xen: Union the blkif_request request specific fields

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.

Acked-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Owen Smith <owen.smith@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index d7aa39e..cc4514c 100644 (file)
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -281,7 +281,7 @@ static int blkif_queue_request(struct request *req)
        info->shadow[id].request = req;
 
        ring_req->id = id;
-       ring_req->sector_number = (blkif_sector_t)blk_rq_pos(req);
+       ring_req->u.rw.sector_number = (blkif_sector_t)blk_rq_pos(req);
        ring_req->handle = info->handle;
 
        ring_req->operation = rq_data_dir(req) ?
@@ -317,7 +317,7 @@ static int blkif_queue_request(struct request *req)
                                rq_data_dir(req) );
 
                info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
-               ring_req->seg[i] =
+               ring_req->u.rw.seg[i] =
                                (struct blkif_request_segment) {
                                        .gref       = ref,
                                        .first_sect = fsect,
@@ -615,7 +615,7 @@ static void blkif_completion(struct blk_shadow *s)
 {
        int i;
        for (i = 0; i < s->req.nr_segments; i++)
-               gnttab_end_foreign_access(s->req.seg[i].gref, 0, 0UL);
+               gnttab_end_foreign_access(s->req.u.rw.seg[i].gref, 0, 0UL);
 }
 
 static irqreturn_t blkif_interrupt(int irq, void *dev_id)
@@ -932,7 +932,7 @@ static int blkif_recover(struct blkfront_info *info)
                /* Rewrite any grant references invalidated by susp/resume. */
                for (j = 0; j < req->nr_segments; j++)
                        gnttab_grant_foreign_access_ref(
-                               req->seg[j].gref,
+                               req->u.rw.seg[j].gref,
                                info->xbdev->otherend_id,
                                pfn_to_mfn(info->shadow[req->id].frame[j]),
                                rq_data_dir(info->shadow[req->id].request));

diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h
index c2d1fa4..e4f743c 100644 (file)
--- a/include/xen/interface/io/blkif.h
+++ b/include/xen/interface/io/blkif.h
@@ -51,11 +51,7 @@ typedef uint64_t blkif_sector_t;
  */
 #define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
 
-struct blkif_request {
-       uint8_t        operation;    /* BLKIF_OP_???                         */
-       uint8_t        nr_segments;  /* number of segments                   */
-       blkif_vdev_t   handle;       /* only for read/write requests         */
-       uint64_t       id;           /* private guest value, echoed in resp  */
+struct blkif_request_rw {
        blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
        struct blkif_request_segment {
                grant_ref_t gref;        /* reference to I/O buffer frame        */
@@ -65,6 +61,16 @@ struct blkif_request {
        } seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
 };
 
+struct blkif_request {
+       uint8_t        operation;    /* BLKIF_OP_???                         */
+       uint8_t        nr_segments;  /* number of segments                   */
+       blkif_vdev_t   handle;       /* only for read/write requests         */
+       uint64_t       id;           /* private guest value, echoed in resp  */
+       union {
+               struct blkif_request_rw rw;
+       } u;
+};
+
 struct blkif_response {
        uint64_t        id;              /* copied from request */
        uint8_t         operation;       /* copied from request */