[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_read_iops_device,
	BLKIO_THROTL_write_iops_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;
		unsigned int iops;
	} 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);
extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
				     dev_t dev);
extern unsigned int blkcg_get_write_iops(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);
typedef void (blkio_update_group_read_iops_fn) (struct blkio_group *blkg,
						unsigned int read_iops);
typedef void (blkio_update_group_write_iops_fn) (struct blkio_group *blkg,
						unsigned int write_iops);

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;
	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_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,
7702e8f4 VG	96	BLKIO_THROTL_read_iops_device,
7702e8f4 VG	97	BLKIO_THROTL_write_iops_device,
4c9eefa1 VG	98	BLKIO_THROTL_io_service_bytes,
	99	BLKIO_THROTL_io_serviced,
	100	};
	101
31e4c28d VG	102	struct blkio_cgroup {
	103	struct cgroup_subsys_state css;
	104	unsigned int weight;
	105	spinlock_t lock;
	106	struct hlist_head blkg_list;
34d0f179	107	struct list_head policy_list; /* list of blkio_policy_node */
31e4c28d VG	108	};
31e4c28d VG	109
303a3acb DS	110	struct blkio_group_stats {
	111	/* total disk time and nr sectors dispatched by this group */
	112	uint64_t time;
	113	uint64_t sectors;
cdc1184c	114	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	115	#ifdef CONFIG_DEBUG_BLK_CGROUP
cdc1184c DS	116	/* Sum of number of IOs queued across all samples */
	117	uint64_t avg_queue_size_sum;
	118	/* Count of samples taken for average */
	119	uint64_t avg_queue_size_samples;
303a3acb DS	120	/* How many times this group has been removed from service tree */
303a3acb DS	121	unsigned long dequeue;
812df48d DS	122
	123	/* Total time spent waiting for it to be assigned a timeslice. */
	124	uint64_t group_wait_time;
	125	uint64_t start_group_wait_time;
	126
	127	/* Time spent idling for this blkio_group */
	128	uint64_t idle_time;
	129	uint64_t start_idle_time;
	130	/*
	131	* Total time when we have requests queued and do not contain the
	132	* current active queue.
	133	*/
	134	uint64_t empty_time;
	135	uint64_t start_empty_time;
	136	uint16_t flags;
303a3acb DS	137	#endif
	138	};
	139
31e4c28d VG	140	struct blkio_group {
	141	/* An rcu protected unique identifier for the group */
	142	void *key;
	143	struct hlist_node blkcg_node;
b1c35769	144	unsigned short blkcg_id;
2868ef7b VG	145	/* Store cgroup path */
2868ef7b VG	146	char path[128];
22084190	147	/* The device MKDEV(major, minor), this group has been created for */
84c124da	148	dev_t dev;
062a644d VG	149	/* policy which owns this blk group */
062a644d VG	150	enum blkio_policy_id plid;
22084190	151
303a3acb DS	152	/* Need to serialize the stats in the case of reset/update */
	153	spinlock_t stats_lock;
	154	struct blkio_group_stats stats;
31e4c28d VG	155	};
31e4c28d VG	156
34d0f179 GJ	157	struct blkio_policy_node {
	158	struct list_head node;
	159	dev_t dev;
062a644d VG	160	/* This node belongs to max bw policy or porportional weight policy */
	161	enum blkio_policy_id plid;
	162	/* cgroup file to which this rule belongs to */
	163	int fileid;
4c9eefa1 VG	164
	165	union {
	166	unsigned int weight;
	167	/*
	168	* Rate read/write in terms of byptes per second
	169	* Whether this rate represents read or write is determined
	170	* by file type "fileid".
