// ext2.h
// Author: Josh Holtrop
// Date: 08/22/04
// Modified: 08/22/04

#ifndef __HOS_EXT2_H__
#define __HOS_EXT2_H__ __HOS_EXT2_H__

#include "hos_defines.h"
#include "fs/devices.h"

typedef struct {
  u32_t   s_inodes_count;         /* Inodes count */
  u32_t   s_blocks_count;         /* Blocks count */
  u32_t   s_r_blocks_count;       /* Reserved blocks count */
  u32_t   s_free_blocks_count;    /* Free blocks count */
  u32_t   s_free_inodes_count;    /* Free inodes count */
  u32_t   s_first_data_block;     /* First Data Block */
  u32_t   s_log_block_size;       /* Block size */
  int     s_log_frag_size;        /* Fragment size */
  u32_t   s_blocks_per_group;     /* # Blocks per group */
  u32_t   s_frags_per_group;      /* # Fragments per group */
  u32_t   s_inodes_per_group;     /* # Inodes per group */
  u32_t   s_mtime;                /* Mount time */
  u32_t   s_wtime;                /* Write time */
  u16_t   s_mnt_count;            /* Mount count */
  short   s_max_mnt_count;        /* Maximal mount count */
  u16_t   s_magic;                /* Magic signature */
  u16_t   s_state;                /* File system state */
  u16_t   s_errors;               /* Behaviour when detecting errors */
  u16_t   s_minor_rev_level;      /* minor revision level */
  u32_t   s_lastcheck;            /* time of last check */
  u32_t   s_checkinterval;        /* max. time between checks */
  u32_t   s_creator_os;           /* OS */
  u32_t   s_rev_level;            /* Revision level */
  u16_t   s_def_resuid;           /* Default uid for reserved blocks */
  u16_t   s_def_resgid;           /* Default gid for reserved blocks */

  /*
   * EXT2_DYNAMIC_REV fields...
   */
  u32_t   s_first_ino;            /* First non-reserved inode */
  u16_t   s_inode_size;           /* size of inode structure */
  u16_t   s_block_group_nr;       /* block group # of this superblock */
  u32_t   s_feature_compat;       /* compatible feature set */
  u32_t   s_feature_incompat;     /* incompatible feature set */
  u32_t   s_feature_ro_compat;    /* readonly-compatible feature set */
  u8_t    s_uuid[16];             /* 128-bit uuid for volume */
  char    s_volume_name[16];      /* volume name */
  char    s_last_mounted[64];     /* directory where last mounted */
  u32_t   s_algorithm_usage_bitmap; /* For compression */

  /*
   * Performance hints...
   */
  u8_t    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
  u8_t    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
  u16_t   s_padding1;

  /*
   * Journaling information...
   */
  u8_t    s_journal_uuid[16];     /* uuid of journal superblock */
  u32_t   s_journal_inum;         /* inode number of journal file */
  u32_t   s_journal_dev;          /* device number of journal file */
  u32_t   s_last_orphan;          /* start of list of inodes to delete */
  u32_t   s_hash_seed[4];         /* HTREE hash seed */
  u8_t    s_def_hash_version;     /* Default hash version to use */
  u8_t    s_reserved_char_pad;
  u16_t   s_reserved_word_pad;
  u32_t   s_default_mount_opts;
  u32_t   s_first_meta_bg;        /* First metablock block group */
  u32_t   s_reserved[190];        /* Padding to the end of the block */

} ext2_super_block_t;


void ext2_read_super(major_t major, minor_t minor);


#endif