4df4902bc8d89a6335525ef050e7b0ba995d3fb4
[linux-2.6.git] / include / linux / fault-inject.h
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  */
14 struct fault_attr {
15         unsigned long probability;
16         unsigned long interval;
17         atomic_t times;
18         atomic_t space;
19         unsigned long verbose;
20
21         unsigned long count;
22
23 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
24
25         struct {
26                 struct dentry *dir;
27
28                 struct dentry *probability_file;
29                 struct dentry *interval_file;
30                 struct dentry *times_file;
31                 struct dentry *space_file;
32                 struct dentry *verbose_file;
33         } dentries;
34
35 #endif
36 };
37
38 #define FAULT_ATTR_INITIALIZER {                                \
39                 .interval = 1,                                  \
40                 .times = ATOMIC_INIT(1),                        \
41         }
42
43 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
44 int setup_fault_attr(struct fault_attr *attr, char *str);
45 void should_fail_srandom(unsigned long entropy);
46 int should_fail(struct fault_attr *attr, ssize_t size);
47
48 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
49
50 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
51 void cleanup_fault_attr_dentries(struct fault_attr *attr);
52
53 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
54
55 static inline int init_fault_attr_dentries(struct fault_attr *attr,
56                                           const char *name)
57 {
58         return -ENODEV;
59 }
60
61 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
62 {
63 }
64
65 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
66
67 #endif /* CONFIG_FAULT_INJECTION */
68
69 #endif /* _LINUX_FAULT_INJECT_H */