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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 | ||
2f5ea477 JA |
18 | #ifdef CONFIG_BLK_CGROUP |
19 | ||
31e4c28d VG |
20 | struct blkio_cgroup { |
21 | struct cgroup_subsys_state css; | |
22 | unsigned int weight; | |
23 | spinlock_t lock; | |
24 | struct hlist_head blkg_list; | |
25 | }; | |
26 | ||
27 | struct blkio_group { | |
28 | /* An rcu protected unique identifier for the group */ | |
29 | void *key; | |
30 | struct hlist_node blkcg_node; | |
b1c35769 | 31 | unsigned short blkcg_id; |
2868ef7b VG |
32 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
33 | /* Store cgroup path */ | |
34 | char path[128]; | |
22084190 VG |
35 | /* How many times this group has been removed from service tree */ |
36 | unsigned long dequeue; | |
2868ef7b | 37 | #endif |
22084190 VG |
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; | |
31e4c28d VG |
44 | }; |
45 | ||
9d6a986c VG |
46 | extern bool blkiocg_css_tryget(struct blkio_cgroup *blkcg); |
47 | extern void blkiocg_css_put(struct blkio_cgroup *blkcg); | |
48 | ||
3e252066 VG |
49 | typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); |
50 | typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, | |
51 | unsigned int weight); | |
52 | ||
53 | struct 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 | ||
58 | struct blkio_policy_type { | |
59 | struct list_head list; | |
60 | struct blkio_policy_ops ops; | |
61 | }; | |
62 | ||
63 | /* Blkio controller policy registration */ | |
64 | extern void blkio_policy_register(struct blkio_policy_type *); | |
65 | extern void blkio_policy_unregister(struct blkio_policy_type *); | |
66 | ||
2f5ea477 JA |
67 | #else |
68 | ||
69 | struct blkio_group { | |
70 | }; | |
71 | ||
3e252066 VG |
72 | struct blkio_policy_type { |
73 | }; | |
74 | ||
75 | static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } | |
76 | static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } | |
77 | ||
2f5ea477 JA |
78 | #endif |
79 | ||
31e4c28d VG |
80 | #define BLKIO_WEIGHT_MIN 100 |
81 | #define BLKIO_WEIGHT_MAX 1000 | |
82 | #define BLKIO_WEIGHT_DEFAULT 500 | |
83 | ||
2868ef7b VG |
84 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
85 | static inline char *blkg_path(struct blkio_group *blkg) | |
86 | { | |
87 | return blkg->path; | |
88 | } | |
22084190 VG |
89 | void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, |
90 | unsigned long dequeue); | |
2868ef7b VG |
91 | #else |
92 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } | |
22084190 VG |
93 | static inline void blkiocg_update_blkio_group_dequeue_stats( |
94 | struct blkio_group *blkg, unsigned long dequeue) {} | |
2868ef7b VG |
95 | #endif |
96 | ||
31e4c28d VG |
97 | #ifdef CONFIG_BLK_CGROUP |
98 | extern struct blkio_cgroup blkio_root_cgroup; | |
99 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
100 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
22084190 | 101 | struct blkio_group *blkg, void *key, dev_t dev); |
31e4c28d VG |
102 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
103 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, | |
104 | void *key); | |
22084190 VG |
105 | void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
106 | unsigned long time, unsigned long sectors); | |
31e4c28d | 107 | #else |
2f5ea477 | 108 | struct cgroup; |
31e4c28d VG |
109 | static inline struct blkio_cgroup * |
110 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
111 | ||
112 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
22084190 | 113 | struct blkio_group *blkg, void *key, dev_t dev) |
31e4c28d VG |
114 | { |
115 | } | |
116 | ||
117 | static inline int | |
118 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } | |
119 | ||
120 | static inline struct blkio_group * | |
121 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } | |
22084190 VG |
122 | static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
123 | unsigned long time, unsigned long sectors) | |
124 | { | |
125 | } | |
31e4c28d VG |
126 | #endif |
127 | #endif /* _BLK_CGROUP_H */ |