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 = | |
310 | v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); | |
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; | |
320 | ||
321 | perm = unixmode2p9mode(v9ses, perm); | |
322 | ||
323 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, | |
324 | file_dentry, perm, open_mode); | |
325 | ||
326 | if (!dirfid) | |
327 | return -EBADF; | |
328 | ||
329 | dirfidnum = dirfid->fid; | |
330 | if (dirfidnum < 0) { | |
331 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", | |
332 | dir->i_ino); | |
333 | return -EBADF; | |
334 | } | |
335 | ||
336 | if (file_dentry->d_inode) { | |
337 | dprintk(DEBUG_ERROR, | |
338 | "Odd. There is an inode for dir %lu, name :%s:\n", | |
339 | dir->i_ino, file_dentry->d_name.name); | |
340 | return -EEXIST; | |
341 | } | |
342 | ||
343 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
344 | if (newfid < 0) { | |
345 | eprintk(KERN_WARNING, "no free fids available\n"); | |
346 | return -ENOSPC; | |
347 | } | |
348 | ||
349 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); | |
350 | if (result < 0) { | |
351 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); | |
352 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
353 | newfid = 0; | |
354 | goto CleanUpFid; | |
355 | } | |
356 | ||
357 | kfree(fcall); | |
358 | ||
359 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, | |
360 | perm, open_mode, &fcall); | |
361 | if (result < 0) { | |
362 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", | |
363 | FCALL_ERROR(fcall), result); | |
364 | ||
365 | goto CleanUpFid; | |
366 | } | |
367 | ||
368 | iounit = fcall->params.rcreate.iounit; | |
369 | qid = fcall->params.rcreate.qid; | |
370 | kfree(fcall); | |
371 | ||
372 | fid = v9fs_fid_create(file_dentry); | |
373 | if (!fid) { | |
374 | result = -ENOMEM; | |
375 | goto CleanUpFid; | |
376 | } | |
377 | ||
378 | fid->fid = newfid; | |
379 | fid->fidopen = 0; | |
380 | fid->fidcreate = 1; | |
381 | fid->qid = qid; | |
382 | fid->iounit = iounit; | |
383 | fid->rdir_pos = 0; | |
384 | fid->rdir_fcall = NULL; | |
385 | fid->v9ses = v9ses; | |
386 | ||
387 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || | |
388 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || | |
389 | (perm & V9FS_DMDEVICE)) | |
390 | return 0; | |
391 | ||
392 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
393 | if (result < 0) { | |
394 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), | |
395 | result); | |
396 | goto CleanUpFid; | |
397 | } | |
398 | ||
399 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
400 | ||
401 | file_inode = v9fs_get_inode(sb, newstat.st_mode); | |
402 | if ((!file_inode) || IS_ERR(file_inode)) { | |
403 | dprintk(DEBUG_ERROR, "create inode failed\n"); | |
404 | result = -EBADF; | |
405 | goto CleanUpFid; | |
406 | } | |
407 | ||
408 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); | |
409 | kfree(fcall); | |
410 | d_instantiate(file_dentry, file_inode); | |
411 | ||
412 | if (perm & V9FS_DMDIR) { | |
413 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
414 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", | |
415 | FCALL_ERROR(fcall)); | |
416 | ||
417 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
418 | kfree(fcall); | |
419 | fid->fidopen = 0; | |
420 | fid->fidcreate = 0; | |
421 | d_drop(file_dentry); | |
422 | } | |
423 | ||
424 | return 0; | |
425 | ||
426 | CleanUpFid: | |
427 | kfree(fcall); | |
428 | ||
429 | if (newfid) { | |
430 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) | |
431 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", | |
432 | FCALL_ERROR(fcall)); | |
433 | ||
434 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
435 | kfree(fcall); | |
436 | } | |
437 | return result; | |
438 | } | |
439 | ||
440 | /** | |
441 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 EVH |
442 | * @dir: directory inode that is being deleted |
443 | * @file: dentry that is being deleted | |
