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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 | ||
18 | struct blkio_cgroup { | |
19 | struct cgroup_subsys_state css; | |
20 | unsigned int weight; | |
21 | spinlock_t lock; | |
22 | struct hlist_head blkg_list; | |
23 | }; | |
24 | ||
25 | struct blkio_group { | |
26 | /* An rcu protected unique identifier for the group */ | |
27 | void *key; | |
28 | struct hlist_node blkcg_node; | |
29 | }; | |
30 | ||
31 | #define BLKIO_WEIGHT_MIN 100 | |
32 | #define BLKIO_WEIGHT_MAX 1000 | |
33 | #define BLKIO_WEIGHT_DEFAULT 500 | |
34 | ||
35 | #ifdef CONFIG_BLK_CGROUP | |
36 | extern struct blkio_cgroup blkio_root_cgroup; | |
37 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
38 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
39 | struct blkio_group *blkg, void *key); | |
40 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); | |
41 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, | |
42 | void *key); | |
43 | #else | |
44 | static inline struct blkio_cgroup * | |
45 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
46 | ||
47 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
48 | struct blkio_group *blkg, void *key) | |
49 | { | |
50 | } | |
51 | ||
52 | static inline int | |
53 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } | |
54 | ||
55 | static inline struct blkio_group * | |
56 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } | |
57 | #endif | |
58 | #endif /* _BLK_CGROUP_H */ |