block.c File Reference

#include "ext2fs.h"

Include dependency graph for block.c:

Go to the source code of this file.

Functions
NTSTATUS NTAPI	Ext2ReadWriteBlockSyncCompletionRoutine (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PVOID Context)
NTSTATUS NTAPI	Ext2ReadWriteBlockAsyncCompletionRoutine (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PVOID Context)
NTSTATUS NTAPI	Ext2MediaEjectControlCompletion (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PVOID Contxt)
PMDL	Ext2CreateMdl (IN PVOID Buffer, IN ULONG Length, IN LOCK_OPERATION op)
VOID	Ext2DestroyMdl (IN PMDL Mdl)
NTSTATUS	Ext2LockUserBuffer (IN PIRP Irp, IN ULONG Length, IN LOCK_OPERATION Operation)
PVOID	Ext2GetUserBuffer (IN PIRP Irp)
NTSTATUS	Ext2ReadWriteBlocks (IN PEXT2_IRP_CONTEXT IrpContext, IN PEXT2_VCB Vcb, IN PEXT2_EXTENT Chain, IN ULONG Length)
NTSTATUS	Ext2ReadSync (IN PEXT2_VCB Vcb, IN ULONGLONG Offset, IN ULONG Length, OUT PVOID Buffer, BOOLEAN bVerify)
NTSTATUS	Ext2ReadDisk (IN PEXT2_VCB Vcb, IN ULONGLONG Offset, IN ULONG Size, IN PVOID Buffer, IN BOOLEAN bVerify)
NTSTATUS	Ext2DiskIoControl (IN PDEVICE_OBJECT DeviceObject, IN ULONG IoctlCode, IN PVOID InputBuffer, IN ULONG InputBufferSize, IN OUT PVOID OutputBuffer, IN OUT PULONG OutputBufferSize)
VOID	Ext2MediaEjectControl (IN PEXT2_IRP_CONTEXT IrpContext, IN PEXT2_VCB Vcb, IN BOOLEAN bPrevent)
NTSTATUS	Ext2DiskShutDown (PEXT2_VCB Vcb)

Variables
PEXT2_GLOBAL	Ext2Global

Function Documentation

Ext2CreateMdl()

PMDL Ext2CreateMdl	(	IN PVOID	Buffer,
		IN ULONG	Length,
		IN LOCK_OPERATION	op
	)

Definition at line 52 of file block.c.

{
    NTSTATUS Status;
    PMDL Mdl = NULL;

    ASSERT (Buffer != NULL);
    Mdl = IoAllocateMdl (Buffer, Length, FALSE, FALSE, NULL);
    if (Mdl == NULL) {
        Status = STATUS_INSUFFICIENT_RESOURCES;
    } else {
        _SEH2_TRY {
            if (MmIsNonPagedSystemAddressValid(Buffer)) {
                MmBuildMdlForNonPagedPool(Mdl);
            } else {
                MmProbeAndLockPages(Mdl, KernelMode, op);
            }
            Status = STATUS_SUCCESS;
        } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
            IoFreeMdl (Mdl);
            Mdl = NULL;
            DbgBreak();
            Status = STATUS_INVALID_USER_BUFFER;
        } _SEH2_END;
    }
    return Mdl;
}

Referenced by get_block_bh_mdl().

Ext2DestroyMdl()

VOID Ext2DestroyMdl

(

IN PMDL

Mdl

)

Definition at line 85 of file block.c.

{
    ASSERT (Mdl != NULL);
    while (Mdl) {
        PMDL Next;
        Next = Mdl->Next;
        Mdl->Next = NULL;
        if (IsFlagOn(Mdl->MdlFlags, MDL_PAGES_LOCKED)) {
            MmUnlockPages (Mdl);
        }
        IoFreeMdl (Mdl);
        Mdl = Next;
    }
}

Referenced by free_buffer_head().

Ext2DiskIoControl()

NTSTATUS Ext2DiskIoControl	(	IN PDEVICE_OBJECT	DeviceObject,
		IN ULONG	IoctlCode,
		IN PVOID	InputBuffer,
		IN ULONG	InputBufferSize,
		IN OUT PVOID	OutputBuffer,
		IN OUT PULONG	OutputBufferSize
	)

Definition at line 589 of file block.c.

