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Date:   Wed, 15 Jan 2020 04:03:49 +0530
From:   Ritesh Harjani <>
To:     Christoph Hellwig <>
Subject: Re: [RFC 0/2] ext4: Fix stale data read exposure problem with DIO

On 1/14/20 10:09 PM, Christoph Hellwig wrote:
>> Currently there is a small race window as pointed out by Jan [2] where, when
>> ext4 tries to allocate a written block for mapped files and if DIO read is in
>> progress, then this may result into stale data read exposure problem.
> Do we have a test case for the problem?

I am not very sure if we have it in xfstests, (since I guess, DIO read 
during mmap writes is not well supported anyways).
But sure I was anyway thinking of writing one for my unit testing. Till
now I was mainly following that theoretically it is possible, although
it may be hard to catch it practically.

> Please add at very least the fsdevel and xfs lists to iomap patches.

Yes, sorry about that. Will cc' in next time.


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