7b72328cc8fe8b5496ba18e5ab2049c5dce3a28e
[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         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
59 int setup_fault_attr(struct fault_attr *attr, char *str);
60 bool should_fail(struct fault_attr *attr, ssize_t size);
61
62 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
63
64 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
65 void cleanup_fault_attr_dentries(struct fault_attr *attr);
66
67 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
68
69 static inline int init_fault_attr_dentries(struct fault_attr *attr,
70                                           const char *name)
71 {
72         return -ENODEV;
73 }
74
75 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
76 {
77 }
78
79 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
80
81 #endif /* CONFIG_FAULT_INJECTION */
82
83 #ifdef CONFIG_FAILSLAB
84 extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
85 #else
86 static inline bool should_failslab(size_t size, gfp_t gfpflags,
87                                 unsigned long flags)
88 {
89         return false;
90 }
91 #endif /* CONFIG_FAILSLAB */
92
93 #endif /* _LINUX_FAULT_INJECT_H */