f2fs_issue_discard_timeout
bool f2fs_issue_discard_timeout(struct f2fs_sb_info *sbi, bool need_check);
f2fs_issue_discard_timeout(sbi, true);
done = f2fs_issue_discard_timeout(sbi, true);
f2fs_issue_discard_timeout(sbi, true);
f2fs_issue_discard_timeout(sbi, flags & SB_RDONLY);