blob: 378767c07bf11f746d1387e11dcebc087912adbd [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
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070012 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/smp_lock.h>
34#include <linux/inet.h>
35#include <linux/namei.h>
36#include <linux/idr.h>
37
38#include "debug.h"
39#include "v9fs.h"
40#include "9p.h"
41#include "v9fs_vfs.h"
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070042#include "fid.h"
43
44static struct inode_operations v9fs_dir_inode_operations;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -070045static struct inode_operations v9fs_dir_inode_operations_ext;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070046static struct inode_operations v9fs_file_inode_operations;
47static struct inode_operations v9fs_symlink_inode_operations;
48
49/**
50 * unixmode2p9mode - convert unix mode bits to plan 9
51 * @v9ses: v9fs session information
52 * @mode: mode to convert
53 *
54 */
55
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070056static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070057{
58 int res;
59 res = mode & 0777;
60 if (S_ISDIR(mode))
61 res |= V9FS_DMDIR;
62 if (v9ses->extended) {
63 if (S_ISLNK(mode))
64 res |= V9FS_DMSYMLINK;
65 if (v9ses->nodev == 0) {
66 if (S_ISSOCK(mode))
67 res |= V9FS_DMSOCKET;
68 if (S_ISFIFO(mode))
69 res |= V9FS_DMNAMEDPIPE;
70 if (S_ISBLK(mode))
71 res |= V9FS_DMDEVICE;
72 if (S_ISCHR(mode))
73 res |= V9FS_DMDEVICE;
74 }
75
76 if ((mode & S_ISUID) == S_ISUID)
77 res |= V9FS_DMSETUID;
78 if ((mode & S_ISGID) == S_ISGID)
79 res |= V9FS_DMSETGID;
80 if ((mode & V9FS_DMLINK))
81 res |= V9FS_DMLINK;
82 }
83
84 return res;
85}
86
87/**
88 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
89 * @v9ses: v9fs session information
90 * @mode: mode to convert
91 *
92 */
93
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070094static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070095{
96 int res;
97
98 res = mode & 0777;
99
100 if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
101 res |= S_IFDIR;
102 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
103 res |= S_IFLNK;
104 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
105 && (v9ses->nodev == 0))
106 res |= S_IFSOCK;
107 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
108 && (v9ses->nodev == 0))
109 res |= S_IFIFO;
110 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
111 && (v9ses->nodev == 0))
112 res |= S_IFBLK;
113 else
114 res |= S_IFREG;
115
116 if (v9ses->extended) {
117 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
118 res |= S_ISUID;
119
120 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
121 res |= S_ISGID;
122 }
123
124 return res;
125}
126
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800127int v9fs_uflags2omode(int uflags)
128{
129 int ret;
130
131 ret = 0;
132 switch (uflags&3) {
133 default:
134 case O_RDONLY:
135 ret = V9FS_OREAD;
136 break;
137
138 case O_WRONLY:
139 ret = V9FS_OWRITE;
140 break;
141
142 case O_RDWR:
143 ret = V9FS_ORDWR;
144 break;
145 }
146
147 if (uflags & O_EXCL)
148 ret |= V9FS_OEXCL;
149
150 if (uflags & O_TRUNC)
151 ret |= V9FS_OTRUNC;
152
153 if (uflags & O_APPEND)
154 ret |= V9FS_OAPPEND;
155
156 return ret;
157}
158
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700159/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800160 * v9fs_blank_wstat - helper function to setup a 9P stat structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700161 * @v9ses: 9P session info (for determining extended mode)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800162 * @wstat: structure to initialize
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700163 *
164 */
165
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700166static void
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800167v9fs_blank_wstat(struct v9fs_wstat *wstat)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700168{
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800169 wstat->type = ~0;
170 wstat->dev = ~0;
171 wstat->qid.type = ~0;
172 wstat->qid.version = ~0;
173 *((long long *)&wstat->qid.path) = ~0;
174 wstat->mode = ~0;
175 wstat->atime = ~0;
176 wstat->mtime = ~0;
177 wstat->length = ~0;
178 wstat->name = NULL;
179 wstat->uid = NULL;
180 wstat->gid = NULL;
181 wstat->muid = NULL;
182 wstat->n_uid = ~0;
183 wstat->n_gid = ~0;
184 wstat->n_muid = ~0;
185 wstat->extension = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700186}
187
188/**
189 * v9fs_get_inode - helper function to setup an inode
190 * @sb: superblock
191 * @mode: mode to setup inode with
192 *
193 */
194
195struct inode *v9fs_get_inode(struct super_block *sb, int mode)
196{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800197 struct inode *inode;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700198 struct v9fs_session_info *v9ses = sb->s_fs_info;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700199
200 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
201
202 inode = new_inode(sb);
203 if (inode) {
204 inode->i_mode = mode;
205 inode->i_uid = current->fsuid;
206 inode->i_gid = current->fsgid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700207 inode->i_blocks = 0;
208 inode->i_rdev = 0;
209 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Eric Van Hensbergen147b31c2006-01-18 17:43:02 -0800210 inode->i_mapping->a_ops = &v9fs_addr_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700211
212 switch (mode & S_IFMT) {
213 case S_IFIFO:
214 case S_IFBLK:
215 case S_IFCHR:
216 case S_IFSOCK:
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700217 if(!v9ses->extended) {
