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 */