diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.c | 32 | ||||
| -rw-r--r-- | block/blk-cgroup.h | 1 |
2 files changed, 17 insertions, 16 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 9449c383b7b..af665fe7f4f 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -24,9 +24,7 @@ #define MAX_KEY_LEN 100 -static DEFINE_SPINLOCK(blkio_list_lock); -static LIST_HEAD(blkio_list); - +static DEFINE_MUTEX(blkcg_pol_mutex); static DEFINE_MUTEX(all_q_mutex); static LIST_HEAD(all_q_list); @@ -311,8 +309,9 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); struct blkio_group *blkg; struct hlist_node *n; + int i; - spin_lock(&blkio_list_lock); + mutex_lock(&blkcg_pol_mutex); spin_lock_irq(&blkcg->lock); /* @@ -321,15 +320,16 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) * anyway. If you get hit by a race, retry. */ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { - struct blkio_policy_type *pol; + for (i = 0; i < BLKIO_NR_POLICIES; i++) { + struct blkio_policy_type *pol = blkio_policy[i]; - list_for_each_entry(pol, &blkio_list, list) - if (pol->ops.blkio_reset_group_stats_fn) + if (pol && pol->ops.blkio_reset_group_stats_fn) pol->ops.blkio_reset_group_stats_fn(blkg); + } } spin_unlock_irq(&blkcg->lock); - spin_unlock(&blkio_list_lock); + mutex_unlock(&blkcg_pol_mutex); return 0; } @@ -732,20 +732,21 @@ void blkio_policy_register(struct blkio_policy_type *blkiop) { struct request_queue *q; + mutex_lock(&blkcg_pol_mutex); + blkcg_bypass_start(); - spin_lock(&blkio_list_lock); BUG_ON(blkio_policy[blkiop->plid]); blkio_policy[blkiop->plid] = blkiop; - list_add_tail(&blkiop->list, &blkio_list); - - spin_unlock(&blkio_list_lock); list_for_each_entry(q, &all_q_list, all_q_node) update_root_blkg_pd(q, blkiop->plid); + blkcg_bypass_end(); if (blkiop->cftypes) WARN_ON(cgroup_add_cftypes(&blkio_subsys, blkiop->cftypes)); + + mutex_unlock(&blkcg_pol_mutex); } EXPORT_SYMBOL_GPL(blkio_policy_register); @@ -753,19 +754,20 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop) { struct request_queue *q; + mutex_lock(&blkcg_pol_mutex); + if (blkiop->cftypes) cgroup_rm_cftypes(&blkio_subsys, blkiop->cftypes); blkcg_bypass_start(); - spin_lock(&blkio_list_lock); BUG_ON(blkio_policy[blkiop->plid] != blkiop); blkio_policy[blkiop->plid] = NULL; - list_del_init(&blkiop->list); - spin_unlock(&blkio_list_lock); list_for_each_entry(q, &all_q_list, all_q_node) update_root_blkg_pd(q, blkiop->plid); blkcg_bypass_end(); + + mutex_unlock(&blkcg_pol_mutex); } EXPORT_SYMBOL_GPL(blkio_policy_unregister); diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 64392ac76ce..c772581c901 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -102,7 +102,6 @@ struct blkio_policy_ops { }; struct blkio_policy_type { - struct list_head list; struct blkio_policy_ops ops; enum blkio_policy_id plid; size_t pdata_size; /* policy specific private data size */ |