[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>
#include <linux/u64_stats_sync.h>

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

	BLKIO_NR_POLICIES,
};

/* Max limits for throttle policy */
#define THROTL_IOPS_MAX		UINT_MAX

#ifdef CONFIG_BLK_CGROUP

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 time spent waiting in scheduler queue in ns */
	BLKIO_STAT_WAIT_TIME,
	/* Number of IOs queued up */
	BLKIO_STAT_QUEUED,
	/* All the single valued stats go below this */
	BLKIO_STAT_TIME,
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Time not charged to this cgroup */
	BLKIO_STAT_UNACCOUNTED_TIME,
	BLKIO_STAT_AVG_QUEUE_SIZE,
	BLKIO_STAT_IDLE_TIME,
	BLKIO_STAT_EMPTY_TIME,
	BLKIO_STAT_GROUP_WAIT_TIME,
	BLKIO_STAT_DEQUEUE
#endif
};

/* Per cpu stats */
enum stat_type_cpu {
	BLKIO_STAT_CPU_SECTORS,
	/* Total bytes transferred */
	BLKIO_STAT_CPU_SERVICE_BYTES,
	/* Total IOs serviced, post merge */
	BLKIO_STAT_CPU_SERVICED,
	/* Number of IOs merged */
	BLKIO_STAT_CPU_MERGED,
	BLKIO_STAT_CPU_NR
};

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_unaccounted_time,
	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 blkio_group_stats {
	/* total disk time and nr sectors dispatched by this group */
	uint64_t time;
	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Time not charged to this cgroup */
	uint64_t unaccounted_time;

	/* 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
};

/* Per cpu blkio group stats */
struct blkio_group_stats_cpu {
	uint64_t sectors;
	uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
	struct u64_stats_sync syncp;
};

struct blkio_group_conf {
	unsigned int weight;
	unsigned int iops[2];
	u64 bps[2];
};

struct blkio_group {
	/* Pointer to the associated request_queue, RCU protected */
	struct request_queue __rcu *q;
	struct hlist_node blkcg_node;
	struct blkio_cgroup *blkcg;
	/* Store cgroup path */
	char path[128];
	/* policy which owns this blk group */
	enum blkio_policy_id plid;

	/* Configuration */
	struct blkio_group_conf conf;

	/* Need to serialize the stats in the case of reset/update */
	spinlock_t stats_lock;
	struct blkio_group_stats stats;
	/* Per cpu stats pointer */
	struct blkio_group_stats_cpu __percpu *stats_cpu;
};

typedef struct blkio_group *(blkio_alloc_group_fn)(struct request_queue *q,
						   struct blkio_cgroup *blkcg);
typedef void (blkio_link_group_fn)(struct request_queue *q,
			struct blkio_group *blkg);
typedef void (blkio_unlink_group_fn)(struct request_queue *q,
			struct blkio_group *blkg);
typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int weight);
typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
			struct blkio_group *blkg, u64 read_bps);
typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
			struct blkio_group *blkg, u64 write_bps);
typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int read_iops);
typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
			struct blkio_group *blkg, unsigned int write_iops);

struct blkio_policy_ops {
	blkio_alloc_group_fn *blkio_alloc_group_fn;
	blkio_link_group_fn *blkio_link_group_fn;
	blkio_unlink_group_fn *blkio_unlink_group_fn;
	blkio_clear_queue_fn *blkio_clear_queue_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 *);
extern void blkg_destroy_all(struct request_queue *q);

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 void blkg_destroy_all(struct request_queue *q) { }

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

#endif

#define BLKIO_WEIGHT_MIN	10
#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

#ifdef CONFIG_BLK_CGROUP
extern struct blkio_cgroup blkio_root_cgroup;
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
				       struct request_queue *q,
				       enum blkio_policy_id plid);
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
				       struct request_queue *q,
				       enum blkio_policy_id plid,
				       bool for_root);
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
					unsigned long time,
					unsigned long unaccounted_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 struct blkio_cgroup *
task_blkio_cgroup(struct task_struct *tsk) { return NULL; }

