Hi all, a while ago Thadeu reported installer problems because nvme multipath didn't provide slaves/holders links for the underlying devices. This is because for one Tejun said the API shall not be used for new users, but also because it currently hangs off the block_device structure, which has a too short lifetime. This series ignores Tejuns advice given that these links are the defacto API for stacked block devices, moves the tracking to struct hd_struct, and makes it work on NVMe multipath.