{
    ULONG           OutBufferSize = 0;
    KEVENT          Event;
    PIRP            Irp;
    IO_STATUS_BLOCK IoStatus;
    NTSTATUS        Status;

    ASSERT(DeviceObject != NULL);

    if (OutputBufferSize)
    {
        OutBufferSize = *OutputBufferSize;
    }

    KeInitializeEvent(&Event, NotificationEvent, FALSE);

    Irp = IoBuildDeviceIoControlRequest(
              IoctlCode,
              DeviceObject,
              InputBuffer,
              InputBufferSize,
              OutputBuffer,
              OutBufferSize,
              FALSE,
              &Event,
              &IoStatus
          );

    if (Irp == NULL) {
        DEBUG(DL_ERR, ( "Ext2DiskIoControl: failed to build Irp!\n"));
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    Status = IoCallDriver(DeviceObject, Irp);

    if (Status == STATUS_PENDING)  {
        KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
        Status = IoStatus.Status;
    }

    if (OutputBufferSize) {
        *OutputBufferSize = (ULONG)(IoStatus.Information);
    }

    return Status;
}

Referenced by Ext2InitializeVcb(), Ext2MountVolume(), Ext2VerifyVcb(), and Ext2VerifyVolume().

Ext2DiskShutDown()

NTSTATUS Ext2DiskShutDown

(

PEXT2_VCB

Vcb

)

Definition at line 724 of file block.c.

{
    PIRP                Irp;
    KEVENT              Event;

    NTSTATUS            Status;
    IO_STATUS_BLOCK     IoStatus;

    KeInitializeEvent(&Event, NotificationEvent, FALSE);

    Irp = IoBuildSynchronousFsdRequest(IRP_MJ_SHUTDOWN,
                                       Vcb->TargetDeviceObject,
                                       NULL,
                                       0,
                                       NULL,
                                       &Event,
                                       &IoStatus);

    if (Irp) {
        Status = IoCallDriver(Vcb->TargetDeviceObject, Irp);

        if (Status == STATUS_PENDING) {
            KeWaitForSingleObject(&Event,
                                  Executive,
                                  KernelMode,
                                  FALSE,
                                  NULL);

            Status = IoStatus.Status;
        }
    } else  {
        Status = IoStatus.Status;
    }

    return Status;
}

Referenced by Ext2ShutDown().

Ext2GetUserBuffer()

PVOID Ext2GetUserBuffer

(

IN PIRP

Irp

)

Definition at line 134 of file block.c.

{
    ASSERT(Irp != NULL);

    if (Irp->MdlAddress) {

#if (_WIN32_WINNT >= 0x0500)
        return MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
#else
        return MmGetSystemAddressForMdl(Irp->MdlAddress);
#endif
    } else {

        return Irp->UserBuffer;
    }
}

Referenced by Ext2GetRetrievalPointerBase(), Ext2GetRetrievalPointers(), Ext2QueryDirectory(), Ext2QueryEa(), Ext2ReadFile(), Ext2ReadInode(), Ext2ReadVolume(), Ext2WriteFile(), and Ext2WriteVolume().

Ext2LockUserBuffer()

NTSTATUS Ext2LockUserBuffer	(	IN PIRP	Irp,
		IN ULONG	Length,
		IN LOCK_OPERATION	Operation
	)

Definition at line 101 of file block.c.

{
    NTSTATUS Status;
    ASSERT(Irp != NULL);

    if (Irp->MdlAddress != NULL) {
        return STATUS_SUCCESS;
    }

    IoAllocateMdl(Irp->UserBuffer, Length, FALSE, FALSE, Irp);
    if (Irp->MdlAddress == NULL) {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    _SEH2_TRY {

        MmProbeAndLockPages(Irp->MdlAddress, Irp->RequestorMode, Operation);
        Status = STATUS_SUCCESS;

    } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {

        DbgBreak();
        IoFreeMdl(Irp->MdlAddress);
        Irp->MdlAddress = NULL;
        Status = STATUS_INVALID_USER_BUFFER;
    } _SEH2_END;

    return Status;
}

Referenced by Ext2LockIrp(), Ext2QueryDirectory(), Ext2ReadFile(), Ext2ReadVolume(), Ext2WriteFile(), and Ext2WriteVolume().

Ext2MediaEjectControl()

VOID Ext2MediaEjectControl	(	IN PEXT2_IRP_CONTEXT	IrpContext,
		IN PEXT2_VCB	Vcb,
		IN BOOLEAN	bPrevent
	)

Definition at line 661 of file block.c.

