generic: add race test that mmap write to target of reflink

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>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/tests/generic/672 b/tests/generic/672
new file mode 100755 (executable)
index 0000000..9e3a97e
--- /dev/null
+++ b/tests/generic/672
@@ -0,0 +1,64 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 672
+#
+# 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/672.out b/tests/generic/672.out
new file mode 100644 (file)
index 0000000..e0f8b79
--- /dev/null
+++ b/tests/generic/672.out
@@ -0,0 +1,4 @@
+QA output created by 672
+Format and mount
+Initialize files
+Reflink and mmap write the target