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Message-ID: <20070930224233.GE25590@ionkov.net>
Date: Sun, 30 Sep 2007 16:42:33 -0600
From: Latchesar Ionkov <lucho@...kov.net>
To: v9fs-developer@...ts.sourceforge.net
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
ericvh@...il.com
Subject: [RFC][PATCH 5/6] 9p: 9P server TCP socket connection support
This patchset provides support for in-kernel 9P2000 servers.
Support for 9P servers listening on TCP sockets.
Signed-off-by: Latchesar Ionkov <lucho@...kov.net>
---
net/9p/srv/socksrv.c | 252 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 252 insertions(+), 0 deletions(-)
create mode 100644 net/9p/srv/socksrv.c
diff --git a/net/9p/srv/socksrv.c b/net/9p/srv/socksrv.c
new file mode 100644
index 0000000..c304b91
--- /dev/null
+++ b/net/9p/srv/socksrv.c
@@ -0,0 +1,252 @@
+/*
+ * net/9p/srv/socksrv.c
+ *
+ * 9P Socket Server
+ *
+ * Copyright (C) 2007 by Latchesar Ionkov <lucho@...kov.net>
+ *
+ * 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.
+ *
+ * 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/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/kthread.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/parser.h>
+#include <net/tcp.h>
+#include <net/sock.h>
+#include <net/9p/9p.h>
+#include <net/9p/transport.h>
+#include <net/9p/srv.h>
+#include "srvimpl.h"
+
+struct p9srv_socksrv {
+ struct sockaddr_in saddr;
+ struct socket *sock;
+ struct p9srv *srv;
+ struct work_struct wq;
+};
+
+void (*p9srv_socksrv_dr_save)(struct sock *sock, int count);
+
+static void p9srv_socksrv_start(struct p9srv *);
+static void p9srv_socksrv_stop(struct p9srv *);
+static void p9srv_socksrv_destroy(struct p9srv *);
+static void p9srv_socksrv_data_ready(struct sock *sock, int count);
+static void p9srv_socksrv_accept(struct work_struct *work);
+
+struct p9srv *p9srv_socksrv_create(int port)
+{
+ int n, err;
+ struct p9srv_socksrv *ss;
+ struct p9srv *srv;
+
+ srv = NULL;
+ ss = kmalloc(sizeof(struct p9srv_socksrv), GFP_KERNEL);
+ if (!ss)
+ return ERR_PTR(-ENOMEM);
+
+ ss->sock = NULL;
+ err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &ss->sock);
+ if (!ss->sock) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "cannot create socket %d\n", err);
+ goto error;
+ }
+
+ n = 1;
+ ss->saddr.sin_family = AF_INET;
+ memset(&ss->saddr.sin_zero, 0, sizeof(ss->saddr.sin_zero));
+ ss->saddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ ss->saddr.sin_port = htons(port);
+ err = ss->sock->ops->bind(ss->sock, (struct sockaddr *) &ss->saddr,
+ sizeof(ss->saddr));
+ if (err < 0) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "cannot create bind %d\n", err);
+ goto error;
+ }
+
+ err = kernel_setsockopt(ss->sock, SOL_SOCKET, SO_REUSEADDR, (char *) &n,
+ sizeof(n));
+ if (err < 0) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "cannot create setsockopt\n");
+ goto error;
+ }
+
+ srv = p9srv_srv_create();
+ if (!srv) {
+ err = PTR_ERR(srv);
+ srv = NULL;
+ goto error;
+ }
+
+ ss->srv = srv;
+ INIT_WORK(&ss->wq, p9srv_socksrv_accept);
+ srv->srvaux = ss;
+ srv->start = p9srv_socksrv_start;
+ srv->stop = p9srv_socksrv_stop;
+ srv->destroy = p9srv_socksrv_destroy;
+
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "server %p on port %d created\n",
