/* SPDX-License-Identifier: GPL-2.0-or-later *//* *  BSG helper library * *  Copyright (C) 2008   James Smart, Emulex Corporation *  Copyright (C) 2011   Red Hat, Inc.  All rights reserved. *  Copyright (C) 2011   Mike Christie */#ifndef _BLK_BSG_#define _BLK_BSG_ #include <linux/blkdev.h>#include <scsi/scsi_request.h> struct request;struct device;struct scatterlist;struct request_queue; typedef int (bsg_job_fn) (struct bsg_job *);typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *); struct bsg_buffer {	unsigned int payload_len;	int sg_cnt;	struct scatterlist *sg_list;}; struct bsg_job {	struct device *dev; 	struct kref kref; 	unsigned int timeout; 	/* Transport/driver specific request/reply structs */	void *request;	void *reply; 	unsigned int request_len;	unsigned int reply_len;	/*	 * On entry : reply_len indicates the buffer size allocated for	 * the reply.	 *	 * Upon completion : the message handler must set reply_len	 *  to indicates the size of the reply to be returned to the	 *  caller.	 */ 	/* DMA payloads for the request/response */	struct bsg_buffer request_payload;	struct bsg_buffer reply_payload; 	int result;	unsigned int reply_payload_rcv_len; 	/* BIDI support */	struct request *bidi_rq;	struct bio *bidi_bio; 	void *dd_data;		/* Used for driver-specific storage */}; void bsg_job_done(struct bsg_job *job, int result,		  unsigned int reply_payload_rcv_len);struct request_queue *bsg_setup_queue(struct device *dev, const char *name,		bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size);void bsg_remove_queue(struct request_queue *q);void bsg_job_put(struct bsg_job *job);int __must_check bsg_job_get(struct bsg_job *job); #endif