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
  22         unsigned long count;
  23
  24 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  25
  26         struct {
  27                 struct dentry *dir;
  28
  29                 struct dentry *probability_file;
  30                 struct dentry *interval_file;
  31                 struct dentry *times_file;
  32                 struct dentry *space_file;
  33                 struct dentry *verbose_file;
  34                 struct dentry *task_filter_file;
  35         } dentries;
  36
  37 #endif
  38 };
  39
  40 #define FAULT_ATTR_INITIALIZER {                                \
  41                 .interval = 1,                                  \
  42                 .times = ATOMIC_INIT(1),                        \
  43         }
  44
  45 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
  46 int setup_fault_attr(struct fault_attr *attr, char *str);
  47 void should_fail_srandom(unsigned long entropy);
  48 int should_fail(struct fault_attr *attr, ssize_t size);
  49
  50 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  51
  52 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
  53 void cleanup_fault_attr_dentries(struct fault_attr *attr);
  54
  55 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  56
  57 static inline int init_fault_attr_dentries(struct fault_attr *attr,
  58                                           const char *name)
  59 {
  60         return -ENODEV;
  61 }
  62
  63 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
  64 {
  65 }
  66
  67 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  68
  69 #endif /* CONFIG_FAULT_INJECTION */
  70
  71 #endif /* _LINUX_FAULT_INJECT_H */