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Access to original contents of mount point

I have a directory d containing some file f and I mount a drive on directory d. Is there a way of accessing file f without unmounting?

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marked as duplicate by Gilles, jasonwryan, Renan, daisy, Mat Sep 29 '12 at 8:04

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Yes, bind the original fs to a different position, and you can access it:

mount --bind "$(df -P d | awk '/\/dev/ {print $1}')" /tmp/oldroot

And files would be accessible through /tmp/oldroot/XX/f

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Nice trick! I would have expected the answer: “No, it's shadowed by the other file system unless you unmount it.” – Marco Sep 28 '12 at 9:20
    
@Marco: The directory in the original mount is shadowed, but bind mounting the device itself somewhere else makes everything on it available elsewhere. – Ignacio Vazquez-Abrams Sep 28 '12 at 15:18
    
This does not appear to work on redhat/centOS 7. It works on 6.x. In 7 it will just show the mounted dir. – MikeKulls Feb 1 '16 at 0:50

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