mapping via user-space daemon */ |
2bad8471 EVH |
185 | if (mistat->n_uid != -1) |
186 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); | |
187 | ||
188 | if (mistat->n_gid != -1) | |
189 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); | |
190 | } | |
191 | ||
192 | if (buf->st_uid == (unsigned short)-1) | |
193 | buf->st_uid = v9ses->uid; | |
194 | if (buf->st_gid == (unsigned short)-1) | |
195 | buf->st_gid = v9ses->gid; | |
196 | ||
197 | buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); | |
198 | if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { | |
199 | char type = 0; | |
200 | int major = -1; | |
201 | int minor = -1; | |
202 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
203 | switch (type) { | |
204 | case 'c': | |
205 | buf->st_mode &= ~S_IFBLK; | |
206 | buf->st_mode |= S_IFCHR; | |
207 | break; | |
208 | case 'b': | |
209 | break; | |
210 | default: | |
211 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
212 | type, mistat->extension); | |
213 | }; | |
214 | buf->st_rdev = MKDEV(major, minor); | |
215 | } else | |
216 | buf->st_rdev = 0; | |
217 | ||
218 | buf->st_size = mistat->length; | |
219 | ||
220 | buf->st_blksize = sb->s_blocksize; | |
221 | buf->st_blocks = | |
222 | (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; | |
223 | } | |
224 | ||
225 | /** | |
226 | * v9fs_get_inode - helper function to setup an inode | |
227 | * @sb: superblock | |
228 | * @mode: mode to setup inode with | |
229 | * | |
230 | */ | |
231 | ||
232 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) | |
233 | { | |
234 | struct inode *inode = NULL; | |
235 | ||
236 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); | |
237 | ||
238 | inode = new_inode(sb); | |
239 | if (inode) { | |
240 | inode->i_mode = mode; | |
241 | inode->i_uid = current->fsuid; | |
242 | inode->i_gid = current->fsgid; | |
243 | inode->i_blksize = sb->s_blocksize; | |
244 | inode->i_blocks = 0; | |
245 | inode->i_rdev = 0; | |
246 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
247 | ||
248 | switch (mode & S_IFMT) { | |
249 | case S_IFIFO: | |
250 | case S_IFBLK: | |
251 | case S_IFCHR: | |
252 | case S_IFSOCK: | |
253 | case S_IFREG: | |
254 | inode->i_op = &v9fs_file_inode_operations; | |
255 | inode->i_fop = &v9fs_file_operations; | |
256 | break; | |
257 | case S_IFDIR: | |
258 | inode->i_nlink++; | |
259 | inode->i_op = &v9fs_dir_inode_operations; | |
260 | inode->i_fop = &v9fs_dir_operations; | |
261 | break; | |
262 | case S_IFLNK: | |
263 | inode->i_op = &v9fs_symlink_inode_operations; | |
264 | break; | |
265 | default: | |
266 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", | |
267 | mode, mode & S_IFMT); | |
268 | return ERR_PTR(-EINVAL); | |
269 | } | |
270 | } else { | |
271 | eprintk(KERN_WARNING, "Problem allocating inode\n"); | |
272 | return ERR_PTR(-ENOMEM); | |
273 | } | |
274 | return inode; | |
275 | } | |
276 | ||
277 | /** | |
278 | * v9fs_create - helper function to create files and directories | |
279 | * @dir: directory inode file is being created in | |
280 | * @file_dentry: dentry file is being created in | |
281 | * @perm: permissions file is being created with | |
73c592b9 | 282 | * @open_mode: resulting open mode for file |
2bad8471 EVH |
283 | * |
284 | */ | |
285 | ||
286 | static int | |
287 | v9fs_create(struct inode *dir, | |
288 | struct dentry *file_dentry, | |
289 | unsigned int perm, unsigned int open_mode) | |
290 | { | |
291 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
292 | struct super_block *sb = dir->i_sb; | |
293 | struct v9fs_fid *dirfid = | |
294 | v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); | |
295 | struct v9fs_fid *fid = NULL; | |
296 | struct inode *file_inode = NULL; | |
297 | struct v9fs_fcall *fcall = NULL; | |
298 | struct v9fs_qid qid; | |
299 | struct stat newstat; | |
300 | int dirfidnum = -1; | |
301 | long newfid = -1; | |
302 | int result = 0; | |
303 | unsigned int iounit = 0; | |
304 | ||
305 | perm = unixmode2p9mode(v9ses, perm); | |
306 | ||
307 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, | |
308 | file_dentry, perm, open_mode); | |
309 | ||
310 | if (!dirfid) | |
311 | return -EBADF; | |
312 | ||
313 | dirfidnum = dirfid->fid; | |
314 | if (dirfidnum < 0) { | |
315 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", | |
316 | dir->i_ino); | |
317 | return -EBADF; | |
