blob: 2b696ae6655a10306f5111c90f14a5af645c9220 [file] [log] [blame]
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001/*
2 * linux/fs/9p/vfs_inode.c
3 *
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07004 * This file contains vfs inode ops for the 9P2000 protocol.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07005 *
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
46static struct inode_operations v9fs_dir_inode_operations;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -070047static struct inode_operations v9fs_dir_inode_operations_ext;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070048static struct inode_operations v9fs_file_inode_operations;
49static 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
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070058static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070059{
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
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070096static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070097{
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
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700136static void
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700137v9fs_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
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700164 * @buf: unix metadata (stat) structure to populate
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700165 * @sb: superblock
166 *
167 */
168
169static void
170v9fs_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
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700181 buf->st_uid = (unsigned short)-1;
182 buf->st_gid = (unsigned short)-1;
183
184 if (v9ses && v9ses->extended) {
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700185 /* TODO: string to uid mapping via user-space daemon */
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700186 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
233struct inode *v9fs_get_inode(struct super_block *sb, int mode)
234{
235 struct inode *inode = NULL;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700236 struct v9fs_session_info *v9ses = sb->s_fs_info;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700237
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:
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700255 if(!v9ses->extended) {
256 dprintk(DEBUG_ERROR, "special files without extended mode\n");
257 return ERR_PTR(-EINVAL);
258 }
Eric Van Hensbergen5d58bec2005-09-09 13:04:27 -0700259 init_special_inode(inode, inode->i_mode,
260 inode->i_rdev);
261 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700262 case S_IFREG:
263 inode->i_op = &v9fs_file_inode_operations;
264 inode->i_fop = &v9fs_file_operations;
265 break;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700266 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;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700273 case S_IFDIR:
274 inode->i_nlink++;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700275 if(v9ses->extended)
276 inode->i_op = &v9fs_dir_inode_operations_ext;
277 else
278 inode->i_op = &v9fs_dir_inode_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700279 inode->i_fop = &v9fs_dir_operations;
280 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700281 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
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700298 * @open_mode: resulting open mode for file
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700299 *
300 */
301
302static int
303v9fs_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 =
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700310 v9fs_fid_lookup(file_dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700311 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;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700320 int wfidno = -1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700321
322 perm = unixmode2p9mode(v9ses, perm);
323
324 dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
325 file_dentry, perm, open_mode);
326
327 if (!dirfid)
328 return -EBADF;
329
330 dirfidnum = dirfid->fid;
331 if (dirfidnum < 0) {
332 dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
333 dir->i_ino);
334 return -EBADF;
335 }
336
337 if (file_dentry->d_inode) {
338 dprintk(DEBUG_ERROR,
339 "Odd. There is an inode for dir %lu, name :%s:\n",
340 dir->i_ino, file_dentry->d_name.name);
341 return -EEXIST;
342 }
343
344 newfid = v9fs_get_idpool(&v9ses->fidpool);
345 if (newfid < 0) {
346 eprintk(KERN_WARNING, "no free fids available\n");
347 return -ENOSPC;
348 }
349
350 result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
351 if (result < 0) {
352 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
353 v9fs_put_idpool(newfid, &v9ses->fidpool);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700354 newfid = -1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700355 goto CleanUpFid;
356 }
357
358 kfree(fcall);
359
360 result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
361 perm, open_mode, &fcall);
362 if (result < 0) {
363 dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
364 FCALL_ERROR(fcall), result);
365
366 goto CleanUpFid;
367 }
368
369 iounit = fcall->params.rcreate.iounit;
370 qid = fcall->params.rcreate.qid;
371 kfree(fcall);
372
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700373 fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
