[PATCH 4/4] fstests: test xfs swapext log replay

[Zorro Lang <zlang@redhat.com>]

If an inode had been in btree format and had a data fork owner change
logged (XFS_ILOG_DOWNER), after changing the format to non-btree, will
hit an ASSERT in xfs_recover_inode_owner_change() which enforces that
if XFS_ILOG_[AD]OWNER is set.

Signed-off-by: Zorro Lang <zlang@redhat.com>
---

Hi,

3+ years past, this test is still failed on latest upstream linux kernel,
as we talked below:
https://patchwork.kernel.org/project/fstests/patch/20181223141721.5318-1-zlang@redhat.com/

I think it's time to bring it back to talk again. If it's a case issue, I'll fix.
If it's a bug, means this case is good to merge.

Thanks,
Zorro

 tests/xfs/999     | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/999.out |  2 ++
 2 files changed, 60 insertions(+)
 create mode 100755 tests/xfs/999
 create mode 100644 tests/xfs/999.out

diff --git a/tests/xfs/999 b/tests/xfs/999
new file mode 100755
index 00000000..b1d58671
--- /dev/null
+++ b/tests/xfs/999
@@ -0,0 +1,58 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Red Hat Inc.  All Rights Reserved.
+#
+# FS QA Test 999
+#
+# If an inode had been in btree format and had a data fork owner change
+# logged, after changing the format to non-btree, will hit an ASSERT or
+# fs corruption.
+# This case trys to cover: dc1baa715bbf ("xfs: do not log/recover swapext
+# extent owner changes for deleted inodes")
+#
+. ./common/preamble
+_begin_fstest auto quick fsr
+
+# Import common functions.
+. ./common/filter
+
+# real QA test starts here
+_supported_fs generic
+_require_scratch
+_scratch_mkfs_xfs | _filter_mkfs 2>$tmp.mkfs >/dev/null
+. $tmp.mkfs
+
+_scratch_mount
+localfile=$SCRATCH_MNT/fragfile
+
+# Try to create a file with 1024 * (3 blocks + 1 hole):
+# +----------+--------+-------+----------+--------+
+# | 3 blocks | 1 hole |  ...  | 3 blocks | 1 hole |
+# +----------+--------+-------+----------+--------+
+#
+# The number of extents we can get maybe more or less than 1024, this method
+# just to get a btree inode format.
+filesize=$((dbsize * 1024 * 4))
+for i in `seq $filesize -$dbsize 0`; do
+	if [ $((i % (3 * dbsize))) -eq 0 ]; then
+		continue
+	fi
+	$XFS_IO_PROG -f -d -c "pwrite $i $dbsize" $localfile >> $seqres.full
+done
+
+# Make a data fork owner change log
+$XFS_FSR_PROG -v -d $localfile >> $seqres.full 2>&1
+
+# Truncate the file to 0, and change the inode format to extent, then shutdown
+# the fs to keep the XFS_ILOG_DOWNER flag
+$XFS_IO_PROG -t -x -c "pwrite 0 $dbsize" \
+	     -c "fsync" \
+	     -c "shutdown" $localfile >> $seqres.full
+
+# Cycle mount, to replay the log
+_scratch_cycle_mount
+
+echo "Silence is golden"
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/999.out b/tests/xfs/999.out
new file mode 100644
index 00000000..3b276ca8
--- /dev/null
+++ b/tests/xfs/999.out
@@ -0,0 +1,2 @@
+QA output created by 999
+Silence is golden
-- 
2.31.1