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e system - storage - improve mount/umount code to enforce simple std

Authored by raster on May 28 2020, 3:24 AM.

Description

e system - storage - improve mount/umount code to enforce simple std

all dirs owned by root - so can't be exploited. this code is not
acessible at this point so no actual issues. it still needs testing.
until other work is done it won't be tested yet.

fixes T8671 further comments on umount check.