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Set mddev queue's max_write_same_sectors to its chunk_sector value (before disk_stack_limits merges the underlying disk limits.) With that in place, be sure to handle writes coming down from the block layer that have the REQ_WRITE_SAME flag set. That flag needs to be copied into any newly cloned write bio. Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com> Acked-by: "Martin K. Petersen" <martin.petersen@oracle.com> Signed-off-by: NeilBrown <neilb@suse.de>