[PATCH] generic: test which tries to exercise AIO/DIO into unwritten space

["Theodore Ts'o" <tytso@mit.edu>]

This test verifies that the an unwritten extent is properly marked as
written after writing into it.

There was a hard-to-hit bug which would occasionally trigger with ext4
for which this test was a reproducer.  This has been fixed after
moving ext4 to use iomap for Direct I/O's, although as of this
writing, there are still some occasional failures on ext4 when block
size < page size.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 tests/generic/623     | 109 ++++++++++++++++++++++++++++++++++++++++++
 tests/generic/623.out |   4 ++
 tests/generic/group   |   1 +
 3 files changed, 114 insertions(+)
 create mode 100755 tests/generic/623
 create mode 100644 tests/generic/623.out

diff --git a/tests/generic/623 b/tests/generic/623
new file mode 100755
index 00000000..74136fef
--- /dev/null
+++ b/tests/generic/623
@@ -0,0 +1,109 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# FSQA Test No. 623
+#
+# AIO/DIO stress test
+# Run random AIO/DIO activity on an file system with unwritten regions
+#
+# This test verifies that the an unwritten extent is properly marked
+# as written after writing into it.
+#
+# There was a hard-to-hit bug which would occasionally trigger with
+# ext4 for which this test was a reproducer.  This has been fixed
+# after moving ext4 to use iomap for Direct I/O's, although as of this
+# writing, there are still some occasional failures on ext4 when block
+# size < page size.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+fio_config=$tmp.fio
+status=1	# failure is the default!
+trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs generic
+_require_test
+_require_scratch
+_require_odirect
+_require_block_device $SCRATCH_DEV
+
+NUM_JOBS=$((4*LOAD_FACTOR))
+BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
+FILE_SIZE=$(((BLK_DEV_SIZE * 512) * 3 / 4))
+
+max_file_size=$((5 * 1024 * 1024 * 1024))
+if [ $max_file_size -lt $FILE_SIZE ]; then
+	FILE_SIZE=$max_file_size
+fi
+SIZE=$((FILE_SIZE / 2))
+
+cat >$fio_config <<EOF
+###########
+# $seq test fio activity
+# Filenames derived from jobsname and jobid like follows:
+# ${JOB_NAME}.${JOB_ID}.${ITERATION_ID}
+[global]
+ioengine=libaio
+bs=128k
+directory=${SCRATCH_MNT}
+filesize=${FILE_SIZE}
+size=${SIZE}
+iodepth=$((128*$LOAD_FACTOR))
+fallocate=native
+
+# Perform direct aio and verify data
+# This test case should check use-after-free issues
+[aio-dio-verifier]
+numjobs=1
+verify=crc32c-intel
+verify_fatal=1
+verify_dump=1
+verify_backlog=1024
+verify_async=4
+direct=1
+blocksize_range=4100k-8200k
+blockalign=4k
+rw=randwrite
+filename=test-file
+
+EOF
+
+rm -f $seqres.full
+
+_require_fio $fio_config
+_require_xfs_io_command "falloc"
+
+_workout()
+{
+	echo ""
+	echo "Run fio with random aio-dio pattern"
+	echo ""
+	cat $fio_config >>  $seqres.full
+	run_check $FIO_PROG $fio_config
+}
+
+_scratch_mkfs >> $seqres.full 2>&1
+_scratch_mount
+
+if ! _workout; then
+	_scratch_unmount 2>/dev/null
+	exit
+fi
+
+if ! _scratch_unmount; then
+	echo "failed to umount"
+	status=1
+	exit
+fi
+status=0
+exit
diff --git a/tests/generic/623.out b/tests/generic/623.out
new file mode 100644
index 00000000..e10c7fd9
--- /dev/null
+++ b/tests/generic/623.out
@@ -0,0 +1,4 @@
+QA output created by 623
+
+Run fio with random aio-dio pattern
+
diff --git a/tests/generic/group b/tests/generic/group
index b10fdea4..24f53ed7 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -625,3 +625,4 @@
 620 auto mount quick
 621 auto quick encrypt
 622 auto shutdown metadata atime
+623 aio rw stress
-- 
2.30.0