misc.c File Reference

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

Include dependency graph for misc.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
BOOLEAN	NtfsIsIrpTopLevel (PIRP Irp)
PNTFS_IRP_CONTEXT	NtfsAllocateIrpContext (PDEVICE_OBJECT DeviceObject, PIRP Irp)
VOID	NtfsFileFlagsToAttributes (ULONG NtfsAttributes, PULONG FileAttributes)
PVOID	NtfsGetUserBuffer (PIRP Irp, BOOLEAN Paging)
NtfsLockUserBuffer
@implemented Ensures the IRP has an MDL Address. Parameters Irp Irp with the UserBuffer that needs locking Length Size of the Irp->UserBuffer, in bytes Operation What kind of access does the driver need to the buffer. Set to IoReadAccess, IoWriteAccess, or IoModifyAccess. Returns STATUS_SUCCESS in case of success, STATUS_INSUFFICIENT_RESOURCES or an exception code otherwise. Remarks Trevor Thompson shamelessly ripped this from VfatLockUserBuffer(). Only the name was changed.
NTSTATUS	NtfsLockUserBuffer (IN PIRP Irp, IN ULONG Length, IN LOCK_OPERATION Operation)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 31 of file misc.c.

Function Documentation

NtfsAllocateIrpContext()

PNTFS_IRP_CONTEXT NtfsAllocateIrpContext	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 66 of file misc.c.

{
    PNTFS_IRP_CONTEXT IrpContext;
 
    TRACE_(NTFS, "NtfsAllocateIrpContext()\n");
 
    IrpContext = (PNTFS_IRP_CONTEXT)ExAllocateFromNPagedLookasideList(&NtfsGlobalData->IrpContextLookasideList);
    if (IrpContext == NULL)
        return NULL;
 
    RtlZeroMemory(IrpContext, sizeof(NTFS_IRP_CONTEXT));
 
    IrpContext->Identifier.Type = NTFS_TYPE_IRP_CONTEXT;
    IrpContext->Identifier.Size = sizeof(NTFS_IRP_CONTEXT);
    IrpContext->Irp = Irp;
    IrpContext->DeviceObject = DeviceObject;
    IrpContext->Stack = IoGetCurrentIrpStackLocation(Irp);
    IrpContext->MajorFunction = IrpContext->Stack->MajorFunction;
    IrpContext->MinorFunction = IrpContext->Stack->MinorFunction;
    IrpContext->FileObject = IrpContext->Stack->FileObject;
    IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
    IrpContext->PriorityBoost = IO_NO_INCREMENT;
    IrpContext->Flags = IRPCONTEXT_COMPLETE;
 
    if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL ||
        IrpContext->MajorFunction == IRP_MJ_DEVICE_CONTROL ||
        IrpContext->MajorFunction == IRP_MJ_SHUTDOWN ||
        (IrpContext->MajorFunction != IRP_MJ_CLEANUP &&
         IrpContext->MajorFunction != IRP_MJ_CLOSE &&
         IoIsOperationSynchronous(Irp)))
    {
        IrpContext->Flags |= IRPCONTEXT_CANWAIT;
    }
 
    return IrpContext;
}

Referenced by NtfsFsdDispatch().

NtfsFileFlagsToAttributes()

VOID NtfsFileFlagsToAttributes	(	ULONG	NtfsAttributes,
		PULONG	FileAttributes
	)

Definition at line 105 of file misc.c.

{
    *FileAttributes = NtfsAttributes;
    if ((NtfsAttributes & NTFS_FILE_TYPE_DIRECTORY) == NTFS_FILE_TYPE_DIRECTORY)
    {
        *FileAttributes = NtfsAttributes & ~NTFS_FILE_TYPE_DIRECTORY;
        *FileAttributes |= FILE_ATTRIBUTE_DIRECTORY;
    }
 
    if (NtfsAttributes == 0)
        *FileAttributes = FILE_ATTRIBUTE_NORMAL;
}

Referenced by NtfsGetBasicInformation(), NtfsGetBothDirectoryInformation(), NtfsGetDirectoryInformation(), NtfsGetFullDirectoryInformation(), and NtfsGetNetworkOpenInformation().

NtfsGetUserBuffer()

PVOID NtfsGetUserBuffer	(	PIRP	Irp,
		BOOLEAN	Paging
	)

Definition at line 120 of file misc.c.

{
    if (Irp->MdlAddress != NULL)
    {
        return MmGetSystemAddressForMdlSafe(Irp->MdlAddress, (Paging ? HighPagePriority : NormalPagePriority));
    }
    else
    {
        return Irp->UserBuffer;
    }
}

Referenced by GetVolumeBitmap(), NtfsQueryDirectory(), NtfsRead(), and NtfsWrite().

NtfsIsIrpTopLevel()

BOOLEAN NtfsIsIrpTopLevel

(

PIRP

Irp

)

Definition at line 43 of file misc.c.

{
    BOOLEAN ReturnCode = FALSE;
 
    TRACE_(NTFS, "NtfsIsIrpTopLevel()\n");
 
    if (IoGetTopLevelIrp() == NULL)
    {
        IoSetTopLevelIrp(Irp);
        ReturnCode = TRUE;
    }
 
    return ReturnCode;
}

Referenced by NtfsDispatch().

NtfsLockUserBuffer()

NTSTATUS NtfsLockUserBuffer	(	IN PIRP	Irp,
		IN ULONG	Length,
		IN LOCK_OPERATION	Operation
	)

Definition at line 158 of file misc.c.

{
    ASSERT(Irp);
 
    if (Irp->MdlAddress)
    {
        return STATUS_SUCCESS;
    }
 
    IoAllocateMdl(Irp->UserBuffer, Length, FALSE, FALSE, Irp);
 
    if (!Irp->MdlAddress)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    _SEH2_TRY
    {
        MmProbeAndLockPages(Irp->MdlAddress, Irp->RequestorMode, Operation);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        IoFreeMdl(Irp->MdlAddress);
        Irp->MdlAddress = NULL;
        _SEH2_YIELD(return _SEH2_GetExceptionCode());
    }
    _SEH2_END;
 
    return STATUS_SUCCESS;
}

Referenced by NtfsWrite().