projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |