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Subject[RFC][PATCH 6/7] v9fs: transport modules (2.0-rc7)
This is part [6/7] of the v9fs-2.0-rc7 patch against Linux 2.6.

This part of the patch contains transport routines.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>


----------

mux.c | 437 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mux.h | 37 ++++
trans_sock.c | 272 ++++++++++++++++++++++++++++++++++++
transport.h | 42 +++++
4 files changed, 788 insertions(+)

----------

Index: fs/9p/mux.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/mux.h (mode:100644)
@@ -0,0 +1,37 @@
+/*
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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);
Index: fs/9p/mux.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/mux.c (mode:100644)
@@ -0,0 +1,437 @@
+/*
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/kthread.h>
+
+#include "debug.h"
+#include "idpool.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;
+ int readnum = 0;
+ while (rd < sz) {
+ ret = v9ses->transport->read(v9ses->transport, ptr, sz - rd);
+ readnum++;
+ if (ret <= 0) {
+ dprintk(DEBUG_ERROR,
+ "xread on ses %p, at try %d: want %ld, got %d, errno %d\n",
+ v9ses, readnum, sz, rd, 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 structure
+ *
+ */
+
+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); /* XXX */
+
+ /* 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(v9ses->maxdata, GFP_KERNEL);
+ if (!buf) {
+ 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 -ENOMEM;
+
+ 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);
+
+ tcall->size = 0; /* enforce size recalculation */
+ ret = v9fs_serialize_fcall(v9ses, tcall, data, v9ses->maxdata+V9FS_IOHDRSZ);
+ if (ret == 0) {
+ ret = -ENOMEM;
+ 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);
+ if (req->rcall)
+ 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 (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) {
+ 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;
+ }
+
+ 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:
+ 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 list_head *rptr;
+ struct list_head *rrptr;
+ struct v9fs_rpcreq *req = NULL;
+ int err = 0;
+
+ allow_signal(SIGKILL);
+ set_current_state(TASK_INTERRUPTIBLE);
+ complete(&v9ses->proccmpl);
+ while (!kthread_should_stop() && err >= 0) {
+ rcall = kmalloc(v9ses->maxdata+V9FS_IOHDRSZ, GFP_KERNEL);
+ dprintk(DEBUG_MUX, "waiting for message\n");
+ err = read_message(v9ses, rcall, v9ses->maxdata+V9FS_IOHDRSZ);
+ if (err < 0) {
+ kfree( rcall);
+ break;
+ }
+
+ spin_lock(&v9ses->muxlock);
+ list_for_each_safe(rptr, rrptr, &v9ses->mux_fcalls) {
+ struct v9fs_rpcreq *rreq =
+ list_entry(rptr, struct v9fs_rpcreq, next);
+
+ if (rreq->tcall->tag == rcall->tag) {
+ req = rreq;
+ req->rcall = rcall;
+ break;
+ }
+ }
+
+ if (req && (req->tcall->id == TFLUSH)) {
+ list_for_each_safe(rptr, rrptr, &v9ses->mux_fcalls) {
+ struct v9fs_rpcreq *treq =
+ list_entry(rptr, struct v9fs_rpcreq, next);
+
+ if (treq->tcall->tag ==
+ req->tcall->params.tflush.oldtag) {
+ list_del(rptr);
+ if (treq->rcall)
+ 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;
+}
Index: fs/9p/transport.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/transport.h (mode:100644)
@@ -0,0 +1,42 @@
+/*
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+enum v9fs_transport_status {
+ Connected,
+ Disconnected,
+};
+
+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;
Index: fs/9p/trans_sock.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/trans_sock.c (mode:100644)
@@ -0,0 +1,272 @@
+/*
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "debug.h"
+#include "idpool.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
+ * @trans: private socket structure for mount
+ * @dev_name: mount target
+ * @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
+ * @trans: private socket info
+ * @dev_name: mount target
+ * @data: mount options
+ *
+ */
+
+static int
+v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
+ char *data)
+{
+ struct socket *csocket = NULL;
+ struct sockaddr_un sun_server;
+ struct v9fs_transport *trans = v9ses->transport;
+ int rc = 0;
+
+ struct v9fs_trans_sock *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), 0);
+ 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,
+};
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