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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 2 Dec 2018 12:53:39 +0000 (UTC)
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Subject: svn commit: r341397 - head/sys/kern
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Author: kib
Date: Sun Dec  2 12:53:39 2018
New Revision: 341397
URL: https://svnweb.freebsd.org/changeset/base/341397

Log:
  Correct accuracy of the barrier writes accounting.
  
  Discussed with:	mckusick
  MFC after:	1 week
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/kern/vfs_bio.c

Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c	Sun Dec  2 12:51:49 2018	(r341396)
+++ head/sys/kern/vfs_bio.c	Sun Dec  2 12:53:39 2018	(r341397)
@@ -2231,7 +2231,7 @@ bufwrite(struct buf *bp)
 	}
 
 	if (bp->b_flags & B_BARRIER)
-		barrierwrites++;
+		atomic_add_long(&barrierwrites, 1);
 
 	oldflags = bp->b_flags;