diff options
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 05b893de516b..42ff436ffaf4 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -46,6 +46,8 @@ struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css; static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS]; +static LIST_HEAD(all_blkcgs); /* protected by blkcg_pol_mutex */ + static bool blkcg_policy_enabled(struct request_queue *q, const struct blkcg_policy *pol) { @@ -817,6 +819,10 @@ static void blkcg_css_free(struct cgroup_subsys_state *css) { struct blkcg *blkcg = css_to_blkcg(css); + mutex_lock(&blkcg_pol_mutex); + list_del(&blkcg->all_blkcgs_node); + mutex_unlock(&blkcg_pol_mutex); + if (blkcg != &blkcg_root) { int i; @@ -833,6 +839,8 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css) struct cgroup_subsys_state *ret; int i; + mutex_lock(&blkcg_pol_mutex); + if (!parent_css) { blkcg = &blkcg_root; goto done; @@ -844,8 +852,6 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css) goto free_blkcg; } - mutex_lock(&blkcg_pol_mutex); - for (i = 0; i < BLKCG_MAX_POLS ; i++) { struct blkcg_policy *pol = blkcg_policy[i]; struct blkcg_policy_data *cpd; @@ -862,7 +868,6 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css) BUG_ON(blkcg->pd[i]); cpd = kzalloc(pol->cpd_size, GFP_KERNEL); if (!cpd) { - mutex_unlock(&blkcg_pol_mutex); ret = ERR_PTR(-ENOMEM); goto free_pd_blkcg; } @@ -871,7 +876,6 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css) pol->cpd_init_fn(blkcg); } - mutex_unlock(&blkcg_pol_mutex); done: spin_lock_init(&blkcg->lock); INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_ATOMIC); @@ -879,14 +883,17 @@ done: #ifdef CONFIG_CGROUP_WRITEBACK INIT_LIST_HEAD(&blkcg->cgwb_list); #endif + list_add_tail(&blkcg->all_blkcgs_node, &all_blkcgs); + + mutex_unlock(&blkcg_pol_mutex); return &blkcg->css; free_pd_blkcg: for (i--; i >= 0; i--) kfree(blkcg->pd[i]); - free_blkcg: kfree(blkcg); + mutex_unlock(&blkcg_pol_mutex); return ret; } |