From mboxrd@z Thu Jan  1 00:00:00 1970
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From: "J. R. Okajima" <hooanon05g@gmail.com>
Subject: Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Djalal Harouni <tixxdz@gmail.com>, Chris Mason <clm@fb.com>,
        Theodore Tso <tytso@mit.edu>,
        Josh Triplett <josh@joshtriplett.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andy Lutomirski <luto@kernel.org>,
        Seth Forshee <seth.forshee@canonical.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-security-module@vger.kernel.org,
        Dongsu Park <dongsu@endocode.com>,
        David Herrmann <dh.herrmann@googlemail.com>,
        Miklos Szeredi <mszeredi@redhat.com>,
        Alban Crequy <alban.crequy@gmail.com>,
        Al Viro <viro@ZenIV.linux.org.uk>,
        "Serge E. Hallyn" <serge@hallyn.com>, Phil Estes <estesp@gmail.com>
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Date: Tue, 21 Feb 2017 13:34:22 +0900
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James Bottomley:
> With a different owner view, but that's irrelevant to the underlying
> inode.

Ok, the different ownership is limited within shitfs (or userns,
container). Good. I might forget that shiftfs wants to behave like
bind-mount.

And I noticed that shiftfs setattr() converts uid/gid before calling
backend fs' ->setattr(). It is good too.
But how about acl? Won't such conversion be necessary for acl too?


J. R. Okajima