udf_current_aext
err = udf_current_aext(inode, epos, &cp_loc, &cp_len, &cp_type, 0);
ret = udf_current_aext(inode, epos, eloc, elen,
while ((ret = udf_current_aext(inode, &epos, &eloc,
extern int udf_current_aext(struct inode *inode, struct extent_position *epos,