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blkcg: remove unnecessary blkcg_root handling from css_alloc/free paths

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blkcg_css_alloc() bypasses policy data allocation and blkcg_css_free()
bypasses policy data and blkcg freeing for blkcg_root.  There's no
reason to to treat policy data any differently for blkcg_root.  If the
root css gets allocated after policies are registered, policy
registration path will add policy data; otherwise, the alloc path
will.  The free path isn't never invoked for root csses.

This patch removes the unnecessary special handling of blkcg_root from
css_alloc/free paths.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-08-18 14:55:08 -07:00 committed by Jens Axboe
parent 994b783274
commit bc915e61cd
1 changed files with 10 additions and 15 deletions
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25
block/blk-cgroup.c
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@ -823,18 +823,15 @@ static void blkcg_css_offline(struct cgroup_subsys_state *css)
static void blkcg_css_free(struct cgroup_subsys_state *css)
{
struct blkcg *blkcg = css_to_blkcg(css);
int i;
mutex_lock(&blkcg_pol_mutex);
list_del(&blkcg->all_blkcgs_node);
mutex_unlock(&blkcg_pol_mutex);
if (blkcg != &blkcg_root) {
int i;
for (i = 0; i < BLKCG_MAX_POLS; i++)
kfree(blkcg->pd[i]);
kfree(blkcg);
}
for (i = 0; i < BLKCG_MAX_POLS; i++)
kfree(blkcg->pd[i]);
kfree(blkcg);
}
static struct cgroup_subsys_state *
@ -848,13 +845,12 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
if (!parent_css) {
blkcg = &blkcg_root;
goto done;
}
blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);
if (!blkcg) {
ret = ERR_PTR(-ENOMEM);
goto free_blkcg;
} else {
blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);
if (!blkcg) {
ret = ERR_PTR(-ENOMEM);
goto free_blkcg;
}
}
for (i = 0; i < BLKCG_MAX_POLS ; i++) {
@ -881,7 +877,6 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
pol->cpd_init_fn(blkcg);
}
done:
spin_lock_init(&blkcg->lock);
INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_NOWAIT);
INIT_HLIST_HEAD(&blkcg->blkg_list);