alinux: block-throttle: code cleanup

This patch does the code cleanup because the seq_show handlers for tg
counters are the same. No functional changes.
Signed-off-by: NJiufei Xue <jiufei.xue@linux.alibaba.com>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

block/blk-throttle.c

@@ -1597,31 +1597,7 @@ static u64 tg_prfill_rwstat_field(struct seq_file *sf,
 	return __blkg_prfill_rwstat(sf, pd, &rwstat);
 }
 
-static int tg_print_service_time(struct seq_file *sf, void *v)
-{
-	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
-			  tg_prfill_rwstat_field, &blkcg_policy_throtl,
-			  seq_cft(sf)->private, true);
-	return 0;
-}
-
-static int tg_print_wait_time(struct seq_file *sf, void *v)
-{
-	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
-			  tg_prfill_rwstat_field, &blkcg_policy_throtl,
-			  seq_cft(sf)->private, true);
-	return 0;
-}
-
-static int tg_print_total_bytes_queued(struct seq_file *sf, void *v)
-{
-	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
-			  tg_prfill_rwstat_field, &blkcg_policy_throtl,
-			  seq_cft(sf)->private, true);
-	return 0;
-}
-
-static int tg_print_total_io_queued(struct seq_file *sf, void *v)
+static int tg_print_rwstat(struct seq_file *sf, void *v)
 {
 	blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)),
 			  tg_prfill_rwstat_field, &blkcg_policy_throtl,
@@ -1677,22 +1653,22 @@ static struct cftype throtl_legacy_files[] = {
 	{
 		.name = "throttle.io_service_time",
 		.private = offsetof(struct throtl_grp, service_time),
-		.seq_show = tg_print_service_time,
+		.seq_show = tg_print_rwstat,
 	},
 	{
 		.name = "throttle.io_wait_time",
 		.private = offsetof(struct throtl_grp, wait_time),
-		.seq_show = tg_print_wait_time,
+		.seq_show = tg_print_rwstat,
 	},
 	{
 		.name = "throttle.total_bytes_queued",
 		.private = offsetof(struct throtl_grp, total_bytes_queued),
-		.seq_show = tg_print_total_bytes_queued,
+		.seq_show = tg_print_rwstat,
 	},
 	{
 		.name = "throttle.total_io_queued",
 		.private = offsetof(struct throtl_grp, total_io_queued),
-		.seq_show = tg_print_total_io_queued,
+		.seq_show = tg_print_rwstat,
 	},
 	{ }	/* terminate */
 };