Function Ext2LockUserBuffer

Ext4Fsd/block.c:100–131

}

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

    __try {

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

    } __except (EXCEPTION_EXECUTE_HANDLER) {

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

    return Status;
}

PVOID
Ext2GetUserBuffer (IN PIRP Irp )