318 | } | |
319 | ||
320 | if (file_dentry->d_inode) { | |
321 | dprintk(DEBUG_ERROR, | |
322 | "Odd. There is an inode for dir %lu, name :%s:\n", | |
323 | dir->i_ino, file_dentry->d_name.name); | |
324 | return -EEXIST; | |
325 | } | |
326 | ||
327 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
328 | if (newfid < 0) { | |
329 | eprintk(KERN_WARNING, "no free fids available\n"); | |
330 | return -ENOSPC; | |
331 | } | |
332 | ||
333 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); | |
334 | if (result < 0) { | |
335 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
336 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
337 | newfid = 0; | |
338 | goto CleanUpFid; | |
339 | } | |
340 | ||
341 | kfree(fcall); | |
342 | ||
343 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, | |
344 | perm, open_mode, &fcall); | |
345 | if (result < 0) { | |
346 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", | |
347 | FCALL_ERROR(fcall), result); | |
348 | ||
349 | goto CleanUpFid; | |
350 | } | |
351 | ||
352 | iounit = fcall->params.rcreate.iounit; | |
353 | qid = fcall->params.rcreate.qid; | |
354 | kfree(fcall); | |
355 | ||
356 | fid = v9fs_fid_create(file_dentry); | |
357 | if (!fid) { | |
358 | result = -ENOMEM; | |
359 | goto CleanUpFid; | |
360 | } | |
361 | ||
362 | fid->fid = newfid; | |
363 | fid->fidopen = 0; | |
364 | fid->fidcreate = 1; | |
365 | fid->qid = qid; | |
366 | fid->iounit = iounit; | |
367 | fid->rdir_pos = 0; | |
368 | fid->rdir_fcall = NULL; | |
369 | fid->v9ses = v9ses; | |
370 | ||
371 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || | |
372 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || | |
373 | (perm & V9FS_DMDEVICE)) | |
374 | return 0; | |
375 | ||
376 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
377 | if (result < 0) { | |
378 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), | |
379 | result); | |
380 | goto CleanUpFid; | |
381 | } | |
382 | ||
383 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
384 | ||
385 | file_inode = v9fs_get_inode(sb, newstat.st_mode); | |
386 | if ((!file_inode) || IS_ERR(file_inode)) { | |
387 | dprintk(DEBUG_ERROR, "create inode failed\n"); | |
388 | result = -EBADF; | |
389 | goto CleanUpFid; | |
390 | } | |
391 | ||
392 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); | |
393 | kfree(fcall); | |
394 | d_instantiate(file_dentry, file_inode); | |
395 | ||
396 | if (perm & V9FS_DMDIR) { | |
397 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
398 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", | |
399 | FCALL_ERROR(fcall)); | |
400 | ||
401 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
402 | kfree(fcall); | |
403 | fid->fidopen = 0; | |
404 | fid->fidcreate = 0; | |
405 | d_drop(file_dentry); | |
406 | } | |
407 | ||
408 | return 0; | |
409 | ||
410 | CleanUpFid: | |
411 | kfree(fcall); | |
412 | ||
413 | if (newfid) { | |
414 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
415 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", | |
416 | FCALL_ERROR(fcall)); | |
417 | ||
418 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
419 | kfree(fcall); | |
420 | } | |
421 | return result; | |
422 | } | |
423 | ||
424 | /** | |
425 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
426 | * @dir: directory inode that is being deleted |
427 | * @file: dentry that is being deleted | |
428 | * @rmdir: removing a directory | |
2bad8471 EVH |
429 | * |
430 | */ | |
431 | ||
432 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
433 | { | |
434 | struct v9fs_fcall *fcall = NULL; | |
435 | struct super_block *sb = NULL; | |
436 | struct v9fs_session_info *v9ses = NULL; | |
437 | struct v9fs_fid *v9fid = NULL; | |
438 | struct inode *file_inode = NULL; | |
439 | int fid = -1; | |
440 | int result = 0; | |
441 | ||
442 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
443 | rmdir); | |
444 | ||
445 | file_inode = file->d_inode; | |
446 | sb = file_inode->i_sb; | |
447 | v9ses = v9fs_inode2v9ses(file_inode); | |
448 | v9fid = v9fs_fid_lookup(file, FID_OP); | |
449 | ||
450 | if (!v9fid) { | |
451 | dprintk(DEBUG_ERROR, | |
452 | "no v9fs_fid\n"); | |
453 | return -EBADF; | |
454 | } | |
455 | ||
456 | fid = v9fid->fid; | |
457 | if (fid < 0) { | |
458 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
459 | file_inode->i_ino); | |
460 | return -EBADF; | |
