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Don't drain a vnode's lock when we are cleaning it out. It still

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might be used by upper layers in the vnode stack due to exported
lock pointers.  This introduces no difference to the normal case
and works around a problem where a lower layer vnode is cleaned
out before the upper layer due to forced unmount or revoke.  And
for cosmetics, set a vnode's lock export to NULL when it is cleaned
out.

per discussion with Bill Stouder-Studenmund on tech-kern
This commit is contained in:
pooka 2007-07-09 11:35:20 +00:00
parent 73ebbed2a1
commit 1828428de1
1 changed files with 9 additions and 6 deletions
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15
sys/kern/vfs_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_subr.c,v 1.288 2007/06/05 12:31:31 yamt Exp $ */
/* $NetBSD: vfs_subr.c,v 1.289 2007/07/09 11:35:20 pooka Exp $ */
/*-
* Copyright (c) 1997, 1998, 2004, 2005 The NetBSD Foundation, Inc.
@ -80,7 +80,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.288 2007/06/05 12:31:31 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.289 2007/07/09 11:35:20 pooka Exp $");
#include "opt_inet.h"
#include "opt_ddb.h"
@ -1522,12 +1522,14 @@ vclean(struct vnode *vp, int flags, struct lwp *l)
/*
* Even if the count is zero, the VOP_INACTIVE routine may still
* have the object locked while it cleans it out. The VOP_LOCK
* ensures that the VOP_INACTIVE routine is done with its work.
* For active vnodes, it ensures that no other activity can
* have the object locked while it cleans it out. For
* active vnodes, it ensures that no other activity can
* occur while the underlying object is being cleaned out.
*
* We don't drain the lock because it might have been exported
* to upper layers by this vnode and could still be in use.
*/
VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK);
VOP_LOCK(vp, LK_EXCLUSIVE | LK_INTERLOCK);
/*
* Clean out any cached data associated with the vnode.
@ -1649,6 +1651,7 @@ vclean(struct vnode *vp, int flags, struct lwp *l)
*/
vp->v_op = dead_vnodeop_p;
vp->v_tag = VT_NON;
vp->v_vnlock = NULL;
simple_lock(&vp->v_interlock);
VN_KNOTE(vp, NOTE_REVOKE); /* FreeBSD has this in vn_pollgone() */
vp->v_flag &= ~(VXLOCK|VLOCKSWORK);