218 dprintk(DEBUG_ERROR, "special files without extended mode\n");
219 return ERR_PTR(-EINVAL);
220 }
Eric Van Hensbergen5d58bec2005-09-09 13:04:27 -0700221 init_special_inode(inode, inode->i_mode,
222 inode->i_rdev);
223 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700224 case S_IFREG:
225 inode->i_op = &v9fs_file_inode_operations;
226 inode->i_fop = &v9fs_file_operations;
227 break;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700228 case S_IFLNK:
229 if(!v9ses->extended) {
230 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
231 return ERR_PTR(-EINVAL);
232 }
233 inode->i_op = &v9fs_symlink_inode_operations;
234 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700235 case S_IFDIR:
Dave Hansend8c76e62006-09-30 23:29:04 -0700236 inc_nlink(inode);
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700237 if(v9ses->extended)
238 inode->i_op = &v9fs_dir_inode_operations_ext;
239 else
240 inode->i_op = &v9fs_dir_inode_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700241 inode->i_fop = &v9fs_dir_operations;
242 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700243 default:
244 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
245 mode, mode & S_IFMT);
246 return ERR_PTR(-EINVAL);
247 }
248 } else {
249 eprintk(KERN_WARNING, "Problem allocating inode\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 return inode;
253}
254
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700255static int
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800256v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
257 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700258{
Mika Kukkonen736c4b82006-12-06 20:36:29 -0800259 int fid;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800260 int err;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800261 struct v9fs_fcall *fcall;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700262
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800263 fid = v9fs_get_idpool(&v9ses->fidpool);
264 if (fid < 0) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700265 eprintk(KERN_WARNING, "no free fids available\n");
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800266 return -ENOSPC;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700267 }
268
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800269 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
270 if (err < 0) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800271 PRINT_FCALL_ERROR("clone error", fcall);
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700272 if (fcall && fcall->id == RWALK)
273 goto clunk_fid;
274 else
275 goto put_fid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700276 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700277 kfree(fcall);
278
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800279 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800280 if (err < 0) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800281 PRINT_FCALL_ERROR("create fails", fcall);
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800282 goto clunk_fid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700283 }
284
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800285 if (iounit)
286 *iounit = fcall->params.rcreate.iounit;
287
288 if (qid)
289 *qid = fcall->params.rcreate.qid;
290
291 if (fidp)
292 *fidp = fid;
293
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700294 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700295 return 0;
296
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800297clunk_fid:
298 v9fs_t_clunk(v9ses, fid);
299 fid = V9FS_NOFID;
300
301put_fid:
Latchesar Ionkov9d7fa402006-06-28 04:26:51 -0700302 if (fid != V9FS_NOFID)
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800303 v9fs_put_idpool(fid, &v9ses->fidpool);
304
305 kfree(fcall);
306 return err;
307}
308
309static struct v9fs_fid*
310v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
311{
312 int err;
Mika Kukkonen736c4b82006-12-06 20:36:29 -0800313 int nfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800314 struct v9fs_fid *ret;
315 struct v9fs_fcall *fcall;
316
317 nfid = v9fs_get_idpool(&v9ses->fidpool);
318 if (nfid < 0) {
319 eprintk(KERN_WARNING, "no free fids available\n");
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800320 return ERR_PTR(-ENOSPC);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800321 }
322
323 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
324 &fcall);
325
326 if (err < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700327 if (fcall && fcall->id == RWALK)
328 goto clunk_fid;
329
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800330 PRINT_FCALL_ERROR("walk error", fcall);
331 v9fs_put_idpool(nfid, &v9ses->fidpool);
332 goto error;
333 }
334
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700335 kfree(fcall);
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800336 fcall = NULL;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800337 ret = v9fs_fid_create(v9ses, nfid);
338 if (!ret) {
339 err = -ENOMEM;
340 goto clunk_fid;
341 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700342
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800343 err = v9fs_fid_insert(ret, dentry);
344 if (err < 0) {
345 v9fs_fid_destroy(ret);
346 goto clunk_fid;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700347 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800348
349 return ret;
350
351clunk_fid:
352 v9fs_t_clunk(v9ses, nfid);
353
354error:
355 kfree(fcall);
356 return ERR_PTR(err);
357}
358
Latchesar Ionkov5174fda2006-03-25 03:07:25 -0800359static struct inode *
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800360v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
