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

/* SPDX-License-Identifier: GPL-2.0 */
#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/types.h>

struct bio;
struct cgroup_subsys_state;
struct request_queue;

#define FC_APPID_LEN              129

#ifdef CONFIG_BLK_CGROUP
extern struct cgroup_subsys_state * const blkcg_root_css;

void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay);
void blkcg_maybe_throttle_current(void);
bool blk_cgroup_congested(void);
void blkcg_pin_online(struct cgroup_subsys_state *blkcg_css);
void blkcg_unpin_online(struct cgroup_subsys_state *blkcg_css);
struct list_head *blkcg_get_cgwb_list(struct cgroup_subsys_state *css);
struct cgroup_subsys_state *bio_blkcg_css(struct bio *bio);

#else	/* CONFIG_BLK_CGROUP */

#define blkcg_root_css	((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))

static inline void blkcg_maybe_throttle_current(void) { }
static inline bool blk_cgroup_congested(void) { return false; }
static inline void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay) { }
static inline struct cgroup_subsys_state *bio_blkcg_css(struct bio *bio)
{
	return NULL;
}
#endif	/* CONFIG_BLK_CGROUP */

int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len);
char *blkcg_get_fc_appid(struct bio *bio);

#endif	/* _BLK_CGROUP_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
31e4c28d VG	2	#ifndef _BLK_CGROUP_H
	3	#define _BLK_CGROUP_H
	4	/*
	5	* Common Block IO controller cgroup interface
	6	*
	7	* Based on ideas and code from CFQ, CFS and BFQ:
	8	* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
	9	*
	10	* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
	11	* Paolo Valente <paolo.valente@unimore.it>
	12	*
	13	* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
	14	* Nauman Rafique <nauman@google.com>
	15	*/
	16
c97ab271 CH	17	#include <linux/types.h>
	18
	19	struct bio;
	20	struct cgroup_subsys_state;
	21	struct request_queue;
31e4c28d	22
d2bcbeab MK	23	#define FC_APPID_LEN 129
d2bcbeab MK	24
f48ec1d7	25	#ifdef CONFIG_BLK_CGROUP
496d5e75	26	extern struct cgroup_subsys_state * const blkcg_root_css;
0fe061b9	27
672fdcf0 ML	28	void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay);
672fdcf0 ML	29	void blkcg_maybe_throttle_current(void);
216889aa	30	bool blk_cgroup_congested(void);
397c9f46 CH	31	void blkcg_pin_online(struct cgroup_subsys_state *blkcg_css);
397c9f46 CH	32	void blkcg_unpin_online(struct cgroup_subsys_state *blkcg_css);
dec223c9	33	struct list_head blkcg_get_cgwb_list(struct cgroup_subsys_state css);
bbb1ebe7	34	struct cgroup_subsys_state bio_blkcg_css(struct bio bio);
59b57717	35
36558c8a TH	36	#else /* CONFIG_BLK_CGROUP */
36558c8a TH	37
496d5e75 TH	38	#define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
496d5e75 TH	39
d09d8df3 JB	40	static inline void blkcg_maybe_throttle_current(void) { }
d09d8df3 JB	41	static inline bool blk_cgroup_congested(void) { return false; }
d09d8df3	42	static inline void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay) { }
bbb1ebe7 CH	43	static inline struct cgroup_subsys_state bio_blkcg_css(struct bio bio)
	44	{
	45	return NULL;
	46	}
36558c8a	47	#endif /* CONFIG_BLK_CGROUP */
d2bcbeab	48
db056284 CH	49	int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len);
db056284 CH	50	char blkcg_get_fc_appid(struct bio bio);
d2bcbeab	51
36558c8a	52	#endif /* _BLK_CGROUP_H */