linux-kernel - Re: [PATCH] [16/19] HWPOISON: Enable .remove_error

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Message-ID: <20090812084613.GB32342@wotan.suse.de>
Date:	Wed, 12 Aug 2009 10:46:13 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>, tytso@....edu,
	hch@...radead.org, mfasheh@...e.com, aia21@...tab.net,
	hugh.dickins@...cali.co.uk, swhiteho@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, fengguang.wu@...el.com,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	Taketoshi Sakuraba <taketoshi.sakuraba.hc@...achi.com>
Subject: Re: [PATCH] [16/19] HWPOISON: Enable .remove_error_page for migration aware file systems

On Wed, Aug 12, 2009 at 10:23:31AM +0200, Andi Kleen wrote:
> > page corruption, IMO, because by definition they should be able to
> > tolerate panic. But if they do not know about this change to -EIO
> > semantics, then it is quite possible to cause problems.
> 
> There's no change really. You already have this problem with
> any metadata error, which can cause similar trouble.
> If the application handles those correctly it will also 
> handle hwpoison correctly.

What do you mean metadata error?

To be clear, we're talking about safety given by a panic on any
memory error, versus safety of this hwpoison code (specifically
which removes dirty pagecache pages as -EIO).

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