disk_next
for (d = storage_disk_first(a->s); d != NULL; d = disk_next(d))
for (d = storage_disk_first(a->s); d != NULL; d = disk_next(d)) {
for (d = storage_disk_first(a->s); d != NULL; d = disk_next(d)) {
struct disk *disk_next(const struct disk *);
for (d = storage_disk_first(a->s); d != NULL; d = disk_next(d)) {