mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-24 09:50:04 +00:00
Code Issues Releases Wiki Activity

xen: Union the blkif_request request specific fields

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/block/xen-blkfront.c
View file

@ -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));

16
include/xen/interface/io/blkif.h
View file

@ -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 */