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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         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
  31         struct {
  32                 struct dentry *dir;
  33
  34                 struct dentry *probability_file;
  35                 struct dentry *interval_file;
  36                 struct dentry *times_file;
  37                 struct dentry *space_file;
  38                 struct dentry *verbose_file;
  39                 struct dentry *task_filter_file;
  40                 struct dentry *stacktrace_depth_file;
  41                 struct dentry *require_start_file;
  42                 struct dentry *require_end_file;
  43                 struct dentry *reject_start_file;
  44                 struct dentry *reject_end_file;
  45         } dentries;
  46
  47 #endif
  48 };
  49
  50 #define FAULT_ATTR_INITIALIZER {                                \
  51                 .interval = 1,                                  \
  52                 .times = ATOMIC_INIT(1),                        \
  53                 .require_end = ULONG_MAX,                       \
  54                 .stacktrace_depth = 32,                         \
  55                 .verbose = 2,                                   \
  56         }
  57
  58 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
  59 int setup_fault_attr(struct fault_attr *attr, char *str);
  60 void should_fail_srandom(unsigned long entropy);
  61 bool should_fail(struct fault_attr *attr, ssize_t size);
  62
  63 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  64
  65 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
  66 void cleanup_fault_attr_dentries(struct fault_attr *attr);
  67
  68 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  69
  70 static inline int init_fault_attr_dentries(struct fault_attr *attr,
  71                                           const char *name)
  72 {
  73         return -ENODEV;
  74 }
  75
  76 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
  77 {
  78 }
  79
  80 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  81
  82 #endif /* CONFIG_FAULT_INJECTION */
  83
  84 #ifdef CONFIG_FAILSLAB
  85 extern bool should_failslab(size_t size, gfp_t gfpflags);
  86 #else
  87 static inline bool should_failslab(size_t size, gfp_t gfpflags)
  88 {
  89         return false;
  90 }
  91 #endif /* CONFIG_FAILSLAB */
  92
  93 #endif /* _LINUX_FAULT_INJECT_H */