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Commit 426cc91a authored by Eric Van Hensbergen's avatar Eric Van Hensbergen Committed by Linus Torvalds
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[PATCH] v9fs: transport modules



This part of the patch contains transport routines.

Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: default avatarLatchesar Ionkov <lucho@ionkov.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b8cf945b
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fs/9p/mux.c

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/*
 * linux/fs/9p/mux.c
 *
 * Protocol Multiplexer
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
 *
 *  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/errno.h>
#include <linux/fs.h>
#include <linux/kthread.h>
#include <linux/idr.h>

#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "transport.h"
#include "conv.h"
#include "mux.h"

/**
 * dprintcond - print condition of session info
 * @v9ses: session info structure
 * @req: RPC request structure
 *
 */

static inline int
dprintcond(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
{
	dprintk(DEBUG_MUX, "condition: %d, %p\n", v9ses->transport->status,
		req->rcall);
	return 0;
}

/**
 * xread - force read of a certain number of bytes
 * @v9ses: session info structure
 * @ptr: pointer to buffer
 * @sz: number of bytes to read
 *
 * Chuck Cranor CS-533 project1
 */

static int xread(struct v9fs_session_info *v9ses, void *ptr, unsigned long sz)
{
	int rd = 0;
	int ret = 0;
	while (rd < sz) {
		ret = v9ses->transport->read(v9ses->transport, ptr, sz - rd);
		if (ret <= 0) {
			dprintk(DEBUG_ERROR, "xread errno %d\n", ret);
			return ret;
		}
		rd += ret;
		ptr += ret;
	}
	return (rd);
}

/**
 * read_message - read a full 9P2000 fcall packet
 * @v9ses: session info structure
 * @rcall: fcall structure to read into
 * @rcalllen: size of fcall buffer
 *
 */

static int
read_message(struct v9fs_session_info *v9ses,
	     struct v9fs_fcall *rcall, int rcalllen)
{
	unsigned char buf[4];
	void *data;
	int size = 0;
	int res = 0;

	res = xread(v9ses, buf, sizeof(buf));
	if (res < 0) {
		dprintk(DEBUG_ERROR,
			"Reading of count field failed returned: %d\n", res);
		return res;
	}

	if (res < 4) {
		dprintk(DEBUG_ERROR,
			"Reading of count field failed returned: %d\n", res);
		return -EIO;
	}

	size = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
	dprintk(DEBUG_MUX, "got a packet count: %d\n", size);

	/* adjust for the four bytes of size */
	size -= 4;

	if (size > v9ses->maxdata) {
		dprintk(DEBUG_ERROR, "packet too big: %d\n", size);
		return -E2BIG;
	}

	data = kmalloc(size, GFP_KERNEL);
	if (!data) {
		eprintk(KERN_WARNING, "out of memory\n");
		return -ENOMEM;
	}

	res = xread(v9ses, data, size);
	if (res < size) {
		dprintk(DEBUG_ERROR, "Reading of fcall failed returned: %d\n",
			res);
		kfree(data);
		return res;
	}

	/* we now have an in-memory string that is the reply.
	 * deserialize it. There is very little to go wrong at this point
	 * save for v9fs_alloc errors.
	 */
	res = v9fs_deserialize_fcall(v9ses, size, data, v9ses->maxdata,
				     rcall, rcalllen);

	kfree(data);

	if (res < 0)
		return res;

	return 0;
}

/**
 * v9fs_recv - receive an RPC response for a particular tag
 * @v9ses: session info structure
 * @req: RPC request structure
 *
 */

static int v9fs_recv(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
{
	int ret = 0;

	dprintk(DEBUG_MUX, "waiting for response: %d\n", req->tcall->tag);
	ret = wait_event_interruptible(v9ses->read_wait,
		       ((v9ses->transport->status != Connected) ||
			(req->rcall != 0) || dprintcond(v9ses, req)));

	dprintk(DEBUG_MUX, "got it: rcall %p\n", req->rcall);
	if (v9ses->transport->status == Disconnected)
		return -ECONNRESET;

	if (ret == 0) {
		spin_lock(&v9ses->muxlock);
		list_del(&req->next);
		spin_unlock(&v9ses->muxlock);
	}

	return ret;
}

/**
 * v9fs_send - send a 9P request
 * @v9ses: session info structure
 * @req: RPC request to send
 *
 */

static int v9fs_send(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
{
	int ret = -1;
	void *data = NULL;
	struct v9fs_fcall *tcall = req->tcall;

	data = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	tcall->size = 0;	/* enforce size recalculation */
	ret =
	    v9fs_serialize_fcall(v9ses, tcall, data,
				 v9ses->maxdata + V9FS_IOHDRSZ);
	if (ret < 0)
		goto free_data;

	spin_lock(&v9ses->muxlock);
	list_add(&req->next, &v9ses->mux_fcalls);
	spin_unlock(&v9ses->muxlock);

	dprintk(DEBUG_MUX, "sending message: tag %d size %d\n", tcall->tag,
		tcall->size);
	ret = v9ses->transport->write(v9ses->transport, data, tcall->size);

