On Wed, Jun 11, 2025 at 06:57:06PM -0700, Catherine Hoang wrote:
> Add a helper to check that we can perform multi block atomic writes. We will
> use this in the following patches that add testing for large atomic writes.
> This helper will prevent these tests from running on kernels that only support
> single block atomic writes.
>
> Signed-off-by: Catherine Hoang <catherine.hoang@xxxxxxxxxx>
> Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>
> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
> ---
> common/atomicwrites | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/common/atomicwrites b/common/atomicwrites
> index 391bb6f6..88f49a1a 100644
> --- a/common/atomicwrites
> +++ b/common/atomicwrites
> @@ -24,6 +24,27 @@ _get_atomic_write_segments_max()
> grep -w atomic_write_segments_max | grep -o '[0-9]\+'
> }
>
> +_require_scratch_write_atomic_multi_fsblock()
> +{
> + _require_scratch
> +
> + _scratch_mkfs > /dev/null 2>&1 || \
> + _notrun "cannot format scratch device for atomic write checks"
> + _try_scratch_mount || \
> + _notrun "cannot mount scratch device for atomic write checks"
> +
> + local testfile=$SCRATCH_MNT/testfile
> + touch $testfile
> +
> + local bsize=$(_get_file_block_size $SCRATCH_MNT)
> + local awu_max_fs=$(_get_atomic_write_unit_max $testfile)
> +
> + _scratch_unmount
> +
> + test $awu_max_fs -ge $((bsize * 2)) || \
> + _notrun "multi-block atomic writes not supported by this filesystem"
> +}
> +
Thanks for adding the helper. Looks good, feel free to add:
Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
> _require_scratch_write_atomic()
> {
> _require_scratch
> --
> 2.34.1
>