461 | } | |
462 | ||
463 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
464 | if (result < 0) | |
465 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", | |
466 | FCALL_ERROR(fcall), result); | |
467 | else { | |
468 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
469 | v9fs_fid_destroy(v9fid); | |
470 | } | |
471 | ||
472 | kfree(fcall); | |
473 | return result; | |
474 | } | |
475 | ||
476 | /** | |
477 | * v9fs_vfs_create - VFS hook to create files | |
478 | * @inode: directory inode that is being deleted | |
479 | * @dentry: dentry that is being deleted | |
480 | * @perm: create permissions | |
481 | * @nd: path information | |
482 | * | |
483 | */ | |
484 | ||
485 | static int | |
486 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, | |
487 | struct nameidata *nd) | |
488 | { | |
489 | return v9fs_create(inode, dentry, perm, O_RDWR); | |
490 | } | |
491 | ||
492 | /** | |
493 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 494 | * @inode: inode that is being unlinked |
2bad8471 EVH |
495 | * @dentry: dentry that is being unlinked |
496 | * @mode: mode for new directory | |
497 | * | |
498 | */ | |
499 | ||
500 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) | |
501 | { | |
502 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); | |
503 | } | |
504 | ||
505 | /** | |
506 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
507 | * @dir: inode that is being walked from | |
508 | * @dentry: dentry that is being walked to? | |
509 | * @nameidata: path data | |
510 | * | |
511 | */ | |
512 | ||
513 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
514 | struct nameidata *nameidata) | |
515 | { | |
516 | struct super_block *sb; | |
517 | struct v9fs_session_info *v9ses; | |
518 | struct v9fs_fid *dirfid; | |
519 | struct v9fs_fid *fid; | |
520 | struct inode *inode; | |
521 | struct v9fs_fcall *fcall = NULL; | |
522 | struct stat newstat; | |
523 | int dirfidnum = -1; | |
524 | int newfid = -1; | |
525 | int result = 0; | |
526 | ||
527 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
528 | dir, dentry->d_iname, dentry, nameidata); | |
529 | ||
530 | sb = dir->i_sb; | |
531 | v9ses = v9fs_inode2v9ses(dir); | |
532 | dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); | |
533 | ||
534 | if (!dirfid) { | |
535 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
536 | return ERR_PTR(-EINVAL); | |
537 | } | |
538 | ||
539 | dirfidnum = dirfid->fid; | |
540 | ||
541 | if (dirfidnum < 0) { | |
542 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
543 | dir, dir->i_ino); | |
544 | return ERR_PTR(-EBADF); | |
545 | } | |
546 | ||
547 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
548 | if (newfid < 0) { | |
549 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
550 | return ERR_PTR(-ENOSPC); | |
551 | } | |
552 | ||
553 | result = | |
554 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, | |
555 | NULL); | |
556 | if (result < 0) { | |
557 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
558 | if (result == -ENOENT) { | |
559 | d_add(dentry, NULL); | |
560 | dprintk(DEBUG_ERROR, | |
561 | "Return negative dentry %p count %d\n", | |
562 | dentry, atomic_read(&dentry->d_count)); | |
563 | return NULL; | |
564 | } | |
565 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
566 | goto FreeFcall; | |
567 | } | |
568 | ||
569 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
570 | if (result < 0) { | |
571 | dprintk(DEBUG_ERROR, "stat error\n"); | |
572 | goto FreeFcall; | |
573 | } | |
574 | ||
575 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
576 | inode = v9fs_get_inode(sb, newstat.st_mode); | |
577 | ||
578 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
579 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
580 | PTR_ERR(inode)); | |
581 | ||
582 | result = -ENOSPC; | |
583 | goto FreeFcall; | |
584 | } | |
585 | ||
586 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
587 | ||
588 | fid = v9fs_fid_create(dentry); | |
589 | if (fid == NULL) { | |
590 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
591 | result = -ENOMEM; | |
592 | goto FreeFcall; | |
593 | } | |
594 | ||
595 | fid->fid = newfid; | |
596 | fid->fidopen = 0; | |
597 | fid->v9ses = v9ses; | |
598 | fid->qid = fcall->params.rstat.stat->qid; | |
599 | ||
600 | dentry->d_op = &v9fs_dentry_operations; | |
601 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); | |
