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authorTejun Heo <tj@kernel.org>2012-03-05 13:15:05 -0800
committerJens Axboe <axboe@kernel.dk>2012-03-06 21:27:22 +0100
commitf51b802c17e2a21926b29911493f5e7ddf6eee87 (patch)
treec32d9ea2a61201b0c6bf59b349300af04dbc3686 /block/blk-core.c
parent035d10b2fa7e5f7e9bf9465dbc39c35affd5ac32 (diff)
downloadop-kernel-dev-f51b802c17e2a21926b29911493f5e7ddf6eee87.zip
op-kernel-dev-f51b802c17e2a21926b29911493f5e7ddf6eee87.tar.gz
blkcg: use the usual get blkg path for root blkio_group
For root blkg, blk_throtl_init() was using throtl_alloc_tg() explicitly and cfq_init_queue() was manually initializing embedded cfqd->root_group, adding unnecessarily different code paths to blkg handling. Make both use the usual blkio_group get functions - throtl_get_tg() and cfq_get_cfqg() - for the root blkio_group too. Note that blk_throtl_init() callsite is pushed downwards in blk_alloc_queue_node() so that @q is sufficiently initialized for throtl_get_tg(). This simplifies root blkg handling noticeably for cfq and will allow further modularization of blkcg API. -v2: Vivek pointed out that using cfq_get_cfqg() won't work if CONFIG_CFQ_GROUP_IOSCHED is disabled. Fix it by factoring out initialization of base part of cfqg into cfq_init_cfqg_base() and alloc/init/free explicitly if !CONFIG_CFQ_GROUP_IOSCHED. 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 'block/blk-core.c')
-rw-r--r--block/blk-core.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 7713c73..5a1b8cc 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -540,9 +540,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
if (err)
goto fail_id;
- if (blk_throtl_init(q))
- goto fail_id;
-
setup_timer(&q->backing_dev_info.laptop_mode_wb_timer,
laptop_mode_timer_fn, (unsigned long) q);
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
@@ -565,6 +562,9 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
*/
q->queue_lock = &q->__queue_lock;
+ if (blk_throtl_init(q))
+ goto fail_id;
+
return q;
fail_id:
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