374 dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700375 if (!fid) {
376 result = -ENOMEM;
377 goto CleanUpFid;
378 }
379
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700380 fid->qid = qid;
381 fid->iounit = iounit;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700382
383 /* walk to the newly created file and put the fid in the dentry */
384 wfidno = v9fs_get_idpool(&v9ses->fidpool);
385 if (newfid < 0) {
386 eprintk(KERN_WARNING, "no free fids available\n");
387 return -ENOSPC;
388 }
389
390 result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
391 (char *) file_dentry->d_name.name, NULL);
392 if (result < 0) {
393 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
394 v9fs_put_idpool(wfidno, &v9ses->fidpool);
395 wfidno = -1;
396 goto CleanUpFid;
397 }
398
399 if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
400 if (!v9fs_t_clunk(v9ses, newfid, &fcall)) {
401 v9fs_put_idpool(wfidno, &v9ses->fidpool);
402 }
403
404 goto CleanUpFid;
405 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700406
407 if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
408 (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
409 (perm & V9FS_DMDEVICE))
410 return 0;
411
412 result = v9fs_t_stat(v9ses, newfid, &fcall);
413 if (result < 0) {
414 dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
415 result);
416 goto CleanUpFid;
417 }
418
419 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
420
421 file_inode = v9fs_get_inode(sb, newstat.st_mode);
422 if ((!file_inode) || IS_ERR(file_inode)) {
423 dprintk(DEBUG_ERROR, "create inode failed\n");
424 result = -EBADF;
425 goto CleanUpFid;
426 }
427
428 v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
429 kfree(fcall);
430 d_instantiate(file_dentry, file_inode);
431
432 if (perm & V9FS_DMDIR) {
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700433 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
434 v9fs_put_idpool(newfid, &v9ses->fidpool);
435 else
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700436 dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
437 FCALL_ERROR(fcall));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700438 kfree(fcall);
439 fid->fidopen = 0;
440 fid->fidcreate = 0;
441 d_drop(file_dentry);
442 }
443
444 return 0;
445
446 CleanUpFid:
447 kfree(fcall);
448
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700449 if (newfid >= 0) {
450 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
451 v9fs_put_idpool(newfid, &v9ses->fidpool);
452 else
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700453 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
454 FCALL_ERROR(fcall));
455
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700456 kfree(fcall);
457 }
458 if (wfidno >= 0) {
459 if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
460 v9fs_put_idpool(wfidno, &v9ses->fidpool);
461 else
462 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
463 FCALL_ERROR(fcall));
464
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700465 kfree(fcall);
466 }
467 return result;
468}
469
470/**
471 * v9fs_remove - helper function to remove files and directories
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700472 * @dir: directory inode that is being deleted
473 * @file: dentry that is being deleted
474 * @rmdir: removing a directory
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700475 *
476 */
477
478static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
479{
480 struct v9fs_fcall *fcall = NULL;
481 struct super_block *sb = NULL;
482 struct v9fs_session_info *v9ses = NULL;
483 struct v9fs_fid *v9fid = NULL;
484 struct inode *file_inode = NULL;
485 int fid = -1;
486 int result = 0;
487
488 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
489 rmdir);
490
491 file_inode = file->d_inode;
492 sb = file_inode->i_sb;
493 v9ses = v9fs_inode2v9ses(file_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700494 v9fid = v9fs_fid_lookup(file);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700495
496 if (!v9fid) {
497 dprintk(DEBUG_ERROR,
498 "no v9fs_fid\n");
499 return -EBADF;
500 }
501
502 fid = v9fid->fid;
503 if (fid < 0) {
504 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
505 file_inode->i_ino);
506 return -EBADF;
507 }
508
509 result = v9fs_t_remove(v9ses, fid, &fcall);
510 if (result < 0)
511 dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
512 FCALL_ERROR(fcall), result);
513 else {
514 v9fs_put_idpool(fid, &v9ses->fidpool);
515 v9fs_fid_destroy(v9fid);
516 }
517
518 kfree(fcall);
519 return result;
520}
521
522/**
523 * v9fs_vfs_create - VFS hook to create files
524 * @inode: directory inode that is being deleted
525 * @dentry: dentry that is being deleted
526 * @perm: create permissions
527 * @nd: path information
528 *
529 */
530
531static int
532v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
533 struct nameidata *nd)
534{
535 return v9fs_create(inode, dentry, perm, O_RDWR);
536}
537
538/**
539 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700540 * @inode: inode that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700541 * @dentry: dentry that is being unlinked
542 * @mode: mode for new directory
543 *
544 */
545
546static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
547{
548 return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
549}
550
551/**
552 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
553 * @dir: inode that is being walked from
554 * @dentry: dentry that is being walked to?
