linux-kernel - [RFC 25/31] mars: add new module light

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Message-Id: <b2deb5d38918a9b4acc869639b24428d8ecb0132.1451558672.git.tst@schoebel-theuer.de>
Date:	Thu, 31 Dec 2015 12:36:20 +0100
From:	Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To:	linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 25/31] mars: add new module light_net

Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
 drivers/staging/mars/mars_light/light_net.c | 109 ++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 drivers/staging/mars/mars_light/light_net.c

diff --git a/drivers/staging/mars/mars_light/light_net.c b/drivers/staging/mars/mars_light/light_net.c
new file mode 100644
index 0000000..9890edd
--- /dev/null
+++ b/drivers/staging/mars/mars_light/light_net.c
@@ -0,0 +1,109 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <linux/mars_light/light_strategy.h>
+#include <linux/xio/xio_net.h>
+
+static
+char *_xio_translate_hostname(const char *name)
+{
+	char *res = brick_strdup(name);
+	char *test;
+	char *tmp;
+
+	for (tmp = res; *tmp; tmp++) {
+		if (*tmp == ':') {
+			*tmp = '\0';
+			break;
+		}
+	}
+
+	tmp = path_make("/mars/ips/ip-%s", res);
+	if (unlikely(!tmp))
+		goto done;
+
+	test = mars_readlink(tmp);
+	if (test && test[0]) {
+		XIO_DBG("'%s' => '%s'\n", tmp, test);
+		brick_string_free(res);
+		res = test;
+	} else {
+		brick_string_free(test);
+		XIO_WRN("no hostname translation for '%s'\n", tmp);
+	}
+	brick_string_free(tmp);
+
+done:
+	return res;
+}
+
+int xio_send_dent_list(struct xio_socket *sock, struct list_head *anchor)
+{
+	struct list_head *tmp;
+	struct mars_dent *dent;
+	int status = 0;
+
+	for (tmp = anchor->next; tmp != anchor; tmp = tmp->next) {
+		dent = container_of(tmp, struct mars_dent, dent_link);
+		status = xio_send_struct(sock, dent, mars_dent_meta);
+		if (status < 0)
+			break;
+	}
+	if (status >= 0) { /*  send EOR */
+		status = xio_send_struct(sock, NULL, mars_dent_meta);
+	}
+	return status;
+}
+
+int xio_recv_dent_list(struct xio_socket *sock, struct list_head *anchor)
+{
+	int status;
+
+	for (;;) {
+		struct mars_dent *dent = brick_zmem_alloc(sizeof(struct mars_dent));
+
+		INIT_LIST_HEAD(&dent->dent_link);
+		INIT_LIST_HEAD(&dent->brick_list);
+
+		status = xio_recv_struct(sock, dent, mars_dent_meta);
+		if (status <= 0) {
+			xio_free_dent(dent);
+			goto done;
+		}
+		list_add_tail(&dent->dent_link, anchor);
+	}
+done:
+	return status;
+}
+
+/***************** module init stuff ************************/
+
+int __init init_sy_net(void)
+{
+	XIO_INF("init_sy_net()\n");
+	xio_translate_hostname = _xio_translate_hostname;
+	return 0;
+}
+
+void exit_sy_net(void)
+{
+	XIO_INF("exit_sy_net()\n");
+}
-- 
2.6.4

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