svn commit: r185054 - in stable/7/sys: . ufs/ffs

[Doug Ambrisko]

Author: ambrisko
Date: Tue Nov 18 18:21:36 2008
New Revision: 185054
URL: http://svn.freebsd.org/changeset/base/185054

Log:
  MFC 184934:
  
  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.
  
  PR:		128832
  Approved by:	re (kensmith)

Modified:
  stable/7/sys/   (props changed)
  stable/7/sys/ufs/ffs/ffs_snapshot.c

Modified: stable/7/sys/ufs/ffs/ffs_snapshot.c
==============================================================================
--- stable/7/sys/ufs/ffs/ffs_snapshot.c	Tue Nov 18 15:48:23 2008	(r185053)
+++ stable/7/sys/ufs/ffs/ffs_snapshot.c	Tue Nov 18 18:21:36 2008	(r185054)
@@ -345,6 +345,8 @@ restart:
 		if (error)
 			goto out;
 		bawrite(nbp);
+		if (cg % 10 == 0)
+			ffs_syncvnode(vp, MNT_WAIT);
 	}
 	/*
 	 * Copy all the cylinder group maps. Although the
@@ -366,6 +368,8 @@ restart:
 			goto out;
 		error = cgaccount(cg, vp, nbp, 1);
 		bawrite(nbp);
+		if (cg % 10 == 0)
+			ffs_syncvnode(vp, MNT_WAIT);
 		if (error)
 			goto out;
 	}