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-rw-r--r--block/blk-cgroup.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 586c0ac3309a..f2b292925ccd 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -164,6 +164,10 @@ u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off);
u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
int off);
+u64 blkg_stat_recursive_sum(struct blkg_policy_data *pd, int off);
+struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkg_policy_data *pd,
+ int off);
+
struct blkg_conf_ctx {
struct gendisk *disk;
struct blkcg_gq *blkg;
@@ -414,6 +418,18 @@ static inline void blkg_stat_reset(struct blkg_stat *stat)
}
/**
+ * blkg_stat_merge - merge a blkg_stat into another
+ * @to: the destination blkg_stat
+ * @from: the source
+ *
+ * Add @from's count to @to.
+ */
+static inline void blkg_stat_merge(struct blkg_stat *to, struct blkg_stat *from)
+{
+ blkg_stat_add(to, blkg_stat_read(from));
+}
+
+/**
* blkg_rwstat_add - add a value to a blkg_rwstat
* @rwstat: target blkg_rwstat
* @rw: mask of REQ_{WRITE|SYNC}
@@ -484,6 +500,25 @@ static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
memset(rwstat->cnt, 0, sizeof(rwstat->cnt));
}
+/**
+ * blkg_rwstat_merge - merge a blkg_rwstat into another
+ * @to: the destination blkg_rwstat
+ * @from: the source
+ *
+ * Add @from's counts to @to.
+ */
+static inline void blkg_rwstat_merge(struct blkg_rwstat *to,
+ struct blkg_rwstat *from)
+{
+ struct blkg_rwstat v = blkg_rwstat_read(from);
+ int i;
+
+ u64_stats_update_begin(&to->syncp);
+ for (i = 0; i < BLKG_RWSTAT_NR; i++)
+ to->cnt[i] += v.cnt[i];
+ u64_stats_update_end(&to->syncp);
+}
+
#else /* CONFIG_BLK_CGROUP */
struct cgroup;