[PATCH v2] f2fs/008: test snapshot creation/deletion on lvm device

[Chao Yu <chao@kernel.org>]

This patch introduce a regression testcase to check whether
f2fs can handle discard correctly once underlying lvm device
changes to not support discard after user creates snapshot
on it.

Related bug was fixed by commit bc8aeb04fd80 ("f2fs: fix to
drop all discards after creating snapshot on lvm device")

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
v2:
- fix typo
 tests/f2fs/008     | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/008.out |  2 ++
 2 files changed, 55 insertions(+)
 create mode 100755 tests/f2fs/008
 create mode 100644 tests/f2fs/008.out

diff --git a/tests/f2fs/008 b/tests/f2fs/008
new file mode 100755
index 00000000..38581c7b
--- /dev/null
+++ b/tests/f2fs/008
@@ -0,0 +1,53 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oppo.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/008
+#
+# This is a regression test to check whether f2fs can handle
+# discard correctly once underlying lvm device changes to not
+# support discard after user creates snapshot on it.
+#
+
+. ./common/preamble
+_begin_fstest auto quick rw
+
+_fixed_by_kernel_commit bc8aeb04fd80 \
+        "f2fs: fix to drop all discards after creating snapshot on lvm device"
+
+_require_scratch_nolvm
+_require_block_device $SCRATCH_DEV
+_require_command "$LVM_PROG" lvm
+
+lvname=lv_$seq
+vgname=vg_$seq
+testfile=$SCRATCH_MNT/testfile
+
+_cleanup()
+{
+	$LVM_PROG lvremove -f /dev/mapper/$lvname-snapshot $vgname >>$seqres.full 2>&1
+	$LVM_PROG lvremove -f /dev/mapper/$vgname-$lvname >>$seqres.full 2>&1
+	$LVM_PROG vgremove -f $vgname >>$seqres.full 2>&1
+	$LVM_PROG pvremove -f $SCRATCH_DEV >>$seqres.full 2>&1
+}
+
+$LVM_PROG pvcreate -f $SCRATCH_DEV >>$seqres.full 2>&1
+$LVM_PROG vgcreate -f $vgname $SCRATCH_DEV >>$seqres.full 2>&1
+$LVM_PROG lvcreate -L 1024m -n $lvname $vgname >>$seqres.full 2>&1
+
+$MKFS_F2FS_PROG /dev/mapper/$vgname-$lvname >>$seqres.full 2>&1
+mount -o discard /dev/mapper/$vgname-$lvname $SCRATCH_MNT >>$seqres.full 2>&1
+
+dd if=/dev/zero of=$testfile bs=1M count=20 >>$seqres.full 2>&1
+sync
+rm $testfile
+sync
+
+# create a snapshot on lvm device
+$LVM_PROG lvcreate -L 1024m -s -n $lvname-snapshot /dev/mapper/$vgname-$lvname >>$seqres.full 2>&1
+umount $SCRATCH_MNT
+
+echo "Silence is golden"
+
+status=0
+exit
diff --git a/tests/f2fs/008.out b/tests/f2fs/008.out
new file mode 100644
index 00000000..dd68d5a4
--- /dev/null
+++ b/tests/f2fs/008.out
@@ -0,0 +1,2 @@
+QA output created by 008
+Silence is golden
-- 
2.40.1