602 | ||
603 | d_add(dentry, inode); | |
604 | kfree(fcall); | |
605 | ||
606 | return NULL; | |
607 | ||
608 | FreeFcall: | |
609 | kfree(fcall); | |
610 | return ERR_PTR(result); | |
611 | } | |
612 | ||
613 | /** | |
614 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
615 | * @i: inode that is being unlinked | |
73c592b9 | 616 | * @d: dentry that is being unlinked |
2bad8471 EVH |
617 | * |
618 | */ | |
619 | ||
620 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
621 | { | |
622 | return v9fs_remove(i, d, 0); | |
623 | } | |
624 | ||
625 | /** | |
626 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
627 | * @i: inode that is being unlinked | |
73c592b9 | 628 | * @d: dentry that is being unlinked |
2bad8471 EVH |
629 | * |
630 | */ | |
631 | ||
632 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
633 | { | |
634 | return v9fs_remove(i, d, 1); | |
635 | } | |
636 | ||
637 | /** | |
638 | * v9fs_vfs_rename - VFS hook to rename an inode | |
639 | * @old_dir: old dir inode | |
640 | * @old_dentry: old dentry | |
641 | * @new_dir: new dir inode | |
642 | * @new_dentry: new dentry | |
643 | * | |
644 | */ | |
645 | ||
646 | static int | |
647 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
648 | struct inode *new_dir, struct dentry *new_dentry) | |
649 | { | |
650 | struct inode *old_inode = old_dentry->d_inode; | |
651 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
652 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK); | |
653 | struct v9fs_fid *olddirfid = | |
654 | v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); | |
655 | struct v9fs_fid *newdirfid = | |
656 | v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); | |
657 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
658 | struct v9fs_fcall *fcall = NULL; | |
659 | int fid = -1; | |
660 | int olddirfidnum = -1; | |
661 | int newdirfidnum = -1; | |
662 | int retval = 0; | |
663 | ||
664 | dprintk(DEBUG_VFS, "\n"); | |
665 | ||
73c592b9 EVH |
666 | if (!mistat) |
667 | return -ENOMEM; | |
668 | ||
2bad8471 EVH |
669 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { |
670 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
671 | return -EBADF; | |
672 | } | |
673 | ||
674 | /* 9P can only handle file rename in the same directory */ | |
675 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
676 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
677 | retval = -EPERM; | |
678 | goto FreeFcallnBail; | |
679 | } | |
680 | ||
681 | fid = oldfid->fid; | |
682 | olddirfidnum = olddirfid->fid; | |
683 | newdirfidnum = newdirfid->fid; | |
684 | ||
685 | if (fid < 0) { | |
686 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
687 | old_inode->i_ino); | |
688 | retval = -EBADF; | |
689 | goto FreeFcallnBail; | |
690 | } | |
691 | ||
692 | v9fs_blank_mistat(v9ses, mistat); | |
693 | ||
694 | strcpy(mistat->data + 1, v9ses->name); | |
695 | mistat->name = mistat->data + 1 + strlen(v9ses->name); | |
696 | ||
697 | if (new_dentry->d_name.len > | |
698 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { | |
699 | dprintk(DEBUG_ERROR, "new name too long\n"); | |
700 | goto FreeFcallnBail; | |
701 | } | |
702 | ||
703 | strcpy(mistat->name, new_dentry->d_name.name); | |
704 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); | |
705 | ||
706 | FreeFcallnBail: | |
707 | kfree(mistat); | |
708 | ||
709 | if (retval < 0) | |
710 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
711 | FCALL_ERROR(fcall)); | |
712 | ||
713 | kfree(fcall); | |
714 | return retval; | |
715 | } | |
716 | ||
717 | /** | |
718 | * v9fs_vfs_getattr - retreive file metadata | |
719 | * @mnt - mount information | |
720 | * @dentry - file to get attributes on | |
721 | * @stat - metadata structure to populate | |
722 | * | |
723 | */ | |
724 | ||
725 | static int | |
726 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
727 | struct kstat *stat) | |
728 | { | |
729 | struct v9fs_fcall *fcall = NULL; | |
730 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
731 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
732 | int err = -EPERM; | |
733 | ||
734 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
735 | if (!fid) { | |
736 | dprintk(DEBUG_ERROR, | |
737 | "couldn't find fid associated with dentry\n"); | |
738 | return -EBADF; | |
739 | } | |
740 | ||
741 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