{
    PIRP                    Irp;
    KEVENT                  Event;
    NTSTATUS                Status;
    PREVENT_MEDIA_REMOVAL   Prevent;
    IO_STATUS_BLOCK         IoStatus;


    ExAcquireResourceExclusiveLite(
        &Vcb->MainResource,
        TRUE            );

    if (bPrevent != IsFlagOn(Vcb->Flags, VCB_REMOVAL_PREVENTED)) {
        if (bPrevent) {
            SetFlag(Vcb->Flags, VCB_REMOVAL_PREVENTED);
        } else {
            ClearFlag(Vcb->Flags, VCB_REMOVAL_PREVENTED);
        }
    }

    ExReleaseResourceLite(&Vcb->MainResource);

    Prevent.PreventMediaRemoval = bPrevent;

    KeInitializeEvent( &Event, NotificationEvent, FALSE );

    Irp = IoBuildDeviceIoControlRequest( IOCTL_DISK_MEDIA_REMOVAL,
                                         Vcb->TargetDeviceObject,
                                         &Prevent,
                                         sizeof(PREVENT_MEDIA_REMOVAL),
                                         NULL,
                                         0,
                                         FALSE,
                                         NULL,
                                         &IoStatus );

    if (Irp != NULL) {
        IoSetCompletionRoutine( Irp,
                                Ext2MediaEjectControlCompletion,
                                &Event,
                                TRUE,
                                TRUE,
                                TRUE );

        Status = IoCallDriver(Vcb->TargetDeviceObject, Irp);

        if (Status == STATUS_PENDING) {
            Status = KeWaitForSingleObject( &Event,
                                            Executive,
                                            KernelMode,
                                            FALSE,
                                            NULL );
        }
    }
}

Ext2MediaEjectControlCompletion()

NTSTATUS NTAPI Ext2MediaEjectControlCompletion	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp,
		IN PVOID	Contxt
	)

Definition at line 645 of file block.c.

{
    PKEVENT Event = (PKEVENT)Contxt;

    KeSetEvent( Event, 0, FALSE );

    UNREFERENCED_PARAMETER( DeviceObject );

    return STATUS_SUCCESS;
}

Referenced by Ext2MediaEjectControl().

Ext2ReadDisk()

NTSTATUS Ext2ReadDisk	(	IN PEXT2_VCB	Vcb,
		IN ULONGLONG	Offset,
		IN ULONG	Size,
		IN PVOID	Buffer,
		IN BOOLEAN	bVerify
	)

Definition at line 539 of file block.c.

{
    NTSTATUS    Status;
    PUCHAR      Buf;
    ULONG       Length;
    ULONGLONG   Lba;

    Lba = Offset & (~((ULONGLONG)SECTOR_SIZE - 1));
    Length = (ULONG)(Size + Offset + SECTOR_SIZE - 1 - Lba) &
             (~((ULONG)SECTOR_SIZE - 1));

    Buf = Ext2AllocatePool(PagedPool, Length, EXT2_DATA_MAGIC);
    if (!Buf) {
        DEBUG(DL_ERR, ( "Ext2ReadDisk: failed to allocate Buffer.\n"));
        Status = STATUS_INSUFFICIENT_RESOURCES;

        goto errorout;
    }
    INC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);

    Status = Ext2ReadSync(  Vcb,
                            Lba,
                            Length,
                            Buf,
                            FALSE );

    if (!NT_SUCCESS(Status)) {
        DEBUG(DL_ERR, ("Ext2ReadDisk: disk i/o error: %xh.\n", Status));
        goto errorout;
    }

    RtlCopyMemory(Buffer, &Buf[Offset - Lba], Size);

errorout:

    if (Buf) {
        Ext2FreePool(Buf, EXT2_DATA_MAGIC);
        DEC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);
    }

    return Status;
}

Referenced by ext2_load_inode(), ext2_read_block(), ext2_read_inode(), Ext2LoadSuper(), read_bitmaps(), and zap_sector().

Ext2ReadSync()

NTSTATUS Ext2ReadSync	(	IN PEXT2_VCB	Vcb,
		IN ULONGLONG	Offset,
		IN ULONG	Length,
		OUT PVOID	Buffer,
		BOOLEAN	bVerify
	)

Definition at line 460 of file block.c.

