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