linux-kernel - Re: [PATCH 6/7 v3] overlay: hybrid overlay filesystem prototype

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Date:	Mon, 27 Sep 2010 21:15:29 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Andreas Gruenbacher <agruen@...e.de>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Valerie Aurora <vaurora@...hat.com>, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	neilb@...e.de, viro@...iv.linux.org.uk
Subject: Re: [PATCH 6/7 v3] overlay: hybrid overlay filesystem prototype

Andreas Gruenbacher:
> I can think of arguments for either behavior, perhaps with a slight preference 
> for your suggestion (default = opaque).
>
> In any case, admins will need a way to flip opaque flags and remove undesired 
> whiteouts.

Agreed.
Aufs is providing two options for this issue, "diropq=always" and
"diropq=whiteouted". Several years ago, the default was "always". But
soon it changed to "whiteouted" and I have never received objection
from users.
As for as I know, some users are happy since the number of whiteouts was
reduced. Because they merge layers manually for system
maintenance. Unnecessary whiteouts are not good to them.

J. R. Okajima
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