Add support for Linux kernel up to 6.8

Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>

configure.d/1_bdev_open_by_path.conf

@@ -0,0 +1,53 @@
+#!/bin/bash
+#
+# Copyright(c) 2012-2022 Intel Corporation
+# Copyright(c) 2023-2024 Huawei Technologies Co., Ltd.
+# 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);" "linux/blkdev.h"
+	then
+		echo $cur_name 2 >> $config_file_path
+	elif compile_module $cur_name "bdev_open_by_path(NULL, 0, NULL, NULL);" "linux/blkdev.h"
+	then
+		echo $cur_name 3 >> $config_file_path
+	else
+		echo $cur_name X >> $config_file_path
+	fi
+}
+
+apply() {
+	case "$1" in
+	"1")
+		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)" ;;
+	"2")
+		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)" ;;
+	"3")
+		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)" ;;
+	*)
+		exit 1
+	esac
+}
+
+conf_run $@

configure.d/1_bdev_put.conf → configure.d/1_bdev_release.conf

@@ -17,6 +17,9 @@ check() {
 	elif compile_module $cur_name "blkdev_put(NULL, NULL);" "linux/blkdev.h"
 	then
 		echo $cur_name 2 >> $config_file_path
+	elif compile_module $cur_name "bdev_release(NULL);" "linux/blkdev.h"
+	then
+		echo $cur_name 3 >> $config_file_path
 	else
 		echo $cur_name X >> $config_file_path
 	fi
@@ -25,11 +28,14 @@ check() {
 apply() {
 	case "$1" in
 	"1")
-		add_define "cas_blkdev_put(bdev, mode, holder) \\
-		blkdev_put(bdev, mode)" ;;
+		add_define "cas_bdev_release(handle, mode, holder) \\
+			blkdev_put((struct block_device *)handle, mode)" ;;
 	"2")
-		add_define "cas_blkdev_put(bdev, mode, holder) \\
-		blkdev_put(bdev, holder)" ;;
+		add_define "cas_bdev_release(handle, mode, holder) \\
+			blkdev_put((struct block_device *)handle, holder)" ;;
+	"3")
+		add_define "cas_bdev_release(handle, mode, holder) \\
+			bdev_release(handle)" ;;
 	*)
 		exit 1
 	esac

configure.d/1_class_create.conf

@@ -0,0 +1,35 @@
+#!/bin/bash
+#
+# Copyright(c) 2012-2022 Intel Corporation
+# Copyright(c) 2023-2024 Huawei Technologies Co., Ltd.
+# 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 "class_create(NULL, NULL);" "linux/device.h"
+	then
+		echo $cur_name "1" >> $config_file_path
+	elif compile_module $cur_name "class_create(NULL);" "linux/device.h"
+	then
+		echo $cur_name "2" >> $config_file_path
+	else
+		echo $cur_name "X" >> $config_file_path
+	fi
+}
+
+apply() {
+	case "$1" in
+	"1")
+		add_define "cas_class_create(owner, name) \\
+			class_create(owner, name)";;
+	"2")
+		add_define "cas_class_create(owner, name) \\
+			class_create(name)";;
+	esac
+}
+
+conf_run $@

configure.d/2_bio_cmpl.conf

@@ -33,14 +33,14 @@ apply() {
 		add_define "CAS_BIO_ENDIO(BIO, BYTES_DONE, ERROR) \\
 			bio_endio(BIO, ERROR)"
 		add_define "CAS_DECLARE_BLOCK_CALLBACK(name, BIO, BYTES_DONE, ERROR) \\
-			void name##_callback(BIO, ERROR)"
+			static void name##_callback(BIO, ERROR)"
 		add_define "CAS_BLOCK_CALLBACK_ERROR(BIO, ERROR) \\
 			ERROR" ;;
 	"2")
 		add_define "CAS_BIO_ENDIO(BIO, BYTES_DONE, ERROR) \\
 			({ CAS_BIO_OP_STATUS(BIO) = ERROR; bio_endio(BIO); })"
 		add_define "CAS_DECLARE_BLOCK_CALLBACK(name, BIO, BYTES_DONE, ERROR) \\
-			void name##_callback(BIO)"
+			static void name##_callback(BIO)"
 		add_define "CAS_BLOCK_CALLBACK_ERROR(BIO, ERROR) \\
 			CAS_BIO_OP_STATUS(BIO)" ;;
 	esac

configure.d/conf_framework.sh

@@ -20,6 +20,10 @@ add_function() {
 	printf "%s\n" $1 >> $DEFINE_FILE
 }
 
+add_typedef() {
+	printf "typedef %s\n" $1 >> $DEFINE_FILE
+}
+
 __compile_module(){
 	INCLUDE=""
 	if [ $# -gt 1 ]

modules/cas_cache/control.c

@@ -42,7 +42,7 @@ int __init cas_ctrl_device_init(void)
 		goto error_cdev_add;
 	}
 
-	ctrl->class = class_create(THIS_MODULE, "cas");
+	ctrl->class = cas_class_create(THIS_MODULE, "cas");
 	if (IS_ERR(ctrl->class)) {
 		printk(KERN_ERR "Cannot create control chrdev class.\n");
 		result = PTR_ERR(ctrl->class);

modules/cas_cache/disk.c

@@ -14,17 +14,15 @@
 
 #define CAS_DISK_OPEN_MODE (CAS_MODE_READ | CAS_MODE_WRITE)
 
