[PATCH] v9fs: transport modules (426cc91a) · Commits · e / devices / android_kernel_fairphone_FP5

fs/9p/mux.c

0 → 100644

+440 −0

Original line number	Diff line number	Diff line
		/*
		* 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

0 → 100644

+39 −0

Original line number	Diff line number	Diff line
		/*
		* 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

0 → 100644

+172 −0

Original line number	Diff line number	Diff line
		/*
		* 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

0 → 100644

+282 −0

Original line number	Diff line number	Diff line
		/*
		* 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

0 → 100644

+46 −0

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;