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A union node may be reactivated while it is being reclaimed so

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change union_freevp() to detach the vnode from the union node
by clearing the vnode backpointer and the lower node sizes.
This commit is contained in:
hannken 2015-02-24 16:08:01 +00:00
parent 2947811bbb
commit 645887d187
1 changed files with 8 additions and 2 deletions
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10
sys/fs/union/union_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: union_subr.c,v 1.70 2015/02/16 10:22:00 hannken Exp $ */ /* $NetBSD: union_subr.c,v 1.71 2015/02/24 16:08:01 hannken Exp $ */
/* /*
* Copyright (c) 1994 * Copyright (c) 1994
@ -72,7 +72,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: union_subr.c,v 1.70 2015/02/16 10:22:00 hannken Exp $"); __KERNEL_RCSID(0, "$NetBSD: union_subr.c,v 1.71 2015/02/24 16:08:01 hannken Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -534,8 +534,14 @@ union_freevp(struct vnode *vp)
{ {
struct union_node *un = VTOUNION(vp); struct union_node *un = VTOUNION(vp);
/* Detach vnode from union node. */
un->un_vnode = NULL;
un->un_uppersz = VNOVAL;
un->un_lowersz = VNOVAL;
vcache_remove(vp->v_mount, &un, sizeof(un)); vcache_remove(vp->v_mount, &un, sizeof(un));
/* Detach union node from vnode. */
mutex_enter(vp->v_interlock); mutex_enter(vp->v_interlock);
vp->v_data = NULL; vp->v_data = NULL;
mutex_exit(vp->v_interlock); mutex_exit(vp->v_interlock);