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Until now, NVMe disks were handled by zipl as SCSI disks. To support NVMe stand-alone dump, it became necessary to further differentiate between both types of disks. There are two cases that must be handled: 1. A non-device-mapper device is a NVMe disk if it is assigned to the blkext device driver. 2. A device-mapper disk is a NVMe disk if the ioctl NVME_IOCTL_ID succeeds. This case is necessary to properly recognize NVMe disks which are DM devices and, therefore, not directly handled by the blkext device driver. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Stefan Haberland <sth@linux.ibm.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>