+ srv, port);
+ return srv;
+
+error:
+ if (ss->sock)
+ sock_release(ss->sock);
+
+ if (srv)
+ p9srv_srv_destroy(srv);
+
+ kfree(ss);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9srv_socksrv_create);
+
+static void p9srv_socksrv_start(struct p9srv *srv)
+{
+ int err;
+ struct p9srv_socksrv *ss;
+
+ ss = srv->srvaux;
+ err = ss->sock->ops->listen(ss->sock, 5);
+ if (err < 0) {
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "cannot listen %d\n", err);
+ return;
+ }
+
+ p9srv_socksrv_dr_save = ss->sock->sk->sk_data_ready;
+ ss->sock->sk->sk_data_ready = p9srv_socksrv_data_ready;
+ ss->sock->sk->sk_user_data = srv;
+}
+
+static void p9srv_socksrv_stop(struct p9srv *srv)
+{
+ struct p9srv_socksrv *ss;
+
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "srv %p\n", srv);
+ ss = srv->srvaux;
+ if (ss->sock) {
+ ss->sock->ops->shutdown(ss->sock, 2);
+ sock_release(ss->sock);
+ ss->sock = NULL;
+ }
+
+ ss->sock = NULL;
+}
+
+static void p9srv_socksrv_destroy(struct p9srv *srv)
+{
+ struct p9srv_socksrv *ss;
+
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "srv %p\n", srv);
+ ss = srv->srvaux;
+ if (ss->sock) {
+ ss->sock->ops->shutdown(ss->sock, 2);
+ sock_release(ss->sock);
+ ss->sock = NULL;
+ }
+
+ kfree(ss);
+}
+
+static void p9srv_socksrv_data_ready(struct sock *sock, int count)
+{
+ struct p9srv *srv;
+ struct p9srv_socksrv *ss;
+
+ srv = sock->sk_user_data;
+ if (!srv) {
+ (*p9srv_socksrv_dr_save)(sock, count);
+ return;
+ }
+
+ ss = srv->srvaux;
+ queue_work(p9srv_wq, &ss->wq);
+}
+
+static void p9srv_socksrv_accept(struct work_struct *work)
+{
+ int err, fd;
+ struct p9srv *srv;
+ struct p9srv_socksrv *ss;
+ struct socket *sock;
+ struct p9_trans *trans;
+ struct p9srv_conn *conn;
+ struct p9_trans_module *tmod;
+ substring_t tname;
+ char buf[64];
+
+ ss = container_of(work, struct p9srv_socksrv, wq);
+ srv = ss->srv;
+ P9_DPRINTK(P9SRV_DEBUG_SRV, "srv %p\n", srv);
+
+ tname.from = "fd";
+ tname.to = tname.from + strlen(tname.from);
+ tmod = v9fs_match_trans(&tname);
+ if (!tmod) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: fd transport not registered\n");
+ return;
+ }
+
+ err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (!sock) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: cannot create socket %d\n", err);
+ return;
+ }
+
+ sock->type = ss->sock->type;
+ sock->ops = ss->sock->ops;
+ err = ss->sock->ops->accept(ss->sock, sock, 0);
+ if (err) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: cannot accept %d\n", err);
+ return;
+ }
+
+ sock->sk->sk_data_ready = p9srv_socksrv_dr_save;
+ sock->sk->sk_user_data = NULL;
+ sock->sk->sk_allocation = GFP_NOIO;
+
+ fd = sock_map_fd(sock);
+ if (fd < 0) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: cannot map fd %d\n", fd);
+ return;
+ }
+
+ snprintf(buf, sizeof(buf), "rfdno=%d,wfdno=%d", fd, fd);
+ trans = (*tmod->create)(NULL, buf);
+ if (IS_ERR(trans)) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: cannot create trans %ld\n",
+ PTR_ERR(trans));
+ return;
+ }
+
+ conn = p9srv_conn_create(srv, trans);
+ if (IS_ERR(conn)) {
+ P9_EPRINTK(KERN_ERR,
+ "p9srv_socksrv_accept: cannot create conn %ld\n",
+ PTR_ERR(conn));
+ return;
+ }
+}
--
1.5.2.4
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