static inline int
blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }

static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
					      void *key) { return NULL; }
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
						unsigned long time,
						unsigned long unaccounted_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>
575969a0	17	#include <linux/u64_stats_sync.h>
31e4c28d	18
062a644d VG	19	enum blkio_policy_id {
062a644d VG	20	BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
4c9eefa1	21	BLKIO_POLICY_THROTL, /* Throttling */
035d10b2 TH	22
035d10b2 TH	23	BLKIO_NR_POLICIES,
062a644d VG	24	};
062a644d VG	25
9355aede VG	26	/* Max limits for throttle policy */
	27	#define THROTL_IOPS_MAX UINT_MAX
	28
32e380ae	29	#ifdef CONFIG_BLK_CGROUP
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,
84c124da DS	36	/* Total time spent waiting in scheduler queue in ns */
84c124da DS	37	BLKIO_STAT_WAIT_TIME,
cdc1184c DS	38	/* Number of IOs queued up */
cdc1184c DS	39	BLKIO_STAT_QUEUED,
84c124da DS	40	/* All the single valued stats go below this */
84c124da DS	41	BLKIO_STAT_TIME,
a23e6869	42	#ifdef CONFIG_DEBUG_BLK_CGROUP
167400d3 JT	43	/* Time not charged to this cgroup */
167400d3 JT	44	BLKIO_STAT_UNACCOUNTED_TIME,
cdc1184c	45	BLKIO_STAT_AVG_QUEUE_SIZE,
812df48d DS	46	BLKIO_STAT_IDLE_TIME,
	47	BLKIO_STAT_EMPTY_TIME,
	48	BLKIO_STAT_GROUP_WAIT_TIME,
84c124da DS	49	BLKIO_STAT_DEQUEUE
	50	#endif
	51	};
	52
5624a4e4 VG	53	/* Per cpu stats */
	54	enum stat_type_cpu {
	55	BLKIO_STAT_CPU_SECTORS,
	56	/* Total bytes transferred */
	57	BLKIO_STAT_CPU_SERVICE_BYTES,
	58	/* Total IOs serviced, post merge */
	59	BLKIO_STAT_CPU_SERVICED,
317389a7 VG	60	/* Number of IOs merged */
317389a7 VG	61	BLKIO_STAT_CPU_MERGED,
5624a4e4 VG	62	BLKIO_STAT_CPU_NR
	63	};
	64
84c124da DS	65	enum stat_sub_type {
	66	BLKIO_STAT_READ = 0,
	67	BLKIO_STAT_WRITE,
	68	BLKIO_STAT_SYNC,
	69	BLKIO_STAT_ASYNC,
	70	BLKIO_STAT_TOTAL
303a3acb DS	71	};
303a3acb DS	72
812df48d DS	73	/* blkg state flags */
	74	enum blkg_state_flags {
	75	BLKG_waiting = 0,
	76	BLKG_idling,
	77	BLKG_empty,
	78	};
	79
062a644d VG	80	/* cgroup files owned by proportional weight policy */
	81	enum blkcg_file_name_prop {
	82	BLKIO_PROP_weight = 1,
	83	BLKIO_PROP_weight_device,
	84	BLKIO_PROP_io_service_bytes,
	85	BLKIO_PROP_io_serviced,
	86	BLKIO_PROP_time,
	87	BLKIO_PROP_sectors,
167400d3	88	BLKIO_PROP_unaccounted_time,
062a644d VG	89	BLKIO_PROP_io_service_time,
	90	BLKIO_PROP_io_wait_time,
	91	BLKIO_PROP_io_merged,
	92	BLKIO_PROP_io_queued,
	93	BLKIO_PROP_avg_queue_size,
	94	BLKIO_PROP_group_wait_time,
	95	BLKIO_PROP_idle_time,
	96	BLKIO_PROP_empty_time,
	97	BLKIO_PROP_dequeue,
	98	};
	99
4c9eefa1 VG	100	/* cgroup files owned by throttle policy */
	101	enum blkcg_file_name_throtl {
	102	BLKIO_THROTL_read_bps_device,
	103	BLKIO_THROTL_write_bps_device,
7702e8f4 VG	104	BLKIO_THROTL_read_iops_device,
7702e8f4 VG	105	BLKIO_THROTL_write_iops_device,
4c9eefa1 VG	106	BLKIO_THROTL_io_service_bytes,
	107	BLKIO_THROTL_io_serviced,
	108	};
	109
31e4c28d VG	110	struct blkio_cgroup {
	111	struct cgroup_subsys_state css;
	112	unsigned int weight;
	113	spinlock_t lock;
	114	struct hlist_head blkg_list;
	115	};
	116
303a3acb DS	117	struct blkio_group_stats {
	118	/* total disk time and nr sectors dispatched by this group */
	119	uint64_t time;
cdc1184c	120	uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
303a3acb	121	#ifdef CONFIG_DEBUG_BLK_CGROUP
a23e6869 VG	122	/* Time not charged to this cgroup */
	123	uint64_t unaccounted_time;
	124
cdc1184c DS	125	/* Sum of number of IOs queued across all samples */
	126	uint64_t avg_queue_size_sum;
	127	/* Count of samples taken for average */
	128	uint64_t avg_queue_size_samples;
303a3acb DS	129	/* How many times this group has been removed from service tree */
303a3acb DS	130	unsigned long dequeue;
812df48d DS	131
	132	/* Total time spent waiting for it to be assigned a timeslice. */
	133	uint64_t group_wait_time;
	134	uint64_t start_group_wait_time;
	135
	136	/* Time spent idling for this blkio_group */
	137	uint64_t idle_time;
	138	uint64_t start_idle_time;
	139	/*
	140	* Total time when we have requests queued and do not contain the
	141	* current active queue.