361 struct super_block *sb)
362{
363 int err, umode;
364 struct inode *ret;
365 struct v9fs_fcall *fcall;
366
367 ret = NULL;
368 err = v9fs_t_stat(v9ses, fid, &fcall);
369 if (err) {
370 PRINT_FCALL_ERROR("stat error", fcall);
371 goto error;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700372 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800373
374 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
375 ret = v9fs_get_inode(sb, umode);
376 if (IS_ERR(ret)) {
377 err = PTR_ERR(ret);
378 ret = NULL;
379 goto error;
380 }
381
382 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
383 kfree(fcall);
384 return ret;
385
386error:
387 kfree(fcall);
388 if (ret)
389 iput(ret);
390
391 return ERR_PTR(err);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700392}
393
394/**
395 * v9fs_remove - helper function to remove files and directories
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700396 * @dir: directory inode that is being deleted
397 * @file: dentry that is being deleted
398 * @rmdir: removing a directory
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700399 *
400 */
401
402static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
403{
404 struct v9fs_fcall *fcall = NULL;
405 struct super_block *sb = NULL;
406 struct v9fs_session_info *v9ses = NULL;
407 struct v9fs_fid *v9fid = NULL;
408 struct inode *file_inode = NULL;
409 int fid = -1;
410 int result = 0;
411
412 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
413 rmdir);
414
415 file_inode = file->d_inode;
416 sb = file_inode->i_sb;
417 v9ses = v9fs_inode2v9ses(file_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700418 v9fid = v9fs_fid_lookup(file);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800419 if(IS_ERR(v9fid))
420 return PTR_ERR(v9fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700421
422 fid = v9fid->fid;
423 if (fid < 0) {
424 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
425 file_inode->i_ino);
426 return -EBADF;
427 }
428
429 result = v9fs_t_remove(v9ses, fid, &fcall);
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800430 if (result < 0) {
431 PRINT_FCALL_ERROR("remove fails", fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800432 goto Error;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700433 }
434
Eric Van Hensbergen834a9b82006-07-30 03:04:16 -0700435 v9fs_put_idpool(fid, &v9ses->fidpool);
436 v9fs_fid_destroy(v9fid);
437
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800438Error:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700439 kfree(fcall);
440 return result;
441}
442
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800443static int
444v9fs_open_created(struct inode *inode, struct file *file)
445{
446 return 0;
447}
448
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700449/**
450 * v9fs_vfs_create - VFS hook to create files
451 * @inode: directory inode that is being deleted
452 * @dentry: dentry that is being deleted
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800453 * @mode: create permissions
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700454 * @nd: path information
455 *
456 */
457
458static int
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800459v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700460 struct nameidata *nd)
461{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800462 int err;
463 u32 fid, perm, iounit;
464 int flags;
465 struct v9fs_session_info *v9ses;
466 struct v9fs_fid *dfid, *vfid, *ffid;
467 struct inode *inode;
468 struct v9fs_qid qid;
469 struct file *filp;
470
471 inode = NULL;
472 vfid = NULL;
473 v9ses = v9fs_inode2v9ses(dir);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800474 dfid = v9fs_fid_clone(dentry->d_parent);
475 if(IS_ERR(dfid)) {
476 err = PTR_ERR(dfid);
477 goto error;
478 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800479
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800480 perm = unixmode2p9mode(v9ses, mode);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800481 if (nd && nd->flags & LOOKUP_OPEN)
482 flags = nd->intent.open.flags - 1;
483 else
484 flags = O_RDWR;
485
486 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800487 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800488
489 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800490 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800491
492 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800493 v9fs_fid_clunk(v9ses, dfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800494 if (IS_ERR(vfid)) {
495 err = PTR_ERR(vfid);
496 vfid = NULL;
497 goto error;
498 }
499
500 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
501 if (IS_ERR(inode)) {
502 err = PTR_ERR(inode);
503 inode = NULL;
504 goto error;
505 }
506
507 dentry->d_op = &v9fs_dentry_operations;
508 d_instantiate(dentry, inode);
509
510 if (nd && nd->flags & LOOKUP_OPEN) {
511 ffid = v9fs_fid_create(v9ses, fid);
512 if (!ffid)
513 return -ENOMEM;
514
515 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
516 if (IS_ERR(filp)) {
517 v9fs_fid_destroy(ffid);
518 return PTR_ERR(filp);
519 }
520
521 ffid->rdir_pos = 0;
522 ffid->rdir_fcall = NULL;
523 ffid->fidopen = 1;
524 ffid->iounit = iounit;
525 ffid->filp = filp;
526 filp->private_data = ffid;
527 }
528
529 return 0;
530
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800531clunk_dfid:
532 v9fs_fid_clunk(v9ses, dfid);
533
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800534error:
535 if (vfid)
536 v9fs_fid_destroy(vfid);
537
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800538 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700539}
