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>

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 */