#undef TRACE_SYSTEM
  #define TRACE_SYSTEM block

  #if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ)
  #define _TRACE_BLOCK_H
  
  #include <linux/blktrace_api.h>
  #include <linux/blkdev.h>

  #include <linux/buffer_head.h>

  #include <linux/tracepoint.h>

  #define RWBS_LEN	8

  DECLARE_EVENT_CLASS(block_buffer,
  
  	TP_PROTO(struct buffer_head *bh),
  
  	TP_ARGS(bh),
  
  	TP_STRUCT__entry (
  		__field(  dev_t,	dev			)
  		__field(  sector_t,	sector			)
  		__field(  size_t,	size			)
  	),
  
  	TP_fast_assign(
  		__entry->dev		= bh->b_bdev->bd_dev;
  		__entry->sector		= bh->b_blocknr;
  		__entry->size		= bh->b_size;
  	),
  
  	TP_printk("%d,%d sector=%llu size=%zu",
  		MAJOR(__entry->dev), MINOR(__entry->dev),
  		(unsigned long long)__entry->sector, __entry->size
  	)
  );
  
  /**
   * block_touch_buffer - mark a buffer accessed
   * @bh: buffer_head being touched
   *
   * Called from touch_buffer().
   */
  DEFINE_EVENT(block_buffer, block_touch_buffer,
  
  	TP_PROTO(struct buffer_head *bh),
  
  	TP_ARGS(bh)
  );
  
  /**
   * block_dirty_buffer - mark a buffer dirty
   * @bh: buffer_head being dirtied
   *
   * Called from mark_buffer_dirty().
   */
  DEFINE_EVENT(block_buffer, block_dirty_buffer,
  
  	TP_PROTO(struct buffer_head *bh),
  
  	TP_ARGS(bh)
  );

  DECLARE_EVENT_CLASS(block_rq_with_error,

  
  	TP_PROTO(struct request_queue *q, struct request *rq),
  
  	TP_ARGS(q, rq),
  
  	TP_STRUCT__entry(
  		__field(  dev_t,	dev			)
  		__field(  sector_t,	sector			)
  		__field(  unsigned int,	nr_sector		)
  		__field(  int,		errors			)

  		__array(  char,		rwbs,	RWBS_LEN	)

  		__dynamic_array( char,	cmd,	blk_cmd_buf_len(rq)	)
  	),
  
  	TP_fast_assign(
  		__entry->dev	   = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;

  		__entry->sector    = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
  					0 : blk_rq_pos(rq);
  		__entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
  					0 : blk_rq_sectors(rq);

  		__entry->errors    = rq->errors;

  		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));

  		blk_dump_cmd(__get_str(cmd), rq);
  	),
  
  	TP_printk("%d,%d %s (%s) %llu + %u [%d]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev),
  		  __entry->rwbs, __get_str(cmd),

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->errors)

  );

  /**
   * block_rq_abort - abort block operation request
   * @q: queue containing the block operation request
   * @rq: block IO operation request
   *
   * Called immediately after pending block IO operation request @rq in
   * queue @q is aborted. The fields in the operation request @rq
   * can be examined to determine which device and sectors the pending
   * operation would access.
   */

  DEFINE_EVENT(block_rq_with_error, block_rq_abort,

  
  	TP_PROTO(struct request_queue *q, struct request *rq),

  	TP_ARGS(q, rq)
  );

  /**
   * block_rq_requeue - place block IO request back on a queue
   * @q: queue holding operation
   * @rq: block IO operation request
   *
   * The block operation request @rq is being placed back into queue
   * @q.  For some reason the request was not completed and needs to be
   * put back in the queue.
   */

  DEFINE_EVENT(block_rq_with_error, block_rq_requeue,

  	TP_PROTO(struct request_queue *q, struct request *rq),

  	TP_ARGS(q, rq)
  );

  /**
   * block_rq_complete - block IO operation completed by device driver
   * @q: queue containing the block operation request
   * @rq: block operations request

   * @nr_bytes: number of completed bytes

   *
   * The block_rq_complete tracepoint event indicates that some portion
   * of operation request has been completed by the device driver.  If
   * the @rq->bio is %NULL, then there is absolutely no additional work to
   * do for the request. If @rq->bio is non-NULL then there is
   * additional work required to complete the request.
   */

  TRACE_EVENT(block_rq_complete,

  	TP_PROTO(struct request_queue *q, struct request *rq,
  		 unsigned int nr_bytes),

  	TP_ARGS(q, rq, nr_bytes),
  
  	TP_STRUCT__entry(
  		__field(  dev_t,	dev			)
  		__field(  sector_t,	sector			)
  		__field(  unsigned int,	nr_sector		)
  		__field(  int,		errors			)
  		__array(  char,		rwbs,	RWBS_LEN	)
  		__dynamic_array( char,	cmd,	blk_cmd_buf_len(rq)	)
  	),
  
