linux-kernel - [PATCH 12/18] xd: dequeue in-flight request

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Date:	Fri,  8 May 2009 11:54:10 +0900
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, rusty@...tcorp.com.au,
	James.Bottomley@...senPartnership.com, mike.miller@...com,
	donari75@...il.com, paul.clements@...eleye.com, tim@...erelk.net,
	Geert.Uytterhoeven@...ycom.com, davem@...emloft.net,
	Laurent@...vier.info, jgarzik@...ox.com, jeremy@...source.com,
	grant.likely@...retlab.ca, adrian@...en.demon.co.uk,
	sfr@...b.auug.org.au, bzolnier@...il.com, petkovbb@...glemail.com,
	sshtylyov@...mvista.com, oakad@...oo.com, drzeus@...eus.cx,
	dwmw2@...radead.org, Markus.Lidel@...dowconnect.com,
	wein@...ibm.com, schwidefsky@...ibm.com, zaitcev@...hat.com,
	fujita.tomonori@....ntt.co.jp, axboe@...nel.dk
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 12/18] xd: dequeue in-flight request

xd processes requests one-by-one synchronously and can be easily
converted to dequeueing model.  Convert it.

While at it, use rq_cur_bytes instead of rq_bytes when checking for
sector overflow.  This is for for consistency and better behavior for
merged requests.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 drivers/block/xd.c |   29 +++++++++++++++++------------
 1 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 4ef8801..d4c4352 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -305,26 +305,31 @@ static void do_xd_request (struct request_queue * q)
 	if (xdc_busy)
 		return;
 
-	while ((req = elv_next_request(q)) != NULL) {
+	req = elv_next_request(q);
+	if (req)
+		blkdev_dequeue_request(req);
+
+	while (req) {
 		unsigned block = blk_rq_pos(req);
-		unsigned count = blk_rq_sectors(req);
+		unsigned count = blk_rq_cur_sectors(req);
 		XD_INFO *disk = req->rq_disk->private_data;
-		int res = 0;
+		int res = -EIO;
 		int retry;
 
-		if (!blk_fs_request(req)) {
-			__blk_end_request_cur(req, -EIO);
-			continue;
-		}
-		if (block + count > get_capacity(req->rq_disk)) {
-			__blk_end_request_cur(req, -EIO);
-			continue;
-		}
+		if (!blk_fs_request(req))
+			goto done;
+		if (block + count > get_capacity(req->rq_disk))
+			goto done;
 		for (retry = 0; (retry < XD_RETRIES) && !res; retry++)
 			res = xd_readwrite(rq_data_dir(req), disk, req->buffer,
 					   block, count);
+	done:
 		/* wrap up, 0 = success, -errno = fail */
-		__blk_end_request_cur(req, res);
+		if (!__blk_end_request_cur(req, res)) {
+			req = elv_next_request(q);
+			if (req)
+				blkdev_dequeue_request(req);
+		}
 	}
 }
 
-- 
1.6.0.2

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