blkcg: add blkio_policy_ops operations for exit and stat reset
Add blkio_policy_ops->blkio_exit_group_fn() and
->blkio_reset_group_stats_fn(). These will be used to further
modularize blkcg policy implementation.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 19ee29f..2e6fb7d 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -131,12 +131,17 @@
return;
for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+ struct blkio_policy_type *pol = blkio_policy[i];
struct blkg_policy_data *pd = blkg->pd[i];
- if (pd) {
- free_percpu(pd->stats_cpu);
- kfree(pd);
- }
+ if (!pd)
+ continue;
+
+ if (pol && pol->ops.blkio_exit_group_fn)
+ pol->ops.blkio_exit_group_fn(blkg);
+
+ free_percpu(pd->stats_cpu);
+ kfree(pd);
}
kfree(blkg);
@@ -432,6 +437,9 @@
blkg_stat_reset(&stats->empty_time);
#endif
blkio_reset_stats_cpu(blkg, pol->plid);
+
+ if (pol->ops.blkio_reset_group_stats_fn)
+ pol->ops.blkio_reset_group_stats_fn(blkg);
}
}
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index c82de47..d0ee649 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -153,9 +153,13 @@
};
typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
+typedef void (blkio_exit_group_fn)(struct blkio_group *blkg);
+typedef void (blkio_reset_group_stats_fn)(struct blkio_group *blkg);
struct blkio_policy_ops {
blkio_init_group_fn *blkio_init_group_fn;
+ blkio_exit_group_fn *blkio_exit_group_fn;
+ blkio_reset_group_stats_fn *blkio_reset_group_stats_fn;
};
struct blkio_policy_type {