Damien,

This patch series implements a cached report zones using information
from the block layer zone write plugs and a new zone condition
tracking. This avoids having to execute slow report zones commands on
the device when for instance mounting file systems, which can
significantly speed things up, especially in setups with multiple SMR
HDDs (e.g. a BTRFS RAID volume).

Looks good to me.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
Martin K. Petersen