	if (ret != tcall->size) {
		spin_lock(&v9ses->muxlock);
		list_del(&req->next);
		kfree(req->rcall);

		spin_unlock(&v9ses->muxlock);
		if (ret >= 0)
			ret = -EREMOTEIO;
	} else
		ret = 0;

      free_data:
	kfree(data);
	return ret;
}

/**
 * v9fs_mux_rpc - send a request, receive a response
 * @v9ses: session info structure
 * @tcall: fcall to send
 * @rcall: buffer to place response into
 *
 */

long
v9fs_mux_rpc(struct v9fs_session_info *v9ses, struct v9fs_fcall *tcall,
	     struct v9fs_fcall **rcall)
{
	int tid = -1;
	struct v9fs_fcall *fcall = NULL;
	struct v9fs_rpcreq req;
	int ret = -1;

	if (!v9ses)
		return -EINVAL;

	if (rcall)
		*rcall = NULL;

	if (tcall->id != TVERSION) {
		tid = v9fs_get_idpool(&v9ses->tidpool);
		if (tid < 0)
			return -ENOMEM;
	}

	tcall->tag = tid;

	req.tcall = tcall;
	req.rcall = NULL;

	ret = v9fs_send(v9ses, &req);

	if (ret < 0) {
		if (tcall->id != TVERSION)
			v9fs_put_idpool(tid, &v9ses->tidpool);
		dprintk(DEBUG_MUX, "error %d\n", ret);
		return ret;
	}

	ret = v9fs_recv(v9ses, &req);

	fcall = req.rcall;

	dprintk(DEBUG_MUX, "received: tag=%x, ret=%d\n", tcall->tag, ret);
	if (ret == -ERESTARTSYS) {
		if (v9ses->transport->status != Disconnected
		    && tcall->id != TFLUSH) {
			unsigned long flags;

			dprintk(DEBUG_MUX, "flushing the tag: %d\n",
				tcall->tag);
			clear_thread_flag(TIF_SIGPENDING);
			v9fs_t_flush(v9ses, tcall->tag);
			spin_lock_irqsave(&current->sighand->siglock, flags);
			recalc_sigpending();
			spin_unlock_irqrestore(&current->sighand->siglock,
					       flags);
			dprintk(DEBUG_MUX, "flushing done\n");
		}

		goto release_req;
	} else if (ret < 0)
		goto release_req;

	if (!fcall)
		ret = -EIO;
	else {
		if (fcall->id == RERROR) {
			ret = v9fs_errstr2errno(fcall->params.rerror.error);
			if (ret == 0) {	/* string match failed */
				if (fcall->params.rerror.errno)
					ret = -(fcall->params.rerror.errno);
				else
					ret = -ESERVERFAULT;
			}
		} else if (fcall->id != tcall->id + 1) {
			dprintk(DEBUG_ERROR,
				"fcall mismatch: expected %d, got %d\n",
				tcall->id + 1, fcall->id);
			ret = -EIO;
		}
	}

      release_req:
	if (tcall->id != TVERSION)
		v9fs_put_idpool(tid, &v9ses->tidpool);
	if (rcall)
		*rcall = fcall;
	else
		kfree(fcall);

	return ret;
}

/**
 * v9fs_recvproc - kproc to handle demultiplexing responses
 * @data: session info structure
 *
 */

static int v9fs_recvproc(void *data)
{
	struct v9fs_session_info *v9ses = (struct v9fs_session_info *)data;
	struct v9fs_fcall *rcall = NULL;
	struct v9fs_rpcreq *rptr;
	struct v9fs_rpcreq *req;
	struct v9fs_rpcreq *rreq;
	int err = 0;

	allow_signal(SIGKILL);
	set_current_state(TASK_INTERRUPTIBLE);
	complete(&v9ses->proccmpl);
	while (!kthread_should_stop() && err >= 0) {
		req = rptr = rreq = NULL;

		rcall = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
		if (!rcall) {
			eprintk(KERN_ERR, "no memory for buffers\n");
			break;
		}

		err = read_message(v9ses, rcall, v9ses->maxdata + V9FS_IOHDRSZ);
		if (err < 0) {
			kfree(rcall);
			break;
		}
		spin_lock(&v9ses->muxlock);
		list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
			if (rreq->tcall->tag == rcall->tag) {
				req = rreq;
				req->rcall = rcall;
				break;
			}
		}

		if (req && (req->tcall->id == TFLUSH)) {
			struct v9fs_rpcreq *treq = NULL;
			list_for_each_entry_safe(treq, rptr, &v9ses->mux_fcalls, next) {
				if (treq->tcall->tag ==
				    req->tcall->params.tflush.oldtag) {
					list_del(&rptr->next);
					kfree(treq->rcall);
					break;
				}
			}
		}

		spin_unlock(&v9ses->muxlock);

		if (!req) {
			dprintk(DEBUG_ERROR,
				"unexpected response: id %d tag %d\n",
				rcall->id, rcall->tag);

