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Update the (shared) v_interlock if the upper node changes.

This commit is contained in:
hannken 2011-08-10 15:56:01 +00:00
parent 4f1a87cdfa
commit 3ec6312958
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 1.45 2011/08/10 06:19:54 hannken Exp $ */
/* $NetBSD: union_subr.c,v 1.46 2011/08/10 15:56:01 hannken Exp $ */
/*
* Copyright (c) 1994
@ -72,7 +72,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: union_subr.c,v 1.45 2011/08/10 06:19:54 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: union_subr.c,v 1.46 2011/08/10 15:56:01 hannken Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -223,6 +223,12 @@ union_updatevp(struct union_node *un, struct vnode *uppervp,
un->un_uppervp = uppervp;
un->un_uppersz = VNOVAL;
/* Update union vnode interlock. */
if (uppervp != NULL) {
mutex_obj_hold(uppervp->v_interlock);
uvm_obj_setlock(&UNIONTOV(un)->v_uobj,
uppervp->v_interlock);
}
}
if (docache && (ohash != nhash)) {