444 | * @rmdir: removing a directory | |
2bad8471 EVH |
445 | * |
446 | */ | |
447 | ||
448 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) | |
449 | { | |
450 | struct v9fs_fcall *fcall = NULL; | |
451 | struct super_block *sb = NULL; | |
452 | struct v9fs_session_info *v9ses = NULL; | |
453 | struct v9fs_fid *v9fid = NULL; | |
454 | struct inode *file_inode = NULL; | |
455 | int fid = -1; | |
456 | int result = 0; | |
457 | ||
458 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, | |
459 | rmdir); | |
460 | ||
461 | file_inode = file->d_inode; | |
462 | sb = file_inode->i_sb; | |
463 | v9ses = v9fs_inode2v9ses(file_inode); | |
464 | v9fid = v9fs_fid_lookup(file, FID_OP); | |
465 | ||
466 | if (!v9fid) { | |
467 | dprintk(DEBUG_ERROR, | |
468 | "no v9fs_fid\n"); | |
469 | return -EBADF; | |
470 | } | |
471 | ||
472 | fid = v9fid->fid; | |
473 | if (fid < 0) { | |
474 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", | |
475 | file_inode->i_ino); | |
476 | return -EBADF; | |
477 | } | |
478 | ||
479 | result = v9fs_t_remove(v9ses, fid, &fcall); | |
480 | if (result < 0) | |
481 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", | |
482 | FCALL_ERROR(fcall), result); | |
483 | else { | |
484 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
485 | v9fs_fid_destroy(v9fid); | |
486 | } | |
487 | ||
488 | kfree(fcall); | |
489 | return result; | |
490 | } | |
491 | ||
492 | /** | |
493 | * v9fs_vfs_create - VFS hook to create files | |
494 | * @inode: directory inode that is being deleted | |
495 | * @dentry: dentry that is being deleted | |
496 | * @perm: create permissions | |
497 | * @nd: path information | |
498 | * | |
499 | */ | |
500 | ||
501 | static int | |
502 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, | |
503 | struct nameidata *nd) | |
504 | { | |
505 | return v9fs_create(inode, dentry, perm, O_RDWR); | |
506 | } | |
507 | ||
508 | /** | |
509 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
73c592b9 | 510 | * @inode: inode that is being unlinked |
2bad8471 EVH |
511 | * @dentry: dentry that is being unlinked |
512 | * @mode: mode for new directory | |
513 | * | |
514 | */ | |
515 | ||
516 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) | |
517 | { | |
518 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); | |
519 | } | |
520 | ||
521 | /** | |
522 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
523 | * @dir: inode that is being walked from | |
524 | * @dentry: dentry that is being walked to? | |
525 | * @nameidata: path data | |
526 | * | |
527 | */ | |
528 | ||
529 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, | |
530 | struct nameidata *nameidata) | |
531 | { | |
532 | struct super_block *sb; | |
533 | struct v9fs_session_info *v9ses; | |
534 | struct v9fs_fid *dirfid; | |
535 | struct v9fs_fid *fid; | |
536 | struct inode *inode; | |
537 | struct v9fs_fcall *fcall = NULL; | |
538 | struct stat newstat; | |
539 | int dirfidnum = -1; | |
540 | int newfid = -1; | |
541 | int result = 0; | |
542 | ||
543 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", | |
544 | dir, dentry->d_iname, dentry, nameidata); | |
545 | ||
546 | sb = dir->i_sb; | |
547 | v9ses = v9fs_inode2v9ses(dir); | |
548 | dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); | |
549 | ||
550 | if (!dirfid) { | |
551 | dprintk(DEBUG_ERROR, "no dirfid\n"); | |
552 | return ERR_PTR(-EINVAL); | |
553 | } | |
554 | ||
555 | dirfidnum = dirfid->fid; | |
556 | ||
557 | if (dirfidnum < 0) { | |
558 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", | |
559 | dir, dir->i_ino); | |
560 | return ERR_PTR(-EBADF); | |
561 | } | |
562 | ||
563 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
564 | if (newfid < 0) { | |
565 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
566 | return ERR_PTR(-ENOSPC); | |
567 | } | |
568 | ||
569 | result = | |
570 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, | |
571 | NULL); | |
572 | if (result < 0) { | |
573 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
