9c0fad5fb5f47da125bb768dbb4cd0e824cccc7c
One of the things that mkdir_userns{,_p}() does is take an (optional) UID,
and chown the directory to that. So we need a uid_t argument, and a way of
telling if we should use that uid_t argument. Fortunately, that is built
in to the uid_t type by having UID_INVALID as a possible value.
However, currently mkdir_userns() also takes a MountSettingsMask and checks
a couple of bits in it to decide if it should perform the chown.
Drop the mask argument, and instead have the caller pass UID_INVALID if it
shouldn't chown.
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