[PATCH] v9fs: consolidate trans_sock into trans_fd

Here is a new trans_fd.c that replaces the current trans_fd.c and
trans_sock.c.

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

1 files changed, 196 insertions, 101 deletions

diff --git a/fs/9p/trans_fd.c b/fs/9p/trans_fd.c
index 5b2ce21..8029844 100644
--- a/fs/9p/trans_fd.c
+++ b/fs/9p/trans_fd.c
@@ -1,10 +1,13 @@
 /*
  * linux/fs/9p/trans_fd.c
  *
- * File Descriptor Transport Layer
+ * Fd transport layer.  Includes deprecated socket layer.
  *
- *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
+ *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004-2005 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
@@ -25,6 +28,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/in.h>
 #include <linux/module.h>
 #include <linux/net.h>
 #include <linux/ipv6.h>
@@ -40,89 +44,119 @@
 #include "v9fs.h"
 #include "transport.h"
 
+#define V9FS_PORT 564
+
 struct v9fs_trans_fd {
-	struct file *in_file;
-	struct file *out_file;
+	struct file *rd;
+	struct file *wr;
 };
 
 /**
- * v9fs_fd_recv - receive from a socket
+ * v9fs_fd_read- read from a fd
  * @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)
+static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len)
 {
-	struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
+	int ret;
+	struct v9fs_trans_fd *ts;
 
-	if (!trans || trans->status != Connected || !ts)
-		return -EIO;
+	if (!trans || trans->status == Disconnected || !(ts = trans->priv))
+		return -EREMOTEIO;
 
-	return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
+	if (!(ts->rd->f_flags & O_NONBLOCK))
+		dprintk(DEBUG_ERROR, "blocking read ...\n");
+
+	ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
+	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+		trans->status = Disconnected;
+	return ret;
 }
 
 /**
- * v9fs_fd_send - send to a socket
+ * v9fs_fd_write - write 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)
+static int v9fs_fd_write(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;
+	int ret;
+	mm_segment_t oldfs;
+	struct v9fs_trans_fd *ts;
 
-	if (!trans || trans->status != Connected || !ts)
-		return -EIO;
+	if (!trans || trans->status == Disconnected || !(ts = trans->priv))
+		return -EREMOTEIO;
+
+	if (!(ts->wr->f_flags & O_NONBLOCK))
+		dprintk(DEBUG_ERROR, "blocking write ...\n");
 
 	oldfs = get_fs();
 	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);
+	ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
 	set_fs(oldfs);
 
+	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+		trans->status = Disconnected;
 	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)
+static unsigned int
+v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
 {
-	struct v9fs_trans_fd *ts = NULL;
-	struct v9fs_transport *trans = v9ses->transport;
+	int ret, n;
+	struct v9fs_trans_fd *ts;
+	mm_segment_t oldfs;
 
-	if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
-		printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
-		return -ENOPROTOOPT;
-	}
+	if (!trans || trans->status != Connected || !(ts = trans->priv))
+		return -EREMOTEIO;
 
-	ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
+	if (!ts->rd->f_op || !ts->rd->f_op->poll)
+		return -EIO;
 
-	if (!ts)
-		return -ENOMEM;
+	if (!ts->wr->f_op || !ts->wr->f_op->poll)
+		return -EIO;
 
-	ts->in_file = fget( v9ses->rfdno );
-	ts->out_file = fget( v9ses->wfdno );
+	oldfs = get_fs();
+	set_fs(get_ds());
 
-	if (!ts->in_file || !ts->out_file) {
-		if (ts->in_file)
-			fput(ts->in_file);
+	ret = ts->rd->f_op->poll(ts->rd, pt);
+	if (ret < 0)
+		goto end;
 
-		if (ts->out_file)
-			fput(ts->out_file);
+	if (ts->rd != ts->wr) {
+		n = ts->wr->f_op->poll(ts->wr, pt);
+		if (n < 0) {
+			ret = n;
+			goto end;
+		}
+		ret = (ret & ~POLLOUT) | (n & ~POLLIN);
+	}
 
+      end:
+	set_fs(oldfs);
+	return ret;
+}
+
+static int v9fs_fd_open(struct v9fs_session_info *v9ses, int rfd, int wfd)
+{
+	struct v9fs_transport *trans = v9ses->transport;
+	struct v9fs_trans_fd *ts = kmalloc(sizeof(struct v9fs_trans_fd),
+					   GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->rd = fget(rfd);
+	ts->wr = fget(wfd);
+	if (!ts->rd || !ts->wr) {
+		if (ts->rd)
+			fput(ts->rd);
+		if (ts->wr)
+			fput(ts->wr);
 		kfree(ts);
 		return -EIO;
 	}
@@ -133,84 +167,145 @@ v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
 	return 0;
 }
 
-
-/**
- * v9fs_fd_close - shutdown file descriptor
- * @trans: private socket structure
- *
- */
-
-static void v9fs_fd_close(struct v9fs_transport *trans)
+static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr,
+			char *data)
 {
-	struct v9fs_trans_fd *ts;
-
-	if (!trans)
-		return;
-
-	ts = xchg(&trans->priv, NULL);
+	if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) {
+		printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
+		return -ENOPROTOOPT;
+	}
 
