STOP_CP_REASON_SHUTDOWN
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
bool shutdown = reason == STOP_CP_REASON_SHUTDOWN;