{
    PKEVENT         Event = NULL;

    PIRP            Irp;
    IO_STATUS_BLOCK IoStatus;
    NTSTATUS        Status = STATUS_INSUFFICIENT_RESOURCES;


    ASSERT(Vcb != NULL);
    ASSERT(Vcb->TargetDeviceObject != NULL);
    ASSERT(Buffer != NULL);

    _SEH2_TRY {

        Event = Ext2AllocatePool(NonPagedPool, sizeof(KEVENT), 'EK2E');

        if (NULL == Event) {
            DEBUG(DL_ERR, ( "Ex2ReadSync: failed to allocate Event.\n"));
            _SEH2_LEAVE;
        }

        INC_MEM_COUNT(PS_DISK_EVENT, Event, sizeof(KEVENT));

        KeInitializeEvent(Event, NotificationEvent, FALSE);

        Irp = IoBuildSynchronousFsdRequest(
                  IRP_MJ_READ,
                  Vcb->TargetDeviceObject,
                  Buffer,
                  Length,
                  (PLARGE_INTEGER)(&Offset),
                  Event,
                  &IoStatus
              );

        if (!Irp) {
            Status = STATUS_INSUFFICIENT_RESOURCES;
            _SEH2_LEAVE;
        }

        if (bVerify) {
            SetFlag( IoGetNextIrpStackLocation(Irp)->Flags,
                     SL_OVERRIDE_VERIFY_VOLUME );
        }

        Status = IoCallDriver(Vcb->TargetDeviceObject, Irp);

        if (Status == STATUS_PENDING) {
            KeWaitForSingleObject(
                Event,
                Suspended,
                KernelMode,
                FALSE,
                NULL
            );

            Status = IoStatus.Status;
        }

    } _SEH2_FINALLY {

        if (Event) {
            Ext2FreePool(Event, 'EK2E');
            DEC_MEM_COUNT(PS_DISK_EVENT, Event, sizeof(KEVENT));
        }
    } _SEH2_END;

    return Status;
}

Referenced by Ext2ReadDisk().

Ext2ReadWriteBlockAsyncCompletionRoutine()

NTSTATUS NTAPI Ext2ReadWriteBlockAsyncCompletionRoutine	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp,
		IN PVOID	Context
	)

Definition at line 185 of file block.c.

{
    PEXT2_RW_CONTEXT pContext = (PEXT2_RW_CONTEXT)Context;
    PIO_STACK_LOCATION iosp;

    ASSERT(FALSE == pContext->Wait);

    if (Irp != pContext->MasterIrp && !NT_SUCCESS(Irp->IoStatus.Status)) {
        pContext->MasterIrp->IoStatus = Irp->IoStatus;
    }

    if (InterlockedDecrement(&pContext->Blocks) == 0) {

        if (NT_SUCCESS(pContext->MasterIrp->IoStatus.Status)) {

            /* set written bytes to status information */
            pContext->MasterIrp->IoStatus.Information = pContext->Length;

            if (pContext->FileObject != NULL && !IsFlagOn(pContext->MasterIrp->Flags, IRP_PAGING_IO)) {

                /* modify FileObject flags, skip this for volume direct access */
                SetFlag( pContext->FileObject->Flags,
                         IsFlagOn(pContext->Flags, EXT2_RW_CONTEXT_WRITE) ?
                         FO_FILE_MODIFIED : FO_FILE_FAST_IO_READ);

                /* update Current Byteoffset */
                if (IsFlagOn(pContext->FileObject->Flags, FO_SYNCHRONOUS_IO)) {
                    iosp = IoGetCurrentIrpStackLocation(pContext->MasterIrp);
                    pContext->FileObject->CurrentByteOffset.QuadPart =
                        iosp->Parameters.Read.ByteOffset.QuadPart +  pContext->Length;
                }
            }

        } else {

            pContext->MasterIrp->IoStatus.Information = 0;
        }

        /* release the locked resource acquired by the caller */
        if (pContext->Resource) {
            ExReleaseResourceForThread(pContext->Resource, pContext->ThreadId);
        }

        Ext2FreePool(pContext, EXT2_RWC_MAGIC);
        DEC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
    }

    return STATUS_SUCCESS;
}

Referenced by Ext2ReadWriteBlocks().

Ext2ReadWriteBlocks()

NTSTATUS Ext2ReadWriteBlocks	(	IN PEXT2_IRP_CONTEXT	IrpContext,
		IN PEXT2_VCB	Vcb,
		IN PEXT2_EXTENT	Chain,
		IN ULONG	Length
	)

Definition at line 240 of file block.c.

