You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
196 lines
4.7 KiB
196 lines
4.7 KiB
/*
|
|
* linux/fs/9p/vfs_file.c
|
|
*
|
|
* This file contians vfs file ops for 9P2000.
|
|
*
|
|
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/file.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/string.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/list.h>
|
|
#include <asm/uaccess.h>
|
|
#include <linux/idr.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
static const struct file_operations v9fs_cached_file_operations;
|
|
|
|
/**
|
|
* v9fs_file_open - open a file (or directory)
|
|
* @inode: inode to be opened
|
|
* @file: file being opened
|
|
*
|
|
*/
|
|
|
|
int v9fs_file_open(struct inode *inode, struct file *file)
|
|
{
|
|
int err;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
int omode;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
omode = v9fs_uflags2omode(file->f_flags);
|
|
fid = file->private_data;
|
|
if (!fid) {
|
|
fid = v9fs_fid_clone(file->f_path.dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
err = p9_client_open(fid, omode);
|
|
if (err < 0) {
|
|
p9_client_clunk(fid);
|
|
return err;
|
|
}
|
|
if (omode & P9_OTRUNC) {
|
|
inode->i_size = 0;
|
|
inode->i_blocks = 0;
|
|
}
|
|
}
|
|
|
|
file->private_data = fid;
|
|
if ((fid->qid.version) && (v9ses->cache)) {
|
|
P9_DPRINTK(P9_DEBUG_VFS, "cached");
|
|
/* enable cached file options */
|
|
if(file->f_op == &v9fs_file_operations)
|
|
file->f_op = &v9fs_cached_file_operations;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_lock - lock a file (or directory)
|
|
* @inode: inode to be opened
|
|
* @file: file being opened
|
|
*
|
|
* XXX - this looks like a local only lock, we should extend into 9P
|
|
* by using open exclusive
|
|
*/
|
|
|
|
static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
int res = 0;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
|
|
|
|
/* No mandatory locks */
|
|
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
return -ENOLCK;
|
|
|
|
if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
invalidate_mapping_pages(&inode->i_data, 0, -1);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_read - read from a file
|
|
* @filep: file pointer to read
|
|
* @data: data buffer to read data into
|
|
* @count: size of buffer
|
|
* @offset: offset at which to read data
|
|
*
|
|
*/
|
|
static ssize_t
|
|
v9fs_file_read(struct file *filp, char __user * data, size_t count,
|
|
loff_t * offset)
|
|
{
|
|
int ret;
|
|
struct p9_fid *fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "\n");
|
|
fid = filp->private_data;
|
|
ret = p9_client_uread(fid, data, *offset, count);
|
|
if (ret > 0)
|
|
*offset += ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_write - write to a file
|
|
* @filep: file pointer to write
|
|
* @data: data buffer to write data from
|
|
* @count: size of buffer
|
|
* @offset: offset at which to write data
|
|
*
|
|
*/
|
|
|
|
static ssize_t
|
|
v9fs_file_write(struct file *filp, const char __user * data,
|
|
size_t count, loff_t * offset)
|
|
{
|
|
int ret;
|
|
struct p9_fid *fid;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
|
|
(int)count, (int)*offset);
|
|
|
|
fid = filp->private_data;
|
|
ret = p9_client_uwrite(fid, data, *offset, count);
|
|
if (ret > 0)
|
|
*offset += ret;
|
|
|
|
if (*offset > inode->i_size) {
|
|
inode->i_size = *offset;
|
|
inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
|
|
}
|
|
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations v9fs_cached_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = v9fs_file_write,
|
|
.open = v9fs_file_open,
|
|
.release = v9fs_dir_release,
|
|
.lock = v9fs_file_lock,
|
|
.mmap = generic_file_mmap,
|
|
};
|
|
|
|
const struct file_operations v9fs_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = v9fs_file_read,
|
|
.write = v9fs_file_write,
|
|
.open = v9fs_file_open,
|
|
.release = v9fs_dir_release,
|
|
.lock = v9fs_file_lock,
|
|
.mmap = generic_file_mmap,
|
|
};
|
|
|