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/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
*
* wrapper/blkdev.h
*
* wrapper around block layer functions and data structures. Using
* KALLSYMS to get its address when available, else we need to have a
* kernel that exports this function to GPL modules.
*
* Copyright (C) 2011-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _LTTNG_WRAPPER_BLKDEV_H
#define _LTTNG_WRAPPER_BLKDEV_H
#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,18,0) \
|| LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0) \
|| LTTNG_SLE_VERSION_CODE >= LTTNG_SLE_VERSION(150500, 0, 0))
#include <linux/blkdev.h>
#else
#include <linux/genhd.h>
#endif
#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,17,0) \
|| LTTNG_RHEL_KERNEL_RANGE(5,14,0,162,0,0, 5,15,0,0,0,0) \
|| LTTNG_SLE_VERSION_CODE >= LTTNG_SLE_VERSION(150500, 0, 0))
#define LTTNG_GENHD_FL_HIDDEN GENHD_FL_HIDDEN
#else
#define LTTNG_GENHD_FL_HIDDEN GENHD_FL_SUPPRESS_PARTITION_INFO
#endif
#ifdef CONFIG_KALLSYMS_ALL
#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
static inline
struct class *wrapper_get_block_class(void)
{
struct class *ptr_block_class;
ptr_block_class = (struct class *) kallsyms_lookup_dataptr("block_class");
if (!ptr_block_class) {
printk_once(KERN_WARNING "LTTng: block_class symbol lookup failed.\n");
return NULL;
}
return ptr_block_class;
}
/*
* Canary function to check for 'block_class' at compile time.
*
* From 'include/linux/blkdev.h':
*
* extern struct class block_class;
*/
static inline
const struct class *__canary__get_block_class(void)
{
return &block_class;
}
static inline
struct device_type *wrapper_get_disk_type(void)
{
struct device_type *ptr_disk_type;
ptr_disk_type = (struct device_type *) kallsyms_lookup_dataptr("disk_type");
if (!ptr_disk_type) {
printk_once(KERN_WARNING "LTTng: disk_type symbol lookup failed.\n");
return NULL;
}
return ptr_disk_type;
}
/*
* No canary for 'disk_type', it's only defined in 'block/genhd.c'.
*
* static inline
* struct device_type *__canary__get_disk_type(void)
* {
* return &disk_type;
* }
*/
#else
static inline
struct class *wrapper_get_block_class(void)
{
/*
* Symbol block_class is not exported.
* TODO: return &block_class;
*/
/* Feature currently unavailable without KALLSYMS_ALL */
return NULL;
}
static inline
struct device_type *wrapper_get_disk_type(void)
{
/*
* Symbol disk_type is not exported.
* TODO: return &disk_type;
*/
/* Feature currently unavailable without KALLSYMS_ALL */
return NULL;
}
#endif
#endif /* _LTTNG_WRAPPER_BLKDEV_H */
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