/*
    filesystem.h -- reiserfs filesystem
    Copyright (C) 2001, 2002 Yury Umanets <torque@ukrpost.net>, see COPYING for 
    licensing and copyright details.
*/

#ifndef FILESYSTEM_H
#define FILESYSTEM_H

#include <sys/stat.h>
#include <dal/dal.h>

#include "path.h"
#include "key.h"

#define FS_FORMAT_3_5				0
#define FS_FORMAT_3_6				2

#define FS_CLEAN				1
#define FS_DIRTY				2

#define FS_CONSISTENT				0
#define FS_CORRUPTED				1

#define DEFAULT_BLOCK_SIZE			4096
#define DEFAULT_SUPER_OFFSET			(64 * 1024)
#define DEFAULT_JOURNAL_SIZE_BS4096		8192
#define DEFAULT_JOURNAL_SIZE_BS1024		8125

typedef struct reiserfs_fs reiserfs_fs_t;

enum reiserfs_hash {
    TEA_HASH = 1,
    YURA_HASH = 2,
    R5_HASH = 3
};

typedef enum reiserfs_hash reiserfs_hash_t;

/* Journal structures */
struct reiserfs_journal_params {
    uint32_t jp_start;
    uint32_t jp_dev;
    uint32_t jp_len;
    uint32_t jp_trans_max;
    uint32_t jp_magic;
    uint32_t jp_max_batch;
    uint32_t jp_max_commit_age;
    uint32_t jp_max_trans_age;
};

typedef struct reiserfs_journal_params reiserfs_journal_params_t;

struct reiserfs_journal_desc {
    uint32_t jd_trans_id;
    uint32_t jd_len;
    uint32_t jd_mount_id;
    uint32_t jd_realblock[1];
};

typedef struct reiserfs_journal_desc reiserfs_journal_desc_t;

struct reiserfs_journal_commit {
    uint32_t jc_trans_id;
    uint32_t jc_len;
    uint32_t jc_realblock[1];
};

typedef struct reiserfs_journal_commit reiserfs_journal_commit_t;

struct reiserfs_journal_trans {
    uint32_t jt_mount_id;
    uint32_t jt_trans_id;
    blk_t jt_desc_blocknr;
    blk_t jt_trans_len;
    blk_t jt_commit_blocknr;
    blk_t jt_next_trans_offset;
};

typedef struct reiserfs_journal_trans reiserfs_journal_trans_t;

struct reiserfs_journal_head {
    uint32_t jh_last_flush_trans_id;
    uint32_t jh_first_unflushed_offset;
    uint32_t jh_mount_id;
	
    reiserfs_journal_params_t jh_params;
};

typedef struct reiserfs_journal_head reiserfs_journal_head_t;

struct reiserfs_journal_cashe {
    uint32_t trans_nr;
    uint32_t *blocks;
};

typedef struct reiserfs_journal_cashe reiserfs_journal_cashe_t;

struct reiserfs_journal {
    dal_t *dal;
    reiserfs_journal_head_t head;
    reiserfs_journal_cashe_t cashe;
};

typedef struct reiserfs_journal reiserfs_journal_t;

/* Superblock structures */
struct reiserfs_super_v1 {
    uint32_t sb_block_count;
    uint32_t sb_free_blocks;
    uint32_t sb_root_block;
    reiserfs_journal_params_t sb_journal;
    uint16_t sb_block_size;
    uint16_t sb_oid_maxsize;
    uint16_t sb_oid_cursize;
    uint16_t sb_umount_state;
    char sb_magic[10];
    uint16_t sb_fs_state;
    uint32_t sb_hash_function_code;
    uint16_t sb_tree_height;
    uint16_t sb_bmap_nr;
    uint16_t sb_format;
    uint16_t sb_reserved_for_journal;
} __attribute__ ((__packed__));

typedef struct reiserfs_super_v1 reiserfs_super_v1_t;

struct reiserfs_super {
    reiserfs_super_v1_t s_v1;
    uint32_t s_inode_generation; 
    uint32_t s_flags;
    char s_uuid[16];
    char s_label[16];
    char s_unused[88];
};

typedef struct reiserfs_super reiserfs_super_t;

/* Filesystem object (directory or file) */
struct reiserfs_object {
    reiserfs_fs_t *fs;
    reiserfs_path_t *path;
    struct stat stat;
    struct key key;
};

typedef struct reiserfs_object reiserfs_object_t;

/* Bitmap */
struct reiserfs_bitmap {
    reiserfs_fs_t *fs;
	
    blk_t start;
    count_t total_blocks;
    count_t used_blocks;
    
    char *map;
    uint32_t size;
};

typedef struct reiserfs_bitmap reiserfs_bitmap_t;

/* Balanced tree */
struct reiserfs_tree {
    long offset;
    reiserfs_fs_t *fs;
};

typedef struct reiserfs_tree reiserfs_tree_t;

/* Filesystem structure */
struct reiserfs_fs {
    dal_t *dal;
	
    reiserfs_tree_t *tree;
    reiserfs_super_t *super;
    reiserfs_bitmap_t *bitmap;
    reiserfs_journal_t *journal;
	
    blk_t super_off;
    uint16_t flags;
    void *data;
};

#endif