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blkcg: style cleanups for blk-cgroup.h
* Update indentation on struct field declarations. * Uniformly don't use "extern" on function declarations. * Merge the two #ifdef CONFIG_BLK_CGROUP blocks. All changes in this patch are cosmetic. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
Jens Axboe
parent
54e7ed12ba
commit
36558c8a30
@ -38,15 +38,15 @@ enum blkg_rwstat_type {
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};
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struct blkio_cgroup {
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struct cgroup_subsys_state css;
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spinlock_t lock;
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struct hlist_head blkg_list;
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struct cgroup_subsys_state css;
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spinlock_t lock;
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struct hlist_head blkg_list;
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/* for policies to test whether associated blkcg has changed */
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uint64_t id;
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uint64_t id;
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/* TODO: per-policy storage in blkio_cgroup */
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unsigned int cfq_weight; /* belongs to cfq */
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unsigned int cfq_weight; /* belongs to cfq */
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};
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struct blkg_stat {
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@ -62,27 +62,27 @@ struct blkg_rwstat {
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/* per-blkg per-policy data */
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struct blkg_policy_data {
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/* the blkg this per-policy data belongs to */
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struct blkio_group *blkg;
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struct blkio_group *blkg;
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/* used during policy activation */
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struct list_head alloc_node;
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struct list_head alloc_node;
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/* pol->pdata_size bytes of private data used by policy impl */
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char pdata[] __aligned(__alignof__(unsigned long long));
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char pdata[] __aligned(__alignof__(unsigned long long));
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};
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struct blkio_group {
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/* Pointer to the associated request_queue */
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struct request_queue *q;
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struct list_head q_node;
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struct hlist_node blkcg_node;
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struct blkio_cgroup *blkcg;
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struct request_queue *q;
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struct list_head q_node;
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struct hlist_node blkcg_node;
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struct blkio_cgroup *blkcg;
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/* reference count */
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int refcnt;
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int refcnt;
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struct blkg_policy_data *pd[BLKCG_MAX_POLS];
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struct blkg_policy_data *pd[BLKCG_MAX_POLS];
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struct rcu_head rcu_head;
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struct rcu_head rcu_head;
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};
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typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
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@ -90,29 +90,39 @@ typedef void (blkio_exit_group_fn)(struct blkio_group *blkg);
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typedef void (blkio_reset_group_stats_fn)(struct blkio_group *blkg);
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struct blkio_policy_ops {
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blkio_init_group_fn *blkio_init_group_fn;
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blkio_exit_group_fn *blkio_exit_group_fn;
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blkio_reset_group_stats_fn *blkio_reset_group_stats_fn;
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blkio_init_group_fn *blkio_init_group_fn;
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blkio_exit_group_fn *blkio_exit_group_fn;
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blkio_reset_group_stats_fn *blkio_reset_group_stats_fn;
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};
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struct blkio_policy_type {
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struct blkio_policy_ops ops;
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int plid;
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size_t pdata_size; /* policy specific private data size */
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struct cftype *cftypes; /* cgroup files for the policy */
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struct blkio_policy_ops ops;
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int plid;
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/* policy specific private data size */
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size_t pdata_size;
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/* cgroup files for the policy */
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struct cftype *cftypes;
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};
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extern int blkcg_init_queue(struct request_queue *q);
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extern void blkcg_drain_queue(struct request_queue *q);
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extern void blkcg_exit_queue(struct request_queue *q);
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extern struct blkio_cgroup blkio_root_cgroup;
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struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
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struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
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struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
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struct request_queue *q);
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struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
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struct request_queue *q);
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int blkcg_init_queue(struct request_queue *q);
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void blkcg_drain_queue(struct request_queue *q);
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void blkcg_exit_queue(struct request_queue *q);
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/* Blkio controller policy registration */
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extern int blkio_policy_register(struct blkio_policy_type *);
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extern void blkio_policy_unregister(struct blkio_policy_type *);
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extern int blkcg_activate_policy(struct request_queue *q,
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const struct blkio_policy_type *pol);
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extern void blkcg_deactivate_policy(struct request_queue *q,
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const struct blkio_policy_type *pol);
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int blkio_policy_register(struct blkio_policy_type *);
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void blkio_policy_unregister(struct blkio_policy_type *);
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int blkcg_activate_policy(struct request_queue *q,
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const struct blkio_policy_type *pol);
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void blkcg_deactivate_policy(struct request_queue *q,
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const struct blkio_policy_type *pol);
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void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
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u64 (*prfill)(struct seq_file *, void *, int),
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@ -125,9 +135,9 @@ u64 blkg_prfill_stat(struct seq_file *sf, void *pdata, int off);
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u64 blkg_prfill_rwstat(struct seq_file *sf, void *pdata, int off);
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struct blkg_conf_ctx {
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struct gendisk *disk;
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struct blkio_group *blkg;
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u64 v;
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struct gendisk *disk;
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struct blkio_group *blkg;
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u64 v;
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};
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int blkg_conf_prep(struct blkio_cgroup *blkcg,
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@ -329,7 +339,9 @@ static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
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memset(rwstat->cnt, 0, sizeof(rwstat->cnt));
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}
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#else
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#else /* CONFIG_BLK_CGROUP */
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struct cgroup;
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struct blkio_group {
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};
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@ -337,6 +349,9 @@ struct blkio_group {
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struct blkio_policy_type {
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};
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static inline struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
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static inline struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio) { return NULL; }
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static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, void *key) { return NULL; }
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static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
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static inline void blkcg_drain_queue(struct request_queue *q) { }
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static inline void blkcg_exit_queue(struct request_queue *q) { }
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@ -355,24 +370,5 @@ static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
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static inline void blkg_get(struct blkio_group *blkg) { }
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static inline void blkg_put(struct blkio_group *blkg) { }
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#endif
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#ifdef CONFIG_BLK_CGROUP
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extern struct blkio_cgroup blkio_root_cgroup;
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extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
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extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
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extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
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struct request_queue *q);
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struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
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struct request_queue *q);
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#else
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struct cgroup;
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static inline struct blkio_cgroup *
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cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
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static inline struct blkio_cgroup *
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bio_blkio_cgroup(struct bio *bio) { return NULL; }
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static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
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void *key) { return NULL; }
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#endif
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#endif /* _BLK_CGROUP_H */
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#endif /* CONFIG_BLK_CGROUP */
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#endif /* _BLK_CGROUP_H */
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