2 * linux/fs/9p/vfs_file.c
4 * This file contians vfs file ops for 9P2000.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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.
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.
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
27 #include <linux/module.h>
28 #include <linux/errno.h>
30 #include <linux/file.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/version.h>
36 #include <linux/list.h>
37 #include <asm/uaccess.h>
38 #include <linux/idr.h>
47 * v9fs_file_open - open a file (or directory)
48 * @inode: inode to be opened
49 * @file: file being opened
53 int v9fs_file_open(struct inode
*inode
, struct file
*file
)
55 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
56 struct v9fs_fid
*v9fid
, *fid
;
57 struct v9fs_fcall
*fcall
= NULL
;
59 unsigned int iounit
= 0;
63 dprintk(DEBUG_VFS
, "inode: %p file: %p \n", inode
, file
);
65 v9fid
= v9fs_fid_get_created(file
->f_dentry
);
67 v9fid
= v9fs_fid_lookup(file
->f_dentry
);
70 dprintk(DEBUG_ERROR
, "Couldn't resolve fid from dentry\n");
74 if (!v9fid
->fidcreate
) {
75 fid
= kmalloc(sizeof(struct v9fs_fid
), GFP_KERNEL
);
77 dprintk(DEBUG_ERROR
, "Out of Memory\n");
87 newfid
= v9fs_get_idpool(&v9ses
->fidpool
);
89 eprintk(KERN_WARNING
, "newfid fails!\n");
94 v9fs_t_walk(v9ses
, v9fid
->fid
, newfid
, NULL
, NULL
);
97 v9fs_put_idpool(newfid
, &v9ses
->fidpool
);
98 dprintk(DEBUG_ERROR
, "rewalk didn't work\n");
104 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
105 /* translate open mode appropriately */
106 open_mode
= file
->f_flags
& 0x3;
108 if (file
->f_flags
& O_EXCL
)
109 open_mode
|= V9FS_OEXCL
;
111 if (v9ses
->extended
) {
112 if (file
->f_flags
& O_TRUNC
)
113 open_mode
|= V9FS_OTRUNC
;
115 if (file
->f_flags
& O_APPEND
)
116 open_mode
|= V9FS_OAPPEND
;
119 result
= v9fs_t_open(v9ses
, newfid
, open_mode
, &fcall
);
121 PRINT_FCALL_ERROR("open failed", fcall
);
126 iounit
= fcall
->params
.ropen
.iounit
;
131 iounit
= v9fid
->iounit
;
132 v9fid
->fidcreate
= 0;
135 file
->private_data
= v9fid
;
138 v9fid
->rdir_fcall
= NULL
;
141 v9fid
->iounit
= iounit
;
147 * v9fs_file_lock - lock a file (or directory)
148 * @inode: inode to be opened
149 * @file: file being opened
151 * XXX - this looks like a local only lock, we should extend into 9P
152 * by using open exclusive
155 static int v9fs_file_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
158 struct inode
*inode
= filp
->f_dentry
->d_inode
;
160 dprintk(DEBUG_VFS
, "filp: %p lock: %p\n", filp
, fl
);
162 /* No mandatory locks */
163 if ((inode
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
)
166 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
)) && fl
->fl_type
!= F_UNLCK
) {
167 filemap_write_and_wait(inode
->i_mapping
);
168 invalidate_inode_pages(&inode
->i_data
);
175 * v9fs_file_read - read from a file
176 * @filep: file pointer to read
177 * @data: data buffer to read data into
178 * @count: size of buffer
179 * @offset: offset at which to read data
183 v9fs_file_read(struct file
*filp
, char __user
* data
, size_t count
,
186 struct inode
*inode
= filp
->f_dentry
->d_inode
;
187 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
188 struct v9fs_fid
*v9f
= filp
->private_data
;
189 struct v9fs_fcall
*fcall
= NULL
;
196 dprintk(DEBUG_VFS
, "\n");
198 rsize
= v9ses
->maxdata
- V9FS_IOHDRSZ
;
199 if (v9f
->iounit
!= 0 && rsize
> v9f
->iounit
)
206 result
= v9fs_t_read(v9ses
, fid
, *offset
, rsize
, &fcall
);
209 printk(KERN_ERR
"9P2000: v9fs_t_read returned %d\n",
217 n
= copy_to_user(data
, fcall
->params
.rread
.data
, result
);
219 dprintk(DEBUG_ERROR
, "Problem copying to user %d\n", n
);
238 * v9fs_file_write - write to a file
239 * @filep: file pointer to write
240 * @data: data buffer to write data from
241 * @count: size of buffer
242 * @offset: offset at which to write data
247 v9fs_file_write(struct file
*filp
, const char __user
* data
,
248 size_t count
, loff_t
* offset
)
250 struct inode
*inode
= filp
->f_dentry
->d_inode
;
251 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
252 struct v9fs_fid
*v9fid
= filp
->private_data
;
253 struct v9fs_fcall
*fcall
;
254 int fid
= v9fid
->fid
;
259 dprintk(DEBUG_VFS
, "data %p count %d offset %x\n", data
, (int)count
,
261 rsize
= v9ses
->maxdata
- V9FS_IOHDRSZ
;
262 if (v9fid
->iounit
!= 0 && rsize
> v9fid
->iounit
)
263 rsize
= v9fid
->iounit
;
269 result
= v9fs_t_write(v9ses
, fid
, *offset
, rsize
, data
, &fcall
);
271 PRINT_FCALL_ERROR("error while writing", fcall
);
280 if (result
!= rsize
) {
282 "short write: v9fs_t_write returned %d\n",
295 struct file_operations v9fs_file_operations
= {
296 .llseek
= generic_file_llseek
,
297 .read
= v9fs_file_read
,
298 .write
= v9fs_file_write
,
299 .open
= v9fs_file_open
,
300 .release
= v9fs_dir_release
,
301 .lock
= v9fs_file_lock
,