linux-kernel - [PATCH 1/3] block: change virtio

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Message-Id: <20080111.165018.88470085.k-ueda@ct.jp.nec.com>
Date:	Fri, 11 Jan 2008 16:50:18 -0500 (EST)
From:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
To:	jens.axboe@...cle.com
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org,
	j-nomura@...jp.nec.com, k-ueda@...jp.nec.com
Subject: [PATCH 1/3] block: change virtio_blk to use blk-end-request

This patch converts virtio_blk to use __blk_end_request() directly
so that end_{queued|dequeued}_request() can be removed.
Related 'uptodate' argument is converted to 'error'.

__blk_end_request() takes care of dequeueing request like below:

	if (!list_empty(&rq->queuelist))
		blkdev_dequeue_request(rq);

In the case of virtio_blk, blkdev_dequeue_request() has been done
in do_virtblk_request() and the queuelist is empty in blk_done().
So __blk_end_request() doesn't call blkdev_dequeue_request() and
the behavior of blk_done() doesn't change.

Cc: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Kiyoshi Ueda <k-ueda@...jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
---
 drivers/block/virtio_blk.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

Index: 2.6.24-rc7/drivers/block/virtio_blk.c
===================================================================
--- 2.6.24-rc7.orig/drivers/block/virtio_blk.c
+++ 2.6.24-rc7/drivers/block/virtio_blk.c
@@ -45,20 +45,20 @@ static bool blk_done(struct virtqueue *v
 
 	spin_lock_irqsave(&vblk->lock, flags);
 	while ((vbr = vblk->vq->vq_ops->get_buf(vblk->vq, &len)) != NULL) {
-		int uptodate;
+		int error;
 		switch (vbr->in_hdr.status) {
 		case VIRTIO_BLK_S_OK:
-			uptodate = 1;
+			error = 0;
 			break;
 		case VIRTIO_BLK_S_UNSUPP:
-			uptodate = -ENOTTY;
+			error = -ENOTTY;
 			break;
 		default:
-			uptodate = 0;
+			error = -EIO;
 			break;
 		}
 
-		end_dequeued_request(vbr->req, uptodate);
+		__blk_end_request(vbr->req, error, blk_rq_bytes(vbr->req));
 		list_del(&vbr->list);
 		mempool_free(vbr, vblk->pool);
 	}
--
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