#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Google, Inc.  All Rights Reserved.
#
# FS QA Test ext4/032
#
# Ext4 online resize tests of small and crucial resizes with bigalloc
# feature.
#
. ./common/preamble
_begin_fstest auto quick ioctl resize

BLK_SIZ=4096
CLUSTER_SIZ=4096

IMG_FILE=$SCRATCH_MNT/$seq.fs
IMG_MNT=$SCRATCH_MNT/$seq.mnt

## Num clusters to blocks.
c2b()
{
	local clusters=$1
	echo $(($clusters * $CLUSTER_SIZ / $BLK_SIZ))
}

ext4_online_resize()
{
	## sizes are in number of blocks.
	local original_size=$1
	local final_size=$2
	local check_if_supported=${3:-0}

	## Start with a clean image file.
	echo "" > ${IMG_FILE}
	echo "+++ truncate image file to $final_size" | \
		tee -a $seqres.full
	$XFS_IO_PROG -f -c "truncate $(($final_size * $BLK_SIZ))" ${IMG_FILE}
	LOOP_DEVICE=`_create_loop_device $IMG_FILE`

	echo "+++ create fs on image file $original_size" | \
		tee -a $seqres.full

	${MKFS_PROG} -t ${FSTYP} -F -O bigalloc,resize_inode -C $CLUSTER_SIZ \
		-b $BLK_SIZ ${LOOP_DEVICE} $original_size >> \
		$seqres.full 2>&1 || _fail "mkfs failed"

	echo "+++ mount image file" | tee -a $seqres.full
	$MOUNT_PROG -t ${FSTYP} ${LOOP_DEVICE} ${IMG_MNT} > \
		/dev/null 2>&1 || _fail "mount failed"

	echo "+++ resize fs to $final_size" | tee -a $seqres.full

	$RESIZE2FS_PROG -f ${LOOP_DEVICE} $final_size >$tmp.resize2fs 2>&1
	if [ $? -ne 0 ]; then
		if [ $check_if_supported -eq 1 ]; then
			grep -iq "operation not supported" $tmp.resize2fs \
				&& _notrun "online resizing not supported with bigalloc"
		fi
		_fail "resize failed"
	fi
	cat $tmp.resize2fs >> $seqres.full
	echo "+++ umount fs" | tee -a $seqres.full
	$UMOUNT_PROG ${IMG_MNT}

	echo "+++ check fs" | tee -a $seqres.full
	_check_generic_filesystem $LOOP_DEVICE >> $seqres.full 2>&1 || \
		_fail "fsck should not fail"
	_destroy_loop_device $LOOP_DEVICE && LOOP_DEVICE=
}

# Override the default cleanup function.
_cleanup()
{
	cd /
	[ -n "$LOOP_DEVICE" ] && _destroy_loop_device $LOOP_DEVICE > /dev/null 2>&1
	rm -f $tmp.*
	$UMOUNT_PROG ${IMG_MNT} > /dev/null 2>&1
	rm -f ${IMG_FILE} > /dev/null 2>&1
}

# get standard environment and checks

# real QA test starts here
_supported_fs ext4

_require_loop
_require_scratch
# We use resize_inode to make sure that block group descriptor table
# can be extended.
_require_scratch_ext4_feature "bigalloc,resize_inode"
_require_command "$RESIZE2FS_PROG" resize2fs

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

mkdir -p $IMG_MNT || _fail "cannot create loopback mount point"

# Check if online resizing with bigalloc is supported by the kernel
ext4_online_resize 4096 8192 1

## We perform resizing to various multiples of block group sizes to
## ensure that we cover maximum edge cases in the kernel code.
for CLUSTER_SIZ in 4096 16384 65536; do
	echo "++ set cluster size to $CLUSTER_SIZ" | tee -a $seqres.full

	##
	## Extend last group tests
	##

	## Extending a 1/2 block group to a 2/3 block group.
	ext4_online_resize $(c2b 16384) $(c2b 24576)
	## Extending a 2/3rd block group to one cluster less than a
	## full block group.
	ext4_online_resize $(c2b 24576) $(c2b 32767)
	## Extending a 2/3rd block group to a full block group.
	ext4_online_resize $(c2b 24576) $(c2b 32768)

	##
	## Extend last group and add more block groups.
	##

	## Extending a 2/3rd block group to 2 block groups.
	ext4_online_resize $(c2b 24576) $(c2b 65536)
	## Extending a 2/3rd block group to 15 block groups and one
	## cluster.
	ext4_online_resize $(c2b 24576) $(c2b 491521)
	## Extending a 2/3rd block group to 15 and a half block groups.
	ext4_online_resize $(c2b 24576) $(c2b 507904)
	## Extending a 2/3rd block group to 16 block groups.
	ext4_online_resize $(c2b 24576) $(c2b 524288)
	## Extending a 2/3rd block group to 160 block groups.
	ext4_online_resize $(c2b 24576) $(c2b 5242880)

	##
	## Convert to meta_bg.
	##

	## Extending a 2/3rd block group to 1280 block groups.
	ext4_online_resize $(c2b 24576) $(c2b 41943040)
done

status=0
exit