linux-kernel - [PATCH 07/12] ubd: drop unnecessary rq->sector manipulation

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Date:	Thu, 23 Apr 2009 21:25:48 +0900
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, linux-kernel@...r.kernel.org, joerg@...chain.net,
	geert@...ux-m68k.org, donari75@...il.com, davem@...emloft.net,
	jdike@...ux.intel.com, benh@...nel.crashing.org,
	Laurent@...vier.info
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 07/12] ubd: drop unnecessary rq->sector manipulation

ubd curiously updates rq->sector while issuing the request in multiple
pieces.  Don't do it and simply use local copy of sector.

[ Impact: cleanup ]

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jeff Dike <jdike@...ux.intel.com>
---
 arch/um/drivers/ubd_kern.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 36ca9fa..d100af4 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1222,7 +1222,8 @@ static void do_ubd_request(struct request_queue *q)
 {
 	struct io_thread_req *io_req;
 	struct request *req;
-	int n, last_sectors;
+	sector_t sector;
+	int n;
 
 	while(1){
 		struct ubd *dev = q->queuedata;
@@ -1238,11 +1239,10 @@ static void do_ubd_request(struct request_queue *q)
 		}
 
 		req = dev->request;
-		last_sectors = 0;
+		sector = rq->sector;
 		while(dev->start_sg < dev->end_sg){
 			struct scatterlist *sg = &dev->sg[dev->start_sg];
 
-			req->sector += last_sectors;
 			io_req = kmalloc(sizeof(struct io_thread_req),
 					 GFP_ATOMIC);
 			if(io_req == NULL){
@@ -1251,10 +1251,10 @@ static void do_ubd_request(struct request_queue *q)
 				return;
 			}
 			prepare_request(req, io_req,
-					(unsigned long long) req->sector << 9,
+					(unsigned long long)sector << 9,
 					sg->offset, sg->length, sg_page(sg));
 
-			last_sectors = sg->length >> 9;
+			sector += sg->length >> 9;
 			n = os_write_file(thread_fd, &io_req,
 					  sizeof(struct io_thread_req *));
 			if(n != sizeof(struct io_thread_req *)){
-- 
1.6.0.2

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