| #ifndef _BLK_CGROUP_H |
| #define _BLK_CGROUP_H |
| /* |
| * Common Block IO controller cgroup interface |
| * |
| * Based on ideas and code from CFQ, CFS and BFQ: |
| * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
| * |
| * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> |
| * Paolo Valente <paolo.valente@unimore.it> |
| * |
| * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> |
| * Nauman Rafique <nauman@google.com> |
| */ |
| |
| #include <linux/cgroup.h> |
| |
| struct blkio_cgroup { |
| struct cgroup_subsys_state css; |
| unsigned int weight; |
| spinlock_t lock; |
| struct hlist_head blkg_list; |
| }; |
| |
| struct blkio_group { |
| /* An rcu protected unique identifier for the group */ |
| void *key; |
| struct hlist_node blkcg_node; |
| unsigned short blkcg_id; |
| #ifdef CONFIG_DEBUG_BLK_CGROUP |
| /* Store cgroup path */ |
| char path[128]; |
| /* How many times this group has been removed from service tree */ |
| unsigned long dequeue; |
| #endif |
| /* The device MKDEV(major, minor), this group has been created for */ |
| dev_t dev; |
| |
| /* total disk time and nr sectors dispatched by this group */ |
| unsigned long time; |
| unsigned long sectors; |
| }; |
| |
| #define BLKIO_WEIGHT_MIN 100 |
| #define BLKIO_WEIGHT_MAX 1000 |
| #define BLKIO_WEIGHT_DEFAULT 500 |
| |
| #ifdef CONFIG_DEBUG_BLK_CGROUP |
| static inline char *blkg_path(struct blkio_group *blkg) |
| { |
| return blkg->path; |
| } |
| void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg, |
| unsigned long dequeue); |
| #else |
| static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } |
| static inline void blkiocg_update_blkio_group_dequeue_stats( |
| struct blkio_group *blkg, unsigned long dequeue) {} |
| #endif |
| |
| #ifdef CONFIG_BLK_CGROUP |
| extern struct blkio_cgroup blkio_root_cgroup; |
| extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); |
| extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| struct blkio_group *blkg, void *key, dev_t dev); |
| extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
| extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, |
| void *key); |
| void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
| unsigned long time, unsigned long sectors); |
| #else |
| static inline struct blkio_cgroup * |
| cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } |
| |
| static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| struct blkio_group *blkg, void *key, dev_t dev) |
| { |
| } |
| |
| static inline int |
| blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } |
| |
| static inline struct blkio_group * |
| blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } |
| static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg, |
| unsigned long time, unsigned long sectors) |
| { |
| } |
| #endif |
| #endif /* _BLK_CGROUP_H */ |