Author: kib
Date: Mon Jul 28 14:20:31 2014
New Revision: 269187
URL: http://svnweb.freebsd.org/changeset/base/269187
Log:
Assert that nullfs vnode has VV_ROOT set whenever lower vnode has.
Assert that dotdot lookup on the root vnode is not performed.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/fs/nullfs/null_vnops.c
Modified: head/sys/fs/nullfs/null_vnops.c
==============================================================================
--- head/sys/fs/nullfs/null_vnops.c Mon Jul 28 14:15:41 2014
(r269186)
+++ head/sys/fs/nullfs/null_vnops.c Mon Jul 28 14:20:31 2014
(r269187)
@@ -372,6 +372,10 @@ null_lookup(struct vop_lookup_args *ap)
*/
ldvp = NULLVPTOLOWERVP(dvp);
vp = lvp = NULL;
+ KASSERT((ldvp->v_vflag & VV_ROOT) == 0 ||
+ ((dvp->v_vflag & VV_ROOT) != 0 && (flags & ISDOTDOT) == 0),
+ ("ldvp %p fl %#x dvp %p fl %#x flags %#x", ldvp, ldvp->v_vflag,
+ dvp, dvp->v_vflag, flags));
error = VOP_LOOKUP(ldvp, &lvp, cnp);
if (error == EJUSTRETURN && (flags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
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