[net-next-2.6.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>

enum blkio_policy_id {
	BLKIO_POLICY_PROP = 0,		/* Proportional Bandwidth division */
	BLKIO_POLICY_THROTL,		/* Throttling */
};

#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

enum stat_type {
	/* Total time spent (in ns) between request dispatch to the driver and
	 * request completion for IOs doen by this cgroup. This may not be
	 * accurate when NCQ is turned on. */
	BLKIO_STAT_SERVICE_TIME = 0,
	/* Total bytes transferred */
	BLKIO_STAT_SERVICE_BYTES,
	/* Total IOs serviced, post merge */
	BLKIO_STAT_SERVICED,
	/* Total time spent waiting in scheduler queue in ns */
	BLKIO_STAT_WAIT_TIME,
	/* Number of IOs merged */
	BLKIO_STAT_MERGED,
	/* Number of IOs queued up */
	BLKIO_STAT_QUEUED,
	/* All the single valued stats go below this */
	BLKIO_STAT_TIME,
	BLKIO_STAT_SECTORS,
#ifdef CONFIG_DEBUG_BLK_CGROUP
	BLKIO_STAT_AVG_QUEUE_SIZE,
	BLKIO_STAT_IDLE_TIME,
	BLKIO_STAT_EMPTY_TIME,
	BLKIO_STAT_GROUP_WAIT_TIME,
	BLKIO_STAT_DEQUEUE
#endif
};

enum stat_sub_type {
	BLKIO_STAT_READ = 0,
	BLKIO_STAT_WRITE,
	BLKIO_STAT_SYNC,
	BLKIO_STAT_ASYNC,
	BLKIO_STAT_TOTAL
};

/* blkg state flags */
enum blkg_state_flags {
	BLKG_waiting = 0,
	BLKG_idling,
	BLKG_empty,
};

/* cgroup files owned by proportional weight policy */
enum blkcg_file_name_prop {
	BLKIO_PROP_weight = 1,
	BLKIO_PROP_weight_device,
	BLKIO_PROP_io_service_bytes,
	BLKIO_PROP_io_serviced,
	BLKIO_PROP_time,
	BLKIO_PROP_sectors,
	BLKIO_PROP_io_service_time,
	BLKIO_PROP_io_wait_time,
	BLKIO_PROP_io_merged,
	BLKIO_PROP_io_queued,
	BLKIO_PROP_avg_queue_size,
	BLKIO_PROP_group_wait_time,
	BLKIO_PROP_idle_time,
	BLKIO_PROP_empty_time,
	BLKIO_PROP_dequeue,
};

/* cgroup files owned by throttle policy */
enum blkcg_file_name_throtl {
	BLKIO_THROTL_read_bps_device,
	BLKIO_THROTL_write_bps_device,
	BLKIO_THROTL_io_service_bytes,
	BLKIO_THROTL_io_serviced,
};

struct blkio_cgroup {
	struct cgroup_subsys_state css;
	unsigned int weight;
	spinlock_t lock;
	struct hlist_head blkg_list;
	struct list_head policy_list; /* list of blkio_policy_node */
};

struct blkio_group_stats {
	/* total disk time and nr sectors dispatched by this group */
	uint64_t time;
	uint64_t sectors;
	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Sum of number of IOs queued across all samples */
	uint64_t avg_queue_size_sum;
	/* Count of samples taken for average */
	uint64_t avg_queue_size_samples;
	/* How many times this group has been removed from service tree */
	unsigned long dequeue;

	/* Total time spent waiting for it to be assigned a timeslice. */
	uint64_t group_wait_time;
	uint64_t start_group_wait_time;

	/* Time spent idling for this blkio_group */
	uint64_t idle_time;
	uint64_t start_idle_time;
	/*
	 * Total time when we have requests queued and do not contain the
	 * current active queue.
	 */
	uint64_t empty_time;
	uint64_t start_empty_time;
	uint16_t flags;
#endif
};

struct blkio_group {
	/* An rcu protected unique identifier for the group */
	void *key;
	struct hlist_node blkcg_node;
	unsigned short blkcg_id;
	/* Store cgroup path */
	char path[128];
	/* The device MKDEV(major, minor), this group has been created for */
	dev_t dev;
	/* policy which owns this blk group */
	enum blkio_policy_id plid;

	/* Need to serialize the stats in the case of reset/update */
	spinlock_t stats_lock;
	struct blkio_group_stats stats;
};

struct blkio_policy_node {
	struct list_head node;
	dev_t dev;
	/* This node belongs to max bw policy or porportional weight policy */
	enum blkio_policy_id plid;
	/* cgroup file to which this rule belongs to */
	int fileid;

	union {
		unsigned int weight;
		/*
		 * Rate read/write in terms of byptes per second
		 * Whether this rate represents read or write is determined
		 * by file type "fileid".
		 */
		u64 bps;
	} val;
};

extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
				     dev_t dev);

