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
19 #include <linux/kallsyms.h>
20 #include <wrapper/kallsyms.h>
23 char *wrapper_disk_name(struct gendisk
*hd
, int partno
, char *buf
)
25 char *(*disk_name_sym
)(struct gendisk
*hd
, int partno
, char *buf
);
27 disk_name_sym
= (void *) kallsyms_lookup_funcptr("disk_name");
29 return disk_name_sym(hd
, partno
, buf
);
31 printk_once(KERN_WARNING
"LTTng: disk_name symbol lookup failed.\n");
39 char *wrapper_disk_name(struct gendisk
*hd
, int partno
, char *buf
)
41 return disk_name(hd
, partno
, buf
);
46 #ifdef CONFIG_KALLSYMS_ALL
49 struct class *wrapper_get_block_class(void)
51 struct class *ptr_block_class
;
53 ptr_block_class
= (struct class *) kallsyms_lookup_dataptr("block_class");
54 if (!ptr_block_class
) {
55 printk_once(KERN_WARNING
"LTTng: block_class symbol lookup failed.\n");
58 return ptr_block_class
;
62 struct device_type
*wrapper_get_disk_type(void)
64 struct device_type
*ptr_disk_type
;
66 ptr_disk_type
= (struct device_type
*) kallsyms_lookup_dataptr("disk_type");
68 printk_once(KERN_WARNING
"LTTng: disk_type symbol lookup failed.\n");
77 struct class *wrapper_get_block_class(void)
80 * Symbol block_class is not exported.
81 * TODO: return &block_class;
83 /* Feature currently unavailable without KALLSYMS_ALL */
88 struct device_type
*wrapper_get_disk_type(void)
91 * Symbol disk_type is not exported.
92 * TODO: return &disk_type;
94 /* Feature currently unavailable without KALLSYMS_ALL */
100 #endif /* _LTTNG_WRAPPER_GENHD_H */
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