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: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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2 changed files with 6 additions and 0 deletions
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@ -19,6 +19,7 @@
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/genhd.h>
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#include <linux/genhd.h>
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#include <linux/delay.h>
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#include <linux/delay.h>
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#include <linux/atomic.h>
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#include "blk-cgroup.h"
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#include "blk-cgroup.h"
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#include "blk.h"
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#include "blk.h"
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@ -1622,6 +1623,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
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static struct cgroup_subsys_state *
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static struct cgroup_subsys_state *
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blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
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blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
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{
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{
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static atomic64_t id_seq = ATOMIC64_INIT(0);
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struct blkio_cgroup *blkcg;
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struct blkio_cgroup *blkcg;
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struct cgroup *parent = cgroup->parent;
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struct cgroup *parent = cgroup->parent;
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@ -1635,6 +1637,7 @@ blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
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return ERR_PTR(-ENOMEM);
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return ERR_PTR(-ENOMEM);
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blkcg->weight = BLKIO_WEIGHT_DEFAULT;
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blkcg->weight = BLKIO_WEIGHT_DEFAULT;
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blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */
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done:
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done:
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spin_lock_init(&blkcg->lock);
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spin_lock_init(&blkcg->lock);
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INIT_HLIST_HEAD(&blkcg->blkg_list);
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INIT_HLIST_HEAD(&blkcg->blkg_list);
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@ -116,6 +116,9 @@ struct blkio_cgroup {
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unsigned int weight;
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unsigned int weight;
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spinlock_t lock;
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spinlock_t lock;
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struct hlist_head blkg_list;
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struct hlist_head blkg_list;
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/* for policies to test whether associated blkcg has changed */
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uint64_t id;
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};
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};
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struct blkio_group_stats {
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struct blkio_group_stats {
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