  	TP_fast_assign(
  		__entry->dev	   = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
  		__entry->sector    = blk_rq_pos(rq);
  		__entry->nr_sector = nr_bytes >> 9;
  		__entry->errors    = rq->errors;
  
  		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, nr_bytes);
  		blk_dump_cmd(__get_str(cmd), rq);
  	),
  
  	TP_printk("%d,%d %s (%s) %llu + %u [%d]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev),
  		  __entry->rwbs, __get_str(cmd),
  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->errors)

  );

  DECLARE_EVENT_CLASS(block_rq,

  
  	TP_PROTO(struct request_queue *q, struct request *rq),
  
  	TP_ARGS(q, rq),
  
  	TP_STRUCT__entry(
  		__field(  dev_t,	dev			)
  		__field(  sector_t,	sector			)
  		__field(  unsigned int,	nr_sector		)
  		__field(  unsigned int,	bytes			)

  		__array(  char,		rwbs,	RWBS_LEN	)

  		__array(  char,         comm,   TASK_COMM_LEN   )

  		__dynamic_array( char,	cmd,	blk_cmd_buf_len(rq)	)
  	),
  
  	TP_fast_assign(
  		__entry->dev	   = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;

  		__entry->sector    = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
  					0 : blk_rq_pos(rq);
  		__entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
  					0 : blk_rq_sectors(rq);
  		__entry->bytes     = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
  					blk_rq_bytes(rq) : 0;

  		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));

  		blk_dump_cmd(__get_str(cmd), rq);
  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev),
  		  __entry->rwbs, __entry->bytes, __get_str(cmd),

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->comm)

  );

  /**
   * block_rq_insert - insert block operation request into queue
   * @q: target queue
   * @rq: block IO operation request
   *
   * Called immediately before block operation request @rq is inserted
   * into queue @q.  The fields in the operation request @rq struct can
   * be examined to determine which device and sectors the pending
   * operation would access.
   */

  DEFINE_EVENT(block_rq, block_rq_insert,

  
  	TP_PROTO(struct request_queue *q, struct request *rq),

  	TP_ARGS(q, rq)

  );

  /**
   * block_rq_issue - issue pending block IO request operation to device driver
   * @q: queue holding operation
   * @rq: block IO operation operation request
   *
   * Called when block operation request @rq from queue @q is sent to a
   * device driver for processing.
   */

  DEFINE_EVENT(block_rq, block_rq_issue,

  
  	TP_PROTO(struct request_queue *q, struct request *rq),

  	TP_ARGS(q, rq)

  );

  /**
   * block_bio_bounce - used bounce buffer when processing block operation
   * @q: queue holding the block operation
   * @bio: block operation
   *
   * A bounce buffer was used to handle the block operation @bio in @q.
   * This occurs when hardware limitations prevent a direct transfer of
   * data between the @bio data memory area and the IO device.  Use of a
   * bounce buffer requires extra copying of data and decreases
   * performance.
   */

  TRACE_EVENT(block_bio_bounce,
  
  	TP_PROTO(struct request_queue *q, struct bio *bio),
  
  	TP_ARGS(q, bio),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev			)
  		__field( sector_t,	sector			)
  		__field( unsigned int,	nr_sector		)

  		__array( char,		rwbs,	RWBS_LEN	)

  		__array( char,		comm,	TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(

  		__entry->dev		= bio->bi_bdev ?
  					  bio->bi_bdev->bd_dev : 0;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->nr_sector	= bio_sectors(bio);

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("%d,%d %s %llu + %u [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->comm)

  );

  /**
   * block_bio_complete - completed all work on the block operation

   * @q: queue holding the block operation

   * @bio: block operation completed

   * @error: io error value

   *
   * This tracepoint indicates there is no further work to do on this
   * block IO operation @bio.
   */

  TRACE_EVENT(block_bio_complete,

  	TP_PROTO(struct request_queue *q, struct bio *bio, int error),

  	TP_ARGS(q, bio, error),

  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev		)
  		__field( sector_t,	sector		)
  		__field( unsigned,	nr_sector	)
  		__field( int,		error		)

  		__array( char,		rwbs,	RWBS_LEN)

  	),
  
  	TP_fast_assign(

  		__entry->dev		= bio->bi_bdev->bd_dev;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->nr_sector	= bio_sectors(bio);

  		__entry->error		= error;

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  	),
  
  	TP_printk("%d,%d %s %llu + %u [%d]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->error)

  );

