#ifndef _LINUX_FAULT_INJECT_H
  #define _LINUX_FAULT_INJECT_H
  
  #ifdef CONFIG_FAULT_INJECTION
  
  #include <linux/types.h>
  #include <linux/debugfs.h>

  #include <linux/ratelimit.h>

  #include <linux/atomic.h>

  
  /*
   * For explanation of the elements of this struct, see
   * Documentation/fault-injection/fault-injection.txt
   */
  struct fault_attr {
  	unsigned long probability;
  	unsigned long interval;
  	atomic_t times;
  	atomic_t space;
  	unsigned long verbose;

  	bool task_filter;

  	unsigned long stacktrace_depth;
  	unsigned long require_start;
  	unsigned long require_end;
  	unsigned long reject_start;
  	unsigned long reject_end;

  
  	unsigned long count;

  	struct ratelimit_state ratelimit_state;
  	struct dentry *dname;

  };

  #define FAULT_ATTR_INITIALIZER {					\
  		.interval = 1,						\
  		.times = ATOMIC_INIT(1),				\
  		.require_end = ULONG_MAX,				\
  		.stacktrace_depth = 32,					\
  		.ratelimit_state = RATELIMIT_STATE_INIT_DISABLED,	\
  		.verbose = 2,						\
  		.dname = NULL,						\

  	}
  
  #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
  int setup_fault_attr(struct fault_attr *attr, char *str);

  bool should_fail(struct fault_attr *attr, ssize_t size);

  
  #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

  struct dentry *fault_create_debugfs_attr(const char *name,
  			struct dentry *parent, struct fault_attr *attr);

  
  #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */

  static inline struct dentry *fault_create_debugfs_attr(const char *name,
  			struct dentry *parent, struct fault_attr *attr)

  {

  	return ERR_PTR(-ENODEV);

  }
  
  #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  
  #endif /* CONFIG_FAULT_INJECTION */

  #ifdef CONFIG_FAILSLAB

  extern bool should_failslab(struct kmem_cache *s, gfp_t gfpflags);

  #else

  static inline bool should_failslab(struct kmem_cache *s, gfp_t gfpflags)

  {
  	return false;
  }
  #endif /* CONFIG_FAILSLAB */

  #endif /* _LINUX_FAULT_INJECT_H */