linux-kernel - [PATCH 1/3] Deadline iosched: Factor out finding latter request

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Date:	Tue, 30 Oct 2007 15:05:02 +1100
From:	Aaron Carroll <aaronc@...ato.unsw.edu.au>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	linux-kernel@...r.kernel.org,
	Peter Chubb <peterc@...ato.unsw.edu.au>
Subject: [PATCH 1/3] Deadline iosched: Factor out finding latter request

Factor finding the next request in sector-sorted order into
a function deadline_latter_request.

Signed-off-by: Aaron Carroll <aaronc@...ato.unsw.edu.au>
---
 block/deadline-iosched.c |   28 +++++++++++++++++-----------
 1 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index 1a511ff..a44437e 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -55,6 +55,20 @@ static void deadline_move_request(struct deadline_data *, struct request *);
 
 #define RQ_RB_ROOT(dd, rq)	(&(dd)->sort_list[rq_data_dir((rq))])
 
+/*
+ * get the request after `rq' in sector-sorted order
+ */
+static inline struct request *
+deadline_latter_request(struct request *rq)
+{
+	struct rb_node *node = rb_next(&rq->rb_node);
+
+	if (node)
+		return rb_entry_rq(node);
+
+	return NULL;
+}
+
 static void
 deadline_add_rq_rb(struct deadline_data *dd, struct request *rq)
 {
@@ -74,13 +88,8 @@ deadline_del_rq_rb(struct deadline_data *dd, struct request *rq)
 {
 	const int data_dir = rq_data_dir(rq);
 
-	if (dd->next_rq[data_dir] == rq) {
-		struct rb_node *rbnext = rb_next(&rq->rb_node);
-
-		dd->next_rq[data_dir] = NULL;
-		if (rbnext)
-			dd->next_rq[data_dir] = rb_entry_rq(rbnext);
-	}
+	if (dd->next_rq[data_dir] == rq)
+		dd->next_rq[data_dir] = deadline_latter_request(rq);
 
 	elv_rb_del(RQ_RB_ROOT(dd, rq), rq);
 }
@@ -198,14 +207,11 @@ static void
 deadline_move_request(struct deadline_data *dd, struct request *rq)
 {
 	const int data_dir = rq_data_dir(rq);
-	struct rb_node *rbnext = rb_next(&rq->rb_node);
 
 	dd->next_rq[READ] = NULL;
 	dd->next_rq[WRITE] = NULL;
+	dd->next_rq[data_dir] = deadline_latter_request(rq);
 
-	if (rbnext)
-		dd->next_rq[data_dir] = rb_entry_rq(rbnext);
-	
 	dd->last_sector = rq->sector + rq->nr_sectors;
 
 	/*
-
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