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blkcg: add blkcg_{init|drain|exit}_queue()

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Currently block core calls directly into blk-throttle for init, drain
and exit.  This patch adds blkcg_{init|drain|exit}_queue() which wraps
the blk-throttle functions.  This is to give more control and
visiblity to blkcg core layer for proper layering.  Further patches
will add logic common to blkcg policies to the functions.

While at it, collapse blk_throtl_release() into blk_throtl_exit().
There's no reason to keep them separate.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2012-03-05 13:15:12 -08:00 • committed by Jens Axboe
commit 5efd611351
6 changed files with 55 additions and 10 deletions
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4
block/blk-sysfs.c
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@ -9,6 +9,7 @@
#include <linux/blktrace_api.h>
#include "blk.h"
#include "blk-cgroup.h"
struct queue_sysfs_entry {
struct attribute attr;
@ -486,7 +487,7 @@ static void blk_release_queue(struct kobject *kobj)
elevator_exit(q->elevator);
}
blk_throtl_exit(q);
blkcg_exit_queue(q);
if (rl->rq_pool)
mempool_destroy(rl->rq_pool);
@ -494,7 +495,6 @@ static void blk_release_queue(struct kobject *kobj)
if (q->queue_tags)
__blk_queue_free_tags(q);
blk_throtl_release(q);
blk_trace_shutdown(q);
bdi_destroy(&q->backing_dev_info);