blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros

Now that all stat handling code lives in policy implementations,
there's no need to encode policy ID in cft->private.

* Export blkcg_prfill_[rw]stat() from blkcg, remove
  blkcg_print_[rw]stat(), and implement cfqg_print_[rw]stat() which
  use hard-code BLKIO_POLICY_PROP.

* Use cft->private for offset of the target field directly and drop
  BLKCG_STAT_{PRIV|POL|OFF}().

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

1 files changed, 20 insertions, 28 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 7de19d7954c7..9449c383b7ba 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -430,43 +430,35 @@ u64 __blkg_prfill_rwstat(struct seq_file *sf, void *pdata,
         return v;
 }
 
-static u64 blkg_prfill_stat(struct seq_file *sf, void *pdata, int off)
+/**
+ * blkg_prfill_stat - prfill callback for blkg_stat
+ * @sf: seq_file to print to
+ * @pdata: policy private data of interest
+ * @off: offset to the blkg_stat in @pdata
+ *
+ * prfill callback for printing a blkg_stat.
+ */
+u64 blkg_prfill_stat(struct seq_file *sf, void *pdata, int off)
 {
         return __blkg_prfill_u64(sf, pdata, blkg_stat_read(pdata + off));
 }
+EXPORT_SYMBOL_GPL(blkg_prfill_stat);
 
-static u64 blkg_prfill_rwstat(struct seq_file *sf, void *pdata, int off)
+/**
+ * blkg_prfill_rwstat - prfill callback for blkg_rwstat
+ * @sf: seq_file to print to
+ * @pdata: policy private data of interest
+ * @off: offset to the blkg_rwstat in @pdata
+ *
+ * prfill callback for printing a blkg_rwstat.
+ */
+u64 blkg_prfill_rwstat(struct seq_file *sf, void *pdata, int off)
 {
         struct blkg_rwstat rwstat = blkg_rwstat_read(pdata + off);
 
         return __blkg_prfill_rwstat(sf, pdata, &rwstat);
 }
-
-/* print blkg_stat specified by BLKCG_STAT_PRIV() */
-int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft,
-                     struct seq_file *sf)
-{
-        struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
-
-        blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat,
-                          BLKCG_STAT_POL(cft->private),
-                          BLKCG_STAT_OFF(cft->private), false);
-        return 0;
-}
-EXPORT_SYMBOL_GPL(blkcg_print_stat);
-
-/* print blkg_rwstat specified by BLKCG_STAT_PRIV() */
-int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
-                       struct seq_file *sf)
-{
-        struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
-
-        blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat,
-                          BLKCG_STAT_POL(cft->private),
-                          BLKCG_STAT_OFF(cft->private), true);
-        return 0;
-}
-EXPORT_SYMBOL_GPL(blkcg_print_rwstat);
+EXPORT_SYMBOL_GPL(blkg_prfill_rwstat);
 
 /**
  * blkg_conf_prep - parse and prepare for per-blkg config update