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include/linux/fault-inject.h 1.98 KB
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  #ifndef _LINUX_FAULT_INJECT_H
  #define _LINUX_FAULT_INJECT_H
  
  #ifdef CONFIG_FAULT_INJECTION
  
  #include <linux/types.h>
  #include <linux/debugfs.h>
  #include <asm/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;
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  	u32 task_filter;
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  	unsigned long stacktrace_depth;
  	unsigned long require_start;
  	unsigned long require_end;
  	unsigned long reject_start;
  	unsigned long reject_end;
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  	unsigned long count;
  
  #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  
  	struct {
  		struct dentry *dir;
  
  		struct dentry *probability_file;
  		struct dentry *interval_file;
  		struct dentry *times_file;
  		struct dentry *space_file;
  		struct dentry *verbose_file;
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  		struct dentry *task_filter_file;
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  		struct dentry *stacktrace_depth_file;
  		struct dentry *require_start_file;
  		struct dentry *require_end_file;
  		struct dentry *reject_start_file;
  		struct dentry *reject_end_file;
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  	} dentries;
  
  #endif
  };
  
  #define FAULT_ATTR_INITIALIZER {				\
  		.interval = 1,					\
  		.times = ATOMIC_INIT(1),			\
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  		.require_end = ULONG_MAX,			\
  		.stacktrace_depth = 32,				\
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  		.verbose = 2,					\
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  	}
  
  #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
  int setup_fault_attr(struct fault_attr *attr, char *str);
  void should_fail_srandom(unsigned long entropy);
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  bool should_fail(struct fault_attr *attr, ssize_t size);
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  #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  
  int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
  void cleanup_fault_attr_dentries(struct fault_attr *attr);
  
  #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  
  static inline int init_fault_attr_dentries(struct fault_attr *attr,
  					  const char *name)
  {
  	return -ENODEV;
  }
  
  static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
  {
  }
  
  #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  
  #endif /* CONFIG_FAULT_INJECTION */
  
  #endif /* _LINUX_FAULT_INJECT_H */