574 | if (result == -ENOENT) { | |
575 | d_add(dentry, NULL); | |
576 | dprintk(DEBUG_ERROR, | |
577 | "Return negative dentry %p count %d\n", | |
578 | dentry, atomic_read(&dentry->d_count)); | |
579 | return NULL; | |
580 | } | |
581 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); | |
582 | goto FreeFcall; | |
583 | } | |
584 | ||
585 | result = v9fs_t_stat(v9ses, newfid, &fcall); | |
586 | if (result < 0) { | |
587 | dprintk(DEBUG_ERROR, "stat error\n"); | |
588 | goto FreeFcall; | |
589 | } | |
590 | ||
591 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); | |
592 | inode = v9fs_get_inode(sb, newstat.st_mode); | |
593 | ||
594 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { | |
595 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", | |
596 | PTR_ERR(inode)); | |
597 | ||
598 | result = -ENOSPC; | |
599 | goto FreeFcall; | |
600 | } | |
601 | ||
602 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
603 | ||
604 | fid = v9fs_fid_create(dentry); | |
605 | if (fid == NULL) { | |
606 | dprintk(DEBUG_ERROR, "couldn't insert\n"); | |
607 | result = -ENOMEM; | |
608 | goto FreeFcall; | |
609 | } | |
610 | ||
611 | fid->fid = newfid; | |
612 | fid->fidopen = 0; | |
613 | fid->v9ses = v9ses; | |
614 | fid->qid = fcall->params.rstat.stat->qid; | |
615 | ||
616 | dentry->d_op = &v9fs_dentry_operations; | |
617 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); | |
618 | ||
619 | d_add(dentry, inode); | |
620 | kfree(fcall); | |
621 | ||
622 | return NULL; | |
623 | ||
624 | FreeFcall: | |
625 | kfree(fcall); | |
626 | return ERR_PTR(result); | |
627 | } | |
628 | ||
629 | /** | |
630 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
631 | * @i: inode that is being unlinked | |
73c592b9 | 632 | * @d: dentry that is being unlinked |
2bad8471 EVH |
633 | * |
634 | */ | |
635 | ||
636 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) | |
637 | { | |
638 | return v9fs_remove(i, d, 0); | |
639 | } | |
640 | ||
641 | /** | |
642 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
643 | * @i: inode that is being unlinked | |
73c592b9 | 644 | * @d: dentry that is being unlinked |
2bad8471 EVH |
645 | * |
646 | */ | |
647 | ||
648 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) | |
649 | { | |
650 | return v9fs_remove(i, d, 1); | |
651 | } | |
652 | ||
653 | /** | |
654 | * v9fs_vfs_rename - VFS hook to rename an inode | |
655 | * @old_dir: old dir inode | |
656 | * @old_dentry: old dentry | |
657 | * @new_dir: new dir inode | |
658 | * @new_dentry: new dentry | |
659 | * | |
660 | */ | |
661 | ||
662 | static int | |
663 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
664 | struct inode *new_dir, struct dentry *new_dentry) | |
665 | { | |
666 | struct inode *old_inode = old_dentry->d_inode; | |
667 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); | |
668 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK); | |
669 | struct v9fs_fid *olddirfid = | |
670 | v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); | |
671 | struct v9fs_fid *newdirfid = | |
672 | v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); | |
673 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
674 | struct v9fs_fcall *fcall = NULL; | |
675 | int fid = -1; | |
676 | int olddirfidnum = -1; | |
677 | int newdirfidnum = -1; | |
678 | int retval = 0; | |
679 | ||
680 | dprintk(DEBUG_VFS, "\n"); | |
681 | ||
73c592b9 EVH |
682 | if (!mistat) |
683 | return -ENOMEM; | |
684 | ||
2bad8471 EVH |
685 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { |
686 | dprintk(DEBUG_ERROR, "problem with arguments\n"); | |
687 | return -EBADF; | |
688 | } | |
689 | ||
690 | /* 9P can only handle file rename in the same directory */ | |
691 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { | |
692 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); | |
693 | retval = -EPERM; | |
694 | goto FreeFcallnBail; | |
695 | } | |
696 | ||
697 | fid = oldfid->fid; | |
698 | olddirfidnum = olddirfid->fid; | |
