1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
5 * wrapper around block layer functions and data structures. Using
6 * KALLSYMS to get its address when available, else we need to have a
7 * kernel that exports this function to GPL modules.
9 * Copyright (C) 2011-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 #ifndef _LTTNG_WRAPPER_GENHD_H
13 #define _LTTNG_WRAPPER_GENHD_H
15 #include <linux/genhd.h>
17 #ifdef CONFIG_KALLSYMS_ALL
19 #include <linux/kallsyms.h>
20 #include <wrapper/kallsyms.h>
23 struct class *wrapper_get_block_class(void)
25 struct class *ptr_block_class
;
27 ptr_block_class
= (struct class *) kallsyms_lookup_dataptr("block_class");
28 if (!ptr_block_class
) {
29 printk_once(KERN_WARNING
"LTTng: block_class symbol lookup failed.\n");
32 return ptr_block_class
;
36 * Canary function to check for 'block_class' at compile time.
38 * From 'include/linux/genhd.h':
40 * extern struct class block_class;
43 struct class *__canary__get_block_class(void)
49 struct device_type
*wrapper_get_disk_type(void)
51 struct device_type
*ptr_disk_type
;
53 ptr_disk_type
= (struct device_type
*) kallsyms_lookup_dataptr("disk_type");
55 printk_once(KERN_WARNING
"LTTng: disk_type symbol lookup failed.\n");
62 * No canary for 'disk_type', it's only defined in 'block/genhd.c'.
65 * struct device_type *__canary__get_disk_type(void)
74 struct class *wrapper_get_block_class(void)
77 * Symbol block_class is not exported.
78 * TODO: return &block_class;
80 /* Feature currently unavailable without KALLSYMS_ALL */
85 struct device_type
*wrapper_get_disk_type(void)
88 * Symbol disk_type is not exported.
89 * TODO: return &disk_type;
91 /* Feature currently unavailable without KALLSYMS_ALL */
97 #endif /* _LTTNG_WRAPPER_GENHD_H */
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