Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
sys/ufs/ffs/ffs_snapshot.c
View File

@ -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. * Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
@ -38,7 +38,7 @@
*/ */
#include <sys/cdefs.h> #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) #if defined(_KERNEL_OPT)
#include "opt_ffs.h" #include "opt_ffs.h"
@ -423,11 +423,11 @@ snapshot_setup(struct mount *mp, struct vnode *vp)
struct inode *ip = VTOI(vp); struct inode *ip = VTOI(vp);
/* /*
* Check mount, exclusive reference and owner. * Check mount, readonly reference and owner.
*/ */
if (vp->v_mount != mp) if (vp->v_mount != mp)
return EXDEV; return EXDEV;
if (vp->v_usecount != 1 || vp->v_writecount != 0) if (vp->v_writecount != 0)
return EBUSY; return EBUSY;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_SNAPSHOT, error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_SNAPSHOT,
0, mp, vp, NULL); 0, mp, vp, NULL);