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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.
*
*/
#include <linux/kobject.h>
#include "sysfs.h"
#include "utils.h"
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
ssize_t show_cur_server_addr(char *buf, dnbd3_device_t *dev)
{
if (dev->cur_server.host.type == HOST_IP4)
return MIN(snprintf(buf, PAGE_SIZE, "%pI4,%d\n", dev->cur_server.host.addr, (int)ntohs(dev->cur_server.host.port)), PAGE_SIZE);
else if (dev->cur_server.host.type == HOST_IP6)
return MIN(snprintf(buf, PAGE_SIZE, "%pI6,%d\n", dev->cur_server.host.addr, (int)ntohs(dev->cur_server.host.port)), PAGE_SIZE);
*buf = '\0';
return 0;
}
ssize_t show_cur_server_rtt(char *buf, dnbd3_device_t *dev)
{
return MIN(snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)dev->cur_rtt), PAGE_SIZE);
}
ssize_t show_alt_server_num(char *buf, dnbd3_device_t *dev)
{
int i, num = 0;
for (i = 0; i < NUMBER_SERVERS; ++i)
{
if (dev->alt_servers[i].host.type) ++num;
}
return MIN(snprintf(buf, PAGE_SIZE, "%d\n", num), PAGE_SIZE);
}
ssize_t show_alt_servers(char *buf, dnbd3_device_t *dev)
{
int i, size = PAGE_SIZE, ret;
for (i = 0; i < NUMBER_SERVERS; ++i)
{
if (dev->alt_servers[i].host.type == HOST_IP4)
ret = MIN(snprintf(buf, size, "%pI4,%d,%llu,%d\n",
dev->alt_servers[i].host.addr,
(int)ntohs(dev->alt_servers[i].host.port),
(unsigned long long)((dev->alt_servers[i].rtts[0] + dev->alt_servers[i].rtts[1] + dev->alt_servers[i].rtts[2] + dev->alt_servers[i].rtts[3]) / 4),
(int)dev->alt_servers[i].failures)
, size);
else if (dev->alt_servers[i].host.type == HOST_IP6)
ret = MIN(snprintf(buf, size, "%pI6,%d,%llu,%d\n",
dev->alt_servers[i].host.addr,
(int)ntohs(dev->alt_servers[i].host.port),
(unsigned long long)((dev->alt_servers[i].rtts[0] + dev->alt_servers[i].rtts[1] + dev->alt_servers[i].rtts[2] + dev->alt_servers[i].rtts[3]) / 4),
(int)dev->alt_servers[i].failures)
, size);
else
continue;
size -= ret;
buf += ret;
if (size <= 0)
{
size = 0;
break;
}
}
return PAGE_SIZE - size;
}
ssize_t show_image_name(char *buf, dnbd3_device_t *dev)
{
if (dev->imgname == NULL) return sprintf(buf, "(null)");
return MIN(snprintf(buf, PAGE_SIZE, "%s\n", dev->imgname), PAGE_SIZE);
}
ssize_t show_rid(char *buf, dnbd3_device_t *dev)
{
return MIN(snprintf(buf, PAGE_SIZE, "%d\n", dev->rid), PAGE_SIZE);
}
ssize_t show_update_available(char *buf, dnbd3_device_t *dev)
{
return MIN(snprintf(buf, PAGE_SIZE, "%d\n", dev->update_available), PAGE_SIZE);
}
device_attr_t cur_server_addr =
{
.attr = {.name = "cur_server_addr", .mode = 0444 },
.show = show_cur_server_addr,
.store = NULL,
};
device_attr_t cur_server_rtt =
{
.attr = {.name = "cur_server_rtt", .mode = 0444 },
.show = show_cur_server_rtt,
.store = NULL,
};
device_attr_t alt_server_num =
{
.attr = {.name = "alt_server_num", .mode = 0444 },
.show = show_alt_server_num,
.store = NULL,
};
device_attr_t alt_servers =
{
.attr = {.name = "alt_servers", .mode = 0444 },
.show = show_alt_servers,
.store = NULL,
};
device_attr_t image_name =
{
.attr = {.name = "image_name", .mode = 0444 },
.show = show_image_name,
.store = NULL,
};
device_attr_t rid =
{
.attr = {.name = "rid", .mode = 0444 },
.show = show_rid,
.store = NULL,
};
device_attr_t update_available =
{
.attr = {.name = "update_available", .mode = 0444 },
.show = show_update_available,
.store = NULL,
};
ssize_t device_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
device_attr_t *device_attr = container_of(attr, device_attr_t, attr);
dnbd3_device_t *dev = container_of(kobj, dnbd3_device_t, kobj);
return device_attr->show(buf, dev);
}
struct attribute *device_attrs[] =
{
&cur_server_addr.attr,
&cur_server_rtt.attr,
&alt_server_num.attr,
&alt_servers.attr,
&image_name.attr,
&rid.attr,
&update_available.attr,
NULL,
};
struct sysfs_ops device_ops =
{
.show = device_show,
};
void release(struct kobject *kobj)
{
kobj->state_initialized = 0;
}
struct kobj_type device_ktype =
{
.default_attrs = device_attrs,
.sysfs_ops = &device_ops,
.release = release,
};
void dnbd3_sysfs_init(dnbd3_device_t *dev)
{
int error;
struct kobject *kobj = &dev->kobj;
struct kobj_type *ktype = &device_ktype;
struct kobject *parent = &disk_to_dev(dev->disk)->kobj;
error = kobject_init_and_add(kobj, ktype, parent, "%s", "net");
if (error)
printk("Error initializing dnbd3 device!\n");
}
void dnbd3_sysfs_exit(dnbd3_device_t *dev)
{
kobject_put(&dev->kobj);
}
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