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blk-throttle: clean up blkg_policy_data alloc/init/exit/free methods

Browse source 
With the recent addition of alloc and free methods, things became
messier.  This patch reorganizes them according to the followings.

* ->pd_alloc_fn()

  Responsible for allocation and static initializations - the ones
  which can be done independent of where the pd might be attached.

* ->pd_init_fn()

  Initializations which require the knowledge of where the pd is
  attached.

* ->pd_free_fn()

  The counter part of pd_alloc_fn().  Static de-init and freeing.

This leaves ->pd_exit_fn() without any users.  Removed.

While at it, collapse an one liner function throtl_pd_exit(), which
has only one user, into its user.

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 2015-08-18 14:55:13 -07:00 • committed by Jens Axboe
commit b2ce2643cc
4 changed files with 31 additions and 54 deletions
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11
block/blk-cgroup.c
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@ -402,15 +402,6 @@ static void blkg_destroy_all(struct request_queue *q)
void __blkg_release_rcu(struct rcu_head *rcu_head)
{
struct blkcg_gq *blkg = container_of(rcu_head, struct blkcg_gq, rcu_head);
int i;
/* tell policies that this one is being freed */
for (i = 0; i < BLKCG_MAX_POLS; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
if (blkg->pd[i] && pol->pd_exit_fn)
pol->pd_exit_fn(blkg);
}
/* release the blkcg and parent blkg refs this blkg has been holding */
css_put(&blkg->blkcg->css);
@ -1127,8 +1118,6 @@ void blkcg_deactivate_policy(struct request_queue *q,
if (pol->pd_offline_fn)
pol->pd_offline_fn(blkg);
if (pol->pd_exit_fn)
pol->pd_exit_fn(blkg);
if (blkg->pd[pol->plid]) {
pol->pd_free_fn(blkg->pd[pol->plid]);