linux-kernel - Re: [PATCH 4/67] aufs configuration

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Message-ID: <8238.1211163790@jrobl>
Date:	Mon, 19 May 2008 11:23:10 +0900
From:	hooanon05@...oo.co.jp
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/67] aufs configuration 


Hi,
Thank you for your review and comments.

I will fix as you pointed out.

Jan Engelhardt:
> >+config AUFS_ROBR
> >+	bool "Aufs as an readonly branch of another aufs"
> >+	depends on AUFS
> >+	default n
> >+	help
> >+	If you want make your aufs to be a part of another aufs, then
> >+	enable this option. In other words, you can specify your aufs
> >+	path in 'br:' mount option for another aufs, but cannot
> >+	specify 'rw' as the branch permission.
> >+	It will damage the performance.
> >+	See detail in aufs.5.
> 
> IIRC, unionfs did not need such an option, so why does AUFS?

The *current* unionfs doesn't support such nested mount, ie. unionfs as
a branch of another unionfs mount.
Aufs supports it only readonly mode (if you enable this configuration).


> Performance is not "damaged" but "hurt"  :-) [or just "will negatively
> impact performance"]

English language is much more difficult than C language for me...


Junjiro Okajima
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