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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-10-12 12:12:36 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-11-18 13:27:59 -0500
commit97e36834f5a106459ab1b290e663a4eb6264639e (patch)
tree39e4843998cb7f75b94d80f27e4b11ffb3662f28 /include/xen
parentcfcfc9eca2bcbd26a8e206baeb005b055dbf8e37 (diff)
downloadop-kernel-dev-97e36834f5a106459ab1b290e663a4eb6264639e.zip
op-kernel-dev-97e36834f5a106459ab1b290e663a4eb6264639e.tar.gz
xen/blk[front|back]: Squash blkif_request_rw and blkif_request_discard together
In a union type structure to deal with the overlapping attributes in a easier manner. Suggested-by: Ian Campbell <Ian.Campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/interface/io/blkif.h24
1 files changed, 17 insertions, 7 deletions
diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h
index 9324488..f88e28b 100644
--- a/include/xen/interface/io/blkif.h
+++ b/include/xen/interface/io/blkif.h
@@ -95,6 +95,12 @@ typedef uint64_t blkif_sector_t;
#define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
struct blkif_request_rw {
+ uint8_t nr_segments; /* number of segments */
+ blkif_vdev_t handle; /* only for read/write requests */
+#ifdef CONFIG_X86_64
+ uint32_t _pad1; /* offsetof(blkif_request,u.rw.id) == 8 */
+#endif
+ uint64_t id; /* private guest value, echoed in resp */
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 */
@@ -102,23 +108,27 @@ struct blkif_request_rw {
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
} seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
-};
+} __attribute__((__packed__));
struct blkif_request_discard {
+ uint8_t nr_segments; /* number of segments */
+ blkif_vdev_t _pad1; /* only for read/write requests */
+#ifdef CONFIG_X86_64
+ uint32_t _pad2; /* offsetof(blkif_req..,u.discard.id)==8*/
+#endif
+ uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;
- uint64_t nr_sectors;
-};
+ uint64_t nr_sectors;
+ uint8_t _pad3;
+} __attribute__((__packed__));
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;
struct blkif_request_discard discard;
} u;
-};
+} __attribute__((__packed__));
struct blkif_response {
uint64_t id; /* copied from request */
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