540
541/**
542 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700543 * @inode: inode that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700544 * @dentry: dentry that is being unlinked
545 * @mode: mode for new directory
546 *
547 */
548
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800549static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700550{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800551 int err;
552 u32 fid, perm;
553 struct v9fs_session_info *v9ses;
554 struct v9fs_fid *dfid, *vfid;
555 struct inode *inode;
556
557 inode = NULL;
558 vfid = NULL;
559 v9ses = v9fs_inode2v9ses(dir);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800560 dfid = v9fs_fid_clone(dentry->d_parent);
561 if(IS_ERR(dfid)) {
562 err = PTR_ERR(dfid);
563 goto error;
564 }
565
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800566 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
567
568 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800569 perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800570
571 if (err) {
572 dprintk(DEBUG_ERROR, "create error %d\n", err);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800573 goto clean_up_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800574 }
575
576 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
577 if (IS_ERR(vfid)) {
578 err = PTR_ERR(vfid);
579 vfid = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800580 goto clean_up_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800581 }
582
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800583 v9fs_fid_clunk(v9ses, dfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800584 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
585 if (IS_ERR(inode)) {
586 err = PTR_ERR(inode);
587 inode = NULL;
Adrian Bunk835d90c2007-02-08 14:20:38 -0800588 v9fs_fid_destroy(vfid);
589 goto error;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800590 }
591
592 dentry->d_op = &v9fs_dentry_operations;
593 d_instantiate(dentry, inode);
594 return 0;
595
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800596clean_up_dfid:
597 v9fs_fid_clunk(v9ses, dfid);
598
599error:
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800600 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700601}
602
603/**
604 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
605 * @dir: inode that is being walked from
606 * @dentry: dentry that is being walked to?
607 * @nameidata: path data
608 *
609 */
610
611static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
612 struct nameidata *nameidata)
613{
614 struct super_block *sb;
615 struct v9fs_session_info *v9ses;
616 struct v9fs_fid *dirfid;
617 struct v9fs_fid *fid;
618 struct inode *inode;
619 struct v9fs_fcall *fcall = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700620 int dirfidnum = -1;
621 int newfid = -1;
622 int result = 0;
623
624 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800625 dir, dentry->d_name.name, dentry, nameidata);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700626
627 sb = dir->i_sb;
628 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov5e7a99a2006-03-22 00:07:37 -0800629 dentry->d_op = &v9fs_dentry_operations;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700630 dirfid = v9fs_fid_lookup(dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700631
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800632 if(IS_ERR(dirfid))
633 return ERR_PTR(PTR_ERR(dirfid));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700634
635 dirfidnum = dirfid->fid;
636
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700637 newfid = v9fs_get_idpool(&v9ses->fidpool);
638 if (newfid < 0) {
639 eprintk(KERN_WARNING, "newfid fails!\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800640 result = -ENOSPC;
641 goto Release_Dirfid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700642 }
643
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800644 result = v9fs_t_walk(v9ses, dirfidnum, newfid,
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700645 (char *)dentry->d_name.name, &fcall);
646
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800647 up(&dirfid->lock);
648
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700649 if (result < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700650 if (fcall && fcall->id == RWALK)
651 v9fs_t_clunk(v9ses, newfid);
652 else
653 v9fs_put_idpool(newfid, &v9ses->fidpool);
654
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700655 if (result == -ENOENT) {
656 d_add(dentry, NULL);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700657 dprintk(DEBUG_VFS,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700658 "Return negative dentry %p count %d\n",
659 dentry, atomic_read(&dentry->d_count));
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700660 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700661 return NULL;
662 }
663 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
664 goto FreeFcall;
665 }
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700666 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700667
668 result = v9fs_t_stat(v9ses, newfid, &fcall);
669 if (result < 0) {
670 dprintk(DEBUG_ERROR, "stat error\n");
671 goto FreeFcall;
672 }
673
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800674 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
675 fcall->params.rstat.stat.mode));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700676
677 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
678 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
679 PTR_ERR(inode));
680
681 result = -ENOSPC;
682 goto FreeFcall;
683 }
684
