[linux-2.6-block.git] / include / linux / blktrace_api.h

#ifndef BLKTRACE_H
#define BLKTRACE_H

#include <linux/blkdev.h>
#include <linux/relay.h>
#include <linux/compat.h>
#include <uapi/linux/blktrace_api.h>

#if defined(CONFIG_BLK_DEV_IO_TRACE)

#include <linux/sysfs.h>

struct blk_trace {
	int trace_state;
	bool rq_based;
	struct rchan *rchan;
	unsigned long __percpu *sequence;
	unsigned char __percpu *msg_data;
	u16 act_mask;
	u64 start_lba;
	u64 end_lba;
	u32 pid;
	u32 dev;
	struct dentry *dir;
	struct dentry *dropped_file;
	struct dentry *msg_file;
	atomic_t dropped;
};

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
extern int do_blk_trace_setup(struct request_queue *q, char *name,
			      dev_t dev, struct block_device *bdev,
			      struct blk_user_trace_setup *buts);
extern __printf(2, 3)
void __trace_note_message(struct blk_trace *, const char *fmt, ...);

/**
 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
 * @q:		queue the io is for
 * @fmt:	format to print message in
 * args...	Variable argument list for format
 *
 * Description:
 *     Records a (simple) message onto the blktrace stream.
 *
 *     NOTE: BLK_TN_MAX_MSG characters are output at most.
 *     NOTE: Can not use 'static inline' due to presence of var args...
 *
 **/
#define blk_add_trace_msg(q, fmt, ...)					\
	do {								\
		struct blk_trace *bt = (q)->blk_trace;			\
		if (unlikely(bt))					\
			__trace_note_message(bt, fmt, ##__VA_ARGS__);	\
	} while (0)
#define BLK_TN_MAX_MSG		128

extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
				void *data, size_t len);
extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
			   struct block_device *bdev,
			   char __user *arg);
extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);
extern void blk_trace_remove_sysfs(struct device *dev);
extern int blk_trace_init_sysfs(struct device *dev);

extern struct attribute_group blk_trace_attr_group;

#else /* !CONFIG_BLK_DEV_IO_TRACE */
# define blk_trace_ioctl(bdev, cmd, arg)		(-ENOTTY)
# define blk_trace_shutdown(q)				do { } while (0)
# define do_blk_trace_setup(q, name, dev, bdev, buts)	(-ENOTTY)
# define blk_add_driver_data(q, rq, data, len)		do {} while (0)
# define blk_trace_setup(q, name, dev, bdev, arg)	(-ENOTTY)
# define blk_trace_startstop(q, start)			(-ENOTTY)
# define blk_trace_remove(q)				(-ENOTTY)
# define blk_add_trace_msg(q, fmt, ...)			do { } while (0)
# define blk_trace_remove_sysfs(dev)			do { } while (0)
static inline int blk_trace_init_sysfs(struct device *dev)
{
	return 0;
}

#endif /* CONFIG_BLK_DEV_IO_TRACE */

#ifdef CONFIG_COMPAT

struct compat_blk_user_trace_setup {
	char name[32];
	u16 act_mask;
	u32 buf_size;
	u32 buf_nr;
	compat_u64 start_lba;
	compat_u64 end_lba;
	u32 pid;
};
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)

#endif

#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)

static inline int blk_cmd_buf_len(struct request *rq)
{
	return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
}

extern void blk_dump_cmd(char *buf, struct request *rq);
extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);