			kfree(rcall);
		}

		wake_up_all(&v9ses->read_wait);
		set_current_state(TASK_INTERRUPTIBLE);
	}

	/* Inform all pending processes about the failure */
	wake_up_all(&v9ses->read_wait);

	if (signal_pending(current))
		complete(&v9ses->proccmpl);

	dprintk(DEBUG_MUX, "recvproc: end\n");
	v9ses->recvproc = NULL;

	return err >= 0;
}

/**
 * v9fs_mux_init - initialize multiplexer (spawn kproc)
 * @v9ses: session info structure
 * @dev_name: mount device information (to create unique kproc)
 *
 */

int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name)
{
	char procname[60];

	strncpy(procname, dev_name, sizeof(procname));
	procname[sizeof(procname) - 1] = 0;

	init_waitqueue_head(&v9ses->read_wait);
	init_completion(&v9ses->fcread);
	init_completion(&v9ses->proccmpl);
	spin_lock_init(&v9ses->muxlock);
	INIT_LIST_HEAD(&v9ses->mux_fcalls);
	v9ses->recvproc = NULL;
	v9ses->curfcall = NULL;

	v9ses->recvproc = kthread_create(v9fs_recvproc, v9ses,
					 "v9fs_recvproc %s", procname);

	if (IS_ERR(v9ses->recvproc)) {
		eprintk(KERN_ERR, "cannot create receiving thread\n");
		v9fs_session_close(v9ses);
		return -ECONNABORTED;
	}

	wake_up_process(v9ses->recvproc);
	wait_for_completion(&v9ses->proccmpl);

	return 0;
}

fs/9p/mux.h

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/*
 * linux/fs/9p/mux.h
 *
 * Multiplexer Definitions
 *
 *  Copyright (C) 2004 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 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
 *
 */

/* structure to manage each RPC transaction */

struct v9fs_rpcreq {
	struct v9fs_fcall *tcall;
	struct v9fs_fcall *rcall;

	/* XXX - could we put scatter/gather buffers here? */

	struct list_head next;
};

int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name);
long v9fs_mux_rpc(struct v9fs_session_info *v9ses,
		  struct v9fs_fcall *tcall, struct v9fs_fcall **rcall);

fs/9p/trans_fd.c

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/*
 * linux/fs/9p/trans_fd.c
 *
 * File Descriptor Transport Layer
 *
 *  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 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 <linux/file.h>

#include "debug.h"
#include "v9fs.h"
#include "transport.h"

struct v9fs_trans_fd {
	struct file *in_file;
	struct file *out_file;
};

/**
 * 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_recv(struct v9fs_transport *trans, void *v, int len)
{
	struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;

	if (!trans || trans->status != Connected || !ts)
		return -EIO;

	return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
}

/**
 * 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_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 (!trans || trans->status != Connected || !ts)
		return -EIO;

	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);
	set_fs(oldfs);

	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)
{
	struct v9fs_trans_fd *ts = NULL;
	struct v9fs_transport *trans = v9ses->transport;

	if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
		printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
		return -ENOPROTOOPT;
	}

	sema_init(&trans->writelock, 1);
	sema_init(&trans->readlock, 1);

	ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);

	if (!ts)
		return -ENOMEM;

	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;
	}

	trans->priv = ts;
	trans->status = Connected;

	return 0;
}


/**
 * v9fs_fd_close - shutdown file descriptor
 * @trans: private socket structure
 *
 */

static void v9fs_fd_close(struct v9fs_transport *trans)
{
	struct v9fs_trans_fd *ts;

	if (!trans)
		return;

	trans->status = Disconnected;
	ts = trans->priv;

	if (!ts)
		return;

	if (ts->in_file)
		fput(ts->in_file);

	if (ts->out_file)
		fput(ts->out_file);

	kfree(ts);
}

struct v9fs_transport v9fs_trans_fd = {
	.init = v9fs_fd_init,
	.write = v9fs_fd_send,
	.read = v9fs_fd_recv,
	.close = v9fs_fd_close,
};

fs/9p/trans_sock.c

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/*
 * 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,
};

fs/9p/transport.h

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Original line number Diff line number Diff line
/*
 * linux/fs/9p/transport.h
 *
 * Transport Definition
 *
 *  Copyright (C) 2004 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 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
 *
 */

enum v9fs_transport_status {
	Connected,
	Disconnected,
	Hung,
};

struct v9fs_transport {
	enum v9fs_transport_status status;
	struct semaphore writelock;
	struct semaphore readlock;
	void *priv;

	int (*init) (struct v9fs_session_info *, const char *, char *);
	int (*write) (struct v9fs_transport *, void *, int);
	int (*read) (struct v9fs_transport *, void *, int);
	void (*close) (struct v9fs_transport *);
};

extern struct v9fs_transport v9fs_trans_tcp;
extern struct v9fs_transport v9fs_trans_unix;
extern struct v9fs_transport v9fs_trans_fd;
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