/*
* 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>
*
* 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.
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
*
*/
-#include <linux/config.h>
+#include <linux/in.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/ipv6.h>
#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;
}
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,
+};
git://git.onelab.eu / linux-2.6.git / blobdiff