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/*
* linux/fs/9p/trans_fd.c
*
* File Descriptor Transport Layer
*
* Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/config.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/ipv6.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/un.h>
#include <asm/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include "debug.h"
#include "v9fs.h"
#include "transport.h"
struct v9fs_trans_fd {
struct file *in_file;
struct file *out_file;
};
/**
* v9fs_fd_recv - receive from a socket
* @v9ses: session information
* @v: buffer to receive data into
* @len: size of receive buffer
*
*/
static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len)
{
struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
if (!trans || trans->status != Connected || !ts)
return -EIO;
return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
}
/**
* v9fs_fd_send - send to a socket
* @v9ses: session information
* @v: buffer to send data from
* @len: size of send buffer
*
*/
static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len)
{
struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
mm_segment_t oldfs = get_fs();
int ret = 0;
if (!trans || trans->status != Connected || !ts)
return -EIO;
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos);
set_fs(oldfs);
return ret;
}
/**
* v9fs_fd_init - initialize file descriptor transport
* @v9ses: session information
* @addr: address of server to mount
* @data: mount options
*
*/
static int
v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
{
struct v9fs_trans_fd *ts = NULL;
struct v9fs_transport *trans = v9ses->transport;
if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
return -ENOPROTOOPT;
}
ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
if (!ts)
return -ENOMEM;
ts->in_file = fget( v9ses->rfdno );
ts->out_file = fget( v9ses->wfdno );
if (!ts->in_file || !ts->out_file) {
if (ts->in_file)
fput(ts->in_file);
if (ts->out_file)
fput(ts->out_file);
kfree(ts);
return -EIO;
}
trans->priv = ts;
trans->status = Connected;
return 0;
}
/**
* v9fs_fd_close - shutdown file descriptor
* @trans: private socket structure
*
*/
static void v9fs_fd_close(struct v9fs_transport *trans)
{
struct v9fs_trans_fd *ts;
if (!trans)
return;
ts = xchg(&trans->priv, NULL);
if (!ts)
return;
trans->status = Disconnected;
if (ts->in_file)
fput(ts->in_file);
if (ts->out_file)
fput(ts->out_file);
kfree(ts);
}
static unsigned int
v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
{
int ret, n;
struct v9fs_trans_fd *ts;
mm_segment_t oldfs;
if (!trans)
return -EIO;
ts = trans->priv;
if (trans->status != Connected || !ts)
return -EIO;
oldfs = get_fs();
set_fs(get_ds());
if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
ret = -EIO;
goto end;
}
ret = ts->in_file->f_op->poll(ts->in_file, pt);
if (ts->out_file != ts->in_file) {
if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
ret = -EIO;
goto end;
}
n = ts->out_file->f_op->poll(ts->out_file, pt);
ret &= ~POLLOUT;
n &= ~POLLIN;
ret |= n;
}
end:
set_fs(oldfs);
return ret;
}
struct v9fs_transport v9fs_trans_fd = {
.init = v9fs_fd_init,
.write = v9fs_fd_send,
.read = v9fs_fd_recv,
.close = v9fs_fd_close,
.poll = v9fs_fd_poll,
};
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