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Subject[PATCH 15/21] blkcg: add blkio_policy_ops operations for exit and stat reset
Date
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>
---
block/blk-cgroup.c | 16 ++++++++++++----
block/blk-cgroup.h | 4 ++++
2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 16158e5..e4848ee 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -131,12 +131,17 @@ static void blkg_free(struct blkio_group *blkg)
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 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
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 @@ struct blkio_group {
};

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 {
--
1.7.7.3


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