699 | newdirfidnum = newdirfid->fid; | |
700 | ||
701 | if (fid < 0) { | |
702 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", | |
703 | old_inode->i_ino); | |
704 | retval = -EBADF; | |
705 | goto FreeFcallnBail; | |
706 | } | |
707 | ||
708 | v9fs_blank_mistat(v9ses, mistat); | |
709 | ||
710 | strcpy(mistat->data + 1, v9ses->name); | |
711 | mistat->name = mistat->data + 1 + strlen(v9ses->name); | |
712 | ||
713 | if (new_dentry->d_name.len > | |
714 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { | |
715 | dprintk(DEBUG_ERROR, "new name too long\n"); | |
716 | goto FreeFcallnBail; | |
717 | } | |
718 | ||
719 | strcpy(mistat->name, new_dentry->d_name.name); | |
720 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); | |
721 | ||
722 | FreeFcallnBail: | |
723 | kfree(mistat); | |
724 | ||
725 | if (retval < 0) | |
726 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
727 | FCALL_ERROR(fcall)); | |
728 | ||
729 | kfree(fcall); | |
730 | return retval; | |
731 | } | |
732 | ||
733 | /** | |
734 | * v9fs_vfs_getattr - retreive file metadata | |
735 | * @mnt - mount information | |
736 | * @dentry - file to get attributes on | |
737 | * @stat - metadata structure to populate | |
738 | * | |
739 | */ | |
740 | ||
741 | static int | |
742 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
743 | struct kstat *stat) | |
744 | { | |
745 | struct v9fs_fcall *fcall = NULL; | |
746 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
747 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
748 | int err = -EPERM; | |
749 | ||
750 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); | |
751 | if (!fid) { | |
752 | dprintk(DEBUG_ERROR, | |
753 | "couldn't find fid associated with dentry\n"); | |
754 | return -EBADF; | |
755 | } | |
756 | ||
757 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
758 | ||
759 | if (err < 0) | |
760 | dprintk(DEBUG_ERROR, "stat error\n"); | |
761 | else { | |
762 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, | |
763 | dentry->d_inode->i_sb); | |
764 | generic_fillattr(dentry->d_inode, stat); | |
765 | } | |
766 | ||
767 | kfree(fcall); | |
768 | return err; | |
769 | } | |
770 | ||
771 | /** | |
772 | * v9fs_vfs_setattr - set file metadata | |
773 | * @dentry: file whose metadata to set | |
774 | * @iattr: metadata assignment structure | |
775 | * | |
776 | */ | |
777 | ||
778 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
779 | { | |
780 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
781 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
2bad8471 | 782 | struct v9fs_fcall *fcall = NULL; |
73c592b9 | 783 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
2bad8471 EVH |
784 | int res = -EPERM; |
785 | ||
786 | dprintk(DEBUG_VFS, "\n"); | |
73c592b9 EVH |
787 | |
788 | if (!mistat) | |
789 | return -ENOMEM; | |
790 | ||
2bad8471 EVH |
791 | if (!fid) { |
792 | dprintk(DEBUG_ERROR, | |
793 | "Couldn't find fid associated with dentry\n"); | |
794 | return -EBADF; | |
795 | } | |
796 | ||
2bad8471 EVH |
797 | v9fs_blank_mistat(v9ses, mistat); |
798 | if (iattr->ia_valid & ATTR_MODE) | |
799 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); | |
800 | ||
801 | if (iattr->ia_valid & ATTR_MTIME) | |
802 | mistat->mtime = iattr->ia_mtime.tv_sec; | |
803 | ||
804 | if (iattr->ia_valid & ATTR_ATIME) | |
805 | mistat->atime = iattr->ia_atime.tv_sec; | |
806 | ||
807 | if (iattr->ia_valid & ATTR_SIZE) | |
808 | mistat->length = iattr->ia_size; | |
809 | ||
810 | if (v9ses->extended) { | |
73c592b9 | 811 | char *ptr = mistat->data+1; |
2bad8471 EVH |
812 | |
813 | if (iattr->ia_valid & ATTR_UID) { | |
73c592b9 EVH |
814 | mistat->uid = ptr; |
815 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); | |
2bad8471 EVH |
816 | mistat->n_uid = iattr->ia_uid; |
817 | } | |
818 | ||
819 | if (iattr->ia_valid & ATTR_GID) { | |
73c592b9 EVH |
820 | mistat->gid = ptr; |
821 | ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); | |
2bad8471 EVH |
822 | mistat->n_gid = iattr->ia_gid; |
