Merge branch 'for-linus/i2c-2635' of git://git.fluff.org/bjdooks/linux

[safe/jmp/linux-2.6] / block / blk-cgroup.h

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index cd50a2f..8ccc204 100644 (file)
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -15,6 +15,14 @@
 
 #include <linux/cgroup.h>
 
+#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
+
+#ifndef CONFIG_BLK_CGROUP
+/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
+extern struct cgroup_subsys blkio_subsys;
+#define blkio_subsys_id blkio_subsys.subsys_id
+#endif
+
 struct blkio_cgroup {
        struct cgroup_subsys_state css;
        unsigned int weight;
@@ -27,26 +35,85 @@ struct blkio_group {
        void *key;
        struct hlist_node blkcg_node;
        unsigned short blkcg_id;
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+       /* Store cgroup path */
+       char path[128];
+       /* How many times this group has been removed from service tree */
+       unsigned long dequeue;
+#endif
+       /* The device MKDEV(major, minor), this group has been created for */
+       dev_t   dev;
+
+       /* total disk time and nr sectors dispatched by this group */
+       unsigned long time;
+       unsigned long sectors;
+};
+
+typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
+typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
+                                               unsigned int weight);
+
+struct blkio_policy_ops {
+       blkio_unlink_group_fn *blkio_unlink_group_fn;
+       blkio_update_group_weight_fn *blkio_update_group_weight_fn;
+};
+
+struct blkio_policy_type {
+       struct list_head list;
+       struct blkio_policy_ops ops;
+};
+
+/* Blkio controller policy registration */
+extern void blkio_policy_register(struct blkio_policy_type *);
+extern void blkio_policy_unregister(struct blkio_policy_type *);
+
+#else
+
+struct blkio_group {
+};
+
+struct blkio_policy_type {
 };
 
+static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
+static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
+
+#endif
+
 #define BLKIO_WEIGHT_MIN       100
 #define BLKIO_WEIGHT_MAX       1000
 #define BLKIO_WEIGHT_DEFAULT   500
 
-#ifdef CONFIG_BLK_CGROUP
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+static inline char *blkg_path(struct blkio_group *blkg)
+{
+       return blkg->path;
+}
+void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
+                               unsigned long dequeue);
+#else
+static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
+static inline void blkiocg_update_blkio_group_dequeue_stats(
+                       struct blkio_group *blkg, unsigned long dequeue) {}
+#endif
+
+#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
 extern struct blkio_cgroup blkio_root_cgroup;
 extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
 extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
-                               struct blkio_group *blkg, void *key);
+                       struct blkio_group *blkg, void *key, dev_t dev);
 extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
 extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
                                                void *key);
+void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
+                       unsigned long time, unsigned long sectors);
 #else
+struct cgroup;
 static inline struct blkio_cgroup *
 cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
 
 static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
-                       struct blkio_group *blkg, void *key)
+                       struct blkio_group *blkg, void *key, dev_t dev)
 {
 }
 
@@ -55,5 +122,9 @@ blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
 
 static inline struct blkio_group *
 blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
+static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
+                       unsigned long time, unsigned long sectors)
+{
+}
 #endif
 #endif /* _BLK_CGROUP_H */