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 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,18,0) \
16 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
17 #include <linux/blkdev.h>
19 #include <linux/genhd.h>
22 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,17,0) \
23 || LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0))
24 #define LTTNG_GENHD_FL_HIDDEN GENHD_FL_HIDDEN
26 #define LTTNG_GENHD_FL_HIDDEN GENHD_FL_SUPPRESS_PARTITION_INFO
29 #ifdef CONFIG_KALLSYMS_ALL
31 #include <linux/kallsyms.h>
32 #include <wrapper/kallsyms.h>
35 struct class *wrapper_get_block_class(void)
37 struct class *ptr_block_class
;
39 ptr_block_class
= (struct class *) kallsyms_lookup_dataptr("block_class");
40 if (!ptr_block_class
) {
41 printk_once(KERN_WARNING
"LTTng: block_class symbol lookup failed.\n");
44 return ptr_block_class
;
48 * Canary function to check for 'block_class' at compile time.
50 * From 'include/linux/genhd.h':
52 * extern struct class block_class;
55 struct class *__canary__get_block_class(void)
61 struct device_type
*wrapper_get_disk_type(void)
63 struct device_type
*ptr_disk_type
;
65 ptr_disk_type
= (struct device_type
*) kallsyms_lookup_dataptr("disk_type");
67 printk_once(KERN_WARNING
"LTTng: disk_type symbol lookup failed.\n");
74 * No canary for 'disk_type', it's only defined in 'block/genhd.c'.
77 * struct device_type *__canary__get_disk_type(void)
86 struct class *wrapper_get_block_class(void)
89 * Symbol block_class is not exported.
90 * TODO: return &block_class;
92 /* Feature currently unavailable without KALLSYMS_ALL */
97 struct device_type
*wrapper_get_disk_type(void)
100 * Symbol disk_type is not exported.
101 * TODO: return &disk_type;
103 /* Feature currently unavailable without KALLSYMS_ALL */
109 #endif /* _LTTNG_WRAPPER_GENHD_H */
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