555 * @nameidata: path data
556 *
557 */
558
559static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
560 struct nameidata *nameidata)
561{
562 struct super_block *sb;
563 struct v9fs_session_info *v9ses;
564 struct v9fs_fid *dirfid;
565 struct v9fs_fid *fid;
566 struct inode *inode;
567 struct v9fs_fcall *fcall = NULL;
568 struct stat newstat;
569 int dirfidnum = -1;
570 int newfid = -1;
571 int result = 0;
572
573 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
574 dir, dentry->d_iname, dentry, nameidata);
575
576 sb = dir->i_sb;
577 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700578 dirfid = v9fs_fid_lookup(dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700579
580 if (!dirfid) {
581 dprintk(DEBUG_ERROR, "no dirfid\n");
582 return ERR_PTR(-EINVAL);
583 }
584
585 dirfidnum = dirfid->fid;
586
587 if (dirfidnum < 0) {
588 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
589 dir, dir->i_ino);
590 return ERR_PTR(-EBADF);
591 }
592
593 newfid = v9fs_get_idpool(&v9ses->fidpool);
594 if (newfid < 0) {
595 eprintk(KERN_WARNING, "newfid fails!\n");
596 return ERR_PTR(-ENOSPC);
597 }
598
599 result =
600 v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
601 NULL);
602 if (result < 0) {
603 v9fs_put_idpool(newfid, &v9ses->fidpool);
604 if (result == -ENOENT) {
605 d_add(dentry, NULL);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700606 dprintk(DEBUG_VFS,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700607 "Return negative dentry %p count %d\n",
608 dentry, atomic_read(&dentry->d_count));
609 return NULL;
610 }
611 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
612 goto FreeFcall;
613 }
614
615 result = v9fs_t_stat(v9ses, newfid, &fcall);
616 if (result < 0) {
617 dprintk(DEBUG_ERROR, "stat error\n");
618 goto FreeFcall;
619 }
620
621 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
622 inode = v9fs_get_inode(sb, newstat.st_mode);
623
624 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
625 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
626 PTR_ERR(inode));
627
628 result = -ENOSPC;
629 goto FreeFcall;
630 }
631
632 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
633
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700634 fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700635 if (fid == NULL) {
636 dprintk(DEBUG_ERROR, "couldn't insert\n");
637 result = -ENOMEM;
638 goto FreeFcall;
639 }
640
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700641 fid->qid = fcall->params.rstat.stat->qid;
642
643 dentry->d_op = &v9fs_dentry_operations;
644 v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
645
646 d_add(dentry, inode);
647 kfree(fcall);
648
649 return NULL;
650
651 FreeFcall:
652 kfree(fcall);
653 return ERR_PTR(result);
654}
655
656/**
657 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
658 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700659 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700660 *
661 */
662
663static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
664{
665 return v9fs_remove(i, d, 0);
666}
667
668/**
669 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
670 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700671 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700672 *
673 */
674
675static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
676{
677 return v9fs_remove(i, d, 1);
678}
679
680/**
681 * v9fs_vfs_rename - VFS hook to rename an inode
682 * @old_dir: old dir inode
683 * @old_dentry: old dentry
684 * @new_dir: new dir inode
685 * @new_dentry: new dentry
686 *
687 */
688
689static int
690v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
691 struct inode *new_dir, struct dentry *new_dentry)
692{
693 struct inode *old_inode = old_dentry->d_inode;
694 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700695 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700696 struct v9fs_fid *olddirfid =
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700697 v9fs_fid_lookup(old_dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700698 struct v9fs_fid *newdirfid =
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700699 v9fs_fid_lookup(new_dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700700 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
701 struct v9fs_fcall *fcall = NULL;
702 int fid = -1;
703 int olddirfidnum = -1;
704 int newdirfidnum = -1;
705 int retval = 0;
706
707 dprintk(DEBUG_VFS, "\n");
708
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700709 if (!mistat)
710 return -ENOMEM;
711
