APPLIED: [PATCH v1 0/4][DISCO] fs: add shiftfs

[Seth Forshee]

On Thu, Apr 04, 2019 at 03:39:10PM +0200, Christian Brauner wrote:
> Hey everyone,
> 
> This is v1 of shiftfs with Tyler's comments addressed.
> 
> This is the patchset for shiftfs which Seth and I have been working on
> for a while. It is needed to transparently translate the on-disk ids of
> an underlaying filesystem into valid ids in a given user namespace.
> This work has been mentioned quite a bit lately since we need it for LXD
> and Anbox and has been 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.
> Also, a big thank you to Seth who even with his regular busy schedule
> still always was ready to help out by discussing ideas, reviewing, and
> writing patches.

Applied to disco/master-next, thanks!