diff options
Diffstat (limited to 'block/blk-cgroup.h')
| -rw-r--r-- | block/blk-cgroup.h | 108 |
1 files changed, 52 insertions, 56 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index c524267e4f7f..b347aa08d166 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -38,15 +38,15 @@ enum blkg_rwstat_type { }; struct blkio_cgroup { - struct cgroup_subsys_state css; - spinlock_t lock; - struct hlist_head blkg_list; + struct cgroup_subsys_state css; + spinlock_t lock; + struct hlist_head blkg_list; /* for policies to test whether associated blkcg has changed */ - uint64_t id; + uint64_t id; /* TODO: per-policy storage in blkio_cgroup */ - unsigned int cfq_weight; /* belongs to cfq */ + unsigned int cfq_weight; /* belongs to cfq */ }; struct blkg_stat { @@ -62,27 +62,27 @@ struct blkg_rwstat { /* per-blkg per-policy data */ struct blkg_policy_data { /* the blkg this per-policy data belongs to */ - struct blkio_group *blkg; + struct blkio_group *blkg; /* used during policy activation */ - struct list_head alloc_node; + struct list_head alloc_node; /* pol->pdata_size bytes of private data used by policy impl */ - char pdata[] __aligned(__alignof__(unsigned long long)); + char pdata[] __aligned(__alignof__(unsigned long long)); }; struct blkio_group { /* Pointer to the associated request_queue */ - struct request_queue *q; - struct list_head q_node; - struct hlist_node blkcg_node; - struct blkio_cgroup *blkcg; + struct request_queue *q; + struct list_head q_node; + struct hlist_node blkcg_node; + struct blkio_cgroup *blkcg; /* reference count */ - int refcnt; + int refcnt; - struct blkg_policy_data *pd[BLKCG_MAX_POLS]; + struct blkg_policy_data *pd[BLKCG_MAX_POLS]; - struct rcu_head rcu_head; + struct rcu_head rcu_head; }; typedef void (blkio_init_group_fn)(struct blkio_group *blkg); @@ -90,29 +90,39 @@ typedef void (blkio_exit_group_fn)(struct blkio_group *blkg); typedef void (blkio_reset_group_stats_fn)(struct blkio_group *blkg); struct blkio_policy_ops { - blkio_init_group_fn *blkio_init_group_fn; - blkio_exit_group_fn *blkio_exit_group_fn; - blkio_reset_group_stats_fn *blkio_reset_group_stats_fn; + blkio_init_group_fn *blkio_init_group_fn; + blkio_exit_group_fn *blkio_exit_group_fn; + blkio_reset_group_stats_fn *blkio_reset_group_stats_fn; }; struct blkio_policy_type { - struct blkio_policy_ops ops; - int plid; - size_t pdata_size; /* policy specific private data size */ - struct cftype *cftypes; /* cgroup files for the policy */ + struct blkio_policy_ops ops; + int plid; + /* policy specific private data size */ + size_t pdata_size; + /* cgroup files for the policy */ + struct cftype *cftypes; }; -extern int blkcg_init_queue(struct request_queue *q); -extern void blkcg_drain_queue(struct request_queue *q); -extern void blkcg_exit_queue(struct request_queue *q); +extern struct blkio_cgroup blkio_root_cgroup; + +struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); +struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio); +struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, + struct request_queue *q); +struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg, + struct request_queue *q); +int blkcg_init_queue(struct request_queue *q); +void blkcg_drain_queue(struct request_queue *q); +void blkcg_exit_queue(struct request_queue *q); /* Blkio controller policy registration */ -extern int blkio_policy_register(struct blkio_policy_type *); -extern void blkio_policy_unregister(struct blkio_policy_type *); -extern int blkcg_activate_policy(struct request_queue *q, - const struct blkio_policy_type *pol); -extern void blkcg_deactivate_policy(struct request_queue *q, - const struct blkio_policy_type *pol); +int blkio_policy_register(struct blkio_policy_type *); +void blkio_policy_unregister(struct blkio_policy_type *); +int blkcg_activate_policy(struct request_queue *q, + const struct blkio_policy_type *pol); +void blkcg_deactivate_policy(struct request_queue *q, + const struct blkio_policy_type *pol); void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg, u64 (*prfill)(struct seq_file *, void *, int), @@ -125,9 +135,9 @@ u64 blkg_prfill_stat(struct seq_file *sf, void *pdata, int off); u64 blkg_prfill_rwstat(struct seq_file *sf, void *pdata, int off); struct blkg_conf_ctx { - struct gendisk *disk; - struct blkio_group *blkg; - u64 v; + struct gendisk *disk; + struct blkio_group *blkg; + u64 v; }; int blkg_conf_prep(struct blkio_cgroup *blkcg, @@ -329,7 +339,9 @@ static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat) memset(rwstat->cnt, 0, sizeof(rwstat->cnt)); } -#else +#else /* CONFIG_BLK_CGROUP */ + +struct cgroup; struct blkio_group { }; @@ -337,6 +349,9 @@ struct blkio_group { struct blkio_policy_type { }; +static inline struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } +static inline struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio) { return NULL; } +static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, void *key) { return NULL; } static inline int blkcg_init_queue(struct request_queue *q) { return 0; } static inline void blkcg_drain_queue(struct request_queue *q) { } static inline void blkcg_exit_queue(struct request_queue *q) { } @@ -355,24 +370,5 @@ static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } static inline void blkg_get(struct blkio_group *blkg) { } static inline void blkg_put(struct blkio_group *blkg) { } -#endif - -#ifdef CONFIG_BLK_CGROUP -extern struct blkio_cgroup blkio_root_cgroup; -extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); -extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio); -extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, - struct request_queue *q); -struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg, - struct request_queue *q); -#else -struct cgroup; -static inline struct blkio_cgroup * -cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } -static inline struct blkio_cgroup * -bio_blkio_cgroup(struct bio *bio) { return NULL; } - -static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, - void *key) { return NULL; } -#endif -#endif /* _BLK_CGROUP_H */ +#endif /* CONFIG_BLK_CGROUP */ +#endif /* _BLK_CGROUP_H */ |