__wait_all_discard_cmd
static unsigned int __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
__wait_all_discard_cmd(sbi, dpolicy);
__wait_all_discard_cmd(sbi, NULL);
__wait_all_discard_cmd(sbi, NULL);
__wait_all_discard_cmd(sbi, &dpolicy);
trimmed += __wait_all_discard_cmd(sbi, NULL);