linux-kernel - Re: [PATCH v2] tmpfs: fix race between umount and writepage

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Message-ID: <4DC90AE8.101@parallels.com>
Date:	Tue, 10 May 2011 13:52:40 +0400
From:	Konstantin Khlebnikov <khlebnikov@...allels.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tmpfs: fix race between umount and writepage

Hugh Dickins wrote:
> On Sun, 8 May 2011, Konstantin Khlebnikov wrote:
>>
>> Ok, I can test final patch-set on the next week.
>> Also I can try to add some swapoff test-cases.
>
> That would be helpful if you have the time: thank you.

I Confirm, patch 1/3 really fixes race between writepage and umount, as expected.

In patch 2/3: race-window between unlock_page and iput extremely small.
My test works fine in parallel with thirty random swapon-swapoff,
but it works without this patch too, thus I cannot catch this race.

I apply patch 3/3 too, but have not tested this case.
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