+ /*
+ * index:
+ * 0: raid10
+ * 1: raid1
+ * 2: dup
+ * 3: raid0
+ * 4: single
+ */
+ index = get_block_group_index(block_group);
+ if (index == 0) {
+ dev_min = 4;
+ min_free /= 2;
+ } else if (index == 1) {
+ dev_min = 2;
+ } else if (index == 2) {
+ min_free *= 2;
+ } else if (index == 3) {
+ dev_min = fs_devices->rw_devices;
+ min_free /= dev_min;
+ }
+