Commit c35950bf authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/blkback: Union the blkif_request request specific fields 



Following in the steps of patch:
"xen: Union the blkif_request request specific fields" this patch
changes the blkback. Per the original patch:

"Prepare for extending the block device ring to allow request
specific fields, by moving the request specific fields for
reads, writes and barrier requests to a union member."

Cc: Owen Smith <owen.smith@citrix.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent e8e28871

drivers/xen/blkback/blkback.c

+7 −7
Original line number Diff line number Diff line
@@ -426,7 +426,7 @@ static void dispatch_rw_block_io(blkif_t *blkif, 
	}



	preq.dev           = req->handle;

	preq.sector_number = req->sector_number;

	preq.sector_number = req->u.rw.sector_number;

	preq.nr_sects      = 0;



	pending_req->blkif     = blkif;
@@ -438,11 +438,11 @@ static void dispatch_rw_block_io(blkif_t *blkif, 
	for (i = 0; i < nseg; i++) {

		uint32_t flags;



		seg[i].nsec = req->seg[i].last_sect -

			req->seg[i].first_sect + 1;

		seg[i].nsec = req->u.rw.seg[i].last_sect -

			req->u.rw.seg[i].first_sect + 1;



		if ((req->seg[i].last_sect >= (PAGE_SIZE >> 9)) ||

		    (req->seg[i].last_sect < req->seg[i].first_sect))

		if ((req->u.rw.seg[i].last_sect >= (PAGE_SIZE >> 9)) ||

		    (req->u.rw.seg[i].last_sect < req->u.rw.seg[i].first_sect))

			goto fail_response;

		preq.nr_sects += seg[i].nsec;
@@ -450,7 +450,7 @@ static void dispatch_rw_block_io(blkif_t *blkif, 
		if (operation != READ)

			flags |= GNTMAP_readonly;

		gnttab_set_map_op(&map[i], vaddr(pending_req, i), flags,

				  req->seg[i].gref, blkif->domid);

				  req->u.rw.seg[i].gref, blkif->domid);

	}



	ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map, nseg);
@@ -472,7 +472,7 @@ static void dispatch_rw_block_io(blkif_t *blkif, 
			page_to_pfn(blkbk->pending_page(pending_req, i)),

			FOREIGN_FRAME(map[i].dev_bus_addr >> PAGE_SHIFT));

		seg[i].buf  = map[i].dev_bus_addr |

			(req->seg[i].first_sect << 9);

			(req->u.rw.seg[i].first_sect << 9);

	}



	if (ret)

include/xen/blkif.h

+4 −4
Original line number Diff line number Diff line
@@ -96,12 +96,12 @@ static void inline blkif_get_x86_32_req(struct blkif_request *dst, struct blkif_ 
	dst->nr_segments = src->nr_segments;

	dst->handle = src->handle;

	dst->id = src->id;

	dst->sector_number = src->sector_number;

	dst->u.rw.sector_number = src->sector_number;

	barrier();

	if (n > dst->nr_segments)

		n = dst->nr_segments;

	for (i = 0; i < n; i++)

		dst->seg[i] = src->seg[i];

		dst->u.rw.seg[i] = src->seg[i];

}



static void inline blkif_get_x86_64_req(struct blkif_request *dst, struct blkif_x86_64_request *src)
@@ -111,12 +111,12 @@ static void inline blkif_get_x86_64_req(struct blkif_request *dst, struct blkif_ 
	dst->nr_segments = src->nr_segments;

	dst->handle = src->handle;

	dst->id = src->id;

	dst->sector_number = src->sector_number;

	dst->u.rw.sector_number = src->sector_number;

	barrier();

	if (n > dst->nr_segments)

		n = dst->nr_segments;

	for (i = 0; i < n; i++)

		dst->seg[i] = src->seg[i];

		dst->u.rw.seg[i] = src->seg[i];

}



#endif /* __XEN_BLKIF_H__ */

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