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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 | ||
67523c48 BB |
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 | |
2f5ea477 | 25 | |
303a3acb DS |
26 | enum io_type { |
27 | IO_READ = 0, | |
28 | IO_WRITE, | |
29 | IO_SYNC, | |
30 | IO_ASYNC, | |
31 | IO_TYPE_MAX | |
32 | }; | |
33 | ||
31e4c28d VG |
34 | struct blkio_cgroup { |
35 | struct cgroup_subsys_state css; | |
36 | unsigned int weight; | |
37 | spinlock_t lock; | |
38 | struct hlist_head blkg_list; | |
39 | }; | |
40 | ||
303a3acb DS |
41 | struct blkio_group_stats { |
42 | /* total disk time and nr sectors dispatched by this group */ | |
43 | uint64_t time; | |
44 | uint64_t sectors; | |
45 | /* Total disk time used by IOs in ns */ | |
46 | uint64_t io_service_time[IO_TYPE_MAX]; | |
47 | uint64_t io_service_bytes[IO_TYPE_MAX]; /* Total bytes transferred */ | |
48 | /* Total IOs serviced, post merge */ | |
49 | uint64_t io_serviced[IO_TYPE_MAX]; | |
50 | /* Total time spent waiting in scheduler queue in ns */ | |
51 | uint64_t io_wait_time[IO_TYPE_MAX]; | |
52 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
53 | /* How many times this group has been removed from service tree */ | |
54 | unsigned long dequeue; | |
55 | #endif | |
56 | }; | |
57 | ||
31e4c28d VG |
58 | struct blkio_group { |
59 | /* An rcu protected unique identifier for the group */ | |
60 | void *key; | |
61 | struct hlist_node blkcg_node; | |
b1c35769 | 62 | unsigned short blkcg_id; |
2868ef7b VG |
63 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
64 | /* Store cgroup path */ | |
65 | char path[128]; | |
66 | #endif | |
22084190 VG |
67 | /* The device MKDEV(major, minor), this group has been created for */ |
68 | dev_t dev; | |
69 | ||
303a3acb DS |
70 | /* Need to serialize the stats in the case of reset/update */ |
71 | spinlock_t stats_lock; | |
72 | struct blkio_group_stats stats; | |
31e4c28d VG |
73 | }; |
74 | ||
3e252066 VG |
75 | typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); |
76 | typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, | |
77 | unsigned int weight); | |
78 | ||
79 | struct blkio_policy_ops { | |
80 | blkio_unlink_group_fn *blkio_unlink_group_fn; | |
81 | blkio_update_group_weight_fn *blkio_update_group_weight_fn; | |
82 | }; | |
83 | ||
84 | struct blkio_policy_type { | |
85 | struct list_head list; | |
86 | struct blkio_policy_ops ops; | |
87 | }; | |
88 | ||
89 | /* Blkio controller policy registration */ | |
90 | extern void blkio_policy_register(struct blkio_policy_type *); | |
91 | extern void blkio_policy_unregister(struct blkio_policy_type *); | |
92 | ||
2f5ea477 JA |
93 | #else |
94 | ||
95 | struct blkio_group { | |
96 | }; | |
97 | ||
3e252066 VG |
98 | struct blkio_policy_type { |
99 | }; | |
100 | ||
101 | static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } | |
102 | static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } | |
103 | ||
2f5ea477 JA |
104 | #endif |
105 | ||
31e4c28d VG |
106 | #define BLKIO_WEIGHT_MIN 100 |
107 | #define BLKIO_WEIGHT_MAX 1000 | |
108 | #define BLKIO_WEIGHT_DEFAULT 500 | |
109 | ||
2868ef7b VG |
110 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
111 | static inline char *blkg_path(struct blkio_group *blkg) | |
112 | { | |
113 | return blkg->path; | |
114 | } | |
22084190 VG |
115 | void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, |
116 | unsigned long dequeue); | |
2868ef7b VG |
117 | #else |
118 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } | |
22084190 VG |
119 | static inline void blkiocg_update_blkio_group_dequeue_stats( |
120 | struct blkio_group *blkg, unsigned long dequeue) {} | |
2868ef7b VG |
121 | #endif |
122 | ||
67523c48 | 123 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
31e4c28d VG |
124 | extern struct blkio_cgroup blkio_root_cgroup; |
125 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
126 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
22084190 | 127 | struct blkio_group *blkg, void *key, dev_t dev); |
31e4c28d VG |
128 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
129 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, | |
130 | void *key); | |
303a3acb DS |
131 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
132 | unsigned long time); | |
31e4c28d | 133 | #else |
2f5ea477 | 134 | struct cgroup; |
31e4c28d VG |
135 | static inline struct blkio_cgroup * |
136 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
137 | ||
138 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
22084190 | 139 | struct blkio_group *blkg, void *key, dev_t dev) |
31e4c28d VG |
140 | { |
141 | } | |
142 | ||
143 | static inline int | |
144 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } | |
145 | ||
146 | static inline struct blkio_group * | |
147 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } | |
303a3acb | 148 | static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
9a0785b0 | 149 | unsigned long time) {} |
31e4c28d VG |
150 | #endif |
151 | #endif /* _BLK_CGROUP_H */ |