823 | } | |
2bad8471 EVH |
824 | } |
825 | ||
826 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); | |
827 | ||
828 | if (res < 0) | |
829 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); | |
830 | ||
831 | kfree(mistat); | |
832 | kfree(fcall); | |
833 | ||
834 | if (res >= 0) | |
835 | res = inode_setattr(dentry->d_inode, iattr); | |
836 | ||
837 | return res; | |
838 | } | |
839 | ||
840 | /** | |
841 | * v9fs_mistat2inode - populate an inode structure with mistat info | |
842 | * @mistat: Plan 9 metadata (mistat) structure | |
843 | * @inode: inode to populate | |
844 | * @sb: superblock of filesystem | |
845 | * | |
846 | */ | |
847 | ||
848 | void | |
849 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, | |
850 | struct super_block *sb) | |
851 | { | |
852 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
853 | ||
854 | inode->i_nlink = 1; | |
855 | ||
856 | inode->i_atime.tv_sec = mistat->atime; | |
857 | inode->i_mtime.tv_sec = mistat->mtime; | |
858 | inode->i_ctime.tv_sec = mistat->mtime; | |
859 | ||
860 | inode->i_uid = -1; | |
861 | inode->i_gid = -1; | |
862 | ||
863 | if (v9ses->extended) { | |
864 | /* TODO: string to uid mapping via user-space daemon */ | |
865 | inode->i_uid = mistat->n_uid; | |
866 | inode->i_gid = mistat->n_gid; | |
867 | ||
868 | if (mistat->n_uid == -1) | |
869 | sscanf(mistat->uid, "%x", &inode->i_uid); | |
870 | ||
871 | if (mistat->n_gid == -1) | |
872 | sscanf(mistat->gid, "%x", &inode->i_gid); | |
873 | } | |
874 | ||
875 | if (inode->i_uid == -1) | |
876 | inode->i_uid = v9ses->uid; | |
877 | if (inode->i_gid == -1) | |
878 | inode->i_gid = v9ses->gid; | |
879 | ||
880 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); | |
881 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { | |
882 | char type = 0; | |
883 | int major = -1; | |
884 | int minor = -1; | |
885 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); | |
886 | switch (type) { | |
887 | case 'c': | |
888 | inode->i_mode &= ~S_IFBLK; | |
889 | inode->i_mode |= S_IFCHR; | |
890 | break; | |
891 | case 'b': | |
892 | break; | |
893 | default: | |
894 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", | |
895 | type, mistat->extension); | |
896 | }; | |
897 | inode->i_rdev = MKDEV(major, minor); | |
898 | } else | |
899 | inode->i_rdev = 0; | |
900 | ||
901 | inode->i_size = mistat->length; | |
902 | ||
903 | inode->i_blksize = sb->s_blocksize; | |
904 | inode->i_blocks = | |
905 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; | |
906 | } | |
907 | ||
908 | /** | |
909 | * v9fs_qid2ino - convert qid into inode number | |
910 | * @qid: qid to hash | |
911 | * | |
912 | * BUG: potential for inode number collisions? | |
913 | */ | |
914 | ||
915 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) | |
916 | { | |
917 | u64 path = qid->path + 2; | |
918 | ino_t i = 0; | |
919 | ||
920 | if (sizeof(ino_t) == sizeof(path)) | |
921 | memcpy(&i, &path, sizeof(ino_t)); | |
922 | else | |
923 | i = (ino_t) (path ^ (path >> 32)); | |
924 | ||
925 | return i; | |
926 | } | |
927 | ||
928 | /** | |
929 | * v9fs_vfs_symlink - helper function to create symlinks | |
930 | * @dir: directory inode containing symlink | |
931 | * @dentry: dentry for symlink | |
932 | * @symname: symlink data | |
933 | * | |
934 | * See 9P2000.u RFC for more information | |
935 | * | |
936 | */ | |
937 | ||
938 | static int | |
939 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
940 | { | |
941 | int retval = -EPERM; | |
942 | struct v9fs_fid *newfid; | |
943 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
2bad8471 EVH |
944 | struct v9fs_fcall *fcall = NULL; |
945 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
946 | ||
947 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
948 | symname); | |
949 | ||
73c592b9 EVH |
950 | if (!mistat) |
951 | return -ENOMEM; | |
2bad8471 EVH |
952 | |
953 | if (!v9ses->extended) { | |
954 | dprintk(DEBUG_ERROR, "not extended\n"); | |
955 | goto FreeFcall; | |
