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// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
// Licensed under the Apache License, Version 2.0 (see LICENSE file)
// Official repository: https://github.com/nekernel-org/nekernel
#ifndef FSKIT_EXT2_H
#define FSKIT_EXT2_H
#include <CompilerKit/CompilerKit.h>
#include <KernelKit/DriveMgr.h>
#include <NeKit/Config.h>
#include <NeKit/KString.h>
#include <hint/CompilerHint.h>
/// @file Ext2.h
/// @brief EXT2 filesystem structures, constants, and base wrappers.
/// EXT2 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)
/// EXT2 file types
enum {
kExt2FileTypeUnknown = 0,
kExt2FileTypeRegular = 1,
kExt2FileTypeDirectory = 2,
kExt2FileTypeCharDevice = 3,
kExt2FileTypeBlockDevice = 4,
kExt2FileTypeFIFO = 5,
kExt2FileTypeSocket = 6,
kExt2FileTypeSymbolicLink = 7
};
typedef struct EXT2_GROUP_DESCRIPTOR final {
UInt32 fBlockBitmap;
UInt32 fInodeBitmap;
UInt32 fInodeTable;
UInt16 fFreeBlocksCount;
UInt16 fFreeInodesCount;
UInt16 fBgUsedDirsCount;
UInt16 fBgPad;
UInt32 fBgReserved[3];
} EXT2_GROUP_DESCRIPTOR;
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;
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;
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]; // direct 0-11, indirect 12, double 13, triple 14
Kernel::UInt32 fGeneration;
Kernel::UInt32 fFileACL;
Kernel::UInt32 fDirACL;
Kernel::UInt32 fFragmentAddr;
Kernel::UInt8 fOSD2[12];
};
/// Directory entry
struct PACKED EXT2_DIR_ENTRY final {
Kernel::UInt32 fInode;
Kernel::UInt16 fRecordLength;
Kernel::UInt8 fNameLength;
Kernel::UInt8 fFileType;
Kernel::Char fName[kExt2FSMaxFileNameLen];
};
/// VFS usage
struct Ext2Node {
Kernel::UInt32 inodeNumber;
EXT2_INODE inode;
Kernel::UInt32 cursor{0};
};
#endif
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