** Tags added: cscc

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https://bugs.launchpad.net/bugs/1823186

Title:
  Add uid shifting overlay filesystem (shiftfs)

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  shiftfs transparently translates the on-disk ids of an underlaying
  filesystem into valid ids in a given user namespace. This is wanted in
  Ubuntu for LXD and Anbox and is targeted for inclusion in Disco.

  The main advantage of shiftfs is that it provides signficiant
  performance benefits as it lets us avoid recursively chowning the root
  filesystem for unprivileged containers when they are created or when
  their idmap is changed. This becomes very important with workloads
  where we are running a huge number of containers which Anbox and LXD
  both are currently doing. Other container runtimes will benefit from
  shiftfs in Ubuntu as well.

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