linux-kernel - Re: [RFC] Union mounts/writable overlays design

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Message-ID: <7347.1255324754@jrobl>
Date:	Mon, 12 Oct 2009 14:19:14 +0900
From:	hooanon05@...oo.co.jp
To:	Valerie Aurora <vaurora@...hat.com>
Cc:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Union mounts/writable overlays design 


Valerie Aurora:
> In writable overlays, every directory will be copied up to the top
> writable overlay, so /u and /u/usr will both have the same st_dev.
> The copy up happens on lookup, so a stat() will trigger this copy up.
> A directory and a regular file in it will have different st_dev's,
> though.  Can you foresee any problems with that?

You're right.
I was confused with another implementation of UnionMount, sorry.
I think I had to sleep well.


J. R. Okajima
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