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Date:	Mon, 16 Jan 2012 10:55:55 -0800
From:	Linus Torvalds <>
To:	Jan Kara <>
	Andrew Morton <>,
	Christoph Hellwig <>,
	Al Viro <>,
	LKML <>,
	Edward Shishkin <>
Subject: Re: [RFC PATCH 0/3] Stop clearing uptodate flag on write IO error

On Mon, Jan 16, 2012 at 8:01 AM, Jan Kara <> wrote:
>  Hum, let me understand this. I understand the meaning of buffer_uptodate
> bit as "the buffer has at least as new content as what is on disk". Now
> when storage cannot write the block under the buffer, the contents of the
> buffer is still "at least as new as what is (was) on disk".


Stop making crap up.

If the write fails, the buffer contents have *nothing* to do with what
is on disk.

You don't know what the disk contents are.

So clearly the buffer cannot be up-to-date.

Now, feel free to use *other* arguments for why we shouldn't clear the
up-to-date bit, but using the disk contents as one is pure and utter
garbage. And it is *obviously* pure and utter garbage.

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