[PATCH 3/3] generic: add race test that mmap write to target of reflink

From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <fstests@vger.kernel.org>
Subject: [PATCH 3/3] generic: add race test that mmap write to target of reflink
Date: Mon, 15 Nov 2021 11:41:08 +0800	[thread overview]
Message-ID: <20211115034108.1328167-4-ruansy.fnst@fujitsu.com> (raw)
In-Reply-To: <20211115034108.1328167-1-ruansy.fnst@fujitsu.com>

Test for races or FS corruption when mmap writing to a file that's also
the target of a reflink operation. (MMAP version of generic/168,170)

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
 tests/generic/932     | 64 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/932.out |  4 +++
 2 files changed, 68 insertions(+)
 create mode 100755 tests/generic/932
 create mode 100644 tests/generic/932.out

diff --git a/tests/generic/932 b/tests/generic/932
new file mode 100755
index 00000000..60a6deb8
--- /dev/null
+++ b/tests/generic/932
@@ -0,0 +1,64 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. xxx
+#
+# Test for races or FS corruption when mmap writing to a file that's also
+# the target of a reflink operation. (MMAP version of generic/168,170)
+#
+. ./common/preamble
+_begin_fstest auto clone
+
+_register_cleanup "_cleanup" BUS
+
+# Import common functions.
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_require_scratch_reflink
+
+echo "Format and mount"
+_scratch_mkfs > $seqres.full 2>&1
+_scratch_mount >> $seqres.full 2>&1
+
+testdir=$SCRATCH_MNT/test-$seq
+finished_file=/tmp/finished
+rm -rf $finished_file
+mkdir $testdir
+
+loops=1024
+nr_loops=$((loops - 1))
+blksz=65536
+
+echo "Initialize files"
+echo >> $seqres.full
+_pwrite_byte 0x61 0 $((loops * blksz)) $testdir/file1 >> $seqres.full
+_pwrite_byte 0x62 0 $((loops * blksz)) $testdir/file2 >> $seqres.full
+_scratch_cycle_mount
+
+# mmap overwriter...
+overwrite() {
+	while [ ! -e $finished_file ]; do
+		seq $nr_loops -1 0 | while read i; do
+			$XFS_IO_PROG -f -c "mmap -rw $((i * blksz)) $blksz" \
+				-c "mwrite -S 0x63 $((i * blksz)) $blksz" $testdir/file2 >> $seqres.full
+		done
+	done
+}
+
+echo "Reflink and mmap write the target"
+overwrite &
+seq 1 10 | while read j; do
+	seq 0 $nr_loops | while read i; do
+		_reflink_range  $testdir/file1 $((i * blksz)) \
+				$testdir/file2 $((i * blksz)) $blksz >> $seqres.full
+		[ $? -ne 0 ] && exit
+	done
+done
+touch $finished_file
+wait
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/932.out b/tests/generic/932.out
new file mode 100644
index 00000000..95be7764
--- /dev/null
+++ b/tests/generic/932.out
@@ -0,0 +1,4 @@
+QA output created by 932
+Format and mount
+Initialize files
+Reflink and mmap write the target
-- 
2.33.0



