linux-kernel - [RFC][patch 5/11][CFQ-cgroup] Add cfq optional operation framework

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Date:	Tue, 1 Apr 2008 18:35:05 +0900
From:	"Satoshi UCHIDA" <s-uchida@...jp.nec.com>
To:	<linux-kernel@...r.kernel.org>,
	<containers@...ts.linux-foundation.org>, <axboe@...nel.dk>,
	<menage@...gle.com>
Cc:	<s-uchida@...jp.nec.com>, <tom-sugawara@...jp.nec.com>,
	<m-takahashi@...jp.nec.com>
Subject: [RFC][patch 5/11][CFQ-cgroup] Add cfq optional operation framework

This patch creates a cfq optional operations framework.
This framework defines specific functions for expanding CFQ.

    Signed-off-by: Satoshi UCHIDA <uchida@...jp.nec.com>

diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
index b5303d9..95663f9 100644
--- a/block/cfq-cgroup.c
+++ b/block/cfq-cgroup.c
@@ -151,3 +151,7 @@ struct cgroup_subsys cfq_cgroup_subsys = {
 	.subsys_id = cfq_cgroup_subsys_id,
 	.populate = cfq_cgroup_populate,
 };
+
+
+struct cfq_ops opt = {
+};
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index aaf5d7e..245c252 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2233,6 +2233,11 @@ static void __exit cfq_exit(void)
 module_init(cfq_init);
 module_exit(cfq_exit);
 
+#ifndef CONFIG_CGROUP_CFQ
+struct cfq_ops opt = {
+};
+#endif
+
 MODULE_AUTHOR("Jens Axboe");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler");
diff --git a/include/linux/cfq-iosched.h b/include/linux/cfq-iosched.h
index 035bfc4..9287da1 100644
--- a/include/linux/cfq-iosched.h
+++ b/include/linux/cfq-iosched.h
@@ -87,4 +87,10 @@ static inline struct request_queue * __cfq_container_of_queue(struct work_struct
 	return cfqd->cfq_driv_d.queue;
 };
 
+struct cfq_ops
+{
+};
+
+extern struct cfq_ops opt;
+
 #endif  /* _LINUX_CFQ_IOSCHED_H */

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