ffs_flushfiles
error = ffs_flushfiles(mp, flags);
int ffs_flushfiles(struct mount *, int);
if ((error = ffs_flushfiles(oldmnt, flags)) != 0) {
if ((error = ffs_flushfiles(oldmnt, flags)) != 0)
error = ffs_flushfiles(mp, flags);
if ((error = ffs_flushfiles(mp, flags)) != 0)