#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */

#endif
Commit	Line	Data
2056a782 JA	1	#ifndef BLKTRACE_H
	2	#define BLKTRACE_H
	3
2056a782 JA	4	#include <linux/blkdev.h>
2056a782 JA	5	#include <linux/relay.h>
62c2a7d9	6	#include <linux/compat.h>
607ca46e	7	#include <uapi/linux/blktrace_api.h>
c0ddffa8	8
c0ddffa8	9	#if defined(CONFIG_BLK_DEV_IO_TRACE)
157f9c00 ACM	10
	11	#include <linux/sysfs.h>
	12
2056a782 JA	13	struct blk_trace {
2056a782 JA	14	int trace_state;
3a366e61	15	bool rq_based;
2056a782	16	struct rchan *rchan;
43cf38eb TH	17	unsigned long __percpu *sequence;
43cf38eb TH	18	unsigned char __percpu *msg_data;
2056a782 JA	19	u16 act_mask;
	20	u64 start_lba;
	21	u64 end_lba;
	22	u32 pid;
	23	u32 dev;
	24	struct dentry *dir;
	25	struct dentry *dropped_file;
02c62304	26	struct dentry *msg_file;
2056a782 JA	27	atomic_t dropped;
	28	};
	29
2056a782	30	extern int blk_trace_ioctl(struct block_device , unsigned, char __user );
165125e1	31	extern void blk_trace_shutdown(struct request_queue *);
d0deef5b SD	32	extern int do_blk_trace_setup(struct request_queue q, char name,
	33	dev_t dev, struct block_device *bdev,
	34	struct blk_user_trace_setup *buts);
b9075fa9	35	extern __printf(2, 3)
08e8138a	36	void __trace_note_message(struct blk_trace , const char fmt, ...);
171044d4	37
9d5f09a4 AB	38	/**
	39	* blk_add_trace_msg - Add a (simple) message to the blktrace stream
	40	* @q: queue the io is for
	41	* @fmt: format to print message in
	42	* args... Variable argument list for format
	43	*
	44	* Description:
	45	* Records a (simple) message onto the blktrace stream.
	46	*
	47	* NOTE: BLK_TN_MAX_MSG characters are output at most.
	48	* NOTE: Can not use 'static inline' due to presence of var args...
	49	*
	50	**/
	51	#define blk_add_trace_msg(q, fmt, ...) \
	52	do { \
	53	struct blk_trace *bt = (q)->blk_trace; \
	54	if (unlikely(bt)) \
	55	__trace_note_message(bt, fmt, ##__VA_ARGS__); \
	56	} while (0)
64565911	57	#define BLK_TN_MAX_MSG 128
2056a782	58
5f3ea37c ACM	59	extern void blk_add_driver_data(struct request_queue q, struct request rq,
5f3ea37c ACM	60	void *data, size_t len);
7da975a2	61	extern int blk_trace_setup(struct request_queue q, char name, dev_t dev,
d0deef5b	62	struct block_device *bdev,
6da127ad	63	char __user *arg);
7da975a2 MP	64	extern int blk_trace_startstop(struct request_queue *q, int start);
7da975a2 MP	65	extern int blk_trace_remove(struct request_queue *q);
48c0d4d4	66	extern void blk_trace_remove_sysfs(struct device *dev);
1d54ad6d	67	extern int blk_trace_init_sysfs(struct device *dev);
6da127ad	68
157f9c00 ACM	69	extern struct attribute_group blk_trace_attr_group;
157f9c00 ACM	70
2056a782	71	#else /* !CONFIG_BLK_DEV_IO_TRACE */
d0deef5b SD	72	# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
	73	# define blk_trace_shutdown(q) do { } while (0)
	74	# define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
	75	# define blk_add_driver_data(q, rq, data, len) do {} while (0)
	76	# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
	77	# define blk_trace_startstop(q, start) (-ENOTTY)
	78	# define blk_trace_remove(q) (-ENOTTY)
	79	# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
b0da3f0d	80	# define blk_trace_remove_sysfs(dev) do { } while (0)
1d54ad6d LZ	81	static inline int blk_trace_init_sysfs(struct device *dev)
	82	{
	83	return 0;
	84	}
	85
2056a782	86	#endif /* CONFIG_BLK_DEV_IO_TRACE */
d0deef5b	87
2669b19f SR	88	#ifdef CONFIG_COMPAT
	89
	90	struct compat_blk_user_trace_setup {
	91	char name[32];
	92	u16 act_mask;
	93	u32 buf_size;
	94	u32 buf_nr;
	95	compat_u64 start_lba;
	96	compat_u64 end_lba;
	97	u32 pid;
	98	};
	99	#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
	100
	101	#endif
	102
f1db457c	103	#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
55782138 LZ	104
	105	static inline int blk_cmd_buf_len(struct request *rq)
	106	{
33659ebb	107	return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
55782138 LZ	108	}
	109
	110	extern void blk_dump_cmd(char buf, struct request rq);
	111	extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
55782138	112
f1db457c	113	#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
55782138	114
2056a782	115	#endif