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/ratelimit.h>
   9 #include <linux/atomic.h>
  10
  11 /*
  12  * For explanation of the elements of this struct, see
  13  * Documentation/fault-injection/fault-injection.txt
  14  */
  15 struct fault_attr {
  16         unsigned long probability;
  17         unsigned long interval;
  18         atomic_t times;
  19         atomic_t space;
  20         unsigned long verbose;
  21         u32 task_filter;
  22         unsigned long stacktrace_depth;
  23         unsigned long require_start;
  24         unsigned long require_end;
  25         unsigned long reject_start;
  26         unsigned long reject_end;
  27
  28         unsigned long count;
  29         struct ratelimit_state ratelimit_state;
  30         struct dentry *dname;
  31 };
  32
  33 #define FAULT_ATTR_INITIALIZER {                                        \
  34                 .interval = 1,                                          \
  35                 .times = ATOMIC_INIT(1),                                \
  36                 .require_end = ULONG_MAX,                               \
  37                 .stacktrace_depth = 32,                                 \
  38                 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED,       \
  39                 .verbose = 2,                                           \
  40                 .dname = NULL,                                          \
  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 bool should_fail(struct fault_attr *attr, ssize_t size);
  46
  47 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  48
  49 struct dentry *fault_create_debugfs_attr(const char *name,
  50                         struct dentry *parent, struct fault_attr *attr);
  51
  52 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  53
  54 static inline struct dentry *fault_create_debugfs_attr(const char *name,
  55                         struct dentry *parent, struct fault_attr *attr)
  56 {
  57         return ERR_PTR(-ENODEV);
  58 }
  59
  60 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  61
  62 #endif /* CONFIG_FAULT_INJECTION */
  63
  64 #ifdef CONFIG_FAILSLAB
  65 extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
  66 #else
  67 static inline bool should_failslab(size_t size, gfp_t gfpflags,
  68                                 unsigned long flags)
  69 {
  70         return false;
  71 }
  72 #endif /* CONFIG_FAILSLAB */
  73
  74 #endif /* _LINUX_FAULT_INJECT_H */