956 | } | |
957 | ||
958 | /* issue a create */ | |
959 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); | |
960 | if (retval != 0) | |
961 | goto FreeFcall; | |
962 | ||
963 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
964 | ||
965 | /* issue a twstat */ | |
966 | v9fs_blank_mistat(v9ses, mistat); | |
967 | strcpy(mistat->data + 1, symname); | |
968 | mistat->extension = mistat->data + 1; | |
969 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
970 | if (retval < 0) { | |
971 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
972 | FCALL_ERROR(fcall)); | |
973 | goto FreeFcall; | |
974 | } | |
975 | ||
976 | kfree(fcall); | |
977 | ||
978 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
979 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
980 | FCALL_ERROR(fcall)); | |
981 | goto FreeFcall; | |
982 | } | |
983 | ||
984 | d_drop(dentry); /* FID - will this also clunk? */ | |
985 | ||
986 | FreeFcall: | |
987 | kfree(mistat); | |
988 | kfree(fcall); | |
989 | ||
990 | return retval; | |
991 | } | |
992 | ||
993 | /** | |
994 | * v9fs_readlink - read a symlink's location (internal version) | |
995 | * @dentry: dentry for symlink | |
73c592b9 | 996 | * @buffer: buffer to load symlink location into |
2bad8471 EVH |
997 | * @buflen: length of buffer |
998 | * | |
999 | */ | |
1000 | ||
1001 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) | |
1002 | { | |
1003 | int retval = -EPERM; | |
1004 | ||
1005 | struct v9fs_fcall *fcall = NULL; | |
1006 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
1007 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); | |
1008 | ||
1009 | if (!fid) { | |
1010 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); | |
1011 | retval = -EBADF; | |
1012 | goto FreeFcall; | |
1013 | } | |
1014 | ||
1015 | if (!v9ses->extended) { | |
1016 | retval = -EBADF; | |
1017 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1018 | goto FreeFcall; | |
1019 | } | |
1020 | ||
1021 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); | |
1022 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); | |
1023 | ||
1024 | if (retval < 0) { | |
1025 | dprintk(DEBUG_ERROR, "stat error\n"); | |
1026 | goto FreeFcall; | |
1027 | } | |
1028 | ||
1029 | if (!fcall) | |
1030 | return -EIO; | |
1031 | ||
1032 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { | |
1033 | retval = -EINVAL; | |
1034 | goto FreeFcall; | |
1035 | } | |
1036 | ||
1037 | /* copy extension buffer into buffer */ | |
1038 | if (strlen(fcall->params.rstat.stat->extension) < buflen) | |
1039 | buflen = strlen(fcall->params.rstat.stat->extension); | |
1040 | ||
1041 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); | |
1042 | ||
1043 | retval = buflen; | |
1044 | ||
1045 | FreeFcall: | |
1046 | kfree(fcall); | |
1047 | ||
1048 | return retval; | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * v9fs_vfs_readlink - read a symlink's location | |
1053 | * @dentry: dentry for symlink | |
1054 | * @buf: buffer to load symlink location into | |
1055 | * @buflen: length of buffer | |
1056 | * | |
1057 | */ | |
1058 | ||
1059 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, | |
1060 | int buflen) | |
1061 | { | |
1062 | int retval; | |
1063 | int ret; | |
1064 | char *link = __getname(); | |
1065 | ||
a1f9d8d2 LI |
1066 | if (buflen > PATH_MAX) |
1067 | buflen = PATH_MAX; | |
2bad8471 EVH |
1068 | |
1069 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); | |
1070 | ||
1071 | retval = v9fs_readlink(dentry, link, buflen); | |
1072 | ||
1073 | if (retval > 0) { | |
1074 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { | |
1075 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", | |
1076 | ret); | |
1077 | retval = ret; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | putname(link); | |
1082 | return retval; | |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * v9fs_vfs_follow_link - follow a symlink path | |
1087 | * @dentry: dentry for symlink | |
1088 | * @nd: nameidata | |
1089 | * | |
