#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> #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) #ifndef CONFIG_BLK_CGROUP /* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */ extern struct cgroup_subsys blkio_subsys; #define blkio_subsys_id blkio_subsys.subsys_id #endif 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; }; typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, unsigned int weight); struct blkio_policy_ops { blkio_unlink_group_fn *blkio_unlink_group_fn; blkio_update_group_weight_fn *blkio_update_group_weight_fn; }; struct blkio_policy_type { struct list_head list; struct blkio_policy_ops ops; }; /* Blkio controller policy registration */ extern void blkio_policy_register(struct blkio_policy_type *); extern void blkio_policy_unregister(struct blkio_policy_type *); #else struct blkio_group { }; struct blkio_policy_type { }; static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } #endif #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 #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) 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 struct cgroup; 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 */