From: Jens Axboe <axboe@suse.de>
Date: Wed, 12 Jul 2006 12:04:37 +0000 (+0200)
Subject: [PATCH] Add one more pointer to struct request for IO scheduler usage
X-Git-Tag: v2.6.19-rc1~640^2~53
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff7d145fd911266ae42af7552edc32681c01addb;p=linux-2.6

[PATCH] Add one more pointer to struct request for IO scheduler usage

Then we have enough room in the request to get rid of the dynamic
allocations in CFQ/AS.

Signed-off-by: Jens Axboe <axboe@suse.de>
---

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 55ef6efe3e..d2dc17151f 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -232,7 +232,13 @@ struct request {
 	struct hlist_node hash;	/* merge hash */
 	struct rb_node rb_node;	/* sort/lookup */
 
+	/*
+	 * two pointers are available for the IO schedulers, if they need
+	 * more they have to dynamically allocate it.
+	 */
 	void *elevator_private;
+	void *elevator_private2;
+
 	void *completion_data;
 
 	int rq_status;	/* should split this into a few status bits */