linux-kernel - [PATCH 09/18] ps3disk: dequeue in-flight request

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Date:	Fri,  8 May 2009 11:54:07 +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 09/18] ps3disk: dequeue in-flight request

Other than in issue error paths, ps3disk always completely finishes
fetched requests.  With full completion on error paths, it can be
easily converted to dequeueing model.

* After L1 r/w call failure, ps3disk_submit_request_sg() now fails the
  whole request.  Issue failure isn't likely to benefit from partial
  retry anyway and ps3disk uses full failure in completion error path
  too, so I don't think this amounts to any meaningful functionality
  loss.

* flush completion is converted to _all for consistency.  It doesn't
  make any functional difference.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
---
 drivers/block/ps3disk.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index 8d58308..f4d8db9 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -157,7 +157,7 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
 	if (res) {
 		dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
 			__LINE__, op, res);
-		__blk_end_request_cur(req, -EIO);
+		__blk_end_request_all(req, -EIO);
 		return 0;
 	}
 
@@ -179,7 +179,7 @@ static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
 	if (res) {
 		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
 			__func__, __LINE__, res);
-		__blk_end_request_cur(req, -EIO);
+		__blk_end_request_all(req, -EIO);
 		return 0;
 	}
 
@@ -195,6 +195,8 @@ static void ps3disk_do_request(struct ps3_storage_device *dev,
 	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 
 	while ((req = elv_next_request(q))) {
+		blkdev_dequeue_request(req);
+
 		if (blk_fs_request(req)) {
 			if (ps3disk_submit_request_sg(dev, req))
 				break;
@@ -204,7 +206,7 @@ static void ps3disk_do_request(struct ps3_storage_device *dev,
 				break;
 		} else {
 			blk_dump_rq_flags(req, DEVICE_NAME " bad request");
-			__blk_end_request_cur(req, -EIO);
+			__blk_end_request_all(req, -EIO);
 			continue;
 		}
 	}
-- 
1.6.0.2

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