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);
typedef void (blkio_update_group_read_bps_fn) (struct blkio_group *blkg,
						u64 read_bps);
typedef void (blkio_update_group_write_bps_fn) (struct blkio_group *blkg,
						u64 write_bps);

struct blkio_policy_ops {
	blkio_unlink_group_fn *blkio_unlink_group_fn;
	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
};

struct blkio_policy_type {
	struct list_head list;
	struct blkio_policy_ops ops;
	enum blkio_policy_id plid;
};

/* Blkio controller policy registration */
extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);

static inline char *blkg_path(struct blkio_group *blkg)
{
	return blkg->path;
}

#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) { }

static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }

#endif

#define BLKIO_WEIGHT_MIN	100
#define BLKIO_WEIGHT_MAX	1000
#define BLKIO_WEIGHT_DEFAULT	500

#ifdef CONFIG_DEBUG_BLK_CGROUP
void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
				unsigned long dequeue);
void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
void blkiocg_set_start_empty_time(struct blkio_group *blkg);

#define BLKG_FLAG_FNS(name)						\
static inline void blkio_mark_blkg_##name(				\
		struct blkio_group_stats *stats)			\
{									\
	stats->flags |= (1 << BLKG_##name);				\
}									\
static inline void blkio_clear_blkg_##name(				\
		struct blkio_group_stats *stats)			\
{									\
	stats->flags &= ~(1 << BLKG_##name);				\
}									\
static inline int blkio_blkg_##name(struct blkio_group_stats *stats)	\
{									\
	return (stats->flags & (1 << BLKG_##name)) != 0;		\
}									\

BLKG_FLAG_FNS(waiting)
BLKG_FLAG_FNS(idling)
BLKG_FLAG_FNS(empty)
#undef BLKG_FLAG_FNS
#else
static inline void blkiocg_update_avg_queue_size_stats(
						struct blkio_group *blkg) {}
static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
						unsigned long dequeue) {}
static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
{}
static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
#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,
	enum blkio_policy_id plid);
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_timeslice_used(struct blkio_group *blkg,
					unsigned long time);
void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
						bool direction, bool sync);
void blkiocg_update_completion_stats(struct blkio_group *blkg,
	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
					bool sync);
void blkiocg_update_io_add_stats(struct blkio_group *blkg,
		struct blkio_group *curr_blkg, bool direction, bool sync);
void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
					bool direction, bool sync);
#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,
		enum blkio_policy_id plid) {}

