173 lines
3.6 KiB
C
173 lines
3.6 KiB
C
/*
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* linux/fs/9p/trans_fd.c
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*
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* File Descriptor Transport Layer
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*
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* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/un.h>
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#include <asm/uaccess.h>
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#include <linux/inet.h>
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#include <linux/idr.h>
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#include <linux/file.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "transport.h"
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struct v9fs_trans_fd {
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struct file *in_file;
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struct file *out_file;
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};
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/**
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* v9fs_fd_recv - receive from a socket
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* @v9ses: session information
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* @v: buffer to receive data into
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* @len: size of receive buffer
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*
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*/
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static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len)
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{
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struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
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if (!trans || trans->status != Connected || !ts)
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return -EIO;
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return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
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}
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/**
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* v9fs_fd_send - send to a socket
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* @v9ses: session information
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* @v: buffer to send data from
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* @len: size of send buffer
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*
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*/
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static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len)
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{
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struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
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mm_segment_t oldfs = get_fs();
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int ret = 0;
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if (!trans || trans->status != Connected || !ts)
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return -EIO;
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set_fs(get_ds());
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/* The cast to a user pointer is valid due to the set_fs() */
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ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos);
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set_fs(oldfs);
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return ret;
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}
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/**
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* v9fs_fd_init - initialize file descriptor transport
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* @v9ses: session information
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* @addr: address of server to mount
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* @data: mount options
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*
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*/
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static int
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v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
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{
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struct v9fs_trans_fd *ts = NULL;
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struct v9fs_transport *trans = v9ses->transport;
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if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
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printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
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return -ENOPROTOOPT;
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}
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sema_init(&trans->writelock, 1);
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sema_init(&trans->readlock, 1);
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ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->in_file = fget( v9ses->rfdno );
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ts->out_file = fget( v9ses->wfdno );
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if (!ts->in_file || !ts->out_file) {
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if (ts->in_file)
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fput(ts->in_file);
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if (ts->out_file)
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fput(ts->out_file);
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kfree(ts);
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return -EIO;
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}
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trans->priv = ts;
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trans->status = Connected;
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return 0;
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}
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/**
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* v9fs_fd_close - shutdown file descriptor
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* @trans: private socket structure
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*
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*/
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static void v9fs_fd_close(struct v9fs_transport *trans)
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{
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struct v9fs_trans_fd *ts;
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if (!trans)
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return;
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trans->status = Disconnected;
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ts = trans->priv;
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if (!ts)
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return;
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if (ts->in_file)
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fput(ts->in_file);
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if (ts->out_file)
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fput(ts->out_file);
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kfree(ts);
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}
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struct v9fs_transport v9fs_trans_fd = {
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.init = v9fs_fd_init,
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.write = v9fs_fd_send,
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.read = v9fs_fd_recv,
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.close = v9fs_fd_close,
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};
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