Josh Paetzel af131fb089 Improve ZFS exporting functionality, only export pools which are on a
specific device we happen to be writing to. This fixes an issue when
running pc-sysinstall on a running system which needs ZFS and the main
disk gets exported.

Submitted by:	kris
Obtained from:	PC-BSD
2012-03-12 21:28:54 +00:00
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