[src/yamt-pagecache]: src/sys/miscfs/genfs fix overwrite case

[yamt <yamt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c6cd19802cbf
branches:  yamt-pagecache
changeset: 770861:c6cd19802cbf
user:      yamt <yamt%NetBSD.org@localhost>
date:      Sat Jan 14 04:44:45 2012 +0000

description:
fix overwrite case

diffstat:

 sys/miscfs/genfs/genfs_io.c |  10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diffs (33 lines):

diff -r 4d8568090699 -r c6cd19802cbf sys/miscfs/genfs/genfs_io.c
--- a/sys/miscfs/genfs/genfs_io.c       Sat Jan 14 04:36:39 2012 +0000
+++ b/sys/miscfs/genfs/genfs_io.c       Sat Jan 14 04:44:45 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: genfs_io.c,v 1.53.2.6 2011/12/20 13:46:17 yamt Exp $   */
+/*     $NetBSD: genfs_io.c,v 1.53.2.7 2012/01/14 04:44:45 yamt Exp $   */
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: genfs_io.c,v 1.53.2.6 2011/12/20 13:46:17 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: genfs_io.c,v 1.53.2.7 2012/01/14 04:44:45 yamt Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -370,12 +370,10 @@
                        struct vm_page *pg = pgs[ridx + i];
 
                        /*
-                        * we should not see PG_HOLE pages here as it's a
-                        * caller's responsibility to allocate blocks
+                        * it's caller's responsibility to allocate blocks
                         * beforehand for the overwrite case.
                         */
-                       KASSERT((pg->flags & PG_HOLE) == 0);
-                       pg->flags &= ~PG_RDONLY;
+                       pg->flags &= ~(PG_RDONLY|PG_HOLE);
                        /*
                         * mark the page dirty.
                         * otherwise another thread can do putpages and pull