Parse the tmpfs mode before validating.
Parse the tmpfs mode before validating.

This gets rid of the problematic modeRegex.

PiperOrigin-RevId: 221835959
Change-Id: I566b8d8a43579a4c30c0a08a620a964bbcd826dd

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor