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
*vfid
;
57 struct v9fs_fcall
*fcall
= NULL
;
62 dprintk(DEBUG_VFS
, "inode: %p file: %p \n", inode
, file
);
64 vfid
= v9fs_fid_lookup(file
->f_dentry
);
66 dprintk(DEBUG_ERROR
, "Couldn't resolve fid from dentry\n");
70 fid
= v9fs_get_idpool(&v9ses
->fidpool
);
72 eprintk(KERN_WARNING
, "newfid fails!\n");
76 err
= v9fs_t_walk(v9ses
, vfid
->fid
, fid
, NULL
, NULL
);
78 dprintk(DEBUG_ERROR
, "rewalk didn't work\n");
82 /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
83 /* translate open mode appropriately */
84 omode
= v9fs_uflags2omode(file
->f_flags
);
85 err
= v9fs_t_open(v9ses
, fid
, omode
, &fcall
);
87 PRINT_FCALL_ERROR("open failed", fcall
);
91 vfid
= kmalloc(sizeof(struct v9fs_fid
), GFP_KERNEL
);
93 dprintk(DEBUG_ERROR
, "out of memory\n");
98 file
->private_data
= vfid
;
101 vfid
->fidclunked
= 0;
102 vfid
->iounit
= fcall
->params
.ropen
.iounit
;
104 vfid
->rdir_fcall
= NULL
;
111 v9fs_t_clunk(v9ses
, fid
);
114 v9fs_put_idpool(fid
, &v9ses
->fidpool
);
121 * v9fs_file_lock - lock a file (or directory)
122 * @inode: inode to be opened
123 * @file: file being opened
125 * XXX - this looks like a local only lock, we should extend into 9P
126 * by using open exclusive
129 static int v9fs_file_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
132 struct inode
*inode
= filp
->f_dentry
->d_inode
;
134 dprintk(DEBUG_VFS
, "filp: %p lock: %p\n", filp
, fl
);
136 /* No mandatory locks */
137 if ((inode
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
)
140 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
)) && fl
->fl_type
!= F_UNLCK
) {
141 filemap_write_and_wait(inode
->i_mapping
);
142 invalidate_inode_pages(&inode
->i_data
);
149 * v9fs_file_read - read from a file
150 * @filep: file pointer to read
151 * @data: data buffer to read data into
152 * @count: size of buffer
153 * @offset: offset at which to read data
157 v9fs_file_read(struct file
*filp
, char __user
* data
, size_t count
,
160 struct inode
*inode
= filp
->f_dentry
->d_inode
;
161 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
162 struct v9fs_fid
*v9f
= filp
->private_data
;
163 struct v9fs_fcall
*fcall
= NULL
;
170 dprintk(DEBUG_VFS
, "\n");
172 rsize
= v9ses
->maxdata
- V9FS_IOHDRSZ
;
173 if (v9f
->iounit
!= 0 && rsize
> v9f
->iounit
)
180 result
= v9fs_t_read(v9ses
, fid
, *offset
, rsize
, &fcall
);
183 printk(KERN_ERR
"9P2000: v9fs_t_read returned %d\n",
191 n
= copy_to_user(data
, fcall
->params
.rread
.data
, result
);
193 dprintk(DEBUG_ERROR
, "Problem copying to user %d\n", n
);
212 * v9fs_file_write - write to a file
213 * @filep: file pointer to write
214 * @data: data buffer to write data from
215 * @count: size of buffer
216 * @offset: offset at which to write data
221 v9fs_file_write(struct file
*filp
, const char __user
* data
,
222 size_t count
, loff_t
* offset
)
224 struct inode
*inode
= filp
->f_dentry
->d_inode
;
225 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
226 struct v9fs_fid
*v9fid
= filp
->private_data
;
227 struct v9fs_fcall
*fcall
;
228 int fid
= v9fid
->fid
;
233 dprintk(DEBUG_VFS
, "data %p count %d offset %x\n", data
, (int)count
,
235 rsize
= v9ses
->maxdata
- V9FS_IOHDRSZ
;
236 if (v9fid
->iounit
!= 0 && rsize
> v9fid
->iounit
)
237 rsize
= v9fid
->iounit
;
243 result
= v9fs_t_write(v9ses
, fid
, *offset
, rsize
, data
, &fcall
);
245 PRINT_FCALL_ERROR("error while writing", fcall
);
254 if (result
!= rsize
) {
256 "short write: v9fs_t_write returned %d\n",
266 invalidate_inode_pages2(inode
->i_mapping
);
270 struct file_operations v9fs_file_operations
= {
271 .llseek
= generic_file_llseek
,
272 .read
= v9fs_file_read
,
273 .write
= v9fs_file_write
,
274 .open
= v9fs_file_open
,
275 .release
= v9fs_dir_release
,
276 .lock
= v9fs_file_lock
,
277 .mmap
= generic_file_mmap
,