[PATCH 13/13] xfs/2308: test rebuilding of csum files in xfs_repair

[Christoph Hellwig <hch@lst.de>]

Plus handling of corrupted csum files in the kernel as a side effect.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/xfs/2308     | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/2308.out |  4 ++++
 2 files changed, 51 insertions(+)
 create mode 100755 tests/xfs/2308
 create mode 100644 tests/xfs/2308.out

diff --git a/tests/xfs/2308 b/tests/xfs/2308
new file mode 100755
index 000000000000..5c4f647ced7a
--- /dev/null
+++ b/tests/xfs/2308
@@ -0,0 +1,47 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2026 Christoph Hellwig.
+#
+# FS QA Test No. 2308
+#
+# Corrupt rtcsum and check that scrub and different kinds of reads catch them.
+#
+. ./common/preamble
+_begin_fstest auto quick zone datacsum scrub
+
+. ./common/filter
+. ./common/fuzzy
+
+_require_scratch_nocheck
+
+_scratch_mkfs >> $seqres.full 2>&1
+_scratch_mount
+_require_xfs_data_csum $TEST_DIR
+
+cat /bin/sh > $SCRATCH_MNT/sh
+sync $SCRATCH_MNT
+
+rg=`xfs_bmap -v $SCRATCH_MNT/sh | _filter_bmap_gno`
+rg="${rg// /}"
+
+_scratch_unmount
+
+$XFS_DB_PROG -x $SCRATCH_DEV \
+	-c "path -m /rtgroups/$rg.csum" \
+	-c 'dblock 0' \
+	-c 'write csums[0] 4266'
+
+_scratch_mount
+$XFS_SCRUB_PROG -x -a 1 $SCRATCH_MNT >> $seqres.full 2>&1
+if [ $? -eq 0 ]; then
+	_fail "scrub did not find corruption"
+fi
+
+# Test buffered I/O
+$XFS_IO_PROG -c 'pread 0 64k' $SCRATCH_MNT/sh
+
+# Test direct  I/O
+$XFS_IO_PROG -d -c 'pread 0 64k' $SCRATCH_MNT/sh
+
+status=0
+exit
diff --git a/tests/xfs/2308.out b/tests/xfs/2308.out
new file mode 100644
index 000000000000..55f6a0c97264
--- /dev/null
+++ b/tests/xfs/2308.out
@@ -0,0 +1,4 @@
+QA output created by 2308
+csums[0] = 4266
+pread: Input/output error
+pread: Input/output error
-- 
2.53.0