svn commit: r184934 - head/sys/ufs/ffs

[Doug Ambrisko]

Author: ambrisko
Date: Thu Nov 13 17:40:21 2008
New Revision: 184934
URL: http://svn.freebsd.org/changeset/base/184934

Log:
  For now on every 10 cyclinder groups flush the buffer cache to free
  up space.  If the buffer cache fills up then the disk systems can
  grind to a halt.  Better tuning can be figured out later.
  
  Tested by:	Tim, others and work
  Reviewed by:	Kostik Belousov
  PR:		128832

Modified:
  head/sys/ufs/ffs/ffs_snapshot.c

Modified: head/sys/ufs/ffs/ffs_snapshot.c
==============================================================================
--- head/sys/ufs/ffs/ffs_snapshot.c	Thu Nov 13 17:13:16 2008	(r184933)
+++ head/sys/ufs/ffs/ffs_snapshot.c	Thu Nov 13 17:40:21 2008	(r184934)
@@ -351,6 +351,8 @@ restart:
 		if (error)
 			goto out;
 		bawrite(nbp);
+		if (cg % 10 == 0)
+			ffs_syncvnode(vp, MNT_WAIT);
 	}
 	/*
 	 * Copy all the cylinder group maps. Although the
@@ -372,6 +374,8 @@ restart:
 			goto out;
 		error = cgaccount(cg, vp, nbp, 1);
 		bawrite(nbp);
+		if (cg % 10 == 0)
+			ffs_syncvnode(vp, MNT_WAIT);
 		if (error)
 			goto out;
 	}