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blkcg: minor updates around blkcg_policy_data

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* Rename blkcg->pd[] to blkcg->cpd[] so that cpd is consistently used
  for blkcg_policy_data.

* Make blkcg_policy->cpd_init_fn() take blkcg_policy_data instead of
  blkcg.  This makes it consistent with blkg_policy_data methods and
  to-be-added cpd alloc/free methods.

* blkcg_policy_data->blkcg and cpd_to_blkcg() added so that
  cpd_init_fn() can determine the associated blkcg from
  blkcg_policy_data.

v2: blkcg_policy_data->blkcg initializations were missing.  Added.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Arianna Avanzini <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2015-08-18 14:55:15 -07:00 • committed by Jens Axboe
commit 814376483e
3 changed files with 28 additions and 21 deletions
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24
block/blk-cgroup.c
View file

@ -821,7 +821,7 @@ static void blkcg_css_free(struct cgroup_subsys_state *css)
mutex_unlock(&blkcg_pol_mutex);
for (i = 0; i < BLKCG_MAX_POLS; i++)
kfree(blkcg->pd[i]);
kfree(blkcg->cpd[i]);
kfree(blkcg);
}
@ -857,15 +857,16 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
if (!pol || !pol->cpd_size)
continue;
BUG_ON(blkcg->pd[i]);
BUG_ON(blkcg->cpd[i]);
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
if (!cpd) {
ret = ERR_PTR(-ENOMEM);
goto free_pd_blkcg;
}
blkcg->pd[i] = cpd;
blkcg->cpd[i] = cpd;
cpd->blkcg = blkcg;
cpd->plid = i;
pol->cpd_init_fn(blkcg);
pol->cpd_init_fn(cpd);
}
spin_lock_init(&blkcg->lock);
@ -881,7 +882,7 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
free_pd_blkcg:
for (i--; i >= 0; i--)
kfree(blkcg->pd[i]);
kfree(blkcg->cpd[i]);
free_blkcg:
kfree(blkcg);
mutex_unlock(&blkcg_pol_mutex);
@ -1168,9 +1169,10 @@ int blkcg_policy_register(struct blkcg_policy *pol)
goto err_free_cpds;
}
blkcg->pd[pol->plid] = cpd;
blkcg->cpd[pol->plid] = cpd;
cpd->blkcg = blkcg;
cpd->plid = pol->plid;
pol->cpd_init_fn(blkcg);
pol->cpd_init_fn(cpd);
}
}
@ -1186,8 +1188,8 @@ int blkcg_policy_register(struct blkcg_policy *pol)
err_free_cpds:
if (pol->cpd_size) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
kfree(blkcg->pd[pol->plid]);
blkcg->pd[pol->plid] = NULL;
kfree(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
}
}
blkcg_policy[pol->plid] = NULL;
@ -1222,8 +1224,8 @@ void blkcg_policy_unregister(struct blkcg_policy *pol)
if (pol->cpd_size) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
kfree(blkcg->pd[pol->plid]);
blkcg->pd[pol->plid] = NULL;
kfree(blkcg->cpd[pol->plid]);
blkcg->cpd[pol->plid] = NULL;
}
}
blkcg_policy[pol->plid] = NULL;