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Re: [Bug] XFS: DIO random write + BufferIO read

To: Zhi Yong Wu <zwu.kernel@xxxxxxxxx>
Subject: Re: [Bug] XFS: DIO random write + BufferIO read
From: Jeff Moyer <jmoyer@xxxxxxxxxx>
Date: Tue, 08 Apr 2014 10:28:10 -0400
Cc: xfstests <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, jack@xxxxxxx, "linux-fsdevel\@vger.kernel.org" <linux-fsdevel@xxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <CAEH94LiJ6PBRRdFc4aZapLEPT7B7==0dUKQZqzQ6+vQpGpxHLg@xxxxxxxxxxxxxx> (Zhi Yong Wu's message of "Fri, 4 Apr 2014 23:09:10 +0800")
References: <CAEH94LiJ6PBRRdFc4aZapLEPT7B7==0dUKQZqzQ6+vQpGpxHLg@xxxxxxxxxxxxxx>
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.1 (gnu/linux)
Zhi Yong Wu <zwu.kernel@xxxxxxxxx> writes:

> HI
> When i try something on XFS filesytem, i hit one issue as below:
> One main task create multiple threads at first, Then it will dio
> random write some files with random offset and length for each thread.
> When those files get ready, those multiple threads will bufferio read
> them and check if the data are same as their corresponding buffer. In
> theory, they should be same, but the actual result isn't what we
> expect
> By the way, i did the same try on ext3 filesystem, but didn't get any
> such issue.

What kernel version?


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