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800685 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700686
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800687 fid = v9fs_fid_create(v9ses, newfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700688 if (fid == NULL) {
689 dprintk(DEBUG_ERROR, "couldn't insert\n");
690 result = -ENOMEM;
691 goto FreeFcall;
692 }
693
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800694 result = v9fs_fid_insert(fid, dentry);
695 if (result < 0)
696 goto FreeFcall;
697
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800698 fid->qid = fcall->params.rstat.stat.qid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800699 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700700
701 d_add(dentry, inode);
702 kfree(fcall);
703
704 return NULL;
705
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800706Release_Dirfid:
707 up(&dirfid->lock);
708
709FreeFcall:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700710 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800711
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700712 return ERR_PTR(result);
713}
714
715/**
716 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
717 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700718 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700719 *
720 */
721
722static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
723{
724 return v9fs_remove(i, d, 0);
725}
726
727/**
728 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
729 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700730 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700731 *
732 */
733
734static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
735{
736 return v9fs_remove(i, d, 1);
737}
738
739/**
740 * v9fs_vfs_rename - VFS hook to rename an inode
741 * @old_dir: old dir inode
742 * @old_dentry: old dentry
743 * @new_dir: new dir inode
744 * @new_dentry: new dentry
745 *
746 */
747
748static int
749v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
750 struct inode *new_dir, struct dentry *new_dentry)
751{
752 struct inode *old_inode = old_dentry->d_inode;
753 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700754 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800755 struct v9fs_fid *olddirfid;
756 struct v9fs_fid *newdirfid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800757 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700758 struct v9fs_fcall *fcall = NULL;
759 int fid = -1;
760 int olddirfidnum = -1;
761 int newdirfidnum = -1;
762 int retval = 0;
763
764 dprintk(DEBUG_VFS, "\n");
765
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800766 if(IS_ERR(oldfid))
767 return PTR_ERR(oldfid);
768
769 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
770 if(IS_ERR(olddirfid)) {
771 retval = PTR_ERR(olddirfid);
772 goto Release_lock;
773 }
774
775 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
776 if(IS_ERR(newdirfid)) {
777 retval = PTR_ERR(newdirfid);
778 goto Clunk_olddir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700779 }
780
781 /* 9P can only handle file rename in the same directory */
782 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
783 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
Eric Van Hensbergen621997c2007-01-26 00:57:04 -0800784 retval = -EXDEV;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800785 goto Clunk_newdir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700786 }
787
788 fid = oldfid->fid;
789 olddirfidnum = olddirfid->fid;
790 newdirfidnum = newdirfid->fid;
791
792 if (fid < 0) {
793 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
794 old_inode->i_ino);
795 retval = -EBADF;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800796 goto Clunk_newdir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700797 }
798
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800799 v9fs_blank_wstat(&wstat);
800 wstat.muid = v9ses->name;
801 wstat.name = (char *) new_dentry->d_name.name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700802
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800803 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700804
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700805 if (retval < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800806 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700807
808 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800809
810Clunk_newdir:
811 v9fs_fid_clunk(v9ses, newdirfid);
812
813Clunk_olddir:
814 v9fs_fid_clunk(v9ses, olddirfid);
815
816Release_lock:
817 up(&oldfid->lock);
818
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700819 return retval;
820}
821
822/**
Adrian Bunk943ffb52006-01-10 00:10:13 +0100823 * v9fs_vfs_getattr - retrieve file metadata
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700824 * @mnt - mount information
825 * @dentry - file to get attributes on
826 * @stat - metadata structure to populate
827 *
828 */
829
830static int
831v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
832 struct kstat *stat)
833{
834 struct v9fs_fcall *fcall = NULL;
835 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800836 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700837 int err = -EPERM;
838
839 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800840 if(IS_ERR(fid))
841 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700842
843 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
844
845 if (err < 0)
846 dprintk(DEBUG_ERROR, "stat error\n");
847 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800848 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700849 dentry->d_inode->i_sb);
850 generic_fillattr(dentry->d_inode, stat);
