linux-ext4 - Re: [PATCH v3 05/13] generic/1226: Add atomic write test using fio crc check verifier

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Message-ID: <aIMjrunlU04jI2lF@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com>
Date: Fri, 25 Jul 2025 11:57:37 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: John Garry <john.g.garry@...cle.com>
Cc: Zorro Lang <zlang@...hat.com>, fstests@...r.kernel.org,
        Ritesh Harjani <ritesh.list@...il.com>, djwong@...nel.org,
        tytso@....edu, linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH v3 05/13] generic/1226: Add atomic write test using fio
 crc check verifier

On Wed, Jul 23, 2025 at 05:25:41PM +0100, John Garry wrote:
> On 23/07/2025 14:51, Ojaswin Mujoo wrote:
> > > > No, its just something i hardcoded for that particular run. This patch
> > > > doesn't enforce hardware only atomic writes
> > > If we are to test this for XFS then we need to ensure that HW atomics are
> > > available.
> > Why is that? Now with the verification step happening after writes,
> > software atomic writes should also pass this test since there are no
> > racing writes to the verify reads.
> 
> Sure, but racing software atomic writes against other software atomic writes
> is not safe.
> 
> Thanks,
> John

What do you mean by not safe? Does it mean the test can fail?