364 lines
7.8 KiB
C
364 lines
7.8 KiB
C
/*
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* linux/fs/9p/trans_fd.c
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*
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* Fd transport layer. Includes deprecated socket layer.
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*
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* Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
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* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004-2005 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.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 version 2
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* as published by the Free Software Foundation.
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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/in.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 <linux/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 <net/9p/9p.h>
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#include <net/9p/transport.h>
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#define P9_PORT 564
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struct p9_trans_fd {
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struct file *rd;
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struct file *wr;
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};
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static int p9_socket_open(struct p9_transport *trans, struct socket *csocket);
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static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd);
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static int p9_fd_read(struct p9_transport *trans, void *v, int len);
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static int p9_fd_write(struct p9_transport *trans, void *v, int len);
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static unsigned int p9_fd_poll(struct p9_transport *trans,
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struct poll_table_struct *pt);
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static void p9_fd_close(struct p9_transport *trans);
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struct p9_transport *p9_trans_create_tcp(const char *addr, int port)
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{
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int err;
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struct p9_transport *trans;
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struct socket *csocket;
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struct sockaddr_in sin_server;
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csocket = NULL;
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trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
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if (!trans)
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return ERR_PTR(-ENOMEM);
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trans->write = p9_fd_write;
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trans->read = p9_fd_read;
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trans->close = p9_fd_close;
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trans->poll = p9_fd_poll;
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sin_server.sin_family = AF_INET;
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sin_server.sin_addr.s_addr = in_aton(addr);
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sin_server.sin_port = htons(port);
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sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
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if (!csocket) {
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P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
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err = -EIO;
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goto error;
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}
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err = csocket->ops->connect(csocket,
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(struct sockaddr *)&sin_server,
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sizeof(struct sockaddr_in), 0);
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if (err < 0) {
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P9_EPRINTK(KERN_ERR,
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"p9_trans_tcp: problem connecting socket to %s\n",
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addr);
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goto error;
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}
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err = p9_socket_open(trans, csocket);
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if (err < 0)
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goto error;
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return trans;
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error:
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if (csocket)
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sock_release(csocket);
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kfree(trans);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(p9_trans_create_tcp);
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struct p9_transport *p9_trans_create_unix(const char *addr)
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{
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int err;
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struct socket *csocket;
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struct sockaddr_un sun_server;
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struct p9_transport *trans;
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csocket = NULL;
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trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
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if (!trans)
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return ERR_PTR(-ENOMEM);
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trans->write = p9_fd_write;
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trans->read = p9_fd_read;
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trans->close = p9_fd_close;
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trans->poll = p9_fd_poll;
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if (strlen(addr) > UNIX_PATH_MAX) {
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P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
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addr);
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err = -ENAMETOOLONG;
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goto error;
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}
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sun_server.sun_family = PF_UNIX;
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strcpy(sun_server.sun_path, addr);
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sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
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err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
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sizeof(struct sockaddr_un) - 1, 0);
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if (err < 0) {
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P9_EPRINTK(KERN_ERR,
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"p9_trans_unix: problem connecting socket: %s: %d\n",
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addr, err);
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goto error;
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}
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err = p9_socket_open(trans, csocket);
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if (err < 0)
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goto error;
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return trans;
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error:
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if (csocket)
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sock_release(csocket);
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kfree(trans);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(p9_trans_create_unix);
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struct p9_transport *p9_trans_create_fd(int rfd, int wfd)
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{
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int err;
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struct p9_transport *trans;
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if (rfd == ~0 || wfd == ~0) {
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printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
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return ERR_PTR(-ENOPROTOOPT);
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}
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trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
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if (!trans)
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return ERR_PTR(-ENOMEM);
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trans->write = p9_fd_write;
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trans->read = p9_fd_read;
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trans->close = p9_fd_close;
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trans->poll = p9_fd_poll;
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err = p9_fd_open(trans, rfd, wfd);
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if (err < 0)
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goto error;
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return trans;
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error:
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kfree(trans);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(p9_trans_create_fd);
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static int p9_socket_open(struct p9_transport *trans, struct socket *csocket)
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{
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int fd, ret;
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csocket->sk->sk_allocation = GFP_NOIO;
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fd = sock_map_fd(csocket);
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if (fd < 0) {
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P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
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return fd;
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}
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ret = p9_fd_open(trans, fd, fd);
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if (ret < 0) {
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P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
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sockfd_put(csocket);
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return ret;
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}
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((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK;
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return 0;
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}
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static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd)
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{
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struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
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GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->rd = fget(rfd);
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ts->wr = fget(wfd);
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if (!ts->rd || !ts->wr) {
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if (ts->rd)
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fput(ts->rd);
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if (ts->wr)
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fput(ts->wr);
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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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* p9_fd_read- read from a fd
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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 p9_fd_read(struct p9_transport *trans, void *v, int len)
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{
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int ret;
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struct p9_trans_fd *ts = NULL;
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if (trans && trans->status != Disconnected)
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ts = trans->priv;
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if (!ts)
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return -EREMOTEIO;
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if (!(ts->rd->f_flags & O_NONBLOCK))
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P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
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ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
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if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
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trans->status = Disconnected;
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return ret;
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}
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/**
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* p9_fd_write - write 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 p9_fd_write(struct p9_transport *trans, void *v, int len)
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{
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int ret;
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mm_segment_t oldfs;
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struct p9_trans_fd *ts = NULL;
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if (trans && trans->status != Disconnected)
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ts = trans->priv;
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if (!ts)
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return -EREMOTEIO;
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if (!(ts->wr->f_flags & O_NONBLOCK))
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P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
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oldfs = get_fs();
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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->wr, (void __user *)v, len, &ts->wr->f_pos);
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set_fs(oldfs);
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if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
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trans->status = Disconnected;
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return ret;
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}
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static unsigned int
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p9_fd_poll(struct p9_transport *trans, struct poll_table_struct *pt)
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{
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int ret, n;
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struct p9_trans_fd *ts = NULL;
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mm_segment_t oldfs;
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if (trans && trans->status == Connected)
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ts = trans->priv;
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if (!ts)
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return -EREMOTEIO;
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if (!ts->rd->f_op || !ts->rd->f_op->poll)
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return -EIO;
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if (!ts->wr->f_op || !ts->wr->f_op->poll)
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return -EIO;
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oldfs = get_fs();
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set_fs(get_ds());
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ret = ts->rd->f_op->poll(ts->rd, pt);
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if (ret < 0)
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goto end;
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if (ts->rd != ts->wr) {
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n = ts->wr->f_op->poll(ts->wr, pt);
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if (n < 0) {
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ret = n;
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goto end;
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}
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ret = (ret & ~POLLOUT) | (n & ~POLLIN);
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}
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end:
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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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* p9_sock_close - shutdown socket
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* @trans: private socket structure
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*
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*/
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static void p9_fd_close(struct p9_transport *trans)
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{
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struct p9_trans_fd *ts;
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if (!trans)
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return;
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ts = xchg(&trans->priv, NULL);
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if (!ts)
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return;
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trans->status = Disconnected;
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if (ts->rd)
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fput(ts->rd);
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if (ts->wr)
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fput(ts->wr);
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kfree(ts);
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}
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