From mboxrd@z Thu Jan  1 00:00:00 1970
From: "J. R. Okajima" <hooanon05@yahoo.co.jp>
Subject: Re: [PATCH 6/6] overlay: overlay filesystem documentation
Date: Tue, 19 Apr 2011 13:13:53 +0900
Message-ID: <6291.1303186433@jrobl>
References: <1303142440-26328-1-git-send-email-miklos@szeredi.hu> <1303142440-26328-7-git-send-email-miklos@szeredi.hu> <7795.1303182317@jrobl> <20110419135818.024cd289@notabene.brown>
Cc: Miklos Szeredi <miklos@szeredi.hu>, viro@ZenIV.linux.org.uk,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	apw@canonical.com, nbd@openwrt.org, hramrach@centrum.cz,
	Miklos Szeredi <mszeredi@suse.cz>
To: NeilBrown <neilb@suse.de>
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NeilBrown:
> Only to top level of an overlay stack is writable.  All others are or should
> be read only.  So only the top level can change.
>
> So in your example, fileA will be copied from ro1 directly into rwN where it
> will then be appended to.

I see.
When I have time, I will try building overlayfs.
Thank you.


J. R. Okajima