block: cleanup for _blk/blk_rq_prep_clone

}

EXPORT_SYMBOL_GPL(blk_rq_unprep_clone);

/*

 * Copy attributes of the original request to the clone request.

 * The actual data parts (e.g. ->cmd, ->sense) are not copied.

 */

static void __blk_rq_prep_clone(struct request *dst, struct request *src)

{

	dst->__sector = blk_rq_pos(src);

	dst->__data_len = blk_rq_bytes(src);

	if (src->rq_flags & RQF_SPECIAL_PAYLOAD) {

		dst->rq_flags |= RQF_SPECIAL_PAYLOAD;

		dst->special_vec = src->special_vec;

	}

	dst->nr_phys_segments = src->nr_phys_segments;

	dst->ioprio = src->ioprio;

	dst->extra_len = src->extra_len;

}

/**

 * blk_rq_prep_clone - Helper function to setup clone request

 * @rq: the request to be setup

 *

 * Description:

 *     Clones bios in @rq_src to @rq, and copies attributes of @rq_src to @rq.

 *     The actual data parts of @rq_src (e.g. ->cmd, ->sense)

 *     are not copied, and copying such parts is the caller's responsibility.

 *     Also, pages which the original bios are pointing to are not copied

 *     and the cloned bios just point same pages.

 *     So cloned bios must be completed before original bios, which means

			rq->bio = rq->biotail = bio;

	}

	__blk_rq_prep_clone(rq, rq_src);

	/* Copy attributes of the original request to the clone request. */

	rq->__sector = blk_rq_pos(rq_src);

	rq->__data_len = blk_rq_bytes(rq_src);

	if (rq_src->rq_flags & RQF_SPECIAL_PAYLOAD) {

		rq->rq_flags |= RQF_SPECIAL_PAYLOAD;

		rq->special_vec = rq_src->special_vec;

	}

	rq->nr_phys_segments = rq_src->nr_phys_segments;

	rq->ioprio = rq_src->ioprio;

	rq->extra_len = rq_src->extra_len;

	return 0;