linux-kernel - Re: [PATCH v4 10/11] ext4: Atomic writes test for bigalloc using fio crc verifier on multiple files

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Message-ID: <7c4824a6-8922-470d-915c-e783a4e0e9cc@oracle.com>
Date: Wed, 13 Aug 2025 14:45:28 +0100
From: John Garry <john.g.garry@...cle.com>
To: Ojaswin Mujoo <ojaswin@...ux.ibm.com>, Zorro Lang <zlang@...hat.com>,
        fstests@...r.kernel.org
Cc: 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 v4 10/11] ext4: Atomic writes test for bigalloc using fio
 crc verifier on multiple files

On 10/08/2025 14:42, Ojaswin Mujoo wrote:
> From: "Ritesh Harjani (IBM)"<ritesh.list@...il.com>
> 
> Brute force all possible blocksize clustersize combination on a bigalloc
> filesystem for stressing atomic write using fio data crc verifier. We run
> multiple threads in parallel with each job writing to its own file. The
> parallel jobs running on a constrained filesystem size ensure that we
> stress the ext4 allocator to allocate contiguous extents.
> 
> This test might do overlapping atomic writes but that should be okay
> since overlapping parallel hardware atomic writes don't cause tearing as
> long as io size is the same for all writes.
> 
> Signed-off-by: Ritesh Harjani (IBM)<ritesh.list@...il.com>
> Reviewed-by: Darrick J. Wong<djwong@...nel.org>
> Signed-off-by: Ojaswin Mujoo<ojaswin@...ux.ibm.com>
> ---
>   tests/ext4/062     | 176 +++++++++++++++++++++++++++++++++++++++++++++
>   tests/ext4/062.out |   2 +
>   2 files changed, 178 insertions(+)
>   create mode 100755 tests/ext4/062
>   create mode 100644 tests/ext4/062.out

Is the only difference to 061 that we have multiple files (and not a 
single file)?

Thanks,
John