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700712 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
713 dprintk(DEBUG_ERROR, "problem with arguments\n");
714 return -EBADF;
715 }
716
717 /* 9P can only handle file rename in the same directory */
718 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
719 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
720 retval = -EPERM;
721 goto FreeFcallnBail;
722 }
723
724 fid = oldfid->fid;
725 olddirfidnum = olddirfid->fid;
726 newdirfidnum = newdirfid->fid;
727
728 if (fid < 0) {
729 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
730 old_inode->i_ino);
731 retval = -EBADF;
732 goto FreeFcallnBail;
733 }
734
735 v9fs_blank_mistat(v9ses, mistat);
736
737 strcpy(mistat->data + 1, v9ses->name);
738 mistat->name = mistat->data + 1 + strlen(v9ses->name);
739
740 if (new_dentry->d_name.len >
741 (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
742 dprintk(DEBUG_ERROR, "new name too long\n");
743 goto FreeFcallnBail;
744 }
745
746 strcpy(mistat->name, new_dentry->d_name.name);
747 retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
748
749 FreeFcallnBail:
750 kfree(mistat);
751
752 if (retval < 0)
753 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
754 FCALL_ERROR(fcall));
755
756 kfree(fcall);
757 return retval;
758}
759
760/**
761 * v9fs_vfs_getattr - retreive file metadata
762 * @mnt - mount information
763 * @dentry - file to get attributes on
764 * @stat - metadata structure to populate
765 *
766 */
767
768static int
769v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
770 struct kstat *stat)
771{
772 struct v9fs_fcall *fcall = NULL;
773 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700774 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700775 int err = -EPERM;
776
777 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
778 if (!fid) {
779 dprintk(DEBUG_ERROR,
780 "couldn't find fid associated with dentry\n");
781 return -EBADF;
782 }
783
784 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
785
786 if (err < 0)
787 dprintk(DEBUG_ERROR, "stat error\n");
788 else {
789 v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
790 dentry->d_inode->i_sb);
791 generic_fillattr(dentry->d_inode, stat);
792 }
793
794 kfree(fcall);
795 return err;
796}
797
798/**
799 * v9fs_vfs_setattr - set file metadata
800 * @dentry: file whose metadata to set
801 * @iattr: metadata assignment structure
802 *
803 */
804
805static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
806{
807 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700808 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700809 struct v9fs_fcall *fcall = NULL;
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700810 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700811 int res = -EPERM;
812
813 dprintk(DEBUG_VFS, "\n");
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700814
815 if (!mistat)
816 return -ENOMEM;
817
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700818 if (!fid) {
819 dprintk(DEBUG_ERROR,
820 "Couldn't find fid associated with dentry\n");
821 return -EBADF;
822 }
823
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700824 v9fs_blank_mistat(v9ses, mistat);
825 if (iattr->ia_valid & ATTR_MODE)
826 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
827
828 if (iattr->ia_valid & ATTR_MTIME)
829 mistat->mtime = iattr->ia_mtime.tv_sec;
830
831 if (iattr->ia_valid & ATTR_ATIME)
832 mistat->atime = iattr->ia_atime.tv_sec;
833
834 if (iattr->ia_valid & ATTR_SIZE)
835 mistat->length = iattr->ia_size;
836
837 if (v9ses->extended) {
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700838 char *ptr = mistat->data+1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700839
840 if (iattr->ia_valid & ATTR_UID) {
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700841 mistat->uid = ptr;
842 ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700843 mistat->n_uid = iattr->ia_uid;
844 }
845
846 if (iattr->ia_valid & ATTR_GID) {
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700847 mistat->gid = ptr;
848 ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700849 mistat->n_gid = iattr->ia_gid;
850 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700851 }
852
853 res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
854
855 if (res < 0)
856 dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
857
858 kfree(mistat);
859 kfree(fcall);
860
861 if (res >= 0)
862 res = inode_setattr(dentry->d_inode, iattr);
863
864 return res;
865}
866
867/**
