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Add MNTK_LOOKUP_EXCL_DOTDOT struct mount flag, which specifies to the
lookup code that dotdot lookups shall override any shared lock requests with the exclusive one. The flag is useful for filesystems which sometimes need to upgrade shared lock to exclusive inside the VOP_LOOKUP or later, which cannot be done safely for dotdot, due to dvp also locked and causing LOR. In collaboration with: pho MFC after: 3 weeks git-svn-id: svn+ssh://svn.freebsd.org/base/head@240283 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
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