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 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  30         struct dentry *dir;
  31 #endif
  32 };
  33
  34 #define FAULT_ATTR_INITIALIZER {                                \
  35                 .interval = 1,                                  \
  36                 .times = ATOMIC_INIT(1),                        \
  37                 .require_end = ULONG_MAX,                       \
  38                 .stacktrace_depth = 32,                         \
  39                 .verbose = 2,                                   \
  40         }
  41
  42 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
  43 int setup_fault_attr(struct fault_attr *attr, char *str);
  44 bool should_fail(struct fault_attr *attr, ssize_t size);
  45
  46 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  47
  48 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
  49 void cleanup_fault_attr_dentries(struct fault_attr *attr);
  50
  51 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  52
  53 static inline int init_fault_attr_dentries(struct fault_attr *attr,
  54                                           const char *name)
  55 {
  56         return -ENODEV;
  57 }
  58
  59 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
  60 {
  61 }
  62
  63 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  64
  65 #endif /* CONFIG_FAULT_INJECTION */
  66
  67 #ifdef CONFIG_FAILSLAB
  68 extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
  69 #else
  70 static inline bool should_failslab(size_t size, gfp_t gfpflags,
  71                                 unsigned long flags)
  72 {
  73         return false;
  74 }
  75 #endif /* CONFIG_FAILSLAB */
  76
  77 #endif /* _LINUX_FAULT_INJECT_H */