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block: create 'slaves' and 'holders' entries for hidden gendisks
When creating nvme multipath devices we should populate the 'slaves' and 'holders' directorys properly to aid userspace topology detection. Signed-off-by: Hannes Reinecke <[email protected]> [hch: split from a larger patch] Reviewed-by: Keith Busch <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Jens Axboe <[email protected]>