diff options
Diffstat (limited to 'src/kernel/dnbd3_main.c')
-rw-r--r-- | src/kernel/dnbd3_main.c | 93 |
1 files changed, 93 insertions, 0 deletions
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)"); |