fastio.c File Reference

#include <ntddk.h>
#include <debug.h>
#include "ntfs.h"

Include dependency graph for fastio.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
BOOLEAN NTAPI	NtfsAcqLazyWrite (_In_ PVOID Context, _In_ BOOLEAN Wait)
VOID NTAPI	NtfsRelLazyWrite (_In_ PVOID Context)
BOOLEAN NTAPI	NtfsAcqReadAhead (_In_ PVOID Context, _In_ BOOLEAN Wait)
VOID NTAPI	NtfsRelReadAhead (_In_ PVOID Context)
BOOLEAN NTAPI	NtfsFastIoCheckIfPossible (_In_ PFILE_OBJECT FileObject, _In_ PLARGE_INTEGER FileOffset, _In_ ULONG Length, _In_ BOOLEAN Wait, _In_ ULONG LockKey, _In_ BOOLEAN CheckForReadOperation, _Out_ PIO_STATUS_BLOCK IoStatus, _In_ PDEVICE_OBJECT DeviceObject)
BOOLEAN NTAPI	NtfsFastIoRead (_In_ PFILE_OBJECT FileObject, _In_ PLARGE_INTEGER FileOffset, _In_ ULONG Length, _In_ BOOLEAN Wait, _In_ ULONG LockKey, _Out_ PVOID Buffer, _Out_ PIO_STATUS_BLOCK IoStatus, _In_ PDEVICE_OBJECT DeviceObject)
BOOLEAN NTAPI	NtfsFastIoWrite (_In_ PFILE_OBJECT FileObject, _In_ PLARGE_INTEGER FileOffset, _In_ ULONG Length, _In_ BOOLEAN Wait, _In_ ULONG LockKey, _In_ PVOID Buffer, _Out_ PIO_STATUS_BLOCK IoStatus, _In_ PDEVICE_OBJECT DeviceObject)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 30 of file fastio.c.

Function Documentation

NtfsAcqLazyWrite()

BOOLEAN NTAPI NtfsAcqLazyWrite	(	_In_ PVOID	Context,
		_In_ BOOLEAN	Wait
	)

Definition at line 39 of file fastio.c.

{
    PNTFS_FCB Fcb = (PNTFS_FCB)Context;
 
    ASSERT(Fcb->Identifier.Type == NTFS_TYPE_FCB);
 
    /* The paging writes below take it shared as well, size changes exclude us */
    if (!ExAcquireResourceSharedLite(&Fcb->PagingIoResource, Wait))
        return FALSE;
 
    /* Let Cc know it doesn't have to acquire the file again for the flush */
    if (IoGetTopLevelIrp() == NULL)
        IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
 
    return TRUE;
}

Referenced by DriverEntry().

NtfsAcqReadAhead()

BOOLEAN NTAPI NtfsAcqReadAhead	(	_In_ PVOID	Context,
		_In_ BOOLEAN	Wait
	)

Definition at line 77 of file fastio.c.

{
    PNTFS_FCB Fcb = (PNTFS_FCB)Context;
 
    ASSERT(Fcb->Identifier.Type == NTFS_TYPE_FCB);
 
    /* Keep size changes out while we read ahead */
    if (!ExAcquireResourceSharedLite(&Fcb->MainResource, Wait))
        return FALSE;
 
    if (IoGetTopLevelIrp() == NULL)
        IoSetTopLevelIrp((PIRP)FSRTL_CACHE_TOP_LEVEL_IRP);
 
    return TRUE;
}

Referenced by DriverEntry().

NtfsFastIoCheckIfPossible()

BOOLEAN NTAPI NtfsFastIoCheckIfPossible	(	_In_ PFILE_OBJECT	FileObject,
		_In_ PLARGE_INTEGER	FileOffset,
		_In_ ULONG	Length,
		_In_ BOOLEAN	Wait,
		_In_ ULONG	LockKey,
		_In_ BOOLEAN	CheckForReadOperation,
		_Out_ PIO_STATUS_BLOCK	IoStatus,
		_In_ PDEVICE_OBJECT	DeviceObject
	)

Definition at line 113 of file fastio.c.

