rb_insert_color(&cfqg->rb_node, &st->rb);
}
+/*
+ * This has to be called only on activation of cfqg
+ */
static void
cfq_update_group_weight(struct cfq_group *cfqg)
{
- BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
-
if (cfqg->new_weight) {
cfqg->weight = cfqg->new_weight;
cfqg->new_weight = 0;
}
+}
+
+static void
+cfq_update_group_leaf_weight(struct cfq_group *cfqg)
+{
+ BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
if (cfqg->new_leaf_weight) {
cfqg->leaf_weight = cfqg->new_leaf_weight;
/* add to the service tree */
BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
- cfq_update_group_weight(cfqg);
+ /*
+ * Update leaf_weight. We cannot update weight at this point
+ * because cfqg might already have been activated and is
+ * contributing its current weight to the parent's child_weight.
+ */
+ cfq_update_group_leaf_weight(cfqg);
__cfq_group_service_tree_add(st, cfqg);
/*
*/
while ((parent = cfqg_parent(pos))) {
if (propagate) {
+ cfq_update_group_weight(pos);
propagate = !parent->nr_active++;
parent->children_weight += pos->weight;
}
return 0;
}
-static int __cfqg_set_weight_device(struct cgroup_subsys_state *css,
- struct cftype *cft, const char *buf,
- bool is_leaf_weight)
+static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off,
+ bool is_leaf_weight)
{
- struct blkcg *blkcg = css_to_blkcg(css);
+ struct blkcg *blkcg = css_to_blkcg(of_css(of));
struct blkg_conf_ctx ctx;
struct cfq_group *cfqg;
int ret;
}
blkg_conf_finish(&ctx);
- return ret;
+ return ret ?: nbytes;
}
-static int cfqg_set_weight_device(struct cgroup_subsys_state *css,
- struct cftype *cft, char *buf)
+static ssize_t cfqg_set_weight_device(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
{
- return __cfqg_set_weight_device(css, cft, buf, false);
+ return __cfqg_set_weight_device(of, buf, nbytes, off, false);
}
-static int cfqg_set_leaf_weight_device(struct cgroup_subsys_state *css,
- struct cftype *cft, char *buf)
+static ssize_t cfqg_set_leaf_weight_device(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
{
- return __cfqg_set_weight_device(css, cft, buf, true);
+ return __cfqg_set_weight_device(of, buf, nbytes, off, true);
}
static int __cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft,
.name = "weight_device",
.flags = CFTYPE_ONLY_ON_ROOT,
.seq_show = cfqg_print_leaf_weight_device,
- .write_string = cfqg_set_leaf_weight_device,
+ .write = cfqg_set_leaf_weight_device,
},
{
.name = "weight",
.name = "weight_device",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cfqg_print_weight_device,
- .write_string = cfqg_set_weight_device,
+ .write = cfqg_set_weight_device,
},
{
.name = "weight",
{
.name = "leaf_weight_device",
.seq_show = cfqg_print_leaf_weight_device,
- .write_string = cfqg_set_leaf_weight_device,
+ .write = cfqg_set_leaf_weight_device,
},
{
.name = "leaf_weight",