	142	*/
	143	uint64_t empty_time;
	144	uint64_t start_empty_time;
	145	uint16_t flags;
303a3acb DS	146	#endif
	147	};
	148
5624a4e4 VG	149	/* Per cpu blkio group stats */
	150	struct blkio_group_stats_cpu {
	151	uint64_t sectors;
	152	uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
575969a0	153	struct u64_stats_sync syncp;
5624a4e4 VG	154	};
5624a4e4 VG	155
e56da7e2 TH	156	struct blkio_group_conf {
	157	unsigned int weight;
	158	unsigned int iops[2];
	159	u64 bps[2];
	160	};
	161
31e4c28d	162	struct blkio_group {
ca32aefc TH	163	/* Pointer to the associated request_queue, RCU protected */
ca32aefc TH	164	struct request_queue __rcu *q;
31e4c28d	165	struct hlist_node blkcg_node;
7ee9c562	166	struct blkio_cgroup *blkcg;
2868ef7b VG	167	/* Store cgroup path */
2868ef7b VG	168	char path[128];
062a644d VG	169	/* policy which owns this blk group */
062a644d VG	170	enum blkio_policy_id plid;
22084190	171
e56da7e2 TH	172	/* Configuration */
	173	struct blkio_group_conf conf;
	174
303a3acb DS	175	/* Need to serialize the stats in the case of reset/update */
	176	spinlock_t stats_lock;
	177	struct blkio_group_stats stats;
5624a4e4 VG	178	/* Per cpu stats pointer */
5624a4e4 VG	179	struct blkio_group_stats_cpu __percpu *stats_cpu;
31e4c28d VG	180	};
31e4c28d VG	181
cd1604fa TH	182	typedef struct blkio_group (blkio_alloc_group_fn)(struct request_queue q,
	183	struct blkio_cgroup *blkcg);
	184	typedef void (blkio_link_group_fn)(struct request_queue *q,
	185	struct blkio_group *blkg);
ca32aefc TH	186	typedef void (blkio_unlink_group_fn)(struct request_queue *q,
ca32aefc TH	187	struct blkio_group *blkg);
72e06c25	188	typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
ca32aefc	189	typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
fe071437	190	struct blkio_group *blkg, unsigned int weight);
ca32aefc	191	typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
fe071437	192	struct blkio_group *blkg, u64 read_bps);
ca32aefc	193	typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
fe071437	194	struct blkio_group *blkg, u64 write_bps);
ca32aefc	195	typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
fe071437	196	struct blkio_group *blkg, unsigned int read_iops);
ca32aefc	197	typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
fe071437	198	struct blkio_group *blkg, unsigned int write_iops);
3e252066 VG	199
3e252066 VG	200	struct blkio_policy_ops {
cd1604fa TH	201	blkio_alloc_group_fn *blkio_alloc_group_fn;
cd1604fa TH	202	blkio_link_group_fn *blkio_link_group_fn;
3e252066	203	blkio_unlink_group_fn *blkio_unlink_group_fn;
72e06c25	204	blkio_clear_queue_fn *blkio_clear_queue_fn;
3e252066	205	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
4c9eefa1 VG	206	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
4c9eefa1 VG	207	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
7702e8f4 VG	208	blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
7702e8f4 VG	209	blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
3e252066 VG	210	};
	211
	212	struct blkio_policy_type {
	213	struct list_head list;
	214	struct blkio_policy_ops ops;
062a644d	215	enum blkio_policy_id plid;
3e252066 VG	216	};
	217
	218	/* Blkio controller policy registration */
	219	extern void blkio_policy_register(struct blkio_policy_type *);
	220	extern void blkio_policy_unregister(struct blkio_policy_type *);
72e06c25	221	extern void blkg_destroy_all(struct request_queue *q);
3e252066	222
afc24d49 VG	223	static inline char blkg_path(struct blkio_group blkg)
	224	{
	225	return blkg->path;
	226	}
	227
2f5ea477 JA	228	#else
	229
	230	struct blkio_group {
	231	};
	232
3e252066 VG	233	struct blkio_policy_type {
	234	};
	235
	236	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	237	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
72e06c25	238	static inline void blkg_destroy_all(struct request_queue *q) { }
3e252066	239
afc24d49 VG	240	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
afc24d49 VG	241
2f5ea477 JA	242	#endif
2f5ea477 JA	243
df457f84	244	#define BLKIO_WEIGHT_MIN 10
31e4c28d VG	245	#define BLKIO_WEIGHT_MAX 1000
	246	#define BLKIO_WEIGHT_DEFAULT 500
	247
2868ef7b	248	#ifdef CONFIG_DEBUG_BLK_CGROUP
