4 * Common Block IO controller cgroup interface
6 * Based on ideas and code from CFQ, CFS and BFQ:
7 * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
9 * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
10 * Paolo Valente <paolo.valente@unimore.it>
12 * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
13 * Nauman Rafique <nauman@google.com>
16 #include <linux/cgroup.h>
19 struct cgroup_subsys_state css
;
22 struct hlist_head blkg_list
;
26 /* An rcu protected unique identifier for the group */
28 struct hlist_node blkcg_node
;
29 unsigned short blkcg_id
;
30 #ifdef CONFIG_DEBUG_BLK_CGROUP
31 /* Store cgroup path */
36 #define BLKIO_WEIGHT_MIN 100
37 #define BLKIO_WEIGHT_MAX 1000
38 #define BLKIO_WEIGHT_DEFAULT 500
40 #ifdef CONFIG_DEBUG_BLK_CGROUP
41 static inline char *blkg_path(struct blkio_group
*blkg
)
46 static inline char *blkg_path(struct blkio_group
*blkg
) { return NULL
; }
49 #ifdef CONFIG_BLK_CGROUP
50 extern struct blkio_cgroup blkio_root_cgroup
;
51 extern struct blkio_cgroup
*cgroup_to_blkio_cgroup(struct cgroup
*cgroup
);
52 extern void blkiocg_add_blkio_group(struct blkio_cgroup
*blkcg
,
53 struct blkio_group
*blkg
, void *key
);
54 extern int blkiocg_del_blkio_group(struct blkio_group
*blkg
);
55 extern struct blkio_group
*blkiocg_lookup_group(struct blkio_cgroup
*blkcg
,
58 static inline struct blkio_cgroup
*
59 cgroup_to_blkio_cgroup(struct cgroup
*cgroup
) { return NULL
; }
61 static inline void blkiocg_add_blkio_group(struct blkio_cgroup
*blkcg
,
62 struct blkio_group
*blkg
, void *key
)
67 blkiocg_del_blkio_group(struct blkio_group
*blkg
) { return 0; }
69 static inline struct blkio_group
*
70 blkiocg_lookup_group(struct blkio_cgroup
*blkcg
, void *key
) { return NULL
; }
72 #endif /* _BLK_CGROUP_H */