{
    PIRP                Irp;
    PIRP                MasterIrp = IrpContext->Irp;
    PIO_STACK_LOCATION  IrpSp;
    PMDL                Mdl;
    PEXT2_RW_CONTEXT    pContext = NULL;
    PEXT2_EXTENT        Extent;
    KEVENT              Wait;
    NTSTATUS            Status = STATUS_SUCCESS;
    BOOLEAN             bMasterCompleted = FALSE;
    BOOLEAN             bBugCheck = FALSE;

    ASSERT(MasterIrp);

    _SEH2_TRY {

        pContext = Ext2AllocatePool(NonPagedPool, sizeof(EXT2_RW_CONTEXT), EXT2_RWC_MAGIC);

        if (!pContext) {
            DEBUG(DL_ERR, ( "Ex2ReadWriteBlocks: failed to allocate pContext.\n"));
            Status = STATUS_INSUFFICIENT_RESOURCES;
            _SEH2_LEAVE;
        }

        INC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
        RtlZeroMemory(pContext, sizeof(EXT2_RW_CONTEXT));
        pContext->Wait = Ext2CanIWait();
        pContext->MasterIrp = MasterIrp;
        pContext->Length = Length;

        if (IrpContext->MajorFunction == IRP_MJ_WRITE) {
            SetFlag(pContext->Flags, EXT2_RW_CONTEXT_WRITE);
        }

        if (pContext->Wait) {

            KeInitializeEvent(&(pContext->Event), NotificationEvent, FALSE);

        } else if (IrpContext->Fcb->Identifier.Type == EXT2FCB) {

            if (IsFlagOn(MasterIrp->Flags, IRP_PAGING_IO)) {
                pContext->Resource = &IrpContext->Fcb->PagingIoResource;
            } else {
                pContext->Resource = &IrpContext->Fcb->MainResource;
            }

            pContext->FileObject = IrpContext->FileObject;
            pContext->ThreadId = ExGetCurrentResourceThread();
        }


        if (NULL == Chain->Next && 0 == Chain->Offset) {

            /* we get only 1 extent to dispatch, then don't bother allocating new irps */

            /* setup the Stack location to do a read from the disk driver. */
            IrpSp = IoGetNextIrpStackLocation(MasterIrp);
            IrpSp->MajorFunction = IrpContext->MajorFunction;
            IrpSp->Parameters.Read.Length = Chain->Length;
            IrpSp->Parameters.Read.ByteOffset.QuadPart = Chain->Lba;
            if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
                SetFlag(IrpSp->Flags, SL_WRITE_THROUGH);
            }
            if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ)) {
                SetFlag(IrpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME);
            }

            IoSetCompletionRoutine(
                    MasterIrp,
                    Ext2CanIWait() ?
                    Ext2ReadWriteBlockSyncCompletionRoutine :
                    Ext2ReadWriteBlockAsyncCompletionRoutine,
                    (PVOID) pContext,
                    TRUE,
                    TRUE,
                    TRUE );

            /* intialize context block */
            Chain->Irp = MasterIrp;
            pContext->Blocks = 1;

        } else {

            for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {

                Irp = IoMakeAssociatedIrp(
                          MasterIrp,
                          (CCHAR)(Vcb->TargetDeviceObject->StackSize + 1) );

                if (!Irp) {
                    Status = STATUS_INSUFFICIENT_RESOURCES;
                    _SEH2_LEAVE;
                }

                Mdl = IoAllocateMdl( (PCHAR)MasterIrp->UserBuffer +
                                     Extent->Offset,
                                     Extent->Length,
                                     FALSE,
                                     FALSE,
                                     Irp );

                if (!Mdl)  {
                    Status = STATUS_INSUFFICIENT_RESOURCES;
                    _SEH2_LEAVE;
                }

                IoBuildPartialMdl( MasterIrp->MdlAddress,
                                   Mdl,
                                   (PCHAR)MasterIrp->UserBuffer+Extent->Offset,
                                   Extent->Length );

                IoSetNextIrpStackLocation(Irp);
                IrpSp = IoGetCurrentIrpStackLocation(Irp);

                IrpSp->MajorFunction = IrpContext->MajorFunction;
                IrpSp->Parameters.Read.Length = Extent->Length;
                IrpSp->Parameters.Read.ByteOffset.QuadPart = Extent->Lba;

