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Commit 2836ee4b authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

blk-mq: Add blk_mq_ops.show_rq() 



This new callback function will be used in the next patch to show
more information about SCSI requests.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarOmar Sandoval <osandov@fb.com>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 8658dca8

block/blk-mq-debugfs.c

+5 −1
Original line number Diff line number Diff line
@@ -311,6 +311,7 @@ static const char *const rqf_name[] = { 
static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)

{

	struct request *rq = list_entry_rq(v);

	const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;

	const unsigned int op = rq->cmd_flags & REQ_OP_MASK;



	seq_printf(m, "%p {.op=", rq);
@@ -324,8 +325,11 @@ static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) 
	seq_puts(m, ", .rq_flags=");

	blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,

		       ARRAY_SIZE(rqf_name));

	seq_printf(m, ", .tag=%d, .internal_tag=%d}\n", rq->tag,

	seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,

		   rq->internal_tag);

	if (mq_ops->show_rq)

		mq_ops->show_rq(m, rq);

	seq_puts(m, "}\n");

	return 0;

}

include/linux/blk-mq.h

+8 −0
Original line number Diff line number Diff line
@@ -142,6 +142,14 @@ struct blk_mq_ops { 
	reinit_request_fn	*reinit_request;



	map_queues_fn		*map_queues;



#ifdef CONFIG_BLK_DEBUG_FS

	/*

	 * Used by the debugfs implementation to show driver-specific

	 * information about a request.

	 */

	void (*show_rq)(struct seq_file *m, struct request *rq);

#endif

};



enum {