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_timeslice_used(struct blkio_group *blkg,
						unsigned long time) {}
static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
				uint64_t bytes, bool direction, bool sync) {}
static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
		uint64_t start_time, uint64_t io_start_time, bool direction,
		bool sync) {}
static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
						bool direction, bool sync) {}
static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
		struct blkio_group *curr_blkg, bool direction, bool sync) {}
static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
						bool direction, bool sync) {}
#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
062a644d VG	18	enum blkio_policy_id {
062a644d VG	19	BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
4c9eefa1	20	BLKIO_POLICY_THROTL, /* Throttling */
062a644d VG	21	};
062a644d VG	22
67523c48 BB	23	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
	24
	25	#ifndef CONFIG_BLK_CGROUP
	26	/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
	27	extern struct cgroup_subsys blkio_subsys;
	28	#define blkio_subsys_id blkio_subsys.subsys_id
	29	#endif
2f5ea477	30
84c124da DS	31	enum stat_type {
	32	/* Total time spent (in ns) between request dispatch to the driver and
	33	* request completion for IOs doen by this cgroup. This may not be
	34	* accurate when NCQ is turned on. */
	35	BLKIO_STAT_SERVICE_TIME = 0,
	36	/* Total bytes transferred */
	37	BLKIO_STAT_SERVICE_BYTES,
	38	/* Total IOs serviced, post merge */
	39	BLKIO_STAT_SERVICED,
	40	/* Total time spent waiting in scheduler queue in ns */
	41	BLKIO_STAT_WAIT_TIME,
812d4026 DS	42	/* Number of IOs merged */
812d4026 DS	43	BLKIO_STAT_MERGED,
cdc1184c DS	44	/* Number of IOs queued up */
cdc1184c DS	45	BLKIO_STAT_QUEUED,
84c124da DS	46	/* All the single valued stats go below this */
	47	BLKIO_STAT_TIME,
	48	BLKIO_STAT_SECTORS,
	49	#ifdef CONFIG_DEBUG_BLK_CGROUP
cdc1184c	50	BLKIO_STAT_AVG_QUEUE_SIZE,
812df48d DS	51	BLKIO_STAT_IDLE_TIME,
	52	BLKIO_STAT_EMPTY_TIME,
	53	BLKIO_STAT_GROUP_WAIT_TIME,
84c124da DS	54	BLKIO_STAT_DEQUEUE
	55	#endif
	56	};
	57
	58	enum stat_sub_type {
	59	BLKIO_STAT_READ = 0,
	60	BLKIO_STAT_WRITE,
	61	BLKIO_STAT_SYNC,
	62	BLKIO_STAT_ASYNC,
	63	BLKIO_STAT_TOTAL
303a3acb DS	64	};
303a3acb DS	65
812df48d DS	66	/* blkg state flags */
	67	enum blkg_state_flags {
	68	BLKG_waiting = 0,
	69	BLKG_idling,
	70	BLKG_empty,
	71	};
	72
062a644d VG	73	/* cgroup files owned by proportional weight policy */
	74	enum blkcg_file_name_prop {
	75	BLKIO_PROP_weight = 1,
	76	BLKIO_PROP_weight_device,
	77	BLKIO_PROP_io_service_bytes,
	78	BLKIO_PROP_io_serviced,
	79	BLKIO_PROP_time,
	80	BLKIO_PROP_sectors,
	81	BLKIO_PROP_io_service_time,
	82	BLKIO_PROP_io_wait_time,
	83	BLKIO_PROP_io_merged,
	84	BLKIO_PROP_io_queued,
	85	BLKIO_PROP_avg_queue_size,
	86	BLKIO_PROP_group_wait_time,
	87	BLKIO_PROP_idle_time,
	88	BLKIO_PROP_empty_time,
	89	BLKIO_PROP_dequeue,
	90	};
	91
4c9eefa1 VG	92	/* cgroup files owned by throttle policy */
	93	enum blkcg_file_name_throtl {
	94	BLKIO_THROTL_read_bps_device,
	95	BLKIO_THROTL_write_bps_device,
	96	BLKIO_THROTL_io_service_bytes,
	97	BLKIO_THROTL_io_serviced,
	98	};
	99
31e4c28d VG	100	struct blkio_cgroup {
	101	struct cgroup_subsys_state css;
	102	unsigned int weight;
	103	spinlock_t lock;
	104	struct hlist_head blkg_list;
34d0f179	105	struct list_head policy_list; /* list of blkio_policy_node */
31e4c28d VG	106	};
31e4c28d VG	107
303a3acb DS	108	struct blkio_group_stats {
	109	/* total disk time and nr sectors dispatched by this group */
	110	uint64_t time;
	111	uint64_t sectors;
cdc1184c	112	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	113	#ifdef CONFIG_DEBUG_BLK_CGROUP
cdc1184c DS	114	/* Sum of number of IOs queued across all samples */
	115	uint64_t avg_queue_size_sum;
	116	/* Count of samples taken for average */
	117	uint64_t avg_queue_size_samples;
303a3acb DS	118	/* How many times this group has been removed from service tree */
303a3acb DS	119	unsigned long dequeue;
812df48d DS	120
	121	/* Total time spent waiting for it to be assigned a timeslice. */
	122	uint64_t group_wait_time;
	123	uint64_t start_group_wait_time;
	124
	125	/* Time spent idling for this blkio_group */
	126	uint64_t idle_time;
	127	uint64_t start_idle_time;
	128	/*
	129	* Total time when we have requests queued and do not contain the
	130	* current active queue.
	131	*/
	132	uint64_t empty_time;
	133	uint64_t start_empty_time;
	134	uint16_t flags;
303a3acb DS	135	#endif
	136	};
	137
31e4c28d VG	138	struct blkio_group {
	139	/* An rcu protected unique identifier for the group */
	140	void *key;
	141	struct hlist_node blkcg_node;
b1c35769	142	unsigned short blkcg_id;
2868ef7b VG	143	/* Store cgroup path */
2868ef7b VG	144	char path[128];
22084190	145	/* The device MKDEV(major, minor), this group has been created for */
84c124da	146	dev_t dev;
062a644d VG	147	/* policy which owns this blk group */
062a644d VG	148	enum blkio_policy_id plid;
22084190	149
303a3acb DS	150	/* Need to serialize the stats in the case of reset/update */
	151	spinlock_t stats_lock;
	152	struct blkio_group_stats stats;
31e4c28d VG	153	};
31e4c28d VG	154
34d0f179 GJ	155	struct blkio_policy_node {
	156	struct list_head node;
	157	dev_t dev;
062a644d VG	158	/* This node belongs to max bw policy or porportional weight policy */
	159	enum blkio_policy_id plid;
	160	/* cgroup file to which this rule belongs to */
	161	int fileid;
4c9eefa1 VG	162
	163	union {
	164	unsigned int weight;
	165	/*
	166	* Rate read/write in terms of byptes per second
	167	* Whether this rate represents read or write is determined
	168	* by file type "fileid".
	169	*/
