D29598.diff
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D29598.diff
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	Index: sys/dev/xen/blkfront/blkfront.c
	===================================================================
	--- sys/dev/xen/blkfront/blkfront.c
	+++ sys/dev/xen/blkfront/blkfront.c
	@@ -268,12 +268,19 @@
	sizeof(grant_ref_t) * sc->xbd_max_request_indirectpages);
	}

	- if (cm->cm_operation == BLKIF_OP_READ)
	+ switch (cm->cm_operation) {
	+ case BLKIF_OP_READ:
	op = BUS_DMASYNC_PREREAD;
	- else if (cm->cm_operation == BLKIF_OP_WRITE)
	+ break;
	+ case BLKIF_OP_WRITE:
	+ case BLKIF_OP_WRITE_BARRIER:
	+ case BLKIF_OP_FLUSH_DISKCACHE:
	op = BUS_DMASYNC_PREWRITE;
	- else
	+ break;
	+ default:
	op = 0;
	+ }
	+
	bus_dmamap_sync(sc->xbd_io_dmat, cm->cm_map, op);

	gnttab_free_grant_references(cm->cm_gref_head);