virtio_blk: use a wrapper function to access io context information of IO requests

struct request has an ioprio member but it is never updated because
currently bios do not hold io context information. The implication of
this is that virtio_blk ends up passing useless information to the
backend driver.

That said, some IO schedulers such as CFQ do store io context
information in struct request, but use private members for that, which
means that that information cannot be directly accessed in a IO
scheduler-independent way.

This patch adds a function to obtain the ioprio of a request. We should
avoid accessing ioprio directly and use this function instead, so that
its users do not have to care about future changes in block layer
structures or what the currently active IO controller is.

This patch does not introduce any functional changes but paves the way
for future clean-ups and enhancements.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 42251095134fa7746e8748150089c2dd570d21d8..879506a2c2342058499130351d2abb42c491ed56 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -84,11 +84,11 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
        if (blk_fs_request(vbr->req)) {
                vbr->out_hdr.type = 0;
                vbr->out_hdr.sector = vbr->req->sector;
-               vbr->out_hdr.ioprio = vbr->req->ioprio;
+               vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
        } else if (blk_pc_request(vbr->req)) {
                vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
                vbr->out_hdr.sector = 0;
-               vbr->out_hdr.ioprio = vbr->req->ioprio;
+               vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
        } else {
                /* We don't put anything else in the queue. */
                BUG();

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f131776f029e6c22b57099b42be34c7dc191e65c..490ce458b031b061dc1b33de0103c7d2cc1eb1fa 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -232,6 +232,11 @@ struct request {
        struct request *next_rq;
 };
 
+static inline unsigned short req_get_ioprio(struct request *req)
+{
+       return req->ioprio;
+}
+
 /*
  * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
  * requests. Some step values could eventually be made generic.