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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FAULT_INJECT_H
#define _LINUX_FAULT_INJECT_H
#include <linux/err.h>
#include <linux/types.h>
struct dentry;
struct kmem_cache;
#ifdef CONFIG_FAULT_INJECTION
#include <linux/atomic.h>
#include <linux/configfs.h>
#include <linux/ratelimit.h>
/*
* For explanation of the elements of this struct, see
* Documentation/fault-injection/fault-injection.rst
*/
struct fault_attr {
unsigned long probability;
unsigned long interval;
atomic_t times;
atomic_t space;
unsigned long verbose;
bool task_filter;
unsigned long stacktrace_depth;
unsigned long require_start;
unsigned long require_end;
unsigned long reject_start;
unsigned long reject_end;
unsigned long count;
struct ratelimit_state ratelimit_state;
struct dentry *dname;
};
enum fault_flags {
FAULT_NOWARN = 1 << 0,
};
#define FAULT_ATTR_INITIALIZER { \
.interval = 1, \
.times = ATOMIC_INIT(1), \
.require_end = ULONG_MAX, \
.stacktrace_depth = 32, \
.ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
.verbose = 2, \
.dname = NULL, \
}
#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
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);
#else /* CONFIG_FAULT_INJECTION */
struct fault_attr {
};
#define DECLARE_FAULT_ATTR(name) struct fault_attr name = {}
static inline int setup_fault_attr(struct fault_attr *attr, char *str)
{
return 0; /* Note: 0 means error for __setup() handlers! */
}
static inline bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags)
{
return false;
}
static inline bool should_fail(struct fault_attr *attr, ssize_t size)
{
return false;
}
#endif /* CONFIG_FAULT_INJECTION */
#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 {
struct fault_attr attr;
struct config_group group;
};
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 */
#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 */
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