linux-kernel - Re: [PATCH 4/4] Btrfs: add basic DIO read/write support V3

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Message-ID: <20100513152639.GA30954@infradead.org>
Date:	Thu, 13 May 2010 11:26:39 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Josef Bacik <josef@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 4/4] Btrfs: add basic DIO read/write support V3

On Thu, May 13, 2010 at 11:31:45AM -0400, Josef Bacik wrote:
> AIO's aio_complete does kmap with KM_IRQ0/1 and it gets called in the same
> context as the btrfs completion handler, so if it's ok for aio_complete it
> should be ok for btrfs right?  Thanks,

aio_complete does a spin_lock_irqsave before that, which disables
interrupts on the local CPU.

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