diff options
| author | Tejun Heo <tj@kernel.org> | 2015-08-18 14:55:14 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-08-18 15:49:17 -0700 |
| commit | a9520cd6f2ac1fbbf206b915946534c6dddbaae2 (patch) | |
| tree | 906dbb619ff1c078486a2fad514d3427aeec6250 /block/blk-cgroup.c | |
| parent | b2ce2643cc705aa9043642d7b6248ccfd8e20629 (diff) | |
| download | lwn-a9520cd6f2ac1fbbf206b915946534c6dddbaae2.tar.gz lwn-a9520cd6f2ac1fbbf206b915946534c6dddbaae2.zip | |
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 <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 18 |
1 files changed, 8 insertions, 10 deletions
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; } |