1090 | */ | |
1091 | ||
1092 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1093 | { | |
1094 | int len = 0; | |
1095 | char *link = __getname(); | |
1096 | ||
1097 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); | |
1098 | ||
1099 | if (!link) | |
1100 | link = ERR_PTR(-ENOMEM); | |
1101 | else { | |
1102 | len = v9fs_readlink(dentry, link, strlen(link)); | |
1103 | ||
1104 | if (len < 0) { | |
1105 | putname(link); | |
1106 | link = ERR_PTR(len); | |
1107 | } else | |
1108 | link[len] = 0; | |
1109 | } | |
1110 | nd_set_link(nd, link); | |
1111 | ||
1112 | return NULL; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * v9fs_vfs_put_link - release a symlink path | |
1117 | * @dentry: dentry for symlink | |
1118 | * @nd: nameidata | |
1119 | * | |
1120 | */ | |
1121 | ||
1122 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) | |
1123 | { | |
1124 | char *s = nd_get_link(nd); | |
1125 | ||
1126 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); | |
1127 | if (!IS_ERR(s)) | |
1128 | putname(s); | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * v9fs_vfs_link - create a hardlink | |
1133 | * @old_dentry: dentry for file to link to | |
1134 | * @dir: inode destination for new link | |
73c592b9 | 1135 | * @dentry: dentry for link |
2bad8471 EVH |
1136 | * |
1137 | */ | |
1138 | ||
1139 | /* XXX - lots of code dup'd from symlink and creates, | |
1140 | * figure out a better reuse strategy | |
1141 | */ | |
1142 | ||
1143 | static int | |
1144 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1145 | struct dentry *dentry) | |
1146 | { | |
1147 | int retval = -EPERM; | |
1148 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1149 | struct v9fs_fcall *fcall = NULL; | |
1150 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1151 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); | |
1152 | struct v9fs_fid *newfid = NULL; | |
1153 | char *symname = __getname(); | |
1154 | ||
1155 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, | |
1156 | old_dentry->d_name.name); | |
1157 | ||
1158 | if (!v9ses->extended) { | |
1159 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1160 | goto FreeMem; | |
1161 | } | |
1162 | ||
1163 | /* get fid of old_dentry */ | |
1164 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); | |
1165 | ||
1166 | /* issue a create */ | |
1167 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); | |
1168 | if (retval != 0) | |
1169 | goto FreeMem; | |
1170 | ||
1171 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1172 | if (!newfid) { | |
1173 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); | |
1174 | goto FreeMem; | |
1175 | } | |
1176 | ||
1177 | /* issue a twstat */ | |
1178 | v9fs_blank_mistat(v9ses, mistat); | |
1179 | strcpy(mistat->data + 1, symname); | |
1180 | mistat->extension = mistat->data + 1; | |
1181 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1182 | if (retval < 0) { | |
1183 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1184 | FCALL_ERROR(fcall)); | |
1185 | goto FreeMem; | |
1186 | } | |
1187 | ||
1188 | kfree(fcall); | |
1189 | ||
1190 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1191 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1192 | FCALL_ERROR(fcall)); | |
1193 | goto FreeMem; | |
1194 | } | |
1195 | ||
1196 | d_drop(dentry); /* FID - will this also clunk? */ | |
1197 | ||
1198 | kfree(fcall); | |
1199 | fcall = NULL; | |
1200 | ||
1201 | FreeMem: | |
1202 | kfree(mistat); | |
1203 | kfree(fcall); | |
1204 | putname(symname); | |
1205 | return retval; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * v9fs_vfs_mknod - create a special file | |
1210 | * @dir: inode destination for new link | |
1211 | * @dentry: dentry for file | |
1212 | * @mode: mode for creation | |
1213 | * @dev_t: device associated with special file | |
1214 | * | |
1215 | */ | |
1216 | ||
1217 | static int | |
1218 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
1219 | { | |
1220 | int retval = -EPERM; | |
1221 | struct v9fs_fid *newfid; | |
