ext2.h

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#ifndef __EXT_2_H__
#define __EXT_2_H__
 
#include <stdint.h>
#include <Fs/vdisk.h>
 
#define EXT2_SUPER_BLOCK_MAGIC 0xEF53
#define EXT2_DIRECT_BLOCKS 12
 
#pragma pack(push,1)
typedef struct _ext2_sb_ {
    uint32_t inodes_count;
    uint32_t blocks_count;
    uint32_t r_blocks_count;
    uint32_t free_blocks_count;
    uint32_t free_inodes_count;
    uint32_t free_data_block;
    uint32_t log_block_size;
    uint32_t log_frag_size;
    uint32_t blocks_per_group;
    uint32_t frags_per_group;
    uint32_t inodes_per_group;
    uint32_t mtime;
    uint32_t wtime;
 
    uint16_t mnt_count;
    uint16_t max_mnt_count;
    uint16_t magic;
    uint16_t state;
    uint16_t errors;
    uint16_t minor_rev_level;
 
    uint32_t lastcheck;
    uint32_t checkinterval;
    uint32_t creator_os;
    uint32_t rev_level;
 
    uint16_t def_resuid;
    uint16_t def_resgid;
 
    uint32_t first_ino;
    uint16_t inode_size;
    uint16_t block_group_nr;
    uint32_t feature_compat;
    uint32_t feature_incompat;
    uint32_t feature_ro_compat;
 
    uint8_t uuid[16];
    uint8_t volume_name[16];
 
    uint8_t last_mounted;
    uint32_t algo_bitmap;
 
    uint8_t prealloc_blocks;
    uint8_t prealloc_dir_blocks;
    uint16_t padding;
 
    uint8_t journal_uuid[16];
    uint32_t journal_inum;
    uint32_t journal_dev;
    uint32_t last_orphan;
 
    uint32_t hash_seed[4];
    uint8_t def_hash_version;
    uint16_t padding_a;
    uint8_t padding_b;
 
    uint32_t default_mount_options;
    uint32_t first_meta_bg;
    uint8_t unused[760];
}Ext2Superblock;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _ext2bgdesc_ {
    uint32_t block_bitmap;
    uint32_t inode_bitmap;
    uint32_t inode_table;
    uint16_t free_blocks_count;
    uint16_t free_inodes_count;
    uint16_t used_dirs_count;
    uint16_t pad;
    uint8_t reserved[12];
}Ext2BlockDescriptor;
#pragma pack(pop)
 
/* File Types */
#define EXT2_S_IFSOCK  0xC000
#define EXT2_S_IFLNK   0xA000
#define EXT2_S_IFREG   0x8000
#define EXT2_S_IFBLK   0x6000
#define EXT2_S_IFDIR   0x4000
#define EXT2_S_IFCHR   0x2000
#define EXT2_S_IFIFO   0x1000
 
/* setuid */
#define EXT2_S_ISUID   0x0800
#define EXT2_S_ISGID   0x0400
#define EXT2_S_ISVTX   0x0200
 
/* rights */
#define EXT2_S_IRUSR   0x0100
#define EXT2_S_IWUSR   0x0080
#define EXT2_S_IXUSR   0x0040
#define EXT2_S_IRGRP   0x0020
#define EXT2_S_IWGRP   0x0010
#define EXT2_S_IXGRP   0x0008
#define EXT2_S_IROTH   0x0004
#define EXT2_S_IWOTH   0x0002
#define EXT2_S_IXOTH   0x0001
 
 
#pragma pack(push,1)
typedef struct _ext2_inode_ {
    uint16_t mode;
    uint16_t uid;
    uint32_t size;
    uint32_t atime;
    uint32_t ctime;
    uint32_t mtime;
    uint32_t dtime;
    uint16_t gid;
    uint16_t links_count;
    uint32_t blocks;
    uint32_t flags;
    uint32_t osd1;
    uint32_t block[15];
    uint32_t generation;
    uint32_t file_acl;
    uint32_t dir_acl;
    uint32_t faddr;
    uint8_t osd2[12];
}Ext2Inode;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _ext2_dir_ {
    uint32_t inode;
    uint16_t rec_len;
    uint8_t name_len;
    uint8_t file_type;
    char name[]; //255 bytes
}Ext2Dir;
#pragma pack(pop)
 
#define EXT2_BGD_BLOCK 2
 
#define E_SUCCESS 0
#define E_BADBLOCK 1
#define E_NOSPACE 2
#define E_BADPARENT 3
 
#define EXT2_FLAG_READWRITE  0x00002
#define EXT2_FLAG_LOUD  0x0004
 
 
/*
 * Ext2Initialise -- mount the file system
 */
extern void Ext2Initialise(AuVDisk* vdisk, char* mountname);
 
#endif