742 | ||
743 | if (err < 0) | |
744 | dprintk(DEBUG_ERROR, "stat error\n"); | |
745 | else { | |
746 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, | |
747 | dentry->d_inode->i_sb); | |
748 | generic_fillattr(dentry->d_inode, stat); | |
749 | } | |
750 | ||
751 | kfree(fcall); | |
752 | return err; | |
753 | } | |
754 | ||
755 | /** | |
756 | * v9fs_vfs_setattr - set file metadata | |
757 | * @dentry: file whose metadata to set | |
758 | * @iattr: metadata assignment structure | |
759 | * | |
760 | */ | |
761 | ||
762 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
763 | { | |
764 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
765 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
2bad8471 | 766 | struct v9fs_fcall *fcall = NULL; |
73c592b9 | 767 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
2bad8471 EVH |
768 | int res = -EPERM; |
769 | ||
770 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 EVH |
771 | |
772 | if (!mistat) | |
773 | return -ENOMEM; | |
774 | ||
2bad8471 EVH |
775 | if (!fid) { |
776 | dprintk(DEBUG_ERROR, | |
777 | "Couldn't find fid associated with dentry\n"); | |
778 | return -EBADF; | |
779 | } | |
780 | ||
2bad8471 EVH |
781 | v9fs_blank_mistat(v9ses, mistat); |
782 | if (iattr->ia_valid & ATTR_MODE) | |
783 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); | |
784 | ||
785 | if (iattr->ia_valid & ATTR_MTIME) | |
786 | mistat->mtime = iattr->ia_mtime.tv_sec; | |
787 | ||
788 | if (iattr->ia_valid & ATTR_ATIME) | |
789 | mistat->atime = iattr->ia_atime.tv_sec; | |
790 | ||
791 | if (iattr->ia_valid & ATTR_SIZE) | |
792 | mistat->length = iattr->ia_size; | |
793 | ||
794 | if (v9ses->extended) { | |
73c592b9 | 795 | char *ptr = mistat->data+1; |
2bad8471 EVH |
796 | |
797 | if (iattr->ia_valid & ATTR_UID) { | |
73c592b9 EVH |
798 | mistat->uid = ptr; |
799 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); | |
2bad8471 EVH |
800 | mistat->n_uid = iattr->ia_uid; |
801 | } | |
802 | ||
803 | if (iattr->ia_valid & ATTR_GID) { | |
73c592b9 EVH |
804 | mistat->gid = ptr; |
805 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); | |
2bad8471 EVH |
806 | mistat->n_gid = iattr->ia_gid; |
807 | } | |
2bad8471 EVH |
808 | } |
809 | ||
810 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); | |
811 | ||
812 | if (res < 0) | |
813 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); | |
814 | ||
815 | kfree(mistat); | |
816 | kfree(fcall); | |
817 | ||
818 | if (res >= 0) | |
819 | res = inode_setattr(dentry->d_inode, iattr); | |
820 | ||
821 | return res; | |
822 | } | |
823 | ||
824 | /** | |
825 | * v9fs_mistat2inode - populate an inode structure with mistat info | |
826 | * @mistat: Plan 9 metadata (mistat) structure | |
827 | * @inode: inode to populate | |
828 | * @sb: superblock of filesystem | |
829 | * | |
830 | */ | |
831 | ||
832 | void | |
833 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, | |
834 | struct super_block *sb) | |
835 | { | |
836 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
837 | ||
838 | inode->i_nlink = 1; | |
839 | ||
840 | inode->i_atime.tv_sec = mistat->atime; | |
841 | inode->i_mtime.tv_sec = mistat->mtime; | |
842 | inode->i_ctime.tv_sec = mistat->mtime; | |
843 | ||
844 | inode->i_uid = -1; | |
845 | inode->i_gid = -1; | |
846 | ||
847 | if (v9ses->extended) { | |
848 | /* TODO: string to uid mapping via user-space daemon */ | |
849 | inode->i_uid = mistat->n_uid; | |
850 | inode->i_gid = mistat->n_gid; | |
851 | ||
852 | if (mistat->n_uid == -1) | |
853 | sscanf(mistat->uid, "%x", &inode->i_uid); | |
854 | ||
855 | if (mistat->n_gid == -1) | |
856 | sscanf(mistat->gid, "%x", &inode->i_gid); | |
857 | } | |
858 | ||
859 | if (inode->i_uid == -1) | |
860 | inode->i_uid = v9ses->uid; | |
861 | if (inode->i_gid == -1) | |
862 | inode->i_gid = v9ses->gid; | |
863 | ||
864 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); | |
865 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { | |
866 | char type = 0; | |
867 | int major = -1; | |
868 | int minor = -1; | |
869 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
870 | switch (type) { | |
871 | case 'c': | |
872 | inode->i_mode &= ~S_IFBLK; | |
873 | inode->i_mode |= S_IFCHR; | |
874 | break; | |
875 | case 'b': | |
876 | break; | |
877 | default: | |
878 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
