linux-kernel - Re: [RFC 0/7] [RFC] cramfs: fake write support

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Date:	Sun, 1 Jun 2008 10:52:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Phillip Lougher <phillip@...gher.demon.co.uk>
Cc:	David Newall <davidn@...idnewall.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@....de
Subject: Re: [RFC 0/7] [RFC] cramfs: fake write support

On Sunday 01 June 2008, Phillip Lougher wrote:
> If I read the patches correctly, when a file page is written to, only 
> that page gets copied into the page cache and locked, the other pages 
> continue to be read off disk from cramfs?  With Unionfs a page write 
> causes the entire file to be copied up to the r/w tmpfs and locked into 
> the page cache causing unnecessary RAM overhead.

Yes, that's right.

	Arnd <><
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