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Ayaan Tunio
2025-02-12 09:54:05 -05:00
commit 7118adc514
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139
kernel/include/fs/ext2/ext2.h Normal file
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#ifndef _KERNEL_FS_EXT2_EXT2_H
#define _KERNEL_FS_EXT2_EXT2_H
#include <libkern/c_attrs.h>
#include <libkern/types.h>
#define SUPERBLOCK_START 1024
#define SUPERBLOCK_LEN (sizeof(superblock_t))
struct PACKED superblock {
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 first_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[64];
uint32_t algo_bitmap;
uint8_t prealloc_blocks;
uint8_t prealloc_dir_blocks;
// current jurnalling is unsupported
uint8_t unused[1024 - 206];
};
typedef struct superblock superblock_t;
#define GROUP_LEN (sizeof(group_desc_t))
struct PACKED group_desc {
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];
};
typedef struct group_desc group_desc_t;
struct ext2_groups_info {
uint32_t count;
group_desc_t* table;
};
typedef struct ext2_groups_info ext2_groups_info_t;
struct ext2_fsdata {
superblock_t* sb;
ext2_groups_info_t* gt;
size_t blksize;
};
typedef struct ext2_fsdata ext2_fsdata_t;
#define S_IFSOCK 0xC000
#define S_IFLNK 0xA000
#define S_IFREG 0x8000
#define S_IFBLK 0x6000
#define S_IFDIR 0x4000
#define S_IFCHR 0x2000
#define S_IFIFO 0x1000
#define S_ISUID 0x0800
#define S_ISGID 0x0400
#define S_ISVTX 0x0200
#define S_IRUSR 0x0100
#define S_IWUSR 0x0080
#define S_IXUSR 0x0040
#define S_IRGRP 0x0020
#define S_IWGRP 0x0010
#define S_IXGRP 0x0008
#define S_IROTH 0x0004
#define S_IWOTH 0x0002
#define S_IXOTH 0x0001
#define INODE_LEN (sizeof(inode_t))
#define INODES_RESERVED 11
struct PACKED inode {
mode_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;
uint32_t osd2[3];
};
typedef struct inode inode_t;
#define DIR_ENTRY_LEN (sizeof(dir_entry_t))
struct PACKED dir_entry {
uint32_t inode;
uint16_t rec_len;
uint8_t name_len;
uint8_t file_type;
char* name;
};
typedef struct dir_entry dir_entry_t;
void ext2_install();
#endif // _KERNEL_FS_EXT2_EXT2_H