linux-kernel - Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount

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Message-ID: <20701.1487651662@jrobl>
Date:   Tue, 21 Feb 2017 13:34:22 +0900
From:   "J. R. Okajima" <hooanon05g@...il.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     Djalal Harouni <tixxdz@...il.com>, Chris Mason <clm@...com>,
        Theodore Tso <tytso@....edu>,
        Josh Triplett <josh@...htriplett.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andy Lutomirski <luto@...nel.org>,
        Seth Forshee <seth.forshee@...onical.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Dongsu Park <dongsu@...ocode.com>,
        David Herrmann <dh.herrmann@...glemail.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Alban Crequy <alban.crequy@...il.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        "Serge E. Hallyn" <serge@...lyn.com>, Phil Estes <estesp@...il.com>
Subject: Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount

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