Ravi Pokala bc089e5d7d [PR 206224] bv_cnt is sometimes examined without holding the bufobj lock
Add locking around access to bv_cnt which is currently being done unlocked

PR:		206224
Reviewed by:	imp
Approved by:	jhb
MFC after:	1 week
Sponsored by:	Panasas, Inc.
Differential Revision:	https://reviews.freebsd.org/D4931
2016-01-17 01:04:20 +00:00
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