Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 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; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame^] | 29 | unsigned short blkcg_id; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 30 | }; |
| 31 | |
| 32 | #define BLKIO_WEIGHT_MIN 100 |
| 33 | #define BLKIO_WEIGHT_MAX 1000 |
| 34 | #define BLKIO_WEIGHT_DEFAULT 500 |
| 35 | |
| 36 | #ifdef CONFIG_BLK_CGROUP |
| 37 | extern struct blkio_cgroup blkio_root_cgroup; |
| 38 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); |
| 39 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| 40 | struct blkio_group *blkg, void *key); |
| 41 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
| 42 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, |
| 43 | void *key); |
| 44 | #else |
| 45 | static inline struct blkio_cgroup * |
| 46 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } |
| 47 | |
| 48 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| 49 | struct blkio_group *blkg, void *key) |
| 50 | { |
| 51 | } |
| 52 | |
| 53 | static inline int |
| 54 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } |
| 55 | |
| 56 | static inline struct blkio_group * |
| 57 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } |
| 58 | #endif |
| 59 | #endif /* _BLK_CGROUP_H */ |