linux-kernel - Re: [RFC][PATCH 0/9] VFS: Introduce mount context

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Message-ID: <31716.1493830216@warthog.procyon.org.uk>
Date:   Wed, 03 May 2017 17:50:16 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jeff Layton <jlayton@...chiereds.net>
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, mszeredi@...hat.com
Subject: Re: [RFC][PATCH 0/9] VFS: Introduce mount context

Jeff Layton <jlayton@...chiereds.net> wrote:

> >  (*) Move the walk-from-root stuff that nfs has to generic code so that you
> >      can do something akin to:
> > 
> > 	mount /dev/sda1:/foo/bar /mnt
> > 
> >      See nfs_follow_remote_path() and mount_subtree().  This is slightly
> >      tricky in NFS as we have to prevent referral loops.
> > 
> 
> ':' is a legitimate character in a path component. How will you
> distinguish that case?

Fair point.  Could instead do something like:

	mount /dev/sda1 /mnt -o subroot=/foo/bar

or just limit it to the fsopen interface.

David