[PATCH v4 05/10] btrfs: check if cloned device mounts with tempfsid

[Anand Jain <anand.jain@oracle.com>]

If another device with the same fsid and uuid would mount then verify if
it mounts with a temporary fsid.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 tests/btrfs/312     | 78 +++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/312.out | 19 +++++++++++
 2 files changed, 97 insertions(+)
 create mode 100755 tests/btrfs/312
 create mode 100644 tests/btrfs/312.out

diff --git a/tests/btrfs/312 b/tests/btrfs/312
new file mode 100755
index 000000000000..eedcf11a2308
--- /dev/null
+++ b/tests/btrfs/312
@@ -0,0 +1,78 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oracle.  All Rights Reserved.
+#
+# FS QA Test 312
+#
+# On a clone a device check to see if tempfsid is activated.
+#
+. ./common/preamble
+_begin_fstest auto quick clone tempfsid
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $mnt1 > /dev/null 2>&1
+	rm -r -f $tmp.*
+	rm -r -f $mnt1
+}
+
+. ./common/filter.btrfs
+. ./common/reflink
+
+_supported_fs btrfs
+_require_scratch_dev_pool 2
+_scratch_dev_pool_get 2
+_require_btrfs_fs_feature temp_fsid
+
+mnt1=$TEST_DIR/$seq/mnt1
+mkdir -p $mnt1
+
+create_cloned_devices()
+{
+	local dev1=$1
+	local dev2=$2
+
+	echo -n Creating cloned device...
+	_mkfs_dev -fq -b $((1024 * 1024 * 300)) $dev1
+
+	_mount $dev1 $SCRATCH_MNT
+
+	$XFS_IO_PROG -fc 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/foo | \
+								_filter_xfs_io
+	$UMOUNT_PROG $SCRATCH_MNT
+	# device dump of $dev1 to $dev2
+	dd if=$dev1 of=$dev2 bs=300M count=1 conv=fsync status=none || \
+							_fail "dd failed: $?"
+	echo done
+}
+
+mount_cloned_device()
+{
+	echo ---- $FUNCNAME ----
+	create_cloned_devices ${SCRATCH_DEV_NAME[0]} ${SCRATCH_DEV_NAME[1]}
+
+	echo Mounting original device
+	_mount ${SCRATCH_DEV_NAME[0]} $SCRATCH_MNT
+	$XFS_IO_PROG -fc 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/foo | \
+								_filter_xfs_io
+	check_fsid ${SCRATCH_DEV_NAME[0]}
+
+	echo Mounting cloned device
+	_mount ${SCRATCH_DEV_NAME[1]} $mnt1 || \
+				_fail "mount failed, tempfsid didn't work"
+
+	echo cp reflink must fail
+	_cp_reflink $SCRATCH_MNT/foo $mnt1/bar 2>&1 | \
+						_filter_testdir_and_scratch
+
+	check_fsid ${SCRATCH_DEV_NAME[1]}
+}
+
+mount_cloned_device
+
+_scratch_dev_pool_put
+
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/312.out b/tests/btrfs/312.out
new file mode 100644
index 000000000000..b7de6ce3cc6e
--- /dev/null
+++ b/tests/btrfs/312.out
@@ -0,0 +1,19 @@
+QA output created by 312
+---- mount_cloned_device ----
+Creating cloned device...wrote 9000/9000 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+done
+Mounting original device
+wrote 9000/9000 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+On disk fsid:		FSID
+Metadata uuid:		FSID
+Temp fsid:		FSID
+Tempfsid status:	0
+Mounting cloned device
+cp reflink must fail
+cp: failed to clone 'TEST_DIR/312/mnt1/bar' from 'SCRATCH_MNT/foo': Invalid cross-device link
+On disk fsid:		FSID
+Metadata uuid:		FSID
+Temp fsid:		TEMPFSID
+Tempfsid status:	1
-- 
2.39.3