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ubc_fault: check UVM_OBJ_NEEDS_WRITEFAULT.

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fix an assertion failure in genfs_putpages when using msdosfs.
(http://mail-index.NetBSD.org/tech-kern/2006/09/27/0002.html)
reported and tested by Darrin B.Jewell.
This commit is contained in:
yamt 2006-09-30 15:37:22 +00:00
parent 213f273e6a
commit 7e1b20a4cf
1 changed files with 6 additions and 4 deletions
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10
sys/uvm/uvm_bio.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_bio.c,v 1.48 2006/09/03 21:33:33 christos Exp $ */
/* $NetBSD: uvm_bio.c,v 1.49 2006/09/30 15:37:22 yamt Exp $ */
/*
* Copyright (c) 1998 Chuck Silvers.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.48 2006/09/03 21:33:33 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.49 2006/09/30 15:37:22 yamt Exp $");
#include "opt_uvmhist.h"
@ -42,6 +42,7 @@ __KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.48 2006/09/03 21:33:33 christos Exp $"
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <uvm/uvm.h>
@ -356,8 +357,9 @@ again:
* is marked as PG_RDONLY.
*/
rdonly = (access_type & VM_PROT_WRITE) == 0 &&
(pg->flags & PG_RDONLY) != 0;
rdonly = ((access_type & VM_PROT_WRITE) == 0 &&
(pg->flags & PG_RDONLY) != 0) ||
UVM_OBJ_NEEDS_WRITEFAULT(uobj);
KASSERT((pg->flags & PG_RDONLY) == 0 ||
(access_type & VM_PROT_WRITE) == 0 ||
pg->offset < umap->writeoff ||