APPLIED[Unstable]: [SRU][UNSTABLE][PATCH] UBUNTU: SAUCE: shiftfs: record correct creator credentials

[Seth Forshee]

On Fri, Apr 10, 2020 at 04:55:28PM +0200, Christian Brauner wrote:
> From: Christian Brauner <christian.brauner at ubuntu.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1872094
> 
> When shiftfs is nested we failed to be able to create any files or
> access directories because we recorded the wrong creator credentials. We
> need to record the credentials of the creator of the lowers mark mount
> of shiftfs. Otherwise we aren't privileged wrt to the shiftfs layer in
> the nesting case. This is similar to how we always record the user
> namespace of the base filesystem.
> 
> Suggested-by: Seth Forshee <seth.forshee at canonical.com>
> Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>

Applied to unstable/master, thanks!