vfs: introduce clone_private_mount()
Overlayfs needs a private clone of the mount, so create a function for
this and export to modules.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
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Overlayfs needs a private clone of the mount, so create a function for
this and export to modules.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>