linux-ext4 - Re: [PATCH v3] ext4: Prevent race while waling extent tree

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Date:	Tue, 13 Nov 2012 10:51:04 -0800
From:	Zach Brown <zab@...hat.com>
To:	Peng Tao <bergwolf@...il.com>
Cc:	Lukáš Czerner <lczerner@...hat.com>,
	linux-ext4@...r.kernel.org, tytso@....edu, dmonakhov@...nvz.org
Subject: Re: [PATCH v3] ext4: Prevent race while waling extent tree

> The deadlock mentioned by Zach Brown can be fixed by simply switching
> to GFP_NOFS.

That's a start, but it doesn't address the copy_to_user().  You could
pin that memory, I suppose, but that starts to feel like more trouble
than its worth.

- z
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