868 * v9fs_mistat2inode - populate an inode structure with mistat info
869 * @mistat: Plan 9 metadata (mistat) structure
870 * @inode: inode to populate
871 * @sb: superblock of filesystem
872 *
873 */
874
875void
876v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
877 struct super_block *sb)
878{
879 struct v9fs_session_info *v9ses = sb->s_fs_info;
880
881 inode->i_nlink = 1;
882
883 inode->i_atime.tv_sec = mistat->atime;
884 inode->i_mtime.tv_sec = mistat->mtime;
885 inode->i_ctime.tv_sec = mistat->mtime;
886
887 inode->i_uid = -1;
888 inode->i_gid = -1;
889
890 if (v9ses->extended) {
891 /* TODO: string to uid mapping via user-space daemon */
892 inode->i_uid = mistat->n_uid;
893 inode->i_gid = mistat->n_gid;
894
895 if (mistat->n_uid == -1)
896 sscanf(mistat->uid, "%x", &inode->i_uid);
897
898 if (mistat->n_gid == -1)
899 sscanf(mistat->gid, "%x", &inode->i_gid);
900 }
901
902 if (inode->i_uid == -1)
903 inode->i_uid = v9ses->uid;
904 if (inode->i_gid == -1)
905 inode->i_gid = v9ses->gid;
906
907 inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
908 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
909 char type = 0;
910 int major = -1;
911 int minor = -1;
912 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
913 switch (type) {
914 case 'c':
915 inode->i_mode &= ~S_IFBLK;
916 inode->i_mode |= S_IFCHR;
917 break;
918 case 'b':
919 break;
920 default:
921 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
922 type, mistat->extension);
923 };
924 inode->i_rdev = MKDEV(major, minor);
925 } else
926 inode->i_rdev = 0;
927
928 inode->i_size = mistat->length;
929
930 inode->i_blksize = sb->s_blocksize;
931 inode->i_blocks =
932 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
933}
934
935/**
936 * v9fs_qid2ino - convert qid into inode number
937 * @qid: qid to hash
938 *
939 * BUG: potential for inode number collisions?
940 */
941
942ino_t v9fs_qid2ino(struct v9fs_qid *qid)
943{
944 u64 path = qid->path + 2;
945 ino_t i = 0;
946
947 if (sizeof(ino_t) == sizeof(path))
948 memcpy(&i, &path, sizeof(ino_t));
949 else
950 i = (ino_t) (path ^ (path >> 32));
951
952 return i;
953}
954
955/**
956 * v9fs_vfs_symlink - helper function to create symlinks
957 * @dir: directory inode containing symlink
958 * @dentry: dentry for symlink
959 * @symname: symlink data
960 *
961 * See 9P2000.u RFC for more information
962 *
963 */
964
965static int
966v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
967{
968 int retval = -EPERM;
969 struct v9fs_fid *newfid;
970 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700971 struct v9fs_fcall *fcall = NULL;
972 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
973
974 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
975 symname);
976
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700977 if (!mistat)
978 return -ENOMEM;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700979
980 if (!v9ses->extended) {
981 dprintk(DEBUG_ERROR, "not extended\n");
982 goto FreeFcall;
983 }
984
985 /* issue a create */
986 retval = v9fs_create(dir, dentry, S_IFLNK, 0);
987 if (retval != 0)
988 goto FreeFcall;
989
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700990 newfid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700991
992 /* issue a twstat */
993 v9fs_blank_mistat(v9ses, mistat);
994 strcpy(mistat->data + 1, symname);
995 mistat->extension = mistat->data + 1;
996 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
997 if (retval < 0) {
998 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
999 FCALL_ERROR(fcall));
1000 goto FreeFcall;
1001 }
1002
1003 kfree(fcall);
1004
1005 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1006 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1007 FCALL_ERROR(fcall));
1008 goto FreeFcall;
1009 }
1010
1011 d_drop(dentry); /* FID - will this also clunk? */
1012
1013 FreeFcall:
1014 kfree(mistat);
1015 kfree(fcall);
1016
1017 return retval;
1018}
1019
1020/**
1021 * v9fs_readlink - read a symlink's location (internal version)
1022 * @dentry: dentry for symlink
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001023 * @buffer: buffer to load symlink location into
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001024 * @buflen: length of buffer
1025 *
1026 */
1027
1028static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1029{
1030 int retval = -EPERM;
1031
1032 struct v9fs_fcall *fcall = NULL;
1033 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -07001034 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001035
1036 if (!fid) {
