linux/include/linux/fault-inject.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FAULT_INJECT_H
#define _LINUX_FAULT_INJECT_H

#ifdef CONFIG_FAULT_INJECTION

#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/configfs.h>
#include <linux/ratelimit.h>
#include <linux/atomic.h>

/*
 * For explanation of the elements of this struct, see
 * Documentation/fault-injection/fault-injection.rst
 */
struct fault_attr { … };

enum fault_flags { … };

#define FAULT_ATTR_INITIALIZER …

#define DECLARE_FAULT_ATTR(name) …
int setup_fault_attr(struct fault_attr *attr, char *str);
bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags);
bool should_fail(struct fault_attr *attr, ssize_t size);

#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

struct dentry *fault_create_debugfs_attr(const char *name,
			struct dentry *parent, struct fault_attr *attr);

#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */

static inline struct dentry *fault_create_debugfs_attr(const char *name,
			struct dentry *parent, struct fault_attr *attr)
{
	return ERR_PTR(-ENODEV);
}

#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */

#ifdef CONFIG_FAULT_INJECTION_CONFIGFS

struct fault_config { … };

void fault_config_init(struct fault_config *config, const char *name);

#else /* CONFIG_FAULT_INJECTION_CONFIGFS */

struct fault_config {
};

static inline void fault_config_init(struct fault_config *config,
			const char *name)
{
}

#endif /* CONFIG_FAULT_INJECTION_CONFIGFS */

#endif /* CONFIG_FAULT_INJECTION */

struct kmem_cache;

#ifdef CONFIG_FAIL_PAGE_ALLOC
bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
#else
static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
{
	return false;
}
#endif /* CONFIG_FAIL_PAGE_ALLOC */

#ifdef CONFIG_FAILSLAB
int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
#else
static inline int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
{
	return false;
}
#endif /* CONFIG_FAILSLAB */

#endif /* _LINUX_FAULT_INJECT_H */