MAX_FREE_NIDS
if (nm_i->nid_cnt[FREE_NID] >= MAX_FREE_NIDS)
if (nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
while (nr_shrink && nm_i->nid_cnt[FREE_NID] > MAX_FREE_NIDS) {
nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
f2fs_try_to_free_nids(sbi, MAX_FREE_NIDS);
long count = NM_I(sbi)->nid_cnt[FREE_NID] - MAX_FREE_NIDS;