879 | type, mistat->extension); | |
880 | }; | |
881 | inode->i_rdev = MKDEV(major, minor); | |
882 | } else | |
883 | inode->i_rdev = 0; | |
884 | ||
885 | inode->i_size = mistat->length; | |
886 | ||
887 | inode->i_blksize = sb->s_blocksize; | |
888 | inode->i_blocks = | |
889 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
890 | } | |
891 | ||
892 | /** | |
893 | * v9fs_qid2ino - convert qid into inode number | |
894 | * @qid: qid to hash | |
895 | * | |
896 | * BUG: potential for inode number collisions? | |
897 | */ | |
898 | ||
899 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
900 | { | |
901 | u64 path = qid->path + 2; | |
902 | ino_t i = 0; | |
903 | ||
904 | if (sizeof(ino_t) == sizeof(path)) | |
905 | memcpy(&i, &path, sizeof(ino_t)); | |
906 | else | |
907 | i = (ino_t) (path ^ (path >> 32)); | |
908 | ||
909 | return i; | |
910 | } | |
911 | ||
912 | /** | |
913 | * v9fs_vfs_symlink - helper function to create symlinks | |
914 | * @dir: directory inode containing symlink | |
915 | * @dentry: dentry for symlink | |
916 | * @symname: symlink data | |
917 | * | |
918 | * See 9P2000.u RFC for more information | |
919 | * | |
920 | */ | |
921 | ||
922 | static int | |
923 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
924 | { | |
925 | int retval = -EPERM; | |
926 | struct v9fs_fid *newfid; | |
927 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
2bad8471 EVH |
928 | struct v9fs_fcall *fcall = NULL; |
929 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
930 | ||
931 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
932 | symname); | |
933 | ||
73c592b9 EVH |
934 | if (!mistat) |
935 | return -ENOMEM; | |
2bad8471 EVH |
936 | |
937 | if (!v9ses->extended) { | |
938 | dprintk(DEBUG_ERROR, "not extended\n"); | |
939 | goto FreeFcall; | |
940 | } | |
941 | ||
942 | /* issue a create */ | |
943 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); | |
944 | if (retval != 0) | |
945 | goto FreeFcall; | |
946 | ||
947 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
948 | ||
949 | /* issue a twstat */ | |
950 | v9fs_blank_mistat(v9ses, mistat); | |
951 | strcpy(mistat->data + 1, symname); | |
952 | mistat->extension = mistat->data + 1; | |
953 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
954 | if (retval < 0) { | |
955 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
956 | FCALL_ERROR(fcall)); | |
957 | goto FreeFcall; | |
958 | } | |
959 | ||
960 | kfree(fcall); | |
961 | ||
962 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
963 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
964 | FCALL_ERROR(fcall)); | |
965 | goto FreeFcall; | |
966 | } | |
967 | ||
968 | d_drop(dentry); /* FID - will this also clunk? */ | |
969 | ||
970 | FreeFcall: | |
971 | kfree(mistat); | |
972 | kfree(fcall); | |
973 | ||
974 | return retval; | |
975 | } | |
976 | ||
977 | /** | |
978 | * v9fs_readlink - read a symlink's location (internal version) | |
979 | * @dentry: dentry for symlink | |
73c592b9 | 980 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
981 | * @buflen: length of buffer |
982 | * | |
983 | */ | |
984 | ||
985 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
986 | { | |
987 | int retval = -EPERM; | |
988 | ||
989 | struct v9fs_fcall *fcall = NULL; | |
990 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
991 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
992 | ||
993 | if (!fid) { | |
994 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
995 | retval = -EBADF; | |
996 | goto FreeFcall; | |
997 | } | |
998 | ||
999 | if (!v9ses->extended) { | |
1000 | retval = -EBADF; | |
1001 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1002 | goto FreeFcall; | |
1003 | } | |
1004 | ||
1005 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1006 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1007 | ||
1008 | if (retval < 0) { | |
1009 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1010 | goto FreeFcall; | |
1011 | } | |
1012 | ||
1013 | if (!fcall) | |
1014 | return -EIO; | |
1015 | ||
1016 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { | |
1017 | retval = -EINVAL; | |
1018 | goto FreeFcall; | |
1019 | } | |
1020 | ||
1021 | /* copy extension buffer into buffer */ | |
1022 | if (strlen(fcall->params.rstat.stat->extension) < buflen) | |
1023 | buflen = strlen(fcall->params.rstat.stat->extension); | |
1024 | ||
