#!/bin/bash
#
# Copyright(c) 2012-2022 Intel Corporation
# Copyright(c) 2024 Huawei Technologies
# SPDX-License-Identifier: BSD-3-Clause
#

. $(dirname $3)/conf_framework.sh


check() {
	cur_name=$(basename $2)
	config_file_path=$1
	if compile_module $cur_name "blkdev_get_by_path(NULL, 0, NULL);" "linux/blkdev.h"
	then
		echo $cur_name 1 >> $config_file_path
	elif compile_module $cur_name "blkdev_get_by_path(NULL, 0, NULL, NULL);blkdev_put(NULL, FMODE_READ);" "linux/blkdev.h"
	then
		echo $cur_name 2 >> $config_file_path
	elif compile_module $cur_name "blkdev_get_by_path(NULL, 0, NULL, NULL);blkdev_put(NULL, NULL);" "linux/blkdev.h"
	then
		echo $cur_name 3 >> $config_file_path
	elif compile_module $cur_name "bdev_open_by_path(NULL, 0, NULL, NULL);" "linux/blkdev.h"
	then
		echo $cur_name 4 >> $config_file_path
	elif compile_module $cur_name "bdev_file_open_by_path(NULL, 0, NULL, NULL);" "linux/blkdev.h"
	then
		echo $cur_name 5 >> $config_file_path
	else
		echo $cur_name X >> $config_file_path
	fi
}

apply() {
	case "$1" in
	"1")
		# Related kernel commit 0718afd47f70cf46877c39c25d06b786e1a3f36c
		add_typedef "struct block_device *cas_bdev_handle_t;"
		add_define "cas_bdev_open_by_path(path, mode, holder) \\
			blkdev_get_by_path(path, mode, holder)"
		add_define "cas_bdev_get_from_handle(handle) \\
			((struct block_device *)handle)"
		add_define "cas_bdev_release(handle, mode, holder) \\
			blkdev_put((struct block_device *)handle, mode)" ;;
	"2")
		# Before kernel commit 2736e8eeb0ccdc71d1f4256c9c9a28f58cc43307
		add_typedef "struct block_device *cas_bdev_handle_t;"
		add_define "cas_bdev_open_by_path(path, mode, holder) \\
			blkdev_get_by_path(path, mode, holder, NULL)"
		add_define "cas_bdev_get_from_handle(handle) \\
			((struct block_device *)handle)"
		add_define "cas_bdev_release(handle, mode, holder) \\
			blkdev_put((struct block_device *)handle, mode)" ;;
	"3")
		# From kernel commit 2736e8eeb0ccdc71d1f4256c9c9a28f58cc43307
		add_typedef "struct block_device *cas_bdev_handle_t;"
		add_define "cas_bdev_open_by_path(path, mode, holder) \\
			blkdev_get_by_path(path, mode, holder, NULL)"
		add_define "cas_bdev_get_from_handle(handle) \\
			((struct block_device *)handle)"
		add_define "cas_bdev_release(handle, mode, holder) \\
			blkdev_put((struct block_device *)handle, holder)" ;;
	"4")
		# From kernel commit e719b4d156749f02eafed31a3c515f2aa9dcc72a
		add_typedef "struct bdev_handle *cas_bdev_handle_t;"
		add_define "cas_bdev_open_by_path(path, mode, holder) \\
			bdev_open_by_path(path, mode, holder, NULL)"
		add_define "cas_bdev_get_from_handle(handle) \\
			(handle->bdev)"
		add_define "cas_bdev_release(handle, mode, holder) \\
			bdev_release(handle)" ;;
	"5")
		# From kernel commit e97d06a46526d9392cbdbd7eda193091e1af2723
		add_typedef "struct file *cas_bdev_handle_t;"
		add_define "cas_bdev_open_by_path(path, mode, holder) \\
			bdev_file_open_by_path(path, mode, holder, NULL)"
		add_define "cas_bdev_get_from_handle(handle) \\
			file_bdev(handle)"
		add_define "cas_bdev_release(handle, mode, holder) \\
			__fput_sync(handle)" ;;
	*)
		exit 1
	esac
}

conf_run $@