1037 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1038 retval = -EBADF;
1039 goto FreeFcall;
1040 }
1041
1042 if (!v9ses->extended) {
1043 retval = -EBADF;
1044 dprintk(DEBUG_ERROR, "not extended\n");
1045 goto FreeFcall;
1046 }
1047
1048 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1049 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1050
1051 if (retval < 0) {
1052 dprintk(DEBUG_ERROR, "stat error\n");
1053 goto FreeFcall;
1054 }
1055
1056 if (!fcall)
1057 return -EIO;
1058
1059 if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
1060 retval = -EINVAL;
1061 goto FreeFcall;
1062 }
1063
1064 /* copy extension buffer into buffer */
1065 if (strlen(fcall->params.rstat.stat->extension) < buflen)
1066 buflen = strlen(fcall->params.rstat.stat->extension);
1067
1068 memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
1069
1070 retval = buflen;
1071
1072 FreeFcall:
1073 kfree(fcall);
1074
1075 return retval;
1076}
1077
1078/**
1079 * v9fs_vfs_readlink - read a symlink's location
1080 * @dentry: dentry for symlink
1081 * @buf: buffer to load symlink location into
1082 * @buflen: length of buffer
1083 *
1084 */
1085
1086static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1087 int buflen)
1088{
1089 int retval;
1090 int ret;
1091 char *link = __getname();
1092
Latchesar Ionkova1f9d8d2005-09-22 21:43:52 -07001093 if (buflen > PATH_MAX)
1094 buflen = PATH_MAX;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001095
1096 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1097
1098 retval = v9fs_readlink(dentry, link, buflen);
1099
1100 if (retval > 0) {
1101 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1102 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1103 ret);
1104 retval = ret;
1105 }
1106 }
1107
1108 putname(link);
1109 return retval;
1110}
1111
1112/**
1113 * v9fs_vfs_follow_link - follow a symlink path
1114 * @dentry: dentry for symlink
1115 * @nd: nameidata
1116 *
1117 */
1118
1119static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1120{
1121 int len = 0;
1122 char *link = __getname();
1123
1124 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1125
1126 if (!link)
1127 link = ERR_PTR(-ENOMEM);
1128 else {
1129 len = v9fs_readlink(dentry, link, strlen(link));
1130
1131 if (len < 0) {
1132 putname(link);
1133 link = ERR_PTR(len);
1134 } else
1135 link[len] = 0;
1136 }
1137 nd_set_link(nd, link);
1138
1139 return NULL;
1140}
1141
1142/**
1143 * v9fs_vfs_put_link - release a symlink path
1144 * @dentry: dentry for symlink
1145 * @nd: nameidata
1146 *
1147 */
1148
1149static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1150{
1151 char *s = nd_get_link(nd);
1152
1153 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1154 if (!IS_ERR(s))
1155 putname(s);
1156}
1157
1158/**
1159 * v9fs_vfs_link - create a hardlink
1160 * @old_dentry: dentry for file to link to
1161 * @dir: inode destination for new link
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001162 * @dentry: dentry for link
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001163 *
1164 */
1165
1166/* XXX - lots of code dup'd from symlink and creates,
1167 * figure out a better reuse strategy
1168 */
1169
1170static int
1171v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1172 struct dentry *dentry)
1173{
1174 int retval = -EPERM;
1175 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1176 struct v9fs_fcall *fcall = NULL;
1177 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -07001178 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001179 struct v9fs_fid *newfid = NULL;
1180 char *symname = __getname();
1181
1182 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1183 old_dentry->d_name.name);
1184
1185 if (!v9ses->extended) {
1186 dprintk(DEBUG_ERROR, "not extended\n");
1187 goto FreeMem;
1188 }
1189
1190 /* get fid of old_dentry */
1191 sprintf(symname, "hardlink(%d)\n", oldfid->fid);
1192
1193 /* issue a create */
1194 retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
1195 if (retval != 0)
1196 goto FreeMem;
1197
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -07001198 newfid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001199 if (!newfid) {
1200 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
1201 goto FreeMem;
1202 }
1203
1204 /* issue a twstat */
1205 v9fs_blank_mistat(v9ses, mistat);
1206 strcpy(mistat->data + 1, symname);
1207 mistat->extension = mistat->data + 1;
1208 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1209 if (retval < 0) {
1210 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1211 FCALL_ERROR(fcall));