                IoSetCompletionRoutine(
                    Irp,
                    Ext2CanIWait() ?
                    Ext2ReadWriteBlockSyncCompletionRoutine :
                    Ext2ReadWriteBlockAsyncCompletionRoutine,
                    (PVOID) pContext,
                    TRUE,
                    TRUE,
                    TRUE );

                IrpSp = IoGetNextIrpStackLocation(Irp);

                IrpSp->MajorFunction = IrpContext->MajorFunction;
                IrpSp->Parameters.Read.Length =Extent->Length;
                IrpSp->Parameters.Read.ByteOffset.QuadPart = Extent->Lba;

                /* set write through flag */
                if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
                    SetFlag( IrpSp->Flags, SL_WRITE_THROUGH );
                }

                /* set verify flag */
                if (IsFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ)) {
                    SetFlag(IrpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME);
                }

                Extent->Irp = Irp;
                pContext->Blocks += 1;
            }

            MasterIrp->AssociatedIrp.IrpCount = pContext->Blocks;
            if (Ext2CanIWait()) {
                MasterIrp->AssociatedIrp.IrpCount += 1;
            }
        }
        if (!Ext2CanIWait()) {
            /* mark MasterIrp pending */
            IoMarkIrpPending(pContext->MasterIrp);
        }

        bBugCheck = TRUE;

        for (Extent = Chain; Extent != NULL; Extent = Extent->Next) {
            Status = IoCallDriver ( Vcb->TargetDeviceObject,
                                    Extent->Irp);
            Extent->Irp = NULL;
        }

        if (Ext2CanIWait()) {
            KeWaitForSingleObject( &(pContext->Event),
                                   Executive, KernelMode, FALSE, NULL );
            KeClearEvent( &(pContext->Event) );
        } else {
            bMasterCompleted = TRUE;
        }

    } _SEH2_FINALLY {

        for (Extent = Chain; Extent != NULL; Extent = Extent->Next)  {
            if (Extent->Irp != NULL ) {
                if (Extent->Irp->MdlAddress != NULL) {
                    IoFreeMdl(Extent->Irp->MdlAddress );
                }
                IoFreeIrp(Extent->Irp);
            }
        }

        if (IrpContext->ExceptionInProgress) {

            if (bBugCheck) {
                Ext2BugCheck(EXT2_BUGCHK_BLOCK, 0, 0, 0);
            }

        } else {

            if (Ext2CanIWait()) {
                if (MasterIrp) {
                    Status = MasterIrp->IoStatus.Status;
                }
                if (pContext) {
                    Ext2FreePool(pContext, EXT2_RWC_MAGIC);
                    DEC_MEM_COUNT(PS_RW_CONTEXT, pContext, sizeof(EXT2_RW_CONTEXT));
                }
            } else {
                if (bMasterCompleted) {
                    IrpContext->Irp = NULL;
                    Status = STATUS_PENDING;
                }
            }
        }
    } _SEH2_END;

    return Status;
}

Referenced by Ext2ReadInode(), Ext2ReadVolume(), Ext2WriteInode(), and Ext2WriteVolume().

Ext2ReadWriteBlockSyncCompletionRoutine()

NTSTATUS NTAPI Ext2ReadWriteBlockSyncCompletionRoutine	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp,
		IN PVOID	Context
	)

Definition at line 152 of file block.c.

{
    PEXT2_RW_CONTEXT pContext = (PEXT2_RW_CONTEXT)Context;

    if (Irp != pContext->MasterIrp) {

        if (!NT_SUCCESS(Irp->IoStatus.Status)) {
            pContext->MasterIrp->IoStatus = Irp->IoStatus;
        }

        IoFreeMdl(Irp->MdlAddress);
        IoFreeIrp(Irp );
    }

    if (InterlockedDecrement(&pContext->Blocks) == 0) {

        pContext->MasterIrp->IoStatus.Information = 0;
        if (NT_SUCCESS(pContext->MasterIrp->IoStatus.Status)) {

            pContext->MasterIrp->IoStatus.Information =
                pContext->Length;
        }

        KeSetEvent(&pContext->Event, 0, FALSE);
    }

    return STATUS_MORE_PROCESSING_REQUIRED;
}

Referenced by Ext2ReadWriteBlocks().

Variable Documentation

Ext2Global

PEXT2_GLOBAL Ext2Global

Definition at line 16 of file init.c.