[linux-2.6-block.git] / include / linux / fault-inject.h

#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 */
Commit	Line	Data
6ff1cb35 AM	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>
6adc4a22	8	#include <linux/ratelimit.h>
60063497	9	#include <linux/atomic.h>
6ff1cb35 AM	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;
621a5f7a	21	bool task_filter;
329409ae AM	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;
6ff1cb35 AM	27
6ff1cb35 AM	28	unsigned long count;
6adc4a22 DM	29	struct ratelimit_state ratelimit_state;
6adc4a22 DM	30	struct dentry *dname;
6ff1cb35 AM	31	};
6ff1cb35 AM	32
6adc4a22 DM	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, \
6ff1cb35 AM	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);
08b3df2d	45	bool should_fail(struct fault_attr *attr, ssize_t size);
6ff1cb35 AM	46
	47	#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
	48
dd48c085 AM	49	struct dentry fault_create_debugfs_attr(const char name,
dd48c085 AM	50	struct dentry parent, struct fault_attr attr);
6ff1cb35 AM	51
	52	#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
	53
dd48c085 AM	54	static inline struct dentry fault_create_debugfs_attr(const char name,
dd48c085 AM	55	struct dentry parent, struct fault_attr attr)
6ff1cb35	56	{
dd48c085	57	return ERR_PTR(-ENODEV);
6ff1cb35 AM	58	}
	59
	60	#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
	61
	62	#endif /* CONFIG_FAULT_INJECTION */
	63
773ff60e	64	#ifdef CONFIG_FAILSLAB
fab9963a	65	extern bool should_failslab(struct kmem_cache *s, gfp_t gfpflags);
773ff60e	66	#else
fab9963a	67	static inline bool should_failslab(struct kmem_cache *s, gfp_t gfpflags)
773ff60e AM	68	{
	69	return false;
	70	}
	71	#endif /* CONFIG_FAILSLAB */
	72
6ff1cb35	73	#endif /* _LINUX_FAULT_INJECT_H */