--- /dev/null
+/*
+ * linux/fs/9p/trans_socket.c
+ *
+ * Socket Transport Layer
+ *
+ * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
+ * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
+ * Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
+ *
+ * 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/in.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"
+
+#define V9FS_PORT 564
+
+struct v9fs_trans_sock {
+ struct socket *s;
+ struct file *filp;
+};
+
+/**
+ * v9fs_sock_recv - receive from a socket
+ * @v9ses: session information
+ * @v: buffer to receive data into
+ * @len: size of receive buffer
+ *
+ */
+
+static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
+{
+ int ret;
+ struct v9fs_trans_sock *ts;
+
+ if (!trans || trans->status == Disconnected) {
+ dprintk(DEBUG_ERROR, "disconnected ...\n");
+ return -EREMOTEIO;
+ }
+
+ ts = trans->priv;
+
+ if (!(ts->filp->f_flags & O_NONBLOCK))
+ dprintk(DEBUG_ERROR, "blocking read ...\n");
+
+ ret = kernel_read(ts->filp, ts->filp->f_pos, v, len);
+ if (ret <= 0) {
+ if (ret != -ERESTARTSYS && ret != -EAGAIN)
+ trans->status = Disconnected;
+ }
+
+ return ret;
+}
+
+/**
+ * v9fs_sock_send - send to a socket
+ * @v9ses: session information
+ * @v: buffer to send data from
+ * @len: size of send buffer
+ *
+ */
+
+static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
+{
+ int ret;
+ mm_segment_t oldfs;
+ struct v9fs_trans_sock *ts;
+
+ if (!trans || trans->status == Disconnected) {
+ dprintk(DEBUG_ERROR, "disconnected ...\n");
+ return -EREMOTEIO;
+ }
+
+ ts = trans->priv;
+ if (!ts) {
+ dprintk(DEBUG_ERROR, "no transport ...\n");
+ return -EREMOTEIO;
+ }
+
+ if (!(ts->filp->f_flags & O_NONBLOCK))
+ dprintk(DEBUG_ERROR, "blocking write ...\n");
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+ ret = vfs_write(ts->filp, (void __user *)v, len, &ts->filp->f_pos);
+ set_fs(oldfs);
+
+ if (ret < 0) {
+ if (ret != -ERESTARTSYS)
+ trans->status = Disconnected;
+ }
+
+ return ret;
+}
+
+static unsigned int v9fs_sock_poll(struct v9fs_transport *trans,
+ struct poll_table_struct *pt) {
+
+ int ret;
+ struct v9fs_trans_sock *ts;
+ mm_segment_t oldfs;
+
+ if (!trans) {
+ dprintk(DEBUG_ERROR, "no transport\n");
+ return -EIO;
+ }
+
+ ts = trans->priv;
+ if (trans->status != Connected || !ts) {
+ dprintk(DEBUG_ERROR, "transport disconnected: %d\n", trans->status);
+ return -EIO;
+ }
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+
+ if (!ts->filp->f_op || !ts->filp->f_op->poll) {
+ dprintk(DEBUG_ERROR, "no poll operation\n");
+ ret = -EIO;
+ goto end;
+ }
+
+ ret = ts->filp->f_op->poll(ts->filp, pt);
+
+end:
+ set_fs(oldfs);
+ return ret;
+}
+
+
+/**
+ * v9fs_tcp_init - initialize TCP socket
+ * @v9ses: session information
+ * @addr: address of server to mount
+ * @data: mount options
+ *
+ */
+
+static int
+v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
+{
+ struct socket *csocket = NULL;
+ struct sockaddr_in sin_server;
+ int rc = 0;
+ struct v9fs_trans_sock *ts = NULL;
+ struct v9fs_transport *trans = v9ses->transport;
+ int fd;
+
+ trans->status = Disconnected;
+
+ ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
+
+ if (!ts)
+ return -ENOMEM;
+
+ trans->priv = ts;
+ ts->s = NULL;
+ ts->filp = NULL;
+
+ if (!addr)
+ return -EINVAL;
+
+ dprintk(DEBUG_TRANS, "Connecting to %s\n", addr);
+
+ sin_server.sin_family = AF_INET;
+ sin_server.sin_addr.s_addr = in_aton(addr);
+ sin_server.sin_port = htons(v9ses->port);
+ sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
+ rc = csocket->ops->connect(csocket,
+ (struct sockaddr *)&sin_server,
+ sizeof(struct sockaddr_in), 0);
+ if (rc < 0) {
+ eprintk(KERN_ERR,
+ "v9fs_trans_tcp: problem connecting socket to %s\n",
+ addr);
+ return rc;
+ }
+ csocket->sk->sk_allocation = GFP_NOIO;
+
+ fd = sock_map_fd(csocket);
+ if (fd < 0) {
+ sock_release(csocket);
+ kfree(ts);
+ trans->priv = NULL;
+ return fd;
+ }
+
+ ts->s = csocket;
+ ts->filp = fget(fd);
+ ts->filp->f_flags |= O_NONBLOCK;
+ trans->status = Connected;
+
+ return 0;
+}
+
+/**
+ * v9fs_unix_init - initialize UNIX domain socket
+ * @v9ses: session information
+ * @dev_name: path to named pipe
+ * @data: mount options
+ *
+ */
+
+static int
+v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
+ char *data)
+{
+ int rc, fd;
+ struct socket *csocket;
+ struct sockaddr_un sun_server;
+ struct v9fs_transport *trans;
+ struct v9fs_trans_sock *ts;
+
+ rc = 0;
+ csocket = NULL;
+ trans = v9ses->transport;
+
+ trans->status = Disconnected;
+
+ if (strlen(dev_name) > UNIX_PATH_MAX) {
+ eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
+ dev_name);
+ return -ENOMEM;
+ }
+
+ ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ trans->priv = ts;
+ ts->s = NULL;
+ ts->filp = NULL;
+
+ sun_server.sun_family = PF_UNIX;
+ strcpy(sun_server.sun_path, dev_name);
+ sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
+ rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
+ sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */
+ if (rc < 0) {
+ eprintk(KERN_ERR,
+ "v9fs_trans_unix: problem connecting socket: %s: %d\n",
+ dev_name, rc);
+ return rc;
+ }
+ csocket->sk->sk_allocation = GFP_NOIO;
+
+ fd = sock_map_fd(csocket);
+ if (fd < 0) {
+ sock_release(csocket);
+ kfree(ts);
+ trans->priv = NULL;
+ return fd;
+ }
+
+ ts->s = csocket;
+ ts->filp = fget(fd);
+ ts->filp->f_flags |= O_NONBLOCK;
+ trans->status = Connected;
+
+ return 0;
+}
+
+/**
+ * v9fs_sock_close - shutdown socket
+ * @trans: private socket structure
+ *
+ */
+
+static void v9fs_sock_close(struct v9fs_transport *trans)
+{
+ struct v9fs_trans_sock *ts;
+
+ if (!trans)
+ return;
+
+ ts = trans->priv;
+
+ if ((ts) && (ts->filp)) {
+ fput(ts->filp);
+ ts->filp = NULL;
+ ts->s = NULL;
+ trans->status = Disconnected;
+ }
+
+ kfree(ts);
+
+ trans->priv = NULL;
+}
+
+struct v9fs_transport v9fs_trans_tcp = {
+ .init = v9fs_tcp_init,
+ .write = v9fs_sock_send,
+ .read = v9fs_sock_recv,
+ .close = v9fs_sock_close,
+ .poll = v9fs_sock_poll,
+};
+
+struct v9fs_transport v9fs_trans_unix = {
+ .init = v9fs_unix_init,
+ .write = v9fs_sock_send,
+ .read = v9fs_sock_recv,
+ .close = v9fs_sock_close,
+ .poll = v9fs_sock_poll,
+};
git://git.onelab.eu / linux-2.6.git / blobdiff