-static inline struct block_device *open_bdev_exclusive(const char *path,
+static inline cas_bdev_handle_t open_bdev_exclusive(const char *path,
 		CAS_MODE mode, void *holder)
 {
-	return cas_blkdev_get_by_path(path, mode | CAS_MODE_EXCL,
-			 holder);
+	return cas_bdev_open_by_path(path, mode | CAS_MODE_EXCL, holder);
 }
 
-static inline void close_bdev_exclusive(struct block_device *bdev,
-		CAS_MODE mode)
+static inline void close_bdev_exclusive(cas_bdev_handle_t handle, CAS_MODE mode)
 {
-	cas_blkdev_put(bdev, mode | CAS_MODE_EXCL, NULL);
+	cas_bdev_release(handle, mode | CAS_MODE_EXCL, NULL);
 }
 
 int __init cas_init_disks(void)
@@ -69,10 +67,10 @@ struct cas_disk *cas_disk_open(const char *path)
 		goto error_kstrdup;
 	}
 
-	dsk->bd = open_bdev_exclusive(path, CAS_DISK_OPEN_MODE, dsk);
-	if (IS_ERR(dsk->bd)) {
+	dsk->bdev_handle = open_bdev_exclusive(path, CAS_DISK_OPEN_MODE, dsk);
+	if (IS_ERR(dsk->bdev_handle)) {
 		CAS_DEBUG_ERROR("Cannot open exclusive");
-		result = PTR_ERR(dsk->bd);
+		result = PTR_ERR(dsk->bdev_handle);
 		goto error_open_bdev;
 	}
 
@@ -91,11 +89,11 @@ struct cas_disk *cas_disk_open(const char *path)
 void cas_disk_close(struct cas_disk *dsk)
 {
 	BUG_ON(!dsk);
-	BUG_ON(!dsk->bd);
+	BUG_ON(!dsk->bdev_handle);
 
 	CAS_DEBUG_DISK(dsk, "Destroying (%p)", dsk);
 
-	close_bdev_exclusive(dsk->bd, CAS_DISK_OPEN_MODE);
+	close_bdev_exclusive(dsk->bdev_handle, CAS_DISK_OPEN_MODE);
 
 	kfree(dsk->path);
 	kmem_cache_free(cas_module.disk_cache, dsk);
@@ -104,19 +102,18 @@ void cas_disk_close(struct cas_disk *dsk)
 struct block_device *cas_disk_get_blkdev(struct cas_disk *dsk)
 {
 	BUG_ON(!dsk);
-	return dsk->bd;
+	BUG_ON(!dsk->bdev_handle);
+	return cas_bdev_get_from_handle(dsk->bdev_handle);
 }
 
 struct gendisk *cas_disk_get_gendisk(struct cas_disk *dsk)
 {
-	BUG_ON(!dsk);
-	BUG_ON(!dsk->bd);
-	return dsk->bd->bd_disk;
+	return cas_disk_get_blkdev(dsk)->bd_disk;
 }
 
 struct request_queue *cas_disk_get_queue(struct cas_disk *dsk)
 {
-	BUG_ON(!dsk);
-	BUG_ON(!dsk->bd);
-	return cas_bdev_whole(dsk->bd)->bd_disk->queue;
+	struct block_device *bd = cas_disk_get_blkdev(dsk);
+
+	return cas_bdev_whole(bd)->bd_disk->queue;
 }

modules/cas_cache/disk.h

@@ -16,7 +16,7 @@ struct cas_exp_obj;
 struct cas_disk {
 	char *path;
 
-	struct block_device *bd;
+	cas_bdev_handle_t bdev_handle;
 
 	struct cas_exp_obj *exp_obj;
 };

modules/cas_cache/exp_obj.c

@@ -174,7 +174,7 @@ static int _cas_exp_obj_hide_parts(struct cas_disk *dsk)
 		/* It is partition, no more job required */
 		return 0;
 
-	if (GET_DISK_MAX_PARTS(dsk->bd->bd_disk) > 1) {
+	if (GET_DISK_MAX_PARTS(cas_disk_get_gendisk(dsk)) > 1) {
 		if (_cas_del_partitions(dsk)) {
 			printk(KERN_ERR "Error deleting a partition on thedevice %s\n",
 				gdsk->disk_name);
@@ -490,7 +490,7 @@ int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
 	if (cas_add_disk(gd))
 		goto error_add_disk;
 
-	result = bd_claim_by_disk(dsk->bd, dsk, gd);
+	result = bd_claim_by_disk(cas_disk_get_blkdev(dsk), dsk, gd);
 	if (result)
 		goto error_bd_claim;
 
@@ -531,7 +531,7 @@ int cas_exp_obj_destroy(struct cas_disk *dsk)
 
 	exp_obj = dsk->exp_obj;
 
-	bd_release_from_disk(dsk->bd, exp_obj->gd);
+	bd_release_from_disk(cas_disk_get_blkdev(dsk), exp_obj->gd);
 	_cas_exp_obj_clear_dev_t(dsk);
 	del_gendisk(exp_obj->gd);