blktrace_api.h 3.31 KB
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#ifndef BLKTRACE_H
#define BLKTRACE_H

#include <linux/blkdev.h>
#include <linux/relay.h>
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#include <linux/compat.h>
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#include <uapi/linux/blktrace_api.h>
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#include <linux/list.h>
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#if defined(CONFIG_BLK_DEV_IO_TRACE)
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#include <linux/sysfs.h>

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

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
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extern void blk_trace_shutdown(struct request_queue *);
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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);
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extern __printf(2, 3)
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void __trace_note_message(struct blk_trace *, const char *fmt, ...);
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/**
 * 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)
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#define BLK_TN_MAX_MSG		128
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extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
				void *data, size_t len);
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extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
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			   struct block_device *bdev,
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			   char __user *arg);
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extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);
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extern void blk_trace_remove_sysfs(struct device *dev);
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extern int blk_trace_init_sysfs(struct device *dev);
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extern struct attribute_group blk_trace_attr_group;

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#else /* !CONFIG_BLK_DEV_IO_TRACE */
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# 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)
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# define blk_trace_remove_sysfs(dev)			do { } while (0)
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static inline int blk_trace_init_sysfs(struct device *dev)
{
	return 0;
}

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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#ifdef CONFIG_COMPAT

struct compat_blk_user_trace_setup {
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	char name[BLKTRACE_BDEV_SIZE];
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	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

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

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

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#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
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#endif