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/*
* 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);
}
int is_same_server(const dnbd3_server_t * const a, const dnbd3_server_t * const b)
{
return (a->host.type == b->host.type) && (a->host.port == b->host.port)
&& (0 == memcmp(a->host.addr, b->host.addr, (a->host.type == HOST_IP4 ? 4 : 16)));
}
dnbd3_server_t *get_existing_server(const dnbd3_server_entry_t * const newserver, dnbd3_device_t * const dev)
{
int i;
for (i = 0; i < NUMBER_SERVERS; ++i)
{
if ((newserver->host.type == dev->alt_servers[i].host.type)
&& (newserver->host.port == dev->alt_servers[i].host.port)
&& (0
== memcmp(newserver->host.addr, dev->alt_servers[i].host.addr, (newserver->host.type == HOST_IP4 ? 4 : 16))))
{
return &dev->alt_servers[i];
break;
}
}
return NULL ;
}
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 %s\n", DNBD3_ENDIAN_MODE);
// 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;
pr_debug("exiting kernel module...\n");
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 done\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)");
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