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Al Viro authored
it's enough to set ->mnt_ns of internal vfsmounts to something distinct from all struct mnt_namespace out there; then we can just use the check for ->mnt_ns != NULL in the fast path of mntput_no_expire() Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> (cherry picked from commit f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e)
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