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

[John Garry]

On 10/08/2025 14:42, Ojaswin Mujoo wrote:
> From: "Ritesh Harjani (IBM)"<ritesh.list@xxxxxxxxx>
>
> 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@xxxxxxxxx>
> Reviewed-by: Darrick J. Wong<djwong@xxxxxxxxxx>
> Signed-off-by: Ojaswin Mujoo<ojaswin@xxxxxxxxxxxxx>
> ---
>   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