linux-kernel - [PATCH 13/17] block: move rq->start_time initialization to blk_rq

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Message-Id: <1237170540-19130-14-git-send-email-tj@kernel.org>
Date:	Mon, 16 Mar 2009 11:28:56 +0900
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, linux-kernel@...r.kernel.org, bzolnier@...il.com
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 13/17] block: move rq->start_time initialization to blk_rq_init()

Impact: rq->start_time is valid for all requests

rq->start_time was initialized in init_request_from_bio() so special
requests didn't have start_time set.  This has been okay as start_time
has been used only for fs requests; however, there is no indication of
this actually is the case or not.  Set rq->start_time in blk_rq_init()
and guarantee that all initialized rq's have its start_time set.  This
improves consistency at virtually no cost and future changes will make
use of the timestamp for !bio requests.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 block/blk-core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index b1781dd..7d0ab48 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -134,6 +134,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
 	rq->cmd = rq->__cmd;
 	rq->tag = -1;
 	rq->ref_count = 1;
+	rq->start_time = jiffies;
 }
 EXPORT_SYMBOL(blk_rq_init);
 
@@ -1094,7 +1095,6 @@ void init_request_from_bio(struct request *req, struct bio *bio)
 	req->errors = 0;
 	req->hard_sector = req->sector = bio->bi_sector;
 	req->ioprio = bio_prio(bio);
-	req->start_time = jiffies;
 	blk_rq_bio_prep(req->q, req, bio);
 }
 
-- 
1.6.0.2

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