LXR linux/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 */
  14struct 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
  39int setup_fault_attr(struct fault_attr *attr, char *str);
  40bool should_fail(struct fault_attr *attr, ssize_t size);
  41
  42#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  43
  44struct 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
  49static 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
  60extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
  61#else
  62static 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 */
  70