diff --git a/pageserver/src/basebackup.rs b/pageserver/src/basebackup.rs
index 426e413521..739b63c0c9 100644
--- a/pageserver/src/basebackup.rs
+++ b/pageserver/src/basebackup.rs
@@ -1,12 +1,9 @@
 use crate::ZTimelineId;
 use log::*;
-use postgres_ffi::FilePathError;
 use std::io::Write;
 use tar::Builder;
 use walkdir::WalkDir;
 
-use crate::ZTimelineId;
-
 use postgres_ffi::relfile_utils::*;
 use zenith_utils::lsn::Lsn;
 
diff --git a/pageserver/src/restore_local_repo.rs b/pageserver/src/restore_local_repo.rs
index 5646929998..57cefb7c01 100644
--- a/pageserver/src/restore_local_repo.rs
+++ b/pageserver/src/restore_local_repo.rs
@@ -29,7 +29,6 @@ use crate::ZTimelineId;
 use postgres_ffi::pg_constants;
 use postgres_ffi::relfile_utils::*;
 use postgres_ffi::xlog_utils::*;
-use postgres_ffi::FilePathError;
 use zenith_utils::lsn::Lsn;
 
 ///
diff --git a/postgres_ffi/src/lib.rs b/postgres_ffi/src/lib.rs
index 67e8e4b1b2..a1a12a901d 100644
--- a/postgres_ffi/src/lib.rs
+++ b/postgres_ffi/src/lib.rs
@@ -8,8 +8,6 @@ pub mod relfile_utils;
 pub mod xlog_utils;
 
 use bytes::{Buf, Bytes, BytesMut};
-use std::error::Error;
-use std::fmt;
 
 // sizeof(ControlFileData)
 const SIZEOF_CONTROLDATA: usize = std::mem::size_of::<ControlFileData>();
@@ -52,50 +50,6 @@ pub fn decode_pg_control(mut buf: Bytes) -> Result<ControlFileData, anyhow::Erro
     Ok(controlfile)
 }
 
-#[derive(Debug, Clone)]
-pub struct FilePathError {
-    msg: String,
-}
-
-impl Error for FilePathError {
-    fn description(&self) -> &str {
-        &self.msg
-    }
-}
-
-impl FilePathError {
-    pub fn new(msg: &str) -> FilePathError {
-        FilePathError {
-            msg: msg.to_string(),
-        }
-    }
-}
-
-impl From<core::num::ParseIntError> for FilePathError {
-    fn from(e: core::num::ParseIntError) -> Self {
-        return FilePathError {
-            msg: format!("invalid filename: {}", e),
-        };
-    }
-}
-
-impl fmt::Display for FilePathError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "invalid filename")
-    }
-}
-
-pub fn forkname_to_forknum(forkname: Option<&str>) -> Result<u8, FilePathError> {
-    match forkname {
-        // "main" is not in filenames, it's implicit if the fork name is not present
-        None => Ok(pg_constants::MAIN_FORKNUM),
-        Some("fsm") => Ok(pg_constants::FSM_FORKNUM),
-        Some("vm") => Ok(pg_constants::VISIBILITYMAP_FORKNUM),
-        Some("init") => Ok(pg_constants::INIT_FORKNUM),
-        Some(_) => Err(FilePathError::new("invalid forkname")),
-    }
-}
-
 pub fn encode_pg_control(controlfile: ControlFileData) -> Bytes {
     let b: [u8; SIZEOF_CONTROLDATA];
 
diff --git a/postgres_ffi/src/pg_constants.rs b/postgres_ffi/src/pg_constants.rs
index 5adb09ab9c..b336371373 100644
--- a/postgres_ffi/src/pg_constants.rs
+++ b/postgres_ffi/src/pg_constants.rs
@@ -76,7 +76,6 @@ pub const XACT_XINFO_HAS_TWOPHASE: u32 = 1u32 << 4;
 // From pg_control.h and rmgrlist.h
 pub const XLOG_SWITCH: u8 = 0x40;
 pub const XLOG_SMGR_TRUNCATE: u8 = 0x20;
-pub const SMGR_TRUNCATE_HEAP: u32 = 0x0001;
 
 // From heapam_xlog.h
 pub const XLOG_HEAP_INSERT: u8 = 0x00;
diff --git a/postgres_ffi/src/relfile_utils.rs b/postgres_ffi/src/relfile_utils.rs
index fdfee8108b..4995dcbd2c 100644
--- a/postgres_ffi/src/relfile_utils.rs
+++ b/postgres_ffi/src/relfile_utils.rs
@@ -2,6 +2,7 @@
 /// Common utilities for dealing with PostgreSQL relation files.
 ///
 use regex::Regex;
+use crate::pg_constants;
 
 #[derive(Debug, Clone, thiserror::Error, PartialEq)]
 pub enum FilePathError {
@@ -21,10 +22,10 @@ impl From<core::num::ParseIntError> for FilePathError {
 pub fn forkname_to_number(forkname: Option<&str>) -> Result<u8, FilePathError> {
     match forkname {
         // "main" is not in filenames, it's implicit if the fork name is not present
-        None => Ok(0),
-        Some("fsm") => Ok(1),
-        Some("vm") => Ok(2),
-        Some("init") => Ok(3),
+        None => Ok(pg_constants::MAIN_FORKNUM),
+        Some("fsm") => Ok(pg_constants::FSM_FORKNUM),
+        Some("vm") => Ok(pg_constants::VISIBILITYMAP_FORKNUM),
+        Some("init") => Ok(pg_constants::INIT_FORKNUM),
         Some(_) => Err(FilePathError::InvalidForkName),
     }
 }
@@ -32,10 +33,10 @@ pub fn forkname_to_number(forkname: Option<&str>) -> Result<u8, FilePathError> {
 /// Convert Postgres fork number to the right suffix of the relation data file.
 pub fn forknumber_to_name(forknum: u8) -> Option<&'static str> {
     match forknum {
-        0 => None,
-        1 => Some("fsm"),
-        2 => Some("vm"),
-        3 => Some("init"),
+        pg_constants::MAIN_FORKNUM => None,
+        pg_constants::FSM_FORKNUM => Some("fsm"),
+        pg_constants::VISIBILITYMAP_FORKNUM => Some("vm"),
+        pg_constants::INIT_FORKNUM => Some("init"),
         _ => panic!("unrecognized fork number"),
     }
 }