1025 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); | |
1026 | ||
1027 | retval = buflen; | |
1028 | ||
1029 | FreeFcall: | |
1030 | kfree(fcall); | |
1031 | ||
1032 | return retval; | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * v9fs_vfs_readlink - read a symlink's location | |
1037 | * @dentry: dentry for symlink | |
1038 | * @buf: buffer to load symlink location into | |
1039 | * @buflen: length of buffer | |
1040 | * | |
1041 | */ | |
1042 | ||
1043 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1044 | int buflen) | |
1045 | { | |
1046 | int retval; | |
1047 | int ret; | |
1048 | char *link = __getname(); | |
1049 | ||
1050 | if (strlen(link) < buflen) | |
1051 | buflen = strlen(link); | |
1052 | ||
1053 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1054 | ||
1055 | retval = v9fs_readlink(dentry, link, buflen); | |
1056 | ||
1057 | if (retval > 0) { | |
1058 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1059 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1060 | ret); | |
1061 | retval = ret; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | putname(link); | |
1066 | return retval; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * v9fs_vfs_follow_link - follow a symlink path | |
1071 | * @dentry: dentry for symlink | |
1072 | * @nd: nameidata | |
1073 | * | |
1074 | */ | |
1075 | ||
1076 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1077 | { | |
1078 | int len = 0; | |
1079 | char *link = __getname(); | |
1080 | ||
1081 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1082 | ||
1083 | if (!link) | |
1084 | link = ERR_PTR(-ENOMEM); | |
1085 | else { | |
1086 | len = v9fs_readlink(dentry, link, strlen(link)); | |
1087 | ||
1088 | if (len < 0) { | |
1089 | putname(link); | |
1090 | link = ERR_PTR(len); | |
1091 | } else | |
1092 | link[len] = 0; | |
1093 | } | |
1094 | nd_set_link(nd, link); | |
1095 | ||
1096 | return NULL; | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * v9fs_vfs_put_link - release a symlink path | |
1101 | * @dentry: dentry for symlink | |
1102 | * @nd: nameidata | |
1103 | * | |
1104 | */ | |
1105 | ||
1106 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1107 | { | |
1108 | char *s = nd_get_link(nd); | |
1109 | ||
1110 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1111 | if (!IS_ERR(s)) | |
1112 | putname(s); | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * v9fs_vfs_link - create a hardlink | |
1117 | * @old_dentry: dentry for file to link to | |
1118 | * @dir: inode destination for new link | |
73c592b9 | 1119 | * @dentry: dentry for link |
2bad8471 EVH |
1120 | * |
1121 | */ | |
1122 | ||
1123 | /* XXX - lots of code dup'd from symlink and creates, | |
1124 | * figure out a better reuse strategy | |
1125 | */ | |
1126 | ||
1127 | static int | |
1128 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1129 | struct dentry *dentry) | |
1130 | { | |
1131 | int retval = -EPERM; | |
1132 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1133 | struct v9fs_fcall *fcall = NULL; | |
1134 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1135 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); | |
1136 | struct v9fs_fid *newfid = NULL; | |
1137 | char *symname = __getname(); | |
1138 | ||
1139 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1140 | old_dentry->d_name.name); | |
1141 | ||
1142 | if (!v9ses->extended) { | |
1143 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1144 | goto FreeMem; | |
1145 | } | |
1146 | ||
1147 | /* get fid of old_dentry */ | |
1148 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); | |
1149 | ||
1150 | /* issue a create */ | |
1151 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); | |
1152 | if (retval != 0) | |
1153 | goto FreeMem; | |
1154 | ||
1155 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1156 | if (!newfid) { | |
1157 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); | |
1158 | goto FreeMem; | |
1159 | } | |
1160 | ||
1161 | /* issue a twstat */ | |
1162 | v9fs_blank_mistat(v9ses, mistat); | |
1163 | strcpy(mistat->data + 1, symname); | |
1164 | mistat->extension = mistat->data + 1; | |
1165 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1166 | if (retval < 0) { | |
1167 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1168 | FCALL_ERROR(fcall)); | |
1169 | goto FreeMem; | |
1170 | } | |
1171 | ||
1172 | kfree(fcall); | |
1173 | ||
