[GitHub/MotorolaMobilityLLC/kernel-slsi.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>

#ifdef CONFIG_BLK_CGROUP

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;
};

#else

struct blkio_group {
};

#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

#ifdef CONFIG_BLK_CGROUP
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
2f5ea477 JA	18	#ifdef CONFIG_BLK_CGROUP
2f5ea477 JA	19
31e4c28d VG	20	struct blkio_cgroup {
	21	struct cgroup_subsys_state css;
	22	unsigned int weight;
	23	spinlock_t lock;
	24	struct hlist_head blkg_list;
	25	};
	26
	27	struct blkio_group {
	28	/* An rcu protected unique identifier for the group */
	29	void *key;
	30	struct hlist_node blkcg_node;
b1c35769	31	unsigned short blkcg_id;
2868ef7b VG	32	#ifdef CONFIG_DEBUG_BLK_CGROUP
	33	/* Store cgroup path */
	34	char path[128];
22084190 VG	35	/* How many times this group has been removed from service tree */
22084190 VG	36	unsigned long dequeue;
2868ef7b	37	#endif
22084190 VG	38	/* The device MKDEV(major, minor), this group has been created for */
	39	dev_t dev;
	40
	41	/* total disk time and nr sectors dispatched by this group */
	42	unsigned long time;
	43	unsigned long sectors;
31e4c28d VG	44	};
31e4c28d VG	45
2f5ea477 JA	46	#else
	47
	48	struct blkio_group {
	49	};
	50
	51	#endif
	52
31e4c28d VG	53	#define BLKIO_WEIGHT_MIN 100
	54	#define BLKIO_WEIGHT_MAX 1000
	55	#define BLKIO_WEIGHT_DEFAULT 500
	56
2868ef7b VG	57	#ifdef CONFIG_DEBUG_BLK_CGROUP
	58	static inline char blkg_path(struct blkio_group blkg)
	59	{
	60	return blkg->path;
	61	}
22084190 VG	62	void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
22084190 VG	63	unsigned long dequeue);
2868ef7b VG	64	#else
2868ef7b VG	65	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
22084190 VG	66	static inline void blkiocg_update_blkio_group_dequeue_stats(
22084190 VG	67	struct blkio_group *blkg, unsigned long dequeue) {}
2868ef7b VG	68	#endif
2868ef7b VG	69
31e4c28d VG	70	#ifdef CONFIG_BLK_CGROUP
	71	extern struct blkio_cgroup blkio_root_cgroup;
	72	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
	73	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	74	struct blkio_group blkg, void key, dev_t dev);
31e4c28d VG	75	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	76	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	77	void *key);
22084190 VG	78	void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
22084190 VG	79	unsigned long time, unsigned long sectors);
31e4c28d	80	#else
2f5ea477	81	struct cgroup;
31e4c28d VG	82	static inline struct blkio_cgroup *
	83	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
	84
	85	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	86	struct blkio_group blkg, void key, dev_t dev)
31e4c28d VG	87	{
	88	}
	89
	90	static inline int
	91	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	92
	93	static inline struct blkio_group *
	94	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
22084190 VG	95	static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
	96	unsigned long time, unsigned long sectors)
	97	{
	98	}
31e4c28d VG	99	#endif
31e4c28d VG	100	#endif /* _BLK_CGROUP_H */