1222 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); | |
1223 | struct v9fs_fcall *fcall = NULL; | |
1224 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); | |
1225 | char *symname = __getname(); | |
1226 | ||
1227 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, | |
1228 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); | |
1229 | ||
73c592b9 EVH |
1230 | if (!mistat) |
1231 | return -ENOMEM; | |
1232 | ||
2bad8471 EVH |
1233 | if (!new_valid_dev(rdev)) { |
1234 | retval = -EINVAL; | |
1235 | goto FreeMem; | |
1236 | } | |
1237 | ||
1238 | if (!v9ses->extended) { | |
1239 | dprintk(DEBUG_ERROR, "not extended\n"); | |
1240 | goto FreeMem; | |
1241 | } | |
1242 | ||
1243 | /* issue a create */ | |
1244 | retval = v9fs_create(dir, dentry, mode, 0); | |
1245 | ||
1246 | if (retval != 0) | |
1247 | goto FreeMem; | |
1248 | ||
1249 | newfid = v9fs_fid_lookup(dentry, FID_OP); | |
1250 | if (!newfid) { | |
1251 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); | |
1252 | retval = -EINVAL; | |
1253 | goto FreeMem; | |
1254 | } | |
1255 | ||
1256 | /* build extension */ | |
1257 | if (S_ISBLK(mode)) | |
1258 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); | |
1259 | else if (S_ISCHR(mode)) | |
1260 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); | |
73c592b9 EVH |
1261 | else if (S_ISFIFO(mode)) |
1262 | ; /* DO NOTHING */ | |
2bad8471 EVH |
1263 | else { |
1264 | retval = -EINVAL; | |
1265 | goto FreeMem; | |
1266 | } | |
1267 | ||
1268 | if (!S_ISFIFO(mode)) { | |
1269 | /* issue a twstat */ | |
1270 | v9fs_blank_mistat(v9ses, mistat); | |
1271 | strcpy(mistat->data + 1, symname); | |
1272 | mistat->extension = mistat->data + 1; | |
1273 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); | |
1274 | if (retval < 0) { | |
1275 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", | |
1276 | FCALL_ERROR(fcall)); | |
1277 | goto FreeMem; | |
1278 | } | |
2bad8471 EVH |
1279 | } |
1280 | ||
1281 | /* need to update dcache so we show up */ | |
1282 | kfree(fcall); | |
1283 | ||
1284 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { | |
1285 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", | |
1286 | FCALL_ERROR(fcall)); | |
1287 | goto FreeMem; | |
1288 | } | |
1289 | ||
1290 | d_drop(dentry); /* FID - will this also clunk? */ | |
1291 | ||
1292 | FreeMem: | |
1293 | kfree(mistat); | |
1294 | kfree(fcall); | |
1295 | putname(symname); | |
1296 | ||
1297 | return retval; | |
1298 | } | |
1299 | ||
b501611a | 1300 | static struct inode_operations v9fs_dir_inode_operations_ext = { |
2bad8471 EVH |
1301 | .create = v9fs_vfs_create, |
1302 | .lookup = v9fs_vfs_lookup, | |
1303 | .symlink = v9fs_vfs_symlink, | |
1304 | .link = v9fs_vfs_link, | |
1305 | .unlink = v9fs_vfs_unlink, | |
1306 | .mkdir = v9fs_vfs_mkdir, | |
1307 | .rmdir = v9fs_vfs_rmdir, | |
1308 | .mknod = v9fs_vfs_mknod, | |
1309 | .rename = v9fs_vfs_rename, | |
1310 | .readlink = v9fs_vfs_readlink, | |
1311 | .getattr = v9fs_vfs_getattr, | |
1312 | .setattr = v9fs_vfs_setattr, | |
1313 | }; | |
1314 | ||
b501611a EVH |
1315 | static struct inode_operations v9fs_dir_inode_operations = { |
1316 | .create = v9fs_vfs_create, | |
1317 | .lookup = v9fs_vfs_lookup, | |
1318 | .unlink = v9fs_vfs_unlink, | |
1319 | .mkdir = v9fs_vfs_mkdir, | |
1320 | .rmdir = v9fs_vfs_rmdir, | |
1321 | .mknod = v9fs_vfs_mknod, | |
1322 | .rename = v9fs_vfs_rename, | |
1323 | .getattr = v9fs_vfs_getattr, | |
1324 | .setattr = v9fs_vfs_setattr, | |
1325 | }; | |
1326 | ||
2bad8471 EVH |
1327 | static struct inode_operations v9fs_file_inode_operations = { |
1328 | .getattr = v9fs_vfs_getattr, | |
1329 | .setattr = v9fs_vfs_setattr, | |
1330 | }; | |
1331 | ||
1332 | static struct inode_operations v9fs_symlink_inode_operations = { | |
1333 | .readlink = v9fs_vfs_readlink, | |
1334 | .follow_link = v9fs_vfs_follow_link, | |
1335 | .put_link = v9fs_vfs_put_link, | |
1336 | .getattr = v9fs_vfs_getattr, | |
1337 | .setattr = v9fs_vfs_setattr, | |
1338 | }; |