Re: [PATCH 1/2] block: move holder tracking from struct block_device to hd_struct

Reviewed-by: Sagi Grimberg

[PATCH 1/2] block: move holder tracking from struct block_device to hd_struct

We'd like to track the slaves and holder for nvme multipath devices in the same standard fashion as all the other stacked block devices to make the life for things like distro installers easy. But struct block_device only exists while we have open instances, which we never have for the underlying