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

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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 <[email protected]>
Acked-by: Rusty Russell <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Fernando Luis Vázquez Cao 2008-08-14 09:59:13 +02:00 • committed by Jens Axboe
commit 766ca4428d
2 changed files with 7 additions and 2 deletions
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4
drivers/block/virtio_blk.c
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@ -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();