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-rw-r--r--block/blk-cgroup.h127
1 files changed, 127 insertions, 0 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
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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
18#ifdef CONFIG_BLK_CGROUP
19
20struct blkio_cgroup {
21 struct cgroup_subsys_state css;
22 unsigned int weight;
23 spinlock_t lock;
24 struct hlist_head blkg_list;
25};
26
27struct blkio_group {
28 /* An rcu protected unique identifier for the group */
29 void *key;
30 struct hlist_node blkcg_node;
31 unsigned short blkcg_id;
32#ifdef CONFIG_DEBUG_BLK_CGROUP
33 /* Store cgroup path */
34 char path[128];
35 /* How many times this group has been removed from service tree */
36 unsigned long dequeue;
37#endif
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;
44};
45
46extern bool blkiocg_css_tryget(struct blkio_cgroup *blkcg);
47extern void blkiocg_css_put(struct blkio_cgroup *blkcg);
48
49typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
50typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
51 unsigned int weight);
52
53struct blkio_policy_ops {
54 blkio_unlink_group_fn *blkio_unlink_group_fn;
55 blkio_update_group_weight_fn *blkio_update_group_weight_fn;
56};
57
58struct blkio_policy_type {
59 struct list_head list;
60 struct blkio_policy_ops ops;
61};
62
63/* Blkio controller policy registration */
64extern void blkio_policy_register(struct blkio_policy_type *);
65extern void blkio_policy_unregister(struct blkio_policy_type *);
66
67#else
68
69struct blkio_group {
70};
71
72struct blkio_policy_type {
73};
74
75static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
76static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
77
78#endif
79
80#define BLKIO_WEIGHT_MIN 100
81#define BLKIO_WEIGHT_MAX 1000
82#define BLKIO_WEIGHT_DEFAULT 500
83
84#ifdef CONFIG_DEBUG_BLK_CGROUP
85static inline char *blkg_path(struct blkio_group *blkg)
86{
87 return blkg->path;
88}
89void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
90 unsigned long dequeue);
91#else
92static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
93static inline void blkiocg_update_blkio_group_dequeue_stats(
94 struct blkio_group *blkg, unsigned long dequeue) {}
95#endif
96
97#ifdef CONFIG_BLK_CGROUP
98extern struct blkio_cgroup blkio_root_cgroup;
99extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
100extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
101 struct blkio_group *blkg, void *key, dev_t dev);
102extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
103extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
104 void *key);
105void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
106 unsigned long time, unsigned long sectors);
107#else
108struct cgroup;
109static inline struct blkio_cgroup *
110cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
111
112static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
113 struct blkio_group *blkg, void *key, dev_t dev)
114{
115}
116
117static inline int
118blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
119
120static inline struct blkio_group *
121blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
122static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
123 unsigned long time, unsigned long sectors)
124{
125}
126#endif
127#endif /* _BLK_CGROUP_H */
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