From a9520cd6f2ac1fbbf206b915946534c6dddbaae2 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 18 Aug 2015 14:55:14 -0700 Subject: blkcg: make blkcg_policy methods take a pointer to blkcg_policy_data The newly added ->pd_alloc_fn() and ->pd_free_fn() deal with pd (blkg_policy_data) while the older ones use blkg (blkcg_gq). As using blkg doesn't make sense for ->pd_alloc_fn() and after allocation pd can always be mapped to blkg and given that these are policy-specific methods, it makes sense to converge on pd. This patch makes all methods deal with pd instead of blkg. Most conversions are trivial. In blk-cgroup.c, a couple method invocation sites now test whether pd exists instead of policy state for consistency. This shouldn't cause any behavioral differences. Signed-off-by: Tejun Heo Cc: Vivek Goyal Signed-off-by: Jens Axboe --- block/blk-cgroup.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) (limited to 'block/blk-cgroup.c') diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index acfb09af58a5..8343450cffe2 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -242,7 +242,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg, struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_init_fn) - pol->pd_init_fn(blkg); + pol->pd_init_fn(blkg->pd[i]); } /* insert */ @@ -256,7 +256,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg, struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_online_fn) - pol->pd_online_fn(blkg); + pol->pd_online_fn(blkg->pd[i]); } } blkg->online = true; @@ -347,7 +347,7 @@ static void blkg_destroy(struct blkcg_gq *blkg) struct blkcg_policy *pol = blkcg_policy[i]; if (blkg->pd[i] && pol->pd_offline_fn) - pol->pd_offline_fn(blkg); + pol->pd_offline_fn(blkg->pd[i]); } blkg->online = false; @@ -468,9 +468,8 @@ static int blkcg_reset_stats(struct cgroup_subsys_state *css, for (i = 0; i < BLKCG_MAX_POLS; i++) { struct blkcg_policy *pol = blkcg_policy[i]; - if (blkcg_policy_enabled(blkg->q, pol) && - pol->pd_reset_stats_fn) - pol->pd_reset_stats_fn(blkg); + if (blkg->pd[i] && pol->pd_reset_stats_fn) + pol->pd_reset_stats_fn(blkg->pd[i]); } } @@ -1076,7 +1075,7 @@ pd_prealloc: pd->blkg = blkg; pd->plid = pol->plid; if (pol->pd_init_fn) - pol->pd_init_fn(blkg); + pol->pd_init_fn(pd); } __set_bit(pol->plid, q->blkcg_pols); @@ -1116,10 +1115,9 @@ void blkcg_deactivate_policy(struct request_queue *q, /* grab blkcg lock too while removing @pd from @blkg */ spin_lock(&blkg->blkcg->lock); - if (pol->pd_offline_fn) - pol->pd_offline_fn(blkg); - if (blkg->pd[pol->plid]) { + if (pol->pd_offline_fn) + pol->pd_offline_fn(blkg->pd[pol->plid]); pol->pd_free_fn(blkg->pd[pol->plid]); blkg->pd[pol->plid] = NULL; } -- cgit v1.2.3