1 files changed, 129 insertions, 0 deletions
diff --git a/dev/kernel/FSKit/Ext2.h b/dev/kernel/FSKit/Ext2.h
new file mode 100644
index 00000000..81b6853e
--- /dev/null
+++ b/dev/kernel/FSKit/Ext2.h
@@ -0,0 +1,129 @@
+/* -------------------------------------------
+
+	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
+};
+\ No newline at end of file