  DECLARE_EVENT_CLASS(block_bio_merge,

  	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

  	TP_ARGS(q, rq, bio),

  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev			)
  		__field( sector_t,	sector			)
  		__field( unsigned int,	nr_sector		)

  		__array( char,		rwbs,	RWBS_LEN	)

  		__array( char,		comm,	TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(
  		__entry->dev		= bio->bi_bdev->bd_dev;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->nr_sector	= bio_sectors(bio);

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("%d,%d %s %llu + %u [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->comm)

  );

  /**
   * block_bio_backmerge - merging block operation to the end of an existing operation
   * @q: queue holding operation

   * @rq: request bio is being merged into

   * @bio: new block operation to merge
   *
   * Merging block request @bio to the end of an existing block request
   * in queue @q.
   */

  DEFINE_EVENT(block_bio_merge, block_bio_backmerge,

  	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

  	TP_ARGS(q, rq, bio)

  );

  /**
   * block_bio_frontmerge - merging block operation to the beginning of an existing operation
   * @q: queue holding operation

   * @rq: request bio is being merged into

   * @bio: new block operation to merge
   *
   * Merging block IO operation @bio to the beginning of an existing block
   * operation in queue @q.
   */

  DEFINE_EVENT(block_bio_merge, block_bio_frontmerge,

  	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

  	TP_ARGS(q, rq, bio)

  );

  /**
   * block_bio_queue - putting new block IO operation in queue
   * @q: queue holding operation
   * @bio: new block operation
   *
   * About to place the block IO operation @bio into queue @q.
   */

  TRACE_EVENT(block_bio_queue,

  	TP_PROTO(struct request_queue *q, struct bio *bio),

  	TP_ARGS(q, bio),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev			)
  		__field( sector_t,	sector			)
  		__field( unsigned int,	nr_sector		)
  		__array( char,		rwbs,	RWBS_LEN	)
  		__array( char,		comm,	TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(
  		__entry->dev		= bio->bi_bdev->bd_dev;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->nr_sector	= bio_sectors(bio);

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("%d,%d %s %llu + %u [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->comm)

  );

  DECLARE_EVENT_CLASS(block_get_rq,

  
  	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
  
  	TP_ARGS(q, bio, rw),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev			)
  		__field( sector_t,	sector			)
  		__field( unsigned int,	nr_sector		)

  		__array( char,		rwbs,	RWBS_LEN	)

  		__array( char,		comm,	TASK_COMM_LEN	)
          ),
  
  	TP_fast_assign(
  		__entry->dev		= bio ? bio->bi_bdev->bd_dev : 0;

  		__entry->sector		= bio ? bio->bi_iter.bi_sector : 0;

  		__entry->nr_sector	= bio ? bio_sectors(bio) : 0;

  		blk_fill_rwbs(__entry->rwbs,
  			      bio ? bio->bi_rw : 0, __entry->nr_sector);
  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
          ),
  
  	TP_printk("%d,%d %s %llu + %u [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector, __entry->comm)

  );

  /**
   * block_getrq - get a free request entry in queue for block IO operations
   * @q: queue for operations
   * @bio: pending block IO operation
   * @rw: low bit indicates a read (%0) or a write (%1)
   *
   * A request struct for queue @q has been allocated to handle the
   * block IO operation @bio.
   */

  DEFINE_EVENT(block_get_rq, block_getrq,

  
  	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),

  	TP_ARGS(q, bio, rw)
  );

  /**
   * block_sleeprq - waiting to get a free request entry in queue for block IO operation
   * @q: queue for operation
   * @bio: pending block IO operation
   * @rw: low bit indicates a read (%0) or a write (%1)
   *
   * In the case where a request struct cannot be provided for queue @q
   * the process needs to wait for an request struct to become
   * available.  This tracepoint event is generated each time the
   * process goes to sleep waiting for request struct become available.
   */

  DEFINE_EVENT(block_get_rq, block_sleeprq,

  	TP_PROTO(struct request_queue *q, struct bio *bio, int rw),

  	TP_ARGS(q, bio, rw)

  );

  /**
   * block_plug - keep operations requests in request queue
   * @q: request queue to plug
   *
   * Plug the request queue @q.  Do not allow block operation requests
   * to be sent to the device driver. Instead, accumulate requests in
   * the queue to improve throughput performance of the block device.
   */

  TRACE_EVENT(block_plug,
  
  	TP_PROTO(struct request_queue *q),
  
  	TP_ARGS(q),
  
  	TP_STRUCT__entry(
  		__array( char,		comm,	TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(
  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("[%s]", __entry->comm)
  );

  DECLARE_EVENT_CLASS(block_unplug,

  	TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit),

  	TP_ARGS(q, depth, explicit),

  
  	TP_STRUCT__entry(
  		__field( int,		nr_rq			)
  		__array( char,		comm,	TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(

