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Akinobu Mita6ff1cb32006-12-08 02:39:43 -08001#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;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -080020 u32 task_filter;
Akinobu Mita329409a2006-12-08 02:39:48 -080021 unsigned long stacktrace_depth;
22 unsigned long require_start;
23 unsigned long require_end;
24 unsigned long reject_start;
25 unsigned long reject_end;
Akinobu Mita6ff1cb32006-12-08 02:39:43 -080026
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;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -080039 struct dentry *task_filter_file;
Akinobu Mita329409a2006-12-08 02:39:48 -080040 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;
Akinobu Mita6ff1cb32006-12-08 02:39:43 -080045 } dentries;
46
47#endif
48};
49
50#define FAULT_ATTR_INITIALIZER { \
51 .interval = 1, \
52 .times = ATOMIC_INIT(1), \
Akinobu Mita329409a2006-12-08 02:39:48 -080053 .require_end = ULONG_MAX, \
54 .stacktrace_depth = 32, \
Don Mullis6b1b60f2006-12-08 02:39:53 -080055 .verbose = 2, \
Akinobu Mita6ff1cb32006-12-08 02:39:43 -080056 }
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);
Don Mullis08b3df22006-12-08 02:39:51 -080061bool should_fail(struct fault_attr *attr, ssize_t size);
Akinobu Mita6ff1cb32006-12-08 02:39:43 -080062
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
Akinobu Mita773ff602008-12-23 19:37:01 +090084#ifdef CONFIG_FAILSLAB
85extern bool should_failslab(size_t size, gfp_t gfpflags);
86#else
87static inline bool should_failslab(size_t size, gfp_t gfpflags)
88{
89 return false;
90}
91#endif /* CONFIG_FAILSLAB */
92
Akinobu Mita6ff1cb32006-12-08 02:39:43 -080093#endif /* _LINUX_FAULT_INJECT_H */