Mark
140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
#pragma once
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#include "sys/types.h"
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#define EXT2_FLAG_RO (1 << 0)
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#define EXT2_STATE_CLEAN 1
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#define EXT2_STATE_DIRTY 2
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#define EXT2_ERROR_IGNORE 1
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#define EXT2_ERROR_READONLY 2
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#define EXT2_ERROR_PANIC 3
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#define EXT2_REQ_COMP (1 << 0)
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#define EXT2_REQ_ENT_TYPE (1 << 1)
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#define EXT2_REQ_REPLAY_JOURNAL (1 << 2)
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#define EXT2_REQ_JOURNAL_DEV (1 << 3)
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#define EXT2_RO_SPARSE_SB (1 << 0)
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#define EXT2_RO_64BIT_SIZE (1 << 1)
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#define EXT2_RO_DIR_BTREE (1 << 2)
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#define EXT2_SIGNATURE 0xEF53
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#define EXT2_IFIFO 0x1000
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#define EXT2_IFCHR 0x2000
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#define EXT2_IFDIR 0x4000
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#define EXT2_IFBLK 0x6000
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#define EXT2_IFREG 0x8000
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#define EXT2_IFLNK 0xA000
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#define EXT2_IFSOCK 0xC000
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#define EXT2_DIRECT_BLOCKS 12
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struct slab_cache;
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struct vnode;
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struct ext2_superblock {
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// Base superblock
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uint32_t inode_count;
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uint32_t block_count;
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uint32_t reserved_blocks;
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uint32_t free_blocks;
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uint32_t free_inodes;
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uint32_t superblock_no;
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uint32_t log2_block_size;
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uint32_t log2_frag_size;
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uint32_t block_group_blocks;
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uint32_t block_group_frags;
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uint32_t block_group_inodes;
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uint32_t mount_time;
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uint32_t write_time;
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uint16_t mount_count;
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uint16_t fsck_mount_count;
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uint16_t ext2_signature;
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uint16_t state;
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uint16_t error_behavior;
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uint16_t version_minor;
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uint32_t fsck_time;
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uint32_t fsck_interval;
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uint32_t os_id;
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uint32_t version_major;
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uint16_t reserved_uid;
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uint16_t reserved_gid;
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// Extended superblock
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uint32_t first_inode; // == 11 in < 1.0
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uint16_t inode_size; // == 128 in < 1.0
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uint16_t superblock_block_group; // For backup
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uint32_t optional_features; // Don't matter
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uint32_t required_features; // Cannot read without these
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uint32_t write_required_features; // Can read without these
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char filesystem_id[16];
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char volume_name[16];
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char last_mount_path[64];
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uint32_t compression;
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uint8_t prealloc_file_blocks;
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uint8_t prealloc_dir_blocks;
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uint16_t __res0;
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char journal_id[16];
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uint32_t journal_inode;
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uint32_t journal_device;
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uint32_t orphan_inode_list_head;
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} __attribute__((packed));
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struct ext2_blkgrp_desc {
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uint32_t block_bitmap_no;
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uint32_t inode_bitmap_no;
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uint32_t inode_table_no;
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uint16_t free_blocks;
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uint16_t free_inodes;
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uint16_t directory_count;
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char __pad[14];
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} __attribute__((packed));
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struct ext2_inode {
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uint16_t mode;
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uint16_t uid;
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uint32_t size_lower;
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uint32_t atime;
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uint32_t ctime;
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uint32_t mtime;
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uint32_t dtime;
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uint16_t gid;
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uint16_t hard_links;
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uint32_t sector_count;
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uint32_t flags;
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uint32_t os_val1;
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uint32_t direct_blocks[EXT2_DIRECT_BLOCKS];
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uint32_t indirect_block_l1;
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uint32_t indirect_block_l2;
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uint32_t indirect_block_l3;
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uint32_t generation;
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uint32_t facl;
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union {
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uint32_t size_upper;
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uint32_t dir_acl;
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};
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uint32_t frag_block_no;
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uint32_t os_val2;
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} __attribute__((packed));
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struct ext2_data {
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union {
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struct ext2_superblock sb;
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char __data[1024];
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};
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struct ext2_blkgrp_desc *bgdt;
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struct vnode *root;
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struct ext2_inode *root_inode;
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struct slab_cache *inode_cache;
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uint32_t flags;
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uint32_t block_size;
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uint32_t inode_size;
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uint32_t inodes_per_block;
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uint32_t blkgrp_inode_blocks;
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uint32_t bgdt_entry_count;
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uint32_t bgdt_size_blocks;
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};
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