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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 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
19 | |
20 | #ifndef CONFIG_BLK_CGROUP |
21 | /* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */ |
22 | extern struct cgroup_subsys blkio_subsys; |
23 | #define blkio_subsys_id blkio_subsys.subsys_id |
24 | #endif |
25 | |
26 | struct blkio_cgroup { |
27 | struct cgroup_subsys_state css; |
28 | unsigned int weight; |
29 | spinlock_t lock; |
30 | struct hlist_head blkg_list; |
31 | }; |
32 | |
33 | struct blkio_group { |
34 | /* An rcu protected unique identifier for the group */ |
35 | void *key; |
36 | struct hlist_node blkcg_node; |
37 | unsigned short blkcg_id; |
38 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
39 | /* Store cgroup path */ |
40 | char path[128]; |
41 | /* How many times this group has been removed from service tree */ |
42 | unsigned long dequeue; |
43 | #endif |
44 | /* The device MKDEV(major, minor), this group has been created for */ |
45 | dev_t dev; |
46 | |
47 | /* total disk time and nr sectors dispatched by this group */ |
48 | unsigned long time; |
49 | unsigned long sectors; |
50 | }; |
51 | |
52 | typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); |
53 | typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, |
54 | unsigned int weight); |
55 | |
56 | struct blkio_policy_ops { |
57 | blkio_unlink_group_fn *blkio_unlink_group_fn; |
58 | blkio_update_group_weight_fn *blkio_update_group_weight_fn; |
59 | }; |
60 | |
61 | struct blkio_policy_type { |
62 | struct list_head list; |
63 | struct blkio_policy_ops ops; |
64 | }; |
65 | |
66 | /* Blkio controller policy registration */ |
67 | extern void blkio_policy_register(struct blkio_policy_type *); |
68 | extern void blkio_policy_unregister(struct blkio_policy_type *); |
69 | |
70 | #else |
71 | |
72 | struct blkio_group { |
73 | }; |
74 | |
75 | struct blkio_policy_type { |
76 | }; |
77 | |
78 | static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } |
79 | static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } |
80 | |
81 | #endif |
82 | |
83 | #define BLKIO_WEIGHT_MIN 100 |
84 | #define BLKIO_WEIGHT_MAX 1000 |
85 | #define BLKIO_WEIGHT_DEFAULT 500 |
86 | |
87 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
88 | static inline char *blkg_path(struct blkio_group *blkg) |
89 | { |
90 | return blkg->path; |
91 | } |
92 | void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, |
93 | unsigned long dequeue); |
94 | #else |
95 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } |
96 | static inline void blkiocg_update_blkio_group_dequeue_stats( |
97 | struct blkio_group *blkg, unsigned long dequeue) {} |
98 | #endif |
99 | |
100 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
101 | extern struct blkio_cgroup blkio_root_cgroup; |
102 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); |
103 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
104 | struct blkio_group *blkg, void *key, dev_t dev); |
105 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
106 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, |
107 | void *key); |
108 | void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
109 | unsigned long time, unsigned long sectors); |
110 | #else |
111 | struct cgroup; |
112 | static inline struct blkio_cgroup * |
113 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } |
114 | |
115 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
116 | struct blkio_group *blkg, void *key, dev_t dev) |
117 | { |
118 | } |
119 | |
120 | static inline int |
121 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } |
122 | |
123 | static inline struct blkio_group * |
124 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } |
125 | static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
126 | unsigned long time, unsigned long sectors) |
127 | { |
128 | } |
129 | #endif |
130 | #endif /* _BLK_CGROUP_H */ |
131 |
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