#!/bin/bash
#
# Copyright(c) 2012-2022 Intel Corporation
# SPDX-License-Identifier: BSD-3-Clause
#

. $(dirname $3)/conf_framework

# RHEL8.5 kernel 4.18 subversion targeted for the workaround is 348.2.1.
# The workaround is needed starting this version and up.
LINUX_MAJOR_SINCE=4
LINUX_MINOR_SINCE=18
LINUX_SUB_SINCE=0
RHEL_MAJOR_SINCE=348
RHEL_MINOR_SINCE=2
RHEL_SUB_SINCE=1

check () {
	cur_name=$(basename $2)
	config_file_path=$1
	LINUX_VERSION_CODE=$(get_define $cur_name "LINUX_VERSION_CODE" "generated/uapi/linux/version.h")
	RHEL_RELEASE=$(get_define $cur_name "RHEL_RELEASE" "generated/uapi/linux/version.h")
	LINUX_MAJOR=$((LINUX_VERSION_CODE >> 16 & 0xff))
	LINUX_MINOR=$((LINUX_VERSION_CODE >> 8 & 0xff))
	LINUX_SUB=$((LINUX_VERSION_CODE & 0xff))

	if [ -z $RHEL_RELEASE ]; then
		echo $cur_name "2" >> $config_file_path; #not RHEL, no workaround needed
	else
		#it's RHEL, check versions to see if the workaround is needed

		IFS=. read -a arr <<< $RHEL_RELEASE
		RHEL_MAJOR=${arr[0]}
		RHEL_MINOR=${arr[1]}
		RHEL_SUB=${arr[2]}

		#check kernel and rhel version (major/minor/sub)
		if [ "$LINUX_MAJOR" -eq "$LINUX_MAJOR_SINCE" ] &&
		   [ "$LINUX_MINOR" -eq "$LINUX_MINOR_SINCE" ] &&
		   [ "$LINUX_SUB"   -eq "$LINUX_SUB_SINCE" ] &&
		   [ "$RHEL_MAJOR"  -ge "$RHEL_MAJOR_SINCE" ] &&
		   [ "$RHEL_MINOR"  -ge "$RHEL_MINOR_SINCE" ] &&
		   [ "$RHEL_SUB"    -ge "$RHEL_SUB_SINCE" ]
		then
			echo $cur_name "1" >> $config_file_path; #workaround needed
		else
			echo $cur_name "2" >> $config_file_path; #no workaround needed
		fi
	fi

}

apply() {
	case "$1" in
	"1")
		add_define "cas_blk_queue_exit(bvol) \
			percpu_ref_put(&(casdisk_functions.casdsk_exp_obj_get_queue(bvol->dsk)->q_usage_counter) );
		"
		;;
	"2")
		add_define "cas_blk_queue_exit(bvol) (void)bvol;"
		;;
	*)
		exit 1
	esac
}

conf_run $@