一个碎片整理程序的实现

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申明：代码是网上收集的，原则上只供学习使用

//====================================================================

// Defrag.h

// Header file for defragmentation demonstration program. This file

// includes definitions for defragmentation File System Control

// commands, as well as the undocumented NtFsControl call.

//====================================================================

//--------------------------------------------------------------------

// D E F I N E S

//--------------------------------------------------------------------

// File System Control commands related to defragging

#define FSCTL_READ_MFT_RECORD 0x90068

#define FSCTL_GET_VOLUME_BITMAP 0x9006F

#define FSCTL_GET_RETRIEVAL_POINTERS 0x90073

#define FSCTL_MOVE_FILE 0x90074

// return code type

typedef UINT NTSTATUS;

// Error codes returned by NtFsControlFile (see NTSTATUS.H)

#define STATUS_SUCCESS ((NTSTATUS)0x00000000L)

#define STATUS_BUFFER_OVERFLOW ((NTSTATUS)0x80000005L)

#define STATUS_INVALID_PARAMETER ((NTSTATUS)0xC000000DL)

#define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L)

#define STATUS_ALREADY_COMMITTED ((NTSTATUS)0xC0000021L)

#define STATUS_INVALID_DEVICE_REQUEST ((NTSTATUS)0xC0000010L)

//--------------------------------------------------------------------

// F S C T L S P E C I F I C T Y P E D E F S

//--------------------------------------------------------------------

// This is the definition for a VCN/LCN (virtual cluster/logical cluster)

// mapping pair that is returned in the buffer passed to

// FSCTL_GET_RETRIEVAL_POINTERS

typedef struct {

ULONGLONG Vcn;

ULONGLONG Lcn;

} MAPPING_PAIR, *PMAPPING_PAIR;

// This is the definition for the buffer that FSCTL_GET_RETRIEVAL_POINTERS

// returns. It consists of a header followed by mapping pairs

typedef struct {

ULONG NumberOfPairs;

ULONGLONG StartVcn;

MAPPING_PAIR Pair[1];

} GET_RETRIEVAL_DESCRIPTOR, *PGET_RETRIEVAL_DESCRIPTOR;

// This is the definition of the buffer that FSCTL_GET_VOLUME_BITMAP

// returns. It consists of a header followed by the actual bitmap data

typedef struct {

ULONGLONG StartLcn;

ULONGLONG ClustersToEndOfVol;

BYTE Map[1];

} BITMAP_DESCRIPTOR, *PBITMAP_DESCRIPTOR;

// This is the definition for the data structure that is passed in to

// FSCTL_MOVE_FILE

typedef struct {

HANDLE FileHandle;

ULONG Reserved;

LARGE_INTEGER StartVcn;

LARGE_INTEGER TargetLcn;

ULONG NumVcns;

ULONG Reserved1;

} MOVEFILE_DESCRIPTOR, *PMOVEFILE_DESCRIPTOR;

//--------------------------------------------------------------------

// N T F S C O N T R O L F I L E D E F I N I T I O N S

//--------------------------------------------------------------------

// Prototype for NtFsControlFile and data structures

// used in its definition

// Io Status block (see NTDDK.H)

typedef struct _IO_STATUS_BLOCK {

NTSTATUS Status;

ULONG Information;

} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;

// Apc Routine (see NTDDK.H)

typedef VOID (*PIO_APC_ROUTINE) (

PVOID ApcContext,

PIO_STATUS_BLOCK IoStatusBlock,

ULONG Reserved

);

// The undocumented NtFsControlFile

// This function is used to send File System Control (FSCTL)

// commands into file system drivers. Its definition is

// in ntdll.dll (ntdll.lib), a file shipped with the NTDDK.

NTSTATUS (__stdcall *NtFsControlFile)(

HANDLE FileHandle,

HANDLE Event, // optional

PIO_APC_ROUTINE ApcRoutine, // optional

PVOID ApcContext, // optional

PIO_STATUS_BLOCK IoStatusBlock,

ULONG FsControlCode,

PVOID InputBuffer, // optional

ULONG InputBufferLength,

PVOID OutputBuffer, // optional

ULONG OutputBufferLength

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