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vclean: be paranoid and set v_tag, v_op while holding v_interlock. 

FS code could check their values while scrolling through mnt_vnodelist.
This commit is contained in:
ad 2008-12-14 11:15:59 +00:00
parent 31420e7959
commit 024c36f64b
1 changed files with 3 additions and 3 deletions
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6
sys/kern/vfs_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_subr.c,v 1.359 2008/12/14 11:13:36 ad Exp $ */
/* $NetBSD: vfs_subr.c,v 1.360 2008/12/14 11:15:59 ad Exp $ */
/*-
* Copyright (c) 1997, 1998, 2004, 2005, 2007, 2008 The NetBSD Foundation, Inc.
@ -81,7 +81,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.359 2008/12/14 11:13:36 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.360 2008/12/14 11:15:59 ad Exp $");
#include "opt_ddb.h"
#include "opt_compat_netbsd.h"
@ -1841,9 +1841,9 @@ vclean(vnode_t *vp, int flags)
cache_purge(vp);
/* Done with purge, notify sleepers of the grim news. */
mutex_enter(&vp->v_interlock);
vp->v_op = dead_vnodeop_p;
vp->v_tag = VT_NON;
mutex_enter(&vp->v_interlock);
vp->v_vnlock = &vp->v_lock;
KNOTE(&vp->v_klist, NOTE_REVOKE);
vp->v_iflag &= ~(VI_XLOCK | VI_FREEING);