blkcg: drop blkiocg_file_write_u64()

blkiocg_file_write_u64() has single switch case.  Drop
blkiocg_file_write_u64(), rename blkio_weight_write() to
blkcg_set_weight() and use it directly for .write_u64 callback.

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

1 files changed, 7 insertions, 28 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 951e7f3a8c8..13cae77e8bf 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1207,8 +1207,9 @@ static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft,
         return 0;
 }
 
-static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val)
+static int blkcg_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
 {
+        struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
         struct blkio_group *blkg;
         struct hlist_node *n;
 
@@ -1220,10 +1221,11 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val)
         blkcg->weight = (unsigned int)val;
 
         hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
-                struct blkg_policy_data *pd = blkg->pd[plid];
+                struct blkg_policy_data *pd = blkg->pd[BLKIO_POLICY_PROP];
 
-                if (!pd->conf.weight)
-                        blkio_update_group_weight(blkg, plid, blkcg->weight);
+                if (pd && !pd->conf.weight)
+                        blkio_update_group_weight(blkg, BLKIO_POLICY_PROP,
+                                                  blkcg->weight);
         }
 
         spin_unlock_irq(&blkcg->lock);
@@ -1251,29 +1253,6 @@ static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) {
         return 0;
 }
 
-static int
-blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
-{
-        struct blkio_cgroup *blkcg;
-        enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
-        int name = BLKIOFILE_ATTR(cft->private);
-
-        blkcg = cgroup_to_blkio_cgroup(cgrp);
-
-        switch(plid) {
-        case BLKIO_POLICY_PROP:
-                switch(name) {
-                case BLKIO_PROP_weight:
-                        return blkio_weight_write(blkcg, plid, val);
-                }
-                break;
-        default:
-                BUG();
-        }
-
-        return 0;
-}
-
 struct cftype blkio_files[] = {
         {
                 .name = "weight_device",
@@ -1288,7 +1267,7 @@ struct cftype blkio_files[] = {
                 .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
                                 BLKIO_PROP_weight),
                 .read_u64 = blkiocg_file_read_u64,
-                .write_u64 = blkiocg_file_write_u64,
+                .write_u64 = blkcg_set_weight,
         },
         {
                 .name = "time",