[PATCH] v9fs: transport modules

This part of the patch contains transport routines.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 282 insertions, 0 deletions

diff --git a/fs/9p/trans_sock.c b/fs/9p/trans_sock.c
new file mode 100644
index 000000000000..081d1c847803
--- /dev/null
+++ b/fs/9p/trans_sock.c
@@ -0,0 +1,282 @@
+/*
+ * linux/fs/9p/trans_socket.c
+ *
+ * Socket Transport Layer
+ *
+ *  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/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 "debug.h"
+#include "v9fs.h"
+#include "transport.h"
+
+#define V9FS_PORT 564
+
+struct v9fs_trans_sock {
+        struct socket *s;
+};
+
+/**
+ * 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)
+{
+        struct msghdr msg;
+        struct kvec iov;
+        int result;
+        mm_segment_t oldfs;
+        struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+
+        if (trans->status == Disconnected)
+                return -EREMOTEIO;
+
+        result = -EINVAL;
+
+        oldfs = get_fs();
+        set_fs(get_ds());
+
+        iov.iov_base = v;
+        iov.iov_len = len;
+        msg.msg_name = NULL;
+        msg.msg_namelen = 0;
+        msg.msg_iovlen = 1;
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+        msg.msg_namelen = 0;
+        msg.msg_flags = MSG_NOSIGNAL;
+
+        result = kernel_recvmsg(ts->s, &msg, &iov, 1, len, 0);
+
+        dprintk(DEBUG_TRANS, "socket state %d\n", ts->s->state);
+        set_fs(oldfs);
+
+        if (result <= 0) {
+                if (result != -ERESTARTSYS)
+                        trans->status = Disconnected;
+        }
+
+        return result;
+}
+
+/**
+ * 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)
+{
+        struct kvec iov;
+        struct msghdr msg;
+        int result = -1;
+        mm_segment_t oldfs;
+        struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+
+        dprintk(DEBUG_TRANS, "Sending packet size %d (%x)\n", len, len);
+        dump_data(v, len);
+
+        down(&trans->writelock);
+
+        oldfs = get_fs();
+        set_fs(get_ds());
+        iov.iov_base = v;
+        iov.iov_len = len;
+        msg.msg_name = NULL;
+        msg.msg_namelen = 0;
+        msg.msg_iovlen = 1;
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+        msg.msg_namelen = 0;
+        msg.msg_flags = MSG_NOSIGNAL;
+        result = kernel_sendmsg(ts->s, &msg, &iov, 1, len);
+        set_fs(oldfs);
+
+        if (result < 0) {
+                if (result != -ERESTARTSYS)
+                        trans->status = Disconnected;
+        }
+
+        up(&trans->writelock);
+        return result;
+}
+
+/**
+ * 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;
+
+        sema_init(&trans->writelock, 1);
+        sema_init(&trans->readlock, 1);
+
+        ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
+
+        if (!ts)
+                return -ENOMEM;
+
+        trans->priv = ts;
+        ts->s = 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;
+        ts->s = csocket;
+        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;
+        struct socket *csocket;
+        struct sockaddr_un sun_server;
+        struct v9fs_transport *trans;
+        struct v9fs_trans_sock *ts;
+
+        rc = 0;
+        csocket = NULL;
+        trans = v9ses->transport;
+
+        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;
+
+        sema_init(&trans->writelock, 1);
+        sema_init(&trans->readlock, 1);
+
+        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;
+        ts->s = csocket;
+        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 = trans ? trans->priv : NULL;
+
+        if ((ts) && (ts->s)) {
+                dprintk(DEBUG_TRANS, "closing the socket %p\n", ts->s);
+                sock_release(ts->s);
+                ts->s = NULL;
+                trans->status = Disconnected;
+                dprintk(DEBUG_TRANS, "socket closed\n");
+        }
+
+        kfree(ts);
+}
+
+struct v9fs_transport v9fs_trans_tcp = {
+        .init = v9fs_tcp_init,
+        .write = v9fs_sock_send,
+        .read = v9fs_sock_recv,
+        .close = v9fs_sock_close,
+};
+
+struct v9fs_transport v9fs_trans_unix = {
+        .init = v9fs_unix_init,
+        .write = v9fs_sock_send,
+        .read = v9fs_sock_recv,
+        .close = v9fs_sock_close,
+};