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blkcg: make blkcg_policy methods take a pointer to blkcg_policy_data

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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 <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2015-08-18 14:55:14 -07:00 • committed by Jens Axboe
commit a9520cd6f2
4 changed files with 26 additions and 27 deletions
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18
block/blk-cgroup.c
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@ -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;
}