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blkcg: remove static policy ID enums

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Remove BLKIO_POLICY_* enums and let blkio_policy_register() allocate
@pol->plid dynamically on registration.  The maximum number of blkcg
policies which can be registered at the same time is defined by
BLKCG_MAX_POLS constant added to include/linux/blkdev.h.

Note that blkio_policy_register() now may fail.  Policy init functions
updated accordingly and unnecessary ifdefs removed from cfq_init().

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2012-04-13 13:11:28 -07:00
committed by Jens Axboe
parent ec399347d3
commit 8bd435b30e
5 changed files with 69 additions and 41 deletions
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7
include/linux/blkdev.h
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@ -35,6 +35,12 @@ struct bsg_job;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
/*
* Maximum number of blkcg policies allowed to be registered concurrently.
* Defined here to simplify include dependency.
*/
#define BLKCG_MAX_POLS 2
struct request;
typedef void (rq_end_io_fn)(struct request *, int);
@ -363,7 +369,6 @@ struct request_queue {
struct list_head icq_list;
#ifdef CONFIG_BLK_CGROUP
/* XXX: array size hardcoded to avoid include dependency (temporary) */
struct list_head blkg_list;
#endif