projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 17 | #ifdef CONFIG_KALLSYMS | |
| 18 | ||
| 19 | #include <linux/kallsyms.h> | |
| 5a2f5e92 | 20 | #include <wrapper/kallsyms.h> |
| f0dbdefb HD |
21 | |
| 22 | static inline | |
| 23 | char *wrapper_disk_name(struct gendisk *hd, int partno, char *buf) | |
| 24 | { | |
| 25 | char *(*disk_name_sym)(struct gendisk *hd, int partno, char *buf); | |
| 26 | ||
| 27 | disk_name_sym = (void *) kallsyms_lookup_funcptr("disk_name"); | |
| 28 | if (disk_name_sym) { | |
| 29 | return disk_name_sym(hd, partno, buf); | |
| 30 | } else { | |
| e36de50d | 31 | printk_once(KERN_WARNING "LTTng: disk_name symbol lookup failed.\n"); |
| f0dbdefb HD |
32 | return NULL; |
| 33 | } | |
| 34 | } | |
| 35 | ||
| 36 | #else | |
| 37 | ||
| 38 | static inline | |
| 39 | char *wrapper_disk_name(struct gendisk *hd, int partno, char *buf) | |
| 40 | { | |
| 41 | return disk_name(hd, partno, buf); | |
| 42 | } | |
| 43 | ||
| 44 | #endif | |
| 45 | ||
| 46 | #ifdef CONFIG_KALLSYMS_ALL | |
| 47 | ||
| 48 | static inline | |
| 49 | struct class *wrapper_get_block_class(void) | |
| 50 | { | |
| 51 | struct class *ptr_block_class; | |
| 52 | ||
| 53 | ptr_block_class = (struct class *) kallsyms_lookup_dataptr("block_class"); | |
| 54 | if (!ptr_block_class) { | |
| e36de50d | 55 | printk_once(KERN_WARNING "LTTng: block_class symbol lookup failed.\n"); |
| f0dbdefb HD |
56 | return NULL; |
| 57 | } | |
| 58 | return ptr_block_class; | |
| 59 | } | |
| 60 | ||
| 61 | static inline | |
| 62 | struct device_type *wrapper_get_disk_type(void) | |
| 63 | { | |
| 64 | struct device_type *ptr_disk_type; | |
| 65 | ||
| 66 | ptr_disk_type = (struct device_type *) kallsyms_lookup_dataptr("disk_type"); | |
| 67 | if (!ptr_disk_type) { | |
| e36de50d | 68 | printk_once(KERN_WARNING "LTTng: disk_type symbol lookup failed.\n"); |
| f0dbdefb HD |
69 | return NULL; |
| 70 | } | |
| 71 | return ptr_disk_type; | |
| 72 | } | |
| 73 | ||
| 74 | #else | |
| 75 | ||
| 76 | static inline | |
| 77 | struct class *wrapper_get_block_class(void) | |
| 78 | { | |
| 79 | /* | |
| 80 | * Symbol block_class is not exported. | |
| 81 | * TODO: return &block_class; | |
| 82 | */ | |
| 83 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
| 84 | return NULL; | |
| 85 | } | |
| 86 | ||
| 87 | static inline | |
| 88 | struct device_type *wrapper_get_disk_type(void) | |
| 89 | { | |
| 90 | /* | |
| 91 | * Symbol disk_type is not exported. | |
| 92 | * TODO: return &disk_type; | |
| 93 | */ | |
| 94 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
| 95 | return NULL; | |
| 96 | } | |
| 97 | ||
| 98 | #endif | |
| 99 | ||
| 100 | #endif /* _LTTNG_WRAPPER_GENHD_H */ |