Always request exclusive lock for the lower vnode in nullfs_vget().
The null_nodeget() requires exclusive lock on lowervp to be able to
insmntque() new vnode.
Reported by: rea
Tested by: pho
MFC after: 1 week
Always request exclusive lock for the lower vnode in nullfs_vget(). rS232301Unpublished Tags None Referenced Files None Subscribers None
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