linux-ext4 - [PATCH 2/2] ext4: Test to ensure resize with sparse

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Date:   Mon,  7 Feb 2022 13:55:34 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Cc:     Ojaswin Mujoo <ojaswin@...ux.ibm.com>, riteshh@...ux.ibm.com
Subject: [PATCH 2/2] ext4: Test to ensure resize with sparse_super2 is handled correctly

Kernel currently doesn't support resize of EXT4 mounted
with sparse_super2 option enabled. Earlier, it used to leave the resize
incomplete and the fs would be left in an inconsistent state, however commit
b1489186cc83[1] fixed this to avoid the fs corruption by clearly returning
-ENOTSUPP.

Test to ensure that kernel handles resizing with sparse_super2 correctly. Run
resize for multiple iterations because this leads to kernel crash due to
fs corruption, which we want to detect.

Related commit in mainline:

[1] commit b1489186cc8391e0c1e342f9fbc3eedf6b944c61

	ext4: add check to prevent attempting to resize an fs with sparse_super2

Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
---
 tests/ext4/056     | 102 +++++++++++++++++++++++++++++++++++++++++++++
 tests/ext4/056.out |   2 +
 2 files changed, 104 insertions(+)
 create mode 100755 tests/ext4/056
 create mode 100644 tests/ext4/056.out

diff --git a/tests/ext4/056 b/tests/ext4/056
new file mode 100755
index 00000000..9185621d
--- /dev/null
+++ b/tests/ext4/056
@@ -0,0 +1,102 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 IBM. All Rights Reserved.
+#
+# We don't currently support resize of EXT4 filesystems mounted
+# with sparse_super2 option enabled. Earlier, kernel used to leave the resize
+# incomplete and the fs would be left into an incomplete state, however commit
+# b1489186cc83 fixed this to avoid the fs corruption by clearly returning
+# -ENOTSUPP.
+#
+# This test ensures that kernel handles resizing with sparse_super2 correctly
+#
+# Related commit in mainline:
+#
+# commit b1489186cc8391e0c1e342f9fbc3eedf6b944c61
+# ext4: add check to prevent attempting to resize an fs with sparse_super2
+#
+
+. ./common/preamble
+_begin_fstest auto ioctl resize quick
+
+# real QA test starts here
+
+INITIAL_FS_SIZE=1G
+RESIZED_FS_SIZE=$((2*1024*1024*1024))  # 2G
+ONLINE_RESIZE_BLOCK_LIMIT=$((256*1024*1024))
+
+_supported_fs ext4
+_require_scratch_size $(($RESIZED_FS_SIZE/1024))
+_require_test_program "ext4_resize"
+
+_log()
+{
+	echo "$seq: $*" >> $seqres.full 2>&1
+}
+
+do_resize()
+{
+
+	$MKFS_PROG `_scratch_mkfs_options -t ext4 -E resize=$ONLINE_RESIZE_BLOCK_LIMIT \
+		-O sparse_super2` $INITIAL_FS_SIZE >> $seqres.full 2>&1 \
+		|| _fail "$MKFS_PROG failed. Exiting"
+
+	_scratch_mount || _fail "Failed to mount scratch partition. Exiting"
+
+	BS=$(_get_block_size $SCRATCH_MNT)
+	NEW_BLOCKS=$(($RESIZED_FS_SIZE/$BS))
+
+	local RESIZE_RET
+	local EOPNOTSUPP=95
+
+	$here/src/ext4_resize $SCRATCH_MNT $NEW_BLOCKS >> $seqres.full 2>&1
+	RESIZE_RET=$?
+
+	# Use $RESIZE_RET for logging
+	if [ $RESIZE_RET = 0 ]
+	then
+		_log "Resizing succeeded but FS might still be corrupt."
+	elif [ $RESIZE_RET = $EOPNOTSUPP ]
+	then
+		_log "Resize operation not supported with sparse_super2"
+		_log "Threw expected error $RESIZE_RET (EOPNOTSUPP)"
+
+	else
+		_log "Output of resize = $RESIZE_RET. Expected $EOPNOTSUPP (EOPNOTSUPP)"
+		_log "You might be missing kernel patch b1489186cc83"
+	fi
+
+	# unount after ioctl sometimes fails with "device busy" so add a small delay
+	sleep 0.1
+
+	_scratch_unmount >> $seqres.full 2>&1 || _fail "$UMOUNT_PROG failed. Exiting"
+}
+
+run_test()
+{
+	local FSCK_RET
+	local ITERS=8
+
+	for i in $(seq 1 $ITERS)
+	do
+		_log "----------- Iteration: $i ------------"
+		do_resize
+	done
+
+	_log "-------- Iterations Complete ---------"
+	_log "Checking if FS is in consistent state"
+	_check_scratch_fs
+	FSCK_RET=$?
+
+	return $FSCK_RET
+}
+
+run_test
+status=$?
+
+if [ "$status" -eq "0" ]
+then
+	echo "Test Succeeded!" | tee -a $seqres.full
+fi
+
+exit
diff --git a/tests/ext4/056.out b/tests/ext4/056.out
new file mode 100644
index 00000000..41706284
--- /dev/null
+++ b/tests/ext4/056.out
@@ -0,0 +1,2 @@
+QA output created by 056
+Test Succeeded!
-- 
2.27.0