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Re: [PATCH 4/4] xfstests: add mapped write fsx operations to 091

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 4/4] xfstests: add mapped write fsx operations to 091
From: Alex Elder <aelder@xxxxxxx>
Date: Fri, 8 Jul 2011 14:04:12 -0500
Cc: <xfs@xxxxxxxxxxx>
In-reply-to: <1310086426-30605-5-git-send-email-david@xxxxxxxxxxxxx>
References: <1310086426-30605-1-git-send-email-david@xxxxxxxxxxxxx> <1310086426-30605-5-git-send-email-david@xxxxxxxxxxxxx>
Reply-to: <aelder@xxxxxxx>
On Fri, 2011-07-08 at 10:53 +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> The recent busted fsx updates caused fsx to execute fsx with direct
> IO and mmapped reads and writes on an XFS filesystem. The result
> uncovered a direct-IO write vs mmap read bug to do with EOF
> sub-block zeroing on the direct IO write.
> 
> Hence whiel we do not recommend that pepole mix DIO with mmap on the
> same file, we should at least have tests that exercise it as they
> often show up other problems like this.
> 
> 
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>

Good idea.

Reviewed-by: Alex Elder <aelder@xxxxxxx>


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