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Commit 9a9e8a26 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

blkcg: add blkcg->id 



Add 64bit unique id to blkcg.  This will be used by policies which
want blkcg identity test to tell whether the associated blkcg has
changed.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent edf1b879

block/blk-cgroup.c

+3 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/slab.h>

#include <linux/genhd.h>

#include <linux/delay.h>

#include <linux/atomic.h>

#include "blk-cgroup.h"

#include "blk.h"
@@ -1622,6 +1623,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) 
static struct cgroup_subsys_state *

blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)

{

	static atomic64_t id_seq = ATOMIC64_INIT(0);

	struct blkio_cgroup *blkcg;

	struct cgroup *parent = cgroup->parent;
@@ -1635,6 +1637,7 @@ blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) 
		return ERR_PTR(-ENOMEM);



	blkcg->weight = BLKIO_WEIGHT_DEFAULT;

	blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */

done:

	spin_lock_init(&blkcg->lock);

	INIT_HLIST_HEAD(&blkcg->blkg_list);

block/blk-cgroup.h

+3 −0
Original line number Diff line number Diff line
@@ -116,6 +116,9 @@ struct blkio_cgroup { 
	unsigned int weight;

	spinlock_t lock;

	struct hlist_head blkg_list;



	/* for policies to test whether associated blkcg has changed */

	uint64_t id;

};



struct blkio_group_stats {