{
    PNTFS_FCB Fcb = (PNTFS_FCB)FileObject->FsContext;
    LARGE_INTEGER LargeLength;
 
    UNREFERENCED_PARAMETER(Wait);
    UNREFERENCED_PARAMETER(IoStatus);
 
    LargeLength.QuadPart = Length;
    UNREFERENCED_PARAMETER(DeviceObject);
 
    if (!NtfsIsRegularFileObject(FileObject))
        return FALSE;
 
    if (NtfsFCBIsCompressed(Fcb) || NtfsFCBIsEncrypted(Fcb) ||
        (Fcb->Vcb->Flags & VCB_VOLUME_DISMOUNTED))
    {
        return FALSE;
    }
 
    if (CheckForReadOperation)
    {
        return FsRtlFastCheckLockForRead(&Fcb->FileLock, FileOffset, &LargeLength, LockKey,
                                         FileObject, PsGetCurrentProcess());
    }
 
    if (!NtfsGlobalData->EnableWriteSupport ||
        !FsRtlFastCheckLockForWrite(&Fcb->FileLock, FileOffset, &LargeLength, LockKey,
                                    FileObject, PsGetCurrentProcess()))
    {
        return FALSE;
    }
 
    /* Growing the file updates its record, leave that to the IRP path */
    return (FileOffset->QuadPart + Length <= Fcb->RFCB.FileSize.QuadPart);
}

NtfsFastIoRead()

BOOLEAN NTAPI NtfsFastIoRead	(	_In_ PFILE_OBJECT	FileObject,
		_In_ PLARGE_INTEGER	FileOffset,
		_In_ ULONG	Length,
		_In_ BOOLEAN	Wait,
		_In_ ULONG	LockKey,
		_Out_ PVOID	Buffer,
		_Out_ PIO_STATUS_BLOCK	IoStatus,
		_In_ PDEVICE_OBJECT	DeviceObject
	)

Definition at line 160 of file fastio.c.

{
    if (!NtfsIsRegularFileObject(FileObject))
        return FALSE;
 
    return FsRtlCopyRead(FileObject, FileOffset, Length, Wait, LockKey, Buffer, IoStatus, DeviceObject);
}

NtfsFastIoWrite()

BOOLEAN NTAPI NtfsFastIoWrite	(	_In_ PFILE_OBJECT	FileObject,
		_In_ PLARGE_INTEGER	FileOffset,
		_In_ ULONG	Length,
		_In_ BOOLEAN	Wait,
		_In_ ULONG	LockKey,
		_In_ PVOID	Buffer,
		_Out_ PIO_STATUS_BLOCK	IoStatus,
		_In_ PDEVICE_OBJECT	DeviceObject
	)

Definition at line 178 of file fastio.c.

{
    if (!NtfsIsRegularFileObject(FileObject) || !NtfsGlobalData->EnableWriteSupport)
        return FALSE;
 
    return FsRtlCopyWrite(FileObject, FileOffset, Length, Wait, LockKey, Buffer, IoStatus, DeviceObject);
}

NtfsRelLazyWrite()

VOID NTAPI NtfsRelLazyWrite

(

_In_ PVOID

Context

)

Definition at line 61 of file fastio.c.

{
    PNTFS_FCB Fcb = (PNTFS_FCB)Context;
 
    ASSERT(Fcb->Identifier.Type == NTFS_TYPE_FCB);
 
    if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
        IoSetTopLevelIrp(NULL);
 
    ExReleaseResourceLite(&Fcb->PagingIoResource);
}

Referenced by DriverEntry().

NtfsRelReadAhead()

VOID NTAPI NtfsRelReadAhead

(

_In_ PVOID

Context

)

Definition at line 98 of file fastio.c.

{
    PNTFS_FCB Fcb = (PNTFS_FCB)Context;
 
    ASSERT(Fcb->Identifier.Type == NTFS_TYPE_FCB);
 
    if (IoGetTopLevelIrp() == (PIRP)FSRTL_CACHE_TOP_LEVEL_IRP)
        IoSetTopLevelIrp(NULL);
 
    ExReleaseResourceLite(&Fcb->MainResource);
}

Referenced by DriverEntry().