[RFC 07/12] generic/771: Stress fsx with atomic writes enabled

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

Stress file with atomic writes to ensure we excercise codepaths
where we are mixing different FS operations with atomic writes

Suggested-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
---
 tests/generic/771     | 49 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/771.out |  2 ++
 2 files changed, 51 insertions(+)
 create mode 100755 tests/generic/771
 create mode 100644 tests/generic/771.out

diff --git a/tests/generic/771 b/tests/generic/771
new file mode 100755
index 00000000..690dfa0a
--- /dev/null
+++ b/tests/generic/771
@@ -0,0 +1,49 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 IBM Corporation. All Rights Reserved.
+#
+# FS QA Test 771
+#
+# fuzz fsx with atomic writes
+#
+. ./common/preamble
+. ./common/atomicwrites
+_begin_fstest rw auto quick atomicwrites
+
+# Import common functions.
+. ./common/filter
+
+_require_test
+_require_odirect
+_require_scratch_write_atomic
+
+_scratch_mkfs >> $seqres.full 2>&1
+_scratch_mount  >> $seqres.full 2>&1
+
+testfile=$SCRATCH_MNT/testfile
+touch $testfile
+
+awu_max=$(_get_atomic_write_unit_max $testfile)
+blksz=$(_get_block_size $SCRATCH_MNT)
+bsize=`$here/src/min_dio_alignment $SCRATCH_MNT $SCRATCH_DEV`
+
+# fsx usage:
+#
+# -N numops: total # operations to do
+# -l flen: the upper bound on file size
+# -o oplen: the upper bound on operation size (64k default)
+# -w writebdy: $psize would make writes page aligned (on i386)
+# -Z: O_DIRECT (use -R, -W, -r and -w too)
+# -W: mapped write operations DISabled
+
+_run_fsx_on_file $testfile -N 10000 -a -o $awu_max  -l 500000 -r $bsize -w $bsize -Z -W $FSX_AVOID >> $seqres.full
+status=$?
+
+if [[ "$status" != "0" ]]
+then
+	echo "Somthing went wrong, check $seqres.full"
+fi
+
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/generic/771.out b/tests/generic/771.out
new file mode 100644
index 00000000..c2345c7b
--- /dev/null
+++ b/tests/generic/771.out
@@ -0,0 +1,2 @@
+QA output created by 771
+Silence is golden
-- 
2.49.0