	170	u64 bps;
	171	} val;
34d0f179 GJ	172	};
	173
	174	extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
	175	dev_t dev);
4c9eefa1 VG	176	extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
	177	dev_t dev);
	178	extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
	179	dev_t dev);
34d0f179	180
3e252066 VG	181	typedef void (blkio_unlink_group_fn) (void key, struct blkio_group blkg);
	182	typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
	183	unsigned int weight);
4c9eefa1 VG	184	typedef void (blkio_update_group_read_bps_fn) (struct blkio_group *blkg,
	185	u64 read_bps);
	186	typedef void (blkio_update_group_write_bps_fn) (struct blkio_group *blkg,
	187	u64 write_bps);
3e252066 VG	188
	189	struct blkio_policy_ops {
	190	blkio_unlink_group_fn *blkio_unlink_group_fn;
	191	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	192	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	193	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
3e252066 VG	194	};
	195
	196	struct blkio_policy_type {
	197	struct list_head list;
	198	struct blkio_policy_ops ops;
062a644d	199	enum blkio_policy_id plid;
3e252066 VG	200	};
	201
	202	/* Blkio controller policy registration */
	203	extern void blkio_policy_register(struct blkio_policy_type *);
	204	extern void blkio_policy_unregister(struct blkio_policy_type *);
	205
afc24d49 VG	206	static inline char blkg_path(struct blkio_group blkg)
	207	{
	208	return blkg->path;
	209	}
	210
2f5ea477 JA	211	#else
	212
	213	struct blkio_group {
	214	};
	215
3e252066 VG	216	struct blkio_policy_type {
	217	};
	218
	219	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	220	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
	221
afc24d49 VG	222	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	223
2f5ea477 JA	224	#endif
2f5ea477 JA	225
31e4c28d VG	226	#define BLKIO_WEIGHT_MIN 100
	227	#define BLKIO_WEIGHT_MAX 1000
	228	#define BLKIO_WEIGHT_DEFAULT 500
	229
2868ef7b	230	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	231	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	232	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	233	unsigned long dequeue);
812df48d DS	234	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	235	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	236	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	237
	238	#define BLKG_FLAG_FNS(name) \
	239	static inline void blkio_mark_blkg_##name( \
	240	struct blkio_group_stats *stats) \
	241	{ \
	242	stats->flags \|= (1 << BLKG_##name); \
	243	} \
	244	static inline void blkio_clear_blkg_##name( \
	245	struct blkio_group_stats *stats) \
	246	{ \
	247	stats->flags &= ~(1 << BLKG_##name); \
	248	} \
	249	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	250	{ \
	251	return (stats->flags & (1 << BLKG_##name)) != 0; \
	252	} \
	253
	254	BLKG_FLAG_FNS(waiting)
	255	BLKG_FLAG_FNS(idling)
	256	BLKG_FLAG_FNS(empty)
	257	#undef BLKG_FLAG_FNS
2868ef7b	258	#else
a11cdaa7	259	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	260	struct blkio_group *blkg) {}
9195291e DS	261	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	262	unsigned long dequeue) {}
812df48d DS	263	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	264	{}
	265	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	266	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	267	#endif
2868ef7b VG	268
67523c48	269	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
31e4c28d VG	270	extern struct blkio_cgroup blkio_root_cgroup;
	271	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
	272	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	273	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	274	enum blkio_policy_id plid);
31e4c28d VG	275	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	276	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	277	void *key);
303a3acb DS	278	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
303a3acb DS	279	unsigned long time);
84c124da DS	280	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	281	bool direction, bool sync);
	282	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	283	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	284	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	285	bool sync);
a11cdaa7	286	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	287	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	288	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	289	bool direction, bool sync);
31e4c28d	290	#else
2f5ea477	291	struct cgroup;
31e4c28d VG	292	static inline struct blkio_cgroup *
	293	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
	294
	295	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	296	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	297	enum blkio_policy_id plid) {}
31e4c28d VG	298
	299	static inline int
	300	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	301
	302	static inline struct blkio_group *
	303	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
303a3acb	304	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
9a0785b0	305	unsigned long time) {}
84c124da DS	306	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	307	uint64_t bytes, bool direction, bool sync) {}
	308	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	309	uint64_t start_time, uint64_t io_start_time, bool direction,
	310	bool sync) {}
812d4026 DS	311	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	312	bool direction, bool sync) {}
a11cdaa7	313	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	314	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	315	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	316	bool direction, bool sync) {}
31e4c28d VG	317	#endif
31e4c28d VG	318	#endif /* _BLK_CGROUP_H */