/*
* 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"
#include "serialize.h"
#define NUMBER_CONNECTIONS 2 // power of 2
#define DEBUG
extern struct workqueue_struct *dnbd3_wq;
/**
* struct dnbd3_server - defining a server for dnbd3
* @host: host of this server
* @rtts: last four round trip time measurements in microseconds
* @protocol_version: dnbd3 protocol version of this server
* @failures: how many times the server was unreachable
*/
struct dnbd3_server {
dnbd3_host_t host;
uint64_t rtts[4];
uint16_t protocol_version;
uint8_t failures;
};
/**
* struct dnbd3_sock - defining a socket for dnbd3
* @sock_nr: nr of this socket
* @device: the dnbd3_device this socket belongs to
* @server: the server this socket is connected to, 'NULL' if not connected
*
*/
struct dnbd3_sock {
uint8_t sock_nr;
struct dnbd3_device *device;
struct dnbd3_server *server;
struct mutex tx_lock;
struct socket *sock;
bool panic;//, discover, panic_count;
uint32_t cookie;
struct work_struct keepalive_worker;
struct work_struct receive_worker;
struct request *pending;
uint16_t receive_command;
};
struct dnbd3_device {
int minor;
struct blk_mq_tag_set tag_set;
struct list_head list;
// block
struct gendisk *disk;
// sysfs
struct kobject kobj;
struct mutex device_lock;
// network
struct dnbd3_sock socks[NUMBER_CONNECTIONS];
char *imgname;
struct dnbd3_server initial_server;
struct dnbd3_server 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
bool update_available;
bool use_server_provided_alts;
uint16_t rid;
uint64_t reported_size;
struct work_struct panic_worker;
struct work_struct discovery_worker;
uint8_t discovery_count;
struct timer_list timer;
uint8_t timer_count;
};
struct dnbd3_cmd {
struct dnbd3_device *dnbd3;
struct mutex lock;
uint32_t cookie;
blk_status_t status;
bool requed;
};
#define _print_sock(level, sock, fmt, ...) \
do { \
if ((sock)->server->host.type == HOST_IP4) { \
printk(level "dnbd%d/%d %pI4:%d: " fmt "\n", (sock)->device->minor, (sock)->sock_nr, (sock)->server->host.addr, (sock)->server->host.port, ## __VA_ARGS__); \
} else { \
printk(level "dnbd%d/%d %pI6:%d: " fmt "\n", (sock)->device->minor, (sock)->sock_nr, (sock)->server->host.addr, (sock)->server->host.port, ## __VA_ARGS__); \
} \
} while (0)
#define _print_server(level, dev, server, fmt, ...) \
do { \
if ((server)->host.type == HOST_IP4) { \
printk(level "dnbd%d: " fmt " %pI4:%d\n", (dev)->minor, ## __VA_ARGS__, (server)->host.addr, (server)->host.port); \
} else { \
printk(level "dnbd%d: " fmt " %pI6:%d\n", (dev)->minor, ## __VA_ARGS__, (server)->host.addr, (server)->host.port); \
} \
} while (0)
#ifdef DEBUG
#define debug(fmt, ...) \
printk(KERN_DEBUG "dnbd: " fmt "\n", ## __VA_ARGS__)
#define debug_dev(dev, fmt, ...) \
printk(KERN_DEBUG "dnbd%d: " fmt "\n", (dev)->minor, ## __VA_ARGS__)
#define debug_sock(sock, fmt, ...) \
_print_sock(KERN_DEBUG, sock, fmt, ## __VA_ARGS__)
#define debug_server(dev, server, fmt, ...) \
_print_server(KERN_DEBUG, dev, server, fmt, ## __VA_ARGS__)
#else
#define debug(fmt, ...)
#define debug_dev(dev, fmt, ...)
#define debug_sock(sock, fmt, ...)
#define debug_server(dev, server, fmt, ...)
#endif
#define info(fmt, ...) \
printk(KERN_INFO "dnbd: " fmt "\n", ## __VA_ARGS__)
#define info_dev(dev, fmt, ...) \
printk(KERN_INFO "dnbd%d: " fmt "\n", (dev)->minor, ## __VA_ARGS__)
#define info_sock(sock, fmt, ...) \
_print_sock(KERN_INFO, sock, fmt, ## __VA_ARGS__)
#define info_server(dev, server, fmt, ...) \
_print_server(KERN_INFO, dev, server, fmt, ## __VA_ARGS__)
#define warn(fmt, ...) \
printk(KERN_WARNING "dnbd: " fmt "\n", ## __VA_ARGS__)
#define warn_dev(dev, fmt, ...) \
printk(KERN_WARNING "dnbd%d: " fmt "\n", (dev)->minor, ## __VA_ARGS__)
#define warn_sock(sock, fmt, ...) \
_print_sock(KERN_WARNING, sock, fmt, ## __VA_ARGS__)
#define warn_server(dev, server, fmt, ...) \
_print_server(KERN_WARNING, dev, server, fmt, ## __VA_ARGS__)
#define error(fmt, ...) \
printk(KERN_ERR "dnbd: " fmt "\n", ## __VA_ARGS__)
#define error_dev(dev, fmt, ...) \
printk(KERN_ERR "dnbd%d: " fmt "\n", (dev)->minor, ## __VA_ARGS__)
#define error_sock(sock, fmt, ...) \
_print_sock(KERN_ERR, sock, fmt, ## __VA_ARGS__)
#define error_server(dev, server, fmt, ...) \
_print_server(KERN_ERR, dev, server, fmt, ## __VA_ARGS__)
#endif /* DNBD_H_ */
