Function Ext2WriteVolume

Ext4Fsd/write.c:219–649

NTSTATUS
Ext2WriteVolume (IN PEXT2_IRP_CONTEXT IrpContext)
{
    NTSTATUS            Status = STATUS_UNSUCCESSFUL;

    PEXT2_VCB           Vcb = NULL;
    PEXT2_CCB           Ccb = NULL;
    PEXT2_FCBVCB        FcbOrVcb = NULL;
    PFILE_OBJECT        FileObject = NULL;

    PDEVICE_OBJECT      DeviceObject = NULL;

    PIRP                Irp = NULL;
    PIO_STACK_LOCATION  IoStackLocation = NULL;

    ULONG               Length;
    LARGE_INTEGER       ByteOffset;

    BOOLEAN             PagingIo = FALSE;
    BOOLEAN             Nocache = FALSE;
    BOOLEAN             SynchronousIo = FALSE;
    BOOLEAN             MainResourceAcquired = FALSE;

    BOOLEAN             bDeferred = FALSE;

    PUCHAR              Buffer = NULL;
    PEXT2_EXTENT        Chain = NULL;
    EXT2_EXTENT         BlockArray;

    __try {

        ASSERT(IrpContext);
        ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
               (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));

        DeviceObject = IrpContext->DeviceObject;
        Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
        ASSERT(Vcb != NULL);
        ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
               (Vcb->Identifier.Size == sizeof(EXT2_VCB)));

        FileObject = IrpContext->FileObject;
        FcbOrVcb = (PEXT2_FCBVCB) FileObject->FsContext;
        ASSERT(FcbOrVcb);

        if (!(FcbOrVcb->Identifier.Type == EXT2VCB && (PVOID)FcbOrVcb == (PVOID)Vcb)) {
            Status = STATUS_INVALID_DEVICE_REQUEST;
            __leave;
        }

        Ccb = (PEXT2_CCB) FileObject->FsContext2;
        Irp = IrpContext->Irp;
        IoStackLocation = IoGetCurrentIrpStackLocation(Irp);

        Length = IoStackLocation->Parameters.Write.Length;
        ByteOffset = IoStackLocation->Parameters.Write.ByteOffset;

        PagingIo = IsFlagOn(Irp->Flags, IRP_PAGING_IO);