To: hch@infradead.org
CC: bulb@ucw.cz, viro@parcelfarce.linux.theplanet.co.uk, hch@infradead.org,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       akpm@osdl.org
In-reply-to: <20050430083516.GC23253@infradead.org> (message from Christoph
	Hellwig on Sat, 30 Apr 2005 09:35:16 +0100)
Subject: Re: [PATCH] private mounts
References: <20050424201820.GA28428@infradead.org> <E1DPo3I-0000V0-00@localhost> <20050424205422.GK13052@parcelfarce.linux.theplanet.co.uk> <E1DPoCg-0000W0-00@localhost> <20050424210616.GM13052@parcelfarce.linux.theplanet.co.uk> <E1DPoRz-0000Y0-00@localhost> <20050424211942.GN13052@parcelfarce.linux.theplanet.co.uk> <E1DPofK-0000Yu-00@localhost> <20050425071047.GA13975@vagabond> <E1DQ0Mc-0007B5-00@dorka.pomaz.szeredi.hu> <20050430083516.GC23253@infradead.org>
Message-Id: <E1DRoDm-0002G9-00@dorka.pomaz.szeredi.hu>
From: Miklos Szeredi <miklos@szeredi.hu>
Date: Sat, 30 Apr 2005 11:25:10 +0200
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 984
Lines: 21

> > > I can't write a script that reads your mind. But I sure can write
> > > a script that finds out what you mounted in the other shells (with help
> > > of a little wrapper around the mount command).
> > 
> > How do you bind mount it from a different namespace?  You _do_ need
> > bind mount, since a new mount might require password input, etc...
> 
> Not nessecarily.  The filesystem gets called into ->get_sb for every mount,
> and can then decided whether to return an existing superblock instance or
> setup a new one.  If the credentials for the new mount match an old one
> it can just reuse it.  (e.g. for block based filesystem it will always reuse
> right now)

And if the credentials are checked in userspace (sshfs)?

Miklos
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