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Date: Fri, 15 Jun 2018 08:25:29 -0700
From: Matthew Wilcox <willy@infradead.org>
To: Seth Forshee <seth.forshee@canonical.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
        James Bottomley <James.Bottomley@HansenPartnership.com>,
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        Christian Brauner <christian.brauner@canonical.com>
Subject: Re: shiftfs status and future development
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On Fri, Jun 15, 2018 at 09:59:17AM -0500, Seth Forshee wrote:
>  - Supports any id maps possible for a user namespace

Have we already ruled out storing the container's UID/GID/perms in an
extended attribute, and having all the files owned by the owner of the
container from the perspective of the unshifted fs.  Then shiftfs reads
the xattr and presents the files with the container's idea of what the
UID is?