1212 goto FreeMem;
1213 }
1214
1215 kfree(fcall);
1216
1217 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1218 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1219 FCALL_ERROR(fcall));
1220 goto FreeMem;
1221 }
1222
1223 d_drop(dentry); /* FID - will this also clunk? */
1224
1225 kfree(fcall);
1226 fcall = NULL;
1227
1228 FreeMem:
1229 kfree(mistat);
1230 kfree(fcall);
1231 putname(symname);
1232 return retval;
1233}
1234
1235/**
1236 * v9fs_vfs_mknod - create a special file
1237 * @dir: inode destination for new link
1238 * @dentry: dentry for file
1239 * @mode: mode for creation
1240 * @dev_t: device associated with special file
1241 *
1242 */
1243
1244static int
1245v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1246{
1247 int retval = -EPERM;
1248 struct v9fs_fid *newfid;
1249 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1250 struct v9fs_fcall *fcall = NULL;
1251 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1252 char *symname = __getname();
1253
1254 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1255 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1256
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001257 if (!mistat)
1258 return -ENOMEM;
1259
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001260 if (!new_valid_dev(rdev)) {
1261 retval = -EINVAL;
1262 goto FreeMem;
1263 }
1264
1265 if (!v9ses->extended) {
1266 dprintk(DEBUG_ERROR, "not extended\n");
1267 goto FreeMem;
1268 }
1269
1270 /* issue a create */
1271 retval = v9fs_create(dir, dentry, mode, 0);
1272
1273 if (retval != 0)
1274 goto FreeMem;
1275
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -07001276 newfid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001277 if (!newfid) {
1278 dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
1279 retval = -EINVAL;
1280 goto FreeMem;
1281 }
1282
1283 /* build extension */
1284 if (S_ISBLK(mode))
1285 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
1286 else if (S_ISCHR(mode))
1287 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001288 else if (S_ISFIFO(mode))
1289 ; /* DO NOTHING */
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001290 else {
1291 retval = -EINVAL;
1292 goto FreeMem;
1293 }
1294
1295 if (!S_ISFIFO(mode)) {
1296 /* issue a twstat */
1297 v9fs_blank_mistat(v9ses, mistat);
1298 strcpy(mistat->data + 1, symname);
1299 mistat->extension = mistat->data + 1;
1300 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1301 if (retval < 0) {
1302 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1303 FCALL_ERROR(fcall));
1304 goto FreeMem;
1305 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001306 }
1307
1308 /* need to update dcache so we show up */
1309 kfree(fcall);
1310
1311 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1312 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1313 FCALL_ERROR(fcall));
1314 goto FreeMem;
1315 }
1316
1317 d_drop(dentry); /* FID - will this also clunk? */
1318
1319 FreeMem:
1320 kfree(mistat);
1321 kfree(fcall);
1322 putname(symname);
1323
1324 return retval;
1325}
1326
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001327static struct inode_operations v9fs_dir_inode_operations_ext = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001328 .create = v9fs_vfs_create,
1329 .lookup = v9fs_vfs_lookup,
1330 .symlink = v9fs_vfs_symlink,
1331 .link = v9fs_vfs_link,
1332 .unlink = v9fs_vfs_unlink,
1333 .mkdir = v9fs_vfs_mkdir,
1334 .rmdir = v9fs_vfs_rmdir,
1335 .mknod = v9fs_vfs_mknod,
1336 .rename = v9fs_vfs_rename,
1337 .readlink = v9fs_vfs_readlink,
1338 .getattr = v9fs_vfs_getattr,
1339 .setattr = v9fs_vfs_setattr,
1340};
1341
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001342static struct inode_operations v9fs_dir_inode_operations = {
1343 .create = v9fs_vfs_create,
1344 .lookup = v9fs_vfs_lookup,
1345 .unlink = v9fs_vfs_unlink,
1346 .mkdir = v9fs_vfs_mkdir,
1347 .rmdir = v9fs_vfs_rmdir,
1348 .mknod = v9fs_vfs_mknod,
1349 .rename = v9fs_vfs_rename,
1350 .getattr = v9fs_vfs_getattr,
1351 .setattr = v9fs_vfs_setattr,
1352};
1353
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001354static struct inode_operations v9fs_file_inode_operations = {
1355 .getattr = v9fs_vfs_getattr,
1356 .setattr = v9fs_vfs_setattr,
1357};
1358
1359static struct inode_operations v9fs_symlink_inode_operations = {
1360 .readlink = v9fs_vfs_readlink,
1361 .follow_link = v9fs_vfs_follow_link,
1362 .put_link = v9fs_vfs_put_link,
1363 .getattr = v9fs_vfs_getattr,
1364 .setattr = v9fs_vfs_setattr,
1365};