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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
f0dbdefb HD |
3 | * wrapper/genhd.h |
4 | * | |
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. | |
8 | * | |
9 | * Copyright (C) 2011-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
f0dbdefb HD |
10 | */ |
11 | ||
9f36eaed MJ |
12 | #ifndef _LTTNG_WRAPPER_GENHD_H |
13 | #define _LTTNG_WRAPPER_GENHD_H | |
14 | ||
f0dbdefb HD |
15 | #include <linux/genhd.h> |
16 | ||
a88ee460 MJ |
17 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,17,0)) |
18 | #define LTTNG_GENHD_FL_HIDDEN GENHD_FL_HIDDEN | |
19 | #else | |
20 | #define LTTNG_GENHD_FL_HIDDEN GENHD_FL_SUPPRESS_PARTITION_INFO | |
21 | #endif | |
22 | ||
ff04d185 | 23 | #ifdef CONFIG_KALLSYMS_ALL |
f0dbdefb HD |
24 | |
25 | #include <linux/kallsyms.h> | |
5a2f5e92 | 26 | #include <wrapper/kallsyms.h> |
f0dbdefb | 27 | |
f0dbdefb HD |
28 | static inline |
29 | struct class *wrapper_get_block_class(void) | |
30 | { | |
31 | struct class *ptr_block_class; | |
32 | ||
33 | ptr_block_class = (struct class *) kallsyms_lookup_dataptr("block_class"); | |
34 | if (!ptr_block_class) { | |
e36de50d | 35 | printk_once(KERN_WARNING "LTTng: block_class symbol lookup failed.\n"); |
f0dbdefb HD |
36 | return NULL; |
37 | } | |
38 | return ptr_block_class; | |
39 | } | |
40 | ||
3dfec228 MJ |
41 | /* |
42 | * Canary function to check for 'block_class' at compile time. | |
43 | * | |
44 | * From 'include/linux/genhd.h': | |
45 | * | |
46 | * extern struct class block_class; | |
47 | */ | |
48 | static inline | |
49 | struct class *__canary__get_block_class(void) | |
50 | { | |
51 | return &block_class; | |
52 | } | |
53 | ||
f0dbdefb HD |
54 | static inline |
55 | struct device_type *wrapper_get_disk_type(void) | |
56 | { | |
57 | struct device_type *ptr_disk_type; | |
58 | ||
59 | ptr_disk_type = (struct device_type *) kallsyms_lookup_dataptr("disk_type"); | |
60 | if (!ptr_disk_type) { | |
e36de50d | 61 | printk_once(KERN_WARNING "LTTng: disk_type symbol lookup failed.\n"); |
f0dbdefb HD |
62 | return NULL; |
63 | } | |
64 | return ptr_disk_type; | |
65 | } | |
66 | ||
3dfec228 MJ |
67 | /* |
68 | * No canary for 'disk_type', it's only defined in 'block/genhd.c'. | |
69 | * | |
70 | * static inline | |
71 | * struct device_type *__canary__get_disk_type(void) | |
72 | * { | |
73 | * return &disk_type; | |
74 | * } | |
75 | */ | |
76 | ||
f0dbdefb HD |
77 | #else |
78 | ||
79 | static inline | |
80 | struct class *wrapper_get_block_class(void) | |
81 | { | |
82 | /* | |
83 | * Symbol block_class is not exported. | |
84 | * TODO: return &block_class; | |
85 | */ | |
86 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
87 | return NULL; | |
88 | } | |
89 | ||
90 | static inline | |
91 | struct device_type *wrapper_get_disk_type(void) | |
92 | { | |
93 | /* | |
94 | * Symbol disk_type is not exported. | |
95 | * TODO: return &disk_type; | |
96 | */ | |
97 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | #endif | |
102 | ||
103 | #endif /* _LTTNG_WRAPPER_GENHD_H */ |