1#ifndef _LINUX_FAULT_INJECT_H
2#define _LINUX_FAULT_INJECT_H
3
4#ifdef CONFIG_FAULT_INJECTION
5
6#include <linux/types.h>
7#include <linux/debugfs.h>
8#include <linux/ratelimit.h>
9#include <linux/atomic.h>
10
11/*
12 * For explanation of the elements of this struct, see
13 * Documentation/fault-injection/fault-injection.txt
14 */
15struct fault_attr {
16	unsigned long probability;
17	unsigned long interval;
18	atomic_t times;
19	atomic_t space;
20	unsigned long verbose;
21	u32 task_filter;
22	unsigned long stacktrace_depth;
23	unsigned long require_start;
24	unsigned long require_end;
25	unsigned long reject_start;
26	unsigned long reject_end;
27
28	unsigned long count;
29	struct ratelimit_state ratelimit_state;
30	struct dentry *dname;
31};
32
33#define FAULT_ATTR_INITIALIZER {					\
34		.interval = 1,						\
35		.times = ATOMIC_INIT(1),				\
36		.require_end = ULONG_MAX,				\
37		.stacktrace_depth = 32,					\
38		.ratelimit_state = RATELIMIT_STATE_INIT_DISABLED,	\
39		.verbose = 2,						\
40		.dname = NULL,						\
41	}
42
43#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
44int setup_fault_attr(struct fault_attr *attr, char *str);
45bool should_fail(struct fault_attr *attr, ssize_t size);
46
47#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
48
49struct dentry *fault_create_debugfs_attr(const char *name,
50			struct dentry *parent, struct fault_attr *attr);
51
52#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
53
54static inline struct dentry *fault_create_debugfs_attr(const char *name,
55			struct dentry *parent, struct fault_attr *attr)
56{
57	return ERR_PTR(-ENODEV);
58}
59
60#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
61
62#endif /* CONFIG_FAULT_INJECTION */
63
64#ifdef CONFIG_FAILSLAB
65extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
66#else
67static inline bool should_failslab(size_t size, gfp_t gfpflags,
68				unsigned long flags)
69{
70	return false;
71}
72#endif /* CONFIG_FAILSLAB */
73
74#endif /* _LINUX_FAULT_INJECT_H */
75