/*
* linux/fs/9p/trans_fd.c
*
- * Fd transport layer. Includes deprecated socket layer.
+ * File Descriptor Transport Layer
*
- * 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) 2005 by Latchesar Ionkov <lucho@ionkov.net>
+ * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
+ * 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
*
*/
-#include <linux/in.h>
+#include <linux/config.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 *rd;
- struct file *wr;
+ struct file *in_file;
+ struct file *out_file;
};
/**
- * v9fs_fd_read- read from a fd
+ * v9fs_fd_recv - receive from a socket
* @v9ses: session information
* @v: buffer to receive data into
* @len: size of receive buffer
*
*/
-static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len)
-{
- int ret;
- struct v9fs_trans_fd *ts;
- if (!trans || trans->status == Disconnected || !(ts = trans->priv))
- return -EREMOTEIO;
+static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len)
+{
+ struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
- if (!(ts->rd->f_flags & O_NONBLOCK))
- dprintk(DEBUG_ERROR, "blocking read ...\n");
+ if (!trans || trans->status != Connected || !ts)
+ return -EIO;
- ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
- if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
- trans->status = Disconnected;
- return ret;
+ return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
}
/**
- * v9fs_fd_write - write to a socket
+ * v9fs_fd_send - send to a socket
* @v9ses: session information
* @v: buffer to send data from
* @len: size of send buffer
*
*/
-static int v9fs_fd_write(struct v9fs_transport *trans, void *v, int len)
-{
- int ret;
- mm_segment_t oldfs;
- struct v9fs_trans_fd *ts;
- if (!trans || trans->status == Disconnected || !(ts = trans->priv))
- return -EREMOTEIO;
+static int v9fs_fd_send(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;
- if (!(ts->wr->f_flags & O_NONBLOCK))
- dprintk(DEBUG_ERROR, "blocking write ...\n");
+ if (!trans || trans->status != Connected || !ts)
+ return -EIO;
oldfs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
- ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
+ ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos);
set_fs(oldfs);
- if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
- trans->status = Disconnected;
return ret;
}
-static unsigned int
-v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
-{
- int ret, n;
- struct v9fs_trans_fd *ts;
- mm_segment_t oldfs;
-
- if (!trans || trans->status != Connected || !(ts = trans->priv))
- return -EREMOTEIO;
-
- if (!ts->rd->f_op || !ts->rd->f_op->poll)
- return -EIO;
-
- if (!ts->wr->f_op || !ts->wr->f_op->poll)
- return -EIO;
-
- oldfs = get_fs();
- set_fs(get_ds());
+/**
+ * v9fs_fd_init - initialize file descriptor transport
+ * @v9ses: session information
+ * @addr: address of server to mount
+ * @data: mount options
+ *
+ */
- ret = ts->rd->f_op->poll(ts->rd, pt);
- if (ret < 0)
- goto end;
+static int
+v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
+{
+ struct v9fs_trans_fd *ts = NULL;
+ struct v9fs_transport *trans = v9ses->transport;
- 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);
+ if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
+ printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
+ return -ENOPROTOOPT;
}
- end:
- set_fs(oldfs);
- return ret;
-}
+ ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
-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);
+ ts->in_file = fget( v9ses->rfdno );
+ ts->out_file = fget( v9ses->wfdno );
+
+ if (!ts->in_file || !ts->out_file) {
+ if (ts->in_file)
+ fput(ts->in_file);
+
+ if (ts->out_file)
+ fput(ts->out_file);
+
kfree(ts);
return -EIO;
}
return 0;
}
-static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr,
- char *data)
-{
- if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) {
- printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
- return -ENOPROTOOPT;
- }
-
- return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno);
-}
-
-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 ((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;
- }
-
- ((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |=
- O_NONBLOCK;
- return 0;
-}
-
-static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr,
- char *data)
-{
- 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;
- }
-
- 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;
- }
-
- return v9fs_socket_open(v9ses, csocket);
-}
-
-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;
- }
-
- 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;
- }
-
- return v9fs_socket_open(v9ses, csocket);
-}
/**
- * v9fs_sock_close - shutdown socket
+ * v9fs_fd_close - shutdown file descriptor
* @trans: private socket structure
*
*/
+
static void v9fs_fd_close(struct v9fs_transport *trans)
{
struct v9fs_trans_fd *ts;
return;
trans->status = Disconnected;
- if (ts->rd)
- fput(ts->rd);
- if (ts->wr)
- fput(ts->wr);
+ if (ts->in_file)
+ fput(ts->in_file);
+
+ if (ts->out_file)
+ fput(ts->out_file);
+
kfree(ts);
}
+static unsigned int
+v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
+{
+ int ret, n;
+ struct v9fs_trans_fd *ts;
+ mm_segment_t oldfs;
+
+ if (!trans)
+ return -EIO;
+
+ ts = trans->priv;
+ if (trans->status != Connected || !ts)
+ return -EIO;
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+
+ if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ ret = ts->in_file->f_op->poll(ts->in_file, pt);
+
+ if (ts->out_file != ts->in_file) {
+ if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ n = ts->out_file->f_op->poll(ts->out_file, pt);
+
+ ret &= ~POLLOUT;
+ n &= ~POLLIN;
+
+ ret |= n;
+ }
+
+end:
+ set_fs(oldfs);
+ return ret;
+}
+
+
struct v9fs_transport v9fs_trans_fd = {
.init = v9fs_fd_init,
- .write = v9fs_fd_write,
- .read = v9fs_fd_read,
+ .write = v9fs_fd_send,
+ .read = v9fs_fd_recv,
.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