mckusick 940856bc57 Avoid reading a snapshot block when it is already in the cache.
Update the use of the B_CACHE flag (since the May 1999 commit
that made it the correct test here).

Reported by: Andreas Longwitz <longwitz@incore.de>
Reviewed by: kib
Tested by: Peter Holm
MFC after: 1 week
2017-07-31 20:41:45 +00:00
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