[linux-2.6-block.git] / block / blk-cgroup.h

#ifndef _BLK_CGROUP_H
#define _BLK_CGROUP_H
/*
 * Common Block IO controller cgroup interface
 *
 * Based on ideas and code from CFQ, CFS and BFQ:
 * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
 *
 * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
 *		      Paolo Valente <paolo.valente@unimore.it>
 *
 * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
 * 	              Nauman Rafique <nauman@google.com>
 */

#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;
	spinlock_t lock;
	struct hlist_head blkg_list;
};

struct blkio_group {
	/* An rcu protected unique identifier for the 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_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, 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, dev_t dev)
{
}

static inline int
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 */
Commit	Line	Data
31e4c28d VG	1	#ifndef _BLK_CGROUP_H
	2	#define _BLK_CGROUP_H
	3	/*
	4	* Common Block IO controller cgroup interface
	5	*
	6	* Based on ideas and code from CFQ, CFS and BFQ:
	7	* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
	8	*
	9	* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
	10	* Paolo Valente <paolo.valente@unimore.it>
	11	*
	12	* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
	13	* Nauman Rafique <nauman@google.com>
	14	*/
	15
	16	#include <linux/cgroup.h>
	17
67523c48 BB	18	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
	19
	20	#ifndef CONFIG_BLK_CGROUP
	21	/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
	22	extern struct cgroup_subsys blkio_subsys;
	23	#define blkio_subsys_id blkio_subsys.subsys_id
	24	#endif
2f5ea477	25
31e4c28d VG	26	struct blkio_cgroup {
	27	struct cgroup_subsys_state css;
	28	unsigned int weight;
	29	spinlock_t lock;
	30	struct hlist_head blkg_list;
	31	};
	32
	33	struct blkio_group {
	34	/* An rcu protected unique identifier for the group */
	35	void *key;
	36	struct hlist_node blkcg_node;
b1c35769	37	unsigned short blkcg_id;
2868ef7b VG	38	#ifdef CONFIG_DEBUG_BLK_CGROUP
	39	/* Store cgroup path */
	40	char path[128];
22084190 VG	41	/* How many times this group has been removed from service tree */
22084190 VG	42	unsigned long dequeue;
2868ef7b	43	#endif
22084190 VG	44	/* The device MKDEV(major, minor), this group has been created for */
	45	dev_t dev;
	46
	47	/* total disk time and nr sectors dispatched by this group */
	48	unsigned long time;
	49	unsigned long sectors;
31e4c28d VG	50	};
31e4c28d VG	51
3e252066 VG	52	typedef void (blkio_unlink_group_fn) (void key, struct blkio_group blkg);
	53	typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
	54	unsigned int weight);
	55
	56	struct blkio_policy_ops {
	57	blkio_unlink_group_fn *blkio_unlink_group_fn;
	58	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
	59	};
	60
	61	struct blkio_policy_type {
	62	struct list_head list;
	63	struct blkio_policy_ops ops;
	64	};
	65
	66	/* Blkio controller policy registration */
	67	extern void blkio_policy_register(struct blkio_policy_type *);
	68	extern void blkio_policy_unregister(struct blkio_policy_type *);
	69
2f5ea477 JA	70	#else
	71
	72	struct blkio_group {
	73	};
	74
3e252066 VG	75	struct blkio_policy_type {
	76	};
	77
	78	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	79	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
	80
2f5ea477 JA	81	#endif
2f5ea477 JA	82
31e4c28d VG	83	#define BLKIO_WEIGHT_MIN 100
	84	#define BLKIO_WEIGHT_MAX 1000
	85	#define BLKIO_WEIGHT_DEFAULT 500
	86
2868ef7b VG	87	#ifdef CONFIG_DEBUG_BLK_CGROUP
	88	static inline char blkg_path(struct blkio_group blkg)
	89	{
	90	return blkg->path;
	91	}
22084190 VG	92	void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
22084190 VG	93	unsigned long dequeue);
2868ef7b VG	94	#else
2868ef7b VG	95	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
22084190 VG	96	static inline void blkiocg_update_blkio_group_dequeue_stats(
22084190 VG	97	struct blkio_group *blkg, unsigned long dequeue) {}
2868ef7b VG	98	#endif
2868ef7b VG	99
67523c48	100	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
31e4c28d VG	101	extern struct blkio_cgroup blkio_root_cgroup;
	102	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
	103	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	104	struct blkio_group blkg, void key, dev_t dev);
31e4c28d VG	105	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	106	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	107	void *key);
22084190 VG	108	void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
22084190 VG	109	unsigned long time, unsigned long sectors);
31e4c28d	110	#else
2f5ea477	111	struct cgroup;
31e4c28d VG	112	static inline struct blkio_cgroup *
	113	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
	114
	115	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	116	struct blkio_group blkg, void key, dev_t dev)
31e4c28d VG	117	{
	118	}
	119
	120	static inline int
	121	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	122
	123	static inline struct blkio_group *
	124	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
22084190 VG	125	static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
	126	unsigned long time, unsigned long sectors)
	127	{
	128	}
31e4c28d VG	129	#endif
31e4c28d VG	130	#endif /* _BLK_CGROUP_H */