mirror of
https://github.com/reactos/reactos.git
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115 lines
4.3 KiB
C
115 lines
4.3 KiB
C
/*************************************************************************
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*
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* File: ext2metadata.h
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*
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* Module: Ext2 File System Driver (Kernel mode execution only)
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*
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* Description:
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* Contains the definitions for the Ext2 Metadata structures.
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*
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* Author: Manoj Paul Joseph
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*
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*
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*************************************************************************/
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#ifndef EXT2_METADATA_STRUCTURES
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#define EXT2_METADATA_STRUCTURES
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//
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// Some type definitions...
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// These are used in the ext2_fs.h header file
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//
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typedef unsigned int __u32 ;
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typedef signed int __s32 ;
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typedef unsigned short int __u16 ;
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typedef signed short int __s16 ;
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typedef unsigned char __u8 ;
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//
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//******************************************************
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//
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// Using Remy Card's (slightly modified) Ext2 header...
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//
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#include "ext2_fs.h"
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//
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//******************************************************
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//
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typedef struct ext2_super_block EXT2_SUPER_BLOCK;
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typedef EXT2_SUPER_BLOCK * PEXT2_SUPER_BLOCK;
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typedef struct ext2_inode EXT2_INODE;
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typedef EXT2_INODE * PEXT2_INODE;
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typedef struct ext2_group_desc EXT2_GROUP_DESCRIPTOR;
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typedef EXT2_GROUP_DESCRIPTOR * PEXT2_GROUP_DESCRIPTOR;
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typedef struct ext2_dir_entry_2 EXT2_DIR_ENTRY;
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typedef EXT2_DIR_ENTRY * PEXT2_DIR_ENTRY;
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//
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// Ext2 Supported File Types...
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//
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#define IMODE_FIFO 0x01
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#define IMODE_CHARDEV 0x02
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#define IMODE_DIR 0x04
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#define IMODE_BLOCKDEV 0x06
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#define IMODE_FILE 0x08
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#define IMODE_SLINK 0x0A
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#define IMODE_SOCKET 0x0C
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#define _MKMODE(m) ( ( (m) >> 12 ) & 0x000F)
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#define Ext2IsModeRegularFile(m) ( _MKMODE(m) == IMODE_FILE )
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#define Ext2IsModeDirectory(m) ( _MKMODE(m) == IMODE_DIR )
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#define Ext2IsModeSymbolicLink(m) ( _MKMODE(m) == IMODE_SLINK )
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#define Ext2IsModePipe(m) ( _MKMODE(m) == IMODE_FIFO )
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#define Ext2IsModeCharacterDevice(m) ( _MKMODE(m) == IMODE_CHARDEV )
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#define Ext2IsModeBlockDevice(m) ( _MKMODE(m) == IMODE_BLOCKDEV )
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#define Ext2IsModeSocket(m) ( _MKMODE(m) == IMODE_SOCKET )
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#define Ext2IsModeHidden(m) ( (m & 0x124) == 0) // No Read Permission
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#define Ext2IsModeReadOnly(m) ( (m & 0x92) == 0) // No write Permission
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#define Ext2SetModeHidden(m) m = (m & (~0x124)); // Turn off Read Permission
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#define Ext2SetModeReadOnly(m) m = (m & (~0x92)); // Turn off write Permission
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#define Ext2SetModeReadWrite(m) m = (m & 0x1ff); // Set read/write Permission
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//
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// Define the Packed and Unpacked BIOS Parameter Block
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//
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typedef struct _PACKED_BIOS_PARAMETER_BLOCK {
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UCHAR BytesPerSector[2]; // offset = 0x000 0
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UCHAR SectorsPerCluster[1]; // offset = 0x002 2
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UCHAR ReservedSectors[2]; // offset = 0x003 3
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UCHAR Fats[1]; // offset = 0x005 5
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UCHAR RootEntries[2]; // offset = 0x006 6
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UCHAR Sectors[2]; // offset = 0x008 8
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UCHAR Media[1]; // offset = 0x00A 10
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UCHAR SectorsPerFat[2]; // offset = 0x00B 11
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UCHAR SectorsPerTrack[2]; // offset = 0x00D 13
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UCHAR Heads[2]; // offset = 0x00F 15
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UCHAR HiddenSectors[4]; // offset = 0x011 17
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UCHAR LargeSectors[4]; // offset = 0x015 21
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} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019 25
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typedef PACKED_BIOS_PARAMETER_BLOCK *PPACKED_BIOS_PARAMETER_BLOCK;
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//
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// Define the boot sector
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//
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typedef struct _PACKED_BOOT_SECTOR {
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UCHAR Jump[3]; // offset = 0x000 0
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UCHAR Oem[8]; // offset = 0x003 3
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PACKED_BIOS_PARAMETER_BLOCK PackedBpb; // offset = 0x00B 11
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UCHAR PhysicalDriveNumber; // offset = 0x024 36
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UCHAR CurrentHead; // offset = 0x025 37
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UCHAR Signature; // offset = 0x026 38
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UCHAR Id[4]; // offset = 0x027 39
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UCHAR VolumeLabel[11]; // offset = 0x02B 43
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UCHAR SystemId[8]; // offset = 0x036 54
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} PACKED_BOOT_SECTOR; // sizeof = 0x03E 62
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typedef PACKED_BOOT_SECTOR *PPACKED_BOOT_SECTOR;
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#endif
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