linux-kernel - Re: [PATCH] fs: Don't ignore MS_RDONLY in bind and not remount case.

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Message-Id: <20091030085644.2157915C033@msa104.auone-net.jp>
Date:	Fri, 30 Oct 2009 17:56:41 +0900
From:	Kusanagi Kouichi <slash@...auone-net.jp>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: Don't ignore MS_RDONLY in bind and not remount
 case.

On 2009-10-30 01:53:37 -0400, Christoph Hellwig wrote:
> On Fri, Oct 30, 2009 at 02:31:46PM +0900, Kusanagi Kouichi wrote:
> > A readonly bind mount needed to be created in 2 steps
> > 
> > # mount --bind
> > # mount --bind -o remount,ro
> > 
> > instead of single
> > 
> > # mount --bind -o ro
> > 
> > because MS_RDONLY is ignored in bind and not remount case.
> 
> I'm pretty sure that was intentional, but I don't remember why anymore.

I could not find any reason to restrict this.
Could you tell me the reason of this restriction?
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