851 }
852
853 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800854 v9fs_fid_clunk(v9ses, fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700855 return err;
856}
857
858/**
859 * v9fs_vfs_setattr - set file metadata
860 * @dentry: file whose metadata to set
861 * @iattr: metadata assignment structure
862 *
863 */
864
865static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
866{
867 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800868 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700869 struct v9fs_fcall *fcall = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800870 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700871 int res = -EPERM;
872
873 dprintk(DEBUG_VFS, "\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800874 if(IS_ERR(fid))
875 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700876
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800877 v9fs_blank_wstat(&wstat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700878 if (iattr->ia_valid & ATTR_MODE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800879 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700880
881 if (iattr->ia_valid & ATTR_MTIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800882 wstat.mtime = iattr->ia_mtime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700883
884 if (iattr->ia_valid & ATTR_ATIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800885 wstat.atime = iattr->ia_atime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700886
887 if (iattr->ia_valid & ATTR_SIZE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800888 wstat.length = iattr->ia_size;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700889
890 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800891 if (iattr->ia_valid & ATTR_UID)
892 wstat.n_uid = iattr->ia_uid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700893
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800894 if (iattr->ia_valid & ATTR_GID)
895 wstat.n_gid = iattr->ia_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700896 }
897
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800898 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700899
900 if (res < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800901 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700902
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700903 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700904 if (res >= 0)
905 res = inode_setattr(dentry->d_inode, iattr);
906
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800907 v9fs_fid_clunk(v9ses, fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700908 return res;
909}
910
911/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800912 * v9fs_stat2inode - populate an inode structure with mistat info
913 * @stat: Plan 9 metadata (mistat) structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700914 * @inode: inode to populate
915 * @sb: superblock of filesystem
916 *
917 */
918
919void
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800920v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
921 struct super_block *sb)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700922{
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800923 int n;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800924 char ext[32];
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700925 struct v9fs_session_info *v9ses = sb->s_fs_info;
926
927 inode->i_nlink = 1;
928
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800929 inode->i_atime.tv_sec = stat->atime;
930 inode->i_mtime.tv_sec = stat->mtime;
931 inode->i_ctime.tv_sec = stat->mtime;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700932
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800933 inode->i_uid = v9ses->uid;
934 inode->i_gid = v9ses->gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700935
936 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800937 inode->i_uid = stat->n_uid;
938 inode->i_gid = stat->n_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700939 }
940
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800941 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700942 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
943 char type = 0;
944 int major = -1;
945 int minor = -1;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800946
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800947 n = stat->extension.len;
948 if (n > sizeof(ext)-1)
949 n = sizeof(ext)-1;
950 memmove(ext, stat->extension.str, n);
951 ext[n] = 0;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800952 sscanf(ext, "%c %u %u", &type, &major, &minor);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700953 switch (type) {
954 case 'c':
955 inode->i_mode &= ~S_IFBLK;
956 inode->i_mode |= S_IFCHR;
957 break;
958 case 'b':
959 break;
960 default:
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800961 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
962 type, stat->extension.len, stat->extension.str);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700963 };
964 inode->i_rdev = MKDEV(major, minor);
965 } else
966 inode->i_rdev = 0;
967
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800968 inode->i_size = stat->length;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700969
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700970 inode->i_blocks =
Theodore Ts'oba52de12006-09-27 01:50:49 -0700971 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700972}
973
974/**
975 * v9fs_qid2ino - convert qid into inode number
976 * @qid: qid to hash
977 *
978 * BUG: potential for inode number collisions?
