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From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH] xfs: avoid direct I/O write vs buffered I/O race
Date: Tue, 30 Aug 2011 16:29:24 +1000	[thread overview]
Message-ID: <20110830062924.GP3162@dastard> (raw)
In-Reply-To: <20110827144253.GA16381@infradead.org>

On Sat, Aug 27, 2011 at 10:42:53AM -0400, Christoph Hellwig wrote:
> Currently a buffered reader or writer can add pages to the pagecache
> while we are waiting for the iolock in xfs_file_dio_aio_write.  Prevent
> this by re-checking mapping->nrpages after we got the iolock, and if
> nessecary upgrade the lock to exclusive mode.  To simplify this a bit
> only take the ilock inside of xfs_file_aio_write_checks.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks sane. Pushing the ILOCK completely into
xfs_file_aio_write_checks() is a nice segregation of locking
responsibilities.

Reviewed-by: Dave Chinner <dchinner@redhat.com>

-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2011-08-30  6:29 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-27 14:42 [PATCH] xfs: avoid direct I/O write vs buffered I/O race Christoph Hellwig
2011-08-30  6:29 ` Dave Chinner [this message]
2011-09-12 18:43 ` Alex Elder

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