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[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 <linux/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
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
39 int setup_fault_attr(struct fault_attr *attr, char *str);
40 bool should_fail(struct fault_attr *attr, ssize_t size);
41
42 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
43
44 struct 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
49 static 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
60 extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
61 #else
62 static 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 */