136 lines
5.1 KiB
C
136 lines
5.1 KiB
C
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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ntfs_rec.h
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Abstract:
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This module contains the mini-file system recognizer for NTFS.
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Author:
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Darryl E. Havens (darrylh) 8-dec-1992
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Environment:
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Kernel mode, local to I/O system
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Revision History:
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--*/
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//
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// The fundamental unit of allocation on an Ntfs volume is the
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// cluster. Format guarantees that the cluster size is an integral
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// power of two times the physical sector size of the device. Ntfs
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// reserves 64-bits to describe a cluster, in order to support
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// large disks. The LCN represents a physical cluster number on
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// the disk, and the VCN represents a virtual cluster number within
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// an attribute.
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//
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typedef LARGE_INTEGER LCN;
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typedef LCN *PLCN;
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typedef LARGE_INTEGER VCN;
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typedef VCN *PVCN;
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typedef LARGE_INTEGER LBO;
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typedef LBO *PLBO;
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typedef LARGE_INTEGER VBO;
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typedef VBO *PVBO;
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//
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// The boot sector is duplicated on the partition. The first copy
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// is on the first physical sector (LBN == 0) of the partition, and
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// the second copy is at <number sectors on partition> / 2. If the
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// first copy can not be read when trying to mount the disk, the
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// second copy may be read and has the identical contents. Format
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// must figure out which cluster the second boot record belongs in,
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// and it must zero all of the other sectors that happen to be in
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// the same cluster. The boot file minimally contains with two
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// clusters, which are the two clusters which contain the copies of
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// the boot record. If format knows that some system likes to put
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// code somewhere, then it should also align this requirement to
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// even clusters, and add that to the boot file as well.
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//
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// Part of the sector contains a BIOS Parameter Block. The BIOS in
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// the sector is packed (i.e., unaligned) so we'll supply an
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// unpacking macro to translate a packed BIOS into its unpacked
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// equivalent. The unpacked BIOS structure is already defined in
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// ntioapi.h so we only need to define the packed BIOS.
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//
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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
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UCHAR SectorsPerCluster[1]; // offset = 0x002
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UCHAR ReservedSectors[2]; // offset = 0x003 (zero)
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UCHAR Fats[1]; // offset = 0x005 (zero)
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UCHAR RootEntries[2]; // offset = 0x006 (zero)
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UCHAR Sectors[2]; // offset = 0x008 (zero)
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UCHAR Media[1]; // offset = 0x00A
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UCHAR SectorsPerFat[2]; // offset = 0x00B (zero)
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UCHAR SectorsPerTrack[2]; // offset = 0x00D
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UCHAR Heads[2]; // offset = 0x00F
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UCHAR HiddenSectors[4]; // offset = 0x011 (zero)
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UCHAR LargeSectors[4]; // offset = 0x015 (zero)
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} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019
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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. Note that MFT2 is exactly three file
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// record segments long, and it mirrors the first three file record
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// segments from the MFT, which are MFT, MFT2 and the Log File.
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//
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// The Oem field contains the ASCII characters "NTFS ".
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//
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// The Checksum field is a simple additive checksum of all of the
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// ULONGs which precede the Checksum ULONG. The rest of the sector
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// is not included in this Checksum.
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//
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typedef struct _PACKED_BOOT_SECTOR {
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UCHAR Jump[3]; // offset = 0x000
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UCHAR Oem[8]; // offset = 0x003
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PACKED_BIOS_PARAMETER_BLOCK PackedBpb; // offset = 0x00B
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UCHAR Unused[4]; // offset = 0x024
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LARGE_INTEGER NumberSectors; // offset = 0x028
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LCN MftStartLcn; // offset = 0x030
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LCN Mft2StartLcn; // offset = 0x038
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CHAR ClustersPerFileRecordSegment; // offset = 0x040
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UCHAR Reserved0[3];
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CHAR DefaultClustersPerIndexAllocationBuffer; // offset = 0x044
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UCHAR Reserved1[3];
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LARGE_INTEGER SerialNumber; // offset = 0x048
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ULONG Checksum; // offset = 0x050
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UCHAR BootStrap[0x200-0x054]; // offset = 0x054
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} PACKED_BOOT_SECTOR; // sizeof = 0x200
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typedef PACKED_BOOT_SECTOR *PPACKED_BOOT_SECTOR;
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//
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// Define the functions provided by this driver.
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//
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BOOLEAN
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IsNtfsVolume(
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IN PPACKED_BOOT_SECTOR BootSector,
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IN ULONG BytesPerSector,
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IN PLARGE_INTEGER NumberOfSectors
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);
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