1174 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1175 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1176 | FCALL_ERROR(fcall)); | |
1177 | goto FreeMem; | |
1178 | } | |
1179 | ||
1180 | d_drop(dentry); /* FID - will this also clunk? */ | |
1181 | ||
1182 | kfree(fcall); | |
1183 | fcall = NULL; | |
1184 | ||
1185 | FreeMem: | |
1186 | kfree(mistat); | |
1187 | kfree(fcall); | |
1188 | putname(symname); | |
1189 | return retval; | |
1190 | } | |
1191 | ||
1192 | /** | |
1193 | * v9fs_vfs_mknod - create a special file | |
1194 | * @dir: inode destination for new link | |
1195 | * @dentry: dentry for file | |
1196 | * @mode: mode for creation | |
1197 | * @dev_t: device associated with special file | |
1198 | * | |
1199 | */ | |
1200 | ||
1201 | static int | |
1202 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1203 | { | |
1204 | int retval = -EPERM; | |
1205 | struct v9fs_fid *newfid; | |
1206 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1207 | struct v9fs_fcall *fcall = NULL; | |
1208 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1209 | char *symname = __getname(); | |
1210 | ||
1211 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1212 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1213 | ||
73c592b9 EVH |
1214 | if (!mistat) |
1215 | return -ENOMEM; | |
1216 | ||
2bad8471 EVH |
1217 | if (!new_valid_dev(rdev)) { |
1218 | retval = -EINVAL; | |
1219 | goto FreeMem; | |
1220 | } | |
1221 | ||
1222 | if (!v9ses->extended) { | |
1223 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1224 | goto FreeMem; | |
1225 | } | |
1226 | ||
1227 | /* issue a create */ | |
1228 | retval = v9fs_create(dir, dentry, mode, 0); | |
1229 | ||
1230 | if (retval != 0) | |
1231 | goto FreeMem; | |
1232 | ||
1233 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1234 | if (!newfid) { | |
1235 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); | |
1236 | retval = -EINVAL; | |
1237 | goto FreeMem; | |
1238 | } | |
1239 | ||
1240 | /* build extension */ | |
1241 | if (S_ISBLK(mode)) | |
1242 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); | |
1243 | else if (S_ISCHR(mode)) | |
1244 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); | |
73c592b9 EVH |
1245 | else if (S_ISFIFO(mode)) |
1246 | ; /* DO NOTHING */ | |
2bad8471 EVH |
1247 | else { |
1248 | retval = -EINVAL; | |
1249 | goto FreeMem; | |
1250 | } | |
1251 | ||
1252 | if (!S_ISFIFO(mode)) { | |
1253 | /* issue a twstat */ | |
1254 | v9fs_blank_mistat(v9ses, mistat); | |
1255 | strcpy(mistat->data + 1, symname); | |
1256 | mistat->extension = mistat->data + 1; | |
1257 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1258 | if (retval < 0) { | |
1259 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1260 | FCALL_ERROR(fcall)); | |
1261 | goto FreeMem; | |
1262 | } | |
2bad8471 EVH |
1263 | } |
1264 | ||
1265 | /* need to update dcache so we show up */ | |
1266 | kfree(fcall); | |
1267 | ||
1268 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1269 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1270 | FCALL_ERROR(fcall)); | |
1271 | goto FreeMem; | |
1272 | } | |
1273 | ||
1274 | d_drop(dentry); /* FID - will this also clunk? */ | |
1275 | ||
1276 | FreeMem: | |
1277 | kfree(mistat); | |
1278 | kfree(fcall); | |
1279 | putname(symname); | |
1280 | ||
1281 | return retval; | |
1282 | } | |
1283 | ||
1284 | static struct inode_operations v9fs_dir_inode_operations = { | |
1285 | .create = v9fs_vfs_create, | |
1286 | .lookup = v9fs_vfs_lookup, | |
1287 | .symlink = v9fs_vfs_symlink, | |
1288 | .link = v9fs_vfs_link, | |
1289 | .unlink = v9fs_vfs_unlink, | |
1290 | .mkdir = v9fs_vfs_mkdir, | |
1291 | .rmdir = v9fs_vfs_rmdir, | |
1292 | .mknod = v9fs_vfs_mknod, | |
1293 | .rename = v9fs_vfs_rename, | |
1294 | .readlink = v9fs_vfs_readlink, | |
1295 | .getattr = v9fs_vfs_getattr, | |
1296 | .setattr = v9fs_vfs_setattr, | |
1297 | }; | |
1298 | ||
1299 | static struct inode_operations v9fs_file_inode_operations = { | |
1300 | .getattr = v9fs_vfs_getattr, | |
1301 | .setattr = v9fs_vfs_setattr, | |
1302 | }; | |
1303 | ||
1304 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1305 | .readlink = v9fs_vfs_readlink, | |
1306 | .follow_link = v9fs_vfs_follow_link, | |
1307 | .put_link = v9fs_vfs_put_link, | |
1308 | .getattr = v9fs_vfs_getattr, | |
1309 | .setattr = v9fs_vfs_setattr, | |
1310 | }; |