From 969496f15e1e0359e26c2c6e995ad4ef82720f86 Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Fri, 16 Oct 2020 17:15:49 +0200
Subject: [BUILD] rewrite CMake build system to track changes of source files

This change restructures the source code directories, separates shared
form non-shared application code and adds CMake dependencies. These
dependencies allow the tracking of changes and trigger a rebuild of
those build targets where changed files are involved.

WARNING: Note that the support of the DNBD3_SERVER_AFL build option is
not supported yet. Thus, the option should be never turned on.
---
 src/kernel/dnbd3_main.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/kernel/dnbd3_main.c

(limited to 'src/kernel/dnbd3_main.c')

diff --git a/src/kernel/dnbd3_main.c b/src/kernel/dnbd3_main.c
new file mode 100644
index 0000000..27e8eed
--- /dev/null
+++ b/src/kernel/dnbd3_main.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the Distributed Network Block Device 3
+ *
+ * Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
+ *
+ * This file may be licensed under the terms of of the
+ * GNU General Public License Version 2 (the ``GPL'').
+ *
+ * Software distributed under the License is distributed
+ * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+ * express or implied. See the GPL for the specific language
+ * governing rights and limitations.
+ *
+ * You should have received a copy of the GPL along with this
+ * program. If not, go to http://www.gnu.org/licenses/gpl.html
+ * or write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <dnbd3/config/client.h>
+#include <dnbd3/version.h>
+#include "dnbd3_main.h"
+#include "blk.h"
+
+int major;
+static unsigned int max_devs = NUMBER_DEVICES;
+static dnbd3_device_t *dnbd3_devices;
+
+struct device *dnbd3_device_to_dev(dnbd3_device_t *dev)
+{
+	return disk_to_dev(dev->disk);
+}
+
+static int __init dnbd3_init(void)
+{
+	int i;
+
+	dnbd3_devices = kcalloc(max_devs, sizeof(*dnbd3_devices), GFP_KERNEL);
+	if (!dnbd3_devices)
+		return -ENOMEM;
+
+	// initialize block device
+	if ((major = register_blkdev(0, "dnbd3")) == 0)
+	{
+		pr_err("register_blkdev failed\n");
+		return -EIO;
+	}
+
+	pr_info("kernel module in version %s loaded\n", DNBD3_VERSION);
+	pr_debug("machine type " ENDIAN_MODE "\n");
+
+	// add MAX_NUMBER_DEVICES devices
+	for (i = 0; i < max_devs; i++)
+	{
+		if (dnbd3_blk_add_device(&dnbd3_devices[i], i) != 0)
+		{
+			pr_err("dnbd3_blk_add_device failed\n");
+			return -EIO; // TODO: delete all devices added so far. it could happen that it's not the first one that fails. also call unregister_blkdev and free memory
+		}
+	}
+
+	pr_info("init successful (%i devices)\n", max_devs);
+
+	return 0;
+}
+
+static void __exit dnbd3_exit(void)
+{
+	int i;
+
+	for (i = 0; i < max_devs; i++)
+	{
+		dnbd3_blk_del_device(&dnbd3_devices[i]);
+	}
+
+	unregister_blkdev(major, "dnbd3");
+	kfree(dnbd3_devices);
+
+	pr_info("exit kernel module\n");
+}
+
+module_init(dnbd3_init);
+module_exit(dnbd3_exit);
+
+MODULE_DESCRIPTION("Distributed Network Block Device 3");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DNBD3_VERSION);
+
+module_param(max_devs, int, 0444);
+MODULE_PARM_DESC(max_devs, "number of network block devices to initialize (default: 8)");
-- 
cgit v1.2.3-55-g7522