Bryan Drewery 15719ec499 Follow-up r295924: Only sync hash-based db files open for writing when closing.
This fixes a major performance regression when reading db files such as
the pw database during a 'pkg install'.

MFC after:	1 week
Tested by:	bapt
Reviewed by:	bapt
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D5868
2016-04-06 22:38:50 +00:00
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