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As result, we lock the devvp vnode around calls to VOP_FSYNC() on unmount. For instance, the vn_fsync_buf() implementation of fsync() needs exclusive lock on the vnode to guarantee that all dirty buffers are indeed synced. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D59932