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 <asm/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#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
  59int setup_fault_attr(struct fault_attr *attr, char *str);
  60void should_fail_srandom(unsigned long entropy);
  61bool should_fail(struct fault_attr *attr, ssize_t size);
  62
  63#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  64
  65int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
  66void cleanup_fault_attr_dentries(struct fault_attr *attr);
  67
  68#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  69
  70static inline int init_fault_attr_dentries(struct fault_attr *attr,
  71                                          const char *name)
  72{
  73        return -ENODEV;
  74}
  75
  76static 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
  85extern bool should_failslab(size_t size, gfp_t gfpflags);
  86#else
  87static 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 */
  94