if we don't mark bmap as tobe free, new leases will be added to the bmap between it is added to to_free and it is actually freed, causing leaks.
if we don't mark bmap as tobe free, new leases will be added to the bmap
between it is added to to_free and it is actually freed, causing leaks.

zhihui@lemon: ~/projects-lemon/slash2/slictl$ ./slictl -p pool.bmaprls.total
parameter                                value
================================================================================
pool.bmaprls.total                       92350

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable