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/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2019 Frederic Robra <frederic@robra.org>
* Parts copyright 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.
*
*/
#ifndef DNBD_H_
#define DNBD_H_
#include <linux/blk-mq.h>
#include <linux/types.h>
#include <linux/refcount.h>
#include <linux/blkdev.h>
#define KERNEL_MODULE
#include "types.h"
typedef struct
{
dnbd3_host_t host;
uint64_t rtts[4]; // Last four round trip time measurements in microsecond
uint16_t protocol_version; // dnbd3 protocol version of this server
uint8_t failures; // How many times the server was unreachable
} dnbd3_server_t;
typedef struct dnbd3_device_t {
int minor;
struct blk_mq_tag_set tag_set;
struct request_queue queue;
struct mutex config_lock;
refcount_t config_refs;
refcount_t refs;
struct list_head list;
// block
struct gendisk *disk;
// sysfs
struct kobject kobj;
// network
char *imgname;
struct socket *sock;
dnbd3_server_t cur_server, initial_server;
unsigned long cur_rtt;
// serialized_buffer_t payload_buffer;
dnbd3_server_t alt_servers[NUMBER_SERVERS]; // array of alt servers
int new_servers_num; // number of new alt servers that are waiting to be copied to above array
dnbd3_server_entry_t new_servers[NUMBER_SERVERS]; // pending new alt servers
uint8_t discover, panic, disconnecting, update_available, panic_count;
uint8_t use_server_provided_alts;
uint16_t rid;
uint32_t heartbeat_count;
uint64_t reported_size;
// server switch
struct socket *better_sock;
} dnbd3_device_t;
typedef struct dnbd3_cmd {
struct dnbd3_device_t *dnbd3;
struct mutex lock;
int index;
int cookie;
blk_status_t status;
unsigned long flags;
u32 cmd_cookie;
} dnbd3_cmd;
#endif /* DNBD_H_ */
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