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// MIT License, Copyright (c) 2021 Marvin Borner
#ifndef FS_EXT2_H
#define FS_EXT2_H
#include <def.h>
#include <dev.h>
#define EXT2_BOOT 0
#define EXT2_SUPER 1
#define EXT2_ROOT 2
#define EXT2_MAGIC 0xef53
#define EXT2_INODE_SIZE (sizeof(struct ext2_inode))
struct ext2_superblock {
u32 total_inodes;
u32 total_blocks;
u32 su_res_blocks; // Superuser reserved
u32 free_blocks;
u32 free_inodes;
u32 superblock_block_num;
u32 log2_block_size;
u32 log2_frag_size;
u32 blocks_per_group;
u32 frags_per_group;
u32 inodes_per_group;
u32 last_mount_time;
u32 last_write_time;
u16 mounts_since_fsck;
u16 max_mounts_since_fsck;
u16 magic;
u16 state; // 1 clean; 2 errors
u16 error_action;
u16 minor_version;
u32 last_fsck_time;
u32 max_time_since_fsck;
u32 creator_os_id;
u32 major_version;
u16 res_block_uid;
u16 res_block_gid;
};
struct ext2_bgd {
u32 block_bitmap;
u32 inode_bitmap;
u32 inode_table;
u16 free_blocks;
u16 free_inodes;
u16 used_dirs;
u16 pad;
u8 bg_reserved[12];
};
struct ext2_inode {
u16 mode;
u16 uid;
u32 size;
u32 last_access_time;
u32 creation_time;
u32 last_modification_time;
u32 deletion_time;
u16 gid;
u16 link_count;
u32 blocks;
u32 flags;
u32 os_specific_val1;
u32 block[15];
u32 generation;
u32 reserved1;
u32 reserved2;
u32 fragment_addr;
u8 os_specific_val2[12];
};
struct ext2_dirent {
u32 inode_num;
u16 total_len;
u8 name_len;
u8 type_indicator;
u8 name[];
};
struct ext2_file {
struct ext2_inode inode;
u32 pos;
u8 block_index;
u8 *buf;
u32 curr_block_pos;
};
u8 ext2_detect(struct dev *dev);
#endif
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