svn commit: r242921 - stable/9/sys/kern

[Konstantin Belousov]

Author: kib
Date: Mon Nov 12 15:17:25 2012
New Revision: 242921
URL: http://svnweb.freebsd.org/changeset/base/242921

Log:
  MFC r242617:
  A clarification to the behaviour of the active vnode list management
  regarding the vnode page cleaning.

Modified:
  stable/9/sys/kern/vfs_subr.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/vfs_subr.c
==============================================================================
--- stable/9/sys/kern/vfs_subr.c	Mon Nov 12 14:34:46 2012	(r242920)
+++ stable/9/sys/kern/vfs_subr.c	Mon Nov 12 15:17:25 2012	(r242921)
@@ -2547,6 +2547,9 @@ vinactive(struct vnode *vp, struct threa
 	 * Before moving off the active list, we must be sure that any
 	 * modified pages are on the vnode's dirty list since these will
 	 * no longer be checked once the vnode is on the inactive list.
+	 * Because the vnode vm object keeps a hold reference on the vnode
+	 * if there is at least one resident non-cached page, the vnode
+	 * cannot leave the active list without the page cleanup done.
 	 */
 	obj = vp->v_object;
 	if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0) {