024f906616
There's no need to take css reference here, for the caller has already called rcu_read_lock() to prevent cgroup from being removed. Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
#ifndef _BLK_CGROUP_H
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#define _BLK_CGROUP_H
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/*
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* Common Block IO controller cgroup interface
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*
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* Based on ideas and code from CFQ, CFS and BFQ:
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
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*
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* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
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* Paolo Valente <paolo.valente@unimore.it>
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*
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* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
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* Nauman Rafique <nauman@google.com>
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*/
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#include <linux/cgroup.h>
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#ifdef CONFIG_BLK_CGROUP
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struct blkio_cgroup {
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struct cgroup_subsys_state css;
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unsigned int weight;
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spinlock_t lock;
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struct hlist_head blkg_list;
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};
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struct blkio_group {
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/* An rcu protected unique identifier for the group */
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void *key;
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struct hlist_node blkcg_node;
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unsigned short blkcg_id;
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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/* Store cgroup path */
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char path[128];
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/* How many times this group has been removed from service tree */
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unsigned long dequeue;
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#endif
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/* The device MKDEV(major, minor), this group has been created for */
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dev_t dev;
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/* total disk time and nr sectors dispatched by this group */
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unsigned long time;
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unsigned long sectors;
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};
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typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
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typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
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unsigned int weight);
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struct blkio_policy_ops {
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blkio_unlink_group_fn *blkio_unlink_group_fn;
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blkio_update_group_weight_fn *blkio_update_group_weight_fn;
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};
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struct blkio_policy_type {
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struct list_head list;
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struct blkio_policy_ops ops;
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};
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/* Blkio controller policy registration */
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extern void blkio_policy_register(struct blkio_policy_type *);
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extern void blkio_policy_unregister(struct blkio_policy_type *);
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#else
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struct blkio_group {
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};
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struct blkio_policy_type {
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};
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static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
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static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
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#endif
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#define BLKIO_WEIGHT_MIN 100
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#define BLKIO_WEIGHT_MAX 1000
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#define BLKIO_WEIGHT_DEFAULT 500
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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static inline char *blkg_path(struct blkio_group *blkg)
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{
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return blkg->path;
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}
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void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
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unsigned long dequeue);
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#else
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static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
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static inline void blkiocg_update_blkio_group_dequeue_stats(
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struct blkio_group *blkg, unsigned long dequeue) {}
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#endif
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#ifdef CONFIG_BLK_CGROUP
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extern struct blkio_cgroup blkio_root_cgroup;
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extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
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extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
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struct blkio_group *blkg, void *key, dev_t dev);
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extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
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extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
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void *key);
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void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
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unsigned long time, unsigned long sectors);
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#else
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struct cgroup;
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static inline struct blkio_cgroup *
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cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
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static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
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struct blkio_group *blkg, void *key, dev_t dev)
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{
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}
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static inline int
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blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
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static inline struct blkio_group *
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blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
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static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
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unsigned long time, unsigned long sectors)
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{
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}
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#endif
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#endif /* _BLK_CGROUP_H */
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