Re: [RFC 05/12] generic/769: Add atomic write test using fio verify on file mixed mappings

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Jun 11, 2025 at 03:04:48PM +0530, Ojaswin Mujoo wrote:
> From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
> 
> This tests uses fio to first create a file with mixed mappings. Then it
> does atomic writes using aio dio with parallel jobs to the same file
> with mixed mappings. This forces the filesystem allocator to allocate
> extents over mixed mapping regions to stress FS block allocators.
> 
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
> ---
>  tests/generic/769     | 101 ++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/769.out |   2 +
>  2 files changed, 103 insertions(+)
>  create mode 100755 tests/generic/769
>  create mode 100644 tests/generic/769.out
> 
> diff --git a/tests/generic/769 b/tests/generic/769
> new file mode 100755
> index 00000000..469d6344
> --- /dev/null
> +++ b/tests/generic/769
> @@ -0,0 +1,101 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2025 IBM Corporation. All Rights Reserved.
> +#
> +# FS QA Test 769
> +#
> +# Validate FS atomic write using fio crc check verifier on mixed mappings
> +# of a file.
> +#
> +. ./common/preamble
> +. ./common/atomicwrites
> +
> +_begin_fstest auto aio rw atomicwrites
> +
> +_require_scratch_write_atomic_multi_fsblock
> +_require_odirect
> +_require_aio
> +
> +function max()
> +{
> +	if (( $1 > $2 )); then
> +		echo "$1"
> +	else
> +		echo "$2"
> +	fi
> +}

Yeah, there's that function again.

The rest of the test looks fine.

--D

> +
> +_scratch_mkfs >> $seqres.full 2>&1
> +_scratch_mount
> +
> +touch "$SCRATCH_MNT/f1"
> +awu_min_write=$(_get_atomic_write_unit_min "$SCRATCH_MNT/f1")
> +awu_max_write=$(_get_atomic_write_unit_max "$SCRATCH_MNT/f1")
> +aw_bsize=$(max "$awu_min_write" "$((awu_max_write/4))")
> +
> +fsbsize=$(_get_block_size $SCRATCH_MNT)
> +
> +fio_config=$tmp.fio
> +fio_out=$tmp.fio.out
> +
> +FIO_LOAD=$(($(nproc) * 2 * LOAD_FACTOR))
> +SIZE=$((128 * 1024 * 1024))
> +
> +cat >$fio_config <<EOF
> +[global]
> +ioengine=libaio
> +fallocate=none
> +filename=$SCRATCH_MNT/test-file
> +filesize=$SIZE
> +bs=$fsbsize
> +direct=1
> +verify=0
> +group_reporting=1
> +
> +# Create written extents
> +[written_blocks]
> +stonewall
> +ioengine=libaio
> +rw=randwrite
> +io_size=$((SIZE/3))
> +random_generator=lfsr
> +
> +# Create unwritten extents
> +[unwritten_blocks]
> +stonewall
> +ioengine=falloc
> +rw=randwrite
> +io_size=$((SIZE/3))
> +random_generator=lfsr
> +
> +# atomic write to mixed mappings of written/unwritten/holes
> +[atomic_write_aio_dio_job]
> +stonewall
> +direct=1
> +ioengine=libaio
> +rw=randwrite
> +bs=$aw_bsize
> +iodepth=$FIO_LOAD
> +numjobs=$FIO_LOAD
> +size=$SIZE
> +random_generator=lfsr
> +verify_state_save=0
> +verify=crc32c
> +verify_fatal=1
> +verify_dump=0
> +verify_backlog=1024
> +verify_async=4
> +verify_write_sequence=0
> +atomic=1
> +EOF
> +
> +_require_fio $fio_config
> +
> +cat $fio_config >> $seqres.full
> +$FIO_PROG $fio_config --output=$fio_out
> +cat $fio_out >> $seqres.full
> +
> +# success, all done
> +echo Silence is golden
> +status=0
> +exit
> diff --git a/tests/generic/769.out b/tests/generic/769.out
> new file mode 100644
> index 00000000..1512b439
> --- /dev/null
> +++ b/tests/generic/769.out
> @@ -0,0 +1,2 @@
> +QA output created by 769
> +Silence is golden
> -- 
> 2.49.0
> 
>