vfs: Allow userns root to call mknod on owned filesystems.
These filesystems already always set SB_I_NODEV so mknod will not be useful for gaining control of any devices no matter their permissions. This will allow overlayfs and applications like to fakeroot to use device nodes to represent things on disk. Acked-by: Seth Forshee <email@example.com> Signed-off-by: "Eric W. Biederman" <firstname.lastname@example.org>
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