modfs: Reports inconsistent data if filesystem unmounted#1

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hawson wants to merge 3 commits intomasterfrom issue1

+111-20

Commits on May 31, 2016

Cache mount information for 5 seconds (UPDATE_INTERVAL) before re-scanning the mount table.
hawson
committed

Commits on Jun 2, 2016

Add code to determine if a path is a mount point or not. Paths "below" the mount point
hawson
committed
Check if path is a mount point, return NaN if not mounted
hawson
committed