/*
 * ar3c-kernel - lsbd.h 
 * Copyright (C) 2010  Krzysztof Mazur <krzysiek@podlesie.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Fundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __LINUX_LSBD_H
#define __LINUX_LSBD_H

#include <linux/ioctl.h>
// #include <linux/types.h>

#include <inttypes.h>

typedef uint8_t __u8;
typedef uint32_t __u32;
typedef uint64_t __u64;
typedef uint8_t u8;
typedef uint32_t u32;
typedef uint64_t u64;

#define LSBD_SET_DEV		_IO('l', 0x0)
#define LSBD_PART		_IO('l', 0x1)

#define LSBD_PART_MIRRORED	1
struct lsbd_part_info {
	__u32 num;
	__u32 start;
	__u32 size;
	__u32 flags;
} __attribute__((packed));

#if __KERNEL__ || __LSBD_FORMAT__
#define LSBD_PART_MASK		0xffffff00
#define LSBD_PART_FLAGS_MASK	0xff
#define LSBD_PART_MIRRORED	1
struct lsbd_part {
	u32 start_flags;
	u32 size_res;
} __attribute__((packed));

#define LSBD_BLOCK_MAGIC	0x4c534244AA1122FFULL
struct lsbd_block {
	u64 magic;		/* 0x00	block magic */
	u32 version;		/* 0x08	block version */
	u32 revision;		/* 0x0c	block revision */
	u64 ctime;		/* 0x10	lsbd device creation time */
	u64 mtime;		/* 0x18	last modify time */
	u64 epoch;		/* 0x20	unique block sequence number */
	u64 age;		/* 0x28	number of writes of this block */
	
	u32 sector_size;	/* 0x30	sector size in bytes */
	u32 sectors_per_block;	/* 0x34	in sectors */
	u32 blocks;		/* 0x38	number of blocks */
	u32 lsectors;		/* 0x3c	number of logical sectors */

	/*
	 * lcache access needs to read previously written logical blocks,
	 * not physical. This is for fast access of those blocks.
	 * The i-th pointer specifies (1 << i) previous block.
	 */
	u32 prev_block[16];	/* 0x40	previous block table */

	u32 ptab_offset;	/* 0x80 */
	u32 flags;		/* 0x84 LSBD_* flags */
	u32 pad1;		/* 0x88 0 */
	u32 ptab_checksum;	/* 0x8c */

	/* lcache - logical -> physical mapping cache */
	u32 lcache_offset;	/* 0x90	lcache location in block */
	u32 lcache_base;	/* 0x94	first logical sector in this cache */
	u32 lcache_chunk;	/* 0x98	number of entries per lcache */
	u32 lcache_checksum;	/* 0x9c	lcache content checksum */
	
	u32 pad2[(0x100 - 0xa0) / 4];	/* 0xc0 - reserved */

	struct lsbd_part part[16];	/* 0x100-0x17f partition table */

	u32 pad3[256 - 0x180/4 - 1];	/* 0xc0 */

	u32 checksum;
} __attribute__((packed));

/* LSBD flags */
#define LSBD_MIRRORED	1	/* block device uses mirroring */

struct lsbd_sect {
	u64 epoch;		/* version of this sector */
	u64 mtime;		/* last modify time */
	u32 id;			/* sector id */
	u32 age;		/* weighted update frequency */
	u32 flags;
	u32 data_checksum;	/* data checksum */
} __attribute__((packed));

#define LSBD_SECT_INVALID	0xffffffffUL
#define LSBD_SECT_ZERO		0xfffffffeUL
/*
 * lcache is a table of physical mappings of logical sectors [lcache_base;
 * lcache_base + lcache_chunk) to physical sectors.
 */
typedef u32 lsbd_lcache_t;
#endif



#endif