linux-kernel - Re: [PATCH 3/3] Btrfs: add basic DIO read support

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Message-ID: <20100507095537.GD19699@shareable.org>
Date:	Fri, 7 May 2010 10:55:37 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Josef Bacik <josef@...hat.com>
Cc:	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] Btrfs: add basic DIO read support

Josef Bacik wrote:
> 3) Lock the entire range during DIO.  I originally had it so we would lock the
> extents as get_block was called, and then unlock them as the endio function was
> called, which worked great, but if we ever had an error in the submit_io hook,
> we could have locked an extent that would never be submitted for IO, so we
> wouldn't be able to unlock it, so this solution fixed that problem and made it a
> bit cleaner.

Does this prevent concurrent DIOs to overlapping or nearby ranges?

Thanks,
-- Jamie
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