befs_fs_types.h

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/*
 * fs/befs/befs_fs_types.h
 *
 * Copyright (C) 2001 Will Dyson ([email protected])
 *
 *
 *
 * from linux/include/linux/befs_fs.h
 *
 * Copyright (C) 1999 Makoto Kato ([email protected])
 *
 */

#ifndef _LINUX_BEFS_FS_TYPES
#define _LINUX_BEFS_FS_TYPES

#ifdef __KERNEL__
#include <linux/types.h>
#endif /*__KERNEL__*/

#define PACKED __attribute__ ((__packed__))

/*
 * Max name lengths of BFS
 */

#define BEFS_NAME_LEN 255

#define BEFS_SYMLINK_LEN 144
#define BEFS_NUM_DIRECT_BLOCKS 12
#define B_OS_NAME_LENGTH 32

/* The datastream blocks mapped by the double-indirect
 * block are always 4 fs blocks long.
 * This eliminates the need for linear searches among
 * the potentially huge number of indirect blocks
 *
 * Err. Should that be 4 fs blocks or 4k???
 * It matters on large blocksize volumes
 */
#define BEFS_DBLINDIR_BRUN_LEN 4

/*
 * Flags of superblock
 */

enum super_flags {
    BEFS_BYTESEX_BE,
    BEFS_BYTESEX_LE,
    BEFS_CLEAN = 0x434c454e,
    BEFS_DIRTY = 0x44495254,
    BEFS_SUPER_MAGIC1 = 0x42465331, /* BFS1 */
    BEFS_SUPER_MAGIC2 = 0xdd121031,
    BEFS_SUPER_MAGIC3 = 0x15b6830e,
};

#define BEFS_BYTEORDER_NATIVE 0x42494745
#define BEFS_BYTEORDER_NATIVE_LE (__force fs32)cpu_to_le32(BEFS_BYTEORDER_NATIVE)
#define BEFS_BYTEORDER_NATIVE_BE (__force fs32)cpu_to_be32(BEFS_BYTEORDER_NATIVE)

#define BEFS_SUPER_MAGIC BEFS_SUPER_MAGIC1
#define BEFS_SUPER_MAGIC1_LE (__force fs32)cpu_to_le32(BEFS_SUPER_MAGIC1)
#define BEFS_SUPER_MAGIC1_BE (__force fs32)cpu_to_be32(BEFS_SUPER_MAGIC1)

/*
 * Flags of inode
 */

#define BEFS_INODE_MAGIC1 0x3bbe0ad9

enum inode_flags {
    BEFS_INODE_IN_USE = 0x00000001,
    BEFS_ATTR_INODE = 0x00000004,
    BEFS_INODE_LOGGED = 0x00000008,
    BEFS_INODE_DELETED = 0x00000010,
    BEFS_LONG_SYMLINK = 0x00000040,
    BEFS_PERMANENT_FLAG = 0x0000ffff,
    BEFS_INODE_NO_CREATE = 0x00010000,
    BEFS_INODE_WAS_WRITTEN = 0x00020000,
    BEFS_NO_TRANSACTION = 0x00040000,
};
/* 
 * On-Disk datastructures of BeFS
 */

typedef u64 __bitwise fs64;
typedef u32 __bitwise fs32;
typedef u16 __bitwise fs16;

typedef u64 befs_off_t;
typedef fs64 befs_time_t;

/* Block runs */
typedef struct {
    fs32 allocation_group;
    fs16 start;
    fs16 len;
} PACKED befs_disk_block_run;

typedef struct {
    u32 allocation_group;
    u16 start;
    u16 len;
} PACKED befs_block_run;

typedef befs_disk_block_run befs_disk_inode_addr;
typedef befs_block_run befs_inode_addr;

/*
 * The Superblock Structure
 */
typedef struct {
    char name[B_OS_NAME_LENGTH];
    fs32 magic1;
    fs32 fs_byte_order;

    fs32 block_size;
    fs32 block_shift;

    fs64 num_blocks;
    fs64 used_blocks;

    fs32 inode_size;

    fs32 magic2;
    fs32 blocks_per_ag;
    fs32 ag_shift;
    fs32 num_ags;

    fs32 flags;

    befs_disk_block_run log_blocks;
    fs64 log_start;
    fs64 log_end;

    fs32 magic3;
    befs_disk_inode_addr root_dir;
    befs_disk_inode_addr indices;

} PACKED befs_super_block;

/* 
 * Note: the indirect and dbl_indir block_runs may
 * be longer than one block!
 */
typedef struct {
    befs_disk_block_run direct[BEFS_NUM_DIRECT_BLOCKS];
    fs64 max_direct_range;
    befs_disk_block_run indirect;
    fs64 max_indirect_range;
    befs_disk_block_run double_indirect;
    fs64 max_double_indirect_range;
    fs64 size;
} PACKED befs_disk_data_stream;

typedef struct {
    befs_block_run direct[BEFS_NUM_DIRECT_BLOCKS];
    befs_off_t max_direct_range;
    befs_block_run indirect;
    befs_off_t max_indirect_range;
    befs_block_run double_indirect;
    befs_off_t max_double_indirect_range;
    befs_off_t size;
} PACKED befs_data_stream;

/* Attribute */
typedef struct {
    fs32 type;
    fs16 name_size;
    fs16 data_size;
    char name[1];
} PACKED befs_small_data;

/* Inode structure */
typedef struct {
    fs32 magic1;
    befs_disk_inode_addr inode_num;
    fs32 uid;
    fs32 gid;
    fs32 mode;
    fs32 flags;
    befs_time_t create_time;
    befs_time_t last_modified_time;
    befs_disk_inode_addr parent;
    befs_disk_inode_addr attributes;
    fs32 type;

    fs32 inode_size;
    fs32 etc;       /* not use */

    union {
        befs_disk_data_stream datastream;
        char symlink[BEFS_SYMLINK_LEN];
    } data;

    fs32 pad[4];        /* not use */
    befs_small_data small_data[1];
} PACKED befs_inode;

/*
 * B+tree superblock
 */

#define BEFS_BTREE_MAGIC 0x69f6c2e8

enum btree_types {
    BTREE_STRING_TYPE = 0,
    BTREE_INT32_TYPE = 1,
    BTREE_UINT32_TYPE = 2,
    BTREE_INT64_TYPE = 3,
    BTREE_UINT64_TYPE = 4,
    BTREE_FLOAT_TYPE = 5,
    BTREE_DOUBLE_TYPE = 6
};

typedef struct {
    fs32 magic;
    fs32 node_size;
    fs32 max_depth;
    fs32 data_type;
    fs64 root_node_ptr;
    fs64 free_node_ptr;
    fs64 max_size;
} PACKED befs_disk_btree_super;

typedef struct {
    u32 magic;
    u32 node_size;
    u32 max_depth;
    u32 data_type;
    befs_off_t root_node_ptr;
    befs_off_t free_node_ptr;
    befs_off_t max_size;
} PACKED befs_btree_super;

/*
 * Header structure of each btree node
 */
typedef struct {
    fs64 left;
    fs64 right;
    fs64 overflow;
    fs16 all_key_count;
    fs16 all_key_length;
} PACKED befs_btree_nodehead;

typedef struct {
    befs_off_t left;
    befs_off_t right;
    befs_off_t overflow;
    u16 all_key_count;
    u16 all_key_length;
} PACKED befs_host_btree_nodehead;

#endif              /* _LINUX_BEFS_FS_TYPES */