979 */
980
981ino_t v9fs_qid2ino(struct v9fs_qid *qid)
982{
983 u64 path = qid->path + 2;
984 ino_t i = 0;
985
986 if (sizeof(ino_t) == sizeof(path))
987 memcpy(&i, &path, sizeof(ino_t));
988 else
989 i = (ino_t) (path ^ (path >> 32));
990
991 return i;
992}
993
994/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700995 * v9fs_readlink - read a symlink's location (internal version)
996 * @dentry: dentry for symlink
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700997 * @buffer: buffer to load symlink location into
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700998 * @buflen: length of buffer
999 *
1000 */
1001
1002static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1003{
1004 int retval = -EPERM;
1005
1006 struct v9fs_fcall *fcall = NULL;
1007 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001008 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001009
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001010 if(IS_ERR(fid))
1011 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001012
1013 if (!v9ses->extended) {
1014 retval = -EBADF;
1015 dprintk(DEBUG_ERROR, "not extended\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001016 goto ClunkFid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001017 }
1018
1019 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1020 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1021
1022 if (retval < 0) {
1023 dprintk(DEBUG_ERROR, "stat error\n");
1024 goto FreeFcall;
1025 }
1026
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001027 if (!fcall) {
1028 retval = -EIO;
1029 goto ClunkFid;
1030 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001031
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001032 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001033 retval = -EINVAL;
1034 goto FreeFcall;
1035 }
1036
1037 /* copy extension buffer into buffer */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001038 if (fcall->params.rstat.stat.extension.len < buflen)
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001039 buflen = fcall->params.rstat.stat.extension.len + 1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001040
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001041 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001042 buffer[buflen-1] = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001043
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001044 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
1045 fcall->params.rstat.stat.extension.str, buffer);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001046 retval = buflen;
1047
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001048FreeFcall:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001049 kfree(fcall);
1050
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001051ClunkFid:
1052 v9fs_fid_clunk(v9ses, fid);
1053
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001054 return retval;
1055}
1056
1057/**
1058 * v9fs_vfs_readlink - read a symlink's location
1059 * @dentry: dentry for symlink
1060 * @buf: buffer to load symlink location into
1061 * @buflen: length of buffer
1062 *
1063 */
1064
1065static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1066 int buflen)
1067{
1068 int retval;
1069 int ret;
1070 char *link = __getname();
1071
Florin Malita0710d362006-06-25 05:48:31 -07001072 if (unlikely(!link))
1073 return -ENOMEM;
1074
Latchesar Ionkova1f9d8d2005-09-22 21:43:52 -07001075 if (buflen > PATH_MAX)
1076 buflen = PATH_MAX;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001077
1078 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1079
1080 retval = v9fs_readlink(dentry, link, buflen);
1081
1082 if (retval > 0) {
1083 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1084 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1085 ret);
1086 retval = ret;
1087 }
1088 }
1089
Davi Arnautce44eeb2005-11-07 00:59:36 -08001090 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001091 return retval;
1092}
1093
1094/**
1095 * v9fs_vfs_follow_link - follow a symlink path
1096 * @dentry: dentry for symlink
1097 * @nd: nameidata
1098 *
1099 */
1100
1101static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1102{
1103 int len = 0;
1104 char *link = __getname();
1105
1106 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1107
1108 if (!link)
1109 link = ERR_PTR(-ENOMEM);
1110 else {
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001111 len = v9fs_readlink(dentry, link, PATH_MAX);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001112
1113 if (len < 0) {
Davi Arnautce44eeb2005-11-07 00:59:36 -08001114 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001115 link = ERR_PTR(len);
1116 } else
1117 link[len] = 0;
1118 }
1119 nd_set_link(nd, link);
1120
1121 return NULL;
1122}
1123
1124/**
1125 * v9fs_vfs_put_link - release a symlink path
1126 * @dentry: dentry for symlink
1127 * @nd: nameidata
1128 *
1129 */
1130
1131static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1132{
1133 char *s = nd_get_link(nd);
1134
1135 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1136 if (!IS_ERR(s))
Davi Arnautce44eeb2005-11-07 00:59:36 -08001137 __putname(s);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001138}
1139
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001140static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1141 int mode, const char *extension)
1142{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001143 int err;
1144 u32 fid, perm;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001145 struct v9fs_session_info *v9ses;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001146 struct v9fs_fid *dfid, *vfid = NULL;
1147 struct inode *inode = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001148
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001149 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001150 if (!v9ses->extended) {
1151 dprintk(DEBUG_ERROR, "not extended\n");
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001152 return -EPERM;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001153 }
1154
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001155 dfid = v9fs_fid_clone(dentry->d_parent);
1156 if(IS_ERR(dfid)) {
1157 err = PTR_ERR(dfid);
1158 goto error;
1159 }
1160
1161 perm = unixmode2p9mode(v9ses, mode);
1162
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001163 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001164 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001165
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001166 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001167 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001168
1169 err = v9fs_t_clunk(v9ses, fid);
