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; | |
| b1c35769 | 29 | unsigned short blkcg_id; |
| 2868ef7b VG |
30 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 31 | /* Store cgroup path */ | |
| 32 | char path[128]; | |
| 22084190 VG |
33 | /* How many times this group has been removed from service tree */ |
| 34 | unsigned long dequeue; | |
| 2868ef7b | 35 | #endif |
| 22084190 VG |
36 | /* The device MKDEV(major, minor), this group has been created for */ |
| 37 | dev_t dev; | |
| 38 | ||
| 39 | /* total disk time and nr sectors dispatched by this group */ | |
| 40 | unsigned long time; | |
| 41 | unsigned long sectors; | |
| 31e4c28d VG |
42 | }; |
| 43 | ||
| 44 | #define BLKIO_WEIGHT_MIN 100 | |
| 45 | #define BLKIO_WEIGHT_MAX 1000 | |
| 46 | #define BLKIO_WEIGHT_DEFAULT 500 | |
| 47 | ||
| 2868ef7b VG |
48 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 49 | static inline char *blkg_path(struct blkio_group *blkg) | |
| 50 | { | |
| 51 | return blkg->path; | |
| 52 | } | |
| 22084190 VG |
53 | void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, |
| 54 | unsigned long dequeue); | |
| 2868ef7b VG |
55 | #else |
| 56 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } | |
| 22084190 VG |
57 | static inline void blkiocg_update_blkio_group_dequeue_stats( |
| 58 | struct blkio_group *blkg, unsigned long dequeue) {} | |
| 2868ef7b VG |
59 | #endif |
| 60 | ||
| 31e4c28d VG |
61 | #ifdef CONFIG_BLK_CGROUP |
| 62 | extern struct blkio_cgroup blkio_root_cgroup; | |
| 63 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
| 64 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
| 22084190 | 65 | struct blkio_group *blkg, void *key, dev_t dev); |
| 31e4c28d VG |
66 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
| 67 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, | |
| 68 | void *key); | |
| 22084190 VG |
69 | void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
| 70 | unsigned long time, unsigned long sectors); | |
| 31e4c28d VG |
71 | #else |
| 72 | static inline struct blkio_cgroup * | |
| 73 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
| 74 | ||
| 75 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
| 22084190 | 76 | struct blkio_group *blkg, void *key, dev_t dev) |
| 31e4c28d VG |
77 | { |
| 78 | } | |
| 79 | ||
| 80 | static inline int | |
| 81 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } | |
| 82 | ||
| 83 | static inline struct blkio_group * | |
| 84 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } | |
| 22084190 VG |
85 | static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
| 86 | unsigned long time, unsigned long sectors) | |
| 87 | { | |
| 88 | } | |
| 31e4c28d VG |
89 | #endif |
| 90 | #endif /* _BLK_CGROUP_H */ |