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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
------------------------------------------- */
#pragma once
#include <NewKit/Defines.h>
/// @file Ext2.h
/// @brief EXT2 filesystem structures and constants.
#define kExt2FSMagic (0xEF53)
#define kExt2FSMaxFileNameLen (255U)
#define kExt2FSSuperblockOffset (1024)
#define kExt2FSRootInodeNumber (2)
#define kExt2FSInodeSize (128U)
#define kExt2FSBlockSizeBase (1024U)
#define kExt2FSRev0 (0)
#define kExt2FSRev1 (1)
enum
{
kExt2FileTypeUnknown = 0,
kExt2FileTypeRegular = 1,
kExt2FileTypeDirectory = 2,
kExt2FileTypeCharDevice = 3,
kExt2FileTypeBlockDevice = 4,
kExt2FileTypeFIFO = 5,
kExt2FileTypeSocket = 6,
kExt2FileTypeSymbolicLink = 7
};
struct PACKED EXT2_SUPER_BLOCK final
{
Kernel::UInt32 fInodeCount;
Kernel::UInt32 fBlockCount;
Kernel::UInt32 fReservedBlockCount;
Kernel::UInt32 fFreeBlockCount;
Kernel::UInt32 fFreeInodeCount;
Kernel::UInt32 fFirstDataBlock;
Kernel::UInt32 fLogBlockSize;
Kernel::UInt32 fLogFragmentSize;
Kernel::UInt32 fBlocksPerGroup;
Kernel::UInt32 fFragmentsPerGroup;
Kernel::UInt32 fInodesPerGroup;
Kernel::UInt32 fMountTime;
Kernel::UInt32 fWriteTime;
Kernel::UInt16 fMountCount;
Kernel::UInt16 fMaxMountCount;
Kernel::UInt16 fMagic; // should be 0xEF53
Kernel::UInt16 fState;
Kernel::UInt16 fErrors;
Kernel::UInt16 fMinorRevision;
Kernel::UInt32 fLastCheck;
Kernel::UInt32 fCheckInterval;
Kernel::UInt32 fCreatorOS;
Kernel::UInt32 fRevisionLevel;
Kernel::UInt16 fDefaultUID;
Kernel::UInt16 fDefaultGID;
// EXT2_DYNAMIC_REV fields
Kernel::UInt32 fFirstInode;
Kernel::UInt16 fInodeSize;
Kernel::UInt16 fBlockGroupNumber;
Kernel::UInt32 fFeatureCompat;
Kernel::UInt32 fFeatureIncompat;
Kernel::UInt32 fFeatureROCompat;
Kernel::UInt8 fUUID[16];
Kernel::Char fVolumeName[16];
Kernel::Char fLastMounted[64];
Kernel::UInt32 fAlgoBitmap;
// Optional journal fields and padding
Kernel::UInt8 fPreallocBlocks;
Kernel::UInt8 fPreallocDirBlocks;
Kernel::UInt16 fReservedGDTBlocks;
Kernel::UInt8 fJournalUUID[16];
Kernel::UInt32 fJournalInode;
Kernel::UInt32 fJournalDevice;
Kernel::UInt32 fLastOrphan;
Kernel::UInt32 fHashSeed[4];
Kernel::UInt8 fDefHashVersion;
Kernel::UInt8 fReservedCharPad;
Kernel::UInt16 fReservedWordPad;
Kernel::UInt32 fDefaultMountOpts;
Kernel::UInt32 fFirstMetaBlockGroup;
Kernel::UInt8 fReserved[760]; // Padding to make 1024 bytes
};
struct PACKED EXT2_INODE final
{
Kernel::UInt16 fMode;
Kernel::UInt16 fUID;
Kernel::UInt32 fSize;
Kernel::UInt32 fAccessTime;
Kernel::UInt32 fCreateTime;
Kernel::UInt32 fModifyTime;
Kernel::UInt32 fDeleteTime;
Kernel::UInt16 fGID;
Kernel::UInt16 fLinksCount;
Kernel::UInt32 fBlocks;
Kernel::UInt32 fFlags;
Kernel::UInt32 fOSD1;
Kernel::UInt32 fBlock[15]; // 0-11: direct, 12: indirect, 13: double indirect, 14: triple indirect
Kernel::UInt32 fGeneration;
Kernel::UInt32 fFileACL;
Kernel::UInt32 fDirACL; // Only for revision 1+
Kernel::UInt32 fFragmentAddr;
Kernel::UInt8 fOSD2[12];
};
struct PACKED EXT2_DIR_ENTRY final
{
Kernel::UInt32 fInode;
Kernel::UInt16 fRecordLength;
Kernel::UInt8 fNameLength;
Kernel::UInt8 fFileType;
Kernel::Char fName[kExt2FSMaxFileNameLen]; // null-terminated, not fixed-length in actual on-disk layout
};
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