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由 Al Viro 提交于
new flag: LOOKUP_DOWN. If the starting point is overmounted, cross into whatever's mounted on top, triggering referrals et.al. Use that instead of follow_down_one() loop in mntns_install(), handle errors properly. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
4f757f3c