[PATCH v2 06/13] generic/1227: Add atomic write test using fio verify on file mixed mappings

[Ojaswin Mujoo <ojaswin@linux.ibm.com>]

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/1227     | 92 ++++++++++++++++++++++++++++++++++++++++++
 tests/generic/1227.out |  2 +
 2 files changed, 94 insertions(+)
 create mode 100755 tests/generic/1227
 create mode 100644 tests/generic/1227.out

diff --git a/tests/generic/1227 b/tests/generic/1227
new file mode 100755
index 00000000..e2668758
--- /dev/null
+++ b/tests/generic/1227
@@ -0,0 +1,92 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 IBM Corporation. All Rights Reserved.
+#
+# FS QA Test 1227
+#
+# 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
+
+_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/1227.out b/tests/generic/1227.out
new file mode 100644
index 00000000..2605d062
--- /dev/null
+++ b/tests/generic/1227.out
@@ -0,0 +1,2 @@
+QA output created by 1227
+Silence is golden
-- 
2.49.0