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Testing "v_usecount == 1" for exclusive reference will not always 

work -- remove and test only readonly.
This commit is contained in:
hannken 2014-05-30 08:40:09 +00:00
parent ba7dc1f3c8
commit 7bd94e9e7c
1 changed files with 4 additions and 4 deletions
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8
sys/ufs/ffs/ffs_snapshot.c
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@ -1,4 +1,4 @@
/* $NetBSD: ffs_snapshot.c,v 1.134 2014/05/24 16:34:04 christos Exp $ */
/* $NetBSD: ffs_snapshot.c,v 1.135 2014/05/30 08:40:09 hannken Exp $ */
/*
* Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.c,v 1.134 2014/05/24 16:34:04 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.c,v 1.135 2014/05/30 08:40:09 hannken Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
@ -423,11 +423,11 @@ snapshot_setup(struct mount *mp, struct vnode *vp)
struct inode *ip = VTOI(vp);
/*
* Check mount, exclusive reference and owner.
* Check mount, readonly reference and owner.
*/
if (vp->v_mount != mp)
return EXDEV;
if (vp->v_usecount != 1 || vp->v_writecount != 0)
if (vp->v_writecount != 0)
return EBUSY;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_SNAPSHOT,
0, mp, vp, NULL);