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 version 2
11 * as published by the Free Software Foundation.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/sched.h>
30 #include <linux/file.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/list.h>
35 #include <asm/uaccess.h>
36 #include <linux/idr.h>
37 #include <net/9p/9p.h>
38 #include <net/9p/client.h>
44 static const struct file_operations v9fs_cached_file_operations;
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)
56 struct v9fs_session_info *v9ses;
60 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
61 v9ses = v9fs_inode2v9ses(inode);
62 omode = v9fs_uflags2omode(file->f_flags);
63 fid = file->private_data;
65 fid = v9fs_fid_clone(file->f_path.dentry);
69 err = p9_client_open(fid, omode);
76 file->private_data = fid;
77 if ((fid->qid.version) && (v9ses->cache)) {
78 P9_DPRINTK(P9_DEBUG_VFS, "cached");
79 /* enable cached file options */
80 if(file->f_op == &v9fs_file_operations)
81 file->f_op = &v9fs_cached_file_operations;
88 * v9fs_file_lock - lock a file (or directory)
89 * @inode: inode to be opened
90 * @file: file being opened
92 * XXX - this looks like a local only lock, we should extend into 9P
93 * by using open exclusive
96 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
99 struct inode *inode = filp->f_path.dentry->d_inode;
101 P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
103 /* No mandatory locks */
104 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
107 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
108 filemap_write_and_wait(inode->i_mapping);
109 invalidate_mapping_pages(&inode->i_data, 0, -1);
116 * v9fs_file_read - read from a file
117 * @filep: file pointer to read
118 * @data: data buffer to read data into
119 * @count: size of buffer
120 * @offset: offset at which to read data
124 v9fs_file_read(struct file *filp, char __user * data, size_t count,
130 P9_DPRINTK(P9_DEBUG_VFS, "\n");
131 fid = filp->private_data;
132 ret = p9_client_uread(fid, data, *offset, count);
140 * v9fs_file_write - write to a file
141 * @filep: file pointer to write
142 * @data: data buffer to write data from
143 * @count: size of buffer
144 * @offset: offset at which to write data
149 v9fs_file_write(struct file *filp, const char __user * data,
150 size_t count, loff_t * offset)
155 P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
156 (int)count, (int)*offset);
158 fid = filp->private_data;
159 ret = p9_client_uwrite(fid, data, *offset, count);
163 invalidate_inode_pages2(filp->f_path.dentry->d_inode->i_mapping);
167 static const struct file_operations v9fs_cached_file_operations = {
168 .llseek = generic_file_llseek,
169 .read = do_sync_read,
170 .aio_read = generic_file_aio_read,
171 .write = v9fs_file_write,
172 .open = v9fs_file_open,
173 .release = v9fs_dir_release,
174 .lock = v9fs_file_lock,
175 .mmap = generic_file_mmap,
178 const struct file_operations v9fs_file_operations = {
179 .llseek = generic_file_llseek,
180 .read = v9fs_file_read,
181 .write = v9fs_file_write,
182 .open = v9fs_file_open,
183 .release = v9fs_dir_release,
184 .lock = v9fs_file_lock,
185 .mmap = generic_file_mmap,