1170 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001171 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001172
1173 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
1174 if (IS_ERR(vfid)) {
1175 err = PTR_ERR(vfid);
1176 vfid = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001177 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001178 }
1179
1180 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
1181 if (IS_ERR(inode)) {
1182 err = PTR_ERR(inode);
1183 inode = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001184 goto free_vfid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001185 }
1186
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001187 dentry->d_op = &v9fs_dentry_operations;
1188 d_instantiate(dentry, inode);
1189 return 0;
1190
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001191free_vfid:
1192 v9fs_fid_destroy(vfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001193
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001194clunk_dfid:
1195 v9fs_fid_clunk(v9ses, dfid);
1196
1197error:
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001198 return err;
1199
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001200}
1201
1202/**
1203 * v9fs_vfs_symlink - helper function to create symlinks
1204 * @dir: directory inode containing symlink
1205 * @dentry: dentry for symlink
1206 * @symname: symlink data
1207 *
1208 * See 9P2000.u RFC for more information
1209 *
1210 */
1211
1212static int
1213v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1214{
1215 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1216 symname);
1217
1218 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1219}
1220
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001221/**
1222 * v9fs_vfs_link - create a hardlink
1223 * @old_dentry: dentry for file to link to
1224 * @dir: inode destination for new link
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001225 * @dentry: dentry for link
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001226 *
1227 */
1228
1229/* XXX - lots of code dup'd from symlink and creates,
1230 * figure out a better reuse strategy
1231 */
1232
1233static int
1234v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1235 struct dentry *dentry)
1236{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001237 int retval;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001238 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001239 struct v9fs_fid *oldfid;
1240 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001241
1242 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1243 old_dentry->d_name.name);
1244
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001245 oldfid = v9fs_fid_clone(old_dentry);
1246 if(IS_ERR(oldfid))
1247 return PTR_ERR(oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001248
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001249 name = __getname();
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001250 if (unlikely(!name)) {
1251 retval = -ENOMEM;
1252 goto clunk_fid;
1253 }
Florin Malita0710d362006-06-25 05:48:31 -07001254
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001255 sprintf(name, "%d\n", oldfid->fid);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001256 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
1257 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001258
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001259clunk_fid:
1260 v9fs_fid_clunk(v9ses, oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001261 return retval;
1262}
1263
1264/**
1265 * v9fs_vfs_mknod - create a special file
1266 * @dir: inode destination for new link
1267 * @dentry: dentry for file
1268 * @mode: mode for creation
1269 * @dev_t: device associated with special file
1270 *
1271 */
1272
1273static int
1274v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1275{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001276 int retval;
1277 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001278
1279 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1280 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1281
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001282 if (!new_valid_dev(rdev))
1283 return -EINVAL;
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001284
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001285 name = __getname();
Eugene Teoc0291a02006-03-25 03:07:27 -08001286 if (!name)
1287 return -ENOMEM;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001288 /* build extension */
1289 if (S_ISBLK(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001290 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001291 else if (S_ISCHR(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001292 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001293 else if (S_ISFIFO(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001294 *name = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001295 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001296 __putname(name);
1297 return -EINVAL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001298 }
1299
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001300 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1301 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001302
1303 return retval;
1304}
1305
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001306static struct inode_operations v9fs_dir_inode_operations_ext = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001307 .create = v9fs_vfs_create,
1308 .lookup = v9fs_vfs_lookup,
1309 .symlink = v9fs_vfs_symlink,
1310 .link = v9fs_vfs_link,
1311 .unlink = v9fs_vfs_unlink,
1312 .mkdir = v9fs_vfs_mkdir,
1313 .rmdir = v9fs_vfs_rmdir,
1314 .mknod = v9fs_vfs_mknod,
1315 .rename = v9fs_vfs_rename,
1316 .readlink = v9fs_vfs_readlink,
1317 .getattr = v9fs_vfs_getattr,
1318 .setattr = v9fs_vfs_setattr,
1319};
1320
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001321static struct inode_operations v9fs_dir_inode_operations = {
1322 .create = v9fs_vfs_create,
1323 .lookup = v9fs_vfs_lookup,
1324 .unlink = v9fs_vfs_unlink,
1325 .mkdir = v9fs_vfs_mkdir,
1326 .rmdir = v9fs_vfs_rmdir,
1327 .mknod = v9fs_vfs_mknod,
1328 .rename = v9fs_vfs_rename,
1329 .getattr = v9fs_vfs_getattr,
1330 .setattr = v9fs_vfs_setattr,
1331};
1332
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001333static struct inode_operations v9fs_file_inode_operations = {
1334 .getattr = v9fs_vfs_getattr,
1335 .setattr = v9fs_vfs_setattr,
1336};
1337
1338static struct inode_operations v9fs_symlink_inode_operations = {
1339 .readlink = v9fs_vfs_readlink,
1340 .follow_link = v9fs_vfs_follow_link,
1341 .put_link = v9fs_vfs_put_link,
1342 .getattr = v9fs_vfs_getattr,
1343 .setattr = v9fs_vfs_setattr,
1344};