[PATCH 9/9] fstests: verify exportfs file handles on cloned filesystems

Anand Jain
2026-02-26T14:42:14Z

Ensure that exportfs can correctly decode file handles on a cloned
filesystem across a mount cycle, by file handles generated on a
cloned device remain valid after mount cycle.

Signed-off-by: Anand Jain <asj@kernel.org>
---
tests/generic/795 | 67 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/795.out | 2 ++
2 files changed, 69 insertions(+)
create mode 100644 tests/generic/795
create mode 100644 tests/generic/795.out

diff --git a/tests/generic/795 b/tests/generic/795
new file mode 100644
index 000000000000..b6a75e500949
--- /dev/null
+++ b/tests/generic/795
@@ -0,0 +1,67 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test No. 795
+
+. ./common/preamble
+
+_begin_fstest auto quick exportfs clone
+
+_require_test
+_require_exportfs
+_require_scratch_dev_pool 2
+_require_test_program "open_by_handle"
+
+_cleanup()
+{
+ cd /
+ rm -r -f $tmp.*
+ _unmount $mnt2 2>/dev/null
+ _scratch_dev_pool_put
+}
+
+# Create test dir and test files, encode file handles and store to tmp file
+create_test_files()
+{
+ rm -rf $testdir
+ mkdir -p $testdir
+ $here/src/open_by_handle -cwp -o $tmp.handles_file $testdir $NUMFILES
+}
+
+# Decode file handles loaded from tmp file
+test_file_handles()
+{
+ local opt=$1
+ local when=$2
+
+ echo test_file_handles after $when
+ $here/src/open_by_handle $opt -i $tmp.handles_file $mnt2 $NUMFILES
+}
+
+_scratch_dev_pool_get 2
+_scratch_mkfs_sized_clone >$seqres.full 2>&1
+devs=($SCRATCH_DEV_POOL)
+mnt2=$TEST_DIR/mnt2
+mkdir -p $mnt2
+
+_scratch_mount $(_clone_mount_option)
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \
+ _fail "Failed to mount dev2"
+
+NUMFILES=1
+testdir=$mnt2/testdir
+
+# Decode file handles of files/dir after cycle mount
+create_test_files
+
+_scratch_unmount
+_unmount $mnt2
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \
+ _fail "Failed to mount dev2"
+_scratch_mount $(_clone_mount_option)
+
+test_file_handles -rp "cycle mount"
+
+status=0
+exit
diff --git a/tests/generic/795.out b/tests/generic/795.out
new file mode 100644
index 000000000000..774fe7487d65
--- /dev/null
+++ b/tests/generic/795.out
@@ -0,0 +1,2 @@
+QA output created by 795
+test_file_handles after cycle mount
--
2.43.0