-	if (!ts)
-		return;
+	return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno);
+}
 
-	trans->status = Disconnected;
-	if (ts->in_file)
-		fput(ts->in_file);
+static int v9fs_socket_open(struct v9fs_session_info *v9ses,
+			    struct socket *csocket)
+{
+	int fd, ret;
+
+	csocket->sk->sk_allocation = GFP_NOIO;
+	if ((fd = sock_map_fd(csocket)) < 0) {
+		eprintk(KERN_ERR, "v9fs_socket_open: failed to map fd\n");
+		ret = fd;
+	      release_csocket:
+		sock_release(csocket);
+		return ret;
+	}
 
-	if (ts->out_file)
-		fput(ts->out_file);
+	if ((ret = v9fs_fd_open(v9ses, fd, fd)) < 0) {
+		sockfd_put(csocket);
+		eprintk(KERN_ERR, "v9fs_socket_open: failed to open fd\n");
+		goto release_csocket;
+	}
 
-	kfree(ts);
+	((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |=
+	    O_NONBLOCK;
+	return 0;
 }
 
-static unsigned int
-v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
+static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr,
+			 char *data)
 {
-	int ret, n;
-	struct v9fs_trans_fd *ts;
-	mm_segment_t oldfs;
+	int ret;
+	struct socket *csocket = NULL;
+	struct sockaddr_in sin_server;
+
+	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);
+
+	if (!csocket) {
+		eprintk(KERN_ERR, "v9fs_trans_tcp: problem creating socket\n");
+		return -1;
+	}
 
-	if (!trans)
-		return -EIO;
+	ret = csocket->ops->connect(csocket,
+				    (struct sockaddr *)&sin_server,
+				    sizeof(struct sockaddr_in), 0);
+	if (ret < 0) {
+		eprintk(KERN_ERR,
+			"v9fs_trans_tcp: problem connecting socket to %s\n",
+			addr);
+		return ret;
+	}
 
-	ts = trans->priv;
-	if (trans->status != Connected || !ts)
-		return -EIO;
+	return v9fs_socket_open(v9ses, csocket);
+}
 
-	oldfs = get_fs();
-	set_fs(get_ds());
+static int
+v9fs_unix_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
+{
+	int ret;
+	struct socket *csocket;
+	struct sockaddr_un sun_server;
+
+	if (strlen(addr) > UNIX_PATH_MAX) {
+		eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
+			addr);
+		return -ENAMETOOLONG;
+	}
 
-	if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
-		ret = -EIO;
-		goto end;
+	sun_server.sun_family = PF_UNIX;
+	strcpy(sun_server.sun_path, addr);
+	sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
+	ret = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
+			sizeof(struct sockaddr_un) - 1, 0);
+	if (ret < 0) {
+		eprintk(KERN_ERR,
+			"v9fs_trans_unix: problem connecting socket: %s: %d\n",
+			addr, ret);
+		return ret;
 	}
 
-	ret = ts->in_file->f_op->poll(ts->in_file, pt);
+	return v9fs_socket_open(v9ses, csocket);
+}
 
-	if (ts->out_file != ts->in_file) {
-		if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
-			ret = -EIO;
-			goto end;
-		}
+/**
+ * v9fs_sock_close - shutdown socket
+ * @trans: private socket structure
+ *
+ */
+static void v9fs_fd_close(struct v9fs_transport *trans)
+{
+	struct v9fs_trans_fd *ts;
 
-		n = ts->out_file->f_op->poll(ts->out_file, pt);
+	if (!trans)
+		return;
 
-		ret &= ~POLLOUT;
-		n &= ~POLLIN;
+	ts = xchg(&trans->priv, NULL);
 
-		ret |= n;
-	}
+	if (!ts)
+		return;
 
-end:
-	set_fs(oldfs);
-	return ret;
+	trans->status = Disconnected;
+	if (ts->rd)
+		fput(ts->rd);
+	if (ts->wr)
+		fput(ts->wr);
+	kfree(ts);
 }
 
-
 struct v9fs_transport v9fs_trans_fd = {
 	.init = v9fs_fd_init,
-	.write = v9fs_fd_send,
-	.read = v9fs_fd_recv,
+	.write = v9fs_fd_write,
+	.read = v9fs_fd_read,
 	.close = v9fs_fd_close,
 	.poll = v9fs_fd_poll,
 };
 
+struct v9fs_transport v9fs_trans_tcp = {
+	.init = v9fs_tcp_init,
+	.write = v9fs_fd_write,
+	.read = v9fs_fd_read,
+	.close = v9fs_fd_close,
+	.poll = v9fs_fd_poll,
+};
+
+struct v9fs_transport v9fs_trans_unix = {
+	.init = v9fs_unix_init,
+	.write = v9fs_fd_write,
+	.read = v9fs_fd_read,
+	.close = v9fs_fd_close,
+	.poll = v9fs_fd_poll,
+};