blkcg: export conf/stat helpers to prepare for reorganization

conf/stat handling is about to be moved to policy implementation from
blkcg core.  Export conf/stat helpers from blkcg core so that
blk-throttle and cfq-iosched can use them.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 108ffbf0d184..361ecfa4d28d 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -15,6 +15,7 @@
 
 #include <linux/cgroup.h>
 #include <linux/u64_stats_sync.h>
+#include <linux/seq_file.h>
 
 enum blkio_policy_id {
         BLKIO_POLICY_PROP = 0,          /* Proportional Bandwidth division */
@@ -193,6 +194,32 @@ extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
 extern void update_root_blkg_pd(struct request_queue *q,
                                 enum blkio_policy_id plid);
 
+void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
+                       u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int),
+                       int pol, int data, bool show_total);
+u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v);
+u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+                         const struct blkg_rwstat *rwstat);
+int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft,
+                     struct seq_file *sf);
+int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
+                       struct seq_file *sf);
+int blkcg_print_cpu_stat(struct cgroup *cgrp, struct cftype *cft,
+                         struct seq_file *sf);
+int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft,
+                           struct seq_file *sf);
+
+struct blkg_conf_ctx {
+        struct gendisk          *disk;
+        struct blkio_group      *blkg;
+        u64                     v;
+};
+
+int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
+                   struct blkg_conf_ctx *ctx);
+void blkg_conf_finish(struct blkg_conf_ctx *ctx);
+
+
 /**
  * blkg_to_pdata - get policy private data
  * @blkg: blkg of interest