From 1d3a1e16a9c6522839f64e16d213c6afef1a5d35 Mon Sep 17 00:00:00 2001
From: dillon <dillon@FreeBSD.org>
Date: Sun, 24 Jan 1999 01:06:31 +0000
Subject: [PATCH]     It is possible for a page in the cache to be busy. 
 vm_pageout.c was not     checking for this condition while it tried to free
 cache pages.  Fixed.

---
 sys/vm/vm_pageout.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index b5f4f470afdb..29b46111f2bd 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -65,7 +65,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- * $Id: vm_pageout.c,v 1.130 1999/01/21 08:29:12 dillon Exp $
+ * $Id: vm_pageout.c,v 1.131 1999/01/21 10:12:54 dillon Exp $
  */
 
 /*
@@ -1082,6 +1082,10 @@ vm_pageout_scan()
 		m = vm_page_list_find(PQ_CACHE, cache_rover);
 		if (!m)
 			break;
+		if ((m->flags & PG_BUSY) || m->busy || m->hold_count || m->wire_count) {
+			vm_page_deactivate(m);
+			continue;
+		}
 		cache_rover = (cache_rover + PQ_PRIME2) & PQ_L2_MASK;
 		vm_pageout_page_free(m);
 		cnt.v_dfree++;