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 <asm/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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
30
31	struct {
32		struct dentry *dir;
33
34		struct dentry *probability_file;
35		struct dentry *interval_file;
36		struct dentry *times_file;
37		struct dentry *space_file;
38		struct dentry *verbose_file;
39		struct dentry *task_filter_file;
40		struct dentry *stacktrace_depth_file;
41		struct dentry *require_start_file;
42		struct dentry *require_end_file;
43		struct dentry *reject_start_file;
44		struct dentry *reject_end_file;
45	} dentries;
46
47#endif
48};
49
50#define FAULT_ATTR_INITIALIZER {				\
51		.interval = 1,					\
52		.times = ATOMIC_INIT(1),			\
53		.require_end = ULONG_MAX,			\
54		.stacktrace_depth = 32,				\
55		.verbose = 2,					\
56	}
57
58#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
59int setup_fault_attr(struct fault_attr *attr, char *str);
60void should_fail_srandom(unsigned long entropy);
61bool should_fail(struct fault_attr *attr, ssize_t size);
62
63#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
64
65int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
66void cleanup_fault_attr_dentries(struct fault_attr *attr);
67
68#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
69
70static inline int init_fault_attr_dentries(struct fault_attr *attr,
71					  const char *name)
72{
73	return -ENODEV;
74}
75
76static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
77{
78}
79
80#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
81
82#endif /* CONFIG_FAULT_INJECTION */
83
84#endif /* _LINUX_FAULT_INJECT_H */
85