get_ssr_segment
static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
if (get_ssr_segment(sbi, type, alloc_mode, age)) {
if (!f2fs_need_SSR(sbi) || !get_ssr_segment(sbi, type, SSR, 0))
if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type, SSR, 0))