  		__entry->nr_rq = depth;

  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("[%s] %d", __entry->comm, __entry->nr_rq)
  );

  /**

   * block_unplug - release of operations requests in request queue

   * @q: request queue to unplug

   * @depth: number of requests just added to the queue

   * @explicit: whether this was an explicit unplug, or one from schedule()

   *
   * Unplug request queue @q because device driver is scheduled to work
   * on elements in the request queue.
   */

  DEFINE_EVENT(block_unplug, block_unplug,

  	TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit),

  	TP_ARGS(q, depth, explicit)

  );

  /**
   * block_split - split a single bio struct into two bio structs
   * @q: queue containing the bio
   * @bio: block operation being split
   * @new_sector: The starting sector for the new bio
   *
   * The bio request @bio in request queue @q needs to be split into two
   * bio requests. The newly created @bio request starts at
   * @new_sector. This split may be required due to hardware limitation
   * such as operation crossing device boundaries in a RAID system.
   */

  TRACE_EVENT(block_split,
  
  	TP_PROTO(struct request_queue *q, struct bio *bio,
  		 unsigned int new_sector),
  
  	TP_ARGS(q, bio, new_sector),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev				)
  		__field( sector_t,	sector				)
  		__field( sector_t,	new_sector			)

  		__array( char,		rwbs,		RWBS_LEN	)

  		__array( char,		comm,		TASK_COMM_LEN	)
  	),
  
  	TP_fast_assign(
  		__entry->dev		= bio->bi_bdev->bd_dev;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->new_sector	= new_sector;

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
  	),
  
  	TP_printk("%d,%d %s %llu / %llu [%s]",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  (unsigned long long)__entry->new_sector,
  		  __entry->comm)

  );

  /**

   * block_bio_remap - map request for a logical device to the raw device

   * @q: queue holding the operation
   * @bio: revised operation
   * @dev: device for the operation
   * @from: original sector for the operation
   *

   * An operation for a logical device has been mapped to the

   * raw block device.
   */

  TRACE_EVENT(block_bio_remap,

  
  	TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
  		 sector_t from),
  
  	TP_ARGS(q, bio, dev, from),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev		)
  		__field( sector_t,	sector		)
  		__field( unsigned int,	nr_sector	)
  		__field( dev_t,		old_dev		)
  		__field( sector_t,	old_sector	)

  		__array( char,		rwbs,	RWBS_LEN)

  	),
  
  	TP_fast_assign(
  		__entry->dev		= bio->bi_bdev->bd_dev;

  		__entry->sector		= bio->bi_iter.bi_sector;

  		__entry->nr_sector	= bio_sectors(bio);

  		__entry->old_dev	= dev;
  		__entry->old_sector	= from;

  		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);

  	),
  
  	TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,

  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector,

  		  MAJOR(__entry->old_dev), MINOR(__entry->old_dev),

  		  (unsigned long long)__entry->old_sector)

  );

  /**
   * block_rq_remap - map request for a block operation request
   * @q: queue holding the operation
   * @rq: block IO operation request
   * @dev: device for the operation
   * @from: original sector for the operation
   *
   * The block operation request @rq in @q has been remapped.  The block
   * operation request @rq holds the current information and @from hold
   * the original sector.
   */

  TRACE_EVENT(block_rq_remap,
  
  	TP_PROTO(struct request_queue *q, struct request *rq, dev_t dev,
  		 sector_t from),
  
  	TP_ARGS(q, rq, dev, from),
  
  	TP_STRUCT__entry(
  		__field( dev_t,		dev		)
  		__field( sector_t,	sector		)
  		__field( unsigned int,	nr_sector	)
  		__field( dev_t,		old_dev		)
  		__field( sector_t,	old_sector	)

  		__field( unsigned int,	nr_bios		)

  		__array( char,		rwbs,	RWBS_LEN)

  	),
  
  	TP_fast_assign(
  		__entry->dev		= disk_devt(rq->rq_disk);
  		__entry->sector		= blk_rq_pos(rq);
  		__entry->nr_sector	= blk_rq_sectors(rq);
  		__entry->old_dev	= dev;
  		__entry->old_sector	= from;

  		__entry->nr_bios	= blk_rq_count_bios(rq);

  		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));

  	),

  	TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu %u",

  		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
  		  (unsigned long long)__entry->sector,
  		  __entry->nr_sector,
  		  MAJOR(__entry->old_dev), MINOR(__entry->old_dev),

  		  (unsigned long long)__entry->old_sector, __entry->nr_bios)

  );

  #endif /* _TRACE_BLOCK_H */
  
  /* This part must be outside protection */
  #include <trace/define_trace.h>