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authorTejun Heo <tj@kernel.org>2012-03-05 13:15:18 -0800
committerJens Axboe <axboe@kernel.dk>2012-03-06 21:27:23 +0100
commit4eef3049986e8397d5003916aed8cad6567a5e02 (patch)
tree5e36431986907b9fa728a6fbeb819a2738a64c82 /include/linux/blkdev.h
parentc1768268f9424410761da57ea71107acae7b03cc (diff)
downloadvexpress-lsk-4eef3049986e8397d5003916aed8cad6567a5e02.tar.gz
blkcg: move per-queue blkg list heads and counters to queue and blkg
Currently, specific policy implementations are responsible for maintaining list and number of blkgs. This duplicates code unnecessarily, and hinders factoring common code and providing blkcg API with better defined semantics. After this patch, request_queue hosts list heads and counters and blkg has list nodes for both policies. This patch only relocates the necessary fields and the next patch will actually move management code into blkcg core. Note that request_queue->blkg_list[] and ->nr_blkgs[] are hardcoded to have 2 elements. This is to avoid include dependency and will be removed by the next patch. This patch doesn't introduce any behavior change. -v2: Now unnecessary conditional on CONFIG_BLK_CGROUP_MODULE removed as pointed out by Vivek. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e8c0bbd06b9..f4e35edea70 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -362,6 +362,11 @@ struct request_queue {
struct list_head timeout_list;
struct list_head icq_list;
+#ifdef CONFIG_BLK_CGROUP
+ /* XXX: array size hardcoded to avoid include dependency (temporary) */
+ struct list_head blkg_list[2];
+ int nr_blkgs[2];
+#endif
struct queue_limits limits;