a11cdaa7	249	void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
9195291e	250	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	251	unsigned long dequeue);
812df48d DS	252	void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
812df48d DS	253	void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
e5ff082e	254	void blkiocg_set_start_empty_time(struct blkio_group *blkg);
812df48d DS	255
	256	#define BLKG_FLAG_FNS(name) \
	257	static inline void blkio_mark_blkg_##name( \
	258	struct blkio_group_stats *stats) \
	259	{ \
	260	stats->flags \|= (1 << BLKG_##name); \
	261	} \
	262	static inline void blkio_clear_blkg_##name( \
	263	struct blkio_group_stats *stats) \
	264	{ \
	265	stats->flags &= ~(1 << BLKG_##name); \
	266	} \
	267	static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
	268	{ \
	269	return (stats->flags & (1 << BLKG_##name)) != 0; \
	270	} \
	271
	272	BLKG_FLAG_FNS(waiting)
	273	BLKG_FLAG_FNS(idling)
	274	BLKG_FLAG_FNS(empty)
	275	#undef BLKG_FLAG_FNS
2868ef7b	276	#else
a11cdaa7	277	static inline void blkiocg_update_avg_queue_size_stats(
cdc1184c	278	struct blkio_group *blkg) {}
9195291e DS	279	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	280	unsigned long dequeue) {}
812df48d DS	281	static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
	282	{}
	283	static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
e5ff082e	284	static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
2868ef7b VG	285	#endif
2868ef7b VG	286
32e380ae	287	#ifdef CONFIG_BLK_CGROUP
31e4c28d VG	288	extern struct blkio_cgroup blkio_root_cgroup;
31e4c28d VG	289	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
70087dc3	290	extern struct blkio_cgroup task_blkio_cgroup(struct task_struct tsk);
31e4c28d	291	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
cd1604fa TH	292	extern struct blkio_group blkg_lookup(struct blkio_cgroup blkcg,
	293	struct request_queue *q,
	294	enum blkio_policy_id plid);
	295	struct blkio_group blkg_lookup_create(struct blkio_cgroup blkcg,
	296	struct request_queue *q,
	297	enum blkio_policy_id plid,
	298	bool for_root);
303a3acb	299	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	300	unsigned long time,
167400d3 JT	301	unsigned long unaccounted_time);
84c124da DS	302	void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
	303	bool direction, bool sync);
	304	void blkiocg_update_completion_stats(struct blkio_group *blkg,
	305	uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
812d4026 DS	306	void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
812d4026 DS	307	bool sync);
a11cdaa7	308	void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	309	struct blkio_group *curr_blkg, bool direction, bool sync);
a11cdaa7	310	void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	311	bool direction, bool sync);
31e4c28d	312	#else
2f5ea477	313	struct cgroup;
31e4c28d VG	314	static inline struct blkio_cgroup *
31e4c28d VG	315	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
70087dc3 VG	316	static inline struct blkio_cgroup *
70087dc3 VG	317	task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
31e4c28d	318
31e4c28d VG	319	static inline int
	320	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	321
cd1604fa TH	322	static inline struct blkio_group blkg_lookup(struct blkio_cgroup blkcg,
cd1604fa TH	323	void *key) { return NULL; }
303a3acb	324	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
167400d3 JT	325	unsigned long time,
	326	unsigned long unaccounted_time)
	327	{}
84c124da DS	328	static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
	329	uint64_t bytes, bool direction, bool sync) {}
	330	static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
	331	uint64_t start_time, uint64_t io_start_time, bool direction,
	332	bool sync) {}
812d4026 DS	333	static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
812d4026 DS	334	bool direction, bool sync) {}
a11cdaa7	335	static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
cdc1184c	336	struct blkio_group *curr_blkg, bool direction, bool sync) {}
a11cdaa7	337	static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
cdc1184c	338	bool direction, bool sync) {}
31e4c28d VG	339	#endif
31e4c28d VG	340	#endif /* _BLK_CGROUP_H */