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   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 */