	171	*/
	172	u64 bps;
7702e8f4	173	unsigned int iops;
4c9eefa1	174	} val;
34d0f179 GJ	175	};
	176
	177	extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
	178	dev_t dev);
4c9eefa1 VG	179	extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
	180	dev_t dev);
	181	extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
	182	dev_t dev);
7702e8f4 VG	183	extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
	184	dev_t dev);
	185	extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
	186	dev_t dev);
34d0f179	187
3e252066 VG	188	typedef void (blkio_unlink_group_fn) (void key, struct blkio_group blkg);
	189	typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
	190	unsigned int weight);
4c9eefa1 VG	191	typedef void (blkio_update_group_read_bps_fn) (struct blkio_group *blkg,
	192	u64 read_bps);
	193	typedef void (blkio_update_group_write_bps_fn) (struct blkio_group *blkg,
	194	u64 write_bps);
7702e8f4 VG	195	typedef void (blkio_update_group_read_iops_fn) (struct blkio_group *blkg,
	196	unsigned int read_iops);
	197	typedef void (blkio_update_group_write_iops_fn) (struct blkio_group *blkg,
	198	unsigned int write_iops);
3e252066 VG	199
	200	struct blkio_policy_ops {
	201	blkio_unlink_group_fn *blkio_unlink_group_fn;
	202	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	203	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	204	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
7702e8f4 VG	205	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
7702e8f4 VG	206	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
3e252066 VG	207	};
	208
	209	struct blkio_policy_type {
	210	struct list_head list;
	211	struct blkio_policy_ops ops;
062a644d	212	enum blkio_policy_id plid;
3e252066 VG	213	};
	214
	215	/* Blkio controller policy registration */
	216	extern void blkio_policy_register(struct blkio_policy_type *);
	217	extern void blkio_policy_unregister(struct blkio_policy_type *);
	218
afc24d49 VG	219	static inline char blkg_path(struct blkio_group blkg)
	220	{
	221	return blkg->path;
	222	}
	223
2f5ea477 JA	224	#else
	225
	226	struct blkio_group {
	227	};
	228
3e252066 VG	229	struct blkio_policy_type {
	230	};
	231
	232	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	233	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
	234
afc24d49 VG	235	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	236
2f5ea477 JA	237	#endif
2f5ea477 JA	238
31e4c28d VG	239	#define BLKIO_WEIGHT_MIN 100
	240	#define BLKIO_WEIGHT_MAX 1000
	241	#define BLKIO_WEIGHT_DEFAULT 500
	242
2868ef7b	243	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	244	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	245	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	246	unsigned long dequeue);
812df48d DS	247	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	248	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	249	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	250
	251	#define BLKG_FLAG_FNS(name) \
	252	static inline void blkio_mark_blkg_##name( \
	253	struct blkio_group_stats *stats) \
	254	{ \
	255	stats->flags \|= (1 << BLKG_##name); \
	256	} \
	257	static inline void blkio_clear_blkg_##name( \
	258	struct blkio_group_stats *stats) \
	259	{ \
	260	stats->flags &= ~(1 << BLKG_##name); \
	261	} \
	262	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	263	{ \
	264	return (stats->flags & (1 << BLKG_##name)) != 0; \
	265	} \
	266
	267	BLKG_FLAG_FNS(waiting)
	268	BLKG_FLAG_FNS(idling)
	269	BLKG_FLAG_FNS(empty)
	270	#undef BLKG_FLAG_FNS
2868ef7b	271	#else
a11cdaa7	272	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	273	struct blkio_group *blkg) {}
9195291e DS	274	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	275	unsigned long dequeue) {}
812df48d DS	276	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	277	{}
	278	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	279	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	280	#endif
2868ef7b VG	281
67523c48	282	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
31e4c28d VG	283	extern struct blkio_cgroup blkio_root_cgroup;
	284	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
	285	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	286	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	287	enum blkio_policy_id plid);
31e4c28d VG	288	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	289	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	290	void *key);
303a3acb DS	291	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
303a3acb DS	292	unsigned long time);
84c124da DS	293	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	294	bool direction, bool sync);
	295	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	296	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	297	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	298	bool sync);
a11cdaa7	299	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	300	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	301	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	302	bool direction, bool sync);
31e4c28d	303	#else
2f5ea477	304	struct cgroup;
31e4c28d VG	305	static inline struct blkio_cgroup *
	306	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
	307
	308	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
062a644d VG	309	struct blkio_group blkg, void key, dev_t dev,
062a644d VG	310	enum blkio_policy_id plid) {}
31e4c28d VG	311
	312	static inline int
	313	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	314
	315	static inline struct blkio_group *
	316	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
303a3acb	317	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
9a0785b0	318	unsigned long time) {}
84c124da DS	319	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	320	uint64_t bytes, bool direction, bool sync) {}
	321	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	322	uint64_t start_time, uint64_t io_start_time, bool direction,
	323	bool sync) {}
812d4026 DS	324	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	325	bool direction, bool sync) {}
a11cdaa7	326	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	327	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	328	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	329	bool direction, bool sync) {}
31e4c28d VG	330	#endif
31e4c28d VG	331	#endif /* _BLK_CGROUP_H */