K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2018-05-06T00:03:24.088566Z
K 7
svn:log
V 446
Avoid dropping the topology lock in gmirror's dumpconf implementation.

Doing so introduces races which can lead to a use-after-free when
grabbing a snapshot of the GEOM mesh.

To ensure that a mirror's disk list remains stable, change its locking
protocol: both the softc lock and the topology lock are now required
to modify the list, so either lock is sufficient for traversal.

Tested by:	pho
MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon

END