From 4bb435555f28dc19d1782828bfa08b663686a7fe Mon Sep 17 00:00:00 2001
From: Gal Hammer <gal.hammer@huawei.com>
Date: Sun, 30 Jan 2022 11:30:05 +0200
Subject: [PATCH] configure/bd_part_count: adapt to kernel 5.12

Moved cas_blk_get_part_count function to configure section after the
the disk's partitions table was changed to xarray.

Signed-off-by: Gal Hammer <gal.hammer@huawei.com>
Signed-off-by: Shai Fultheim <shai.fultheim@huawei.com>
---
 configure.d/1_bd_part_count.conf           | 61 ++++++++++++++++++++++
 modules/cas_cache/layer_cache_management.c |  1 -
 modules/cas_cache/utils/utils_blk.c        | 22 --------
 modules/cas_cache/utils/utils_blk.h        | 14 -----
 4 files changed, 61 insertions(+), 37 deletions(-)
 create mode 100644 configure.d/1_bd_part_count.conf
 delete mode 100644 modules/cas_cache/utils/utils_blk.c
 delete mode 100644 modules/cas_cache/utils/utils_blk.h

diff --git a/configure.d/1_bd_part_count.conf b/configure.d/1_bd_part_count.conf
new file mode 100644
index 0000000..0986b23
--- /dev/null
+++ b/configure.d/1_bd_part_count.conf
@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# Copyright(c) 2012-2022 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+. $(dirname $3)/conf_framework
+
+check() {
+	cur_name=$(basename $2)
+	config_file_path=$1
+	if compile_module $cur_name "struct gendisk *disk = NULL; struct xarray xa; xa = disk->part_tbl" "linux/genhd.h"
+	then
+		echo $cur_name "1" >> $config_file_path
+	elif compile_module $cur_name "struct gendisk *disk = NULL; struct disk_part_tbl *ptbl; ptbl = disk->part_tbl" "linux/genhd.h"
+	then
+		echo $cur_name "2" >> $config_file_path
+	else
+		echo $cur_name "X" >> $config_file_path
+	fi
+}
+
+apply() {
+    case "$1" in
+    "1")
+		add_function "
+	static inline int cas_blk_get_part_count(struct block_device *bdev)
+	{
+		struct block_device *part;
+		unsigned long idx;
+		int count = 0;
+
+		xa_for_each(&bdev->bd_disk->part_tbl, idx, part) {
+			count++;
+		}
+
+		return count;
+	}" ;;
+    "2")
+		add_function "
+	static inline int cas_blk_get_part_count(struct block_device *bdev)
+	{
+		struct disk_part_tbl *ptbl;
+		int i, count = 0;
+
+		rcu_read_lock();
+		ptbl = rcu_dereference(bdev->bd_disk->part_tbl);
+		for (i = 0; i < ptbl->len; ++i) {
+			if (rcu_access_pointer(ptbl->part[i]))
+				count++;
+		}
+		rcu_read_unlock();
+
+		return count;
+	}" ;;
+    *)
+        exit 1
+    esac
+}
+
+conf_run $@
diff --git a/modules/cas_cache/layer_cache_management.c b/modules/cas_cache/layer_cache_management.c
index 4907a49..6f4252d 100644
--- a/modules/cas_cache/layer_cache_management.c
+++ b/modules/cas_cache/layer_cache_management.c
@@ -4,7 +4,6 @@
 */
 
 #include "cas_cache.h"
-#include "utils/utils_blk.h"
 #include "threads.h"
 
 extern u32 max_writeback_queue_size;
diff --git a/modules/cas_cache/utils/utils_blk.c b/modules/cas_cache/utils/utils_blk.c
deleted file mode 100644
index 2286bf3..0000000
--- a/modules/cas_cache/utils/utils_blk.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
-* Copyright(c) 2012-2021 Intel Corporation
-* SPDX-License-Identifier: BSD-3-Clause
-*/
-
-#include "utils_blk.h"
-
-int cas_blk_get_part_count(struct block_device *bdev)
-{
-	struct disk_part_tbl *ptbl;
-	int i, count = 0;
-
-	rcu_read_lock();
-	ptbl = rcu_dereference(bdev->bd_disk->part_tbl);
-	for (i = 0; i < ptbl->len; ++i) {
-		if (rcu_access_pointer(ptbl->part[i]))
-			count++;
-	}
-	rcu_read_unlock();
-
-	return count;
-}
diff --git a/modules/cas_cache/utils/utils_blk.h b/modules/cas_cache/utils/utils_blk.h
deleted file mode 100644
index 9a3946f..0000000
--- a/modules/cas_cache/utils/utils_blk.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
-* Copyright(c) 2012-2021 Intel Corporation
-* SPDX-License-Identifier: BSD-3-Clause
-*/
-
-#ifndef UTILS_BLK_H_
-#define UTILS_BLK_H_
-
-#include <linux/fs.h>
-#include <linux/genhd.h>
-
-int cas_blk_get_part_count(struct block_device *bdev);
-
-#endif /* UTILS_BLK_H_ */