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xen: Union the blkif_request request specific fields

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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>
This commit is contained in:
Owen Smith
2010-12-22 15:05:00 +00:00
committed by Konrad Rzeszutek Wilk
parent c56eb8fb6d
commit 51de69523f
2 changed files with 15 additions and 9 deletions
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16
include/xen/interface/io/blkif.h
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@@ -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 */